git.oblomov.eu Git - linux-2.6/blob - drivers/char/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 && 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->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->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         }
 266         case _DRM_SCATTER_GATHER:
 267                 if (!dev->sg) {
 268                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 269                         return -EINVAL;
 270                 }
 271                 map->offset += (unsigned long)dev->sg->virtual;
 272                 break;
 273         case _DRM_CONSISTENT:
 274                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 275                  * As we're limiting the address to 2^32-1 (or less),
 276                  * casting it down to 32 bits is no problem, but we
 277                  * need to point to a 64bit variable first. */
 278                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 279                 if (!dmah) {
 280                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 281                         return -ENOMEM;
 282                 }
 283                 map->handle = dmah->vaddr;
 284                 map->offset = (unsigned long)dmah->busaddr;
 285                 kfree(dmah);
 286                 break;
 287         default:
 288                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 289                 return -EINVAL;
 290         }
 291
 292         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 293         if (!list) {
 294                 if (map->type == _DRM_REGISTERS)
 295                         iounmap(map->handle);
 296                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 297                 return -EINVAL;
 298         }
 299         memset(list, 0, sizeof(*list));
 300         list->map = map;
 301
 302         mutex_lock(&dev->struct_mutex);
 303         list_add(&list->head, &dev->maplist);
 304
 305         /* Assign a 32-bit handle */
 306         /* We do it here so that dev->struct_mutex protects the increment */
 307         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 308                 map->offset;
 309         ret = drm_map_handle(dev, &list->hash, user_token, 0);
 310         if (ret) {
 311                 if (map->type == _DRM_REGISTERS)
 312                         iounmap(map->handle);
 313                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 314                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 315                 mutex_unlock(&dev->struct_mutex);
 316                 return ret;
 317         }
 318
 319         list->user_token = list->hash.key << PAGE_SHIFT;
 320         mutex_unlock(&dev->struct_mutex);
 321
 322         *maplist = list;
 323         return 0;
 324         }
 325
 326 int drm_addmap(struct drm_device * dev, unsigned int offset,
 327                unsigned int size, enum drm_map_type type,
 328                enum drm_map_flags flags, drm_local_map_t ** map_ptr)
 329 {
 330         struct drm_map_list *list;
 331         int rc;
 332
 333         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 334         if (!rc)
 335                 *map_ptr = list->map;
 336         return rc;
 337 }
 338
 339 EXPORT_SYMBOL(drm_addmap);
 340
 341 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 342                      struct drm_file *file_priv)
 343 {
 344         struct drm_map *map = data;
 345         struct drm_map_list *maplist;
 346         int err;
 347
 348         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP))
 349                 return -EPERM;
 350
 351         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 352                               map->flags, &maplist);
 353
 354         if (err)
 355                 return err;
 356
 357         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 358         map->handle = (void *)(unsigned long)maplist->user_token;
 359         return 0;
 360 }
 361
 362 /**
 363  * Remove a map private from list and deallocate resources if the mapping
 364  * isn't in use.
 365  *
 366  * \param inode device inode.
 367  * \param file_priv DRM file private.
 368  * \param cmd command.
 369  * \param arg pointer to a struct drm_map structure.
 370  * \return zero on success or a negative value on error.
 371  *
 372  * Searches the map on drm_device::maplist, removes it from the list, see if
 373  * its being used, and free any associate resource (such as MTRR's) if it's not
 374  * being on use.
 375  *
 376  * \sa drm_addmap
 377  */
 378 int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
 379 {
 380         struct drm_map_list *r_list = NULL, *list_t;
 381         drm_dma_handle_t dmah;
 382         int found = 0;
 383
 384         /* Find the list entry for the map and remove it */
 385         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 386                 if (r_list->map == map) {
 387                         list_del(&r_list->head);
 388                         drm_ht_remove_key(&dev->map_hash,
 389                                           r_list->user_token >> PAGE_SHIFT);
 390                         drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
 391                         found = 1;
 392                         break;
 393                 }
 394         }
 395
 396         if (!found)
 397                 return -EINVAL;
 398
 399         switch (map->type) {
 400         case _DRM_REGISTERS:
 401                 iounmap(map->handle);
 402                 /* FALLTHROUGH */
 403         case _DRM_FRAME_BUFFER:
 404                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 405                         int retcode;
 406                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 407                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 408                 }
 409                 break;
 410         case _DRM_SHM:
 411                 vfree(map->handle);
 412                 break;
 413         case _DRM_AGP:
 414         case _DRM_SCATTER_GATHER:
 415                 break;
 416         case _DRM_CONSISTENT:
 417                 dmah.vaddr = map->handle;
 418                 dmah.busaddr = map->offset;
 419                 dmah.size = map->size;
 420                 __drm_pci_free(dev, &dmah);
 421                 break;
 422         }
 423         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 424
 425         return 0;
 426 }
 427
 428 int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
 429 {
 430         int ret;
 431
 432         mutex_lock(&dev->struct_mutex);
 433         ret = drm_rmmap_locked(dev, map);
 434         mutex_unlock(&dev->struct_mutex);
 435
 436         return ret;
 437 }
 438 EXPORT_SYMBOL(drm_rmmap);
 439
 440 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 441  * the last close of the device, and this is necessary for cleanup when things
 442  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 443  * like a pointless exercise since they're going away anyway.
 444  *
 445  * One use case might be after addmap is allowed for normal users for SHM and
 446  * gets used by drivers that the server doesn't need to care about.  This seems
 447  * unlikely.
