drivers/gpu/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 <linux/slab.h>
  38 #include <linux/log2.h>
  39 #include <asm/shmparam.h>
  40 #include "drmP.h"
  41
  42 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  43                                                   struct drm_local_map *map)
  44 {
  45         struct drm_map_list *entry;
  46         list_for_each_entry(entry, &dev->maplist, head) {
  47                 /*
  48                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  49                  * while PCI resources may live above that, we ignore the map
  50                  * offset for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  51                  * It is assumed that each driver will have only one resource of
  52                  * each type.
  53                  */
  54                 if (!entry->map ||
  55                     map->type != entry->map->type ||
  56                     entry->master != dev->primary->master)
  57                         continue;
  58                 switch (map->type) {
  59                 case _DRM_SHM:
  60                         if (map->flags != _DRM_CONTAINS_LOCK)
  61                                 break;
  62                 case _DRM_REGISTERS:
  63                 case _DRM_FRAME_BUFFER:
  64                         return entry;
  65                 default: /* Make gcc happy */
  66                         ;
  67                 }
  68                 if (entry->map->offset == map->offset)
  69                         return entry;
  70         }
  71
  72         return NULL;
  73 }
  74
  75 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  76                           unsigned long user_token, int hashed_handle, int shm)
  77 {
  78         int use_hashed_handle, shift;
  79         unsigned long add;
  80
  81 #if (BITS_PER_LONG == 64)
  82         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  83 #elif (BITS_PER_LONG == 32)
  84         use_hashed_handle = hashed_handle;
  85 #else
  86 #error Unsupported long size. Neither 64 nor 32 bits.
  87 #endif
  88
  89         if (!use_hashed_handle) {
  90                 int ret;
  91                 hash->key = user_token >> PAGE_SHIFT;
  92                 ret = drm_ht_insert_item(&dev->map_hash, hash);
  93                 if (ret != -EINVAL)
  94                         return ret;
  95         }
  96
  97         shift = 0;
  98         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
  99         if (shm && (SHMLBA > PAGE_SIZE)) {
 100                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 101
 102                 /* For shared memory, we have to preserve the SHMLBA
 103                  * bits of the eventual vma->vm_pgoff value during
 104                  * mmap().  Otherwise we run into cache aliasing problems
 105                  * on some platforms.  On these platforms, the pgoff of
 106                  * a mmap() request is used to pick a suitable virtual
 107                  * address for the mmap() region such that it will not
 108                  * cause cache aliasing problems.
 109                  *
 110                  * Therefore, make sure the SHMLBA relevant bits of the
 111                  * hash value we use are equal to those in the original
 112                  * kernel virtual address.
 113                  */
 114                 shift = bits;
 115                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 116         }
 117
 118         return drm_ht_just_insert_please(&dev->map_hash, hash,
 119                                          user_token, 32 - PAGE_SHIFT - 3,
 120                                          shift, add);
 121 }
 122
 123 /**
 124  * Core function to create a range of memory available for mapping by a
 125  * non-root process.
 126  *
 127  * Adjusts the memory offset to its absolute value according to the mapping
 128  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 129  * applicable and if supported by the kernel.
 130  */
 131 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 132                            unsigned int size, enum drm_map_type type,
 133                            enum drm_map_flags flags,
 134                            struct drm_map_list ** maplist)
 135 {
 136         struct drm_local_map *map;
 137         struct drm_map_list *list;
 138         drm_dma_handle_t *dmah;
 139         unsigned long user_token;
 140         int ret;
 141
 142         map = kmalloc(sizeof(*map), GFP_KERNEL);
 143         if (!map)
 144                 return -ENOMEM;
 145
 146         map->offset = offset;
 147         map->size = size;
 148         map->flags = flags;
 149         map->type = type;
 150
 151         /* Only allow shared memory to be removable since we only keep enough
 152          * book keeping information about shared memory to allow for removal
 153          * when processes fork.
 154          */
 155         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 156                 kfree(map);
 157                 return -EINVAL;
 158         }
 159         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 160                   (unsigned long long)map->offset, map->size, map->type);
 161
 162         /* page-align _DRM_SHM maps. They are allocated here so there is no security
 163          * hole created by that and it works around various broken drivers that use
 164          * a non-aligned quantity to map the SAREA. --BenH
 165          */
 166         if (map->type == _DRM_SHM)
 167                 map->size = PAGE_ALIGN(map->size);
 168
 169         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 170                 kfree(map);
 171                 return -EINVAL;
 172         }
 173         map->mtrr = -1;
 174         map->handle = NULL;
 175
 176         switch (map->type) {
 177         case _DRM_REGISTERS:
 178         case _DRM_FRAME_BUFFER:
 179 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
 180                 if (map->offset + (map->size-1) < map->offset ||
 181                     map->offset < virt_to_phys(high_memory)) {
 182                         kfree(map);
 183                         return -EINVAL;
 184                 }
 185 #endif
 186 #ifdef __alpha__
 187                 map->offset += dev->hose->mem_space->start;
 188 #endif
 189                 /* Some drivers preinitialize some maps, without the X Server
 190                  * needing to be aware of it.  Therefore, we just return success
 191                  * when the server tries to create a duplicate map.
 192                  */
 193                 list = drm_find_matching_map(dev, map);
 194                 if (list != NULL) {
 195                         if (list->map->size != map->size) {
 196                                 DRM_DEBUG("Matching maps of type %d with "
 197                                           "mismatched sizes, (%ld vs %ld)\n",
 198                                           map->type, map->size,
 199                                           list->map->size);
 200                                 list->map->size = map->size;
 201                         }
 202
 203                         kfree(map);
 204                         *maplist = list;
 205                         return 0;
 206                 }
 207
 208                 if (drm_core_has_MTRR(dev)) {
 209                         if (map->type == _DRM_FRAME_BUFFER ||
 210                             (map->flags & _DRM_WRITE_COMBINING)) {
 211                                 map->mtrr = mtrr_add(map->offset, map->size,
 212                                                      MTRR_TYPE_WRCOMB, 1);
 213                         }
 214                 }
 215                 if (map->type == _DRM_REGISTERS) {
 216                         map->handle = ioremap(map->offset, map->size);
 217                         if (!map->handle) {
 218                                 kfree(map);
 219                                 return -ENOMEM;
 220                         }
 221                 }
 222
 223                 break;
 224         case _DRM_SHM:
 225                 list = drm_find_matching_map(dev, map);
 226                 if (list != NULL) {
 227                         if(list->map->size != map->size) {
 228                                 DRM_DEBUG("Matching maps of type %d with "
 229                                           "mismatched sizes, (%ld vs %ld)\n",
 230                                           map->type, map->size, list->map->size);
 231                                 list->map->size = map->size;
 232                         }
 233
 234                         kfree(map);
 235                         *maplist = list;
 236                         return 0;
 237                 }
 238                 map->handle = vmalloc_user(map->size);
 239                 DRM_DEBUG("%lu %d %p\n",
 240                           map->size, drm_order(map->size), map->handle);
 241                 if (!map->handle) {
 242                         kfree(map);
 243                         return -ENOMEM;
 244                 }
 245                 map->offset = (unsigned long)map->handle;
 246                 if (map->flags & _DRM_CONTAINS_LOCK) {
 247                         /* Prevent a 2nd X Server from creating a 2nd lock */
 248                         if (dev->primary->master->lock.hw_lock != NULL) {
 249                                 vfree(map->handle);
 250                                 kfree(map);
 251                                 return -EBUSY;
 252                         }
 253                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 254                 }
 255                 break;
 256         case _DRM_AGP: {
 257                 struct drm_agp_mem *entry;
 258                 int valid = 0;
 259
 260                 if (!drm_core_has_AGP(dev)) {
 261                         kfree(map);
 262                         return -EINVAL;
 263                 }
 264 #ifdef __alpha__
 265                 map->offset += dev->hose->mem_space->start;
 266 #endif
 267                 /* In some cases (i810 driver), user space may have already
 268                  * added the AGP base itself, because dev->agp->base previously
 269                  * only got set during AGP enable.  So, only add the base
 270                  * address if the map's offset isn't already within the
 271                  * aperture.
