Deleted Added
sdiff udiff text old ( 1542 ) new ( 1549 )
full compact
device_pager.c (1542) device_pager.c (1549)
1/*
2 * Copyright (c) 1990 University of Utah.
3 * Copyright (c) 1991, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department.

--- 21 unchanged lines hidden (view full) ---

30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
1/*
2 * Copyright (c) 1990 University of Utah.
3 * Copyright (c) 1991, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department.

--- 21 unchanged lines hidden (view full) ---

30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)device_pager.c 8.5 (Berkeley) 1/12/94
38 * @(#)device_pager.c 8.1 (Berkeley) 6/11/93
39 */
40
41/*
42 * Page to/from special files.
43 */
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/conf.h>
48#include <sys/mman.h>
49#include <sys/malloc.h>
50
51#include <vm/vm.h>
52#include <vm/vm_kern.h>
53#include <vm/vm_page.h>
54#include <vm/device_pager.h>
55
39 */
40
41/*
42 * Page to/from special files.
43 */
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/conf.h>
48#include <sys/mman.h>
49#include <sys/malloc.h>
50
51#include <vm/vm.h>
52#include <vm/vm_kern.h>
53#include <vm/vm_page.h>
54#include <vm/device_pager.h>
55
56struct pagerlst dev_pager_list; /* list of managed devices */
57struct pglist dev_pager_fakelist; /* list of available vm_page_t's */
56struct pagerlst dev_pager_list; /* list of managed devices */
57struct pglist dev_pager_fakelist; /* list of available vm_page_t's */
58
59#ifdef DEBUG
60int dpagerdebug = 0;
61#define DDB_FOLLOW 0x01
62#define DDB_INIT 0x02
63#define DDB_ALLOC 0x04
64#define DDB_FAIL 0x08
65#endif
66
67static vm_pager_t dev_pager_alloc
68 __P((caddr_t, vm_size_t, vm_prot_t, vm_offset_t));
69static void dev_pager_dealloc __P((vm_pager_t));
70static int dev_pager_getpage
58
59#ifdef DEBUG
60int dpagerdebug = 0;
61#define DDB_FOLLOW 0x01
62#define DDB_INIT 0x02
63#define DDB_ALLOC 0x04
64#define DDB_FAIL 0x08
65#endif
66
67static vm_pager_t dev_pager_alloc
68 __P((caddr_t, vm_size_t, vm_prot_t, vm_offset_t));
69static void dev_pager_dealloc __P((vm_pager_t));
70static int dev_pager_getpage
71 __P((vm_pager_t, vm_page_t *, int, boolean_t));
71 __P((vm_pager_t, vm_page_t, boolean_t));
72static boolean_t dev_pager_haspage __P((vm_pager_t, vm_offset_t));
73static void dev_pager_init __P((void));
74static int dev_pager_putpage
72static boolean_t dev_pager_haspage __P((vm_pager_t, vm_offset_t));
73static void dev_pager_init __P((void));
74static int dev_pager_putpage
75 __P((vm_pager_t, vm_page_t *, int, boolean_t));
75 __P((vm_pager_t, vm_page_t, boolean_t));
76static vm_page_t dev_pager_getfake __P((vm_offset_t));
77static void dev_pager_putfake __P((vm_page_t));
78
79struct pagerops devicepagerops = {
80 dev_pager_init,
81 dev_pager_alloc,
82 dev_pager_dealloc,
83 dev_pager_getpage,
76static vm_page_t dev_pager_getfake __P((vm_offset_t));
77static void dev_pager_putfake __P((vm_page_t));
78
79struct pagerops devicepagerops = {
80 dev_pager_init,
81 dev_pager_alloc,
82 dev_pager_dealloc,
83 dev_pager_getpage,
84 0,
84 dev_pager_putpage,
85 dev_pager_putpage,
85 dev_pager_haspage,
86 vm_pager_clusternull
86 0,
87 dev_pager_haspage
87};
88
89static void
90dev_pager_init()
91{
92#ifdef DEBUG
93 if (dpagerdebug & DDB_FOLLOW)
94 printf("dev_pager_init()\n");

--- 9 unchanged lines hidden (view full) ---

104 vm_prot_t prot;
105 vm_offset_t foff;
106{
107 dev_t dev;
108 vm_pager_t pager;
109 int (*mapfunc)();
110 vm_object_t object;
111 dev_pager_t devp;
88};
89
90static void
91dev_pager_init()
92{
93#ifdef DEBUG
94 if (dpagerdebug & DDB_FOLLOW)
95 printf("dev_pager_init()\n");