 448  */
 449 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 450                     struct drm_file *file_priv)
 451 {
 452         struct drm_map *request = data;
 453         drm_local_map_t *map = NULL;
 454         struct drm_map_list *r_list;
 455         int ret;
 456
 457         mutex_lock(&dev->struct_mutex);
 458         list_for_each_entry(r_list, &dev->maplist, head) {
 459                 if (r_list->map &&
 460                     r_list->user_token == (unsigned long)request->handle &&
 461                     r_list->map->flags & _DRM_REMOVABLE) {
 462                         map = r_list->map;
 463                         break;
 464                 }
 465         }
 466
 467         /* List has wrapped around to the head pointer, or its empty we didn't
 468          * find anything.
 469          */
 470         if (list_empty(&dev->maplist) || !map) {
 471                 mutex_unlock(&dev->struct_mutex);
 472                 return -EINVAL;
 473         }
 474
 475         /* Register and framebuffer maps are permanent */
 476         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 477                 mutex_unlock(&dev->struct_mutex);
 478                 return 0;
 479         }
 480
 481         ret = drm_rmmap_locked(dev, map);
 482
 483         mutex_unlock(&dev->struct_mutex);
 484
 485         return ret;
 486 }
 487
 488 /**
 489  * Cleanup after an error on one of the addbufs() functions.
 490  *
 491  * \param dev DRM device.
 492  * \param entry buffer entry where the error occurred.
 493  *
 494  * Frees any pages and buffers associated with the given entry.
 495  */
 496 static void drm_cleanup_buf_error(struct drm_device * dev,
 497                                   struct drm_buf_entry * entry)
 498 {
 499         int i;
 500
 501         if (entry->seg_count) {
 502                 for (i = 0; i < entry->seg_count; i++) {
 503                         if (entry->seglist[i]) {
 504                                 drm_pci_free(dev, entry->seglist[i]);
 505                         }
 506                 }
 507                 drm_free(entry->seglist,
 508                          entry->seg_count *
 509                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 510
 511                 entry->seg_count = 0;
 512         }
 513
 514         if (entry->buf_count) {
 515                 for (i = 0; i < entry->buf_count; i++) {
 516                         if (entry->buflist[i].dev_private) {
 517                                 drm_free(entry->buflist[i].dev_private,
 518                                          entry->buflist[i].dev_priv_size,
 519                                          DRM_MEM_BUFS);
 520                         }
 521                 }
 522                 drm_free(entry->buflist,
 523                          entry->buf_count *
 524                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 525
 526                 entry->buf_count = 0;
 527         }
 528 }
 529
 530 #if __OS_HAS_AGP
 531 /**
 532  * Add AGP buffers for DMA transfers.
 533  *
 534  * \param dev struct drm_device to which the buffers are to be added.
 535  * \param request pointer to a struct drm_buf_desc describing the request.
 536  * \return zero on success or a negative number on failure.
 537  *
 538  * After some sanity checks creates a drm_buf structure for each buffer and
 539  * reallocates the buffer list of the same size order to accommodate the new
 540  * buffers.
 541  */
 542 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 543 {
 544         struct drm_device_dma *dma = dev->dma;
 545         struct drm_buf_entry *entry;
 546         struct drm_agp_mem *agp_entry;
 547         struct drm_buf *buf;
 548         unsigned long offset;
 549         unsigned long agp_offset;
 550         int count;
 551         int order;
 552         int size;
 553         int alignment;
 554         int page_order;
 555         int total;
 556         int byte_count;
 557         int i, valid;
 558         struct drm_buf **temp_buflist;
 559
 560         if (!dma)
 561                 return -EINVAL;
 562
 563         count = request->count;
 564         order = drm_order(request->size);
 565         size = 1 << order;
 566
 567         alignment = (request->flags & _DRM_PAGE_ALIGN)
 568             ? PAGE_ALIGN(size) : size;
 569         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 570         total = PAGE_SIZE << page_order;
 571
 572         byte_count = 0;
 573         agp_offset = dev->agp->base + request->agp_start;
 574
 575         DRM_DEBUG("count:      %d\n", count);
 576         DRM_DEBUG("order:      %d\n", order);
 577         DRM_DEBUG("size:       %d\n", size);
 578         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 579         DRM_DEBUG("alignment:  %d\n", alignment);
 580         DRM_DEBUG("page_order: %d\n", page_order);
 581         DRM_DEBUG("total:      %d\n", total);
 582
 583         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 584                 return -EINVAL;
 585         if (dev->queue_count)
 586                 return -EBUSY;  /* Not while in use */
 587
 588         /* Make sure buffers are located in AGP memory that we own */
 589         valid = 0;
 590         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 591                 if ((agp_offset >= agp_entry->bound) &&
 592                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 593                         valid = 1;
 594                         break;
 595                 }
 596         }
 597         if (!list_empty(&dev->agp->memory) && !valid) {
 598                 DRM_DEBUG("zone invalid\n");
 599                 return -EINVAL;
 600         }
 601         spin_lock(&dev->count_lock);
 602         if (dev->buf_use) {
 603                 spin_unlock(&dev->count_lock);
 604                 return -EBUSY;
 605         }
 606         atomic_inc(&dev->buf_alloc);
 607         spin_unlock(&dev->count_lock);
 608
 609         mutex_lock(&dev->struct_mutex);
 610         entry = &dma->bufs[order];
 611         if (entry->buf_count) {
 612                 mutex_unlock(&dev->struct_mutex);
 613                 atomic_dec(&dev->buf_alloc);
 614                 return -ENOMEM; /* May only call once for each order */
 615         }
 616
 617         if (count < 0 || count > 4096) {
 618                 mutex_unlock(&dev->struct_mutex);
