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/vmalloc.h>
  32 #include <linux/slab.h>
  33 #include <linux/log2.h>
  34 #include <linux/export.h>
  35 #include <asm/shmparam.h>
  36 #include <drm/drmP.h>
  37 #include "drm_legacy.h"
  38
  39 #include <linux/nospec.h>
  40
  41 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  42                                                   struct drm_local_map *map)
  43 {
  44         struct drm_map_list *entry;
  45         list_for_each_entry(entry, &dev->maplist, head) {
  46                 /*
  47                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  48                  * while PCI resources may live above that, we only compare the
  49                  * lower 32 bits of the map offset for maps of type
  50                  * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  51                  * It is assumed that if a driver have more than one resource
  52                  * of each type, the lower 32 bits are different.
  53                  */
  54                 if (!entry->map ||
  55                     map->type != entry->map->type ||
  56                     entry->master != dev->primary->master)
  57                         continue;
  58                 switch (map->type) {
  59                 case _DRM_SHM:
  60                         if (map->flags != _DRM_CONTAINS_LOCK)
  61                                 break;
  62                         return entry;
  63                 case _DRM_REGISTERS:
  64                 case _DRM_FRAME_BUFFER:
  65                         if ((entry->map->offset & 0xffffffff) ==
  66                             (map->offset & 0xffffffff))
  67                                 return entry;
  68                 default: /* Make gcc happy */
  69                         ;
  70                 }
  71                 if (entry->map->offset == map->offset)
  72                         return entry;
  73         }
  74
  75         return NULL;
  76 }
  77
  78 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  79                           unsigned long user_token, int hashed_handle, int shm)
  80 {
  81         int use_hashed_handle, shift;
  82         unsigned long add;
  83
  84 #if (BITS_PER_LONG == 64)
  85         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  86 #elif (BITS_PER_LONG == 32)
  87         use_hashed_handle = hashed_handle;
  88 #else
  89 #error Unsupported long size. Neither 64 nor 32 bits.
  90 #endif
  91
  92         if (!use_hashed_handle) {
  93                 int ret;
  94                 hash->key = user_token >> PAGE_SHIFT;
  95                 ret = drm_ht_insert_item(&dev->map_hash, hash);
  96                 if (ret != -EINVAL)
  97                         return ret;
  98         }
  99
 100         shift = 0;
 101         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 102         if (shm && (SHMLBA > PAGE_SIZE)) {
 103                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 104
 105                 /* For shared memory, we have to preserve the SHMLBA
 106                  * bits of the eventual vma->vm_pgoff value during
 107                  * mmap().  Otherwise we run into cache aliasing problems
 108                  * on some platforms.  On these platforms, the pgoff of
 109                  * a mmap() request is used to pick a suitable virtual
 110                  * address for the mmap() region such that it will not
 111                  * cause cache aliasing problems.
 112                  *
 113                  * Therefore, make sure the SHMLBA relevant bits of the
 114                  * hash value we use are equal to those in the original
 115                  * kernel virtual address.
 116                  */
 117                 shift = bits;
 118                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 119         }
 120
 121         return drm_ht_just_insert_please(&dev->map_hash, hash,
 122                                          user_token, 32 - PAGE_SHIFT - 3,
 123                                          shift, add);
 124 }
 125
 126 /**
 127  * Core function to create a range of memory available for mapping by a
 128  * non-root process.
 129  *
 130  * Adjusts the memory offset to its absolute value according to the mapping
 131  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 132  * applicable and if supported by the kernel.
 133  */
 134 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 135                            unsigned int size, enum drm_map_type type,
 136                            enum drm_map_flags flags,
 137                            struct drm_map_list ** maplist)
 138 {
 139         struct drm_local_map *map;
 140         struct drm_map_list *list;
 141         drm_dma_handle_t *dmah;
 142         unsigned long user_token;
 143         int ret;
 144
 145         map = kmalloc(sizeof(*map), GFP_KERNEL);
 146         if (!map)
 147                 return -ENOMEM;
 148
 149         map->offset = offset;
 150         map->size = size;
 151         map->flags = flags;
 152         map->type = type;
 153
 154         /* Only allow shared memory to be removable since we only keep enough
 155          * book keeping information about shared memory to allow for removal
 156          * when processes fork.
 157          */
 158         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 159                 kfree(map);
 160                 return -EINVAL;
 161         }
 162         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 163                   (unsigned long long)map->offset, map->size, map->type);
 164
 165         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 166          * hole created by that and it works around various broken drivers that use
 167          * a non-aligned quantity to map the SAREA. --BenH
 168          */
 169         if (map->type == _DRM_SHM)
 170                 map->size = PAGE_ALIGN(map->size);
 171
 172         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 173                 kfree(map);
 174                 return -EINVAL;
 175         }
 176         map->mtrr = -1;
 177         map->handle = NULL;
 178
 179         switch (map->type) {
 180         case _DRM_REGISTERS:
 181         case _DRM_FRAME_BUFFER:
 182 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 183                 if (map->offset + (map->size-1) < map->offset ||
 184                     map->offset < virt_to_phys(high_memory)) {
 185                         kfree(map);
 186                         return -EINVAL;
 187                 }
 188 #endif
 189                 /* Some drivers preinitialize some maps, without the X Server
 190                  * needing to be aware of it.  Therefore, we just return success
 191                  * when the server tries to create a duplicate map.
