drivers/char/drm/drm_bufs.c

   1 /**
   2  * \file drm_bufs.c
   3  * Generic buffer template
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
  11  *
  12  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
  13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14  * All Rights Reserved.
  15  *
  16  * Permission is hereby granted, free of charge, to any person obtaining a
  17  * copy of this software and associated documentation files (the "Software"),
  18  * to deal in the Software without restriction, including without limitation
  19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20  * and/or sell copies of the Software, and to permit persons to whom the
  21  * Software is furnished to do so, subject to the following conditions:
  22  *
  23  * The above copyright notice and this permission notice (including the next
  24  * paragraph) shall be included in all copies or substantial portions of the
  25  * Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33  * OTHER DEALINGS IN THE SOFTWARE.
  34  */
  35
  36 #include <linux/vmalloc.h>
  37 #include "drmP.h"
  38
  39 unsigned long drm_get_resource_start(drm_device_t *dev, unsigned int resource)
  40 {
  41         return pci_resource_start(dev->pdev, resource);
  42 }
  43 EXPORT_SYMBOL(drm_get_resource_start);
  44
  45 unsigned long drm_get_resource_len(drm_device_t *dev, unsigned int resource)
  46 {
  47         return pci_resource_len(dev->pdev, resource);
  48 }
  49
  50 EXPORT_SYMBOL(drm_get_resource_len);
  51
  52 static drm_map_list_t *drm_find_matching_map(drm_device_t *dev,
  53                                              drm_local_map_t *map)
  54 {
  55         struct list_head *list;
  56
  57         list_for_each(list, &dev->maplist->head) {
  58                 drm_map_list_t *entry = list_entry(list, drm_map_list_t, head);
  59                 if (entry->map && map->type == entry->map->type &&
  60                     entry->map->offset == map->offset) {
  61                         return entry;
  62                 }
  63         }
  64
  65         return NULL;
  66 }
  67
  68 static int drm_map_handle(drm_device_t *dev, drm_hash_item_t *hash,
  69                           unsigned long user_token, int hashed_handle)
  70 {
  71         int use_hashed_handle;
  72 #if (BITS_PER_LONG == 64)
  73         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  74 #elif (BITS_PER_LONG == 32)
  75         use_hashed_handle = hashed_handle;
  76 #else
  77 #error Unsupported long size. Neither 64 nor 32 bits.
  78 #endif
  79
  80         if (!use_hashed_handle) {
  81                 int ret;
  82                 hash->key = user_token >> PAGE_SHIFT;
  83                 ret = drm_ht_insert_item(&dev->map_hash, hash);
  84                 if (ret != -EINVAL)
  85                         return ret;
  86         }
  87         return drm_ht_just_insert_please(&dev->map_hash, hash,
  88                                          user_token, 32 - PAGE_SHIFT - 3,
  89                                          0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT);
  90 }
  91
  92 /**
  93  * Ioctl to specify a range of memory that is available for mapping by a non-root process.
  94  *
  95  * \param inode device inode.
  96  * \param filp file pointer.
  97  * \param cmd command.
  98  * \param arg pointer to a drm_map structure.
  99  * \return zero on success or a negative value on error.
 100  *
 101  * Adjusts the memory offset to its absolute value according to the mapping
 102  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 103  * applicable and if supported by the kernel.
 104  */
 105 static int drm_addmap_core(drm_device_t * dev, unsigned int offset,
 106                            unsigned int size, drm_map_type_t type,
 107                            drm_map_flags_t flags, drm_map_list_t ** maplist)
 108 {
 109         drm_map_t *map;
 110         drm_map_list_t *list;
 111         drm_dma_handle_t *dmah;
 112         unsigned long user_token;
 113         int ret;
 114
 115         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
 116         if (!map)
 117                 return -ENOMEM;
 118
 119         map->offset = offset;
 120         map->size = size;
 121         map->flags = flags;
 122         map->type = type;
 123
 124         /* Only allow shared memory to be removable since we only keep enough
 125          * book keeping information about shared memory to allow for removal
 126          * when processes fork.
 127          */
 128         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 129                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 130                 return -EINVAL;
 131         }
 132         DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
 133                   map->offset, map->size, map->type);
 134         if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 135                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 136                 return -EINVAL;
 137         }
 138         map->mtrr = -1;
 139         map->handle = NULL;
 140
 141         switch (map->type) {
 142         case _DRM_REGISTERS:
 143         case _DRM_FRAME_BUFFER:
 144 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 145                 if (map->offset + (map->size-1) < map->offset ||
 146                     map->offset < virt_to_phys(high_memory)) {
 147                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 148                         return -EINVAL;
 149                 }
 150 #endif
 151 #ifdef __alpha__
 152                 map->offset += dev->hose->mem_space->start;
 153 #endif
 154                 /* Some drivers preinitialize some maps, without the X Server
 155                  * needing to be aware of it.  Therefore, we just return success
 156                  * when the server tries to create a duplicate map.
