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_device.h>
  44 #include <drm/drm_drv.h>
  45 #include <drm/drm_file.h>
  46 #include <drm/drm_print.h>
  47
  48 #include "drm_legacy.h"
  49
  50
  51 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  52                                                   struct drm_local_map *map)
  53 {
  54         struct drm_map_list *entry;
  55
  56         list_for_each_entry(entry, &dev->maplist, head) {
  57                 /*
  58                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  59                  * while PCI resources may live above that, we only compare the
  60                  * lower 32 bits of the map offset for maps of type
  61                  * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  62                  * It is assumed that if a driver have more than one resource
  63                  * of each type, the lower 32 bits are different.
  64                  */
  65                 if (!entry->map ||
  66                     map->type != entry->map->type ||
  67                     entry->master != dev->master)
  68                         continue;
  69                 switch (map->type) {
  70                 case _DRM_SHM:
  71                         if (map->flags != _DRM_CONTAINS_LOCK)
  72                                 break;
  73                         return entry;
  74                 case _DRM_REGISTERS:
  75                 case _DRM_FRAME_BUFFER:
  76                         if ((entry->map->offset & 0xffffffff) ==
  77                             (map->offset & 0xffffffff))
  78                                 return entry;
  79                         break;
  80                 default: /* Make gcc happy */
  81                         break;
  82                 }
  83                 if (entry->map->offset == map->offset)
  84                         return entry;
  85         }
  86
  87         return NULL;
  88 }
  89
  90 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  91                           unsigned long user_token, int hashed_handle, int shm)
  92 {
  93         int use_hashed_handle, shift;
  94         unsigned long add;
  95
  96 #if (BITS_PER_LONG == 64)
  97         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  98 #elif (BITS_PER_LONG == 32)
  99         use_hashed_handle = hashed_handle;
 100 #else
 101 #error Unsupported long size. Neither 64 nor 32 bits.
 102 #endif
 103
 104         if (!use_hashed_handle) {
 105                 int ret;
 106
 107                 hash->key = user_token >> PAGE_SHIFT;
 108                 ret = drm_ht_insert_item(&dev->map_hash, hash);
 109                 if (ret != -EINVAL)
 110                         return ret;
 111         }
 112
 113         shift = 0;
 114         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 115         if (shm && (SHMLBA > PAGE_SIZE)) {
 116                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 117
 118                 /* For shared memory, we have to preserve the SHMLBA
 119                  * bits of the eventual vma->vm_pgoff value during
 120                  * mmap().  Otherwise we run into cache aliasing problems
 121                  * on some platforms.  On these platforms, the pgoff of
 122                  * a mmap() request is used to pick a suitable virtual
 123                  * address for the mmap() region such that it will not
 124                  * cause cache aliasing problems.
 125                  *
 126                  * Therefore, make sure the SHMLBA relevant bits of the
 127                  * hash value we use are equal to those in the original
 128                  * kernel virtual address.
 129                  */
 130                 shift = bits;
 131                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 132         }
 133
 134         return drm_ht_just_insert_please(&dev->map_hash, hash,
 135                                          user_token, 32 - PAGE_SHIFT - 3,
 136                                          shift, add);
 137 }
 138
 139 /*
 140  * Core function to create a range of memory available for mapping by a
 141  * non-root process.
 142  *
 143  * Adjusts the memory offset to its absolute value according to the mapping
 144  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 145  * applicable and if supported by the kernel.
 146  */
 147 static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
 148                            unsigned int size, enum drm_map_type type,
 149                            enum drm_map_flags flags,
 150                            struct drm_map_list **maplist)
 151 {
 152         struct drm_local_map *map;
 153         struct drm_map_list *list;
 154         unsigned long user_token;
 155         int ret;
 156
 157         map = kmalloc(sizeof(*map), GFP_KERNEL);
 158         if (!map)
 159                 return -ENOMEM;
 160
 161         map->offset = offset;
 162         map->size = size;
 163         map->flags = flags;
 164         map->type = type;
 165
 166         /* Only allow shared memory to be removable since we only keep enough
 167          * book keeping information about shared memory to allow for removal
 168          * when processes fork.
 169          */
 170         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 171                 kfree(map);
 172                 return -EINVAL;
 173         }
 174         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 175                   (unsigned long long)map->offset, map->size, map->type);
 176
 177         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 178          * hole created by that and it works around various broken drivers that use
 179          * a non-aligned quantity to map the SAREA. --BenH
 180          */
 181         if (map->type == _DRM_SHM)
 182                 map->size = PAGE_ALIGN(map->size);
 183
 184         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 185                 kfree(map);
 186                 return -EINVAL;
 187         }
 188         map->mtrr = -1;
 189         map->handle = NULL;
 190
 191         switch (map->type) {
 192         case _DRM_REGISTERS:
 193         case _DRM_FRAME_BUFFER:
 194 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 195                 if (map->offset + (map->size-1) < map->offset ||
 196                     map->offset < virt_to_phys(high_memory)) {
 197                         kfree(map);
 198                         return -EINVAL;
 199                 }
 200 #endif
 201                 /* Some drivers preinitialize some maps, without the X Server
 202                  * needing to be aware of it.  Therefore, we just return success
 203                  * when the server tries to create a duplicate map.
