linux-core/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 "drmP.h"
  38
  39 unsigned long drm_get_resource_start(struct drm_device *dev, unsigned int resource)
  40 {
  41         return pci_resource_start(dev->pdev, resource);
  42 }
  43 EXPORT_SYMBOL(drm_get_resource_start);
  44
  45 unsigned long drm_get_resource_len(struct drm_device *dev, unsigned int resource)
  46 {
  47         return pci_resource_len(dev->pdev, resource);
  48 }
  49 EXPORT_SYMBOL(drm_get_resource_len);
  50
  51 struct drm_map_list *drm_find_matching_map(struct drm_device *dev, drm_local_map_t *map)
  52 {
  53         struct drm_map_list *entry;
  54         list_for_each_entry(entry, &dev->maplist, head) {
  55                 if (entry->map && (entry->master == dev->primary->master) && (map->type == entry->map->type) &&
  56                     ((entry->map->offset == map->offset) ||
  57                      ((map->type == _DRM_SHM) && (map->flags&_DRM_CONTAINS_LOCK)))) {
  58                         return entry;
  59                 }
  60         }
  61
  62         return NULL;
  63 }
  64 EXPORT_SYMBOL(drm_find_matching_map);
  65
  66 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  67                           unsigned long user_token, int hashed_handle)
  68 {
  69         int use_hashed_handle;
  70
  71 #if (BITS_PER_LONG == 64)
  72         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  73 #elif (BITS_PER_LONG == 32)
  74         use_hashed_handle = hashed_handle;
  75 #else
  76 #error Unsupported long size. Neither 64 nor 32 bits.
  77 #endif
  78
  79         if (!use_hashed_handle) {
  80                 int ret;
  81                 hash->key = user_token >> PAGE_SHIFT;
  82                 ret = drm_ht_insert_item(&dev->map_hash, hash);
  83                 if (ret != -EINVAL)
  84                         return ret;
  85         }
  86         return drm_ht_just_insert_please(&dev->map_hash, hash,
  87                                          user_token, 32 - PAGE_SHIFT - 3,
  88                                          0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT);
  89 }
  90
  91 /**
  92  * Ioctl to specify a range of memory that is available for mapping by a non-root process.
  93  *
  94  * \param inode device inode.
  95  * \param file_priv DRM file private.
  96  * \param cmd command.
  97  * \param arg pointer to a drm_map structure.
  98  * \return zero on success or a negative value on error.
  99  *
 100  * Adjusts the memory offset to its absolute value according to the mapping
 101  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 102  * applicable and if supported by the kernel.
 103  */
 104 static int drm_addmap_core(struct drm_device *dev, unsigned int offset,
 105                            unsigned int size, enum drm_map_type type,
 106                            enum drm_map_flags flags,
 107                            struct drm_map_list **maplist)
 108 {
 109         struct drm_map *map;
 110         struct drm_map_list *list;
 111         drm_dma_handle_t *dmah;
 112         unsigned long user_token;
 113         int ret;
 114
 115         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
 116         if (!map)
 117                 return -ENOMEM;
 118
 119         map->offset = offset;
 120         map->size = size;
 121         map->flags = flags;
 122         map->type = type;
 123
 124         /* Only allow shared memory to be removable since we only keep enough
 125          * book keeping information about shared memory to allow for removal
 126          * when processes fork.
 127          */
 128         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 129                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 130                 return -EINVAL;
 131         }
 132         DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
 133                   map->offset, map->size, map->type);
 134         if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 135                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 136                 return -EINVAL;
 137         }
 138         map->mtrr = -1;
 139         map->handle = NULL;
 140
 141         switch (map->type) {
 142         case _DRM_REGISTERS:
 143         case _DRM_FRAME_BUFFER:
 144 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 145                 if (map->offset + (map->size - 1) < map->offset ||
 146                     map->offset < virt_to_phys(high_memory)) {
 147                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 148                         return -EINVAL;
 149                 }
 150 #endif
 151 #ifdef __alpha__
 152                 map->offset += dev->hose->mem_space->start;
 153 #endif
 154                 /* Some drivers preinitialize some maps, without the X Server
 155                  * needing to be aware of it.  Therefore, we just return success
 156                  * when the server tries to create a duplicate map.
 157                  */
 158                 list = drm_find_matching_map(dev, map);
 159                 if (list != NULL) {
 160                         if (list->map->size != map->size) {
 161                                 DRM_DEBUG("Matching maps of type %d with "
 162                                           "mismatched sizes, (%ld vs %ld)\n",
 163                                           map->type, map->size,
 164                                           list->map->size);
 165                                 list->map->size = map->size;
 166                         }
 167
 168                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 169                         *maplist = list;
 170                         return 0;
 171                 }
 172
 173                 if (drm_core_has_MTRR(dev)) {
 174                         if (map->type == _DRM_FRAME_BUFFER ||
 175                             (map->flags & _DRM_WRITE_COMBINING)) {
 176                                 map->mtrr = mtrr_add(map->offset, map->size,
 177                                                      MTRR_TYPE_WRCOMB, 1);
 178                         }
 179                 }
 180                 if (map->type == _DRM_REGISTERS) {
 181                         map->handle = ioremap(map->offset, map->size);
 182                         if (!map->handle) {
 183                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 184                                 return -ENOMEM;
 185                         }
 186                 }
 187                 break;
 188         case _DRM_SHM:
 189                 list = drm_find_matching_map(dev, map);
 190                 if (list != NULL) {
 191                         if(list->map->size != map->size) {
 192                                 DRM_DEBUG("Matching maps of type %d with "
 193                                    "mismatched sizes, (%ld vs %ld)\n",
 194                                     map->type, map->size, list->map->size);
 195                                 list->map->size = map->size;
 196                         }
 197
 198                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 199                         *maplist = list;
 200                         return 0;
 201                 }
 202                 map->handle = vmalloc_user(map->size);
 203                 DRM_DEBUG("%lu %d %p\n",
 204                           map->size, drm_order(map->size), map->handle);
 205                 if (!map->handle) {
 206                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 207                         return -ENOMEM;
 208                 }
 209                 map->offset = (unsigned long)map->handle;
 210                 if (map->flags & _DRM_CONTAINS_LOCK) {
 211                         /* Prevent a 2nd X Server from creating a 2nd lock */
 212                         if (dev->primary->master->lock.hw_lock != NULL) {
 213                                 vfree(map->handle);
 214                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 215                                 return -EBUSY;
 216                         }
 217                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 218                 }
 219                 break;
 220         case _DRM_AGP: {
 221                 struct drm_agp_mem *entry;
 222                 int valid = 0;
 223
 224                 if (!drm_core_has_AGP(dev)) {
 225                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 226                         return -EINVAL;
 227                 }
 228 #ifdef __alpha__
 229                 map->offset += dev->hose->mem_space->start;
 230 #endif
 231                 /* In some cases (i810 driver), user space may have already
 232                  * added the AGP base itself, because dev->agp->base previously
 233                  * only got set during AGP enable.  So, only add the base
 234                  * address if the map's offset isn't already within the
 235                  * aperture.
