git.oblomov.eu Git - linux-2.6/blob - 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                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 241                 return -EINVAL;
 242         }
 243         memset(list, 0, sizeof(*list));
 244         list->map = map;
 245
 246         mutex_lock(&dev->struct_mutex);
 247         list_add(&list->head, &dev->maplist->head);
 248
 249         /* Assign a 32-bit handle */
 250         /* We do it here so that dev->struct_mutex protects the increment */
 251         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 252                 map->offset;
 253         ret = drm_map_handle(dev, &list->hash, user_token, 0);
 254         if (ret) {
 255                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 256                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 257                 mutex_unlock(&dev->struct_mutex);
 258                 return ret;
 259         }
 260
 261         list->user_token = list->hash.key;
 262         mutex_unlock(&dev->struct_mutex);
 263
 264         *maplist = list;
 265         return 0;
 266 }
 267
 268 int drm_addmap(drm_device_t * dev, unsigned int offset,
 269                unsigned int size, drm_map_type_t type,
 270                drm_map_flags_t flags, drm_local_map_t ** map_ptr)
 271 {
 272         drm_map_list_t *list;
 273         int rc;
 274
 275         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 276         if (!rc)
 277                 *map_ptr = list->map;
 278         return rc;
 279 }
 280
 281 EXPORT_SYMBOL(drm_addmap);
 282
 283 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
 284                      unsigned int cmd, unsigned long arg)
 285 {
 286         drm_file_t *priv = filp->private_data;
 287         drm_device_t *dev = priv->head->dev;
 288         drm_map_t map;
 289         drm_map_list_t *maplist;
 290         drm_map_t __user *argp = (void __user *)arg;
 291         int err;
 292
 293         if (!(filp->f_mode & 3))
 294                 return -EACCES; /* Require read/write */
 295
 296         if (copy_from_user(&map, argp, sizeof(map))) {
 297                 return -EFAULT;
 298         }
 299
 300         if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
 301                 return -EPERM;
 302
 303         err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
 304                               &maplist);
 305
 306         if (err)
 307                 return err;
 308
 309         if (copy_to_user(argp, maplist->map, sizeof(drm_map_t)))
 310                 return -EFAULT;
 311
 312         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 313         if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
 314                 return -EFAULT;
 315         return 0;
 316 }
 317
 318 /**
 319  * Remove a map private from list and deallocate resources if the mapping
 320  * isn't in use.
 321  *
 322  * \param inode device inode.
 323  * \param filp file pointer.
 324  * \param cmd command.
 325  * \param arg pointer to a drm_map_t structure.
 326  * \return zero on success or a negative value on error.
 327  *
 328  * Searches the map on drm_device::maplist, removes it from the list, see if
 329  * its being used, and free any associate resource (such as MTRR's) if it's not
 330  * being on use.
 331  *
 332  * \sa drm_addmap
 333  */
 334 int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
 335 {
 336         struct list_head *list;
 337         drm_map_list_t *r_list = NULL;
 338         drm_dma_handle_t dmah;
 339
 340         /* Find the list entry for the map and remove it */
 341         list_for_each(list, &dev->maplist->head) {
 342                 r_list = list_entry(list, drm_map_list_t, head);
 343
 344                 if (r_list->map == map) {
 345                         list_del(list);
 346                         drm_ht_remove_key(&dev->map_hash, r_list->user_token);
 347                         drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 348                         break;
 349                 }
 350         }
 351
 352         /* List has wrapped around to the head pointer, or it's empty and we
 353          * didn't find anything.
 354          */
 355         if (list == (&dev->maplist->head)) {
 356                 return -EINVAL;
 357         }
 358
 359         switch (map->type) {
 360         case _DRM_REGISTERS:
 361                 drm_ioremapfree(map->handle, map->size, dev);
 362                 /* FALLTHROUGH */
 363         case _DRM_FRAME_BUFFER:
 364                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 365                         int retcode;
 366                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 367                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 368                 }
 369                 break;
 370         case _DRM_SHM:
 371                 vfree(map->handle);
 372                 break;
 373         case _DRM_AGP:
 374         case _DRM_SCATTER_GATHER:
 375                 break;
 376         case _DRM_CONSISTENT:
 377                 dmah.vaddr = map->handle;
 378                 dmah.busaddr = map->offset;
 379                 dmah.size = map->size;
 380                 __drm_pci_free(dev, &dmah);
 381                 break;
 382         }
 383         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 384
 385         return 0;
 386 }
 387
 388 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
 389 {
 390         int ret;
 391
 392         mutex_lock(&dev->struct_mutex);
 393         ret = drm_rmmap_locked(dev, map);
 394         mutex_unlock(&dev->struct_mutex);
 395
 396         return ret;
 397 }
 398
 399 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 400  * the last close of the device, and this is necessary for cleanup when things
 401  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 402  * like a pointless exercise since they're going away anyway.
 403  *
 404  * One use case might be after addmap is allowed for normal users for SHM and
 405  * gets used by drivers that the server doesn't need to care about.  This seems
 406  * unlikely.
 407  */
 408 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 409                     unsigned int cmd, unsigned long arg)
 410 {
 411         drm_file_t *priv = filp->private_data;
 412         drm_device_t *dev = priv->head->dev;
 413         drm_map_t request;
 414         drm_local_map_t *map = NULL;
 415         struct list_head *list;
 416         int ret;
 417
 418         if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
 419                 return -EFAULT;
 420         }
 421
 422         mutex_lock(&dev->struct_mutex);
 423         list_for_each(list, &dev->maplist->head) {
 424                 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 425
 426                 if (r_list->map &&
 427                     r_list->user_token == (unsigned long)request.handle &&
 428                     r_list->map->flags & _DRM_REMOVABLE) {
 429                         map = r_list->map;
 430                         break;
 431                 }
 432         }
 433
 434         /* List has wrapped around to the head pointer, or its empty we didn't
 435          * find anything.
