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 <[email protected]>
   9  * Author: Gareth Hughes <[email protected]>
  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/export.h>
  32 #include <linux/log2.h>
  33 #include <linux/mm.h>
  34 #include <linux/mman.h>
  35 #include <linux/nospec.h>
  36 #include <linux/pci.h>
  37 #include <linux/slab.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/vmalloc.h>
  40
  41 #include <asm/shmparam.h>
  42
  43 #include <drm/drm_device.h>
  44 #include <drm/drm_drv.h>
  45 #include <drm/drm_file.h>
  46 #include <drm/drm_print.h>
  47
  48 #include "drm_legacy.h"
  49
  50
  51 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  52                                                   struct drm_local_map *map)
  53 {
  54         struct drm_map_list *entry;
  55
  56         list_for_each_entry(entry, &dev->maplist, head) {
  57                 /*
  58                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  59                  * while PCI resources may live above that, we only compare the
  60                  * lower 32 bits of the map offset for maps of type
  61                  * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  62                  * It is assumed that if a driver have more than one resource
  63                  * of each type, the lower 32 bits are different.
  64                  */
  65                 if (!entry->map ||
  66                     map->type != entry->map->type ||
  67                     entry->master != dev->master)
  68                         continue;
  69                 switch (map->type) {
  70                 case _DRM_SHM:
  71                         if (map->flags != _DRM_CONTAINS_LOCK)
  72                                 break;
  73                         return entry;
  74                 case _DRM_REGISTERS:
  75                 case _DRM_FRAME_BUFFER:
  76                         if ((entry->map->offset & 0xffffffff) ==
  77                             (map->offset & 0xffffffff))
  78                                 return entry;
  79                         break;
  80                 default: /* Make gcc happy */
  81                         break;
  82                 }
  83                 if (entry->map->offset == map->offset)
  84                         return entry;
  85         }
  86
  87         return NULL;
  88 }
  89
  90 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  91                           unsigned long user_token, int hashed_handle, int shm)
  92 {
  93         int use_hashed_handle, shift;
  94         unsigned long add;
  95
  96 #if (BITS_PER_LONG == 64)
  97         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  98 #elif (BITS_PER_LONG == 32)
  99         use_hashed_handle = hashed_handle;
 100 #else
 101 #error Unsupported long size. Neither 64 nor 32 bits.
 102 #endif
 103
 104         if (!use_hashed_handle) {
 105                 int ret;
 106
 107                 hash->key = user_token >> PAGE_SHIFT;
 108                 ret = drm_ht_insert_item(&dev->map_hash, hash);
 109                 if (ret != -EINVAL)
 110                         return ret;
 111         }
 112
 113         shift = 0;
 114         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 115         if (shm && (SHMLBA > PAGE_SIZE)) {
 116                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 117
 118                 /* For shared memory, we have to preserve the SHMLBA
 119                  * bits of the eventual vma->vm_pgoff value during
 120                  * mmap().  Otherwise we run into cache aliasing problems
 121                  * on some platforms.  On these platforms, the pgoff of
 122                  * a mmap() request is used to pick a suitable virtual
 123                  * address for the mmap() region such that it will not
 124                  * cause cache aliasing problems.
 125                  *
 126                  * Therefore, make sure the SHMLBA relevant bits of the
 127                  * hash value we use are equal to those in the original
 128                  * kernel virtual address.
 129                  */
 130                 shift = bits;
 131                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 132         }
 133
 134         return drm_ht_just_insert_please(&dev->map_hash, hash,
 135                                          user_token, 32 - PAGE_SHIFT - 3,
 136                                          shift, add);
 137 }
 138
 139 /*
 140  * Core function to create a range of memory available for mapping by a
 141  * non-root process.
 142  *
 143  * Adjusts the memory offset to its absolute value according to the mapping
 144  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 145  * applicable and if supported by the kernel.
 146  */
 147 static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
 148                            unsigned int size, enum drm_map_type type,
 149                            enum drm_map_flags flags,
 150                            struct drm_map_list **maplist)
 151 {
 152         struct drm_local_map *map;
 153         struct drm_map_list *list;
 154         unsigned long user_token;
 155         int ret;
 156
 157         map = kmalloc(sizeof(*map), GFP_KERNEL);
 158         if (!map)
 159                 return -ENOMEM;
 160
 161         map->offset = offset;
 162         map->size = size;
 163         map->flags = flags;
 164         map->type = type;
 165
 166         /* Only allow shared memory to be removable since we only keep enough
 167          * book keeping information about shared memory to allow for removal
 168          * when processes fork.
 169          */
 170         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 171                 kfree(map);
 172                 return -EINVAL;
 173         }
 174         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 175                   (unsigned long long)map->offset, map->size, map->type);
 176
 177         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 178          * hole created by that and it works around various broken drivers that use
 179          * a non-aligned quantity to map the SAREA. --BenH
 180          */
 181         if (map->type == _DRM_SHM)
 182                 map->size = PAGE_ALIGN(map->size);
 183
 184         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 185                 kfree(map);
 186                 return -EINVAL;
 187         }
 188         map->mtrr = -1;
 189         map->handle = NULL;
 190
 191         switch (map->type) {
 192         case _DRM_REGISTERS:
 193         case _DRM_FRAME_BUFFER:
 194 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 195                 if (map->offset + (map->size-1) < map->offset ||
 196                     map->offset < virt_to_phys(high_memory)) {
 197                         kfree(map);
 198                         return -EINVAL;
 199                 }
 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 (map->type == _DRM_FRAME_BUFFER ||
 221                     (map->flags & _DRM_WRITE_COMBINING)) {
 222                         map->mtrr =
 223                                 arch_phys_wc_add(map->offset, map->size);
 224                 }
 225                 if (map->type == _DRM_REGISTERS) {
 226                         if (map->flags & _DRM_WRITE_COMBINING)
 227                                 map->handle = ioremap_wc(map->offset,
 228                                                          map->size);
 229                         else
 230                                 map->handle = ioremap(map->offset, map->size);
 231                         if (!map->handle) {
 232                                 kfree(map);
 233                                 return -ENOMEM;
 234                         }
 235                 }
 236
 237                 break;
 238         case _DRM_SHM:
 239                 list = drm_find_matching_map(dev, map);
 240                 if (list != NULL) {
 241                         if (list->map->size != map->size) {
 242                                 DRM_DEBUG("Matching maps of type %d with "
 243                                           "mismatched sizes, (%ld vs %ld)\n",
 244                                           map->type, map->size, list->map->size);
 245                                 list->map->size = map->size;
 246                         }
 247
 248                         kfree(map);
 249                         *maplist = list;
 250                         return 0;
 251                 }
 252                 map->handle = vmalloc_user(map->size);
 253                 DRM_DEBUG("%lu %d %p\n",
 254                           map->size, order_base_2(map->size), map->handle);
 255                 if (!map->handle) {
 256                         kfree(map);
 257                         return -ENOMEM;
 258                 }
 259                 map->offset = (unsigned long)map->handle;
 260                 if (map->flags & _DRM_CONTAINS_LOCK) {
 261                         /* Prevent a 2nd X Server from creating a 2nd lock */
 262                         if (dev->master->lock.hw_lock != NULL) {
 263                                 vfree(map->handle);
 264                                 kfree(map);
 265                                 return -EBUSY;
 266                         }
 267                         dev->sigdata.lock = dev->master->lock.hw_lock = map->handle;    /* Pointer to lock */
 268                 }
 269                 break;
 270         case _DRM_AGP: {
 271                 struct drm_agp_mem *entry;
 272                 int valid = 0;
 273
 274                 if (!dev->agp) {
 275                         kfree(map);
 276                         return -EINVAL;
 277                 }
 278 #ifdef __alpha__
 279                 map->offset += dev->hose->mem_space->start;
 280 #endif
 281                 /* In some cases (i810 driver), user space may have already
 282                  * added the AGP base itself, because dev->agp->base previously
 283                  * only got set during AGP enable.  So, only add the base
 284                  * address if the map's offset isn't already within the
 285                  * aperture.