 204                  */
 205                 list = drm_find_matching_map(dev, map);
 206                 if (list != NULL) {
 207                         if (list->map->size != map->size) {
 208                                 DRM_DEBUG("Matching maps of type %d with "
 209                                           "mismatched sizes, (%ld vs %ld)\n",
 210                                           map->type, map->size,
 211                                           list->map->size);
 212                                 list->map->size = map->size;
 213                         }
 214
 215                         kfree(map);
 216                         *maplist = list;
 217                         return 0;
 218                 }
 219
 220                 if (map->type == _DRM_FRAME_BUFFER ||
 221                     (map->flags & _DRM_WRITE_COMBINING)) {
 222                         map->mtrr =
 223                                 arch_phys_wc_add(map->offset, map->size);
 224                 }
 225                 if (map->type == _DRM_REGISTERS) {
 226                         if (map->flags & _DRM_WRITE_COMBINING)
 227                                 map->handle = ioremap_wc(map->offset,
 228                                                          map->size);
 229                         else
 230                                 map->handle = ioremap(map->offset, map->size);
 231                         if (!map->handle) {
 232                                 kfree(map);
 233                                 return -ENOMEM;
 234                         }
 235                 }
 236
 237                 break;
 238         case _DRM_SHM:
 239                 list = drm_find_matching_map(dev, map);
 240                 if (list != NULL) {
 241                         if (list->map->size != map->size) {
 242                                 DRM_DEBUG("Matching maps of type %d with "
 243                                           "mismatched sizes, (%ld vs %ld)\n",
 244                                           map->type, map->size, list->map->size);
 245                                 list->map->size = map->size;
 246                         }
 247
 248                         kfree(map);
 249                         *maplist = list;
 250                         return 0;
 251                 }
 252                 map->handle = vmalloc_user(map->size);
 253                 DRM_DEBUG("%lu %d %p\n",
 254                           map->size, order_base_2(map->size), map->handle);
 255                 if (!map->handle) {
 256                         kfree(map);
 257                         return -ENOMEM;
 258                 }
 259                 map->offset = (unsigned long)map->handle;
 260                 if (map->flags & _DRM_CONTAINS_LOCK) {
 261                         /* Prevent a 2nd X Server from creating a 2nd lock */
 262                         if (dev->master->lock.hw_lock != NULL) {
 263                                 vfree(map->handle);
 264                                 kfree(map);
 265                                 return -EBUSY;
 266                         }
 267                         dev->sigdata.lock = dev->master->lock.hw_lock = map->handle;    /* Pointer to lock */
 268                 }
 269                 break;
 270         case _DRM_AGP: {
 271                 struct drm_agp_mem *entry;
 272                 int valid = 0;
 273
 274                 if (!dev->agp) {
 275                         kfree(map);
 276                         return -EINVAL;
 277                 }
 278 #ifdef __alpha__
 279                 map->offset += dev->hose->mem_space->start;
 280 #endif
 281                 /* In some cases (i810 driver), user space may have already
 282                  * added the AGP base itself, because dev->agp->base previously
 283                  * only got set during AGP enable.  So, only add the base
 284                  * address if the map's offset isn't already within the
 285                  * aperture.
 286                  */
 287                 if (map->offset < dev->agp->base ||
 288                     map->offset > dev->agp->base +
 289                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 290                         map->offset += dev->agp->base;
 291                 }
 292                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 293
 294                 /* This assumes the DRM is in total control of AGP space.
 295                  * It's not always the case as AGP can be in the control
 296                  * of user space (i.e. i810 driver). So this loop will get
 297                  * skipped and we double check that dev->agp->memory is
 298                  * actually set as well as being invalid before EPERM'ing
 299                  */
 300                 list_for_each_entry(entry, &dev->agp->memory, head) {
 301                         if ((map->offset >= entry->bound) &&
 302                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 303                                 valid = 1;
 304                                 break;
 305                         }
 306                 }
 307                 if (!list_empty(&dev->agp->memory) && !valid) {
 308                         kfree(map);
 309                         return -EPERM;
 310                 }
 311                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 312                           (unsigned long long)map->offset, map->size);
 313
 314                 break;
 315         }
 316         case _DRM_SCATTER_GATHER:
 317                 if (!dev->sg) {
 318                         kfree(map);
 319                         return -EINVAL;
 320                 }
 321                 map->offset += (unsigned long)dev->sg->virtual;
 322                 break;
 323         case _DRM_CONSISTENT:
 324                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 325                  * As we're limiting the address to 2^32-1 (or less),
 326                  * casting it down to 32 bits is no problem, but we
 327                  * need to point to a 64bit variable first.
 328                  */
 329                 map->handle = dma_alloc_coherent(dev->dev,
 330                                                  map->size,
 331                                                  &map->offset,
 332                                                  GFP_KERNEL);
 333                 if (!map->handle) {
 334                         kfree(map);
 335                         return -ENOMEM;
 336                 }
 337                 break;
 338         default:
 339                 kfree(map);
 340                 return -EINVAL;
 341         }
 342
 343         list = kzalloc(sizeof(*list), GFP_KERNEL);
 344         if (!list) {
 345                 if (map->type == _DRM_REGISTERS)
 346                         iounmap(map->handle);
 347                 kfree(map);
 348                 return -EINVAL;
 349         }
 350         list->map = map;
 351
 352         mutex_lock(&dev->struct_mutex);
 353         list_add(&list->head, &dev->maplist);
 354
 355         /* Assign a 32-bit handle */
 356         /* We do it here so that dev->struct_mutex protects the increment */
 357         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 358                 map->offset;
 359         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 360                              (map->type == _DRM_SHM));
 361         if (ret) {
 362                 if (map->type == _DRM_REGISTERS)
 363                         iounmap(map->handle);
 364                 kfree(map);
 365                 kfree(list);
 366                 mutex_unlock(&dev->struct_mutex);
 367                 return ret;
 368         }
 369
 370         list->user_token = list->hash.key << PAGE_SHIFT;
 371         mutex_unlock(&dev->struct_mutex);
 372
 373         if (!(map->flags & _DRM_DRIVER))
 374                 list->master = dev->master;
 375         *maplist = list;
 376         return 0;
 377 }
 378
 379 int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
 380                       unsigned int size, enum drm_map_type type,
 381                       enum drm_map_flags flags, struct drm_local_map **map_ptr)
 382 {
 383         struct drm_map_list *list;
 384         int rc;
 385
 386         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 387         if (!rc)
 388                 *map_ptr = list->map;
 389         return rc;
 390 }
 391 EXPORT_SYMBOL(drm_legacy_addmap);
 392
 393 struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
 394                                          unsigned int token)
 395 {
 396         struct drm_map_list *_entry;
 397
 398         list_for_each_entry(_entry, &dev->maplist, head)
 399                 if (_entry->user_token == token)
 400                         return _entry->map;
 401         return NULL;
 402 }
 403 EXPORT_SYMBOL(drm_legacy_findmap);
 404
 405 /*
 406  * Ioctl to specify a range of memory that is available for mapping by a
 407  * non-root process.
 408  *
 409  * \param inode device inode.
 410  * \param file_priv DRM file private.
 411  * \param cmd command.
 412  * \param arg pointer to a drm_map structure.
 413  * \return zero on success or a negative value on error.
 414  *
 415  */
 416 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
 417                             struct drm_file *file_priv)
 418 {
 419         struct drm_map *map = data;
 420         struct drm_map_list *maplist;
 421         int err;
 422
 423         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 424                 return -EPERM;
 425
 426         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 427             !drm_core_check_feature(dev, DRIVER_LEGACY))
 428                 return -EOPNOTSUPP;
 429
 430         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 431                               map->flags, &maplist);
 432
 433         if (err)
 434                 return err;
 435
 436         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 437         map->handle = (void *)(unsigned long)maplist->user_token;
 438
 439         /*
 440          * It appears that there are no users of this value whatsoever --
 441          * drmAddMap just discards it.  Let's not encourage its use.