 236                  */
 237                 if (map->offset < dev->agp->base ||
 238                     map->offset > dev->agp->base +
 239                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 240                         map->offset += dev->agp->base;
 241                 }
 242                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 243
 244                 /* This assumes the DRM is in total control of AGP space.
 245                  * It's not always the case as AGP can be in the control
 246                  * of user space (i.e. i810 driver). So this loop will get
 247                  * skipped and we double check that dev->agp->memory is
 248                  * actually set as well as being invalid before EPERM'ing
 249                  */
 250                 list_for_each_entry(entry, &dev->agp->memory, head) {
 251                         if ((map->offset >= entry->bound) &&
 252                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 253                                 valid = 1;
 254                                 break;
 255                         }
 256                 }
 257                 if (!list_empty(&dev->agp->memory) && !valid) {
 258                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 259                         return -EPERM;
 260                 }
 261                 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
 262                 break;
 263         }
 264         case _DRM_SCATTER_GATHER:
 265                 if (!dev->sg) {
 266                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 267                         return -EINVAL;
 268                 }
 269                 map->offset += (unsigned long)dev->sg->virtual;
 270                 break;
 271         case _DRM_CONSISTENT:
 272                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 273                  * As we're limiting the address to 2^32-1 (or less),
 274                  * casting it down to 32 bits is no problem, but we
 275                  * need to point to a 64bit variable first. */
 276                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 277                 if (!dmah) {
 278                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 279                         return -ENOMEM;
 280                 }
 281                 map->handle = dmah->vaddr;
 282                 map->offset = (unsigned long)dmah->busaddr;
 283                 kfree(dmah);
 284                 break;
 285         default:
 286                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 287                 return -EINVAL;
 288         }
 289
 290         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 291         if (!list) {
 292                 if (map->type == _DRM_REGISTERS)
 293                         iounmap(map->handle);
 294                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 295                 return -EINVAL;
 296         }
 297         memset(list, 0, sizeof(*list));
 298         list->map = map;
 299
 300         mutex_lock(&dev->struct_mutex);
 301         list_add(&list->head, &dev->maplist);
 302
 303         /* Assign a 32-bit handle */
 304
 305         user_token = (map->type == _DRM_SHM) ? (unsigned long) map->handle :
 306                 map->offset;
 307         ret = drm_map_handle(dev, &list->hash, user_token, 0);
 308
 309         if (ret) {
 310                 if (map->type == _DRM_REGISTERS)
 311                         iounmap(map->handle);
 312                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 313                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 314                 mutex_unlock(&dev->struct_mutex);
 315                 return ret;
 316         }
 317
 318         list->user_token = list->hash.key << PAGE_SHIFT;
 319         mutex_unlock(&dev->struct_mutex);
 320
 321         list->master = dev->primary->master;
 322         *maplist = list;
 323         return 0;
 324 }
 325
 326 int drm_addmap(struct drm_device *dev, unsigned int offset,
 327                unsigned int size, enum drm_map_type type,
 328                enum drm_map_flags flags, drm_local_map_t ** map_ptr)
 329 {
 330         struct drm_map_list *list;
 331         int rc;
 332
 333         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 334         if (!rc)
 335                 *map_ptr = list->map;
 336         return rc;
 337 }
 338
 339 EXPORT_SYMBOL(drm_addmap);
 340
 341 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 342                      struct drm_file *file_priv)
 343 {
 344         struct drm_map *map = data;
 345         struct drm_map_list *maplist;
 346         int err;
 347
 348         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 349                 return -EPERM;
 350
 351         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 352                               map->flags, &maplist);
 353
 354         if (err)
 355                 return err;
 356
 357         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 358         map->handle = (void *)(unsigned long)maplist->user_token;
 359         return 0;
 360 }
 361
 362 /**
 363  * Remove a map private from list and deallocate resources if the mapping
 364  * isn't in use.
 365  *
 366  * \param inode device inode.
 367  * \param file_priv DRM file private.
 368  * \param cmd command.
 369  * \param arg pointer to a struct drm_map structure.
 370  * \return zero on success or a negative value on error.
 371  *
 372  * Searches the map on drm_device::maplist, removes it from the list, see if
 373  * its being used, and free any associate resource (such as MTRR's) if it's not
 374  * being on use.
 375  *
 376  * \sa drm_addmap
 377  */
 378 int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
 379 {
 380         struct drm_map_list *r_list = NULL, *list_t;
 381         drm_dma_handle_t dmah;
 382         int found = 0;
 383         struct drm_master *master;
 384
 385         /* Find the list entry for the map and remove it */
 386         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 387                 if (r_list->map == map) {
 388                         master = r_list->master;
 389                         list_del(&r_list->head);
 390                         drm_ht_remove_key(&dev->map_hash,
 391                                           r_list->user_token >> PAGE_SHIFT);
 392                         drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
 393                         found = 1;
 394                         break;
 395                 }
 396         }
 397
 398         if (!found)
 399                 return -EINVAL;
 400
 401         /* List has wrapped around to the head pointer, or it's empty and we
 402          * didn't find anything.
 403          */
 404
 405         switch (map->type) {
 406         case _DRM_REGISTERS:
 407                 iounmap(map->handle);
 408                 /* FALLTHROUGH */
 409         case _DRM_FRAME_BUFFER:
 410                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 411                         int retcode;
 412                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 413                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 414                 }
 415                 break;
 416         case _DRM_SHM:
 417                 vfree(map->handle);
 418                 if (master) {
 419                         if (dev->sigdata.lock == master->lock.hw_lock)
 420                                 dev->sigdata.lock = NULL;
 421                         master->lock.hw_lock = NULL;   /* SHM removed */
 422                         master->lock.file_priv = NULL;
 423                         wake_up_interruptible(&master->lock.lock_queue);
 424                 }
 425                 break;
 426         case _DRM_AGP:
 427         case _DRM_SCATTER_GATHER:
 428                 break;
 429         case _DRM_CONSISTENT:
 430                 dmah.vaddr = map->handle;
 431                 dmah.busaddr = map->offset;
 432                 dmah.size = map->size;
 433                 __drm_pci_free(dev, &dmah);
 434                 break;
 435         case _DRM_TTM:
 436                 BUG_ON(1);
 437         }
 438         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 439
 440         return 0;
 441 }
 442 EXPORT_SYMBOL(drm_rmmap_locked);
 443
 444 int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
 445 {
 446         int ret;
 447
 448         mutex_lock(&dev->struct_mutex);
 449         ret = drm_rmmap_locked(dev, map);
 450         mutex_unlock(&dev->struct_mutex);
 451
 452         return ret;
 453 }
 454 EXPORT_SYMBOL(drm_rmmap);
 455
 456 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 457  * the last close of the device, and this is necessary for cleanup when things
 458  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 459  * like a pointless exercise since they're going away anyway.