 436          */
 437         if (list == (&dev->maplist->head)) {
 438                 mutex_unlock(&dev->struct_mutex);
 439                 return -EINVAL;
 440         }
 441
 442         if (!map) {
 443                 mutex_unlock(&dev->struct_mutex);
 444                 return -EINVAL;
 445         }
 446
 447         /* Register and framebuffer maps are permanent */
 448         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 449                 mutex_unlock(&dev->struct_mutex);
 450                 return 0;
 451         }
 452
 453         ret = drm_rmmap_locked(dev, map);
 454
 455         mutex_unlock(&dev->struct_mutex);
 456
 457         return ret;
 458 }
 459
 460 /**
 461  * Cleanup after an error on one of the addbufs() functions.
 462  *
 463  * \param dev DRM device.
 464  * \param entry buffer entry where the error occurred.
 465  *
 466  * Frees any pages and buffers associated with the given entry.
 467  */
 468 static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
 469 {
 470         int i;
 471
 472         if (entry->seg_count) {
 473                 for (i = 0; i < entry->seg_count; i++) {
 474                         if (entry->seglist[i]) {
 475                                 drm_pci_free(dev, entry->seglist[i]);
 476                         }
 477                 }
 478                 drm_free(entry->seglist,
 479                          entry->seg_count *
 480                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 481
 482                 entry->seg_count = 0;
 483         }
 484
 485         if (entry->buf_count) {
 486                 for (i = 0; i < entry->buf_count; i++) {
 487                         if (entry->buflist[i].dev_private) {
 488                                 drm_free(entry->buflist[i].dev_private,
 489                                          entry->buflist[i].dev_priv_size,
 490                                          DRM_MEM_BUFS);
 491                         }
 492                 }
 493                 drm_free(entry->buflist,
 494                          entry->buf_count *
 495                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 496
 497                 entry->buf_count = 0;
 498         }
 499 }
 500
 501 #if __OS_HAS_AGP
 502 /**
 503  * Add AGP buffers for DMA transfers.
 504  *
 505  * \param dev drm_device_t to which the buffers are to be added.
 506  * \param request pointer to a drm_buf_desc_t describing the request.
 507  * \return zero on success or a negative number on failure.
 508  *
 509  * After some sanity checks creates a drm_buf structure for each buffer and
 510  * reallocates the buffer list of the same size order to accommodate the new
 511  * buffers.
 512  */
 513 int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
 514 {
 515         drm_device_dma_t *dma = dev->dma;
 516         drm_buf_entry_t *entry;
 517         drm_buf_t *buf;
 518         unsigned long offset;
 519         unsigned long agp_offset;
 520         int count;
 521         int order;
 522         int size;
 523         int alignment;
 524         int page_order;
 525         int total;
 526         int byte_count;
 527         int i;
 528         drm_buf_t **temp_buflist;
 529
 530         if (!dma)
 531                 return -EINVAL;
 532
 533         count = request->count;
 534         order = drm_order(request->size);
 535         size = 1 << order;
 536
 537         alignment = (request->flags & _DRM_PAGE_ALIGN)
 538             ? PAGE_ALIGN(size) : size;
 539         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 540         total = PAGE_SIZE << page_order;
 541
 542         byte_count = 0;
 543         agp_offset = dev->agp->base + request->agp_start;
 544
 545         DRM_DEBUG("count:      %d\n", count);
 546         DRM_DEBUG("order:      %d\n", order);
 547         DRM_DEBUG("size:       %d\n", size);
 548         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 549         DRM_DEBUG("alignment:  %d\n", alignment);
 550         DRM_DEBUG("page_order: %d\n", page_order);
 551         DRM_DEBUG("total:      %d\n", total);
 552
 553         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 554                 return -EINVAL;
 555         if (dev->queue_count)
 556                 return -EBUSY;  /* Not while in use */
 557
 558         spin_lock(&dev->count_lock);
 559         if (dev->buf_use) {
 560                 spin_unlock(&dev->count_lock);
 561                 return -EBUSY;
 562         }
 563         atomic_inc(&dev->buf_alloc);
 564         spin_unlock(&dev->count_lock);
 565
 566         mutex_lock(&dev->struct_mutex);
 567         entry = &dma->bufs[order];
 568         if (entry->buf_count) {
 569                 mutex_unlock(&dev->struct_mutex);
 570                 atomic_dec(&dev->buf_alloc);
 571                 return -ENOMEM; /* May only call once for each order */
 572         }
 573
 574         if (count < 0 || count > 4096) {
 575                 mutex_unlock(&dev->struct_mutex);
 576                 atomic_dec(&dev->buf_alloc);
 577                 return -EINVAL;
 578         }
 579
 580         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 581                                    DRM_MEM_BUFS);
 582         if (!entry->buflist) {
 583                 mutex_unlock(&dev->struct_mutex);
 584                 atomic_dec(&dev->buf_alloc);
 585                 return -ENOMEM;
 586         }
 587         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 588
 589         entry->buf_size = size;
 590         entry->page_order = page_order;
 591
 592         offset = 0;
 593
 594         while (entry->buf_count < count) {
 595                 buf = &entry->buflist[entry->buf_count];
 596                 buf->idx = dma->buf_count + entry->buf_count;
 597                 buf->total = alignment;
 598                 buf->order = order;
 599                 buf->used = 0;
 600
 601                 buf->offset = (dma->byte_count + offset);
 602                 buf->bus_address = agp_offset + offset;
 603                 buf->address = (void *)(agp_offset + offset);
 604                 buf->next = NULL;
 605                 buf->waiting = 0;
 606                 buf->pending = 0;
 607                 init_waitqueue_head(&buf->dma_wait);
 608                 buf->filp = NULL;
 609
 610                 buf->dev_priv_size = dev->driver->dev_priv_size;
 611                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 612                 if (!buf->dev_private) {
 613                         /* Set count correctly so we free the proper amount. */
