drivers/gpu/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 <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 (!dev->agp) {
 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_SCATTER_GATHER:
 307                 if (!dev->sg) {
 308                         kfree(map);
 309                         return -EINVAL;
 310                 }
 311                 map->offset += (unsigned long)dev->sg->virtual;
 312                 break;
 313         case _DRM_CONSISTENT:
 314                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 315                  * As we're limiting the address to 2^32-1 (or less),
 316                  * casting it down to 32 bits is no problem, but we
 317                  * need to point to a 64bit variable first. */
 318                 dmah = drm_pci_alloc(dev, map->size, map->size);
 319                 if (!dmah) {
 320                         kfree(map);
 321                         return -ENOMEM;
 322                 }
 323                 map->handle = dmah->vaddr;
 324                 map->offset = (unsigned long)dmah->busaddr;
 325                 kfree(dmah);
 326                 break;
 327         default:
 328                 kfree(map);
 329                 return -EINVAL;
 330         }
 331
 332         list = kzalloc(sizeof(*list), GFP_KERNEL);
 333         if (!list) {
 334                 if (map->type == _DRM_REGISTERS)
 335                         iounmap(map->handle);
 336                 kfree(map);
 337                 return -EINVAL;
 338         }
 339         list->map = map;
 340
 341         mutex_lock(&dev->struct_mutex);
 342         list_add(&list->head, &dev->maplist);
 343
 344         /* Assign a 32-bit handle */
 345         /* We do it here so that dev->struct_mutex protects the increment */
 346         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 347                 map->offset;
 348         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 349                              (map->type == _DRM_SHM));
 350         if (ret) {
 351                 if (map->type == _DRM_REGISTERS)
 352                         iounmap(map->handle);
 353                 kfree(map);
 354                 kfree(list);
 355                 mutex_unlock(&dev->struct_mutex);
 356                 return ret;
 357         }
 358
 359         list->user_token = list->hash.key << PAGE_SHIFT;
 360         mutex_unlock(&dev->struct_mutex);
 361
 362         if (!(map->flags & _DRM_DRIVER))
 363                 list->master = dev->primary->master;
 364         *maplist = list;
 365         return 0;
 366 }
 367
 368 int drm_addmap(struct drm_device * dev, resource_size_t offset,
 369                unsigned int size, enum drm_map_type type,
 370                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 371 {
 372         struct drm_map_list *list;
 373         int rc;
 374
 375         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 376         if (!rc)
 377                 *map_ptr = list->map;
 378         return rc;
 379 }
 380
 381 EXPORT_SYMBOL(drm_addmap);
 382
 383 /**
 384  * Ioctl to specify a range of memory that is available for mapping by a
 385  * non-root process.
 386  *
 387  * \param inode device inode.
 388  * \param file_priv DRM file private.
 389  * \param cmd command.
 390  * \param arg pointer to a drm_map structure.
 391  * \return zero on success or a negative value on error.
 392  *
 393  */
 394 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 395                      struct drm_file *file_priv)
 396 {
 397         struct drm_map *map = data;
 398         struct drm_map_list *maplist;
 399         int err;
 400
 401         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 402                 return -EPERM;
 403
 404         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 405                               map->flags, &maplist);
 406
 407         if (err)
 408                 return err;
 409
 410         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 411         map->handle = (void *)(unsigned long)maplist->user_token;
 412
 413         /*
 414          * It appears that there are no users of this value whatsoever --
 415          * drmAddMap just discards it.  Let's not encourage its use.
 416          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 417          *  it's not a real mtrr index anymore.)
 418          */
 419         map->mtrr = -1;
 420
 421         return 0;
 422 }
 423
 424 /**
 425  * Remove a map private from list and deallocate resources if the mapping
 426  * isn't in use.
 427  *
 428  * Searches the map on drm_device::maplist, removes it from the list, see if
 429  * its being used, and free any associate resource (such as MTRR's) if it's not
 430  * being on use.