 192                  */
 193                 list = drm_find_matching_map(dev, map);
 194                 if (list != NULL) {
 195                         if (list->map->size != map->size) {
 196                                 DRM_DEBUG("Matching maps of type %d with "
 197                                           "mismatched sizes, (%ld vs %ld)\n",
 198                                           map->type, map->size,
 199                                           list->map->size);
 200                                 list->map->size = map->size;
 201                         }
 202
 203                         kfree(map);
 204                         *maplist = list;
 205                         return 0;
 206                 }
 207
 208                 if (map->type == _DRM_FRAME_BUFFER ||
 209                     (map->flags & _DRM_WRITE_COMBINING)) {
 210                         map->mtrr =
 211                                 arch_phys_wc_add(map->offset, map->size);
 212                 }
 213                 if (map->type == _DRM_REGISTERS) {
 214                         if (map->flags & _DRM_WRITE_COMBINING)
 215                                 map->handle = ioremap_wc(map->offset,
 216                                                          map->size);
 217                         else
 218                                 map->handle = ioremap(map->offset, map->size);
 219                         if (!map->handle) {
 220                                 kfree(map);
 221                                 return -ENOMEM;
 222                         }
 223                 }
 224
 225                 break;
 226         case _DRM_SHM:
 227                 list = drm_find_matching_map(dev, map);
 228                 if (list != NULL) {
 229                         if(list->map->size != map->size) {
 230                                 DRM_DEBUG("Matching maps of type %d with "
 231                                           "mismatched sizes, (%ld vs %ld)\n",
 232                                           map->type, map->size, list->map->size);
 233                                 list->map->size = map->size;
 234                         }
 235
 236                         kfree(map);
 237                         *maplist = list;
 238                         return 0;
 239                 }
 240                 map->handle = vmalloc_user(map->size);
 241                 DRM_DEBUG("%lu %d %p\n",
 242                           map->size, order_base_2(map->size), map->handle);
 243                 if (!map->handle) {
 244                         kfree(map);
 245                         return -ENOMEM;
 246                 }
 247                 map->offset = (unsigned long)map->handle;
 248                 if (map->flags & _DRM_CONTAINS_LOCK) {
 249                         /* Prevent a 2nd X Server from creating a 2nd lock */
 250                         if (dev->primary->master->lock.hw_lock != NULL) {
 251                                 vfree(map->handle);
 252                                 kfree(map);
 253                                 return -EBUSY;
 254                         }
 255                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 256                 }
 257                 break;
 258         case _DRM_AGP: {
 259                 struct drm_agp_mem *entry;
 260                 int valid = 0;
 261
 262                 if (!dev->agp) {
 263                         kfree(map);
 264                         return -EINVAL;
 265                 }
 266 #ifdef __alpha__
 267                 map->offset += dev->hose->mem_space->start;
 268 #endif
 269                 /* In some cases (i810 driver), user space may have already
 270                  * added the AGP base itself, because dev->agp->base previously
 271                  * only got set during AGP enable.  So, only add the base
 272                  * address if the map's offset isn't already within the
 273                  * aperture.
 274                  */
 275                 if (map->offset < dev->agp->base ||
 276                     map->offset > dev->agp->base +
 277                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 278                         map->offset += dev->agp->base;
 279                 }
 280                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 281
 282                 /* This assumes the DRM is in total control of AGP space.
 283                  * It's not always the case as AGP can be in the control
 284                  * of user space (i.e. i810 driver). So this loop will get
 285                  * skipped and we double check that dev->agp->memory is
 286                  * actually set as well as being invalid before EPERM'ing
 287                  */
 288                 list_for_each_entry(entry, &dev->agp->memory, head) {
 289                         if ((map->offset >= entry->bound) &&
 290                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 291                                 valid = 1;
 292                                 break;
 293                         }
 294                 }
 295                 if (!list_empty(&dev->agp->memory) && !valid) {
 296                         kfree(map);
 297                         return -EPERM;
 298                 }
 299                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 300                           (unsigned long long)map->offset, map->size);
 301
 302                 break;
 303         }
 304         case _DRM_SCATTER_GATHER:
 305                 if (!dev->sg) {
 306                         kfree(map);
 307                         return -EINVAL;
 308                 }
 309                 map->offset += (unsigned long)dev->sg->virtual;
 310                 break;
 311         case _DRM_CONSISTENT:
 312                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 313                  * As we're limiting the address to 2^32-1 (or less),
 314                  * casting it down to 32 bits is no problem, but we
 315                  * need to point to a 64bit variable first. */
 316                 dmah = drm_pci_alloc(dev, map->size, map->size);
 317                 if (!dmah) {
 318                         kfree(map);
 319                         return -ENOMEM;
 320                 }
 321                 map->handle = dmah->vaddr;
 322                 map->offset = (unsigned long)dmah->busaddr;
 323                 kfree(dmah);
 324                 break;
 325         default:
 326                 kfree(map);
 327                 return -EINVAL;
 328         }
 329
 330         list = kzalloc(sizeof(*list), GFP_KERNEL);
 331         if (!list) {
 332                 if (map->type == _DRM_REGISTERS)
 333                         iounmap(map->handle);
 334                 kfree(map);
 335                 return -EINVAL;
 336         }
 337         list->map = map;
 338
 339         mutex_lock(&dev->struct_mutex);
 340         list_add(&list->head, &dev->maplist);
 341
 342         /* Assign a 32-bit handle */
 343         /* We do it here so that dev->struct_mutex protects the increment */
 344         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 345                 map->offset;
 346         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 347                              (map->type == _DRM_SHM));
 348         if (ret) {
 349                 if (map->type == _DRM_REGISTERS)
 350                         iounmap(map->handle);
 351                 kfree(map);
 352                 kfree(list);
 353                 mutex_unlock(&dev->struct_mutex);
 354                 return ret;
 355         }
 356
 357         list->user_token = list->hash.key << PAGE_SHIFT;
 358         mutex_unlock(&dev->struct_mutex);
 359
 360         if (!(map->flags & _DRM_DRIVER))
 361                 list->master = dev->primary->master;
 362         *maplist = list;
 363         return 0;
 364 }
 365
 366 int drm_legacy_addmap(struct drm_device * dev, resource_size_t offset,
 367                       unsigned int size, enum drm_map_type type,
 368                       enum drm_map_flags flags, struct drm_local_map **map_ptr)
 369 {
 370         struct drm_map_list *list;
 371         int rc;
 372
 373         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 374         if (!rc)
 375                 *map_ptr = list->map;
 376         return rc;
 377 }
 378 EXPORT_SYMBOL(drm_legacy_addmap);
 379
 380 /**
 381  * Ioctl to specify a range of memory that is available for mapping by a
 382  * non-root process.
 383  *
 384  * \param inode device inode.
 385  * \param file_priv DRM file private.
 386  * \param cmd command.
 387  * \param arg pointer to a drm_map structure.
 388  * \return zero on success or a negative value on error.
