1 /*- 2 * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU) 3 * 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * The Mach Operating System project at Carnegie-Mellon University. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)vm_object.h 8.3 (Berkeley) 1/12/94 35 * 36 * 37 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 38 * All rights reserved. 39 * 40 * Authors: Avadis Tevanian, Jr., Michael Wayne Young 41 * 42 * Permission to use, copy, modify and distribute this software and 43 * its documentation is hereby granted, provided that both the copyright 44 * notice and this permission notice appear in all copies of the 45 * software, derivative works or modified versions, and any portions 46 * thereof, and that both notices appear in supporting documentation. 47 * 48 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 49 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 50 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 51 * 52 * Carnegie Mellon requests users of this software to return to 53 * 54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 55 * School of Computer Science 56 * Carnegie Mellon University 57 * Pittsburgh PA 15213-3890 58 * 59 * any improvements or extensions that they make and grant Carnegie the 60 * rights to redistribute these changes. 61 * 62 * $FreeBSD$ 63 */ 64 65 /* 66 * Virtual memory object module definitions. 67 */ 68 69 #ifndef _VM_OBJECT_ 70 #define _VM_OBJECT_ 71 72 #include <sys/queue.h> 73 #include <sys/_lock.h> 74 #include <sys/_mutex.h> 75 #include <sys/_pctrie.h> 76 #include <sys/_rwlock.h> 77 #include <sys/_domainset.h> 78 79 #include <vm/_vm_radix.h> 80 81 /* 82 * Types defined: 83 * 84 * vm_object_t Virtual memory object. 85 * 86 * List of locks 87 * (a) atomic 88 * (c) const until freed 89 * (o) per-object lock 90 * (f) free pages queue mutex 91 * 92 */ 93 94 #ifndef VM_PAGE_HAVE_PGLIST 95 TAILQ_HEAD(pglist, vm_page); 96 #define VM_PAGE_HAVE_PGLIST 97 #endif 98 99 struct vm_object { 100 struct rwlock lock; 101 TAILQ_ENTRY(vm_object) object_list; /* list of all objects */ 102 LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */ 103 LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */ 104 struct pglist memq; /* list of resident pages */ 105 struct vm_radix rtree; /* root of the resident page radix trie*/ 106 vm_pindex_t size; /* Object size */ 107 struct domainset_ref domain; /* NUMA policy. */ 108 volatile int generation; /* generation ID */ 109 int cleangeneration; /* Generation at clean time */ 110 volatile u_int ref_count; /* How many refs?? */ 111 int shadow_count; /* how many objects that this is a shadow for */ 112 vm_memattr_t memattr; /* default memory attribute for pages */ 113 objtype_t type; /* type of pager */ 114 u_short flags; /* see below */ 115 u_short pg_color; /* (c) color of first page in obj */ 116 volatile u_int paging_in_progress; /* Paging (in or out) so don't collapse or destroy */ 117 volatile u_int busy; /* (a) object is busy, disallow page busy. */ 118 int resident_page_count; /* number of resident pages */ 119 struct vm_object *backing_object; /* object that I'm a shadow of */ 120 vm_ooffset_t backing_object_offset;/* Offset in backing object */ 121 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */ 122 LIST_HEAD(, vm_reserv) rvq; /* list of reservations */ 123 void *handle; 124 union { 125 /* 126 * VNode pager 127 * 128 * vnp_size - current size of file 129 */ 130 struct { 131 off_t vnp_size; 132 vm_ooffset_t writemappings; 133 } vnp; 134 135 /* 136 * Device pager 137 * 138 * devp_pglist - list of allocated pages 139 */ 140 struct { 141 TAILQ_HEAD(, vm_page) devp_pglist; 142 struct cdev_pager_ops *ops; 143 struct cdev *dev; 144 } devp; 145 146 /* 147 * SG pager 148 * 149 * sgp_pglist - list of allocated pages 150 */ 151 struct { 152 TAILQ_HEAD(, vm_page) sgp_pglist; 153 } sgp; 154 155 /* 156 * Swap pager 157 * 158 * swp_tmpfs - back-pointer to the tmpfs vnode, 159 * if any, which uses the vm object 160 * as backing store. The handle 161 * cannot be reused for linking, 162 * because the vnode can be 163 * reclaimed and recreated, making 164 * the handle changed and hash-chain 165 * invalid. 166 * 167 * swp_blks - pc-trie of the allocated swap blocks. 