 431  *
 432  * \sa drm_addmap
 433  */
 434 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 435 {
 436         struct drm_map_list *r_list = NULL, *list_t;
 437         drm_dma_handle_t dmah;
 438         int found = 0;
 439         struct drm_master *master;
 440
 441         /* Find the list entry for the map and remove it */
 442         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 443                 if (r_list->map == map) {
 444                         master = r_list->master;
 445                         list_del(&r_list->head);
 446                         drm_ht_remove_key(&dev->map_hash,
 447                                           r_list->user_token >> PAGE_SHIFT);
 448                         kfree(r_list);
 449                         found = 1;
 450                         break;
 451                 }
 452         }
 453
 454         if (!found)
 455                 return -EINVAL;
 456
 457         switch (map->type) {
 458         case _DRM_REGISTERS:
 459                 iounmap(map->handle);
 460                 /* FALLTHROUGH */
 461         case _DRM_FRAME_BUFFER:
 462                 arch_phys_wc_del(map->mtrr);
 463                 break;
 464         case _DRM_SHM:
 465                 vfree(map->handle);
 466                 if (master) {
 467                         if (dev->sigdata.lock == master->lock.hw_lock)
 468                                 dev->sigdata.lock = NULL;
 469                         master->lock.hw_lock = NULL;   /* SHM removed */
 470                         master->lock.file_priv = NULL;
 471                         wake_up_interruptible_all(&master->lock.lock_queue);
 472                 }
 473                 break;
 474         case _DRM_AGP:
 475         case _DRM_SCATTER_GATHER:
 476                 break;
 477         case _DRM_CONSISTENT:
 478                 dmah.vaddr = map->handle;
 479                 dmah.busaddr = map->offset;
 480                 dmah.size = map->size;
 481                 __drm_pci_free(dev, &dmah);
 482                 break;
 483         }
 484         kfree(map);
 485
 486         return 0;
 487 }
 488 EXPORT_SYMBOL(drm_rmmap_locked);
 489
 490 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 491 {
 492         int ret;
 493
 494         mutex_lock(&dev->struct_mutex);
 495         ret = drm_rmmap_locked(dev, map);
 496         mutex_unlock(&dev->struct_mutex);
 497
 498         return ret;
 499 }
 500 EXPORT_SYMBOL(drm_rmmap);
 501
 502 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 503  * the last close of the device, and this is necessary for cleanup when things
 504  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 505  * like a pointless exercise since they're going away anyway.
 506  *
 507  * One use case might be after addmap is allowed for normal users for SHM and
 508  * gets used by drivers that the server doesn't need to care about.  This seems
 509  * unlikely.
 510  *
 511  * \param inode device inode.
 512  * \param file_priv DRM file private.
 513  * \param cmd command.
 514  * \param arg pointer to a struct drm_map structure.
 515  * \return zero on success or a negative value on error.
 516  */
 517 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 518                     struct drm_file *file_priv)
 519 {
 520         struct drm_map *request = data;
 521         struct drm_local_map *map = NULL;
 522         struct drm_map_list *r_list;
 523         int ret;
 524
 525         mutex_lock(&dev->struct_mutex);
 526         list_for_each_entry(r_list, &dev->maplist, head) {
 527                 if (r_list->map &&
 528                     r_list->user_token == (unsigned long)request->handle &&
 529                     r_list->map->flags & _DRM_REMOVABLE) {
 530                         map = r_list->map;
 531                         break;
 532                 }
 533         }
 534
 535         /* List has wrapped around to the head pointer, or its empty we didn't
 536          * find anything.
 537          */
 538         if (list_empty(&dev->maplist) || !map) {
 539                 mutex_unlock(&dev->struct_mutex);
 540                 return -EINVAL;
 541         }
 542
 543         /* Register and framebuffer maps are permanent */
 544         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 545                 mutex_unlock(&dev->struct_mutex);
 546                 return 0;
 547         }
 548
 549         ret = drm_rmmap_locked(dev, map);
 550
 551         mutex_unlock(&dev->struct_mutex);
 552
 553         return ret;
 554 }
 555
 556 /**
 557  * Cleanup after an error on one of the addbufs() functions.
 558  *
 559  * \param dev DRM device.
 560  * \param entry buffer entry where the error occurred.
 561  *
 562  * Frees any pages and buffers associated with the given entry.
 563  */
 564 static void drm_cleanup_buf_error(struct drm_device * dev,
 565                                   struct drm_buf_entry * entry)
 566 {
 567         int i;
 568
 569         if (entry->seg_count) {
 570                 for (i = 0; i < entry->seg_count; i++) {
 571                         if (entry->seglist[i]) {
 572                                 drm_pci_free(dev, entry->seglist[i]);
 573                         }
 574                 }
 575                 kfree(entry->seglist);
 576
 577                 entry->seg_count = 0;
 578         }
 579
 580         if (entry->buf_count) {
 581                 for (i = 0; i < entry->buf_count; i++) {
 582                         kfree(entry->buflist[i].dev_private);
 583                 }
 584                 kfree(entry->buflist);
 585
 586                 entry->buf_count = 0;
 587         }
 588 }
 589
 590 #if __OS_HAS_AGP
 591 /**
 592  * Add AGP buffers for DMA transfers.
 593  *
 594  * \param dev struct drm_device to which the buffers are to be added.
 595  * \param request pointer to a struct drm_buf_desc describing the request.
 596  * \return zero on success or a negative number on failure.
 597  *
 598  * After some sanity checks creates a drm_buf structure for each buffer and
 599  * reallocates the buffer list of the same size order to accommodate the new
 600  * buffers.
