vm_object.h revision 323537
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 * 4. 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_object.h 8.3 (Berkeley) 1/12/94 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: stable/11/sys/vm/vm_object.h 323537 2017-09-13 11:19:04Z kib $ 61 */ 62 63/* 64 * Virtual memory object module definitions. 65 */ 66 67#ifndef _VM_OBJECT_ 68#define _VM_OBJECT_ 69 70#include <sys/queue.h> 71#include <sys/_lock.h> 72#include <sys/_mutex.h> 73#include <sys/_pctrie.h> 74#include <sys/_rwlock.h> 75 76#include <vm/_vm_radix.h> 77 78/* 79 * Types defined: 80 * 81 * vm_object_t Virtual memory object. 82 * 83 * List of locks 84 * (c) const until freed 85 * (o) per-object lock 86 * (f) free pages queue mutex 87 * 88 */ 89 90struct vm_object { 91 struct rwlock lock; 92 TAILQ_ENTRY(vm_object) object_list; /* list of all objects */ 93 LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */ 94 LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */ 95 TAILQ_HEAD(respgs, vm_page) memq; /* list of resident pages */ 96 struct vm_radix rtree; /* root of the resident page radix trie*/ 97 vm_pindex_t size; /* Object size */ 98 int generation; /* generation ID */ 99 int ref_count; /* How many refs?? */ 100 int shadow_count; /* how many objects that this is a shadow for */ 101 vm_memattr_t memattr; /* default memory attribute for pages */ 102 objtype_t type; /* type of pager */ 103 u_short flags; /* see below */ 104 u_short pg_color; /* (c) color of first page in obj */ 105 u_int paging_in_progress; /* Paging (in or out) so don't collapse or destroy */ 106 int resident_page_count; /* number of resident pages */ 107 struct vm_object *backing_object; /* object that I'm a shadow of */ 108 vm_ooffset_t backing_object_offset;/* Offset in backing object */ 109 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */ 110 LIST_HEAD(, vm_reserv) rvq; /* list of reservations */ 111 void *handle; 112 union { 113 /* 114 * VNode pager 115 * 116 * vnp_size - current size of file 117 */ 118 struct { 119 off_t vnp_size; 120 vm_ooffset_t writemappings; 121 } vnp; 122 123 /* 124 * Device pager 125 * 126 * devp_pglist - list of allocated pages 127 */ 128 struct { 129 TAILQ_HEAD(, vm_page) devp_pglist; 130 struct cdev_pager_ops *ops; 131 struct cdev *dev; 132 } devp; 133 134 /* 135 * SG pager 136 * 137 * sgp_pglist - list of allocated pages 138 */ 139 struct { 140 TAILQ_HEAD(, vm_page) sgp_pglist; 141 } sgp; 142 143 /* 144 * Swap pager 145 * 146 * swp_tmpfs - back-pointer to the tmpfs vnode, 147 * if any, which uses the vm object 148 * as backing store. The handle 149 * cannot be reused for linking, 150 * because the vnode can be 151 * reclaimed and recreated, making 152 * the handle changed and hash-chain 153 * invalid. 154 * 155 * swp_blks - pc-trie of the allocated swap blocks. 156 * 157 */ 158 struct { 159 void *swp_tmpfs; 160 struct pctrie swp_blks; 161 } swp; 162 } un_pager; 163 struct ucred *cred; 164 vm_ooffset_t charge; 165 void *umtx_data; 166}; 167 168/* 169 * Flags 170 */ 171#define OBJ_FICTITIOUS 0x0001 /* (c) contains fictitious pages */ 172#define OBJ_UNMANAGED 0x0002 /* (c) contains unmanaged pages */ 173#define OBJ_POPULATE 0x0004 /* pager implements populate() */ 174#define OBJ_DEAD 0x0008 /* dead objects (during rundown) */ 175#define OBJ_NOSPLIT 0x0010 /* dont split this object */ 176#define OBJ_UMTXDEAD 0x0020 /* umtx pshared was terminated */ 177#define OBJ_PIPWNT 0x0040 /* paging in progress wanted */ 178#define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty, only for vnode */ 179#define OBJ_TMPFS_NODE 0x0200 /* object belongs to tmpfs VREG node */ 180#define OBJ_TMPFS_DIRTY 0x0400 /* dirty tmpfs obj */ 181#define OBJ_COLORED 0x1000 /* pg_color is defined */ 182#define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */ 183#define OBJ_DISCONNECTWNT 0x4000 /* disconnect from vnode wanted */ 184#define OBJ_TMPFS 0x8000 /* has tmpfs vnode allocated */ 185 186/* 187 * Helpers to perform conversion between vm_object page indexes and offsets. 188 * IDX_TO_OFF() converts an index into an offset. 189 * OFF_TO_IDX() converts an offset into an index. Since offsets are signed 190 * by default, the sign propagation in OFF_TO_IDX(), when applied to 191 * negative offsets, is intentional and returns a vm_object page index 192 * that cannot be created by a userspace mapping. 193 * UOFF_TO_IDX() treats the offset as an unsigned value and converts it 194 * into an index accordingly. Use it only when the full range of offset 195 * values are allowed. Currently, this only applies to device mappings. 196 * OBJ_MAX_SIZE specifies the maximum page index corresponding to the 197 * maximum unsigned offset. 198 */ 199#define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT) 200#define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT)) 201#define UOFF_TO_IDX(off) (((vm_pindex_t)(off)) >> PAGE_SHIFT) 202#define OBJ_MAX_SIZE (UOFF_TO_IDX(UINT64_MAX) + 1) 203 204#ifdef _KERNEL 205 206#define OBJPC_SYNC 0x1 /* sync I/O */ 207#define OBJPC_INVAL 0x2 /* invalidate */ 208#define OBJPC_NOSYNC 0x4 /* skip if VPO_NOSYNC */ 209 210/* 211 * The following options are supported by vm_object_page_remove(). 