2 * Copyright (c) 1990 University of Utah.
3 * Copyright (c) 1991, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
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 * 4. 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 * @(#)device_pager.c 8.1 (Berkeley) 6/11/93
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
45 #include <sys/mutex.h>
50 #include <vm/vm_param.h>
51 #include <vm/vm_object.h>
52 #include <vm/vm_page.h>
53 #include <vm/vm_pager.h>
54 #include <vm/vm_phys.h>
57 #include <machine/cpu.h>
59 static void dev_pager_init(void);
60 static vm_object_t dev_pager_alloc(void *, vm_ooffset_t, vm_prot_t,
61 vm_ooffset_t, struct ucred *);
62 static void dev_pager_dealloc(vm_object_t);
63 static int dev_pager_getpages(vm_object_t, vm_page_t *, int, int);
64 static void dev_pager_putpages(vm_object_t, vm_page_t *, int,
66 static boolean_t dev_pager_haspage(vm_object_t, vm_pindex_t, int *,
68 static void dev_pager_free_page(vm_object_t object, vm_page_t m);
70 /* list of device pager objects */
71 static struct pagerlst dev_pager_object_list;
72 /* protect list manipulation */
73 static struct mtx dev_pager_mtx;
75 struct pagerops devicepagerops = {
76 .pgo_init = dev_pager_init,
77 .pgo_alloc = dev_pager_alloc,
78 .pgo_dealloc = dev_pager_dealloc,
79 .pgo_getpages = dev_pager_getpages,
80 .pgo_putpages = dev_pager_putpages,
81 .pgo_haspage = dev_pager_haspage,
84 struct pagerops mgtdevicepagerops = {
85 .pgo_alloc = dev_pager_alloc,
86 .pgo_dealloc = dev_pager_dealloc,
87 .pgo_getpages = dev_pager_getpages,
88 .pgo_putpages = dev_pager_putpages,
89 .pgo_haspage = dev_pager_haspage,
92 static int old_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
93 vm_ooffset_t foff, struct ucred *cred, u_short *color);
94 static void old_dev_pager_dtor(void *handle);
95 static int old_dev_pager_fault(vm_object_t object, vm_ooffset_t offset,
96 int prot, vm_page_t *mres);
98 static struct cdev_pager_ops old_dev_pager_ops = {
99 .cdev_pg_ctor = old_dev_pager_ctor,
100 .cdev_pg_dtor = old_dev_pager_dtor,
101 .cdev_pg_fault = old_dev_pager_fault
107 TAILQ_INIT(&dev_pager_object_list);
108 mtx_init(&dev_pager_mtx, "dev_pager list", NULL, MTX_DEF);
112 cdev_pager_lookup(void *handle)
116 mtx_lock(&dev_pager_mtx);
117 object = vm_pager_object_lookup(&dev_pager_object_list, handle);
118 mtx_unlock(&dev_pager_mtx);
123 cdev_pager_allocate(void *handle, enum obj_type tp, struct cdev_pager_ops *ops,
124 vm_ooffset_t size, vm_prot_t prot, vm_ooffset_t foff, struct ucred *cred)
126 vm_object_t object, object1;
130 if (tp != OBJT_DEVICE && tp != OBJT_MGTDEVICE)
134 * Offset should be page aligned.
136 if (foff & PAGE_MASK)
139 size = round_page(size);
140 pindex = OFF_TO_IDX(foff + size);
142 if (ops->cdev_pg_ctor(handle, size, prot, foff, cred, &color) != 0)
144 mtx_lock(&dev_pager_mtx);
147 * Look up pager, creating as necessary.
150 object = vm_pager_object_lookup(&dev_pager_object_list, handle);
151 if (object == NULL) {
153 * Allocate object and associate it with the pager. Initialize
154 * the object's pg_color based upon the physical address of the
157 mtx_unlock(&dev_pager_mtx);
158 object1 = vm_object_allocate(tp, pindex);
159 object1->flags |= OBJ_COLORED;
160 object1->pg_color = color;
161 object1->handle = handle;
162 object1->un_pager.devp.ops = ops;
163 object1->un_pager.devp.dev = handle;
164 TAILQ_INIT(&object1->un_pager.devp.devp_pglist);
165 mtx_lock(&dev_pager_mtx);
166 object = vm_pager_object_lookup(&dev_pager_object_list, handle);
167 if (object != NULL) {
169 * We raced with other thread while allocating object.
