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 resource_size_t 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 resource_size_t 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                                                   struct drm_local_map *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  * Core function to create a range of memory available for mapping by a
  93  * non-root process.
  94  *
  95  * Adjusts the memory offset to its absolute value according to the mapping
  96  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
  97  * applicable and if supported by the kernel.
  98  */
  99 static int drm_addmap_core(struct drm_device * dev, unsigned int offset,
 100                            unsigned int size, enum drm_map_type type,
 101                            enum drm_map_flags flags,
 102                            struct drm_map_list ** maplist)
 103 {
 104         struct drm_local_map *map;
 105         struct drm_map_list *list;
 106         drm_dma_handle_t *dmah;
 107         unsigned long user_token;
 108         int ret;
 109
 110         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
 111         if (!map)
 112                 return -ENOMEM;
 113
 114         map->offset = offset;
 115         map->size = size;
 116         map->flags = flags;
 117         map->type = type;
 118
 119         /* Only allow shared memory to be removable since we only keep enough
 120          * book keeping information about shared memory to allow for removal
 121          * when processes fork.
 122          */
 123         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 124                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 125                 return -EINVAL;
 126         }
 127         DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
 128                   map->offset, map->size, map->type);
 129         if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 130                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 131                 return -EINVAL;
 132         }
 133         map->mtrr = -1;
 134         map->handle = NULL;
 135
 136         switch (map->type) {
 137         case _DRM_REGISTERS:
 138         case _DRM_FRAME_BUFFER:
 139 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 140                 if (map->offset + (map->size-1) < map->offset ||
 141                     map->offset < virt_to_phys(high_memory)) {
 142                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 143                         return -EINVAL;
 144                 }
 145 #endif
 146 #ifdef __alpha__
 147                 map->offset += dev->hose->mem_space->start;
 148 #endif
 149                 /* Some drivers preinitialize some maps, without the X Server
 150                  * needing to be aware of it.  Therefore, we just return success
 151                  * when the server tries to create a duplicate map.
 152                  */
 153                 list = drm_find_matching_map(dev, map);
 154                 if (list != NULL) {
 155                         if (list->map->size != map->size) {
 156                                 DRM_DEBUG("Matching maps of type %d with "
 157                                           "mismatched sizes, (%ld vs %ld)\n",
 158                                           map->type, map->size,
 159                                           list->map->size);
 160                                 list->map->size = map->size;
 161                         }
 162
 163                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 164                         *maplist = list;
 165                         return 0;
 166                 }
 167
 168                 if (drm_core_has_MTRR(dev)) {
 169                         if (map->type == _DRM_FRAME_BUFFER ||
 170                             (map->flags & _DRM_WRITE_COMBINING)) {
 171                                 map->mtrr = mtrr_add(map->offset, map->size,
 172                                                      MTRR_TYPE_WRCOMB, 1);
 173                         }
 174                 }
 175                 if (map->type == _DRM_REGISTERS) {
 176                         map->handle = ioremap(map->offset, map->size);
 177                         if (!map->handle) {
 178                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 179                                 return -ENOMEM;
 180                         }
 181                 }
 182
 183                 break;
 184         case _DRM_SHM:
 185                 list = drm_find_matching_map(dev, map);
 186                 if (list != NULL) {
 187                         if(list->map->size != map->size) {
 188                                 DRM_DEBUG("Matching maps of type %d with "
 189                                           "mismatched sizes, (%ld vs %ld)\n",
 190                                           map->type, map->size, list->map->size);
 191                                 list->map->size = map->size;
 192                         }
 193
 194                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 195                         *maplist = list;
 196                         return 0;
 197                 }
 198                 map->handle = vmalloc_user(map->size);
 199                 DRM_DEBUG("%lu %d %p\n",
 200                           map->size, drm_order(map->size), map->handle);
 201                 if (!map->handle) {
 202                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 203                         return -ENOMEM;
 204                 }
 205                 map->offset = (unsigned long)map->handle;
 206                 if (map->flags & _DRM_CONTAINS_LOCK) {
 207                         /* Prevent a 2nd X Server from creating a 2nd lock */
 208                         if (dev->primary->master->lock.hw_lock != NULL) {
 209                                 vfree(map->handle);
 210                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 211                                 return -EBUSY;
 212                         }
 213                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 214                 }
 215                 break;
 216         case _DRM_AGP: {
 217                 struct drm_agp_mem *entry;
 218                 int valid = 0;
 219
 220                 if (!drm_core_has_AGP(dev)) {
 221                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 222                         return -EINVAL;
 223                 }
 224 #ifdef __alpha__
 225                 map->offset += dev->hose->mem_space->start;
 226 #endif
 227                 /* In some cases (i810 driver), user space may have already
 228                  * added the AGP base itself, because dev->agp->base previously
 229                  * only got set during AGP enable.  So, only add the base
 230                  * address if the map's offset isn't already within the
 231                  * aperture.
 232                  */
 233                 if (map->offset < dev->agp->base ||
 234                     map->offset > dev->agp->base +
 235                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 236                         map->offset += dev->agp->base;
 237                 }
 238                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 239
 240                 /* This assumes the DRM is in total control of AGP space.
 241                  * It's not always the case as AGP can be in the control
 242                  * of user space (i.e. i810 driver). So this loop will get
 243                  * skipped and we double check that dev->agp->memory is
 244                  * actually set as well as being invalid before EPERM'ing
 245                  */
 246                 list_for_each_entry(entry, &dev->agp->memory, head) {
 247                         if ((map->offset >= entry->bound) &&
 248                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 249                                 valid = 1;
 250                                 break;
 251                         }
 252                 }
 253                 if (!list_empty(&dev->agp->memory) && !valid) {
 254                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 255                         return -EPERM;
 256                 }
 257                 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
 258
 259                 break;
 260         case _DRM_GEM:
 261                 DRM_ERROR("tried to rmmap GEM object\n");
 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         /* We do it here so that dev->struct_mutex protects the increment */
 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         if (ret) {
 309                 if (map->type == _DRM_REGISTERS)
 310                         iounmap(map->handle);
 311                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 312                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 313                 mutex_unlock(&dev->struct_mutex);
 314                 return ret;
 315         }
 316
 317         list->user_token = list->hash.key << PAGE_SHIFT;
 318         mutex_unlock(&dev->struct_mutex);
 319
 320         list->master = dev->primary->master;
 321         *maplist = list;
 322         return 0;
 323         }
 324
 325 int drm_addmap(struct drm_device * dev, unsigned int offset,
 326                unsigned int size, enum drm_map_type type,
 327                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 328 {
 329         struct drm_map_list *list;
 330         int rc;
 331
 332         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 333         if (!rc)
 334                 *map_ptr = list->map;
 335         return rc;
 336 }
 337
 338 EXPORT_SYMBOL(drm_addmap);
 339
 340 /**
 341  * Ioctl to specify a range of memory that is available for mapping by a
 342  * non-root process.