 614                         entry->buf_count = count;
 615                         drm_cleanup_buf_error(dev, entry);
 616                         mutex_unlock(&dev->struct_mutex);
 617                         atomic_dec(&dev->buf_alloc);
 618                         return -ENOMEM;
 619                 }
 620                 memset(buf->dev_private, 0, buf->dev_priv_size);
 621
 622                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 623
 624                 offset += alignment;
 625                 entry->buf_count++;
 626                 byte_count += PAGE_SIZE << page_order;
 627         }
 628
 629         DRM_DEBUG("byte_count: %d\n", byte_count);
 630
 631         temp_buflist = drm_realloc(dma->buflist,
 632                                    dma->buf_count * sizeof(*dma->buflist),
 633                                    (dma->buf_count + entry->buf_count)
 634                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 635         if (!temp_buflist) {
 636                 /* Free the entry because it isn't valid */
 637                 drm_cleanup_buf_error(dev, entry);
 638                 mutex_unlock(&dev->struct_mutex);
 639                 atomic_dec(&dev->buf_alloc);
 640                 return -ENOMEM;
 641         }
 642         dma->buflist = temp_buflist;
 643
 644         for (i = 0; i < entry->buf_count; i++) {
 645                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 646         }
 647
 648         dma->buf_count += entry->buf_count;
 649         dma->seg_count += entry->seg_count;
 650         dma->page_count += byte_count >> PAGE_SHIFT;
 651         dma->byte_count += byte_count;
 652
 653         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 654         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 655
 656         mutex_unlock(&dev->struct_mutex);
 657
 658         request->count = entry->buf_count;
 659         request->size = size;
 660
 661         dma->flags = _DRM_DMA_USE_AGP;
 662
 663         atomic_dec(&dev->buf_alloc);
 664         return 0;
 665 }
 666 EXPORT_SYMBOL(drm_addbufs_agp);
 667 #endif                          /* __OS_HAS_AGP */
 668
 669 int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
 670 {
 671         drm_device_dma_t *dma = dev->dma;
 672         int count;
 673         int order;
 674         int size;
 675         int total;
 676         int page_order;
 677         drm_buf_entry_t *entry;
 678         drm_dma_handle_t *dmah;
 679         drm_buf_t *buf;
 680         int alignment;
 681         unsigned long offset;
 682         int i;
 683         int byte_count;
 684         int page_count;
 685         unsigned long *temp_pagelist;
 686         drm_buf_t **temp_buflist;
 687
 688         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 689                 return -EINVAL;
 690
 691         if (!dma)
 692                 return -EINVAL;
 693
 694         if (!capable(CAP_SYS_ADMIN))
 695                 return -EPERM;
 696
 697         count = request->count;
 698         order = drm_order(request->size);
 699         size = 1 << order;
 700
 701         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 702                   request->count, request->size, size, order, dev->queue_count);
 703
 704         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 705                 return -EINVAL;
 706         if (dev->queue_count)
 707                 return -EBUSY;  /* Not while in use */
 708
 709         alignment = (request->flags & _DRM_PAGE_ALIGN)
 710             ? PAGE_ALIGN(size) : size;
 711         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 712         total = PAGE_SIZE << page_order;
 713
 714         spin_lock(&dev->count_lock);
 715         if (dev->buf_use) {
 716                 spin_unlock(&dev->count_lock);
 717                 return -EBUSY;
 718         }
 719         atomic_inc(&dev->buf_alloc);
 720         spin_unlock(&dev->count_lock);
 721
 722         mutex_lock(&dev->struct_mutex);
 723         entry = &dma->bufs[order];
 724         if (entry->buf_count) {
 725                 mutex_unlock(&dev->struct_mutex);
 726                 atomic_dec(&dev->buf_alloc);
 727                 return -ENOMEM; /* May only call once for each order */
 728         }
 729
 730         if (count < 0 || count > 4096) {
 731                 mutex_unlock(&dev->struct_mutex);
 732                 atomic_dec(&dev->buf_alloc);
 733                 return -EINVAL;
 734         }
 735
 736         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 737                                    DRM_MEM_BUFS);
 738         if (!entry->buflist) {
 739                 mutex_unlock(&dev->struct_mutex);
 740                 atomic_dec(&dev->buf_alloc);
 741                 return -ENOMEM;
 742         }
 743         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 744
 745         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 746                                    DRM_MEM_SEGS);
 747         if (!entry->seglist) {
 748                 drm_free(entry->buflist,
 749                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 750                 mutex_unlock(&dev->struct_mutex);
 751                 atomic_dec(&dev->buf_alloc);
 752                 return -ENOMEM;
 753         }
 754         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 755
 756         /* Keep the original pagelist until we know all the allocations
 757          * have succeeded
 758          */
 759         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 760                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 761         if (!temp_pagelist) {
 762                 drm_free(entry->buflist,
 763                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 764                 drm_free(entry->seglist,
 765                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 766                 mutex_unlock(&dev->struct_mutex);
 767                 atomic_dec(&dev->buf_alloc);
 768                 return -ENOMEM;
 769         }
 770         memcpy(temp_pagelist,
 771                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 772         DRM_DEBUG("pagelist: %d entries\n",
 773                   dma->page_count + (count << page_order));
 774
 775         entry->buf_size = size;
 776         entry->page_order = page_order;
 777         byte_count = 0;
 778         page_count = 0;
 779
 780         while (entry->buf_count < count) {
 781
 782                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 783
 784                 if (!dmah) {
