SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 resource_size_t drm_get_resource_start(struct drm_device *dev, unsigned int resource)
  43 {
  44         return pci_resource_start(dev->pdev, resource);
  45 }
  46 EXPORT_SYMBOL(drm_get_resource_start);
  47
  48 resource_size_t drm_get_resource_len(struct drm_device *dev, unsigned int resource)
  49 {
  50         return pci_resource_len(dev->pdev, resource);
  51 }
  52
  53 EXPORT_SYMBOL(drm_get_resource_len);
  54
  55 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  56                                                   struct drm_local_map *map)
  57 {
  58         struct drm_map_list *entry;
  59         list_for_each_entry(entry, &dev->maplist, head) {
  60                 /*
  61                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  62                  * while PCI resources may live above that, we ignore the map
  63                  * offset for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  64                  * It is assumed that each driver will have only one resource of
  65                  * each type.
  66                  */
  67                 if (!entry->map ||
  68                     map->type != entry->map->type ||
  69                     entry->master != dev->primary->master)
  70                         continue;
  71                 switch (map->type) {
  72                 case _DRM_SHM:
  73                         if (map->flags != _DRM_CONTAINS_LOCK)
  74                                 break;
  75                 case _DRM_REGISTERS:
  76                 case _DRM_FRAME_BUFFER:
  77                         return entry;
  78                 default: /* Make gcc happy */
  79                         ;
  80                 }
  81                 if (entry->map->offset == map->offset)
  82                         return entry;
  83         }
  84
  85         return NULL;
  86 }
  87
  88 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  89                           unsigned long user_token, int hashed_handle, int shm)
  90 {
  91         int use_hashed_handle, shift;
  92         unsigned long add;
  93
  94 #if (BITS_PER_LONG == 64)
  95         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  96 #elif (BITS_PER_LONG == 32)
  97         use_hashed_handle = hashed_handle;
  98 #else
  99 #error Unsupported long size. Neither 64 nor 32 bits.
 100 #endif
 101
 102         if (!use_hashed_handle) {
 103                 int ret;
 104                 hash->key = user_token >> PAGE_SHIFT;
 105                 ret = drm_ht_insert_item(&dev->map_hash, hash);
 106                 if (ret != -EINVAL)
 107                         return ret;
 108         }
 109
 110         shift = 0;
 111         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 112         if (shm && (SHMLBA > PAGE_SIZE)) {
 113                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 114
 115                 /* For shared memory, we have to preserve the SHMLBA
 116                  * bits of the eventual vma->vm_pgoff value during
 117                  * mmap().  Otherwise we run into cache aliasing problems
 118                  * on some platforms.  On these platforms, the pgoff of
 119                  * a mmap() request is used to pick a suitable virtual
 120                  * address for the mmap() region such that it will not
 121                  * cause cache aliasing problems.
 122                  *
 123                  * Therefore, make sure the SHMLBA relevant bits of the
 124                  * hash value we use are equal to those in the original
 125                  * kernel virtual address.
 126                  */
 127                 shift = bits;
 128                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 129         }
 130
 131         return drm_ht_just_insert_please(&dev->map_hash, hash,
 132                                          user_token, 32 - PAGE_SHIFT - 3,
 133                                          shift, add);
 134 }
 135
 136 /**
 137  * Core function to create a range of memory available for mapping by a
 138  * non-root process.
 139  *
 140  * Adjusts the memory offset to its absolute value according to the mapping
 141  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 142  * applicable and if supported by the kernel.
 143  */
 144 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 145                            unsigned int size, enum drm_map_type type,
 146                            enum drm_map_flags flags,
 147                            struct drm_map_list ** maplist)
 148 {
 149         struct drm_local_map *map;
 150         struct drm_map_list *list;
 151         drm_dma_handle_t *dmah;
 152         unsigned long user_token;
 153         int ret;
 154
 155         map = kmalloc(sizeof(*map), GFP_KERNEL);
 156         if (!map)
 157                 return -ENOMEM;
 158
 159         map->offset = offset;
 160         map->size = size;
 161         map->flags = flags;
 162         map->type = type;
 163
 164         /* Only allow shared memory to be removable since we only keep enough
 165          * book keeping information about shared memory to allow for removal
 166          * when processes fork.
 167          */
 168         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 169                 kfree(map);
 170                 return -EINVAL;
 171         }
 172         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 173                   (unsigned long long)map->offset, map->size, map->type);
 174
 175         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 176          * hole created by that and it works around various broken drivers that use
 177          * a non-aligned quantity to map the SAREA. --BenH
 178          */
 179         if (map->type == _DRM_SHM)
 180                 map->size = PAGE_ALIGN(map->size);
 181
 182         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 183                 kfree(map);
 184                 return -EINVAL;
 185         }
 186         map->mtrr = -1;
 187         map->handle = NULL;
 188
 189         switch (map->type) {
 190         case _DRM_REGISTERS:
 191         case _DRM_FRAME_BUFFER:
 192 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 193                 if (map->offset + (map->size-1) < map->offset ||
 194                     map->offset < virt_to_phys(high_memory)) {
 195                         kfree(map);
 196                         return -EINVAL;
 197                 }
 198 #endif
 199 #ifdef __alpha__
 200                 map->offset += dev->hose->mem_space->start;
 201 #endif
 202                 /* Some drivers preinitialize some maps, without the X Server
 203                  * needing to be aware of it.  Therefore, we just return success
 204                  * when the server tries to create a duplicate map.