--- 9 unchanged lines hidden (view full) ---

105 vm_prot_t prot;
106 vm_offset_t foff;
107{
108 dev_t dev;
109 vm_pager_t pager;
110 int (*mapfunc)();
111 vm_object_t object;
112 dev_pager_t devp;
112 int npages, off;
113 unsigned int npages, off;
113
114#ifdef DEBUG
115 if (dpagerdebug & DDB_FOLLOW)
116 printf("dev_pager_alloc(%x, %x, %x, %x)\n",
117 handle, size, prot, foff);
118#endif
119#ifdef DIAGNOSTIC
120 /*
121 * Pageout to device, should never happen.
122 */
123 if (handle == NULL)
124 panic("dev_pager_alloc called");
125#endif
126
127 /*
128 * Make sure this device can be mapped.
129 */
114
115#ifdef DEBUG
116 if (dpagerdebug & DDB_FOLLOW)
117 printf("dev_pager_alloc(%x, %x, %x, %x)\n",
118 handle, size, prot, foff);
119#endif
120#ifdef DIAGNOSTIC
121 /*
122 * Pageout to device, should never happen.
123 */
124 if (handle == NULL)
125 panic("dev_pager_alloc called");
126#endif
127
128 /*
129 * Make sure this device can be mapped.
130 */
130 dev = (dev_t)handle;
131 dev = (dev_t)(u_long)handle;
131 mapfunc = cdevsw[major(dev)].d_mmap;
132 if (mapfunc == NULL || mapfunc == enodev || mapfunc == nullop)
133 return(NULL);
134
135 /*
136 * Offset should be page aligned.
137 */
132 mapfunc = cdevsw[major(dev)].d_mmap;
133 if (mapfunc == NULL || mapfunc == enodev || mapfunc == nullop)
134 return(NULL);
135
136 /*
137 * Offset should be page aligned.
138 */
138 if (foff & PAGE_MASK)
139 if (foff & (PAGE_SIZE-1))
139 return(NULL);
140
141 /*
142 * Check that the specified range of the device allows the
143 * desired protection.
144 *
145 * XXX assumes VM_PROT_* == PROT_*
146 */

--- 17 unchanged lines hidden (view full) ---

164 devp = (dev_pager_t)malloc(sizeof *devp, M_VMPGDATA, M_WAITOK);
165 if (devp == NULL) {
166 free((caddr_t)pager, M_VMPAGER);
167 return(NULL);
168 }
169 pager->pg_handle = handle;
170 pager->pg_ops = &devicepagerops;
171 pager->pg_type = PG_DEVICE;
140 return(NULL);
141
142 /*
143 * Check that the specified range of the device allows the
144 * desired protection.
145 *
146 * XXX assumes VM_PROT_* == PROT_*
147 */

--- 17 unchanged lines hidden (view full) ---

165 devp = (dev_pager_t)malloc(sizeof *devp, M_VMPGDATA, M_WAITOK);
166 if (devp == NULL) {
167 free((caddr_t)pager, M_VMPAGER);
168 return(NULL);
169 }
170 pager->pg_handle = handle;
171 pager->pg_ops = &devicepagerops;
172 pager->pg_type = PG_DEVICE;
173 pager->pg_data = (caddr_t)devp;
172 pager->pg_flags = 0;
174 pager->pg_flags = 0;
173 pager->pg_data = devp;
174 TAILQ_INIT(&devp->devp_pglist);
175 /*
176 * Allocate object and associate it with the pager.
177 */
178 object = devp->devp_object = vm_object_allocate(0);
179 vm_object_enter(object, pager);
175 TAILQ_INIT(&devp->devp_pglist);
176 /*
177 * Allocate object and associate it with the pager.
178 */
179 object = devp->devp_object = vm_object_allocate(0);
180 vm_object_enter(object, pager);
180 vm_object_setpager(object, pager, (vm_offset_t)0, FALSE);
181 vm_object_setpager(object, pager, (vm_offset_t)foff, FALSE);
181 /*
182 * Finally, put it on the managed list so other can find it.
183 * First we re-lookup in case someone else beat us to this
184 * point (due to blocking in the various mallocs). If so,
185 * we free everything and start over.
186 */
187 if (vm_pager_lookup(&dev_pager_list, handle)) {
188 free((caddr_t)devp, M_VMPGDATA);

