drivers/gpu/drm/drm_bufs.c

   1 /*
   2  * Legacy: Generic DRM Buffer Management
   3  *
   4  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
   5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   6  * All Rights Reserved.
   7  *
   8  * Author: Rickard E. (Rik) Faith <faith@valinux.com>
   9  * Author: Gareth Hughes <gareth@valinux.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice (including the next
  19  * paragraph) shall be included in all copies or substantial portions of the
  20  * Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  26  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  27  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  28  * OTHER DEALINGS IN THE SOFTWARE.
  29  */
  30
  31 #include <linux/vmalloc.h>
  32 #include <linux/slab.h>
  33 #include <linux/log2.h>
  34 #include <linux/export.h>
  35 #include <asm/shmparam.h>
  36 #include <drm/drmP.h>
  37 #include "drm_legacy.h"
  38
  39 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  40                                                   struct drm_local_map *map)
  41 {
  42         struct drm_map_list *entry;
  43         list_for_each_entry(entry, &dev->maplist, head) {
  44                 /*
  45                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  46                  * while PCI resources may live above that, we only compare the
  47                  * lower 32 bits of the map offset for maps of type
  48                  * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  49                  * It is assumed that if a driver have more than one resource
  50                  * of each type, the lower 32 bits are different.
  51                  */
  52                 if (!entry->map ||
  53                     map->type != entry->map->type ||
  54                     entry->master != dev->master)
  55                         continue;
  56                 switch (map->type) {
  57                 case _DRM_SHM:
  58                         if (map->flags != _DRM_CONTAINS_LOCK)
  59                                 break;
  60                         return entry;
  61                 case _DRM_REGISTERS:
  62                 case _DRM_FRAME_BUFFER:
  63                         if ((entry->map->offset & 0xffffffff) ==
  64                             (map->offset & 0xffffffff))
  65                                 return entry;
  66                 default: /* Make gcc happy */
  67                         ;
  68                 }
  69                 if (entry->map->offset == map->offset)
  70                         return entry;
  71         }
  72
  73         return NULL;
  74 }
  75
  76 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  77                           unsigned long user_token, int hashed_handle, int shm)
  78 {
  79         int use_hashed_handle, shift;
  80         unsigned long add;
  81
  82 #if (BITS_PER_LONG == 64)
  83         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  84 #elif (BITS_PER_LONG == 32)
  85         use_hashed_handle = hashed_handle;
  86 #else
  87 #error Unsupported long size. Neither 64 nor 32 bits.
  88 #endif
  89
  90         if (!use_hashed_handle) {
  91                 int ret;
  92                 hash->key = user_token >> PAGE_SHIFT;
  93                 ret = drm_ht_insert_item(&dev->map_hash, hash);
  94                 if (ret != -EINVAL)
  95                         return ret;
  96         }
  97
  98         shift = 0;
  99         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 100         if (shm && (SHMLBA > PAGE_SIZE)) {
 101                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 102
 103                 /* For shared memory, we have to preserve the SHMLBA
 104                  * bits of the eventual vma->vm_pgoff value during
 105                  * mmap().  Otherwise we run into cache aliasing problems
 106                  * on some platforms.  On these platforms, the pgoff of
 107                  * a mmap() request is used to pick a suitable virtual
 108                  * address for the mmap() region such that it will not
 109                  * cause cache aliasing problems.
 110                  *
 111                  * Therefore, make sure the SHMLBA relevant bits of the
 112                  * hash value we use are equal to those in the original
 113                  * kernel virtual address.
 114                  */
 115                 shift = bits;
 116                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 117         }
 118
 119         return drm_ht_just_insert_please(&dev->map_hash, hash,
 120                                          user_token, 32 - PAGE_SHIFT - 3,
 121                                          shift, add);
 122 }
 123
 124 /**
 125  * Core function to create a range of memory available for mapping by a
 126  * non-root process.
 127  *
 128  * Adjusts the memory offset to its absolute value according to the mapping
 129  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 130  * applicable and if supported by the kernel.
 131  */
 132 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 133                            unsigned int size, enum drm_map_type type,
 134                            enum drm_map_flags flags,
 135                            struct drm_map_list ** maplist)
 136 {
 137         struct drm_local_map *map;
 138         struct drm_map_list *list;
 139         drm_dma_handle_t *dmah;
 140         unsigned long user_token;
 141         int ret;
 142
 143         map = kmalloc(sizeof(*map), GFP_KERNEL);
 144         if (!map)
 145                 return -ENOMEM;
 146
 147         map->offset = offset;
 148         map->size = size;
 149         map->flags = flags;
 150         map->type = type;
 151
 152         /* Only allow shared memory to be removable since we only keep enough
 153          * book keeping information about shared memory to allow for removal
 154          * when processes fork.
 155          */
 156         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 157                 kfree(map);
 158                 return -EINVAL;
 159         }
 160         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 161                   (unsigned long long)map->offset, map->size, map->type);
 162
 163         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 164          * hole created by that and it works around various broken drivers that use
 165          * a non-aligned quantity to map the SAREA. --BenH
 166          */
 167         if (map->type == _DRM_SHM)
 168                 map->size = PAGE_ALIGN(map->size);
 169
 170         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 171                 kfree(map);
 172                 return -EINVAL;
 173         }
 174         map->mtrr = -1;
 175         map->handle = NULL;
 176
 177         switch (map->type) {
 178         case _DRM_REGISTERS:
 179         case _DRM_FRAME_BUFFER:
 180 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 181                 if (map->offset + (map->size-1) < map->offset ||
 182                     map->offset < virt_to_phys(high_memory)) {
 183                         kfree(map);
 184                         return -EINVAL;
 185                 }
 186 #endif
 187                 /* Some drivers preinitialize some maps, without the X Server
 188                  * needing to be aware of it.  Therefore, we just return success
 189                  * when the server tries to create a duplicate map.
