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;
  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                                          PAGE_SHIFT, DRM_MAP_HASH_OFFSET);
  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 = drm_ioremap(map->offset, map->size, dev);
 182                 break;
 183
 184         case _DRM_SHM:
 185                 map->handle = vmalloc_32(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                         drm_ioremapfree(map->handle, map->size, dev);
 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                         drm_ioremapfree(map->handle, map->size, dev);
 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;
 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, r_list->user_token);
 351                         drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 352                         break;
 353                 }
 354         }
 355
 356         /* List has wrapped around to the head pointer, or it's empty and we
 357          * didn't find anything.
 358          */
 359         if (list == (&dev->maplist->head)) {
 360                 return -EINVAL;
 361         }
 362
 363         switch (map->type) {
 364         case _DRM_REGISTERS:
 365                 drm_ioremapfree(map->handle, map->size, dev);
 366                 /* FALLTHROUGH */
 367         case _DRM_FRAME_BUFFER:
 368                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 369                         int retcode;
 370                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 371                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 372                 }
 373                 break;
 374         case _DRM_SHM:
 375                 vfree(map->handle);
 376                 break;
 377         case _DRM_AGP:
 378         case _DRM_SCATTER_GATHER:
 379                 break;
 380         case _DRM_CONSISTENT:
 381                 dmah.vaddr = map->handle;
 382                 dmah.busaddr = map->offset;
 383                 dmah.size = map->size;
 384                 __drm_pci_free(dev, &dmah);
 385                 break;
 386         }
 387         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 388
 389         return 0;
 390 }
 391
 392 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
 393 {
 394         int ret;
 395
 396         mutex_lock(&dev->struct_mutex);
 397         ret = drm_rmmap_locked(dev, map);
 398         mutex_unlock(&dev->struct_mutex);
 399
 400         return ret;
 401 }
 402
 403 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 404  * the last close of the device, and this is necessary for cleanup when things
 405  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 406  * like a pointless exercise since they're going away anyway.
 407  *
 408  * One use case might be after addmap is allowed for normal users for SHM and
 409  * gets used by drivers that the server doesn't need to care about.  This seems
 410  * unlikely.
 411  */
 412 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 413                     unsigned int cmd, unsigned long arg)
 414 {
 415         drm_file_t *priv = filp->private_data;
 416         drm_device_t *dev = priv->head->dev;
 417         drm_map_t request;
 418         drm_local_map_t *map = NULL;
 419         struct list_head *list;
 420         int ret;
 421
 422         if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
 423                 return -EFAULT;
 424         }
 425
 426         mutex_lock(&dev->struct_mutex);
 427         list_for_each(list, &dev->maplist->head) {
 428                 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 429
 430                 if (r_list->map &&
 431                     r_list->user_token == (unsigned long)request.handle &&
 432                     r_list->map->flags & _DRM_REMOVABLE) {
 433                         map = r_list->map;
 434                         break;
 435                 }
 436         }
 437
 438         /* List has wrapped around to the head pointer, or its empty we didn't
 439          * find anything.
 440          */
 441         if (list == (&dev->maplist->head)) {
 442                 mutex_unlock(&dev->struct_mutex);
 443                 return -EINVAL;
 444         }
 445
 446         if (!map) {
 447                 mutex_unlock(&dev->struct_mutex);
 448                 return -EINVAL;
 449         }
 450
 451         /* Register and framebuffer maps are permanent */
 452         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 453                 mutex_unlock(&dev->struct_mutex);
 454                 return 0;
 455         }
 456
 457         ret = drm_rmmap_locked(dev, map);
 458
 459         mutex_unlock(&dev->struct_mutex);
 460
 461         return ret;
 462 }
 463
 464 /**
 465  * Cleanup after an error on one of the addbufs() functions.
 466  *
 467  * \param dev DRM device.
 468  * \param entry buffer entry where the error occurred.
 469  *
 470  * Frees any pages and buffers associated with the given entry.
 471  */
 472 static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
 473 {
 474         int i;
 475
 476         if (entry->seg_count) {
 477                 for (i = 0; i < entry->seg_count; i++) {
 478                         if (entry->seglist[i]) {
 479                                 drm_pci_free(dev, entry->seglist[i]);
 480                         }
 481                 }
 482                 drm_free(entry->seglist,
 483                          entry->seg_count *
 484                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 485
 486                 entry->seg_count = 0;
 487         }
 488
 489         if (entry->buf_count) {
 490                 for (i = 0; i < entry->buf_count; i++) {
 491                         if (entry->buflist[i].dev_private) {
 492                                 drm_free(entry->buflist[i].dev_private,
 493                                          entry->buflist[i].dev_priv_size,
 494                                          DRM_MEM_BUFS);
 495                         }
 496                 }
 497                 drm_free(entry->buflist,
 498                          entry->buf_count *
 499                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 500
 501                 entry->buf_count = 0;
 502         }
 503 }
 504
 505 #if __OS_HAS_AGP
 506 /**
 507  * Add AGP buffers for DMA transfers.
 508  *
 509  * \param dev drm_device_t to which the buffers are to be added.
 510  * \param request pointer to a drm_buf_desc_t describing the request.
 511  * \return zero on success or a negative number on failure.
 512  *
 513  * After some sanity checks creates a drm_buf structure for each buffer and
 514  * reallocates the buffer list of the same size order to accommodate the new
 515  * buffers.
