1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * The Mach Operating System project at Carnegie-Mellon University. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)vm_page.h 8.2 (Berkeley) 12/13/93 33 * 34 * 35 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 36 * All rights reserved. 37 * 38 * Authors: Avadis Tevanian, Jr., Michael Wayne Young 39 * 40 * Permission to use, copy, modify and distribute this software and 41 * its documentation is hereby granted, provided that both the copyright 42 * notice and this permission notice appear in all copies of the 43 * software, derivative works or modified versions, and any portions 44 * thereof, and that both notices appear in supporting documentation. 45 * 46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 49 * 50 * Carnegie Mellon requests users of this software to return to 51 * 52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 53 * School of Computer Science 54 * Carnegie Mellon University 55 * Pittsburgh PA 15213-3890 56 * 57 * any improvements or extensions that they make and grant Carnegie the 58 * rights to redistribute these changes. 59 * 60 * $FreeBSD$ 61 */ 62 63 /* 64 * Resident memory system definitions. 65 */ 66 67 #ifndef _VM_PAGE_ 68 #define _VM_PAGE_ 69 70 #include <vm/pmap.h> 71 72 /* 73 * Management of resident (logical) pages. 74 * 75 * A small structure is kept for each resident 76 * page, indexed by page number. Each structure 77 * is an element of several collections: 78 * 79 * A radix tree used to quickly 80 * perform object/offset lookups 81 * 82 * A list of all pages for a given object, 83 * so they can be quickly deactivated at 84 * time of deallocation. 85 * 86 * An ordered list of pages due for pageout. 87 * 88 * In addition, the structure contains the object 89 * and offset to which this page belongs (for pageout), 90 * and sundry status bits. 91 * 92 * In general, operations on this structure's mutable fields are 93 * synchronized using either one of or a combination of the lock on the 94 * object that the page belongs to (O), the pool lock for the page (P), 95 * or the lock for either the free or paging queue (Q). If a field is 96 * annotated below with two of these locks, then holding either lock is 97 * sufficient for read access, but both locks are required for write 98 * access. 99 * 100 * In contrast, the synchronization of accesses to the page's 101 * dirty field is machine dependent (M). In the 102 * machine-independent layer, the lock on the object that the 103 * page belongs to must be held in order to operate on the field. 104 * However, the pmap layer is permitted to set all bits within 105 * the field without holding that lock. If the underlying 106 * architecture does not support atomic read-modify-write 107 * operations on the field's type, then the machine-independent 108 * layer uses a 32-bit atomic on the aligned 32-bit word that 109 * contains the dirty field. In the machine-independent layer, 110 * the implementation of read-modify-write operations on the 111 * field is encapsulated in vm_page_clear_dirty_mask(). 