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drm: remove drm_file_t, drm_device_t and drm_head_t typedefs
[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(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 drm_map_list_t *drm_find_matching_map(struct drm_device *dev,
53 drm_local_map_t *map)
54 {
55 drm_map_list_t *entry;
56 list_for_each_entry(entry, &dev->maplist, head) {
57 if (entry->map && 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, drm_hash_item_t *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 filp file pointer.
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, drm_map_list_t ** maplist)
107 {
108 struct drm_map *map;
109 drm_map_list_t *list;
110 drm_dma_handle_t *dmah;
111 unsigned long user_token;
112 int ret;
113
114 map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
115 if (!map)
116 return -ENOMEM;
117
118 map->offset = offset;
119 map->size = size;
120 map->flags = flags;
121 map->type = type;
122
123 /* Only allow shared memory to be removable since we only keep enough
124 * book keeping information about shared memory to allow for removal
125 * when processes fork.
126 */
127 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
128 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
129 return -EINVAL;
130 }
131 DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
132 map->offset, map->size, map->type);
133 if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
134 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
135 return -EINVAL;
136 }
137 map->mtrr = -1;
138 map->handle = NULL;
139
140 switch (map->type) {
141 case _DRM_REGISTERS:
142 case _DRM_FRAME_BUFFER:
143 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
144 if (map->offset + (map->size-1) < map->offset ||
145 map->offset < virt_to_phys(high_memory)) {
146 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
147 return -EINVAL;
148 }
149 #endif
150 #ifdef __alpha__
151 map->offset += dev->hose->mem_space->start;
152 #endif
153 /* Some drivers preinitialize some maps, without the X Server
154 * needing to be aware of it. Therefore, we just return success
155 * when the server tries to create a duplicate map.
156 */
157 list = drm_find_matching_map(dev, map);
158 if (list != NULL) {
159 if (list->map->size != map->size) {
160 DRM_DEBUG("Matching maps of type %d with "
161 "mismatched sizes, (%ld vs %ld)\n",
162 map->type, map->size,
163 list->map->size);
164 list->map->size = map->size;
165 }
166
167 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
168 *maplist = list;
169 return 0;
170 }
171
172 if (drm_core_has_MTRR(dev)) {
173 if (map->type == _DRM_FRAME_BUFFER ||
174 (map->flags & _DRM_WRITE_COMBINING)) {
175 map->mtrr = mtrr_add(map->offset, map->size,
176 MTRR_TYPE_WRCOMB, 1);
177 }
178 }
179 if (map->type == _DRM_REGISTERS)
180 map->handle = ioremap(map->offset, map->size);
181 break;
182 case _DRM_SHM:
183 list = drm_find_matching_map(dev, map);
184 if (list != NULL) {
185 if(list->map->size != map->size) {
186 DRM_DEBUG("Matching maps of type %d with "
187 "mismatched sizes, (%ld vs %ld)\n",
188 map->type, map->size, list->map->size);
189 list->map->size = map->size;
190 }
191
192 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
193 *maplist = list;
194 return 0;
195 }
196 map->handle = vmalloc_user(map->size);
197 DRM_DEBUG("%lu %d %p\n",
198 map->size, drm_order(map->size), map->handle);
199 if (!map->handle) {
200 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
201 return -ENOMEM;
202 }
203 map->offset = (unsigned long)map->handle;
204 if (map->flags & _DRM_CONTAINS_LOCK) {
205 /* Prevent a 2nd X Server from creating a 2nd lock */
206 if (dev->lock.hw_lock != NULL) {
207 vfree(map->handle);
208 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
209 return -EBUSY;
210 }
211 dev->sigdata.lock = dev->lock.hw_lock = map->handle; /* Pointer to lock */
212 }
213 break;
214 case _DRM_AGP: {
215 drm_agp_mem_t *entry;
216 int valid = 0;
217
218 if (!drm_core_has_AGP(dev)) {
219 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
220 return -EINVAL;
221 }
222 #ifdef __alpha__
223 map->offset += dev->hose->mem_space->start;
224 #endif
225 /* Note: dev->agp->base may actually be 0 when the DRM
226 * is not in control of AGP space. But if user space is
227 * it should already have added the AGP base itself.
