2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * The Mach Operating System project at Carnegie-Mellon University.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
34 * from: @(#)vm_object.h 8.3 (Berkeley) 1/12/94
37 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
38 * All rights reserved.
40 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
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.
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.
52 * Carnegie Mellon requests users of this software to return to
54 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
55 * School of Computer Science
56 * Carnegie Mellon University
57 * Pittsburgh PA 15213-3890
59 * any improvements or extensions that they make and grant Carnegie the
60 * rights to redistribute these changes.
66 * Virtual memory object module definitions.
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>
78 #include <vm/_vm_radix.h>
83 * vm_object_t Virtual memory object.
86 * (c) const until freed
88 * (f) free pages queue mutex
92 #ifndef VM_PAGE_HAVE_PGLIST
93 TAILQ_HEAD(pglist, vm_page);
94 #define VM_PAGE_HAVE_PGLIST
99 TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
100 LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
101 LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
102 struct pglist memq; /* list of resident pages */
103 struct vm_radix rtree; /* root of the resident page radix trie*/
104 vm_pindex_t size; /* Object size */
105 int generation; /* generation ID */
106 int ref_count; /* How many refs?? */
107 int shadow_count; /* how many objects that this is a shadow for */
108 vm_memattr_t memattr; /* default memory attribute for pages */
109 objtype_t type; /* type of pager */
110 u_short flags; /* see below */
111 u_short pg_color; /* (c) color of first page in obj */
112 u_int paging_in_progress; /* Paging (in or out) so don't collapse or destroy */
113 int resident_page_count; /* number of resident pages */
114 struct vm_object *backing_object; /* object that I'm a shadow of */
115 vm_ooffset_t backing_object_offset;/* Offset in backing object */
116 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
117 LIST_HEAD(, vm_reserv) rvq; /* list of reservations */
123 * vnp_size - current size of file
127 vm_ooffset_t writemappings;
133 * devp_pglist - list of allocated pages
136 TAILQ_HEAD(, vm_page) devp_pglist;
137 struct cdev_pager_ops *ops;
144 * sgp_pglist - list of allocated pages
147 TAILQ_HEAD(, vm_page) sgp_pglist;
153 * swp_tmpfs - back-pointer to the tmpfs vnode,
154 * if any, which uses the vm object
155 * as backing store. The handle
156 * cannot be reused for linking,
157 * because the vnode can be
158 * reclaimed and recreated, making
159 * the handle changed and hash-chain
162 * swp_blks - pc-trie of the allocated swap blocks.
167 struct pctrie swp_blks;
178 #define OBJ_FICTITIOUS 0x0001 /* (c) contains fictitious pages */
179 #define OBJ_UNMANAGED 0x0002 /* (c) contains unmanaged pages */
180 #define OBJ_POPULATE 0x0004 /* pager implements populate() */
181 #define OBJ_DEAD 0x0008 /* dead objects (during rundown) */
182 #define OBJ_NOSPLIT 0x0010 /* dont split this object */
183 #define OBJ_UMTXDEAD 0x0020 /* umtx pshared was terminated */
184 #define OBJ_PIPWNT 0x0040 /* paging in progress wanted */
185 #define OBJ_PG_DTOR 0x0080 /* dont reset object, leave that for dtor */
186 #define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty, only for vnode */
187 #define OBJ_TMPFS_NODE 0x0200 /* object belongs to tmpfs VREG node */
188 #define OBJ_TMPFS_DIRTY 0x0400 /* dirty tmpfs obj */
189 #define OBJ_COLORED 0x1000 /* pg_color is defined */
190 #define OBJ_ONEMAPPING 0x2000 /* One USE (a single, non-forked) mapping flag */
191 #define OBJ_DISCONNECTWNT 0x4000 /* disconnect from vnode wanted */
192 #define OBJ_TMPFS 0x8000 /* has tmpfs vnode allocated */
195 * Helpers to perform conversion between vm_object page indexes and offsets.
196 * IDX_TO_OFF() converts an index into an offset.
197 * OFF_TO_IDX() converts an offset into an index. Since offsets are signed
198 * by default, the sign propagation in OFF_TO_IDX(), when applied to
199 * negative offsets, is intentional and returns a vm_object page index
200 * that cannot be created by a userspace mapping.
201 * UOFF_TO_IDX() treats the offset as an unsigned value and converts it
202 * into an index accordingly. Use it only when the full range of offset
203 * values are allowed. Currently, this only applies to device mappings.
204 * OBJ_MAX_SIZE specifies the maximum page index corresponding to the
205 * maximum unsigned offset.
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 UOFF_TO_IDX(off) (((vm_pindex_t)(off)) >> PAGE_SHIFT)
210 #define OBJ_MAX_SIZE (UOFF_TO_IDX(UINT64_MAX) + 1)
214 #define OBJPC_SYNC 0x1 /* sync I/O */
215 #define OBJPC_INVAL 0x2 /* invalidate */
216 #define OBJPC_NOSYNC 0x4 /* skip if VPO_NOSYNC */
219 * The following options are supported by vm_object_page_remove().
