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 <asm/shmparam.h>
  40 #include "drmP.h"
  41
  42 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  43                                                   struct drm_local_map *map)
  44 {
  45         struct drm_map_list *entry;
  46         list_for_each_entry(entry, &dev->maplist, head) {
  47                 /*
  48                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  49                  * while PCI resources may live above that, we ignore the map
  50                  * offset for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  51                  * It is assumed that each driver will have only one resource of
  52                  * each type.
  53                  */
  54                 if (!entry->map ||
  55                     map->type != entry->map->type ||
  56                     entry->master != dev->primary->master)
  57                         continue;
  58                 switch (map->type) {
  59                 case _DRM_SHM:
  60                         if (map->flags != _DRM_CONTAINS_LOCK)
  61                                 break;
  62                 case _DRM_REGISTERS:
  63                 case _DRM_FRAME_BUFFER:
  64                         return entry;
  65                 default: /* Make gcc happy */
  66                         ;
  67                 }
  68                 if (entry->map->offset == map->offset)
  69                         return entry;
  70         }
  71
  72         return NULL;
  73 }
  74
  75 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  76                           unsigned long user_token, int hashed_handle, int shm)
  77 {
  78         int use_hashed_handle, shift;
  79         unsigned long add;
  80
  81 #if (BITS_PER_LONG == 64)
  82         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  83 #elif (BITS_PER_LONG == 32)
  84         use_hashed_handle = hashed_handle;
  85 #else
  86 #error Unsupported long size. Neither 64 nor 32 bits.
  87 #endif
  88
  89         if (!use_hashed_handle) {
  90                 int ret;
  91                 hash->key = user_token >> PAGE_SHIFT;
  92                 ret = drm_ht_insert_item(&dev->map_hash, hash);
  93                 if (ret != -EINVAL)
  94                         return ret;
  95         }
  96
  97         shift = 0;
  98         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
  99         if (shm && (SHMLBA > PAGE_SIZE)) {
 100                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 101
 102                 /* For shared memory, we have to preserve the SHMLBA
 103                  * bits of the eventual vma->vm_pgoff value during
 104                  * mmap().  Otherwise we run into cache aliasing problems
 105                  * on some platforms.  On these platforms, the pgoff of
 106                  * a mmap() request is used to pick a suitable virtual
 107                  * address for the mmap() region such that it will not
 108                  * cause cache aliasing problems.
 109                  *
 110                  * Therefore, make sure the SHMLBA relevant bits of the
 111                  * hash value we use are equal to those in the original
 112                  * kernel virtual address.
 113                  */
 114                 shift = bits;
 115                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 116         }
 117
 118         return drm_ht_just_insert_please(&dev->map_hash, hash,
 119                                          user_token, 32 - PAGE_SHIFT - 3,
 120                                          shift, add);
 121 }
 122
 123 /**
 124  * Core function to create a range of memory available for mapping by a
 125  * non-root process.
 126  *
 127  * Adjusts the memory offset to its absolute value according to the mapping
 128  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 129  * applicable and if supported by the kernel.
 130  */
 131 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 132                            unsigned int size, enum drm_map_type type,
 133                            enum drm_map_flags flags,
 134                            struct drm_map_list ** maplist)
 135 {
 136         struct drm_local_map *map;
 137         struct drm_map_list *list;
 138         drm_dma_handle_t *dmah;
 139         unsigned long user_token;
 140         int ret;
 141
 142         map = kmalloc(sizeof(*map), GFP_KERNEL);
 143         if (!map)
 144                 return -ENOMEM;
 145
 146         map->offset = offset;
 147         map->size = size;
 148         map->flags = flags;
 149         map->type = type;
 150
 151         /* Only allow shared memory to be removable since we only keep enough
 152          * book keeping information about shared memory to allow for removal
 153          * when processes fork.
 154          */
 155         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 156                 kfree(map);
 157                 return -EINVAL;
 158         }
 159         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 160                   (unsigned long long)map->offset, map->size, map->type);
 161
 162         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 163          * hole created by that and it works around various broken drivers that use
 164          * a non-aligned quantity to map the SAREA. --BenH
 165          */
 166         if (map->type == _DRM_SHM)
 167                 map->size = PAGE_ALIGN(map->size);
 168
 169         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 170                 kfree(map);
 171                 return -EINVAL;
 172         }
 173         map->mtrr = -1;
 174         map->handle = NULL;
 175
 176         switch (map->type) {
 177         case _DRM_REGISTERS:
 178         case _DRM_FRAME_BUFFER:
 179 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 180                 if (map->offset + (map->size-1) < map->offset ||
 181                     map->offset < virt_to_phys(high_memory)) {
 182                         kfree(map);
 183                         return -EINVAL;
 184                 }
 185 #endif
 186 #ifdef __alpha__
 187                 map->offset += dev->hose->mem_space->start;
 188 #endif
 189                 /* Some drivers preinitialize some maps, without the X Server
 190                  * needing to be aware of it.  Therefore, we just return success
 191                  * when the server tries to create a duplicate map.
