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(struct drm_device *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(struct drm_device *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 struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  53                                              drm_local_map_t *map)
  54 {
  55         struct drm_map_list *entry;
  56         list_for_each_entry(entry, &dev->maplist, head) {
  57                 if (entry->map && map->type == entry->map->type &&
  58                     ((entry->map->offset == map->offset) ||
  59                      (map->type == _DRM_SHM && map->flags==_DRM_CONTAINS_LOCK))) {
  60                         return entry;
  61                 }
  62         }
  63
  64         return NULL;
  65 }
  66
  67 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  68                           unsigned long user_token, int hashed_handle)
  69 {
  70         int use_hashed_handle;
  71 #if (BITS_PER_LONG == 64)
  72         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  73 #elif (BITS_PER_LONG == 32)
  74         use_hashed_handle = hashed_handle;
  75 #else
  76 #error Unsupported long size. Neither 64 nor 32 bits.
  77 #endif
  78
  79         if (!use_hashed_handle) {
  80                 int ret;
  81                 hash->key = user_token >> PAGE_SHIFT;
  82                 ret = drm_ht_insert_item(&dev->map_hash, hash);
  83                 if (ret != -EINVAL)
  84                         return ret;
  85         }
  86         return drm_ht_just_insert_please(&dev->map_hash, hash,
  87                                          user_token, 32 - PAGE_SHIFT - 3,
  88                                          0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT);
  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 file_priv DRM file private.
  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(struct drm_device * dev, unsigned int offset,
 105                            unsigned int size, enum drm_map_type type,
 106                            enum drm_map_flags flags,
 107                            struct drm_map_list ** maplist)
 108 {
 109         struct drm_map *map;
 110         struct drm_map_list *list;
 111         drm_dma_handle_t *dmah;
 112         unsigned long user_token;
 113         int ret;
 114
 115         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
 116         if (!map)
 117                 return -ENOMEM;
 118
 119         map->offset = offset;
 120         map->size = size;
 121         map->flags = flags;
 122         map->type = type;
 123
 124         /* Only allow shared memory to be removable since we only keep enough
 125          * book keeping information about shared memory to allow for removal
 126          * when processes fork.
 127          */
 128         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 129                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 130                 return -EINVAL;
 131         }
 132         DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
 133                   map->offset, map->size, map->type);
 134         if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 135                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 136                 return -EINVAL;
 137         }
 138         map->mtrr = -1;
 139         map->handle = NULL;
 140
 141         switch (map->type) {
 142         case _DRM_REGISTERS:
 143         case _DRM_FRAME_BUFFER:
 144 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 145                 if (map->offset + (map->size-1) < map->offset ||
 146                     map->offset < virt_to_phys(high_memory)) {
 147                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 148                         return -EINVAL;
 149                 }
 150 #endif
 151 #ifdef __alpha__
 152                 map->offset += dev->hose->mem_space->start;
 153 #endif
 154                 /* Some drivers preinitialize some maps, without the X Server
 155                  * needing to be aware of it.  Therefore, we just return success
 156                  * when the server tries to create a duplicate map.
 157                  */
 158                 list = drm_find_matching_map(dev, map);
 159                 if (list != NULL) {
 160                         if (list->map->size != map->size) {
 161                                 DRM_DEBUG("Matching maps of type %d with "
 162                                           "mismatched sizes, (%ld vs %ld)\n",
 163                                           map->type, map->size,
 164                                           list->map->size);
 165                                 list->map->size = map->size;
 166                         }
 167
 168                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 169                         *maplist = list;
 170                         return 0;
 171                 }
 172
 173                 if (drm_core_has_MTRR(dev)) {
 174                         if (map->type == _DRM_FRAME_BUFFER ||
 175                             (map->flags & _DRM_WRITE_COMBINING)) {
 176                                 map->mtrr = mtrr_add(map->offset, map->size,
 177                                                      MTRR_TYPE_WRCOMB, 1);
 178                         }
 179                 }
 180                 if (map->type == _DRM_REGISTERS) {
 181                         map->handle = ioremap(map->offset, map->size);
 182                         if (!map->handle) {
 183                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 184                                 return -ENOMEM;
 185                         }
 186                 }
 187
 188                 break;
 189         case _DRM_SHM:
 190                 list = drm_find_matching_map(dev, map);
 191                 if (list != NULL) {
 192                         if(list->map->size != map->size) {
 193                                 DRM_DEBUG("Matching maps of type %d with "
 194                                           "mismatched sizes, (%ld vs %ld)\n",
 195                                           map->type, map->size, list->map->size);
 196                                 list->map->size = map->size;
 197                         }
 198
 199                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 200                         *maplist = list;
 201                         return 0;
 202                 }
 203                 map->handle = vmalloc_user(map->size);
 204                 DRM_DEBUG("%lu %d %p\n",
 205                           map->size, drm_order(map->size), map->handle);
 206                 if (!map->handle) {
 207                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 208                         return -ENOMEM;
 209                 }
 210                 map->offset = (unsigned long)map->handle;
 211                 if (map->flags & _DRM_CONTAINS_LOCK) {
 212                         /* Prevent a 2nd X Server from creating a 2nd lock */
 213                         if (dev->lock.hw_lock != NULL) {
 214                                 vfree(map->handle);
 215                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 216                                 return -EBUSY;
 217                         }
 218                         dev->sigdata.lock = dev->lock.hw_lock = map->handle;    /* Pointer to lock */
 219                 }
 220                 break;
 221         case _DRM_AGP: {
 222                 struct drm_agp_mem *entry;
 223                 int valid = 0;
 224
 225                 if (!drm_core_has_AGP(dev)) {
 226                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 227                         return -EINVAL;
 228                 }
 229 #ifdef __alpha__
 230                 map->offset += dev->hose->mem_space->start;
 231 #endif
 232                 /* Note: dev->agp->base may actually be 0 when the DRM
 233                  * is not in control of AGP space. But if user space is
 234                  * it should already have added the AGP base itself.
 235                  */
 236                 map->offset += dev->agp->base;
 237                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 238
 239                 /* This assumes the DRM is in total control of AGP space.