 190                  */
 191                 list = drm_find_matching_map(dev, map);
 192                 if (list != NULL) {
 193                         if (list->map->size != map->size) {
 194                                 DRM_DEBUG("Matching maps of type %d with "
 195                                           "mismatched sizes, (%ld vs %ld)\n",
 196                                           map->type, map->size,
 197                                           list->map->size);
 198                                 list->map->size = map->size;
 199                         }
 200
 201                         kfree(map);
 202                         *maplist = list;
 203                         return 0;
 204                 }
 205
 206                 if (map->type == _DRM_FRAME_BUFFER ||
 207                     (map->flags & _DRM_WRITE_COMBINING)) {
 208                         map->mtrr =
 209                                 arch_phys_wc_add(map->offset, map->size);
 210                 }
 211                 if (map->type == _DRM_REGISTERS) {
 212                         if (map->flags & _DRM_WRITE_COMBINING)
 213                                 map->handle = ioremap_wc(map->offset,
 214                                                          map->size);
 215                         else
 216                                 map->handle = ioremap(map->offset, map->size);
 217                         if (!map->handle) {
 218                                 kfree(map);
 219                                 return -ENOMEM;
 220                         }
 221                 }
 222
 223                 break;
 224         case _DRM_SHM:
 225                 list = drm_find_matching_map(dev, map);
 226                 if (list != NULL) {
 227                         if(list->map->size != map->size) {
 228                                 DRM_DEBUG("Matching maps of type %d with "
 229                                           "mismatched sizes, (%ld vs %ld)\n",
 230                                           map->type, map->size, list->map->size);
 231                                 list->map->size = map->size;
 232                         }
 233
 234                         kfree(map);
 235                         *maplist = list;
 236                         return 0;
 237                 }
 238                 map->handle = vmalloc_user(map->size);
 239                 DRM_DEBUG("%lu %d %p\n",
 240                           map->size, order_base_2(map->size), map->handle);
 241                 if (!map->handle) {
 242                         kfree(map);
 243                         return -ENOMEM;
 244                 }
 245                 map->offset = (unsigned long)map->handle;
 246                 if (map->flags & _DRM_CONTAINS_LOCK) {
 247                         /* Prevent a 2nd X Server from creating a 2nd lock */
 248                         if (dev->master->lock.hw_lock != NULL) {
 249                                 vfree(map->handle);
 250                                 kfree(map);
 251                                 return -EBUSY;
 252                         }
 253                         dev->sigdata.lock = dev->master->lock.hw_lock = map->handle;    /* Pointer to lock */
 254                 }
 255                 break;
 256         case _DRM_AGP: {
 257                 struct drm_agp_mem *entry;
 258                 int valid = 0;
 259
 260                 if (!dev->agp) {
 261                         kfree(map);
 262                         return -EINVAL;
 263                 }
 264 #ifdef __alpha__
 265                 map->offset += dev->hose->mem_space->start;
 266 #endif
 267                 /* In some cases (i810 driver), user space may have already
 268                  * added the AGP base itself, because dev->agp->base previously
 269                  * only got set during AGP enable.  So, only add the base
 270                  * address if the map's offset isn't already within the
 271                  * aperture.
 272                  */
 273                 if (map->offset < dev->agp->base ||
 274                     map->offset > dev->agp->base +
 275                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 276                         map->offset += dev->agp->base;
 277                 }
 278                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 279
 280                 /* This assumes the DRM is in total control of AGP space.
 281                  * It's not always the case as AGP can be in the control
 282                  * of user space (i.e. i810 driver). So this loop will get
 283                  * skipped and we double check that dev->agp->memory is
 284                  * actually set as well as being invalid before EPERM'ing
 285                  */
 286                 list_for_each_entry(entry, &dev->agp->memory, head) {
 287                         if ((map->offset >= entry->bound) &&
 288                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 289                                 valid = 1;
 290                                 break;
 291                         }
 292                 }
 293                 if (!list_empty(&dev->agp->memory) && !valid) {
 294                         kfree(map);
 295                         return -EPERM;
 296                 }
 297                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 298                           (unsigned long long)map->offset, map->size);
 299
 300                 break;
 301         }
 302         case _DRM_SCATTER_GATHER:
 303                 if (!dev->sg) {
 304                         kfree(map);
 305                         return -EINVAL;
 306                 }
 307                 map->offset += (unsigned long)dev->sg->virtual;
 308                 break;
 309         case _DRM_CONSISTENT:
 310                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 311                  * As we're limiting the address to 2^32-1 (or less),
 312                  * casting it down to 32 bits is no problem, but we
 313                  * need to point to a 64bit variable first. */
 314                 dmah = drm_pci_alloc(dev, map->size, map->size);
 315                 if (!dmah) {
 316                         kfree(map);
 317                         return -ENOMEM;
 318                 }
 319                 map->handle = dmah->vaddr;
 320                 map->offset = (unsigned long)dmah->busaddr;
 321                 kfree(dmah);
 322                 break;
 323         default:
 324                 kfree(map);
 325                 return -EINVAL;
 326         }
 327
 328         list = kzalloc(sizeof(*list), GFP_KERNEL);
 329         if (!list) {
 330                 if (map->type == _DRM_REGISTERS)
 331                         iounmap(map->handle);
 332                 kfree(map);
 333                 return -EINVAL;
 334         }
 335         list->map = map;
 336
 337         mutex_lock(&dev->struct_mutex);
 338         list_add(&list->head, &dev->maplist);
 339
 340         /* Assign a 32-bit handle */
 341         /* We do it here so that dev->struct_mutex protects the increment */
 342         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 343                 map->offset;
 344         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 345                              (map->type == _DRM_SHM));
 346         if (ret) {
 347                 if (map->type == _DRM_REGISTERS)
 348                         iounmap(map->handle);
 349                 kfree(map);
 350                 kfree(list);
 351                 mutex_unlock(&dev->struct_mutex);
 352                 return ret;
 353         }
 354
 355         list->user_token = list->hash.key << PAGE_SHIFT;
 356         mutex_unlock(&dev->struct_mutex);
 357
 358         if (!(map->flags & _DRM_DRIVER))
 359                 list->master = dev->master;
 360         *maplist = list;
 361         return 0;
 362 }
 363
 364 int drm_legacy_addmap(struct drm_device * dev, resource_size_t offset,
 365                       unsigned int size, enum drm_map_type type,
 366                       enum drm_map_flags flags, struct drm_local_map **map_ptr)
 367 {
 368         struct drm_map_list *list;
 369         int rc;
 370
 371         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 372         if (!rc)
 373                 *map_ptr = list->map;
 374         return rc;
 375 }
 376 EXPORT_SYMBOL(drm_legacy_addmap);
 377
 378 /**
 379  * Ioctl to specify a range of memory that is available for mapping by a
 380  * non-root process.
 381  *
 382  * \param inode device inode.
 383  * \param file_priv DRM file private.
 384  * \param cmd command.
 385  * \param arg pointer to a drm_map structure.
 386  * \return zero on success or a negative value on error.