 343  *
 344  * \param inode device inode.
 345  * \param file_priv DRM file private.
 346  * \param cmd command.
 347  * \param arg pointer to a drm_map structure.
 348  * \return zero on success or a negative value on error.
 349  *
 350  */
 351 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 352                      struct drm_file *file_priv)
 353 {
 354         struct drm_map *map = data;
 355         struct drm_map_list *maplist;
 356         int err;
 357
 358         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 359                 return -EPERM;
 360
 361         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 362                               map->flags, &maplist);
 363
 364         if (err)
 365                 return err;
 366
 367         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 368         map->handle = (void *)(unsigned long)maplist->user_token;
 369         return 0;
 370 }
 371
 372 /**
 373  * Remove a map private from list and deallocate resources if the mapping
 374  * isn't in use.
 375  *
 376  * Searches the map on drm_device::maplist, removes it from the list, see if
 377  * its being used, and free any associate resource (such as MTRR's) if it's not
 378  * being on use.
 379  *
 380  * \sa drm_addmap
 381  */
 382 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 383 {
 384         struct drm_map_list *r_list = NULL, *list_t;
 385         drm_dma_handle_t dmah;
 386         int found = 0;
 387         struct drm_master *master;
 388
 389         /* Find the list entry for the map and remove it */
 390         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 391                 if (r_list->map == map) {
 392                         master = r_list->master;
 393                         list_del(&r_list->head);
 394                         drm_ht_remove_key(&dev->map_hash,
 395                                           r_list->user_token >> PAGE_SHIFT);
 396                         drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
 397                         found = 1;
 398                         break;
 399                 }
 400         }
 401
 402         if (!found)
 403                 return -EINVAL;
 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_all(&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_GEM:
 436                 DRM_ERROR("tried to rmmap GEM object\n");
 437                 break;
 438         }
 439         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 440
 441         return 0;
 442 }
 443 EXPORT_SYMBOL(drm_rmmap_locked);
 444
 445 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 446 {
 447         int ret;
 448
 449         mutex_lock(&dev->struct_mutex);
 450         ret = drm_rmmap_locked(dev, map);
 451         mutex_unlock(&dev->struct_mutex);
 452
 453         return ret;
 454 }
 455 EXPORT_SYMBOL(drm_rmmap);
 456
 457 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 458  * the last close of the device, and this is necessary for cleanup when things
 459  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 460  * like a pointless exercise since they're going away anyway.
 461  *
 462  * One use case might be after addmap is allowed for normal users for SHM and
 463  * gets used by drivers that the server doesn't need to care about.  This seems
 464  * unlikely.
 465  *
 466  * \param inode device inode.
 467  * \param file_priv DRM file private.
 468  * \param cmd command.
 469  * \param arg pointer to a struct drm_map structure.
 470  * \return zero on success or a negative value on error.
 471  */
 472 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 473                     struct drm_file *file_priv)
 474 {
 475         struct drm_map *request = data;
 476         struct drm_local_map *map = NULL;
 477         struct drm_map_list *r_list;
 478         int ret;
 479
 480         mutex_lock(&dev->struct_mutex);
 481         list_for_each_entry(r_list, &dev->maplist, head) {
 482                 if (r_list->map &&
 483                     r_list->user_token == (unsigned long)request->handle &&
 484                     r_list->map->flags & _DRM_REMOVABLE) {
 485                         map = r_list->map;
 486                         break;
 487                 }
 488         }
 489
 490         /* List has wrapped around to the head pointer, or its empty we didn't
 491          * find anything.
 492          */
 493         if (list_empty(&dev->maplist) || !map) {
 494                 mutex_unlock(&dev->struct_mutex);
 495                 return -EINVAL;
 496         }
 497
 498         /* Register and framebuffer maps are permanent */
 499         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 500                 mutex_unlock(&dev->struct_mutex);
 501                 return 0;
 502         }
 503
 504         ret = drm_rmmap_locked(dev, map);
 505
 506         mutex_unlock(&dev->struct_mutex);
 507
 508         return ret;
 509 }
 510
 511 /**
 512  * Cleanup after an error on one of the addbufs() functions.
 513  *
 514  * \param dev DRM device.
 515  * \param entry buffer entry where the error occurred.
 516  *
 517  * Frees any pages and buffers associated with the given entry.
 518  */
 519 static void drm_cleanup_buf_error(struct drm_device * dev,
 520                                   struct drm_buf_entry * entry)
 521 {
 522         int i;
 523
 524         if (entry->seg_count) {
 525                 for (i = 0; i < entry->seg_count; i++) {
 526                         if (entry->seglist[i]) {
 527                                 drm_pci_free(dev, entry->seglist[i]);
 528                         }
 529                 }
 530                 drm_free(entry->seglist,
 531                          entry->seg_count *
 532                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 533
 534                 entry->seg_count = 0;
 535         }
 536
 537         if (entry->buf_count) {
 538                 for (i = 0; i < entry->buf_count; i++) {
 539                         if (entry->buflist[i].dev_private) {
 540                                 drm_free(entry->buflist[i].dev_private,
 541                                          entry->buflist[i].dev_priv_size,
 542                                          DRM_MEM_BUFS);
 543                         }
 544                 }
 545                 drm_free(entry->buflist,
 546                          entry->buf_count *
 547                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 548
 549                 entry->buf_count = 0;
 550         }
 551 }
 552
 553 #if __OS_HAS_AGP
 554 /**
 555  * Add AGP buffers for DMA transfers.