 785                         /* Set count correctly so we free the proper amount. */
 786                         entry->buf_count = count;
 787                         entry->seg_count = count;
 788                         drm_cleanup_buf_error(dev, entry);
 789                         drm_free(temp_pagelist,
 790                                  (dma->page_count + (count << page_order))
 791                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 792                         mutex_unlock(&dev->struct_mutex);
 793                         atomic_dec(&dev->buf_alloc);
 794                         return -ENOMEM;
 795                 }
 796                 entry->seglist[entry->seg_count++] = dmah;
 797                 for (i = 0; i < (1 << page_order); i++) {
 798                         DRM_DEBUG("page %d @ 0x%08lx\n",
 799                                   dma->page_count + page_count,
 800                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 801                         temp_pagelist[dma->page_count + page_count++]
 802                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 803                 }
 804                 for (offset = 0;
 805                      offset + size <= total && entry->buf_count < count;
 806                      offset += alignment, ++entry->buf_count) {
 807                         buf = &entry->buflist[entry->buf_count];
 808                         buf->idx = dma->buf_count + entry->buf_count;
 809                         buf->total = alignment;
 810                         buf->order = order;
 811                         buf->used = 0;
 812                         buf->offset = (dma->byte_count + byte_count + offset);
 813                         buf->address = (void *)(dmah->vaddr + offset);
 814                         buf->bus_address = dmah->busaddr + offset;
 815                         buf->next = NULL;
 816                         buf->waiting = 0;
 817                         buf->pending = 0;
 818                         init_waitqueue_head(&buf->dma_wait);
 819                         buf->filp = NULL;
 820
 821                         buf->dev_priv_size = dev->driver->dev_priv_size;
 822                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 823                                                      DRM_MEM_BUFS);
 824                         if (!buf->dev_private) {
 825                                 /* Set count correctly so we free the proper amount. */
 826                                 entry->buf_count = count;
 827                                 entry->seg_count = count;
 828                                 drm_cleanup_buf_error(dev, entry);
 829                                 drm_free(temp_pagelist,
 830                                          (dma->page_count +
 831                                           (count << page_order))
 832                                          * sizeof(*dma->pagelist),
 833                                          DRM_MEM_PAGES);
 834                                 mutex_unlock(&dev->struct_mutex);
 835                                 atomic_dec(&dev->buf_alloc);
 836                                 return -ENOMEM;
 837                         }
 838                         memset(buf->dev_private, 0, buf->dev_priv_size);
 839
 840                         DRM_DEBUG("buffer %d @ %p\n",
 841                                   entry->buf_count, buf->address);
 842                 }
 843                 byte_count += PAGE_SIZE << page_order;
 844         }
 845
 846         temp_buflist = drm_realloc(dma->buflist,
 847                                    dma->buf_count * sizeof(*dma->buflist),
 848                                    (dma->buf_count + entry->buf_count)
 849                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 850         if (!temp_buflist) {
 851                 /* Free the entry because it isn't valid */
 852                 drm_cleanup_buf_error(dev, entry);
 853                 drm_free(temp_pagelist,
 854                          (dma->page_count + (count << page_order))
 855                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 856                 mutex_unlock(&dev->struct_mutex);
 857                 atomic_dec(&dev->buf_alloc);
 858                 return -ENOMEM;
 859         }
 860         dma->buflist = temp_buflist;
 861
 862         for (i = 0; i < entry->buf_count; i++) {
 863                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 864         }
 865
 866         /* No allocations failed, so now we can replace the orginal pagelist
 867          * with the new one.
 868          */
 869         if (dma->page_count) {
 870                 drm_free(dma->pagelist,
 871                          dma->page_count * sizeof(*dma->pagelist),
 872                          DRM_MEM_PAGES);
 873         }
 874         dma->pagelist = temp_pagelist;
 875
 876         dma->buf_count += entry->buf_count;
 877         dma->seg_count += entry->seg_count;
 878         dma->page_count += entry->seg_count << page_order;
 879         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 880
 881         mutex_unlock(&dev->struct_mutex);
 882
 883         request->count = entry->buf_count;
 884         request->size = size;
 885
 886         atomic_dec(&dev->buf_alloc);
 887         return 0;
 888
 889 }
 890 EXPORT_SYMBOL(drm_addbufs_pci);
 891
 892 static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
 893 {
 894         drm_device_dma_t *dma = dev->dma;
 895         drm_buf_entry_t *entry;
 896         drm_buf_t *buf;
 897         unsigned long offset;
 898         unsigned long agp_offset;
 899         int count;
 900         int order;
 901         int size;
 902         int alignment;
 903         int page_order;
 904         int total;
 905         int byte_count;
 906         int i;
 907         drm_buf_t **temp_buflist;
 908
 909         if (!drm_core_check_feature(dev, DRIVER_SG))
 910                 return -EINVAL;
 911
 912         if (!dma)
 913                 return -EINVAL;
 914
 915         if (!capable(CAP_SYS_ADMIN))
 916                 return -EPERM;
 917
 918         count = request->count;
 919         order = drm_order(request->size);
 920         size = 1 << order;
 921
 922         alignment = (request->flags & _DRM_PAGE_ALIGN)
 923             ? PAGE_ALIGN(size) : size;
 924         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 925         total = PAGE_SIZE << page_order;
 926
 927         byte_count = 0;
 928         agp_offset = request->agp_start;
 929
