2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * The Mach Operating System project at Carnegie-Mellon University.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
32 * from: @(#)vm_object.h 8.3 (Berkeley) 1/12/94
35 * Copyright (c) 1987, 1990 Carnegie-Mellon University.
36 * All rights reserved.
38 * Authors: Avadis Tevanian, Jr., Michael Wayne Young
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.
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.
50 * Carnegie Mellon requests users of this software to return to
52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
53 * School of Computer Science
54 * Carnegie Mellon University
55 * Pittsburgh PA 15213-3890
57 * any improvements or extensions that they make and grant Carnegie the
58 * rights to redistribute these changes.
60 * $FreeBSD: src/sys/vm/vm_object.h,v 1.63.2.3 2003/05/26 19:17:56 alc Exp $
64 * Virtual memory object module definitions.
67 #ifndef _VM_VM_OBJECT_H_
68 #define _VM_VM_OBJECT_H_
71 #include <sys/types.h>
73 #if defined(_KERNEL) && !defined(_SYS_SYSTM_H_)
74 #include <sys/systm.h>
77 #include <sys/queue.h>
82 #ifndef _SYS_THREAD_H_
83 #include <sys/thread.h>
85 #ifndef _MACHINE_PMAP_H_
86 #include <machine/pmap.h>
88 #ifndef _CPU_ATOMIC_H_
89 #include <machine/atomic.h>
94 #ifndef _VM_VM_PAGE_H_
95 #include <vm/vm_page.h>
100 #ifndef _SYS_REFCOUNT_H_
101 #include <sys/refcount.h>
107 struct swblock_rb_tree;
108 int rb_swblock_compare(struct swblock *, struct swblock *);
110 RB_PROTOTYPE2(swblock_rb_tree, swblock, swb_entry, rb_swblock_compare,
115 OBJT_SWAP, /* object backed by swap blocks */
116 OBJT_VNODE, /* object backed by file pages (vnode) */
117 OBJT_DEVICE, /* object backed by device pages */
119 OBJT_PHYS, /* object backed by physical pages */
120 OBJT_DEAD, /* dead object */
121 OBJT_MARKER /* marker object */
123 typedef u_char objtype_t;
126 * A VM object which represents an arbitrarily sized data store.
129 * shadow_head is only used by OBJT_DEFAULT or OBJT_SWAP objects.
130 * OBJT_VNODE objects explicitly do not keep track of who is shadowing
134 * vmobj_tokens[n] for object_list, hashed by address.
136 * vm_object_hold/drop() for most vm_object related operations.
137 * OBJ_CHAINLOCK to avoid chain/shadow object collisions.
140 TAILQ_ENTRY(vm_object) object_list; /* locked by vmobj_tokens[n] */
141 LIST_HEAD(, vm_object) shadow_head; /* objects we are a shadow for */
142 LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
143 RB_HEAD(vm_page_rb_tree, vm_page) rb_memq; /* resident pages */
144 int generation; /* generation ID */
145 vm_pindex_t size; /* Object size */
147 int shadow_count; /* count of objs we are a shadow for */
148 vm_memattr_t memattr; /* default memory attribute for pages */
149 objtype_t type; /* type of pager */
150 u_short flags; /* see below */
151 u_short pg_color; /* color of first page in obj */
152 u_int paging_in_progress; /* Paging (in or out) so don't collapse or destroy */
153 long resident_page_count; /* number of resident pages */
155 struct vm_object *backing_object; /* object that I'm a shadow of */
156 vm_ooffset_t backing_object_offset;/* Offset in backing object */
157 TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
158 void *handle; /* control handle: vp, etc */
159 int hold_count; /* count prevents destruction */
161 #if defined(DEBUG_LOCKS)
163 * Record threads holding a vm_object
166 #define VMOBJ_DEBUG_ARRAY_SIZE (32)
167 char debug_hold_thrs[VMOBJ_DEBUG_ARRAY_SIZE][64];
168 const char *debug_hold_file[VMOBJ_DEBUG_ARRAY_SIZE];
169 int debug_hold_line[VMOBJ_DEBUG_ARRAY_SIZE];
177 * devp_pglist - list of allocated pages
180 TAILQ_HEAD(, vm_page) devp_pglist;
181 struct cdev_pager_ops *ops;
187 * OBJT_SWAP and OBJT_VNODE VM objects may have swap backing
188 * store. For vnodes the swap backing store acts as a fast
189 * data cache but the vnode contains the official data.