 516  */
 517 int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
 518 {
 519         drm_device_dma_t *dma = dev->dma;
 520         drm_buf_entry_t *entry;
 521         drm_buf_t *buf;
 522         unsigned long offset;
 523         unsigned long agp_offset;
 524         int count;
 525         int order;
 526         int size;
 527         int alignment;
 528         int page_order;
 529         int total;
 530         int byte_count;
 531         int i;
 532         drm_buf_t **temp_buflist;
 533
 534         if (!dma)
 535                 return -EINVAL;
 536
 537         count = request->count;
 538         order = drm_order(request->size);
 539         size = 1 << order;
 540
 541         alignment = (request->flags & _DRM_PAGE_ALIGN)
 542             ? PAGE_ALIGN(size) : size;
 543         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 544         total = PAGE_SIZE << page_order;
 545
 546         byte_count = 0;
 547         agp_offset = dev->agp->base + request->agp_start;
 548
 549         DRM_DEBUG("count:      %d\n", count);
 550         DRM_DEBUG("order:      %d\n", order);
 551         DRM_DEBUG("size:       %d\n", size);
 552         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 553         DRM_DEBUG("alignment:  %d\n", alignment);
 554         DRM_DEBUG("page_order: %d\n", page_order);
 555         DRM_DEBUG("total:      %d\n", total);
 556
 557         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 558                 return -EINVAL;
 559         if (dev->queue_count)
 560                 return -EBUSY;  /* Not while in use */
 561
 562         spin_lock(&dev->count_lock);
 563         if (dev->buf_use) {
 564                 spin_unlock(&dev->count_lock);
 565                 return -EBUSY;
 566         }
 567         atomic_inc(&dev->buf_alloc);
 568         spin_unlock(&dev->count_lock);
 569
 570         mutex_lock(&dev->struct_mutex);
 571         entry = &dma->bufs[order];
 572         if (entry->buf_count) {
 573                 mutex_unlock(&dev->struct_mutex);
 574                 atomic_dec(&dev->buf_alloc);
 575                 return -ENOMEM; /* May only call once for each order */
 576         }
 577
 578         if (count < 0 || count > 4096) {
 579                 mutex_unlock(&dev->struct_mutex);
 580                 atomic_dec(&dev->buf_alloc);
 581                 return -EINVAL;
 582         }
 583
 584         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 585                                    DRM_MEM_BUFS);
 586         if (!entry->buflist) {
 587                 mutex_unlock(&dev->struct_mutex);
 588                 atomic_dec(&dev->buf_alloc);
 589                 return -ENOMEM;
 590         }
 591         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 592
 593         entry->buf_size = size;
 594         entry->page_order = page_order;
 595
 596         offset = 0;
 597
 598         while (entry->buf_count < count) {
 599                 buf = &entry->buflist[entry->buf_count];
 600                 buf->idx = dma->buf_count + entry->buf_count;
 601                 buf->total = alignment;
 602                 buf->order = order;
 603                 buf->used = 0;
 604
 605                 buf->offset = (dma->byte_count + offset);
 606                 buf->bus_address = agp_offset + offset;
 607                 buf->address = (void *)(agp_offset + offset);
 608                 buf->next = NULL;
 609                 buf->waiting = 0;
 610                 buf->pending = 0;
 611                 init_waitqueue_head(&buf->dma_wait);
 612                 buf->filp = NULL;
 613
 614                 buf->dev_priv_size = dev->driver->dev_priv_size;
 615                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 616                 if (!buf->dev_private) {
 617                         /* Set count correctly so we free the proper amount. */
 618                         entry->buf_count = count;
 619                         drm_cleanup_buf_error(dev, entry);
 620                         mutex_unlock(&dev->struct_mutex);
 621                         atomic_dec(&dev->buf_alloc);
 622                         return -ENOMEM;
 623                 }
 624                 memset(buf->dev_private, 0, buf->dev_priv_size);
 625
 626                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 627
 628                 offset += alignment;
 629                 entry->buf_count++;
 630                 byte_count += PAGE_SIZE << page_order;
 631         }
 632
 633         DRM_DEBUG("byte_count: %d\n", byte_count);
 634
 635         temp_buflist = drm_realloc(dma->buflist,
 636                                    dma->buf_count * sizeof(*dma->buflist),
 637                                    (dma->buf_count + entry->buf_count)
 638                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 639         if (!temp_buflist) {
 640                 /* Free the entry because it isn't valid */
 641                 drm_cleanup_buf_error(dev, entry);
 642                 mutex_unlock(&dev->struct_mutex);
 643                 atomic_dec(&dev->buf_alloc);
 644                 return -ENOMEM;
 645         }
 646         dma->buflist = temp_buflist;
 647
 648         for (i = 0; i < entry->buf_count; i++) {
 649                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 650         }
 651
 652         dma->buf_count += entry->buf_count;
 653         dma->seg_count += entry->seg_count;
 654         dma->page_count += byte_count >> PAGE_SHIFT;
 655         dma->byte_count += byte_count;
 656
 657         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 658         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 659
 660         mutex_unlock(&dev->struct_mutex);
 661
 662         request->count = entry->buf_count;
 663         request->size = size;
 664
 665         dma->flags = _DRM_DMA_USE_AGP;
 666
 667         atomic_dec(&dev->buf_alloc);
 668         return 0;
 669 }
 670 EXPORT_SYMBOL(drm_addbufs_agp);
 671 #endif                          /* __OS_HAS_AGP */
 672
 673 int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
 674 {
 675         drm_device_dma_t *dma = dev->dma;