 460  *
 461  * One use case might be after addmap is allowed for normal users for SHM and
 462  * gets used by drivers that the server doesn't need to care about.  This seems
 463  * unlikely.
 464  */
 465 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 466                     struct drm_file *file_priv)
 467 {
 468         struct drm_map *request = data;
 469         drm_local_map_t *map = NULL;
 470         struct drm_map_list *r_list;
 471         int ret;
 472
 473         mutex_lock(&dev->struct_mutex);
 474         list_for_each_entry(r_list, &dev->maplist, head) {
 475                 if (r_list->map &&
 476                     r_list->user_token == (unsigned long)request->handle &&
 477                     r_list->map->flags & _DRM_REMOVABLE) {
 478                         map = r_list->map;
 479                         break;
 480                 }
 481         }
 482
 483         /* List has wrapped around to the head pointer, or its empty we didn't
 484          * find anything.
 485          */
 486         if (list_empty(&dev->maplist) || !map) {
 487                 mutex_unlock(&dev->struct_mutex);
 488                 return -EINVAL;
 489         }
 490
 491         /* Register and framebuffer maps are permanent */
 492         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 493                 mutex_unlock(&dev->struct_mutex);
 494                 return 0;
 495         }
 496
 497         ret = drm_rmmap_locked(dev, map);
 498
 499         mutex_unlock(&dev->struct_mutex);
 500
 501         return ret;
 502 }
 503
 504 /**
 505  * Cleanup after an error on one of the addbufs() functions.
 506  *
 507  * \param dev DRM device.
 508  * \param entry buffer entry where the error occurred.
 509  *
 510  * Frees any pages and buffers associated with the given entry.
 511  */
 512 static void drm_cleanup_buf_error(struct drm_device *dev,
 513                                   struct drm_buf_entry *entry)
 514 {
 515         int i;
 516
 517         if (entry->seg_count) {
 518                 for (i = 0; i < entry->seg_count; i++) {
 519                         if (entry->seglist[i]) {
 520                                 drm_pci_free(dev, entry->seglist[i]);
 521                         }
 522                 }
 523                 drm_free(entry->seglist,
 524                          entry->seg_count *
 525                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 526
 527                 entry->seg_count = 0;
 528         }
 529
 530         if (entry->buf_count) {
 531                 for (i = 0; i < entry->buf_count; i++) {
 532                         if (entry->buflist[i].dev_private) {
 533                                 drm_free(entry->buflist[i].dev_private,
 534                                          entry->buflist[i].dev_priv_size,
 535                                          DRM_MEM_BUFS);
 536                         }
 537                 }
 538                 drm_free(entry->buflist,
 539                          entry->buf_count *
 540                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 541
 542                 entry->buf_count = 0;
 543         }
 544 }
 545
 546 #if __OS_HAS_AGP
 547 /**
 548  * Add AGP buffers for DMA transfers.
 549  *
 550  * \param dev struct drm_device to which the buffers are to be added.
 551  * \param request pointer to a struct drm_buf_desc describing the request.
 552  * \return zero on success or a negative number on failure.
 553  *
 554  * After some sanity checks creates a drm_buf structure for each buffer and
 555  * reallocates the buffer list of the same size order to accommodate the new
 556  * buffers.
 557  */
 558 int drm_addbufs_agp(struct drm_device *dev, struct drm_buf_desc *request)
 559 {
 560         struct drm_device_dma *dma = dev->dma;
 561         struct drm_buf_entry *entry;
 562         struct drm_agp_mem *agp_entry;
 563         struct drm_buf *buf;
 564         unsigned long offset;
 565         unsigned long agp_offset;
 566         int count;
 567         int order;
 568         int size;
 569         int alignment;
 570         int page_order;
 571         int total;
 572         int byte_count;
 573         int i, valid;
 574         struct drm_buf **temp_buflist;
 575
 576         if (!dma)
 577                 return -EINVAL;
 578
 579         count = request->count;
 580         order = drm_order(request->size);
 581         size = 1 << order;
 582
 583         alignment = (request->flags & _DRM_PAGE_ALIGN)
 584             ? PAGE_ALIGN(size) : size;
 585         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 586         total = PAGE_SIZE << page_order;
 587
 588         byte_count = 0;
 589         agp_offset = dev->agp->base + request->agp_start;
 590
 591         DRM_DEBUG("count:      %d\n", count);
 592         DRM_DEBUG("order:      %d\n", order);
 593         DRM_DEBUG("size:       %d\n", size);
 594         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 595         DRM_DEBUG("alignment:  %d\n", alignment);
 596         DRM_DEBUG("page_order: %d\n", page_order);
 597         DRM_DEBUG("total:      %d\n", total);
 598
 599         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 600                 return -EINVAL;
 601         if (dev->queue_count)
 602                 return -EBUSY;  /* Not while in use */
 603
 604         /* Make sure buffers are located in AGP memory that we own */
 605         valid = 0;
 606         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 607                 if ((agp_offset >= agp_entry->bound) &&
 608                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 609                         valid = 1;
 610                         break;
 611                 }
 612         }
 613         if (!list_empty(&dev->agp->memory) && !valid) {
 614                 DRM_DEBUG("zone invalid\n");
 615                 return -EINVAL;
 616         }
 617         spin_lock(&dev->count_lock);
 618         if (dev->buf_use) {
 619                 spin_unlock(&dev->count_lock);
 620                 return -EBUSY;
 621         }
 622         atomic_inc(&dev->buf_alloc);
 623         spin_unlock(&dev->count_lock);
 624
 625         mutex_lock(&dev->struct_mutex);
 626         entry = &dma->bufs[order];
 627         if (entry->buf_count) {
 628                 mutex_unlock(&dev->struct_mutex);
 629                 atomic_dec(&dev->buf_alloc);
 630                 return -ENOMEM; /* May only call once for each order */
 631         }
 632
 633         if (count < 0 || count > 4096) {
 634                 mutex_unlock(&dev->struct_mutex);
 635                 atomic_dec(&dev->buf_alloc);
 636                 return -EINVAL;
 637         }
 638
 639         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 640                                    DRM_MEM_BUFS);
 641         if (!entry->buflist) {
 642                 mutex_unlock(&dev->struct_mutex);
 643                 atomic_dec(&dev->buf_alloc);
 644                 return -ENOMEM;
 645         }
 646         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 647
 648         entry->buf_size = size;
 649         entry->page_order = page_order;
 650
 651         offset = 0;
 652
 653         while (entry->buf_count < count) {
 654                 buf = &entry->buflist[entry->buf_count];
 655                 buf->idx = dma->buf_count + entry->buf_count;
 656                 buf->total = alignment;
 657                 buf->order = order;
 658                 buf->used = 0;
 659
 660                 buf->offset = (dma->byte_count + offset);
 661                 buf->bus_address = agp_offset + offset;
 662                 buf->address = (void *)(agp_offset + offset);
 663                 buf->next = NULL;
 664                 buf->waiting = 0;
 665                 buf->pending = 0;
 666                 init_waitqueue_head(&buf->dma_wait);
 667                 buf->file_priv = NULL;
 668
 669                 buf->dev_priv_size = dev->driver->dev_priv_size;
 670                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 671                 if (!buf->dev_private) {
 672                         /* Set count correctly so we free the proper amount. */
