drivers/gpu/drm/drm_bufs.c

   1 /*
   2  * Legacy: Generic DRM Buffer Management
   3  *
   4  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
   5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   6  * All Rights Reserved.
   7  *
   8  * Author: Rickard E. (Rik) Faith <faith@valinux.com>
   9  * Author: Gareth Hughes <gareth@valinux.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice (including the next
  19  * paragraph) shall be included in all copies or substantial portions of the
  20  * Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  26  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  27  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  28  * OTHER DEALINGS IN THE SOFTWARE.
  29  */
  30
  31 #include <linux/export.h>
  32 #include <linux/log2.h>
  33 #include <linux/mm.h>
  34 #include <linux/mman.h>
  35 #include <linux/nospec.h>
  36 #include <linux/pci.h>
  37 #include <linux/slab.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/vmalloc.h>
  40
  41 #include <asm/shmparam.h>
  42
  43 #include <drm/drm_agpsupport.h>
  44 #include <drm/drm_device.h>
  45 #include <drm/drm_drv.h>
  46 #include <drm/drm_file.h>
  47 #include <drm/drm_print.h>
  48
  49 #include "drm_legacy.h"
  50
  51
  52 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  53                                                   struct drm_local_map *map)
  54 {
  55         struct drm_map_list *entry;
  56
  57         list_for_each_entry(entry, &dev->maplist, head) {
  58                 /*
  59                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  60                  * while PCI resources may live above that, we only compare the
  61                  * lower 32 bits of the map offset for maps of type
  62                  * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  63                  * It is assumed that if a driver have more than one resource
  64                  * of each type, the lower 32 bits are different.
  65                  */
  66                 if (!entry->map ||
  67                     map->type != entry->map->type ||
  68                     entry->master != dev->master)
  69                         continue;
  70                 switch (map->type) {
  71                 case _DRM_SHM:
  72                         if (map->flags != _DRM_CONTAINS_LOCK)
  73                                 break;
  74                         return entry;
  75                 case _DRM_REGISTERS:
  76                 case _DRM_FRAME_BUFFER:
  77                         if ((entry->map->offset & 0xffffffff) ==
  78                             (map->offset & 0xffffffff))
  79                                 return entry;
  80                         break;
  81                 default: /* Make gcc happy */
  82                         break;
  83                 }
  84                 if (entry->map->offset == map->offset)
  85                         return entry;
  86         }
  87
  88         return NULL;
  89 }
  90
  91 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  92                           unsigned long user_token, int hashed_handle, int shm)
  93 {
  94         int use_hashed_handle, shift;
  95         unsigned long add;
  96
  97 #if (BITS_PER_LONG == 64)
  98         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  99 #elif (BITS_PER_LONG == 32)
 100         use_hashed_handle = hashed_handle;
 101 #else
 102 #error Unsupported long size. Neither 64 nor 32 bits.
 103 #endif
 104
 105         if (!use_hashed_handle) {
 106                 int ret;
 107
 108                 hash->key = user_token >> PAGE_SHIFT;
 109                 ret = drm_ht_insert_item(&dev->map_hash, hash);
 110                 if (ret != -EINVAL)
 111                         return ret;
 112         }
 113
 114         shift = 0;
 115         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 116         if (shm && (SHMLBA > PAGE_SIZE)) {
 117                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 118
 119                 /* For shared memory, we have to preserve the SHMLBA
 120                  * bits of the eventual vma->vm_pgoff value during
 121                  * mmap().  Otherwise we run into cache aliasing problems
 122                  * on some platforms.  On these platforms, the pgoff of
 123                  * a mmap() request is used to pick a suitable virtual
 124                  * address for the mmap() region such that it will not
 125                  * cause cache aliasing problems.
 126                  *
 127                  * Therefore, make sure the SHMLBA relevant bits of the
 128                  * hash value we use are equal to those in the original
 129                  * kernel virtual address.
 130                  */
 131                 shift = bits;
 132                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 133         }
 134
 135         return drm_ht_just_insert_please(&dev->map_hash, hash,
 136                                          user_token, 32 - PAGE_SHIFT - 3,
 137                                          shift, add);
 138 }
 139
 140 /*
 141  * Core function to create a range of memory available for mapping by a
 142  * non-root process.
 143  *
 144  * Adjusts the memory offset to its absolute value according to the mapping
 145  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 146  * applicable and if supported by the kernel.
 147  */
 148 static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
 149                            unsigned int size, enum drm_map_type type,
 150                            enum drm_map_flags flags,
 151                            struct drm_map_list **maplist)
 152 {
 153         struct drm_local_map *map;
 154         struct drm_map_list *list;
 155         unsigned long user_token;
 156         int ret;
 157
 158         map = kmalloc(sizeof(*map), GFP_KERNEL);
 159         if (!map)
 160                 return -ENOMEM;
 161
 162         map->offset = offset;
 163         map->size = size;
 164         map->flags = flags;
 165         map->type = type;
 166
 167         /* Only allow shared memory to be removable since we only keep enough
 168          * book keeping information about shared memory to allow for removal
 169          * when processes fork.
