drm/radeon: don't allow audio on DCE6
[linux-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/slab.h>
38 #include <linux/log2.h>
39 #include <linux/export.h>
40 #include <asm/shmparam.h>
41 #include "drmP.h"
42
43 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
44                                                   struct drm_local_map *map)
45 {
46         struct drm_map_list *entry;
47         list_for_each_entry(entry, &dev->maplist, head) {
48                 /*
49                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
50                  * while PCI resources may live above that, we only compare the
51                  * lower 32 bits of the map offset for maps of type
52                  * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
53                  * It is assumed that if a driver have more than one resource
54                  * of each type, the lower 32 bits are different.
55                  */
56                 if (!entry->map ||
57                     map->type != entry->map->type ||
58                     entry->master != dev->primary->master)
59                         continue;
60                 switch (map->type) {
61                 case _DRM_SHM:
62                         if (map->flags != _DRM_CONTAINS_LOCK)
63                                 break;
64                         return entry;
65                 case _DRM_REGISTERS:
66                 case _DRM_FRAME_BUFFER:
67                         if ((entry->map->offset & 0xffffffff) ==
68                             (map->offset & 0xffffffff))
69                                 return entry;
70                 default: /* Make gcc happy */
71                         ;
72                 }
73                 if (entry->map->offset == map->offset)
74                         return entry;
75         }
76
77         return NULL;
78 }
79
80 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
81                           unsigned long user_token, int hashed_handle, int shm)
82 {
83         int use_hashed_handle, shift;
84         unsigned long add;
85
86 #if (BITS_PER_LONG == 64)
87         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
88 #elif (BITS_PER_LONG == 32)
89         use_hashed_handle = hashed_handle;
90 #else
91 #error Unsupported long size. Neither 64 nor 32 bits.
92 #endif
93
94         if (!use_hashed_handle) {
95                 int ret;
96                 hash->key = user_token >> PAGE_SHIFT;
97                 ret = drm_ht_insert_item(&dev->map_hash, hash);
98                 if (ret != -EINVAL)
99                         return ret;
100         }
101
102         shift = 0;
103         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
104         if (shm && (SHMLBA > PAGE_SIZE)) {
105                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
106
107                 /* For shared memory, we have to preserve the SHMLBA
108                  * bits of the eventual vma->vm_pgoff value during
109                  * mmap().  Otherwise we run into cache aliasing problems
110                  * on some platforms.  On these platforms, the pgoff of
111                  * a mmap() request is used to pick a suitable virtual
112                  * address for the mmap() region such that it will not
113                  * cause cache aliasing problems.
114                  *
115                  * Therefore, make sure the SHMLBA relevant bits of the
116                  * hash value we use are equal to those in the original
117                  * kernel virtual address.
118                  */
119                 shift = bits;
120                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
121         }
122
123         return drm_ht_just_insert_please(&dev->map_hash, hash,
124                                          user_token, 32 - PAGE_SHIFT - 3,
125                                          shift, add);
126 }
127
128 /**
129  * Core function to create a range of memory available for mapping by a
130  * non-root process.
131  *
132  * Adjusts the memory offset to its absolute value according to the mapping
133  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
134  * applicable and if supported by the kernel.
135  */
136 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
137                            unsigned int size, enum drm_map_type type,
138                            enum drm_map_flags flags,
139                            struct drm_map_list ** maplist)
140 {
141         struct drm_local_map *map;
142         struct drm_map_list *list;
143         drm_dma_handle_t *dmah;
144         unsigned long user_token;
145         int ret;
146
147         map = kmalloc(sizeof(*map), GFP_KERNEL);
148         if (!map)
149                 return -ENOMEM;
150
151         map->offset = offset;
152         map->size = size;
153         map->flags = flags;
154         map->type = type;
155
156         /* Only allow shared memory to be removable since we only keep enough
157          * book keeping information about shared memory to allow for removal
158          * when processes fork.
159          */
160         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
161                 kfree(map);
162                 return -EINVAL;
163         }
164         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
165                   (unsigned long long)map->offset, map->size, map->type);
166
167         /* page-align _DRM_SHM maps. They are allocated here so there is no security
168          * hole created by that and it works around various broken drivers that use
169          * a non-aligned quantity to map the SAREA. --BenH
170          */
171         if (map->type == _DRM_SHM)
172                 map->size = PAGE_ALIGN(map->size);
173
174         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
175                 kfree(map);
176                 return -EINVAL;
177         }
178         map->mtrr = -1;
179         map->handle = NULL;
180
181         switch (map->type) {
182         case _DRM_REGISTERS:
183         case _DRM_FRAME_BUFFER:
184 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
185                 if (map->offset + (map->size-1) < map->offset ||
186                     map->offset < virt_to_phys(high_memory)) {
187                         kfree(map);
188                         return -EINVAL;
189                 }
190 #endif
191                 /* Some drivers preinitialize some maps, without the X Server
192                  * needing to be aware of it.  Therefore, we just return success
193                  * when the server tries to create a duplicate map.
194                  */
195                 list = drm_find_matching_map(dev, map);
196                 if (list != NULL) {
197                         if (list->map->size != map->size) {
198                                 DRM_DEBUG("Matching maps of type %d with "
199                                           "mismatched sizes, (%ld vs %ld)\n",
200                                           map->type, map->size,
201                                           list->map->size);
202                                 list->map->size = map->size;
203                         }
204
205                         kfree(map);
206                         *maplist = list;
207                         return 0;
208                 }
209
210                 if (drm_core_has_MTRR(dev)) {
211                         if (map->type == _DRM_FRAME_BUFFER ||
212                             (map->flags & _DRM_WRITE_COMBINING)) {
213                                 map->mtrr = mtrr_add(map->offset, map->size,
214                                                      MTRR_TYPE_WRCOMB, 1);
215                         }
216                 }
217                 if (map->type == _DRM_REGISTERS) {
218                         map->handle = ioremap(map->offset, map->size);
219                         if (!map->handle) {
220                                 kfree(map);
221                                 return -ENOMEM;
222                         }
223                 }
224
225                 break;
226         case _DRM_SHM:
227                 list = drm_find_matching_map(dev, map);
228                 if (list != NULL) {
229                         if(list->map->size != map->size) {
230                                 DRM_DEBUG("Matching maps of type %d with "
231                                           "mismatched sizes, (%ld vs %ld)\n",
232                                           map->type, map->size, list->map->size);
233                                 list->map->size = map->size;
234                         }
235
236                         kfree(map);
237                         *maplist = list;
238                         return 0;
239                 }
240                 map->handle = vmalloc_user(map->size);
241                 DRM_DEBUG("%lu %d %p\n",
242                           map->size, drm_order(map->size), map->handle);
243                 if (!map->handle) {
244                         kfree(map);
245                         return -ENOMEM;
246                 }
247                 map->offset = (unsigned long)map->handle;
248                 if (map->flags & _DRM_CONTAINS_LOCK) {
249                         /* Prevent a 2nd X Server from creating a 2nd lock */
250                         if (dev->primary->master->lock.hw_lock != NULL) {
251                                 vfree(map->handle);
252                                 kfree(map);
253                                 return -EBUSY;
254                         }
255                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
256                 }
257                 break;
258         case _DRM_AGP: {
259                 struct drm_agp_mem *entry;
260                 int valid = 0;
261
262                 if (!drm_core_has_AGP(dev)) {
263                         kfree(map);
264                         return -EINVAL;
265                 }
266 #ifdef __alpha__
267                 map->offset += dev->hose->mem_space->start;
268 #endif
269                 /* In some cases (i810 driver), user space may have already
270                  * added the AGP base itself, because dev->agp->base previously
271                  * only got set during AGP enable.  So, only add the base
272                  * address if the map's offset isn't already within the
273                  * aperture.
