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_LEGACY))
 427                 return -EOPNOTSUPP;
 428
 429         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 430                               map->flags, &maplist);
 431
 432         if (err)
 433                 return err;
 434
 435         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 436         map->handle = (void *)(unsigned long)maplist->user_token;
 437
 438         /*
 439          * It appears that there are no users of this value whatsoever --
 440          * drmAddMap just discards it.  Let's not encourage its use.
 441          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 442          *  it's not a real mtrr index anymore.)
 443          */
 444         map->mtrr = -1;
 445
 446         return 0;
 447 }
 448
 449 /*
 450  * Get a mapping information.
 451  *
 452  * \param inode device inode.
 453  * \param file_priv DRM file private.
 454  * \param cmd command.
 455  * \param arg user argument, pointing to a drm_map structure.
 456  *
 457  * \return zero on success or a negative number on failure.
 458  *
 459  * Searches for the mapping with the specified offset and copies its information
 460  * into userspace
 461  */
 462 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
 463                             struct drm_file *file_priv)
 464 {
 465         struct drm_map *map = data;
 466         struct drm_map_list *r_list = NULL;
 467         struct list_head *list;
 468         int idx;
 469         int i;
 470
 471         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 472                 return -EOPNOTSUPP;
 473
 474         idx = map->offset;
 475         if (idx < 0)
 476                 return -EINVAL;
 477
 478         i = 0;
 479         mutex_lock(&dev->struct_mutex);
 480         list_for_each(list, &dev->maplist) {
 481                 if (i == idx) {
 482                         r_list = list_entry(list, struct drm_map_list, head);
 483                         break;
 484                 }
 485                 i++;
 486         }
 487         if (!r_list || !r_list->map) {
 488                 mutex_unlock(&dev->struct_mutex);
 489                 return -EINVAL;
 490         }
 491
 492         map->offset = r_list->map->offset;
 493         map->size = r_list->map->size;
 494         map->type = r_list->map->type;
 495         map->flags = r_list->map->flags;
 496         map->handle = (void *)(unsigned long) r_list->user_token;
 497         map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
 498
 499         mutex_unlock(&dev->struct_mutex);
 500
 501         return 0;
 502 }
 503
 504 /*
 505  * Remove a map private from list and deallocate resources if the mapping
 506  * isn't in use.
 507  *
 508  * Searches the map on drm_device::maplist, removes it from the list, see if
 509  * it's being used, and free any associated resource (such as MTRR's) if it's not
 510  * being on use.
 511  *
 512  * \sa drm_legacy_addmap
 513  */
 514 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 515 {
 516         struct drm_map_list *r_list = NULL, *list_t;
 517         int found = 0;
 518         struct drm_master *master;
 519
 520         /* Find the list entry for the map and remove it */
 521         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 522                 if (r_list->map == map) {
 523                         master = r_list->master;
 524                         list_del(&r_list->head);
 525                         drm_ht_remove_key(&dev->map_hash,
 526                                           r_list->user_token >> PAGE_SHIFT);
 527                         kfree(r_list);
 528                         found = 1;
 529                         break;
 530                 }
 531         }
 532
 533         if (!found)
 534                 return -EINVAL;
 535
 536         switch (map->type) {
 537         case _DRM_REGISTERS:
 538                 iounmap(map->handle);
 539                 fallthrough;
 540         case _DRM_FRAME_BUFFER:
 541                 arch_phys_wc_del(map->mtrr);
 542                 break;
 543         case _DRM_SHM:
 544                 vfree(map->handle);
 545                 if (master) {
 546                         if (dev->sigdata.lock == master->lock.hw_lock)
 547                                 dev->sigdata.lock = NULL;
 548                         master->lock.hw_lock = NULL;   /* SHM removed */
 549                         master->lock.file_priv = NULL;
 550                         wake_up_interruptible_all(&master->lock.lock_queue);
 551                 }
 552                 break;
 553         case _DRM_AGP:
 554         case _DRM_SCATTER_GATHER:
 555                 break;
 556         case _DRM_CONSISTENT:
 557                 dma_free_coherent(dev->dev,
 558                                   map->size,
 559                                   map->handle,
 560                                   map->offset);
 561                 break;
 562         }
 563         kfree(map);
 564
 565         return 0;
 566 }
 567 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
 568
 569 void drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
 570 {
 571         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 572                 return;
 573
 574         mutex_lock(&dev->struct_mutex);
 575         drm_legacy_rmmap_locked(dev, map);
 576         mutex_unlock(&dev->struct_mutex);
 577 }
 578 EXPORT_SYMBOL(drm_legacy_rmmap);
 579
 580 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
 581 {
 582         struct drm_map_list *r_list, *list_temp;
 583
 584         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 585                 return;
 586
 587         mutex_lock(&dev->struct_mutex);
 588         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 589                 if (r_list->master == master) {
 590                         drm_legacy_rmmap_locked(dev, r_list->map);
 591                         r_list = NULL;
 592                 }
 593         }
 594         mutex_unlock(&dev->struct_mutex);
 595 }
 596
 597 void drm_legacy_rmmaps(struct drm_device *dev)
 598 {
 599         struct drm_map_list *r_list, *list_temp;
 600
 601         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
 602                 drm_legacy_rmmap(dev, r_list->map);
 603 }
 604
 605 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 606  * the last close of the device, and this is necessary for cleanup when things
 607  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 608  * like a pointless exercise since they're going away anyway.
