uvm_object.c revision 1.11.2.3 1 1.11.2.1 yamt /* $NetBSD: uvm_object.c,v 1.11.2.3 2011/11/26 15:19:06 yamt Exp $ */
2 1.1 yamt
3 1.1 yamt /*
4 1.8 rmind * Copyright (c) 2006, 2010 The NetBSD Foundation, Inc.
5 1.1 yamt * All rights reserved.
6 1.1 yamt *
7 1.3 rmind * This code is derived from software contributed to The NetBSD Foundation
8 1.3 rmind * by Mindaugas Rasiukevicius.
9 1.3 rmind *
10 1.1 yamt * Redistribution and use in source and binary forms, with or without
11 1.1 yamt * modification, are permitted provided that the following conditions
12 1.1 yamt * are met:
13 1.1 yamt * 1. Redistributions of source code must retain the above copyright
14 1.1 yamt * notice, this list of conditions and the following disclaimer.
15 1.1 yamt * 2. Redistributions in binary form must reproduce the above copyright
16 1.1 yamt * notice, this list of conditions and the following disclaimer in the
17 1.1 yamt * documentation and/or other materials provided with the distribution.
18 1.1 yamt *
19 1.1 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 1.1 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 1.1 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 1.1 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 1.1 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 1.1 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 1.1 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 1.1 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 1.1 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 1.1 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 1.1 yamt * POSSIBILITY OF SUCH DAMAGE.
30 1.1 yamt */
31 1.1 yamt
32 1.1 yamt /*
33 1.1 yamt * uvm_object.c: operate with memory objects
34 1.1 yamt *
35 1.1 yamt * TODO:
36 1.1 yamt * 1. Support PG_RELEASED-using objects
37 1.1 yamt */
38 1.1 yamt
39 1.1 yamt #include <sys/cdefs.h>
40 1.11.2.1 yamt __KERNEL_RCSID(0, "$NetBSD: uvm_object.c,v 1.11.2.3 2011/11/26 15:19:06 yamt Exp $");
41 1.1 yamt
42 1.7 thorpej #include "opt_ddb.h"
43 1.1 yamt
44 1.1 yamt #include <sys/param.h>
45 1.8 rmind #include <sys/mutex.h>
46 1.8 rmind #include <sys/queue.h>
47 1.8 rmind #include <sys/rbtree.h>
48 1.1 yamt
49 1.1 yamt #include <uvm/uvm.h>
50 1.7 thorpej #include <uvm/uvm_ddb.h>
51 1.11.2.2 yamt #include <uvm/uvm_page_array.h>
52 1.1 yamt
53 1.8 rmind /* Page count to fetch per single step. */
54 1.8 rmind #define FETCH_PAGECOUNT 16
55 1.8 rmind
56 1.8 rmind /*
57 1.8 rmind * uvm_obj_init: initialize UVM memory object.
58 1.8 rmind */
59 1.8 rmind void
60 1.8 rmind uvm_obj_init(struct uvm_object *uo, const struct uvm_pagerops *ops,
61 1.8 rmind bool alock, u_int refs)
62 1.8 rmind {
63 1.8 rmind
64 1.8 rmind if (alock) {
65 1.8 rmind /* Allocate and assign a lock. */
66 1.8 rmind uo->vmobjlock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
67 1.8 rmind } else {
68 1.8 rmind /* The lock will need to be set via uvm_obj_setlock(). */
69 1.8 rmind uo->vmobjlock = NULL;
70 1.8 rmind }
71 1.8 rmind uo->pgops = ops;
72 1.8 rmind LIST_INIT(&uo->uo_ubc);
73 1.8 rmind uo->uo_npages = 0;
74 1.8 rmind uo->uo_refs = refs;
75 1.11.2.1 yamt radix_tree_init_tree(&uo->uo_pages);
76 1.8 rmind }
77 1.8 rmind
78 1.8 rmind /*
79 1.8 rmind * uvm_obj_destroy: destroy UVM memory object.
80 1.8 rmind */
81 1.8 rmind void
82 1.8 rmind uvm_obj_destroy(struct uvm_object *uo, bool dlock)
83 1.8 rmind {
84 1.8 rmind
85 1.11.2.1 yamt KASSERT(radix_tree_empty_tree_p(&uo->uo_pages));
86 1.8 rmind
87 1.10 rmind /* Purge any UBC entries associated with this object. */
88 1.10 rmind ubc_purge(uo);
89 1.10 rmind
90 1.8 rmind /* Destroy the lock, if requested. */
91 1.8 rmind if (dlock) {
92 1.8 rmind mutex_obj_free(uo->vmobjlock);
93 1.8 rmind }
94 1.11.2.1 yamt radix_tree_fini_tree(&uo->uo_pages);
95 1.8 rmind }
96 1.8 rmind
97 1.8 rmind /*
98 1.8 rmind * uvm_obj_setlock: assign a vmobjlock to the UVM object.
