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 (drm_core_has_MTRR(dev)) {
 211                         if (map->type == _DRM_FRAME_BUFFER ||
 212                             (map->flags & _DRM_WRITE_COMBINING)) {
 213                                 map->mtrr =
 214                                         arch_phys_wc_add(map->offset, map->size);
 215                         }
 216                 }
 217                 if (map->type == _DRM_REGISTERS) {
 218                         if (map->flags & _DRM_WRITE_COMBINING)
 219                                 map->handle = ioremap_wc(map->offset,
 220                                                          map->size);
 221                         else
 222                                 map->handle = ioremap(map->offset, map->size);
 223                         if (!map->handle) {
 224                                 kfree(map);
 225                                 return -ENOMEM;
 226                         }
 227                 }
 228
 229                 break;
 230         case _DRM_SHM:
 231                 list = drm_find_matching_map(dev, map);
 232                 if (list != NULL) {
 233                         if(list->map->size != map->size) {
 234                                 DRM_DEBUG("Matching maps of type %d with "
 235                                           "mismatched sizes, (%ld vs %ld)\n",
 236                                           map->type, map->size, list->map->size);
 237                                 list->map->size = map->size;
 238                         }
 239
 240                         kfree(map);
 241                         *maplist = list;
 242                         return 0;
 243                 }
 244                 map->handle = vmalloc_user(map->size);
 245                 DRM_DEBUG("%lu %d %p\n",
 246                           map->size, drm_order(map->size), map->handle);
 247                 if (!map->handle) {
 248                         kfree(map);
 249                         return -ENOMEM;
 250                 }
 251                 map->offset = (unsigned long)map->handle;
 252                 if (map->flags & _DRM_CONTAINS_LOCK) {
 253                         /* Prevent a 2nd X Server from creating a 2nd lock */
 254                         if (dev->primary->master->lock.hw_lock != NULL) {
 255                                 vfree(map->handle);
 256                                 kfree(map);
 257                                 return -EBUSY;
 258                         }
 259                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 260                 }
 261                 break;
 262         case _DRM_AGP: {
 263                 struct drm_agp_mem *entry;
 264                 int valid = 0;
 265
 266                 if (!drm_core_has_AGP(dev)) {
 267                         kfree(map);
 268                         return -EINVAL;
 269                 }
 270 #ifdef __alpha__
 271                 map->offset += dev->hose->mem_space->start;
 272 #endif
 273                 /* In some cases (i810 driver), user space may have already
 274                  * added the AGP base itself, because dev->agp->base previously
 275                  * only got set during AGP enable.  So, only add the base
 276                  * address if the map's offset isn't already within the
 277                  * aperture.
 278                  */
 279                 if (map->offset < dev->agp->base ||
 280                     map->offset > dev->agp->base +
 281                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 282                         map->offset += dev->agp->base;
 283                 }
 284                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 285
 286                 /* This assumes the DRM is in total control of AGP space.
 287                  * It's not always the case as AGP can be in the control
 288                  * of user space (i.e. i810 driver). So this loop will get
 289                  * skipped and we double check that dev->agp->memory is
 290                  * actually set as well as being invalid before EPERM'ing
 291                  */
 292                 list_for_each_entry(entry, &dev->agp->memory, head) {
 293                         if ((map->offset >= entry->bound) &&
 294                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 295                                 valid = 1;
 296                                 break;
 297                         }
 298                 }
 299                 if (!list_empty(&dev->agp->memory) && !valid) {
 300                         kfree(map);
 301                         return -EPERM;
 302                 }
 303                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 304                           (unsigned long long)map->offset, map->size);
 305
 306                 break;
 307         }
 308         case _DRM_GEM:
 309                 DRM_ERROR("tried to addmap GEM object\n");
 310                 break;
 311         case _DRM_SCATTER_GATHER:
 312                 if (!dev->sg) {
 313                         kfree(map);
 314                         return -EINVAL;
 315                 }
 316                 map->offset += (unsigned long)dev->sg->virtual;
 317                 break;
 318         case _DRM_CONSISTENT:
 319                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 320                  * As we're limiting the address to 2^32-1 (or less),
 321                  * casting it down to 32 bits is no problem, but we
 322                  * need to point to a 64bit variable first. */
 323                 dmah = drm_pci_alloc(dev, map->size, map->size);
 324                 if (!dmah) {
 325                         kfree(map);
 326                         return -ENOMEM;
 327                 }
 328                 map->handle = dmah->vaddr;
 329                 map->offset = (unsigned long)dmah->busaddr;
 330                 kfree(dmah);
 331                 break;
 332         default:
 333                 kfree(map);
 334                 return -EINVAL;
 335         }
 336
 337         list = kzalloc(sizeof(*list), GFP_KERNEL);
 338         if (!list) {
 339                 if (map->type == _DRM_REGISTERS)
 340                         iounmap(map->handle);
 341                 kfree(map);
 342                 return -EINVAL;
 343         }
 344         list->map = map;
 345
 346         mutex_lock(&dev->struct_mutex);
 347         list_add(&list->head, &dev->maplist);
 348
 349         /* Assign a 32-bit handle */
 350         /* We do it here so that dev->struct_mutex protects the increment */
 351         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 352                 map->offset;
 353         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 354                              (map->type == _DRM_SHM));
 355         if (ret) {
 356                 if (map->type == _DRM_REGISTERS)
 357                         iounmap(map->handle);
 358                 kfree(map);
 359                 kfree(list);
 360                 mutex_unlock(&dev->struct_mutex);
 361                 return ret;
 362         }
 363
 364         list->user_token = list->hash.key << PAGE_SHIFT;
 365         mutex_unlock(&dev->struct_mutex);
 366
 367         if (!(map->flags & _DRM_DRIVER))
 368                 list->master = dev->primary->master;
 369         *maplist = list;
 370         return 0;
 371         }
 372
 373 int drm_addmap(struct drm_device * dev, resource_size_t offset,
 374                unsigned int size, enum drm_map_type type,
 375                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 376 {
 377         struct drm_map_list *list;
 378         int rc;
 379
 380         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 381         if (!rc)
 382                 *map_ptr = list->map;
 383         return rc;
 384 }
 385
 386 EXPORT_SYMBOL(drm_addmap);
 387
 388 /**
 389  * Ioctl to specify a range of memory that is available for mapping by a
 390  * non-root process.
