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--- old/usr/src/uts/common/vm/seg_vn.c
+++ new/usr/src/uts/common/vm/seg_vn.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 1986, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright 2015, Joyent, Inc. All rights reserved.
24 24 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
25 25 */
26 26
27 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 28 /* All Rights Reserved */
29 29
30 30 /*
31 31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 32 * The Regents of the University of California
33 33 * All Rights Reserved
34 34 *
35 35 * University Acknowledgment- Portions of this document are derived from
36 36 * software developed by the University of California, Berkeley, and its
37 37 * contributors.
38 38 */
39 39
40 40 /*
41 41 * VM - shared or copy-on-write from a vnode/anonymous memory.
42 42 */
43 43
44 44 #include <sys/types.h>
45 45 #include <sys/param.h>
46 46 #include <sys/t_lock.h>
47 47 #include <sys/errno.h>
48 48 #include <sys/systm.h>
49 49 #include <sys/mman.h>
50 50 #include <sys/debug.h>
51 51 #include <sys/cred.h>
52 52 #include <sys/vmsystm.h>
53 53 #include <sys/tuneable.h>
54 54 #include <sys/bitmap.h>
55 55 #include <sys/swap.h>
56 56 #include <sys/kmem.h>
57 57 #include <sys/sysmacros.h>
58 58 #include <sys/vtrace.h>
59 59 #include <sys/cmn_err.h>
60 60 #include <sys/callb.h>
61 61 #include <sys/vm.h>
62 62 #include <sys/dumphdr.h>
63 63 #include <sys/lgrp.h>
64 64
65 65 #include <vm/hat.h>
66 66 #include <vm/as.h>
67 67 #include <vm/seg.h>
68 68 #include <vm/seg_vn.h>
69 69 #include <vm/pvn.h>
70 70 #include <vm/anon.h>
71 71 #include <vm/page.h>
72 72 #include <vm/vpage.h>
73 73 #include <sys/proc.h>
74 74 #include <sys/task.h>
75 75 #include <sys/project.h>
76 76 #include <sys/zone.h>
77 77 #include <sys/shm_impl.h>
78 78
79 79 /*
80 80 * segvn_fault needs a temporary page list array. To avoid calling kmem all
81 81 * the time, it creates a small (PVN_GETPAGE_NUM entry) array and uses it if
82 82 * it can. In the rare case when this page list is not large enough, it
83 83 * goes and gets a large enough array from kmem.
84 84 *
85 85 * This small page list array covers either 8 pages or 64kB worth of pages -
86 86 * whichever is smaller.
87 87 */
88 88 #define PVN_MAX_GETPAGE_SZ 0x10000
89 89 #define PVN_MAX_GETPAGE_NUM 0x8
90 90
91 91 #if PVN_MAX_GETPAGE_SZ > PVN_MAX_GETPAGE_NUM * PAGESIZE
92 92 #define PVN_GETPAGE_SZ ptob(PVN_MAX_GETPAGE_NUM)
93 93 #define PVN_GETPAGE_NUM PVN_MAX_GETPAGE_NUM
94 94 #else
95 95 #define PVN_GETPAGE_SZ PVN_MAX_GETPAGE_SZ
96 96 #define PVN_GETPAGE_NUM btop(PVN_MAX_GETPAGE_SZ)
97 97 #endif
98 98
99 99 /*
100 100 * Private seg op routines.
101 101 */
102 102 static int segvn_dup(struct seg *seg, struct seg *newseg);
103 103 static int segvn_unmap(struct seg *seg, caddr_t addr, size_t len);
104 104 static void segvn_free(struct seg *seg);
105 105 static faultcode_t segvn_fault(struct hat *hat, struct seg *seg,
106 106 caddr_t addr, size_t len, enum fault_type type,
107 107 enum seg_rw rw);
108 108 static faultcode_t segvn_faulta(struct seg *seg, caddr_t addr);
109 109 static int segvn_setprot(struct seg *seg, caddr_t addr,
110 110 size_t len, uint_t prot);
111 111 static int segvn_checkprot(struct seg *seg, caddr_t addr,
112 112 size_t len, uint_t prot);
113 113 static int segvn_kluster(struct seg *seg, caddr_t addr, ssize_t delta);
114 114 static int segvn_sync(struct seg *seg, caddr_t addr, size_t len,
115 115 int attr, uint_t flags);
116 116 static size_t segvn_incore(struct seg *seg, caddr_t addr, size_t len,
117 117 char *vec);
118 118 static int segvn_lockop(struct seg *seg, caddr_t addr, size_t len,
119 119 int attr, int op, ulong_t *lockmap, size_t pos);
120 120 static int segvn_getprot(struct seg *seg, caddr_t addr, size_t len,
121 121 uint_t *protv);
122 122 static u_offset_t segvn_getoffset(struct seg *seg, caddr_t addr);
123 123 static int segvn_gettype(struct seg *seg, caddr_t addr);
124 124 static int segvn_getvp(struct seg *seg, caddr_t addr,
125 125 struct vnode **vpp);
126 126 static int segvn_advise(struct seg *seg, caddr_t addr, size_t len,
127 127 uint_t behav);
128 128 static void segvn_dump(struct seg *seg);
129 129 static int segvn_pagelock(struct seg *seg, caddr_t addr, size_t len,
130 130 struct page ***ppp, enum lock_type type, enum seg_rw rw);
131 131 static int segvn_setpagesize(struct seg *seg, caddr_t addr, size_t len,
132 132 uint_t szc);
133 133 static int segvn_getmemid(struct seg *seg, caddr_t addr,
134 134 memid_t *memidp);
135 135 static lgrp_mem_policy_info_t *segvn_getpolicy(struct seg *, caddr_t);
136 136 static int segvn_capable(struct seg *seg, segcapability_t capable);
137 137 static int segvn_inherit(struct seg *, caddr_t, size_t, uint_t);
138 138
139 139 struct seg_ops segvn_ops = {
140 140 .dup = segvn_dup,
141 141 .unmap = segvn_unmap,
142 142 .free = segvn_free,
143 143 .fault = segvn_fault,
144 144 .faulta = segvn_faulta,
145 145 .setprot = segvn_setprot,
146 146 .checkprot = segvn_checkprot,
147 147 .kluster = segvn_kluster,
148 148 .sync = segvn_sync,
149 149 .incore = segvn_incore,
150 150 .lockop = segvn_lockop,
151 151 .getprot = segvn_getprot,
152 152 .getoffset = segvn_getoffset,
153 153 .gettype = segvn_gettype,
154 154 .getvp = segvn_getvp,
155 155 .advise = segvn_advise,
156 156 .dump = segvn_dump,
157 157 .pagelock = segvn_pagelock,
158 158 .setpagesize = segvn_setpagesize,
159 159 .getmemid = segvn_getmemid,
160 160 .getpolicy = segvn_getpolicy,
161 161 .capable = segvn_capable,
162 162 .inherit = segvn_inherit,
163 163 };
164 164
165 165 /*
166 166 * Common zfod structures, provided as a shorthand for others to use.
167 167 */
168 168 static segvn_crargs_t zfod_segvn_crargs =
169 169 SEGVN_ZFOD_ARGS(PROT_ZFOD, PROT_ALL);
170 170 static segvn_crargs_t kzfod_segvn_crargs =
171 171 SEGVN_ZFOD_ARGS(PROT_ZFOD & ~PROT_USER,
172 172 PROT_ALL & ~PROT_USER);
173 173 static segvn_crargs_t stack_noexec_crargs =
174 174 SEGVN_ZFOD_ARGS(PROT_ZFOD & ~PROT_EXEC, PROT_ALL);
175 175
176 176 caddr_t zfod_argsp = (caddr_t)&zfod_segvn_crargs; /* user zfod argsp */
177 177 caddr_t kzfod_argsp = (caddr_t)&kzfod_segvn_crargs; /* kernel zfod argsp */
178 178 caddr_t stack_exec_argsp = (caddr_t)&zfod_segvn_crargs; /* executable stack */
179 179 caddr_t stack_noexec_argsp = (caddr_t)&stack_noexec_crargs; /* noexec stack */
180 180
181 181 #define vpgtob(n) ((n) * sizeof (struct vpage)) /* For brevity */
182 182
183 183 size_t segvn_comb_thrshld = UINT_MAX; /* patchable -- see 1196681 */
184 184
185 185 size_t segvn_pglock_comb_thrshld = (1UL << 16); /* 64K */
186 186 size_t segvn_pglock_comb_balign = (1UL << 16); /* 64K */
187 187 uint_t segvn_pglock_comb_bshift;
188 188 size_t segvn_pglock_comb_palign;
189 189
190 190 static int segvn_concat(struct seg *, struct seg *, int);
191 191 static int segvn_extend_prev(struct seg *, struct seg *,
192 192 struct segvn_crargs *, size_t);
193 193 static int segvn_extend_next(struct seg *, struct seg *,
194 194 struct segvn_crargs *, size_t);
195 195 static void segvn_softunlock(struct seg *, caddr_t, size_t, enum seg_rw);
196 196 static void segvn_pagelist_rele(page_t **);
197 197 static void segvn_setvnode_mpss(vnode_t *);
198 198 static void segvn_relocate_pages(page_t **, page_t *);
199 199 static int segvn_full_szcpages(page_t **, uint_t, int *, uint_t *);
200 200 static int segvn_fill_vp_pages(struct segvn_data *, vnode_t *, u_offset_t,
201 201 uint_t, page_t **, page_t **, uint_t *, int *);
202 202 static faultcode_t segvn_fault_vnodepages(struct hat *, struct seg *, caddr_t,
203 203 caddr_t, enum fault_type, enum seg_rw, caddr_t, caddr_t, int);
204 204 static faultcode_t segvn_fault_anonpages(struct hat *, struct seg *, caddr_t,
205 205 caddr_t, enum fault_type, enum seg_rw, caddr_t, caddr_t, int);
206 206 static faultcode_t segvn_faultpage(struct hat *, struct seg *, caddr_t,
207 207 u_offset_t, struct vpage *, page_t **, uint_t,
208 208 enum fault_type, enum seg_rw, int);
209 209 static void segvn_vpage(struct seg *);
210 210 static size_t segvn_count_swap_by_vpages(struct seg *);
211 211
212 212 static void segvn_purge(struct seg *seg);
213 213 static int segvn_reclaim(void *, caddr_t, size_t, struct page **,
214 214 enum seg_rw, int);
215 215 static int shamp_reclaim(void *, caddr_t, size_t, struct page **,
216 216 enum seg_rw, int);
217 217
218 218 static int sameprot(struct seg *, caddr_t, size_t);
219 219
220 220 static int segvn_demote_range(struct seg *, caddr_t, size_t, int, uint_t);
221 221 static int segvn_clrszc(struct seg *);
222 222 static struct seg *segvn_split_seg(struct seg *, caddr_t);
223 223 static int segvn_claim_pages(struct seg *, struct vpage *, u_offset_t,
224 224 ulong_t, uint_t);
225 225
226 226 static void segvn_hat_rgn_unload_callback(caddr_t, caddr_t, caddr_t,
227 227 size_t, void *, u_offset_t);
228 228
229 229 static struct kmem_cache *segvn_cache;
230 230 static struct kmem_cache **segvn_szc_cache;
231 231
232 232 #ifdef VM_STATS
233 233 static struct segvnvmstats_str {
234 234 ulong_t fill_vp_pages[31];
235 235 ulong_t fltvnpages[49];
236 236 ulong_t fullszcpages[10];
237 237 ulong_t relocatepages[3];
238 238 ulong_t fltanpages[17];
239 239 ulong_t pagelock[2];
240 240 ulong_t demoterange[3];
241 241 } segvnvmstats;
242 242 #endif /* VM_STATS */
243 243
244 244 #define SDR_RANGE 1 /* demote entire range */
245 245 #define SDR_END 2 /* demote non aligned ends only */
246 246
247 247 #define CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr) { \
248 248 if ((len) != 0) { \
249 249 lpgaddr = (caddr_t)P2ALIGN((uintptr_t)(addr), pgsz); \
250 250 ASSERT(lpgaddr >= (seg)->s_base); \
251 251 lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)((addr) + \
252 252 (len)), pgsz); \
253 253 ASSERT(lpgeaddr > lpgaddr); \
254 254 ASSERT(lpgeaddr <= (seg)->s_base + (seg)->s_size); \
255 255 } else { \
256 256 lpgeaddr = lpgaddr = (addr); \
257 257 } \
258 258 }
259 259
260 260 /*ARGSUSED*/
261 261 static int
262 262 segvn_cache_constructor(void *buf, void *cdrarg, int kmflags)
263 263 {
264 264 struct segvn_data *svd = buf;
265 265
266 266 rw_init(&svd->lock, NULL, RW_DEFAULT, NULL);
267 267 mutex_init(&svd->segfree_syncmtx, NULL, MUTEX_DEFAULT, NULL);
268 268 svd->svn_trnext = svd->svn_trprev = NULL;
269 269 return (0);
270 270 }
271 271
272 272 /*ARGSUSED1*/
273 273 static void
274 274 segvn_cache_destructor(void *buf, void *cdrarg)
275 275 {
276 276 struct segvn_data *svd = buf;
277 277
278 278 rw_destroy(&svd->lock);
279 279 mutex_destroy(&svd->segfree_syncmtx);
280 280 }
281 281
282 282 /*ARGSUSED*/
283 283 static int
284 284 svntr_cache_constructor(void *buf, void *cdrarg, int kmflags)
285 285 {
286 286 bzero(buf, sizeof (svntr_t));
287 287 return (0);
288 288 }
289 289
290 290 /*
291 291 * Patching this variable to non-zero allows the system to run with
292 292 * stacks marked as "not executable". It's a bit of a kludge, but is
293 293 * provided as a tweakable for platforms that export those ABIs
294 294 * (e.g. sparc V8) that have executable stacks enabled by default.
295 295 * There are also some restrictions for platforms that don't actually
296 296 * implement 'noexec' protections.
297 297 *
298 298 * Once enabled, the system is (therefore) unable to provide a fully
299 299 * ABI-compliant execution environment, though practically speaking,
300 300 * most everything works. The exceptions are generally some interpreters
301 301 * and debuggers that create executable code on the stack and jump
302 302 * into it (without explicitly mprotecting the address range to include
303 303 * PROT_EXEC).
304 304 *
305 305 * One important class of applications that are disabled are those
306 306 * that have been transformed into malicious agents using one of the
307 307 * numerous "buffer overflow" attacks. See 4007890.
308 308 */
309 309 int noexec_user_stack = 0;
310 310 int noexec_user_stack_log = 1;
311 311
312 312 int segvn_lpg_disable = 0;
313 313 uint_t segvn_maxpgszc = 0;
314 314
315 315 ulong_t segvn_vmpss_clrszc_cnt;
316 316 ulong_t segvn_vmpss_clrszc_err;
317 317 ulong_t segvn_fltvnpages_clrszc_cnt;
318 318 ulong_t segvn_fltvnpages_clrszc_err;
319 319 ulong_t segvn_setpgsz_align_err;
320 320 ulong_t segvn_setpgsz_anon_align_err;
321 321 ulong_t segvn_setpgsz_getattr_err;
322 322 ulong_t segvn_setpgsz_eof_err;
323 323 ulong_t segvn_faultvnmpss_align_err1;
324 324 ulong_t segvn_faultvnmpss_align_err2;
325 325 ulong_t segvn_faultvnmpss_align_err3;
326 326 ulong_t segvn_faultvnmpss_align_err4;
327 327 ulong_t segvn_faultvnmpss_align_err5;
328 328 ulong_t segvn_vmpss_pageio_deadlk_err;
329 329
330 330 int segvn_use_regions = 1;
331 331
332 332 /*
333 333 * Segvn supports text replication optimization for NUMA platforms. Text
334 334 * replica's are represented by anon maps (amp). There's one amp per text file
335 335 * region per lgroup. A process chooses the amp for each of its text mappings
336 336 * based on the lgroup assignment of its main thread (t_tid = 1). All
337 337 * processes that want a replica on a particular lgroup for the same text file
338 338 * mapping share the same amp. amp's are looked up in svntr_hashtab hash table
339 339 * with vp,off,size,szc used as a key. Text replication segments are read only
340 340 * MAP_PRIVATE|MAP_TEXT segments that map vnode. Replication is achieved by
341 341 * forcing COW faults from vnode to amp and mapping amp pages instead of vnode
342 342 * pages. Replication amp is assigned to a segment when it gets its first
343 343 * pagefault. To handle main thread lgroup rehoming segvn_trasync_thread
344 344 * rechecks periodically if the process still maps an amp local to the main
345 345 * thread. If not async thread forces process to remap to an amp in the new
346 346 * home lgroup of the main thread. Current text replication implementation
347 347 * only provides the benefit to workloads that do most of their work in the
348 348 * main thread of a process or all the threads of a process run in the same
349 349 * lgroup. To extend text replication benefit to different types of
350 350 * multithreaded workloads further work would be needed in the hat layer to
351 351 * allow the same virtual address in the same hat to simultaneously map
352 352 * different physical addresses (i.e. page table replication would be needed
353 353 * for x86).
354 354 *
355 355 * amp pages are used instead of vnode pages as long as segment has a very
356 356 * simple life cycle. It's created via segvn_create(), handles S_EXEC
357 357 * (S_READ) pagefaults and is fully unmapped. If anything more complicated
358 358 * happens such as protection is changed, real COW fault happens, pagesize is
359 359 * changed, MC_LOCK is requested or segment is partially unmapped we turn off
360 360 * text replication by converting the segment back to vnode only segment
361 361 * (unmap segment's address range and set svd->amp to NULL).
362 362 *
363 363 * The original file can be changed after amp is inserted into
364 364 * svntr_hashtab. Processes that are launched after the file is already
365 365 * changed can't use the replica's created prior to the file change. To
366 366 * implement this functionality hash entries are timestamped. Replica's can
367 367 * only be used if current file modification time is the same as the timestamp
368 368 * saved when hash entry was created. However just timestamps alone are not
369 369 * sufficient to detect file modification via mmap(MAP_SHARED) mappings. We
370 370 * deal with file changes via MAP_SHARED mappings differently. When writable
371 371 * MAP_SHARED mappings are created to vnodes marked as executable we mark all
372 372 * existing replica's for this vnode as not usable for future text
373 373 * mappings. And we don't create new replica's for files that currently have
374 374 * potentially writable MAP_SHARED mappings (i.e. vn_is_mapped(V_WRITE) is
375 375 * true).
376 376 */
377 377
378 378 #define SEGVN_TEXTREPL_MAXBYTES_FACTOR (20)
379 379 size_t segvn_textrepl_max_bytes_factor = SEGVN_TEXTREPL_MAXBYTES_FACTOR;
380 380
381 381 static ulong_t svntr_hashtab_sz = 512;
382 382 static svntr_bucket_t *svntr_hashtab = NULL;
383 383 static struct kmem_cache *svntr_cache;
384 384 static svntr_stats_t *segvn_textrepl_stats;
385 385 static ksema_t segvn_trasync_sem;
386 386
387 387 int segvn_disable_textrepl = 1;
388 388 size_t textrepl_size_thresh = (size_t)-1;
389 389 size_t segvn_textrepl_bytes = 0;
390 390 size_t segvn_textrepl_max_bytes = 0;
391 391 clock_t segvn_update_textrepl_interval = 0;
392 392 int segvn_update_tr_time = 10;
393 393 int segvn_disable_textrepl_update = 0;
394 394
395 395 static void segvn_textrepl(struct seg *);
396 396 static void segvn_textunrepl(struct seg *, int);
397 397 static void segvn_inval_trcache(vnode_t *);
398 398 static void segvn_trasync_thread(void);
399 399 static void segvn_trupdate_wakeup(void *);
400 400 static void segvn_trupdate(void);
401 401 static void segvn_trupdate_seg(struct seg *, segvn_data_t *, svntr_t *,
402 402 ulong_t);
403 403
404 404 /*
405 405 * Initialize segvn data structures
406 406 */
407 407 void
408 408 segvn_init(void)
409 409 {
410 410 uint_t maxszc;
411 411 uint_t szc;
412 412 size_t pgsz;
413 413
414 414 segvn_cache = kmem_cache_create("segvn_cache",
415 415 sizeof (struct segvn_data), 0,
416 416 segvn_cache_constructor, segvn_cache_destructor, NULL,
417 417 NULL, NULL, 0);
418 418
419 419 if (segvn_lpg_disable == 0) {
420 420 szc = maxszc = page_num_pagesizes() - 1;
421 421 if (szc == 0) {
422 422 segvn_lpg_disable = 1;
423 423 }
424 424 if (page_get_pagesize(0) != PAGESIZE) {
425 425 panic("segvn_init: bad szc 0");
426 426 /*NOTREACHED*/
427 427 }
428 428 while (szc != 0) {
429 429 pgsz = page_get_pagesize(szc);
430 430 if (pgsz <= PAGESIZE || !IS_P2ALIGNED(pgsz, pgsz)) {
431 431 panic("segvn_init: bad szc %d", szc);
432 432 /*NOTREACHED*/
433 433 }
434 434 szc--;
435 435 }
436 436 if (segvn_maxpgszc == 0 || segvn_maxpgszc > maxszc)
437 437 segvn_maxpgszc = maxszc;
438 438 }
439 439
440 440 if (segvn_maxpgszc) {
441 441 segvn_szc_cache = (struct kmem_cache **)kmem_alloc(
442 442 (segvn_maxpgszc + 1) * sizeof (struct kmem_cache *),
443 443 KM_SLEEP);
444 444 }
445 445
446 446 for (szc = 1; szc <= segvn_maxpgszc; szc++) {
447 447 char str[32];
448 448
449 449 (void) sprintf(str, "segvn_szc_cache%d", szc);
450 450 segvn_szc_cache[szc] = kmem_cache_create(str,
451 451 page_get_pagecnt(szc) * sizeof (page_t *), 0,
452 452 NULL, NULL, NULL, NULL, NULL, KMC_NODEBUG);
453 453 }
454 454
455 455
456 456 if (segvn_use_regions && !hat_supported(HAT_SHARED_REGIONS, NULL))
457 457 segvn_use_regions = 0;
458 458
459 459 /*
460 460 * For now shared regions and text replication segvn support
461 461 * are mutually exclusive. This is acceptable because
462 462 * currently significant benefit from text replication was
463 463 * only observed on AMD64 NUMA platforms (due to relatively
464 464 * small L2$ size) and currently we don't support shared
465 465 * regions on x86.
466 466 */
467 467 if (segvn_use_regions && !segvn_disable_textrepl) {
468 468 segvn_disable_textrepl = 1;
469 469 }
470 470
471 471 #if defined(_LP64)
472 472 if (lgrp_optimizations() && textrepl_size_thresh != (size_t)-1 &&
473 473 !segvn_disable_textrepl) {
474 474 ulong_t i;
475 475 size_t hsz = svntr_hashtab_sz * sizeof (svntr_bucket_t);
476 476
477 477 svntr_cache = kmem_cache_create("svntr_cache",
478 478 sizeof (svntr_t), 0, svntr_cache_constructor, NULL,
479 479 NULL, NULL, NULL, 0);
480 480 svntr_hashtab = kmem_zalloc(hsz, KM_SLEEP);
481 481 for (i = 0; i < svntr_hashtab_sz; i++) {
482 482 mutex_init(&svntr_hashtab[i].tr_lock, NULL,
483 483 MUTEX_DEFAULT, NULL);
484 484 }
485 485 segvn_textrepl_max_bytes = ptob(physmem) /
486 486 segvn_textrepl_max_bytes_factor;
487 487 segvn_textrepl_stats = kmem_zalloc(NCPU *
488 488 sizeof (svntr_stats_t), KM_SLEEP);
489 489 sema_init(&segvn_trasync_sem, 0, NULL, SEMA_DEFAULT, NULL);
490 490 (void) thread_create(NULL, 0, segvn_trasync_thread,
491 491 NULL, 0, &p0, TS_RUN, minclsyspri);
492 492 }
493 493 #endif
494 494
495 495 if (!ISP2(segvn_pglock_comb_balign) ||
496 496 segvn_pglock_comb_balign < PAGESIZE) {
497 497 segvn_pglock_comb_balign = 1UL << 16; /* 64K */
498 498 }
499 499 segvn_pglock_comb_bshift = highbit(segvn_pglock_comb_balign) - 1;
500 500 segvn_pglock_comb_palign = btop(segvn_pglock_comb_balign);
501 501 }
502 502
503 503 #define SEGVN_PAGEIO ((void *)0x1)
504 504 #define SEGVN_NOPAGEIO ((void *)0x2)
505 505
506 506 static void
507 507 segvn_setvnode_mpss(vnode_t *vp)
508 508 {
509 509 int err;
510 510
511 511 ASSERT(vp->v_mpssdata == NULL ||
512 512 vp->v_mpssdata == SEGVN_PAGEIO ||
513 513 vp->v_mpssdata == SEGVN_NOPAGEIO);
514 514
515 515 if (vp->v_mpssdata == NULL) {
516 516 if (vn_vmpss_usepageio(vp)) {
517 517 err = VOP_PAGEIO(vp, (page_t *)NULL,
518 518 (u_offset_t)0, 0, 0, CRED(), NULL);
519 519 } else {
520 520 err = ENOSYS;
521 521 }
522 522 /*
523 523 * set v_mpssdata just once per vnode life
524 524 * so that it never changes.
525 525 */
526 526 mutex_enter(&vp->v_lock);
527 527 if (vp->v_mpssdata == NULL) {
528 528 if (err == EINVAL) {
529 529 vp->v_mpssdata = SEGVN_PAGEIO;
530 530 } else {
531 531 vp->v_mpssdata = SEGVN_NOPAGEIO;
532 532 }
533 533 }
534 534 mutex_exit(&vp->v_lock);
535 535 }
536 536 }
537 537
538 538 int
539 539 segvn_create(struct seg *seg, void *argsp)
540 540 {
541 541 struct segvn_crargs *a = (struct segvn_crargs *)argsp;
542 542 struct segvn_data *svd;
543 543 size_t swresv = 0;
544 544 struct cred *cred;
545 545 struct anon_map *amp;
546 546 int error = 0;
547 547 size_t pgsz;
548 548 lgrp_mem_policy_t mpolicy = LGRP_MEM_POLICY_DEFAULT;
549 549 int use_rgn = 0;
550 550 int trok = 0;
551 551
552 552 ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
553 553
554 554 if (a->type != MAP_PRIVATE && a->type != MAP_SHARED) {
555 555 panic("segvn_create type");
556 556 /*NOTREACHED*/
557 557 }
558 558
559 559 /*
560 560 * Check arguments. If a shared anon structure is given then
561 561 * it is illegal to also specify a vp.
562 562 */
563 563 if (a->amp != NULL && a->vp != NULL) {
564 564 panic("segvn_create anon_map");
565 565 /*NOTREACHED*/
566 566 }
567 567
568 568 if (a->type == MAP_PRIVATE && (a->flags & MAP_TEXT) &&
569 569 a->vp != NULL && a->prot == (PROT_USER | PROT_READ | PROT_EXEC) &&
570 570 segvn_use_regions) {
571 571 use_rgn = 1;
572 572 }
573 573
574 574 /* MAP_NORESERVE on a MAP_SHARED segment is meaningless. */
575 575 if (a->type == MAP_SHARED)
576 576 a->flags &= ~MAP_NORESERVE;
577 577
578 578 if (a->szc != 0) {
579 579 if (segvn_lpg_disable != 0 || (a->szc == AS_MAP_NO_LPOOB) ||
580 580 (a->amp != NULL && a->type == MAP_PRIVATE) ||
581 581 (a->flags & MAP_NORESERVE) || seg->s_as == &kas) {
582 582 a->szc = 0;
583 583 } else {
584 584 if (a->szc > segvn_maxpgszc)
585 585 a->szc = segvn_maxpgszc;
586 586 pgsz = page_get_pagesize(a->szc);
587 587 if (!IS_P2ALIGNED(seg->s_base, pgsz) ||
588 588 !IS_P2ALIGNED(seg->s_size, pgsz)) {
589 589 a->szc = 0;
590 590 } else if (a->vp != NULL) {
591 591 if (IS_SWAPFSVP(a->vp) || VN_ISKAS(a->vp)) {
592 592 /*
593 593 * paranoid check.
594 594 * hat_page_demote() is not supported
595 595 * on swapfs pages.
596 596 */
597 597 a->szc = 0;
598 598 } else if (map_addr_vacalign_check(seg->s_base,
599 599 a->offset & PAGEMASK)) {
600 600 a->szc = 0;
601 601 }
602 602 } else if (a->amp != NULL) {
603 603 pgcnt_t anum = btopr(a->offset);
604 604 pgcnt_t pgcnt = page_get_pagecnt(a->szc);
605 605 if (!IS_P2ALIGNED(anum, pgcnt)) {
606 606 a->szc = 0;
607 607 }
608 608 }
609 609 }
610 610 }
611 611
612 612 /*
613 613 * If segment may need private pages, reserve them now.
614 614 */
615 615 if (!(a->flags & MAP_NORESERVE) && ((a->vp == NULL && a->amp == NULL) ||
616 616 (a->type == MAP_PRIVATE && (a->prot & PROT_WRITE)))) {
617 617 if (anon_resv_zone(seg->s_size,
618 618 seg->s_as->a_proc->p_zone) == 0)
619 619 return (EAGAIN);
620 620 swresv = seg->s_size;
621 621 TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u",
622 622 seg, swresv, 1);
623 623 }
624 624
625 625 /*
626 626 * Reserve any mapping structures that may be required.
627 627 *
628 628 * Don't do it for segments that may use regions. It's currently a
629 629 * noop in the hat implementations anyway.
630 630 */
631 631 if (!use_rgn) {
632 632 hat_map(seg->s_as->a_hat, seg->s_base, seg->s_size, HAT_MAP);
633 633 }
634 634
635 635 if (a->cred) {
636 636 cred = a->cred;
637 637 crhold(cred);
638 638 } else {
639 639 crhold(cred = CRED());
640 640 }
641 641
642 642 /* Inform the vnode of the new mapping */
643 643 if (a->vp != NULL) {
644 644 error = VOP_ADDMAP(a->vp, a->offset & PAGEMASK,
645 645 seg->s_as, seg->s_base, seg->s_size, a->prot,
646 646 a->maxprot, a->type, cred, NULL);
647 647 if (error) {
648 648 if (swresv != 0) {
649 649 anon_unresv_zone(swresv,
650 650 seg->s_as->a_proc->p_zone);
651 651 TRACE_3(TR_FAC_VM, TR_ANON_PROC,
652 652 "anon proc:%p %lu %u", seg, swresv, 0);
653 653 }
654 654 crfree(cred);
655 655 if (!use_rgn) {
656 656 hat_unload(seg->s_as->a_hat, seg->s_base,
657 657 seg->s_size, HAT_UNLOAD_UNMAP);
658 658 }
659 659 return (error);
660 660 }
661 661 /*
662 662 * svntr_hashtab will be NULL if we support shared regions.
663 663 */
664 664 trok = ((a->flags & MAP_TEXT) &&
665 665 (seg->s_size > textrepl_size_thresh ||
666 666 (a->flags & _MAP_TEXTREPL)) &&
667 667 lgrp_optimizations() && svntr_hashtab != NULL &&
668 668 a->type == MAP_PRIVATE && swresv == 0 &&
669 669 !(a->flags & MAP_NORESERVE) &&
670 670 seg->s_as != &kas && a->vp->v_type == VREG);
671 671
672 672 ASSERT(!trok || !use_rgn);
673 673 }
674 674
675 675 /*
676 676 * MAP_NORESERVE mappings don't count towards the VSZ of a process
677 677 * until we fault the pages in.
678 678 */
679 679 if ((a->vp == NULL || a->vp->v_type != VREG) &&
680 680 a->flags & MAP_NORESERVE) {
681 681 seg->s_as->a_resvsize -= seg->s_size;
682 682 }
683 683
684 684 /*
685 685 * If more than one segment in the address space, and they're adjacent
686 686 * virtually, try to concatenate them. Don't concatenate if an
687 687 * explicit anon_map structure was supplied (e.g., SystemV shared
688 688 * memory) or if we'll use text replication for this segment.
689 689 */
690 690 if (a->amp == NULL && !use_rgn && !trok) {
691 691 struct seg *pseg, *nseg;
692 692 struct segvn_data *psvd, *nsvd;
693 693 lgrp_mem_policy_t ppolicy, npolicy;
694 694 uint_t lgrp_mem_policy_flags = 0;
695 695 extern lgrp_mem_policy_t lgrp_mem_default_policy;
696 696
697 697 /*
698 698 * Memory policy flags (lgrp_mem_policy_flags) is valid when
699 699 * extending stack/heap segments.
700 700 */
701 701 if ((a->vp == NULL) && (a->type == MAP_PRIVATE) &&
702 702 !(a->flags & MAP_NORESERVE) && (seg->s_as != &kas)) {
703 703 lgrp_mem_policy_flags = a->lgrp_mem_policy_flags;
704 704 } else {
705 705 /*
706 706 * Get policy when not extending it from another segment
707 707 */
708 708 mpolicy = lgrp_mem_policy_default(seg->s_size, a->type);
709 709 }
710 710
711 711 /*
712 712 * First, try to concatenate the previous and new segments
713 713 */
714 714 pseg = AS_SEGPREV(seg->s_as, seg);
715 715 if (pseg != NULL &&
716 716 pseg->s_base + pseg->s_size == seg->s_base &&
717 717 pseg->s_ops == &segvn_ops) {
718 718 /*
719 719 * Get memory allocation policy from previous segment.
720 720 * When extension is specified (e.g. for heap) apply
721 721 * this policy to the new segment regardless of the
722 722 * outcome of segment concatenation. Extension occurs
723 723 * for non-default policy otherwise default policy is
724 724 * used and is based on extended segment size.
725 725 */
726 726 psvd = (struct segvn_data *)pseg->s_data;
727 727 ppolicy = psvd->policy_info.mem_policy;
728 728 if (lgrp_mem_policy_flags ==
729 729 LGRP_MP_FLAG_EXTEND_UP) {
730 730 if (ppolicy != lgrp_mem_default_policy) {
731 731 mpolicy = ppolicy;
732 732 } else {
733 733 mpolicy = lgrp_mem_policy_default(
734 734 pseg->s_size + seg->s_size,
735 735 a->type);
736 736 }
737 737 }
738 738
739 739 if (mpolicy == ppolicy &&
740 740 (pseg->s_size + seg->s_size <=
741 741 segvn_comb_thrshld || psvd->amp == NULL) &&
742 742 segvn_extend_prev(pseg, seg, a, swresv) == 0) {
743 743 /*
744 744 * success! now try to concatenate
745 745 * with following seg
746 746 */
747 747 crfree(cred);
748 748 nseg = AS_SEGNEXT(pseg->s_as, pseg);
749 749 if (nseg != NULL &&
750 750 nseg != pseg &&
751 751 nseg->s_ops == &segvn_ops &&
752 752 pseg->s_base + pseg->s_size ==
753 753 nseg->s_base)
754 754 (void) segvn_concat(pseg, nseg, 0);
755 755 ASSERT(pseg->s_szc == 0 ||
756 756 (a->szc == pseg->s_szc &&
757 757 IS_P2ALIGNED(pseg->s_base, pgsz) &&
758 758 IS_P2ALIGNED(pseg->s_size, pgsz)));
759 759 return (0);
760 760 }
761 761 }
762 762
763 763 /*
764 764 * Failed, so try to concatenate with following seg
765 765 */
766 766 nseg = AS_SEGNEXT(seg->s_as, seg);
767 767 if (nseg != NULL &&
768 768 seg->s_base + seg->s_size == nseg->s_base &&
769 769 nseg->s_ops == &segvn_ops) {
770 770 /*
771 771 * Get memory allocation policy from next segment.
772 772 * When extension is specified (e.g. for stack) apply
773 773 * this policy to the new segment regardless of the
774 774 * outcome of segment concatenation. Extension occurs
775 775 * for non-default policy otherwise default policy is
776 776 * used and is based on extended segment size.
777 777 */
778 778 nsvd = (struct segvn_data *)nseg->s_data;
779 779 npolicy = nsvd->policy_info.mem_policy;
780 780 if (lgrp_mem_policy_flags ==
781 781 LGRP_MP_FLAG_EXTEND_DOWN) {
782 782 if (npolicy != lgrp_mem_default_policy) {
783 783 mpolicy = npolicy;
784 784 } else {
785 785 mpolicy = lgrp_mem_policy_default(
786 786 nseg->s_size + seg->s_size,
787 787 a->type);
788 788 }
789 789 }
790 790
791 791 if (mpolicy == npolicy &&
792 792 segvn_extend_next(seg, nseg, a, swresv) == 0) {
793 793 crfree(cred);
794 794 ASSERT(nseg->s_szc == 0 ||
795 795 (a->szc == nseg->s_szc &&
796 796 IS_P2ALIGNED(nseg->s_base, pgsz) &&
797 797 IS_P2ALIGNED(nseg->s_size, pgsz)));
798 798 return (0);
799 799 }
800 800 }
801 801 }
802 802
803 803 if (a->vp != NULL) {
804 804 VN_HOLD(a->vp);
805 805 if (a->type == MAP_SHARED)
806 806 lgrp_shm_policy_init(NULL, a->vp);
807 807 }
808 808 svd = kmem_cache_alloc(segvn_cache, KM_SLEEP);
809 809
810 810 seg->s_ops = &segvn_ops;
811 811 seg->s_data = (void *)svd;
812 812 seg->s_szc = a->szc;
813 813
814 814 svd->seg = seg;
815 815 svd->vp = a->vp;
816 816 /*
817 817 * Anonymous mappings have no backing file so the offset is meaningless.
818 818 */
819 819 svd->offset = a->vp ? (a->offset & PAGEMASK) : 0;
820 820 svd->prot = a->prot;
821 821 svd->maxprot = a->maxprot;
822 822 svd->pageprot = 0;
823 823 svd->type = a->type;
824 824 svd->vpage = NULL;
825 825 svd->cred = cred;
826 826 svd->advice = MADV_NORMAL;
827 827 svd->pageadvice = 0;
828 828 svd->flags = (ushort_t)a->flags;
829 829 svd->softlockcnt = 0;
830 830 svd->softlockcnt_sbase = 0;
831 831 svd->softlockcnt_send = 0;
832 832 svd->svn_inz = 0;
833 833 svd->rcookie = HAT_INVALID_REGION_COOKIE;
834 834 svd->pageswap = 0;
835 835
836 836 if (a->szc != 0 && a->vp != NULL) {
837 837 segvn_setvnode_mpss(a->vp);
838 838 }
839 839 if (svd->type == MAP_SHARED && svd->vp != NULL &&
840 840 (svd->vp->v_flag & VVMEXEC) && (svd->prot & PROT_WRITE)) {
841 841 ASSERT(vn_is_mapped(svd->vp, V_WRITE));
842 842 segvn_inval_trcache(svd->vp);
843 843 }
844 844
845 845 amp = a->amp;
846 846 if ((svd->amp = amp) == NULL) {
847 847 svd->anon_index = 0;
848 848 if (svd->type == MAP_SHARED) {
849 849 svd->swresv = 0;
850 850 /*
851 851 * Shared mappings to a vp need no other setup.
852 852 * If we have a shared mapping to an anon_map object
853 853 * which hasn't been allocated yet, allocate the
854 854 * struct now so that it will be properly shared
855 855 * by remembering the swap reservation there.
856 856 */
857 857 if (a->vp == NULL) {
858 858 svd->amp = anonmap_alloc(seg->s_size, swresv,
859 859 ANON_SLEEP);
860 860 svd->amp->a_szc = seg->s_szc;
861 861 }
862 862 } else {
863 863 /*
864 864 * Private mapping (with or without a vp).
865 865 * Allocate anon_map when needed.
866 866 */
867 867 svd->swresv = swresv;
868 868 }
869 869 } else {
870 870 pgcnt_t anon_num;
871 871
872 872 /*
873 873 * Mapping to an existing anon_map structure without a vp.
874 874 * For now we will insure that the segment size isn't larger
875 875 * than the size - offset gives us. Later on we may wish to
876 876 * have the anon array dynamically allocated itself so that
877 877 * we don't always have to allocate all the anon pointer slots.
878 878 * This of course involves adding extra code to check that we
879 879 * aren't trying to use an anon pointer slot beyond the end
880 880 * of the currently allocated anon array.
881 881 */
882 882 if ((amp->size - a->offset) < seg->s_size) {
883 883 panic("segvn_create anon_map size");
884 884 /*NOTREACHED*/
885 885 }
886 886
887 887 anon_num = btopr(a->offset);
888 888
889 889 if (a->type == MAP_SHARED) {
890 890 /*
891 891 * SHARED mapping to a given anon_map.
892 892 */
893 893 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
894 894 amp->refcnt++;
895 895 if (a->szc > amp->a_szc) {
896 896 amp->a_szc = a->szc;
897 897 }
898 898 ANON_LOCK_EXIT(&->a_rwlock);
899 899 svd->anon_index = anon_num;
900 900 svd->swresv = 0;
901 901 } else {
902 902 /*
903 903 * PRIVATE mapping to a given anon_map.
904 904 * Make sure that all the needed anon
905 905 * structures are created (so that we will
906 906 * share the underlying pages if nothing
907 907 * is written by this mapping) and then
908 908 * duplicate the anon array as is done
909 909 * when a privately mapped segment is dup'ed.
910 910 */
911 911 struct anon *ap;
912 912 caddr_t addr;
913 913 caddr_t eaddr;
914 914 ulong_t anon_idx;
915 915 int hat_flag = HAT_LOAD;
916 916
917 917 if (svd->flags & MAP_TEXT) {
918 918 hat_flag |= HAT_LOAD_TEXT;
919 919 }
920 920
921 921 svd->amp = anonmap_alloc(seg->s_size, 0, ANON_SLEEP);
922 922 svd->amp->a_szc = seg->s_szc;
923 923 svd->anon_index = 0;
924 924 svd->swresv = swresv;
925 925
926 926 /*
927 927 * Prevent 2 threads from allocating anon
928 928 * slots simultaneously.
929 929 */
930 930 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
931 931 eaddr = seg->s_base + seg->s_size;
932 932
933 933 for (anon_idx = anon_num, addr = seg->s_base;
934 934 addr < eaddr; addr += PAGESIZE, anon_idx++) {
935 935 page_t *pp;
936 936
937 937 if ((ap = anon_get_ptr(amp->ahp,
938 938 anon_idx)) != NULL)
939 939 continue;
940 940
941 941 /*
942 942 * Allocate the anon struct now.
943 943 * Might as well load up translation
944 944 * to the page while we're at it...
945 945 */
946 946 pp = anon_zero(seg, addr, &ap, cred);
947 947 if (ap == NULL || pp == NULL) {
948 948 panic("segvn_create anon_zero");
949 949 /*NOTREACHED*/
950 950 }
951 951
952 952 /*
953 953 * Re-acquire the anon_map lock and
954 954 * initialize the anon array entry.
955 955 */
956 956 ASSERT(anon_get_ptr(amp->ahp,
957 957 anon_idx) == NULL);
958 958 (void) anon_set_ptr(amp->ahp, anon_idx, ap,
959 959 ANON_SLEEP);
960 960
961 961 ASSERT(seg->s_szc == 0);
962 962 ASSERT(!IS_VMODSORT(pp->p_vnode));
963 963
964 964 ASSERT(use_rgn == 0);
965 965 hat_memload(seg->s_as->a_hat, addr, pp,
966 966 svd->prot & ~PROT_WRITE, hat_flag);
967 967
968 968 page_unlock(pp);
969 969 }
970 970 ASSERT(seg->s_szc == 0);
971 971 anon_dup(amp->ahp, anon_num, svd->amp->ahp,
972 972 0, seg->s_size);
973 973 ANON_LOCK_EXIT(&->a_rwlock);
974 974 }
975 975 }
976 976
977 977 /*
978 978 * Set default memory allocation policy for segment
979 979 *
980 980 * Always set policy for private memory at least for initialization
981 981 * even if this is a shared memory segment
982 982 */
983 983 (void) lgrp_privm_policy_set(mpolicy, &svd->policy_info, seg->s_size);
984 984
985 985 if (svd->type == MAP_SHARED)
986 986 (void) lgrp_shm_policy_set(mpolicy, svd->amp, svd->anon_index,
987 987 svd->vp, svd->offset, seg->s_size);
988 988
989 989 if (use_rgn) {
990 990 ASSERT(!trok);
991 991 ASSERT(svd->amp == NULL);
992 992 svd->rcookie = hat_join_region(seg->s_as->a_hat, seg->s_base,
993 993 seg->s_size, (void *)svd->vp, svd->offset, svd->prot,
994 994 (uchar_t)seg->s_szc, segvn_hat_rgn_unload_callback,
995 995 HAT_REGION_TEXT);
996 996 }
997 997
998 998 ASSERT(!trok || !(svd->prot & PROT_WRITE));
999 999 svd->tr_state = trok ? SEGVN_TR_INIT : SEGVN_TR_OFF;
1000 1000
1001 1001 return (0);
1002 1002 }
1003 1003
1004 1004 /*
1005 1005 * Concatenate two existing segments, if possible.
1006 1006 * Return 0 on success, -1 if two segments are not compatible
1007 1007 * or -2 on memory allocation failure.
1008 1008 * If amp_cat == 1 then try and concat segments with anon maps
1009 1009 */
1010 1010 static int
1011 1011 segvn_concat(struct seg *seg1, struct seg *seg2, int amp_cat)
1012 1012 {
1013 1013 struct segvn_data *svd1 = seg1->s_data;
1014 1014 struct segvn_data *svd2 = seg2->s_data;
1015 1015 struct anon_map *amp1 = svd1->amp;
1016 1016 struct anon_map *amp2 = svd2->amp;
1017 1017 struct vpage *vpage1 = svd1->vpage;
1018 1018 struct vpage *vpage2 = svd2->vpage, *nvpage = NULL;
1019 1019 size_t size, nvpsize;
1020 1020 pgcnt_t npages1, npages2;
1021 1021
1022 1022 ASSERT(seg1->s_as && seg2->s_as && seg1->s_as == seg2->s_as);
1023 1023 ASSERT(AS_WRITE_HELD(seg1->s_as, &seg1->s_as->a_lock));
1024 1024 ASSERT(seg1->s_ops == seg2->s_ops);
1025 1025
1026 1026 if (HAT_IS_REGION_COOKIE_VALID(svd1->rcookie) ||
1027 1027 HAT_IS_REGION_COOKIE_VALID(svd2->rcookie)) {
1028 1028 return (-1);
1029 1029 }
1030 1030
1031 1031 /* both segments exist, try to merge them */
1032 1032 #define incompat(x) (svd1->x != svd2->x)
1033 1033 if (incompat(vp) || incompat(maxprot) ||
1034 1034 (!svd1->pageadvice && !svd2->pageadvice && incompat(advice)) ||
1035 1035 (!svd1->pageprot && !svd2->pageprot && incompat(prot)) ||
1036 1036 incompat(type) || incompat(cred) || incompat(flags) ||
1037 1037 seg1->s_szc != seg2->s_szc || incompat(policy_info.mem_policy) ||
1038 1038 (svd2->softlockcnt > 0) || svd1->softlockcnt_send > 0)
1039 1039 return (-1);
1040 1040 #undef incompat
1041 1041
1042 1042 /*
1043 1043 * vp == NULL implies zfod, offset doesn't matter
1044 1044 */
1045 1045 if (svd1->vp != NULL &&
1046 1046 svd1->offset + seg1->s_size != svd2->offset) {
1047 1047 return (-1);
1048 1048 }
1049 1049
1050 1050 /*
1051 1051 * Don't concatenate if either segment uses text replication.
1052 1052 */
1053 1053 if (svd1->tr_state != SEGVN_TR_OFF || svd2->tr_state != SEGVN_TR_OFF) {
1054 1054 return (-1);
1055 1055 }
1056 1056
1057 1057 /*
1058 1058 * Fail early if we're not supposed to concatenate
1059 1059 * segments with non NULL amp.
1060 1060 */
1061 1061 if (amp_cat == 0 && (amp1 != NULL || amp2 != NULL)) {
1062 1062 return (-1);
1063 1063 }
1064 1064
1065 1065 if (svd1->vp == NULL && svd1->type == MAP_SHARED) {
1066 1066 if (amp1 != amp2) {
1067 1067 return (-1);
1068 1068 }
1069 1069 if (amp1 != NULL && svd1->anon_index + btop(seg1->s_size) !=
1070 1070 svd2->anon_index) {
1071 1071 return (-1);
1072 1072 }
1073 1073 ASSERT(amp1 == NULL || amp1->refcnt >= 2);
1074 1074 }
1075 1075
1076 1076 /*
1077 1077 * If either seg has vpages, create a new merged vpage array.
1078 1078 */
1079 1079 if (vpage1 != NULL || vpage2 != NULL) {
1080 1080 struct vpage *vp, *evp;
1081 1081
1082 1082 npages1 = seg_pages(seg1);
1083 1083 npages2 = seg_pages(seg2);
1084 1084 nvpsize = vpgtob(npages1 + npages2);
1085 1085
1086 1086 if ((nvpage = kmem_zalloc(nvpsize, KM_NOSLEEP)) == NULL) {
1087 1087 return (-2);
1088 1088 }
1089 1089
1090 1090 if (vpage1 != NULL) {
1091 1091 bcopy(vpage1, nvpage, vpgtob(npages1));
1092 1092 } else {
1093 1093 evp = nvpage + npages1;
1094 1094 for (vp = nvpage; vp < evp; vp++) {
1095 1095 VPP_SETPROT(vp, svd1->prot);
1096 1096 VPP_SETADVICE(vp, svd1->advice);
1097 1097 }
1098 1098 }
1099 1099
1100 1100 if (vpage2 != NULL) {
1101 1101 bcopy(vpage2, nvpage + npages1, vpgtob(npages2));
1102 1102 } else {
1103 1103 evp = nvpage + npages1 + npages2;
1104 1104 for (vp = nvpage + npages1; vp < evp; vp++) {
1105 1105 VPP_SETPROT(vp, svd2->prot);
1106 1106 VPP_SETADVICE(vp, svd2->advice);
1107 1107 }
1108 1108 }
1109 1109
1110 1110 if (svd2->pageswap && (!svd1->pageswap && svd1->swresv)) {
1111 1111 ASSERT(svd1->swresv == seg1->s_size);
1112 1112 ASSERT(!(svd1->flags & MAP_NORESERVE));
1113 1113 ASSERT(!(svd2->flags & MAP_NORESERVE));
1114 1114 evp = nvpage + npages1;
1115 1115 for (vp = nvpage; vp < evp; vp++) {
1116 1116 VPP_SETSWAPRES(vp);
1117 1117 }
1118 1118 }
1119 1119
1120 1120 if (svd1->pageswap && (!svd2->pageswap && svd2->swresv)) {
1121 1121 ASSERT(svd2->swresv == seg2->s_size);
1122 1122 ASSERT(!(svd1->flags & MAP_NORESERVE));
1123 1123 ASSERT(!(svd2->flags & MAP_NORESERVE));
1124 1124 vp = nvpage + npages1;
1125 1125 evp = vp + npages2;
1126 1126 for (; vp < evp; vp++) {
1127 1127 VPP_SETSWAPRES(vp);
1128 1128 }
1129 1129 }
1130 1130 }
1131 1131 ASSERT((vpage1 != NULL || vpage2 != NULL) ||
1132 1132 (svd1->pageswap == 0 && svd2->pageswap == 0));
1133 1133
1134 1134 /*
1135 1135 * If either segment has private pages, create a new merged anon
1136 1136 * array. If mergeing shared anon segments just decrement anon map's
1137 1137 * refcnt.
1138 1138 */
1139 1139 if (amp1 != NULL && svd1->type == MAP_SHARED) {
1140 1140 ASSERT(amp1 == amp2 && svd1->vp == NULL);
1141 1141 ANON_LOCK_ENTER(&1->a_rwlock, RW_WRITER);
1142 1142 ASSERT(amp1->refcnt >= 2);
1143 1143 amp1->refcnt--;
1144 1144 ANON_LOCK_EXIT(&1->a_rwlock);
1145 1145 svd2->amp = NULL;
1146 1146 } else if (amp1 != NULL || amp2 != NULL) {
1147 1147 struct anon_hdr *nahp;
1148 1148 struct anon_map *namp = NULL;
1149 1149 size_t asize;
1150 1150
1151 1151 ASSERT(svd1->type == MAP_PRIVATE);
1152 1152
1153 1153 asize = seg1->s_size + seg2->s_size;
1154 1154 if ((nahp = anon_create(btop(asize), ANON_NOSLEEP)) == NULL) {
1155 1155 if (nvpage != NULL) {
1156 1156 kmem_free(nvpage, nvpsize);
1157 1157 }
1158 1158 return (-2);
1159 1159 }
1160 1160 if (amp1 != NULL) {
1161 1161 /*
1162 1162 * XXX anon rwlock is not really needed because
1163 1163 * this is a private segment and we are writers.
1164 1164 */
1165 1165 ANON_LOCK_ENTER(&1->a_rwlock, RW_WRITER);
1166 1166 ASSERT(amp1->refcnt == 1);
1167 1167 if (anon_copy_ptr(amp1->ahp, svd1->anon_index,
1168 1168 nahp, 0, btop(seg1->s_size), ANON_NOSLEEP)) {
1169 1169 anon_release(nahp, btop(asize));
1170 1170 ANON_LOCK_EXIT(&1->a_rwlock);
1171 1171 if (nvpage != NULL) {
1172 1172 kmem_free(nvpage, nvpsize);
1173 1173 }
1174 1174 return (-2);
1175 1175 }
1176 1176 }
1177 1177 if (amp2 != NULL) {
1178 1178 ANON_LOCK_ENTER(&2->a_rwlock, RW_WRITER);
1179 1179 ASSERT(amp2->refcnt == 1);
1180 1180 if (anon_copy_ptr(amp2->ahp, svd2->anon_index,
1181 1181 nahp, btop(seg1->s_size), btop(seg2->s_size),
1182 1182 ANON_NOSLEEP)) {
1183 1183 anon_release(nahp, btop(asize));
1184 1184 ANON_LOCK_EXIT(&2->a_rwlock);
1185 1185 if (amp1 != NULL) {
1186 1186 ANON_LOCK_EXIT(&1->a_rwlock);
1187 1187 }
1188 1188 if (nvpage != NULL) {
1189 1189 kmem_free(nvpage, nvpsize);
1190 1190 }
1191 1191 return (-2);
1192 1192 }
1193 1193 }
1194 1194 if (amp1 != NULL) {
1195 1195 namp = amp1;
1196 1196 anon_release(amp1->ahp, btop(amp1->size));
1197 1197 }
1198 1198 if (amp2 != NULL) {
1199 1199 if (namp == NULL) {
1200 1200 ASSERT(amp1 == NULL);
1201 1201 namp = amp2;
1202 1202 anon_release(amp2->ahp, btop(amp2->size));
1203 1203 } else {
1204 1204 amp2->refcnt--;
1205 1205 ANON_LOCK_EXIT(&2->a_rwlock);
1206 1206 anonmap_free(amp2);
1207 1207 }
1208 1208 svd2->amp = NULL; /* needed for seg_free */
1209 1209 }
1210 1210 namp->ahp = nahp;
1211 1211 namp->size = asize;
1212 1212 svd1->amp = namp;
1213 1213 svd1->anon_index = 0;
1214 1214 ANON_LOCK_EXIT(&namp->a_rwlock);
1215 1215 }
1216 1216 /*
1217 1217 * Now free the old vpage structures.
1218 1218 */
1219 1219 if (nvpage != NULL) {
1220 1220 if (vpage1 != NULL) {
1221 1221 kmem_free(vpage1, vpgtob(npages1));
1222 1222 }
1223 1223 if (vpage2 != NULL) {
1224 1224 svd2->vpage = NULL;
1225 1225 kmem_free(vpage2, vpgtob(npages2));
1226 1226 }
1227 1227 if (svd2->pageprot) {
1228 1228 svd1->pageprot = 1;
1229 1229 }
1230 1230 if (svd2->pageadvice) {
1231 1231 svd1->pageadvice = 1;
1232 1232 }
1233 1233 if (svd2->pageswap) {
1234 1234 svd1->pageswap = 1;
1235 1235 }
1236 1236 svd1->vpage = nvpage;
1237 1237 }
1238 1238
1239 1239 /* all looks ok, merge segments */
1240 1240 svd1->swresv += svd2->swresv;
1241 1241 svd2->swresv = 0; /* so seg_free doesn't release swap space */
1242 1242 size = seg2->s_size;
1243 1243 seg_free(seg2);
1244 1244 seg1->s_size += size;
1245 1245 return (0);
1246 1246 }
1247 1247
1248 1248 /*
1249 1249 * Extend the previous segment (seg1) to include the
1250 1250 * new segment (seg2 + a), if possible.
1251 1251 * Return 0 on success.
1252 1252 */
1253 1253 static int
1254 1254 segvn_extend_prev(seg1, seg2, a, swresv)
1255 1255 struct seg *seg1, *seg2;
1256 1256 struct segvn_crargs *a;
1257 1257 size_t swresv;
1258 1258 {
1259 1259 struct segvn_data *svd1 = (struct segvn_data *)seg1->s_data;
1260 1260 size_t size;
1261 1261 struct anon_map *amp1;
1262 1262 struct vpage *new_vpage;
1263 1263
1264 1264 /*
1265 1265 * We don't need any segment level locks for "segvn" data
1266 1266 * since the address space is "write" locked.
