Merge branch 'irq-fixes-for-linus-4' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / drivers / gpu / drm / drm_bufs.c
1 /**
2  * \file drm_bufs.c
3  * Generic buffer template
4  *
5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
6  * \author Gareth Hughes <gareth@valinux.com>
7  */
8
9 /*
10  * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
11  *
12  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14  * All Rights Reserved.
15  *
16  * Permission is hereby granted, free of charge, to any person obtaining a
17  * copy of this software and associated documentation files (the "Software"),
18  * to deal in the Software without restriction, including without limitation
19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20  * and/or sell copies of the Software, and to permit persons to whom the
21  * Software is furnished to do so, subject to the following conditions:
22  *
23  * The above copyright notice and this permission notice (including the next
24  * paragraph) shall be included in all copies or substantial portions of the
25  * Software.
26  *
27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
30  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33  * OTHER DEALINGS IN THE SOFTWARE.
34  */
35
36 #include <linux/vmalloc.h>
37 #include "drmP.h"
38
39 unsigned long drm_get_resource_start(struct drm_device *dev, unsigned int resource)
40 {
41         return pci_resource_start(dev->pdev, resource);
42 }
43 EXPORT_SYMBOL(drm_get_resource_start);
44
45 unsigned long drm_get_resource_len(struct drm_device *dev, unsigned int resource)
46 {
47         return pci_resource_len(dev->pdev, resource);
48 }
49
50 EXPORT_SYMBOL(drm_get_resource_len);
51
52 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
53                                              drm_local_map_t *map)
54 {
55         struct drm_map_list *entry;
56         list_for_each_entry(entry, &dev->maplist, head) {
57                 if (entry->map && (entry->master == dev->primary->master) && (map->type == entry->map->type) &&
58                     ((entry->map->offset == map->offset) ||
59                      ((map->type == _DRM_SHM) && (map->flags&_DRM_CONTAINS_LOCK)))) {
60                         return entry;
61                 }
62         }
63
64         return NULL;
65 }
66
67 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
68                           unsigned long user_token, int hashed_handle)
69 {
70         int use_hashed_handle;
71 #if (BITS_PER_LONG == 64)
72         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
73 #elif (BITS_PER_LONG == 32)
74         use_hashed_handle = hashed_handle;
75 #else
76 #error Unsupported long size. Neither 64 nor 32 bits.
77 #endif
78
79         if (!use_hashed_handle) {
80                 int ret;
81                 hash->key = user_token >> PAGE_SHIFT;
82                 ret = drm_ht_insert_item(&dev->map_hash, hash);
83                 if (ret != -EINVAL)
84                         return ret;
85         }
86         return drm_ht_just_insert_please(&dev->map_hash, hash,
87                                          user_token, 32 - PAGE_SHIFT - 3,
88                                          0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT);
89 }
90
91 /**
92  * Ioctl to specify a range of memory that is available for mapping by a non-root process.
93  *
94  * \param inode device inode.
95  * \param file_priv DRM file private.
96  * \param cmd command.
97  * \param arg pointer to a drm_map structure.
98  * \return zero on success or a negative value on error.
99  *
100  * Adjusts the memory offset to its absolute value according to the mapping
101  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
102  * applicable and if supported by the kernel.
103  */
104 static int drm_addmap_core(struct drm_device * dev, unsigned int offset,
105                            unsigned int size, enum drm_map_type type,
106                            enum drm_map_flags flags,
107                            struct drm_map_list ** maplist)
108 {
109         struct drm_map *map;
110         struct drm_map_list *list;
111         drm_dma_handle_t *dmah;
112         unsigned long user_token;
113         int ret;
114
115         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
116         if (!map)
117                 return -ENOMEM;
118
119         map->offset = offset;
120         map->size = size;
121         map->flags = flags;
122         map->type = type;
123
124         /* Only allow shared memory to be removable since we only keep enough
125          * book keeping information about shared memory to allow for removal
126          * when processes fork.
127          */
128         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
129                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
130                 return -EINVAL;
131         }
132         DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
133                   map->offset, map->size, map->type);
134         if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
135                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
136                 return -EINVAL;
137         }
138         map->mtrr = -1;
139         map->handle = NULL;
140
141         switch (map->type) {
142         case _DRM_REGISTERS:
143         case _DRM_FRAME_BUFFER:
144 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
145                 if (map->offset + (map->size-1) < map->offset ||
146                     map->offset < virt_to_phys(high_memory)) {
147                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
148                         return -EINVAL;
149                 }
150 #endif
151 #ifdef __alpha__
152                 map->offset += dev->hose->mem_space->start;
153 #endif
154                 /* Some drivers preinitialize some maps, without the X Server
155                  * needing to be aware of it.  Therefore, we just return success
156                  * when the server tries to create a duplicate map.
157                  */
158                 list = drm_find_matching_map(dev, map);
159                 if (list != NULL) {
160                         if (list->map->size != map->size) {
161                                 DRM_DEBUG("Matching maps of type %d with "
162                                           "mismatched sizes, (%ld vs %ld)\n",
163                                           map->type, map->size,
164                                           list->map->size);
165                                 list->map->size = map->size;
166                         }
167
168                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
169                         *maplist = list;
170                         return 0;
171                 }
172
173                 if (drm_core_has_MTRR(dev)) {
174                         if (map->type == _DRM_FRAME_BUFFER ||
175                             (map->flags & _DRM_WRITE_COMBINING)) {
176                                 map->mtrr = mtrr_add(map->offset, map->size,
177                                                      MTRR_TYPE_WRCOMB, 1);
178                         }
179                 }
180                 if (map->type == _DRM_REGISTERS) {
181                         map->handle = ioremap(map->offset, map->size);
182                         if (!map->handle) {
183                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
184                                 return -ENOMEM;
185                         }
186                 }
187
188                 break;
189         case _DRM_SHM:
190                 list = drm_find_matching_map(dev, map);
191                 if (list != NULL) {
192                         if(list->map->size != map->size) {
193                                 DRM_DEBUG("Matching maps of type %d with "
194                                           "mismatched sizes, (%ld vs %ld)\n",
195                                           map->type, map->size, list->map->size);
196                                 list->map->size = map->size;
197                         }
198
199                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
200                         *maplist = list;
201                         return 0;
202                 }
203                 map->handle = vmalloc_user(map->size);
204                 DRM_DEBUG("%lu %d %p\n",
205                           map->size, drm_order(map->size), map->handle);
206                 if (!map->handle) {
207                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
208                         return -ENOMEM;
209                 }
210                 map->offset = (unsigned long)map->handle;
211                 if (map->flags & _DRM_CONTAINS_LOCK) {
212                         /* Prevent a 2nd X Server from creating a 2nd lock */
213                         if (dev->primary->master->lock.hw_lock != NULL) {
214                                 vfree(map->handle);
215                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
216                                 return -EBUSY;
217                         }
218                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
219                 }
220                 break;
221         case _DRM_AGP: {
222                 struct drm_agp_mem *entry;
223                 int valid = 0;
224
225                 if (!drm_core_has_AGP(dev)) {
226                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
227                         return -EINVAL;
228                 }
229 #ifdef __alpha__
230                 map->offset += dev->hose->mem_space->start;
231 #endif
232                 /* In some cases (i810 driver), user space may have already
233                  * added the AGP base itself, because dev->agp->base previously
234                  * only got set during AGP enable.  So, only add the base
235                  * address if the map's offset isn't already within the
236                  * aperture.