 157                  */
 158                 list = drm_find_matching_map(dev, map);
 159                 if (list != NULL) {
 160                         if (list->map->size != map->size) {
 161                                 DRM_DEBUG("Matching maps of type %d with "
 162                                           "mismatched sizes, (%ld vs %ld)\n",
 163                                           map->type, map->size,
 164                                           list->map->size);
 165                                 list->map->size = map->size;
 166                         }
 167
 168                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 169                         *maplist = list;
 170                         return 0;
 171                 }
 172
 173                 if (drm_core_has_MTRR(dev)) {
 174                         if (map->type == _DRM_FRAME_BUFFER ||
 175                             (map->flags & _DRM_WRITE_COMBINING)) {
 176                                 map->mtrr = mtrr_add(map->offset, map->size,
 177                                                      MTRR_TYPE_WRCOMB, 1);
 178                         }
 179                 }
 180                 if (map->type == _DRM_REGISTERS)
 181                         map->handle = ioremap(map->offset, map->size);
 182                 break;
 183
 184         case _DRM_SHM:
 185                 map->handle = vmalloc_user(map->size);
 186                 DRM_DEBUG("%lu %d %p\n",
 187                           map->size, drm_order(map->size), map->handle);
 188                 if (!map->handle) {
 189                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 190                         return -ENOMEM;
 191                 }
 192                 map->offset = (unsigned long)map->handle;
 193                 if (map->flags & _DRM_CONTAINS_LOCK) {
 194                         /* Prevent a 2nd X Server from creating a 2nd lock */
 195                         if (dev->lock.hw_lock != NULL) {
 196                                 vfree(map->handle);
 197                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 198                                 return -EBUSY;
 199                         }
 200                         dev->sigdata.lock = dev->lock.hw_lock = map->handle;    /* Pointer to lock */
 201                 }
 202                 break;
 203         case _DRM_AGP:
 204                 if (drm_core_has_AGP(dev)) {
 205 #ifdef __alpha__
 206                         map->offset += dev->hose->mem_space->start;
 207 #endif
 208                         map->offset += dev->agp->base;
 209                         map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 210                 }
 211                 break;
 212         case _DRM_SCATTER_GATHER:
 213                 if (!dev->sg) {
 214                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 215                         return -EINVAL;
 216                 }
 217                 map->offset += (unsigned long)dev->sg->virtual;
 218                 break;
 219         case _DRM_CONSISTENT:
 220                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 221                  * As we're limiting the address to 2^32-1 (or less),
 222                  * casting it down to 32 bits is no problem, but we
 223                  * need to point to a 64bit variable first. */
 224                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 225                 if (!dmah) {
 226                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 227                         return -ENOMEM;
 228                 }
 229                 map->handle = dmah->vaddr;
 230                 map->offset = (unsigned long)dmah->busaddr;
 231                 kfree(dmah);
 232                 break;
 233         default:
 234                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 235                 return -EINVAL;
 236         }
 237
 238         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 239         if (!list) {
 240                 if (map->type == _DRM_REGISTERS)
 241                         iounmap(map->handle);
 242                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 243                 return -EINVAL;
 244         }
 245         memset(list, 0, sizeof(*list));
 246         list->map = map;
 247
 248         mutex_lock(&dev->struct_mutex);
 249         list_add(&list->head, &dev->maplist->head);
 250
 251         /* Assign a 32-bit handle */
 252         /* We do it here so that dev->struct_mutex protects the increment */
 253         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 254                 map->offset;
 255         ret = drm_map_handle(dev, &list->hash, user_token, 0);
 256         if (ret) {
 257                 if (map->type == _DRM_REGISTERS)
 258                         iounmap(map->handle);
 259                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 260                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 261                 mutex_unlock(&dev->struct_mutex);
 262                 return ret;
 263         }
 264
 265         list->user_token = list->hash.key << PAGE_SHIFT;
 266         mutex_unlock(&dev->struct_mutex);
 267
 268         *maplist = list;
 269         return 0;
 270 }
 271
 272 int drm_addmap(drm_device_t * dev, unsigned int offset,
 273                unsigned int size, drm_map_type_t type,
 274                drm_map_flags_t flags, drm_local_map_t ** map_ptr)
 275 {
 276         drm_map_list_t *list;
 277         int rc;
 278
 279         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 280         if (!rc)
 281                 *map_ptr = list->map;
 282         return rc;
 283 }
 284
 285 EXPORT_SYMBOL(drm_addmap);
 286
 287 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
 288                      unsigned int cmd, unsigned long arg)
 289 {
 290         drm_file_t *priv = filp->private_data;
 291         drm_device_t *dev = priv->head->dev;
 292         drm_map_t map;
 293         drm_map_list_t *maplist;
 294         drm_map_t __user *argp = (void __user *)arg;
 295         int err;
 296
 297         if (!(filp->f_mode & 3))
 298                 return -EACCES; /* Require read/write */
 299
 300         if (copy_from_user(&map, argp, sizeof(map))) {
 301                 return -EFAULT;
 302         }
 303
 304         if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
 305                 return -EPERM;
 306
 307         err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
 308                               &maplist);
 309
 310         if (err)
 311                 return err;
 312
 313         if (copy_to_user(argp, maplist->map, sizeof(drm_map_t)))
 314                 return -EFAULT;
 315
 316         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 317         if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
 318                 return -EFAULT;
 319         return 0;
 320 }
 321
 322 /**
 323  * Remove a map private from list and deallocate resources if the mapping
 324  * isn't in use.
 325  *
 326  * \param inode device inode.
 327  * \param filp file pointer.
 328  * \param cmd command.
 329  * \param arg pointer to a drm_map_t structure.
 330  * \return zero on success or a negative value on error.
 331  *
 332  * Searches the map on drm_device::maplist, removes it from the list, see if
 333  * its being used, and free any associate resource (such as MTRR's) if it's not
 334  * being on use.
 335  *
 336  * \sa drm_addmap
 337  */
 338 int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
 339 {
 340         struct list_head *list;
 341         drm_map_list_t *r_list = NULL;
 342         drm_dma_handle_t dmah;
 343
 344         /* Find the list entry for the map and remove it */
 345         list_for_each(list, &dev->maplist->head) {
 346                 r_list = list_entry(list, drm_map_list_t, head);
 347
 348                 if (r_list->map == map) {
 349                         list_del(list);
 350                         drm_ht_remove_key(&dev->map_hash,
 351                                           r_list->user_token >> PAGE_SHIFT);
 352                         drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 353                         break;
 354                 }
 355         }
 356
 357         /* List has wrapped around to the head pointer, or it's empty and we
 358          * didn't find anything.
 359          */
 360         if (list == (&dev->maplist->head)) {
 361                 return -EINVAL;
 362         }
 363
 364         switch (map->type) {
 365         case _DRM_REGISTERS:
 366                 iounmap(map->handle);
 367                 /* FALLTHROUGH */
 368         case _DRM_FRAME_BUFFER:
 369                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 370                         int retcode;
 371                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 372                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 373                 }
 374                 break;
 375         case _DRM_SHM:
 376                 vfree(map->handle);
 377                 break;
 378         case _DRM_AGP:
 379         case _DRM_SCATTER_GATHER:
 380                 break;
 381         case _DRM_CONSISTENT:
 382                 dmah.vaddr = map->handle;
 383                 dmah.busaddr = map->offset;
 384                 dmah.size = map->size;
 385                 __drm_pci_free(dev, &dmah);
 386                 break;
 387         }
 388         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 389
 390         return 0;
 391 }
 392
 393 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
 394 {
 395         int ret;
 396
 397         mutex_lock(&dev->struct_mutex);
 398         ret = drm_rmmap_locked(dev, map);
 399         mutex_unlock(&dev->struct_mutex);
 400
 401         return ret;
 402 }
 403
 404 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 405  * the last close of the device, and this is necessary for cleanup when things
 406  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 407  * like a pointless exercise since they're going away anyway.
 408  *
 409  * One use case might be after addmap is allowed for normal users for SHM and
 410  * gets used by drivers that the server doesn't need to care about.  This seems
 411  * unlikely.