228 */
229 map->offset += dev->agp->base;
230 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
231
232 /* This assumes the DRM is in total control of AGP space.
233 * It's not always the case as AGP can be in the control
234 * of user space (i.e. i810 driver). So this loop will get
235 * skipped and we double check that dev->agp->memory is
236 * actually set as well as being invalid before EPERM'ing
237 */
238 list_for_each_entry(entry, &dev->agp->memory, head) {
239 if ((map->offset >= entry->bound) &&
240 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
241 valid = 1;
242 break;
243 }
244 }
245 if (!list_empty(&dev->agp->memory) && !valid) {
246 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
247 return -EPERM;
248 }
249 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
250
251 break;
252 }
253 case _DRM_SCATTER_GATHER:
254 if (!dev->sg) {
255 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
256 return -EINVAL;
257 }
258 map->offset += (unsigned long)dev->sg->virtual;
259 break;
260 case _DRM_CONSISTENT:
261 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
262 * As we're limiting the address to 2^32-1 (or less),
263 * casting it down to 32 bits is no problem, but we
264 * need to point to a 64bit variable first. */
265 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
266 if (!dmah) {
267 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
268 return -ENOMEM;
269 }
270 map->handle = dmah->vaddr;
271 map->offset = (unsigned long)dmah->busaddr;
272 kfree(dmah);
273 break;
274 default:
275 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
276 return -EINVAL;
277 }
278
279 list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
280 if (!list) {
281 if (map->type == _DRM_REGISTERS)
282 iounmap(map->handle);
283 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
284 return -EINVAL;
285 }
286 memset(list, 0, sizeof(*list));
287 list->map = map;
288
289 mutex_lock(&dev->struct_mutex);
290 list_add(&list->head, &dev->maplist);
291
292 /* Assign a 32-bit handle */
293 /* We do it here so that dev->struct_mutex protects the increment */
294 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
295 map->offset;
296 ret = drm_map_handle(dev, &list->hash, user_token, 0);
297 if (ret) {
298 if (map->type == _DRM_REGISTERS)
299 iounmap(map->handle);
300 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
301 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
302 mutex_unlock(&dev->struct_mutex);
303 return ret;
304 }
305
306 list->user_token = list->hash.key << PAGE_SHIFT;
307 mutex_unlock(&dev->struct_mutex);
308
309 *maplist = list;
310 return 0;
311 }
312
313 int drm_addmap(struct drm_device * dev, unsigned int offset,
314 unsigned int size, enum drm_map_type type,
315 enum drm_map_flags flags, drm_local_map_t ** map_ptr)
316 {
317 drm_map_list_t *list;
318 int rc;
319
320 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
321 if (!rc)
322 *map_ptr = list->map;
323 return rc;
324 }
325
326 EXPORT_SYMBOL(drm_addmap);
327
328 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
329 unsigned int cmd, unsigned long arg)
330 {
331 struct drm_file *priv = filp->private_data;
332 struct drm_device *dev = priv->head->dev;
333 struct drm_map map;
334 drm_map_list_t *maplist;
335 struct drm_map __user *argp = (void __user *)arg;
336 int err;
337
338 if (!(filp->f_mode & 3))
339 return -EACCES; /* Require read/write */
340
341 if (copy_from_user(&map, argp, sizeof(map))) {
342 return -EFAULT;
343 }
344
345 if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
346 return -EPERM;
347
348 err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
349 &maplist);
350
351 if (err)
352 return err;
353
354 if (copy_to_user(argp, maplist->map, sizeof(struct drm_map)))
355 return -EFAULT;
356
357 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
358 if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
359 return -EFAULT;
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 filp file pointer.