 556  *
 557  * \param dev struct drm_device to which the buffers are to be added.
 558  * \param request pointer to a struct drm_buf_desc describing the request.
 559  * \return zero on success or a negative number on failure.
 560  *
 561  * After some sanity checks creates a drm_buf structure for each buffer and
 562  * reallocates the buffer list of the same size order to accommodate the new
 563  * buffers.
 564  */
 565 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 566 {
 567         struct drm_device_dma *dma = dev->dma;
 568         struct drm_buf_entry *entry;
 569         struct drm_agp_mem *agp_entry;
 570         struct drm_buf *buf;
 571         unsigned long offset;
 572         unsigned long agp_offset;
 573         int count;
 574         int order;
 575         int size;
 576         int alignment;
 577         int page_order;
 578         int total;
 579         int byte_count;
 580         int i, valid;
 581         struct drm_buf **temp_buflist;
 582
 583         if (!dma)
 584                 return -EINVAL;
 585
 586         count = request->count;
 587         order = drm_order(request->size);
 588         size = 1 << order;
 589
 590         alignment = (request->flags & _DRM_PAGE_ALIGN)
 591             ? PAGE_ALIGN(size) : size;
 592         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 593         total = PAGE_SIZE << page_order;
 594
 595         byte_count = 0;
 596         agp_offset = dev->agp->base + request->agp_start;
 597
 598         DRM_DEBUG("count:      %d\n", count);
 599         DRM_DEBUG("order:      %d\n", order);
 600         DRM_DEBUG("size:       %d\n", size);
 601         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 602         DRM_DEBUG("alignment:  %d\n", alignment);
 603         DRM_DEBUG("page_order: %d\n", page_order);
 604         DRM_DEBUG("total:      %d\n", total);
 605
 606         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 607                 return -EINVAL;
 608         if (dev->queue_count)
 609                 return -EBUSY;  /* Not while in use */
 610
 611         /* Make sure buffers are located in AGP memory that we own */
 612         valid = 0;
 613         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 614                 if ((agp_offset >= agp_entry->bound) &&
 615                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 616                         valid = 1;
 617                         break;
 618                 }
 619         }
 620         if (!list_empty(&dev->agp->memory) && !valid) {
 621                 DRM_DEBUG("zone invalid\n");
 622                 return -EINVAL;
 623         }
 624         spin_lock(&dev->count_lock);
 625         if (dev->buf_use) {
 626                 spin_unlock(&dev->count_lock);
 627                 return -EBUSY;
 628         }
 629         atomic_inc(&dev->buf_alloc);
 630         spin_unlock(&dev->count_lock);
 631
 632         mutex_lock(&dev->struct_mutex);
 633         entry = &dma->bufs[order];
 634         if (entry->buf_count) {
 635                 mutex_unlock(&dev->struct_mutex);
 636                 atomic_dec(&dev->buf_alloc);
 637                 return -ENOMEM; /* May only call once for each order */
 638         }
 639
 640         if (count < 0 || count > 4096) {
 641                 mutex_unlock(&dev->struct_mutex);
 642                 atomic_dec(&dev->buf_alloc);
 643                 return -EINVAL;
 644         }
 645
 646         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 647                                    DRM_MEM_BUFS);
 648         if (!entry->buflist) {
 649                 mutex_unlock(&dev->struct_mutex);
 650                 atomic_dec(&dev->buf_alloc);
 651                 return -ENOMEM;
 652         }
 653         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 654
 655         entry->buf_size = size;
 656         entry->page_order = page_order;
 657
 658         offset = 0;
 659
 660         while (entry->buf_count < count) {
 661                 buf = &entry->buflist[entry->buf_count];
 662                 buf->idx = dma->buf_count + entry->buf_count;
 663                 buf->total = alignment;
 664                 buf->order = order;
 665                 buf->used = 0;
 666
 667                 buf->offset = (dma->byte_count + offset);
 668                 buf->bus_address = agp_offset + offset;
 669                 buf->address = (void *)(agp_offset + offset);
 670                 buf->next = NULL;
 671                 buf->waiting = 0;
 672                 buf->pending = 0;
 673                 init_waitqueue_head(&buf->dma_wait);
 674                 buf->file_priv = NULL;
 675
 676                 buf->dev_priv_size = dev->driver->dev_priv_size;
 677                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 678                 if (!buf->dev_private) {
 679                         /* Set count correctly so we free the proper amount. */
 680                         entry->buf_count = count;
 681                         drm_cleanup_buf_error(dev, entry);
 682                         mutex_unlock(&dev->struct_mutex);
 683                         atomic_dec(&dev->buf_alloc);
 684                         return -ENOMEM;
 685                 }
 686                 memset(buf->dev_private, 0, buf->dev_priv_size);
 687
 688                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 689
 690                 offset += alignment;
 691                 entry->buf_count++;
 692                 byte_count += PAGE_SIZE << page_order;
 693         }
 694
 695         DRM_DEBUG("byte_count: %d\n", byte_count);
 696
 697         temp_buflist = drm_realloc(dma->buflist,
 698                                    dma->buf_count * sizeof(*dma->buflist),
 699                                    (dma->buf_count + entry->buf_count)
 700                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 701         if (!temp_buflist) {
 702                 /* Free the entry because it isn't valid */
 703                 drm_cleanup_buf_error(dev, entry);
 704                 mutex_unlock(&dev->struct_mutex);
 705                 atomic_dec(&dev->buf_alloc);
 706                 return -ENOMEM;
 707         }
 708         dma->buflist = temp_buflist;
 709
 710         for (i = 0; i < entry->buf_count; i++) {
 711                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 712         }
 713
 714         dma->buf_count += entry->buf_count;
 715         dma->seg_count += entry->seg_count;
 716         dma->page_count += byte_count >> PAGE_SHIFT;
 717         dma->byte_count += byte_count;
 718
 719         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 720         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 721
 722         mutex_unlock(&dev->struct_mutex);
 723
 724         request->count = entry->buf_count;
 725         request->size = size;
 726
 727         dma->flags = _DRM_DMA_USE_AGP;
 728
 729         atomic_dec(&dev->buf_alloc);
 730         return 0;
 731 }
 732 EXPORT_SYMBOL(drm_addbufs_agp);
 733 #endif                          /* __OS_HAS_AGP */
 734
 735 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 736 {
 737         struct drm_device_dma *dma = dev->dma;
 738         int count;
 739         int order;
 740         int size;
 741         int total;
 742         int page_order;
 743         struct drm_buf_entry *entry;
 744         drm_dma_handle_t *dmah;
 745         struct drm_buf *buf;
 746         int alignment;
 747         unsigned long offset;
 748         int i;
 749         int byte_count;
 750         int page_count;
 751         unsigned long *temp_pagelist;
 752         struct drm_buf **temp_buflist;
 753
 754         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 755                 return -EINVAL;
 756
 757         if (!dma)
 758                 return -EINVAL;
 759
 760         if (!capable(CAP_SYS_ADMIN))
 761                 return -EPERM;
 762
 763         count = request->count;
 764         order = drm_order(request->size);
 765         size = 1 << order;
 766
