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use NULL getmemid segop as a shorthand for ENODEV
Instead of forcing every segment driver to implement a dummy function to
return (hopefully) ENODEV, handle NULL getmemid segop function pointer as
"return ENODEV" shorthand.
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--- old/usr/src/uts/sparc/v9/vm/seg_nf.c
+++ new/usr/src/uts/sparc/v9/vm/seg_nf.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 2006 Sun Microsystems, Inc. All rights reserved.
23 23 * Use is subject to license terms.
24 24 */
25 25
26 26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
27 27 /* All Rights Reserved */
28 28
29 29 /*
30 30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 31 * under license from the Regents of the University of California.
32 32 */
33 33
34 34 /*
35 35 * VM - segment for non-faulting loads.
36 36 */
37 37
38 38 #include <sys/types.h>
39 39 #include <sys/t_lock.h>
40 40 #include <sys/param.h>
41 41 #include <sys/mman.h>
42 42 #include <sys/errno.h>
43 43 #include <sys/kmem.h>
44 44 #include <sys/cmn_err.h>
45 45 #include <sys/vnode.h>
46 46 #include <sys/proc.h>
47 47 #include <sys/conf.h>
48 48 #include <sys/debug.h>
49 49 #include <sys/archsystm.h>
50 50 #include <sys/lgrp.h>
51 51
52 52 #include <vm/page.h>
53 53 #include <vm/hat.h>
54 54 #include <vm/as.h>
55 55 #include <vm/seg.h>
56 56 #include <vm/vpage.h>
57 57
58 58 /*
59 59 * Private seg op routines.
60 60 */
61 61 static int segnf_dup(struct seg *seg, struct seg *newseg);
62 62 static int segnf_unmap(struct seg *seg, caddr_t addr, size_t len);
63 63 static void segnf_free(struct seg *seg);
64 64 static faultcode_t segnf_nomap(void);
65 65 static int segnf_setprot(struct seg *seg, caddr_t addr,
66 66 size_t len, uint_t prot);
67 67 static int segnf_checkprot(struct seg *seg, caddr_t addr,
68 68 size_t len, uint_t prot);
69 69 static int segnf_nop(void);
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70 70 static int segnf_getprot(struct seg *seg, caddr_t addr,
71 71 size_t len, uint_t *protv);
72 72 static u_offset_t segnf_getoffset(struct seg *seg, caddr_t addr);
73 73 static int segnf_gettype(struct seg *seg, caddr_t addr);
74 74 static int segnf_getvp(struct seg *seg, caddr_t addr, struct vnode **vpp);
75 75 static void segnf_dump(struct seg *seg);
76 76 static int segnf_pagelock(struct seg *seg, caddr_t addr, size_t len,
77 77 struct page ***ppp, enum lock_type type, enum seg_rw rw);
78 78 static int segnf_setpagesize(struct seg *seg, caddr_t addr, size_t len,
79 79 uint_t szc);
80 -static int segnf_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp);
81 80
82 81
83 82 struct seg_ops segnf_ops = {
84 83 .dup = segnf_dup,
85 84 .unmap = segnf_unmap,
86 85 .free = segnf_free,
87 86 .fault = (faultcode_t (*)(struct hat *, struct seg *, caddr_t,
88 87 size_t, enum fault_type, enum seg_rw))segnf_nomap,
89 88 .faulta = (faultcode_t (*)(struct seg *, caddr_t)) segnf_nomap,
90 89 .setprot = segnf_setprot,
91 90 .checkprot = segnf_checkprot,
92 91 .sync = (int (*)(struct seg *, caddr_t, size_t, int, uint_t))
93 92 segnf_nop,
94 93 .incore = (size_t (*)(struct seg *, caddr_t, size_t, char *))
95 94 segnf_nop,
96 95 .lockop = (int (*)(struct seg *, caddr_t, size_t, int, int,
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97 96 ulong_t *, size_t))segnf_nop,
98 97 .getprot = segnf_getprot,
99 98 .getoffset = segnf_getoffset,
100 99 .gettype = segnf_gettype,
101 100 .getvp = segnf_getvp,
102 101 .advise = (int (*)(struct seg *, caddr_t, size_t, uint_t))
103 102 segnf_nop,
104 103 .dump = segnf_dump,
105 104 .pagelock = segnf_pagelock,
106 105 .setpagesize = segnf_setpagesize,
107 - .getmemid = segnf_getmemid,
108 106 };
109 107
110 108 /*
111 109 * vnode and page for the page of zeros we use for the nf mappings.
