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/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_agpsupport.h>
  44 #include <drm/drm_device.h>
  45 #include <drm/drm_drv.h>
  46 #include <drm/drm_file.h>
  47 #include <drm/drm_print.h>
  48
  49 #include "drm_legacy.h"
  50
  51
  52 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  53                                                   struct drm_local_map *map)
  54 {
  55         struct drm_map_list *entry;
  56
  57         list_for_each_entry(entry, &dev->maplist, head) {
  58                 /*
  59                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  60                  * while PCI resources may live above that, we only compare the
  61                  * lower 32 bits of the map offset for maps of type
  62                  * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  63                  * It is assumed that if a driver have more than one resource
  64                  * of each type, the lower 32 bits are different.
  65                  */
  66                 if (!entry->map ||
  67                     map->type != entry->map->type ||
  68                     entry->master != dev->master)
  69                         continue;
  70                 switch (map->type) {
  71                 case _DRM_SHM:
  72                         if (map->flags != _DRM_CONTAINS_LOCK)
  73                                 break;
  74                         return entry;
  75                 case _DRM_REGISTERS:
  76                 case _DRM_FRAME_BUFFER:
  77                         if ((entry->map->offset & 0xffffffff) ==
  78                             (map->offset & 0xffffffff))
  79                                 return entry;
  80                         break;
  81                 default: /* Make gcc happy */
  82                         ;
  83                 }
  84                 if (entry->map->offset == map->offset)
  85                         return entry;
  86         }
  87
  88         return NULL;
  89 }
  90
  91 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  92                           unsigned long user_token, int hashed_handle, int shm)
  93 {
  94         int use_hashed_handle, shift;
  95         unsigned long add;
  96
  97 #if (BITS_PER_LONG == 64)
  98         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  99 #elif (BITS_PER_LONG == 32)
 100         use_hashed_handle = hashed_handle;
 101 #else
 102 #error Unsupported long size. Neither 64 nor 32 bits.
 103 #endif
 104
 105         if (!use_hashed_handle) {
 106                 int ret;
 107
 108                 hash->key = user_token >> PAGE_SHIFT;
 109                 ret = drm_ht_insert_item(&dev->map_hash, hash);
 110                 if (ret != -EINVAL)
 111                         return ret;
 112         }
 113
 114         shift = 0;
 115         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 116         if (shm && (SHMLBA > PAGE_SIZE)) {
 117                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 118
 119                 /* For shared memory, we have to preserve the SHMLBA
 120                  * bits of the eventual vma->vm_pgoff value during
 121                  * mmap().  Otherwise we run into cache aliasing problems
 122                  * on some platforms.  On these platforms, the pgoff of
 123                  * a mmap() request is used to pick a suitable virtual
 124                  * address for the mmap() region such that it will not
 125                  * cause cache aliasing problems.
 126                  *
 127                  * Therefore, make sure the SHMLBA relevant bits of the
 128                  * hash value we use are equal to those in the original
 129                  * kernel virtual address.
 130                  */
 131                 shift = bits;
 132                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 133         }
 134
 135         return drm_ht_just_insert_please(&dev->map_hash, hash,
 136                                          user_token, 32 - PAGE_SHIFT - 3,
 137                                          shift, add);
 138 }
 139
 140 /*
 141  * Core function to create a range of memory available for mapping by a
 142  * non-root process.
 143  *
 144  * Adjusts the memory offset to its absolute value according to the mapping
 145  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 146  * applicable and if supported by the kernel.
 147  */
 148 static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
 149                            unsigned int size, enum drm_map_type type,
 150                            enum drm_map_flags flags,
 151                            struct drm_map_list **maplist)
 152 {
 153         struct drm_local_map *map;
 154         struct drm_map_list *list;
 155         unsigned long user_token;
 156         int ret;
 157
 158         map = kmalloc(sizeof(*map), GFP_KERNEL);
 159         if (!map)
 160                 return -ENOMEM;
 161
 162         map->offset = offset;
 163         map->size = size;
 164         map->flags = flags;
 165         map->type = type;
 166
 167         /* Only allow shared memory to be removable since we only keep enough
 168          * book keeping information about shared memory to allow for removal
 169          * when processes fork.
 170          */
 171         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 172                 kfree(map);
 173                 return -EINVAL;
 174         }
 175         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 176                   (unsigned long long)map->offset, map->size, map->type);
 177
 178         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 179          * hole created by that and it works around various broken drivers that use
 180          * a non-aligned quantity to map the SAREA. --BenH
 181          */
 182         if (map->type == _DRM_SHM)
 183                 map->size = PAGE_ALIGN(map->size);
 184
 185         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 186                 kfree(map);
 187                 return -EINVAL;
 188         }
 189         map->mtrr = -1;
 190         map->handle = NULL;
 191
 192         switch (map->type) {
 193         case _DRM_REGISTERS:
 194         case _DRM_FRAME_BUFFER:
 195 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 196                 if (map->offset + (map->size-1) < map->offset ||
 197                     map->offset < virt_to_phys(high_memory)) {
 198                         kfree(map);
 199                         return -EINVAL;
 200                 }
 201 #endif
 202                 /* Some drivers preinitialize some maps, without the X Server
 203                  * needing to be aware of it.  Therefore, we just return success
 204                  * when the server tries to create a duplicate map.