 240                  * It's not always the case as AGP can be in the control
 241                  * of user space (i.e. i810 driver). So this loop will get
 242                  * skipped and we double check that dev->agp->memory is
 243                  * actually set as well as being invalid before EPERM'ing
 244                  */
 245                 list_for_each_entry(entry, &dev->agp->memory, head) {
 246                         if ((map->offset >= entry->bound) &&
 247                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 248                                 valid = 1;
 249                                 break;
 250                         }
 251                 }
 252                 if (!list_empty(&dev->agp->memory) && !valid) {
 253                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 254                         return -EPERM;
 255                 }
 256                 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
 257
 258                 break;
 259         }
 260         case _DRM_SCATTER_GATHER:
 261                 if (!dev->sg) {
 262                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 263                         return -EINVAL;
 264                 }
 265                 map->offset += (unsigned long)dev->sg->virtual;
 266                 break;
 267         case _DRM_CONSISTENT:
 268                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 269                  * As we're limiting the address to 2^32-1 (or less),
 270                  * casting it down to 32 bits is no problem, but we
 271                  * need to point to a 64bit variable first. */
 272                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 273                 if (!dmah) {
 274                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 275                         return -ENOMEM;
 276                 }
 277                 map->handle = dmah->vaddr;
 278                 map->offset = (unsigned long)dmah->busaddr;
 279                 kfree(dmah);
 280                 break;
 281         default:
 282                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 283                 return -EINVAL;
 284         }
 285
 286         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 287         if (!list) {
 288                 if (map->type == _DRM_REGISTERS)
 289                         iounmap(map->handle);
 290                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 291                 return -EINVAL;
 292         }
 293         memset(list, 0, sizeof(*list));
 294         list->map = map;
 295
 296         mutex_lock(&dev->struct_mutex);
 297         list_add(&list->head, &dev->maplist);
 298
 299         /* Assign a 32-bit handle */
 300         /* We do it here so that dev->struct_mutex protects the increment */
 301         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 302                 map->offset;
 303         ret = drm_map_handle(dev, &list->hash, user_token, 0);
 304         if (ret) {
 305                 if (map->type == _DRM_REGISTERS)
 306                         iounmap(map->handle);
 307                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 308                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 309                 mutex_unlock(&dev->struct_mutex);
 310                 return ret;
 311         }
 312
 313         list->user_token = list->hash.key << PAGE_SHIFT;
 314         mutex_unlock(&dev->struct_mutex);
 315
 316         *maplist = list;
 317         return 0;
 318         }
 319
 320 int drm_addmap(struct drm_device * dev, unsigned int offset,
 321                unsigned int size, enum drm_map_type type,
 322                enum drm_map_flags flags, drm_local_map_t ** map_ptr)
 323 {
 324         struct drm_map_list *list;
 325         int rc;
 326
 327         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 328         if (!rc)
 329                 *map_ptr = list->map;
 330         return rc;
 331 }
 332
 333 EXPORT_SYMBOL(drm_addmap);
 334
 335 int drm_addmap_ioctl(struct inode *inode, struct drm_file *file_priv,
 336                      unsigned int cmd, unsigned long arg)
 337 {
 338         struct drm_device *dev = file_priv->head->dev;
 339         struct drm_map map;
 340         struct drm_map_list *maplist;
 341         struct drm_map __user *argp = (void __user *)arg;
 342         int err;
 343
 344         if (copy_from_user(&map, argp, sizeof(map))) {
 345                 return -EFAULT;
 346         }
 347
 348         if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
 349                 return -EPERM;
 350
 351         err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
 352                               &maplist);
 353
 354         if (err)
 355                 return err;
 356
 357         if (copy_to_user(argp, maplist->map, sizeof(struct drm_map)))
 358                 return -EFAULT;
 359
 360         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 361         if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
 362                 return -EFAULT;
 363         return 0;
 364 }
 365
 366 /**
 367  * Remove a map private from list and deallocate resources if the mapping
 368  * isn't in use.
 369  *
 370  * \param inode device inode.
 371  * \param file_priv DRM file private.
 372  * \param cmd command.
 373  * \param arg pointer to a struct drm_map structure.
 374  * \return zero on success or a negative value on error.
 375  *
 376  * Searches the map on drm_device::maplist, removes it from the list, see if
 377  * its being used, and free any associate resource (such as MTRR's) if it's not
 378  * being on use.
 379  *
 380  * \sa drm_addmap
 381  */
 382 int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
 383 {
 384         struct drm_map_list *r_list = NULL, *list_t;
 385         drm_dma_handle_t dmah;
 386         int found = 0;
 387
 388         /* Find the list entry for the map and remove it */
 389         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 390                 if (r_list->map == map) {
 391                         list_del(&r_list->head);
 392                         drm_ht_remove_key(&dev->map_hash,
 393                                           r_list->user_token >> PAGE_SHIFT);
 394                         drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
 395                         found = 1;
 396                         break;
 397                 }
 398         }
 399
 400         if (!found)
 401                 return -EINVAL;
 402
 403         switch (map->type) {
 404         case _DRM_REGISTERS:
 405                 iounmap(map->handle);
 406                 /* FALLTHROUGH */
 407         case _DRM_FRAME_BUFFER:
 408                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 409                         int retcode;
 410                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 411                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 412                 }
 413                 break;
 414         case _DRM_SHM:
 415                 vfree(map->handle);
 416                 break;
 417         case _DRM_AGP:
 418         case _DRM_SCATTER_GATHER:
 419                 break;
 420         case _DRM_CONSISTENT:
 421                 dmah.vaddr = map->handle;
 422                 dmah.busaddr = map->offset;
 423                 dmah.size = map->size;
 424                 __drm_pci_free(dev, &dmah);
 425                 break;
 426         }
 427         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 428
 429         return 0;
 430 }
 431
 432 int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
 433 {
 434         int ret;
 435
 436         mutex_lock(&dev->struct_mutex);
 437         ret = drm_rmmap_locked(dev, map);
 438         mutex_unlock(&dev->struct_mutex);
 439
 440         return ret;
 441 }
 442
 443 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 444  * the last close of the device, and this is necessary for cleanup when things
 445  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 446  * like a pointless exercise since they're going away anyway.
 447  *
 448  * One use case might be after addmap is allowed for normal users for SHM and
 449  * gets used by drivers that the server doesn't need to care about.  This seems
 450  * unlikely.
 451  */
 452 int drm_rmmap_ioctl(struct inode *inode, struct drm_file *file_priv,
 453                     unsigned int cmd, unsigned long arg)
 454 {
 455         struct drm_device *dev = file_priv->head->dev;
 456         struct drm_map request;
 457         drm_local_map_t *map = NULL;
 458         struct drm_map_list *r_list;
 459         int ret;
 460
 461         if (copy_from_user(&request, (struct drm_map __user *) arg, sizeof(request))) {
 462                 return -EFAULT;
 463         }
 464
 465         mutex_lock(&dev->struct_mutex);
 466         list_for_each_entry(r_list, &dev->maplist, head) {
 467                 if (r_list->map &&
 468                     r_list->user_token == (unsigned long)request.handle &&
 469                     r_list->map->flags & _DRM_REMOVABLE) {
 470                         map = r_list->map;
 471                         break;
 472                 }
 473         }
 474
 475         /* List has wrapped around to the head pointer, or its empty we didn't
 476          * find anything.
