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/log2.h>
  38 #include <asm/shmparam.h>
  39 #include "drmP.h"
  40
  41 resource_size_t drm_get_resource_start(struct drm_device *dev, unsigned int resource)
  42 {
  43         return pci_resource_start(dev->pdev, resource);
  44 }
  45 EXPORT_SYMBOL(drm_get_resource_start);
  46
  47 resource_size_t drm_get_resource_len(struct drm_device *dev, unsigned int resource)
  48 {
  49         return pci_resource_len(dev->pdev, resource);
  50 }
  51
  52 EXPORT_SYMBOL(drm_get_resource_len);
  53
  54 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
  55                                                   struct drm_local_map *map)
  56 {
  57         struct drm_map_list *entry;
  58         list_for_each_entry(entry, &dev->maplist, head) {
  59                 /*
  60                  * Because the kernel-userspace ABI is fixed at a 32-bit offset
  61                  * while PCI resources may live above that, we ignore the map
  62                  * offset for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.
  63                  * It is assumed that each driver will have only one resource of
  64                  * each type.
  65                  */
  66                 if (!entry->map ||
  67                     map->type != entry->map->type ||
  68                     entry->master != dev->primary->master)
  69                         continue;
  70                 switch (map->type) {
  71                 case _DRM_SHM:
  72                         if (map->flags != _DRM_CONTAINS_LOCK)
  73                                 break;
  74                 case _DRM_REGISTERS:
  75                 case _DRM_FRAME_BUFFER:
  76                         return entry;
  77                 default: /* Make gcc happy */
  78                         ;
  79                 }
  80                 if (entry->map->offset == map->offset)
  81                         return entry;
  82         }
  83
  84         return NULL;
  85 }
  86
  87 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
  88                           unsigned long user_token, int hashed_handle, int shm)
  89 {
  90         int use_hashed_handle, shift;
  91         unsigned long add;
  92
  93 #if (BITS_PER_LONG == 64)
  94         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  95 #elif (BITS_PER_LONG == 32)
  96         use_hashed_handle = hashed_handle;
  97 #else
  98 #error Unsupported long size. Neither 64 nor 32 bits.
  99 #endif
 100
 101         if (!use_hashed_handle) {
 102                 int ret;
 103                 hash->key = user_token >> PAGE_SHIFT;
 104                 ret = drm_ht_insert_item(&dev->map_hash, hash);
 105                 if (ret != -EINVAL)
 106                         return ret;
 107         }
 108
 109         shift = 0;
 110         add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
 111         if (shm && (SHMLBA > PAGE_SIZE)) {
 112                 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
 113
 114                 /* For shared memory, we have to preserve the SHMLBA
 115                  * bits of the eventual vma->vm_pgoff value during
 116                  * mmap().  Otherwise we run into cache aliasing problems
 117                  * on some platforms.  On these platforms, the pgoff of
 118                  * a mmap() request is used to pick a suitable virtual
 119                  * address for the mmap() region such that it will not
 120                  * cause cache aliasing problems.
 121                  *
 122                  * Therefore, make sure the SHMLBA relevant bits of the
 123                  * hash value we use are equal to those in the original
 124                  * kernel virtual address.
 125                  */
 126                 shift = bits;
 127                 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
 128         }
 129
 130         return drm_ht_just_insert_please(&dev->map_hash, hash,
 131                                          user_token, 32 - PAGE_SHIFT - 3,
 132                                          shift, add);
 133 }
 134
 135 /**
 136  * Core function to create a range of memory available for mapping by a
 137  * non-root process.
 138  *
 139  * Adjusts the memory offset to its absolute value according to the mapping
 140  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 141  * applicable and if supported by the kernel.
 142  */
 143 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
 144                            unsigned int size, enum drm_map_type type,
 145                            enum drm_map_flags flags,
 146                            struct drm_map_list ** maplist)
 147 {
 148         struct drm_local_map *map;
 149         struct drm_map_list *list;
 150         drm_dma_handle_t *dmah;
 151         unsigned long user_token;
 152         int ret;
 153
 154         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
 155         if (!map)
 156                 return -ENOMEM;
 157
 158         map->offset = offset;
 159         map->size = size;
 160         map->flags = flags;
 161         map->type = type;
 162
 163         /* Only allow shared memory to be removable since we only keep enough
 164          * book keeping information about shared memory to allow for removal
 165          * when processes fork.
 166          */
 167         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 168                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 169                 return -EINVAL;
 170         }
 171         DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
 172                   (unsigned long long)map->offset, map->size, map->type);
 173         if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 174                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 175                 return -EINVAL;
 176         }
 177         map->mtrr = -1;
 178         map->handle = NULL;
 179
 180         switch (map->type) {
 181         case _DRM_REGISTERS:
 182         case _DRM_FRAME_BUFFER:
 183 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 184                 if (map->offset + (map->size-1) < map->offset ||
 185                     map->offset < virt_to_phys(high_memory)) {
 186                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 187                         return -EINVAL;
 188                 }
 189 #endif
 190 #ifdef __alpha__
 191                 map->offset += dev->hose->mem_space->start;
 192 #endif
 193                 /* Some drivers preinitialize some maps, without the X Server
 194                  * needing to be aware of it.  Therefore, we just return success
 195                  * when the server tries to create a duplicate map.
 196                  */
 197                 list = drm_find_matching_map(dev, map);
 198                 if (list != NULL) {
 199                         if (list->map->size != map->size) {
 200                                 DRM_DEBUG("Matching maps of type %d with "
 201                                           "mismatched sizes, (%ld vs %ld)\n",
 202                                           map->type, map->size,
 203                                           list->map->size);
 204                                 list->map->size = map->size;
 205                         }
 206
 207                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 208                         *maplist = list;
 209                         return 0;
 210                 }
 211
 212                 if (drm_core_has_MTRR(dev)) {
 213                         if (map->type == _DRM_FRAME_BUFFER ||
 214                             (map->flags & _DRM_WRITE_COMBINING)) {
 215                                 map->mtrr = mtrr_add(map->offset, map->size,
 216                                                      MTRR_TYPE_WRCOMB, 1);
 217                         }
 218                 }
 219                 if (map->type == _DRM_REGISTERS) {
 220                         map->handle = ioremap(map->offset, map->size);
 221                         if (!map->handle) {
 222                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 223                                 return -ENOMEM;
 224                         }
 225                 }
 226
 227                 break;
 228         case _DRM_SHM:
 229                 list = drm_find_matching_map(dev, map);
 230                 if (list != NULL) {
 231                         if(list->map->size != map->size) {
 232                                 DRM_DEBUG("Matching maps of type %d with "
 233                                           "mismatched sizes, (%ld vs %ld)\n",
 234                                           map->type, map->size, list->map->size);
 235                                 list->map->size = map->size;
 236                         }
 237
 238                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 239                         *maplist = list;
 240                         return 0;
 241                 }
 242                 map->handle = vmalloc_user(map->size);
 243                 DRM_DEBUG("%lu %d %p\n",
 244                           map->size, drm_order(map->size), map->handle);
 245                 if (!map->handle) {
 246                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 247                         return -ENOMEM;
 248                 }
 249                 map->offset = (unsigned long)map->handle;
 250                 if (map->flags & _DRM_CONTAINS_LOCK) {
 251                         /* Prevent a 2nd X Server from creating a 2nd lock */
 252                         if (dev->primary->master->lock.hw_lock != NULL) {
 253                                 vfree(map->handle);
 254                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 255                                 return -EBUSY;
 256                         }
 257                         dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle;   /* Pointer to lock */
 258                 }
 259                 break;
 260         case _DRM_AGP: {
 261                 struct drm_agp_mem *entry;
 262                 int valid = 0;
 263
 264                 if (!drm_core_has_AGP(dev)) {
 265                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 266                         return -EINVAL;
 267                 }
 268 #ifdef __alpha__
 269                 map->offset += dev->hose->mem_space->start;
 270 #endif
 271                 /* In some cases (i810 driver), user space may have already
 272                  * added the AGP base itself, because dev->agp->base previously
 273                  * only got set during AGP enable.  So, only add the base
 274                  * address if the map's offset isn't already within the
 275                  * aperture.