 930         DRM_DEBUG("count:      %d\n", count);
 931         DRM_DEBUG("order:      %d\n", order);
 932         DRM_DEBUG("size:       %d\n", size);
 933         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 934         DRM_DEBUG("alignment:  %d\n", alignment);
 935         DRM_DEBUG("page_order: %d\n", page_order);
 936         DRM_DEBUG("total:      %d\n", total);
 937
 938         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 939                 return -EINVAL;
 940         if (dev->queue_count)
 941                 return -EBUSY;  /* Not while in use */
 942
 943         spin_lock(&dev->count_lock);
 944         if (dev->buf_use) {
 945                 spin_unlock(&dev->count_lock);
 946                 return -EBUSY;
 947         }
 948         atomic_inc(&dev->buf_alloc);
 949         spin_unlock(&dev->count_lock);
 950
 951         mutex_lock(&dev->struct_mutex);
 952         entry = &dma->bufs[order];
 953         if (entry->buf_count) {
 954                 mutex_unlock(&dev->struct_mutex);
 955                 atomic_dec(&dev->buf_alloc);
 956                 return -ENOMEM; /* May only call once for each order */
 957         }
 958
 959         if (count < 0 || count > 4096) {
 960                 mutex_unlock(&dev->struct_mutex);
 961                 atomic_dec(&dev->buf_alloc);
 962                 return -EINVAL;
 963         }
 964
 965         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 966                                    DRM_MEM_BUFS);
 967         if (!entry->buflist) {
 968                 mutex_unlock(&dev->struct_mutex);
 969                 atomic_dec(&dev->buf_alloc);
 970                 return -ENOMEM;
 971         }
 972         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 973
 974         entry->buf_size = size;
 975         entry->page_order = page_order;
 976
 977         offset = 0;
 978
 979         while (entry->buf_count < count) {
 980                 buf = &entry->buflist[entry->buf_count];
 981                 buf->idx = dma->buf_count + entry->buf_count;
 982                 buf->total = alignment;
 983                 buf->order = order;
 984                 buf->used = 0;
 985
 986                 buf->offset = (dma->byte_count + offset);
 987                 buf->bus_address = agp_offset + offset;
 988                 buf->address = (void *)(agp_offset + offset
 989                                         + (unsigned long)dev->sg->virtual);
 990                 buf->next = NULL;
 991                 buf->waiting = 0;
 992                 buf->pending = 0;
 993                 init_waitqueue_head(&buf->dma_wait);
 994                 buf->filp = NULL;
 995
 996                 buf->dev_priv_size = dev->driver->dev_priv_size;
 997                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 998                 if (!buf->dev_private) {
 999                         /* Set count correctly so we free the proper amount. */
1000                         entry->buf_count = count;
1001                         drm_cleanup_buf_error(dev, entry);
1002                         mutex_unlock(&dev->struct_mutex);
1003                         atomic_dec(&dev->buf_alloc);
1004                         return -ENOMEM;
1005                 }
1006
1007                 memset(buf->dev_private, 0, buf->dev_priv_size);
1008
1009                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1010
1011                 offset += alignment;
1012                 entry->buf_count++;
1013                 byte_count += PAGE_SIZE << page_order;
1014         }
1015
1016         DRM_DEBUG("byte_count: %d\n", byte_count);
1017
1018         temp_buflist = drm_realloc(dma->buflist,
1019                                    dma->buf_count * sizeof(*dma->buflist),
1020                                    (dma->buf_count + entry->buf_count)
1021                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1022         if (!temp_buflist) {
1023                 /* Free the entry because it isn't valid */
1024                 drm_cleanup_buf_error(dev, entry);
1025                 mutex_unlock(&dev->struct_mutex);
1026                 atomic_dec(&dev->buf_alloc);
1027                 return -ENOMEM;
1028         }
1029         dma->buflist = temp_buflist;
1030
1031         for (i = 0; i < entry->buf_count; i++) {
1032                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1033         }
1034
1035         dma->buf_count += entry->buf_count;
1036         dma->seg_count += entry->seg_count;
1037         dma->page_count += byte_count >> PAGE_SHIFT;
1038         dma->byte_count += byte_count;
1039
1040         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1041         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1042
1043         mutex_unlock(&dev->struct_mutex);
1044
1045         request->count = entry->buf_count;
1046         request->size = size;
1047
1048         dma->flags = _DRM_DMA_USE_SG;
1049
1050         atomic_dec(&dev->buf_alloc);
1051         return 0;
1052 }
1053
1054 static int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
1055 {
1056         drm_device_dma_t *dma = dev->dma;
1057         drm_buf_entry_t *entry;
1058         drm_buf_t *buf;
1059         unsigned long offset;
1060         unsigned long agp_offset;
1061         int count;
1062         int order;
1063         int size;
1064         int alignment;
1065         int page_order;
1066         int total;
1067         int byte_count;
1068         int i;
1069         drm_buf_t **temp_buflist;
1070
1071         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1072                 return -EINVAL;
1073
1074         if (!dma)
1075                 return -EINVAL;
1076
1077         if (!capable(CAP_SYS_ADMIN))
1078                 return -EPERM;
1079
1080         count = request->count;
1081         order = drm_order(request->size);
1082         size = 1 << order;
1083
1084         alignment = (request->flags & _DRM_PAGE_ALIGN)
1085             ? PAGE_ALIGN(size) : size;
1086         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1087         total = PAGE_SIZE << page_order;
1088
1089         byte_count = 0;
1090         agp_offset = request->agp_start;
1091
1092         DRM_DEBUG("count:      %d\n", count);
1093         DRM_DEBUG("order:      %d\n", order);
1094         DRM_DEBUG("size:       %d\n", size);
1095         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1096         DRM_DEBUG("alignment:  %d\n", alignment);
1097         DRM_DEBUG("page_order: %d\n", page_order);
1098         DRM_DEBUG("total:      %d\n", total);
1099