 205                  */
 206                 list = drm_find_matching_map(dev, map);
 207                 if (list != NULL) {
 208                         if (list->map->size != map->size) {
 209                                 DRM_DEBUG("Matching maps of type %d with "
 210                                           "mismatched sizes, (%ld vs %ld)\n",
 211                                           map->type, map->size,
 212                                           list->map->size);
 213                                 list->map->size = map->size;
 214                         }
 215
 216                         kfree(map);
 217                         *maplist = list;
 218                         return 0;
 219                 }
 220
 221                 if (drm_core_has_MTRR(dev)) {
 222                         if (map->type == _DRM_FRAME_BUFFER ||
 223                             (map->flags & _DRM_WRITE_COMBINING)) {
 224                                 map->mtrr = mtrr_add(map->offset, map->size,
 225                                                      MTRR_TYPE_WRCOMB, 1);
 226                         }
 227                 }
 228                 if (map->type == _DRM_REGISTERS) {
 229                         map->handle = ioremap(map->offset, map->size);
 230                         if (!map->handle) {
 231                                 kfree(map);
 232                                 return -ENOMEM;
 233                         }
 234                 }
 235
 236                 break;
 237         case _DRM_SHM:
 238                 list = drm_find_matching_map(dev, map);
 239                 if (list != NULL) {
 240                         if(list->map->size != map->size) {
 241                                 DRM_DEBUG("Matching maps of type %d with "
 242                                           "mismatched sizes, (%ld vs %ld)\n",
 243                                           map->type, map->size, list->map->size);
 244                                 list->map->size = map->size;
 245                         }
 246
 247                         kfree(map);
 248                         *maplist = list;
 249                         return 0;
 250                 }
 251                 map->handle = vmalloc_user(map->size);
 252                 DRM_DEBUG("%lu %d %p\n",
 253                           map->size, drm_order(map->size), map->handle);
 254                 if (!map->handle) {
 255                         kfree(map);
 256                         return -ENOMEM;
 257                 }
 258                 map->offset = (unsigned long)map->handle;
 259                 if (map->flags & _DRM_CONTAINS_LOCK) {
 260                         /* Prevent a 2nd X Server from creating a 2nd lock */
 261                         if (dev->primary->master->lock.hw_lock != NULL) {
 262                                 vfree(map->handle);
 263                                 kfree(map);
 264                                 return -EBUSY;
 265                         }
 266                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 267                 }
 268                 break;
 269         case _DRM_AGP: {
 270                 struct drm_agp_mem *entry;
 271                 int valid = 0;
 272
 273                 if (!drm_core_has_AGP(dev)) {
 274                         kfree(map);
 275                         return -EINVAL;
 276                 }
 277 #ifdef __alpha__
 278                 map->offset += dev->hose->mem_space->start;
 279 #endif
 280                 /* In some cases (i810 driver), user space may have already
 281                  * added the AGP base itself, because dev->agp->base previously
 282                  * only got set during AGP enable.  So, only add the base
 283                  * address if the map's offset isn't already within the
 284                  * aperture.
 285                  */
 286                 if (map->offset < dev->agp->base ||
 287                     map->offset > dev->agp->base +
 288                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 289                         map->offset += dev->agp->base;
 290                 }
 291                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 292
 293                 /* This assumes the DRM is in total control of AGP space.
 294                  * It's not always the case as AGP can be in the control
 295                  * of user space (i.e. i810 driver). So this loop will get
 296                  * skipped and we double check that dev->agp->memory is
 297                  * actually set as well as being invalid before EPERM'ing
 298                  */
 299                 list_for_each_entry(entry, &dev->agp->memory, head) {
 300                         if ((map->offset >= entry->bound) &&
 301                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 302                                 valid = 1;
 303                                 break;
 304                         }
 305                 }
 306                 if (!list_empty(&dev->agp->memory) && !valid) {
 307                         kfree(map);
 308                         return -EPERM;
 309                 }
 310                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 311                           (unsigned long long)map->offset, map->size);
 312
 313                 break;
 314         }
 315         case _DRM_GEM:
 316                 DRM_ERROR("tried to addmap GEM object\n");
 317                 break;
 318         case _DRM_SCATTER_GATHER:
 319                 if (!dev->sg) {
 320                         kfree(map);
 321                         return -EINVAL;
 322                 }
 323                 map->offset += (unsigned long)dev->sg->virtual;
 324                 break;
 325         case _DRM_CONSISTENT:
 326                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 327                  * As we're limiting the address to 2^32-1 (or less),
 328                  * casting it down to 32 bits is no problem, but we
 329                  * need to point to a 64bit variable first. */
 330                 dmah = drm_pci_alloc(dev, map->size, map->size);
 331                 if (!dmah) {
 332                         kfree(map);
 333                         return -ENOMEM;
 334                 }
 335                 map->handle = dmah->vaddr;
 336                 map->offset = (unsigned long)dmah->busaddr;
 337                 kfree(dmah);
 338                 break;
 339         default:
 340                 kfree(map);
 341                 return -EINVAL;
 342         }
 343
 344         list = kmalloc(sizeof(*list), GFP_KERNEL);
 345         if (!list) {
 346                 if (map->type == _DRM_REGISTERS)
 347                         iounmap(map->handle);
 348                 kfree(map);
 349                 return -EINVAL;
 350         }
 351         memset(list, 0, sizeof(*list));
 352         list->map = map;
 353
 354         mutex_lock(&dev->struct_mutex);
 355         list_add(&list->head, &dev->maplist);
 356
 357         /* Assign a 32-bit handle */
 358         /* We do it here so that dev->struct_mutex protects the increment */
 359         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 360                 map->offset;
 361         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 362                              (map->type == _DRM_SHM));
 363         if (ret) {
 364                 if (map->type == _DRM_REGISTERS)
 365                         iounmap(map->handle);
 366                 kfree(map);
 367                 kfree(list);
 368                 mutex_unlock(&dev->struct_mutex);
 369                 return ret;
 370         }
 371
 372         list->user_token = list->hash.key << PAGE_SHIFT;
 373         mutex_unlock(&dev->struct_mutex);
 374
 375         if (!(map->flags & _DRM_DRIVER))
 376                 list->master = dev->primary->master;
 377         *maplist = list;
 378         return 0;
 379         }
 380
 381 int drm_addmap(struct drm_device * dev, resource_size_t offset,
 382                unsigned int size, enum drm_map_type type,
 383                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 384 {
 385         struct drm_map_list *list;
 386         int rc;
 387
 388         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 389         if (!rc)
 390                 *map_ptr = list->map;
 391         return rc;
 392 }
 393
 394 EXPORT_SYMBOL(drm_addmap);
 395
 396 /**
 397  * Ioctl to specify a range of memory that is available for mapping by a
 398  * non-root process.
 399  *
 400  * \param inode device inode.
 401  * \param file_priv DRM file private.
 402  * \param cmd command.
 403  * \param arg pointer to a drm_map structure.
 404  * \return zero on success or a negative value on error.
 405  *
 406  */
 407 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 408                      struct drm_file *file_priv)
 409 {
 410         struct drm_map *map = data;
 411         struct drm_map_list *maplist;
 412         int err;
 413
 414         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 415                 return -EPERM;
 416
 417         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 418                               map->flags, &maplist);
 419
 420         if (err)
 421                 return err;
 422
 423         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 424         map->handle = (void *)(unsigned long)maplist->user_token;
 425         return 0;
 426 }
 427
 428 /**
 429  * Remove a map private from list and deallocate resources if the mapping
 430  * isn't in use.
 431  *
 432  * Searches the map on drm_device::maplist, removes it from the list, see if
 433  * its being used, and free any associate resource (such as MTRR's) if it's not
 434  * being on use.
