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