Revert "drm: don't associate _DRM_DRIVER maps with a master"
[sfrench/cifs-2.6.git] / 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 <linux/log2.h>
38 #include <asm/shmparam.h>
39 #include "drmP.h"
40
41 resource_size_t drm_get_resource_start(struct drm_device *dev, unsigned int resource)
42 {
43         return pci_resource_start(dev->pdev, resource);
44 }
45 EXPORT_SYMBOL(drm_get_resource_start);
46
47 resource_size_t drm_get_resource_len(struct drm_device *dev, unsigned int resource)
48 {
49         return pci_resource_len(dev->pdev, resource);
50 }
51
52 EXPORT_SYMBOL(drm_get_resource_len);
53
54 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
55                                                   struct drm_local_map *map)
56 {
57         struct drm_map_list *entry;
58         list_for_each_entry(entry, &dev->maplist, head) {
59                 /*
60                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
61                  * while PCI resources may live above that, we ignore the map
62                  * offset for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.
63                  * It is assumed that each driver will have only one resource of
64                  * each type.
65                  */
66                 if (!entry->map ||
67                     map->type != entry->map->type ||
68                     entry->master != dev->primary->master)
69                         continue;
70                 switch (map->type) {
71                 case _DRM_SHM:
72                         if (map->flags != _DRM_CONTAINS_LOCK)
73                                 break;
74                 case _DRM_REGISTERS:
75                 case _DRM_FRAME_BUFFER:
76                         return entry;
77                 default: /* Make gcc happy */
78                         ;
79                 }
80                 if (entry->map->offset == map->offset)
81                         return entry;
82         }
83
84         return NULL;
85 }
86
87 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
88                           unsigned long user_token, int hashed_handle, int shm)
89 {
90         int use_hashed_handle, shift;
91         unsigned long add;
92
93 #if (BITS_PER_LONG == 64)
94         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
95 #elif (BITS_PER_LONG == 32)
96         use_hashed_handle = hashed_handle;
97 #else
98 #error Unsupported long size. Neither 64 nor 32 bits.
99 #endif
100
101         if (!use_hashed_handle) {
102                 int ret;
103                 hash->key = user_token >> PAGE_SHIFT;
104                 ret = drm_ht_insert_item(&dev->map_hash, hash);
105                 if (ret != -EINVAL)
106                         return ret;
107         }
108
109         shift = 0;
110         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
111         if (shm && (SHMLBA > PAGE_SIZE)) {
112                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
113
114                 /* For shared memory, we have to preserve the SHMLBA
115                  * bits of the eventual vma->vm_pgoff value during
116                  * mmap().  Otherwise we run into cache aliasing problems
117                  * on some platforms.  On these platforms, the pgoff of
118                  * a mmap() request is used to pick a suitable virtual
119                  * address for the mmap() region such that it will not
120                  * cause cache aliasing problems.
121                  *
122                  * Therefore, make sure the SHMLBA relevant bits of the
123                  * hash value we use are equal to those in the original
124                  * kernel virtual address.
125                  */
126                 shift = bits;
127                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
128         }
129
130         return drm_ht_just_insert_please(&dev->map_hash, hash,
131                                          user_token, 32 - PAGE_SHIFT - 3,
132                                          shift, add);
133 }
134
135 /**
136  * Core function to create a range of memory available for mapping by a
137  * non-root process.
138  *
139  * Adjusts the memory offset to its absolute value according to the mapping
140  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
141  * applicable and if supported by the kernel.
142  */
143 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
144                            unsigned int size, enum drm_map_type type,
145                            enum drm_map_flags flags,
146                            struct drm_map_list ** maplist)
147 {
148         struct drm_local_map *map;
149         struct drm_map_list *list;
150         drm_dma_handle_t *dmah;
151         unsigned long user_token;
152         int ret;
153
154         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
155         if (!map)
156                 return -ENOMEM;
157
158         map->offset = offset;
159         map->size = size;
160         map->flags = flags;
161         map->type = type;
162
163         /* Only allow shared memory to be removable since we only keep enough
164          * book keeping information about shared memory to allow for removal
165          * when processes fork.
166          */
167         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
168                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
169                 return -EINVAL;
170         }
171         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
172                   (unsigned long long)map->offset, map->size, map->type);
173
174         /* page-align _DRM_SHM maps. They are allocated here so there is no security
175          * hole created by that and it works around various broken drivers that use
176          * a non-aligned quantity to map the SAREA. --BenH
177          */
178         if (map->type == _DRM_SHM)
179                 map->size = PAGE_ALIGN(map->size);
180
181         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
182                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
183                 return -EINVAL;
184         }
185         map->mtrr = -1;
186         map->handle = NULL;
187
188         switch (map->type) {
189         case _DRM_REGISTERS:
190         case _DRM_FRAME_BUFFER:
191 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
192                 if (map->offset + (map->size-1) < map->offset ||
193                     map->offset < virt_to_phys(high_memory)) {
194                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
195                         return -EINVAL;
196                 }
197 #endif
198 #ifdef __alpha__
199                 map->offset += dev->hose->mem_space->start;
200 #endif
201                 /* Some drivers preinitialize some maps, without the X Server
202                  * needing to be aware of it.  Therefore, we just return success
203                  * when the server tries to create a duplicate map.
204                  */
205                 list = drm_find_matching_map(dev, map);
206                 if (list != NULL) {
207                         if (list->map->size != map->size) {
208                                 DRM_DEBUG("Matching maps of type %d with "
209                                           "mismatched sizes, (%ld vs %ld)\n",
210                                           map->type, map->size,
211                                           list->map->size);
212                                 list->map->size = map->size;
213                         }
214
215                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
216                         *maplist = list;
217                         return 0;
218                 }
219
220                 if (drm_core_has_MTRR(dev)) {
221                         if (map->type == _DRM_FRAME_BUFFER ||
222                             (map->flags & _DRM_WRITE_COMBINING)) {
223                                 map->mtrr = mtrr_add(map->offset, map->size,
224                                                      MTRR_TYPE_WRCOMB, 1);
225                         }
226                 }
227                 if (map->type == _DRM_REGISTERS) {
228                         map->handle = ioremap(map->offset, map->size);
229                         if (!map->handle) {
230                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
231                                 return -ENOMEM;
232                         }
233                 }
234
235                 break;
236         case _DRM_SHM:
237                 list = drm_find_matching_map(dev, map);
238                 if (list != NULL) {
239                         if(list->map->size != map->size) {
240                                 DRM_DEBUG("Matching maps of type %d with "
241                                           "mismatched sizes, (%ld vs %ld)\n",
242                                           map->type, map->size, list->map->size);
243                                 list->map->size = map->size;
244                         }
245
246                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
247                         *maplist = list;
248                         return 0;
249                 }
250                 map->handle = vmalloc_user(map->size);
251                 DRM_DEBUG("%lu %d %p\n",
252                           map->size, drm_order(map->size), map->handle);
253                 if (!map->handle) {
254                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
255                         return -ENOMEM;
256                 }
257                 map->offset = (unsigned long)map->handle;
258                 if (map->flags & _DRM_CONTAINS_LOCK) {
259                         /* Prevent a 2nd X Server from creating a 2nd lock */
260                         if (dev->primary->master->lock.hw_lock != NULL) {
261                                 vfree(map->handle);
262                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
263                                 return -EBUSY;
264                         }
265                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
266                 }
267                 break;
268         case _DRM_AGP: {
269                 struct drm_agp_mem *entry;
270                 int valid = 0;
271
272                 if (!drm_core_has_AGP(dev)) {
273                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
274                         return -EINVAL;
275                 }
276 #ifdef __alpha__
277                 map->offset += dev->hose->mem_space->start;
278 #endif
279                 /* In some cases (i810 driver), user space may have already
280                  * added the AGP base itself, because dev->agp->base previously
281                  * only got set during AGP enable.  So, only add the base
282                  * address if the map's offset isn't already within the
283                  * aperture.
