drivers/gpu/drm/drm_bufs.c

   1 /**
   2  * \file drm_bufs.c
   3  * Generic buffer template
   4  *
   5  * \author Rickard E. (Rik) Faith <[email protected]>
   6  * \author Gareth Hughes <[email protected]>
   7  */
   8
   9 /*
  10  * Created: Thu Nov 23 03:10:50 2000 by [email protected]
  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 <linux/slab.h>
  38 #include <linux/log2.h>
  39 #include <linux/export.h>
  40 #include <asm/shmparam.h>
  41 #include <drm/drmP.h>
  42
  43 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  44                                                   struct drm_local_map *map)
  45 {
  46         struct drm_map_list *entry;
  47         list_for_each_entry(entry, &dev->maplist, head) {
  48                 /*
  49                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  50                  * while PCI resources may live above that, we only compare the
  51                  * lower 32 bits of the map offset for maps of type
  52                  * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  53                  * It is assumed that if a driver have more than one resource
  54                  * of each type, the lower 32 bits are different.
  55                  */
  56                 if (!entry->map ||
  57                     map->type != entry->map->type ||
  58                     entry->master != dev->primary->master)
  59                         continue;
  60                 switch (map->type) {
  61                 case _DRM_SHM:
  62                         if (map->flags != _DRM_CONTAINS_LOCK)
  63                                 break;
  64                         return entry;
  65                 case _DRM_REGISTERS:
  66                 case _DRM_FRAME_BUFFER:
  67                         if ((entry->map->offset & 0xffffffff) ==
  68                             (map->offset & 0xffffffff))
  69                                 return entry;
  70                 default: /* Make gcc happy */
  71                         ;
  72                 }
  73                 if (entry->map->offset == map->offset)
  74                         return entry;
  75         }
  76
  77         return NULL;
  78 }
  79
  80 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  81                           unsigned long user_token, int hashed_handle, int shm)
  82 {
  83         int use_hashed_handle, shift;
  84         unsigned long add;
  85
  86 #if (BITS_PER_LONG == 64)
  87         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  88 #elif (BITS_PER_LONG == 32)
  89         use_hashed_handle = hashed_handle;
  90 #else
  91 #error Unsupported long size. Neither 64 nor 32 bits.
  92 #endif
  93
  94         if (!use_hashed_handle) {
  95                 int ret;
  96                 hash->key = user_token >> PAGE_SHIFT;
  97                 ret = drm_ht_insert_item(&dev->map_hash, hash);
  98                 if (ret != -EINVAL)
  99                         return ret;
 100         }
 101
 102         shift = 0;
 103         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 104         if (shm && (SHMLBA > PAGE_SIZE)) {
 105                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 106
 107                 /* For shared memory, we have to preserve the SHMLBA
 108                  * bits of the eventual vma->vm_pgoff value during
 109                  * mmap().  Otherwise we run into cache aliasing problems
 110                  * on some platforms.  On these platforms, the pgoff of
 111                  * a mmap() request is used to pick a suitable virtual
 112                  * address for the mmap() region such that it will not
 113                  * cause cache aliasing problems.
 114                  *
 115                  * Therefore, make sure the SHMLBA relevant bits of the
 116                  * hash value we use are equal to those in the original
 117                  * kernel virtual address.
 118                  */
 119                 shift = bits;
 120                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 121         }
 122
 123         return drm_ht_just_insert_please(&dev->map_hash, hash,
 124                                          user_token, 32 - PAGE_SHIFT - 3,
 125                                          shift, add);
 126 }
 127
 128 /**
 129  * Core function to create a range of memory available for mapping by a
 130  * non-root process.
 131  *
 132  * Adjusts the memory offset to its absolute value according to the mapping
 133  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 134  * applicable and if supported by the kernel.
 135  */
 136 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 137                            unsigned int size, enum drm_map_type type,
 138                            enum drm_map_flags flags,
 139                            struct drm_map_list ** maplist)
 140 {
 141         struct drm_local_map *map;
 142         struct drm_map_list *list;
 143         drm_dma_handle_t *dmah;
 144         unsigned long user_token;
 145         int ret;
 146
 147         map = kmalloc(sizeof(*map), GFP_KERNEL);
 148         if (!map)
 149                 return -ENOMEM;
 150
 151         map->offset = offset;
 152         map->size = size;
 153         map->flags = flags;
 154         map->type = type;
 155
 156         /* Only allow shared memory to be removable since we only keep enough
 157          * book keeping information about shared memory to allow for removal
 158          * when processes fork.
 159          */
 160         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 161                 kfree(map);
 162                 return -EINVAL;
 163         }
 164         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 165                   (unsigned long long)map->offset, map->size, map->type);
 166
 167         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 168          * hole created by that and it works around various broken drivers that use
 169          * a non-aligned quantity to map the SAREA. --BenH
 170          */
 171         if (map->type == _DRM_SHM)
 172                 map->size = PAGE_ALIGN(map->size);
 173
 174         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 175                 kfree(map);
 176                 return -EINVAL;
 177         }
 178         map->mtrr = -1;
 179         map->handle = NULL;
 180
 181         switch (map->type) {
 182         case _DRM_REGISTERS:
 183         case _DRM_FRAME_BUFFER:
 184 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 185                 if (map->offset + (map->size-1) < map->offset ||
 186                     map->offset < virt_to_phys(high_memory)) {
 187                         kfree(map);
 188                         return -EINVAL;
 189                 }
 190 #endif
 191                 /* Some drivers preinitialize some maps, without the X Server
 192                  * needing to be aware of it.  Therefore, we just return success
 193                  * when the server tries to create a duplicate map.
