linux/drivers/gpu/drm/drm_bufs.c
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   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 <drm/drmP.h>
  42
  43static 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
  80static 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 */
 136static 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 (map->type == _DRM_FRAME_BUFFER ||
 211                    (map->flags & _DRM_WRITE_COMBINING)) {
 212                        map->mtrr =
 213                                arch_phys_wc_add(map->offset, map->size);
 214                }
 215                if (map->type == _DRM_REGISTERS) {
 216                        if (map->flags & _DRM_WRITE_COMBINING)
 217                                map->handle = ioremap_wc(map->offset,
 218                                                         map->size);
 219                        else
 220                                map->handle = ioremap(map->offset, map->size);
 221                        if (!map->handle) {
 222                                kfree(map);
 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                        kfree(map);
 239                        *maplist = list;
 240                        return 0;
 241                }
 242                map->handle = vmalloc_user(map->size);
 243                DRM_DEBUG("%lu %d %p\n",
 244                          map->size, order_base_2(map->size), map->handle);
 245                if (!map->handle) {
 246                        kfree(map);
 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                                kfree(map);
 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 (!dev->agp) {
 265                        kfree(map);
 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                        kfree(map);
 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        }
 306        case _DRM_SCATTER_GATHER:
 307                if (!dev->sg) {
 308                        kfree(map);
 309                        return -EINVAL;
 310                }
 311                map->offset += (unsigned long)dev->sg->virtual;
 312                break;
 313        case _DRM_CONSISTENT:
 314                /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 315                 * As we're limiting the address to 2^32-1 (or less),
 316                 * casting it down to 32 bits is no problem, but we
 317                 * need to point to a 64bit variable first. */
 318                dmah = drm_pci_alloc(dev, map->size, map->size);
 319                if (!dmah) {
 320                        kfree(map);
 321                        return -ENOMEM;
 322                }
 323                map->handle = dmah->vaddr;
 324                map->offset = (unsigned long)dmah->busaddr;
 325                kfree(dmah);
 326                break;
 327        default:
 328                kfree(map);
 329                return -EINVAL;
 330        }
 331
 332        list = kzalloc(sizeof(*list), GFP_KERNEL);
 333        if (!list) {
 334                if (map->type == _DRM_REGISTERS)
 335                        iounmap(map->handle);
 336                kfree(map);
 337                return -EINVAL;
 338        }
 339        list->map = map;
 340
 341        mutex_lock(&dev->struct_mutex);
 342        list_add(&list->head, &dev->maplist);
 343
 344        /* Assign a 32-bit handle */
 345        /* We do it here so that dev->struct_mutex protects the increment */
 346        user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 347                map->offset;
 348        ret = drm_map_handle(dev, &list->hash, user_token, 0,
 349                             (map->type == _DRM_SHM));
 350        if (ret) {
 351                if (map->type == _DRM_REGISTERS)
 352                        iounmap(map->handle);
 353                kfree(map);
 354                kfree(list);
 355                mutex_unlock(&dev->struct_mutex);
 356                return ret;
 357        }
 358
 359        list->user_token = list->hash.key << PAGE_SHIFT;
 360        mutex_unlock(&dev->struct_mutex);
 361
 362        if (!(map->flags & _DRM_DRIVER))
 363                list->master = dev->primary->master;
 364        *maplist = list;
 365        return 0;
 366}
 367
 368int drm_addmap(struct drm_device * dev, resource_size_t offset,
 369               unsigned int size, enum drm_map_type type,
 370               enum drm_map_flags flags, struct drm_local_map ** map_ptr)
 371{
 372        struct drm_map_list *list;
 373        int rc;
 374
 375        rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 376        if (!rc)
 377                *map_ptr = list->map;
 378        return rc;
 379}
 380
 381EXPORT_SYMBOL(drm_addmap);
 382
 383/**
 384 * Ioctl to specify a range of memory that is available for mapping by a
 385 * non-root process.
 386 *
 387 * \param inode device inode.
 388 * \param file_priv DRM file private.
 389 * \param cmd command.
 390 * \param arg pointer to a drm_map structure.