284                  */
285                 if (map->offset < dev->agp->base ||
286                     map->offset > dev->agp->base +
287                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
288                         map->offset += dev->agp->base;
289                 }
290                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
291
292                 /* This assumes the DRM is in total control of AGP space.
293                  * It's not always the case as AGP can be in the control
294                  * of user space (i.e. i810 driver). So this loop will get
295                  * skipped and we double check that dev->agp->memory is
296                  * actually set as well as being invalid before EPERM'ing
297                  */
298                 list_for_each_entry(entry, &dev->agp->memory, head) {
299                         if ((map->offset >= entry->bound) &&
300                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
301                                 valid = 1;
302                                 break;
303                         }
304                 }
305                 if (!list_empty(&dev->agp->memory) && !valid) {
306                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
307                         return -EPERM;
308                 }
309                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
310                           (unsigned long long)map->offset, map->size);
311
312                 break;
313         case _DRM_GEM:
314                 DRM_ERROR("tried to rmmap GEM object\n");
315                 break;
316         }
317         case _DRM_SCATTER_GATHER:
318                 if (!dev->sg) {
319                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
320                         return -EINVAL;
321                 }
322                 map->offset += (unsigned long)dev->sg->virtual;
323                 break;
324         case _DRM_CONSISTENT:
325                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
326                  * As we're limiting the address to 2^32-1 (or less),
327                  * casting it down to 32 bits is no problem, but we
328                  * need to point to a 64bit variable first. */
329                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
330                 if (!dmah) {
331                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
332                         return -ENOMEM;
333                 }
334                 map->handle = dmah->vaddr;
335                 map->offset = (unsigned long)dmah->busaddr;
336                 kfree(dmah);
337                 break;
338         default:
339                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
340                 return -EINVAL;
341         }
342
343         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
344         if (!list) {
345                 if (map->type == _DRM_REGISTERS)
346                         iounmap(map->handle);
347                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
348                 return -EINVAL;
349         }
350         memset(list, 0, sizeof(*list));
351         list->map = map;
352
353         mutex_lock(&dev->struct_mutex);
354         list_add(&list->head, &dev->maplist);
355
356         /* Assign a 32-bit handle */
357         /* We do it here so that dev->struct_mutex protects the increment */
358         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
359                 map->offset;
360         ret = drm_map_handle(dev, &list->hash, user_token, 0,
361                              (map->type == _DRM_SHM));
362         if (ret) {
363                 if (map->type == _DRM_REGISTERS)
364                         iounmap(map->handle);
365                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
366                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
367                 mutex_unlock(&dev->struct_mutex);
368                 return ret;
369         }
370
371         list->user_token = list->hash.key << PAGE_SHIFT;
372         mutex_unlock(&dev->struct_mutex);
373
374         list->master = dev->primary->master;
375         *maplist = list;
376         return 0;
377         }
378
379 int drm_addmap(struct drm_device * dev, resource_size_t offset,
380                unsigned int size, enum drm_map_type type,
381                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
382 {
383         struct drm_map_list *list;
384         int rc;
385
386         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
387         if (!rc)
388                 *map_ptr = list->map;
389         return rc;
390 }
391
392 EXPORT_SYMBOL(drm_addmap);
393
394 /**
395  * Ioctl to specify a range of memory that is available for mapping by a
396  * non-root process.
397  *
398  * \param inode device inode.
399  * \param file_priv DRM file private.
400  * \param cmd command.
401  * \param arg pointer to a drm_map structure.
402  * \return zero on success or a negative value on error.
403  *
404  */
405 int drm_addmap_ioctl(struct drm_device *dev, void *data,
406                      struct drm_file *file_priv)
407 {
408         struct drm_map *map = data;
409         struct drm_map_list *maplist;
410         int err;
411
412         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
413                 return -EPERM;
414
415         err = drm_addmap_core(dev, map->offset, map->size, map->type,
416                               map->flags, &maplist);
417
418         if (err)
419                 return err;
420
421         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
422         map->handle = (void *)(unsigned long)maplist->user_token;
423         return 0;
424 }
425
426 /**
427  * Remove a map private from list and deallocate resources if the mapping
428  * isn't in use.
429  *
430  * Searches the map on drm_device::maplist, removes it from the list, see if
431  * its being used, and free any associate resource (such as MTRR's) if it's not
432  * being on use.