 205                  */
 206                 list = drm_find_matching_map(dev, map);
 207                 if (list != NULL) {
 208                         if (list->map->size != map->size) {
 209                                 DRM_DEBUG("Matching maps of type %d with "
 210                                           "mismatched sizes, (%ld vs %ld)\n",
 211                                           map->type, map->size,
 212                                           list->map->size);
 213                                 list->map->size = map->size;
 214                         }
 215
 216                         kfree(map);
 217                         *maplist = list;
 218                         return 0;
 219                 }
 220
 221                 if (map->type == _DRM_FRAME_BUFFER ||
 222                     (map->flags & _DRM_WRITE_COMBINING)) {
 223                         map->mtrr =
 224                                 arch_phys_wc_add(map->offset, map->size);
 225                 }
 226                 if (map->type == _DRM_REGISTERS) {
 227                         if (map->flags & _DRM_WRITE_COMBINING)
 228                                 map->handle = ioremap_wc(map->offset,
 229                                                          map->size);
 230                         else
 231                                 map->handle = ioremap(map->offset, map->size);
 232                         if (!map->handle) {
 233                                 kfree(map);
 234                                 return -ENOMEM;
 235                         }
 236                 }
 237
 238                 break;
 239         case _DRM_SHM:
 240                 list = drm_find_matching_map(dev, map);
 241                 if (list != NULL) {
 242                         if (list->map->size != map->size) {
 243                                 DRM_DEBUG("Matching maps of type %d with "
 244                                           "mismatched sizes, (%ld vs %ld)\n",
 245                                           map->type, map->size, list->map->size);
 246                                 list->map->size = map->size;
 247                         }
 248
 249                         kfree(map);
 250                         *maplist = list;
 251                         return 0;
 252                 }
 253                 map->handle = vmalloc_user(map->size);
 254                 DRM_DEBUG("%lu %d %p\n",
 255                           map->size, order_base_2(map->size), map->handle);
 256                 if (!map->handle) {
 257                         kfree(map);
 258                         return -ENOMEM;
 259                 }
 260                 map->offset = (unsigned long)map->handle;
 261                 if (map->flags & _DRM_CONTAINS_LOCK) {
 262                         /* Prevent a 2nd X Server from creating a 2nd lock */
 263                         if (dev->master->lock.hw_lock != NULL) {
 264                                 vfree(map->handle);
 265                                 kfree(map);
 266                                 return -EBUSY;
 267                         }
 268                         dev->sigdata.lock = dev->master->lock.hw_lock = map->handle;    /* Pointer to lock */
 269                 }
 270                 break;
 271         case _DRM_AGP: {
 272                 struct drm_agp_mem *entry;
 273                 int valid = 0;
 274
 275                 if (!dev->agp) {
 276                         kfree(map);
 277                         return -EINVAL;
 278                 }
 279 #ifdef __alpha__
 280                 map->offset += dev->hose->mem_space->start;
 281 #endif
 282                 /* In some cases (i810 driver), user space may have already
 283                  * added the AGP base itself, because dev->agp->base previously
 284                  * only got set during AGP enable.  So, only add the base
 285                  * address if the map's offset isn't already within the
 286                  * aperture.
 287                  */
 288                 if (map->offset < dev->agp->base ||
 289                     map->offset > dev->agp->base +
 290                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 291                         map->offset += dev->agp->base;
 292                 }
 293                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 294
 295                 /* This assumes the DRM is in total control of AGP space.
 296                  * It's not always the case as AGP can be in the control
 297                  * of user space (i.e. i810 driver). So this loop will get
 298                  * skipped and we double check that dev->agp->memory is
 299                  * actually set as well as being invalid before EPERM'ing
 300                  */
 301                 list_for_each_entry(entry, &dev->agp->memory, head) {
 302                         if ((map->offset >= entry->bound) &&
 303                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 304                                 valid = 1;
 305                                 break;
 306                         }
 307                 }
 308                 if (!list_empty(&dev->agp->memory) && !valid) {
 309                         kfree(map);
 310                         return -EPERM;
 311                 }
 312                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 313                           (unsigned long long)map->offset, map->size);
 314
 315                 break;
 316         }
 317         case _DRM_SCATTER_GATHER:
 318                 if (!dev->sg) {
 319                         kfree(map);
 320                         return -EINVAL;
 321                 }
 322                 map->offset += (unsigned long)dev->sg->virtual;
 323                 break;
 324         case _DRM_CONSISTENT:
 325                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 326                  * As we're limiting the address to 2^32-1 (or less),
 327                  * casting it down to 32 bits is no problem, but we
 328                  * need to point to a 64bit variable first. */
 329                 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         int i;
 678
 679         if (entry->seg_count) {
 680                 for (i = 0; i < entry->seg_count; i++) {
 681                         if (entry->seglist[i]) {
 682                                 drm_pci_free(dev, entry->seglist[i]);
 683                         }
 684                 }
 685                 kfree(entry->seglist);
 686
 687                 entry->seg_count = 0;
 688         }
 689
 690         if (entry->buf_count) {
 691                 for (i = 0; i < entry->buf_count; i++) {
 692                         kfree(entry->buflist[i].dev_private);
 693                 }
 694                 kfree(entry->buflist);
 695
 696                 entry->buf_count = 0;
 697         }
 698 }
 699
 700 #if IS_ENABLED(CONFIG_AGP)
 701 /*
 702  * Add AGP buffers for DMA transfers.
