linux-core/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 EXPORT_SYMBOL(drm_get_resource_len);
  50
  51 static drm_map_list_t *drm_find_matching_map(drm_device_t *dev,
  52                                               drm_local_map_t *map)
  53 {
  54         struct list_head *list;
  55
  56         list_for_each(list, &dev->maplist->head) {
  57                 drm_map_list_t *entry = list_entry(list, drm_map_list_t, head);
  58                 if (entry->map && map->type == entry->map->type &&
  59                     ((entry->map->offset == map->offset) ||
  60                      (map->type == _DRM_SHM && map->flags==_DRM_CONTAINS_LOCK))) {
  61                         return entry;
  62                 }
  63         }
  64
  65         return NULL;
  66 }
  67
  68 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
  73 #if (BITS_PER_LONG == 64)
  74         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  75 #elif (BITS_PER_LONG == 32)
  76         use_hashed_handle = hashed_handle;
  77 #else
  78 #error Unsupported long size. Neither 64 nor 32 bits.
  79 #endif
  80
  81         if (use_hashed_handle) {
  82                 return drm_ht_just_insert_please(&dev->map_hash, hash,
  83                                                  user_token, 32 - PAGE_SHIFT - 3,
  84                                                  PAGE_SHIFT, DRM_MAP_HASH_OFFSET);
  85         } else {
  86                 hash->key = user_token;
  87                 return drm_ht_insert_item(&dev->map_hash, hash);
  88         }
  89 }
  90
  91 /**
  92  * Ioctl to specify a range of memory that is available for mapping by a non-root process.
  93  *
  94  * \param inode device inode.
  95  * \param filp file pointer.
  96  * \param cmd command.
  97  * \param arg pointer to a drm_map structure.
  98  * \return zero on success or a negative value on error.
  99  *
 100  * Adjusts the memory offset to its absolute value according to the mapping
 101  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 102  * applicable and if supported by the kernel.
 103  */
 104 static int drm_addmap_core(drm_device_t * dev, unsigned int offset,
 105                     unsigned int size, drm_map_type_t type,
 106                     drm_map_flags_t flags, drm_map_list_t ** maplist)
 107 {
 108         drm_map_t *map;
 109         drm_map_list_t *list;
 110         drm_dma_handle_t *dmah;
 111         unsigned long user_token;
 112         int ret;
 113
 114         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
 115         if (!map)
 116                 return -ENOMEM;
 117
 118         map->offset = offset;
 119         map->size = size;
 120         map->flags = flags;
 121         map->type = type;
 122
 123         /* Only allow shared memory to be removable since we only keep enough
 124          * book keeping information about shared memory to allow for removal
 125          * when processes fork.
 126          */
 127         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 128                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 129                 return -EINVAL;
 130         }
 131         DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
 132                   map->offset, map->size, map->type);
 133         if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 134                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 135                 return -EINVAL;
 136         }
 137         map->mtrr = -1;
 138         map->handle = NULL;
 139
 140         switch (map->type) {
 141         case _DRM_REGISTERS:
 142         case _DRM_FRAME_BUFFER:
 143 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 144                 if (map->offset + (map->size - 1) < map->offset ||
 145                     map->offset < virt_to_phys(high_memory)) {
 146                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 147                         return -EINVAL;
 148                 }
 149 #endif
 150 #ifdef __alpha__
 151                 map->offset += dev->hose->mem_space->start;
 152 #endif
 153                 /* Some drivers preinitialize some maps, without the X Server
 154                  * needing to be aware of it.  Therefore, we just return success
 155                  * when the server tries to create a duplicate map.
 156                  */
 157                 list = drm_find_matching_map(dev, map);
 158                 if (list != NULL) {
 159                         if (list->map->size != map->size) {
 160                                 DRM_DEBUG("Matching maps of type %d with "
 161                                           "mismatched sizes, (%ld vs %ld)\n",
 162                                           map->type, map->size,
 163                                           list->map->size);
 164                                 list->map->size = map->size;
 165                         }
 166
 167                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 168                         *maplist = list;
 169                         return 0;
 170                 }
 171
 172                 if (drm_core_has_MTRR(dev)) {
 173                         if (map->type == _DRM_FRAME_BUFFER ||
 174                             (map->flags & _DRM_WRITE_COMBINING)) {
 175                                 map->mtrr =  mtrr_add(map->offset, map->size,
 176                                                       MTRR_TYPE_WRCOMB, 1);
 177                         }
 178                 }
 179                 if (map->type == _DRM_REGISTERS)
 180                         map->handle = drm_ioremap(map->offset, map->size, dev);
 181                 break;
 182         case _DRM_SHM:
 183                 list = drm_find_matching_map(dev, map);
 184                 if (list != NULL) {
 185                         if(list->map->size != map->size) {
 186                                 DRM_DEBUG("Matching maps of type %d with "
 187                                    "mismatched sizes, (%ld vs %ld)\n",
 188                                     map->type, map->size, list->map->size);
 189                                 list->map->size = map->size;
 190                         }
 191
 192                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 193                         *maplist = list;
 194                         return 0;
 195                 }
 196                 map->handle = vmalloc_32(map->size);
 197                 DRM_DEBUG("%lu %d %p\n",
 198                           map->size, drm_order(map->size), map->handle);
 199                 if (!map->handle) {
 200                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 201                         return -ENOMEM;
 202                 }
 203                 map->offset = (unsigned long)map->handle;
 204                 if (map->flags & _DRM_CONTAINS_LOCK) {
 205                         /* Prevent a 2nd X Server from creating a 2nd lock */
 206                         if (dev->lock.hw_lock != NULL) {
 207                                 vfree(map->handle);
 208                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 209                                 return -EBUSY;
 210                         }
 211                         dev->sigdata.lock = dev->lock.hw_lock = map->handle;    /* Pointer to lock */
 212                 }
 213                 break;
 214         case _DRM_AGP: {
 215                 drm_agp_mem_t *entry;
 216                 int valid = 0;
 217
 218                 if (!drm_core_has_AGP(dev)) {
 219                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 220                         return -EINVAL;
 221                 }
 222 #ifdef __alpha__
 223                 map->offset += dev->hose->mem_space->start;
 224 #endif
 225                 /* Note: dev->agp->base may actually be 0 when the DRM
 226                  * is not in control of AGP space. But if user space is
 227                  * it should already have added the AGP base itself.
 228                  */
 229                 map->offset += dev->agp->base;
 230                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 231
 232                 /* This assumes the DRM is in total control of AGP space.