 194                  */
 195                 list = drm_find_matching_map(dev, map);
 196                 if (list != NULL) {
 197                         if (list->map->size != map->size) {
 198                                 DRM_DEBUG("Matching maps of type %d with "
 199                                           "mismatched sizes, (%ld vs %ld)\n",
 200                                           map->type, map->size,
 201                                           list->map->size);
 202                                 list->map->size = map->size;
 203                         }
 204
 205                         kfree(map);
 206                         *maplist = list;
 207                         return 0;
 208                 }
 209
 210                 if (map->type == _DRM_FRAME_BUFFER ||
 211                     (map->flags & _DRM_WRITE_COMBINING)) {
 212                         map->mtrr =
 213                                 arch_phys_wc_add(map->offset, map->size);
 214                 }
 215                 if (map->type == _DRM_REGISTERS) {
 216                         if (map->flags & _DRM_WRITE_COMBINING)
 217                                 map->handle = ioremap_wc(map->offset,
 218                                                          map->size);
 219                         else
 220                                 map->handle = ioremap(map->offset, map->size);
 221                         if (!map->handle) {
 222                                 kfree(map);
 223                                 return -ENOMEM;
 224                         }
 225                 }
 226
 227                 break;
 228         case _DRM_SHM:
 229                 list = drm_find_matching_map(dev, map);
 230                 if (list != NULL) {
 231                         if(list->map->size != map->size) {
 232                                 DRM_DEBUG("Matching maps of type %d with "
 233                                           "mismatched sizes, (%ld vs %ld)\n",
 234                                           map->type, map->size, list->map->size);
 235                                 list->map->size = map->size;
 236                         }
 237
 238                         kfree(map);
 239                         *maplist = list;
 240                         return 0;
 241                 }
 242                 map->handle = vmalloc_user(map->size);
 243                 DRM_DEBUG("%lu %d %p\n",
 244                           map->size, order_base_2(map->size), map->handle);
 245                 if (!map->handle) {
 246                         kfree(map);
 247                         return -ENOMEM;
 248                 }
 249                 map->offset = (unsigned long)map->handle;
 250                 if (map->flags & _DRM_CONTAINS_LOCK) {
 251                         /* Prevent a 2nd X Server from creating a 2nd lock */
 252                         if (dev->primary->master->lock.hw_lock != NULL) {
 253                                 vfree(map->handle);
 254                                 kfree(map);
 255                                 return -EBUSY;
 256                         }
 257                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 258                 }
 259                 break;
 260         case _DRM_AGP: {
 261                 struct drm_agp_mem *entry;
 262                 int valid = 0;
 263
 264                 if (!drm_core_has_AGP(dev)) {
 265                         kfree(map);
 266                         return -EINVAL;
 267                 }
 268 #ifdef __alpha__
 269                 map->offset += dev->hose->mem_space->start;
 270 #endif
 271                 /* In some cases (i810 driver), user space may have already
 272                  * added the AGP base itself, because dev->agp->base previously
 273                  * only got set during AGP enable.  So, only add the base
 274                  * address if the map's offset isn't already within the
 275                  * aperture.
 276                  */
 277                 if (map->offset < dev->agp->base ||
 278                     map->offset > dev->agp->base +
 279                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 280                         map->offset += dev->agp->base;
 281                 }
 282                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 283
 284                 /* This assumes the DRM is in total control of AGP space.
 285                  * It's not always the case as AGP can be in the control
 286                  * of user space (i.e. i810 driver). So this loop will get
 287                  * skipped and we double check that dev->agp->memory is
 288                  * actually set as well as being invalid before EPERM'ing
 289                  */
 290                 list_for_each_entry(entry, &dev->agp->memory, head) {
 291                         if ((map->offset >= entry->bound) &&
 292                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 293                                 valid = 1;
 294                                 break;
 295                         }
 296                 }
 297                 if (!list_empty(&dev->agp->memory) && !valid) {
 298                         kfree(map);
 299                         return -EPERM;
 300                 }
 301                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 302                           (unsigned long long)map->offset, map->size);
 303
 304                 break;
 305         }
 306         case _DRM_GEM:
 307                 DRM_ERROR("tried to addmap GEM object\n");
 308                 break;
 309         case _DRM_SCATTER_GATHER:
 310                 if (!dev->sg) {
 311                         kfree(map);
 312                         return -EINVAL;
 313                 }
 314                 map->offset += (unsigned long)dev->sg->virtual;
 315                 break;
 316         case _DRM_CONSISTENT:
 317                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 318                  * As we're limiting the address to 2^32-1 (or less),
 319                  * casting it down to 32 bits is no problem, but we
 320                  * need to point to a 64bit variable first. */
 321                 dmah = drm_pci_alloc(dev, map->size, map->size);
 322                 if (!dmah) {
 323                         kfree(map);
 324                         return -ENOMEM;
 325                 }
 326                 map->handle = dmah->vaddr;
 327                 map->offset = (unsigned long)dmah->busaddr;
 328                 kfree(dmah);
 329                 break;
 330         default:
 331                 kfree(map);
 332                 return -EINVAL;
 333         }
 334
 335         list = kzalloc(sizeof(*list), GFP_KERNEL);
 336         if (!list) {
 337                 if (map->type == _DRM_REGISTERS)
 338                         iounmap(map->handle);
 339                 kfree(map);
 340                 return -EINVAL;
 341         }
 342         list->map = map;
 343
 344         mutex_lock(&dev->struct_mutex);
 345         list_add(&list->head, &dev->maplist);
 346
 347         /* Assign a 32-bit handle */
 348         /* We do it here so that dev->struct_mutex protects the increment */
 349         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 350                 map->offset;
 351         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 352                              (map->type == _DRM_SHM));
 353         if (ret) {
 354                 if (map->type == _DRM_REGISTERS)
 355                         iounmap(map->handle);
 356                 kfree(map);
 357                 kfree(list);
 358                 mutex_unlock(&dev->struct_mutex);
 359                 return ret;
 360         }
 361
 362         list->user_token = list->hash.key << PAGE_SHIFT;
 363         mutex_unlock(&dev->struct_mutex);
 364
 365         if (!(map->flags & _DRM_DRIVER))
 366                 list->master = dev->primary->master;
 367         *maplist = list;
 368         return 0;
 369         }
 370
 371 int drm_addmap(struct drm_device * dev, resource_size_t offset,
 372                unsigned int size, enum drm_map_type type,
 373                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 374 {
 375         struct drm_map_list *list;
 376         int rc;
 377
 378         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 379         if (!rc)
 380                 *map_ptr = list->map;
 381         return rc;
 382 }
 383
 384 EXPORT_SYMBOL(drm_addmap);
 385
 386 /**
 387  * Ioctl to specify a range of memory that is available for mapping by a
 388  * non-root process.