 412  */
 413 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 414                     unsigned int cmd, unsigned long arg)
 415 {
 416         drm_file_t *priv = filp->private_data;
 417         drm_device_t *dev = priv->head->dev;
 418         drm_map_t request;
 419         drm_local_map_t *map = NULL;
 420         struct list_head *list;
 421         int ret;
 422
 423         if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
 424                 return -EFAULT;
 425         }
 426
 427         mutex_lock(&dev->struct_mutex);
 428         list_for_each(list, &dev->maplist->head) {
 429                 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 430
 431                 if (r_list->map &&
 432                     r_list->user_token == (unsigned long)request.handle &&
 433                     r_list->map->flags & _DRM_REMOVABLE) {
 434                         map = r_list->map;
 435                         break;
 436                 }
 437         }
 438
 439         /* List has wrapped around to the head pointer, or its empty we didn't
 440          * find anything.
 441          */
 442         if (list == (&dev->maplist->head)) {
 443                 mutex_unlock(&dev->struct_mutex);
 444                 return -EINVAL;
 445         }
 446
 447         if (!map) {
 448                 mutex_unlock(&dev->struct_mutex);
 449                 return -EINVAL;
 450         }
 451
 452         /* Register and framebuffer maps are permanent */
 453         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 454                 mutex_unlock(&dev->struct_mutex);
 455                 return 0;
 456         }
 457
 458         ret = drm_rmmap_locked(dev, map);
 459
 460         mutex_unlock(&dev->struct_mutex);
 461
 462         return ret;
 463 }
 464
 465 /**
 466  * Cleanup after an error on one of the addbufs() functions.
 467  *
 468  * \param dev DRM device.
 469  * \param entry buffer entry where the error occurred.
 470  *
 471  * Frees any pages and buffers associated with the given entry.
 472  */
 473 static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
 474 {
 475         int i;
 476
 477         if (entry->seg_count) {
 478                 for (i = 0; i < entry->seg_count; i++) {
 479                         if (entry->seglist[i]) {
 480                                 drm_pci_free(dev, entry->seglist[i]);
 481                         }
 482                 }
 483                 drm_free(entry->seglist,
 484                          entry->seg_count *
 485                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 486
 487                 entry->seg_count = 0;
 488         }
 489
 490         if (entry->buf_count) {
 491                 for (i = 0; i < entry->buf_count; i++) {
 492                         if (entry->buflist[i].dev_private) {
 493                                 drm_free(entry->buflist[i].dev_private,
 494                                          entry->buflist[i].dev_priv_size,
 495                                          DRM_MEM_BUFS);
 496                         }
 497                 }
 498                 drm_free(entry->buflist,
 499                          entry->buf_count *
 500                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 501
 502                 entry->buf_count = 0;
 503         }
 504 }
 505
 506 #if __OS_HAS_AGP
 507 /**
 508  * Add AGP buffers for DMA transfers.
 509  *
 510  * \param dev drm_device_t to which the buffers are to be added.
 511  * \param request pointer to a drm_buf_desc_t describing the request.
 512  * \return zero on success or a negative number on failure.
 513  *
 514  * After some sanity checks creates a drm_buf structure for each buffer and
 515  * reallocates the buffer list of the same size order to accommodate the new
 516  * buffers.
 517  */
 518 int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
 519 {
 520         drm_device_dma_t *dma = dev->dma;
 521         drm_buf_entry_t *entry;
 522         drm_buf_t *buf;
 523         unsigned long offset;
 524         unsigned long agp_offset;
 525         int count;
 526         int order;
 527         int size;
 528         int alignment;
 529         int page_order;
 530         int total;
 531         int byte_count;
 532         int i;
 533         drm_buf_t **temp_buflist;
 534
 535         if (!dma)
 536                 return -EINVAL;
 537
 538         count = request->count;
 539         order = drm_order(request->size);
 540         size = 1 << order;
 541
 542         alignment = (request->flags & _DRM_PAGE_ALIGN)
 543             ? PAGE_ALIGN(size) : size;
 544         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 545         total = PAGE_SIZE << page_order;
 546
 547         byte_count = 0;
 548         agp_offset = dev->agp->base + request->agp_start;
 549
 550         DRM_DEBUG("count:      %d\n", count);
 551         DRM_DEBUG("order:      %d\n", order);
 552         DRM_DEBUG("size:       %d\n", size);
 553         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 554         DRM_DEBUG("alignment:  %d\n", alignment);
 555         DRM_DEBUG("page_order: %d\n", page_order);
 556         DRM_DEBUG("total:      %d\n", total);
 557
 558         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 559                 return -EINVAL;
 560         if (dev->queue_count)
 561                 return -EBUSY;  /* Not while in use */
 562
 563         spin_lock(&dev->count_lock);
 564         if (dev->buf_use) {
 565                 spin_unlock(&dev->count_lock);
 566                 return -EBUSY;
 567         }
 568         atomic_inc(&dev->buf_alloc);
 569         spin_unlock(&dev->count_lock);
 570
 571         mutex_lock(&dev->struct_mutex);
 572         entry = &dma->bufs[order];
 573         if (entry->buf_count) {
 574                 mutex_unlock(&dev->struct_mutex);
 575                 atomic_dec(&dev->buf_alloc);
 576                 return -ENOMEM; /* May only call once for each order */
 577         }
 578
 579         if (count < 0 || count > 4096) {
 580                 mutex_unlock(&dev->struct_mutex);
 581                 atomic_dec(&dev->buf_alloc);
 582                 return -EINVAL;
 583         }
 584
 585         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 586                                    DRM_MEM_BUFS);
 587         if (!entry->buflist) {
 588                 mutex_unlock(&dev->struct_mutex);
 589                 atomic_dec(&dev->buf_alloc);
 590                 return -ENOMEM;
 591         }
 592         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 593
 594         entry->buf_size = size;
 595         entry->page_order = page_order;
 596
 597         offset = 0;
 598
 599         while (entry->buf_count < count) {
 600                 buf = &entry->buflist[entry->buf_count];
 601                 buf->idx = dma->buf_count + entry->buf_count;
 602                 buf->total = alignment;
 603                 buf->order = order;
 604                 buf->used = 0;
 605
 606                 buf->offset = (dma->byte_count + offset);
 607                 buf->bus_address = agp_offset + offset;
 608                 buf->address = (void *)(agp_offset + offset);
 609                 buf->next = NULL;
 610                 buf->waiting = 0;
 611                 buf->pending = 0;
 612                 init_waitqueue_head(&buf->dma_wait);
 613                 buf->filp = NULL;
 614
 615                 buf->dev_priv_size = dev->driver->dev_priv_size;
 616                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 617                 if (!buf->dev_private) {
 618                         /* Set count correctly so we free the proper amount. */
 619                         entry->buf_count = count;
 620                         drm_cleanup_buf_error(dev, entry);
 621                         mutex_unlock(&dev->struct_mutex);
 622                         atomic_dec(&dev->buf_alloc);
 623                         return -ENOMEM;
 624                 }
 625                 memset(buf->dev_private, 0, buf->dev_priv_size);
 626
 627                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 628
 629                 offset += alignment;
 630                 entry->buf_count++;
 631                 byte_count += PAGE_SIZE << page_order;
 632         }
 633
 634         DRM_DEBUG("byte_count: %d\n", byte_count);
 635
 636         temp_buflist = drm_realloc(dma->buflist,
 637                                    dma->buf_count * sizeof(*dma->buflist),
 638                                    (dma->buf_count + entry->buf_count)
 639                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 640         if (!temp_buflist) {
 641                 /* Free the entry because it isn't valid */
 642                 drm_cleanup_buf_error(dev, entry);
 643                 mutex_unlock(&dev->struct_mutex);
 644                 atomic_dec(&dev->buf_alloc);
 645                 return -ENOMEM;
 646         }
 647         dma->buflist = temp_buflist;
 648
 649         for (i = 0; i < entry->buf_count; i++) {
 650                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 651         }
 652
 653         dma->buf_count += entry->buf_count;
 654         dma->seg_count += entry->seg_count;
 655         dma->page_count += byte_count >> PAGE_SHIFT;
 656         dma->byte_count += byte_count;
 657
 658         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 659         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 660
