drivers/gpu/drm/drm_bufs.c

   1 /**
   2  * \file drm_bufs.c
   3  * Generic buffer template
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
  11  *
  12  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
  13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14  * All Rights Reserved.
  15  *
  16  * Permission is hereby granted, free of charge, to any person obtaining a
  17  * copy of this software and associated documentation files (the "Software"),
  18  * to deal in the Software without restriction, including without limitation
  19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20  * and/or sell copies of the Software, and to permit persons to whom the
  21  * Software is furnished to do so, subject to the following conditions:
  22  *
  23  * The above copyright notice and this permission notice (including the next
  24  * paragraph) shall be included in all copies or substantial portions of the
  25  * Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33  * OTHER DEALINGS IN THE SOFTWARE.
  34  */
  35
  36 #include <linux/vmalloc.h>
  37 #include <linux/log2.h>
  38 #include <asm/shmparam.h>
  39 #include "drmP.h"
  40
  41 resource_size_t drm_get_resource_start(struct drm_device *dev, unsigned int resource)
  42 {
  43         return pci_resource_start(dev->pdev, resource);
  44 }
  45 EXPORT_SYMBOL(drm_get_resource_start);
  46
  47 resource_size_t drm_get_resource_len(struct drm_device *dev, unsigned int resource)
  48 {
  49         return pci_resource_len(dev->pdev, resource);
  50 }
  51
  52 EXPORT_SYMBOL(drm_get_resource_len);
  53
  54 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  55                                                   struct drm_local_map *map)
  56 {
  57         struct drm_map_list *entry;
  58         list_for_each_entry(entry, &dev->maplist, head) {
  59                 /*
  60                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  61                  * while PCI resources may live above that, we ignore the map
  62                  * offset for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  63                  * It is assumed that each driver will have only one resource of
  64                  * each type.
  65                  */
  66                 if (!entry->map ||
  67                     map->type != entry->map->type ||
  68                     entry->master != dev->primary->master)
  69                         continue;
  70                 switch (map->type) {
  71                 case _DRM_SHM:
  72                         if (map->flags != _DRM_CONTAINS_LOCK)
  73                                 break;
  74                 case _DRM_REGISTERS:
  75                 case _DRM_FRAME_BUFFER:
  76                         return entry;
  77                 default: /* Make gcc happy */
  78                         ;
  79                 }
  80                 if (entry->map->offset == map->offset)
  81                         return entry;
  82         }
  83
  84         return NULL;
  85 }
  86
  87 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  88                           unsigned long user_token, int hashed_handle, int shm)
  89 {
  90         int use_hashed_handle, shift;
  91         unsigned long add;
  92
  93 #if (BITS_PER_LONG == 64)
  94         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  95 #elif (BITS_PER_LONG == 32)
  96         use_hashed_handle = hashed_handle;
  97 #else
  98 #error Unsupported long size. Neither 64 nor 32 bits.
  99 #endif
 100
 101         if (!use_hashed_handle) {
 102                 int ret;
 103                 hash->key = user_token >> PAGE_SHIFT;
 104                 ret = drm_ht_insert_item(&dev->map_hash, hash);
 105                 if (ret != -EINVAL)
 106                         return ret;
 107         }
 108
 109         shift = 0;
 110         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 111         if (shm && (SHMLBA > PAGE_SIZE)) {
 112                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 113
 114                 /* For shared memory, we have to preserve the SHMLBA
 115                  * bits of the eventual vma->vm_pgoff value during
 116                  * mmap().  Otherwise we run into cache aliasing problems
 117                  * on some platforms.  On these platforms, the pgoff of
 118                  * a mmap() request is used to pick a suitable virtual
 119                  * address for the mmap() region such that it will not
 120                  * cause cache aliasing problems.
 121                  *
 122                  * Therefore, make sure the SHMLBA relevant bits of the
 123                  * hash value we use are equal to those in the original
 124                  * kernel virtual address.
 125                  */
 126                 shift = bits;
 127                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 128         }
 129
 130         return drm_ht_just_insert_please(&dev->map_hash, hash,
 131                                          user_token, 32 - PAGE_SHIFT - 3,
 132                                          shift, add);
 133 }
 134
 135 /**
 136  * Core function to create a range of memory available for mapping by a
 137  * non-root process.
 138  *
 139  * Adjusts the memory offset to its absolute value according to the mapping
 140  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 141  * applicable and if supported by the kernel.
 142  */
 143 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 144                            unsigned int size, enum drm_map_type type,
 145                            enum drm_map_flags flags,
 146                            struct drm_map_list ** maplist)
 147 {
 148         struct drm_local_map *map;
 149         struct drm_map_list *list;
 150         drm_dma_handle_t *dmah;
 151         unsigned long user_token;
 152         int ret;
 153
 154         map = kmalloc(sizeof(*map), GFP_KERNEL);
 155         if (!map)
 156                 return -ENOMEM;
 157
 158         map->offset = offset;
 159         map->size = size;
 160         map->flags = flags;
 161         map->type = type;
 162
 163         /* Only allow shared memory to be removable since we only keep enough
 164          * book keeping information about shared memory to allow for removal
 165          * when processes fork.
 166          */
 167         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 168                 kfree(map);
 169                 return -EINVAL;
 170         }
 171         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 172                   (unsigned long long)map->offset, map->size, map->type);
 173
 174         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 175          * hole created by that and it works around various broken drivers that use
 176          * a non-aligned quantity to map the SAREA. --BenH
 177          */
 178         if (map->type == _DRM_SHM)
 179                 map->size = PAGE_ALIGN(map->size);
 180
 181         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 182                 kfree(map);
 183                 return -EINVAL;
 184         }
 185         map->mtrr = -1;
 186         map->handle = NULL;
 187
 188         switch (map->type) {
 189         case _DRM_REGISTERS:
 190         case _DRM_FRAME_BUFFER:
 191 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 192                 if (map->offset + (map->size-1) < map->offset ||
 193                     map->offset < virt_to_phys(high_memory)) {
 194                         kfree(map);
 195                         return -EINVAL;
 196                 }
 197 #endif
 198 #ifdef __alpha__
 199                 map->offset += dev->hose->mem_space->start;
 200 #endif
 201                 /* Some drivers preinitialize some maps, without the X Server
 202                  * needing to be aware of it.  Therefore, we just return success
 203                  * when the server tries to create a duplicate map.