 272                  */
 273                 if (map->offset < dev->agp->base ||
 274                     map->offset > dev->agp->base +
 275                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 276                         map->offset += dev->agp->base;
 277                 }
 278                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 279
 280                 /* This assumes the DRM is in total control of AGP space.
 281                  * It's not always the case as AGP can be in the control
 282                  * of user space (i.e. i810 driver). So this loop will get
 283                  * skipped and we double check that dev->agp->memory is
 284                  * actually set as well as being invalid before EPERM'ing
 285                  */
 286                 list_for_each_entry(entry, &dev->agp->memory, head) {
 287                         if ((map->offset >= entry->bound) &&
 288                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 289                                 valid = 1;
 290                                 break;
 291                         }
 292                 }
 293                 if (!list_empty(&dev->agp->memory) && !valid) {
 294                         kfree(map);
 295                         return -EPERM;
 296                 }
 297                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 298                           (unsigned long long)map->offset, map->size);
 299
 300                 break;
 301         }
 302         case _DRM_GEM:
 303                 DRM_ERROR("tried to addmap GEM object\n");
 304                 break;
 305         case _DRM_SCATTER_GATHER:
 306                 if (!dev->sg) {
 307                         kfree(map);
 308                         return -EINVAL;
 309                 }
 310                 map->offset += (unsigned long)dev->sg->virtual;
 311                 break;
 312         case _DRM_CONSISTENT:
 313                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 314                  * As we're limiting the address to 2^32-1 (or less),
 315                  * casting it down to 32 bits is no problem, but we
 316                  * need to point to a 64bit variable first. */
 317                 dmah = drm_pci_alloc(dev, map->size, map->size);
 318                 if (!dmah) {
 319                         kfree(map);
 320                         return -ENOMEM;
 321                 }
 322                 map->handle = dmah->vaddr;
 323                 map->offset = (unsigned long)dmah->busaddr;
 324                 kfree(dmah);
 325                 break;
 326         default:
 327                 kfree(map);
 328                 return -EINVAL;
 329         }
 330
 331         list = kmalloc(sizeof(*list), GFP_KERNEL);
 332         if (!list) {
 333                 if (map->type == _DRM_REGISTERS)
 334                         iounmap(map->handle);
 335                 kfree(map);
 336                 return -EINVAL;
 337         }
 338         memset(list, 0, sizeof(*list));
 339         list->map = map;
 340
 341         mutex_lock(&dev->struct_mutex);
 342         list_add(&list->head, &dev->maplist);
 343
 344         /* Assign a 32-bit handle */
 345         /* We do it here so that dev->struct_mutex protects the increment */
 346         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 347                 map->offset;
 348         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 349                              (map->type == _DRM_SHM));
 350         if (ret) {
 351                 if (map->type == _DRM_REGISTERS)
 352                         iounmap(map->handle);
 353                 kfree(map);
 354                 kfree(list);
 355                 mutex_unlock(&dev->struct_mutex);
 356                 return ret;
 357         }
 358
 359         list->user_token = list->hash.key << PAGE_SHIFT;
 360         mutex_unlock(&dev->struct_mutex);
 361
 362         if (!(map->flags & _DRM_DRIVER))
 363                 list->master = dev->primary->master;
 364         *maplist = list;
 365         return 0;
 366         }
 367
 368 int drm_addmap(struct drm_device * dev, resource_size_t offset,
 369                unsigned int size, enum drm_map_type type,
 370                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 371 {
 372         struct drm_map_list *list;
 373         int rc;
 374
 375         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 376         if (!rc)
 377                 *map_ptr = list->map;
 378         return rc;
 379 }
 380
 381 EXPORT_SYMBOL(drm_addmap);
 382
 383 /**
 384  * Ioctl to specify a range of memory that is available for mapping by a
 385  * non-root process.
 386  *
 387  * \param inode device inode.
 388  * \param file_priv DRM file private.
 389  * \param cmd command.
 390  * \param arg pointer to a drm_map structure.
 391  * \return zero on success or a negative value on error.
 392  *
 393  */
 394 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 395                      struct drm_file *file_priv)
 396 {
 397         struct drm_map *map = data;
 398         struct drm_map_list *maplist;
 399         int err;
 400
 401         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 402                 return -EPERM;
 403
 404         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 405                               map->flags, &maplist);
 406
 407         if (err)
 408                 return err;
 409
 410         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 411         map->handle = (void *)(unsigned long)maplist->user_token;
 412         return 0;
 413 }
 414
 415 /**
 416  * Remove a map private from list and deallocate resources if the mapping
 417  * isn't in use.
 418  *
 419  * Searches the map on drm_device::maplist, removes it from the list, see if
 420  * its being used, and free any associate resource (such as MTRR's) if it's not
 421  * being on use.