 389  *
 390  * \param inode device inode.
 391  * \param file_priv DRM file private.
 392  * \param cmd command.
 393  * \param arg pointer to a drm_map structure.
 394  * \return zero on success or a negative value on error.
 395  *
 396  */
 397 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 398                      struct drm_file *file_priv)
 399 {
 400         struct drm_map *map = data;
 401         struct drm_map_list *maplist;
 402         int err;
 403
 404         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 405                 return -EPERM;
 406
 407         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 408                               map->flags, &maplist);
 409
 410         if (err)
 411                 return err;
 412
 413         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 414         map->handle = (void *)(unsigned long)maplist->user_token;
 415
 416         /*
 417          * It appears that there are no users of this value whatsoever --
 418          * drmAddMap just discards it.  Let's not encourage its use.
 419          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 420          *  it's not a real mtrr index anymore.)
 421          */
 422         map->mtrr = -1;
 423
 424         return 0;
 425 }
 426
 427 /**
 428  * Remove a map private from list and deallocate resources if the mapping
 429  * isn't in use.
 430  *
 431  * Searches the map on drm_device::maplist, removes it from the list, see if
 432  * its being used, and free any associate resource (such as MTRR's) if it's not
 433  * being on use.
 434  *
 435  * \sa drm_addmap
 436  */
 437 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 438 {
 439         struct drm_map_list *r_list = NULL, *list_t;
 440         drm_dma_handle_t dmah;
 441         int found = 0;
 442         struct drm_master *master;
 443
 444         /* Find the list entry for the map and remove it */
 445         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 446                 if (r_list->map == map) {
 447                         master = r_list->master;
 448                         list_del(&r_list->head);
 449                         drm_ht_remove_key(&dev->map_hash,
 450                                           r_list->user_token >> PAGE_SHIFT);
 451                         kfree(r_list);
 452                         found = 1;
 453                         break;
 454                 }
 455         }
 456
 457         if (!found)
 458                 return -EINVAL;
 459
 460         switch (map->type) {
 461         case _DRM_REGISTERS:
 462                 iounmap(map->handle);
 463                 /* FALLTHROUGH */
 464         case _DRM_FRAME_BUFFER:
 465                 arch_phys_wc_del(map->mtrr);
 466                 break;
 467         case _DRM_SHM:
 468                 vfree(map->handle);
 469                 if (master) {
 470                         if (dev->sigdata.lock == master->lock.hw_lock)
 471                                 dev->sigdata.lock = NULL;
 472                         master->lock.hw_lock = NULL;   /* SHM removed */
 473                         master->lock.file_priv = NULL;
 474                         wake_up_interruptible_all(&master->lock.lock_queue);
 475                 }
 476                 break;
 477         case _DRM_AGP:
 478         case _DRM_SCATTER_GATHER:
 479                 break;
 480         case _DRM_CONSISTENT:
 481                 dmah.vaddr = map->handle;
 482                 dmah.busaddr = map->offset;
 483                 dmah.size = map->size;
 484                 __drm_pci_free(dev, &dmah);
 485                 break;
 486         case _DRM_GEM:
 487                 DRM_ERROR("tried to rmmap GEM object\n");
 488                 break;
 489         }
 490         kfree(map);
 491
 492         return 0;
 493 }
 494 EXPORT_SYMBOL(drm_rmmap_locked);
 495
 496 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 497 {
 498         int ret;
 499
 500         mutex_lock(&dev->struct_mutex);
 501         ret = drm_rmmap_locked(dev, map);
 502         mutex_unlock(&dev->struct_mutex);
 503
 504         return ret;
 505 }
 506 EXPORT_SYMBOL(drm_rmmap);
 507
 508 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 509  * the last close of the device, and this is necessary for cleanup when things
 510  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 511  * like a pointless exercise since they're going away anyway.
 512  *
 513  * One use case might be after addmap is allowed for normal users for SHM and
 514  * gets used by drivers that the server doesn't need to care about.  This seems
 515  * unlikely.
 516  *
 517  * \param inode device inode.
 518  * \param file_priv DRM file private.
 519  * \param cmd command.
 520  * \param arg pointer to a struct drm_map structure.
 521  * \return zero on success or a negative value on error.
 522  */
 523 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 524                     struct drm_file *file_priv)
 525 {
 526         struct drm_map *request = data;
 527         struct drm_local_map *map = NULL;
 528         struct drm_map_list *r_list;
 529         int ret;
 530
 531         mutex_lock(&dev->struct_mutex);
 532         list_for_each_entry(r_list, &dev->maplist, head) {
 533                 if (r_list->map &&
 534                     r_list->user_token == (unsigned long)request->handle &&
 535                     r_list->map->flags & _DRM_REMOVABLE) {
 536                         map = r_list->map;
 537                         break;
 538                 }
 539         }
 540
 541         /* List has wrapped around to the head pointer, or its empty we didn't
 542          * find anything.
 543          */
 544         if (list_empty(&dev->maplist) || !map) {
 545                 mutex_unlock(&dev->struct_mutex);
 546                 return -EINVAL;
 547         }
 548
 549         /* Register and framebuffer maps are permanent */
 550         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 551                 mutex_unlock(&dev->struct_mutex);
 552                 return 0;
 553         }
 554
 555         ret = drm_rmmap_locked(dev, map);
 556
 557         mutex_unlock(&dev->struct_mutex);
 558
 559         return ret;
 560 }
 561
 562 /**
 563  * Cleanup after an error on one of the addbufs() functions.
 564  *
 565  * \param dev DRM device.
 566  * \param entry buffer entry where the error occurred.
 567  *
 568  * Frees any pages and buffers associated with the given entry.
 569  */
 570 static void drm_cleanup_buf_error(struct drm_device * dev,
 571                                   struct drm_buf_entry * entry)
 572 {
 573         int i;
 574
 575         if (entry->seg_count) {
 576                 for (i = 0; i < entry->seg_count; i++) {
 577                         if (entry->seglist[i]) {
 578                                 drm_pci_free(dev, entry->seglist[i]);
 579                         }
 580                 }
 581                 kfree(entry->seglist);
 582
 583                 entry->seg_count = 0;
 584         }
 585
 586         if (entry->buf_count) {
 587                 for (i = 0; i < entry->buf_count; i++) {
 588                         kfree(entry->buflist[i].dev_private);
 589                 }
 590                 kfree(entry->buflist);
 591
 592                 entry->buf_count = 0;
 593         }
 594 }
 595
 596 #if __OS_HAS_AGP
 597 /**
 598  * Add AGP buffers for DMA transfers.