 442          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 443          *  it's not a real mtrr index anymore.)
 444          */
 445         map->mtrr = -1;
 446
 447         return 0;
 448 }
 449
 450 /*
 451  * Get a mapping information.
 452  *
 453  * \param inode device inode.
 454  * \param file_priv DRM file private.
 455  * \param cmd command.
 456  * \param arg user argument, pointing to a drm_map structure.
 457  *
 458  * \return zero on success or a negative number on failure.
 459  *
 460  * Searches for the mapping with the specified offset and copies its information
 461  * into userspace
 462  */
 463 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
 464                             struct drm_file *file_priv)
 465 {
 466         struct drm_map *map = data;
 467         struct drm_map_list *r_list = NULL;
 468         struct list_head *list;
 469         int idx;
 470         int i;
 471
 472         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 473             !drm_core_check_feature(dev, DRIVER_LEGACY))
 474                 return -EOPNOTSUPP;
 475
 476         idx = map->offset;
 477         if (idx < 0)
 478                 return -EINVAL;
 479
 480         i = 0;
 481         mutex_lock(&dev->struct_mutex);
 482         list_for_each(list, &dev->maplist) {
 483                 if (i == idx) {
 484                         r_list = list_entry(list, struct drm_map_list, head);
 485                         break;
 486                 }
 487                 i++;
 488         }
 489         if (!r_list || !r_list->map) {
 490                 mutex_unlock(&dev->struct_mutex);
 491                 return -EINVAL;
 492         }
 493
 494         map->offset = r_list->map->offset;
 495         map->size = r_list->map->size;
 496         map->type = r_list->map->type;
 497         map->flags = r_list->map->flags;
 498         map->handle = (void *)(unsigned long) r_list->user_token;
 499         map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
 500
 501         mutex_unlock(&dev->struct_mutex);
 502
 503         return 0;
 504 }
 505
 506 /*
 507  * Remove a map private from list and deallocate resources if the mapping
 508  * isn't in use.
 509  *
 510  * Searches the map on drm_device::maplist, removes it from the list, see if
 511  * it's being used, and free any associated resource (such as MTRR's) if it's not
 512  * being on use.
 513  *
 514  * \sa drm_legacy_addmap
 515  */
 516 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 517 {
 518         struct drm_map_list *r_list = NULL, *list_t;
 519         int found = 0;
 520         struct drm_master *master;
 521
 522         /* Find the list entry for the map and remove it */
 523         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 524                 if (r_list->map == map) {
 525                         master = r_list->master;
 526                         list_del(&r_list->head);
 527                         drm_ht_remove_key(&dev->map_hash,
 528                                           r_list->user_token >> PAGE_SHIFT);
 529                         kfree(r_list);
 530                         found = 1;
 531                         break;
 532                 }
 533         }
 534
 535         if (!found)
 536                 return -EINVAL;
 537
 538         switch (map->type) {
 539         case _DRM_REGISTERS:
 540                 iounmap(map->handle);
 541                 fallthrough;
 542         case _DRM_FRAME_BUFFER:
 543                 arch_phys_wc_del(map->mtrr);
 544                 break;
 545         case _DRM_SHM:
 546                 vfree(map->handle);
 547                 if (master) {
 548                         if (dev->sigdata.lock == master->lock.hw_lock)
 549                                 dev->sigdata.lock = NULL;
 550                         master->lock.hw_lock = NULL;   /* SHM removed */
 551                         master->lock.file_priv = NULL;
 552                         wake_up_interruptible_all(&master->lock.lock_queue);
 553                 }
 554                 break;
 555         case _DRM_AGP:
 556         case _DRM_SCATTER_GATHER:
 557                 break;
 558         case _DRM_CONSISTENT:
 559                 dma_free_coherent(dev->dev,
 560                                   map->size,
 561                                   map->handle,
 562                                   map->offset);
 563                 break;
 564         }
 565         kfree(map);
 566
 567         return 0;
 568 }
 569 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
 570
 571 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
 572 {
 573         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 574             !drm_core_check_feature(dev, DRIVER_LEGACY))
 575                 return;
 576
 577         mutex_lock(&dev->struct_mutex);
 578         drm_legacy_rmmap_locked(dev, map);
 579         mutex_unlock(&dev->struct_mutex);
 580 }
 581 EXPORT_SYMBOL(drm_legacy_rmmap);
 582
 583 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
 584 {
 585         struct drm_map_list *r_list, *list_temp;
 586
 587         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 588                 return;
 589
 590         mutex_lock(&dev->struct_mutex);
 591         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 592                 if (r_list->master == master) {
 593                         drm_legacy_rmmap_locked(dev, r_list->map);
 594                         r_list = NULL;
 595                 }
 596         }
 597         mutex_unlock(&dev->struct_mutex);
 598 }
 599
 600 void drm_legacy_rmmaps(struct drm_device *dev)
 601 {
 602         struct drm_map_list *r_list, *list_temp;
 603
 604         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
 605                 drm_legacy_rmmap(dev, r_list->map);
 606 }
 607
 608 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 609  * the last close of the device, and this is necessary for cleanup when things
 610  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 611  * like a pointless exercise since they're going away anyway.
 612  *
 613  * One use case might be after addmap is allowed for normal users for SHM and
 614  * gets used by drivers that the server doesn't need to care about.  This seems
 615  * unlikely.
 616  *
 617  * \param inode device inode.
 618  * \param file_priv DRM file private.
 619  * \param cmd command.
 620  * \param arg pointer to a struct drm_map structure.
 621  * \return zero on success or a negative value on error.
 622  */
 623 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
 624                            struct drm_file *file_priv)
 625 {
 626         struct drm_map *request = data;
 627         struct drm_local_map *map = NULL;
 628         struct drm_map_list *r_list;
 629         int ret;
 630
 631         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 632             !drm_core_check_feature(dev, DRIVER_LEGACY))
 633                 return -EOPNOTSUPP;
 634
 635         mutex_lock(&dev->struct_mutex);
 636         list_for_each_entry(r_list, &dev->maplist, head) {
 637                 if (r_list->map &&
 638                     r_list->user_token == (unsigned long)request->handle &&
 639                     r_list->map->flags & _DRM_REMOVABLE) {
 640                         map = r_list->map;
 641                         break;
 642                 }
 643         }
 644
 645         /* List has wrapped around to the head pointer, or it's empty we didn't
 646          * find anything.