1267 1267 */
1268 1268 ASSERT(seg1->s_as && AS_WRITE_HELD(seg1->s_as, &seg1->s_as->a_lock));
1269 1269
1270 1270 if (HAT_IS_REGION_COOKIE_VALID(svd1->rcookie)) {
1271 1271 return (-1);
1272 1272 }
1273 1273
1274 1274 /* second segment is new, try to extend first */
1275 1275 /* XXX - should also check cred */
1276 1276 if (svd1->vp != a->vp || svd1->maxprot != a->maxprot ||
1277 1277 (!svd1->pageprot && (svd1->prot != a->prot)) ||
1278 1278 svd1->type != a->type || svd1->flags != a->flags ||
1279 1279 seg1->s_szc != a->szc || svd1->softlockcnt_send > 0)
1280 1280 return (-1);
1281 1281
1282 1282 /* vp == NULL implies zfod, offset doesn't matter */
1283 1283 if (svd1->vp != NULL &&
1284 1284 svd1->offset + seg1->s_size != (a->offset & PAGEMASK))
1285 1285 return (-1);
1286 1286
1287 1287 if (svd1->tr_state != SEGVN_TR_OFF) {
1288 1288 return (-1);
1289 1289 }
1290 1290
1291 1291 amp1 = svd1->amp;
1292 1292 if (amp1) {
1293 1293 pgcnt_t newpgs;
1294 1294
1295 1295 /*
1296 1296 * Segment has private pages, can data structures
1297 1297 * be expanded?
1298 1298 *
1299 1299 * Acquire the anon_map lock to prevent it from changing,
1300 1300 * if it is shared. This ensures that the anon_map
1301 1301 * will not change while a thread which has a read/write
1302 1302 * lock on an address space references it.
1303 1303 * XXX - Don't need the anon_map lock at all if "refcnt"
1304 1304 * is 1.
1305 1305 *
1306 1306 * Can't grow a MAP_SHARED segment with an anonmap because
1307 1307 * there may be existing anon slots where we want to extend
1308 1308 * the segment and we wouldn't know what to do with them
1309 1309 * (e.g., for tmpfs right thing is to just leave them there,
1310 1310 * for /dev/zero they should be cleared out).
1311 1311 */
1312 1312 if (svd1->type == MAP_SHARED)
1313 1313 return (-1);
1314 1314
1315 1315 ANON_LOCK_ENTER(&1->a_rwlock, RW_WRITER);
1316 1316 if (amp1->refcnt > 1) {
1317 1317 ANON_LOCK_EXIT(&1->a_rwlock);
1318 1318 return (-1);
1319 1319 }
1320 1320 newpgs = anon_grow(amp1->ahp, &svd1->anon_index,
1321 1321 btop(seg1->s_size), btop(seg2->s_size), ANON_NOSLEEP);
1322 1322
1323 1323 if (newpgs == 0) {
1324 1324 ANON_LOCK_EXIT(&1->a_rwlock);
1325 1325 return (-1);
1326 1326 }
1327 1327 amp1->size = ptob(newpgs);
1328 1328 ANON_LOCK_EXIT(&1->a_rwlock);
1329 1329 }
1330 1330 if (svd1->vpage != NULL) {
1331 1331 struct vpage *vp, *evp;
1332 1332 new_vpage =
1333 1333 kmem_zalloc(vpgtob(seg_pages(seg1) + seg_pages(seg2)),
1334 1334 KM_NOSLEEP);
1335 1335 if (new_vpage == NULL)
1336 1336 return (-1);
1337 1337 bcopy(svd1->vpage, new_vpage, vpgtob(seg_pages(seg1)));
1338 1338 kmem_free(svd1->vpage, vpgtob(seg_pages(seg1)));
1339 1339 svd1->vpage = new_vpage;
1340 1340
1341 1341 vp = new_vpage + seg_pages(seg1);
1342 1342 evp = vp + seg_pages(seg2);
1343 1343 for (; vp < evp; vp++)
1344 1344 VPP_SETPROT(vp, a->prot);
1345 1345 if (svd1->pageswap && swresv) {
1346 1346 ASSERT(!(svd1->flags & MAP_NORESERVE));
1347 1347 ASSERT(swresv == seg2->s_size);
1348 1348 vp = new_vpage + seg_pages(seg1);
1349 1349 for (; vp < evp; vp++) {
1350 1350 VPP_SETSWAPRES(vp);
1351 1351 }
1352 1352 }
1353 1353 }
1354 1354 ASSERT(svd1->vpage != NULL || svd1->pageswap == 0);
1355 1355 size = seg2->s_size;
1356 1356 seg_free(seg2);
1357 1357 seg1->s_size += size;
1358 1358 svd1->swresv += swresv;
1359 1359 if (svd1->pageprot && (a->prot & PROT_WRITE) &&
1360 1360 svd1->type == MAP_SHARED && svd1->vp != NULL &&
1361 1361 (svd1->vp->v_flag & VVMEXEC)) {
1362 1362 ASSERT(vn_is_mapped(svd1->vp, V_WRITE));
1363 1363 segvn_inval_trcache(svd1->vp);
1364 1364 }
1365 1365 return (0);
1366 1366 }
1367 1367
1368 1368 /*
1369 1369 * Extend the next segment (seg2) to include the
1370 1370 * new segment (seg1 + a), if possible.
1371 1371 * Return 0 on success.
1372 1372 */
1373 1373 static int
1374 1374 segvn_extend_next(
1375 1375 struct seg *seg1,
1376 1376 struct seg *seg2,
1377 1377 struct segvn_crargs *a,
1378 1378 size_t swresv)
1379 1379 {
1380 1380 struct segvn_data *svd2 = (struct segvn_data *)seg2->s_data;
1381 1381 size_t size;
1382 1382 struct anon_map *amp2;
1383 1383 struct vpage *new_vpage;
1384 1384
1385 1385 /*
1386 1386 * We don't need any segment level locks for "segvn" data
1387 1387 * since the address space is "write" locked.
1388 1388 */
1389 1389 ASSERT(seg2->s_as && AS_WRITE_HELD(seg2->s_as, &seg2->s_as->a_lock));
1390 1390
1391 1391 if (HAT_IS_REGION_COOKIE_VALID(svd2->rcookie)) {
1392 1392 return (-1);
1393 1393 }
1394 1394
1395 1395 /* first segment is new, try to extend second */
1396 1396 /* XXX - should also check cred */
1397 1397 if (svd2->vp != a->vp || svd2->maxprot != a->maxprot ||
1398 1398 (!svd2->pageprot && (svd2->prot != a->prot)) ||
1399 1399 svd2->type != a->type || svd2->flags != a->flags ||
1400 1400 seg2->s_szc != a->szc || svd2->softlockcnt_sbase > 0)
1401 1401 return (-1);
1402 1402 /* vp == NULL implies zfod, offset doesn't matter */
1403 1403 if (svd2->vp != NULL &&
1404 1404 (a->offset & PAGEMASK) + seg1->s_size != svd2->offset)
1405 1405 return (-1);
1406 1406
1407 1407 if (svd2->tr_state != SEGVN_TR_OFF) {
1408 1408 return (-1);
1409 1409 }
1410 1410
1411 1411 amp2 = svd2->amp;
1412 1412 if (amp2) {
1413 1413 pgcnt_t newpgs;
1414 1414
1415 1415 /*
1416 1416 * Segment has private pages, can data structures
1417 1417 * be expanded?
1418 1418 *
1419 1419 * Acquire the anon_map lock to prevent it from changing,
1420 1420 * if it is shared. This ensures that the anon_map
1421 1421 * will not change while a thread which has a read/write
1422 1422 * lock on an address space references it.
1423 1423 *
1424 1424 * XXX - Don't need the anon_map lock at all if "refcnt"
1425 1425 * is 1.
1426 1426 */
1427 1427 if (svd2->type == MAP_SHARED)
1428 1428 return (-1);
1429 1429
1430 1430 ANON_LOCK_ENTER(&2->a_rwlock, RW_WRITER);
1431 1431 if (amp2->refcnt > 1) {
1432 1432 ANON_LOCK_EXIT(&2->a_rwlock);
1433 1433 return (-1);
1434 1434 }
1435 1435 newpgs = anon_grow(amp2->ahp, &svd2->anon_index,
1436 1436 btop(seg2->s_size), btop(seg1->s_size),
1437 1437 ANON_NOSLEEP | ANON_GROWDOWN);
1438 1438
1439 1439 if (newpgs == 0) {
1440 1440 ANON_LOCK_EXIT(&2->a_rwlock);
1441 1441 return (-1);
1442 1442 }
1443 1443 amp2->size = ptob(newpgs);
1444 1444 ANON_LOCK_EXIT(&2->a_rwlock);
1445 1445 }
1446 1446 if (svd2->vpage != NULL) {
1447 1447 struct vpage *vp, *evp;
1448 1448 new_vpage =
1449 1449 kmem_zalloc(vpgtob(seg_pages(seg1) + seg_pages(seg2)),
1450 1450 KM_NOSLEEP);
1451 1451 if (new_vpage == NULL) {
1452 1452 /* Not merging segments so adjust anon_index back */
1453 1453 if (amp2)
1454 1454 svd2->anon_index += seg_pages(seg1);
1455 1455 return (-1);
1456 1456 }
1457 1457 bcopy(svd2->vpage, new_vpage + seg_pages(seg1),
1458 1458 vpgtob(seg_pages(seg2)));
1459 1459 kmem_free(svd2->vpage, vpgtob(seg_pages(seg2)));
1460 1460 svd2->vpage = new_vpage;
1461 1461
1462 1462 vp = new_vpage;
1463 1463 evp = vp + seg_pages(seg1);
1464 1464 for (; vp < evp; vp++)
1465 1465 VPP_SETPROT(vp, a->prot);
1466 1466 if (svd2->pageswap && swresv) {
1467 1467 ASSERT(!(svd2->flags & MAP_NORESERVE));
1468 1468 ASSERT(swresv == seg1->s_size);
1469 1469 vp = new_vpage;
1470 1470 for (; vp < evp; vp++) {
1471 1471 VPP_SETSWAPRES(vp);
1472 1472 }
1473 1473 }
1474 1474 }
1475 1475 ASSERT(svd2->vpage != NULL || svd2->pageswap == 0);
1476 1476 size = seg1->s_size;
1477 1477 seg_free(seg1);
1478 1478 seg2->s_size += size;
1479 1479 seg2->s_base -= size;
1480 1480 svd2->offset -= size;
1481 1481 svd2->swresv += swresv;
1482 1482 if (svd2->pageprot && (a->prot & PROT_WRITE) &&
1483 1483 svd2->type == MAP_SHARED && svd2->vp != NULL &&
1484 1484 (svd2->vp->v_flag & VVMEXEC)) {
1485 1485 ASSERT(vn_is_mapped(svd2->vp, V_WRITE));
1486 1486 segvn_inval_trcache(svd2->vp);
1487 1487 }
1488 1488 return (0);
1489 1489 }
1490 1490
1491 1491 /*
1492 1492 * Duplicate all the pages in the segment. This may break COW sharing for a
1493 1493 * given page. If the page is marked with inherit zero set, then instead of
1494 1494 * duplicating the page, we zero the page.
1495 1495 */
1496 1496 static int
1497 1497 segvn_dup_pages(struct seg *seg, struct seg *newseg)
1498 1498 {
1499 1499 int error;
1500 1500 uint_t prot;
1501 1501 page_t *pp;
1502 1502 struct anon *ap, *newap;
1503 1503 size_t i;
1504 1504 caddr_t addr;
1505 1505
1506 1506 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
1507 1507 struct segvn_data *newsvd = (struct segvn_data *)newseg->s_data;
1508 1508 ulong_t old_idx = svd->anon_index;
1509 1509 ulong_t new_idx = 0;
1510 1510
1511 1511 i = btopr(seg->s_size);
1512 1512 addr = seg->s_base;
1513 1513
1514 1514 /*
1515 1515 * XXX break cow sharing using PAGESIZE
1516 1516 * pages. They will be relocated into larger
1517 1517 * pages at fault time.
1518 1518 */
1519 1519 while (i-- > 0) {
1520 1520 if ((ap = anon_get_ptr(svd->amp->ahp, old_idx)) != NULL) {
1521 1521 struct vpage *vpp;
1522 1522
1523 1523 vpp = &svd->vpage[seg_page(seg, addr)];
1524 1524
1525 1525 /*
1526 1526 * prot need not be computed below 'cause anon_private
1527 1527 * is going to ignore it anyway as child doesn't inherit
1528 1528 * pagelock from parent.
1529 1529 */
1530 1530 prot = svd->pageprot ? VPP_PROT(vpp) : svd->prot;
1531 1531
1532 1532 /*
1533 1533 * Check whether we should zero this or dup it.
1534 1534 */
1535 1535 if (svd->svn_inz == SEGVN_INZ_ALL ||
1536 1536 (svd->svn_inz == SEGVN_INZ_VPP &&
1537 1537 VPP_ISINHZERO(vpp))) {
1538 1538 pp = anon_zero(newseg, addr, &newap,
1539 1539 newsvd->cred);
1540 1540 } else {
1541 1541 page_t *anon_pl[1+1];
1542 1542 uint_t vpprot;
1543 1543 error = anon_getpage(&ap, &vpprot, anon_pl,
1544 1544 PAGESIZE, seg, addr, S_READ, svd->cred);
1545 1545 if (error != 0)
1546 1546 return (error);
1547 1547
1548 1548 pp = anon_private(&newap, newseg, addr, prot,
1549 1549 anon_pl[0], 0, newsvd->cred);
1550 1550 }
1551 1551 if (pp == NULL) {
1552 1552 return (ENOMEM);
1553 1553 }
1554 1554 (void) anon_set_ptr(newsvd->amp->ahp, new_idx, newap,
1555 1555 ANON_SLEEP);
1556 1556 page_unlock(pp);
1557 1557 }
1558 1558 addr += PAGESIZE;
1559 1559 old_idx++;
1560 1560 new_idx++;
1561 1561 }
1562 1562
1563 1563 return (0);
1564 1564 }
1565 1565
1566 1566 static int
1567 1567 segvn_dup(struct seg *seg, struct seg *newseg)
1568 1568 {
1569 1569 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
1570 1570 struct segvn_data *newsvd;
1571 1571 pgcnt_t npages = seg_pages(seg);
1572 1572 int error = 0;
1573 1573 size_t len;
1574 1574 struct anon_map *amp;
1575 1575
1576 1576 ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
1577 1577 ASSERT(newseg->s_as->a_proc->p_parent == curproc);
1578 1578
1579 1579 /*
1580 1580 * If segment has anon reserved, reserve more for the new seg.
1581 1581 * For a MAP_NORESERVE segment swresv will be a count of all the
1582 1582 * allocated anon slots; thus we reserve for the child as many slots
1583 1583 * as the parent has allocated. This semantic prevents the child or
1584 1584 * parent from dieing during a copy-on-write fault caused by trying
1585 1585 * to write a shared pre-existing anon page.
1586 1586 */
1587 1587 if ((len = svd->swresv) != 0) {
1588 1588 if (anon_resv(svd->swresv) == 0)
1589 1589 return (ENOMEM);
1590 1590
1591 1591 TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u",
1592 1592 seg, len, 0);
1593 1593 }
1594 1594
1595 1595 newsvd = kmem_cache_alloc(segvn_cache, KM_SLEEP);
1596 1596
1597 1597 newseg->s_ops = &segvn_ops;
1598 1598 newseg->s_data = (void *)newsvd;
1599 1599 newseg->s_szc = seg->s_szc;
1600 1600
1601 1601 newsvd->seg = newseg;
1602 1602 if ((newsvd->vp = svd->vp) != NULL) {
1603 1603 VN_HOLD(svd->vp);
1604 1604 if (svd->type == MAP_SHARED)
1605 1605 lgrp_shm_policy_init(NULL, svd->vp);
1606 1606 }
1607 1607 newsvd->offset = svd->offset;
1608 1608 newsvd->prot = svd->prot;
1609 1609 newsvd->maxprot = svd->maxprot;
1610 1610 newsvd->pageprot = svd->pageprot;
1611 1611 newsvd->type = svd->type;
1612 1612 newsvd->cred = svd->cred;
1613 1613 crhold(newsvd->cred);
1614 1614 newsvd->advice = svd->advice;
1615 1615 newsvd->pageadvice = svd->pageadvice;
1616 1616 newsvd->svn_inz = svd->svn_inz;
1617 1617 newsvd->swresv = svd->swresv;
1618 1618 newsvd->pageswap = svd->pageswap;
1619 1619 newsvd->flags = svd->flags;
1620 1620 newsvd->softlockcnt = 0;
1621 1621 newsvd->softlockcnt_sbase = 0;
1622 1622 newsvd->softlockcnt_send = 0;
1623 1623 newsvd->policy_info = svd->policy_info;
1624 1624 newsvd->rcookie = HAT_INVALID_REGION_COOKIE;
1625 1625
1626 1626 if ((amp = svd->amp) == NULL || svd->tr_state == SEGVN_TR_ON) {
1627 1627 /*
1628 1628 * Not attaching to a shared anon object.
1629 1629 */
1630 1630 ASSERT(!HAT_IS_REGION_COOKIE_VALID(svd->rcookie) ||
1631 1631 svd->tr_state == SEGVN_TR_OFF);
1632 1632 if (svd->tr_state == SEGVN_TR_ON) {
1633 1633 ASSERT(newsvd->vp != NULL && amp != NULL);
1634 1634 newsvd->tr_state = SEGVN_TR_INIT;
1635 1635 } else {
1636 1636 newsvd->tr_state = svd->tr_state;
1637 1637 }
1638 1638 newsvd->amp = NULL;
1639 1639 newsvd->anon_index = 0;
1640 1640 } else {
1641 1641 /* regions for now are only used on pure vnode segments */
1642 1642 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
1643 1643 ASSERT(svd->tr_state == SEGVN_TR_OFF);
1644 1644 newsvd->tr_state = SEGVN_TR_OFF;
1645 1645 if (svd->type == MAP_SHARED) {
1646 1646 ASSERT(svd->svn_inz == SEGVN_INZ_NONE);
1647 1647 newsvd->amp = amp;
1648 1648 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
1649 1649 amp->refcnt++;
1650 1650 ANON_LOCK_EXIT(&->a_rwlock);
1651 1651 newsvd->anon_index = svd->anon_index;
1652 1652 } else {
1653 1653 int reclaim = 1;
1654 1654
1655 1655 /*
1656 1656 * Allocate and initialize new anon_map structure.
1657 1657 */
1658 1658 newsvd->amp = anonmap_alloc(newseg->s_size, 0,
1659 1659 ANON_SLEEP);
1660 1660 newsvd->amp->a_szc = newseg->s_szc;
1661 1661 newsvd->anon_index = 0;
1662 1662 ASSERT(svd->svn_inz == SEGVN_INZ_NONE ||
1663 1663 svd->svn_inz == SEGVN_INZ_ALL ||
1664 1664 svd->svn_inz == SEGVN_INZ_VPP);
1665 1665
1666 1666 /*
1667 1667 * We don't have to acquire the anon_map lock
1668 1668 * for the new segment (since it belongs to an
1669 1669 * address space that is still not associated
1670 1670 * with any process), or the segment in the old
1671 1671 * address space (since all threads in it
1672 1672 * are stopped while duplicating the address space).
1673 1673 */
1674 1674
1675 1675 /*
1676 1676 * The goal of the following code is to make sure that
1677 1677 * softlocked pages do not end up as copy on write
1678 1678 * pages. This would cause problems where one
1679 1679 * thread writes to a page that is COW and a different
1680 1680 * thread in the same process has softlocked it. The
1681 1681 * softlock lock would move away from this process
1682 1682 * because the write would cause this process to get
1683 1683 * a copy (without the softlock).
1684 1684 *
1685 1685 * The strategy here is to just break the
1686 1686 * sharing on pages that could possibly be
1687 1687 * softlocked.
1688 1688 *
1689 1689 * In addition, if any pages have been marked that they
1690 1690 * should be inherited as zero, then we immediately go
1691 1691 * ahead and break COW and zero them. In the case of a
1692 1692 * softlocked page that should be inherited zero, we
1693 1693 * break COW and just get a zero page.
1694 1694 */
1695 1695 retry:
1696 1696 if (svd->softlockcnt ||
1697 1697 svd->svn_inz != SEGVN_INZ_NONE) {
1698 1698 /*
1699 1699 * The softlock count might be non zero
1700 1700 * because some pages are still stuck in the
1701 1701 * cache for lazy reclaim. Flush the cache
1702 1702 * now. This should drop the count to zero.
1703 1703 * [or there is really I/O going on to these
1704 1704 * pages]. Note, we have the writers lock so
1705 1705 * nothing gets inserted during the flush.
1706 1706 */
1707 1707 if (svd->softlockcnt && reclaim == 1) {
1708 1708 segvn_purge(seg);
1709 1709 reclaim = 0;
1710 1710 goto retry;
1711 1711 }
1712 1712
1713 1713 error = segvn_dup_pages(seg, newseg);
1714 1714 if (error != 0) {
1715 1715 newsvd->vpage = NULL;
1716 1716 goto out;
1717 1717 }
1718 1718 } else { /* common case */
1719 1719 if (seg->s_szc != 0) {
1720 1720 /*
1721 1721 * If at least one of anon slots of a
1722 1722 * large page exists then make sure
1723 1723 * all anon slots of a large page
1724 1724 * exist to avoid partial cow sharing
1725 1725 * of a large page in the future.
1726 1726 */
1727 1727 anon_dup_fill_holes(amp->ahp,
1728 1728 svd->anon_index, newsvd->amp->ahp,
1729 1729 0, seg->s_size, seg->s_szc,
1730 1730 svd->vp != NULL);
1731 1731 } else {
1732 1732 anon_dup(amp->ahp, svd->anon_index,
1733 1733 newsvd->amp->ahp, 0, seg->s_size);
1734 1734 }
1735 1735
1736 1736 hat_clrattr(seg->s_as->a_hat, seg->s_base,
1737 1737 seg->s_size, PROT_WRITE);
1738 1738 }
1739 1739 }
1740 1740 }
1741 1741 /*
1742 1742 * If necessary, create a vpage structure for the new segment.
1743 1743 * Do not copy any page lock indications.
1744 1744 */
1745 1745 if (svd->vpage != NULL) {
1746 1746 uint_t i;
1747 1747 struct vpage *ovp = svd->vpage;
1748 1748 struct vpage *nvp;
1749 1749
1750 1750 nvp = newsvd->vpage =
1751 1751 kmem_alloc(vpgtob(npages), KM_SLEEP);
1752 1752 for (i = 0; i < npages; i++) {
1753 1753 *nvp = *ovp++;
1754 1754 VPP_CLRPPLOCK(nvp++);
1755 1755 }
1756 1756 } else
1757 1757 newsvd->vpage = NULL;
1758 1758
1759 1759 /* Inform the vnode of the new mapping */
1760 1760 if (newsvd->vp != NULL) {
1761 1761 error = VOP_ADDMAP(newsvd->vp, (offset_t)newsvd->offset,
1762 1762 newseg->s_as, newseg->s_base, newseg->s_size, newsvd->prot,
1763 1763 newsvd->maxprot, newsvd->type, newsvd->cred, NULL);
1764 1764 }
1765 1765 out:
1766 1766 if (error == 0 && HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
1767 1767 ASSERT(newsvd->amp == NULL);
1768 1768 ASSERT(newsvd->tr_state == SEGVN_TR_OFF);
1769 1769 newsvd->rcookie = svd->rcookie;
1770 1770 hat_dup_region(newseg->s_as->a_hat, newsvd->rcookie);
1771 1771 }
1772 1772 return (error);
1773 1773 }
1774 1774
1775 1775
1776 1776 /*
1777 1777 * callback function to invoke free_vp_pages() for only those pages actually
1778 1778 * processed by the HAT when a shared region is destroyed.
1779 1779 */
1780 1780 extern int free_pages;
1781 1781
1782 1782 static void
1783 1783 segvn_hat_rgn_unload_callback(caddr_t saddr, caddr_t eaddr, caddr_t r_saddr,
1784 1784 size_t r_size, void *r_obj, u_offset_t r_objoff)
1785 1785 {
1786 1786 u_offset_t off;
1787 1787 size_t len;
1788 1788 vnode_t *vp = (vnode_t *)r_obj;
1789 1789
1790 1790 ASSERT(eaddr > saddr);
1791 1791 ASSERT(saddr >= r_saddr);
1792 1792 ASSERT(saddr < r_saddr + r_size);
1793 1793 ASSERT(eaddr > r_saddr);
1794 1794 ASSERT(eaddr <= r_saddr + r_size);
1795 1795 ASSERT(vp != NULL);
1796 1796
1797 1797 if (!free_pages) {
1798 1798 return;
1799 1799 }
1800 1800
1801 1801 len = eaddr - saddr;
1802 1802 off = (saddr - r_saddr) + r_objoff;
1803 1803 free_vp_pages(vp, off, len);
1804 1804 }
1805 1805
1806 1806 /*
1807 1807 * callback function used by segvn_unmap to invoke free_vp_pages() for only
1808 1808 * those pages actually processed by the HAT
1809 1809 */
1810 1810 static void
1811 1811 segvn_hat_unload_callback(hat_callback_t *cb)
1812 1812 {
1813 1813 struct seg *seg = cb->hcb_data;
1814 1814 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
1815 1815 size_t len;
1816 1816 u_offset_t off;
1817 1817
1818 1818 ASSERT(svd->vp != NULL);
1819 1819 ASSERT(cb->hcb_end_addr > cb->hcb_start_addr);
1820 1820 ASSERT(cb->hcb_start_addr >= seg->s_base);
1821 1821
1822 1822 len = cb->hcb_end_addr - cb->hcb_start_addr;
1823 1823 off = cb->hcb_start_addr - seg->s_base;
1824 1824 free_vp_pages(svd->vp, svd->offset + off, len);
1825 1825 }
1826 1826
1827 1827 /*
1828 1828 * This function determines the number of bytes of swap reserved by
1829 1829 * a segment for which per-page accounting is present. It is used to
1830 1830 * calculate the correct value of a segvn_data's swresv.
1831 1831 */
1832 1832 static size_t
1833 1833 segvn_count_swap_by_vpages(struct seg *seg)
1834 1834 {
1835 1835 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
1836 1836 struct vpage *vp, *evp;
1837 1837 size_t nswappages = 0;
1838 1838
1839 1839 ASSERT(svd->pageswap);
1840 1840 ASSERT(svd->vpage != NULL);
1841 1841
1842 1842 evp = &svd->vpage[seg_page(seg, seg->s_base + seg->s_size)];
1843 1843
1844 1844 for (vp = svd->vpage; vp < evp; vp++) {
1845 1845 if (VPP_ISSWAPRES(vp))
1846 1846 nswappages++;
1847 1847 }
1848 1848
1849 1849 return (nswappages << PAGESHIFT);
1850 1850 }
1851 1851
1852 1852 static int
1853 1853 segvn_unmap(struct seg *seg, caddr_t addr, size_t len)
1854 1854 {
1855 1855 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
1856 1856 struct segvn_data *nsvd;
1857 1857 struct seg *nseg;
1858 1858 struct anon_map *amp;
1859 1859 pgcnt_t opages; /* old segment size in pages */
1860 1860 pgcnt_t npages; /* new segment size in pages */
1861 1861 pgcnt_t dpages; /* pages being deleted (unmapped) */
1862 1862 hat_callback_t callback; /* used for free_vp_pages() */
1863 1863 hat_callback_t *cbp = NULL;
1864 1864 caddr_t nbase;
1865 1865 size_t nsize;
1866 1866 size_t oswresv;
1867 1867 int reclaim = 1;
1868 1868
1869 1869 /*
1870 1870 * We don't need any segment level locks for "segvn" data
1871 1871 * since the address space is "write" locked.
1872 1872 */
1873 1873 ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
1874 1874
1875 1875 /*
1876 1876 * Fail the unmap if pages are SOFTLOCKed through this mapping.
1877 1877 * softlockcnt is protected from change by the as write lock.
1878 1878 */
1879 1879 retry:
1880 1880 if (svd->softlockcnt > 0) {
1881 1881 ASSERT(svd->tr_state == SEGVN_TR_OFF);
1882 1882
1883 1883 /*
1884 1884 * If this is shared segment non 0 softlockcnt
1885 1885 * means locked pages are still in use.
1886 1886 */
1887 1887 if (svd->type == MAP_SHARED) {
1888 1888 return (EAGAIN);
1889 1889 }
1890 1890
1891 1891 /*
1892 1892 * since we do have the writers lock nobody can fill
1893 1893 * the cache during the purge. The flush either succeeds
1894 1894 * or we still have pending I/Os.
1895 1895 */
1896 1896 if (reclaim == 1) {
1897 1897 segvn_purge(seg);
1898 1898 reclaim = 0;
1899 1899 goto retry;
1900 1900 }
1901 1901 return (EAGAIN);
1902 1902 }
1903 1903
1904 1904 /*
1905 1905 * Check for bad sizes
1906 1906 */
1907 1907 if (addr < seg->s_base || addr + len > seg->s_base + seg->s_size ||
1908 1908 (len & PAGEOFFSET) || ((uintptr_t)addr & PAGEOFFSET)) {
1909 1909 panic("segvn_unmap");
1910 1910 /*NOTREACHED*/
1911 1911 }
1912 1912
1913 1913 if (seg->s_szc != 0) {
1914 1914 size_t pgsz = page_get_pagesize(seg->s_szc);
1915 1915 int err;
1916 1916 if (!IS_P2ALIGNED(addr, pgsz) || !IS_P2ALIGNED(len, pgsz)) {
1917 1917 ASSERT(seg->s_base != addr || seg->s_size != len);
1918 1918 if (HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
1919 1919 ASSERT(svd->amp == NULL);
1920 1920 ASSERT(svd->tr_state == SEGVN_TR_OFF);
1921 1921 hat_leave_region(seg->s_as->a_hat,
1922 1922 svd->rcookie, HAT_REGION_TEXT);
1923 1923 svd->rcookie = HAT_INVALID_REGION_COOKIE;
1924 1924 /*
1925 1925 * could pass a flag to segvn_demote_range()
1926 1926 * below to tell it not to do any unloads but
1927 1927 * this case is rare enough to not bother for
1928 1928 * now.
1929 1929 */
1930 1930 } else if (svd->tr_state == SEGVN_TR_INIT) {
1931 1931 svd->tr_state = SEGVN_TR_OFF;
1932 1932 } else if (svd->tr_state == SEGVN_TR_ON) {
1933 1933 ASSERT(svd->amp != NULL);
1934 1934 segvn_textunrepl(seg, 1);
1935 1935 ASSERT(svd->amp == NULL);
1936 1936 ASSERT(svd->tr_state == SEGVN_TR_OFF);
1937 1937 }
1938 1938 VM_STAT_ADD(segvnvmstats.demoterange[0]);
1939 1939 err = segvn_demote_range(seg, addr, len, SDR_END, 0);
1940 1940 if (err == 0) {
1941 1941 return (IE_RETRY);
1942 1942 }
1943 1943 return (err);
1944 1944 }
1945 1945 }
1946 1946
1947 1947 /* Inform the vnode of the unmapping. */
1948 1948 if (svd->vp) {
1949 1949 int error;
1950 1950
1951 1951 error = VOP_DELMAP(svd->vp,
1952 1952 (offset_t)svd->offset + (uintptr_t)(addr - seg->s_base),
1953 1953 seg->s_as, addr, len, svd->prot, svd->maxprot,
1954 1954 svd->type, svd->cred, NULL);
1955 1955
1956 1956 if (error == EAGAIN)
1957 1957 return (error);
1958 1958 }
1959 1959
1960 1960 /*
1961 1961 * Remove any page locks set through this mapping.
1962 1962 * If text replication is not off no page locks could have been
1963 1963 * established via this mapping.
1964 1964 */
1965 1965 if (svd->tr_state == SEGVN_TR_OFF) {
1966 1966 (void) segvn_lockop(seg, addr, len, 0, MC_UNLOCK, NULL, 0);
1967 1967 }
1968 1968
1969 1969 if (HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
1970 1970 ASSERT(svd->amp == NULL);
1971 1971 ASSERT(svd->tr_state == SEGVN_TR_OFF);
1972 1972 ASSERT(svd->type == MAP_PRIVATE);
1973 1973 hat_leave_region(seg->s_as->a_hat, svd->rcookie,
1974 1974 HAT_REGION_TEXT);
1975 1975 svd->rcookie = HAT_INVALID_REGION_COOKIE;
1976 1976 } else if (svd->tr_state == SEGVN_TR_ON) {
1977 1977 ASSERT(svd->amp != NULL);
1978 1978 ASSERT(svd->pageprot == 0 && !(svd->prot & PROT_WRITE));
1979 1979 segvn_textunrepl(seg, 1);
1980 1980 ASSERT(svd->amp == NULL && svd->tr_state == SEGVN_TR_OFF);
1981 1981 } else {
1982 1982 if (svd->tr_state != SEGVN_TR_OFF) {
1983 1983 ASSERT(svd->tr_state == SEGVN_TR_INIT);
1984 1984 svd->tr_state = SEGVN_TR_OFF;
1985 1985 }
1986 1986 /*
1987 1987 * Unload any hardware translations in the range to be taken
1988 1988 * out. Use a callback to invoke free_vp_pages() effectively.
1989 1989 */
1990 1990 if (svd->vp != NULL && free_pages != 0) {
1991 1991 callback.hcb_data = seg;
1992 1992 callback.hcb_function = segvn_hat_unload_callback;
1993 1993 cbp = &callback;
1994 1994 }
1995 1995 hat_unload_callback(seg->s_as->a_hat, addr, len,
1996 1996 HAT_UNLOAD_UNMAP, cbp);
1997 1997
1998 1998 if (svd->type == MAP_SHARED && svd->vp != NULL &&
1999 1999 (svd->vp->v_flag & VVMEXEC) &&
2000 2000 ((svd->prot & PROT_WRITE) || svd->pageprot)) {
2001 2001 segvn_inval_trcache(svd->vp);
2002 2002 }
2003 2003 }
2004 2004
2005 2005 /*
2006 2006 * Check for entire segment
2007 2007 */
2008 2008 if (addr == seg->s_base && len == seg->s_size) {
2009 2009 seg_free(seg);
2010 2010 return (0);
2011 2011 }
2012 2012
2013 2013 opages = seg_pages(seg);
2014 2014 dpages = btop(len);
2015 2015 npages = opages - dpages;
2016 2016 amp = svd->amp;
2017 2017 ASSERT(amp == NULL || amp->a_szc >= seg->s_szc);
2018 2018
2019 2019 /*
2020 2020 * Check for beginning of segment
2021 2021 */
2022 2022 if (addr == seg->s_base) {
2023 2023 if (svd->vpage != NULL) {
2024 2024 size_t nbytes;
2025 2025 struct vpage *ovpage;
2026 2026
2027 2027 ovpage = svd->vpage; /* keep pointer to vpage */
2028 2028
2029 2029 nbytes = vpgtob(npages);
2030 2030 svd->vpage = kmem_alloc(nbytes, KM_SLEEP);
2031 2031 bcopy(&ovpage[dpages], svd->vpage, nbytes);
2032 2032
2033 2033 /* free up old vpage */
2034 2034 kmem_free(ovpage, vpgtob(opages));
2035 2035 }
2036 2036 if (amp != NULL) {
2037 2037 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
2038 2038 if (amp->refcnt == 1 || svd->type == MAP_PRIVATE) {
2039 2039 /*
2040 2040 * Shared anon map is no longer in use. Before
2041 2041 * freeing its pages purge all entries from
2042 2042 * pcache that belong to this amp.
2043 2043 */
2044 2044 if (svd->type == MAP_SHARED) {
2045 2045 ASSERT(amp->refcnt == 1);
2046 2046 ASSERT(svd->softlockcnt == 0);
2047 2047 anonmap_purge(amp);
2048 2048 }
2049 2049 /*
2050 2050 * Free up now unused parts of anon_map array.
2051 2051 */
2052 2052 if (amp->a_szc == seg->s_szc) {
2053 2053 if (seg->s_szc != 0) {
2054 2054 anon_free_pages(amp->ahp,
2055 2055 svd->anon_index, len,
2056 2056 seg->s_szc);
2057 2057 } else {
2058 2058 anon_free(amp->ahp,
2059 2059 svd->anon_index,
2060 2060 len);
2061 2061 }
2062 2062 } else {
2063 2063 ASSERT(svd->type == MAP_SHARED);
2064 2064 ASSERT(amp->a_szc > seg->s_szc);
2065 2065 anon_shmap_free_pages(amp,
2066 2066 svd->anon_index, len);
2067 2067 }
2068 2068
2069 2069 /*
2070 2070 * Unreserve swap space for the
2071 2071 * unmapped chunk of this segment in
2072 2072 * case it's MAP_SHARED
2073 2073 */
2074 2074 if (svd->type == MAP_SHARED) {
2075 2075 anon_unresv_zone(len,
2076 2076 seg->s_as->a_proc->p_zone);
2077 2077 amp->swresv -= len;
2078 2078 }
2079 2079 }
2080 2080 ANON_LOCK_EXIT(&->a_rwlock);
2081 2081 svd->anon_index += dpages;
2082 2082 }
2083 2083 if (svd->vp != NULL)
2084 2084 svd->offset += len;
2085 2085
2086 2086 seg->s_base += len;
2087 2087 seg->s_size -= len;
2088 2088
2089 2089 if (svd->swresv) {
2090 2090 if (svd->flags & MAP_NORESERVE) {
2091 2091 ASSERT(amp);
2092 2092 oswresv = svd->swresv;
2093 2093
2094 2094 svd->swresv = ptob(anon_pages(amp->ahp,
2095 2095 svd->anon_index, npages));
2096 2096 anon_unresv_zone(oswresv - svd->swresv,
2097 2097 seg->s_as->a_proc->p_zone);
2098 2098 if (SEG_IS_PARTIAL_RESV(seg))
2099 2099 seg->s_as->a_resvsize -= oswresv -
2100 2100 svd->swresv;
2101 2101 } else {
2102 2102 size_t unlen;
2103 2103
2104 2104 if (svd->pageswap) {
2105 2105 oswresv = svd->swresv;
2106 2106 svd->swresv =
2107 2107 segvn_count_swap_by_vpages(seg);
2108 2108 ASSERT(oswresv >= svd->swresv);
2109 2109 unlen = oswresv - svd->swresv;
2110 2110 } else {
2111 2111 svd->swresv -= len;
2112 2112 ASSERT(svd->swresv == seg->s_size);
2113 2113 unlen = len;
2114 2114 }
2115 2115 anon_unresv_zone(unlen,
2116 2116 seg->s_as->a_proc->p_zone);
2117 2117 }
2118 2118 TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u",
2119 2119 seg, len, 0);
2120 2120 }
2121 2121
2122 2122 return (0);
2123 2123 }
2124 2124
2125 2125 /*
2126 2126 * Check for end of segment
2127 2127 */
2128 2128 if (addr + len == seg->s_base + seg->s_size) {
2129 2129 if (svd->vpage != NULL) {
2130 2130 size_t nbytes;
2131 2131 struct vpage *ovpage;
2132 2132
2133 2133 ovpage = svd->vpage; /* keep pointer to vpage */
2134 2134
2135 2135 nbytes = vpgtob(npages);
2136 2136 svd->vpage = kmem_alloc(nbytes, KM_SLEEP);
2137 2137 bcopy(ovpage, svd->vpage, nbytes);
2138 2138
2139 2139 /* free up old vpage */
2140 2140 kmem_free(ovpage, vpgtob(opages));
2141 2141
2142 2142 }
2143 2143 if (amp != NULL) {
2144 2144 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
2145 2145 if (amp->refcnt == 1 || svd->type == MAP_PRIVATE) {
2146 2146 /*
2147 2147 * Free up now unused parts of anon_map array.
2148 2148 */
2149 2149 ulong_t an_idx = svd->anon_index + npages;
2150 2150
2151 2151 /*
2152 2152 * Shared anon map is no longer in use. Before
2153 2153 * freeing its pages purge all entries from
2154 2154 * pcache that belong to this amp.
2155 2155 */
2156 2156 if (svd->type == MAP_SHARED) {
2157 2157 ASSERT(amp->refcnt == 1);
2158 2158 ASSERT(svd->softlockcnt == 0);
2159 2159 anonmap_purge(amp);
2160 2160 }
2161 2161
2162 2162 if (amp->a_szc == seg->s_szc) {
2163 2163 if (seg->s_szc != 0) {
2164 2164 anon_free_pages(amp->ahp,
2165 2165 an_idx, len,
2166 2166 seg->s_szc);
2167 2167 } else {
2168 2168 anon_free(amp->ahp, an_idx,
2169 2169 len);
2170 2170 }
2171 2171 } else {
2172 2172 ASSERT(svd->type == MAP_SHARED);
2173 2173 ASSERT(amp->a_szc > seg->s_szc);
2174 2174 anon_shmap_free_pages(amp,
2175 2175 an_idx, len);
2176 2176 }
2177 2177
2178 2178 /*
2179 2179 * Unreserve swap space for the
2180 2180 * unmapped chunk of this segment in
2181 2181 * case it's MAP_SHARED
2182 2182 */
2183 2183 if (svd->type == MAP_SHARED) {
2184 2184 anon_unresv_zone(len,
2185 2185 seg->s_as->a_proc->p_zone);
2186 2186 amp->swresv -= len;
2187 2187 }
2188 2188 }
2189 2189 ANON_LOCK_EXIT(&->a_rwlock);
2190 2190 }
2191 2191
2192 2192 seg->s_size -= len;
2193 2193
2194 2194 if (svd->swresv) {
2195 2195 if (svd->flags & MAP_NORESERVE) {
2196 2196 ASSERT(amp);
2197 2197 oswresv = svd->swresv;
2198 2198 svd->swresv = ptob(anon_pages(amp->ahp,
2199 2199 svd->anon_index, npages));
2200 2200 anon_unresv_zone(oswresv - svd->swresv,
2201 2201 seg->s_as->a_proc->p_zone);
2202 2202 if (SEG_IS_PARTIAL_RESV(seg))
2203 2203 seg->s_as->a_resvsize -= oswresv -
2204 2204 svd->swresv;
2205 2205 } else {
2206 2206 size_t unlen;
2207 2207
2208 2208 if (svd->pageswap) {
2209 2209 oswresv = svd->swresv;
2210 2210 svd->swresv =
2211 2211 segvn_count_swap_by_vpages(seg);
2212 2212 ASSERT(oswresv >= svd->swresv);
2213 2213 unlen = oswresv - svd->swresv;
2214 2214 } else {
2215 2215 svd->swresv -= len;
2216 2216 ASSERT(svd->swresv == seg->s_size);
2217 2217 unlen = len;
2218 2218 }
2219 2219 anon_unresv_zone(unlen,
2220 2220 seg->s_as->a_proc->p_zone);
2221 2221 }
2222 2222 TRACE_3(TR_FAC_VM, TR_ANON_PROC,
2223 2223 "anon proc:%p %lu %u", seg, len, 0);
2224 2224 }
2225 2225
2226 2226 return (0);
2227 2227 }
2228 2228
2229 2229 /*
2230 2230 * The section to go is in the middle of the segment,
2231 2231 * have to make it into two segments. nseg is made for
2232 2232 * the high end while seg is cut down at the low end.
2233 2233 */
2234 2234 nbase = addr + len; /* new seg base */
2235 2235 nsize = (seg->s_base + seg->s_size) - nbase; /* new seg size */
2236 2236 seg->s_size = addr - seg->s_base; /* shrink old seg */
2237 2237 nseg = seg_alloc(seg->s_as, nbase, nsize);
2238 2238 if (nseg == NULL) {
2239 2239 panic("segvn_unmap seg_alloc");
2240 2240 /*NOTREACHED*/
2241 2241 }
2242 2242 nseg->s_ops = seg->s_ops;
2243 2243 nsvd = kmem_cache_alloc(segvn_cache, KM_SLEEP);
2244 2244 nseg->s_data = (void *)nsvd;
2245 2245 nseg->s_szc = seg->s_szc;
2246 2246 *nsvd = *svd;
2247 2247 nsvd->seg = nseg;
2248 2248 nsvd->offset = svd->offset + (uintptr_t)(nseg->s_base - seg->s_base);
2249 2249 nsvd->swresv = 0;
2250 2250 nsvd->softlockcnt = 0;
2251 2251 nsvd->softlockcnt_sbase = 0;
2252 2252 nsvd->softlockcnt_send = 0;
2253 2253 nsvd->svn_inz = svd->svn_inz;
2254 2254 ASSERT(nsvd->rcookie == HAT_INVALID_REGION_COOKIE);
2255 2255
2256 2256 if (svd->vp != NULL) {
2257 2257 VN_HOLD(nsvd->vp);
2258 2258 if (nsvd->type == MAP_SHARED)
2259 2259 lgrp_shm_policy_init(NULL, nsvd->vp);
2260 2260 }
2261 2261 crhold(svd->cred);
2262 2262
2263 2263 if (svd->vpage == NULL) {
2264 2264 nsvd->vpage = NULL;
2265 2265 } else {
2266 2266 /* need to split vpage into two arrays */
2267 2267 size_t nbytes;
2268 2268 struct vpage *ovpage;
2269 2269
2270 2270 ovpage = svd->vpage; /* keep pointer to vpage */
2271 2271
2272 2272 npages = seg_pages(seg); /* seg has shrunk */
2273 2273 nbytes = vpgtob(npages);
2274 2274 svd->vpage = kmem_alloc(nbytes, KM_SLEEP);
2275 2275
2276 2276 bcopy(ovpage, svd->vpage, nbytes);
2277 2277
2278 2278 npages = seg_pages(nseg);
2279 2279 nbytes = vpgtob(npages);
2280 2280 nsvd->vpage = kmem_alloc(nbytes, KM_SLEEP);
2281 2281
2282 2282 bcopy(&ovpage[opages - npages], nsvd->vpage, nbytes);
2283 2283
2284 2284 /* free up old vpage */
2285 2285 kmem_free(ovpage, vpgtob(opages));
2286 2286 }
2287 2287
2288 2288 if (amp == NULL) {
2289 2289 nsvd->amp = NULL;
2290 2290 nsvd->anon_index = 0;
2291 2291 } else {
2292 2292 /*
2293 2293 * Need to create a new anon map for the new segment.
2294 2294 * We'll also allocate a new smaller array for the old
2295 2295 * smaller segment to save space.
2296 2296 */
2297 2297 opages = btop((uintptr_t)(addr - seg->s_base));
2298 2298 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
2299 2299 if (amp->refcnt == 1 || svd->type == MAP_PRIVATE) {
2300 2300 /*
2301 2301 * Free up now unused parts of anon_map array.
2302 2302 */
2303 2303 ulong_t an_idx = svd->anon_index + opages;
2304 2304
2305 2305 /*
2306 2306 * Shared anon map is no longer in use. Before
2307 2307 * freeing its pages purge all entries from
2308 2308 * pcache that belong to this amp.
2309 2309 */
2310 2310 if (svd->type == MAP_SHARED) {
2311 2311 ASSERT(amp->refcnt == 1);
2312 2312 ASSERT(svd->softlockcnt == 0);
2313 2313 anonmap_purge(amp);
2314 2314 }
2315 2315
2316 2316 if (amp->a_szc == seg->s_szc) {
2317 2317 if (seg->s_szc != 0) {
2318 2318 anon_free_pages(amp->ahp, an_idx, len,
2319 2319 seg->s_szc);
2320 2320 } else {
2321 2321 anon_free(amp->ahp, an_idx,
2322 2322 len);
2323 2323 }
2324 2324 } else {
2325 2325 ASSERT(svd->type == MAP_SHARED);
2326 2326 ASSERT(amp->a_szc > seg->s_szc);
2327 2327 anon_shmap_free_pages(amp, an_idx, len);
2328 2328 }
2329 2329
2330 2330 /*
2331 2331 * Unreserve swap space for the
2332 2332 * unmapped chunk of this segment in
2333 2333 * case it's MAP_SHARED
2334 2334 */
2335 2335 if (svd->type == MAP_SHARED) {
2336 2336 anon_unresv_zone(len,
2337 2337 seg->s_as->a_proc->p_zone);
2338 2338 amp->swresv -= len;
2339 2339 }
2340 2340 }
2341 2341 nsvd->anon_index = svd->anon_index +
2342 2342 btop((uintptr_t)(nseg->s_base - seg->s_base));
2343 2343 if (svd->type == MAP_SHARED) {
2344 2344 amp->refcnt++;
2345 2345 nsvd->amp = amp;
2346 2346 } else {
2347 2347 struct anon_map *namp;
2348 2348 struct anon_hdr *nahp;
2349 2349
2350 2350 ASSERT(svd->type == MAP_PRIVATE);
2351 2351 nahp = anon_create(btop(seg->s_size), ANON_SLEEP);
2352 2352 namp = anonmap_alloc(nseg->s_size, 0, ANON_SLEEP);
2353 2353 namp->a_szc = seg->s_szc;
2354 2354 (void) anon_copy_ptr(amp->ahp, svd->anon_index, nahp,
2355 2355 0, btop(seg->s_size), ANON_SLEEP);
2356 2356 (void) anon_copy_ptr(amp->ahp, nsvd->anon_index,
2357 2357 namp->ahp, 0, btop(nseg->s_size), ANON_SLEEP);
2358 2358 anon_release(amp->ahp, btop(amp->size));
2359 2359 svd->anon_index = 0;
2360 2360 nsvd->anon_index = 0;
2361 2361 amp->ahp = nahp;
2362 2362 amp->size = seg->s_size;
2363 2363 nsvd->amp = namp;
2364 2364 }
2365 2365 ANON_LOCK_EXIT(&->a_rwlock);
2366 2366 }
2367 2367 if (svd->swresv) {
2368 2368 if (svd->flags & MAP_NORESERVE) {
2369 2369 ASSERT(amp);
2370 2370 oswresv = svd->swresv;
2371 2371 svd->swresv = ptob(anon_pages(amp->ahp,
2372 2372 svd->anon_index, btop(seg->s_size)));
2373 2373 nsvd->swresv = ptob(anon_pages(nsvd->amp->ahp,
2374 2374 nsvd->anon_index, btop(nseg->s_size)));
2375 2375 ASSERT(oswresv >= (svd->swresv + nsvd->swresv));
2376 2376 anon_unresv_zone(oswresv - (svd->swresv + nsvd->swresv),
2377 2377 seg->s_as->a_proc->p_zone);
2378 2378 if (SEG_IS_PARTIAL_RESV(seg))
2379 2379 seg->s_as->a_resvsize -= oswresv -
2380 2380 (svd->swresv + nsvd->swresv);
2381 2381 } else {
2382 2382 size_t unlen;
2383 2383
2384 2384 if (svd->pageswap) {
2385 2385 oswresv = svd->swresv;
2386 2386 svd->swresv = segvn_count_swap_by_vpages(seg);
2387 2387 nsvd->swresv = segvn_count_swap_by_vpages(nseg);
2388 2388 ASSERT(oswresv >= (svd->swresv + nsvd->swresv));
2389 2389 unlen = oswresv - (svd->swresv + nsvd->swresv);
2390 2390 } else {
2391 2391 if (seg->s_size + nseg->s_size + len !=
2392 2392 svd->swresv) {
2393 2393 panic("segvn_unmap: cannot split "
2394 2394 "swap reservation");
2395 2395 /*NOTREACHED*/
2396 2396 }
2397 2397 svd->swresv = seg->s_size;
2398 2398 nsvd->swresv = nseg->s_size;
2399 2399 unlen = len;
2400 2400 }
2401 2401 anon_unresv_zone(unlen,
2402 2402 seg->s_as->a_proc->p_zone);
2403 2403 }
2404 2404 TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u",
2405 2405 seg, len, 0);
2406 2406 }
2407 2407
2408 2408 return (0); /* I'm glad that's all over with! */
2409 2409 }
2410 2410
2411 2411 static void
2412 2412 segvn_free(struct seg *seg)
2413 2413 {
2414 2414 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
2415 2415 pgcnt_t npages = seg_pages(seg);
2416 2416 struct anon_map *amp;
2417 2417 size_t len;
2418 2418
2419 2419 /*
2420 2420 * We don't need any segment level locks for "segvn" data
2421 2421 * since the address space is "write" locked.
2422 2422 */
2423 2423 ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
2424 2424 ASSERT(svd->tr_state == SEGVN_TR_OFF);
2425 2425
2426 2426 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
2427 2427
2428 2428 /*
2429 2429 * Be sure to unlock pages. XXX Why do things get free'ed instead
2430 2430 * of unmapped? XXX
2431 2431 */
2432 2432 (void) segvn_lockop(seg, seg->s_base, seg->s_size,
2433 2433 0, MC_UNLOCK, NULL, 0);
2434 2434
2435 2435 /*
2436 2436 * Deallocate the vpage and anon pointers if necessary and possible.
2437 2437 */
2438 2438 if (svd->vpage != NULL) {
2439 2439 kmem_free(svd->vpage, vpgtob(npages));
2440 2440 svd->vpage = NULL;
2441 2441 }
2442 2442 if ((amp = svd->amp) != NULL) {
2443 2443 /*
2444 2444 * If there are no more references to this anon_map
2445 2445 * structure, then deallocate the structure after freeing
2446 2446 * up all the anon slot pointers that we can.
2447 2447 */
2448 2448 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
2449 2449 ASSERT(amp->a_szc >= seg->s_szc);
2450 2450 if (--amp->refcnt == 0) {
2451 2451 if (svd->type == MAP_PRIVATE) {
2452 2452 /*
2453 2453 * Private - we only need to anon_free
2454 2454 * the part that this segment refers to.
2455 2455 */
2456 2456 if (seg->s_szc != 0) {
2457 2457 anon_free_pages(amp->ahp,
2458 2458 svd->anon_index, seg->s_size,
2459 2459 seg->s_szc);
2460 2460 } else {
2461 2461 anon_free(amp->ahp, svd->anon_index,
2462 2462 seg->s_size);
2463 2463 }
2464 2464 } else {
2465 2465
2466 2466 /*
2467 2467 * Shared anon map is no longer in use. Before
2468 2468 * freeing its pages purge all entries from
2469 2469 * pcache that belong to this amp.
2470 2470 */
2471 2471 ASSERT(svd->softlockcnt == 0);
2472 2472 anonmap_purge(amp);
2473 2473
2474 2474 /*
2475 2475 * Shared - anon_free the entire
2476 2476 * anon_map's worth of stuff and
2477 2477 * release any swap reservation.
2478 2478 */
2479 2479 if (amp->a_szc != 0) {
2480 2480 anon_shmap_free_pages(amp, 0,
2481 2481 amp->size);
2482 2482 } else {
2483 2483 anon_free(amp->ahp, 0, amp->size);
2484 2484 }
2485 2485 if ((len = amp->swresv) != 0) {
2486 2486 anon_unresv_zone(len,
2487 2487 seg->s_as->a_proc->p_zone);
2488 2488 TRACE_3(TR_FAC_VM, TR_ANON_PROC,
2489 2489 "anon proc:%p %lu %u", seg, len, 0);
2490 2490 }
2491 2491 }
2492 2492 svd->amp = NULL;
2493 2493 ANON_LOCK_EXIT(&->a_rwlock);
2494 2494 anonmap_free(amp);
2495 2495 } else if (svd->type == MAP_PRIVATE) {
2496 2496 /*
2497 2497 * We had a private mapping which still has
2498 2498 * a held anon_map so just free up all the
2499 2499 * anon slot pointers that we were using.
2500 2500 */
2501 2501 if (seg->s_szc != 0) {
2502 2502 anon_free_pages(amp->ahp, svd->anon_index,
2503 2503 seg->s_size, seg->s_szc);
2504 2504 } else {
2505 2505 anon_free(amp->ahp, svd->anon_index,
2506 2506 seg->s_size);
2507 2507 }
2508 2508 ANON_LOCK_EXIT(&->a_rwlock);
2509 2509 } else {
2510 2510 ANON_LOCK_EXIT(&->a_rwlock);
2511 2511 }
2512 2512 }
2513 2513
2514 2514 /*
2515 2515 * Release swap reservation.
2516 2516 */
2517 2517 if ((len = svd->swresv) != 0) {
2518 2518 anon_unresv_zone(svd->swresv,
2519 2519 seg->s_as->a_proc->p_zone);
2520 2520 TRACE_3(TR_FAC_VM, TR_ANON_PROC, "anon proc:%p %lu %u",
2521 2521 seg, len, 0);
2522 2522 if (SEG_IS_PARTIAL_RESV(seg))
2523 2523 seg->s_as->a_resvsize -= svd->swresv;
2524 2524 svd->swresv = 0;
2525 2525 }
2526 2526 /*
2527 2527 * Release claim on vnode, credentials, and finally free the
2528 2528 * private data.
2529 2529 */
2530 2530 if (svd->vp != NULL) {
2531 2531 if (svd->type == MAP_SHARED)
2532 2532 lgrp_shm_policy_fini(NULL, svd->vp);
2533 2533 VN_RELE(svd->vp);
2534 2534 svd->vp = NULL;
2535 2535 }
2536 2536 crfree(svd->cred);
2537 2537 svd->pageprot = 0;
2538 2538 svd->pageadvice = 0;
2539 2539 svd->pageswap = 0;
2540 2540 svd->cred = NULL;
2541 2541
2542 2542 /*
2543 2543 * Take segfree_syncmtx lock to let segvn_reclaim() finish if it's
2544 2544 * still working with this segment without holding as lock (in case
2545 2545 * it's called by pcache async thread).