 391  *
 392  * \param inode device inode.
 393  * \param file_priv DRM file private.
 394  * \param cmd command.
 395  * \param arg pointer to a drm_map structure.
 396  * \return zero on success or a negative value on error.
 397  *
 398  */
 399 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 400                      struct drm_file *file_priv)
 401 {
 402         struct drm_map *map = data;
 403         struct drm_map_list *maplist;
 404         int err;
 405
 406         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 407                 return -EPERM;
 408
 409         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 410                               map->flags, &maplist);
 411
 412         if (err)
 413                 return err;
 414
 415         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 416         map->handle = (void *)(unsigned long)maplist->user_token;
 417
 418         /*
 419          * It appears that there are no users of this value whatsoever --
 420          * drmAddMap just discards it.  Let's not encourage its use.
 421          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 422          *  it's not a real mtrr index anymore.)
 423          */
 424         map->mtrr = -1;
 425
 426         return 0;
 427 }
 428
 429 /**
 430  * Remove a map private from list and deallocate resources if the mapping
 431  * isn't in use.
 432  *
 433  * Searches the map on drm_device::maplist, removes it from the list, see if
 434  * its being used, and free any associate resource (such as MTRR's) if it's not
 435  * being on use.
 436  *
 437  * \sa drm_addmap
 438  */
 439 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 440 {
 441         struct drm_map_list *r_list = NULL, *list_t;
 442         drm_dma_handle_t dmah;
 443         int found = 0;
 444         struct drm_master *master;
 445
 446         /* Find the list entry for the map and remove it */
 447         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 448                 if (r_list->map == map) {
 449                         master = r_list->master;
 450                         list_del(&r_list->head);
 451                         drm_ht_remove_key(&dev->map_hash,
 452                                           r_list->user_token >> PAGE_SHIFT);
 453                         kfree(r_list);
 454                         found = 1;
 455                         break;
 456                 }
 457         }
 458
 459         if (!found)
 460                 return -EINVAL;
 461
 462         switch (map->type) {
 463         case _DRM_REGISTERS:
 464                 iounmap(map->handle);
 465                 /* FALLTHROUGH */
 466         case _DRM_FRAME_BUFFER:
 467                 if (drm_core_has_MTRR(dev))
 468                         arch_phys_wc_del(map->mtrr);
 469                 break;
 470         case _DRM_SHM:
 471                 vfree(map->handle);
 472                 if (master) {
 473                         if (dev->sigdata.lock == master->lock.hw_lock)
 474                                 dev->sigdata.lock = NULL;
 475                         master->lock.hw_lock = NULL;   /* SHM removed */
 476                         master->lock.file_priv = NULL;
 477                         wake_up_interruptible_all(&master->lock.lock_queue);
 478                 }
 479                 break;
 480         case _DRM_AGP:
 481         case _DRM_SCATTER_GATHER:
 482                 break;
 483         case _DRM_CONSISTENT:
 484                 dmah.vaddr = map->handle;
 485                 dmah.busaddr = map->offset;
 486                 dmah.size = map->size;
 487                 __drm_pci_free(dev, &dmah);
 488                 break;
 489         case _DRM_GEM:
 490                 DRM_ERROR("tried to rmmap GEM object\n");
 491                 break;
 492         }
 493         kfree(map);
 494
 495         return 0;
 496 }
 497 EXPORT_SYMBOL(drm_rmmap_locked);
 498
 499 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 500 {
 501         int ret;
 502
 503         mutex_lock(&dev->struct_mutex);
 504         ret = drm_rmmap_locked(dev, map);
 505         mutex_unlock(&dev->struct_mutex);
 506
 507         return ret;
 508 }
 509 EXPORT_SYMBOL(drm_rmmap);
 510
 511 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 512  * the last close of the device, and this is necessary for cleanup when things
 513  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 514  * like a pointless exercise since they're going away anyway.
 515  *
 516  * One use case might be after addmap is allowed for normal users for SHM and
 517  * gets used by drivers that the server doesn't need to care about.  This seems
 518  * unlikely.
 519  *
 520  * \param inode device inode.
 521  * \param file_priv DRM file private.
 522  * \param cmd command.
 523  * \param arg pointer to a struct drm_map structure.
 524  * \return zero on success or a negative value on error.
 525  */
 526 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 527                     struct drm_file *file_priv)
 528 {
 529         struct drm_map *request = data;
 530         struct drm_local_map *map = NULL;
 531         struct drm_map_list *r_list;
 532         int ret;
 533
 534         mutex_lock(&dev->struct_mutex);
 535         list_for_each_entry(r_list, &dev->maplist, head) {
 536                 if (r_list->map &&
 537                     r_list->user_token == (unsigned long)request->handle &&
 538                     r_list->map->flags & _DRM_REMOVABLE) {
 539                         map = r_list->map;
 540                         break;
 541                 }
 542         }
 543
 544         /* List has wrapped around to the head pointer, or its empty we didn't
 545          * find anything.
 546          */
 547         if (list_empty(&dev->maplist) || !map) {
 548                 mutex_unlock(&dev->struct_mutex);
 549                 return -EINVAL;
 550         }
 551
 552         /* Register and framebuffer maps are permanent */
 553         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 554                 mutex_unlock(&dev->struct_mutex);
 555                 return 0;
 556         }
 557
 558         ret = drm_rmmap_locked(dev, map);
 559
 560         mutex_unlock(&dev->struct_mutex);
 561
 562         return ret;
 563 }
 564
 565 /**
 566  * Cleanup after an error on one of the addbufs() functions.
 567  *
 568  * \param dev DRM device.
 569  * \param entry buffer entry where the error occurred.