 676         int count;
 677         int order;
 678         int size;
 679         int total;
 680         int page_order;
 681         drm_buf_entry_t *entry;
 682         drm_dma_handle_t *dmah;
 683         drm_buf_t *buf;
 684         int alignment;
 685         unsigned long offset;
 686         int i;
 687         int byte_count;
 688         int page_count;
 689         unsigned long *temp_pagelist;
 690         drm_buf_t **temp_buflist;
 691
 692         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 693                 return -EINVAL;
 694
 695         if (!dma)
 696                 return -EINVAL;
 697
 698         if (!capable(CAP_SYS_ADMIN))
 699                 return -EPERM;
 700
 701         count = request->count;
 702         order = drm_order(request->size);
 703         size = 1 << order;
 704
 705         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 706                   request->count, request->size, size, order, dev->queue_count);
 707
 708         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 709                 return -EINVAL;
 710         if (dev->queue_count)
 711                 return -EBUSY;  /* Not while in use */
 712
 713         alignment = (request->flags & _DRM_PAGE_ALIGN)
 714             ? PAGE_ALIGN(size) : size;
 715         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 716         total = PAGE_SIZE << page_order;
 717
 718         spin_lock(&dev->count_lock);
 719         if (dev->buf_use) {
 720                 spin_unlock(&dev->count_lock);
 721                 return -EBUSY;
 722         }
 723         atomic_inc(&dev->buf_alloc);
 724         spin_unlock(&dev->count_lock);
 725
 726         mutex_lock(&dev->struct_mutex);
 727         entry = &dma->bufs[order];
 728         if (entry->buf_count) {
 729                 mutex_unlock(&dev->struct_mutex);
 730                 atomic_dec(&dev->buf_alloc);
 731                 return -ENOMEM; /* May only call once for each order */
 732         }
 733
 734         if (count < 0 || count > 4096) {
 735                 mutex_unlock(&dev->struct_mutex);
 736                 atomic_dec(&dev->buf_alloc);
 737                 return -EINVAL;
 738         }
 739
 740         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 741                                    DRM_MEM_BUFS);
 742         if (!entry->buflist) {
 743                 mutex_unlock(&dev->struct_mutex);
 744                 atomic_dec(&dev->buf_alloc);
 745                 return -ENOMEM;
 746         }
 747         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 748
 749         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 750                                    DRM_MEM_SEGS);
 751         if (!entry->seglist) {
 752                 drm_free(entry->buflist,
 753                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 754                 mutex_unlock(&dev->struct_mutex);
 755                 atomic_dec(&dev->buf_alloc);
 756                 return -ENOMEM;
 757         }
 758         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 759
 760         /* Keep the original pagelist until we know all the allocations
 761          * have succeeded
 762          */
 763         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 764                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 765         if (!temp_pagelist) {
 766                 drm_free(entry->buflist,
 767                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 768                 drm_free(entry->seglist,
 769                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 770                 mutex_unlock(&dev->struct_mutex);
 771                 atomic_dec(&dev->buf_alloc);
 772                 return -ENOMEM;
 773         }
 774         memcpy(temp_pagelist,
 775                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 776         DRM_DEBUG("pagelist: %d entries\n",
 777                   dma->page_count + (count << page_order));
 778
 779         entry->buf_size = size;
 780         entry->page_order = page_order;
 781         byte_count = 0;
 782         page_count = 0;
 783
 784         while (entry->buf_count < count) {
 785
 786                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 787
 788                 if (!dmah) {
 789                         /* Set count correctly so we free the proper amount. */
 790                         entry->buf_count = count;
 791                         entry->seg_count = count;
 792                         drm_cleanup_buf_error(dev, entry);
 793                         drm_free(temp_pagelist,
 794                                  (dma->page_count + (count << page_order))
 795                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 796                         mutex_unlock(&dev->struct_mutex);
 797                         atomic_dec(&dev->buf_alloc);
 798                         return -ENOMEM;
 799                 }
 800                 entry->seglist[entry->seg_count++] = dmah;
 801                 for (i = 0; i < (1 << page_order); i++) {
 802                         DRM_DEBUG("page %d @ 0x%08lx\n",
 803                                   dma->page_count + page_count,
 804                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 805                         temp_pagelist[dma->page_count + page_count++]
 806                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 807                 }
 808                 for (offset = 0;
 809                      offset + size <= total && entry->buf_count < count;
 810                      offset += alignment, ++entry->buf_count) {
 811                         buf = &entry->buflist[entry->buf_count];
 812                         buf->idx = dma->buf_count + entry->buf_count;
 813                         buf->total = alignment;
 814                         buf->order = order;
 815                         buf->used = 0;
 816                         buf->offset = (dma->byte_count + byte_count + offset);
 817                         buf->address = (void *)(dmah->vaddr + offset);
 818                         buf->bus_address = dmah->busaddr + offset;