433  *
434  * \sa drm_addmap
435  */
436 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
437 {
438         struct drm_map_list *r_list = NULL, *list_t;
439         drm_dma_handle_t dmah;
440         int found = 0;
441         struct drm_master *master;
442
443         /* Find the list entry for the map and remove it */
444         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
445                 if (r_list->map == map) {
446                         master = r_list->master;
447                         list_del(&r_list->head);
448                         drm_ht_remove_key(&dev->map_hash,
449                                           r_list->user_token >> PAGE_SHIFT);
450                         drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
451                         found = 1;
452                         break;
453                 }
454         }
455
456         if (!found)
457                 return -EINVAL;
458
459         switch (map->type) {
460         case _DRM_REGISTERS:
461                 iounmap(map->handle);
462                 /* FALLTHROUGH */
463         case _DRM_FRAME_BUFFER:
464                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
465                         int retcode;
466                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
467                         DRM_DEBUG("mtrr_del=%d\n", retcode);
468                 }
469                 break;
470         case _DRM_SHM:
471                 vfree(map->handle);
472                 if (master) {
473                         if (dev->sigdata.lock == master->lock.hw_lock)
474                                 dev->sigdata.lock = NULL;
475                         master->lock.hw_lock = NULL;   /* SHM removed */
476                         master->lock.file_priv = NULL;
477                         wake_up_interruptible_all(&master->lock.lock_queue);
478                 }
479                 break;
480         case _DRM_AGP:
481         case _DRM_SCATTER_GATHER:
482                 break;
483         case _DRM_CONSISTENT:
484                 dmah.vaddr = map->handle;
485                 dmah.busaddr = map->offset;
486                 dmah.size = map->size;
487                 __drm_pci_free(dev, &dmah);
488                 break;
489         case _DRM_GEM:
490                 DRM_ERROR("tried to rmmap GEM object\n");
491                 break;
492         }
493         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
494
495         return 0;
496 }
497 EXPORT_SYMBOL(drm_rmmap_locked);
498
499 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
500 {
501         int ret;
502
503         mutex_lock(&dev->struct_mutex);
504         ret = drm_rmmap_locked(dev, map);
505         mutex_unlock(&dev->struct_mutex);
506
507         return ret;
508 }
509 EXPORT_SYMBOL(drm_rmmap);
510
511 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
512  * the last close of the device, and this is necessary for cleanup when things
513  * exit uncleanly.  Therefore, having userland manually remove mappings seems
514  * like a pointless exercise since they're going away anyway.
515  *
516  * One use case might be after addmap is allowed for normal users for SHM and
517  * gets used by drivers that the server doesn't need to care about.  This seems
518  * unlikely.
519  *
520  * \param inode device inode.
521  * \param file_priv DRM file private.
522  * \param cmd command.
523  * \param arg pointer to a struct drm_map structure.
524  * \return zero on success or a negative value on error.
525  */
526 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
527                     struct drm_file *file_priv)
528 {
529         struct drm_map *request = data;
530         struct drm_local_map *map = NULL;
531         struct drm_map_list *r_list;
532         int ret;
533
534         mutex_lock(&dev->struct_mutex);
535         list_for_each_entry(r_list, &dev->maplist, head) {
536                 if (r_list->map &&
537                     r_list->user_token == (unsigned long)request->handle &&
538                     r_list->map->flags & _DRM_REMOVABLE) {
539                         map = r_list->map;
540                         break;
541                 }
542         }
543
544         /* List has wrapped around to the head pointer, or its empty we didn't
545          * find anything.
546          */
547         if (list_empty(&dev->maplist) || !map) {
548                 mutex_unlock(&dev->struct_mutex);
549                 return -EINVAL;
550         }
551
552         /* Register and framebuffer maps are permanent */
553         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
554                 mutex_unlock(&dev->struct_mutex);
555                 return 0;
556         }
557
558         ret = drm_rmmap_locked(dev, map);
559
560         mutex_unlock(&dev->struct_mutex);
561
562         return ret;
563 }
564
565 /**
566  * Cleanup after an error on one of the addbufs() functions.
567  *
568  * \param dev DRM device.
569  * \param entry buffer entry where the error occurred.
570  *
571  * Frees any pages and buffers associated with the given entry.
572  */
573 static void drm_cleanup_buf_error(struct drm_device * dev,
574                                   struct drm_buf_entry * entry)
575 {
576         int i;
577
578         if (entry->seg_count) {
579                 for (i = 0; i < entry->seg_count; i++) {
580                         if (entry->seglist[i]) {
581                                 drm_pci_free(dev, entry->seglist[i]);
582                         }
583                 }
584                 drm_free(entry->seglist,
585                          entry->seg_count *
586                          sizeof(*entry->seglist), DRM_MEM_SEGS);
587
588                 entry->seg_count = 0;
589         }
590
591         if (entry->buf_count) {
592                 for (i = 0; i < entry->buf_count; i++) {
593                         if (entry->buflist[i].dev_private) {
594                                 drm_free(entry->buflist[i].dev_private,
595                                          entry->buflist[i].dev_priv_size,
596                                          DRM_MEM_BUFS);
597                         }
598                 }
599                 drm_free(entry->buflist,
600                          entry->buf_count *
601                          sizeof(*entry->buflist), DRM_MEM_BUFS);
602
603                 entry->buf_count = 0;
604         }
605 }
606
607 #if __OS_HAS_AGP
608 /**
609  * Add AGP buffers for DMA transfers.
610  *
611  * \param dev struct drm_device to which the buffers are to be added.
612  * \param request pointer to a struct drm_buf_desc describing the request.
613  * \return zero on success or a negative number on failure.
614  *
615  * After some sanity checks creates a drm_buf structure for each buffer and
616  * reallocates the buffer list of the same size order to accommodate the new
617  * buffers.
618  */
619 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
620 {
621         struct drm_device_dma *dma = dev->dma;
622         struct drm_buf_entry *entry;
623         struct drm_agp_mem *agp_entry;
624         struct drm_buf *buf;
625         unsigned long offset;
626         unsigned long agp_offset;
627         int count;
628         int order;
629         int size;
630         int alignment;
631         int page_order;
632         int total;
633         int byte_count;
634         int i, valid;
635         struct drm_buf **temp_buflist;
636
637         if (!dma)
638                 return -EINVAL;
639
640         count = request->count;
641         order = drm_order(request->size);
642         size = 1 << order;
643
644         alignment = (request->flags & _DRM_PAGE_ALIGN)
645             ? PAGE_ALIGN(size) : size;
646         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
647         total = PAGE_SIZE << page_order;
648
649         byte_count = 0;
650         agp_offset = dev->agp->base + request->agp_start;
651
652         DRM_DEBUG("count:      %d\n", count);
653         DRM_DEBUG("order:      %d\n", order);
654         DRM_DEBUG("size:       %d\n", size);
655         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
656         DRM_DEBUG("alignment:  %d\n", alignment);