 609  *
 610  * One use case might be after addmap is allowed for normal users for SHM and
 611  * gets used by drivers that the server doesn't need to care about.  This seems
 612  * unlikely.
 613  *
 614  * \param inode device inode.
 615  * \param file_priv DRM file private.
 616  * \param cmd command.
 617  * \param arg pointer to a struct drm_map structure.
 618  * \return zero on success or a negative value on error.
 619  */
 620 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
 621                            struct drm_file *file_priv)
 622 {
 623         struct drm_map *request = data;
 624         struct drm_local_map *map = NULL;
 625         struct drm_map_list *r_list;
 626         int ret;
 627
 628         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 629                 return -EOPNOTSUPP;
 630
 631         mutex_lock(&dev->struct_mutex);
 632         list_for_each_entry(r_list, &dev->maplist, head) {
 633                 if (r_list->map &&
 634                     r_list->user_token == (unsigned long)request->handle &&
 635                     r_list->map->flags & _DRM_REMOVABLE) {
 636                         map = r_list->map;
 637                         break;
 638                 }
 639         }
 640
 641         /* List has wrapped around to the head pointer, or it's empty we didn't
 642          * find anything.
 643          */
 644         if (list_empty(&dev->maplist) || !map) {
 645                 mutex_unlock(&dev->struct_mutex);
 646                 return -EINVAL;
 647         }
 648
 649         /* Register and framebuffer maps are permanent */
 650         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 651                 mutex_unlock(&dev->struct_mutex);
 652                 return 0;
 653         }
 654
 655         ret = drm_legacy_rmmap_locked(dev, map);
 656
 657         mutex_unlock(&dev->struct_mutex);
 658
 659         return ret;
 660 }
 661
 662 /*
 663  * Cleanup after an error on one of the addbufs() functions.
 664  *
 665  * \param dev DRM device.
 666  * \param entry buffer entry where the error occurred.
 667  *
 668  * Frees any pages and buffers associated with the given entry.
 669  */
 670 static void drm_cleanup_buf_error(struct drm_device *dev,
 671                                   struct drm_buf_entry *entry)
 672 {
 673         drm_dma_handle_t *dmah;
 674         int i;
 675
 676         if (entry->seg_count) {
 677                 for (i = 0; i < entry->seg_count; i++) {
 678                         if (entry->seglist[i]) {
 679                                 dmah = entry->seglist[i];
 680                                 dma_free_coherent(dev->dev,
 681                                                   dmah->size,
 682                                                   dmah->vaddr,
 683                                                   dmah->busaddr);
 684                                 kfree(dmah);
 685                         }
 686                 }
 687                 kfree(entry->seglist);
 688
 689                 entry->seg_count = 0;
 690         }
 691
 692         if (entry->buf_count) {
 693                 for (i = 0; i < entry->buf_count; i++) {
 694                         kfree(entry->buflist[i].dev_private);
 695                 }
 696                 kfree(entry->buflist);
 697
 698                 entry->buf_count = 0;
 699         }
 700 }
 701
 702 #if IS_ENABLED(CONFIG_AGP)
 703 /*
 704  * Add AGP buffers for DMA transfers.
 705  *
 706  * \param dev struct drm_device to which the buffers are to be added.
 707  * \param request pointer to a struct drm_buf_desc describing the request.
 708  * \return zero on success or a negative number on failure.
 709  *
 710  * After some sanity checks creates a drm_buf structure for each buffer and
 711  * reallocates the buffer list of the same size order to accommodate the new
 712  * buffers.