1100         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1101                 return -EINVAL;
1102         if (dev->queue_count)
1103                 return -EBUSY;  /* Not while in use */
1104
1105         spin_lock(&dev->count_lock);
1106         if (dev->buf_use) {
1107                 spin_unlock(&dev->count_lock);
1108                 return -EBUSY;
1109         }
1110         atomic_inc(&dev->buf_alloc);
1111         spin_unlock(&dev->count_lock);
1112
1113         mutex_lock(&dev->struct_mutex);
1114         entry = &dma->bufs[order];
1115         if (entry->buf_count) {
1116                 mutex_unlock(&dev->struct_mutex);
1117                 atomic_dec(&dev->buf_alloc);
1118                 return -ENOMEM; /* May only call once for each order */
1119         }
1120
1121         if (count < 0 || count > 4096) {
1122                 mutex_unlock(&dev->struct_mutex);
1123                 atomic_dec(&dev->buf_alloc);
1124                 return -EINVAL;
1125         }
1126
1127         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1128                                    DRM_MEM_BUFS);
1129         if (!entry->buflist) {
1130                 mutex_unlock(&dev->struct_mutex);
1131                 atomic_dec(&dev->buf_alloc);
1132                 return -ENOMEM;
1133         }
1134         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1135
1136         entry->buf_size = size;
1137         entry->page_order = page_order;
1138
1139         offset = 0;
1140
1141         while (entry->buf_count < count) {
1142                 buf = &entry->buflist[entry->buf_count];
1143                 buf->idx = dma->buf_count + entry->buf_count;
1144                 buf->total = alignment;
1145                 buf->order = order;
1146                 buf->used = 0;
1147
1148                 buf->offset = (dma->byte_count + offset);
1149                 buf->bus_address = agp_offset + offset;
1150                 buf->address = (void *)(agp_offset + offset);
1151                 buf->next = NULL;
1152                 buf->waiting = 0;
1153                 buf->pending = 0;
1154                 init_waitqueue_head(&buf->dma_wait);
1155                 buf->filp = NULL;
1156
1157                 buf->dev_priv_size = dev->driver->dev_priv_size;
1158                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1159                 if (!buf->dev_private) {
1160                         /* Set count correctly so we free the proper amount. */
1161                         entry->buf_count = count;
1162                         drm_cleanup_buf_error(dev, entry);
1163                         mutex_unlock(&dev->struct_mutex);
1164                         atomic_dec(&dev->buf_alloc);
1165                         return -ENOMEM;
1166                 }
1167                 memset(buf->dev_private, 0, buf->dev_priv_size);
1168
1169                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1170
1171                 offset += alignment;
1172                 entry->buf_count++;
1173                 byte_count += PAGE_SIZE << page_order;
1174         }
1175
1176         DRM_DEBUG("byte_count: %d\n", byte_count);
1177
1178         temp_buflist = drm_realloc(dma->buflist,
1179                                    dma->buf_count * sizeof(*dma->buflist),
1180                                    (dma->buf_count + entry->buf_count)
1181                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1182         if (!temp_buflist) {
1183                 /* Free the entry because it isn't valid */
1184                 drm_cleanup_buf_error(dev, entry);
1185                 mutex_unlock(&dev->struct_mutex);
1186                 atomic_dec(&dev->buf_alloc);
1187                 return -ENOMEM;
1188         }
1189         dma->buflist = temp_buflist;
1190
1191         for (i = 0; i < entry->buf_count; i++) {
1192                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1193         }
1194
1195         dma->buf_count += entry->buf_count;
1196         dma->seg_count += entry->seg_count;
1197         dma->page_count += byte_count >> PAGE_SHIFT;
1198         dma->byte_count += byte_count;
1199
1200         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1201         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1202
1203         mutex_unlock(&dev->struct_mutex);
1204
1205         request->count = entry->buf_count;
1206         request->size = size;
1207
1208         dma->flags = _DRM_DMA_USE_FB;
1209
1210         atomic_dec(&dev->buf_alloc);
1211         return 0;
1212 }
1213
1214
1215 /**
1216  * Add buffers for DMA transfers (ioctl).
1217  *
1218  * \param inode device inode.
1219  * \param filp file pointer.
1220  * \param cmd command.
1221  * \param arg pointer to a drm_buf_desc_t request.
1222  * \return zero on success or a negative number on failure.
1223  *
1224  * According with the memory type specified in drm_buf_desc::flags and the
1225  * build options, it dispatches the call either to addbufs_agp(),
1226  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1227  * PCI memory respectively.
1228  */
1229 int drm_addbufs(struct inode *inode, struct file *filp,
1230                 unsigned int cmd, unsigned long arg)
1231 {
1232         drm_buf_desc_t request;
1233         drm_file_t *priv = filp->private_data;
1234         drm_device_t *dev = priv->head->dev;
1235         int ret;
1236
1237         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1238                 return -EINVAL;
1239
1240         if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
1241                            sizeof(request)))
1242                 return -EFAULT;
1243
1244 #if __OS_HAS_AGP
1245         if (request.flags & _DRM_AGP_BUFFER)
1246                 ret = drm_addbufs_agp(dev, &request);
1247         else
1248 #endif
1249         if (request.flags & _DRM_SG_BUFFER)
1250                 ret = drm_addbufs_sg(dev, &request);
1251         else if (request.flags & _DRM_FB_BUFFER)
1252                 ret = drm_addbufs_fb(dev, &request);
1253         else
1254                 ret = drm_addbufs_pci(dev, &request);
1255
1256         if (ret == 0) {
1257                 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1258                         ret = -EFAULT;
1259                 }
1260         }
1261         return ret;
1262 }
1263
1264 /**
1265  * Get information about the buffer mappings.
1266  *
1267  * This was originally mean for debugging purposes, or by a sophisticated
1268  * client library to determine how best to use the available buffers (e.g.,
1269  * large buffers can be used for image transfer).