 435  *
 436  * \sa drm_addmap
 437  */
 438 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 439 {
 440         struct drm_map_list *r_list = NULL, *list_t;
 441         drm_dma_handle_t dmah;
 442         int found = 0;
 443         struct drm_master *master;
 444
 445         /* Find the list entry for the map and remove it */
 446         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 447                 if (r_list->map == map) {
 448                         master = r_list->master;
 449                         list_del(&r_list->head);
 450                         drm_ht_remove_key(&dev->map_hash,
 451                                           r_list->user_token >> PAGE_SHIFT);
 452                         kfree(r_list);
 453                         found = 1;
 454                         break;
 455                 }
 456         }
 457
 458         if (!found)
 459                 return -EINVAL;
 460
 461         switch (map->type) {
 462         case _DRM_REGISTERS:
 463                 iounmap(map->handle);
 464                 /* FALLTHROUGH */
 465         case _DRM_FRAME_BUFFER:
 466                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 467                         int retcode;
 468                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 469                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 470                 }
 471                 break;
 472         case _DRM_SHM:
 473                 vfree(map->handle);
 474                 if (master) {
 475                         if (dev->sigdata.lock == master->lock.hw_lock)
 476                                 dev->sigdata.lock = NULL;
 477                         master->lock.hw_lock = NULL;   /* SHM removed */
 478                         master->lock.file_priv = NULL;
 479                         wake_up_interruptible_all(&master->lock.lock_queue);
 480                 }
 481                 break;
 482         case _DRM_AGP:
 483         case _DRM_SCATTER_GATHER:
 484                 break;
 485         case _DRM_CONSISTENT:
 486                 dmah.vaddr = map->handle;
 487                 dmah.busaddr = map->offset;
 488                 dmah.size = map->size;
 489                 __drm_pci_free(dev, &dmah);
 490                 break;
 491         case _DRM_GEM:
 492                 DRM_ERROR("tried to rmmap GEM object\n");
 493                 break;
 494         }
 495         kfree(map);
 496
 497         return 0;
 498 }
 499 EXPORT_SYMBOL(drm_rmmap_locked);
 500
 501 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 502 {
 503         int ret;
 504
 505         mutex_lock(&dev->struct_mutex);
 506         ret = drm_rmmap_locked(dev, map);
 507         mutex_unlock(&dev->struct_mutex);
 508
 509         return ret;
 510 }
 511 EXPORT_SYMBOL(drm_rmmap);
 512
 513 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 514  * the last close of the device, and this is necessary for cleanup when things
 515  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 516  * like a pointless exercise since they're going away anyway.
 517  *
 518  * One use case might be after addmap is allowed for normal users for SHM and
 519  * gets used by drivers that the server doesn't need to care about.  This seems
 520  * unlikely.
 521  *
 522  * \param inode device inode.
 523  * \param file_priv DRM file private.
 524  * \param cmd command.
 525  * \param arg pointer to a struct drm_map structure.
 526  * \return zero on success or a negative value on error.
 527  */
 528 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 529                     struct drm_file *file_priv)
 530 {
 531         struct drm_map *request = data;
 532         struct drm_local_map *map = NULL;
 533         struct drm_map_list *r_list;
 534         int ret;
 535
 536         mutex_lock(&dev->struct_mutex);
 537         list_for_each_entry(r_list, &dev->maplist, head) {
 538                 if (r_list->map &&
 539                     r_list->user_token == (unsigned long)request->handle &&
 540                     r_list->map->flags & _DRM_REMOVABLE) {
 541                         map = r_list->map;
 542                         break;
 543                 }
 544         }
 545
 546         /* List has wrapped around to the head pointer, or its empty we didn't
 547          * find anything.
 548          */
 549         if (list_empty(&dev->maplist) || !map) {
 550                 mutex_unlock(&dev->struct_mutex);
 551                 return -EINVAL;
 552         }
 553
 554         /* Register and framebuffer maps are permanent */
 555         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 556                 mutex_unlock(&dev->struct_mutex);
 557                 return 0;
 558         }
 559
 560         ret = drm_rmmap_locked(dev, map);
 561
 562         mutex_unlock(&dev->struct_mutex);
 563
 564         return ret;
 565 }
 566
 567 /**
 568  * Cleanup after an error on one of the addbufs() functions.
 569  *
 570  * \param dev DRM device.
 571  * \param entry buffer entry where the error occurred.
 572  *
 573  * Frees any pages and buffers associated with the given entry.
 574  */
 575 static void drm_cleanup_buf_error(struct drm_device * dev,
 576                                   struct drm_buf_entry * entry)
 577 {
 578         int i;
 579
 580         if (entry->seg_count) {
 581                 for (i = 0; i < entry->seg_count; i++) {
 582                         if (entry->seglist[i]) {
 583                                 drm_pci_free(dev, entry->seglist[i]);
 584                         }
 585                 }
 586                 kfree(entry->seglist);
 587
 588                 entry->seg_count = 0;
 589         }
 590
 591         if (entry->buf_count) {
 592                 for (i = 0; i < entry->buf_count; i++) {
 593                         kfree(entry->buflist[i].dev_private);
 594                 }
 595                 kfree(entry->buflist);
 596
 597                 entry->buf_count = 0;
 598         }
 599 }
 600
 601 #if __OS_HAS_AGP
 602 /**
 603  * Add AGP buffers for DMA transfers.
 604  *
 605  * \param dev struct drm_device to which the buffers are to be added.
 606  * \param request pointer to a struct drm_buf_desc describing the request.
 607  * \return zero on success or a negative number on failure.
 608  *
 609  * After some sanity checks creates a drm_buf structure for each buffer and
 610  * reallocates the buffer list of the same size order to accommodate the new
 611  * buffers.