237                  */
238                 if (map->offset < dev->agp->base ||
239                     map->offset > dev->agp->base +
240                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
241                         map->offset += dev->agp->base;
242                 }
243                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
244
245                 /* This assumes the DRM is in total control of AGP space.
246                  * It's not always the case as AGP can be in the control
247                  * of user space (i.e. i810 driver). So this loop will get
248                  * skipped and we double check that dev->agp->memory is
249                  * actually set as well as being invalid before EPERM'ing
250                  */
251                 list_for_each_entry(entry, &dev->agp->memory, head) {
252                         if ((map->offset >= entry->bound) &&
253                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
254                                 valid = 1;
255                                 break;
256                         }
257                 }
258                 if (!list_empty(&dev->agp->memory) && !valid) {
259                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
260                         return -EPERM;
261                 }
262                 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
263
264                 break;
265         case _DRM_GEM:
266                 DRM_ERROR("tried to rmmap GEM object\n");
267                 break;
268         }
269         case _DRM_SCATTER_GATHER:
270                 if (!dev->sg) {
271                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
272                         return -EINVAL;
273                 }
274                 map->offset += (unsigned long)dev->sg->virtual;
275                 break;
276         case _DRM_CONSISTENT:
277                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
278                  * As we're limiting the address to 2^32-1 (or less),
279                  * casting it down to 32 bits is no problem, but we
280                  * need to point to a 64bit variable first. */
281                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
282                 if (!dmah) {
283                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
284                         return -ENOMEM;
285                 }
286                 map->handle = dmah->vaddr;
287                 map->offset = (unsigned long)dmah->busaddr;
288                 kfree(dmah);
289                 break;
290         default:
291                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
292                 return -EINVAL;
293         }
294
295         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
296         if (!list) {
297                 if (map->type == _DRM_REGISTERS)
298                         iounmap(map->handle);
299                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
300                 return -EINVAL;
301         }
302         memset(list, 0, sizeof(*list));
303         list->map = map;
304
305         mutex_lock(&dev->struct_mutex);
306         list_add(&list->head, &dev->maplist);
307
308         /* Assign a 32-bit handle */
309         /* We do it here so that dev->struct_mutex protects the increment */
310         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
311                 map->offset;
312         ret = drm_map_handle(dev, &list->hash, user_token, 0);
313         if (ret) {
314                 if (map->type == _DRM_REGISTERS)
315                         iounmap(map->handle);
316                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
317                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
318                 mutex_unlock(&dev->struct_mutex);
319                 return ret;
320         }
321
322         list->user_token = list->hash.key << PAGE_SHIFT;
323         mutex_unlock(&dev->struct_mutex);
324
325         list->master = dev->primary->master;
326         *maplist = list;
327         return 0;
328         }
329
330 int drm_addmap(struct drm_device * dev, unsigned int offset,
331                unsigned int size, enum drm_map_type type,
332                enum drm_map_flags flags, drm_local_map_t ** map_ptr)
333 {
334         struct drm_map_list *list;
335         int rc;
336
337         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
338         if (!rc)
339                 *map_ptr = list->map;
340         return rc;
341 }
342
343 EXPORT_SYMBOL(drm_addmap);
344
345 int drm_addmap_ioctl(struct drm_device *dev, void *data,
346                      struct drm_file *file_priv)
347 {
348         struct drm_map *map = data;
349         struct drm_map_list *maplist;
350         int err;
351
352         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
353                 return -EPERM;
354
355         err = drm_addmap_core(dev, map->offset, map->size, map->type,
356                               map->flags, &maplist);
357
358         if (err)
359                 return err;
360
361         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
362         map->handle = (void *)(unsigned long)maplist->user_token;
363         return 0;
364 }
365
366 /**
367  * Remove a map private from list and deallocate resources if the mapping
368  * isn't in use.
369  *
370  * \param inode device inode.
371  * \param file_priv DRM file private.
372  * \param cmd command.
373  * \param arg pointer to a struct drm_map structure.
374  * \return zero on success or a negative value on error.
375  *
376  * Searches the map on drm_device::maplist, removes it from the list, see if
377  * its being used, and free any associate resource (such as MTRR's) if it's not
378  * being on use.
379  *
380  * \sa drm_addmap
381  */
382 int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
383 {
384         struct drm_map_list *r_list = NULL, *list_t;
385         drm_dma_handle_t dmah;
386         int found = 0;
387         struct drm_master *master;
388
389         /* Find the list entry for the map and remove it */
390         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
391                 if (r_list->map == map) {
392                         master = r_list->master;
393                         list_del(&r_list->head);
394                         drm_ht_remove_key(&dev->map_hash,
395                                           r_list->user_token >> PAGE_SHIFT);
396                         drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
397                         found = 1;
398                         break;
399                 }
400         }
401
402         if (!found)
403                 return -EINVAL;
404
405         switch (map->type) {
406         case _DRM_REGISTERS:
407                 iounmap(map->handle);
408                 /* FALLTHROUGH */
409         case _DRM_FRAME_BUFFER:
410                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
411                         int retcode;
412                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
413                         DRM_DEBUG("mtrr_del=%d\n", retcode);
414                 }
415                 break;
416         case _DRM_SHM:
417                 vfree(map->handle);
418                 if (master) {
419                         if (dev->sigdata.lock == master->lock.hw_lock)
420                                 dev->sigdata.lock = NULL;
421                         master->lock.hw_lock = NULL;   /* SHM removed */
422                         master->lock.file_priv = NULL;
423                         wake_up_interruptible(&master->lock.lock_queue);
424                 }
425                 break;
426         case _DRM_AGP:
427         case _DRM_SCATTER_GATHER:
428                 break;
429         case _DRM_CONSISTENT:
430                 dmah.vaddr = map->handle;
431                 dmah.busaddr = map->offset;
432                 dmah.size = map->size;
433                 __drm_pci_free(dev, &dmah);
434                 break;
435         case _DRM_GEM:
436                 DRM_ERROR("tried to rmmap GEM object\n");
437                 break;
438         }
439         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
440
441         return 0;
442 }
443 EXPORT_SYMBOL(drm_rmmap_locked);
444
445 int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
446 {
447         int ret;
448
449         mutex_lock(&dev->struct_mutex);
450         ret = drm_rmmap_locked(dev, map);
451         mutex_unlock(&dev->struct_mutex);
452
453         return ret;
454 }
455 EXPORT_SYMBOL(drm_rmmap);
456
457 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
458  * the last close of the device, and this is necessary for cleanup when things
459  * exit uncleanly.  Therefore, having userland manually remove mappings seems
460  * like a pointless exercise since they're going away anyway.
