git.oblomov.eu Git - linux-2.6/blob - drivers/gpu/drm/drm_bufs.c

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