 389  *
 390  */
 391 int drm_legacy_addmap_ioctl(struct drm_device *dev, void *data,
 392                             struct drm_file *file_priv)
 393 {
 394         struct drm_map *map = data;
 395         struct drm_map_list *maplist;
 396         int err;
 397
 398         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 399                 return -EPERM;
 400
 401         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 402                               map->flags, &maplist);
 403
 404         if (err)
 405                 return err;
 406
 407         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 408         map->handle = (void *)(unsigned long)maplist->user_token;
 409
 410         /*
 411          * It appears that there are no users of this value whatsoever --
 412          * drmAddMap just discards it.  Let's not encourage its use.
 413          * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 414          *  it's not a real mtrr index anymore.)
 415          */
 416         map->mtrr = -1;
 417
 418         return 0;
 419 }
 420
 421 /**
 422  * Remove a map private from list and deallocate resources if the mapping
 423  * isn't in use.
 424  *
 425  * Searches the map on drm_device::maplist, removes it from the list, see if
 426  * its being used, and free any associate resource (such as MTRR's) if it's not
 427  * being on use.
 428  *
 429  * \sa drm_legacy_addmap
 430  */
 431 int drm_legacy_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 432 {
 433         struct drm_map_list *r_list = NULL, *list_t;
 434         drm_dma_handle_t dmah;
 435         int found = 0;
 436         struct drm_master *master;
 437
 438         /* Find the list entry for the map and remove it */
 439         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 440                 if (r_list->map == map) {
 441                         master = r_list->master;
 442                         list_del(&r_list->head);
 443                         drm_ht_remove_key(&dev->map_hash,
 444                                           r_list->user_token >> PAGE_SHIFT);
 445                         kfree(r_list);
 446                         found = 1;
 447                         break;
 448                 }
 449         }
 450
 451         if (!found)
 452                 return -EINVAL;
 453
 454         switch (map->type) {
 455         case _DRM_REGISTERS:
 456                 iounmap(map->handle);
 457                 /* FALLTHROUGH */
 458         case _DRM_FRAME_BUFFER:
 459                 arch_phys_wc_del(map->mtrr);
 460                 break;
 461         case _DRM_SHM:
 462                 vfree(map->handle);
 463                 if (master) {
 464                         if (dev->sigdata.lock == master->lock.hw_lock)
 465                                 dev->sigdata.lock = NULL;
 466                         master->lock.hw_lock = NULL;   /* SHM removed */
 467                         master->lock.file_priv = NULL;
 468                         wake_up_interruptible_all(&master->lock.lock_queue);
 469                 }
 470                 break;
 471         case _DRM_AGP:
 472         case _DRM_SCATTER_GATHER:
 473                 break;
 474         case _DRM_CONSISTENT:
 475                 dmah.vaddr = map->handle;
 476                 dmah.busaddr = map->offset;
 477                 dmah.size = map->size;
 478                 __drm_legacy_pci_free(dev, &dmah);
 479                 break;
 480         }
 481         kfree(map);
 482
 483         return 0;
 484 }
 485 EXPORT_SYMBOL(drm_legacy_rmmap_locked);
 486
 487 int drm_legacy_rmmap(struct drm_device *dev, struct drm_local_map *map)
 488 {
 489         int ret;
 490
 491         mutex_lock(&dev->struct_mutex);
 492         ret = drm_legacy_rmmap_locked(dev, map);
 493         mutex_unlock(&dev->struct_mutex);
 494
 495         return ret;
 496 }
 497 EXPORT_SYMBOL(drm_legacy_rmmap);
 498
 499 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 500  * the last close of the device, and this is necessary for cleanup when things
 501  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 502  * like a pointless exercise since they're going away anyway.
 503  *
 504  * One use case might be after addmap is allowed for normal users for SHM and
 505  * gets used by drivers that the server doesn't need to care about.  This seems
 506  * unlikely.
 507  *
 508  * \param inode device inode.
 509  * \param file_priv DRM file private.
 510  * \param cmd command.
 511  * \param arg pointer to a struct drm_map structure.
 512  * \return zero on success or a negative value on error.
 513  */
 514 int drm_legacy_rmmap_ioctl(struct drm_device *dev, void *data,
 515                            struct drm_file *file_priv)
 516 {
 517         struct drm_map *request = data;
 518         struct drm_local_map *map = NULL;
 519         struct drm_map_list *r_list;
 520         int ret;
 521
 522         mutex_lock(&dev->struct_mutex);
 523         list_for_each_entry(r_list, &dev->maplist, head) {
 524                 if (r_list->map &&
 525                     r_list->user_token == (unsigned long)request->handle &&
 526                     r_list->map->flags & _DRM_REMOVABLE) {
 527                         map = r_list->map;
 528                         break;
 529                 }
 530         }
 531
 532         /* List has wrapped around to the head pointer, or its empty we didn't
 533          * find anything.
 534          */
 535         if (list_empty(&dev->maplist) || !map) {
 536                 mutex_unlock(&dev->struct_mutex);
 537                 return -EINVAL;
 538         }
 539
 540         /* Register and framebuffer maps are permanent */
 541         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 542                 mutex_unlock(&dev->struct_mutex);
 543                 return 0;
 544         }
 545
 546         ret = drm_legacy_rmmap_locked(dev, map);
 547
 548         mutex_unlock(&dev->struct_mutex);
 549
 550         return ret;
 551 }
 552
 553 /**
 554  * Cleanup after an error on one of the addbufs() functions.
 555  *
 556  * \param dev DRM device.
 557  * \param entry buffer entry where the error occurred.
 558  *
 559  * Frees any pages and buffers associated with the given entry.
 560  */
 561 static void drm_cleanup_buf_error(struct drm_device * dev,
 562                                   struct drm_buf_entry * entry)
 563 {
 564         int i;
 565
 566         if (entry->seg_count) {
 567                 for (i = 0; i < entry->seg_count; i++) {
 568                         if (entry->seglist[i]) {
 569                                 drm_pci_free(dev, entry->seglist[i]);
 570                         }
 571                 }
 572                 kfree(entry->seglist);
 573
 574                 entry->seg_count = 0;
 575         }
 576
 577         if (entry->buf_count) {
 578                 for (i = 0; i < entry->buf_count; i++) {
 579                         kfree(entry->buflist[i].dev_private);
 580                 }
 581                 kfree(entry->buflist);
 582
 583                 entry->buf_count = 0;
 584         }
 585 }
 586
 587 #if IS_ENABLED(CONFIG_AGP)
 588 /**
 589  * Add AGP buffers for DMA transfers.
