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Linux 4.1.16
[linux/fpc-iii.git] / drivers / gpu / drm / drm_bufs.c
blob569064a00693eb2932186d72eddfda8b2aa74d5c
1 /*
2 * Legacy: Generic DRM Buffer Management
3 *
4 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * All Rights Reserved.
7 *
8 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
9 * Author: Gareth Hughes <gareth@valinux.com>
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
17 *
18 * The above copyright notice and this permission notice (including the next
19 * paragraph) shall be included in all copies or substantial portions of the
20 * Software.
21 *
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28 * OTHER DEALINGS IN THE SOFTWARE.
29 */
30
31 #include <linux/vmalloc.h>
32 #include <linux/slab.h>
33 #include <linux/log2.h>
34 #include <linux/export.h>
35 #include <asm/shmparam.h>
36 #include <drm/drmP.h>
37 #include "drm_legacy.h"
38
39 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
40 struct drm_local_map *map)
41 {
42 struct drm_map_list *entry;
43 list_for_each_entry(entry, &dev->maplist, head) {
44 /*
45 * Because the kernel-userspace ABI is fixed at a 32-bit offset
46 * while PCI resources may live above that, we only compare the
47 * lower 32 bits of the map offset for maps of type
48 * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
49 * It is assumed that if a driver have more than one resource
50 * of each type, the lower 32 bits are different.
51 */
52 if (!entry->map ||
53 map->type != entry->map->type ||
54 entry->master != dev->primary->master)
55 continue;
56 switch (map->type) {
57 case _DRM_SHM:
58 if (map->flags != _DRM_CONTAINS_LOCK)
59 break;
60 return entry;
61 case _DRM_REGISTERS:
62 case _DRM_FRAME_BUFFER:
63 if ((entry->map->offset & 0xffffffff) ==
64 (map->offset & 0xffffffff))
65 return entry;
66 default: /* Make gcc happy */
67 ;
68 }
69 if (entry->map->offset == map->offset)
70 return entry;
71 }
72
73 return NULL;
74 }
75
76 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
77 unsigned long user_token, int hashed_handle, int shm)
78 {
79 int use_hashed_handle, shift;
80 unsigned long add;
81
82 #if (BITS_PER_LONG == 64)
83 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
84 #elif (BITS_PER_LONG == 32)
85 use_hashed_handle = hashed_handle;
86 #else
87 #error Unsupported long size. Neither 64 nor 32 bits.
88 #endif
89
90 if (!use_hashed_handle) {
91 int ret;
92 hash->key = user_token >> PAGE_SHIFT;
93 ret = drm_ht_insert_item(&dev->map_hash, hash);
94 if (ret != -EINVAL)
95 return ret;
96 }
97
98 shift = 0;
99 add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
100 if (shm && (SHMLBA > PAGE_SIZE)) {
101 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
102
103 /* For shared memory, we have to preserve the SHMLBA
104 * bits of the eventual vma->vm_pgoff value during
105 * mmap(). Otherwise we run into cache aliasing problems
106 * on some platforms. On these platforms, the pgoff of
107 * a mmap() request is used to pick a suitable virtual
108 * address for the mmap() region such that it will not
109 * cause cache aliasing problems.
110 *
111 * Therefore, make sure the SHMLBA relevant bits of the
112 * hash value we use are equal to those in the original
113 * kernel virtual address.
114 */
115 shift = bits;
116 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
117 }
118
119 return drm_ht_just_insert_please(&dev->map_hash, hash,
120 user_token, 32 - PAGE_SHIFT - 3,
121 shift, add);
122 }
123
124 /**
125 * Core function to create a range of memory available for mapping by a
126 * non-root process.
127 *
128 * Adjusts the memory offset to its absolute value according to the mapping
129 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
130 * applicable and if supported by the kernel.
131 */
132 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
133 unsigned int size, enum drm_map_type type,
134 enum drm_map_flags flags,
135 struct drm_map_list ** maplist)
136 {
137 struct drm_local_map *map;
138 struct drm_map_list *list;
139 drm_dma_handle_t *dmah;
140 unsigned long user_token;
141 int ret;
142
143 map = kmalloc(sizeof(*map), GFP_KERNEL);
144 if (!map)
145 return -ENOMEM;
146
147 map->offset = offset;
148 map->size = size;
149 map->flags = flags;
150 map->type = type;
151
152 /* Only allow shared memory to be removable since we only keep enough
153 * book keeping information about shared memory to allow for removal
154 * when processes fork.
155 */
156 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
157 kfree(map);
158 return -EINVAL;
159 }
160 DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
161 (unsigned long long)map->offset, map->size, map->type);
162
163 /* page-align _DRM_SHM maps. They are allocated here so there is no security
164 * hole created by that and it works around various broken drivers that use
165 * a non-aligned quantity to map the SAREA. --BenH
166 */
167 if (map->type == _DRM_SHM)
168 map->size = PAGE_ALIGN(map->size);
169
170 if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
171 kfree(map);
172 return -EINVAL;
173 }
174 map->mtrr = -1;
175 map->handle = NULL;
176
177 switch (map->type) {
178 case _DRM_REGISTERS:
179 case _DRM_FRAME_BUFFER:
180 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
181 if (map->offset + (map->size-1) < map->offset ||
182 map->offset < virt_to_phys(high_memory)) {
183 kfree(map);
184 return -EINVAL;
185 }
186 #endif
187 /* Some drivers preinitialize some maps, without the X Server
188 * needing to be aware of it. Therefore, we just return success
189 * when the server tries to create a duplicate map.