 391 * \return zero on success or a negative value on error.
 392 *
 393 */
 394int drm_addmap_ioctl(struct drm_device *dev, void *data,
 395                     struct drm_file *file_priv)
 396{
 397        struct drm_map *map = data;
 398        struct drm_map_list *maplist;
 399        int err;
 400
 401        if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
 402                return -EPERM;
 403
 404        err = drm_addmap_core(dev, map->offset, map->size, map->type,
 405                              map->flags, &maplist);
 406
 407        if (err)
 408                return err;
 409
 410        /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 411        map->handle = (void *)(unsigned long)maplist->user_token;
 412
 413        /*
 414         * It appears that there are no users of this value whatsoever --
 415         * drmAddMap just discards it.  Let's not encourage its use.
 416         * (Keeping drm_addmap_core's returned mtrr value would be wrong --
 417         *  it's not a real mtrr index anymore.)
 418         */
 419        map->mtrr = -1;
 420
 421        return 0;
 422}
 423
 424/**
 425 * Remove a map private from list and deallocate resources if the mapping
 426 * isn't in use.
 427 *
 428 * Searches the map on drm_device::maplist, removes it from the list, see if
 429 * its being used, and free any associate resource (such as MTRR's) if it's not
 430 * being on use.
 431 *
 432 * \sa drm_addmap
 433 */
 434int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
 435{
 436        struct drm_map_list *r_list = NULL, *list_t;
 437        drm_dma_handle_t dmah;
 438        int found = 0;
 439        struct drm_master *master;
 440
 441        /* Find the list entry for the map and remove it */
 442        list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 443                if (r_list->map == map) {
 444                        master = r_list->master;
 445                        list_del(&r_list->head);
 446                        drm_ht_remove_key(&dev->map_hash,
 447                                          r_list->user_token >> PAGE_SHIFT);
 448                        kfree(r_list);
 449                        found = 1;
 450                        break;
 451                }
 452        }
 453
 454        if (!found)
 455                return -EINVAL;
 456
 457        switch (map->type) {
 458        case _DRM_REGISTERS:
 459                iounmap(map->handle);
 460                /* FALLTHROUGH */
 461        case _DRM_FRAME_BUFFER:
 462                arch_phys_wc_del(map->mtrr);
 463                break;
 464        case _DRM_SHM:
 465                vfree(map->handle);
 466                if (master) {
 467                        if (dev->sigdata.lock == master->lock.hw_lock)
 468                                dev->sigdata.lock = NULL;
 469                        master->lock.hw_lock = NULL;   /* SHM removed */
 470                        master->lock.file_priv = NULL;
 471                        wake_up_interruptible_all(&master->lock.lock_queue);
 472                }
 473                break;
 474        case _DRM_AGP:
 475        case _DRM_SCATTER_GATHER:
 476                break;
 477        case _DRM_CONSISTENT:
 478                dmah.vaddr = map->handle;
 479                dmah.busaddr = map->offset;
 480                dmah.size = map->size;
 481                __drm_pci_free(dev, &dmah);
 482                break;
 483        }
 484        kfree(map);
 485
 486        return 0;
 487}
 488EXPORT_SYMBOL(drm_rmmap_locked);
 489
 490int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
 491{
 492        int ret;
 493
 494        mutex_lock(&dev->struct_mutex);
 495        ret = drm_rmmap_locked(dev, map);
 496        mutex_unlock(&dev->struct_mutex);
 497
 498        return ret;
 499}
 500EXPORT_SYMBOL(drm_rmmap);
 501
 502/* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 503 * the last close of the device, and this is necessary for cleanup when things
 504 * exit uncleanly.  Therefore, having userland manually remove mappings seems
 505 * like a pointless exercise since they're going away anyway.
 506 *
 507 * One use case might be after addmap is allowed for normal users for SHM and
 508 * gets used by drivers that the server doesn't need to care about.  This seems
 509 * unlikely.
 510 *
 511 * \param inode device inode.
 512 * \param file_priv DRM file private.
 513 * \param cmd command.
