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12715d3c078d6e9d111c265fe96b5ccc63961d3e
[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 unsigned long 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 unsigned long 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 drm_local_map_t *map)
54 {
55 struct drm_map_list *entry;
56 list_for_each_entry(entry, &dev->maplist, head) {
57 if (entry->map && (entry->master == dev->primary->master) && (map->type == entry->map->type) &&
58 ((entry->map->offset == map->offset) ||
59 ((map->type == _DRM_SHM) && (map->flags&_DRM_CONTAINS_LOCK)))) {
60 return entry;
61 }
62 }
63
64 return NULL;
65 }
66
67 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
68 unsigned long user_token, int hashed_handle)
69 {
70 int use_hashed_handle;
71 #if (BITS_PER_LONG == 64)
72 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
73 #elif (BITS_PER_LONG == 32)
74 use_hashed_handle = hashed_handle;
75 #else
76 #error Unsupported long size. Neither 64 nor 32 bits.
77 #endif
78
79 if (!use_hashed_handle) {
80 int ret;
81 hash->key = user_token >> PAGE_SHIFT;
82 ret = drm_ht_insert_item(&dev->map_hash, hash);
83 if (ret != -EINVAL)
84 return ret;
85 }
86 return drm_ht_just_insert_please(&dev->map_hash, hash,
87 user_token, 32 - PAGE_SHIFT - 3,
88 0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT);
89 }
90
91 /**
92 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
93 *
94 * \param inode device inode.
95 * \param file_priv DRM file private.
96 * \param cmd command.
97 * \param arg pointer to a drm_map structure.
98 * \return zero on success or a negative value on error.
99 *
100 * Adjusts the memory offset to its absolute value according to the mapping
101 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
102 * applicable and if supported by the kernel.
103 */
104 static int drm_addmap_core(struct drm_device * dev, unsigned int offset,
105 unsigned int size, enum drm_map_type type,
106 enum drm_map_flags flags,
107 struct drm_map_list ** maplist)
108 {
109 struct drm_map *map;
110 struct drm_map_list *list;
111 drm_dma_handle_t *dmah;
112 unsigned long user_token;
113 int ret;
114
115 map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
116 if (!map)
117 return -ENOMEM;
118
119 map->offset = offset;
120 map->size = size;
121 map->flags = flags;
122 map->type = type;
123
124 /* Only allow shared memory to be removable since we only keep enough
125 * book keeping information about shared memory to allow for removal
126 * when processes fork.
127 */
128 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
129 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
130 return -EINVAL;
131 }
132 DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
133 map->offset, map->size, map->type);
134 if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
135 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
136 return -EINVAL;
137 }
138 map->mtrr = -1;
139 map->handle = NULL;
140
141 switch (map->type) {
142 case _DRM_REGISTERS:
143 case _DRM_FRAME_BUFFER:
144 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
145 if (map->offset + (map->size-1) < map->offset ||
146 map->offset < virt_to_phys(high_memory)) {
147 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
148 return -EINVAL;
149 }
150 #endif
151 #ifdef __alpha__
152 map->offset += dev->hose->mem_space->start;
153 #endif
154 /* Some drivers preinitialize some maps, without the X Server
155 * needing to be aware of it. Therefore, we just return success
156 * when the server tries to create a duplicate map.
157 */
158 list = drm_find_matching_map(dev, map);
159 if (list != NULL) {
160 if (list->map->size != map->size) {
161 DRM_DEBUG("Matching maps of type %d with "
162 "mismatched sizes, (%ld vs %ld)\n",
163 map->type, map->size,
164 list->map->size);
165 list->map->size = map->size;
166 }
167
168 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
169 *maplist = list;
170 return 0;
171 }
172
173 if (drm_core_has_MTRR(dev)) {
174 if (map->type == _DRM_FRAME_BUFFER ||
175 (map->flags & _DRM_WRITE_COMBINING)) {
176 map->mtrr = mtrr_add(map->offset, map->size,
177 MTRR_TYPE_WRCOMB, 1);
178 }
179 }
180 if (map->type == _DRM_REGISTERS) {
181 map->handle = ioremap(map->offset, map->size);
182 if (!map->handle) {
183 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
184 return -ENOMEM;
185 }
186 }
187
188 break;
189 case _DRM_SHM:
190 list = drm_find_matching_map(dev, map);
191 if (list != NULL) {
192 if(list->map->size != map->size) {
193 DRM_DEBUG("Matching maps of type %d with "
194 "mismatched sizes, (%ld vs %ld)\n",
195 map->type, map->size, list->map->size);
196 list->map->size = map->size;
197 }
198
199 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
200 *maplist = list;
201 return 0;
202 }
203 map->handle = vmalloc_user(map->size);
204 DRM_DEBUG("%lu %d %p\n",
205 map->size, drm_order(map->size), map->handle);
206 if (!map->handle) {
207 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
208 return -ENOMEM;
209 }
210 map->offset = (unsigned long)map->handle;
211 if (map->flags & _DRM_CONTAINS_LOCK) {
212 /* Prevent a 2nd X Server from creating a 2nd lock */
213 if (dev->primary->master->lock.hw_lock != NULL) {
214 vfree(map->handle);
215 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
216 return -EBUSY;
217 }
218 dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */
219 }
220 break;
221 case _DRM_AGP: {
222 struct drm_agp_mem *entry;
223 int valid = 0;
224
225 if (!drm_core_has_AGP(dev)) {
226 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
227 return -EINVAL;
228 }
229 #ifdef __alpha__
230 map->offset += dev->hose->mem_space->start;
231 #endif
232 /* In some cases (i810 driver), user space may have already
233 * added the AGP base itself, because dev->agp->base previously
234 * only got set during AGP enable. So, only add the base
235 * address if the map's offset isn't already within the
236 * aperture.
237 */
238 if (map->offset < dev->agp->base ||
239 map->offset > dev->agp->base +
240 dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
241 map->offset += dev->agp->base;
242 }
243 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
244
245 /* This assumes the DRM is in total control of AGP space.