 703  *
 704  * \param dev struct drm_device to which the buffers are to be added.
 705  * \param request pointer to a struct drm_buf_desc describing the request.
 706  * \return zero on success or a negative number on failure.
 707  *
 708  * After some sanity checks creates a drm_buf structure for each buffer and
 709  * reallocates the buffer list of the same size order to accommodate the new
 710  * buffers.
 711  */
 712 int drm_legacy_addbufs_agp(struct drm_device *dev,
 713                            struct drm_buf_desc *request)
 714 {
 715         struct drm_device_dma *dma = dev->dma;
 716         struct drm_buf_entry *entry;
 717         struct drm_agp_mem *agp_entry;
 718         struct drm_buf *buf;
 719         unsigned long offset;
 720         unsigned long agp_offset;
 721         int count;
 722         int order;
 723         int size;
 724         int alignment;
 725         int page_order;
 726         int total;
 727         int byte_count;
 728         int i, valid;
 729         struct drm_buf **temp_buflist;
 730
 731         if (!dma)
 732                 return -EINVAL;
 733
 734         count = request->count;
 735         order = order_base_2(request->size);
 736         size = 1 << order;
 737
 738         alignment = (request->flags & _DRM_PAGE_ALIGN)
 739             ? PAGE_ALIGN(size) : size;
 740         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 741         total = PAGE_SIZE << page_order;
 742
 743         byte_count = 0;
 744         agp_offset = dev->agp->base + request->agp_start;
 745
 746         DRM_DEBUG("count:      %d\n", count);
 747         DRM_DEBUG("order:      %d\n", order);
 748         DRM_DEBUG("size:       %d\n", size);
 749         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 750         DRM_DEBUG("alignment:  %d\n", alignment);
 751         DRM_DEBUG("page_order: %d\n", page_order);
 752         DRM_DEBUG("total:      %d\n", total);
 753
 754         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 755                 return -EINVAL;
 756
 757         /* Make sure buffers are located in AGP memory that we own */
 758         valid = 0;
 759         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 760                 if ((agp_offset >= agp_entry->bound) &&
 761                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 762                         valid = 1;
 763                         break;
 764                 }
 765         }
 766         if (!list_empty(&dev->agp->memory) && !valid) {
 767                 DRM_DEBUG("zone invalid\n");
 768                 return -EINVAL;
 769         }
 770         spin_lock(&dev->buf_lock);
 771         if (dev->buf_use) {
 772                 spin_unlock(&dev->buf_lock);
 773                 return -EBUSY;
 774         }
 775         atomic_inc(&dev->buf_alloc);
 776         spin_unlock(&dev->buf_lock);
 777
 778         mutex_lock(&dev->struct_mutex);
 779         entry = &dma->bufs[order];
 780         if (entry->buf_count) {
 781                 mutex_unlock(&dev->struct_mutex);
 782                 atomic_dec(&dev->buf_alloc);
 783                 return -ENOMEM; /* May only call once for each order */
 784         }
 785
 786         if (count < 0 || count > 4096) {
 787                 mutex_unlock(&dev->struct_mutex);
 788                 atomic_dec(&dev->buf_alloc);
 789                 return -EINVAL;
 790         }
 791
 792         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 793         if (!entry->buflist) {
 794                 mutex_unlock(&dev->struct_mutex);
 795                 atomic_dec(&dev->buf_alloc);
 796                 return -ENOMEM;
 797         }
 798
 799         entry->buf_size = size;
 800         entry->page_order = page_order;
 801
 802         offset = 0;
 803
 804         while (entry->buf_count < count) {
 805                 buf = &entry->buflist[entry->buf_count];
 806                 buf->idx = dma->buf_count + entry->buf_count;
 807                 buf->total = alignment;
 808                 buf->order = order;
 809                 buf->used = 0;
 810
 811                 buf->offset = (dma->byte_count + offset);
 812                 buf->bus_address = agp_offset + offset;
 813                 buf->address = (void *)(agp_offset + offset);
 814                 buf->next = NULL;
 815                 buf->waiting = 0;
 816                 buf->pending = 0;
 817                 buf->file_priv = NULL;
 818
 819                 buf->dev_priv_size = dev->driver->dev_priv_size;
 820                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 821                 if (!buf->dev_private) {
 822                         /* Set count correctly so we free the proper amount. */
 823                         entry->buf_count = count;
 824                         drm_cleanup_buf_error(dev, entry);
 825                         mutex_unlock(&dev->struct_mutex);
 826                         atomic_dec(&dev->buf_alloc);
 827                         return -ENOMEM;
 828                 }
 829
 830                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 831
 832                 offset += alignment;
 833                 entry->buf_count++;
 834                 byte_count += PAGE_SIZE << page_order;
 835         }
 836
 837         DRM_DEBUG("byte_count: %d\n", byte_count);
 838
 839         temp_buflist = krealloc(dma->buflist,
 840                                 (dma->buf_count + entry->buf_count) *
 841                                 sizeof(*dma->buflist), GFP_KERNEL);
 842         if (!temp_buflist) {
 843                 /* Free the entry because it isn't valid */
 844                 drm_cleanup_buf_error(dev, entry);
