1 /**
2 * \file drm_bufs.c
3 * Generic buffer template
4 *
5 * \author Rickard E. (Rik) Faith <[email protected]>
6 * \author Gareth Hughes <[email protected]>
7 */
8
9 /*
10 * Created: Thu Nov 23 03:10:50 2000 by [email protected]
11 *
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36 #include <sys/cdefs.h>
37 #include <sys/param.h>
38 #include <sys/shm.h>
39
40 #include <dev/pci/pcireg.h>
41
42 #include <dev/drm2/drmP.h>
43
44 /* Allocation of PCI memory resources (framebuffer, registers, etc.) for
45 * drm_get_resource_*. Note that they are not RF_ACTIVE, so there's no virtual
46 * address for accessing them. Cleaned up at unload.
47 */
drm_alloc_resource(struct drm_device * dev,int resource)48 static int drm_alloc_resource(struct drm_device *dev, int resource)
49 {
50 struct resource *res;
51 int rid;
52
53 if (resource >= DRM_MAX_PCI_RESOURCE) {
54 DRM_ERROR("Resource %d too large\n", resource);
55 return 1;
56 }
57
58 if (dev->pcir[resource] != NULL) {
59 return 0;
60 }
61
62 rid = PCIR_BAR(resource);
63 res = bus_alloc_resource_any(dev->dev, SYS_RES_MEMORY, &rid,
64 RF_SHAREABLE);
65 if (res == NULL) {
66 DRM_ERROR("Couldn't find resource 0x%x\n", resource);
67 return 1;
68 }
69
70 if (dev->pcir[resource] == NULL) {
71 dev->pcirid[resource] = rid;
72 dev->pcir[resource] = res;
73 }
74
75 return 0;
76 }
77
drm_get_resource_start(struct drm_device * dev,unsigned int resource)78 unsigned long drm_get_resource_start(struct drm_device *dev,
79 unsigned int resource)
80 {
81 unsigned long start;
82
83 mtx_lock(&dev->pcir_lock);
84
85 if (drm_alloc_resource(dev, resource) != 0)
86 return 0;
87
88 start = rman_get_start(dev->pcir[resource]);
89
90 mtx_unlock(&dev->pcir_lock);
91
92 return (start);
93 }
94
drm_get_resource_len(struct drm_device * dev,unsigned int resource)95 unsigned long drm_get_resource_len(struct drm_device *dev,
96 unsigned int resource)
97 {
98 unsigned long len;
99
100 mtx_lock(&dev->pcir_lock);
101
102 if (drm_alloc_resource(dev, resource) != 0)
103 return 0;
104
105 len = rman_get_size(dev->pcir[resource]);
106
107 mtx_unlock(&dev->pcir_lock);
108
109 return (len);
110 }
111
drm_find_matching_map(struct drm_device * dev,struct drm_local_map * map)112 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
113 struct drm_local_map *map)
114 {
115 struct drm_map_list *entry;
116 list_for_each_entry(entry, &dev->maplist, head) {
117 /*
118 * Because the kernel-userspace ABI is fixed at a 32-bit offset
119 * while PCI resources may live above that, we only compare the
120 * lower 32 bits of the map offset for maps of type
121 * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
122 * It is assumed that if a driver have more than one resource
123 * of each type, the lower 32 bits are different.
124 */
125 if (!entry->map ||
126 map->type != entry->map->type ||
127 entry->master != dev->primary->master)
128 continue;
129 switch (map->type) {
130 case _DRM_SHM:
131 if (map->flags != _DRM_CONTAINS_LOCK)
132 break;
133 return entry;
134 case _DRM_REGISTERS:
135 case _DRM_FRAME_BUFFER:
136 if ((entry->map->offset & 0xffffffff) ==
137 (map->offset & 0xffffffff))
138 return entry;
139 default: /* Make gcc happy */
140 ;
141 }
142 if (entry->map->offset == map->offset)
143 return entry;
144 }
145
146 return NULL;
147 }
148
drm_map_handle(struct drm_device * dev,struct drm_hash_item * hash,unsigned long user_token,int hashed_handle,int shm)149 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
150 unsigned long user_token, int hashed_handle, int shm)
151 {
152 int use_hashed_handle, shift;
153 unsigned long add;
154
155 #if (BITS_PER_LONG == 64)
156 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
157 #elif (BITS_PER_LONG == 32)
158 use_hashed_handle = hashed_handle;
159 #else
160 #error Unsupported long size. Neither 64 nor 32 bits.
161 #endif
162
163 if (!use_hashed_handle) {
164 int ret;
165 hash->key = user_token >> PAGE_SHIFT;
166 ret = drm_ht_insert_item(&dev->map_hash, hash);
167 if (ret != -EINVAL)
168 return ret;
169 }
170
171 shift = 0;
172 add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
173 if (shm && (SHMLBA > PAGE_SIZE)) {
174 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
175
176 /* For shared memory, we have to preserve the SHMLBA
177 * bits of the eventual vma->vm_pgoff value during
178 * mmap(). Otherwise we run into cache aliasing problems
179 * on some platforms. On these platforms, the pgoff of
180 * a mmap() request is used to pick a suitable virtual
181 * address for the mmap() region such that it will not
182 * cause cache aliasing problems.
183 *
184 * Therefore, make sure the SHMLBA relevant bits of the
185 * hash value we use are equal to those in the original
186 * kernel virtual address.
187 */
188 shift = bits;
189 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
190 }
191
192 return drm_ht_just_insert_please(&dev->map_hash, hash,
193 user_token, 32 - PAGE_SHIFT - 3,
194 shift, add);
195 }
196
197 /**
198 * Core function to create a range of memory available for mapping by a
199 * non-root process.
200 *
201 * Adjusts the memory offset to its absolute value according to the mapping
202 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
203 * applicable and if supported by the kernel.
204 */
drm_addmap_core(struct drm_device * dev,resource_size_t offset,unsigned int size,enum drm_map_type type,enum drm_map_flags flags,struct drm_map_list ** maplist)205 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
206 unsigned int size, enum drm_map_type type,
207 enum drm_map_flags flags,
208 struct drm_map_list ** maplist)
209 {
210 struct drm_local_map *map;
211 struct drm_map_list *list;
212 drm_dma_handle_t *dmah;
213 unsigned long user_token;
214 int ret;
215 int align;
216
217 map = malloc(sizeof(*map), DRM_MEM_MAPS, M_NOWAIT);
218 if (!map)
219 return -ENOMEM;
220
221 map->offset = offset;
222 map->size = size;
223 map->flags = flags;
224 map->type = type;
225
226 /* Only allow shared memory to be removable since we only keep enough
227 * book keeping information about shared memory to allow for removal
228 * when processes fork.
229 */
230 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
231 free(map, DRM_MEM_MAPS);
232 return -EINVAL;
233 }
234 DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
235 (unsigned long long)map->offset, map->size, map->type);
236
237 /* page-align _DRM_SHM maps. They are allocated here so there is no security
238 * hole created by that and it works around various broken drivers that use
239 * a non-aligned quantity to map the SAREA. --BenH
240 */
241 if (map->type == _DRM_SHM)
242 map->size = PAGE_ALIGN(map->size);
243
244 /*
245 * FreeBSD port note: FreeBSD's PAGE_MASK is the inverse of
246 * Linux's one. That's why the test below doesn't inverse the
247 * constant.