657         DRM_DEBUG("page_order: %d\n", page_order);
658         DRM_DEBUG("total:      %d\n", total);
659
660         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
661                 return -EINVAL;
662         if (dev->queue_count)
663                 return -EBUSY;  /* Not while in use */
664
665         /* Make sure buffers are located in AGP memory that we own */
666         valid = 0;
667         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
668                 if ((agp_offset >= agp_entry->bound) &&
669                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
670                         valid = 1;
671                         break;
672                 }
673         }
674         if (!list_empty(&dev->agp->memory) && !valid) {
675                 DRM_DEBUG("zone invalid\n");
676                 return -EINVAL;
677         }
678         spin_lock(&dev->count_lock);
679         if (dev->buf_use) {
680                 spin_unlock(&dev->count_lock);
681                 return -EBUSY;
682         }
683         atomic_inc(&dev->buf_alloc);
684         spin_unlock(&dev->count_lock);
685
686         mutex_lock(&dev->struct_mutex);
687         entry = &dma->bufs[order];
688         if (entry->buf_count) {
689                 mutex_unlock(&dev->struct_mutex);
690                 atomic_dec(&dev->buf_alloc);
691                 return -ENOMEM; /* May only call once for each order */
692         }
693
694         if (count < 0 || count > 4096) {
695                 mutex_unlock(&dev->struct_mutex);
696                 atomic_dec(&dev->buf_alloc);
697                 return -EINVAL;
698         }
699
700         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
701                                    DRM_MEM_BUFS);
702         if (!entry->buflist) {
703                 mutex_unlock(&dev->struct_mutex);
704                 atomic_dec(&dev->buf_alloc);
705                 return -ENOMEM;
706         }
707         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
708
709         entry->buf_size = size;
710         entry->page_order = page_order;
711
712         offset = 0;
713
714         while (entry->buf_count < count) {
715                 buf = &entry->buflist[entry->buf_count];
716                 buf->idx = dma->buf_count + entry->buf_count;
717                 buf->total = alignment;
718                 buf->order = order;
719                 buf->used = 0;
720
721                 buf->offset = (dma->byte_count + offset);
722                 buf->bus_address = agp_offset + offset;
723                 buf->address = (void *)(agp_offset + offset);
724                 buf->next = NULL;
725                 buf->waiting = 0;
726                 buf->pending = 0;
727                 init_waitqueue_head(&buf->dma_wait);
728                 buf->file_priv = NULL;
729
730                 buf->dev_priv_size = dev->driver->dev_priv_size;
731                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
732                 if (!buf->dev_private) {
733                         /* Set count correctly so we free the proper amount. */
734                         entry->buf_count = count;
735                         drm_cleanup_buf_error(dev, entry);
736                         mutex_unlock(&dev->struct_mutex);
737                         atomic_dec(&dev->buf_alloc);
738                         return -ENOMEM;
739                 }
740                 memset(buf->dev_private, 0, buf->dev_priv_size);
741
742                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
743
744                 offset += alignment;
745                 entry->buf_count++;
746                 byte_count += PAGE_SIZE << page_order;
747         }
748
749         DRM_DEBUG("byte_count: %d\n", byte_count);
750
751         temp_buflist = drm_realloc(dma->buflist,
752                                    dma->buf_count * sizeof(*dma->buflist),
753                                    (dma->buf_count + entry->buf_count)
754                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
755         if (!temp_buflist) {
756                 /* Free the entry because it isn't valid */
757                 drm_cleanup_buf_error(dev, entry);
758                 mutex_unlock(&dev->struct_mutex);
759                 atomic_dec(&dev->buf_alloc);
760                 return -ENOMEM;
761         }
762         dma->buflist = temp_buflist;
763
764         for (i = 0; i < entry->buf_count; i++) {
765                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
766         }
767
768         dma->buf_count += entry->buf_count;
769         dma->seg_count += entry->seg_count;
770         dma->page_count += byte_count >> PAGE_SHIFT;
771         dma->byte_count += byte_count;
772
773         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
774         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
775
776         mutex_unlock(&dev->struct_mutex);
777
778         request->count = entry->buf_count;
779         request->size = size;
780
781         dma->flags = _DRM_DMA_USE_AGP;
782
783         atomic_dec(&dev->buf_alloc);
784         return 0;
785 }
786 EXPORT_SYMBOL(drm_addbufs_agp);
787 #endif                          /* __OS_HAS_AGP */
788
789 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
790 {
791         struct drm_device_dma *dma = dev->dma;
792         int count;
793         int order;
794         int size;
795         int total;
796         int page_order;
797         struct drm_buf_entry *entry;
798         drm_dma_handle_t *dmah;
799         struct drm_buf *buf;
800         int alignment;
801         unsigned long offset;
802         int i;
803         int byte_count;
804         int page_count;
805         unsigned long *temp_pagelist;
806         struct drm_buf **temp_buflist;
807
808         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
809                 return -EINVAL;
810
811         if (!dma)
812                 return -EINVAL;
813
814         if (!capable(CAP_SYS_ADMIN))
815                 return -EPERM;
816
817         count = request->count;
818         order = drm_order(request->size);
819         size = 1 << order;
820
821         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
822                   request->count, request->size, size, order, dev->queue_count);
823
824         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
825                 return -EINVAL;
826         if (dev->queue_count)
827                 return -EBUSY;  /* Not while in use */
828
829         alignment = (request->flags & _DRM_PAGE_ALIGN)
830             ? PAGE_ALIGN(size) : size;
831         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
832         total = PAGE_SIZE << page_order;
833
834         spin_lock(&dev->count_lock);
835         if (dev->buf_use) {
836                 spin_unlock(&dev->count_lock);
837                 return -EBUSY;
838         }
839         atomic_inc(&dev->buf_alloc);
840         spin_unlock(&dev->count_lock);
841
842         mutex_lock(&dev->struct_mutex);
843         entry = &dma->bufs[order];
844         if (entry->buf_count) {
845                 mutex_unlock(&dev->struct_mutex);
846                 atomic_dec(&dev->buf_alloc);
847                 return -ENOMEM; /* May only call once for each order */
848         }
849
850         if (count < 0 || count > 4096) {
851                 mutex_unlock(&dev->struct_mutex);
852                 atomic_dec(&dev->buf_alloc);
853                 return -EINVAL;
854         }
855
856         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
857                                    DRM_MEM_BUFS);
858         if (!entry->buflist) {
859                 mutex_unlock(&dev->struct_mutex);
860                 atomic_dec(&dev->buf_alloc);
861                 return -ENOMEM;
862         }
863         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
864
865         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
866                                    DRM_MEM_SEGS);
867         if (!entry->seglist) {
868                 drm_free(entry->buflist,
869                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
870                 mutex_unlock(&dev->struct_mutex);
871                 atomic_dec(&dev->buf_alloc);
872                 return -ENOMEM;
