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