 845                 mutex_unlock(&dev->struct_mutex);
 846                 atomic_dec(&dev->buf_alloc);
 847                 return -ENOMEM;
 848         }
 849         dma->buflist = temp_buflist;
 850
 851         for (i = 0; i < entry->buf_count; i++) {
 852                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 853         }
 854
 855         dma->buf_count += entry->buf_count;
 856         dma->seg_count += entry->seg_count;
 857         dma->page_count += byte_count >> PAGE_SHIFT;
 858         dma->byte_count += byte_count;
 859
 860         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 861         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 862
 863         mutex_unlock(&dev->struct_mutex);
 864
 865         request->count = entry->buf_count;
 866         request->size = size;
 867
 868         dma->flags = _DRM_DMA_USE_AGP;
 869
 870         atomic_dec(&dev->buf_alloc);
 871         return 0;
 872 }
 873 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
 874 #endif /* CONFIG_AGP */
 875
 876 int drm_legacy_addbufs_pci(struct drm_device *dev,
 877                            struct drm_buf_desc *request)
 878 {
 879         struct drm_device_dma *dma = dev->dma;
 880         int count;
 881         int order;
 882         int size;
 883         int total;
 884         int page_order;
 885         struct drm_buf_entry *entry;
 886         drm_dma_handle_t *dmah;
 887         struct drm_buf *buf;
 888         int alignment;
 889         unsigned long offset;
 890         int i;
 891         int byte_count;
 892         int page_count;
 893         unsigned long *temp_pagelist;
 894         struct drm_buf **temp_buflist;
 895
 896         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 897                 return -EOPNOTSUPP;
 898
 899         if (!dma)
 900                 return -EINVAL;
 901
 902         if (!capable(CAP_SYS_ADMIN))
 903                 return -EPERM;
 904
 905         count = request->count;
 906         order = order_base_2(request->size);
 907         size = 1 << order;
 908
 909         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 910                   request->count, request->size, size, order);
 911
 912         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 913                 return -EINVAL;
 914
 915         alignment = (request->flags & _DRM_PAGE_ALIGN)
 916             ? PAGE_ALIGN(size) : size;
 917         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 918         total = PAGE_SIZE << page_order;
 919
 920         spin_lock(&dev->buf_lock);
 921         if (dev->buf_use) {
 922                 spin_unlock(&dev->buf_lock);
 923                 return -EBUSY;
 924         }
 925         atomic_inc(&dev->buf_alloc);
 926         spin_unlock(&dev->buf_lock);
 927
 928         mutex_lock(&dev->struct_mutex);
 929         entry = &dma->bufs[order];
 930         if (entry->buf_count) {
 931                 mutex_unlock(&dev->struct_mutex);
 932                 atomic_dec(&dev->buf_alloc);
 933                 return -ENOMEM; /* May only call once for each order */
 934         }
 935
 936         if (count < 0 || count > 4096) {
 937                 mutex_unlock(&dev->struct_mutex);
 938                 atomic_dec(&dev->buf_alloc);
 939                 return -EINVAL;
 940         }
 941
 942         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 943         if (!entry->buflist) {
 944                 mutex_unlock(&dev->struct_mutex);
 945                 atomic_dec(&dev->buf_alloc);
 946                 return -ENOMEM;
 947         }
 948
 949         entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
 950         if (!entry->seglist) {
 951                 kfree(entry->buflist);
 952                 mutex_unlock(&dev->struct_mutex);
 953                 atomic_dec(&dev->buf_alloc);
 954                 return -ENOMEM;
 955         }
 956
 957         /* Keep the original pagelist until we know all the allocations
 958          * have succeeded
 959          */
 960         temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
 961                                       sizeof(*dma->pagelist),
 962                                       GFP_KERNEL);
 963         if (!temp_pagelist) {
 964                 kfree(entry->buflist);
 965                 kfree(entry->seglist);
 966                 mutex_unlock(&dev->struct_mutex);
 967                 atomic_dec(&dev->buf_alloc);
 968                 return -ENOMEM;
 969         }
 970         memcpy(temp_pagelist,
 971                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 972         DRM_DEBUG("pagelist: %d entries\n",
 973                   dma->page_count + (count << page_order));
 974
 975         entry->buf_size = size;
 976         entry->page_order = page_order;
 977         byte_count = 0;
 978         page_count = 0;
 979
 980         while (entry->buf_count < count) {
 981
 982                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 983
 984                 if (!dmah) {
 985                         /* Set count correctly so we free the proper amount. */
 986                         entry->buf_count = count;
 987                         entry->seg_count = count;
 988                         drm_cleanup_buf_error(dev, entry);
 989                         kfree(temp_pagelist);
 990                         mutex_unlock(&dev->struct_mutex);
 991                         atomic_dec(&dev->buf_alloc);
 992                         return -ENOMEM;
 993                 }
 994                 entry->seglist[entry->seg_count++] = dmah;
 995                 for (i = 0; i < (1 << page_order); i++) {