 713  */
 714 int drm_legacy_addbufs_agp(struct drm_device *dev,
 715                            struct drm_buf_desc *request)
 716 {
 717         struct drm_device_dma *dma = dev->dma;
 718         struct drm_buf_entry *entry;
 719         struct drm_agp_mem *agp_entry;
 720         struct drm_buf *buf;
 721         unsigned long offset;
 722         unsigned long agp_offset;
 723         int count;
 724         int order;
 725         int size;
 726         int alignment;
 727         int page_order;
 728         int total;
 729         int byte_count;
 730         int i, valid;
 731         struct drm_buf **temp_buflist;
 732
 733         if (!dma)
 734                 return -EINVAL;
 735
 736         count = request->count;
 737         order = order_base_2(request->size);
 738         size = 1 << order;
 739
 740         alignment = (request->flags & _DRM_PAGE_ALIGN)
 741             ? PAGE_ALIGN(size) : size;
 742         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 743         total = PAGE_SIZE << page_order;
 744
 745         byte_count = 0;
 746         agp_offset = dev->agp->base + request->agp_start;
 747
 748         DRM_DEBUG("count:      %d\n", count);
 749         DRM_DEBUG("order:      %d\n", order);
 750         DRM_DEBUG("size:       %d\n", size);
 751         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 752         DRM_DEBUG("alignment:  %d\n", alignment);
 753         DRM_DEBUG("page_order: %d\n", page_order);
 754         DRM_DEBUG("total:      %d\n", total);
 755
 756         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 757                 return -EINVAL;
 758
 759         /* Make sure buffers are located in AGP memory that we own */
 760         valid = 0;
 761         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 762                 if ((agp_offset >= agp_entry->bound) &&
 763                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 764                         valid = 1;
 765                         break;
 766                 }
 767         }
 768         if (!list_empty(&dev->agp->memory) && !valid) {
 769                 DRM_DEBUG("zone invalid\n");
 770                 return -EINVAL;
 771         }
 772         spin_lock(&dev->buf_lock);
 773         if (dev->buf_use) {
 774                 spin_unlock(&dev->buf_lock);
 775                 return -EBUSY;
 776         }
 777         atomic_inc(&dev->buf_alloc);
 778         spin_unlock(&dev->buf_lock);
 779
 780         mutex_lock(&dev->struct_mutex);
 781         entry = &dma->bufs[order];
 782         if (entry->buf_count) {
 783                 mutex_unlock(&dev->struct_mutex);
 784                 atomic_dec(&dev->buf_alloc);
 785                 return -ENOMEM; /* May only call once for each order */
 786         }
 787
 788         if (count < 0 || count > 4096) {
 789                 mutex_unlock(&dev->struct_mutex);
 790                 atomic_dec(&dev->buf_alloc);
 791                 return -EINVAL;
 792         }
 793
 794         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 795         if (!entry->buflist) {
 796                 mutex_unlock(&dev->struct_mutex);
 797                 atomic_dec(&dev->buf_alloc);
 798                 return -ENOMEM;
 799         }
 800
 801         entry->buf_size = size;
 802         entry->page_order = page_order;
 803
 804         offset = 0;
 805
 806         while (entry->buf_count < count) {
 807                 buf = &entry->buflist[entry->buf_count];
 808                 buf->idx = dma->buf_count + entry->buf_count;
 809                 buf->total = alignment;
 810                 buf->order = order;
 811                 buf->used = 0;
 812
 813                 buf->offset = (dma->byte_count + offset);
 814                 buf->bus_address = agp_offset + offset;
 815                 buf->address = (void *)(agp_offset + offset);
 816                 buf->next = NULL;
 817                 buf->waiting = 0;
 818                 buf->pending = 0;
 819                 buf->file_priv = NULL;
 820
 821                 buf->dev_priv_size = dev->driver->dev_priv_size;
 822                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 823                 if (!buf->dev_private) {
 824                         /* Set count correctly so we free the proper amount. */
 825                         entry->buf_count = count;
 826                         drm_cleanup_buf_error(dev, entry);
 827                         mutex_unlock(&dev->struct_mutex);
 828                         atomic_dec(&dev->buf_alloc);
 829                         return -ENOMEM;
 830                 }
 831
 832                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 833
 834                 offset += alignment;
 835                 entry->buf_count++;
 836                 byte_count += PAGE_SIZE << page_order;
 837         }
 838
 839         DRM_DEBUG("byte_count: %d\n", byte_count);
 840
 841         temp_buflist = krealloc(dma->buflist,
 842                                 (dma->buf_count + entry->buf_count) *
 843                                 sizeof(*dma->buflist), GFP_KERNEL);
 844         if (!temp_buflist) {
 845                 /* Free the entry because it isn't valid */
 846                 drm_cleanup_buf_error(dev, entry);
 847                 mutex_unlock(&dev->struct_mutex);
 848                 atomic_dec(&dev->buf_alloc);
 849                 return -ENOMEM;
 850         }
 851         dma->buflist = temp_buflist;
 852
 853         for (i = 0; i < entry->buf_count; i++) {
 854                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 855         }
 856
 857         dma->buf_count += entry->buf_count;
 858         dma->seg_count += entry->seg_count;
 859         dma->page_count += byte_count >> PAGE_SHIFT;
 860         dma->byte_count += byte_count;
 861
 862         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 863         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 864