--- 45 unchanged lines hidden (view full) ---

234 object = devp->devp_object;
235#ifdef DEBUG
236 if (dpagerdebug & DDB_ALLOC)
237 printf("dev_pager_dealloc: devp %x object %x\n", devp, object);
238#endif
239 /*
240 * Free up our fake pages.
241 */
182 /*
183 * Finally, put it on the managed list so other can find it.
184 * First we re-lookup in case someone else beat us to this
185 * point (due to blocking in the various mallocs). If so,
186 * we free everything and start over.
187 */
188 if (vm_pager_lookup(&dev_pager_list, handle)) {
189 free((caddr_t)devp, M_VMPGDATA);

--- 45 unchanged lines hidden (view full) ---

235 object = devp->devp_object;
236#ifdef DEBUG
237 if (dpagerdebug & DDB_ALLOC)
238 printf("dev_pager_dealloc: devp %x object %x\n", devp, object);
239#endif
240 /*
241 * Free up our fake pages.
242 */
242 while ((m = devp->devp_pglist.tqh_first) != NULL) {
243 while (m=devp->devp_pglist.tqh_first) {
243 TAILQ_REMOVE(&devp->devp_pglist, m, pageq);
244 dev_pager_putfake(m);
245 }
246 free((caddr_t)devp, M_VMPGDATA);
247 free((caddr_t)pager, M_VMPAGER);
248}
249
250static int
244 TAILQ_REMOVE(&devp->devp_pglist, m, pageq);
245 dev_pager_putfake(m);
246 }
247 free((caddr_t)devp, M_VMPGDATA);
248 free((caddr_t)pager, M_VMPAGER);
249}
250
251static int
251dev_pager_getpage(pager, mlist, npages, sync)
252dev_pager_getpage(pager, m, sync)
252 vm_pager_t pager;
253 vm_pager_t pager;
253 vm_page_t *mlist;
254 int npages;
254 vm_page_t m;
255 boolean_t sync;
256{
257 register vm_object_t object;
258 vm_offset_t offset, paddr;
259 vm_page_t page;
260 dev_t dev;
255 boolean_t sync;
256{
257 register vm_object_t object;
258 vm_offset_t offset, paddr;
259 vm_page_t page;
260 dev_t dev;
261 int s;
261 int (*mapfunc)(), prot;
262 int (*mapfunc)(), prot;
262 vm_page_t m;
263
264#ifdef DEBUG
265 if (dpagerdebug & DDB_FOLLOW)
263
264#ifdef DEBUG
265 if (dpagerdebug & DDB_FOLLOW)
266 printf("dev_pager_getpage(%x, %x, %x, %x)\n",
267 pager, mlist, npages, sync);
266 printf("dev_pager_getpage(%x, %x)\n", pager, m);
268#endif
269
267#endif
268
270 if (npages != 1)
271 panic("dev_pager_getpage: cannot handle multiple pages");
272 m = *mlist;
273
274 object = m->object;
269 object = m->object;
275 dev = (dev_t)pager->pg_handle;
270 dev = (dev_t)(u_long)pager->pg_handle;
276 offset = m->offset + object->paging_offset;
277 prot = PROT_READ; /* XXX should pass in? */
278 mapfunc = cdevsw[major(dev)].d_mmap;
271 offset = m->offset + object->paging_offset;
272 prot = PROT_READ; /* XXX should pass in? */
273 mapfunc = cdevsw[major(dev)].d_mmap;
279#ifdef DIAGNOSTIC
274
280 if (mapfunc == NULL || mapfunc == enodev || mapfunc == nullop)
281 panic("dev_pager_getpage: no map function");
275 if (mapfunc == NULL || mapfunc == enodev || mapfunc == nullop)
276 panic("dev_pager_getpage: no map function");
282#endif
283 paddr = pmap_phys_address((*mapfunc)(dev, (int)offset, prot));
277
278 paddr = pmap_phys_address((*mapfunc)((dev_t)dev, (int)offset, prot));
284#ifdef DIAGNOSTIC
285 if (paddr == -1)
286 panic("dev_pager_getpage: map function returns error");
287#endif
288 /*
289 * Replace the passed in page with our own fake page and free
290 * up the original.
291 */
292 page = dev_pager_getfake(paddr);
279#ifdef DIAGNOSTIC
280 if (paddr == -1)
281 panic("dev_pager_getpage: map function returns error");
282#endif
283 /*
284 * Replace the passed in page with our own fake page and free
285 * up the original.
286 */
287 page = dev_pager_getfake(paddr);
293 TAILQ_INSERT_TAIL(&((dev_pager_t)pager->pg_data)->devp_pglist, page,
294 pageq);
288 TAILQ_INSERT_TAIL(&((dev_pager_t)pager->pg_data)->devp_pglist,
289 page, pageq);
295 vm_object_lock(object);
296 vm_page_lock_queues();
297 vm_page_free(m);
290 vm_object_lock(object);
291 vm_page_lock_queues();
292 vm_page_free(m);
298 vm_page_insert(page, object, offset);
299 vm_page_unlock_queues();
293 vm_page_unlock_queues();
294 s = splhigh();
295 vm_page_insert(page, object, offset);
296 splx(s);
300 PAGE_WAKEUP(m);
301 if (offset + PAGE_SIZE > object->size)
302 object->size = offset + PAGE_SIZE; /* XXX anal */
303 vm_object_unlock(object);
304
305 return(VM_PAGER_OK);
306}
307
308static int
297 PAGE_WAKEUP(m);
298 if (offset + PAGE_SIZE > object->size)
299 object->size = offset + PAGE_SIZE; /* XXX anal */
300 vm_object_unlock(object);
301
302 return(VM_PAGER_OK);
303}
304
305static int
309dev_pager_putpage(pager, mlist, npages, sync)
306dev_pager_putpage(pager, m, sync)
310 vm_pager_t pager;
307 vm_pager_t pager;
311 vm_page_t *mlist;
312 int npages;
308 vm_page_t m;
313 boolean_t sync;
314{
315#ifdef DEBUG
316 if (dpagerdebug & DDB_FOLLOW)
309 boolean_t sync;
310{
311#ifdef DEBUG
312 if (dpagerdebug & DDB_FOLLOW)
317 printf("dev_pager_putpage(%x, %x, %x, %x)\n",
318 pager, mlist, npages, sync);
313 printf("dev_pager_putpage(%x, %x)\n", pager, m);
319#endif
320 if (pager == NULL)
314#endif
315 if (pager == NULL)
321 return;
316 return 0;
322 panic("dev_pager_putpage called");
323}
324
325static boolean_t
326dev_pager_haspage(pager, offset)
327 vm_pager_t pager;
328 vm_offset_t offset;
329{