274                  */
275                 if (map->offset < dev->agp->base ||
276                     map->offset > dev->agp->base +
277                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
278                         map->offset += dev->agp->base;
279                 }
280                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
281
282                 /* This assumes the DRM is in total control of AGP space.
283                  * It's not always the case as AGP can be in the control
284                  * of user space (i.e. i810 driver). So this loop will get
285                  * skipped and we double check that dev->agp->memory is
286                  * actually set as well as being invalid before EPERM'ing
287                  */
288                 list_for_each_entry(entry, &dev->agp->memory, head) {
289                         if ((map->offset >= entry->bound) &&
290                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
291                                 valid = 1;
292                                 break;
293                         }
294                 }
295                 if (!list_empty(&dev->agp->memory) && !valid) {
296                         kfree(map);
297                         return -EPERM;
298                 }
299                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
300                           (unsigned long long)map->offset, map->size);
301
302                 break;
303         }
304         case _DRM_GEM:
305                 DRM_ERROR("tried to addmap GEM object\n");
306                 break;
307         case _DRM_SCATTER_GATHER:
308                 if (!dev->sg) {
309                         kfree(map);
310                         return -EINVAL;
311                 }
312                 map->offset += (unsigned long)dev->sg->virtual;
313                 break;
314         case _DRM_CONSISTENT:
315                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
316                  * As we're limiting the address to 2^32-1 (or less),
317                  * casting it down to 32 bits is no problem, but we
318                  * need to point to a 64bit variable first. */
319                 dmah = drm_pci_alloc(dev, map->size, map->size);
320                 if (!dmah) {
321                         kfree(map);
322                         return -ENOMEM;
323                 }
324                 map->handle = dmah->vaddr;
325                 map->offset = (unsigned long)dmah->busaddr;
326                 kfree(dmah);
327                 break;
328         default:
329                 kfree(map);
330                 return -EINVAL;
331         }
332
333         list = kzalloc(sizeof(*list), GFP_KERNEL);
334         if (!list) {
335                 if (map->type == _DRM_REGISTERS)
336                         iounmap(map->handle);
337                 kfree(map);
338                 return -EINVAL;
339         }
340         list->map = map;
341
342         mutex_lock(&dev->struct_mutex);
343         list_add(&list->head, &dev->maplist);
344
345         /* Assign a 32-bit handle */
346         /* We do it here so that dev->struct_mutex protects the increment */
347         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
348                 map->offset;
349         ret = drm_map_handle(dev, &list->hash, user_token, 0,
350                              (map->type == _DRM_SHM));
351         if (ret) {
352                 if (map->type == _DRM_REGISTERS)
353                         iounmap(map->handle);
354                 kfree(map);
355                 kfree(list);
356                 mutex_unlock(&dev->struct_mutex);
357                 return ret;
358         }
359
360         list->user_token = list->hash.key << PAGE_SHIFT;
361         mutex_unlock(&dev->struct_mutex);
362
363         if (!(map->flags & _DRM_DRIVER))
364                 list->master = dev->primary->master;
365         *maplist = list;
366         return 0;
367         }
368
369 int drm_addmap(struct drm_device * dev, resource_size_t offset,
370                unsigned int size, enum drm_map_type type,
371                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
372 {
373         struct drm_map_list *list;
374         int rc;
375
376         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
377         if (!rc)
378                 *map_ptr = list->map;
379         return rc;
380 }
381
382 EXPORT_SYMBOL(drm_addmap);
383
384 /**
385  * Ioctl to specify a range of memory that is available for mapping by a
386  * non-root process.
387  *
388  * \param inode device inode.
389  * \param file_priv DRM file private.
390  * \param cmd command.
391  * \param arg pointer to a drm_map structure.
392  * \return zero on success or a negative value on error.
393  *
394  */
395 int drm_addmap_ioctl(struct drm_device *dev, void *data,
396                      struct drm_file *file_priv)
397 {
398         struct drm_map *map = data;
399         struct drm_map_list *maplist;
400         int err;
401
402         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
403                 return -EPERM;
404
405         err = drm_addmap_core(dev, map->offset, map->size, map->type,
406                               map->flags, &maplist);
407
408         if (err)
409                 return err;
410
411         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
412         map->handle = (void *)(unsigned long)maplist->user_token;
413         return 0;
414 }
415
416 /**
417  * Remove a map private from list and deallocate resources if the mapping
418  * isn't in use.
419  *
420  * Searches the map on drm_device::maplist, removes it from the list, see if
421  * its being used, and free any associate resource (such as MTRR's) if it's not
422  * being on use.
