Print this page
6144 use C99 initializers in segment ops structures
| Split |
Close |
| Expand all |
| Collapse all |
--- 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.
|
↓ open down ↓ |
23 lines elided |
↑ open up ↑ |
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 -#pragma ident "%Z%%M% %I% %E% SMI"
35 -
36 34 /*
37 35 * VM - segment for non-faulting loads.
38 36 */
39 37
40 38 #include <sys/types.h>
41 39 #include <sys/t_lock.h>
42 40 #include <sys/param.h>
43 41 #include <sys/mman.h>
44 42 #include <sys/errno.h>
45 43 #include <sys/kmem.h>
46 44 #include <sys/cmn_err.h>
47 45 #include <sys/vnode.h>
48 46 #include <sys/proc.h>
49 47 #include <sys/conf.h>
50 48 #include <sys/debug.h>
51 49 #include <sys/archsystm.h>
52 50 #include <sys/lgrp.h>
53 51
54 52 #include <vm/page.h>
55 53 #include <vm/hat.h>
56 54 #include <vm/as.h>
57 55 #include <vm/seg.h>
58 56 #include <vm/vpage.h>
59 57
60 58 /*
61 59 * Private seg op routines.
62 60 */
63 61 static int segnf_dup(struct seg *seg, struct seg *newseg);
64 62 static int segnf_unmap(struct seg *seg, caddr_t addr, size_t len);
65 63 static void segnf_free(struct seg *seg);
66 64 static faultcode_t segnf_nomap(void);
67 65 static int segnf_setprot(struct seg *seg, caddr_t addr,
68 66 size_t len, uint_t prot);
69 67 static int segnf_checkprot(struct seg *seg, caddr_t addr,
70 68 size_t len, uint_t prot);
71 69 static void segnf_badop(void);
72 70 static int segnf_nop(void);
73 71 static int segnf_getprot(struct seg *seg, caddr_t addr,
74 72 size_t len, uint_t *protv);
75 73 static u_offset_t segnf_getoffset(struct seg *seg, caddr_t addr);
76 74 static int segnf_gettype(struct seg *seg, caddr_t addr);
77 75 static int segnf_getvp(struct seg *seg, caddr_t addr, struct vnode **vpp);
78 76 static void segnf_dump(struct seg *seg);
|
↓ open down ↓ |
33 lines elided |
↑ open up ↑ |
79 77 static int segnf_pagelock(struct seg *seg, caddr_t addr, size_t len,
80 78 struct page ***ppp, enum lock_type type, enum seg_rw rw);
81 79 static int segnf_setpagesize(struct seg *seg, caddr_t addr, size_t len,
82 80 uint_t szc);
83 81 static int segnf_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp);
84 82 static lgrp_mem_policy_info_t *segnf_getpolicy(struct seg *seg,
85 83 caddr_t addr);
86 84
87 85
88 86 struct seg_ops segnf_ops = {
89 - segnf_dup,
90 - segnf_unmap,
91 - segnf_free,
92 - (faultcode_t (*)(struct hat *, struct seg *, caddr_t, size_t,
93 - enum fault_type, enum seg_rw))
94 - segnf_nomap, /* fault */
95 - (faultcode_t (*)(struct seg *, caddr_t))
96 - segnf_nomap, /* faulta */
97 - segnf_setprot,
98 - segnf_checkprot,
99 - (int (*)())segnf_badop, /* kluster */
100 - (size_t (*)(struct seg *))NULL, /* swapout */
101 - (int (*)(struct seg *, caddr_t, size_t, int, uint_t))
102 - segnf_nop, /* sync */
103 - (size_t (*)(struct seg *, caddr_t, size_t, char *))
104 - segnf_nop, /* incore */
105 - (int (*)(struct seg *, caddr_t, size_t, int, int, ulong_t *, size_t))
106 - segnf_nop, /* lockop */
107 - segnf_getprot,
108 - segnf_getoffset,
109 - segnf_gettype,
110 - segnf_getvp,
111 - (int (*)(struct seg *, caddr_t, size_t, uint_t))