2546 2546 */
2547 2547 ASSERT(svd->softlockcnt == 0);
2548 2548 mutex_enter(&svd->segfree_syncmtx);
2549 2549 mutex_exit(&svd->segfree_syncmtx);
2550 2550
2551 2551 seg->s_data = NULL;
2552 2552 kmem_cache_free(segvn_cache, svd);
2553 2553 }
2554 2554
2555 2555 /*
2556 2556 * Do a F_SOFTUNLOCK call over the range requested. The range must have
2557 2557 * already been F_SOFTLOCK'ed.
2558 2558 * Caller must always match addr and len of a softunlock with a previous
2559 2559 * softlock with exactly the same addr and len.
2560 2560 */
2561 2561 static void
2562 2562 segvn_softunlock(struct seg *seg, caddr_t addr, size_t len, enum seg_rw rw)
2563 2563 {
2564 2564 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
2565 2565 page_t *pp;
2566 2566 caddr_t adr;
2567 2567 struct vnode *vp;
2568 2568 u_offset_t offset;
2569 2569 ulong_t anon_index;
2570 2570 struct anon_map *amp;
2571 2571 struct anon *ap = NULL;
2572 2572
2573 2573 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
2574 2574 ASSERT(SEGVN_LOCK_HELD(seg->s_as, &svd->lock));
2575 2575
2576 2576 if ((amp = svd->amp) != NULL)
2577 2577 anon_index = svd->anon_index + seg_page(seg, addr);
2578 2578
2579 2579 if (HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
2580 2580 ASSERT(svd->tr_state == SEGVN_TR_OFF);
2581 2581 hat_unlock_region(seg->s_as->a_hat, addr, len, svd->rcookie);
2582 2582 } else {
2583 2583 hat_unlock(seg->s_as->a_hat, addr, len);
2584 2584 }
2585 2585 for (adr = addr; adr < addr + len; adr += PAGESIZE) {
2586 2586 if (amp != NULL) {
2587 2587 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
2588 2588 if ((ap = anon_get_ptr(amp->ahp, anon_index++))
2589 2589 != NULL) {
2590 2590 swap_xlate(ap, &vp, &offset);
2591 2591 } else {
2592 2592 vp = svd->vp;
2593 2593 offset = svd->offset +
2594 2594 (uintptr_t)(adr - seg->s_base);
2595 2595 }
2596 2596 ANON_LOCK_EXIT(&->a_rwlock);
2597 2597 } else {
2598 2598 vp = svd->vp;
2599 2599 offset = svd->offset +
2600 2600 (uintptr_t)(adr - seg->s_base);
2601 2601 }
2602 2602
2603 2603 /*
2604 2604 * Use page_find() instead of page_lookup() to
2605 2605 * find the page since we know that it is locked.
2606 2606 */
2607 2607 pp = page_find(vp, offset);
2608 2608 if (pp == NULL) {
2609 2609 panic(
2610 2610 "segvn_softunlock: addr %p, ap %p, vp %p, off %llx",
2611 2611 (void *)adr, (void *)ap, (void *)vp, offset);
2612 2612 /*NOTREACHED*/
2613 2613 }
2614 2614
2615 2615 if (rw == S_WRITE) {
2616 2616 hat_setrefmod(pp);
2617 2617 if (seg->s_as->a_vbits)
2618 2618 hat_setstat(seg->s_as, adr, PAGESIZE,
2619 2619 P_REF | P_MOD);
2620 2620 } else if (rw != S_OTHER) {
2621 2621 hat_setref(pp);
2622 2622 if (seg->s_as->a_vbits)
2623 2623 hat_setstat(seg->s_as, adr, PAGESIZE, P_REF);
2624 2624 }
2625 2625 TRACE_3(TR_FAC_VM, TR_SEGVN_FAULT,
2626 2626 "segvn_fault:pp %p vp %p offset %llx", pp, vp, offset);
2627 2627 page_unlock(pp);
2628 2628 }
2629 2629 ASSERT(svd->softlockcnt >= btop(len));
2630 2630 if (!atomic_add_long_nv((ulong_t *)&svd->softlockcnt, -btop(len))) {
2631 2631 /*
2632 2632 * All SOFTLOCKS are gone. Wakeup any waiting
2633 2633 * unmappers so they can try again to unmap.
2634 2634 * Check for waiters first without the mutex
2635 2635 * held so we don't always grab the mutex on
2636 2636 * softunlocks.
2637 2637 */
2638 2638 if (AS_ISUNMAPWAIT(seg->s_as)) {
2639 2639 mutex_enter(&seg->s_as->a_contents);
2640 2640 if (AS_ISUNMAPWAIT(seg->s_as)) {
2641 2641 AS_CLRUNMAPWAIT(seg->s_as);
2642 2642 cv_broadcast(&seg->s_as->a_cv);
2643 2643 }
2644 2644 mutex_exit(&seg->s_as->a_contents);
2645 2645 }
2646 2646 }
2647 2647 }
2648 2648
2649 2649 #define PAGE_HANDLED ((page_t *)-1)
2650 2650
2651 2651 /*
2652 2652 * Release all the pages in the NULL terminated ppp list
2653 2653 * which haven't already been converted to PAGE_HANDLED.
2654 2654 */
2655 2655 static void
2656 2656 segvn_pagelist_rele(page_t **ppp)
2657 2657 {
2658 2658 for (; *ppp != NULL; ppp++) {
2659 2659 if (*ppp != PAGE_HANDLED)
2660 2660 page_unlock(*ppp);
2661 2661 }
2662 2662 }
2663 2663
2664 2664 static int stealcow = 1;
2665 2665
2666 2666 /*
2667 2667 * Workaround for viking chip bug. See bug id 1220902.
2668 2668 * To fix this down in pagefault() would require importing so
2669 2669 * much as and segvn code as to be unmaintainable.
2670 2670 */
2671 2671 int enable_mbit_wa = 0;
2672 2672
2673 2673 /*
2674 2674 * Handles all the dirty work of getting the right
2675 2675 * anonymous pages and loading up the translations.
2676 2676 * This routine is called only from segvn_fault()
2677 2677 * when looping over the range of addresses requested.
2678 2678 *
2679 2679 * The basic algorithm here is:
2680 2680 * If this is an anon_zero case
2681 2681 * Call anon_zero to allocate page
2682 2682 * Load up translation
2683 2683 * Return
2684 2684 * endif
2685 2685 * If this is an anon page
2686 2686 * Use anon_getpage to get the page
2687 2687 * else
2688 2688 * Find page in pl[] list passed in
2689 2689 * endif
2690 2690 * If not a cow
2691 2691 * Load up the translation to the page
2692 2692 * return
2693 2693 * endif
2694 2694 * Call anon_private to handle cow
2695 2695 * Load up (writable) translation to new page
2696 2696 */
2697 2697 static faultcode_t
2698 2698 segvn_faultpage(
2699 2699 struct hat *hat, /* the hat to use for mapping */
2700 2700 struct seg *seg, /* seg_vn of interest */
2701 2701 caddr_t addr, /* address in as */
2702 2702 u_offset_t off, /* offset in vp */
2703 2703 struct vpage *vpage, /* pointer to vpage for vp, off */
2704 2704 page_t *pl[], /* object source page pointer */
2705 2705 uint_t vpprot, /* access allowed to object pages */
2706 2706 enum fault_type type, /* type of fault */
2707 2707 enum seg_rw rw, /* type of access at fault */
2708 2708 int brkcow) /* we may need to break cow */
2709 2709 {
2710 2710 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
2711 2711 page_t *pp, **ppp;
2712 2712 uint_t pageflags = 0;
2713 2713 page_t *anon_pl[1 + 1];
2714 2714 page_t *opp = NULL; /* original page */
2715 2715 uint_t prot;
2716 2716 int err;
2717 2717 int cow;
2718 2718 int claim;
2719 2719 int steal = 0;
2720 2720 ulong_t anon_index;
2721 2721 struct anon *ap, *oldap;
2722 2722 struct anon_map *amp;
2723 2723 int hat_flag = (type == F_SOFTLOCK) ? HAT_LOAD_LOCK : HAT_LOAD;
2724 2724 int anon_lock = 0;
2725 2725 anon_sync_obj_t cookie;
2726 2726
2727 2727 if (svd->flags & MAP_TEXT) {
2728 2728 hat_flag |= HAT_LOAD_TEXT;
2729 2729 }
2730 2730
2731 2731 ASSERT(SEGVN_READ_HELD(seg->s_as, &svd->lock));
2732 2732 ASSERT(seg->s_szc == 0);
2733 2733 ASSERT(svd->tr_state != SEGVN_TR_INIT);
2734 2734
2735 2735 /*
2736 2736 * Initialize protection value for this page.
2737 2737 * If we have per page protection values check it now.
2738 2738 */
2739 2739 if (svd->pageprot) {
2740 2740 uint_t protchk;
2741 2741
2742 2742 switch (rw) {
2743 2743 case S_READ:
2744 2744 protchk = PROT_READ;
2745 2745 break;
2746 2746 case S_WRITE:
2747 2747 protchk = PROT_WRITE;
2748 2748 break;
2749 2749 case S_EXEC:
2750 2750 protchk = PROT_EXEC;
2751 2751 break;
2752 2752 case S_OTHER:
2753 2753 default:
2754 2754 protchk = PROT_READ | PROT_WRITE | PROT_EXEC;
2755 2755 break;
2756 2756 }
2757 2757
2758 2758 prot = VPP_PROT(vpage);
2759 2759 if ((prot & protchk) == 0)
2760 2760 return (FC_PROT); /* illegal access type */
2761 2761 } else {
2762 2762 prot = svd->prot;
2763 2763 }
2764 2764
2765 2765 if (type == F_SOFTLOCK) {
2766 2766 atomic_inc_ulong((ulong_t *)&svd->softlockcnt);
2767 2767 }
2768 2768
2769 2769 /*
2770 2770 * Always acquire the anon array lock to prevent 2 threads from
2771 2771 * allocating separate anon slots for the same "addr".
2772 2772 */
2773 2773
2774 2774 if ((amp = svd->amp) != NULL) {
2775 2775 ASSERT(RW_READ_HELD(&->a_rwlock));
2776 2776 anon_index = svd->anon_index + seg_page(seg, addr);
2777 2777 anon_array_enter(amp, anon_index, &cookie);
2778 2778 anon_lock = 1;
2779 2779 }
2780 2780
2781 2781 if (svd->vp == NULL && amp != NULL) {
2782 2782 if ((ap = anon_get_ptr(amp->ahp, anon_index)) == NULL) {
2783 2783 /*
2784 2784 * Allocate a (normally) writable anonymous page of
2785 2785 * zeroes. If no advance reservations, reserve now.
2786 2786 */
2787 2787 if (svd->flags & MAP_NORESERVE) {
2788 2788 if (anon_resv_zone(ptob(1),
2789 2789 seg->s_as->a_proc->p_zone)) {
2790 2790 atomic_add_long(&svd->swresv, ptob(1));
2791 2791 atomic_add_long(&seg->s_as->a_resvsize,
2792 2792 ptob(1));
2793 2793 } else {
2794 2794 err = ENOMEM;
2795 2795 goto out;
2796 2796 }
2797 2797 }
2798 2798 if ((pp = anon_zero(seg, addr, &ap,
2799 2799 svd->cred)) == NULL) {
2800 2800 err = ENOMEM;
2801 2801 goto out; /* out of swap space */
2802 2802 }
2803 2803 /*
2804 2804 * Re-acquire the anon_map lock and
2805 2805 * initialize the anon array entry.
2806 2806 */
2807 2807 (void) anon_set_ptr(amp->ahp, anon_index, ap,
2808 2808 ANON_SLEEP);
2809 2809
2810 2810 ASSERT(pp->p_szc == 0);
2811 2811
2812 2812 /*
2813 2813 * Handle pages that have been marked for migration
2814 2814 */
2815 2815 if (lgrp_optimizations())
2816 2816 page_migrate(seg, addr, &pp, 1);
2817 2817
2818 2818 if (enable_mbit_wa) {
2819 2819 if (rw == S_WRITE)
2820 2820 hat_setmod(pp);
2821 2821 else if (!hat_ismod(pp))
2822 2822 prot &= ~PROT_WRITE;
2823 2823 }
2824 2824 /*
2825 2825 * If AS_PAGLCK is set in a_flags (via memcntl(2)
2826 2826 * with MC_LOCKAS, MCL_FUTURE) and this is a
2827 2827 * MAP_NORESERVE segment, we may need to
2828 2828 * permanently lock the page as it is being faulted
2829 2829 * for the first time. The following text applies
2830 2830 * only to MAP_NORESERVE segments:
2831 2831 *
2832 2832 * As per memcntl(2), if this segment was created
2833 2833 * after MCL_FUTURE was applied (a "future"
2834 2834 * segment), its pages must be locked. If this
2835 2835 * segment existed at MCL_FUTURE application (a
2836 2836 * "past" segment), the interface is unclear.
2837 2837 *
2838 2838 * We decide to lock only if vpage is present:
2839 2839 *
2840 2840 * - "future" segments will have a vpage array (see
2841 2841 * as_map), and so will be locked as required
2842 2842 *
2843 2843 * - "past" segments may not have a vpage array,
2844 2844 * depending on whether events (such as
2845 2845 * mprotect) have occurred. Locking if vpage
2846 2846 * exists will preserve legacy behavior. Not
2847 2847 * locking if vpage is absent, will not break
2848 2848 * the interface or legacy behavior. Note that
2849 2849 * allocating vpage here if it's absent requires
2850 2850 * upgrading the segvn reader lock, the cost of
2851 2851 * which does not seem worthwhile.
2852 2852 *
2853 2853 * Usually testing and setting VPP_ISPPLOCK and
2854 2854 * VPP_SETPPLOCK requires holding the segvn lock as
2855 2855 * writer, but in this case all readers are
2856 2856 * serializing on the anon array lock.
2857 2857 */
2858 2858 if (AS_ISPGLCK(seg->s_as) && vpage != NULL &&
2859 2859 (svd->flags & MAP_NORESERVE) &&
2860 2860 !VPP_ISPPLOCK(vpage)) {
2861 2861 proc_t *p = seg->s_as->a_proc;
2862 2862 ASSERT(svd->type == MAP_PRIVATE);
2863 2863 mutex_enter(&p->p_lock);
2864 2864 if (rctl_incr_locked_mem(p, NULL, PAGESIZE,
2865 2865 1) == 0) {
2866 2866 claim = VPP_PROT(vpage) & PROT_WRITE;
2867 2867 if (page_pp_lock(pp, claim, 0)) {
2868 2868 VPP_SETPPLOCK(vpage);
2869 2869 } else {
2870 2870 rctl_decr_locked_mem(p, NULL,
2871 2871 PAGESIZE, 1);
2872 2872 }
2873 2873 }
2874 2874 mutex_exit(&p->p_lock);
2875 2875 }
2876 2876
2877 2877 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
2878 2878 hat_memload(hat, addr, pp, prot, hat_flag);
2879 2879
2880 2880 if (!(hat_flag & HAT_LOAD_LOCK))
2881 2881 page_unlock(pp);
2882 2882
2883 2883 anon_array_exit(&cookie);
2884 2884 return (0);
2885 2885 }
2886 2886 }
2887 2887
2888 2888 /*
2889 2889 * Obtain the page structure via anon_getpage() if it is
2890 2890 * a private copy of an object (the result of a previous
2891 2891 * copy-on-write).
2892 2892 */
2893 2893 if (amp != NULL) {
2894 2894 if ((ap = anon_get_ptr(amp->ahp, anon_index)) != NULL) {
2895 2895 err = anon_getpage(&ap, &vpprot, anon_pl, PAGESIZE,
2896 2896 seg, addr, rw, svd->cred);
2897 2897 if (err)
2898 2898 goto out;
2899 2899
2900 2900 if (svd->type == MAP_SHARED) {
2901 2901 /*
2902 2902 * If this is a shared mapping to an
2903 2903 * anon_map, then ignore the write
2904 2904 * permissions returned by anon_getpage().
2905 2905 * They apply to the private mappings
2906 2906 * of this anon_map.
2907 2907 */
2908 2908 vpprot |= PROT_WRITE;
2909 2909 }
2910 2910 opp = anon_pl[0];
2911 2911 }
2912 2912 }
2913 2913
2914 2914 /*
2915 2915 * Search the pl[] list passed in if it is from the
2916 2916 * original object (i.e., not a private copy).
2917 2917 */
2918 2918 if (opp == NULL) {
2919 2919 /*
2920 2920 * Find original page. We must be bringing it in
2921 2921 * from the list in pl[].
2922 2922 */
2923 2923 for (ppp = pl; (opp = *ppp) != NULL; ppp++) {
2924 2924 if (opp == PAGE_HANDLED)
2925 2925 continue;
2926 2926 ASSERT(opp->p_vnode == svd->vp); /* XXX */
2927 2927 if (opp->p_offset == off)
2928 2928 break;
2929 2929 }
2930 2930 if (opp == NULL) {
2931 2931 panic("segvn_faultpage not found");
2932 2932 /*NOTREACHED*/
2933 2933 }
2934 2934 *ppp = PAGE_HANDLED;
2935 2935
2936 2936 }
2937 2937
2938 2938 ASSERT(PAGE_LOCKED(opp));
2939 2939
2940 2940 TRACE_3(TR_FAC_VM, TR_SEGVN_FAULT,
2941 2941 "segvn_fault:pp %p vp %p offset %llx", opp, NULL, 0);
2942 2942
2943 2943 /*
2944 2944 * The fault is treated as a copy-on-write fault if a
2945 2945 * write occurs on a private segment and the object
2946 2946 * page (i.e., mapping) is write protected. We assume
2947 2947 * that fatal protection checks have already been made.
2948 2948 */
2949 2949
2950 2950 if (brkcow) {
2951 2951 ASSERT(svd->tr_state == SEGVN_TR_OFF);
2952 2952 cow = !(vpprot & PROT_WRITE);
2953 2953 } else if (svd->tr_state == SEGVN_TR_ON) {
2954 2954 /*
2955 2955 * If we are doing text replication COW on first touch.
2956 2956 */
2957 2957 ASSERT(amp != NULL);
2958 2958 ASSERT(svd->vp != NULL);
2959 2959 ASSERT(rw != S_WRITE);
2960 2960 cow = (ap == NULL);
2961 2961 } else {
2962 2962 cow = 0;
2963 2963 }
2964 2964
2965 2965 /*
2966 2966 * If not a copy-on-write case load the translation
2967 2967 * and return.
2968 2968 */
2969 2969 if (cow == 0) {
2970 2970
2971 2971 /*
2972 2972 * Handle pages that have been marked for migration
2973 2973 */
2974 2974 if (lgrp_optimizations())
2975 2975 page_migrate(seg, addr, &opp, 1);
2976 2976
2977 2977 if (IS_VMODSORT(opp->p_vnode) || enable_mbit_wa) {
2978 2978 if (rw == S_WRITE)
2979 2979 hat_setmod(opp);
2980 2980 else if (rw != S_OTHER && !hat_ismod(opp))
2981 2981 prot &= ~PROT_WRITE;
2982 2982 }
2983 2983
2984 2984 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE ||
2985 2985 (!svd->pageprot && svd->prot == (prot & vpprot)));
2986 2986 ASSERT(amp == NULL ||
2987 2987 svd->rcookie == HAT_INVALID_REGION_COOKIE);
2988 2988 hat_memload_region(hat, addr, opp, prot & vpprot, hat_flag,
2989 2989 svd->rcookie);
2990 2990
2991 2991 if (!(hat_flag & HAT_LOAD_LOCK))
2992 2992 page_unlock(opp);
2993 2993
2994 2994 if (anon_lock) {
2995 2995 anon_array_exit(&cookie);
2996 2996 }
2997 2997 return (0);
2998 2998 }
2999 2999
3000 3000 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
3001 3001
3002 3002 hat_setref(opp);
3003 3003
3004 3004 ASSERT(amp != NULL && anon_lock);
3005 3005
3006 3006 /*
3007 3007 * Steal the page only if it isn't a private page
3008 3008 * since stealing a private page is not worth the effort.
3009 3009 */
3010 3010 if ((ap = anon_get_ptr(amp->ahp, anon_index)) == NULL)
3011 3011 steal = 1;
3012 3012
3013 3013 /*
3014 3014 * Steal the original page if the following conditions are true:
3015 3015 *
3016 3016 * We are low on memory, the page is not private, page is not large,
3017 3017 * not shared, not modified, not `locked' or if we have it `locked'
3018 3018 * (i.e., p_cowcnt == 1 and p_lckcnt == 0, which also implies
3019 3019 * that the page is not shared) and if it doesn't have any
3020 3020 * translations. page_struct_lock isn't needed to look at p_cowcnt
3021 3021 * and p_lckcnt because we first get exclusive lock on page.
3022 3022 */
3023 3023 (void) hat_pagesync(opp, HAT_SYNC_DONTZERO | HAT_SYNC_STOPON_MOD);
3024 3024
3025 3025 if (stealcow && freemem < minfree && steal && opp->p_szc == 0 &&
3026 3026 page_tryupgrade(opp) && !hat_ismod(opp) &&
3027 3027 ((opp->p_lckcnt == 0 && opp->p_cowcnt == 0) ||
3028 3028 (opp->p_lckcnt == 0 && opp->p_cowcnt == 1 &&
3029 3029 vpage != NULL && VPP_ISPPLOCK(vpage)))) {
3030 3030 /*
3031 3031 * Check if this page has other translations
3032 3032 * after unloading our translation.
3033 3033 */
3034 3034 if (hat_page_is_mapped(opp)) {
3035 3035 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
3036 3036 hat_unload(seg->s_as->a_hat, addr, PAGESIZE,
3037 3037 HAT_UNLOAD);
3038 3038 }
3039 3039
3040 3040 /*
3041 3041 * hat_unload() might sync back someone else's recent
3042 3042 * modification, so check again.
3043 3043 */
3044 3044 if (!hat_ismod(opp) && !hat_page_is_mapped(opp))
3045 3045 pageflags |= STEAL_PAGE;
3046 3046 }
3047 3047
3048 3048 /*
3049 3049 * If we have a vpage pointer, see if it indicates that we have
3050 3050 * ``locked'' the page we map -- if so, tell anon_private to
3051 3051 * transfer the locking resource to the new page.
3052 3052 *
3053 3053 * See Statement at the beginning of segvn_lockop regarding
3054 3054 * the way lockcnts/cowcnts are handled during COW.
3055 3055 *
3056 3056 */
3057 3057 if (vpage != NULL && VPP_ISPPLOCK(vpage))
3058 3058 pageflags |= LOCK_PAGE;
3059 3059
3060 3060 /*
3061 3061 * Allocate a private page and perform the copy.
3062 3062 * For MAP_NORESERVE reserve swap space now, unless this
3063 3063 * is a cow fault on an existing anon page in which case
3064 3064 * MAP_NORESERVE will have made advance reservations.
3065 3065 */
3066 3066 if ((svd->flags & MAP_NORESERVE) && (ap == NULL)) {
3067 3067 if (anon_resv_zone(ptob(1), seg->s_as->a_proc->p_zone)) {
3068 3068 atomic_add_long(&svd->swresv, ptob(1));
3069 3069 atomic_add_long(&seg->s_as->a_resvsize, ptob(1));
3070 3070 } else {
3071 3071 page_unlock(opp);
3072 3072 err = ENOMEM;
3073 3073 goto out;
3074 3074 }
3075 3075 }
3076 3076 oldap = ap;
3077 3077 pp = anon_private(&ap, seg, addr, prot, opp, pageflags, svd->cred);
3078 3078 if (pp == NULL) {
3079 3079 err = ENOMEM; /* out of swap space */
3080 3080 goto out;
3081 3081 }
3082 3082
3083 3083 /*
3084 3084 * If we copied away from an anonymous page, then
3085 3085 * we are one step closer to freeing up an anon slot.
3086 3086 *
3087 3087 * NOTE: The original anon slot must be released while
3088 3088 * holding the "anon_map" lock. This is necessary to prevent
3089 3089 * other threads from obtaining a pointer to the anon slot
3090 3090 * which may be freed if its "refcnt" is 1.
3091 3091 */
3092 3092 if (oldap != NULL)
3093 3093 anon_decref(oldap);
3094 3094
3095 3095 (void) anon_set_ptr(amp->ahp, anon_index, ap, ANON_SLEEP);
3096 3096
3097 3097 /*
3098 3098 * Handle pages that have been marked for migration
3099 3099 */
3100 3100 if (lgrp_optimizations())
3101 3101 page_migrate(seg, addr, &pp, 1);
3102 3102
3103 3103 ASSERT(pp->p_szc == 0);
3104 3104
3105 3105 ASSERT(!IS_VMODSORT(pp->p_vnode));
3106 3106 if (enable_mbit_wa) {
3107 3107 if (rw == S_WRITE)
3108 3108 hat_setmod(pp);
3109 3109 else if (!hat_ismod(pp))
3110 3110 prot &= ~PROT_WRITE;
3111 3111 }
3112 3112
3113 3113 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
3114 3114 hat_memload(hat, addr, pp, prot, hat_flag);
3115 3115
3116 3116 if (!(hat_flag & HAT_LOAD_LOCK))
3117 3117 page_unlock(pp);
3118 3118
3119 3119 ASSERT(anon_lock);
3120 3120 anon_array_exit(&cookie);
3121 3121 return (0);
3122 3122 out:
3123 3123 if (anon_lock)
3124 3124 anon_array_exit(&cookie);
3125 3125
3126 3126 if (type == F_SOFTLOCK) {
3127 3127 atomic_dec_ulong((ulong_t *)&svd->softlockcnt);
3128 3128 }
3129 3129 return (FC_MAKE_ERR(err));
3130 3130 }
3131 3131
3132 3132 /*
3133 3133 * relocate a bunch of smaller targ pages into one large repl page. all targ
3134 3134 * pages must be complete pages smaller than replacement pages.
3135 3135 * it's assumed that no page's szc can change since they are all PAGESIZE or
3136 3136 * complete large pages locked SHARED.
3137 3137 */
3138 3138 static void
3139 3139 segvn_relocate_pages(page_t **targ, page_t *replacement)
3140 3140 {
3141 3141 page_t *pp;
3142 3142 pgcnt_t repl_npgs, curnpgs;
3143 3143 pgcnt_t i;
3144 3144 uint_t repl_szc = replacement->p_szc;
3145 3145 page_t *first_repl = replacement;
3146 3146 page_t *repl;
3147 3147 spgcnt_t npgs;
3148 3148
3149 3149 VM_STAT_ADD(segvnvmstats.relocatepages[0]);
3150 3150
3151 3151 ASSERT(repl_szc != 0);
3152 3152 npgs = repl_npgs = page_get_pagecnt(repl_szc);
3153 3153
3154 3154 i = 0;
3155 3155 while (repl_npgs) {
3156 3156 spgcnt_t nreloc;
3157 3157 int err;
3158 3158 ASSERT(replacement != NULL);
3159 3159 pp = targ[i];
3160 3160 ASSERT(pp->p_szc < repl_szc);
3161 3161 ASSERT(PAGE_EXCL(pp));
3162 3162 ASSERT(!PP_ISFREE(pp));
3163 3163 curnpgs = page_get_pagecnt(pp->p_szc);
3164 3164 if (curnpgs == 1) {
3165 3165 VM_STAT_ADD(segvnvmstats.relocatepages[1]);
3166 3166 repl = replacement;
3167 3167 page_sub(&replacement, repl);
3168 3168 ASSERT(PAGE_EXCL(repl));
3169 3169 ASSERT(!PP_ISFREE(repl));
3170 3170 ASSERT(repl->p_szc == repl_szc);
3171 3171 } else {
3172 3172 page_t *repl_savepp;
3173 3173 int j;
3174 3174 VM_STAT_ADD(segvnvmstats.relocatepages[2]);
3175 3175 repl_savepp = replacement;
3176 3176 for (j = 0; j < curnpgs; j++) {
3177 3177 repl = replacement;
3178 3178 page_sub(&replacement, repl);
3179 3179 ASSERT(PAGE_EXCL(repl));
3180 3180 ASSERT(!PP_ISFREE(repl));
3181 3181 ASSERT(repl->p_szc == repl_szc);
3182 3182 ASSERT(page_pptonum(targ[i + j]) ==
3183 3183 page_pptonum(targ[i]) + j);
3184 3184 }
3185 3185 repl = repl_savepp;
3186 3186 ASSERT(IS_P2ALIGNED(page_pptonum(repl), curnpgs));
3187 3187 }
3188 3188 err = page_relocate(&pp, &repl, 0, 1, &nreloc, NULL);
3189 3189 if (err || nreloc != curnpgs) {
3190 3190 panic("segvn_relocate_pages: "
3191 3191 "page_relocate failed err=%d curnpgs=%ld "
3192 3192 "nreloc=%ld", err, curnpgs, nreloc);
3193 3193 }
3194 3194 ASSERT(curnpgs <= repl_npgs);
3195 3195 repl_npgs -= curnpgs;
3196 3196 i += curnpgs;
3197 3197 }
3198 3198 ASSERT(replacement == NULL);
3199 3199
3200 3200 repl = first_repl;
3201 3201 repl_npgs = npgs;
3202 3202 for (i = 0; i < repl_npgs; i++) {
3203 3203 ASSERT(PAGE_EXCL(repl));
3204 3204 ASSERT(!PP_ISFREE(repl));
3205 3205 targ[i] = repl;
3206 3206 page_downgrade(targ[i]);
3207 3207 repl++;
3208 3208 }
3209 3209 }
3210 3210
3211 3211 /*
3212 3212 * Check if all pages in ppa array are complete smaller than szc pages and
3213 3213 * their roots will still be aligned relative to their current size if the
3214 3214 * entire ppa array is relocated into one szc page. If these conditions are
3215 3215 * not met return 0.
3216 3216 *
3217 3217 * If all pages are properly aligned attempt to upgrade their locks
3218 3218 * to exclusive mode. If it fails set *upgrdfail to 1 and return 0.
3219 3219 * upgrdfail was set to 0 by caller.
3220 3220 *
3221 3221 * Return 1 if all pages are aligned and locked exclusively.
3222 3222 *
3223 3223 * If all pages in ppa array happen to be physically contiguous to make one
3224 3224 * szc page and all exclusive locks are successfully obtained promote the page
3225 3225 * size to szc and set *pszc to szc. Return 1 with pages locked shared.
3226 3226 */
3227 3227 static int
3228 3228 segvn_full_szcpages(page_t **ppa, uint_t szc, int *upgrdfail, uint_t *pszc)
3229 3229 {
3230 3230 page_t *pp;
3231 3231 pfn_t pfn;
3232 3232 pgcnt_t totnpgs = page_get_pagecnt(szc);
3233 3233 pfn_t first_pfn;
3234 3234 int contig = 1;
3235 3235 pgcnt_t i;
3236 3236 pgcnt_t j;
3237 3237 uint_t curszc;
3238 3238 pgcnt_t curnpgs;
3239 3239 int root = 0;
3240 3240
3241 3241 ASSERT(szc > 0);
3242 3242
3243 3243 VM_STAT_ADD(segvnvmstats.fullszcpages[0]);
3244 3244
3245 3245 for (i = 0; i < totnpgs; i++) {
3246 3246 pp = ppa[i];
3247 3247 ASSERT(PAGE_SHARED(pp));
3248 3248 ASSERT(!PP_ISFREE(pp));
3249 3249 pfn = page_pptonum(pp);
3250 3250 if (i == 0) {
3251 3251 if (!IS_P2ALIGNED(pfn, totnpgs)) {
3252 3252 contig = 0;
3253 3253 } else {
3254 3254 first_pfn = pfn;
3255 3255 }
3256 3256 } else if (contig && pfn != first_pfn + i) {
3257 3257 contig = 0;
3258 3258 }
3259 3259 if (pp->p_szc == 0) {
3260 3260 if (root) {
3261 3261 VM_STAT_ADD(segvnvmstats.fullszcpages[1]);
3262 3262 return (0);
3263 3263 }
3264 3264 } else if (!root) {
3265 3265 if ((curszc = pp->p_szc) >= szc) {
3266 3266 VM_STAT_ADD(segvnvmstats.fullszcpages[2]);
3267 3267 return (0);
3268 3268 }
3269 3269 if (curszc == 0) {
3270 3270 /*
3271 3271 * p_szc changed means we don't have all pages
3272 3272 * locked. return failure.
3273 3273 */
3274 3274 VM_STAT_ADD(segvnvmstats.fullszcpages[3]);
3275 3275 return (0);
3276 3276 }
3277 3277 curnpgs = page_get_pagecnt(curszc);
3278 3278 if (!IS_P2ALIGNED(pfn, curnpgs) ||
3279 3279 !IS_P2ALIGNED(i, curnpgs)) {
3280 3280 VM_STAT_ADD(segvnvmstats.fullszcpages[4]);
3281 3281 return (0);
3282 3282 }
3283 3283 root = 1;
3284 3284 } else {
3285 3285 ASSERT(i > 0);
3286 3286 VM_STAT_ADD(segvnvmstats.fullszcpages[5]);
3287 3287 if (pp->p_szc != curszc) {
3288 3288 VM_STAT_ADD(segvnvmstats.fullszcpages[6]);
3289 3289 return (0);
3290 3290 }
3291 3291 if (pfn - 1 != page_pptonum(ppa[i - 1])) {
3292 3292 panic("segvn_full_szcpages: "
3293 3293 "large page not physically contiguous");
3294 3294 }
3295 3295 if (P2PHASE(pfn, curnpgs) == curnpgs - 1) {
3296 3296 root = 0;
3297 3297 }
3298 3298 }
3299 3299 }
3300 3300
3301 3301 for (i = 0; i < totnpgs; i++) {
3302 3302 ASSERT(ppa[i]->p_szc < szc);
3303 3303 if (!page_tryupgrade(ppa[i])) {
3304 3304 for (j = 0; j < i; j++) {
3305 3305 page_downgrade(ppa[j]);
3306 3306 }
3307 3307 *pszc = ppa[i]->p_szc;
3308 3308 *upgrdfail = 1;
3309 3309 VM_STAT_ADD(segvnvmstats.fullszcpages[7]);
3310 3310 return (0);
3311 3311 }
3312 3312 }
3313 3313
3314 3314 /*
3315 3315 * When a page is put a free cachelist its szc is set to 0. if file
3316 3316 * system reclaimed pages from cachelist targ pages will be physically
3317 3317 * contiguous with 0 p_szc. in this case just upgrade szc of targ
3318 3318 * pages without any relocations.
3319 3319 * To avoid any hat issues with previous small mappings
3320 3320 * hat_pageunload() the target pages first.
3321 3321 */
3322 3322 if (contig) {
3323 3323 VM_STAT_ADD(segvnvmstats.fullszcpages[8]);
3324 3324 for (i = 0; i < totnpgs; i++) {
3325 3325 (void) hat_pageunload(ppa[i], HAT_FORCE_PGUNLOAD);
3326 3326 }
3327 3327 for (i = 0; i < totnpgs; i++) {
3328 3328 ppa[i]->p_szc = szc;
3329 3329 }
3330 3330 for (i = 0; i < totnpgs; i++) {
3331 3331 ASSERT(PAGE_EXCL(ppa[i]));
3332 3332 page_downgrade(ppa[i]);
3333 3333 }
3334 3334 if (pszc != NULL) {
3335 3335 *pszc = szc;
3336 3336 }
3337 3337 }
3338 3338 VM_STAT_ADD(segvnvmstats.fullszcpages[9]);
3339 3339 return (1);
3340 3340 }
3341 3341
3342 3342 /*
3343 3343 * Create physically contiguous pages for [vp, off] - [vp, off +
3344 3344 * page_size(szc)) range and for private segment return them in ppa array.
3345 3345 * Pages are created either via IO or relocations.
3346 3346 *
3347 3347 * Return 1 on success and 0 on failure.
3348 3348 *
3349 3349 * If physically contiguous pages already exist for this range return 1 without
3350 3350 * filling ppa array. Caller initializes ppa[0] as NULL to detect that ppa
3351 3351 * array wasn't filled. In this case caller fills ppa array via VOP_GETPAGE().
3352 3352 */
3353 3353
3354 3354 static int
3355 3355 segvn_fill_vp_pages(struct segvn_data *svd, vnode_t *vp, u_offset_t off,
3356 3356 uint_t szc, page_t **ppa, page_t **ppplist, uint_t *ret_pszc,
3357 3357 int *downsize)
3358 3358
3359 3359 {
3360 3360 page_t *pplist = *ppplist;
3361 3361 size_t pgsz = page_get_pagesize(szc);
3362 3362 pgcnt_t pages = btop(pgsz);
3363 3363 ulong_t start_off = off;
3364 3364 u_offset_t eoff = off + pgsz;
3365 3365 spgcnt_t nreloc;
3366 3366 u_offset_t io_off = off;
3367 3367 size_t io_len;
3368 3368 page_t *io_pplist = NULL;
3369 3369 page_t *done_pplist = NULL;
3370 3370 pgcnt_t pgidx = 0;
3371 3371 page_t *pp;
3372 3372 page_t *newpp;
3373 3373 page_t *targpp;
3374 3374 int io_err = 0;
3375 3375 int i;
3376 3376 pfn_t pfn;
3377 3377 ulong_t ppages;
3378 3378 page_t *targ_pplist = NULL;
3379 3379 page_t *repl_pplist = NULL;
3380 3380 page_t *tmp_pplist;
3381 3381 int nios = 0;
3382 3382 uint_t pszc;
3383 3383 struct vattr va;
3384 3384
3385 3385 VM_STAT_ADD(segvnvmstats.fill_vp_pages[0]);
3386 3386
3387 3387 ASSERT(szc != 0);
3388 3388 ASSERT(pplist->p_szc == szc);
3389 3389
3390 3390 /*
3391 3391 * downsize will be set to 1 only if we fail to lock pages. this will
3392 3392 * allow subsequent faults to try to relocate the page again. If we
3393 3393 * fail due to misalignment don't downsize and let the caller map the
3394 3394 * whole region with small mappings to avoid more faults into the area
3395 3395 * where we can't get large pages anyway.
3396 3396 */
3397 3397 *downsize = 0;
3398 3398
3399 3399 while (off < eoff) {
3400 3400 newpp = pplist;
3401 3401 ASSERT(newpp != NULL);
3402 3402 ASSERT(PAGE_EXCL(newpp));
3403 3403 ASSERT(!PP_ISFREE(newpp));
3404 3404 /*
3405 3405 * we pass NULL for nrelocp to page_lookup_create()
3406 3406 * so that it doesn't relocate. We relocate here
3407 3407 * later only after we make sure we can lock all
3408 3408 * pages in the range we handle and they are all
3409 3409 * aligned.
3410 3410 */
3411 3411 pp = page_lookup_create(vp, off, SE_SHARED, newpp, NULL, 0);
3412 3412 ASSERT(pp != NULL);
3413 3413 ASSERT(!PP_ISFREE(pp));
3414 3414 ASSERT(pp->p_vnode == vp);
3415 3415 ASSERT(pp->p_offset == off);
3416 3416 if (pp == newpp) {
3417 3417 VM_STAT_ADD(segvnvmstats.fill_vp_pages[1]);
3418 3418 page_sub(&pplist, pp);
3419 3419 ASSERT(PAGE_EXCL(pp));
3420 3420 ASSERT(page_iolock_assert(pp));
3421 3421 page_list_concat(&io_pplist, &pp);
3422 3422 off += PAGESIZE;
3423 3423 continue;
3424 3424 }
3425 3425 VM_STAT_ADD(segvnvmstats.fill_vp_pages[2]);
3426 3426 pfn = page_pptonum(pp);
3427 3427 pszc = pp->p_szc;
3428 3428 if (pszc >= szc && targ_pplist == NULL && io_pplist == NULL &&
3429 3429 IS_P2ALIGNED(pfn, pages)) {
3430 3430 ASSERT(repl_pplist == NULL);
3431 3431 ASSERT(done_pplist == NULL);
3432 3432 ASSERT(pplist == *ppplist);
3433 3433 page_unlock(pp);
3434 3434 page_free_replacement_page(pplist);
3435 3435 page_create_putback(pages);
3436 3436 *ppplist = NULL;
3437 3437 VM_STAT_ADD(segvnvmstats.fill_vp_pages[3]);
3438 3438 return (1);
3439 3439 }
3440 3440 if (pszc >= szc) {
3441 3441 page_unlock(pp);
3442 3442 segvn_faultvnmpss_align_err1++;
3443 3443 goto out;
3444 3444 }
3445 3445 ppages = page_get_pagecnt(pszc);
3446 3446 if (!IS_P2ALIGNED(pfn, ppages)) {
3447 3447 ASSERT(pszc > 0);
3448 3448 /*
3449 3449 * sizing down to pszc won't help.
3450 3450 */
3451 3451 page_unlock(pp);
3452 3452 segvn_faultvnmpss_align_err2++;
3453 3453 goto out;
3454 3454 }
3455 3455 pfn = page_pptonum(newpp);
3456 3456 if (!IS_P2ALIGNED(pfn, ppages)) {
3457 3457 ASSERT(pszc > 0);
3458 3458 /*
3459 3459 * sizing down to pszc won't help.
3460 3460 */
3461 3461 page_unlock(pp);
3462 3462 segvn_faultvnmpss_align_err3++;
3463 3463 goto out;
3464 3464 }
3465 3465 if (!PAGE_EXCL(pp)) {
3466 3466 VM_STAT_ADD(segvnvmstats.fill_vp_pages[4]);
3467 3467 page_unlock(pp);
3468 3468 *downsize = 1;
3469 3469 *ret_pszc = pp->p_szc;
3470 3470 goto out;
3471 3471 }
3472 3472 targpp = pp;
3473 3473 if (io_pplist != NULL) {
3474 3474 VM_STAT_ADD(segvnvmstats.fill_vp_pages[5]);
3475 3475 io_len = off - io_off;
3476 3476 /*
3477 3477 * Some file systems like NFS don't check EOF
3478 3478 * conditions in VOP_PAGEIO(). Check it here
3479 3479 * now that pages are locked SE_EXCL. Any file
3480 3480 * truncation will wait until the pages are
3481 3481 * unlocked so no need to worry that file will
3482 3482 * be truncated after we check its size here.
3483 3483 * XXX fix NFS to remove this check.
3484 3484 */
3485 3485 va.va_mask = AT_SIZE;
3486 3486 if (VOP_GETATTR(vp, &va, ATTR_HINT, svd->cred, NULL)) {
3487 3487 VM_STAT_ADD(segvnvmstats.fill_vp_pages[6]);
3488 3488 page_unlock(targpp);
3489 3489 goto out;
3490 3490 }
3491 3491 if (btopr(va.va_size) < btopr(io_off + io_len)) {
3492 3492 VM_STAT_ADD(segvnvmstats.fill_vp_pages[7]);
3493 3493 *downsize = 1;
3494 3494 *ret_pszc = 0;
3495 3495 page_unlock(targpp);
3496 3496 goto out;
3497 3497 }
3498 3498 io_err = VOP_PAGEIO(vp, io_pplist, io_off, io_len,
3499 3499 B_READ, svd->cred, NULL);
3500 3500 if (io_err) {
3501 3501 VM_STAT_ADD(segvnvmstats.fill_vp_pages[8]);
3502 3502 page_unlock(targpp);
3503 3503 if (io_err == EDEADLK) {
3504 3504 segvn_vmpss_pageio_deadlk_err++;
3505 3505 }
3506 3506 goto out;
3507 3507 }
3508 3508 nios++;
3509 3509 VM_STAT_ADD(segvnvmstats.fill_vp_pages[9]);
3510 3510 while (io_pplist != NULL) {
3511 3511 pp = io_pplist;
3512 3512 page_sub(&io_pplist, pp);
3513 3513 ASSERT(page_iolock_assert(pp));
3514 3514 page_io_unlock(pp);
3515 3515 pgidx = (pp->p_offset - start_off) >>
3516 3516 PAGESHIFT;
3517 3517 ASSERT(pgidx < pages);
3518 3518 ppa[pgidx] = pp;
3519 3519 page_list_concat(&done_pplist, &pp);
3520 3520 }
3521 3521 }
3522 3522 pp = targpp;
3523 3523 ASSERT(PAGE_EXCL(pp));
3524 3524 ASSERT(pp->p_szc <= pszc);
3525 3525 if (pszc != 0 && !group_page_trylock(pp, SE_EXCL)) {
3526 3526 VM_STAT_ADD(segvnvmstats.fill_vp_pages[10]);
3527 3527 page_unlock(pp);
3528 3528 *downsize = 1;
3529 3529 *ret_pszc = pp->p_szc;
3530 3530 goto out;
3531 3531 }
3532 3532 VM_STAT_ADD(segvnvmstats.fill_vp_pages[11]);
3533 3533 /*
3534 3534 * page szc chould have changed before the entire group was
3535 3535 * locked. reread page szc.
3536 3536 */
3537 3537 pszc = pp->p_szc;
3538 3538 ppages = page_get_pagecnt(pszc);
3539 3539
3540 3540 /* link just the roots */
3541 3541 page_list_concat(&targ_pplist, &pp);
3542 3542 page_sub(&pplist, newpp);
3543 3543 page_list_concat(&repl_pplist, &newpp);
3544 3544 off += PAGESIZE;
3545 3545 while (--ppages != 0) {
3546 3546 newpp = pplist;
3547 3547 page_sub(&pplist, newpp);
3548 3548 off += PAGESIZE;
3549 3549 }
3550 3550 io_off = off;
3551 3551 }
3552 3552 if (io_pplist != NULL) {
3553 3553 VM_STAT_ADD(segvnvmstats.fill_vp_pages[12]);
3554 3554 io_len = eoff - io_off;
3555 3555 va.va_mask = AT_SIZE;
3556 3556 if (VOP_GETATTR(vp, &va, ATTR_HINT, svd->cred, NULL) != 0) {
3557 3557 VM_STAT_ADD(segvnvmstats.fill_vp_pages[13]);
3558 3558 goto out;
3559 3559 }
3560 3560 if (btopr(va.va_size) < btopr(io_off + io_len)) {
3561 3561 VM_STAT_ADD(segvnvmstats.fill_vp_pages[14]);
3562 3562 *downsize = 1;
3563 3563 *ret_pszc = 0;
3564 3564 goto out;
3565 3565 }
3566 3566 io_err = VOP_PAGEIO(vp, io_pplist, io_off, io_len,
3567 3567 B_READ, svd->cred, NULL);
3568 3568 if (io_err) {
3569 3569 VM_STAT_ADD(segvnvmstats.fill_vp_pages[15]);
3570 3570 if (io_err == EDEADLK) {
3571 3571 segvn_vmpss_pageio_deadlk_err++;
3572 3572 }
3573 3573 goto out;
3574 3574 }
3575 3575 nios++;
3576 3576 while (io_pplist != NULL) {
3577 3577 pp = io_pplist;
3578 3578 page_sub(&io_pplist, pp);
3579 3579 ASSERT(page_iolock_assert(pp));
3580 3580 page_io_unlock(pp);
3581 3581 pgidx = (pp->p_offset - start_off) >> PAGESHIFT;
3582 3582 ASSERT(pgidx < pages);
3583 3583 ppa[pgidx] = pp;
3584 3584 }
3585 3585 }
3586 3586 /*
3587 3587 * we're now bound to succeed or panic.
3588 3588 * remove pages from done_pplist. it's not needed anymore.
3589 3589 */
3590 3590 while (done_pplist != NULL) {
3591 3591 pp = done_pplist;
3592 3592 page_sub(&done_pplist, pp);
3593 3593 }
3594 3594 VM_STAT_ADD(segvnvmstats.fill_vp_pages[16]);
3595 3595 ASSERT(pplist == NULL);
3596 3596 *ppplist = NULL;
3597 3597 while (targ_pplist != NULL) {
3598 3598 int ret;
3599 3599 VM_STAT_ADD(segvnvmstats.fill_vp_pages[17]);
3600 3600 ASSERT(repl_pplist);
3601 3601 pp = targ_pplist;
3602 3602 page_sub(&targ_pplist, pp);
3603 3603 pgidx = (pp->p_offset - start_off) >> PAGESHIFT;
3604 3604 newpp = repl_pplist;
3605 3605 page_sub(&repl_pplist, newpp);
3606 3606 #ifdef DEBUG
3607 3607 pfn = page_pptonum(pp);
3608 3608 pszc = pp->p_szc;
3609 3609 ppages = page_get_pagecnt(pszc);
3610 3610 ASSERT(IS_P2ALIGNED(pfn, ppages));
3611 3611 pfn = page_pptonum(newpp);
3612 3612 ASSERT(IS_P2ALIGNED(pfn, ppages));
3613 3613 ASSERT(P2PHASE(pfn, pages) == pgidx);
3614 3614 #endif
3615 3615 nreloc = 0;
3616 3616 ret = page_relocate(&pp, &newpp, 0, 1, &nreloc, NULL);
3617 3617 if (ret != 0 || nreloc == 0) {
3618 3618 panic("segvn_fill_vp_pages: "
3619 3619 "page_relocate failed");
3620 3620 }
3621 3621 pp = newpp;
3622 3622 while (nreloc-- != 0) {
3623 3623 ASSERT(PAGE_EXCL(pp));
3624 3624 ASSERT(pp->p_vnode == vp);
3625 3625 ASSERT(pgidx ==
3626 3626 ((pp->p_offset - start_off) >> PAGESHIFT));
3627 3627 ppa[pgidx++] = pp;
3628 3628 pp++;
3629 3629 }
3630 3630 }
3631 3631
3632 3632 if (svd->type == MAP_PRIVATE) {
3633 3633 VM_STAT_ADD(segvnvmstats.fill_vp_pages[18]);
3634 3634 for (i = 0; i < pages; i++) {
3635 3635 ASSERT(ppa[i] != NULL);
3636 3636 ASSERT(PAGE_EXCL(ppa[i]));
3637 3637 ASSERT(ppa[i]->p_vnode == vp);
3638 3638 ASSERT(ppa[i]->p_offset ==
3639 3639 start_off + (i << PAGESHIFT));
3640 3640 page_downgrade(ppa[i]);
3641 3641 }
3642 3642 ppa[pages] = NULL;
3643 3643 } else {
3644 3644 VM_STAT_ADD(segvnvmstats.fill_vp_pages[19]);
3645 3645 /*
3646 3646 * the caller will still call VOP_GETPAGE() for shared segments
3647 3647 * to check FS write permissions. For private segments we map
3648 3648 * file read only anyway. so no VOP_GETPAGE is needed.
3649 3649 */
3650 3650 for (i = 0; i < pages; i++) {
3651 3651 ASSERT(ppa[i] != NULL);
3652 3652 ASSERT(PAGE_EXCL(ppa[i]));
3653 3653 ASSERT(ppa[i]->p_vnode == vp);
3654 3654 ASSERT(ppa[i]->p_offset ==
3655 3655 start_off + (i << PAGESHIFT));
3656 3656 page_unlock(ppa[i]);
3657 3657 }
3658 3658 ppa[0] = NULL;
3659 3659 }
3660 3660
3661 3661 return (1);
3662 3662 out:
3663 3663 /*
3664 3664 * Do the cleanup. Unlock target pages we didn't relocate. They are
3665 3665 * linked on targ_pplist by root pages. reassemble unused replacement
3666 3666 * and io pages back to pplist.
3667 3667 */
3668 3668 if (io_pplist != NULL) {
3669 3669 VM_STAT_ADD(segvnvmstats.fill_vp_pages[20]);
3670 3670 pp = io_pplist;
3671 3671 do {
3672 3672 ASSERT(pp->p_vnode == vp);
3673 3673 ASSERT(pp->p_offset == io_off);
3674 3674 ASSERT(page_iolock_assert(pp));
3675 3675 page_io_unlock(pp);
3676 3676 page_hashout(pp, NULL);
3677 3677 io_off += PAGESIZE;
3678 3678 } while ((pp = pp->p_next) != io_pplist);
3679 3679 page_list_concat(&io_pplist, &pplist);
3680 3680 pplist = io_pplist;
3681 3681 }
3682 3682 tmp_pplist = NULL;
3683 3683 while (targ_pplist != NULL) {
3684 3684 VM_STAT_ADD(segvnvmstats.fill_vp_pages[21]);
3685 3685 pp = targ_pplist;
3686 3686 ASSERT(PAGE_EXCL(pp));
3687 3687 page_sub(&targ_pplist, pp);
3688 3688
3689 3689 pszc = pp->p_szc;
3690 3690 ppages = page_get_pagecnt(pszc);
3691 3691 ASSERT(IS_P2ALIGNED(page_pptonum(pp), ppages));
3692 3692
3693 3693 if (pszc != 0) {
3694 3694 group_page_unlock(pp);
3695 3695 }
3696 3696 page_unlock(pp);
3697 3697
3698 3698 pp = repl_pplist;
3699 3699 ASSERT(pp != NULL);
3700 3700 ASSERT(PAGE_EXCL(pp));
3701 3701 ASSERT(pp->p_szc == szc);
3702 3702 page_sub(&repl_pplist, pp);
3703 3703
3704 3704 ASSERT(IS_P2ALIGNED(page_pptonum(pp), ppages));
3705 3705
3706 3706 /* relink replacement page */
3707 3707 page_list_concat(&tmp_pplist, &pp);
3708 3708 while (--ppages != 0) {
3709 3709 VM_STAT_ADD(segvnvmstats.fill_vp_pages[22]);
3710 3710 pp++;
3711 3711 ASSERT(PAGE_EXCL(pp));
3712 3712 ASSERT(pp->p_szc == szc);
3713 3713 page_list_concat(&tmp_pplist, &pp);
3714 3714 }
3715 3715 }
3716 3716 if (tmp_pplist != NULL) {
3717 3717 VM_STAT_ADD(segvnvmstats.fill_vp_pages[23]);
3718 3718 page_list_concat(&tmp_pplist, &pplist);
3719 3719 pplist = tmp_pplist;
3720 3720 }
3721 3721 /*
3722 3722 * at this point all pages are either on done_pplist or
3723 3723 * pplist. They can't be all on done_pplist otherwise
3724 3724 * we'd've been done.
3725 3725 */
3726 3726 ASSERT(pplist != NULL);
3727 3727 if (nios != 0) {
3728 3728 VM_STAT_ADD(segvnvmstats.fill_vp_pages[24]);
3729 3729 pp = pplist;
3730 3730 do {
3731 3731 VM_STAT_ADD(segvnvmstats.fill_vp_pages[25]);
3732 3732 ASSERT(pp->p_szc == szc);
3733 3733 ASSERT(PAGE_EXCL(pp));
3734 3734 ASSERT(pp->p_vnode != vp);
3735 3735 pp->p_szc = 0;
3736 3736 } while ((pp = pp->p_next) != pplist);
3737 3737
3738 3738 pp = done_pplist;
3739 3739 do {
3740 3740 VM_STAT_ADD(segvnvmstats.fill_vp_pages[26]);
3741 3741 ASSERT(pp->p_szc == szc);
3742 3742 ASSERT(PAGE_EXCL(pp));
3743 3743 ASSERT(pp->p_vnode == vp);
3744 3744 pp->p_szc = 0;
3745 3745 } while ((pp = pp->p_next) != done_pplist);
3746 3746
3747 3747 while (pplist != NULL) {
3748 3748 VM_STAT_ADD(segvnvmstats.fill_vp_pages[27]);
3749 3749 pp = pplist;
3750 3750 page_sub(&pplist, pp);
3751 3751 page_free(pp, 0);
3752 3752 }
3753 3753
3754 3754 while (done_pplist != NULL) {
3755 3755 VM_STAT_ADD(segvnvmstats.fill_vp_pages[28]);
3756 3756 pp = done_pplist;
3757 3757 page_sub(&done_pplist, pp);
3758 3758 page_unlock(pp);
3759 3759 }
3760 3760 *ppplist = NULL;
3761 3761 return (0);
3762 3762 }
3763 3763 ASSERT(pplist == *ppplist);
3764 3764 if (io_err) {
3765 3765 VM_STAT_ADD(segvnvmstats.fill_vp_pages[29]);
3766 3766 /*
3767 3767 * don't downsize on io error.
3768 3768 * see if vop_getpage succeeds.
3769 3769 * pplist may still be used in this case
3770 3770 * for relocations.