168 * 169 */ 170 struct { 171 void *swp_tmpfs; 172 struct pctrie swp_blks; 173 vm_ooffset_t writemappings; 174 } swp; 175 } un_pager; 176 struct ucred *cred; 177 vm_ooffset_t charge; 178 void *umtx_data; 179 }; 180 181 /* 182 * Flags 183 */ 184 #define OBJ_FICTITIOUS 0x0001 /* (c) contains fictitious pages */ 185 #define OBJ_UNMANAGED 0x0002 /* (c) contains unmanaged pages */ 186 #define OBJ_POPULATE 0x0004 /* pager implements populate() */ 187 #define OBJ_DEAD 0x0008 /* dead objects (during rundown) */ 188 #define OBJ_ANON 0x0010 /* (c) contains anonymous memory */ 189 #define OBJ_UMTXDEAD 0x0020 /* umtx pshared was terminated */ 190 #define OBJ_SIZEVNLOCK 0x0040 /* lock vnode to check obj size */ 191 #define OBJ_PG_DTOR 0x0080 /* dont reset object, leave that for dtor */ 192 #define OBJ_TMPFS_NODE 0x0200 /* object belongs to tmpfs VREG node */ 193 #define OBJ_SPLIT 0x0400 /* object is being split */ 194 #define OBJ_COLLAPSING 0x0800 /* Parent of collapse. */ 195 #define OBJ_COLORED 0x1000 /* pg_color is defined */ 196 #define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */ 197 #define OBJ_SHADOWLIST 0x4000 /* Object is on the shadow list. */ 198 #define OBJ_TMPFS 0x8000 /* has tmpfs vnode allocated */ 199 200 /* 201 * Helpers to perform conversion between vm_object page indexes and offsets. 202 * IDX_TO_OFF() converts an index into an offset. 203 * OFF_TO_IDX() converts an offset into an index. 204 * OBJ_MAX_SIZE specifies the maximum page index corresponding to the 205 * maximum unsigned offset. 206 */ 207 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT) 208 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT)) 209 #define OBJ_MAX_SIZE (OFF_TO_IDX(UINT64_MAX) + 1) 210 211 #ifdef _KERNEL 212 213 #define OBJPC_SYNC 0x1 /* sync I/O */ 214 #define OBJPC_INVAL 0x2 /* invalidate */ 215 #define OBJPC_NOSYNC 0x4 /* skip if PGA_NOSYNC */ 216 217 /* 218 * The following options are supported by vm_object_page_remove(). 219 */ 220 #define OBJPR_CLEANONLY 0x1 /* Don't remove dirty pages. */ 221 #define OBJPR_NOTMAPPED 0x2 /* Don't unmap pages. */ 222 223 TAILQ_HEAD(object_q, vm_object); 224 225 extern struct object_q vm_object_list; /* list of allocated objects */ 226 extern struct mtx vm_object_list_mtx; /* lock for object list and count */ 227 228 extern struct vm_object kernel_object_store; 229 230 /* kernel and kmem are aliased for backwards KPI compat. */ 231 #define kernel_object (&kernel_object_store) 232 #define kmem_object (&kernel_object_store) 233 234 #define VM_OBJECT_ASSERT_LOCKED(object) \ 235 rw_assert(&(object)->lock, RA_LOCKED) 236 #define VM_OBJECT_ASSERT_RLOCKED(object) \ 237 rw_assert(&(object)->lock, RA_RLOCKED) 238 #define VM_OBJECT_ASSERT_WLOCKED(object) \ 239 rw_assert(&(object)->lock, RA_WLOCKED) 240 #define VM_OBJECT_ASSERT_UNLOCKED(object) \ 241 rw_assert(&(object)->lock, RA_UNLOCKED) 242 #define VM_OBJECT_LOCK_DOWNGRADE(object) \ 243 rw_downgrade(&(object)->lock) 244 #define VM_OBJECT_RLOCK(object) \ 245 rw_rlock(&(object)->lock) 246 #define VM_OBJECT_RUNLOCK(object) \ 247 rw_runlock(&(object)->lock) 248 #define VM_OBJECT_SLEEP(object, wchan, pri, wmesg, timo) \ 249 rw_sleep((wchan), &(object)->lock, (pri), (wmesg), (timo)) 250 #define VM_OBJECT_TRYRLOCK(object) \ 251 rw_try_rlock(&(object)->lock) 252 #define VM_OBJECT_TRYWLOCK(object) \ 253 rw_try_wlock(&(object)->lock) 254 #define VM_OBJECT_TRYUPGRADE(object) \ 255 rw_try_upgrade(&(object)->lock) 256 #define VM_OBJECT_WLOCK(object) \ 257 rw_wlock(&(object)->lock) 258 #define VM_OBJECT_WOWNED(object) \ 259 rw_wowned(&(object)->lock) 260 #define VM_OBJECT_WUNLOCK(object) \ 261 rw_wunlock(&(object)->lock) 262 #define VM_OBJECT_DROP(object) \ 263 lock_class_rw.lc_unlock(&(object)->lock.lock_object) 264 #define VM_OBJECT_PICKUP(object, state) \ 265 lock_class_rw.lc_lock(&(object)->lock.lock_object, (state)) 266 267 #define VM_OBJECT_ASSERT_PAGING(object) \ 268 KASSERT((object)->paging_in_progress != 0, \ 269 ("vm_object %p is not paging", object)) 270 #define VM_OBJECT_ASSERT_REFERENCE(object) \ 271 KASSERT((object)->reference_count != 0, \ 272 ("vm_object %p is not referenced", object)) 273 274 struct vnode; 275 276 /* 277 * The object must be locked or thread private. 