 819                         buf->next = NULL;
 820                         buf->waiting = 0;
 821                         buf->pending = 0;
 822                         init_waitqueue_head(&buf->dma_wait);
 823                         buf->filp = NULL;
 824
 825                         buf->dev_priv_size = dev->driver->dev_priv_size;
 826                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 827                                                      DRM_MEM_BUFS);
 828                         if (!buf->dev_private) {
 829                                 /* Set count correctly so we free the proper amount. */
 830                                 entry->buf_count = count;
 831                                 entry->seg_count = count;
 832                                 drm_cleanup_buf_error(dev, entry);
 833                                 drm_free(temp_pagelist,
 834                                          (dma->page_count +
 835                                           (count << page_order))
 836                                          * sizeof(*dma->pagelist),
 837                                          DRM_MEM_PAGES);
 838                                 mutex_unlock(&dev->struct_mutex);
 839                                 atomic_dec(&dev->buf_alloc);
 840                                 return -ENOMEM;
 841                         }
 842                         memset(buf->dev_private, 0, buf->dev_priv_size);
 843
 844                         DRM_DEBUG("buffer %d @ %p\n",
 845                                   entry->buf_count, buf->address);
 846                 }
 847                 byte_count += PAGE_SIZE << page_order;
 848         }
 849
 850         temp_buflist = drm_realloc(dma->buflist,
 851                                    dma->buf_count * sizeof(*dma->buflist),
 852                                    (dma->buf_count + entry->buf_count)
 853                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 854         if (!temp_buflist) {
 855                 /* Free the entry because it isn't valid */
 856                 drm_cleanup_buf_error(dev, entry);
 857                 drm_free(temp_pagelist,
 858                          (dma->page_count + (count << page_order))
 859                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 860                 mutex_unlock(&dev->struct_mutex);
 861                 atomic_dec(&dev->buf_alloc);
 862                 return -ENOMEM;
 863         }
 864         dma->buflist = temp_buflist;
 865
 866         for (i = 0; i < entry->buf_count; i++) {
 867                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 868         }
 869
 870         /* No allocations failed, so now we can replace the orginal pagelist
 871          * with the new one.
 872          */
 873         if (dma->page_count) {
 874                 drm_free(dma->pagelist,
 875                          dma->page_count * sizeof(*dma->pagelist),
 876                          DRM_MEM_PAGES);
 877         }
 878         dma->pagelist = temp_pagelist;
 879
 880         dma->buf_count += entry->buf_count;
 881         dma->seg_count += entry->seg_count;
 882         dma->page_count += entry->seg_count << page_order;
 883         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 884
 885         mutex_unlock(&dev->struct_mutex);
 886
 887         request->count = entry->buf_count;
 888         request->size = size;
 889
 890         if (request->flags & _DRM_PCI_BUFFER_RO)
 891                 dma->flags = _DRM_DMA_USE_PCI_RO;
 892
 893         atomic_dec(&dev->buf_alloc);
 894         return 0;
 895
 896 }
 897 EXPORT_SYMBOL(drm_addbufs_pci);
 898
 899 static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
 900 {
 901         drm_device_dma_t *dma = dev->dma;
 902         drm_buf_entry_t *entry;
 903         drm_buf_t *buf;
 904         unsigned long offset;
 905         unsigned long agp_offset;
 906         int count;
 907         int order;
 908         int size;
 909         int alignment;
 910         int page_order;
 911         int total;
 912         int byte_count;
 913         int i;
 914         drm_buf_t **temp_buflist;
 915
 916         if (!drm_core_check_feature(dev, DRIVER_SG))
 917                 return -EINVAL;
 918
 919         if (!dma)
 920                 return -EINVAL;
 921
 922         if (!capable(CAP_SYS_ADMIN))
 923                 return -EPERM;
 924
 925         count = request->count;
 926         order = drm_order(request->size);
 927         size = 1 << order;
 928
 929         alignment = (request->flags & _DRM_PAGE_ALIGN)
 930             ? PAGE_ALIGN(size) : size;
 931         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 932         total = PAGE_SIZE << page_order;
 933
 934         byte_count = 0;
 935         agp_offset = request->agp_start;
 936
 937         DRM_DEBUG("count:      %d\n", count);
 938         DRM_DEBUG("order:      %d\n", order);
 939         DRM_DEBUG("size:       %d\n", size);
 940         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 941         DRM_DEBUG("alignment:  %d\n", alignment);
 942         DRM_DEBUG("page_order: %d\n", page_order);
 943         DRM_DEBUG("total:      %d\n", total);
 944
 945         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 946                 return -EINVAL;
 947         if (dev->queue_count)
 948                 return -EBUSY;  /* Not while in use */
 949
 950         spin_lock(&dev->count_lock);
 951         if (dev->buf_use) {
 952                 spin_unlock(&dev->count_lock);
 953                 return -EBUSY;
 954         }
 955         atomic_inc(&dev->buf_alloc);
 956         spin_unlock(&dev->count_lock);
 957
 958         mutex_lock(&dev->struct_mutex);
 959         entry = &dma->bufs[order];
 960         if (entry->buf_count) {
 961                 mutex_unlock(&dev->struct_mutex);
 962                 atomic_dec(&dev->buf_alloc);
 963                 return -ENOMEM; /* May only call once for each order */
 964         }
 965
 966         if (count < 0 || count > 4096) {
 967                 mutex_unlock(&dev->struct_mutex);
 968                 atomic_dec(&dev->buf_alloc);