1270  *
1271  * \param inode device inode.
1272  * \param filp file pointer.
1273  * \param cmd command.
1274  * \param arg pointer to a drm_buf_info structure.
1275  * \return zero on success or a negative number on failure.
1276  *
1277  * Increments drm_device::buf_use while holding the drm_device::count_lock
1278  * lock, preventing of allocating more buffers after this call. Information
1279  * about each requested buffer is then copied into user space.
1280  */
1281 int drm_infobufs(struct inode *inode, struct file *filp,
1282                  unsigned int cmd, unsigned long arg)
1283 {
1284         drm_file_t *priv = filp->private_data;
1285         drm_device_t *dev = priv->head->dev;
1286         drm_device_dma_t *dma = dev->dma;
1287         drm_buf_info_t request;
1288         drm_buf_info_t __user *argp = (void __user *)arg;
1289         int i;
1290         int count;
1291
1292         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1293                 return -EINVAL;
1294
1295         if (!dma)
1296                 return -EINVAL;
1297
1298         spin_lock(&dev->count_lock);
1299         if (atomic_read(&dev->buf_alloc)) {
1300                 spin_unlock(&dev->count_lock);
1301                 return -EBUSY;
1302         }
1303         ++dev->buf_use;         /* Can't allocate more after this call */
1304         spin_unlock(&dev->count_lock);
1305
1306         if (copy_from_user(&request, argp, sizeof(request)))
1307                 return -EFAULT;
1308
1309         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1310                 if (dma->bufs[i].buf_count)
1311                         ++count;
1312         }
1313
1314         DRM_DEBUG("count = %d\n", count);
1315
1316         if (request.count >= count) {
1317                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1318                         if (dma->bufs[i].buf_count) {
1319                                 drm_buf_desc_t __user *to =
1320                                     &request.list[count];
1321                                 drm_buf_entry_t *from = &dma->bufs[i];
1322                                 drm_freelist_t *list = &dma->bufs[i].freelist;
1323                                 if (copy_to_user(&to->count,
1324                                                  &from->buf_count,
1325                                                  sizeof(from->buf_count)) ||
1326                                     copy_to_user(&to->size,
1327                                                  &from->buf_size,
1328                                                  sizeof(from->buf_size)) ||
1329                                     copy_to_user(&to->low_mark,
1330                                                  &list->low_mark,
1331                                                  sizeof(list->low_mark)) ||
1332                                     copy_to_user(&to->high_mark,
1333                                                  &list->high_mark,
1334                                                  sizeof(list->high_mark)))
1335                                         return -EFAULT;
1336
1337                                 DRM_DEBUG("%d %d %d %d %d\n",
1338                                           i,
1339                                           dma->bufs[i].buf_count,
1340                                           dma->bufs[i].buf_size,
1341                                           dma->bufs[i].freelist.low_mark,
1342                                           dma->bufs[i].freelist.high_mark);
1343                                 ++count;
1344                         }
1345                 }
1346         }
1347         request.count = count;
1348
1349         if (copy_to_user(argp, &request, sizeof(request)))
1350                 return -EFAULT;
1351
1352         return 0;
1353 }
1354
1355 /**
1356  * Specifies a low and high water mark for buffer allocation
1357  *
1358  * \param inode device inode.
1359  * \param filp file pointer.
1360  * \param cmd command.
1361  * \param arg a pointer to a drm_buf_desc structure.
1362  * \return zero on success or a negative number on failure.
1363  *
1364  * Verifies that the size order is bounded between the admissible orders and
1365  * updates the respective drm_device_dma::bufs entry low and high water mark.
1366  *
1367  * \note This ioctl is deprecated and mostly never used.
1368  */
1369 int drm_markbufs(struct inode *inode, struct file *filp,
1370                  unsigned int cmd, unsigned long arg)
1371 {
1372         drm_file_t *priv = filp->private_data;
1373         drm_device_t *dev = priv->head->dev;
1374         drm_device_dma_t *dma = dev->dma;
1375         drm_buf_desc_t request;
1376         int order;
1377         drm_buf_entry_t *entry;
1378
1379         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1380                 return -EINVAL;
1381
1382         if (!dma)
1383                 return -EINVAL;
1384
1385         if (copy_from_user(&request,
1386                            (drm_buf_desc_t __user *) arg, sizeof(request)))
1387                 return -EFAULT;
1388
1389         DRM_DEBUG("%d, %d, %d\n",
1390                   request.size, request.low_mark, request.high_mark);
1391         order = drm_order(request.size);
1392         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1393                 return -EINVAL;
1394         entry = &dma->bufs[order];
1395
1396         if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1397                 return -EINVAL;
1398         if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1399                 return -EINVAL;
1400
1401         entry->freelist.low_mark = request.low_mark;
1402         entry->freelist.high_mark = request.high_mark;
1403
1404         return 0;
1405 }
1406
1407 /**
1408  * Unreserve the buffers in list, previously reserved using drmDMA.
1409  *
1410  * \param inode device inode.
1411  * \param filp file pointer.
1412  * \param cmd command.
1413  * \param arg pointer to a drm_buf_free structure.
1414  * \return zero on success or a negative number on failure.
1415  *
1416  * Calls free_buffer() for each used buffer.
1417  * This function is primarily used for debugging.