112 110 */
113 111 static kmutex_t segnf_lock;
114 112 static struct vnode nfvp;
115 113 static struct page **nfpp;
116 114
117 115 #define addr_to_vcolor(addr) \
118 116 (shm_alignment) ? \
119 117 ((int)(((uintptr_t)(addr) & (shm_alignment - 1)) >> PAGESHIFT)) : 0
120 118
121 119 /*
122 120 * We try to limit the number of Non-fault segments created.
123 121 * Non fault segments are created to optimize sparc V9 code which uses
124 122 * the sparc nonfaulting load ASI (ASI_PRIMARY_NOFAULT).
125 123 *
126 124 * There are several reasons why creating too many non-fault segments
127 125 * could cause problems.
128 126 *
129 127 * First, excessive allocation of kernel resources for the seg
130 128 * structures and the HAT data to map the zero pages.
131 129 *
132 130 * Secondly, creating nofault segments actually uses up user virtual
133 131 * address space. This makes it unavailable for subsequent mmap(0, ...)
134 132 * calls which use as_gap() to find empty va regions. Creation of too
135 133 * many nofault segments could thus interfere with the ability of the
136 134 * runtime linker to load a shared object.
137 135 */
138 136 #define MAXSEGFORNF (10000)
139 137 #define MAXNFSEARCH (5)
140 138
141 139
142 140 /*
143 141 * Must be called from startup()
144 142 */
145 143 void
146 144 segnf_init()
147 145 {
148 146 mutex_init(&segnf_lock, NULL, MUTEX_DEFAULT, NULL);
149 147 }
150 148
151 149
152 150 /*
153 151 * Create a no-fault segment.
154 152 *
155 153 * The no-fault segment is not technically necessary, as the code in
156 154 * nfload() in trap.c will emulate the SPARC instruction and load
157 155 * a value of zero in the destination register.
158 156 *
159 157 * However, this code tries to put a page of zero's at the nofault address
160 158 * so that subsequent non-faulting loads to the same page will not
161 159 * trap with a tlb miss.
162 160 *
163 161 * In order to help limit the number of segments we merge adjacent nofault
164 162 * segments into a single segment. If we get a large number of segments
165 163 * we'll also try to delete a random other nf segment.
166 164 */
167 165 /* ARGSUSED */
168 166 int
169 167 segnf_create(struct seg *seg, void *argsp)
170 168 {
171 169 uint_t prot;
172 170 pgcnt_t vacpgs;
173 171 u_offset_t off = 0;
174 172 caddr_t vaddr = NULL;
175 173 int i, color;
176 174 struct seg *s1;
177 175 struct seg *s2;
178 176 size_t size;
179 177 struct as *as = seg->s_as;
180 178
181 179 ASSERT(as && AS_WRITE_HELD(as, &as->a_lock));
182 180
183 181 /*
184 182 * Need a page per virtual color or just 1 if no vac.
185 183 */
186 184 mutex_enter(&segnf_lock);
187 185 if (nfpp == NULL) {
188 186 struct seg kseg;
189 187
190 188 vacpgs = 1;
191 189 if (shm_alignment > PAGESIZE) {
192 190 vacpgs = shm_alignment >> PAGESHIFT;
193 191 }
194 192
195 193 nfpp = kmem_alloc(sizeof (*nfpp) * vacpgs, KM_SLEEP);
196 194
197 195 kseg.s_as = &kas;
198 196 for (i = 0; i < vacpgs; i++, off += PAGESIZE,
199 197 vaddr += PAGESIZE) {
200 198 nfpp[i] = page_create_va(&nfvp, off, PAGESIZE,
201 199 PG_WAIT | PG_NORELOC, &kseg, vaddr);
202 200 page_io_unlock(nfpp[i]);
203 201 page_downgrade(nfpp[i]);
204 202 pagezero(nfpp[i], 0, PAGESIZE);
205 203 }
206 204 }
207 205 mutex_exit(&segnf_lock);
208 206
209 207 hat_map(as->a_hat, seg->s_base, seg->s_size, HAT_MAP);
210 208
211 209 /*
212 210 * s_data can't be NULL because of ASSERTS in the common vm code.