 647          */
 648         if (list_empty(&dev->maplist) || !map) {
 649                 mutex_unlock(&dev->struct_mutex);
 650                 return -EINVAL;
 651         }
 652
 653         /* Register and framebuffer maps are permanent */
 654         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 655                 mutex_unlock(&dev->struct_mutex);
 656                 return 0;
 657         }
 658
 659         ret = drm_legacy_rmmap_locked(dev, map);
 660
 661         mutex_unlock(&dev->struct_mutex);
 662
 663         return ret;
 664 }
 665
 666 /*
 667  * Cleanup after an error on one of the addbufs() functions.
 668  *
 669  * \param dev DRM device.
 670  * \param entry buffer entry where the error occurred.
 671  *
 672  * Frees any pages and buffers associated with the given entry.
 673  */
 674 static void drm_cleanup_buf_error(struct drm_device *dev,
 675                                   struct drm_buf_entry *entry)
 676 {
 677         drm_dma_handle_t *dmah;
 678         int i;
 679
 680         if (entry->seg_count) {
 681                 for (i = 0; i < entry->seg_count; i++) {
 682                         if (entry->seglist[i]) {
 683                                 dmah = entry->seglist[i];
 684                                 dma_free_coherent(dev->dev,
 685                                                   dmah->size,
 686                                                   dmah->vaddr,
 687                                                   dmah->busaddr);
 688                                 kfree(dmah);
 689                         }
 690                 }
 691                 kfree(entry->seglist);
 692
 693                 entry->seg_count = 0;
 694         }
 695
 696         if (entry->buf_count) {
 697                 for (i = 0; i < entry->buf_count; i++) {
 698                         kfree(entry->buflist[i].dev_private);
 699                 }
 700                 kfree(entry->buflist);
 701
 702                 entry->buf_count = 0;
 703         }
 704 }
 705
 706 #if IS_ENABLED(CONFIG_AGP)
 707 /*
 708  * Add AGP buffers for DMA transfers.
 709  *
 710  * \param dev struct drm_device to which the buffers are to be added.
 711  * \param request pointer to a struct drm_buf_desc describing the request.
 712  * \return zero on success or a negative number on failure.
 713  *
 714  * After some sanity checks creates a drm_buf structure for each buffer and
 715  * reallocates the buffer list of the same size order to accommodate the new
 716  * buffers.
 717  */
 718 int drm_legacy_addbufs_agp(struct drm_device *dev,
 719                            struct drm_buf_desc *request)
 720 {
 721         struct drm_device_dma *dma = dev->dma;
 722         struct drm_buf_entry *entry;
 723         struct drm_agp_mem *agp_entry;
 724         struct drm_buf *buf;
 725         unsigned long offset;
 726         unsigned long agp_offset;
 727         int count;
 728         int order;
 729         int size;
 730         int alignment;
 731         int page_order;
 732         int total;
 733         int byte_count;
 734         int i, valid;
 735         struct drm_buf **temp_buflist;
 736
 737         if (!dma)
 738                 return -EINVAL;
 739
 740         count = request->count;
 741         order = order_base_2(request->size);
 742         size = 1 << order;
 743
 744         alignment = (request->flags & _DRM_PAGE_ALIGN)
 745             ? PAGE_ALIGN(size) : size;
 746         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 747         total = PAGE_SIZE << page_order;
 748
 749         byte_count = 0;
 750         agp_offset = dev->agp->base + request->agp_start;
 751
 752         DRM_DEBUG("count:      %d\n", count);
 753         DRM_DEBUG("order:      %d\n", order);
 754         DRM_DEBUG("size:       %d\n", size);
 755         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 756         DRM_DEBUG("alignment:  %d\n", alignment);
 757         DRM_DEBUG("page_order: %d\n", page_order);
 758         DRM_DEBUG("total:      %d\n", total);
 759
 760         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 761                 return -EINVAL;
 762
 763         /* Make sure buffers are located in AGP memory that we own */
 764         valid = 0;
 765         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 766                 if ((agp_offset >= agp_entry->bound) &&
 767                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 768                         valid = 1;
 769                         break;
 770                 }
 771         }
 772         if (!list_empty(&dev->agp->memory) && !valid) {
 773                 DRM_DEBUG("zone invalid\n");
 774                 return -EINVAL;
 775         }
 776         spin_lock(&dev->buf_lock);
 777         if (dev->buf_use) {
 778                 spin_unlock(&dev->buf_lock);
 779                 return -EBUSY;
 780         }
 781         atomic_inc(&dev->buf_alloc);
 782         spin_unlock(&dev->buf_lock);
 783
 784         mutex_lock(&dev->struct_mutex);
 785         entry = &dma->bufs[order];
 786         if (entry->buf_count) {
 787                 mutex_unlock(&dev->struct_mutex);
 788                 atomic_dec(&dev->buf_alloc);
 789                 return -ENOMEM; /* May only call once for each order */
 790         }
 791
 792         if (count < 0 || count > 4096) {
 793                 mutex_unlock(&dev->struct_mutex);
 794                 atomic_dec(&dev->buf_alloc);
 795                 return -EINVAL;
 796         }
 797
 798         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 799         if (!entry->buflist) {
 800                 mutex_unlock(&dev->struct_mutex);
 801                 atomic_dec(&dev->buf_alloc);
 802                 return -ENOMEM;
 803         }
 804
 805         entry->buf_size = size;
 806         entry->page_order = page_order;
 807
 808         offset = 0;
 809
 810         while (entry->buf_count < count) {
 811                 buf = &entry->buflist[entry->buf_count];
 812                 buf->idx = dma->buf_count + entry->buf_count;
 813                 buf->total = alignment;
 814                 buf->order = order;
 815                 buf->used = 0;
 816
 817                 buf->offset = (dma->byte_count + offset);
 818                 buf->bus_address = agp_offset + offset;
 819                 buf->address = (void *)(agp_offset + offset);
 820                 buf->next = NULL;
 821                 buf->waiting = 0;
 822                 buf->pending = 0;
 823                 buf->file_priv = NULL;
 824
 825                 buf->dev_priv_size = dev->driver->dev_priv_size;
 826                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 827                 if (!buf->dev_private) {
 828                         /* Set count correctly so we free the proper amount. */
 829                         entry->buf_count = count;
 830                         drm_cleanup_buf_error(dev, entry);
 831                         mutex_unlock(&dev->struct_mutex);
 832                         atomic_dec(&dev->buf_alloc);
 833                         return -ENOMEM;
 834                 }
 835
 836                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 837
 838                 offset += alignment;
 839                 entry->buf_count++;
 840                 byte_count += PAGE_SIZE << page_order;
 841         }
 842
 843         DRM_DEBUG("byte_count: %d\n", byte_count);
 844
 845         temp_buflist = krealloc(dma->buflist,
 846                                 (dma->buf_count + entry->buf_count) *
 847                                 sizeof(*dma->buflist), GFP_KERNEL);
 848         if (!temp_buflist) {
 849                 /* Free the entry because it isn't valid */
 850                 drm_cleanup_buf_error(dev, entry);
 851                 mutex_unlock(&dev->struct_mutex);
 852                 atomic_dec(&dev->buf_alloc);
 853                 return -ENOMEM;
 854         }
 855         dma->buflist = temp_buflist;
 856
 857         for (i = 0; i < entry->buf_count; i++) {
 858                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 859         }
 860
 861         dma->buf_count += entry->buf_count;
 862         dma->seg_count += entry->seg_count;
 863         dma->page_count += byte_count >> PAGE_SHIFT;
 864         dma->byte_count += byte_count;
 865
 866         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 867         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 868
 869         mutex_unlock(&dev->struct_mutex);
 870
 871         request->count = entry->buf_count;
 872         request->size = size;
 873
 874         dma->flags = _DRM_DMA_USE_AGP;
 875
 876         atomic_dec(&dev->buf_alloc);
 877         return 0;
 878 }
 879 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