 204                  */
 205                 list = drm_find_matching_map(dev, map);
 206                 if (list != NULL) {
 207                         if (list->map->size != map->size) {
 208                                 DRM_DEBUG("Matching maps of type %d with "
 209                                           "mismatched sizes, (%ld vs %ld)\n",
 210                                           map->type, map->size,
 211                                           list->map->size);
 212                                 list->map->size = map->size;
 213                         }
 214
 215                         kfree(map);
 216                         *maplist = list;
 217                         return 0;
 218                 }
 219
 220                 if (drm_core_has_MTRR(dev)) {
 221                         if (map->type == _DRM_FRAME_BUFFER ||
 222                             (map->flags & _DRM_WRITE_COMBINING)) {
 223                                 map->mtrr = mtrr_add(map->offset, map->size,
 224                                                      MTRR_TYPE_WRCOMB, 1);
 225                         }
 226                 }
 227                 if (map->type == _DRM_REGISTERS) {
 228                         map->handle = ioremap(map->offset, map->size);
 229                         if (!map->handle) {
 230                                 kfree(map);
 231                                 return -ENOMEM;
 232                         }
 233                 }
 234
 235                 break;
 236         case _DRM_SHM:
 237                 list = drm_find_matching_map(dev, map);
 238                 if (list != NULL) {
 239                         if(list->map->size != map->size) {
 240                                 DRM_DEBUG("Matching maps of type %d with "
 241                                           "mismatched sizes, (%ld vs %ld)\n",
 242                                           map->type, map->size, list->map->size);
 243                                 list->map->size = map->size;
 244                         }
 245
 246                         kfree(map);
 247                         *maplist = list;
 248                         return 0;
 249                 }
 250                 map->handle = vmalloc_user(map->size);
 251                 DRM_DEBUG("%lu %d %p\n",
 252                           map->size, drm_order(map->size), map->handle);
 253                 if (!map->handle) {
 254                         kfree(map);
 255                         return -ENOMEM;
 256                 }
 257                 map->offset = (unsigned long)map->handle;
 258                 if (map->flags & _DRM_CONTAINS_LOCK) {
 259                         /* Prevent a 2nd X Server from creating a 2nd lock */
 260                         if (dev->primary->master->lock.hw_lock != NULL) {
 261                                 vfree(map->handle);
 262                                 kfree(map);
 263                                 return -EBUSY;
 264                         }
 265                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 266                 }
 267                 break;
 268         case _DRM_AGP: {
 269                 struct drm_agp_mem *entry;
 270                 int valid = 0;
 271
 272                 if (!drm_core_has_AGP(dev)) {
 273                         kfree(map);
 274                         return -EINVAL;
 275                 }
 276 #ifdef __alpha__
 277                 map->offset += dev->hose->mem_space->start;
 278 #endif
 279                 /* In some cases (i810 driver), user space may have already
 280                  * added the AGP base itself, because dev->agp->base previously
 281                  * only got set during AGP enable.  So, only add the base
 282                  * address if the map's offset isn't already within the
 283                  * aperture.
 284                  */
 285                 if (map->offset < dev->agp->base ||
 286                     map->offset > dev->agp->base +
 287                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 288                         map->offset += dev->agp->base;
 289                 }
 290                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 291
 292                 /* This assumes the DRM is in total control of AGP space.
 293                  * It's not always the case as AGP can be in the control
 294                  * of user space (i.e. i810 driver). So this loop will get
 295                  * skipped and we double check that dev->agp->memory is
 296                  * actually set as well as being invalid before EPERM'ing
 297                  */
 298                 list_for_each_entry(entry, &dev->agp->memory, head) {
 299                         if ((map->offset >= entry->bound) &&
 300                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 301                                 valid = 1;
 302                                 break;
 303                         }
 304                 }
 305                 if (!list_empty(&dev->agp->memory) && !valid) {
 306                         kfree(map);
 307                         return -EPERM;
 308                 }
 309                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 310                           (unsigned long long)map->offset, map->size);
 311
 312                 break;
 313         case _DRM_GEM:
 314                 DRM_ERROR("tried to rmmap GEM object\n");
 315                 break;
 316         }
 317         case _DRM_SCATTER_GATHER:
 318                 if (!dev->sg) {
 319                         kfree(map);
 320                         return -EINVAL;
 321                 }
 322                 map->offset += (unsigned long)dev->sg->virtual;
 323                 break;
 324         case _DRM_CONSISTENT:
 325                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 326                  * As we're limiting the address to 2^32-1 (or less),
 327                  * casting it down to 32 bits is no problem, but we
 328                  * need to point to a 64bit variable first. */
 329                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 330                 if (!dmah) {
 331                         kfree(map);
 332                         return -ENOMEM;
 333                 }
 334                 map->handle = dmah->vaddr;
 335                 map->offset = (unsigned long)dmah->busaddr;
 336                 kfree(dmah);
 337                 break;
 338         default:
 339                 kfree(map);
 340                 return -EINVAL;
 341         }
 342
 343         list = kmalloc(sizeof(*list), GFP_KERNEL);
 344         if (!list) {
 345                 if (map->type == _DRM_REGISTERS)
 346                         iounmap(map->handle);
 347                 kfree(map);
 348                 return -EINVAL;
 349         }
 350         memset(list, 0, sizeof(*list));
 351         list->map = map;
 352
 353         mutex_lock(&dev->struct_mutex);
 354         list_add(&list->head, &dev->maplist);
 355
 356         /* Assign a 32-bit handle */
 357         /* We do it here so that dev->struct_mutex protects the increment */
 358         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 359                 map->offset;
 360         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 361                              (map->type == _DRM_SHM));
 362         if (ret) {
 363                 if (map->type == _DRM_REGISTERS)
 364                         iounmap(map->handle);
 365                 kfree(map);
 366                 kfree(list);
 367                 mutex_unlock(&dev->struct_mutex);
 368                 return ret;
 369         }
 370
 371         list->user_token = list->hash.key << PAGE_SHIFT;
 372         mutex_unlock(&dev->struct_mutex);
 373
 374         if (!(map->flags & _DRM_DRIVER))
 375                 list->master = dev->primary->master;
 376         *maplist = list;
 377         return 0;
 378         }
 379
 380 int drm_addmap(struct drm_device * dev, resource_size_t offset,
 381                unsigned int size, enum drm_map_type type,
 382                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 383 {
 384         struct drm_map_list *list;
 385         int rc;
 386
 387         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 388         if (!rc)
 389                 *map_ptr = list->map;
 390         return rc;
 391 }
 392
 393 EXPORT_SYMBOL(drm_addmap);
 394
 395 /**
 396  * Ioctl to specify a range of memory that is available for mapping by a
 397  * non-root process.
 398  *
 399  * \param inode device inode.
 400  * \param file_priv DRM file private.
 401  * \param cmd command.
 402  * \param arg pointer to a drm_map structure.
 403  * \return zero on success or a negative value on error.
 404  *
 405  */
 406 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 407                      struct drm_file *file_priv)
 408 {
 409         struct drm_map *map = data;
 410         struct drm_map_list *maplist;
 411         int err;
 412
 413         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 414                 return -EPERM;
 415
 416         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 417                               map->flags, &maplist);
 418
 419         if (err)
 420                 return err;
 421
 422         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 423         map->handle = (void *)(unsigned long)maplist->user_token;
 424         return 0;
 425 }
 426
 427 /**
 428  * Remove a map private from list and deallocate resources if the mapping
 429  * isn't in use.