 612  */
 613 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 614 {
 615         struct drm_device_dma *dma = dev->dma;
 616         struct drm_buf_entry *entry;
 617         struct drm_agp_mem *agp_entry;
 618         struct drm_buf *buf;
 619         unsigned long offset;
 620         unsigned long agp_offset;
 621         int count;
 622         int order;
 623         int size;
 624         int alignment;
 625         int page_order;
 626         int total;
 627         int byte_count;
 628         int i, valid;
 629         struct drm_buf **temp_buflist;
 630
 631         if (!dma)
 632                 return -EINVAL;
 633
 634         count = request->count;
 635         order = drm_order(request->size);
 636         size = 1 << order;
 637
 638         alignment = (request->flags & _DRM_PAGE_ALIGN)
 639             ? PAGE_ALIGN(size) : size;
 640         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 641         total = PAGE_SIZE << page_order;
 642
 643         byte_count = 0;
 644         agp_offset = dev->agp->base + request->agp_start;
 645
 646         DRM_DEBUG("count:      %d\n", count);
 647         DRM_DEBUG("order:      %d\n", order);
 648         DRM_DEBUG("size:       %d\n", size);
 649         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 650         DRM_DEBUG("alignment:  %d\n", alignment);
 651         DRM_DEBUG("page_order: %d\n", page_order);
 652         DRM_DEBUG("total:      %d\n", total);
 653
 654         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 655                 return -EINVAL;
 656         if (dev->queue_count)
 657                 return -EBUSY;  /* Not while in use */
 658
 659         /* Make sure buffers are located in AGP memory that we own */
 660         valid = 0;
 661         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 662                 if ((agp_offset >= agp_entry->bound) &&
 663                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 664                         valid = 1;
 665                         break;
 666                 }
 667         }
 668         if (!list_empty(&dev->agp->memory) && !valid) {
 669                 DRM_DEBUG("zone invalid\n");
 670                 return -EINVAL;
 671         }
 672         spin_lock(&dev->count_lock);
 673         if (dev->buf_use) {
 674                 spin_unlock(&dev->count_lock);
 675                 return -EBUSY;
 676         }
 677         atomic_inc(&dev->buf_alloc);
 678         spin_unlock(&dev->count_lock);
 679
 680         mutex_lock(&dev->struct_mutex);
 681         entry = &dma->bufs[order];
 682         if (entry->buf_count) {
 683                 mutex_unlock(&dev->struct_mutex);
 684                 atomic_dec(&dev->buf_alloc);
 685                 return -ENOMEM; /* May only call once for each order */
 686         }
 687
 688         if (count < 0 || count > 4096) {
 689                 mutex_unlock(&dev->struct_mutex);
 690                 atomic_dec(&dev->buf_alloc);
 691                 return -EINVAL;
 692         }
 693
 694         entry->buflist = kmalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 695         if (!entry->buflist) {
 696                 mutex_unlock(&dev->struct_mutex);
 697                 atomic_dec(&dev->buf_alloc);
 698                 return -ENOMEM;
 699         }
 700         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 701
 702         entry->buf_size = size;
 703         entry->page_order = page_order;
 704
 705         offset = 0;
 706
 707         while (entry->buf_count < count) {
 708                 buf = &entry->buflist[entry->buf_count];
 709                 buf->idx = dma->buf_count + entry->buf_count;
 710                 buf->total = alignment;
 711                 buf->order = order;
 712                 buf->used = 0;
 713
 714                 buf->offset = (dma->byte_count + offset);
 715                 buf->bus_address = agp_offset + offset;
 716                 buf->address = (void *)(agp_offset + offset);
 717                 buf->next = NULL;
 718                 buf->waiting = 0;
 719                 buf->pending = 0;
 720                 init_waitqueue_head(&buf->dma_wait);
 721                 buf->file_priv = NULL;
 722
 723                 buf->dev_priv_size = dev->driver->dev_priv_size;
 724                 buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL);
 725                 if (!buf->dev_private) {
 726                         /* Set count correctly so we free the proper amount. */
 727                         entry->buf_count = count;
 728                         drm_cleanup_buf_error(dev, entry);
 729                         mutex_unlock(&dev->struct_mutex);
 730                         atomic_dec(&dev->buf_alloc);
 731                         return -ENOMEM;
 732                 }
 733                 memset(buf->dev_private, 0, buf->dev_priv_size);
 734
 735                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 736
 737                 offset += alignment;
 738                 entry->buf_count++;
 739                 byte_count += PAGE_SIZE << page_order;
 740         }
 741
 742         DRM_DEBUG("byte_count: %d\n", byte_count);
 743
 744         temp_buflist = krealloc(dma->buflist,
 745                                 (dma->buf_count + entry->buf_count) *
 746                                 sizeof(*dma->buflist), GFP_KERNEL);
 747         if (!temp_buflist) {
 748                 /* Free the entry because it isn't valid */
 749                 drm_cleanup_buf_error(dev, entry);
 750                 mutex_unlock(&dev->struct_mutex);
 751                 atomic_dec(&dev->buf_alloc);
 752                 return -ENOMEM;
 753         }
 754         dma->buflist = temp_buflist;
 755
 756         for (i = 0; i < entry->buf_count; i++) {
 757                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 758         }
 759
 760         dma->buf_count += entry->buf_count;
 761         dma->seg_count += entry->seg_count;
 762         dma->page_count += byte_count >> PAGE_SHIFT;
 763         dma->byte_count += byte_count;
 764
 765         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 766         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 767
 768         mutex_unlock(&dev->struct_mutex);
 769
 770         request->count = entry->buf_count;
 771         request->size = size;
 772
 773         dma->flags = _DRM_DMA_USE_AGP;
 774
 775         atomic_dec(&dev->buf_alloc);
 776         return 0;
 777 }
 778 EXPORT_SYMBOL(drm_addbufs_agp);
 779 #endif                          /* __OS_HAS_AGP */
 780
 781 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 782 {
 783         struct drm_device_dma *dma = dev->dma;
 784         int count;
 785         int order;
 786         int size;
 787         int total;
 788         int page_order;
 789         struct drm_buf_entry *entry;
 790         drm_dma_handle_t *dmah;
 791         struct drm_buf *buf;
 792         int alignment;
 793         unsigned long offset;
 794         int i;
 795         int byte_count;
 796         int page_count;
 797         unsigned long *temp_pagelist;
 798         struct drm_buf **temp_buflist;
 799
 800         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 801                 return -EINVAL;
 802
 803         if (!dma)
 804                 return -EINVAL;
 805
 806         if (!capable(CAP_SYS_ADMIN))
 807                 return -EPERM;
 808
 809         count = request->count;
 810         order = drm_order(request->size);
 811         size = 1 << order;
 812
 813         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 814                   request->count, request->size, size, order, dev->queue_count);
 815
 816         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 817                 return -EINVAL;
 818         if (dev->queue_count)
 819                 return -EBUSY;  /* Not while in use */
 820
 821         alignment = (request->flags & _DRM_PAGE_ALIGN)
 822             ? PAGE_ALIGN(size) : size;
 823         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 824         total = PAGE_SIZE << page_order;
 825
 826         spin_lock(&dev->count_lock);
 827         if (dev->buf_use) {
 828                 spin_unlock(&dev->count_lock);