 276                  */
 277                 if (map->offset < dev->agp->base ||
 278                     map->offset > dev->agp->base +
 279                     dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
 280                         map->offset += dev->agp->base;
 281                 }
 282                 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 283
 284                 /* This assumes the DRM is in total control of AGP space.
 285                  * It's not always the case as AGP can be in the control
 286                  * of user space (i.e. i810 driver). So this loop will get
 287                  * skipped and we double check that dev->agp->memory is
 288                  * actually set as well as being invalid before EPERM'ing
 289                  */
 290                 list_for_each_entry(entry, &dev->agp->memory, head) {
 291                         if ((map->offset >= entry->bound) &&
 292                             (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
 293                                 valid = 1;
 294                                 break;
 295                         }
 296                 }
 297                 if (!list_empty(&dev->agp->memory) && !valid) {
 298                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 299                         return -EPERM;
 300                 }
 301                 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
 302                           (unsigned long long)map->offset, map->size);
 303
 304                 break;
 305         case _DRM_GEM:
 306                 DRM_ERROR("tried to rmmap GEM object\n");
 307                 break;
 308         }
 309         case _DRM_SCATTER_GATHER:
 310                 if (!dev->sg) {
 311                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 312                         return -EINVAL;
 313                 }
 314                 map->offset += (unsigned long)dev->sg->virtual;
 315                 break;
 316         case _DRM_CONSISTENT:
 317                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 318                  * As we're limiting the address to 2^32-1 (or less),
 319                  * casting it down to 32 bits is no problem, but we
 320                  * need to point to a 64bit variable first. */
 321                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 322                 if (!dmah) {
 323                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 324                         return -ENOMEM;
 325                 }
 326                 map->handle = dmah->vaddr;
 327                 map->offset = (unsigned long)dmah->busaddr;
 328                 kfree(dmah);
 329                 break;
 330         default:
 331                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 332                 return -EINVAL;
 333         }
 334
 335         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 336         if (!list) {
 337                 if (map->type == _DRM_REGISTERS)
 338                         iounmap(map->handle);
 339                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 340                 return -EINVAL;
 341         }
 342         memset(list, 0, sizeof(*list));
 343         list->map = map;
 344
 345         mutex_lock(&dev->struct_mutex);
 346         list_add(&list->head, &dev->maplist);
 347
 348         /* Assign a 32-bit handle */
 349         /* We do it here so that dev->struct_mutex protects the increment */
 350         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 351                 map->offset;
 352         ret = drm_map_handle(dev, &list->hash, user_token, 0,
 353                              (map->type == _DRM_SHM));
 354         if (ret) {
 355                 if (map->type == _DRM_REGISTERS)
 356                         iounmap(map->handle);
 357                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 358                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 359                 mutex_unlock(&dev->struct_mutex);
 360                 return ret;
 361         }
 362
 363         list->user_token = list->hash.key << PAGE_SHIFT;
 364         mutex_unlock(&dev->struct_mutex);
 365
 366         list->master = dev->primary->master;
 367         *maplist = list;
 368         return 0;
 369         }
 370
 371 int drm_addmap(struct drm_device * dev, resource_size_t offset,
 372                unsigned int size, enum drm_map_type type,
 373                enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 374 {
 375         struct drm_map_list *list;
 376         int rc;
 377
 378         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 379         if (!rc)
 380                 *map_ptr = list->map;
 381         return rc;
 382 }
 383
 384 EXPORT_SYMBOL(drm_addmap);
 385
 386 /**
 387  * Ioctl to specify a range of memory that is available for mapping by a
 388  * non-root process.
 389  *
 390  * \param inode device inode.
 391  * \param file_priv DRM file private.
 392  * \param cmd command.
 393  * \param arg pointer to a drm_map structure.
 394  * \return zero on success or a negative value on error.
 395  *
 396  */
 397 int drm_addmap_ioctl(struct drm_device *dev, void *data,
 398                      struct drm_file *file_priv)
 399 {
 400         struct drm_map *map = data;
 401         struct drm_map_list *maplist;
 402         int err;
 403
 404         if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 405                 return -EPERM;
 406
 407         err = drm_addmap_core(dev, map->offset, map->size, map->type,
 408                               map->flags, &maplist);
 409
 410         if (err)
 411                 return err;
 412
 413         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 414         map->handle = (void *)(unsigned long)maplist->user_token;
 415         return 0;
 416 }
 417
 418 /**
 419  * Remove a map private from list and deallocate resources if the mapping
 420  * isn't in use.
 421  *
 422  * Searches the map on drm_device::maplist, removes it from the list, see if
 423  * its being used, and free any associate resource (such as MTRR's) if it's not
 424  * being on use.