 865         mutex_unlock(&dev->struct_mutex);
 866
 867         request->count = entry->buf_count;
 868         request->size = size;
 869
 870         dma->flags = _DRM_DMA_USE_AGP;
 871
 872         atomic_dec(&dev->buf_alloc);
 873         return 0;
 874 }
 875 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
 876 #endif /* CONFIG_AGP */
 877
 878 int drm_legacy_addbufs_pci(struct drm_device *dev,
 879                            struct drm_buf_desc *request)
 880 {
 881         struct drm_device_dma *dma = dev->dma;
 882         int count;
 883         int order;
 884         int size;
 885         int total;
 886         int page_order;
 887         struct drm_buf_entry *entry;
 888         drm_dma_handle_t *dmah;
 889         struct drm_buf *buf;
 890         int alignment;
 891         unsigned long offset;
 892         int i;
 893         int byte_count;
 894         int page_count;
 895         unsigned long *temp_pagelist;
 896         struct drm_buf **temp_buflist;
 897
 898         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 899                 return -EOPNOTSUPP;
 900
 901         if (!dma)
 902                 return -EINVAL;
 903
 904         if (!capable(CAP_SYS_ADMIN))
 905                 return -EPERM;
 906
 907         count = request->count;
 908         order = order_base_2(request->size);
 909         size = 1 << order;
 910
 911         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 912                   request->count, request->size, size, order);
 913
 914         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 915                 return -EINVAL;
 916
 917         alignment = (request->flags & _DRM_PAGE_ALIGN)
 918             ? PAGE_ALIGN(size) : size;
 919         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 920         total = PAGE_SIZE << page_order;
 921
 922         spin_lock(&dev->buf_lock);
 923         if (dev->buf_use) {
 924                 spin_unlock(&dev->buf_lock);
 925                 return -EBUSY;
 926         }
 927         atomic_inc(&dev->buf_alloc);
 928         spin_unlock(&dev->buf_lock);
 929
 930         mutex_lock(&dev->struct_mutex);
 931         entry = &dma->bufs[order];
 932         if (entry->buf_count) {
 933                 mutex_unlock(&dev->struct_mutex);
 934                 atomic_dec(&dev->buf_alloc);
 935                 return -ENOMEM; /* May only call once for each order */
 936         }
 937
 938         if (count < 0 || count > 4096) {
 939                 mutex_unlock(&dev->struct_mutex);
 940                 atomic_dec(&dev->buf_alloc);
 941                 return -EINVAL;
 942         }
 943
 944         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 945         if (!entry->buflist) {
 946                 mutex_unlock(&dev->struct_mutex);
 947                 atomic_dec(&dev->buf_alloc);
 948                 return -ENOMEM;
 949         }
 950
 951         entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
 952         if (!entry->seglist) {
 953                 kfree(entry->buflist);
 954                 mutex_unlock(&dev->struct_mutex);
 955                 atomic_dec(&dev->buf_alloc);
 956                 return -ENOMEM;
 957         }
 958
 959         /* Keep the original pagelist until we know all the allocations
 960          * have succeeded
 961          */
 962         temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
 963                                       sizeof(*dma->pagelist),
 964                                       GFP_KERNEL);
 965         if (!temp_pagelist) {
 966                 kfree(entry->buflist);
 967                 kfree(entry->seglist);
 968                 mutex_unlock(&dev->struct_mutex);
 969                 atomic_dec(&dev->buf_alloc);
 970                 return -ENOMEM;
 971         }
 972         memcpy(temp_pagelist,
 973                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 974         DRM_DEBUG("pagelist: %d entries\n",
 975                   dma->page_count + (count << page_order));
 976
 977         entry->buf_size = size;
 978         entry->page_order = page_order;
 979         byte_count = 0;
 980         page_count = 0;
 981
 982         while (entry->buf_count < count) {
 983                 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
 984                 if (!dmah) {
 985                         /* Set count correctly so we free the proper amount. */
 986                         entry->buf_count = count;
 987                         entry->seg_count = count;
 988                         drm_cleanup_buf_error(dev, entry);
 989                         kfree(temp_pagelist);
 990                         mutex_unlock(&dev->struct_mutex);
 991                         atomic_dec(&dev->buf_alloc);
 992                         return -ENOMEM;
 993                 }
 994
 995                 dmah->size = total;
 996                 dmah->vaddr = dma_alloc_coherent(dev->dev,
 997                                                  dmah->size,
 998                                                  &dmah->busaddr,
 999                                                  GFP_KERNEL);
1000                 if (!dmah->vaddr) {
1001                         kfree(dmah);
1002
1003                         /* Set count correctly so we free the proper amount. */
1004                         entry->buf_count = count;
1005                         entry->seg_count = count;
1006                         drm_cleanup_buf_error(dev, entry);
1007                         kfree(temp_pagelist);
1008                         mutex_unlock(&dev->struct_mutex);
1009                         atomic_dec(&dev->buf_alloc);
1010                         return -ENOMEM;
1011                 }
1012                 entry->seglist[entry->seg_count++] = dmah;
1013                 for (i = 0; i < (1 << page_order); i++) {
