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(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 EXPORT_SYMBOL(drm_get_resource_len);
  50
  51 struct drm_map_list *drm_find_matching_map(struct drm_device *dev, drm_local_map_t *map)
  52 {
  53         struct drm_map_list *entry;
  54         list_for_each_entry(entry, &dev->maplist, head) {
  55                 if (entry->map && map->type == entry->map->type &&
  56                     ((entry->map->offset == map->offset) ||
  57                      (map->type == _DRM_SHM && map->flags==_DRM_CONTAINS_LOCK))) {
  58                         return entry;
  59                 }
  60         }
  61
  62         return NULL;
  63 }
  64 EXPORT_SYMBOL(drm_find_matching_map);
  65
  66 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  67                           unsigned long user_token, int hashed_handle)
  68 {
  69         int use_hashed_handle;
  70
  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                 break;
 188         case _DRM_SHM:
 189                 list = drm_find_matching_map(dev, map);
 190                 if (list != NULL) {
 191                         if(list->map->size != map->size) {
 192                                 DRM_DEBUG("Matching maps of type %d with "
 193                                    "mismatched sizes, (%ld vs %ld)\n",
 194                                     map->type, map->size, list->map->size);
 195                                 list->map->size = map->size;
 196                         }
 197
 198                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 199                         *maplist = list;
 200                         return 0;
 201                 }
 202                 map->handle = vmalloc_user(map->size);
 203                 DRM_DEBUG("%lu %d %p\n",
 204                           map->size, drm_order(map->size), map->handle);
 205                 if (!map->handle) {
 206                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 207                         return -ENOMEM;
 208                 }
 209                 map->offset = (unsigned long)map->handle;
 210                 if (map->flags & _DRM_CONTAINS_LOCK) {
 211                         /* Prevent a 2nd X Server from creating a 2nd lock */
 212                         if (dev->lock.hw_lock != NULL) {
 213                                 vfree(map->handle);
 214                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 215                                 return -EBUSY;
 216                         }
 217                         dev->sigdata.lock = dev->lock.hw_lock = map->handle;    /* Pointer to lock */
 218                 }
 219                 break;
 220         case _DRM_AGP: {
 221                 struct drm_agp_mem *entry;
 222                 int valid = 0;
 223
 224                 if (!drm_core_has_AGP(dev)) {
 225                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 226                         return -EINVAL;
 227                 }
 228 #ifdef __alpha__
 229                 map->offset += dev->hose->mem_space->start;
 230 #endif
 231                 /* In some cases (i810 driver), user space may have already
 232                  * added the AGP base itself, because dev->agp->base previously
 233                  * only got set during AGP enable.  So, only add the base
 234                  * address if the map's offset isn't already within the
 235                  * aperture.
 236                  */
 237                 if (map->offset < dev->agp->base ||
 238                     map->offset > dev->agp->base +
 239                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 240                         map->offset += dev->agp->base;
 241                 }
 242                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 243
 244                 /* This assumes the DRM is in total control of AGP space.
 245                  * It's not always the case as AGP can be in the control
 246                  * of user space (i.e. i810 driver). So this loop will get
 247                  * skipped and we double check that dev->agp->memory is
 248                  * actually set as well as being invalid before EPERM'ing
 249                  */
 250                 list_for_each_entry(entry, &dev->agp->memory, head) {
 251                         if ((map->offset >= entry->bound) &&
 252                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 253                                 valid = 1;
 254                                 break;
 255                         }
 256                 }
 257                 if (!list_empty(&dev->agp->memory) && !valid) {
 258                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 259                         return -EPERM;
 260                 }
 261                 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
 262                 break;
 263         }
 264         case _DRM_SCATTER_GATHER:
 265                 if (!dev->sg) {
 266                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 267                         return -EINVAL;
 268                 }
 269                 map->offset += (unsigned long)dev->sg->virtual;
 270                 break;
 271         case _DRM_CONSISTENT:
 272                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 273                  * As we're limiting the address to 2^32-1 (or less),
 274                  * casting it down to 32 bits is no problem, but we
 275                  * need to point to a 64bit variable first. */
 276                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 277                 if (!dmah) {
 278                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 279                         return -ENOMEM;
 280                 }
 281                 map->handle = dmah->vaddr;
 282                 map->offset = (unsigned long)dmah->busaddr;
 283                 kfree(dmah);
 284                 break;
 285         default:
 286                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 287                 return -EINVAL;
 288         }
 289
 290         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 291         if (!list) {
 292                 if (map->type == _DRM_REGISTERS)
 293                         iounmap(map->handle);
 294                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 295                 return -EINVAL;
 296         }
 297         memset(list, 0, sizeof(*list));
 298         list->map = map;
 299
 300         mutex_lock(&dev->struct_mutex);
 301         list_add(&list->head, &dev->maplist);
 302
 303         /* Assign a 32-bit handle */
 304
 305         user_token = (map->type == _DRM_SHM) ? (unsigned long) map->handle :
 306                 map->offset;
 307         ret = drm_map_handle(dev, &list->hash, user_token, 0);
 308
 309         if (ret) {
 310                 if (map->type == _DRM_REGISTERS)
 311                         iounmap(map->handle);
 312                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 313                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 314                 mutex_unlock(&dev->struct_mutex);
 315                 return ret;
 316         }
 317
 318         list->user_token = list->hash.key << PAGE_SHIFT;
 319         mutex_unlock(&dev->struct_mutex);
 320
 321         *maplist = list;
 322         return 0;
 323 }
 324
 325 int drm_addmap(struct drm_device *dev, unsigned int offset,
 326                unsigned int size, enum drm_map_type type,
 327                enum drm_map_flags flags, drm_local_map_t ** map_ptr)
 328 {
 329         struct drm_map_list *list;
 330         int rc;
 331
 332         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 333         if (!rc)
 334                 *map_ptr = list->map;
 335         return rc;
 336 }
 337
 338 EXPORT_SYMBOL(drm_addmap);
 339
 340 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 341                      struct drm_file *file_priv)
 342 {
 343         struct drm_map *map = data;
 344         struct drm_map_list *maplist;
 345         int err;
 346
 347         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP))
 348                 return -EPERM;
 349
 350         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 351                               map->flags, &maplist);
 352
 353         if (err)
 354                 return err;
 355
 356         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 357         map->handle = (void *)(unsigned long)maplist->user_token;
 358         return 0;
 359 }
 360
 361 /**
 362  * Remove a map private from list and deallocate resources if the mapping
 363  * isn't in use.