 387  *
 388  */
 389 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
 390                             struct drm_file *file_priv)
 391 {
 392         struct drm_map *map = data;
 393         struct drm_map_list *maplist;
 394         int err;
 395
 396         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 397                 return -EPERM;
 398
 399         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 400             !drm_core_check_feature(dev, DRIVER_LEGACY))
 401                 return -EINVAL;
 402
 403         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 404                               map->flags, &maplist);
 405
 406         if (err)
 407                 return err;
 408
 409         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 410         map->handle = (void *)(unsigned long)maplist->user_token;
 411
 412         /*
 413          * It appears that there are no users of this value whatsoever --
 414          * drmAddMap just discards it.  Let's not encourage its use.
 415          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 416          *  it's not a real mtrr index anymore.)
 417          */
 418         map->mtrr = -1;
 419
 420         return 0;
 421 }
 422
 423 /*
 424  * Get a mapping information.
 425  *
 426  * \param inode device inode.
 427  * \param file_priv DRM file private.
 428  * \param cmd command.
 429  * \param arg user argument, pointing to a drm_map structure.
 430  *
 431  * \return zero on success or a negative number on failure.
 432  *
 433  * Searches for the mapping with the specified offset and copies its information
 434  * into userspace
 435  */
 436 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
 437                             struct drm_file *file_priv)
 438 {
 439         struct drm_map *map = data;
 440         struct drm_map_list *r_list = NULL;
 441         struct list_head *list;
 442         int idx;
 443         int i;
 444
 445         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 446             !drm_core_check_feature(dev, DRIVER_LEGACY))
 447                 return -EINVAL;
 448
 449         idx = map->offset;
 450         if (idx < 0)
 451                 return -EINVAL;
 452
 453         i = 0;
 454         mutex_lock(&dev->struct_mutex);
 455         list_for_each(list, &dev->maplist) {
 456                 if (i == idx) {
 457                         r_list = list_entry(list, struct drm_map_list, head);
 458                         break;
 459                 }
 460                 i++;
 461         }
 462         if (!r_list || !r_list->map) {
 463                 mutex_unlock(&dev->struct_mutex);
 464                 return -EINVAL;
 465         }
 466
 467         map->offset = r_list->map->offset;
 468         map->size = r_list->map->size;
 469         map->type = r_list->map->type;
 470         map->flags = r_list->map->flags;
 471         map->handle = (void *)(unsigned long) r_list->user_token;
 472         map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
 473
 474         mutex_unlock(&dev->struct_mutex);
 475
 476         return 0;
 477 }
 478
 479 /**
 480  * Remove a map private from list and deallocate resources if the mapping
 481  * isn't in use.
 482  *
 483  * Searches the map on drm_device::maplist, removes it from the list, see if
 484  * its being used, and free any associate resource (such as MTRR's) if it's not
 485  * being on use.
 486  *
 487  * \sa drm_legacy_addmap
 488  */
 489 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 490 {
 491         struct drm_map_list *r_list = NULL, *list_t;
 492         drm_dma_handle_t dmah;
 493         int found = 0;
 494         struct drm_master *master;
 495
 496         /* Find the list entry for the map and remove it */
 497         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 498                 if (r_list->map == map) {
 499                         master = r_list->master;
 500                         list_del(&r_list->head);
 501                         drm_ht_remove_key(&dev->map_hash,
 502                                           r_list->user_token >> PAGE_SHIFT);
 503                         kfree(r_list);
 504                         found = 1;
 505                         break;
 506                 }
 507         }
 508
 509         if (!found)
 510                 return -EINVAL;
 511
 512         switch (map->type) {
 513         case _DRM_REGISTERS:
 514                 iounmap(map->handle);
 515                 /* FALLTHROUGH */
 516         case _DRM_FRAME_BUFFER:
 517                 arch_phys_wc_del(map->mtrr);
 518                 break;
 519         case _DRM_SHM:
 520                 vfree(map->handle);
 521                 if (master) {
 522                         if (dev->sigdata.lock == master->lock.hw_lock)
 523                                 dev->sigdata.lock = NULL;
 524                         master->lock.hw_lock = NULL;   /* SHM removed */
 525                         master->lock.file_priv = NULL;
 526                         wake_up_interruptible_all(&master->lock.lock_queue);
 527                 }
 528                 break;
 529         case _DRM_AGP:
 530         case _DRM_SCATTER_GATHER:
 531                 break;
 532         case _DRM_CONSISTENT:
 533                 dmah.vaddr = map->handle;
 534                 dmah.busaddr = map->offset;
 535                 dmah.size = map->size;
 536                 __drm_legacy_pci_free(dev, &dmah);
 537                 break;
 538         }
 539         kfree(map);
 540
 541         return 0;
 542 }
 543 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
 544
 545 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
 546 {
 547         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 548             !drm_core_check_feature(dev, DRIVER_LEGACY))
 549                 return;
 550
 551         mutex_lock(&dev->struct_mutex);
 552         drm_legacy_rmmap_locked(dev, map);
 553         mutex_unlock(&dev->struct_mutex);
 554 }
 555 EXPORT_SYMBOL(drm_legacy_rmmap);
 556
 557 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
 558 {
 559         struct drm_map_list *r_list, *list_temp;
 560
 561         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 562                 return;
 563
 564         mutex_lock(&dev->struct_mutex);
 565         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 566                 if (r_list->master == master) {
 567                         drm_legacy_rmmap_locked(dev, r_list->map);
 568                         r_list = NULL;
 569                 }
 570         }
 571         mutex_unlock(&dev->struct_mutex);
 572 }
 573
 574 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 575  * the last close of the device, and this is necessary for cleanup when things
 576  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 577  * like a pointless exercise since they're going away anyway.
 578  *
 579  * One use case might be after addmap is allowed for normal users for SHM and
 580  * gets used by drivers that the server doesn't need to care about.  This seems
 581  * unlikely.
 582  *
 583  * \param inode device inode.
 584  * \param file_priv DRM file private.
 585  * \param cmd command.
 586  * \param arg pointer to a struct drm_map structure.
 587  * \return zero on success or a negative value on error.
