?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
drm: move to kref per-master structures.
[linux-2.6/linux-loongson.git] / drivers / gpu / drm / drm_bufs.c
blobdc3ce3e0a0a4cd5c9a618b122792e01d6206a07f
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 }
266 case _DRM_SCATTER_GATHER:
267 if (!dev->sg) {
268 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
269 return -EINVAL;
270 }
271 map->offset += (unsigned long)dev->sg->virtual;
272 break;
273 case _DRM_CONSISTENT:
274 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
275 * As we're limiting the address to 2^32-1 (or less),
276 * casting it down to 32 bits is no problem, but we
277 * need to point to a 64bit variable first. */
278 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
279 if (!dmah) {
280 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
281 return -ENOMEM;
282 }
283 map->handle = dmah->vaddr;
284 map->offset = (unsigned long)dmah->busaddr;
285 kfree(dmah);
286 break;
287 default:
288 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
289 return -EINVAL;
290 }
291
292 list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
293 if (!list) {
294 if (map->type == _DRM_REGISTERS)
295 iounmap(map->handle);
296 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
297 return -EINVAL;
298 }
299 memset(list, 0, sizeof(*list));
300 list->map = map;
301
302 mutex_lock(&dev->struct_mutex);
303 list_add(&list->head, &dev->maplist);
304
305 /* Assign a 32-bit handle */
306 /* We do it here so that dev->struct_mutex protects the increment */
307 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
308 map->offset;
309 ret = drm_map_handle(dev, &list->hash, user_token, 0);
310 if (ret) {
311 if (map->type == _DRM_REGISTERS)
312 iounmap(map->handle);
313 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
314 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
315 mutex_unlock(&dev->struct_mutex);
316 return ret;
317 }
318
319 list->user_token = list->hash.key << PAGE_SHIFT;
320 mutex_unlock(&dev->struct_mutex);
321
322 list->master = dev->primary->master;
323 *maplist = list;
324 return 0;
325 }
326
327 int drm_addmap(struct drm_device * dev, unsigned int offset,
328 unsigned int size, enum drm_map_type type,
329 enum drm_map_flags flags, drm_local_map_t ** map_ptr)
330 {
331 struct drm_map_list *list;
332 int rc;
333
334 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
335 if (!rc)
336 *map_ptr = list->map;
337 return rc;
338 }
339
340 EXPORT_SYMBOL(drm_addmap);
341
342 int drm_addmap_ioctl(struct drm_device *dev, void *data,
343 struct drm_file *file_priv)
344 {
345 struct drm_map *map = data;
346 struct drm_map_list *maplist;
347 int err;
348
349 if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
350 return -EPERM;
351
352 err = drm_addmap_core(dev, map->offset, map->size, map->type,
353 map->flags, &maplist);
354
355 if (err)
356 return err;
357
358 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
359 map->handle = (void *)(unsigned long)maplist->user_token;
360 return 0;
361 }
362
363 /**
364 * Remove a map private from list and deallocate resources if the mapping
365 * isn't in use.
366 *
367 * \param inode device inode.
368 * \param file_priv DRM file private.
369 * \param cmd command.
370 * \param arg pointer to a struct drm_map structure.
371 * \return zero on success or a negative value on error.
372 *
373 * Searches the map on drm_device::maplist, removes it from the list, see if
374 * its being used, and free any associate resource (such as MTRR's) if it's not
375 * being on use.
376 *
377 * \sa drm_addmap
378 */
379 int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
380 {
381 struct drm_map_list *r_list = NULL, *list_t;
382 drm_dma_handle_t dmah;
383 int found = 0;
384 struct drm_master *master;
385
386 /* Find the list entry for the map and remove it */
387 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
388 if (r_list->map == map) {
389 master = r_list->master;
390 list_del(&r_list->head);
391 drm_ht_remove_key(&dev->map_hash,
392 r_list->user_token >> PAGE_SHIFT);
393 drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
394 found = 1;
395 break;
396 }
397 }
398
399 if (!found)
400 return -EINVAL;
401
402 switch (map->type) {
403 case _DRM_REGISTERS:
404 iounmap(map->handle);
405 /* FALLTHROUGH */
406 case _DRM_FRAME_BUFFER:
407 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
408 int retcode;
409 retcode = mtrr_del(map->mtrr, map->offset, map->size);
410 DRM_DEBUG("mtrr_del=%d\n", retcode);
411 }
412 break;
413 case _DRM_SHM:
414 vfree(map->handle);
415 if (master) {
416 if (dev->sigdata.lock == master->lock.hw_lock)
417 dev->sigdata.lock = NULL;
418 master->lock.hw_lock = NULL; /* SHM removed */
419 master->lock.file_priv = NULL;
420 wake_up_interruptible(&master->lock.lock_queue);
421 }
422 break;
423 case _DRM_AGP:
424 case _DRM_SCATTER_GATHER:
425 break;
426 case _DRM_CONSISTENT:
427 dmah.vaddr = map->handle;
428 dmah.busaddr = map->offset;
429 dmah.size = map->size;
430 __drm_pci_free(dev, &dmah);
431 break;
432 }
433 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
434
435 return 0;
436 }
437
438 int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
439 {
440 int ret;
441
442 mutex_lock(&dev->struct_mutex);
443 ret = drm_rmmap_locked(dev, map);
444 mutex_unlock(&dev->struct_mutex);
445
446 return ret;
447 }
448 EXPORT_SYMBOL(drm_rmmap);
449
450 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
451 * the last close of the device, and this is necessary for cleanup when things
452 * exit uncleanly. Therefore, having userland manually remove mappings seems
453 * like a pointless exercise since they're going away anyway.