 192                  */
 193                 list = drm_find_matching_map(dev, map);
 194                 if (list != NULL) {
 195                         if (list->map->size != map->size) {
 196                                 DRM_DEBUG("Matching maps of type %d with "
 197                                           "mismatched sizes, (%ld vs %ld)\n",
 198                                           map->type, map->size,
 199                                           list->map->size);
 200                                 list->map->size = map->size;
 201                         }
 202
 203                         kfree(map);
 204                         *maplist = list;
 205                         return 0;
 206                 }
 207
 208                 if (drm_core_has_MTRR(dev)) {
 209                         if (map->type == _DRM_FRAME_BUFFER ||
 210                             (map->flags & _DRM_WRITE_COMBINING)) {
 211                                 map->mtrr = mtrr_add(map->offset, map->size,
 212                                                      MTRR_TYPE_WRCOMB, 1);
 213                         }
 214                 }
 215                 if (map->type == _DRM_REGISTERS) {
 216                         map->handle = ioremap(map->offset, map->size);
 217                         if (!map->handle) {
 218                                 kfree(map);
 219                                 return -ENOMEM;
 220                         }
 221                 }
 222
 223                 break;
 224         case _DRM_SHM:
 225                 list = drm_find_matching_map(dev, map);
 226                 if (list != NULL) {
 227                         if(list->map->size != map->size) {
 228                                 DRM_DEBUG("Matching maps of type %d with "
 229                                           "mismatched sizes, (%ld vs %ld)\n",
 230                                           map->type, map->size, list->map->size);
 231                                 list->map->size = map->size;
 232                         }
 233
 234                         kfree(map);
 235                         *maplist = list;
 236                         return 0;
 237                 }
 238                 map->handle = vmalloc_user(map->size);
 239                 DRM_DEBUG("%lu %d %p\n",
 240                           map->size, drm_order(map->size), map->handle);
 241                 if (!map->handle) {
 242                         kfree(map);
 243                         return -ENOMEM;
 244                 }
 245                 map->offset = (unsigned long)map->handle;
 246                 if (map->flags & _DRM_CONTAINS_LOCK) {
 247                         /* Prevent a 2nd X Server from creating a 2nd lock */
 248                         if (dev->primary->master->lock.hw_lock != NULL) {
 249                                 vfree(map->handle);
 250                                 kfree(map);
 251                                 return -EBUSY;
 252                         }
 253                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 254                 }
 255                 break;
 256         case _DRM_AGP: {
 257                 struct drm_agp_mem *entry;
 258                 int valid = 0;
 259
 260                 if (!drm_core_has_AGP(dev)) {
 261                         kfree(map);
 262                         return -EINVAL;
 263                 }
 264 #ifdef __alpha__
 265                 map->offset += dev->hose->mem_space->start;
 266 #endif
 267                 /* In some cases (i810 driver), user space may have already
 268                  * added the AGP base itself, because dev->agp->base previously
 269                  * only got set during AGP enable.  So, only add the base
 270                  * address if the map's offset isn't already within the
 271                  * aperture.
 272                  */
 273                 if (map->offset < dev->agp->base ||
 274                     map->offset > dev->agp->base +
 275                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 276                         map->offset += dev->agp->base;
 277                 }
 278                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 279
 280                 /* This assumes the DRM is in total control of AGP space.
 281                  * It's not always the case as AGP can be in the control
 282                  * of user space (i.e. i810 driver). So this loop will get
 283                  * skipped and we double check that dev->agp->memory is
 284                  * actually set as well as being invalid before EPERM'ing
 285                  */
 286                 list_for_each_entry(entry, &dev->agp->memory, head) {
 287                         if ((map->offset >= entry->bound) &&
 288                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 289                                 valid = 1;
 290                                 break;
 291                         }
 292                 }
 293                 if (!list_empty(&dev->agp->memory) && !valid) {
 294                         kfree(map);
 295                         return -EPERM;
 296                 }
 297                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 298                           (unsigned long long)map->offset, map->size);
 299
 300                 break;
 301         }
 302         case _DRM_GEM:
 303                 DRM_ERROR("tried to addmap GEM object\n");
 304                 break;
 305         case _DRM_SCATTER_GATHER:
 306                 if (!dev->sg) {
 307                         kfree(map);
 308                         return -EINVAL;
 309                 }
 310                 map->offset += (unsigned long)dev->sg->virtual;
 311                 break;
 312         case _DRM_CONSISTENT:
 313                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 314                  * As we're limiting the address to 2^32-1 (or less),
 315                  * casting it down to 32 bits is no problem, but we
 316                  * need to point to a 64bit variable first. */
 317                 dmah = drm_pci_alloc(dev, map->size, map->size);
 318                 if (!dmah) {
 319                         kfree(map);
 320                         return -ENOMEM;
 321                 }
 322                 map->handle = dmah->vaddr;
 323                 map->offset = (unsigned long)dmah->busaddr;
 324                 kfree(dmah);
 325                 break;
 326         default:
 327                 kfree(map);
 328                 return -EINVAL;
 329         }
 330
 331         list = kzalloc(sizeof(*list), GFP_KERNEL);
 332         if (!list) {
 333                 if (map->type == _DRM_REGISTERS)
 334                         iounmap(map->handle);
 335                 kfree(map);
 336                 return -EINVAL;
 337         }
 338         list->map = map;
 339
 340         mutex_lock(&dev->struct_mutex);
 341         list_add(&list->head, &dev->maplist);
 342
 343         /* Assign a 32-bit handle */
 344         /* We do it here so that dev->struct_mutex protects the increment */
 345         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 346                 map->offset;
 347         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 348                              (map->type == _DRM_SHM));
 349         if (ret) {
 350                 if (map->type == _DRM_REGISTERS)
 351                         iounmap(map->handle);
 352                 kfree(map);
 353                 kfree(list);
 354                 mutex_unlock(&dev->struct_mutex);
 355                 return ret;
 356         }
 357
 358         list->user_token = list->hash.key << PAGE_SHIFT;
 359         mutex_unlock(&dev->struct_mutex);
 360
 361         if (!(map->flags & _DRM_DRIVER))
 362                 list->master = dev->primary->master;
 363         *maplist = list;
 364         return 0;
 365         }
 366
 367 int drm_addmap(struct drm_device * dev, resource_size_t offset,
 368                unsigned int size, enum drm_map_type type,
 369                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 370 {
 371         struct drm_map_list *list;
 372         int rc;
 373
 374         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 375         if (!rc)
 376                 *map_ptr = list->map;
 377         return rc;
 378 }
 379
 380 EXPORT_SYMBOL(drm_addmap);
 381
 382 /**
 383  * Ioctl to specify a range of memory that is available for mapping by a
 384  * non-root process.