 588  */
 589 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
 590                            struct drm_file *file_priv)
 591 {
 592         struct drm_map *request = data;
 593         struct drm_local_map *map = NULL;
 594         struct drm_map_list *r_list;
 595         int ret;
 596
 597         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 598             !drm_core_check_feature(dev, DRIVER_LEGACY))
 599                 return -EINVAL;
 600
 601         mutex_lock(&dev->struct_mutex);
 602         list_for_each_entry(r_list, &dev->maplist, head) {
 603                 if (r_list->map &&
 604                     r_list->user_token == (unsigned long)request->handle &&
 605                     r_list->map->flags & _DRM_REMOVABLE) {
 606                         map = r_list->map;
 607                         break;
 608                 }
 609         }
 610
 611         /* List has wrapped around to the head pointer, or its empty we didn't
 612          * find anything.
 613          */
 614         if (list_empty(&dev->maplist) || !map) {
 615                 mutex_unlock(&dev->struct_mutex);
 616                 return -EINVAL;
 617         }
 618
 619         /* Register and framebuffer maps are permanent */
 620         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 621                 mutex_unlock(&dev->struct_mutex);
 622                 return 0;
 623         }
 624
 625         ret = drm_legacy_rmmap_locked(dev, map);
 626
 627         mutex_unlock(&dev->struct_mutex);
 628
 629         return ret;
 630 }
 631
 632 /**
 633  * Cleanup after an error on one of the addbufs() functions.
 634  *
 635  * \param dev DRM device.
 636  * \param entry buffer entry where the error occurred.
 637  *
 638  * Frees any pages and buffers associated with the given entry.
 639  */
 640 static void drm_cleanup_buf_error(struct drm_device * dev,
 641                                   struct drm_buf_entry * entry)
 642 {
 643         int i;
 644
 645         if (entry->seg_count) {
 646                 for (i = 0; i < entry->seg_count; i++) {
 647                         if (entry->seglist[i]) {
 648                                 drm_pci_free(dev, entry->seglist[i]);
 649                         }
 650                 }
 651                 kfree(entry->seglist);
 652
 653                 entry->seg_count = 0;
 654         }
 655
 656         if (entry->buf_count) {
 657                 for (i = 0; i < entry->buf_count; i++) {
 658                         kfree(entry->buflist[i].dev_private);
 659                 }
 660                 kfree(entry->buflist);
 661
 662                 entry->buf_count = 0;
 663         }
 664 }
 665
 666 #if IS_ENABLED(CONFIG_AGP)
 667 /**
 668  * Add AGP buffers for DMA transfers.
 669  *
 670  * \param dev struct drm_device to which the buffers are to be added.
 671  * \param request pointer to a struct drm_buf_desc describing the request.
 672  * \return zero on success or a negative number on failure.
 673  *
 674  * After some sanity checks creates a drm_buf structure for each buffer and
 675  * reallocates the buffer list of the same size order to accommodate the new
 676  * buffers.
 677  */
 678 int drm_legacy_addbufs_agp(struct drm_device *dev,
 679                            struct drm_buf_desc *request)
 680 {
 681         struct drm_device_dma *dma = dev->dma;
 682         struct drm_buf_entry *entry;
 683         struct drm_agp_mem *agp_entry;
 684         struct drm_buf *buf;
 685         unsigned long offset;
 686         unsigned long agp_offset;
 687         int count;
 688         int order;
 689         int size;
 690         int alignment;
 691         int page_order;
 692         int total;
 693         int byte_count;
 694         int i, valid;
 695         struct drm_buf **temp_buflist;
 696
 697         if (!dma)
 698                 return -EINVAL;
 699
 700         count = request->count;
 701         order = order_base_2(request->size);
 702         size = 1 << order;
 703
 704         alignment = (request->flags & _DRM_PAGE_ALIGN)
 705             ? PAGE_ALIGN(size) : size;
 706         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 707         total = PAGE_SIZE << page_order;
 708
 709         byte_count = 0;
 710         agp_offset = dev->agp->base + request->agp_start;
 711
 712         DRM_DEBUG("count:      %d\n", count);
 713         DRM_DEBUG("order:      %d\n", order);
 714         DRM_DEBUG("size:       %d\n", size);
 715         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 716         DRM_DEBUG("alignment:  %d\n", alignment);
 717         DRM_DEBUG("page_order: %d\n", page_order);
 718         DRM_DEBUG("total:      %d\n", total);
 719
 720         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 721                 return -EINVAL;
 722
 723         /* Make sure buffers are located in AGP memory that we own */
 724         valid = 0;
 725         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 726                 if ((agp_offset >= agp_entry->bound) &&
 727                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 728                         valid = 1;
 729                         break;
 730                 }
 731         }
 732         if (!list_empty(&dev->agp->memory) && !valid) {
 733                 DRM_DEBUG("zone invalid\n");
 734                 return -EINVAL;
 735         }
 736         spin_lock(&dev->buf_lock);
 737         if (dev->buf_use) {
 738                 spin_unlock(&dev->buf_lock);
 739                 return -EBUSY;
 740         }
 741         atomic_inc(&dev->buf_alloc);
 742         spin_unlock(&dev->buf_lock);
 743
 744         mutex_lock(&dev->struct_mutex);
 745         entry = &dma->bufs[order];
 746         if (entry->buf_count) {
 747                 mutex_unlock(&dev->struct_mutex);
 748                 atomic_dec(&dev->buf_alloc);
 749                 return -ENOMEM; /* May only call once for each order */
 750         }
 751
 752         if (count < 0 || count > 4096) {
 753                 mutex_unlock(&dev->struct_mutex);
 754                 atomic_dec(&dev->buf_alloc);
 755                 return -EINVAL;
 756         }
 757
 758         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 759         if (!entry->buflist) {
 760                 mutex_unlock(&dev->struct_mutex);
 761                 atomic_dec(&dev->buf_alloc);
 762                 return -ENOMEM;
 763         }
 764
 765         entry->buf_size = size;
 766         entry->page_order = page_order;
 767
 768         offset = 0;
 769
 770         while (entry->buf_count < count) {
 771                 buf = &entry->buflist[entry->buf_count];
 772                 buf->idx = dma->buf_count + entry->buf_count;
 773                 buf->total = alignment;
 774                 buf->order = order;
 775                 buf->used = 0;
 776
 777                 buf->offset = (dma->byte_count + offset);
 778                 buf->bus_address = agp_offset + offset;
 779                 buf->address = (void *)(agp_offset + offset);
 780                 buf->next = NULL;
 781                 buf->waiting = 0;
 782                 buf->pending = 0;
 783                 buf->file_priv = NULL;
 784
 785                 buf->dev_priv_size = dev->driver->dev_priv_size;
 786                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 787                 if (!buf->dev_private) {
 788                         /* Set count correctly so we free the proper amount. */
 789                         entry->buf_count = count;
 790                         drm_cleanup_buf_error(dev, entry);
 791                         mutex_unlock(&dev->struct_mutex);
 792                         atomic_dec(&dev->buf_alloc);
 793                         return -ENOMEM;
 794                 }
 795
 796                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 797
 798                 offset += alignment;
 799                 entry->buf_count++;
 800                 byte_count += PAGE_SIZE << page_order;
 801         }
 802
 803         DRM_DEBUG("byte_count: %d\n", byte_count);
 804
 805         temp_buflist = krealloc(dma->buflist,
 806                                 (dma->buf_count + entry->buf_count) *
 807                                 sizeof(*dma->buflist), GFP_KERNEL);
 808         if (!temp_buflist) {
 809                 /* Free the entry because it isn't valid */
 810                 drm_cleanup_buf_error(dev, entry);
 811                 mutex_unlock(&dev->struct_mutex);
 812                 atomic_dec(&dev->buf_alloc);
 813                 return -ENOMEM;
 814         }
 815         dma->buflist = temp_buflist;
 816
