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_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                 default: /* Make gcc happy */
  81                         ;
  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                 map->handle = dma_alloc_coherent(&dev->pdev->dev,
 329                                                  map->size,
 330                                                  &map->offset,
 331                                                  GFP_KERNEL);
 332                 if (!map->handle) {
 333                         kfree(map);
 334                         return -ENOMEM;
 335                 }
 336                 break;
 337         default:
 338                 kfree(map);
 339                 return -EINVAL;
 340         }
 341
 342         list = kzalloc(sizeof(*list), GFP_KERNEL);
 343         if (!list) {
 344                 if (map->type == _DRM_REGISTERS)
 345                         iounmap(map->handle);
 346                 kfree(map);
 347                 return -EINVAL;
 348         }
 349         list->map = map;
 350
 351         mutex_lock(&dev->struct_mutex);
 352         list_add(&list->head, &dev->maplist);
 353
 354         /* Assign a 32-bit handle */
 355         /* We do it here so that dev->struct_mutex protects the increment */
 356         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 357                 map->offset;
 358         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 359                              (map->type == _DRM_SHM));
 360         if (ret) {
 361                 if (map->type == _DRM_REGISTERS)
 362                         iounmap(map->handle);
 363                 kfree(map);
 364                 kfree(list);
 365                 mutex_unlock(&dev->struct_mutex);
 366                 return ret;
 367         }
 368
 369         list->user_token = list->hash.key << PAGE_SHIFT;
 370         mutex_unlock(&dev->struct_mutex);
 371
 372         if (!(map->flags & _DRM_DRIVER))
 373                 list->master = dev->master;
 374         *maplist = list;
 375         return 0;
 376 }
 377
 378 int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
 379                       unsigned int size, enum drm_map_type type,
 380                       enum drm_map_flags flags, struct drm_local_map **map_ptr)
 381 {
 382         struct drm_map_list *list;
 383         int rc;
 384
 385         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 386         if (!rc)
 387                 *map_ptr = list->map;
 388         return rc;
 389 }
 390 EXPORT_SYMBOL(drm_legacy_addmap);
 391
 392 struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
 393                                          unsigned int token)
 394 {
 395         struct drm_map_list *_entry;
 396
 397         list_for_each_entry(_entry, &dev->maplist, head)
 398                 if (_entry->user_token == token)
 399                         return _entry->map;
 400         return NULL;
 401 }
 402 EXPORT_SYMBOL(drm_legacy_findmap);
 403
 404 /*
 405  * Ioctl to specify a range of memory that is available for mapping by a
 406  * non-root process.
 407  *
 408  * \param inode device inode.
 409  * \param file_priv DRM file private.
 410  * \param cmd command.
 411  * \param arg pointer to a drm_map structure.
 412  * \return zero on success or a negative value on error.
 413  *
 414  */
 415 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
 416                             struct drm_file *file_priv)
 417 {
 418         struct drm_map *map = data;
 419         struct drm_map_list *maplist;
 420         int err;
 421
 422         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 423                 return -EPERM;
 424
 425         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 426             !drm_core_check_feature(dev, DRIVER_LEGACY))
 427                 return -EOPNOTSUPP;
 428
 429         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 430                               map->flags, &maplist);
 431
 432         if (err)
 433                 return err;
 434
 435         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 436         map->handle = (void *)(unsigned long)maplist->user_token;
 437
 438         /*
 439          * It appears that there are no users of this value whatsoever --
 440          * drmAddMap just discards it.  Let's not encourage its use.
 441          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 442          *  it's not a real mtrr index anymore.)
 443          */
 444         map->mtrr = -1;
 445
 446         return 0;
 447 }
 448
 449 /*
 450  * Get a mapping information.
 451  *
 452  * \param inode device inode.
 453  * \param file_priv DRM file private.
 454  * \param cmd command.
 455  * \param arg user argument, pointing to a drm_map structure.
 456  *
 457  * \return zero on success or a negative number on failure.
 458  *
 459  * Searches for the mapping with the specified offset and copies its information
 460  * into userspace
 461  */
 462 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
 463                             struct drm_file *file_priv)
 464 {
 465         struct drm_map *map = data;
 466         struct drm_map_list *r_list = NULL;
 467         struct list_head *list;
 468         int idx;
 469         int i;
 470
 471         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 472             !drm_core_check_feature(dev, DRIVER_LEGACY))
 473                 return -EOPNOTSUPP;
 474
 475         idx = map->offset;
 476         if (idx < 0)
 477                 return -EINVAL;
 478
 479         i = 0;
 480         mutex_lock(&dev->struct_mutex);
 481         list_for_each(list, &dev->maplist) {
 482                 if (i == idx) {
 483                         r_list = list_entry(list, struct drm_map_list, head);
 484                         break;
 485                 }
 486                 i++;
 487         }
 488         if (!r_list || !r_list->map) {
 489                 mutex_unlock(&dev->struct_mutex);
 490                 return -EINVAL;
 491         }
 492
 493         map->offset = r_list->map->offset;
 494         map->size = r_list->map->size;
 495         map->type = r_list->map->type;
 496         map->flags = r_list->map->flags;
 497         map->handle = (void *)(unsigned long) r_list->user_token;
 498         map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
 499
 500         mutex_unlock(&dev->struct_mutex);
 501
 502         return 0;
 503 }
 504
 505 /*
 506  * Remove a map private from list and deallocate resources if the mapping
 507  * isn't in use.