112 */ 113 114 #if PAGE_SIZE == 4096 115 #define VM_PAGE_BITS_ALL 0xffu 116 typedef uint8_t vm_page_bits_t; 117 #elif PAGE_SIZE == 8192 118 #define VM_PAGE_BITS_ALL 0xffffu 119 typedef uint16_t vm_page_bits_t; 120 #elif PAGE_SIZE == 16384 121 #define VM_PAGE_BITS_ALL 0xffffffffu 122 typedef uint32_t vm_page_bits_t; 123 #elif PAGE_SIZE == 32768 124 #define VM_PAGE_BITS_ALL 0xfffffffffffffffflu 125 typedef uint64_t vm_page_bits_t; 126 #endif 127 128 struct vm_page { 129 union { 130 TAILQ_ENTRY(vm_page) q; /* page queue or free list (Q) */ 131 struct { 132 SLIST_ENTRY(vm_page) ss; /* private slists */ 133 void *pv; 134 } s; 135 struct { 136 u_long p; 137 u_long v; 138 } memguard; 139 } plinks; 140 TAILQ_ENTRY(vm_page) listq; /* pages in same object (O) */ 141 vm_object_t object; /* which object am I in (O,P) */ 142 vm_pindex_t pindex; /* offset into object (O,P) */ 143 vm_paddr_t phys_addr; /* physical address of page */ 144 struct md_page md; /* machine dependent stuff */ 145 u_int wire_count; /* wired down maps refs (P) */ 146 volatile u_int busy_lock; /* busy owners lock */ 147 uint16_t hold_count; /* page hold count (P) */ 148 uint16_t flags; /* page PG_* flags (P) */ 149 uint8_t aflags; /* access is atomic */ 150 uint8_t oflags; /* page VPO_* flags (O) */ 151 uint8_t queue; /* page queue index (P,Q) */ 152 int8_t psind; /* pagesizes[] index (O) */ 153 int8_t segind; 154 uint8_t order; /* index of the buddy queue */ 155 uint8_t pool; 156 u_char act_count; /* page usage count (P) */ 157 /* NOTE that these must support one bit per DEV_BSIZE in a page */ 158 /* so, on normal X86 kernels, they must be at least 8 bits wide */ 159 vm_page_bits_t valid; /* map of valid DEV_BSIZE chunks (O) */ 160 vm_page_bits_t dirty; /* map of dirty DEV_BSIZE chunks (M) */ 161 }; 162 163 /* 164 * Page flags stored in oflags: 165 * 166 * Access to these page flags is synchronized by the lock on the object 167 * containing the page (O). 168 * 169 * Note: VPO_UNMANAGED (used by OBJT_DEVICE, OBJT_PHYS and OBJT_SG) 170 * indicates that the page is not under PV management but 171 * otherwise should be treated as a normal page. Pages not 172 * under PV management cannot be paged out via the 173 * object/vm_page_t because there is no knowledge of their pte 174 * mappings, and such pages are also not on any PQ queue. 175 * 176 */ 177 #define VPO_UNUSED01 0x01 /* --available-- */ 178 #define VPO_SWAPSLEEP 0x02 /* waiting for swap to finish */ 179 #define VPO_UNMANAGED 0x04 /* no PV management for page */ 180 #define VPO_SWAPINPROG 0x08 /* swap I/O in progress on page */ 181 #define VPO_NOSYNC 0x10 /* do not collect for syncer */ 182 183 /* 184 * Busy page implementation details. 185 * The algorithm is taken mostly by rwlock(9) and sx(9) locks implementation, 186 * even if the support for owner identity is removed because of size 187 * constraints. Checks on lock recursion are then not possible, while the 188 * lock assertions effectiveness is someway reduced. 189 */ 190 #define VPB_BIT_SHARED 0x01 191 #define VPB_BIT_EXCLUSIVE 0x02 192 #define VPB_BIT_WAITERS 0x04 193 #define VPB_BIT_FLAGMASK \ 194 (VPB_BIT_SHARED | VPB_BIT_EXCLUSIVE | VPB_BIT_WAITERS) 195 196 #define VPB_SHARERS_SHIFT 3 197 #define VPB_SHARERS(x) \ 198 (((x) & ~VPB_BIT_FLAGMASK) >> VPB_SHARERS_SHIFT) 199 #define VPB_SHARERS_WORD(x) ((x) << VPB_SHARERS_SHIFT | VPB_BIT_SHARED) 200 #define VPB_ONE_SHARER (1 << VPB_SHARERS_SHIFT) 201 202 #define VPB_SINGLE_EXCLUSIVER VPB_BIT_EXCLUSIVE 203 204 #define VPB_UNBUSIED VPB_SHARERS_WORD(0) 205 206 #define PQ_NONE 255 207 #define PQ_INACTIVE 0 208 #define PQ_ACTIVE 1 209 #define PQ_LAUNDRY 2 210 #define PQ_UNSWAPPABLE 3 211 #define PQ_COUNT 4 212 213 TAILQ_HEAD(pglist, vm_page); 214 SLIST_HEAD(spglist, vm_page); 215 216 struct vm_pagequeue { 217 struct mtx pq_mutex; 218 struct pglist pq_pl; 219 int pq_cnt; 220 u_int * const