454 *
455 * One use case might be after addmap is allowed for normal users for SHM and
456 * gets used by drivers that the server doesn't need to care about. This seems
457 * unlikely.
458 */
459 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
460 struct drm_file *file_priv)
461 {
462 struct drm_map *request = data;
463 drm_local_map_t *map = NULL;
464 struct drm_map_list *r_list;
465 int ret;
466
467 mutex_lock(&dev->struct_mutex);
468 list_for_each_entry(r_list, &dev->maplist, head) {
469 if (r_list->map &&
470 r_list->user_token == (unsigned long)request->handle &&
471 r_list->map->flags & _DRM_REMOVABLE) {
472 map = r_list->map;
473 break;
474 }
475 }
476
477 /* List has wrapped around to the head pointer, or its empty we didn't
478 * find anything.
479 */
480 if (list_empty(&dev->maplist) || !map) {
481 mutex_unlock(&dev->struct_mutex);
482 return -EINVAL;
483 }
484
485 /* Register and framebuffer maps are permanent */
486 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
487 mutex_unlock(&dev->struct_mutex);
488 return 0;
489 }
490
491 ret = drm_rmmap_locked(dev, map);
492
493 mutex_unlock(&dev->struct_mutex);
494
495 return ret;
496 }
497
498 /**
499 * Cleanup after an error on one of the addbufs() functions.
500 *
501 * \param dev DRM device.
502 * \param entry buffer entry where the error occurred.
503 *
504 * Frees any pages and buffers associated with the given entry.
505 */
506 static void drm_cleanup_buf_error(struct drm_device * dev,
507 struct drm_buf_entry * entry)
508 {
509 int i;
510
511 if (entry->seg_count) {
512 for (i = 0; i < entry->seg_count; i++) {
513 if (entry->seglist[i]) {
514 drm_pci_free(dev, entry->seglist[i]);
515 }
516 }
517 drm_free(entry->seglist,
518 entry->seg_count *
519 sizeof(*entry->seglist), DRM_MEM_SEGS);
520
521 entry->seg_count = 0;
522 }
523
524 if (entry->buf_count) {
525 for (i = 0; i < entry->buf_count; i++) {
526 if (entry->buflist[i].dev_private) {
527 drm_free(entry->buflist[i].dev_private,
528 entry->buflist[i].dev_priv_size,
529 DRM_MEM_BUFS);
530 }
531 }
532 drm_free(entry->buflist,
533 entry->buf_count *
534 sizeof(*entry->buflist), DRM_MEM_BUFS);
535
536 entry->buf_count = 0;
537 }
538 }
539
540 #if __OS_HAS_AGP
541 /**
542 * Add AGP buffers for DMA transfers.
543 *
544 * \param dev struct drm_device to which the buffers are to be added.
545 * \param request pointer to a struct drm_buf_desc describing the request.
546 * \return zero on success or a negative number on failure.
547 *
548 * After some sanity checks creates a drm_buf structure for each buffer and
549 * reallocates the buffer list of the same size order to accommodate the new
550 * buffers.
551 */
552 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
553 {
554 struct drm_device_dma *dma = dev->dma;
555 struct drm_buf_entry *entry;
556 struct drm_agp_mem *agp_entry;
557 struct drm_buf *buf;
558 unsigned long offset;
559 unsigned long agp_offset;
560 int count;
561 int order;
562 int size;
563 int alignment;
564 int page_order;
565 int total;
566 int byte_count;
567 int i, valid;
568 struct drm_buf **temp_buflist;
569
570 if (!dma)
571 return -EINVAL;
572
573 count = request->count;
574 order = drm_order(request->size);
575 size = 1 << order;
576
577 alignment = (request->flags & _DRM_PAGE_ALIGN)
578 ? PAGE_ALIGN(size) : size;
579 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
580 total = PAGE_SIZE << page_order;
581
582 byte_count = 0;
583 agp_offset = dev->agp->base + request->agp_start;
584
585 DRM_DEBUG("count: %d\n", count);
586 DRM_DEBUG("order: %d\n", order);
587 DRM_DEBUG("size: %d\n", size);
588 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
589 DRM_DEBUG("alignment: %d\n", alignment);
590 DRM_DEBUG("page_order: %d\n", page_order);
591 DRM_DEBUG("total: %d\n", total);
592
593 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
594 return -EINVAL;
595 if (dev->queue_count)
596 return -EBUSY; /* Not while in use */
597
598 /* Make sure buffers are located in AGP memory that we own */
599 valid = 0;
600 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
601 if ((agp_offset >= agp_entry->bound) &&
602 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
603 valid = 1;
604 break;
605 }
606 }
607 if (!list_empty(&dev->agp->memory) && !valid) {
608 DRM_DEBUG("zone invalid\n");
609 return -EINVAL;
610 }
611 spin_lock(&dev->count_lock);
612 if (dev->buf_use) {
613 spin_unlock(&dev->count_lock);
614 return -EBUSY;
615 }
616 atomic_inc(&dev->buf_alloc);
617 spin_unlock(&dev->count_lock);