3771 3771 */
3772 3772 return (0);
3773 3773 }
3774 3774 VM_STAT_ADD(segvnvmstats.fill_vp_pages[30]);
3775 3775 page_free_replacement_page(pplist);
3776 3776 page_create_putback(pages);
3777 3777 *ppplist = NULL;
3778 3778 return (0);
3779 3779 }
3780 3780
3781 3781 int segvn_anypgsz = 0;
3782 3782
3783 3783 #define SEGVN_RESTORE_SOFTLOCK_VP(type, pages) \
3784 3784 if ((type) == F_SOFTLOCK) { \
3785 3785 atomic_add_long((ulong_t *)&(svd)->softlockcnt, \
3786 3786 -(pages)); \
3787 3787 }
3788 3788
3789 3789 #define SEGVN_UPDATE_MODBITS(ppa, pages, rw, prot, vpprot) \
3790 3790 if (IS_VMODSORT((ppa)[0]->p_vnode)) { \
3791 3791 if ((rw) == S_WRITE) { \
3792 3792 for (i = 0; i < (pages); i++) { \
3793 3793 ASSERT((ppa)[i]->p_vnode == \
3794 3794 (ppa)[0]->p_vnode); \
3795 3795 hat_setmod((ppa)[i]); \
3796 3796 } \
3797 3797 } else if ((rw) != S_OTHER && \
3798 3798 ((prot) & (vpprot) & PROT_WRITE)) { \
3799 3799 for (i = 0; i < (pages); i++) { \
3800 3800 ASSERT((ppa)[i]->p_vnode == \
3801 3801 (ppa)[0]->p_vnode); \
3802 3802 if (!hat_ismod((ppa)[i])) { \
3803 3803 prot &= ~PROT_WRITE; \
3804 3804 break; \
3805 3805 } \
3806 3806 } \
3807 3807 } \
3808 3808 }
3809 3809
3810 3810 #ifdef VM_STATS
3811 3811
3812 3812 #define SEGVN_VMSTAT_FLTVNPAGES(idx) \
3813 3813 VM_STAT_ADD(segvnvmstats.fltvnpages[(idx)]);
3814 3814
3815 3815 #else /* VM_STATS */
3816 3816
3817 3817 #define SEGVN_VMSTAT_FLTVNPAGES(idx)
3818 3818
3819 3819 #endif
3820 3820
3821 3821 static faultcode_t
3822 3822 segvn_fault_vnodepages(struct hat *hat, struct seg *seg, caddr_t lpgaddr,
3823 3823 caddr_t lpgeaddr, enum fault_type type, enum seg_rw rw, caddr_t addr,
3824 3824 caddr_t eaddr, int brkcow)
3825 3825 {
3826 3826 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
3827 3827 struct anon_map *amp = svd->amp;
3828 3828 uchar_t segtype = svd->type;
3829 3829 uint_t szc = seg->s_szc;
3830 3830 size_t pgsz = page_get_pagesize(szc);
3831 3831 size_t maxpgsz = pgsz;
3832 3832 pgcnt_t pages = btop(pgsz);
3833 3833 pgcnt_t maxpages = pages;
3834 3834 size_t ppasize = (pages + 1) * sizeof (page_t *);
3835 3835 caddr_t a = lpgaddr;
3836 3836 caddr_t maxlpgeaddr = lpgeaddr;
3837 3837 u_offset_t off = svd->offset + (uintptr_t)(a - seg->s_base);
3838 3838 ulong_t aindx = svd->anon_index + seg_page(seg, a);
3839 3839 struct vpage *vpage = (svd->vpage != NULL) ?
3840 3840 &svd->vpage[seg_page(seg, a)] : NULL;
3841 3841 vnode_t *vp = svd->vp;
3842 3842 page_t **ppa;
3843 3843 uint_t pszc;
3844 3844 size_t ppgsz;
3845 3845 pgcnt_t ppages;
3846 3846 faultcode_t err = 0;
3847 3847 int ierr;
3848 3848 int vop_size_err = 0;
3849 3849 uint_t protchk, prot, vpprot;
3850 3850 ulong_t i;
3851 3851 int hat_flag = (type == F_SOFTLOCK) ? HAT_LOAD_LOCK : HAT_LOAD;
3852 3852 anon_sync_obj_t an_cookie;
3853 3853 enum seg_rw arw;
3854 3854 int alloc_failed = 0;
3855 3855 int adjszc_chk;
3856 3856 struct vattr va;
3857 3857 page_t *pplist;
3858 3858 pfn_t pfn;
3859 3859 int physcontig;
3860 3860 int upgrdfail;
3861 3861 int segvn_anypgsz_vnode = 0; /* for now map vnode with 2 page sizes */
3862 3862 int tron = (svd->tr_state == SEGVN_TR_ON);
3863 3863
3864 3864 ASSERT(szc != 0);
3865 3865 ASSERT(vp != NULL);
3866 3866 ASSERT(brkcow == 0 || amp != NULL);
3867 3867 ASSERT(tron == 0 || amp != NULL);
3868 3868 ASSERT(enable_mbit_wa == 0); /* no mbit simulations with large pages */
3869 3869 ASSERT(!(svd->flags & MAP_NORESERVE));
3870 3870 ASSERT(type != F_SOFTUNLOCK);
3871 3871 ASSERT(IS_P2ALIGNED(a, maxpgsz));
3872 3872 ASSERT(amp == NULL || IS_P2ALIGNED(aindx, maxpages));
3873 3873 ASSERT(SEGVN_LOCK_HELD(seg->s_as, &svd->lock));
3874 3874 ASSERT(seg->s_szc < NBBY * sizeof (int));
3875 3875 ASSERT(type != F_SOFTLOCK || lpgeaddr - a == maxpgsz);
3876 3876 ASSERT(svd->tr_state != SEGVN_TR_INIT);
3877 3877
3878 3878 VM_STAT_COND_ADD(type == F_SOFTLOCK, segvnvmstats.fltvnpages[0]);
3879 3879 VM_STAT_COND_ADD(type != F_SOFTLOCK, segvnvmstats.fltvnpages[1]);
3880 3880
3881 3881 if (svd->flags & MAP_TEXT) {
3882 3882 hat_flag |= HAT_LOAD_TEXT;
3883 3883 }
3884 3884
3885 3885 if (svd->pageprot) {
3886 3886 switch (rw) {
3887 3887 case S_READ:
3888 3888 protchk = PROT_READ;
3889 3889 break;
3890 3890 case S_WRITE:
3891 3891 protchk = PROT_WRITE;
3892 3892 break;
3893 3893 case S_EXEC:
3894 3894 protchk = PROT_EXEC;
3895 3895 break;
3896 3896 case S_OTHER:
3897 3897 default:
3898 3898 protchk = PROT_READ | PROT_WRITE | PROT_EXEC;
3899 3899 break;
3900 3900 }
3901 3901 } else {
3902 3902 prot = svd->prot;
3903 3903 /* caller has already done segment level protection check. */
3904 3904 }
3905 3905
3906 3906 if (rw == S_WRITE && segtype == MAP_PRIVATE) {
3907 3907 SEGVN_VMSTAT_FLTVNPAGES(2);
3908 3908 arw = S_READ;
3909 3909 } else {
3910 3910 arw = rw;
3911 3911 }
3912 3912
3913 3913 ppa = kmem_alloc(ppasize, KM_SLEEP);
3914 3914
3915 3915 VM_STAT_COND_ADD(amp != NULL, segvnvmstats.fltvnpages[3]);
3916 3916
3917 3917 for (;;) {
3918 3918 adjszc_chk = 0;
3919 3919 for (; a < lpgeaddr; a += pgsz, off += pgsz, aindx += pages) {
3920 3920 if (adjszc_chk) {
3921 3921 while (szc < seg->s_szc) {
3922 3922 uintptr_t e;
3923 3923 uint_t tszc;
3924 3924 tszc = segvn_anypgsz_vnode ? szc + 1 :
3925 3925 seg->s_szc;
3926 3926 ppgsz = page_get_pagesize(tszc);
3927 3927 if (!IS_P2ALIGNED(a, ppgsz) ||
3928 3928 ((alloc_failed >> tszc) & 0x1)) {
3929 3929 break;
3930 3930 }
3931 3931 SEGVN_VMSTAT_FLTVNPAGES(4);
3932 3932 szc = tszc;
3933 3933 pgsz = ppgsz;
3934 3934 pages = btop(pgsz);
3935 3935 e = P2ROUNDUP((uintptr_t)eaddr, pgsz);
3936 3936 lpgeaddr = (caddr_t)e;
3937 3937 }
3938 3938 }
3939 3939
3940 3940 again:
3941 3941 if (IS_P2ALIGNED(a, maxpgsz) && amp != NULL) {
3942 3942 ASSERT(IS_P2ALIGNED(aindx, maxpages));
3943 3943 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
3944 3944 anon_array_enter(amp, aindx, &an_cookie);
3945 3945 if (anon_get_ptr(amp->ahp, aindx) != NULL) {
3946 3946 SEGVN_VMSTAT_FLTVNPAGES(5);
3947 3947 ASSERT(anon_pages(amp->ahp, aindx,
3948 3948 maxpages) == maxpages);
3949 3949 anon_array_exit(&an_cookie);
3950 3950 ANON_LOCK_EXIT(&->a_rwlock);
3951 3951 err = segvn_fault_anonpages(hat, seg,
3952 3952 a, a + maxpgsz, type, rw,
3953 3953 MAX(a, addr),
3954 3954 MIN(a + maxpgsz, eaddr), brkcow);
3955 3955 if (err != 0) {
3956 3956 SEGVN_VMSTAT_FLTVNPAGES(6);
3957 3957 goto out;
3958 3958 }
3959 3959 if (szc < seg->s_szc) {
3960 3960 szc = seg->s_szc;
3961 3961 pgsz = maxpgsz;
3962 3962 pages = maxpages;
3963 3963 lpgeaddr = maxlpgeaddr;
3964 3964 }
3965 3965 goto next;
3966 3966 } else {
3967 3967 ASSERT(anon_pages(amp->ahp, aindx,
3968 3968 maxpages) == 0);
3969 3969 SEGVN_VMSTAT_FLTVNPAGES(7);
3970 3970 anon_array_exit(&an_cookie);
3971 3971 ANON_LOCK_EXIT(&->a_rwlock);
3972 3972 }
3973 3973 }
3974 3974 ASSERT(!brkcow || IS_P2ALIGNED(a, maxpgsz));
3975 3975 ASSERT(!tron || IS_P2ALIGNED(a, maxpgsz));
3976 3976
3977 3977 if (svd->pageprot != 0 && IS_P2ALIGNED(a, maxpgsz)) {
3978 3978 ASSERT(vpage != NULL);
3979 3979 prot = VPP_PROT(vpage);
3980 3980 ASSERT(sameprot(seg, a, maxpgsz));
3981 3981 if ((prot & protchk) == 0) {
3982 3982 SEGVN_VMSTAT_FLTVNPAGES(8);
3983 3983 err = FC_PROT;
3984 3984 goto out;
3985 3985 }
3986 3986 }
3987 3987 if (type == F_SOFTLOCK) {
3988 3988 atomic_add_long((ulong_t *)&svd->softlockcnt,
3989 3989 pages);
3990 3990 }
3991 3991
3992 3992 pplist = NULL;
3993 3993 physcontig = 0;
3994 3994 ppa[0] = NULL;
3995 3995 if (!brkcow && !tron && szc &&
3996 3996 !page_exists_physcontig(vp, off, szc,
3997 3997 segtype == MAP_PRIVATE ? ppa : NULL)) {
3998 3998 SEGVN_VMSTAT_FLTVNPAGES(9);
3999 3999 if (page_alloc_pages(vp, seg, a, &pplist, NULL,
4000 4000 szc, 0, 0) && type != F_SOFTLOCK) {
4001 4001 SEGVN_VMSTAT_FLTVNPAGES(10);
4002 4002 pszc = 0;
4003 4003 ierr = -1;
4004 4004 alloc_failed |= (1 << szc);
4005 4005 break;
4006 4006 }
4007 4007 if (pplist != NULL &&
4008 4008 vp->v_mpssdata == SEGVN_PAGEIO) {
4009 4009 int downsize;
4010 4010 SEGVN_VMSTAT_FLTVNPAGES(11);
4011 4011 physcontig = segvn_fill_vp_pages(svd,
4012 4012 vp, off, szc, ppa, &pplist,
4013 4013 &pszc, &downsize);
4014 4014 ASSERT(!physcontig || pplist == NULL);
4015 4015 if (!physcontig && downsize &&
4016 4016 type != F_SOFTLOCK) {
4017 4017 ASSERT(pplist == NULL);
4018 4018 SEGVN_VMSTAT_FLTVNPAGES(12);
4019 4019 ierr = -1;
4020 4020 break;
4021 4021 }
4022 4022 ASSERT(!physcontig ||
4023 4023 segtype == MAP_PRIVATE ||
4024 4024 ppa[0] == NULL);
4025 4025 if (physcontig && ppa[0] == NULL) {
4026 4026 physcontig = 0;
4027 4027 }
4028 4028 }
4029 4029 } else if (!brkcow && !tron && szc && ppa[0] != NULL) {
4030 4030 SEGVN_VMSTAT_FLTVNPAGES(13);
4031 4031 ASSERT(segtype == MAP_PRIVATE);
4032 4032 physcontig = 1;
4033 4033 }
4034 4034
4035 4035 if (!physcontig) {
4036 4036 SEGVN_VMSTAT_FLTVNPAGES(14);
4037 4037 ppa[0] = NULL;
4038 4038 ierr = VOP_GETPAGE(vp, (offset_t)off, pgsz,
4039 4039 &vpprot, ppa, pgsz, seg, a, arw,
4040 4040 svd->cred, NULL);
4041 4041 #ifdef DEBUG
4042 4042 if (ierr == 0) {
4043 4043 for (i = 0; i < pages; i++) {
4044 4044 ASSERT(PAGE_LOCKED(ppa[i]));
4045 4045 ASSERT(!PP_ISFREE(ppa[i]));
4046 4046 ASSERT(ppa[i]->p_vnode == vp);
4047 4047 ASSERT(ppa[i]->p_offset ==
4048 4048 off + (i << PAGESHIFT));
4049 4049 }
4050 4050 }
4051 4051 #endif /* DEBUG */
4052 4052 if (segtype == MAP_PRIVATE) {
4053 4053 SEGVN_VMSTAT_FLTVNPAGES(15);
4054 4054 vpprot &= ~PROT_WRITE;
4055 4055 }
4056 4056 } else {
4057 4057 ASSERT(segtype == MAP_PRIVATE);
4058 4058 SEGVN_VMSTAT_FLTVNPAGES(16);
4059 4059 vpprot = PROT_ALL & ~PROT_WRITE;
4060 4060 ierr = 0;
4061 4061 }
4062 4062
4063 4063 if (ierr != 0) {
4064 4064 SEGVN_VMSTAT_FLTVNPAGES(17);
4065 4065 if (pplist != NULL) {
4066 4066 SEGVN_VMSTAT_FLTVNPAGES(18);
4067 4067 page_free_replacement_page(pplist);
4068 4068 page_create_putback(pages);
4069 4069 }
4070 4070 SEGVN_RESTORE_SOFTLOCK_VP(type, pages);
4071 4071 if (a + pgsz <= eaddr) {
4072 4072 SEGVN_VMSTAT_FLTVNPAGES(19);
4073 4073 err = FC_MAKE_ERR(ierr);
4074 4074 goto out;
4075 4075 }
4076 4076 va.va_mask = AT_SIZE;
4077 4077 if (VOP_GETATTR(vp, &va, 0, svd->cred, NULL)) {
4078 4078 SEGVN_VMSTAT_FLTVNPAGES(20);
4079 4079 err = FC_MAKE_ERR(EIO);
4080 4080 goto out;
4081 4081 }
4082 4082 if (btopr(va.va_size) >= btopr(off + pgsz)) {
4083 4083 SEGVN_VMSTAT_FLTVNPAGES(21);
4084 4084 err = FC_MAKE_ERR(ierr);
4085 4085 goto out;
4086 4086 }
4087 4087 if (btopr(va.va_size) <
4088 4088 btopr(off + (eaddr - a))) {
4089 4089 SEGVN_VMSTAT_FLTVNPAGES(22);
4090 4090 err = FC_MAKE_ERR(ierr);
4091 4091 goto out;
4092 4092 }
4093 4093 if (brkcow || tron || type == F_SOFTLOCK) {
4094 4094 /* can't reduce map area */
4095 4095 SEGVN_VMSTAT_FLTVNPAGES(23);
4096 4096 vop_size_err = 1;
4097 4097 goto out;
4098 4098 }
4099 4099 SEGVN_VMSTAT_FLTVNPAGES(24);
4100 4100 ASSERT(szc != 0);
4101 4101 pszc = 0;
4102 4102 ierr = -1;
4103 4103 break;
4104 4104 }
4105 4105
4106 4106 if (amp != NULL) {
4107 4107 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
4108 4108 anon_array_enter(amp, aindx, &an_cookie);
4109 4109 }
4110 4110 if (amp != NULL &&
4111 4111 anon_get_ptr(amp->ahp, aindx) != NULL) {
4112 4112 ulong_t taindx = P2ALIGN(aindx, maxpages);
4113 4113
4114 4114 SEGVN_VMSTAT_FLTVNPAGES(25);
4115 4115 ASSERT(anon_pages(amp->ahp, taindx,
4116 4116 maxpages) == maxpages);
4117 4117 for (i = 0; i < pages; i++) {
4118 4118 page_unlock(ppa[i]);
4119 4119 }
4120 4120 anon_array_exit(&an_cookie);
4121 4121 ANON_LOCK_EXIT(&->a_rwlock);
4122 4122 if (pplist != NULL) {
4123 4123 page_free_replacement_page(pplist);
4124 4124 page_create_putback(pages);
4125 4125 }
4126 4126 SEGVN_RESTORE_SOFTLOCK_VP(type, pages);
4127 4127 if (szc < seg->s_szc) {
4128 4128 SEGVN_VMSTAT_FLTVNPAGES(26);
4129 4129 /*
4130 4130 * For private segments SOFTLOCK
4131 4131 * either always breaks cow (any rw
4132 4132 * type except S_READ_NOCOW) or
4133 4133 * address space is locked as writer
4134 4134 * (S_READ_NOCOW case) and anon slots
4135 4135 * can't show up on second check.
4136 4136 * Therefore if we are here for
4137 4137 * SOFTLOCK case it must be a cow
4138 4138 * break but cow break never reduces
4139 4139 * szc. text replication (tron) in
4140 4140 * this case works as cow break.
4141 4141 * Thus the assert below.
4142 4142 */
4143 4143 ASSERT(!brkcow && !tron &&
4144 4144 type != F_SOFTLOCK);
4145 4145 pszc = seg->s_szc;
4146 4146 ierr = -2;
4147 4147 break;
4148 4148 }
4149 4149 ASSERT(IS_P2ALIGNED(a, maxpgsz));
4150 4150 goto again;
4151 4151 }
4152 4152 #ifdef DEBUG
4153 4153 if (amp != NULL) {
4154 4154 ulong_t taindx = P2ALIGN(aindx, maxpages);
4155 4155 ASSERT(!anon_pages(amp->ahp, taindx, maxpages));
4156 4156 }
4157 4157 #endif /* DEBUG */
4158 4158
4159 4159 if (brkcow || tron) {
4160 4160 ASSERT(amp != NULL);
4161 4161 ASSERT(pplist == NULL);
4162 4162 ASSERT(szc == seg->s_szc);
4163 4163 ASSERT(IS_P2ALIGNED(a, maxpgsz));
4164 4164 ASSERT(IS_P2ALIGNED(aindx, maxpages));
4165 4165 SEGVN_VMSTAT_FLTVNPAGES(27);
4166 4166 ierr = anon_map_privatepages(amp, aindx, szc,
4167 4167 seg, a, prot, ppa, vpage, segvn_anypgsz,
4168 4168 tron ? PG_LOCAL : 0, svd->cred);
4169 4169 if (ierr != 0) {
4170 4170 SEGVN_VMSTAT_FLTVNPAGES(28);
4171 4171 anon_array_exit(&an_cookie);
4172 4172 ANON_LOCK_EXIT(&->a_rwlock);
4173 4173 SEGVN_RESTORE_SOFTLOCK_VP(type, pages);
4174 4174 err = FC_MAKE_ERR(ierr);
4175 4175 goto out;
4176 4176 }
4177 4177
4178 4178 ASSERT(!IS_VMODSORT(ppa[0]->p_vnode));
4179 4179 /*
4180 4180 * p_szc can't be changed for locked
4181 4181 * swapfs pages.
4182 4182 */
4183 4183 ASSERT(svd->rcookie ==
4184 4184 HAT_INVALID_REGION_COOKIE);
4185 4185 hat_memload_array(hat, a, pgsz, ppa, prot,
4186 4186 hat_flag);
4187 4187
4188 4188 if (!(hat_flag & HAT_LOAD_LOCK)) {
4189 4189 SEGVN_VMSTAT_FLTVNPAGES(29);
4190 4190 for (i = 0; i < pages; i++) {
4191 4191 page_unlock(ppa[i]);
4192 4192 }
4193 4193 }
4194 4194 anon_array_exit(&an_cookie);
4195 4195 ANON_LOCK_EXIT(&->a_rwlock);
4196 4196 goto next;
4197 4197 }
4198 4198
4199 4199 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE ||
4200 4200 (!svd->pageprot && svd->prot == (prot & vpprot)));
4201 4201
4202 4202 pfn = page_pptonum(ppa[0]);
4203 4203 /*
4204 4204 * hat_page_demote() needs an SE_EXCL lock on one of
4205 4205 * constituent page_t's and it decreases root's p_szc
4206 4206 * last. This means if root's p_szc is equal szc and
4207 4207 * all its constituent pages are locked
4208 4208 * hat_page_demote() that could have changed p_szc to
4209 4209 * szc is already done and no new have page_demote()
4210 4210 * can start for this large page.
4211 4211 */
4212 4212
4213 4213 /*
4214 4214 * we need to make sure same mapping size is used for
4215 4215 * the same address range if there's a possibility the
4216 4216 * adddress is already mapped because hat layer panics
4217 4217 * when translation is loaded for the range already
4218 4218 * mapped with a different page size. We achieve it
4219 4219 * by always using largest page size possible subject
4220 4220 * to the constraints of page size, segment page size
4221 4221 * and page alignment. Since mappings are invalidated
4222 4222 * when those constraints change and make it
4223 4223 * impossible to use previously used mapping size no
4224 4224 * mapping size conflicts should happen.
4225 4225 */
4226 4226
4227 4227 chkszc:
4228 4228 if ((pszc = ppa[0]->p_szc) == szc &&
4229 4229 IS_P2ALIGNED(pfn, pages)) {
4230 4230
4231 4231 SEGVN_VMSTAT_FLTVNPAGES(30);
4232 4232 #ifdef DEBUG
4233 4233 for (i = 0; i < pages; i++) {
4234 4234 ASSERT(PAGE_LOCKED(ppa[i]));
4235 4235 ASSERT(!PP_ISFREE(ppa[i]));
4236 4236 ASSERT(page_pptonum(ppa[i]) ==
4237 4237 pfn + i);
4238 4238 ASSERT(ppa[i]->p_szc == szc);
4239 4239 ASSERT(ppa[i]->p_vnode == vp);
4240 4240 ASSERT(ppa[i]->p_offset ==
4241 4241 off + (i << PAGESHIFT));
4242 4242 }
4243 4243 #endif /* DEBUG */
4244 4244 /*
4245 4245 * All pages are of szc we need and they are
4246 4246 * all locked so they can't change szc. load
4247 4247 * translations.
4248 4248 *
4249 4249 * if page got promoted since last check
4250 4250 * we don't need pplist.
4251 4251 */
4252 4252 if (pplist != NULL) {
4253 4253 page_free_replacement_page(pplist);
4254 4254 page_create_putback(pages);
4255 4255 }
4256 4256 if (PP_ISMIGRATE(ppa[0])) {
4257 4257 page_migrate(seg, a, ppa, pages);
4258 4258 }
4259 4259 SEGVN_UPDATE_MODBITS(ppa, pages, rw,
4260 4260 prot, vpprot);
4261 4261 hat_memload_array_region(hat, a, pgsz,
4262 4262 ppa, prot & vpprot, hat_flag,
4263 4263 svd->rcookie);
4264 4264
4265 4265 if (!(hat_flag & HAT_LOAD_LOCK)) {
4266 4266 for (i = 0; i < pages; i++) {
4267 4267 page_unlock(ppa[i]);
4268 4268 }
4269 4269 }
4270 4270 if (amp != NULL) {
4271 4271 anon_array_exit(&an_cookie);
4272 4272 ANON_LOCK_EXIT(&->a_rwlock);
4273 4273 }
4274 4274 goto next;
4275 4275 }
4276 4276
4277 4277 /*
4278 4278 * See if upsize is possible.
4279 4279 */
4280 4280 if (pszc > szc && szc < seg->s_szc &&
4281 4281 (segvn_anypgsz_vnode || pszc >= seg->s_szc)) {
4282 4282 pgcnt_t aphase;
4283 4283 uint_t pszc1 = MIN(pszc, seg->s_szc);
4284 4284 ppgsz = page_get_pagesize(pszc1);
4285 4285 ppages = btop(ppgsz);
4286 4286 aphase = btop(P2PHASE((uintptr_t)a, ppgsz));
4287 4287
4288 4288 ASSERT(type != F_SOFTLOCK);
4289 4289
4290 4290 SEGVN_VMSTAT_FLTVNPAGES(31);
4291 4291 if (aphase != P2PHASE(pfn, ppages)) {
4292 4292 segvn_faultvnmpss_align_err4++;
4293 4293 } else {
4294 4294 SEGVN_VMSTAT_FLTVNPAGES(32);
4295 4295 if (pplist != NULL) {
4296 4296 page_t *pl = pplist;
4297 4297 page_free_replacement_page(pl);
4298 4298 page_create_putback(pages);
4299 4299 }
4300 4300 for (i = 0; i < pages; i++) {
4301 4301 page_unlock(ppa[i]);
4302 4302 }
4303 4303 if (amp != NULL) {
4304 4304 anon_array_exit(&an_cookie);
4305 4305 ANON_LOCK_EXIT(&->a_rwlock);
4306 4306 }
4307 4307 pszc = pszc1;
4308 4308 ierr = -2;
4309 4309 break;
4310 4310 }
4311 4311 }
4312 4312
4313 4313 /*
4314 4314 * check if we should use smallest mapping size.
4315 4315 */
4316 4316 upgrdfail = 0;
4317 4317 if (szc == 0 ||
4318 4318 (pszc >= szc &&
4319 4319 !IS_P2ALIGNED(pfn, pages)) ||
4320 4320 (pszc < szc &&
4321 4321 !segvn_full_szcpages(ppa, szc, &upgrdfail,
4322 4322 &pszc))) {
4323 4323
4324 4324 if (upgrdfail && type != F_SOFTLOCK) {
4325 4325 /*
4326 4326 * segvn_full_szcpages failed to lock
4327 4327 * all pages EXCL. Size down.
4328 4328 */
4329 4329 ASSERT(pszc < szc);
4330 4330
4331 4331 SEGVN_VMSTAT_FLTVNPAGES(33);
4332 4332
4333 4333 if (pplist != NULL) {
4334 4334 page_t *pl = pplist;
4335 4335 page_free_replacement_page(pl);
4336 4336 page_create_putback(pages);
4337 4337 }
4338 4338
4339 4339 for (i = 0; i < pages; i++) {
4340 4340 page_unlock(ppa[i]);
4341 4341 }
4342 4342 if (amp != NULL) {
4343 4343 anon_array_exit(&an_cookie);
4344 4344 ANON_LOCK_EXIT(&->a_rwlock);
4345 4345 }
4346 4346 ierr = -1;
4347 4347 break;
4348 4348 }
4349 4349 if (szc != 0 && !upgrdfail) {
4350 4350 segvn_faultvnmpss_align_err5++;
4351 4351 }
4352 4352 SEGVN_VMSTAT_FLTVNPAGES(34);
4353 4353 if (pplist != NULL) {
4354 4354 page_free_replacement_page(pplist);
4355 4355 page_create_putback(pages);
4356 4356 }
4357 4357 SEGVN_UPDATE_MODBITS(ppa, pages, rw,
4358 4358 prot, vpprot);
4359 4359 if (upgrdfail && segvn_anypgsz_vnode) {
4360 4360 /* SOFTLOCK case */
4361 4361 hat_memload_array_region(hat, a, pgsz,
4362 4362 ppa, prot & vpprot, hat_flag,
4363 4363 svd->rcookie);
4364 4364 } else {
4365 4365 for (i = 0; i < pages; i++) {
4366 4366 hat_memload_region(hat,
4367 4367 a + (i << PAGESHIFT),
4368 4368 ppa[i], prot & vpprot,
4369 4369 hat_flag, svd->rcookie);
4370 4370 }
4371 4371 }
4372 4372 if (!(hat_flag & HAT_LOAD_LOCK)) {
4373 4373 for (i = 0; i < pages; i++) {
4374 4374 page_unlock(ppa[i]);
4375 4375 }
4376 4376 }
4377 4377 if (amp != NULL) {
4378 4378 anon_array_exit(&an_cookie);
4379 4379 ANON_LOCK_EXIT(&->a_rwlock);
4380 4380 }
4381 4381 goto next;
4382 4382 }
4383 4383
4384 4384 if (pszc == szc) {
4385 4385 /*
4386 4386 * segvn_full_szcpages() upgraded pages szc.
4387 4387 */
4388 4388 ASSERT(pszc == ppa[0]->p_szc);
4389 4389 ASSERT(IS_P2ALIGNED(pfn, pages));
4390 4390 goto chkszc;
4391 4391 }
4392 4392
4393 4393 if (pszc > szc) {
4394 4394 kmutex_t *szcmtx;
4395 4395 SEGVN_VMSTAT_FLTVNPAGES(35);
4396 4396 /*
4397 4397 * p_szc of ppa[0] can change since we haven't
4398 4398 * locked all constituent pages. Call
4399 4399 * page_lock_szc() to prevent szc changes.
4400 4400 * This should be a rare case that happens when
4401 4401 * multiple segments use a different page size
4402 4402 * to map the same file offsets.
4403 4403 */
4404 4404 szcmtx = page_szc_lock(ppa[0]);
4405 4405 pszc = ppa[0]->p_szc;
4406 4406 ASSERT(szcmtx != NULL || pszc == 0);
4407 4407 ASSERT(ppa[0]->p_szc <= pszc);
4408 4408 if (pszc <= szc) {
4409 4409 SEGVN_VMSTAT_FLTVNPAGES(36);
4410 4410 if (szcmtx != NULL) {
4411 4411 mutex_exit(szcmtx);
4412 4412 }
4413 4413 goto chkszc;
4414 4414 }
4415 4415 if (pplist != NULL) {
4416 4416 /*
4417 4417 * page got promoted since last check.
4418 4418 * we don't need preaalocated large
4419 4419 * page.
4420 4420 */
4421 4421 SEGVN_VMSTAT_FLTVNPAGES(37);
4422 4422 page_free_replacement_page(pplist);
4423 4423 page_create_putback(pages);
4424 4424 }
4425 4425 SEGVN_UPDATE_MODBITS(ppa, pages, rw,
4426 4426 prot, vpprot);
4427 4427 hat_memload_array_region(hat, a, pgsz, ppa,
4428 4428 prot & vpprot, hat_flag, svd->rcookie);
4429 4429 mutex_exit(szcmtx);
4430 4430 if (!(hat_flag & HAT_LOAD_LOCK)) {
4431 4431 for (i = 0; i < pages; i++) {
4432 4432 page_unlock(ppa[i]);
4433 4433 }
4434 4434 }
4435 4435 if (amp != NULL) {
4436 4436 anon_array_exit(&an_cookie);
4437 4437 ANON_LOCK_EXIT(&->a_rwlock);
4438 4438 }
4439 4439 goto next;
4440 4440 }
4441 4441
4442 4442 /*
4443 4443 * if page got demoted since last check
4444 4444 * we could have not allocated larger page.
4445 4445 * allocate now.
4446 4446 */
4447 4447 if (pplist == NULL &&
4448 4448 page_alloc_pages(vp, seg, a, &pplist, NULL,
4449 4449 szc, 0, 0) && type != F_SOFTLOCK) {
4450 4450 SEGVN_VMSTAT_FLTVNPAGES(38);
4451 4451 for (i = 0; i < pages; i++) {
4452 4452 page_unlock(ppa[i]);
4453 4453 }
4454 4454 if (amp != NULL) {
4455 4455 anon_array_exit(&an_cookie);
4456 4456 ANON_LOCK_EXIT(&->a_rwlock);
4457 4457 }
4458 4458 ierr = -1;
4459 4459 alloc_failed |= (1 << szc);
4460 4460 break;
4461 4461 }
4462 4462
4463 4463 SEGVN_VMSTAT_FLTVNPAGES(39);
4464 4464
4465 4465 if (pplist != NULL) {
4466 4466 segvn_relocate_pages(ppa, pplist);
4467 4467 #ifdef DEBUG
4468 4468 } else {
4469 4469 ASSERT(type == F_SOFTLOCK);
4470 4470 SEGVN_VMSTAT_FLTVNPAGES(40);
4471 4471 #endif /* DEBUG */
4472 4472 }
4473 4473
4474 4474 SEGVN_UPDATE_MODBITS(ppa, pages, rw, prot, vpprot);
4475 4475
4476 4476 if (pplist == NULL && segvn_anypgsz_vnode == 0) {
4477 4477 ASSERT(type == F_SOFTLOCK);
4478 4478 for (i = 0; i < pages; i++) {
4479 4479 ASSERT(ppa[i]->p_szc < szc);
4480 4480 hat_memload_region(hat,
4481 4481 a + (i << PAGESHIFT),
4482 4482 ppa[i], prot & vpprot, hat_flag,
4483 4483 svd->rcookie);
4484 4484 }
4485 4485 } else {
4486 4486 ASSERT(pplist != NULL || type == F_SOFTLOCK);
4487 4487 hat_memload_array_region(hat, a, pgsz, ppa,
4488 4488 prot & vpprot, hat_flag, svd->rcookie);
4489 4489 }
4490 4490 if (!(hat_flag & HAT_LOAD_LOCK)) {
4491 4491 for (i = 0; i < pages; i++) {
4492 4492 ASSERT(PAGE_SHARED(ppa[i]));
4493 4493 page_unlock(ppa[i]);
4494 4494 }
4495 4495 }
4496 4496 if (amp != NULL) {
4497 4497 anon_array_exit(&an_cookie);
4498 4498 ANON_LOCK_EXIT(&->a_rwlock);
4499 4499 }
4500 4500
4501 4501 next:
4502 4502 if (vpage != NULL) {
4503 4503 vpage += pages;
4504 4504 }
4505 4505 adjszc_chk = 1;
4506 4506 }
4507 4507 if (a == lpgeaddr)
4508 4508 break;
4509 4509 ASSERT(a < lpgeaddr);
4510 4510
4511 4511 ASSERT(!brkcow && !tron && type != F_SOFTLOCK);
4512 4512
4513 4513 /*
4514 4514 * ierr == -1 means we failed to map with a large page.
4515 4515 * (either due to allocation/relocation failures or
4516 4516 * misalignment with other mappings to this file.
4517 4517 *
4518 4518 * ierr == -2 means some other thread allocated a large page
4519 4519 * after we gave up tp map with a large page. retry with
4520 4520 * larger mapping.
4521 4521 */
4522 4522 ASSERT(ierr == -1 || ierr == -2);
4523 4523 ASSERT(ierr == -2 || szc != 0);
4524 4524 ASSERT(ierr == -1 || szc < seg->s_szc);
4525 4525 if (ierr == -2) {
4526 4526 SEGVN_VMSTAT_FLTVNPAGES(41);
4527 4527 ASSERT(pszc > szc && pszc <= seg->s_szc);
4528 4528 szc = pszc;
4529 4529 } else if (segvn_anypgsz_vnode) {
4530 4530 SEGVN_VMSTAT_FLTVNPAGES(42);
4531 4531 szc--;
4532 4532 } else {
4533 4533 SEGVN_VMSTAT_FLTVNPAGES(43);
4534 4534 ASSERT(pszc < szc);
4535 4535 /*
4536 4536 * other process created pszc large page.
4537 4537 * but we still have to drop to 0 szc.
4538 4538 */
4539 4539 szc = 0;
4540 4540 }
4541 4541
4542 4542 pgsz = page_get_pagesize(szc);
4543 4543 pages = btop(pgsz);
4544 4544 if (ierr == -2) {
4545 4545 /*
4546 4546 * Size up case. Note lpgaddr may only be needed for
4547 4547 * softlock case so we don't adjust it here.
4548 4548 */
4549 4549 a = (caddr_t)P2ALIGN((uintptr_t)a, pgsz);
4550 4550 ASSERT(a >= lpgaddr);
4551 4551 lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)eaddr, pgsz);
4552 4552 off = svd->offset + (uintptr_t)(a - seg->s_base);
4553 4553 aindx = svd->anon_index + seg_page(seg, a);
4554 4554 vpage = (svd->vpage != NULL) ?
4555 4555 &svd->vpage[seg_page(seg, a)] : NULL;
4556 4556 } else {
4557 4557 /*
4558 4558 * Size down case. Note lpgaddr may only be needed for
4559 4559 * softlock case so we don't adjust it here.
4560 4560 */
4561 4561 ASSERT(IS_P2ALIGNED(a, pgsz));
4562 4562 ASSERT(IS_P2ALIGNED(lpgeaddr, pgsz));
4563 4563 lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)eaddr, pgsz);
4564 4564 ASSERT(a < lpgeaddr);
4565 4565 if (a < addr) {
4566 4566 SEGVN_VMSTAT_FLTVNPAGES(44);
4567 4567 /*
4568 4568 * The beginning of the large page region can
4569 4569 * be pulled to the right to make a smaller
4570 4570 * region. We haven't yet faulted a single
4571 4571 * page.
4572 4572 */
4573 4573 a = (caddr_t)P2ALIGN((uintptr_t)addr, pgsz);
4574 4574 ASSERT(a >= lpgaddr);
4575 4575 off = svd->offset +
4576 4576 (uintptr_t)(a - seg->s_base);
4577 4577 aindx = svd->anon_index + seg_page(seg, a);
4578 4578 vpage = (svd->vpage != NULL) ?
4579 4579 &svd->vpage[seg_page(seg, a)] : NULL;
4580 4580 }
4581 4581 }
4582 4582 }
4583 4583 out:
4584 4584 kmem_free(ppa, ppasize);
4585 4585 if (!err && !vop_size_err) {
4586 4586 SEGVN_VMSTAT_FLTVNPAGES(45);
4587 4587 return (0);
4588 4588 }
4589 4589 if (type == F_SOFTLOCK && a > lpgaddr) {
4590 4590 SEGVN_VMSTAT_FLTVNPAGES(46);
4591 4591 segvn_softunlock(seg, lpgaddr, a - lpgaddr, S_OTHER);
4592 4592 }
4593 4593 if (!vop_size_err) {
4594 4594 SEGVN_VMSTAT_FLTVNPAGES(47);
4595 4595 return (err);
4596 4596 }
4597 4597 ASSERT(brkcow || tron || type == F_SOFTLOCK);
4598 4598 /*
4599 4599 * Large page end is mapped beyond the end of file and it's a cow
4600 4600 * fault (can be a text replication induced cow) or softlock so we can't
4601 4601 * reduce the map area. For now just demote the segment. This should
4602 4602 * really only happen if the end of the file changed after the mapping
4603 4603 * was established since when large page segments are created we make
4604 4604 * sure they don't extend beyond the end of the file.
4605 4605 */
4606 4606 SEGVN_VMSTAT_FLTVNPAGES(48);
4607 4607
4608 4608 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
4609 4609 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
4610 4610 err = 0;
4611 4611 if (seg->s_szc != 0) {
4612 4612 segvn_fltvnpages_clrszc_cnt++;
4613 4613 ASSERT(svd->softlockcnt == 0);
4614 4614 err = segvn_clrszc(seg);
4615 4615 if (err != 0) {
4616 4616 segvn_fltvnpages_clrszc_err++;
4617 4617 }
4618 4618 }
4619 4619 ASSERT(err || seg->s_szc == 0);
4620 4620 SEGVN_LOCK_DOWNGRADE(seg->s_as, &svd->lock);
4621 4621 /* segvn_fault will do its job as if szc had been zero to begin with */
4622 4622 return (err == 0 ? IE_RETRY : FC_MAKE_ERR(err));
4623 4623 }
4624 4624
4625 4625 /*
4626 4626 * This routine will attempt to fault in one large page.
4627 4627 * it will use smaller pages if that fails.
4628 4628 * It should only be called for pure anonymous segments.
4629 4629 */
4630 4630 static faultcode_t
4631 4631 segvn_fault_anonpages(struct hat *hat, struct seg *seg, caddr_t lpgaddr,
4632 4632 caddr_t lpgeaddr, enum fault_type type, enum seg_rw rw, caddr_t addr,
4633 4633 caddr_t eaddr, int brkcow)
4634 4634 {
4635 4635 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
4636 4636 struct anon_map *amp = svd->amp;
4637 4637 uchar_t segtype = svd->type;
4638 4638 uint_t szc = seg->s_szc;
4639 4639 size_t pgsz = page_get_pagesize(szc);
4640 4640 size_t maxpgsz = pgsz;
4641 4641 pgcnt_t pages = btop(pgsz);
4642 4642 uint_t ppaszc = szc;
4643 4643 caddr_t a = lpgaddr;
4644 4644 ulong_t aindx = svd->anon_index + seg_page(seg, a);
4645 4645 struct vpage *vpage = (svd->vpage != NULL) ?
4646 4646 &svd->vpage[seg_page(seg, a)] : NULL;
4647 4647 page_t **ppa;
4648 4648 uint_t ppa_szc;
4649 4649 faultcode_t err;
4650 4650 int ierr;
4651 4651 uint_t protchk, prot, vpprot;
4652 4652 ulong_t i;
4653 4653 int hat_flag = (type == F_SOFTLOCK) ? HAT_LOAD_LOCK : HAT_LOAD;
4654 4654 anon_sync_obj_t cookie;
4655 4655 int adjszc_chk;
4656 4656 int pgflags = (svd->tr_state == SEGVN_TR_ON) ? PG_LOCAL : 0;
4657 4657
4658 4658 ASSERT(szc != 0);
4659 4659 ASSERT(amp != NULL);
4660 4660 ASSERT(enable_mbit_wa == 0); /* no mbit simulations with large pages */
4661 4661 ASSERT(!(svd->flags & MAP_NORESERVE));
4662 4662 ASSERT(type != F_SOFTUNLOCK);
4663 4663 ASSERT(IS_P2ALIGNED(a, maxpgsz));
4664 4664 ASSERT(!brkcow || svd->tr_state == SEGVN_TR_OFF);
4665 4665 ASSERT(svd->tr_state != SEGVN_TR_INIT);
4666 4666
4667 4667 ASSERT(SEGVN_LOCK_HELD(seg->s_as, &svd->lock));
4668 4668
4669 4669 VM_STAT_COND_ADD(type == F_SOFTLOCK, segvnvmstats.fltanpages[0]);
4670 4670 VM_STAT_COND_ADD(type != F_SOFTLOCK, segvnvmstats.fltanpages[1]);
4671 4671
4672 4672 if (svd->flags & MAP_TEXT) {
4673 4673 hat_flag |= HAT_LOAD_TEXT;
4674 4674 }
4675 4675
4676 4676 if (svd->pageprot) {
4677 4677 switch (rw) {
4678 4678 case S_READ:
4679 4679 protchk = PROT_READ;
4680 4680 break;
4681 4681 case S_WRITE:
4682 4682 protchk = PROT_WRITE;
4683 4683 break;
4684 4684 case S_EXEC:
4685 4685 protchk = PROT_EXEC;
4686 4686 break;
4687 4687 case S_OTHER:
4688 4688 default:
4689 4689 protchk = PROT_READ | PROT_WRITE | PROT_EXEC;
4690 4690 break;
4691 4691 }
4692 4692 VM_STAT_ADD(segvnvmstats.fltanpages[2]);
4693 4693 } else {
4694 4694 prot = svd->prot;
4695 4695 /* caller has already done segment level protection check. */
4696 4696 }
4697 4697
4698 4698 ppa = kmem_cache_alloc(segvn_szc_cache[ppaszc], KM_SLEEP);
4699 4699 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
4700 4700 for (;;) {
4701 4701 adjszc_chk = 0;
4702 4702 for (; a < lpgeaddr; a += pgsz, aindx += pages) {
4703 4703 if (svd->pageprot != 0 && IS_P2ALIGNED(a, maxpgsz)) {
4704 4704 VM_STAT_ADD(segvnvmstats.fltanpages[3]);
4705 4705 ASSERT(vpage != NULL);
4706 4706 prot = VPP_PROT(vpage);
4707 4707 ASSERT(sameprot(seg, a, maxpgsz));
4708 4708 if ((prot & protchk) == 0) {
4709 4709 err = FC_PROT;
4710 4710 goto error;
4711 4711 }
4712 4712 }
4713 4713 if (adjszc_chk && IS_P2ALIGNED(a, maxpgsz) &&
4714 4714 pgsz < maxpgsz) {
4715 4715 ASSERT(a > lpgaddr);
4716 4716 szc = seg->s_szc;
4717 4717 pgsz = maxpgsz;
4718 4718 pages = btop(pgsz);
4719 4719 ASSERT(IS_P2ALIGNED(aindx, pages));
4720 4720 lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)eaddr,
4721 4721 pgsz);
4722 4722 }
4723 4723 if (type == F_SOFTLOCK) {
4724 4724 atomic_add_long((ulong_t *)&svd->softlockcnt,
4725 4725 pages);
4726 4726 }
4727 4727 anon_array_enter(amp, aindx, &cookie);
4728 4728 ppa_szc = (uint_t)-1;
4729 4729 ierr = anon_map_getpages(amp, aindx, szc, seg, a,
4730 4730 prot, &vpprot, ppa, &ppa_szc, vpage, rw, brkcow,
4731 4731 segvn_anypgsz, pgflags, svd->cred);
4732 4732 if (ierr != 0) {
4733 4733 anon_array_exit(&cookie);
4734 4734 VM_STAT_ADD(segvnvmstats.fltanpages[4]);
4735 4735 if (type == F_SOFTLOCK) {
4736 4736 atomic_add_long(
4737 4737 (ulong_t *)&svd->softlockcnt,
4738 4738 -pages);
4739 4739 }
4740 4740 if (ierr > 0) {
4741 4741 VM_STAT_ADD(segvnvmstats.fltanpages[6]);
4742 4742 err = FC_MAKE_ERR(ierr);
4743 4743 goto error;
4744 4744 }
4745 4745 break;
4746 4746 }
4747 4747
4748 4748 ASSERT(!IS_VMODSORT(ppa[0]->p_vnode));
4749 4749
4750 4750 ASSERT(segtype == MAP_SHARED ||
4751 4751 ppa[0]->p_szc <= szc);
4752 4752 ASSERT(segtype == MAP_PRIVATE ||
4753 4753 ppa[0]->p_szc >= szc);
4754 4754
4755 4755 /*
4756 4756 * Handle pages that have been marked for migration
4757 4757 */
4758 4758 if (lgrp_optimizations())
4759 4759 page_migrate(seg, a, ppa, pages);
4760 4760
4761 4761 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
4762 4762
4763 4763 if (segtype == MAP_SHARED) {
4764 4764 vpprot |= PROT_WRITE;
4765 4765 }
4766 4766
4767 4767 hat_memload_array(hat, a, pgsz, ppa,
4768 4768 prot & vpprot, hat_flag);
4769 4769
4770 4770 if (hat_flag & HAT_LOAD_LOCK) {
4771 4771 VM_STAT_ADD(segvnvmstats.fltanpages[7]);
4772 4772 } else {
4773 4773 VM_STAT_ADD(segvnvmstats.fltanpages[8]);
4774 4774 for (i = 0; i < pages; i++)
4775 4775 page_unlock(ppa[i]);
4776 4776 }
4777 4777 if (vpage != NULL)
4778 4778 vpage += pages;
4779 4779
4780 4780 anon_array_exit(&cookie);
4781 4781 adjszc_chk = 1;
4782 4782 }
4783 4783 if (a == lpgeaddr)
4784 4784 break;
4785 4785 ASSERT(a < lpgeaddr);
4786 4786 /*
4787 4787 * ierr == -1 means we failed to allocate a large page.
4788 4788 * so do a size down operation.
4789 4789 *
4790 4790 * ierr == -2 means some other process that privately shares
4791 4791 * pages with this process has allocated a larger page and we
4792 4792 * need to retry with larger pages. So do a size up
4793 4793 * operation. This relies on the fact that large pages are
4794 4794 * never partially shared i.e. if we share any constituent
4795 4795 * page of a large page with another process we must share the
4796 4796 * entire large page. Note this cannot happen for SOFTLOCK
4797 4797 * case, unless current address (a) is at the beginning of the
4798 4798 * next page size boundary because the other process couldn't
4799 4799 * have relocated locked pages.
4800 4800 */
4801 4801 ASSERT(ierr == -1 || ierr == -2);
4802 4802
4803 4803 if (segvn_anypgsz) {
4804 4804 ASSERT(ierr == -2 || szc != 0);
4805 4805 ASSERT(ierr == -1 || szc < seg->s_szc);
4806 4806 szc = (ierr == -1) ? szc - 1 : szc + 1;
4807 4807 } else {
4808 4808 /*
4809 4809 * For non COW faults and segvn_anypgsz == 0
4810 4810 * we need to be careful not to loop forever
4811 4811 * if existing page is found with szc other
4812 4812 * than 0 or seg->s_szc. This could be due
4813 4813 * to page relocations on behalf of DR or
4814 4814 * more likely large page creation. For this
4815 4815 * case simply re-size to existing page's szc
4816 4816 * if returned by anon_map_getpages().
4817 4817 */
4818 4818 if (ppa_szc == (uint_t)-1) {
4819 4819 szc = (ierr == -1) ? 0 : seg->s_szc;
4820 4820 } else {
4821 4821 ASSERT(ppa_szc <= seg->s_szc);
4822 4822 ASSERT(ierr == -2 || ppa_szc < szc);
4823 4823 ASSERT(ierr == -1 || ppa_szc > szc);
4824 4824 szc = ppa_szc;
4825 4825 }
4826 4826 }
4827 4827
4828 4828 pgsz = page_get_pagesize(szc);
4829 4829 pages = btop(pgsz);
4830 4830 ASSERT(type != F_SOFTLOCK || ierr == -1 ||
4831 4831 (IS_P2ALIGNED(a, pgsz) && IS_P2ALIGNED(lpgeaddr, pgsz)));
4832 4832 if (type == F_SOFTLOCK) {
4833 4833 /*
4834 4834 * For softlocks we cannot reduce the fault area
4835 4835 * (calculated based on the largest page size for this
4836 4836 * segment) for size down and a is already next
4837 4837 * page size aligned as assertted above for size
4838 4838 * ups. Therefore just continue in case of softlock.
4839 4839 */
4840 4840 VM_STAT_ADD(segvnvmstats.fltanpages[9]);
4841 4841 continue; /* keep lint happy */
4842 4842 } else if (ierr == -2) {
4843 4843
4844 4844 /*
4845 4845 * Size up case. Note lpgaddr may only be needed for
4846 4846 * softlock case so we don't adjust it here.
4847 4847 */
4848 4848 VM_STAT_ADD(segvnvmstats.fltanpages[10]);
4849 4849 a = (caddr_t)P2ALIGN((uintptr_t)a, pgsz);
4850 4850 ASSERT(a >= lpgaddr);
4851 4851 lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)eaddr, pgsz);
4852 4852 aindx = svd->anon_index + seg_page(seg, a);
4853 4853 vpage = (svd->vpage != NULL) ?
4854 4854 &svd->vpage[seg_page(seg, a)] : NULL;
4855 4855 } else {
4856 4856 /*
4857 4857 * Size down case. Note lpgaddr may only be needed for
4858 4858 * softlock case so we don't adjust it here.
4859 4859 */
4860 4860 VM_STAT_ADD(segvnvmstats.fltanpages[11]);
4861 4861 ASSERT(IS_P2ALIGNED(a, pgsz));
4862 4862 ASSERT(IS_P2ALIGNED(lpgeaddr, pgsz));
4863 4863 lpgeaddr = (caddr_t)P2ROUNDUP((uintptr_t)eaddr, pgsz);
4864 4864 ASSERT(a < lpgeaddr);
4865 4865 if (a < addr) {
4866 4866 /*
4867 4867 * The beginning of the large page region can
4868 4868 * be pulled to the right to make a smaller
4869 4869 * region. We haven't yet faulted a single
4870 4870 * page.
4871 4871 */
4872 4872 VM_STAT_ADD(segvnvmstats.fltanpages[12]);
4873 4873 a = (caddr_t)P2ALIGN((uintptr_t)addr, pgsz);
4874 4874 ASSERT(a >= lpgaddr);
4875 4875 aindx = svd->anon_index + seg_page(seg, a);
4876 4876 vpage = (svd->vpage != NULL) ?
4877 4877 &svd->vpage[seg_page(seg, a)] : NULL;
4878 4878 }
4879 4879 }
4880 4880 }
4881 4881 VM_STAT_ADD(segvnvmstats.fltanpages[13]);
4882 4882 ANON_LOCK_EXIT(&->a_rwlock);
4883 4883 kmem_cache_free(segvn_szc_cache[ppaszc], ppa);
4884 4884 return (0);
4885 4885 error:
4886 4886 VM_STAT_ADD(segvnvmstats.fltanpages[14]);
4887 4887 ANON_LOCK_EXIT(&->a_rwlock);
4888 4888 kmem_cache_free(segvn_szc_cache[ppaszc], ppa);
4889 4889 if (type == F_SOFTLOCK && a > lpgaddr) {
4890 4890 VM_STAT_ADD(segvnvmstats.fltanpages[15]);
4891 4891 segvn_softunlock(seg, lpgaddr, a - lpgaddr, S_OTHER);
4892 4892 }
4893 4893 return (err);
4894 4894 }
4895 4895
4896 4896 int fltadvice = 1; /* set to free behind pages for sequential access */
4897 4897
4898 4898 /*
4899 4899 * This routine is called via a machine specific fault handling routine.
4900 4900 * It is also called by software routines wishing to lock or unlock
4901 4901 * a range of addresses.
4902 4902 *
4903 4903 * Here is the basic algorithm:
4904 4904 * If unlocking
4905 4905 * Call segvn_softunlock
4906 4906 * Return
4907 4907 * endif
4908 4908 * Checking and set up work
4909 4909 * If we will need some non-anonymous pages
4910 4910 * Call VOP_GETPAGE over the range of non-anonymous pages
4911 4911 * endif
4912 4912 * Loop over all addresses requested
4913 4913 * Call segvn_faultpage passing in page list
4914 4914 * to load up translations and handle anonymous pages
4915 4915 * endloop
4916 4916 * Load up translation to any additional pages in page list not
4917 4917 * already handled that fit into this segment
4918 4918 */
4919 4919 static faultcode_t
4920 4920 segvn_fault(struct hat *hat, struct seg *seg, caddr_t addr, size_t len,
4921 4921 enum fault_type type, enum seg_rw rw)
4922 4922 {
4923 4923 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
4924 4924 page_t **plp, **ppp, *pp;
4925 4925 u_offset_t off;
4926 4926 caddr_t a;
4927 4927 struct vpage *vpage;
4928 4928 uint_t vpprot, prot;
4929 4929 int err;
4930 4930 page_t *pl[PVN_GETPAGE_NUM + 1];
4931 4931 size_t plsz, pl_alloc_sz;
4932 4932 size_t page;
4933 4933 ulong_t anon_index;
4934 4934 struct anon_map *amp;
4935 4935 int dogetpage = 0;
4936 4936 caddr_t lpgaddr, lpgeaddr;
4937 4937 size_t pgsz;
4938 4938 anon_sync_obj_t cookie;
4939 4939 int brkcow = BREAK_COW_SHARE(rw, type, svd->type);
4940 4940
4941 4941 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
4942 4942 ASSERT(svd->amp == NULL || svd->rcookie == HAT_INVALID_REGION_COOKIE);
4943 4943
4944 4944 /*
4945 4945 * First handle the easy stuff
4946 4946 */
4947 4947 if (type == F_SOFTUNLOCK) {
4948 4948 if (rw == S_READ_NOCOW) {
4949 4949 rw = S_READ;
4950 4950 ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
4951 4951 }
4952 4952 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
4953 4953 pgsz = (seg->s_szc == 0) ? PAGESIZE :
4954 4954 page_get_pagesize(seg->s_szc);
4955 4955 VM_STAT_COND_ADD(pgsz > PAGESIZE, segvnvmstats.fltanpages[16]);
4956 4956 CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr);
4957 4957 segvn_softunlock(seg, lpgaddr, lpgeaddr - lpgaddr, rw);
4958 4958 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
4959 4959 return (0);
4960 4960 }
4961 4961
4962 4962 ASSERT(svd->tr_state == SEGVN_TR_OFF ||
4963 4963 !HAT_IS_REGION_COOKIE_VALID(svd->rcookie));
4964 4964 if (brkcow == 0) {
4965 4965 if (svd->tr_state == SEGVN_TR_INIT) {
4966 4966 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
4967 4967 if (svd->tr_state == SEGVN_TR_INIT) {
4968 4968 ASSERT(svd->vp != NULL && svd->amp == NULL);
4969 4969 ASSERT(svd->flags & MAP_TEXT);
4970 4970 ASSERT(svd->type == MAP_PRIVATE);
4971 4971 segvn_textrepl(seg);
4972 4972 ASSERT(svd->tr_state != SEGVN_TR_INIT);
4973 4973 ASSERT(svd->tr_state != SEGVN_TR_ON ||
4974 4974 svd->amp != NULL);
4975 4975 }
4976 4976 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
4977 4977 }
4978 4978 } else if (svd->tr_state != SEGVN_TR_OFF) {
4979 4979 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
4980 4980
4981 4981 if (rw == S_WRITE && svd->tr_state != SEGVN_TR_OFF) {
4982 4982 ASSERT(!svd->pageprot && !(svd->prot & PROT_WRITE));
4983 4983 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
4984 4984 return (FC_PROT);
4985 4985 }
4986 4986
4987 4987 if (svd->tr_state == SEGVN_TR_ON) {
4988 4988 ASSERT(svd->vp != NULL && svd->amp != NULL);
4989 4989 segvn_textunrepl(seg, 0);
4990 4990 ASSERT(svd->amp == NULL &&
4991 4991 svd->tr_state == SEGVN_TR_OFF);
4992 4992 } else if (svd->tr_state != SEGVN_TR_OFF) {
4993 4993 svd->tr_state = SEGVN_TR_OFF;
4994 4994 }
4995 4995 ASSERT(svd->amp == NULL && svd->tr_state == SEGVN_TR_OFF);
4996 4996 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
4997 4997 }
4998 4998
4999 4999 top:
5000 5000 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
5001 5001
5002 5002 /*
5003 5003 * If we have the same protections for the entire segment,
5004 5004 * insure that the access being attempted is legitimate.