246 * It's not always the case as AGP can be in the control
247 * of user space (i.e. i810 driver). So this loop will get
248 * skipped and we double check that dev->agp->memory is
249 * actually set as well as being invalid before EPERM'ing
250 */
251 list_for_each_entry(entry, &dev->agp->memory, head) {
252 if ((map->offset >= entry->bound) &&
253 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
254 valid = 1;
255 break;
256 }
257 }
258 if (!list_empty(&dev->agp->memory) && !valid) {
259 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
260 return -EPERM;
261 }
262 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
263
264 break;
265 case _DRM_GEM:
266 DRM_ERROR("tried to rmmap GEM object\n");
267 break;
268 }
269 case _DRM_SCATTER_GATHER:
270 if (!dev->sg) {
271 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
272 return -EINVAL;
273 }
274 map->offset += (unsigned long)dev->sg->virtual;
275 break;
276 case _DRM_CONSISTENT:
277 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
278 * As we're limiting the address to 2^32-1 (or less),
279 * casting it down to 32 bits is no problem, but we
280 * need to point to a 64bit variable first. */
281 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
282 if (!dmah) {
283 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
284 return -ENOMEM;
285 }
286 map->handle = dmah->vaddr;
287 map->offset = (unsigned long)dmah->busaddr;
288 kfree(dmah);
289 break;
290 default:
291 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
292 return -EINVAL;
293 }
294
295 list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
296 if (!list) {
297 if (map->type == _DRM_REGISTERS)
298 iounmap(map->handle);
299 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
300 return -EINVAL;
301 }
302 memset(list, 0, sizeof(*list));
303 list->map = map;
304
305 mutex_lock(&dev->struct_mutex);
306 list_add(&list->head, &dev->maplist);
307
308 /* Assign a 32-bit handle */
309 /* We do it here so that dev->struct_mutex protects the increment */
310 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
311 map->offset;
312 ret = drm_map_handle(dev, &list->hash, user_token, 0);
313 if (ret) {
314 if (map->type == _DRM_REGISTERS)
315 iounmap(map->handle);
316 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
317 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
318 mutex_unlock(&dev->struct_mutex);
319 return ret;
320 }
321
322 list->user_token = list->hash.key << PAGE_SHIFT;
323 mutex_unlock(&dev->struct_mutex);
324
325 list->master = dev->primary->master;
326 *maplist = list;
327 return 0;
328 }
329
330 int drm_addmap(struct drm_device * dev, unsigned int offset,
331 unsigned int size, enum drm_map_type type,
332 enum drm_map_flags flags, drm_local_map_t ** map_ptr)
333 {
334 struct drm_map_list *list;
335 int rc;
336
337 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
338 if (!rc)
339 *map_ptr = list->map;
340 return rc;
341 }
342
343 EXPORT_SYMBOL(drm_addmap);
344
345 int drm_addmap_ioctl(struct drm_device *dev, void *data,
346 struct drm_file *file_priv)
347 {
348 struct drm_map *map = data;
349 struct drm_map_list *maplist;
350 int err;
351
352 if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
353 return -EPERM;
354
355 err = drm_addmap_core(dev, map->offset, map->size, map->type,
356 map->flags, &maplist);
357
358 if (err)
359 return err;
360
361 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
362 map->handle = (void *)(unsigned long)maplist->user_token;
363 return 0;
364 }
365
366 /**
367 * Remove a map private from list and deallocate resources if the mapping
368 * isn't in use.
369 *
370 * \param inode device inode.
371 * \param file_priv DRM file private.
372 * \param cmd command.
373 * \param arg pointer to a struct drm_map structure.
374 * \return zero on success or a negative value on error.
375 *
376 * Searches the map on drm_device::maplist, removes it from the list, see if
377 * its being used, and free any associate resource (such as MTRR's) if it's not
378 * being on use.
379 *
380 * \sa drm_addmap
381 */
382 int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
383 {
384 struct drm_map_list *r_list = NULL, *list_t;
385 drm_dma_handle_t dmah;
386 int found = 0;
387 struct drm_master *master;
388
389 /* Find the list entry for the map and remove it */
390 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
391 if (r_list->map == map) {
392 master = r_list->master;
393 list_del(&r_list->head);
394 drm_ht_remove_key(&dev->map_hash,
395 r_list->user_token >> PAGE_SHIFT);
396 drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
397 found = 1;
398 break;
399 }
400 }
401
402 if (!found)
403 return -EINVAL;
404
405 switch (map->type) {
406 case _DRM_REGISTERS:
407 iounmap(map->handle);
408 /* FALLTHROUGH */
409 case _DRM_FRAME_BUFFER:
410 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
411 int retcode;
412 retcode = mtrr_del(map->mtrr, map->offset, map->size);
413 DRM_DEBUG("mtrr_del=%d\n", retcode);
414 }
415 break;
416 case _DRM_SHM:
417 vfree(map->handle);
418 if (master) {
419 if (dev->sigdata.lock == master->lock.hw_lock)
420 dev->sigdata.lock = NULL;
421 master->lock.hw_lock = NULL; /* SHM removed */
422 master->lock.file_priv = NULL;
423 wake_up_interruptible_all(&master->lock.lock_queue);
424 }
425 break;
426 case _DRM_AGP:
427 case _DRM_SCATTER_GATHER:
428 break;
429 case _DRM_CONSISTENT:
430 dmah.vaddr = map->handle;
431 dmah.busaddr = map->offset;
432 dmah.size = map->size;
433 __drm_pci_free(dev, &dmah);
434 break;
435 case _DRM_GEM:
436 DRM_ERROR("tried to rmmap GEM object\n");
437 break;
438 }
439 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
440
441 return 0;
442 }
443 EXPORT_SYMBOL(drm_rmmap_locked);
444
445 int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
446 {
447 int ret;
448
449 mutex_lock(&dev->struct_mutex);
450 ret = drm_rmmap_locked(dev, map);
451 mutex_unlock(&dev->struct_mutex);
452
453 return ret;
454 }
455 EXPORT_SYMBOL(drm_rmmap);
456
457 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
458 * the last close of the device, and this is necessary for cleanup when things
459 * exit uncleanly. Therefore, having userland manually remove mappings seems
460 * like a pointless exercise since they're going away anyway.
461 *
462 * One use case might be after addmap is allowed for normal users for SHM and
463 * gets used by drivers that the server doesn't need to care about. This seems
464 * unlikely.