 508  *
 509  * Searches the map on drm_device::maplist, removes it from the list, see if
 510  * it's being used, and free any associated resource (such as MTRR's) if it's not
 511  * being on use.
 512  *
 513  * \sa drm_legacy_addmap
 514  */
 515 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 516 {
 517         struct drm_map_list *r_list = NULL, *list_t;
 518         int found = 0;
 519         struct drm_master *master;
 520
 521         /* Find the list entry for the map and remove it */
 522         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 523                 if (r_list->map == map) {
 524                         master = r_list->master;
 525                         list_del(&r_list->head);
 526                         drm_ht_remove_key(&dev->map_hash,
 527                                           r_list->user_token >> PAGE_SHIFT);
 528                         kfree(r_list);
 529                         found = 1;
 530                         break;
 531                 }
 532         }
 533
 534         if (!found)
 535                 return -EINVAL;
 536
 537         switch (map->type) {
 538         case _DRM_REGISTERS:
 539                 iounmap(map->handle);
 540                 fallthrough;
 541         case _DRM_FRAME_BUFFER:
 542                 arch_phys_wc_del(map->mtrr);
 543                 break;
 544         case _DRM_SHM:
 545                 vfree(map->handle);
 546                 if (master) {
 547                         if (dev->sigdata.lock == master->lock.hw_lock)
 548                                 dev->sigdata.lock = NULL;
 549                         master->lock.hw_lock = NULL;   /* SHM removed */
 550                         master->lock.file_priv = NULL;
 551                         wake_up_interruptible_all(&master->lock.lock_queue);
 552                 }
 553                 break;
 554         case _DRM_AGP:
 555         case _DRM_SCATTER_GATHER:
 556                 break;
 557         case _DRM_CONSISTENT:
 558                 dma_free_coherent(&dev->pdev->dev,
 559                                   map->size,
 560                                   map->handle,
 561                                   map->offset);
 562                 break;
 563         }
 564         kfree(map);
 565
 566         return 0;
 567 }
 568 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
 569
 570 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
 571 {
 572         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 573             !drm_core_check_feature(dev, DRIVER_LEGACY))
 574                 return;
 575
 576         mutex_lock(&dev->struct_mutex);
 577         drm_legacy_rmmap_locked(dev, map);
 578         mutex_unlock(&dev->struct_mutex);
 579 }
 580 EXPORT_SYMBOL(drm_legacy_rmmap);
 581
 582 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
 583 {
 584         struct drm_map_list *r_list, *list_temp;
 585
 586         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 587                 return;
 588
 589         mutex_lock(&dev->struct_mutex);
 590         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 591                 if (r_list->master == master) {
 592                         drm_legacy_rmmap_locked(dev, r_list->map);
 593                         r_list = NULL;
 594                 }
 595         }
 596         mutex_unlock(&dev->struct_mutex);
 597 }
 598
 599 void drm_legacy_rmmaps(struct drm_device *dev)
 600 {
 601         struct drm_map_list *r_list, *list_temp;
 602
 603         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
 604                 drm_legacy_rmmap(dev, r_list->map);
 605 }
 606
 607 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 608  * the last close of the device, and this is necessary for cleanup when things
 609  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 610  * like a pointless exercise since they're going away anyway.
 611  *
 612  * One use case might be after addmap is allowed for normal users for SHM and
 613  * gets used by drivers that the server doesn't need to care about.  This seems
 614  * unlikely.
 615  *
 616  * \param inode device inode.
 617  * \param file_priv DRM file private.
 618  * \param cmd command.
 619  * \param arg pointer to a struct drm_map structure.
 620  * \return zero on success or a negative value on error.
 621  */
 622 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
 623                            struct drm_file *file_priv)
 624 {
 625         struct drm_map *request = data;
 626         struct drm_local_map *map = NULL;
 627         struct drm_map_list *r_list;
 628         int ret;
 629
 630         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 631             !drm_core_check_feature(dev, DRIVER_LEGACY))
 632                 return -EOPNOTSUPP;
 633
 634         mutex_lock(&dev->struct_mutex);
 635         list_for_each_entry(r_list, &dev->maplist, head) {
 636                 if (r_list->map &&
 637                     r_list->user_token == (unsigned long)request->handle &&
 638                     r_list->map->flags & _DRM_REMOVABLE) {
 639                         map = r_list->map;
 640                         break;
 641                 }
 642         }
 643
 644         /* List has wrapped around to the head pointer, or it's empty we didn't
 645          * find anything.
 646          */
 647         if (list_empty(&dev->maplist) || !map) {
 648                 mutex_unlock(&dev->struct_mutex);
 649                 return -EINVAL;
 650         }
 651
 652         /* Register and framebuffer maps are permanent */
 653         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 654                 mutex_unlock(&dev->struct_mutex);
 655                 return 0;
 656         }
 657
 658         ret = drm_legacy_rmmap_locked(dev, map);
 659
 660         mutex_unlock(&dev->struct_mutex);
 661
 662         return ret;
 663 }
 664
 665 /*
 666  * Cleanup after an error on one of the addbufs() functions.
 667  *
 668  * \param dev DRM device.