 880 #endif /* CONFIG_AGP */
 881
 882 int drm_legacy_addbufs_pci(struct drm_device *dev,
 883                            struct drm_buf_desc *request)
 884 {
 885         struct drm_device_dma *dma = dev->dma;
 886         int count;
 887         int order;
 888         int size;
 889         int total;
 890         int page_order;
 891         struct drm_buf_entry *entry;
 892         drm_dma_handle_t *dmah;
 893         struct drm_buf *buf;
 894         int alignment;
 895         unsigned long offset;
 896         int i;
 897         int byte_count;
 898         int page_count;
 899         unsigned long *temp_pagelist;
 900         struct drm_buf **temp_buflist;
 901
 902         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 903                 return -EOPNOTSUPP;
 904
 905         if (!dma)
 906                 return -EINVAL;
 907
 908         if (!capable(CAP_SYS_ADMIN))
 909                 return -EPERM;
 910
 911         count = request->count;
 912         order = order_base_2(request->size);
 913         size = 1 << order;
 914
 915         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 916                   request->count, request->size, size, order);
 917
 918         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 919                 return -EINVAL;
 920
 921         alignment = (request->flags & _DRM_PAGE_ALIGN)
 922             ? PAGE_ALIGN(size) : size;
 923         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 924         total = PAGE_SIZE << page_order;
 925
 926         spin_lock(&dev->buf_lock);
 927         if (dev->buf_use) {
 928                 spin_unlock(&dev->buf_lock);
 929                 return -EBUSY;
 930         }
 931         atomic_inc(&dev->buf_alloc);
 932         spin_unlock(&dev->buf_lock);
 933
 934         mutex_lock(&dev->struct_mutex);
 935         entry = &dma->bufs[order];
 936         if (entry->buf_count) {
 937                 mutex_unlock(&dev->struct_mutex);
 938                 atomic_dec(&dev->buf_alloc);
 939                 return -ENOMEM; /* May only call once for each order */
 940         }
 941
 942         if (count < 0 || count > 4096) {
 943                 mutex_unlock(&dev->struct_mutex);
 944                 atomic_dec(&dev->buf_alloc);
 945                 return -EINVAL;
 946         }
 947
 948         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 949         if (!entry->buflist) {
 950                 mutex_unlock(&dev->struct_mutex);
 951                 atomic_dec(&dev->buf_alloc);
 952                 return -ENOMEM;
 953         }
 954
 955         entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
 956         if (!entry->seglist) {
 957                 kfree(entry->buflist);
 958                 mutex_unlock(&dev->struct_mutex);
 959                 atomic_dec(&dev->buf_alloc);
 960                 return -ENOMEM;
 961         }
 962
 963         /* Keep the original pagelist until we know all the allocations
 964          * have succeeded
 965          */
 966         temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
 967                                       sizeof(*dma->pagelist),
 968                                       GFP_KERNEL);
 969         if (!temp_pagelist) {
 970                 kfree(entry->buflist);
 971                 kfree(entry->seglist);
 972                 mutex_unlock(&dev->struct_mutex);
 973                 atomic_dec(&dev->buf_alloc);
 974                 return -ENOMEM;
 975         }
 976         memcpy(temp_pagelist,
 977                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 978         DRM_DEBUG("pagelist: %d entries\n",
 979                   dma->page_count + (count << page_order));
 980
 981         entry->buf_size = size;
 982         entry->page_order = page_order;
 983         byte_count = 0;
 984         page_count = 0;
 985
 986         while (entry->buf_count < count) {
 987                 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
 988                 if (!dmah) {
 989                         /* Set count correctly so we free the proper amount. */
 990                         entry->buf_count = count;
 991                         entry->seg_count = count;
 992                         drm_cleanup_buf_error(dev, entry);
 993                         kfree(temp_pagelist);
 994                         mutex_unlock(&dev->struct_mutex);
 995                         atomic_dec(&dev->buf_alloc);
 996                         return -ENOMEM;
 997                 }
 998
 999                 dmah->size = total;
1000                 dmah->vaddr = dma_alloc_coherent(dev->dev,
1001                                                  dmah->size,
1002                                                  &dmah->busaddr,
1003                                                  GFP_KERNEL);
1004                 if (!dmah->vaddr) {
1005                         kfree(dmah);
1006
1007                         /* Set count correctly so we free the proper amount. */
1008                         entry->buf_count = count;
1009                         entry->seg_count = count;
1010                         drm_cleanup_buf_error(dev, entry);
1011                         kfree(temp_pagelist);
1012                         mutex_unlock(&dev->struct_mutex);
1013                         atomic_dec(&dev->buf_alloc);
1014                         return -ENOMEM;
1015                 }
1016                 entry->seglist[entry->seg_count++] = dmah;
1017                 for (i = 0; i < (1 << page_order); i++) {
1018                         DRM_DEBUG("page %d @ 0x%08lx\n",
1019                                   dma->page_count + page_count,
1020                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
1021                         temp_pagelist[dma->page_count + page_count++]
1022                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
1023                 }
1024                 for (offset = 0;
1025                      offset + size <= total && entry->buf_count < count;
1026                      offset += alignment, ++entry->buf_count) {
1027                         buf = &entry->buflist[entry->buf_count];
1028                         buf->idx = dma->buf_count + entry->buf_count;
1029                         buf->total = alignment;
1030                         buf->order = order;
1031                         buf->used = 0;
1032                         buf->offset = (dma->byte_count + byte_count + offset);
1033                         buf->address = (void *)(dmah->vaddr + offset);
1034                         buf->bus_address = dmah->busaddr + offset;
1035                         buf->next = NULL;
1036                         buf->waiting = 0;
1037                         buf->pending = 0;
1038                         buf->file_priv = NULL;
1039
1040                         buf->dev_priv_size = dev->driver->dev_priv_size;
1041                         buf->dev_private = kzalloc(buf->dev_priv_size,
1042                                                 GFP_KERNEL);
1043                         if (!buf->dev_private) {
1044                                 /* Set count correctly so we free the proper amount. */
1045                                 entry->buf_count = count;
1046                                 entry->seg_count = count;
1047                                 drm_cleanup_buf_error(dev, entry);
1048                                 kfree(temp_pagelist);
1049                                 mutex_unlock(&dev->struct_mutex);
1050                                 atomic_dec(&dev->buf_alloc);
1051                                 return -ENOMEM;
1052                         }
1053
1054                         DRM_DEBUG("buffer %d @ %p\n",
1055                                   entry->buf_count, buf->address);
1056                 }
1057                 byte_count += PAGE_SIZE << page_order;
1058         }
1059
1060         temp_buflist = krealloc(dma->buflist,
1061                                 (dma->buf_count + entry->buf_count) *
1062                                 sizeof(*dma->buflist), GFP_KERNEL);
1063         if (!temp_buflist) {
1064                 /* Free the entry because it isn't valid */
1065                 drm_cleanup_buf_error(dev, entry);
1066                 kfree(temp_pagelist);
1067                 mutex_unlock(&dev->struct_mutex);
1068                 atomic_dec(&dev->buf_alloc);
1069                 return -ENOMEM;
1070         }
1071         dma->buflist = temp_buflist;
1072
1073         for (i = 0; i < entry->buf_count; i++) {
1074                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1075         }
1076
1077         /* No allocations failed, so now we can replace the original pagelist
1078          * with the new one.
