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