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