sg_pager.c (9b4fcf851a73554063d4a2de9a4f10cd23a0a4f6) sg_pager.c (10cf25607484ea85dc2fe22b20e08b824f91a45a)
1/*-
2 * Copyright (c) 2009 Advanced Computing Technologies LLC
3 * Written by: John H. Baldwin <jhb@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:

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38#include <sys/mutex.h>
39#include <sys/sglist.h>
40#include <vm/vm.h>
41#include <vm/vm_object.h>
42#include <vm/vm_page.h>
43#include <vm/vm_pager.h>
44#include <vm/uma.h>
45
1/*-
2 * Copyright (c) 2009 Advanced Computing Technologies LLC
3 * Written by: John H. Baldwin <jhb@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:

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38#include <sys/mutex.h>
39#include <sys/sglist.h>
40#include <vm/vm.h>
41#include <vm/vm_object.h>
42#include <vm/vm_page.h>
43#include <vm/vm_pager.h>
44#include <vm/uma.h>
45
46static void sg_pager_init(void);
47static vm_object_t sg_pager_alloc(void *, vm_ooffset_t, vm_prot_t,
48 vm_ooffset_t, struct ucred *);
49static void sg_pager_dealloc(vm_object_t);
50static int sg_pager_getpages(vm_object_t, vm_page_t *, int, int);
51static void sg_pager_putpages(vm_object_t, vm_page_t *, int,
52 boolean_t, int *);
53static boolean_t sg_pager_haspage(vm_object_t, vm_pindex_t, int *,
54 int *);
55
46static vm_object_t sg_pager_alloc(void *, vm_ooffset_t, vm_prot_t,
47 vm_ooffset_t, struct ucred *);
48static void sg_pager_dealloc(vm_object_t);
49static int sg_pager_getpages(vm_object_t, vm_page_t *, int, int);
50static void sg_pager_putpages(vm_object_t, vm_page_t *, int,
51 boolean_t, int *);
52static boolean_t sg_pager_haspage(vm_object_t, vm_pindex_t, int *,
53 int *);
54
56static uma_zone_t fakepg_zone;
57
58static vm_page_t sg_pager_getfake(vm_paddr_t, vm_memattr_t);
59static void sg_pager_putfake(vm_page_t);
60
61struct pagerops sgpagerops = {
55struct pagerops sgpagerops = {
62 .pgo_init = sg_pager_init,
63 .pgo_alloc = sg_pager_alloc,
64 .pgo_dealloc = sg_pager_dealloc,
65 .pgo_getpages = sg_pager_getpages,
66 .pgo_putpages = sg_pager_putpages,
67 .pgo_haspage = sg_pager_haspage,
68};
69
56 .pgo_alloc = sg_pager_alloc,
57 .pgo_dealloc = sg_pager_dealloc,
58 .pgo_getpages = sg_pager_getpages,
59 .pgo_putpages = sg_pager_putpages,
60 .pgo_haspage = sg_pager_haspage,
61};
62
70static void
71sg_pager_init(void)
72{
73
74 fakepg_zone = uma_zcreate("SG fakepg", sizeof(struct vm_page),
75 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,
76 UMA_ZONE_NOFREE|UMA_ZONE_VM);
77}
78
79static vm_object_t
80sg_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
81 vm_ooffset_t foff, struct ucred *cred)
82{
83 struct sglist *sg;
84 vm_object_t object;
85 vm_pindex_t npages, pindex;
86 int i;

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133 struct sglist *sg;
134 vm_page_t m;
135
136 /*
137 * Free up our fake pages.
138 */
139 while ((m = TAILQ_FIRST(&object->un_pager.sgp.sgp_pglist)) != 0) {
140 TAILQ_REMOVE(&object->un_pager.sgp.sgp_pglist, m, pageq);
63static vm_object_t
64sg_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
65 vm_ooffset_t foff, struct ucred *cred)
66{
67 struct sglist *sg;
68 vm_object_t object;
69 vm_pindex_t npages, pindex;
70 int i;

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117 struct sglist *sg;
118 vm_page_t m;
119
120 /*
121 * Free up our fake pages.
122 */
123 while ((m = TAILQ_FIRST(&object->un_pager.sgp.sgp_pglist)) != 0) {
124 TAILQ_REMOVE(&object->un_pager.sgp.sgp_pglist, m, pageq);
141 sg_pager_putfake(m);
125 vm_page_putfake(m);
142 }
143
144 sg = object->handle;
145 sglist_free(sg);
146}
147
148static int
149sg_pager_getpages(vm_object_t object, vm_page_t *m, int count, int reqpage)

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188 "WARNING: A device driver has set \"memattr\" inconsistently.\n");
189 }
190
191 /* Return a fake page for the requested page. */
192 KASSERT(!(m[reqpage]->flags & PG_FICTITIOUS),
193 ("backing page for SG is fake"));
194
195 /* Construct a new fake page. */
126 }
127
128 sg = object->handle;
129 sglist_free(sg);
130}
131
132static int
133sg_pager_getpages(vm_object_t object, vm_page_t *m, int count, int reqpage)

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172 "WARNING: A device driver has set \"memattr\" inconsistently.\n");
173 }
174
175 /* Return a fake page for the requested page. */
176 KASSERT(!(m[reqpage]->flags & PG_FICTITIOUS),
177 ("backing page for SG is fake"));
178
179 /* Construct a new fake page. */
196 page = sg_pager_getfake(paddr, memattr);
180 page = vm_page_getfake(paddr, memattr);
197 VM_OBJECT_LOCK(object);
198 TAILQ_INSERT_TAIL(&object->un_pager.sgp.sgp_pglist, page, pageq);
199
200 /* Free the original pages and insert this fake page into the object. */
201 for (i = 0; i < count; i++) {
202 vm_page_lock(m[i]);
203 vm_page_free(m[i]);
204 vm_page_unlock(m[i]);

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224{
225
226 if (before != NULL)
227 *before = 0;
228 if (after != NULL)
229 *after = 0;
230 return (TRUE);
231}
181 VM_OBJECT_LOCK(object);
182 TAILQ_INSERT_TAIL(&object->un_pager.sgp.sgp_pglist, page, pageq);
183
184 /* Free the original pages and insert this fake page into the object. */
185 for (i = 0; i < count; i++) {
186 vm_page_lock(m[i]);
187 vm_page_free(m[i]);
188 vm_page_unlock(m[i]);

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208{
209
210 if (before != NULL)
211 *before = 0;
212 if (after != NULL)
213 *after = 0;
214 return (TRUE);
215}
232
233/*
234 * Create a fictitious page with the specified physical address and memory
235 * attribute. The memory attribute is the only the machine-dependent aspect
236 * of a fictitious page that must be initialized.
237 */
238static vm_page_t
239sg_pager_getfake(vm_paddr_t paddr, vm_memattr_t memattr)
240{
241 vm_page_t m;
242
243 m = uma_zalloc(fakepg_zone, M_WAITOK | M_ZERO);
244 m->phys_addr = paddr;
245 m->queue = PQ_NONE;
246 /* Fictitious pages don't use "segind". */
247 m->flags = PG_FICTITIOUS;
248 /* Fictitious pages don't use "order" or "pool". */
249 m->oflags = VPO_BUSY;
250 m->wire_count = 1;
251 pmap_page_set_memattr(m, memattr);
252 return (m);
253}
254
255static void
256sg_pager_putfake(vm_page_t m)
257{
258
259 if (!(m->flags & PG_FICTITIOUS))
260 panic("sg_pager_putfake: bad page");
261 uma_zfree(fakepg_zone, m);
262}