--- 15 unchanged lines hidden (view full) ---

345 m = (vm_page_t)malloc(PAGE_SIZE, M_VMPGDATA, M_WAITOK);
346 for (i = PAGE_SIZE / sizeof(*m); i > 0; i--) {
347 TAILQ_INSERT_TAIL(&dev_pager_fakelist, m, pageq);
348 m++;
349 }
350 }
351 m = dev_pager_fakelist.tqh_first;
352 TAILQ_REMOVE(&dev_pager_fakelist, m, pageq);
317 panic("dev_pager_putpage called");
318}
319
320static boolean_t
321dev_pager_haspage(pager, offset)
322 vm_pager_t pager;
323 vm_offset_t offset;
324{

--- 15 unchanged lines hidden (view full) ---

340 m = (vm_page_t)malloc(PAGE_SIZE, M_VMPGDATA, M_WAITOK);
341 for (i = PAGE_SIZE / sizeof(*m); i > 0; i--) {
342 TAILQ_INSERT_TAIL(&dev_pager_fakelist, m, pageq);
343 m++;
344 }
345 }
346 m = dev_pager_fakelist.tqh_first;
347 TAILQ_REMOVE(&dev_pager_fakelist, m, pageq);
348
353 m->flags = PG_BUSY | PG_CLEAN | PG_FAKE | PG_FICTITIOUS;
349 m->flags = PG_BUSY | PG_CLEAN | PG_FAKE | PG_FICTITIOUS;
354 m->phys_addr = paddr;
350
355 m->wire_count = 1;
351 m->wire_count = 1;
352 m->phys_addr = paddr;
353
356 return(m);
357}
358
359static void
360dev_pager_putfake(m)
361 vm_page_t m;
362{
363#ifdef DIAGNOSTIC
364 if (!(m->flags & PG_FICTITIOUS))
365 panic("dev_pager_putfake: bad page");
366#endif
367 TAILQ_INSERT_TAIL(&dev_pager_fakelist, m, pageq);
368}
354 return(m);
355}
356
357static void
358dev_pager_putfake(m)
359 vm_page_t m;
360{
361#ifdef DIAGNOSTIC
362 if (!(m->flags & PG_FICTITIOUS))
363 panic("dev_pager_putfake: bad page");
364#endif
365 TAILQ_INSERT_TAIL(&dev_pager_fakelist, m, pageq);
366}