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