461  *
462  * One use case might be after addmap is allowed for normal users for SHM and
463  * gets used by drivers that the server doesn't need to care about.  This seems
464  * unlikely.
465  */
466 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
467                     struct drm_file *file_priv)
468 {
469         struct drm_map *request = data;
470         drm_local_map_t *map = NULL;
471         struct drm_map_list *r_list;
472         int ret;
473
474         mutex_lock(&dev->struct_mutex);
475         list_for_each_entry(r_list, &dev->maplist, head) {
476                 if (r_list->map &&
477                     r_list->user_token == (unsigned long)request->handle &&
478                     r_list->map->flags & _DRM_REMOVABLE) {
479                         map = r_list->map;
480                         break;
481                 }
482         }
483
484         /* List has wrapped around to the head pointer, or its empty we didn't
485          * find anything.
486          */
487         if (list_empty(&dev->maplist) || !map) {
488                 mutex_unlock(&dev->struct_mutex);
489                 return -EINVAL;
490         }
491
492         /* Register and framebuffer maps are permanent */
493         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
494                 mutex_unlock(&dev->struct_mutex);
495                 return 0;
496         }
497
498         ret = drm_rmmap_locked(dev, map);
499
500         mutex_unlock(&dev->struct_mutex);
501
502         return ret;
503 }
504
505 /**
506  * Cleanup after an error on one of the addbufs() functions.
507  *
508  * \param dev DRM device.
509  * \param entry buffer entry where the error occurred.
510  *
511  * Frees any pages and buffers associated with the given entry.
512  */
513 static void drm_cleanup_buf_error(struct drm_device * dev,
514                                   struct drm_buf_entry * entry)
515 {
516         int i;
517
518         if (entry->seg_count) {
519                 for (i = 0; i < entry->seg_count; i++) {
520                         if (entry->seglist[i]) {
521                                 drm_pci_free(dev, entry->seglist[i]);
522                         }
523                 }
524                 drm_free(entry->seglist,
525                          entry->seg_count *
526                          sizeof(*entry->seglist), DRM_MEM_SEGS);
527
528                 entry->seg_count = 0;
529         }
530
531         if (entry->buf_count) {
532                 for (i = 0; i < entry->buf_count; i++) {
533                         if (entry->buflist[i].dev_private) {
534                                 drm_free(entry->buflist[i].dev_private,
535                                          entry->buflist[i].dev_priv_size,
536                                          DRM_MEM_BUFS);
537                         }
538                 }
539                 drm_free(entry->buflist,
540                          entry->buf_count *
541                          sizeof(*entry->buflist), DRM_MEM_BUFS);
542
543                 entry->buf_count = 0;
544         }
545 }
546
547 #if __OS_HAS_AGP
548 /**
549  * Add AGP buffers for DMA transfers.
550  *
551  * \param dev struct drm_device to which the buffers are to be added.
552  * \param request pointer to a struct drm_buf_desc describing the request.
553  * \return zero on success or a negative number on failure.
554  *
555  * After some sanity checks creates a drm_buf structure for each buffer and
556  * reallocates the buffer list of the same size order to accommodate the new
557  * buffers.
558  */
559 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
560 {
561         struct drm_device_dma *dma = dev->dma;
562         struct drm_buf_entry *entry;
563         struct drm_agp_mem *agp_entry;
564         struct drm_buf *buf;
565         unsigned long offset;
566         unsigned long agp_offset;
567         int count;
568         int order;
569         int size;
570         int alignment;
571         int page_order;
572         int total;
573         int byte_count;
574         int i, valid;
575         struct drm_buf **temp_buflist;
576
577         if (!dma)
578                 return -EINVAL;
579
580         count = request->count;
581         order = drm_order(request->size);
582         size = 1 << order;
583
584         alignment = (request->flags & _DRM_PAGE_ALIGN)
585             ? PAGE_ALIGN(size) : size;
586         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
587         total = PAGE_SIZE << page_order;
588
589         byte_count = 0;
590         agp_offset = dev->agp->base + request->agp_start;
591
592         DRM_DEBUG("count:      %d\n", count);
593         DRM_DEBUG("order:      %d\n", order);
594         DRM_DEBUG("size:       %d\n", size);
595         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
596         DRM_DEBUG("alignment:  %d\n", alignment);
597         DRM_DEBUG("page_order: %d\n", page_order);
598         DRM_DEBUG("total:      %d\n", total);
599
600         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
601                 return -EINVAL;
602         if (dev->queue_count)
603                 return -EBUSY;  /* Not while in use */
604
605         /* Make sure buffers are located in AGP memory that we own */
606         valid = 0;
607         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
608                 if ((agp_offset >= agp_entry->bound) &&
609                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
610                         valid = 1;
611                         break;
612                 }
613         }
614         if (!list_empty(&dev->agp->memory) && !valid) {
615                 DRM_DEBUG("zone invalid\n");
616                 return -EINVAL;
617         }
618         spin_lock(&dev->count_lock);
619         if (dev->buf_use) {
620                 spin_unlock(&dev->count_lock);
621                 return -EBUSY;
622         }
623         atomic_inc(&dev->buf_alloc);
624         spin_unlock(&dev->count_lock);
625
626         mutex_lock(&dev->struct_mutex);
627         entry = &dma->bufs[order];
628         if (entry->buf_count) {
629                 mutex_unlock(&dev->struct_mutex);
630                 atomic_dec(&dev->buf_alloc);
631                 return -ENOMEM; /* May only call once for each order */
632         }
633
634         if (count < 0 || count > 4096) {
635                 mutex_unlock(&dev->struct_mutex);
636                 atomic_dec(&dev->buf_alloc);
637                 return -EINVAL;
638         }
639
640         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
641                                    DRM_MEM_BUFS);
642         if (!entry->buflist) {
643                 mutex_unlock(&dev->struct_mutex);
644                 atomic_dec(&dev->buf_alloc);
645                 return -ENOMEM;
646         }
647         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
648
649         entry->buf_size = size;
650         entry->page_order = page_order;
651
652         offset = 0;
653
654         while (entry->buf_count < count) {
655                 buf = &entry->buflist[entry->buf_count];
656                 buf->idx = dma->buf_count + entry->buf_count;
657                 buf->total = alignment;
658                 buf->order = order;
659                 buf->used = 0;
660
661                 buf->offset = (dma->byte_count + offset);
662                 buf->bus_address = agp_offset + offset;
663                 buf->address = (void *)(agp_offset + offset);
664                 buf->next = NULL;
665                 buf->waiting = 0;
666                 buf->pending = 0;
667                 init_waitqueue_head(&buf->dma_wait);
668                 buf->file_priv = NULL;
669
670                 buf->dev_priv_size = dev->driver->dev_priv_size;
671                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
672                 if (!buf->dev_private) {
673                         /* Set count correctly so we free the proper amount. */
674                         entry->buf_count = count;