 996                         DRM_DEBUG("page %d @ 0x%08lx\n",
 997                                   dma->page_count + page_count,
 998                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 999                         temp_pagelist[dma->page_count + page_count++]
1000                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
1001                 }
1002                 for (offset = 0;
1003                      offset + size <= total && entry->buf_count < count;
1004                      offset += alignment, ++entry->buf_count) {
1005                         buf = &entry->buflist[entry->buf_count];
1006                         buf->idx = dma->buf_count + entry->buf_count;
1007                         buf->total = alignment;
1008                         buf->order = order;
1009                         buf->used = 0;
1010                         buf->offset = (dma->byte_count + byte_count + offset);
1011                         buf->address = (void *)(dmah->vaddr + offset);
1012                         buf->bus_address = dmah->busaddr + offset;
1013                         buf->next = NULL;
1014                         buf->waiting = 0;
1015                         buf->pending = 0;
1016                         buf->file_priv = NULL;
1017
1018                         buf->dev_priv_size = dev->driver->dev_priv_size;
1019                         buf->dev_private = kzalloc(buf->dev_priv_size,
1020                                                 GFP_KERNEL);
1021                         if (!buf->dev_private) {
1022                                 /* Set count correctly so we free the proper amount. */
1023                                 entry->buf_count = count;
1024                                 entry->seg_count = count;
1025                                 drm_cleanup_buf_error(dev, entry);
1026                                 kfree(temp_pagelist);
1027                                 mutex_unlock(&dev->struct_mutex);
1028                                 atomic_dec(&dev->buf_alloc);
1029                                 return -ENOMEM;
1030                         }
1031
1032                         DRM_DEBUG("buffer %d @ %p\n",
1033                                   entry->buf_count, buf->address);
1034                 }
1035                 byte_count += PAGE_SIZE << page_order;
1036         }
1037
1038         temp_buflist = krealloc(dma->buflist,
1039                                 (dma->buf_count + entry->buf_count) *
1040                                 sizeof(*dma->buflist), GFP_KERNEL);
1041         if (!temp_buflist) {
1042                 /* Free the entry because it isn't valid */
1043                 drm_cleanup_buf_error(dev, entry);
1044                 kfree(temp_pagelist);
1045                 mutex_unlock(&dev->struct_mutex);
1046                 atomic_dec(&dev->buf_alloc);
1047                 return -ENOMEM;
1048         }
1049         dma->buflist = temp_buflist;
1050
1051         for (i = 0; i < entry->buf_count; i++) {
1052                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1053         }
1054
1055         /* No allocations failed, so now we can replace the original pagelist
1056          * with the new one.
1057          */
1058         if (dma->page_count) {
1059                 kfree(dma->pagelist);
1060         }
1061         dma->pagelist = temp_pagelist;
1062
1063         dma->buf_count += entry->buf_count;
1064         dma->seg_count += entry->seg_count;
1065         dma->page_count += entry->seg_count << page_order;
1066         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1067
1068         mutex_unlock(&dev->struct_mutex);
1069
1070         request->count = entry->buf_count;
1071         request->size = size;
1072
1073         if (request->flags & _DRM_PCI_BUFFER_RO)
1074                 dma->flags = _DRM_DMA_USE_PCI_RO;
1075
1076         atomic_dec(&dev->buf_alloc);
1077         return 0;
1078
1079 }
1080 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1081
1082 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1083                                  struct drm_buf_desc *request)
1084 {
1085         struct drm_device_dma *dma = dev->dma;
1086         struct drm_buf_entry *entry;
1087         struct drm_buf *buf;
1088         unsigned long offset;
1089         unsigned long agp_offset;
1090         int count;
1091         int order;
1092         int size;
1093         int alignment;
1094         int page_order;
1095         int total;
1096         int byte_count;
1097         int i;
1098         struct drm_buf **temp_buflist;
1099
1100         if (!drm_core_check_feature(dev, DRIVER_SG))
1101                 return -EOPNOTSUPP;
1102
1103         if (!dma)
1104                 return -EINVAL;
1105
1106         if (!capable(CAP_SYS_ADMIN))
1107                 return -EPERM;
1108
1109         count = request->count;
1110         order = order_base_2(request->size);
1111         size = 1 << order;
1112
1113         alignment = (request->flags & _DRM_PAGE_ALIGN)
1114             ? PAGE_ALIGN(size) : size;
1115         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1116         total = PAGE_SIZE << page_order;
1117
1118         byte_count = 0;
1119         agp_offset = request->agp_start;
1120
1121         DRM_DEBUG("count:      %d\n", count);
1122         DRM_DEBUG("order:      %d\n", order);
1123         DRM_DEBUG("size:       %d\n", size);
1124         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1125         DRM_DEBUG("alignment:  %d\n", alignment);
1126         DRM_DEBUG("page_order: %d\n", page_order);
1127         DRM_DEBUG("total:      %d\n", total);
1128
1129         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1130                 return -EINVAL;