 669  * \param entry buffer entry where the error occurred.
 670  *
 671  * Frees any pages and buffers associated with the given entry.
 672  */
 673 static void drm_cleanup_buf_error(struct drm_device *dev,
 674                                   struct drm_buf_entry *entry)
 675 {
 676         int i;
 677
 678         if (entry->seg_count) {
 679                 for (i = 0; i < entry->seg_count; i++) {
 680                         if (entry->seglist[i]) {
 681                                 drm_pci_free(dev, entry->seglist[i]);
 682                         }
 683                 }
 684                 kfree(entry->seglist);
 685
 686                 entry->seg_count = 0;
 687         }
 688
 689         if (entry->buf_count) {
 690                 for (i = 0; i < entry->buf_count; i++) {
 691                         kfree(entry->buflist[i].dev_private);
 692                 }
 693                 kfree(entry->buflist);
 694
 695                 entry->buf_count = 0;
 696         }
 697 }
 698
 699 #if IS_ENABLED(CONFIG_AGP)
 700 /*
 701  * Add AGP buffers for DMA transfers.
 702  *
 703  * \param dev struct drm_device to which the buffers are to be added.
 704  * \param request pointer to a struct drm_buf_desc describing the request.
 705  * \return zero on success or a negative number on failure.
 706  *
 707  * After some sanity checks creates a drm_buf structure for each buffer and
 708  * reallocates the buffer list of the same size order to accommodate the new
 709  * buffers.
 710  */
 711 int drm_legacy_addbufs_agp(struct drm_device *dev,
 712                            struct drm_buf_desc *request)
 713 {
 714         struct drm_device_dma *dma = dev->dma;
 715         struct drm_buf_entry *entry;
 716         struct drm_agp_mem *agp_entry;
 717         struct drm_buf *buf;
 718         unsigned long offset;
 719         unsigned long agp_offset;
 720         int count;
 721         int order;
 722         int size;
 723         int alignment;
 724         int page_order;
 725         int total;
 726         int byte_count;
 727         int i, valid;
 728         struct drm_buf **temp_buflist;
 729
 730         if (!dma)
 731                 return -EINVAL;
 732
 733         count = request->count;
 734         order = order_base_2(request->size);
 735         size = 1 << order;
 736
 737         alignment = (request->flags & _DRM_PAGE_ALIGN)
 738             ? PAGE_ALIGN(size) : size;
 739         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 740         total = PAGE_SIZE << page_order;
 741
 742         byte_count = 0;
 743         agp_offset = dev->agp->base + request->agp_start;
 744
 745         DRM_DEBUG("count:      %d\n", count);
 746         DRM_DEBUG("order:      %d\n", order);
 747         DRM_DEBUG("size:       %d\n", size);
 748         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 749         DRM_DEBUG("alignment:  %d\n", alignment);
 750         DRM_DEBUG("page_order: %d\n", page_order);
 751         DRM_DEBUG("total:      %d\n", total);
 752
 753         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 754                 return -EINVAL;
 755
 756         /* Make sure buffers are located in AGP memory that we own */
 757         valid = 0;
 758         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 759                 if ((agp_offset >= agp_entry->bound) &&
 760                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 761                         valid = 1;
 762                         break;
 763                 }
 764         }
 765         if (!list_empty(&dev->agp->memory) && !valid) {
 766                 DRM_DEBUG("zone invalid\n");
 767                 return -EINVAL;
 768         }
 769         spin_lock(&dev->buf_lock);
 770         if (dev->buf_use) {
 771                 spin_unlock(&dev->buf_lock);
 772                 return -EBUSY;
 773         }
 774         atomic_inc(&dev->buf_alloc);
 775         spin_unlock(&dev->buf_lock);
 776
 777         mutex_lock(&dev->struct_mutex);
 778         entry = &dma->bufs[order];
 779         if (entry->buf_count) {
 780                 mutex_unlock(&dev->struct_mutex);
 781                 atomic_dec(&dev->buf_alloc);
 782                 return -ENOMEM; /* May only call once for each order */
 783         }
 784
 785         if (count < 0 || count > 4096) {
 786                 mutex_unlock(&dev->struct_mutex);
 787                 atomic_dec(&dev->buf_alloc);
 788                 return -EINVAL;
 789         }
 790
 791         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 792         if (!entry->buflist) {
 793                 mutex_unlock(&dev->struct_mutex);
 794                 atomic_dec(&dev->buf_alloc);
 795                 return -ENOMEM;
 796         }
 797
 798         entry->buf_size = size;
 799         entry->page_order = page_order;
 800
 801         offset = 0;
 802
 803         while (entry->buf_count < count) {
 804                 buf = &entry->buflist[entry->buf_count];
 805                 buf->idx = dma->buf_count + entry->buf_count;
 806                 buf->total = alignment;
 807                 buf->order = order;
 808                 buf->used = 0;
 809
 810                 buf->offset = (dma->byte_count + offset);
 811                 buf->bus_address = agp_offset + offset;
 812                 buf->address = (void *)(agp_offset + offset);
 813                 buf->next = NULL;
 814                 buf->waiting = 0;
 815                 buf->pending = 0;
 816                 buf->file_priv = NULL;
 817
 818                 buf->dev_priv_size = dev->driver->dev_priv_size;
 819                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 820                 if (!buf->dev_private) {
 821                         /* Set count correctly so we free the proper amount. */
 822                         entry->buf_count = count;
 823                         drm_cleanup_buf_error(dev, entry);