171 if (pindex > object->size)
172 object->size = pindex;
176 object->handle = handle;
177 TAILQ_INSERT_TAIL(&dev_pager_object_list, object,
179 KASSERT(object->type == tp,
180 ("Inconsistent device pager type %p %d", object, tp));
183 if (pindex > object->size)
184 object->size = pindex;
186 mtx_unlock(&dev_pager_mtx);
187 if (object1 != NULL) {
188 object1->handle = object1;
189 mtx_lock(&dev_pager_mtx);
190 TAILQ_INSERT_TAIL(&dev_pager_object_list, object1,
192 mtx_unlock(&dev_pager_mtx);
193 vm_object_deallocate(object1);
199 dev_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
200 vm_ooffset_t foff, struct ucred *cred)
203 return (cdev_pager_allocate(handle, OBJT_DEVICE, &old_dev_pager_ops,
204 size, prot, foff, cred));
208 cdev_pager_free_page(vm_object_t object, vm_page_t m)
211 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
212 if (object->type == OBJT_MGTDEVICE) {
213 KASSERT((m->oflags & VPO_UNMANAGED) == 0, ("unmanaged %p", m));
218 } else if (object->type == OBJT_DEVICE)
219 dev_pager_free_page(object, m);
223 dev_pager_free_page(vm_object_t object, vm_page_t m)
226 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
227 KASSERT((object->type == OBJT_DEVICE &&
228 (m->oflags & VPO_UNMANAGED) != 0),
229 ("Managed device or page obj %p m %p", object, m));
230 TAILQ_REMOVE(&object->un_pager.devp.devp_pglist, m, pageq);
235 dev_pager_dealloc(object)
240 VM_OBJECT_UNLOCK(object);
241 object->un_pager.devp.ops->cdev_pg_dtor(object->un_pager.devp.dev);
243 mtx_lock(&dev_pager_mtx);
244 TAILQ_REMOVE(&dev_pager_object_list, object, pager_object_list);
245 mtx_unlock(&dev_pager_mtx);
246 VM_OBJECT_LOCK(object);
248 if (object->type == OBJT_DEVICE) {
250 * Free up our fake pages.
252 while ((m = TAILQ_FIRST(&object->un_pager.devp.devp_pglist))
254 dev_pager_free_page(object, m);
259 dev_pager_getpages(vm_object_t object, vm_page_t *ma, int count, int reqpage)
263 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
264 error = object->un_pager.devp.ops->cdev_pg_fault(object,
265 IDX_TO_OFF(ma[reqpage]->pindex), PROT_READ, &ma[reqpage]);
267 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
269 for (i = 0; i < count; i++) {
273 vm_page_unlock(ma[i]);
277 if (error == VM_PAGER_OK) {
278 KASSERT((object->type == OBJT_DEVICE &&
279 (ma[reqpage]->oflags & VPO_UNMANAGED) != 0) ||
280 (object->type == OBJT_MGTDEVICE &&
281 (ma[reqpage]->oflags & VPO_UNMANAGED) == 0),
282 ("Wrong page type %p %p", ma[reqpage], object));
283 if (object->type == OBJT_DEVICE) {
284 TAILQ_INSERT_TAIL(&object->un_pager.devp.devp_pglist,
293 old_dev_pager_fault(vm_object_t object, vm_ooffset_t offset, int prot,
298 vm_page_t m_paddr, page;
303 vm_memattr_t memattr;
306 pidx = OFF_TO_IDX(offset);
307 memattr = object->memattr;
309 VM_OBJECT_UNLOCK(object);
311 dev = object->handle;
312 csw = dev_refthread(dev, &ref);
314 VM_OBJECT_LOCK(object);
315 return (VM_PAGER_FAIL);
320 ret = csw->d_mmap(dev, offset, &paddr, prot, &memattr);
322 dev_relthread(dev, ref);
325 "WARNING: dev_pager_getpage: map function returns error %d", ret);
326 VM_OBJECT_LOCK(object);
327 return (VM_PAGER_FAIL);
330 /* If "paddr" is a real page, perform a sanity check on "memattr". */
331 if ((m_paddr = vm_phys_paddr_to_vm_page(paddr)) != NULL &&
332 pmap_page_get_memattr(m_paddr) != memattr) {
333 memattr = pmap_page_get_memattr(m_paddr);
335 "WARNING: A device driver has set \"memattr\" inconsistently.\n");
337 if (((*mres)->flags & PG_FICTITIOUS) != 0) {
339 * If the passed in result page is a fake page, update it with
340 * the new physical address.
343 VM_OBJECT_LOCK(object);
344 vm_page_updatefake(page, paddr, memattr);
347 * Replace the passed in reqpage page with our own fake page and
348 * free up the all of the original pages.
350 page = vm_page_getfake(paddr, memattr);
351 VM_OBJECT_LOCK(object);
354 vm_page_unlock(*mres);
356 while (vm_page_insert(page, object, pidx) != 0) {
357 for (i = 0; i < 10000000; i++)
361 page->valid = VM_PAGE_BITS_ALL;
362 return (VM_PAGER_OK);
366 dev_pager_putpages(object, m, count, sync, rtvals)
374 panic("dev_pager_putpage called");
378 dev_pager_haspage(object, pindex, before, after)
392 old_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
393 vm_ooffset_t foff, struct ucred *cred, u_short *color)
404 * Make sure this device can be mapped.
407 csw = dev_refthread(dev, &ref);
412 * Check that the specified range of the device allows the desired
415 * XXX assumes VM_PROT_* == PROT_*
417 npages = OFF_TO_IDX(size);
418 for (off = foff; npages--; off += PAGE_SIZE) {
419 if (csw->d_mmap(dev, off, &paddr, (int)prot, &dummy) != 0) {
420 dev_relthread(dev, ref);
426 dev_relthread(dev, ref);
427 *color = atop(paddr) - OFF_TO_IDX(off - PAGE_SIZE);
432 old_dev_pager_dtor(void *handle)