423  *
424  * \sa drm_addmap
425  */
426 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
427 {
428         struct drm_map_list *r_list = NULL, *list_t;
429         drm_dma_handle_t dmah;
430         int found = 0;
431         struct drm_master *master;
432
433         /* Find the list entry for the map and remove it */
434         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
435                 if (r_list->map == map) {
436                         master = r_list->master;
437                         list_del(&r_list->head);
438                         drm_ht_remove_key(&dev->map_hash,
439                                           r_list->user_token >> PAGE_SHIFT);
440                         kfree(r_list);
441                         found = 1;
442                         break;
443                 }
444         }
445
446         if (!found)
447                 return -EINVAL;
448
449         switch (map->type) {
450         case _DRM_REGISTERS:
451                 iounmap(map->handle);
452                 /* FALLTHROUGH */
453         case _DRM_FRAME_BUFFER:
454                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
455                         int retcode;
456                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
457                         DRM_DEBUG("mtrr_del=%d\n", retcode);
458                 }
459                 break;
460         case _DRM_SHM:
461                 vfree(map->handle);
462                 if (master) {
463                         if (dev->sigdata.lock == master->lock.hw_lock)
464                                 dev->sigdata.lock = NULL;
465                         master->lock.hw_lock = NULL;   /* SHM removed */
466                         master->lock.file_priv = NULL;
467                         wake_up_interruptible_all(&master->lock.lock_queue);
468                 }
469                 break;
470         case _DRM_AGP:
471         case _DRM_SCATTER_GATHER:
472                 break;
473         case _DRM_CONSISTENT:
474                 dmah.vaddr = map->handle;
475                 dmah.busaddr = map->offset;
476                 dmah.size = map->size;
477                 __drm_pci_free(dev, &dmah);
478                 break;
479         case _DRM_GEM:
480                 DRM_ERROR("tried to rmmap GEM object\n");
481                 break;
482         }
483         kfree(map);
484
485         return 0;
486 }
487 EXPORT_SYMBOL(drm_rmmap_locked);
488
489 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
490 {
491         int ret;
492
493         mutex_lock(&dev->struct_mutex);
494         ret = drm_rmmap_locked(dev, map);
495         mutex_unlock(&dev->struct_mutex);
496
497         return ret;
498 }
499 EXPORT_SYMBOL(drm_rmmap);
500
501 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
502  * the last close of the device, and this is necessary for cleanup when things
503  * exit uncleanly.  Therefore, having userland manually remove mappings seems
504  * like a pointless exercise since they're going away anyway.
505  *
506  * One use case might be after addmap is allowed for normal users for SHM and
507  * gets used by drivers that the server doesn't need to care about.  This seems
508  * unlikely.
509  *
510  * \param inode device inode.
511  * \param file_priv DRM file private.
512  * \param cmd command.
513  * \param arg pointer to a struct drm_map structure.
514  * \return zero on success or a negative value on error.
515  */
516 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
517                     struct drm_file *file_priv)
518 {
519         struct drm_map *request = data;
520         struct drm_local_map *map = NULL;
521         struct drm_map_list *r_list;
522         int ret;
523
524         mutex_lock(&dev->struct_mutex);
525         list_for_each_entry(r_list, &dev->maplist, head) {
526                 if (r_list->map &&
527                     r_list->user_token == (unsigned long)request->handle &&
528                     r_list->map->flags & _DRM_REMOVABLE) {
529                         map = r_list->map;
530                         break;
531                 }
532         }
533
534         /* List has wrapped around to the head pointer, or its empty we didn't
535          * find anything.
536          */
537         if (list_empty(&dev->maplist) || !map) {
538                 mutex_unlock(&dev->struct_mutex);
539                 return -EINVAL;
540         }
541
542         /* Register and framebuffer maps are permanent */
543         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
544                 mutex_unlock(&dev->struct_mutex);
545                 return 0;
546         }
547
548         ret = drm_rmmap_locked(dev, map);
549
550         mutex_unlock(&dev->struct_mutex);
551
552         return ret;
553 }
554
555 /**
556  * Cleanup after an error on one of the addbufs() functions.
557  *
558  * \param dev DRM device.
559  * \param entry buffer entry where the error occurred.
560  *
561  * Frees any pages and buffers associated with the given entry.
562  */
563 static void drm_cleanup_buf_error(struct drm_device * dev,
564                                   struct drm_buf_entry * entry)
565 {
566         int i;
567
568         if (entry->seg_count) {
569                 for (i = 0; i < entry->seg_count; i++) {
570                         if (entry->seglist[i]) {
571                                 drm_pci_free(dev, entry->seglist[i]);
572                         }
573                 }
574                 kfree(entry->seglist);
575
576                 entry->seg_count = 0;
577         }
578
579         if (entry->buf_count) {
580                 for (i = 0; i < entry->buf_count; i++) {
581                         kfree(entry->buflist[i].dev_private);
582                 }
583                 kfree(entry->buflist);
584
585                 entry->buf_count = 0;
586         }
587 }
588
589 #if __OS_HAS_AGP
590 /**
591  * Add AGP buffers for DMA transfers.
592  *
593  * \param dev struct drm_device to which the buffers are to be added.
594  * \param request pointer to a struct drm_buf_desc describing the request.
595  * \return zero on success or a negative number on failure.
596  *
597  * After some sanity checks creates a drm_buf structure for each buffer and
598  * reallocates the buffer list of the same size order to accommodate the new
599  * buffers.