1131
1132         spin_lock(&dev->buf_lock);
1133         if (dev->buf_use) {
1134                 spin_unlock(&dev->buf_lock);
1135                 return -EBUSY;
1136         }
1137         atomic_inc(&dev->buf_alloc);
1138         spin_unlock(&dev->buf_lock);
1139
1140         mutex_lock(&dev->struct_mutex);
1141         entry = &dma->bufs[order];
1142         if (entry->buf_count) {
1143                 mutex_unlock(&dev->struct_mutex);
1144                 atomic_dec(&dev->buf_alloc);
1145                 return -ENOMEM; /* May only call once for each order */
1146         }
1147
1148         if (count < 0 || count > 4096) {
1149                 mutex_unlock(&dev->struct_mutex);
1150                 atomic_dec(&dev->buf_alloc);
1151                 return -EINVAL;
1152         }
1153
1154         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1155         if (!entry->buflist) {
1156                 mutex_unlock(&dev->struct_mutex);
1157                 atomic_dec(&dev->buf_alloc);
1158                 return -ENOMEM;
1159         }
1160
1161         entry->buf_size = size;
1162         entry->page_order = page_order;
1163
1164         offset = 0;
1165
1166         while (entry->buf_count < count) {
1167                 buf = &entry->buflist[entry->buf_count];
1168                 buf->idx = dma->buf_count + entry->buf_count;
1169                 buf->total = alignment;
1170                 buf->order = order;
1171                 buf->used = 0;
1172
1173                 buf->offset = (dma->byte_count + offset);
1174                 buf->bus_address = agp_offset + offset;
1175                 buf->address = (void *)(agp_offset + offset
1176                                         + (unsigned long)dev->sg->virtual);
1177                 buf->next = NULL;
1178                 buf->waiting = 0;
1179                 buf->pending = 0;
1180                 buf->file_priv = NULL;
1181
1182                 buf->dev_priv_size = dev->driver->dev_priv_size;
1183                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1184                 if (!buf->dev_private) {
1185                         /* Set count correctly so we free the proper amount. */
1186                         entry->buf_count = count;
1187                         drm_cleanup_buf_error(dev, entry);
1188                         mutex_unlock(&dev->struct_mutex);
1189                         atomic_dec(&dev->buf_alloc);
1190                         return -ENOMEM;
1191                 }
1192
1193                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1194
1195                 offset += alignment;
1196                 entry->buf_count++;
1197                 byte_count += PAGE_SIZE << page_order;
1198         }
1199
1200         DRM_DEBUG("byte_count: %d\n", byte_count);
1201
1202         temp_buflist = krealloc(dma->buflist,
1203                                 (dma->buf_count + entry->buf_count) *
1204                                 sizeof(*dma->buflist), GFP_KERNEL);
1205         if (!temp_buflist) {
1206                 /* Free the entry because it isn't valid */
1207                 drm_cleanup_buf_error(dev, entry);
1208                 mutex_unlock(&dev->struct_mutex);
1209                 atomic_dec(&dev->buf_alloc);
1210                 return -ENOMEM;
1211         }
1212         dma->buflist = temp_buflist;
1213
1214         for (i = 0; i < entry->buf_count; i++) {
1215                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1216         }
1217
1218         dma->buf_count += entry->buf_count;
1219         dma->seg_count += entry->seg_count;
1220         dma->page_count += byte_count >> PAGE_SHIFT;
1221         dma->byte_count += byte_count;
1222
1223         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1224         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1225
1226         mutex_unlock(&dev->struct_mutex);
1227
1228         request->count = entry->buf_count;
1229         request->size = size;
1230
1231         dma->flags = _DRM_DMA_USE_SG;
1232
1233         atomic_dec(&dev->buf_alloc);
1234         return 0;
1235 }
1236
1237 /*
1238  * Add buffers for DMA transfers (ioctl).
1239  *
1240  * \param inode device inode.
1241  * \param file_priv DRM file private.
1242  * \param cmd command.
1243  * \param arg pointer to a struct drm_buf_desc request.
1244  * \return zero on success or a negative number on failure.
1245  *
1246  * According with the memory type specified in drm_buf_desc::flags and the
1247  * build options, it dispatches the call either to addbufs_agp(),
1248  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1249  * PCI memory respectively.
1250  */
1251 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1252                        struct drm_file *file_priv)
1253 {
1254         struct drm_buf_desc *request = data;
1255         int ret;
1256
1257         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1258                 return -EOPNOTSUPP;
1259
1260         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1261                 return -EOPNOTSUPP;
1262
1263 #if IS_ENABLED(CONFIG_AGP)
1264         if (request->flags & _DRM_AGP_BUFFER)
1265                 ret = drm_legacy_addbufs_agp(dev, request);
1266         else
1267 #endif
1268         if (request->flags & _DRM_SG_BUFFER)
1269                 ret = drm_legacy_addbufs_sg(dev, request);
1270         else if (request->flags & _DRM_FB_BUFFER)
1271                 ret = -EINVAL;
1272         else
1273                 ret = drm_legacy_addbufs_pci(dev, request);
1274
1275         return ret;
1276 }
1277
1278 /*
1279  * Get information about the buffer mappings.