 514 * \param arg pointer to a struct drm_map structure.
 515 * \return zero on success or a negative value on error.
 516 */
 517int drm_rmmap_ioctl(struct drm_device *dev, void *data,
 518                    struct drm_file *file_priv)
 519{
 520        struct drm_map *request = data;
 521        struct drm_local_map *map = NULL;
 522        struct drm_map_list *r_list;
 523        int ret;
 524
 525        mutex_lock(&dev->struct_mutex);
 526        list_for_each_entry(r_list, &dev->maplist, head) {
 527                if (r_list->map &&
 528                    r_list->user_token == (unsigned long)request->handle &&
 529                    r_list->map->flags & _DRM_REMOVABLE) {
 530                        map = r_list->map;
 531                        break;
 532                }
 533        }
 534
 535        /* List has wrapped around to the head pointer, or its empty we didn't
 536         * find anything.
 537         */
 538        if (list_empty(&dev->maplist) || !map) {
 539                mutex_unlock(&dev->struct_mutex);
 540                return -EINVAL;
 541        }
 542
 543        /* Register and framebuffer maps are permanent */
 544        if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 545                mutex_unlock(&dev->struct_mutex);
 546                return 0;
 547        }
 548
 549        ret = drm_rmmap_locked(dev, map);
 550
 551        mutex_unlock(&dev->struct_mutex);
 552
 553        return ret;
 554}
 555
 556/**
 557 * Cleanup after an error on one of the addbufs() functions.
 558 *
 559 * \param dev DRM device.
 560 * \param entry buffer entry where the error occurred.
 561 *
 562 * Frees any pages and buffers associated with the given entry.
 563 */
 564static void drm_cleanup_buf_error(struct drm_device * dev,
 565                                  struct drm_buf_entry * entry)
 566{
 567        int i;
 568
 569        if (entry->seg_count) {
 570                for (i = 0; i < entry->seg_count; i++) {
 571                        if (entry->seglist[i]) {
 572                                drm_pci_free(dev, entry->seglist[i]);
 573                        }
 574                }
 575                kfree(entry->seglist);
 576
 577                entry->seg_count = 0;
 578        }
 579
 580        if (entry->buf_count) {
 581                for (i = 0; i < entry->buf_count; i++) {
 582                        kfree(entry->buflist[i].dev_private);
 583                }
 584                kfree(entry->buflist);
 585
 586                entry->buf_count = 0;
 587        }
 588}
 589
 590#if __OS_HAS_AGP
 591/**
 592 * Add AGP buffers for DMA transfers.
 593 *
 594 * \param dev struct drm_device to which the buffers are to be added.
 595 * \param request pointer to a struct drm_buf_desc describing the request.
 596 * \return zero on success or a negative number on failure.
 597 *
 598 * After some sanity checks creates a drm_buf structure for each buffer and
 599 * reallocates the buffer list of the same size order to accommodate the new
 600 * buffers.