 170          */
 171         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 172                 kfree(map);
 173                 return -EINVAL;
 174         }
 175         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 176                   (unsigned long long)map->offset, map->size, map->type);
 177
 178         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 179          * hole created by that and it works around various broken drivers that use
 180          * a non-aligned quantity to map the SAREA. --BenH
 181          */
 182         if (map->type == _DRM_SHM)
 183                 map->size = PAGE_ALIGN(map->size);
 184
 185         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 186                 kfree(map);
 187                 return -EINVAL;
 188         }
 189         map->mtrr = -1;
 190         map->handle = NULL;
 191
 192         switch (map->type) {
 193         case _DRM_REGISTERS:
 194         case _DRM_FRAME_BUFFER:
 195 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 196                 if (map->offset + (map->size-1) < map->offset ||
 197                     map->offset < virt_to_phys(high_memory)) {
 198                         kfree(map);
 199                         return -EINVAL;
 200                 }
 201 #endif
 202                 /* Some drivers preinitialize some maps, without the X Server
 203                  * needing to be aware of it.  Therefore, we just return success
 204                  * when the server tries to create a duplicate map.
 205                  */
 206                 list = drm_find_matching_map(dev, map);
 207                 if (list != NULL) {
 208                         if (list->map->size != map->size) {
 209                                 DRM_DEBUG("Matching maps of type %d with "
 210                                           "mismatched sizes, (%ld vs %ld)\n",
 211                                           map->type, map->size,
 212                                           list->map->size);
 213                                 list->map->size = map->size;
 214                         }
 215
 216                         kfree(map);
 217                         *maplist = list;
 218                         return 0;
 219                 }
 220
 221                 if (map->type == _DRM_FRAME_BUFFER ||
 222                     (map->flags & _DRM_WRITE_COMBINING)) {
 223                         map->mtrr =
 224                                 arch_phys_wc_add(map->offset, map->size);
 225                 }
 226                 if (map->type == _DRM_REGISTERS) {
 227                         if (map->flags & _DRM_WRITE_COMBINING)
 228                                 map->handle = ioremap_wc(map->offset,
 229                                                          map->size);
 230                         else
 231                                 map->handle = ioremap(map->offset, map->size);
 232                         if (!map->handle) {
 233                                 kfree(map);
 234                                 return -ENOMEM;
 235                         }
 236                 }
 237
 238                 break;
 239         case _DRM_SHM:
 240                 list = drm_find_matching_map(dev, map);
 241                 if (list != NULL) {
 242                         if (list->map->size != map->size) {
 243                                 DRM_DEBUG("Matching maps of type %d with "
 244                                           "mismatched sizes, (%ld vs %ld)\n",
 245                                           map->type, map->size, list->map->size);
 246                                 list->map->size = map->size;
 247                         }
 248
 249                         kfree(map);
 250                         *maplist = list;
 251                         return 0;
 252                 }
 253                 map->handle = vmalloc_user(map->size);
 254                 DRM_DEBUG("%lu %d %p\n",
 255                           map->size, order_base_2(map->size), map->handle);
 256                 if (!map->handle) {
 257                         kfree(map);
 258                         return -ENOMEM;
 259                 }
 260                 map->offset = (unsigned long)map->handle;
 261                 if (map->flags & _DRM_CONTAINS_LOCK) {
 262                         /* Prevent a 2nd X Server from creating a 2nd lock */
 263                         if (dev->master->lock.hw_lock != NULL) {
 264                                 vfree(map->handle);
 265                                 kfree(map);
 266                                 return -EBUSY;
 267                         }
 268                         dev->sigdata.lock = dev->master->lock.hw_lock = map->handle;    /* Pointer to lock */
 269                 }
 270                 break;
 271         case _DRM_AGP: {
 272                 struct drm_agp_mem *entry;
 273                 int valid = 0;
 274
 275                 if (!dev->agp) {
 276                         kfree(map);
 277                         return -EINVAL;
 278                 }
 279 #ifdef __alpha__
 280                 map->offset += dev->hose->mem_space->start;
 281 #endif
 282                 /* In some cases (i810 driver), user space may have already
 283                  * added the AGP base itself, because dev->agp->base previously
 284                  * only got set during AGP enable.  So, only add the base
 285                  * address if the map's offset isn't already within the
 286                  * aperture.
 287                  */
 288                 if (map->offset < dev->agp->base ||
 289                     map->offset > dev->agp->base +
 290                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 291                         map->offset += dev->agp->base;
 292                 }
 293                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 294
 295                 /* This assumes the DRM is in total control of AGP space.
 296                  * It's not always the case as AGP can be in the control
 297                  * of user space (i.e. i810 driver). So this loop will get
 298                  * skipped and we double check that dev->agp->memory is
 299                  * actually set as well as being invalid before EPERM'ing
 300                  */
 301                 list_for_each_entry(entry, &dev->agp->memory, head) {
 302                         if ((map->offset >= entry->bound) &&
 303                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 304                                 valid = 1;
 305                                 break;
 306                         }
 307                 }
 308                 if (!list_empty(&dev->agp->memory) && !valid) {
 309                         kfree(map);
 310                         return -EPERM;
 311                 }
 312                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 313                           (unsigned long long)map->offset, map->size);
 314
 315                 break;
 316         }
 317         case _DRM_SCATTER_GATHER:
 318                 if (!dev->sg) {
 319                         kfree(map);
 320                         return -EINVAL;
 321                 }
 322                 map->offset += (unsigned long)dev->sg->virtual;
 323                 break;
 324         case _DRM_CONSISTENT:
 325                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 326                  * As we're limiting the address to 2^32-1 (or less),
 327                  * casting it down to 32 bits is no problem, but we
 328                  * need to point to a 64bit variable first.