 817         for (i = 0; i < entry->buf_count; i++) {
 818                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 819         }
 820
 821         dma->buf_count += entry->buf_count;
 822         dma->seg_count += entry->seg_count;
 823         dma->page_count += byte_count >> PAGE_SHIFT;
 824         dma->byte_count += byte_count;
 825
 826         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 827         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 828
 829         mutex_unlock(&dev->struct_mutex);
 830
 831         request->count = entry->buf_count;
 832         request->size = size;
 833
 834         dma->flags = _DRM_DMA_USE_AGP;
 835
 836         atomic_dec(&dev->buf_alloc);
 837         return 0;
 838 }
 839 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
 840 #endif /* CONFIG_AGP */
 841
 842 int drm_legacy_addbufs_pci(struct drm_device *dev,
 843                            struct drm_buf_desc *request)
 844 {
 845         struct drm_device_dma *dma = dev->dma;
 846         int count;
 847         int order;
 848         int size;
 849         int total;
 850         int page_order;
 851         struct drm_buf_entry *entry;
 852         drm_dma_handle_t *dmah;
 853         struct drm_buf *buf;
 854         int alignment;
 855         unsigned long offset;
 856         int i;
 857         int byte_count;
 858         int page_count;
 859         unsigned long *temp_pagelist;
 860         struct drm_buf **temp_buflist;
 861
 862         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 863                 return -EINVAL;
 864
 865         if (!dma)
 866                 return -EINVAL;
 867
 868         if (!capable(CAP_SYS_ADMIN))
 869                 return -EPERM;
 870
 871         count = request->count;
 872         order = order_base_2(request->size);
 873         size = 1 << order;
 874
 875         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 876                   request->count, request->size, size, order);
 877
 878         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 879                 return -EINVAL;
 880
 881         alignment = (request->flags & _DRM_PAGE_ALIGN)
 882             ? PAGE_ALIGN(size) : size;
 883         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 884         total = PAGE_SIZE << page_order;
 885
 886         spin_lock(&dev->buf_lock);
 887         if (dev->buf_use) {
 888                 spin_unlock(&dev->buf_lock);
 889                 return -EBUSY;
 890         }
 891         atomic_inc(&dev->buf_alloc);
 892         spin_unlock(&dev->buf_lock);
 893
 894         mutex_lock(&dev->struct_mutex);
 895         entry = &dma->bufs[order];
 896         if (entry->buf_count) {
 897                 mutex_unlock(&dev->struct_mutex);
 898                 atomic_dec(&dev->buf_alloc);
 899                 return -ENOMEM; /* May only call once for each order */
 900         }
 901
 902         if (count < 0 || count > 4096) {
 903                 mutex_unlock(&dev->struct_mutex);
 904                 atomic_dec(&dev->buf_alloc);
 905                 return -EINVAL;
 906         }
 907
 908         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 909         if (!entry->buflist) {
 910                 mutex_unlock(&dev->struct_mutex);
 911                 atomic_dec(&dev->buf_alloc);
 912                 return -ENOMEM;
 913         }
 914
 915         entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
 916         if (!entry->seglist) {
 917                 kfree(entry->buflist);
 918                 mutex_unlock(&dev->struct_mutex);
 919                 atomic_dec(&dev->buf_alloc);
 920                 return -ENOMEM;
 921         }
 922
 923         /* Keep the original pagelist until we know all the allocations
 924          * have succeeded
 925          */
 926         temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
 927                                       sizeof(*dma->pagelist),
 928                                       GFP_KERNEL);
 929         if (!temp_pagelist) {
 930                 kfree(entry->buflist);
 931                 kfree(entry->seglist);
 932                 mutex_unlock(&dev->struct_mutex);
 933                 atomic_dec(&dev->buf_alloc);
 934                 return -ENOMEM;
 935         }
 936         memcpy(temp_pagelist,
 937                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 938         DRM_DEBUG("pagelist: %d entries\n",
 939                   dma->page_count + (count << page_order));
 940
 941         entry->buf_size = size;
 942         entry->page_order = page_order;
 943         byte_count = 0;
 944         page_count = 0;
 945
 946         while (entry->buf_count < count) {
 947
 948                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 949
 950                 if (!dmah) {
 951                         /* Set count correctly so we free the proper amount. */
 952                         entry->buf_count = count;
 953                         entry->seg_count = count;
 954                         drm_cleanup_buf_error(dev, entry);
 955                         kfree(temp_pagelist);
 956                         mutex_unlock(&dev->struct_mutex);
 957                         atomic_dec(&dev->buf_alloc);
 958                         return -ENOMEM;
 959                 }
 960                 entry->seglist[entry->seg_count++] = dmah;
 961                 for (i = 0; i < (1 << page_order); i++) {
 962                         DRM_DEBUG("page %d @ 0x%08lx\n",
 963                                   dma->page_count + page_count,
 964                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 965                         temp_pagelist[dma->page_count + page_count++]
 966                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 967                 }
 968                 for (offset = 0;
 969                      offset + size <= total && entry->buf_count < count;
 970                      offset += alignment, ++entry->buf_count) {
 971                         buf = &entry->buflist[entry->buf_count];
 972                         buf->idx = dma->buf_count + entry->buf_count;
 973                         buf->total = alignment;
 974                         buf->order = order;
 975                         buf->used = 0;
 976                         buf->offset = (dma->byte_count + byte_count + offset);
 977                         buf->address = (void *)(dmah->vaddr + offset);
 978                         buf->bus_address = dmah->busaddr + offset;
 979                         buf->next = NULL;
 980                         buf->waiting = 0;
 981                         buf->pending = 0;
 982                         buf->file_priv = NULL;
 983
 984                         buf->dev_priv_size = dev->driver->dev_priv_size;
 985                         buf->dev_private = kzalloc(buf->dev_priv_size,
 986                                                 GFP_KERNEL);
 987                         if (!buf->dev_private) {
 988                                 /* Set count correctly so we free the proper amount. */
 989                                 entry->buf_count = count;
 990                                 entry->seg_count = count;
 991                                 drm_cleanup_buf_error(dev, entry);
 992                                 kfree(temp_pagelist);
 993                                 mutex_unlock(&dev->struct_mutex);
 994                                 atomic_dec(&dev->buf_alloc);
 995                                 return -ENOMEM;
 996                         }
 997
 998                         DRM_DEBUG("buffer %d @ %p\n",
 999                                   entry->buf_count, buf->address);
1000                 }
1001                 byte_count += PAGE_SIZE << page_order;
1002         }
1003
1004         temp_buflist = krealloc(dma->buflist,
1005                                 (dma->buf_count + entry->buf_count) *
1006                                 sizeof(*dma->buflist), GFP_KERNEL);
1007         if (!temp_buflist) {
1008                 /* Free the entry because it isn't valid */
1009                 drm_cleanup_buf_error(dev, entry);
1010                 kfree(temp_pagelist);
1011                 mutex_unlock(&dev->struct_mutex);
1012                 atomic_dec(&dev->buf_alloc);
1013                 return -ENOMEM;
1014         }
1015         dma->buflist = temp_buflist;
1016
1017         for (i = 0; i < entry->buf_count; i++) {
1018                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1019         }
1020
1021         /* No allocations failed, so now we can replace the original pagelist
1022          * with the new one.