 601  */
 602 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 603 {
 604         struct drm_device_dma *dma = dev->dma;
 605         struct drm_buf_entry *entry;
 606         struct drm_agp_mem *agp_entry;
 607         struct drm_buf *buf;
 608         unsigned long offset;
 609         unsigned long agp_offset;
 610         int count;
 611         int order;
 612         int size;
 613         int alignment;
 614         int page_order;
 615         int total;
 616         int byte_count;
 617         int i, valid;
 618         struct drm_buf **temp_buflist;
 619
 620         if (!dma)
 621                 return -EINVAL;
 622
 623         count = request->count;
 624         order = order_base_2(request->size);
 625         size = 1 << order;
 626
 627         alignment = (request->flags & _DRM_PAGE_ALIGN)
 628             ? PAGE_ALIGN(size) : size;
 629         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 630         total = PAGE_SIZE << page_order;
 631
 632         byte_count = 0;
 633         agp_offset = dev->agp->base + request->agp_start;
 634
 635         DRM_DEBUG("count:      %d\n", count);
 636         DRM_DEBUG("order:      %d\n", order);
 637         DRM_DEBUG("size:       %d\n", size);
 638         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 639         DRM_DEBUG("alignment:  %d\n", alignment);
 640         DRM_DEBUG("page_order: %d\n", page_order);
 641         DRM_DEBUG("total:      %d\n", total);
 642
 643         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 644                 return -EINVAL;
 645
 646         /* Make sure buffers are located in AGP memory that we own */
 647         valid = 0;
 648         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 649                 if ((agp_offset >= agp_entry->bound) &&
 650                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 651                         valid = 1;
 652                         break;
 653                 }
 654         }
 655         if (!list_empty(&dev->agp->memory) && !valid) {
 656                 DRM_DEBUG("zone invalid\n");
 657                 return -EINVAL;
 658         }
 659         spin_lock(&dev->buf_lock);
 660         if (dev->buf_use) {
 661                 spin_unlock(&dev->buf_lock);
 662                 return -EBUSY;
 663         }
 664         atomic_inc(&dev->buf_alloc);
 665         spin_unlock(&dev->buf_lock);
 666
 667         mutex_lock(&dev->struct_mutex);
 668         entry = &dma->bufs[order];
 669         if (entry->buf_count) {
 670                 mutex_unlock(&dev->struct_mutex);
 671                 atomic_dec(&dev->buf_alloc);
 672                 return -ENOMEM; /* May only call once for each order */
 673         }
 674
 675         if (count < 0 || count > 4096) {
 676                 mutex_unlock(&dev->struct_mutex);
 677                 atomic_dec(&dev->buf_alloc);
 678                 return -EINVAL;
 679         }
 680
 681         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 682         if (!entry->buflist) {
 683                 mutex_unlock(&dev->struct_mutex);
 684                 atomic_dec(&dev->buf_alloc);
 685                 return -ENOMEM;
 686         }
 687
 688         entry->buf_size = size;
 689         entry->page_order = page_order;
 690
 691         offset = 0;
 692
 693         while (entry->buf_count < count) {
 694                 buf = &entry->buflist[entry->buf_count];
 695                 buf->idx = dma->buf_count + entry->buf_count;
 696                 buf->total = alignment;
 697                 buf->order = order;
 698                 buf->used = 0;
 699
 700                 buf->offset = (dma->byte_count + offset);
 701                 buf->bus_address = agp_offset + offset;
 702                 buf->address = (void *)(agp_offset + offset);
 703                 buf->next = NULL;
 704                 buf->waiting = 0;
 705                 buf->pending = 0;
 706                 buf->file_priv = NULL;
 707
 708                 buf->dev_priv_size = dev->driver->dev_priv_size;
 709                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 710                 if (!buf->dev_private) {
 711                         /* Set count correctly so we free the proper amount. */
 712                         entry->buf_count = count;
 713                         drm_cleanup_buf_error(dev, entry);
 714                         mutex_unlock(&dev->struct_mutex);
 715                         atomic_dec(&dev->buf_alloc);
 716                         return -ENOMEM;
 717                 }
 718
 719                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 720
 721                 offset += alignment;
 722                 entry->buf_count++;
 723                 byte_count += PAGE_SIZE << page_order;
 724         }
 725
 726         DRM_DEBUG("byte_count: %d\n", byte_count);
 727
 728         temp_buflist = krealloc(dma->buflist,
 729                                 (dma->buf_count + entry->buf_count) *
 730                                 sizeof(*dma->buflist), GFP_KERNEL);
 731         if (!temp_buflist) {
 732                 /* Free the entry because it isn't valid */
 733                 drm_cleanup_buf_error(dev, entry);
 734                 mutex_unlock(&dev->struct_mutex);
 735                 atomic_dec(&dev->buf_alloc);
 736                 return -ENOMEM;
 737         }
 738         dma->buflist = temp_buflist;
 739
 740         for (i = 0; i < entry->buf_count; i++) {
 741                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 742         }
 743
 744         dma->buf_count += entry->buf_count;
 745         dma->seg_count += entry->seg_count;