600  */
601 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
602 {
603         struct drm_device_dma *dma = dev->dma;
604         struct drm_buf_entry *entry;
605         struct drm_agp_mem *agp_entry;
606         struct drm_buf *buf;
607         unsigned long offset;
608         unsigned long agp_offset;
609         int count;
610         int order;
611         int size;
612         int alignment;
613         int page_order;
614         int total;
615         int byte_count;
616         int i, valid;
617         struct drm_buf **temp_buflist;
618
619         if (!dma)
620                 return -EINVAL;
621
622         count = request->count;
623         order = drm_order(request->size);
624         size = 1 << order;
625
626         alignment = (request->flags & _DRM_PAGE_ALIGN)
627             ? PAGE_ALIGN(size) : size;
628         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
629         total = PAGE_SIZE << page_order;
630
631         byte_count = 0;
632         agp_offset = dev->agp->base + request->agp_start;
633
634         DRM_DEBUG("count:      %d\n", count);
635         DRM_DEBUG("order:      %d\n", order);
636         DRM_DEBUG("size:       %d\n", size);
637         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
638         DRM_DEBUG("alignment:  %d\n", alignment);
639         DRM_DEBUG("page_order: %d\n", page_order);
640         DRM_DEBUG("total:      %d\n", total);
641
642         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
643                 return -EINVAL;
644         if (dev->queue_count)
645                 return -EBUSY;  /* Not while in use */
646
647         /* Make sure buffers are located in AGP memory that we own */
648         valid = 0;
649         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
650                 if ((agp_offset >= agp_entry->bound) &&
651                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
652                         valid = 1;
653                         break;
654                 }
655         }
656         if (!list_empty(&dev->agp->memory) && !valid) {
657                 DRM_DEBUG("zone invalid\n");
658                 return -EINVAL;
659         }
660         spin_lock(&dev->count_lock);
661         if (dev->buf_use) {
662                 spin_unlock(&dev->count_lock);
663                 return -EBUSY;
664         }
665         atomic_inc(&dev->buf_alloc);
666         spin_unlock(&dev->count_lock);
667
668         mutex_lock(&dev->struct_mutex);
669         entry = &dma->bufs[order];
670         if (entry->buf_count) {
671                 mutex_unlock(&dev->struct_mutex);
672                 atomic_dec(&dev->buf_alloc);
673                 return -ENOMEM; /* May only call once for each order */
674         }
675
676         if (count < 0 || count > 4096) {
677                 mutex_unlock(&dev->struct_mutex);
678                 atomic_dec(&dev->buf_alloc);
679                 return -EINVAL;
680         }
681
682         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
683         if (!entry->buflist) {
684                 mutex_unlock(&dev->struct_mutex);
685                 atomic_dec(&dev->buf_alloc);
686                 return -ENOMEM;
687         }
688
689         entry->buf_size = size;
690         entry->page_order = page_order;
691
692         offset = 0;
693
694         while (entry->buf_count < count) {
695                 buf = &entry->buflist[entry->buf_count];
696                 buf->idx = dma->buf_count + entry->buf_count;
697                 buf->total = alignment;
698                 buf->order = order;
699                 buf->used = 0;
700
701                 buf->offset = (dma->byte_count + offset);
702                 buf->bus_address = agp_offset + offset;
703                 buf->address = (void *)(agp_offset + offset);
704                 buf->next = NULL;
705                 buf->waiting = 0;
706                 buf->pending = 0;
707                 init_waitqueue_head(&buf->dma_wait);
708                 buf->file_priv = NULL;
709
710                 buf->dev_priv_size = dev->driver->dev_priv_size;
711                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
712                 if (!buf->dev_private) {
713                         /* Set count correctly so we free the proper amount. */
714                         entry->buf_count = count;
715                         drm_cleanup_buf_error(dev, entry);
716                         mutex_unlock(&dev->struct_mutex);
717                         atomic_dec(&dev->buf_alloc);
718                         return -ENOMEM;
719                 }
720
721                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
722
723                 offset += alignment;
724                 entry->buf_count++;
725                 byte_count += PAGE_SIZE << page_order;
726         }
727
728         DRM_DEBUG("byte_count: %d\n", byte_count);
729
730         temp_buflist = krealloc(dma->buflist,
731                                 (dma->buf_count + entry->buf_count) *
732                                 sizeof(*dma->buflist), GFP_KERNEL);
733         if (!temp_buflist) {
734                 /* Free the entry because it isn't valid */
735                 drm_cleanup_buf_error(dev, entry);
736                 mutex_unlock(&dev->struct_mutex);
737                 atomic_dec(&dev->buf_alloc);
738                 return -ENOMEM;
739         }
740         dma->buflist = temp_buflist;
741
742         for (i = 0; i < entry->buf_count; i++) {
743                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
744         }
745
746         dma->buf_count += entry->buf_count;
747         dma->seg_count += entry->seg_count;
748         dma->page_count += byte_count >> PAGE_SHIFT;
749         dma->byte_count += byte_count;
750
751         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
752         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
753
754         mutex_unlock(&dev->struct_mutex);
755
756         request->count = entry->buf_count;
757         request->size = size;
758
759         dma->flags = _DRM_DMA_USE_AGP;
760
761         atomic_dec(&dev->buf_alloc);
762         return 0;
763 }
764 EXPORT_SYMBOL(drm_addbufs_agp);
765 #endif                          /* __OS_HAS_AGP */
766
767 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
768 {
769         struct drm_device_dma *dma = dev->dma;
770         int count;
771         int order;
772         int size;
773         int total;
774         int page_order;
775         struct drm_buf_entry *entry;
776         drm_dma_handle_t *dmah;
777         struct drm_buf *buf;
778         int alignment;
779         unsigned long offset;
780         int i;
781         int byte_count;
782         int page_count;
783         unsigned long *temp_pagelist;
784         struct drm_buf **temp_buflist;
785
786         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
787                 return -EINVAL;
788
789         if (!dma)
790                 return -EINVAL;
791
792         if (!capable(CAP_SYS_ADMIN))
793                 return -EPERM;
794
795         count = request->count;
796         order = drm_order(request->size);
797         size = 1 << order;
798
799         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
800                   request->count, request->size, size, order, dev->queue_count);
801
802         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
803                 return -EINVAL;
804         if (dev->queue_count)
805                 return -EBUSY;  /* Not while in use */
806
807         alignment = (request->flags & _DRM_PAGE_ALIGN)
808             ? PAGE_ALIGN(size) : size;
809         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
810         total = PAGE_SIZE << page_order;
811
812         spin_lock(&dev->count_lock);
813         if (dev->buf_use) {
814                 spin_unlock(&dev->count_lock);
815                 return -EBUSY;
816         }
817         atomic_inc(&dev->buf_alloc);
818         spin_unlock(&dev->count_lock);