 233                  * It's not always the case as AGP can be in the control
 234                  * of user space (i.e. i810 driver). So this loop will get
 235                  * skipped and we double check that dev->agp->memory is
 236                  * actually set as well as being invalid before EPERM'ing
 237                  */
 238                 for (entry = dev->agp->memory; entry; entry = entry->next) {
 239                         if ((map->offset >= entry->bound) &&
 240                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 241                                 valid = 1;
 242                                 break;
 243                         }
 244                 }
 245                 if (dev->agp->memory && !valid) {
 246                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 247                         return -EPERM;
 248                 }
 249                 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
 250                 break;
 251         }
 252         case _DRM_SCATTER_GATHER:
 253                 if (!dev->sg) {
 254                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 255                         return -EINVAL;
 256                 }
 257                 map->offset += (unsigned long)dev->sg->virtual;
 258                 break;
 259         case _DRM_CONSISTENT:
 260                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 261                  * As we're limiting the address to 2^32-1 (or less),
 262                  * casting it down to 32 bits is no problem, but we
 263                  * need to point to a 64bit variable first. */
 264                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 265                 if (!dmah) {
 266                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 267                         return -ENOMEM;
 268                 }
 269                 map->handle = dmah->vaddr;
 270                 map->offset = (unsigned long)dmah->busaddr;
 271                 kfree(dmah);
 272                 break;
 273         default:
 274                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 275                 return -EINVAL;
 276         }
 277
 278         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 279         if (!list) {
 280                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 281                 return -EINVAL;
 282         }
 283         memset(list, 0, sizeof(*list));
 284         list->map = map;
 285
 286         down(&dev->struct_sem);
 287         list_add(&list->head, &dev->maplist->head);
 288
 289         /* Assign a 32-bit handle */
 290
 291         user_token = (map->type == _DRM_SHM) ? (unsigned long) map->handle :
 292                 map->offset;
 293         ret = drm_map_handle(dev, &list->hash, user_token, FALSE);
 294
 295         if (ret) {
 296                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 297                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 298                 up(&dev->struct_sem);
 299                 return ret;
 300         }
 301
 302         list->user_token = list->hash.key;
 303         up(&dev->struct_sem);
 304
 305         *maplist = list;
 306         return 0;
 307 }
 308
 309 int drm_addmap(drm_device_t * dev, unsigned int offset,
 310                unsigned int size, drm_map_type_t type,
 311                drm_map_flags_t flags, drm_local_map_t ** map_ptr)
 312 {
 313         drm_map_list_t *list;
 314         int rc;
 315
 316         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 317         if (!rc)
 318                 *map_ptr = list->map;
 319         return rc;
 320 }
 321
 322 EXPORT_SYMBOL(drm_addmap);
 323
 324 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
 325                      unsigned int cmd, unsigned long arg)
 326 {
 327         drm_file_t *priv = filp->private_data;
 328         drm_device_t *dev = priv->head->dev;
 329         drm_map_t map;
 330         drm_map_list_t *maplist;
 331         drm_map_t __user *argp = (void __user *)arg;
 332         int err;
 333
 334         if (!(filp->f_mode & 3))
 335                 return -EACCES; /* Require read/write */
 336
 337         if (copy_from_user(&map, argp, sizeof(map))) {
 338                 return -EFAULT;
 339         }
 340
 341         if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
 342                 return -EPERM;
 343
 344         err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
 345                               &maplist);
 346
 347         if (err)
 348                 return err;
 349
 350         if (copy_to_user(argp, maplist->map, sizeof(drm_map_t)))
 351                 return -EFAULT;
 352
 353         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 354         if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
 355                 return -EFAULT;
 356         return 0;
 357 }
 358
 359 /**
 360  * Remove a map private from list and deallocate resources if the mapping
 361  * isn't in use.
 362  *
 363  * \param inode device inode.
 364  * \param filp file pointer.
 365  * \param cmd command.
 366  * \param arg pointer to a drm_map_t structure.
 367  * \return zero on success or a negative value on error.
 368  *
 369  * Searches the map on drm_device::maplist, removes it from the list, see if
 370  * its being used, and free any associate resource (such as MTRR's) if it's not
 371  * being on use.
 372  *
 373  * \sa drm_addmap
 374  */
 375 int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
 376 {
 377         struct list_head *list;
 378         drm_map_list_t *r_list = NULL;
 379         drm_dma_handle_t dmah;
 380
 381         /* Find the list entry for the map and remove it */
 382         list_for_each(list, &dev->maplist->head) {
 383                 r_list = list_entry(list, drm_map_list_t, head);
 384
 385                 if (r_list->map == map) {
 386                         list_del(list);
 387                         drm_ht_remove_key(&dev->map_hash, r_list->user_token);
 388                         drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 389                         break;
 390                 }
 391         }
 392
 393         /* List has wrapped around to the head pointer, or it's empty and we
 394          * didn't find anything.
 395          */
 396         if (list == (&dev->maplist->head)) {
 397                 return -EINVAL;
 398         }
 399
 400         switch (map->type) {
 401         case _DRM_REGISTERS:
 402                 drm_ioremapfree(map->handle, map->size, dev);
 403                 /* FALLTHROUGH */
 404         case _DRM_FRAME_BUFFER:
 405                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 406                         int retcode;
 407                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 408                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 409                 }
 410                 break;
 411         case _DRM_SHM:
 412                 vfree(map->handle);
 413                 break;
 414         case _DRM_AGP:
 415         case _DRM_SCATTER_GATHER:
 416                 break;
 417         case _DRM_CONSISTENT:
 418                 dmah.vaddr = map->handle;
 419                 dmah.busaddr = map->offset;
 420                 dmah.size = map->size;
 421                 __drm_pci_free(dev, &dmah);
 422                 break;
 423         }
 424         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 425
 426         return 0;
 427 }
 428 EXPORT_SYMBOL(drm_rmmap_locked);
 429
 430 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
 431 {
 432         int ret;
 433
 434         down(&dev->struct_sem);
 435         ret = drm_rmmap_locked(dev, map);
 436         up(&dev->struct_sem);
 437
 438         return ret;
 439 }
 440 EXPORT_SYMBOL(drm_rmmap);
 441
 442 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 443  * the last close of the device, and this is necessary for cleanup when things
 444  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 445  * like a pointless exercise since they're going away anyway.
 446  *
 447  * One use case might be after addmap is allowed for normal users for SHM and
 448  * gets used by drivers that the server doesn't need to care about.  This seems
 449  * unlikely.
 450  */
 451 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 452                     unsigned int cmd, unsigned long arg)
 453 {
 454         drm_file_t *priv = filp->private_data;
 455         drm_device_t *dev = priv->head->dev;
 456         drm_map_t request;
 457         drm_local_map_t *map = NULL;
 458         struct list_head *list;
 459         int ret;
 460
 461         if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
 462                 return -EFAULT;
 463         }
 464
 465         down(&dev->struct_sem);
 466         list_for_each(list, &dev->maplist->head) {
 467                 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 468
 469                 if (r_list->map &&
 470                     r_list->user_token == (unsigned long)request.handle &&
 471                     r_list->map->flags & _DRM_REMOVABLE) {
 472                         map = r_list->map;
 473                         break;
 474                 }
 475         }
 476
 477         /* List has wrapped around to the head pointer, or its empty we didn't
 478          * find anything.