 286                  */
 287                 if (map->offset < dev->agp->base ||
 288                     map->offset > dev->agp->base +
 289                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 290                         map->offset += dev->agp->base;
 291                 }
 292                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 293
 294                 /* This assumes the DRM is in total control of AGP space.
 295                  * It's not always the case as AGP can be in the control
 296                  * of user space (i.e. i810 driver). So this loop will get
 297                  * skipped and we double check that dev->agp->memory is
 298                  * actually set as well as being invalid before EPERM'ing
 299                  */
 300                 list_for_each_entry(entry, &dev->agp->memory, head) {
 301                         if ((map->offset >= entry->bound) &&
 302                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 303                                 valid = 1;
 304                                 break;
 305                         }
 306                 }
 307                 if (!list_empty(&dev->agp->memory) && !valid) {
 308                         kfree(map);
 309                         return -EPERM;
 310                 }
 311                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 312                           (unsigned long long)map->offset, map->size);
 313
 314                 break;
 315         }
 316         case _DRM_SCATTER_GATHER:
 317                 if (!dev->sg) {
 318                         kfree(map);
 319                         return -EINVAL;
 320                 }
 321                 map->offset += (unsigned long)dev->sg->virtual;
 322                 break;
 323         case _DRM_CONSISTENT:
 324                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 325                  * As we're limiting the address to 2^32-1 (or less),
 326                  * casting it down to 32 bits is no problem, but we
 327                  * need to point to a 64bit variable first.
 328                  */
 329                 map->handle = dma_alloc_coherent(dev->dev,
 330                                                  map->size,
 331                                                  &map->offset,
 332                                                  GFP_KERNEL);
 333                 if (!map->handle) {
 334                         kfree(map);
 335                         return -ENOMEM;
 336                 }
 337                 break;
 338         default:
 339                 kfree(map);
 340                 return -EINVAL;
 341         }
 342
 343         list = kzalloc(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         list->map = map;
 351
 352         mutex_lock(&dev->struct_mutex);
 353         list_add(&list->head, &dev->maplist);
 354
 355         /* Assign a 32-bit handle */
 356         /* We do it here so that dev->struct_mutex protects the increment */
 357         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 358                 map->offset;
 359         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 360                              (map->type == _DRM_SHM));
 361         if (ret) {
 362                 if (map->type == _DRM_REGISTERS)
 363                         iounmap(map->handle);
 364                 kfree(map);
 365                 kfree(list);
 366                 mutex_unlock(&dev->struct_mutex);
 367                 return ret;
 368         }
 369
 370         list->user_token = list->hash.key << PAGE_SHIFT;
 371         mutex_unlock(&dev->struct_mutex);
 372
 373         if (!(map->flags & _DRM_DRIVER))
 374                 list->master = dev->master;
 375         *maplist = list;
 376         return 0;
 377 }
 378
 379 int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
 380                       unsigned int size, enum drm_map_type type,
 381                       enum drm_map_flags flags, struct drm_local_map **map_ptr)
 382 {
 383         struct drm_map_list *list;
 384         int rc;
 385
 386         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 387         if (!rc)
 388                 *map_ptr = list->map;
 389         return rc;
 390 }
 391 EXPORT_SYMBOL(drm_legacy_addmap);
 392
 393 struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
 394                                          unsigned int token)
 395 {
 396         struct drm_map_list *_entry;
 397
 398         list_for_each_entry(_entry, &dev->maplist, head)
 399                 if (_entry->user_token == token)
 400                         return _entry->map;
 401         return NULL;
 402 }
 403 EXPORT_SYMBOL(drm_legacy_findmap);
 404
 405 /*
 406  * Ioctl to specify a range of memory that is available for mapping by a
 407  * non-root process.
 408  *
 409  * \param inode device inode.
 410  * \param file_priv DRM file private.
 411  * \param cmd command.
 412  * \param arg pointer to a drm_map structure.
 413  * \return zero on success or a negative value on error.
 414  *
 415  */
 416 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
 417                             struct drm_file *file_priv)
 418 {
 419         struct drm_map *map = data;
 420         struct drm_map_list *maplist;
 421         int err;
 422
 423         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 424                 return -EPERM;
 425
 426         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 427             !drm_core_check_feature(dev, DRIVER_LEGACY))
 428                 return -EOPNOTSUPP;
 429
 430         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 431                               map->flags, &maplist);
 432
 433         if (err)
 434                 return err;
 435
 436         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 437         map->handle = (void *)(unsigned long)maplist->user_token;
 438
 439         /*
 440          * It appears that there are no users of this value whatsoever --
 441          * drmAddMap just discards it.  Let's not encourage its use.
 442          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 443          *  it's not a real mtrr index anymore.)
 444          */
 445         map->mtrr = -1;
 446
 447         return 0;
 448 }
 449
 450 /*
 451  * Get a mapping information.
 452  *
 453  * \param inode device inode.