 425  *
 426  * \sa drm_addmap
 427  */
 428 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 429 {
 430         struct drm_map_list *r_list = NULL, *list_t;
 431         drm_dma_handle_t dmah;
 432         int found = 0;
 433         struct drm_master *master;
 434
 435         /* Find the list entry for the map and remove it */
 436         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 437                 if (r_list->map == map) {
 438                         master = r_list->master;
 439                         list_del(&r_list->head);
 440                         drm_ht_remove_key(&dev->map_hash,
 441                                           r_list->user_token >> PAGE_SHIFT);
 442                         drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
 443                         found = 1;
 444                         break;
 445                 }
 446         }
 447
 448         if (!found)
 449                 return -EINVAL;
 450
 451         switch (map->type) {
 452         case _DRM_REGISTERS:
 453                 iounmap(map->handle);
 454                 /* FALLTHROUGH */
 455         case _DRM_FRAME_BUFFER:
 456                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 457                         int retcode;
 458                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 459                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 460                 }
 461                 break;
 462         case _DRM_SHM:
 463                 vfree(map->handle);
 464                 if (master) {
 465                         if (dev->sigdata.lock == master->lock.hw_lock)
 466                                 dev->sigdata.lock = NULL;
 467                         master->lock.hw_lock = NULL;   /* SHM removed */
 468                         master->lock.file_priv = NULL;
 469                         wake_up_interruptible_all(&master->lock.lock_queue);
 470                 }
 471                 break;
 472         case _DRM_AGP:
 473         case _DRM_SCATTER_GATHER:
 474                 break;
 475         case _DRM_CONSISTENT:
 476                 dmah.vaddr = map->handle;
 477                 dmah.busaddr = map->offset;
 478                 dmah.size = map->size;
 479                 __drm_pci_free(dev, &dmah);
 480                 break;
 481         case _DRM_GEM:
 482                 DRM_ERROR("tried to rmmap GEM object\n");
 483                 break;
 484         }
 485         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 486
 487         return 0;
 488 }
 489 EXPORT_SYMBOL(drm_rmmap_locked);
 490
 491 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 492 {
 493         int ret;
 494
 495         mutex_lock(&dev->struct_mutex);
 496         ret = drm_rmmap_locked(dev, map);
 497         mutex_unlock(&dev->struct_mutex);
 498
 499         return ret;
 500 }
 501 EXPORT_SYMBOL(drm_rmmap);
 502
 503 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 504  * the last close of the device, and this is necessary for cleanup when things
 505  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 506  * like a pointless exercise since they're going away anyway.
 507  *
 508  * One use case might be after addmap is allowed for normal users for SHM and
 509  * gets used by drivers that the server doesn't need to care about.  This seems
 510  * unlikely.
 511  *
 512  * \param inode device inode.
 513  * \param file_priv DRM file private.
 514  * \param cmd command.
 515  * \param arg pointer to a struct drm_map structure.
 516  * \return zero on success or a negative value on error.
 517  */
 518 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 519                     struct drm_file *file_priv)
 520 {
 521         struct drm_map *request = data;
 522         struct drm_local_map *map = NULL;
 523         struct drm_map_list *r_list;
 524         int ret;
 525
 526         mutex_lock(&dev->struct_mutex);
 527         list_for_each_entry(r_list, &dev->maplist, head) {
 528                 if (r_list->map &&
 529                     r_list->user_token == (unsigned long)request->handle &&
 530                     r_list->map->flags & _DRM_REMOVABLE) {
 531                         map = r_list->map;
 532                         break;
 533                 }
 534         }
 535
 536         /* List has wrapped around to the head pointer, or its empty we didn't
 537          * find anything.
 538          */
 539         if (list_empty(&dev->maplist) || !map) {
 540                 mutex_unlock(&dev->struct_mutex);
 541                 return -EINVAL;
 542         }
 543
 544         /* Register and framebuffer maps are permanent */
 545         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 546                 mutex_unlock(&dev->struct_mutex);
 547                 return 0;
 548         }
 549
 550         ret = drm_rmmap_locked(dev, map);
 551
 552         mutex_unlock(&dev->struct_mutex);
 553
 554         return ret;
 555 }
 556
 557 /**
 558  * Cleanup after an error on one of the addbufs() functions.
 559  *
 560  * \param dev DRM device.
 561  * \param entry buffer entry where the error occurred.
 562  *
 563  * Frees any pages and buffers associated with the given entry.
 564  */
 565 static void drm_cleanup_buf_error(struct drm_device * dev,
 566                                   struct drm_buf_entry * entry)
 567 {
 568         int i;
 569
 570         if (entry->seg_count) {
 571                 for (i = 0; i < entry->seg_count; i++) {
 572                         if (entry->seglist[i]) {
 573                                 drm_pci_free(dev, entry->seglist[i]);
 574                         }
 575                 }
 576                 drm_free(entry->seglist,
 577                          entry->seg_count *
 578                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 579
 580                 entry->seg_count = 0;
 581         }
 582
 583         if (entry->buf_count) {
 584                 for (i = 0; i < entry->buf_count; i++) {
 585                         if (entry->buflist[i].dev_private) {
 586                                 drm_free(entry->buflist[i].dev_private,
 587                                          entry->buflist[i].dev_priv_size,
 588                                          DRM_MEM_BUFS);
 589                         }
 590                 }
 591                 drm_free(entry->buflist,
 592                          entry->buf_count *
 593                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 594
 595                 entry->buf_count = 0;
 596         }
 597 }
 598
 599 #if __OS_HAS_AGP
 600 /**
 601  * Add AGP buffers for DMA transfers.
 602  *
 603  * \param dev struct drm_device to which the buffers are to be added.
 604  * \param request pointer to a struct drm_buf_desc describing the request.
 605  * \return zero on success or a negative number on failure.
 606  *
 607  * After some sanity checks creates a drm_buf structure for each buffer and
 608  * reallocates the buffer list of the same size order to accommodate the new
 609  * buffers.