 430  *
 431  * Searches the map on drm_device::maplist, removes it from the list, see if
 432  * its being used, and free any associate resource (such as MTRR's) if it's not
 433  * being on use.
 434  *
 435  * \sa drm_addmap
 436  */
 437 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 438 {
 439         struct drm_map_list *r_list = NULL, *list_t;
 440         drm_dma_handle_t dmah;
 441         int found = 0;
 442         struct drm_master *master;
 443
 444         /* Find the list entry for the map and remove it */
 445         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 446                 if (r_list->map == map) {
 447                         master = r_list->master;
 448                         list_del(&r_list->head);
 449                         drm_ht_remove_key(&dev->map_hash,
 450                                           r_list->user_token >> PAGE_SHIFT);
 451                         kfree(r_list);
 452                         found = 1;
 453                         break;
 454                 }
 455         }
 456
 457         if (!found)
 458                 return -EINVAL;
 459
 460         switch (map->type) {
 461         case _DRM_REGISTERS:
 462                 iounmap(map->handle);
 463                 /* FALLTHROUGH */
 464         case _DRM_FRAME_BUFFER:
 465                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 466                         int retcode;
 467                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 468                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 469                 }
 470                 break;
 471         case _DRM_SHM:
 472                 vfree(map->handle);
 473                 if (master) {
 474                         if (dev->sigdata.lock == master->lock.hw_lock)
 475                                 dev->sigdata.lock = NULL;
 476                         master->lock.hw_lock = NULL;   /* SHM removed */
 477                         master->lock.file_priv = NULL;
 478                         wake_up_interruptible_all(&master->lock.lock_queue);
 479                 }
 480                 break;
 481         case _DRM_AGP:
 482         case _DRM_SCATTER_GATHER:
 483                 break;
 484         case _DRM_CONSISTENT:
 485                 dmah.vaddr = map->handle;
 486                 dmah.busaddr = map->offset;
 487                 dmah.size = map->size;
 488                 __drm_pci_free(dev, &dmah);
 489                 break;
 490         case _DRM_GEM:
 491                 DRM_ERROR("tried to rmmap GEM object\n");
 492                 break;
 493         }
 494         kfree(map);
 495
 496         return 0;
 497 }
 498 EXPORT_SYMBOL(drm_rmmap_locked);
 499
 500 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 501 {
 502         int ret;
 503
 504         mutex_lock(&dev->struct_mutex);
 505         ret = drm_rmmap_locked(dev, map);
 506         mutex_unlock(&dev->struct_mutex);
 507
 508         return ret;
 509 }
 510 EXPORT_SYMBOL(drm_rmmap);
 511
 512 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 513  * the last close of the device, and this is necessary for cleanup when things
 514  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 515  * like a pointless exercise since they're going away anyway.
 516  *
 517  * One use case might be after addmap is allowed for normal users for SHM and
 518  * gets used by drivers that the server doesn't need to care about.  This seems
 519  * unlikely.
 520  *
 521  * \param inode device inode.
 522  * \param file_priv DRM file private.
 523  * \param cmd command.
 524  * \param arg pointer to a struct drm_map structure.
 525  * \return zero on success or a negative value on error.
 526  */
 527 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 528                     struct drm_file *file_priv)
 529 {
 530         struct drm_map *request = data;
 531         struct drm_local_map *map = NULL;
 532         struct drm_map_list *r_list;
 533         int ret;
 534
 535         mutex_lock(&dev->struct_mutex);
 536         list_for_each_entry(r_list, &dev->maplist, head) {
 537                 if (r_list->map &&
 538                     r_list->user_token == (unsigned long)request->handle &&
 539                     r_list->map->flags & _DRM_REMOVABLE) {
 540                         map = r_list->map;
 541                         break;
 542                 }
 543         }
 544
 545         /* List has wrapped around to the head pointer, or its empty we didn't
 546          * find anything.
 547          */
 548         if (list_empty(&dev->maplist) || !map) {
 549                 mutex_unlock(&dev->struct_mutex);
 550                 return -EINVAL;
 551         }
 552
 553         /* Register and framebuffer maps are permanent */
 554         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 555                 mutex_unlock(&dev->struct_mutex);
 556                 return 0;
 557         }
 558
 559         ret = drm_rmmap_locked(dev, map);
 560
 561         mutex_unlock(&dev->struct_mutex);
 562
 563         return ret;
 564 }
 565
 566 /**
 567  * Cleanup after an error on one of the addbufs() functions.
 568  *
 569  * \param dev DRM device.
 570  * \param entry buffer entry where the error occurred.
 571  *
 572  * Frees any pages and buffers associated with the given entry.
 573  */
 574 static void drm_cleanup_buf_error(struct drm_device * dev,
 575                                   struct drm_buf_entry * entry)
 576 {
 577         int i;
 578
 579         if (entry->seg_count) {
 580                 for (i = 0; i < entry->seg_count; i++) {
 581                         if (entry->seglist[i]) {
 582                                 drm_pci_free(dev, entry->seglist[i]);
 583                         }
 584                 }
 585                 kfree(entry->seglist);
 586
 587                 entry->seg_count = 0;
 588         }
 589
 590         if (entry->buf_count) {
 591                 for (i = 0; i < entry->buf_count; i++) {
 592                         kfree(entry->buflist[i].dev_private);
 593                 }
 594                 kfree(entry->buflist);
 595
 596                 entry->buf_count = 0;
 597         }
 598 }
 599
 600 #if __OS_HAS_AGP
 601 /**
 602  * Add AGP buffers for DMA transfers.
 603  *
 604  * \param dev struct drm_device to which the buffers are to be added.
 605  * \param request pointer to a struct drm_buf_desc describing the request.
 606  * \return zero on success or a negative number on failure.
 607  *
 608  * After some sanity checks creates a drm_buf structure for each buffer and
 609  * reallocates the buffer list of the same size order to accommodate the new
 610  * buffers.