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 drm_map_list_t *r_list = NULL, *list_t;
382 drm_dma_handle_t dmah;
383 int found = 0;
384
385 /* Find the list entry for the map and remove it */
386 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
387 if (r_list->map == map) {
388 list_del(&r_list->head);
389 drm_ht_remove_key(&dev->map_hash,
390 r_list->user_token >> PAGE_SHIFT);
391 drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
392 found = 1;
393 break;
394 }
395 }
396
397 if (!found)
398 return -EINVAL;
399
400 switch (map->type) {
401 case _DRM_REGISTERS:
402 iounmap(map->handle);
403 /* FALLTHROUGH */
404 case _DRM_FRAME_BUFFER:
405 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
406 int retcode;
407 retcode = mtrr_del(map->mtrr, map->offset, map->size);
408 DRM_DEBUG("mtrr_del=%d\n", retcode);
409 }
410 break;
411 case _DRM_SHM:
412 vfree(map->handle);
413 break;
414 case _DRM_AGP:
415 case _DRM_SCATTER_GATHER:
416 break;
417 case _DRM_CONSISTENT:
418 dmah.vaddr = map->handle;
419 dmah.busaddr = map->offset;
420 dmah.size = map->size;
421 __drm_pci_free(dev, &dmah);
422 break;
423 }
424 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
425
426 return 0;
427 }
428
429 int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
430 {
431 int ret;
432
433 mutex_lock(&dev->struct_mutex);
434 ret = drm_rmmap_locked(dev, map);
435 mutex_unlock(&dev->struct_mutex);
436
437 return ret;
438 }
439
440 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
441 * the last close of the device, and this is necessary for cleanup when things
442 * exit uncleanly. Therefore, having userland manually remove mappings seems
443 * like a pointless exercise since they're going away anyway.
444 *
445 * One use case might be after addmap is allowed for normal users for SHM and
446 * gets used by drivers that the server doesn't need to care about. This seems
447 * unlikely.
448 */
449 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
450 unsigned int cmd, unsigned long arg)
451 {
452 struct drm_file *priv = filp->private_data;
453 struct drm_device *dev = priv->head->dev;
454 struct drm_map request;
455 drm_local_map_t *map = NULL;
456 drm_map_list_t *r_list;
457 int ret;
458
459 if (copy_from_user(&request, (struct drm_map __user *) arg, sizeof(request))) {
460 return -EFAULT;
461 }
462
463 mutex_lock(&dev->struct_mutex);
464 list_for_each_entry(r_list, &dev->maplist, head) {
465 if (r_list->map &&
466 r_list->user_token == (unsigned long)request.handle &&
467 r_list->map->flags & _DRM_REMOVABLE) {
468 map = r_list->map;
469 break;
470 }
471 }
472
473 /* List has wrapped around to the head pointer, or its empty we didn't
474 * find anything.
475 */
476 if (list_empty(&dev->maplist) || !map) {
477 mutex_unlock(&dev->struct_mutex);
478 return -EINVAL;
479 }
480
481 if (!map) {
482 mutex_unlock(&dev->struct_mutex);
483 return -EINVAL;
484 }
485
486 /* Register and framebuffer maps are permanent */
487 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
488 mutex_unlock(&dev->struct_mutex);
489 return 0;
490 }
491
492 ret = drm_rmmap_locked(dev, map);
493
494 mutex_unlock(&dev->struct_mutex);
495
496 return ret;
497 }
498
499 /**
500 * Cleanup after an error on one of the addbufs() functions.
501 *
502 * \param dev DRM device.
503 * \param entry buffer entry where the error occurred.
504 *
505 * Frees any pages and buffers associated with the given entry.
506 */
507 static void drm_cleanup_buf_error(struct drm_device * dev, drm_buf_entry_t * 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 drm_device_dma_t *dma = dev->dma;
555 drm_buf_entry_t *entry;
556 drm_agp_mem_t *agp_entry;
557 drm_buf_t *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 drm_buf_t **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->filp = 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 drm_device_dma_t *dma = dev->dma;
725 int count;
726 int order;
727 int size;
728 int total;
729 int page_order;
730 drm_buf_entry_t *entry;
731 drm_dma_handle_t *dmah;
732 drm_buf_t *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 drm_buf_t **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->filp = 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 drm_device_dma_t *dma = dev->dma;
951 drm_buf_entry_t *entry;
952 drm_buf_t *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 drm_buf_t **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->filp = 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 drm_device_dma_t *dma = dev->dma;
1113 drm_buf_entry_t *entry;
1114 drm_buf_t *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 drm_buf_t **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->filp = 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 filp file pointer.