5005 5005 */
5006 5006
5007 5007 if (svd->pageprot == 0) {
5008 5008 uint_t protchk;
5009 5009
5010 5010 switch (rw) {
5011 5011 case S_READ:
5012 5012 case S_READ_NOCOW:
5013 5013 protchk = PROT_READ;
5014 5014 break;
5015 5015 case S_WRITE:
5016 5016 protchk = PROT_WRITE;
5017 5017 break;
5018 5018 case S_EXEC:
5019 5019 protchk = PROT_EXEC;
5020 5020 break;
5021 5021 case S_OTHER:
5022 5022 default:
5023 5023 protchk = PROT_READ | PROT_WRITE | PROT_EXEC;
5024 5024 break;
5025 5025 }
5026 5026
5027 5027 if ((svd->prot & protchk) == 0) {
5028 5028 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5029 5029 return (FC_PROT); /* illegal access type */
5030 5030 }
5031 5031 }
5032 5032
5033 5033 if (brkcow && HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
5034 5034 /* this must be SOFTLOCK S_READ fault */
5035 5035 ASSERT(svd->amp == NULL);
5036 5036 ASSERT(svd->tr_state == SEGVN_TR_OFF);
5037 5037 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5038 5038 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
5039 5039 if (HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
5040 5040 /*
5041 5041 * this must be the first ever non S_READ_NOCOW
5042 5042 * softlock for this segment.
5043 5043 */
5044 5044 ASSERT(svd->softlockcnt == 0);
5045 5045 hat_leave_region(seg->s_as->a_hat, svd->rcookie,
5046 5046 HAT_REGION_TEXT);
5047 5047 svd->rcookie = HAT_INVALID_REGION_COOKIE;
5048 5048 }
5049 5049 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5050 5050 goto top;
5051 5051 }
5052 5052
5053 5053 /*
5054 5054 * We can't allow the long term use of softlocks for vmpss segments,
5055 5055 * because in some file truncation cases we should be able to demote
5056 5056 * the segment, which requires that there are no softlocks. The
5057 5057 * only case where it's ok to allow a SOFTLOCK fault against a vmpss
5058 5058 * segment is S_READ_NOCOW, where the caller holds the address space
5059 5059 * locked as writer and calls softunlock before dropping the as lock.
5060 5060 * S_READ_NOCOW is used by /proc to read memory from another user.
5061 5061 *
5062 5062 * Another deadlock between SOFTLOCK and file truncation can happen
5063 5063 * because segvn_fault_vnodepages() calls the FS one pagesize at
5064 5064 * a time. A second VOP_GETPAGE() call by segvn_fault_vnodepages()
5065 5065 * can cause a deadlock because the first set of page_t's remain
5066 5066 * locked SE_SHARED. To avoid this, we demote segments on a first
5067 5067 * SOFTLOCK if they have a length greater than the segment's
5068 5068 * page size.
5069 5069 *
5070 5070 * So for now, we only avoid demoting a segment on a SOFTLOCK when
5071 5071 * the access type is S_READ_NOCOW and the fault length is less than
5072 5072 * or equal to the segment's page size. While this is quite restrictive,
5073 5073 * it should be the most common case of SOFTLOCK against a vmpss
5074 5074 * segment.
5075 5075 *
5076 5076 * For S_READ_NOCOW, it's safe not to do a copy on write because the
5077 5077 * caller makes sure no COW will be caused by another thread for a
5078 5078 * softlocked page.
5079 5079 */
5080 5080 if (type == F_SOFTLOCK && svd->vp != NULL && seg->s_szc != 0) {
5081 5081 int demote = 0;
5082 5082
5083 5083 if (rw != S_READ_NOCOW) {
5084 5084 demote = 1;
5085 5085 }
5086 5086 if (!demote && len > PAGESIZE) {
5087 5087 pgsz = page_get_pagesize(seg->s_szc);
5088 5088 CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr,
5089 5089 lpgeaddr);
5090 5090 if (lpgeaddr - lpgaddr > pgsz) {
5091 5091 demote = 1;
5092 5092 }
5093 5093 }
5094 5094
5095 5095 ASSERT(demote || AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
5096 5096
5097 5097 if (demote) {
5098 5098 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5099 5099 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
5100 5100 if (seg->s_szc != 0) {
5101 5101 segvn_vmpss_clrszc_cnt++;
5102 5102 ASSERT(svd->softlockcnt == 0);
5103 5103 err = segvn_clrszc(seg);
5104 5104 if (err) {
5105 5105 segvn_vmpss_clrszc_err++;
5106 5106 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5107 5107 return (FC_MAKE_ERR(err));
5108 5108 }
5109 5109 }
5110 5110 ASSERT(seg->s_szc == 0);
5111 5111 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5112 5112 goto top;
5113 5113 }
5114 5114 }
5115 5115
5116 5116 /*
5117 5117 * Check to see if we need to allocate an anon_map structure.
5118 5118 */
5119 5119 if (svd->amp == NULL && (svd->vp == NULL || brkcow)) {
5120 5120 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
5121 5121 /*
5122 5122 * Drop the "read" lock on the segment and acquire
5123 5123 * the "write" version since we have to allocate the
5124 5124 * anon_map.
5125 5125 */
5126 5126 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5127 5127 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
5128 5128
5129 5129 if (svd->amp == NULL) {
5130 5130 svd->amp = anonmap_alloc(seg->s_size, 0, ANON_SLEEP);
5131 5131 svd->amp->a_szc = seg->s_szc;
5132 5132 }
5133 5133 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5134 5134
5135 5135 /*
5136 5136 * Start all over again since segment protections
5137 5137 * may have changed after we dropped the "read" lock.
5138 5138 */
5139 5139 goto top;
5140 5140 }
5141 5141
5142 5142 /*
5143 5143 * S_READ_NOCOW vs S_READ distinction was
5144 5144 * only needed for the code above. After
5145 5145 * that we treat it as S_READ.
5146 5146 */
5147 5147 if (rw == S_READ_NOCOW) {
5148 5148 ASSERT(type == F_SOFTLOCK);
5149 5149 ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
5150 5150 rw = S_READ;
5151 5151 }
5152 5152
5153 5153 amp = svd->amp;
5154 5154
5155 5155 /*
5156 5156 * MADV_SEQUENTIAL work is ignored for large page segments.
5157 5157 */
5158 5158 if (seg->s_szc != 0) {
5159 5159 pgsz = page_get_pagesize(seg->s_szc);
5160 5160 ASSERT(SEGVN_LOCK_HELD(seg->s_as, &svd->lock));
5161 5161 CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr);
5162 5162 if (svd->vp == NULL) {
5163 5163 err = segvn_fault_anonpages(hat, seg, lpgaddr,
5164 5164 lpgeaddr, type, rw, addr, addr + len, brkcow);
5165 5165 } else {
5166 5166 err = segvn_fault_vnodepages(hat, seg, lpgaddr,
5167 5167 lpgeaddr, type, rw, addr, addr + len, brkcow);
5168 5168 if (err == IE_RETRY) {
5169 5169 ASSERT(seg->s_szc == 0);
5170 5170 ASSERT(SEGVN_READ_HELD(seg->s_as, &svd->lock));
5171 5171 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5172 5172 goto top;
5173 5173 }
5174 5174 }
5175 5175 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5176 5176 return (err);
5177 5177 }
5178 5178
5179 5179 page = seg_page(seg, addr);
5180 5180 if (amp != NULL) {
5181 5181 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
5182 5182 anon_index = svd->anon_index + page;
5183 5183
5184 5184 if (type == F_PROT && rw == S_READ &&
5185 5185 svd->tr_state == SEGVN_TR_OFF &&
5186 5186 svd->type == MAP_PRIVATE && svd->pageprot == 0) {
5187 5187 size_t index = anon_index;
5188 5188 struct anon *ap;
5189 5189
5190 5190 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
5191 5191 /*
5192 5192 * The fast path could apply to S_WRITE also, except
5193 5193 * that the protection fault could be caused by lazy
5194 5194 * tlb flush when ro->rw. In this case, the pte is
5195 5195 * RW already. But RO in the other cpu's tlb causes
5196 5196 * the fault. Since hat_chgprot won't do anything if
5197 5197 * pte doesn't change, we may end up faulting
5198 5198 * indefinitely until the RO tlb entry gets replaced.
5199 5199 */
5200 5200 for (a = addr; a < addr + len; a += PAGESIZE, index++) {
5201 5201 anon_array_enter(amp, index, &cookie);
5202 5202 ap = anon_get_ptr(amp->ahp, index);
5203 5203 anon_array_exit(&cookie);
5204 5204 if ((ap == NULL) || (ap->an_refcnt != 1)) {
5205 5205 ANON_LOCK_EXIT(&->a_rwlock);
5206 5206 goto slow;
5207 5207 }
5208 5208 }
5209 5209 hat_chgprot(seg->s_as->a_hat, addr, len, svd->prot);
5210 5210 ANON_LOCK_EXIT(&->a_rwlock);
5211 5211 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5212 5212 return (0);
5213 5213 }
5214 5214 }
5215 5215 slow:
5216 5216
5217 5217 if (svd->vpage == NULL)
5218 5218 vpage = NULL;
5219 5219 else
5220 5220 vpage = &svd->vpage[page];
5221 5221
5222 5222 off = svd->offset + (uintptr_t)(addr - seg->s_base);
5223 5223
5224 5224 /*
5225 5225 * If MADV_SEQUENTIAL has been set for the particular page we
5226 5226 * are faulting on, free behind all pages in the segment and put
5227 5227 * them on the free list.
5228 5228 */
5229 5229
5230 5230 if ((page != 0) && fltadvice && svd->tr_state != SEGVN_TR_ON) {
5231 5231 struct vpage *vpp;
5232 5232 ulong_t fanon_index;
5233 5233 size_t fpage;
5234 5234 u_offset_t pgoff, fpgoff;
5235 5235 struct vnode *fvp;
5236 5236 struct anon *fap = NULL;
5237 5237
5238 5238 if (svd->advice == MADV_SEQUENTIAL ||
5239 5239 (svd->pageadvice &&
5240 5240 VPP_ADVICE(vpage) == MADV_SEQUENTIAL)) {
5241 5241 pgoff = off - PAGESIZE;
5242 5242 fpage = page - 1;
5243 5243 if (vpage != NULL)
5244 5244 vpp = &svd->vpage[fpage];
5245 5245 if (amp != NULL)
5246 5246 fanon_index = svd->anon_index + fpage;
5247 5247
5248 5248 while (pgoff > svd->offset) {
5249 5249 if (svd->advice != MADV_SEQUENTIAL &&
5250 5250 (!svd->pageadvice || (vpage &&
5251 5251 VPP_ADVICE(vpp) != MADV_SEQUENTIAL)))
5252 5252 break;
5253 5253
5254 5254 /*
5255 5255 * If this is an anon page, we must find the
5256 5256 * correct <vp, offset> for it
5257 5257 */
5258 5258 fap = NULL;
5259 5259 if (amp != NULL) {
5260 5260 ANON_LOCK_ENTER(&->a_rwlock,
5261 5261 RW_READER);
5262 5262 anon_array_enter(amp, fanon_index,
5263 5263 &cookie);
5264 5264 fap = anon_get_ptr(amp->ahp,
5265 5265 fanon_index);
5266 5266 if (fap != NULL) {
5267 5267 swap_xlate(fap, &fvp, &fpgoff);
5268 5268 } else {
5269 5269 fpgoff = pgoff;
5270 5270 fvp = svd->vp;
5271 5271 }
5272 5272 anon_array_exit(&cookie);
5273 5273 ANON_LOCK_EXIT(&->a_rwlock);
5274 5274 } else {
5275 5275 fpgoff = pgoff;
5276 5276 fvp = svd->vp;
5277 5277 }
5278 5278 if (fvp == NULL)
5279 5279 break; /* XXX */
5280 5280 /*
5281 5281 * Skip pages that are free or have an
5282 5282 * "exclusive" lock.
5283 5283 */
5284 5284 pp = page_lookup_nowait(fvp, fpgoff, SE_SHARED);
5285 5285 if (pp == NULL)
5286 5286 break;
5287 5287 /*
5288 5288 * We don't need the page_struct_lock to test
5289 5289 * as this is only advisory; even if we
5290 5290 * acquire it someone might race in and lock
5291 5291 * the page after we unlock and before the
5292 5292 * PUTPAGE, then VOP_PUTPAGE will do nothing.
5293 5293 */
5294 5294 if (pp->p_lckcnt == 0 && pp->p_cowcnt == 0) {
5295 5295 /*
5296 5296 * Hold the vnode before releasing
5297 5297 * the page lock to prevent it from
5298 5298 * being freed and re-used by some
5299 5299 * other thread.
5300 5300 */
5301 5301 VN_HOLD(fvp);
5302 5302 page_unlock(pp);
5303 5303 /*
5304 5304 * We should build a page list
5305 5305 * to kluster putpages XXX
5306 5306 */
5307 5307 (void) VOP_PUTPAGE(fvp,
5308 5308 (offset_t)fpgoff, PAGESIZE,
5309 5309 (B_DONTNEED|B_FREE|B_ASYNC),
5310 5310 svd->cred, NULL);
5311 5311 VN_RELE(fvp);
5312 5312 } else {
5313 5313 /*
5314 5314 * XXX - Should the loop terminate if
5315 5315 * the page is `locked'?
5316 5316 */
5317 5317 page_unlock(pp);
5318 5318 }
5319 5319 --vpp;
5320 5320 --fanon_index;
5321 5321 pgoff -= PAGESIZE;
5322 5322 }
5323 5323 }
5324 5324 }
5325 5325
5326 5326 plp = pl;
5327 5327 *plp = NULL;
5328 5328 pl_alloc_sz = 0;
5329 5329
5330 5330 /*
5331 5331 * See if we need to call VOP_GETPAGE for
5332 5332 * *any* of the range being faulted on.
5333 5333 * We can skip all of this work if there
5334 5334 * was no original vnode.
5335 5335 */
5336 5336 if (svd->vp != NULL) {
5337 5337 u_offset_t vp_off;
5338 5338 size_t vp_len;
5339 5339 struct anon *ap;
5340 5340 vnode_t *vp;
5341 5341
5342 5342 vp_off = off;
5343 5343 vp_len = len;
5344 5344
5345 5345 if (amp == NULL)
5346 5346 dogetpage = 1;
5347 5347 else {
5348 5348 /*
5349 5349 * Only acquire reader lock to prevent amp->ahp
5350 5350 * from being changed. It's ok to miss pages,
5351 5351 * hence we don't do anon_array_enter
5352 5352 */
5353 5353 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
5354 5354 ap = anon_get_ptr(amp->ahp, anon_index);
5355 5355
5356 5356 if (len <= PAGESIZE)
5357 5357 /* inline non_anon() */
5358 5358 dogetpage = (ap == NULL);
5359 5359 else
5360 5360 dogetpage = non_anon(amp->ahp, anon_index,
5361 5361 &vp_off, &vp_len);
5362 5362 ANON_LOCK_EXIT(&->a_rwlock);
5363 5363 }
5364 5364
5365 5365 if (dogetpage) {
5366 5366 enum seg_rw arw;
5367 5367 struct as *as = seg->s_as;
5368 5368
5369 5369 if (len > ptob((sizeof (pl) / sizeof (pl[0])) - 1)) {
5370 5370 /*
5371 5371 * Page list won't fit in local array,
5372 5372 * allocate one of the needed size.
5373 5373 */
5374 5374 pl_alloc_sz =
5375 5375 (btop(len) + 1) * sizeof (page_t *);
5376 5376 plp = kmem_alloc(pl_alloc_sz, KM_SLEEP);
5377 5377 plp[0] = NULL;
5378 5378 plsz = len;
5379 5379 } else if (rw == S_WRITE && svd->type == MAP_PRIVATE ||
5380 5380 svd->tr_state == SEGVN_TR_ON || rw == S_OTHER ||
5381 5381 (((size_t)(addr + PAGESIZE) <
5382 5382 (size_t)(seg->s_base + seg->s_size)) &&
5383 5383 hat_probe(as->a_hat, addr + PAGESIZE))) {
5384 5384 /*
5385 5385 * Ask VOP_GETPAGE to return the exact number
5386 5386 * of pages if
5387 5387 * (a) this is a COW fault, or
5388 5388 * (b) this is a software fault, or
5389 5389 * (c) next page is already mapped.
5390 5390 */
5391 5391 plsz = len;
5392 5392 } else {
5393 5393 /*
5394 5394 * Ask VOP_GETPAGE to return adjacent pages
5395 5395 * within the segment.
5396 5396 */
5397 5397 plsz = MIN((size_t)PVN_GETPAGE_SZ, (size_t)
5398 5398 ((seg->s_base + seg->s_size) - addr));
5399 5399 ASSERT((addr + plsz) <=
5400 5400 (seg->s_base + seg->s_size));
5401 5401 }
5402 5402
5403 5403 /*
5404 5404 * Need to get some non-anonymous pages.
5405 5405 * We need to make only one call to GETPAGE to do
5406 5406 * this to prevent certain deadlocking conditions
5407 5407 * when we are doing locking. In this case
5408 5408 * non_anon() should have picked up the smallest
5409 5409 * range which includes all the non-anonymous
5410 5410 * pages in the requested range. We have to
5411 5411 * be careful regarding which rw flag to pass in
5412 5412 * because on a private mapping, the underlying
5413 5413 * object is never allowed to be written.
5414 5414 */
5415 5415 if (rw == S_WRITE && svd->type == MAP_PRIVATE) {
5416 5416 arw = S_READ;
5417 5417 } else {
5418 5418 arw = rw;
5419 5419 }
5420 5420 vp = svd->vp;
5421 5421 TRACE_3(TR_FAC_VM, TR_SEGVN_GETPAGE,
5422 5422 "segvn_getpage:seg %p addr %p vp %p",
5423 5423 seg, addr, vp);
5424 5424 err = VOP_GETPAGE(vp, (offset_t)vp_off, vp_len,
5425 5425 &vpprot, plp, plsz, seg, addr + (vp_off - off), arw,
5426 5426 svd->cred, NULL);
5427 5427 if (err) {
5428 5428 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5429 5429 segvn_pagelist_rele(plp);
5430 5430 if (pl_alloc_sz)
5431 5431 kmem_free(plp, pl_alloc_sz);
5432 5432 return (FC_MAKE_ERR(err));
5433 5433 }
5434 5434 if (svd->type == MAP_PRIVATE)
5435 5435 vpprot &= ~PROT_WRITE;
5436 5436 }
5437 5437 }
5438 5438
5439 5439 /*
5440 5440 * N.B. at this time the plp array has all the needed non-anon
5441 5441 * pages in addition to (possibly) having some adjacent pages.
5442 5442 */
5443 5443
5444 5444 /*
5445 5445 * Always acquire the anon_array_lock to prevent
5446 5446 * 2 threads from allocating separate anon slots for
5447 5447 * the same "addr".
5448 5448 *
5449 5449 * If this is a copy-on-write fault and we don't already
5450 5450 * have the anon_array_lock, acquire it to prevent the
5451 5451 * fault routine from handling multiple copy-on-write faults
5452 5452 * on the same "addr" in the same address space.
5453 5453 *
5454 5454 * Only one thread should deal with the fault since after
5455 5455 * it is handled, the other threads can acquire a translation
5456 5456 * to the newly created private page. This prevents two or
5457 5457 * more threads from creating different private pages for the
5458 5458 * same fault.
5459 5459 *
5460 5460 * We grab "serialization" lock here if this is a MAP_PRIVATE segment
5461 5461 * to prevent deadlock between this thread and another thread
5462 5462 * which has soft-locked this page and wants to acquire serial_lock.
5463 5463 * ( bug 4026339 )
5464 5464 *
5465 5465 * The fix for bug 4026339 becomes unnecessary when using the
5466 5466 * locking scheme with per amp rwlock and a global set of hash
5467 5467 * lock, anon_array_lock. If we steal a vnode page when low
5468 5468 * on memory and upgrad the page lock through page_rename,
5469 5469 * then the page is PAGE_HANDLED, nothing needs to be done
5470 5470 * for this page after returning from segvn_faultpage.
5471 5471 *
5472 5472 * But really, the page lock should be downgraded after
5473 5473 * the stolen page is page_rename'd.
5474 5474 */
5475 5475
5476 5476 if (amp != NULL)
5477 5477 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
5478 5478
5479 5479 /*
5480 5480 * Ok, now loop over the address range and handle faults
5481 5481 */
5482 5482 for (a = addr; a < addr + len; a += PAGESIZE, off += PAGESIZE) {
5483 5483 err = segvn_faultpage(hat, seg, a, off, vpage, plp, vpprot,
5484 5484 type, rw, brkcow);
5485 5485 if (err) {
5486 5486 if (amp != NULL)
5487 5487 ANON_LOCK_EXIT(&->a_rwlock);
5488 5488 if (type == F_SOFTLOCK && a > addr) {
5489 5489 segvn_softunlock(seg, addr, (a - addr),
5490 5490 S_OTHER);
5491 5491 }
5492 5492 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5493 5493 segvn_pagelist_rele(plp);
5494 5494 if (pl_alloc_sz)
5495 5495 kmem_free(plp, pl_alloc_sz);
5496 5496 return (err);
5497 5497 }
5498 5498 if (vpage) {
5499 5499 vpage++;
5500 5500 } else if (svd->vpage) {
5501 5501 page = seg_page(seg, addr);
5502 5502 vpage = &svd->vpage[++page];
5503 5503 }
5504 5504 }
5505 5505
5506 5506 /* Didn't get pages from the underlying fs so we're done */
5507 5507 if (!dogetpage)
5508 5508 goto done;
5509 5509
5510 5510 /*
5511 5511 * Now handle any other pages in the list returned.
5512 5512 * If the page can be used, load up the translations now.
5513 5513 * Note that the for loop will only be entered if "plp"
5514 5514 * is pointing to a non-NULL page pointer which means that
5515 5515 * VOP_GETPAGE() was called and vpprot has been initialized.
5516 5516 */
5517 5517 if (svd->pageprot == 0)
5518 5518 prot = svd->prot & vpprot;
5519 5519
5520 5520
5521 5521 /*
5522 5522 * Large Files: diff should be unsigned value because we started
5523 5523 * supporting > 2GB segment sizes from 2.5.1 and when a
5524 5524 * large file of size > 2GB gets mapped to address space
5525 5525 * the diff value can be > 2GB.
5526 5526 */
5527 5527
5528 5528 for (ppp = plp; (pp = *ppp) != NULL; ppp++) {
5529 5529 size_t diff;
5530 5530 struct anon *ap;
5531 5531 int anon_index;
5532 5532 anon_sync_obj_t cookie;
5533 5533 int hat_flag = HAT_LOAD_ADV;
5534 5534
5535 5535 if (svd->flags & MAP_TEXT) {
5536 5536 hat_flag |= HAT_LOAD_TEXT;
5537 5537 }
5538 5538
5539 5539 if (pp == PAGE_HANDLED)
5540 5540 continue;
5541 5541
5542 5542 if (svd->tr_state != SEGVN_TR_ON &&
5543 5543 pp->p_offset >= svd->offset &&
5544 5544 pp->p_offset < svd->offset + seg->s_size) {
5545 5545
5546 5546 diff = pp->p_offset - svd->offset;
5547 5547
5548 5548 /*
5549 5549 * Large Files: Following is the assertion
5550 5550 * validating the above cast.
5551 5551 */
5552 5552 ASSERT(svd->vp == pp->p_vnode);
5553 5553
5554 5554 page = btop(diff);
5555 5555 if (svd->pageprot)
5556 5556 prot = VPP_PROT(&svd->vpage[page]) & vpprot;
5557 5557
5558 5558 /*
5559 5559 * Prevent other threads in the address space from
5560 5560 * creating private pages (i.e., allocating anon slots)
5561 5561 * while we are in the process of loading translations
5562 5562 * to additional pages returned by the underlying
5563 5563 * object.
5564 5564 */
5565 5565 if (amp != NULL) {
5566 5566 anon_index = svd->anon_index + page;
5567 5567 anon_array_enter(amp, anon_index, &cookie);
5568 5568 ap = anon_get_ptr(amp->ahp, anon_index);
5569 5569 }
5570 5570 if ((amp == NULL) || (ap == NULL)) {
5571 5571 if (IS_VMODSORT(pp->p_vnode) ||
5572 5572 enable_mbit_wa) {
5573 5573 if (rw == S_WRITE)
5574 5574 hat_setmod(pp);
5575 5575 else if (rw != S_OTHER &&
5576 5576 !hat_ismod(pp))
5577 5577 prot &= ~PROT_WRITE;
5578 5578 }
5579 5579 /*
5580 5580 * Skip mapping read ahead pages marked
5581 5581 * for migration, so they will get migrated
5582 5582 * properly on fault
5583 5583 */
5584 5584 ASSERT(amp == NULL ||
5585 5585 svd->rcookie == HAT_INVALID_REGION_COOKIE);
5586 5586 if ((prot & PROT_READ) && !PP_ISMIGRATE(pp)) {
5587 5587 hat_memload_region(hat,
5588 5588 seg->s_base + diff,
5589 5589 pp, prot, hat_flag,
5590 5590 svd->rcookie);
5591 5591 }
5592 5592 }
5593 5593 if (amp != NULL)
5594 5594 anon_array_exit(&cookie);
5595 5595 }
5596 5596 page_unlock(pp);
5597 5597 }
5598 5598 done:
5599 5599 if (amp != NULL)
5600 5600 ANON_LOCK_EXIT(&->a_rwlock);
5601 5601 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5602 5602 if (pl_alloc_sz)
5603 5603 kmem_free(plp, pl_alloc_sz);
5604 5604 return (0);
5605 5605 }
5606 5606
5607 5607 /*
5608 5608 * This routine is used to start I/O on pages asynchronously. XXX it will
5609 5609 * only create PAGESIZE pages. At fault time they will be relocated into
5610 5610 * larger pages.
5611 5611 */
5612 5612 static faultcode_t
5613 5613 segvn_faulta(struct seg *seg, caddr_t addr)
5614 5614 {
5615 5615 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
5616 5616 int err;
5617 5617 struct anon_map *amp;
5618 5618 vnode_t *vp;
5619 5619
5620 5620 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
5621 5621
5622 5622 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
5623 5623 if ((amp = svd->amp) != NULL) {
5624 5624 struct anon *ap;
5625 5625
5626 5626 /*
5627 5627 * Reader lock to prevent amp->ahp from being changed.
5628 5628 * This is advisory, it's ok to miss a page, so
5629 5629 * we don't do anon_array_enter lock.
5630 5630 */
5631 5631 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
5632 5632 if ((ap = anon_get_ptr(amp->ahp,
5633 5633 svd->anon_index + seg_page(seg, addr))) != NULL) {
5634 5634
5635 5635 err = anon_getpage(&ap, NULL, NULL,
5636 5636 0, seg, addr, S_READ, svd->cred);
5637 5637
5638 5638 ANON_LOCK_EXIT(&->a_rwlock);
5639 5639 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5640 5640 if (err)
5641 5641 return (FC_MAKE_ERR(err));
5642 5642 return (0);
5643 5643 }
5644 5644 ANON_LOCK_EXIT(&->a_rwlock);
5645 5645 }
5646 5646
5647 5647 if (svd->vp == NULL) {
5648 5648 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5649 5649 return (0); /* zfod page - do nothing now */
5650 5650 }
5651 5651
5652 5652 vp = svd->vp;
5653 5653 TRACE_3(TR_FAC_VM, TR_SEGVN_GETPAGE,
5654 5654 "segvn_getpage:seg %p addr %p vp %p", seg, addr, vp);
5655 5655 err = VOP_GETPAGE(vp,
5656 5656 (offset_t)(svd->offset + (uintptr_t)(addr - seg->s_base)),
5657 5657 PAGESIZE, NULL, NULL, 0, seg, addr,
5658 5658 S_OTHER, svd->cred, NULL);
5659 5659
5660 5660 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5661 5661 if (err)
5662 5662 return (FC_MAKE_ERR(err));
5663 5663 return (0);
5664 5664 }
5665 5665
5666 5666 static int
5667 5667 segvn_setprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot)
5668 5668 {
5669 5669 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
5670 5670 struct vpage *cvp, *svp, *evp;
5671 5671 struct vnode *vp;
5672 5672 size_t pgsz;
5673 5673 pgcnt_t pgcnt;
5674 5674 anon_sync_obj_t cookie;
5675 5675 int unload_done = 0;
5676 5676
5677 5677 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
5678 5678
5679 5679 if ((svd->maxprot & prot) != prot)
5680 5680 return (EACCES); /* violated maxprot */
5681 5681
5682 5682 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
5683 5683
5684 5684 /* return if prot is the same */
5685 5685 if (!svd->pageprot && svd->prot == prot) {
5686 5686 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5687 5687 return (0);
5688 5688 }
5689 5689
5690 5690 /*
5691 5691 * Since we change protections we first have to flush the cache.
5692 5692 * This makes sure all the pagelock calls have to recheck
5693 5693 * protections.
5694 5694 */
5695 5695 if (svd->softlockcnt > 0) {
5696 5696 ASSERT(svd->tr_state == SEGVN_TR_OFF);
5697 5697
5698 5698 /*
5699 5699 * If this is shared segment non 0 softlockcnt
5700 5700 * means locked pages are still in use.
5701 5701 */
5702 5702 if (svd->type == MAP_SHARED) {
5703 5703 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5704 5704 return (EAGAIN);
5705 5705 }
5706 5706
5707 5707 /*
5708 5708 * Since we do have the segvn writers lock nobody can fill
5709 5709 * the cache with entries belonging to this seg during
5710 5710 * the purge. The flush either succeeds or we still have
5711 5711 * pending I/Os.
5712 5712 */
5713 5713 segvn_purge(seg);
5714 5714 if (svd->softlockcnt > 0) {
5715 5715 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5716 5716 return (EAGAIN);
5717 5717 }
5718 5718 }
5719 5719
5720 5720 if (HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
5721 5721 ASSERT(svd->amp == NULL);
5722 5722 ASSERT(svd->tr_state == SEGVN_TR_OFF);
5723 5723 hat_leave_region(seg->s_as->a_hat, svd->rcookie,
5724 5724 HAT_REGION_TEXT);
5725 5725 svd->rcookie = HAT_INVALID_REGION_COOKIE;
5726 5726 unload_done = 1;
5727 5727 } else if (svd->tr_state == SEGVN_TR_INIT) {
5728 5728 svd->tr_state = SEGVN_TR_OFF;
5729 5729 } else if (svd->tr_state == SEGVN_TR_ON) {
5730 5730 ASSERT(svd->amp != NULL);
5731 5731 segvn_textunrepl(seg, 0);
5732 5732 ASSERT(svd->amp == NULL && svd->tr_state == SEGVN_TR_OFF);
5733 5733 unload_done = 1;
5734 5734 }
5735 5735
5736 5736 if ((prot & PROT_WRITE) && svd->type == MAP_SHARED &&
5737 5737 svd->vp != NULL && (svd->vp->v_flag & VVMEXEC)) {
5738 5738 ASSERT(vn_is_mapped(svd->vp, V_WRITE));
5739 5739 segvn_inval_trcache(svd->vp);
5740 5740 }
5741 5741 if (seg->s_szc != 0) {
5742 5742 int err;
5743 5743 pgsz = page_get_pagesize(seg->s_szc);
5744 5744 pgcnt = pgsz >> PAGESHIFT;
5745 5745 ASSERT(IS_P2ALIGNED(pgcnt, pgcnt));
5746 5746 if (!IS_P2ALIGNED(addr, pgsz) || !IS_P2ALIGNED(len, pgsz)) {
5747 5747 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5748 5748 ASSERT(seg->s_base != addr || seg->s_size != len);
5749 5749 /*
5750 5750 * If we are holding the as lock as a reader then
5751 5751 * we need to return IE_RETRY and let the as
5752 5752 * layer drop and re-acquire the lock as a writer.
5753 5753 */
5754 5754 if (AS_READ_HELD(seg->s_as, &seg->s_as->a_lock))
5755 5755 return (IE_RETRY);
5756 5756 VM_STAT_ADD(segvnvmstats.demoterange[1]);
5757 5757 if (svd->type == MAP_PRIVATE || svd->vp != NULL) {
5758 5758 err = segvn_demote_range(seg, addr, len,
5759 5759 SDR_END, 0);
5760 5760 } else {
5761 5761 uint_t szcvec = map_pgszcvec(seg->s_base,
5762 5762 pgsz, (uintptr_t)seg->s_base,
5763 5763 (svd->flags & MAP_TEXT), MAPPGSZC_SHM, 0);
5764 5764 err = segvn_demote_range(seg, addr, len,
5765 5765 SDR_END, szcvec);
5766 5766 }
5767 5767 if (err == 0)
5768 5768 return (IE_RETRY);
5769 5769 if (err == ENOMEM)
5770 5770 return (IE_NOMEM);
5771 5771 return (err);
5772 5772 }
5773 5773 }
5774 5774
5775 5775
5776 5776 /*
5777 5777 * If it's a private mapping and we're making it writable then we
5778 5778 * may have to reserve the additional swap space now. If we are
5779 5779 * making writable only a part of the segment then we use its vpage
5780 5780 * array to keep a record of the pages for which we have reserved
5781 5781 * swap. In this case we set the pageswap field in the segment's
5782 5782 * segvn structure to record this.
5783 5783 *
5784 5784 * If it's a private mapping to a file (i.e., vp != NULL) and we're
5785 5785 * removing write permission on the entire segment and we haven't
5786 5786 * modified any pages, we can release the swap space.
5787 5787 */
5788 5788 if (svd->type == MAP_PRIVATE) {
5789 5789 if (prot & PROT_WRITE) {
5790 5790 if (!(svd->flags & MAP_NORESERVE) &&
5791 5791 !(svd->swresv && svd->pageswap == 0)) {
5792 5792 size_t sz = 0;
5793 5793
5794 5794 /*
5795 5795 * Start by determining how much swap
5796 5796 * space is required.
5797 5797 */
5798 5798 if (addr == seg->s_base &&
5799 5799 len == seg->s_size &&
5800 5800 svd->pageswap == 0) {
5801 5801 /* The whole segment */
5802 5802 sz = seg->s_size;
5803 5803 } else {
5804 5804 /*
5805 5805 * Make sure that the vpage array
5806 5806 * exists, and make a note of the
5807 5807 * range of elements corresponding
5808 5808 * to len.
5809 5809 */
5810 5810 segvn_vpage(seg);
5811 5811 if (svd->vpage == NULL) {
5812 5812 SEGVN_LOCK_EXIT(seg->s_as,
5813 5813 &svd->lock);
5814 5814 return (ENOMEM);
5815 5815 }
5816 5816 svp = &svd->vpage[seg_page(seg, addr)];
5817 5817 evp = &svd->vpage[seg_page(seg,
5818 5818 addr + len)];
5819 5819
5820 5820 if (svd->pageswap == 0) {
5821 5821 /*
5822 5822 * This is the first time we've
5823 5823 * asked for a part of this
5824 5824 * segment, so we need to
5825 5825 * reserve everything we've
5826 5826 * been asked for.
5827 5827 */
5828 5828 sz = len;
5829 5829 } else {
5830 5830 /*
5831 5831 * We have to count the number
5832 5832 * of pages required.
5833 5833 */
5834 5834 for (cvp = svp; cvp < evp;
5835 5835 cvp++) {
5836 5836 if (!VPP_ISSWAPRES(cvp))
5837 5837 sz++;
5838 5838 }
5839 5839 sz <<= PAGESHIFT;
5840 5840 }
5841 5841 }
5842 5842
5843 5843 /* Try to reserve the necessary swap. */
5844 5844 if (anon_resv_zone(sz,
5845 5845 seg->s_as->a_proc->p_zone) == 0) {
5846 5846 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5847 5847 return (IE_NOMEM);
5848 5848 }
5849 5849
5850 5850 /*
5851 5851 * Make a note of how much swap space
5852 5852 * we've reserved.
5853 5853 */
5854 5854 if (svd->pageswap == 0 && sz == seg->s_size) {
5855 5855 svd->swresv = sz;
5856 5856 } else {
5857 5857 ASSERT(svd->vpage != NULL);
5858 5858 svd->swresv += sz;
5859 5859 svd->pageswap = 1;
5860 5860 for (cvp = svp; cvp < evp; cvp++) {
5861 5861 if (!VPP_ISSWAPRES(cvp))
5862 5862 VPP_SETSWAPRES(cvp);
5863 5863 }
5864 5864 }
5865 5865 }
5866 5866 } else {
5867 5867 /*
5868 5868 * Swap space is released only if this segment
5869 5869 * does not map anonymous memory, since read faults
5870 5870 * on such segments still need an anon slot to read
5871 5871 * in the data.
5872 5872 */
5873 5873 if (svd->swresv != 0 && svd->vp != NULL &&
5874 5874 svd->amp == NULL && addr == seg->s_base &&
5875 5875 len == seg->s_size && svd->pageprot == 0) {
5876 5876 ASSERT(svd->pageswap == 0);
5877 5877 anon_unresv_zone(svd->swresv,
5878 5878 seg->s_as->a_proc->p_zone);
5879 5879 svd->swresv = 0;
5880 5880 TRACE_3(TR_FAC_VM, TR_ANON_PROC,
5881 5881 "anon proc:%p %lu %u", seg, 0, 0);
5882 5882 }
5883 5883 }
5884 5884 }
5885 5885
5886 5886 if (addr == seg->s_base && len == seg->s_size && svd->vpage == NULL) {
5887 5887 if (svd->prot == prot) {
5888 5888 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5889 5889 return (0); /* all done */
5890 5890 }
5891 5891 svd->prot = (uchar_t)prot;
5892 5892 } else if (svd->type == MAP_PRIVATE) {
5893 5893 struct anon *ap = NULL;
5894 5894 page_t *pp;
5895 5895 u_offset_t offset, off;
5896 5896 struct anon_map *amp;
5897 5897 ulong_t anon_idx = 0;
5898 5898
5899 5899 /*
5900 5900 * A vpage structure exists or else the change does not
5901 5901 * involve the entire segment. Establish a vpage structure
5902 5902 * if none is there. Then, for each page in the range,
5903 5903 * adjust its individual permissions. Note that write-
5904 5904 * enabling a MAP_PRIVATE page can affect the claims for
5905 5905 * locked down memory. Overcommitting memory terminates
5906 5906 * the operation.
5907 5907 */
5908 5908 segvn_vpage(seg);
5909 5909 if (svd->vpage == NULL) {
5910 5910 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
5911 5911 return (ENOMEM);
5912 5912 }
5913 5913 svd->pageprot = 1;
5914 5914 if ((amp = svd->amp) != NULL) {
5915 5915 anon_idx = svd->anon_index + seg_page(seg, addr);
5916 5916 ASSERT(seg->s_szc == 0 ||
5917 5917 IS_P2ALIGNED(anon_idx, pgcnt));
5918 5918 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
5919 5919 }
5920 5920
5921 5921 offset = svd->offset + (uintptr_t)(addr - seg->s_base);
5922 5922 evp = &svd->vpage[seg_page(seg, addr + len)];
5923 5923
5924 5924 /*
5925 5925 * See Statement at the beginning of segvn_lockop regarding
5926 5926 * the way cowcnts and lckcnts are handled.
5927 5927 */
5928 5928 for (svp = &svd->vpage[seg_page(seg, addr)]; svp < evp; svp++) {
5929 5929
5930 5930 if (seg->s_szc != 0) {
5931 5931 if (amp != NULL) {
5932 5932 anon_array_enter(amp, anon_idx,
5933 5933 &cookie);
5934 5934 }
5935 5935 if (IS_P2ALIGNED(anon_idx, pgcnt) &&
5936 5936 !segvn_claim_pages(seg, svp, offset,
5937 5937 anon_idx, prot)) {
5938 5938 if (amp != NULL) {
5939 5939 anon_array_exit(&cookie);
5940 5940 }
5941 5941 break;
5942 5942 }
5943 5943 if (amp != NULL) {
5944 5944 anon_array_exit(&cookie);
5945 5945 }
5946 5946 anon_idx++;
5947 5947 } else {
5948 5948 if (amp != NULL) {
5949 5949 anon_array_enter(amp, anon_idx,
5950 5950 &cookie);
5951 5951 ap = anon_get_ptr(amp->ahp, anon_idx++);
5952 5952 }
5953 5953
5954 5954 if (VPP_ISPPLOCK(svp) &&
5955 5955 VPP_PROT(svp) != prot) {
5956 5956
5957 5957 if (amp == NULL || ap == NULL) {
5958 5958 vp = svd->vp;
5959 5959 off = offset;
5960 5960 } else
5961 5961 swap_xlate(ap, &vp, &off);
5962 5962 if (amp != NULL)
5963 5963 anon_array_exit(&cookie);
5964 5964
5965 5965 if ((pp = page_lookup(vp, off,
5966 5966 SE_SHARED)) == NULL) {
5967 5967 panic("segvn_setprot: no page");
5968 5968 /*NOTREACHED*/
5969 5969 }
5970 5970 ASSERT(seg->s_szc == 0);
5971 5971 if ((VPP_PROT(svp) ^ prot) &
5972 5972 PROT_WRITE) {
5973 5973 if (prot & PROT_WRITE) {
5974 5974 if (!page_addclaim(
5975 5975 pp)) {
5976 5976 page_unlock(pp);
5977 5977 break;
5978 5978 }
5979 5979 } else {
5980 5980 if (!page_subclaim(
5981 5981 pp)) {
5982 5982 page_unlock(pp);
5983 5983 break;
5984 5984 }
5985 5985 }
5986 5986 }
5987 5987 page_unlock(pp);
5988 5988 } else if (amp != NULL)
5989 5989 anon_array_exit(&cookie);
5990 5990 }
5991 5991 VPP_SETPROT(svp, prot);
5992 5992 offset += PAGESIZE;
5993 5993 }
5994 5994 if (amp != NULL)
5995 5995 ANON_LOCK_EXIT(&->a_rwlock);
5996 5996
5997 5997 /*
5998 5998 * Did we terminate prematurely? If so, simply unload
5999 5999 * the translations to the things we've updated so far.
6000 6000 */
6001 6001 if (svp != evp) {
6002 6002 if (unload_done) {
6003 6003 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
6004 6004 return (IE_NOMEM);
6005 6005 }
6006 6006 len = (svp - &svd->vpage[seg_page(seg, addr)]) *
6007 6007 PAGESIZE;
6008 6008 ASSERT(seg->s_szc == 0 || IS_P2ALIGNED(len, pgsz));
6009 6009 if (len != 0)
6010 6010 hat_unload(seg->s_as->a_hat, addr,
6011 6011 len, HAT_UNLOAD);
6012 6012 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
6013 6013 return (IE_NOMEM);
6014 6014 }
6015 6015 } else {
6016 6016 segvn_vpage(seg);
6017 6017 if (svd->vpage == NULL) {
6018 6018 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
6019 6019 return (ENOMEM);
6020 6020 }
6021 6021 svd->pageprot = 1;
6022 6022 evp = &svd->vpage[seg_page(seg, addr + len)];
6023 6023 for (svp = &svd->vpage[seg_page(seg, addr)]; svp < evp; svp++) {
6024 6024 VPP_SETPROT(svp, prot);
6025 6025 }
6026 6026 }
6027 6027
6028 6028 if (unload_done) {
6029 6029 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
6030 6030 return (0);
6031 6031 }
6032 6032
6033 6033 if (((prot & PROT_WRITE) != 0 &&
6034 6034 (svd->vp != NULL || svd->type == MAP_PRIVATE)) ||
6035 6035 (prot & ~PROT_USER) == PROT_NONE) {
6036 6036 /*
6037 6037 * Either private or shared data with write access (in
6038 6038 * which case we need to throw out all former translations
6039 6039 * so that we get the right translations set up on fault
6040 6040 * and we don't allow write access to any copy-on-write pages
6041 6041 * that might be around or to prevent write access to pages
6042 6042 * representing holes in a file), or we don't have permission
6043 6043 * to access the memory at all (in which case we have to
6044 6044 * unload any current translations that might exist).
6045 6045 */
6046 6046 hat_unload(seg->s_as->a_hat, addr, len, HAT_UNLOAD);
6047 6047 } else {
6048 6048 /*
6049 6049 * A shared mapping or a private mapping in which write
6050 6050 * protection is going to be denied - just change all the
6051 6051 * protections over the range of addresses in question.
6052 6052 * segvn does not support any other attributes other
6053 6053 * than prot so we can use hat_chgattr.
|
↓ open down ↓ |
6053 lines elided |
↑ open up ↑ |
6054 6054 */
6055 6055 hat_chgattr(seg->s_as->a_hat, addr, len, prot);
6056 6056 }
6057 6057
6058 6058 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
6059 6059
6060 6060 return (0);
6061 6061 }
6062 6062
6063 6063 /*
6064 - * segvn_setpagesize is called via SEGOP_SETPAGESIZE from as_setpagesize,
6064 + * segvn_setpagesize is called via segop_setpagesize from as_setpagesize,
6065 6065 * to determine if the seg is capable of mapping the requested szc.
6066 6066 */
6067 6067 static int
6068 6068 segvn_setpagesize(struct seg *seg, caddr_t addr, size_t len, uint_t szc)
6069 6069 {
6070 6070 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6071 6071 struct segvn_data *nsvd;
6072 6072 struct anon_map *amp = svd->amp;
6073 6073 struct seg *nseg;
6074 6074 caddr_t eaddr = addr + len, a;
6075 6075 size_t pgsz = page_get_pagesize(szc);
6076 6076 pgcnt_t pgcnt = page_get_pagecnt(szc);
6077 6077 int err;
6078 6078 u_offset_t off = svd->offset + (uintptr_t)(addr - seg->s_base);
6079 6079
6080 6080 ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
6081 6081 ASSERT(addr >= seg->s_base && eaddr <= seg->s_base + seg->s_size);
6082 6082
6083 6083 if (seg->s_szc == szc || segvn_lpg_disable != 0) {
6084 6084 return (0);
6085 6085 }
6086 6086
6087 6087 /*
6088 6088 * addr should always be pgsz aligned but eaddr may be misaligned if
6089 6089 * it's at the end of the segment.
6090 6090 *
6091 6091 * XXX we should assert this condition since as_setpagesize() logic
6092 6092 * guarantees it.
6093 6093 */
6094 6094 if (!IS_P2ALIGNED(addr, pgsz) ||
6095 6095 (!IS_P2ALIGNED(eaddr, pgsz) &&
6096 6096 eaddr != seg->s_base + seg->s_size)) {
6097 6097
6098 6098 segvn_setpgsz_align_err++;
6099 6099 return (EINVAL);
6100 6100 }
6101 6101
6102 6102 if (amp != NULL && svd->type == MAP_SHARED) {
6103 6103 ulong_t an_idx = svd->anon_index + seg_page(seg, addr);
6104 6104 if (!IS_P2ALIGNED(an_idx, pgcnt)) {
6105 6105
6106 6106 segvn_setpgsz_anon_align_err++;
6107 6107 return (EINVAL);
6108 6108 }
6109 6109 }
6110 6110
6111 6111 if ((svd->flags & MAP_NORESERVE) || seg->s_as == &kas ||
6112 6112 szc > segvn_maxpgszc) {
6113 6113 return (EINVAL);
6114 6114 }
6115 6115
6116 6116 /* paranoid check */
6117 6117 if (svd->vp != NULL &&
6118 6118 (IS_SWAPFSVP(svd->vp) || VN_ISKAS(svd->vp))) {
6119 6119 return (EINVAL);
6120 6120 }
6121 6121
6122 6122 if (seg->s_szc == 0 && svd->vp != NULL &&
6123 6123 map_addr_vacalign_check(addr, off)) {
6124 6124 return (EINVAL);
6125 6125 }
6126 6126
6127 6127 /*
6128 6128 * Check that protections are the same within new page
6129 6129 * size boundaries.
6130 6130 */
6131 6131 if (svd->pageprot) {
6132 6132 for (a = addr; a < eaddr; a += pgsz) {
6133 6133 if ((a + pgsz) > eaddr) {
6134 6134 if (!sameprot(seg, a, eaddr - a)) {
6135 6135 return (EINVAL);
6136 6136 }
6137 6137 } else {
6138 6138 if (!sameprot(seg, a, pgsz)) {
6139 6139 return (EINVAL);
6140 6140 }
6141 6141 }
6142 6142 }
6143 6143 }
6144 6144
6145 6145 /*
6146 6146 * Since we are changing page size we first have to flush
6147 6147 * the cache. This makes sure all the pagelock calls have
6148 6148 * to recheck protections.
6149 6149 */
6150 6150 if (svd->softlockcnt > 0) {
6151 6151 ASSERT(svd->tr_state == SEGVN_TR_OFF);
6152 6152
6153 6153 /*
6154 6154 * If this is shared segment non 0 softlockcnt
6155 6155 * means locked pages are still in use.
6156 6156 */
6157 6157 if (svd->type == MAP_SHARED) {
6158 6158 return (EAGAIN);
6159 6159 }
6160 6160
6161 6161 /*
6162 6162 * Since we do have the segvn writers lock nobody can fill
6163 6163 * the cache with entries belonging to this seg during
6164 6164 * the purge. The flush either succeeds or we still have
6165 6165 * pending I/Os.
6166 6166 */
6167 6167 segvn_purge(seg);
6168 6168 if (svd->softlockcnt > 0) {
6169 6169 return (EAGAIN);
6170 6170 }
6171 6171 }
6172 6172
6173 6173 if (HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
6174 6174 ASSERT(svd->amp == NULL);
6175 6175 ASSERT(svd->tr_state == SEGVN_TR_OFF);
6176 6176 hat_leave_region(seg->s_as->a_hat, svd->rcookie,
6177 6177 HAT_REGION_TEXT);
6178 6178 svd->rcookie = HAT_INVALID_REGION_COOKIE;
6179 6179 } else if (svd->tr_state == SEGVN_TR_INIT) {
6180 6180 svd->tr_state = SEGVN_TR_OFF;
6181 6181 } else if (svd->tr_state == SEGVN_TR_ON) {
6182 6182 ASSERT(svd->amp != NULL);
6183 6183 segvn_textunrepl(seg, 1);
6184 6184 ASSERT(svd->amp == NULL && svd->tr_state == SEGVN_TR_OFF);
6185 6185 amp = NULL;
6186 6186 }
6187 6187
6188 6188 /*
6189 6189 * Operation for sub range of existing segment.
6190 6190 */
6191 6191 if (addr != seg->s_base || eaddr != (seg->s_base + seg->s_size)) {
6192 6192 if (szc < seg->s_szc) {
6193 6193 VM_STAT_ADD(segvnvmstats.demoterange[2]);
6194 6194 err = segvn_demote_range(seg, addr, len, SDR_RANGE, 0);
6195 6195 if (err == 0) {
6196 6196 return (IE_RETRY);
6197 6197 }
6198 6198 if (err == ENOMEM) {
6199 6199 return (IE_NOMEM);
6200 6200 }
6201 6201 return (err);
6202 6202 }
6203 6203 if (addr != seg->s_base) {
6204 6204 nseg = segvn_split_seg(seg, addr);
6205 6205 if (eaddr != (nseg->s_base + nseg->s_size)) {
6206 6206 /* eaddr is szc aligned */
6207 6207 (void) segvn_split_seg(nseg, eaddr);
6208 6208 }
6209 6209 return (IE_RETRY);
6210 6210 }
6211 6211 if (eaddr != (seg->s_base + seg->s_size)) {
6212 6212 /* eaddr is szc aligned */
6213 6213 (void) segvn_split_seg(seg, eaddr);
6214 6214 }
6215 6215 return (IE_RETRY);
6216 6216 }
6217 6217
6218 6218 /*
6219 6219 * Break any low level sharing and reset seg->s_szc to 0.
6220 6220 */
6221 6221 if ((err = segvn_clrszc(seg)) != 0) {
6222 6222 if (err == ENOMEM) {
6223 6223 err = IE_NOMEM;
6224 6224 }
6225 6225 return (err);
6226 6226 }
6227 6227 ASSERT(seg->s_szc == 0);
6228 6228
6229 6229 /*
6230 6230 * If the end of the current segment is not pgsz aligned
6231 6231 * then attempt to concatenate with the next segment.
6232 6232 */
6233 6233 if (!IS_P2ALIGNED(eaddr, pgsz)) {
6234 6234 nseg = AS_SEGNEXT(seg->s_as, seg);
6235 6235 if (nseg == NULL || nseg == seg || eaddr != nseg->s_base) {
6236 6236 return (ENOMEM);
6237 6237 }
6238 6238 if (nseg->s_ops != &segvn_ops) {
6239 6239 return (EINVAL);
6240 6240 }
6241 6241 nsvd = (struct segvn_data *)nseg->s_data;
6242 6242 if (nsvd->softlockcnt > 0) {
6243 6243 /*
6244 6244 * If this is shared segment non 0 softlockcnt
6245 6245 * means locked pages are still in use.
6246 6246 */
6247 6247 if (nsvd->type == MAP_SHARED) {
6248 6248 return (EAGAIN);
6249 6249 }
6250 6250 segvn_purge(nseg);
6251 6251 if (nsvd->softlockcnt > 0) {
6252 6252 return (EAGAIN);
6253 6253 }
6254 6254 }
6255 6255 err = segvn_clrszc(nseg);
6256 6256 if (err == ENOMEM) {
6257 6257 err = IE_NOMEM;
6258 6258 }
6259 6259 if (err != 0) {
6260 6260 return (err);
6261 6261 }
6262 6262 ASSERT(nsvd->rcookie == HAT_INVALID_REGION_COOKIE);
6263 6263 err = segvn_concat(seg, nseg, 1);
6264 6264 if (err == -1) {
6265 6265 return (EINVAL);
6266 6266 }
6267 6267 if (err == -2) {
6268 6268 return (IE_NOMEM);
6269 6269 }
6270 6270 return (IE_RETRY);
6271 6271 }
6272 6272
6273 6273 /*
6274 6274 * May need to re-align anon array to
6275 6275 * new szc.
6276 6276 */
6277 6277 if (amp != NULL) {
6278 6278 if (!IS_P2ALIGNED(svd->anon_index, pgcnt)) {
6279 6279 struct anon_hdr *nahp;
6280 6280
6281 6281 ASSERT(svd->type == MAP_PRIVATE);
6282 6282
6283 6283 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
6284 6284 ASSERT(amp->refcnt == 1);
6285 6285 nahp = anon_create(btop(amp->size), ANON_NOSLEEP);
6286 6286 if (nahp == NULL) {
6287 6287 ANON_LOCK_EXIT(&->a_rwlock);
6288 6288 return (IE_NOMEM);
6289 6289 }
6290 6290 if (anon_copy_ptr(amp->ahp, svd->anon_index,
6291 6291 nahp, 0, btop(seg->s_size), ANON_NOSLEEP)) {
6292 6292 anon_release(nahp, btop(amp->size));
6293 6293 ANON_LOCK_EXIT(&->a_rwlock);
6294 6294 return (IE_NOMEM);
6295 6295 }
6296 6296 anon_release(amp->ahp, btop(amp->size));
6297 6297 amp->ahp = nahp;
6298 6298 svd->anon_index = 0;
6299 6299 ANON_LOCK_EXIT(&->a_rwlock);
6300 6300 }
6301 6301 }
6302 6302 if (svd->vp != NULL && szc != 0) {
6303 6303 struct vattr va;
6304 6304 u_offset_t eoffpage = svd->offset;
6305 6305 va.va_mask = AT_SIZE;
6306 6306 eoffpage += seg->s_size;
6307 6307 eoffpage = btopr(eoffpage);
6308 6308 if (VOP_GETATTR(svd->vp, &va, 0, svd->cred, NULL) != 0) {
6309 6309 segvn_setpgsz_getattr_err++;
6310 6310 return (EINVAL);
6311 6311 }
6312 6312 if (btopr(va.va_size) < eoffpage) {
6313 6313 segvn_setpgsz_eof_err++;
6314 6314 return (EINVAL);
6315 6315 }
6316 6316 if (amp != NULL) {
6317 6317 /*
6318 6318 * anon_fill_cow_holes() may call VOP_GETPAGE().
6319 6319 * don't take anon map lock here to avoid holding it
6320 6320 * across VOP_GETPAGE() calls that may call back into
6321 6321 * segvn for klsutering checks. We don't really need
6322 6322 * anon map lock here since it's a private segment and
6323 6323 * we hold as level lock as writers.