1023          */
1024         if (dma->page_count) {
1025                 kfree(dma->pagelist);
1026         }
1027         dma->pagelist = temp_pagelist;
1028
1029         dma->buf_count += entry->buf_count;
1030         dma->seg_count += entry->seg_count;
1031         dma->page_count += entry->seg_count << page_order;
1032         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1033
1034         mutex_unlock(&dev->struct_mutex);
1035
1036         request->count = entry->buf_count;
1037         request->size = size;
1038
1039         if (request->flags & _DRM_PCI_BUFFER_RO)
1040                 dma->flags = _DRM_DMA_USE_PCI_RO;
1041
1042         atomic_dec(&dev->buf_alloc);
1043         return 0;
1044
1045 }
1046 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1047
1048 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1049                                  struct drm_buf_desc *request)
1050 {
1051         struct drm_device_dma *dma = dev->dma;
1052         struct drm_buf_entry *entry;
1053         struct drm_buf *buf;
1054         unsigned long offset;
1055         unsigned long agp_offset;
1056         int count;
1057         int order;
1058         int size;
1059         int alignment;
1060         int page_order;
1061         int total;
1062         int byte_count;
1063         int i;
1064         struct drm_buf **temp_buflist;
1065
1066         if (!drm_core_check_feature(dev, DRIVER_SG))
1067                 return -EINVAL;
1068
1069         if (!dma)
1070                 return -EINVAL;
1071
1072         if (!capable(CAP_SYS_ADMIN))
1073                 return -EPERM;
1074
1075         count = request->count;
1076         order = order_base_2(request->size);
1077         size = 1 << order;
1078
1079         alignment = (request->flags & _DRM_PAGE_ALIGN)
1080             ? PAGE_ALIGN(size) : size;
1081         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1082         total = PAGE_SIZE << page_order;
1083
1084         byte_count = 0;
1085         agp_offset = request->agp_start;
1086
1087         DRM_DEBUG("count:      %d\n", count);
1088         DRM_DEBUG("order:      %d\n", order);
1089         DRM_DEBUG("size:       %d\n", size);
1090         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1091         DRM_DEBUG("alignment:  %d\n", alignment);
1092         DRM_DEBUG("page_order: %d\n", page_order);
1093         DRM_DEBUG("total:      %d\n", total);
1094
1095         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1096                 return -EINVAL;
1097
1098         spin_lock(&dev->buf_lock);
1099         if (dev->buf_use) {
1100                 spin_unlock(&dev->buf_lock);
1101                 return -EBUSY;
1102         }
1103         atomic_inc(&dev->buf_alloc);
1104         spin_unlock(&dev->buf_lock);
1105
1106         mutex_lock(&dev->struct_mutex);
1107         entry = &dma->bufs[order];
1108         if (entry->buf_count) {
1109                 mutex_unlock(&dev->struct_mutex);
1110                 atomic_dec(&dev->buf_alloc);
1111                 return -ENOMEM; /* May only call once for each order */
1112         }
1113
1114         if (count < 0 || count > 4096) {
1115                 mutex_unlock(&dev->struct_mutex);
1116                 atomic_dec(&dev->buf_alloc);
1117                 return -EINVAL;
1118         }
1119
1120         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1121         if (!entry->buflist) {
1122                 mutex_unlock(&dev->struct_mutex);
1123                 atomic_dec(&dev->buf_alloc);
1124                 return -ENOMEM;
1125         }
1126
1127         entry->buf_size = size;
1128         entry->page_order = page_order;
1129
1130         offset = 0;
1131
1132         while (entry->buf_count < count) {
1133                 buf = &entry->buflist[entry->buf_count];
1134                 buf->idx = dma->buf_count + entry->buf_count;
1135                 buf->total = alignment;
1136                 buf->order = order;
1137                 buf->used = 0;
1138
1139                 buf->offset = (dma->byte_count + offset);
1140                 buf->bus_address = agp_offset + offset;
1141                 buf->address = (void *)(agp_offset + offset
1142                                         + (unsigned long)dev->sg->virtual);
1143                 buf->next = NULL;
1144                 buf->waiting = 0;
1145                 buf->pending = 0;
1146                 buf->file_priv = NULL;
1147
1148                 buf->dev_priv_size = dev->driver->dev_priv_size;
1149                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1150                 if (!buf->dev_private) {
1151                         /* Set count correctly so we free the proper amount. */
1152                         entry->buf_count = count;
1153                         drm_cleanup_buf_error(dev, entry);
1154                         mutex_unlock(&dev->struct_mutex);
1155                         atomic_dec(&dev->buf_alloc);
1156                         return -ENOMEM;
1157                 }
1158
1159                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1160
1161                 offset += alignment;
1162                 entry->buf_count++;
1163                 byte_count += PAGE_SIZE << page_order;
1164         }
1165
1166         DRM_DEBUG("byte_count: %d\n", byte_count);
1167
1168         temp_buflist = krealloc(dma->buflist,
1169                                 (dma->buf_count + entry->buf_count) *
1170                                 sizeof(*dma->buflist), GFP_KERNEL);
1171         if (!temp_buflist) {
1172                 /* Free the entry because it isn't valid */
1173                 drm_cleanup_buf_error(dev, entry);
1174                 mutex_unlock(&dev->struct_mutex);
1175                 atomic_dec(&dev->buf_alloc);
1176                 return -ENOMEM;
1177         }
1178         dma->buflist = temp_buflist;
1179
1180         for (i = 0; i < entry->buf_count; i++) {
1181                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1182         }
1183
1184         dma->buf_count += entry->buf_count;
1185         dma->seg_count += entry->seg_count;
1186         dma->page_count += byte_count >> PAGE_SHIFT;
1187         dma->byte_count += byte_count;
1188
1189         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1190         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1191
1192         mutex_unlock(&dev->struct_mutex);
1193
1194         request->count = entry->buf_count;
1195         request->size = size;
1196
1197         dma->flags = _DRM_DMA_USE_SG;
1198
1199         atomic_dec(&dev->buf_alloc);
1200         return 0;
1201 }
1202
1203 /**
1204  * Add buffers for DMA transfers (ioctl).