 477          */
 478         if (list_empty(&dev->maplist) || !map) {
 479                 mutex_unlock(&dev->struct_mutex);
 480                 return -EINVAL;
 481         }
 482
 483         /* Register and framebuffer maps are permanent */
 484         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 485                 mutex_unlock(&dev->struct_mutex);
 486                 return 0;
 487         }
 488
 489         ret = drm_rmmap_locked(dev, map);
 490
 491         mutex_unlock(&dev->struct_mutex);
 492
 493         return ret;
 494 }
 495
 496 /**
 497  * Cleanup after an error on one of the addbufs() functions.
 498  *
 499  * \param dev DRM device.
 500  * \param entry buffer entry where the error occurred.
 501  *
 502  * Frees any pages and buffers associated with the given entry.
 503  */
 504 static void drm_cleanup_buf_error(struct drm_device * dev,
 505                                   struct drm_buf_entry * entry)
 506 {
 507         int i;
 508
 509         if (entry->seg_count) {
 510                 for (i = 0; i < entry->seg_count; i++) {
 511                         if (entry->seglist[i]) {
 512                                 drm_pci_free(dev, entry->seglist[i]);
 513                         }
 514                 }
 515                 drm_free(entry->seglist,
 516                          entry->seg_count *
 517                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 518
 519                 entry->seg_count = 0;
 520         }
 521
 522         if (entry->buf_count) {
 523                 for (i = 0; i < entry->buf_count; i++) {
 524                         if (entry->buflist[i].dev_private) {
 525                                 drm_free(entry->buflist[i].dev_private,
 526                                          entry->buflist[i].dev_priv_size,
 527                                          DRM_MEM_BUFS);
 528                         }
 529                 }
 530                 drm_free(entry->buflist,
 531                          entry->buf_count *
 532                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 533
 534                 entry->buf_count = 0;
 535         }
 536 }
 537
 538 #if __OS_HAS_AGP
 539 /**
 540  * Add AGP buffers for DMA transfers.
 541  *
 542  * \param dev struct drm_device to which the buffers are to be added.
 543  * \param request pointer to a struct drm_buf_desc describing the request.
 544  * \return zero on success or a negative number on failure.
 545  *
 546  * After some sanity checks creates a drm_buf structure for each buffer and
 547  * reallocates the buffer list of the same size order to accommodate the new
 548  * buffers.
 549  */
 550 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 551 {
 552         struct drm_device_dma *dma = dev->dma;
 553         struct drm_buf_entry *entry;
 554         struct drm_agp_mem *agp_entry;
 555         struct drm_buf *buf;
 556         unsigned long offset;
 557         unsigned long agp_offset;
 558         int count;
 559         int order;
 560         int size;
 561         int alignment;
 562         int page_order;
 563         int total;
 564         int byte_count;
 565         int i, valid;
 566         struct drm_buf **temp_buflist;
 567
 568         if (!dma)
 569                 return -EINVAL;
 570
 571         count = request->count;
 572         order = drm_order(request->size);
 573         size = 1 << order;
 574
 575         alignment = (request->flags & _DRM_PAGE_ALIGN)
 576             ? PAGE_ALIGN(size) : size;
 577         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 578         total = PAGE_SIZE << page_order;
 579
 580         byte_count = 0;
 581         agp_offset = dev->agp->base + request->agp_start;
 582
 583         DRM_DEBUG("count:      %d\n", count);
 584         DRM_DEBUG("order:      %d\n", order);
 585         DRM_DEBUG("size:       %d\n", size);
 586         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 587         DRM_DEBUG("alignment:  %d\n", alignment);
 588         DRM_DEBUG("page_order: %d\n", page_order);
 589         DRM_DEBUG("total:      %d\n", total);
 590
 591         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 592                 return -EINVAL;
 593         if (dev->queue_count)
 594                 return -EBUSY;  /* Not while in use */
 595
 596         /* Make sure buffers are located in AGP memory that we own */
 597         valid = 0;
 598         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 599                 if ((agp_offset >= agp_entry->bound) &&
 600                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 601                         valid = 1;
 602                         break;
 603                 }
 604         }
 605         if (!list_empty(&dev->agp->memory) && !valid) {
 606                 DRM_DEBUG("zone invalid\n");
 607                 return -EINVAL;
 608         }
 609         spin_lock(&dev->count_lock);
 610         if (dev->buf_use) {
 611                 spin_unlock(&dev->count_lock);
 612                 return -EBUSY;
 613         }
 614         atomic_inc(&dev->buf_alloc);
 615         spin_unlock(&dev->count_lock);
 616
 617         mutex_lock(&dev->struct_mutex);
 618         entry = &dma->bufs[order];
 619         if (entry->buf_count) {
 620                 mutex_unlock(&dev->struct_mutex);
 621                 atomic_dec(&dev->buf_alloc);
 622                 return -ENOMEM; /* May only call once for each order */
 623         }
 624
 625         if (count < 0 || count > 4096) {
 626                 mutex_unlock(&dev->struct_mutex);
 627                 atomic_dec(&dev->buf_alloc);
 628                 return -EINVAL;
 629         }
 630
 631         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 632                                    DRM_MEM_BUFS);
 633         if (!entry->buflist) {
 634                 mutex_unlock(&dev->struct_mutex);
 635                 atomic_dec(&dev->buf_alloc);
 636                 return -ENOMEM;
 637         }
 638         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 639
 640         entry->buf_size = size;
 641         entry->page_order = page_order;
 642
 643         offset = 0;
 644
 645         while (entry->buf_count < count) {
 646                 buf = &entry->buflist[entry->buf_count];
 647                 buf->idx = dma->buf_count + entry->buf_count;
 648                 buf->total = alignment;
 649                 buf->order = order;
 650                 buf->used = 0;
 651
 652                 buf->offset = (dma->byte_count + offset);
 653                 buf->bus_address = agp_offset + offset;
 654                 buf->address = (void *)(agp_offset + offset);
 655                 buf->next = NULL;
 656                 buf->waiting = 0;
 657                 buf->pending = 0;
 658                 init_waitqueue_head(&buf->dma_wait);
 659                 buf->file_priv = NULL;
 660
 661                 buf->dev_priv_size = dev->driver->dev_priv_size;
 662                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 663                 if (!buf->dev_private) {
 664                         /* Set count correctly so we free the proper amount. */
 665                         entry->buf_count = count;
 666                         drm_cleanup_buf_error(dev, entry);
 667                         mutex_unlock(&dev->struct_mutex);
 668                         atomic_dec(&dev->buf_alloc);
 669                         return -ENOMEM;
 670                 }
 671                 memset(buf->dev_private, 0, buf->dev_priv_size);
 672
 673                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 674
 675                 offset += alignment;
 676                 entry->buf_count++;
 677                 byte_count += PAGE_SIZE << page_order;
 678         }
 679
 680         DRM_DEBUG("byte_count: %d\n", byte_count);
 681
 682         temp_buflist = drm_realloc(dma->buflist,