 422  *
 423  * \sa drm_addmap
 424  */
 425 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 426 {
 427         struct drm_map_list *r_list = NULL, *list_t;
 428         drm_dma_handle_t dmah;
 429         int found = 0;
 430         struct drm_master *master;
 431
 432         /* Find the list entry for the map and remove it */
 433         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 434                 if (r_list->map == map) {
 435                         master = r_list->master;
 436                         list_del(&r_list->head);
 437                         drm_ht_remove_key(&dev->map_hash,
 438                                           r_list->user_token >> PAGE_SHIFT);
 439                         kfree(r_list);
 440                         found = 1;
 441                         break;
 442                 }
 443         }
 444
 445         if (!found)
 446                 return -EINVAL;
 447
 448         switch (map->type) {
 449         case _DRM_REGISTERS:
 450                 iounmap(map->handle);
 451                 /* FALLTHROUGH */
 452         case _DRM_FRAME_BUFFER:
 453                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 454                         int retcode;
 455                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 456                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 457                 }
 458                 break;
 459         case _DRM_SHM:
 460                 vfree(map->handle);
 461                 if (master) {
 462                         if (dev->sigdata.lock == master->lock.hw_lock)
 463                                 dev->sigdata.lock = NULL;
 464                         master->lock.hw_lock = NULL;   /* SHM removed */
 465                         master->lock.file_priv = NULL;
 466                         wake_up_interruptible_all(&master->lock.lock_queue);
 467                 }
 468                 break;
 469         case _DRM_AGP:
 470         case _DRM_SCATTER_GATHER:
 471                 break;
 472         case _DRM_CONSISTENT:
 473                 dmah.vaddr = map->handle;
 474                 dmah.busaddr = map->offset;
 475                 dmah.size = map->size;
 476                 __drm_pci_free(dev, &dmah);
 477                 break;
 478         case _DRM_GEM:
 479                 DRM_ERROR("tried to rmmap GEM object\n");
 480                 break;
 481         }
 482         kfree(map);
 483
 484         return 0;
 485 }
 486 EXPORT_SYMBOL(drm_rmmap_locked);
 487
 488 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 489 {
 490         int ret;
 491
 492         mutex_lock(&dev->struct_mutex);
 493         ret = drm_rmmap_locked(dev, map);
 494         mutex_unlock(&dev->struct_mutex);
 495
 496         return ret;
 497 }
 498 EXPORT_SYMBOL(drm_rmmap);
 499
 500 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 501  * the last close of the device, and this is necessary for cleanup when things
 502  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 503  * like a pointless exercise since they're going away anyway.
 504  *
 505  * One use case might be after addmap is allowed for normal users for SHM and
 506  * gets used by drivers that the server doesn't need to care about.  This seems
 507  * unlikely.
 508  *
 509  * \param inode device inode.
 510  * \param file_priv DRM file private.
 511  * \param cmd command.
 512  * \param arg pointer to a struct drm_map structure.
 513  * \return zero on success or a negative value on error.
 514  */
 515 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 516                     struct drm_file *file_priv)
 517 {
 518         struct drm_map *request = data;
 519         struct drm_local_map *map = NULL;
 520         struct drm_map_list *r_list;
 521         int ret;
 522
 523         mutex_lock(&dev->struct_mutex);
 524         list_for_each_entry(r_list, &dev->maplist, head) {
 525                 if (r_list->map &&
 526                     r_list->user_token == (unsigned long)request->handle &&
 527                     r_list->map->flags & _DRM_REMOVABLE) {
 528                         map = r_list->map;
 529                         break;
 530                 }
 531         }
 532
 533         /* List has wrapped around to the head pointer, or its empty we didn't
 534          * find anything.
 535          */
 536         if (list_empty(&dev->maplist) || !map) {
 537                 mutex_unlock(&dev->struct_mutex);
 538                 return -EINVAL;
 539         }
 540
 541         /* Register and framebuffer maps are permanent */
 542         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 543                 mutex_unlock(&dev->struct_mutex);
 544                 return 0;
 545         }
 546
 547         ret = drm_rmmap_locked(dev, map);
 548
 549         mutex_unlock(&dev->struct_mutex);
 550
 551         return ret;
 552 }
 553
 554 /**
 555  * Cleanup after an error on one of the addbufs() functions.
 556  *
 557  * \param dev DRM device.
 558  * \param entry buffer entry where the error occurred.
 559  *
 560  * Frees any pages and buffers associated with the given entry.
 561  */
 562 static void drm_cleanup_buf_error(struct drm_device * dev,
 563                                   struct drm_buf_entry * entry)
 564 {
 565         int i;
 566
 567         if (entry->seg_count) {
 568                 for (i = 0; i < entry->seg_count; i++) {
 569                         if (entry->seglist[i]) {
 570                                 drm_pci_free(dev, entry->seglist[i]);
 571                         }
 572                 }
 573                 kfree(entry->seglist);
 574
 575                 entry->seg_count = 0;
 576         }
 577
 578         if (entry->buf_count) {
 579                 for (i = 0; i < entry->buf_count; i++) {
 580                         kfree(entry->buflist[i].dev_private);
 581                 }
 582                 kfree(entry->buflist);
 583
 584                 entry->buf_count = 0;
 585         }
 586 }
 587
 588 #if __OS_HAS_AGP
 589 /**
 590  * Add AGP buffers for DMA transfers.
 591  *
 592  * \param dev struct drm_device to which the buffers are to be added.
 593  * \param request pointer to a struct drm_buf_desc describing the request.
 594  * \return zero on success or a negative number on failure.
 595  *
 596  * After some sanity checks creates a drm_buf structure for each buffer and
 597  * reallocates the buffer list of the same size order to accommodate the new
 598  * buffers.