618
619 mutex_lock(&dev->struct_mutex);
620 entry = &dma->bufs[order];
621 if (entry->buf_count) {
622 mutex_unlock(&dev->struct_mutex);
623 atomic_dec(&dev->buf_alloc);
624 return -ENOMEM; /* May only call once for each order */
625 }
626
627 if (count < 0 || count > 4096) {
628 mutex_unlock(&dev->struct_mutex);
629 atomic_dec(&dev->buf_alloc);
630 return -EINVAL;
631 }
632
633 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
634 DRM_MEM_BUFS);
635 if (!entry->buflist) {
636 mutex_unlock(&dev->struct_mutex);
637 atomic_dec(&dev->buf_alloc);
638 return -ENOMEM;
639 }
640 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
641
642 entry->buf_size = size;
643 entry->page_order = page_order;
644
645 offset = 0;
646
647 while (entry->buf_count < count) {
648 buf = &entry->buflist[entry->buf_count];
649 buf->idx = dma->buf_count + entry->buf_count;
650 buf->total = alignment;
651 buf->order = order;
652 buf->used = 0;
653
654 buf->offset = (dma->byte_count + offset);
655 buf->bus_address = agp_offset + offset;
656 buf->address = (void *)(agp_offset + offset);
657 buf->next = NULL;
658 buf->waiting = 0;
659 buf->pending = 0;
660 init_waitqueue_head(&buf->dma_wait);
661 buf->file_priv = NULL;
662
663 buf->dev_priv_size = dev->driver->dev_priv_size;
664 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
665 if (!buf->dev_private) {
666 /* Set count correctly so we free the proper amount. */
667 entry->buf_count = count;
668 drm_cleanup_buf_error(dev, entry);
669 mutex_unlock(&dev->struct_mutex);
670 atomic_dec(&dev->buf_alloc);
671 return -ENOMEM;
672 }
673 memset(buf->dev_private, 0, buf->dev_priv_size);
674
675 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
676
677 offset += alignment;
678 entry->buf_count++;
679 byte_count += PAGE_SIZE << page_order;
680 }
681
682 DRM_DEBUG("byte_count: %d\n", byte_count);
683
684 temp_buflist = drm_realloc(dma->buflist,
685 dma->buf_count * sizeof(*dma->buflist),
686 (dma->buf_count + entry->buf_count)
687 * sizeof(*dma->buflist), DRM_MEM_BUFS);
688 if (!temp_buflist) {
689 /* Free the entry because it isn't valid */
690 drm_cleanup_buf_error(dev, entry);
691 mutex_unlock(&dev->struct_mutex);
692 atomic_dec(&dev->buf_alloc);
693 return -ENOMEM;
694 }
695 dma->buflist = temp_buflist;
696
697 for (i = 0; i < entry->buf_count; i++) {
698 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
699 }
700
701 dma->buf_count += entry->buf_count;
702 dma->seg_count += entry->seg_count;
703 dma->page_count += byte_count >> PAGE_SHIFT;
704 dma->byte_count += byte_count;
705
706 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
707 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
708
709 mutex_unlock(&dev->struct_mutex);
710
711 request->count = entry->buf_count;
712 request->size = size;
713
714 dma->flags = _DRM_DMA_USE_AGP;
715
716 atomic_dec(&dev->buf_alloc);
717 return 0;
718 }
719 EXPORT_SYMBOL(drm_addbufs_agp);
720 #endif /* __OS_HAS_AGP */
721
722 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
723 {
724 struct drm_device_dma *dma = dev->dma;
725 int count;
726 int order;
727 int size;
728 int total;
729 int page_order;
730 struct drm_buf_entry *entry;
731 drm_dma_handle_t *dmah;
732 struct drm_buf *buf;
733 int alignment;
734 unsigned long offset;
735 int i;
736 int byte_count;
737 int page_count;
738 unsigned long *temp_pagelist;
739 struct drm_buf **temp_buflist;
740
741 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
742 return -EINVAL;
743
744 if (!dma)
745 return -EINVAL;
746
747 if (!capable(CAP_SYS_ADMIN))
748 return -EPERM;
749
750 count = request->count;
751 order = drm_order(request->size);
752 size = 1 << order;
753
754 DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
755 request->count, request->size, size, order, dev->queue_count);
756
757 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
758 return -EINVAL;
759 if (dev->queue_count)
760 return -EBUSY; /* Not while in use */
761
762 alignment = (request->flags & _DRM_PAGE_ALIGN)
763 ? PAGE_ALIGN(size) : size;
764 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
765 total = PAGE_SIZE << page_order;
766
767 spin_lock(&dev->count_lock);
768 if (dev->buf_use) {
769 spin_unlock(&dev->count_lock);
770 return -EBUSY;
771 }
772 atomic_inc(&dev->buf_alloc);
773 spin_unlock(&dev->count_lock);
774
775 mutex_lock(&dev->struct_mutex);
776 entry = &dma->bufs[order];
777 if (entry->buf_count) {
778 mutex_unlock(&dev->struct_mutex);
779 atomic_dec(&dev->buf_alloc);