 746         dma->page_count += byte_count >> PAGE_SHIFT;
 747         dma->byte_count += byte_count;
 748
 749         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 750         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 751
 752         mutex_unlock(&dev->struct_mutex);
 753
 754         request->count = entry->buf_count;
 755         request->size = size;
 756
 757         dma->flags = _DRM_DMA_USE_AGP;
 758
 759         atomic_dec(&dev->buf_alloc);
 760         return 0;
 761 }
 762 EXPORT_SYMBOL(drm_addbufs_agp);
 763 #endif                          /* __OS_HAS_AGP */
 764
 765 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 766 {
 767         struct drm_device_dma *dma = dev->dma;
 768         int count;
 769         int order;
 770         int size;
 771         int total;
 772         int page_order;
 773         struct drm_buf_entry *entry;
 774         drm_dma_handle_t *dmah;
 775         struct drm_buf *buf;
 776         int alignment;
 777         unsigned long offset;
 778         int i;
 779         int byte_count;
 780         int page_count;
 781         unsigned long *temp_pagelist;
 782         struct drm_buf **temp_buflist;
 783
 784         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 785                 return -EINVAL;
 786
 787         if (!dma)
 788                 return -EINVAL;
 789
 790         if (!capable(CAP_SYS_ADMIN))
 791                 return -EPERM;
 792
 793         count = request->count;
 794         order = order_base_2(request->size);
 795         size = 1 << order;
 796
 797         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 798                   request->count, request->size, size, order);
 799
 800         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 801                 return -EINVAL;
 802
 803         alignment = (request->flags & _DRM_PAGE_ALIGN)
 804             ? PAGE_ALIGN(size) : size;
 805         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 806         total = PAGE_SIZE << page_order;
 807
 808         spin_lock(&dev->buf_lock);
 809         if (dev->buf_use) {
 810                 spin_unlock(&dev->buf_lock);
 811                 return -EBUSY;
 812         }
 813         atomic_inc(&dev->buf_alloc);
 814         spin_unlock(&dev->buf_lock);
 815
 816         mutex_lock(&dev->struct_mutex);
 817         entry = &dma->bufs[order];
 818         if (entry->buf_count) {
 819                 mutex_unlock(&dev->struct_mutex);
 820                 atomic_dec(&dev->buf_alloc);
 821                 return -ENOMEM; /* May only call once for each order */
 822         }
 823
 824         if (count < 0 || count > 4096) {
 825                 mutex_unlock(&dev->struct_mutex);
 826                 atomic_dec(&dev->buf_alloc);
 827                 return -EINVAL;
 828         }
 829
 830         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 831         if (!entry->buflist) {
 832                 mutex_unlock(&dev->struct_mutex);
 833                 atomic_dec(&dev->buf_alloc);
 834                 return -ENOMEM;
 835         }
 836
 837         entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
 838         if (!entry->seglist) {
 839                 kfree(entry->buflist);
 840                 mutex_unlock(&dev->struct_mutex);
 841                 atomic_dec(&dev->buf_alloc);
 842                 return -ENOMEM;
 843         }
 844
 845         /* Keep the original pagelist until we know all the allocations
 846          * have succeeded
 847          */
 848         temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
 849                                sizeof(*dma->pagelist), GFP_KERNEL);
 850         if (!temp_pagelist) {
 851                 kfree(entry->buflist);
 852                 kfree(entry->seglist);
 853                 mutex_unlock(&dev->struct_mutex);
 854                 atomic_dec(&dev->buf_alloc);
 855                 return -ENOMEM;
 856         }
 857         memcpy(temp_pagelist,
 858                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 859         DRM_DEBUG("pagelist: %d entries\n",
 860                   dma->page_count + (count << page_order));
 861
 862         entry->buf_size = size;
 863         entry->page_order = page_order;
 864         byte_count = 0;
 865         page_count = 0;
 866
 867         while (entry->buf_count < count) {
 868
 869                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 870
 871                 if (!dmah) {
 872                         /* Set count correctly so we free the proper amount. */
 873                         entry->buf_count = count;
 874                         entry->seg_count = count;
 875                         drm_cleanup_buf_error(dev, entry);
 876                         kfree(temp_pagelist);
 877                         mutex_unlock(&dev->struct_mutex);
 878                         atomic_dec(&dev->buf_alloc);
 879                         return -ENOMEM;
 880                 }
 881                 entry->seglist[entry->seg_count++] = dmah;
 882                 for (i = 0; i < (1 << page_order); i++) {
 883                         DRM_DEBUG("page %d @ 0x%08lx\n",
 884                                   dma->page_count + page_count,
 885                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 886                         temp_pagelist[dma->page_count + page_count++]
 887                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 888                 }
 889                 for (offset = 0;
 890                      offset + size <= total && entry->buf_count < count;
 891                      offset += alignment, ++entry->buf_count) {
 892                         buf = &entry->buflist[entry->buf_count];
