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