 570  *
 571  * Frees any pages and buffers associated with the given entry.
 572  */
 573 static void drm_cleanup_buf_error(struct drm_device * dev,
 574                                   struct drm_buf_entry * entry)
 575 {
 576         int i;
 577
 578         if (entry->seg_count) {
 579                 for (i = 0; i < entry->seg_count; i++) {
 580                         if (entry->seglist[i]) {
 581                                 drm_pci_free(dev, entry->seglist[i]);
 582                         }
 583                 }
 584                 kfree(entry->seglist);
 585
 586                 entry->seg_count = 0;
 587         }
 588
 589         if (entry->buf_count) {
 590                 for (i = 0; i < entry->buf_count; i++) {
 591                         kfree(entry->buflist[i].dev_private);
 592                 }
 593                 kfree(entry->buflist);
 594
 595                 entry->buf_count = 0;
 596         }
 597 }
 598
 599 #if __OS_HAS_AGP
 600 /**
 601  * Add AGP buffers for DMA transfers.
 602  *
 603  * \param dev struct drm_device to which the buffers are to be added.
 604  * \param request pointer to a struct drm_buf_desc describing the request.
 605  * \return zero on success or a negative number on failure.
 606  *
 607  * After some sanity checks creates a drm_buf structure for each buffer and
 608  * reallocates the buffer list of the same size order to accommodate the new
 609  * buffers.
 610  */
 611 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 612 {
 613         struct drm_device_dma *dma = dev->dma;
 614         struct drm_buf_entry *entry;
 615         struct drm_agp_mem *agp_entry;
 616         struct drm_buf *buf;
 617         unsigned long offset;
 618         unsigned long agp_offset;
 619         int count;
 620         int order;
 621         int size;
 622         int alignment;
 623         int page_order;
 624         int total;
 625         int byte_count;
 626         int i, valid;
 627         struct drm_buf **temp_buflist;
 628
 629         if (!dma)
 630                 return -EINVAL;
 631
 632         count = request->count;
 633         order = drm_order(request->size);
 634         size = 1 << order;
 635
 636         alignment = (request->flags & _DRM_PAGE_ALIGN)
 637             ? PAGE_ALIGN(size) : size;
 638         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 639         total = PAGE_SIZE << page_order;
 640
 641         byte_count = 0;
 642         agp_offset = dev->agp->base + request->agp_start;
 643
 644         DRM_DEBUG("count:      %d\n", count);
 645         DRM_DEBUG("order:      %d\n", order);
 646         DRM_DEBUG("size:       %d\n", size);
 647         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 648         DRM_DEBUG("alignment:  %d\n", alignment);
 649         DRM_DEBUG("page_order: %d\n", page_order);
 650         DRM_DEBUG("total:      %d\n", total);
 651
 652         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 653                 return -EINVAL;
 654
 655         /* Make sure buffers are located in AGP memory that we own */
 656         valid = 0;
 657         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 658                 if ((agp_offset >= agp_entry->bound) &&
 659                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 660                         valid = 1;
 661                         break;
 662                 }
 663         }
 664         if (!list_empty(&dev->agp->memory) && !valid) {
 665                 DRM_DEBUG("zone invalid\n");
 666                 return -EINVAL;
 667         }
 668         spin_lock(&dev->count_lock);
 669         if (dev->buf_use) {
 670                 spin_unlock(&dev->count_lock);
 671                 return -EBUSY;
 672         }
 673         atomic_inc(&dev->buf_alloc);
 674         spin_unlock(&dev->count_lock);
 675
 676         mutex_lock(&dev->struct_mutex);
 677         entry = &dma->bufs[order];
 678         if (entry->buf_count) {
 679                 mutex_unlock(&dev->struct_mutex);
 680                 atomic_dec(&dev->buf_alloc);
 681                 return -ENOMEM; /* May only call once for each order */
 682         }
 683
 684         if (count < 0 || count > 4096) {
 685                 mutex_unlock(&dev->struct_mutex);
 686                 atomic_dec(&dev->buf_alloc);
 687                 return -EINVAL;
 688         }
 689
 690         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 691         if (!entry->buflist) {
 692                 mutex_unlock(&dev->struct_mutex);
 693                 atomic_dec(&dev->buf_alloc);
 694                 return -ENOMEM;
 695         }
 696
 697         entry->buf_size = size;
 698         entry->page_order = page_order;
 699
 700         offset = 0;
 701
 702         while (entry->buf_count < count) {
 703                 buf = &entry->buflist[entry->buf_count];
 704                 buf->idx = dma->buf_count + entry->buf_count;
 705                 buf->total = alignment;
 706                 buf->order = order;
 707                 buf->used = 0;
 708
 709                 buf->offset = (dma->byte_count + offset);
 710                 buf->bus_address = agp_offset + offset;
 711                 buf->address = (void *)(agp_offset + offset);
 712                 buf->next = NULL;
 713                 buf->waiting = 0;
 714                 buf->pending = 0;
 715                 buf->file_priv = NULL;
 716
 717                 buf->dev_priv_size = dev->driver->dev_priv_size;
 718                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 719                 if (!buf->dev_private) {
 720                         /* Set count correctly so we free the proper amount. */
 721                         entry->buf_count = count;
 722                         drm_cleanup_buf_error(dev, entry);
 723                         mutex_unlock(&dev->struct_mutex);
 724                         atomic_dec(&dev->buf_alloc);
 725                         return -ENOMEM;
 726                 }
 727
 728                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 729
 730                 offset += alignment;
 731                 entry->buf_count++;
 732                 byte_count += PAGE_SIZE << page_order;
 733         }
 734
 735         DRM_DEBUG("byte_count: %d\n", byte_count);
 736
 737         temp_buflist = krealloc(dma->buflist,
 738                                 (dma->buf_count + entry->buf_count) *
 739                                 sizeof(*dma->buflist), GFP_KERNEL);
 740         if (!temp_buflist) {
 741                 /* Free the entry because it isn't valid */
 742                 drm_cleanup_buf_error(dev, entry);
 743                 mutex_unlock(&dev->struct_mutex);
 744                 atomic_dec(&dev->buf_alloc);
 745                 return -ENOMEM;
 746         }
 747         dma->buflist = temp_buflist;
 748
 749         for (i = 0; i < entry->buf_count; i++) {
 750                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 751         }
 752
 753         dma->buf_count += entry->buf_count;
 754         dma->seg_count += entry->seg_count;
 755         dma->page_count += byte_count >> PAGE_SHIFT;
 756         dma->byte_count += byte_count;
 757
 758         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 759         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 760
 761         mutex_unlock(&dev->struct_mutex);
 762
 763         request->count = entry->buf_count;
 764         request->size = size;
 765
 766         dma->flags = _DRM_DMA_USE_AGP;
 767
 768         atomic_dec(&dev->buf_alloc);
 769         return 0;
 770 }
 771 EXPORT_SYMBOL(drm_addbufs_agp);
 772 #endif                          /* __OS_HAS_AGP */
 773