190 */
191 list = drm_find_matching_map(dev, map);
192 if (list != NULL) {
193 if (list->map->size != map->size) {
194 DRM_DEBUG("Matching maps of type %d with "
195 "mismatched sizes, (%ld vs %ld)\n",
196 map->type, map->size,
197 list->map->size);
198 list->map->size = map->size;
199 }
200
201 kfree(map);
202 *maplist = list;
203 return 0;
204 }
205
206 if (map->type == _DRM_FRAME_BUFFER ||
207 (map->flags & _DRM_WRITE_COMBINING)) {
208 map->mtrr =
209 arch_phys_wc_add(map->offset, map->size);
210 }
211 if (map->type == _DRM_REGISTERS) {
212 if (map->flags & _DRM_WRITE_COMBINING)
213 map->handle = ioremap_wc(map->offset,
214 map->size);
215 else
216 map->handle = ioremap(map->offset, map->size);
217 if (!map->handle) {
218 kfree(map);
219 return -ENOMEM;
220 }
221 }
222
223 break;
224 case _DRM_SHM:
225 list = drm_find_matching_map(dev, map);
226 if (list != NULL) {
227 if(list->map->size != map->size) {
228 DRM_DEBUG("Matching maps of type %d with "
229 "mismatched sizes, (%ld vs %ld)\n",
230 map->type, map->size, list->map->size);
231 list->map->size = map->size;
232 }
233
234 kfree(map);
235 *maplist = list;
236 return 0;
237 }
238 map->handle = vmalloc_user(map->size);
239 DRM_DEBUG("%lu %d %p\n",
240 map->size, order_base_2(map->size), map->handle);
241 if (!map->handle) {
242 kfree(map);
243 return -ENOMEM;
244 }
245 map->offset = (unsigned long)map->handle;
246 if (map->flags & _DRM_CONTAINS_LOCK) {
247 /* Prevent a 2nd X Server from creating a 2nd lock */
248 if (dev->primary->master->lock.hw_lock != NULL) {
249 vfree(map->handle);
250 kfree(map);
251 return -EBUSY;
252 }
253 dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */
254 }
255 break;
256 case _DRM_AGP: {
257 struct drm_agp_mem *entry;
258 int valid = 0;
259
260 if (!dev->agp) {
261 kfree(map);
262 return -EINVAL;
263 }
264 #ifdef __alpha__
265 map->offset += dev->hose->mem_space->start;
266 #endif
267 /* In some cases (i810 driver), user space may have already
268 * added the AGP base itself, because dev->agp->base previously
269 * only got set during AGP enable. So, only add the base
270 * address if the map's offset isn't already within the
271 * aperture.
272 */
273 if (map->offset < dev->agp->base ||
274 map->offset > dev->agp->base +
275 dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
276 map->offset += dev->agp->base;
277 }
278 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
279
280 /* This assumes the DRM is in total control of AGP space.
281 * It's not always the case as AGP can be in the control
282 * of user space (i.e. i810 driver). So this loop will get
283 * skipped and we double check that dev->agp->memory is
284 * actually set as well as being invalid before EPERM'ing
285 */
286 list_for_each_entry(entry, &dev->agp->memory, head) {
287 if ((map->offset >= entry->bound) &&
288 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
289 valid = 1;
290 break;
291 }
292 }
293 if (!list_empty(&dev->agp->memory) && !valid) {
294 kfree(map);
295 return -EPERM;
296 }
297 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
298 (unsigned long long)map->offset, map->size);
299
300 break;
301 }
302 case _DRM_SCATTER_GATHER:
303 if (!dev->sg) {
304 kfree(map);
305 return -EINVAL;
306 }
307 map->offset += (unsigned long)dev->sg->virtual;
308 break;
309 case _DRM_CONSISTENT:
310 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
311 * As we're limiting the address to 2^32-1 (or less),
312 * casting it down to 32 bits is no problem, but we
313 * need to point to a 64bit variable first. */
314 dmah = drm_pci_alloc(dev, map->size, map->size);
315 if (!dmah) {
316 kfree(map);
317 return -ENOMEM;
318 }
319 map->handle = dmah->vaddr;
320 map->offset = (unsigned long)dmah->busaddr;
321 kfree(dmah);
322 break;
323 default:
324 kfree(map);
325 return -EINVAL;
326 }
327
328 list = kzalloc(sizeof(*list), GFP_KERNEL);
329 if (!list) {
330 if (map->type == _DRM_REGISTERS)
331 iounmap(map->handle);
332 kfree(map);
333 return -EINVAL;
334 }
335 list->map = map;
336
337 mutex_lock(&dev->struct_mutex);
338 list_add(&list->head, &dev->maplist);
339
340 /* Assign a 32-bit handle */
341 /* We do it here so that dev->struct_mutex protects the increment */
342 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
343 map->offset;
344 ret = drm_map_handle(dev, &list->hash, user_token, 0,
345 (map->type == _DRM_SHM));
346 if (ret) {
347 if (map->type == _DRM_REGISTERS)
348 iounmap(map->handle);
349 kfree(map);
350 kfree(list);
351 mutex_unlock(&dev->struct_mutex);
352 return ret;
353 }
354
355 list->user_token = list->hash.key << PAGE_SHIFT;
356 mutex_unlock(&dev->struct_mutex);
357
358 if (!(map->flags & _DRM_DRIVER))
359 list->master = dev->primary->master;
360 *maplist = list;
361 return 0;
362 }
363
364 int drm_legacy_addmap(struct drm_device * dev, resource_size_t offset,
365 unsigned int size, enum drm_map_type type,
366 enum drm_map_flags flags, struct drm_local_map **map_ptr)
367 {
368 struct drm_map_list *list;
369 int rc;
370
371 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
372 if (!rc)
373 *map_ptr = list->map;
374 return rc;
375 }
376 EXPORT_SYMBOL(drm_legacy_addmap);
377
378 /**
379 * Ioctl to specify a range of memory that is available for mapping by a
380 * non-root process.