213 211 */
214 212 seg->s_ops = &segnf_ops;
215 213 seg->s_data = seg;
216 214 seg->s_flags |= S_PURGE;
217 215
218 216 mutex_enter(&as->a_contents);
219 217 as->a_flags |= AS_NEEDSPURGE;
220 218 mutex_exit(&as->a_contents);
221 219
222 220 prot = PROT_READ;
223 221 color = addr_to_vcolor(seg->s_base);
224 222 if (as != &kas)
225 223 prot |= PROT_USER;
226 224 hat_memload(as->a_hat, seg->s_base, nfpp[color],
227 225 prot | HAT_NOFAULT, HAT_LOAD);
228 226
229 227 /*
230 228 * At this point see if we can concatenate a segment to
231 229 * a non-fault segment immediately before and/or after it.
232 230 */
233 231 if ((s1 = AS_SEGPREV(as, seg)) != NULL &&
234 232 s1->s_ops == &segnf_ops &&
235 233 s1->s_base + s1->s_size == seg->s_base) {
236 234 size = s1->s_size;
237 235 seg_free(s1);
238 236 seg->s_base -= size;
239 237 seg->s_size += size;
240 238 }
241 239
242 240 if ((s2 = AS_SEGNEXT(as, seg)) != NULL &&
243 241 s2->s_ops == &segnf_ops &&
244 242 seg->s_base + seg->s_size == s2->s_base) {
245 243 size = s2->s_size;
246 244 seg_free(s2);
247 245 seg->s_size += size;
248 246 }
249 247
250 248 /*
251 249 * if we already have a lot of segments, try to delete some other
252 250 * nofault segment to reduce the probability of uncontrolled segment
253 251 * creation.
254 252 *
255 253 * the code looks around quickly (no more than MAXNFSEARCH segments
256 254 * each way) for another NF segment and then deletes it.
257 255 */
258 256 if (avl_numnodes(&as->a_segtree) > MAXSEGFORNF) {
259 257 size = 0;
260 258 s2 = NULL;
261 259 s1 = AS_SEGPREV(as, seg);
262 260 while (size++ < MAXNFSEARCH && s1 != NULL) {
263 261 if (s1->s_ops == &segnf_ops)
264 262 s2 = s1;
265 263 s1 = AS_SEGPREV(s1->s_as, seg);
266 264 }
267 265 if (s2 == NULL) {
268 266 s1 = AS_SEGNEXT(as, seg);
269 267 while (size-- > 0 && s1 != NULL) {
270 268 if (s1->s_ops == &segnf_ops)
271 269 s2 = s1;
272 270 s1 = AS_SEGNEXT(as, seg);
273 271 }
274 272 }
275 273 if (s2 != NULL)
276 274 seg_unmap(s2);
277 275 }
278 276
279 277 return (0);
280 278 }
281 279
282 280 /*
283 281 * Never really need "No fault" segments, so they aren't dup'd.
284 282 */
285 283 /* ARGSUSED */
286 284 static int
287 285 segnf_dup(struct seg *seg, struct seg *newseg)
288 286 {
289 287 panic("segnf_dup");
290 288 return (0);
291 289 }
292 290
293 291 /*
294 292 * Split a segment at addr for length len.
295 293 */
296 294 static int
297 295 segnf_unmap(struct seg *seg, caddr_t addr, size_t len)
298 296 {
299 297 ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
300 298
301 299 /*
302 300 * Check for bad sizes.
303 301 */
304 302 if (addr < seg->s_base || addr + len > seg->s_base + seg->s_size ||
305 303 (len & PAGEOFFSET) || ((uintptr_t)addr & PAGEOFFSET)) {
306 304 cmn_err(CE_PANIC, "segnf_unmap: bad unmap size");
307 305 }
308 306
309 307 /*
310 308 * Unload any hardware translations in the range to be taken out.
311 309 */
312 310 hat_unload(seg->s_as->a_hat, addr, len, HAT_UNLOAD_UNMAP);
313 311
314 312 if (addr == seg->s_base && len == seg->s_size) {
315 313 /*
316 314 * Freeing entire segment.
317 315 */
318 316 seg_free(seg);
319 317 } else if (addr == seg->s_base) {
320 318 /*
321 319 * Freeing the beginning of the segment.
322 320 */
323 321 seg->s_base += len;
324 322 seg->s_size -= len;
325 323 } else if (addr + len == seg->s_base + seg->s_size) {
326 324 /*
327 325 * Freeing the end of the segment.
328 326 */
329 327 seg->s_size -= len;
330 328 } else {
331 329 /*
332 330 * The section to go is in the middle of the segment, so we
333 331 * have to cut it into two segments. We shrink the existing
334 332 * "seg" at the low end, and create "nseg" for the high end.