 893                         buf->idx = dma->buf_count + entry->buf_count;
 894                         buf->total = alignment;
 895                         buf->order = order;
 896                         buf->used = 0;
 897                         buf->offset = (dma->byte_count + byte_count + offset);
 898                         buf->address = (void *)(dmah->vaddr + offset);
 899                         buf->bus_address = dmah->busaddr + offset;
 900                         buf->next = NULL;
 901                         buf->waiting = 0;
 902                         buf->pending = 0;
 903                         buf->file_priv = NULL;
 904
 905                         buf->dev_priv_size = dev->driver->dev_priv_size;
 906                         buf->dev_private = kzalloc(buf->dev_priv_size,
 907                                                 GFP_KERNEL);
 908                         if (!buf->dev_private) {
 909                                 /* Set count correctly so we free the proper amount. */
 910                                 entry->buf_count = count;
 911                                 entry->seg_count = count;
 912                                 drm_cleanup_buf_error(dev, entry);
 913                                 kfree(temp_pagelist);
 914                                 mutex_unlock(&dev->struct_mutex);
 915                                 atomic_dec(&dev->buf_alloc);
 916                                 return -ENOMEM;
 917                         }
 918
 919                         DRM_DEBUG("buffer %d @ %p\n",
 920                                   entry->buf_count, buf->address);
 921                 }
 922                 byte_count += PAGE_SIZE << page_order;
 923         }
 924
 925         temp_buflist = krealloc(dma->buflist,
 926                                 (dma->buf_count + entry->buf_count) *
 927                                 sizeof(*dma->buflist), GFP_KERNEL);
 928         if (!temp_buflist) {
 929                 /* Free the entry because it isn't valid */
 930                 drm_cleanup_buf_error(dev, entry);
 931                 kfree(temp_pagelist);
 932                 mutex_unlock(&dev->struct_mutex);
 933                 atomic_dec(&dev->buf_alloc);
 934                 return -ENOMEM;
 935         }
 936         dma->buflist = temp_buflist;
 937
 938         for (i = 0; i < entry->buf_count; i++) {
 939                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 940         }
 941
 942         /* No allocations failed, so now we can replace the original pagelist
 943          * with the new one.
 944          */
 945         if (dma->page_count) {
 946                 kfree(dma->pagelist);
 947         }
 948         dma->pagelist = temp_pagelist;
 949
 950         dma->buf_count += entry->buf_count;
 951         dma->seg_count += entry->seg_count;
 952         dma->page_count += entry->seg_count << page_order;
 953         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 954
 955         mutex_unlock(&dev->struct_mutex);
 956
 957         request->count = entry->buf_count;
 958         request->size = size;
 959
 960         if (request->flags & _DRM_PCI_BUFFER_RO)
 961                 dma->flags = _DRM_DMA_USE_PCI_RO;
 962
 963         atomic_dec(&dev->buf_alloc);
 964         return 0;
 965
 966 }
 967 EXPORT_SYMBOL(drm_addbufs_pci);
 968
 969 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 970 {
 971         struct drm_device_dma *dma = dev->dma;
 972         struct drm_buf_entry *entry;
 973         struct drm_buf *buf;
 974         unsigned long offset;
 975         unsigned long agp_offset;
 976         int count;
 977         int order;
 978         int size;
 979         int alignment;
 980         int page_order;
 981         int total;
 982         int byte_count;
 983         int i;
 984         struct drm_buf **temp_buflist;
 985
 986         if (!drm_core_check_feature(dev, DRIVER_SG))
 987                 return -EINVAL;
 988
 989         if (!dma)
 990                 return -EINVAL;
 991
 992         if (!capable(CAP_SYS_ADMIN))
 993                 return -EPERM;
 994
 995         count = request->count;
 996         order = order_base_2(request->size);
 997         size = 1 << order;
 998
 999         alignment = (request->flags & _DRM_PAGE_ALIGN)
1000             ? PAGE_ALIGN(size) : size;
1001         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1002         total = PAGE_SIZE << page_order;
1003
1004         byte_count = 0;
1005         agp_offset = request->agp_start;
1006
1007         DRM_DEBUG("count:      %d\n", count);
1008         DRM_DEBUG("order:      %d\n", order);
1009         DRM_DEBUG("size:       %d\n", size);
1010         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1011         DRM_DEBUG("alignment:  %d\n", alignment);
1012         DRM_DEBUG("page_order: %d\n", page_order);
1013         DRM_DEBUG("total:      %d\n", total);
1014
1015         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1016                 return -EINVAL;
1017
1018         spin_lock(&dev->buf_lock);
1019         if (dev->buf_use) {
1020                 spin_unlock(&dev->buf_lock);
1021                 return -EBUSY;
1022         }
1023         atomic_inc(&dev->buf_alloc);
1024         spin_unlock(&dev->buf_lock);
1025
1026         mutex_lock(&dev->struct_mutex);
1027         entry = &dma->bufs[order];
1028         if (entry->buf_count) {
1029                 mutex_unlock(&dev->struct_mutex);
1030                 atomic_dec(&dev->buf_alloc);
1031                 return -ENOMEM; /* May only call once for each order */
1032         }
1033
1034         if (count < 0 || count > 4096) {