 829                 return -EBUSY;
 830         }
 831         atomic_inc(&dev->buf_alloc);
 832         spin_unlock(&dev->count_lock);
 833
 834         mutex_lock(&dev->struct_mutex);
 835         entry = &dma->bufs[order];
 836         if (entry->buf_count) {
 837                 mutex_unlock(&dev->struct_mutex);
 838                 atomic_dec(&dev->buf_alloc);
 839                 return -ENOMEM; /* May only call once for each order */
 840         }
 841
 842         if (count < 0 || count > 4096) {
 843                 mutex_unlock(&dev->struct_mutex);
 844                 atomic_dec(&dev->buf_alloc);
 845                 return -EINVAL;
 846         }
 847
 848         entry->buflist = kmalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 849         if (!entry->buflist) {
 850                 mutex_unlock(&dev->struct_mutex);
 851                 atomic_dec(&dev->buf_alloc);
 852                 return -ENOMEM;
 853         }
 854         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 855
 856         entry->seglist = kmalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
 857         if (!entry->seglist) {
 858                 kfree(entry->buflist);
 859                 mutex_unlock(&dev->struct_mutex);
 860                 atomic_dec(&dev->buf_alloc);
 861                 return -ENOMEM;
 862         }
 863         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 864
 865         /* Keep the original pagelist until we know all the allocations
 866          * have succeeded
 867          */
 868         temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
 869                                sizeof(*dma->pagelist), GFP_KERNEL);
 870         if (!temp_pagelist) {
 871                 kfree(entry->buflist);
 872                 kfree(entry->seglist);
 873                 mutex_unlock(&dev->struct_mutex);
 874                 atomic_dec(&dev->buf_alloc);
 875                 return -ENOMEM;
 876         }
 877         memcpy(temp_pagelist,
 878                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 879         DRM_DEBUG("pagelist: %d entries\n",
 880                   dma->page_count + (count << page_order));
 881
 882         entry->buf_size = size;
 883         entry->page_order = page_order;
 884         byte_count = 0;
 885         page_count = 0;
 886
 887         while (entry->buf_count < count) {
 888
 889                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 890
 891                 if (!dmah) {
 892                         /* Set count correctly so we free the proper amount. */
 893                         entry->buf_count = count;
 894                         entry->seg_count = count;
 895                         drm_cleanup_buf_error(dev, entry);
 896                         kfree(temp_pagelist);
 897                         mutex_unlock(&dev->struct_mutex);
 898                         atomic_dec(&dev->buf_alloc);
 899                         return -ENOMEM;
 900                 }
 901                 entry->seglist[entry->seg_count++] = dmah;
 902                 for (i = 0; i < (1 << page_order); i++) {
 903                         DRM_DEBUG("page %d @ 0x%08lx\n",
 904                                   dma->page_count + page_count,
 905                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 906                         temp_pagelist[dma->page_count + page_count++]
 907                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 908                 }
 909                 for (offset = 0;
 910                      offset + size <= total && entry->buf_count < count;
 911                      offset += alignment, ++entry->buf_count) {
 912                         buf = &entry->buflist[entry->buf_count];
 913                         buf->idx = dma->buf_count + entry->buf_count;
 914                         buf->total = alignment;
 915                         buf->order = order;
 916                         buf->used = 0;
 917                         buf->offset = (dma->byte_count + byte_count + offset);
 918                         buf->address = (void *)(dmah->vaddr + offset);
 919                         buf->bus_address = dmah->busaddr + offset;
 920                         buf->next = NULL;
 921                         buf->waiting = 0;
 922                         buf->pending = 0;
 923                         init_waitqueue_head(&buf->dma_wait);
 924                         buf->file_priv = NULL;
 925
 926                         buf->dev_priv_size = dev->driver->dev_priv_size;
 927                         buf->dev_private = kmalloc(buf->dev_priv_size,
 928                                                   GFP_KERNEL);
 929                         if (!buf->dev_private) {
 930                                 /* Set count correctly so we free the proper amount. */
 931                                 entry->buf_count = count;
 932                                 entry->seg_count = count;
 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                         memset(buf->dev_private, 0, buf->dev_priv_size);
 940
 941                         DRM_DEBUG("buffer %d @ %p\n",
 942                                   entry->buf_count, buf->address);
 943                 }
 944                 byte_count += PAGE_SIZE << page_order;
 945         }
 946
 947         temp_buflist = krealloc(dma->buflist,
 948                                 (dma->buf_count + entry->buf_count) *
 949                                 sizeof(*dma->buflist), GFP_KERNEL);
 950         if (!temp_buflist) {
 951                 /* Free the entry because it isn't valid */
 952                 drm_cleanup_buf_error(dev, entry);
 953                 kfree(temp_pagelist);
 954                 mutex_unlock(&dev->struct_mutex);
 955                 atomic_dec(&dev->buf_alloc);
 956                 return -ENOMEM;
 957         }
 958         dma->buflist = temp_buflist;
 959
 960         for (i = 0; i < entry->buf_count; i++) {
 961                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 962         }
 963
 964         /* No allocations failed, so now we can replace the original pagelist
 965          * with the new one.
 966          */
 967         if (dma->page_count) {
 968                 kfree(dma->pagelist);
 969         }
 970         dma->pagelist = temp_pagelist;
 971
 972         dma->buf_count += entry->buf_count;
 973         dma->seg_count += entry->seg_count;
 974         dma->page_count += entry->seg_count << page_order;
 975         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 976
 977         mutex_unlock(&dev->struct_mutex);
 978
 979         request->count = entry->buf_count;
 980         request->size = size;
 981
 982         if (request->flags & _DRM_PCI_BUFFER_RO)
 983                 dma->flags = _DRM_DMA_USE_PCI_RO;
 984
 985         atomic_dec(&dev->buf_alloc);
 986         return 0;
 987
 988 }
 989 EXPORT_SYMBOL(drm_addbufs_pci);
 990
 991 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 992 {
 993         struct drm_device_dma *dma = dev->dma;
 994         struct drm_buf_entry *entry;
 995         struct drm_buf *buf;
 996         unsigned long offset;
 997         unsigned long agp_offset;
 998         int count;
 999         int order;
1000         int size;
1001         int alignment;
1002         int page_order;
1003         int total;
1004         int byte_count;
1005         int i;
1006         struct drm_buf **temp_buflist;
1007
1008         if (!drm_core_check_feature(dev, DRIVER_SG))
1009                 return -EINVAL;
1010
1011         if (!dma)
1012                 return -EINVAL;
1013
1014         if (!capable(CAP_SYS_ADMIN))
1015                 return -EPERM;
1016
1017         count = request->count;
1018         order = drm_order(request->size);
1019         size = 1 << order;
1020
1021         alignment = (request->flags & _DRM_PAGE_ALIGN)
1022             ? PAGE_ALIGN(size) : size;
1023         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1024         total = PAGE_SIZE << page_order;
1025
1026         byte_count = 0;
1027         agp_offset = request->agp_start;
1028
1029         DRM_DEBUG("count:      %d\n", count);
1030         DRM_DEBUG("order:      %d\n", order);