 767         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 768                   request->count, request->size, size, order, dev->queue_count);
 769
 770         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 771                 return -EINVAL;
 772         if (dev->queue_count)
 773                 return -EBUSY;  /* Not while in use */
 774
 775         alignment = (request->flags & _DRM_PAGE_ALIGN)
 776             ? PAGE_ALIGN(size) : size;
 777         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 778         total = PAGE_SIZE << page_order;
 779
 780         spin_lock(&dev->count_lock);
 781         if (dev->buf_use) {
 782                 spin_unlock(&dev->count_lock);
 783                 return -EBUSY;
 784         }
 785         atomic_inc(&dev->buf_alloc);
 786         spin_unlock(&dev->count_lock);
 787
 788         mutex_lock(&dev->struct_mutex);
 789         entry = &dma->bufs[order];
 790         if (entry->buf_count) {
 791                 mutex_unlock(&dev->struct_mutex);
 792                 atomic_dec(&dev->buf_alloc);
 793                 return -ENOMEM; /* May only call once for each order */
 794         }
 795
 796         if (count < 0 || count > 4096) {
 797                 mutex_unlock(&dev->struct_mutex);
 798                 atomic_dec(&dev->buf_alloc);
 799                 return -EINVAL;
 800         }
 801
 802         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 803                                    DRM_MEM_BUFS);
 804         if (!entry->buflist) {
 805                 mutex_unlock(&dev->struct_mutex);
 806                 atomic_dec(&dev->buf_alloc);
 807                 return -ENOMEM;
 808         }
 809         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 810
 811         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 812                                    DRM_MEM_SEGS);
 813         if (!entry->seglist) {
 814                 drm_free(entry->buflist,
 815                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 816                 mutex_unlock(&dev->struct_mutex);
 817                 atomic_dec(&dev->buf_alloc);
 818                 return -ENOMEM;
 819         }
 820         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 821
 822         /* Keep the original pagelist until we know all the allocations
 823          * have succeeded
 824          */
 825         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 826                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 827         if (!temp_pagelist) {
 828                 drm_free(entry->buflist,
 829                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 830                 drm_free(entry->seglist,
 831                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 832                 mutex_unlock(&dev->struct_mutex);
 833                 atomic_dec(&dev->buf_alloc);
 834                 return -ENOMEM;
 835         }
 836         memcpy(temp_pagelist,
 837                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 838         DRM_DEBUG("pagelist: %d entries\n",
 839                   dma->page_count + (count << page_order));
 840
 841         entry->buf_size = size;
 842         entry->page_order = page_order;
 843         byte_count = 0;
 844         page_count = 0;
 845
 846         while (entry->buf_count < count) {
 847
 848                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 849
 850                 if (!dmah) {
 851                         /* Set count correctly so we free the proper amount. */
 852                         entry->buf_count = count;
 853                         entry->seg_count = count;
 854                         drm_cleanup_buf_error(dev, entry);
 855                         drm_free(temp_pagelist,
 856                                  (dma->page_count + (count << page_order))
 857                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 858                         mutex_unlock(&dev->struct_mutex);
 859                         atomic_dec(&dev->buf_alloc);
 860                         return -ENOMEM;
 861                 }
 862                 entry->seglist[entry->seg_count++] = dmah;
 863                 for (i = 0; i < (1 << page_order); i++) {
 864                         DRM_DEBUG("page %d @ 0x%08lx\n",
 865                                   dma->page_count + page_count,
 866                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 867                         temp_pagelist[dma->page_count + page_count++]
 868                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 869                 }
 870                 for (offset = 0;
 871                      offset + size <= total && entry->buf_count < count;
 872                      offset += alignment, ++entry->buf_count) {
 873                         buf = &entry->buflist[entry->buf_count];
 874                         buf->idx = dma->buf_count + entry->buf_count;
 875                         buf->total = alignment;
 876                         buf->order = order;
 877                         buf->used = 0;
 878                         buf->offset = (dma->byte_count + byte_count + offset);
 879                         buf->address = (void *)(dmah->vaddr + offset);
 880                         buf->bus_address = dmah->busaddr + offset;
 881                         buf->next = NULL;
 882                         buf->waiting = 0;
 883                         buf->pending = 0;
 884                         init_waitqueue_head(&buf->dma_wait);
 885                         buf->file_priv = NULL;
 886
 887                         buf->dev_priv_size = dev->driver->dev_priv_size;
 888                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 889                                                      DRM_MEM_BUFS);
 890                         if (!buf->dev_private) {
 891                                 /* Set count correctly so we free the proper amount. */
 892                                 entry->buf_count = count;
 893                                 entry->seg_count = count;
 894                                 drm_cleanup_buf_error(dev, entry);
 895                                 drm_free(temp_pagelist,
 896                                          (dma->page_count +
 897                                           (count << page_order))
 898                                          * sizeof(*dma->pagelist),
 899                                          DRM_MEM_PAGES);
 900                                 mutex_unlock(&dev->struct_mutex);
 901                                 atomic_dec(&dev->buf_alloc);
 902                                 return -ENOMEM;
 903                         }
 904                         memset(buf->dev_private, 0, buf->dev_priv_size);
 905
 906                         DRM_DEBUG("buffer %d @ %p\n",
 907                                   entry->buf_count, buf->address);
 908                 }
 909                 byte_count += PAGE_SIZE << page_order;
 910         }
 911
 912         temp_buflist = drm_realloc(dma->buflist,
 913                                    dma->buf_count * sizeof(*dma->buflist),
 914                                    (dma->buf_count + entry->buf_count)
 915                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 916         if (!temp_buflist) {
 917                 /* Free the entry because it isn't valid */
 918                 drm_cleanup_buf_error(dev, entry);
 919                 drm_free(temp_pagelist,
 920                          (dma->page_count + (count << page_order))
 921                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 922                 mutex_unlock(&dev->struct_mutex);
 923                 atomic_dec(&dev->buf_alloc);
 924                 return -ENOMEM;
 925         }
 926         dma->buflist = temp_buflist;
 927
 928         for (i = 0; i < entry->buf_count; i++) {
 929                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 930         }
 931
 932         /* No allocations failed, so now we can replace the orginal pagelist
 933          * with the new one.