 479          */
 480         if (list == (&dev->maplist->head)) {
 481                 up(&dev->struct_sem);
 482                 return -EINVAL;
 483         }
 484
 485         if (!map) {
 486                 up(&dev->struct_sem);
 487                 return -EINVAL;
 488         }
 489
 490         /* Register and framebuffer maps are permanent */
 491         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 492                 up(&dev->struct_sem);
 493                 return 0;
 494         }
 495
 496         ret = drm_rmmap_locked(dev, map);
 497
 498         up(&dev->struct_sem);
 499
 500         return ret;
 501 }
 502
 503 /**
 504  * Cleanup after an error on one of the addbufs() functions.
 505  *
 506  * \param dev DRM device.
 507  * \param entry buffer entry where the error occurred.
 508  *
 509  * Frees any pages and buffers associated with the given entry.
 510  */
 511 static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
 512 {
 513         int i;
 514
 515         if (entry->seg_count) {
 516                 for (i = 0; i < entry->seg_count; i++) {
 517                         if (entry->seglist[i]) {
 518                                 drm_pci_free(dev, entry->seglist[i]);
 519                         }
 520                 }
 521                 drm_free(entry->seglist,
 522                          entry->seg_count *
 523                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 524
 525                 entry->seg_count = 0;
 526         }
 527
 528         if (entry->buf_count) {
 529                 for (i = 0; i < entry->buf_count; i++) {
 530                         if (entry->buflist[i].dev_private) {
 531                                 drm_free(entry->buflist[i].dev_private,
 532                                          entry->buflist[i].dev_priv_size,
 533                                          DRM_MEM_BUFS);
 534                         }
 535                 }
 536                 drm_free(entry->buflist,
 537                          entry->buf_count *
 538                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 539
 540                 entry->buf_count = 0;
 541         }
 542 }
 543
 544 #if __OS_HAS_AGP
 545 /**
 546  * Add AGP buffers for DMA transfers
 547  *
 548  * \param dev drm_device_t to which the buffers are to be added.
 549  * \param request pointer to a drm_buf_desc_t describing the request.
 550  * \return zero on success or a negative number on failure.
 551  *
 552  * After some sanity checks creates a drm_buf structure for each buffer and
 553  * reallocates the buffer list of the same size order to accommodate the new
 554  * buffers.
 555  */
 556 int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
 557 {
 558         drm_device_dma_t *dma = dev->dma;
 559         drm_buf_entry_t *entry;
 560         drm_agp_mem_t *agp_entry;
 561         drm_buf_t *buf;
 562         unsigned long offset;
 563         unsigned long agp_offset;
 564         int count;
 565         int order;
 566         int size;
 567         int alignment;
 568         int page_order;
 569         int total;
 570         int byte_count;
 571         int i, valid;
 572         drm_buf_t **temp_buflist;
 573
 574         if (!dma)
 575                 return -EINVAL;
 576
 577         count = request->count;
 578         order = drm_order(request->size);
 579         size = 1 << order;
 580
 581         alignment = (request->flags & _DRM_PAGE_ALIGN)
 582             ? PAGE_ALIGN(size) : size;
 583         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 584         total = PAGE_SIZE << page_order;
 585
 586         byte_count = 0;
 587         agp_offset = dev->agp->base + request->agp_start;
 588
 589         DRM_DEBUG("count:      %d\n", count);
 590         DRM_DEBUG("order:      %d\n", order);
 591         DRM_DEBUG("size:       %d\n", size);
 592         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 593         DRM_DEBUG("alignment:  %d\n", alignment);
 594         DRM_DEBUG("page_order: %d\n", page_order);
 595         DRM_DEBUG("total:      %d\n", total);
 596
 597         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 598                 return -EINVAL;
 599         if (dev->queue_count)
 600                 return -EBUSY;  /* Not while in use */
 601
 602         /* Make sure buffers are located in AGP memory that we own */
 603         valid = 0;
 604         for (agp_entry = dev->agp->memory; agp_entry; agp_entry = agp_entry->next) {
 605                 if ((agp_offset >= agp_entry->bound) &&
 606                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 607                         valid = 1;
 608                         break;
 609                 }
 610         }
 611         if (dev->agp->memory && !valid) {
 612                 DRM_DEBUG("zone invalid\n");
 613                 return -EINVAL;
 614         }
 615         spin_lock(&dev->count_lock);
 616         if (dev->buf_use) {
 617                 spin_unlock(&dev->count_lock);
 618                 return -EBUSY;
 619         }
 620         atomic_inc(&dev->buf_alloc);
 621         spin_unlock(&dev->count_lock);
 622
 623         down(&dev->struct_sem);
 624         entry = &dma->bufs[order];
 625         if (entry->buf_count) {
 626                 up(&dev->struct_sem);
 627                 atomic_dec(&dev->buf_alloc);
 628                 return -ENOMEM; /* May only call once for each order */
 629         }
 630
 631         if (count < 0 || count > 4096) {
 632                 up(&dev->struct_sem);
 633                 atomic_dec(&dev->buf_alloc);
 634                 return -EINVAL;
 635         }
 636
 637         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 638                                    DRM_MEM_BUFS);
 639         if (!entry->buflist) {
 640                 up(&dev->struct_sem);
 641                 atomic_dec(&dev->buf_alloc);
 642                 return -ENOMEM;
 643         }
 644         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 645
 646         entry->buf_size = size;
 647         entry->page_order = page_order;
 648
 649         offset = 0;
 650
 651         while (entry->buf_count < count) {
 652                 buf = &entry->buflist[entry->buf_count];
 653                 buf->idx = dma->buf_count + entry->buf_count;
 654                 buf->total = alignment;
 655                 buf->order = order;
 656                 buf->used = 0;
 657
 658                 buf->offset = (dma->byte_count + offset);
 659                 buf->bus_address = agp_offset + offset;
 660                 buf->address = (void *)(agp_offset + offset);
 661                 buf->next = NULL;
 662                 buf->waiting = 0;
 663                 buf->pending = 0;
 664                 init_waitqueue_head(&buf->dma_wait);
 665                 buf->filp = NULL;
 666
 667                 buf->dev_priv_size = dev->driver->dev_priv_size;
 668                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 669                 if (!buf->dev_private) {
 670                         /* Set count correctly so we free the proper amount. */
 671                         entry->buf_count = count;
 672                         drm_cleanup_buf_error(dev, entry);
 673                         up(&dev->struct_sem);
 674                         atomic_dec(&dev->buf_alloc);
 675                         return -ENOMEM;
 676                 }
 677                 memset(buf->dev_private, 0, buf->dev_priv_size);
 678
 679                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 680
 681                 offset += alignment;
 682                 entry->buf_count++;
 683                 byte_count += PAGE_SIZE << page_order;
 684         }
 685
 686         DRM_DEBUG("byte_count: %d\n", byte_count);
 687
 688         temp_buflist = drm_realloc(dma->buflist,
 689                                    dma->buf_count * sizeof(*dma->buflist),
 690                                    (dma->buf_count + entry->buf_count)
 691                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 692         if (!temp_buflist) {
 693                 /* Free the entry because it isn't valid */
 694                 drm_cleanup_buf_error(dev, entry);
 695                 up(&dev->struct_sem);
 696                 atomic_dec(&dev->buf_alloc);
 697                 return -ENOMEM;
 698         }
 699         dma->buflist = temp_buflist;
 700
 701         for (i = 0; i < entry->buf_count; i++) {
 702                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 703         }
 704
 705         dma->buf_count += entry->buf_count;
 706         dma->seg_count += entry->seg_count;
 707         dma->page_count += byte_count >> PAGE_SHIFT;
 708         dma->byte_count += byte_count;
 709
 710         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 711         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 712
 713         up(&dev->struct_sem);
 714
 715         request->count = entry->buf_count;
 716         request->size = size;
 717
 718         dma->flags = _DRM_DMA_USE_AGP;
 719
 720         atomic_dec(&dev->buf_alloc);