 683                                    dma->buf_count * sizeof(*dma->buflist),
 684                                    (dma->buf_count + entry->buf_count)
 685                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 686         if (!temp_buflist) {
 687                 /* Free the entry because it isn't valid */
 688                 drm_cleanup_buf_error(dev, entry);
 689                 mutex_unlock(&dev->struct_mutex);
 690                 atomic_dec(&dev->buf_alloc);
 691                 return -ENOMEM;
 692         }
 693         dma->buflist = temp_buflist;
 694
 695         for (i = 0; i < entry->buf_count; i++) {
 696                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 697         }
 698
 699         dma->buf_count += entry->buf_count;
 700         dma->seg_count += entry->seg_count;
 701         dma->page_count += byte_count >> PAGE_SHIFT;
 702         dma->byte_count += byte_count;
 703
 704         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 705         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 706
 707         mutex_unlock(&dev->struct_mutex);
 708
 709         request->count = entry->buf_count;
 710         request->size = size;
 711
 712         dma->flags = _DRM_DMA_USE_AGP;
 713
 714         atomic_dec(&dev->buf_alloc);
 715         return 0;
 716 }
 717 EXPORT_SYMBOL(drm_addbufs_agp);
 718 #endif                          /* __OS_HAS_AGP */
 719
 720 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 721 {
 722         struct drm_device_dma *dma = dev->dma;
 723         int count;
 724         int order;
 725         int size;
 726         int total;
 727         int page_order;
 728         struct drm_buf_entry *entry;
 729         drm_dma_handle_t *dmah;
 730         struct drm_buf *buf;
 731         int alignment;
 732         unsigned long offset;
 733         int i;
 734         int byte_count;
 735         int page_count;
 736         unsigned long *temp_pagelist;
 737         struct drm_buf **temp_buflist;
 738
 739         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 740                 return -EINVAL;
 741
 742         if (!dma)
 743                 return -EINVAL;
 744
 745         if (!capable(CAP_SYS_ADMIN))
 746                 return -EPERM;
 747
 748         count = request->count;
 749         order = drm_order(request->size);
 750         size = 1 << order;
 751
 752         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 753                   request->count, request->size, size, order, dev->queue_count);
 754
 755         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 756                 return -EINVAL;
 757         if (dev->queue_count)
 758                 return -EBUSY;  /* Not while in use */
 759
 760         alignment = (request->flags & _DRM_PAGE_ALIGN)
 761             ? PAGE_ALIGN(size) : size;
 762         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 763         total = PAGE_SIZE << page_order;
 764
 765         spin_lock(&dev->count_lock);
 766         if (dev->buf_use) {
 767                 spin_unlock(&dev->count_lock);
 768                 return -EBUSY;
 769         }
 770         atomic_inc(&dev->buf_alloc);
 771         spin_unlock(&dev->count_lock);
 772
 773         mutex_lock(&dev->struct_mutex);
 774         entry = &dma->bufs[order];
 775         if (entry->buf_count) {
 776                 mutex_unlock(&dev->struct_mutex);
 777                 atomic_dec(&dev->buf_alloc);
 778                 return -ENOMEM; /* May only call once for each order */
 779         }
 780
 781         if (count < 0 || count > 4096) {
 782                 mutex_unlock(&dev->struct_mutex);
 783                 atomic_dec(&dev->buf_alloc);
 784                 return -EINVAL;
 785         }
 786
 787         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 788                                    DRM_MEM_BUFS);
 789         if (!entry->buflist) {
 790                 mutex_unlock(&dev->struct_mutex);
 791                 atomic_dec(&dev->buf_alloc);
 792                 return -ENOMEM;
 793         }
 794         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 795
 796         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 797                                    DRM_MEM_SEGS);
 798         if (!entry->seglist) {
 799                 drm_free(entry->buflist,
 800                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 801                 mutex_unlock(&dev->struct_mutex);
 802                 atomic_dec(&dev->buf_alloc);
 803                 return -ENOMEM;
 804         }
 805         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 806
 807         /* Keep the original pagelist until we know all the allocations
 808          * have succeeded
 809          */
 810         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 811                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 812         if (!temp_pagelist) {
 813                 drm_free(entry->buflist,
 814                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 815                 drm_free(entry->seglist,
 816                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 817                 mutex_unlock(&dev->struct_mutex);
 818                 atomic_dec(&dev->buf_alloc);
 819                 return -ENOMEM;
 820         }
 821         memcpy(temp_pagelist,
 822                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 823         DRM_DEBUG("pagelist: %d entries\n",
 824                   dma->page_count + (count << page_order));
 825
 826         entry->buf_size = size;
 827         entry->page_order = page_order;
 828         byte_count = 0;
 829         page_count = 0;
 830
 831         while (entry->buf_count < count) {
 832
 833                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 834
 835                 if (!dmah) {
 836                         /* Set count correctly so we free the proper amount. */
 837                         entry->buf_count = count;
 838                         entry->seg_count = count;
 839                         drm_cleanup_buf_error(dev, entry);
 840                         drm_free(temp_pagelist,
 841                                  (dma->page_count + (count << page_order))
 842                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 843                         mutex_unlock(&dev->struct_mutex);
 844                         atomic_dec(&dev->buf_alloc);
 845                         return -ENOMEM;
 846                 }
 847                 entry->seglist[entry->seg_count++] = dmah;
 848                 for (i = 0; i < (1 << page_order); i++) {
 849                         DRM_DEBUG("page %d @ 0x%08lx\n",
 850                                   dma->page_count + page_count,
 851                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 852                         temp_pagelist[dma->page_count + page_count++]
 853                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 854                 }
 855                 for (offset = 0;
 856                      offset + size <= total && entry->buf_count < count;
 857                      offset += alignment, ++entry->buf_count) {
 858                         buf = &entry->buflist[entry->buf_count];
 859                         buf->idx = dma->buf_count + entry->buf_count;
 860                         buf->total = alignment;
 861                         buf->order = order;
 862                         buf->used = 0;
 863                         buf->offset = (dma->byte_count + byte_count + offset);
 864                         buf->address = (void *)(dmah->vaddr + offset);
 865                         buf->bus_address = dmah->busaddr + offset;
 866                         buf->next = NULL;
 867                         buf->waiting = 0;
 868                         buf->pending = 0;
 869                         init_waitqueue_head(&buf->dma_wait);