 385  *
 386  * \param inode device inode.
 387  * \param file_priv DRM file private.
 388  * \param cmd command.
 389  * \param arg pointer to a drm_map structure.
 390  * \return zero on success or a negative value on error.
 391  *
 392  */
 393 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 394                      struct drm_file *file_priv)
 395 {
 396         struct drm_map *map = data;
 397         struct drm_map_list *maplist;
 398         int err;
 399
 400         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 401                 return -EPERM;
 402
 403         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 404                               map->flags, &maplist);
 405
 406         if (err)
 407                 return err;
 408
 409         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 410         map->handle = (void *)(unsigned long)maplist->user_token;
 411         return 0;
 412 }
 413
 414 /**
 415  * Remove a map private from list and deallocate resources if the mapping
 416  * isn't in use.
 417  *
 418  * Searches the map on drm_device::maplist, removes it from the list, see if
 419  * its being used, and free any associate resource (such as MTRR's) if it's not
 420  * being on use.
 421  *
 422  * \sa drm_addmap
 423  */
 424 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 425 {
 426         struct drm_map_list *r_list = NULL, *list_t;
 427         drm_dma_handle_t dmah;
 428         int found = 0;
 429         struct drm_master *master;
 430
 431         /* Find the list entry for the map and remove it */
 432         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 433                 if (r_list->map == map) {
 434                         master = r_list->master;
 435                         list_del(&r_list->head);
 436                         drm_ht_remove_key(&dev->map_hash,
 437                                           r_list->user_token >> PAGE_SHIFT);
 438                         kfree(r_list);
 439                         found = 1;
 440                         break;
 441                 }
 442         }
 443
 444         if (!found)
 445                 return -EINVAL;
 446
 447         switch (map->type) {
 448         case _DRM_REGISTERS:
 449                 iounmap(map->handle);
 450                 /* FALLTHROUGH */
 451         case _DRM_FRAME_BUFFER:
 452                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 453                         int retcode;
 454                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 455                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 456                 }
 457                 break;
 458         case _DRM_SHM:
 459                 vfree(map->handle);
 460                 if (master) {
 461                         if (dev->sigdata.lock == master->lock.hw_lock)
 462                                 dev->sigdata.lock = NULL;
 463                         master->lock.hw_lock = NULL;   /* SHM removed */
 464                         master->lock.file_priv = NULL;
 465                         wake_up_interruptible_all(&master->lock.lock_queue);
 466                 }
 467                 break;
 468         case _DRM_AGP:
 469         case _DRM_SCATTER_GATHER:
 470                 break;
 471         case _DRM_CONSISTENT:
 472                 dmah.vaddr = map->handle;
 473                 dmah.busaddr = map->offset;
 474                 dmah.size = map->size;
 475                 __drm_pci_free(dev, &dmah);
 476                 break;
 477         case _DRM_GEM:
 478                 DRM_ERROR("tried to rmmap GEM object\n");
 479                 break;
 480         }
 481         kfree(map);
 482
 483         return 0;
 484 }
 485 EXPORT_SYMBOL(drm_rmmap_locked);
 486
 487 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 488 {
 489         int ret;
 490
 491         mutex_lock(&dev->struct_mutex);
 492         ret = drm_rmmap_locked(dev, map);
 493         mutex_unlock(&dev->struct_mutex);
 494
 495         return ret;
 496 }
 497 EXPORT_SYMBOL(drm_rmmap);
 498
 499 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 500  * the last close of the device, and this is necessary for cleanup when things
 501  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 502  * like a pointless exercise since they're going away anyway.