6324 6324 */
6325 6325 if ((err = anon_fill_cow_holes(seg, seg->s_base,
6326 6326 amp->ahp, svd->anon_index, svd->vp, svd->offset,
6327 6327 seg->s_size, szc, svd->prot, svd->vpage,
6328 6328 svd->cred)) != 0) {
6329 6329 return (EINVAL);
6330 6330 }
6331 6331 }
6332 6332 segvn_setvnode_mpss(svd->vp);
6333 6333 }
6334 6334
6335 6335 if (amp != NULL) {
6336 6336 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
6337 6337 if (svd->type == MAP_PRIVATE) {
6338 6338 amp->a_szc = szc;
6339 6339 } else if (szc > amp->a_szc) {
6340 6340 amp->a_szc = szc;
6341 6341 }
6342 6342 ANON_LOCK_EXIT(&->a_rwlock);
6343 6343 }
6344 6344
6345 6345 seg->s_szc = szc;
6346 6346
6347 6347 return (0);
6348 6348 }
6349 6349
6350 6350 static int
6351 6351 segvn_clrszc(struct seg *seg)
6352 6352 {
6353 6353 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6354 6354 struct anon_map *amp = svd->amp;
6355 6355 size_t pgsz;
6356 6356 pgcnt_t pages;
6357 6357 int err = 0;
6358 6358 caddr_t a = seg->s_base;
6359 6359 caddr_t ea = a + seg->s_size;
6360 6360 ulong_t an_idx = svd->anon_index;
6361 6361 vnode_t *vp = svd->vp;
6362 6362 struct vpage *vpage = svd->vpage;
6363 6363 page_t *anon_pl[1 + 1], *pp;
6364 6364 struct anon *ap, *oldap;
6365 6365 uint_t prot = svd->prot, vpprot;
6366 6366 int pageflag = 0;
6367 6367
6368 6368 ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock) ||
6369 6369 SEGVN_WRITE_HELD(seg->s_as, &svd->lock));
6370 6370 ASSERT(svd->softlockcnt == 0);
6371 6371
6372 6372 if (vp == NULL && amp == NULL) {
6373 6373 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
6374 6374 seg->s_szc = 0;
6375 6375 return (0);
6376 6376 }
6377 6377
6378 6378 if (HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
6379 6379 ASSERT(svd->amp == NULL);
6380 6380 ASSERT(svd->tr_state == SEGVN_TR_OFF);
6381 6381 hat_leave_region(seg->s_as->a_hat, svd->rcookie,
6382 6382 HAT_REGION_TEXT);
6383 6383 svd->rcookie = HAT_INVALID_REGION_COOKIE;
6384 6384 } else if (svd->tr_state == SEGVN_TR_ON) {
6385 6385 ASSERT(svd->amp != NULL);
6386 6386 segvn_textunrepl(seg, 1);
6387 6387 ASSERT(svd->amp == NULL && svd->tr_state == SEGVN_TR_OFF);
6388 6388 amp = NULL;
6389 6389 } else {
6390 6390 if (svd->tr_state != SEGVN_TR_OFF) {
6391 6391 ASSERT(svd->tr_state == SEGVN_TR_INIT);
6392 6392 svd->tr_state = SEGVN_TR_OFF;
6393 6393 }
6394 6394
6395 6395 /*
6396 6396 * do HAT_UNLOAD_UNMAP since we are changing the pagesize.
6397 6397 * unload argument is 0 when we are freeing the segment
6398 6398 * and unload was already done.
6399 6399 */
6400 6400 hat_unload(seg->s_as->a_hat, seg->s_base, seg->s_size,
6401 6401 HAT_UNLOAD_UNMAP);
6402 6402 }
6403 6403
6404 6404 if (amp == NULL || svd->type == MAP_SHARED) {
6405 6405 seg->s_szc = 0;
6406 6406 return (0);
6407 6407 }
6408 6408
6409 6409 pgsz = page_get_pagesize(seg->s_szc);
6410 6410 pages = btop(pgsz);
6411 6411
6412 6412 /*
6413 6413 * XXX anon rwlock is not really needed because this is a
6414 6414 * private segment and we are writers.
6415 6415 */
6416 6416 ANON_LOCK_ENTER(&->a_rwlock, RW_WRITER);
6417 6417
6418 6418 for (; a < ea; a += pgsz, an_idx += pages) {
6419 6419 if ((oldap = anon_get_ptr(amp->ahp, an_idx)) != NULL) {
6420 6420 ASSERT(vpage != NULL || svd->pageprot == 0);
6421 6421 if (vpage != NULL) {
6422 6422 ASSERT(sameprot(seg, a, pgsz));
6423 6423 prot = VPP_PROT(vpage);
6424 6424 pageflag = VPP_ISPPLOCK(vpage) ? LOCK_PAGE : 0;
6425 6425 }
6426 6426 if (seg->s_szc != 0) {
6427 6427 ASSERT(vp == NULL || anon_pages(amp->ahp,
6428 6428 an_idx, pages) == pages);
6429 6429 if ((err = anon_map_demotepages(amp, an_idx,
6430 6430 seg, a, prot, vpage, svd->cred)) != 0) {
6431 6431 goto out;
6432 6432 }
6433 6433 } else {
6434 6434 if (oldap->an_refcnt == 1) {
6435 6435 continue;
6436 6436 }
6437 6437 if ((err = anon_getpage(&oldap, &vpprot,
6438 6438 anon_pl, PAGESIZE, seg, a, S_READ,
6439 6439 svd->cred))) {
6440 6440 goto out;
6441 6441 }
6442 6442 if ((pp = anon_private(&ap, seg, a, prot,
6443 6443 anon_pl[0], pageflag, svd->cred)) == NULL) {
6444 6444 err = ENOMEM;
6445 6445 goto out;
6446 6446 }
6447 6447 anon_decref(oldap);
6448 6448 (void) anon_set_ptr(amp->ahp, an_idx, ap,
6449 6449 ANON_SLEEP);
6450 6450 page_unlock(pp);
6451 6451 }
6452 6452 }
6453 6453 vpage = (vpage == NULL) ? NULL : vpage + pages;
6454 6454 }
6455 6455
6456 6456 amp->a_szc = 0;
6457 6457 seg->s_szc = 0;
6458 6458 out:
6459 6459 ANON_LOCK_EXIT(&->a_rwlock);
6460 6460 return (err);
6461 6461 }
6462 6462
6463 6463 static int
6464 6464 segvn_claim_pages(
6465 6465 struct seg *seg,
6466 6466 struct vpage *svp,
6467 6467 u_offset_t off,
6468 6468 ulong_t anon_idx,
6469 6469 uint_t prot)
6470 6470 {
6471 6471 pgcnt_t pgcnt = page_get_pagecnt(seg->s_szc);
6472 6472 size_t ppasize = (pgcnt + 1) * sizeof (page_t *);
6473 6473 page_t **ppa;
6474 6474 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6475 6475 struct anon_map *amp = svd->amp;
6476 6476 struct vpage *evp = svp + pgcnt;
6477 6477 caddr_t addr = ((uintptr_t)(svp - svd->vpage) << PAGESHIFT)
6478 6478 + seg->s_base;
6479 6479 struct anon *ap;
6480 6480 struct vnode *vp = svd->vp;
6481 6481 page_t *pp;
6482 6482 pgcnt_t pg_idx, i;
6483 6483 int err = 0;
6484 6484 anoff_t aoff;
6485 6485 int anon = (amp != NULL) ? 1 : 0;
6486 6486
6487 6487 ASSERT(svd->type == MAP_PRIVATE);
6488 6488 ASSERT(svd->vpage != NULL);
6489 6489 ASSERT(seg->s_szc != 0);
6490 6490 ASSERT(IS_P2ALIGNED(pgcnt, pgcnt));
6491 6491 ASSERT(amp == NULL || IS_P2ALIGNED(anon_idx, pgcnt));
6492 6492 ASSERT(sameprot(seg, addr, pgcnt << PAGESHIFT));
6493 6493
6494 6494 if (VPP_PROT(svp) == prot)
6495 6495 return (1);
6496 6496 if (!((VPP_PROT(svp) ^ prot) & PROT_WRITE))
6497 6497 return (1);
6498 6498
6499 6499 ppa = kmem_alloc(ppasize, KM_SLEEP);
6500 6500 if (anon && vp != NULL) {
6501 6501 if (anon_get_ptr(amp->ahp, anon_idx) == NULL) {
6502 6502 anon = 0;
6503 6503 ASSERT(!anon_pages(amp->ahp, anon_idx, pgcnt));
6504 6504 }
6505 6505 ASSERT(!anon ||
6506 6506 anon_pages(amp->ahp, anon_idx, pgcnt) == pgcnt);
6507 6507 }
6508 6508
6509 6509 for (*ppa = NULL, pg_idx = 0; svp < evp; svp++, anon_idx++) {
6510 6510 if (!VPP_ISPPLOCK(svp))
6511 6511 continue;
6512 6512 if (anon) {
6513 6513 ap = anon_get_ptr(amp->ahp, anon_idx);
6514 6514 if (ap == NULL) {
6515 6515 panic("segvn_claim_pages: no anon slot");
6516 6516 }
6517 6517 swap_xlate(ap, &vp, &aoff);
6518 6518 off = (u_offset_t)aoff;
6519 6519 }
6520 6520 ASSERT(vp != NULL);
6521 6521 if ((pp = page_lookup(vp,
6522 6522 (u_offset_t)off, SE_SHARED)) == NULL) {
6523 6523 panic("segvn_claim_pages: no page");
6524 6524 }
6525 6525 ppa[pg_idx++] = pp;
6526 6526 off += PAGESIZE;
6527 6527 }
6528 6528
6529 6529 if (ppa[0] == NULL) {
6530 6530 kmem_free(ppa, ppasize);
6531 6531 return (1);
6532 6532 }
6533 6533
6534 6534 ASSERT(pg_idx <= pgcnt);
6535 6535 ppa[pg_idx] = NULL;
6536 6536
6537 6537
6538 6538 /* Find each large page within ppa, and adjust its claim */
6539 6539
6540 6540 /* Does ppa cover a single large page? */
6541 6541 if (ppa[0]->p_szc == seg->s_szc) {
6542 6542 if (prot & PROT_WRITE)
6543 6543 err = page_addclaim_pages(ppa);
6544 6544 else
6545 6545 err = page_subclaim_pages(ppa);
6546 6546 } else {
6547 6547 for (i = 0; ppa[i]; i += pgcnt) {
6548 6548 ASSERT(IS_P2ALIGNED(page_pptonum(ppa[i]), pgcnt));
6549 6549 if (prot & PROT_WRITE)
6550 6550 err = page_addclaim_pages(&ppa[i]);
6551 6551 else
6552 6552 err = page_subclaim_pages(&ppa[i]);
6553 6553 if (err == 0)
6554 6554 break;
6555 6555 }
6556 6556 }
6557 6557
6558 6558 for (i = 0; i < pg_idx; i++) {
6559 6559 ASSERT(ppa[i] != NULL);
6560 6560 page_unlock(ppa[i]);
6561 6561 }
6562 6562
6563 6563 kmem_free(ppa, ppasize);
6564 6564 return (err);
6565 6565 }
6566 6566
6567 6567 /*
6568 6568 * Returns right (upper address) segment if split occurred.
6569 6569 * If the address is equal to the beginning or end of its segment it returns
6570 6570 * the current segment.
6571 6571 */
6572 6572 static struct seg *
6573 6573 segvn_split_seg(struct seg *seg, caddr_t addr)
6574 6574 {
6575 6575 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6576 6576 struct seg *nseg;
6577 6577 size_t nsize;
6578 6578 struct segvn_data *nsvd;
6579 6579
6580 6580 ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
6581 6581 ASSERT(svd->tr_state == SEGVN_TR_OFF);
6582 6582
6583 6583 ASSERT(addr >= seg->s_base);
6584 6584 ASSERT(addr <= seg->s_base + seg->s_size);
6585 6585 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
6586 6586
6587 6587 if (addr == seg->s_base || addr == seg->s_base + seg->s_size)
6588 6588 return (seg);
6589 6589
6590 6590 nsize = seg->s_base + seg->s_size - addr;
6591 6591 seg->s_size = addr - seg->s_base;
6592 6592 nseg = seg_alloc(seg->s_as, addr, nsize);
6593 6593 ASSERT(nseg != NULL);
6594 6594 nseg->s_ops = seg->s_ops;
6595 6595 nsvd = kmem_cache_alloc(segvn_cache, KM_SLEEP);
6596 6596 nseg->s_data = (void *)nsvd;
6597 6597 nseg->s_szc = seg->s_szc;
6598 6598 *nsvd = *svd;
6599 6599 ASSERT(nsvd->rcookie == HAT_INVALID_REGION_COOKIE);
6600 6600 nsvd->seg = nseg;
6601 6601 rw_init(&nsvd->lock, NULL, RW_DEFAULT, NULL);
6602 6602
6603 6603 if (nsvd->vp != NULL) {
6604 6604 VN_HOLD(nsvd->vp);
6605 6605 nsvd->offset = svd->offset +
6606 6606 (uintptr_t)(nseg->s_base - seg->s_base);
6607 6607 if (nsvd->type == MAP_SHARED)
6608 6608 lgrp_shm_policy_init(NULL, nsvd->vp);
6609 6609 } else {
6610 6610 /*
6611 6611 * The offset for an anonymous segment has no signifigance in
6612 6612 * terms of an offset into a file. If we were to use the above
6613 6613 * calculation instead, the structures read out of
6614 6614 * /proc/<pid>/xmap would be more difficult to decipher since
6615 6615 * it would be unclear whether two seemingly contiguous
6616 6616 * prxmap_t structures represented different segments or a
6617 6617 * single segment that had been split up into multiple prxmap_t
6618 6618 * structures (e.g. if some part of the segment had not yet
6619 6619 * been faulted in).
6620 6620 */
6621 6621 nsvd->offset = 0;
6622 6622 }
6623 6623
6624 6624 ASSERT(svd->softlockcnt == 0);
6625 6625 ASSERT(svd->softlockcnt_sbase == 0);
6626 6626 ASSERT(svd->softlockcnt_send == 0);
6627 6627 crhold(svd->cred);
6628 6628
6629 6629 if (svd->vpage != NULL) {
6630 6630 size_t bytes = vpgtob(seg_pages(seg));
6631 6631 size_t nbytes = vpgtob(seg_pages(nseg));
6632 6632 struct vpage *ovpage = svd->vpage;
6633 6633
6634 6634 svd->vpage = kmem_alloc(bytes, KM_SLEEP);
6635 6635 bcopy(ovpage, svd->vpage, bytes);
6636 6636 nsvd->vpage = kmem_alloc(nbytes, KM_SLEEP);
6637 6637 bcopy(ovpage + seg_pages(seg), nsvd->vpage, nbytes);
6638 6638 kmem_free(ovpage, bytes + nbytes);
6639 6639 }
6640 6640 if (svd->amp != NULL && svd->type == MAP_PRIVATE) {
6641 6641 struct anon_map *oamp = svd->amp, *namp;
6642 6642 struct anon_hdr *nahp;
6643 6643
6644 6644 ANON_LOCK_ENTER(&oamp->a_rwlock, RW_WRITER);
6645 6645 ASSERT(oamp->refcnt == 1);
6646 6646 nahp = anon_create(btop(seg->s_size), ANON_SLEEP);
6647 6647 (void) anon_copy_ptr(oamp->ahp, svd->anon_index,
6648 6648 nahp, 0, btop(seg->s_size), ANON_SLEEP);
6649 6649
6650 6650 namp = anonmap_alloc(nseg->s_size, 0, ANON_SLEEP);
6651 6651 namp->a_szc = nseg->s_szc;
6652 6652 (void) anon_copy_ptr(oamp->ahp,
6653 6653 svd->anon_index + btop(seg->s_size),
6654 6654 namp->ahp, 0, btop(nseg->s_size), ANON_SLEEP);
6655 6655 anon_release(oamp->ahp, btop(oamp->size));
6656 6656 oamp->ahp = nahp;
6657 6657 oamp->size = seg->s_size;
6658 6658 svd->anon_index = 0;
6659 6659 nsvd->amp = namp;
6660 6660 nsvd->anon_index = 0;
6661 6661 ANON_LOCK_EXIT(&oamp->a_rwlock);
6662 6662 } else if (svd->amp != NULL) {
6663 6663 pgcnt_t pgcnt = page_get_pagecnt(seg->s_szc);
6664 6664 ASSERT(svd->amp == nsvd->amp);
6665 6665 ASSERT(seg->s_szc <= svd->amp->a_szc);
6666 6666 nsvd->anon_index = svd->anon_index + seg_pages(seg);
6667 6667 ASSERT(IS_P2ALIGNED(nsvd->anon_index, pgcnt));
6668 6668 ANON_LOCK_ENTER(&svd->amp->a_rwlock, RW_WRITER);
6669 6669 svd->amp->refcnt++;
6670 6670 ANON_LOCK_EXIT(&svd->amp->a_rwlock);
6671 6671 }
6672 6672
6673 6673 /*
6674 6674 * Split the amount of swap reserved.
6675 6675 */
6676 6676 if (svd->swresv) {
6677 6677 /*
6678 6678 * For MAP_NORESERVE, only allocate swap reserve for pages
6679 6679 * being used. Other segments get enough to cover whole
6680 6680 * segment.
6681 6681 */
6682 6682 if (svd->flags & MAP_NORESERVE) {
6683 6683 size_t oswresv;
6684 6684
6685 6685 ASSERT(svd->amp);
6686 6686 oswresv = svd->swresv;
6687 6687 svd->swresv = ptob(anon_pages(svd->amp->ahp,
6688 6688 svd->anon_index, btop(seg->s_size)));
6689 6689 nsvd->swresv = ptob(anon_pages(nsvd->amp->ahp,
6690 6690 nsvd->anon_index, btop(nseg->s_size)));
6691 6691 ASSERT(oswresv >= (svd->swresv + nsvd->swresv));
6692 6692 } else {
6693 6693 if (svd->pageswap) {
6694 6694 svd->swresv = segvn_count_swap_by_vpages(seg);
6695 6695 ASSERT(nsvd->swresv >= svd->swresv);
6696 6696 nsvd->swresv -= svd->swresv;
6697 6697 } else {
6698 6698 ASSERT(svd->swresv == seg->s_size +
6699 6699 nseg->s_size);
6700 6700 svd->swresv = seg->s_size;
6701 6701 nsvd->swresv = nseg->s_size;
6702 6702 }
6703 6703 }
6704 6704 }
6705 6705
6706 6706 return (nseg);
6707 6707 }
6708 6708
6709 6709 /*
6710 6710 * called on memory operations (unmap, setprot, setpagesize) for a subset
6711 6711 * of a large page segment to either demote the memory range (SDR_RANGE)
6712 6712 * or the ends (SDR_END) by addr/len.
6713 6713 *
6714 6714 * returns 0 on success. returns errno, including ENOMEM, on failure.
6715 6715 */
6716 6716 static int
6717 6717 segvn_demote_range(
6718 6718 struct seg *seg,
6719 6719 caddr_t addr,
6720 6720 size_t len,
6721 6721 int flag,
6722 6722 uint_t szcvec)
6723 6723 {
6724 6724 caddr_t eaddr = addr + len;
6725 6725 caddr_t lpgaddr, lpgeaddr;
6726 6726 struct seg *nseg;
6727 6727 struct seg *badseg1 = NULL;
6728 6728 struct seg *badseg2 = NULL;
6729 6729 size_t pgsz;
6730 6730 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6731 6731 int err;
6732 6732 uint_t szc = seg->s_szc;
6733 6733 uint_t tszcvec;
6734 6734
6735 6735 ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
6736 6736 ASSERT(svd->tr_state == SEGVN_TR_OFF);
6737 6737 ASSERT(szc != 0);
6738 6738 pgsz = page_get_pagesize(szc);
6739 6739 ASSERT(seg->s_base != addr || seg->s_size != len);
6740 6740 ASSERT(addr >= seg->s_base && eaddr <= seg->s_base + seg->s_size);
6741 6741 ASSERT(svd->softlockcnt == 0);
6742 6742 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
6743 6743 ASSERT(szcvec == 0 || (flag == SDR_END && svd->type == MAP_SHARED));
6744 6744
6745 6745 CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr);
6746 6746 ASSERT(flag == SDR_RANGE || eaddr < lpgeaddr || addr > lpgaddr);
6747 6747 if (flag == SDR_RANGE) {
6748 6748 /* demote entire range */
6749 6749 badseg1 = nseg = segvn_split_seg(seg, lpgaddr);
6750 6750 (void) segvn_split_seg(nseg, lpgeaddr);
6751 6751 ASSERT(badseg1->s_base == lpgaddr);
6752 6752 ASSERT(badseg1->s_size == lpgeaddr - lpgaddr);
6753 6753 } else if (addr != lpgaddr) {
6754 6754 ASSERT(flag == SDR_END);
6755 6755 badseg1 = nseg = segvn_split_seg(seg, lpgaddr);
6756 6756 if (eaddr != lpgeaddr && eaddr > lpgaddr + pgsz &&
6757 6757 eaddr < lpgaddr + 2 * pgsz) {
6758 6758 (void) segvn_split_seg(nseg, lpgeaddr);
6759 6759 ASSERT(badseg1->s_base == lpgaddr);
6760 6760 ASSERT(badseg1->s_size == 2 * pgsz);
6761 6761 } else {
6762 6762 nseg = segvn_split_seg(nseg, lpgaddr + pgsz);
6763 6763 ASSERT(badseg1->s_base == lpgaddr);
6764 6764 ASSERT(badseg1->s_size == pgsz);
6765 6765 if (eaddr != lpgeaddr && eaddr > lpgaddr + pgsz) {
6766 6766 ASSERT(lpgeaddr - lpgaddr > 2 * pgsz);
6767 6767 nseg = segvn_split_seg(nseg, lpgeaddr - pgsz);
6768 6768 badseg2 = nseg;
6769 6769 (void) segvn_split_seg(nseg, lpgeaddr);
6770 6770 ASSERT(badseg2->s_base == lpgeaddr - pgsz);
6771 6771 ASSERT(badseg2->s_size == pgsz);
6772 6772 }
6773 6773 }
6774 6774 } else {
6775 6775 ASSERT(flag == SDR_END);
6776 6776 ASSERT(eaddr < lpgeaddr);
6777 6777 badseg1 = nseg = segvn_split_seg(seg, lpgeaddr - pgsz);
6778 6778 (void) segvn_split_seg(nseg, lpgeaddr);
6779 6779 ASSERT(badseg1->s_base == lpgeaddr - pgsz);
6780 6780 ASSERT(badseg1->s_size == pgsz);
6781 6781 }
6782 6782
6783 6783 ASSERT(badseg1 != NULL);
6784 6784 ASSERT(badseg1->s_szc == szc);
6785 6785 ASSERT(flag == SDR_RANGE || badseg1->s_size == pgsz ||
6786 6786 badseg1->s_size == 2 * pgsz);
6787 6787 ASSERT(sameprot(badseg1, badseg1->s_base, pgsz));
6788 6788 ASSERT(badseg1->s_size == pgsz ||
6789 6789 sameprot(badseg1, badseg1->s_base + pgsz, pgsz));
6790 6790 if (err = segvn_clrszc(badseg1)) {
6791 6791 return (err);
6792 6792 }
6793 6793 ASSERT(badseg1->s_szc == 0);
6794 6794
6795 6795 if (szc > 1 && (tszcvec = P2PHASE(szcvec, 1 << szc)) > 1) {
6796 6796 uint_t tszc = highbit(tszcvec) - 1;
6797 6797 caddr_t ta = MAX(addr, badseg1->s_base);
6798 6798 caddr_t te;
6799 6799 size_t tpgsz = page_get_pagesize(tszc);
6800 6800
6801 6801 ASSERT(svd->type == MAP_SHARED);
6802 6802 ASSERT(flag == SDR_END);
6803 6803 ASSERT(tszc < szc && tszc > 0);
6804 6804
6805 6805 if (eaddr > badseg1->s_base + badseg1->s_size) {
6806 6806 te = badseg1->s_base + badseg1->s_size;
6807 6807 } else {
6808 6808 te = eaddr;
6809 6809 }
6810 6810
6811 6811 ASSERT(ta <= te);
6812 6812 badseg1->s_szc = tszc;
6813 6813 if (!IS_P2ALIGNED(ta, tpgsz) || !IS_P2ALIGNED(te, tpgsz)) {
6814 6814 if (badseg2 != NULL) {
6815 6815 err = segvn_demote_range(badseg1, ta, te - ta,
6816 6816 SDR_END, tszcvec);
6817 6817 if (err != 0) {
6818 6818 return (err);
6819 6819 }
6820 6820 } else {
6821 6821 return (segvn_demote_range(badseg1, ta,
6822 6822 te - ta, SDR_END, tszcvec));
6823 6823 }
6824 6824 }
6825 6825 }
6826 6826
6827 6827 if (badseg2 == NULL)
6828 6828 return (0);
6829 6829 ASSERT(badseg2->s_szc == szc);
6830 6830 ASSERT(badseg2->s_size == pgsz);
6831 6831 ASSERT(sameprot(badseg2, badseg2->s_base, badseg2->s_size));
6832 6832 if (err = segvn_clrszc(badseg2)) {
6833 6833 return (err);
6834 6834 }
6835 6835 ASSERT(badseg2->s_szc == 0);
6836 6836
6837 6837 if (szc > 1 && (tszcvec = P2PHASE(szcvec, 1 << szc)) > 1) {
6838 6838 uint_t tszc = highbit(tszcvec) - 1;
6839 6839 size_t tpgsz = page_get_pagesize(tszc);
6840 6840
6841 6841 ASSERT(svd->type == MAP_SHARED);
6842 6842 ASSERT(flag == SDR_END);
6843 6843 ASSERT(tszc < szc && tszc > 0);
6844 6844 ASSERT(badseg2->s_base > addr);
6845 6845 ASSERT(eaddr > badseg2->s_base);
6846 6846 ASSERT(eaddr < badseg2->s_base + badseg2->s_size);
6847 6847
6848 6848 badseg2->s_szc = tszc;
6849 6849 if (!IS_P2ALIGNED(eaddr, tpgsz)) {
6850 6850 return (segvn_demote_range(badseg2, badseg2->s_base,
6851 6851 eaddr - badseg2->s_base, SDR_END, tszcvec));
6852 6852 }
6853 6853 }
6854 6854
6855 6855 return (0);
6856 6856 }
6857 6857
6858 6858 static int
6859 6859 segvn_checkprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot)
6860 6860 {
6861 6861 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6862 6862 struct vpage *vp, *evp;
6863 6863
6864 6864 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
6865 6865
6866 6866 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
6867 6867 /*
6868 6868 * If segment protection can be used, simply check against them.
6869 6869 */
6870 6870 if (svd->pageprot == 0) {
6871 6871 int err;
6872 6872
6873 6873 err = ((svd->prot & prot) != prot) ? EACCES : 0;
6874 6874 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
6875 6875 return (err);
6876 6876 }
6877 6877
6878 6878 /*
6879 6879 * Have to check down to the vpage level.
6880 6880 */
6881 6881 evp = &svd->vpage[seg_page(seg, addr + len)];
6882 6882 for (vp = &svd->vpage[seg_page(seg, addr)]; vp < evp; vp++) {
6883 6883 if ((VPP_PROT(vp) & prot) != prot) {
6884 6884 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
6885 6885 return (EACCES);
6886 6886 }
6887 6887 }
6888 6888 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
6889 6889 return (0);
6890 6890 }
6891 6891
6892 6892 static int
6893 6893 segvn_getprot(struct seg *seg, caddr_t addr, size_t len, uint_t *protv)
6894 6894 {
6895 6895 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6896 6896 size_t pgno = seg_page(seg, addr + len) - seg_page(seg, addr) + 1;
6897 6897
6898 6898 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
6899 6899
6900 6900 if (pgno != 0) {
6901 6901 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
6902 6902 if (svd->pageprot == 0) {
6903 6903 do {
6904 6904 protv[--pgno] = svd->prot;
6905 6905 } while (pgno != 0);
6906 6906 } else {
6907 6907 size_t pgoff = seg_page(seg, addr);
6908 6908
6909 6909 do {
6910 6910 pgno--;
6911 6911 protv[pgno] = VPP_PROT(&svd->vpage[pgno+pgoff]);
6912 6912 } while (pgno != 0);
6913 6913 }
6914 6914 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
6915 6915 }
6916 6916 return (0);
6917 6917 }
6918 6918
6919 6919 static u_offset_t
6920 6920 segvn_getoffset(struct seg *seg, caddr_t addr)
6921 6921 {
6922 6922 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6923 6923
6924 6924 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
6925 6925
6926 6926 return (svd->offset + (uintptr_t)(addr - seg->s_base));
6927 6927 }
6928 6928
6929 6929 /*ARGSUSED*/
6930 6930 static int
6931 6931 segvn_gettype(struct seg *seg, caddr_t addr)
6932 6932 {
6933 6933 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6934 6934
6935 6935 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
6936 6936
6937 6937 return (svd->type | (svd->flags & (MAP_NORESERVE | MAP_TEXT |
6938 6938 MAP_INITDATA)));
6939 6939 }
6940 6940
6941 6941 /*ARGSUSED*/
6942 6942 static int
6943 6943 segvn_getvp(struct seg *seg, caddr_t addr, struct vnode **vpp)
6944 6944 {
6945 6945 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6946 6946
6947 6947 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
6948 6948
6949 6949 *vpp = svd->vp;
6950 6950 return (0);
6951 6951 }
6952 6952
6953 6953 /*
6954 6954 * Check to see if it makes sense to do kluster/read ahead to
6955 6955 * addr + delta relative to the mapping at addr. We assume here
6956 6956 * that delta is a signed PAGESIZE'd multiple (which can be negative).
6957 6957 *
6958 6958 * For segvn, we currently "approve" of the action if we are
6959 6959 * still in the segment and it maps from the same vp/off,
6960 6960 * or if the advice stored in segvn_data or vpages allows it.
6961 6961 * Currently, klustering is not allowed only if MADV_RANDOM is set.
6962 6962 */
6963 6963 static int
6964 6964 segvn_kluster(struct seg *seg, caddr_t addr, ssize_t delta)
6965 6965 {
6966 6966 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
6967 6967 struct anon *oap, *ap;
6968 6968 ssize_t pd;
6969 6969 size_t page;
6970 6970 struct vnode *vp1, *vp2;
6971 6971 u_offset_t off1, off2;
6972 6972 struct anon_map *amp;
6973 6973
6974 6974 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
6975 6975 ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock) ||
6976 6976 SEGVN_LOCK_HELD(seg->s_as, &svd->lock));
6977 6977
6978 6978 if (addr + delta < seg->s_base ||
6979 6979 addr + delta >= (seg->s_base + seg->s_size))
6980 6980 return (-1); /* exceeded segment bounds */
6981 6981
6982 6982 pd = delta / (ssize_t)PAGESIZE; /* divide to preserve sign bit */
6983 6983 page = seg_page(seg, addr);
6984 6984
6985 6985 /*
6986 6986 * Check to see if either of the pages addr or addr + delta
6987 6987 * have advice set that prevents klustering (if MADV_RANDOM advice
6988 6988 * is set for entire segment, or MADV_SEQUENTIAL is set and delta
6989 6989 * is negative).
6990 6990 */
6991 6991 if (svd->advice == MADV_RANDOM ||
6992 6992 svd->advice == MADV_SEQUENTIAL && delta < 0)
6993 6993 return (-1);
6994 6994 else if (svd->pageadvice && svd->vpage) {
6995 6995 struct vpage *bvpp, *evpp;
6996 6996
6997 6997 bvpp = &svd->vpage[page];
6998 6998 evpp = &svd->vpage[page + pd];
6999 6999 if (VPP_ADVICE(bvpp) == MADV_RANDOM ||
7000 7000 VPP_ADVICE(evpp) == MADV_SEQUENTIAL && delta < 0)
7001 7001 return (-1);
7002 7002 if (VPP_ADVICE(bvpp) != VPP_ADVICE(evpp) &&
7003 7003 VPP_ADVICE(evpp) == MADV_RANDOM)
7004 7004 return (-1);
7005 7005 }
7006 7006
7007 7007 if (svd->type == MAP_SHARED)
7008 7008 return (0); /* shared mapping - all ok */
7009 7009
7010 7010 if ((amp = svd->amp) == NULL)
7011 7011 return (0); /* off original vnode */
7012 7012
7013 7013 page += svd->anon_index;
7014 7014
7015 7015 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
7016 7016
7017 7017 oap = anon_get_ptr(amp->ahp, page);
7018 7018 ap = anon_get_ptr(amp->ahp, page + pd);
7019 7019
7020 7020 ANON_LOCK_EXIT(&->a_rwlock);
7021 7021
7022 7022 if ((oap == NULL && ap != NULL) || (oap != NULL && ap == NULL)) {
7023 7023 return (-1); /* one with and one without an anon */
7024 7024 }
7025 7025
7026 7026 if (oap == NULL) { /* implies that ap == NULL */
7027 7027 return (0); /* off original vnode */
7028 7028 }
7029 7029
7030 7030 /*
7031 7031 * Now we know we have two anon pointers - check to
7032 7032 * see if they happen to be properly allocated.
7033 7033 */
7034 7034
7035 7035 /*
7036 7036 * XXX We cheat here and don't lock the anon slots. We can't because
7037 7037 * we may have been called from the anon layer which might already
7038 7038 * have locked them. We are holding a refcnt on the slots so they
7039 7039 * can't disappear. The worst that will happen is we'll get the wrong
7040 7040 * names (vp, off) for the slots and make a poor klustering decision.
7041 7041 */
7042 7042 swap_xlate(ap, &vp1, &off1);
7043 7043 swap_xlate(oap, &vp2, &off2);
7044 7044
7045 7045
7046 7046 if (!VOP_CMP(vp1, vp2, NULL) || off1 - off2 != delta)
7047 7047 return (-1);
7048 7048 return (0);
7049 7049 }
7050 7050
7051 7051 /*
7052 7052 * Synchronize primary storage cache with real object in virtual memory.
7053 7053 *
7054 7054 * XXX - Anonymous pages should not be sync'ed out at all.
7055 7055 */
7056 7056 static int
7057 7057 segvn_sync(struct seg *seg, caddr_t addr, size_t len, int attr, uint_t flags)
7058 7058 {
7059 7059 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
7060 7060 struct vpage *vpp;
7061 7061 page_t *pp;
7062 7062 u_offset_t offset;
7063 7063 struct vnode *vp;
7064 7064 u_offset_t off;
7065 7065 caddr_t eaddr;
7066 7066 int bflags;
7067 7067 int err = 0;
7068 7068 int segtype;
7069 7069 int pageprot;
7070 7070 int prot;
7071 7071 ulong_t anon_index;
7072 7072 struct anon_map *amp;
7073 7073 struct anon *ap;
7074 7074 anon_sync_obj_t cookie;
7075 7075
7076 7076 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
7077 7077
7078 7078 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
7079 7079
7080 7080 if (svd->softlockcnt > 0) {
7081 7081 /*
7082 7082 * If this is shared segment non 0 softlockcnt
7083 7083 * means locked pages are still in use.
7084 7084 */
7085 7085 if (svd->type == MAP_SHARED) {
7086 7086 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7087 7087 return (EAGAIN);
7088 7088 }
7089 7089
7090 7090 /*
7091 7091 * flush all pages from seg cache
7092 7092 * otherwise we may deadlock in swap_putpage
7093 7093 * for B_INVAL page (4175402).
7094 7094 *
7095 7095 * Even if we grab segvn WRITER's lock
7096 7096 * here, there might be another thread which could've
7097 7097 * successfully performed lookup/insert just before
7098 7098 * we acquired the lock here. So, grabbing either
7099 7099 * lock here is of not much use. Until we devise
7100 7100 * a strategy at upper layers to solve the
7101 7101 * synchronization issues completely, we expect
7102 7102 * applications to handle this appropriately.
7103 7103 */
7104 7104 segvn_purge(seg);
7105 7105 if (svd->softlockcnt > 0) {
7106 7106 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7107 7107 return (EAGAIN);
7108 7108 }
7109 7109 } else if (svd->type == MAP_SHARED && svd->amp != NULL &&
7110 7110 svd->amp->a_softlockcnt > 0) {
7111 7111 /*
7112 7112 * Try to purge this amp's entries from pcache. It will
7113 7113 * succeed only if other segments that share the amp have no
7114 7114 * outstanding softlock's.
7115 7115 */
7116 7116 segvn_purge(seg);
7117 7117 if (svd->amp->a_softlockcnt > 0 || svd->softlockcnt > 0) {
7118 7118 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7119 7119 return (EAGAIN);
7120 7120 }
7121 7121 }
7122 7122
7123 7123 vpp = svd->vpage;
7124 7124 offset = svd->offset + (uintptr_t)(addr - seg->s_base);
7125 7125 bflags = ((flags & MS_ASYNC) ? B_ASYNC : 0) |
7126 7126 ((flags & MS_INVALIDATE) ? B_INVAL : 0);
7127 7127
7128 7128 if (attr) {
7129 7129 pageprot = attr & ~(SHARED|PRIVATE);
7130 7130 segtype = (attr & SHARED) ? MAP_SHARED : MAP_PRIVATE;
7131 7131
7132 7132 /*
7133 7133 * We are done if the segment types don't match
7134 7134 * or if we have segment level protections and
7135 7135 * they don't match.
7136 7136 */
7137 7137 if (svd->type != segtype) {
7138 7138 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7139 7139 return (0);
7140 7140 }
7141 7141 if (vpp == NULL) {
7142 7142 if (svd->prot != pageprot) {
7143 7143 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7144 7144 return (0);
7145 7145 }
7146 7146 prot = svd->prot;
7147 7147 } else
7148 7148 vpp = &svd->vpage[seg_page(seg, addr)];
7149 7149
7150 7150 } else if (svd->vp && svd->amp == NULL &&
7151 7151 (flags & MS_INVALIDATE) == 0) {
7152 7152
7153 7153 /*
7154 7154 * No attributes, no anonymous pages and MS_INVALIDATE flag
7155 7155 * is not on, just use one big request.
7156 7156 */
7157 7157 err = VOP_PUTPAGE(svd->vp, (offset_t)offset, len,
7158 7158 bflags, svd->cred, NULL);
7159 7159 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7160 7160 return (err);
7161 7161 }
7162 7162
7163 7163 if ((amp = svd->amp) != NULL)
7164 7164 anon_index = svd->anon_index + seg_page(seg, addr);
7165 7165
7166 7166 for (eaddr = addr + len; addr < eaddr; addr += PAGESIZE) {
7167 7167 ap = NULL;
7168 7168 if (amp != NULL) {
7169 7169 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
7170 7170 anon_array_enter(amp, anon_index, &cookie);
7171 7171 ap = anon_get_ptr(amp->ahp, anon_index++);
7172 7172 if (ap != NULL) {
7173 7173 swap_xlate(ap, &vp, &off);
7174 7174 } else {
7175 7175 vp = svd->vp;
7176 7176 off = offset;
7177 7177 }
7178 7178 anon_array_exit(&cookie);
7179 7179 ANON_LOCK_EXIT(&->a_rwlock);
7180 7180 } else {
7181 7181 vp = svd->vp;
7182 7182 off = offset;
7183 7183 }
7184 7184 offset += PAGESIZE;
7185 7185
7186 7186 if (vp == NULL) /* untouched zfod page */
7187 7187 continue;
7188 7188
7189 7189 if (attr) {
7190 7190 if (vpp) {
7191 7191 prot = VPP_PROT(vpp);
7192 7192 vpp++;
7193 7193 }
7194 7194 if (prot != pageprot) {
7195 7195 continue;
7196 7196 }
7197 7197 }
7198 7198
7199 7199 /*
7200 7200 * See if any of these pages are locked -- if so, then we
7201 7201 * will have to truncate an invalidate request at the first
7202 7202 * locked one. We don't need the page_struct_lock to test
7203 7203 * as this is only advisory; even if we acquire it someone
7204 7204 * might race in and lock the page after we unlock and before
7205 7205 * we do the PUTPAGE, then PUTPAGE simply does nothing.
7206 7206 */
7207 7207 if (flags & MS_INVALIDATE) {
7208 7208 if ((pp = page_lookup(vp, off, SE_SHARED)) != NULL) {
7209 7209 if (pp->p_lckcnt != 0 || pp->p_cowcnt != 0) {
7210 7210 page_unlock(pp);
7211 7211 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7212 7212 return (EBUSY);
7213 7213 }
7214 7214 if (ap != NULL && pp->p_szc != 0 &&
7215 7215 page_tryupgrade(pp)) {
7216 7216 if (pp->p_lckcnt == 0 &&
7217 7217 pp->p_cowcnt == 0) {
7218 7218 /*
7219 7219 * swapfs VN_DISPOSE() won't
7220 7220 * invalidate large pages.
7221 7221 * Attempt to demote.
7222 7222 * XXX can't help it if it
7223 7223 * fails. But for swapfs
7224 7224 * pages it is no big deal.
7225 7225 */
7226 7226 (void) page_try_demote_pages(
7227 7227 pp);
7228 7228 }
7229 7229 }
7230 7230 page_unlock(pp);
7231 7231 }
7232 7232 } else if (svd->type == MAP_SHARED && amp != NULL) {
7233 7233 /*
7234 7234 * Avoid writing out to disk ISM's large pages
7235 7235 * because segspt_free_pages() relies on NULL an_pvp
7236 7236 * of anon slots of such pages.
7237 7237 */
7238 7238
7239 7239 ASSERT(svd->vp == NULL);
7240 7240 /*
7241 7241 * swapfs uses page_lookup_nowait if not freeing or
7242 7242 * invalidating and skips a page if
7243 7243 * page_lookup_nowait returns NULL.
7244 7244 */
7245 7245 pp = page_lookup_nowait(vp, off, SE_SHARED);
7246 7246 if (pp == NULL) {
7247 7247 continue;
7248 7248 }
7249 7249 if (pp->p_szc != 0) {
7250 7250 page_unlock(pp);
7251 7251 continue;
7252 7252 }
7253 7253
7254 7254 /*
7255 7255 * Note ISM pages are created large so (vp, off)'s
7256 7256 * page cannot suddenly become large after we unlock
7257 7257 * pp.
7258 7258 */
7259 7259 page_unlock(pp);
7260 7260 }
7261 7261 /*
7262 7262 * XXX - Should ultimately try to kluster
7263 7263 * calls to VOP_PUTPAGE() for performance.
7264 7264 */
7265 7265 VN_HOLD(vp);
7266 7266 err = VOP_PUTPAGE(vp, (offset_t)off, PAGESIZE,
7267 7267 (bflags | (IS_SWAPFSVP(vp) ? B_PAGE_NOWAIT : 0)),
7268 7268 svd->cred, NULL);
7269 7269
7270 7270 VN_RELE(vp);
7271 7271 if (err)
7272 7272 break;
7273 7273 }
7274 7274 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7275 7275 return (err);
7276 7276 }
7277 7277
7278 7278 /*
7279 7279 * Determine if we have data corresponding to pages in the
7280 7280 * primary storage virtual memory cache (i.e., "in core").
7281 7281 */
7282 7282 static size_t
7283 7283 segvn_incore(struct seg *seg, caddr_t addr, size_t len, char *vec)
7284 7284 {
7285 7285 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
7286 7286 struct vnode *vp, *avp;
7287 7287 u_offset_t offset, aoffset;
7288 7288 size_t p, ep;
7289 7289 int ret;
7290 7290 struct vpage *vpp;
7291 7291 page_t *pp;
7292 7292 uint_t start;
7293 7293 struct anon_map *amp; /* XXX - for locknest */
7294 7294 struct anon *ap;
7295 7295 uint_t attr;
7296 7296 anon_sync_obj_t cookie;
7297 7297
7298 7298 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
7299 7299
7300 7300 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
7301 7301 if (svd->amp == NULL && svd->vp == NULL) {
7302 7302 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7303 7303 bzero(vec, btopr(len));
7304 7304 return (len); /* no anonymous pages created yet */
7305 7305 }
7306 7306
7307 7307 p = seg_page(seg, addr);
7308 7308 ep = seg_page(seg, addr + len);
7309 7309 start = svd->vp ? SEG_PAGE_VNODEBACKED : 0;
7310 7310
7311 7311 amp = svd->amp;
7312 7312 for (; p < ep; p++, addr += PAGESIZE) {
7313 7313 vpp = (svd->vpage) ? &svd->vpage[p]: NULL;
7314 7314 ret = start;
7315 7315 ap = NULL;
7316 7316 avp = NULL;
7317 7317 /* Grab the vnode/offset for the anon slot */
7318 7318 if (amp != NULL) {
7319 7319 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
7320 7320 anon_array_enter(amp, svd->anon_index + p, &cookie);
7321 7321 ap = anon_get_ptr(amp->ahp, svd->anon_index + p);
7322 7322 if (ap != NULL) {
7323 7323 swap_xlate(ap, &avp, &aoffset);
7324 7324 }
7325 7325 anon_array_exit(&cookie);
7326 7326 ANON_LOCK_EXIT(&->a_rwlock);
7327 7327 }
7328 7328 if ((avp != NULL) && page_exists(avp, aoffset)) {
7329 7329 /* A page exists for the anon slot */
7330 7330 ret |= SEG_PAGE_INCORE;
7331 7331
7332 7332 /*
7333 7333 * If page is mapped and writable
7334 7334 */
7335 7335 attr = (uint_t)0;
7336 7336 if ((hat_getattr(seg->s_as->a_hat, addr,
7337 7337 &attr) != -1) && (attr & PROT_WRITE)) {
7338 7338 ret |= SEG_PAGE_ANON;
7339 7339 }
7340 7340 /*
7341 7341 * Don't get page_struct lock for lckcnt and cowcnt,
7342 7342 * since this is purely advisory.
7343 7343 */
7344 7344 if ((pp = page_lookup_nowait(avp, aoffset,
7345 7345 SE_SHARED)) != NULL) {
7346 7346 if (pp->p_lckcnt)
7347 7347 ret |= SEG_PAGE_SOFTLOCK;
7348 7348 if (pp->p_cowcnt)
7349 7349 ret |= SEG_PAGE_HASCOW;
7350 7350 page_unlock(pp);
7351 7351 }
7352 7352 }
7353 7353
7354 7354 /* Gather vnode statistics */
7355 7355 vp = svd->vp;
7356 7356 offset = svd->offset + (uintptr_t)(addr - seg->s_base);
7357 7357
7358 7358 if (vp != NULL) {
7359 7359 /*
7360 7360 * Try to obtain a "shared" lock on the page
7361 7361 * without blocking. If this fails, determine
7362 7362 * if the page is in memory.
7363 7363 */
7364 7364 pp = page_lookup_nowait(vp, offset, SE_SHARED);
7365 7365 if ((pp == NULL) && (page_exists(vp, offset))) {
7366 7366 /* Page is incore, and is named */
7367 7367 ret |= (SEG_PAGE_INCORE | SEG_PAGE_VNODE);
7368 7368 }
7369 7369 /*
7370 7370 * Don't get page_struct lock for lckcnt and cowcnt,
7371 7371 * since this is purely advisory.
7372 7372 */
7373 7373 if (pp != NULL) {
7374 7374 ret |= (SEG_PAGE_INCORE | SEG_PAGE_VNODE);
7375 7375 if (pp->p_lckcnt)
7376 7376 ret |= SEG_PAGE_SOFTLOCK;
7377 7377 if (pp->p_cowcnt)
7378 7378 ret |= SEG_PAGE_HASCOW;
7379 7379 page_unlock(pp);
7380 7380 }
7381 7381 }
7382 7382
7383 7383 /* Gather virtual page information */
7384 7384 if (vpp) {
7385 7385 if (VPP_ISPPLOCK(vpp))
7386 7386 ret |= SEG_PAGE_LOCKED;
7387 7387 vpp++;
7388 7388 }
7389 7389
7390 7390 *vec++ = (char)ret;
7391 7391 }
7392 7392 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7393 7393 return (len);
7394 7394 }
7395 7395
7396 7396 /*
7397 7397 * Statement for p_cowcnts/p_lckcnts.
7398 7398 *
7399 7399 * p_cowcnt is updated while mlock/munlocking MAP_PRIVATE and PROT_WRITE region
7400 7400 * irrespective of the following factors or anything else:
7401 7401 *
7402 7402 * (1) anon slots are populated or not
7403 7403 * (2) cow is broken or not
7404 7404 * (3) refcnt on ap is 1 or greater than 1
7405 7405 *
7406 7406 * If it's not MAP_PRIVATE and PROT_WRITE, p_lckcnt is updated during mlock
7407 7407 * and munlock.
7408 7408 *
7409 7409 *
7410 7410 * Handling p_cowcnts/p_lckcnts during copy-on-write fault:
7411 7411 *
7412 7412 * if vpage has PROT_WRITE
7413 7413 * transfer cowcnt on the oldpage -> cowcnt on the newpage
7414 7414 * else
7415 7415 * transfer lckcnt on the oldpage -> lckcnt on the newpage
7416 7416 *
7417 7417 * During copy-on-write, decrement p_cowcnt on the oldpage and increment
7418 7418 * p_cowcnt on the newpage *if* the corresponding vpage has PROT_WRITE.
7419 7419 *
7420 7420 * We may also break COW if softlocking on read access in the physio case.
7421 7421 * In this case, vpage may not have PROT_WRITE. So, we need to decrement
7422 7422 * p_lckcnt on the oldpage and increment p_lckcnt on the newpage *if* the
7423 7423 * vpage doesn't have PROT_WRITE.
7424 7424 *
7425 7425 *
7426 7426 * Handling p_cowcnts/p_lckcnts during mprotect on mlocked region:
7427 7427 *
7428 7428 * If a MAP_PRIVATE region loses PROT_WRITE, we decrement p_cowcnt and
7429 7429 * increment p_lckcnt by calling page_subclaim() which takes care of
7430 7430 * availrmem accounting and p_lckcnt overflow.
7431 7431 *
7432 7432 * If a MAP_PRIVATE region gains PROT_WRITE, we decrement p_lckcnt and
7433 7433 * increment p_cowcnt by calling page_addclaim() which takes care of
7434 7434 * availrmem availability and p_cowcnt overflow.
7435 7435 */
7436 7436
7437 7437 /*
7438 7438 * Lock down (or unlock) pages mapped by this segment.
7439 7439 *
7440 7440 * XXX only creates PAGESIZE pages if anon slots are not initialized.
7441 7441 * At fault time they will be relocated into larger pages.
7442 7442 */
7443 7443 static int
7444 7444 segvn_lockop(struct seg *seg, caddr_t addr, size_t len,
7445 7445 int attr, int op, ulong_t *lockmap, size_t pos)
7446 7446 {
7447 7447 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
7448 7448 struct vpage *vpp;
7449 7449 struct vpage *evp;
7450 7450 page_t *pp;
7451 7451 u_offset_t offset;
7452 7452 u_offset_t off;
7453 7453 int segtype;
7454 7454 int pageprot;
7455 7455 int claim;
7456 7456 struct vnode *vp;
7457 7457 ulong_t anon_index;
7458 7458 struct anon_map *amp;
7459 7459 struct anon *ap;
7460 7460 struct vattr va;
7461 7461 anon_sync_obj_t cookie;
7462 7462 struct kshmid *sp = NULL;
7463 7463 struct proc *p = curproc;
7464 7464 kproject_t *proj = NULL;
7465 7465 int chargeproc = 1;
7466 7466 size_t locked_bytes = 0;
7467 7467 size_t unlocked_bytes = 0;
7468 7468 int err = 0;
7469 7469
7470 7470 /*
7471 7471 * Hold write lock on address space because may split or concatenate
7472 7472 * segments
7473 7473 */
7474 7474 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
7475 7475
7476 7476 /*
7477 7477 * If this is a shm, use shm's project and zone, else use
7478 7478 * project and zone of calling process
7479 7479 */
7480 7480
7481 7481 /* Determine if this segment backs a sysV shm */
7482 7482 if (svd->amp != NULL && svd->amp->a_sp != NULL) {
7483 7483 ASSERT(svd->type == MAP_SHARED);
7484 7484 ASSERT(svd->tr_state == SEGVN_TR_OFF);
7485 7485 sp = svd->amp->a_sp;
7486 7486 proj = sp->shm_perm.ipc_proj;
7487 7487 chargeproc = 0;
7488 7488 }
7489 7489
7490 7490 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
7491 7491 if (attr) {
7492 7492 pageprot = attr & ~(SHARED|PRIVATE);
7493 7493 segtype = attr & SHARED ? MAP_SHARED : MAP_PRIVATE;
7494 7494
7495 7495 /*
7496 7496 * We are done if the segment types don't match
7497 7497 * or if we have segment level protections and
7498 7498 * they don't match.
7499 7499 */
7500 7500 if (svd->type != segtype) {
7501 7501 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7502 7502 return (0);
7503 7503 }
7504 7504 if (svd->pageprot == 0 && svd->prot != pageprot) {
7505 7505 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7506 7506 return (0);
7507 7507 }
7508 7508 }
7509 7509
7510 7510 if (op == MC_LOCK) {
7511 7511 if (svd->tr_state == SEGVN_TR_INIT) {
7512 7512 svd->tr_state = SEGVN_TR_OFF;
7513 7513 } else if (svd->tr_state == SEGVN_TR_ON) {
7514 7514 ASSERT(svd->amp != NULL);
7515 7515 segvn_textunrepl(seg, 0);
7516 7516 ASSERT(svd->amp == NULL &&
7517 7517 svd->tr_state == SEGVN_TR_OFF);
7518 7518 }
7519 7519 }
7520 7520
7521 7521 /*
7522 7522 * If we're locking, then we must create a vpage structure if
7523 7523 * none exists. If we're unlocking, then check to see if there
7524 7524 * is a vpage -- if not, then we could not have locked anything.
7525 7525 */
7526 7526
7527 7527 if ((vpp = svd->vpage) == NULL) {
7528 7528 if (op == MC_LOCK) {
7529 7529 segvn_vpage(seg);
7530 7530 if (svd->vpage == NULL) {
7531 7531 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7532 7532 return (ENOMEM);
7533 7533 }
7534 7534 } else {
7535 7535 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7536 7536 return (0);
7537 7537 }
7538 7538 }
7539 7539
7540 7540 /*
7541 7541 * The anonymous data vector (i.e., previously
7542 7542 * unreferenced mapping to swap space) can be allocated
7543 7543 * by lazily testing for its existence.
7544 7544 */
7545 7545 if (op == MC_LOCK && svd->amp == NULL && svd->vp == NULL) {
7546 7546 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
7547 7547 svd->amp = anonmap_alloc(seg->s_size, 0, ANON_SLEEP);
7548 7548 svd->amp->a_szc = seg->s_szc;
7549 7549 }
7550 7550
7551 7551 if ((amp = svd->amp) != NULL) {
7552 7552 anon_index = svd->anon_index + seg_page(seg, addr);
7553 7553 }
7554 7554
7555 7555 offset = svd->offset + (uintptr_t)(addr - seg->s_base);
7556 7556 evp = &svd->vpage[seg_page(seg, addr + len)];
7557 7557
7558 7558 if (sp != NULL)
7559 7559 mutex_enter(&sp->shm_mlock);
7560 7560
7561 7561 /* determine number of unlocked bytes in range for lock operation */
7562 7562 if (op == MC_LOCK) {
7563 7563
7564 7564 if (sp == NULL) {
7565 7565 for (vpp = &svd->vpage[seg_page(seg, addr)]; vpp < evp;
7566 7566 vpp++) {
7567 7567 if (!VPP_ISPPLOCK(vpp))
7568 7568 unlocked_bytes += PAGESIZE;
7569 7569 }
7570 7570 } else {
7571 7571 ulong_t i_idx, i_edx;
7572 7572 anon_sync_obj_t i_cookie;
7573 7573 struct anon *i_ap;
7574 7574 struct vnode *i_vp;
7575 7575 u_offset_t i_off;
7576 7576
7577 7577 /* Only count sysV pages once for locked memory */
7578 7578 i_edx = svd->anon_index + seg_page(seg, addr + len);
7579 7579 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
7580 7580 for (i_idx = anon_index; i_idx < i_edx; i_idx++) {
7581 7581 anon_array_enter(amp, i_idx, &i_cookie);
7582 7582 i_ap = anon_get_ptr(amp->ahp, i_idx);
7583 7583 if (i_ap == NULL) {
7584 7584 unlocked_bytes += PAGESIZE;
7585 7585 anon_array_exit(&i_cookie);
7586 7586 continue;
7587 7587 }
7588 7588 swap_xlate(i_ap, &i_vp, &i_off);
7589 7589 anon_array_exit(&i_cookie);
7590 7590 pp = page_lookup(i_vp, i_off, SE_SHARED);
7591 7591 if (pp == NULL) {
7592 7592 unlocked_bytes += PAGESIZE;
7593 7593 continue;
7594 7594 } else if (pp->p_lckcnt == 0)
7595 7595 unlocked_bytes += PAGESIZE;
7596 7596 page_unlock(pp);
7597 7597 }
7598 7598 ANON_LOCK_EXIT(&->a_rwlock);
7599 7599 }
7600 7600
7601 7601 mutex_enter(&p->p_lock);
7602 7602 err = rctl_incr_locked_mem(p, proj, unlocked_bytes,
7603 7603 chargeproc);
7604 7604 mutex_exit(&p->p_lock);
7605 7605
7606 7606 if (err) {
7607 7607 if (sp != NULL)
7608 7608 mutex_exit(&sp->shm_mlock);
7609 7609 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7610 7610 return (err);
7611 7611 }
7612 7612 }
7613 7613 /*
7614 7614 * Loop over all pages in the range. Process if we're locking and
7615 7615 * page has not already been locked in this mapping; or if we're
7616 7616 * unlocking and the page has been locked.