 619                 atomic_dec(&dev->buf_alloc);
 620                 return -EINVAL;
 621         }
 622
 623         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 624                                    DRM_MEM_BUFS);
 625         if (!entry->buflist) {
 626                 mutex_unlock(&dev->struct_mutex);
 627                 atomic_dec(&dev->buf_alloc);
 628                 return -ENOMEM;
 629         }
 630         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 631
 632         entry->buf_size = size;
 633         entry->page_order = page_order;
 634
 635         offset = 0;
 636
 637         while (entry->buf_count < count) {
 638                 buf = &entry->buflist[entry->buf_count];
 639                 buf->idx = dma->buf_count + entry->buf_count;
 640                 buf->total = alignment;
 641                 buf->order = order;
 642                 buf->used = 0;
 643
 644                 buf->offset = (dma->byte_count + offset);
 645                 buf->bus_address = agp_offset + offset;
 646                 buf->address = (void *)(agp_offset + offset);
 647                 buf->next = NULL;
 648                 buf->waiting = 0;
 649                 buf->pending = 0;
 650                 init_waitqueue_head(&buf->dma_wait);
 651                 buf->file_priv = NULL;
 652
 653                 buf->dev_priv_size = dev->driver->dev_priv_size;
 654                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 655                 if (!buf->dev_private) {
 656                         /* Set count correctly so we free the proper amount. */
 657                         entry->buf_count = count;
 658                         drm_cleanup_buf_error(dev, entry);
 659                         mutex_unlock(&dev->struct_mutex);
 660                         atomic_dec(&dev->buf_alloc);
 661                         return -ENOMEM;
 662                 }
 663                 memset(buf->dev_private, 0, buf->dev_priv_size);
 664
 665                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 666
 667                 offset += alignment;
 668                 entry->buf_count++;
 669                 byte_count += PAGE_SIZE << page_order;
 670         }
 671
 672         DRM_DEBUG("byte_count: %d\n", byte_count);
 673
 674         temp_buflist = drm_realloc(dma->buflist,
 675                                    dma->buf_count * sizeof(*dma->buflist),
 676                                    (dma->buf_count + entry->buf_count)
 677                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 678         if (!temp_buflist) {
 679                 /* Free the entry because it isn't valid */
 680                 drm_cleanup_buf_error(dev, entry);
 681                 mutex_unlock(&dev->struct_mutex);
 682                 atomic_dec(&dev->buf_alloc);
 683                 return -ENOMEM;
 684         }
 685         dma->buflist = temp_buflist;
 686
 687         for (i = 0; i < entry->buf_count; i++) {
 688                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 689         }
 690
 691         dma->buf_count += entry->buf_count;
 692         dma->seg_count += entry->seg_count;
 693         dma->page_count += byte_count >> PAGE_SHIFT;
 694         dma->byte_count += byte_count;
 695
 696         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 697         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 698
 699         mutex_unlock(&dev->struct_mutex);
 700
 701         request->count = entry->buf_count;
 702         request->size = size;
 703
 704         dma->flags = _DRM_DMA_USE_AGP;
 705
 706         atomic_dec(&dev->buf_alloc);
 707         return 0;
 708 }
 709 EXPORT_SYMBOL(drm_addbufs_agp);
 710 #endif                          /* __OS_HAS_AGP */
 711
 712 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 713 {
 714         struct drm_device_dma *dma = dev->dma;
 715         int count;
 716         int order;
 717         int size;
 718         int total;
 719         int page_order;
 720         struct drm_buf_entry *entry;
 721         drm_dma_handle_t *dmah;
 722         struct drm_buf *buf;
 723         int alignment;
 724         unsigned long offset;
 725         int i;
 726         int byte_count;
 727         int page_count;
 728         unsigned long *temp_pagelist;
 729         struct drm_buf **temp_buflist;
 730
 731         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 732                 return -EINVAL;
 733
 734         if (!dma)
 735                 return -EINVAL;
 736
 737         if (!capable(CAP_SYS_ADMIN))
 738                 return -EPERM;
 739
 740         count = request->count;
 741         order = drm_order(request->size);
 742         size = 1 << order;
 743
 744         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 745                   request->count, request->size, size, order, dev->queue_count);
 746
 747         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 748                 return -EINVAL;
 749         if (dev->queue_count)
 750                 return -EBUSY;  /* Not while in use */
 751
 752         alignment = (request->flags & _DRM_PAGE_ALIGN)
 753             ? PAGE_ALIGN(size) : size;
 754         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 755         total = PAGE_SIZE << page_order;
 756
 757         spin_lock(&dev->count_lock);
 758         if (dev->buf_use) {
 759                 spin_unlock(&dev->count_lock);
 760                 return -EBUSY;
 761         }
 762         atomic_inc(&dev->buf_alloc);
 763         spin_unlock(&dev->count_lock);
 764
 765         mutex_lock(&dev->struct_mutex);
 766         entry = &dma->bufs[order];
 767         if (entry->buf_count) {
 768                 mutex_unlock(&dev->struct_mutex);
 769                 atomic_dec(&dev->buf_alloc);
 770                 return -ENOMEM; /* May only call once for each order */
 771         }
 772
 773         if (count < 0 || count > 4096) {
 774                 mutex_unlock(&dev->struct_mutex);
 775                 atomic_dec(&dev->buf_alloc);
 776                 return -EINVAL;
 777         }
 778
 779         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 780                                    DRM_MEM_BUFS);
 781         if (!entry->buflist) {
 782                 mutex_unlock(&dev->struct_mutex);
 783                 atomic_dec(&dev->buf_alloc);
 784                 return -ENOMEM;
 785         }