248 */
249 if ((map->offset & ((resource_size_t)PAGE_MASK)) || (map->size & (PAGE_MASK))) {
250 free(map, DRM_MEM_MAPS);
251 return -EINVAL;
252 }
253 map->mtrr = -1;
254 map->handle = NULL;
255
256 switch (map->type) {
257 case _DRM_REGISTERS:
258 case _DRM_FRAME_BUFFER:
259 #ifdef __linux__
260 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
261 if (map->offset + (map->size-1) < map->offset ||
262 map->offset < virt_to_phys(high_memory)) {
263 kfree(map);
264 return -EINVAL;
265 }
266 #endif
267 #endif
268 /* Some drivers preinitialize some maps, without the X Server
269 * needing to be aware of it. Therefore, we just return success
270 * when the server tries to create a duplicate map.
271 */
272 list = drm_find_matching_map(dev, map);
273 if (list != NULL) {
274 if (list->map->size != map->size) {
275 DRM_DEBUG("Matching maps of type %d with "
276 "mismatched sizes, (%ld vs %ld)\n",
277 map->type, map->size,
278 list->map->size);
279 list->map->size = map->size;
280 }
281
282 free(map, DRM_MEM_MAPS);
283 *maplist = list;
284 return 0;
285 }
286
287 if (drm_core_has_MTRR(dev)) {
288 if (map->type == _DRM_FRAME_BUFFER ||
289 (map->flags & _DRM_WRITE_COMBINING)) {
290 if (drm_mtrr_add(
291 map->offset, map->size,
292 DRM_MTRR_WC) == 0)
293 map->mtrr = 1;
294 }
295 }
296 if (map->type == _DRM_REGISTERS) {
297 drm_core_ioremap(map, dev);
298 if (!map->handle) {
299 free(map, DRM_MEM_MAPS);
300 return -ENOMEM;
301 }
302 }
303
304 break;
305 case _DRM_SHM:
306 list = drm_find_matching_map(dev, map);
307 if (list != NULL) {
308 if(list->map->size != map->size) {
309 DRM_DEBUG("Matching maps of type %d with "
310 "mismatched sizes, (%ld vs %ld)\n",
311 map->type, map->size, list->map->size);
312 list->map->size = map->size;
313 }
314
315 free(map, DRM_MEM_MAPS);
316 *maplist = list;
317 return 0;
318 }
319 map->handle = malloc(map->size, DRM_MEM_MAPS, M_NOWAIT);
320 DRM_DEBUG("%lu %d %p\n",
321 map->size, drm_order(map->size), map->handle);
322 if (!map->handle) {
323 free(map, DRM_MEM_MAPS);
324 return -ENOMEM;
325 }
326 map->offset = (unsigned long)map->handle;
327 if (map->flags & _DRM_CONTAINS_LOCK) {
328 /* Prevent a 2nd X Server from creating a 2nd lock */
329 if (dev->primary->master->lock.hw_lock != NULL) {
330 free(map->handle, DRM_MEM_MAPS);
331 free(map, DRM_MEM_MAPS);
332 return -EBUSY;
333 }
334 dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */
335 }
336 break;
337 case _DRM_AGP: {
338 struct drm_agp_mem *entry;
339 int valid = 0;
340
341 if (!drm_core_has_AGP(dev)) {
342 free(map, DRM_MEM_MAPS);
343 return -EINVAL;
344 }
345 #ifdef __linux__
346 #ifdef __alpha__
347 map->offset += dev->hose->mem_space->start;
348 #endif
349 #endif
350 /* In some cases (i810 driver), user space may have already
351 * added the AGP base itself, because dev->agp->base previously
352 * only got set during AGP enable. So, only add the base
353 * address if the map's offset isn't already within the
354 * aperture.
355 */
356 if (map->offset < dev->agp->base ||
357 map->offset > dev->agp->base +
358 dev->agp->agp_info.ai_aperture_size * 1024 * 1024 - 1) {
359 map->offset += dev->agp->base;
360 }
361 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
362
363 /* This assumes the DRM is in total control of AGP space.
364 * It's not always the case as AGP can be in the control
365 * of user space (i.e. i810 driver). So this loop will get
366 * skipped and we double check that dev->agp->memory is
367 * actually set as well as being invalid before EPERM'ing
368 */
369 list_for_each_entry(entry, &dev->agp->memory, head) {
370 if ((map->offset >= entry->bound) &&
371 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
372 valid = 1;
373 break;
374 }
375 }
376 if (!list_empty(&dev->agp->memory) && !valid) {
377 free(map, DRM_MEM_MAPS);
378 return -EPERM;
379 }
380 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
381 (unsigned long long)map->offset, map->size);
382
383 break;
384 }
385 case _DRM_GEM:
386 DRM_ERROR("tried to addmap GEM object\n");
387 break;
388 case _DRM_SCATTER_GATHER:
389 if (!dev->sg) {
390 free(map, DRM_MEM_MAPS);
391 return -EINVAL;
392 }
393 map->handle = (char *)dev->sg->vaddr + offset;
394 map->offset += (uintptr_t)dev->sg->vaddr;
395 break;
396 case _DRM_CONSISTENT:
397 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
398 * As we're limiting the address to 2^32-1 (or less),
399 * casting it down to 32 bits is no problem, but we
400 * need to point to a 64bit variable first. */
401 align = map->size;
402 if ((align & (align - 1)) != 0)
403 align = PAGE_SIZE;
404 dmah = drm_pci_alloc(dev, map->size, align, BUS_SPACE_MAXADDR);
405 if (!dmah) {
406 free(map, DRM_MEM_MAPS);
407 return -ENOMEM;
408 }
409 map->handle = dmah->vaddr;
410 map->offset = dmah->busaddr;
411 map->dmah = dmah;
412 break;
413 default:
414 free(map, DRM_MEM_MAPS);
415 return -EINVAL;
416 }
417
418 list = malloc(sizeof(*list), DRM_MEM_MAPS, M_ZERO | M_NOWAIT);
419 if (!list) {
420 if (map->type == _DRM_REGISTERS)
421 drm_core_ioremapfree(map, dev);
422 free(map, DRM_MEM_MAPS);
423 return -EINVAL;
424 }
425 list->map = map;
426
427 DRM_LOCK(dev);
428 list_add(&list->head, &dev->maplist);
429
430 /* Assign a 32-bit handle */
431 /* We do it here so that dev->struct_mutex protects the increment */
432 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
433 map->offset;
434 ret = drm_map_handle(dev, &list->hash, user_token, 0,
435 (map->type == _DRM_SHM));
436 if (ret) {
437 if (map->type == _DRM_REGISTERS)
438 drm_core_ioremapfree(map, dev);
439 free(map, DRM_MEM_MAPS);
440 free(list, DRM_MEM_MAPS);
441 DRM_UNLOCK(dev);
442 return ret;
443 }
444
445 list->user_token = list->hash.key << PAGE_SHIFT;
446 DRM_UNLOCK(dev);
447
448 if (!(map->flags & _DRM_DRIVER))
449 list->master = dev->primary->master;
450 *maplist = list;
451 return 0;
452 }
453
drm_addmap(struct drm_device * dev,resource_size_t offset,unsigned int size,enum drm_map_type type,enum drm_map_flags flags,struct drm_local_map ** map_ptr)454 int drm_addmap(struct drm_device * dev, resource_size_t offset,
455 unsigned int size, enum drm_map_type type,
456 enum drm_map_flags flags, struct drm_local_map ** map_ptr)
457 {
458 struct drm_map_list *list;
459 int rc;
460
461 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
462 if (!rc)
463 *map_ptr = list->map;
464 return rc;
465 }
466
467 EXPORT_SYMBOL(drm_addmap);
468
469 /**
470 * Ioctl to specify a range of memory that is available for mapping by a
471 * non-root process.