 661         mutex_unlock(&dev->struct_mutex);
 662
 663         request->count = entry->buf_count;
 664         request->size = size;
 665
 666         dma->flags = _DRM_DMA_USE_AGP;
 667
 668         atomic_dec(&dev->buf_alloc);
 669         return 0;
 670 }
 671 EXPORT_SYMBOL(drm_addbufs_agp);
 672 #endif                          /* __OS_HAS_AGP */
 673
 674 int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
 675 {
 676         drm_device_dma_t *dma = dev->dma;
 677         int count;
 678         int order;
 679         int size;
 680         int total;
 681         int page_order;
 682         drm_buf_entry_t *entry;
 683         drm_dma_handle_t *dmah;
 684         drm_buf_t *buf;
 685         int alignment;
 686         unsigned long offset;
 687         int i;
 688         int byte_count;
 689         int page_count;
 690         unsigned long *temp_pagelist;
 691         drm_buf_t **temp_buflist;
 692
 693         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 694                 return -EINVAL;
 695
 696         if (!dma)
 697                 return -EINVAL;
 698
 699         if (!capable(CAP_SYS_ADMIN))
 700                 return -EPERM;
 701
 702         count = request->count;
 703         order = drm_order(request->size);
 704         size = 1 << order;
 705
 706         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 707                   request->count, request->size, size, order, dev->queue_count);
 708
 709         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 710                 return -EINVAL;
 711         if (dev->queue_count)
 712                 return -EBUSY;  /* Not while in use */
 713
 714         alignment = (request->flags & _DRM_PAGE_ALIGN)
 715             ? PAGE_ALIGN(size) : size;
 716         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 717         total = PAGE_SIZE << page_order;
 718
 719         spin_lock(&dev->count_lock);
 720         if (dev->buf_use) {
 721                 spin_unlock(&dev->count_lock);
 722                 return -EBUSY;
 723         }
 724         atomic_inc(&dev->buf_alloc);
 725         spin_unlock(&dev->count_lock);
 726
 727         mutex_lock(&dev->struct_mutex);
 728         entry = &dma->bufs[order];
 729         if (entry->buf_count) {
 730                 mutex_unlock(&dev->struct_mutex);
 731                 atomic_dec(&dev->buf_alloc);
 732                 return -ENOMEM; /* May only call once for each order */
 733         }
 734
 735         if (count < 0 || count > 4096) {
 736                 mutex_unlock(&dev->struct_mutex);
 737                 atomic_dec(&dev->buf_alloc);
 738                 return -EINVAL;
 739         }
 740
 741         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 742                                    DRM_MEM_BUFS);
 743         if (!entry->buflist) {
 744                 mutex_unlock(&dev->struct_mutex);
 745                 atomic_dec(&dev->buf_alloc);
 746                 return -ENOMEM;
 747         }
 748         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 749
 750         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 751                                    DRM_MEM_SEGS);
 752         if (!entry->seglist) {
 753                 drm_free(entry->buflist,
 754                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 755                 mutex_unlock(&dev->struct_mutex);
 756                 atomic_dec(&dev->buf_alloc);
 757                 return -ENOMEM;
 758         }
 759         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 760
 761         /* Keep the original pagelist until we know all the allocations
 762          * have succeeded
 763          */
 764         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 765                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 766         if (!temp_pagelist) {
 767                 drm_free(entry->buflist,
 768                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 769                 drm_free(entry->seglist,
 770                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 771                 mutex_unlock(&dev->struct_mutex);
 772                 atomic_dec(&dev->buf_alloc);
 773                 return -ENOMEM;
 774         }
 775         memcpy(temp_pagelist,
 776                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 777         DRM_DEBUG("pagelist: %d entries\n",
 778                   dma->page_count + (count << page_order));
 779
 780         entry->buf_size = size;
 781         entry->page_order = page_order;
 782         byte_count = 0;
 783         page_count = 0;
 784
 785         while (entry->buf_count < count) {
 786
 787                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 788
 789                 if (!dmah) {
 790                         /* Set count correctly so we free the proper amount. */
 791                         entry->buf_count = count;
 792                         entry->seg_count = count;
 793                         drm_cleanup_buf_error(dev, entry);
 794                         drm_free(temp_pagelist,
 795                                  (dma->page_count + (count << page_order))
 796                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 797                         mutex_unlock(&dev->struct_mutex);
 798                         atomic_dec(&dev->buf_alloc);
 799                         return -ENOMEM;
 800                 }
 801                 entry->seglist[entry->seg_count++] = dmah;
 802                 for (i = 0; i < (1 << page_order); i++) {
 803                         DRM_DEBUG("page %d @ 0x%08lx\n",
 804                                   dma->page_count + page_count,
 805                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 806                         temp_pagelist[dma->page_count + page_count++]
 807                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 808                 }
 809                 for (offset = 0;
 810                      offset + size <= total && entry->buf_count < count;
 811                      offset += alignment, ++entry->buf_count) {
 812                         buf = &entry->buflist[entry->buf_count];
 813                         buf->idx = dma->buf_count + entry->buf_count;
 814                         buf->total = alignment;
 815                         buf->order = order;
 816                         buf->used = 0;
 817                         buf->offset = (dma->byte_count + byte_count + offset);
 818                         buf->address = (void *)(dmah->vaddr + offset);
 819                         buf->bus_address = dmah->busaddr + offset;
 820                         buf->next = NULL;
 821                         buf->waiting = 0;
 822                         buf->pending = 0;
 823                         init_waitqueue_head(&buf->dma_wait);
 824                         buf->filp = NULL;
 825
 826                         buf->dev_priv_size = dev->driver->dev_priv_size;
 827                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 828                                                      DRM_MEM_BUFS);
 829                         if (!buf->dev_private) {
 830                                 /* Set count correctly so we free the proper amount. */
 831                                 entry->buf_count = count;
 832                                 entry->seg_count = count;
 833                                 drm_cleanup_buf_error(dev, entry);
 834                                 drm_free(temp_pagelist,
 835                                          (dma->page_count +
 836                                           (count << page_order))
 837                                          * sizeof(*dma->pagelist),
 838                                          DRM_MEM_PAGES);
 839                                 mutex_unlock(&dev->struct_mutex);
 840                                 atomic_dec(&dev->buf_alloc);
 841                                 return -ENOMEM;
 842                         }
 843                         memset(buf->dev_private, 0, buf->dev_priv_size);
 844
 845                         DRM_DEBUG("buffer %d @ %p\n",
 846                                   entry->buf_count, buf->address);
 847                 }
 848                 byte_count += PAGE_SIZE << page_order;
 849         }
 850
 851         temp_buflist = drm_realloc(dma->buflist,
 852                                    dma->buf_count * sizeof(*dma->buflist),
 853                                    (dma->buf_count + entry->buf_count)
 854                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 855         if (!temp_buflist) {
 856                 /* Free the entry because it isn't valid */
 857                 drm_cleanup_buf_error(dev, entry);
 858                 drm_free(temp_pagelist,
 859                          (dma->page_count + (count << page_order))
 860                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 861                 mutex_unlock(&dev->struct_mutex);
 862                 atomic_dec(&dev->buf_alloc);
 863                 return -ENOMEM;
 864         }
 865         dma->buflist = temp_buflist;
 866
 867         for (i = 0; i < entry->buf_count; i++) {
 868                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 869         }
 870
 871         /* No allocations failed, so now we can replace the orginal pagelist
 872          * with the new one.