112 - segnf_nop, /* advise */
113 - segnf_dump,
114 - segnf_pagelock,
115 - segnf_setpagesize,
116 - segnf_getmemid,
117 - segnf_getpolicy,
87 + .dup = segnf_dup,
88 + .unmap = segnf_unmap,
89 + .free = segnf_free,
90 + .fault = (faultcode_t (*)(struct hat *, struct seg *, caddr_t,
91 + size_t, enum fault_type, enum seg_rw))segnf_nomap,
92 + .faulta = (faultcode_t (*)(struct seg *, caddr_t)) segnf_nomap,
93 + .setprot = segnf_setprot,
94 + .checkprot = segnf_checkprot,
95 + .kluster = (int (*)())segnf_badop,
96 + .sync = (int (*)(struct seg *, caddr_t, size_t, int, uint_t))
97 + segnf_nop,
98 + .incore = (size_t (*)(struct seg *, caddr_t, size_t, char *))
99 + segnf_nop,
100 + .lockop = (int (*)(struct seg *, caddr_t, size_t, int, int,
101 + ulong_t *, size_t))segnf_nop,
102 + .getprot = segnf_getprot,
103 + .getoffset = segnf_getoffset,
104 + .gettype = segnf_gettype,
105 + .getvp = segnf_getvp,
106 + .advise = (int (*)(struct seg *, caddr_t, size_t, uint_t))
107 + segnf_nop,
108 + .dump = segnf_dump,
109 + .pagelock = segnf_pagelock,
110 + .setpagesize = segnf_setpagesize,
111 + .getmemid = segnf_getmemid,
112 + .getpolicy = segnf_getpolicy,
118 113 };
119 114
120 115 /*
121 116 * vnode and page for the page of zeros we use for the nf mappings.
122 117 */
123 118 static kmutex_t segnf_lock;
124 119 static struct vnode nfvp;
125 120 static struct page **nfpp;
126 121
127 122 #define addr_to_vcolor(addr) \
128 123 (shm_alignment) ? \
129 124 ((int)(((uintptr_t)(addr) & (shm_alignment - 1)) >> PAGESHIFT)) : 0
130 125
131 126 /*
132 127 * We try to limit the number of Non-fault segments created.
133 128 * Non fault segments are created to optimize sparc V9 code which uses
134 129 * the sparc nonfaulting load ASI (ASI_PRIMARY_NOFAULT).
135 130 *
136 131 * There are several reasons why creating too many non-fault segments
137 132 * could cause problems.
138 133 *
139 134 * First, excessive allocation of kernel resources for the seg
140 135 * structures and the HAT data to map the zero pages.
141 136 *
142 137 * Secondly, creating nofault segments actually uses up user virtual
143 138 * address space. This makes it unavailable for subsequent mmap(0, ...)
144 139 * calls which use as_gap() to find empty va regions. Creation of too
145 140 * many nofault segments could thus interfere with the ability of the
146 141 * runtime linker to load a shared object.
147 142 */
148 143 #define MAXSEGFORNF (10000)
149 144 #define MAXNFSEARCH (5)
150 145
151 146
152 147 /*
153 148 * Must be called from startup()
154 149 */
155 150 void
156 151 segnf_init()
157 152 {
158 153 mutex_init(&segnf_lock, NULL, MUTEX_DEFAULT, NULL);
159 154 }
160 155
161 156
162 157 /*
163 158 * Create a no-fault segment.
164 159 *
165 160 * The no-fault segment is not technically necessary, as the code in
166 161 * nfload() in trap.c will emulate the SPARC instruction and load
167 162 * a value of zero in the destination register.
168 163 *
169 164 * However, this code tries to put a page of zero's at the nofault address
170 165 * so that subsequent non-faulting loads to the same page will not
171 166 * trap with a tlb miss.