873         }
874         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
875
876         /* Keep the original pagelist until we know all the allocations
877          * have succeeded
878          */
879         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
880                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
881         if (!temp_pagelist) {
882                 drm_free(entry->buflist,
883                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
884                 drm_free(entry->seglist,
885                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
886                 mutex_unlock(&dev->struct_mutex);
887                 atomic_dec(&dev->buf_alloc);
888                 return -ENOMEM;
889         }
890         memcpy(temp_pagelist,
891                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
892         DRM_DEBUG("pagelist: %d entries\n",
893                   dma->page_count + (count << page_order));
894
895         entry->buf_size = size;
896         entry->page_order = page_order;
897         byte_count = 0;
898         page_count = 0;
899
900         while (entry->buf_count < count) {
901
902                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
903
904                 if (!dmah) {
905                         /* Set count correctly so we free the proper amount. */
906                         entry->buf_count = count;
907                         entry->seg_count = count;
908                         drm_cleanup_buf_error(dev, entry);
909                         drm_free(temp_pagelist,
910                                  (dma->page_count + (count << page_order))
911                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
912                         mutex_unlock(&dev->struct_mutex);
913                         atomic_dec(&dev->buf_alloc);
914                         return -ENOMEM;
915                 }
916                 entry->seglist[entry->seg_count++] = dmah;
917                 for (i = 0; i < (1 << page_order); i++) {
918                         DRM_DEBUG("page %d @ 0x%08lx\n",
919                                   dma->page_count + page_count,
920                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
921                         temp_pagelist[dma->page_count + page_count++]
922                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
923                 }
924                 for (offset = 0;
925                      offset + size <= total && entry->buf_count < count;
926                      offset += alignment, ++entry->buf_count) {
927                         buf = &entry->buflist[entry->buf_count];
928                         buf->idx = dma->buf_count + entry->buf_count;
929                         buf->total = alignment;
930                         buf->order = order;
931                         buf->used = 0;
932                         buf->offset = (dma->byte_count + byte_count + offset);
933                         buf->address = (void *)(dmah->vaddr + offset);
934                         buf->bus_address = dmah->busaddr + offset;
935                         buf->next = NULL;
936                         buf->waiting = 0;
937                         buf->pending = 0;
938                         init_waitqueue_head(&buf->dma_wait);
939                         buf->file_priv = NULL;
940
941                         buf->dev_priv_size = dev->driver->dev_priv_size;
942                         buf->dev_private = drm_alloc(buf->dev_priv_size,
943                                                      DRM_MEM_BUFS);
944                         if (!buf->dev_private) {
945                                 /* Set count correctly so we free the proper amount. */
946                                 entry->buf_count = count;
947                                 entry->seg_count = count;
948                                 drm_cleanup_buf_error(dev, entry);
949                                 drm_free(temp_pagelist,
950                                          (dma->page_count +
951                                           (count << page_order))
952                                          * sizeof(*dma->pagelist),
953                                          DRM_MEM_PAGES);
954                                 mutex_unlock(&dev->struct_mutex);
955                                 atomic_dec(&dev->buf_alloc);
956                                 return -ENOMEM;
957                         }
958                         memset(buf->dev_private, 0, buf->dev_priv_size);
959
960                         DRM_DEBUG("buffer %d @ %p\n",
961                                   entry->buf_count, buf->address);
962                 }
963                 byte_count += PAGE_SIZE << page_order;
964         }
965
966         temp_buflist = drm_realloc(dma->buflist,
967                                    dma->buf_count * sizeof(*dma->buflist),
968                                    (dma->buf_count + entry->buf_count)
969                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
970         if (!temp_buflist) {
971                 /* Free the entry because it isn't valid */
972                 drm_cleanup_buf_error(dev, entry);
973                 drm_free(temp_pagelist,
974                          (dma->page_count + (count << page_order))
975                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
976                 mutex_unlock(&dev->struct_mutex);
977                 atomic_dec(&dev->buf_alloc);
978                 return -ENOMEM;
979         }
980         dma->buflist = temp_buflist;
981
982         for (i = 0; i < entry->buf_count; i++) {
983                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
984         }
985
986         /* No allocations failed, so now we can replace the orginal pagelist
987          * with the new one.
988          */
989         if (dma->page_count) {
990                 drm_free(dma->pagelist,
991                          dma->page_count * sizeof(*dma->pagelist),
992                          DRM_MEM_PAGES);
993         }
994         dma->pagelist = temp_pagelist;
995
996         dma->buf_count += entry->buf_count;
997         dma->seg_count += entry->seg_count;
998         dma->page_count += entry->seg_count << page_order;
999         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1000
1001         mutex_unlock(&dev->struct_mutex);
1002
1003         request->count = entry->buf_count;
1004         request->size = size;
1005
1006         if (request->flags & _DRM_PCI_BUFFER_RO)
1007                 dma->flags = _DRM_DMA_USE_PCI_RO;
1008
1009         atomic_dec(&dev->buf_alloc);
1010         return 0;
1011
1012 }
1013 EXPORT_SYMBOL(drm_addbufs_pci);
1014
1015 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
1016 {
1017         struct drm_device_dma *dma = dev->dma;
1018         struct drm_buf_entry *entry;
1019         struct drm_buf *buf;
1020         unsigned long offset;
1021         unsigned long agp_offset;
1022         int count;
1023         int order;
1024         int size;
1025         int alignment;
1026         int page_order;
1027         int total;
1028         int byte_count;
1029         int i;
1030         struct drm_buf **temp_buflist;
1031
1032         if (!drm_core_check_feature(dev, DRIVER_SG))
1033                 return -EINVAL;
1034
1035         if (!dma)
1036                 return -EINVAL;
1037
1038         if (!capable(CAP_SYS_ADMIN))
1039                 return -EPERM;
1040
1041         count = request->count;
1042         order = drm_order(request->size);
1043         size = 1 << order;
1044
1045         alignment = (request->flags & _DRM_PAGE_ALIGN)
1046             ? PAGE_ALIGN(size) : size;
1047         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1048         total = PAGE_SIZE << page_order;
1049
1050         byte_count = 0;
1051         agp_offset = request->agp_start;
1052
1053         DRM_DEBUG("count:      %d\n", count);
1054         DRM_DEBUG("order:      %d\n", order);
1055         DRM_DEBUG("size:       %d\n", size);
1056         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1057         DRM_DEBUG("alignment:  %d\n", alignment);
1058         DRM_DEBUG("page_order: %d\n", page_order);