 673                         entry->buf_count = count;
 674                         drm_cleanup_buf_error(dev, entry);
 675                         mutex_unlock(&dev->struct_mutex);
 676                         atomic_dec(&dev->buf_alloc);
 677                         return -ENOMEM;
 678                 }
 679                 memset(buf->dev_private, 0, buf->dev_priv_size);
 680
 681                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 682
 683                 offset += alignment;
 684                 entry->buf_count++;
 685                 byte_count += PAGE_SIZE << page_order;
 686         }
 687
 688         DRM_DEBUG("byte_count: %d\n", byte_count);
 689
 690         temp_buflist = drm_realloc(dma->buflist,
 691                                    dma->buf_count * sizeof(*dma->buflist),
 692                                    (dma->buf_count + entry->buf_count)
 693                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 694         if (!temp_buflist) {
 695                 /* Free the entry because it isn't valid */
 696                 drm_cleanup_buf_error(dev, entry);
 697                 mutex_unlock(&dev->struct_mutex);
 698                 atomic_dec(&dev->buf_alloc);
 699                 return -ENOMEM;
 700         }
 701         dma->buflist = temp_buflist;
 702
 703         for (i = 0; i < entry->buf_count; i++) {
 704                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 705         }
 706
 707         dma->buf_count += entry->buf_count;
 708         dma->seg_count += entry->seg_count;
 709         dma->page_count += byte_count >> PAGE_SHIFT;
 710         dma->byte_count += byte_count;
 711
 712         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 713         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 714
 715         mutex_unlock(&dev->struct_mutex);
 716
 717         request->count = entry->buf_count;
 718         request->size = size;
 719
 720         dma->flags = _DRM_DMA_USE_AGP;
 721
 722         atomic_dec(&dev->buf_alloc);
 723         return 0;
 724 }
 725 EXPORT_SYMBOL(drm_addbufs_agp);
 726 #endif                          /* __OS_HAS_AGP */
 727
 728 int drm_addbufs_pci(struct drm_device *dev, struct drm_buf_desc *request)
 729 {
 730         struct drm_device_dma *dma = dev->dma;
 731         int count;
 732         int order;
 733         int size;
 734         int total;
 735         int page_order;
 736         struct drm_buf_entry *entry;
 737         drm_dma_handle_t *dmah;
 738         struct drm_buf *buf;
 739         int alignment;
 740         unsigned long offset;
 741         int i;
 742         int byte_count;
 743         int page_count;
 744         unsigned long *temp_pagelist;
 745         struct drm_buf **temp_buflist;
 746
 747         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 748                 return -EINVAL;
 749
 750         if (!dma)
 751                 return -EINVAL;
 752
 753         if (!capable(CAP_SYS_ADMIN))
 754                 return -EPERM;
 755
 756         count = request->count;
 757         order = drm_order(request->size);
 758         size = 1 << order;
 759
 760         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 761                   request->count, request->size, size, order, dev->queue_count);
 762
 763         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 764                 return -EINVAL;
 765         if (dev->queue_count)
 766                 return -EBUSY;  /* Not while in use */
 767
 768         alignment = (request->flags & _DRM_PAGE_ALIGN)
 769             ? PAGE_ALIGN(size) : size;
 770         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 771         total = PAGE_SIZE << page_order;
 772
 773         spin_lock(&dev->count_lock);
 774         if (dev->buf_use) {
 775                 spin_unlock(&dev->count_lock);
 776                 return -EBUSY;
 777         }
 778         atomic_inc(&dev->buf_alloc);
 779         spin_unlock(&dev->count_lock);
 780
 781         mutex_lock(&dev->struct_mutex);
 782         entry = &dma->bufs[order];
 783         if (entry->buf_count) {
 784                 mutex_unlock(&dev->struct_mutex);
 785                 atomic_dec(&dev->buf_alloc);
 786                 return -ENOMEM; /* May only call once for each order */
 787         }
 788
 789         if (count < 0 || count > 4096) {
 790                 mutex_unlock(&dev->struct_mutex);
 791                 atomic_dec(&dev->buf_alloc);
 792                 return -EINVAL;
 793         }
 794
 795         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 796                                    DRM_MEM_BUFS);
 797         if (!entry->buflist) {
 798                 mutex_unlock(&dev->struct_mutex);
 799                 atomic_dec(&dev->buf_alloc);
 800                 return -ENOMEM;
 801         }
 802         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 803
 804         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 805                                    DRM_MEM_SEGS);
 806         if (!entry->seglist) {
 807                 drm_free(entry->buflist,
 808                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 809                 mutex_unlock(&dev->struct_mutex);
 810                 atomic_dec(&dev->buf_alloc);
 811                 return -ENOMEM;
 812         }
 813         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 814
 815         /* Keep the original pagelist until we know all the allocations
 816          * have succeeded
 817          */
 818         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 819                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 820         if (!temp_pagelist) {
 821                 drm_free(entry->buflist,
 822                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 823                 drm_free(entry->seglist,
 824                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 825                 mutex_unlock(&dev->struct_mutex);
 826                 atomic_dec(&dev->buf_alloc);
 827                 return -ENOMEM;
 828         }
 829         memcpy(temp_pagelist,
 830                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 831         DRM_DEBUG("pagelist: %d entries\n",
 832                   dma->page_count + (count << page_order));
 833
 834         entry->buf_size = size;
 835         entry->page_order = page_order;
 836         byte_count = 0;
 837         page_count = 0;
 838
 839         while (entry->buf_count < count) {
 840
 841                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 842
 843                 if (!dmah) {
 844                         /* Set count correctly so we free the proper amount. */
 845                         entry->buf_count = count;
 846                         entry->seg_count = count;
 847                         drm_cleanup_buf_error(dev, entry);
 848                         drm_free(temp_pagelist,
 849                                  (dma->page_count + (count << page_order))
 850                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 851                         mutex_unlock(&dev->struct_mutex);
 852                         atomic_dec(&dev->buf_alloc);
 853                         return -ENOMEM;
 854                 }
 855                 entry->seglist[entry->seg_count++] = dmah;
 856                 for (i = 0; i < (1 << page_order); i++) {
 857                         DRM_DEBUG("page %d @ 0x%08lx\n",
 858                                   dma->page_count + page_count,
 859                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 860                         temp_pagelist[dma->page_count + page_count++]
 861                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 862                 }
 863                 for (offset = 0;
 864                      offset + size <= total && entry->buf_count < count;
 865                      offset += alignment, ++entry->buf_count) {
 866                         buf = &entry->buflist[entry->buf_count];
 867                         buf->idx = dma->buf_count + entry->buf_count;
 868                         buf->total = alignment;
 869                         buf->order = order;