675                         drm_cleanup_buf_error(dev, entry);
676                         mutex_unlock(&dev->struct_mutex);
677                         atomic_dec(&dev->buf_alloc);
678                         return -ENOMEM;
679                 }
680                 memset(buf->dev_private, 0, buf->dev_priv_size);
681
682                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
683
684                 offset += alignment;
685                 entry->buf_count++;
686                 byte_count += PAGE_SIZE << page_order;
687         }
688
689         DRM_DEBUG("byte_count: %d\n", byte_count);
690
691         temp_buflist = drm_realloc(dma->buflist,
692                                    dma->buf_count * sizeof(*dma->buflist),
693                                    (dma->buf_count + entry->buf_count)
694                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
695         if (!temp_buflist) {
696                 /* Free the entry because it isn't valid */
697                 drm_cleanup_buf_error(dev, entry);
698                 mutex_unlock(&dev->struct_mutex);
699                 atomic_dec(&dev->buf_alloc);
700                 return -ENOMEM;
701         }
702         dma->buflist = temp_buflist;
703
704         for (i = 0; i < entry->buf_count; i++) {
705                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
706         }
707
708         dma->buf_count += entry->buf_count;
709         dma->seg_count += entry->seg_count;
710         dma->page_count += byte_count >> PAGE_SHIFT;
711         dma->byte_count += byte_count;
712
713         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
714         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
715
716         mutex_unlock(&dev->struct_mutex);
717
718         request->count = entry->buf_count;
719         request->size = size;
720
721         dma->flags = _DRM_DMA_USE_AGP;
722
723         atomic_dec(&dev->buf_alloc);
724         return 0;
725 }
726 EXPORT_SYMBOL(drm_addbufs_agp);
727 #endif                          /* __OS_HAS_AGP */
728
729 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
730 {
731         struct drm_device_dma *dma = dev->dma;
732         int count;
733         int order;
734         int size;
735         int total;
736         int page_order;
737         struct drm_buf_entry *entry;
738         drm_dma_handle_t *dmah;
739         struct drm_buf *buf;
740         int alignment;
741         unsigned long offset;
742         int i;
743         int byte_count;
744         int page_count;
745         unsigned long *temp_pagelist;
746         struct drm_buf **temp_buflist;
747
748         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
749                 return -EINVAL;
750
751         if (!dma)
752                 return -EINVAL;
753
754         if (!capable(CAP_SYS_ADMIN))
755                 return -EPERM;
756
757         count = request->count;
758         order = drm_order(request->size);
759         size = 1 << order;
760
761         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
762                   request->count, request->size, size, order, dev->queue_count);
763
764         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
765                 return -EINVAL;
766         if (dev->queue_count)
767                 return -EBUSY;  /* Not while in use */
768
769         alignment = (request->flags & _DRM_PAGE_ALIGN)
770             ? PAGE_ALIGN(size) : size;
771         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
772         total = PAGE_SIZE << page_order;
773
774         spin_lock(&dev->count_lock);
775         if (dev->buf_use) {
776                 spin_unlock(&dev->count_lock);
777                 return -EBUSY;
778         }
779         atomic_inc(&dev->buf_alloc);
780         spin_unlock(&dev->count_lock);
781
782         mutex_lock(&dev->struct_mutex);
783         entry = &dma->bufs[order];
784         if (entry->buf_count) {
785                 mutex_unlock(&dev->struct_mutex);
786                 atomic_dec(&dev->buf_alloc);
787                 return -ENOMEM; /* May only call once for each order */
788         }
789
790         if (count < 0 || count > 4096) {
791                 mutex_unlock(&dev->struct_mutex);
792                 atomic_dec(&dev->buf_alloc);
793                 return -EINVAL;
794         }
795
796         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
797                                    DRM_MEM_BUFS);
798         if (!entry->buflist) {
799                 mutex_unlock(&dev->struct_mutex);
800                 atomic_dec(&dev->buf_alloc);
801                 return -ENOMEM;
802         }
803         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
804
805         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
806                                    DRM_MEM_SEGS);
807         if (!entry->seglist) {
808                 drm_free(entry->buflist,
809                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
810                 mutex_unlock(&dev->struct_mutex);
811                 atomic_dec(&dev->buf_alloc);
812                 return -ENOMEM;
813         }
814         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
815
816         /* Keep the original pagelist until we know all the allocations
817          * have succeeded
818          */
819         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
820                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
821         if (!temp_pagelist) {
822                 drm_free(entry->buflist,
823                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
824                 drm_free(entry->seglist,
825                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
826                 mutex_unlock(&dev->struct_mutex);
827                 atomic_dec(&dev->buf_alloc);
828                 return -ENOMEM;
829         }
830         memcpy(temp_pagelist,
831                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
832         DRM_DEBUG("pagelist: %d entries\n",
833                   dma->page_count + (count << page_order));
834
835         entry->buf_size = size;
836         entry->page_order = page_order;
837         byte_count = 0;
838         page_count = 0;
839
840         while (entry->buf_count < count) {
841
842                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
843
844                 if (!dmah) {
845                         /* Set count correctly so we free the proper amount. */
846                         entry->buf_count = count;
847                         entry->seg_count = count;
848                         drm_cleanup_buf_error(dev, entry);
849                         drm_free(temp_pagelist,
850                                  (dma->page_count + (count << page_order))
851                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
852                         mutex_unlock(&dev->struct_mutex);
853                         atomic_dec(&dev->buf_alloc);
854                         return -ENOMEM;
855                 }
856                 entry->seglist[entry->seg_count++] = dmah;
857                 for (i = 0; i < (1 << page_order); i++) {
858                         DRM_DEBUG("page %d @ 0x%08lx\n",
859                                   dma->page_count + page_count,
860                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
861                         temp_pagelist[dma->page_count + page_count++]
862                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
863                 }
864                 for (offset = 0;
865                      offset + size <= total && entry->buf_count < count;
866                      offset += alignment, ++entry->buf_count) {
867                         buf = &entry->buflist[entry->buf_count];
868                         buf->idx = dma->buf_count + entry->buf_count;
869                         buf->total = alignment;
870                         buf->order = order;
871                         buf->used = 0;
872                         buf->offset = (dma->byte_count + byte_count + offset);