 590  *
 591  * \param dev struct drm_device to which the buffers are to be added.
 592  * \param request pointer to a struct drm_buf_desc describing the request.
 593  * \return zero on success or a negative number on failure.
 594  *
 595  * After some sanity checks creates a drm_buf structure for each buffer and
 596  * reallocates the buffer list of the same size order to accommodate the new
 597  * buffers.
 598  */
 599 int drm_legacy_addbufs_agp(struct drm_device *dev,
 600                            struct drm_buf_desc *request)
 601 {
 602         struct drm_device_dma *dma = dev->dma;
 603         struct drm_buf_entry *entry;
 604         struct drm_agp_mem *agp_entry;
 605         struct drm_buf *buf;
 606         unsigned long offset;
 607         unsigned long agp_offset;
 608         int count;
 609         int order;
 610         int size;
 611         int alignment;
 612         int page_order;
 613         int total;
 614         int byte_count;
 615         int i, valid;
 616         struct drm_buf **temp_buflist;
 617
 618         if (!dma)
 619                 return -EINVAL;
 620
 621         count = request->count;
 622         order = order_base_2(request->size);
 623         size = 1 << order;
 624
 625         alignment = (request->flags & _DRM_PAGE_ALIGN)
 626             ? PAGE_ALIGN(size) : size;
 627         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 628         total = PAGE_SIZE << page_order;
 629
 630         byte_count = 0;
 631         agp_offset = dev->agp->base + request->agp_start;
 632
 633         DRM_DEBUG("count:      %d\n", count);
 634         DRM_DEBUG("order:      %d\n", order);
 635         DRM_DEBUG("size:       %d\n", size);
 636         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 637         DRM_DEBUG("alignment:  %d\n", alignment);
 638         DRM_DEBUG("page_order: %d\n", page_order);
 639         DRM_DEBUG("total:      %d\n", total);
 640
 641         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 642                 return -EINVAL;
 643
 644         /* Make sure buffers are located in AGP memory that we own */
 645         valid = 0;
 646         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 647                 if ((agp_offset >= agp_entry->bound) &&
 648                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 649                         valid = 1;
 650                         break;
 651                 }
 652         }
 653         if (!list_empty(&dev->agp->memory) && !valid) {
 654                 DRM_DEBUG("zone invalid\n");
 655                 return -EINVAL;
 656         }
 657         spin_lock(&dev->buf_lock);
 658         if (dev->buf_use) {
 659                 spin_unlock(&dev->buf_lock);
 660                 return -EBUSY;
 661         }
 662         atomic_inc(&dev->buf_alloc);
 663         spin_unlock(&dev->buf_lock);
 664
 665         mutex_lock(&dev->struct_mutex);
 666         entry = &dma->bufs[order];
 667         if (entry->buf_count) {
 668                 mutex_unlock(&dev->struct_mutex);
 669                 atomic_dec(&dev->buf_alloc);
 670                 return -ENOMEM; /* May only call once for each order */
 671         }
 672
 673         if (count < 0 || count > 4096) {
 674                 mutex_unlock(&dev->struct_mutex);
 675                 atomic_dec(&dev->buf_alloc);
 676                 return -EINVAL;
 677         }
 678
 679         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 680         if (!entry->buflist) {
 681                 mutex_unlock(&dev->struct_mutex);
 682                 atomic_dec(&dev->buf_alloc);
 683                 return -ENOMEM;
 684         }
 685
 686         entry->buf_size = size;
 687         entry->page_order = page_order;
 688
 689         offset = 0;
 690
 691         while (entry->buf_count < count) {
 692                 buf = &entry->buflist[entry->buf_count];
 693                 buf->idx = dma->buf_count + entry->buf_count;
 694                 buf->total = alignment;
 695                 buf->order = order;
 696                 buf->used = 0;
 697
 698                 buf->offset = (dma->byte_count + offset);
 699                 buf->bus_address = agp_offset + offset;
 700                 buf->address = (void *)(agp_offset + offset);
 701                 buf->next = NULL;
 702                 buf->waiting = 0;
 703                 buf->pending = 0;
 704                 buf->file_priv = NULL;
 705
 706                 buf->dev_priv_size = dev->driver->dev_priv_size;
 707                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 708                 if (!buf->dev_private) {
 709                         /* Set count correctly so we free the proper amount. */
 710                         entry->buf_count = count;
 711                         drm_cleanup_buf_error(dev, entry);
 712                         mutex_unlock(&dev->struct_mutex);
 713                         atomic_dec(&dev->buf_alloc);
 714                         return -ENOMEM;
 715                 }
 716
 717                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 718
 719                 offset += alignment;
 720                 entry->buf_count++;
 721                 byte_count += PAGE_SIZE << page_order;
 722         }
 723
 724         DRM_DEBUG("byte_count: %d\n", byte_count);
 725
 726         temp_buflist = krealloc(dma->buflist,
 727                                 (dma->buf_count + entry->buf_count) *
 728                                 sizeof(*dma->buflist), GFP_KERNEL);
 729         if (!temp_buflist) {
 730                 /* Free the entry because it isn't valid */
 731                 drm_cleanup_buf_error(dev, entry);
 732                 mutex_unlock(&dev->struct_mutex);
 733                 atomic_dec(&dev->buf_alloc);
 734                 return -ENOMEM;
 735         }
 736         dma->buflist = temp_buflist;
 737
 738         for (i = 0; i < entry->buf_count; i++) {
 739                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 740         }
 741
 742         dma->buf_count += entry->buf_count;
 743         dma->seg_count += entry->seg_count;
 744         dma->page_count += byte_count >> PAGE_SHIFT;
 745         dma->byte_count += byte_count;
 746
 747         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 748         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 749
 750         mutex_unlock(&dev->struct_mutex);
 751
 752         request->count = entry->buf_count;
 753         request->size = size;
 754
 755         dma->flags = _DRM_DMA_USE_AGP;
 756
 757         atomic_dec(&dev->buf_alloc);
 758         return 0;
 759 }
 760 EXPORT_SYMBOL(drm_legacy_addbufs_agp);
 761 #endif /* CONFIG_AGP */
 762
 763 int drm_legacy_addbufs_pci(struct drm_device *dev,
 764                            struct drm_buf_desc *request)
 765 {
 766         struct drm_device_dma *dma = dev->dma;
 767         int count;
 768         int order;
 769         int size;
 770         int total;
 771         int page_order;
 772         struct drm_buf_entry *entry;
 773         drm_dma_handle_t *dmah;
 774         struct drm_buf *buf;
 775         int alignment;
 776         unsigned long offset;
 777         int i;
 778         int byte_count;