1035                 mutex_unlock(&dev->struct_mutex);
1036                 atomic_dec(&dev->buf_alloc);
1037                 return -EINVAL;
1038         }
1039
1040         entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1041                                 GFP_KERNEL);
1042         if (!entry->buflist) {
1043                 mutex_unlock(&dev->struct_mutex);
1044                 atomic_dec(&dev->buf_alloc);
1045                 return -ENOMEM;
1046         }
1047
1048         entry->buf_size = size;
1049         entry->page_order = page_order;
1050
1051         offset = 0;
1052
1053         while (entry->buf_count < count) {
1054                 buf = &entry->buflist[entry->buf_count];
1055                 buf->idx = dma->buf_count + entry->buf_count;
1056                 buf->total = alignment;
1057                 buf->order = order;
1058                 buf->used = 0;
1059
1060                 buf->offset = (dma->byte_count + offset);
1061                 buf->bus_address = agp_offset + offset;
1062                 buf->address = (void *)(agp_offset + offset
1063                                         + (unsigned long)dev->sg->virtual);
1064                 buf->next = NULL;
1065                 buf->waiting = 0;
1066                 buf->pending = 0;
1067                 buf->file_priv = NULL;
1068
1069                 buf->dev_priv_size = dev->driver->dev_priv_size;
1070                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1071                 if (!buf->dev_private) {
1072                         /* Set count correctly so we free the proper amount. */
1073                         entry->buf_count = count;
1074                         drm_cleanup_buf_error(dev, entry);
1075                         mutex_unlock(&dev->struct_mutex);
1076                         atomic_dec(&dev->buf_alloc);
1077                         return -ENOMEM;
1078                 }
1079
1080                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1081
1082                 offset += alignment;
1083                 entry->buf_count++;
1084                 byte_count += PAGE_SIZE << page_order;
1085         }
1086
1087         DRM_DEBUG("byte_count: %d\n", byte_count);
1088
1089         temp_buflist = krealloc(dma->buflist,
1090                                 (dma->buf_count + entry->buf_count) *
1091                                 sizeof(*dma->buflist), GFP_KERNEL);
1092         if (!temp_buflist) {
1093                 /* Free the entry because it isn't valid */
1094                 drm_cleanup_buf_error(dev, entry);
1095                 mutex_unlock(&dev->struct_mutex);
1096                 atomic_dec(&dev->buf_alloc);
1097                 return -ENOMEM;
1098         }
1099         dma->buflist = temp_buflist;
1100
1101         for (i = 0; i < entry->buf_count; i++) {
1102                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1103         }
1104
1105         dma->buf_count += entry->buf_count;
1106         dma->seg_count += entry->seg_count;
1107         dma->page_count += byte_count >> PAGE_SHIFT;
1108         dma->byte_count += byte_count;
1109
1110         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1111         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1112
1113         mutex_unlock(&dev->struct_mutex);
1114
1115         request->count = entry->buf_count;
1116         request->size = size;
1117
1118         dma->flags = _DRM_DMA_USE_SG;
1119
1120         atomic_dec(&dev->buf_alloc);
1121         return 0;
1122 }
1123
1124 /**
1125  * Add buffers for DMA transfers (ioctl).
1126  *
1127  * \param inode device inode.
1128  * \param file_priv DRM file private.
1129  * \param cmd command.
1130  * \param arg pointer to a struct drm_buf_desc request.
1131  * \return zero on success or a negative number on failure.
1132  *
1133  * According with the memory type specified in drm_buf_desc::flags and the
1134  * build options, it dispatches the call either to addbufs_agp(),
1135  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1136  * PCI memory respectively.
1137  */
1138 int drm_addbufs(struct drm_device *dev, void *data,
1139                 struct drm_file *file_priv)
1140 {
1141         struct drm_buf_desc *request = data;
1142         int ret;
1143
1144         if (drm_core_check_feature(dev, DRIVER_MODESET))
1145                 return -EINVAL;
1146
1147         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1148                 return -EINVAL;
1149
1150 #if __OS_HAS_AGP
1151         if (request->flags & _DRM_AGP_BUFFER)
1152                 ret = drm_addbufs_agp(dev, request);
1153         else
1154 #endif
1155         if (request->flags & _DRM_SG_BUFFER)
1156                 ret = drm_addbufs_sg(dev, request);
1157         else if (request->flags & _DRM_FB_BUFFER)
1158                 ret = -EINVAL;
1159         else
1160                 ret = drm_addbufs_pci(dev, request);
1161
1162         return ret;
1163 }
1164
1165 /**
1166  * Get information about the buffer mappings.
1167  *
1168  * This was originally mean for debugging purposes, or by a sophisticated
1169  * client library to determine how best to use the available buffers (e.g.,
1170  * large buffers can be used for image transfer).
1171  *
1172  * \param inode device inode.
1173  * \param file_priv DRM file private.
1174  * \param cmd command.
1175  * \param arg pointer to a drm_buf_info structure.
1176  * \return zero on success or a negative number on failure.
1177  *
1178  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1179  * lock, preventing of allocating more buffers after this call. Information
1180  * about each requested buffer is then copied into user space.