472 *
473 * \param inode device inode.
474 * \param file_priv DRM file private.
475 * \param cmd command.
476 * \param arg pointer to a drm_map structure.
477 * \return zero on success or a negative value on error.
478 *
479 */
drm_addmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)480 int drm_addmap_ioctl(struct drm_device *dev, void *data,
481 struct drm_file *file_priv)
482 {
483 struct drm_map *map = data;
484 struct drm_map_list *maplist;
485 int err;
486
487 if (!(DRM_SUSER(DRM_CURPROC) || map->type == _DRM_AGP || map->type == _DRM_SHM))
488 return -EPERM;
489
490 err = drm_addmap_core(dev, map->offset, map->size, map->type,
491 map->flags, &maplist);
492
493 if (err)
494 return err;
495
496 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
497 map->handle = (void *)(unsigned long)maplist->user_token;
498 return 0;
499 }
500
501 /**
502 * Remove a map private from list and deallocate resources if the mapping
503 * isn't in use.
504 *
505 * Searches the map on drm_device::maplist, removes it from the list, see if
506 * its being used, and free any associate resource (such as MTRR's) if it's not
507 * being on use.
508 *
509 * \sa drm_addmap
510 */
drm_rmmap_locked(struct drm_device * dev,struct drm_local_map * map)511 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
512 {
513 struct drm_map_list *r_list = NULL, *list_t;
514 int found = 0;
515 struct drm_master *master;
516
517 /* Find the list entry for the map and remove it */
518 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
519 if (r_list->map == map) {
520 master = r_list->master;
521 list_del(&r_list->head);
522 drm_ht_remove_key(&dev->map_hash,
523 r_list->user_token >> PAGE_SHIFT);
524 free(r_list, DRM_MEM_MAPS);
525 found = 1;
526 break;
527 }
528 }
529
530 if (!found)
531 return -EINVAL;
532
533 switch (map->type) {
534 case _DRM_REGISTERS:
535 drm_core_ioremapfree(map, dev);
536 /* FALLTHROUGH */
537 case _DRM_FRAME_BUFFER:
538 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
539 int retcode;
540 retcode = drm_mtrr_del(map->mtrr, map->offset,
541 map->size, DRM_MTRR_WC);
542 DRM_DEBUG("mtrr_del=%d\n", retcode);
543 }
544 break;
545 case _DRM_SHM:
546 free(map->handle, DRM_MEM_MAPS);
547 if (master) {
548 if (dev->sigdata.lock == master->lock.hw_lock)
549 dev->sigdata.lock = NULL;
550 master->lock.hw_lock = NULL; /* SHM removed */
551 master->lock.file_priv = NULL;
552 DRM_WAKEUP_INT((void *)&master->lock.lock_queue);
553 }
554 break;
555 case _DRM_AGP:
556 case _DRM_SCATTER_GATHER:
557 break;
558 case _DRM_CONSISTENT:
559 drm_pci_free(dev, map->dmah);
560 break;
561 case _DRM_GEM:
562 DRM_ERROR("tried to rmmap GEM object\n");
563 break;
564 }
565 free(map, DRM_MEM_MAPS);
566
567 return 0;
568 }
569 EXPORT_SYMBOL(drm_rmmap_locked);
570
drm_rmmap(struct drm_device * dev,struct drm_local_map * map)571 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
572 {
573 int ret;
574
575 DRM_LOCK(dev);
576 ret = drm_rmmap_locked(dev, map);
577 DRM_UNLOCK(dev);
578
579 return ret;
580 }
581 EXPORT_SYMBOL(drm_rmmap);
582
583 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
584 * the last close of the device, and this is necessary for cleanup when things
585 * exit uncleanly. Therefore, having userland manually remove mappings seems
586 * like a pointless exercise since they're going away anyway.
587 *
588 * One use case might be after addmap is allowed for normal users for SHM and
589 * gets used by drivers that the server doesn't need to care about. This seems
590 * unlikely.
591 *
592 * \param inode device inode.
593 * \param file_priv DRM file private.
594 * \param cmd command.
595 * \param arg pointer to a struct drm_map structure.
596 * \return zero on success or a negative value on error.
597 */
drm_rmmap_ioctl(struct drm_device * dev,void * data,struct drm_file * file_priv)598 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
599 struct drm_file *file_priv)
600 {
601 struct drm_map *request = data;
602 struct drm_local_map *map = NULL;
603 struct drm_map_list *r_list;
604 int ret;
605
606 DRM_LOCK(dev);
607 list_for_each_entry(r_list, &dev->maplist, head) {
608 if (r_list->map &&
609 r_list->user_token == (unsigned long)request->handle &&
610 r_list->map->flags & _DRM_REMOVABLE) {
611 map = r_list->map;
612 break;
613 }
614 }
615
616 /* List has wrapped around to the head pointer, or its empty we didn't
617 * find anything.
618 */
619 if (list_empty(&dev->maplist) || !map) {
620 DRM_UNLOCK(dev);
621 return -EINVAL;
622 }
623
624 /* Register and framebuffer maps are permanent */
625 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
626 DRM_UNLOCK(dev);
627 return 0;
628 }
629
630 ret = drm_rmmap_locked(dev, map);
631
632 DRM_UNLOCK(dev);
633
634 return ret;
635 }
636
637 /**
638 * Cleanup after an error on one of the addbufs() functions.
639 *
640 * \param dev DRM device.
641 * \param entry buffer entry where the error occurred.
642 *
643 * Frees any pages and buffers associated with the given entry.
644 */
drm_cleanup_buf_error(struct drm_device * dev,struct drm_buf_entry * entry)645 static void drm_cleanup_buf_error(struct drm_device * dev,
646 struct drm_buf_entry * entry)
647 {
648 int i;
649
650 if (entry->seg_count) {
651 for (i = 0; i < entry->seg_count; i++) {
652 if (entry->seglist[i]) {
653 drm_pci_free(dev, entry->seglist[i]);
654 }
655 }
656 free(entry->seglist, DRM_MEM_SEGS);
657
658 entry->seg_count = 0;
659 }
660
661 if (entry->buf_count) {
662 for (i = 0; i < entry->buf_count; i++) {
663 free(entry->buflist[i].dev_private, DRM_MEM_BUFS);
664 }
665 free(entry->buflist, DRM_MEM_BUFS);
666
667 entry->buf_count = 0;
668 }
669 }
670
671 #if __OS_HAS_AGP
672 /**
673 * Add AGP buffers for DMA transfers.