 721         return 0;
 722 }
 723 EXPORT_SYMBOL(drm_addbufs_agp);
 724 #endif                          /* __OS_HAS_AGP */
 725
 726 int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
 727 {
 728         drm_device_dma_t *dma = dev->dma;
 729         int count;
 730         int order;
 731         int size;
 732         int total;
 733         int page_order;
 734         drm_buf_entry_t *entry;
 735         drm_dma_handle_t *dmah;
 736         drm_buf_t *buf;
 737         int alignment;
 738         unsigned long offset;
 739         int i;
 740         int byte_count;
 741         int page_count;
 742         unsigned long *temp_pagelist;
 743         drm_buf_t **temp_buflist;
 744
 745         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 746                 return -EINVAL;
 747
 748         if (!dma)
 749                 return -EINVAL;
 750
 751         if (!capable(CAP_SYS_ADMIN))
 752                 return -EPERM;
 753
 754         count = request->count;
 755         order = drm_order(request->size);
 756         size = 1 << order;
 757
 758         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 759                   request->count, request->size, size, order, dev->queue_count);
 760
 761         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 762                 return -EINVAL;
 763         if (dev->queue_count)
 764                 return -EBUSY;  /* Not while in use */
 765
 766         alignment = (request->flags & _DRM_PAGE_ALIGN)
 767             ? PAGE_ALIGN(size) : size;
 768         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 769         total = PAGE_SIZE << page_order;
 770
 771         spin_lock(&dev->count_lock);
 772         if (dev->buf_use) {
 773                 spin_unlock(&dev->count_lock);
 774                 return -EBUSY;
 775         }
 776         atomic_inc(&dev->buf_alloc);
 777         spin_unlock(&dev->count_lock);
 778
 779         down(&dev->struct_sem);
 780         entry = &dma->bufs[order];
 781         if (entry->buf_count) {
 782                 up(&dev->struct_sem);
 783                 atomic_dec(&dev->buf_alloc);
 784                 return -ENOMEM; /* May only call once for each order */
 785         }
 786
 787         if (count < 0 || count > 4096) {
 788                 up(&dev->struct_sem);
 789                 atomic_dec(&dev->buf_alloc);
 790                 return -EINVAL;
 791         }
 792
 793         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 794                                    DRM_MEM_BUFS);
 795         if (!entry->buflist) {
 796                 up(&dev->struct_sem);
 797                 atomic_dec(&dev->buf_alloc);
 798                 return -ENOMEM;
 799         }
 800         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 801
 802         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 803                                    DRM_MEM_SEGS);
 804         if (!entry->seglist) {
 805                 drm_free(entry->buflist,
 806                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 807                 up(&dev->struct_sem);
 808                 atomic_dec(&dev->buf_alloc);
 809                 return -ENOMEM;
 810         }
 811         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 812
 813         /* Keep the original pagelist until we know all the allocations
 814          * have succeeded
 815          */
 816         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 817                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 818         if (!temp_pagelist) {
 819                 drm_free(entry->buflist,
 820                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 821                 drm_free(entry->seglist,
 822                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 823                 up(&dev->struct_sem);
 824                 atomic_dec(&dev->buf_alloc);
 825                 return -ENOMEM;
 826         }
 827         memcpy(temp_pagelist,
 828                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 829         DRM_DEBUG("pagelist: %d entries\n",
 830                   dma->page_count + (count << page_order));
 831
 832         entry->buf_size = size;
 833         entry->page_order = page_order;
 834         byte_count = 0;
 835         page_count = 0;
 836
 837         while (entry->buf_count < count) {
 838
 839                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 840
 841                 if (!dmah) {
 842                         /* Set count correctly so we free the proper amount. */
 843                         entry->buf_count = count;
 844                         entry->seg_count = count;
 845                         drm_cleanup_buf_error(dev, entry);
 846                         drm_free(temp_pagelist,
 847                                  (dma->page_count + (count << page_order))
 848                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 849                         up(&dev->struct_sem);
 850                         atomic_dec(&dev->buf_alloc);
 851                         return -ENOMEM;
 852                 }
 853                 entry->seglist[entry->seg_count++] = dmah;
 854                 for (i = 0; i < (1 << page_order); i++) {
 855                         DRM_DEBUG("page %d @ 0x%08lx\n",
 856                                   dma->page_count + page_count,
 857                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 858                         temp_pagelist[dma->page_count + page_count++]
 859                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 860                 }
 861                 for (offset = 0;
 862                      offset + size <= total && entry->buf_count < count;
 863                      offset += alignment, ++entry->buf_count) {
 864                         buf = &entry->buflist[entry->buf_count];
 865                         buf->idx = dma->buf_count + entry->buf_count;
 866                         buf->total = alignment;
 867                         buf->order = order;
 868                         buf->used = 0;
 869                         buf->offset = (dma->byte_count + byte_count + offset);
 870                         buf->address = (void *)(dmah->vaddr + offset);
 871                         buf->bus_address = dmah->busaddr + offset;
 872                         buf->next = NULL;
 873                         buf->waiting = 0;
 874                         buf->pending = 0;
 875                         init_waitqueue_head(&buf->dma_wait);
 876                         buf->filp = NULL;
 877
 878                         buf->dev_priv_size = dev->driver->dev_priv_size;
 879                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 880                                                      DRM_MEM_BUFS);
 881                         if (!buf->dev_private) {
 882                                 /* Set count correctly so we free the proper amount. */
 883                                 entry->buf_count = count;
 884                                 entry->seg_count = count;
 885                                 drm_cleanup_buf_error(dev, entry);
 886                                 drm_free(temp_pagelist,
 887                                          (dma->page_count +
 888                                           (count << page_order))
 889                                          * sizeof(*dma->pagelist),
 890                                          DRM_MEM_PAGES);
 891                                 up(&dev->struct_sem);
 892                                 atomic_dec(&dev->buf_alloc);
 893                                 return -ENOMEM;
 894                         }
 895                         memset(buf->dev_private, 0, buf->dev_priv_size);
 896
 897                         DRM_DEBUG("buffer %d @ %p\n",
 898                                   entry->buf_count, buf->address);
 899                 }
 900                 byte_count += PAGE_SIZE << page_order;
 901         }
 902
 903         temp_buflist = drm_realloc(dma->buflist,
 904                                    dma->buf_count * sizeof(*dma->buflist),
 905                                    (dma->buf_count + entry->buf_count)
 906                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 907         if (!temp_buflist) {
 908                 /* Free the entry because it isn't valid */
 909                 drm_cleanup_buf_error(dev, entry);
 910                 drm_free(temp_pagelist,
 911                          (dma->page_count + (count << page_order))
 912                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 913                 up(&dev->struct_sem);
 914                 atomic_dec(&dev->buf_alloc);
 915                 return -ENOMEM;
 916         }
 917         dma->buflist = temp_buflist;
 918
 919         for (i = 0; i < entry->buf_count; i++) {
 920                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 921         }
 922
 923         /* No allocations failed, so now we can replace the orginal pagelist
 924          * with the new one.