 779         int page_count;
 780         unsigned long *temp_pagelist;
 781         struct drm_buf **temp_buflist;
 782
 783         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 784                 return -EINVAL;
 785
 786         if (!dma)
 787                 return -EINVAL;
 788
 789         if (!capable(CAP_SYS_ADMIN))
 790                 return -EPERM;
 791
 792         count = request->count;
 793         order = order_base_2(request->size);
 794         size = 1 << order;
 795
 796         DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 797                   request->count, request->size, size, order);
 798
 799         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 800                 return -EINVAL;
 801
 802         alignment = (request->flags & _DRM_PAGE_ALIGN)
 803             ? PAGE_ALIGN(size) : size;
 804         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 805         total = PAGE_SIZE << page_order;
 806
 807         spin_lock(&dev->buf_lock);
 808         if (dev->buf_use) {
 809                 spin_unlock(&dev->buf_lock);
 810                 return -EBUSY;
 811         }
 812         atomic_inc(&dev->buf_alloc);
 813         spin_unlock(&dev->buf_lock);
 814
 815         mutex_lock(&dev->struct_mutex);
 816         entry = &dma->bufs[order];
 817         if (entry->buf_count) {
 818                 mutex_unlock(&dev->struct_mutex);
 819                 atomic_dec(&dev->buf_alloc);
 820                 return -ENOMEM; /* May only call once for each order */
 821         }
 822
 823         if (count < 0 || count > 4096) {
 824                 mutex_unlock(&dev->struct_mutex);
 825                 atomic_dec(&dev->buf_alloc);
 826                 return -EINVAL;
 827         }
 828
 829         entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 830         if (!entry->buflist) {
 831                 mutex_unlock(&dev->struct_mutex);
 832                 atomic_dec(&dev->buf_alloc);
 833                 return -ENOMEM;
 834         }
 835
 836         entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
 837         if (!entry->seglist) {
 838                 kfree(entry->buflist);
 839                 mutex_unlock(&dev->struct_mutex);
 840                 atomic_dec(&dev->buf_alloc);
 841                 return -ENOMEM;
 842         }
 843
 844         /* Keep the original pagelist until we know all the allocations
 845          * have succeeded
 846          */
 847         temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
 848                                sizeof(*dma->pagelist), GFP_KERNEL);
 849         if (!temp_pagelist) {
 850                 kfree(entry->buflist);
 851                 kfree(entry->seglist);
 852                 mutex_unlock(&dev->struct_mutex);
 853                 atomic_dec(&dev->buf_alloc);
 854                 return -ENOMEM;
 855         }
 856         memcpy(temp_pagelist,
 857                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 858         DRM_DEBUG("pagelist: %d entries\n",
 859                   dma->page_count + (count << page_order));
 860
 861         entry->buf_size = size;
 862         entry->page_order = page_order;
 863         byte_count = 0;
 864         page_count = 0;
 865
 866         while (entry->buf_count < count) {
 867
 868                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 869
 870                 if (!dmah) {
 871                         /* Set count correctly so we free the proper amount. */
 872                         entry->buf_count = count;
 873                         entry->seg_count = count;
 874                         drm_cleanup_buf_error(dev, entry);
 875                         kfree(temp_pagelist);
 876                         mutex_unlock(&dev->struct_mutex);
 877                         atomic_dec(&dev->buf_alloc);
 878                         return -ENOMEM;
 879                 }
 880                 entry->seglist[entry->seg_count++] = dmah;
 881                 for (i = 0; i < (1 << page_order); i++) {
 882                         DRM_DEBUG("page %d @ 0x%08lx\n",
 883                                   dma->page_count + page_count,
 884                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 885                         temp_pagelist[dma->page_count + page_count++]
 886                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 887                 }
 888                 for (offset = 0;
 889                      offset + size <= total && entry->buf_count < count;
 890                      offset += alignment, ++entry->buf_count) {
 891                         buf = &entry->buflist[entry->buf_count];
 892                         buf->idx = dma->buf_count + entry->buf_count;
 893                         buf->total = alignment;
 894                         buf->order = order;
 895                         buf->used = 0;
 896                         buf->offset = (dma->byte_count + byte_count + offset);
 897                         buf->address = (void *)(dmah->vaddr + offset);
 898                         buf->bus_address = dmah->busaddr + offset;
 899                         buf->next = NULL;
 900                         buf->waiting = 0;
 901                         buf->pending = 0;
 902                         buf->file_priv = NULL;
 903
 904                         buf->dev_priv_size = dev->driver->dev_priv_size;
 905                         buf->dev_private = kzalloc(buf->dev_priv_size,
 906                                                 GFP_KERNEL);
 907                         if (!buf->dev_private) {
 908                                 /* Set count correctly so we free the proper amount. */
 909                                 entry->buf_count = count;
 910                                 entry->seg_count = count;
 911                                 drm_cleanup_buf_error(dev, entry);
 912                                 kfree(temp_pagelist);
 913                                 mutex_unlock(&dev->struct_mutex);
 914                                 atomic_dec(&dev->buf_alloc);
 915                                 return -ENOMEM;
 916                         }
 917
 918                         DRM_DEBUG("buffer %d @ %p\n",
 919                                   entry->buf_count, buf->address);
 920                 }
 921                 byte_count += PAGE_SIZE << page_order;
 922         }
 923
 924         temp_buflist = krealloc(dma->buflist,
 925                                 (dma->buf_count + entry->buf_count) *
 926                                 sizeof(*dma->buflist), GFP_KERNEL);
 927         if (!temp_buflist) {
 928                 /* Free the entry because it isn't valid */
 929                 drm_cleanup_buf_error(dev, entry);
 930                 kfree(temp_pagelist);
 931                 mutex_unlock(&dev->struct_mutex);
 932                 atomic_dec(&dev->buf_alloc);
 933                 return -ENOMEM;
 934         }
 935         dma->buflist = temp_buflist;
 936
 937         for (i = 0; i < entry->buf_count; i++) {
 938                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 939         }
 940
 941         /* No allocations failed, so now we can replace the original pagelist
 942          * with the new one.
