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