674 *
675 * \param dev struct drm_device to which the buffers are to be added.
676 * \param request pointer to a struct drm_buf_desc describing the request.
677 * \return zero on success or a negative number on failure.
678 *
679 * After some sanity checks creates a drm_buf structure for each buffer and
680 * reallocates the buffer list of the same size order to accommodate the new
681 * buffers.
682 */
drm_addbufs_agp(struct drm_device * dev,struct drm_buf_desc * request)683 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
684 {
685 struct drm_device_dma *dma = dev->dma;
686 struct drm_buf_entry *entry;
687 struct drm_agp_mem *agp_entry;
688 struct drm_buf *buf;
689 unsigned long offset;
690 unsigned long agp_offset;
691 int count;
692 int order;
693 int size;
694 int alignment;
695 int page_order;
696 int total;
697 int byte_count;
698 int i, valid;
699 struct drm_buf **temp_buflist;
700
701 if (!dma)
702 return -EINVAL;
703
704 count = request->count;
705 order = drm_order(request->size);
706 size = 1 << order;
707
708 alignment = (request->flags & _DRM_PAGE_ALIGN)
709 ? PAGE_ALIGN(size) : size;
710 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
711 total = PAGE_SIZE << page_order;
712
713 byte_count = 0;
714 agp_offset = dev->agp->base + request->agp_start;
715
716 DRM_DEBUG("count: %d\n", count);
717 DRM_DEBUG("order: %d\n", order);
718 DRM_DEBUG("size: %d\n", size);
719 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
720 DRM_DEBUG("alignment: %d\n", alignment);
721 DRM_DEBUG("page_order: %d\n", page_order);
722 DRM_DEBUG("total: %d\n", total);
723
724 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
725 return -EINVAL;
726
727 /* Make sure buffers are located in AGP memory that we own */
728 valid = 0;
729 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
730 if ((agp_offset >= agp_entry->bound) &&
731 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
732 valid = 1;
733 break;
734 }
735 }
736 if (!list_empty(&dev->agp->memory) && !valid) {
737 DRM_DEBUG("zone invalid\n");
738 return -EINVAL;
739 }
740 mtx_lock(&dev->count_lock);
741 if (dev->buf_use) {
742 mtx_unlock(&dev->count_lock);
743 return -EBUSY;
744 }
745 atomic_inc(&dev->buf_alloc);
746 mtx_unlock(&dev->count_lock);
747
748 DRM_LOCK(dev);
749 entry = &dma->bufs[order];
750 if (entry->buf_count) {
751 DRM_UNLOCK(dev);
752 atomic_dec(&dev->buf_alloc);
753 return -ENOMEM; /* May only call once for each order */
754 }
755
756 if (count < 0 || count > 4096) {
757 DRM_UNLOCK(dev);
758 atomic_dec(&dev->buf_alloc);
759 return -EINVAL;
760 }
761
762 entry->buflist = malloc(count * sizeof(*entry->buflist), DRM_MEM_BUFS,
763 M_NOWAIT | M_ZERO);
764 if (!entry->buflist) {
765 DRM_UNLOCK(dev);
766 atomic_dec(&dev->buf_alloc);
767 return -ENOMEM;
768 }
769
770 entry->buf_size = size;
771 entry->page_order = page_order;
772
773 offset = 0;
774
775 while (entry->buf_count < count) {
776 buf = &entry->buflist[entry->buf_count];
777 buf->idx = dma->buf_count + entry->buf_count;
778 buf->total = alignment;
779 buf->order = order;
780 buf->used = 0;
781
782 buf->offset = (dma->byte_count + offset);
783 buf->bus_address = agp_offset + offset;
784 buf->address = (void *)(agp_offset + offset);
785 buf->next = NULL;
786 buf->waiting = 0;
787 buf->pending = 0;
788 buf->file_priv = NULL;
789
790 buf->dev_priv_size = dev->driver->dev_priv_size;
791 buf->dev_private = malloc(buf->dev_priv_size, DRM_MEM_BUFS,
792 M_NOWAIT | M_ZERO);
793 if (!buf->dev_private) {
794 /* Set count correctly so we free the proper amount. */
795 entry->buf_count = count;
796 drm_cleanup_buf_error(dev, entry);
797 DRM_UNLOCK(dev);
798 atomic_dec(&dev->buf_alloc);
799 return -ENOMEM;
800 }
801
802 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
803
804 offset += alignment;
805 entry->buf_count++;
806 byte_count += PAGE_SIZE << page_order;
807 }
808
809 DRM_DEBUG("byte_count: %d\n", byte_count);
810
811 temp_buflist = realloc(dma->buflist,
812 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist),
813 DRM_MEM_BUFS, M_NOWAIT);
814 if (!temp_buflist) {
815 /* Free the entry because it isn't valid */
816 drm_cleanup_buf_error(dev, entry);
817 DRM_UNLOCK(dev);
818 atomic_dec(&dev->buf_alloc);
819 return -ENOMEM;
820 }
821 dma->buflist = temp_buflist;
822
823 for (i = 0; i < entry->buf_count; i++) {
824 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
825 }
826
827 dma->buf_count += entry->buf_count;
828 dma->seg_count += entry->seg_count;
829 dma->page_count += byte_count >> PAGE_SHIFT;
830 dma->byte_count += byte_count;
831
832 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
833 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
834
835 DRM_UNLOCK(dev);
836
837 request->count = entry->buf_count;
838 request->size = size;
839
840 dma->flags = _DRM_DMA_USE_AGP;
841
842 atomic_dec(&dev->buf_alloc);
843 return 0;
844 }
845 EXPORT_SYMBOL(drm_addbufs_agp);
846 #endif /* __OS_HAS_AGP */
847
drm_addbufs_pci(struct drm_device * dev,struct drm_buf_desc * request)848 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
849 {
850 struct drm_device_dma *dma = dev->dma;
851 int count;
852 int order;