278 */ 279 static __inline void 280 vm_object_set_flag(vm_object_t object, u_short bits) 281 { 282 283 object->flags |= bits; 284 } 285 286 /* 287 * Conditionally set the object's color, which (1) enables the allocation 288 * of physical memory reservations for anonymous objects and larger-than- 289 * superpage-sized named objects and (2) determines the first page offset 290 * within the object at which a reservation may be allocated. In other 291 * words, the color determines the alignment of the object with respect 292 * to the largest superpage boundary. When mapping named objects, like 293 * files or POSIX shared memory objects, the color should be set to zero 294 * before a virtual address is selected for the mapping. In contrast, 295 * for anonymous objects, the color may be set after the virtual address 296 * is selected. 297 * 298 * The object must be locked. 299 */ 300 static __inline void 301 vm_object_color(vm_object_t object, u_short color) 302 { 303 304 if ((object->flags & OBJ_COLORED) == 0) { 305 object->pg_color = color; 306 object->flags |= OBJ_COLORED; 307 } 308 } 309 310 static __inline bool 311 vm_object_reserv(vm_object_t object) 312 { 313 314 if (object != NULL && 315 (object->flags & (OBJ_COLORED | OBJ_FICTITIOUS)) == OBJ_COLORED) { 316 return (true); 317 } 318 return (false); 319 } 320 321 static __inline bool 322 vm_object_mightbedirty(vm_object_t object) 323 { 324 325 if (object->type != OBJT_VNODE) { 326 if ((object->flags & OBJ_TMPFS_NODE) == 0) 327 return (false); 328 #ifdef KASSERT 329 KASSERT(object->type == OBJT_SWAP, 330 ("TMPFS_NODE obj %p is not swap", object)); 331 #endif 332 } 333 return (object->generation != object->cleangeneration); 334 } 335 336 void vm_object_clear_flag(vm_object_t object, u_short bits); 337 void vm_object_pip_add(vm_object_t object, short i); 338 void vm_object_pip_wakeup(vm_object_t object); 339 void vm_object_pip_wakeupn(vm_object_t object, short i); 340 void vm_object_pip_wait(vm_object_t object, char *waitid); 341 void vm_object_pip_wait_unlocked(vm_object_t object, char *waitid); 342 343 void vm_object_busy(vm_object_t object); 344 void vm_object_unbusy(vm_object_t object); 345 void vm_object_busy_wait(vm_object_t object, const char *wmesg); 346 347 static inline bool 348 vm_object_busied(vm_object_t object) 349 { 350 351 return (object->busy != 0); 352 } 353 #define VM_OBJECT_ASSERT_BUSY(object) MPASS(vm_object_busied((object))) 354 355 void umtx_shm_object_init(vm_object_t object); 356 void umtx_shm_object_terminated(vm_object_t object); 357 extern int umtx_shm_vnobj_persistent; 358 359 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t); 360 vm_object_t vm_object_allocate_anon(vm_pindex_t, vm_object_t, struct ucred *, 361 vm_size_t); 362 boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t, 363 boolean_t); 364 void vm_object_collapse (vm_object_t); 365 void vm_object_deallocate (vm_object_t); 366 void vm_object_destroy (vm_object_t); 367 void vm_object_terminate (vm_object_t); 368 void vm_object_set_writeable_dirty (vm_object_t); 369 void vm_object_init (void); 370 int vm_object_kvme_type(vm_object_t object, struct vnode **vpp); 371 void vm_object_madvise(vm_object_t, vm_pindex_t, vm_pindex_t, int); 372 boolean_t vm_object_page_clean(vm_object_t object, vm_ooffset_t start, 373 vm_ooffset_t end, int flags); 374 void vm_object_page_noreuse(vm_object_t object, vm_pindex_t start, 375 vm_pindex_t end); 376 void vm_object_page_remove(vm_object_t object, vm_pindex_t start, 377 vm_pindex_t end, int options); 378 boolean_t vm_object_populate(vm_object_t, vm_pindex_t, vm_pindex_t); 379 void vm_object_print(long addr, boolean_t have_addr, long count, char *modif); 380 void vm_object_reference (vm_object_t); 381 void vm_object_reference_locked(vm_object_t); 382 int vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr); 383 void vm_object_shadow(vm_object_t *, vm_ooffset_t *, vm_size_t, struct ucred *, 384 bool); 385 void vm_object_split(vm_map_entry_t); 386 boolean_t vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t, 387 boolean_t); 388 void vm_object_unwire(vm_object_t object, vm_ooffset_t offset, 389 vm_size_t length, uint8_t queue); 390 struct vnode *vm_object_vnode(vm_object_t object); 391 #endif /* _KERNEL */ 392 393 #endif /* _VM_OBJECT_ */ 394