 599  *
 600  * \param dev struct drm_device to which the buffers are to be added.
 601  * \param request pointer to a struct drm_buf_desc describing the request.
 602  * \return zero on success or a negative number on failure.
 603  *
 604  * After some sanity checks creates a drm_buf structure for each buffer and
 605  * reallocates the buffer list of the same size order to accommodate the new
 606  * buffers.
 607  */
 608 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 609 {
 610         struct drm_device_dma *dma = dev->dma;
 611         struct drm_buf_entry *entry;
 612         struct drm_agp_mem *agp_entry;
 613         struct drm_buf *buf;
 614         unsigned long offset;
 615         unsigned long agp_offset;
 616         int count;
 617         int order;
 618         int size;
 619         int alignment;
 620         int page_order;
 621         int total;
 622         int byte_count;
 623         int i, valid;
 624         struct drm_buf **temp_buflist;
 625
 626         if (!dma)
 627                 return -EINVAL;
 628
 629         count = request->count;
 630         order = order_base_2(request->size);
 631         size = 1 << order;
 632
 633         alignment = (request->flags & _DRM_PAGE_ALIGN)
 634             ? PAGE_ALIGN(size) : size;
 635         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 636         total = PAGE_SIZE << page_order;
 637
 638         byte_count = 0;
 639         agp_offset = dev->agp->base + request->agp_start;
 640
 641         DRM_DEBUG("count:      %d\n", count);
 642         DRM_DEBUG("order:      %d\n", order);
 643         DRM_DEBUG("size:       %d\n", size);
 644         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 645         DRM_DEBUG("alignment:  %d\n", alignment);
 646         DRM_DEBUG("page_order: %d\n", page_order);
 647         DRM_DEBUG("total:      %d\n", total);
 648
 649         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 650                 return -EINVAL;
 651
 652         /* Make sure buffers are located in AGP memory that we own */
 653         valid = 0;
 654         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 655                 if ((agp_offset >= agp_entry->bound) &&
 656                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 657                         valid = 1;
 658                         break;
 659                 }
 660         }
 661         if (!list_empty(&dev->agp->memory) && !valid) {
 662                 DRM_DEBUG("zone invalid\n");
 663                 return -EINVAL;
 664         }
 665         spin_lock(&dev->count_lock);
 666         if (dev->buf_use) {
 667                 spin_unlock(&dev->count_lock);
 668                 return -EBUSY;
 669         }
 670         atomic_inc(&dev->buf_alloc);
 671         spin_unlock(&dev->count_lock);
 672
 673         mutex_lock(&dev->struct_mutex);
 674         entry = &dma->bufs[order];
 675         if (entry->buf_count) {
 676                 mutex_unlock(&dev->struct_mutex);
 677                 atomic_dec(&dev->buf_alloc);
 678                 return -ENOMEM; /* May only call once for each order */
 679         }
 680
 681         if (count < 0 || count > 4096) {
 682                 mutex_unlock(&dev->struct_mutex);
 683                 atomic_dec(&dev->buf_alloc);
 684                 return -EINVAL;
 685         }
 686
 687         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 688         if (!entry->buflist) {
 689                 mutex_unlock(&dev->struct_mutex);
 690                 atomic_dec(&dev->buf_alloc);
 691                 return -ENOMEM;
 692         }
 693
 694         entry->buf_size = size;
 695         entry->page_order = page_order;
 696
 697         offset = 0;
 698
 699         while (entry->buf_count < count) {
 700                 buf = &entry->buflist[entry->buf_count];
 701                 buf->idx = dma->buf_count + entry->buf_count;
 702                 buf->total = alignment;
 703                 buf->order = order;
 704                 buf->used = 0;
 705
 706                 buf->offset = (dma->byte_count + offset);
 707                 buf->bus_address = agp_offset + offset;
 708                 buf->address = (void *)(agp_offset + offset);
 709                 buf->next = NULL;
 710                 buf->waiting = 0;
 711                 buf->pending = 0;
 712                 buf->file_priv = NULL;
 713
 714                 buf->dev_priv_size = dev->driver->dev_priv_size;
 715                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 716                 if (!buf->dev_private) {
 717                         /* Set count correctly so we free the proper amount. */
 718                         entry->buf_count = count;
 719                         drm_cleanup_buf_error(dev, entry);
 720                         mutex_unlock(&dev->struct_mutex);
 721                         atomic_dec(&dev->buf_alloc);
 722                         return -ENOMEM;
 723                 }
 724
 725                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 726
 727                 offset += alignment;
 728                 entry->buf_count++;
 729                 byte_count += PAGE_SIZE << page_order;
 730         }
 731
 732         DRM_DEBUG("byte_count: %d\n", byte_count);
 733
 734         temp_buflist = krealloc(dma->buflist,
 735                                 (dma->buf_count + entry->buf_count) *
 736                                 sizeof(*dma->buflist), GFP_KERNEL);
 737         if (!temp_buflist) {
 738                 /* Free the entry because it isn't valid */
 739                 drm_cleanup_buf_error(dev, entry);
 740                 mutex_unlock(&dev->struct_mutex);
 741                 atomic_dec(&dev->buf_alloc);
 742                 return -ENOMEM;
 743         }
 744         dma->buflist = temp_buflist;
 745
 746         for (i = 0; i < entry->buf_count; i++) {
 747                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 748         }
 749
 750         dma->buf_count += entry->buf_count;
 751         dma->seg_count += entry->seg_count;
 752         dma->page_count += byte_count >> PAGE_SHIFT;
 753         dma->byte_count += byte_count;
 754
 755         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 756         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 757
 758         mutex_unlock(&dev->struct_mutex);
 759
 760         request->count = entry->buf_count;
 761         request->size = size;
 762
 763         dma->flags = _DRM_DMA_USE_AGP;
 764
 765         atomic_dec(&dev->buf_alloc);
 766         return 0;
 767 }
 768 EXPORT_SYMBOL(drm_addbufs_agp);
 769 #endif                          /* __OS_HAS_AGP */
 770
 771 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 772 {
 773         struct drm_device_dma *dma = dev->dma;
 774         int count;
 775         int order;
 776         int size;
 777         int total;
 778         int page_order;
 779         struct drm_buf_entry *entry;
 780         drm_dma_handle_t *dmah;
 781         struct drm_buf *buf;
 782         int alignment;
 783         unsigned long offset;
 784         int i;
 785         int byte_count;
 786         int page_count;
 787         unsigned long *temp_pagelist;