 610  */
 611 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 612 {
 613         struct drm_device_dma *dma = dev->dma;
 614         struct drm_buf_entry *entry;
 615         struct drm_agp_mem *agp_entry;
 616         struct drm_buf *buf;
 617         unsigned long offset;
 618         unsigned long agp_offset;
 619         int count;
 620         int order;
 621         int size;
 622         int alignment;
 623         int page_order;
 624         int total;
 625         int byte_count;
 626         int i, valid;
 627         struct drm_buf **temp_buflist;
 628
 629         if (!dma)
 630                 return -EINVAL;
 631
 632         count = request->count;
 633         order = drm_order(request->size);
 634         size = 1 << order;
 635
 636         alignment = (request->flags & _DRM_PAGE_ALIGN)
 637             ? PAGE_ALIGN(size) : size;
 638         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 639         total = PAGE_SIZE << page_order;
 640
 641         byte_count = 0;
 642         agp_offset = dev->agp->base + request->agp_start;
 643
 644         DRM_DEBUG("count:      %d\n", count);
 645         DRM_DEBUG("order:      %d\n", order);
 646         DRM_DEBUG("size:       %d\n", size);
 647         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 648         DRM_DEBUG("alignment:  %d\n", alignment);
 649         DRM_DEBUG("page_order: %d\n", page_order);
 650         DRM_DEBUG("total:      %d\n", total);
 651
 652         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 653                 return -EINVAL;
 654         if (dev->queue_count)
 655                 return -EBUSY;  /* Not while in use */
 656
 657         /* Make sure buffers are located in AGP memory that we own */
 658         valid = 0;
 659         list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 660                 if ((agp_offset >= agp_entry->bound) &&
 661                     (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 662                         valid = 1;
 663                         break;
 664                 }
 665         }
 666         if (!list_empty(&dev->agp->memory) && !valid) {
 667                 DRM_DEBUG("zone invalid\n");
 668                 return -EINVAL;
 669         }
 670         spin_lock(&dev->count_lock);
 671         if (dev->buf_use) {
 672                 spin_unlock(&dev->count_lock);
 673                 return -EBUSY;
 674         }
 675         atomic_inc(&dev->buf_alloc);
 676         spin_unlock(&dev->count_lock);
 677
 678         mutex_lock(&dev->struct_mutex);
 679         entry = &dma->bufs[order];
 680         if (entry->buf_count) {
 681                 mutex_unlock(&dev->struct_mutex);
 682                 atomic_dec(&dev->buf_alloc);
 683                 return -ENOMEM; /* May only call once for each order */
 684         }
 685
 686         if (count < 0 || count > 4096) {
 687                 mutex_unlock(&dev->struct_mutex);
 688                 atomic_dec(&dev->buf_alloc);
 689                 return -EINVAL;
 690         }
 691
 692         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 693                                    DRM_MEM_BUFS);
 694         if (!entry->buflist) {
 695                 mutex_unlock(&dev->struct_mutex);
 696                 atomic_dec(&dev->buf_alloc);
 697                 return -ENOMEM;
 698         }
 699         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 700
 701         entry->buf_size = size;
 702         entry->page_order = page_order;
 703
 704         offset = 0;
 705
 706         while (entry->buf_count < count) {
 707                 buf = &entry->buflist[entry->buf_count];
 708                 buf->idx = dma->buf_count + entry->buf_count;
 709                 buf->total = alignment;
 710                 buf->order = order;
 711                 buf->used = 0;
 712
 713                 buf->offset = (dma->byte_count + offset);
 714                 buf->bus_address = agp_offset + offset;
 715                 buf->address = (void *)(agp_offset + offset);
 716                 buf->next = NULL;
 717                 buf->waiting = 0;
 718                 buf->pending = 0;
 719                 init_waitqueue_head(&buf->dma_wait);
 720                 buf->file_priv = NULL;
 721
 722                 buf->dev_priv_size = dev->driver->dev_priv_size;
 723                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 724                 if (!buf->dev_private) {
 725                         /* Set count correctly so we free the proper amount. */
 726                         entry->buf_count = count;
 727                         drm_cleanup_buf_error(dev, entry);
 728                         mutex_unlock(&dev->struct_mutex);
 729                         atomic_dec(&dev->buf_alloc);
 730                         return -ENOMEM;
 731                 }
 732                 memset(buf->dev_private, 0, buf->dev_priv_size);
 733
 734                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 735
 736                 offset += alignment;
 737                 entry->buf_count++;
 738                 byte_count += PAGE_SIZE << page_order;
 739         }
 740
 741         DRM_DEBUG("byte_count: %d\n", byte_count);
 742
 743         temp_buflist = drm_realloc(dma->buflist,
 744                                    dma->buf_count * sizeof(*dma->buflist),
 745                                    (dma->buf_count + entry->buf_count)
 746                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 747         if (!temp_buflist) {
 748                 /* Free the entry because it isn't valid */
 749                 drm_cleanup_buf_error(dev, entry);
 750                 mutex_unlock(&dev->struct_mutex);
 751                 atomic_dec(&dev->buf_alloc);
 752                 return -ENOMEM;
 753         }
 754         dma->buflist = temp_buflist;
 755
 756         for (i = 0; i < entry->buf_count; i++) {
 757                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 758         }
 759
 760         dma->buf_count += entry->buf_count;
 761         dma->seg_count += entry->seg_count;
 762         dma->page_count += byte_count >> PAGE_SHIFT;
 763         dma->byte_count += byte_count;
 764
 765         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 766         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 767
 768         mutex_unlock(&dev->struct_mutex);
 769
 770         request->count = entry->buf_count;
 771         request->size = size;
 772
 773         dma->flags = _DRM_DMA_USE_AGP;
 774
 775         atomic_dec(&dev->buf_alloc);
 776         return 0;
 777 }
 778 EXPORT_SYMBOL(drm_addbufs_agp);
 779 #endif                          /* __OS_HAS_AGP */
 780
 781 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 782 {
 783         struct drm_device_dma *dma = dev->dma;
 784         int count;
 785         int order;
 786         int size;
 787         int total;
 788         int page_order;
 789         struct drm_buf_entry *entry;
 790         drm_dma_handle_t *dmah;
 791         struct drm_buf *buf;
 792         int alignment;
 793         unsigned long offset;
 794         int i;
 795         int byte_count;
 796         int page_count;
 797         unsigned long *temp_pagelist;
 798         struct drm_buf **temp_buflist;
 799
 800         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 801                 return -EINVAL;
 802
 803         if (!dma)
 804                 return -EINVAL;
 805
 806         if (!capable(CAP_SYS_ADMIN))
 807                 return -EPERM;
 808
 809         count = request->count;
 810         order = drm_order(request->size);
 811         size = 1 << order;
 812
 813         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 814                   request->count, request->size, size, order, dev->queue_count);
 815
 816         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 817                 return -EINVAL;
 818         if (dev->queue_count)
 819                 return -EBUSY;  /* Not while in use */
 820
 821         alignment = (request->flags & _DRM_PAGE_ALIGN)
 822             ? PAGE_ALIGN(size) : size;
 823         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 824         total = PAGE_SIZE << page_order;
 825
 826         spin_lock(&dev->count_lock);
 827         if (dev->buf_use) {
 828                 spin_unlock(&dev->count_lock);
 829                 return -EBUSY;
 830         }
 831         atomic_inc(&dev->buf_alloc);
 832         spin_unlock(&dev->count_lock);
 833
 834         mutex_lock(&dev->struct_mutex);
 835         entry = &dma->bufs[order];
 836         if (entry->buf_count) {
 837                 mutex_unlock(&dev->struct_mutex);