1031         DRM_DEBUG("size:       %d\n", size);
1032         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1033         DRM_DEBUG("alignment:  %d\n", alignment);
1034         DRM_DEBUG("page_order: %d\n", page_order);
1035         DRM_DEBUG("total:      %d\n", total);
1036
1037         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1038                 return -EINVAL;
1039         if (dev->queue_count)
1040                 return -EBUSY;  /* Not while in use */
1041
1042         spin_lock(&dev->count_lock);
1043         if (dev->buf_use) {
1044                 spin_unlock(&dev->count_lock);
1045                 return -EBUSY;
1046         }
1047         atomic_inc(&dev->buf_alloc);
1048         spin_unlock(&dev->count_lock);
1049
1050         mutex_lock(&dev->struct_mutex);
1051         entry = &dma->bufs[order];
1052         if (entry->buf_count) {
1053                 mutex_unlock(&dev->struct_mutex);
1054                 atomic_dec(&dev->buf_alloc);
1055                 return -ENOMEM; /* May only call once for each order */
1056         }
1057
1058         if (count < 0 || count > 4096) {
1059                 mutex_unlock(&dev->struct_mutex);
1060                 atomic_dec(&dev->buf_alloc);
1061                 return -EINVAL;
1062         }
1063
1064         entry->buflist = kmalloc(count * sizeof(*entry->buflist),
1065                                 GFP_KERNEL);
1066         if (!entry->buflist) {
1067                 mutex_unlock(&dev->struct_mutex);
1068                 atomic_dec(&dev->buf_alloc);
1069                 return -ENOMEM;
1070         }
1071         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1072
1073         entry->buf_size = size;
1074         entry->page_order = page_order;
1075
1076         offset = 0;
1077
1078         while (entry->buf_count < count) {
1079                 buf = &entry->buflist[entry->buf_count];
1080                 buf->idx = dma->buf_count + entry->buf_count;
1081                 buf->total = alignment;
1082                 buf->order = order;
1083                 buf->used = 0;
1084
1085                 buf->offset = (dma->byte_count + offset);
1086                 buf->bus_address = agp_offset + offset;
1087                 buf->address = (void *)(agp_offset + offset
1088                                         + (unsigned long)dev->sg->virtual);
1089                 buf->next = NULL;
1090                 buf->waiting = 0;
1091                 buf->pending = 0;
1092                 init_waitqueue_head(&buf->dma_wait);
1093                 buf->file_priv = NULL;
1094
1095                 buf->dev_priv_size = dev->driver->dev_priv_size;
1096                 buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL);
1097                 if (!buf->dev_private) {
1098                         /* Set count correctly so we free the proper amount. */
1099                         entry->buf_count = count;
1100                         drm_cleanup_buf_error(dev, entry);
1101                         mutex_unlock(&dev->struct_mutex);
1102                         atomic_dec(&dev->buf_alloc);
1103                         return -ENOMEM;
1104                 }
1105
1106                 memset(buf->dev_private, 0, buf->dev_priv_size);
1107
1108                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1109
1110                 offset += alignment;
1111                 entry->buf_count++;
1112                 byte_count += PAGE_SIZE << page_order;
1113         }
1114
1115         DRM_DEBUG("byte_count: %d\n", byte_count);
1116
1117         temp_buflist = krealloc(dma->buflist,
1118                                 (dma->buf_count + entry->buf_count) *
1119                                 sizeof(*dma->buflist), GFP_KERNEL);
1120         if (!temp_buflist) {
1121                 /* Free the entry because it isn't valid */
1122                 drm_cleanup_buf_error(dev, entry);
1123                 mutex_unlock(&dev->struct_mutex);
1124                 atomic_dec(&dev->buf_alloc);
1125                 return -ENOMEM;
1126         }
1127         dma->buflist = temp_buflist;
1128
1129         for (i = 0; i < entry->buf_count; i++) {
1130                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1131         }
1132
1133         dma->buf_count += entry->buf_count;
1134         dma->seg_count += entry->seg_count;
1135         dma->page_count += byte_count >> PAGE_SHIFT;
1136         dma->byte_count += byte_count;
1137
1138         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1139         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1140
1141         mutex_unlock(&dev->struct_mutex);
1142
1143         request->count = entry->buf_count;
1144         request->size = size;
1145
1146         dma->flags = _DRM_DMA_USE_SG;
1147
1148         atomic_dec(&dev->buf_alloc);
1149         return 0;
1150 }
1151
1152 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1153 {
1154         struct drm_device_dma *dma = dev->dma;
1155         struct drm_buf_entry *entry;
1156         struct drm_buf *buf;
1157         unsigned long offset;
1158         unsigned long agp_offset;
1159         int count;
1160         int order;
1161         int size;
1162         int alignment;
1163         int page_order;
1164         int total;
1165         int byte_count;
1166         int i;
1167         struct drm_buf **temp_buflist;
1168
1169         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1170                 return -EINVAL;
1171
1172         if (!dma)
1173                 return -EINVAL;
1174
1175         if (!capable(CAP_SYS_ADMIN))
1176                 return -EPERM;
1177
1178         count = request->count;
1179         order = drm_order(request->size);
1180         size = 1 << order;
1181
1182         alignment = (request->flags & _DRM_PAGE_ALIGN)
1183             ? PAGE_ALIGN(size) : size;
1184         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1185         total = PAGE_SIZE << page_order;
1186
1187         byte_count = 0;
1188         agp_offset = request->agp_start;
1189
1190         DRM_DEBUG("count:      %d\n", count);
1191         DRM_DEBUG("order:      %d\n", order);
1192         DRM_DEBUG("size:       %d\n", size);
1193         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1194         DRM_DEBUG("alignment:  %d\n", alignment);
1195         DRM_DEBUG("page_order: %d\n", page_order);
1196         DRM_DEBUG("total:      %d\n", total);
1197
1198         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1199                 return -EINVAL;
1200         if (dev->queue_count)
1201                 return -EBUSY;  /* Not while in use */
1202
1203         spin_lock(&dev->count_lock);
1204         if (dev->buf_use) {
1205                 spin_unlock(&dev->count_lock);
1206                 return -EBUSY;
1207         }
1208         atomic_inc(&dev->buf_alloc);
1209         spin_unlock(&dev->count_lock);
1210
1211         mutex_lock(&dev->struct_mutex);
1212         entry = &dma->bufs[order];
1213         if (entry->buf_count) {
1214                 mutex_unlock(&dev->struct_mutex);
1215                 atomic_dec(&dev->buf_alloc);
1216                 return -ENOMEM; /* May only call once for each order */
1217         }
1218
1219         if (count < 0 || count > 4096) {
1220                 mutex_unlock(&dev->struct_mutex);
1221                 atomic_dec(&dev->buf_alloc);
1222                 return -EINVAL;
1223         }
1224
1225         entry->buflist = kmalloc(count * sizeof(*entry->buflist),
1226                                 GFP_KERNEL);
1227         if (!entry->buflist) {
1228                 mutex_unlock(&dev->struct_mutex);
1229                 atomic_dec(&dev->buf_alloc);
1230                 return -ENOMEM;
1231         }
1232         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1233
1234         entry->buf_size = size;
1235         entry->page_order = page_order;
1236
1237         offset = 0;
1238
1239         while (entry->buf_count < count) {
1240                 buf = &entry->buflist[entry->buf_count];
1241                 buf->idx = dma->buf_count + entry->buf_count;
1242                 buf->total = alignment;
1243                 buf->order = order;
1244                 buf->used = 0;
1245