 925          */
 926         if (dma->page_count) {
 927                 drm_free(dma->pagelist,
 928                          dma->page_count * sizeof(*dma->pagelist),
 929                          DRM_MEM_PAGES);
 930         }
 931         dma->pagelist = temp_pagelist;
 932
 933         dma->buf_count += entry->buf_count;
 934         dma->seg_count += entry->seg_count;
 935         dma->page_count += entry->seg_count << page_order;
 936         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 937
 938         up(&dev->struct_sem);
 939
 940         request->count = entry->buf_count;
 941         request->size = size;
 942
 943         atomic_dec(&dev->buf_alloc);
 944         return 0;
 945
 946 }
 947 EXPORT_SYMBOL(drm_addbufs_pci);
 948
 949 static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
 950 {
 951         drm_device_dma_t *dma = dev->dma;
 952         drm_buf_entry_t *entry;
 953         drm_buf_t *buf;
 954         unsigned long offset;
 955         unsigned long agp_offset;
 956         int count;
 957         int order;
 958         int size;
 959         int alignment;
 960         int page_order;
 961         int total;
 962         int byte_count;
 963         int i;
 964         drm_buf_t **temp_buflist;
 965
 966         if (!drm_core_check_feature(dev, DRIVER_SG))
 967                 return -EINVAL;
 968
 969         if (!dma)
 970                 return -EINVAL;
 971
 972         if (!capable(CAP_SYS_ADMIN))
 973                 return -EPERM;
 974
 975         count = request->count;
 976         order = drm_order(request->size);
 977         size = 1 << order;
 978
 979         alignment = (request->flags & _DRM_PAGE_ALIGN)
 980             ? PAGE_ALIGN(size) : size;
 981         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 982         total = PAGE_SIZE << page_order;
 983
 984         byte_count = 0;
 985         agp_offset = request->agp_start;
 986
 987         DRM_DEBUG("count:      %d\n", count);
 988         DRM_DEBUG("order:      %d\n", order);
 989         DRM_DEBUG("size:       %d\n", size);
 990         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 991         DRM_DEBUG("alignment:  %d\n", alignment);
 992         DRM_DEBUG("page_order: %d\n", page_order);
 993         DRM_DEBUG("total:      %d\n", total);
 994
 995         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 996                 return -EINVAL;
 997         if (dev->queue_count)
 998                 return -EBUSY;  /* Not while in use */
 999
1000         spin_lock(&dev->count_lock);
1001         if (dev->buf_use) {
1002                 spin_unlock(&dev->count_lock);
1003                 return -EBUSY;
1004         }
1005         atomic_inc(&dev->buf_alloc);
1006         spin_unlock(&dev->count_lock);
1007
1008         down(&dev->struct_sem);
1009         entry = &dma->bufs[order];
1010         if (entry->buf_count) {
1011                 up(&dev->struct_sem);
1012                 atomic_dec(&dev->buf_alloc);
1013                 return -ENOMEM; /* May only call once for each order */
1014         }
1015
1016         if (count < 0 || count > 4096) {
1017                 up(&dev->struct_sem);
1018                 atomic_dec(&dev->buf_alloc);
1019                 return -EINVAL;
1020         }
1021
1022         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1023                                    DRM_MEM_BUFS);
1024         if (!entry->buflist) {
1025                 up(&dev->struct_sem);
1026                 atomic_dec(&dev->buf_alloc);
1027                 return -ENOMEM;
1028         }
1029         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1030
1031         entry->buf_size = size;
1032         entry->page_order = page_order;
1033
1034         offset = 0;
1035
1036         while (entry->buf_count < count) {
1037                 buf = &entry->buflist[entry->buf_count];
1038                 buf->idx = dma->buf_count + entry->buf_count;
1039                 buf->total = alignment;
1040                 buf->order = order;
1041                 buf->used = 0;
1042
1043                 buf->offset = (dma->byte_count + offset);
1044                 buf->bus_address = agp_offset + offset;
1045                 buf->address = (void *)(agp_offset + offset
1046                                         + (unsigned long)dev->sg->virtual);
1047                 buf->next = NULL;
1048                 buf->waiting = 0;
1049                 buf->pending = 0;
1050                 init_waitqueue_head(&buf->dma_wait);
1051                 buf->filp = NULL;
1052
1053                 buf->dev_priv_size = dev->driver->dev_priv_size;
1054                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1055                 if (!buf->dev_private) {
1056                         /* Set count correctly so we free the proper amount. */
1057                         entry->buf_count = count;
1058                         drm_cleanup_buf_error(dev, entry);
1059                         up(&dev->struct_sem);
1060                         atomic_dec(&dev->buf_alloc);
1061                         return -ENOMEM;
1062                 }
1063
1064                 memset(buf->dev_private, 0, buf->dev_priv_size);
1065
1066                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1067
1068                 offset += alignment;
1069                 entry->buf_count++;
1070                 byte_count += PAGE_SIZE << page_order;
1071         }
1072
1073         DRM_DEBUG("byte_count: %d\n", byte_count);
1074
1075         temp_buflist = drm_realloc(dma->buflist,
1076                                    dma->buf_count * sizeof(*dma->buflist),
1077                                    (dma->buf_count + entry->buf_count)
1078                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1079         if (!temp_buflist) {
1080                 /* Free the entry because it isn't valid */
1081                 drm_cleanup_buf_error(dev, entry);
1082                 up(&dev->struct_sem);
1083                 atomic_dec(&dev->buf_alloc);
1084                 return -ENOMEM;
1085         }
1086         dma->buflist = temp_buflist;
1087
1088         for (i = 0; i < entry->buf_count; i++) {
1089                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1090         }
1091
1092         dma->buf_count += entry->buf_count;
1093         dma->seg_count += entry->seg_count;
1094         dma->page_count += byte_count >> PAGE_SHIFT;
1095         dma->byte_count += byte_count;
1096