780 return -ENOMEM; /* May only call once for each order */
781 }
782
783 if (count < 0 || count > 4096) {
784 mutex_unlock(&dev->struct_mutex);
785 atomic_dec(&dev->buf_alloc);
786 return -EINVAL;
787 }
788
789 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
790 DRM_MEM_BUFS);
791 if (!entry->buflist) {
792 mutex_unlock(&dev->struct_mutex);
793 atomic_dec(&dev->buf_alloc);
794 return -ENOMEM;
795 }
796 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
797
798 entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
799 DRM_MEM_SEGS);
800 if (!entry->seglist) {
801 drm_free(entry->buflist,
802 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
803 mutex_unlock(&dev->struct_mutex);
804 atomic_dec(&dev->buf_alloc);
805 return -ENOMEM;
806 }
807 memset(entry->seglist, 0, count * sizeof(*entry->seglist));
808
809 /* Keep the original pagelist until we know all the allocations
810 * have succeeded
811 */
812 temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
813 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
814 if (!temp_pagelist) {
815 drm_free(entry->buflist,
816 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
817 drm_free(entry->seglist,
818 count * sizeof(*entry->seglist), DRM_MEM_SEGS);
819 mutex_unlock(&dev->struct_mutex);
820 atomic_dec(&dev->buf_alloc);
821 return -ENOMEM;
822 }
823 memcpy(temp_pagelist,
824 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
825 DRM_DEBUG("pagelist: %d entries\n",
826 dma->page_count + (count << page_order));
827
828 entry->buf_size = size;
829 entry->page_order = page_order;
830 byte_count = 0;
831 page_count = 0;
832
833 while (entry->buf_count < count) {
834
835 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
836
837 if (!dmah) {
838 /* Set count correctly so we free the proper amount. */
839 entry->buf_count = count;
840 entry->seg_count = count;
841 drm_cleanup_buf_error(dev, entry);
842 drm_free(temp_pagelist,
843 (dma->page_count + (count << page_order))
844 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
845 mutex_unlock(&dev->struct_mutex);
846 atomic_dec(&dev->buf_alloc);
847 return -ENOMEM;
848 }
849 entry->seglist[entry->seg_count++] = dmah;
850 for (i = 0; i < (1 << page_order); i++) {
851 DRM_DEBUG("page %d @ 0x%08lx\n",
852 dma->page_count + page_count,
853 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
854 temp_pagelist[dma->page_count + page_count++]
855 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
856 }
857 for (offset = 0;
858 offset + size <= total && entry->buf_count < count;
859 offset += alignment, ++entry->buf_count) {
860 buf = &entry->buflist[entry->buf_count];
861 buf->idx = dma->buf_count + entry->buf_count;
862 buf->total = alignment;
863 buf->order = order;
864 buf->used = 0;
865 buf->offset = (dma->byte_count + byte_count + offset);
866 buf->address = (void *)(dmah->vaddr + offset);
867 buf->bus_address = dmah->busaddr + offset;
868 buf->next = NULL;
869 buf->waiting = 0;
870 buf->pending = 0;
871 init_waitqueue_head(&buf->dma_wait);
872 buf->file_priv = NULL;
873
874 buf->dev_priv_size = dev->driver->dev_priv_size;
875 buf->dev_private = drm_alloc(buf->dev_priv_size,
876 DRM_MEM_BUFS);
877 if (!buf->dev_private) {
878 /* Set count correctly so we free the proper amount. */
879 entry->buf_count = count;
880 entry->seg_count = count;
881 drm_cleanup_buf_error(dev, entry);
882 drm_free(temp_pagelist,
883 (dma->page_count +
884 (count << page_order))
885 * sizeof(*dma->pagelist),
886 DRM_MEM_PAGES);
887 mutex_unlock(&dev->struct_mutex);
888 atomic_dec(&dev->buf_alloc);
889 return -ENOMEM;
890 }
891 memset(buf->dev_private, 0, buf->dev_priv_size);
892
893 DRM_DEBUG("buffer %d @ %p\n",
894 entry->buf_count, buf->address);
895 }
896 byte_count += PAGE_SIZE << page_order;
897 }
898
899 temp_buflist = drm_realloc(dma->buflist,
900 dma->buf_count * sizeof(*dma->buflist),
901 (dma->buf_count + entry->buf_count)
902 * sizeof(*dma->buflist), DRM_MEM_BUFS);
903 if (!temp_buflist) {
904 /* Free the entry because it isn't valid */
905 drm_cleanup_buf_error(dev, entry);
906 drm_free(temp_pagelist,
907 (dma->page_count + (count << page_order))
908 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
909 mutex_unlock(&dev->struct_mutex);
910 atomic_dec(&dev->buf_alloc);
911 return -ENOMEM;
912 }
913 dma->buflist = temp_buflist;
914
915 for (i = 0; i < entry->buf_count; i++) {
916 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
917 }
918
919 /* No allocations failed, so now we can replace the orginal pagelist
920 * with the new one.