7617 7617 */
7618 7618 for (vpp = &svd->vpage[seg_page(seg, addr)]; vpp < evp;
7619 7619 vpp++, pos++, addr += PAGESIZE, offset += PAGESIZE, anon_index++) {
7620 7620 if ((attr == 0 || VPP_PROT(vpp) == pageprot) &&
7621 7621 ((op == MC_LOCK && !VPP_ISPPLOCK(vpp)) ||
7622 7622 (op == MC_UNLOCK && VPP_ISPPLOCK(vpp)))) {
7623 7623
7624 7624 if (amp != NULL)
7625 7625 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
7626 7626 /*
7627 7627 * If this isn't a MAP_NORESERVE segment and
7628 7628 * we're locking, allocate anon slots if they
7629 7629 * don't exist. The page is brought in later on.
7630 7630 */
7631 7631 if (op == MC_LOCK && svd->vp == NULL &&
7632 7632 ((svd->flags & MAP_NORESERVE) == 0) &&
7633 7633 amp != NULL &&
7634 7634 ((ap = anon_get_ptr(amp->ahp, anon_index))
7635 7635 == NULL)) {
7636 7636 anon_array_enter(amp, anon_index, &cookie);
7637 7637
7638 7638 if ((ap = anon_get_ptr(amp->ahp,
7639 7639 anon_index)) == NULL) {
7640 7640 pp = anon_zero(seg, addr, &ap,
7641 7641 svd->cred);
7642 7642 if (pp == NULL) {
7643 7643 anon_array_exit(&cookie);
7644 7644 ANON_LOCK_EXIT(&->a_rwlock);
7645 7645 err = ENOMEM;
7646 7646 goto out;
7647 7647 }
7648 7648 ASSERT(anon_get_ptr(amp->ahp,
7649 7649 anon_index) == NULL);
7650 7650 (void) anon_set_ptr(amp->ahp,
7651 7651 anon_index, ap, ANON_SLEEP);
7652 7652 page_unlock(pp);
7653 7653 }
7654 7654 anon_array_exit(&cookie);
7655 7655 }
7656 7656
7657 7657 /*
7658 7658 * Get name for page, accounting for
7659 7659 * existence of private copy.
7660 7660 */
7661 7661 ap = NULL;
7662 7662 if (amp != NULL) {
7663 7663 anon_array_enter(amp, anon_index, &cookie);
7664 7664 ap = anon_get_ptr(amp->ahp, anon_index);
7665 7665 if (ap != NULL) {
7666 7666 swap_xlate(ap, &vp, &off);
7667 7667 } else {
7668 7668 if (svd->vp == NULL &&
7669 7669 (svd->flags & MAP_NORESERVE)) {
7670 7670 anon_array_exit(&cookie);
7671 7671 ANON_LOCK_EXIT(&->a_rwlock);
7672 7672 continue;
7673 7673 }
7674 7674 vp = svd->vp;
7675 7675 off = offset;
7676 7676 }
7677 7677 if (op != MC_LOCK || ap == NULL) {
7678 7678 anon_array_exit(&cookie);
7679 7679 ANON_LOCK_EXIT(&->a_rwlock);
7680 7680 }
7681 7681 } else {
7682 7682 vp = svd->vp;
7683 7683 off = offset;
7684 7684 }
7685 7685
7686 7686 /*
7687 7687 * Get page frame. It's ok if the page is
7688 7688 * not available when we're unlocking, as this
7689 7689 * may simply mean that a page we locked got
7690 7690 * truncated out of existence after we locked it.
7691 7691 *
7692 7692 * Invoke VOP_GETPAGE() to obtain the page struct
7693 7693 * since we may need to read it from disk if its
7694 7694 * been paged out.
7695 7695 */
7696 7696 if (op != MC_LOCK)
7697 7697 pp = page_lookup(vp, off, SE_SHARED);
7698 7698 else {
7699 7699 page_t *pl[1 + 1];
7700 7700 int error;
7701 7701
7702 7702 ASSERT(vp != NULL);
7703 7703
7704 7704 error = VOP_GETPAGE(vp, (offset_t)off, PAGESIZE,
7705 7705 (uint_t *)NULL, pl, PAGESIZE, seg, addr,
7706 7706 S_OTHER, svd->cred, NULL);
7707 7707
7708 7708 if (error && ap != NULL) {
7709 7709 anon_array_exit(&cookie);
7710 7710 ANON_LOCK_EXIT(&->a_rwlock);
7711 7711 }
7712 7712
7713 7713 /*
7714 7714 * If the error is EDEADLK then we must bounce
7715 7715 * up and drop all vm subsystem locks and then
7716 7716 * retry the operation later
7717 7717 * This behavior is a temporary measure because
7718 7718 * ufs/sds logging is badly designed and will
7719 7719 * deadlock if we don't allow this bounce to
7720 7720 * happen. The real solution is to re-design
7721 7721 * the logging code to work properly. See bug
7722 7722 * 4125102 for details of the problem.
7723 7723 */
7724 7724 if (error == EDEADLK) {
7725 7725 err = error;
7726 7726 goto out;
7727 7727 }
7728 7728 /*
7729 7729 * Quit if we fail to fault in the page. Treat
7730 7730 * the failure as an error, unless the addr
7731 7731 * is mapped beyond the end of a file.
7732 7732 */
7733 7733 if (error && svd->vp) {
7734 7734 va.va_mask = AT_SIZE;
7735 7735 if (VOP_GETATTR(svd->vp, &va, 0,
7736 7736 svd->cred, NULL) != 0) {
7737 7737 err = EIO;
7738 7738 goto out;
7739 7739 }
7740 7740 if (btopr(va.va_size) >=
7741 7741 btopr(off + 1)) {
7742 7742 err = EIO;
7743 7743 goto out;
7744 7744 }
7745 7745 goto out;
7746 7746
7747 7747 } else if (error) {
7748 7748 err = EIO;
7749 7749 goto out;
7750 7750 }
7751 7751 pp = pl[0];
7752 7752 ASSERT(pp != NULL);
7753 7753 }
7754 7754
7755 7755 /*
7756 7756 * See Statement at the beginning of this routine.
7757 7757 *
7758 7758 * claim is always set if MAP_PRIVATE and PROT_WRITE
7759 7759 * irrespective of following factors:
7760 7760 *
7761 7761 * (1) anon slots are populated or not
7762 7762 * (2) cow is broken or not
7763 7763 * (3) refcnt on ap is 1 or greater than 1
7764 7764 *
7765 7765 * See 4140683 for details
7766 7766 */
7767 7767 claim = ((VPP_PROT(vpp) & PROT_WRITE) &&
7768 7768 (svd->type == MAP_PRIVATE));
7769 7769
7770 7770 /*
7771 7771 * Perform page-level operation appropriate to
7772 7772 * operation. If locking, undo the SOFTLOCK
7773 7773 * performed to bring the page into memory
7774 7774 * after setting the lock. If unlocking,
7775 7775 * and no page was found, account for the claim
7776 7776 * separately.
7777 7777 */
7778 7778 if (op == MC_LOCK) {
7779 7779 int ret = 1; /* Assume success */
7780 7780
7781 7781 ASSERT(!VPP_ISPPLOCK(vpp));
7782 7782
7783 7783 ret = page_pp_lock(pp, claim, 0);
7784 7784 if (ap != NULL) {
7785 7785 if (ap->an_pvp != NULL) {
7786 7786 anon_swap_free(ap, pp);
7787 7787 }
7788 7788 anon_array_exit(&cookie);
7789 7789 ANON_LOCK_EXIT(&->a_rwlock);
7790 7790 }
7791 7791 if (ret == 0) {
7792 7792 /* locking page failed */
7793 7793 page_unlock(pp);
7794 7794 err = EAGAIN;
7795 7795 goto out;
7796 7796 }
7797 7797 VPP_SETPPLOCK(vpp);
7798 7798 if (sp != NULL) {
7799 7799 if (pp->p_lckcnt == 1)
7800 7800 locked_bytes += PAGESIZE;
7801 7801 } else
7802 7802 locked_bytes += PAGESIZE;
7803 7803
7804 7804 if (lockmap != (ulong_t *)NULL)
7805 7805 BT_SET(lockmap, pos);
7806 7806
7807 7807 page_unlock(pp);
7808 7808 } else {
7809 7809 ASSERT(VPP_ISPPLOCK(vpp));
7810 7810 if (pp != NULL) {
7811 7811 /* sysV pages should be locked */
7812 7812 ASSERT(sp == NULL || pp->p_lckcnt > 0);
7813 7813 page_pp_unlock(pp, claim, 0);
7814 7814 if (sp != NULL) {
7815 7815 if (pp->p_lckcnt == 0)
7816 7816 unlocked_bytes
7817 7817 += PAGESIZE;
7818 7818 } else
7819 7819 unlocked_bytes += PAGESIZE;
7820 7820 page_unlock(pp);
7821 7821 } else {
7822 7822 ASSERT(sp == NULL);
7823 7823 unlocked_bytes += PAGESIZE;
7824 7824 }
7825 7825 VPP_CLRPPLOCK(vpp);
7826 7826 }
7827 7827 }
7828 7828 }
7829 7829 out:
7830 7830 if (op == MC_LOCK) {
7831 7831 /* Credit back bytes that did not get locked */
7832 7832 if ((unlocked_bytes - locked_bytes) > 0) {
7833 7833 if (proj == NULL)
7834 7834 mutex_enter(&p->p_lock);
7835 7835 rctl_decr_locked_mem(p, proj,
7836 7836 (unlocked_bytes - locked_bytes), chargeproc);
7837 7837 if (proj == NULL)
7838 7838 mutex_exit(&p->p_lock);
7839 7839 }
7840 7840
7841 7841 } else {
7842 7842 /* Account bytes that were unlocked */
7843 7843 if (unlocked_bytes > 0) {
7844 7844 if (proj == NULL)
7845 7845 mutex_enter(&p->p_lock);
7846 7846 rctl_decr_locked_mem(p, proj, unlocked_bytes,
7847 7847 chargeproc);
7848 7848 if (proj == NULL)
7849 7849 mutex_exit(&p->p_lock);
7850 7850 }
7851 7851 }
7852 7852 if (sp != NULL)
7853 7853 mutex_exit(&sp->shm_mlock);
7854 7854 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7855 7855
7856 7856 return (err);
7857 7857 }
7858 7858
7859 7859 /*
7860 7860 * Set advice from user for specified pages
7861 7861 * There are 9 types of advice:
7862 7862 * MADV_NORMAL - Normal (default) behavior (whatever that is)
7863 7863 * MADV_RANDOM - Random page references
7864 7864 * do not allow readahead or 'klustering'
7865 7865 * MADV_SEQUENTIAL - Sequential page references
7866 7866 * Pages previous to the one currently being
7867 7867 * accessed (determined by fault) are 'not needed'
7868 7868 * and are freed immediately
7869 7869 * MADV_WILLNEED - Pages are likely to be used (fault ahead in mctl)
7870 7870 * MADV_DONTNEED - Pages are not needed (synced out in mctl)
7871 7871 * MADV_FREE - Contents can be discarded
7872 7872 * MADV_ACCESS_DEFAULT- Default access
7873 7873 * MADV_ACCESS_LWP - Next LWP will access heavily
7874 7874 * MADV_ACCESS_MANY- Many LWPs or processes will access heavily
7875 7875 */
7876 7876 static int
7877 7877 segvn_advise(struct seg *seg, caddr_t addr, size_t len, uint_t behav)
7878 7878 {
7879 7879 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
7880 7880 size_t page;
7881 7881 int err = 0;
7882 7882 int already_set;
7883 7883 struct anon_map *amp;
7884 7884 ulong_t anon_index;
7885 7885 struct seg *next;
7886 7886 lgrp_mem_policy_t policy;
7887 7887 struct seg *prev;
7888 7888 struct vnode *vp;
7889 7889
7890 7890 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
7891 7891
7892 7892 /*
7893 7893 * In case of MADV_FREE, we won't be modifying any segment private
7894 7894 * data structures; so, we only need to grab READER's lock
7895 7895 */
7896 7896 if (behav != MADV_FREE) {
7897 7897 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
7898 7898 if (svd->tr_state != SEGVN_TR_OFF) {
7899 7899 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7900 7900 return (0);
7901 7901 }
7902 7902 } else {
7903 7903 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
7904 7904 }
7905 7905
7906 7906 /*
7907 7907 * Large pages are assumed to be only turned on when accesses to the
7908 7908 * segment's address range have spatial and temporal locality. That
7909 7909 * justifies ignoring MADV_SEQUENTIAL for large page segments.
7910 7910 * Also, ignore advice affecting lgroup memory allocation
7911 7911 * if don't need to do lgroup optimizations on this system
7912 7912 */
7913 7913
7914 7914 if ((behav == MADV_SEQUENTIAL &&
7915 7915 (seg->s_szc != 0 || HAT_IS_REGION_COOKIE_VALID(svd->rcookie))) ||
7916 7916 (!lgrp_optimizations() && (behav == MADV_ACCESS_DEFAULT ||
7917 7917 behav == MADV_ACCESS_LWP || behav == MADV_ACCESS_MANY))) {
7918 7918 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7919 7919 return (0);
7920 7920 }
7921 7921
7922 7922 if (behav == MADV_SEQUENTIAL || behav == MADV_ACCESS_DEFAULT ||
7923 7923 behav == MADV_ACCESS_LWP || behav == MADV_ACCESS_MANY) {
7924 7924 /*
7925 7925 * Since we are going to unload hat mappings
7926 7926 * we first have to flush the cache. Otherwise
7927 7927 * this might lead to system panic if another
7928 7928 * thread is doing physio on the range whose
7929 7929 * mappings are unloaded by madvise(3C).
7930 7930 */
7931 7931 if (svd->softlockcnt > 0) {
7932 7932 /*
7933 7933 * If this is shared segment non 0 softlockcnt
7934 7934 * means locked pages are still in use.
7935 7935 */
7936 7936 if (svd->type == MAP_SHARED) {
7937 7937 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7938 7938 return (EAGAIN);
7939 7939 }
7940 7940 /*
7941 7941 * Since we do have the segvn writers lock
7942 7942 * nobody can fill the cache with entries
7943 7943 * belonging to this seg during the purge.
7944 7944 * The flush either succeeds or we still
7945 7945 * have pending I/Os. In the later case,
7946 7946 * madvise(3C) fails.
7947 7947 */
7948 7948 segvn_purge(seg);
7949 7949 if (svd->softlockcnt > 0) {
7950 7950 /*
7951 7951 * Since madvise(3C) is advisory and
7952 7952 * it's not part of UNIX98, madvise(3C)
7953 7953 * failure here doesn't cause any hardship.
7954 7954 * Note that we don't block in "as" layer.
7955 7955 */
7956 7956 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7957 7957 return (EAGAIN);
7958 7958 }
7959 7959 } else if (svd->type == MAP_SHARED && svd->amp != NULL &&
7960 7960 svd->amp->a_softlockcnt > 0) {
7961 7961 /*
7962 7962 * Try to purge this amp's entries from pcache. It
7963 7963 * will succeed only if other segments that share the
7964 7964 * amp have no outstanding softlock's.
7965 7965 */
7966 7966 segvn_purge(seg);
7967 7967 }
7968 7968 }
7969 7969
7970 7970 amp = svd->amp;
7971 7971 vp = svd->vp;
7972 7972 if (behav == MADV_FREE) {
7973 7973 /*
7974 7974 * MADV_FREE is not supported for segments with
7975 7975 * underlying object; if anonmap is NULL, anon slots
7976 7976 * are not yet populated and there is nothing for
7977 7977 * us to do. As MADV_FREE is advisory, we don't
7978 7978 * return error in either case.
7979 7979 */
7980 7980 if (vp != NULL || amp == NULL) {
7981 7981 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7982 7982 return (0);
7983 7983 }
7984 7984
7985 7985 segvn_purge(seg);
7986 7986
7987 7987 page = seg_page(seg, addr);
7988 7988 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
7989 7989 anon_disclaim(amp, svd->anon_index + page, len);
7990 7990 ANON_LOCK_EXIT(&->a_rwlock);
7991 7991 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
7992 7992 return (0);
7993 7993 }
7994 7994
7995 7995 /*
7996 7996 * If advice is to be applied to entire segment,
7997 7997 * use advice field in seg_data structure
7998 7998 * otherwise use appropriate vpage entry.
7999 7999 */
8000 8000 if ((addr == seg->s_base) && (len == seg->s_size)) {
8001 8001 switch (behav) {
8002 8002 case MADV_ACCESS_LWP:
8003 8003 case MADV_ACCESS_MANY:
8004 8004 case MADV_ACCESS_DEFAULT:
8005 8005 /*
8006 8006 * Set memory allocation policy for this segment
8007 8007 */
8008 8008 policy = lgrp_madv_to_policy(behav, len, svd->type);
8009 8009 if (svd->type == MAP_SHARED)
8010 8010 already_set = lgrp_shm_policy_set(policy, amp,
8011 8011 svd->anon_index, vp, svd->offset, len);
8012 8012 else {
8013 8013 /*
8014 8014 * For private memory, need writers lock on
8015 8015 * address space because the segment may be
8016 8016 * split or concatenated when changing policy
8017 8017 */
8018 8018 if (AS_READ_HELD(seg->s_as,
8019 8019 &seg->s_as->a_lock)) {
8020 8020 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
8021 8021 return (IE_RETRY);
8022 8022 }
8023 8023
8024 8024 already_set = lgrp_privm_policy_set(policy,
8025 8025 &svd->policy_info, len);
8026 8026 }
8027 8027
8028 8028 /*
8029 8029 * If policy set already and it shouldn't be reapplied,
8030 8030 * don't do anything.
8031 8031 */
8032 8032 if (already_set &&
8033 8033 !LGRP_MEM_POLICY_REAPPLICABLE(policy))
8034 8034 break;
8035 8035
8036 8036 /*
8037 8037 * Mark any existing pages in given range for
8038 8038 * migration
8039 8039 */
8040 8040 page_mark_migrate(seg, addr, len, amp, svd->anon_index,
8041 8041 vp, svd->offset, 1);
8042 8042
8043 8043 /*
8044 8044 * If same policy set already or this is a shared
8045 8045 * memory segment, don't need to try to concatenate
8046 8046 * segment with adjacent ones.
8047 8047 */
8048 8048 if (already_set || svd->type == MAP_SHARED)
8049 8049 break;
8050 8050
8051 8051 /*
8052 8052 * Try to concatenate this segment with previous
8053 8053 * one and next one, since we changed policy for
8054 8054 * this one and it may be compatible with adjacent
8055 8055 * ones now.
8056 8056 */
8057 8057 prev = AS_SEGPREV(seg->s_as, seg);
8058 8058 next = AS_SEGNEXT(seg->s_as, seg);
8059 8059
8060 8060 if (next && next->s_ops == &segvn_ops &&
8061 8061 addr + len == next->s_base)
8062 8062 (void) segvn_concat(seg, next, 1);
8063 8063
8064 8064 if (prev && prev->s_ops == &segvn_ops &&
8065 8065 addr == prev->s_base + prev->s_size) {
8066 8066 /*
8067 8067 * Drop lock for private data of current
8068 8068 * segment before concatenating (deleting) it
8069 8069 * and return IE_REATTACH to tell as_ctl() that
8070 8070 * current segment has changed
8071 8071 */
8072 8072 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
8073 8073 if (!segvn_concat(prev, seg, 1))
8074 8074 err = IE_REATTACH;
8075 8075
8076 8076 return (err);
8077 8077 }
8078 8078 break;
8079 8079
8080 8080 case MADV_SEQUENTIAL:
8081 8081 /*
8082 8082 * unloading mapping guarantees
8083 8083 * detection in segvn_fault
8084 8084 */
8085 8085 ASSERT(seg->s_szc == 0);
8086 8086 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
8087 8087 hat_unload(seg->s_as->a_hat, addr, len,
8088 8088 HAT_UNLOAD);
8089 8089 /* FALLTHROUGH */
8090 8090 case MADV_NORMAL:
8091 8091 case MADV_RANDOM:
8092 8092 svd->advice = (uchar_t)behav;
8093 8093 svd->pageadvice = 0;
8094 8094 break;
8095 8095 case MADV_WILLNEED: /* handled in memcntl */
8096 8096 case MADV_DONTNEED: /* handled in memcntl */
8097 8097 case MADV_FREE: /* handled above */
8098 8098 break;
8099 8099 default:
8100 8100 err = EINVAL;
8101 8101 }
8102 8102 } else {
8103 8103 caddr_t eaddr;
8104 8104 struct seg *new_seg;
8105 8105 struct segvn_data *new_svd;
8106 8106 u_offset_t off;
8107 8107 caddr_t oldeaddr;
8108 8108
8109 8109 page = seg_page(seg, addr);
8110 8110
8111 8111 segvn_vpage(seg);
8112 8112 if (svd->vpage == NULL) {
8113 8113 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
8114 8114 return (ENOMEM);
8115 8115 }
8116 8116
8117 8117 switch (behav) {
8118 8118 struct vpage *bvpp, *evpp;
8119 8119
8120 8120 case MADV_ACCESS_LWP:
8121 8121 case MADV_ACCESS_MANY:
8122 8122 case MADV_ACCESS_DEFAULT:
8123 8123 /*
8124 8124 * Set memory allocation policy for portion of this
8125 8125 * segment
8126 8126 */
8127 8127
8128 8128 /*
8129 8129 * Align address and length of advice to page
8130 8130 * boundaries for large pages
8131 8131 */
8132 8132 if (seg->s_szc != 0) {
8133 8133 size_t pgsz;
8134 8134
8135 8135 pgsz = page_get_pagesize(seg->s_szc);
8136 8136 addr = (caddr_t)P2ALIGN((uintptr_t)addr, pgsz);
8137 8137 len = P2ROUNDUP(len, pgsz);
8138 8138 }
8139 8139
8140 8140 /*
8141 8141 * Check to see whether policy is set already
8142 8142 */
8143 8143 policy = lgrp_madv_to_policy(behav, len, svd->type);
8144 8144
8145 8145 anon_index = svd->anon_index + page;
8146 8146 off = svd->offset + (uintptr_t)(addr - seg->s_base);
8147 8147
8148 8148 if (svd->type == MAP_SHARED)
8149 8149 already_set = lgrp_shm_policy_set(policy, amp,
8150 8150 anon_index, vp, off, len);
8151 8151 else
8152 8152 already_set =
8153 8153 (policy == svd->policy_info.mem_policy);
8154 8154
8155 8155 /*
8156 8156 * If policy set already and it shouldn't be reapplied,
8157 8157 * don't do anything.
8158 8158 */
8159 8159 if (already_set &&
8160 8160 !LGRP_MEM_POLICY_REAPPLICABLE(policy))
8161 8161 break;
8162 8162
8163 8163 /*
8164 8164 * For private memory, need writers lock on
8165 8165 * address space because the segment may be
8166 8166 * split or concatenated when changing policy
8167 8167 */
8168 8168 if (svd->type == MAP_PRIVATE &&
8169 8169 AS_READ_HELD(seg->s_as, &seg->s_as->a_lock)) {
8170 8170 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
8171 8171 return (IE_RETRY);
8172 8172 }
8173 8173
8174 8174 /*
8175 8175 * Mark any existing pages in given range for
8176 8176 * migration
8177 8177 */
8178 8178 page_mark_migrate(seg, addr, len, amp, svd->anon_index,
8179 8179 vp, svd->offset, 1);
8180 8180
8181 8181 /*
8182 8182 * Don't need to try to split or concatenate
8183 8183 * segments, since policy is same or this is a shared
8184 8184 * memory segment
8185 8185 */
8186 8186 if (already_set || svd->type == MAP_SHARED)
8187 8187 break;
8188 8188
8189 8189 if (HAT_IS_REGION_COOKIE_VALID(svd->rcookie)) {
8190 8190 ASSERT(svd->amp == NULL);
8191 8191 ASSERT(svd->tr_state == SEGVN_TR_OFF);
8192 8192 ASSERT(svd->softlockcnt == 0);
8193 8193 hat_leave_region(seg->s_as->a_hat, svd->rcookie,
8194 8194 HAT_REGION_TEXT);
8195 8195 svd->rcookie = HAT_INVALID_REGION_COOKIE;
8196 8196 }
8197 8197
8198 8198 /*
8199 8199 * Split off new segment if advice only applies to a
8200 8200 * portion of existing segment starting in middle
8201 8201 */
8202 8202 new_seg = NULL;
8203 8203 eaddr = addr + len;
8204 8204 oldeaddr = seg->s_base + seg->s_size;
8205 8205 if (addr > seg->s_base) {
8206 8206 /*
8207 8207 * Must flush I/O page cache
8208 8208 * before splitting segment
8209 8209 */
8210 8210 if (svd->softlockcnt > 0)
8211 8211 segvn_purge(seg);
8212 8212
8213 8213 /*
8214 8214 * Split segment and return IE_REATTACH to tell
8215 8215 * as_ctl() that current segment changed
8216 8216 */
8217 8217 new_seg = segvn_split_seg(seg, addr);
8218 8218 new_svd = (struct segvn_data *)new_seg->s_data;
8219 8219 err = IE_REATTACH;
8220 8220
8221 8221 /*
8222 8222 * If new segment ends where old one
8223 8223 * did, try to concatenate the new
8224 8224 * segment with next one.
8225 8225 */
8226 8226 if (eaddr == oldeaddr) {
8227 8227 /*
8228 8228 * Set policy for new segment
8229 8229 */
8230 8230 (void) lgrp_privm_policy_set(policy,
8231 8231 &new_svd->policy_info,
8232 8232 new_seg->s_size);
8233 8233
8234 8234 next = AS_SEGNEXT(new_seg->s_as,
8235 8235 new_seg);
8236 8236
8237 8237 if (next &&
8238 8238 next->s_ops == &segvn_ops &&
8239 8239 eaddr == next->s_base)
8240 8240 (void) segvn_concat(new_seg,
8241 8241 next, 1);
8242 8242 }
8243 8243 }
8244 8244
8245 8245 /*
8246 8246 * Split off end of existing segment if advice only
8247 8247 * applies to a portion of segment ending before
8248 8248 * end of the existing segment
8249 8249 */
8250 8250 if (eaddr < oldeaddr) {
8251 8251 /*
8252 8252 * Must flush I/O page cache
8253 8253 * before splitting segment
8254 8254 */
8255 8255 if (svd->softlockcnt > 0)
8256 8256 segvn_purge(seg);
8257 8257
8258 8258 /*
8259 8259 * If beginning of old segment was already
8260 8260 * split off, use new segment to split end off
8261 8261 * from.
8262 8262 */
8263 8263 if (new_seg != NULL && new_seg != seg) {
8264 8264 /*
8265 8265 * Split segment
8266 8266 */
8267 8267 (void) segvn_split_seg(new_seg, eaddr);
8268 8268
8269 8269 /*
8270 8270 * Set policy for new segment
8271 8271 */
8272 8272 (void) lgrp_privm_policy_set(policy,
8273 8273 &new_svd->policy_info,
8274 8274 new_seg->s_size);
8275 8275 } else {
8276 8276 /*
8277 8277 * Split segment and return IE_REATTACH
8278 8278 * to tell as_ctl() that current
8279 8279 * segment changed
8280 8280 */
8281 8281 (void) segvn_split_seg(seg, eaddr);
8282 8282 err = IE_REATTACH;
8283 8283
8284 8284 (void) lgrp_privm_policy_set(policy,
8285 8285 &svd->policy_info, seg->s_size);
8286 8286
8287 8287 /*
8288 8288 * If new segment starts where old one
8289 8289 * did, try to concatenate it with
8290 8290 * previous segment.
8291 8291 */
8292 8292 if (addr == seg->s_base) {
8293 8293 prev = AS_SEGPREV(seg->s_as,
8294 8294 seg);
8295 8295
8296 8296 /*
8297 8297 * Drop lock for private data
8298 8298 * of current segment before
8299 8299 * concatenating (deleting) it
8300 8300 */
8301 8301 if (prev &&
8302 8302 prev->s_ops ==
8303 8303 &segvn_ops &&
8304 8304 addr == prev->s_base +
8305 8305 prev->s_size) {
8306 8306 SEGVN_LOCK_EXIT(
8307 8307 seg->s_as,
8308 8308 &svd->lock);
8309 8309 (void) segvn_concat(
8310 8310 prev, seg, 1);
8311 8311 return (err);
8312 8312 }
8313 8313 }
8314 8314 }
8315 8315 }
8316 8316 break;
8317 8317 case MADV_SEQUENTIAL:
8318 8318 ASSERT(seg->s_szc == 0);
8319 8319 ASSERT(svd->rcookie == HAT_INVALID_REGION_COOKIE);
8320 8320 hat_unload(seg->s_as->a_hat, addr, len, HAT_UNLOAD);
8321 8321 /* FALLTHROUGH */
8322 8322 case MADV_NORMAL:
8323 8323 case MADV_RANDOM:
8324 8324 bvpp = &svd->vpage[page];
8325 8325 evpp = &svd->vpage[page + (len >> PAGESHIFT)];
8326 8326 for (; bvpp < evpp; bvpp++)
8327 8327 VPP_SETADVICE(bvpp, behav);
8328 8328 svd->advice = MADV_NORMAL;
8329 8329 break;
8330 8330 case MADV_WILLNEED: /* handled in memcntl */
8331 8331 case MADV_DONTNEED: /* handled in memcntl */
8332 8332 case MADV_FREE: /* handled above */
8333 8333 break;
8334 8334 default:
8335 8335 err = EINVAL;
8336 8336 }
8337 8337 }
8338 8338 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
8339 8339 return (err);
8340 8340 }
8341 8341
8342 8342 /*
8343 8343 * There is one kind of inheritance that can be specified for pages:
8344 8344 *
8345 8345 * SEGP_INH_ZERO - Pages should be zeroed in the child
8346 8346 */
8347 8347 static int
8348 8348 segvn_inherit(struct seg *seg, caddr_t addr, size_t len, uint_t behav)
8349 8349 {
8350 8350 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
8351 8351 struct vpage *bvpp, *evpp;
8352 8352 size_t page;
8353 8353 int ret = 0;
8354 8354
8355 8355 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
8356 8356
8357 8357 /* Can't support something we don't know about */
8358 8358 if (behav != SEGP_INH_ZERO)
8359 8359 return (ENOTSUP);
8360 8360
8361 8361 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_WRITER);
8362 8362
8363 8363 /*
8364 8364 * This must be a straightforward anonymous segment that is mapped
8365 8365 * privately and is not backed by a vnode.
8366 8366 */
8367 8367 if (svd->tr_state != SEGVN_TR_OFF ||
8368 8368 svd->type != MAP_PRIVATE ||
8369 8369 svd->vp != NULL) {
8370 8370 ret = EINVAL;
8371 8371 goto out;
8372 8372 }
8373 8373
8374 8374 /*
8375 8375 * If the entire segment has been marked as inherit zero, then no reason
8376 8376 * to do anything else.
8377 8377 */
8378 8378 if (svd->svn_inz == SEGVN_INZ_ALL) {
8379 8379 ret = 0;
8380 8380 goto out;
8381 8381 }
8382 8382
8383 8383 /*
8384 8384 * If this applies to the entire segment, simply mark it and we're done.
8385 8385 */
8386 8386 if ((addr == seg->s_base) && (len == seg->s_size)) {
8387 8387 svd->svn_inz = SEGVN_INZ_ALL;
8388 8388 ret = 0;
8389 8389 goto out;
8390 8390 }
8391 8391
8392 8392 /*
8393 8393 * We've been asked to mark a subset of this segment as inherit zero,
8394 8394 * therefore we need to mainpulate its vpages.
8395 8395 */
8396 8396 if (svd->vpage == NULL) {
8397 8397 segvn_vpage(seg);
8398 8398 if (svd->vpage == NULL) {
8399 8399 ret = ENOMEM;
8400 8400 goto out;
8401 8401 }
8402 8402 }
8403 8403
8404 8404 svd->svn_inz = SEGVN_INZ_VPP;
8405 8405 page = seg_page(seg, addr);
8406 8406 bvpp = &svd->vpage[page];
8407 8407 evpp = &svd->vpage[page + (len >> PAGESHIFT)];
8408 8408 for (; bvpp < evpp; bvpp++)
8409 8409 VPP_SETINHZERO(bvpp);
8410 8410 ret = 0;
8411 8411
8412 8412 out:
8413 8413 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
8414 8414 return (ret);
8415 8415 }
8416 8416
8417 8417 /*
8418 8418 * Create a vpage structure for this seg.
8419 8419 */
8420 8420 static void
8421 8421 segvn_vpage(struct seg *seg)
8422 8422 {
8423 8423 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
8424 8424 struct vpage *vp, *evp;
8425 8425 static pgcnt_t page_limit = 0;
8426 8426
8427 8427 ASSERT(SEGVN_WRITE_HELD(seg->s_as, &svd->lock));
8428 8428
8429 8429 /*
8430 8430 * If no vpage structure exists, allocate one. Copy the protections
8431 8431 * and the advice from the segment itself to the individual pages.
8432 8432 */
8433 8433 if (svd->vpage == NULL) {
8434 8434 /*
8435 8435 * Start by calculating the number of pages we must allocate to
8436 8436 * track the per-page vpage structs needs for this entire
8437 8437 * segment. If we know now that it will require more than our
8438 8438 * heuristic for the maximum amount of kmem we can consume then
8439 8439 * fail. We do this here, instead of trying to detect this deep
8440 8440 * in page_resv and propagating the error up, since the entire
8441 8441 * memory allocation stack is not amenable to passing this
8442 8442 * back. Instead, it wants to keep trying.
8443 8443 *
8444 8444 * As a heuristic we set a page limit of 5/8s of total_pages
8445 8445 * for this allocation. We use shifts so that no floating
8446 8446 * point conversion takes place and only need to do the
8447 8447 * calculation once.
8448 8448 */
8449 8449 ulong_t mem_needed = seg_pages(seg) * sizeof (struct vpage);
8450 8450 pgcnt_t npages = mem_needed >> PAGESHIFT;
8451 8451
8452 8452 if (page_limit == 0)
8453 8453 page_limit = (total_pages >> 1) + (total_pages >> 3);
8454 8454
8455 8455 if (npages > page_limit)
8456 8456 return;
8457 8457
8458 8458 svd->pageadvice = 1;
8459 8459 svd->vpage = kmem_zalloc(mem_needed, KM_SLEEP);
8460 8460 evp = &svd->vpage[seg_page(seg, seg->s_base + seg->s_size)];
8461 8461 for (vp = svd->vpage; vp < evp; vp++) {
8462 8462 VPP_SETPROT(vp, svd->prot);
8463 8463 VPP_SETADVICE(vp, svd->advice);
8464 8464 }
8465 8465 }
8466 8466 }
8467 8467
8468 8468 /*
8469 8469 * Dump the pages belonging to this segvn segment.
8470 8470 */
8471 8471 static void
8472 8472 segvn_dump(struct seg *seg)
8473 8473 {
8474 8474 struct segvn_data *svd;
8475 8475 page_t *pp;
8476 8476 struct anon_map *amp;
8477 8477 ulong_t anon_index;
8478 8478 struct vnode *vp;
8479 8479 u_offset_t off, offset;
8480 8480 pfn_t pfn;
8481 8481 pgcnt_t page, npages;
8482 8482 caddr_t addr;
8483 8483
8484 8484 npages = seg_pages(seg);
8485 8485 svd = (struct segvn_data *)seg->s_data;
8486 8486 vp = svd->vp;
8487 8487 off = offset = svd->offset;
8488 8488 addr = seg->s_base;
8489 8489
8490 8490 if ((amp = svd->amp) != NULL) {
8491 8491 anon_index = svd->anon_index;
8492 8492 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
8493 8493 }
8494 8494
8495 8495 for (page = 0; page < npages; page++, offset += PAGESIZE) {
8496 8496 struct anon *ap;
8497 8497 int we_own_it = 0;
8498 8498
8499 8499 if (amp && (ap = anon_get_ptr(svd->amp->ahp, anon_index++))) {
8500 8500 swap_xlate_nopanic(ap, &vp, &off);
8501 8501 } else {
8502 8502 vp = svd->vp;
8503 8503 off = offset;
8504 8504 }
8505 8505
8506 8506 /*
8507 8507 * If pp == NULL, the page either does not exist
8508 8508 * or is exclusively locked. So determine if it
8509 8509 * exists before searching for it.
8510 8510 */
8511 8511
8512 8512 if ((pp = page_lookup_nowait(vp, off, SE_SHARED)))
8513 8513 we_own_it = 1;
8514 8514 else
8515 8515 pp = page_exists(vp, off);
8516 8516
8517 8517 if (pp) {
8518 8518 pfn = page_pptonum(pp);
8519 8519 dump_addpage(seg->s_as, addr, pfn);
8520 8520 if (we_own_it)
8521 8521 page_unlock(pp);
8522 8522 }
8523 8523 addr += PAGESIZE;
8524 8524 dump_timeleft = dump_timeout;
8525 8525 }
8526 8526
8527 8527 if (amp != NULL)
8528 8528 ANON_LOCK_EXIT(&->a_rwlock);
8529 8529 }
8530 8530
8531 8531 #ifdef DEBUG
8532 8532 static uint32_t segvn_pglock_mtbf = 0;
8533 8533 #endif
8534 8534
8535 8535 #define PCACHE_SHWLIST ((page_t *)-2)
8536 8536 #define NOPCACHE_SHWLIST ((page_t *)-1)
8537 8537
8538 8538 /*
8539 8539 * Lock/Unlock anon pages over a given range. Return shadow list. This routine
8540 8540 * uses global segment pcache to cache shadow lists (i.e. pp arrays) of pages
8541 8541 * to avoid the overhead of per page locking, unlocking for subsequent IOs to
8542 8542 * the same parts of the segment. Currently shadow list creation is only
8543 8543 * supported for pure anon segments. MAP_PRIVATE segment pcache entries are
8544 8544 * tagged with segment pointer, starting virtual address and length. This
8545 8545 * approach for MAP_SHARED segments may add many pcache entries for the same
8546 8546 * set of pages and lead to long hash chains that decrease pcache lookup
8547 8547 * performance. To avoid this issue for shared segments shared anon map and
8548 8548 * starting anon index are used for pcache entry tagging. This allows all
8549 8549 * segments to share pcache entries for the same anon range and reduces pcache
8550 8550 * chain's length as well as memory overhead from duplicate shadow lists and
8551 8551 * pcache entries.
8552 8552 *
8553 8553 * softlockcnt field in segvn_data structure counts the number of F_SOFTLOCK'd
8554 8554 * pages via segvn_fault() and pagelock'd pages via this routine. But pagelock
8555 8555 * part of softlockcnt accounting is done differently for private and shared
8556 8556 * segments. In private segment case softlock is only incremented when a new
8557 8557 * shadow list is created but not when an existing one is found via
8558 8558 * seg_plookup(). pcache entries have reference count incremented/decremented
8559 8559 * by each seg_plookup()/seg_pinactive() operation. Only entries that have 0
8560 8560 * reference count can be purged (and purging is needed before segment can be
8561 8561 * freed). When a private segment pcache entry is purged segvn_reclaim() will
8562 8562 * decrement softlockcnt. Since in private segment case each of its pcache
8563 8563 * entries only belongs to this segment we can expect that when
8564 8564 * segvn_pagelock(L_PAGEUNLOCK) was called for all outstanding IOs in this
8565 8565 * segment purge will succeed and softlockcnt will drop to 0. In shared
8566 8566 * segment case reference count in pcache entry counts active locks from many
8567 8567 * different segments so we can't expect segment purging to succeed even when
8568 8568 * segvn_pagelock(L_PAGEUNLOCK) was called for all outstanding IOs in this
8569 8569 * segment. To be able to determine when there're no pending pagelocks in
8570 8570 * shared segment case we don't rely on purging to make softlockcnt drop to 0
8571 8571 * but instead softlockcnt is incremented and decremented for every
8572 8572 * segvn_pagelock(L_PAGELOCK/L_PAGEUNLOCK) call regardless if a new shadow
8573 8573 * list was created or an existing one was found. When softlockcnt drops to 0
8574 8574 * this segment no longer has any claims for pcached shadow lists and the
8575 8575 * segment can be freed even if there're still active pcache entries
8576 8576 * shared by this segment anon map. Shared segment pcache entries belong to
8577 8577 * anon map and are typically removed when anon map is freed after all
8578 8578 * processes destroy the segments that use this anon map.
8579 8579 */
8580 8580 static int
8581 8581 segvn_pagelock(struct seg *seg, caddr_t addr, size_t len, struct page ***ppp,
8582 8582 enum lock_type type, enum seg_rw rw)
8583 8583 {
8584 8584 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
8585 8585 size_t np;
8586 8586 pgcnt_t adjustpages;
8587 8587 pgcnt_t npages;
8588 8588 ulong_t anon_index;
8589 8589 uint_t protchk = (rw == S_READ) ? PROT_READ : PROT_WRITE;
8590 8590 uint_t error;
8591 8591 struct anon_map *amp;
8592 8592 pgcnt_t anpgcnt;
8593 8593 struct page **pplist, **pl, *pp;
8594 8594 caddr_t a;
8595 8595 size_t page;
8596 8596 caddr_t lpgaddr, lpgeaddr;
8597 8597 anon_sync_obj_t cookie;
8598 8598 int anlock;
8599 8599 struct anon_map *pamp;
8600 8600 caddr_t paddr;
8601 8601 seg_preclaim_cbfunc_t preclaim_callback;
8602 8602 size_t pgsz;
8603 8603 int use_pcache;
8604 8604 size_t wlen;
8605 8605 uint_t pflags = 0;
8606 8606 int sftlck_sbase = 0;
8607 8607 int sftlck_send = 0;
8608 8608
8609 8609 #ifdef DEBUG
8610 8610 if (type == L_PAGELOCK && segvn_pglock_mtbf) {
8611 8611 hrtime_t ts = gethrtime();
8612 8612 if ((ts % segvn_pglock_mtbf) == 0) {
8613 8613 return (ENOTSUP);
8614 8614 }
8615 8615 if ((ts % segvn_pglock_mtbf) == 1) {
8616 8616 return (EFAULT);
8617 8617 }
8618 8618 }
8619 8619 #endif
8620 8620
8621 8621 TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_START,
8622 8622 "segvn_pagelock: start seg %p addr %p", seg, addr);
8623 8623
8624 8624 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
8625 8625 ASSERT(type == L_PAGELOCK || type == L_PAGEUNLOCK);
8626 8626
8627 8627 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
8628 8628
8629 8629 /*
8630 8630 * for now we only support pagelock to anon memory. We would have to
8631 8631 * check protections for vnode objects and call into the vnode driver.
8632 8632 * That's too much for a fast path. Let the fault entry point handle
8633 8633 * it.
8634 8634 */
8635 8635 if (svd->vp != NULL) {
8636 8636 if (type == L_PAGELOCK) {
8637 8637 error = ENOTSUP;
8638 8638 goto out;
8639 8639 }
8640 8640 panic("segvn_pagelock(L_PAGEUNLOCK): vp != NULL");
8641 8641 }
8642 8642 if ((amp = svd->amp) == NULL) {
8643 8643 if (type == L_PAGELOCK) {
8644 8644 error = EFAULT;
8645 8645 goto out;
8646 8646 }
8647 8647 panic("segvn_pagelock(L_PAGEUNLOCK): amp == NULL");
8648 8648 }
8649 8649 if (rw != S_READ && rw != S_WRITE) {
8650 8650 if (type == L_PAGELOCK) {
8651 8651 error = ENOTSUP;
8652 8652 goto out;
8653 8653 }
8654 8654 panic("segvn_pagelock(L_PAGEUNLOCK): bad rw");
8655 8655 }
8656 8656
8657 8657 if (seg->s_szc != 0) {
8658 8658 /*
8659 8659 * We are adjusting the pagelock region to the large page size
8660 8660 * boundary because the unlocked part of a large page cannot
8661 8661 * be freed anyway unless all constituent pages of a large
8662 8662 * page are locked. Bigger regions reduce pcache chain length
8663 8663 * and improve lookup performance. The tradeoff is that the
8664 8664 * very first segvn_pagelock() call for a given page is more
8665 8665 * expensive if only 1 page_t is needed for IO. This is only
8666 8666 * an issue if pcache entry doesn't get reused by several
8667 8667 * subsequent calls. We optimize here for the case when pcache
8668 8668 * is heavily used by repeated IOs to the same address range.
8669 8669 *
8670 8670 * Note segment's page size cannot change while we are holding
8671 8671 * as lock. And then it cannot change while softlockcnt is
8672 8672 * not 0. This will allow us to correctly recalculate large
8673 8673 * page size region for the matching pageunlock/reclaim call
8674 8674 * since as_pageunlock() caller must always match
8675 8675 * as_pagelock() call's addr and len.
8676 8676 *
8677 8677 * For pageunlock *ppp points to the pointer of page_t that
8678 8678 * corresponds to the real unadjusted start address. Similar
8679 8679 * for pagelock *ppp must point to the pointer of page_t that
8680 8680 * corresponds to the real unadjusted start address.
8681 8681 */
8682 8682 pgsz = page_get_pagesize(seg->s_szc);
8683 8683 CALC_LPG_REGION(pgsz, seg, addr, len, lpgaddr, lpgeaddr);
8684 8684 adjustpages = btop((uintptr_t)(addr - lpgaddr));
8685 8685 } else if (len < segvn_pglock_comb_thrshld) {
8686 8686 lpgaddr = addr;
8687 8687 lpgeaddr = addr + len;
8688 8688 adjustpages = 0;
8689 8689 pgsz = PAGESIZE;
8690 8690 } else {
8691 8691 /*
8692 8692 * Align the address range of large enough requests to allow
8693 8693 * combining of different shadow lists into 1 to reduce memory
8694 8694 * overhead from potentially overlapping large shadow lists
8695 8695 * (worst case is we have a 1MB IO into buffers with start
8696 8696 * addresses separated by 4K). Alignment is only possible if
8697 8697 * padded chunks have sufficient access permissions. Note
8698 8698 * permissions won't change between L_PAGELOCK and
8699 8699 * L_PAGEUNLOCK calls since non 0 softlockcnt will force
8700 8700 * segvn_setprot() to wait until softlockcnt drops to 0. This
8701 8701 * allows us to determine in L_PAGEUNLOCK the same range we
8702 8702 * computed in L_PAGELOCK.
8703 8703 *
8704 8704 * If alignment is limited by segment ends set
8705 8705 * sftlck_sbase/sftlck_send flags. In L_PAGELOCK case when
8706 8706 * these flags are set bump softlockcnt_sbase/softlockcnt_send
8707 8707 * per segment counters. In L_PAGEUNLOCK case decrease
8708 8708 * softlockcnt_sbase/softlockcnt_send counters if
8709 8709 * sftlck_sbase/sftlck_send flags are set. When
8710 8710 * softlockcnt_sbase/softlockcnt_send are non 0
8711 8711 * segvn_concat()/segvn_extend_prev()/segvn_extend_next()
8712 8712 * won't merge the segments. This restriction combined with
8713 8713 * restriction on segment unmapping and splitting for segments
8714 8714 * that have non 0 softlockcnt allows L_PAGEUNLOCK to
8715 8715 * correctly determine the same range that was previously
8716 8716 * locked by matching L_PAGELOCK.
8717 8717 */
8718 8718 pflags = SEGP_PSHIFT | (segvn_pglock_comb_bshift << 16);
8719 8719 pgsz = PAGESIZE;
8720 8720 if (svd->type == MAP_PRIVATE) {
8721 8721 lpgaddr = (caddr_t)P2ALIGN((uintptr_t)addr,
8722 8722 segvn_pglock_comb_balign);
8723 8723 if (lpgaddr < seg->s_base) {
8724 8724 lpgaddr = seg->s_base;
8725 8725 sftlck_sbase = 1;
8726 8726 }
8727 8727 } else {
8728 8728 ulong_t aix = svd->anon_index + seg_page(seg, addr);
8729 8729 ulong_t aaix = P2ALIGN(aix, segvn_pglock_comb_palign);
8730 8730 if (aaix < svd->anon_index) {
8731 8731 lpgaddr = seg->s_base;
8732 8732 sftlck_sbase = 1;
8733 8733 } else {
8734 8734 lpgaddr = addr - ptob(aix - aaix);
8735 8735 ASSERT(lpgaddr >= seg->s_base);
8736 8736 }
8737 8737 }
8738 8738 if (svd->pageprot && lpgaddr != addr) {
8739 8739 struct vpage *vp = &svd->vpage[seg_page(seg, lpgaddr)];
8740 8740 struct vpage *evp = &svd->vpage[seg_page(seg, addr)];
8741 8741 while (vp < evp) {
8742 8742 if ((VPP_PROT(vp) & protchk) == 0) {
8743 8743 break;
8744 8744 }
8745 8745 vp++;
8746 8746 }
8747 8747 if (vp < evp) {
8748 8748 lpgaddr = addr;
8749 8749 pflags = 0;
8750 8750 }
8751 8751 }
8752 8752 lpgeaddr = addr + len;
8753 8753 if (pflags) {
8754 8754 if (svd->type == MAP_PRIVATE) {
8755 8755 lpgeaddr = (caddr_t)P2ROUNDUP(
8756 8756 (uintptr_t)lpgeaddr,
8757 8757 segvn_pglock_comb_balign);
8758 8758 } else {
8759 8759 ulong_t aix = svd->anon_index +
8760 8760 seg_page(seg, lpgeaddr);
8761 8761 ulong_t aaix = P2ROUNDUP(aix,
8762 8762 segvn_pglock_comb_palign);
8763 8763 if (aaix < aix) {
8764 8764 lpgeaddr = 0;
8765 8765 } else {
8766 8766 lpgeaddr += ptob(aaix - aix);
8767 8767 }
8768 8768 }
8769 8769 if (lpgeaddr == 0 ||
8770 8770 lpgeaddr > seg->s_base + seg->s_size) {
8771 8771 lpgeaddr = seg->s_base + seg->s_size;
8772 8772 sftlck_send = 1;
8773 8773 }
8774 8774 }
8775 8775 if (svd->pageprot && lpgeaddr != addr + len) {
8776 8776 struct vpage *vp;
8777 8777 struct vpage *evp;
8778 8778
8779 8779 vp = &svd->vpage[seg_page(seg, addr + len)];
8780 8780 evp = &svd->vpage[seg_page(seg, lpgeaddr)];
8781 8781
8782 8782 while (vp < evp) {
8783 8783 if ((VPP_PROT(vp) & protchk) == 0) {
8784 8784 break;
8785 8785 }
8786 8786 vp++;
8787 8787 }
8788 8788 if (vp < evp) {
8789 8789 lpgeaddr = addr + len;
8790 8790 }
8791 8791 }
8792 8792 adjustpages = btop((uintptr_t)(addr - lpgaddr));
8793 8793 }
8794 8794
8795 8795 /*
8796 8796 * For MAP_SHARED segments we create pcache entries tagged by amp and
8797 8797 * anon index so that we can share pcache entries with other segments
8798 8798 * that map this amp. For private segments pcache entries are tagged
8799 8799 * with segment and virtual address.
8800 8800 */
8801 8801 if (svd->type == MAP_SHARED) {
8802 8802 pamp = amp;
8803 8803 paddr = (caddr_t)((lpgaddr - seg->s_base) +
8804 8804 ptob(svd->anon_index));
8805 8805 preclaim_callback = shamp_reclaim;
8806 8806 } else {
8807 8807 pamp = NULL;
8808 8808 paddr = lpgaddr;
8809 8809 preclaim_callback = segvn_reclaim;
8810 8810 }
8811 8811
8812 8812 if (type == L_PAGEUNLOCK) {
8813 8813 VM_STAT_ADD(segvnvmstats.pagelock[0]);
8814 8814
8815 8815 /*
8816 8816 * update hat ref bits for /proc. We need to make sure
8817 8817 * that threads tracing the ref and mod bits of the
8818 8818 * address space get the right data.
8819 8819 * Note: page ref and mod bits are updated at reclaim time
8820 8820 */
8821 8821 if (seg->s_as->a_vbits) {
8822 8822 for (a = addr; a < addr + len; a += PAGESIZE) {
8823 8823 if (rw == S_WRITE) {
8824 8824 hat_setstat(seg->s_as, a,
8825 8825 PAGESIZE, P_REF | P_MOD);
8826 8826 } else {
8827 8827 hat_setstat(seg->s_as, a,
8828 8828 PAGESIZE, P_REF);
8829 8829 }
8830 8830 }
8831 8831 }
8832 8832
8833 8833 /*
8834 8834 * Check the shadow list entry after the last page used in
8835 8835 * this IO request. If it's NOPCACHE_SHWLIST the shadow list
8836 8836 * was not inserted into pcache and is not large page
8837 8837 * adjusted. In this case call reclaim callback directly and
8838 8838 * don't adjust the shadow list start and size for large
8839 8839 * pages.
8840 8840 */
8841 8841 npages = btop(len);
8842 8842 if ((*ppp)[npages] == NOPCACHE_SHWLIST) {
8843 8843 void *ptag;
8844 8844 if (pamp != NULL) {
8845 8845 ASSERT(svd->type == MAP_SHARED);
8846 8846 ptag = (void *)pamp;
8847 8847 paddr = (caddr_t)((addr - seg->s_base) +
8848 8848 ptob(svd->anon_index));
8849 8849 } else {
8850 8850 ptag = (void *)seg;
8851 8851 paddr = addr;
8852 8852 }
8853 8853 (*preclaim_callback)(ptag, paddr, len, *ppp, rw, 0);
8854 8854 } else {
8855 8855 ASSERT((*ppp)[npages] == PCACHE_SHWLIST ||
8856 8856 IS_SWAPFSVP((*ppp)[npages]->p_vnode));
8857 8857 len = lpgeaddr - lpgaddr;
8858 8858 npages = btop(len);
8859 8859 seg_pinactive(seg, pamp, paddr, len,
8860 8860 *ppp - adjustpages, rw, pflags, preclaim_callback);
8861 8861 }
8862 8862
8863 8863 if (pamp != NULL) {
8864 8864 ASSERT(svd->type == MAP_SHARED);
8865 8865 ASSERT(svd->softlockcnt >= npages);
8866 8866 atomic_add_long((ulong_t *)&svd->softlockcnt, -npages);
8867 8867 }
8868 8868
8869 8869 if (sftlck_sbase) {
8870 8870 ASSERT(svd->softlockcnt_sbase > 0);
8871 8871 atomic_dec_ulong((ulong_t *)&svd->softlockcnt_sbase);
8872 8872 }
8873 8873 if (sftlck_send) {
8874 8874 ASSERT(svd->softlockcnt_send > 0);
8875 8875 atomic_dec_ulong((ulong_t *)&svd->softlockcnt_send);
8876 8876 }
8877 8877
8878 8878 /*
8879 8879 * If someone is blocked while unmapping, we purge
8880 8880 * segment page cache and thus reclaim pplist synchronously
8881 8881 * without waiting for seg_pasync_thread. This speeds up
8882 8882 * unmapping in cases where munmap(2) is called, while
8883 8883 * raw async i/o is still in progress or where a thread
8884 8884 * exits on data fault in a multithreaded application.
8885 8885 */
8886 8886 if (AS_ISUNMAPWAIT(seg->s_as)) {
8887 8887 if (svd->softlockcnt == 0) {
8888 8888 mutex_enter(&seg->s_as->a_contents);
8889 8889 if (AS_ISUNMAPWAIT(seg->s_as)) {
8890 8890 AS_CLRUNMAPWAIT(seg->s_as);
8891 8891 cv_broadcast(&seg->s_as->a_cv);
8892 8892 }
8893 8893 mutex_exit(&seg->s_as->a_contents);
8894 8894 } else if (pamp == NULL) {
8895 8895 /*
8896 8896 * softlockcnt is not 0 and this is a
8897 8897 * MAP_PRIVATE segment. Try to purge its
8898 8898 * pcache entries to reduce softlockcnt.
8899 8899 * If it drops to 0 segvn_reclaim()
8900 8900 * will wake up a thread waiting on
8901 8901 * unmapwait flag.
8902 8902 *
8903 8903 * We don't purge MAP_SHARED segments with non
8904 8904 * 0 softlockcnt since IO is still in progress
8905 8905 * for such segments.
8906 8906 */
8907 8907 ASSERT(svd->type == MAP_PRIVATE);
8908 8908 segvn_purge(seg);
8909 8909 }
8910 8910 }
8911 8911 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
8912 8912 TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_UNLOCK_END,
8913 8913 "segvn_pagelock: unlock seg %p addr %p", seg, addr);
8914 8914 return (0);
8915 8915 }
8916 8916
8917 8917 /* The L_PAGELOCK case ... */
8918 8918
8919 8919 VM_STAT_ADD(segvnvmstats.pagelock[1]);
8920 8920
8921 8921 /*
8922 8922 * For MAP_SHARED segments we have to check protections before
8923 8923 * seg_plookup() since pcache entries may be shared by many segments
8924 8924 * with potentially different page protections.