 503  *
 504  * One use case might be after addmap is allowed for normal users for SHM and
 505  * gets used by drivers that the server doesn't need to care about.  This seems
 506  * unlikely.
 507  *
 508  * \param inode device inode.
 509  * \param file_priv DRM file private.
 510  * \param cmd command.
 511  * \param arg pointer to a struct drm_map structure.
 512  * \return zero on success or a negative value on error.
 513  */
 514 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 515                     struct drm_file *file_priv)
 516 {
 517         struct drm_map *request = data;
 518         struct drm_local_map *map = NULL;
 519         struct drm_map_list *r_list;
 520         int ret;
 521
 522         mutex_lock(&dev->struct_mutex);
 523         list_for_each_entry(r_list, &dev->maplist, head) {
 524                 if (r_list->map &&
 525                     r_list->user_token == (unsigned long)request->handle &&
 526                     r_list->map->flags & _DRM_REMOVABLE) {
 527                         map = r_list->map;
 528                         break;
 529                 }
 530         }
 531
 532         /* List has wrapped around to the head pointer, or its empty we didn't
 533          * find anything.
 534          */
 535         if (list_empty(&dev->maplist) || !map) {
 536                 mutex_unlock(&dev->struct_mutex);
 537                 return -EINVAL;
 538         }
 539
 540         /* Register and framebuffer maps are permanent */
 541         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 542                 mutex_unlock(&dev->struct_mutex);
 543                 return 0;
 544         }
 545
 546         ret = drm_rmmap_locked(dev, map);
 547
 548         mutex_unlock(&dev->struct_mutex);
 549
 550         return ret;
 551 }
 552
 553 /**
 554  * Cleanup after an error on one of the addbufs() functions.
 555  *
 556  * \param dev DRM device.
 557  * \param entry buffer entry where the error occurred.
 558  *
 559  * Frees any pages and buffers associated with the given entry.
 560  */
 561 static void drm_cleanup_buf_error(struct drm_device * dev,
 562                                   struct drm_buf_entry * entry)
 563 {
 564         int i;
 565
 566         if (entry->seg_count) {
 567                 for (i = 0; i < entry->seg_count; i++) {
 568                         if (entry->seglist[i]) {
 569                                 drm_pci_free(dev, entry->seglist[i]);
 570                         }
 571                 }
 572                 kfree(entry->seglist);
 573
 574                 entry->seg_count = 0;
 575         }
 576
 577         if (entry->buf_count) {
 578                 for (i = 0; i < entry->buf_count; i++) {
 579                         kfree(entry->buflist[i].dev_private);
 580                 }
 581                 kfree(entry->buflist);
 582
 583                 entry->buf_count = 0;
 584         }
 585 }
 586
 587 #if __OS_HAS_AGP
 588 /**
 589  * Add AGP buffers for DMA transfers.
 590  *
 591  * \param dev struct drm_device to which the buffers are to be added.
 592  * \param request pointer to a struct drm_buf_desc describing the request.
 593  * \return zero on success or a negative number on failure.
 594  *
 595  * After some sanity checks creates a drm_buf structure for each buffer and
 596  * reallocates the buffer list of the same size order to accommodate the new
 597  * buffers.
 598  */
 599 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 600 {
 601         struct drm_device_dma *dma = dev->dma;
 602         struct drm_buf_entry *entry;
 603         struct drm_agp_mem *agp_entry;
 604         struct drm_buf *buf;
 605         unsigned long offset;
 606         unsigned long agp_offset;
 607         int count;
 608         int order;
 609         int size;
 610         int alignment;
 611         int page_order;
 612         int total;
 613         int byte_count;
 614         int i, valid;
 615         struct drm_buf **temp_buflist;
 616
 617         if (!dma)
 618                 return -EINVAL;
 619
 620         count = request->count;
 621         order = drm_order(request->size);
 622         size = 1 << order;
 623
 624         alignment = (request->flags & _DRM_PAGE_ALIGN)
 625             ? PAGE_ALIGN(size) : size;
 626         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 627         total = PAGE_SIZE << page_order;
 628
 629         byte_count = 0;
 630         agp_offset = dev->agp->base + request->agp_start;
 631
 632         DRM_DEBUG("count:      %d\n", count);
 633         DRM_DEBUG("order:      %d\n", order);
 634         DRM_DEBUG("size:       %d\n", size);
 635         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 636         DRM_DEBUG("alignment:  %d\n", alignment);
 637         DRM_DEBUG("page_order: %d\n", page_order);
 638         DRM_DEBUG("total:      %d\n", total);
 639
 640         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 641                 return -EINVAL;
 642         if (dev->queue_count)
 643                 return -EBUSY;  /* Not while in use */
 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                 init_waitqueue_head(&buf->dma_wait);
 706                 buf->file_priv = NULL;
 707
 708                 buf->dev_priv_size = dev->driver->dev_priv_size;
 709                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 710                 if (!buf->dev_private) {
 711                         /* Set count correctly so we free the proper amount. */
 712                         entry->buf_count = count;
 713                         drm_cleanup_buf_error(dev, entry);
 714                         mutex_unlock(&dev->struct_mutex);
 715                         atomic_dec(&dev->buf_alloc);
 716                         return -ENOMEM;
 717                 }
 718
 719                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 720