99 1.8 rmind *
100 1.8 rmind * => Caller is responsible to ensure that UVM objects is not use.
101 1.8 rmind * => Only dynamic lock may be previously set. We drop the reference then.
102 1.8 rmind */
103 1.8 rmind void
104 1.8 rmind uvm_obj_setlock(struct uvm_object *uo, kmutex_t *lockptr)
105 1.8 rmind {
106 1.8 rmind kmutex_t *olockptr = uo->vmobjlock;
107 1.8 rmind
108 1.8 rmind if (olockptr) {
109 1.8 rmind /* Drop the reference on the old lock. */
110 1.8 rmind mutex_obj_free(olockptr);
111 1.8 rmind }
112 1.8 rmind if (lockptr == NULL) {
113 1.8 rmind /* If new lock is not passed - allocate default one. */
114 1.8 rmind lockptr = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
115 1.8 rmind }
116 1.8 rmind uo->vmobjlock = lockptr;
117 1.8 rmind }
118 1.1 yamt
119 1.1 yamt /*
120 1.8 rmind * uvm_obj_wirepages: wire the pages of entire UVM object.
121 1.1 yamt *
122 1.1 yamt * => NOTE: this function should only be used for types of objects
123 1.1 yamt * where PG_RELEASED flag is never set (aobj objects)
124 1.1 yamt * => caller must pass page-aligned start and end values
125 1.1 yamt */
126 1.1 yamt int
127 1.11 christos uvm_obj_wirepages(struct uvm_object *uobj, off_t start, off_t end,
128 1.11 christos struct pglist *list)
129 1.1 yamt {
130 1.1 yamt int i, npages, error;
131 1.1 yamt struct vm_page *pgs[FETCH_PAGECOUNT], *pg = NULL;
132 1.1 yamt off_t offset = start, left;
133 1.1 yamt
134 1.1 yamt left = (end - start) >> PAGE_SHIFT;
135 1.1 yamt
136 1.8 rmind mutex_enter(uobj->vmobjlock);
137 1.1 yamt while (left) {
138 1.1 yamt
139 1.1 yamt npages = MIN(FETCH_PAGECOUNT, left);
140 1.1 yamt
141 1.1 yamt /* Get the pages */
142 1.1 yamt memset(pgs, 0, sizeof(pgs));
143 1.1 yamt error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, 0,
144 1.1 yamt VM_PROT_READ | VM_PROT_WRITE, UVM_ADV_SEQUENTIAL,
145 1.1 yamt PGO_ALLPAGES | PGO_SYNCIO);
146 1.1 yamt
147 1.1 yamt if (error)
148 1.1 yamt goto error;
149 1.1 yamt
150 1.8 rmind mutex_enter(uobj->vmobjlock);
151 1.1 yamt for (i = 0; i < npages; i++) {
152 1.1 yamt
153 1.1 yamt KASSERT(pgs[i] != NULL);
154 1.1 yamt KASSERT(!(pgs[i]->flags & PG_RELEASED));
155 1.1 yamt
156 1.1 yamt /*
157 1.1 yamt * Loan break
158 1.1 yamt */
159 1.1 yamt if (pgs[i]->loan_count) {
160 1.1 yamt while (pgs[i]->loan_count) {
161 1.1 yamt pg = uvm_loanbreak(pgs[i]);
162 1.1 yamt if (!pg) {
163 1.8 rmind mutex_exit(uobj->vmobjlock);
164 1.1 yamt uvm_wait("uobjwirepg");
165 1.8 rmind mutex_enter(uobj->vmobjlock);
166 1.1 yamt continue;
167 1.1 yamt }
168 1.1 yamt }
169 1.1 yamt pgs[i] = pg;
170 1.1 yamt }
171 1.1 yamt
172 1.1 yamt if (pgs[i]->pqflags & PQ_AOBJ) {
173 1.11.2.1 yamt uvm_pagemarkdirty(pgs[i],
174 1.11.2.1 yamt UVM_PAGE_STATUS_DIRTY);
175 1.1 yamt uao_dropswap(uobj, i);
176 1.1 yamt }
177 1.1 yamt }
178 1.1 yamt
179 1.1 yamt /* Wire the pages */
180 1.4 ad mutex_enter(&uvm_pageqlock);
181 1.1 yamt for (i = 0; i < npages; i++) {
182 1.1 yamt uvm_pagewire(pgs[i]);
183 1.11 christos if (list != NULL)
184 1.11 christos TAILQ_INSERT_TAIL(list, pgs[i], pageq.queue);
185 1.1 yamt }
186 1.4 ad mutex_exit(&uvm_pageqlock);
187 1.1 yamt
188 1.1 yamt /* Unbusy the pages */
189 1.1 yamt uvm_page_unbusy(pgs, npages);
190 1.1 yamt
191 1.1 yamt left -= npages;
192 1.1 yamt offset += npages << PAGE_SHIFT;
193 1.1 yamt }
194 1.8 rmind mutex_exit(uobj->vmobjlock);
195 1.1 yamt
196 1.1 yamt return 0;
197 1.1 yamt
198 1.1 yamt error:
199 1.1 yamt /* Unwire the pages which has been wired */
200 1.8 rmind uvm_obj_unwirepages(uobj, start, offset);
201 1.1 yamt
202 1.1 yamt return error;
203 1.1 yamt }
204 1.1 yamt
205 1.1 yamt /*
206 1.8 rmind * uvm_obj_unwirepages: unwire the pages of entire UVM object.