 824                         mutex_unlock(&dev->struct_mutex);
 825                         atomic_dec(&dev->buf_alloc);
 826                         return -ENOMEM;
 827                 }
 828
 829                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 830
 831                 offset += alignment;
 832                 entry->buf_count++;
 833                 byte_count += PAGE_SIZE << page_order;
 834         }
 835
 836         DRM_DEBUG("byte_count: %d\n", byte_count);
 837
 838         temp_buflist = krealloc(dma->buflist,
 839                                 (dma->buf_count + entry->buf_count) *
 840                                 sizeof(*dma->buflist), GFP_KERNEL);
 841         if (!temp_buflist) {
 842                 /* Free the entry because it isn't valid */
 843                 drm_cleanup_buf_error(dev, entry);
 844                 mutex_unlock(&dev->struct_mutex);
 845                 atomic_dec(&dev->buf_alloc);
 846                 return -ENOMEM;
 847         }
 848         dma->buflist = temp_buflist;
 849
 850         for (i = 0; i < entry->buf_count; i++) {
 851                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 852         }
 853
 854         dma->buf_count += entry->buf_count;
 855         dma->seg_count += entry->seg_count;
 856         dma->page_count += byte_count >> PAGE_SHIFT;
 857         dma->byte_count += byte_count;
 858
 859         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 860         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 861
 862         mutex_unlock(&dev->struct_mutex);
 863
 864         request->count = entry->buf_count;
 865         request->size = size;
 866
 867         dma->flags = _DRM_DMA_USE_AGP;
 868
 869         atomic_dec(&dev->buf_alloc);
 870         return 0;
 871 }
 872 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
 873 #endif /* CONFIG_AGP */
 874
 875 int drm_legacy_addbufs_pci(struct drm_device *dev,
 876                            struct drm_buf_desc *request)
 877 {
 878         struct drm_device_dma *dma = dev->dma;
 879         int count;
 880         int order;
 881         int size;
 882         int total;
 883         int page_order;
 884         struct drm_buf_entry *entry;
 885         drm_dma_handle_t *dmah;
 886         struct drm_buf *buf;
 887         int alignment;
 888         unsigned long offset;
 889         int i;
 890         int byte_count;
 891         int page_count;
 892         unsigned long *temp_pagelist;
 893         struct drm_buf **temp_buflist;
 894
 895         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 896                 return -EOPNOTSUPP;
 897
 898         if (!dma)
 899                 return -EINVAL;
 900
 901         if (!capable(CAP_SYS_ADMIN))
 902                 return -EPERM;
 903
 904         count = request->count;
 905         order = order_base_2(request->size);
 906         size = 1 << order;
 907
 908         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 909                   request->count, request->size, size, order);
 910
 911         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 912                 return -EINVAL;
 913
 914         alignment = (request->flags & _DRM_PAGE_ALIGN)
 915             ? PAGE_ALIGN(size) : size;
 916         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 917         total = PAGE_SIZE << page_order;
 918
 919         spin_lock(&dev->buf_lock);
 920         if (dev->buf_use) {
 921                 spin_unlock(&dev->buf_lock);
 922                 return -EBUSY;
 923         }
 924         atomic_inc(&dev->buf_alloc);
 925         spin_unlock(&dev->buf_lock);
 926
 927         mutex_lock(&dev->struct_mutex);
 928         entry = &dma->bufs[order];
 929         if (entry->buf_count) {
 930                 mutex_unlock(&dev->struct_mutex);
 931                 atomic_dec(&dev->buf_alloc);
 932                 return -ENOMEM; /* May only call once for each order */
 933         }
 934
 935         if (count < 0 || count > 4096) {
 936                 mutex_unlock(&dev->struct_mutex);
 937                 atomic_dec(&dev->buf_alloc);
 938                 return -EINVAL;
 939         }
 940
 941         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 942         if (!entry->buflist) {
 943                 mutex_unlock(&dev->struct_mutex);
 944                 atomic_dec(&dev->buf_alloc);
 945                 return -ENOMEM;
 946         }
 947
 948         entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
 949         if (!entry->seglist) {
 950                 kfree(entry->buflist);
 951                 mutex_unlock(&dev->struct_mutex);
 952                 atomic_dec(&dev->buf_alloc);
 953                 return -ENOMEM;
 954         }
 955
 956         /* Keep the original pagelist until we know all the allocations
 957          * have succeeded
 958          */
 959         temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
 960                                       sizeof(*dma->pagelist),
 961                                       GFP_KERNEL);
 962         if (!temp_pagelist) {
 963                 kfree(entry->buflist);
 964                 kfree(entry->seglist);
 965                 mutex_unlock(&dev->struct_mutex);
 966                 atomic_dec(&dev->buf_alloc);
 967                 return -ENOMEM;
 968         }
 969         memcpy(temp_pagelist,
 970                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 971         DRM_DEBUG("pagelist: %d entries\n",
 972                   dma->page_count + (count << page_order));
 973
 974         entry->buf_size = size;
 975         entry->page_order = page_order;
 976         byte_count = 0;
 977         page_count = 0;
 978
 979         while (entry->buf_count < count) {
 980
 981                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 982
 983                 if (!dmah) {
 984                         /* Set count correctly so we free the proper amount. */