pq_vcnt; 221 const char * const pq_name; 222 } __aligned(CACHE_LINE_SIZE); 223 224 225 struct vm_domain { 226 struct vm_pagequeue vmd_pagequeues[PQ_COUNT]; 227 u_int vmd_page_count; 228 u_int vmd_free_count; 229 long vmd_segs; /* bitmask of the segments */ 230 boolean_t vmd_oom; 231 int vmd_oom_seq; 232 int vmd_last_active_scan; 233 struct vm_page vmd_laundry_marker; 234 struct vm_page vmd_marker; /* marker for pagedaemon private use */ 235 struct vm_page vmd_inacthead; /* marker for LRU-defeating insertions */ 236 }; 237 238 extern struct vm_domain vm_dom[MAXMEMDOM]; 239 240 #define vm_pagequeue_assert_locked(pq) mtx_assert(&(pq)->pq_mutex, MA_OWNED) 241 #define vm_pagequeue_lock(pq) mtx_lock(&(pq)->pq_mutex) 242 #define vm_pagequeue_lockptr(pq) (&(pq)->pq_mutex) 243 #define vm_pagequeue_unlock(pq) mtx_unlock(&(pq)->pq_mutex) 244 245 #ifdef _KERNEL 246 extern vm_page_t bogus_page; 247 248 static __inline void 249 vm_pagequeue_cnt_add(struct vm_pagequeue *pq, int addend) 250 { 251 252 #ifdef notyet 253 vm_pagequeue_assert_locked(pq); 254 #endif 255 pq->pq_cnt += addend; 256 atomic_add_int(pq->pq_vcnt, addend); 257 } 258 #define vm_pagequeue_cnt_inc(pq) vm_pagequeue_cnt_add((pq), 1) 259 #define vm_pagequeue_cnt_dec(pq) vm_pagequeue_cnt_add((pq), -1) 260 #endif /* _KERNEL */ 261 262 extern struct mtx_padalign vm_page_queue_free_mtx; 263 extern struct mtx_padalign pa_lock[]; 264 265 #if defined(__arm__) 266 #define PDRSHIFT PDR_SHIFT 267 #elif !defined(PDRSHIFT) 268 #define PDRSHIFT 21 269 #endif 270 271 #define pa_index(pa) ((pa) >> PDRSHIFT) 272 #define PA_LOCKPTR(pa) ((struct mtx *)(&pa_lock[pa_index(pa) % PA_LOCK_COUNT])) 273 #define PA_LOCKOBJPTR(pa) ((struct lock_object *)PA_LOCKPTR((pa))) 274 #define PA_LOCK(pa) mtx_lock(PA_LOCKPTR(pa)) 275 #define PA_TRYLOCK(pa) mtx_trylock(PA_LOCKPTR(pa)) 276 #define PA_UNLOCK(pa) mtx_unlock(PA_LOCKPTR(pa)) 277 #define PA_UNLOCK_COND(pa) \ 278 do { \ 279 if ((pa) != 0) { \ 280 PA_UNLOCK((pa)); \ 281 (pa) = 0; \ 282 } \ 283 } while (0) 284 285 #define PA_LOCK_ASSERT(pa, a) mtx_assert(PA_LOCKPTR(pa), (a)) 286 287 #ifdef KLD_MODULE 288 #define vm_page_lock(m) vm_page_lock_KBI((m), LOCK_FILE, LOCK_LINE) 289 #define vm_page_unlock(m) vm_page_unlock_KBI((m), LOCK_FILE, LOCK_LINE) 290 #define vm_page_trylock(m) vm_page_trylock_KBI((m), LOCK_FILE, LOCK_LINE) 291 #else /* !KLD_MODULE */ 292 #define vm_page_lockptr(m) (PA_LOCKPTR(VM_PAGE_TO_PHYS((m)))) 293 #define vm_page_lock(m) mtx_lock(vm_page_lockptr((m))) 294 #define vm_page_unlock(m) mtx_unlock(vm_page_lockptr((m))) 295 #define vm_page_trylock(m) mtx_trylock(vm_page_lockptr((m))) 296 #endif 297 #if defined(INVARIANTS) 298 #define vm_page_assert_locked(m) \ 299 vm_page_assert_locked_KBI((m), __FILE__, __LINE__) 300 #define vm_page_lock_assert(m, a) \ 301 vm_page_lock_assert_KBI((m), (a), __FILE__, __LINE__) 302 #else 303 #define vm_page_assert_locked(m) 304 #define vm_page_lock_assert(m, a) 305 #endif 306 307 /* 308 * The vm_page's aflags are updated using atomic operations. To set or clear 309 * these flags, the functions vm_page_aflag_set() and vm_page_aflag_clear() 310 * must be used. Neither these flags nor these functions are part of the KBI. 311 * 312 * PGA_REFERENCED may be cleared only if the page is locked. It is set by 313 * both the MI and MD VM layers. However, kernel loadable modules should not 314 * directly set this flag. They should call vm_page_reference() instead. 315 * 316 * PGA_WRITEABLE is set exclusively on managed pages by pmap_enter(). 