drivers/gpu/drm/drm

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This source file includes following definitions.
drm_find_matching_map
drm_map_handle
drm_addmap_core
drm_legacy_addmap
drm_legacy_findmap
drm_legacy_addmap_ioctl
drm_legacy_getmap_ioctl
drm_legacy_rmmap_locked
drm_legacy_rmmap
drm_legacy_master_rmmaps
drm_legacy_rmmaps
drm_legacy_rmmap_ioctl
drm_cleanup_buf_error
drm_legacy_addbufs_agp
drm_legacy_addbufs_pci
drm_legacy_addbufs_sg
drm_legacy_addbufs
__drm_legacy_infobufs
copy_one_buf
drm_legacy_infobufs
drm_legacy_markbufs
drm_legacy_freebufs
__drm_legacy_mapbufs
map_one_buf
drm_legacy_mapbufs
drm_legacy_dma_ioctl
drm_legacy_getsarea
   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/slab.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/vmalloc.h>
  39 
  40 #include <asm/shmparam.h>
  41 
  42 #include <drm/drm_agpsupport.h>
  43 #include <drm/drm_device.h>
  44 #include <drm/drm_drv.h>
  45 #include <drm/drm_file.h>
  46 #include <drm/drm_pci.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         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                 default: /* Make gcc happy */
  80                         ;
  81                 }
  82                 if (entry->map->offset == map->offset)
  83                         return entry;
  84         }
  85 
  86         return NULL;
  87 }
  88 
  89 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  90                           unsigned long user_token, int hashed_handle, int shm)
  91 {
  92         int use_hashed_handle, shift;
  93         unsigned long add;
  94 
  95 #if (BITS_PER_LONG == 64)
  96         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  97 #elif (BITS_PER_LONG == 32)
  98         use_hashed_handle = hashed_handle;
  99 #else
 100 #error Unsupported long size. Neither 64 nor 32 bits.
 101 #endif
 102 
 103         if (!use_hashed_handle) {
 104                 int ret;
 105                 hash->key = user_token >> PAGE_SHIFT;
 106                 ret = drm_ht_insert_item(&dev->map_hash, hash);
 107                 if (ret != -EINVAL)
 108                         return ret;
 109         }
 110 
 111         shift = 0;
 112         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 113         if (shm && (SHMLBA > PAGE_SIZE)) {
 114                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 115 
 116                 /* For shared memory, we have to preserve the SHMLBA
 117                  * bits of the eventual vma->vm_pgoff value during
 118                  * mmap().  Otherwise we run into cache aliasing problems
 119                  * on some platforms.  On these platforms, the pgoff of
 120                  * a mmap() request is used to pick a suitable virtual
 121                  * address for the mmap() region such that it will not
 122                  * cause cache aliasing problems.
 123                  *
 124                  * Therefore, make sure the SHMLBA relevant bits of the
 125                  * hash value we use are equal to those in the original
 126                  * kernel virtual address.
 127                  */
 128                 shift = bits;
 129                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 130         }
 131 
 132         return drm_ht_just_insert_please(&dev->map_hash, hash,
 133                                          user_token, 32 - PAGE_SHIFT - 3,
 134                                          shift, add);
 135 }
 136 
 137 /**
 138  * Core function to create a range of memory available for mapping by a
 139  * non-root process.
 140  *
 141  * Adjusts the memory offset to its absolute value according to the mapping
 142  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 143  * applicable and if supported by the kernel.
 144  */
 145 static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
 146                            unsigned int size, enum drm_map_type type,
 147                            enum drm_map_flags flags,
 148                            struct drm_map_list **maplist)
 149 {
 150         struct drm_local_map *map;
 151         struct drm_map_list *list;
 152         drm_dma_handle_t *dmah;
 153         unsigned long user_token;
 154         int ret;
 155 
 156         map = kmalloc(sizeof(*map), GFP_KERNEL);
 157         if (!map)
 158                 return -ENOMEM;
 159 
 160         map->offset = offset;
 161         map->size = size;
 162         map->flags = flags;
 163         map->type = type;
 164 
 165         /* Only allow shared memory to be removable since we only keep enough
 166          * book keeping information about shared memory to allow for removal
 167          * when processes fork.
 168          */
 169         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 170                 kfree(map);
 171                 return -EINVAL;
 172         }
 173         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 174                   (unsigned long long)map->offset, map->size, map->type);
 175 
 176         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 177          * hole created by that and it works around various broken drivers that use
 178          * a non-aligned quantity to map the SAREA. --BenH
 179          */
 180         if (map->type == _DRM_SHM)
 181                 map->size = PAGE_ALIGN(map->size);
 182 
 183         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 184                 kfree(map);
 185                 return -EINVAL;
 186         }
 187         map->mtrr = -1;
 188         map->handle = NULL;
 189 
 190         switch (map->type) {
 191         case _DRM_REGISTERS:
 192         case _DRM_FRAME_BUFFER:
 193 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 194                 if (map->offset + (map->size-1) < map->offset ||
 195                     map->offset < virt_to_phys(high_memory)) {
 196                         kfree(map);
 197                         return -EINVAL;
 198                 }
 199 #endif
 200                 /* Some drivers preinitialize some maps, without the X Server
 201                  * needing to be aware of it.  Therefore, we just return success
 202                  * when the server tries to create a duplicate map.