 601 */
 602int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
 603{
 604        struct drm_device_dma *dma = dev->dma;
 605        struct drm_buf_entry *entry;
 606        struct drm_agp_mem *agp_entry;
 607        struct drm_buf *buf;
 608        unsigned long offset;
 609        unsigned long agp_offset;
 610        int count;
 611        int order;
 612        int size;
 613        int alignment;
 614        int page_order;
 615        int total;
 616        int byte_count;
 617        int i, valid;
 618        struct drm_buf **temp_buflist;
 619
 620        if (!dma)
 621                return -EINVAL;
 622
 623        count = request->count;
 624        order = order_base_2(request->size);
 625        size = 1 << order;
 626
 627        alignment = (request->flags & _DRM_PAGE_ALIGN)
 628            ? PAGE_ALIGN(size) : size;
 629        page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 630        total = PAGE_SIZE << page_order;
 631
 632        byte_count = 0;
 633        agp_offset = dev->agp->base + request->agp_start;
 634
 635        DRM_DEBUG("count:      %d\n", count);
 636        DRM_DEBUG("order:      %d\n", order);
 637        DRM_DEBUG("size:       %d\n", size);
 638        DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 639        DRM_DEBUG("alignment:  %d\n", alignment);
 640        DRM_DEBUG("page_order: %d\n", page_order);
 641        DRM_DEBUG("total:      %d\n", total);
 642
 643        if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 644                return -EINVAL;
 645
 646        /* Make sure buffers are located in AGP memory that we own */
 647        valid = 0;
 648        list_for_each_entry(agp_entry, &dev->agp->memory, head) {
 649                if ((agp_offset >= agp_entry->bound) &&
 650                    (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
 651                        valid = 1;
 652                        break;
 653                }
 654        }
 655        if (!list_empty(&dev->agp->memory) && !valid) {
 656                DRM_DEBUG("zone invalid\n");
 657                return -EINVAL;
 658        }
 659        spin_lock(&dev->buf_lock);
 660        if (dev->buf_use) {
 661                spin_unlock(&dev->buf_lock);
 662                return -EBUSY;
 663        }
 664        atomic_inc(&dev->buf_alloc);
 665        spin_unlock(&dev->buf_lock);
 666
 667        mutex_lock(&dev->struct_mutex);
 668        entry = &dma->bufs[order];
 669        if (entry->buf_count) {
 670                mutex_unlock(&dev->struct_mutex);
 671                atomic_dec(&dev->buf_alloc);
 672                return -ENOMEM; /* May only call once for each order */
 673        }
 674
 675        if (count < 0 || count > 4096) {
 676                mutex_unlock(&dev->struct_mutex);
 677                atomic_dec(&dev->buf_alloc);
 678                return -EINVAL;
 679        }
 680
 681        entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 682        if (!entry->buflist) {
 683                mutex_unlock(&dev->struct_mutex);
 684                atomic_dec(&dev->buf_alloc);
 685                return -ENOMEM;
 686        }
 687
 688        entry->buf_size = size;
 689        entry->page_order = page_order;
 690
 691        offset = 0;
 692
 693        while (entry->buf_count < count) {
 694                buf = &entry->buflist[entry->buf_count];
 695                buf->idx = dma->buf_count + entry->buf_count;
 696                buf->total = alignment;
 697                buf->order = order;
 698                buf->used = 0;
 699
 700                buf->offset = (dma->byte_count + offset);
 701                buf->bus_address = agp_offset + offset;
 702                buf->address = (void *)(agp_offset + offset);
 703                buf->next = NULL;
 704                buf->waiting = 0;
 705                buf->pending = 0;
 706                buf->file_priv = NULL;
 707
 708                buf->dev_priv_size = dev->driver->dev_priv_size;
 709                buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
 710                if (!buf->dev_private) {
 711                        /* Set count correctly so we free the proper amount. */
 712                        entry->buf_count = count;
 713                        drm_cleanup_buf_error(dev, entry);
 714                        mutex_unlock(&dev->struct_mutex);
 715                        atomic_dec(&dev->buf_alloc);
 716                        return -ENOMEM;
 717                }
 718
 719                DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 720
 721                offset += alignment;
 722                entry->buf_count++;
 723                byte_count += PAGE_SIZE << page_order;
 724        }
 725
 726        DRM_DEBUG("byte_count: %d\n", byte_count);
 727
 728        temp_buflist = krealloc(dma->buflist,
 729                                (dma->buf_count + entry->buf_count) *
 730                                sizeof(*dma->buflist), GFP_KERNEL);
 731        if (!temp_buflist) {
 732                /* Free the entry because it isn't valid */