172 167 *
173 168 * In order to help limit the number of segments we merge adjacent nofault
174 169 * segments into a single segment. If we get a large number of segments
175 170 * we'll also try to delete a random other nf segment.
176 171 */
177 172 /* ARGSUSED */
178 173 int
179 174 segnf_create(struct seg *seg, void *argsp)
180 175 {
181 176 uint_t prot;
182 177 pgcnt_t vacpgs;
183 178 u_offset_t off = 0;
184 179 caddr_t vaddr = NULL;
185 180 int i, color;
186 181 struct seg *s1;
187 182 struct seg *s2;
188 183 size_t size;
189 184 struct as *as = seg->s_as;
190 185
191 186 ASSERT(as && AS_WRITE_HELD(as, &as->a_lock));
192 187
193 188 /*
194 189 * Need a page per virtual color or just 1 if no vac.
195 190 */
196 191 mutex_enter(&segnf_lock);
197 192 if (nfpp == NULL) {
198 193 struct seg kseg;
199 194
200 195 vacpgs = 1;
201 196 if (shm_alignment > PAGESIZE) {
202 197 vacpgs = shm_alignment >> PAGESHIFT;
203 198 }
204 199
205 200 nfpp = kmem_alloc(sizeof (*nfpp) * vacpgs, KM_SLEEP);
206 201
207 202 kseg.s_as = &kas;
208 203 for (i = 0; i < vacpgs; i++, off += PAGESIZE,
209 204 vaddr += PAGESIZE) {
210 205 nfpp[i] = page_create_va(&nfvp, off, PAGESIZE,
211 206 PG_WAIT | PG_NORELOC, &kseg, vaddr);
212 207 page_io_unlock(nfpp[i]);
213 208 page_downgrade(nfpp[i]);
214 209 pagezero(nfpp[i], 0, PAGESIZE);
215 210 }
216 211 }
217 212 mutex_exit(&segnf_lock);
218 213
219 214 hat_map(as->a_hat, seg->s_base, seg->s_size, HAT_MAP);
220 215
221 216 /*
222 217 * s_data can't be NULL because of ASSERTS in the common vm code.
223 218 */
224 219 seg->s_ops = &segnf_ops;
225 220 seg->s_data = seg;
226 221 seg->s_flags |= S_PURGE;
227 222
228 223 mutex_enter(&as->a_contents);
229 224 as->a_flags |= AS_NEEDSPURGE;
230 225 mutex_exit(&as->a_contents);
231 226
232 227 prot = PROT_READ;
233 228 color = addr_to_vcolor(seg->s_base);
234 229 if (as != &kas)
235 230 prot |= PROT_USER;
236 231 hat_memload(as->a_hat, seg->s_base, nfpp[color],
237 232 prot | HAT_NOFAULT, HAT_LOAD);
238 233
239 234 /*
240 235 * At this point see if we can concatenate a segment to
241 236 * a non-fault segment immediately before and/or after it.
242 237 */
243 238 if ((s1 = AS_SEGPREV(as, seg)) != NULL &&
244 239 s1->s_ops == &segnf_ops &&
245 240 s1->s_base + s1->s_size == seg->s_base) {
246 241 size = s1->s_size;
247 242 seg_free(s1);
248 243 seg->s_base -= size;
249 244 seg->s_size += size;
250 245 }
251 246
252 247 if ((s2 = AS_SEGNEXT(as, seg)) != NULL &&
253 248 s2->s_ops == &segnf_ops &&
254 249 seg->s_base + seg->s_size == s2->s_base) {
255 250 size = s2->s_size;
256 251 seg_free(s2);
257 252 seg->s_size += size;
258 253 }
259 254
260 255 /*
261 256 * if we already have a lot of segments, try to delete some other
262 257 * nofault segment to reduce the probability of uncontrolled segment
263 258 * creation.
264 259 *
265 260 * the code looks around quickly (no more than MAXNFSEARCH segments
266 261 * each way) for another NF segment and then deletes it.