 454  * \param file_priv DRM file private.
 455  * \param cmd command.
 456  * \param arg user argument, pointing to a drm_map structure.
 457  *
 458  * \return zero on success or a negative number on failure.
 459  *
 460  * Searches for the mapping with the specified offset and copies its information
 461  * into userspace
 462  */
 463 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
 464                             struct drm_file *file_priv)
 465 {
 466         struct drm_map *map = data;
 467         struct drm_map_list *r_list = NULL;
 468         struct list_head *list;
 469         int idx;
 470         int i;
 471
 472         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 473             !drm_core_check_feature(dev, DRIVER_LEGACY))
 474                 return -EOPNOTSUPP;
 475
 476         idx = map->offset;
 477         if (idx < 0)
 478                 return -EINVAL;
 479
 480         i = 0;
 481         mutex_lock(&dev->struct_mutex);
 482         list_for_each(list, &dev->maplist) {
 483                 if (i == idx) {
 484                         r_list = list_entry(list, struct drm_map_list, head);
 485                         break;
 486                 }
 487                 i++;
 488         }
 489         if (!r_list || !r_list->map) {
 490                 mutex_unlock(&dev->struct_mutex);
 491                 return -EINVAL;
 492         }
 493
 494         map->offset = r_list->map->offset;
 495         map->size = r_list->map->size;
 496         map->type = r_list->map->type;
 497         map->flags = r_list->map->flags;
 498         map->handle = (void *)(unsigned long) r_list->user_token;
 499         map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
 500
 501         mutex_unlock(&dev->struct_mutex);
 502
 503         return 0;
 504 }
 505
 506 /*
 507  * Remove a map private from list and deallocate resources if the mapping
 508  * isn't in use.
 509  *
 510  * Searches the map on drm_device::maplist, removes it from the list, see if
 511  * it's being used, and free any associated resource (such as MTRR's) if it's not
 512  * being on use.
 513  *
 514  * \sa drm_legacy_addmap
 515  */
 516 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 517 {
 518         struct drm_map_list *r_list = NULL, *list_t;
 519         int found = 0;
 520         struct drm_master *master;
 521
 522         /* Find the list entry for the map and remove it */
 523         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 524                 if (r_list->map == map) {
 525                         master = r_list->master;
 526                         list_del(&r_list->head);
 527                         drm_ht_remove_key(&dev->map_hash,
 528                                           r_list->user_token >> PAGE_SHIFT);
 529                         kfree(r_list);
 530                         found = 1;
 531                         break;
 532                 }
 533         }
 534
 535         if (!found)
 536                 return -EINVAL;
 537
 538         switch (map->type) {
 539         case _DRM_REGISTERS:
 540                 iounmap(map->handle);
 541                 fallthrough;
 542         case _DRM_FRAME_BUFFER:
 543                 arch_phys_wc_del(map->mtrr);
 544                 break;
 545         case _DRM_SHM:
 546                 vfree(map->handle);
 547                 if (master) {
 548                         if (dev->sigdata.lock == master->lock.hw_lock)
 549                                 dev->sigdata.lock = NULL;
 550                         master->lock.hw_lock = NULL;   /* SHM removed */
 551                         master->lock.file_priv = NULL;
 552                         wake_up_interruptible_all(&master->lock.lock_queue);
 553                 }
 554                 break;
 555         case _DRM_AGP:
 556         case _DRM_SCATTER_GATHER:
 557                 break;
 558         case _DRM_CONSISTENT:
 559                 dma_free_coherent(dev->dev,
 560                                   map->size,
 561                                   map->handle,
 562                                   map->offset);
 563                 break;
 564         }
 565         kfree(map);
 566
 567         return 0;
 568 }
 569 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
 570
 571 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
 572 {
 573         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 574             !drm_core_check_feature(dev, DRIVER_LEGACY))
 575                 return;
 576
 577         mutex_lock(&dev->struct_mutex);
 578         drm_legacy_rmmap_locked(dev, map);
 579         mutex_unlock(&dev->struct_mutex);
 580 }
 581 EXPORT_SYMBOL(drm_legacy_rmmap);
 582
 583 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
 584 {
 585         struct drm_map_list *r_list, *list_temp;
 586
 587         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 588                 return;
 589
 590         mutex_lock(&dev->struct_mutex);
 591         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 592                 if (r_list->master == master) {
 593                         drm_legacy_rmmap_locked(dev, r_list->map);
 594                         r_list = NULL;
 595                 }
 596         }
 597         mutex_unlock(&dev->struct_mutex);
 598 }
 599
 600 void drm_legacy_rmmaps(struct drm_device *dev)
 601 {
 602         struct drm_map_list *r_list, *list_temp;
 603
 604         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
 605                 drm_legacy_rmmap(dev, r_list->map);
 606 }
 607
 608 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 609  * the last close of the device, and this is necessary for cleanup when things
 610  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 611  * like a pointless exercise since they're going away anyway.
 612  *
 613  * One use case might be after addmap is allowed for normal users for SHM and
 614  * gets used by drivers that the server doesn't need to care about.  This seems
 615  * unlikely.
 616  *
 617  * \param inode device inode.
 618  * \param file_priv DRM file private.
 619  * \param cmd command.
 620  * \param arg pointer to a struct drm_map structure.
 621  * \return zero on success or a negative value on error.
 622  */
 623 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
 624                            struct drm_file *file_priv)
 625 {
 626         struct drm_map *request = data;
 627         struct drm_local_map *map = NULL;
 628         struct drm_map_list *r_list;
 629         int ret;
 630
 631         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 632             !drm_core_check_feature(dev, DRIVER_LEGACY))
 633                 return -EOPNOTSUPP;
 634
 635         mutex_lock(&dev->struct_mutex);
 636         list_for_each_entry(r_list, &dev->maplist, head) {
 637                 if (r_list->map &&
 638                     r_list->user_token == (unsigned long)request->handle &&
 639                     r_list->map->flags & _DRM_REMOVABLE) {
 640                         map = r_list->map;
 641                         break;
 642                 }
 643         }
 644
 645         /* List has wrapped around to the head pointer, or it's empty we didn't
 646          * find anything.
 647          */
 648         if (list_empty(&dev->maplist) || !map) {
 649                 mutex_unlock(&dev->struct_mutex);
 650                 return -EINVAL;
 651         }
 652
 653         /* Register and framebuffer maps are permanent */
 654         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 655                 mutex_unlock(&dev->struct_mutex);
 656                 return 0;
 657         }
 658
 659         ret = drm_legacy_rmmap_locked(dev, map);
 660
 661         mutex_unlock(&dev->struct_mutex);
 662
 663         return ret;
 664 }
 665
 666 /*
 667  * Cleanup after an error on one of the addbufs() functions.