317 * When it does so, the object must be locked, or the page must be 318 * exclusive busied. The MI VM layer must never access this flag 319 * directly. Instead, it should call pmap_page_is_write_mapped(). 320 * 321 * PGA_EXECUTABLE may be set by pmap routines, and indicates that a page has 322 * at least one executable mapping. It is not consumed by the MI VM layer. 323 */ 324 #define PGA_WRITEABLE 0x01 /* page may be mapped writeable */ 325 #define PGA_REFERENCED 0x02 /* page has been referenced */ 326 #define PGA_EXECUTABLE 0x04 /* page may be mapped executable */ 327 328 /* 329 * Page flags. If changed at any other time than page allocation or 330 * freeing, the modification must be protected by the vm_page lock. 331 */ 332 #define PG_FICTITIOUS 0x0004 /* physical page doesn't exist */ 333 #define PG_ZERO 0x0008 /* page is zeroed */ 334 #define PG_MARKER 0x0010 /* special queue marker page */ 335 #define PG_NODUMP 0x0080 /* don't include this page in a dump */ 336 #define PG_UNHOLDFREE 0x0100 /* delayed free of a held page */ 337 338 /* 339 * Misc constants. 340 */ 341 #define ACT_DECLINE 1 342 #define ACT_ADVANCE 3 343 #define ACT_INIT 5 344 #define ACT_MAX 64 345 346 #ifdef _KERNEL 347 348 #include <sys/systm.h> 349 350 #include <machine/atomic.h> 351 352 /* 353 * Each pageable resident page falls into one of five lists: 354 * 355 * free 356 * Available for allocation now. 357 * 358 * inactive 359 * Low activity, candidates for reclamation. 360 * This list is approximately LRU ordered. 361 * 362 * laundry 363 * This is the list of pages that should be 364 * paged out next. 365 * 366 * unswappable 367 * Dirty anonymous pages that cannot be paged 368 * out because no swap device is configured. 369 * 370 * active 371 * Pages that are "active", i.e., they have been 372 * recently referenced. 373 * 374 */ 375 376 extern int vm_page_zero_count; 377 378 extern vm_page_t vm_page_array; /* First resident page in table */ 379 extern long vm_page_array_size; /* number of vm_page_t's */ 380 extern long first_page; /* first physical page number */ 381 382 #define VM_PAGE_TO_PHYS(entry) ((entry)->phys_addr) 383 384 /* 385 * PHYS_TO_VM_PAGE() returns the vm_page_t object that represents a memory 386 * page to which the given physical address belongs. The correct vm_page_t 387 * object is returned for addresses that are not page-aligned. 388 */ 389 vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa); 390 391 /* 392 * Page allocation parameters for vm_page for the functions 393 * vm_page_alloc(), vm_page_grab(), vm_page_alloc_contig() and 394 * vm_page_alloc_freelist(). Some functions support only a subset 395 * of the flags, and ignore others, see the flags legend. 396 * 397 * Bits 0 - 1 define class. 398 * Bits 2 - 15 dedicated for flags. 399 * Legend: 400 * (a) - vm_page_alloc() supports the flag. 401 * (c) - vm_page_alloc_contig() supports the flag. 402 * (f) - vm_page_alloc_freelist() supports the flag. 403 * (g) - vm_page_grab() supports the flag. 404 * Bits above 15 define the count of additional pages that the caller 405 * intends to allocate. 