 364  *
 365  * \param inode device inode.
 366  * \param file_priv DRM file private.
 367  * \param cmd command.
 368  * \param arg pointer to a struct drm_map structure.
 369  * \return zero on success or a negative value on error.
 370  *
 371  * Searches the map on drm_device::maplist, removes it from the list, see if
 372  * its being used, and free any associate resource (such as MTRR's) if it's not
 373  * being on use.
 374  *
 375  * \sa drm_addmap
 376  */
 377 int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
 378 {
 379         struct drm_map_list *r_list = NULL, *list_t;
 380         drm_dma_handle_t dmah;
 381         int found = 0;
 382
 383         /* Find the list entry for the map and remove it */
 384         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 385                 if (r_list->map == map) {
 386                         list_del(&r_list->head);
 387                         drm_ht_remove_key(&dev->map_hash,
 388                                           r_list->user_token >> PAGE_SHIFT);
 389                         drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
 390                         found = 1;
 391                         break;
 392                 }
 393         }
 394
 395         if (!found)
 396                 return -EINVAL;
 397
 398         /* List has wrapped around to the head pointer, or it's empty and we
 399          * didn't find anything.
 400          */
 401
 402         switch (map->type) {
 403         case _DRM_REGISTERS:
 404                 iounmap(map->handle);
 405                 /* FALLTHROUGH */
 406         case _DRM_FRAME_BUFFER:
 407                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 408                         int retcode;
 409                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 410                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 411                 }
 412                 break;
 413         case _DRM_SHM:
 414                 vfree(map->handle);
 415                 break;
 416         case _DRM_AGP:
 417         case _DRM_SCATTER_GATHER:
 418                 break;
 419         case _DRM_CONSISTENT:
 420                 dmah.vaddr = map->handle;
 421                 dmah.busaddr = map->offset;
 422                 dmah.size = map->size;
 423                 __drm_pci_free(dev, &dmah);
 424                 break;
 425         case _DRM_TTM:
 426                 BUG_ON(1);
 427         }
 428         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 429
 430         return 0;
 431 }
 432 EXPORT_SYMBOL(drm_rmmap_locked);
 433
 434 int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
 435 {
 436         int ret;
 437
 438         mutex_lock(&dev->struct_mutex);
 439         ret = drm_rmmap_locked(dev, map);
 440         mutex_unlock(&dev->struct_mutex);
 441
 442         return ret;
 443 }
 444 EXPORT_SYMBOL(drm_rmmap);
 445
 446 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 447  * the last close of the device, and this is necessary for cleanup when things
 448  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 449  * like a pointless exercise since they're going away anyway.
 450  *
 451  * One use case might be after addmap is allowed for normal users for SHM and
 452  * gets used by drivers that the server doesn't need to care about.  This seems
 453  * unlikely.
 454  */
 455 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 456                     struct drm_file *file_priv)
 457 {
 458         struct drm_map *request = data;
 459         drm_local_map_t *map = NULL;
 460         struct drm_map_list *r_list;
 461         int ret;
 462
 463         mutex_lock(&dev->struct_mutex);
 464         list_for_each_entry(r_list, &dev->maplist, head) {
 465                 if (r_list->map &&
 466                     r_list->user_token == (unsigned long)request->handle &&
 467                     r_list->map->flags & _DRM_REMOVABLE) {
 468                         map = r_list->map;
 469                         break;
 470                 }
 471         }
 472
 473         /* List has wrapped around to the head pointer, or its empty we didn't
 474          * find anything.
 475          */
 476         if (list_empty(&dev->maplist) || !map) {
 477                 mutex_unlock(&dev->struct_mutex);
 478                 return -EINVAL;
 479         }
 480
 481         /* Register and framebuffer maps are permanent */
 482         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 483                 mutex_unlock(&dev->struct_mutex);
 484                 return 0;
 485         }
 486
 487         ret = drm_rmmap_locked(dev, map);
 488
 489         mutex_unlock(&dev->struct_mutex);
 490
 491         return ret;
 492 }
 493
 494 /**
 495  * Cleanup after an error on one of the addbufs() functions.
 496  *
 497  * \param dev DRM device.
 498  * \param entry buffer entry where the error occurred.
 499  *
 500  * Frees any pages and buffers associated with the given entry.
 501  */
 502 static void drm_cleanup_buf_error(struct drm_device *dev,
 503                                   struct drm_buf_entry *entry)
 504 {
 505         int i;
 506
 507         if (entry->seg_count) {
 508                 for (i = 0; i < entry->seg_count; i++) {
 509                         if (entry->seglist[i]) {
 510                                 drm_pci_free(dev, entry->seglist[i]);
 511                         }
 512                 }
 513                 drm_free(entry->seglist,
 514                          entry->seg_count *
 515                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 516
 517                 entry->seg_count = 0;
 518         }
 519
 520         if (entry->buf_count) {
 521                 for (i = 0; i < entry->buf_count; i++) {
 522                         if (entry->buflist[i].dev_private) {
 523                                 drm_free(entry->buflist[i].dev_private,
 524                                          entry->buflist[i].dev_priv_size,
 525                                          DRM_MEM_BUFS);
 526                         }
 527                 }
 528                 drm_free(entry->buflist,
 529                          entry->buf_count *
 530                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 531
 532                 entry->buf_count = 0;
 533         }
 534 }
 535
 536 #if __OS_HAS_AGP
 537 /**
 538  * Add AGP buffers for DMA transfers.
 539  *
 540  * \param dev struct drm_device to which the buffers are to be added.
 541  * \param request pointer to a struct drm_buf_desc describing the request.
 542  * \return zero on success or a negative number on failure.
 543  *
 544  * After some sanity checks creates a drm_buf structure for each buffer and
 545  * reallocates the buffer list of the same size order to accommodate the new
 546  * buffers.