 985                         entry->buf_count = count;
 986                         entry->seg_count = count;
 987                         drm_cleanup_buf_error(dev, entry);
 988                         kfree(temp_pagelist);
 989                         mutex_unlock(&dev->struct_mutex);
 990                         atomic_dec(&dev->buf_alloc);
 991                         return -ENOMEM;
 992                 }
 993                 entry->seglist[entry->seg_count++] = dmah;
 994                 for (i = 0; i < (1 << page_order); i++) {
 995                         DRM_DEBUG("page %d @ 0x%08lx\n",
 996                                   dma->page_count + page_count,
 997                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 998                         temp_pagelist[dma->page_count + page_count++]
 999                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
1000                 }
1001                 for (offset = 0;
1002                      offset + size <= total && entry->buf_count < count;
1003                      offset += alignment, ++entry->buf_count) {
1004                         buf = &entry->buflist[entry->buf_count];
1005                         buf->idx = dma->buf_count + entry->buf_count;
1006                         buf->total = alignment;
1007                         buf->order = order;
1008                         buf->used = 0;
1009                         buf->offset = (dma->byte_count + byte_count + offset);
1010                         buf->address = (void *)(dmah->vaddr + offset);
1011                         buf->bus_address = dmah->busaddr + offset;
1012                         buf->next = NULL;
1013                         buf->waiting = 0;
1014                         buf->pending = 0;
1015                         buf->file_priv = NULL;
1016
1017                         buf->dev_priv_size = dev->driver->dev_priv_size;
1018                         buf->dev_private = kzalloc(buf->dev_priv_size,
1019                                                 GFP_KERNEL);
1020                         if (!buf->dev_private) {
1021                                 /* Set count correctly so we free the proper amount. */
1022                                 entry->buf_count = count;
1023                                 entry->seg_count = count;
1024                                 drm_cleanup_buf_error(dev, entry);
1025                                 kfree(temp_pagelist);
1026                                 mutex_unlock(&dev->struct_mutex);
1027                                 atomic_dec(&dev->buf_alloc);
1028                                 return -ENOMEM;
1029                         }
1030
1031                         DRM_DEBUG("buffer %d @ %p\n",
1032                                   entry->buf_count, buf->address);
1033                 }
1034                 byte_count += PAGE_SIZE << page_order;
1035         }
1036
1037         temp_buflist = krealloc(dma->buflist,
1038                                 (dma->buf_count + entry->buf_count) *
1039                                 sizeof(*dma->buflist), GFP_KERNEL);
1040         if (!temp_buflist) {
1041                 /* Free the entry because it isn't valid */
1042                 drm_cleanup_buf_error(dev, entry);
1043                 kfree(temp_pagelist);
1044                 mutex_unlock(&dev->struct_mutex);
1045                 atomic_dec(&dev->buf_alloc);
1046                 return -ENOMEM;
1047         }
1048         dma->buflist = temp_buflist;
1049
1050         for (i = 0; i < entry->buf_count; i++) {
1051                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1052         }
1053
1054         /* No allocations failed, so now we can replace the original pagelist
1055          * with the new one.
1056          */
1057         if (dma->page_count) {
1058                 kfree(dma->pagelist);
1059         }
1060         dma->pagelist = temp_pagelist;
1061
1062         dma->buf_count += entry->buf_count;
1063         dma->seg_count += entry->seg_count;
1064         dma->page_count += entry->seg_count << page_order;
1065         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1066
1067         mutex_unlock(&dev->struct_mutex);
1068
1069         request->count = entry->buf_count;
1070         request->size = size;
1071
1072         if (request->flags & _DRM_PCI_BUFFER_RO)
1073                 dma->flags = _DRM_DMA_USE_PCI_RO;
1074
1075         atomic_dec(&dev->buf_alloc);
1076         return 0;
1077
1078 }
1079 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1080
1081 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1082                                  struct drm_buf_desc *request)
1083 {
1084         struct drm_device_dma *dma = dev->dma;
1085         struct drm_buf_entry *entry;
1086         struct drm_buf *buf;
1087         unsigned long offset;
1088         unsigned long agp_offset;
1089         int count;
1090         int order;
1091         int size;
1092         int alignment;
1093         int page_order;
1094         int total;
1095         int byte_count;
1096         int i;
1097         struct drm_buf **temp_buflist;
1098
1099         if (!drm_core_check_feature(dev, DRIVER_SG))
1100                 return -EOPNOTSUPP;
1101
1102         if (!dma)
1103                 return -EINVAL;
1104
1105         if (!capable(CAP_SYS_ADMIN))
1106                 return -EPERM;
1107
1108         count = request->count;
1109         order = order_base_2(request->size);
1110         size = 1 << order;
1111
1112         alignment = (request->flags & _DRM_PAGE_ALIGN)
1113             ? PAGE_ALIGN(size) : size;
1114         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1115         total = PAGE_SIZE << page_order;
1116
1117         byte_count = 0;
1118         agp_offset = request->agp_start;
1119
1120         DRM_DEBUG("count:      %d\n", count);
1121         DRM_DEBUG("order:      %d\n", order);
1122         DRM_DEBUG("size:       %d\n", size);