381 *
382 * \param inode device inode.
383 * \param file_priv DRM file private.
384 * \param cmd command.
385 * \param arg pointer to a drm_map structure.
386 * \return zero on success or a negative value on error.
387 *
388 */
389 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
390 struct drm_file *file_priv)
391 {
392 struct drm_map *map = data;
393 struct drm_map_list *maplist;
394 int err;
395
396 if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
397 return -EPERM;
398
399 err = drm_addmap_core(dev, map->offset, map->size, map->type,
400 map->flags, &maplist);
401
402 if (err)
403 return err;
404
405 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
406 map->handle = (void *)(unsigned long)maplist->user_token;
407
408 /*
409 * It appears that there are no users of this value whatsoever --
410 * drmAddMap just discards it. Let's not encourage its use.
411 * (Keeping drm_addmap_core's returned mtrr value would be wrong --
412 * it's not a real mtrr index anymore.)
413 */
414 map->mtrr = -1;
415
416 return 0;
417 }
418
419 /**
420 * Remove a map private from list and deallocate resources if the mapping
421 * isn't in use.
422 *
423 * Searches the map on drm_device::maplist, removes it from the list, see if
424 * its being used, and free any associate resource (such as MTRR's) if it's not
425 * being on use.
426 *
427 * \sa drm_legacy_addmap
428 */
429 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
430 {
431 struct drm_map_list *r_list = NULL, *list_t;
432 drm_dma_handle_t dmah;
433 int found = 0;
434 struct drm_master *master;
435
436 /* Find the list entry for the map and remove it */
437 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
438 if (r_list->map == map) {
439 master = r_list->master;
440 list_del(&r_list->head);
441 drm_ht_remove_key(&dev->map_hash,
442 r_list->user_token >> PAGE_SHIFT);
443 kfree(r_list);
444 found = 1;
445 break;
446 }
447 }
448
449 if (!found)
450 return -EINVAL;
451
452 switch (map->type) {
453 case _DRM_REGISTERS:
454 iounmap(map->handle);
455 /* FALLTHROUGH */
456 case _DRM_FRAME_BUFFER:
457 arch_phys_wc_del(map->mtrr);
458 break;
459 case _DRM_SHM:
460 vfree(map->handle);
461 if (master) {
462 if (dev->sigdata.lock == master->lock.hw_lock)
463 dev->sigdata.lock = NULL;
464 master->lock.hw_lock = NULL; /* SHM removed */
465 master->lock.file_priv = NULL;
466 wake_up_interruptible_all(&master->lock.lock_queue);
467 }
468 break;
469 case _DRM_AGP:
470 case _DRM_SCATTER_GATHER:
471 break;
472 case _DRM_CONSISTENT:
473 dmah.vaddr = map->handle;
474 dmah.busaddr = map->offset;
475 dmah.size = map->size;
476 __drm_legacy_pci_free(dev, &dmah);
477 break;
478 }
479 kfree(map);
480
481 return 0;
482 }
483 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
484
485 int drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
486 {
487 int ret;
488
489 mutex_lock(&dev->struct_mutex);
490 ret = drm_legacy_rmmap_locked(dev, map);
491 mutex_unlock(&dev->struct_mutex);
492
493 return ret;
494 }
495 EXPORT_SYMBOL(drm_legacy_rmmap);
496
497 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
498 * the last close of the device, and this is necessary for cleanup when things
499 * exit uncleanly. Therefore, having userland manually remove mappings seems
500 * like a pointless exercise since they're going away anyway.
501 *
502 * One use case might be after addmap is allowed for normal users for SHM and
503 * gets used by drivers that the server doesn't need to care about. This seems
504 * unlikely.
505 *
506 * \param inode device inode.
507 * \param file_priv DRM file private.
508 * \param cmd command.
509 * \param arg pointer to a struct drm_map structure.
510 * \return zero on success or a negative value on error.
511 */
512 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
513 struct drm_file *file_priv)
514 {
515 struct drm_map *request = data;
516 struct drm_local_map *map = NULL;
517 struct drm_map_list *r_list;
518 int ret;
519
520 mutex_lock(&dev->struct_mutex);
521 list_for_each_entry(r_list, &dev->maplist, head) {
522 if (r_list->map &&
523 r_list->user_token == (unsigned long)request->handle &&
524 r_list->map->flags & _DRM_REMOVABLE) {
525 map = r_list->map;
526 break;
527 }
528 }
529
530 /* List has wrapped around to the head pointer, or its empty we didn't
531 * find anything.
532 */
533 if (list_empty(&dev->maplist) || !map) {
534 mutex_unlock(&dev->struct_mutex);
535 return -EINVAL;
536 }
537
538 /* Register and framebuffer maps are permanent */
539 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
540 mutex_unlock(&dev->struct_mutex);
541 return 0;
542 }
543
544 ret = drm_legacy_rmmap_locked(dev, map);
545
546 mutex_unlock(&dev->struct_mutex);
547
548 return ret;
549 }
550
551 /**
552 * Cleanup after an error on one of the addbufs() functions.
553 *
554 * \param dev DRM device.
555 * \param entry buffer entry where the error occurred.
556 *
557 * Frees any pages and buffers associated with the given entry.
558 */
559 static void drm_cleanup_buf_error(struct drm_device * dev,
560 struct drm_buf_entry * entry)
561 {
562 int i;
563
564 if (entry->seg_count) {
565 for (i = 0; i < entry->seg_count; i++) {
566 if (entry->seglist[i]) {
567 drm_pci_free(dev, entry->seglist[i]);
568 }
569 }
570 kfree(entry->seglist);
571
572 entry->seg_count = 0;
573 }
574
575 if (entry->buf_count) {
576 for (i = 0; i < entry->buf_count; i++) {
577 kfree(entry->buflist[i].dev_private);
578 }
579 kfree(entry->buflist);
580
581 entry->buf_count = 0;
582 }
583 }
584
585 #if __OS_HAS_AGP
586 /**
587 * Add AGP buffers for DMA transfers.