 547  */
 548 int drm_addbufs_agp(struct drm_device *dev, struct drm_buf_desc *request)
 549 {
 550         struct drm_device_dma *dma = dev->dma;
 551         struct drm_buf_entry *entry;
 552         struct drm_agp_mem *agp_entry;
 553         struct drm_buf *buf;
 554         unsigned long offset;
 555         unsigned long agp_offset;
 556         int count;
 557         int order;
 558         int size;
 559         int alignment;
 560         int page_order;
 561         int total;
 562         int byte_count;
 563         int i, valid;
 564         struct drm_buf **temp_buflist;
 565
 566         if (!dma)
 567                 return -EINVAL;
 568
 569         count = request->count;
 570         order = drm_order(request->size);
 571         size = 1 << order;
 572
 573         alignment = (request->flags & _DRM_PAGE_ALIGN)
 574             ? PAGE_ALIGN(size) : size;
 575         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 576         total = PAGE_SIZE << page_order;
 577
 578         byte_count = 0;
 579         agp_offset = dev->agp->base + request->agp_start;
 580
 581         DRM_DEBUG("count:      %d\n", count);
 582         DRM_DEBUG("order:      %d\n", order);
 583         DRM_DEBUG("size:       %d\n", size);
 584         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 585         DRM_DEBUG("alignment:  %d\n", alignment);
 586         DRM_DEBUG("page_order: %d\n", page_order);
 587         DRM_DEBUG("total:      %d\n", total);
 588
 589         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 590                 return -EINVAL;
 591         if (dev->queue_count)
 592                 return -EBUSY;  /* Not while in use */
 593
 594         /* Make sure buffers are located in AGP memory that we own */
 595         valid = 0;
 596         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 597                 if ((agp_offset >= agp_entry->bound) &&
 598                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 599                         valid = 1;
 600                         break;
 601                 }
 602         }
 603         if (!list_empty(&dev->agp->memory) && !valid) {
 604                 DRM_DEBUG("zone invalid\n");
 605                 return -EINVAL;
 606         }
 607         spin_lock(&dev->count_lock);
 608         if (dev->buf_use) {
 609                 spin_unlock(&dev->count_lock);
 610                 return -EBUSY;
 611         }
 612         atomic_inc(&dev->buf_alloc);
 613         spin_unlock(&dev->count_lock);
 614
 615         mutex_lock(&dev->struct_mutex);
 616         entry = &dma->bufs[order];
 617         if (entry->buf_count) {
 618                 mutex_unlock(&dev->struct_mutex);
 619                 atomic_dec(&dev->buf_alloc);
 620                 return -ENOMEM; /* May only call once for each order */
 621         }
 622
 623         if (count < 0 || count > 4096) {
 624                 mutex_unlock(&dev->struct_mutex);
 625                 atomic_dec(&dev->buf_alloc);
 626                 return -EINVAL;
 627         }
 628
 629         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 630                                    DRM_MEM_BUFS);
 631         if (!entry->buflist) {
 632                 mutex_unlock(&dev->struct_mutex);
 633                 atomic_dec(&dev->buf_alloc);
 634                 return -ENOMEM;
 635         }
 636         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 637
 638         entry->buf_size = size;
 639         entry->page_order = page_order;
 640
 641         offset = 0;
 642
 643         while (entry->buf_count < count) {
 644                 buf = &entry->buflist[entry->buf_count];
 645                 buf->idx = dma->buf_count + entry->buf_count;
 646                 buf->total = alignment;
 647                 buf->order = order;
 648                 buf->used = 0;
 649
 650                 buf->offset = (dma->byte_count + offset);
 651                 buf->bus_address = agp_offset + offset;
 652                 buf->address = (void *)(agp_offset + offset);
 653                 buf->next = NULL;
 654                 buf->waiting = 0;
 655                 buf->pending = 0;
 656                 init_waitqueue_head(&buf->dma_wait);
 657                 buf->file_priv = NULL;
 658
 659                 buf->dev_priv_size = dev->driver->dev_priv_size;
 660                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 661                 if (!buf->dev_private) {
 662                         /* Set count correctly so we free the proper amount. */
 663                         entry->buf_count = count;
 664                         drm_cleanup_buf_error(dev, entry);
 665                         mutex_unlock(&dev->struct_mutex);
 666                         atomic_dec(&dev->buf_alloc);
 667                         return -ENOMEM;
 668                 }
 669                 memset(buf->dev_private, 0, buf->dev_priv_size);
 670
 671                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 672
 673                 offset += alignment;
 674                 entry->buf_count++;
 675                 byte_count += PAGE_SIZE << page_order;
 676         }
 677
 678         DRM_DEBUG("byte_count: %d\n", byte_count);
 679
 680         temp_buflist = drm_realloc(dma->buflist,
 681                                    dma->buf_count * sizeof(*dma->buflist),
 682                                    (dma->buf_count + entry->buf_count)
 683                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 684         if (!temp_buflist) {
 685                 /* Free the entry because it isn't valid */
 686                 drm_cleanup_buf_error(dev, entry);
 687                 mutex_unlock(&dev->struct_mutex);
 688                 atomic_dec(&dev->buf_alloc);
 689                 return -ENOMEM;
 690         }
 691         dma->buflist = temp_buflist;
 692
 693         for (i = 0; i < entry->buf_count; i++) {
 694                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 695         }
 696
 697         dma->buf_count += entry->buf_count;
 698         dma->seg_count += entry->seg_count;
 699         dma->page_count += byte_count >> PAGE_SHIFT;
 700         dma->byte_count += byte_count;
 701
 702         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 703         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 704
 705         mutex_unlock(&dev->struct_mutex);
 706
 707         request->count = entry->buf_count;
 708         request->size = size;
 709
 710         dma->flags = _DRM_DMA_USE_AGP;
 711
 712         atomic_dec(&dev->buf_alloc);
 713         return 0;
 714 }
 715 EXPORT_SYMBOL(drm_addbufs_agp);
 716 #endif                          /* __OS_HAS_AGP */
 717
 718 int drm_addbufs_pci(struct drm_device *dev, struct drm_buf_desc *request)
 719 {
 720         struct drm_device_dma *dma = dev->dma;
 721         int count;
 722         int order;
 723         int size;
 724         int total;
 725         int page_order;
 726         struct drm_buf_entry *entry;
 727         drm_dma_handle_t *dmah;
 728         struct drm_buf *buf;
 729         int alignment;
 730         unsigned long offset;
 731         int i;
 732         int byte_count;
 733         int page_count;
 734         unsigned long *temp_pagelist;
 735         struct drm_buf **temp_buflist;
 736
 737         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 738                 return -EINVAL;
 739
 740         if (!dma)
 741                 return -EINVAL;
 742
 743         if (!capable(CAP_SYS_ADMIN))
 744                 return -EPERM;
 745
 746         count = request->count;
 747         order = drm_order(request->size);
 748         size = 1 << order;
 749
 750         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 751                   request->count, request->size, size, order, dev->queue_count);
 752
 753         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 754                 return -EINVAL;