853 int size;
854 int total;
855 int page_order;
856 struct drm_buf_entry *entry;
857 drm_dma_handle_t *dmah;
858 struct drm_buf *buf;
859 int alignment;
860 unsigned long offset;
861 int i;
862 int byte_count;
863 int page_count;
864 unsigned long *temp_pagelist;
865 struct drm_buf **temp_buflist;
866
867 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
868 return -EINVAL;
869
870 if (!dma)
871 return -EINVAL;
872
873 if (!DRM_SUSER(DRM_CURPROC))
874 return -EPERM;
875
876 count = request->count;
877 order = drm_order(request->size);
878 size = 1 << order;
879
880 DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
881 request->count, request->size, size, order);
882
883 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
884 return -EINVAL;
885
886 alignment = (request->flags & _DRM_PAGE_ALIGN)
887 ? PAGE_ALIGN(size) : size;
888 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
889 total = PAGE_SIZE << page_order;
890
891 mtx_lock(&dev->count_lock);
892 if (dev->buf_use) {
893 mtx_unlock(&dev->count_lock);
894 return -EBUSY;
895 }
896 atomic_inc(&dev->buf_alloc);
897 mtx_unlock(&dev->count_lock);
898
899 DRM_LOCK(dev);
900 entry = &dma->bufs[order];
901 if (entry->buf_count) {
902 DRM_UNLOCK(dev);
903 atomic_dec(&dev->buf_alloc);
904 return -ENOMEM; /* May only call once for each order */
905 }
906
907 if (count < 0 || count > 4096) {
908 DRM_UNLOCK(dev);
909 atomic_dec(&dev->buf_alloc);
910 return -EINVAL;
911 }
912
913 entry->buflist = malloc(count * sizeof(*entry->buflist), DRM_MEM_BUFS,
914 M_NOWAIT | M_ZERO);
915 if (!entry->buflist) {
916 DRM_UNLOCK(dev);
917 atomic_dec(&dev->buf_alloc);
918 return -ENOMEM;
919 }
920
921 entry->seglist = malloc(count * sizeof(*entry->seglist), DRM_MEM_SEGS,
922 M_NOWAIT | M_ZERO);
923 if (!entry->seglist) {
924 free(entry->buflist, DRM_MEM_BUFS);
925 DRM_UNLOCK(dev);
926 atomic_dec(&dev->buf_alloc);
927 return -ENOMEM;
928 }
929
930 /* Keep the original pagelist until we know all the allocations
931 * have succeeded
932 */
933 temp_pagelist = malloc((dma->page_count + (count << page_order)) *
934 sizeof(*dma->pagelist), DRM_MEM_PAGES, M_NOWAIT);
935 if (!temp_pagelist) {
936 free(entry->buflist, DRM_MEM_BUFS);
937 free(entry->seglist, DRM_MEM_SEGS);
938 DRM_UNLOCK(dev);
939 atomic_dec(&dev->buf_alloc);
940 return -ENOMEM;
941 }
942 memcpy(temp_pagelist,
943 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
944 DRM_DEBUG("pagelist: %d entries\n",
945 dma->page_count + (count << page_order));
946
947 entry->buf_size = size;
948 entry->page_order = page_order;
949 byte_count = 0;
950 page_count = 0;
951
952 while (entry->buf_count < count) {
953
954 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, BUS_SPACE_MAXADDR);
955
956 if (!dmah) {
957 /* Set count correctly so we free the proper amount. */
958 entry->buf_count = count;
959 entry->seg_count = count;
960 drm_cleanup_buf_error(dev, entry);
961 free(temp_pagelist, DRM_MEM_PAGES);
962 DRM_UNLOCK(dev);
963 atomic_dec(&dev->buf_alloc);
964 return -ENOMEM;
965 }
966 entry->seglist[entry->seg_count++] = dmah;
967 for (i = 0; i < (1 << page_order); i++) {
968 DRM_DEBUG("page %d @ 0x%08lx\n",
969 dma->page_count + page_count,
970 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
971 temp_pagelist[dma->page_count + page_count++]
972 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
973 }
974 for (offset = 0;
975 offset + size <= total && entry->buf_count < count;
976 offset += alignment, ++entry->buf_count) {
977 buf = &entry->buflist[entry->buf_count];
978 buf->idx = dma->buf_count + entry->buf_count;
979 buf->total = alignment;
980 buf->order = order;
981 buf->used = 0;
982 buf->offset = (dma->byte_count + byte_count + offset);
983 buf->address = (void *)((char *)dmah->vaddr + offset);
984 buf->bus_address = dmah->busaddr + offset;
985 buf->next = NULL;
986 buf->waiting = 0;
987 buf->pending = 0;
988 buf->file_priv = NULL;
989
990 buf->dev_priv_size = dev->driver->dev_priv_size;
991 buf->dev_private = malloc(buf->dev_priv_size,
992 DRM_MEM_BUFS, M_NOWAIT | M_ZERO);
993 if (!buf->dev_private) {
994 /* Set count correctly so we free the proper amount. */
995 entry->buf_count = count;
996 entry->seg_count = count;
997 drm_cleanup_buf_error(dev, entry);
998 free(temp_pagelist, DRM_MEM_PAGES);
999 DRM_UNLOCK(dev);
1000 atomic_dec(&dev->buf_alloc);
1001 return -ENOMEM;
1002 }
1003
1004 DRM_DEBUG("buffer %d @ %p\n",
1005 entry->buf_count, buf->address);
1006 }
1007 byte_count += PAGE_SIZE << page_order;
1008 }
1009
1010 temp_buflist = realloc(dma->buflist,
1011 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist),
1012 DRM_MEM_BUFS, M_NOWAIT);
1013 if (!temp_buflist) {
1014 /* Free the entry because it isn't valid */
1015 drm_cleanup_buf_error(dev, entry);
1016 free(temp_pagelist, DRM_MEM_PAGES);
1017 DRM_UNLOCK(dev);
1018 atomic_dec(&dev->buf_alloc);
1019 return -ENOMEM;
1020 }
1021 dma->buflist = temp_buflist;
1022
1023 for (i = 0; i < entry->buf_count; i++) {
1024 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1025 }
1026
1027 /* No allocations failed, so now we can replace the original pagelist
1028 * with the new one.