 203                  */
 204                 list = drm_find_matching_map(dev, map);
 205                 if (list != NULL) {
 206                         if (list->map->size != map->size) {
 207                                 DRM_DEBUG("Matching maps of type %d with "
 208                                           "mismatched sizes, (%ld vs %ld)\n",
 209                                           map->type, map->size,
 210                                           list->map->size);
 211                                 list->map->size = map->size;
 212                         }
 213 
 214                         kfree(map);
 215                         *maplist = list;
 216                         return 0;
 217                 }
 218 
 219                 if (map->type == _DRM_FRAME_BUFFER ||
 220                     (map->flags & _DRM_WRITE_COMBINING)) {
 221                         map->mtrr =
 222                                 arch_phys_wc_add(map->offset, map->size);
 223                 }
 224                 if (map->type == _DRM_REGISTERS) {
 225                         if (map->flags & _DRM_WRITE_COMBINING)
 226                                 map->handle = ioremap_wc(map->offset,
 227                                                          map->size);
 228                         else
 229                                 map->handle = ioremap(map->offset, map->size);
 230                         if (!map->handle) {
 231                                 kfree(map);
 232                                 return -ENOMEM;
 233                         }
 234                 }
 235 
 236                 break;
 237         case _DRM_SHM:
 238                 list = drm_find_matching_map(dev, map);
 239                 if (list != NULL) {
 240                         if (list->map->size != map->size) {
 241                                 DRM_DEBUG("Matching maps of type %d with "
 242                                           "mismatched sizes, (%ld vs %ld)\n",
 243                                           map->type, map->size, list->map->size);
 244                                 list->map->size = map->size;
 245                         }
 246 
 247                         kfree(map);
 248                         *maplist = list;
 249                         return 0;
 250                 }
 251                 map->handle = vmalloc_user(map->size);
 252                 DRM_DEBUG("%lu %d %p\n",
 253                           map->size, order_base_2(map->size), map->handle);
 254                 if (!map->handle) {
 255                         kfree(map);
 256                         return -ENOMEM;
 257                 }
 258                 map->offset = (unsigned long)map->handle;
 259                 if (map->flags & _DRM_CONTAINS_LOCK) {
 260                         /* Prevent a 2nd X Server from creating a 2nd lock */
 261                         if (dev->master->lock.hw_lock != NULL) {
 262                                 vfree(map->handle);
 263                                 kfree(map);
 264                                 return -EBUSY;
 265                         }
 266                         dev->sigdata.lock = dev->master->lock.hw_lock = map->handle;    /* Pointer to lock */
 267                 }
 268                 break;
 269         case _DRM_AGP: {
 270                 struct drm_agp_mem *entry;
 271                 int valid = 0;
 272 
 273                 if (!dev->agp) {
 274                         kfree(map);
 275                         return -EINVAL;
 276                 }
 277 #ifdef __alpha__
 278                 map->offset += dev->hose->mem_space->start;
 279 #endif
 280                 /* In some cases (i810 driver), user space may have already
 281                  * added the AGP base itself, because dev->agp->base previously
 282                  * only got set during AGP enable.  So, only add the base
 283                  * address if the map's offset isn't already within the
 284                  * aperture.
 285                  */
 286                 if (map->offset < dev->agp->base ||
 287                     map->offset > dev->agp->base +
 288                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 289                         map->offset += dev->agp->base;
 290                 }
 291                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 292 
 293                 /* This assumes the DRM is in total control of AGP space.
 294                  * It's not always the case as AGP can be in the control
 295                  * of user space (i.e. i810 driver). So this loop will get
 296                  * skipped and we double check that dev->agp->memory is
 297                  * actually set as well as being invalid before EPERM'ing
 298                  */
 299                 list_for_each_entry(entry, &dev->agp->memory, head) {
 300                         if ((map->offset >= entry->bound) &&
 301                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 302                                 valid = 1;
 303                                 break;
 304                         }
 305                 }
 306                 if (!list_empty(&dev->agp->memory) && !valid) {
 307                         kfree(map);
 308                         return -EPERM;
 309                 }
 310                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 311                           (unsigned long long)map->offset, map->size);
 312 
 313                 break;
 314         }
 315         case _DRM_SCATTER_GATHER:
 316                 if (!dev->sg) {
 317                         kfree(map);
 318                         return -EINVAL;
 319                 }
 320                 map->offset += (unsigned long)dev->sg->virtual;
 321                 break;
 322         case _DRM_CONSISTENT:
 323                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 324                  * As we're limiting the address to 2^32-1 (or less),
 325                  * casting it down to 32 bits is no problem, but we
 326                  * need to point to a 64bit variable first. */
 327                 dmah = drm_pci_alloc(dev, map->size, map->size);
 328                 if (!dmah) {
 329                         kfree(map);
 330                         return -ENOMEM;
 331                 }
 332                 map->handle = dmah->vaddr;
 333                 map->offset = (unsigned long)dmah->busaddr;
 334                 kfree(dmah);
 335                 break;
 336         default:
 337                 kfree(map);
 338                 return -EINVAL;
 339         }
 340 
 341         list = kzalloc(sizeof(*list), GFP_KERNEL);
 342         if (!list) {
 343                 if (map->type == _DRM_REGISTERS)
 344                         iounmap(map->handle);
 345                 kfree(map);
 346                 return -EINVAL;
 347         }
 348         list->map = map;
 349 
 350         mutex_lock(&dev->struct_mutex);
 351         list_add(&list->head, &dev->maplist);
 352 
 353         /* Assign a 32-bit handle */
 354         /* We do it here so that dev->struct_mutex protects the increment */
 355         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 356                 map->offset;
 357         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 358                              (map->type == _DRM_SHM));
 359         if (ret) {
 360                 if (map->type == _DRM_REGISTERS)
 361                         iounmap(map->handle);
 362                 kfree(map);
 363                 kfree(list);
 364                 mutex_unlock(&dev->struct_mutex);
 365                 return ret;
 366         }
 367 
 368         list->user_token = list->hash.key << PAGE_SHIFT;
 369         mutex_unlock(&dev->struct_mutex);
 370 
 371         if (!(map->flags & _DRM_DRIVER))
 372                 list->master = dev->master;
 373         *maplist = list;
 374         return 0;
 375 }
 376 
 377 int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
 378                       unsigned int size, enum drm_map_type type,
 379                       enum drm_map_flags flags, struct drm_local_map **map_ptr)
 380 {
 381         struct drm_map_list *list;
 382         int rc;
 383 
 384         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 385         if (!rc)
 386                 *map_ptr = list->map;
 387         return rc;
 388 }
 389 EXPORT_SYMBOL(drm_legacy_addmap);
 390 
 391 struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
 392                                          unsigned int token)
 393 {
 394         struct drm_map_list *_entry;
 395         list_for_each_entry(_entry, &dev->maplist, head)
 396                 if (_entry->user_token == token)
 397                         return _entry->map;
 398         return NULL;
 399 }
 400 EXPORT_SYMBOL(drm_legacy_findmap);
 401 
 402 /**
 403  * Ioctl to specify a range of memory that is available for mapping by a
 404  * non-root process.
 405  *
 406  * \param inode device inode.
 407  * \param file_priv DRM file private.
 408  * \param cmd command.
 409  * \param arg pointer to a drm_map structure.
 410  * \return zero on success or a negative value on error.