1246                 buf->offset = (dma->byte_count + offset);
1247                 buf->bus_address = agp_offset + offset;
1248                 buf->address = (void *)(agp_offset + offset);
1249                 buf->next = NULL;
1250                 buf->waiting = 0;
1251                 buf->pending = 0;
1252                 init_waitqueue_head(&buf->dma_wait);
1253                 buf->file_priv = NULL;
1254
1255                 buf->dev_priv_size = dev->driver->dev_priv_size;
1256                 buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL);
1257                 if (!buf->dev_private) {
1258                         /* Set count correctly so we free the proper amount. */
1259                         entry->buf_count = count;
1260                         drm_cleanup_buf_error(dev, entry);
1261                         mutex_unlock(&dev->struct_mutex);
1262                         atomic_dec(&dev->buf_alloc);
1263                         return -ENOMEM;
1264                 }
1265                 memset(buf->dev_private, 0, buf->dev_priv_size);
1266
1267                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1268
1269                 offset += alignment;
1270                 entry->buf_count++;
1271                 byte_count += PAGE_SIZE << page_order;
1272         }
1273
1274         DRM_DEBUG("byte_count: %d\n", byte_count);
1275
1276         temp_buflist = krealloc(dma->buflist,
1277                                 (dma->buf_count + entry->buf_count) *
1278                                 sizeof(*dma->buflist), GFP_KERNEL);
1279         if (!temp_buflist) {
1280                 /* Free the entry because it isn't valid */
1281                 drm_cleanup_buf_error(dev, entry);
1282                 mutex_unlock(&dev->struct_mutex);
1283                 atomic_dec(&dev->buf_alloc);
1284                 return -ENOMEM;
1285         }
1286         dma->buflist = temp_buflist;
1287
1288         for (i = 0; i < entry->buf_count; i++) {
1289                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1290         }
1291
1292         dma->buf_count += entry->buf_count;
1293         dma->seg_count += entry->seg_count;
1294         dma->page_count += byte_count >> PAGE_SHIFT;
1295         dma->byte_count += byte_count;
1296
1297         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1298         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1299
1300         mutex_unlock(&dev->struct_mutex);
1301
1302         request->count = entry->buf_count;
1303         request->size = size;
1304
1305         dma->flags = _DRM_DMA_USE_FB;
1306
1307         atomic_dec(&dev->buf_alloc);
1308         return 0;
1309 }
1310
1311
1312 /**
1313  * Add buffers for DMA transfers (ioctl).
1314  *
1315  * \param inode device inode.
1316  * \param file_priv DRM file private.
1317  * \param cmd command.
1318  * \param arg pointer to a struct drm_buf_desc request.
1319  * \return zero on success or a negative number on failure.
1320  *
1321  * According with the memory type specified in drm_buf_desc::flags and the
1322  * build options, it dispatches the call either to addbufs_agp(),
1323  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1324  * PCI memory respectively.
1325  */
1326 int drm_addbufs(struct drm_device *dev, void *data,
1327                 struct drm_file *file_priv)
1328 {
1329         struct drm_buf_desc *request = data;
1330         int ret;
1331
1332         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1333                 return -EINVAL;
1334
1335 #if __OS_HAS_AGP
1336         if (request->flags & _DRM_AGP_BUFFER)
1337                 ret = drm_addbufs_agp(dev, request);
1338         else
1339 #endif
1340         if (request->flags & _DRM_SG_BUFFER)
1341                 ret = drm_addbufs_sg(dev, request);
1342         else if (request->flags & _DRM_FB_BUFFER)
1343                 ret = drm_addbufs_fb(dev, request);
1344         else
1345                 ret = drm_addbufs_pci(dev, request);
1346
1347         return ret;
1348 }
1349
1350 /**
1351  * Get information about the buffer mappings.
1352  *
1353  * This was originally mean for debugging purposes, or by a sophisticated
1354  * client library to determine how best to use the available buffers (e.g.,
1355  * large buffers can be used for image transfer).
1356  *
1357  * \param inode device inode.
1358  * \param file_priv DRM file private.
1359  * \param cmd command.
1360  * \param arg pointer to a drm_buf_info structure.
1361  * \return zero on success or a negative number on failure.
1362  *
1363  * Increments drm_device::buf_use while holding the drm_device::count_lock
1364  * lock, preventing of allocating more buffers after this call. Information
1365  * about each requested buffer is then copied into user space.
1366  */
1367 int drm_infobufs(struct drm_device *dev, void *data,
1368                  struct drm_file *file_priv)
1369 {
1370         struct drm_device_dma *dma = dev->dma;
1371         struct drm_buf_info *request = data;
1372         int i;
1373         int count;
1374
1375         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1376                 return -EINVAL;
1377
1378         if (!dma)
1379                 return -EINVAL;
1380
1381         spin_lock(&dev->count_lock);
1382         if (atomic_read(&dev->buf_alloc)) {
1383                 spin_unlock(&dev->count_lock);
1384                 return -EBUSY;
1385         }
1386         ++dev->buf_use;         /* Can't allocate more after this call */
1387         spin_unlock(&dev->count_lock);
1388
1389         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1390                 if (dma->bufs[i].buf_count)
1391                         ++count;
1392         }
1393
1394         DRM_DEBUG("count = %d\n", count);
1395
1396         if (request->count >= count) {
1397                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1398                         if (dma->bufs[i].buf_count) {
1399                                 struct drm_buf_desc __user *to =
1400                                     &request->list[count];
1401                                 struct drm_buf_entry *from = &dma->bufs[i];
1402                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1403                                 if (copy_to_user(&to->count,
1404                                                  &from->buf_count,
1405                                                  sizeof(from->buf_count)) ||
1406                                     copy_to_user(&to->size,
1407                                                  &from->buf_size,
1408                                                  sizeof(from->buf_size)) ||
1409                                     copy_to_user(&to->low_mark,
1410                                                  &list->low_mark,
1411                                                  sizeof(list->low_mark)) ||
1412                                     copy_to_user(&to->high_mark,
1413                                                  &list->high_mark,
1414                                                  sizeof(list->high_mark)))
1415                                         return -EFAULT;
1416
1417                                 DRM_DEBUG("%d %d %d %d %d\n",
1418                                           i,
1419                                           dma->bufs[i].buf_count,
1420                                           dma->bufs[i].buf_size,
1421                                           dma->bufs[i].freelist.low_mark,
1422                                           dma->bufs[i].freelist.high_mark);
1423                                 ++count;
1424                         }
1425                 }
1426         }
1427         request->count = count;
1428
1429         return 0;
1430 }
1431
1432 /**
1433  * Specifies a low and high water mark for buffer allocation
1434  *
1435  * \param inode device inode.
1436  * \param file_priv DRM file private.
1437  * \param cmd command.
1438  * \param arg a pointer to a drm_buf_desc structure.
1439  * \return zero on success or a negative number on failure.
1440  *
1441  * Verifies that the size order is bounded between the admissible orders and
1442  * updates the respective drm_device_dma::bufs entry low and high water mark.