1205  *
1206  * \param inode device inode.
1207  * \param file_priv DRM file private.
1208  * \param cmd command.
1209  * \param arg pointer to a struct drm_buf_desc request.
1210  * \return zero on success or a negative number on failure.
1211  *
1212  * According with the memory type specified in drm_buf_desc::flags and the
1213  * build options, it dispatches the call either to addbufs_agp(),
1214  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1215  * PCI memory respectively.
1216  */
1217 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1218                        struct drm_file *file_priv)
1219 {
1220         struct drm_buf_desc *request = data;
1221         int ret;
1222
1223         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1224                 return -EINVAL;
1225
1226         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1227                 return -EINVAL;
1228
1229 #if IS_ENABLED(CONFIG_AGP)
1230         if (request->flags & _DRM_AGP_BUFFER)
1231                 ret = drm_legacy_addbufs_agp(dev, request);
1232         else
1233 #endif
1234         if (request->flags & _DRM_SG_BUFFER)
1235                 ret = drm_legacy_addbufs_sg(dev, request);
1236         else if (request->flags & _DRM_FB_BUFFER)
1237                 ret = -EINVAL;
1238         else
1239                 ret = drm_legacy_addbufs_pci(dev, request);
1240
1241         return ret;
1242 }
1243
1244 /**
1245  * Get information about the buffer mappings.
1246  *
1247  * This was originally mean for debugging purposes, or by a sophisticated
1248  * client library to determine how best to use the available buffers (e.g.,
1249  * large buffers can be used for image transfer).
1250  *
1251  * \param inode device inode.
1252  * \param file_priv DRM file private.
1253  * \param cmd command.
1254  * \param arg pointer to a drm_buf_info structure.
1255  * \return zero on success or a negative number on failure.
1256  *
1257  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1258  * lock, preventing of allocating more buffers after this call. Information
1259  * about each requested buffer is then copied into user space.
1260  */
1261 int __drm_legacy_infobufs(struct drm_device *dev,
1262                         void *data, int *p,
1263                         int (*f)(void *, int, struct drm_buf_entry *))
1264 {
1265         struct drm_device_dma *dma = dev->dma;
1266         int i;
1267         int count;
1268
1269         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1270                 return -EINVAL;
1271
1272         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1273                 return -EINVAL;
1274
1275         if (!dma)
1276                 return -EINVAL;
1277
1278         spin_lock(&dev->buf_lock);
1279         if (atomic_read(&dev->buf_alloc)) {
1280                 spin_unlock(&dev->buf_lock);
1281                 return -EBUSY;
1282         }
1283         ++dev->buf_use;         /* Can't allocate more after this call */
1284         spin_unlock(&dev->buf_lock);
1285
1286         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1287                 if (dma->bufs[i].buf_count)
1288                         ++count;
1289         }
1290
1291         DRM_DEBUG("count = %d\n", count);
1292
1293         if (*p >= count) {
1294                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1295                         struct drm_buf_entry *from = &dma->bufs[i];
1296                         if (from->buf_count) {
1297                                 if (f(data, count, from) < 0)
1298                                         return -EFAULT;
1299                                 DRM_DEBUG("%d %d %d %d %d\n",
1300                                           i,
1301                                           dma->bufs[i].buf_count,
1302                                           dma->bufs[i].buf_size,
1303                                           dma->bufs[i].low_mark,
1304                                           dma->bufs[i].high_mark);
1305                                 ++count;
1306                         }
1307                 }
1308         }
1309         *p = count;
1310
1311         return 0;
1312 }
1313
1314 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1315 {
1316         struct drm_buf_info *request = data;
1317         struct drm_buf_desc __user *to = &request->list[count];
1318         struct drm_buf_desc v = {.count = from->buf_count,
1319                                  .size = from->buf_size,
1320                                  .low_mark = from->low_mark,
1321                                  .high_mark = from->high_mark};
1322         return copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags));
1323 }
1324
1325 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1326                         struct drm_file *file_priv)
1327 {
1328         struct drm_buf_info *request = data;
1329         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1330 }
1331
1332 /**
1333  * Specifies a low and high water mark for buffer allocation
1334  *
1335  * \param inode device inode.
1336  * \param file_priv DRM file private.
1337  * \param cmd command.
1338  * \param arg a pointer to a drm_buf_desc structure.
1339  * \return zero on success or a negative number on failure.
1340  *
1341  * Verifies that the size order is bounded between the admissible orders and
1342  * updates the respective drm_device_dma::bufs entry low and high water mark.
1343  *
1344  * \note This ioctl is deprecated and mostly never used.