465 */
466 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
467 struct drm_file *file_priv)
468 {
469 struct drm_map *request = data;
470 drm_local_map_t *map = NULL;
471 struct drm_map_list *r_list;
472 int ret;
473
474 mutex_lock(&dev->struct_mutex);
475 list_for_each_entry(r_list, &dev->maplist, head) {
476 if (r_list->map &&
477 r_list->user_token == (unsigned long)request->handle &&
478 r_list->map->flags & _DRM_REMOVABLE) {
479 map = r_list->map;
480 break;
481 }
482 }
483
484 /* List has wrapped around to the head pointer, or its empty we didn't
485 * find anything.
486 */
487 if (list_empty(&dev->maplist) || !map) {
488 mutex_unlock(&dev->struct_mutex);
489 return -EINVAL;
490 }
491
492 /* Register and framebuffer maps are permanent */
493 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
494 mutex_unlock(&dev->struct_mutex);
495 return 0;
496 }
497
498 ret = drm_rmmap_locked(dev, map);
499
500 mutex_unlock(&dev->struct_mutex);
501
502 return ret;
503 }
504
505 /**
506 * Cleanup after an error on one of the addbufs() functions.
507 *
508 * \param dev DRM device.
509 * \param entry buffer entry where the error occurred.
510 *
511 * Frees any pages and buffers associated with the given entry.
512 */
513 static void drm_cleanup_buf_error(struct drm_device * dev,
514 struct drm_buf_entry * entry)
515 {
516 int i;
517
518 if (entry->seg_count) {
519 for (i = 0; i < entry->seg_count; i++) {
520 if (entry->seglist[i]) {
521 drm_pci_free(dev, entry->seglist[i]);
522 }
523 }
524 drm_free(entry->seglist,
525 entry->seg_count *
526 sizeof(*entry->seglist), DRM_MEM_SEGS);
527
528 entry->seg_count = 0;
529 }
530
531 if (entry->buf_count) {
532 for (i = 0; i < entry->buf_count; i++) {
533 if (entry->buflist[i].dev_private) {
534 drm_free(entry->buflist[i].dev_private,
535 entry->buflist[i].dev_priv_size,
536 DRM_MEM_BUFS);
537 }
538 }
539 drm_free(entry->buflist,
540 entry->buf_count *
541 sizeof(*entry->buflist), DRM_MEM_BUFS);
542
543 entry->buf_count = 0;
544 }
545 }
546
547 #if __OS_HAS_AGP
548 /**
549 * Add AGP buffers for DMA transfers.
550 *
551 * \param dev struct drm_device to which the buffers are to be added.
552 * \param request pointer to a struct drm_buf_desc describing the request.
553 * \return zero on success or a negative number on failure.
554 *
555 * After some sanity checks creates a drm_buf structure for each buffer and
556 * reallocates the buffer list of the same size order to accommodate the new
557 * buffers.
558 */
559 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
560 {
561 struct drm_device_dma *dma = dev->dma;
562 struct drm_buf_entry *entry;
563 struct drm_agp_mem *agp_entry;
564 struct drm_buf *buf;
565 unsigned long offset;
566 unsigned long agp_offset;
567 int count;
568 int order;
569 int size;
570 int alignment;
571 int page_order;
572 int total;
573 int byte_count;
574 int i, valid;
575 struct drm_buf **temp_buflist;
576
577 if (!dma)
578 return -EINVAL;
579
580 count = request->count;
581 order = drm_order(request->size);
582 size = 1 << order;
583
584 alignment = (request->flags & _DRM_PAGE_ALIGN)
585 ? PAGE_ALIGN(size) : size;
586 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
587 total = PAGE_SIZE << page_order;
588
589 byte_count = 0;
590 agp_offset = dev->agp->base + request->agp_start;
591
592 DRM_DEBUG("count: %d\n", count);
593 DRM_DEBUG("order: %d\n", order);
594 DRM_DEBUG("size: %d\n", size);
595 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
596 DRM_DEBUG("alignment: %d\n", alignment);
597 DRM_DEBUG("page_order: %d\n", page_order);
598 DRM_DEBUG("total: %d\n", total);
599
600 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
601 return -EINVAL;
602 if (dev->queue_count)
603 return -EBUSY; /* Not while in use */
604
605 /* Make sure buffers are located in AGP memory that we own */
606 valid = 0;
607 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
608 if ((agp_offset >= agp_entry->bound) &&
609 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
610 valid = 1;
611 break;
612 }
613 }
614 if (!list_empty(&dev->agp->memory) && !valid) {
615 DRM_DEBUG("zone invalid\n");
616 return -EINVAL;
617 }
618 spin_lock(&dev->count_lock);
619 if (dev->buf_use) {
620 spin_unlock(&dev->count_lock);
621 return -EBUSY;
622 }
623 atomic_inc(&dev->buf_alloc);
624 spin_unlock(&dev->count_lock);
625
626 mutex_lock(&dev->struct_mutex);
627 entry = &dma->bufs[order];
628 if (entry->buf_count) {
629 mutex_unlock(&dev->struct_mutex);
630 atomic_dec(&dev->buf_alloc);
631 return -ENOMEM; /* May only call once for each order */
632 }
633
634 if (count < 0 || count > 4096) {
635 mutex_unlock(&dev->struct_mutex);
636 atomic_dec(&dev->buf_alloc);
637 return -EINVAL;
638 }
639
640 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
641 DRM_MEM_BUFS);
642 if (!entry->buflist) {
643 mutex_unlock(&dev->struct_mutex);
644 atomic_dec(&dev->buf_alloc);
645 return -ENOMEM;
646 }
647 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
648
649 entry->buf_size = size;
650 entry->page_order = page_order;
651
652 offset = 0;
653
654 while (entry->buf_count < count) {
655 buf = &entry->buflist[entry->buf_count];
656 buf->idx = dma->buf_count + entry->buf_count;
657 buf->total = alignment;
658 buf->order = order;
659 buf->used = 0;
660
661 buf->offset = (dma->byte_count + offset);
662 buf->bus_address = agp_offset + offset;
663 buf->address = (void *)(agp_offset + offset);
664 buf->next = NULL;
665 buf->waiting = 0;
666 buf->pending = 0;
667 init_waitqueue_head(&buf->dma_wait);
668 buf->file_priv = NULL;
669
670 buf->dev_priv_size = dev->driver->dev_priv_size;
671 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
672 if (!buf->dev_private) {
673 /* Set count correctly so we free the proper amount. */
674 entry->buf_count = count;
675 drm_cleanup_buf_error(dev, entry);