 721                 offset += alignment;
 722                 entry->buf_count++;
 723                 byte_count += PAGE_SIZE << page_order;
 724         }
 725
 726         DRM_DEBUG("byte_count: %d\n", byte_count);
 727
 728         temp_buflist = krealloc(dma->buflist,
 729                                 (dma->buf_count + entry->buf_count) *
 730                                 sizeof(*dma->buflist), GFP_KERNEL);
 731         if (!temp_buflist) {
 732                 /* Free the entry because it isn't valid */
 733                 drm_cleanup_buf_error(dev, entry);
 734                 mutex_unlock(&dev->struct_mutex);
 735                 atomic_dec(&dev->buf_alloc);
 736                 return -ENOMEM;
 737         }
 738         dma->buflist = temp_buflist;
 739
 740         for (i = 0; i < entry->buf_count; i++) {
 741                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 742         }
 743
 744         dma->buf_count += entry->buf_count;
 745         dma->seg_count += entry->seg_count;
 746         dma->page_count += byte_count >> PAGE_SHIFT;
 747         dma->byte_count += byte_count;
 748
 749         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 750         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 751
 752         mutex_unlock(&dev->struct_mutex);
 753
 754         request->count = entry->buf_count;
 755         request->size = size;
 756
 757         dma->flags = _DRM_DMA_USE_AGP;
 758
 759         atomic_dec(&dev->buf_alloc);
 760         return 0;
 761 }
 762 EXPORT_SYMBOL(drm_addbufs_agp);
 763 #endif                          /* __OS_HAS_AGP */
 764
 765 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 766 {
 767         struct drm_device_dma *dma = dev->dma;
 768         int count;
 769         int order;
 770         int size;
 771         int total;
 772         int page_order;
 773         struct drm_buf_entry *entry;
 774         drm_dma_handle_t *dmah;
 775         struct drm_buf *buf;
 776         int alignment;
 777         unsigned long offset;
 778         int i;
 779         int byte_count;
 780         int page_count;
 781         unsigned long *temp_pagelist;
 782         struct drm_buf **temp_buflist;
 783
 784         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 785                 return -EINVAL;
 786
 787         if (!dma)
 788                 return -EINVAL;
 789
 790         if (!capable(CAP_SYS_ADMIN))
 791                 return -EPERM;
 792
 793         count = request->count;
 794         order = drm_order(request->size);
 795         size = 1 << order;
 796
 797         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 798                   request->count, request->size, size, order, dev->queue_count);
 799
 800         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 801                 return -EINVAL;
 802         if (dev->queue_count)
 803                 return -EBUSY;  /* Not while in use */
 804
 805         alignment = (request->flags & _DRM_PAGE_ALIGN)
 806             ? PAGE_ALIGN(size) : size;
 807         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 808         total = PAGE_SIZE << page_order;
 809
 810         spin_lock(&dev->count_lock);
 811         if (dev->buf_use) {
 812                 spin_unlock(&dev->count_lock);
 813                 return -EBUSY;
 814         }
 815         atomic_inc(&dev->buf_alloc);
 816         spin_unlock(&dev->count_lock);
 817
 818         mutex_lock(&dev->struct_mutex);
 819         entry = &dma->bufs[order];
 820         if (entry->buf_count) {
 821                 mutex_unlock(&dev->struct_mutex);
 822                 atomic_dec(&dev->buf_alloc);
 823                 return -ENOMEM; /* May only call once for each order */
 824         }
 825
 826         if (count < 0 || count > 4096) {
 827                 mutex_unlock(&dev->struct_mutex);
 828                 atomic_dec(&dev->buf_alloc);
 829                 return -EINVAL;
 830         }
 831
 832         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 833         if (!entry->buflist) {
 834                 mutex_unlock(&dev->struct_mutex);
 835                 atomic_dec(&dev->buf_alloc);
 836                 return -ENOMEM;
 837         }
 838
 839         entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
 840         if (!entry->seglist) {
 841                 kfree(entry->buflist);
 842                 mutex_unlock(&dev->struct_mutex);
 843                 atomic_dec(&dev->buf_alloc);
 844                 return -ENOMEM;
 845         }
 846
 847         /* Keep the original pagelist until we know all the allocations
 848          * have succeeded
 849          */
 850         temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
 851                                sizeof(*dma->pagelist), GFP_KERNEL);
 852         if (!temp_pagelist) {
 853                 kfree(entry->buflist);
 854                 kfree(entry->seglist);
 855                 mutex_unlock(&dev->struct_mutex);
 856                 atomic_dec(&dev->buf_alloc);
 857                 return -ENOMEM;
 858         }
 859         memcpy(temp_pagelist,
 860                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 861         DRM_DEBUG("pagelist: %d entries\n",
 862                   dma->page_count + (count << page_order));
 863
 864         entry->buf_size = size;
 865         entry->page_order = page_order;
 866         byte_count = 0;
 867         page_count = 0;
 868
 869         while (entry->buf_count < count) {
 870
 871                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 872
 873                 if (!dmah) {
 874                         /* Set count correctly so we free the proper amount. */
 875                         entry->buf_count = count;
 876                         entry->seg_count = count;
