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