1280  *
1281  * This was originally mean for debugging purposes, or by a sophisticated
1282  * client library to determine how best to use the available buffers (e.g.,
1283  * large buffers can be used for image transfer).
1284  *
1285  * \param inode device inode.
1286  * \param file_priv DRM file private.
1287  * \param cmd command.
1288  * \param arg pointer to a drm_buf_info structure.
1289  * \return zero on success or a negative number on failure.
1290  *
1291  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1292  * lock, preventing of allocating more buffers after this call. Information
1293  * about each requested buffer is then copied into user space.
1294  */
1295 int __drm_legacy_infobufs(struct drm_device *dev,
1296                         void *data, int *p,
1297                         int (*f)(void *, int, struct drm_buf_entry *))
1298 {
1299         struct drm_device_dma *dma = dev->dma;
1300         int i;
1301         int count;
1302
1303         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1304                 return -EOPNOTSUPP;
1305
1306         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1307                 return -EOPNOTSUPP;
1308
1309         if (!dma)
1310                 return -EINVAL;
1311
1312         spin_lock(&dev->buf_lock);
1313         if (atomic_read(&dev->buf_alloc)) {
1314                 spin_unlock(&dev->buf_lock);
1315                 return -EBUSY;
1316         }
1317         ++dev->buf_use;         /* Can't allocate more after this call */
1318         spin_unlock(&dev->buf_lock);
1319
1320         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1321                 if (dma->bufs[i].buf_count)
1322                         ++count;
1323         }
1324
1325         DRM_DEBUG("count = %d\n", count);
1326
1327         if (*p >= count) {
1328                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1329                         struct drm_buf_entry *from = &dma->bufs[i];
1330
1331                         if (from->buf_count) {
1332                                 if (f(data, count, from) < 0)
1333                                         return -EFAULT;
1334                                 DRM_DEBUG("%d %d %d %d %d\n",
1335                                           i,
1336                                           dma->bufs[i].buf_count,
1337                                           dma->bufs[i].buf_size,
1338                                           dma->bufs[i].low_mark,
1339                                           dma->bufs[i].high_mark);
1340                                 ++count;
1341                         }
1342                 }
1343         }
1344         *p = count;
1345
1346         return 0;
1347 }
1348
1349 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1350 {
1351         struct drm_buf_info *request = data;
1352         struct drm_buf_desc __user *to = &request->list[count];
1353         struct drm_buf_desc v = {.count = from->buf_count,
1354                                  .size = from->buf_size,
1355                                  .low_mark = from->low_mark,
1356                                  .high_mark = from->high_mark};
1357
1358         if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1359                 return -EFAULT;
1360         return 0;
1361 }
1362
1363 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1364                         struct drm_file *file_priv)
1365 {
1366         struct drm_buf_info *request = data;
1367
1368         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1369 }
1370
1371 /*
1372  * Specifies a low and high water mark for buffer allocation
1373  *
1374  * \param inode device inode.
1375  * \param file_priv DRM file private.
1376  * \param cmd command.
1377  * \param arg a pointer to a drm_buf_desc structure.
1378  * \return zero on success or a negative number on failure.
1379  *
1380  * Verifies that the size order is bounded between the admissible orders and
1381  * updates the respective drm_device_dma::bufs entry low and high water mark.
1382  *
1383  * \note This ioctl is deprecated and mostly never used.
1384  */
1385 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1386                         struct drm_file *file_priv)
1387 {
1388         struct drm_device_dma *dma = dev->dma;
1389         struct drm_buf_desc *request = data;
1390         int order;
1391         struct drm_buf_entry *entry;
1392
1393         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1394                 return -EOPNOTSUPP;
1395
1396         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1397                 return -EOPNOTSUPP;
1398
1399         if (!dma)
1400                 return -EINVAL;
1401
1402         DRM_DEBUG("%d, %d, %d\n",
1403                   request->size, request->low_mark, request->high_mark);
1404         order = order_base_2(request->size);
1405         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1406                 return -EINVAL;
1407         entry = &dma->bufs[order];
1408
1409         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1410                 return -EINVAL;
1411         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1412                 return -EINVAL;
1413
1414         entry->low_mark = request->low_mark;
1415         entry->high_mark = request->high_mark;
1416
1417         return 0;
1418 }
1419
1420 /*
1421  * Unreserve the buffers in list, previously reserved using drmDMA.
1422  *
1423  * \param inode device inode.
1424  * \param file_priv DRM file private.
1425  * \param cmd command.
1426  * \param arg pointer to a drm_buf_free structure.
1427  * \return zero on success or a negative number on failure.
1428  *
1429  * Calls free_buffer() for each used buffer.
1430  * This function is primarily used for debugging.