1059         DRM_DEBUG("total:      %d\n", total);
1060
1061         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1062                 return -EINVAL;
1063         if (dev->queue_count)
1064                 return -EBUSY;  /* Not while in use */
1065
1066         spin_lock(&dev->count_lock);
1067         if (dev->buf_use) {
1068                 spin_unlock(&dev->count_lock);
1069                 return -EBUSY;
1070         }
1071         atomic_inc(&dev->buf_alloc);
1072         spin_unlock(&dev->count_lock);
1073
1074         mutex_lock(&dev->struct_mutex);
1075         entry = &dma->bufs[order];
1076         if (entry->buf_count) {
1077                 mutex_unlock(&dev->struct_mutex);
1078                 atomic_dec(&dev->buf_alloc);
1079                 return -ENOMEM; /* May only call once for each order */
1080         }
1081
1082         if (count < 0 || count > 4096) {
1083                 mutex_unlock(&dev->struct_mutex);
1084                 atomic_dec(&dev->buf_alloc);
1085                 return -EINVAL;
1086         }
1087
1088         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1089                                    DRM_MEM_BUFS);
1090         if (!entry->buflist) {
1091                 mutex_unlock(&dev->struct_mutex);
1092                 atomic_dec(&dev->buf_alloc);
1093                 return -ENOMEM;
1094         }
1095         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1096
1097         entry->buf_size = size;
1098         entry->page_order = page_order;
1099
1100         offset = 0;
1101
1102         while (entry->buf_count < count) {
1103                 buf = &entry->buflist[entry->buf_count];
1104                 buf->idx = dma->buf_count + entry->buf_count;
1105                 buf->total = alignment;
1106                 buf->order = order;
1107                 buf->used = 0;
1108
1109                 buf->offset = (dma->byte_count + offset);
1110                 buf->bus_address = agp_offset + offset;
1111                 buf->address = (void *)(agp_offset + offset
1112                                         + (unsigned long)dev->sg->virtual);
1113                 buf->next = NULL;
1114                 buf->waiting = 0;
1115                 buf->pending = 0;
1116                 init_waitqueue_head(&buf->dma_wait);
1117                 buf->file_priv = NULL;
1118
1119                 buf->dev_priv_size = dev->driver->dev_priv_size;
1120                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1121                 if (!buf->dev_private) {
1122                         /* Set count correctly so we free the proper amount. */
1123                         entry->buf_count = count;
1124                         drm_cleanup_buf_error(dev, entry);
1125                         mutex_unlock(&dev->struct_mutex);
1126                         atomic_dec(&dev->buf_alloc);
1127                         return -ENOMEM;
1128                 }
1129
1130                 memset(buf->dev_private, 0, buf->dev_priv_size);
1131
1132                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1133
1134                 offset += alignment;
1135                 entry->buf_count++;
1136                 byte_count += PAGE_SIZE << page_order;
1137         }
1138
1139         DRM_DEBUG("byte_count: %d\n", byte_count);
1140
1141         temp_buflist = drm_realloc(dma->buflist,
1142                                    dma->buf_count * sizeof(*dma->buflist),
1143                                    (dma->buf_count + entry->buf_count)
1144                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1145         if (!temp_buflist) {
1146                 /* Free the entry because it isn't valid */
1147                 drm_cleanup_buf_error(dev, entry);
1148                 mutex_unlock(&dev->struct_mutex);
1149                 atomic_dec(&dev->buf_alloc);
1150                 return -ENOMEM;
1151         }
1152         dma->buflist = temp_buflist;
1153
1154         for (i = 0; i < entry->buf_count; i++) {
1155                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1156         }
1157
1158         dma->buf_count += entry->buf_count;
1159         dma->seg_count += entry->seg_count;
1160         dma->page_count += byte_count >> PAGE_SHIFT;
1161         dma->byte_count += byte_count;
1162
1163         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1164         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1165
1166         mutex_unlock(&dev->struct_mutex);
1167
1168         request->count = entry->buf_count;
1169         request->size = size;
1170
1171         dma->flags = _DRM_DMA_USE_SG;
1172
1173         atomic_dec(&dev->buf_alloc);
1174         return 0;
1175 }
1176
1177 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1178 {
1179         struct drm_device_dma *dma = dev->dma;
1180         struct drm_buf_entry *entry;
1181         struct drm_buf *buf;
1182         unsigned long offset;
1183         unsigned long agp_offset;
1184         int count;
1185         int order;
1186         int size;
1187         int alignment;
1188         int page_order;
1189         int total;
1190         int byte_count;
1191         int i;
1192         struct drm_buf **temp_buflist;
1193
1194         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1195                 return -EINVAL;
1196
1197         if (!dma)
1198                 return -EINVAL;
1199
1200         if (!capable(CAP_SYS_ADMIN))
1201                 return -EPERM;
1202
1203         count = request->count;
1204         order = drm_order(request->size);
1205         size = 1 << order;
1206
1207         alignment = (request->flags & _DRM_PAGE_ALIGN)
1208             ? PAGE_ALIGN(size) : size;
1209         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1210         total = PAGE_SIZE << page_order;
1211
1212         byte_count = 0;
1213         agp_offset = request->agp_start;
1214
1215         DRM_DEBUG("count:      %d\n", count);
1216         DRM_DEBUG("order:      %d\n", order);
1217         DRM_DEBUG("size:       %d\n", size);
1218         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1219         DRM_DEBUG("alignment:  %d\n", alignment);
1220         DRM_DEBUG("page_order: %d\n", page_order);
1221         DRM_DEBUG("total:      %d\n", total);
1222
1223         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1224                 return -EINVAL;
1225         if (dev->queue_count)
1226                 return -EBUSY;  /* Not while in use */
1227
1228         spin_lock(&dev->count_lock);
1229         if (dev->buf_use) {
1230                 spin_unlock(&dev->count_lock);
1231                 return -EBUSY;
1232         }
1233         atomic_inc(&dev->buf_alloc);
1234         spin_unlock(&dev->count_lock);
1235
1236         mutex_lock(&dev->struct_mutex);
1237         entry = &dma->bufs[order];
1238         if (entry->buf_count) {
1239                 mutex_unlock(&dev->struct_mutex);
1240                 atomic_dec(&dev->buf_alloc);
1241                 return -ENOMEM; /* May only call once for each order */
1242         }
1243
1244         if (count < 0 || count > 4096) {
1245                 mutex_unlock(&dev->struct_mutex);
1246                 atomic_dec(&dev->buf_alloc);
1247                 return -EINVAL;
1248         }
1249
1250         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1251                                    DRM_MEM_BUFS);
1252         if (!entry->buflist) {
1253                 mutex_unlock(&dev->struct_mutex);
1254                 atomic_dec(&dev->buf_alloc);
1255                 return -ENOMEM;
1256         }
1257         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1258
1259         entry->buf_size = size;
1260         entry->page_order = page_order;
1261
1262         offset = 0;
1263
1264         while (entry->buf_count < count) {
1265                 buf = &entry->buflist[entry->buf_count];
1266                 buf->idx = dma->buf_count + entry->buf_count;
1267                 buf->total = alignment;
1268                 buf->order = order;
1269                 buf->used = 0;
1270
1271                 buf->offset = (dma->byte_count + offset);
1272                 buf->bus_address = agp_offset + offset;
1273                 buf->address = (void *)(agp_offset + offset);