588 *
589 * \param dev struct drm_device to which the buffers are to be added.
590 * \param request pointer to a struct drm_buf_desc describing the request.
591 * \return zero on success or a negative number on failure.
592 *
593 * After some sanity checks creates a drm_buf structure for each buffer and
594 * reallocates the buffer list of the same size order to accommodate the new
595 * buffers.
596 */
597 int drm_legacy_addbufs_agp(struct drm_device *dev,
598 struct drm_buf_desc *request)
599 {
600 struct drm_device_dma *dma = dev->dma;
601 struct drm_buf_entry *entry;
602 struct drm_agp_mem *agp_entry;
603 struct drm_buf *buf;
604 unsigned long offset;
605 unsigned long agp_offset;
606 int count;
607 int order;
608 int size;
609 int alignment;
610 int page_order;
611 int total;
612 int byte_count;
613 int i, valid;
614 struct drm_buf **temp_buflist;
615
616 if (!dma)
617 return -EINVAL;
618
619 count = request->count;
620 order = order_base_2(request->size);
621 size = 1 << order;
622
623 alignment = (request->flags & _DRM_PAGE_ALIGN)
624 ? PAGE_ALIGN(size) : size;
625 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
626 total = PAGE_SIZE << page_order;
627
628 byte_count = 0;
629 agp_offset = dev->agp->base + request->agp_start;
630
631 DRM_DEBUG("count: %d\n", count);
632 DRM_DEBUG("order: %d\n", order);
633 DRM_DEBUG("size: %d\n", size);
634 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
635 DRM_DEBUG("alignment: %d\n", alignment);
636 DRM_DEBUG("page_order: %d\n", page_order);
637 DRM_DEBUG("total: %d\n", total);
638
639 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
640 return -EINVAL;
641
642 /* Make sure buffers are located in AGP memory that we own */
643 valid = 0;
644 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
645 if ((agp_offset >= agp_entry->bound) &&
646 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
647 valid = 1;
648 break;
649 }
650 }
651 if (!list_empty(&dev->agp->memory) && !valid) {
652 DRM_DEBUG("zone invalid\n");
653 return -EINVAL;
654 }
655 spin_lock(&dev->buf_lock);
656 if (dev->buf_use) {
657 spin_unlock(&dev->buf_lock);
658 return -EBUSY;
659 }
660 atomic_inc(&dev->buf_alloc);
661 spin_unlock(&dev->buf_lock);
662
663 mutex_lock(&dev->struct_mutex);
664 entry = &dma->bufs[order];
665 if (entry->buf_count) {
666 mutex_unlock(&dev->struct_mutex);
667 atomic_dec(&dev->buf_alloc);
668 return -ENOMEM; /* May only call once for each order */
669 }
670
671 if (count < 0 || count > 4096) {
672 mutex_unlock(&dev->struct_mutex);
673 atomic_dec(&dev->buf_alloc);
674 return -EINVAL;
675 }
676
677 entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
678 if (!entry->buflist) {
679 mutex_unlock(&dev->struct_mutex);
680 atomic_dec(&dev->buf_alloc);
681 return -ENOMEM;
682 }
683
684 entry->buf_size = size;
685 entry->page_order = page_order;
686
687 offset = 0;
688
689 while (entry->buf_count < count) {
690 buf = &entry->buflist[entry->buf_count];
691 buf->idx = dma->buf_count + entry->buf_count;
692 buf->total = alignment;
693 buf->order = order;
694 buf->used = 0;
695
696 buf->offset = (dma->byte_count + offset);
697 buf->bus_address = agp_offset + offset;
698 buf->address = (void *)(agp_offset + offset);
699 buf->next = NULL;
700 buf->waiting = 0;
701 buf->pending = 0;
702 buf->file_priv = NULL;
703
704 buf->dev_priv_size = dev->driver->dev_priv_size;
705 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
706 if (!buf->dev_private) {
707 /* Set count correctly so we free the proper amount. */
708 entry->buf_count = count;
709 drm_cleanup_buf_error(dev, entry);
710 mutex_unlock(&dev->struct_mutex);
711 atomic_dec(&dev->buf_alloc);
712 return -ENOMEM;
713 }
714
715 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
716
717 offset += alignment;
718 entry->buf_count++;
719 byte_count += PAGE_SIZE << page_order;
720 }
721
722 DRM_DEBUG("byte_count: %d\n", byte_count);
723
724 temp_buflist = krealloc(dma->buflist,
725 (dma->buf_count + entry->buf_count) *
726 sizeof(*dma->buflist), GFP_KERNEL);
727 if (!temp_buflist) {
728 /* Free the entry because it isn't valid */
729 drm_cleanup_buf_error(dev, entry);
730 mutex_unlock(&dev->struct_mutex);
731 atomic_dec(&dev->buf_alloc);
732 return -ENOMEM;
733 }
734 dma->buflist = temp_buflist;
735
736 for (i = 0; i < entry->buf_count; i++) {
737 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
738 }
739
740 dma->buf_count += entry->buf_count;
741 dma->seg_count += entry->seg_count;
742 dma->page_count += byte_count >> PAGE_SHIFT;
743 dma->byte_count += byte_count;
744
745 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
746 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
747
748 mutex_unlock(&dev->struct_mutex);
749
750 request->count = entry->buf_count;
751 request->size = size;
752
753 dma->flags = _DRM_DMA_USE_AGP;
754
755 atomic_dec(&dev->buf_alloc);
756 return 0;
757 }
758 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
759 #endif /* __OS_HAS_AGP */
760
761 int drm_legacy_addbufs_pci(struct drm_device *dev,
762 struct drm_buf_desc *request)
763 {