 668  *
 669  * \param dev DRM device.
 670  * \param entry buffer entry where the error occurred.
 671  *
 672  * Frees any pages and buffers associated with the given entry.
 673  */
 674 static void drm_cleanup_buf_error(struct drm_device *dev,
 675                                   struct drm_buf_entry *entry)
 676 {
 677         drm_dma_handle_t *dmah;
 678         int i;
 679
 680         if (entry->seg_count) {
 681                 for (i = 0; i < entry->seg_count; i++) {
 682                         if (entry->seglist[i]) {
 683                                 dmah = entry->seglist[i];
 684                                 dma_free_coherent(dev->dev,
 685                                                   dmah->size,
 686                                                   dmah->vaddr,
 687                                                   dmah->busaddr);
 688                         }
 689                 }
 690                 kfree(entry->seglist);
 691
 692                 entry->seg_count = 0;
 693         }
 694
 695         if (entry->buf_count) {
 696                 for (i = 0; i < entry->buf_count; i++) {
 697                         kfree(entry->buflist[i].dev_private);
 698                 }
 699                 kfree(entry->buflist);
 700
 701                 entry->buf_count = 0;
 702         }
 703 }
 704
 705 #if IS_ENABLED(CONFIG_AGP)
 706 /*
 707  * Add AGP buffers for DMA transfers.
 708  *
 709  * \param dev struct drm_device to which the buffers are to be added.
 710  * \param request pointer to a struct drm_buf_desc describing the request.
 711  * \return zero on success or a negative number on failure.
 712  *
 713  * After some sanity checks creates a drm_buf structure for each buffer and
 714  * reallocates the buffer list of the same size order to accommodate the new
 715  * buffers.
 716  */
 717 int drm_legacy_addbufs_agp(struct drm_device *dev,
 718                            struct drm_buf_desc *request)
 719 {
 720         struct drm_device_dma *dma = dev->dma;
 721         struct drm_buf_entry *entry;
 722         struct drm_agp_mem *agp_entry;
 723         struct drm_buf *buf;
 724         unsigned long offset;
 725         unsigned long agp_offset;
 726         int count;
 727         int order;
 728         int size;
 729         int alignment;
 730         int page_order;
 731         int total;
 732         int byte_count;
 733         int i, valid;
 734         struct drm_buf **temp_buflist;
 735
 736         if (!dma)
 737                 return -EINVAL;
 738
 739         count = request->count;
 740         order = order_base_2(request->size);
 741         size = 1 << order;
 742
 743         alignment = (request->flags & _DRM_PAGE_ALIGN)
 744             ? PAGE_ALIGN(size) : size;
 745         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 746         total = PAGE_SIZE << page_order;
 747
 748         byte_count = 0;
 749         agp_offset = dev->agp->base + request->agp_start;
 750
 751         DRM_DEBUG("count:      %d\n", count);
 752         DRM_DEBUG("order:      %d\n", order);
 753         DRM_DEBUG("size:       %d\n", size);
 754         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 755         DRM_DEBUG("alignment:  %d\n", alignment);
 756         DRM_DEBUG("page_order: %d\n", page_order);
 757         DRM_DEBUG("total:      %d\n", total);
 758
 759         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 760                 return -EINVAL;
 761
 762         /* Make sure buffers are located in AGP memory that we own */
 763         valid = 0;
 764         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 765                 if ((agp_offset >= agp_entry->bound) &&
 766                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 767                         valid = 1;
 768                         break;
 769                 }
 770         }
 771         if (!list_empty(&dev->agp->memory) && !valid) {
 772                 DRM_DEBUG("zone invalid\n");
 773                 return -EINVAL;
 774         }
 775         spin_lock(&dev->buf_lock);
 776         if (dev->buf_use) {
 777                 spin_unlock(&dev->buf_lock);
 778                 return -EBUSY;
 779         }
 780         atomic_inc(&dev->buf_alloc);
 781         spin_unlock(&dev->buf_lock);
 782
 783         mutex_lock(&dev->struct_mutex);
 784         entry = &dma->bufs[order];
 785         if (entry->buf_count) {
 786                 mutex_unlock(&dev->struct_mutex);
 787                 atomic_dec(&dev->buf_alloc);
 788                 return -ENOMEM; /* May only call once for each order */
 789         }
 790
 791         if (count < 0 || count > 4096) {
 792                 mutex_unlock(&dev->struct_mutex);
 793                 atomic_dec(&dev->buf_alloc);
 794                 return -EINVAL;
 795         }
 796
 797         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 798         if (!entry->buflist) {
 799                 mutex_unlock(&dev->struct_mutex);
 800                 atomic_dec(&dev->buf_alloc);
 801                 return -ENOMEM;
 802         }
 803
 804         entry->buf_size = size;
 805         entry->page_order = page_order;
 806
 807         offset = 0;
 808
 809         while (entry->buf_count < count) {
 810                 buf = &entry->buflist[entry->buf_count];
 811                 buf->idx = dma->buf_count + entry->buf_count;
 812                 buf->total = alignment;
 813                 buf->order = order;
 814                 buf->used = 0;
 815
 816                 buf->offset = (dma->byte_count + offset);
 817                 buf->bus_address = agp_offset + offset;
 818                 buf->address = (void *)(agp_offset + offset);
 819                 buf->next = NULL;
 820                 buf->waiting = 0;
 821                 buf->pending = 0;
 822                 buf->file_priv = NULL;
 823
 824                 buf->dev_priv_size = dev->driver->dev_priv_size;
 825                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 826                 if (!buf->dev_private) {
 827                         /* Set count correctly so we free the proper amount. */
 828                         entry->buf_count = count;
 829                         drm_cleanup_buf_error(dev, entry);
 830                         mutex_unlock(&dev->struct_mutex);
 831                         atomic_dec(&dev->buf_alloc);
 832                         return -ENOMEM;
 833                 }
 834
 835                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 836
 837                 offset += alignment;
 838                 entry->buf_count++;
 839                 byte_count += PAGE_SIZE << page_order;
 840         }
 841
 842         DRM_DEBUG("byte_count: %d\n", byte_count);
 843
 844         temp_buflist = krealloc(dma->buflist,
 845                                 (dma->buf_count + entry->buf_count) *
 846                                 sizeof(*dma->buflist), GFP_KERNEL);
 847         if (!temp_buflist) {
 848                 /* Free the entry because it isn't valid */
 849                 drm_cleanup_buf_error(dev, entry);
 850                 mutex_unlock(&dev->struct_mutex);
 851                 atomic_dec(&dev->buf_alloc);
 852                 return -ENOMEM;
 853         }
 854         dma->buflist = temp_buflist;
 855
 856         for (i = 0; i < entry->buf_count; i++) {
 857                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 858         }
 859
 860         dma->buf_count += entry->buf_count;
 861         dma->seg_count += entry->seg_count;
 862         dma->page_count += byte_count >> PAGE_SHIFT;
 863         dma->byte_count += byte_count;
 864
 865         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 866         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 867
 868         mutex_unlock(&dev->struct_mutex);
 869
 870         request->count = entry->buf_count;
 871         request->size = size;
 872
 873         dma->flags = _DRM_DMA_USE_AGP;
 874
 875         atomic_dec(&dev->buf_alloc);
 876         return 0;
 877 }
 878 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
 879 #endif /* CONFIG_AGP */
 880
 881 int drm_legacy_addbufs_pci(struct drm_device *dev,