 611  */
 612 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 613 {
 614         struct drm_device_dma *dma = dev->dma;
 615         struct drm_buf_entry *entry;
 616         struct drm_agp_mem *agp_entry;
 617         struct drm_buf *buf;
 618         unsigned long offset;
 619         unsigned long agp_offset;
 620         int count;
 621         int order;
 622         int size;
 623         int alignment;
 624         int page_order;
 625         int total;
 626         int byte_count;
 627         int i, valid;
 628         struct drm_buf **temp_buflist;
 629
 630         if (!dma)
 631                 return -EINVAL;
 632
 633         count = request->count;
 634         order = drm_order(request->size);
 635         size = 1 << order;
 636
 637         alignment = (request->flags & _DRM_PAGE_ALIGN)
 638             ? PAGE_ALIGN(size) : size;
 639         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 640         total = PAGE_SIZE << page_order;
 641
 642         byte_count = 0;
 643         agp_offset = dev->agp->base + request->agp_start;
 644
 645         DRM_DEBUG("count:      %d\n", count);
 646         DRM_DEBUG("order:      %d\n", order);
 647         DRM_DEBUG("size:       %d\n", size);
 648         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 649         DRM_DEBUG("alignment:  %d\n", alignment);
 650         DRM_DEBUG("page_order: %d\n", page_order);
 651         DRM_DEBUG("total:      %d\n", total);
 652
 653         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 654                 return -EINVAL;
 655         if (dev->queue_count)
 656                 return -EBUSY;  /* Not while in use */
 657
 658         /* Make sure buffers are located in AGP memory that we own */
 659         valid = 0;
 660         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 661                 if ((agp_offset >= agp_entry->bound) &&
 662                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 663                         valid = 1;
 664                         break;
 665                 }
 666         }
 667         if (!list_empty(&dev->agp->memory) && !valid) {
 668                 DRM_DEBUG("zone invalid\n");
 669                 return -EINVAL;
 670         }
 671         spin_lock(&dev->count_lock);
 672         if (dev->buf_use) {
 673                 spin_unlock(&dev->count_lock);
 674                 return -EBUSY;
 675         }
 676         atomic_inc(&dev->buf_alloc);
 677         spin_unlock(&dev->count_lock);
 678
 679         mutex_lock(&dev->struct_mutex);
 680         entry = &dma->bufs[order];
 681         if (entry->buf_count) {
 682                 mutex_unlock(&dev->struct_mutex);
 683                 atomic_dec(&dev->buf_alloc);
 684                 return -ENOMEM; /* May only call once for each order */
 685         }
 686
 687         if (count < 0 || count > 4096) {
 688                 mutex_unlock(&dev->struct_mutex);
 689                 atomic_dec(&dev->buf_alloc);
 690                 return -EINVAL;
 691         }
 692
 693         entry->buflist = kmalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 694         if (!entry->buflist) {
 695                 mutex_unlock(&dev->struct_mutex);
 696                 atomic_dec(&dev->buf_alloc);
 697                 return -ENOMEM;
 698         }
 699         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 700
 701         entry->buf_size = size;
 702         entry->page_order = page_order;
 703
 704         offset = 0;
 705
 706         while (entry->buf_count < count) {
 707                 buf = &entry->buflist[entry->buf_count];
 708                 buf->idx = dma->buf_count + entry->buf_count;
 709                 buf->total = alignment;
 710                 buf->order = order;
 711                 buf->used = 0;
 712
 713                 buf->offset = (dma->byte_count + offset);
 714                 buf->bus_address = agp_offset + offset;
 715                 buf->address = (void *)(agp_offset + offset);
 716                 buf->next = NULL;
 717                 buf->waiting = 0;
 718                 buf->pending = 0;
 719                 init_waitqueue_head(&buf->dma_wait);
 720                 buf->file_priv = NULL;
 721
 722                 buf->dev_priv_size = dev->driver->dev_priv_size;
 723                 buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL);
 724                 if (!buf->dev_private) {
 725                         /* Set count correctly so we free the proper amount. */
 726                         entry->buf_count = count;
 727                         drm_cleanup_buf_error(dev, entry);
 728                         mutex_unlock(&dev->struct_mutex);
 729                         atomic_dec(&dev->buf_alloc);
 730                         return -ENOMEM;
 731                 }
 732                 memset(buf->dev_private, 0, buf->dev_priv_size);
 733
 734                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 735
 736                 offset += alignment;
 737                 entry->buf_count++;
 738                 byte_count += PAGE_SIZE << page_order;
 739         }
 740
 741         DRM_DEBUG("byte_count: %d\n", byte_count);
 742
 743         temp_buflist = krealloc(dma->buflist,
 744                                 (dma->buf_count + entry->buf_count) *
 745                                 sizeof(*dma->buflist), GFP_KERNEL);
 746         if (!temp_buflist) {
 747                 /* Free the entry because it isn't valid */
 748                 drm_cleanup_buf_error(dev, entry);
 749                 mutex_unlock(&dev->struct_mutex);
 750                 atomic_dec(&dev->buf_alloc);
 751                 return -ENOMEM;
 752         }
 753         dma->buflist = temp_buflist;
 754
 755         for (i = 0; i < entry->buf_count; i++) {
 756                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 757         }
 758
 759         dma->buf_count += entry->buf_count;
 760         dma->seg_count += entry->seg_count;
 761         dma->page_count += byte_count >> PAGE_SHIFT;
 762         dma->byte_count += byte_count;
 763
 764         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 765         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 766
 767         mutex_unlock(&dev->struct_mutex);
 768
 769         request->count = entry->buf_count;
 770         request->size = size;
 771
 772         dma->flags = _DRM_DMA_USE_AGP;
 773
 774         atomic_dec(&dev->buf_alloc);
 775         return 0;
 776 }
 777 EXPORT_SYMBOL(drm_addbufs_agp);
 778 #endif                          /* __OS_HAS_AGP */
 779
 780 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 781 {
 782         struct drm_device_dma *dma = dev->dma;
 783         int count;
 784         int order;
 785         int size;
 786         int total;
 787         int page_order;
 788         struct drm_buf_entry *entry;
 789         drm_dma_handle_t *dmah;
 790         struct drm_buf *buf;
 791         int alignment;
 792         unsigned long offset;
 793         int i;
 794         int byte_count;
 795         int page_count;
 796         unsigned long *temp_pagelist;
 797         struct drm_buf **temp_buflist;
 798
 799         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 800                 return -EINVAL;
 801
 802         if (!dma)
 803                 return -EINVAL;
 804
 805         if (!capable(CAP_SYS_ADMIN))
 806                 return -EPERM;
 807
 808         count = request->count;
 809         order = drm_order(request->size);
 810         size = 1 << order;
 811
 812         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 813                   request->count, request->size, size, order, dev->queue_count);
 814
 815         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 816                 return -EINVAL;
 817         if (dev->queue_count)
 818                 return -EBUSY;  /* Not while in use */
 819
 820         alignment = (request->flags & _DRM_PAGE_ALIGN)
 821             ? PAGE_ALIGN(size) : size;
 822         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 823         total = PAGE_SIZE << page_order;
 824
 825         spin_lock(&dev->count_lock);
 826         if (dev->buf_use) {
 827                 spin_unlock(&dev->count_lock);