 877                         drm_cleanup_buf_error(dev, entry);
 878                         kfree(temp_pagelist);
 879                         mutex_unlock(&dev->struct_mutex);
 880                         atomic_dec(&dev->buf_alloc);
 881                         return -ENOMEM;
 882                 }
 883                 entry->seglist[entry->seg_count++] = dmah;
 884                 for (i = 0; i < (1 << page_order); i++) {
 885                         DRM_DEBUG("page %d @ 0x%08lx\n",
 886                                   dma->page_count + page_count,
 887                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 888                         temp_pagelist[dma->page_count + page_count++]
 889                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 890                 }
 891                 for (offset = 0;
 892                      offset + size <= total && entry->buf_count < count;
 893                      offset += alignment, ++entry->buf_count) {
 894                         buf = &entry->buflist[entry->buf_count];
 895                         buf->idx = dma->buf_count + entry->buf_count;
 896                         buf->total = alignment;
 897                         buf->order = order;
 898                         buf->used = 0;
 899                         buf->offset = (dma->byte_count + byte_count + offset);
 900                         buf->address = (void *)(dmah->vaddr + offset);
 901                         buf->bus_address = dmah->busaddr + offset;
 902                         buf->next = NULL;
 903                         buf->waiting = 0;
 904                         buf->pending = 0;
 905                         init_waitqueue_head(&buf->dma_wait);
 906                         buf->file_priv = NULL;
 907
 908                         buf->dev_priv_size = dev->driver->dev_priv_size;
 909                         buf->dev_private = kzalloc(buf->dev_priv_size,
 910                                                 GFP_KERNEL);
 911                         if (!buf->dev_private) {
 912                                 /* Set count correctly so we free the proper amount. */
 913                                 entry->buf_count = count;
 914                                 entry->seg_count = count;
 915                                 drm_cleanup_buf_error(dev, entry);
 916                                 kfree(temp_pagelist);
 917                                 mutex_unlock(&dev->struct_mutex);
 918                                 atomic_dec(&dev->buf_alloc);
 919                                 return -ENOMEM;
 920                         }
 921
 922                         DRM_DEBUG("buffer %d @ %p\n",
 923                                   entry->buf_count, buf->address);
 924                 }
 925                 byte_count += PAGE_SIZE << page_order;
 926         }
 927
 928         temp_buflist = krealloc(dma->buflist,
 929                                 (dma->buf_count + entry->buf_count) *
 930                                 sizeof(*dma->buflist), GFP_KERNEL);
 931         if (!temp_buflist) {
 932                 /* Free the entry because it isn't valid */
 933                 drm_cleanup_buf_error(dev, entry);
 934                 kfree(temp_pagelist);
 935                 mutex_unlock(&dev->struct_mutex);
 936                 atomic_dec(&dev->buf_alloc);
 937                 return -ENOMEM;
 938         }
 939         dma->buflist = temp_buflist;
 940
 941         for (i = 0; i < entry->buf_count; i++) {
 942                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 943         }
 944
 945         /* No allocations failed, so now we can replace the original pagelist
 946          * with the new one.
 947          */
 948         if (dma->page_count) {
 949                 kfree(dma->pagelist);
 950         }
 951         dma->pagelist = temp_pagelist;
 952
 953         dma->buf_count += entry->buf_count;
 954         dma->seg_count += entry->seg_count;
 955         dma->page_count += entry->seg_count << page_order;
 956         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 957
 958         mutex_unlock(&dev->struct_mutex);
 959
 960         request->count = entry->buf_count;
 961         request->size = size;
 962
 963         if (request->flags & _DRM_PCI_BUFFER_RO)
 964                 dma->flags = _DRM_DMA_USE_PCI_RO;
 965
 966         atomic_dec(&dev->buf_alloc);
 967         return 0;
 968
 969 }
 970 EXPORT_SYMBOL(drm_addbufs_pci);
 971
 972 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 973 {
 974         struct drm_device_dma *dma = dev->dma;
 975         struct drm_buf_entry *entry;
 976         struct drm_buf *buf;
 977         unsigned long offset;
 978         unsigned long agp_offset;
 979         int count;
 980         int order;
 981         int size;
 982         int alignment;
 983         int page_order;
 984         int total;
 985         int byte_count;
 986         int i;
 987         struct drm_buf **temp_buflist;
 988
 989         if (!drm_core_check_feature(dev, DRIVER_SG))
 990                 return -EINVAL;
 991
 992         if (!dma)
 993                 return -EINVAL;
 994
 995         if (!capable(CAP_SYS_ADMIN))
 996                 return -EPERM;
 997
 998         count = request->count;
 999         order = drm_order(request->size);
1000         size = 1 << order;
1001
1002         alignment = (request->flags & _DRM_PAGE_ALIGN)
1003             ? PAGE_ALIGN(size) : size;
1004         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1005         total = PAGE_SIZE << page_order;
1006
1007         byte_count = 0;
1008         agp_offset = request->agp_start;
1009
1010         DRM_DEBUG("count:      %d\n", count);
1011         DRM_DEBUG("order:      %d\n", order);
1012         DRM_DEBUG("size:       %d\n", size);