1345  */
1346 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1347                         struct drm_file *file_priv)
1348 {
1349         struct drm_device_dma *dma = dev->dma;
1350         struct drm_buf_desc *request = data;
1351         int order;
1352         struct drm_buf_entry *entry;
1353
1354         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1355                 return -EINVAL;
1356
1357         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1358                 return -EINVAL;
1359
1360         if (!dma)
1361                 return -EINVAL;
1362
1363         DRM_DEBUG("%d, %d, %d\n",
1364                   request->size, request->low_mark, request->high_mark);
1365         order = order_base_2(request->size);
1366         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1367                 return -EINVAL;
1368         entry = &dma->bufs[order];
1369
1370         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1371                 return -EINVAL;
1372         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1373                 return -EINVAL;
1374
1375         entry->low_mark = request->low_mark;
1376         entry->high_mark = request->high_mark;
1377
1378         return 0;
1379 }
1380
1381 /**
1382  * Unreserve the buffers in list, previously reserved using drmDMA.
1383  *
1384  * \param inode device inode.
1385  * \param file_priv DRM file private.
1386  * \param cmd command.
1387  * \param arg pointer to a drm_buf_free structure.
1388  * \return zero on success or a negative number on failure.
1389  *
1390  * Calls free_buffer() for each used buffer.
1391  * This function is primarily used for debugging.
1392  */
1393 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1394                         struct drm_file *file_priv)
1395 {
1396         struct drm_device_dma *dma = dev->dma;
1397         struct drm_buf_free *request = data;
1398         int i;
1399         int idx;
1400         struct drm_buf *buf;
1401
1402         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1403                 return -EINVAL;
1404
1405         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1406                 return -EINVAL;
1407
1408         if (!dma)
1409                 return -EINVAL;
1410
1411         DRM_DEBUG("%d\n", request->count);
1412         for (i = 0; i < request->count; i++) {
1413                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1414                         return -EFAULT;
1415                 if (idx < 0 || idx >= dma->buf_count) {
1416                         DRM_ERROR("Index %d (of %d max)\n",
1417                                   idx, dma->buf_count - 1);
1418                         return -EINVAL;
1419                 }
1420                 buf = dma->buflist[idx];
1421                 if (buf->file_priv != file_priv) {
1422                         DRM_ERROR("Process %d freeing buffer not owned\n",
1423                                   task_pid_nr(current));
1424                         return -EINVAL;
1425                 }
1426                 drm_legacy_free_buffer(dev, buf);
1427         }
1428
1429         return 0;
1430 }
1431
1432 /**
1433  * Maps all of the DMA buffers into client-virtual space (ioctl).
1434  *
1435  * \param inode device inode.
1436  * \param file_priv DRM file private.
1437  * \param cmd command.
1438  * \param arg pointer to a drm_buf_map structure.
1439  * \return zero on success or a negative number on failure.
1440  *
1441  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1442  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1443  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1444  * drm_mmap_dma().
1445  */
1446 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1447                          void __user **v,
1448                          int (*f)(void *, int, unsigned long,
1449                                   struct drm_buf *),
1450                          struct drm_file *file_priv)
1451 {
1452         struct drm_device_dma *dma = dev->dma;
1453         int retcode = 0;
1454         unsigned long virtual;
1455         int i;
1456
1457         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1458                 return -EINVAL;
1459
1460         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1461                 return -EINVAL;
1462
1463         if (!dma)
1464                 return -EINVAL;
1465
1466         spin_lock(&dev->buf_lock);
1467         if (atomic_read(&dev->buf_alloc)) {
1468                 spin_unlock(&dev->buf_lock);
1469                 return -EBUSY;
1470         }
1471         dev->buf_use++;         /* Can't allocate more after this call */
1472         spin_unlock(&dev->buf_lock);
1473
1474         if (*p >= dma->buf_count) {
1475                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1476                     || (drm_core_check_feature(dev, DRIVER_SG)
1477                         && (dma->flags & _DRM_DMA_USE_SG))) {
1478                         struct drm_local_map *map = dev->agp_buffer_map;
1479                         unsigned long token = dev->agp_buffer_token;
1480
1481                         if (!map) {
1482                                 retcode = -EINVAL;
1483                                 goto done;
1484                         }
1485                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1486                                           PROT_READ | PROT_WRITE,
1487                                           MAP_SHARED,
1488                                           token);
1489                 } else {
1490                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1491                                           PROT_READ | PROT_WRITE,
1492                                           MAP_SHARED, 0);
1493                 }
1494                 if (virtual > -1024UL) {
1495                         /* Real error */
1496                         retcode = (signed long)virtual;
1497                         goto done;
1498                 }
1499                 *v = (void __user *)virtual;
1500
1501                 for (i = 0; i < dma->buf_count; i++) {
1502                         if (f(data, i, virtual, dma->buflist[i]) < 0) {
1503                                 retcode = -EFAULT;
1504                                 goto done;
1505                         }
1506                 }
1507         }
1508       done:
1509         *p = dma->buf_count;
1510         DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1511
1512         return retcode;
1513 }
1514
1515 static int map_one_buf(void *data, int idx, unsigned long virtual,
1516                         struct drm_buf *buf)
1517 {
1518         struct drm_buf_map *request = data;
1519         unsigned long address = virtual + buf->offset;  /* *** */
1520
1521         if (copy_to_user(&request->list[idx].idx, &buf->idx,
1522                          sizeof(request->list[0].idx)))
1523                 return -EFAULT;
1524         if (copy_to_user(&request->list[idx].total, &buf->total,
1525                          sizeof(request->list[0].total)))
1526                 return -EFAULT;
1527         if (clear_user(&request->list[idx].used, sizeof(int)))
1528                 return -EFAULT;
1529         if (copy_to_user(&request->list[idx].address, &address,
1530                          sizeof(address)))
1531                 return -EFAULT;
1532         return 0;
1533 }
1534
1535 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1536                        struct drm_file *file_priv)
1537 {
1538         struct drm_buf_map *request = data;
1539         return __drm_legacy_mapbufs(dev, data, &request->count,
1540                                     &request->virtual, map_one_buf,
1541                                     file_priv);
1542 }
1543
1544 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1545                   struct drm_file *file_priv)
1546 {
1547         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1548                 return -EINVAL;
1549
1550         if (dev->driver->dma_ioctl)
1551                 return dev->driver->dma_ioctl(dev, data, file_priv);
1552         else
1553                 return -EINVAL;
1554 }
1555
1556 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1557 {
1558         struct drm_map_list *entry;
1559
1560         list_for_each_entry(entry, &dev->maplist, head) {
1561                 if (entry->map && entry->map->type == _DRM_SHM &&
1562                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1563                         return entry->map;
1564                 }
1565         }
1566         return NULL;
1567 }
1568 EXPORT_SYMBOL(drm_legacy_getsarea);