 838                 atomic_dec(&dev->buf_alloc);
 839                 return -ENOMEM; /* May only call once for each order */
 840         }
 841
 842         if (count < 0 || count > 4096) {
 843                 mutex_unlock(&dev->struct_mutex);
 844                 atomic_dec(&dev->buf_alloc);
 845                 return -EINVAL;
 846         }
 847
 848         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 849                                    DRM_MEM_BUFS);
 850         if (!entry->buflist) {
 851                 mutex_unlock(&dev->struct_mutex);
 852                 atomic_dec(&dev->buf_alloc);
 853                 return -ENOMEM;
 854         }
 855         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 856
 857         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 858                                    DRM_MEM_SEGS);
 859         if (!entry->seglist) {
 860                 drm_free(entry->buflist,
 861                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 862                 mutex_unlock(&dev->struct_mutex);
 863                 atomic_dec(&dev->buf_alloc);
 864                 return -ENOMEM;
 865         }
 866         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 867
 868         /* Keep the original pagelist until we know all the allocations
 869          * have succeeded
 870          */
 871         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 872                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 873         if (!temp_pagelist) {
 874                 drm_free(entry->buflist,
 875                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 876                 drm_free(entry->seglist,
 877                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 878                 mutex_unlock(&dev->struct_mutex);
 879                 atomic_dec(&dev->buf_alloc);
 880                 return -ENOMEM;
 881         }
 882         memcpy(temp_pagelist,
 883                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 884         DRM_DEBUG("pagelist: %d entries\n",
 885                   dma->page_count + (count << page_order));
 886
 887         entry->buf_size = size;
 888         entry->page_order = page_order;
 889         byte_count = 0;
 890         page_count = 0;
 891
 892         while (entry->buf_count < count) {
 893
 894                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 895
 896                 if (!dmah) {
 897                         /* Set count correctly so we free the proper amount. */
 898                         entry->buf_count = count;
 899                         entry->seg_count = count;
 900                         drm_cleanup_buf_error(dev, entry);
 901                         drm_free(temp_pagelist,
 902                                  (dma->page_count + (count << page_order))
 903                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 904                         mutex_unlock(&dev->struct_mutex);
 905                         atomic_dec(&dev->buf_alloc);
 906                         return -ENOMEM;
 907                 }
 908                 entry->seglist[entry->seg_count++] = dmah;
 909                 for (i = 0; i < (1 << page_order); i++) {
 910                         DRM_DEBUG("page %d @ 0x%08lx\n",
 911                                   dma->page_count + page_count,
 912                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 913                         temp_pagelist[dma->page_count + page_count++]
 914                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 915                 }
 916                 for (offset = 0;
 917                      offset + size <= total && entry->buf_count < count;
 918                      offset += alignment, ++entry->buf_count) {
 919                         buf = &entry->buflist[entry->buf_count];
 920                         buf->idx = dma->buf_count + entry->buf_count;
 921                         buf->total = alignment;
 922                         buf->order = order;
 923                         buf->used = 0;
 924                         buf->offset = (dma->byte_count + byte_count + offset);
 925                         buf->address = (void *)(dmah->vaddr + offset);
 926                         buf->bus_address = dmah->busaddr + offset;
 927                         buf->next = NULL;
 928                         buf->waiting = 0;
 929                         buf->pending = 0;
 930                         init_waitqueue_head(&buf->dma_wait);
 931                         buf->file_priv = NULL;
 932
 933                         buf->dev_priv_size = dev->driver->dev_priv_size;
 934                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 935                                                      DRM_MEM_BUFS);
 936                         if (!buf->dev_private) {
 937                                 /* Set count correctly so we free the proper amount. */
 938                                 entry->buf_count = count;
 939                                 entry->seg_count = count;
 940                                 drm_cleanup_buf_error(dev, entry);
 941                                 drm_free(temp_pagelist,
 942                                          (dma->page_count +
 943                                           (count << page_order))
 944                                          * sizeof(*dma->pagelist),
 945                                          DRM_MEM_PAGES);
 946                                 mutex_unlock(&dev->struct_mutex);
 947                                 atomic_dec(&dev->buf_alloc);
 948                                 return -ENOMEM;
 949                         }
 950                         memset(buf->dev_private, 0, buf->dev_priv_size);
 951
 952                         DRM_DEBUG("buffer %d @ %p\n",
 953                                   entry->buf_count, buf->address);
 954                 }
 955                 byte_count += PAGE_SIZE << page_order;
 956         }
 957
 958         temp_buflist = drm_realloc(dma->buflist,
 959                                    dma->buf_count * sizeof(*dma->buflist),
 960                                    (dma->buf_count + entry->buf_count)
 961                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 962         if (!temp_buflist) {
 963                 /* Free the entry because it isn't valid */
 964                 drm_cleanup_buf_error(dev, entry);
 965                 drm_free(temp_pagelist,
 966                          (dma->page_count + (count << page_order))
 967                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 968                 mutex_unlock(&dev->struct_mutex);
 969                 atomic_dec(&dev->buf_alloc);
 970                 return -ENOMEM;
 971         }
 972         dma->buflist = temp_buflist;
 973
 974         for (i = 0; i < entry->buf_count; i++) {
 975                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 976         }
 977
 978         /* No allocations failed, so now we can replace the orginal pagelist
 979          * with the new one.
 980          */
 981         if (dma->page_count) {
 982                 drm_free(dma->pagelist,
 983                          dma->page_count * sizeof(*dma->pagelist),
 984                          DRM_MEM_PAGES);
 985         }
 986         dma->pagelist = temp_pagelist;
 987
 988         dma->buf_count += entry->buf_count;
 989         dma->seg_count += entry->seg_count;
 990         dma->page_count += entry->seg_count << page_order;
 991         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 992
 993         mutex_unlock(&dev->struct_mutex);
 994
 995         request->count = entry->buf_count;
 996         request->size = size;
 997
 998         if (request->flags & _DRM_PCI_BUFFER_RO)
 999                 dma->flags = _DRM_DMA_USE_PCI_RO;
1000
1001         atomic_dec(&dev->buf_alloc);
1002         return 0;
1003
1004 }
1005 EXPORT_SYMBOL(drm_addbufs_pci);
1006
1007 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
1008 {
1009         struct drm_device_dma *dma = dev->dma;
1010         struct drm_buf_entry *entry;
1011         struct drm_buf *buf;
1012         unsigned long offset;
1013         unsigned long agp_offset;
1014         int count;
1015         int order;
1016         int size;
1017         int alignment;
1018         int page_order;
1019         int total;
1020         int byte_count;
1021         int i;
1022         struct drm_buf **temp_buflist;
1023
1024         if (!drm_core_check_feature(dev, DRIVER_SG))
1025                 return -EINVAL;
1026
1027         if (!dma)