 329                  */
 330                 map->handle = dma_alloc_coherent(dev->dev,
 331                                                  map->size,
 332                                                  &map->offset,
 333                                                  GFP_KERNEL);
 334                 if (!map->handle) {
 335                         kfree(map);
 336                         return -ENOMEM;
 337                 }
 338                 break;
 339         default:
 340                 kfree(map);
 341                 return -EINVAL;
 342         }
 343
 344         list = kzalloc(sizeof(*list), GFP_KERNEL);
 345         if (!list) {
 346                 if (map->type == _DRM_REGISTERS)
 347                         iounmap(map->handle);
 348                 kfree(map);
 349                 return -EINVAL;
 350         }
 351         list->map = map;
 352
 353         mutex_lock(&dev->struct_mutex);
 354         list_add(&list->head, &dev->maplist);
 355
 356         /* Assign a 32-bit handle */
 357         /* We do it here so that dev->struct_mutex protects the increment */
 358         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 359                 map->offset;
 360         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 361                              (map->type == _DRM_SHM));
 362         if (ret) {
 363                 if (map->type == _DRM_REGISTERS)
 364                         iounmap(map->handle);
 365                 kfree(map);
 366                 kfree(list);
 367                 mutex_unlock(&dev->struct_mutex);
 368                 return ret;
 369         }
 370
 371         list->user_token = list->hash.key << PAGE_SHIFT;
 372         mutex_unlock(&dev->struct_mutex);
 373
 374         if (!(map->flags & _DRM_DRIVER))
 375                 list->master = dev->master;
 376         *maplist = list;
 377         return 0;
 378 }
 379
 380 int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
 381                       unsigned int size, enum drm_map_type type,
 382                       enum drm_map_flags flags, struct drm_local_map **map_ptr)
 383 {
 384         struct drm_map_list *list;
 385         int rc;
 386
 387         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 388         if (!rc)
 389                 *map_ptr = list->map;
 390         return rc;
 391 }
 392 EXPORT_SYMBOL(drm_legacy_addmap);
 393
 394 struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
 395                                          unsigned int token)
 396 {
 397         struct drm_map_list *_entry;
 398
 399         list_for_each_entry(_entry, &dev->maplist, head)
 400                 if (_entry->user_token == token)
 401                         return _entry->map;
 402         return NULL;
 403 }
 404 EXPORT_SYMBOL(drm_legacy_findmap);
 405
 406 /*
 407  * Ioctl to specify a range of memory that is available for mapping by a
 408  * non-root process.
 409  *
 410  * \param inode device inode.
 411  * \param file_priv DRM file private.
 412  * \param cmd command.
 413  * \param arg pointer to a drm_map structure.
 414  * \return zero on success or a negative value on error.
 415  *
 416  */
 417 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
 418                             struct drm_file *file_priv)
 419 {
 420         struct drm_map *map = data;
 421         struct drm_map_list *maplist;
 422         int err;
 423
 424         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 425                 return -EPERM;
 426
 427         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 428             !drm_core_check_feature(dev, DRIVER_LEGACY))
 429                 return -EOPNOTSUPP;
 430
 431         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 432                               map->flags, &maplist);
 433
 434         if (err)
 435                 return err;
 436
 437         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 438         map->handle = (void *)(unsigned long)maplist->user_token;
 439
 440         /*
 441          * It appears that there are no users of this value whatsoever --
 442          * drmAddMap just discards it.  Let's not encourage its use.
 443          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 444          *  it's not a real mtrr index anymore.)
 445          */
 446         map->mtrr = -1;
 447
 448         return 0;
 449 }
 450
 451 /*
 452  * Get a mapping information.
 453  *
 454  * \param inode device inode.
 455  * \param file_priv DRM file private.
 456  * \param cmd command.
 457  * \param arg user argument, pointing to a drm_map structure.
 458  *
 459  * \return zero on success or a negative number on failure.
 460  *
 461  * Searches for the mapping with the specified offset and copies its information
 462  * into userspace
 463  */
 464 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
 465                             struct drm_file *file_priv)
 466 {
 467         struct drm_map *map = data;
 468         struct drm_map_list *r_list = NULL;
 469         struct list_head *list;
 470         int idx;
 471         int i;
 472
 473         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 474             !drm_core_check_feature(dev, DRIVER_LEGACY))
 475                 return -EOPNOTSUPP;
 476
 477         idx = map->offset;
 478         if (idx < 0)
 479                 return -EINVAL;
 480
 481         i = 0;
 482         mutex_lock(&dev->struct_mutex);
 483         list_for_each(list, &dev->maplist) {
 484                 if (i == idx) {
 485                         r_list = list_entry(list, struct drm_map_list, head);
 486                         break;
 487                 }
 488                 i++;
 489         }
 490         if (!r_list || !r_list->map) {
 491                 mutex_unlock(&dev->struct_mutex);
 492                 return -EINVAL;
 493         }
 494
 495         map->offset = r_list->map->offset;
 496         map->size = r_list->map->size;
 497         map->type = r_list->map->type;
 498         map->flags = r_list->map->flags;
 499         map->handle = (void *)(unsigned long) r_list->user_token;
 500         map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
 501
 502         mutex_unlock(&dev->struct_mutex);
 503
 504         return 0;
 505 }
 506
 507 /*
 508  * Remove a map private from list and deallocate resources if the mapping
 509  * isn't in use.