 788         struct drm_buf **temp_buflist;
 789
 790         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 791                 return -EINVAL;
 792
 793         if (!dma)
 794                 return -EINVAL;
 795
 796         if (!capable(CAP_SYS_ADMIN))
 797                 return -EPERM;
 798
 799         count = request->count;
 800         order = order_base_2(request->size);
 801         size = 1 << order;
 802
 803         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 804                   request->count, request->size, size, order);
 805
 806         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 807                 return -EINVAL;
 808
 809         alignment = (request->flags & _DRM_PAGE_ALIGN)
 810             ? PAGE_ALIGN(size) : size;
 811         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 812         total = PAGE_SIZE << page_order;
 813
 814         spin_lock(&dev->count_lock);
 815         if (dev->buf_use) {
 816                 spin_unlock(&dev->count_lock);
 817                 return -EBUSY;
 818         }
 819         atomic_inc(&dev->buf_alloc);
 820         spin_unlock(&dev->count_lock);
 821
 822         mutex_lock(&dev->struct_mutex);
 823         entry = &dma->bufs[order];
 824         if (entry->buf_count) {
 825                 mutex_unlock(&dev->struct_mutex);
 826                 atomic_dec(&dev->buf_alloc);
 827                 return -ENOMEM; /* May only call once for each order */
 828         }
 829
 830         if (count < 0 || count > 4096) {
 831                 mutex_unlock(&dev->struct_mutex);
 832                 atomic_dec(&dev->buf_alloc);
 833                 return -EINVAL;
 834         }
 835
 836         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 837         if (!entry->buflist) {
 838                 mutex_unlock(&dev->struct_mutex);
 839                 atomic_dec(&dev->buf_alloc);
 840                 return -ENOMEM;
 841         }
 842
 843         entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
 844         if (!entry->seglist) {
 845                 kfree(entry->buflist);
 846                 mutex_unlock(&dev->struct_mutex);
 847                 atomic_dec(&dev->buf_alloc);
 848                 return -ENOMEM;
 849         }
 850
 851         /* Keep the original pagelist until we know all the allocations
 852          * have succeeded
 853          */
 854         temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
 855                                sizeof(*dma->pagelist), GFP_KERNEL);
 856         if (!temp_pagelist) {
 857                 kfree(entry->buflist);
 858                 kfree(entry->seglist);
 859                 mutex_unlock(&dev->struct_mutex);
 860                 atomic_dec(&dev->buf_alloc);
 861                 return -ENOMEM;
 862         }
 863         memcpy(temp_pagelist,
 864                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 865         DRM_DEBUG("pagelist: %d entries\n",
 866                   dma->page_count + (count << page_order));
 867
 868         entry->buf_size = size;
 869         entry->page_order = page_order;
 870         byte_count = 0;
 871         page_count = 0;
 872
 873         while (entry->buf_count < count) {
 874
 875                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 876
 877                 if (!dmah) {
 878                         /* Set count correctly so we free the proper amount. */
 879                         entry->buf_count = count;
 880                         entry->seg_count = count;
 881                         drm_cleanup_buf_error(dev, entry);
 882                         kfree(temp_pagelist);
 883                         mutex_unlock(&dev->struct_mutex);
 884                         atomic_dec(&dev->buf_alloc);
 885                         return -ENOMEM;
 886                 }
 887                 entry->seglist[entry->seg_count++] = dmah;
 888                 for (i = 0; i < (1 << page_order); i++) {
 889                         DRM_DEBUG("page %d @ 0x%08lx\n",
 890                                   dma->page_count + page_count,
 891                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 892                         temp_pagelist[dma->page_count + page_count++]
 893                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 894                 }
 895                 for (offset = 0;
 896                      offset + size <= total && entry->buf_count < count;
 897                      offset += alignment, ++entry->buf_count) {
 898                         buf = &entry->buflist[entry->buf_count];
 899                         buf->idx = dma->buf_count + entry->buf_count;
 900                         buf->total = alignment;
 901                         buf->order = order;
 902                         buf->used = 0;
 903                         buf->offset = (dma->byte_count + byte_count + offset);
 904                         buf->address = (void *)(dmah->vaddr + offset);
 905                         buf->bus_address = dmah->busaddr + offset;
 906                         buf->next = NULL;
 907                         buf->waiting = 0;
 908                         buf->pending = 0;
 909                         buf->file_priv = NULL;
 910
 911                         buf->dev_priv_size = dev->driver->dev_priv_size;
 912                         buf->dev_private = kzalloc(buf->dev_priv_size,
 913                                                 GFP_KERNEL);
 914                         if (!buf->dev_private) {
 915                                 /* Set count correctly so we free the proper amount. */
 916                                 entry->buf_count = count;
 917                                 entry->seg_count = count;
 918                                 drm_cleanup_buf_error(dev, entry);
 919                                 kfree(temp_pagelist);
 920                                 mutex_unlock(&dev->struct_mutex);
 921                                 atomic_dec(&dev->buf_alloc);
 922                                 return -ENOMEM;
 923                         }
 924
 925                         DRM_DEBUG("buffer %d @ %p\n",
 926                                   entry->buf_count, buf->address);
 927                 }
 928                 byte_count += PAGE_SIZE << page_order;
 929         }
 930
 931         temp_buflist = krealloc(dma->buflist,
 932                                 (dma->buf_count + entry->buf_count) *
 933                                 sizeof(*dma->buflist), GFP_KERNEL);
 934         if (!temp_buflist) {
 935                 /* Free the entry because it isn't valid */
 936                 drm_cleanup_buf_error(dev, entry);
 937                 kfree(temp_pagelist);
 938                 mutex_unlock(&dev->struct_mutex);
 939                 atomic_dec(&dev->buf_alloc);
 940                 return -ENOMEM;
 941         }
 942         dma->buflist = temp_buflist;
 943
 944         for (i = 0; i < entry->buf_count; i++) {
 945                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 946         }
 947
 948         /* No allocations failed, so now we can replace the original pagelist
 949          * with the new one.