 411  *
 412  */
 413 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
 414                             struct drm_file *file_priv)
 415 {
 416         struct drm_map *map = data;
 417         struct drm_map_list *maplist;
 418         int err;
 419 
 420         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 421                 return -EPERM;
 422 
 423         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 424             !drm_core_check_feature(dev, DRIVER_LEGACY))
 425                 return -EOPNOTSUPP;
 426 
 427         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 428                               map->flags, &maplist);
 429 
 430         if (err)
 431                 return err;
 432 
 433         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 434         map->handle = (void *)(unsigned long)maplist->user_token;
 435 
 436         /*
 437          * It appears that there are no users of this value whatsoever --
 438          * drmAddMap just discards it.  Let's not encourage its use.
 439          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 440          *  it's not a real mtrr index anymore.)
 441          */
 442         map->mtrr = -1;
 443 
 444         return 0;
 445 }
 446 
 447 /*
 448  * Get a mapping information.
 449  *
 450  * \param inode device inode.
 451  * \param file_priv DRM file private.
 452  * \param cmd command.
 453  * \param arg user argument, pointing to a drm_map structure.
 454  *
 455  * \return zero on success or a negative number on failure.
 456  *
 457  * Searches for the mapping with the specified offset and copies its information
 458  * into userspace
 459  */
 460 int drm_legacy_getmap_ioctl(struct drm_device *dev, void *data,
 461                             struct drm_file *file_priv)
 462 {
 463         struct drm_map *map = data;
 464         struct drm_map_list *r_list = NULL;
 465         struct list_head *list;
 466         int idx;
 467         int i;
 468 
 469         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 470             !drm_core_check_feature(dev, DRIVER_LEGACY))
 471                 return -EOPNOTSUPP;
 472 
 473         idx = map->offset;
 474         if (idx < 0)
 475                 return -EINVAL;
 476 
 477         i = 0;
 478         mutex_lock(&dev->struct_mutex);
 479         list_for_each(list, &dev->maplist) {
 480                 if (i == idx) {
 481                         r_list = list_entry(list, struct drm_map_list, head);
 482                         break;
 483                 }
 484                 i++;
 485         }
 486         if (!r_list || !r_list->map) {
 487                 mutex_unlock(&dev->struct_mutex);
 488                 return -EINVAL;
 489         }
 490 
 491         map->offset = r_list->map->offset;
 492         map->size = r_list->map->size;
 493         map->type = r_list->map->type;
 494         map->flags = r_list->map->flags;
 495         map->handle = (void *)(unsigned long) r_list->user_token;
 496         map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
 497 
 498         mutex_unlock(&dev->struct_mutex);
 499 
 500         return 0;
 501 }
 502 
 503 /**
 504  * Remove a map private from list and deallocate resources if the mapping
 505  * isn't in use.
 506  *
 507  * Searches the map on drm_device::maplist, removes it from the list, see if
 508  * it's being used, and free any associated resource (such as MTRR's) if it's not
 509  * being on use.
 510  *
 511  * \sa drm_legacy_addmap
 512  */
 513 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 514 {
 515         struct drm_map_list *r_list = NULL, *list_t;
 516         drm_dma_handle_t dmah;
 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                 dmah.vaddr = map->handle;
 558                 dmah.busaddr = map->offset;
 559                 dmah.size = map->size;
 560                 __drm_legacy_pci_free(dev, &dmah);
 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_KMS_LEGACY_CONTEXT) &&
 572             !drm_core_check_feature(dev, DRIVER_LEGACY))
 573                 return;
 574 
 575         mutex_lock(&dev->struct_mutex);
 576         drm_legacy_rmmap_locked(dev, map);
 577         mutex_unlock(&dev->struct_mutex);
 578 }
 579 EXPORT_SYMBOL(drm_legacy_rmmap);
 580 
 581 void drm_legacy_master_rmmaps(struct drm_device *dev, struct drm_master *master)
 582 {
 583         struct drm_map_list *r_list, *list_temp;
 584 
 585         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 586                 return;
 587 
 588         mutex_lock(&dev->struct_mutex);
 589         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) {
 590                 if (r_list->master == master) {
 591                         drm_legacy_rmmap_locked(dev, r_list->map);
 592                         r_list = NULL;
 593                 }
 594         }
 595         mutex_unlock(&dev->struct_mutex);
 596 }
 597 
 598 void drm_legacy_rmmaps(struct drm_device *dev)
 599 {
 600         struct drm_map_list *r_list, *list_temp;
 601 
 602         list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
 603                 drm_legacy_rmmap(dev, r_list->map);
 604 }
 605 
 606 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 607  * the last close of the device, and this is necessary for cleanup when things
 608  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 609  * like a pointless exercise since they're going away anyway.
 610  *
 611  * One use case might be after addmap is allowed for normal users for SHM and
 612  * gets used by drivers that the server doesn't need to care about.  This seems
 613  * unlikely.
 614  *
 615  * \param inode device inode.
 616  * \param file_priv DRM file private.
 617  * \param cmd command.
 618  * \param arg pointer to a struct drm_map structure.
 619  * \return zero on success or a negative value on error.
 620  */
 621 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
 622                            struct drm_file *file_priv)
 623 {
 624         struct drm_map *request = data;
 625         struct drm_local_map *map = NULL;
 626         struct drm_map_list *r_list;
 627         int ret;
 628 
 629         if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
 630             !drm_core_check_feature(dev, DRIVER_LEGACY))
 631                 return -EOPNOTSUPP;
 632 
 633         mutex_lock(&dev->struct_mutex);
 634         list_for_each_entry(r_list, &dev->maplist, head) {
 635                 if (r_list->map &&
 636                     r_list->user_token == (unsigned long)request->handle &&
 637                     r_list->map->flags & _DRM_REMOVABLE) {
 638                         map = r_list->map;
 639                         break;
 640                 }
 641         }
 642 
 643         /* List has wrapped around to the head pointer, or it's empty we didn't
 644          * find anything.
 645          */
 646         if (list_empty(&dev->maplist) || !map) {
 647                 mutex_unlock(&dev->struct_mutex);
 648                 return -EINVAL;
 649         }
 650 
 651         /* Register and framebuffer maps are permanent */
 652         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 653                 mutex_unlock(&dev->struct_mutex);
 654                 return 0;
 655         }
 656 
 657         ret = drm_legacy_rmmap_locked(dev, map);
 658 
 659         mutex_unlock(&dev->struct_mutex);
 660 
 661         return ret;
 662 }
 663 
 664 /**
 665  * Cleanup after an error on one of the addbufs() functions.
 666  *
 667  * \param dev DRM device.
 668  * \param entry buffer entry where the error occurred.
 669  *
 670  * Frees any pages and buffers associated with the given entry.