819
820         mutex_lock(&dev->struct_mutex);
821         entry = &dma->bufs[order];
822         if (entry->buf_count) {
823                 mutex_unlock(&dev->struct_mutex);
824                 atomic_dec(&dev->buf_alloc);
825                 return -ENOMEM; /* May only call once for each order */
826         }
827
828         if (count < 0 || count > 4096) {
829                 mutex_unlock(&dev->struct_mutex);
830                 atomic_dec(&dev->buf_alloc);
831                 return -EINVAL;
832         }
833
834         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
835         if (!entry->buflist) {
836                 mutex_unlock(&dev->struct_mutex);
837                 atomic_dec(&dev->buf_alloc);
838                 return -ENOMEM;
839         }
840
841         entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
842         if (!entry->seglist) {
843                 kfree(entry->buflist);
844                 mutex_unlock(&dev->struct_mutex);
845                 atomic_dec(&dev->buf_alloc);
846                 return -ENOMEM;
847         }
848
849         /* Keep the original pagelist until we know all the allocations
850          * have succeeded
851          */
852         temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
853                                sizeof(*dma->pagelist), GFP_KERNEL);
854         if (!temp_pagelist) {
855                 kfree(entry->buflist);
856                 kfree(entry->seglist);
857                 mutex_unlock(&dev->struct_mutex);
858                 atomic_dec(&dev->buf_alloc);
859                 return -ENOMEM;
860         }
861         memcpy(temp_pagelist,
862                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
863         DRM_DEBUG("pagelist: %d entries\n",
864                   dma->page_count + (count << page_order));
865
866         entry->buf_size = size;
867         entry->page_order = page_order;
868         byte_count = 0;
869         page_count = 0;
870
871         while (entry->buf_count < count) {
872
873                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
874
875                 if (!dmah) {
876                         /* Set count correctly so we free the proper amount. */
877                         entry->buf_count = count;
878                         entry->seg_count = count;
879                         drm_cleanup_buf_error(dev, entry);
880                         kfree(temp_pagelist);
881                         mutex_unlock(&dev->struct_mutex);
882                         atomic_dec(&dev->buf_alloc);
883                         return -ENOMEM;
884                 }
885                 entry->seglist[entry->seg_count++] = dmah;
886                 for (i = 0; i < (1 << page_order); i++) {
887                         DRM_DEBUG("page %d @ 0x%08lx\n",
888                                   dma->page_count + page_count,
889                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
890                         temp_pagelist[dma->page_count + page_count++]
891                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
892                 }
893                 for (offset = 0;
894                      offset + size <= total && entry->buf_count < count;
895                      offset += alignment, ++entry->buf_count) {
896                         buf = &entry->buflist[entry->buf_count];
897                         buf->idx = dma->buf_count + entry->buf_count;
898                         buf->total = alignment;
899                         buf->order = order;
900                         buf->used = 0;
901                         buf->offset = (dma->byte_count + byte_count + offset);
902                         buf->address = (void *)(dmah->vaddr + offset);
903                         buf->bus_address = dmah->busaddr + offset;
904                         buf->next = NULL;
905                         buf->waiting = 0;
906                         buf->pending = 0;
907                         init_waitqueue_head(&buf->dma_wait);
908                         buf->file_priv = NULL;
909
910                         buf->dev_priv_size = dev->driver->dev_priv_size;
911                         buf->dev_private = kzalloc(buf->dev_priv_size,
912                                                 GFP_KERNEL);
913                         if (!buf->dev_private) {
914                                 /* Set count correctly so we free the proper amount. */
915                                 entry->buf_count = count;
916                                 entry->seg_count = count;
917                                 drm_cleanup_buf_error(dev, entry);
918                                 kfree(temp_pagelist);
919                                 mutex_unlock(&dev->struct_mutex);
920                                 atomic_dec(&dev->buf_alloc);
921                                 return -ENOMEM;
922                         }
923
924                         DRM_DEBUG("buffer %d @ %p\n",
925                                   entry->buf_count, buf->address);
926                 }
927                 byte_count += PAGE_SIZE << page_order;
928         }
929
930         temp_buflist = krealloc(dma->buflist,
931                                 (dma->buf_count + entry->buf_count) *
932                                 sizeof(*dma->buflist), GFP_KERNEL);
933         if (!temp_buflist) {
934                 /* Free the entry because it isn't valid */
935                 drm_cleanup_buf_error(dev, entry);
936                 kfree(temp_pagelist);
937                 mutex_unlock(&dev->struct_mutex);
938                 atomic_dec(&dev->buf_alloc);
939                 return -ENOMEM;
940         }
941         dma->buflist = temp_buflist;
942
943         for (i = 0; i < entry->buf_count; i++) {
944                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
945         }
946
947         /* No allocations failed, so now we can replace the original pagelist
948          * with the new one.
949          */
950         if (dma->page_count) {
951                 kfree(dma->pagelist);
952         }
953         dma->pagelist = temp_pagelist;
954
955         dma->buf_count += entry->buf_count;
956         dma->seg_count += entry->seg_count;
957         dma->page_count += entry->seg_count << page_order;
958         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
959
960         mutex_unlock(&dev->struct_mutex);
961
962         request->count = entry->buf_count;
963         request->size = size;
964
965         if (request->flags & _DRM_PCI_BUFFER_RO)
966                 dma->flags = _DRM_DMA_USE_PCI_RO;
967
968         atomic_dec(&dev->buf_alloc);
969         return 0;
970
971 }
972 EXPORT_SYMBOL(drm_addbufs_pci);
973
974 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
975 {
976         struct drm_device_dma *dma = dev->dma;
977         struct drm_buf_entry *entry;
978         struct drm_buf *buf;
979         unsigned long offset;
980         unsigned long agp_offset;
981         int count;
982         int order;
983         int size;
984         int alignment;
985         int page_order;
986         int total;
987         int byte_count;
988         int i;
989         struct drm_buf **temp_buflist;
990
991         if (!drm_core_check_feature(dev, DRIVER_SG))
992                 return -EINVAL;
993
994         if (!dma)
995                 return -EINVAL;
996
997         if (!capable(CAP_SYS_ADMIN))
998                 return -EPERM;
999
1000         count = request->count;
1001         order = drm_order(request->size);
1002         size = 1 << order;
1003
1004         alignment = (request->flags & _DRM_PAGE_ALIGN)
1005             ? PAGE_ALIGN(size) : size;
1006         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1007         total = PAGE_SIZE << page_order;
1008
1009         byte_count = 0;
1010         agp_offset = request->agp_start;
1011
1012         DRM_DEBUG("count:      %d\n", count);
1013         DRM_DEBUG("order:      %d\n", order);