 873          */
 874         if (dma->page_count) {
 875                 drm_free(dma->pagelist,
 876                          dma->page_count * sizeof(*dma->pagelist),
 877                          DRM_MEM_PAGES);
 878         }
 879         dma->pagelist = temp_pagelist;
 880
 881         dma->buf_count += entry->buf_count;
 882         dma->seg_count += entry->seg_count;
 883         dma->page_count += entry->seg_count << page_order;
 884         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 885
 886         mutex_unlock(&dev->struct_mutex);
 887
 888         request->count = entry->buf_count;
 889         request->size = size;
 890
 891         if (request->flags & _DRM_PCI_BUFFER_RO)
 892                 dma->flags = _DRM_DMA_USE_PCI_RO;
 893
 894         atomic_dec(&dev->buf_alloc);
 895         return 0;
 896
 897 }
 898 EXPORT_SYMBOL(drm_addbufs_pci);
 899
 900 static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
 901 {
 902         drm_device_dma_t *dma = dev->dma;
 903         drm_buf_entry_t *entry;
 904         drm_buf_t *buf;
 905         unsigned long offset;
 906         unsigned long agp_offset;
 907         int count;
 908         int order;
 909         int size;
 910         int alignment;
 911         int page_order;
 912         int total;
 913         int byte_count;
 914         int i;
 915         drm_buf_t **temp_buflist;
 916
 917         if (!drm_core_check_feature(dev, DRIVER_SG))
 918                 return -EINVAL;
 919
 920         if (!dma)
 921                 return -EINVAL;
 922
 923         if (!capable(CAP_SYS_ADMIN))
 924                 return -EPERM;
 925
 926         count = request->count;
 927         order = drm_order(request->size);
 928         size = 1 << order;
 929
 930         alignment = (request->flags & _DRM_PAGE_ALIGN)
 931             ? PAGE_ALIGN(size) : size;
 932         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 933         total = PAGE_SIZE << page_order;
 934
 935         byte_count = 0;
 936         agp_offset = request->agp_start;
 937
 938         DRM_DEBUG("count:      %d\n", count);
 939         DRM_DEBUG("order:      %d\n", order);
 940         DRM_DEBUG("size:       %d\n", size);
 941         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 942         DRM_DEBUG("alignment:  %d\n", alignment);
 943         DRM_DEBUG("page_order: %d\n", page_order);
 944         DRM_DEBUG("total:      %d\n", total);
 945
 946         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 947                 return -EINVAL;
 948         if (dev->queue_count)
 949                 return -EBUSY;  /* Not while in use */
 950
 951         spin_lock(&dev->count_lock);
 952         if (dev->buf_use) {
 953                 spin_unlock(&dev->count_lock);
 954                 return -EBUSY;
 955         }
 956         atomic_inc(&dev->buf_alloc);
 957         spin_unlock(&dev->count_lock);
 958
 959         mutex_lock(&dev->struct_mutex);
 960         entry = &dma->bufs[order];
 961         if (entry->buf_count) {
 962                 mutex_unlock(&dev->struct_mutex);
 963                 atomic_dec(&dev->buf_alloc);
 964                 return -ENOMEM; /* May only call once for each order */
 965         }
 966
 967         if (count < 0 || count > 4096) {
 968                 mutex_unlock(&dev->struct_mutex);
 969                 atomic_dec(&dev->buf_alloc);
 970                 return -EINVAL;
 971         }
 972
 973         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 974                                    DRM_MEM_BUFS);
 975         if (!entry->buflist) {
 976                 mutex_unlock(&dev->struct_mutex);
 977                 atomic_dec(&dev->buf_alloc);
 978                 return -ENOMEM;
 979         }
 980         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 981
 982         entry->buf_size = size;
 983         entry->page_order = page_order;
 984
 985         offset = 0;
 986
 987         while (entry->buf_count < count) {
 988                 buf = &entry->buflist[entry->buf_count];
 989                 buf->idx = dma->buf_count + entry->buf_count;
 990                 buf->total = alignment;
 991                 buf->order = order;
 992                 buf->used = 0;
 993
 994                 buf->offset = (dma->byte_count + offset);
 995                 buf->bus_address = agp_offset + offset;
 996                 buf->address = (void *)(agp_offset + offset
 997                                         + (unsigned long)dev->sg->virtual);
 998                 buf->next = NULL;
 999                 buf->waiting = 0;
1000                 buf->pending = 0;
1001                 init_waitqueue_head(&buf->dma_wait);
1002                 buf->filp = NULL;
1003
1004                 buf->dev_priv_size = dev->driver->dev_priv_size;
1005                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1006                 if (!buf->dev_private) {
1007                         /* Set count correctly so we free the proper amount. */
1008                         entry->buf_count = count;
1009                         drm_cleanup_buf_error(dev, entry);
1010                         mutex_unlock(&dev->struct_mutex);
1011                         atomic_dec(&dev->buf_alloc);
1012                         return -ENOMEM;
1013                 }
1014
1015                 memset(buf->dev_private, 0, buf->dev_priv_size);
1016
1017                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1018
1019                 offset += alignment;
1020                 entry->buf_count++;
1021                 byte_count += PAGE_SIZE << page_order;
1022         }
1023
1024         DRM_DEBUG("byte_count: %d\n", byte_count);
1025
1026         temp_buflist = drm_realloc(dma->buflist,
1027                                    dma->buf_count * sizeof(*dma->buflist),
1028                                    (dma->buf_count + entry->buf_count)
1029                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1030         if (!temp_buflist) {
1031                 /* Free the entry because it isn't valid */
1032                 drm_cleanup_buf_error(dev, entry);
1033                 mutex_unlock(&dev->struct_mutex);
1034                 atomic_dec(&dev->buf_alloc);
1035                 return -ENOMEM;
1036         }
1037         dma->buflist = temp_buflist;
1038
1039         for (i = 0; i < entry->buf_count; i++) {
1040                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1041         }
1042
1043         dma->buf_count += entry->buf_count;
1044         dma->seg_count += entry->seg_count;
1045         dma->page_count += byte_count >> PAGE_SHIFT;