 671  */
 672 static void drm_cleanup_buf_error(struct drm_device *dev,
 673                                   struct drm_buf_entry *entry)
 674 {
 675         int i;
 676 
 677         if (entry->seg_count) {
 678                 for (i = 0; i < entry->seg_count; i++) {
 679                         if (entry->seglist[i]) {
 680                                 drm_pci_free(dev, entry->seglist[i]);
 681                         }
 682                 }
 683                 kfree(entry->seglist);
 684 
 685                 entry->seg_count = 0;
 686         }
 687 
 688         if (entry->buf_count) {
 689                 for (i = 0; i < entry->buf_count; i++) {
 690                         kfree(entry->buflist[i].dev_private);
 691                 }
 692                 kfree(entry->buflist);
 693 
 694                 entry->buf_count = 0;
 695         }
 696 }
 697 
 698 #if IS_ENABLED(CONFIG_AGP)
 699 /**
 700  * Add AGP buffers for DMA transfers.
 701  *
 702  * \param dev struct drm_device to which the buffers are to be added.
 703  * \param request pointer to a struct drm_buf_desc describing the request.
 704  * \return zero on success or a negative number on failure.
 705  *
 706  * After some sanity checks creates a drm_buf structure for each buffer and
 707  * reallocates the buffer list of the same size order to accommodate the new
 708  * buffers.
 709  */
 710 int drm_legacy_addbufs_agp(struct drm_device *dev,
 711                            struct drm_buf_desc *request)
 712 {
 713         struct drm_device_dma *dma = dev->dma;
 714         struct drm_buf_entry *entry;
 715         struct drm_agp_mem *agp_entry;
 716         struct drm_buf *buf;
 717         unsigned long offset;
 718         unsigned long agp_offset;
 719         int count;
 720         int order;
 721         int size;
 722         int alignment;
 723         int page_order;
 724         int total;
 725         int byte_count;
 726         int i, valid;
 727         struct drm_buf **temp_buflist;
 728 
 729         if (!dma)
 730                 return -EINVAL;
 731 
 732         count = request->count;
 733         order = order_base_2(request->size);
 734         size = 1 << order;
 735 
 736         alignment = (request->flags & _DRM_PAGE_ALIGN)
 737             ? PAGE_ALIGN(size) : size;
 738         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 739         total = PAGE_SIZE << page_order;
 740 
 741         byte_count = 0;
 742         agp_offset = dev->agp->base + request->agp_start;
 743 
 744         DRM_DEBUG("count:      %d\n", count);
 745         DRM_DEBUG("order:      %d\n", order);
 746         DRM_DEBUG("size:       %d\n", size);
 747         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 748         DRM_DEBUG("alignment:  %d\n", alignment);
 749         DRM_DEBUG("page_order: %d\n", page_order);
 750         DRM_DEBUG("total:      %d\n", total);
 751 
 752         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 753                 return -EINVAL;
 754 
 755         /* Make sure buffers are located in AGP memory that we own */
 756         valid = 0;
 757         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 758                 if ((agp_offset >= agp_entry->bound) &&
 759                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 760                         valid = 1;
 761                         break;
 762                 }
 763         }
 764         if (!list_empty(&dev->agp->memory) && !valid) {
 765                 DRM_DEBUG("zone invalid\n");
 766                 return -EINVAL;
 767         }
 768         spin_lock(&dev->buf_lock);
 769         if (dev->buf_use) {
 770                 spin_unlock(&dev->buf_lock);
 771                 return -EBUSY;
 772         }
 773         atomic_inc(&dev->buf_alloc);
 774         spin_unlock(&dev->buf_lock);
 775 
 776         mutex_lock(&dev->struct_mutex);
 777         entry = &dma->bufs[order];
 778         if (entry->buf_count) {
 779                 mutex_unlock(&dev->struct_mutex);
 780                 atomic_dec(&dev->buf_alloc);
 781                 return -ENOMEM; /* May only call once for each order */
 782         }
 783 
 784         if (count < 0 || count > 4096) {
 785                 mutex_unlock(&dev->struct_mutex);
 786                 atomic_dec(&dev->buf_alloc);
 787                 return -EINVAL;
 788         }
 789 
 790         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 791         if (!entry->buflist) {
 792                 mutex_unlock(&dev->struct_mutex);
 793                 atomic_dec(&dev->buf_alloc);
 794                 return -ENOMEM;
 795         }
 796 
 797         entry->buf_size = size;
 798         entry->page_order = page_order;
 799 
 800         offset = 0;
 801 
 802         while (entry->buf_count < count) {
 803                 buf = &entry->buflist[entry->buf_count];
 804                 buf->idx = dma->buf_count + entry->buf_count;
 805                 buf->total = alignment;
 806                 buf->order = order;
 807                 buf->used = 0;
 808 
 809                 buf->offset = (dma->byte_count + offset);
 810                 buf->bus_address = agp_offset + offset;
 811                 buf->address = (void *)(agp_offset + offset);
 812                 buf->next = NULL;
 813                 buf->waiting = 0;
 814                 buf->pending = 0;
 815                 buf->file_priv = NULL;
 816 
 817                 buf->dev_priv_size = dev->driver->dev_priv_size;
 818                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 819                 if (!buf->dev_private) {
 820                         /* Set count correctly so we free the proper amount. */
 821                         entry->buf_count = count;
 822                         drm_cleanup_buf_error(dev, entry);
 823                         mutex_unlock(&dev->struct_mutex);
 824                         atomic_dec(&dev->buf_alloc);
 825                         return -ENOMEM;
 826                 }
 827 
 828                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 829 
 830                 offset += alignment;
 831                 entry->buf_count++;
 832                 byte_count += PAGE_SIZE << page_order;
 833         }
 834 
 835         DRM_DEBUG("byte_count: %d\n", byte_count);
 836 
 837         temp_buflist = krealloc(dma->buflist,
 838                                 (dma->buf_count + entry->buf_count) *
 839                                 sizeof(*dma->buflist), GFP_KERNEL);
 840         if (!temp_buflist) {
 841                 /* Free the entry because it isn't valid */
 842                 drm_cleanup_buf_error(dev, entry);
 843                 mutex_unlock(&dev->struct_mutex);
 844                 atomic_dec(&dev->buf_alloc);
 845                 return -ENOMEM;
 846         }
 847         dma->buflist = temp_buflist;
 848 
 849         for (i = 0; i < entry->buf_count; i++) {
 850                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 851         }
 852 
 853         dma->buf_count += entry->buf_count;
 854         dma->seg_count += entry->seg_count;
 855         dma->page_count += byte_count >> PAGE_SHIFT;
 856         dma->byte_count += byte_count;
 857 
 858         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 859         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 860 
 861         mutex_unlock(&dev->struct_mutex);
 862 
 863         request->count = entry->buf_count;
 864         request->size = size;
 865 
 866         dma->flags = _DRM_DMA_USE_AGP;
 867 
 868         atomic_dec(&dev->buf_alloc);
 869         return 0;
 870 }
 871 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
 872 #endif /* CONFIG_AGP */
 873 
 874 int drm_legacy_addbufs_pci(struct drm_device *dev,