764 struct drm_device_dma *dma = dev->dma;
765 int count;
766 int order;
767 int size;
768 int total;
769 int page_order;
770 struct drm_buf_entry *entry;
771 drm_dma_handle_t *dmah;
772 struct drm_buf *buf;
773 int alignment;
774 unsigned long offset;
775 int i;
776 int byte_count;
777 int page_count;
778 unsigned long *temp_pagelist;
779 struct drm_buf **temp_buflist;
780
781 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
782 return -EINVAL;
783
784 if (!dma)
785 return -EINVAL;
786
787 if (!capable(CAP_SYS_ADMIN))
788 return -EPERM;
789
790 count = request->count;
791 order = order_base_2(request->size);
792 size = 1 << order;
793
794 DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
795 request->count, request->size, size, order);
796
797 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
798 return -EINVAL;
799
800 alignment = (request->flags & _DRM_PAGE_ALIGN)
801 ? PAGE_ALIGN(size) : size;
802 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
803 total = PAGE_SIZE << page_order;
804
805 spin_lock(&dev->buf_lock);
806 if (dev->buf_use) {
807 spin_unlock(&dev->buf_lock);
808 return -EBUSY;
809 }
810 atomic_inc(&dev->buf_alloc);
811 spin_unlock(&dev->buf_lock);
812
813 mutex_lock(&dev->struct_mutex);
814 entry = &dma->bufs[order];
815 if (entry->buf_count) {
816 mutex_unlock(&dev->struct_mutex);
817 atomic_dec(&dev->buf_alloc);
818 return -ENOMEM; /* May only call once for each order */
819 }
820
821 if (count < 0 || count > 4096) {
822 mutex_unlock(&dev->struct_mutex);
823 atomic_dec(&dev->buf_alloc);
824 return -EINVAL;
825 }
826
827 entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
828 if (!entry->buflist) {
829 mutex_unlock(&dev->struct_mutex);
830 atomic_dec(&dev->buf_alloc);
831 return -ENOMEM;
832 }
833
834 entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
835 if (!entry->seglist) {
836 kfree(entry->buflist);
837 mutex_unlock(&dev->struct_mutex);
838 atomic_dec(&dev->buf_alloc);
839 return -ENOMEM;
840 }
841
842 /* Keep the original pagelist until we know all the allocations
843 * have succeeded
844 */
845 temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
846 sizeof(*dma->pagelist), GFP_KERNEL);
847 if (!temp_pagelist) {
848 kfree(entry->buflist);
849 kfree(entry->seglist);
850 mutex_unlock(&dev->struct_mutex);
851 atomic_dec(&dev->buf_alloc);
852 return -ENOMEM;
853 }
854 memcpy(temp_pagelist,
855 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
856 DRM_DEBUG("pagelist: %d entries\n",
857 dma->page_count + (count << page_order));
858
859 entry->buf_size = size;
860 entry->page_order = page_order;
861 byte_count = 0;
862 page_count = 0;
863
864 while (entry->buf_count < count) {
865
866 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
867
868 if (!dmah) {
869 /* Set count correctly so we free the proper amount. */
870 entry->buf_count = count;
871 entry->seg_count = count;
872 drm_cleanup_buf_error(dev, entry);
873 kfree(temp_pagelist);
874 mutex_unlock(&dev->struct_mutex);
875 atomic_dec(&dev->buf_alloc);
876 return -ENOMEM;
877 }
878 entry->seglist[entry->seg_count++] = dmah;
879 for (i = 0; i < (1 << page_order); i++) {
880 DRM_DEBUG("page %d @ 0x%08lx\n",
881 dma->page_count + page_count,
882 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
883 temp_pagelist[dma->page_count + page_count++]
884 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
885 }
886 for (offset = 0;
887 offset + size <= total && entry->buf_count < count;
888 offset += alignment, ++entry->buf_count) {
889 buf = &entry->buflist[entry->buf_count];
890 buf->idx = dma->buf_count + entry->buf_count;
891 buf->total = alignment;
892 buf->order = order;
893 buf->used = 0;
894 buf->offset = (dma->byte_count + byte_count + offset);
895 buf->address = (void *)(dmah->vaddr + offset);
896 buf->bus_address = dmah->busaddr + offset;
897 buf->next = NULL;
898 buf->waiting = 0;
899 buf->pending = 0;
900 buf->file_priv = NULL;
901
902 buf->dev_priv_size = dev->driver->dev_priv_size;
903 buf->dev_private = kzalloc(buf->dev_priv_size,
904 GFP_KERNEL);
905 if (!buf->dev_private) {
906 /* Set count correctly so we free the proper amount. */
907 entry->buf_count = count;
908 entry->seg_count = count;
909 drm_cleanup_buf_error(dev, entry);
910 kfree(temp_pagelist);
911 mutex_unlock(&dev->struct_mutex);
912 atomic_dec(&dev->buf_alloc);
913 return -ENOMEM;
914 }
915
916 DRM_DEBUG("buffer %d @ %p\n",
917 entry->buf_count, buf->address);
918 }
919 byte_count += PAGE_SIZE << page_order;
920 }
921
922 temp_buflist = krealloc(dma->buflist,
923 (dma->buf_count + entry->buf_count) *
924 sizeof(*dma->buflist), GFP_KERNEL);
925 if (!temp_buflist) {
926 /* Free the entry because it isn't valid */
927 drm_cleanup_buf_error(dev, entry);
928 kfree(temp_pagelist);
929 mutex_unlock(&dev->struct_mutex);
930 atomic_dec(&dev->buf_alloc);
931 return -ENOMEM;
932 }
933 dma->buflist = temp_buflist;
934
935 for (i = 0; i < entry->buf_count; i++) {
936 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
937 }
938
939 /* No allocations failed, so now we can replace the original pagelist
940 * with the new one.
941 */
942 if (dma->page_count) {
943 kfree(dma->pagelist);
944 }
945 dma->pagelist = temp_pagelist;
946
947 dma->buf_count += entry->buf_count;
948 dma->seg_count += entry->seg_count;
949 dma->page_count += entry->seg_count << page_order;
950 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
951
952 mutex_unlock(&dev->struct_mutex);
953
954 request->count = entry->buf_count;
955 request->size = size;
956
957 if (request->flags & _DRM_PCI_BUFFER_RO)
958 dma->flags = _DRM_DMA_USE_PCI_RO;
959
960 atomic_dec(&dev->buf_alloc);
961 return 0;
962
963 }
964 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
965
966 static int drm_legacy_addbufs_sg(struct drm_device *dev,
967 struct drm_buf_desc *request)
968 {
969 struct drm_device_dma *dma = dev->dma;
970 struct drm_buf_entry *entry;
971 struct drm_buf *buf;
972 unsigned long offset;
973 unsigned long agp_offset;
974 int count;
975 int order;
976 int size;
977 int alignment;
978 int page_order;
979 int total;
980 int byte_count;
981 int i;
982 struct drm_buf **temp_buflist;
983
984 if (!drm_core_check_feature(dev, DRIVER_SG))
985 return -EINVAL;
986
987 if (!dma)
988 return -EINVAL;
989
990 if (!capable(CAP_SYS_ADMIN))
991 return -EPERM;
992
993 count = request->count;
994 order = order_base_2(request->size);
995 size = 1 << order;
996
997 alignment = (request->flags & _DRM_PAGE_ALIGN)
998 ? PAGE_ALIGN(size) : size;
999 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1000 total = PAGE_SIZE << page_order;
1001
1002 byte_count = 0;
1003 agp_offset = request->agp_start;
1004
1005 DRM_DEBUG("count: %d\n", count);
1006 DRM_DEBUG("order: %d\n", order);
1007 DRM_DEBUG("size: %d\n", size);
1008 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1009 DRM_DEBUG("alignment: %d\n", alignment);
1010 DRM_DEBUG("page_order: %d\n", page_order);
1011 DRM_DEBUG("total: %d\n", total);
1012
1013 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1014 return -EINVAL;
1015
1016 spin_lock(&dev->buf_lock);
1017 if (dev->buf_use) {
1018 spin_unlock(&dev->buf_lock);
1019 return -EBUSY;
1020 }
1021 atomic_inc(&dev->buf_alloc);
1022 spin_unlock(&dev->buf_lock);
1023
1024 mutex_lock(&dev->struct_mutex);
1025 entry = &dma->bufs[order];
1026 if (entry->buf_count) {
1027 mutex_unlock(&dev->struct_mutex);
1028 atomic_dec(&dev->buf_alloc);
1029 return -ENOMEM; /* May only call once for each order */
1030 }
1031
1032 if (count < 0 || count > 4096) {
1033 mutex_unlock(&dev->struct_mutex);
1034 atomic_dec(&dev->buf_alloc);
1035 return -EINVAL;
1036 }
1037
1038 entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1039 GFP_KERNEL);
1040 if (!entry->buflist) {
1041 mutex_unlock(&dev->struct_mutex);
1042 atomic_dec(&dev->buf_alloc);
1043 return -ENOMEM;
1044 }
1045
1046 entry->buf_size = size;
1047 entry->page_order = page_order;
1048
1049 offset = 0;
1050
1051 while (entry->buf_count < count) {
1052 buf = &entry->buflist[entry->buf_count];
1053 buf->idx = dma->buf_count + entry->buf_count;
1054 buf->total = alignment;
1055 buf->order = order;
1056 buf->used = 0;
1057
1058 buf->offset = (dma->byte_count + offset);
1059 buf->bus_address = agp_offset + offset;
1060 buf->address = (void *)(agp_offset + offset
1061 + (unsigned long)dev->sg->virtual);
1062 buf->next = NULL;
1063 buf->waiting = 0;
1064 buf->pending = 0;
1065 buf->file_priv = NULL;
1066
1067 buf->dev_priv_size = dev->driver->dev_priv_size;
1068 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1069 if (!buf->dev_private) {
1070 /* Set count correctly so we free the proper amount. */
1071 entry->buf_count = count;
1072 drm_cleanup_buf_error(dev, entry);
1073 mutex_unlock(&dev->struct_mutex);
1074 atomic_dec(&dev->buf_alloc);
1075 return -ENOMEM;
1076 }
1077
1078 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1079
1080 offset += alignment;
1081 entry->buf_count++;
1082 byte_count += PAGE_SIZE << page_order;
1083 }
1084
1085 DRM_DEBUG("byte_count: %d\n", byte_count);
1086
1087 temp_buflist = krealloc(dma->buflist,
1088 (dma->buf_count + entry->buf_count) *
1089 sizeof(*dma->buflist), GFP_KERNEL);
1090 if (!temp_buflist) {
1091 /* Free the entry because it isn't valid */
1092 drm_cleanup_buf_error(dev, entry);
1093 mutex_unlock(&dev->struct_mutex);
1094 atomic_dec(&dev->buf_alloc);
1095 return -ENOMEM;
1096 }
1097 dma->buflist = temp_buflist;
1098
1099 for (i = 0; i < entry->buf_count; i++) {
1100 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1101 }
1102
1103 dma->buf_count += entry->buf_count;
1104 dma->seg_count += entry->seg_count;
1105 dma->page_count += byte_count >> PAGE_SHIFT;
1106 dma->byte_count += byte_count;
1107
1108 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1109 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1110
1111 mutex_unlock(&dev->struct_mutex);
1112
1113 request->count = entry->buf_count;
1114 request->size = size;
1115
1116 dma->flags = _DRM_DMA_USE_SG;
1117
1118 atomic_dec(&dev->buf_alloc);
1119 return 0;
1120 }
1121
1122 /**
1123 * Add buffers for DMA transfers (ioctl).
1124 *
1125 * \param inode device inode.
1126 * \param file_priv DRM file private.
1127 * \param cmd command.
1128 * \param arg pointer to a struct drm_buf_desc request.
1129 * \return zero on success or a negative number on failure.
1130 *
1131 * According with the memory type specified in drm_buf_desc::flags and the
1132 * build options, it dispatches the call either to addbufs_agp(),
1133 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1134 * PCI memory respectively.
1135 */
1136 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1137 struct drm_file *file_priv)
1138 {
1139 struct drm_buf_desc *request = data;
1140 int ret;
1141
1142 if (drm_core_check_feature(dev, DRIVER_MODESET))
1143 return -EINVAL;
1144
1145 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1146 return -EINVAL;
1147
1148 #if __OS_HAS_AGP
1149 if (request->flags & _DRM_AGP_BUFFER)
1150 ret = drm_legacy_addbufs_agp(dev, request);
1151 else
1152 #endif
1153 if (request->flags & _DRM_SG_BUFFER)
1154 ret = drm_legacy_addbufs_sg(dev, request);
1155 else if (request->flags & _DRM_FB_BUFFER)
1156 ret = -EINVAL;
1157 else
1158 ret = drm_legacy_addbufs_pci(dev, request);
1159
1160 return ret;
1161 }
1162
1163 /**
1164 * Get information about the buffer mappings.
1165 *
1166 * This was originally mean for debugging purposes, or by a sophisticated
1167 * client library to determine how best to use the available buffers (e.g.,
1168 * large buffers can be used for image transfer).
1169 *
1170 * \param inode device inode.
1171 * \param file_priv DRM file private.
1172 * \param cmd command.
1173 * \param arg pointer to a drm_buf_info structure.
1174 * \return zero on success or a negative number on failure.
1175 *
1176 * Increments drm_device::buf_use while holding the drm_device::buf_lock
1177 * lock, preventing of allocating more buffers after this call. Information
1178 * about each requested buffer is then copied into user space.
1179 */
1180 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1181 struct drm_file *file_priv)
1182 {
1183 struct drm_device_dma *dma = dev->dma;
1184 struct drm_buf_info *request = data;
1185 int i;
1186 int count;
1187
1188 if (drm_core_check_feature(dev, DRIVER_MODESET))
1189 return -EINVAL;
1190
1191 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1192 return -EINVAL;
1193
1194 if (!dma)
1195 return -EINVAL;
1196
1197 spin_lock(&dev->buf_lock);
1198 if (atomic_read(&dev->buf_alloc)) {
1199 spin_unlock(&dev->buf_lock);
1200 return -EBUSY;
1201 }
1202 ++dev->buf_use; /* Can't allocate more after this call */
1203 spin_unlock(&dev->buf_lock);
1204
1205 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1206 if (dma->bufs[i].buf_count)
1207 ++count;
1208 }
1209
1210 DRM_DEBUG("count = %d\n", count);
1211
1212 if (request->count >= count) {
1213 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1214 if (dma->bufs[i].buf_count) {
1215 struct drm_buf_desc __user *to =
1216 &request->list[count];
1217 struct drm_buf_entry *from = &dma->bufs[i];
1218 if (copy_to_user(&to->count,
1219 &from->buf_count,
1220 sizeof(from->buf_count)) ||
1221 copy_to_user(&to->size,
1222 &from->buf_size,
1223 sizeof(from->buf_size)) ||
1224 copy_to_user(&to->low_mark,
1225 &from->low_mark,
1226 sizeof(from->low_mark)) ||
1227 copy_to_user(&to->high_mark,
1228 &from->high_mark,
1229 sizeof(from->high_mark)))
1230 return -EFAULT;
1231
1232 DRM_DEBUG("%d %d %d %d %d\n",
1233 i,
1234 dma->bufs[i].buf_count,
1235 dma->bufs[i].buf_size,
1236 dma->bufs[i].low_mark,
1237 dma->bufs[i].high_mark);
1238 ++count;
1239 }
1240 }
1241 }
1242 request->count = count;
1243
1244 return 0;
1245 }
1246
1247 /**
1248 * Specifies a low and high water mark for buffer allocation
1249 *
1250 * \param inode device inode.
1251 * \param file_priv DRM file private.
1252 * \param cmd command.
1253 * \param arg a pointer to a drm_buf_desc structure.
1254 * \return zero on success or a negative number on failure.
1255 *
1256 * Verifies that the size order is bounded between the admissible orders and
1257 * updates the respective drm_device_dma::bufs entry low and high water mark.
1258 *
1259 * \note This ioctl is deprecated and mostly never used.
1260 */
1261 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1262 struct drm_file *file_priv)
1263 {
1264 struct drm_device_dma *dma = dev->dma;
1265 struct drm_buf_desc *request = data;
1266 int order;
1267 struct drm_buf_entry *entry;
1268
1269 if (drm_core_check_feature(dev, DRIVER_MODESET))
1270 return -EINVAL;
1271
1272 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1273 return -EINVAL;
1274
1275 if (!dma)
1276 return -EINVAL;
1277
1278 DRM_DEBUG("%d, %d, %d\n",
1279 request->size, request->low_mark, request->high_mark);
1280 order = order_base_2(request->size);
1281 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1282 return -EINVAL;
1283 entry = &dma->bufs[order];
1284
1285 if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1286 return -EINVAL;
1287 if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1288 return -EINVAL;
1289
1290 entry->low_mark = request->low_mark;
1291 entry->high_mark = request->high_mark;
1292
1293 return 0;
1294 }
1295
1296 /**
1297 * Unreserve the buffers in list, previously reserved using drmDMA.