 870                         buf->file_priv = NULL;
 871
 872                         buf->dev_priv_size = dev->driver->dev_priv_size;
 873                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 874                                                      DRM_MEM_BUFS);
 875                         if (!buf->dev_private) {
 876                                 /* Set count correctly so we free the proper amount. */
 877                                 entry->buf_count = count;
 878                                 entry->seg_count = count;
 879                                 drm_cleanup_buf_error(dev, entry);
 880                                 drm_free(temp_pagelist,
 881                                          (dma->page_count +
 882                                           (count << page_order))
 883                                          * sizeof(*dma->pagelist),
 884                                          DRM_MEM_PAGES);
 885                                 mutex_unlock(&dev->struct_mutex);
 886                                 atomic_dec(&dev->buf_alloc);
 887                                 return -ENOMEM;
 888                         }
 889                         memset(buf->dev_private, 0, buf->dev_priv_size);
 890
 891                         DRM_DEBUG("buffer %d @ %p\n",
 892                                   entry->buf_count, buf->address);
 893                 }
 894                 byte_count += PAGE_SIZE << page_order;
 895         }
 896
 897         temp_buflist = drm_realloc(dma->buflist,
 898                                    dma->buf_count * sizeof(*dma->buflist),
 899                                    (dma->buf_count + entry->buf_count)
 900                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 901         if (!temp_buflist) {
 902                 /* Free the entry because it isn't valid */
 903                 drm_cleanup_buf_error(dev, entry);
 904                 drm_free(temp_pagelist,
 905                          (dma->page_count + (count << page_order))
 906                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 907                 mutex_unlock(&dev->struct_mutex);
 908                 atomic_dec(&dev->buf_alloc);
 909                 return -ENOMEM;
 910         }
 911         dma->buflist = temp_buflist;
 912
 913         for (i = 0; i < entry->buf_count; i++) {
 914                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 915         }
 916
 917         /* No allocations failed, so now we can replace the orginal pagelist
 918          * with the new one.
 919          */
 920         if (dma->page_count) {
 921                 drm_free(dma->pagelist,
 922                          dma->page_count * sizeof(*dma->pagelist),
 923                          DRM_MEM_PAGES);
 924         }
 925         dma->pagelist = temp_pagelist;
 926
 927         dma->buf_count += entry->buf_count;
 928         dma->seg_count += entry->seg_count;
 929         dma->page_count += entry->seg_count << page_order;
 930         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 931
 932         mutex_unlock(&dev->struct_mutex);
 933
 934         request->count = entry->buf_count;
 935         request->size = size;
 936
 937         if (request->flags & _DRM_PCI_BUFFER_RO)
 938                 dma->flags = _DRM_DMA_USE_PCI_RO;
 939
 940         atomic_dec(&dev->buf_alloc);
 941         return 0;
 942
 943 }
 944 EXPORT_SYMBOL(drm_addbufs_pci);
 945
 946 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 947 {
 948         struct drm_device_dma *dma = dev->dma;
 949         struct drm_buf_entry *entry;
 950         struct drm_buf *buf;
 951         unsigned long offset;
 952         unsigned long agp_offset;
 953         int count;
 954         int order;
 955         int size;
 956         int alignment;
 957         int page_order;
 958         int total;
 959         int byte_count;
 960         int i;
 961         struct drm_buf **temp_buflist;
 962
 963         if (!drm_core_check_feature(dev, DRIVER_SG))
 964                 return -EINVAL;
 965
 966         if (!dma)
 967                 return -EINVAL;
 968
 969         if (!capable(CAP_SYS_ADMIN))
 970                 return -EPERM;
 971
 972         count = request->count;
 973         order = drm_order(request->size);
 974         size = 1 << order;
 975
 976         alignment = (request->flags & _DRM_PAGE_ALIGN)
 977             ? PAGE_ALIGN(size) : size;
 978         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 979         total = PAGE_SIZE << page_order;
 980
 981         byte_count = 0;
 982         agp_offset = request->agp_start;
 983
 984         DRM_DEBUG("count:      %d\n", count);
 985         DRM_DEBUG("order:      %d\n", order);
 986         DRM_DEBUG("size:       %d\n", size);
 987         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 988         DRM_DEBUG("alignment:  %d\n", alignment);
 989         DRM_DEBUG("page_order: %d\n", page_order);
 990         DRM_DEBUG("total:      %d\n", total);
 991
 992         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 993                 return -EINVAL;
 994         if (dev->queue_count)
 995                 return -EBUSY;  /* Not while in use */
 996
 997         spin_lock(&dev->count_lock);
 998         if (dev->buf_use) {
 999                 spin_unlock(&dev->count_lock);
1000                 return -EBUSY;
1001         }
1002         atomic_inc(&dev->buf_alloc);
1003         spin_unlock(&dev->count_lock);
1004
1005         mutex_lock(&dev->struct_mutex);
1006         entry = &dma->bufs[order];
1007         if (entry->buf_count) {
1008                 mutex_unlock(&dev->struct_mutex);
1009                 atomic_dec(&dev->buf_alloc);
1010                 return -ENOMEM; /* May only call once for each order */
1011         }
1012
1013         if (count < 0 || count > 4096) {
1014                 mutex_unlock(&dev->struct_mutex);
1015                 atomic_dec(&dev->buf_alloc);
1016                 return -EINVAL;
1017         }
1018
1019         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1020                                    DRM_MEM_BUFS);
1021         if (!entry->buflist) {
1022                 mutex_unlock(&dev->struct_mutex);
1023                 atomic_dec(&dev->buf_alloc);
1024                 return -ENOMEM;
1025         }
1026         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1027
1028         entry->buf_size = size;
1029         entry->page_order = page_order;
1030
1031         offset = 0;
1032
1033         while (entry->buf_count < count) {
1034                 buf = &entry->buflist[entry->buf_count];
1035                 buf->idx = dma->buf_count + entry->buf_count;
1036                 buf->total = alignment;
1037                 buf->order = order;
1038                 buf->used = 0;
1039
1040                 buf->offset = (dma->byte_count + offset);
1041                 buf->bus_address = agp_offset + offset;
1042                 buf->address = (void *)(agp_offset + offset
1043                                         + (unsigned long)dev->sg->virtual);
1044                 buf->next = NULL;
1045                 buf->waiting = 0;
1046                 buf->pending = 0;
1047                 init_waitqueue_head(&buf->dma_wait);
1048                 buf->file_priv = NULL;
1049
1050                 buf->dev_priv_size = dev->driver->dev_priv_size;
1051                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1052                 if (!buf->dev_private) {
1053                         /* Set count correctly so we free the proper amount. */
1054                         entry->buf_count = count;
1055                         drm_cleanup_buf_error(dev, entry);
1056                         mutex_unlock(&dev->struct_mutex);
1057                         atomic_dec(&dev->buf_alloc);
1058                         return -ENOMEM;
1059                 }
1060