 943          */
 944         if (dma->page_count) {
 945                 kfree(dma->pagelist);
 946         }
 947         dma->pagelist = temp_pagelist;
 948
 949         dma->buf_count += entry->buf_count;
 950         dma->seg_count += entry->seg_count;
 951         dma->page_count += entry->seg_count << page_order;
 952         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 953
 954         mutex_unlock(&dev->struct_mutex);
 955
 956         request->count = entry->buf_count;
 957         request->size = size;
 958
 959         if (request->flags & _DRM_PCI_BUFFER_RO)
 960                 dma->flags = _DRM_DMA_USE_PCI_RO;
 961
 962         atomic_dec(&dev->buf_alloc);
 963         return 0;
 964
 965 }
 966 EXPORT_SYMBOL(drm_legacy_addbufs_pci);
 967
 968 static int drm_legacy_addbufs_sg(struct drm_device *dev,
 969                                  struct drm_buf_desc *request)
 970 {
 971         struct drm_device_dma *dma = dev->dma;
 972         struct drm_buf_entry *entry;
 973         struct drm_buf *buf;
 974         unsigned long offset;
 975         unsigned long agp_offset;
 976         int count;
 977         int order;
 978         int size;
 979         int alignment;
 980         int page_order;
 981         int total;
 982         int byte_count;
 983         int i;
 984         struct drm_buf **temp_buflist;
 985
 986         if (!drm_core_check_feature(dev, DRIVER_SG))
 987                 return -EINVAL;
 988
 989         if (!dma)
 990                 return -EINVAL;
 991
 992         if (!capable(CAP_SYS_ADMIN))
 993                 return -EPERM;
 994
 995         count = request->count;
 996         order = order_base_2(request->size);
 997         size = 1 << order;
 998
 999         alignment = (request->flags & _DRM_PAGE_ALIGN)
1000             ? PAGE_ALIGN(size) : size;
1001         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1002         total = PAGE_SIZE << page_order;
1003
1004         byte_count = 0;
1005         agp_offset = request->agp_start;
1006
1007         DRM_DEBUG("count:      %d\n", count);
1008         DRM_DEBUG("order:      %d\n", order);
1009         DRM_DEBUG("size:       %d\n", size);
1010         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1011         DRM_DEBUG("alignment:  %d\n", alignment);
1012         DRM_DEBUG("page_order: %d\n", page_order);
1013         DRM_DEBUG("total:      %d\n", total);
1014
1015         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1016                 return -EINVAL;
1017
1018         spin_lock(&dev->buf_lock);
1019         if (dev->buf_use) {
1020                 spin_unlock(&dev->buf_lock);
1021                 return -EBUSY;
1022         }
1023         atomic_inc(&dev->buf_alloc);
1024         spin_unlock(&dev->buf_lock);
1025
1026         mutex_lock(&dev->struct_mutex);
1027         entry = &dma->bufs[order];
1028         if (entry->buf_count) {
1029                 mutex_unlock(&dev->struct_mutex);
1030                 atomic_dec(&dev->buf_alloc);
1031                 return -ENOMEM; /* May only call once for each order */
1032         }
1033
1034         if (count < 0 || count > 4096) {
1035                 mutex_unlock(&dev->struct_mutex);
1036                 atomic_dec(&dev->buf_alloc);
1037                 return -EINVAL;
1038         }
1039
1040         entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1041                                 GFP_KERNEL);
1042         if (!entry->buflist) {
1043                 mutex_unlock(&dev->struct_mutex);
1044                 atomic_dec(&dev->buf_alloc);
1045                 return -ENOMEM;
1046         }
1047
1048         entry->buf_size = size;
1049         entry->page_order = page_order;
1050
1051         offset = 0;
1052
1053         while (entry->buf_count < count) {
1054                 buf = &entry->buflist[entry->buf_count];
1055                 buf->idx = dma->buf_count + entry->buf_count;
1056                 buf->total = alignment;
1057                 buf->order = order;
1058                 buf->used = 0;
1059
1060                 buf->offset = (dma->byte_count + offset);
1061                 buf->bus_address = agp_offset + offset;
1062                 buf->address = (void *)(agp_offset + offset
1063                                         + (unsigned long)dev->sg->virtual);
1064                 buf->next = NULL;
1065                 buf->waiting = 0;
1066                 buf->pending = 0;
1067                 buf->file_priv = NULL;
1068
1069                 buf->dev_priv_size = dev->driver->dev_priv_size;
1070                 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1071                 if (!buf->dev_private) {
1072                         /* Set count correctly so we free the proper amount. */
1073                         entry->buf_count = count;
1074                         drm_cleanup_buf_error(dev, entry);
1075                         mutex_unlock(&dev->struct_mutex);
1076                         atomic_dec(&dev->buf_alloc);
1077                         return -ENOMEM;
1078                 }
1079
1080                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1081
1082                 offset += alignment;
1083                 entry->buf_count++;
1084                 byte_count += PAGE_SIZE << page_order;
1085         }
1086
1087         DRM_DEBUG("byte_count: %d\n", byte_count);
1088
1089         temp_buflist = krealloc(dma->buflist,
1090                                 (dma->buf_count + entry->buf_count) *
1091                                 sizeof(*dma->buflist), GFP_KERNEL);
1092         if (!temp_buflist) {
1093                 /* Free the entry because it isn't valid */
1094                 drm_cleanup_buf_error(dev, entry);
1095                 mutex_unlock(&dev->struct_mutex);
1096                 atomic_dec(&dev->buf_alloc);
1097                 return -ENOMEM;
1098         }
1099         dma->buflist = temp_buflist;
1100
1101         for (i = 0; i < entry->buf_count; i++) {
1102                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1103         }
1104
1105         dma->buf_count += entry->buf_count;
1106         dma->seg_count += entry->seg_count;
1107         dma->page_count += byte_count >> PAGE_SHIFT;
1108         dma->byte_count += byte_count;
1109
1110         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1111         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1112
1113         mutex_unlock(&dev->struct_mutex);
1114
1115         request->count = entry->buf_count;
1116         request->size = size;
1117
1118         dma->flags = _DRM_DMA_USE_SG;
1119
1120         atomic_dec(&dev->buf_alloc);
1121         return 0;
1122 }
1123
1124 /**
1125  * Add buffers for DMA transfers (ioctl).