1418  */
1419 int drm_freebufs(struct inode *inode, struct file *filp,
1420                  unsigned int cmd, unsigned long arg)
1421 {
1422         drm_file_t *priv = filp->private_data;
1423         drm_device_t *dev = priv->head->dev;
1424         drm_device_dma_t *dma = dev->dma;
1425         drm_buf_free_t request;
1426         int i;
1427         int idx;
1428         drm_buf_t *buf;
1429
1430         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1431                 return -EINVAL;
1432
1433         if (!dma)
1434                 return -EINVAL;
1435
1436         if (copy_from_user(&request,
1437                            (drm_buf_free_t __user *) arg, sizeof(request)))
1438                 return -EFAULT;
1439
1440         DRM_DEBUG("%d\n", request.count);
1441         for (i = 0; i < request.count; i++) {
1442                 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1443                         return -EFAULT;
1444                 if (idx < 0 || idx >= dma->buf_count) {
1445                         DRM_ERROR("Index %d (of %d max)\n",
1446                                   idx, dma->buf_count - 1);
1447                         return -EINVAL;
1448                 }
1449                 buf = dma->buflist[idx];
1450                 if (buf->filp != filp) {
1451                         DRM_ERROR("Process %d freeing buffer not owned\n",
1452                                   current->pid);
1453                         return -EINVAL;
1454                 }
1455                 drm_free_buffer(dev, buf);
1456         }
1457
1458         return 0;
1459 }
1460
1461 /**
1462  * Maps all of the DMA buffers into client-virtual space (ioctl).
1463  *
1464  * \param inode device inode.
1465  * \param filp file pointer.
1466  * \param cmd command.
1467  * \param arg pointer to a drm_buf_map structure.
1468  * \return zero on success or a negative number on failure.
1469  *
1470  * Maps the AGP or SG buffer region with do_mmap(), and copies information
1471  * about each buffer into user space. The PCI buffers are already mapped on the
1472  * addbufs_pci() call.
1473  */
1474 int drm_mapbufs(struct inode *inode, struct file *filp,
1475                 unsigned int cmd, unsigned long arg)
1476 {
1477         drm_file_t *priv = filp->private_data;
1478         drm_device_t *dev = priv->head->dev;
1479         drm_device_dma_t *dma = dev->dma;
1480         drm_buf_map_t __user *argp = (void __user *)arg;
1481         int retcode = 0;
1482         const int zero = 0;
1483         unsigned long virtual;
1484         unsigned long address;
1485         drm_buf_map_t request;
1486         int i;
1487
1488         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1489                 return -EINVAL;
1490
1491         if (!dma)
1492                 return -EINVAL;
1493
1494         spin_lock(&dev->count_lock);
1495         if (atomic_read(&dev->buf_alloc)) {
1496                 spin_unlock(&dev->count_lock);
1497                 return -EBUSY;
1498         }
1499         dev->buf_use++;         /* Can't allocate more after this call */
1500         spin_unlock(&dev->count_lock);
1501
1502         if (copy_from_user(&request, argp, sizeof(request)))
1503                 return -EFAULT;
1504
1505         if (request.count >= dma->buf_count) {
1506                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1507                     || (drm_core_check_feature(dev, DRIVER_SG)
1508                         && (dma->flags & _DRM_DMA_USE_SG))
1509                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1510                         && (dma->flags & _DRM_DMA_USE_FB))) {
1511                         drm_map_t *map = dev->agp_buffer_map;
1512                         unsigned long token = dev->agp_buffer_token;
1513
1514                         if (!map) {
1515                                 retcode = -EINVAL;
1516                                 goto done;
1517                         }
1518
1519                         down_write(&current->mm->mmap_sem);
1520                         virtual = do_mmap(filp, 0, map->size,
1521                                           PROT_READ | PROT_WRITE,
1522                                           MAP_SHARED, token);
1523                         up_write(&current->mm->mmap_sem);
1524                 } else {
1525                         down_write(&current->mm->mmap_sem);
1526                         virtual = do_mmap(filp, 0, dma->byte_count,
1527                                           PROT_READ | PROT_WRITE,
1528                                           MAP_SHARED, 0);
1529                         up_write(&current->mm->mmap_sem);
1530                 }
1531                 if (virtual > -1024UL) {
1532                         /* Real error */
1533                         retcode = (signed long)virtual;
1534                         goto done;
1535                 }
1536                 request.virtual = (void __user *)virtual;
1537
1538                 for (i = 0; i < dma->buf_count; i++) {
1539                         if (copy_to_user(&request.list[i].idx,
1540                                          &dma->buflist[i]->idx,
1541                                          sizeof(request.list[0].idx))) {
1542                                 retcode = -EFAULT;
1543                                 goto done;
1544                         }
1545                         if (copy_to_user(&request.list[i].total,
1546                                          &dma->buflist[i]->total,
1547                                          sizeof(request.list[0].total))) {
1548                                 retcode = -EFAULT;
1549                                 goto done;
1550                         }
1551                         if (copy_to_user(&request.list[i].used,
1552                                          &zero, sizeof(zero))) {
1553                                 retcode = -EFAULT;
1554                                 goto done;
1555                         }
1556                         address = virtual + dma->buflist[i]->offset;    /* *** */
1557                         if (copy_to_user(&request.list[i].address,
1558                                          &address, sizeof(address))) {
1559                                 retcode = -EFAULT;
1560                                 goto done;
1561                         }
1562                 }
1563         }
1564       done:
1565         request.count = dma->buf_count;
1566         DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1567
1568         if (copy_to_user(argp, &request, sizeof(request)))
1569                 return -EFAULT;
1570
1571         return retcode;
1572 }
1573
1574 /**
1575  * Compute size order.  Returns the exponent of the smaller power of two which
1576  * is greater or equal to given number.
1577  *
1578  * \param size size.
1579  * \return order.
1580  *
1581  * \todo Can be made faster.
1582  */
1583 int drm_order(unsigned long size)
1584 {
1585         int order;
1586         unsigned long tmp;
1587
1588         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1589
1590         if (size & (size - 1))
1591                 ++order;
1592
1593         return order;
1594 }
1595 EXPORT_SYMBOL(drm_order);
1596
1597