 828                 return -EBUSY;
 829         }
 830         atomic_inc(&dev->buf_alloc);
 831         spin_unlock(&dev->count_lock);
 832
 833         mutex_lock(&dev->struct_mutex);
 834         entry = &dma->bufs[order];
 835         if (entry->buf_count) {
 836                 mutex_unlock(&dev->struct_mutex);
 837                 atomic_dec(&dev->buf_alloc);
 838                 return -ENOMEM; /* May only call once for each order */
 839         }
 840
 841         if (count < 0 || count > 4096) {
 842                 mutex_unlock(&dev->struct_mutex);
 843                 atomic_dec(&dev->buf_alloc);
 844                 return -EINVAL;
 845         }
 846
 847         entry->buflist = kmalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 848         if (!entry->buflist) {
 849                 mutex_unlock(&dev->struct_mutex);
 850                 atomic_dec(&dev->buf_alloc);
 851                 return -ENOMEM;
 852         }
 853         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 854
 855         entry->seglist = kmalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
 856         if (!entry->seglist) {
 857                 kfree(entry->buflist);
 858                 mutex_unlock(&dev->struct_mutex);
 859                 atomic_dec(&dev->buf_alloc);
 860                 return -ENOMEM;
 861         }
 862         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 863
 864         /* Keep the original pagelist until we know all the allocations
 865          * have succeeded
 866          */
 867         temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
 868                                sizeof(*dma->pagelist), GFP_KERNEL);
 869         if (!temp_pagelist) {
 870                 kfree(entry->buflist);
 871                 kfree(entry->seglist);
 872                 mutex_unlock(&dev->struct_mutex);
 873                 atomic_dec(&dev->buf_alloc);
 874                 return -ENOMEM;
 875         }
 876         memcpy(temp_pagelist,
 877                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 878         DRM_DEBUG("pagelist: %d entries\n",
 879                   dma->page_count + (count << page_order));
 880
 881         entry->buf_size = size;
 882         entry->page_order = page_order;
 883         byte_count = 0;
 884         page_count = 0;
 885
 886         while (entry->buf_count < count) {
 887
 888                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 889
 890                 if (!dmah) {
 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                         kfree(temp_pagelist);
 896                         mutex_unlock(&dev->struct_mutex);
 897                         atomic_dec(&dev->buf_alloc);
 898                         return -ENOMEM;
 899                 }
 900                 entry->seglist[entry->seg_count++] = dmah;
 901                 for (i = 0; i < (1 << page_order); i++) {
 902                         DRM_DEBUG("page %d @ 0x%08lx\n",
 903                                   dma->page_count + page_count,
 904                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 905                         temp_pagelist[dma->page_count + page_count++]
 906                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 907                 }
 908                 for (offset = 0;
 909                      offset + size <= total && entry->buf_count < count;
 910                      offset += alignment, ++entry->buf_count) {
 911                         buf = &entry->buflist[entry->buf_count];
 912                         buf->idx = dma->buf_count + entry->buf_count;
 913                         buf->total = alignment;
 914                         buf->order = order;
 915                         buf->used = 0;
 916                         buf->offset = (dma->byte_count + byte_count + offset);
 917                         buf->address = (void *)(dmah->vaddr + offset);
 918                         buf->bus_address = dmah->busaddr + offset;
 919                         buf->next = NULL;
 920                         buf->waiting = 0;
 921                         buf->pending = 0;
 922                         init_waitqueue_head(&buf->dma_wait);
 923                         buf->file_priv = NULL;
 924
 925                         buf->dev_priv_size = dev->driver->dev_priv_size;
 926                         buf->dev_private = kmalloc(buf->dev_priv_size,
 927                                                   GFP_KERNEL);
 928                         if (!buf->dev_private) {
 929                                 /* Set count correctly so we free the proper amount. */
 930                                 entry->buf_count = count;
 931                                 entry->seg_count = count;
 932                                 drm_cleanup_buf_error(dev, entry);
 933                                 kfree(temp_pagelist);
 934                                 mutex_unlock(&dev->struct_mutex);
 935                                 atomic_dec(&dev->buf_alloc);
 936                                 return -ENOMEM;
 937                         }
 938                         memset(buf->dev_private, 0, buf->dev_priv_size);
 939
 940                         DRM_DEBUG("buffer %d @ %p\n",
 941                                   entry->buf_count, buf->address);
 942                 }
 943                 byte_count += PAGE_SIZE << page_order;
 944         }
 945
 946         temp_buflist = krealloc(dma->buflist,
 947                                 (dma->buf_count + entry->buf_count) *
 948                                 sizeof(*dma->buflist), GFP_KERNEL);
 949         if (!temp_buflist) {
 950                 /* Free the entry because it isn't valid */
 951                 drm_cleanup_buf_error(dev, entry);
 952                 kfree(temp_pagelist);
 953                 mutex_unlock(&dev->struct_mutex);
 954                 atomic_dec(&dev->buf_alloc);
 955                 return -ENOMEM;
 956         }
 957         dma->buflist = temp_buflist;
 958
 959         for (i = 0; i < entry->buf_count; i++) {
 960                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 961         }
 962
 963         /* No allocations failed, so now we can replace the orginal pagelist
 964          * with the new one.
 965          */
 966         if (dma->page_count) {
 967                 kfree(dma->pagelist);
 968         }
 969         dma->pagelist = temp_pagelist;
 970
 971         dma->buf_count += entry->buf_count;
 972         dma->seg_count += entry->seg_count;
 973         dma->page_count += entry->seg_count << page_order;
 974         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 975
 976         mutex_unlock(&dev->struct_mutex);
 977
 978         request->count = entry->buf_count;
 979         request->size = size;
 980
 981         if (request->flags & _DRM_PCI_BUFFER_RO)
 982                 dma->flags = _DRM_DMA_USE_PCI_RO;
 983
 984         atomic_dec(&dev->buf_alloc);
 985         return 0;
 986
 987 }
 988 EXPORT_SYMBOL(drm_addbufs_pci);
 989
 990 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 991 {
 992         struct drm_device_dma *dma = dev->dma;
 993         struct drm_buf_entry *entry;
 994         struct drm_buf *buf;
 995         unsigned long offset;
 996         unsigned long agp_offset;
 997         int count;
 998         int order;
 999         int size;
1000         int alignment;
1001         int page_order;
1002         int total;
1003         int byte_count;
1004         int i;
1005         struct drm_buf **temp_buflist;
1006
1007         if (!drm_core_check_feature(dev, DRIVER_SG))
1008                 return -EINVAL;
1009
1010         if (!dma)
1011                 return -EINVAL;
1012
1013         if (!capable(CAP_SYS_ADMIN))
1014                 return -EPERM;
1015
1016         count = request->count;
1017         order = drm_order(request->size);
1018         size = 1 << order;
1019
1020         alignment = (request->flags & _DRM_PAGE_ALIGN)
1021             ? PAGE_ALIGN(size) : size;
1022         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1023         total = PAGE_SIZE << page_order;
1024
1025         byte_count = 0;
1026         agp_offset = request->agp_start;