 774 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 775 {
 776         struct drm_device_dma *dma = dev->dma;
 777         int count;
 778         int order;
 779         int size;
 780         int total;
 781         int page_order;
 782         struct drm_buf_entry *entry;
 783         drm_dma_handle_t *dmah;
 784         struct drm_buf *buf;
 785         int alignment;
 786         unsigned long offset;
 787         int i;
 788         int byte_count;
 789         int page_count;
 790         unsigned long *temp_pagelist;
 791         struct drm_buf **temp_buflist;
 792
 793         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 794                 return -EINVAL;
 795
 796         if (!dma)
 797                 return -EINVAL;
 798
 799         if (!capable(CAP_SYS_ADMIN))
 800                 return -EPERM;
 801
 802         count = request->count;
 803         order = drm_order(request->size);
 804         size = 1 << order;
 805
 806         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 807                   request->count, request->size, size, order);
 808
 809         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 810                 return -EINVAL;
 811
 812         alignment = (request->flags & _DRM_PAGE_ALIGN)
 813             ? PAGE_ALIGN(size) : size;
 814         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 815         total = PAGE_SIZE << page_order;
 816
 817         spin_lock(&dev->count_lock);
 818         if (dev->buf_use) {
 819                 spin_unlock(&dev->count_lock);
 820                 return -EBUSY;
 821         }
 822         atomic_inc(&dev->buf_alloc);
 823         spin_unlock(&dev->count_lock);
 824
 825         mutex_lock(&dev->struct_mutex);
 826         entry = &dma->bufs[order];
 827         if (entry->buf_count) {
 828                 mutex_unlock(&dev->struct_mutex);
 829                 atomic_dec(&dev->buf_alloc);
 830                 return -ENOMEM; /* May only call once for each order */
 831         }
 832
 833         if (count < 0 || count > 4096) {
 834                 mutex_unlock(&dev->struct_mutex);
 835                 atomic_dec(&dev->buf_alloc);
 836                 return -EINVAL;
 837         }
 838
 839         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 840         if (!entry->buflist) {
 841                 mutex_unlock(&dev->struct_mutex);
 842                 atomic_dec(&dev->buf_alloc);
 843                 return -ENOMEM;
 844         }
 845
 846         entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
 847         if (!entry->seglist) {
 848                 kfree(entry->buflist);
 849                 mutex_unlock(&dev->struct_mutex);
 850                 atomic_dec(&dev->buf_alloc);
 851                 return -ENOMEM;
 852         }
 853
 854         /* Keep the original pagelist until we know all the allocations
 855          * have succeeded
 856          */
 857         temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
 858                                sizeof(*dma->pagelist), GFP_KERNEL);
 859         if (!temp_pagelist) {
 860                 kfree(entry->buflist);
 861                 kfree(entry->seglist);
 862                 mutex_unlock(&dev->struct_mutex);
 863                 atomic_dec(&dev->buf_alloc);
 864                 return -ENOMEM;
 865         }
 866         memcpy(temp_pagelist,
 867                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 868         DRM_DEBUG("pagelist: %d entries\n",
 869                   dma->page_count + (count << page_order));
 870
 871         entry->buf_size = size;
 872         entry->page_order = page_order;
 873         byte_count = 0;
 874         page_count = 0;
 875
 876         while (entry->buf_count < count) {
 877
 878                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 879
 880                 if (!dmah) {
 881                         /* Set count correctly so we free the proper amount. */
 882                         entry->buf_count = count;
 883                         entry->seg_count = count;
 884                         drm_cleanup_buf_error(dev, entry);
 885                         kfree(temp_pagelist);
 886                         mutex_unlock(&dev->struct_mutex);
 887                         atomic_dec(&dev->buf_alloc);
 888                         return -ENOMEM;
 889                 }
 890                 entry->seglist[entry->seg_count++] = dmah;
 891                 for (i = 0; i < (1 << page_order); i++) {
 892                         DRM_DEBUG("page %d @ 0x%08lx\n",
 893                                   dma->page_count + page_count,
 894                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 895                         temp_pagelist[dma->page_count + page_count++]
 896                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 897                 }
 898                 for (offset = 0;
 899                      offset + size <= total && entry->buf_count < count;
 900                      offset += alignment, ++entry->buf_count) {
 901                         buf = &entry->buflist[entry->buf_count];
 902                         buf->idx = dma->buf_count + entry->buf_count;
 903                         buf->total = alignment;
 904                         buf->order = order;
 905                         buf->used = 0;
 906                         buf->offset = (dma->byte_count + byte_count + offset);
 907                         buf->address = (void *)(dmah->vaddr + offset);
 908                         buf->bus_address = dmah->busaddr + offset;
 909                         buf->next = NULL;
 910                         buf->waiting = 0;
 911                         buf->pending = 0;
 912                         buf->file_priv = NULL;
 913
 914                         buf->dev_priv_size = dev->driver->dev_priv_size;
 915                         buf->dev_private = kzalloc(buf->dev_priv_size,
 916                                                 GFP_KERNEL);
 917                         if (!buf->dev_private) {
 918                                 /* Set count correctly so we free the proper amount. */
 919                                 entry->buf_count = count;
 920                                 entry->seg_count = count;
 921                                 drm_cleanup_buf_error(dev, entry);
 922                                 kfree(temp_pagelist);
 923                                 mutex_unlock(&dev->struct_mutex);
 924                                 atomic_dec(&dev->buf_alloc);
 925                                 return -ENOMEM;
 926                         }
 927
 928                         DRM_DEBUG("buffer %d @ %p\n",
 929                                   entry->buf_count, buf->address);
 930                 }
 931                 byte_count += PAGE_SIZE << page_order;
 932         }
 933
 934         temp_buflist = krealloc(dma->buflist,
 935                                 (dma->buf_count + entry->buf_count) *
 936                                 sizeof(*dma->buflist), GFP_KERNEL);
 937         if (!temp_buflist) {
 938                 /* Free the entry because it isn't valid */
 939                 drm_cleanup_buf_error(dev, entry);
 940                 kfree(temp_pagelist);
 941                 mutex_unlock(&dev->struct_mutex);
 942                 atomic_dec(&dev->buf_alloc);
 943                 return -ENOMEM;
 944         }
 945         dma->buflist = temp_buflist;
 946
 947         for (i = 0; i < entry->buf_count; i++) {
 948                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 949         }
 950
 951         /* No allocations failed, so now we can replace the original pagelist
 952          * with the new one.