676 mutex_unlock(&dev->struct_mutex);
677 atomic_dec(&dev->buf_alloc);
678 return -ENOMEM;
679 }
680 memset(buf->dev_private, 0, buf->dev_priv_size);
681
682 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
683
684 offset += alignment;
685 entry->buf_count++;
686 byte_count += PAGE_SIZE << page_order;
687 }
688
689 DRM_DEBUG("byte_count: %d\n", byte_count);
690
691 temp_buflist = drm_realloc(dma->buflist,
692 dma->buf_count * sizeof(*dma->buflist),
693 (dma->buf_count + entry->buf_count)
694 * sizeof(*dma->buflist), DRM_MEM_BUFS);
695 if (!temp_buflist) {
696 /* Free the entry because it isn't valid */
697 drm_cleanup_buf_error(dev, entry);
698 mutex_unlock(&dev->struct_mutex);
699 atomic_dec(&dev->buf_alloc);
700 return -ENOMEM;
701 }
702 dma->buflist = temp_buflist;
703
704 for (i = 0; i < entry->buf_count; i++) {
705 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
706 }
707
708 dma->buf_count += entry->buf_count;
709 dma->seg_count += entry->seg_count;
710 dma->page_count += byte_count >> PAGE_SHIFT;
711 dma->byte_count += byte_count;
712
713 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
714 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
715
716 mutex_unlock(&dev->struct_mutex);
717
718 request->count = entry->buf_count;
719 request->size = size;
720
721 dma->flags = _DRM_DMA_USE_AGP;
722
723 atomic_dec(&dev->buf_alloc);
724 return 0;
725 }
726 EXPORT_SYMBOL(drm_addbufs_agp);
727 #endif /* __OS_HAS_AGP */
728
729 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
730 {
731 struct drm_device_dma *dma = dev->dma;
732 int count;
733 int order;
734 int size;
735 int total;
736 int page_order;
737 struct drm_buf_entry *entry;
738 drm_dma_handle_t *dmah;
739 struct drm_buf *buf;
740 int alignment;
741 unsigned long offset;
742 int i;
743 int byte_count;
744 int page_count;
745 unsigned long *temp_pagelist;
746 struct drm_buf **temp_buflist;
747
748 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
749 return -EINVAL;
750
751 if (!dma)
752 return -EINVAL;
753
754 if (!capable(CAP_SYS_ADMIN))
755 return -EPERM;
756
757 count = request->count;
758 order = drm_order(request->size);
759 size = 1 << order;
760
761 DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
762 request->count, request->size, size, order, dev->queue_count);
763
764 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
765 return -EINVAL;
766 if (dev->queue_count)
767 return -EBUSY; /* Not while in use */
768
769 alignment = (request->flags & _DRM_PAGE_ALIGN)
770 ? PAGE_ALIGN(size) : size;
771 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
772 total = PAGE_SIZE << page_order;
773
774 spin_lock(&dev->count_lock);
775 if (dev->buf_use) {
776 spin_unlock(&dev->count_lock);
777 return -EBUSY;
778 }
779 atomic_inc(&dev->buf_alloc);
780 spin_unlock(&dev->count_lock);
781
782 mutex_lock(&dev->struct_mutex);
783 entry = &dma->bufs[order];
784 if (entry->buf_count) {
785 mutex_unlock(&dev->struct_mutex);
786 atomic_dec(&dev->buf_alloc);
787 return -ENOMEM; /* May only call once for each order */
788 }
789
790 if (count < 0 || count > 4096) {
791 mutex_unlock(&dev->struct_mutex);
792 atomic_dec(&dev->buf_alloc);
793 return -EINVAL;
794 }
795
796 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
797 DRM_MEM_BUFS);
798 if (!entry->buflist) {
799 mutex_unlock(&dev->struct_mutex);
800 atomic_dec(&dev->buf_alloc);
801 return -ENOMEM;
802 }
803 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
804
805 entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
806 DRM_MEM_SEGS);
807 if (!entry->seglist) {
808 drm_free(entry->buflist,
809 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
810 mutex_unlock(&dev->struct_mutex);
811 atomic_dec(&dev->buf_alloc);
812 return -ENOMEM;
813 }
814 memset(entry->seglist, 0, count * sizeof(*entry->seglist));
815
816 /* Keep the original pagelist until we know all the allocations
817 * have succeeded
818 */
819 temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
820 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
821 if (!temp_pagelist) {
822 drm_free(entry->buflist,
823 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
824 drm_free(entry->seglist,
825 count * sizeof(*entry->seglist), DRM_MEM_SEGS);
826 mutex_unlock(&dev->struct_mutex);
827 atomic_dec(&dev->buf_alloc);
828 return -ENOMEM;
829 }
830 memcpy(temp_pagelist,
831 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
832 DRM_DEBUG("pagelist: %d entries\n",
833 dma->page_count + (count << page_order));
834
835 entry->buf_size = size;
836 entry->page_order = page_order;
837 byte_count = 0;
838 page_count = 0;
839
840 while (entry->buf_count < count) {
841
842 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
843
844 if (!dmah) {
845 /* Set count correctly so we free the proper amount. */
846 entry->buf_count = count;
847 entry->seg_count = count;
848 drm_cleanup_buf_error(dev, entry);
849 drm_free(temp_pagelist,
850 (dma->page_count + (count << page_order))
851 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
852 mutex_unlock(&dev->struct_mutex);
853 atomic_dec(&dev->buf_alloc);
854 return -ENOMEM;
855 }
856 entry->seglist[entry->seg_count++] = dmah;
857 for (i = 0; i < (1 << page_order); i++) {
858 DRM_DEBUG("page %d @ 0x%08lx\n",
859 dma->page_count + page_count,
860 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
861 temp_pagelist[dma->page_count + page_count++]
862 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
863 }
864 for (offset = 0;
865 offset + size <= total && entry->buf_count < count;
866 offset += alignment, ++entry->buf_count) {
867 buf = &entry->buflist[entry->buf_count];
868 buf->idx = dma->buf_count + entry->buf_count;
869 buf->total = alignment;
870 buf->order = order;
871 buf->used = 0;
872 buf->offset = (dma->byte_count + byte_count + offset);