873                         buf->address = (void *)(dmah->vaddr + offset);
874                         buf->bus_address = dmah->busaddr + offset;
875                         buf->next = NULL;
876                         buf->waiting = 0;
877                         buf->pending = 0;
878                         init_waitqueue_head(&buf->dma_wait);
879                         buf->file_priv = NULL;
880
881                         buf->dev_priv_size = dev->driver->dev_priv_size;
882                         buf->dev_private = drm_alloc(buf->dev_priv_size,
883                                                      DRM_MEM_BUFS);
884                         if (!buf->dev_private) {
885                                 /* Set count correctly so we free the proper amount. */
886                                 entry->buf_count = count;
887                                 entry->seg_count = count;
888                                 drm_cleanup_buf_error(dev, entry);
889                                 drm_free(temp_pagelist,
890                                          (dma->page_count +
891                                           (count << page_order))
892                                          * sizeof(*dma->pagelist),
893                                          DRM_MEM_PAGES);
894                                 mutex_unlock(&dev->struct_mutex);
895                                 atomic_dec(&dev->buf_alloc);
896                                 return -ENOMEM;
897                         }
898                         memset(buf->dev_private, 0, buf->dev_priv_size);
899
900                         DRM_DEBUG("buffer %d @ %p\n",
901                                   entry->buf_count, buf->address);
902                 }
903                 byte_count += PAGE_SIZE << page_order;
904         }
905
906         temp_buflist = drm_realloc(dma->buflist,
907                                    dma->buf_count * sizeof(*dma->buflist),
908                                    (dma->buf_count + entry->buf_count)
909                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
910         if (!temp_buflist) {
911                 /* Free the entry because it isn't valid */
912                 drm_cleanup_buf_error(dev, entry);
913                 drm_free(temp_pagelist,
914                          (dma->page_count + (count << page_order))
915                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
916                 mutex_unlock(&dev->struct_mutex);
917                 atomic_dec(&dev->buf_alloc);
918                 return -ENOMEM;
919         }
920         dma->buflist = temp_buflist;
921
922         for (i = 0; i < entry->buf_count; i++) {
923                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
924         }
925
926         /* No allocations failed, so now we can replace the orginal pagelist
927          * with the new one.
928          */
929         if (dma->page_count) {
930                 drm_free(dma->pagelist,
931                          dma->page_count * sizeof(*dma->pagelist),
932                          DRM_MEM_PAGES);
933         }
934         dma->pagelist = temp_pagelist;
935
936         dma->buf_count += entry->buf_count;
937         dma->seg_count += entry->seg_count;
938         dma->page_count += entry->seg_count << page_order;
939         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
940
941         mutex_unlock(&dev->struct_mutex);
942
943         request->count = entry->buf_count;
944         request->size = size;
945
946         if (request->flags & _DRM_PCI_BUFFER_RO)
947                 dma->flags = _DRM_DMA_USE_PCI_RO;
948
949         atomic_dec(&dev->buf_alloc);
950         return 0;
951
952 }
953 EXPORT_SYMBOL(drm_addbufs_pci);
954
955 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
956 {
957         struct drm_device_dma *dma = dev->dma;
958         struct drm_buf_entry *entry;
959         struct drm_buf *buf;
960         unsigned long offset;
961         unsigned long agp_offset;
962         int count;
963         int order;
964         int size;
965         int alignment;
966         int page_order;
967         int total;
968         int byte_count;
969         int i;
970         struct drm_buf **temp_buflist;
971
972         if (!drm_core_check_feature(dev, DRIVER_SG))
973                 return -EINVAL;
974
975         if (!dma)
976                 return -EINVAL;
977
978         if (!capable(CAP_SYS_ADMIN))
979                 return -EPERM;
980
981         count = request->count;
982         order = drm_order(request->size);
983         size = 1 << order;
984
985         alignment = (request->flags & _DRM_PAGE_ALIGN)
986             ? PAGE_ALIGN(size) : size;
987         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
988         total = PAGE_SIZE << page_order;
989
990         byte_count = 0;
991         agp_offset = request->agp_start;
992
993         DRM_DEBUG("count:      %d\n", count);
994         DRM_DEBUG("order:      %d\n", order);
995         DRM_DEBUG("size:       %d\n", size);
996         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
997         DRM_DEBUG("alignment:  %d\n", alignment);
998         DRM_DEBUG("page_order: %d\n", page_order);
999         DRM_DEBUG("total:      %d\n", total);
1000
1001         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1002                 return -EINVAL;
1003         if (dev->queue_count)
1004                 return -EBUSY;  /* Not while in use */
1005
1006         spin_lock(&dev->count_lock);
1007         if (dev->buf_use) {
1008                 spin_unlock(&dev->count_lock);
1009                 return -EBUSY;
1010         }
1011         atomic_inc(&dev->buf_alloc);
1012         spin_unlock(&dev->count_lock);
1013
1014         mutex_lock(&dev->struct_mutex);
1015         entry = &dma->bufs[order];
1016         if (entry->buf_count) {
1017                 mutex_unlock(&dev->struct_mutex);
1018                 atomic_dec(&dev->buf_alloc);
1019                 return -ENOMEM; /* May only call once for each order */
1020         }
1021
1022         if (count < 0 || count > 4096) {
1023                 mutex_unlock(&dev->struct_mutex);
1024                 atomic_dec(&dev->buf_alloc);
1025                 return -EINVAL;
1026         }
1027
1028         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1029                                    DRM_MEM_BUFS);
1030         if (!entry->buflist) {
1031                 mutex_unlock(&dev->struct_mutex);
1032                 atomic_dec(&dev->buf_alloc);
1033                 return -ENOMEM;
1034         }
1035         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1036
1037         entry->buf_size = size;
1038         entry->page_order = page_order;
1039
1040         offset = 0;
1041
1042         while (entry->buf_count < count) {
1043                 buf = &entry->buflist[entry->buf_count];
1044                 buf->idx = dma->buf_count + entry->buf_count;
1045                 buf->total = alignment;
1046                 buf->order = order;
1047                 buf->used = 0;
1048
1049                 buf->offset = (dma->byte_count + offset);
1050                 buf->bus_address = agp_offset + offset;
1051                 buf->address = (void *)(agp_offset + offset
1052                                         + (unsigned long)dev->sg->virtual);
1053                 buf->next = NULL;
1054                 buf->waiting = 0;
1055                 buf->pending = 0;
1056                 init_waitqueue_head(&buf->dma_wait);
1057                 buf->file_priv = NULL;
1058
1059                 buf->dev_priv_size = dev->driver->dev_priv_size;
1060                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1061                 if (!buf->dev_private) {
1062                         /* Set count correctly so we free the proper amount. */
1063                         entry->buf_count = count;
1064                         drm_cleanup_buf_error(dev, entry);
1065                         mutex_unlock(&dev->struct_mutex);
1066                         atomic_dec(&dev->buf_alloc);