1046         dma->byte_count += byte_count;
1047
1048         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1049         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1050
1051         mutex_unlock(&dev->struct_mutex);
1052
1053         request->count = entry->buf_count;
1054         request->size = size;
1055
1056         dma->flags = _DRM_DMA_USE_SG;
1057
1058         atomic_dec(&dev->buf_alloc);
1059         return 0;
1060 }
1061
1062 static int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
1063 {
1064         drm_device_dma_t *dma = dev->dma;
1065         drm_buf_entry_t *entry;
1066         drm_buf_t *buf;
1067         unsigned long offset;
1068         unsigned long agp_offset;
1069         int count;
1070         int order;
1071         int size;
1072         int alignment;
1073         int page_order;
1074         int total;
1075         int byte_count;
1076         int i;
1077         drm_buf_t **temp_buflist;
1078
1079         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1080                 return -EINVAL;
1081
1082         if (!dma)
1083                 return -EINVAL;
1084
1085         if (!capable(CAP_SYS_ADMIN))
1086                 return -EPERM;
1087
1088         count = request->count;
1089         order = drm_order(request->size);
1090         size = 1 << order;
1091
1092         alignment = (request->flags & _DRM_PAGE_ALIGN)
1093             ? PAGE_ALIGN(size) : size;
1094         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1095         total = PAGE_SIZE << page_order;
1096
1097         byte_count = 0;
1098         agp_offset = request->agp_start;
1099
1100         DRM_DEBUG("count:      %d\n", count);
1101         DRM_DEBUG("order:      %d\n", order);
1102         DRM_DEBUG("size:       %d\n", size);
1103         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1104         DRM_DEBUG("alignment:  %d\n", alignment);
1105         DRM_DEBUG("page_order: %d\n", page_order);
1106         DRM_DEBUG("total:      %d\n", total);
1107
1108         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1109                 return -EINVAL;
1110         if (dev->queue_count)
1111                 return -EBUSY;  /* Not while in use */
1112
1113         spin_lock(&dev->count_lock);
1114         if (dev->buf_use) {
1115                 spin_unlock(&dev->count_lock);
1116                 return -EBUSY;
1117         }
1118         atomic_inc(&dev->buf_alloc);
1119         spin_unlock(&dev->count_lock);
1120
1121         mutex_lock(&dev->struct_mutex);
1122         entry = &dma->bufs[order];
1123         if (entry->buf_count) {
1124                 mutex_unlock(&dev->struct_mutex);
1125                 atomic_dec(&dev->buf_alloc);
1126                 return -ENOMEM; /* May only call once for each order */
1127         }
1128
1129         if (count < 0 || count > 4096) {
1130                 mutex_unlock(&dev->struct_mutex);
1131                 atomic_dec(&dev->buf_alloc);
1132                 return -EINVAL;
1133         }
1134
1135         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1136                                    DRM_MEM_BUFS);
1137         if (!entry->buflist) {
1138                 mutex_unlock(&dev->struct_mutex);
1139                 atomic_dec(&dev->buf_alloc);
1140                 return -ENOMEM;
1141         }
1142         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1143
1144         entry->buf_size = size;
1145         entry->page_order = page_order;
1146
1147         offset = 0;
1148
1149         while (entry->buf_count < count) {
1150                 buf = &entry->buflist[entry->buf_count];
1151                 buf->idx = dma->buf_count + entry->buf_count;
1152                 buf->total = alignment;
1153                 buf->order = order;
1154                 buf->used = 0;
1155
1156                 buf->offset = (dma->byte_count + offset);
1157                 buf->bus_address = agp_offset + offset;
1158                 buf->address = (void *)(agp_offset + offset);
1159                 buf->next = NULL;
1160                 buf->waiting = 0;
1161                 buf->pending = 0;
1162                 init_waitqueue_head(&buf->dma_wait);
1163                 buf->filp = NULL;
1164
1165                 buf->dev_priv_size = dev->driver->dev_priv_size;
1166                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1167                 if (!buf->dev_private) {
1168                         /* Set count correctly so we free the proper amount. */
1169                         entry->buf_count = count;
1170                         drm_cleanup_buf_error(dev, entry);
1171                         mutex_unlock(&dev->struct_mutex);
1172                         atomic_dec(&dev->buf_alloc);
1173                         return -ENOMEM;
1174                 }
1175                 memset(buf->dev_private, 0, buf->dev_priv_size);
1176
1177                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1178
1179                 offset += alignment;
1180                 entry->buf_count++;
1181                 byte_count += PAGE_SIZE << page_order;
1182         }
1183
1184         DRM_DEBUG("byte_count: %d\n", byte_count);
1185
1186         temp_buflist = drm_realloc(dma->buflist,
1187                                    dma->buf_count * sizeof(*dma->buflist),
1188                                    (dma->buf_count + entry->buf_count)
1189                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1190         if (!temp_buflist) {
1191                 /* Free the entry because it isn't valid */
1192                 drm_cleanup_buf_error(dev, entry);
1193                 mutex_unlock(&dev->struct_mutex);
1194                 atomic_dec(&dev->buf_alloc);
1195                 return -ENOMEM;
1196         }
1197         dma->buflist = temp_buflist;
1198
1199         for (i = 0; i < entry->buf_count; i++) {
1200                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1201         }
1202
1203         dma->buf_count += entry->buf_count;
1204         dma->seg_count += entry->seg_count;
1205         dma->page_count += byte_count >> PAGE_SHIFT;
1206         dma->byte_count += byte_count;
1207
1208         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1209         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1210
1211         mutex_unlock(&dev->struct_mutex);
1212
1213         request->count = entry->buf_count;
1214         request->size = size;
1215
1216         dma->flags = _DRM_DMA_USE_FB;
1217
1218         atomic_dec(&dev->buf_alloc);
1219         return 0;
1220 }
1221
1222
1223 /**
1224  * Add buffers for DMA transfers (ioctl).