 510  *
 511  * Searches the map on drm_device::maplist, removes it from the list, see if
 512  * it's being used, and free any associated resource (such as MTRR's) if it's not
 513  * being on use.
 514  *
 515  * \sa drm_legacy_addmap
 516  */
 517 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 518 {
 519         struct drm_map_list *r_list = NULL, *list_t;
 520         int found = 0;
 521         struct drm_master *master;
 522
 523         /* Find the list entry for the map and remove it */
 524         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 525                 if (r_list->map == map) {
 526                         master = r_list->master;
 527                         list_del(&r_list->head);
 528                         drm_ht_remove_key(&dev->map_hash,
 529                                           r_list->user_token >> PAGE_SHIFT);
 530                         kfree(r_list);
 531                         found = 1;
 532                         break;
 533                 }
 534         }
 535
 536         if (!found)
 537                 return -EINVAL;
 538
 539         switch (map->type) {
 540         case _DRM_REGISTERS:
 541                 iounmap(map->handle);
 542                 fallthrough;
 543         case _DRM_FRAME_BUFFER:
 544                 arch_phys_wc_del(map->mtrr);
 545                 break;
 546         case _DRM_SHM:
 547                 vfree(map->handle);
 548                 if (master) {
 549                         if (dev->sigdata.lock == master->lock.hw_lock)
 550                                 dev->sigdata.lock = NULL;
 551                         master->lock.hw_lock = NULL;   /* SHM removed */
 552                         master->lock.file_priv = NULL;
 553                         wake_up_interruptible_all(&master->lock.lock_queue);
 554                 }
 555                 break;
 556         case _DRM_AGP:
 557         case _DRM_SCATTER_GATHER:
 558                 break;
 559         case _DRM_CONSISTENT:
 560                 dma_free_coherent(dev->dev,
 561                                   map->size,
 562                                   map->handle,
 563                                   map->offset);
 564                 break;
 565         }
 566         kfree(map);
 567
 568         return 0;
 569 }
 570 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
 571
 572 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
 573 {
 574         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 575             !drm_core_check_feature(dev, DRIVER_LEGACY))
 576                 return;
 577
 578         mutex_lock(&dev->struct_mutex);
 579         drm_legacy_rmmap_locked(dev, map);
 580         mutex_unlock(&dev->struct_mutex);
 581 }
 582 EXPORT_SYMBOL(drm_legacy_rmmap);
 583
 584 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
 585 {
 586         struct drm_map_list *r_list, *list_temp;
 587
 588         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 589                 return;
 590
 591         mutex_lock(&dev->struct_mutex);
 592         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 593                 if (r_list->master == master) {
 594                         drm_legacy_rmmap_locked(dev, r_list->map);
 595                         r_list = NULL;
 596                 }
 597         }
 598         mutex_unlock(&dev->struct_mutex);
 599 }
 600
 601 void drm_legacy_rmmaps(struct drm_device *dev)
 602 {
 603         struct drm_map_list *r_list, *list_temp;
 604
 605         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
 606                 drm_legacy_rmmap(dev, r_list->map);
 607 }
 608
 609 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 610  * the last close of the device, and this is necessary for cleanup when things
 611  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 612  * like a pointless exercise since they're going away anyway.
 613  *
 614  * One use case might be after addmap is allowed for normal users for SHM and
 615  * gets used by drivers that the server doesn't need to care about.  This seems
 616  * unlikely.
 617  *
 618  * \param inode device inode.
 619  * \param file_priv DRM file private.
 620  * \param cmd command.
 621  * \param arg pointer to a struct drm_map structure.
 622  * \return zero on success or a negative value on error.
 623  */
 624 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
 625                            struct drm_file *file_priv)
 626 {
 627         struct drm_map *request = data;
 628         struct drm_local_map *map = NULL;
 629         struct drm_map_list *r_list;
 630         int ret;
 631
 632         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 633             !drm_core_check_feature(dev, DRIVER_LEGACY))
 634                 return -EOPNOTSUPP;
 635
 636         mutex_lock(&dev->struct_mutex);
 637         list_for_each_entry(r_list, &dev->maplist, head) {
 638                 if (r_list->map &&
 639                     r_list->user_token == (unsigned long)request->handle &&
 640                     r_list->map->flags & _DRM_REMOVABLE) {
 641                         map = r_list->map;
 642                         break;
 643                 }
 644         }
 645
 646         /* List has wrapped around to the head pointer, or it's empty we didn't
 647          * find anything.
 648          */
 649         if (list_empty(&dev->maplist) || !map) {
 650                 mutex_unlock(&dev->struct_mutex);
 651                 return -EINVAL;
 652         }
 653
 654         /* Register and framebuffer maps are permanent */
 655         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 656                 mutex_unlock(&dev->struct_mutex);
 657                 return 0;
 658         }
 659
 660         ret = drm_legacy_rmmap_locked(dev, map);
 661
 662         mutex_unlock(&dev->struct_mutex);
 663
 664         return ret;
 665 }
 666
 667 /*
 668  * Cleanup after an error on one of the addbufs() functions.
 669  *
 670  * \param dev DRM device.
 671  * \param entry buffer entry where the error occurred.
 672  *
 673  * Frees any pages and buffers associated with the given entry.