1061                 memset(buf->dev_private, 0, buf->dev_priv_size);
1062
1063                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1064
1065                 offset += alignment;
1066                 entry->buf_count++;
1067                 byte_count += PAGE_SIZE << page_order;
1068         }
1069
1070         DRM_DEBUG("byte_count: %d\n", byte_count);
1071
1072         temp_buflist = drm_realloc(dma->buflist,
1073                                    dma->buf_count * sizeof(*dma->buflist),
1074                                    (dma->buf_count + entry->buf_count)
1075                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1076         if (!temp_buflist) {
1077                 /* Free the entry because it isn't valid */
1078                 drm_cleanup_buf_error(dev, entry);
1079                 mutex_unlock(&dev->struct_mutex);
1080                 atomic_dec(&dev->buf_alloc);
1081                 return -ENOMEM;
1082         }
1083         dma->buflist = temp_buflist;
1084
1085         for (i = 0; i < entry->buf_count; i++) {
1086                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1087         }
1088
1089         dma->buf_count += entry->buf_count;
1090         dma->seg_count += entry->seg_count;
1091         dma->page_count += byte_count >> PAGE_SHIFT;
1092         dma->byte_count += byte_count;
1093
1094         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1095         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1096
1097         mutex_unlock(&dev->struct_mutex);
1098
1099         request->count = entry->buf_count;
1100         request->size = size;
1101
1102         dma->flags = _DRM_DMA_USE_SG;
1103
1104         atomic_dec(&dev->buf_alloc);
1105         return 0;
1106 }
1107
1108 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1109 {
1110         struct drm_device_dma *dma = dev->dma;
1111         struct drm_buf_entry *entry;
1112         struct drm_buf *buf;
1113         unsigned long offset;
1114         unsigned long agp_offset;
1115         int count;
1116         int order;
1117         int size;
1118         int alignment;
1119         int page_order;
1120         int total;
1121         int byte_count;
1122         int i;
1123         struct drm_buf **temp_buflist;
1124
1125         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1126                 return -EINVAL;
1127
1128         if (!dma)
1129                 return -EINVAL;
1130
1131         if (!capable(CAP_SYS_ADMIN))
1132                 return -EPERM;
1133
1134         count = request->count;
1135         order = drm_order(request->size);
1136         size = 1 << order;
1137
1138         alignment = (request->flags & _DRM_PAGE_ALIGN)
1139             ? PAGE_ALIGN(size) : size;
1140         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1141         total = PAGE_SIZE << page_order;
1142
1143         byte_count = 0;
1144         agp_offset = request->agp_start;
1145
1146         DRM_DEBUG("count:      %d\n", count);
1147         DRM_DEBUG("order:      %d\n", order);
1148         DRM_DEBUG("size:       %d\n", size);
1149         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1150         DRM_DEBUG("alignment:  %d\n", alignment);
1151         DRM_DEBUG("page_order: %d\n", page_order);
1152         DRM_DEBUG("total:      %d\n", total);
1153
1154         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1155                 return -EINVAL;
1156         if (dev->queue_count)
1157                 return -EBUSY;  /* Not while in use */
1158
1159         spin_lock(&dev->count_lock);
1160         if (dev->buf_use) {
1161                 spin_unlock(&dev->count_lock);
1162                 return -EBUSY;
1163         }
1164         atomic_inc(&dev->buf_alloc);
1165         spin_unlock(&dev->count_lock);
1166
1167         mutex_lock(&dev->struct_mutex);
1168         entry = &dma->bufs[order];
1169         if (entry->buf_count) {
1170                 mutex_unlock(&dev->struct_mutex);
1171                 atomic_dec(&dev->buf_alloc);
1172                 return -ENOMEM; /* May only call once for each order */
1173         }
1174
1175         if (count < 0 || count > 4096) {
1176                 mutex_unlock(&dev->struct_mutex);
1177                 atomic_dec(&dev->buf_alloc);
1178                 return -EINVAL;
1179         }
1180
1181         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1182                                    DRM_MEM_BUFS);
1183         if (!entry->buflist) {
1184                 mutex_unlock(&dev->struct_mutex);
1185                 atomic_dec(&dev->buf_alloc);
1186                 return -ENOMEM;
1187         }
1188         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1189
1190         entry->buf_size = size;
1191         entry->page_order = page_order;
1192
1193         offset = 0;
1194
1195         while (entry->buf_count < count) {
1196                 buf = &entry->buflist[entry->buf_count];
1197                 buf->idx = dma->buf_count + entry->buf_count;
1198                 buf->total = alignment;
1199                 buf->order = order;
1200                 buf->used = 0;
1201
1202                 buf->offset = (dma->byte_count + offset);
1203                 buf->bus_address = agp_offset + offset;
1204                 buf->address = (void *)(agp_offset + offset);
1205                 buf->next = NULL;
1206                 buf->waiting = 0;
1207                 buf->pending = 0;
1208                 init_waitqueue_head(&buf->dma_wait);
1209                 buf->file_priv = NULL;
1210
1211                 buf->dev_priv_size = dev->driver->dev_priv_size;
1212                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1213                 if (!buf->dev_private) {
1214                         /* Set count correctly so we free the proper amount. */
1215                         entry->buf_count = count;
1216                         drm_cleanup_buf_error(dev, entry);
1217                         mutex_unlock(&dev->struct_mutex);
1218                         atomic_dec(&dev->buf_alloc);
1219                         return -ENOMEM;
1220                 }
1221                 memset(buf->dev_private, 0, buf->dev_priv_size);
1222
1223                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1224
1225                 offset += alignment;
1226                 entry->buf_count++;
1227                 byte_count += PAGE_SIZE << page_order;
1228         }
1229
1230         DRM_DEBUG("byte_count: %d\n", byte_count);
1231
1232         temp_buflist = drm_realloc(dma->buflist,
1233                                    dma->buf_count * sizeof(*dma->buflist),
1234                                    (dma->buf_count + entry->buf_count)
1235                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1236         if (!temp_buflist) {
1237                 /* Free the entry because it isn't valid */
1238                 drm_cleanup_buf_error(dev, entry);
1239                 mutex_unlock(&dev->struct_mutex);
1240                 atomic_dec(&dev->buf_alloc);
1241                 return -ENOMEM;
1242         }
1243         dma->buflist = temp_buflist;
1244
1245         for (i = 0; i < entry->buf_count; i++) {
1246                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1247         }
1248
1249         dma->buf_count += entry->buf_count;
1250         dma->seg_count += entry->seg_count;
1251         dma->page_count += byte_count >> PAGE_SHIFT;
1252         dma->byte_count += byte_count;
1253
1254         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1255         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1256
1257         mutex_unlock(&dev->struct_mutex);
1258
1259         request->count = entry->buf_count;
1260         request->size = size;
1261
1262         dma->flags = _DRM_DMA_USE_FB;
1263
1264         atomic_dec(&dev->buf_alloc);
1265         return 0;
1266 }
1267
1268
1269 /**
1270  * Add buffers for DMA transfers (ioctl).