1014                         DRM_DEBUG("page %d @ 0x%08lx\n",
1015                                   dma->page_count + page_count,
1016                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
1017                         temp_pagelist[dma->page_count + page_count++]
1018                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
1019                 }
1020                 for (offset = 0;
1021                      offset + size <= total && entry->buf_count < count;
1022                      offset += alignment, ++entry->buf_count) {
1023                         buf = &entry->buflist[entry->buf_count];
1024                         buf->idx = dma->buf_count + entry->buf_count;
1025                         buf->total = alignment;
1026                         buf->order = order;
1027                         buf->used = 0;
1028                         buf->offset = (dma->byte_count + byte_count + offset);
1029                         buf->address = (void *)(dmah->vaddr + offset);
1030                         buf->bus_address = dmah->busaddr + offset;
1031                         buf->next = NULL;
1032                         buf->waiting = 0;
1033                         buf->pending = 0;
1034                         buf->file_priv = NULL;
1035
1036                         buf->dev_priv_size = dev->driver->dev_priv_size;
1037                         buf->dev_private = kzalloc(buf->dev_priv_size,
1038                                                 GFP_KERNEL);
1039                         if (!buf->dev_private) {
1040                                 /* Set count correctly so we free the proper amount. */
1041                                 entry->buf_count = count;
1042                                 entry->seg_count = count;
1043                                 drm_cleanup_buf_error(dev, entry);
1044                                 kfree(temp_pagelist);
1045                                 mutex_unlock(&dev->struct_mutex);
1046                                 atomic_dec(&dev->buf_alloc);
1047                                 return -ENOMEM;
1048                         }
1049
1050                         DRM_DEBUG("buffer %d @ %p\n",
1051                                   entry->buf_count, buf->address);
1052                 }
1053                 byte_count += PAGE_SIZE << page_order;
1054         }
1055
1056         temp_buflist = krealloc(dma->buflist,
1057                                 (dma->buf_count + entry->buf_count) *
1058                                 sizeof(*dma->buflist), GFP_KERNEL);
1059         if (!temp_buflist) {
1060                 /* Free the entry because it isn't valid */
1061                 drm_cleanup_buf_error(dev, entry);
1062                 kfree(temp_pagelist);
1063                 mutex_unlock(&dev->struct_mutex);
1064                 atomic_dec(&dev->buf_alloc);
1065                 return -ENOMEM;
1066         }
1067         dma->buflist = temp_buflist;
1068
1069         for (i = 0; i < entry->buf_count; i++) {
1070                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1071         }
1072
1073         /* No allocations failed, so now we can replace the original pagelist
1074          * with the new one.
1075          */
1076         if (dma->page_count) {
1077                 kfree(dma->pagelist);
1078         }
1079         dma->pagelist = temp_pagelist;
1080
1081         dma->buf_count += entry->buf_count;
1082         dma->seg_count += entry->seg_count;
1083         dma->page_count += entry->seg_count << page_order;
1084         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1085
1086         mutex_unlock(&dev->struct_mutex);
1087
1088         request->count = entry->buf_count;
1089         request->size = size;
1090
1091         if (request->flags & _DRM_PCI_BUFFER_RO)
1092                 dma->flags = _DRM_DMA_USE_PCI_RO;
1093
1094         atomic_dec(&dev->buf_alloc);
1095         return 0;
1096
1097 }
1098 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1099
1100 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1101                                  struct drm_buf_desc *request)
1102 {
1103         struct drm_device_dma *dma = dev->dma;
1104         struct drm_buf_entry *entry;
1105         struct drm_buf *buf;
1106         unsigned long offset;
1107         unsigned long agp_offset;
1108         int count;
1109         int order;
1110         int size;
1111         int alignment;
1112         int page_order;
1113         int total;
1114         int byte_count;
1115         int i;
1116         struct drm_buf **temp_buflist;
1117
1118         if (!drm_core_check_feature(dev, DRIVER_SG))
1119                 return -EOPNOTSUPP;
1120
1121         if (!dma)
1122                 return -EINVAL;
1123
1124         if (!capable(CAP_SYS_ADMIN))
1125                 return -EPERM;
1126
1127         count = request->count;
1128         order = order_base_2(request->size);
1129         size = 1 << order;
1130
1131         alignment = (request->flags & _DRM_PAGE_ALIGN)
1132             ? PAGE_ALIGN(size) : size;
1133         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1134         total = PAGE_SIZE << page_order;
1135
1136         byte_count = 0;
1137         agp_offset = request->agp_start;
1138
1139         DRM_DEBUG("count:      %d\n", count);
1140         DRM_DEBUG("order:      %d\n", order);
1141         DRM_DEBUG("size:       %d\n", size);
1142         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1143         DRM_DEBUG("alignment:  %d\n", alignment);
1144         DRM_DEBUG("page_order: %d\n", page_order);
1145         DRM_DEBUG("total:      %d\n", total);
1146
1147         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1148                 return -EINVAL;
1149
1150         spin_lock(&dev->buf_lock);
1151         if (dev->buf_use) {
1152                 spin_unlock(&dev->buf_lock);
1153                 return -EBUSY;
1154         }