406 */ 407 #define VM_ALLOC_NORMAL 0 408 #define VM_ALLOC_INTERRUPT 1 409 #define VM_ALLOC_SYSTEM 2 410 #define VM_ALLOC_CLASS_MASK 3 411 #define VM_ALLOC_WIRED 0x0020 /* (acfg) Allocate non pageable page */ 412 #define VM_ALLOC_ZERO 0x0040 /* (acfg) Try to obtain a zeroed page */ 413 #define VM_ALLOC_NOOBJ 0x0100 /* (acg) No associated object */ 414 #define VM_ALLOC_NOBUSY 0x0200 /* (acg) Do not busy the page */ 415 #define VM_ALLOC_IGN_SBUSY 0x1000 /* (g) Ignore shared busy flag */ 416 #define VM_ALLOC_NODUMP 0x2000 /* (ag) don't include in dump */ 417 #define VM_ALLOC_SBUSY 0x4000 /* (acg) Shared busy the page */ 418 #define VM_ALLOC_NOWAIT 0x8000 /* (g) Do not sleep, return NULL */ 419 #define VM_ALLOC_COUNT_SHIFT 16 420 #define VM_ALLOC_COUNT(count) ((count) << VM_ALLOC_COUNT_SHIFT) 421 422 #ifdef M_NOWAIT 423 static inline int 424 malloc2vm_flags(int malloc_flags) 425 { 426 int pflags; 427 428 KASSERT((malloc_flags & M_USE_RESERVE) == 0 || 429 (malloc_flags & M_NOWAIT) != 0, 430 ("M_USE_RESERVE requires M_NOWAIT")); 431 pflags = (malloc_flags & M_USE_RESERVE) != 0 ? VM_ALLOC_INTERRUPT : 432 VM_ALLOC_SYSTEM; 433 if ((malloc_flags & M_ZERO) != 0) 434 pflags |= VM_ALLOC_ZERO; 435 if ((malloc_flags & M_NODUMP) != 0) 436 pflags |= VM_ALLOC_NODUMP; 437 return (pflags); 438 } 439 #endif 440 441 void vm_page_busy_downgrade(vm_page_t m); 442 void vm_page_busy_sleep(vm_page_t m, const char *msg, bool nonshared); 443 void vm_page_flash(vm_page_t m); 444 void vm_page_hold(vm_page_t mem); 445 void vm_page_unhold(vm_page_t mem); 446 void vm_page_free(vm_page_t m); 447 void vm_page_free_zero(vm_page_t m); 448 449 void vm_page_activate (vm_page_t); 450 void vm_page_advise(vm_page_t m, int advice); 451 vm_page_t vm_page_alloc (vm_object_t, vm_pindex_t, int); 452 vm_page_t vm_page_alloc_contig(vm_object_t object, vm_pindex_t pindex, int req, 453 u_long npages, vm_paddr_t low, vm_paddr_t high, u_long alignment, 454 vm_paddr_t boundary, vm_memattr_t memattr); 455 vm_page_t vm_page_alloc_freelist(int, int); 456 vm_page_t vm_page_grab (vm_object_t, vm_pindex_t, int); 457 int vm_page_try_to_free (vm_page_t); 458 void vm_page_deactivate (vm_page_t); 459 void vm_page_deactivate_noreuse(vm_page_t); 460 void vm_page_dequeue(vm_page_t m); 461 void vm_page_dequeue_locked(vm_page_t m); 462 vm_page_t vm_page_find_least(vm_object_t, vm_pindex_t); 463 vm_page_t vm_page_getfake(vm_paddr_t paddr, vm_memattr_t memattr); 464 void vm_page_initfake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr); 465 int vm_page_insert (vm_page_t, vm_object_t, vm_pindex_t); 466 void vm_page_launder(vm_page_t m); 467 vm_page_t vm_page_lookup (vm_object_t, vm_pindex_t); 468 vm_page_t vm_page_next(vm_page_t m); 469 int vm_page_pa_tryrelock(pmap_t, vm_paddr_t, vm_paddr_t *); 470 struct vm_pagequeue *vm_page_pagequeue(vm_page_t m); 471 vm_page_t vm_page_prev(vm_page_t m); 472 boolean_t vm_page_ps_is_valid(vm_page_t m); 473 void vm_page_putfake(vm_page_t m); 474 void vm_page_readahead_finish(vm_page_t m); 475 bool vm_page_reclaim_contig(int req, u_long npages, vm_paddr_t low, 476 vm_paddr_t high, u_long alignment, vm_paddr_t boundary); 477 void vm_page_reference(vm_page_t m); 478 void vm_page_remove (vm_page_t); 479 int vm_page_rename (vm_page_t, vm_object_t, vm_pindex_t); 480 vm_page_t vm_page_replace(vm_page_t mnew, vm_object_t object, 481 vm_pindex_t pindex); 482 void vm_page_requeue(vm_page_t m); 483 void vm_page_requeue_locked(vm_page_t m); 484 int vm_page_sbusied(vm_page_t m); 485 vm_page_t vm_page_scan_contig(u_long npages, vm_page_t m_start, 486 vm_page_t m_end, u_long alignment, vm_paddr_t boundary, int options); 487 void vm_page_set_valid_range(vm_page_t m, int base, int size); 488 int vm_page_sleep_if_busy(vm_page_t m, const char *msg); 489 vm_offset_t vm_page_startup(vm_offset_t vaddr); 