1181  */
1182 int drm_infobufs(struct drm_device *dev, void *data,
1183                  struct drm_file *file_priv)
1184 {
1185         struct drm_device_dma *dma = dev->dma;
1186         struct drm_buf_info *request = data;
1187         int i;
1188         int count;
1189
1190         if (drm_core_check_feature(dev, DRIVER_MODESET))
1191                 return -EINVAL;
1192
1193         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1194                 return -EINVAL;
1195
1196         if (!dma)
1197                 return -EINVAL;
1198
1199         spin_lock(&dev->buf_lock);
1200         if (atomic_read(&dev->buf_alloc)) {
1201                 spin_unlock(&dev->buf_lock);
1202                 return -EBUSY;
1203         }
1204         ++dev->buf_use;         /* Can't allocate more after this call */
1205         spin_unlock(&dev->buf_lock);
1206
1207         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1208                 if (dma->bufs[i].buf_count)
1209                         ++count;
1210         }
1211
1212         DRM_DEBUG("count = %d\n", count);
1213
1214         if (request->count >= count) {
1215                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1216                         if (dma->bufs[i].buf_count) {
1217                                 struct drm_buf_desc __user *to =
1218                                     &request->list[count];
1219                                 struct drm_buf_entry *from = &dma->bufs[i];
1220                                 if (copy_to_user(&to->count,
1221                                                  &from->buf_count,
1222                                                  sizeof(from->buf_count)) ||
1223                                     copy_to_user(&to->size,
1224                                                  &from->buf_size,
1225                                                  sizeof(from->buf_size)) ||
1226                                     copy_to_user(&to->low_mark,
1227                                                  &from->low_mark,
1228                                                  sizeof(from->low_mark)) ||
1229                                     copy_to_user(&to->high_mark,
1230                                                  &from->high_mark,
1231                                                  sizeof(from->high_mark)))
1232                                         return -EFAULT;
1233
1234                                 DRM_DEBUG("%d %d %d %d %d\n",
1235                                           i,
1236                                           dma->bufs[i].buf_count,
1237                                           dma->bufs[i].buf_size,
1238                                           dma->bufs[i].low_mark,
1239                                           dma->bufs[i].high_mark);
1240                                 ++count;
1241                         }
1242                 }
1243         }
1244         request->count = count;
1245
1246         return 0;
1247 }
1248
1249 /**
1250  * Specifies a low and high water mark for buffer allocation
1251  *
1252  * \param inode device inode.
1253  * \param file_priv DRM file private.
1254  * \param cmd command.
1255  * \param arg a pointer to a drm_buf_desc structure.
1256  * \return zero on success or a negative number on failure.
1257  *
1258  * Verifies that the size order is bounded between the admissible orders and
1259  * updates the respective drm_device_dma::bufs entry low and high water mark.
1260  *
1261  * \note This ioctl is deprecated and mostly never used.
1262  */
1263 int drm_markbufs(struct drm_device *dev, void *data,
1264                  struct drm_file *file_priv)
1265 {
1266         struct drm_device_dma *dma = dev->dma;
1267         struct drm_buf_desc *request = data;
1268         int order;
1269         struct drm_buf_entry *entry;
1270
1271         if (drm_core_check_feature(dev, DRIVER_MODESET))
1272                 return -EINVAL;
1273
1274         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1275                 return -EINVAL;
1276
1277         if (!dma)
1278                 return -EINVAL;
1279
1280         DRM_DEBUG("%d, %d, %d\n",
1281                   request->size, request->low_mark, request->high_mark);
1282         order = order_base_2(request->size);
1283         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1284                 return -EINVAL;
1285         entry = &dma->bufs[order];
1286
1287         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1288                 return -EINVAL;
1289         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1290                 return -EINVAL;
1291
1292         entry->low_mark = request->low_mark;
1293         entry->high_mark = request->high_mark;
1294
1295         return 0;
1296 }
1297
1298 /**
1299  * Unreserve the buffers in list, previously reserved using drmDMA.
1300  *
1301  * \param inode device inode.
1302  * \param file_priv DRM file private.
1303  * \param cmd command.
1304  * \param arg pointer to a drm_buf_free structure.
1305  * \return zero on success or a negative number on failure.
1306  *
1307  * Calls free_buffer() for each used buffer.
1308  * This function is primarily used for debugging.