873 buf->address = (void *)(dmah->vaddr + offset);
874 buf->bus_address = dmah->busaddr + offset;
875 buf->next = NULL;
876 buf->waiting = 0;
877 buf->pending = 0;
878 init_waitqueue_head(&buf->dma_wait);
879 buf->file_priv = NULL;
880
881 buf->dev_priv_size = dev->driver->dev_priv_size;
882 buf->dev_private = drm_alloc(buf->dev_priv_size,
883 DRM_MEM_BUFS);
884 if (!buf->dev_private) {
885 /* Set count correctly so we free the proper amount. */
886 entry->buf_count = count;
887 entry->seg_count = count;
888 drm_cleanup_buf_error(dev, entry);
889 drm_free(temp_pagelist,
890 (dma->page_count +
891 (count << page_order))
892 * sizeof(*dma->pagelist),
893 DRM_MEM_PAGES);
894 mutex_unlock(&dev->struct_mutex);
895 atomic_dec(&dev->buf_alloc);
896 return -ENOMEM;
897 }
898 memset(buf->dev_private, 0, buf->dev_priv_size);
899
900 DRM_DEBUG("buffer %d @ %p\n",
901 entry->buf_count, buf->address);
902 }
903 byte_count += PAGE_SIZE << page_order;
904 }
905
906 temp_buflist = drm_realloc(dma->buflist,
907 dma->buf_count * sizeof(*dma->buflist),
908 (dma->buf_count + entry->buf_count)
909 * sizeof(*dma->buflist), DRM_MEM_BUFS);
910 if (!temp_buflist) {
911 /* Free the entry because it isn't valid */
912 drm_cleanup_buf_error(dev, entry);
913 drm_free(temp_pagelist,
914 (dma->page_count + (count << page_order))
915 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
916 mutex_unlock(&dev->struct_mutex);
917 atomic_dec(&dev->buf_alloc);
918 return -ENOMEM;
919 }
920 dma->buflist = temp_buflist;
921
922 for (i = 0; i < entry->buf_count; i++) {
923 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
924 }
925
926 /* No allocations failed, so now we can replace the orginal pagelist
927 * with the new one.
928 */
929 if (dma->page_count) {
930 drm_free(dma->pagelist,
931 dma->page_count * sizeof(*dma->pagelist),
932 DRM_MEM_PAGES);
933 }
934 dma->pagelist = temp_pagelist;
935
936 dma->buf_count += entry->buf_count;
937 dma->seg_count += entry->seg_count;
938 dma->page_count += entry->seg_count << page_order;
939 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
940
941 mutex_unlock(&dev->struct_mutex);
942
943 request->count = entry->buf_count;
944 request->size = size;
945
946 if (request->flags & _DRM_PCI_BUFFER_RO)
947 dma->flags = _DRM_DMA_USE_PCI_RO;
948
949 atomic_dec(&dev->buf_alloc);
950 return 0;
951
952 }
953 EXPORT_SYMBOL(drm_addbufs_pci);
954
955 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
956 {
957 struct drm_device_dma *dma = dev->dma;
958 struct drm_buf_entry *entry;
959 struct drm_buf *buf;
960 unsigned long offset;
961 unsigned long agp_offset;
962 int count;
963 int order;
964 int size;
965 int alignment;
966 int page_order;
967 int total;
968 int byte_count;
969 int i;
970 struct drm_buf **temp_buflist;
971
972 if (!drm_core_check_feature(dev, DRIVER_SG))
973 return -EINVAL;
974
975 if (!dma)
976 return -EINVAL;
977
978 if (!capable(CAP_SYS_ADMIN))
979 return -EPERM;
980
981 count = request->count;
982 order = drm_order(request->size);
983 size = 1 << order;
984
985 alignment = (request->flags & _DRM_PAGE_ALIGN)
986 ? PAGE_ALIGN(size) : size;
987 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
988 total = PAGE_SIZE << page_order;
989
990 byte_count = 0;
991 agp_offset = request->agp_start;
992
993 DRM_DEBUG("count: %d\n", count);
994 DRM_DEBUG("order: %d\n", order);
995 DRM_DEBUG("size: %d\n", size);
996 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
997 DRM_DEBUG("alignment: %d\n", alignment);
998 DRM_DEBUG("page_order: %d\n", page_order);
999 DRM_DEBUG("total: %d\n", total);
1000
1001 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1002 return -EINVAL;
1003 if (dev->queue_count)
1004 return -EBUSY; /* Not while in use */
1005
1006 spin_lock(&dev->count_lock);
1007 if (dev->buf_use) {
1008 spin_unlock(&dev->count_lock);
1009 return -EBUSY;
1010 }
1011 atomic_inc(&dev->buf_alloc);
1012 spin_unlock(&dev->count_lock);
1013
1014 mutex_lock(&dev->struct_mutex);
1015 entry = &dma->bufs[order];
1016 if (entry->buf_count) {
1017 mutex_unlock(&dev->struct_mutex);
1018 atomic_dec(&dev->buf_alloc);
1019 return -ENOMEM; /* May only call once for each order */
1020 }
1021
1022 if (count < 0 || count > 4096) {
1023 mutex_unlock(&dev->struct_mutex);
1024 atomic_dec(&dev->buf_alloc);
1025 return -EINVAL;
1026 }
1027
1028 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1029 DRM_MEM_BUFS);
1030 if (!entry->buflist) {
1031 mutex_unlock(&dev->struct_mutex);
1032 atomic_dec(&dev->buf_alloc);
1033 return -ENOMEM;
1034 }
1035 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1036
1037 entry->buf_size = size;
1038 entry->page_order = page_order;
1039
1040 offset = 0;
1041
1042 while (entry->buf_count < count) {
1043 buf = &entry->buflist[entry->buf_count];
1044 buf->idx = dma->buf_count + entry->buf_count;
1045 buf->total = alignment;
1046 buf->order = order;
1047 buf->used = 0;
1048
1049 buf->offset = (dma->byte_count + offset);
1050 buf->bus_address = agp_offset + offset;
1051 buf->address = (void *)(agp_offset + offset
1052 + (unsigned long)dev->sg->virtual);
1053 buf->next = NULL;
1054 buf->waiting = 0;
1055 buf->pending = 0;
1056 init_waitqueue_head(&buf->dma_wait);
1057 buf->file_priv = NULL;
1058
1059 buf->dev_priv_size = dev->driver->dev_priv_size;
1060 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1061 if (!buf->dev_private) {
1062 /* Set count correctly so we free the proper amount. */
1063 entry->buf_count = count;
1064 drm_cleanup_buf_error(dev, entry);
1065 mutex_unlock(&dev->struct_mutex);
1066 atomic_dec(&dev->buf_alloc);
1067 return -ENOMEM;
1068 }
1069
1070 memset(buf->dev_private, 0, buf->dev_priv_size);
1071
1072 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1073
1074 offset += alignment;
1075 entry->buf_count++;