191 RB_HEAD(swblock_rb_tree, swblock) swblock_root;
193 struct lwkt_token token;
194 struct md_object md; /* machine specific (typ pmap) */
195 uint32_t chainlk;/* chaining lock */
201 * OBJ_ONEMAPPING - Only applies to DEFAULT and SWAP objects. It may be
202 * gratuitously re-cleared in other cases but will already
203 * be clear in those cases. It might not be set on other
204 * object types (particularly OBJT_VNODE).
206 * This flag indicates that any given page index within the
207 * object is only mapped to a single vm_map_entry. Split
208 * vm_map_entry's (denoting distinct non-overlapping page
209 * ranges) do not clear this flag. This flag is typically
212 * OBJ_NOPAGEIN - vn and tmpfs set this flag, indicating to swapoff
213 * that the objects aren't intended to have any vm_page's,
214 * only swap blocks. vn and tmpfs don't know how to deal
215 * with any actual pages.
217 #define OBJ_UNUSED0001 0x0001 /* backing_object/shadow changing */
218 #define OBJ_ONSHADOW 0x0002 /* backing_object on shadow list */
219 #define OBJ_ACTIVE 0x0004 /* active objects */
220 #define OBJ_DEAD 0x0008 /* dead objects (during rundown) */
221 #define OBJ_NOSPLIT 0x0010 /* dont split this object */
222 #define OBJ_NOPAGEIN 0x0040 /* special OBJT_SWAP */
223 #define OBJ_WRITEABLE 0x0080 /* object has been made writable */
224 #define OBJ_MIGHTBEDIRTY 0x0100 /* object might be dirty */
225 #define OBJ_CLEANING 0x0200
226 #define OBJ_DEADWNT 0x1000 /* waiting because object is dead */
227 #define OBJ_ONEMAPPING 0x2000
228 #define OBJ_NOMSYNC 0x4000 /* disable msync() system call */
230 #define CHAINLK_EXCL 0x80000000
231 #define CHAINLK_WAIT 0x40000000
232 #define CHAINLK_EXCLREQ 0x20000000
233 #define CHAINLK_MASK 0x1FFFFFFF
235 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
236 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
238 #define VMOBJ_HSIZE 256
239 #define VMOBJ_HMASK (VMOBJ_HSIZE - 1)
243 #define OBJPC_SYNC 0x1 /* sync I/O */
244 #define OBJPC_INVAL 0x2 /* invalidate */
245 #define OBJPC_NOSYNC 0x4 /* skip if PG_NOSYNC */
248 * Used to chain vm_object deallocations
250 struct vm_object_dealloc_list {
251 struct vm_object_dealloc_list *next;
255 TAILQ_HEAD(object_q, vm_object);
257 struct vm_object_hash {
258 struct object_q list;
259 struct lwkt_token token;
262 extern struct vm_object_hash vm_object_hash[VMOBJ_HSIZE];
264 /* lock for object list and count */
266 extern struct vm_object kernel_object; /* the single kernel object */
267 extern int vm_shared_fault;
273 #define VM_OBJECT_LOCK(object) vm_object_hold(object)
274 #define VM_OBJECT_UNLOCK(object) vm_object_drop(object)
277 vm_object_set_flag(vm_object_t object, u_int bits)
279 atomic_set_short(&object->flags, bits);
283 vm_object_clear_flag(vm_object_t object, u_int bits)
285 atomic_clear_short(&object->flags, bits);
289 vm_object_pip_add(vm_object_t object, u_int i)
291 refcount_acquire_n(&object->paging_in_progress, i);
295 vm_object_pip_wakeup_n(vm_object_t object, u_int i)
297 refcount_release_wakeup_n(&object->paging_in_progress, i);
301 vm_object_pip_wakeup(vm_object_t object)
303 vm_object_pip_wakeup_n(object, 1);
307 vm_object_pip_wait(vm_object_t object, char *waitid)
309 refcount_wait(&object->paging_in_progress, waitid);
312 static __inline lwkt_token_t
313 vm_object_token(vm_object_t obj)
315 return (&obj->token);
318 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
319 vm_object_t vm_object_allocate_hold (objtype_t, vm_pindex_t);