 870                         buf->used = 0;
 871                         buf->offset = (dma->byte_count + byte_count + offset);
 872                         buf->address = (void *)(dmah->vaddr + offset);
 873                         buf->bus_address = dmah->busaddr + offset;
 874                         buf->next = NULL;
 875                         buf->waiting = 0;
 876                         buf->pending = 0;
 877                         init_waitqueue_head(&buf->dma_wait);
 878                         buf->file_priv = NULL;
 879
 880                         buf->dev_priv_size = dev->driver->dev_priv_size;
 881                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 882                                                      DRM_MEM_BUFS);
 883                         if (!buf->dev_private) {
 884                                 /* Set count correctly so we free the proper amount. */
 885                                 entry->buf_count = count;
 886                                 entry->seg_count = count;
 887                                 drm_cleanup_buf_error(dev, entry);
 888                                 drm_free(temp_pagelist,
 889                                          (dma->page_count +
 890                                           (count << page_order))
 891                                          * sizeof(*dma->pagelist),
 892                                          DRM_MEM_PAGES);
 893                                 mutex_unlock(&dev->struct_mutex);
 894                                 atomic_dec(&dev->buf_alloc);
 895                                 return -ENOMEM;
 896                         }
 897                         memset(buf->dev_private, 0, buf->dev_priv_size);
 898
 899                         DRM_DEBUG("buffer %d @ %p\n",
 900                                   entry->buf_count, buf->address);
 901                 }
 902                 byte_count += PAGE_SIZE << page_order;
 903         }
 904
 905         temp_buflist = drm_realloc(dma->buflist,
 906                                    dma->buf_count * sizeof(*dma->buflist),
 907                                    (dma->buf_count + entry->buf_count)
 908                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 909         if (!temp_buflist) {
 910                 /* Free the entry because it isn't valid */
 911                 drm_cleanup_buf_error(dev, entry);
 912                 drm_free(temp_pagelist,
 913                          (dma->page_count + (count << page_order))
 914                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 915                 mutex_unlock(&dev->struct_mutex);
 916                 atomic_dec(&dev->buf_alloc);
 917                 return -ENOMEM;
 918         }
 919         dma->buflist = temp_buflist;
 920
 921         for (i = 0; i < entry->buf_count; i++) {
 922                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 923         }
 924
 925         /* No allocations failed, so now we can replace the orginal pagelist
 926          * with the new one.
 927          */
 928         if (dma->page_count) {
 929                 drm_free(dma->pagelist,
 930                          dma->page_count * sizeof(*dma->pagelist),
 931                          DRM_MEM_PAGES);
 932         }
 933         dma->pagelist = temp_pagelist;
 934
 935         dma->buf_count += entry->buf_count;
 936         dma->seg_count += entry->seg_count;
 937         dma->page_count += entry->seg_count << page_order;
 938         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 939
 940         mutex_unlock(&dev->struct_mutex);
 941
 942         request->count = entry->buf_count;
 943         request->size = size;
 944
 945         if (request->flags & _DRM_PCI_BUFFER_RO)
 946                 dma->flags = _DRM_DMA_USE_PCI_RO;
 947
 948         atomic_dec(&dev->buf_alloc);
 949         return 0;
 950
 951 }
 952 EXPORT_SYMBOL(drm_addbufs_pci);
 953
 954 static int drm_addbufs_sg(struct drm_device *dev, struct drm_buf_desc *request)
 955 {
 956         struct drm_device_dma *dma = dev->dma;
 957         struct drm_buf_entry *entry;
 958         struct drm_buf *buf;
 959         unsigned long offset;
 960         unsigned long agp_offset;
 961         int count;
 962         int order;
 963         int size;
 964         int alignment;
 965         int page_order;
 966         int total;
 967         int byte_count;
 968         int i;
 969         struct drm_buf **temp_buflist;
 970
 971         if (!drm_core_check_feature(dev, DRIVER_SG))
 972                 return -EINVAL;
 973
 974         if (!dma)
 975                 return -EINVAL;
 976
 977         if (!capable(CAP_SYS_ADMIN))
 978                 return -EPERM;
 979
 980         count = request->count;
 981         order = drm_order(request->size);
 982         size = 1 << order;
 983
 984         alignment = (request->flags & _DRM_PAGE_ALIGN)
 985             ? PAGE_ALIGN(size) : size;
 986         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 987         total = PAGE_SIZE << page_order;
 988
 989         byte_count = 0;
 990         agp_offset = request->agp_start;
 991
 992         DRM_DEBUG("count:      %d\n", count);
 993         DRM_DEBUG("order:      %d\n", order);
 994         DRM_DEBUG("size:       %d\n", size);
 995         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 996         DRM_DEBUG("alignment:  %d\n", alignment);
 997         DRM_DEBUG("page_order: %d\n", page_order);
 998         DRM_DEBUG("total:      %d\n", total);
 999
1000         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1001                 return -EINVAL;
1002         if (dev->queue_count)
1003                 return -EBUSY;  /* Not while in use */
1004
1005         spin_lock(&dev->count_lock);
1006         if (dev->buf_use) {
1007                 spin_unlock(&dev->count_lock);
1008                 return -EBUSY;
1009         }
1010         atomic_inc(&dev->buf_alloc);
1011         spin_unlock(&dev->count_lock);
1012
1013         mutex_lock(&dev->struct_mutex);
1014         entry = &dma->bufs[order];
1015         if (entry->buf_count) {
1016                 mutex_unlock(&dev->struct_mutex);
1017                 atomic_dec(&dev->buf_alloc);
1018                 return -ENOMEM; /* May only call once for each order */
1019         }
1020
1021         if (count < 0 || count > 4096) {
1022                 mutex_unlock(&dev->struct_mutex);
1023                 atomic_dec(&dev->buf_alloc);
1024                 return -EINVAL;
1025         }
1026
1027         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1028                                    DRM_MEM_BUFS);
1029         if (!entry->buflist) {
1030                 mutex_unlock(&dev->struct_mutex);
1031                 atomic_dec(&dev->buf_alloc);
1032                 return -ENOMEM;
1033         }
1034         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1035
1036         entry->buf_size = size;
1037         entry->page_order = page_order;
1038
1039         offset = 0;
1040
1041         while (entry->buf_count < count) {
1042                 buf = &entry->buflist[entry->buf_count];
1043                 buf->idx = dma->buf_count + entry->buf_count;
1044                 buf->total = alignment;
1045                 buf->order = order;
1046                 buf->used = 0;
1047
1048                 buf->offset = (dma->byte_count + offset);
1049                 buf->bus_address = agp_offset + offset;
1050                 buf->address = (void *)(agp_offset + offset
1051                                         + (unsigned long)dev->sg->virtual);
1052                 buf->next = NULL;
1053                 buf->waiting = 0;
1054                 buf->pending = 0;
1055                 init_waitqueue_head(&buf->dma_wait);
1056                 buf->file_priv = NULL;
1057
1058                 buf->dev_priv_size = dev->driver->dev_priv_size;
1059                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1060                 if (!buf->dev_private) {
1061                         /* Set count correctly so we free the proper amount. */
1062                         entry->buf_count = count;
1063                         drm_cleanup_buf_error(dev, entry);