1013         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1014         DRM_DEBUG("alignment:  %d\n", alignment);
1015         DRM_DEBUG("page_order: %d\n", page_order);
1016         DRM_DEBUG("total:      %d\n", total);
1017
1018         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1019                 return -EINVAL;
1020         if (dev->queue_count)
1021                 return -EBUSY;  /* Not while in use */
1022
1023         spin_lock(&dev->count_lock);
1024         if (dev->buf_use) {
1025                 spin_unlock(&dev->count_lock);
1026                 return -EBUSY;
1027         }
1028         atomic_inc(&dev->buf_alloc);
1029         spin_unlock(&dev->count_lock);
1030
1031         mutex_lock(&dev->struct_mutex);
1032         entry = &dma->bufs[order];
1033         if (entry->buf_count) {
1034                 mutex_unlock(&dev->struct_mutex);
1035                 atomic_dec(&dev->buf_alloc);
1036                 return -ENOMEM; /* May only call once for each order */
1037         }
1038
1039         if (count < 0 || count > 4096) {
1040                 mutex_unlock(&dev->struct_mutex);
1041                 atomic_dec(&dev->buf_alloc);
1042                 return -EINVAL;
1043         }
1044
1045         entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1046                                 GFP_KERNEL);
1047         if (!entry->buflist) {
1048                 mutex_unlock(&dev->struct_mutex);
1049                 atomic_dec(&dev->buf_alloc);
1050                 return -ENOMEM;
1051         }
1052
1053         entry->buf_size = size;
1054         entry->page_order = page_order;
1055
1056         offset = 0;
1057
1058         while (entry->buf_count < count) {
1059                 buf = &entry->buflist[entry->buf_count];
1060                 buf->idx = dma->buf_count + entry->buf_count;
1061                 buf->total = alignment;
1062                 buf->order = order;
1063                 buf->used = 0;
1064
1065                 buf->offset = (dma->byte_count + offset);
1066                 buf->bus_address = agp_offset + offset;
1067                 buf->address = (void *)(agp_offset + offset
1068                                         + (unsigned long)dev->sg->virtual);
1069                 buf->next = NULL;
1070                 buf->waiting = 0;
1071                 buf->pending = 0;
1072                 init_waitqueue_head(&buf->dma_wait);
1073                 buf->file_priv = NULL;
1074
1075                 buf->dev_priv_size = dev->driver->dev_priv_size;
1076                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1077                 if (!buf->dev_private) {
1078                         /* Set count correctly so we free the proper amount. */
1079                         entry->buf_count = count;
1080                         drm_cleanup_buf_error(dev, entry);
1081                         mutex_unlock(&dev->struct_mutex);
1082                         atomic_dec(&dev->buf_alloc);
1083                         return -ENOMEM;
1084                 }
1085
1086                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1087
1088                 offset += alignment;
1089                 entry->buf_count++;
1090                 byte_count += PAGE_SIZE << page_order;
1091         }
1092
1093         DRM_DEBUG("byte_count: %d\n", byte_count);
1094
1095         temp_buflist = krealloc(dma->buflist,
1096                                 (dma->buf_count + entry->buf_count) *
1097                                 sizeof(*dma->buflist), GFP_KERNEL);
1098         if (!temp_buflist) {
1099                 /* Free the entry because it isn't valid */
1100                 drm_cleanup_buf_error(dev, entry);
1101                 mutex_unlock(&dev->struct_mutex);
1102                 atomic_dec(&dev->buf_alloc);
1103                 return -ENOMEM;
1104         }
1105         dma->buflist = temp_buflist;
1106
1107         for (i = 0; i < entry->buf_count; i++) {
1108                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1109         }
1110
1111         dma->buf_count += entry->buf_count;
1112         dma->seg_count += entry->seg_count;
1113         dma->page_count += byte_count >> PAGE_SHIFT;
1114         dma->byte_count += byte_count;
1115
1116         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1117         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1118
1119         mutex_unlock(&dev->struct_mutex);
1120
1121         request->count = entry->buf_count;
1122         request->size = size;
1123
1124         dma->flags = _DRM_DMA_USE_SG;
1125
1126         atomic_dec(&dev->buf_alloc);
1127         return 0;
1128 }
1129
1130 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1131 {
1132         struct drm_device_dma *dma = dev->dma;
1133         struct drm_buf_entry *entry;
1134         struct drm_buf *buf;
1135         unsigned long offset;
1136         unsigned long agp_offset;
1137         int count;
1138         int order;
1139         int size;
1140         int alignment;
1141         int page_order;
1142         int total;
1143         int byte_count;
1144         int i;
1145         struct drm_buf **temp_buflist;
1146
1147         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1148                 return -EINVAL;
1149
1150         if (!dma)
1151                 return -EINVAL;
1152
1153         if (!capable(CAP_SYS_ADMIN))
1154                 return -EPERM;
1155
1156         count = request->count;
1157         order = drm_order(request->size);
1158         size = 1 << order;
1159
1160         alignment = (request->flags & _DRM_PAGE_ALIGN)
1161             ? PAGE_ALIGN(size) : size;
1162         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1163         total = PAGE_SIZE << page_order;
1164
1165         byte_count = 0;
1166         agp_offset = request->agp_start;
1167
1168         DRM_DEBUG("count:      %d\n", count);