490 void vm_page_sunbusy(vm_page_t m); 491 int vm_page_trysbusy(vm_page_t m); 492 void vm_page_unhold_pages(vm_page_t *ma, int count); 493 void vm_page_unswappable(vm_page_t m); 494 boolean_t vm_page_unwire(vm_page_t m, uint8_t queue); 495 void vm_page_updatefake(vm_page_t m, vm_paddr_t paddr, vm_memattr_t memattr); 496 void vm_page_wire (vm_page_t); 497 void vm_page_xunbusy_hard(vm_page_t m); 498 void vm_page_xunbusy_maybelocked(vm_page_t m); 499 void vm_page_set_validclean (vm_page_t, int, int); 500 void vm_page_clear_dirty (vm_page_t, int, int); 501 void vm_page_set_invalid (vm_page_t, int, int); 502 int vm_page_is_valid (vm_page_t, int, int); 503 void vm_page_test_dirty (vm_page_t); 504 vm_page_bits_t vm_page_bits(int base, int size); 505 void vm_page_zero_invalid(vm_page_t m, boolean_t setvalid); 506 void vm_page_free_toq(vm_page_t m); 507 508 void vm_page_dirty_KBI(vm_page_t m); 509 void vm_page_lock_KBI(vm_page_t m, const char *file, int line); 510 void vm_page_unlock_KBI(vm_page_t m, const char *file, int line); 511 int vm_page_trylock_KBI(vm_page_t m, const char *file, int line); 512 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 513 void vm_page_assert_locked_KBI(vm_page_t m, const char *file, int line); 514 void vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line); 515 #endif 516 517 #define vm_page_assert_sbusied(m) \ 518 KASSERT(vm_page_sbusied(m), \ 519 ("vm_page_assert_sbusied: page %p not shared busy @ %s:%d", \ 520 (m), __FILE__, __LINE__)) 521 522 #define vm_page_assert_unbusied(m) \ 523 KASSERT(!vm_page_busied(m), \ 524 ("vm_page_assert_unbusied: page %p busy @ %s:%d", \ 525 (m), __FILE__, __LINE__)) 526 527 #define vm_page_assert_xbusied(m) \ 528 KASSERT(vm_page_xbusied(m), \ 529 ("vm_page_assert_xbusied: page %p not exclusive busy @ %s:%d", \ 530 (m), __FILE__, __LINE__)) 531 532 #define vm_page_busied(m) \ 533 ((m)->busy_lock != VPB_UNBUSIED) 534 535 #define vm_page_sbusy(m) do { \ 536 if (!vm_page_trysbusy(m)) \ 537 panic("%s: page %p failed shared busying", __func__, \ 538 (m)); \ 539 } while (0) 540 541 #define vm_page_tryxbusy(m) \ 542 (atomic_cmpset_acq_int(&(m)->busy_lock, VPB_UNBUSIED, \ 543 VPB_SINGLE_EXCLUSIVER)) 544 545 #define vm_page_xbusied(m) \ 546 (((m)->busy_lock & VPB_SINGLE_EXCLUSIVER) != 0) 547 548 #define vm_page_xbusy(m) do { \ 549 if (!vm_page_tryxbusy(m)) \ 550 panic("%s: page %p failed exclusive busying", __func__, \ 551 (m)); \ 552 } while (0) 553 554 /* Note: page m's lock must not be owned by the caller. */ 555 #define vm_page_xunbusy(m) do { \ 556 if (!atomic_cmpset_rel_int(&(m)->busy_lock, \ 557 VPB_SINGLE_EXCLUSIVER, VPB_UNBUSIED)) \ 558 vm_page_xunbusy_hard(m); \ 559 } while (0) 560 561 #ifdef INVARIANTS 562 void vm_page_object_lock_assert(vm_page_t m); 563 #define VM_PAGE_OBJECT_LOCK_ASSERT(m) vm_page_object_lock_assert(m) 564 void vm_page_assert_pga_writeable(vm_page_t m, uint8_t bits); 565 #define VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits) \ 566 vm_page_assert_pga_writeable(m, bits) 567 #else 568 #define VM_PAGE_OBJECT_LOCK_ASSERT(m) (void)0 569 #define VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits) (void)0 570 #endif 571 572 /* 573 * We want to use atomic updates for the aflags field, which is 8 bits wide. 574 * However, not all architectures support atomic operations on 8-bit 575 * destinations. In order that we can easily use a 32-bit operation, we 576 * require that the aflags field be 32-bit aligned. 