1076 byte_count += PAGE_SIZE << page_order;
1077 }
1078
1079 DRM_DEBUG("byte_count: %d\n", byte_count);
1080
1081 temp_buflist = drm_realloc(dma->buflist,
1082 dma->buf_count * sizeof(*dma->buflist),
1083 (dma->buf_count + entry->buf_count)
1084 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1085 if (!temp_buflist) {
1086 /* Free the entry because it isn't valid */
1087 drm_cleanup_buf_error(dev, entry);
1088 mutex_unlock(&dev->struct_mutex);
1089 atomic_dec(&dev->buf_alloc);
1090 return -ENOMEM;
1091 }
1092 dma->buflist = temp_buflist;
1093
1094 for (i = 0; i < entry->buf_count; i++) {
1095 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1096 }
1097
1098 dma->buf_count += entry->buf_count;
1099 dma->seg_count += entry->seg_count;
1100 dma->page_count += byte_count >> PAGE_SHIFT;
1101 dma->byte_count += byte_count;
1102
1103 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1104 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1105
1106 mutex_unlock(&dev->struct_mutex);
1107
1108 request->count = entry->buf_count;
1109 request->size = size;
1110
1111 dma->flags = _DRM_DMA_USE_SG;
1112
1113 atomic_dec(&dev->buf_alloc);
1114 return 0;
1115 }
1116
1117 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1118 {
1119 struct drm_device_dma *dma = dev->dma;
1120 struct drm_buf_entry *entry;
1121 struct drm_buf *buf;
1122 unsigned long offset;
1123 unsigned long agp_offset;
1124 int count;
1125 int order;
1126 int size;
1127 int alignment;
1128 int page_order;
1129 int total;
1130 int byte_count;
1131 int i;
1132 struct drm_buf **temp_buflist;
1133
1134 if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1135 return -EINVAL;
1136
1137 if (!dma)
1138 return -EINVAL;
1139
1140 if (!capable(CAP_SYS_ADMIN))
1141 return -EPERM;
1142
1143 count = request->count;
1144 order = drm_order(request->size);
1145 size = 1 << order;
1146
1147 alignment = (request->flags & _DRM_PAGE_ALIGN)
1148 ? PAGE_ALIGN(size) : size;
1149 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1150 total = PAGE_SIZE << page_order;
1151
1152 byte_count = 0;
1153 agp_offset = request->agp_start;
1154
1155 DRM_DEBUG("count: %d\n", count);
1156 DRM_DEBUG("order: %d\n", order);
1157 DRM_DEBUG("size: %d\n", size);
1158 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1159 DRM_DEBUG("alignment: %d\n", alignment);
1160 DRM_DEBUG("page_order: %d\n", page_order);
1161 DRM_DEBUG("total: %d\n", total);
1162
1163 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1164 return -EINVAL;
1165 if (dev->queue_count)
1166 return -EBUSY; /* Not while in use */
1167
1168 spin_lock(&dev->count_lock);
1169 if (dev->buf_use) {
1170 spin_unlock(&dev->count_lock);
1171 return -EBUSY;
1172 }
1173 atomic_inc(&dev->buf_alloc);
1174 spin_unlock(&dev->count_lock);
1175
1176 mutex_lock(&dev->struct_mutex);
1177 entry = &dma->bufs[order];
1178 if (entry->buf_count) {
1179 mutex_unlock(&dev->struct_mutex);
1180 atomic_dec(&dev->buf_alloc);
1181 return -ENOMEM; /* May only call once for each order */
1182 }
1183
1184 if (count < 0 || count > 4096) {
1185 mutex_unlock(&dev->struct_mutex);
1186 atomic_dec(&dev->buf_alloc);
1187 return -EINVAL;
1188 }
1189
1190 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1191 DRM_MEM_BUFS);
1192 if (!entry->buflist) {
1193 mutex_unlock(&dev->struct_mutex);
1194 atomic_dec(&dev->buf_alloc);
1195 return -ENOMEM;
1196 }
1197 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1198
1199 entry->buf_size = size;
1200 entry->page_order = page_order;
1201
1202 offset = 0;
1203
1204 while (entry->buf_count < count) {
1205 buf = &entry->buflist[entry->buf_count];
1206 buf->idx = dma->buf_count + entry->buf_count;
1207 buf->total = alignment;
1208 buf->order = order;
1209 buf->used = 0;
1210
1211 buf->offset = (dma->byte_count + offset);
1212 buf->bus_address = agp_offset + offset;
1213 buf->address = (void *)(agp_offset + offset);
1214 buf->next = NULL;
1215 buf->waiting = 0;
1216 buf->pending = 0;
1217 init_waitqueue_head(&buf->dma_wait);
1218 buf->file_priv = NULL;
1219
1220 buf->dev_priv_size = dev->driver->dev_priv_size;
1221 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1222 if (!buf->dev_private) {
1223 /* Set count correctly so we free the proper amount. */
1224 entry->buf_count = count;
1225 drm_cleanup_buf_error(dev, entry);
1226 mutex_unlock(&dev->struct_mutex);
1227 atomic_dec(&dev->buf_alloc);
1228 return -ENOMEM;
1229 }
1230 memset(buf->dev_private, 0, buf->dev_priv_size);
1231
1232 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1233
1234 offset += alignment;
1235 entry->buf_count++;
1236 byte_count += PAGE_SIZE << page_order;
1237 }
1238
1239 DRM_DEBUG("byte_count: %d\n", byte_count);
1240
1241 temp_buflist = drm_realloc(dma->buflist,
1242 dma->buf_count * sizeof(*dma->buflist),
1243 (dma->buf_count + entry->buf_count)
1244 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1245 if (!temp_buflist) {
1246 /* Free the entry because it isn't valid */
1247 drm_cleanup_buf_error(dev, entry);
1248 mutex_unlock(&dev->struct_mutex);
1249 atomic_dec(&dev->buf_alloc);
1250 return -ENOMEM;
1251 }
1252 dma->buflist = temp_buflist;
1253
1254 for (i = 0; i < entry->buf_count; i++) {
1255 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1256 }
1257
1258 dma->buf_count += entry->buf_count;
1259 dma->seg_count += entry->seg_count;
1260 dma->page_count += byte_count >> PAGE_SHIFT;
1261 dma->byte_count += byte_count;
1262
1263 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1264 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1265
1266 mutex_unlock(&dev->struct_mutex);
1267
1268 request->count = entry->buf_count;
1269 request->size = size;
1270
1271 dma->flags = _DRM_DMA_USE_FB;
1272
1273 atomic_dec(&dev->buf_alloc);
1274 return 0;
1275 }
1276
1277
1278 /**
1279 * Add buffers for DMA transfers (ioctl).