1067                         return -ENOMEM;
1068                 }
1069
1070                 memset(buf->dev_private, 0, buf->dev_priv_size);
1071
1072                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1073
1074                 offset += alignment;
1075                 entry->buf_count++;
1076                 byte_count += PAGE_SIZE << page_order;
1077         }
1078
1079         DRM_DEBUG("byte_count: %d\n", byte_count);
1080
1081         temp_buflist = drm_realloc(dma->buflist,
1082                                    dma->buf_count * sizeof(*dma->buflist),
1083                                    (dma->buf_count + entry->buf_count)
1084                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1085         if (!temp_buflist) {
1086                 /* Free the entry because it isn't valid */
1087                 drm_cleanup_buf_error(dev, entry);
1088                 mutex_unlock(&dev->struct_mutex);
1089                 atomic_dec(&dev->buf_alloc);
1090                 return -ENOMEM;
1091         }
1092         dma->buflist = temp_buflist;
1093
1094         for (i = 0; i < entry->buf_count; i++) {
1095                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1096         }
1097
1098         dma->buf_count += entry->buf_count;
1099         dma->seg_count += entry->seg_count;
1100         dma->page_count += byte_count >> PAGE_SHIFT;
1101         dma->byte_count += byte_count;
1102
1103         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1104         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1105
1106         mutex_unlock(&dev->struct_mutex);
1107
1108         request->count = entry->buf_count;
1109         request->size = size;
1110
1111         dma->flags = _DRM_DMA_USE_SG;
1112
1113         atomic_dec(&dev->buf_alloc);
1114         return 0;
1115 }
1116
1117 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1118 {
1119         struct drm_device_dma *dma = dev->dma;
1120         struct drm_buf_entry *entry;
1121         struct drm_buf *buf;
1122         unsigned long offset;
1123         unsigned long agp_offset;
1124         int count;
1125         int order;
1126         int size;
1127         int alignment;
1128         int page_order;
1129         int total;
1130         int byte_count;
1131         int i;
1132         struct drm_buf **temp_buflist;
1133
1134         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1135                 return -EINVAL;
1136
1137         if (!dma)
1138                 return -EINVAL;
1139
1140         if (!capable(CAP_SYS_ADMIN))
1141                 return -EPERM;
1142
1143         count = request->count;
1144         order = drm_order(request->size);
1145         size = 1 << order;
1146
1147         alignment = (request->flags & _DRM_PAGE_ALIGN)
1148             ? PAGE_ALIGN(size) : size;
1149         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1150         total = PAGE_SIZE << page_order;
1151
1152         byte_count = 0;
1153         agp_offset = request->agp_start;
1154
1155         DRM_DEBUG("count:      %d\n", count);
1156         DRM_DEBUG("order:      %d\n", order);
1157         DRM_DEBUG("size:       %d\n", size);
1158         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1159         DRM_DEBUG("alignment:  %d\n", alignment);
1160         DRM_DEBUG("page_order: %d\n", page_order);
1161         DRM_DEBUG("total:      %d\n", total);
1162
1163         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1164                 return -EINVAL;
1165         if (dev->queue_count)
1166                 return -EBUSY;  /* Not while in use */
1167
1168         spin_lock(&dev->count_lock);
1169         if (dev->buf_use) {
1170                 spin_unlock(&dev->count_lock);
1171                 return -EBUSY;
1172         }
1173         atomic_inc(&dev->buf_alloc);
1174         spin_unlock(&dev->count_lock);
1175
1176         mutex_lock(&dev->struct_mutex);
1177         entry = &dma->bufs[order];
1178         if (entry->buf_count) {
1179                 mutex_unlock(&dev->struct_mutex);
1180                 atomic_dec(&dev->buf_alloc);
1181                 return -ENOMEM; /* May only call once for each order */
1182         }
1183
1184         if (count < 0 || count > 4096) {
1185                 mutex_unlock(&dev->struct_mutex);
1186                 atomic_dec(&dev->buf_alloc);
1187                 return -EINVAL;
1188         }
1189
1190         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1191                                    DRM_MEM_BUFS);
1192         if (!entry->buflist) {
1193                 mutex_unlock(&dev->struct_mutex);
1194                 atomic_dec(&dev->buf_alloc);
1195                 return -ENOMEM;
1196         }
1197         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1198
1199         entry->buf_size = size;
1200         entry->page_order = page_order;
1201
1202         offset = 0;
1203
1204         while (entry->buf_count < count) {
1205                 buf = &entry->buflist[entry->buf_count];
1206                 buf->idx = dma->buf_count + entry->buf_count;
1207                 buf->total = alignment;
1208                 buf->order = order;
1209                 buf->used = 0;
1210
1211                 buf->offset = (dma->byte_count + offset);
1212                 buf->bus_address = agp_offset + offset;
1213                 buf->address = (void *)(agp_offset + offset);
1214                 buf->next = NULL;
1215                 buf->waiting = 0;
1216                 buf->pending = 0;
1217                 init_waitqueue_head(&buf->dma_wait);
1218                 buf->file_priv = NULL;
1219
1220                 buf->dev_priv_size = dev->driver->dev_priv_size;
1221                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1222                 if (!buf->dev_private) {
1223                         /* Set count correctly so we free the proper amount. */
1224                         entry->buf_count = count;
1225                         drm_cleanup_buf_error(dev, entry);
1226                         mutex_unlock(&dev->struct_mutex);
1227                         atomic_dec(&dev->buf_alloc);
1228                         return -ENOMEM;
1229                 }
1230                 memset(buf->dev_private, 0, buf->dev_priv_size);
1231
1232                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1233
1234                 offset += alignment;
1235                 entry->buf_count++;
1236                 byte_count += PAGE_SIZE << page_order;
1237         }
1238
1239         DRM_DEBUG("byte_count: %d\n", byte_count);
1240
1241         temp_buflist = drm_realloc(dma->buflist,
1242                                    dma->buf_count * sizeof(*dma->buflist),
1243                                    (dma->buf_count + entry->buf_count)
1244                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1245         if (!temp_buflist) {
1246                 /* Free the entry because it isn't valid */
1247                 drm_cleanup_buf_error(dev, entry);
1248                 mutex_unlock(&dev->struct_mutex);
1249                 atomic_dec(&dev->buf_alloc);
1250                 return -ENOMEM;
1251         }
1252         dma->buflist = temp_buflist;
1253
1254         for (i = 0; i < entry->buf_count; i++) {
1255                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1256         }
1257
1258         dma->buf_count += entry->buf_count;
1259         dma->seg_count += entry->seg_count;
1260         dma->page_count += byte_count >> PAGE_SHIFT;
1261         dma->byte_count += byte_count;
1262
1263         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1264         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1265
1266         mutex_unlock(&dev->struct_mutex);
1267
1268         request->count = entry->buf_count;
1269         request->size = size;
1270
1271         dma->flags = _DRM_DMA_USE_FB;
1272
1273         atomic_dec(&dev->buf_alloc);
1274         return 0;
1275 }
1276
1277
1278 /**
1279  * Add buffers for DMA transfers (ioctl).