1029 */
1030 if (dma->page_count) {
1031 free(dma->pagelist, DRM_MEM_PAGES);
1032 }
1033 dma->pagelist = temp_pagelist;
1034
1035 dma->buf_count += entry->buf_count;
1036 dma->seg_count += entry->seg_count;
1037 dma->page_count += entry->seg_count << page_order;
1038 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1039
1040 DRM_UNLOCK(dev);
1041
1042 request->count = entry->buf_count;
1043 request->size = size;
1044
1045 if (request->flags & _DRM_PCI_BUFFER_RO)
1046 dma->flags = _DRM_DMA_USE_PCI_RO;
1047
1048 atomic_dec(&dev->buf_alloc);
1049 return 0;
1050
1051 }
1052 EXPORT_SYMBOL(drm_addbufs_pci);
1053
drm_addbufs_sg(struct drm_device * dev,struct drm_buf_desc * request)1054 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
1055 {
1056 struct drm_device_dma *dma = dev->dma;
1057 struct drm_buf_entry *entry;
1058 struct drm_buf *buf;
1059 unsigned long offset;
1060 unsigned long agp_offset;
1061 int count;
1062 int order;
1063 int size;
1064 int alignment;
1065 int page_order;
1066 int total;
1067 int byte_count;
1068 int i;
1069 struct drm_buf **temp_buflist;
1070
1071 if (!drm_core_check_feature(dev, DRIVER_SG))
1072 return -EINVAL;
1073
1074 if (!dma)
1075 return -EINVAL;
1076
1077 if (!DRM_SUSER(DRM_CURPROC))
1078 return -EPERM;
1079
1080 count = request->count;
1081 order = drm_order(request->size);
1082 size = 1 << order;
1083
1084 alignment = (request->flags & _DRM_PAGE_ALIGN)
1085 ? PAGE_ALIGN(size) : size;
1086 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1087 total = PAGE_SIZE << page_order;
1088
1089 byte_count = 0;
1090 agp_offset = request->agp_start;
1091
1092 DRM_DEBUG("count: %d\n", count);
1093 DRM_DEBUG("order: %d\n", order);
1094 DRM_DEBUG("size: %d\n", size);
1095 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1096 DRM_DEBUG("alignment: %d\n", alignment);
1097 DRM_DEBUG("page_order: %d\n", page_order);
1098 DRM_DEBUG("total: %d\n", total);
1099
1100 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1101 return -EINVAL;
1102
1103 mtx_lock(&dev->count_lock);
1104 if (dev->buf_use) {
1105 mtx_unlock(&dev->count_lock);
1106 return -EBUSY;
1107 }
1108 atomic_inc(&dev->buf_alloc);
1109 mtx_unlock(&dev->count_lock);
1110
1111 DRM_LOCK(dev);
1112 entry = &dma->bufs[order];
1113 if (entry->buf_count) {
1114 DRM_UNLOCK(dev);
1115 atomic_dec(&dev->buf_alloc);
1116 return -ENOMEM; /* May only call once for each order */
1117 }
1118
1119 if (count < 0 || count > 4096) {
1120 DRM_UNLOCK(dev);
1121 atomic_dec(&dev->buf_alloc);
1122 return -EINVAL;
1123 }
1124
1125 entry->buflist = malloc(count * sizeof(*entry->buflist), DRM_MEM_BUFS,
1126 M_NOWAIT | M_ZERO);
1127 if (!entry->buflist) {
1128 DRM_UNLOCK(dev);
1129 atomic_dec(&dev->buf_alloc);
1130 return -ENOMEM;
1131 }
1132
1133 entry->buf_size = size;
1134 entry->page_order = page_order;
1135
1136 offset = 0;
1137
1138 while (entry->buf_count < count) {
1139 buf = &entry->buflist[entry->buf_count];
1140 buf->idx = dma->buf_count + entry->buf_count;
1141 buf->total = alignment;
1142 buf->order = order;
1143 buf->used = 0;
1144
1145 buf->offset = (dma->byte_count + offset);
1146 buf->bus_address = agp_offset + offset;
1147 buf->address = (void *)(agp_offset + offset
1148 + (unsigned long)dev->sg->vaddr);
1149 buf->next = NULL;
1150 buf->waiting = 0;
1151 buf->pending = 0;
1152 buf->file_priv = NULL;
1153
1154 buf->dev_priv_size = dev->driver->dev_priv_size;
1155 buf->dev_private = malloc(buf->dev_priv_size, DRM_MEM_BUFS,
1156 M_NOWAIT | M_ZERO);
1157 if (!buf->dev_private) {
1158 /* Set count correctly so we free the proper amount. */
1159 entry->buf_count = count;
1160 drm_cleanup_buf_error(dev, entry);
1161 DRM_UNLOCK(dev);
1162 atomic_dec(&dev->buf_alloc);
1163 return -ENOMEM;
1164 }
1165
1166 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1167
1168 offset += alignment;
1169 entry->buf_count++;
1170 byte_count += PAGE_SIZE << page_order;
1171 }
1172
1173 DRM_DEBUG("byte_count: %d\n", byte_count);
1174
1175 temp_buflist = realloc(dma->buflist,
1176 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist),
1177 DRM_MEM_BUFS, M_NOWAIT);
1178 if (!temp_buflist) {
1179 /* Free the entry because it isn't valid */
1180 drm_cleanup_buf_error(dev, entry);
1181 DRM_UNLOCK(dev);
1182 atomic_dec(&dev->buf_alloc);
1183 return -ENOMEM;
1184 }
1185 dma->buflist = temp_buflist;
1186
1187 for (i = 0; i < entry->buf_count; i++) {
1188 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1189 }
1190
1191 dma->buf_count += entry->buf_count;
1192 dma->seg_count += entry->seg_count;
1193 dma->page_count += byte_count >> PAGE_SHIFT;
1194 dma->byte_count += byte_count;
1195
1196 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1197 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1198
1199 DRM_UNLOCK(dev);
1200
1201 request->count = entry->buf_count;
1202 request->size = size;
1203
1204 dma->flags = _DRM_DMA_USE_SG;
1205
1206 atomic_dec(&dev->buf_alloc);
1207 return 0;
1208 }
1209
drm_addbufs_fb(struct drm_device * dev,struct drm_buf_desc * request)1210 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1211 {
1212 struct drm_device_dma *dma = dev->dma;
1213 struct drm_buf_entry *entry;
1214 struct drm_buf *buf;
1215 unsigned long offset;
1216 unsigned long agp_offset;
1217 int count;
1218 int order;
1219 int size;
1220 int alignment;
1221 int page_order;
1222 int total;
1223 int byte_count;
1224 int i;
1225 struct drm_buf **temp_buflist;
1226
1227 if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1228 return -EINVAL;
1229
1230 if (!dma)
1231 return -EINVAL;
1232
1233 if (!DRM_SUSER(DRM_CURPROC))
1234 return -EPERM;
1235
1236 count = request->count;
1237 order = drm_order(request->size);
1238 size = 1 << order;
1239
1240 alignment = (request->flags & _DRM_PAGE_ALIGN)
1241 ? PAGE_ALIGN(size) : size;
1242 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1243 total = PAGE_SIZE << page_order;
1244
1245 byte_count = 0;
1246 agp_offset = request->agp_start;
1247
1248 DRM_DEBUG("count: %d\n", count);
1249 DRM_DEBUG("order: %d\n", order);
1250 DRM_DEBUG("size: %d\n", size);
1251 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1252 DRM_DEBUG("alignment: %d\n", alignment);
1253 DRM_DEBUG("page_order: %d\n", page_order);
1254 DRM_DEBUG("total: %d\n", total);
1255
1256 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1257 return -EINVAL;
1258
1259 mtx_lock(&dev->count_lock);
1260 if (dev->buf_use) {
1261 mtx_unlock(&dev->count_lock);
1262 return -EBUSY;
1263 }
1264 atomic_inc(&dev->buf_alloc);
1265 mtx_unlock(&dev->count_lock);
1266
1267 DRM_LOCK(dev);
1268 entry = &dma->bufs[order];
1269 if (entry->buf_count) {