 969                 return -EINVAL;
 970         }
 971
 972         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 973                                    DRM_MEM_BUFS);
 974         if (!entry->buflist) {
 975                 mutex_unlock(&dev->struct_mutex);
 976                 atomic_dec(&dev->buf_alloc);
 977                 return -ENOMEM;
 978         }
 979         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 980
 981         entry->buf_size = size;
 982         entry->page_order = page_order;
 983
 984         offset = 0;
 985
 986         while (entry->buf_count < count) {
 987                 buf = &entry->buflist[entry->buf_count];
 988                 buf->idx = dma->buf_count + entry->buf_count;
 989                 buf->total = alignment;
 990                 buf->order = order;
 991                 buf->used = 0;
 992
 993                 buf->offset = (dma->byte_count + offset);
 994                 buf->bus_address = agp_offset + offset;
 995                 buf->address = (void *)(agp_offset + offset
 996                                         + (unsigned long)dev->sg->virtual);
 997                 buf->next = NULL;
 998                 buf->waiting = 0;
 999                 buf->pending = 0;
1000                 init_waitqueue_head(&buf->dma_wait);
1001                 buf->filp = NULL;
1002
1003                 buf->dev_priv_size = dev->driver->dev_priv_size;
1004                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1005                 if (!buf->dev_private) {
1006                         /* Set count correctly so we free the proper amount. */
1007                         entry->buf_count = count;
1008                         drm_cleanup_buf_error(dev, entry);
1009                         mutex_unlock(&dev->struct_mutex);
1010                         atomic_dec(&dev->buf_alloc);
1011                         return -ENOMEM;
1012                 }
1013
1014                 memset(buf->dev_private, 0, buf->dev_priv_size);
1015
1016                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1017
1018                 offset += alignment;
1019                 entry->buf_count++;
1020                 byte_count += PAGE_SIZE << page_order;
1021         }
1022
1023         DRM_DEBUG("byte_count: %d\n", byte_count);
1024
1025         temp_buflist = drm_realloc(dma->buflist,
1026                                    dma->buf_count * sizeof(*dma->buflist),
1027                                    (dma->buf_count + entry->buf_count)
1028                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1029         if (!temp_buflist) {
1030                 /* Free the entry because it isn't valid */
1031                 drm_cleanup_buf_error(dev, entry);
1032                 mutex_unlock(&dev->struct_mutex);
1033                 atomic_dec(&dev->buf_alloc);
1034                 return -ENOMEM;
1035         }
1036         dma->buflist = temp_buflist;
1037
1038         for (i = 0; i < entry->buf_count; i++) {
1039                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1040         }
1041
1042         dma->buf_count += entry->buf_count;
1043         dma->seg_count += entry->seg_count;
1044         dma->page_count += byte_count >> PAGE_SHIFT;
1045         dma->byte_count += byte_count;
1046
1047         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1048         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1049
1050         mutex_unlock(&dev->struct_mutex);
1051
1052         request->count = entry->buf_count;
1053         request->size = size;
1054
1055         dma->flags = _DRM_DMA_USE_SG;
1056
1057         atomic_dec(&dev->buf_alloc);
1058         return 0;
1059 }
1060
1061 static int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
1062 {
1063         drm_device_dma_t *dma = dev->dma;
1064         drm_buf_entry_t *entry;
1065         drm_buf_t *buf;
1066         unsigned long offset;
1067         unsigned long agp_offset;
1068         int count;
1069         int order;
1070         int size;
1071         int alignment;
1072         int page_order;
1073         int total;
1074         int byte_count;
1075         int i;
1076         drm_buf_t **temp_buflist;
1077
1078         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1079                 return -EINVAL;
1080
1081         if (!dma)
1082                 return -EINVAL;
1083
1084         if (!capable(CAP_SYS_ADMIN))
1085                 return -EPERM;
1086
1087         count = request->count;
1088         order = drm_order(request->size);
1089         size = 1 << order;
1090
1091         alignment = (request->flags & _DRM_PAGE_ALIGN)
1092             ? PAGE_ALIGN(size) : size;
1093         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1094         total = PAGE_SIZE << page_order;
1095
1096         byte_count = 0;
1097         agp_offset = request->agp_start;
1098
1099         DRM_DEBUG("count:      %d\n", count);
1100         DRM_DEBUG("order:      %d\n", order);
1101         DRM_DEBUG("size:       %d\n", size);
1102         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1103         DRM_DEBUG("alignment:  %d\n", alignment);
1104         DRM_DEBUG("page_order: %d\n", page_order);
1105         DRM_DEBUG("total:      %d\n", total);
1106
1107         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1108                 return -EINVAL;
1109         if (dev->queue_count)
1110                 return -EBUSY;  /* Not while in use */
1111
1112         spin_lock(&dev->count_lock);
1113         if (dev->buf_use) {
1114                 spin_unlock(&dev->count_lock);
1115                 return -EBUSY;
1116         }
1117         atomic_inc(&dev->buf_alloc);
1118         spin_unlock(&dev->count_lock);
1119
1120         mutex_lock(&dev->struct_mutex);
1121         entry = &dma->bufs[order];
1122         if (entry->buf_count) {
1123                 mutex_unlock(&dev->struct_mutex);
1124                 atomic_dec(&dev->buf_alloc);
1125                 return -ENOMEM; /* May only call once for each order */
1126         }
1127
1128         if (count < 0 || count > 4096) {
1129                 mutex_unlock(&dev->struct_mutex);