 755         if (dev->queue_count)
 756                 return -EBUSY;  /* Not while in use */
 757
 758         alignment = (request->flags & _DRM_PAGE_ALIGN)
 759             ? PAGE_ALIGN(size) : size;
 760         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 761         total = PAGE_SIZE << page_order;
 762
 763         spin_lock(&dev->count_lock);
 764         if (dev->buf_use) {
 765                 spin_unlock(&dev->count_lock);
 766                 return -EBUSY;
 767         }
 768         atomic_inc(&dev->buf_alloc);
 769         spin_unlock(&dev->count_lock);
 770
 771         mutex_lock(&dev->struct_mutex);
 772         entry = &dma->bufs[order];
 773         if (entry->buf_count) {
 774                 mutex_unlock(&dev->struct_mutex);
 775                 atomic_dec(&dev->buf_alloc);
 776                 return -ENOMEM; /* May only call once for each order */
 777         }
 778
 779         if (count < 0 || count > 4096) {
 780                 mutex_unlock(&dev->struct_mutex);
 781                 atomic_dec(&dev->buf_alloc);
 782                 return -EINVAL;
 783         }
 784
 785         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 786                                    DRM_MEM_BUFS);
 787         if (!entry->buflist) {
 788                 mutex_unlock(&dev->struct_mutex);
 789                 atomic_dec(&dev->buf_alloc);
 790                 return -ENOMEM;
 791         }
 792         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 793
 794         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 795                                    DRM_MEM_SEGS);
 796         if (!entry->seglist) {
 797                 drm_free(entry->buflist,
 798                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 799                 mutex_unlock(&dev->struct_mutex);
 800                 atomic_dec(&dev->buf_alloc);
 801                 return -ENOMEM;
 802         }
 803         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 804
 805         /* Keep the original pagelist until we know all the allocations
 806          * have succeeded
 807          */
 808         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 809                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 810         if (!temp_pagelist) {
 811                 drm_free(entry->buflist,
 812                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 813                 drm_free(entry->seglist,
 814                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 815                 mutex_unlock(&dev->struct_mutex);
 816                 atomic_dec(&dev->buf_alloc);
 817                 return -ENOMEM;
 818         }
 819         memcpy(temp_pagelist,
 820                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 821         DRM_DEBUG("pagelist: %d entries\n",
 822                   dma->page_count + (count << page_order));
 823
 824         entry->buf_size = size;
 825         entry->page_order = page_order;
 826         byte_count = 0;
 827         page_count = 0;
 828
 829         while (entry->buf_count < count) {
 830
 831                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 832
 833                 if (!dmah) {
 834                         /* Set count correctly so we free the proper amount. */
 835                         entry->buf_count = count;
 836                         entry->seg_count = count;
 837                         drm_cleanup_buf_error(dev, entry);
 838                         drm_free(temp_pagelist,
 839                                  (dma->page_count + (count << page_order))
 840                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 841                         mutex_unlock(&dev->struct_mutex);
 842                         atomic_dec(&dev->buf_alloc);
 843                         return -ENOMEM;
 844                 }
 845                 entry->seglist[entry->seg_count++] = dmah;
 846                 for (i = 0; i < (1 << page_order); i++) {
 847                         DRM_DEBUG("page %d @ 0x%08lx\n",
 848                                   dma->page_count + page_count,
 849                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 850                         temp_pagelist[dma->page_count + page_count++]
 851                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 852                 }
 853                 for (offset = 0;
 854                      offset + size <= total && entry->buf_count < count;
 855                      offset += alignment, ++entry->buf_count) {
 856                         buf = &entry->buflist[entry->buf_count];
 857                         buf->idx = dma->buf_count + entry->buf_count;
 858                         buf->total = alignment;
 859                         buf->order = order;
 860                         buf->used = 0;
 861                         buf->offset = (dma->byte_count + byte_count + offset);
 862                         buf->address = (void *)(dmah->vaddr + offset);
 863                         buf->bus_address = dmah->busaddr + offset;
 864                         buf->next = NULL;
 865                         buf->waiting = 0;
 866                         buf->pending = 0;
 867                         init_waitqueue_head(&buf->dma_wait);
 868                         buf->file_priv = NULL;
 869
 870                         buf->dev_priv_size = dev->driver->dev_priv_size;
 871                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 872                                                      DRM_MEM_BUFS);
 873                         if (!buf->dev_private) {
 874                                 /* Set count correctly so we free the proper amount. */
 875                                 entry->buf_count = count;
 876                                 entry->seg_count = count;
 877                                 drm_cleanup_buf_error(dev, entry);
 878                                 drm_free(temp_pagelist,
 879                                          (dma->page_count +
 880                                           (count << page_order))
 881                                          * sizeof(*dma->pagelist),
 882                                          DRM_MEM_PAGES);
 883                                 mutex_unlock(&dev->struct_mutex);
 884                                 atomic_dec(&dev->buf_alloc);
 885                                 return -ENOMEM;
 886                         }
 887                         memset(buf->dev_private, 0, buf->dev_priv_size);
 888
 889                         DRM_DEBUG("buffer %d @ %p\n",
 890                                   entry->buf_count, buf->address);
 891                 }
 892                 byte_count += PAGE_SIZE << page_order;
 893         }
 894
 895         temp_buflist = drm_realloc(dma->buflist,
 896                                    dma->buf_count * sizeof(*dma->buflist),
 897                                    (dma->buf_count + entry->buf_count)
 898                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 899         if (!temp_buflist) {
 900                 /* Free the entry because it isn't valid */
 901                 drm_cleanup_buf_error(dev, entry);
 902                 drm_free(temp_pagelist,
 903                          (dma->page_count + (count << page_order))
 904                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 905                 mutex_unlock(&dev->struct_mutex);
 906                 atomic_dec(&dev->buf_alloc);
 907                 return -ENOMEM;
 908         }
 909         dma->buflist = temp_buflist;
 910
 911         for (i = 0; i < entry->buf_count; i++) {
 912                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 913         }
 914
 915         /* No allocations failed, so now we can replace the orginal pagelist
 916          * with the new one.