 953          */
 954         if (dma->page_count) {
 955                 kfree(dma->pagelist);
 956         }
 957         dma->pagelist = temp_pagelist;
 958
 959         dma->buf_count += entry->buf_count;
 960         dma->seg_count += entry->seg_count;
 961         dma->page_count += entry->seg_count << page_order;
 962         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 963
 964         mutex_unlock(&dev->struct_mutex);
 965
 966         request->count = entry->buf_count;
 967         request->size = size;
 968
 969         if (request->flags & _DRM_PCI_BUFFER_RO)
 970                 dma->flags = _DRM_DMA_USE_PCI_RO;
 971
 972         atomic_dec(&dev->buf_alloc);
 973         return 0;
 974
 975 }
 976 EXPORT_SYMBOL(drm_addbufs_pci);
 977
 978 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 979 {
 980         struct drm_device_dma *dma = dev->dma;
 981         struct drm_buf_entry *entry;
 982         struct drm_buf *buf;
 983         unsigned long offset;
 984         unsigned long agp_offset;
 985         int count;
 986         int order;
 987         int size;
 988         int alignment;
 989         int page_order;
 990         int total;
 991         int byte_count;
 992         int i;
 993         struct drm_buf **temp_buflist;
 994
 995         if (!drm_core_check_feature(dev, DRIVER_SG))
 996                 return -EINVAL;
 997
 998         if (!dma)
 999                 return -EINVAL;
1000
1001         if (!capable(CAP_SYS_ADMIN))
1002                 return -EPERM;
1003
1004         count = request->count;
1005         order = drm_order(request->size);
1006         size = 1 << order;
1007
1008         alignment = (request->flags & _DRM_PAGE_ALIGN)
1009             ? PAGE_ALIGN(size) : size;
1010         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1011         total = PAGE_SIZE << page_order;
1012
1013         byte_count = 0;
1014         agp_offset = request->agp_start;
1015
1016         DRM_DEBUG("count:      %d\n", count);
1017         DRM_DEBUG("order:      %d\n", order);
1018         DRM_DEBUG("size:       %d\n", size);
1019         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1020         DRM_DEBUG("alignment:  %d\n", alignment);
1021         DRM_DEBUG("page_order: %d\n", page_order);
1022         DRM_DEBUG("total:      %d\n", total);
1023
1024         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1025                 return -EINVAL;
1026
1027         spin_lock(&dev->count_lock);
1028         if (dev->buf_use) {
1029                 spin_unlock(&dev->count_lock);
1030                 return -EBUSY;
1031         }
1032         atomic_inc(&dev->buf_alloc);
1033         spin_unlock(&dev->count_lock);
1034
1035         mutex_lock(&dev->struct_mutex);
1036         entry = &dma->bufs[order];
1037         if (entry->buf_count) {
1038                 mutex_unlock(&dev->struct_mutex);
1039                 atomic_dec(&dev->buf_alloc);
1040                 return -ENOMEM; /* May only call once for each order */
1041         }
1042
1043         if (count < 0 || count > 4096) {
1044                 mutex_unlock(&dev->struct_mutex);
1045                 atomic_dec(&dev->buf_alloc);
1046                 return -EINVAL;
1047         }
1048
1049         entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1050                                 GFP_KERNEL);
1051         if (!entry->buflist) {
1052                 mutex_unlock(&dev->struct_mutex);
1053                 atomic_dec(&dev->buf_alloc);
1054                 return -ENOMEM;
1055         }
1056
1057         entry->buf_size = size;
1058         entry->page_order = page_order;
1059
1060         offset = 0;
1061
1062         while (entry->buf_count < count) {
1063                 buf = &entry->buflist[entry->buf_count];
1064                 buf->idx = dma->buf_count + entry->buf_count;
1065                 buf->total = alignment;
1066                 buf->order = order;
1067                 buf->used = 0;
1068
1069                 buf->offset = (dma->byte_count + offset);
1070                 buf->bus_address = agp_offset + offset;
1071                 buf->address = (void *)(agp_offset + offset
1072                                         + (unsigned long)dev->sg->virtual);
1073                 buf->next = NULL;
1074                 buf->waiting = 0;
1075                 buf->pending = 0;
1076                 buf->file_priv = NULL;
1077
1078                 buf->dev_priv_size = dev->driver->dev_priv_size;
1079                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1080                 if (!buf->dev_private) {
1081                         /* Set count correctly so we free the proper amount. */
1082                         entry->buf_count = count;
1083                         drm_cleanup_buf_error(dev, entry);
1084                         mutex_unlock(&dev->struct_mutex);
1085                         atomic_dec(&dev->buf_alloc);
1086                         return -ENOMEM;
1087                 }
1088
1089                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1090
1091                 offset += alignment;
1092                 entry->buf_count++;
1093                 byte_count += PAGE_SIZE << page_order;
1094         }
1095
1096         DRM_DEBUG("byte_count: %d\n", byte_count);
1097
1098         temp_buflist = krealloc(dma->buflist,
1099                                 (dma->buf_count + entry->buf_count) *
1100                                 sizeof(*dma->buflist), GFP_KERNEL);
1101         if (!temp_buflist) {
1102                 /* Free the entry because it isn't valid */
1103                 drm_cleanup_buf_error(dev, entry);
1104                 mutex_unlock(&dev->struct_mutex);
1105                 atomic_dec(&dev->buf_alloc);
1106                 return -ENOMEM;
1107         }
1108         dma->buflist = temp_buflist;
1109
1110         for (i = 0; i < entry->buf_count; i++) {
1111                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1112         }
1113
1114         dma->buf_count += entry->buf_count;
1115         dma->seg_count += entry->seg_count;
1116         dma->page_count += byte_count >> PAGE_SHIFT;
1117         dma->byte_count += byte_count;
1118