 882                            struct drm_buf_desc *request)
 883 {
 884         struct drm_device_dma *dma = dev->dma;
 885         int count;
 886         int order;
 887         int size;
 888         int total;
 889         int page_order;
 890         struct drm_buf_entry *entry;
 891         drm_dma_handle_t *dmah;
 892         struct drm_buf *buf;
 893         int alignment;
 894         unsigned long offset;
 895         int i;
 896         int byte_count;
 897         int page_count;
 898         unsigned long *temp_pagelist;
 899         struct drm_buf **temp_buflist;
 900
 901         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 902                 return -EOPNOTSUPP;
 903
 904         if (!dma)
 905                 return -EINVAL;
 906
 907         if (!capable(CAP_SYS_ADMIN))
 908                 return -EPERM;
 909
 910         count = request->count;
 911         order = order_base_2(request->size);
 912         size = 1 << order;
 913
 914         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 915                   request->count, request->size, size, order);
 916
 917         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 918                 return -EINVAL;
 919
 920         alignment = (request->flags & _DRM_PAGE_ALIGN)
 921             ? PAGE_ALIGN(size) : size;
 922         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 923         total = PAGE_SIZE << page_order;
 924
 925         spin_lock(&dev->buf_lock);
 926         if (dev->buf_use) {
 927                 spin_unlock(&dev->buf_lock);
 928                 return -EBUSY;
 929         }
 930         atomic_inc(&dev->buf_alloc);
 931         spin_unlock(&dev->buf_lock);
 932
 933         mutex_lock(&dev->struct_mutex);
 934         entry = &dma->bufs[order];
 935         if (entry->buf_count) {
 936                 mutex_unlock(&dev->struct_mutex);
 937                 atomic_dec(&dev->buf_alloc);
 938                 return -ENOMEM; /* May only call once for each order */
 939         }
 940
 941         if (count < 0 || count > 4096) {
 942                 mutex_unlock(&dev->struct_mutex);
 943                 atomic_dec(&dev->buf_alloc);
 944                 return -EINVAL;
 945         }
 946
 947         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 948         if (!entry->buflist) {
 949                 mutex_unlock(&dev->struct_mutex);
 950                 atomic_dec(&dev->buf_alloc);
 951                 return -ENOMEM;
 952         }
 953
 954         entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
 955         if (!entry->seglist) {
 956                 kfree(entry->buflist);
 957                 mutex_unlock(&dev->struct_mutex);
 958                 atomic_dec(&dev->buf_alloc);
 959                 return -ENOMEM;
 960         }
 961
 962         /* Keep the original pagelist until we know all the allocations
 963          * have succeeded
 964          */
 965         temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
 966                                       sizeof(*dma->pagelist),
 967                                       GFP_KERNEL);
 968         if (!temp_pagelist) {
 969                 kfree(entry->buflist);
 970                 kfree(entry->seglist);
 971                 mutex_unlock(&dev->struct_mutex);
 972                 atomic_dec(&dev->buf_alloc);
 973                 return -ENOMEM;
 974         }
 975         memcpy(temp_pagelist,
 976                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 977         DRM_DEBUG("pagelist: %d entries\n",
 978                   dma->page_count + (count << page_order));
 979
 980         entry->buf_size = size;
 981         entry->page_order = page_order;
 982         byte_count = 0;
 983         page_count = 0;
 984
 985         while (entry->buf_count < count) {
 986                 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
 987                 if (!dmah)
 988                         return -ENOMEM;
 989
 990                 dmah->size = total;
 991                 dmah->vaddr = dma_alloc_coherent(dev->dev,
 992                                                  dmah->size,
 993                                                  &dmah->busaddr,
 994                                                  GFP_KERNEL);
 995                 if (!dmah->vaddr) {
 996                         kfree(dmah);
 997
 998                         /* Set count correctly so we free the proper amount. */
 999                         entry->buf_count = count;
1000                         entry->seg_count = count;
1001                         drm_cleanup_buf_error(dev, entry);
1002                         kfree(temp_pagelist);
1003                         mutex_unlock(&dev->struct_mutex);
1004                         atomic_dec(&dev->buf_alloc);
1005                         return -ENOMEM;
1006                 }
1007                 entry->seglist[entry->seg_count++] = dmah;
1008                 for (i = 0; i < (1 << page_order); i++) {
1009                         DRM_DEBUG("page %d @ 0x%08lx\n",
1010                                   dma->page_count + page_count,
1011                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
1012                         temp_pagelist[dma->page_count + page_count++]
1013                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
1014                 }
1015                 for (offset = 0;
1016                      offset + size <= total && entry->buf_count < count;
1017                      offset += alignment, ++entry->buf_count) {
1018                         buf = &entry->buflist[entry->buf_count];
1019                         buf->idx = dma->buf_count + entry->buf_count;
1020                         buf->total = alignment;
1021                         buf->order = order;
1022                         buf->used = 0;
1023                         buf->offset = (dma->byte_count + byte_count + offset);
1024                         buf->address = (void *)(dmah->vaddr + offset);
1025                         buf->bus_address = dmah->busaddr + offset;
1026                         buf->next = NULL;
1027                         buf->waiting = 0;
1028                         buf->pending = 0;
1029                         buf->file_priv = NULL;
1030
1031                         buf->dev_priv_size = dev->driver->dev_priv_size;
1032                         buf->dev_private = kzalloc(buf->dev_priv_size,
1033                                                 GFP_KERNEL);
1034                         if (!buf->dev_private) {
1035                                 /* Set count correctly so we free the proper amount. */
1036                                 entry->buf_count = count;
1037                                 entry->seg_count = count;
1038                                 drm_cleanup_buf_error(dev, entry);
1039                                 kfree(temp_pagelist);
1040                                 mutex_unlock(&dev->struct_mutex);
1041                                 atomic_dec(&dev->buf_alloc);
1042                                 return -ENOMEM;
1043                         }
1044
1045                         DRM_DEBUG("buffer %d @ %p\n",
1046                                   entry->buf_count, buf->address);
1047                 }
1048                 byte_count += PAGE_SIZE << page_order;
1049         }
1050
1051         temp_buflist = krealloc(dma->buflist,
1052                                 (dma->buf_count + entry->buf_count) *
1053                                 sizeof(*dma->buflist), GFP_KERNEL);
1054         if (!temp_buflist) {
1055                 /* Free the entry because it isn't valid */
1056                 drm_cleanup_buf_error(dev, entry);
1057                 kfree(temp_pagelist);
1058                 mutex_unlock(&dev->struct_mutex);
1059                 atomic_dec(&dev->buf_alloc);
1060                 return -ENOMEM;
1061         }
1062         dma->buflist = temp_buflist;
1063
1064         for (i = 0; i < entry->buf_count; i++) {
1065                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1066         }
1067
1068         /* No allocations failed, so now we can replace the original pagelist
1069          * with the new one.