320 void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t);
321 boolean_t vm_object_coalesce (vm_object_t, vm_pindex_t, vm_size_t, vm_size_t);
322 void vm_object_collapse (vm_object_t, struct vm_object_dealloc_list **);
323 void vm_object_deallocate_list(struct vm_object_dealloc_list **);
324 void vm_object_terminate (vm_object_t);
325 void vm_object_set_writeable_dirty (vm_object_t);
326 void vm_object_init(vm_object_t, vm_pindex_t);
327 void vm_object_init1 (void);
328 void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, int);
329 void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
330 void vm_object_pmap_copy (vm_object_t, vm_pindex_t, vm_pindex_t);
331 void vm_object_pmap_copy_1 (vm_object_t, vm_pindex_t, vm_pindex_t);
332 void vm_object_pmap_remove (vm_object_t, vm_pindex_t, vm_pindex_t);
333 void vm_object_chain_wait (vm_object_t object, int shared);
334 void vm_object_chain_acquire(vm_object_t object, int shared);
335 void vm_object_chain_release(vm_object_t object);
336 void vm_object_chain_release_all(vm_object_t object, vm_object_t stopobj);
337 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t, int);
338 void vm_object_madvise (vm_object_t, vm_pindex_t, vm_pindex_t, int);
339 void vm_object_init2 (void);
340 vm_page_t vm_fault_object_page(vm_object_t, vm_ooffset_t,
341 vm_prot_t, int, int *, int *);
342 void vm_object_lock_swap(void);
343 void vm_object_lock(vm_object_t);
344 void vm_object_lock_shared(vm_object_t);
345 void vm_object_unlock(vm_object_t);
347 #if defined(DEBUG_LOCKS)
349 #define VMOBJDEBUG(x) debug ## x
350 #define VMOBJDBARGS , char *file, int line
351 #define VMOBJDBFWD , file, line
353 #define vm_object_hold(obj) \
354 debugvm_object_hold(obj, __FILE__, __LINE__)
355 #define vm_object_hold_try(obj) \
356 debugvm_object_hold_try(obj, __FILE__, __LINE__)
357 #define vm_object_hold_shared(obj) \
358 debugvm_object_hold_shared(obj, __FILE__, __LINE__)
359 #define vm_object_drop(obj) \
360 debugvm_object_drop(obj, __FILE__, __LINE__)
361 #define vm_object_reference_quick(obj) \
362 debugvm_object_reference_quick(obj, __FILE__, __LINE__)
363 #define vm_object_reference_locked(obj) \
364 debugvm_object_reference_locked(obj, __FILE__, __LINE__)
365 #define vm_object_reference_locked_chain_held(obj) \
366 debugvm_object_reference_locked_chain_held( \
367 obj, __FILE__, __LINE__)
368 #define vm_object_deallocate(obj) \
369 debugvm_object_deallocate(obj, __FILE__, __LINE__)
370 #define vm_object_deallocate_locked(obj) \
371 debugvm_object_deallocate_locked(obj, __FILE__, __LINE__)
375 #define VMOBJDEBUG(x) x
381 void VMOBJDEBUG(vm_object_hold)(vm_object_t object VMOBJDBARGS);
382 int VMOBJDEBUG(vm_object_hold_try)(vm_object_t object VMOBJDBARGS);
383 void VMOBJDEBUG(vm_object_hold_shared)(vm_object_t object VMOBJDBARGS);
384 void VMOBJDEBUG(vm_object_drop)(vm_object_t object VMOBJDBARGS);
385 void VMOBJDEBUG(vm_object_reference_quick)(vm_object_t object VMOBJDBARGS);
386 void VMOBJDEBUG(vm_object_reference_locked)(vm_object_t object VMOBJDBARGS);
387 void VMOBJDEBUG(vm_object_reference_locked_chain_held)(
388 vm_object_t object VMOBJDBARGS);
389 void VMOBJDEBUG(vm_object_deallocate)(vm_object_t object VMOBJDBARGS);
390 void VMOBJDEBUG(vm_object_deallocate_locked)(vm_object_t object VMOBJDBARGS);
392 void vm_object_upgrade(vm_object_t);
393 void vm_object_downgrade(vm_object_t);
397 #endif /* _VM_VM_OBJECT_H_ */