1014         DRM_DEBUG("size:       %d\n", size);
1015         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1016         DRM_DEBUG("alignment:  %d\n", alignment);
1017         DRM_DEBUG("page_order: %d\n", page_order);
1018         DRM_DEBUG("total:      %d\n", total);
1019
1020         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1021                 return -EINVAL;
1022         if (dev->queue_count)
1023                 return -EBUSY;  /* Not while in use */
1024
1025         spin_lock(&dev->count_lock);
1026         if (dev->buf_use) {
1027                 spin_unlock(&dev->count_lock);
1028                 return -EBUSY;
1029         }
1030         atomic_inc(&dev->buf_alloc);
1031         spin_unlock(&dev->count_lock);
1032
1033         mutex_lock(&dev->struct_mutex);
1034         entry = &dma->bufs[order];
1035         if (entry->buf_count) {
1036                 mutex_unlock(&dev->struct_mutex);
1037                 atomic_dec(&dev->buf_alloc);
1038                 return -ENOMEM; /* May only call once for each order */
1039         }
1040
1041         if (count < 0 || count > 4096) {
1042                 mutex_unlock(&dev->struct_mutex);
1043                 atomic_dec(&dev->buf_alloc);
1044                 return -EINVAL;
1045         }
1046
1047         entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1048                                 GFP_KERNEL);
1049         if (!entry->buflist) {
1050                 mutex_unlock(&dev->struct_mutex);
1051                 atomic_dec(&dev->buf_alloc);
1052                 return -ENOMEM;
1053         }
1054
1055         entry->buf_size = size;
1056         entry->page_order = page_order;
1057
1058         offset = 0;
1059
1060         while (entry->buf_count < count) {
1061                 buf = &entry->buflist[entry->buf_count];
1062                 buf->idx = dma->buf_count + entry->buf_count;
1063                 buf->total = alignment;
1064                 buf->order = order;
1065                 buf->used = 0;
1066
1067                 buf->offset = (dma->byte_count + offset);
1068                 buf->bus_address = agp_offset + offset;
1069                 buf->address = (void *)(agp_offset + offset
1070                                         + (unsigned long)dev->sg->virtual);
1071                 buf->next = NULL;
1072                 buf->waiting = 0;
1073                 buf->pending = 0;
1074                 init_waitqueue_head(&buf->dma_wait);
1075                 buf->file_priv = NULL;
1076
1077                 buf->dev_priv_size = dev->driver->dev_priv_size;
1078                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1079                 if (!buf->dev_private) {
1080                         /* Set count correctly so we free the proper amount. */
1081                         entry->buf_count = count;
1082                         drm_cleanup_buf_error(dev, entry);
1083                         mutex_unlock(&dev->struct_mutex);
1084                         atomic_dec(&dev->buf_alloc);
1085                         return -ENOMEM;
1086                 }
1087
1088                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1089
1090                 offset += alignment;
1091                 entry->buf_count++;
1092                 byte_count += PAGE_SIZE << page_order;
1093         }
1094
1095         DRM_DEBUG("byte_count: %d\n", byte_count);
1096
1097         temp_buflist = krealloc(dma->buflist,
1098                                 (dma->buf_count + entry->buf_count) *
1099                                 sizeof(*dma->buflist), GFP_KERNEL);
1100         if (!temp_buflist) {
1101                 /* Free the entry because it isn't valid */
1102                 drm_cleanup_buf_error(dev, entry);
1103                 mutex_unlock(&dev->struct_mutex);
1104                 atomic_dec(&dev->buf_alloc);
1105                 return -ENOMEM;
1106         }
1107         dma->buflist = temp_buflist;
1108
1109         for (i = 0; i < entry->buf_count; i++) {
1110                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1111         }
1112
1113         dma->buf_count += entry->buf_count;
1114         dma->seg_count += entry->seg_count;
1115         dma->page_count += byte_count >> PAGE_SHIFT;
1116         dma->byte_count += byte_count;
1117
1118         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1119         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1120
1121         mutex_unlock(&dev->struct_mutex);
1122
1123         request->count = entry->buf_count;
1124         request->size = size;
1125
1126         dma->flags = _DRM_DMA_USE_SG;
1127
1128         atomic_dec(&dev->buf_alloc);
1129         return 0;
1130 }
1131
1132 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1133 {
1134         struct drm_device_dma *dma = dev->dma;
1135         struct drm_buf_entry *entry;
1136         struct drm_buf *buf;
1137         unsigned long offset;
1138         unsigned long agp_offset;
1139         int count;
1140         int order;
1141         int size;
1142         int alignment;
1143         int page_order;
1144         int total;
1145         int byte_count;
1146         int i;
1147         struct drm_buf **temp_buflist;
1148
1149         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1150                 return -EINVAL;
1151
1152         if (!dma)
1153                 return -EINVAL;
1154
1155         if (!capable(CAP_SYS_ADMIN))
1156                 return -EPERM;
1157
1158         count = request->count;
1159         order = drm_order(request->size);
1160         size = 1 << order;
1161
1162         alignment = (request->flags & _DRM_PAGE_ALIGN)
1163             ? PAGE_ALIGN(size) : size;
1164         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1165         total = PAGE_SIZE << page_order;
1166
1167         byte_count = 0;
1168         agp_offset = request->agp_start;
1169
1170         DRM_DEBUG("count:      %d\n", count);
1171         DRM_DEBUG("order:      %d\n", order);
1172         DRM_DEBUG("size:       %d\n", size);
1173         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1174         DRM_DEBUG("alignment:  %d\n", alignment);
1175         DRM_DEBUG("page_order: %d\n", page_order);
1176         DRM_DEBUG("total:      %d\n", total);
1177
1178         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1179                 return -EINVAL;
1180         if (dev->queue_count)
1181                 return -EBUSY;  /* Not while in use */
1182
1183         spin_lock(&dev->count_lock);
1184         if (dev->buf_use) {
1185                 spin_unlock(&dev->count_lock);
1186                 return -EBUSY;
1187         }
1188         atomic_inc(&dev->buf_alloc);
1189         spin_unlock(&dev->count_lock);
1190
1191         mutex_lock(&dev->struct_mutex);
1192         entry = &dma->bufs[order];
1193         if (entry->buf_count) {
1194                 mutex_unlock(&dev->struct_mutex);
1195                 atomic_dec(&dev->buf_alloc);
1196                 return -ENOMEM; /* May only call once for each order */
1197         }
1198
1199         if (count < 0 || count > 4096) {
1200                 mutex_unlock(&dev->struct_mutex);
1201                 atomic_dec(&dev->buf_alloc);
1202                 return -EINVAL;
1203         }
1204
1205         entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1206                                 GFP_KERNEL);
1207         if (!entry->buflist) {
1208                 mutex_unlock(&dev->struct_mutex);
1209                 atomic_dec(&dev->buf_alloc);
1210                 return -ENOMEM;
1211         }
1212
1213         entry->buf_size = size;
1214         entry->page_order = page_order;
1215
1216         offset = 0;
1217
1218         while (entry->buf_count < count) {
1219                 buf = &entry->buflist[entry->buf_count];
1220                 buf->idx = dma->buf_count + entry->buf_count;
1221                 buf->total = alignment;
1222                 buf->order = order;
1223                 buf->used = 0;
1224