1225  *
1226  * \param inode device inode.
1227  * \param filp file pointer.
1228  * \param cmd command.
1229  * \param arg pointer to a drm_buf_desc_t request.
1230  * \return zero on success or a negative number on failure.
1231  *
1232  * According with the memory type specified in drm_buf_desc::flags and the
1233  * build options, it dispatches the call either to addbufs_agp(),
1234  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1235  * PCI memory respectively.
1236  */
1237 int drm_addbufs(struct inode *inode, struct file *filp,
1238                 unsigned int cmd, unsigned long arg)
1239 {
1240         drm_buf_desc_t request;
1241         drm_file_t *priv = filp->private_data;
1242         drm_device_t *dev = priv->head->dev;
1243         int ret;
1244
1245         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1246                 return -EINVAL;
1247
1248         if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
1249                            sizeof(request)))
1250                 return -EFAULT;
1251
1252 #if __OS_HAS_AGP
1253         if (request.flags & _DRM_AGP_BUFFER)
1254                 ret = drm_addbufs_agp(dev, &request);
1255         else
1256 #endif
1257         if (request.flags & _DRM_SG_BUFFER)
1258                 ret = drm_addbufs_sg(dev, &request);
1259         else if (request.flags & _DRM_FB_BUFFER)
1260                 ret = drm_addbufs_fb(dev, &request);
1261         else
1262                 ret = drm_addbufs_pci(dev, &request);
1263
1264         if (ret == 0) {
1265                 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1266                         ret = -EFAULT;
1267                 }
1268         }
1269         return ret;
1270 }
1271
1272 /**
1273  * Get information about the buffer mappings.
1274  *
1275  * This was originally mean for debugging purposes, or by a sophisticated
1276  * client library to determine how best to use the available buffers (e.g.,
1277  * large buffers can be used for image transfer).
1278  *
1279  * \param inode device inode.
1280  * \param filp file pointer.
1281  * \param cmd command.
1282  * \param arg pointer to a drm_buf_info structure.
1283  * \return zero on success or a negative number on failure.
1284  *
1285  * Increments drm_device::buf_use while holding the drm_device::count_lock
1286  * lock, preventing of allocating more buffers after this call. Information
1287  * about each requested buffer is then copied into user space.
1288  */
1289 int drm_infobufs(struct inode *inode, struct file *filp,
1290                  unsigned int cmd, unsigned long arg)
1291 {
1292         drm_file_t *priv = filp->private_data;
1293         drm_device_t *dev = priv->head->dev;
1294         drm_device_dma_t *dma = dev->dma;
1295         drm_buf_info_t request;
1296         drm_buf_info_t __user *argp = (void __user *)arg;
1297         int i;
1298         int count;
1299
1300         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1301                 return -EINVAL;
1302
1303         if (!dma)
1304                 return -EINVAL;
1305
1306         spin_lock(&dev->count_lock);
1307         if (atomic_read(&dev->buf_alloc)) {
1308                 spin_unlock(&dev->count_lock);
1309                 return -EBUSY;
1310         }
1311         ++dev->buf_use;         /* Can't allocate more after this call */
1312         spin_unlock(&dev->count_lock);
1313
1314         if (copy_from_user(&request, argp, sizeof(request)))
1315                 return -EFAULT;
1316
1317         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1318                 if (dma->bufs[i].buf_count)
1319                         ++count;
1320         }
1321
1322         DRM_DEBUG("count = %d\n", count);
1323
1324         if (request.count >= count) {
1325                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1326                         if (dma->bufs[i].buf_count) {
1327                                 drm_buf_desc_t __user *to =
1328                                     &request.list[count];
1329                                 drm_buf_entry_t *from = &dma->bufs[i];
1330                                 drm_freelist_t *list = &dma->bufs[i].freelist;
1331                                 if (copy_to_user(&to->count,
1332                                                  &from->buf_count,
1333                                                  sizeof(from->buf_count)) ||
1334                                     copy_to_user(&to->size,
1335                                                  &from->buf_size,
1336                                                  sizeof(from->buf_size)) ||
1337                                     copy_to_user(&to->low_mark,
1338                                                  &list->low_mark,
1339                                                  sizeof(list->low_mark)) ||
1340                                     copy_to_user(&to->high_mark,
1341                                                  &list->high_mark,
1342                                                  sizeof(list->high_mark)))
1343                                         return -EFAULT;
1344
1345                                 DRM_DEBUG("%d %d %d %d %d\n",
1346                                           i,
1347                                           dma->bufs[i].buf_count,
1348                                           dma->bufs[i].buf_size,
1349                                           dma->bufs[i].freelist.low_mark,
1350                                           dma->bufs[i].freelist.high_mark);
1351                                 ++count;
1352                         }
1353                 }
1354         }
1355         request.count = count;
1356
1357         if (copy_to_user(argp, &request, sizeof(request)))
1358                 return -EFAULT;
1359
1360         return 0;
1361 }
1362
1363 /**
1364  * Specifies a low and high water mark for buffer allocation
1365  *
1366  * \param inode device inode.
1367  * \param filp file pointer.
1368  * \param cmd command.
1369  * \param arg a pointer to a drm_buf_desc structure.
1370  * \return zero on success or a negative number on failure.
1371  *
1372  * Verifies that the size order is bounded between the admissible orders and
1373  * updates the respective drm_device_dma::bufs entry low and high water mark.
1374  *
1375  * \note This ioctl is deprecated and mostly never used.
1376  */
1377 int drm_markbufs(struct inode *inode, struct file *filp,
1378                  unsigned int cmd, unsigned long arg)
1379 {
1380         drm_file_t *priv = filp->private_data;
1381         drm_device_t *dev = priv->head->dev;
1382         drm_device_dma_t *dma = dev->dma;
1383         drm_buf_desc_t request;
1384         int order;
1385         drm_buf_entry_t *entry;
1386
1387         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1388                 return -EINVAL;
1389
1390         if (!dma)
1391                 return -EINVAL;
1392
1393         if (copy_from_user(&request,
1394                            (drm_buf_desc_t __user *) arg, sizeof(request)))
1395                 return -EFAULT;
1396
1397         DRM_DEBUG("%d, %d, %d\n",
1398                   request.size, request.low_mark, request.high_mark);
1399         order = drm_order(request.size);
1400         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1401                 return -EINVAL;
1402         entry = &dma->bufs[order];
1403
1404         if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1405                 return -EINVAL;
1406         if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1407                 return -EINVAL;
1408
1409         entry->freelist.low_mark = request.low_mark;
1410         entry->freelist.high_mark = request.high_mark;
1411
1412         return 0;
1413 }
1414
1415 /**
1416  * Unreserve the buffers in list, previously reserved using drmDMA.