 875                            struct drm_buf_desc *request)
 876 {
 877         struct drm_device_dma *dma = dev->dma;
 878         int count;
 879         int order;
 880         int size;
 881         int total;
 882         int page_order;
 883         struct drm_buf_entry *entry;
 884         drm_dma_handle_t *dmah;
 885         struct drm_buf *buf;
 886         int alignment;
 887         unsigned long offset;
 888         int i;
 889         int byte_count;
 890         int page_count;
 891         unsigned long *temp_pagelist;
 892         struct drm_buf **temp_buflist;
 893 
 894         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 895                 return -EOPNOTSUPP;
 896 
 897         if (!dma)
 898                 return -EINVAL;
 899 
 900         if (!capable(CAP_SYS_ADMIN))
 901                 return -EPERM;
 902 
 903         count = request->count;
 904         order = order_base_2(request->size);
 905         size = 1 << order;
 906 
 907         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 908                   request->count, request->size, size, order);
 909 
 910         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 911                 return -EINVAL;
 912 
 913         alignment = (request->flags & _DRM_PAGE_ALIGN)
 914             ? PAGE_ALIGN(size) : size;
 915         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 916         total = PAGE_SIZE << page_order;
 917 
 918         spin_lock(&dev->buf_lock);
 919         if (dev->buf_use) {
 920                 spin_unlock(&dev->buf_lock);
 921                 return -EBUSY;
 922         }
 923         atomic_inc(&dev->buf_alloc);
 924         spin_unlock(&dev->buf_lock);
 925 
 926         mutex_lock(&dev->struct_mutex);
 927         entry = &dma->bufs[order];
 928         if (entry->buf_count) {
 929                 mutex_unlock(&dev->struct_mutex);
 930                 atomic_dec(&dev->buf_alloc);
 931                 return -ENOMEM; /* May only call once for each order */
 932         }
 933 
 934         if (count < 0 || count > 4096) {
 935                 mutex_unlock(&dev->struct_mutex);
 936                 atomic_dec(&dev->buf_alloc);
 937                 return -EINVAL;
 938         }
 939 
 940         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
 941         if (!entry->buflist) {
 942                 mutex_unlock(&dev->struct_mutex);
 943                 atomic_dec(&dev->buf_alloc);
 944                 return -ENOMEM;
 945         }
 946 
 947         entry->seglist = kcalloc(count, sizeof(*entry->seglist), GFP_KERNEL);
 948         if (!entry->seglist) {
 949                 kfree(entry->buflist);
 950                 mutex_unlock(&dev->struct_mutex);
 951                 atomic_dec(&dev->buf_alloc);
 952                 return -ENOMEM;
 953         }
 954 
 955         /* Keep the original pagelist until we know all the allocations
 956          * have succeeded
 957          */
 958         temp_pagelist = kmalloc_array(dma->page_count + (count << page_order),
 959                                       sizeof(*dma->pagelist),
 960                                       GFP_KERNEL);
 961         if (!temp_pagelist) {
 962                 kfree(entry->buflist);
 963                 kfree(entry->seglist);
 964                 mutex_unlock(&dev->struct_mutex);
 965                 atomic_dec(&dev->buf_alloc);
 966                 return -ENOMEM;
 967         }
 968         memcpy(temp_pagelist,
 969                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 970         DRM_DEBUG("pagelist: %d entries\n",
 971                   dma->page_count + (count << page_order));
 972 
 973         entry->buf_size = size;
 974         entry->page_order = page_order;
 975         byte_count = 0;
 976         page_count = 0;
 977 
 978         while (entry->buf_count < count) {
 979 
 980                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 981 
 982                 if (!dmah) {
 983                         /* Set count correctly so we free the proper amount. */
 984                         entry->buf_count = count;
 985                         entry->seg_count = count;
 986                         drm_cleanup_buf_error(dev, entry);
 987                         kfree(temp_pagelist);
 988                         mutex_unlock(&dev->struct_mutex);
 989                         atomic_dec(&dev->buf_alloc);
 990                         return -ENOMEM;
 991                 }
 992                 entry->seglist[entry->seg_count++] = dmah;
 993                 for (i = 0; i < (1 << page_order); i++) {
 994                         DRM_DEBUG("page %d @ 0x%08lx\n",
 995                                   dma->page_count + page_count,
 996                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 997                         temp_pagelist[dma->page_count + page_count++]
 998                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 999                 }
1000                 for (offset = 0;
1001                      offset + size <= total && entry->buf_count < count;
1002                      offset += alignment, ++entry->buf_count) {
1003                         buf = &entry->buflist[entry->buf_count];
1004                         buf->idx = dma->buf_count + entry->buf_count;
1005                         buf->total = alignment;
1006                         buf->order = order;
1007                         buf->used = 0;
1008                         buf->offset = (dma->byte_count + byte_count + offset);
1009                         buf->address = (void *)(dmah->vaddr + offset);
1010                         buf->bus_address = dmah->busaddr + offset;
1011                         buf->next = NULL;
1012                         buf->waiting = 0;
1013                         buf->pending = 0;
1014                         buf->file_priv = NULL;
1015 
1016                         buf->dev_priv_size = dev->driver->dev_priv_size;
1017                         buf->dev_private = kzalloc(buf->dev_priv_size,
1018                                                 GFP_KERNEL);
1019                         if (!buf->dev_private) {
1020                                 /* Set count correctly so we free the proper amount. */
1021                                 entry->buf_count = count;
1022                                 entry->seg_count = count;
1023                                 drm_cleanup_buf_error(dev, entry);
1024                                 kfree(temp_pagelist);
1025                                 mutex_unlock(&dev->struct_mutex);
1026                                 atomic_dec(&dev->buf_alloc);
1027                                 return -ENOMEM;
1028                         }
1029 
1030                         DRM_DEBUG("buffer %d @ %p\n",
1031                                   entry->buf_count, buf->address);
1032                 }
1033                 byte_count += PAGE_SIZE << page_order;
1034         }
1035 
1036         temp_buflist = krealloc(dma->buflist,
1037                                 (dma->buf_count + entry->buf_count) *
1038                                 sizeof(*dma->buflist), GFP_KERNEL);
1039         if (!temp_buflist) {
1040                 /* Free the entry because it isn't valid */
1041                 drm_cleanup_buf_error(dev, entry);
1042                 kfree(temp_pagelist);
1043                 mutex_unlock(&dev->struct_mutex);
1044                 atomic_dec(&dev->buf_alloc);
1045                 return -ENOMEM;
1046         }
1047         dma->buflist = temp_buflist;
1048 
1049         for (i = 0; i < entry->buf_count; i++) {
1050                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1051         }
1052 
1053         /* No allocations failed, so now we can replace the original pagelist
1054          * with the new one.