1309  */
1310 int drm_freebufs(struct drm_device *dev, void *data,
1311                  struct drm_file *file_priv)
1312 {
1313         struct drm_device_dma *dma = dev->dma;
1314         struct drm_buf_free *request = data;
1315         int i;
1316         int idx;
1317         struct drm_buf *buf;
1318
1319         if (drm_core_check_feature(dev, DRIVER_MODESET))
1320                 return -EINVAL;
1321
1322         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1323                 return -EINVAL;
1324
1325         if (!dma)
1326                 return -EINVAL;
1327
1328         DRM_DEBUG("%d\n", request->count);
1329         for (i = 0; i < request->count; i++) {
1330                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1331                         return -EFAULT;
1332                 if (idx < 0 || idx >= dma->buf_count) {
1333                         DRM_ERROR("Index %d (of %d max)\n",
1334                                   idx, dma->buf_count - 1);
1335                         return -EINVAL;
1336                 }
1337                 buf = dma->buflist[idx];
1338                 if (buf->file_priv != file_priv) {
1339                         DRM_ERROR("Process %d freeing buffer not owned\n",
1340                                   task_pid_nr(current));
1341                         return -EINVAL;
1342                 }
1343                 drm_free_buffer(dev, buf);
1344         }
1345
1346         return 0;
1347 }
1348
1349 /**
1350  * Maps all of the DMA buffers into client-virtual space (ioctl).
1351  *
1352  * \param inode device inode.
1353  * \param file_priv DRM file private.
1354  * \param cmd command.
1355  * \param arg pointer to a drm_buf_map structure.
1356  * \return zero on success or a negative number on failure.
1357  *
1358  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1359  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1360  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1361  * drm_mmap_dma().
1362  */
1363 int drm_mapbufs(struct drm_device *dev, void *data,
1364                 struct drm_file *file_priv)
1365 {
1366         struct drm_device_dma *dma = dev->dma;
1367         int retcode = 0;
1368         const int zero = 0;
1369         unsigned long virtual;
1370         unsigned long address;
1371         struct drm_buf_map *request = data;
1372         int i;
1373
1374         if (drm_core_check_feature(dev, DRIVER_MODESET))
1375                 return -EINVAL;
1376
1377         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1378                 return -EINVAL;
1379
1380         if (!dma)
1381                 return -EINVAL;
1382
1383         spin_lock(&dev->buf_lock);
1384         if (atomic_read(&dev->buf_alloc)) {
1385                 spin_unlock(&dev->buf_lock);
1386                 return -EBUSY;
1387         }
1388         dev->buf_use++;         /* Can't allocate more after this call */
1389         spin_unlock(&dev->buf_lock);
1390
1391         if (request->count >= dma->buf_count) {
1392                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1393                     || (drm_core_check_feature(dev, DRIVER_SG)
1394                         && (dma->flags & _DRM_DMA_USE_SG))) {
1395                         struct drm_local_map *map = dev->agp_buffer_map;
1396                         unsigned long token = dev->agp_buffer_token;
1397
1398                         if (!map) {
1399                                 retcode = -EINVAL;
1400                                 goto done;
1401                         }
1402                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1403                                           PROT_READ | PROT_WRITE,
1404                                           MAP_SHARED,
1405                                           token);
1406                 } else {
1407                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1408                                           PROT_READ | PROT_WRITE,
1409                                           MAP_SHARED, 0);
1410                 }
1411                 if (virtual > -1024UL) {
1412                         /* Real error */
1413                         retcode = (signed long)virtual;
1414                         goto done;
1415                 }
1416                 request->virtual = (void __user *)virtual;
1417
1418                 for (i = 0; i < dma->buf_count; i++) {
1419                         if (copy_to_user(&request->list[i].idx,
1420                                          &dma->buflist[i]->idx,
1421                                          sizeof(request->list[0].idx))) {
1422                                 retcode = -EFAULT;
1423                                 goto done;
1424                         }
1425                         if (copy_to_user(&request->list[i].total,
1426                                          &dma->buflist[i]->total,
1427                                          sizeof(request->list[0].total))) {
1428                                 retcode = -EFAULT;
1429                                 goto done;
1430                         }
1431                         if (copy_to_user(&request->list[i].used,
1432                                          &zero, sizeof(zero))) {
1433                                 retcode = -EFAULT;
1434                                 goto done;
1435                         }
1436                         address = virtual + dma->buflist[i]->offset;    /* *** */
1437                         if (copy_to_user(&request->list[i].address,
1438                                          &address, sizeof(address))) {
1439                                 retcode = -EFAULT;
1440                                 goto done;
1441                         }
1442                 }
1443         }
1444       done:
1445         request->count = dma->buf_count;
1446         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1447
1448         return retcode;
1449 }
1450
1451 int drm_dma_ioctl(struct drm_device *dev, void *data,
1452                   struct drm_file *file_priv)
1453 {
1454         if (drm_core_check_feature(dev, DRIVER_MODESET))
1455                 return -EINVAL;
1456
1457         if (dev->driver->dma_ioctl)
1458                 return dev->driver->dma_ioctl(dev, data, file_priv);
1459         else
1460                 return -EINVAL;
1461 }
1462
1463 struct drm_local_map *drm_getsarea(struct drm_device *dev)
1464 {
1465         struct drm_map_list *entry;
1466
1467         list_for_each_entry(entry, &dev->maplist, head) {
1468                 if (entry->map && entry->map->type == _DRM_SHM &&
1469                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1470                         return entry->map;
1471                 }
1472         }
1473         return NULL;
1474 }
1475 EXPORT_SYMBOL(drm_getsarea);