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 inode *inode, struct file *filp,
1286 unsigned int cmd, unsigned long arg)
1287 {
1288 struct drm_buf_desc request;
1289 struct drm_file *priv = filp->private_data;
1290 struct drm_device *dev = priv->head->dev;
1291 int ret;
1292
1293 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1294 return -EINVAL;
1295
1296 if (copy_from_user(&request, (struct drm_buf_desc __user *) arg,
1297 sizeof(request)))
1298 return -EFAULT;
1299
1300 #if __OS_HAS_AGP
1301 if (request.flags & _DRM_AGP_BUFFER)
1302 ret = drm_addbufs_agp(dev, &request);
1303 else
1304 #endif
1305 if (request.flags & _DRM_SG_BUFFER)
1306 ret = drm_addbufs_sg(dev, &request);
1307 else if (request.flags & _DRM_FB_BUFFER)
1308 ret = drm_addbufs_fb(dev, &request);
1309 else
1310 ret = drm_addbufs_pci(dev, &request);
1311
1312 if (ret == 0) {
1313 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1314 ret = -EFAULT;
1315 }
1316 }
1317 return ret;
1318 }
1319
1320 /**
1321 * Get information about the buffer mappings.
1322 *
1323 * This was originally mean for debugging purposes, or by a sophisticated
1324 * client library to determine how best to use the available buffers (e.g.,
1325 * large buffers can be used for image transfer).
1326 *
1327 * \param inode device inode.
1328 * \param filp file pointer.
1329 * \param cmd command.
1330 * \param arg pointer to a drm_buf_info structure.
1331 * \return zero on success or a negative number on failure.
1332 *
1333 * Increments drm_device::buf_use while holding the drm_device::count_lock
1334 * lock, preventing of allocating more buffers after this call. Information
1335 * about each requested buffer is then copied into user space.
1336 */
1337 int drm_infobufs(struct inode *inode, struct file *filp,
1338 unsigned int cmd, unsigned long arg)
1339 {
1340 struct drm_file *priv = filp->private_data;
1341 struct drm_device *dev = priv->head->dev;
1342 drm_device_dma_t *dma = dev->dma;
1343 struct drm_buf_info request;
1344 struct drm_buf_info __user *argp = (void __user *)arg;
1345 int i;
1346 int count;
1347
1348 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1349 return -EINVAL;
1350
1351 if (!dma)
1352 return -EINVAL;
1353
1354 spin_lock(&dev->count_lock);
1355 if (atomic_read(&dev->buf_alloc)) {
1356 spin_unlock(&dev->count_lock);
1357 return -EBUSY;
1358 }
1359 ++dev->buf_use; /* Can't allocate more after this call */
1360 spin_unlock(&dev->count_lock);
1361
1362 if (copy_from_user(&request, argp, sizeof(request)))
1363 return -EFAULT;
1364
1365 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1366 if (dma->bufs[i].buf_count)
1367 ++count;
1368 }
1369
1370 DRM_DEBUG("count = %d\n", count);
1371
1372 if (request.count >= count) {
1373 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1374 if (dma->bufs[i].buf_count) {
1375 struct drm_buf_desc __user *to =
1376 &request.list[count];
1377 drm_buf_entry_t *from = &dma->bufs[i];
1378 drm_freelist_t *list = &dma->bufs[i].freelist;
1379 if (copy_to_user(&to->count,
1380 &from->buf_count,
1381 sizeof(from->buf_count)) ||
1382 copy_to_user(&to->size,
1383 &from->buf_size,
1384 sizeof(from->buf_size)) ||
1385 copy_to_user(&to->low_mark,
1386 &list->low_mark,
1387 sizeof(list->low_mark)) ||
1388 copy_to_user(&to->high_mark,
1389 &list->high_mark,
1390 sizeof(list->high_mark)))
1391 return -EFAULT;
1392
1393 DRM_DEBUG("%d %d %d %d %d\n",
1394 i,
1395 dma->bufs[i].buf_count,
1396 dma->bufs[i].buf_size,
1397 dma->bufs[i].freelist.low_mark,
1398 dma->bufs[i].freelist.high_mark);
1399 ++count;
1400 }
1401 }
1402 }
1403 request.count = count;
1404
1405 if (copy_to_user(argp, &request, sizeof(request)))
1406 return -EFAULT;
1407
1408 return 0;
1409 }
1410
1411 /**
1412 * Specifies a low and high water mark for buffer allocation
1413 *
1414 * \param inode device inode.