267 262 */
268 263 if (avl_numnodes(&as->a_segtree) > MAXSEGFORNF) {
269 264 size = 0;
270 265 s2 = NULL;
271 266 s1 = AS_SEGPREV(as, seg);
272 267 while (size++ < MAXNFSEARCH && s1 != NULL) {
273 268 if (s1->s_ops == &segnf_ops)
274 269 s2 = s1;
275 270 s1 = AS_SEGPREV(s1->s_as, seg);
276 271 }
277 272 if (s2 == NULL) {
278 273 s1 = AS_SEGNEXT(as, seg);
279 274 while (size-- > 0 && s1 != NULL) {
280 275 if (s1->s_ops == &segnf_ops)
281 276 s2 = s1;
282 277 s1 = AS_SEGNEXT(as, seg);
283 278 }
284 279 }
285 280 if (s2 != NULL)
286 281 seg_unmap(s2);
287 282 }
288 283
289 284 return (0);
290 285 }
291 286
292 287 /*
293 288 * Never really need "No fault" segments, so they aren't dup'd.
294 289 */
295 290 /* ARGSUSED */
296 291 static int
297 292 segnf_dup(struct seg *seg, struct seg *newseg)
298 293 {
299 294 panic("segnf_dup");
300 295 return (0);
301 296 }
302 297
303 298 /*
304 299 * Split a segment at addr for length len.
305 300 */
306 301 static int
307 302 segnf_unmap(struct seg *seg, caddr_t addr, size_t len)
308 303 {
309 304 ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
310 305
311 306 /*
312 307 * Check for bad sizes.
313 308 */
314 309 if (addr < seg->s_base || addr + len > seg->s_base + seg->s_size ||
315 310 (len & PAGEOFFSET) || ((uintptr_t)addr & PAGEOFFSET)) {
316 311 cmn_err(CE_PANIC, "segnf_unmap: bad unmap size");
317 312 }
318 313
319 314 /*
320 315 * Unload any hardware translations in the range to be taken out.
321 316 */
322 317 hat_unload(seg->s_as->a_hat, addr, len, HAT_UNLOAD_UNMAP);
323 318
324 319 if (addr == seg->s_base && len == seg->s_size) {
325 320 /*
326 321 * Freeing entire segment.
327 322 */
328 323 seg_free(seg);
329 324 } else if (addr == seg->s_base) {
330 325 /*
331 326 * Freeing the beginning of the segment.
332 327 */
333 328 seg->s_base += len;
334 329 seg->s_size -= len;
335 330 } else if (addr + len == seg->s_base + seg->s_size) {
336 331 /*
337 332 * Freeing the end of the segment.
338 333 */
339 334 seg->s_size -= len;
340 335 } else {
341 336 /*
342 337 * The section to go is in the middle of the segment, so we
343 338 * have to cut it into two segments. We shrink the existing
344 339 * "seg" at the low end, and create "nseg" for the high end.
345 340 */
346 341 caddr_t nbase = addr + len;
347 342 size_t nsize = (seg->s_base + seg->s_size) - nbase;
348 343 struct seg *nseg;
349 344
350 345 /*
351 346 * Trim down "seg" before trying to stick "nseg" into the as.
352 347 */
353 348 seg->s_size = addr - seg->s_base;
354 349 nseg = seg_alloc(seg->s_as, nbase, nsize);
355 350 if (nseg == NULL)
356 351 cmn_err(CE_PANIC, "segnf_unmap: seg_alloc failed");
357 352
358 353 /*
359 354 * s_data can't be NULL because of ASSERTs in common VM code.
360 355 */
361 356 nseg->s_ops = seg->s_ops;
362 357 nseg->s_data = nseg;
363 358 nseg->s_flags |= S_PURGE;
364 359 mutex_enter(&seg->s_as->a_contents);
365 360 seg->s_as->a_flags |= AS_NEEDSPURGE;
366 361 mutex_exit(&seg->s_as->a_contents);
367 362 }
368 363
369 364 return (0);
370 365 }
371 366
372 367 /*
373 368 * Free a segment.