1417  *
1418  * \param inode device inode.
1419  * \param filp file pointer.
1420  * \param cmd command.
1421  * \param arg pointer to a drm_buf_free structure.
1422  * \return zero on success or a negative number on failure.
1423  *
1424  * Calls free_buffer() for each used buffer.
1425  * This function is primarily used for debugging.
1426  */
1427 int drm_freebufs(struct inode *inode, struct file *filp,
1428                  unsigned int cmd, unsigned long arg)
1429 {
1430         drm_file_t *priv = filp->private_data;
1431         drm_device_t *dev = priv->head->dev;
1432         drm_device_dma_t *dma = dev->dma;
1433         drm_buf_free_t request;
1434         int i;
1435         int idx;
1436         drm_buf_t *buf;
1437
1438         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1439                 return -EINVAL;
1440
1441         if (!dma)
1442                 return -EINVAL;
1443
1444         if (copy_from_user(&request,
1445                            (drm_buf_free_t __user *) arg, sizeof(request)))
1446                 return -EFAULT;
1447
1448         DRM_DEBUG("%d\n", request.count);
1449         for (i = 0; i < request.count; i++) {
1450                 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1451                         return -EFAULT;
1452                 if (idx < 0 || idx >= dma->buf_count) {
1453                         DRM_ERROR("Index %d (of %d max)\n",
1454                                   idx, dma->buf_count - 1);
1455                         return -EINVAL;
1456                 }
1457                 buf = dma->buflist[idx];
1458                 if (buf->filp != filp) {
1459                         DRM_ERROR("Process %d freeing buffer not owned\n",
1460                                   current->pid);
1461                         return -EINVAL;
1462                 }
1463                 drm_free_buffer(dev, buf);
1464         }
1465
1466         return 0;
1467 }
1468
1469 /**
1470  * Maps all of the DMA buffers into client-virtual space (ioctl).
1471  *
1472  * \param inode device inode.
1473  * \param filp file pointer.
1474  * \param cmd command.
1475  * \param arg pointer to a drm_buf_map structure.
1476  * \return zero on success or a negative number on failure.
1477  *
1478  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1479  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1480  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1481  * drm_mmap_dma().
1482  */
1483 int drm_mapbufs(struct inode *inode, struct file *filp,
1484                 unsigned int cmd, unsigned long arg)
1485 {
1486         drm_file_t *priv = filp->private_data;
1487         drm_device_t *dev = priv->head->dev;
1488         drm_device_dma_t *dma = dev->dma;
1489         drm_buf_map_t __user *argp = (void __user *)arg;
1490         int retcode = 0;
1491         const int zero = 0;
1492         unsigned long virtual;
1493         unsigned long address;
1494         drm_buf_map_t request;
1495         int i;
1496
1497         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1498                 return -EINVAL;
1499
1500         if (!dma)
1501                 return -EINVAL;
1502
1503         spin_lock(&dev->count_lock);
1504         if (atomic_read(&dev->buf_alloc)) {
1505                 spin_unlock(&dev->count_lock);
1506                 return -EBUSY;
1507         }
1508         dev->buf_use++;         /* Can't allocate more after this call */
1509         spin_unlock(&dev->count_lock);
1510
1511         if (copy_from_user(&request, argp, sizeof(request)))
1512                 return -EFAULT;
1513
1514         if (request.count >= dma->buf_count) {
1515                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1516                     || (drm_core_check_feature(dev, DRIVER_SG)
1517                         && (dma->flags & _DRM_DMA_USE_SG))
1518                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1519                         && (dma->flags & _DRM_DMA_USE_FB))) {
1520                         drm_map_t *map = dev->agp_buffer_map;
1521                         unsigned long token = dev->agp_buffer_token;
1522
1523                         if (!map) {
1524                                 retcode = -EINVAL;
1525                                 goto done;
1526                         }
1527
1528                         down_write(&current->mm->mmap_sem);
1529                         virtual = do_mmap(filp, 0, map->size,
1530                                           PROT_READ | PROT_WRITE,
1531                                           MAP_SHARED, token);
1532                         up_write(&current->mm->mmap_sem);
1533                 } else {
1534                         down_write(&current->mm->mmap_sem);
1535                         virtual = do_mmap(filp, 0, dma->byte_count,
1536                                           PROT_READ | PROT_WRITE,
1537                                           MAP_SHARED, 0);
1538                         up_write(&current->mm->mmap_sem);
1539                 }
1540                 if (virtual > -1024UL) {
1541                         /* Real error */
1542                         retcode = (signed long)virtual;
1543                         goto done;
1544                 }
1545                 request.virtual = (void __user *)virtual;
1546
1547                 for (i = 0; i < dma->buf_count; i++) {
1548                         if (copy_to_user(&request.list[i].idx,
1549                                          &dma->buflist[i]->idx,
1550                                          sizeof(request.list[0].idx))) {
1551                                 retcode = -EFAULT;
1552                                 goto done;
1553                         }
1554                         if (copy_to_user(&request.list[i].total,
1555                                          &dma->buflist[i]->total,
1556                                          sizeof(request.list[0].total))) {
1557                                 retcode = -EFAULT;
1558                                 goto done;
1559                         }
1560                         if (copy_to_user(&request.list[i].used,
1561                                          &zero, sizeof(zero))) {
1562                                 retcode = -EFAULT;
1563                                 goto done;
1564                         }
1565                         address = virtual + dma->buflist[i]->offset;    /* *** */
1566                         if (copy_to_user(&request.list[i].address,
1567                                          &address, sizeof(address))) {
1568                                 retcode = -EFAULT;
1569                                 goto done;
1570                         }
1571                 }
1572         }
1573       done:
1574         request.count = dma->buf_count;
1575         DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1576
1577         if (copy_to_user(argp, &request, sizeof(request)))
1578                 return -EFAULT;
1579
1580         return retcode;
1581 }
1582
1583 /**
1584  * Compute size order.  Returns the exponent of the smaller power of two which
1585  * is greater or equal to given number.
1586  *
1587  * \param size size.
1588  * \return order.
1589  *
1590  * \todo Can be made faster.
1591  */
1592 int drm_order(unsigned long size)
1593 {
1594         int order;
1595         unsigned long tmp;
1596
1597         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1598
1599         if (size & (size - 1))
1600                 ++order;
1601
1602         return order;
1603 }
1604 EXPORT_SYMBOL(drm_order);
1605
1606