1225                 buf->offset = (dma->byte_count + offset);
1226                 buf->bus_address = agp_offset + offset;
1227                 buf->address = (void *)(agp_offset + offset);
1228                 buf->next = NULL;
1229                 buf->waiting = 0;
1230                 buf->pending = 0;
1231                 init_waitqueue_head(&buf->dma_wait);
1232                 buf->file_priv = NULL;
1233
1234                 buf->dev_priv_size = dev->driver->dev_priv_size;
1235                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1236                 if (!buf->dev_private) {
1237                         /* Set count correctly so we free the proper amount. */
1238                         entry->buf_count = count;
1239                         drm_cleanup_buf_error(dev, entry);
1240                         mutex_unlock(&dev->struct_mutex);
1241                         atomic_dec(&dev->buf_alloc);
1242                         return -ENOMEM;
1243                 }
1244
1245                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1246
1247                 offset += alignment;
1248                 entry->buf_count++;
1249                 byte_count += PAGE_SIZE << page_order;
1250         }
1251
1252         DRM_DEBUG("byte_count: %d\n", byte_count);
1253
1254         temp_buflist = krealloc(dma->buflist,
1255                                 (dma->buf_count + entry->buf_count) *
1256                                 sizeof(*dma->buflist), GFP_KERNEL);
1257         if (!temp_buflist) {
1258                 /* Free the entry because it isn't valid */
1259                 drm_cleanup_buf_error(dev, entry);
1260                 mutex_unlock(&dev->struct_mutex);
1261                 atomic_dec(&dev->buf_alloc);
1262                 return -ENOMEM;
1263         }
1264         dma->buflist = temp_buflist;
1265
1266         for (i = 0; i < entry->buf_count; i++) {
1267                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1268         }
1269
1270         dma->buf_count += entry->buf_count;
1271         dma->seg_count += entry->seg_count;
1272         dma->page_count += byte_count >> PAGE_SHIFT;
1273         dma->byte_count += byte_count;
1274
1275         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1276         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1277
1278         mutex_unlock(&dev->struct_mutex);
1279
1280         request->count = entry->buf_count;
1281         request->size = size;
1282
1283         dma->flags = _DRM_DMA_USE_FB;
1284
1285         atomic_dec(&dev->buf_alloc);
1286         return 0;
1287 }
1288
1289
1290 /**
1291  * Add buffers for DMA transfers (ioctl).
1292  *
1293  * \param inode device inode.
1294  * \param file_priv DRM file private.
1295  * \param cmd command.
1296  * \param arg pointer to a struct drm_buf_desc request.
1297  * \return zero on success or a negative number on failure.
1298  *
1299  * According with the memory type specified in drm_buf_desc::flags and the
1300  * build options, it dispatches the call either to addbufs_agp(),
1301  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1302  * PCI memory respectively.
1303  */
1304 int drm_addbufs(struct drm_device *dev, void *data,
1305                 struct drm_file *file_priv)
1306 {
1307         struct drm_buf_desc *request = data;
1308         int ret;
1309
1310         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1311                 return -EINVAL;
1312
1313 #if __OS_HAS_AGP
1314         if (request->flags & _DRM_AGP_BUFFER)
1315                 ret = drm_addbufs_agp(dev, request);
1316         else
1317 #endif
1318         if (request->flags & _DRM_SG_BUFFER)
1319                 ret = drm_addbufs_sg(dev, request);
1320         else if (request->flags & _DRM_FB_BUFFER)
1321                 ret = drm_addbufs_fb(dev, request);
1322         else
1323                 ret = drm_addbufs_pci(dev, request);
1324
1325         return ret;
1326 }
1327
1328 /**
1329  * Get information about the buffer mappings.
1330  *
1331  * This was originally mean for debugging purposes, or by a sophisticated
1332  * client library to determine how best to use the available buffers (e.g.,
1333  * large buffers can be used for image transfer).
1334  *
1335  * \param inode device inode.
1336  * \param file_priv DRM file private.
1337  * \param cmd command.
1338  * \param arg pointer to a drm_buf_info structure.
1339  * \return zero on success or a negative number on failure.
1340  *
1341  * Increments drm_device::buf_use while holding the drm_device::count_lock
1342  * lock, preventing of allocating more buffers after this call. Information
1343  * about each requested buffer is then copied into user space.
1344  */
1345 int drm_infobufs(struct drm_device *dev, void *data,
1346                  struct drm_file *file_priv)
1347 {
1348         struct drm_device_dma *dma = dev->dma;
1349         struct drm_buf_info *request = data;
1350         int i;
1351         int count;
1352
1353         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1354                 return -EINVAL;
1355
1356         if (!dma)
1357                 return -EINVAL;
1358
1359         spin_lock(&dev->count_lock);
1360         if (atomic_read(&dev->buf_alloc)) {
1361                 spin_unlock(&dev->count_lock);
1362                 return -EBUSY;
1363         }
1364         ++dev->buf_use;         /* Can't allocate more after this call */
1365         spin_unlock(&dev->count_lock);
1366
1367         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1368                 if (dma->bufs[i].buf_count)
1369                         ++count;
1370         }
1371
1372         DRM_DEBUG("count = %d\n", count);
1373
1374         if (request->count >= count) {
1375                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1376                         if (dma->bufs[i].buf_count) {
1377                                 struct drm_buf_desc __user *to =
1378                                     &request->list[count];
1379                                 struct drm_buf_entry *from = &dma->bufs[i];
1380                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1381                                 if (copy_to_user(&to->count,
1382                                                  &from->buf_count,
1383                                                  sizeof(from->buf_count)) ||
1384                                     copy_to_user(&to->size,
1385                                                  &from->buf_size,
1386                                                  sizeof(from->buf_size)) ||
1387                                     copy_to_user(&to->low_mark,
1388                                                  &list->low_mark,
1389                                                  sizeof(list->low_mark)) ||
1390                                     copy_to_user(&to->high_mark,
1391                                                  &list->high_mark,
1392                                                  sizeof(list->high_mark)))
1393                                         return -EFAULT;
1394
1395                                 DRM_DEBUG("%d %d %d %d %d\n",
1396                                           i,
1397                                           dma->bufs[i].buf_count,
1398                                           dma->bufs[i].buf_size,
1399                                           dma->bufs[i].freelist.low_mark,
1400                                           dma->bufs[i].freelist.high_mark);
1401                                 ++count;
1402                         }
1403                 }
1404         }
1405         request->count = count;
1406
1407         return 0;
1408 }
1409
1410 /**
1411  * Specifies a low and high water mark for buffer allocation
1412  *
1413  * \param inode device inode.
1414  * \param file_priv DRM file private.
1415  * \param cmd command.
1416  * \param arg a pointer to a drm_buf_desc structure.
1417  * \return zero on success or a negative number on failure.