1155         atomic_inc(&dev->buf_alloc);
1156         spin_unlock(&dev->buf_lock);
1157
1158         mutex_lock(&dev->struct_mutex);
1159         entry = &dma->bufs[order];
1160         if (entry->buf_count) {
1161                 mutex_unlock(&dev->struct_mutex);
1162                 atomic_dec(&dev->buf_alloc);
1163                 return -ENOMEM; /* May only call once for each order */
1164         }
1165
1166         if (count < 0 || count > 4096) {
1167                 mutex_unlock(&dev->struct_mutex);
1168                 atomic_dec(&dev->buf_alloc);
1169                 return -EINVAL;
1170         }
1171
1172         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1173         if (!entry->buflist) {
1174                 mutex_unlock(&dev->struct_mutex);
1175                 atomic_dec(&dev->buf_alloc);
1176                 return -ENOMEM;
1177         }
1178
1179         entry->buf_size = size;
1180         entry->page_order = page_order;
1181
1182         offset = 0;
1183
1184         while (entry->buf_count < count) {
1185                 buf = &entry->buflist[entry->buf_count];
1186                 buf->idx = dma->buf_count + entry->buf_count;
1187                 buf->total = alignment;
1188                 buf->order = order;
1189                 buf->used = 0;
1190
1191                 buf->offset = (dma->byte_count + offset);
1192                 buf->bus_address = agp_offset + offset;
1193                 buf->address = (void *)(agp_offset + offset
1194                                         + (unsigned long)dev->sg->virtual);
1195                 buf->next = NULL;
1196                 buf->waiting = 0;
1197                 buf->pending = 0;
1198                 buf->file_priv = NULL;
1199
1200                 buf->dev_priv_size = dev->driver->dev_priv_size;
1201                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1202                 if (!buf->dev_private) {
1203                         /* Set count correctly so we free the proper amount. */
1204                         entry->buf_count = count;
1205                         drm_cleanup_buf_error(dev, entry);
1206                         mutex_unlock(&dev->struct_mutex);
1207                         atomic_dec(&dev->buf_alloc);
1208                         return -ENOMEM;
1209                 }
1210
1211                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1212
1213                 offset += alignment;
1214                 entry->buf_count++;
1215                 byte_count += PAGE_SIZE << page_order;
1216         }
1217
1218         DRM_DEBUG("byte_count: %d\n", byte_count);
1219
1220         temp_buflist = krealloc(dma->buflist,
1221                                 (dma->buf_count + entry->buf_count) *
1222                                 sizeof(*dma->buflist), GFP_KERNEL);
1223         if (!temp_buflist) {
1224                 /* Free the entry because it isn't valid */
1225                 drm_cleanup_buf_error(dev, entry);
1226                 mutex_unlock(&dev->struct_mutex);
1227                 atomic_dec(&dev->buf_alloc);
1228                 return -ENOMEM;
1229         }
1230         dma->buflist = temp_buflist;
1231
1232         for (i = 0; i < entry->buf_count; i++) {
1233                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1234         }
1235
1236         dma->buf_count += entry->buf_count;
1237         dma->seg_count += entry->seg_count;
1238         dma->page_count += byte_count >> PAGE_SHIFT;
1239         dma->byte_count += byte_count;
1240
1241         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1242         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1243
1244         mutex_unlock(&dev->struct_mutex);
1245
1246         request->count = entry->buf_count;
1247         request->size = size;
1248
1249         dma->flags = _DRM_DMA_USE_SG;
1250
1251         atomic_dec(&dev->buf_alloc);
1252         return 0;
1253 }
1254
1255 /*
1256  * Add buffers for DMA transfers (ioctl).
1257  *
1258  * \param inode device inode.
1259  * \param file_priv DRM file private.
1260  * \param cmd command.
1261  * \param arg pointer to a struct drm_buf_desc request.
1262  * \return zero on success or a negative number on failure.
1263  *
1264  * According with the memory type specified in drm_buf_desc::flags and the
1265  * build options, it dispatches the call either to addbufs_agp(),
1266  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1267  * PCI memory respectively.
1268  */
1269 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1270                        struct drm_file *file_priv)
1271 {
1272         struct drm_buf_desc *request = data;
1273         int ret;
1274
1275         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1276                 return -EOPNOTSUPP;
1277
1278         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1279                 return -EOPNOTSUPP;
1280
1281 #if IS_ENABLED(CONFIG_AGP)
1282         if (request->flags & _DRM_AGP_BUFFER)
1283                 ret = drm_legacy_addbufs_agp(dev, request);
1284         else
1285 #endif
1286         if (request->flags & _DRM_SG_BUFFER)
1287                 ret = drm_legacy_addbufs_sg(dev, request);
1288         else if (request->flags & _DRM_FB_BUFFER)
1289                 ret = -EINVAL;
1290         else
1291                 ret = drm_legacy_addbufs_pci(dev, request);
1292
1293         return ret;
1294 }
1295
1296 /*
1297  * Get information about the buffer mappings.
1298  *
1299  * This was originally mean for debugging purposes, or by a sophisticated
1300  * client library to determine how best to use the available buffers (e.g.,
1301  * large buffers can be used for image transfer).
1302  *
1303  * \param inode device inode.
1304  * \param file_priv DRM file private.
1305  * \param cmd command.
1306  * \param arg pointer to a drm_buf_info structure.
1307  * \return zero on success or a negative number on failure.