 599  */
 600 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 601 {
 602         struct drm_device_dma *dma = dev->dma;
 603         struct drm_buf_entry *entry;
 604         struct drm_agp_mem *agp_entry;
 605         struct drm_buf *buf;
 606         unsigned long offset;
 607         unsigned long agp_offset;
 608         int count;
 609         int order;
 610         int size;
 611         int alignment;
 612         int page_order;
 613         int total;
 614         int byte_count;
 615         int i, valid;
 616         struct drm_buf **temp_buflist;
 617
 618         if (!dma)
 619                 return -EINVAL;
 620
 621         count = request->count;
 622         order = drm_order(request->size);
 623         size = 1 << order;
 624
 625         alignment = (request->flags & _DRM_PAGE_ALIGN)
 626             ? PAGE_ALIGN(size) : size;
 627         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 628         total = PAGE_SIZE << page_order;
 629
 630         byte_count = 0;
 631         agp_offset = dev->agp->base + request->agp_start;
 632
 633         DRM_DEBUG("count:      %d\n", count);
 634         DRM_DEBUG("order:      %d\n", order);
 635         DRM_DEBUG("size:       %d\n", size);
 636         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 637         DRM_DEBUG("alignment:  %d\n", alignment);
 638         DRM_DEBUG("page_order: %d\n", page_order);
 639         DRM_DEBUG("total:      %d\n", total);
 640
 641         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 642                 return -EINVAL;
 643         if (dev->queue_count)
 644                 return -EBUSY;  /* Not while in use */
 645
 646         /* Make sure buffers are located in AGP memory that we own */
 647         valid = 0;
 648         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 649                 if ((agp_offset >= agp_entry->bound) &&
 650                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 651                         valid = 1;
 652                         break;
 653                 }
 654         }
 655         if (!list_empty(&dev->agp->memory) && !valid) {
 656                 DRM_DEBUG("zone invalid\n");
 657                 return -EINVAL;
 658         }
 659         spin_lock(&dev->count_lock);
 660         if (dev->buf_use) {
 661                 spin_unlock(&dev->count_lock);
 662                 return -EBUSY;
 663         }
 664         atomic_inc(&dev->buf_alloc);
 665         spin_unlock(&dev->count_lock);
 666
 667         mutex_lock(&dev->struct_mutex);
 668         entry = &dma->bufs[order];
 669         if (entry->buf_count) {
 670                 mutex_unlock(&dev->struct_mutex);
 671                 atomic_dec(&dev->buf_alloc);
 672                 return -ENOMEM; /* May only call once for each order */
 673         }
 674
 675         if (count < 0 || count > 4096) {
 676                 mutex_unlock(&dev->struct_mutex);
 677                 atomic_dec(&dev->buf_alloc);
 678                 return -EINVAL;
 679         }
 680
 681         entry->buflist = kmalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 682         if (!entry->buflist) {
 683                 mutex_unlock(&dev->struct_mutex);
 684                 atomic_dec(&dev->buf_alloc);
 685                 return -ENOMEM;
 686         }
 687         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 688
 689         entry->buf_size = size;
 690         entry->page_order = page_order;
 691
 692         offset = 0;
 693
 694         while (entry->buf_count < count) {
 695                 buf = &entry->buflist[entry->buf_count];
 696                 buf->idx = dma->buf_count + entry->buf_count;
 697                 buf->total = alignment;
 698                 buf->order = order;
 699                 buf->used = 0;
 700
 701                 buf->offset = (dma->byte_count + offset);
 702                 buf->bus_address = agp_offset + offset;
 703                 buf->address = (void *)(agp_offset + offset);
 704                 buf->next = NULL;
 705                 buf->waiting = 0;
 706                 buf->pending = 0;
 707                 init_waitqueue_head(&buf->dma_wait);
 708                 buf->file_priv = NULL;
 709
 710                 buf->dev_priv_size = dev->driver->dev_priv_size;
 711                 buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL);
 712                 if (!buf->dev_private) {
 713                         /* Set count correctly so we free the proper amount. */
 714                         entry->buf_count = count;
 715                         drm_cleanup_buf_error(dev, entry);
 716                         mutex_unlock(&dev->struct_mutex);
 717                         atomic_dec(&dev->buf_alloc);
 718                         return -ENOMEM;
 719                 }
 720                 memset(buf->dev_private, 0, buf->dev_priv_size);
 721
 722                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 723
 724                 offset += alignment;
 725                 entry->buf_count++;
 726                 byte_count += PAGE_SIZE << page_order;
 727         }
 728
 729         DRM_DEBUG("byte_count: %d\n", byte_count);
 730
 731         temp_buflist = krealloc(dma->buflist,
 732                                 (dma->buf_count + entry->buf_count) *
 733                                 sizeof(*dma->buflist), GFP_KERNEL);
 734         if (!temp_buflist) {
 735                 /* Free the entry because it isn't valid */
 736                 drm_cleanup_buf_error(dev, entry);
 737                 mutex_unlock(&dev->struct_mutex);
 738                 atomic_dec(&dev->buf_alloc);
 739                 return -ENOMEM;
 740         }
 741         dma->buflist = temp_buflist;
 742
 743         for (i = 0; i < entry->buf_count; i++) {
 744                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 745         }
 746
 747         dma->buf_count += entry->buf_count;
 748         dma->seg_count += entry->seg_count;
 749         dma->page_count += byte_count >> PAGE_SHIFT;
 750         dma->byte_count += byte_count;
 751
 752         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 753         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 754
 755         mutex_unlock(&dev->struct_mutex);
 756
 757         request->count = entry->buf_count;
 758         request->size = size;
 759
 760         dma->flags = _DRM_DMA_USE_AGP;
 761
 762         atomic_dec(&dev->buf_alloc);
 763         return 0;
 764 }
 765 EXPORT_SYMBOL(drm_addbufs_agp);
 766 #endif                          /* __OS_HAS_AGP */
 767
 768 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 769 {
 770         struct drm_device_dma *dma = dev->dma;
 771         int count;
 772         int order;
 773         int size;
 774         int total;
 775         int page_order;
 776         struct drm_buf_entry *entry;
 777         drm_dma_handle_t *dmah;
 778         struct drm_buf *buf;
 779         int alignment;
 780         unsigned long offset;
 781         int i;
 782         int byte_count;
 783         int page_count;
 784         unsigned long *temp_pagelist;
 785         struct drm_buf **temp_buflist;
 786
 787         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 788                 return -EINVAL;
 789
 790         if (!dma)
 791                 return -EINVAL;
 792
 793         if (!capable(CAP_SYS_ADMIN))
 794                 return -EPERM;
 795
 796         count = request->count;
 797         order = drm_order(request->size);
 798         size = 1 << order;
 799
 800         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 801                   request->count, request->size, size, order, dev->queue_count);
 802
 803         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 804                 return -EINVAL;
 805         if (dev->queue_count)
 806                 return -EBUSY;  /* Not while in use */
 807
 808         alignment = (request->flags & _DRM_PAGE_ALIGN)
 809             ? PAGE_ALIGN(size) : size;
 810         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 811         total = PAGE_SIZE << page_order;
 812
 813         spin_lock(&dev->count_lock);
 814         if (dev->buf_use) {
 815                 spin_unlock(&dev->count_lock);