1070          */
1071         if (dma->page_count) {
1072                 kfree(dma->pagelist);
1073         }
1074         dma->pagelist = temp_pagelist;
1075
1076         dma->buf_count += entry->buf_count;
1077         dma->seg_count += entry->seg_count;
1078         dma->page_count += entry->seg_count << page_order;
1079         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1080
1081         mutex_unlock(&dev->struct_mutex);
1082
1083         request->count = entry->buf_count;
1084         request->size = size;
1085
1086         if (request->flags & _DRM_PCI_BUFFER_RO)
1087                 dma->flags = _DRM_DMA_USE_PCI_RO;
1088
1089         atomic_dec(&dev->buf_alloc);
1090         return 0;
1091
1092 }
1093 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1094
1095 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1096                                  struct drm_buf_desc *request)
1097 {
1098         struct drm_device_dma *dma = dev->dma;
1099         struct drm_buf_entry *entry;
1100         struct drm_buf *buf;
1101         unsigned long offset;
1102         unsigned long agp_offset;
1103         int count;
1104         int order;
1105         int size;
1106         int alignment;
1107         int page_order;
1108         int total;
1109         int byte_count;
1110         int i;
1111         struct drm_buf **temp_buflist;
1112
1113         if (!drm_core_check_feature(dev, DRIVER_SG))
1114                 return -EOPNOTSUPP;
1115
1116         if (!dma)
1117                 return -EINVAL;
1118
1119         if (!capable(CAP_SYS_ADMIN))
1120                 return -EPERM;
1121
1122         count = request->count;
1123         order = order_base_2(request->size);
1124         size = 1 << order;
1125
1126         alignment = (request->flags & _DRM_PAGE_ALIGN)
1127             ? PAGE_ALIGN(size) : size;
1128         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1129         total = PAGE_SIZE << page_order;
1130
1131         byte_count = 0;
1132         agp_offset = request->agp_start;
1133
1134         DRM_DEBUG("count:      %d\n", count);
1135         DRM_DEBUG("order:      %d\n", order);
1136         DRM_DEBUG("size:       %d\n", size);
1137         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1138         DRM_DEBUG("alignment:  %d\n", alignment);
1139         DRM_DEBUG("page_order: %d\n", page_order);
1140         DRM_DEBUG("total:      %d\n", total);
1141
1142         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1143                 return -EINVAL;
1144
1145         spin_lock(&dev->buf_lock);
1146         if (dev->buf_use) {
1147                 spin_unlock(&dev->buf_lock);
1148                 return -EBUSY;
1149         }
1150         atomic_inc(&dev->buf_alloc);
1151         spin_unlock(&dev->buf_lock);
1152
1153         mutex_lock(&dev->struct_mutex);
1154         entry = &dma->bufs[order];
1155         if (entry->buf_count) {
1156                 mutex_unlock(&dev->struct_mutex);
1157                 atomic_dec(&dev->buf_alloc);
1158                 return -ENOMEM; /* May only call once for each order */
1159         }
1160
1161         if (count < 0 || count > 4096) {
1162                 mutex_unlock(&dev->struct_mutex);
1163                 atomic_dec(&dev->buf_alloc);
1164                 return -EINVAL;
1165         }
1166
1167         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1168         if (!entry->buflist) {
1169                 mutex_unlock(&dev->struct_mutex);
1170                 atomic_dec(&dev->buf_alloc);
1171                 return -ENOMEM;
1172         }
1173
1174         entry->buf_size = size;
1175         entry->page_order = page_order;
1176
1177         offset = 0;
1178
1179         while (entry->buf_count < count) {
1180                 buf = &entry->buflist[entry->buf_count];
1181                 buf->idx = dma->buf_count + entry->buf_count;
1182                 buf->total = alignment;
1183                 buf->order = order;
1184                 buf->used = 0;
1185
1186                 buf->offset = (dma->byte_count + offset);
1187                 buf->bus_address = agp_offset + offset;
1188                 buf->address = (void *)(agp_offset + offset
1189                                         + (unsigned long)dev->sg->virtual);
1190                 buf->next = NULL;
1191                 buf->waiting = 0;
1192                 buf->pending = 0;
1193                 buf->file_priv = NULL;
1194
1195                 buf->dev_priv_size = dev->driver->dev_priv_size;
1196                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1197                 if (!buf->dev_private) {
1198                         /* Set count correctly so we free the proper amount. */
1199                         entry->buf_count = count;
1200                         drm_cleanup_buf_error(dev, entry);
1201                         mutex_unlock(&dev->struct_mutex);
1202                         atomic_dec(&dev->buf_alloc);
1203                         return -ENOMEM;
1204                 }
1205
1206                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1207
1208                 offset += alignment;
1209                 entry->buf_count++;
1210                 byte_count += PAGE_SIZE << page_order;
1211         }
1212
1213         DRM_DEBUG("byte_count: %d\n", byte_count);
1214
1215         temp_buflist = krealloc(dma->buflist,
1216                                 (dma->buf_count + entry->buf_count) *
1217                                 sizeof(*dma->buflist), GFP_KERNEL);
1218         if (!temp_buflist) {
1219                 /* Free the entry because it isn't valid */
1220                 drm_cleanup_buf_error(dev, entry);
1221                 mutex_unlock(&dev->struct_mutex);
1222                 atomic_dec(&dev->buf_alloc);
1223                 return -ENOMEM;
1224         }
1225         dma->buflist = temp_buflist;
1226
1227         for (i = 0; i < entry->buf_count; i++) {
1228                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1229         }
1230
1231         dma->buf_count += entry->buf_count;
1232         dma->seg_count += entry->seg_count;
1233         dma->page_count += byte_count >> PAGE_SHIFT;
1234         dma->byte_count += byte_count;
1235
1236         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1237         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1238
1239         mutex_unlock(&dev->struct_mutex);
1240
1241         request->count = entry->buf_count;
1242         request->size = size;
1243
1244         dma->flags = _DRM_DMA_USE_SG;
1245
1246         atomic_dec(&dev->buf_alloc);
1247         return 0;
1248 }
1249
1250 /*
1251  * Add buffers for DMA transfers (ioctl).