1270 DRM_UNLOCK(dev);
1271 atomic_dec(&dev->buf_alloc);
1272 return -ENOMEM; /* May only call once for each order */
1273 }
1274
1275 if (count < 0 || count > 4096) {
1276 DRM_UNLOCK(dev);
1277 atomic_dec(&dev->buf_alloc);
1278 return -EINVAL;
1279 }
1280
1281 entry->buflist = malloc(count * sizeof(*entry->buflist), DRM_MEM_BUFS,
1282 M_NOWAIT | M_ZERO);
1283 if (!entry->buflist) {
1284 DRM_UNLOCK(dev);
1285 atomic_dec(&dev->buf_alloc);
1286 return -ENOMEM;
1287 }
1288
1289 entry->buf_size = size;
1290 entry->page_order = page_order;
1291
1292 offset = 0;
1293
1294 while (entry->buf_count < count) {
1295 buf = &entry->buflist[entry->buf_count];
1296 buf->idx = dma->buf_count + entry->buf_count;
1297 buf->total = alignment;
1298 buf->order = order;
1299 buf->used = 0;
1300
1301 buf->offset = (dma->byte_count + offset);
1302 buf->bus_address = agp_offset + offset;
1303 buf->address = (void *)(agp_offset + offset);
1304 buf->next = NULL;
1305 buf->waiting = 0;
1306 buf->pending = 0;
1307 buf->file_priv = NULL;
1308
1309 buf->dev_priv_size = dev->driver->dev_priv_size;
1310 buf->dev_private = malloc(buf->dev_priv_size, DRM_MEM_BUFS,
1311 M_NOWAIT | M_ZERO);
1312 if (!buf->dev_private) {
1313 /* Set count correctly so we free the proper amount. */
1314 entry->buf_count = count;
1315 drm_cleanup_buf_error(dev, entry);
1316 DRM_UNLOCK(dev);
1317 atomic_dec(&dev->buf_alloc);
1318 return -ENOMEM;
1319 }
1320
1321 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1322
1323 offset += alignment;
1324 entry->buf_count++;
1325 byte_count += PAGE_SIZE << page_order;
1326 }
1327
1328 DRM_DEBUG("byte_count: %d\n", byte_count);
1329
1330 temp_buflist = realloc(dma->buflist,
1331 (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist),
1332 DRM_MEM_BUFS, M_NOWAIT);
1333 if (!temp_buflist) {
1334 /* Free the entry because it isn't valid */
1335 drm_cleanup_buf_error(dev, entry);
1336 DRM_UNLOCK(dev);
1337 atomic_dec(&dev->buf_alloc);
1338 return -ENOMEM;
1339 }
1340 dma->buflist = temp_buflist;
1341
1342 for (i = 0; i < entry->buf_count; i++) {
1343 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1344 }
1345
1346 dma->buf_count += entry->buf_count;
1347 dma->seg_count += entry->seg_count;
1348 dma->page_count += byte_count >> PAGE_SHIFT;
1349 dma->byte_count += byte_count;
1350
1351 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1352 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1353
1354 DRM_UNLOCK(dev);
1355
1356 request->count = entry->buf_count;
1357 request->size = size;
1358
1359 dma->flags = _DRM_DMA_USE_FB;
1360
1361 atomic_dec(&dev->buf_alloc);
1362 return 0;
1363 }
1364
1365
1366 /**
1367 * Add buffers for DMA transfers (ioctl).
1368 *
1369 * \param inode device inode.
1370 * \param file_priv DRM file private.
1371 * \param cmd command.
1372 * \param arg pointer to a struct drm_buf_desc request.
1373 * \return zero on success or a negative number on failure.
1374 *
1375 * According with the memory type specified in drm_buf_desc::flags and the
1376 * build options, it dispatches the call either to addbufs_agp(),
1377 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1378 * PCI memory respectively.
1379 */
drm_addbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1380 int drm_addbufs(struct drm_device *dev, void *data,
1381 struct drm_file *file_priv)
1382 {
1383 struct drm_buf_desc *request = data;
1384 int ret;
1385
1386 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1387 return -EINVAL;
1388
1389 #if __OS_HAS_AGP
1390 if (request->flags & _DRM_AGP_BUFFER)
1391 ret = drm_addbufs_agp(dev, request);
1392 else
1393 #endif
1394 if (request->flags & _DRM_SG_BUFFER)
1395 ret = drm_addbufs_sg(dev, request);
1396 else if (request->flags & _DRM_FB_BUFFER)
1397 ret = drm_addbufs_fb(dev, request);
1398 else
1399 ret = drm_addbufs_pci(dev, request);
1400
1401 return ret;
1402 }
1403
1404 /**
1405 * Get information about the buffer mappings.
1406 *
1407 * This was originally mean for debugging purposes, or by a sophisticated
1408 * client library to determine how best to use the available buffers (e.g.,
1409 * large buffers can be used for image transfer).
1410 *
1411 * \param inode device inode.
1412 * \param file_priv DRM file private.
1413 * \param cmd command.
1414 * \param arg pointer to a drm_buf_info structure.
1415 * \return zero on success or a negative number on failure.
1416 *
1417 * Increments drm_device::buf_use while holding the drm_device::count_lock
1418 * lock, preventing of allocating more buffers after this call. Information
1419 * about each requested buffer is then copied into user space.
1420 */
drm_infobufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1421 int drm_infobufs(struct drm_device *dev, void *data,
1422 struct drm_file *file_priv)
1423 {
1424 struct drm_device_dma *dma = dev->dma;
1425 struct drm_buf_info *request = data;
1426 int i;
1427 int count;
1428
1429 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1430 return -EINVAL;
1431
1432 if (!dma)
1433 return -EINVAL;
1434
1435 mtx_lock(&dev->count_lock);
1436 if (atomic_read(&dev->buf_alloc)) {
1437 mtx_unlock(&dev->count_lock);
1438 return -EBUSY;
1439 }
1440 ++dev->buf_use; /* Can't allocate more after this call */
1441 mtx_unlock(&dev->count_lock);
1442
1443 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1444 if (dma->bufs[i].buf_count)
1445 ++count;
1446 }
1447
1448 DRM_DEBUG("count = %d\n", count);
1449
1450 if (request->count >= count) {
1451 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1452 if (dma->bufs[i].buf_count) {
1453 struct drm_buf_desc __user *to =
1454 &request->list[count];
1455 struct drm_buf_entry *from = &dma->bufs[i];
1456 struct drm_freelist *list = &dma->bufs[i].freelist;
1457 if (copy_to_user(&to->count,
1458 &from->buf_count,
1459 sizeof(from->buf_count)) ||
1460 copy_to_user(&to->size,
1461 &from->buf_size,
1462 sizeof(from->buf_size)) ||
1463 copy_to_user(&to->low_mark,
1464 &list->low_mark,
1465 sizeof(list->low_mark)) ||
1466 copy_to_user(&to->high_mark,
1467 &list->high_mark,
1468 sizeof(list->high_mark)))
1469 return -EFAULT;
1470
1471 DRM_DEBUG("%d %d %d %d %d\n",
1472 i,
1473 dma->bufs[i].buf_count,
1474 dma->bufs[i].buf_size,
1475 dma->bufs[i].freelist.low_mark,
1476 dma->bufs[i].freelist.high_mark);
1477 ++count;
1478 }
1479 }
1480 }
1481 request->count = count;
1482
1483 return 0;
1484 }
1485
1486 /**
1487 * Specifies a low and high water mark for buffer allocation
1488 *
1489 * \param inode device inode.
1490 * \param file_priv DRM file private.
1491 * \param cmd command.
1492 * \param arg a pointer to a drm_buf_desc structure.