1028                 return -EINVAL;
1029
1030         if (!capable(CAP_SYS_ADMIN))
1031                 return -EPERM;
1032
1033         count = request->count;
1034         order = drm_order(request->size);
1035         size = 1 << order;
1036
1037         alignment = (request->flags & _DRM_PAGE_ALIGN)
1038             ? PAGE_ALIGN(size) : size;
1039         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1040         total = PAGE_SIZE << page_order;
1041
1042         byte_count = 0;
1043         agp_offset = request->agp_start;
1044
1045         DRM_DEBUG("count:      %d\n", count);
1046         DRM_DEBUG("order:      %d\n", order);
1047         DRM_DEBUG("size:       %d\n", size);
1048         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1049         DRM_DEBUG("alignment:  %d\n", alignment);
1050         DRM_DEBUG("page_order: %d\n", page_order);
1051         DRM_DEBUG("total:      %d\n", total);
1052
1053         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1054                 return -EINVAL;
1055         if (dev->queue_count)
1056                 return -EBUSY;  /* Not while in use */
1057
1058         spin_lock(&dev->count_lock);
1059         if (dev->buf_use) {
1060                 spin_unlock(&dev->count_lock);
1061                 return -EBUSY;
1062         }
1063         atomic_inc(&dev->buf_alloc);
1064         spin_unlock(&dev->count_lock);
1065
1066         mutex_lock(&dev->struct_mutex);
1067         entry = &dma->bufs[order];
1068         if (entry->buf_count) {
1069                 mutex_unlock(&dev->struct_mutex);
1070                 atomic_dec(&dev->buf_alloc);
1071                 return -ENOMEM; /* May only call once for each order */
1072         }
1073
1074         if (count < 0 || count > 4096) {
1075                 mutex_unlock(&dev->struct_mutex);
1076                 atomic_dec(&dev->buf_alloc);
1077                 return -EINVAL;
1078         }
1079
1080         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1081                                    DRM_MEM_BUFS);
1082         if (!entry->buflist) {
1083                 mutex_unlock(&dev->struct_mutex);
1084                 atomic_dec(&dev->buf_alloc);
1085                 return -ENOMEM;
1086         }
1087         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1088
1089         entry->buf_size = size;
1090         entry->page_order = page_order;
1091
1092         offset = 0;
1093
1094         while (entry->buf_count < count) {
1095                 buf = &entry->buflist[entry->buf_count];
1096                 buf->idx = dma->buf_count + entry->buf_count;
1097                 buf->total = alignment;
1098                 buf->order = order;
1099                 buf->used = 0;
1100
1101                 buf->offset = (dma->byte_count + offset);
1102                 buf->bus_address = agp_offset + offset;
1103                 buf->address = (void *)(agp_offset + offset
1104                                         + (unsigned long)dev->sg->virtual);
1105                 buf->next = NULL;
1106                 buf->waiting = 0;
1107                 buf->pending = 0;
1108                 init_waitqueue_head(&buf->dma_wait);
1109                 buf->file_priv = NULL;
1110
1111                 buf->dev_priv_size = dev->driver->dev_priv_size;
1112                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1113                 if (!buf->dev_private) {
1114                         /* Set count correctly so we free the proper amount. */
1115                         entry->buf_count = count;
1116                         drm_cleanup_buf_error(dev, entry);
1117                         mutex_unlock(&dev->struct_mutex);
1118                         atomic_dec(&dev->buf_alloc);
1119                         return -ENOMEM;
1120                 }
1121
1122                 memset(buf->dev_private, 0, buf->dev_priv_size);
1123
1124                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1125
1126                 offset += alignment;
1127                 entry->buf_count++;
1128                 byte_count += PAGE_SIZE << page_order;
1129         }
1130
1131         DRM_DEBUG("byte_count: %d\n", byte_count);
1132
1133         temp_buflist = drm_realloc(dma->buflist,
1134                                    dma->buf_count * sizeof(*dma->buflist),
1135                                    (dma->buf_count + entry->buf_count)
1136                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1137         if (!temp_buflist) {
1138                 /* Free the entry because it isn't valid */
1139                 drm_cleanup_buf_error(dev, entry);
1140                 mutex_unlock(&dev->struct_mutex);
1141                 atomic_dec(&dev->buf_alloc);
1142                 return -ENOMEM;
1143         }
1144         dma->buflist = temp_buflist;
1145
1146         for (i = 0; i < entry->buf_count; i++) {
1147                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1148         }
1149
1150         dma->buf_count += entry->buf_count;
1151         dma->seg_count += entry->seg_count;
1152         dma->page_count += byte_count >> PAGE_SHIFT;
1153         dma->byte_count += byte_count;
1154
1155         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1156         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1157
1158         mutex_unlock(&dev->struct_mutex);
1159
1160         request->count = entry->buf_count;
1161         request->size = size;
1162
1163         dma->flags = _DRM_DMA_USE_SG;
1164
1165         atomic_dec(&dev->buf_alloc);
1166         return 0;
1167 }
1168
1169 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1170 {
1171         struct drm_device_dma *dma = dev->dma;
1172         struct drm_buf_entry *entry;
1173         struct drm_buf *buf;
1174         unsigned long offset;
1175         unsigned long agp_offset;
1176         int count;
1177         int order;
1178         int size;
1179         int alignment;
1180         int page_order;
1181         int total;
1182         int byte_count;
1183         int i;
1184         struct drm_buf **temp_buflist;
1185
1186         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1187                 return -EINVAL;
1188
1189         if (!dma)
1190                 return -EINVAL;
1191
1192         if (!capable(CAP_SYS_ADMIN))
1193                 return -EPERM;
1194
1195         count = request->count;
1196         order = drm_order(request->size);
1197         size = 1 << order;
1198
1199         alignment = (request->flags & _DRM_PAGE_ALIGN)
1200             ? PAGE_ALIGN(size) : size;
1201         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1202         total = PAGE_SIZE << page_order;
1203
1204         byte_count = 0;
1205         agp_offset = request->agp_start;
1206
1207         DRM_DEBUG("count:      %d\n", count);
1208         DRM_DEBUG("order:      %d\n", order);
1209         DRM_DEBUG("size:       %d\n", size);
1210         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1211         DRM_DEBUG("alignment:  %d\n", alignment);
1212         DRM_DEBUG("page_order: %d\n", page_order);
1213         DRM_DEBUG("total:      %d\n", total);
1214
1215         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1216                 return -EINVAL;
1217         if (dev->queue_count)
1218                 return -EBUSY;  /* Not while in use */
1219
1220         spin_lock(&dev->count_lock);
1221         if (dev->buf_use) {
1222                 spin_unlock(&dev->count_lock);
1223                 return -EBUSY;
1224         }
1225         atomic_inc(&dev->buf_alloc);
1226         spin_unlock(&dev->count_lock);
1227
1228         mutex_lock(&dev->struct_mutex);
1229         entry = &dma->bufs[order];
1230         if (entry->buf_count) {
1231                 mutex_unlock(&dev->struct_mutex);
1232                 atomic_dec(&dev->buf_alloc);
1233                 return -ENOMEM; /* May only call once for each order */
1234         }
1235
1236         if (count < 0 || count > 4096) {
1237                 mutex_unlock(&dev->struct_mutex);
1238                 atomic_dec(&dev->buf_alloc);
1239                 return -EINVAL;
1240         }
1241
1242         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1243                                    DRM_MEM_BUFS);
1244         if (!entry->buflist) {
1245                 mutex_unlock(&dev->struct_mutex);
1246                 atomic_dec(&dev->buf_alloc);
1247                 return -ENOMEM;
1248         }
1249         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1250
1251         entry->buf_size = size;
1252         entry->page_order = page_order;
1253
1254         offset = 0;
1255