 733                drm_cleanup_buf_error(dev, entry);
 734                mutex_unlock(&dev->struct_mutex);
 735                atomic_dec(&dev->buf_alloc);
 736                return -ENOMEM;
 737        }
 738        dma->buflist = temp_buflist;
 739
 740        for (i = 0; i < entry->buf_count; i++) {
 741                dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 742        }
 743
 744        dma->buf_count += entry->buf_count;
 745        dma->seg_count += entry->seg_count;
 746        dma->page_count += byte_count >> PAGE_SHIFT;
 747        dma->byte_count += byte_count;
 748
 749        DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 750        DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 751
 752        mutex_unlock(&dev->struct_mutex);
 753
 754        request->count = entry->buf_count;
 755        request->size = size;
 756
 757        dma->flags = _DRM_DMA_USE_AGP;
 758
 759        atomic_dec(&dev->buf_alloc);
 760        return 0;
 761}
 762EXPORT_SYMBOL(drm_addbufs_agp);
 763#endif                          /* __OS_HAS_AGP */
 764
 765int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
 766{
 767        struct drm_device_dma *dma = dev->dma;
 768        int count;
 769        int order;
 770        int size;
 771        int total;
 772        int page_order;
 773        struct drm_buf_entry *entry;
 774        drm_dma_handle_t *dmah;
 775        struct drm_buf *buf;
 776        int alignment;
 777        unsigned long offset;
 778        int i;
 779        int byte_count;
 780        int page_count;
 781        unsigned long *temp_pagelist;
 782        struct drm_buf **temp_buflist;
 783
 784        if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 785                return -EINVAL;
 786
 787        if (!dma)
 788                return -EINVAL;
 789
 790        if (!capable(CAP_SYS_ADMIN))
 791                return -EPERM;
 792
 793        count = request->count;
 794        order = order_base_2(request->size);
 795        size = 1 << order;
 796
 797        DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
 798                  request->count, request->size, size, order);
 799
 800        if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 801                return -EINVAL;
 802
 803        alignment = (request->flags & _DRM_PAGE_ALIGN)
 804            ? PAGE_ALIGN(size) : size;
 805        page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 806        total = PAGE_SIZE << page_order;
 807
 808        spin_lock(&dev->buf_lock);
 809        if (dev->buf_use) {
 810                spin_unlock(&dev->buf_lock);
 811                return -EBUSY;
 812        }
 813        atomic_inc(&dev->buf_alloc);
 814        spin_unlock(&dev->buf_lock);
 815
 816        mutex_lock(&dev->struct_mutex);
 817        entry = &dma->bufs[order];
 818        if (entry->buf_count) {
 819                mutex_unlock(&dev->struct_mutex);
 820                atomic_dec(&dev->buf_alloc);
 821                return -ENOMEM; /* May only call once for each order */
 822        }
 823
 824        if (count < 0 || count > 4096) {
 825                mutex_unlock(&dev->struct_mutex);
 826                atomic_dec(&dev->buf_alloc);
 827                return -EINVAL;
 828        }
 829
 830        entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
 831        if (!entry->buflist) {
 832                mutex_unlock(&dev->struct_mutex);
 833                atomic_dec(&dev->buf_alloc);
 834                return -ENOMEM;
 835        }
 836
 837        entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
 838        if (!entry->seglist) {
 839                kfree(entry->buflist);
 840                mutex_unlock(&dev->struct_mutex);
 841                atomic_dec(&dev->buf_alloc);
 842                return -ENOMEM;
 843        }
 844
 845        /* Keep the original pagelist until we know all the allocations
 846         * have succeeded
 847         */
 848        temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
 849                               sizeof(*dma->pagelist), GFP_KERNEL);
 850        if (!temp_pagelist) {
 851                kfree(entry->buflist);
 852                kfree(entry->seglist);
 853                mutex_unlock(&dev->struct_mutex);
 854                atomic_dec(&dev->buf_alloc);
 855                return -ENOMEM;
 856        }
 857        memcpy(temp_pagelist,
 858               dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 859        DRM_DEBUG("pagelist: %d entries\n",
 860                  dma->page_count + (count << page_order));
 861
 862        entry->buf_size = size;
 863        entry->page_order = page_order;
 864        byte_count = 0;
 865        page_count = 0;
 866
 867        while (entry->buf_count < count) {
 868
 869                dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
 870
 871                if (!dmah) {
 872                        /* Set count correctly so we free the proper amount. */
 873                        entry->buf_count = count;
 874                        entry->seg_count = count;