1308  *
1309  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1310  * lock, preventing of allocating more buffers after this call. Information
1311  * about each requested buffer is then copied into user space.
1312  */
1313 int __drm_legacy_infobufs(struct drm_device *dev,
1314                         void *data, int *p,
1315                         int (*f)(void *, int, struct drm_buf_entry *))
1316 {
1317         struct drm_device_dma *dma = dev->dma;
1318         int i;
1319         int count;
1320
1321         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1322                 return -EOPNOTSUPP;
1323
1324         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1325                 return -EOPNOTSUPP;
1326
1327         if (!dma)
1328                 return -EINVAL;
1329
1330         spin_lock(&dev->buf_lock);
1331         if (atomic_read(&dev->buf_alloc)) {
1332                 spin_unlock(&dev->buf_lock);
1333                 return -EBUSY;
1334         }
1335         ++dev->buf_use;         /* Can't allocate more after this call */
1336         spin_unlock(&dev->buf_lock);
1337
1338         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1339                 if (dma->bufs[i].buf_count)
1340                         ++count;
1341         }
1342
1343         DRM_DEBUG("count = %d\n", count);
1344
1345         if (*p >= count) {
1346                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1347                         struct drm_buf_entry *from = &dma->bufs[i];
1348
1349                         if (from->buf_count) {
1350                                 if (f(data, count, from) < 0)
1351                                         return -EFAULT;
1352                                 DRM_DEBUG("%d %d %d %d %d\n",
1353                                           i,
1354                                           dma->bufs[i].buf_count,
1355                                           dma->bufs[i].buf_size,
1356                                           dma->bufs[i].low_mark,
1357                                           dma->bufs[i].high_mark);
1358                                 ++count;
1359                         }
1360                 }
1361         }
1362         *p = count;
1363
1364         return 0;
1365 }
1366
1367 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1368 {
1369         struct drm_buf_info *request = data;
1370         struct drm_buf_desc __user *to = &request->list[count];
1371         struct drm_buf_desc v = {.count = from->buf_count,
1372                                  .size = from->buf_size,
1373                                  .low_mark = from->low_mark,
1374                                  .high_mark = from->high_mark};
1375
1376         if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1377                 return -EFAULT;
1378         return 0;
1379 }
1380
1381 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1382                         struct drm_file *file_priv)
1383 {
1384         struct drm_buf_info *request = data;
1385
1386         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1387 }
1388
1389 /*
1390  * Specifies a low and high water mark for buffer allocation
1391  *
1392  * \param inode device inode.
1393  * \param file_priv DRM file private.
1394  * \param cmd command.
1395  * \param arg a pointer to a drm_buf_desc structure.
1396  * \return zero on success or a negative number on failure.
1397  *
1398  * Verifies that the size order is bounded between the admissible orders and
1399  * updates the respective drm_device_dma::bufs entry low and high water mark.
1400  *
1401  * \note This ioctl is deprecated and mostly never used.
1402  */
1403 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1404                         struct drm_file *file_priv)
1405 {
1406         struct drm_device_dma *dma = dev->dma;
1407         struct drm_buf_desc *request = data;
1408         int order;
1409         struct drm_buf_entry *entry;
1410
1411         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1412                 return -EOPNOTSUPP;
1413
1414         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1415                 return -EOPNOTSUPP;
1416
1417         if (!dma)
1418                 return -EINVAL;
1419
1420         DRM_DEBUG("%d, %d, %d\n",
1421                   request->size, request->low_mark, request->high_mark);
1422         order = order_base_2(request->size);
1423         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1424                 return -EINVAL;
1425         entry = &dma->bufs[order];
1426
1427         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1428                 return -EINVAL;
1429         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1430                 return -EINVAL;
1431
1432         entry->low_mark = request->low_mark;
1433         entry->high_mark = request->high_mark;
1434
1435         return 0;
1436 }
1437
1438 /*
1439  * Unreserve the buffers in list, previously reserved using drmDMA.
1440  *
1441  * \param inode device inode.
1442  * \param file_priv DRM file private.
1443  * \param cmd command.
1444  * \param arg pointer to a drm_buf_free structure.
1445  * \return zero on success or a negative number on failure.
1446  *
1447  * Calls free_buffer() for each used buffer.
1448  * This function is primarily used for debugging.
1449  */
1450 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1451                         struct drm_file *file_priv)
1452 {
1453         struct drm_device_dma *dma = dev->dma;
1454         struct drm_buf_free *request = data;
1455         int i;
1456         int idx;
1457         struct drm_buf *buf;
1458
1459         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1460                 return -EOPNOTSUPP;
1461
1462         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1463                 return -EOPNOTSUPP;
1464
1465         if (!dma)
1466                 return -EINVAL;
1467
1468         DRM_DEBUG("%d\n", request->count);
1469         for (i = 0; i < request->count; i++) {
1470                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1471                         return -EFAULT;
1472                 if (idx < 0 || idx >= dma->buf_count) {
1473                         DRM_ERROR("Index %d (of %d max)\n",
1474                                   idx, dma->buf_count - 1);
1475                         return -EINVAL;
1476                 }
1477                 idx = array_index_nospec(idx, dma->buf_count);
1478                 buf = dma->buflist[idx];
1479                 if (buf->file_priv != file_priv) {
1480                         DRM_ERROR("Process %d freeing buffer not owned\n",
1481                                   task_pid_nr(current));
1482                         return -EINVAL;
1483                 }
1484                 drm_legacy_free_buffer(dev, buf);
1485         }
1486
1487         return 0;
1488 }
1489
1490 /*
1491  * Maps all of the DMA buffers into client-virtual space (ioctl).