1079          */
1080         if (dma->page_count) {
1081                 kfree(dma->pagelist);
1082         }
1083         dma->pagelist = temp_pagelist;
1084
1085         dma->buf_count += entry->buf_count;
1086         dma->seg_count += entry->seg_count;
1087         dma->page_count += entry->seg_count << page_order;
1088         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1089
1090         mutex_unlock(&dev->struct_mutex);
1091
1092         request->count = entry->buf_count;
1093         request->size = size;
1094
1095         if (request->flags & _DRM_PCI_BUFFER_RO)
1096                 dma->flags = _DRM_DMA_USE_PCI_RO;
1097
1098         atomic_dec(&dev->buf_alloc);
1099         return 0;
1100
1101 }
1102 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1103
1104 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1105                                  struct drm_buf_desc *request)
1106 {
1107         struct drm_device_dma *dma = dev->dma;
1108         struct drm_buf_entry *entry;
1109         struct drm_buf *buf;
1110         unsigned long offset;
1111         unsigned long agp_offset;
1112         int count;
1113         int order;
1114         int size;
1115         int alignment;
1116         int page_order;
1117         int total;
1118         int byte_count;
1119         int i;
1120         struct drm_buf **temp_buflist;
1121
1122         if (!drm_core_check_feature(dev, DRIVER_SG))
1123                 return -EOPNOTSUPP;
1124
1125         if (!dma)
1126                 return -EINVAL;
1127
1128         if (!capable(CAP_SYS_ADMIN))
1129                 return -EPERM;
1130
1131         count = request->count;
1132         order = order_base_2(request->size);
1133         size = 1 << order;
1134
1135         alignment = (request->flags & _DRM_PAGE_ALIGN)
1136             ? PAGE_ALIGN(size) : size;
1137         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1138         total = PAGE_SIZE << page_order;
1139
1140         byte_count = 0;
1141         agp_offset = request->agp_start;
1142
1143         DRM_DEBUG("count:      %d\n", count);
1144         DRM_DEBUG("order:      %d\n", order);
1145         DRM_DEBUG("size:       %d\n", size);
1146         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1147         DRM_DEBUG("alignment:  %d\n", alignment);
1148         DRM_DEBUG("page_order: %d\n", page_order);
1149         DRM_DEBUG("total:      %d\n", total);
1150
1151         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1152                 return -EINVAL;
1153
1154         spin_lock(&dev->buf_lock);
1155         if (dev->buf_use) {
1156                 spin_unlock(&dev->buf_lock);
1157                 return -EBUSY;
1158         }
1159         atomic_inc(&dev->buf_alloc);
1160         spin_unlock(&dev->buf_lock);
1161
1162         mutex_lock(&dev->struct_mutex);
1163         entry = &dma->bufs[order];
1164         if (entry->buf_count) {
1165                 mutex_unlock(&dev->struct_mutex);
1166                 atomic_dec(&dev->buf_alloc);
1167                 return -ENOMEM; /* May only call once for each order */
1168         }
1169
1170         if (count < 0 || count > 4096) {
1171                 mutex_unlock(&dev->struct_mutex);
1172                 atomic_dec(&dev->buf_alloc);
1173                 return -EINVAL;
1174         }
1175
1176         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1177         if (!entry->buflist) {
1178                 mutex_unlock(&dev->struct_mutex);
1179                 atomic_dec(&dev->buf_alloc);
1180                 return -ENOMEM;
1181         }
1182
1183         entry->buf_size = size;
1184         entry->page_order = page_order;
1185
1186         offset = 0;
1187
1188         while (entry->buf_count < count) {
1189                 buf = &entry->buflist[entry->buf_count];
1190                 buf->idx = dma->buf_count + entry->buf_count;
1191                 buf->total = alignment;
1192                 buf->order = order;
1193                 buf->used = 0;
1194
1195                 buf->offset = (dma->byte_count + offset);
1196                 buf->bus_address = agp_offset + offset;
1197                 buf->address = (void *)(agp_offset + offset
1198                                         + (unsigned long)dev->sg->virtual);
1199                 buf->next = NULL;
1200                 buf->waiting = 0;
1201                 buf->pending = 0;
1202                 buf->file_priv = NULL;
1203
1204                 buf->dev_priv_size = dev->driver->dev_priv_size;
1205                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1206                 if (!buf->dev_private) {
1207                         /* Set count correctly so we free the proper amount. */
1208                         entry->buf_count = count;
1209                         drm_cleanup_buf_error(dev, entry);
1210                         mutex_unlock(&dev->struct_mutex);
1211                         atomic_dec(&dev->buf_alloc);
1212                         return -ENOMEM;
1213                 }
1214
1215                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1216
1217                 offset += alignment;
1218                 entry->buf_count++;
1219                 byte_count += PAGE_SIZE << page_order;
1220         }
1221
1222         DRM_DEBUG("byte_count: %d\n", byte_count);
1223
1224         temp_buflist = krealloc(dma->buflist,
1225                                 (dma->buf_count + entry->buf_count) *
1226                                 sizeof(*dma->buflist), GFP_KERNEL);
1227         if (!temp_buflist) {
1228                 /* Free the entry because it isn't valid */
1229                 drm_cleanup_buf_error(dev, entry);
1230                 mutex_unlock(&dev->struct_mutex);
1231                 atomic_dec(&dev->buf_alloc);
1232                 return -ENOMEM;
1233         }
1234         dma->buflist = temp_buflist;
1235
1236         for (i = 0; i < entry->buf_count; i++) {
1237                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1238         }
1239
1240         dma->buf_count += entry->buf_count;
1241         dma->seg_count += entry->seg_count;
1242         dma->page_count += byte_count >> PAGE_SHIFT;
1243         dma->byte_count += byte_count;
1244
1245         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1246         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1247
1248         mutex_unlock(&dev->struct_mutex);
1249
1250         request->count = entry->buf_count;
1251         request->size = size;
1252
1253         dma->flags = _DRM_DMA_USE_SG;
1254
1255         atomic_dec(&dev->buf_alloc);
1256         return 0;
1257 }
1258
1259 /*
1260  * Add buffers for DMA transfers (ioctl).