1271  *
1272  * \param inode device inode.
1273  * \param file_priv DRM file private.
1274  * \param cmd command.
1275  * \param arg pointer to a struct drm_buf_desc request.
1276  * \return zero on success or a negative number on failure.
1277  *
1278  * According with the memory type specified in drm_buf_desc::flags and the
1279  * build options, it dispatches the call either to addbufs_agp(),
1280  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1281  * PCI memory respectively.
1282  */
1283 int drm_addbufs(struct inode *inode, struct drm_file *file_priv,
1284                 unsigned int cmd, unsigned long arg)
1285 {
1286         struct drm_buf_desc request;
1287         struct drm_device *dev = file_priv->head->dev;
1288         int ret;
1289
1290         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1291                 return -EINVAL;
1292
1293         if (copy_from_user(&request, (struct drm_buf_desc __user *) arg,
1294                            sizeof(request)))
1295                 return -EFAULT;
1296
1297 #if __OS_HAS_AGP
1298         if (request.flags & _DRM_AGP_BUFFER)
1299                 ret = drm_addbufs_agp(dev, &request);
1300         else
1301 #endif
1302         if (request.flags & _DRM_SG_BUFFER)
1303                 ret = drm_addbufs_sg(dev, &request);
1304         else if (request.flags & _DRM_FB_BUFFER)
1305                 ret = drm_addbufs_fb(dev, &request);
1306         else
1307                 ret = drm_addbufs_pci(dev, &request);
1308
1309         if (ret == 0) {
1310                 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1311                         ret = -EFAULT;
1312                 }
1313         }
1314         return ret;
1315 }
1316
1317 /**
1318  * Get information about the buffer mappings.
1319  *
1320  * This was originally mean for debugging purposes, or by a sophisticated
1321  * client library to determine how best to use the available buffers (e.g.,
1322  * large buffers can be used for image transfer).
1323  *
1324  * \param inode device inode.
1325  * \param file_priv DRM file private.
1326  * \param cmd command.
1327  * \param arg pointer to a drm_buf_info structure.
1328  * \return zero on success or a negative number on failure.
1329  *
1330  * Increments drm_device::buf_use while holding the drm_device::count_lock
1331  * lock, preventing of allocating more buffers after this call. Information
1332  * about each requested buffer is then copied into user space.
1333  */
1334 int drm_infobufs(struct inode *inode, struct drm_file *file_priv,
1335                  unsigned int cmd, unsigned long arg)
1336 {
1337         struct drm_device *dev = file_priv->head->dev;
1338         struct drm_device_dma *dma = dev->dma;
1339         struct drm_buf_info request;
1340         struct drm_buf_info __user *argp = (void __user *)arg;
1341         int i;
1342         int count;
1343
1344         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1345                 return -EINVAL;
1346
1347         if (!dma)
1348                 return -EINVAL;
1349
1350         spin_lock(&dev->count_lock);
1351         if (atomic_read(&dev->buf_alloc)) {
1352                 spin_unlock(&dev->count_lock);
1353                 return -EBUSY;
1354         }
1355         ++dev->buf_use;         /* Can't allocate more after this call */
1356         spin_unlock(&dev->count_lock);
1357
1358         if (copy_from_user(&request, argp, sizeof(request)))
1359                 return -EFAULT;
1360
1361         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1362                 if (dma->bufs[i].buf_count)
1363                         ++count;
1364         }
1365
1366         DRM_DEBUG("count = %d\n", count);
1367
1368         if (request.count >= count) {
1369                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1370                         if (dma->bufs[i].buf_count) {
1371                                 struct drm_buf_desc __user *to =
1372                                     &request.list[count];
1373                                 struct drm_buf_entry *from = &dma->bufs[i];
1374                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1375                                 if (copy_to_user(&to->count,
1376                                                  &from->buf_count,
1377                                                  sizeof(from->buf_count)) ||
1378                                     copy_to_user(&to->size,
1379                                                  &from->buf_size,
1380                                                  sizeof(from->buf_size)) ||
1381                                     copy_to_user(&to->low_mark,
1382                                                  &list->low_mark,
1383                                                  sizeof(list->low_mark)) ||
1384                                     copy_to_user(&to->high_mark,
1385                                                  &list->high_mark,
1386                                                  sizeof(list->high_mark)))
1387                                         return -EFAULT;
1388
1389                                 DRM_DEBUG("%d %d %d %d %d\n",
1390                                           i,
1391                                           dma->bufs[i].buf_count,
1392                                           dma->bufs[i].buf_size,
1393                                           dma->bufs[i].freelist.low_mark,
1394                                           dma->bufs[i].freelist.high_mark);
1395                                 ++count;
1396                         }
1397                 }
1398         }
1399         request.count = count;
1400
1401         if (copy_to_user(argp, &request, sizeof(request)))
1402                 return -EFAULT;
1403
1404         return 0;
1405 }
1406
1407 /**
1408  * Specifies a low and high water mark for buffer allocation
1409  *
1410  * \param inode device inode.
1411  * \param file_priv DRM file private.
1412  * \param cmd command.
1413  * \param arg a pointer to a drm_buf_desc structure.
1414  * \return zero on success or a negative number on failure.
1415  *
1416  * Verifies that the size order is bounded between the admissible orders and
1417  * updates the respective drm_device_dma::bufs entry low and high water mark.
1418  *
1419  * \note This ioctl is deprecated and mostly never used.
1420  */
1421 int drm_markbufs(struct inode *inode, struct drm_file *file_priv,
1422                  unsigned int cmd, unsigned long arg)
1423 {
1424         struct drm_device *dev = file_priv->head->dev;
1425         struct drm_device_dma *dma = dev->dma;
1426         struct drm_buf_desc request;
1427         int order;
1428         struct drm_buf_entry *entry;
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                            (struct drm_buf_desc __user *) arg, sizeof(request)))
1438                 return -EFAULT;
1439
1440         DRM_DEBUG("%d, %d, %d\n",
1441                   request.size, request.low_mark, request.high_mark);
1442         order = drm_order(request.size);
1443         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1444                 return -EINVAL;
1445         entry = &dma->bufs[order];
1446
1447         if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1448                 return -EINVAL;
1449         if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1450                 return -EINVAL;
1451
1452         entry->freelist.low_mark = request.low_mark;
1453         entry->freelist.high_mark = request.high_mark;
1454
1455         return 0;
1456 }
1457
1458 /**
1459  * Unreserve the buffers in list, previously reserved using drmDMA.