 816                 return -EBUSY;
 817         }
 818         atomic_inc(&dev->buf_alloc);
 819         spin_unlock(&dev->count_lock);
 820
 821         mutex_lock(&dev->struct_mutex);
 822         entry = &dma->bufs[order];
 823         if (entry->buf_count) {
 824                 mutex_unlock(&dev->struct_mutex);
 825                 atomic_dec(&dev->buf_alloc);
 826                 return -ENOMEM; /* May only call once for each order */
 827         }
 828
 829         if (count < 0 || count > 4096) {
 830                 mutex_unlock(&dev->struct_mutex);
 831                 atomic_dec(&dev->buf_alloc);
 832                 return -EINVAL;
 833         }
 834
 835         entry->buflist = kmalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 836         if (!entry->buflist) {
 837                 mutex_unlock(&dev->struct_mutex);
 838                 atomic_dec(&dev->buf_alloc);
 839                 return -ENOMEM;
 840         }
 841         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 842
 843         entry->seglist = kmalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
 844         if (!entry->seglist) {
 845                 kfree(entry->buflist);
 846                 mutex_unlock(&dev->struct_mutex);
 847                 atomic_dec(&dev->buf_alloc);
 848                 return -ENOMEM;
 849         }
 850         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 851
 852         /* Keep the original pagelist until we know all the allocations
 853          * have succeeded
 854          */
 855         temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
 856                                sizeof(*dma->pagelist), GFP_KERNEL);
 857         if (!temp_pagelist) {
 858                 kfree(entry->buflist);
 859                 kfree(entry->seglist);
 860                 mutex_unlock(&dev->struct_mutex);
 861                 atomic_dec(&dev->buf_alloc);
 862                 return -ENOMEM;
 863         }
 864         memcpy(temp_pagelist,
 865                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 866         DRM_DEBUG("pagelist: %d entries\n",
 867                   dma->page_count + (count << page_order));
 868
 869         entry->buf_size = size;
 870         entry->page_order = page_order;
 871         byte_count = 0;
 872         page_count = 0;
 873
 874         while (entry->buf_count < count) {
 875
 876                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 877
 878                 if (!dmah) {
 879                         /* Set count correctly so we free the proper amount. */
 880                         entry->buf_count = count;
 881                         entry->seg_count = count;
 882                         drm_cleanup_buf_error(dev, entry);
 883                         kfree(temp_pagelist);
 884                         mutex_unlock(&dev->struct_mutex);
 885                         atomic_dec(&dev->buf_alloc);
 886                         return -ENOMEM;
 887                 }
 888                 entry->seglist[entry->seg_count++] = dmah;
 889                 for (i = 0; i < (1 << page_order); i++) {
 890                         DRM_DEBUG("page %d @ 0x%08lx\n",
 891                                   dma->page_count + page_count,
 892                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 893                         temp_pagelist[dma->page_count + page_count++]
 894                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 895                 }
 896                 for (offset = 0;
 897                      offset + size <= total && entry->buf_count < count;
 898                      offset += alignment, ++entry->buf_count) {
 899                         buf = &entry->buflist[entry->buf_count];
 900                         buf->idx = dma->buf_count + entry->buf_count;
 901                         buf->total = alignment;
 902                         buf->order = order;
 903                         buf->used = 0;
 904                         buf->offset = (dma->byte_count + byte_count + offset);
 905                         buf->address = (void *)(dmah->vaddr + offset);
 906                         buf->bus_address = dmah->busaddr + offset;
 907                         buf->next = NULL;
 908                         buf->waiting = 0;
 909                         buf->pending = 0;
 910                         init_waitqueue_head(&buf->dma_wait);
 911                         buf->file_priv = NULL;
 912
 913                         buf->dev_priv_size = dev->driver->dev_priv_size;
 914                         buf->dev_private = kmalloc(buf->dev_priv_size,
 915                                                   GFP_KERNEL);
 916                         if (!buf->dev_private) {
 917                                 /* Set count correctly so we free the proper amount. */
 918                                 entry->buf_count = count;
 919                                 entry->seg_count = count;
 920                                 drm_cleanup_buf_error(dev, entry);
 921                                 kfree(temp_pagelist);
 922                                 mutex_unlock(&dev->struct_mutex);
 923                                 atomic_dec(&dev->buf_alloc);
 924                                 return -ENOMEM;
 925                         }
 926                         memset(buf->dev_private, 0, buf->dev_priv_size);
 927
 928                         DRM_DEBUG("buffer %d @ %p\n",
 929                                   entry->buf_count, buf->address);
 930                 }
 931                 byte_count += PAGE_SIZE << page_order;
 932         }
 933
 934         temp_buflist = krealloc(dma->buflist,
 935                                 (dma->buf_count + entry->buf_count) *
 936                                 sizeof(*dma->buflist), GFP_KERNEL);
 937         if (!temp_buflist) {
 938                 /* Free the entry because it isn't valid */
 939                 drm_cleanup_buf_error(dev, entry);
 940                 kfree(temp_pagelist);
 941                 mutex_unlock(&dev->struct_mutex);
 942                 atomic_dec(&dev->buf_alloc);
 943                 return -ENOMEM;
 944         }
 945         dma->buflist = temp_buflist;
 946
 947         for (i = 0; i < entry->buf_count; i++) {
 948                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 949         }
 950
 951         /* No allocations failed, so now we can replace the original pagelist
 952          * with the new one.
 953          */
 954         if (dma->page_count) {
 955                 kfree(dma->pagelist);
 956         }
 957         dma->pagelist = temp_pagelist;
 958
 959         dma->buf_count += entry->buf_count;
 960         dma->seg_count += entry->seg_count;
 961         dma->page_count += entry->seg_count << page_order;
 962         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 963
 964         mutex_unlock(&dev->struct_mutex);
 965
 966         request->count = entry->buf_count;
 967         request->size = size;
 968
 969         if (request->flags & _DRM_PCI_BUFFER_RO)
 970                 dma->flags = _DRM_DMA_USE_PCI_RO;
 971
 972         atomic_dec(&dev->buf_alloc);
 973         return 0;
 974
 975 }
 976 EXPORT_SYMBOL(drm_addbufs_pci);
 977
 978 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 979 {
 980         struct drm_device_dma *dma = dev->dma;
 981         struct drm_buf_entry *entry;
 982         struct drm_buf *buf;
 983         unsigned long offset;
 984         unsigned long agp_offset;
 985         int count;
 986         int order;
 987         int size;
 988         int alignment;
 989         int page_order;
 990         int total;
 991         int byte_count;
 992         int i;
 993         struct drm_buf **temp_buflist;
 994
 995         if (!drm_core_check_feature(dev, DRIVER_SG))
 996                 return -EINVAL;
 997
 998         if (!dma)
 999                 return -EINVAL;
1000
1001         if (!capable(CAP_SYS_ADMIN))
1002                 return -EPERM;
1003
1004         count = request->count;
1005         order = drm_order(request->size);
1006         size = 1 << order;
1007
1008         alignment = (request->flags & _DRM_PAGE_ALIGN)