1256         while (entry->buf_count < count) {
1257                 buf = &entry->buflist[entry->buf_count];
1258                 buf->idx = dma->buf_count + entry->buf_count;
1259                 buf->total = alignment;
1260                 buf->order = order;
1261                 buf->used = 0;
1262
1263                 buf->offset = (dma->byte_count + offset);
1264                 buf->bus_address = agp_offset + offset;
1265                 buf->address = (void *)(agp_offset + offset);
1266                 buf->next = NULL;
1267                 buf->waiting = 0;
1268                 buf->pending = 0;
1269                 init_waitqueue_head(&buf->dma_wait);
1270                 buf->file_priv = NULL;
1271
1272                 buf->dev_priv_size = dev->driver->dev_priv_size;
1273                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1274                 if (!buf->dev_private) {
1275                         /* Set count correctly so we free the proper amount. */
1276                         entry->buf_count = count;
1277                         drm_cleanup_buf_error(dev, entry);
1278                         mutex_unlock(&dev->struct_mutex);
1279                         atomic_dec(&dev->buf_alloc);
1280                         return -ENOMEM;
1281                 }
1282                 memset(buf->dev_private, 0, buf->dev_priv_size);
1283
1284                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1285
1286                 offset += alignment;
1287                 entry->buf_count++;
1288                 byte_count += PAGE_SIZE << page_order;
1289         }
1290
1291         DRM_DEBUG("byte_count: %d\n", byte_count);
1292
1293         temp_buflist = drm_realloc(dma->buflist,
1294                                    dma->buf_count * sizeof(*dma->buflist),
1295                                    (dma->buf_count + entry->buf_count)
1296                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1297         if (!temp_buflist) {
1298                 /* Free the entry because it isn't valid */
1299                 drm_cleanup_buf_error(dev, entry);
1300                 mutex_unlock(&dev->struct_mutex);
1301                 atomic_dec(&dev->buf_alloc);
1302                 return -ENOMEM;
1303         }
1304         dma->buflist = temp_buflist;
1305
1306         for (i = 0; i < entry->buf_count; i++) {
1307                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1308         }
1309
1310         dma->buf_count += entry->buf_count;
1311         dma->seg_count += entry->seg_count;
1312         dma->page_count += byte_count >> PAGE_SHIFT;
1313         dma->byte_count += byte_count;
1314
1315         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1316         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1317
1318         mutex_unlock(&dev->struct_mutex);
1319
1320         request->count = entry->buf_count;
1321         request->size = size;
1322
1323         dma->flags = _DRM_DMA_USE_FB;
1324
1325         atomic_dec(&dev->buf_alloc);
1326         return 0;
1327 }
1328
1329
1330 /**
1331  * Add buffers for DMA transfers (ioctl).
1332  *
1333  * \param inode device inode.
1334  * \param file_priv DRM file private.
1335  * \param cmd command.
1336  * \param arg pointer to a struct drm_buf_desc request.
1337  * \return zero on success or a negative number on failure.
1338  *
1339  * According with the memory type specified in drm_buf_desc::flags and the
1340  * build options, it dispatches the call either to addbufs_agp(),
1341  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1342  * PCI memory respectively.
1343  */
1344 int drm_addbufs(struct drm_device *dev, void *data,
1345                 struct drm_file *file_priv)
1346 {
1347         struct drm_buf_desc *request = data;
1348         int ret;
1349
1350         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1351                 return -EINVAL;
1352
1353 #if __OS_HAS_AGP
1354         if (request->flags & _DRM_AGP_BUFFER)
1355                 ret = drm_addbufs_agp(dev, request);
1356         else
1357 #endif
1358         if (request->flags & _DRM_SG_BUFFER)
1359                 ret = drm_addbufs_sg(dev, request);
1360         else if (request->flags & _DRM_FB_BUFFER)
1361                 ret = drm_addbufs_fb(dev, request);
1362         else
1363                 ret = drm_addbufs_pci(dev, request);
1364
1365         return ret;
1366 }
1367
1368 /**
1369  * Get information about the buffer mappings.
1370  *
1371  * This was originally mean for debugging purposes, or by a sophisticated
1372  * client library to determine how best to use the available buffers (e.g.,
1373  * large buffers can be used for image transfer).
1374  *
1375  * \param inode device inode.
1376  * \param file_priv DRM file private.
1377  * \param cmd command.
1378  * \param arg pointer to a drm_buf_info structure.
1379  * \return zero on success or a negative number on failure.
1380  *
1381  * Increments drm_device::buf_use while holding the drm_device::count_lock
1382  * lock, preventing of allocating more buffers after this call. Information
1383  * about each requested buffer is then copied into user space.
1384  */
1385 int drm_infobufs(struct drm_device *dev, void *data,
1386                  struct drm_file *file_priv)
1387 {
1388         struct drm_device_dma *dma = dev->dma;
1389         struct drm_buf_info *request = data;
1390         int i;
1391         int count;
1392
1393         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1394                 return -EINVAL;
1395
1396         if (!dma)
1397                 return -EINVAL;
1398
1399         spin_lock(&dev->count_lock);
1400         if (atomic_read(&dev->buf_alloc)) {
1401                 spin_unlock(&dev->count_lock);
1402                 return -EBUSY;
1403         }
1404         ++dev->buf_use;         /* Can't allocate more after this call */
1405         spin_unlock(&dev->count_lock);
1406
1407         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1408                 if (dma->bufs[i].buf_count)
1409                         ++count;
1410         }
1411
1412         DRM_DEBUG("count = %d\n", count);
1413
1414         if (request->count >= count) {
1415                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1416                         if (dma->bufs[i].buf_count) {
1417                                 struct drm_buf_desc __user *to =
1418                                     &request->list[count];
1419                                 struct drm_buf_entry *from = &dma->bufs[i];
1420                                 struct drm_freelist *list = &dma->bufs[i].freelist;
1421                                 if (copy_to_user(&to->count,
1422                                                  &from->buf_count,
1423                                                  sizeof(from->buf_count)) ||
1424                                     copy_to_user(&to->size,
1425                                                  &from->buf_size,
1426                                                  sizeof(from->buf_size)) ||
1427                                     copy_to_user(&to->low_mark,
1428                                                  &list->low_mark,
1429                                                  sizeof(list->low_mark)) ||
1430                                     copy_to_user(&to->high_mark,
1431                                                  &list->high_mark,
1432                                                  sizeof(list->high_mark)))
1433                                         return -EFAULT;
1434
1435                                 DRM_DEBUG("%d %d %d %d %d\n",
1436                                           i,
1437                                           dma->bufs[i].buf_count,
1438                                           dma->bufs[i].buf_size,
1439                                           dma->bufs[i].freelist.low_mark,
1440                                           dma->bufs[i].freelist.high_mark);
1441                                 ++count;
1442                         }
1443                 }
1444         }
1445         request->count = count;
1446
1447         return 0;
1448 }
1449
1450 /**
1451  * Specifies a low and high water mark for buffer allocation
1452  *
1453  * \param inode device inode.
1454  * \param file_priv DRM file private.
1455  * \param cmd command.
1456  * \param arg a pointer to a drm_buf_desc structure.
1457  * \return zero on success or a negative number on failure.
1458  *
1459  * Verifies that the size order is bounded between the admissible orders and
1460  * updates the respective drm_device_dma::bufs entry low and high water mark.