1252  *
1253  * \param inode device inode.
1254  * \param file_priv DRM file private.
1255  * \param cmd command.
1256  * \param arg pointer to a struct drm_buf_desc request.
1257  * \return zero on success or a negative number on failure.
1258  *
1259  * According with the memory type specified in drm_buf_desc::flags and the
1260  * build options, it dispatches the call either to addbufs_agp(),
1261  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1262  * PCI memory respectively.
1263  */
1264 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1265                        struct drm_file *file_priv)
1266 {
1267         struct drm_buf_desc *request = data;
1268         int ret;
1269
1270         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1271                 return -EOPNOTSUPP;
1272
1273         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1274                 return -EOPNOTSUPP;
1275
1276 #if IS_ENABLED(CONFIG_AGP)
1277         if (request->flags & _DRM_AGP_BUFFER)
1278                 ret = drm_legacy_addbufs_agp(dev, request);
1279         else
1280 #endif
1281         if (request->flags & _DRM_SG_BUFFER)
1282                 ret = drm_legacy_addbufs_sg(dev, request);
1283         else if (request->flags & _DRM_FB_BUFFER)
1284                 ret = -EINVAL;
1285         else
1286                 ret = drm_legacy_addbufs_pci(dev, request);
1287
1288         return ret;
1289 }
1290
1291 /*
1292  * Get information about the buffer mappings.
1293  *
1294  * This was originally mean for debugging purposes, or by a sophisticated
1295  * client library to determine how best to use the available buffers (e.g.,
1296  * large buffers can be used for image transfer).
1297  *
1298  * \param inode device inode.
1299  * \param file_priv DRM file private.
1300  * \param cmd command.
1301  * \param arg pointer to a drm_buf_info structure.
1302  * \return zero on success or a negative number on failure.
1303  *
1304  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1305  * lock, preventing of allocating more buffers after this call. Information
1306  * about each requested buffer is then copied into user space.
1307  */
1308 int __drm_legacy_infobufs(struct drm_device *dev,
1309                         void *data, int *p,
1310                         int (*f)(void *, int, struct drm_buf_entry *))
1311 {
1312         struct drm_device_dma *dma = dev->dma;
1313         int i;
1314         int count;
1315
1316         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1317                 return -EOPNOTSUPP;
1318
1319         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1320                 return -EOPNOTSUPP;
1321
1322         if (!dma)
1323                 return -EINVAL;
1324
1325         spin_lock(&dev->buf_lock);
1326         if (atomic_read(&dev->buf_alloc)) {
1327                 spin_unlock(&dev->buf_lock);
1328                 return -EBUSY;
1329         }
1330         ++dev->buf_use;         /* Can't allocate more after this call */
1331         spin_unlock(&dev->buf_lock);
1332
1333         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1334                 if (dma->bufs[i].buf_count)
1335                         ++count;
1336         }
1337
1338         DRM_DEBUG("count = %d\n", count);
1339
1340         if (*p >= count) {
1341                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1342                         struct drm_buf_entry *from = &dma->bufs[i];
1343
1344                         if (from->buf_count) {
1345                                 if (f(data, count, from) < 0)
1346                                         return -EFAULT;
1347                                 DRM_DEBUG("%d %d %d %d %d\n",
1348                                           i,
1349                                           dma->bufs[i].buf_count,
1350                                           dma->bufs[i].buf_size,
1351                                           dma->bufs[i].low_mark,
1352                                           dma->bufs[i].high_mark);
1353                                 ++count;
1354                         }
1355                 }
1356         }
1357         *p = count;
1358
1359         return 0;
1360 }
1361
1362 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1363 {
1364         struct drm_buf_info *request = data;
1365         struct drm_buf_desc __user *to = &request->list[count];
1366         struct drm_buf_desc v = {.count = from->buf_count,
1367                                  .size = from->buf_size,
1368                                  .low_mark = from->low_mark,
1369                                  .high_mark = from->high_mark};
1370
1371         if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1372                 return -EFAULT;
1373         return 0;
1374 }
1375
1376 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1377                         struct drm_file *file_priv)
1378 {
1379         struct drm_buf_info *request = data;
1380
1381         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1382 }
1383
1384 /*
1385  * Specifies a low and high water mark for buffer allocation
1386  *
1387  * \param inode device inode.
1388  * \param file_priv DRM file private.
1389  * \param cmd command.
1390  * \param arg a pointer to a drm_buf_desc structure.
1391  * \return zero on success or a negative number on failure.
1392  *
1393  * Verifies that the size order is bounded between the admissible orders and
1394  * updates the respective drm_device_dma::bufs entry low and high water mark.
1395  *
1396  * \note This ioctl is deprecated and mostly never used.