 934          */
 935         if (dma->page_count) {
 936                 drm_free(dma->pagelist,
 937                          dma->page_count * sizeof(*dma->pagelist),
 938                          DRM_MEM_PAGES);
 939         }
 940         dma->pagelist = temp_pagelist;
 941
 942         dma->buf_count += entry->buf_count;
 943         dma->seg_count += entry->seg_count;
 944         dma->page_count += entry->seg_count << page_order;
 945         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 946
 947         mutex_unlock(&dev->struct_mutex);
 948
 949         request->count = entry->buf_count;
 950         request->size = size;
 951
 952         if (request->flags & _DRM_PCI_BUFFER_RO)
 953                 dma->flags = _DRM_DMA_USE_PCI_RO;
 954
 955         atomic_dec(&dev->buf_alloc);
 956         return 0;
 957
 958 }
 959 EXPORT_SYMBOL(drm_addbufs_pci);
 960
 961 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 962 {
 963         struct drm_device_dma *dma = dev->dma;
 964         struct drm_buf_entry *entry;
 965         struct drm_buf *buf;
 966         unsigned long offset;
 967         unsigned long agp_offset;
 968         int count;
 969         int order;
 970         int size;
 971         int alignment;
 972         int page_order;
 973         int total;
 974         int byte_count;
 975         int i;
 976         struct drm_buf **temp_buflist;
 977
 978         if (!drm_core_check_feature(dev, DRIVER_SG))
 979                 return -EINVAL;
 980
 981         if (!dma)
 982                 return -EINVAL;
 983
 984         if (!capable(CAP_SYS_ADMIN))
 985                 return -EPERM;
 986
 987         count = request->count;
 988         order = drm_order(request->size);
 989         size = 1 << order;
 990
 991         alignment = (request->flags & _DRM_PAGE_ALIGN)
 992             ? PAGE_ALIGN(size) : size;
 993         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 994         total = PAGE_SIZE << page_order;
 995
 996         byte_count = 0;
 997         agp_offset = request->agp_start;
 998
 999         DRM_DEBUG("count:      %d\n", count);
1000         DRM_DEBUG("order:      %d\n", order);
1001         DRM_DEBUG("size:       %d\n", size);
1002         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1003         DRM_DEBUG("alignment:  %d\n", alignment);
1004         DRM_DEBUG("page_order: %d\n", page_order);
1005         DRM_DEBUG("total:      %d\n", total);
1006
1007         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1008                 return -EINVAL;
1009         if (dev->queue_count)
1010                 return -EBUSY;  /* Not while in use */
1011
1012         spin_lock(&dev->count_lock);
1013         if (dev->buf_use) {
1014                 spin_unlock(&dev->count_lock);
1015                 return -EBUSY;
1016         }
1017         atomic_inc(&dev->buf_alloc);
1018         spin_unlock(&dev->count_lock);
1019
1020         mutex_lock(&dev->struct_mutex);
1021         entry = &dma->bufs[order];
1022         if (entry->buf_count) {
1023                 mutex_unlock(&dev->struct_mutex);
1024                 atomic_dec(&dev->buf_alloc);
1025                 return -ENOMEM; /* May only call once for each order */
1026         }
1027
1028         if (count < 0 || count > 4096) {
1029                 mutex_unlock(&dev->struct_mutex);
1030                 atomic_dec(&dev->buf_alloc);
1031                 return -EINVAL;
1032         }
1033
1034         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1035                                    DRM_MEM_BUFS);
1036         if (!entry->buflist) {
1037                 mutex_unlock(&dev->struct_mutex);
1038                 atomic_dec(&dev->buf_alloc);
1039                 return -ENOMEM;
1040         }
1041         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1042
1043         entry->buf_size = size;
1044         entry->page_order = page_order;
1045
1046         offset = 0;
1047
1048         while (entry->buf_count < count) {
1049                 buf = &entry->buflist[entry->buf_count];
1050                 buf->idx = dma->buf_count + entry->buf_count;
1051                 buf->total = alignment;
1052                 buf->order = order;
1053                 buf->used = 0;
1054
1055                 buf->offset = (dma->byte_count + offset);
1056                 buf->bus_address = agp_offset + offset;
1057                 buf->address = (void *)(agp_offset + offset
1058                                         + (unsigned long)dev->sg->virtual);
1059                 buf->next = NULL;
1060                 buf->waiting = 0;
1061                 buf->pending = 0;
1062                 init_waitqueue_head(&buf->dma_wait);
1063                 buf->file_priv = NULL;
1064
1065                 buf->dev_priv_size = dev->driver->dev_priv_size;
1066                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1067                 if (!buf->dev_private) {
1068                         /* Set count correctly so we free the proper amount. */
1069                         entry->buf_count = count;
1070                         drm_cleanup_buf_error(dev, entry);
1071                         mutex_unlock(&dev->struct_mutex);
1072                         atomic_dec(&dev->buf_alloc);
1073                         return -ENOMEM;
1074                 }
1075
1076                 memset(buf->dev_private, 0, buf->dev_priv_size);
1077
1078                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1079
1080                 offset += alignment;
1081                 entry->buf_count++;
1082                 byte_count += PAGE_SIZE << page_order;
1083         }
1084
1085         DRM_DEBUG("byte_count: %d\n", byte_count);
1086
1087         temp_buflist = drm_realloc(dma->buflist,
1088                                    dma->buf_count * sizeof(*dma->buflist),
1089                                    (dma->buf_count + entry->buf_count)
1090                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1091         if (!temp_buflist) {
1092                 /* Free the entry because it isn't valid */
1093                 drm_cleanup_buf_error(dev, entry);
1094                 mutex_unlock(&dev->struct_mutex);
1095                 atomic_dec(&dev->buf_alloc);
1096                 return -ENOMEM;
1097         }
1098         dma->buflist = temp_buflist;
1099
1100         for (i = 0; i < entry->buf_count; i++) {
1101                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1102         }
1103
1104         dma->buf_count += entry->buf_count;
1105         dma->seg_count += entry->seg_count;
1106         dma->page_count += byte_count >> PAGE_SHIFT;