1123         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1124         DRM_DEBUG("alignment:  %d\n", alignment);
1125         DRM_DEBUG("page_order: %d\n", page_order);
1126         DRM_DEBUG("total:      %d\n", total);
1127
1128         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1129                 return -EINVAL;
1130
1131         spin_lock(&dev->buf_lock);
1132         if (dev->buf_use) {
1133                 spin_unlock(&dev->buf_lock);
1134                 return -EBUSY;
1135         }
1136         atomic_inc(&dev->buf_alloc);
1137         spin_unlock(&dev->buf_lock);
1138
1139         mutex_lock(&dev->struct_mutex);
1140         entry = &dma->bufs[order];
1141         if (entry->buf_count) {
1142                 mutex_unlock(&dev->struct_mutex);
1143                 atomic_dec(&dev->buf_alloc);
1144                 return -ENOMEM; /* May only call once for each order */
1145         }
1146
1147         if (count < 0 || count > 4096) {
1148                 mutex_unlock(&dev->struct_mutex);
1149                 atomic_dec(&dev->buf_alloc);
1150                 return -EINVAL;
1151         }
1152
1153         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1154         if (!entry->buflist) {
1155                 mutex_unlock(&dev->struct_mutex);
1156                 atomic_dec(&dev->buf_alloc);
1157                 return -ENOMEM;
1158         }
1159
1160         entry->buf_size = size;
1161         entry->page_order = page_order;
1162
1163         offset = 0;
1164
1165         while (entry->buf_count < count) {
1166                 buf = &entry->buflist[entry->buf_count];
1167                 buf->idx = dma->buf_count + entry->buf_count;
1168                 buf->total = alignment;
1169                 buf->order = order;
1170                 buf->used = 0;
1171
1172                 buf->offset = (dma->byte_count + offset);
1173                 buf->bus_address = agp_offset + offset;
1174                 buf->address = (void *)(agp_offset + offset
1175                                         + (unsigned long)dev->sg->virtual);
1176                 buf->next = NULL;
1177                 buf->waiting = 0;
1178                 buf->pending = 0;
1179                 buf->file_priv = NULL;
1180
1181                 buf->dev_priv_size = dev->driver->dev_priv_size;
1182                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1183                 if (!buf->dev_private) {
1184                         /* Set count correctly so we free the proper amount. */
1185                         entry->buf_count = count;
1186                         drm_cleanup_buf_error(dev, entry);
1187                         mutex_unlock(&dev->struct_mutex);
1188                         atomic_dec(&dev->buf_alloc);
1189                         return -ENOMEM;
1190                 }
1191
1192                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1193
1194                 offset += alignment;
1195                 entry->buf_count++;
1196                 byte_count += PAGE_SIZE << page_order;
1197         }
1198
1199         DRM_DEBUG("byte_count: %d\n", byte_count);
1200
1201         temp_buflist = krealloc(dma->buflist,
1202                                 (dma->buf_count + entry->buf_count) *
1203                                 sizeof(*dma->buflist), GFP_KERNEL);
1204         if (!temp_buflist) {
1205                 /* Free the entry because it isn't valid */
1206                 drm_cleanup_buf_error(dev, entry);
1207                 mutex_unlock(&dev->struct_mutex);
1208                 atomic_dec(&dev->buf_alloc);
1209                 return -ENOMEM;
1210         }
1211         dma->buflist = temp_buflist;
1212
1213         for (i = 0; i < entry->buf_count; i++) {
1214                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1215         }
1216
1217         dma->buf_count += entry->buf_count;
1218         dma->seg_count += entry->seg_count;
1219         dma->page_count += byte_count >> PAGE_SHIFT;
1220         dma->byte_count += byte_count;
1221
1222         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1223         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1224
1225         mutex_unlock(&dev->struct_mutex);
1226
1227         request->count = entry->buf_count;
1228         request->size = size;
1229
1230         dma->flags = _DRM_DMA_USE_SG;
1231
1232         atomic_dec(&dev->buf_alloc);
1233         return 0;
1234 }
1235
1236 /*
1237  * Add buffers for DMA transfers (ioctl).
1238  *
1239  * \param inode device inode.
1240  * \param file_priv DRM file private.
1241  * \param cmd command.
1242  * \param arg pointer to a struct drm_buf_desc request.
1243  * \return zero on success or a negative number on failure.
1244  *
1245  * According with the memory type specified in drm_buf_desc::flags and the
1246  * build options, it dispatches the call either to addbufs_agp(),
1247  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1248  * PCI memory respectively.
1249  */
1250 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1251                        struct drm_file *file_priv)
1252 {
1253         struct drm_buf_desc *request = data;
1254         int ret;
1255
1256         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1257                 return -EOPNOTSUPP;
1258
1259         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1260                 return -EOPNOTSUPP;
1261
1262 #if IS_ENABLED(CONFIG_AGP)
1263         if (request->flags & _DRM_AGP_BUFFER)
1264                 ret = drm_legacy_addbufs_agp(dev, request);
1265         else
1266 #endif
1267         if (request->flags & _DRM_SG_BUFFER)
1268                 ret = drm_legacy_addbufs_sg(dev, request);
1269         else if (request->flags & _DRM_FB_BUFFER)
1270                 ret = -EINVAL;
1271         else
1272                 ret = drm_legacy_addbufs_pci(dev, request);
1273
1274         return ret;
1275 }
1276
1277 /*
1278  * Get information about the buffer mappings.