 875                        drm_cleanup_buf_error(dev, entry);
 876                        kfree(temp_pagelist);
 877                        mutex_unlock(&dev->struct_mutex);
 878                        atomic_dec(&dev->buf_alloc);
 879                        return -ENOMEM;
 880                }
 881                entry->seglist[entry->seg_count++] = dmah;
 882                for (i = 0; i < (1 << page_order); i++) {
 883                        DRM_DEBUG("page %d @ 0x%08lx\n",
 884                                  dma->page_count + page_count,
 885                                  (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 886                        temp_pagelist[dma->page_count + page_count++]
 887                                = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 888                }
 889                for (offset = 0;
 890                     offset + size <= total && entry->buf_count < count;
 891                     offset += alignment, ++entry->buf_count) {
 892                        buf = &entry->buflist[entry->buf_count];
 893                        buf->idx = dma->buf_count + entry->buf_count;
 894                        buf->total = alignment;
 895                        buf->order = order;
 896                        buf->used = 0;
 897                        buf->offset = (dma->byte_count + byte_count + offset);
 898                        buf->address = (void *)(dmah->vaddr + offset);
 899                        buf->bus_address = dmah->busaddr + offset;
 900                        buf->next = NULL;
 901                        buf->waiting = 0;
 902                        buf->pending = 0;
 903                        buf->file_priv = NULL;
 904
 905                        buf->dev_priv_size = dev->driver->dev_priv_size;
 906                        buf->dev_private = kzalloc(buf->dev_priv_size,
 907                                                GFP_KERNEL);
 908                        if (!buf->dev_private) {
 909                                /* Set count correctly so we free the proper amount. */
 910                                entry->buf_count = count;
 911                                entry->seg_count = count;
 912                                drm_cleanup_buf_error(dev, entry);
 913                                kfree(temp_pagelist);
 914                                mutex_unlock(&dev->struct_mutex);
 915                                atomic_dec(&dev->buf_alloc);
 916                                return -ENOMEM;
 917                        }
 918
 919                        DRM_DEBUG("buffer %d @ %p\n",
 920                                  entry->buf_count, buf->address);
 921                }
 922                byte_count += PAGE_SIZE << page_order;
 923        }
 924
 925        temp_buflist = krealloc(dma->buflist,
 926                                (dma->buf_count + entry->buf_count) *
 927                                sizeof(*dma->buflist), GFP_KERNEL);
 928        if (!temp_buflist) {
 929                /* Free the entry because it isn't valid */
 930                drm_cleanup_buf_error(dev, entry);
 931                kfree(temp_pagelist);
 932                mutex_unlock(&dev->struct_mutex);
 933                atomic_dec(&dev->buf_alloc);
 934                return -ENOMEM;
 935        }
 936        dma->buflist = temp_buflist;
 937
 938        for (i = 0; i < entry->buf_count; i++) {
 939                dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 940        }
 941
 942        /* No allocations failed, so now we can replace the original pagelist
 943         * with the new one.
 944         */
 945        if (dma->page_count) {
 946                kfree(dma->pagelist);
 947        }
 948        dma->pagelist = temp_pagelist;
 949
 950        dma->buf_count += entry->buf_count;
 951        dma->seg_count += entry->seg_count;
 952        dma->page_count += entry->seg_count << page_order;
 953        dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 954
 955        mutex_unlock(&dev->struct_mutex);
 956
 957        request->count = entry->buf_count;
 958        request->size = size;
 959
 960        if (request->flags & _DRM_PCI_BUFFER_RO)
 961                dma->flags = _DRM_DMA_USE_PCI_RO;
 962
 963        atomic_dec(&dev->buf_alloc);
 964        return 0;
 965
 966}
 967EXPORT_SYMBOL(drm_addbufs_pci);
 968
 969static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
 970{
 971        struct drm_device_dma *dma = dev->dma;
 972        struct drm_buf_entry *entry;
 973        struct drm_buf *buf;
 974        unsigned long offset;
 975        unsigned long agp_offset;
 976        int count;
 977        int order;
 978        int size;
 979        int alignment;
 980        int page_order;
 981        int total;
 982        int byte_count;
 983        int i;
 984        struct drm_buf **temp_buflist;
 985
 986        if (!drm_core_check_feature(dev, DRIVER_SG))
 987                return -EINVAL;
 988
 989        if (!dma)
 990                return -EINVAL;
 991
 992        if (!capable(CAP_SYS_ADMIN))