1126  *
1127  * \param inode device inode.
1128  * \param file_priv DRM file private.
1129  * \param cmd command.
1130  * \param arg pointer to a struct drm_buf_desc request.
1131  * \return zero on success or a negative number on failure.
1132  *
1133  * According with the memory type specified in drm_buf_desc::flags and the
1134  * build options, it dispatches the call either to addbufs_agp(),
1135  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1136  * PCI memory respectively.
1137  */
1138 int drm_legacy_addbufs(struct drm_device *dev, void *data,
1139                        struct drm_file *file_priv)
1140 {
1141         struct drm_buf_desc *request = data;
1142         int ret;
1143
1144         if (drm_core_check_feature(dev, DRIVER_MODESET))
1145                 return -EINVAL;
1146
1147         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1148                 return -EINVAL;
1149
1150 #if IS_ENABLED(CONFIG_AGP)
1151         if (request->flags & _DRM_AGP_BUFFER)
1152                 ret = drm_legacy_addbufs_agp(dev, request);
1153         else
1154 #endif
1155         if (request->flags & _DRM_SG_BUFFER)
1156                 ret = drm_legacy_addbufs_sg(dev, request);
1157         else if (request->flags & _DRM_FB_BUFFER)
1158                 ret = -EINVAL;
1159         else
1160                 ret = drm_legacy_addbufs_pci(dev, request);
1161
1162         return ret;
1163 }
1164
1165 /**
1166  * Get information about the buffer mappings.
1167  *
1168  * This was originally mean for debugging purposes, or by a sophisticated
1169  * client library to determine how best to use the available buffers (e.g.,
1170  * large buffers can be used for image transfer).
1171  *
1172  * \param inode device inode.
1173  * \param file_priv DRM file private.
1174  * \param cmd command.
1175  * \param arg pointer to a drm_buf_info structure.
1176  * \return zero on success or a negative number on failure.
1177  *
1178  * Increments drm_device::buf_use while holding the drm_device::buf_lock
1179  * lock, preventing of allocating more buffers after this call. Information
1180  * about each requested buffer is then copied into user space.
1181  */
1182 int drm_legacy_infobufs(struct drm_device *dev, void *data,
1183                         struct drm_file *file_priv)
1184 {
1185         struct drm_device_dma *dma = dev->dma;
1186         struct drm_buf_info *request = data;
1187         int i;
1188         int count;
1189
1190         if (drm_core_check_feature(dev, DRIVER_MODESET))
1191                 return -EINVAL;
1192
1193         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1194                 return -EINVAL;
1195
1196         if (!dma)
1197                 return -EINVAL;
1198
1199         spin_lock(&dev->buf_lock);
1200         if (atomic_read(&dev->buf_alloc)) {
1201                 spin_unlock(&dev->buf_lock);
1202                 return -EBUSY;
1203         }
1204         ++dev->buf_use;         /* Can't allocate more after this call */
1205         spin_unlock(&dev->buf_lock);
1206
1207         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1208                 if (dma->bufs[i].buf_count)
1209                         ++count;
1210         }
1211
1212         DRM_DEBUG("count = %d\n", count);
1213
1214         if (request->count >= count) {
1215                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1216                         if (dma->bufs[i].buf_count) {
1217                                 struct drm_buf_desc __user *to =
1218                                     &request->list[count];
1219                                 struct drm_buf_entry *from = &dma->bufs[i];
1220                                 if (copy_to_user(&to->count,
1221                                                  &from->buf_count,
1222                                                  sizeof(from->buf_count)) ||
1223                                     copy_to_user(&to->size,
1224                                                  &from->buf_size,
1225                                                  sizeof(from->buf_size)) ||
1226                                     copy_to_user(&to->low_mark,
1227                                                  &from->low_mark,
1228                                                  sizeof(from->low_mark)) ||
1229                                     copy_to_user(&to->high_mark,
1230                                                  &from->high_mark,
1231                                                  sizeof(from->high_mark)))
1232                                         return -EFAULT;
1233
1234                                 DRM_DEBUG("%d %d %d %d %d\n",
1235                                           i,
1236                                           dma->bufs[i].buf_count,
1237                                           dma->bufs[i].buf_size,
1238                                           dma->bufs[i].low_mark,
1239                                           dma->bufs[i].high_mark);
1240                                 ++count;
1241                         }
1242                 }
1243         }
1244         request->count = count;
1245
1246         return 0;
1247 }
1248
1249 /**
1250  * Specifies a low and high water mark for buffer allocation
1251  *
1252  * \param inode device inode.
1253  * \param file_priv DRM file private.
1254  * \param cmd command.
1255  * \param arg a pointer to a drm_buf_desc structure.
1256  * \return zero on success or a negative number on failure.
1257  *
1258  * Verifies that the size order is bounded between the admissible orders and
1259  * updates the respective drm_device_dma::bufs entry low and high water mark.
1260  *
1261  * \note This ioctl is deprecated and mostly never used.
1262  */
1263 int drm_legacy_markbufs(struct drm_device *dev, void *data,
1264                         struct drm_file *file_priv)
1265 {
1266         struct drm_device_dma *dma = dev->dma;
1267         struct drm_buf_desc *request = data;
1268         int order;
1269         struct drm_buf_entry *entry;
1270
1271         if (drm_core_check_feature(dev, DRIVER_MODESET))
1272                 return -EINVAL;
1273
1274         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1275                 return -EINVAL;
1276
1277         if (!dma)
1278                 return -EINVAL;
1279
1280         DRM_DEBUG("%d, %d, %d\n",
1281                   request->size, request->low_mark, request->high_mark);
1282         order = order_base_2(request->size);
1283         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1284                 return -EINVAL;
1285         entry = &dma->bufs[order];
1286
1287         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1288                 return -EINVAL;
1289         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1290                 return -EINVAL;
1291
1292         entry->low_mark = request->low_mark;
1293         entry->high_mark = request->high_mark;
1294
1295         return 0;
1296 }
1297
1298 /**
1299  * Unreserve the buffers in list, previously reserved using drmDMA.