1415 * \param filp file pointer.
1416 * \param cmd command.
1417 * \param arg a pointer to a drm_buf_desc structure.
1418 * \return zero on success or a negative number on failure.
1419 *
1420 * Verifies that the size order is bounded between the admissible orders and
1421 * updates the respective drm_device_dma::bufs entry low and high water mark.
1422 *
1423 * \note This ioctl is deprecated and mostly never used.
1424 */
1425 int drm_markbufs(struct inode *inode, struct file *filp,
1426 unsigned int cmd, unsigned long arg)
1427 {
1428 struct drm_file *priv = filp->private_data;
1429 struct drm_device *dev = priv->head->dev;
1430 drm_device_dma_t *dma = dev->dma;
1431 struct drm_buf_desc request;
1432 int order;
1433 drm_buf_entry_t *entry;
1434
1435 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1436 return -EINVAL;
1437
1438 if (!dma)
1439 return -EINVAL;
1440
1441 if (copy_from_user(&request,
1442 (struct drm_buf_desc __user *) arg, sizeof(request)))
1443 return -EFAULT;
1444
1445 DRM_DEBUG("%d, %d, %d\n",
1446 request.size, request.low_mark, request.high_mark);
1447 order = drm_order(request.size);
1448 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1449 return -EINVAL;
1450 entry = &dma->bufs[order];
1451
1452 if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1453 return -EINVAL;
1454 if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1455 return -EINVAL;
1456
1457 entry->freelist.low_mark = request.low_mark;
1458 entry->freelist.high_mark = request.high_mark;
1459
1460 return 0;
1461 }
1462
1463 /**
1464 * Unreserve the buffers in list, previously reserved using drmDMA.
1465 *
1466 * \param inode device inode.
1467 * \param filp file pointer.
1468 * \param cmd command.
1469 * \param arg pointer to a drm_buf_free structure.
1470 * \return zero on success or a negative number on failure.
1471 *
1472 * Calls free_buffer() for each used buffer.
1473 * This function is primarily used for debugging.
1474 */
1475 int drm_freebufs(struct inode *inode, struct file *filp,
1476 unsigned int cmd, unsigned long arg)
1477 {
1478 struct drm_file *priv = filp->private_data;
1479 struct drm_device *dev = priv->head->dev;
1480 drm_device_dma_t *dma = dev->dma;
1481 struct drm_buf_free request;
1482 int i;
1483 int idx;
1484 drm_buf_t *buf;
1485
1486 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1487 return -EINVAL;
1488
1489 if (!dma)
1490 return -EINVAL;
1491
1492 if (copy_from_user(&request,
1493 (struct drm_buf_free __user *) arg, sizeof(request)))
1494 return -EFAULT;
1495
1496 DRM_DEBUG("%d\n", request.count);
1497 for (i = 0; i < request.count; i++) {
1498 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1499 return -EFAULT;
1500 if (idx < 0 || idx >= dma->buf_count) {
1501 DRM_ERROR("Index %d (of %d max)\n",
1502 idx, dma->buf_count - 1);
1503 return -EINVAL;
1504 }
1505 buf = dma->buflist[idx];
1506 if (buf->filp != filp) {
1507 DRM_ERROR("Process %d freeing buffer not owned\n",
1508 current->pid);
1509 return -EINVAL;
1510 }
1511 drm_free_buffer(dev, buf);
1512 }
1513
1514 return 0;
1515 }
1516
1517 /**
1518 * Maps all of the DMA buffers into client-virtual space (ioctl).
1519 *
1520 * \param inode device inode.
1521 * \param filp file pointer.
1522 * \param cmd command.
1523 * \param arg pointer to a drm_buf_map structure.
1524 * \return zero on success or a negative number on failure.
1525 *
1526 * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1527 * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1528 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1529 * drm_mmap_dma().