1261  *
1262  * \param inode device inode.
1263  * \param file_priv DRM file private.
1264  * \param cmd command.
1265  * \param arg pointer to a struct drm_buf_desc request.
1266  * \return zero on success or a negative number on failure.
1267  *
1268  * According with the memory type specified in drm_buf_desc::flags and the
1269  * build options, it dispatches the call either to addbufs_agp(),
1270  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1271  * PCI memory respectively.
1272  */
1273 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1274                        struct drm_file *file_priv)
1275 {
1276         struct drm_buf_desc *request = data;
1277         int ret;
1278
1279         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1280                 return -EOPNOTSUPP;
1281
1282         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1283                 return -EOPNOTSUPP;
1284
1285 #if IS_ENABLED(CONFIG_AGP)
1286         if (request->flags & _DRM_AGP_BUFFER)
1287                 ret = drm_legacy_addbufs_agp(dev, request);
1288         else
1289 #endif
1290         if (request->flags & _DRM_SG_BUFFER)
1291                 ret = drm_legacy_addbufs_sg(dev, request);
1292         else if (request->flags & _DRM_FB_BUFFER)
1293                 ret = -EINVAL;
1294         else
1295                 ret = drm_legacy_addbufs_pci(dev, request);
1296
1297         return ret;
1298 }
1299
1300 /*
1301  * Get information about the buffer mappings.
1302  *
1303  * This was originally mean for debugging purposes, or by a sophisticated
1304  * client library to determine how best to use the available buffers (e.g.,
1305  * large buffers can be used for image transfer).
1306  *
1307  * \param inode device inode.
1308  * \param file_priv DRM file private.
1309  * \param cmd command.
1310  * \param arg pointer to a drm_buf_info structure.
1311  * \return zero on success or a negative number on failure.
1312  *
1313  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1314  * lock, preventing of allocating more buffers after this call. Information
1315  * about each requested buffer is then copied into user space.
1316  */
1317 int __drm_legacy_infobufs(struct drm_device *dev,
1318                         void *data, int *p,
1319                         int (*f)(void *, int, struct drm_buf_entry *))
1320 {
1321         struct drm_device_dma *dma = dev->dma;
1322         int i;
1323         int count;
1324
1325         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1326                 return -EOPNOTSUPP;
1327
1328         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1329                 return -EOPNOTSUPP;
1330
1331         if (!dma)
1332                 return -EINVAL;
1333
1334         spin_lock(&dev->buf_lock);
1335         if (atomic_read(&dev->buf_alloc)) {
1336                 spin_unlock(&dev->buf_lock);
1337                 return -EBUSY;
1338         }
1339         ++dev->buf_use;         /* Can't allocate more after this call */
1340         spin_unlock(&dev->buf_lock);
1341
1342         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1343                 if (dma->bufs[i].buf_count)
1344                         ++count;
1345         }
1346
1347         DRM_DEBUG("count = %d\n", count);
1348
1349         if (*p >= count) {
1350                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1351                         struct drm_buf_entry *from = &dma->bufs[i];
1352
1353                         if (from->buf_count) {
1354                                 if (f(data, count, from) < 0)
1355                                         return -EFAULT;
1356                                 DRM_DEBUG("%d %d %d %d %d\n",
1357                                           i,
1358                                           dma->bufs[i].buf_count,
1359                                           dma->bufs[i].buf_size,
1360                                           dma->bufs[i].low_mark,
1361                                           dma->bufs[i].high_mark);
1362                                 ++count;
1363                         }
1364                 }
1365         }
1366         *p = count;
1367
1368         return 0;
1369 }
1370
1371 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1372 {
1373         struct drm_buf_info *request = data;
1374         struct drm_buf_desc __user *to = &request->list[count];
1375         struct drm_buf_desc v = {.count = from->buf_count,
1376                                  .size = from->buf_size,
1377                                  .low_mark = from->low_mark,
1378                                  .high_mark = from->high_mark};
1379
1380         if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1381                 return -EFAULT;
1382         return 0;
1383 }
1384
1385 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1386                         struct drm_file *file_priv)
1387 {
1388         struct drm_buf_info *request = data;
1389
1390         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1391 }
1392
1393 /*
1394  * Specifies a low and high water mark for buffer allocation
1395  *
1396  * \param inode device inode.
1397  * \param file_priv DRM file private.
1398  * \param cmd command.
1399  * \param arg a pointer to a drm_buf_desc structure.
1400  * \return zero on success or a negative number on failure.
1401  *
1402  * Verifies that the size order is bounded between the admissible orders and
1403  * updates the respective drm_device_dma::bufs entry low and high water mark.
1404  *
1405  * \note This ioctl is deprecated and mostly never used.