207 1.1 yamt *
208 1.1 yamt * => NOTE: this function should only be used for types of objects
209 1.1 yamt * where PG_RELEASED flag is never set
210 1.1 yamt * => caller must pass page-aligned start and end values
211 1.1 yamt */
212 1.1 yamt void
213 1.8 rmind uvm_obj_unwirepages(struct uvm_object *uobj, off_t start, off_t end)
214 1.1 yamt {
215 1.1 yamt struct vm_page *pg;
216 1.1 yamt off_t offset;
217 1.1 yamt
218 1.8 rmind mutex_enter(uobj->vmobjlock);
219 1.4 ad mutex_enter(&uvm_pageqlock);
220 1.1 yamt for (offset = start; offset < end; offset += PAGE_SIZE) {
221 1.1 yamt pg = uvm_pagelookup(uobj, offset);
222 1.1 yamt
223 1.1 yamt KASSERT(pg != NULL);
224 1.1 yamt KASSERT(!(pg->flags & PG_RELEASED));
225 1.1 yamt
226 1.1 yamt uvm_pageunwire(pg);
227 1.1 yamt }
228 1.4 ad mutex_exit(&uvm_pageqlock);
229 1.8 rmind mutex_exit(uobj->vmobjlock);
230 1.1 yamt }
231 1.7 thorpej
232 1.9 mrg #if (defined(DDB) || defined(DEBUGPRINT)) && !defined(_RUMPKERNEL)
233 1.7 thorpej
234 1.7 thorpej /*
235 1.7 thorpej * uvm_object_printit: actually prints the object
236 1.7 thorpej */
237 1.7 thorpej void
238 1.7 thorpej uvm_object_printit(struct uvm_object *uobj, bool full,
239 1.7 thorpej void (*pr)(const char *, ...))
240 1.7 thorpej {
241 1.11.2.2 yamt struct uvm_page_array a;
242 1.7 thorpej struct vm_page *pg;
243 1.7 thorpej int cnt = 0;
244 1.11.2.2 yamt voff_t off;
245 1.7 thorpej
246 1.7 thorpej (*pr)("OBJECT %p: locked=%d, pgops=%p, npages=%d, ",
247 1.8 rmind uobj, mutex_owned(uobj->vmobjlock), uobj->pgops, uobj->uo_npages);
248 1.7 thorpej if (UVM_OBJ_IS_KERN_OBJECT(uobj))
249 1.7 thorpej (*pr)("refs=<SYSTEM>\n");
250 1.7 thorpej else
251 1.7 thorpej (*pr)("refs=%d\n", uobj->uo_refs);
252 1.7 thorpej
253 1.7 thorpej if (!full) {
254 1.7 thorpej return;
255 1.7 thorpej }
256 1.7 thorpej (*pr)(" PAGES <pg,offset>:\n ");
257 1.11.2.2 yamt uvm_page_array_init(&a);
258 1.11.2.2 yamt off = 0;
259 1.11.2.3 yamt while ((pg = uvm_page_array_fill_and_peek(&a, uobj, off, 0, 0))
260 1.11.2.2 yamt != NULL) {
261 1.7 thorpej cnt++;
262 1.7 thorpej (*pr)("<%p,0x%llx> ", pg, (long long)pg->offset);
263 1.7 thorpej if ((cnt % 3) == 0) {
264 1.7 thorpej (*pr)("\n ");
265 1.7 thorpej }
266 1.11.2.2 yamt off = pg->offset + PAGE_SIZE;
267 1.11.2.2 yamt uvm_page_array_advance(&a);
268 1.7 thorpej }
269 1.7 thorpej if ((cnt % 3) != 0) {
270 1.7 thorpej (*pr)("\n");
271 1.7 thorpej }
272 1.11.2.2 yamt uvm_page_array_fini(&a);
273 1.7 thorpej }
274 1.7 thorpej
275 1.7 thorpej #endif /* DDB || DEBUGPRINT */
276