221 #define OBJPR_CLEANONLY 0x1 /* Don't remove dirty pages. */
222 #define OBJPR_NOTMAPPED 0x2 /* Don't unmap pages. */
224 TAILQ_HEAD(object_q, vm_object);
226 extern struct object_q vm_object_list; /* list of allocated objects */
227 extern struct mtx vm_object_list_mtx; /* lock for object list and count */
229 extern struct vm_object kernel_object_store;
231 /* kernel and kmem are aliased for backwards KPI compat. */
232 #define kernel_object (&kernel_object_store)
233 #define kmem_object (&kernel_object_store)
235 #define VM_OBJECT_ASSERT_LOCKED(object) \
236 rw_assert(&(object)->lock, RA_LOCKED)
237 #define VM_OBJECT_ASSERT_RLOCKED(object) \
238 rw_assert(&(object)->lock, RA_RLOCKED)
239 #define VM_OBJECT_ASSERT_WLOCKED(object) \
240 rw_assert(&(object)->lock, RA_WLOCKED)
241 #define VM_OBJECT_ASSERT_UNLOCKED(object) \
242 rw_assert(&(object)->lock, RA_UNLOCKED)
243 #define VM_OBJECT_LOCK_DOWNGRADE(object) \
244 rw_downgrade(&(object)->lock)
245 #define VM_OBJECT_RLOCK(object) \
246 rw_rlock(&(object)->lock)
247 #define VM_OBJECT_RUNLOCK(object) \
248 rw_runlock(&(object)->lock)
249 #define VM_OBJECT_SLEEP(object, wchan, pri, wmesg, timo) \
250 rw_sleep((wchan), &(object)->lock, (pri), (wmesg), (timo))
251 #define VM_OBJECT_TRYRLOCK(object) \
252 rw_try_rlock(&(object)->lock)
253 #define VM_OBJECT_TRYWLOCK(object) \
254 rw_try_wlock(&(object)->lock)
255 #define VM_OBJECT_TRYUPGRADE(object) \
256 rw_try_upgrade(&(object)->lock)
257 #define VM_OBJECT_WLOCK(object) \
258 rw_wlock(&(object)->lock)
259 #define VM_OBJECT_WOWNED(object) \
260 rw_wowned(&(object)->lock)
261 #define VM_OBJECT_WUNLOCK(object) \
262 rw_wunlock(&(object)->lock)
265 * The object must be locked or thread private.
268 vm_object_set_flag(vm_object_t object, u_short bits)
271 object->flags |= bits;
275 * Conditionally set the object's color, which (1) enables the allocation
276 * of physical memory reservations for anonymous objects and larger-than-
277 * superpage-sized named objects and (2) determines the first page offset
278 * within the object at which a reservation may be allocated. In other
279 * words, the color determines the alignment of the object with respect
280 * to the largest superpage boundary. When mapping named objects, like
281 * files or POSIX shared memory objects, the color should be set to zero
282 * before a virtual address is selected for the mapping. In contrast,
283 * for anonymous objects, the color may be set after the virtual address
286 * The object must be locked.
289 vm_object_color(vm_object_t object, u_short color)
292 if ((object->flags & OBJ_COLORED) == 0) {
293 object->pg_color = color;
294 object->flags |= OBJ_COLORED;
298 void vm_object_clear_flag(vm_object_t object, u_short bits);
299 void vm_object_pip_add(vm_object_t object, short i);
300 void vm_object_pip_subtract(vm_object_t object, short i);
301 void vm_object_pip_wakeup(vm_object_t object);
302 void vm_object_pip_wakeupn(vm_object_t object, short i);
303 void vm_object_pip_wait(vm_object_t object, char *waitid);
305 void umtx_shm_object_init(vm_object_t object);
306 void umtx_shm_object_terminated(vm_object_t object);
307 extern int umtx_shm_vnobj_persistent;
309 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
310 boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t,
312 void vm_object_collapse (vm_object_t);
313 void vm_object_deallocate (vm_object_t);
314 void vm_object_destroy (vm_object_t);
315 void vm_object_terminate (vm_object_t);
316 void vm_object_set_writeable_dirty (vm_object_t);
317 void vm_object_init (void);
318 void vm_object_madvise(vm_object_t, vm_pindex_t, vm_pindex_t, int);
319 boolean_t vm_object_page_clean(vm_object_t object, vm_ooffset_t start,
320 vm_ooffset_t end, int flags);
321 void vm_object_page_noreuse(vm_object_t object, vm_pindex_t start,
323 void vm_object_page_remove(vm_object_t object, vm_pindex_t start,
324 vm_pindex_t end, int options);
325 boolean_t vm_object_populate(vm_object_t, vm_pindex_t, vm_pindex_t);
326 void vm_object_print(long addr, boolean_t have_addr, long count, char *modif);
327 void vm_object_reference (vm_object_t);
328 void vm_object_reference_locked(vm_object_t);
329 int vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr);
330 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
331 void vm_object_split(vm_map_entry_t);
332 boolean_t vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t,
334 void vm_object_unwire(vm_object_t object, vm_ooffset_t offset,
335 vm_size_t length, uint8_t queue);
336 struct vnode *vm_object_vnode(vm_object_t object);
339 #endif /* _VM_OBJECT_ */