1064                         mutex_unlock(&dev->struct_mutex);
1065                         atomic_dec(&dev->buf_alloc);
1066                         return -ENOMEM;
1067                 }
1068
1069                 memset(buf->dev_private, 0, buf->dev_priv_size);
1070
1071                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1072
1073                 offset += alignment;
1074                 entry->buf_count++;
1075                 byte_count += PAGE_SIZE << page_order;
1076         }
1077
1078         DRM_DEBUG("byte_count: %d\n", byte_count);
1079
1080         temp_buflist = drm_realloc(dma->buflist,
1081                                    dma->buf_count * sizeof(*dma->buflist),
1082                                    (dma->buf_count + entry->buf_count)
1083                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1084         if (!temp_buflist) {
1085                 /* Free the entry because it isn't valid */
1086                 drm_cleanup_buf_error(dev, entry);
1087                 mutex_unlock(&dev->struct_mutex);
1088                 atomic_dec(&dev->buf_alloc);
1089                 return -ENOMEM;
1090         }
1091         dma->buflist = temp_buflist;
1092
1093         for (i = 0; i < entry->buf_count; i++) {
1094                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1095         }
1096
1097         dma->buf_count += entry->buf_count;
1098         dma->seg_count += entry->seg_count;
1099         dma->page_count += byte_count >> PAGE_SHIFT;
1100         dma->byte_count += byte_count;
1101
1102         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1103         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1104
1105         mutex_unlock(&dev->struct_mutex);
1106
1107         request->count = entry->buf_count;
1108         request->size = size;
1109
1110         dma->flags = _DRM_DMA_USE_SG;
1111
1112         atomic_dec(&dev->buf_alloc);
1113         return 0;
1114 }
1115
1116 int drm_addbufs_fb(struct drm_device *dev, struct drm_buf_desc *request)
1117 {
1118         struct drm_device_dma *dma = dev->dma;
1119         struct drm_buf_entry *entry;
1120         struct drm_buf *buf;
1121         unsigned long offset;
1122         unsigned long agp_offset;
1123         int count;
1124         int order;
1125         int size;
1126         int alignment;
1127         int page_order;
1128         int total;
1129         int byte_count;
1130         int i;
1131         struct drm_buf **temp_buflist;
1132
1133         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1134                 return -EINVAL;
1135
1136         if (!dma)
1137                 return -EINVAL;
1138
1139         if (!capable(CAP_SYS_ADMIN))
1140                 return -EPERM;
1141
1142         count = request->count;
1143         order = drm_order(request->size);
1144         size = 1 << order;
1145
1146         alignment = (request->flags & _DRM_PAGE_ALIGN)
1147             ? PAGE_ALIGN(size) : size;
1148         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1149         total = PAGE_SIZE << page_order;
1150
1151         byte_count = 0;
1152         agp_offset = request->agp_start;
1153
1154         DRM_DEBUG("count:      %d\n", count);
1155         DRM_DEBUG("order:      %d\n", order);
1156         DRM_DEBUG("size:       %d\n", size);
1157         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1158         DRM_DEBUG("alignment:  %d\n", alignment);
1159         DRM_DEBUG("page_order: %d\n", page_order);
1160         DRM_DEBUG("total:      %d\n", total);
1161
1162         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1163                 return -EINVAL;
1164         if (dev->queue_count)
1165                 return -EBUSY;  /* Not while in use */
1166
1167         spin_lock(&dev->count_lock);
1168         if (dev->buf_use) {
1169                 spin_unlock(&dev->count_lock);
1170                 return -EBUSY;
1171         }
1172         atomic_inc(&dev->buf_alloc);
1173         spin_unlock(&dev->count_lock);
1174
1175         mutex_lock(&dev->struct_mutex);
1176         entry = &dma->bufs[order];
1177         if (entry->buf_count) {
1178                 mutex_unlock(&dev->struct_mutex);
1179                 atomic_dec(&dev->buf_alloc);
1180                 return -ENOMEM; /* May only call once for each order */
1181         }
1182
1183         if (count < 0 || count > 4096) {
1184                 mutex_unlock(&dev->struct_mutex);
1185                 atomic_dec(&dev->buf_alloc);
1186                 return -EINVAL;
1187         }
1188
1189         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1190                                    DRM_MEM_BUFS);
1191         if (!entry->buflist) {
1192                 mutex_unlock(&dev->struct_mutex);
1193                 atomic_dec(&dev->buf_alloc);
1194                 return -ENOMEM;
1195         }
1196         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1197
1198         entry->buf_size = size;
1199         entry->page_order = page_order;
1200
1201         offset = 0;
1202
1203         while (entry->buf_count < count) {
1204                 buf = &entry->buflist[entry->buf_count];
1205                 buf->idx = dma->buf_count + entry->buf_count;
1206                 buf->total = alignment;
1207                 buf->order = order;
1208                 buf->used = 0;
1209
1210                 buf->offset = (dma->byte_count + offset);
1211                 buf->bus_address = agp_offset + offset;
1212                 buf->address = (void *)(agp_offset + offset);
1213                 buf->next = NULL;
1214                 buf->waiting = 0;
1215                 buf->pending = 0;
1216                 init_waitqueue_head(&buf->dma_wait);
1217                 buf->file_priv = NULL;
1218
1219                 buf->dev_priv_size = dev->driver->dev_priv_size;
1220                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1221                 if (!buf->dev_private) {
1222                         /* Set count correctly so we free the proper amount. */
1223                         entry->buf_count = count;
1224                         drm_cleanup_buf_error(dev, entry);
1225                         mutex_unlock(&dev->struct_mutex);
1226                         atomic_dec(&dev->buf_alloc);
1227                         return -ENOMEM;
1228                 }
1229                 memset(buf->dev_private, 0, buf->dev_priv_size);
1230
1231                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1232
1233                 offset += alignment;
1234                 entry->buf_count++;
1235                 byte_count += PAGE_SIZE << page_order;
1236         }
1237
1238         DRM_DEBUG("byte_count: %d\n", byte_count);
1239
1240         temp_buflist = drm_realloc(dma->buflist,
1241                                    dma->buf_count * sizeof(*dma->buflist),
1242                                    (dma->buf_count + entry->buf_count)
1243                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1244         if (!temp_buflist) {
1245                 /* Free the entry because it isn't valid */
1246                 drm_cleanup_buf_error(dev, entry);
1247                 mutex_unlock(&dev->struct_mutex);
1248                 atomic_dec(&dev->buf_alloc);
1249                 return -ENOMEM;
1250         }
1251         dma->buflist = temp_buflist;
1252
1253         for (i = 0; i < entry->buf_count; i++) {
1254                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1255         }
1256
1257         dma->buf_count += entry->buf_count;
1258         dma->seg_count += entry->seg_count;
1259         dma->page_count += byte_count >> PAGE_SHIFT;
1260         dma->byte_count += byte_count;
1261
1262         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1263         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1264
1265         mutex_unlock(&dev->struct_mutex);
1266
1267         request->count = entry->buf_count;
1268         request->size = size;
1269
1270         dma->flags = _DRM_DMA_USE_FB;
1271
1272         atomic_dec(&dev->buf_alloc);
1273         return 0;
1274 }
1275 EXPORT_SYMBOL(drm_addbufs_fb);
1276
1277
1278 /**
1279  * Add buffers for DMA transfers (ioctl).