1443  *
1444  * \note This ioctl is deprecated and mostly never used.
1445  */
1446 int drm_markbufs(struct drm_device *dev, void *data,
1447                  struct drm_file *file_priv)
1448 {
1449         struct drm_device_dma *dma = dev->dma;
1450         struct drm_buf_desc *request = data;
1451         int order;
1452         struct drm_buf_entry *entry;
1453
1454         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1455                 return -EINVAL;
1456
1457         if (!dma)
1458                 return -EINVAL;
1459
1460         DRM_DEBUG("%d, %d, %d\n",
1461                   request->size, request->low_mark, request->high_mark);
1462         order = drm_order(request->size);
1463         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1464                 return -EINVAL;
1465         entry = &dma->bufs[order];
1466
1467         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1468                 return -EINVAL;
1469         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1470                 return -EINVAL;
1471
1472         entry->freelist.low_mark = request->low_mark;
1473         entry->freelist.high_mark = request->high_mark;
1474
1475         return 0;
1476 }
1477
1478 /**
1479  * Unreserve the buffers in list, previously reserved using drmDMA.
1480  *
1481  * \param inode device inode.
1482  * \param file_priv DRM file private.
1483  * \param cmd command.
1484  * \param arg pointer to a drm_buf_free structure.
1485  * \return zero on success or a negative number on failure.
1486  *
1487  * Calls free_buffer() for each used buffer.
1488  * This function is primarily used for debugging.
1489  */
1490 int drm_freebufs(struct drm_device *dev, void *data,
1491                  struct drm_file *file_priv)
1492 {
1493         struct drm_device_dma *dma = dev->dma;
1494         struct drm_buf_free *request = data;
1495         int i;
1496         int idx;
1497         struct drm_buf *buf;
1498
1499         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1500                 return -EINVAL;
1501
1502         if (!dma)
1503                 return -EINVAL;
1504
1505         DRM_DEBUG("%d\n", request->count);
1506         for (i = 0; i < request->count; i++) {
1507                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1508                         return -EFAULT;
1509                 if (idx < 0 || idx >= dma->buf_count) {
1510                         DRM_ERROR("Index %d (of %d max)\n",
1511                                   idx, dma->buf_count - 1);
1512                         return -EINVAL;
1513                 }
1514                 buf = dma->buflist[idx];
1515                 if (buf->file_priv != file_priv) {
1516                         DRM_ERROR("Process %d freeing buffer not owned\n",
1517                                   task_pid_nr(current));
1518                         return -EINVAL;
1519                 }
1520                 drm_free_buffer(dev, buf);
1521         }
1522
1523         return 0;
1524 }
1525
1526 /**
1527  * Maps all of the DMA buffers into client-virtual space (ioctl).
1528  *
1529  * \param inode device inode.
1530  * \param file_priv DRM file private.
1531  * \param cmd command.
1532  * \param arg pointer to a drm_buf_map structure.
1533  * \return zero on success or a negative number on failure.
1534  *
1535  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1536  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1537  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1538  * drm_mmap_dma().
1539  */
1540 int drm_mapbufs(struct drm_device *dev, void *data,
1541                 struct drm_file *file_priv)
1542 {
1543         struct drm_device_dma *dma = dev->dma;
1544         int retcode = 0;
1545         const int zero = 0;
1546         unsigned long virtual;
1547         unsigned long address;
1548         struct drm_buf_map *request = data;
1549         int i;
1550
1551         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1552                 return -EINVAL;
1553
1554         if (!dma)
1555                 return -EINVAL;
1556
1557         spin_lock(&dev->count_lock);
1558         if (atomic_read(&dev->buf_alloc)) {
1559                 spin_unlock(&dev->count_lock);
1560                 return -EBUSY;
1561         }
1562         dev->buf_use++;         /* Can't allocate more after this call */
1563         spin_unlock(&dev->count_lock);
1564
1565         if (request->count >= dma->buf_count) {
1566                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1567                     || (drm_core_check_feature(dev, DRIVER_SG)
1568                         && (dma->flags & _DRM_DMA_USE_SG))
1569                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1570                         && (dma->flags & _DRM_DMA_USE_FB))) {
1571                         struct drm_local_map *map = dev->agp_buffer_map;
1572                         unsigned long token = dev->agp_buffer_token;
1573
1574                         if (!map) {
1575                                 retcode = -EINVAL;
1576                                 goto done;
1577                         }
1578                         down_write(&current->mm->mmap_sem);
1579                         virtual = do_mmap(file_priv->filp, 0, map->size,
1580                                           PROT_READ | PROT_WRITE,
1581                                           MAP_SHARED,
1582                                           token);
1583                         up_write(&current->mm->mmap_sem);
1584                 } else {
1585                         down_write(&current->mm->mmap_sem);
1586                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1587                                           PROT_READ | PROT_WRITE,
1588                                           MAP_SHARED, 0);
1589                         up_write(&current->mm->mmap_sem);
1590                 }
1591                 if (virtual > -1024UL) {
1592                         /* Real error */
1593                         retcode = (signed long)virtual;
1594                         goto done;
1595                 }
1596                 request->virtual = (void __user *)virtual;
1597
1598                 for (i = 0; i < dma->buf_count; i++) {
1599                         if (copy_to_user(&request->list[i].idx,
1600                                          &dma->buflist[i]->idx,
1601                                          sizeof(request->list[0].idx))) {
1602                                 retcode = -EFAULT;
1603                                 goto done;
1604                         }
1605                         if (copy_to_user(&request->list[i].total,
1606                                          &dma->buflist[i]->total,
1607                                          sizeof(request->list[0].total))) {
1608                                 retcode = -EFAULT;
1609                                 goto done;
1610                         }
1611                         if (copy_to_user(&request->list[i].used,
1612                                          &zero, sizeof(zero))) {
1613                                 retcode = -EFAULT;
1614                                 goto done;
1615                         }
1616                         address = virtual + dma->buflist[i]->offset;    /* *** */
1617                         if (copy_to_user(&request->list[i].address,
1618                                          &address, sizeof(address))) {
1619                                 retcode = -EFAULT;
1620                                 goto done;
1621                         }
1622                 }
1623         }
1624       done:
1625         request->count = dma->buf_count;
1626         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1627
1628         return retcode;
1629 }
1630
1631 /**
1632  * Compute size order.  Returns the exponent of the smaller power of two which
1633  * is greater or equal to given number.
1634  *
1635  * \param size size.
1636  * \return order.
1637  *
1638  * \todo Can be made faster.
1639  */
1640 int drm_order(unsigned long size)
1641 {
1642         int order;
1643         unsigned long tmp;
1644
1645         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1646
1647         if (size & (size - 1))
1648                 ++order;
1649
1650         return order;
1651 }
1652 EXPORT_SYMBOL(drm_order);