1280 *
1281 * \param inode device inode.
1282 * \param file_priv DRM file private.
1283 * \param cmd command.
1284 * \param arg pointer to a struct drm_buf_desc request.
1285 * \return zero on success or a negative number on failure.
1286 *
1287 * According with the memory type specified in drm_buf_desc::flags and the
1288 * build options, it dispatches the call either to addbufs_agp(),
1289 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1290 * PCI memory respectively.
1291 */
1292 int drm_addbufs(struct drm_device *dev, void *data,
1293 struct drm_file *file_priv)
1294 {
1295 struct drm_buf_desc *request = data;
1296 int ret;
1297
1298 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1299 return -EINVAL;
1300
1301 #if __OS_HAS_AGP
1302 if (request->flags & _DRM_AGP_BUFFER)
1303 ret = drm_addbufs_agp(dev, request);
1304 else
1305 #endif
1306 if (request->flags & _DRM_SG_BUFFER)
1307 ret = drm_addbufs_sg(dev, request);
1308 else if (request->flags & _DRM_FB_BUFFER)
1309 ret = drm_addbufs_fb(dev, request);
1310 else
1311 ret = drm_addbufs_pci(dev, request);
1312
1313 return ret;
1314 }
1315
1316 /**
1317 * Get information about the buffer mappings.
1318 *
1319 * This was originally mean for debugging purposes, or by a sophisticated
1320 * client library to determine how best to use the available buffers (e.g.,
1321 * large buffers can be used for image transfer).
1322 *
1323 * \param inode device inode.
1324 * \param file_priv DRM file private.
1325 * \param cmd command.
1326 * \param arg pointer to a drm_buf_info structure.
1327 * \return zero on success or a negative number on failure.
1328 *
1329 * Increments drm_device::buf_use while holding the drm_device::count_lock
1330 * lock, preventing of allocating more buffers after this call. Information
1331 * about each requested buffer is then copied into user space.
1332 */
1333 int drm_infobufs(struct drm_device *dev, void *data,
1334 struct drm_file *file_priv)
1335 {
1336 struct drm_device_dma *dma = dev->dma;
1337 struct drm_buf_info *request = data;
1338 int i;
1339 int count;
1340
1341 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1342 return -EINVAL;
1343
1344 if (!dma)
1345 return -EINVAL;
1346
1347 spin_lock(&dev->count_lock);
1348 if (atomic_read(&dev->buf_alloc)) {
1349 spin_unlock(&dev->count_lock);
1350 return -EBUSY;
1351 }
1352 ++dev->buf_use; /* Can't allocate more after this call */
1353 spin_unlock(&dev->count_lock);
1354
1355 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1356 if (dma->bufs[i].buf_count)
1357 ++count;
1358 }
1359
1360 DRM_DEBUG("count = %d\n", count);
1361
1362 if (request->count >= count) {
1363 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1364 if (dma->bufs[i].buf_count) {
1365 struct drm_buf_desc __user *to =
1366 &request->list[count];
1367 struct drm_buf_entry *from = &dma->bufs[i];
1368 struct drm_freelist *list = &dma->bufs[i].freelist;
1369 if (copy_to_user(&to->count,
1370 &from->buf_count,
1371 sizeof(from->buf_count)) ||
1372 copy_to_user(&to->size,
1373 &from->buf_size,
1374 sizeof(from->buf_size)) ||
1375 copy_to_user(&to->low_mark,
1376 &list->low_mark,
1377 sizeof(list->low_mark)) ||
1378 copy_to_user(&to->high_mark,
1379 &list->high_mark,
1380 sizeof(list->high_mark)))
1381 return -EFAULT;
1382
1383 DRM_DEBUG("%d %d %d %d %d\n",
1384 i,
1385 dma->bufs[i].buf_count,
1386 dma->bufs[i].buf_size,
1387 dma->bufs[i].freelist.low_mark,
1388 dma->bufs[i].freelist.high_mark);
1389 ++count;
1390 }
1391 }
1392 }
1393 request->count = count;
1394
1395 return 0;
1396 }
1397
1398 /**
1399 * Specifies a low and high water mark for buffer allocation
1400 *
1401 * \param inode device inode.
1402 * \param file_priv DRM file private.
1403 * \param cmd command.
1404 * \param arg a pointer to a drm_buf_desc structure.
1405 * \return zero on success or a negative number on failure.
1406 *
1407 * Verifies that the size order is bounded between the admissible orders and
1408 * updates the respective drm_device_dma::bufs entry low and high water mark.
1409 *
1410 * \note This ioctl is deprecated and mostly never used.