1107         dma->byte_count += byte_count;
1108
1109         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1110         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1111
1112         mutex_unlock(&dev->struct_mutex);
1113
1114         request->count = entry->buf_count;
1115         request->size = size;
1116
1117         dma->flags = _DRM_DMA_USE_SG;
1118
1119         atomic_dec(&dev->buf_alloc);
1120         return 0;
1121 }
1122
1123 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1124 {
1125         struct drm_device_dma *dma = dev->dma;
1126         struct drm_buf_entry *entry;
1127         struct drm_buf *buf;
1128         unsigned long offset;
1129         unsigned long agp_offset;
1130         int count;
1131         int order;
1132         int size;
1133         int alignment;
1134         int page_order;
1135         int total;
1136         int byte_count;
1137         int i;
1138         struct drm_buf **temp_buflist;
1139
1140         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1141                 return -EINVAL;
1142
1143         if (!dma)
1144                 return -EINVAL;
1145
1146         if (!capable(CAP_SYS_ADMIN))
1147                 return -EPERM;
1148
1149         count = request->count;
1150         order = drm_order(request->size);
1151         size = 1 << order;
1152
1153         alignment = (request->flags & _DRM_PAGE_ALIGN)
1154             ? PAGE_ALIGN(size) : size;
1155         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1156         total = PAGE_SIZE << page_order;
1157
1158         byte_count = 0;
1159         agp_offset = request->agp_start;
1160
1161         DRM_DEBUG("count:      %d\n", count);
1162         DRM_DEBUG("order:      %d\n", order);
1163         DRM_DEBUG("size:       %d\n", size);
1164         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1165         DRM_DEBUG("alignment:  %d\n", alignment);
1166         DRM_DEBUG("page_order: %d\n", page_order);
1167         DRM_DEBUG("total:      %d\n", total);
1168
1169         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1170                 return -EINVAL;
1171         if (dev->queue_count)
1172                 return -EBUSY;  /* Not while in use */
1173
1174         spin_lock(&dev->count_lock);
1175         if (dev->buf_use) {
1176                 spin_unlock(&dev->count_lock);
1177                 return -EBUSY;
1178         }
1179         atomic_inc(&dev->buf_alloc);
1180         spin_unlock(&dev->count_lock);
1181
1182         mutex_lock(&dev->struct_mutex);
1183         entry = &dma->bufs[order];
1184         if (entry->buf_count) {
1185                 mutex_unlock(&dev->struct_mutex);
1186                 atomic_dec(&dev->buf_alloc);
1187                 return -ENOMEM; /* May only call once for each order */
1188         }
1189
1190         if (count < 0 || count > 4096) {
1191                 mutex_unlock(&dev->struct_mutex);
1192                 atomic_dec(&dev->buf_alloc);
1193                 return -EINVAL;
1194         }
1195
1196         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1197                                    DRM_MEM_BUFS);
1198         if (!entry->buflist) {
1199                 mutex_unlock(&dev->struct_mutex);
1200                 atomic_dec(&dev->buf_alloc);
1201                 return -ENOMEM;
1202         }
1203         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1204
1205         entry->buf_size = size;
1206         entry->page_order = page_order;
1207
1208         offset = 0;
1209
1210         while (entry->buf_count < count) {
1211                 buf = &entry->buflist[entry->buf_count];
1212                 buf->idx = dma->buf_count + entry->buf_count;
1213                 buf->total = alignment;
1214                 buf->order = order;
1215                 buf->used = 0;
1216
1217                 buf->offset = (dma->byte_count + offset);
1218                 buf->bus_address = agp_offset + offset;
1219                 buf->address = (void *)(agp_offset + offset);
1220                 buf->next = NULL;
1221                 buf->waiting = 0;
1222                 buf->pending = 0;
1223                 init_waitqueue_head(&buf->dma_wait);
1224                 buf->file_priv = NULL;
1225
1226                 buf->dev_priv_size = dev->driver->dev_priv_size;
1227                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1228                 if (!buf->dev_private) {
1229                         /* Set count correctly so we free the proper amount. */
1230                         entry->buf_count = count;
1231                         drm_cleanup_buf_error(dev, entry);
1232                         mutex_unlock(&dev->struct_mutex);
1233                         atomic_dec(&dev->buf_alloc);
1234                         return -ENOMEM;
1235                 }
1236                 memset(buf->dev_private, 0, buf->dev_priv_size);
1237
1238                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1239
1240                 offset += alignment;
1241                 entry->buf_count++;
1242                 byte_count += PAGE_SIZE << page_order;
1243         }
1244
1245         DRM_DEBUG("byte_count: %d\n", byte_count);
1246
1247         temp_buflist = drm_realloc(dma->buflist,
1248                                    dma->buf_count * sizeof(*dma->buflist),
1249                                    (dma->buf_count + entry->buf_count)
1250                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1251         if (!temp_buflist) {
1252                 /* Free the entry because it isn't valid */
1253                 drm_cleanup_buf_error(dev, entry);
1254                 mutex_unlock(&dev->struct_mutex);
1255                 atomic_dec(&dev->buf_alloc);
1256                 return -ENOMEM;
1257         }
1258         dma->buflist = temp_buflist;
1259
1260         for (i = 0; i < entry->buf_count; i++) {
1261                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1262         }
1263
1264         dma->buf_count += entry->buf_count;
1265         dma->seg_count += entry->seg_count;
1266         dma->page_count += byte_count >> PAGE_SHIFT;
1267         dma->byte_count += byte_count;
1268
1269         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1270         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1271
1272         mutex_unlock(&dev->struct_mutex);
1273
1274         request->count = entry->buf_count;
1275         request->size = size;
1276
1277         dma->flags = _DRM_DMA_USE_FB;
1278
1279         atomic_dec(&dev->buf_alloc);
1280         return 0;
1281 }
1282
1283
1284 /**
1285  * Add buffers for DMA transfers (ioctl).