1055          */
1056         if (dma->page_count) {
1057                 kfree(dma->pagelist);
1058         }
1059         dma->pagelist = temp_pagelist;
1060 
1061         dma->buf_count += entry->buf_count;
1062         dma->seg_count += entry->seg_count;
1063         dma->page_count += entry->seg_count << page_order;
1064         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
1065 
1066         mutex_unlock(&dev->struct_mutex);
1067 
1068         request->count = entry->buf_count;
1069         request->size = size;
1070 
1071         if (request->flags & _DRM_PCI_BUFFER_RO)
1072                 dma->flags = _DRM_DMA_USE_PCI_RO;
1073 
1074         atomic_dec(&dev->buf_alloc);
1075         return 0;
1076 
1077 }
1078 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
1079 
1080 static int drm_legacy_addbufs_sg(struct drm_device *dev,
1081                                  struct drm_buf_desc *request)
1082 {
1083         struct drm_device_dma *dma = dev->dma;
1084         struct drm_buf_entry *entry;
1085         struct drm_buf *buf;
1086         unsigned long offset;
1087         unsigned long agp_offset;
1088         int count;
1089         int order;
1090         int size;
1091         int alignment;
1092         int page_order;
1093         int total;
1094         int byte_count;
1095         int i;
1096         struct drm_buf **temp_buflist;
1097 
1098         if (!drm_core_check_feature(dev, DRIVER_SG))
1099                 return -EOPNOTSUPP;
1100 
1101         if (!dma)
1102                 return -EINVAL;
1103 
1104         if (!capable(CAP_SYS_ADMIN))
1105                 return -EPERM;
1106 
1107         count = request->count;
1108         order = order_base_2(request->size);
1109         size = 1 << order;
1110 
1111         alignment = (request->flags & _DRM_PAGE_ALIGN)
1112             ? PAGE_ALIGN(size) : size;
1113         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1114         total = PAGE_SIZE << page_order;
1115 
1116         byte_count = 0;
1117         agp_offset = request->agp_start;
1118 
1119         DRM_DEBUG("count:      %d\n", count);
1120         DRM_DEBUG("order:      %d\n", order);
1121         DRM_DEBUG("size:       %d\n", size);
1122         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1123         DRM_DEBUG("alignment:  %d\n", alignment);
1124         DRM_DEBUG("page_order: %d\n", page_order);
1125         DRM_DEBUG("total:      %d\n", total);
1126 
1127         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1128                 return -EINVAL;
1129 
1130         spin_lock(&dev->buf_lock);
1131         if (dev->buf_use) {
1132                 spin_unlock(&dev->buf_lock);
1133                 return -EBUSY;
1134         }
1135         atomic_inc(&dev->buf_alloc);
1136         spin_unlock(&dev->buf_lock);
1137 
1138         mutex_lock(&dev->struct_mutex);
1139         entry = &dma->bufs[order];
1140         if (entry->buf_count) {
1141                 mutex_unlock(&dev->struct_mutex);
1142                 atomic_dec(&dev->buf_alloc);
1143                 return -ENOMEM; /* May only call once for each order */
1144         }
1145 
1146         if (count < 0 || count > 4096) {
1147                 mutex_unlock(&dev->struct_mutex);
1148                 atomic_dec(&dev->buf_alloc);
1149                 return -EINVAL;
1150         }
1151 
1152         entry->buflist = kcalloc(count, sizeof(*entry->buflist), GFP_KERNEL);
1153         if (!entry->buflist) {
1154                 mutex_unlock(&dev->struct_mutex);
1155                 atomic_dec(&dev->buf_alloc);
1156                 return -ENOMEM;
1157         }
1158 
1159         entry->buf_size = size;
1160         entry->page_order = page_order;
1161 
1162         offset = 0;
1163 
1164         while (entry->buf_count < count) {
1165                 buf = &entry->buflist[entry->buf_count];
1166                 buf->idx = dma->buf_count + entry->buf_count;
1167                 buf->total = alignment;
1168                 buf->order = order;
1169                 buf->used = 0;
1170 
1171                 buf->offset = (dma->byte_count + offset);
1172                 buf->bus_address = agp_offset + offset;
1173                 buf->address = (void *)(agp_offset + offset
1174                                         + (unsigned long)dev->sg->virtual);
1175                 buf->next = NULL;
1176                 buf->waiting = 0;
1177                 buf->pending = 0;
1178                 buf->file_priv = NULL;
1179 
1180                 buf->dev_priv_size = dev->driver->dev_priv_size;
1181                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1182                 if (!buf->dev_private) {
1183                         /* Set count correctly so we free the proper amount. */
1184                         entry->buf_count = count;
1185                         drm_cleanup_buf_error(dev, entry);
1186                         mutex_unlock(&dev->struct_mutex);
1187                         atomic_dec(&dev->buf_alloc);
1188                         return -ENOMEM;
1189                 }
1190 
1191                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1192 
1193                 offset += alignment;
1194                 entry->buf_count++;
1195                 byte_count += PAGE_SIZE << page_order;
1196         }
1197 
1198         DRM_DEBUG("byte_count: %d\n", byte_count);
1199 
1200         temp_buflist = krealloc(dma->buflist,
1201                                 (dma->buf_count + entry->buf_count) *
1202                                 sizeof(*dma->buflist), GFP_KERNEL);
1203         if (!temp_buflist) {
1204                 /* Free the entry because it isn't valid */
1205                 drm_cleanup_buf_error(dev, entry);
1206                 mutex_unlock(&dev->struct_mutex);
1207                 atomic_dec(&dev->buf_alloc);
1208                 return -ENOMEM;
1209         }
1210         dma->buflist = temp_buflist;
1211 
1212         for (i = 0; i < entry->buf_count; i++) {
1213                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1214         }
1215 
1216         dma->buf_count += entry->buf_count;
1217         dma->seg_count += entry->seg_count;
1218         dma->page_count += byte_count >> PAGE_SHIFT;
1219         dma->byte_count += byte_count;
1220 
1221         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1222         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1223 
1224         mutex_unlock(&dev->struct_mutex);
1225 
1226         request->count = entry->buf_count;
1227         request->size = size;
1228 
1229         dma->flags = _DRM_DMA_USE_SG;
1230 
1231         atomic_dec(&dev->buf_alloc);
1232         return 0;
1233 }
1234 
1235 /**
1236  * Add buffers for DMA transfers (ioctl).