1279  *
1280  * This was originally mean for debugging purposes, or by a sophisticated
1281  * client library to determine how best to use the available buffers (e.g.,
1282  * large buffers can be used for image transfer).
1283  *
1284  * \param inode device inode.
1285  * \param file_priv DRM file private.
1286  * \param cmd command.
1287  * \param arg pointer to a drm_buf_info structure.
1288  * \return zero on success or a negative number on failure.
1289  *
1290  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1291  * lock, preventing of allocating more buffers after this call. Information
1292  * about each requested buffer is then copied into user space.
1293  */
1294 int __drm_legacy_infobufs(struct drm_device *dev,
1295                         void *data, int *p,
1296                         int (*f)(void *, int, struct drm_buf_entry *))
1297 {
1298         struct drm_device_dma *dma = dev->dma;
1299         int i;
1300         int count;
1301
1302         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1303                 return -EOPNOTSUPP;
1304
1305         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1306                 return -EOPNOTSUPP;
1307
1308         if (!dma)
1309                 return -EINVAL;
1310
1311         spin_lock(&dev->buf_lock);
1312         if (atomic_read(&dev->buf_alloc)) {
1313                 spin_unlock(&dev->buf_lock);
1314                 return -EBUSY;
1315         }
1316         ++dev->buf_use;         /* Can't allocate more after this call */
1317         spin_unlock(&dev->buf_lock);
1318
1319         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1320                 if (dma->bufs[i].buf_count)
1321                         ++count;
1322         }
1323
1324         DRM_DEBUG("count = %d\n", count);
1325
1326         if (*p >= count) {
1327                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1328                         struct drm_buf_entry *from = &dma->bufs[i];
1329
1330                         if (from->buf_count) {
1331                                 if (f(data, count, from) < 0)
1332                                         return -EFAULT;
1333                                 DRM_DEBUG("%d %d %d %d %d\n",
1334                                           i,
1335                                           dma->bufs[i].buf_count,
1336                                           dma->bufs[i].buf_size,
1337                                           dma->bufs[i].low_mark,
1338                                           dma->bufs[i].high_mark);
1339                                 ++count;
1340                         }
1341                 }
1342         }
1343         *p = count;
1344
1345         return 0;
1346 }
1347
1348 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1349 {
1350         struct drm_buf_info *request = data;
1351         struct drm_buf_desc __user *to = &request->list[count];
1352         struct drm_buf_desc v = {.count = from->buf_count,
1353                                  .size = from->buf_size,
1354                                  .low_mark = from->low_mark,
1355                                  .high_mark = from->high_mark};
1356
1357         if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1358                 return -EFAULT;
1359         return 0;
1360 }
1361
1362 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1363                         struct drm_file *file_priv)
1364 {
1365         struct drm_buf_info *request = data;
1366
1367         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1368 }
1369
1370 /*
1371  * Specifies a low and high water mark for buffer allocation
1372  *
1373  * \param inode device inode.
1374  * \param file_priv DRM file private.
1375  * \param cmd command.
1376  * \param arg a pointer to a drm_buf_desc structure.
1377  * \return zero on success or a negative number on failure.
1378  *
1379  * Verifies that the size order is bounded between the admissible orders and
1380  * updates the respective drm_device_dma::bufs entry low and high water mark.
1381  *
1382  * \note This ioctl is deprecated and mostly never used.
1383  */
1384 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1385                         struct drm_file *file_priv)
1386 {
1387         struct drm_device_dma *dma = dev->dma;
1388         struct drm_buf_desc *request = data;
1389         int order;
1390         struct drm_buf_entry *entry;
1391
1392         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1393                 return -EOPNOTSUPP;
1394
1395         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1396                 return -EOPNOTSUPP;
1397
1398         if (!dma)
1399                 return -EINVAL;
1400
1401         DRM_DEBUG("%d, %d, %d\n",
1402                   request->size, request->low_mark, request->high_mark);
1403         order = order_base_2(request->size);
1404         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1405                 return -EINVAL;
1406         entry = &dma->bufs[order];
1407
1408         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1409                 return -EINVAL;
1410         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1411                 return -EINVAL;
1412
1413         entry->low_mark = request->low_mark;
1414         entry->high_mark = request->high_mark;
1415
1416         return 0;
1417 }
1418
1419 /*
1420  * Unreserve the buffers in list, previously reserved using drmDMA.
1421  *
1422  * \param inode device inode.
1423  * \param file_priv DRM file private.
1424  * \param cmd command.
1425  * \param arg pointer to a drm_buf_free structure.
1426  * \return zero on success or a negative number on failure.
1427  *
1428  * Calls free_buffer() for each used buffer.
1429  * This function is primarily used for debugging.