1280  *
1281  * \param inode device inode.
1282  * \param file_priv DRM file private.
1283  * \param cmd command.
1284  * \param arg pointer to a struct drm_buf_desc request.
1285  * \return zero on success or a negative number on failure.
1286  *
1287  * According with the memory type specified in drm_buf_desc::flags and the
1288  * build options, it dispatches the call either to addbufs_agp(),
1289  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1290  * PCI memory respectively.
1291  */
1292 int drm_addbufs(struct drm_device *dev, void *data,
1293                 struct drm_file *file_priv)
1294 {
1295         struct drm_buf_desc *request = data;
1296         int ret;
1297
1298         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1299                 return -EINVAL;
1300
1301 #if __OS_HAS_AGP
1302         if (request->flags & _DRM_AGP_BUFFER)
1303                 ret = drm_addbufs_agp(dev, request);
1304         else
1305 #endif
1306         if (request->flags & _DRM_SG_BUFFER)
1307                 ret = drm_addbufs_sg(dev, request);
1308         else if (request->flags & _DRM_FB_BUFFER)
1309                 ret = drm_addbufs_fb(dev, request);
1310         else
1311                 ret = drm_addbufs_pci(dev, request);
1312
1313         return ret;
1314 }
1315
1316 /**
1317  * Get information about the buffer mappings.
1318  *
1319  * This was originally mean for debugging purposes, or by a sophisticated
1320  * client library to determine how best to use the available buffers (e.g.,
1321  * large buffers can be used for image transfer).
1322  *
1323  * \param inode device inode.
1324  * \param file_priv DRM file private.
1325  * \param cmd command.
1326  * \param arg pointer to a drm_buf_info structure.
1327  * \return zero on success or a negative number on failure.
1328  *
1329  * Increments drm_device::buf_use while holding the drm_device::count_lock
1330  * lock, preventing of allocating more buffers after this call. Information
1331  * about each requested buffer is then copied into user space.
1332  */
1333 int drm_infobufs(struct drm_device *dev, void *data,
1334                  struct drm_file *file_priv)
1335 {
1336         struct drm_device_dma *dma = dev->dma;
1337         struct drm_buf_info *request = data;
1338         int i;
1339         int count;
1340
1341         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1342                 return -EINVAL;
1343
1344         if (!dma)
1345                 return -EINVAL;
1346
1347         spin_lock(&dev->count_lock);
1348         if (atomic_read(&dev->buf_alloc)) {
1349                 spin_unlock(&dev->count_lock);
1350                 return -EBUSY;
1351         }
1352         ++dev->buf_use;         /* Can't allocate more after this call */
1353         spin_unlock(&dev->count_lock);
1354
1355         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1356                 if (dma->bufs[i].buf_count)
1357                         ++count;
1358         }
1359
1360         DRM_DEBUG("count = %d\n", count);
1361
1362         if (request->count >= count) {
1363                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1364                         if (dma->bufs[i].buf_count) {
1365                                 struct drm_buf_desc __user *to =
1366                                     &request->list[count];
1367                                 struct drm_buf_entry *from = &dma->bufs[i];
1368                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1369                                 if (copy_to_user(&to->count,
1370                                                  &from->buf_count,
1371                                                  sizeof(from->buf_count)) ||
1372                                     copy_to_user(&to->size,
1373                                                  &from->buf_size,
1374                                                  sizeof(from->buf_size)) ||
1375                                     copy_to_user(&to->low_mark,
1376                                                  &list->low_mark,
1377                                                  sizeof(list->low_mark)) ||
1378                                     copy_to_user(&to->high_mark,
1379                                                  &list->high_mark,
1380                                                  sizeof(list->high_mark)))
1381                                         return -EFAULT;
1382
1383                                 DRM_DEBUG("%d %d %d %d %d\n",
1384                                           i,
1385                                           dma->bufs[i].buf_count,
1386                                           dma->bufs[i].buf_size,
1387                                           dma->bufs[i].freelist.low_mark,
1388                                           dma->bufs[i].freelist.high_mark);
1389                                 ++count;
1390                         }
1391                 }
1392         }
1393         request->count = count;
1394
1395         return 0;
1396 }
1397
1398 /**
1399  * Specifies a low and high water mark for buffer allocation
1400  *
1401  * \param inode device inode.
1402  * \param file_priv DRM file private.
1403  * \param cmd command.
1404  * \param arg a pointer to a drm_buf_desc structure.
1405  * \return zero on success or a negative number on failure.
1406  *
1407  * Verifies that the size order is bounded between the admissible orders and
1408  * updates the respective drm_device_dma::bufs entry low and high water mark.
1409  *
1410  * \note This ioctl is deprecated and mostly never used.