1119         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1120         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1121
1122         mutex_unlock(&dev->struct_mutex);
1123
1124         request->count = entry->buf_count;
1125         request->size = size;
1126
1127         dma->flags = _DRM_DMA_USE_SG;
1128
1129         atomic_dec(&dev->buf_alloc);
1130         return 0;
1131 }
1132
1133 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1134 {
1135         struct drm_device_dma *dma = dev->dma;
1136         struct drm_buf_entry *entry;
1137         struct drm_buf *buf;
1138         unsigned long offset;
1139         unsigned long agp_offset;
1140         int count;
1141         int order;
1142         int size;
1143         int alignment;
1144         int page_order;
1145         int total;
1146         int byte_count;
1147         int i;
1148         struct drm_buf **temp_buflist;
1149
1150         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1151                 return -EINVAL;
1152
1153         if (!dma)
1154                 return -EINVAL;
1155
1156         if (!capable(CAP_SYS_ADMIN))
1157                 return -EPERM;
1158
1159         count = request->count;
1160         order = drm_order(request->size);
1161         size = 1 << order;
1162
1163         alignment = (request->flags & _DRM_PAGE_ALIGN)
1164             ? PAGE_ALIGN(size) : size;
1165         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1166         total = PAGE_SIZE << page_order;
1167
1168         byte_count = 0;
1169         agp_offset = request->agp_start;
1170
1171         DRM_DEBUG("count:      %d\n", count);
1172         DRM_DEBUG("order:      %d\n", order);
1173         DRM_DEBUG("size:       %d\n", size);
1174         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1175         DRM_DEBUG("alignment:  %d\n", alignment);
1176         DRM_DEBUG("page_order: %d\n", page_order);
1177         DRM_DEBUG("total:      %d\n", total);
1178
1179         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1180                 return -EINVAL;
1181
1182         spin_lock(&dev->count_lock);
1183         if (dev->buf_use) {
1184                 spin_unlock(&dev->count_lock);
1185                 return -EBUSY;
1186         }
1187         atomic_inc(&dev->buf_alloc);
1188         spin_unlock(&dev->count_lock);
1189
1190         mutex_lock(&dev->struct_mutex);
1191         entry = &dma->bufs[order];
1192         if (entry->buf_count) {
1193                 mutex_unlock(&dev->struct_mutex);
1194                 atomic_dec(&dev->buf_alloc);
1195                 return -ENOMEM; /* May only call once for each order */
1196         }
1197
1198         if (count < 0 || count > 4096) {
1199                 mutex_unlock(&dev->struct_mutex);
1200                 atomic_dec(&dev->buf_alloc);
1201                 return -EINVAL;
1202         }
1203
1204         entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1205                                 GFP_KERNEL);
1206         if (!entry->buflist) {
1207                 mutex_unlock(&dev->struct_mutex);
1208                 atomic_dec(&dev->buf_alloc);
1209                 return -ENOMEM;
1210         }
1211
1212         entry->buf_size = size;
1213         entry->page_order = page_order;
1214
1215         offset = 0;
1216
1217         while (entry->buf_count < count) {
1218                 buf = &entry->buflist[entry->buf_count];
1219                 buf->idx = dma->buf_count + entry->buf_count;
1220                 buf->total = alignment;
1221                 buf->order = order;
1222                 buf->used = 0;
1223
1224                 buf->offset = (dma->byte_count + offset);
1225                 buf->bus_address = agp_offset + offset;
1226                 buf->address = (void *)(agp_offset + offset);
1227                 buf->next = NULL;
1228                 buf->waiting = 0;
1229                 buf->pending = 0;
1230                 buf->file_priv = NULL;
1231
1232                 buf->dev_priv_size = dev->driver->dev_priv_size;
1233                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1234                 if (!buf->dev_private) {
1235                         /* Set count correctly so we free the proper amount. */
1236                         entry->buf_count = count;
1237                         drm_cleanup_buf_error(dev, entry);
1238                         mutex_unlock(&dev->struct_mutex);
1239                         atomic_dec(&dev->buf_alloc);
1240                         return -ENOMEM;
1241                 }
1242
1243                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1244
1245                 offset += alignment;
1246                 entry->buf_count++;
1247                 byte_count += PAGE_SIZE << page_order;
1248         }
1249
1250         DRM_DEBUG("byte_count: %d\n", byte_count);
1251
1252         temp_buflist = krealloc(dma->buflist,
1253                                 (dma->buf_count + entry->buf_count) *
1254                                 sizeof(*dma->buflist), GFP_KERNEL);
1255         if (!temp_buflist) {
1256                 /* Free the entry because it isn't valid */
1257                 drm_cleanup_buf_error(dev, entry);
1258                 mutex_unlock(&dev->struct_mutex);
1259                 atomic_dec(&dev->buf_alloc);
1260                 return -ENOMEM;
1261         }
1262         dma->buflist = temp_buflist;
1263
1264         for (i = 0; i < entry->buf_count; i++) {
1265                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1266         }
1267
1268         dma->buf_count += entry->buf_count;
1269         dma->seg_count += entry->seg_count;
1270         dma->page_count += byte_count >> PAGE_SHIFT;
1271         dma->byte_count += byte_count;
1272
1273         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1274         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1275
1276         mutex_unlock(&dev->struct_mutex);
1277
1278         request->count = entry->buf_count;
1279         request->size = size;
1280
1281         dma->flags = _DRM_DMA_USE_FB;
1282
1283         atomic_dec(&dev->buf_alloc);
1284         return 0;
1285 }
1286
1287
1288 /**
1289  * Add buffers for DMA transfers (ioctl).