1492  *
1493  * \param inode device inode.
1494  * \param file_priv DRM file private.
1495  * \param cmd command.
1496  * \param arg pointer to a drm_buf_map structure.
1497  * \return zero on success or a negative number on failure.
1498  *
1499  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1500  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1501  * offset equal to 0, which drm_mmap() interprets as PCI buffers and calls
1502  * drm_mmap_dma().
1503  */
1504 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1505                          void __user **v,
1506                          int (*f)(void *, int, unsigned long,
1507                                  struct drm_buf *),
1508                                  struct drm_file *file_priv)
1509 {
1510         struct drm_device_dma *dma = dev->dma;
1511         int retcode = 0;
1512         unsigned long virtual;
1513         int i;
1514
1515         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1516                 return -EOPNOTSUPP;
1517
1518         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1519                 return -EOPNOTSUPP;
1520
1521         if (!dma)
1522                 return -EINVAL;
1523
1524         spin_lock(&dev->buf_lock);
1525         if (atomic_read(&dev->buf_alloc)) {
1526                 spin_unlock(&dev->buf_lock);
1527                 return -EBUSY;
1528         }
1529         dev->buf_use++;         /* Can't allocate more after this call */
1530         spin_unlock(&dev->buf_lock);
1531
1532         if (*p >= dma->buf_count) {
1533                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1534                     || (drm_core_check_feature(dev, DRIVER_SG)
1535                         && (dma->flags & _DRM_DMA_USE_SG))) {
1536                         struct drm_local_map *map = dev->agp_buffer_map;
1537                         unsigned long token = dev->agp_buffer_token;
1538
1539                         if (!map) {
1540                                 retcode = -EINVAL;
1541                                 goto done;
1542                         }
1543                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1544                                           PROT_READ | PROT_WRITE,
1545                                           MAP_SHARED,
1546                                           token);
1547                 } else {
1548                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1549                                           PROT_READ | PROT_WRITE,
1550                                           MAP_SHARED, 0);
1551                 }
1552                 if (virtual > -1024UL) {
1553                         /* Real error */
1554                         retcode = (signed long)virtual;
1555                         goto done;
1556                 }
1557                 *v = (void __user *)virtual;
1558
1559                 for (i = 0; i < dma->buf_count; i++) {
1560                         if (f(data, i, virtual, dma->buflist[i]) < 0) {
1561                                 retcode = -EFAULT;
1562                                 goto done;
1563                         }
1564                 }
1565         }
1566       done:
1567         *p = dma->buf_count;
1568         DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1569
1570         return retcode;
1571 }
1572
1573 static int map_one_buf(void *data, int idx, unsigned long virtual,
1574                         struct drm_buf *buf)
1575 {
1576         struct drm_buf_map *request = data;
1577         unsigned long address = virtual + buf->offset;  /* *** */
1578
1579         if (copy_to_user(&request->list[idx].idx, &buf->idx,
1580                          sizeof(request->list[0].idx)))
1581                 return -EFAULT;
1582         if (copy_to_user(&request->list[idx].total, &buf->total,
1583                          sizeof(request->list[0].total)))
1584                 return -EFAULT;
1585         if (clear_user(&request->list[idx].used, sizeof(int)))
1586                 return -EFAULT;
1587         if (copy_to_user(&request->list[idx].address, &address,
1588                          sizeof(address)))
1589                 return -EFAULT;
1590         return 0;
1591 }
1592
1593 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1594                        struct drm_file *file_priv)
1595 {
1596         struct drm_buf_map *request = data;
1597
1598         return __drm_legacy_mapbufs(dev, data, &request->count,
1599                                     &request->virtual, map_one_buf,
1600                                     file_priv);
1601 }
1602
1603 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1604                   struct drm_file *file_priv)
1605 {
1606         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1607                 return -EOPNOTSUPP;
1608
1609         if (dev->driver->dma_ioctl)
1610                 return dev->driver->dma_ioctl(dev, data, file_priv);
1611         else
1612                 return -EINVAL;
1613 }
1614
1615 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1616 {
1617         struct drm_map_list *entry;
1618
1619         list_for_each_entry(entry, &dev->maplist, head) {
1620                 if (entry->map && entry->map->type == _DRM_SHM &&
1621                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1622                         return entry->map;
1623                 }
1624         }
1625         return NULL;
1626 }
1627 EXPORT_SYMBOL(drm_legacy_getsarea);