1406  */
1407 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1408                         struct drm_file *file_priv)
1409 {
1410         struct drm_device_dma *dma = dev->dma;
1411         struct drm_buf_desc *request = data;
1412         int order;
1413         struct drm_buf_entry *entry;
1414
1415         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1416                 return -EOPNOTSUPP;
1417
1418         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1419                 return -EOPNOTSUPP;
1420
1421         if (!dma)
1422                 return -EINVAL;
1423
1424         DRM_DEBUG("%d, %d, %d\n",
1425                   request->size, request->low_mark, request->high_mark);
1426         order = order_base_2(request->size);
1427         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1428                 return -EINVAL;
1429         entry = &dma->bufs[order];
1430
1431         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1432                 return -EINVAL;
1433         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1434                 return -EINVAL;
1435
1436         entry->low_mark = request->low_mark;
1437         entry->high_mark = request->high_mark;
1438
1439         return 0;
1440 }
1441
1442 /*
1443  * Unreserve the buffers in list, previously reserved using drmDMA.
1444  *
1445  * \param inode device inode.
1446  * \param file_priv DRM file private.
1447  * \param cmd command.
1448  * \param arg pointer to a drm_buf_free structure.
1449  * \return zero on success or a negative number on failure.
1450  *
1451  * Calls free_buffer() for each used buffer.
1452  * This function is primarily used for debugging.
1453  */
1454 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1455                         struct drm_file *file_priv)
1456 {
1457         struct drm_device_dma *dma = dev->dma;
1458         struct drm_buf_free *request = data;
1459         int i;
1460         int idx;
1461         struct drm_buf *buf;
1462
1463         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1464                 return -EOPNOTSUPP;
1465
1466         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1467                 return -EOPNOTSUPP;
1468
1469         if (!dma)
1470                 return -EINVAL;
1471
1472         DRM_DEBUG("%d\n", request->count);
1473         for (i = 0; i < request->count; i++) {
1474                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1475                         return -EFAULT;
1476                 if (idx < 0 || idx >= dma->buf_count) {
1477                         DRM_ERROR("Index %d (of %d max)\n",
1478                                   idx, dma->buf_count - 1);
1479                         return -EINVAL;
1480                 }
1481                 idx = array_index_nospec(idx, dma->buf_count);
1482                 buf = dma->buflist[idx];
1483                 if (buf->file_priv != file_priv) {
1484                         DRM_ERROR("Process %d freeing buffer not owned\n",
1485                                   task_pid_nr(current));
1486                         return -EINVAL;
1487                 }
1488                 drm_legacy_free_buffer(dev, buf);
1489         }
1490
1491         return 0;
1492 }
1493
1494 /*
1495  * Maps all of the DMA buffers into client-virtual space (ioctl).
1496  *
1497  * \param inode device inode.
1498  * \param file_priv DRM file private.
1499  * \param cmd command.
1500  * \param arg pointer to a drm_buf_map structure.
1501  * \return zero on success or a negative number on failure.
1502  *
1503  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1504  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1505  * offset equal to 0, which drm_mmap() interprets as PCI buffers and calls
1506  * drm_mmap_dma().
1507  */
1508 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1509                          void __user **v,
1510                          int (*f)(void *, int, unsigned long,
1511                                  struct drm_buf *),
1512                                  struct drm_file *file_priv)
1513 {
1514         struct drm_device_dma *dma = dev->dma;
1515         int retcode = 0;
1516         unsigned long virtual;
1517         int i;
1518
1519         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1520                 return -EOPNOTSUPP;
1521
1522         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1523                 return -EOPNOTSUPP;
1524
1525         if (!dma)
1526                 return -EINVAL;
1527
1528         spin_lock(&dev->buf_lock);
1529         if (atomic_read(&dev->buf_alloc)) {
1530                 spin_unlock(&dev->buf_lock);
1531                 return -EBUSY;
1532         }
1533         dev->buf_use++;         /* Can't allocate more after this call */
1534         spin_unlock(&dev->buf_lock);
1535
1536         if (*p >= dma->buf_count) {
1537                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1538                     || (drm_core_check_feature(dev, DRIVER_SG)
1539                         && (dma->flags & _DRM_DMA_USE_SG))) {
1540                         struct drm_local_map *map = dev->agp_buffer_map;
1541                         unsigned long token = dev->agp_buffer_token;
1542
1543                         if (!map) {
1544                                 retcode = -EINVAL;
1545                                 goto done;
1546                         }
1547                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1548                                           PROT_READ | PROT_WRITE,
1549                                           MAP_SHARED,
1550                                           token);
1551                 } else {
1552                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1553                                           PROT_READ | PROT_WRITE,
1554                                           MAP_SHARED, 0);
1555                 }
1556                 if (virtual > -1024UL) {
1557                         /* Real error */
1558                         retcode = (signed long)virtual;
1559                         goto done;
1560                 }
1561                 *v = (void __user *)virtual;
1562
1563                 for (i = 0; i < dma->buf_count; i++) {
1564                         if (f(data, i, virtual, dma->buflist[i]) < 0) {
1565                                 retcode = -EFAULT;
1566                                 goto done;
1567                         }
1568                 }
1569         }
1570       done:
1571         *p = dma->buf_count;
1572         DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1573
1574         return retcode;
1575 }
1576
1577 static int map_one_buf(void *data, int idx, unsigned long virtual,
1578                         struct drm_buf *buf)
1579 {
1580         struct drm_buf_map *request = data;
1581         unsigned long address = virtual + buf->offset;  /* *** */
1582
1583         if (copy_to_user(&request->list[idx].idx, &buf->idx,
1584                          sizeof(request->list[0].idx)))
1585                 return -EFAULT;
1586         if (copy_to_user(&request->list[idx].total, &buf->total,
1587                          sizeof(request->list[0].total)))
1588                 return -EFAULT;
1589         if (clear_user(&request->list[idx].used, sizeof(int)))
1590                 return -EFAULT;
1591         if (copy_to_user(&request->list[idx].address, &address,
1592                          sizeof(address)))
1593                 return -EFAULT;
1594         return 0;
1595 }
1596
1597 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1598                        struct drm_file *file_priv)
1599 {
1600         struct drm_buf_map *request = data;
1601
1602         return __drm_legacy_mapbufs(dev, data, &request->count,
1603                                     &request->virtual, map_one_buf,
1604                                     file_priv);
1605 }
1606
1607 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1608                   struct drm_file *file_priv)
1609 {
1610         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1611                 return -EOPNOTSUPP;
1612
1613         if (dev->driver->dma_ioctl)
1614                 return dev->driver->dma_ioctl(dev, data, file_priv);
1615         else
1616                 return -EINVAL;
1617 }
1618
1619 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1620 {
1621         struct drm_map_list *entry;
1622
1623         list_for_each_entry(entry, &dev->maplist, head) {
1624                 if (entry->map && entry->map->type == _DRM_SHM &&
1625                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1626                         return entry->map;
1627                 }
1628         }
1629         return NULL;
1630 }
1631 EXPORT_SYMBOL(drm_legacy_getsarea);