1290  *
1291  * \param inode device inode.
1292  * \param file_priv DRM file private.
1293  * \param cmd command.
1294  * \param arg pointer to a struct drm_buf_desc request.
1295  * \return zero on success or a negative number on failure.
1296  *
1297  * According with the memory type specified in drm_buf_desc::flags and the
1298  * build options, it dispatches the call either to addbufs_agp(),
1299  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1300  * PCI memory respectively.
1301  */
1302 int drm_addbufs(struct drm_device *dev, void *data,
1303                 struct drm_file *file_priv)
1304 {
1305         struct drm_buf_desc *request = data;
1306         int ret;
1307
1308         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1309                 return -EINVAL;
1310
1311 #if __OS_HAS_AGP
1312         if (request->flags & _DRM_AGP_BUFFER)
1313                 ret = drm_addbufs_agp(dev, request);
1314         else
1315 #endif
1316         if (request->flags & _DRM_SG_BUFFER)
1317                 ret = drm_addbufs_sg(dev, request);
1318         else if (request->flags & _DRM_FB_BUFFER)
1319                 ret = drm_addbufs_fb(dev, request);
1320         else
1321                 ret = drm_addbufs_pci(dev, request);
1322
1323         return ret;
1324 }
1325
1326 /**
1327  * Get information about the buffer mappings.
1328  *
1329  * This was originally mean for debugging purposes, or by a sophisticated
1330  * client library to determine how best to use the available buffers (e.g.,
1331  * large buffers can be used for image transfer).
1332  *
1333  * \param inode device inode.
1334  * \param file_priv DRM file private.
1335  * \param cmd command.
1336  * \param arg pointer to a drm_buf_info structure.
1337  * \return zero on success or a negative number on failure.
1338  *
1339  * Increments drm_device::buf_use while holding the drm_device::count_lock
1340  * lock, preventing of allocating more buffers after this call. Information
1341  * about each requested buffer is then copied into user space.
1342  */
1343 int drm_infobufs(struct drm_device *dev, void *data,
1344                  struct drm_file *file_priv)
1345 {
1346         struct drm_device_dma *dma = dev->dma;
1347         struct drm_buf_info *request = data;
1348         int i;
1349         int count;
1350
1351         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1352                 return -EINVAL;
1353
1354         if (!dma)
1355                 return -EINVAL;
1356
1357         spin_lock(&dev->count_lock);
1358         if (atomic_read(&dev->buf_alloc)) {
1359                 spin_unlock(&dev->count_lock);
1360                 return -EBUSY;
1361         }
1362         ++dev->buf_use;         /* Can't allocate more after this call */
1363         spin_unlock(&dev->count_lock);
1364
1365         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1366                 if (dma->bufs[i].buf_count)
1367                         ++count;
1368         }
1369
1370         DRM_DEBUG("count = %d\n", count);
1371
1372         if (request->count >= count) {
1373                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1374                         if (dma->bufs[i].buf_count) {
1375                                 struct drm_buf_desc __user *to =
1376                                     &request->list[count];
1377                                 struct drm_buf_entry *from = &dma->bufs[i];
1378                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1379                                 if (copy_to_user(&to->count,
1380                                                  &from->buf_count,
1381                                                  sizeof(from->buf_count)) ||
1382                                     copy_to_user(&to->size,
1383                                                  &from->buf_size,
1384                                                  sizeof(from->buf_size)) ||
1385                                     copy_to_user(&to->low_mark,
1386                                                  &list->low_mark,
1387                                                  sizeof(list->low_mark)) ||
1388                                     copy_to_user(&to->high_mark,
1389                                                  &list->high_mark,
1390                                                  sizeof(list->high_mark)))
1391                                         return -EFAULT;
1392
1393                                 DRM_DEBUG("%d %d %d %d %d\n",
1394                                           i,
1395                                           dma->bufs[i].buf_count,
1396                                           dma->bufs[i].buf_size,
1397                                           dma->bufs[i].freelist.low_mark,
1398                                           dma->bufs[i].freelist.high_mark);
1399                                 ++count;
1400                         }
1401                 }
1402         }
1403         request->count = count;
1404
1405         return 0;
1406 }
1407
1408 /**
1409  * Specifies a low and high water mark for buffer allocation
1410  *
1411  * \param inode device inode.
1412  * \param file_priv DRM file private.
1413  * \param cmd command.
1414  * \param arg a pointer to a drm_buf_desc structure.
1415  * \return zero on success or a negative number on failure.
1416  *
1417  * Verifies that the size order is bounded between the admissible orders and
1418  * updates the respective drm_device_dma::bufs entry low and high water mark.
1419  *
1420  * \note This ioctl is deprecated and mostly never used.
