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