1027
1028         DRM_DEBUG("count:      %d\n", count);
1029         DRM_DEBUG("order:      %d\n", order);
1030         DRM_DEBUG("size:       %d\n", size);
1031         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1032         DRM_DEBUG("alignment:  %d\n", alignment);
1033         DRM_DEBUG("page_order: %d\n", page_order);
1034         DRM_DEBUG("total:      %d\n", total);
1035
1036         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1037                 return -EINVAL;
1038         if (dev->queue_count)
1039                 return -EBUSY;  /* Not while in use */
1040
1041         spin_lock(&dev->count_lock);
1042         if (dev->buf_use) {
1043                 spin_unlock(&dev->count_lock);
1044                 return -EBUSY;
1045         }
1046         atomic_inc(&dev->buf_alloc);
1047         spin_unlock(&dev->count_lock);
1048
1049         mutex_lock(&dev->struct_mutex);
1050         entry = &dma->bufs[order];
1051         if (entry->buf_count) {
1052                 mutex_unlock(&dev->struct_mutex);
1053                 atomic_dec(&dev->buf_alloc);
1054                 return -ENOMEM; /* May only call once for each order */
1055         }
1056
1057         if (count < 0 || count > 4096) {
1058                 mutex_unlock(&dev->struct_mutex);
1059                 atomic_dec(&dev->buf_alloc);
1060                 return -EINVAL;
1061         }
1062
1063         entry->buflist = kmalloc(count * sizeof(*entry->buflist),
1064                                 GFP_KERNEL);
1065         if (!entry->buflist) {
1066                 mutex_unlock(&dev->struct_mutex);
1067                 atomic_dec(&dev->buf_alloc);
1068                 return -ENOMEM;
1069         }
1070         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1071
1072         entry->buf_size = size;
1073         entry->page_order = page_order;
1074
1075         offset = 0;
1076
1077         while (entry->buf_count < count) {
1078                 buf = &entry->buflist[entry->buf_count];
1079                 buf->idx = dma->buf_count + entry->buf_count;
1080                 buf->total = alignment;
1081                 buf->order = order;
1082                 buf->used = 0;
1083
1084                 buf->offset = (dma->byte_count + offset);
1085                 buf->bus_address = agp_offset + offset;
1086                 buf->address = (void *)(agp_offset + offset
1087                                         + (unsigned long)dev->sg->virtual);
1088                 buf->next = NULL;
1089                 buf->waiting = 0;
1090                 buf->pending = 0;
1091                 init_waitqueue_head(&buf->dma_wait);
1092                 buf->file_priv = NULL;
1093
1094                 buf->dev_priv_size = dev->driver->dev_priv_size;
1095                 buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL);
1096                 if (!buf->dev_private) {
1097                         /* Set count correctly so we free the proper amount. */
1098                         entry->buf_count = count;
1099                         drm_cleanup_buf_error(dev, entry);
1100                         mutex_unlock(&dev->struct_mutex);
1101                         atomic_dec(&dev->buf_alloc);
1102                         return -ENOMEM;
1103                 }
1104
1105                 memset(buf->dev_private, 0, buf->dev_priv_size);
1106
1107                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1108
1109                 offset += alignment;
1110                 entry->buf_count++;
1111                 byte_count += PAGE_SIZE << page_order;
1112         }
1113
1114         DRM_DEBUG("byte_count: %d\n", byte_count);
1115
1116         temp_buflist = krealloc(dma->buflist,
1117                                 (dma->buf_count + entry->buf_count) *
1118                                 sizeof(*dma->buflist), GFP_KERNEL);
1119         if (!temp_buflist) {
1120                 /* Free the entry because it isn't valid */
1121                 drm_cleanup_buf_error(dev, entry);
1122                 mutex_unlock(&dev->struct_mutex);
1123                 atomic_dec(&dev->buf_alloc);
1124                 return -ENOMEM;
1125         }
1126         dma->buflist = temp_buflist;
1127
1128         for (i = 0; i < entry->buf_count; i++) {
1129                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1130         }
1131
1132         dma->buf_count += entry->buf_count;
1133         dma->seg_count += entry->seg_count;
1134         dma->page_count += byte_count >> PAGE_SHIFT;
1135         dma->byte_count += byte_count;
1136
1137         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1138         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1139
1140         mutex_unlock(&dev->struct_mutex);
1141
1142         request->count = entry->buf_count;
1143         request->size = size;
1144
1145         dma->flags = _DRM_DMA_USE_SG;
1146
1147         atomic_dec(&dev->buf_alloc);
1148         return 0;
1149 }
1150
1151 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1152 {
1153         struct drm_device_dma *dma = dev->dma;
1154         struct drm_buf_entry *entry;
1155         struct drm_buf *buf;
1156         unsigned long offset;
1157         unsigned long agp_offset;
1158         int count;
1159         int order;
1160         int size;
1161         int alignment;
1162         int page_order;
1163         int total;
1164         int byte_count;
1165         int i;
1166         struct drm_buf **temp_buflist;
1167
1168         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1169                 return -EINVAL;
1170
1171         if (!dma)
1172                 return -EINVAL;
1173
1174         if (!capable(CAP_SYS_ADMIN))
1175                 return -EPERM;
1176
1177         count = request->count;
1178         order = drm_order(request->size);
1179         size = 1 << order;
1180
1181         alignment = (request->flags & _DRM_PAGE_ALIGN)
1182             ? PAGE_ALIGN(size) : size;
1183         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1184         total = PAGE_SIZE << page_order;
1185
1186         byte_count = 0;
1187         agp_offset = request->agp_start;
1188
1189         DRM_DEBUG("count:      %d\n", count);
1190         DRM_DEBUG("order:      %d\n", order);
1191         DRM_DEBUG("size:       %d\n", size);
1192         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1193         DRM_DEBUG("alignment:  %d\n", alignment);
1194         DRM_DEBUG("page_order: %d\n", page_order);
1195         DRM_DEBUG("total:      %d\n", total);
1196
1197         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1198                 return -EINVAL;
1199         if (dev->queue_count)
1200                 return -EBUSY;  /* Not while in use */
1201
1202         spin_lock(&dev->count_lock);
1203         if (dev->buf_use) {
1204                 spin_unlock(&dev->count_lock);
1205                 return -EBUSY;
1206         }
1207         atomic_inc(&dev->buf_alloc);
1208         spin_unlock(&dev->count_lock);
1209
1210         mutex_lock(&dev->struct_mutex);
1211         entry = &dma->bufs[order];
1212         if (entry->buf_count) {
1213                 mutex_unlock(&dev->struct_mutex);
1214                 atomic_dec(&dev->buf_alloc);
1215                 return -ENOMEM; /* May only call once for each order */
1216         }
1217
1218         if (count < 0 || count > 4096) {
1219                 mutex_unlock(&dev->struct_mutex);
1220                 atomic_dec(&dev->buf_alloc);
1221                 return -EINVAL;
1222         }
1223
1224         entry->buflist = kmalloc(count * sizeof(*entry->buflist),
1225                                 GFP_KERNEL);
1226         if (!entry->buflist) {
1227                 mutex_unlock(&dev->struct_mutex);
1228                 atomic_dec(&dev->buf_alloc);
1229                 return -ENOMEM;
1230         }
1231         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1232
1233         entry->buf_size = size;
1234         entry->page_order = page_order;
1235
1236         offset = 0;
1237
1238         while (entry->buf_count < count) {
1239                 buf = &entry->buflist[entry->buf_count];
1240                 buf->idx = dma->buf_count + entry->buf_count;