1430  */
1431 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1432                         struct drm_file *file_priv)
1433 {
1434         struct drm_device_dma *dma = dev->dma;
1435         struct drm_buf_free *request = data;
1436         int i;
1437         int idx;
1438         struct drm_buf *buf;
1439
1440         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1441                 return -EOPNOTSUPP;
1442
1443         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1444                 return -EOPNOTSUPP;
1445
1446         if (!dma)
1447                 return -EINVAL;
1448
1449         DRM_DEBUG("%d\n", request->count);
1450         for (i = 0; i < request->count; i++) {
1451                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1452                         return -EFAULT;
1453                 if (idx < 0 || idx >= dma->buf_count) {
1454                         DRM_ERROR("Index %d (of %d max)\n",
1455                                   idx, dma->buf_count - 1);
1456                         return -EINVAL;
1457                 }
1458                 idx = array_index_nospec(idx, dma->buf_count);
1459                 buf = dma->buflist[idx];
1460                 if (buf->file_priv != file_priv) {
1461                         DRM_ERROR("Process %d freeing buffer not owned\n",
1462                                   task_pid_nr(current));
1463                         return -EINVAL;
1464                 }
1465                 drm_legacy_free_buffer(dev, buf);
1466         }
1467
1468         return 0;
1469 }
1470
1471 /*
1472  * Maps all of the DMA buffers into client-virtual space (ioctl).
1473  *
1474  * \param inode device inode.
1475  * \param file_priv DRM file private.
1476  * \param cmd command.
1477  * \param arg pointer to a drm_buf_map structure.
1478  * \return zero on success or a negative number on failure.
1479  *
1480  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1481  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1482  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1483  * drm_mmap_dma().
1484  */
1485 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1486                          void __user **v,
1487                          int (*f)(void *, int, unsigned long,
1488                                  struct drm_buf *),
1489                                  struct drm_file *file_priv)
1490 {
1491         struct drm_device_dma *dma = dev->dma;
1492         int retcode = 0;
1493         unsigned long virtual;
1494         int i;
1495
1496         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1497                 return -EOPNOTSUPP;
1498
1499         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1500                 return -EOPNOTSUPP;
1501
1502         if (!dma)
1503                 return -EINVAL;
1504
1505         spin_lock(&dev->buf_lock);
1506         if (atomic_read(&dev->buf_alloc)) {
1507                 spin_unlock(&dev->buf_lock);
1508                 return -EBUSY;
1509         }
1510         dev->buf_use++;         /* Can't allocate more after this call */
1511         spin_unlock(&dev->buf_lock);
1512
1513         if (*p >= dma->buf_count) {
1514                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1515                     || (drm_core_check_feature(dev, DRIVER_SG)
1516                         && (dma->flags & _DRM_DMA_USE_SG))) {
1517                         struct drm_local_map *map = dev->agp_buffer_map;
1518                         unsigned long token = dev->agp_buffer_token;
1519
1520                         if (!map) {
1521                                 retcode = -EINVAL;
1522                                 goto done;
1523                         }
1524                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1525                                           PROT_READ | PROT_WRITE,
1526                                           MAP_SHARED,
1527                                           token);
1528                 } else {
1529                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1530                                           PROT_READ | PROT_WRITE,
1531                                           MAP_SHARED, 0);
1532                 }
1533                 if (virtual > -1024UL) {
1534                         /* Real error */
1535                         retcode = (signed long)virtual;
1536                         goto done;
1537                 }
1538                 *v = (void __user *)virtual;
1539
1540                 for (i = 0; i < dma->buf_count; i++) {
1541                         if (f(data, i, virtual, dma->buflist[i]) < 0) {
1542                                 retcode = -EFAULT;
1543                                 goto done;
1544                         }
1545                 }
1546         }
1547       done:
1548         *p = dma->buf_count;
1549         DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1550
1551         return retcode;
1552 }
1553
1554 static int map_one_buf(void *data, int idx, unsigned long virtual,
1555                         struct drm_buf *buf)
1556 {
1557         struct drm_buf_map *request = data;
1558         unsigned long address = virtual + buf->offset;  /* *** */
1559
1560         if (copy_to_user(&request->list[idx].idx, &buf->idx,
1561                          sizeof(request->list[0].idx)))
1562                 return -EFAULT;
1563         if (copy_to_user(&request->list[idx].total, &buf->total,
1564                          sizeof(request->list[0].total)))
1565                 return -EFAULT;
1566         if (clear_user(&request->list[idx].used, sizeof(int)))
1567                 return -EFAULT;
1568         if (copy_to_user(&request->list[idx].address, &address,
1569                          sizeof(address)))
1570                 return -EFAULT;
1571         return 0;
1572 }
1573
1574 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1575                        struct drm_file *file_priv)
1576 {
1577         struct drm_buf_map *request = data;
1578
1579         return __drm_legacy_mapbufs(dev, data, &request->count,
1580                                     &request->virtual, map_one_buf,
1581                                     file_priv);
1582 }
1583
1584 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1585                   struct drm_file *file_priv)
1586 {
1587         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1588                 return -EOPNOTSUPP;
1589
1590         if (dev->driver->dma_ioctl)
1591                 return dev->driver->dma_ioctl(dev, data, file_priv);
1592         else
1593                 return -EINVAL;
1594 }
1595
1596 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1597 {
1598         struct drm_map_list *entry;
1599
1600         list_for_each_entry(entry, &dev->maplist, head) {
1601                 if (entry->map && entry->map->type == _DRM_SHM &&
1602                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1603                         return entry->map;
1604                 }
1605         }
1606         return NULL;
1607 }
1608 EXPORT_SYMBOL(drm_legacy_getsarea);