8925 8925 */
8926 8926 if (pamp != NULL) {
8927 8927 ASSERT(svd->type == MAP_SHARED);
8928 8928 if (svd->pageprot == 0) {
8929 8929 if ((svd->prot & protchk) == 0) {
8930 8930 error = EACCES;
8931 8931 goto out;
8932 8932 }
8933 8933 } else {
8934 8934 /*
8935 8935 * check page protections
8936 8936 */
8937 8937 caddr_t ea;
8938 8938
8939 8939 if (seg->s_szc) {
8940 8940 a = lpgaddr;
8941 8941 ea = lpgeaddr;
8942 8942 } else {
8943 8943 a = addr;
8944 8944 ea = addr + len;
8945 8945 }
8946 8946 for (; a < ea; a += pgsz) {
8947 8947 struct vpage *vp;
8948 8948
8949 8949 ASSERT(seg->s_szc == 0 ||
8950 8950 sameprot(seg, a, pgsz));
8951 8951 vp = &svd->vpage[seg_page(seg, a)];
8952 8952 if ((VPP_PROT(vp) & protchk) == 0) {
8953 8953 error = EACCES;
8954 8954 goto out;
8955 8955 }
8956 8956 }
8957 8957 }
8958 8958 }
8959 8959
8960 8960 /*
8961 8961 * try to find pages in segment page cache
8962 8962 */
8963 8963 pplist = seg_plookup(seg, pamp, paddr, lpgeaddr - lpgaddr, rw, pflags);
8964 8964 if (pplist != NULL) {
8965 8965 if (pamp != NULL) {
8966 8966 npages = btop((uintptr_t)(lpgeaddr - lpgaddr));
8967 8967 ASSERT(svd->type == MAP_SHARED);
8968 8968 atomic_add_long((ulong_t *)&svd->softlockcnt,
8969 8969 npages);
8970 8970 }
8971 8971 if (sftlck_sbase) {
8972 8972 atomic_inc_ulong((ulong_t *)&svd->softlockcnt_sbase);
8973 8973 }
8974 8974 if (sftlck_send) {
8975 8975 atomic_inc_ulong((ulong_t *)&svd->softlockcnt_send);
8976 8976 }
8977 8977 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
8978 8978 *ppp = pplist + adjustpages;
8979 8979 TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_HIT_END,
8980 8980 "segvn_pagelock: cache hit seg %p addr %p", seg, addr);
8981 8981 return (0);
8982 8982 }
8983 8983
8984 8984 /*
8985 8985 * For MAP_SHARED segments we already verified above that segment
8986 8986 * protections allow this pagelock operation.
8987 8987 */
8988 8988 if (pamp == NULL) {
8989 8989 ASSERT(svd->type == MAP_PRIVATE);
8990 8990 if (svd->pageprot == 0) {
8991 8991 if ((svd->prot & protchk) == 0) {
8992 8992 error = EACCES;
8993 8993 goto out;
8994 8994 }
8995 8995 if (svd->prot & PROT_WRITE) {
8996 8996 wlen = lpgeaddr - lpgaddr;
8997 8997 } else {
8998 8998 wlen = 0;
8999 8999 ASSERT(rw == S_READ);
9000 9000 }
9001 9001 } else {
9002 9002 int wcont = 1;
9003 9003 /*
9004 9004 * check page protections
9005 9005 */
9006 9006 for (a = lpgaddr, wlen = 0; a < lpgeaddr; a += pgsz) {
9007 9007 struct vpage *vp;
9008 9008
9009 9009 ASSERT(seg->s_szc == 0 ||
9010 9010 sameprot(seg, a, pgsz));
9011 9011 vp = &svd->vpage[seg_page(seg, a)];
9012 9012 if ((VPP_PROT(vp) & protchk) == 0) {
9013 9013 error = EACCES;
9014 9014 goto out;
9015 9015 }
9016 9016 if (wcont && (VPP_PROT(vp) & PROT_WRITE)) {
9017 9017 wlen += pgsz;
9018 9018 } else {
9019 9019 wcont = 0;
9020 9020 ASSERT(rw == S_READ);
9021 9021 }
9022 9022 }
9023 9023 }
9024 9024 ASSERT(rw == S_READ || wlen == lpgeaddr - lpgaddr);
9025 9025 ASSERT(rw == S_WRITE || wlen <= lpgeaddr - lpgaddr);
9026 9026 }
9027 9027
9028 9028 /*
9029 9029 * Only build large page adjusted shadow list if we expect to insert
9030 9030 * it into pcache. For large enough pages it's a big overhead to
9031 9031 * create a shadow list of the entire large page. But this overhead
9032 9032 * should be amortized over repeated pcache hits on subsequent reuse
9033 9033 * of this shadow list (IO into any range within this shadow list will
9034 9034 * find it in pcache since we large page align the request for pcache
9035 9035 * lookups). pcache performance is improved with bigger shadow lists
9036 9036 * as it reduces the time to pcache the entire big segment and reduces
9037 9037 * pcache chain length.
9038 9038 */
9039 9039 if (seg_pinsert_check(seg, pamp, paddr,
9040 9040 lpgeaddr - lpgaddr, pflags) == SEGP_SUCCESS) {
9041 9041 addr = lpgaddr;
9042 9042 len = lpgeaddr - lpgaddr;
9043 9043 use_pcache = 1;
9044 9044 } else {
9045 9045 use_pcache = 0;
9046 9046 /*
9047 9047 * Since this entry will not be inserted into the pcache, we
9048 9048 * will not do any adjustments to the starting address or
9049 9049 * size of the memory to be locked.
9050 9050 */
9051 9051 adjustpages = 0;
9052 9052 }
9053 9053 npages = btop(len);
9054 9054
9055 9055 pplist = kmem_alloc(sizeof (page_t *) * (npages + 1), KM_SLEEP);
9056 9056 pl = pplist;
9057 9057 *ppp = pplist + adjustpages;
9058 9058 /*
9059 9059 * If use_pcache is 0 this shadow list is not large page adjusted.
9060 9060 * Record this info in the last entry of shadow array so that
9061 9061 * L_PAGEUNLOCK can determine if it should large page adjust the
9062 9062 * address range to find the real range that was locked.
9063 9063 */
9064 9064 pl[npages] = use_pcache ? PCACHE_SHWLIST : NOPCACHE_SHWLIST;
9065 9065
9066 9066 page = seg_page(seg, addr);
9067 9067 anon_index = svd->anon_index + page;
9068 9068
9069 9069 anlock = 0;
9070 9070 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
9071 9071 ASSERT(amp->a_szc >= seg->s_szc);
9072 9072 anpgcnt = page_get_pagecnt(amp->a_szc);
9073 9073 for (a = addr; a < addr + len; a += PAGESIZE, anon_index++) {
9074 9074 struct anon *ap;
9075 9075 struct vnode *vp;
9076 9076 u_offset_t off;
9077 9077
9078 9078 /*
9079 9079 * Lock and unlock anon array only once per large page.
9080 9080 * anon_array_enter() locks the root anon slot according to
9081 9081 * a_szc which can't change while anon map is locked. We lock
9082 9082 * anon the first time through this loop and each time we
9083 9083 * reach anon index that corresponds to a root of a large
9084 9084 * page.
9085 9085 */
9086 9086 if (a == addr || P2PHASE(anon_index, anpgcnt) == 0) {
9087 9087 ASSERT(anlock == 0);
9088 9088 anon_array_enter(amp, anon_index, &cookie);
9089 9089 anlock = 1;
9090 9090 }
9091 9091 ap = anon_get_ptr(amp->ahp, anon_index);
9092 9092
9093 9093 /*
9094 9094 * We must never use seg_pcache for COW pages
9095 9095 * because we might end up with original page still
9096 9096 * lying in seg_pcache even after private page is
9097 9097 * created. This leads to data corruption as
9098 9098 * aio_write refers to the page still in cache
9099 9099 * while all other accesses refer to the private
9100 9100 * page.
9101 9101 */
9102 9102 if (ap == NULL || ap->an_refcnt != 1) {
9103 9103 struct vpage *vpage;
9104 9104
9105 9105 if (seg->s_szc) {
9106 9106 error = EFAULT;
9107 9107 break;
9108 9108 }
9109 9109 if (svd->vpage != NULL) {
9110 9110 vpage = &svd->vpage[seg_page(seg, a)];
9111 9111 } else {
9112 9112 vpage = NULL;
9113 9113 }
9114 9114 ASSERT(anlock);
9115 9115 anon_array_exit(&cookie);
9116 9116 anlock = 0;
9117 9117 pp = NULL;
9118 9118 error = segvn_faultpage(seg->s_as->a_hat, seg, a, 0,
9119 9119 vpage, &pp, 0, F_INVAL, rw, 1);
9120 9120 if (error) {
9121 9121 error = fc_decode(error);
9122 9122 break;
9123 9123 }
9124 9124 anon_array_enter(amp, anon_index, &cookie);
9125 9125 anlock = 1;
9126 9126 ap = anon_get_ptr(amp->ahp, anon_index);
9127 9127 if (ap == NULL || ap->an_refcnt != 1) {
9128 9128 error = EFAULT;
9129 9129 break;
9130 9130 }
9131 9131 }
9132 9132 swap_xlate(ap, &vp, &off);
9133 9133 pp = page_lookup_nowait(vp, off, SE_SHARED);
9134 9134 if (pp == NULL) {
9135 9135 error = EFAULT;
9136 9136 break;
9137 9137 }
9138 9138 if (ap->an_pvp != NULL) {
9139 9139 anon_swap_free(ap, pp);
9140 9140 }
9141 9141 /*
9142 9142 * Unlock anon if this is the last slot in a large page.
9143 9143 */
9144 9144 if (P2PHASE(anon_index, anpgcnt) == anpgcnt - 1) {
9145 9145 ASSERT(anlock);
9146 9146 anon_array_exit(&cookie);
9147 9147 anlock = 0;
9148 9148 }
9149 9149 *pplist++ = pp;
9150 9150 }
9151 9151 if (anlock) { /* Ensure the lock is dropped */
9152 9152 anon_array_exit(&cookie);
9153 9153 }
9154 9154 ANON_LOCK_EXIT(&->a_rwlock);
9155 9155
9156 9156 if (a >= addr + len) {
9157 9157 atomic_add_long((ulong_t *)&svd->softlockcnt, npages);
9158 9158 if (pamp != NULL) {
9159 9159 ASSERT(svd->type == MAP_SHARED);
9160 9160 atomic_add_long((ulong_t *)&pamp->a_softlockcnt,
9161 9161 npages);
9162 9162 wlen = len;
9163 9163 }
9164 9164 if (sftlck_sbase) {
9165 9165 atomic_inc_ulong((ulong_t *)&svd->softlockcnt_sbase);
9166 9166 }
9167 9167 if (sftlck_send) {
9168 9168 atomic_inc_ulong((ulong_t *)&svd->softlockcnt_send);
9169 9169 }
9170 9170 if (use_pcache) {
9171 9171 (void) seg_pinsert(seg, pamp, paddr, len, wlen, pl,
9172 9172 rw, pflags, preclaim_callback);
9173 9173 }
9174 9174 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
9175 9175 TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_FILL_END,
9176 9176 "segvn_pagelock: cache fill seg %p addr %p", seg, addr);
9177 9177 return (0);
9178 9178 }
9179 9179
9180 9180 pplist = pl;
9181 9181 np = ((uintptr_t)(a - addr)) >> PAGESHIFT;
9182 9182 while (np > (uint_t)0) {
9183 9183 ASSERT(PAGE_LOCKED(*pplist));
9184 9184 page_unlock(*pplist);
9185 9185 np--;
9186 9186 pplist++;
9187 9187 }
9188 9188 kmem_free(pl, sizeof (page_t *) * (npages + 1));
9189 9189 out:
9190 9190 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
9191 9191 *ppp = NULL;
9192 9192 TRACE_2(TR_FAC_PHYSIO, TR_PHYSIO_SEGVN_MISS_END,
9193 9193 "segvn_pagelock: cache miss seg %p addr %p", seg, addr);
9194 9194 return (error);
9195 9195 }
9196 9196
9197 9197 /*
9198 9198 * purge any cached pages in the I/O page cache
9199 9199 */
9200 9200 static void
9201 9201 segvn_purge(struct seg *seg)
9202 9202 {
9203 9203 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
9204 9204
9205 9205 /*
9206 9206 * pcache is only used by pure anon segments.
9207 9207 */
9208 9208 if (svd->amp == NULL || svd->vp != NULL) {
9209 9209 return;
9210 9210 }
9211 9211
9212 9212 /*
9213 9213 * For MAP_SHARED segments non 0 segment's softlockcnt means
9214 9214 * active IO is still in progress via this segment. So we only
9215 9215 * purge MAP_SHARED segments when their softlockcnt is 0.
9216 9216 */
9217 9217 if (svd->type == MAP_PRIVATE) {
9218 9218 if (svd->softlockcnt) {
9219 9219 seg_ppurge(seg, NULL, 0);
9220 9220 }
9221 9221 } else if (svd->softlockcnt == 0 && svd->amp->a_softlockcnt != 0) {
9222 9222 seg_ppurge(seg, svd->amp, 0);
9223 9223 }
9224 9224 }
9225 9225
9226 9226 /*
9227 9227 * If async argument is not 0 we are called from pcache async thread and don't
9228 9228 * hold AS lock.
9229 9229 */
9230 9230
9231 9231 /*ARGSUSED*/
9232 9232 static int
9233 9233 segvn_reclaim(void *ptag, caddr_t addr, size_t len, struct page **pplist,
9234 9234 enum seg_rw rw, int async)
9235 9235 {
9236 9236 struct seg *seg = (struct seg *)ptag;
9237 9237 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
9238 9238 pgcnt_t np, npages;
9239 9239 struct page **pl;
9240 9240
9241 9241 npages = np = btop(len);
9242 9242 ASSERT(npages);
9243 9243
9244 9244 ASSERT(svd->vp == NULL && svd->amp != NULL);
9245 9245 ASSERT(svd->softlockcnt >= npages);
9246 9246 ASSERT(async || AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
9247 9247
9248 9248 pl = pplist;
9249 9249
9250 9250 ASSERT(pl[np] == NOPCACHE_SHWLIST || pl[np] == PCACHE_SHWLIST);
9251 9251 ASSERT(!async || pl[np] == PCACHE_SHWLIST);
9252 9252
9253 9253 while (np > (uint_t)0) {
9254 9254 if (rw == S_WRITE) {
9255 9255 hat_setrefmod(*pplist);
9256 9256 } else {
9257 9257 hat_setref(*pplist);
9258 9258 }
9259 9259 page_unlock(*pplist);
9260 9260 np--;
9261 9261 pplist++;
9262 9262 }
9263 9263
9264 9264 kmem_free(pl, sizeof (page_t *) * (npages + 1));
9265 9265
9266 9266 /*
9267 9267 * If we are pcache async thread we don't hold AS lock. This means if
9268 9268 * softlockcnt drops to 0 after the decrement below address space may
9269 9269 * get freed. We can't allow it since after softlock derement to 0 we
9270 9270 * still need to access as structure for possible wakeup of unmap
9271 9271 * waiters. To prevent the disappearance of as we take this segment
9272 9272 * segfree_syncmtx. segvn_free() also takes this mutex as a barrier to
9273 9273 * make sure this routine completes before segment is freed.
9274 9274 *
9275 9275 * The second complication we have to deal with in async case is a
9276 9276 * possibility of missed wake up of unmap wait thread. When we don't
9277 9277 * hold as lock here we may take a_contents lock before unmap wait
9278 9278 * thread that was first to see softlockcnt was still not 0. As a
9279 9279 * result we'll fail to wake up an unmap wait thread. To avoid this
9280 9280 * race we set nounmapwait flag in as structure if we drop softlockcnt
9281 9281 * to 0 when we were called by pcache async thread. unmapwait thread
9282 9282 * will not block if this flag is set.
9283 9283 */
9284 9284 if (async) {
9285 9285 mutex_enter(&svd->segfree_syncmtx);
9286 9286 }
9287 9287
9288 9288 if (!atomic_add_long_nv((ulong_t *)&svd->softlockcnt, -npages)) {
9289 9289 if (async || AS_ISUNMAPWAIT(seg->s_as)) {
9290 9290 mutex_enter(&seg->s_as->a_contents);
9291 9291 if (async) {
9292 9292 AS_SETNOUNMAPWAIT(seg->s_as);
9293 9293 }
9294 9294 if (AS_ISUNMAPWAIT(seg->s_as)) {
9295 9295 AS_CLRUNMAPWAIT(seg->s_as);
9296 9296 cv_broadcast(&seg->s_as->a_cv);
9297 9297 }
9298 9298 mutex_exit(&seg->s_as->a_contents);
9299 9299 }
9300 9300 }
9301 9301
9302 9302 if (async) {
9303 9303 mutex_exit(&svd->segfree_syncmtx);
9304 9304 }
9305 9305 return (0);
9306 9306 }
9307 9307
9308 9308 /*ARGSUSED*/
9309 9309 static int
9310 9310 shamp_reclaim(void *ptag, caddr_t addr, size_t len, struct page **pplist,
9311 9311 enum seg_rw rw, int async)
9312 9312 {
9313 9313 amp_t *amp = (amp_t *)ptag;
9314 9314 pgcnt_t np, npages;
9315 9315 struct page **pl;
9316 9316
9317 9317 npages = np = btop(len);
9318 9318 ASSERT(npages);
9319 9319 ASSERT(amp->a_softlockcnt >= npages);
9320 9320
9321 9321 pl = pplist;
9322 9322
9323 9323 ASSERT(pl[np] == NOPCACHE_SHWLIST || pl[np] == PCACHE_SHWLIST);
9324 9324 ASSERT(!async || pl[np] == PCACHE_SHWLIST);
9325 9325
9326 9326 while (np > (uint_t)0) {
9327 9327 if (rw == S_WRITE) {
9328 9328 hat_setrefmod(*pplist);
9329 9329 } else {
9330 9330 hat_setref(*pplist);
9331 9331 }
9332 9332 page_unlock(*pplist);
9333 9333 np--;
9334 9334 pplist++;
9335 9335 }
9336 9336
9337 9337 kmem_free(pl, sizeof (page_t *) * (npages + 1));
9338 9338
9339 9339 /*
9340 9340 * If somebody sleeps in anonmap_purge() wake them up if a_softlockcnt
9341 9341 * drops to 0. anon map can't be freed until a_softlockcnt drops to 0
9342 9342 * and anonmap_purge() acquires a_purgemtx.
9343 9343 */
9344 9344 mutex_enter(&->a_purgemtx);
9345 9345 if (!atomic_add_long_nv((ulong_t *)&->a_softlockcnt, -npages) &&
9346 9346 amp->a_purgewait) {
9347 9347 amp->a_purgewait = 0;
9348 9348 cv_broadcast(&->a_purgecv);
9349 9349 }
9350 9350 mutex_exit(&->a_purgemtx);
9351 9351 return (0);
9352 9352 }
9353 9353
9354 9354 /*
9355 9355 * get a memory ID for an addr in a given segment
9356 9356 *
9357 9357 * XXX only creates PAGESIZE pages if anon slots are not initialized.
9358 9358 * At fault time they will be relocated into larger pages.
9359 9359 */
9360 9360 static int
9361 9361 segvn_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp)
9362 9362 {
9363 9363 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
9364 9364 struct anon *ap = NULL;
9365 9365 ulong_t anon_index;
9366 9366 struct anon_map *amp;
9367 9367 anon_sync_obj_t cookie;
9368 9368
9369 9369 if (svd->type == MAP_PRIVATE) {
9370 9370 memidp->val[0] = (uintptr_t)seg->s_as;
9371 9371 memidp->val[1] = (uintptr_t)addr;
9372 9372 return (0);
9373 9373 }
9374 9374
9375 9375 if (svd->type == MAP_SHARED) {
9376 9376 if (svd->vp) {
9377 9377 memidp->val[0] = (uintptr_t)svd->vp;
9378 9378 memidp->val[1] = (u_longlong_t)svd->offset +
9379 9379 (uintptr_t)(addr - seg->s_base);
9380 9380 return (0);
9381 9381 } else {
9382 9382
9383 9383 SEGVN_LOCK_ENTER(seg->s_as, &svd->lock, RW_READER);
9384 9384 if ((amp = svd->amp) != NULL) {
9385 9385 anon_index = svd->anon_index +
9386 9386 seg_page(seg, addr);
9387 9387 }
9388 9388 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
9389 9389
9390 9390 ASSERT(amp != NULL);
9391 9391
9392 9392 ANON_LOCK_ENTER(&->a_rwlock, RW_READER);
9393 9393 anon_array_enter(amp, anon_index, &cookie);
9394 9394 ap = anon_get_ptr(amp->ahp, anon_index);
9395 9395 if (ap == NULL) {
9396 9396 page_t *pp;
9397 9397
9398 9398 pp = anon_zero(seg, addr, &ap, svd->cred);
9399 9399 if (pp == NULL) {
9400 9400 anon_array_exit(&cookie);
9401 9401 ANON_LOCK_EXIT(&->a_rwlock);
9402 9402 return (ENOMEM);
9403 9403 }
9404 9404 ASSERT(anon_get_ptr(amp->ahp, anon_index)
9405 9405 == NULL);
9406 9406 (void) anon_set_ptr(amp->ahp, anon_index,
9407 9407 ap, ANON_SLEEP);
9408 9408 page_unlock(pp);
9409 9409 }
9410 9410
9411 9411 anon_array_exit(&cookie);
9412 9412 ANON_LOCK_EXIT(&->a_rwlock);
9413 9413
9414 9414 memidp->val[0] = (uintptr_t)ap;
9415 9415 memidp->val[1] = (uintptr_t)addr & PAGEOFFSET;
9416 9416 return (0);
9417 9417 }
9418 9418 }
9419 9419 return (EINVAL);
9420 9420 }
9421 9421
9422 9422 static int
9423 9423 sameprot(struct seg *seg, caddr_t a, size_t len)
9424 9424 {
9425 9425 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
9426 9426 struct vpage *vpage;
9427 9427 spgcnt_t pages = btop(len);
9428 9428 uint_t prot;
9429 9429
9430 9430 if (svd->pageprot == 0)
9431 9431 return (1);
9432 9432
9433 9433 ASSERT(svd->vpage != NULL);
9434 9434
9435 9435 vpage = &svd->vpage[seg_page(seg, a)];
9436 9436 prot = VPP_PROT(vpage);
9437 9437 vpage++;
9438 9438 pages--;
9439 9439 while (pages-- > 0) {
9440 9440 if (prot != VPP_PROT(vpage))
9441 9441 return (0);
9442 9442 vpage++;
9443 9443 }
9444 9444 return (1);
9445 9445 }
9446 9446
9447 9447 /*
9448 9448 * Get memory allocation policy info for specified address in given segment
9449 9449 */
9450 9450 static lgrp_mem_policy_info_t *
9451 9451 segvn_getpolicy(struct seg *seg, caddr_t addr)
9452 9452 {
9453 9453 struct anon_map *amp;
9454 9454 ulong_t anon_index;
9455 9455 lgrp_mem_policy_info_t *policy_info;
9456 9456 struct segvn_data *svn_data;
9457 9457 u_offset_t vn_off;
9458 9458 vnode_t *vp;
9459 9459
9460 9460 ASSERT(seg != NULL);
9461 9461
9462 9462 svn_data = (struct segvn_data *)seg->s_data;
9463 9463 if (svn_data == NULL)
9464 9464 return (NULL);
9465 9465
9466 9466 /*
9467 9467 * Get policy info for private or shared memory
9468 9468 */
9469 9469 if (svn_data->type != MAP_SHARED) {
9470 9470 if (svn_data->tr_state != SEGVN_TR_ON) {
9471 9471 policy_info = &svn_data->policy_info;
9472 9472 } else {
9473 9473 policy_info = &svn_data->tr_policy_info;
9474 9474 ASSERT(policy_info->mem_policy ==
9475 9475 LGRP_MEM_POLICY_NEXT_SEG);
9476 9476 }
9477 9477 } else {
9478 9478 amp = svn_data->amp;
9479 9479 anon_index = svn_data->anon_index + seg_page(seg, addr);
9480 9480 vp = svn_data->vp;
9481 9481 vn_off = svn_data->offset + (uintptr_t)(addr - seg->s_base);
9482 9482 policy_info = lgrp_shm_policy_get(amp, anon_index, vp, vn_off);
9483 9483 }
9484 9484
9485 9485 return (policy_info);
9486 9486 }
9487 9487
9488 9488 /*ARGSUSED*/
9489 9489 static int
9490 9490 segvn_capable(struct seg *seg, segcapability_t capability)
9491 9491 {
9492 9492 return (0);
9493 9493 }
9494 9494
9495 9495 /*
9496 9496 * Bind text vnode segment to an amp. If we bind successfully mappings will be
9497 9497 * established to per vnode mapping per lgroup amp pages instead of to vnode
9498 9498 * pages. There's one amp per vnode text mapping per lgroup. Many processes
9499 9499 * may share the same text replication amp. If a suitable amp doesn't already
9500 9500 * exist in svntr hash table create a new one. We may fail to bind to amp if
9501 9501 * segment is not eligible for text replication. Code below first checks for
9502 9502 * these conditions. If binding is successful segment tr_state is set to on
9503 9503 * and svd->amp points to the amp to use. Otherwise tr_state is set to off and
9504 9504 * svd->amp remains as NULL.
9505 9505 */
9506 9506 static void
9507 9507 segvn_textrepl(struct seg *seg)
9508 9508 {
9509 9509 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
9510 9510 vnode_t *vp = svd->vp;
9511 9511 u_offset_t off = svd->offset;
9512 9512 size_t size = seg->s_size;
9513 9513 u_offset_t eoff = off + size;
9514 9514 uint_t szc = seg->s_szc;
9515 9515 ulong_t hash = SVNTR_HASH_FUNC(vp);
9516 9516 svntr_t *svntrp;
9517 9517 struct vattr va;
9518 9518 proc_t *p = seg->s_as->a_proc;
9519 9519 lgrp_id_t lgrp_id;
9520 9520 lgrp_id_t olid;
9521 9521 int first;
9522 9522 struct anon_map *amp;
9523 9523
9524 9524 ASSERT(AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
9525 9525 ASSERT(SEGVN_WRITE_HELD(seg->s_as, &svd->lock));
9526 9526 ASSERT(p != NULL);
9527 9527 ASSERT(svd->tr_state == SEGVN_TR_INIT);
9528 9528 ASSERT(!HAT_IS_REGION_COOKIE_VALID(svd->rcookie));
9529 9529 ASSERT(svd->flags & MAP_TEXT);
9530 9530 ASSERT(svd->type == MAP_PRIVATE);
9531 9531 ASSERT(vp != NULL && svd->amp == NULL);
9532 9532 ASSERT(!svd->pageprot && !(svd->prot & PROT_WRITE));
9533 9533 ASSERT(!(svd->flags & MAP_NORESERVE) && svd->swresv == 0);
9534 9534 ASSERT(seg->s_as != &kas);
9535 9535 ASSERT(off < eoff);
9536 9536 ASSERT(svntr_hashtab != NULL);
9537 9537
9538 9538 /*
9539 9539 * If numa optimizations are no longer desired bail out.
9540 9540 */
9541 9541 if (!lgrp_optimizations()) {
9542 9542 svd->tr_state = SEGVN_TR_OFF;
9543 9543 return;
9544 9544 }
9545 9545
9546 9546 /*
9547 9547 * Avoid creating anon maps with size bigger than the file size.
9548 9548 * If VOP_GETATTR() call fails bail out.
9549 9549 */
9550 9550 va.va_mask = AT_SIZE | AT_MTIME | AT_CTIME;
9551 9551 if (VOP_GETATTR(vp, &va, 0, svd->cred, NULL) != 0) {
9552 9552 svd->tr_state = SEGVN_TR_OFF;
9553 9553 SEGVN_TR_ADDSTAT(gaerr);
9554 9554 return;
9555 9555 }
9556 9556 if (btopr(va.va_size) < btopr(eoff)) {
9557 9557 svd->tr_state = SEGVN_TR_OFF;
9558 9558 SEGVN_TR_ADDSTAT(overmap);
9559 9559 return;
9560 9560 }
9561 9561
9562 9562 /*
9563 9563 * VVMEXEC may not be set yet if exec() prefaults text segment. Set
9564 9564 * this flag now before vn_is_mapped(V_WRITE) so that MAP_SHARED
9565 9565 * mapping that checks if trcache for this vnode needs to be
9566 9566 * invalidated can't miss us.
9567 9567 */
9568 9568 if (!(vp->v_flag & VVMEXEC)) {
9569 9569 mutex_enter(&vp->v_lock);
9570 9570 vp->v_flag |= VVMEXEC;
9571 9571 mutex_exit(&vp->v_lock);
9572 9572 }
9573 9573 mutex_enter(&svntr_hashtab[hash].tr_lock);
9574 9574 /*
9575 9575 * Bail out if potentially MAP_SHARED writable mappings exist to this
9576 9576 * vnode. We don't want to use old file contents from existing
9577 9577 * replicas if this mapping was established after the original file
9578 9578 * was changed.
9579 9579 */
9580 9580 if (vn_is_mapped(vp, V_WRITE)) {
9581 9581 mutex_exit(&svntr_hashtab[hash].tr_lock);
9582 9582 svd->tr_state = SEGVN_TR_OFF;
9583 9583 SEGVN_TR_ADDSTAT(wrcnt);
9584 9584 return;
9585 9585 }
9586 9586 svntrp = svntr_hashtab[hash].tr_head;
9587 9587 for (; svntrp != NULL; svntrp = svntrp->tr_next) {
9588 9588 ASSERT(svntrp->tr_refcnt != 0);
9589 9589 if (svntrp->tr_vp != vp) {
9590 9590 continue;
9591 9591 }
9592 9592
9593 9593 /*
9594 9594 * Bail out if the file or its attributes were changed after
9595 9595 * this replication entry was created since we need to use the
9596 9596 * latest file contents. Note that mtime test alone is not
9597 9597 * sufficient because a user can explicitly change mtime via
9598 9598 * utimes(2) interfaces back to the old value after modifiying
9599 9599 * the file contents. To detect this case we also have to test
9600 9600 * ctime which among other things records the time of the last
9601 9601 * mtime change by utimes(2). ctime is not changed when the file
9602 9602 * is only read or executed so we expect that typically existing
9603 9603 * replication amp's can be used most of the time.
9604 9604 */
9605 9605 if (!svntrp->tr_valid ||
9606 9606 svntrp->tr_mtime.tv_sec != va.va_mtime.tv_sec ||
9607 9607 svntrp->tr_mtime.tv_nsec != va.va_mtime.tv_nsec ||
9608 9608 svntrp->tr_ctime.tv_sec != va.va_ctime.tv_sec ||
9609 9609 svntrp->tr_ctime.tv_nsec != va.va_ctime.tv_nsec) {
9610 9610 mutex_exit(&svntr_hashtab[hash].tr_lock);
9611 9611 svd->tr_state = SEGVN_TR_OFF;
9612 9612 SEGVN_TR_ADDSTAT(stale);
9613 9613 return;
9614 9614 }
9615 9615 /*
9616 9616 * if off, eoff and szc match current segment we found the
9617 9617 * existing entry we can use.
9618 9618 */
9619 9619 if (svntrp->tr_off == off && svntrp->tr_eoff == eoff &&
9620 9620 svntrp->tr_szc == szc) {
9621 9621 break;
9622 9622 }
9623 9623 /*
9624 9624 * Don't create different but overlapping in file offsets
9625 9625 * entries to avoid replication of the same file pages more
9626 9626 * than once per lgroup.
9627 9627 */
9628 9628 if ((off >= svntrp->tr_off && off < svntrp->tr_eoff) ||
9629 9629 (eoff > svntrp->tr_off && eoff <= svntrp->tr_eoff)) {
9630 9630 mutex_exit(&svntr_hashtab[hash].tr_lock);
9631 9631 svd->tr_state = SEGVN_TR_OFF;
9632 9632 SEGVN_TR_ADDSTAT(overlap);
9633 9633 return;
9634 9634 }
9635 9635 }
9636 9636 /*
9637 9637 * If we didn't find existing entry create a new one.
9638 9638 */
9639 9639 if (svntrp == NULL) {
9640 9640 svntrp = kmem_cache_alloc(svntr_cache, KM_NOSLEEP);
9641 9641 if (svntrp == NULL) {
9642 9642 mutex_exit(&svntr_hashtab[hash].tr_lock);
9643 9643 svd->tr_state = SEGVN_TR_OFF;
9644 9644 SEGVN_TR_ADDSTAT(nokmem);
9645 9645 return;
9646 9646 }
9647 9647 #ifdef DEBUG
9648 9648 {
9649 9649 lgrp_id_t i;
9650 9650 for (i = 0; i < NLGRPS_MAX; i++) {
9651 9651 ASSERT(svntrp->tr_amp[i] == NULL);
9652 9652 }
9653 9653 }
9654 9654 #endif /* DEBUG */
9655 9655 svntrp->tr_vp = vp;
9656 9656 svntrp->tr_off = off;
9657 9657 svntrp->tr_eoff = eoff;
9658 9658 svntrp->tr_szc = szc;
9659 9659 svntrp->tr_valid = 1;
9660 9660 svntrp->tr_mtime = va.va_mtime;
9661 9661 svntrp->tr_ctime = va.va_ctime;
9662 9662 svntrp->tr_refcnt = 0;
9663 9663 svntrp->tr_next = svntr_hashtab[hash].tr_head;
9664 9664 svntr_hashtab[hash].tr_head = svntrp;
9665 9665 }
9666 9666 first = 1;
9667 9667 again:
9668 9668 /*
9669 9669 * We want to pick a replica with pages on main thread's (t_tid = 1,
9670 9670 * aka T1) lgrp. Currently text replication is only optimized for
9671 9671 * workloads that either have all threads of a process on the same
9672 9672 * lgrp or execute their large text primarily on main thread.
9673 9673 */
9674 9674 lgrp_id = p->p_t1_lgrpid;
9675 9675 if (lgrp_id == LGRP_NONE) {
9676 9676 /*
9677 9677 * In case exec() prefaults text on non main thread use
9678 9678 * current thread lgrpid. It will become main thread anyway
9679 9679 * soon.
9680 9680 */
9681 9681 lgrp_id = lgrp_home_id(curthread);
9682 9682 }
9683 9683 /*
9684 9684 * Set p_tr_lgrpid to lgrpid if it hasn't been set yet. Otherwise
9685 9685 * just set it to NLGRPS_MAX if it's different from current process T1
9686 9686 * home lgrp. p_tr_lgrpid is used to detect if process uses text
9687 9687 * replication and T1 new home is different from lgrp used for text
9688 9688 * replication. When this happens asyncronous segvn thread rechecks if
9689 9689 * segments should change lgrps used for text replication. If we fail
9690 9690 * to set p_tr_lgrpid with atomic_cas_32 then set it to NLGRPS_MAX
9691 9691 * without cas if it's not already NLGRPS_MAX and not equal lgrp_id
9692 9692 * we want to use. We don't need to use cas in this case because
9693 9693 * another thread that races in between our non atomic check and set
9694 9694 * may only change p_tr_lgrpid to NLGRPS_MAX at this point.
9695 9695 */
9696 9696 ASSERT(lgrp_id != LGRP_NONE && lgrp_id < NLGRPS_MAX);
9697 9697 olid = p->p_tr_lgrpid;
9698 9698 if (lgrp_id != olid && olid != NLGRPS_MAX) {
9699 9699 lgrp_id_t nlid = (olid == LGRP_NONE) ? lgrp_id : NLGRPS_MAX;
9700 9700 if (atomic_cas_32((uint32_t *)&p->p_tr_lgrpid, olid, nlid) !=
9701 9701 olid) {
9702 9702 olid = p->p_tr_lgrpid;
9703 9703 ASSERT(olid != LGRP_NONE);
9704 9704 if (olid != lgrp_id && olid != NLGRPS_MAX) {
9705 9705 p->p_tr_lgrpid = NLGRPS_MAX;
9706 9706 }
9707 9707 }
9708 9708 ASSERT(p->p_tr_lgrpid != LGRP_NONE);
9709 9709 membar_producer();
9710 9710 /*
9711 9711 * lgrp_move_thread() won't schedule async recheck after
9712 9712 * p->p_t1_lgrpid update unless p->p_tr_lgrpid is not
9713 9713 * LGRP_NONE. Recheck p_t1_lgrpid once now that p->p_tr_lgrpid
9714 9714 * is not LGRP_NONE.
9715 9715 */
9716 9716 if (first && p->p_t1_lgrpid != LGRP_NONE &&
9717 9717 p->p_t1_lgrpid != lgrp_id) {
9718 9718 first = 0;
9719 9719 goto again;
9720 9720 }
9721 9721 }
9722 9722 /*
9723 9723 * If no amp was created yet for lgrp_id create a new one as long as
9724 9724 * we have enough memory to afford it.
9725 9725 */
9726 9726 if ((amp = svntrp->tr_amp[lgrp_id]) == NULL) {
9727 9727 size_t trmem = atomic_add_long_nv(&segvn_textrepl_bytes, size);
9728 9728 if (trmem > segvn_textrepl_max_bytes) {
9729 9729 SEGVN_TR_ADDSTAT(normem);
9730 9730 goto fail;
9731 9731 }
9732 9732 if (anon_try_resv_zone(size, NULL) == 0) {
9733 9733 SEGVN_TR_ADDSTAT(noanon);
9734 9734 goto fail;
9735 9735 }
9736 9736 amp = anonmap_alloc(size, size, ANON_NOSLEEP);
9737 9737 if (amp == NULL) {
9738 9738 anon_unresv_zone(size, NULL);
9739 9739 SEGVN_TR_ADDSTAT(nokmem);
9740 9740 goto fail;
9741 9741 }
9742 9742 ASSERT(amp->refcnt == 1);
9743 9743 amp->a_szc = szc;
9744 9744 svntrp->tr_amp[lgrp_id] = amp;
9745 9745 SEGVN_TR_ADDSTAT(newamp);
9746 9746 }
9747 9747 svntrp->tr_refcnt++;
9748 9748 ASSERT(svd->svn_trnext == NULL);
9749 9749 ASSERT(svd->svn_trprev == NULL);
9750 9750 svd->svn_trnext = svntrp->tr_svnhead;
9751 9751 svd->svn_trprev = NULL;
9752 9752 if (svntrp->tr_svnhead != NULL) {
9753 9753 svntrp->tr_svnhead->svn_trprev = svd;
9754 9754 }
9755 9755 svntrp->tr_svnhead = svd;
9756 9756 ASSERT(amp->a_szc == szc && amp->size == size && amp->swresv == size);
9757 9757 ASSERT(amp->refcnt >= 1);
9758 9758 svd->amp = amp;
9759 9759 svd->anon_index = 0;
9760 9760 svd->tr_policy_info.mem_policy = LGRP_MEM_POLICY_NEXT_SEG;
9761 9761 svd->tr_policy_info.mem_lgrpid = lgrp_id;
9762 9762 svd->tr_state = SEGVN_TR_ON;
9763 9763 mutex_exit(&svntr_hashtab[hash].tr_lock);
9764 9764 SEGVN_TR_ADDSTAT(repl);
9765 9765 return;
9766 9766 fail:
9767 9767 ASSERT(segvn_textrepl_bytes >= size);
9768 9768 atomic_add_long(&segvn_textrepl_bytes, -size);
9769 9769 ASSERT(svntrp != NULL);
9770 9770 ASSERT(svntrp->tr_amp[lgrp_id] == NULL);
9771 9771 if (svntrp->tr_refcnt == 0) {
9772 9772 ASSERT(svntrp == svntr_hashtab[hash].tr_head);
9773 9773 svntr_hashtab[hash].tr_head = svntrp->tr_next;
9774 9774 mutex_exit(&svntr_hashtab[hash].tr_lock);
9775 9775 kmem_cache_free(svntr_cache, svntrp);
9776 9776 } else {
9777 9777 mutex_exit(&svntr_hashtab[hash].tr_lock);
9778 9778 }
9779 9779 svd->tr_state = SEGVN_TR_OFF;
9780 9780 }
9781 9781
9782 9782 /*
9783 9783 * Convert seg back to regular vnode mapping seg by unbinding it from its text
9784 9784 * replication amp. This routine is most typically called when segment is
9785 9785 * unmapped but can also be called when segment no longer qualifies for text
9786 9786 * replication (e.g. due to protection changes). If unload_unmap is set use
9787 9787 * HAT_UNLOAD_UNMAP flag in hat_unload_callback(). If we are the last user of
9788 9788 * svntr free all its anon maps and remove it from the hash table.
9789 9789 */
9790 9790 static void
9791 9791 segvn_textunrepl(struct seg *seg, int unload_unmap)
9792 9792 {
9793 9793 struct segvn_data *svd = (struct segvn_data *)seg->s_data;
9794 9794 vnode_t *vp = svd->vp;
9795 9795 u_offset_t off = svd->offset;
9796 9796 size_t size = seg->s_size;
9797 9797 u_offset_t eoff = off + size;
9798 9798 uint_t szc = seg->s_szc;
9799 9799 ulong_t hash = SVNTR_HASH_FUNC(vp);
9800 9800 svntr_t *svntrp;
9801 9801 svntr_t **prv_svntrp;
9802 9802 lgrp_id_t lgrp_id = svd->tr_policy_info.mem_lgrpid;
9803 9803 lgrp_id_t i;
9804 9804
9805 9805 ASSERT(AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
9806 9806 ASSERT(AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock) ||
9807 9807 SEGVN_WRITE_HELD(seg->s_as, &svd->lock));
9808 9808 ASSERT(svd->tr_state == SEGVN_TR_ON);
9809 9809 ASSERT(!HAT_IS_REGION_COOKIE_VALID(svd->rcookie));
9810 9810 ASSERT(svd->amp != NULL);
9811 9811 ASSERT(svd->amp->refcnt >= 1);
9812 9812 ASSERT(svd->anon_index == 0);
9813 9813 ASSERT(lgrp_id != LGRP_NONE && lgrp_id < NLGRPS_MAX);
9814 9814 ASSERT(svntr_hashtab != NULL);
9815 9815
9816 9816 mutex_enter(&svntr_hashtab[hash].tr_lock);
9817 9817 prv_svntrp = &svntr_hashtab[hash].tr_head;
9818 9818 for (; (svntrp = *prv_svntrp) != NULL; prv_svntrp = &svntrp->tr_next) {
9819 9819 ASSERT(svntrp->tr_refcnt != 0);
9820 9820 if (svntrp->tr_vp == vp && svntrp->tr_off == off &&
9821 9821 svntrp->tr_eoff == eoff && svntrp->tr_szc == szc) {
9822 9822 break;
9823 9823 }
9824 9824 }
9825 9825 if (svntrp == NULL) {
9826 9826 panic("segvn_textunrepl: svntr record not found");
9827 9827 }
9828 9828 if (svntrp->tr_amp[lgrp_id] != svd->amp) {
9829 9829 panic("segvn_textunrepl: amp mismatch");
9830 9830 }
9831 9831 svd->tr_state = SEGVN_TR_OFF;
9832 9832 svd->amp = NULL;
9833 9833 if (svd->svn_trprev == NULL) {
9834 9834 ASSERT(svntrp->tr_svnhead == svd);
9835 9835 svntrp->tr_svnhead = svd->svn_trnext;
9836 9836 if (svntrp->tr_svnhead != NULL) {
9837 9837 svntrp->tr_svnhead->svn_trprev = NULL;
9838 9838 }
9839 9839 svd->svn_trnext = NULL;
9840 9840 } else {
9841 9841 svd->svn_trprev->svn_trnext = svd->svn_trnext;
9842 9842 if (svd->svn_trnext != NULL) {
9843 9843 svd->svn_trnext->svn_trprev = svd->svn_trprev;
9844 9844 svd->svn_trnext = NULL;
9845 9845 }
9846 9846 svd->svn_trprev = NULL;
9847 9847 }
9848 9848 if (--svntrp->tr_refcnt) {
9849 9849 mutex_exit(&svntr_hashtab[hash].tr_lock);
9850 9850 goto done;
9851 9851 }
9852 9852 *prv_svntrp = svntrp->tr_next;
9853 9853 mutex_exit(&svntr_hashtab[hash].tr_lock);
9854 9854 for (i = 0; i < NLGRPS_MAX; i++) {
9855 9855 struct anon_map *amp = svntrp->tr_amp[i];
9856 9856 if (amp == NULL) {
9857 9857 continue;
9858 9858 }
9859 9859 ASSERT(amp->refcnt == 1);
9860 9860 ASSERT(amp->swresv == size);
9861 9861 ASSERT(amp->size == size);
9862 9862 ASSERT(amp->a_szc == szc);
9863 9863 if (amp->a_szc != 0) {
9864 9864 anon_free_pages(amp->ahp, 0, size, szc);
9865 9865 } else {
9866 9866 anon_free(amp->ahp, 0, size);
9867 9867 }
9868 9868 svntrp->tr_amp[i] = NULL;
9869 9869 ASSERT(segvn_textrepl_bytes >= size);
9870 9870 atomic_add_long(&segvn_textrepl_bytes, -size);
9871 9871 anon_unresv_zone(amp->swresv, NULL);
9872 9872 amp->refcnt = 0;
9873 9873 anonmap_free(amp);
9874 9874 }
9875 9875 kmem_cache_free(svntr_cache, svntrp);
9876 9876 done:
9877 9877 hat_unload_callback(seg->s_as->a_hat, seg->s_base, size,
9878 9878 unload_unmap ? HAT_UNLOAD_UNMAP : 0, NULL);
9879 9879 }
9880 9880
9881 9881 /*
9882 9882 * This is called when a MAP_SHARED writable mapping is created to a vnode
9883 9883 * that is currently used for execution (VVMEXEC flag is set). In this case we
9884 9884 * need to prevent further use of existing replicas.
9885 9885 */
9886 9886 static void
9887 9887 segvn_inval_trcache(vnode_t *vp)
9888 9888 {
9889 9889 ulong_t hash = SVNTR_HASH_FUNC(vp);
9890 9890 svntr_t *svntrp;
9891 9891
9892 9892 ASSERT(vp->v_flag & VVMEXEC);
9893 9893
9894 9894 if (svntr_hashtab == NULL) {
9895 9895 return;
9896 9896 }
9897 9897
9898 9898 mutex_enter(&svntr_hashtab[hash].tr_lock);
9899 9899 svntrp = svntr_hashtab[hash].tr_head;
9900 9900 for (; svntrp != NULL; svntrp = svntrp->tr_next) {
9901 9901 ASSERT(svntrp->tr_refcnt != 0);
9902 9902 if (svntrp->tr_vp == vp && svntrp->tr_valid) {
9903 9903 svntrp->tr_valid = 0;
9904 9904 }
9905 9905 }
9906 9906 mutex_exit(&svntr_hashtab[hash].tr_lock);
9907 9907 }
9908 9908
9909 9909 static void
9910 9910 segvn_trasync_thread(void)
9911 9911 {
9912 9912 callb_cpr_t cpr_info;
9913 9913 kmutex_t cpr_lock; /* just for CPR stuff */
9914 9914
9915 9915 mutex_init(&cpr_lock, NULL, MUTEX_DEFAULT, NULL);
9916 9916
9917 9917 CALLB_CPR_INIT(&cpr_info, &cpr_lock,
9918 9918 callb_generic_cpr, "segvn_async");
9919 9919
9920 9920 if (segvn_update_textrepl_interval == 0) {
9921 9921 segvn_update_textrepl_interval = segvn_update_tr_time * hz;
9922 9922 } else {
9923 9923 segvn_update_textrepl_interval *= hz;
9924 9924 }
9925 9925 (void) timeout(segvn_trupdate_wakeup, NULL,
9926 9926 segvn_update_textrepl_interval);
9927 9927
9928 9928 for (;;) {
9929 9929 mutex_enter(&cpr_lock);
9930 9930 CALLB_CPR_SAFE_BEGIN(&cpr_info);
9931 9931 mutex_exit(&cpr_lock);
9932 9932 sema_p(&segvn_trasync_sem);
9933 9933 mutex_enter(&cpr_lock);
9934 9934 CALLB_CPR_SAFE_END(&cpr_info, &cpr_lock);
9935 9935 mutex_exit(&cpr_lock);
9936 9936 segvn_trupdate();
9937 9937 }
9938 9938 }
9939 9939
9940 9940 static uint64_t segvn_lgrp_trthr_migrs_snpsht = 0;
9941 9941
9942 9942 static void
9943 9943 segvn_trupdate_wakeup(void *dummy)
9944 9944 {
9945 9945 uint64_t cur_lgrp_trthr_migrs = lgrp_get_trthr_migrations();
9946 9946
9947 9947 if (cur_lgrp_trthr_migrs != segvn_lgrp_trthr_migrs_snpsht) {
9948 9948 segvn_lgrp_trthr_migrs_snpsht = cur_lgrp_trthr_migrs;
9949 9949 sema_v(&segvn_trasync_sem);
9950 9950 }
9951 9951
9952 9952 if (!segvn_disable_textrepl_update &&
9953 9953 segvn_update_textrepl_interval != 0) {
9954 9954 (void) timeout(segvn_trupdate_wakeup, dummy,
9955 9955 segvn_update_textrepl_interval);
9956 9956 }
9957 9957 }
9958 9958
9959 9959 static void
9960 9960 segvn_trupdate(void)
9961 9961 {
9962 9962 ulong_t hash;
9963 9963 svntr_t *svntrp;
9964 9964 segvn_data_t *svd;
9965 9965
9966 9966 ASSERT(svntr_hashtab != NULL);
9967 9967
9968 9968 for (hash = 0; hash < svntr_hashtab_sz; hash++) {
9969 9969 mutex_enter(&svntr_hashtab[hash].tr_lock);
9970 9970 svntrp = svntr_hashtab[hash].tr_head;
9971 9971 for (; svntrp != NULL; svntrp = svntrp->tr_next) {
9972 9972 ASSERT(svntrp->tr_refcnt != 0);
9973 9973 svd = svntrp->tr_svnhead;
9974 9974 for (; svd != NULL; svd = svd->svn_trnext) {
9975 9975 segvn_trupdate_seg(svd->seg, svd, svntrp,
9976 9976 hash);
9977 9977 }
9978 9978 }
9979 9979 mutex_exit(&svntr_hashtab[hash].tr_lock);
9980 9980 }
9981 9981 }
9982 9982
9983 9983 static void
9984 9984 segvn_trupdate_seg(struct seg *seg,
9985 9985 segvn_data_t *svd,
9986 9986 svntr_t *svntrp,
9987 9987 ulong_t hash)
9988 9988 {
9989 9989 proc_t *p;
9990 9990 lgrp_id_t lgrp_id;
9991 9991 struct as *as;
9992 9992 size_t size;
9993 9993 struct anon_map *amp;
9994 9994
9995 9995 ASSERT(svd->vp != NULL);
9996 9996 ASSERT(svd->vp == svntrp->tr_vp);
9997 9997 ASSERT(svd->offset == svntrp->tr_off);
9998 9998 ASSERT(svd->offset + seg->s_size == svntrp->tr_eoff);
9999 9999 ASSERT(seg != NULL);
10000 10000 ASSERT(svd->seg == seg);
10001 10001 ASSERT(seg->s_data == (void *)svd);
10002 10002 ASSERT(seg->s_szc == svntrp->tr_szc);
10003 10003 ASSERT(svd->tr_state == SEGVN_TR_ON);
10004 10004 ASSERT(!HAT_IS_REGION_COOKIE_VALID(svd->rcookie));
10005 10005 ASSERT(svd->amp != NULL);
10006 10006 ASSERT(svd->tr_policy_info.mem_policy == LGRP_MEM_POLICY_NEXT_SEG);
10007 10007 ASSERT(svd->tr_policy_info.mem_lgrpid != LGRP_NONE);
10008 10008 ASSERT(svd->tr_policy_info.mem_lgrpid < NLGRPS_MAX);
10009 10009 ASSERT(svntrp->tr_amp[svd->tr_policy_info.mem_lgrpid] == svd->amp);
10010 10010 ASSERT(svntrp->tr_refcnt != 0);
10011 10011 ASSERT(mutex_owned(&svntr_hashtab[hash].tr_lock));
10012 10012
10013 10013 as = seg->s_as;
10014 10014 ASSERT(as != NULL && as != &kas);
10015 10015 p = as->a_proc;
10016 10016 ASSERT(p != NULL);
10017 10017 ASSERT(p->p_tr_lgrpid != LGRP_NONE);
10018 10018 lgrp_id = p->p_t1_lgrpid;
10019 10019 if (lgrp_id == LGRP_NONE) {
10020 10020 return;
10021 10021 }
10022 10022 ASSERT(lgrp_id < NLGRPS_MAX);
10023 10023 if (svd->tr_policy_info.mem_lgrpid == lgrp_id) {
10024 10024 return;
10025 10025 }
10026 10026
10027 10027 /*
10028 10028 * Use tryenter locking since we are locking as/seg and svntr hash
10029 10029 * lock in reverse from syncrounous thread order.
10030 10030 */
10031 10031 if (!AS_LOCK_TRYENTER(as, &as->a_lock, RW_READER)) {
10032 10032 SEGVN_TR_ADDSTAT(nolock);
10033 10033 if (segvn_lgrp_trthr_migrs_snpsht) {
10034 10034 segvn_lgrp_trthr_migrs_snpsht = 0;
10035 10035 }
10036 10036 return;
10037 10037 }
10038 10038 if (!SEGVN_LOCK_TRYENTER(seg->s_as, &svd->lock, RW_WRITER)) {
10039 10039 AS_LOCK_EXIT(as, &as->a_lock);
10040 10040 SEGVN_TR_ADDSTAT(nolock);
10041 10041 if (segvn_lgrp_trthr_migrs_snpsht) {
10042 10042 segvn_lgrp_trthr_migrs_snpsht = 0;
10043 10043 }
10044 10044 return;
10045 10045 }
10046 10046 size = seg->s_size;
10047 10047 if (svntrp->tr_amp[lgrp_id] == NULL) {
10048 10048 size_t trmem = atomic_add_long_nv(&segvn_textrepl_bytes, size);
10049 10049 if (trmem > segvn_textrepl_max_bytes) {
10050 10050 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
10051 10051 AS_LOCK_EXIT(as, &as->a_lock);
10052 10052 atomic_add_long(&segvn_textrepl_bytes, -size);
10053 10053 SEGVN_TR_ADDSTAT(normem);
10054 10054 return;
10055 10055 }
10056 10056 if (anon_try_resv_zone(size, NULL) == 0) {
10057 10057 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
10058 10058 AS_LOCK_EXIT(as, &as->a_lock);
10059 10059 atomic_add_long(&segvn_textrepl_bytes, -size);
10060 10060 SEGVN_TR_ADDSTAT(noanon);
10061 10061 return;
10062 10062 }
10063 10063 amp = anonmap_alloc(size, size, KM_NOSLEEP);
10064 10064 if (amp == NULL) {
10065 10065 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
10066 10066 AS_LOCK_EXIT(as, &as->a_lock);
10067 10067 atomic_add_long(&segvn_textrepl_bytes, -size);
10068 10068 anon_unresv_zone(size, NULL);
10069 10069 SEGVN_TR_ADDSTAT(nokmem);
10070 10070 return;
10071 10071 }
10072 10072 ASSERT(amp->refcnt == 1);
10073 10073 amp->a_szc = seg->s_szc;
10074 10074 svntrp->tr_amp[lgrp_id] = amp;
10075 10075 }
10076 10076 /*
10077 10077 * We don't need to drop the bucket lock but here we give other
10078 10078 * threads a chance. svntr and svd can't be unlinked as long as
10079 10079 * segment lock is held as a writer and AS held as well. After we
10080 10080 * retake bucket lock we'll continue from where we left. We'll be able
10081 10081 * to reach the end of either list since new entries are always added
10082 10082 * to the beginning of the lists.
10083 10083 */
10084 10084 mutex_exit(&svntr_hashtab[hash].tr_lock);
10085 10085 hat_unload_callback(as->a_hat, seg->s_base, size, 0, NULL);
10086 10086 mutex_enter(&svntr_hashtab[hash].tr_lock);
10087 10087
10088 10088 ASSERT(svd->tr_state == SEGVN_TR_ON);
10089 10089 ASSERT(svd->amp != NULL);
10090 10090 ASSERT(svd->tr_policy_info.mem_policy == LGRP_MEM_POLICY_NEXT_SEG);
10091 10091 ASSERT(svd->tr_policy_info.mem_lgrpid != lgrp_id);
10092 10092 ASSERT(svd->amp != svntrp->tr_amp[lgrp_id]);
10093 10093
10094 10094 svd->tr_policy_info.mem_lgrpid = lgrp_id;
10095 10095 svd->amp = svntrp->tr_amp[lgrp_id];
10096 10096 p->p_tr_lgrpid = NLGRPS_MAX;
10097 10097 SEGVN_LOCK_EXIT(seg->s_as, &svd->lock);
10098 10098 AS_LOCK_EXIT(as, &as->a_lock);
10099 10099
10100 10100 ASSERT(svntrp->tr_refcnt != 0);
10101 10101 ASSERT(svd->vp == svntrp->tr_vp);
10102 10102 ASSERT(svd->tr_policy_info.mem_lgrpid == lgrp_id);
10103 10103 ASSERT(svd->amp != NULL && svd->amp == svntrp->tr_amp[lgrp_id]);
10104 10104 ASSERT(svd->seg == seg);
10105 10105 ASSERT(svd->tr_state == SEGVN_TR_ON);
10106 10106
10107 10107 SEGVN_TR_ADDSTAT(asyncrepl);
10108 10108 }
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