1274                 buf->next = NULL;
1275                 buf->waiting = 0;
1276                 buf->pending = 0;
1277                 init_waitqueue_head(&buf->dma_wait);
1278                 buf->file_priv = NULL;
1279
1280                 buf->dev_priv_size = dev->driver->dev_priv_size;
1281                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1282                 if (!buf->dev_private) {
1283                         /* Set count correctly so we free the proper amount. */
1284                         entry->buf_count = count;
1285                         drm_cleanup_buf_error(dev, entry);
1286                         mutex_unlock(&dev->struct_mutex);
1287                         atomic_dec(&dev->buf_alloc);
1288                         return -ENOMEM;
1289                 }
1290                 memset(buf->dev_private, 0, buf->dev_priv_size);
1291
1292                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1293
1294                 offset += alignment;
1295                 entry->buf_count++;
1296                 byte_count += PAGE_SIZE << page_order;
1297         }
1298
1299         DRM_DEBUG("byte_count: %d\n", byte_count);
1300
1301         temp_buflist = drm_realloc(dma->buflist,
1302                                    dma->buf_count * sizeof(*dma->buflist),
1303                                    (dma->buf_count + entry->buf_count)
1304                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1305         if (!temp_buflist) {
1306                 /* Free the entry because it isn't valid */
1307                 drm_cleanup_buf_error(dev, entry);
1308                 mutex_unlock(&dev->struct_mutex);
1309                 atomic_dec(&dev->buf_alloc);
1310                 return -ENOMEM;
1311         }
1312         dma->buflist = temp_buflist;
1313
1314         for (i = 0; i < entry->buf_count; i++) {
1315                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1316         }
1317
1318         dma->buf_count += entry->buf_count;
1319         dma->seg_count += entry->seg_count;
1320         dma->page_count += byte_count >> PAGE_SHIFT;
1321         dma->byte_count += byte_count;
1322
1323         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1324         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1325
1326         mutex_unlock(&dev->struct_mutex);
1327
1328         request->count = entry->buf_count;
1329         request->size = size;
1330
1331         dma->flags = _DRM_DMA_USE_FB;
1332
1333         atomic_dec(&dev->buf_alloc);
1334         return 0;
1335 }
1336
1337
1338 /**
1339  * Add buffers for DMA transfers (ioctl).
1340  *
1341  * \param inode device inode.
1342  * \param file_priv DRM file private.
1343  * \param cmd command.
1344  * \param arg pointer to a struct drm_buf_desc request.
1345  * \return zero on success or a negative number on failure.
1346  *
1347  * According with the memory type specified in drm_buf_desc::flags and the
1348  * build options, it dispatches the call either to addbufs_agp(),
1349  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1350  * PCI memory respectively.
1351  */
1352 int drm_addbufs(struct drm_device *dev, void *data,
1353                 struct drm_file *file_priv)
1354 {
1355         struct drm_buf_desc *request = data;
1356         int ret;
1357
1358         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1359                 return -EINVAL;
1360
1361 #if __OS_HAS_AGP
1362         if (request->flags & _DRM_AGP_BUFFER)
1363                 ret = drm_addbufs_agp(dev, request);
1364         else
1365 #endif
1366         if (request->flags & _DRM_SG_BUFFER)
1367                 ret = drm_addbufs_sg(dev, request);
1368         else if (request->flags & _DRM_FB_BUFFER)
1369                 ret = drm_addbufs_fb(dev, request);
1370         else
1371                 ret = drm_addbufs_pci(dev, request);
1372
1373         return ret;
1374 }
1375
1376 /**
1377  * Get information about the buffer mappings.
1378  *
1379  * This was originally mean for debugging purposes, or by a sophisticated
1380  * client library to determine how best to use the available buffers (e.g.,
1381  * large buffers can be used for image transfer).
1382  *
1383  * \param inode device inode.
1384  * \param file_priv DRM file private.
1385  * \param cmd command.
1386  * \param arg pointer to a drm_buf_info structure.
1387  * \return zero on success or a negative number on failure.
1388  *
1389  * Increments drm_device::buf_use while holding the drm_device::count_lock
1390  * lock, preventing of allocating more buffers after this call. Information
1391  * about each requested buffer is then copied into user space.
1392  */
1393 int drm_infobufs(struct drm_device *dev, void *data,
1394                  struct drm_file *file_priv)
1395 {
1396         struct drm_device_dma *dma = dev->dma;
1397         struct drm_buf_info *request = data;
1398         int i;
1399         int count;
1400
1401         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1402                 return -EINVAL;
1403
1404         if (!dma)
1405                 return -EINVAL;
1406
1407         spin_lock(&dev->count_lock);
1408         if (atomic_read(&dev->buf_alloc)) {
1409                 spin_unlock(&dev->count_lock);
1410                 return -EBUSY;
1411         }
1412         ++dev->buf_use;         /* Can't allocate more after this call */
1413         spin_unlock(&dev->count_lock);
1414
1415         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1416                 if (dma->bufs[i].buf_count)
1417                         ++count;
1418         }
1419
1420         DRM_DEBUG("count = %d\n", count);
1421
1422         if (request->count >= count) {
1423                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1424                         if (dma->bufs[i].buf_count) {
1425                                 struct drm_buf_desc __user *to =
1426                                     &request->list[count];
1427                                 struct drm_buf_entry *from = &dma->bufs[i];
1428                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1429                                 if (copy_to_user(&to->count,
1430                                                  &from->buf_count,
1431                                                  sizeof(from->buf_count)) ||
1432                                     copy_to_user(&to->size,
1433                                                  &from->buf_size,
1434                                                  sizeof(from->buf_size)) ||
1435                                     copy_to_user(&to->low_mark,
1436                                                  &list->low_mark,
1437                                                  sizeof(list->low_mark)) ||
1438                                     copy_to_user(&to->high_mark,
1439                                                  &list->high_mark,
1440                                                  sizeof(list->high_mark)))
1441                                         return -EFAULT;
1442
1443                                 DRM_DEBUG("%d %d %d %d %d\n",
1444                                           i,
1445                                           dma->bufs[i].buf_count,
1446                                           dma->bufs[i].buf_size,
1447                                           dma->bufs[i].freelist.low_mark,
1448                                           dma->bufs[i].freelist.high_mark);
1449                                 ++count;
1450                         }
1451                 }
1452         }
1453         request->count = count;
1454
1455         return 0;
1456 }
1457
1458 /**
1459  * Specifies a low and high water mark for buffer allocation
1460  *
1461  * \param inode device inode.
1462  * \param file_priv DRM file private.
1463  * \param cmd command.
1464  * \param arg a pointer to a drm_buf_desc structure.
1465  * \return zero on success or a negative number on failure.
1466  *
1467  * Verifies that the size order is bounded between the admissible orders and
1468  * updates the respective drm_device_dma::bufs entry low and high water mark.
1469  *
1470  * \note This ioctl is deprecated and mostly never used.