1130                 atomic_dec(&dev->buf_alloc);
1131                 return -EINVAL;
1132         }
1133
1134         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1135                                    DRM_MEM_BUFS);
1136         if (!entry->buflist) {
1137                 mutex_unlock(&dev->struct_mutex);
1138                 atomic_dec(&dev->buf_alloc);
1139                 return -ENOMEM;
1140         }
1141         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1142
1143         entry->buf_size = size;
1144         entry->page_order = page_order;
1145
1146         offset = 0;
1147
1148         while (entry->buf_count < count) {
1149                 buf = &entry->buflist[entry->buf_count];
1150                 buf->idx = dma->buf_count + entry->buf_count;
1151                 buf->total = alignment;
1152                 buf->order = order;
1153                 buf->used = 0;
1154
1155                 buf->offset = (dma->byte_count + offset);
1156                 buf->bus_address = agp_offset + offset;
1157                 buf->address = (void *)(agp_offset + offset);
1158                 buf->next = NULL;
1159                 buf->waiting = 0;
1160                 buf->pending = 0;
1161                 init_waitqueue_head(&buf->dma_wait);
1162                 buf->filp = NULL;
1163
1164                 buf->dev_priv_size = dev->driver->dev_priv_size;
1165                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1166                 if (!buf->dev_private) {
1167                         /* Set count correctly so we free the proper amount. */
1168                         entry->buf_count = count;
1169                         drm_cleanup_buf_error(dev, entry);
1170                         mutex_unlock(&dev->struct_mutex);
1171                         atomic_dec(&dev->buf_alloc);
1172                         return -ENOMEM;
1173                 }
1174                 memset(buf->dev_private, 0, buf->dev_priv_size);
1175
1176                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1177
1178                 offset += alignment;
1179                 entry->buf_count++;
1180                 byte_count += PAGE_SIZE << page_order;
1181         }
1182
1183         DRM_DEBUG("byte_count: %d\n", byte_count);
1184
1185         temp_buflist = drm_realloc(dma->buflist,
1186                                    dma->buf_count * sizeof(*dma->buflist),
1187                                    (dma->buf_count + entry->buf_count)
1188                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1189         if (!temp_buflist) {
1190                 /* Free the entry because it isn't valid */
1191                 drm_cleanup_buf_error(dev, entry);
1192                 mutex_unlock(&dev->struct_mutex);
1193                 atomic_dec(&dev->buf_alloc);
1194                 return -ENOMEM;
1195         }
1196         dma->buflist = temp_buflist;
1197
1198         for (i = 0; i < entry->buf_count; i++) {
1199                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1200         }
1201
1202         dma->buf_count += entry->buf_count;
1203         dma->seg_count += entry->seg_count;
1204         dma->page_count += byte_count >> PAGE_SHIFT;
1205         dma->byte_count += byte_count;
1206
1207         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1208         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1209
1210         mutex_unlock(&dev->struct_mutex);
1211
1212         request->count = entry->buf_count;
1213         request->size = size;
1214
1215         dma->flags = _DRM_DMA_USE_FB;
1216
1217         atomic_dec(&dev->buf_alloc);
1218         return 0;
1219 }
1220
1221
1222 /**
1223  * Add buffers for DMA transfers (ioctl).
1224  *
1225  * \param inode device inode.
1226  * \param filp file pointer.
1227  * \param cmd command.
1228  * \param arg pointer to a drm_buf_desc_t request.
1229  * \return zero on success or a negative number on failure.
1230  *
1231  * According with the memory type specified in drm_buf_desc::flags and the
1232  * build options, it dispatches the call either to addbufs_agp(),
1233  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1234  * PCI memory respectively.
1235  */
1236 int drm_addbufs(struct inode *inode, struct file *filp,
1237                 unsigned int cmd, unsigned long arg)
1238 {
1239         drm_buf_desc_t request;
1240         drm_file_t *priv = filp->private_data;
1241         drm_device_t *dev = priv->head->dev;
1242         int ret;
1243
1244         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1245                 return -EINVAL;
1246
1247         if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
1248                            sizeof(request)))
1249                 return -EFAULT;
1250
1251 #if __OS_HAS_AGP
1252         if (request.flags & _DRM_AGP_BUFFER)
1253                 ret = drm_addbufs_agp(dev, &request);
1254         else
1255 #endif
1256         if (request.flags & _DRM_SG_BUFFER)
1257                 ret = drm_addbufs_sg(dev, &request);
1258         else if (request.flags & _DRM_FB_BUFFER)
1259                 ret = drm_addbufs_fb(dev, &request);
1260         else
1261                 ret = drm_addbufs_pci(dev, &request);
1262
1263         if (ret == 0) {
1264                 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1265                         ret = -EFAULT;
1266                 }
1267         }
1268         return ret;
1269 }
1270
1271 /**
1272  * Get information about the buffer mappings.
1273  *
1274  * This was originally mean for debugging purposes, or by a sophisticated
1275  * client library to determine how best to use the available buffers (e.g.,
1276  * large buffers can be used for image transfer).
1277  *
1278  * \param inode device inode.
1279  * \param filp file pointer.
1280  * \param cmd command.
1281  * \param arg pointer to a drm_buf_info structure.
1282  * \return zero on success or a negative number on failure.
1283  *
1284  * Increments drm_device::buf_use while holding the drm_device::count_lock
1285  * lock, preventing of allocating more buffers after this call. Information
1286  * about each requested buffer is then copied into user space.