1097         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1098         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1099
1100         up(&dev->struct_sem);
1101
1102         request->count = entry->buf_count;
1103         request->size = size;
1104
1105         dma->flags = _DRM_DMA_USE_SG;
1106
1107         atomic_dec(&dev->buf_alloc);
1108         return 0;
1109 }
1110
1111 int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
1112 {
1113         drm_device_dma_t *dma = dev->dma;
1114         drm_buf_entry_t *entry;
1115         drm_buf_t *buf;
1116         unsigned long offset;
1117         unsigned long agp_offset;
1118         int count;
1119         int order;
1120         int size;
1121         int alignment;
1122         int page_order;
1123         int total;
1124         int byte_count;
1125         int i;
1126         drm_buf_t **temp_buflist;
1127
1128         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1129                 return -EINVAL;
1130
1131         if (!dma)
1132                 return -EINVAL;
1133
1134         if (!capable(CAP_SYS_ADMIN))
1135                 return -EPERM;
1136
1137         count = request->count;
1138         order = drm_order(request->size);
1139         size = 1 << order;
1140
1141         alignment = (request->flags & _DRM_PAGE_ALIGN)
1142             ? PAGE_ALIGN(size) : size;
1143         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1144         total = PAGE_SIZE << page_order;
1145
1146         byte_count = 0;
1147         agp_offset = request->agp_start;
1148
1149         DRM_DEBUG("count:      %d\n", count);
1150         DRM_DEBUG("order:      %d\n", order);
1151         DRM_DEBUG("size:       %d\n", size);
1152         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1153         DRM_DEBUG("alignment:  %d\n", alignment);
1154         DRM_DEBUG("page_order: %d\n", page_order);
1155         DRM_DEBUG("total:      %d\n", total);
1156
1157         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1158                 return -EINVAL;
1159         if (dev->queue_count)
1160                 return -EBUSY;  /* Not while in use */
1161
1162         spin_lock(&dev->count_lock);
1163         if (dev->buf_use) {
1164                 spin_unlock(&dev->count_lock);
1165                 return -EBUSY;
1166         }
1167         atomic_inc(&dev->buf_alloc);
1168         spin_unlock(&dev->count_lock);
1169
1170         down(&dev->struct_sem);
1171         entry = &dma->bufs[order];
1172         if (entry->buf_count) {
1173                 up(&dev->struct_sem);
1174                 atomic_dec(&dev->buf_alloc);
1175                 return -ENOMEM; /* May only call once for each order */
1176         }
1177
1178         if (count < 0 || count > 4096) {
1179                 up(&dev->struct_sem);
1180                 atomic_dec(&dev->buf_alloc);
1181                 return -EINVAL;
1182         }
1183
1184         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1185                                    DRM_MEM_BUFS);
1186         if (!entry->buflist) {
1187                 up(&dev->struct_sem);
1188                 atomic_dec(&dev->buf_alloc);
1189                 return -ENOMEM;
1190         }
1191         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1192
1193         entry->buf_size = size;
1194         entry->page_order = page_order;
1195
1196         offset = 0;
1197
1198         while (entry->buf_count < count) {
1199                 buf = &entry->buflist[entry->buf_count];
1200                 buf->idx = dma->buf_count + entry->buf_count;
1201                 buf->total = alignment;
1202                 buf->order = order;
1203                 buf->used = 0;
1204
1205                 buf->offset = (dma->byte_count + offset);
1206                 buf->bus_address = agp_offset + offset;
1207                 buf->address = (void *)(agp_offset + offset);
1208                 buf->next = NULL;
1209                 buf->waiting = 0;
1210                 buf->pending = 0;
1211                 init_waitqueue_head(&buf->dma_wait);
1212                 buf->filp = NULL;
1213
1214                 buf->dev_priv_size = dev->driver->dev_priv_size;
1215                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1216                 if (!buf->dev_private) {
1217                         /* Set count correctly so we free the proper amount. */
1218                         entry->buf_count = count;
1219                         drm_cleanup_buf_error(dev, entry);
1220                         up(&dev->struct_sem);
1221                         atomic_dec(&dev->buf_alloc);
1222                         return -ENOMEM;
1223                 }
1224                 memset(buf->dev_private, 0, buf->dev_priv_size);
1225
1226                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1227
1228                 offset += alignment;
1229                 entry->buf_count++;
1230                 byte_count += PAGE_SIZE << page_order;
1231         }
1232
1233         DRM_DEBUG("byte_count: %d\n", byte_count);
1234
1235         temp_buflist = drm_realloc(dma->buflist,
1236                                    dma->buf_count * sizeof(*dma->buflist),
1237                                    (dma->buf_count + entry->buf_count)
1238                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1239         if (!temp_buflist) {
1240                 /* Free the entry because it isn't valid */
1241                 drm_cleanup_buf_error(dev, entry);
1242                 up(&dev->struct_sem);
1243                 atomic_dec(&dev->buf_alloc);
1244                 return -ENOMEM;
1245         }
1246         dma->buflist = temp_buflist;
1247
1248         for (i = 0; i < entry->buf_count; i++) {
1249                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1250         }
1251
1252         dma->buf_count += entry->buf_count;
1253         dma->seg_count += entry->seg_count;
1254         dma->page_count += byte_count >> PAGE_SHIFT;
1255         dma->byte_count += byte_count;
1256
1257         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1258         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1259
1260         up(&dev->struct_sem);
1261
1262         request->count = entry->buf_count;
1263         request->size = size;
1264
1265         dma->flags = _DRM_DMA_USE_FB;
1266
1267         atomic_dec(&dev->buf_alloc);
1268         return 0;
1269 }
1270 EXPORT_SYMBOL(drm_addbufs_fb);
1271
1272
1273 /**
1274  * Add buffers for DMA transfers (ioctl).