1300  *
1301  * \param inode device inode.
1302  * \param file_priv DRM file private.
1303  * \param cmd command.
1304  * \param arg pointer to a drm_buf_free structure.
1305  * \return zero on success or a negative number on failure.
1306  *
1307  * Calls free_buffer() for each used buffer.
1308  * This function is primarily used for debugging.
1309  */
1310 int drm_legacy_freebufs(struct drm_device *dev, void *data,
1311                         struct drm_file *file_priv)
1312 {
1313         struct drm_device_dma *dma = dev->dma;
1314         struct drm_buf_free *request = data;
1315         int i;
1316         int idx;
1317         struct drm_buf *buf;
1318
1319         if (drm_core_check_feature(dev, DRIVER_MODESET))
1320                 return -EINVAL;
1321
1322         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1323                 return -EINVAL;
1324
1325         if (!dma)
1326                 return -EINVAL;
1327
1328         DRM_DEBUG("%d\n", request->count);
1329         for (i = 0; i < request->count; i++) {
1330                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1331                         return -EFAULT;
1332                 if (idx < 0 || idx >= dma->buf_count) {
1333                         DRM_ERROR("Index %d (of %d max)\n",
1334                                   idx, dma->buf_count - 1);
1335                         return -EINVAL;
1336                 }
1337                 idx = array_index_nospec(idx, dma->buf_count);
1338                 buf = dma->buflist[idx];
1339                 if (buf->file_priv != file_priv) {
1340                         DRM_ERROR("Process %d freeing buffer not owned\n",
1341                                   task_pid_nr(current));
1342                         return -EINVAL;
1343                 }
1344                 drm_legacy_free_buffer(dev, buf);
1345         }
1346
1347         return 0;
1348 }
1349
1350 /**
1351  * Maps all of the DMA buffers into client-virtual space (ioctl).
1352  *
1353  * \param inode device inode.
1354  * \param file_priv DRM file private.
1355  * \param cmd command.
1356  * \param arg pointer to a drm_buf_map structure.
1357  * \return zero on success or a negative number on failure.
1358  *
1359  * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1360  * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1361  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1362  * drm_mmap_dma().
1363  */
1364 int drm_legacy_mapbufs(struct drm_device *dev, void *data,
1365                        struct drm_file *file_priv)
1366 {
1367         struct drm_device_dma *dma = dev->dma;
1368         int retcode = 0;
1369         const int zero = 0;
1370         unsigned long virtual;
1371         unsigned long address;
1372         struct drm_buf_map *request = data;
1373         int i;
1374
1375         if (drm_core_check_feature(dev, DRIVER_MODESET))
1376                 return -EINVAL;
1377
1378         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1379                 return -EINVAL;
1380
1381         if (!dma)
1382                 return -EINVAL;
1383
1384         spin_lock(&dev->buf_lock);
1385         if (atomic_read(&dev->buf_alloc)) {
1386                 spin_unlock(&dev->buf_lock);
1387                 return -EBUSY;
1388         }
1389         dev->buf_use++;         /* Can't allocate more after this call */
1390         spin_unlock(&dev->buf_lock);
1391
1392         if (request->count >= dma->buf_count) {
1393                 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1394                     || (drm_core_check_feature(dev, DRIVER_SG)
1395                         && (dma->flags & _DRM_DMA_USE_SG))) {
1396                         struct drm_local_map *map = dev->agp_buffer_map;
1397                         unsigned long token = dev->agp_buffer_token;
1398
1399                         if (!map) {
1400                                 retcode = -EINVAL;
1401                                 goto done;
1402                         }
1403                         virtual = vm_mmap(file_priv->filp, 0, map->size,
1404                                           PROT_READ | PROT_WRITE,
1405                                           MAP_SHARED,
1406                                           token);
1407                 } else {
1408                         virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1409                                           PROT_READ | PROT_WRITE,
1410                                           MAP_SHARED, 0);
1411                 }
1412                 if (virtual > -1024UL) {
1413                         /* Real error */
1414                         retcode = (signed long)virtual;
1415                         goto done;
1416                 }
1417                 request->virtual = (void __user *)virtual;
1418
1419                 for (i = 0; i < dma->buf_count; i++) {
1420                         if (copy_to_user(&request->list[i].idx,
1421                                          &dma->buflist[i]->idx,
1422                                          sizeof(request->list[0].idx))) {
1423                                 retcode = -EFAULT;
1424                                 goto done;
1425                         }
1426                         if (copy_to_user(&request->list[i].total,
1427                                          &dma->buflist[i]->total,
1428                                          sizeof(request->list[0].total))) {
1429                                 retcode = -EFAULT;
1430                                 goto done;
1431                         }
1432                         if (copy_to_user(&request->list[i].used,
1433                                          &zero, sizeof(zero))) {
1434                                 retcode = -EFAULT;
1435                                 goto done;
1436                         }
1437                         address = virtual + dma->buflist[i]->offset;    /* *** */
1438                         if (copy_to_user(&request->list[i].address,
1439                                          &address, sizeof(address))) {
1440                                 retcode = -EFAULT;
1441                                 goto done;
1442                         }
1443                 }
1444         }
1445       done:
1446         request->count = dma->buf_count;
1447         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1448
1449         return retcode;
1450 }
1451
1452 int drm_legacy_dma_ioctl(struct drm_device *dev, void *data,
1453                   struct drm_file *file_priv)
1454 {
1455         if (drm_core_check_feature(dev, DRIVER_MODESET))
1456                 return -EINVAL;
1457
1458         if (dev->driver->dma_ioctl)
1459                 return dev->driver->dma_ioctl(dev, data, file_priv);
1460         else
1461                 return -EINVAL;
1462 }
1463
1464 struct drm_local_map *drm_legacy_getsarea(struct drm_device *dev)
1465 {
1466         struct drm_map_list *entry;
1467
1468         list_for_each_entry(entry, &dev->maplist, head) {
1469                 if (entry->map && entry->map->type == _DRM_SHM &&
1470                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1471                         return entry->map;
1472                 }
1473         }
1474         return NULL;
1475 }
1476 EXPORT_SYMBOL(drm_legacy_getsarea);