921 */
922 if (dma->page_count) {
923 drm_free(dma->pagelist,
924 dma->page_count * sizeof(*dma->pagelist),
925 DRM_MEM_PAGES);
926 }
927 dma->pagelist = temp_pagelist;
928
929 dma->buf_count += entry->buf_count;
930 dma->seg_count += entry->seg_count;
931 dma->page_count += entry->seg_count << page_order;
932 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
933
934 mutex_unlock(&dev->struct_mutex);
935
936 request->count = entry->buf_count;
937 request->size = size;
938
939 if (request->flags & _DRM_PCI_BUFFER_RO)
940 dma->flags = _DRM_DMA_USE_PCI_RO;
941
942 atomic_dec(&dev->buf_alloc);
943 return 0;
944
945 }
946 EXPORT_SYMBOL(drm_addbufs_pci);
947
948 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
949 {
950 struct drm_device_dma *dma = dev->dma;
951 struct drm_buf_entry *entry;
952 struct drm_buf *buf;
953 unsigned long offset;
954 unsigned long agp_offset;
955 int count;
956 int order;
957 int size;
958 int alignment;
959 int page_order;
960 int total;
961 int byte_count;
962 int i;
963 struct drm_buf **temp_buflist;
964
965 if (!drm_core_check_feature(dev, DRIVER_SG))
966 return -EINVAL;
967
968 if (!dma)
969 return -EINVAL;
970
971 if (!capable(CAP_SYS_ADMIN))
972 return -EPERM;
973
974 count = request->count;
975 order = drm_order(request->size);
976 size = 1 << order;
977
978 alignment = (request->flags & _DRM_PAGE_ALIGN)
979 ? PAGE_ALIGN(size) : size;
980 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
981 total = PAGE_SIZE << page_order;
982
983 byte_count = 0;
984 agp_offset = request->agp_start;
985
986 DRM_DEBUG("count: %d\n", count);
987 DRM_DEBUG("order: %d\n", order);
988 DRM_DEBUG("size: %d\n", size);
989 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
990 DRM_DEBUG("alignment: %d\n", alignment);
991 DRM_DEBUG("page_order: %d\n", page_order);
992 DRM_DEBUG("total: %d\n", total);
993
994 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
995 return -EINVAL;
996 if (dev->queue_count)
997 return -EBUSY; /* Not while in use */
998
999 spin_lock(&dev->count_lock);
1000 if (dev->buf_use) {
1001 spin_unlock(&dev->count_lock);
1002 return -EBUSY;
1003 }
1004 atomic_inc(&dev->buf_alloc);
1005 spin_unlock(&dev->count_lock);
1006
1007 mutex_lock(&dev->struct_mutex);
1008 entry = &dma->bufs[order];
1009 if (entry->buf_count) {
1010 mutex_unlock(&dev->struct_mutex);
1011 atomic_dec(&dev->buf_alloc);
1012 return -ENOMEM; /* May only call once for each order */
1013 }
1014
1015 if (count < 0 || count > 4096) {
1016 mutex_unlock(&dev->struct_mutex);
1017 atomic_dec(&dev->buf_alloc);
1018 return -EINVAL;
1019 }
1020
1021 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1022 DRM_MEM_BUFS);
1023 if (!entry->buflist) {
1024 mutex_unlock(&dev->struct_mutex);
1025 atomic_dec(&dev->buf_alloc);
1026 return -ENOMEM;
1027 }
1028 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1029
1030 entry->buf_size = size;
1031 entry->page_order = page_order;
1032
1033 offset = 0;
1034
1035 while (entry->buf_count < count) {
1036 buf = &entry->buflist[entry->buf_count];
1037 buf->idx = dma->buf_count + entry->buf_count;
1038 buf->total = alignment;
1039 buf->order = order;
1040 buf->used = 0;
1041
1042 buf->offset = (dma->byte_count + offset);
1043 buf->bus_address = agp_offset + offset;
1044 buf->address = (void *)(agp_offset + offset
1045 + (unsigned long)dev->sg->virtual);
1046 buf->next = NULL;
1047 buf->waiting = 0;
1048 buf->pending = 0;
1049 init_waitqueue_head(&buf->dma_wait);
1050 buf->file_priv = NULL;
1051
1052 buf->dev_priv_size = dev->driver->dev_priv_size;
1053 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1054 if (!buf->dev_private) {
1055 /* Set count correctly so we free the proper amount. */
1056 entry->buf_count = count;
1057 drm_cleanup_buf_error(dev, entry);
1058 mutex_unlock(&dev->struct_mutex);
1059 atomic_dec(&dev->buf_alloc);
1060 return -ENOMEM;
1061 }
1062
1063 memset(buf->dev_private, 0, buf->dev_priv_size);
1064
1065 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1066
1067 offset += alignment;
1068 entry->buf_count++;
1069 byte_count += PAGE_SIZE << page_order;
1070 }
1071
1072 DRM_DEBUG("byte_count: %d\n", byte_count);
1073
1074 temp_buflist = drm_realloc(dma->buflist,
1075 dma->buf_count * sizeof(*dma->buflist),
1076 (dma->buf_count + entry->buf_count)
1077 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1078 if (!temp_buflist) {
1079 /* Free the entry because it isn't valid */
1080 drm_cleanup_buf_error(dev, entry);
1081 mutex_unlock(&dev->struct_mutex);
1082 atomic_dec(&dev->buf_alloc);
1083 return -ENOMEM;
1084 }
1085 dma->buflist = temp_buflist;
1086
1087 for (i = 0; i < entry->buf_count; i++) {
1088 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1089 }
1090
1091 dma->buf_count += entry->buf_count;
1092 dma->seg_count += entry->seg_count;
1093 dma->page_count += byte_count >> PAGE_SHIFT;
1094 dma->byte_count += byte_count;
1095
1096 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1097 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1098
1099 mutex_unlock(&dev->struct_mutex);