374 369 */
375 370 static void
376 371 segnf_free(struct seg *seg)
377 372 {
378 373 ASSERT(seg->s_as && AS_WRITE_HELD(seg->s_as, &seg->s_as->a_lock));
379 374 }
380 375
381 376 /*
382 377 * No faults allowed on segnf.
383 378 */
384 379 static faultcode_t
385 380 segnf_nomap(void)
386 381 {
387 382 return (FC_NOMAP);
388 383 }
389 384
390 385 /* ARGSUSED */
391 386 static int
392 387 segnf_setprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot)
393 388 {
394 389 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
395 390 return (EACCES);
396 391 }
397 392
398 393 /* ARGSUSED */
399 394 static int
400 395 segnf_checkprot(struct seg *seg, caddr_t addr, size_t len, uint_t prot)
401 396 {
402 397 uint_t sprot;
403 398 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
404 399
405 400 sprot = seg->s_as == &kas ? PROT_READ : PROT_READ|PROT_USER;
406 401 return ((prot & sprot) == prot ? 0 : EACCES);
407 402 }
408 403
409 404 static void
410 405 segnf_badop(void)
411 406 {
412 407 panic("segnf_badop");
413 408 /*NOTREACHED*/
414 409 }
415 410
416 411 static int
417 412 segnf_nop(void)
418 413 {
419 414 return (0);
420 415 }
421 416
422 417 static int
423 418 segnf_getprot(struct seg *seg, caddr_t addr, size_t len, uint_t *protv)
424 419 {
425 420 size_t pgno = seg_page(seg, addr + len) - seg_page(seg, addr) + 1;
426 421 size_t p;
427 422 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
428 423
429 424 for (p = 0; p < pgno; ++p)
430 425 protv[p] = PROT_READ;
431 426 return (0);
432 427 }
433 428
434 429 /* ARGSUSED */
435 430 static u_offset_t
436 431 segnf_getoffset(struct seg *seg, caddr_t addr)
437 432 {
438 433 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
439 434
440 435 return ((u_offset_t)0);
441 436 }
442 437
443 438 /* ARGSUSED */
444 439 static int
445 440 segnf_gettype(struct seg *seg, caddr_t addr)
446 441 {
447 442 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
448 443
449 444 return (MAP_SHARED);
450 445 }
451 446
452 447 /* ARGSUSED */
453 448 static int
454 449 segnf_getvp(struct seg *seg, caddr_t addr, struct vnode **vpp)
455 450 {
456 451 ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock));
457 452
458 453 *vpp = &nfvp;
459 454 return (0);
460 455 }
461 456
462 457 /*
463 458 * segnf pages are not dumped, so we just return
464 459 */
465 460 /* ARGSUSED */
466 461 static void
467 462 segnf_dump(struct seg *seg)
468 463 {}
469 464
470 465 /*ARGSUSED*/
471 466 static int
472 467 segnf_pagelock(struct seg *seg, caddr_t addr, size_t len,
473 468 struct page ***ppp, enum lock_type type, enum seg_rw rw)
474 469 {
475 470 return (ENOTSUP);
476 471 }
477 472
478 473 /*ARGSUSED*/
479 474 static int
480 475 segnf_setpagesize(struct seg *seg, caddr_t addr, size_t len,
481 476 uint_t szc)
482 477 {
483 478 return (ENOTSUP);
484 479 }
485 480
486 481 /*ARGSUSED*/
487 482 static int
488 483 segnf_getmemid(struct seg *seg, caddr_t addr, memid_t *memidp)
489 484 {
490 485 return (ENODEV);
491 486 }
492 487
493 488 /*ARGSUSED*/
494 489 static lgrp_mem_policy_info_t *
495 490 segnf_getpolicy(struct seg *seg, caddr_t addr)
496 491 {
497 492 return (NULL);
498 493 }
|
↓ open down ↓ |
371 lines elided |
↑ open up ↑ |
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX