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Merge ARM fixes
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / 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(drm_device_t *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(drm_device_t *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 drm_map_list_t *drm_find_matching_map(drm_device_t *dev,
53 drm_local_map_t *map)
54 {
55 struct list_head *list;
56
57 list_for_each(list, &dev->maplist->head) {
58 drm_map_list_t *entry = list_entry(list, drm_map_list_t, head);
59 if (entry->map && map->type == entry->map->type &&
60 entry->map->offset == map->offset) {
61 return entry;
62 }
63 }
64
65 return NULL;
66 }
67
68 static int drm_map_handle(drm_device_t *dev, drm_hash_item_t *hash,
69 unsigned long user_token, int hashed_handle)
70 {
71 int use_hashed_handle;
72 #if (BITS_PER_LONG == 64)
73 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
74 #elif (BITS_PER_LONG == 32)
75 use_hashed_handle = hashed_handle;
76 #else
77 #error Unsupported long size. Neither 64 nor 32 bits.
78 #endif
79
80 if (!use_hashed_handle) {
81 int ret;
82 hash->key = user_token >> PAGE_SHIFT;
83 ret = drm_ht_insert_item(&dev->map_hash, hash);
84 if (ret != -EINVAL)
85 return ret;
86 }
87 return drm_ht_just_insert_please(&dev->map_hash, hash,
88 user_token, 32 - PAGE_SHIFT - 3,
89 0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT);
90 }
91
92 /**
93 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
94 *
95 * \param inode device inode.
96 * \param filp file pointer.
97 * \param cmd command.
98 * \param arg pointer to a drm_map structure.
99 * \return zero on success or a negative value on error.
100 *
101 * Adjusts the memory offset to its absolute value according to the mapping
102 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
103 * applicable and if supported by the kernel.
104 */
105 static int drm_addmap_core(drm_device_t * dev, unsigned int offset,
106 unsigned int size, drm_map_type_t type,
107 drm_map_flags_t flags, drm_map_list_t ** maplist)
108 {
109 drm_map_t *map;
110 drm_map_list_t *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 break;
183
184 case _DRM_SHM:
185 map->handle = vmalloc_user(map->size);
186 DRM_DEBUG("%lu %d %p\n",
187 map->size, drm_order(map->size), map->handle);
188 if (!map->handle) {
189 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
190 return -ENOMEM;
191 }
192 map->offset = (unsigned long)map->handle;
193 if (map->flags & _DRM_CONTAINS_LOCK) {
194 /* Prevent a 2nd X Server from creating a 2nd lock */
195 if (dev->lock.hw_lock != NULL) {
196 vfree(map->handle);
197 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
198 return -EBUSY;
199 }
200 dev->sigdata.lock = dev->lock.hw_lock = map->handle; /* Pointer to lock */
201 }
202 break;
203 case _DRM_AGP:
204 if (drm_core_has_AGP(dev)) {
205 #ifdef __alpha__
206 map->offset += dev->hose->mem_space->start;
207 #endif
208 map->offset += dev->agp->base;
209 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
210 }
211 break;
212 case _DRM_SCATTER_GATHER:
213 if (!dev->sg) {
214 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
215 return -EINVAL;
216 }
217 map->offset += (unsigned long)dev->sg->virtual;
218 break;
219 case _DRM_CONSISTENT:
220 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
221 * As we're limiting the address to 2^32-1 (or less),
222 * casting it down to 32 bits is no problem, but we
223 * need to point to a 64bit variable first. */
224 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
225 if (!dmah) {
226 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
227 return -ENOMEM;
228 }
229 map->handle = dmah->vaddr;
230 map->offset = (unsigned long)dmah->busaddr;
231 kfree(dmah);
232 break;
233 default:
234 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
235 return -EINVAL;
236 }
237
238 list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
239 if (!list) {
240 if (map->type == _DRM_REGISTERS)
241 iounmap(map->handle);
242 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
243 return -EINVAL;
244 }
245 memset(list, 0, sizeof(*list));
246 list->map = map;
247
248 mutex_lock(&dev->struct_mutex);
249 list_add(&list->head, &dev->maplist->head);
250
251 /* Assign a 32-bit handle */
252 /* We do it here so that dev->struct_mutex protects the increment */
253 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
254 map->offset;
255 ret = drm_map_handle(dev, &list->hash, user_token, 0);
256 if (ret) {
257 if (map->type == _DRM_REGISTERS)
258 iounmap(map->handle);
259 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
260 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
261 mutex_unlock(&dev->struct_mutex);
262 return ret;
263 }
264
265 list->user_token = list->hash.key << PAGE_SHIFT;
266 mutex_unlock(&dev->struct_mutex);
267
268 *maplist = list;
269 return 0;
270 }
271
272 int drm_addmap(drm_device_t * dev, unsigned int offset,
273 unsigned int size, drm_map_type_t type,
274 drm_map_flags_t flags, drm_local_map_t ** map_ptr)
275 {
276 drm_map_list_t *list;
277 int rc;
278
279 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
280 if (!rc)
281 *map_ptr = list->map;
282 return rc;
283 }
284
285 EXPORT_SYMBOL(drm_addmap);
286
287 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
288 unsigned int cmd, unsigned long arg)
289 {
290 drm_file_t *priv = filp->private_data;
291 drm_device_t *dev = priv->head->dev;
292 drm_map_t map;
293 drm_map_list_t *maplist;
294 drm_map_t __user *argp = (void __user *)arg;
295 int err;
296
297 if (!(filp->f_mode & 3))
298 return -EACCES; /* Require read/write */
299
300 if (copy_from_user(&map, argp, sizeof(map))) {
301 return -EFAULT;
302 }
303
304 if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
305 return -EPERM;
306
307 err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
308 &maplist);
309
310 if (err)
311 return err;
312
313 if (copy_to_user(argp, maplist->map, sizeof(drm_map_t)))
314 return -EFAULT;
315
316 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
317 if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
318 return -EFAULT;
319 return 0;
320 }
321
322 /**
323 * Remove a map private from list and deallocate resources if the mapping
324 * isn't in use.
325 *
326 * \param inode device inode.
327 * \param filp file pointer.
328 * \param cmd command.
329 * \param arg pointer to a drm_map_t structure.
330 * \return zero on success or a negative value on error.
331 *
332 * Searches the map on drm_device::maplist, removes it from the list, see if
333 * its being used, and free any associate resource (such as MTRR's) if it's not
334 * being on use.
335 *
336 * \sa drm_addmap
337 */
338 int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
339 {
340 struct list_head *list;
341 drm_map_list_t *r_list = NULL;
342 drm_dma_handle_t dmah;
343
344 /* Find the list entry for the map and remove it */
345 list_for_each(list, &dev->maplist->head) {
346 r_list = list_entry(list, drm_map_list_t, head);
347
348 if (r_list->map == map) {
349 list_del(list);
350 drm_ht_remove_key(&dev->map_hash,
351 r_list->user_token >> PAGE_SHIFT);
352 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
353 break;
354 }
355 }
356
357 /* List has wrapped around to the head pointer, or it's empty and we
358 * didn't find anything.
359 */
360 if (list == (&dev->maplist->head)) {
361 return -EINVAL;
362 }
363
364 switch (map->type) {
365 case _DRM_REGISTERS:
366 iounmap(map->handle);
367 /* FALLTHROUGH */
368 case _DRM_FRAME_BUFFER:
369 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
370 int retcode;
371 retcode = mtrr_del(map->mtrr, map->offset, map->size);
372 DRM_DEBUG("mtrr_del=%d\n", retcode);
373 }
374 break;
375 case _DRM_SHM:
376 vfree(map->handle);
377 break;
378 case _DRM_AGP:
379 case _DRM_SCATTER_GATHER:
380 break;
381 case _DRM_CONSISTENT:
382 dmah.vaddr = map->handle;
383 dmah.busaddr = map->offset;
384 dmah.size = map->size;
385 __drm_pci_free(dev, &dmah);
386 break;
387 }
388 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
389
390 return 0;
391 }
392
393 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
394 {
395 int ret;
396
397 mutex_lock(&dev->struct_mutex);
398 ret = drm_rmmap_locked(dev, map);
399 mutex_unlock(&dev->struct_mutex);
400
401 return ret;
402 }
403
404 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
405 * the last close of the device, and this is necessary for cleanup when things
406 * exit uncleanly. Therefore, having userland manually remove mappings seems
407 * like a pointless exercise since they're going away anyway.
408 *
409 * One use case might be after addmap is allowed for normal users for SHM and
410 * gets used by drivers that the server doesn't need to care about. This seems
411 * unlikely.
412 */
413 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
414 unsigned int cmd, unsigned long arg)
415 {
416 drm_file_t *priv = filp->private_data;
417 drm_device_t *dev = priv->head->dev;
418 drm_map_t request;
419 drm_local_map_t *map = NULL;
420 struct list_head *list;
421 int ret;
422
423 if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
424 return -EFAULT;
425 }
426
427 mutex_lock(&dev->struct_mutex);
428 list_for_each(list, &dev->maplist->head) {
429 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
430
431 if (r_list->map &&
432 r_list->user_token == (unsigned long)request.handle &&
433 r_list->map->flags & _DRM_REMOVABLE) {
434 map = r_list->map;
435 break;
436 }
437 }
438
439 /* List has wrapped around to the head pointer, or its empty we didn't
440 * find anything.
441 */
442 if (list == (&dev->maplist->head)) {
443 mutex_unlock(&dev->struct_mutex);
444 return -EINVAL;
445 }
446
447 if (!map) {
448 mutex_unlock(&dev->struct_mutex);
449 return -EINVAL;
450 }
451
452 /* Register and framebuffer maps are permanent */
453 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
454 mutex_unlock(&dev->struct_mutex);
455 return 0;
456 }
457
458 ret = drm_rmmap_locked(dev, map);
459
460 mutex_unlock(&dev->struct_mutex);
461
462 return ret;
463 }
464
465 /**
466 * Cleanup after an error on one of the addbufs() functions.
467 *
468 * \param dev DRM device.
469 * \param entry buffer entry where the error occurred.
470 *
471 * Frees any pages and buffers associated with the given entry.
472 */
473 static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
474 {
475 int i;
476
477 if (entry->seg_count) {
478 for (i = 0; i < entry->seg_count; i++) {
479 if (entry->seglist[i]) {
480 drm_pci_free(dev, entry->seglist[i]);
481 }
482 }
483 drm_free(entry->seglist,
484 entry->seg_count *
485 sizeof(*entry->seglist), DRM_MEM_SEGS);
486
487 entry->seg_count = 0;
488 }
489
490 if (entry->buf_count) {
491 for (i = 0; i < entry->buf_count; i++) {
492 if (entry->buflist[i].dev_private) {
493 drm_free(entry->buflist[i].dev_private,
494 entry->buflist[i].dev_priv_size,
495 DRM_MEM_BUFS);
496 }
497 }
498 drm_free(entry->buflist,
499 entry->buf_count *
500 sizeof(*entry->buflist), DRM_MEM_BUFS);
501
502 entry->buf_count = 0;
503 }
504 }
505
506 #if __OS_HAS_AGP
507 /**
508 * Add AGP buffers for DMA transfers.
509 *
510 * \param dev drm_device_t to which the buffers are to be added.
511 * \param request pointer to a drm_buf_desc_t describing the request.
512 * \return zero on success or a negative number on failure.
513 *
514 * After some sanity checks creates a drm_buf structure for each buffer and
515 * reallocates the buffer list of the same size order to accommodate the new
516 * buffers.
517 */
518 int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
519 {
520 drm_device_dma_t *dma = dev->dma;
521 drm_buf_entry_t *entry;
522 drm_buf_t *buf;
523 unsigned long offset;
524 unsigned long agp_offset;
525 int count;
526 int order;
527 int size;
528 int alignment;
529 int page_order;
530 int total;
531 int byte_count;
532 int i;
533 drm_buf_t **temp_buflist;
534
535 if (!dma)
536 return -EINVAL;
537
538 count = request->count;
539 order = drm_order(request->size);
540 size = 1 << order;
541
542 alignment = (request->flags & _DRM_PAGE_ALIGN)
543 ? PAGE_ALIGN(size) : size;
544 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
545 total = PAGE_SIZE << page_order;
546
547 byte_count = 0;
548 agp_offset = dev->agp->base + request->agp_start;
549
550 DRM_DEBUG("count: %d\n", count);
551 DRM_DEBUG("order: %d\n", order);
552 DRM_DEBUG("size: %d\n", size);
553 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
554 DRM_DEBUG("alignment: %d\n", alignment);
555 DRM_DEBUG("page_order: %d\n", page_order);
556 DRM_DEBUG("total: %d\n", total);
557
558 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
559 return -EINVAL;
560 if (dev->queue_count)
561 return -EBUSY; /* Not while in use */
562
563 spin_lock(&dev->count_lock);
564 if (dev->buf_use) {
565 spin_unlock(&dev->count_lock);
566 return -EBUSY;
567 }
568 atomic_inc(&dev->buf_alloc);
569 spin_unlock(&dev->count_lock);
570
571 mutex_lock(&dev->struct_mutex);
572 entry = &dma->bufs[order];
573 if (entry->buf_count) {
574 mutex_unlock(&dev->struct_mutex);
575 atomic_dec(&dev->buf_alloc);
576 return -ENOMEM; /* May only call once for each order */
577 }
578
579 if (count < 0 || count > 4096) {
580 mutex_unlock(&dev->struct_mutex);
581 atomic_dec(&dev->buf_alloc);
582 return -EINVAL;
583 }
584
585 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
586 DRM_MEM_BUFS);
587 if (!entry->buflist) {
588 mutex_unlock(&dev->struct_mutex);
589 atomic_dec(&dev->buf_alloc);
590 return -ENOMEM;
591 }
592 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
593
594 entry->buf_size = size;
595 entry->page_order = page_order;
596
597 offset = 0;
598
599 while (entry->buf_count < count) {
600 buf = &entry->buflist[entry->buf_count];
601 buf->idx = dma->buf_count + entry->buf_count;
602 buf->total = alignment;
603 buf->order = order;
604 buf->used = 0;
605
606 buf->offset = (dma->byte_count + offset);
607 buf->bus_address = agp_offset + offset;
608 buf->address = (void *)(agp_offset + offset);
609 buf->next = NULL;
610 buf->waiting = 0;
611 buf->pending = 0;
612 init_waitqueue_head(&buf->dma_wait);
613 buf->filp = NULL;
614
615 buf->dev_priv_size = dev->driver->dev_priv_size;
616 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
617 if (!buf->dev_private) {
618 /* Set count correctly so we free the proper amount. */
619 entry->buf_count = count;
620 drm_cleanup_buf_error(dev, entry);
621 mutex_unlock(&dev->struct_mutex);
622 atomic_dec(&dev->buf_alloc);
623 return -ENOMEM;
624 }
625 memset(buf->dev_private, 0, buf->dev_priv_size);
626
627 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
628
629 offset += alignment;
630 entry->buf_count++;
631 byte_count += PAGE_SIZE << page_order;
632 }
633
634 DRM_DEBUG("byte_count: %d\n", byte_count);
635
636 temp_buflist = drm_realloc(dma->buflist,
637 dma->buf_count * sizeof(*dma->buflist),
638 (dma->buf_count + entry->buf_count)
639 * sizeof(*dma->buflist), DRM_MEM_BUFS);
640 if (!temp_buflist) {
641 /* Free the entry because it isn't valid */
642 drm_cleanup_buf_error(dev, entry);
643 mutex_unlock(&dev->struct_mutex);
644 atomic_dec(&dev->buf_alloc);
645 return -ENOMEM;
646 }
647 dma->buflist = temp_buflist;
648
649 for (i = 0; i < entry->buf_count; i++) {
650 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
651 }
652
653 dma->buf_count += entry->buf_count;
654 dma->seg_count += entry->seg_count;
655 dma->page_count += byte_count >> PAGE_SHIFT;
656 dma->byte_count += byte_count;
657
658 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
659 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
660
661 mutex_unlock(&dev->struct_mutex);
662
663 request->count = entry->buf_count;
664 request->size = size;
665
666 dma->flags = _DRM_DMA_USE_AGP;
667
668 atomic_dec(&dev->buf_alloc);
669 return 0;
670 }
671 EXPORT_SYMBOL(drm_addbufs_agp);
672 #endif /* __OS_HAS_AGP */
673
674 int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
675 {
676 drm_device_dma_t *dma = dev->dma;
677 int count;
678 int order;
679 int size;
680 int total;
681 int page_order;
682 drm_buf_entry_t *entry;
683 drm_dma_handle_t *dmah;
684 drm_buf_t *buf;
685 int alignment;
686 unsigned long offset;
687 int i;
688 int byte_count;
689 int page_count;
690 unsigned long *temp_pagelist;
691 drm_buf_t **temp_buflist;
692
693 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
694 return -EINVAL;
695
696 if (!dma)
697 return -EINVAL;
698
699 if (!capable(CAP_SYS_ADMIN))
700 return -EPERM;
701
702 count = request->count;
703 order = drm_order(request->size);
704 size = 1 << order;
705
706 DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
707 request->count, request->size, size, order, dev->queue_count);
708
709 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
710 return -EINVAL;
711 if (dev->queue_count)
712 return -EBUSY; /* Not while in use */
713
714 alignment = (request->flags & _DRM_PAGE_ALIGN)
715 ? PAGE_ALIGN(size) : size;
716 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
717 total = PAGE_SIZE << page_order;
718
719 spin_lock(&dev->count_lock);
720 if (dev->buf_use) {
721 spin_unlock(&dev->count_lock);
722 return -EBUSY;
723 }
724 atomic_inc(&dev->buf_alloc);
725 spin_unlock(&dev->count_lock);
726
727 mutex_lock(&dev->struct_mutex);
728 entry = &dma->bufs[order];
729 if (entry->buf_count) {
730 mutex_unlock(&dev->struct_mutex);
731 atomic_dec(&dev->buf_alloc);
732 return -ENOMEM; /* May only call once for each order */
733 }
734
735 if (count < 0 || count > 4096) {
736 mutex_unlock(&dev->struct_mutex);
737 atomic_dec(&dev->buf_alloc);
738 return -EINVAL;
739 }
740
741 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
742 DRM_MEM_BUFS);
743 if (!entry->buflist) {
744 mutex_unlock(&dev->struct_mutex);
745 atomic_dec(&dev->buf_alloc);
746 return -ENOMEM;
747 }
748 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
749
750 entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
751 DRM_MEM_SEGS);
752 if (!entry->seglist) {
753 drm_free(entry->buflist,
754 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
755 mutex_unlock(&dev->struct_mutex);
756 atomic_dec(&dev->buf_alloc);
757 return -ENOMEM;
758 }
759 memset(entry->seglist, 0, count * sizeof(*entry->seglist));
760
761 /* Keep the original pagelist until we know all the allocations
762 * have succeeded
763 */
764 temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
765 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
766 if (!temp_pagelist) {
767 drm_free(entry->buflist,
768 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
769 drm_free(entry->seglist,
770 count * sizeof(*entry->seglist), DRM_MEM_SEGS);
771 mutex_unlock(&dev->struct_mutex);
772 atomic_dec(&dev->buf_alloc);
773 return -ENOMEM;
774 }
775 memcpy(temp_pagelist,
776 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
777 DRM_DEBUG("pagelist: %d entries\n",
778 dma->page_count + (count << page_order));
779
780 entry->buf_size = size;
781 entry->page_order = page_order;
782 byte_count = 0;
783 page_count = 0;
784
785 while (entry->buf_count < count) {
786
787 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
788
789 if (!dmah) {
790 /* Set count correctly so we free the proper amount. */
791 entry->buf_count = count;
792 entry->seg_count = count;
793 drm_cleanup_buf_error(dev, entry);
794 drm_free(temp_pagelist,
795 (dma->page_count + (count << page_order))
796 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
797 mutex_unlock(&dev->struct_mutex);
798 atomic_dec(&dev->buf_alloc);
799 return -ENOMEM;
800 }
801 entry->seglist[entry->seg_count++] = dmah;
802 for (i = 0; i < (1 << page_order); i++) {
803 DRM_DEBUG("page %d @ 0x%08lx\n",
804 dma->page_count + page_count,
805 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
806 temp_pagelist[dma->page_count + page_count++]
807 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
808 }
809 for (offset = 0;
810 offset + size <= total && entry->buf_count < count;
811 offset += alignment, ++entry->buf_count) {
812 buf = &entry->buflist[entry->buf_count];
813 buf->idx = dma->buf_count + entry->buf_count;
814 buf->total = alignment;
815 buf->order = order;
816 buf->used = 0;
817 buf->offset = (dma->byte_count + byte_count + offset);
818 buf->address = (void *)(dmah->vaddr + offset);
819 buf->bus_address = dmah->busaddr + offset;
820 buf->next = NULL;
821 buf->waiting = 0;
822 buf->pending = 0;
823 init_waitqueue_head(&buf->dma_wait);
824 buf->filp = NULL;
825
826 buf->dev_priv_size = dev->driver->dev_priv_size;
827 buf->dev_private = drm_alloc(buf->dev_priv_size,
828 DRM_MEM_BUFS);
829 if (!buf->dev_private) {
830 /* Set count correctly so we free the proper amount. */
831 entry->buf_count = count;
832 entry->seg_count = count;
833 drm_cleanup_buf_error(dev, entry);
834 drm_free(temp_pagelist,
835 (dma->page_count +
836 (count << page_order))
837 * sizeof(*dma->pagelist),
838 DRM_MEM_PAGES);
839 mutex_unlock(&dev->struct_mutex);
840 atomic_dec(&dev->buf_alloc);
841 return -ENOMEM;
842 }
843 memset(buf->dev_private, 0, buf->dev_priv_size);
844
845 DRM_DEBUG("buffer %d @ %p\n",
846 entry->buf_count, buf->address);
847 }
848 byte_count += PAGE_SIZE << page_order;
849 }
850
851 temp_buflist = drm_realloc(dma->buflist,
852 dma->buf_count * sizeof(*dma->buflist),
853 (dma->buf_count + entry->buf_count)
854 * sizeof(*dma->buflist), DRM_MEM_BUFS);
855 if (!temp_buflist) {
856 /* Free the entry because it isn't valid */
857 drm_cleanup_buf_error(dev, entry);
858 drm_free(temp_pagelist,
859 (dma->page_count + (count << page_order))
860 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
861 mutex_unlock(&dev->struct_mutex);
862 atomic_dec(&dev->buf_alloc);
863 return -ENOMEM;
864 }
865 dma->buflist = temp_buflist;
866
867 for (i = 0; i < entry->buf_count; i++) {
868 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
869 }
870
871 /* No allocations failed, so now we can replace the orginal pagelist
872 * with the new one.
873 */
874 if (dma->page_count) {
875 drm_free(dma->pagelist,
876 dma->page_count * sizeof(*dma->pagelist),
877 DRM_MEM_PAGES);
878 }
879 dma->pagelist = temp_pagelist;
880
881 dma->buf_count += entry->buf_count;
882 dma->seg_count += entry->seg_count;
883 dma->page_count += entry->seg_count << page_order;
884 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
885
886 mutex_unlock(&dev->struct_mutex);
887
888 request->count = entry->buf_count;
889 request->size = size;
890
891 if (request->flags & _DRM_PCI_BUFFER_RO)
892 dma->flags = _DRM_DMA_USE_PCI_RO;
893
894 atomic_dec(&dev->buf_alloc);
895 return 0;
896
897 }
898 EXPORT_SYMBOL(drm_addbufs_pci);
899
900 static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
901 {
902 drm_device_dma_t *dma = dev->dma;
903 drm_buf_entry_t *entry;
904 drm_buf_t *buf;
905 unsigned long offset;
906 unsigned long agp_offset;
907 int count;
908 int order;
909 int size;
910 int alignment;
911 int page_order;
912 int total;
913 int byte_count;
914 int i;
915 drm_buf_t **temp_buflist;
916
917 if (!drm_core_check_feature(dev, DRIVER_SG))
918 return -EINVAL;
919
920 if (!dma)
921 return -EINVAL;
922
923 if (!capable(CAP_SYS_ADMIN))
924 return -EPERM;
925
926 count = request->count;
927 order = drm_order(request->size);
928 size = 1 << order;
929
930 alignment = (request->flags & _DRM_PAGE_ALIGN)
931 ? PAGE_ALIGN(size) : size;
932 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
933 total = PAGE_SIZE << page_order;
934
935 byte_count = 0;
936 agp_offset = request->agp_start;
937
938 DRM_DEBUG("count: %d\n", count);
939 DRM_DEBUG("order: %d\n", order);
940 DRM_DEBUG("size: %d\n", size);
941 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
942 DRM_DEBUG("alignment: %d\n", alignment);
943 DRM_DEBUG("page_order: %d\n", page_order);
944 DRM_DEBUG("total: %d\n", total);
945
946 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
947 return -EINVAL;
948 if (dev->queue_count)
949 return -EBUSY; /* Not while in use */
950
951 spin_lock(&dev->count_lock);
952 if (dev->buf_use) {
953 spin_unlock(&dev->count_lock);
954 return -EBUSY;
955 }
956 atomic_inc(&dev->buf_alloc);
957 spin_unlock(&dev->count_lock);
958
959 mutex_lock(&dev->struct_mutex);
960 entry = &dma->bufs[order];
961 if (entry->buf_count) {
962 mutex_unlock(&dev->struct_mutex);
963 atomic_dec(&dev->buf_alloc);
964 return -ENOMEM; /* May only call once for each order */
965 }
966
967 if (count < 0 || count > 4096) {
968 mutex_unlock(&dev->struct_mutex);
969 atomic_dec(&dev->buf_alloc);
970 return -EINVAL;
971 }
972
973 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
974 DRM_MEM_BUFS);
975 if (!entry->buflist) {
976 mutex_unlock(&dev->struct_mutex);
977 atomic_dec(&dev->buf_alloc);
978 return -ENOMEM;
979 }
980 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
981
982 entry->buf_size = size;
983 entry->page_order = page_order;
984
985 offset = 0;
986
987 while (entry->buf_count < count) {
988 buf = &entry->buflist[entry->buf_count];
989 buf->idx = dma->buf_count + entry->buf_count;
990 buf->total = alignment;
991 buf->order = order;
992 buf->used = 0;
993
994 buf->offset = (dma->byte_count + offset);
995 buf->bus_address = agp_offset + offset;
996 buf->address = (void *)(agp_offset + offset
997 + (unsigned long)dev->sg->virtual);
998 buf->next = NULL;
999 buf->waiting = 0;
1000 buf->pending = 0;
1001 init_waitqueue_head(&buf->dma_wait);
1002 buf->filp = NULL;
1003
1004 buf->dev_priv_size = dev->driver->dev_priv_size;
1005 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1006 if (!buf->dev_private) {
1007 /* Set count correctly so we free the proper amount. */
1008 entry->buf_count = count;
1009 drm_cleanup_buf_error(dev, entry);
1010 mutex_unlock(&dev->struct_mutex);
1011 atomic_dec(&dev->buf_alloc);
1012 return -ENOMEM;
1013 }
1014
1015 memset(buf->dev_private, 0, buf->dev_priv_size);
1016
1017 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1018
1019 offset += alignment;
1020 entry->buf_count++;
1021 byte_count += PAGE_SIZE << page_order;
1022 }
1023
1024 DRM_DEBUG("byte_count: %d\n", byte_count);
1025
1026 temp_buflist = drm_realloc(dma->buflist,
1027 dma->buf_count * sizeof(*dma->buflist),
1028 (dma->buf_count + entry->buf_count)
1029 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1030 if (!temp_buflist) {
1031 /* Free the entry because it isn't valid */
1032 drm_cleanup_buf_error(dev, entry);
1033 mutex_unlock(&dev->struct_mutex);
1034 atomic_dec(&dev->buf_alloc);
1035 return -ENOMEM;
1036 }
1037 dma->buflist = temp_buflist;
1038
1039 for (i = 0; i < entry->buf_count; i++) {
1040 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1041 }
1042
1043 dma->buf_count += entry->buf_count;
1044 dma->seg_count += entry->seg_count;
1045 dma->page_count += byte_count >> PAGE_SHIFT;
1046 dma->byte_count += byte_count;
1047
1048 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1049 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1050
1051 mutex_unlock(&dev->struct_mutex);
1052
1053 request->count = entry->buf_count;
1054 request->size = size;
1055
1056 dma->flags = _DRM_DMA_USE_SG;
1057
1058 atomic_dec(&dev->buf_alloc);
1059 return 0;
1060 }
1061
1062 static int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
1063 {
1064 drm_device_dma_t *dma = dev->dma;
1065 drm_buf_entry_t *entry;
1066 drm_buf_t *buf;
1067 unsigned long offset;
1068 unsigned long agp_offset;
1069 int count;
1070 int order;
1071 int size;
1072 int alignment;
1073 int page_order;
1074 int total;
1075 int byte_count;
1076 int i;
1077 drm_buf_t **temp_buflist;
1078
1079 if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1080 return -EINVAL;
1081
1082 if (!dma)
1083 return -EINVAL;
1084
1085 if (!capable(CAP_SYS_ADMIN))
1086 return -EPERM;
1087
1088 count = request->count;
1089 order = drm_order(request->size);
1090 size = 1 << order;
1091
1092 alignment = (request->flags & _DRM_PAGE_ALIGN)
1093 ? PAGE_ALIGN(size) : size;
1094 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1095 total = PAGE_SIZE << page_order;
1096
1097 byte_count = 0;
1098 agp_offset = request->agp_start;
1099
1100 DRM_DEBUG("count: %d\n", count);
1101 DRM_DEBUG("order: %d\n", order);
1102 DRM_DEBUG("size: %d\n", size);
1103 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1104 DRM_DEBUG("alignment: %d\n", alignment);
1105 DRM_DEBUG("page_order: %d\n", page_order);
1106 DRM_DEBUG("total: %d\n", total);
1107
1108 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1109 return -EINVAL;
1110 if (dev->queue_count)
1111 return -EBUSY; /* Not while in use */
1112
1113 spin_lock(&dev->count_lock);
1114 if (dev->buf_use) {
1115 spin_unlock(&dev->count_lock);
1116 return -EBUSY;
1117 }
1118 atomic_inc(&dev->buf_alloc);
1119 spin_unlock(&dev->count_lock);
1120
1121 mutex_lock(&dev->struct_mutex);
1122 entry = &dma->bufs[order];
1123 if (entry->buf_count) {
1124 mutex_unlock(&dev->struct_mutex);
1125 atomic_dec(&dev->buf_alloc);
1126 return -ENOMEM; /* May only call once for each order */
1127 }
1128
1129 if (count < 0 || count > 4096) {
1130 mutex_unlock(&dev->struct_mutex);
1131 atomic_dec(&dev->buf_alloc);
1132 return -EINVAL;
1133 }
1134
1135 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1136 DRM_MEM_BUFS);
1137 if (!entry->buflist) {
1138 mutex_unlock(&dev->struct_mutex);
1139 atomic_dec(&dev->buf_alloc);
1140 return -ENOMEM;
1141 }
1142 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1143
1144 entry->buf_size = size;
1145 entry->page_order = page_order;
1146
1147 offset = 0;
1148
1149 while (entry->buf_count < count) {
1150 buf = &entry->buflist[entry->buf_count];
1151 buf->idx = dma->buf_count + entry->buf_count;
1152 buf->total = alignment;
1153 buf->order = order;
1154 buf->used = 0;
1155
1156 buf->offset = (dma->byte_count + offset);
1157 buf->bus_address = agp_offset + offset;
1158 buf->address = (void *)(agp_offset + offset);
1159 buf->next = NULL;
1160 buf->waiting = 0;
1161 buf->pending = 0;
1162 init_waitqueue_head(&buf->dma_wait);
1163 buf->filp = NULL;
1164
1165 buf->dev_priv_size = dev->driver->dev_priv_size;
1166 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1167 if (!buf->dev_private) {
1168 /* Set count correctly so we free the proper amount. */
1169 entry->buf_count = count;
1170 drm_cleanup_buf_error(dev, entry);
1171 mutex_unlock(&dev->struct_mutex);
1172 atomic_dec(&dev->buf_alloc);
1173 return -ENOMEM;
1174 }
1175 memset(buf->dev_private, 0, buf->dev_priv_size);
1176
1177 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1178
1179 offset += alignment;
1180 entry->buf_count++;
1181 byte_count += PAGE_SIZE << page_order;
1182 }
1183
1184 DRM_DEBUG("byte_count: %d\n", byte_count);
1185
1186 temp_buflist = drm_realloc(dma->buflist,
1187 dma->buf_count * sizeof(*dma->buflist),
1188 (dma->buf_count + entry->buf_count)
1189 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1190 if (!temp_buflist) {
1191 /* Free the entry because it isn't valid */
1192 drm_cleanup_buf_error(dev, entry);
1193 mutex_unlock(&dev->struct_mutex);
1194 atomic_dec(&dev->buf_alloc);
1195 return -ENOMEM;
1196 }
1197 dma->buflist = temp_buflist;
1198
1199 for (i = 0; i < entry->buf_count; i++) {
1200 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1201 }
1202
1203 dma->buf_count += entry->buf_count;
1204 dma->seg_count += entry->seg_count;
1205 dma->page_count += byte_count >> PAGE_SHIFT;
1206 dma->byte_count += byte_count;
1207
1208 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1209 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1210
1211 mutex_unlock(&dev->struct_mutex);
1212
1213 request->count = entry->buf_count;
1214 request->size = size;
1215
1216 dma->flags = _DRM_DMA_USE_FB;
1217
1218 atomic_dec(&dev->buf_alloc);
1219 return 0;
1220 }
1221
1222
1223 /**
1224 * Add buffers for DMA transfers (ioctl).
1225 *
1226 * \param inode device inode.
1227 * \param filp file pointer.
1228 * \param cmd command.
1229 * \param arg pointer to a drm_buf_desc_t request.
1230 * \return zero on success or a negative number on failure.
1231 *
1232 * According with the memory type specified in drm_buf_desc::flags and the
1233 * build options, it dispatches the call either to addbufs_agp(),
1234 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1235 * PCI memory respectively.
1236 */
1237 int drm_addbufs(struct inode *inode, struct file *filp,
1238 unsigned int cmd, unsigned long arg)
1239 {
1240 drm_buf_desc_t request;
1241 drm_file_t *priv = filp->private_data;
1242 drm_device_t *dev = priv->head->dev;
1243 int ret;
1244
1245 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1246 return -EINVAL;
1247
1248 if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
1249 sizeof(request)))
1250 return -EFAULT;
1251
1252 #if __OS_HAS_AGP
1253 if (request.flags & _DRM_AGP_BUFFER)
1254 ret = drm_addbufs_agp(dev, &request);
1255 else
1256 #endif
1257 if (request.flags & _DRM_SG_BUFFER)
1258 ret = drm_addbufs_sg(dev, &request);
1259 else if (request.flags & _DRM_FB_BUFFER)
1260 ret = drm_addbufs_fb(dev, &request);
1261 else
1262 ret = drm_addbufs_pci(dev, &request);
1263
1264 if (ret == 0) {
1265 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1266 ret = -EFAULT;
1267 }
1268 }
1269 return ret;
1270 }
1271
1272 /**
1273 * Get information about the buffer mappings.
1274 *
1275 * This was originally mean for debugging purposes, or by a sophisticated
1276 * client library to determine how best to use the available buffers (e.g.,
1277 * large buffers can be used for image transfer).
1278 *
1279 * \param inode device inode.
1280 * \param filp file pointer.
1281 * \param cmd command.
1282 * \param arg pointer to a drm_buf_info structure.
1283 * \return zero on success or a negative number on failure.
1284 *
1285 * Increments drm_device::buf_use while holding the drm_device::count_lock
1286 * lock, preventing of allocating more buffers after this call. Information
1287 * about each requested buffer is then copied into user space.
1288 */
1289 int drm_infobufs(struct inode *inode, struct file *filp,
1290 unsigned int cmd, unsigned long arg)
1291 {
1292 drm_file_t *priv = filp->private_data;
1293 drm_device_t *dev = priv->head->dev;
1294 drm_device_dma_t *dma = dev->dma;
1295 drm_buf_info_t request;
1296 drm_buf_info_t __user *argp = (void __user *)arg;
1297 int i;
1298 int count;
1299
1300 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1301 return -EINVAL;
1302
1303 if (!dma)
1304 return -EINVAL;
1305
1306 spin_lock(&dev->count_lock);
1307 if (atomic_read(&dev->buf_alloc)) {
1308 spin_unlock(&dev->count_lock);
1309 return -EBUSY;
1310 }
1311 ++dev->buf_use; /* Can't allocate more after this call */
1312 spin_unlock(&dev->count_lock);
1313
1314 if (copy_from_user(&request, argp, sizeof(request)))
1315 return -EFAULT;
1316
1317 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1318 if (dma->bufs[i].buf_count)
1319 ++count;
1320 }
1321
1322 DRM_DEBUG("count = %d\n", count);
1323
1324 if (request.count >= count) {
1325 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1326 if (dma->bufs[i].buf_count) {
1327 drm_buf_desc_t __user *to =
1328 &request.list[count];
1329 drm_buf_entry_t *from = &dma->bufs[i];
1330 drm_freelist_t *list = &dma->bufs[i].freelist;
1331 if (copy_to_user(&to->count,
1332 &from->buf_count,
1333 sizeof(from->buf_count)) ||
1334 copy_to_user(&to->size,
1335 &from->buf_size,
1336 sizeof(from->buf_size)) ||
1337 copy_to_user(&to->low_mark,
1338 &list->low_mark,
1339 sizeof(list->low_mark)) ||
1340 copy_to_user(&to->high_mark,
1341 &list->high_mark,
1342 sizeof(list->high_mark)))
1343 return -EFAULT;
1344
1345 DRM_DEBUG("%d %d %d %d %d\n",
1346 i,
1347 dma->bufs[i].buf_count,
1348 dma->bufs[i].buf_size,
1349 dma->bufs[i].freelist.low_mark,
1350 dma->bufs[i].freelist.high_mark);
1351 ++count;
1352 }
1353 }
1354 }
1355 request.count = count;
1356
1357 if (copy_to_user(argp, &request, sizeof(request)))
1358 return -EFAULT;
1359
1360 return 0;
1361 }
1362
1363 /**
1364 * Specifies a low and high water mark for buffer allocation
1365 *
1366 * \param inode device inode.
1367 * \param filp file pointer.
1368 * \param cmd command.
1369 * \param arg a pointer to a drm_buf_desc structure.
1370 * \return zero on success or a negative number on failure.
1371 *
1372 * Verifies that the size order is bounded between the admissible orders and
1373 * updates the respective drm_device_dma::bufs entry low and high water mark.
1374 *
1375 * \note This ioctl is deprecated and mostly never used.
1376 */
1377 int drm_markbufs(struct inode *inode, struct file *filp,
1378 unsigned int cmd, unsigned long arg)
1379 {
1380 drm_file_t *priv = filp->private_data;
1381 drm_device_t *dev = priv->head->dev;
1382 drm_device_dma_t *dma = dev->dma;
1383 drm_buf_desc_t request;
1384 int order;
1385 drm_buf_entry_t *entry;
1386
1387 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1388 return -EINVAL;
1389
1390 if (!dma)
1391 return -EINVAL;
1392
1393 if (copy_from_user(&request,
1394 (drm_buf_desc_t __user *) arg, sizeof(request)))
1395 return -EFAULT;
1396
1397 DRM_DEBUG("%d, %d, %d\n",
1398 request.size, request.low_mark, request.high_mark);
1399 order = drm_order(request.size);
1400 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1401 return -EINVAL;
1402 entry = &dma->bufs[order];
1403
1404 if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1405 return -EINVAL;
1406 if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1407 return -EINVAL;
1408
1409 entry->freelist.low_mark = request.low_mark;
1410 entry->freelist.high_mark = request.high_mark;
1411
1412 return 0;
1413 }
1414
1415 /**
1416 * Unreserve the buffers in list, previously reserved using drmDMA.
1417 *
1418 * \param inode device inode.
1419 * \param filp file pointer.
1420 * \param cmd command.
1421 * \param arg pointer to a drm_buf_free structure.
1422 * \return zero on success or a negative number on failure.
1423 *
1424 * Calls free_buffer() for each used buffer.
1425 * This function is primarily used for debugging.
1426 */
1427 int drm_freebufs(struct inode *inode, struct file *filp,
1428 unsigned int cmd, unsigned long arg)
1429 {
1430 drm_file_t *priv = filp->private_data;
1431 drm_device_t *dev = priv->head->dev;
1432 drm_device_dma_t *dma = dev->dma;
1433 drm_buf_free_t request;
1434 int i;
1435 int idx;
1436 drm_buf_t *buf;
1437
1438 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1439 return -EINVAL;
1440
1441 if (!dma)
1442 return -EINVAL;
1443
1444 if (copy_from_user(&request,
1445 (drm_buf_free_t __user *) arg, sizeof(request)))
1446 return -EFAULT;
1447
1448 DRM_DEBUG("%d\n", request.count);
1449 for (i = 0; i < request.count; i++) {
1450 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1451 return -EFAULT;
1452 if (idx < 0 || idx >= dma->buf_count) {
1453 DRM_ERROR("Index %d (of %d max)\n",
1454 idx, dma->buf_count - 1);
1455 return -EINVAL;
1456 }
1457 buf = dma->buflist[idx];
1458 if (buf->filp != filp) {
1459 DRM_ERROR("Process %d freeing buffer not owned\n",
1460 current->pid);
1461 return -EINVAL;
1462 }
1463 drm_free_buffer(dev, buf);
1464 }
1465
1466 return 0;
1467 }
1468
1469 /**
1470 * Maps all of the DMA buffers into client-virtual space (ioctl).
1471 *
1472 * \param inode device inode.
1473 * \param filp file pointer.
1474 * \param cmd command.
1475 * \param arg pointer to a drm_buf_map structure.
1476 * \return zero on success or a negative number on failure.
1477 *
1478 * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1479 * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1480 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1481 * drm_mmap_dma().
1482 */
1483 int drm_mapbufs(struct inode *inode, struct file *filp,
1484 unsigned int cmd, unsigned long arg)
1485 {
1486 drm_file_t *priv = filp->private_data;
1487 drm_device_t *dev = priv->head->dev;
1488 drm_device_dma_t *dma = dev->dma;
1489 drm_buf_map_t __user *argp = (void __user *)arg;
1490 int retcode = 0;
1491 const int zero = 0;
1492 unsigned long virtual;
1493 unsigned long address;
1494 drm_buf_map_t request;
1495 int i;
1496
1497 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1498 return -EINVAL;
1499
1500 if (!dma)
1501 return -EINVAL;
1502
1503 spin_lock(&dev->count_lock);
1504 if (atomic_read(&dev->buf_alloc)) {
1505 spin_unlock(&dev->count_lock);
1506 return -EBUSY;
1507 }
1508 dev->buf_use++; /* Can't allocate more after this call */
1509 spin_unlock(&dev->count_lock);
1510
1511 if (copy_from_user(&request, argp, sizeof(request)))
1512 return -EFAULT;
1513
1514 if (request.count >= dma->buf_count) {
1515 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1516 || (drm_core_check_feature(dev, DRIVER_SG)
1517 && (dma->flags & _DRM_DMA_USE_SG))
1518 || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1519 && (dma->flags & _DRM_DMA_USE_FB))) {
1520 drm_map_t *map = dev->agp_buffer_map;
1521 unsigned long token = dev->agp_buffer_token;
1522
1523 if (!map) {
1524 retcode = -EINVAL;
1525 goto done;
1526 }
1527
1528 down_write(&current->mm->mmap_sem);
1529 virtual = do_mmap(filp, 0, map->size,
1530 PROT_READ | PROT_WRITE,
1531 MAP_SHARED, token);
1532 up_write(&current->mm->mmap_sem);
1533 } else {
1534 down_write(&current->mm->mmap_sem);
1535 virtual = do_mmap(filp, 0, dma->byte_count,
1536 PROT_READ | PROT_WRITE,
1537 MAP_SHARED, 0);
1538 up_write(&current->mm->mmap_sem);
1539 }
1540 if (virtual > -1024UL) {
1541 /* Real error */
1542 retcode = (signed long)virtual;
1543 goto done;
1544 }
1545 request.virtual = (void __user *)virtual;
1546
1547 for (i = 0; i < dma->buf_count; i++) {
1548 if (copy_to_user(&request.list[i].idx,
1549 &dma->buflist[i]->idx,
1550 sizeof(request.list[0].idx))) {
1551 retcode = -EFAULT;
1552 goto done;
1553 }
1554 if (copy_to_user(&request.list[i].total,
1555 &dma->buflist[i]->total,
1556 sizeof(request.list[0].total))) {
1557 retcode = -EFAULT;
1558 goto done;
1559 }
1560 if (copy_to_user(&request.list[i].used,
1561 &zero, sizeof(zero))) {
1562 retcode = -EFAULT;
1563 goto done;
1564 }
1565 address = virtual + dma->buflist[i]->offset; /* *** */
1566 if (copy_to_user(&request.list[i].address,
1567 &address, sizeof(address))) {
1568 retcode = -EFAULT;
1569 goto done;
1570 }
1571 }
1572 }
1573 done:
1574 request.count = dma->buf_count;
1575 DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1576
1577 if (copy_to_user(argp, &request, sizeof(request)))
1578 return -EFAULT;
1579
1580 return retcode;
1581 }
1582
1583 /**
1584 * Compute size order. Returns the exponent of the smaller power of two which
1585 * is greater or equal to given number.
1586 *
1587 * \param size size.
1588 * \return order.
1589 *
1590 * \todo Can be made faster.
1591 */
1592 int drm_order(unsigned long size)
1593 {
1594 int order;
1595 unsigned long tmp;
1596
1597 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1598
1599 if (size & (size - 1))
1600 ++order;
1601
1602 return order;
1603 }
1604 EXPORT_SYMBOL(drm_order);
1605
1606
kernel source for telekom puls (alcatel/mediatek)