 950          */
 951         if (dma->page_count) {
 952                 kfree(dma->pagelist);
 953         }
 954         dma->pagelist = temp_pagelist;
 955
 956         dma->buf_count += entry->buf_count;
 957         dma->seg_count += entry->seg_count;
 958         dma->page_count += entry->seg_count << page_order;
 959         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 960
 961         mutex_unlock(&dev->struct_mutex);
 962
 963         request->count = entry->buf_count;
 964         request->size = size;
 965
 966         if (request->flags & _DRM_PCI_BUFFER_RO)
 967                 dma->flags = _DRM_DMA_USE_PCI_RO;
 968
 969         atomic_dec(&dev->buf_alloc);
 970         return 0;
 971
 972 }
 973 EXPORT_SYMBOL(drm_addbufs_pci);
 974
 975 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 976 {
 977         struct drm_device_dma *dma = dev->dma;
 978         struct drm_buf_entry *entry;
 979         struct drm_buf *buf;
 980         unsigned long offset;
 981         unsigned long agp_offset;
 982         int count;
 983         int order;
 984         int size;
 985         int alignment;
 986         int page_order;
 987         int total;
 988         int byte_count;
 989         int i;
 990         struct drm_buf **temp_buflist;
 991
 992         if (!drm_core_check_feature(dev, DRIVER_SG))
 993                 return -EINVAL;
 994
 995         if (!dma)
 996                 return -EINVAL;
 997
 998         if (!capable(CAP_SYS_ADMIN))
 999                 return -EPERM;
1000
1001         count = request->count;
1002         order = order_base_2(request->size);
1003         size = 1 << order;
1004
1005         alignment = (request->flags & _DRM_PAGE_ALIGN)
1006             ? PAGE_ALIGN(size) : size;
1007         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1008         total = PAGE_SIZE << page_order;
1009
1010         byte_count = 0;
1011         agp_offset = request->agp_start;
1012
1013         DRM_DEBUG("count:      %d\n", count);
1014         DRM_DEBUG("order:      %d\n", order);
1015         DRM_DEBUG("size:       %d\n", size);
1016         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1017         DRM_DEBUG("alignment:  %d\n", alignment);
1018         DRM_DEBUG("page_order: %d\n", page_order);
1019         DRM_DEBUG("total:      %d\n", total);
1020
1021         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1022                 return -EINVAL;
1023
1024         spin_lock(&dev->count_lock);
1025         if (dev->buf_use) {
1026                 spin_unlock(&dev->count_lock);
1027                 return -EBUSY;
1028         }
1029         atomic_inc(&dev->buf_alloc);
1030         spin_unlock(&dev->count_lock);
1031
1032         mutex_lock(&dev->struct_mutex);
1033         entry = &dma->bufs[order];
1034         if (entry->buf_count) {
1035                 mutex_unlock(&dev->struct_mutex);
1036                 atomic_dec(&dev->buf_alloc);
1037                 return -ENOMEM; /* May only call once for each order */
1038         }
1039
1040         if (count < 0 || count > 4096) {
1041                 mutex_unlock(&dev->struct_mutex);
1042                 atomic_dec(&dev->buf_alloc);
1043                 return -EINVAL;
1044         }
1045
1046         entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1047                                 GFP_KERNEL);
1048         if (!entry->buflist) {
1049                 mutex_unlock(&dev->struct_mutex);
1050                 atomic_dec(&dev->buf_alloc);
1051                 return -ENOMEM;
1052         }
1053
1054         entry->buf_size = size;
1055         entry->page_order = page_order;
1056
1057         offset = 0;
1058
1059         while (entry->buf_count < count) {
1060                 buf = &entry->buflist[entry->buf_count];
1061                 buf->idx = dma->buf_count + entry->buf_count;
1062                 buf->total = alignment;
1063                 buf->order = order;
1064                 buf->used = 0;
1065
1066                 buf->offset = (dma->byte_count + offset);
1067                 buf->bus_address = agp_offset + offset;
1068                 buf->address = (void *)(agp_offset + offset
1069                                         + (unsigned long)dev->sg->virtual);
1070                 buf->next = NULL;
1071                 buf->waiting = 0;
1072                 buf->pending = 0;
1073                 buf->file_priv = NULL;
1074
1075                 buf->dev_priv_size = dev->driver->dev_priv_size;
1076                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1077                 if (!buf->dev_private) {
1078                         /* Set count correctly so we free the proper amount. */
1079                         entry->buf_count = count;
1080                         drm_cleanup_buf_error(dev, entry);
1081                         mutex_unlock(&dev->struct_mutex);
1082                         atomic_dec(&dev->buf_alloc);
1083                         return -ENOMEM;
1084                 }
1085
1086                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1087
1088                 offset += alignment;
1089                 entry->buf_count++;
1090                 byte_count += PAGE_SIZE << page_order;
1091         }
1092
1093         DRM_DEBUG("byte_count: %d\n", byte_count);
1094
1095         temp_buflist = krealloc(dma->buflist,
1096                                 (dma->buf_count + entry->buf_count) *
1097                                 sizeof(*dma->buflist), GFP_KERNEL);
1098         if (!temp_buflist) {
1099                 /* Free the entry because it isn't valid */
1100                 drm_cleanup_buf_error(dev, entry);
1101                 mutex_unlock(&dev->struct_mutex);
1102                 atomic_dec(&dev->buf_alloc);
1103                 return -ENOMEM;
1104         }
1105         dma->buflist = temp_buflist;
1106
1107         for (i = 0; i < entry->buf_count; i++) {
1108                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1109         }
1110
1111         dma->buf_count += entry->buf_count;
1112         dma->seg_count += entry->seg_count;
1113         dma->page_count += byte_count >> PAGE_SHIFT;
1114         dma->byte_count += byte_count;
1115
1116         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1117         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1118
1119         mutex_unlock(&dev->struct_mutex);
1120
1121         request->count = entry->buf_count;
1122         request->size = size;
1123
1124         dma->flags = _DRM_DMA_USE_SG;
1125
1126         atomic_dec(&dev->buf_alloc);
1127         return 0;
1128 }
1129
1130 /**
1131  * Add buffers for DMA transfers (ioctl).