1286  *
1287  * \param inode device inode.
1288  * \param file_priv DRM file private.
1289  * \param cmd command.
1290  * \param arg pointer to a struct drm_buf_desc request.
1291  * \return zero on success or a negative number on failure.
1292  *
1293  * According with the memory type specified in drm_buf_desc::flags and the
1294  * build options, it dispatches the call either to addbufs_agp(),
1295  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1296  * PCI memory respectively.
1297  */
1298 int drm_addbufs(struct drm_device *dev, void *data,
1299                 struct drm_file *file_priv)
1300 {
1301         struct drm_buf_desc *request = data;
1302         int ret;
1303
1304         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1305                 return -EINVAL;
1306
1307 #if __OS_HAS_AGP
1308         if (request->flags & _DRM_AGP_BUFFER)
1309                 ret = drm_addbufs_agp(dev, request);
1310         else
1311 #endif
1312         if (request->flags & _DRM_SG_BUFFER)
1313                 ret = drm_addbufs_sg(dev, request);
1314         else if (request->flags & _DRM_FB_BUFFER)
1315                 ret = drm_addbufs_fb(dev, request);
1316         else
1317                 ret = drm_addbufs_pci(dev, request);
1318
1319         return ret;
1320 }
1321
1322 /**
1323  * Get information about the buffer mappings.
1324  *
1325  * This was originally mean for debugging purposes, or by a sophisticated
1326  * client library to determine how best to use the available buffers (e.g.,
1327  * large buffers can be used for image transfer).
1328  *
1329  * \param inode device inode.
1330  * \param file_priv DRM file private.
1331  * \param cmd command.
1332  * \param arg pointer to a drm_buf_info structure.
1333  * \return zero on success or a negative number on failure.
1334  *
1335  * Increments drm_device::buf_use while holding the drm_device::count_lock
1336  * lock, preventing of allocating more buffers after this call. Information
1337  * about each requested buffer is then copied into user space.
1338  */
1339 int drm_infobufs(struct drm_device *dev, void *data,
1340                  struct drm_file *file_priv)
1341 {
1342         struct drm_device_dma *dma = dev->dma;
1343         struct drm_buf_info *request = data;
1344         int i;
1345         int count;
1346
1347         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1348                 return -EINVAL;
1349
1350         if (!dma)
1351                 return -EINVAL;
1352
1353         spin_lock(&dev->count_lock);
1354         if (atomic_read(&dev->buf_alloc)) {
1355                 spin_unlock(&dev->count_lock);
1356                 return -EBUSY;
1357         }
1358         ++dev->buf_use;         /* Can't allocate more after this call */
1359         spin_unlock(&dev->count_lock);
1360
1361         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1362                 if (dma->bufs[i].buf_count)
1363                         ++count;
1364         }
1365
1366         DRM_DEBUG("count = %d\n", count);
1367
1368         if (request->count >= count) {
1369                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1370                         if (dma->bufs[i].buf_count) {
1371                                 struct drm_buf_desc __user *to =
1372                                     &request->list[count];
1373                                 struct drm_buf_entry *from = &dma->bufs[i];
1374                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1375                                 if (copy_to_user(&to->count,
1376                                                  &from->buf_count,
1377                                                  sizeof(from->buf_count)) ||
1378                                     copy_to_user(&to->size,
1379                                                  &from->buf_size,
1380                                                  sizeof(from->buf_size)) ||
1381                                     copy_to_user(&to->low_mark,
1382                                                  &list->low_mark,
1383                                                  sizeof(list->low_mark)) ||
1384                                     copy_to_user(&to->high_mark,
1385                                                  &list->high_mark,
1386                                                  sizeof(list->high_mark)))
1387                                         return -EFAULT;
1388
1389                                 DRM_DEBUG("%d %d %d %d %d\n",
1390                                           i,
1391                                           dma->bufs[i].buf_count,
1392                                           dma->bufs[i].buf_size,
1393                                           dma->bufs[i].freelist.low_mark,
1394                                           dma->bufs[i].freelist.high_mark);
1395                                 ++count;
1396                         }
1397                 }
1398         }
1399         request->count = count;
1400
1401         return 0;
1402 }
1403
1404 /**
1405  * Specifies a low and high water mark for buffer allocation
1406  *
1407  * \param inode device inode.
1408  * \param file_priv DRM file private.
1409  * \param cmd command.
1410  * \param arg a pointer to a drm_buf_desc structure.
1411  * \return zero on success or a negative number on failure.
1412  *
1413  * Verifies that the size order is bounded between the admissible orders and
1414  * updates the respective drm_device_dma::bufs entry low and high water mark.
1415  *
1416  * \note This ioctl is deprecated and mostly never used.
1417  */
1418 int drm_markbufs(struct drm_device *dev, void *data,
1419                  struct drm_file *file_priv)
1420 {
1421         struct drm_device_dma *dma = dev->dma;
1422         struct drm_buf_desc *request = data;
1423         int order;
1424         struct drm_buf_entry *entry;
1425
1426         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1427                 return -EINVAL;
1428
1429         if (!dma)
1430                 return -EINVAL;
1431
1432         DRM_DEBUG("%d, %d, %d\n",
1433                   request->size, request->low_mark, request->high_mark);
1434         order = drm_order(request->size);
1435         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1436                 return -EINVAL;
1437         entry = &dma->bufs[order];
1438
1439         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1440                 return -EINVAL;
1441         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1442                 return -EINVAL;
1443
1444         entry->freelist.low_mark = request->low_mark;
1445         entry->freelist.high_mark = request->high_mark;
1446
1447         return 0;
1448 }
1449
1450 /**
1451  * Unreserve the buffers in list, previously reserved using drmDMA.