1100
1101 request->count = entry->buf_count;
1102 request->size = size;
1103
1104 dma->flags = _DRM_DMA_USE_SG;
1105
1106 atomic_dec(&dev->buf_alloc);
1107 return 0;
1108 }
1109
1110 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1111 {
1112 struct drm_device_dma *dma = dev->dma;
1113 struct drm_buf_entry *entry;
1114 struct drm_buf *buf;
1115 unsigned long offset;
1116 unsigned long agp_offset;
1117 int count;
1118 int order;
1119 int size;
1120 int alignment;
1121 int page_order;
1122 int total;
1123 int byte_count;
1124 int i;
1125 struct drm_buf **temp_buflist;
1126
1127 if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1128 return -EINVAL;
1129
1130 if (!dma)
1131 return -EINVAL;
1132
1133 if (!capable(CAP_SYS_ADMIN))
1134 return -EPERM;
1135
1136 count = request->count;
1137 order = drm_order(request->size);
1138 size = 1 << order;
1139
1140 alignment = (request->flags & _DRM_PAGE_ALIGN)
1141 ? PAGE_ALIGN(size) : size;
1142 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1143 total = PAGE_SIZE << page_order;
1144
1145 byte_count = 0;
1146 agp_offset = request->agp_start;
1147
1148 DRM_DEBUG("count: %d\n", count);
1149 DRM_DEBUG("order: %d\n", order);
1150 DRM_DEBUG("size: %d\n", size);
1151 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1152 DRM_DEBUG("alignment: %d\n", alignment);
1153 DRM_DEBUG("page_order: %d\n", page_order);
1154 DRM_DEBUG("total: %d\n", total);
1155
1156 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1157 return -EINVAL;
1158 if (dev->queue_count)
1159 return -EBUSY; /* Not while in use */
1160
1161 spin_lock(&dev->count_lock);
1162 if (dev->buf_use) {
1163 spin_unlock(&dev->count_lock);
1164 return -EBUSY;
1165 }
1166 atomic_inc(&dev->buf_alloc);
1167 spin_unlock(&dev->count_lock);
1168
1169 mutex_lock(&dev->struct_mutex);
1170 entry = &dma->bufs[order];
1171 if (entry->buf_count) {
1172 mutex_unlock(&dev->struct_mutex);
1173 atomic_dec(&dev->buf_alloc);
1174 return -ENOMEM; /* May only call once for each order */
1175 }
1176
1177 if (count < 0 || count > 4096) {
1178 mutex_unlock(&dev->struct_mutex);
1179 atomic_dec(&dev->buf_alloc);
1180 return -EINVAL;
1181 }
1182
1183 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1184 DRM_MEM_BUFS);
1185 if (!entry->buflist) {
1186 mutex_unlock(&dev->struct_mutex);
1187 atomic_dec(&dev->buf_alloc);
1188 return -ENOMEM;
1189 }
1190 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1191
1192 entry->buf_size = size;
1193 entry->page_order = page_order;
1194
1195 offset = 0;
1196
1197 while (entry->buf_count < count) {
1198 buf = &entry->buflist[entry->buf_count];
1199 buf->idx = dma->buf_count + entry->buf_count;
1200 buf->total = alignment;
1201 buf->order = order;
1202 buf->used = 0;
1203
1204 buf->offset = (dma->byte_count + offset);
1205 buf->bus_address = agp_offset + offset;
1206 buf->address = (void *)(agp_offset + offset);
1207 buf->next = NULL;
1208 buf->waiting = 0;
1209 buf->pending = 0;
1210 init_waitqueue_head(&buf->dma_wait);
1211 buf->file_priv = NULL;
1212
1213 buf->dev_priv_size = dev->driver->dev_priv_size;
1214 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1215 if (!buf->dev_private) {
1216 /* Set count correctly so we free the proper amount. */
1217 entry->buf_count = count;
1218 drm_cleanup_buf_error(dev, entry);
1219 mutex_unlock(&dev->struct_mutex);
1220 atomic_dec(&dev->buf_alloc);
1221 return -ENOMEM;
1222 }
1223 memset(buf->dev_private, 0, buf->dev_priv_size);
1224
1225 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1226
1227 offset += alignment;
1228 entry->buf_count++;
1229 byte_count += PAGE_SIZE << page_order;
1230 }
1231
1232 DRM_DEBUG("byte_count: %d\n", byte_count);
1233
1234 temp_buflist = drm_realloc(dma->buflist,
1235 dma->buf_count * sizeof(*dma->buflist),
1236 (dma->buf_count + entry->buf_count)
1237 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1238 if (!temp_buflist) {
1239 /* Free the entry because it isn't valid */
1240 drm_cleanup_buf_error(dev, entry);
1241 mutex_unlock(&dev->struct_mutex);
1242 atomic_dec(&dev->buf_alloc);
1243 return -ENOMEM;
1244 }
1245 dma->buflist = temp_buflist;
1246
1247 for (i = 0; i < entry->buf_count; i++) {
1248 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1249 }
1250
1251 dma->buf_count += entry->buf_count;
1252 dma->seg_count += entry->seg_count;
1253 dma->page_count += byte_count >> PAGE_SHIFT;
1254 dma->byte_count += byte_count;
1255
1256 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1257 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1258
1259 mutex_unlock(&dev->struct_mutex);
1260
1261 request->count = entry->buf_count;
1262 request->size = size;
1263
1264 dma->flags = _DRM_DMA_USE_FB;
1265
1266 atomic_dec(&dev->buf_alloc);
1267 return 0;
1268 }
1269
1270
1271 /**
1272 * Add buffers for DMA transfers (ioctl).
1273 *
1274 * \param inode device inode.
1275 * \param file_priv DRM file private.
1276 * \param cmd command.
1277 * \param arg pointer to a struct drm_buf_desc request.
1278 * \return zero on success or a negative number on failure.