335 333 */
336 334 caddr_t nbase = addr + len;
337 335 size_t nsize = (seg->s_base + seg->s_size) - nbase;
338 336 struct seg *nseg;
339 337
340 338 /*
341 339 * Trim down "seg" before trying to stick "nseg" into the as.
342 340 */
343 341 seg->s_size = addr - seg->s_base;
344 342 nseg = seg_alloc(seg->s_as, nbase, nsize);
345 343 if (nseg == NULL)
346 344 cmn_err(CE_PANIC, "segnf_unmap: seg_alloc failed");
347 345
348 346 /*
349 347 * s_data can't be NULL because of ASSERTs in common VM code.
350 348 */
351 349 nseg->s_ops = seg->s_ops;
352 350 nseg->s_data = nseg;
353 351 nseg->s_flags |= S_PURGE;
354 352 mutex_enter(&seg->s_as->a_contents);
355 353 seg->s_as->a_flags |= AS_NEEDSPURGE;
356 354 mutex_exit(&seg->s_as->a_contents);
357 355 }
358 356
359 357 return (0);
360 358 }
361 359
362 360 /*
363 361 * Free a segment.
364 362 */
365 363 static void
366 364 segnf_free(struct seg *seg)
367 365 {
368 366 ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
369 367 }
370 368
371 369 /*
372 370 * No faults allowed on segnf.
373 371 */
374 372 static faultcode_t
375 373 segnf_nomap(void)
376 374 {
377 375 return (FC_NOMAP);
378 376 }
379 377
380 378 /* ARGSUSED */
381 379 static int
382 380 segnf_setprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot)
383 381 {
384 382 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
385 383 return (EACCES);
386 384 }
387 385
388 386 /* ARGSUSED */
389 387 static int
390 388 segnf_checkprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot)
391 389 {
392 390 uint_t sprot;
393 391 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
394 392
395 393 sprot = seg->s_as == &kas ? PROT_READ : PROT_READ|PROT_USER;
396 394 return ((prot & sprot) == prot ? 0 : EACCES);
397 395 }
398 396
399 397 static int
400 398 segnf_nop(void)
401 399 {
402 400 return (0);
403 401 }
404 402
405 403 static int
406 404 segnf_getprot(struct seg *seg, caddr_t addr, size_t len, uint_t *protv)
407 405 {
408 406 size_t pgno = seg_page(seg, addr + len) - seg_page(seg, addr) + 1;
409 407 size_t p;
410 408 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
411 409
412 410 for (p = 0; p < pgno; ++p)
413 411 protv[p] = PROT_READ;
414 412 return (0);
415 413 }
416 414
417 415 /* ARGSUSED */
418 416 static u_offset_t
419 417 segnf_getoffset(struct seg *seg, caddr_t addr)
420 418 {
421 419 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
422 420
423 421 return ((u_offset_t)0);
424 422 }
425 423
426 424 /* ARGSUSED */
427 425 static int
428 426 segnf_gettype(struct seg *seg, caddr_t addr)
429 427 {
430 428 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
431 429
432 430 return (MAP_SHARED);
433 431 }
434 432
435 433 /* ARGSUSED */
436 434 static int
437 435 segnf_getvp(struct seg *seg, caddr_t addr, struct vnode **vpp)
438 436 {
439 437 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
440 438
441 439 *vpp = &nfvp;
442 440 return (0);
443 441 }
444 442
445 443 /*
446 444 * segnf pages are not dumped, so we just return
447 445 */
448 446 /* ARGSUSED */
449 447 static void
450 448 segnf_dump(struct seg *seg)
451 449 {}
452 450
453 451 /*ARGSUSED*/
454 452 static int
455 453 segnf_pagelock(struct seg *seg, caddr_t addr, size_t len,
456 454 struct page ***ppp, enum lock_type type, enum seg_rw rw)
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457 455 {
458 456 return (ENOTSUP);
459 457 }
460 458
461 459 /*ARGSUSED*/
462 460 static int
463 461 segnf_setpagesize(struct seg *seg, caddr_t addr, size_t len,
464 462 uint_t szc)
465 463 {
466 464 return (ENOTSUP);
467 -}
468 -
469 -/*ARGSUSED*/
470 -static int
471 -segnf_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp)
472 -{
473 - return (ENODEV);
474 465 }
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