 674  */
 675 static void drm_cleanup_buf_error(struct drm_device *dev,
 676                                   struct drm_buf_entry *entry)
 677 {
 678         drm_dma_handle_t *dmah;
 679         int i;
 680
 681         if (entry->seg_count) {
 682                 for (i = 0; i < entry->seg_count; i++) {
 683                         if (entry->seglist[i]) {
 684                                 dmah = entry->seglist[i];
 685                                 dma_free_coherent(dev->dev,
 686                                                   dmah->size,
 687                                                   dmah->vaddr,
 688                                                   dmah->busaddr);
 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                         return -ENOMEM;
 990
 991                 dmah->size = total;
 992                 dmah->vaddr = dma_alloc_coherent(dev->dev,
 993                                                  dmah->size,
 994                                                  &dmah->busaddr,
 995                                                  GFP_KERNEL);
 996                 if (!dmah->vaddr) {
 997                         kfree(dmah);
 998
 999                         /* Set count correctly so we free the proper amount. */
1000                         entry->buf_count = count;
1001                         entry->seg_count = count;
1002                         drm_cleanup_buf_error(dev, entry);
1003                         kfree(temp_pagelist);
1004                         mutex_unlock(&dev->struct_mutex);
1005                         atomic_dec(&dev->buf_alloc);
1006                         return -ENOMEM;
1007                 }
1008                 entry->seglist[entry->seg_count++] = dmah;
1009                 for (i = 0; i < (1 << page_order); i++) {
1010                         DRM_DEBUG("page %d @ 0x%08lx\n",
1011                                   dma->page_count + page_count,
1012                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
1013                         temp_pagelist[dma->page_count + page_count++]
1014                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
1015                 }
1016                 for (offset = 0;
1017                      offset + size <= total && entry->buf_count < count;
1018                      offset += alignment, ++entry->buf_count) {
1019                         buf = &entry->buflist[entry->buf_count];
1020                         buf->idx = dma->buf_count + entry->buf_count;
1021                         buf->total = alignment;
1022                         buf->order = order;
1023                         buf->used = 0;
1024                         buf->offset = (dma->byte_count + byte_count + offset);
1025                         buf->address = (void *)(dmah->vaddr + offset);
1026                         buf->bus_address = dmah->busaddr + offset;
1027                         buf->next = NULL;
1028                         buf->waiting = 0;
1029                         buf->pending = 0;
1030                         buf->file_priv = NULL;
1031
1032                         buf->dev_priv_size = dev->driver->dev_priv_size;
1033                         buf->dev_private = kzalloc(buf->dev_priv_size,
1034                                                 GFP_KERNEL);
1035                         if (!buf->dev_private) {
1036                                 /* Set count correctly so we free the proper amount. */
1037                                 entry->buf_count = count;
1038                                 entry->seg_count = count;
1039                                 drm_cleanup_buf_error(dev, entry);
1040                                 kfree(temp_pagelist);
1041                                 mutex_unlock(&dev->struct_mutex);
1042                                 atomic_dec(&dev->buf_alloc);
1043                                 return -ENOMEM;
1044                         }
1045
1046                         DRM_DEBUG("buffer %d @ %p\n",
1047                                   entry->buf_count, buf->address);
1048                 }
1049                 byte_count += PAGE_SIZE << page_order;
1050         }
1051
1052         temp_buflist = krealloc(dma->buflist,
1053                                 (dma->buf_count + entry->buf_count) *
1054                                 sizeof(*dma->buflist), GFP_KERNEL);
1055         if (!temp_buflist) {
1056                 /* Free the entry because it isn't valid */
1057                 drm_cleanup_buf_error(dev, entry);
1058                 kfree(temp_pagelist);
1059                 mutex_unlock(&dev->struct_mutex);
1060                 atomic_dec(&dev->buf_alloc);
1061                 return -ENOMEM;
1062         }
1063         dma->buflist = temp_buflist;
1064
1065         for (i = 0; i < entry->buf_count; i++) {
1066                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1067         }
1068
1069         /* No allocations failed, so now we can replace the original pagelist
1070          * with the new one.