1411  */
1412 int drm_markbufs(struct drm_device *dev, void *data,
1413                  struct drm_file *file_priv)
1414 {
1415         struct drm_device_dma *dma = dev->dma;
1416         struct drm_buf_desc *request = data;
1417         int order;
1418         struct drm_buf_entry *entry;
1419
1420         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1421                 return -EINVAL;
1422
1423         if (!dma)
1424                 return -EINVAL;
1425
1426         DRM_DEBUG("%d, %d, %d\n",
1427                   request->size, request->low_mark, request->high_mark);
1428         order = drm_order(request->size);
1429         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1430                 return -EINVAL;
1431         entry = &dma->bufs[order];
1432
1433         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1434                 return -EINVAL;
1435         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1436                 return -EINVAL;
1437
1438         entry->freelist.low_mark = request->low_mark;
1439         entry->freelist.high_mark = request->high_mark;
1440
1441         return 0;
1442 }
1443
1444 /**
1445  * Unreserve the buffers in list, previously reserved using drmDMA.
1446  *
1447  * \param inode device inode.
1448  * \param file_priv DRM file private.
1449  * \param cmd command.
1450  * \param arg pointer to a drm_buf_free structure.
1451  * \return zero on success or a negative number on failure.
1452  *
1453  * Calls free_buffer() for each used buffer.
1454  * This function is primarily used for debugging.
1455  */
1456 int drm_freebufs(struct drm_device *dev, void *data,
1457                  struct drm_file *file_priv)
1458 {
1459         struct drm_device_dma *dma = dev->dma;
1460         struct drm_buf_free *request = data;
1461         int i;
1462         int idx;
1463         struct drm_buf *buf;
1464
1465         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1466                 return -EINVAL;
1467
1468         if (!dma)
1469                 return -EINVAL;
1470
1471         DRM_DEBUG("%d\n", request->count);
1472         for (i = 0; i < request->count; i++) {
1473                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1474                         return -EFAULT;
1475                 if (idx < 0 || idx >= dma->buf_count) {
1476                         DRM_ERROR("Index %d (of %d max)\n",
1477                                   idx, dma->buf_count - 1);
1478                         return -EINVAL;
1479                 }
1480                 buf = dma->buflist[idx];
1481                 if (buf->file_priv != file_priv) {
1482                         DRM_ERROR("Process %d freeing buffer not owned\n",
1483                                   task_pid_nr(current));
1484                         return -EINVAL;
1485                 }
1486                 drm_free_buffer(dev, buf);
1487         }
1488
1489         return 0;
1490 }
1491
1492 /**
1493  * Maps all of the DMA buffers into client-virtual space (ioctl).
1494  *
1495  * \param inode device inode.
1496  * \param file_priv DRM file private.
1497  * \param cmd command.
1498  * \param arg pointer to a drm_buf_map structure.
1499  * \return zero on success or a negative number on failure.
1500  *
1501  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1502  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1503  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1504  * drm_mmap_dma().
1505  */
1506 int drm_mapbufs(struct drm_device *dev, void *data,
1507                 struct drm_file *file_priv)
1508 {
1509         struct drm_device_dma *dma = dev->dma;
1510         int retcode = 0;
1511         const int zero = 0;
1512         unsigned long virtual;
1513         unsigned long address;
1514         struct drm_buf_map *request = data;
1515         int i;
1516
1517         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1518                 return -EINVAL;
1519
1520         if (!dma)
1521                 return -EINVAL;
1522
1523         spin_lock(&dev->count_lock);
1524         if (atomic_read(&dev->buf_alloc)) {
1525                 spin_unlock(&dev->count_lock);
1526                 return -EBUSY;
1527         }
1528         dev->buf_use++;         /* Can't allocate more after this call */
1529         spin_unlock(&dev->count_lock);
1530
1531         if (request->count >= dma->buf_count) {
1532                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1533                     || (drm_core_check_feature(dev, DRIVER_SG)
1534                         && (dma->flags & _DRM_DMA_USE_SG))
1535                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1536                         && (dma->flags & _DRM_DMA_USE_FB))) {
1537                         struct drm_map *map = dev->agp_buffer_map;
1538                         unsigned long token = dev->agp_buffer_token;
1539
1540                         if (!map) {
1541                                 retcode = -EINVAL;
1542                                 goto done;
1543                         }
1544                         down_write(&current->mm->mmap_sem);
1545                         virtual = do_mmap(file_priv->filp, 0, map->size,
1546                                           PROT_READ | PROT_WRITE,
1547                                           MAP_SHARED,
1548                                           token);
1549                         up_write(&current->mm->mmap_sem);
1550                 } else {
1551                         down_write(&current->mm->mmap_sem);
1552                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1553                                           PROT_READ | PROT_WRITE,
1554                                           MAP_SHARED, 0);
1555                         up_write(&current->mm->mmap_sem);
1556                 }
1557                 if (virtual > -1024UL) {
1558                         /* Real error */
1559                         retcode = (signed long)virtual;
1560                         goto done;
1561                 }
1562                 request->virtual = (void __user *)virtual;
1563
1564                 for (i = 0; i < dma->buf_count; i++) {
1565                         if (copy_to_user(&request->list[i].idx,
1566                                          &dma->buflist[i]->idx,
1567                                          sizeof(request->list[0].idx))) {
1568                                 retcode = -EFAULT;
1569                                 goto done;
1570                         }
1571                         if (copy_to_user(&request->list[i].total,
1572                                          &dma->buflist[i]->total,
1573                                          sizeof(request->list[0].total))) {
1574                                 retcode = -EFAULT;
1575                                 goto done;
1576                         }
1577                         if (copy_to_user(&request->list[i].used,
1578                                          &zero, sizeof(zero))) {
1579                                 retcode = -EFAULT;
1580                                 goto done;
1581                         }
1582                         address = virtual + dma->buflist[i]->offset;    /* *** */
1583                         if (copy_to_user(&request->list[i].address,
1584                                          &address, sizeof(address))) {
1585                                 retcode = -EFAULT;
1586                                 goto done;
1587                         }
1588                 }
1589         }
1590       done:
1591         request->count = dma->buf_count;
1592         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1593
1594         return retcode;
1595 }
1596
1597 /**
1598  * Compute size order.  Returns the exponent of the smaller power of two which
1599  * is greater or equal to given number.
1600  *
1601  * \param size size.
1602  * \return order.
1603  *
1604  * \todo Can be made faster.
1605  */
1606 int drm_order(unsigned long size)
1607 {
1608         int order;
1609         unsigned long tmp;
1610
1611         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1612
1613         if (size & (size - 1))
1614                 ++order;
1615
1616         return order;
1617 }
1618 EXPORT_SYMBOL(drm_order);