1009             ? PAGE_ALIGN(size) : size;
1010         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1011         total = PAGE_SIZE << page_order;
1012
1013         byte_count = 0;
1014         agp_offset = request->agp_start;
1015
1016         DRM_DEBUG("count:      %d\n", count);
1017         DRM_DEBUG("order:      %d\n", order);
1018         DRM_DEBUG("size:       %d\n", size);
1019         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1020         DRM_DEBUG("alignment:  %d\n", alignment);
1021         DRM_DEBUG("page_order: %d\n", page_order);
1022         DRM_DEBUG("total:      %d\n", total);
1023
1024         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1025                 return -EINVAL;
1026         if (dev->queue_count)
1027                 return -EBUSY;  /* Not while in use */
1028
1029         spin_lock(&dev->count_lock);
1030         if (dev->buf_use) {
1031                 spin_unlock(&dev->count_lock);
1032                 return -EBUSY;
1033         }
1034         atomic_inc(&dev->buf_alloc);
1035         spin_unlock(&dev->count_lock);
1036
1037         mutex_lock(&dev->struct_mutex);
1038         entry = &dma->bufs[order];
1039         if (entry->buf_count) {
1040                 mutex_unlock(&dev->struct_mutex);
1041                 atomic_dec(&dev->buf_alloc);
1042                 return -ENOMEM; /* May only call once for each order */
1043         }
1044
1045         if (count < 0 || count > 4096) {
1046                 mutex_unlock(&dev->struct_mutex);
1047                 atomic_dec(&dev->buf_alloc);
1048                 return -EINVAL;
1049         }
1050
1051         entry->buflist = kmalloc(count * sizeof(*entry->buflist),
1052                                 GFP_KERNEL);
1053         if (!entry->buflist) {
1054                 mutex_unlock(&dev->struct_mutex);
1055                 atomic_dec(&dev->buf_alloc);
1056                 return -ENOMEM;
1057         }
1058         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1059
1060         entry->buf_size = size;
1061         entry->page_order = page_order;
1062
1063         offset = 0;
1064
1065         while (entry->buf_count < count) {
1066                 buf = &entry->buflist[entry->buf_count];
1067                 buf->idx = dma->buf_count + entry->buf_count;
1068                 buf->total = alignment;
1069                 buf->order = order;
1070                 buf->used = 0;
1071
1072                 buf->offset = (dma->byte_count + offset);
1073                 buf->bus_address = agp_offset + offset;
1074                 buf->address = (void *)(agp_offset + offset
1075                                         + (unsigned long)dev->sg->virtual);
1076                 buf->next = NULL;
1077                 buf->waiting = 0;
1078                 buf->pending = 0;
1079                 init_waitqueue_head(&buf->dma_wait);
1080                 buf->file_priv = NULL;
1081
1082                 buf->dev_priv_size = dev->driver->dev_priv_size;
1083                 buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL);
1084                 if (!buf->dev_private) {
1085                         /* Set count correctly so we free the proper amount. */
1086                         entry->buf_count = count;
1087                         drm_cleanup_buf_error(dev, entry);
1088                         mutex_unlock(&dev->struct_mutex);
1089                         atomic_dec(&dev->buf_alloc);
1090                         return -ENOMEM;
1091                 }
1092
1093                 memset(buf->dev_private, 0, buf->dev_priv_size);
1094
1095                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1096
1097                 offset += alignment;
1098                 entry->buf_count++;
1099                 byte_count += PAGE_SIZE << page_order;
1100         }
1101
1102         DRM_DEBUG("byte_count: %d\n", byte_count);
1103
1104         temp_buflist = krealloc(dma->buflist,
1105                                 (dma->buf_count + entry->buf_count) *
1106                                 sizeof(*dma->buflist), GFP_KERNEL);
1107         if (!temp_buflist) {
1108                 /* Free the entry because it isn't valid */
1109                 drm_cleanup_buf_error(dev, entry);
1110                 mutex_unlock(&dev->struct_mutex);
1111                 atomic_dec(&dev->buf_alloc);
1112                 return -ENOMEM;
1113         }
1114         dma->buflist = temp_buflist;
1115
1116         for (i = 0; i < entry->buf_count; i++) {
1117                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1118         }
1119
1120         dma->buf_count += entry->buf_count;
1121         dma->seg_count += entry->seg_count;
1122         dma->page_count += byte_count >> PAGE_SHIFT;
1123         dma->byte_count += byte_count;
1124
1125         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1126         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1127
1128         mutex_unlock(&dev->struct_mutex);
1129
1130         request->count = entry->buf_count;
1131         request->size = size;
1132
1133         dma->flags = _DRM_DMA_USE_SG;
1134
1135         atomic_dec(&dev->buf_alloc);
1136         return 0;
1137 }
1138
1139 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1140 {
1141         struct drm_device_dma *dma = dev->dma;
1142         struct drm_buf_entry *entry;
1143         struct drm_buf *buf;
1144         unsigned long offset;
1145         unsigned long agp_offset;
1146         int count;
1147         int order;
1148         int size;
1149         int alignment;
1150         int page_order;
1151         int total;
1152         int byte_count;
1153         int i;
1154         struct drm_buf **temp_buflist;
1155
1156         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1157                 return -EINVAL;
1158
1159         if (!dma)
1160                 return -EINVAL;
1161
1162         if (!capable(CAP_SYS_ADMIN))
1163                 return -EPERM;
1164
1165         count = request->count;
1166         order = drm_order(request->size);
1167         size = 1 << order;
1168
1169         alignment = (request->flags & _DRM_PAGE_ALIGN)
1170             ? PAGE_ALIGN(size) : size;
1171         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1172         total = PAGE_SIZE << page_order;
1173
1174         byte_count = 0;
1175         agp_offset = request->agp_start;
1176
1177         DRM_DEBUG("count:      %d\n", count);
1178         DRM_DEBUG("order:      %d\n", order);
1179         DRM_DEBUG("size:       %d\n", size);
1180         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1181         DRM_DEBUG("alignment:  %d\n", alignment);
1182         DRM_DEBUG("page_order: %d\n", page_order);
1183         DRM_DEBUG("total:      %d\n", total);
1184
1185         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1186                 return -EINVAL;
1187         if (dev->queue_count)
1188                 return -EBUSY;  /* Not while in use */
1189
1190         spin_lock(&dev->count_lock);
1191         if (dev->buf_use) {
1192                 spin_unlock(&dev->count_lock);
1193                 return -EBUSY;
1194         }
1195         atomic_inc(&dev->buf_alloc);
1196         spin_unlock(&dev->count_lock);
1197
1198         mutex_lock(&dev->struct_mutex);
1199         entry = &dma->bufs[order];
1200         if (entry->buf_count) {
1201                 mutex_unlock(&dev->struct_mutex);
1202                 atomic_dec(&dev->buf_alloc);
1203                 return -ENOMEM; /* May only call once for each order */
1204         }
1205
1206         if (count < 0 || count > 4096) {
1207                 mutex_unlock(&dev->struct_mutex);
1208                 atomic_dec(&dev->buf_alloc);
1209                 return -EINVAL;
1210         }
1211
1212         entry->buflist = kmalloc(count * sizeof(*entry->buflist),
1213                                 GFP_KERNEL);
1214         if (!entry->buflist) {
1215                 mutex_unlock(&dev->struct_mutex);
1216                 atomic_dec(&dev->buf_alloc);
1217                 return -ENOMEM;
1218         }
1219         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1220
1221         entry->buf_size = size;
1222         entry->page_order = page_order;
1223