1071          */
1072         if (dma->page_count) {
1073                 kfree(dma->pagelist);
1074         }
1075         dma->pagelist = temp_pagelist;
1076
1077         dma->buf_count += entry->buf_count;
1078         dma->seg_count += entry->seg_count;
1079         dma->page_count += entry->seg_count << page_order;
1080         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1081
1082         mutex_unlock(&dev->struct_mutex);
1083
1084         request->count = entry->buf_count;
1085         request->size = size;
1086
1087         if (request->flags & _DRM_PCI_BUFFER_RO)
1088                 dma->flags = _DRM_DMA_USE_PCI_RO;
1089
1090         atomic_dec(&dev->buf_alloc);
1091         return 0;
1092
1093 }
1094 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1095
1096 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1097                                  struct drm_buf_desc *request)
1098 {
1099         struct drm_device_dma *dma = dev->dma;
1100         struct drm_buf_entry *entry;
1101         struct drm_buf *buf;
1102         unsigned long offset;
1103         unsigned long agp_offset;
1104         int count;
1105         int order;
1106         int size;
1107         int alignment;
1108         int page_order;
1109         int total;
1110         int byte_count;
1111         int i;
1112         struct drm_buf **temp_buflist;
1113
1114         if (!drm_core_check_feature(dev, DRIVER_SG))
1115                 return -EOPNOTSUPP;
1116
1117         if (!dma)
1118                 return -EINVAL;
1119
1120         if (!capable(CAP_SYS_ADMIN))
1121                 return -EPERM;
1122
1123         count = request->count;
1124         order = order_base_2(request->size);
1125         size = 1 << order;
1126
1127         alignment = (request->flags & _DRM_PAGE_ALIGN)
1128             ? PAGE_ALIGN(size) : size;
1129         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1130         total = PAGE_SIZE << page_order;
1131
1132         byte_count = 0;
1133         agp_offset = request->agp_start;
1134
1135         DRM_DEBUG("count:      %d\n", count);
1136         DRM_DEBUG("order:      %d\n", order);
1137         DRM_DEBUG("size:       %d\n", size);
1138         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1139         DRM_DEBUG("alignment:  %d\n", alignment);
1140         DRM_DEBUG("page_order: %d\n", page_order);
1141         DRM_DEBUG("total:      %d\n", total);
1142
1143         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1144                 return -EINVAL;
1145
1146         spin_lock(&dev->buf_lock);
1147         if (dev->buf_use) {
1148                 spin_unlock(&dev->buf_lock);
1149                 return -EBUSY;
1150         }
1151         atomic_inc(&dev->buf_alloc);
1152         spin_unlock(&dev->buf_lock);
1153
1154         mutex_lock(&dev->struct_mutex);
1155         entry = &dma->bufs[order];
1156         if (entry->buf_count) {
1157                 mutex_unlock(&dev->struct_mutex);
1158                 atomic_dec(&dev->buf_alloc);
1159                 return -ENOMEM; /* May only call once for each order */
1160         }
1161
1162         if (count < 0 || count > 4096) {
1163                 mutex_unlock(&dev->struct_mutex);
1164                 atomic_dec(&dev->buf_alloc);
1165                 return -EINVAL;
1166         }
1167
1168         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1169         if (!entry->buflist) {
1170                 mutex_unlock(&dev->struct_mutex);
1171                 atomic_dec(&dev->buf_alloc);
1172                 return -ENOMEM;
1173         }
1174
1175         entry->buf_size = size;
1176         entry->page_order = page_order;
1177
1178         offset = 0;
1179
1180         while (entry->buf_count < count) {
1181                 buf = &entry->buflist[entry->buf_count];
1182                 buf->idx = dma->buf_count + entry->buf_count;
1183                 buf->total = alignment;
1184                 buf->order = order;
1185                 buf->used = 0;
1186
1187                 buf->offset = (dma->byte_count + offset);
1188                 buf->bus_address = agp_offset + offset;
1189                 buf->address = (void *)(agp_offset + offset
1190                                         + (unsigned long)dev->sg->virtual);
1191                 buf->next = NULL;
1192                 buf->waiting = 0;
1193                 buf->pending = 0;
1194                 buf->file_priv = NULL;
1195
1196                 buf->dev_priv_size = dev->driver->dev_priv_size;
1197                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1198                 if (!buf->dev_private) {
1199                         /* Set count correctly so we free the proper amount. */
1200                         entry->buf_count = count;
1201                         drm_cleanup_buf_error(dev, entry);
1202                         mutex_unlock(&dev->struct_mutex);
1203                         atomic_dec(&dev->buf_alloc);
1204                         return -ENOMEM;
1205                 }
1206
1207                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1208
1209                 offset += alignment;
1210                 entry->buf_count++;
1211                 byte_count += PAGE_SIZE << page_order;
1212         }
1213
1214         DRM_DEBUG("byte_count: %d\n", byte_count);
1215
1216         temp_buflist = krealloc(dma->buflist,
1217                                 (dma->buf_count + entry->buf_count) *
1218                                 sizeof(*dma->buflist), GFP_KERNEL);
1219         if (!temp_buflist) {
1220                 /* Free the entry because it isn't valid */
1221                 drm_cleanup_buf_error(dev, entry);
1222                 mutex_unlock(&dev->struct_mutex);
1223                 atomic_dec(&dev->buf_alloc);
1224                 return -ENOMEM;
1225         }
1226         dma->buflist = temp_buflist;
1227
1228         for (i = 0; i < entry->buf_count; i++) {
1229                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1230         }
1231
1232         dma->buf_count += entry->buf_count;
1233         dma->seg_count += entry->seg_count;
1234         dma->page_count += byte_count >> PAGE_SHIFT;
1235         dma->byte_count += byte_count;
1236
1237         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1238         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1239
1240         mutex_unlock(&dev->struct_mutex);
1241
1242         request->count = entry->buf_count;
1243         request->size = size;
1244
1245         dma->flags = _DRM_DMA_USE_SG;
1246
1247         atomic_dec(&dev->buf_alloc);
1248         return 0;
1249 }
1250
1251 /*
1252  * Add buffers for DMA transfers (ioctl).
1253  *
1254  * \param inode device inode.
1255  * \param file_priv DRM file private.
1256  * \param cmd command.
1257  * \param arg pointer to a struct drm_buf_desc request.
1258  * \return zero on success or a negative number on failure.
1259  *
1260  * According with the memory type specified in drm_buf_desc::flags and the
1261  * build options, it dispatches the call either to addbufs_agp(),
1262  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1263  * PCI memory respectively.