 993                return -EPERM;
 994
 995        count = request->count;
 996        order = order_base_2(request->size);
 997        size = 1 << order;
 998
 999        alignment = (request->flags & _DRM_PAGE_ALIGN)
1000            ? PAGE_ALIGN(size) : size;
1001        page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1002        total = PAGE_SIZE << page_order;
1003
1004        byte_count = 0;
1005        agp_offset = request->agp_start;
1006
1007        DRM_DEBUG("count:      %d\n", count);
1008        DRM_DEBUG("order:      %d\n", order);
1009        DRM_DEBUG("size:       %d\n", size);
1010        DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1011        DRM_DEBUG("alignment:  %d\n", alignment);
1012        DRM_DEBUG("page_order: %d\n", page_order);
1013        DRM_DEBUG("total:      %d\n", total);
1014
1015        if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1016                return -EINVAL;
1017
1018        spin_lock(&dev->buf_lock);
1019        if (dev->buf_use) {
1020                spin_unlock(&dev->buf_lock);
1021                return -EBUSY;
1022        }
1023        atomic_inc(&dev->buf_alloc);
1024        spin_unlock(&dev->buf_lock);
1025
1026        mutex_lock(&dev->struct_mutex);
1027        entry = &dma->bufs[order];
1028        if (entry->buf_count) {
1029                mutex_unlock(&dev->struct_mutex);
1030                atomic_dec(&dev->buf_alloc);
1031                return -ENOMEM; /* May only call once for each order */
1032        }
1033
1034        if (count < 0 || count > 4096) {
1035                mutex_unlock(&dev->struct_mutex);
1036                atomic_dec(&dev->buf_alloc);
1037                return -EINVAL;
1038        }
1039
1040        entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1041                                GFP_KERNEL);
1042        if (!entry->buflist) {
1043                mutex_unlock(&dev->struct_mutex);
1044                atomic_dec(&dev->buf_alloc);
1045                return -ENOMEM;
1046        }
1047
1048        entry->buf_size = size;
1049        entry->page_order = page_order;
1050
1051        offset = 0;
1052
1053        while (entry->buf_count < count) {
1054                buf = &entry->buflist[entry->buf_count];
1055                buf->idx = dma->buf_count + entry->buf_count;
1056                buf->total = alignment;
1057                buf->order = order;
1058                buf->used = 0;
1059
1060                buf->offset = (dma->byte_count + offset);
1061                buf->bus_address = agp_offset + offset;
1062                buf->address = (void *)(agp_offset + offset
1063                                        + (unsigned long)dev->sg->virtual);
1064                buf->next = NULL;
1065                buf->waiting = 0;
1066                buf->pending = 0;
1067                buf->file_priv = NULL;
1068
1069                buf->dev_priv_size = dev->driver->dev_priv_size;
1070                buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1071                if (!buf->dev_private) {
1072                        /* Set count correctly so we free the proper amount. */
1073                        entry->buf_count = count;
1074                        drm_cleanup_buf_error(dev, entry);
1075                        mutex_unlock(&dev->struct_mutex);
1076                        atomic_dec(&dev->buf_alloc);
1077                        return -ENOMEM;
1078                }
1079
1080                DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1081
1082                offset += alignment;
1083                entry->buf_count++;
1084                byte_count += PAGE_SIZE << page_order;
1085        }
1086
1087        DRM_DEBUG("byte_count: %d\n", byte_count);
1088
1089        temp_buflist = krealloc(dma->buflist,
1090                                (dma->buf_count + entry->buf_count) *
1091                                sizeof(*dma->buflist), GFP_KERNEL);
1092        if (!temp_buflist) {
1093                /* Free the entry because it isn't valid */
1094                drm_cleanup_buf_error(dev, entry);
1095                mutex_unlock(&dev->struct_mutex);
1096                atomic_dec(&dev->buf_alloc);
1097                return -ENOMEM;
1098        }
1099        dma->buflist = temp_buflist;
1100
1101        for (i = 0; i < entry->buf_count; i++) {
1102                dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1103        }
1104
1105        dma->buf_count += entry->buf_count;
1106        dma->seg_count += entry->seg_count;
1107        dma->page_count += byte_count >> PAGE_SHIFT;
1108        dma->byte_count += byte_count;
1109
1110        DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1111        DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1112
1113        mutex_unlock(&dev->struct_mutex);
1114
1115        request->count = entry->buf_count;
1116        request->size = size;
1117
1118        dma->flags = _DRM_DMA_USE_SG;
1119
1120        atomic_dec(&dev->buf_alloc);
1121        return 0;
1122}
1123
1124/**
1125 * Add buffers for DMA transfers (ioctl).