1280  *
1281  * \param inode device inode.
1282  * \param file_priv DRM file private.
1283  * \param cmd command.
1284  * \param arg pointer to a struct drm_buf_desc request.
1285  * \return zero on success or a negative number on failure.
1286  *
1287  * According with the memory type specified in drm_buf_desc::flags and the
1288  * build options, it dispatches the call either to addbufs_agp(),
1289  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1290  * PCI memory respectively.
1291  */
1292 int drm_addbufs(struct drm_device *dev, void *data,
1293                 struct drm_file *file_priv)
1294 {
1295         struct drm_buf_desc *request = data;
1296         int ret;
1297
1298         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1299                 return -EINVAL;
1300
1301 #if __OS_HAS_AGP
1302         if (request->flags & _DRM_AGP_BUFFER)
1303                 ret = drm_addbufs_agp(dev, request);
1304         else
1305 #endif
1306         if (request->flags & _DRM_SG_BUFFER)
1307                 ret = drm_addbufs_sg(dev, request);
1308         else if (request->flags & _DRM_FB_BUFFER)
1309                 ret = drm_addbufs_fb(dev, request);
1310         else
1311                 ret = drm_addbufs_pci(dev, request);
1312
1313         return ret;
1314 }
1315
1316 /**
1317  * Get information about the buffer mappings.
1318  *
1319  * This was originally mean for debugging purposes, or by a sophisticated
1320  * client library to determine how best to use the available buffers (e.g.,
1321  * large buffers can be used for image transfer).
1322  *
1323  * \param inode device inode.
1324  * \param file_priv DRM file private.
1325  * \param cmd command.
1326  * \param arg pointer to a drm_buf_info structure.
1327  * \return zero on success or a negative number on failure.
1328  *
1329  * Increments drm_device::buf_use while holding the drm_device::count_lock
1330  * lock, preventing of allocating more buffers after this call. Information
1331  * about each requested buffer is then copied into user space.
1332  */
1333 int drm_infobufs(struct drm_device *dev, void *data,
1334                  struct drm_file *file_priv)
1335 {
1336         struct drm_device_dma *dma = dev->dma;
1337         struct drm_buf_info *request = data;
1338         int i;
1339         int count;
1340
1341         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1342                 return -EINVAL;
1343
1344         if (!dma)
1345                 return -EINVAL;
1346
1347         spin_lock(&dev->count_lock);
1348         if (atomic_read(&dev->buf_alloc)) {
1349                 spin_unlock(&dev->count_lock);
1350                 return -EBUSY;
1351         }
1352         ++dev->buf_use;         /* Can't allocate more after this call */
1353         spin_unlock(&dev->count_lock);
1354
1355         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1356                 if (dma->bufs[i].buf_count)
1357                         ++count;
1358         }
1359
1360         DRM_DEBUG("count = %d\n", count);
1361
1362         if (request->count >= count) {
1363                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1364                         if (dma->bufs[i].buf_count) {
1365                                 struct drm_buf_desc __user *to =
1366                                     &request->list[count];
1367                                 struct drm_buf_entry *from = &dma->bufs[i];
1368                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1369                                 if (copy_to_user(&to->count,
1370                                                  &from->buf_count,
1371                                                  sizeof(from->buf_count)) ||
1372                                     copy_to_user(&to->size,
1373                                                  &from->buf_size,
1374                                                  sizeof(from->buf_size)) ||
1375                                     copy_to_user(&to->low_mark,
1376                                                  &list->low_mark,
1377                                                  sizeof(list->low_mark)) ||
1378                                     copy_to_user(&to->high_mark,
1379                                                  &list->high_mark,
1380                                                  sizeof(list->high_mark)))
1381                                         return -EFAULT;
1382
1383                                 DRM_DEBUG("%d %d %d %d %d\n",
1384                                           i,
1385                                           dma->bufs[i].buf_count,
1386                                           dma->bufs[i].buf_size,
1387                                           dma->bufs[i].freelist.low_mark,
1388                                           dma->bufs[i].freelist.high_mark);
1389                                 ++count;
1390                         }
1391                 }
1392         }
1393         request->count = count;
1394
1395         return 0;
1396 }
1397
1398 /**
1399  * Specifies a low and high water mark for buffer allocation
1400  *
1401  * \param inode device inode.
1402  * \param file_priv DRM file private.
1403  * \param cmd command.
1404  * \param arg a pointer to a drm_buf_desc structure.
1405  * \return zero on success or a negative number on failure.
1406  *
1407  * Verifies that the size order is bounded between the admissible orders and
1408  * updates the respective drm_device_dma::bufs entry low and high water mark.
1409  *
1410  * \note This ioctl is deprecated and mostly never used.