1264  */
1265 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1266                        struct drm_file *file_priv)
1267 {
1268         struct drm_buf_desc *request = data;
1269         int ret;
1270
1271         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1272                 return -EOPNOTSUPP;
1273
1274         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1275                 return -EOPNOTSUPP;
1276
1277 #if IS_ENABLED(CONFIG_AGP)
1278         if (request->flags & _DRM_AGP_BUFFER)
1279                 ret = drm_legacy_addbufs_agp(dev, request);
1280         else
1281 #endif
1282         if (request->flags & _DRM_SG_BUFFER)
1283                 ret = drm_legacy_addbufs_sg(dev, request);
1284         else if (request->flags & _DRM_FB_BUFFER)
1285                 ret = -EINVAL;
1286         else
1287                 ret = drm_legacy_addbufs_pci(dev, request);
1288
1289         return ret;
1290 }
1291
1292 /*
1293  * Get information about the buffer mappings.
1294  *
1295  * This was originally mean for debugging purposes, or by a sophisticated
1296  * client library to determine how best to use the available buffers (e.g.,
1297  * large buffers can be used for image transfer).
1298  *
1299  * \param inode device inode.
1300  * \param file_priv DRM file private.
1301  * \param cmd command.
1302  * \param arg pointer to a drm_buf_info structure.
1303  * \return zero on success or a negative number on failure.
1304  *
1305  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1306  * lock, preventing of allocating more buffers after this call. Information
1307  * about each requested buffer is then copied into user space.
1308  */
1309 int __drm_legacy_infobufs(struct drm_device *dev,
1310                         void *data, int *p,
1311                         int (*f)(void *, int, struct drm_buf_entry *))
1312 {
1313         struct drm_device_dma *dma = dev->dma;
1314         int i;
1315         int count;
1316
1317         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1318                 return -EOPNOTSUPP;
1319
1320         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1321                 return -EOPNOTSUPP;
1322
1323         if (!dma)
1324                 return -EINVAL;
1325
1326         spin_lock(&dev->buf_lock);
1327         if (atomic_read(&dev->buf_alloc)) {
1328                 spin_unlock(&dev->buf_lock);
1329                 return -EBUSY;
1330         }
1331         ++dev->buf_use;         /* Can't allocate more after this call */
1332         spin_unlock(&dev->buf_lock);
1333
1334         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1335                 if (dma->bufs[i].buf_count)
1336                         ++count;
1337         }
1338
1339         DRM_DEBUG("count = %d\n", count);
1340
1341         if (*p >= count) {
1342                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1343                         struct drm_buf_entry *from = &dma->bufs[i];
1344
1345                         if (from->buf_count) {
1346                                 if (f(data, count, from) < 0)
1347                                         return -EFAULT;
1348                                 DRM_DEBUG("%d %d %d %d %d\n",
1349                                           i,
1350                                           dma->bufs[i].buf_count,
1351                                           dma->bufs[i].buf_size,
1352                                           dma->bufs[i].low_mark,
1353                                           dma->bufs[i].high_mark);
1354                                 ++count;
1355                         }
1356                 }
1357         }
1358         *p = count;
1359
1360         return 0;
1361 }
1362
1363 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1364 {
1365         struct drm_buf_info *request = data;
1366         struct drm_buf_desc __user *to = &request->list[count];
1367         struct drm_buf_desc v = {.count = from->buf_count,
1368                                  .size = from->buf_size,
1369                                  .low_mark = from->low_mark,
1370                                  .high_mark = from->high_mark};
1371
1372         if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1373                 return -EFAULT;
1374         return 0;
1375 }
1376
1377 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1378                         struct drm_file *file_priv)
1379 {
1380         struct drm_buf_info *request = data;
1381
1382         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1383 }
1384
1385 /*
1386  * Specifies a low and high water mark for buffer allocation
1387  *
1388  * \param inode device inode.
1389  * \param file_priv DRM file private.
1390  * \param cmd command.
1391  * \param arg a pointer to a drm_buf_desc structure.
1392  * \return zero on success or a negative number on failure.
1393  *
1394  * Verifies that the size order is bounded between the admissible orders and
1395  * updates the respective drm_device_dma::bufs entry low and high water mark.
1396  *
1397  * \note This ioctl is deprecated and mostly never used.
1398  */
1399 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1400                         struct drm_file *file_priv)
1401 {
1402         struct drm_device_dma *dma = dev->dma;
1403         struct drm_buf_desc *request = data;
1404         int order;
1405         struct drm_buf_entry *entry;
1406
1407         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1408                 return -EOPNOTSUPP;
1409
1410         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1411                 return -EOPNOTSUPP;
1412
1413         if (!dma)
1414                 return -EINVAL;
1415
1416         DRM_DEBUG("%d, %d, %d\n",
1417                   request->size, request->low_mark, request->high_mark);
1418         order = order_base_2(request->size);
1419         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1420                 return -EINVAL;
1421         entry = &dma->bufs[order];
1422
1423         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1424                 return -EINVAL;
1425         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1426                 return -EINVAL;
1427
1428         entry->low_mark = request->low_mark;
1429         entry->high_mark = request->high_mark;
1430
1431         return 0;
1432 }
1433
1434 /*
1435  * Unreserve the buffers in list, previously reserved using drmDMA.
1436  *
1437  * \param inode device inode.
1438  * \param file_priv DRM file private.
1439  * \param cmd command.
1440  * \param arg pointer to a drm_buf_free structure.
1441  * \return zero on success or a negative number on failure.
1442  *
1443  * Calls free_buffer() for each used buffer.
1444  * This function is primarily used for debugging.