1411 */
1412 int drm_markbufs(struct drm_device *dev, void *data,
1413 struct drm_file *file_priv)
1414 {
1415 struct drm_device_dma *dma = dev->dma;
1416 struct drm_buf_desc *request = data;
1417 int order;
1418 struct drm_buf_entry *entry;
1419
1420 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1421 return -EINVAL;
1422
1423 if (!dma)
1424 return -EINVAL;
1425
1426 DRM_DEBUG("%d, %d, %d\n",
1427 request->size, request->low_mark, request->high_mark);
1428 order = drm_order(request->size);
1429 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1430 return -EINVAL;
1431 entry = &dma->bufs[order];
1432
1433 if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1434 return -EINVAL;
1435 if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1436 return -EINVAL;
1437
1438 entry->freelist.low_mark = request->low_mark;
1439 entry->freelist.high_mark = request->high_mark;
1440
1441 return 0;
1442 }
1443
1444 /**
1445 * Unreserve the buffers in list, previously reserved using drmDMA.
1446 *
1447 * \param inode device inode.
1448 * \param file_priv DRM file private.
1449 * \param cmd command.
1450 * \param arg pointer to a drm_buf_free structure.
1451 * \return zero on success or a negative number on failure.
1452 *
1453 * Calls free_buffer() for each used buffer.
1454 * This function is primarily used for debugging.
1455 */
1456 int drm_freebufs(struct drm_device *dev, void *data,
1457 struct drm_file *file_priv)
1458 {
1459 struct drm_device_dma *dma = dev->dma;
1460 struct drm_buf_free *request = data;
1461 int i;
1462 int idx;
1463 struct drm_buf *buf;
1464
1465 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1466 return -EINVAL;
1467
1468 if (!dma)
1469 return -EINVAL;
1470
1471 DRM_DEBUG("%d\n", request->count);
1472 for (i = 0; i < request->count; i++) {
1473 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1474 return -EFAULT;
1475 if (idx < 0 || idx >= dma->buf_count) {
1476 DRM_ERROR("Index %d (of %d max)\n",
1477 idx, dma->buf_count - 1);
1478 return -EINVAL;
1479 }
1480 buf = dma->buflist[idx];
1481 if (buf->file_priv != file_priv) {
1482 DRM_ERROR("Process %d freeing buffer not owned\n",
1483 task_pid_nr(current));
1484 return -EINVAL;
1485 }
1486 drm_free_buffer(dev, buf);
1487 }
1488
1489 return 0;
1490 }
1491
1492 /**
1493 * Maps all of the DMA buffers into client-virtual space (ioctl).
1494 *
1495 * \param inode device inode.
1496 * \param file_priv DRM file private.
1497 * \param cmd command.
1498 * \param arg pointer to a drm_buf_map structure.
1499 * \return zero on success or a negative number on failure.
1500 *
1501 * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1502 * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1503 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1504 * drm_mmap_dma().
1505 */
1506 int drm_mapbufs(struct drm_device *dev, void *data,
1507 struct drm_file *file_priv)
1508 {
1509 struct drm_device_dma *dma = dev->dma;
1510 int retcode = 0;
1511 const int zero = 0;
1512 unsigned long virtual;
1513 unsigned long address;
1514 struct drm_buf_map *request = data;
1515 int i;
1516
1517 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1518 return -EINVAL;
1519
1520 if (!dma)
1521 return -EINVAL;
1522
1523 spin_lock(&dev->count_lock);
1524 if (atomic_read(&dev->buf_alloc)) {
1525 spin_unlock(&dev->count_lock);
1526 return -EBUSY;
1527 }
1528 dev->buf_use++; /* Can't allocate more after this call */
1529 spin_unlock(&dev->count_lock);
1530
1531 if (request->count >= dma->buf_count) {
1532 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1533 || (drm_core_check_feature(dev, DRIVER_SG)
1534 && (dma->flags & _DRM_DMA_USE_SG))
1535 || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1536 && (dma->flags & _DRM_DMA_USE_FB))) {
1537 struct drm_map *map = dev->agp_buffer_map;
1538 unsigned long token = dev->agp_buffer_token;
1539
1540 if (!map) {
1541 retcode = -EINVAL;
1542 goto done;
1543 }
1544 down_write(&current->mm->mmap_sem);
1545 virtual = do_mmap(file_priv->filp, 0, map->size,
1546 PROT_READ | PROT_WRITE,
1547 MAP_SHARED,
1548 token);
1549 up_write(&current->mm->mmap_sem);
1550 } else {
1551 down_write(&current->mm->mmap_sem);
1552 virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1553 PROT_READ | PROT_WRITE,
1554 MAP_SHARED, 0);
1555 up_write(&current->mm->mmap_sem);
1556 }
1557 if (virtual > -1024UL) {
1558 /* Real error */
1559 retcode = (signed long)virtual;
1560 goto done;
1561 }
1562 request->virtual = (void __user *)virtual;
1563
1564 for (i = 0; i < dma->buf_count; i++) {
1565 if (copy_to_user(&request->list[i].idx,
1566 &dma->buflist[i]->idx,
1567 sizeof(request->list[0].idx))) {
1568 retcode = -EFAULT;
1569 goto done;
1570 }
1571 if (copy_to_user(&request->list[i].total,
1572 &dma->buflist[i]->total,
1573 sizeof(request->list[0].total))) {
1574 retcode = -EFAULT;
1575 goto done;
1576 }
1577 if (copy_to_user(&request->list[i].used,
1578 &zero, sizeof(zero))) {
1579 retcode = -EFAULT;
1580 goto done;
1581 }
1582 address = virtual + dma->buflist[i]->offset; /* *** */
1583 if (copy_to_user(&request->list[i].address,
1584 &address, sizeof(address))) {
1585 retcode = -EFAULT;
1586 goto done;
1587 }
1588 }
1589 }
1590 done:
1591 request->count = dma->buf_count;
1592 DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1593
1594 return retcode;
1595 }
1596
1597 /**
1598 * Compute size order. Returns the exponent of the smaller power of two which
1599 * is greater or equal to given number.
1600 *
1601 * \param size size.
1602 * \return order.
1603 *
1604 * \todo Can be made faster.
1605 */
1606 int drm_order(unsigned long size)
1607 {
1608 int order;
1609 unsigned long tmp;
1610
1611 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1612
1613 if (size & (size - 1))
1614 ++order;
1615
1616 return order;
1617 }
1618 EXPORT_SYMBOL(drm_order);
Linux kernel - Deliverables
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