1132  *
1133  * \param inode device inode.
1134  * \param file_priv DRM file private.
1135  * \param cmd command.
1136  * \param arg pointer to a struct drm_buf_desc request.
1137  * \return zero on success or a negative number on failure.
1138  *
1139  * According with the memory type specified in drm_buf_desc::flags and the
1140  * build options, it dispatches the call either to addbufs_agp(),
1141  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1142  * PCI memory respectively.
1143  */
1144 int drm_addbufs(struct drm_device *dev, void *data,
1145                 struct drm_file *file_priv)
1146 {
1147         struct drm_buf_desc *request = data;
1148         int ret;
1149
1150         if (drm_core_check_feature(dev, DRIVER_MODESET))
1151                 return -EINVAL;
1152
1153         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1154                 return -EINVAL;
1155
1156 #if __OS_HAS_AGP
1157         if (request->flags & _DRM_AGP_BUFFER)
1158                 ret = drm_addbufs_agp(dev, request);
1159         else
1160 #endif
1161         if (request->flags & _DRM_SG_BUFFER)
1162                 ret = drm_addbufs_sg(dev, request);
1163         else if (request->flags & _DRM_FB_BUFFER)
1164                 ret = -EINVAL;
1165         else
1166                 ret = drm_addbufs_pci(dev, request);
1167
1168         return ret;
1169 }
1170
1171 /**
1172  * Get information about the buffer mappings.
1173  *
1174  * This was originally mean for debugging purposes, or by a sophisticated
1175  * client library to determine how best to use the available buffers (e.g.,
1176  * large buffers can be used for image transfer).
1177  *
1178  * \param inode device inode.
1179  * \param file_priv DRM file private.
1180  * \param cmd command.
1181  * \param arg pointer to a drm_buf_info structure.
1182  * \return zero on success or a negative number on failure.
1183  *
1184  * Increments drm_device::buf_use while holding the drm_device::count_lock
1185  * lock, preventing of allocating more buffers after this call. Information
1186  * about each requested buffer is then copied into user space.
1187  */
1188 int drm_infobufs(struct drm_device *dev, void *data,
1189                  struct drm_file *file_priv)
1190 {
1191         struct drm_device_dma *dma = dev->dma;
1192         struct drm_buf_info *request = data;
1193         int i;
1194         int count;
1195
1196         if (drm_core_check_feature(dev, DRIVER_MODESET))
1197                 return -EINVAL;
1198
1199         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1200                 return -EINVAL;
1201
1202         if (!dma)
1203                 return -EINVAL;
1204
1205         spin_lock(&dev->count_lock);
1206         if (atomic_read(&dev->buf_alloc)) {
1207                 spin_unlock(&dev->count_lock);
1208                 return -EBUSY;
1209         }
1210         ++dev->buf_use;         /* Can't allocate more after this call */
1211         spin_unlock(&dev->count_lock);
1212
1213         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1214                 if (dma->bufs[i].buf_count)
1215                         ++count;
1216         }
1217
1218         DRM_DEBUG("count = %d\n", count);
1219
1220         if (request->count >= count) {
1221                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1222                         if (dma->bufs[i].buf_count) {
1223                                 struct drm_buf_desc __user *to =
1224                                     &request->list[count];
1225                                 struct drm_buf_entry *from = &dma->bufs[i];
1226                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1227                                 if (copy_to_user(&to->count,
1228                                                  &from->buf_count,
1229                                                  sizeof(from->buf_count)) ||
1230                                     copy_to_user(&to->size,
1231                                                  &from->buf_size,
1232                                                  sizeof(from->buf_size)) ||
1233                                     copy_to_user(&to->low_mark,
1234                                                  &list->low_mark,
1235                                                  sizeof(list->low_mark)) ||
1236                                     copy_to_user(&to->high_mark,
1237                                                  &list->high_mark,
1238                                                  sizeof(list->high_mark)))
1239                                         return -EFAULT;
1240
1241                                 DRM_DEBUG("%d %d %d %d %d\n",
1242                                           i,
1243                                           dma->bufs[i].buf_count,
1244                                           dma->bufs[i].buf_size,
1245                                           dma->bufs[i].freelist.low_mark,
1246                                           dma->bufs[i].freelist.high_mark);
1247                                 ++count;
1248                         }
1249                 }
1250         }
1251         request->count = count;
1252
1253         return 0;
1254 }
1255
1256 /**
1257  * Specifies a low and high water mark for buffer allocation
1258  *
1259  * \param inode device inode.
1260  * \param file_priv DRM file private.
1261  * \param cmd command.
1262  * \param arg a pointer to a drm_buf_desc structure.
1263  * \return zero on success or a negative number on failure.
1264  *
1265  * Verifies that the size order is bounded between the admissible orders and
1266  * updates the respective drm_device_dma::bufs entry low and high water mark.
1267  *
1268  * \note This ioctl is deprecated and mostly never used.
1269  */
1270 int drm_markbufs(struct drm_device *dev, void *data,
1271                  struct drm_file *file_priv)
1272 {
1273         struct drm_device_dma *dma = dev->dma;
1274         struct drm_buf_desc *request = data;
1275         int order;
1276         struct drm_buf_entry *entry;
1277
1278         if (drm_core_check_feature(dev, DRIVER_MODESET))
1279                 return -EINVAL;
1280
1281         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1282                 return -EINVAL;
1283
1284         if (!dma)
1285                 return -EINVAL;
1286
1287         DRM_DEBUG("%d, %d, %d\n",
1288                   request->size, request->low_mark, request->high_mark);
1289         order = order_base_2(request->size);
1290         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1291                 return -EINVAL;
1292         entry = &dma->bufs[order];
1293
1294         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1295                 return -EINVAL;
1296         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1297                 return -EINVAL;
1298
1299         entry->freelist.low_mark = request->low_mark;
1300         entry->freelist.high_mark = request->high_mark;
1301
1302         return 0;
1303 }
1304
1305 /**
1306  * Unreserve the buffers in list, previously reserved using drmDMA.