1461  *
1462  * \note This ioctl is deprecated and mostly never used.
1463  */
1464 int drm_markbufs(struct drm_device *dev, void *data,
1465                  struct drm_file *file_priv)
1466 {
1467         struct drm_device_dma *dma = dev->dma;
1468         struct drm_buf_desc *request = data;
1469         int order;
1470         struct drm_buf_entry *entry;
1471
1472         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1473                 return -EINVAL;
1474
1475         if (!dma)
1476                 return -EINVAL;
1477
1478         DRM_DEBUG("%d, %d, %d\n",
1479                   request->size, request->low_mark, request->high_mark);
1480         order = drm_order(request->size);
1481         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1482                 return -EINVAL;
1483         entry = &dma->bufs[order];
1484
1485         if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1486                 return -EINVAL;
1487         if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1488                 return -EINVAL;
1489
1490         entry->freelist.low_mark = request->low_mark;
1491         entry->freelist.high_mark = request->high_mark;
1492
1493         return 0;
1494 }
1495
1496 /**
1497  * Unreserve the buffers in list, previously reserved using drmDMA.
1498  *
1499  * \param inode device inode.
1500  * \param file_priv DRM file private.
1501  * \param cmd command.
1502  * \param arg pointer to a drm_buf_free structure.
1503  * \return zero on success or a negative number on failure.
1504  *
1505  * Calls free_buffer() for each used buffer.
1506  * This function is primarily used for debugging.
1507  */
1508 int drm_freebufs(struct drm_device *dev, void *data,
1509                  struct drm_file *file_priv)
1510 {
1511         struct drm_device_dma *dma = dev->dma;
1512         struct drm_buf_free *request = data;
1513         int i;
1514         int idx;
1515         struct drm_buf *buf;
1516
1517         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1518                 return -EINVAL;
1519
1520         if (!dma)
1521                 return -EINVAL;
1522
1523         DRM_DEBUG("%d\n", request->count);
1524         for (i = 0; i < request->count; i++) {
1525                 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1526                         return -EFAULT;
1527                 if (idx < 0 || idx >= dma->buf_count) {
1528                         DRM_ERROR("Index %d (of %d max)\n",
1529                                   idx, dma->buf_count - 1);
1530                         return -EINVAL;
1531                 }
1532                 buf = dma->buflist[idx];
1533                 if (buf->file_priv != file_priv) {
1534                         DRM_ERROR("Process %d freeing buffer not owned\n",
1535                                   task_pid_nr(current));
1536                         return -EINVAL;
1537                 }
1538                 drm_free_buffer(dev, buf);
1539         }
1540
1541         return 0;
1542 }
1543
1544 /**
1545  * Maps all of the DMA buffers into client-virtual space (ioctl).
1546  *
1547  * \param inode device inode.
1548  * \param file_priv DRM file private.
1549  * \param cmd command.
1550  * \param arg pointer to a drm_buf_map structure.
1551  * \return zero on success or a negative number on failure.
1552  *
1553  * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1554  * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1555  * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1556  * drm_mmap_dma().
1557  */
1558 int drm_mapbufs(struct drm_device *dev, void *data,
1559                 struct drm_file *file_priv)
1560 {
1561         struct drm_device_dma *dma = dev->dma;
1562         int retcode = 0;
1563         const int zero = 0;
1564         unsigned long virtual;
1565         unsigned long address;
1566         struct drm_buf_map *request = data;
1567         int i;
1568
1569         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1570                 return -EINVAL;
1571
1572         if (!dma)
1573                 return -EINVAL;
1574
1575         spin_lock(&dev->count_lock);
1576         if (atomic_read(&dev->buf_alloc)) {
1577                 spin_unlock(&dev->count_lock);
1578                 return -EBUSY;
1579         }
1580         dev->buf_use++;         /* Can't allocate more after this call */
1581         spin_unlock(&dev->count_lock);
1582
1583         if (request->count >= dma->buf_count) {
1584                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1585                     || (drm_core_check_feature(dev, DRIVER_SG)
1586                         && (dma->flags & _DRM_DMA_USE_SG))
1587                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1588                         && (dma->flags & _DRM_DMA_USE_FB))) {
1589                         struct drm_local_map *map = dev->agp_buffer_map;
1590                         unsigned long token = dev->agp_buffer_token;
1591
1592                         if (!map) {
1593                                 retcode = -EINVAL;
1594                                 goto done;
1595                         }
1596                         down_write(&current->mm->mmap_sem);
1597                         virtual = do_mmap(file_priv->filp, 0, map->size,
1598                                           PROT_READ | PROT_WRITE,
1599                                           MAP_SHARED,
1600                                           token);
1601                         up_write(&current->mm->mmap_sem);
1602                 } else {
1603                         down_write(&current->mm->mmap_sem);
1604                         virtual = do_mmap(file_priv->filp, 0, dma->byte_count,
1605                                           PROT_READ | PROT_WRITE,
1606                                           MAP_SHARED, 0);
1607                         up_write(&current->mm->mmap_sem);
1608                 }
1609                 if (virtual > -1024UL) {
1610                         /* Real error */
1611                         retcode = (signed long)virtual;
1612                         goto done;
1613                 }
1614                 request->virtual = (void __user *)virtual;
1615
1616                 for (i = 0; i < dma->buf_count; i++) {
1617                         if (copy_to_user(&request->list[i].idx,
1618                                          &dma->buflist[i]->idx,
1619                                          sizeof(request->list[0].idx))) {
1620                                 retcode = -EFAULT;
1621                                 goto done;
1622                         }
1623                         if (copy_to_user(&request->list[i].total,
1624                                          &dma->buflist[i]->total,
1625                                          sizeof(request->list[0].total))) {
1626                                 retcode = -EFAULT;
1627                                 goto done;
1628                         }
1629                         if (copy_to_user(&request->list[i].used,
1630                                          &zero, sizeof(zero))) {
1631                                 retcode = -EFAULT;
1632                                 goto done;
1633                         }
1634                         address = virtual + dma->buflist[i]->offset;    /* *** */
1635                         if (copy_to_user(&request->list[i].address,
1636                                          &address, sizeof(address))) {
1637                                 retcode = -EFAULT;
1638                                 goto done;
1639                         }
1640                 }
1641         }
1642       done:
1643         request->count = dma->buf_count;
1644         DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1645
1646         return retcode;
1647 }
1648
1649 /**
1650  * Compute size order.  Returns the exponent of the smaller power of two which
1651  * is greater or equal to given number.
1652  *
1653  * \param size size.
1654  * \return order.
1655  *
1656  * \todo Can be made faster.
1657  */
1658 int drm_order(unsigned long size)
1659 {
1660         int order;
1661         unsigned long tmp;
1662
1663         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1664
1665         if (size & (size - 1))
1666                 ++order;
1667
1668         return order;
1669 }
1670 EXPORT_SYMBOL(drm_order);