1431  */
1432 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1433                         struct drm_file *file_priv)
1434 {
1435         struct drm_device_dma *dma = dev->dma;
1436         struct drm_buf_free *request = data;
1437         int i;
1438         int idx;
1439         struct drm_buf *buf;
1440
1441         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1442                 return -EOPNOTSUPP;
1443
1444         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1445                 return -EOPNOTSUPP;
1446
1447         if (!dma)
1448                 return -EINVAL;
1449
1450         DRM_DEBUG("%d\n", request->count);
1451         for (i = 0; i < request->count; i++) {
1452                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1453                         return -EFAULT;
1454                 if (idx < 0 || idx >= dma->buf_count) {
1455                         DRM_ERROR("Index %d (of %d max)\n",
1456                                   idx, dma->buf_count - 1);
1457                         return -EINVAL;
1458                 }
1459                 idx = array_index_nospec(idx, dma->buf_count);
1460                 buf = dma->buflist[idx];
1461                 if (buf->file_priv != file_priv) {
1462                         DRM_ERROR("Process %d freeing buffer not owned\n",
1463                                   task_pid_nr(current));
1464                         return -EINVAL;
1465                 }
1466                 drm_legacy_free_buffer(dev, buf);
1467         }
1468
1469         return 0;
1470 }
1471
1472 /*
1473  * Maps all of the DMA buffers into client-virtual space (ioctl).
1474  *
1475  * \param inode device inode.
1476  * \param file_priv DRM file private.
1477  * \param cmd command.
1478  * \param arg pointer to a drm_buf_map structure.
1479  * \return zero on success or a negative number on failure.
1480  *
1481  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1482  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1483  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1484  * drm_mmap_dma().
1485  */
1486 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1487                          void __user **v,
1488                          int (*f)(void *, int, unsigned long,
1489                                  struct drm_buf *),
1490                                  struct drm_file *file_priv)
1491 {
1492         struct drm_device_dma *dma = dev->dma;
1493         int retcode = 0;
1494         unsigned long virtual;
1495         int i;
1496
1497         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1498                 return -EOPNOTSUPP;
1499
1500         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1501                 return -EOPNOTSUPP;
1502
1503         if (!dma)
1504                 return -EINVAL;
1505
1506         spin_lock(&dev->buf_lock);
1507         if (atomic_read(&dev->buf_alloc)) {
1508                 spin_unlock(&dev->buf_lock);
1509                 return -EBUSY;
1510         }
1511         dev->buf_use++;         /* Can't allocate more after this call */
1512         spin_unlock(&dev->buf_lock);
1513
1514         if (*p >= dma->buf_count) {
1515                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1516                     || (drm_core_check_feature(dev, DRIVER_SG)
1517                         && (dma->flags & _DRM_DMA_USE_SG))) {
1518                         struct drm_local_map *map = dev->agp_buffer_map;
1519                         unsigned long token = dev->agp_buffer_token;
1520
1521                         if (!map) {
1522                                 retcode = -EINVAL;
1523                                 goto done;
1524                         }
1525                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1526                                           PROT_READ | PROT_WRITE,
1527                                           MAP_SHARED,
1528                                           token);
1529                 } else {
1530                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1531                                           PROT_READ | PROT_WRITE,
1532                                           MAP_SHARED, 0);
1533                 }
1534                 if (virtual > -1024UL) {
1535                         /* Real error */
1536                         retcode = (signed long)virtual;
1537                         goto done;
1538                 }
1539                 *v = (void __user *)virtual;
1540
1541                 for (i = 0; i < dma->buf_count; i++) {
1542                         if (f(data, i, virtual, dma->buflist[i]) < 0) {
1543                                 retcode = -EFAULT;
1544                                 goto done;
1545                         }
1546                 }
1547         }
1548       done:
1549         *p = dma->buf_count;
1550         DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1551
1552         return retcode;
1553 }
1554
1555 static int map_one_buf(void *data, int idx, unsigned long virtual,
1556                         struct drm_buf *buf)
1557 {
1558         struct drm_buf_map *request = data;
1559         unsigned long address = virtual + buf->offset;  /* *** */
1560
1561         if (copy_to_user(&request->list[idx].idx, &buf->idx,
1562                          sizeof(request->list[0].idx)))
1563                 return -EFAULT;
1564         if (copy_to_user(&request->list[idx].total, &buf->total,
1565                          sizeof(request->list[0].total)))
1566                 return -EFAULT;
1567         if (clear_user(&request->list[idx].used, sizeof(int)))
1568                 return -EFAULT;
1569         if (copy_to_user(&request->list[idx].address, &address,
1570                          sizeof(address)))
1571                 return -EFAULT;
1572         return 0;
1573 }
1574
1575 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1576                        struct drm_file *file_priv)
1577 {
1578         struct drm_buf_map *request = data;
1579
1580         return __drm_legacy_mapbufs(dev, data, &request->count,
1581                                     &request->virtual, map_one_buf,
1582                                     file_priv);
1583 }
1584
1585 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1586                   struct drm_file *file_priv)
1587 {
1588         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1589                 return -EOPNOTSUPP;
1590
1591         if (dev->driver->dma_ioctl)
1592                 return dev->driver->dma_ioctl(dev, data, file_priv);
1593         else
1594                 return -EINVAL;
1595 }
1596
1597 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1598 {
1599         struct drm_map_list *entry;
1600
1601         list_for_each_entry(entry, &dev->maplist, head) {
1602                 if (entry->map && entry->map->type == _DRM_SHM &&
1603                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1604                         return entry->map;
1605                 }
1606         }
1607         return NULL;
1608 }
1609 EXPORT_SYMBOL(drm_legacy_getsarea);