1411  */
1412 int drm_markbufs(struct drm_device *dev, void *data,
1413                  struct drm_file *file_priv)
1414 {
1415         struct drm_device_dma *dma = dev->dma;
1416         struct drm_buf_desc *request = data;
1417         int order;
1418         struct drm_buf_entry *entry;
1419
1420         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1421                 return -EINVAL;
1422
1423         if (!dma)
1424                 return -EINVAL;
1425
1426         DRM_DEBUG("%d, %d, %d\n",
1427                   request->size, request->low_mark, request->high_mark);
1428         order = drm_order(request->size);
1429         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1430                 return -EINVAL;
1431         entry = &dma->bufs[order];
1432
1433         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1434                 return -EINVAL;
1435         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1436                 return -EINVAL;
1437
1438         entry->freelist.low_mark = request->low_mark;
1439         entry->freelist.high_mark = request->high_mark;
1440
1441         return 0;
1442 }
1443
1444 /**
1445  * Unreserve the buffers in list, previously reserved using drmDMA.
1446  *
1447  * \param inode device inode.
1448  * \param file_priv DRM file private.
1449  * \param cmd command.
1450  * \param arg pointer to a drm_buf_free structure.
1451  * \return zero on success or a negative number on failure.
1452  *
1453  * Calls free_buffer() for each used buffer.
1454  * This function is primarily used for debugging.
1455  */
1456 int drm_freebufs(struct drm_device *dev, void *data,
1457                  struct drm_file *file_priv)
1458 {
1459         struct drm_device_dma *dma = dev->dma;
1460         struct drm_buf_free *request = data;
1461         int i;
1462         int idx;
1463         struct drm_buf *buf;
1464
1465         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1466                 return -EINVAL;
1467
1468         if (!dma)
1469                 return -EINVAL;
1470
1471         DRM_DEBUG("%d\n", request->count);
1472         for (i = 0; i < request->count; i++) {
1473                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1474                         return -EFAULT;
1475                 if (idx < 0 || idx >= dma->buf_count) {
1476                         DRM_ERROR("Index %d (of %d max)\n",
1477                                   idx, dma->buf_count - 1);
1478                         return -EINVAL;
1479                 }
1480                 buf = dma->buflist[idx];
1481                 if (buf->file_priv != file_priv) {
1482                         DRM_ERROR("Process %d freeing buffer not owned\n",
1483                                   current->pid);
1484                         return -EINVAL;
1485                 }
1486                 drm_free_buffer(dev, buf);
1487         }
1488
1489         return 0;
1490 }
1491
1492 /**
1493  * Maps all of the DMA buffers into client-virtual space (ioctl).
1494  *
1495  * \param inode device inode.
1496  * \param file_priv DRM file private.
1497  * \param cmd command.
1498  * \param arg pointer to a drm_buf_map structure.
1499  * \return zero on success or a negative number on failure.
1500  *
1501  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1502  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1503  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1504  * drm_mmap_dma().
1505  */
1506 int drm_mapbufs(struct drm_device *dev, void *data,
1507                 struct drm_file *file_priv)
1508 {
1509         struct drm_device_dma *dma = dev->dma;
1510         int retcode = 0;
1511         const int zero = 0;
1512         unsigned long virtual;
1513         unsigned long address;
1514         struct drm_buf_map *request = data;
1515         int i;
1516
1517         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1518                 return -EINVAL;
1519
1520         if (!dma)
1521                 return -EINVAL;
1522
1523         spin_lock(&dev->count_lock);
1524         if (atomic_read(&dev->buf_alloc)) {
1525                 spin_unlock(&dev->count_lock);
1526                 return -EBUSY;
1527         }
1528         dev->buf_use++;         /* Can't allocate more after this call */
1529         spin_unlock(&dev->count_lock);
1530
1531         DRM_DEBUG("dma buf count %d, req count %d\n", request->count, dma->buf_count);
1532         if (request->count >= dma->buf_count) {
1533                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1534                     || (drm_core_check_feature(dev, DRIVER_SG)
1535                         && (dma->flags & _DRM_DMA_USE_SG))
1536                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1537                         && (dma->flags & _DRM_DMA_USE_FB))) {
1538                         struct drm_map *map = dev->agp_buffer_map;
1539                         unsigned long token = dev->agp_buffer_token;
1540
1541                         if (!map) {
1542                                 DRM_DEBUG("No map\n");
1543                                 retcode = -EINVAL;
1544                                 goto done;
1545                         }
1546                         down_write(&current->mm->mmap_sem);
1547                         virtual = do_mmap(file_priv->filp, 0, map->size,
1548                                           PROT_READ | PROT_WRITE,
1549                                           MAP_SHARED,
1550                                           token);
1551                         up_write(&current->mm->mmap_sem);
1552                 } else {
1553                         down_write(&current->mm->mmap_sem);
1554                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1555                                           PROT_READ | PROT_WRITE,
1556                                           MAP_SHARED, 0);
1557                         up_write(&current->mm->mmap_sem);
1558                 }
1559                 if (virtual > -1024UL) {
1560                         DRM_DEBUG("mmap failed\n");
1561                         /* Real error */
1562                         retcode = (signed long)virtual;
1563                         goto done;
1564                 }
1565                 request->virtual = (void __user *)virtual;
1566
1567                 for (i = 0; i < dma->buf_count; i++) {
1568                         if (copy_to_user(&request->list[i].idx,
1569                                          &dma->buflist[i]->idx,
1570                                          sizeof(request->list[0].idx))) {
1571                                 retcode = -EFAULT;
1572                                 goto done;
1573                         }
1574                         if (copy_to_user(&request->list[i].total,
1575                                          &dma->buflist[i]->total,
1576                                          sizeof(request->list[0].total))) {
1577                                 retcode = -EFAULT;
1578                                 goto done;
1579                         }
1580                         if (copy_to_user(&request->list[i].used,
1581                                          &zero, sizeof(zero))) {
1582                                 retcode = -EFAULT;
1583                                 goto done;
1584                         }
1585                         address = virtual + dma->buflist[i]->offset;    /* *** */
1586                         if (copy_to_user(&request->list[i].address,
1587                                          &address, sizeof(address))) {
1588                                 retcode = -EFAULT;
1589                                 goto done;
1590                         }
1591                 }
1592         }
1593       done:
1594         request->count = dma->buf_count;
1595         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1596
1597         return retcode;
1598 }
1599
1600 /**
1601  * Compute size order.  Returns the exponent of the smaller power of two which
1602  * is greater or equal to given number.
1603  *
1604  * \param size size.
1605  * \return order.
1606  *
1607  * \todo Can be made faster.
1608  */
1609 int drm_order(unsigned long size)
1610 {
1611         int order;
1612         unsigned long tmp;
1613
1614         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1615
1616         if (size & (size - 1))
1617                 ++order;
1618
1619         return order;
1620 }
1621 EXPORT_SYMBOL(drm_order);