212 */ 213#define OBJPR_CLEANONLY 0x1 /* Don't remove dirty pages. */ 214#define OBJPR_NOTMAPPED 0x2 /* Don't unmap pages. */ 215 216TAILQ_HEAD(object_q, vm_object); 217 218extern struct object_q vm_object_list; /* list of allocated objects */ 219extern struct mtx vm_object_list_mtx; /* lock for object list and count */ 220 221extern struct vm_object kernel_object_store; 222extern struct vm_object kmem_object_store; 223 224#define kernel_object (&kernel_object_store) 225#define kmem_object (&kmem_object_store) 226 227#define VM_OBJECT_ASSERT_LOCKED(object) \ 228 rw_assert(&(object)->lock, RA_LOCKED) 229#define VM_OBJECT_ASSERT_RLOCKED(object) \ 230 rw_assert(&(object)->lock, RA_RLOCKED) 231#define VM_OBJECT_ASSERT_WLOCKED(object) \ 232 rw_assert(&(object)->lock, RA_WLOCKED) 233#define VM_OBJECT_ASSERT_UNLOCKED(object) \ 234 rw_assert(&(object)->lock, RA_UNLOCKED) 235#define VM_OBJECT_LOCK_DOWNGRADE(object) \ 236 rw_downgrade(&(object)->lock) 237#define VM_OBJECT_RLOCK(object) \ 238 rw_rlock(&(object)->lock) 239#define VM_OBJECT_RUNLOCK(object) \ 240 rw_runlock(&(object)->lock) 241#define VM_OBJECT_SLEEP(object, wchan, pri, wmesg, timo) \ 242 rw_sleep((wchan), &(object)->lock, (pri), (wmesg), (timo)) 243#define VM_OBJECT_TRYRLOCK(object) \ 244 rw_try_rlock(&(object)->lock) 245#define VM_OBJECT_TRYWLOCK(object) \ 246 rw_try_wlock(&(object)->lock) 247#define VM_OBJECT_TRYUPGRADE(object) \ 248 rw_try_upgrade(&(object)->lock) 249#define VM_OBJECT_WLOCK(object) \ 250 rw_wlock(&(object)->lock) 251#define VM_OBJECT_WOWNED(object) \ 252 rw_wowned(&(object)->lock) 253#define VM_OBJECT_WUNLOCK(object) \ 254 rw_wunlock(&(object)->lock) 255 256/* 257 * The object must be locked or thread private. 258 */ 259static __inline void 260vm_object_set_flag(vm_object_t object, u_short bits) 261{ 262 263 object->flags |= bits; 264} 265 266/* 267 * Conditionally set the object's color, which (1) enables the allocation 268 * of physical memory reservations for anonymous objects and larger-than- 269 * superpage-sized named objects and (2) determines the first page offset 270 * within the object at which a reservation may be allocated. In other 271 * words, the color determines the alignment of the object with respect 272 * to the largest superpage boundary. When mapping named objects, like 273 * files or POSIX shared memory objects, the color should be set to zero 274 * before a virtual address is selected for the mapping. In contrast, 275 * for anonymous objects, the color may be set after the virtual address 276 * is selected. 277 * 278 * The object must be locked. 279 */ 280static __inline void 281vm_object_color(vm_object_t object, u_short color) 282{ 283 284 if ((object->flags & OBJ_COLORED) == 0) { 285 object->pg_color = color; 286 object->flags |= OBJ_COLORED; 287 } 288} 289 290void vm_object_clear_flag(vm_object_t object, u_short bits); 291void vm_object_pip_add(vm_object_t object, short i); 292void vm_object_pip_subtract(vm_object_t object, short i); 293void vm_object_pip_wakeup(vm_object_t object); 294void vm_object_pip_wakeupn(vm_object_t object, short i); 295void vm_object_pip_wait(vm_object_t object, char *waitid); 296 297void umtx_shm_object_init(vm_object_t object); 298void umtx_shm_object_terminated(vm_object_t object); 299extern int umtx_shm_vnobj_persistent; 300 301vm_object_t vm_object_allocate (objtype_t, vm_pindex_t); 302boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t, 303 boolean_t); 304void vm_object_collapse (vm_object_t); 305void vm_object_deallocate (vm_object_t); 306void vm_object_destroy (vm_object_t); 307void vm_object_terminate (vm_object_t); 308void vm_object_set_writeable_dirty (vm_object_t); 309void vm_object_init (void); 310void vm_object_madvise(vm_object_t, vm_pindex_t, vm_pindex_t, int); 311boolean_t vm_object_page_clean(vm_object_t object, vm_ooffset_t start, 312 vm_ooffset_t end, int flags); 313void vm_object_page_noreuse(vm_object_t object, vm_pindex_t start, 314 vm_pindex_t end); 315void vm_object_page_remove(vm_object_t object, vm_pindex_t start, 316 vm_pindex_t end, int options); 317boolean_t vm_object_populate(vm_object_t, vm_pindex_t, vm_pindex_t); 318void vm_object_print(long addr, boolean_t have_addr, long count, char *modif); 319void vm_object_reference (vm_object_t); 320void vm_object_reference_locked(vm_object_t); 321int vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr); 322void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t); 323void vm_object_split(vm_map_entry_t); 324boolean_t vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t, 325 boolean_t); 326void vm_object_unwire(vm_object_t object, vm_ooffset_t offset, 327 vm_size_t length, uint8_t queue); 328struct vnode *vm_object_vnode(vm_object_t object); 329#endif /* _KERNEL */ 330 331#endif /* _VM_OBJECT_ */ 332