 786         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 787
 788         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 789                                    DRM_MEM_SEGS);
 790         if (!entry->seglist) {
 791                 drm_free(entry->buflist,
 792                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 793                 mutex_unlock(&dev->struct_mutex);
 794                 atomic_dec(&dev->buf_alloc);
 795                 return -ENOMEM;
 796         }
 797         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 798
 799         /* Keep the original pagelist until we know all the allocations
 800          * have succeeded
 801          */
 802         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 803                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 804         if (!temp_pagelist) {
 805                 drm_free(entry->buflist,
 806                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 807                 drm_free(entry->seglist,
 808                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 809                 mutex_unlock(&dev->struct_mutex);
 810                 atomic_dec(&dev->buf_alloc);
 811                 return -ENOMEM;
 812         }
 813         memcpy(temp_pagelist,
 814                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 815         DRM_DEBUG("pagelist: %d entries\n",
 816                   dma->page_count + (count << page_order));
 817
 818         entry->buf_size = size;
 819         entry->page_order = page_order;
 820         byte_count = 0;
 821         page_count = 0;
 822
 823         while (entry->buf_count < count) {
 824
 825                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 826
 827                 if (!dmah) {
 828                         /* Set count correctly so we free the proper amount. */
 829                         entry->buf_count = count;
 830                         entry->seg_count = count;
 831                         drm_cleanup_buf_error(dev, entry);
 832                         drm_free(temp_pagelist,
 833                                  (dma->page_count + (count << page_order))
 834                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 835                         mutex_unlock(&dev->struct_mutex);
 836                         atomic_dec(&dev->buf_alloc);
 837                         return -ENOMEM;
 838                 }
 839                 entry->seglist[entry->seg_count++] = dmah;
 840                 for (i = 0; i < (1 << page_order); i++) {
 841                         DRM_DEBUG("page %d @ 0x%08lx\n",
 842                                   dma->page_count + page_count,
 843                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 844                         temp_pagelist[dma->page_count + page_count++]
 845                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 846                 }
 847                 for (offset = 0;
 848                      offset + size <= total && entry->buf_count < count;
 849                      offset += alignment, ++entry->buf_count) {
 850                         buf = &entry->buflist[entry->buf_count];
 851                         buf->idx = dma->buf_count + entry->buf_count;
 852                         buf->total = alignment;
 853                         buf->order = order;
 854                         buf->used = 0;
 855                         buf->offset = (dma->byte_count + byte_count + offset);
 856                         buf->address = (void *)(dmah->vaddr + offset);
 857                         buf->bus_address = dmah->busaddr + offset;
 858                         buf->next = NULL;
 859                         buf->waiting = 0;
 860                         buf->pending = 0;
 861                         init_waitqueue_head(&buf->dma_wait);
 862                         buf->file_priv = NULL;
 863
 864                         buf->dev_priv_size = dev->driver->dev_priv_size;
 865                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 866                                                      DRM_MEM_BUFS);
 867                         if (!buf->dev_private) {
 868                                 /* Set count correctly so we free the proper amount. */
 869                                 entry->buf_count = count;
 870                                 entry->seg_count = count;
 871                                 drm_cleanup_buf_error(dev, entry);
 872                                 drm_free(temp_pagelist,
 873                                          (dma->page_count +
 874                                           (count << page_order))
 875                                          * sizeof(*dma->pagelist),
 876                                          DRM_MEM_PAGES);
 877                                 mutex_unlock(&dev->struct_mutex);
 878                                 atomic_dec(&dev->buf_alloc);
 879                                 return -ENOMEM;
 880                         }
 881                         memset(buf->dev_private, 0, buf->dev_priv_size);
 882
 883                         DRM_DEBUG("buffer %d @ %p\n",
 884                                   entry->buf_count, buf->address);
 885                 }
 886                 byte_count += PAGE_SIZE << page_order;
 887         }
 888
 889         temp_buflist = drm_realloc(dma->buflist,
 890                                    dma->buf_count * sizeof(*dma->buflist),
 891                                    (dma->buf_count + entry->buf_count)
 892                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 893         if (!temp_buflist) {
 894                 /* Free the entry because it isn't valid */
 895                 drm_cleanup_buf_error(dev, entry);
 896                 drm_free(temp_pagelist,
 897                          (dma->page_count + (count << page_order))
 898                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 899                 mutex_unlock(&dev->struct_mutex);
 900                 atomic_dec(&dev->buf_alloc);
 901                 return -ENOMEM;
 902         }
 903         dma->buflist = temp_buflist;
 904
 905         for (i = 0; i < entry->buf_count; i++) {
 906                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 907         }
 908
 909         /* No allocations failed, so now we can replace the orginal pagelist
 910          * with the new one.