1530 */
1531 int drm_mapbufs(struct inode *inode, struct file *filp,
1532 unsigned int cmd, unsigned long arg)
1533 {
1534 struct drm_file *priv = filp->private_data;
1535 struct drm_device *dev = priv->head->dev;
1536 drm_device_dma_t *dma = dev->dma;
1537 struct drm_buf_map __user *argp = (void __user *)arg;
1538 int retcode = 0;
1539 const int zero = 0;
1540 unsigned long virtual;
1541 unsigned long address;
1542 struct drm_buf_map request;
1543 int i;
1544
1545 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1546 return -EINVAL;
1547
1548 if (!dma)
1549 return -EINVAL;
1550
1551 spin_lock(&dev->count_lock);
1552 if (atomic_read(&dev->buf_alloc)) {
1553 spin_unlock(&dev->count_lock);
1554 return -EBUSY;
1555 }
1556 dev->buf_use++; /* Can't allocate more after this call */
1557 spin_unlock(&dev->count_lock);
1558
1559 if (copy_from_user(&request, argp, sizeof(request)))
1560 return -EFAULT;
1561
1562 if (request.count >= dma->buf_count) {
1563 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1564 || (drm_core_check_feature(dev, DRIVER_SG)
1565 && (dma->flags & _DRM_DMA_USE_SG))
1566 || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1567 && (dma->flags & _DRM_DMA_USE_FB))) {
1568 struct drm_map *map = dev->agp_buffer_map;
1569 unsigned long token = dev->agp_buffer_token;
1570
1571 if (!map) {
1572 retcode = -EINVAL;
1573 goto done;
1574 }
1575
1576 down_write(&current->mm->mmap_sem);
1577 virtual = do_mmap(filp, 0, map->size,
1578 PROT_READ | PROT_WRITE,
1579 MAP_SHARED, token);
1580 up_write(&current->mm->mmap_sem);
1581 } else {
1582 down_write(&current->mm->mmap_sem);
1583 virtual = do_mmap(filp, 0, dma->byte_count,
1584 PROT_READ | PROT_WRITE,
1585 MAP_SHARED, 0);
1586 up_write(&current->mm->mmap_sem);
1587 }
1588 if (virtual > -1024UL) {
1589 /* Real error */
1590 retcode = (signed long)virtual;
1591 goto done;
1592 }
1593 request.virtual = (void __user *)virtual;
1594
1595 for (i = 0; i < dma->buf_count; i++) {
1596 if (copy_to_user(&request.list[i].idx,
1597 &dma->buflist[i]->idx,
1598 sizeof(request.list[0].idx))) {
1599 retcode = -EFAULT;
1600 goto done;
1601 }
1602 if (copy_to_user(&request.list[i].total,
1603 &dma->buflist[i]->total,
1604 sizeof(request.list[0].total))) {
1605 retcode = -EFAULT;
1606 goto done;
1607 }
1608 if (copy_to_user(&request.list[i].used,
1609 &zero, sizeof(zero))) {
1610 retcode = -EFAULT;
1611 goto done;
1612 }
1613 address = virtual + dma->buflist[i]->offset; /* *** */
1614 if (copy_to_user(&request.list[i].address,
1615 &address, sizeof(address))) {
1616 retcode = -EFAULT;
1617 goto done;
1618 }
1619 }
1620 }
1621 done:
1622 request.count = dma->buf_count;
1623 DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1624
1625 if (copy_to_user(argp, &request, sizeof(request)))
1626 return -EFAULT;
1627
1628 return retcode;
1629 }
1630
1631 /**
1632 * Compute size order. Returns the exponent of the smaller power of two which
1633 * is greater or equal to given number.
1634 *
1635 * \param size size.
1636 * \return order.
1637 *
1638 * \todo Can be made faster.
1639 */
1640 int drm_order(unsigned long size)
1641 {
1642 int order;
1643 unsigned long tmp;
1644
1645 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1646
1647 if (size & (size - 1))
1648 ++order;
1649
1650 return order;
1651 }
1652 EXPORT_SYMBOL(drm_order);
1653
1654
kernel source for telekom puls (alcatel/mediatek)