1298 *
1299 * \param inode device inode.
1300 * \param file_priv DRM file private.
1301 * \param cmd command.
1302 * \param arg pointer to a drm_buf_free structure.
1303 * \return zero on success or a negative number on failure.
1304 *
1305 * Calls free_buffer() for each used buffer.
1306 * This function is primarily used for debugging.
1307 */
1308 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1309 struct drm_file *file_priv)
1310 {
1311 struct drm_device_dma *dma = dev->dma;
1312 struct drm_buf_free *request = data;
1313 int i;
1314 int idx;
1315 struct drm_buf *buf;
1316
1317 if (drm_core_check_feature(dev, DRIVER_MODESET))
1318 return -EINVAL;
1319
1320 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1321 return -EINVAL;
1322
1323 if (!dma)
1324 return -EINVAL;
1325
1326 DRM_DEBUG("%d\n", request->count);
1327 for (i = 0; i < request->count; i++) {
1328 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1329 return -EFAULT;
1330 if (idx < 0 || idx >= dma->buf_count) {
1331 DRM_ERROR("Index %d (of %d max)\n",
1332 idx, dma->buf_count - 1);
1333 return -EINVAL;
1334 }
1335 buf = dma->buflist[idx];
1336 if (buf->file_priv != file_priv) {
1337 DRM_ERROR("Process %d freeing buffer not owned\n",
1338 task_pid_nr(current));
1339 return -EINVAL;
1340 }
1341 drm_legacy_free_buffer(dev, buf);
1342 }
1343
1344 return 0;
1345 }
1346
1347 /**
1348 * Maps all of the DMA buffers into client-virtual space (ioctl).
1349 *
1350 * \param inode device inode.
1351 * \param file_priv DRM file private.
1352 * \param cmd command.
1353 * \param arg pointer to a drm_buf_map structure.
1354 * \return zero on success or a negative number on failure.
1355 *
1356 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1357 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1358 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1359 * drm_mmap_dma().
1360 */
1361 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1362 struct drm_file *file_priv)
1363 {
1364 struct drm_device_dma *dma = dev->dma;
1365 int retcode = 0;
1366 const int zero = 0;
1367 unsigned long virtual;
1368 unsigned long address;
1369 struct drm_buf_map *request = data;
1370 int i;
1371
1372 if (drm_core_check_feature(dev, DRIVER_MODESET))
1373 return -EINVAL;
1374
1375 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1376 return -EINVAL;
1377
1378 if (!dma)
1379 return -EINVAL;
1380
1381 spin_lock(&dev->buf_lock);
1382 if (atomic_read(&dev->buf_alloc)) {
1383 spin_unlock(&dev->buf_lock);
1384 return -EBUSY;
1385 }
1386 dev->buf_use++; /* Can't allocate more after this call */
1387 spin_unlock(&dev->buf_lock);
1388
1389 if (request->count >= dma->buf_count) {
1390 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1391 || (drm_core_check_feature(dev, DRIVER_SG)
1392 && (dma->flags & _DRM_DMA_USE_SG))) {
1393 struct drm_local_map *map = dev->agp_buffer_map;
1394 unsigned long token = dev->agp_buffer_token;
1395
1396 if (!map) {
1397 retcode = -EINVAL;
1398 goto done;
1399 }
1400 virtual = vm_mmap(file_priv->filp, 0, map->size,
1401 PROT_READ | PROT_WRITE,
1402 MAP_SHARED,
1403 token);
1404 } else {
1405 virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1406 PROT_READ | PROT_WRITE,
1407 MAP_SHARED, 0);
1408 }
1409 if (virtual > -1024UL) {
1410 /* Real error */
1411 retcode = (signed long)virtual;
1412 goto done;
1413 }
1414 request->virtual = (void __user *)virtual;
1415
1416 for (i = 0; i < dma->buf_count; i++) {
1417 if (copy_to_user(&request->list[i].idx,
1418 &dma->buflist[i]->idx,
1419 sizeof(request->list[0].idx))) {
1420 retcode = -EFAULT;
1421 goto done;
1422 }
1423 if (copy_to_user(&request->list[i].total,
1424 &dma->buflist[i]->total,
1425 sizeof(request->list[0].total))) {
1426 retcode = -EFAULT;
1427 goto done;
1428 }
1429 if (copy_to_user(&request->list[i].used,
1430 &zero, sizeof(zero))) {
1431 retcode = -EFAULT;
1432 goto done;
1433 }
1434 address = virtual + dma->buflist[i]->offset; /* *** */
1435 if (copy_to_user(&request->list[i].address,
1436 &address, sizeof(address))) {
1437 retcode = -EFAULT;
1438 goto done;
1439 }
1440 }
1441 }
1442 done:
1443 request->count = dma->buf_count;
1444 DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1445
1446 return retcode;
1447 }
1448
1449 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1450 struct drm_file *file_priv)
1451 {
1452 if (drm_core_check_feature(dev, DRIVER_MODESET))
1453 return -EINVAL;
1454
1455 if (dev->driver->dma_ioctl)
1456 return dev->driver->dma_ioctl(dev, data, file_priv);
1457 else
1458 return -EINVAL;
1459 }
1460
1461 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1462 {
1463 struct drm_map_list *entry;
1464
1465 list_for_each_entry(entry, &dev->maplist, head) {
1466 if (entry->map && entry->map->type == _DRM_SHM &&
1467 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1468 return entry->map;
1469 }
1470 }
1471 return NULL;
1472 }
1473 EXPORT_SYMBOL(drm_legacy_getsarea);
Linux with added FPC-III support