 917          */
 918         if (dma->page_count) {
 919                 drm_free(dma->pagelist,
 920                          dma->page_count * sizeof(*dma->pagelist),
 921                          DRM_MEM_PAGES);
 922         }
 923         dma->pagelist = temp_pagelist;
 924
 925         dma->buf_count += entry->buf_count;
 926         dma->seg_count += entry->seg_count;
 927         dma->page_count += entry->seg_count << page_order;
 928         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 929
 930         mutex_unlock(&dev->struct_mutex);
 931
 932         request->count = entry->buf_count;
 933         request->size = size;
 934
 935         if (request->flags & _DRM_PCI_BUFFER_RO)
 936                 dma->flags = _DRM_DMA_USE_PCI_RO;
 937
 938         atomic_dec(&dev->buf_alloc);
 939         return 0;
 940
 941 }
 942 EXPORT_SYMBOL(drm_addbufs_pci);
 943
 944 static int drm_addbufs_sg(struct drm_device *dev, struct drm_buf_desc *request)
 945 {
 946         struct drm_device_dma *dma = dev->dma;
 947         struct drm_buf_entry *entry;
 948         struct drm_buf *buf;
 949         unsigned long offset;
 950         unsigned long agp_offset;
 951         int count;
 952         int order;
 953         int size;
 954         int alignment;
 955         int page_order;
 956         int total;
 957         int byte_count;
 958         int i;
 959         struct drm_buf **temp_buflist;
 960
 961         if (!drm_core_check_feature(dev, DRIVER_SG))
 962                 return -EINVAL;
 963
 964         if (!dma)
 965                 return -EINVAL;
 966
 967         if (!capable(CAP_SYS_ADMIN))
 968                 return -EPERM;
 969
 970         count = request->count;
 971         order = drm_order(request->size);
 972         size = 1 << order;
 973
 974         alignment = (request->flags & _DRM_PAGE_ALIGN)
 975             ? PAGE_ALIGN(size) : size;
 976         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 977         total = PAGE_SIZE << page_order;
 978
 979         byte_count = 0;
 980         agp_offset = request->agp_start;
 981
 982         DRM_DEBUG("count:      %d\n", count);
 983         DRM_DEBUG("order:      %d\n", order);
 984         DRM_DEBUG("size:       %d\n", size);
 985         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 986         DRM_DEBUG("alignment:  %d\n", alignment);
 987         DRM_DEBUG("page_order: %d\n", page_order);
 988         DRM_DEBUG("total:      %d\n", total);
 989
 990         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 991                 return -EINVAL;
 992         if (dev->queue_count)
 993                 return -EBUSY;  /* Not while in use */
 994
 995         spin_lock(&dev->count_lock);
 996         if (dev->buf_use) {
 997                 spin_unlock(&dev->count_lock);
 998                 return -EBUSY;
 999         }
1000         atomic_inc(&dev->buf_alloc);
1001         spin_unlock(&dev->count_lock);
1002
1003         mutex_lock(&dev->struct_mutex);
1004         entry = &dma->bufs[order];
1005         if (entry->buf_count) {
1006                 mutex_unlock(&dev->struct_mutex);
1007                 atomic_dec(&dev->buf_alloc);
1008                 return -ENOMEM; /* May only call once for each order */
1009         }
1010
1011         if (count < 0 || count > 4096) {
1012                 mutex_unlock(&dev->struct_mutex);
1013                 atomic_dec(&dev->buf_alloc);
1014                 return -EINVAL;
1015         }
1016
1017         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1018                                    DRM_MEM_BUFS);
1019         if (!entry->buflist) {
1020                 mutex_unlock(&dev->struct_mutex);
1021                 atomic_dec(&dev->buf_alloc);
1022                 return -ENOMEM;
1023         }
1024         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1025
1026         entry->buf_size = size;
1027         entry->page_order = page_order;
1028
1029         offset = 0;
1030
1031         while (entry->buf_count < count) {
1032                 buf = &entry->buflist[entry->buf_count];
1033                 buf->idx = dma->buf_count + entry->buf_count;
1034                 buf->total = alignment;
1035                 buf->order = order;
1036                 buf->used = 0;
1037
1038                 buf->offset = (dma->byte_count + offset);
1039                 buf->bus_address = agp_offset + offset;
1040                 buf->address = (void *)(agp_offset + offset
1041                                         + (unsigned long)dev->sg->virtual);
1042                 buf->next = NULL;
1043                 buf->waiting = 0;
1044                 buf->pending = 0;
1045                 init_waitqueue_head(&buf->dma_wait);
1046                 buf->file_priv = NULL;
1047
1048                 buf->dev_priv_size = dev->driver->dev_priv_size;
1049                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1050                 if (!buf->dev_private) {
1051                         /* Set count correctly so we free the proper amount. */
1052                         entry->buf_count = count;
1053                         drm_cleanup_buf_error(dev, entry);
1054                         mutex_unlock(&dev->struct_mutex);
1055                         atomic_dec(&dev->buf_alloc);
1056                         return -ENOMEM;
1057                 }
1058
1059                 memset(buf->dev_private, 0, buf->dev_priv_size);
1060
1061                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1062
1063                 offset += alignment;
1064                 entry->buf_count++;
1065                 byte_count += PAGE_SIZE << page_order;
1066         }
1067
1068         DRM_DEBUG("byte_count: %d\n", byte_count);
1069
1070         temp_buflist = drm_realloc(dma->buflist,
1071                                    dma->buf_count * sizeof(*dma->buflist),
1072                                    (dma->buf_count + entry->buf_count)
1073                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1074         if (!temp_buflist) {
1075                 /* Free the entry because it isn't valid */
1076                 drm_cleanup_buf_error(dev, entry);
1077                 mutex_unlock(&dev->struct_mutex);
1078                 atomic_dec(&dev->buf_alloc);
1079                 return -ENOMEM;
1080         }
1081         dma->buflist = temp_buflist;
1082
1083         for (i = 0; i < entry->buf_count; i++) {
1084                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1085         }
1086
1087         dma->buf_count += entry->buf_count;
1088         dma->seg_count += entry->seg_count;
1089         dma->page_count += byte_count >> PAGE_SHIFT;