1493 * \return zero on success or a negative number on failure.
1494 *
1495 * Verifies that the size order is bounded between the admissible orders and
1496 * updates the respective drm_device_dma::bufs entry low and high water mark.
1497 *
1498 * \note This ioctl is deprecated and mostly never used.
1499 */
drm_markbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1500 int drm_markbufs(struct drm_device *dev, void *data,
1501 struct drm_file *file_priv)
1502 {
1503 struct drm_device_dma *dma = dev->dma;
1504 struct drm_buf_desc *request = data;
1505 int order;
1506 struct drm_buf_entry *entry;
1507
1508 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1509 return -EINVAL;
1510
1511 if (!dma)
1512 return -EINVAL;
1513
1514 DRM_DEBUG("%d, %d, %d\n",
1515 request->size, request->low_mark, request->high_mark);
1516 order = drm_order(request->size);
1517 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1518 return -EINVAL;
1519 entry = &dma->bufs[order];
1520
1521 if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1522 return -EINVAL;
1523 if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1524 return -EINVAL;
1525
1526 entry->freelist.low_mark = request->low_mark;
1527 entry->freelist.high_mark = request->high_mark;
1528
1529 return 0;
1530 }
1531
1532 /**
1533 * Unreserve the buffers in list, previously reserved using drmDMA.
1534 *
1535 * \param inode device inode.
1536 * \param file_priv DRM file private.
1537 * \param cmd command.
1538 * \param arg pointer to a drm_buf_free structure.
1539 * \return zero on success or a negative number on failure.
1540 *
1541 * Calls free_buffer() for each used buffer.
1542 * This function is primarily used for debugging.
1543 */
drm_freebufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1544 int drm_freebufs(struct drm_device *dev, void *data,
1545 struct drm_file *file_priv)
1546 {
1547 struct drm_device_dma *dma = dev->dma;
1548 struct drm_buf_free *request = data;
1549 int i;
1550 int idx;
1551 struct drm_buf *buf;
1552
1553 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1554 return -EINVAL;
1555
1556 if (!dma)
1557 return -EINVAL;
1558
1559 DRM_DEBUG("%d\n", request->count);
1560 for (i = 0; i < request->count; i++) {
1561 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1562 return -EFAULT;
1563 if (idx < 0 || idx >= dma->buf_count) {
1564 DRM_ERROR("Index %d (of %d max)\n",
1565 idx, dma->buf_count - 1);
1566 return -EINVAL;
1567 }
1568 buf = dma->buflist[idx];
1569 if (buf->file_priv != file_priv) {
1570 DRM_ERROR("Process %d freeing buffer not owned\n",
1571 DRM_CURRENTPID);
1572 return -EINVAL;
1573 }
1574 drm_free_buffer(dev, buf);
1575 }
1576
1577 return 0;
1578 }
1579
1580 /**
1581 * Maps all of the DMA buffers into client-virtual space (ioctl).
1582 *
1583 * \param inode device inode.
1584 * \param file_priv DRM file private.
1585 * \param cmd command.
1586 * \param arg pointer to a drm_buf_map structure.
1587 * \return zero on success or a negative number on failure.
1588 *
1589 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1590 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1591 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1592 * drm_mmap_dma().
1593 */
drm_mapbufs(struct drm_device * dev,void * data,struct drm_file * file_priv)1594 int drm_mapbufs(struct drm_device *dev, void *data,
1595 struct drm_file *file_priv)
1596 {
1597 struct drm_device_dma *dma = dev->dma;
1598 int retcode = 0;
1599 const int zero = 0;
1600 vm_offset_t virtual;
1601 vm_offset_t address;
1602 struct vmspace *vms;
1603 struct drm_buf_map *request = data;
1604 int i;
1605
1606 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1607 return -EINVAL;
1608
1609 if (!dma)
1610 return -EINVAL;
1611
1612 mtx_lock(&dev->count_lock);
1613 if (atomic_read(&dev->buf_alloc)) {
1614 mtx_unlock(&dev->count_lock);
1615 return -EBUSY;
1616 }
1617 dev->buf_use++; /* Can't allocate more after this call */
1618 mtx_unlock(&dev->count_lock);
1619
1620 vms = DRM_CURPROC->td_proc->p_vmspace;
1621
1622 if (request->count >= dma->buf_count) {
1623 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1624 || (drm_core_check_feature(dev, DRIVER_SG)
1625 && (dma->flags & _DRM_DMA_USE_SG))
1626 || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1627 && (dma->flags & _DRM_DMA_USE_FB))) {
1628 struct drm_local_map *map = dev->agp_buffer_map;
1629 vm_ooffset_t token = dev->agp_buffer_token;
1630
1631 if (!map) {
1632 retcode = -EINVAL;
1633 goto done;
1634 }
1635 retcode = vm_mmap(&vms->vm_map, &virtual, map->size,
1636 VM_PROT_RW, VM_PROT_RW, MAP_SHARED | MAP_NOSYNC,
1637 OBJT_DEVICE, file_priv->minor->device, token);
1638 } else {
1639 retcode = vm_mmap(&vms->vm_map, &virtual, dma->byte_count,
1640 VM_PROT_RW, VM_PROT_RW, MAP_SHARED | MAP_NOSYNC,
1641 OBJT_DEVICE, file_priv->minor->device, 0);
1642 }
1643 if (retcode) {
1644 /* Real error */
1645 retcode = -retcode;
1646 goto done;
1647 }
1648 request->virtual = (void __user *)virtual;
1649
1650 for (i = 0; i < dma->buf_count; i++) {
1651 if (copy_to_user(&request->list[i].idx,
1652 &dma->buflist[i]->idx,
1653 sizeof(request->list[0].idx))) {
1654 retcode = -EFAULT;
1655 goto done;
1656 }
1657 if (copy_to_user(&request->list[i].total,
1658 &dma->buflist[i]->total,
1659 sizeof(request->list[0].total))) {
1660 retcode = -EFAULT;
1661 goto done;
1662 }
1663 if (copy_to_user(&request->list[i].used,
1664 &zero, sizeof(zero))) {
1665 retcode = -EFAULT;
1666 goto done;
1667 }
1668 address = virtual + dma->buflist[i]->offset; /* *** */
1669 if (copy_to_user(&request->list[i].address,
1670 &address, sizeof(address))) {
1671 retcode = -EFAULT;
1672 goto done;
1673 }
1674 }
1675 }
1676 done:
1677 request->count = dma->buf_count;
1678 DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1679
1680 return retcode;
1681 }
1682
1683 /**
1684 * Compute size order. Returns the exponent of the smaller power of two which
1685 * is greater or equal to given number.
1686 *
1687 * \param size size.
1688 * \return order.
1689 *
1690 * \todo Can be made faster.
1691 */
drm_order(unsigned long size)1692 int drm_order(unsigned long size)
1693 {
1694 int order;
1695 unsigned long tmp;
1696
1697 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1698
1699 if (size & (size - 1))
1700 ++order;
1701
1702 return order;
1703 }
1704 EXPORT_SYMBOL(drm_order);
1705