1275  *
1276  * \param inode device inode.
1277  * \param filp file pointer.
1278  * \param cmd command.
1279  * \param arg pointer to a drm_buf_desc_t request.
1280  * \return zero on success or a negative number on failure.
1281  *
1282  * According with the memory type specified in drm_buf_desc::flags and the
1283  * build options, it dispatches the call either to addbufs_agp(),
1284  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1285  * PCI memory respectively.
1286  */
1287 int drm_addbufs(struct inode *inode, struct file *filp,
1288                 unsigned int cmd, unsigned long arg)
1289 {
1290         drm_buf_desc_t request;
1291         drm_file_t *priv = filp->private_data;
1292         drm_device_t *dev = priv->head->dev;
1293         int ret;
1294
1295         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1296                 return -EINVAL;
1297
1298         if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
1299                            sizeof(request)))
1300                 return -EFAULT;
1301
1302 #if __OS_HAS_AGP
1303         if (request.flags & _DRM_AGP_BUFFER)
1304                 ret = drm_addbufs_agp(dev, &request);
1305         else
1306 #endif
1307         if (request.flags & _DRM_SG_BUFFER)
1308                 ret = drm_addbufs_sg(dev, &request);
1309         else if (request.flags & _DRM_FB_BUFFER)
1310                 ret = drm_addbufs_fb(dev, &request);
1311         else
1312                 ret = drm_addbufs_pci(dev, &request);
1313
1314         if (ret == 0) {
1315                 if (copy_to_user((void __user *) arg, &request,
1316                                   sizeof(request))) {
1317                         ret = -EFAULT;
1318                 }
1319         }
1320         return ret;
1321 }
1322
1323 /**
1324  * Get information about the buffer mappings.
1325  *
1326  * This was originally mean for debugging purposes, or by a sophisticated
1327  * client library to determine how best to use the available buffers (e.g.,
1328  * large buffers can be used for image transfer).
1329  *
1330  * \param inode device inode.
1331  * \param filp file pointer.
1332  * \param cmd command.
1333  * \param arg pointer to a drm_buf_info structure.
1334  * \return zero on success or a negative number on failure.
1335  *
1336  * Increments drm_device::buf_use while holding the drm_device::count_lock
1337  * lock, preventing of allocating more buffers after this call. Information
1338  * about each requested buffer is then copied into user space.
1339  */
1340 int drm_infobufs(struct inode *inode, struct file *filp,
1341                  unsigned int cmd, unsigned long arg)
1342 {
1343         drm_file_t *priv = filp->private_data;
1344         drm_device_t *dev = priv->head->dev;
1345         drm_device_dma_t *dma = dev->dma;
1346         drm_buf_info_t request;
1347         drm_buf_info_t __user *argp = (void __user *)arg;
1348         int i;
1349         int count;
1350
1351         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1352                 return -EINVAL;
1353
1354         if (!dma)
1355                 return -EINVAL;
1356
1357         spin_lock(&dev->count_lock);
1358         if (atomic_read(&dev->buf_alloc)) {
1359                 spin_unlock(&dev->count_lock);
1360                 return -EBUSY;
1361         }
1362         ++dev->buf_use;         /* Can't allocate more after this call */
1363         spin_unlock(&dev->count_lock);
1364
1365         if (copy_from_user(&request, argp, sizeof(request)))
1366                 return -EFAULT;
1367
1368         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1369                 if (dma->bufs[i].buf_count)
1370                         ++count;
1371         }
1372
1373         DRM_DEBUG("count = %d\n", count);
1374
1375         if (request.count >= count) {
1376                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1377                         if (dma->bufs[i].buf_count) {
1378                                 drm_buf_desc_t __user *to =
1379                                     &request.list[count];
1380                                 drm_buf_entry_t *from = &dma->bufs[i];
1381                                 drm_freelist_t *list = &dma->bufs[i].freelist;
1382                                 if (copy_to_user(&to->count,
1383                                                  &from->buf_count,
1384                                                  sizeof(from->buf_count)) ||
1385                                     copy_to_user(&to->size,
1386                                                  &from->buf_size,
1387                                                  sizeof(from->buf_size)) ||
1388                                     copy_to_user(&to->low_mark,
1389                                                  &list->low_mark,
1390                                                  sizeof(list->low_mark)) ||
1391                                     copy_to_user(&to->high_mark,
1392                                                  &list->high_mark,
1393                                                  sizeof(list->high_mark)))
1394                                         return -EFAULT;
1395
1396                                 DRM_DEBUG("%d %d %d %d %d\n",
1397                                           i,
1398                                           dma->bufs[i].buf_count,
1399                                           dma->bufs[i].buf_size,
1400                                           dma->bufs[i].freelist.low_mark,
1401                                           dma->bufs[i].freelist.high_mark);
1402                                 ++count;
1403                         }
1404                 }
1405         }
1406         request.count = count;
1407
1408         if (copy_to_user(argp, &request, sizeof(request)))
1409                 return -EFAULT;
1410
1411         return 0;
1412 }
1413
1414 /**
1415  * Specifies a low and high water mark for buffer allocation
1416  *
1417  * \param inode device inode.
1418  * \param filp file pointer.
1419  * \param cmd command.
1420  * \param arg a pointer to a drm_buf_desc structure.
1421  * \return zero on success or a negative number on failure.
1422  *
1423  * Verifies that the size order is bounded between the admissible orders and
1424  * updates the respective drm_device_dma::bufs entry low and high water mark.
1425  *
1426  * \note This ioctl is deprecated and mostly never used.
1427  */
1428 int drm_markbufs(struct inode *inode, struct file *filp,
1429                  unsigned int cmd, unsigned long arg)
1430 {
1431         drm_file_t *priv = filp->private_data;
1432         drm_device_t *dev = priv->head->dev;
1433         drm_device_dma_t *dma = dev->dma;
1434         drm_buf_desc_t request;
1435         int order;
1436         drm_buf_entry_t *entry;
1437
1438         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1439                 return -EINVAL;
1440
1441         if (!dma)
1442                 return -EINVAL;
1443
1444         if (copy_from_user(&request,
1445                            (drm_buf_desc_t __user *) arg, sizeof(request)))
1446                 return -EFAULT;
1447
1448         DRM_DEBUG("%d, %d, %d\n",
1449                   request.size, request.low_mark, request.high_mark);
1450         order = drm_order(request.size);
1451         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1452                 return -EINVAL;
1453         entry = &dma->bufs[order];
1454
1455         if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1456                 return -EINVAL;
1457         if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1458                 return -EINVAL;
1459
1460         entry->freelist.low_mark = request.low_mark;
1461         entry->freelist.high_mark = request.high_mark;
1462
1463         return 0;
1464 }
1465
1466 /**
1467  * Unreserve the buffers in list, previously reserved using drmDMA.