1090         dma->byte_count += byte_count;
1091
1092         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1093         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1094
1095         mutex_unlock(&dev->struct_mutex);
1096
1097         request->count = entry->buf_count;
1098         request->size = size;
1099
1100         dma->flags = _DRM_DMA_USE_SG;
1101
1102         atomic_dec(&dev->buf_alloc);
1103         return 0;
1104 }
1105
1106 int drm_addbufs_fb(struct drm_device *dev, struct drm_buf_desc *request)
1107 {
1108         struct drm_device_dma *dma = dev->dma;
1109         struct drm_buf_entry *entry;
1110         struct drm_buf *buf;
1111         unsigned long offset;
1112         unsigned long agp_offset;
1113         int count;
1114         int order;
1115         int size;
1116         int alignment;
1117         int page_order;
1118         int total;
1119         int byte_count;
1120         int i;
1121         struct drm_buf **temp_buflist;
1122
1123         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1124                 return -EINVAL;
1125
1126         if (!dma)
1127                 return -EINVAL;
1128
1129         if (!capable(CAP_SYS_ADMIN))
1130                 return -EPERM;
1131
1132         count = request->count;
1133         order = drm_order(request->size);
1134         size = 1 << order;
1135
1136         alignment = (request->flags & _DRM_PAGE_ALIGN)
1137             ? PAGE_ALIGN(size) : size;
1138         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1139         total = PAGE_SIZE << page_order;
1140
1141         byte_count = 0;
1142         agp_offset = request->agp_start;
1143
1144         DRM_DEBUG("count:      %d\n", count);
1145         DRM_DEBUG("order:      %d\n", order);
1146         DRM_DEBUG("size:       %d\n", size);
1147         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1148         DRM_DEBUG("alignment:  %d\n", alignment);
1149         DRM_DEBUG("page_order: %d\n", page_order);
1150         DRM_DEBUG("total:      %d\n", total);
1151
1152         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1153                 return -EINVAL;
1154         if (dev->queue_count)
1155                 return -EBUSY;  /* Not while in use */
1156
1157         spin_lock(&dev->count_lock);
1158         if (dev->buf_use) {
1159                 spin_unlock(&dev->count_lock);
1160                 return -EBUSY;
1161         }
1162         atomic_inc(&dev->buf_alloc);
1163         spin_unlock(&dev->count_lock);
1164
1165         mutex_lock(&dev->struct_mutex);
1166         entry = &dma->bufs[order];
1167         if (entry->buf_count) {
1168                 mutex_unlock(&dev->struct_mutex);
1169                 atomic_dec(&dev->buf_alloc);
1170                 return -ENOMEM; /* May only call once for each order */
1171         }
1172
1173         if (count < 0 || count > 4096) {
1174                 mutex_unlock(&dev->struct_mutex);
1175                 atomic_dec(&dev->buf_alloc);
1176                 return -EINVAL;
1177         }
1178
1179         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1180                                    DRM_MEM_BUFS);
1181         if (!entry->buflist) {
1182                 mutex_unlock(&dev->struct_mutex);
1183                 atomic_dec(&dev->buf_alloc);
1184                 return -ENOMEM;
1185         }
1186         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1187
1188         entry->buf_size = size;
1189         entry->page_order = page_order;
1190
1191         offset = 0;
1192
1193         while (entry->buf_count < count) {
1194                 buf = &entry->buflist[entry->buf_count];
1195                 buf->idx = dma->buf_count + entry->buf_count;
1196                 buf->total = alignment;
1197                 buf->order = order;
1198                 buf->used = 0;
1199
1200                 buf->offset = (dma->byte_count + offset);
1201                 buf->bus_address = agp_offset + offset;
1202                 buf->address = (void *)(agp_offset + offset);
1203                 buf->next = NULL;
1204                 buf->waiting = 0;
1205                 buf->pending = 0;
1206                 init_waitqueue_head(&buf->dma_wait);
1207                 buf->file_priv = NULL;
1208
1209                 buf->dev_priv_size = dev->driver->dev_priv_size;
1210                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1211                 if (!buf->dev_private) {
1212                         /* Set count correctly so we free the proper amount. */
1213                         entry->buf_count = count;
1214                         drm_cleanup_buf_error(dev, entry);
1215                         mutex_unlock(&dev->struct_mutex);
1216                         atomic_dec(&dev->buf_alloc);
1217                         return -ENOMEM;
1218                 }
1219                 memset(buf->dev_private, 0, buf->dev_priv_size);
1220
1221                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1222
1223                 offset += alignment;
1224                 entry->buf_count++;
1225                 byte_count += PAGE_SIZE << page_order;
1226         }
1227
1228         DRM_DEBUG("byte_count: %d\n", byte_count);
1229
1230         temp_buflist = drm_realloc(dma->buflist,
1231                                    dma->buf_count * sizeof(*dma->buflist),
1232                                    (dma->buf_count + entry->buf_count)
1233                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1234         if (!temp_buflist) {
1235                 /* Free the entry because it isn't valid */
1236                 drm_cleanup_buf_error(dev, entry);
1237                 mutex_unlock(&dev->struct_mutex);
1238                 atomic_dec(&dev->buf_alloc);
1239                 return -ENOMEM;
1240         }
1241         dma->buflist = temp_buflist;
1242
1243         for (i = 0; i < entry->buf_count; i++) {
1244                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1245         }
1246
1247         dma->buf_count += entry->buf_count;
1248         dma->seg_count += entry->seg_count;
1249         dma->page_count += byte_count >> PAGE_SHIFT;
1250         dma->byte_count += byte_count;
1251
1252         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1253         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1254
1255         mutex_unlock(&dev->struct_mutex);
1256
1257         request->count = entry->buf_count;
1258         request->size = size;
1259
1260         dma->flags = _DRM_DMA_USE_FB;
1261
1262         atomic_dec(&dev->buf_alloc);
1263         return 0;
1264 }
1265 EXPORT_SYMBOL(drm_addbufs_fb);
1266
1267
1268 /**
1269  * Add buffers for DMA transfers (ioctl).