1421  */
1422 int drm_markbufs(struct drm_device *dev, void *data,
1423                  struct drm_file *file_priv)
1424 {
1425         struct drm_device_dma *dma = dev->dma;
1426         struct drm_buf_desc *request = data;
1427         int order;
1428         struct drm_buf_entry *entry;
1429
1430         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1431                 return -EINVAL;
1432
1433         if (!dma)
1434                 return -EINVAL;
1435
1436         DRM_DEBUG("%d, %d, %d\n",
1437                   request->size, request->low_mark, request->high_mark);
1438         order = drm_order(request->size);
1439         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1440                 return -EINVAL;
1441         entry = &dma->bufs[order];
1442
1443         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1444                 return -EINVAL;
1445         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1446                 return -EINVAL;
1447
1448         entry->freelist.low_mark = request->low_mark;
1449         entry->freelist.high_mark = request->high_mark;
1450
1451         return 0;
1452 }
1453
1454 /**
1455  * Unreserve the buffers in list, previously reserved using drmDMA.
1456  *
1457  * \param inode device inode.
1458  * \param file_priv DRM file private.
1459  * \param cmd command.
1460  * \param arg pointer to a drm_buf_free structure.
1461  * \return zero on success or a negative number on failure.
1462  *
1463  * Calls free_buffer() for each used buffer.
1464  * This function is primarily used for debugging.
1465  */
1466 int drm_freebufs(struct drm_device *dev, void *data,
1467                  struct drm_file *file_priv)
1468 {
1469         struct drm_device_dma *dma = dev->dma;
1470         struct drm_buf_free *request = data;
1471         int i;
1472         int idx;
1473         struct drm_buf *buf;
1474
1475         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1476                 return -EINVAL;
1477
1478         if (!dma)
1479                 return -EINVAL;
1480
1481         DRM_DEBUG("%d\n", request->count);
1482         for (i = 0; i < request->count; i++) {
1483                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1484                         return -EFAULT;
1485                 if (idx < 0 || idx >= dma->buf_count) {
1486                         DRM_ERROR("Index %d (of %d max)\n",
1487                                   idx, dma->buf_count - 1);
1488                         return -EINVAL;
1489                 }
1490                 buf = dma->buflist[idx];
1491                 if (buf->file_priv != file_priv) {
1492                         DRM_ERROR("Process %d freeing buffer not owned\n",
1493                                   task_pid_nr(current));
1494                         return -EINVAL;
1495                 }
1496                 drm_free_buffer(dev, buf);
1497         }
1498
1499         return 0;
1500 }
1501
1502 /**
1503  * Maps all of the DMA buffers into client-virtual space (ioctl).
1504  *
1505  * \param inode device inode.
1506  * \param file_priv DRM file private.
1507  * \param cmd command.
1508  * \param arg pointer to a drm_buf_map structure.
1509  * \return zero on success or a negative number on failure.
1510  *
1511  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1512  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1513  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1514  * drm_mmap_dma().
1515  */
1516 int drm_mapbufs(struct drm_device *dev, void *data,
1517                 struct drm_file *file_priv)
1518 {
1519         struct drm_device_dma *dma = dev->dma;
1520         int retcode = 0;
1521         const int zero = 0;
1522         unsigned long virtual;
1523         unsigned long address;
1524         struct drm_buf_map *request = data;
1525         int i;
1526
1527         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1528                 return -EINVAL;
1529
1530         if (!dma)
1531                 return -EINVAL;
1532
1533         spin_lock(&dev->count_lock);
1534         if (atomic_read(&dev->buf_alloc)) {
1535                 spin_unlock(&dev->count_lock);
1536                 return -EBUSY;
1537         }
1538         dev->buf_use++;         /* Can't allocate more after this call */
1539         spin_unlock(&dev->count_lock);
1540
1541         if (request->count >= dma->buf_count) {
1542                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1543                     || (drm_core_check_feature(dev, DRIVER_SG)
1544                         && (dma->flags & _DRM_DMA_USE_SG))
1545                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1546                         && (dma->flags & _DRM_DMA_USE_FB))) {
1547                         struct drm_local_map *map = dev->agp_buffer_map;
1548                         unsigned long token = dev->agp_buffer_token;
1549
1550                         if (!map) {
1551                                 retcode = -EINVAL;
1552                                 goto done;
1553                         }
1554                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1555                                           PROT_READ | PROT_WRITE,
1556                                           MAP_SHARED,
1557                                           token);
1558                 } else {
1559                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1560                                           PROT_READ | PROT_WRITE,
1561                                           MAP_SHARED, 0);
1562                 }
1563                 if (virtual > -1024UL) {
1564                         /* Real error */
1565                         retcode = (signed long)virtual;
1566                         goto done;
1567                 }
1568                 request->virtual = (void __user *)virtual;
1569
1570                 for (i = 0; i < dma->buf_count; i++) {
1571                         if (copy_to_user(&request->list[i].idx,
1572                                          &dma->buflist[i]->idx,
1573                                          sizeof(request->list[0].idx))) {
1574                                 retcode = -EFAULT;
1575                                 goto done;
1576                         }
1577                         if (copy_to_user(&request->list[i].total,
1578                                          &dma->buflist[i]->total,
1579                                          sizeof(request->list[0].total))) {
1580                                 retcode = -EFAULT;
1581                                 goto done;
1582                         }
1583                         if (copy_to_user(&request->list[i].used,
1584                                          &zero, sizeof(zero))) {
1585                                 retcode = -EFAULT;
1586                                 goto done;
1587                         }
1588                         address = virtual + dma->buflist[i]->offset;    /* *** */
1589                         if (copy_to_user(&request->list[i].address,
1590                                          &address, sizeof(address))) {
1591                                 retcode = -EFAULT;
1592                                 goto done;
1593                         }
1594                 }
1595         }
1596       done:
1597         request->count = dma->buf_count;
1598         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1599
1600         return retcode;
1601 }
1602
1603 /**
1604  * Compute size order.  Returns the exponent of the smaller power of two which
1605  * is greater or equal to given number.
1606  *
1607  * \param size size.
1608  * \return order.
1609  *
1610  * \todo Can be made faster.
1611  */
1612 int drm_order(unsigned long size)
1613 {
1614         int order;
1615         unsigned long tmp;
1616
1617         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1618
1619         if (size & (size - 1))
1620                 ++order;
1621
1622         return order;
1623 }
1624 EXPORT_SYMBOL(drm_order);