1241                 buf->total = alignment;
1242                 buf->order = order;
1243                 buf->used = 0;
1244
1245                 buf->offset = (dma->byte_count + offset);
1246                 buf->bus_address = agp_offset + offset;
1247                 buf->address = (void *)(agp_offset + offset);
1248                 buf->next = NULL;
1249                 buf->waiting = 0;
1250                 buf->pending = 0;
1251                 init_waitqueue_head(&buf->dma_wait);
1252                 buf->file_priv = NULL;
1253
1254                 buf->dev_priv_size = dev->driver->dev_priv_size;
1255                 buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL);
1256                 if (!buf->dev_private) {
1257                         /* Set count correctly so we free the proper amount. */
1258                         entry->buf_count = count;
1259                         drm_cleanup_buf_error(dev, entry);
1260                         mutex_unlock(&dev->struct_mutex);
1261                         atomic_dec(&dev->buf_alloc);
1262                         return -ENOMEM;
1263                 }
1264                 memset(buf->dev_private, 0, buf->dev_priv_size);
1265
1266                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1267
1268                 offset += alignment;
1269                 entry->buf_count++;
1270                 byte_count += PAGE_SIZE << page_order;
1271         }
1272
1273         DRM_DEBUG("byte_count: %d\n", byte_count);
1274
1275         temp_buflist = krealloc(dma->buflist,
1276                                 (dma->buf_count + entry->buf_count) *
1277                                 sizeof(*dma->buflist), GFP_KERNEL);
1278         if (!temp_buflist) {
1279                 /* Free the entry because it isn't valid */
1280                 drm_cleanup_buf_error(dev, entry);
1281                 mutex_unlock(&dev->struct_mutex);
1282                 atomic_dec(&dev->buf_alloc);
1283                 return -ENOMEM;
1284         }
1285         dma->buflist = temp_buflist;
1286
1287         for (i = 0; i < entry->buf_count; i++) {
1288                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1289         }
1290
1291         dma->buf_count += entry->buf_count;
1292         dma->seg_count += entry->seg_count;
1293         dma->page_count += byte_count >> PAGE_SHIFT;
1294         dma->byte_count += byte_count;
1295
1296         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1297         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1298
1299         mutex_unlock(&dev->struct_mutex);
1300
1301         request->count = entry->buf_count;
1302         request->size = size;
1303
1304         dma->flags = _DRM_DMA_USE_FB;
1305
1306         atomic_dec(&dev->buf_alloc);
1307         return 0;
1308 }
1309
1310
1311 /**
1312  * Add buffers for DMA transfers (ioctl).
1313  *
1314  * \param inode device inode.
1315  * \param file_priv DRM file private.
1316  * \param cmd command.
1317  * \param arg pointer to a struct drm_buf_desc request.
1318  * \return zero on success or a negative number on failure.
1319  *
1320  * According with the memory type specified in drm_buf_desc::flags and the
1321  * build options, it dispatches the call either to addbufs_agp(),
1322  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1323  * PCI memory respectively.
1324  */
1325 int drm_addbufs(struct drm_device *dev, void *data,
1326                 struct drm_file *file_priv)
1327 {
1328         struct drm_buf_desc *request = data;
1329         int ret;
1330
1331         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1332                 return -EINVAL;
1333
1334 #if __OS_HAS_AGP
1335         if (request->flags & _DRM_AGP_BUFFER)
1336                 ret = drm_addbufs_agp(dev, request);
1337         else
1338 #endif
1339         if (request->flags & _DRM_SG_BUFFER)
1340                 ret = drm_addbufs_sg(dev, request);
1341         else if (request->flags & _DRM_FB_BUFFER)
1342                 ret = drm_addbufs_fb(dev, request);
1343         else
1344                 ret = drm_addbufs_pci(dev, request);
1345
1346         return ret;
1347 }
1348
1349 /**
1350  * Get information about the buffer mappings.
1351  *
1352  * This was originally mean for debugging purposes, or by a sophisticated
1353  * client library to determine how best to use the available buffers (e.g.,
1354  * large buffers can be used for image transfer).
1355  *
1356  * \param inode device inode.
1357  * \param file_priv DRM file private.
1358  * \param cmd command.
1359  * \param arg pointer to a drm_buf_info structure.
1360  * \return zero on success or a negative number on failure.
1361  *
1362  * Increments drm_device::buf_use while holding the drm_device::count_lock
1363  * lock, preventing of allocating more buffers after this call. Information
1364  * about each requested buffer is then copied into user space.
1365  */
1366 int drm_infobufs(struct drm_device *dev, void *data,
1367                  struct drm_file *file_priv)
1368 {
1369         struct drm_device_dma *dma = dev->dma;
1370         struct drm_buf_info *request = data;
1371         int i;
1372         int count;
1373
1374         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1375                 return -EINVAL;
1376
1377         if (!dma)
1378                 return -EINVAL;
1379
1380         spin_lock(&dev->count_lock);
1381         if (atomic_read(&dev->buf_alloc)) {
1382                 spin_unlock(&dev->count_lock);
1383                 return -EBUSY;
1384         }
1385         ++dev->buf_use;         /* Can't allocate more after this call */
1386         spin_unlock(&dev->count_lock);
1387
1388         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1389                 if (dma->bufs[i].buf_count)
1390                         ++count;
1391         }
1392
1393         DRM_DEBUG("count = %d\n", count);
1394
1395         if (request->count >= count) {
1396                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1397                         if (dma->bufs[i].buf_count) {
1398                                 struct drm_buf_desc __user *to =
1399                                     &request->list[count];
1400                                 struct drm_buf_entry *from = &dma->bufs[i];
1401                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1402                                 if (copy_to_user(&to->count,
1403                                                  &from->buf_count,
1404                                                  sizeof(from->buf_count)) ||
1405                                     copy_to_user(&to->size,
1406                                                  &from->buf_size,
1407                                                  sizeof(from->buf_size)) ||
1408                                     copy_to_user(&to->low_mark,
1409                                                  &list->low_mark,
1410                                                  sizeof(list->low_mark)) ||
1411                                     copy_to_user(&to->high_mark,
1412                                                  &list->high_mark,
1413                                                  sizeof(list->high_mark)))
1414                                         return -EFAULT;
1415
1416                                 DRM_DEBUG("%d %d %d %d %d\n",
1417                                           i,
1418                                           dma->bufs[i].buf_count,
1419                                           dma->bufs[i].buf_size,
1420                                           dma->bufs[i].freelist.low_mark,
1421                                           dma->bufs[i].freelist.high_mark);
1422                                 ++count;
1423                         }
1424                 }
1425         }
1426         request->count = count;
1427
1428         return 0;
1429 }
1430
1431 /**
1432  * Specifies a low and high water mark for buffer allocation
1433  *
1434  * \param inode device inode.
1435  * \param file_priv DRM file private.
1436  * \param cmd command.
1437  * \param arg a pointer to a drm_buf_desc structure.
1438  * \return zero on success or a negative number on failure.