1445  */
1446 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1447                         struct drm_file *file_priv)
1448 {
1449         struct drm_device_dma *dma = dev->dma;
1450         struct drm_buf_free *request = data;
1451         int i;
1452         int idx;
1453         struct drm_buf *buf;
1454
1455         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1456                 return -EOPNOTSUPP;
1457
1458         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1459                 return -EOPNOTSUPP;
1460
1461         if (!dma)
1462                 return -EINVAL;
1463
1464         DRM_DEBUG("%d\n", request->count);
1465         for (i = 0; i < request->count; i++) {
1466                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1467                         return -EFAULT;
1468                 if (idx < 0 || idx >= dma->buf_count) {
1469                         DRM_ERROR("Index %d (of %d max)\n",
1470                                   idx, dma->buf_count - 1);
1471                         return -EINVAL;
1472                 }
1473                 idx = array_index_nospec(idx, dma->buf_count);
1474                 buf = dma->buflist[idx];
1475                 if (buf->file_priv != file_priv) {
1476                         DRM_ERROR("Process %d freeing buffer not owned\n",
1477                                   task_pid_nr(current));
1478                         return -EINVAL;
1479                 }
1480                 drm_legacy_free_buffer(dev, buf);
1481         }
1482
1483         return 0;
1484 }
1485
1486 /*
1487  * Maps all of the DMA buffers into client-virtual space (ioctl).
1488  *
1489  * \param inode device inode.
1490  * \param file_priv DRM file private.
1491  * \param cmd command.
1492  * \param arg pointer to a drm_buf_map structure.
1493  * \return zero on success or a negative number on failure.
1494  *
1495  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1496  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1497  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1498  * drm_mmap_dma().
1499  */
1500 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1501                          void __user **v,
1502                          int (*f)(void *, int, unsigned long,
1503                                  struct drm_buf *),
1504                                  struct drm_file *file_priv)
1505 {
1506         struct drm_device_dma *dma = dev->dma;
1507         int retcode = 0;
1508         unsigned long virtual;
1509         int i;
1510
1511         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1512                 return -EOPNOTSUPP;
1513
1514         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1515                 return -EOPNOTSUPP;
1516
1517         if (!dma)
1518                 return -EINVAL;
1519
1520         spin_lock(&dev->buf_lock);
1521         if (atomic_read(&dev->buf_alloc)) {
1522                 spin_unlock(&dev->buf_lock);
1523                 return -EBUSY;
1524         }
1525         dev->buf_use++;         /* Can't allocate more after this call */
1526         spin_unlock(&dev->buf_lock);
1527
1528         if (*p >= dma->buf_count) {
1529                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1530                     || (drm_core_check_feature(dev, DRIVER_SG)
1531                         && (dma->flags & _DRM_DMA_USE_SG))) {
1532                         struct drm_local_map *map = dev->agp_buffer_map;
1533                         unsigned long token = dev->agp_buffer_token;
1534
1535                         if (!map) {
1536                                 retcode = -EINVAL;
1537                                 goto done;
1538                         }
1539                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1540                                           PROT_READ | PROT_WRITE,
1541                                           MAP_SHARED,
1542                                           token);
1543                 } else {
1544                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1545                                           PROT_READ | PROT_WRITE,
1546                                           MAP_SHARED, 0);
1547                 }
1548                 if (virtual > -1024UL) {
1549                         /* Real error */
1550                         retcode = (signed long)virtual;
1551                         goto done;
1552                 }
1553                 *v = (void __user *)virtual;
1554
1555                 for (i = 0; i < dma->buf_count; i++) {
1556                         if (f(data, i, virtual, dma->buflist[i]) < 0) {
1557                                 retcode = -EFAULT;
1558                                 goto done;
1559                         }
1560                 }
1561         }
1562       done:
1563         *p = dma->buf_count;
1564         DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1565
1566         return retcode;
1567 }
1568
1569 static int map_one_buf(void *data, int idx, unsigned long virtual,
1570                         struct drm_buf *buf)
1571 {
1572         struct drm_buf_map *request = data;
1573         unsigned long address = virtual + buf->offset;  /* *** */
1574
1575         if (copy_to_user(&request->list[idx].idx, &buf->idx,
1576                          sizeof(request->list[0].idx)))
1577                 return -EFAULT;
1578         if (copy_to_user(&request->list[idx].total, &buf->total,
1579                          sizeof(request->list[0].total)))
1580                 return -EFAULT;
1581         if (clear_user(&request->list[idx].used, sizeof(int)))
1582                 return -EFAULT;
1583         if (copy_to_user(&request->list[idx].address, &address,
1584                          sizeof(address)))
1585                 return -EFAULT;
1586         return 0;
1587 }
1588
1589 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1590                        struct drm_file *file_priv)
1591 {
1592         struct drm_buf_map *request = data;
1593
1594         return __drm_legacy_mapbufs(dev, data, &request->count,
1595                                     &request->virtual, map_one_buf,
1596                                     file_priv);
1597 }
1598
1599 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1600                   struct drm_file *file_priv)
1601 {
1602         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1603                 return -EOPNOTSUPP;
1604
1605         if (dev->driver->dma_ioctl)
1606                 return dev->driver->dma_ioctl(dev, data, file_priv);
1607         else
1608                 return -EINVAL;
1609 }
1610
1611 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1612 {
1613         struct drm_map_list *entry;
1614
1615         list_for_each_entry(entry, &dev->maplist, head) {
1616                 if (entry->map && entry->map->type == _DRM_SHM &&
1617                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1618                         return entry->map;
1619                 }
1620         }
1621         return NULL;
1622 }
1623 EXPORT_SYMBOL(drm_legacy_getsarea);