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