1224         offset = 0;
1225
1226         while (entry->buf_count < count) {
1227                 buf = &entry->buflist[entry->buf_count];
1228                 buf->idx = dma->buf_count + entry->buf_count;
1229                 buf->total = alignment;
1230                 buf->order = order;
1231                 buf->used = 0;
1232
1233                 buf->offset = (dma->byte_count + offset);
1234                 buf->bus_address = agp_offset + offset;
1235                 buf->address = (void *)(agp_offset + offset);
1236                 buf->next = NULL;
1237                 buf->waiting = 0;
1238                 buf->pending = 0;
1239                 init_waitqueue_head(&buf->dma_wait);
1240                 buf->file_priv = NULL;
1241
1242                 buf->dev_priv_size = dev->driver->dev_priv_size;
1243                 buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL);
1244                 if (!buf->dev_private) {
1245                         /* Set count correctly so we free the proper amount. */
1246                         entry->buf_count = count;
1247                         drm_cleanup_buf_error(dev, entry);
1248                         mutex_unlock(&dev->struct_mutex);
1249                         atomic_dec(&dev->buf_alloc);
1250                         return -ENOMEM;
1251                 }
1252                 memset(buf->dev_private, 0, buf->dev_priv_size);
1253
1254                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1255
1256                 offset += alignment;
1257                 entry->buf_count++;
1258                 byte_count += PAGE_SIZE << page_order;
1259         }
1260
1261         DRM_DEBUG("byte_count: %d\n", byte_count);
1262
1263         temp_buflist = krealloc(dma->buflist,
1264                                 (dma->buf_count + entry->buf_count) *
1265                                 sizeof(*dma->buflist), GFP_KERNEL);
1266         if (!temp_buflist) {
1267                 /* Free the entry because it isn't valid */
1268                 drm_cleanup_buf_error(dev, entry);
1269                 mutex_unlock(&dev->struct_mutex);
1270                 atomic_dec(&dev->buf_alloc);
1271                 return -ENOMEM;
1272         }
1273         dma->buflist = temp_buflist;
1274
1275         for (i = 0; i < entry->buf_count; i++) {
1276                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1277         }
1278
1279         dma->buf_count += entry->buf_count;
1280         dma->seg_count += entry->seg_count;
1281         dma->page_count += byte_count >> PAGE_SHIFT;
1282         dma->byte_count += byte_count;
1283
1284         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1285         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1286
1287         mutex_unlock(&dev->struct_mutex);
1288
1289         request->count = entry->buf_count;
1290         request->size = size;
1291
1292         dma->flags = _DRM_DMA_USE_FB;
1293
1294         atomic_dec(&dev->buf_alloc);
1295         return 0;
1296 }
1297
1298
1299 /**
1300  * Add buffers for DMA transfers (ioctl).
1301  *
1302  * \param inode device inode.
1303  * \param file_priv DRM file private.
1304  * \param cmd command.
1305  * \param arg pointer to a struct drm_buf_desc request.
1306  * \return zero on success or a negative number on failure.
1307  *
1308  * According with the memory type specified in drm_buf_desc::flags and the
1309  * build options, it dispatches the call either to addbufs_agp(),
1310  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1311  * PCI memory respectively.
1312  */
1313 int drm_addbufs(struct drm_device *dev, void *data,
1314                 struct drm_file *file_priv)
1315 {
1316         struct drm_buf_desc *request = data;
1317         int ret;
1318
1319         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1320                 return -EINVAL;
1321
1322 #if __OS_HAS_AGP
1323         if (request->flags & _DRM_AGP_BUFFER)
1324                 ret = drm_addbufs_agp(dev, request);
1325         else
1326 #endif
1327         if (request->flags & _DRM_SG_BUFFER)
1328                 ret = drm_addbufs_sg(dev, request);
1329         else if (request->flags & _DRM_FB_BUFFER)
1330                 ret = drm_addbufs_fb(dev, request);
1331         else
1332                 ret = drm_addbufs_pci(dev, request);
1333
1334         return ret;
1335 }
1336
1337 /**
1338  * Get information about the buffer mappings.
1339  *
1340  * This was originally mean for debugging purposes, or by a sophisticated
1341  * client library to determine how best to use the available buffers (e.g.,
1342  * large buffers can be used for image transfer).
1343  *
1344  * \param inode device inode.
1345  * \param file_priv DRM file private.
1346  * \param cmd command.
1347  * \param arg pointer to a drm_buf_info structure.
1348  * \return zero on success or a negative number on failure.
1349  *
1350  * Increments drm_device::buf_use while holding the drm_device::count_lock
1351  * lock, preventing of allocating more buffers after this call. Information
1352  * about each requested buffer is then copied into user space.
1353  */
1354 int drm_infobufs(struct drm_device *dev, void *data,
1355                  struct drm_file *file_priv)
1356 {
1357         struct drm_device_dma *dma = dev->dma;
1358         struct drm_buf_info *request = data;
1359         int i;
1360         int count;
1361
1362         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1363                 return -EINVAL;
1364
1365         if (!dma)
1366                 return -EINVAL;
1367
1368         spin_lock(&dev->count_lock);
1369         if (atomic_read(&dev->buf_alloc)) {
1370                 spin_unlock(&dev->count_lock);
1371                 return -EBUSY;
1372         }
1373         ++dev->buf_use;         /* Can't allocate more after this call */
1374         spin_unlock(&dev->count_lock);
1375
1376         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1377                 if (dma->bufs[i].buf_count)
1378                         ++count;
1379         }
1380
1381         DRM_DEBUG("count = %d\n", count);
1382
1383         if (request->count >= count) {
1384                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1385                         if (dma->bufs[i].buf_count) {
1386                                 struct drm_buf_desc __user *to =
1387                                     &request->list[count];
1388                                 struct drm_buf_entry *from = &dma->bufs[i];
1389                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1390                                 if (copy_to_user(&to->count,
1391                                                  &from->buf_count,
1392                                                  sizeof(from->buf_count)) ||
1393                                     copy_to_user(&to->size,
1394                                                  &from->buf_size,
1395                                                  sizeof(from->buf_size)) ||
1396                                     copy_to_user(&to->low_mark,
1397                                                  &list->low_mark,
1398                                                  sizeof(list->low_mark)) ||
1399                                     copy_to_user(&to->high_mark,
1400                                                  &list->high_mark,
1401                                                  sizeof(list->high_mark)))
1402                                         return -EFAULT;
1403
1404                                 DRM_DEBUG("%d %d %d %d %d\n",
1405                                           i,
1406                                           dma->bufs[i].buf_count,
1407                                           dma->bufs[i].buf_size,
1408                                           dma->bufs[i].freelist.low_mark,
1409                                           dma->bufs[i].freelist.high_mark);
1410                                 ++count;
1411                         }
1412                 }
1413         }
1414         request->count = count;
1415
1416         return 0;
1417 }
1418
1419 /**
1420  * Specifies a low and high water mark for buffer allocation
1421  *
1422  * \param inode device inode.