577 */ 578 CTASSERT(offsetof(struct vm_page, aflags) % sizeof(uint32_t) == 0); 579 580 /* 581 * Clear the given bits in the specified page. 582 */ 583 static inline void 584 vm_page_aflag_clear(vm_page_t m, uint8_t bits) 585 { 586 uint32_t *addr, val; 587 588 /* 589 * The PGA_REFERENCED flag can only be cleared if the page is locked. 590 */ 591 if ((bits & PGA_REFERENCED) != 0) 592 vm_page_assert_locked(m); 593 594 /* 595 * Access the whole 32-bit word containing the aflags field with an 596 * atomic update. Parallel non-atomic updates to the other fields 597 * within this word are handled properly by the atomic update. 598 */ 599 addr = (void *)&m->aflags; 600 KASSERT(((uintptr_t)addr & (sizeof(uint32_t) - 1)) == 0, 601 ("vm_page_aflag_clear: aflags is misaligned")); 602 val = bits; 603 #if BYTE_ORDER == BIG_ENDIAN 604 val <<= 24; 605 #endif 606 atomic_clear_32(addr, val); 607 } 608 609 /* 610 * Set the given bits in the specified page. 611 */ 612 static inline void 613 vm_page_aflag_set(vm_page_t m, uint8_t bits) 614 { 615 uint32_t *addr, val; 616 617 VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits); 618 619 /* 620 * Access the whole 32-bit word containing the aflags field with an 621 * atomic update. Parallel non-atomic updates to the other fields 622 * within this word are handled properly by the atomic update. 623 */ 624 addr = (void *)&m->aflags; 625 KASSERT(((uintptr_t)addr & (sizeof(uint32_t) - 1)) == 0, 626 ("vm_page_aflag_set: aflags is misaligned")); 627 val = bits; 628 #if BYTE_ORDER == BIG_ENDIAN 629 val <<= 24; 630 #endif 631 atomic_set_32(addr, val); 632 } 633 634 /* 635 * vm_page_dirty: 636 * 637 * Set all bits in the page's dirty field. 638 * 639 * The object containing the specified page must be locked if the 640 * call is made from the machine-independent layer. 641 * 642 * See vm_page_clear_dirty_mask(). 643 */ 644 static __inline void 645 vm_page_dirty(vm_page_t m) 646 { 647 648 /* Use vm_page_dirty_KBI() under INVARIANTS to save memory. */ 649 #if defined(KLD_MODULE) || defined(INVARIANTS) 650 vm_page_dirty_KBI(m); 651 #else 652 m->dirty = VM_PAGE_BITS_ALL; 653 #endif 654 } 655 656 /* 657 * vm_page_remque: 658 * 659 * If the given page is in a page queue, then remove it from that page 660 * queue. 661 * 662 * The page must be locked. 663 */ 664 static inline void 665 vm_page_remque(vm_page_t m) 666 { 667 668 if (m->queue != PQ_NONE) 669 vm_page_dequeue(m); 670 } 671 672 /* 673 * vm_page_undirty: 674 * 675 * Set page to not be dirty. Note: does not clear pmap modify bits 676 */ 677 static __inline void 678 vm_page_undirty(vm_page_t m) 679 { 680 681 VM_PAGE_OBJECT_LOCK_ASSERT(m); 682 m->dirty = 0; 683 } 684 685 static inline void 686 vm_page_replace_checked(vm_page_t mnew, vm_object_t object, vm_pindex_t pindex, 687 vm_page_t mold) 688 { 689 vm_page_t mret; 690 691 mret = vm_page_replace(mnew, object, pindex); 692 KASSERT(mret == mold, 693 ("invalid page replacement, mold=%p, mret=%p", mold, mret)); 694 695 /* Unused if !INVARIANTS. */ 696 (void)mold; 697 (void)mret; 698 } 699 700 static inline bool 701 vm_page_active(vm_page_t m) 702 { 703 704 return (m->queue == PQ_ACTIVE); 705 } 706 707 static inline bool 708 vm_page_inactive(vm_page_t m) 709 { 710 711 return (m->queue == PQ_INACTIVE); 712 } 713 714 static inline bool 715 vm_page_in_laundry(vm_page_t m) 716 { 717 718 return (m->queue == PQ_LAUNDRY || m->queue == PQ_UNSWAPPABLE); 719 } 720 721 #endif /* _KERNEL */ 722 #endif /* !_VM_PAGE_ */ 723