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_free structure.
1312  * \return zero on success or a negative number on failure.
1313  *
1314  * Calls free_buffer() for each used buffer.
1315  * This function is primarily used for debugging.
1316  */
1317 int drm_freebufs(struct drm_device *dev, void *data,
1318                  struct drm_file *file_priv)
1319 {
1320         struct drm_device_dma *dma = dev->dma;
1321         struct drm_buf_free *request = data;
1322         int i;
1323         int idx;
1324         struct drm_buf *buf;
1325
1326         if (drm_core_check_feature(dev, DRIVER_MODESET))
1327                 return -EINVAL;
1328
1329         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1330                 return -EINVAL;
1331
1332         if (!dma)
1333                 return -EINVAL;
1334
1335         DRM_DEBUG("%d\n", request->count);
1336         for (i = 0; i < request->count; i++) {
1337                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1338                         return -EFAULT;
1339                 if (idx < 0 || idx >= dma->buf_count) {
1340                         DRM_ERROR("Index %d (of %d max)\n",
1341                                   idx, dma->buf_count - 1);
1342                         return -EINVAL;
1343                 }
1344                 buf = dma->buflist[idx];
1345                 if (buf->file_priv != file_priv) {
1346                         DRM_ERROR("Process %d freeing buffer not owned\n",
1347                                   task_pid_nr(current));
1348                         return -EINVAL;
1349                 }
1350                 drm_free_buffer(dev, buf);
1351         }
1352
1353         return 0;
1354 }
1355
1356 /**
1357  * Maps all of the DMA buffers into client-virtual space (ioctl).
1358  *
1359  * \param inode device inode.
1360  * \param file_priv DRM file private.
1361  * \param cmd command.
1362  * \param arg pointer to a drm_buf_map structure.
1363  * \return zero on success or a negative number on failure.
1364  *
1365  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1366  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1367  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1368  * drm_mmap_dma().
1369  */
1370 int drm_mapbufs(struct drm_device *dev, void *data,
1371                 struct drm_file *file_priv)
1372 {
1373         struct drm_device_dma *dma = dev->dma;
1374         int retcode = 0;
1375         const int zero = 0;
1376         unsigned long virtual;
1377         unsigned long address;
1378         struct drm_buf_map *request = data;
1379         int i;
1380
1381         if (drm_core_check_feature(dev, DRIVER_MODESET))
1382                 return -EINVAL;
1383
1384         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1385                 return -EINVAL;
1386
1387         if (!dma)
1388                 return -EINVAL;
1389
1390         spin_lock(&dev->count_lock);
1391         if (atomic_read(&dev->buf_alloc)) {
1392                 spin_unlock(&dev->count_lock);
1393                 return -EBUSY;
1394         }
1395         dev->buf_use++;         /* Can't allocate more after this call */
1396         spin_unlock(&dev->count_lock);
1397
1398         if (request->count >= dma->buf_count) {
1399                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1400                     || (drm_core_check_feature(dev, DRIVER_SG)
1401                         && (dma->flags & _DRM_DMA_USE_SG))) {
1402                         struct drm_local_map *map = dev->agp_buffer_map;
1403                         unsigned long token = dev->agp_buffer_token;
1404
1405                         if (!map) {
1406                                 retcode = -EINVAL;
1407                                 goto done;
1408                         }
1409                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1410                                           PROT_READ | PROT_WRITE,
1411                                           MAP_SHARED,
1412                                           token);
1413                 } else {
1414                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1415                                           PROT_READ | PROT_WRITE,
1416                                           MAP_SHARED, 0);
1417                 }
1418                 if (virtual > -1024UL) {
1419                         /* Real error */
1420                         retcode = (signed long)virtual;
1421                         goto done;
1422                 }
1423                 request->virtual = (void __user *)virtual;
1424
1425                 for (i = 0; i < dma->buf_count; i++) {
1426                         if (copy_to_user(&request->list[i].idx,
1427                                          &dma->buflist[i]->idx,
1428                                          sizeof(request->list[0].idx))) {
1429                                 retcode = -EFAULT;
1430                                 goto done;
1431                         }
1432                         if (copy_to_user(&request->list[i].total,
1433                                          &dma->buflist[i]->total,
1434                                          sizeof(request->list[0].total))) {
1435                                 retcode = -EFAULT;
1436                                 goto done;
1437                         }
1438                         if (copy_to_user(&request->list[i].used,
1439                                          &zero, sizeof(zero))) {
1440                                 retcode = -EFAULT;
1441                                 goto done;
1442                         }
1443                         address = virtual + dma->buflist[i]->offset;    /* *** */
1444                         if (copy_to_user(&request->list[i].address,
1445                                          &address, sizeof(address))) {
1446                                 retcode = -EFAULT;
1447                                 goto done;
1448                         }
1449                 }
1450         }
1451       done:
1452         request->count = dma->buf_count;
1453         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1454
1455         return retcode;
1456 }
1457
1458 int drm_dma_ioctl(struct drm_device *dev, void *data,
1459                   struct drm_file *file_priv)
1460 {
1461         if (drm_core_check_feature(dev, DRIVER_MODESET))
1462                 return -EINVAL;
1463
1464         if (dev->driver->dma_ioctl)
1465                 return dev->driver->dma_ioctl(dev, data, file_priv);
1466         else
1467                 return -EINVAL;
1468 }
1469
1470 struct drm_local_map *drm_getsarea(struct drm_device *dev)
1471 {
1472         struct drm_map_list *entry;
1473
1474         list_for_each_entry(entry, &dev->maplist, head) {
1475                 if (entry->map && entry->map->type == _DRM_SHM &&
1476                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1477                         return entry->map;
1478                 }
1479         }
1480         return NULL;
1481 }
1482 EXPORT_SYMBOL(drm_getsarea);