1418  *
1419  * Verifies that the size order is bounded between the admissible orders and
1420  * updates the respective drm_device_dma::bufs entry low and high water mark.
1421  *
1422  * \note This ioctl is deprecated and mostly never used.
1423  */
1424 int drm_markbufs(struct drm_device *dev, void *data,
1425                  struct drm_file *file_priv)
1426 {
1427         struct drm_device_dma *dma = dev->dma;
1428         struct drm_buf_desc *request = data;
1429         int order;
1430         struct drm_buf_entry *entry;
1431
1432         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1433                 return -EINVAL;
1434
1435         if (!dma)
1436                 return -EINVAL;
1437
1438         DRM_DEBUG("%d, %d, %d\n",
1439                   request->size, request->low_mark, request->high_mark);
1440         order = drm_order(request->size);
1441         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1442                 return -EINVAL;
1443         entry = &dma->bufs[order];
1444
1445         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1446                 return -EINVAL;
1447         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1448                 return -EINVAL;
1449
1450         entry->freelist.low_mark = request->low_mark;
1451         entry->freelist.high_mark = request->high_mark;
1452
1453         return 0;
1454 }
1455
1456 /**
1457  * Unreserve the buffers in list, previously reserved using drmDMA.
1458  *
1459  * \param inode device inode.
1460  * \param file_priv DRM file private.
1461  * \param cmd command.
1462  * \param arg pointer to a drm_buf_free structure.
1463  * \return zero on success or a negative number on failure.
1464  *
1465  * Calls free_buffer() for each used buffer.
1466  * This function is primarily used for debugging.
1467  */
1468 int drm_freebufs(struct drm_device *dev, void *data,
1469                  struct drm_file *file_priv)
1470 {
1471         struct drm_device_dma *dma = dev->dma;
1472         struct drm_buf_free *request = data;
1473         int i;
1474         int idx;
1475         struct drm_buf *buf;
1476
1477         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1478                 return -EINVAL;
1479
1480         if (!dma)
1481                 return -EINVAL;
1482
1483         DRM_DEBUG("%d\n", request->count);
1484         for (i = 0; i < request->count; i++) {
1485                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1486                         return -EFAULT;
1487                 if (idx < 0 || idx >= dma->buf_count) {
1488                         DRM_ERROR("Index %d (of %d max)\n",
1489                                   idx, dma->buf_count - 1);
1490                         return -EINVAL;
1491                 }
1492                 buf = dma->buflist[idx];
1493                 if (buf->file_priv != file_priv) {
1494                         DRM_ERROR("Process %d freeing buffer not owned\n",
1495                                   task_pid_nr(current));
1496                         return -EINVAL;
1497                 }
1498                 drm_free_buffer(dev, buf);
1499         }
1500
1501         return 0;
1502 }
1503
1504 /**
1505  * Maps all of the DMA buffers into client-virtual space (ioctl).
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_map structure.
1511  * \return zero on success or a negative number on failure.
1512  *
1513  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1514  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1515  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1516  * drm_mmap_dma().
1517  */
1518 int drm_mapbufs(struct drm_device *dev, void *data,
1519                 struct drm_file *file_priv)
1520 {
1521         struct drm_device_dma *dma = dev->dma;
1522         int retcode = 0;
1523         const int zero = 0;
1524         unsigned long virtual;
1525         unsigned long address;
1526         struct drm_buf_map *request = data;
1527         int i;
1528
1529         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1530                 return -EINVAL;
1531
1532         if (!dma)
1533                 return -EINVAL;
1534
1535         spin_lock(&dev->count_lock);
1536         if (atomic_read(&dev->buf_alloc)) {
1537                 spin_unlock(&dev->count_lock);
1538                 return -EBUSY;
1539         }
1540         dev->buf_use++;         /* Can't allocate more after this call */
1541         spin_unlock(&dev->count_lock);
1542
1543         if (request->count >= dma->buf_count) {
1544                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1545                     || (drm_core_check_feature(dev, DRIVER_SG)
1546                         && (dma->flags & _DRM_DMA_USE_SG))
1547                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1548                         && (dma->flags & _DRM_DMA_USE_FB))) {
1549                         struct drm_local_map *map = dev->agp_buffer_map;
1550                         unsigned long token = dev->agp_buffer_token;
1551
1552                         if (!map) {
1553                                 retcode = -EINVAL;
1554                                 goto done;
1555                         }
1556                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1557                                           PROT_READ | PROT_WRITE,
1558                                           MAP_SHARED,
1559                                           token);
1560                 } else {
1561                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1562                                           PROT_READ | PROT_WRITE,
1563                                           MAP_SHARED, 0);
1564                 }
1565                 if (virtual > -1024UL) {
1566                         /* Real error */
1567                         retcode = (signed long)virtual;
1568                         goto done;
1569                 }
1570                 request->virtual = (void __user *)virtual;
1571
1572                 for (i = 0; i < dma->buf_count; i++) {
1573                         if (copy_to_user(&request->list[i].idx,
1574                                          &dma->buflist[i]->idx,
1575                                          sizeof(request->list[0].idx))) {
1576                                 retcode = -EFAULT;
1577                                 goto done;
1578                         }
1579                         if (copy_to_user(&request->list[i].total,
1580                                          &dma->buflist[i]->total,
1581                                          sizeof(request->list[0].total))) {
1582                                 retcode = -EFAULT;
1583                                 goto done;
1584                         }
1585                         if (copy_to_user(&request->list[i].used,
1586                                          &zero, sizeof(zero))) {
1587                                 retcode = -EFAULT;
1588                                 goto done;
1589                         }
1590                         address = virtual + dma->buflist[i]->offset;    /* *** */
1591                         if (copy_to_user(&request->list[i].address,
1592                                          &address, sizeof(address))) {
1593                                 retcode = -EFAULT;
1594                                 goto done;
1595                         }
1596                 }
1597         }
1598       done:
1599         request->count = dma->buf_count;
1600         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1601
1602         return retcode;
1603 }
1604
1605 /**
1606  * Compute size order.  Returns the exponent of the smaller power of two which
1607  * is greater or equal to given number.
1608  *
1609  * \param size size.
1610  * \return order.
1611  *
1612  * \todo Can be made faster.
1613  */
1614 int drm_order(unsigned long size)
1615 {
1616         int order;
1617         unsigned long tmp;
1618
1619         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1620
1621         if (size & (size - 1))
1622                 ++order;
1623
1624         return order;
1625 }
1626 EXPORT_SYMBOL(drm_order);