1397  */
1398 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1399                         struct drm_file *file_priv)
1400 {
1401         struct drm_device_dma *dma = dev->dma;
1402         struct drm_buf_desc *request = data;
1403         int order;
1404         struct drm_buf_entry *entry;
1405
1406         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1407                 return -EOPNOTSUPP;
1408
1409         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1410                 return -EOPNOTSUPP;
1411
1412         if (!dma)
1413                 return -EINVAL;
1414
1415         DRM_DEBUG("%d, %d, %d\n",
1416                   request->size, request->low_mark, request->high_mark);
1417         order = order_base_2(request->size);
1418         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1419                 return -EINVAL;
1420         entry = &dma->bufs[order];
1421
1422         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1423                 return -EINVAL;
1424         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1425                 return -EINVAL;
1426
1427         entry->low_mark = request->low_mark;
1428         entry->high_mark = request->high_mark;
1429
1430         return 0;
1431 }
1432
1433 /*
1434  * Unreserve the buffers in list, previously reserved using drmDMA.
1435  *
1436  * \param inode device inode.
1437  * \param file_priv DRM file private.
1438  * \param cmd command.
1439  * \param arg pointer to a drm_buf_free structure.
1440  * \return zero on success or a negative number on failure.
1441  *
1442  * Calls free_buffer() for each used buffer.
1443  * This function is primarily used for debugging.
1444  */
1445 int drm_legacy_freebufs(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_free *request = data;
1450         int i;
1451         int idx;
1452         struct drm_buf *buf;
1453
1454         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1455                 return -EOPNOTSUPP;
1456
1457         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1458                 return -EOPNOTSUPP;
1459
1460         if (!dma)
1461                 return -EINVAL;
1462
1463         DRM_DEBUG("%d\n", request->count);
1464         for (i = 0; i < request->count; i++) {
1465                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1466                         return -EFAULT;
1467                 if (idx < 0 || idx >= dma->buf_count) {
1468                         DRM_ERROR("Index %d (of %d max)\n",
1469                                   idx, dma->buf_count - 1);
1470                         return -EINVAL;
1471                 }
1472                 idx = array_index_nospec(idx, dma->buf_count);
1473                 buf = dma->buflist[idx];
1474                 if (buf->file_priv != file_priv) {
1475                         DRM_ERROR("Process %d freeing buffer not owned\n",
1476                                   task_pid_nr(current));
1477                         return -EINVAL;
1478                 }
1479                 drm_legacy_free_buffer(dev, buf);
1480         }
1481
1482         return 0;
1483 }
1484
1485 /*
1486  * Maps all of the DMA buffers into client-virtual space (ioctl).
1487  *
1488  * \param inode device inode.
1489  * \param file_priv DRM file private.
1490  * \param cmd command.
1491  * \param arg pointer to a drm_buf_map structure.
1492  * \return zero on success or a negative number on failure.
1493  *
1494  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1495  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1496  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1497  * drm_mmap_dma().
1498  */
1499 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1500                          void __user **v,
1501                          int (*f)(void *, int, unsigned long,
1502                                  struct drm_buf *),
1503                                  struct drm_file *file_priv)
1504 {
1505         struct drm_device_dma *dma = dev->dma;
1506         int retcode = 0;
1507         unsigned long virtual;
1508         int i;
1509
1510         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1511                 return -EOPNOTSUPP;
1512
1513         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1514                 return -EOPNOTSUPP;
1515
1516         if (!dma)
1517                 return -EINVAL;
1518
1519         spin_lock(&dev->buf_lock);
1520         if (atomic_read(&dev->buf_alloc)) {
1521                 spin_unlock(&dev->buf_lock);
1522                 return -EBUSY;
1523         }
1524         dev->buf_use++;         /* Can't allocate more after this call */
1525         spin_unlock(&dev->buf_lock);
1526
1527         if (*p >= dma->buf_count) {
1528                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1529                     || (drm_core_check_feature(dev, DRIVER_SG)
1530                         && (dma->flags & _DRM_DMA_USE_SG))) {
1531                         struct drm_local_map *map = dev->agp_buffer_map;
1532                         unsigned long token = dev->agp_buffer_token;
1533
1534                         if (!map) {
1535                                 retcode = -EINVAL;
1536                                 goto done;
1537                         }
1538                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1539                                           PROT_READ | PROT_WRITE,
1540                                           MAP_SHARED,
1541                                           token);
1542                 } else {
1543                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1544                                           PROT_READ | PROT_WRITE,
1545                                           MAP_SHARED, 0);
1546                 }
1547                 if (virtual > -1024UL) {
1548                         /* Real error */
1549                         retcode = (signed long)virtual;
1550                         goto done;
1551                 }
1552                 *v = (void __user *)virtual;
1553
1554                 for (i = 0; i < dma->buf_count; i++) {
1555                         if (f(data, i, virtual, dma->buflist[i]) < 0) {
1556                                 retcode = -EFAULT;
1557                                 goto done;
1558                         }
1559                 }
1560         }
1561       done:
1562         *p = dma->buf_count;
1563         DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1564
1565         return retcode;
1566 }
1567
1568 static int map_one_buf(void *data, int idx, unsigned long virtual,
1569                         struct drm_buf *buf)
1570 {
1571         struct drm_buf_map *request = data;
1572         unsigned long address = virtual + buf->offset;  /* *** */
1573
1574         if (copy_to_user(&request->list[idx].idx, &buf->idx,
1575                          sizeof(request->list[0].idx)))
1576                 return -EFAULT;
1577         if (copy_to_user(&request->list[idx].total, &buf->total,
1578                          sizeof(request->list[0].total)))
1579                 return -EFAULT;
1580         if (clear_user(&request->list[idx].used, sizeof(int)))
1581                 return -EFAULT;
1582         if (copy_to_user(&request->list[idx].address, &address,
1583                          sizeof(address)))
1584                 return -EFAULT;
1585         return 0;
1586 }
1587
1588 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1589                        struct drm_file *file_priv)
1590 {
1591         struct drm_buf_map *request = data;
1592
1593         return __drm_legacy_mapbufs(dev, data, &request->count,
1594                                     &request->virtual, map_one_buf,
1595                                     file_priv);
1596 }
1597
1598 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1599                   struct drm_file *file_priv)
1600 {
1601         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1602                 return -EOPNOTSUPP;
1603
1604         if (dev->driver->dma_ioctl)
1605                 return dev->driver->dma_ioctl(dev, data, file_priv);
1606         else
1607                 return -EINVAL;
1608 }
1609
1610 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1611 {
1612         struct drm_map_list *entry;
1613
1614         list_for_each_entry(entry, &dev->maplist, head) {
1615                 if (entry->map && entry->map->type == _DRM_SHM &&
1616                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1617                         return entry->map;
1618                 }
1619         }
1620         return NULL;
1621 }
1622 EXPORT_SYMBOL(drm_legacy_getsarea);