1169         DRM_DEBUG("order:      %d\n", order);
1170         DRM_DEBUG("size:       %d\n", size);
1171         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1172         DRM_DEBUG("alignment:  %d\n", alignment);
1173         DRM_DEBUG("page_order: %d\n", page_order);
1174         DRM_DEBUG("total:      %d\n", total);
1175
1176         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1177                 return -EINVAL;
1178         if (dev->queue_count)
1179                 return -EBUSY;  /* Not while in use */
1180
1181         spin_lock(&dev->count_lock);
1182         if (dev->buf_use) {
1183                 spin_unlock(&dev->count_lock);
1184                 return -EBUSY;
1185         }
1186         atomic_inc(&dev->buf_alloc);
1187         spin_unlock(&dev->count_lock);
1188
1189         mutex_lock(&dev->struct_mutex);
1190         entry = &dma->bufs[order];
1191         if (entry->buf_count) {
1192                 mutex_unlock(&dev->struct_mutex);
1193                 atomic_dec(&dev->buf_alloc);
1194                 return -ENOMEM; /* May only call once for each order */
1195         }
1196
1197         if (count < 0 || count > 4096) {
1198                 mutex_unlock(&dev->struct_mutex);
1199                 atomic_dec(&dev->buf_alloc);
1200                 return -EINVAL;
1201         }
1202
1203         entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1204                                 GFP_KERNEL);
1205         if (!entry->buflist) {
1206                 mutex_unlock(&dev->struct_mutex);
1207                 atomic_dec(&dev->buf_alloc);
1208                 return -ENOMEM;
1209         }
1210
1211         entry->buf_size = size;
1212         entry->page_order = page_order;
1213
1214         offset = 0;
1215
1216         while (entry->buf_count < count) {
1217                 buf = &entry->buflist[entry->buf_count];
1218                 buf->idx = dma->buf_count + entry->buf_count;
1219                 buf->total = alignment;
1220                 buf->order = order;
1221                 buf->used = 0;
1222
1223                 buf->offset = (dma->byte_count + offset);
1224                 buf->bus_address = agp_offset + offset;
1225                 buf->address = (void *)(agp_offset + offset);
1226                 buf->next = NULL;
1227                 buf->waiting = 0;
1228                 buf->pending = 0;
1229                 init_waitqueue_head(&buf->dma_wait);
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 do_mmap(), and copies information
1512  * about each buffer into user space. For PCI buffers, it calls do_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                         down_write(&current->mm->mmap_sem);
1555                         virtual = do_mmap(file_priv->filp, 0, map->size,
1556                                           PROT_READ | PROT_WRITE,
1557                                           MAP_SHARED,
1558                                           token);
1559                         up_write(&current->mm->mmap_sem);
1560                 } else {
1561                         down_write(&current->mm->mmap_sem);
1562                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1563                                           PROT_READ | PROT_WRITE,
1564                                           MAP_SHARED, 0);
1565                         up_write(&current->mm->mmap_sem);
1566                 }
1567                 if (virtual > -1024UL) {
1568                         /* Real error */
1569                         retcode = (signed long)virtual;
1570                         goto done;
1571                 }
1572                 request->virtual = (void __user *)virtual;
1573
1574                 for (i = 0; i < dma->buf_count; i++) {
1575                         if (copy_to_user(&request->list[i].idx,
1576                                          &dma->buflist[i]->idx,
1577                                          sizeof(request->list[0].idx))) {
1578                                 retcode = -EFAULT;
1579                                 goto done;
1580                         }
1581                         if (copy_to_user(&request->list[i].total,
1582                                          &dma->buflist[i]->total,
1583                                          sizeof(request->list[0].total))) {
1584                                 retcode = -EFAULT;
1585                                 goto done;
1586                         }
1587                         if (copy_to_user(&request->list[i].used,
1588                                          &zero, sizeof(zero))) {
1589                                 retcode = -EFAULT;
1590                                 goto done;
1591                         }
1592                         address = virtual + dma->buflist[i]->offset;    /* *** */
1593                         if (copy_to_user(&request->list[i].address,
1594                                          &address, sizeof(address))) {
1595                                 retcode = -EFAULT;
1596                                 goto done;
1597                         }
1598                 }
1599         }
1600       done:
1601         request->count = dma->buf_count;
1602         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1603
1604         return retcode;
1605 }
1606
1607 /**
1608  * Compute size order.  Returns the exponent of the smaller power of two which
1609  * is greater or equal to given number.
1610  *
1611  * \param size size.
1612  * \return order.
1613  *
1614  * \todo Can be made faster.
1615  */
1616 int drm_order(unsigned long size)
1617 {
1618         int order;
1619         unsigned long tmp;
1620
1621         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1622
1623         if (size & (size - 1))
1624                 ++order;
1625
1626         return order;
1627 }
1628 EXPORT_SYMBOL(drm_order);