1460  *
1461  * \param inode device inode.
1462  * \param file_priv DRM file private.
1463  * \param cmd command.
1464  * \param arg pointer to a drm_buf_free structure.
1465  * \return zero on success or a negative number on failure.
1466  *
1467  * Calls free_buffer() for each used buffer.
1468  * This function is primarily used for debugging.
1469  */
1470 int drm_freebufs(struct inode *inode, struct drm_file *file_priv,
1471                  unsigned int cmd, unsigned long arg)
1472 {
1473         struct drm_device *dev = file_priv->head->dev;
1474         struct drm_device_dma *dma = dev->dma;
1475         struct drm_buf_free request;
1476         int i;
1477         int idx;
1478         struct drm_buf *buf;
1479
1480         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1481                 return -EINVAL;
1482
1483         if (!dma)
1484                 return -EINVAL;
1485
1486         if (copy_from_user(&request,
1487                            (struct drm_buf_free __user *) arg, sizeof(request)))
1488                 return -EFAULT;
1489
1490         DRM_DEBUG("%d\n", request.count);
1491         for (i = 0; i < request.count; i++) {
1492                 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1493                         return -EFAULT;
1494                 if (idx < 0 || idx >= dma->buf_count) {
1495                         DRM_ERROR("Index %d (of %d max)\n",
1496                                   idx, dma->buf_count - 1);
1497                         return -EINVAL;
1498                 }
1499                 buf = dma->buflist[idx];
1500                 if (buf->file_priv != file_priv) {
1501                         DRM_ERROR("Process %d freeing buffer not owned\n",
1502                                   current->pid);
1503                         return -EINVAL;
1504                 }
1505                 drm_free_buffer(dev, buf);
1506         }
1507
1508         return 0;
1509 }
1510
1511 /**
1512  * Maps all of the DMA buffers into client-virtual space (ioctl).
1513  *
1514  * \param inode device inode.
1515  * \param file_priv DRM file private.
1516  * \param cmd command.
1517  * \param arg pointer to a drm_buf_map structure.
1518  * \return zero on success or a negative number on failure.
1519  *
1520  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1521  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1522  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1523  * drm_mmap_dma().
1524  */
1525 int drm_mapbufs(struct inode *inode, struct drm_file *file_priv,
1526                 unsigned int cmd, unsigned long arg)
1527 {
1528         struct drm_device *dev = file_priv->head->dev;
1529         struct drm_device_dma *dma = dev->dma;
1530         struct drm_buf_map __user *argp = (void __user *)arg;
1531         int retcode = 0;
1532         const int zero = 0;
1533         unsigned long virtual;
1534         unsigned long address;
1535         struct drm_buf_map request;
1536         int i;
1537
1538         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1539                 return -EINVAL;
1540
1541         if (!dma)
1542                 return -EINVAL;
1543
1544         spin_lock(&dev->count_lock);
1545         if (atomic_read(&dev->buf_alloc)) {
1546                 spin_unlock(&dev->count_lock);
1547                 return -EBUSY;
1548         }
1549         dev->buf_use++;         /* Can't allocate more after this call */
1550         spin_unlock(&dev->count_lock);
1551
1552         if (copy_from_user(&request, argp, sizeof(request)))
1553                 return -EFAULT;
1554
1555         if (request.count >= dma->buf_count) {
1556                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1557                     || (drm_core_check_feature(dev, DRIVER_SG)
1558                         && (dma->flags & _DRM_DMA_USE_SG))
1559                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1560                         && (dma->flags & _DRM_DMA_USE_FB))) {
1561                         struct drm_map *map = dev->agp_buffer_map;
1562                         unsigned long token = dev->agp_buffer_token;
1563
1564                         if (!map) {
1565                                 retcode = -EINVAL;
1566                                 goto done;
1567                         }
1568
1569                         down_write(&current->mm->mmap_sem);
1570                         virtual = do_mmap(file_priv->filp, 0, map->size,
1571                                           PROT_READ | PROT_WRITE,
1572                                           MAP_SHARED, token);
1573                         up_write(&current->mm->mmap_sem);
1574                 } else {
1575                         down_write(&current->mm->mmap_sem);
1576                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1577                                           PROT_READ | PROT_WRITE,
1578                                           MAP_SHARED, 0);
1579                         up_write(&current->mm->mmap_sem);
1580                 }
1581                 if (virtual > -1024UL) {
1582                         /* Real error */
1583                         retcode = (signed long)virtual;
1584                         goto done;
1585                 }
1586                 request.virtual = (void __user *)virtual;
1587
1588                 for (i = 0; i < dma->buf_count; i++) {
1589                         if (copy_to_user(&request.list[i].idx,
1590                                          &dma->buflist[i]->idx,
1591                                          sizeof(request.list[0].idx))) {
1592                                 retcode = -EFAULT;
1593                                 goto done;
1594                         }
1595                         if (copy_to_user(&request.list[i].total,
1596                                          &dma->buflist[i]->total,
1597                                          sizeof(request.list[0].total))) {
1598                                 retcode = -EFAULT;
1599                                 goto done;
1600                         }
1601                         if (copy_to_user(&request.list[i].used,
1602                                          &zero, sizeof(zero))) {
1603                                 retcode = -EFAULT;
1604                                 goto done;
1605                         }
1606                         address = virtual + dma->buflist[i]->offset;    /* *** */
1607                         if (copy_to_user(&request.list[i].address,
1608                                          &address, sizeof(address))) {
1609                                 retcode = -EFAULT;
1610                                 goto done;
1611                         }
1612                 }
1613         }
1614       done:
1615         request.count = dma->buf_count;
1616         DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1617
1618         if (copy_to_user(argp, &request, sizeof(request)))
1619                 return -EFAULT;
1620
1621         return retcode;
1622 }
1623
1624 /**
1625  * Compute size order.  Returns the exponent of the smaller power of two which
1626  * is greater or equal to given number.
1627  *
1628  * \param size size.
1629  * \return order.
1630  *
1631  * \todo Can be made faster.
1632  */
1633 int drm_order(unsigned long size)
1634 {
1635         int order;
1636         unsigned long tmp;
1637
1638         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1639
1640         if (size & (size - 1))
1641                 ++order;
1642
1643         return order;
1644 }
1645 EXPORT_SYMBOL(drm_order);
1646
1647