 911          */
 912         if (dma->page_count) {
 913                 drm_free(dma->pagelist,
 914                          dma->page_count * sizeof(*dma->pagelist),
 915                          DRM_MEM_PAGES);
 916         }
 917         dma->pagelist = temp_pagelist;
 918
 919         dma->buf_count += entry->buf_count;
 920         dma->seg_count += entry->seg_count;
 921         dma->page_count += entry->seg_count << page_order;
 922         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 923
 924         mutex_unlock(&dev->struct_mutex);
 925
 926         request->count = entry->buf_count;
 927         request->size = size;
 928
 929         if (request->flags & _DRM_PCI_BUFFER_RO)
 930                 dma->flags = _DRM_DMA_USE_PCI_RO;
 931
 932         atomic_dec(&dev->buf_alloc);
 933         return 0;
 934
 935 }
 936 EXPORT_SYMBOL(drm_addbufs_pci);
 937
 938 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 939 {
 940         struct drm_device_dma *dma = dev->dma;
 941         struct drm_buf_entry *entry;
 942         struct drm_buf *buf;
 943         unsigned long offset;
 944         unsigned long agp_offset;
 945         int count;
 946         int order;
 947         int size;
 948         int alignment;
 949         int page_order;
 950         int total;
 951         int byte_count;
 952         int i;
 953         struct drm_buf **temp_buflist;
 954
 955         if (!drm_core_check_feature(dev, DRIVER_SG))
 956                 return -EINVAL;
 957
 958         if (!dma)
 959                 return -EINVAL;
 960
 961         if (!capable(CAP_SYS_ADMIN))
 962                 return -EPERM;
 963
 964         count = request->count;
 965         order = drm_order(request->size);
 966         size = 1 << order;
 967
 968         alignment = (request->flags & _DRM_PAGE_ALIGN)
 969             ? PAGE_ALIGN(size) : size;
 970         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 971         total = PAGE_SIZE << page_order;
 972
 973         byte_count = 0;
 974         agp_offset = request->agp_start;
 975
 976         DRM_DEBUG("count:      %d\n", count);
 977         DRM_DEBUG("order:      %d\n", order);
 978         DRM_DEBUG("size:       %d\n", size);
 979         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 980         DRM_DEBUG("alignment:  %d\n", alignment);
 981         DRM_DEBUG("page_order: %d\n", page_order);
 982         DRM_DEBUG("total:      %d\n", total);
 983
 984         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 985                 return -EINVAL;
 986         if (dev->queue_count)
 987                 return -EBUSY;  /* Not while in use */
 988
 989         spin_lock(&dev->count_lock);
 990         if (dev->buf_use) {
 991                 spin_unlock(&dev->count_lock);
 992                 return -EBUSY;
 993         }
 994         atomic_inc(&dev->buf_alloc);
 995         spin_unlock(&dev->count_lock);
 996
 997         mutex_lock(&dev->struct_mutex);
 998         entry = &dma->bufs[order];
 999         if (entry->buf_count) {
1000                 mutex_unlock(&dev->struct_mutex);
1001                 atomic_dec(&dev->buf_alloc);
1002                 return -ENOMEM; /* May only call once for each order */
1003         }
1004
1005         if (count < 0 || count > 4096) {
1006                 mutex_unlock(&dev->struct_mutex);
1007                 atomic_dec(&dev->buf_alloc);
1008                 return -EINVAL;
1009         }
1010
1011         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1012                                    DRM_MEM_BUFS);
1013         if (!entry->buflist) {
1014                 mutex_unlock(&dev->struct_mutex);
1015                 atomic_dec(&dev->buf_alloc);
1016                 return -ENOMEM;
1017         }
1018         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1019
1020         entry->buf_size = size;
1021         entry->page_order = page_order;
1022
1023         offset = 0;
1024
1025         while (entry->buf_count < count) {
1026                 buf = &entry->buflist[entry->buf_count];
1027                 buf->idx = dma->buf_count + entry->buf_count;
1028                 buf->total = alignment;
1029                 buf->order = order;
1030                 buf->used = 0;
1031
1032                 buf->offset = (dma->byte_count + offset);
1033                 buf->bus_address = agp_offset + offset;
1034                 buf->address = (void *)(agp_offset + offset
1035                                         + (unsigned long)dev->sg->virtual);
1036                 buf->next = NULL;
1037                 buf->waiting = 0;
1038                 buf->pending = 0;
1039                 init_waitqueue_head(&buf->dma_wait);
1040                 buf->file_priv = NULL;
1041
1042                 buf->dev_priv_size = dev->driver->dev_priv_size;
1043                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1044                 if (!buf->dev_private) {
1045                         /* Set count correctly so we free the proper amount. */
1046                         entry->buf_count = count;
1047                         drm_cleanup_buf_error(dev, entry);
1048                         mutex_unlock(&dev->struct_mutex);
1049                         atomic_dec(&dev->buf_alloc);
1050                         return -ENOMEM;
1051                 }
1052
1053                 memset(buf->dev_private, 0, buf->dev_priv_size);
1054
1055                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1056
1057                 offset += alignment;
1058                 entry->buf_count++;
1059                 byte_count += PAGE_SIZE << page_order;
1060         }
1061
1062         DRM_DEBUG("byte_count: %d\n", byte_count);
1063
1064         temp_buflist = drm_realloc(dma->buflist,
1065                                    dma->buf_count * sizeof(*dma->buflist),
1066                                    (dma->buf_count + entry->buf_count)
1067                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1068         if (!temp_buflist) {
1069                 /* Free the entry because it isn't valid */
1070                 drm_cleanup_buf_error(dev, entry);
1071                 mutex_unlock(&dev->struct_mutex);
1072                 atomic_dec(&dev->buf_alloc);
1073                 return -ENOMEM;
1074         }
1075         dma->buflist = temp_buflist;
1076
1077         for (i = 0; i < entry->buf_count; i++) {
1078                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1079         }
1080
1081         dma->buf_count += entry->buf_count;
1082         dma->seg_count += entry->seg_count;
1083         dma->page_count += byte_count >> PAGE_SHIFT;
1084         dma->byte_count += byte_count;
1085