1468  *
1469  * \param inode device inode.
1470  * \param filp file pointer.
1471  * \param cmd command.
1472  * \param arg pointer to a drm_buf_free structure.
1473  * \return zero on success or a negative number on failure.
1474  *
1475  * Calls free_buffer() for each used buffer.
1476  * This function is primarily used for debugging.
1477  */
1478 int drm_freebufs(struct inode *inode, struct file *filp,
1479                  unsigned int cmd, unsigned long arg)
1480 {
1481         drm_file_t *priv = filp->private_data;
1482         drm_device_t *dev = priv->head->dev;
1483         drm_device_dma_t *dma = dev->dma;
1484         drm_buf_free_t request;
1485         int i;
1486         int idx;
1487         drm_buf_t *buf;
1488
1489         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1490                 return -EINVAL;
1491
1492         if (!dma)
1493                 return -EINVAL;
1494
1495         if (copy_from_user(&request,
1496                            (drm_buf_free_t __user *) arg, sizeof(request)))
1497                 return -EFAULT;
1498
1499         DRM_DEBUG("%d\n", request.count);
1500         for (i = 0; i < request.count; i++) {
1501                 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1502                         return -EFAULT;
1503                 if (idx < 0 || idx >= dma->buf_count) {
1504                         DRM_ERROR("Index %d (of %d max)\n",
1505                                   idx, dma->buf_count - 1);
1506                         return -EINVAL;
1507                 }
1508                 buf = dma->buflist[idx];
1509                 if (buf->filp != filp) {
1510                         DRM_ERROR("Process %d freeing buffer not owned\n",
1511                                   current->pid);
1512                         return -EINVAL;
1513                 }
1514                 drm_free_buffer(dev, buf);
1515         }
1516
1517         return 0;
1518 }
1519
1520 /**
1521  * Maps all of the DMA buffers into client-virtual space (ioctl).
1522  *
1523  * \param inode device inode.
1524  * \param filp file pointer.
1525  * \param cmd command.
1526  * \param arg pointer to a drm_buf_map structure.
1527  * \return zero on success or a negative number on failure.
1528  *
1529  * Maps the AGP or SG buffer region with do_mmap(), and copies information
1530  * about each buffer into user space. The PCI buffers are already mapped on the
1531  * addbufs_pci() call.
1532  */
1533 int drm_mapbufs(struct inode *inode, struct file *filp,
1534                 unsigned int cmd, unsigned long arg)
1535 {
1536         drm_file_t *priv = filp->private_data;
1537         drm_device_t *dev = priv->head->dev;
1538         drm_device_dma_t *dma = dev->dma;
1539         drm_buf_map_t __user *argp = (void __user *)arg;
1540         int retcode = 0;
1541         const int zero = 0;
1542         unsigned long virtual;
1543         unsigned long address;
1544         drm_buf_map_t request;
1545         int i;
1546
1547         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1548                 return -EINVAL;
1549
1550         if (!dma)
1551                 return -EINVAL;
1552
1553         spin_lock(&dev->count_lock);
1554         if (atomic_read(&dev->buf_alloc)) {
1555                 spin_unlock(&dev->count_lock);
1556                 return -EBUSY;
1557         }
1558         dev->buf_use++;         /* Can't allocate more after this call */
1559         spin_unlock(&dev->count_lock);
1560
1561         if (copy_from_user(&request, argp, sizeof(request)))
1562                 return -EFAULT;
1563
1564         if (request.count >= dma->buf_count) {
1565                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1566                     || (drm_core_check_feature(dev, DRIVER_SG)
1567                         && (dma->flags & _DRM_DMA_USE_SG))
1568                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1569                         && (dma->flags & _DRM_DMA_USE_FB))) {
1570                         drm_map_t *map = dev->agp_buffer_map;
1571                         unsigned long token = dev->agp_buffer_token;
1572
1573                         if (!map) {
1574                                 retcode = -EINVAL;
1575                                 goto done;
1576                         }
1577                         down_write(&current->mm->mmap_sem);
1578                         virtual = do_mmap(filp, 0, map->size,
1579                                           PROT_READ | PROT_WRITE,
1580                                           MAP_SHARED,
1581                                           token);
1582                         up_write(&current->mm->mmap_sem);
1583                 } else {
1584                         down_write(&current->mm->mmap_sem);
1585                         virtual = do_mmap(filp, 0, dma->byte_count,
1586                                           PROT_READ | PROT_WRITE,
1587                                           MAP_SHARED, 0);
1588                         up_write(&current->mm->mmap_sem);
1589                 }
1590                 if (virtual > -1024UL) {
1591                         /* Real error */
1592                         retcode = (signed long)virtual;
1593                         goto done;
1594                 }
1595                 request.virtual = (void __user *)virtual;
1596
1597                 for (i = 0; i < dma->buf_count; i++) {
1598                         if (copy_to_user(&request.list[i].idx,
1599                                          &dma->buflist[i]->idx,
1600                                          sizeof(request.list[0].idx))) {
1601                                 retcode = -EFAULT;
1602                                 goto done;
1603                         }
1604                         if (copy_to_user(&request.list[i].total,
1605                                          &dma->buflist[i]->total,
1606                                          sizeof(request.list[0].total))) {
1607                                 retcode = -EFAULT;
1608                                 goto done;
1609                         }
1610                         if (copy_to_user(&request.list[i].used,
1611                                          &zero, sizeof(zero))) {
1612                                 retcode = -EFAULT;
1613                                 goto done;
1614                         }
1615                         address = virtual + dma->buflist[i]->offset;    /* *** */
1616                         if (copy_to_user(&request.list[i].address,
1617                                          &address, sizeof(address))) {
1618                                 retcode = -EFAULT;
1619                                 goto done;
1620                         }
1621                 }
1622         }
1623       done:
1624         request.count = dma->buf_count;
1625         DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1626
1627         if (copy_to_user(argp, &request, sizeof(request)))
1628                 return -EFAULT;
1629
1630         return retcode;
1631 }
1632
1633 /**
1634  * Compute size order.  Returns the exponent of the smaller power of two which
1635  * is greater or equal to given number.
1636  *
1637  * \param size size.
1638  * \return order.
1639  *
1640  * \todo Can be made faster.
1641  */
1642 int drm_order(unsigned long size)
1643 {
1644         int order;
1645         unsigned long tmp;
1646
1647         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1648
1649         if (size & (size - 1))
1650                 ++order;
1651
1652         return order;
1653 }
1654 EXPORT_SYMBOL(drm_order);
1655
1656