1237  *
1238  * \param inode device inode.
1239  * \param file_priv DRM file private.
1240  * \param cmd command.
1241  * \param arg pointer to a struct drm_buf_desc request.
1242  * \return zero on success or a negative number on failure.
1243  *
1244  * According with the memory type specified in drm_buf_desc::flags and the
1245  * build options, it dispatches the call either to addbufs_agp(),
1246  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1247  * PCI memory respectively.
1248  */
1249 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1250                        struct drm_file *file_priv)
1251 {
1252         struct drm_buf_desc *request = data;
1253         int ret;
1254 
1255         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1256                 return -EOPNOTSUPP;
1257 
1258         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1259                 return -EOPNOTSUPP;
1260 
1261 #if IS_ENABLED(CONFIG_AGP)
1262         if (request->flags & _DRM_AGP_BUFFER)
1263                 ret = drm_legacy_addbufs_agp(dev, request);
1264         else
1265 #endif
1266         if (request->flags & _DRM_SG_BUFFER)
1267                 ret = drm_legacy_addbufs_sg(dev, request);
1268         else if (request->flags & _DRM_FB_BUFFER)
1269                 ret = -EINVAL;
1270         else
1271                 ret = drm_legacy_addbufs_pci(dev, request);
1272 
1273         return ret;
1274 }
1275 
1276 /**
1277  * Get information about the buffer mappings.
1278  *
1279  * This was originally mean for debugging purposes, or by a sophisticated
1280  * client library to determine how best to use the available buffers (e.g.,
1281  * large buffers can be used for image transfer).
1282  *
1283  * \param inode device inode.
1284  * \param file_priv DRM file private.
1285  * \param cmd command.
1286  * \param arg pointer to a drm_buf_info structure.
1287  * \return zero on success or a negative number on failure.
1288  *
1289  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1290  * lock, preventing of allocating more buffers after this call. Information
1291  * about each requested buffer is then copied into user space.
1292  */
1293 int __drm_legacy_infobufs(struct drm_device *dev,
1294                         void *data, int *p,
1295                         int (*f)(void *, int, struct drm_buf_entry *))
1296 {
1297         struct drm_device_dma *dma = dev->dma;
1298         int i;
1299         int count;
1300 
1301         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1302                 return -EOPNOTSUPP;
1303 
1304         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1305                 return -EOPNOTSUPP;
1306 
1307         if (!dma)
1308                 return -EINVAL;
1309 
1310         spin_lock(&dev->buf_lock);
1311         if (atomic_read(&dev->buf_alloc)) {
1312                 spin_unlock(&dev->buf_lock);
1313                 return -EBUSY;
1314         }
1315         ++dev->buf_use;         /* Can't allocate more after this call */
1316         spin_unlock(&dev->buf_lock);
1317 
1318         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1319                 if (dma->bufs[i].buf_count)
1320                         ++count;
1321         }
1322 
1323         DRM_DEBUG("count = %d\n", count);
1324 
1325         if (*p >= count) {
1326                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1327                         struct drm_buf_entry *from = &dma->bufs[i];
1328                         if (from->buf_count) {
1329                                 if (f(data, count, from) < 0)
1330                                         return -EFAULT;
1331                                 DRM_DEBUG("%d %d %d %d %d\n",
1332                                           i,
1333                                           dma->bufs[i].buf_count,
1334                                           dma->bufs[i].buf_size,
1335                                           dma->bufs[i].low_mark,
1336                                           dma->bufs[i].high_mark);
1337                                 ++count;
1338                         }
1339                 }
1340         }
1341         *p = count;
1342 
1343         return 0;
1344 }
1345 
1346 static int copy_one_buf(void *data, int count, struct drm_buf_entry *from)
1347 {
1348         struct drm_buf_info *request = data;
1349         struct drm_buf_desc __user *to = &request->list[count];
1350         struct drm_buf_desc v = {.count = from->buf_count,
1351                                  .size = from->buf_size,
1352                                  .low_mark = from->low_mark,
1353                                  .high_mark = from->high_mark};
1354 
1355         if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)))
1356                 return -EFAULT;
1357         return 0;
1358 }
1359 
1360 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1361                         struct drm_file *file_priv)
1362 {
1363         struct drm_buf_info *request = data;
1364         return __drm_legacy_infobufs(dev, data, &request->count, copy_one_buf);
1365 }
1366 
1367 /**
1368  * Specifies a low and high water mark for buffer allocation
1369  *
1370  * \param inode device inode.
1371  * \param file_priv DRM file private.
1372  * \param cmd command.
1373  * \param arg a pointer to a drm_buf_desc structure.
1374  * \return zero on success or a negative number on failure.
1375  *
1376  * Verifies that the size order is bounded between the admissible orders and
1377  * updates the respective drm_device_dma::bufs entry low and high water mark.
1378  *
1379  * \note This ioctl is deprecated and mostly never used.
1380  */
1381 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1382                         struct drm_file *file_priv)
1383 {
1384         struct drm_device_dma *dma = dev->dma;
1385         struct drm_buf_desc *request = data;
1386         int order;
1387         struct drm_buf_entry *entry;
1388 
1389         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1390                 return -EOPNOTSUPP;
1391 
1392         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1393                 return -EOPNOTSUPP;
1394 
1395         if (!dma)
1396                 return -EINVAL;
1397 
1398         DRM_DEBUG("%d, %d, %d\n",
1399                   request->size, request->low_mark, request->high_mark);
1400         order = order_base_2(request->size);
1401         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1402                 return -EINVAL;
1403         entry = &dma->bufs[order];
1404 
1405         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1406                 return -EINVAL;
1407         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1408                 return -EINVAL;
1409 
1410         entry->low_mark = request->low_mark;
1411         entry->high_mark = request->high_mark;
1412 
1413         return 0;
1414 }
1415 
1416 /**
1417  * Unreserve the buffers in list, previously reserved using drmDMA.