1270  *
1271  * \param inode device inode.
1272  * \param file_priv DRM file private.
1273  * \param cmd command.
1274  * \param arg pointer to a struct drm_buf_desc request.
1275  * \return zero on success or a negative number on failure.
1276  *
1277  * According with the memory type specified in drm_buf_desc::flags and the
1278  * build options, it dispatches the call either to addbufs_agp(),
1279  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1280  * PCI memory respectively.
1281  */
1282 int drm_addbufs(struct drm_device *dev, void *data,
1283                 struct drm_file *file_priv)
1284 {
1285         struct drm_buf_desc *request = data;
1286         int ret;
1287
1288         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1289                 return -EINVAL;
1290
1291 #if __OS_HAS_AGP
1292         if (request->flags & _DRM_AGP_BUFFER)
1293                 ret = drm_addbufs_agp(dev, request);
1294         else
1295 #endif
1296         if (request->flags & _DRM_SG_BUFFER)
1297                 ret = drm_addbufs_sg(dev, request);
1298         else if (request->flags & _DRM_FB_BUFFER)
1299                 ret = drm_addbufs_fb(dev, request);
1300         else
1301                 ret = drm_addbufs_pci(dev, request);
1302
1303         return ret;
1304 }
1305
1306 /**
1307  * Get information about the buffer mappings.
1308  *
1309  * This was originally mean for debugging purposes, or by a sophisticated
1310  * client library to determine how best to use the available buffers (e.g.,
1311  * large buffers can be used for image transfer).
1312  *
1313  * \param inode device inode.
1314  * \param file_priv DRM file private.
1315  * \param cmd command.
1316  * \param arg pointer to a drm_buf_info structure.
1317  * \return zero on success or a negative number on failure.
1318  *
1319  * Increments drm_device::buf_use while holding the drm_device::count_lock
1320  * lock, preventing of allocating more buffers after this call. Information
1321  * about each requested buffer is then copied into user space.
1322  */
1323 int drm_infobufs(struct drm_device *dev, void *data,
1324                  struct drm_file *file_priv)
1325 {
1326         struct drm_device_dma *dma = dev->dma;
1327         struct drm_buf_info *request = data;
1328         int i;
1329         int count;
1330
1331         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1332                 return -EINVAL;
1333
1334         if (!dma)
1335                 return -EINVAL;
1336
1337         spin_lock(&dev->count_lock);
1338         if (atomic_read(&dev->buf_alloc)) {
1339                 spin_unlock(&dev->count_lock);
1340                 return -EBUSY;
1341         }
1342         ++dev->buf_use;         /* Can't allocate more after this call */
1343         spin_unlock(&dev->count_lock);
1344
1345         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1346                 if (dma->bufs[i].buf_count)
1347                         ++count;
1348         }
1349
1350         DRM_DEBUG("count = %d\n", count);
1351
1352         if (request->count >= count) {
1353                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1354                         if (dma->bufs[i].buf_count) {
1355                                 struct drm_buf_desc __user *to =
1356                                     &request->list[count];
1357                                 struct drm_buf_entry *from = &dma->bufs[i];
1358                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1359                                 if (copy_to_user(&to->count,
1360                                                  &from->buf_count,
1361                                                  sizeof(from->buf_count)) ||
1362                                     copy_to_user(&to->size,
1363                                                  &from->buf_size,
1364                                                  sizeof(from->buf_size)) ||
1365                                     copy_to_user(&to->low_mark,
1366                                                  &list->low_mark,
1367                                                  sizeof(list->low_mark)) ||
1368                                     copy_to_user(&to->high_mark,
1369                                                  &list->high_mark,
1370                                                  sizeof(list->high_mark)))
1371                                         return -EFAULT;
1372
1373                                 DRM_DEBUG("%d %d %d %d %d\n",
1374                                           i,
1375                                           dma->bufs[i].buf_count,
1376                                           dma->bufs[i].buf_size,
1377                                           dma->bufs[i].freelist.low_mark,
1378                                           dma->bufs[i].freelist.high_mark);
1379                                 ++count;
1380                         }
1381                 }
1382         }
1383         request->count = count;
1384
1385         return 0;
1386 }
1387
1388 /**
1389  * Specifies a low and high water mark for buffer allocation
1390  *
1391  * \param inode device inode.
1392  * \param file_priv DRM file private.
1393  * \param cmd command.
1394  * \param arg a pointer to a drm_buf_desc structure.
1395  * \return zero on success or a negative number on failure.
1396  *
1397  * Verifies that the size order is bounded between the admissible orders and
1398  * updates the respective drm_device_dma::bufs entry low and high water mark.
1399  *
1400  * \note This ioctl is deprecated and mostly never used.
1401  */
1402 int drm_markbufs(struct drm_device *dev, void *data,
1403                  struct drm_file *file_priv)
1404 {
1405         struct drm_device_dma *dma = dev->dma;
1406         struct drm_buf_desc *request = data;
1407         int order;
1408         struct drm_buf_entry *entry;
1409
1410         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1411                 return -EINVAL;
1412
1413         if (!dma)
1414                 return -EINVAL;
1415
1416         DRM_DEBUG("%d, %d, %d\n",
1417                   request->size, request->low_mark, request->high_mark);
1418         order = drm_order(request->size);
1419         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1420                 return -EINVAL;
1421         entry = &dma->bufs[order];
1422
1423         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1424                 return -EINVAL;
1425         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1426                 return -EINVAL;
1427
1428         entry->freelist.low_mark = request->low_mark;
1429         entry->freelist.high_mark = request->high_mark;
1430
1431         return 0;
1432 }
1433
1434 /**
1435  * Unreserve the buffers in list, previously reserved using drmDMA.