1086         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1087         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1088
1089         mutex_unlock(&dev->struct_mutex);
1090
1091         request->count = entry->buf_count;
1092         request->size = size;
1093
1094         dma->flags = _DRM_DMA_USE_SG;
1095
1096         atomic_dec(&dev->buf_alloc);
1097         return 0;
1098 }
1099
1100 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1101 {
1102         struct drm_device_dma *dma = dev->dma;
1103         struct drm_buf_entry *entry;
1104         struct drm_buf *buf;
1105         unsigned long offset;
1106         unsigned long agp_offset;
1107         int count;
1108         int order;
1109         int size;
1110         int alignment;
1111         int page_order;
1112         int total;
1113         int byte_count;
1114         int i;
1115         struct drm_buf **temp_buflist;
1116
1117         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1118                 return -EINVAL;
1119
1120         if (!dma)
1121                 return -EINVAL;
1122
1123         if (!capable(CAP_SYS_ADMIN))
1124                 return -EPERM;
1125
1126         count = request->count;
1127         order = drm_order(request->size);
1128         size = 1 << order;
1129
1130         alignment = (request->flags & _DRM_PAGE_ALIGN)
1131             ? PAGE_ALIGN(size) : size;
1132         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1133         total = PAGE_SIZE << page_order;
1134
1135         byte_count = 0;
1136         agp_offset = request->agp_start;
1137
1138         DRM_DEBUG("count:      %d\n", count);
1139         DRM_DEBUG("order:      %d\n", order);
1140         DRM_DEBUG("size:       %d\n", size);
1141         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1142         DRM_DEBUG("alignment:  %d\n", alignment);
1143         DRM_DEBUG("page_order: %d\n", page_order);
1144         DRM_DEBUG("total:      %d\n", total);
1145
1146         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1147                 return -EINVAL;
1148         if (dev->queue_count)
1149                 return -EBUSY;  /* Not while in use */
1150
1151         spin_lock(&dev->count_lock);
1152         if (dev->buf_use) {
1153                 spin_unlock(&dev->count_lock);
1154                 return -EBUSY;
1155         }
1156         atomic_inc(&dev->buf_alloc);
1157         spin_unlock(&dev->count_lock);
1158
1159         mutex_lock(&dev->struct_mutex);
1160         entry = &dma->bufs[order];
1161         if (entry->buf_count) {
1162                 mutex_unlock(&dev->struct_mutex);
1163                 atomic_dec(&dev->buf_alloc);
1164                 return -ENOMEM; /* May only call once for each order */
1165         }
1166
1167         if (count < 0 || count > 4096) {
1168                 mutex_unlock(&dev->struct_mutex);
1169                 atomic_dec(&dev->buf_alloc);
1170                 return -EINVAL;
1171         }
1172
1173         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1174                                    DRM_MEM_BUFS);
1175         if (!entry->buflist) {
1176                 mutex_unlock(&dev->struct_mutex);
1177                 atomic_dec(&dev->buf_alloc);
1178                 return -ENOMEM;
1179         }
1180         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1181
1182         entry->buf_size = size;
1183         entry->page_order = page_order;
1184
1185         offset = 0;
1186
1187         while (entry->buf_count < count) {
1188                 buf = &entry->buflist[entry->buf_count];
1189                 buf->idx = dma->buf_count + entry->buf_count;
1190                 buf->total = alignment;
1191                 buf->order = order;
1192                 buf->used = 0;
1193
1194                 buf->offset = (dma->byte_count + offset);
1195                 buf->bus_address = agp_offset + offset;
1196                 buf->address = (void *)(agp_offset + offset);
1197                 buf->next = NULL;
1198                 buf->waiting = 0;
1199                 buf->pending = 0;
1200                 init_waitqueue_head(&buf->dma_wait);
1201                 buf->file_priv = NULL;
1202
1203                 buf->dev_priv_size = dev->driver->dev_priv_size;
1204                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1205                 if (!buf->dev_private) {
1206                         /* Set count correctly so we free the proper amount. */
1207                         entry->buf_count = count;
1208                         drm_cleanup_buf_error(dev, entry);
1209                         mutex_unlock(&dev->struct_mutex);
1210                         atomic_dec(&dev->buf_alloc);
1211                         return -ENOMEM;
1212                 }
1213                 memset(buf->dev_private, 0, buf->dev_priv_size);
1214
1215                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1216
1217                 offset += alignment;
1218                 entry->buf_count++;
1219                 byte_count += PAGE_SIZE << page_order;
1220         }
1221
1222         DRM_DEBUG("byte_count: %d\n", byte_count);
1223
1224         temp_buflist = drm_realloc(dma->buflist,
1225                                    dma->buf_count * sizeof(*dma->buflist),
1226                                    (dma->buf_count + entry->buf_count)
1227                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1228         if (!temp_buflist) {
1229                 /* Free the entry because it isn't valid */
1230                 drm_cleanup_buf_error(dev, entry);
1231                 mutex_unlock(&dev->struct_mutex);
1232                 atomic_dec(&dev->buf_alloc);
1233                 return -ENOMEM;
1234         }
1235         dma->buflist = temp_buflist;
1236
1237         for (i = 0; i < entry->buf_count; i++) {
1238                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1239         }
1240
1241         dma->buf_count += entry->buf_count;
1242         dma->seg_count += entry->seg_count;
1243         dma->page_count += byte_count >> PAGE_SHIFT;
1244         dma->byte_count += byte_count;
1245
1246         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1247         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1248
1249         mutex_unlock(&dev->struct_mutex);
1250
1251         request->count = entry->buf_count;
1252         request->size = size;
1253
1254         dma->flags = _DRM_DMA_USE_FB;
1255
1256         atomic_dec(&dev->buf_alloc);
1257         return 0;
1258 }
1259
1260
1261 /**
1262  * Add buffers for DMA transfers (ioctl).
1263  *
1264  * \param inode device inode.
1265  * \param file_priv DRM file private.
1266  * \param cmd command.
1267  * \param arg pointer to a struct drm_buf_desc request.