1279 *
1280 * According with the memory type specified in drm_buf_desc::flags and the
1281 * build options, it dispatches the call either to addbufs_agp(),
1282 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1283 * PCI memory respectively.
1284 */
1285 int drm_addbufs(struct drm_device *dev, void *data,
1286 struct drm_file *file_priv)
1287 {
1288 struct drm_buf_desc *request = data;
1289 int ret;
1290
1291 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1292 return -EINVAL;
1293
1294 #if __OS_HAS_AGP
1295 if (request->flags & _DRM_AGP_BUFFER)
1296 ret = drm_addbufs_agp(dev, request);
1297 else
1298 #endif
1299 if (request->flags & _DRM_SG_BUFFER)
1300 ret = drm_addbufs_sg(dev, request);
1301 else if (request->flags & _DRM_FB_BUFFER)
1302 ret = drm_addbufs_fb(dev, request);
1303 else
1304 ret = drm_addbufs_pci(dev, request);
1305
1306 return ret;
1307 }
1308
1309 /**
1310 * Get information about the buffer mappings.
1311 *
1312 * This was originally mean for debugging purposes, or by a sophisticated
1313 * client library to determine how best to use the available buffers (e.g.,
1314 * large buffers can be used for image transfer).
1315 *
1316 * \param inode device inode.
1317 * \param file_priv DRM file private.
1318 * \param cmd command.
1319 * \param arg pointer to a drm_buf_info structure.
1320 * \return zero on success or a negative number on failure.
1321 *
1322 * Increments drm_device::buf_use while holding the drm_device::count_lock
1323 * lock, preventing of allocating more buffers after this call. Information
1324 * about each requested buffer is then copied into user space.
1325 */
1326 int drm_infobufs(struct drm_device *dev, void *data,
1327 struct drm_file *file_priv)
1328 {
1329 struct drm_device_dma *dma = dev->dma;
1330 struct drm_buf_info *request = data;
1331 int i;
1332 int count;
1333
1334 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1335 return -EINVAL;
1336
1337 if (!dma)
1338 return -EINVAL;
1339
1340 spin_lock(&dev->count_lock);
1341 if (atomic_read(&dev->buf_alloc)) {
1342 spin_unlock(&dev->count_lock);
1343 return -EBUSY;
1344 }
1345 ++dev->buf_use; /* Can't allocate more after this call */
1346 spin_unlock(&dev->count_lock);
1347
1348 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1349 if (dma->bufs[i].buf_count)
1350 ++count;
1351 }
1352
1353 DRM_DEBUG("count = %d\n", count);
1354
1355 if (request->count >= count) {
1356 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1357 if (dma->bufs[i].buf_count) {
1358 struct drm_buf_desc __user *to =
1359 &request->list[count];
1360 struct drm_buf_entry *from = &dma->bufs[i];
1361 struct drm_freelist *list = &dma->bufs[i].freelist;
1362 if (copy_to_user(&to->count,
1363 &from->buf_count,
1364 sizeof(from->buf_count)) ||
1365 copy_to_user(&to->size,
1366 &from->buf_size,
1367 sizeof(from->buf_size)) ||
1368 copy_to_user(&to->low_mark,
1369 &list->low_mark,
1370 sizeof(list->low_mark)) ||
1371 copy_to_user(&to->high_mark,
1372 &list->high_mark,
1373 sizeof(list->high_mark)))
1374 return -EFAULT;
1375
1376 DRM_DEBUG("%d %d %d %d %d\n",
1377 i,
1378 dma->bufs[i].buf_count,
1379 dma->bufs[i].buf_size,
1380 dma->bufs[i].freelist.low_mark,
1381 dma->bufs[i].freelist.high_mark);
1382 ++count;
1383 }
1384 }
1385 }
1386 request->count = count;
1387
1388 return 0;
1389 }
1390
1391 /**
1392 * Specifies a low and high water mark for buffer allocation
1393 *
1394 * \param inode device inode.
1395 * \param file_priv DRM file private.
1396 * \param cmd command.
1397 * \param arg a pointer to a drm_buf_desc structure.
1398 * \return zero on success or a negative number on failure.
1399 *
1400 * Verifies that the size order is bounded between the admissible orders and
1401 * updates the respective drm_device_dma::bufs entry low and high water mark.
1402 *
1403 * \note This ioctl is deprecated and mostly never used.
1404 */
1405 int drm_markbufs(struct drm_device *dev, void *data,
1406 struct drm_file *file_priv)
1407 {
1408 struct drm_device_dma *dma = dev->dma;
1409 struct drm_buf_desc *request = data;
1410 int order;
1411 struct drm_buf_entry *entry;
1412
1413 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1414 return -EINVAL;
1415
1416 if (!dma)
1417 return -EINVAL;
1418
1419 DRM_DEBUG("%d, %d, %d\n",
1420 request->size, request->low_mark, request->high_mark);
1421 order = drm_order(request->size);
1422 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1423 return -EINVAL;
1424 entry = &dma->bufs[order];
1425
1426 if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1427 return -EINVAL;
1428 if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1429 return -EINVAL;
1430
1431 entry->freelist.low_mark = request->low_mark;
1432 entry->freelist.high_mark = request->high_mark;
1433
1434 return 0;
1435 }
1436
1437 /**
1438 * Unreserve the buffers in list, previously reserved using drmDMA.
1439 *
1440 * \param inode device inode.
1441 * \param file_priv DRM file private.