1452  *
1453  * \param inode device inode.
1454  * \param file_priv DRM file private.
1455  * \param cmd command.
1456  * \param arg pointer to a drm_buf_free structure.
1457  * \return zero on success or a negative number on failure.
1458  *
1459  * Calls free_buffer() for each used buffer.
1460  * This function is primarily used for debugging.
1461  */
1462 int drm_freebufs(struct drm_device *dev, void *data,
1463                  struct drm_file *file_priv)
1464 {
1465         struct drm_device_dma *dma = dev->dma;
1466         struct drm_buf_free *request = data;
1467         int i;
1468         int idx;
1469         struct drm_buf *buf;
1470
1471         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1472                 return -EINVAL;
1473
1474         if (!dma)
1475                 return -EINVAL;
1476
1477         DRM_DEBUG("%d\n", request->count);
1478         for (i = 0; i < request->count; i++) {
1479                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1480                         return -EFAULT;
1481                 if (idx < 0 || idx >= dma->buf_count) {
1482                         DRM_ERROR("Index %d (of %d max)\n",
1483                                   idx, dma->buf_count - 1);
1484                         return -EINVAL;
1485                 }
1486                 buf = dma->buflist[idx];
1487                 if (buf->file_priv != file_priv) {
1488                         DRM_ERROR("Process %d freeing buffer not owned\n",
1489                                   task_pid_nr(current));
1490                         return -EINVAL;
1491                 }
1492                 drm_free_buffer(dev, buf);
1493         }
1494
1495         return 0;
1496 }
1497
1498 /**
1499  * Maps all of the DMA buffers into client-virtual space (ioctl).
1500  *
1501  * \param inode device inode.
1502  * \param file_priv DRM file private.
1503  * \param cmd command.
1504  * \param arg pointer to a drm_buf_map structure.
1505  * \return zero on success or a negative number on failure.
1506  *
1507  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1508  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1509  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1510  * drm_mmap_dma().
1511  */
1512 int drm_mapbufs(struct drm_device *dev, void *data,
1513                 struct drm_file *file_priv)
1514 {
1515         struct drm_device_dma *dma = dev->dma;
1516         int retcode = 0;
1517         const int zero = 0;
1518         unsigned long virtual;
1519         unsigned long address;
1520         struct drm_buf_map *request = data;
1521         int i;
1522
1523         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1524                 return -EINVAL;
1525
1526         if (!dma)
1527                 return -EINVAL;
1528
1529         spin_lock(&dev->count_lock);
1530         if (atomic_read(&dev->buf_alloc)) {
1531                 spin_unlock(&dev->count_lock);
1532                 return -EBUSY;
1533         }
1534         dev->buf_use++;         /* Can't allocate more after this call */
1535         spin_unlock(&dev->count_lock);
1536
1537         if (request->count >= dma->buf_count) {
1538                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1539                     || (drm_core_check_feature(dev, DRIVER_SG)
1540                         && (dma->flags & _DRM_DMA_USE_SG))
1541                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1542                         && (dma->flags & _DRM_DMA_USE_FB))) {
1543                         struct drm_local_map *map = dev->agp_buffer_map;
1544                         unsigned long token = dev->agp_buffer_token;
1545
1546                         if (!map) {
1547                                 retcode = -EINVAL;
1548                                 goto done;
1549                         }
1550                         down_write(&current->mm->mmap_sem);
1551                         virtual = do_mmap(file_priv->filp, 0, map->size,
1552                                           PROT_READ | PROT_WRITE,
1553                                           MAP_SHARED,
1554                                           token);
1555                         up_write(&current->mm->mmap_sem);
1556                 } else {
1557                         down_write(&current->mm->mmap_sem);
1558                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1559                                           PROT_READ | PROT_WRITE,
1560                                           MAP_SHARED, 0);
1561                         up_write(&current->mm->mmap_sem);
1562                 }
1563                 if (virtual > -1024UL) {
1564                         /* Real error */
1565                         retcode = (signed long)virtual;
1566                         goto done;
1567                 }
1568                 request->virtual = (void __user *)virtual;
1569
1570                 for (i = 0; i < dma->buf_count; i++) {
1571                         if (copy_to_user(&request->list[i].idx,
1572                                          &dma->buflist[i]->idx,
1573                                          sizeof(request->list[0].idx))) {
1574                                 retcode = -EFAULT;
1575                                 goto done;
1576                         }
1577                         if (copy_to_user(&request->list[i].total,
1578                                          &dma->buflist[i]->total,
1579                                          sizeof(request->list[0].total))) {
1580                                 retcode = -EFAULT;
1581                                 goto done;
1582                         }
1583                         if (copy_to_user(&request->list[i].used,
1584                                          &zero, sizeof(zero))) {
1585                                 retcode = -EFAULT;
1586                                 goto done;
1587                         }
1588                         address = virtual + dma->buflist[i]->offset;    /* *** */
1589                         if (copy_to_user(&request->list[i].address,
1590                                          &address, sizeof(address))) {
1591                                 retcode = -EFAULT;
1592                                 goto done;
1593                         }
1594                 }
1595         }
1596       done:
1597         request->count = dma->buf_count;
1598         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1599
1600         return retcode;
1601 }
1602
1603 /**
1604  * Compute size order.  Returns the exponent of the smaller power of two which
1605  * is greater or equal to given number.
1606  *
1607  * \param size size.
1608  * \return order.
1609  *
1610  * \todo Can be made faster.
1611  */
1612 int drm_order(unsigned long size)
1613 {
1614         int order;
1615         unsigned long tmp;
1616
1617         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1618
1619         if (size & (size - 1))
1620                 ++order;
1621
1622         return order;
1623 }
1624 EXPORT_SYMBOL(drm_order);