1268  * \return zero on success or a negative number on failure.
1269  *
1270  * According with the memory type specified in drm_buf_desc::flags and the
1271  * build options, it dispatches the call either to addbufs_agp(),
1272  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1273  * PCI memory respectively.
1274  */
1275 int drm_addbufs(struct drm_device *dev, void *data,
1276                 struct drm_file *file_priv)
1277 {
1278         struct drm_buf_desc *request = data;
1279         int ret;
1280
1281         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1282                 return -EINVAL;
1283
1284 #if __OS_HAS_AGP
1285         if (request->flags & _DRM_AGP_BUFFER)
1286                 ret = drm_addbufs_agp(dev, request);
1287         else
1288 #endif
1289         if (request->flags & _DRM_SG_BUFFER)
1290                 ret = drm_addbufs_sg(dev, request);
1291         else if (request->flags & _DRM_FB_BUFFER)
1292                 ret = drm_addbufs_fb(dev, request);
1293         else
1294                 ret = drm_addbufs_pci(dev, request);
1295
1296         return ret;
1297 }
1298
1299 /**
1300  * Get information about the buffer mappings.
1301  *
1302  * This was originally mean for debugging purposes, or by a sophisticated
1303  * client library to determine how best to use the available buffers (e.g.,
1304  * large buffers can be used for image transfer).
1305  *
1306  * \param inode device inode.
1307  * \param file_priv DRM file private.
1308  * \param cmd command.
1309  * \param arg pointer to a drm_buf_info structure.
1310  * \return zero on success or a negative number on failure.
1311  *
1312  * Increments drm_device::buf_use while holding the drm_device::count_lock
1313  * lock, preventing of allocating more buffers after this call. Information
1314  * about each requested buffer is then copied into user space.
1315  */
1316 int drm_infobufs(struct drm_device *dev, void *data,
1317                  struct drm_file *file_priv)
1318 {
1319         struct drm_device_dma *dma = dev->dma;
1320         struct drm_buf_info *request = data;
1321         int i;
1322         int count;
1323
1324         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1325                 return -EINVAL;
1326
1327         if (!dma)
1328                 return -EINVAL;
1329
1330         spin_lock(&dev->count_lock);
1331         if (atomic_read(&dev->buf_alloc)) {
1332                 spin_unlock(&dev->count_lock);
1333                 return -EBUSY;
1334         }
1335         ++dev->buf_use;         /* Can't allocate more after this call */
1336         spin_unlock(&dev->count_lock);
1337
1338         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1339                 if (dma->bufs[i].buf_count)
1340                         ++count;
1341         }
1342
1343         DRM_DEBUG("count = %d\n", count);
1344
1345         if (request->count >= count) {
1346                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1347                         if (dma->bufs[i].buf_count) {
1348                                 struct drm_buf_desc __user *to =
1349                                     &request->list[count];
1350                                 struct drm_buf_entry *from = &dma->bufs[i];
1351                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1352                                 if (copy_to_user(&to->count,
1353                                                  &from->buf_count,
1354                                                  sizeof(from->buf_count)) ||
1355                                     copy_to_user(&to->size,
1356                                                  &from->buf_size,
1357                                                  sizeof(from->buf_size)) ||
1358                                     copy_to_user(&to->low_mark,
1359                                                  &list->low_mark,
1360                                                  sizeof(list->low_mark)) ||
1361                                     copy_to_user(&to->high_mark,
1362                                                  &list->high_mark,
1363                                                  sizeof(list->high_mark)))
1364                                         return -EFAULT;
1365
1366                                 DRM_DEBUG("%d %d %d %d %d\n",
1367                                           i,
1368                                           dma->bufs[i].buf_count,
1369                                           dma->bufs[i].buf_size,
1370                                           dma->bufs[i].freelist.low_mark,
1371                                           dma->bufs[i].freelist.high_mark);
1372                                 ++count;
1373                         }
1374                 }
1375         }
1376         request->count = count;
1377
1378         return 0;
1379 }
1380
1381 /**
1382  * Specifies a low and high water mark for buffer allocation
1383  *
1384  * \param inode device inode.
1385  * \param file_priv DRM file private.
1386  * \param cmd command.
1387  * \param arg a pointer to a drm_buf_desc structure.
1388  * \return zero on success or a negative number on failure.
1389  *
1390  * Verifies that the size order is bounded between the admissible orders and
1391  * updates the respective drm_device_dma::bufs entry low and high water mark.
1392  *
1393  * \note This ioctl is deprecated and mostly never used.
1394  */
1395 int drm_markbufs(struct drm_device *dev, void *data,
1396                  struct drm_file *file_priv)
1397 {
1398         struct drm_device_dma *dma = dev->dma;
1399         struct drm_buf_desc *request = data;
1400         int order;
1401         struct drm_buf_entry *entry;
1402
1403         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1404                 return -EINVAL;
1405
1406         if (!dma)
1407                 return -EINVAL;
1408
1409         DRM_DEBUG("%d, %d, %d\n",
1410                   request->size, request->low_mark, request->high_mark);
1411         order = drm_order(request->size);
1412         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1413                 return -EINVAL;
1414         entry = &dma->bufs[order];
1415
1416         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1417                 return -EINVAL;
1418         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1419                 return -EINVAL;
1420
1421         entry->freelist.low_mark = request->low_mark;
1422         entry->freelist.high_mark = request->high_mark;
1423
1424         return 0;
1425 }
1426
1427 /**
1428  * Unreserve the buffers in list, previously reserved using drmDMA.
1429  *
1430  * \param inode device inode.
1431  * \param file_priv DRM file private.