1423  * \param file_priv DRM file private.
1424  * \param cmd command.
1425  * \param arg a pointer to a drm_buf_desc structure.
1426  * \return zero on success or a negative number on failure.
1427  *
1428  * Verifies that the size order is bounded between the admissible orders and
1429  * updates the respective drm_device_dma::bufs entry low and high water mark.
1430  *
1431  * \note This ioctl is deprecated and mostly never used.
1432  */
1433 int drm_markbufs(struct drm_device *dev, void *data,
1434                  struct drm_file *file_priv)
1435 {
1436         struct drm_device_dma *dma = dev->dma;
1437         struct drm_buf_desc *request = data;
1438         int order;
1439         struct drm_buf_entry *entry;
1440
1441         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1442                 return -EINVAL;
1443
1444         if (!dma)
1445                 return -EINVAL;
1446
1447         DRM_DEBUG("%d, %d, %d\n",
1448                   request->size, request->low_mark, request->high_mark);
1449         order = drm_order(request->size);
1450         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1451                 return -EINVAL;
1452         entry = &dma->bufs[order];
1453
1454         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1455                 return -EINVAL;
1456         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1457                 return -EINVAL;
1458
1459         entry->freelist.low_mark = request->low_mark;
1460         entry->freelist.high_mark = request->high_mark;
1461
1462         return 0;
1463 }
1464
1465 /**
1466  * Unreserve the buffers in list, previously reserved using drmDMA.
1467  *
1468  * \param inode device inode.
1469  * \param file_priv DRM file private.
1470  * \param cmd command.
1471  * \param arg pointer to a drm_buf_free structure.
1472  * \return zero on success or a negative number on failure.
1473  *
1474  * Calls free_buffer() for each used buffer.
1475  * This function is primarily used for debugging.
1476  */
1477 int drm_freebufs(struct drm_device *dev, void *data,
1478                  struct drm_file *file_priv)
1479 {
1480         struct drm_device_dma *dma = dev->dma;
1481         struct drm_buf_free *request = data;
1482         int i;
1483         int idx;
1484         struct drm_buf *buf;
1485
1486         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1487                 return -EINVAL;
1488
1489         if (!dma)
1490                 return -EINVAL;
1491
1492         DRM_DEBUG("%d\n", request->count);
1493         for (i = 0; i < request->count; i++) {
1494                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1495                         return -EFAULT;
1496                 if (idx < 0 || idx >= dma->buf_count) {
1497                         DRM_ERROR("Index %d (of %d max)\n",
1498                                   idx, dma->buf_count - 1);
1499                         return -EINVAL;
1500                 }
1501                 buf = dma->buflist[idx];
1502                 if (buf->file_priv != file_priv) {
1503                         DRM_ERROR("Process %d freeing buffer not owned\n",
1504                                   task_pid_nr(current));
1505                         return -EINVAL;
1506                 }
1507                 drm_free_buffer(dev, buf);
1508         }
1509
1510         return 0;
1511 }
1512
1513 /**
1514  * Maps all of the DMA buffers into client-virtual space (ioctl).
1515  *
1516  * \param inode device inode.
1517  * \param file_priv DRM file private.
1518  * \param cmd command.
1519  * \param arg pointer to a drm_buf_map structure.
1520  * \return zero on success or a negative number on failure.
1521  *
1522  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1523  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1524  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1525  * drm_mmap_dma().
1526  */
1527 int drm_mapbufs(struct drm_device *dev, void *data,
1528                 struct drm_file *file_priv)
1529 {
1530         struct drm_device_dma *dma = dev->dma;
1531         int retcode = 0;
1532         const int zero = 0;
1533         unsigned long virtual;
1534         unsigned long address;
1535         struct drm_buf_map *request = data;
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 (request->count >= dma->buf_count) {
1553                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1554                     || (drm_core_check_feature(dev, DRIVER_SG)
1555                         && (dma->flags & _DRM_DMA_USE_SG))
1556                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1557                         && (dma->flags & _DRM_DMA_USE_FB))) {
1558                         struct drm_local_map *map = dev->agp_buffer_map;
1559                         unsigned long token = dev->agp_buffer_token;
1560
1561                         if (!map) {
1562                                 retcode = -EINVAL;
1563                                 goto done;
1564                         }
1565                         down_write(&current->mm->mmap_sem);
1566                         virtual = do_mmap(file_priv->filp, 0, map->size,
1567                                           PROT_READ | PROT_WRITE,
1568                                           MAP_SHARED,
1569                                           token);
1570                         up_write(&current->mm->mmap_sem);
1571                 } else {
1572                         down_write(&current->mm->mmap_sem);
1573                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1574                                           PROT_READ | PROT_WRITE,
1575                                           MAP_SHARED, 0);
1576                         up_write(&current->mm->mmap_sem);
1577                 }
1578                 if (virtual > -1024UL) {
1579                         /* Real error */
1580                         retcode = (signed long)virtual;
1581                         goto done;
1582                 }
1583                 request->virtual = (void __user *)virtual;
1584
1585                 for (i = 0; i < dma->buf_count; i++) {
1586                         if (copy_to_user(&request->list[i].idx,
1587                                          &dma->buflist[i]->idx,
1588                                          sizeof(request->list[0].idx))) {
1589                                 retcode = -EFAULT;
1590                                 goto done;
1591                         }
1592                         if (copy_to_user(&request->list[i].total,
1593                                          &dma->buflist[i]->total,
1594                                          sizeof(request->list[0].total))) {
1595                                 retcode = -EFAULT;
1596                                 goto done;
1597                         }
1598                         if (copy_to_user(&request->list[i].used,
1599                                          &zero, sizeof(zero))) {
1600                                 retcode = -EFAULT;
1601                                 goto done;
1602                         }
1603                         address = virtual + dma->buflist[i]->offset;    /* *** */
1604                         if (copy_to_user(&request->list[i].address,
1605                                          &address, sizeof(address))) {
1606                                 retcode = -EFAULT;
1607                                 goto done;
1608                         }
1609                 }
1610         }
1611       done:
1612         request->count = dma->buf_count;
1613         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1614
1615         return retcode;
1616 }
1617
1618 /**
1619  * Compute size order.  Returns the exponent of the smaller power of two which
1620  * is greater or equal to given number.
1621  *
1622  * \param size size.
1623  * \return order.
1624  *
1625  * \todo Can be made faster.
1626  */
1627 int drm_order(unsigned long size)
1628 {
1629         int order;
1630         unsigned long tmp;
1631
1632         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1633
1634         if (size & (size - 1))
1635                 ++order;
1636
1637         return order;
1638 }
1639 EXPORT_SYMBOL(drm_order);