1287  */
1288 int drm_infobufs(struct inode *inode, struct file *filp,
1289                  unsigned int cmd, unsigned long arg)
1290 {
1291         drm_file_t *priv = filp->private_data;
1292         drm_device_t *dev = priv->head->dev;
1293         drm_device_dma_t *dma = dev->dma;
1294         drm_buf_info_t request;
1295         drm_buf_info_t __user *argp = (void __user *)arg;
1296         int i;
1297         int count;
1298
1299         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1300                 return -EINVAL;
1301
1302         if (!dma)
1303                 return -EINVAL;
1304
1305         spin_lock(&dev->count_lock);
1306         if (atomic_read(&dev->buf_alloc)) {
1307                 spin_unlock(&dev->count_lock);
1308                 return -EBUSY;
1309         }
1310         ++dev->buf_use;         /* Can't allocate more after this call */
1311         spin_unlock(&dev->count_lock);
1312
1313         if (copy_from_user(&request, argp, sizeof(request)))
1314                 return -EFAULT;
1315
1316         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1317                 if (dma->bufs[i].buf_count)
1318                         ++count;
1319         }
1320
1321         DRM_DEBUG("count = %d\n", count);
1322
1323         if (request.count >= count) {
1324                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1325                         if (dma->bufs[i].buf_count) {
1326                                 drm_buf_desc_t __user *to =
1327                                     &request.list[count];
1328                                 drm_buf_entry_t *from = &dma->bufs[i];
1329                                 drm_freelist_t *list = &dma->bufs[i].freelist;
1330                                 if (copy_to_user(&to->count,
1331                                                  &from->buf_count,
1332                                                  sizeof(from->buf_count)) ||
1333                                     copy_to_user(&to->size,
1334                                                  &from->buf_size,
1335                                                  sizeof(from->buf_size)) ||
1336                                     copy_to_user(&to->low_mark,
1337                                                  &list->low_mark,
1338                                                  sizeof(list->low_mark)) ||
1339                                     copy_to_user(&to->high_mark,
1340                                                  &list->high_mark,
1341                                                  sizeof(list->high_mark)))
1342                                         return -EFAULT;
1343
1344                                 DRM_DEBUG("%d %d %d %d %d\n",
1345                                           i,
1346                                           dma->bufs[i].buf_count,
1347                                           dma->bufs[i].buf_size,
1348                                           dma->bufs[i].freelist.low_mark,
1349                                           dma->bufs[i].freelist.high_mark);
1350                                 ++count;
1351                         }
1352                 }
1353         }
1354         request.count = count;
1355
1356         if (copy_to_user(argp, &request, sizeof(request)))
1357                 return -EFAULT;
1358
1359         return 0;
1360 }
1361
1362 /**
1363  * Specifies a low and high water mark for buffer allocation
1364  *
1365  * \param inode device inode.
1366  * \param filp file pointer.
1367  * \param cmd command.
1368  * \param arg a pointer to a drm_buf_desc structure.
1369  * \return zero on success or a negative number on failure.
1370  *
1371  * Verifies that the size order is bounded between the admissible orders and
1372  * updates the respective drm_device_dma::bufs entry low and high water mark.
1373  *
1374  * \note This ioctl is deprecated and mostly never used.
1375  */
1376 int drm_markbufs(struct inode *inode, struct file *filp,
1377                  unsigned int cmd, unsigned long arg)
1378 {
1379         drm_file_t *priv = filp->private_data;
1380         drm_device_t *dev = priv->head->dev;
1381         drm_device_dma_t *dma = dev->dma;
1382         drm_buf_desc_t request;
1383         int order;
1384         drm_buf_entry_t *entry;
1385
1386         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1387                 return -EINVAL;
1388
1389         if (!dma)
1390                 return -EINVAL;
1391
1392         if (copy_from_user(&request,
1393                            (drm_buf_desc_t __user *) arg, sizeof(request)))
1394                 return -EFAULT;
1395
1396         DRM_DEBUG("%d, %d, %d\n",
1397                   request.size, request.low_mark, request.high_mark);
1398         order = drm_order(request.size);
1399         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1400                 return -EINVAL;
1401         entry = &dma->bufs[order];
1402
1403         if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1404                 return -EINVAL;
1405         if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1406                 return -EINVAL;
1407
1408         entry->freelist.low_mark = request.low_mark;
1409         entry->freelist.high_mark = request.high_mark;
1410
1411         return 0;
1412 }
1413
1414 /**
1415  * Unreserve the buffers in list, previously reserved using drmDMA.
1416  *
1417  * \param inode device inode.
1418  * \param filp file pointer.
1419  * \param cmd command.
1420  * \param arg pointer to a drm_buf_free structure.
1421  * \return zero on success or a negative number on failure.
1422  *
1423  * Calls free_buffer() for each used buffer.
1424  * This function is primarily used for debugging.