1432  * \param cmd command.
1433  * \param arg pointer to a drm_buf_free structure.
1434  * \return zero on success or a negative number on failure.
1435  *
1436  * Calls free_buffer() for each used buffer.
1437  * This function is primarily used for debugging.
1438  */
1439 int drm_freebufs(struct drm_device *dev, void *data,
1440                  struct drm_file *file_priv)
1441 {
1442         struct drm_device_dma *dma = dev->dma;
1443         struct drm_buf_free *request = data;
1444         int i;
1445         int idx;
1446         struct drm_buf *buf;
1447
1448         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1449                 return -EINVAL;
1450
1451         if (!dma)
1452                 return -EINVAL;
1453
1454         DRM_DEBUG("%d\n", request->count);
1455         for (i = 0; i < request->count; i++) {
1456                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1457                         return -EFAULT;
1458                 if (idx < 0 || idx >= dma->buf_count) {
1459                         DRM_ERROR("Index %d (of %d max)\n",
1460                                   idx, dma->buf_count - 1);
1461                         return -EINVAL;
1462                 }
1463                 buf = dma->buflist[idx];
1464                 if (buf->file_priv != file_priv) {
1465                         DRM_ERROR("Process %d freeing buffer not owned\n",
1466                                   task_pid_nr(current));
1467                         return -EINVAL;
1468                 }
1469                 drm_free_buffer(dev, buf);
1470         }
1471
1472         return 0;
1473 }
1474
1475 /**
1476  * Maps all of the DMA buffers into client-virtual space (ioctl).
1477  *
1478  * \param inode device inode.
1479  * \param file_priv DRM file private.
1480  * \param cmd command.
1481  * \param arg pointer to a drm_buf_map structure.
1482  * \return zero on success or a negative number on failure.
1483  *
1484  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1485  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1486  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1487  * drm_mmap_dma().
1488  */
1489 int drm_mapbufs(struct drm_device *dev, void *data,
1490                 struct drm_file *file_priv)
1491 {
1492         struct drm_device_dma *dma = dev->dma;
1493         int retcode = 0;
1494         const int zero = 0;
1495         unsigned long virtual;
1496         unsigned long address;
1497         struct drm_buf_map *request = data;
1498         int i;
1499
1500         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1501                 return -EINVAL;
1502
1503         if (!dma)
1504                 return -EINVAL;
1505
1506         spin_lock(&dev->count_lock);
1507         if (atomic_read(&dev->buf_alloc)) {
1508                 spin_unlock(&dev->count_lock);
1509                 return -EBUSY;
1510         }
1511         dev->buf_use++;         /* Can't allocate more after this call */
1512         spin_unlock(&dev->count_lock);
1513
1514         if (request->count >= dma->buf_count) {
1515                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1516                     || (drm_core_check_feature(dev, DRIVER_SG)
1517                         && (dma->flags & _DRM_DMA_USE_SG))
1518                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1519                         && (dma->flags & _DRM_DMA_USE_FB))) {
1520                         struct drm_map *map = dev->agp_buffer_map;
1521                         unsigned long token = dev->agp_buffer_token;
1522
1523                         if (!map) {
1524                                 retcode = -EINVAL;
1525                                 goto done;
1526                         }
1527                         down_write(&current->mm->mmap_sem);
1528                         virtual = do_mmap(file_priv->filp, 0, map->size,
1529                                           PROT_READ | PROT_WRITE,
1530                                           MAP_SHARED,
1531                                           token);
1532                         up_write(&current->mm->mmap_sem);
1533                 } else {
1534                         down_write(&current->mm->mmap_sem);
1535                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1536                                           PROT_READ | PROT_WRITE,
1537                                           MAP_SHARED, 0);
1538                         up_write(&current->mm->mmap_sem);
1539                 }
1540                 if (virtual > -1024UL) {
1541                         /* Real error */
1542                         retcode = (signed long)virtual;
1543                         goto done;
1544                 }
1545                 request->virtual = (void __user *)virtual;
1546
1547                 for (i = 0; i < dma->buf_count; i++) {
1548                         if (copy_to_user(&request->list[i].idx,
1549                                          &dma->buflist[i]->idx,
1550                                          sizeof(request->list[0].idx))) {
1551                                 retcode = -EFAULT;
1552                                 goto done;
1553                         }
1554                         if (copy_to_user(&request->list[i].total,
1555                                          &dma->buflist[i]->total,
1556                                          sizeof(request->list[0].total))) {
1557                                 retcode = -EFAULT;
1558                                 goto done;
1559                         }
1560                         if (copy_to_user(&request->list[i].used,
1561                                          &zero, sizeof(zero))) {
1562                                 retcode = -EFAULT;
1563                                 goto done;
1564                         }
1565                         address = virtual + dma->buflist[i]->offset;    /* *** */
1566                         if (copy_to_user(&request->list[i].address,
1567                                          &address, sizeof(address))) {
1568                                 retcode = -EFAULT;
1569                                 goto done;
1570                         }
1571                 }
1572         }
1573       done:
1574         request->count = dma->buf_count;
1575         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1576
1577         return retcode;
1578 }
1579
1580 /**
1581  * Compute size order.  Returns the exponent of the smaller power of two which
1582  * is greater or equal to given number.
1583  *
1584  * \param size size.
1585  * \return order.
1586  *
1587  * \todo Can be made faster.
1588  */
1589 int drm_order(unsigned long size)
1590 {
1591         int order;
1592         unsigned long tmp;
1593
1594         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1595
1596         if (size & (size - 1))
1597                 ++order;
1598
1599         return order;
1600 }
1601 EXPORT_SYMBOL(drm_order);