1471  */
1472 int drm_markbufs(struct drm_device *dev, void *data,
1473                  struct drm_file *file_priv)
1474 {
1475         struct drm_device_dma *dma = dev->dma;
1476         struct drm_buf_desc *request = data;
1477         int order;
1478         struct drm_buf_entry *entry;
1479
1480         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1481                 return -EINVAL;
1482
1483         if (!dma)
1484                 return -EINVAL;
1485
1486         DRM_DEBUG("%d, %d, %d\n",
1487                   request->size, request->low_mark, request->high_mark);
1488         order = drm_order(request->size);
1489         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1490                 return -EINVAL;
1491         entry = &dma->bufs[order];
1492
1493         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1494                 return -EINVAL;
1495         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1496                 return -EINVAL;
1497
1498         entry->freelist.low_mark = request->low_mark;
1499         entry->freelist.high_mark = request->high_mark;
1500
1501         return 0;
1502 }
1503
1504 /**
1505  * Unreserve the buffers in list, previously reserved using drmDMA.
1506  *
1507  * \param inode device inode.
1508  * \param file_priv DRM file private.
1509  * \param cmd command.
1510  * \param arg pointer to a drm_buf_free structure.
1511  * \return zero on success or a negative number on failure.
1512  *
1513  * Calls free_buffer() for each used buffer.
1514  * This function is primarily used for debugging.
1515  */
1516 int drm_freebufs(struct drm_device *dev, void *data,
1517                  struct drm_file *file_priv)
1518 {
1519         struct drm_device_dma *dma = dev->dma;
1520         struct drm_buf_free *request = data;
1521         int i;
1522         int idx;
1523         struct drm_buf *buf;
1524
1525         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1526                 return -EINVAL;
1527
1528         if (!dma)
1529                 return -EINVAL;
1530
1531         DRM_DEBUG("%d\n", request->count);
1532         for (i = 0; i < request->count; i++) {
1533                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1534                         return -EFAULT;
1535                 if (idx < 0 || idx >= dma->buf_count) {
1536                         DRM_ERROR("Index %d (of %d max)\n",
1537                                   idx, dma->buf_count - 1);
1538                         return -EINVAL;
1539                 }
1540                 buf = dma->buflist[idx];
1541                 if (buf->file_priv != file_priv) {
1542                         DRM_ERROR("Process %d freeing buffer not owned\n",
1543                                   task_pid_nr(current));
1544                         return -EINVAL;
1545                 }
1546                 drm_free_buffer(dev, buf);
1547         }
1548
1549         return 0;
1550 }
1551
1552 /**
1553  * Maps all of the DMA buffers into client-virtual space (ioctl).
1554  *
1555  * \param inode device inode.
1556  * \param file_priv DRM file private.
1557  * \param cmd command.
1558  * \param arg pointer to a drm_buf_map structure.
1559  * \return zero on success or a negative number on failure.
1560  *
1561  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1562  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1563  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1564  * drm_mmap_dma().
1565  */
1566 int drm_mapbufs(struct drm_device *dev, void *data,
1567                 struct drm_file *file_priv)
1568 {
1569         struct drm_device_dma *dma = dev->dma;
1570         int retcode = 0;
1571         const int zero = 0;
1572         unsigned long virtual;
1573         unsigned long address;
1574         struct drm_buf_map *request = data;
1575         int i;
1576
1577         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1578                 return -EINVAL;
1579
1580         if (!dma)
1581                 return -EINVAL;
1582
1583         spin_lock(&dev->count_lock);
1584         if (atomic_read(&dev->buf_alloc)) {
1585                 spin_unlock(&dev->count_lock);
1586                 return -EBUSY;
1587         }
1588         dev->buf_use++;         /* Can't allocate more after this call */
1589         spin_unlock(&dev->count_lock);
1590
1591         if (request->count >= dma->buf_count) {
1592                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1593                     || (drm_core_check_feature(dev, DRIVER_SG)
1594                         && (dma->flags & _DRM_DMA_USE_SG))
1595                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1596                         && (dma->flags & _DRM_DMA_USE_FB))) {
1597                         struct drm_local_map *map = dev->agp_buffer_map;
1598                         unsigned long token = dev->agp_buffer_token;
1599
1600                         if (!map) {
1601                                 retcode = -EINVAL;
1602                                 goto done;
1603                         }
1604                         down_write(&current->mm->mmap_sem);
1605                         virtual = do_mmap(file_priv->filp, 0, map->size,
1606                                           PROT_READ | PROT_WRITE,
1607                                           MAP_SHARED,
1608                                           token);
1609                         up_write(&current->mm->mmap_sem);
1610                 } else {
1611                         down_write(&current->mm->mmap_sem);
1612                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1613                                           PROT_READ | PROT_WRITE,
1614                                           MAP_SHARED, 0);
1615                         up_write(&current->mm->mmap_sem);
1616                 }
1617                 if (virtual > -1024UL) {
1618                         /* Real error */
1619                         retcode = (signed long)virtual;
1620                         goto done;
1621                 }
1622                 request->virtual = (void __user *)virtual;
1623
1624                 for (i = 0; i < dma->buf_count; i++) {
1625                         if (copy_to_user(&request->list[i].idx,
1626                                          &dma->buflist[i]->idx,
1627                                          sizeof(request->list[0].idx))) {
1628                                 retcode = -EFAULT;
1629                                 goto done;
1630                         }
1631                         if (copy_to_user(&request->list[i].total,
1632                                          &dma->buflist[i]->total,
1633                                          sizeof(request->list[0].total))) {
1634                                 retcode = -EFAULT;
1635                                 goto done;
1636                         }
1637                         if (copy_to_user(&request->list[i].used,
1638                                          &zero, sizeof(zero))) {
1639                                 retcode = -EFAULT;
1640                                 goto done;
1641                         }
1642                         address = virtual + dma->buflist[i]->offset;    /* *** */
1643                         if (copy_to_user(&request->list[i].address,
1644                                          &address, sizeof(address))) {
1645                                 retcode = -EFAULT;
1646                                 goto done;
1647                         }
1648                 }
1649         }
1650       done:
1651         request->count = dma->buf_count;
1652         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1653
1654         return retcode;
1655 }
1656
1657 /**
1658  * Compute size order.  Returns the exponent of the smaller power of two which
1659  * is greater or equal to given number.
1660  *
1661  * \param size size.
1662  * \return order.
1663  *
1664  * \todo Can be made faster.
1665  */
1666 int drm_order(unsigned long size)
1667 {
1668         int order;
1669         unsigned long tmp;
1670
1671         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1672
1673         if (size & (size - 1))
1674                 ++order;
1675
1676         return order;
1677 }
1678 EXPORT_SYMBOL(drm_order);