1442 * \param cmd command.
1443 * \param arg pointer to a drm_buf_free structure.
1444 * \return zero on success or a negative number on failure.
1445 *
1446 * Calls free_buffer() for each used buffer.
1447 * This function is primarily used for debugging.
1448 */
1449 int drm_freebufs(struct drm_device *dev, void *data,
1450 struct drm_file *file_priv)
1451 {
1452 struct drm_device_dma *dma = dev->dma;
1453 struct drm_buf_free *request = data;
1454 int i;
1455 int idx;
1456 struct drm_buf *buf;
1457
1458 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1459 return -EINVAL;
1460
1461 if (!dma)
1462 return -EINVAL;
1463
1464 DRM_DEBUG("%d\n", request->count);
1465 for (i = 0; i < request->count; i++) {
1466 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1467 return -EFAULT;
1468 if (idx < 0 || idx >= dma->buf_count) {
1469 DRM_ERROR("Index %d (of %d max)\n",
1470 idx, dma->buf_count - 1);
1471 return -EINVAL;
1472 }
1473 buf = dma->buflist[idx];
1474 if (buf->file_priv != file_priv) {
1475 DRM_ERROR("Process %d freeing buffer not owned\n",
1476 task_pid_nr(current));
1477 return -EINVAL;
1478 }
1479 drm_free_buffer(dev, buf);
1480 }
1481
1482 return 0;
1483 }
1484
1485 /**
1486 * Maps all of the DMA buffers into client-virtual space (ioctl).
1487 *
1488 * \param inode device inode.
1489 * \param file_priv DRM file private.
1490 * \param cmd command.
1491 * \param arg pointer to a drm_buf_map structure.
1492 * \return zero on success or a negative number on failure.
1493 *
1494 * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1495 * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1496 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1497 * drm_mmap_dma().
1498 */
1499 int drm_mapbufs(struct drm_device *dev, void *data,
1500 struct drm_file *file_priv)
1501 {
1502 struct drm_device_dma *dma = dev->dma;
1503 int retcode = 0;
1504 const int zero = 0;
1505 unsigned long virtual;
1506 unsigned long address;
1507 struct drm_buf_map *request = data;
1508 int i;
1509
1510 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1511 return -EINVAL;
1512
1513 if (!dma)
1514 return -EINVAL;
1515
1516 spin_lock(&dev->count_lock);
1517 if (atomic_read(&dev->buf_alloc)) {
1518 spin_unlock(&dev->count_lock);
1519 return -EBUSY;
1520 }
1521 dev->buf_use++; /* Can't allocate more after this call */
1522 spin_unlock(&dev->count_lock);
1523
1524 if (request->count >= dma->buf_count) {
1525 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1526 || (drm_core_check_feature(dev, DRIVER_SG)
1527 && (dma->flags & _DRM_DMA_USE_SG))
1528 || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1529 && (dma->flags & _DRM_DMA_USE_FB))) {
1530 struct drm_map *map = dev->agp_buffer_map;
1531 unsigned long token = dev->agp_buffer_token;
1532
1533 if (!map) {
1534 retcode = -EINVAL;
1535 goto done;
1536 }
1537 down_write(&current->mm->mmap_sem);
1538 virtual = do_mmap(file_priv->filp, 0, map->size,
1539 PROT_READ | PROT_WRITE,
1540 MAP_SHARED,
1541 token);
1542 up_write(&current->mm->mmap_sem);
1543 } else {
1544 down_write(&current->mm->mmap_sem);
1545 virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1546 PROT_READ | PROT_WRITE,
1547 MAP_SHARED, 0);
1548 up_write(&current->mm->mmap_sem);
1549 }
1550 if (virtual > -1024UL) {
1551 /* Real error */
1552 retcode = (signed long)virtual;
1553 goto done;
1554 }
1555 request->virtual = (void __user *)virtual;
1556
1557 for (i = 0; i < dma->buf_count; i++) {
1558 if (copy_to_user(&request->list[i].idx,
1559 &dma->buflist[i]->idx,
1560 sizeof(request->list[0].idx))) {
1561 retcode = -EFAULT;
1562 goto done;
1563 }
1564 if (copy_to_user(&request->list[i].total,
1565 &dma->buflist[i]->total,
1566 sizeof(request->list[0].total))) {
1567 retcode = -EFAULT;
1568 goto done;
1569 }
1570 if (copy_to_user(&request->list[i].used,
1571 &zero, sizeof(zero))) {
1572 retcode = -EFAULT;
1573 goto done;
1574 }
1575 address = virtual + dma->buflist[i]->offset; /* *** */
1576 if (copy_to_user(&request->list[i].address,
1577 &address, sizeof(address))) {
1578 retcode = -EFAULT;
1579 goto done;
1580 }
1581 }
1582 }
1583 done:
1584 request->count = dma->buf_count;
1585 DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1586
1587 return retcode;
1588 }
1589
1590 /**
1591 * Compute size order. Returns the exponent of the smaller power of two which
1592 * is greater or equal to given number.
1593 *
1594 * \param size size.
1595 * \return order.
1596 *
1597 * \todo Can be made faster.
1598 */
1599 int drm_order(unsigned long size)
1600 {
1601 int order;
1602 unsigned long tmp;
1603
1604 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1605
1606 if (size & (size - 1))
1607 ++order;
1608
1609 return order;
1610 }
1611 EXPORT_SYMBOL(drm_order);
linux kernel for loongson