1439  *
1440  * Verifies that the size order is bounded between the admissible orders and
1441  * updates the respective drm_device_dma::bufs entry low and high water mark.
1442  *
1443  * \note This ioctl is deprecated and mostly never used.
1444  */
1445 int drm_markbufs(struct drm_device *dev, void *data,
1446                  struct drm_file *file_priv)
1447 {
1448         struct drm_device_dma *dma = dev->dma;
1449         struct drm_buf_desc *request = data;
1450         int order;
1451         struct drm_buf_entry *entry;
1452
1453         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1454                 return -EINVAL;
1455
1456         if (!dma)
1457                 return -EINVAL;
1458
1459         DRM_DEBUG("%d, %d, %d\n",
1460                   request->size, request->low_mark, request->high_mark);
1461         order = drm_order(request->size);
1462         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1463                 return -EINVAL;
1464         entry = &dma->bufs[order];
1465
1466         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1467                 return -EINVAL;
1468         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1469                 return -EINVAL;
1470
1471         entry->freelist.low_mark = request->low_mark;
1472         entry->freelist.high_mark = request->high_mark;
1473
1474         return 0;
1475 }
1476
1477 /**
1478  * Unreserve the buffers in list, previously reserved using drmDMA.
1479  *
1480  * \param inode device inode.
1481  * \param file_priv DRM file private.
1482  * \param cmd command.
1483  * \param arg pointer to a drm_buf_free structure.
1484  * \return zero on success or a negative number on failure.
1485  *
1486  * Calls free_buffer() for each used buffer.
1487  * This function is primarily used for debugging.
1488  */
1489 int drm_freebufs(struct drm_device *dev, void *data,
1490                  struct drm_file *file_priv)
1491 {
1492         struct drm_device_dma *dma = dev->dma;
1493         struct drm_buf_free *request = data;
1494         int i;
1495         int idx;
1496         struct drm_buf *buf;
1497
1498         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1499                 return -EINVAL;
1500
1501         if (!dma)
1502                 return -EINVAL;
1503
1504         DRM_DEBUG("%d\n", request->count);
1505         for (i = 0; i < request->count; i++) {
1506                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1507                         return -EFAULT;
1508                 if (idx < 0 || idx >= dma->buf_count) {
1509                         DRM_ERROR("Index %d (of %d max)\n",
1510                                   idx, dma->buf_count - 1);
1511                         return -EINVAL;
1512                 }
1513                 buf = dma->buflist[idx];
1514                 if (buf->file_priv != file_priv) {
1515                         DRM_ERROR("Process %d freeing buffer not owned\n",
1516                                   task_pid_nr(current));
1517                         return -EINVAL;
1518                 }
1519                 drm_free_buffer(dev, buf);
1520         }
1521
1522         return 0;
1523 }
1524
1525 /**
1526  * Maps all of the DMA buffers into client-virtual space (ioctl).
1527  *
1528  * \param inode device inode.
1529  * \param file_priv DRM file private.
1530  * \param cmd command.
1531  * \param arg pointer to a drm_buf_map structure.
1532  * \return zero on success or a negative number on failure.
1533  *
1534  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1535  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1536  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1537  * drm_mmap_dma().
1538  */
1539 int drm_mapbufs(struct drm_device *dev, void *data,
1540                 struct drm_file *file_priv)
1541 {
1542         struct drm_device_dma *dma = dev->dma;
1543         int retcode = 0;
1544         const int zero = 0;
1545         unsigned long virtual;
1546         unsigned long address;
1547         struct drm_buf_map *request = data;
1548         int i;
1549
1550         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1551                 return -EINVAL;
1552
1553         if (!dma)
1554                 return -EINVAL;
1555
1556         spin_lock(&dev->count_lock);
1557         if (atomic_read(&dev->buf_alloc)) {
1558                 spin_unlock(&dev->count_lock);
1559                 return -EBUSY;
1560         }
1561         dev->buf_use++;         /* Can't allocate more after this call */
1562         spin_unlock(&dev->count_lock);
1563
1564         if (request->count >= dma->buf_count) {
1565                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1566                     || (drm_core_check_feature(dev, DRIVER_SG)
1567                         && (dma->flags & _DRM_DMA_USE_SG))
1568                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1569                         && (dma->flags & _DRM_DMA_USE_FB))) {
1570                         struct drm_local_map *map = dev->agp_buffer_map;
1571                         unsigned long token = dev->agp_buffer_token;
1572
1573                         if (!map) {
1574                                 retcode = -EINVAL;
1575                                 goto done;
1576                         }
1577                         down_write(&current->mm->mmap_sem);
1578                         virtual = do_mmap(file_priv->filp, 0, map->size,
1579                                           PROT_READ | PROT_WRITE,
1580                                           MAP_SHARED,
1581                                           token);
1582                         up_write(&current->mm->mmap_sem);
1583                 } else {
1584                         down_write(&current->mm->mmap_sem);
1585                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1586                                           PROT_READ | PROT_WRITE,
1587                                           MAP_SHARED, 0);
1588                         up_write(&current->mm->mmap_sem);
1589                 }
1590                 if (virtual > -1024UL) {
1591                         /* Real error */
1592                         retcode = (signed long)virtual;
1593                         goto done;
1594                 }
1595                 request->virtual = (void __user *)virtual;
1596
1597                 for (i = 0; i < dma->buf_count; i++) {
1598                         if (copy_to_user(&request->list[i].idx,
1599                                          &dma->buflist[i]->idx,
1600                                          sizeof(request->list[0].idx))) {
1601                                 retcode = -EFAULT;
1602                                 goto done;
1603                         }
1604                         if (copy_to_user(&request->list[i].total,
1605                                          &dma->buflist[i]->total,
1606                                          sizeof(request->list[0].total))) {
1607                                 retcode = -EFAULT;
1608                                 goto done;
1609                         }
1610                         if (copy_to_user(&request->list[i].used,
1611                                          &zero, sizeof(zero))) {
1612                                 retcode = -EFAULT;
1613                                 goto done;
1614                         }
1615                         address = virtual + dma->buflist[i]->offset;    /* *** */
1616                         if (copy_to_user(&request->list[i].address,
1617                                          &address, sizeof(address))) {
1618                                 retcode = -EFAULT;
1619                                 goto done;
1620                         }
1621                 }
1622         }
1623       done:
1624         request->count = dma->buf_count;
1625         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1626
1627         return retcode;
1628 }
1629
1630 /**
1631  * Compute size order.  Returns the exponent of the smaller power of two which
1632  * is greater or equal to given number.
1633  *
1634  * \param size size.
1635  * \return order.
1636  *
1637  * \todo Can be made faster.
1638  */
1639 int drm_order(unsigned long size)
1640 {
1641         int order;
1642         unsigned long tmp;
1643
1644         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1645
1646         if (size & (size - 1))
1647                 ++order;
1648
1649         return order;
1650 }
1651 EXPORT_SYMBOL(drm_order);