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