1436  *
1437  * \param inode device inode.
1438  * \param file_priv DRM file private.
1439  * \param cmd command.
1440  * \param arg pointer to a drm_buf_free structure.
1441  * \return zero on success or a negative number on failure.
1442  *
1443  * Calls free_buffer() for each used buffer.
1444  * This function is primarily used for debugging.
1445  */
1446 int drm_freebufs(struct drm_device *dev, void *data,
1447                  struct drm_file *file_priv)
1448 {
1449         struct drm_device_dma *dma = dev->dma;
1450         struct drm_buf_free *request = data;
1451         int i;
1452         int idx;
1453         struct drm_buf *buf;
1454
1455         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1456                 return -EINVAL;
1457
1458         if (!dma)
1459                 return -EINVAL;
1460
1461         DRM_DEBUG("%d\n", request->count);
1462         for (i = 0; i < request->count; i++) {
1463                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1464                         return -EFAULT;
1465                 if (idx < 0 || idx >= dma->buf_count) {
1466                         DRM_ERROR("Index %d (of %d max)\n",
1467                                   idx, dma->buf_count - 1);
1468                         return -EINVAL;
1469                 }
1470                 buf = dma->buflist[idx];
1471                 if (buf->file_priv != file_priv) {
1472                         DRM_ERROR("Process %d freeing buffer not owned\n",
1473                                   current->pid);
1474                         return -EINVAL;
1475                 }
1476                 drm_free_buffer(dev, buf);
1477         }
1478
1479         return 0;
1480 }
1481
1482 /**
1483  * Maps all of the DMA buffers into client-virtual space (ioctl).
1484  *
1485  * \param inode device inode.
1486  * \param file_priv DRM file private.
1487  * \param cmd command.
1488  * \param arg pointer to a drm_buf_map structure.
1489  * \return zero on success or a negative number on failure.
1490  *
1491  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1492  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1493  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1494  * drm_mmap_dma().
1495  */
1496 int drm_mapbufs(struct drm_device *dev, void *data,
1497                 struct drm_file *file_priv)
1498 {
1499         struct drm_device_dma *dma = dev->dma;
1500         int retcode = 0;
1501         const int zero = 0;
1502         unsigned long virtual;
1503         unsigned long address;
1504         struct drm_buf_map *request = data;
1505         int i;
1506
1507         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1508                 return -EINVAL;
1509
1510         if (!dma)
1511                 return -EINVAL;
1512
1513         spin_lock(&dev->count_lock);
1514         if (atomic_read(&dev->buf_alloc)) {
1515                 spin_unlock(&dev->count_lock);
1516                 return -EBUSY;
1517         }
1518         dev->buf_use++;         /* Can't allocate more after this call */
1519         spin_unlock(&dev->count_lock);
1520
1521         if (request->count >= dma->buf_count) {
1522                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1523                     || (drm_core_check_feature(dev, DRIVER_SG)
1524                         && (dma->flags & _DRM_DMA_USE_SG))
1525                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1526                         && (dma->flags & _DRM_DMA_USE_FB))) {
1527                         struct drm_map *map = dev->agp_buffer_map;
1528                         unsigned long token = dev->agp_buffer_token;
1529
1530                         if (!map) {
1531                                 retcode = -EINVAL;
1532                                 goto done;
1533                         }
1534                         down_write(&current->mm->mmap_sem);
1535                         virtual = do_mmap(file_priv->filp, 0, map->size,
1536                                           PROT_READ | PROT_WRITE,
1537                                           MAP_SHARED,
1538                                           token);
1539                         up_write(&current->mm->mmap_sem);
1540                 } else {
1541                         down_write(&current->mm->mmap_sem);
1542                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1543                                           PROT_READ | PROT_WRITE,
1544                                           MAP_SHARED, 0);
1545                         up_write(&current->mm->mmap_sem);
1546                 }
1547                 if (virtual > -1024UL) {
1548                         /* Real error */
1549                         retcode = (signed long)virtual;
1550                         goto done;
1551                 }
1552                 request->virtual = (void __user *)virtual;
1553
1554                 for (i = 0; i < dma->buf_count; i++) {
1555                         if (copy_to_user(&request->list[i].idx,
1556                                          &dma->buflist[i]->idx,
1557                                          sizeof(request->list[0].idx))) {
1558                                 retcode = -EFAULT;
1559                                 goto done;
1560                         }
1561                         if (copy_to_user(&request->list[i].total,
1562                                          &dma->buflist[i]->total,
1563                                          sizeof(request->list[0].total))) {
1564                                 retcode = -EFAULT;
1565                                 goto done;
1566                         }
1567                         if (copy_to_user(&request->list[i].used,
1568                                          &zero, sizeof(zero))) {
1569                                 retcode = -EFAULT;
1570                                 goto done;
1571                         }
1572                         address = virtual + dma->buflist[i]->offset;    /* *** */
1573                         if (copy_to_user(&request->list[i].address,
1574                                          &address, sizeof(address))) {
1575                                 retcode = -EFAULT;
1576                                 goto done;
1577                         }
1578                 }
1579         }
1580       done:
1581         request->count = dma->buf_count;
1582         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1583
1584         return retcode;
1585 }
1586
1587 /**
1588  * Compute size order.  Returns the exponent of the smaller power of two which
1589  * is greater or equal to given number.
1590  *
1591  * \param size size.
1592  * \return order.
1593  *
1594  * \todo Can be made faster.
1595  */
1596 int drm_order(unsigned long size)
1597 {
1598         int order;
1599         unsigned long tmp;
1600
1601         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1602
1603         if (size & (size - 1))
1604                 ++order;
1605
1606         return order;
1607 }
1608 EXPORT_SYMBOL(drm_order);