1425  */
1426 int drm_freebufs(struct inode *inode, struct file *filp,
1427                  unsigned int cmd, unsigned long arg)
1428 {
1429         drm_file_t *priv = filp->private_data;
1430         drm_device_t *dev = priv->head->dev;
1431         drm_device_dma_t *dma = dev->dma;
1432         drm_buf_free_t request;
1433         int i;
1434         int idx;
1435         drm_buf_t *buf;
1436
1437         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1438                 return -EINVAL;
1439
1440         if (!dma)
1441                 return -EINVAL;
1442
1443         if (copy_from_user(&request,
1444                            (drm_buf_free_t __user *) arg, sizeof(request)))
1445                 return -EFAULT;
1446
1447         DRM_DEBUG("%d\n", request.count);
1448         for (i = 0; i < request.count; i++) {
1449                 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1450                         return -EFAULT;
1451                 if (idx < 0 || idx >= dma->buf_count) {
1452                         DRM_ERROR("Index %d (of %d max)\n",
1453                                   idx, dma->buf_count - 1);
1454                         return -EINVAL;
1455                 }
1456                 buf = dma->buflist[idx];
1457                 if (buf->filp != filp) {
1458                         DRM_ERROR("Process %d freeing buffer not owned\n",
1459                                   current->pid);
1460                         return -EINVAL;
1461                 }
1462                 drm_free_buffer(dev, buf);
1463         }
1464
1465         return 0;
1466 }
1467
1468 /**
1469  * Maps all of the DMA buffers into client-virtual space (ioctl).
1470  *
1471  * \param inode device inode.
1472  * \param filp file pointer.
1473  * \param cmd command.
1474  * \param arg pointer to a drm_buf_map structure.
1475  * \return zero on success or a negative number on failure.
1476  *
1477  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1478  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1479  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1480  * drm_mmap_dma().
1481  */
1482 int drm_mapbufs(struct inode *inode, struct file *filp,
1483                 unsigned int cmd, unsigned long arg)
1484 {
1485         drm_file_t *priv = filp->private_data;
1486         drm_device_t *dev = priv->head->dev;
1487         drm_device_dma_t *dma = dev->dma;
1488         drm_buf_map_t __user *argp = (void __user *)arg;
1489         int retcode = 0;
1490         const int zero = 0;
1491         unsigned long virtual;
1492         unsigned long address;
1493         drm_buf_map_t request;
1494         int i;
1495
1496         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1497                 return -EINVAL;
1498
1499         if (!dma)
1500                 return -EINVAL;
1501
1502         spin_lock(&dev->count_lock);
1503         if (atomic_read(&dev->buf_alloc)) {
1504                 spin_unlock(&dev->count_lock);
1505                 return -EBUSY;
1506         }
1507         dev->buf_use++;         /* Can't allocate more after this call */
1508         spin_unlock(&dev->count_lock);
1509
1510         if (copy_from_user(&request, argp, sizeof(request)))
1511                 return -EFAULT;
1512
1513         if (request.count >= dma->buf_count) {
1514                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1515                     || (drm_core_check_feature(dev, DRIVER_SG)
1516                         && (dma->flags & _DRM_DMA_USE_SG))
1517                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1518                         && (dma->flags & _DRM_DMA_USE_FB))) {
1519                         drm_map_t *map = dev->agp_buffer_map;
1520                         unsigned long token = dev->agp_buffer_token;
1521
1522                         if (!map) {
1523                                 retcode = -EINVAL;
1524                                 goto done;
1525                         }
1526
1527                         down_write(&current->mm->mmap_sem);
1528                         virtual = do_mmap(filp, 0, map->size,
1529                                           PROT_READ | PROT_WRITE,
1530                                           MAP_SHARED, token);
1531                         up_write(&current->mm->mmap_sem);
1532                 } else {
1533                         down_write(&current->mm->mmap_sem);
1534                         virtual = do_mmap(filp, 0, dma->byte_count,
1535                                           PROT_READ | PROT_WRITE,
1536                                           MAP_SHARED, 0);
1537                         up_write(&current->mm->mmap_sem);
1538                 }
1539                 if (virtual > -1024UL) {
1540                         /* Real error */
1541                         retcode = (signed long)virtual;
1542                         goto done;
1543                 }
1544                 request.virtual = (void __user *)virtual;
1545
1546                 for (i = 0; i < dma->buf_count; i++) {
1547                         if (copy_to_user(&request.list[i].idx,
1548                                          &dma->buflist[i]->idx,
1549                                          sizeof(request.list[0].idx))) {
1550                                 retcode = -EFAULT;
1551                                 goto done;
1552                         }
1553                         if (copy_to_user(&request.list[i].total,
1554                                          &dma->buflist[i]->total,
1555                                          sizeof(request.list[0].total))) {
1556                                 retcode = -EFAULT;
1557                                 goto done;
1558                         }
1559                         if (copy_to_user(&request.list[i].used,
1560                                          &zero, sizeof(zero))) {
1561                                 retcode = -EFAULT;
1562                                 goto done;
1563                         }
1564                         address = virtual + dma->buflist[i]->offset;    /* *** */
1565                         if (copy_to_user(&request.list[i].address,
1566                                          &address, sizeof(address))) {
1567                                 retcode = -EFAULT;
1568                                 goto done;
1569                         }
1570                 }
1571         }
1572       done:
1573         request.count = dma->buf_count;
1574         DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1575
1576         if (copy_to_user(argp, &request, sizeof(request)))
1577                 return -EFAULT;
1578
1579         return retcode;
1580 }
1581
1582 /**
1583  * Compute size order.  Returns the exponent of the smaller power of two which
1584  * is greater or equal to given number.
1585  *
1586  * \param size size.
1587  * \return order.
1588  *
1589  * \todo Can be made faster.
1590  */
1591 int drm_order(unsigned long size)
1592 {
1593         int order;
1594         unsigned long tmp;
1595
1596         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1597
1598         if (size & (size - 1))
1599                 ++order;
1600
1601         return order;
1602 }
1603 EXPORT_SYMBOL(drm_order);
1604
1605