1418  *
1419  * \param inode device inode.
1420  * \param file_priv DRM file private.
1421  * \param cmd command.
1422  * \param arg pointer to a drm_buf_free structure.
1423  * \return zero on success or a negative number on failure.
1424  *
1425  * Calls free_buffer() for each used buffer.
1426  * This function is primarily used for debugging.
1427  */
1428 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1429                         struct drm_file *file_priv)
1430 {
1431         struct drm_device_dma *dma = dev->dma;
1432         struct drm_buf_free *request = data;
1433         int i;
1434         int idx;
1435         struct drm_buf *buf;
1436 
1437         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1438                 return -EOPNOTSUPP;
1439 
1440         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1441                 return -EOPNOTSUPP;
1442 
1443         if (!dma)
1444                 return -EINVAL;
1445 
1446         DRM_DEBUG("%d\n", request->count);
1447         for (i = 0; i < request->count; i++) {
1448                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1449                         return -EFAULT;
1450                 if (idx < 0 || idx >= dma->buf_count) {
1451                         DRM_ERROR("Index %d (of %d max)\n",
1452                                   idx, dma->buf_count - 1);
1453                         return -EINVAL;
1454                 }
1455                 idx = array_index_nospec(idx, dma->buf_count);
1456                 buf = dma->buflist[idx];
1457                 if (buf->file_priv != file_priv) {
1458                         DRM_ERROR("Process %d freeing buffer not owned\n",
1459                                   task_pid_nr(current));
1460                         return -EINVAL;
1461                 }
1462                 drm_legacy_free_buffer(dev, buf);
1463         }
1464 
1465         return 0;
1466 }
1467 
1468 /**
1469  * Maps all of the DMA buffers into client-virtual space (ioctl).
1470  *
1471  * \param inode device inode.
1472  * \param file_priv DRM file private.
1473  * \param cmd command.
1474  * \param arg pointer to a drm_buf_map structure.
1475  * \return zero on success or a negative number on failure.
1476  *
1477  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1478  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1479  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1480  * drm_mmap_dma().
1481  */
1482 int __drm_legacy_mapbufs(struct drm_device *dev, void *data, int *p,
1483                          void __user **v,
1484                          int (*f)(void *, int, unsigned long,
1485                                  struct drm_buf *),
1486                                  struct drm_file *file_priv)
1487 {
1488         struct drm_device_dma *dma = dev->dma;
1489         int retcode = 0;
1490         unsigned long virtual;
1491         int i;
1492 
1493         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1494                 return -EOPNOTSUPP;
1495 
1496         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1497                 return -EOPNOTSUPP;
1498 
1499         if (!dma)
1500                 return -EINVAL;
1501 
1502         spin_lock(&dev->buf_lock);
1503         if (atomic_read(&dev->buf_alloc)) {
1504                 spin_unlock(&dev->buf_lock);
1505                 return -EBUSY;
1506         }
1507         dev->buf_use++;         /* Can't allocate more after this call */
1508         spin_unlock(&dev->buf_lock);
1509 
1510         if (*p >= dma->buf_count) {
1511                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1512                     || (drm_core_check_feature(dev, DRIVER_SG)
1513                         && (dma->flags & _DRM_DMA_USE_SG))) {
1514                         struct drm_local_map *map = dev->agp_buffer_map;
1515                         unsigned long token = dev->agp_buffer_token;
1516 
1517                         if (!map) {
1518                                 retcode = -EINVAL;
1519                                 goto done;
1520                         }
1521                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1522                                           PROT_READ | PROT_WRITE,
1523                                           MAP_SHARED,
1524                                           token);
1525                 } else {
1526                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1527                                           PROT_READ | PROT_WRITE,
1528                                           MAP_SHARED, 0);
1529                 }
1530                 if (virtual > -1024UL) {
1531                         /* Real error */
1532                         retcode = (signed long)virtual;
1533                         goto done;
1534                 }
1535                 *v = (void __user *)virtual;
1536 
1537                 for (i = 0; i < dma->buf_count; i++) {
1538                         if (f(data, i, virtual, dma->buflist[i]) < 0) {
1539                                 retcode = -EFAULT;
1540                                 goto done;
1541                         }
1542                 }
1543         }
1544       done:
1545         *p = dma->buf_count;
1546         DRM_DEBUG("%d buffers, retcode = %d\n", *p, retcode);
1547 
1548         return retcode;
1549 }
1550 
1551 static int map_one_buf(void *data, int idx, unsigned long virtual,
1552                         struct drm_buf *buf)
1553 {
1554         struct drm_buf_map *request = data;
1555         unsigned long address = virtual + buf->offset;  /* *** */
1556 
1557         if (copy_to_user(&request->list[idx].idx, &buf->idx,
1558                          sizeof(request->list[0].idx)))
1559                 return -EFAULT;
1560         if (copy_to_user(&request->list[idx].total, &buf->total,
1561                          sizeof(request->list[0].total)))
1562                 return -EFAULT;
1563         if (clear_user(&request->list[idx].used, sizeof(int)))
1564                 return -EFAULT;
1565         if (copy_to_user(&request->list[idx].address, &address,
1566                          sizeof(address)))
1567                 return -EFAULT;
1568         return 0;
1569 }
1570 
1571 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1572                        struct drm_file *file_priv)
1573 {
1574         struct drm_buf_map *request = data;
1575         return __drm_legacy_mapbufs(dev, data, &request->count,
1576                                     &request->virtual, map_one_buf,
1577                                     file_priv);
1578 }
1579 
1580 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1581                   struct drm_file *file_priv)
1582 {
1583         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
1584                 return -EOPNOTSUPP;
1585 
1586         if (dev->driver->dma_ioctl)
1587                 return dev->driver->dma_ioctl(dev, data, file_priv);
1588         else
1589                 return -EINVAL;
1590 }
1591 
1592 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1593 {
1594         struct drm_map_list *entry;
1595 
1596         list_for_each_entry(entry, &dev->maplist, head) {
1597                 if (entry->map && entry->map->type == _DRM_SHM &&
1598                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1599                         return entry->map;
1600                 }
1601         }
1602         return NULL;
1603 }
1604 EXPORT_SYMBOL(drm_legacy_getsarea);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/gpu/drm/drm_bufs.c

DEFINITIONS