1126 *
1127 * \param inode device inode.
1128 * \param file_priv DRM file private.
1129 * \param cmd command.
1130 * \param arg pointer to a struct drm_buf_desc request.
1131 * \return zero on success or a negative number on failure.
1132 *
1133 * According with the memory type specified in drm_buf_desc::flags and the
1134 * build options, it dispatches the call either to addbufs_agp(),
1135 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1136 * PCI memory respectively.
1137 */
1138int drm_addbufs(struct drm_device *dev, void *data,
1139                struct drm_file *file_priv)
1140{
1141        struct drm_buf_desc *request = data;
1142        int ret;
1143
1144        if (drm_core_check_feature(dev, DRIVER_MODESET))
1145                return -EINVAL;
1146
1147        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1148                return -EINVAL;
1149
1150#if __OS_HAS_AGP
1151        if (request->flags & _DRM_AGP_BUFFER)
1152                ret = drm_addbufs_agp(dev, request);
1153        else
1154#endif
1155        if (request->flags & _DRM_SG_BUFFER)
1156                ret = drm_addbufs_sg(dev, request);
1157        else if (request->flags & _DRM_FB_BUFFER)
1158                ret = -EINVAL;
1159        else
1160                ret = drm_addbufs_pci(dev, request);
1161
1162        return ret;
1163}
1164
1165/**
1166 * Get information about the buffer mappings.
1167 *
1168 * This was originally mean for debugging purposes, or by a sophisticated
1169 * client library to determine how best to use the available buffers (e.g.,
1170 * large buffers can be used for image transfer).
1171 *
1172 * \param inode device inode.
1173 * \param file_priv DRM file private.
1174 * \param cmd command.
1175 * \param arg pointer to a drm_buf_info structure.
1176 * \return zero on success or a negative number on failure.
1177 *
1178 * Increments drm_device::buf_use while holding the drm_device::buf_lock
1179 * lock, preventing of allocating more buffers after this call. Information
1180 * about each requested buffer is then copied into user space.
1181 */
1182int drm_infobufs(struct drm_device *dev, void *data,
1183                 struct drm_file *file_priv)
1184{
1185        struct drm_device_dma *dma = dev->dma;
1186        struct drm_buf_info *request = data;
1187        int i;
1188        int count;
1189
1190        if (drm_core_check_feature(dev, DRIVER_MODESET))
1191                return -EINVAL;
1192
1193        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1194                return -EINVAL;
1195
1196        if (!dma)
1197                return -EINVAL;
1198
1199        spin_lock(&dev->buf_lock);
1200        if (atomic_read(&dev->buf_alloc)) {
1201                spin_unlock(&dev->buf_lock);
1202                return -EBUSY;
1203        }
1204        ++dev->buf_use;         /* Can't allocate more after this call */
1205        spin_unlock(&dev->buf_lock);
1206
1207        for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1208                if (dma->bufs[i].buf_count)
1209                        ++count;
1210        }
1211
1212        DRM_DEBUG("count = %d\n", count);
1213
1214        if (request->count >= count) {
1215                for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1216                        if (dma->bufs[i].buf_count) {
1217                                struct drm_buf_desc __user *to =
1218                                    &request->list[count];
1219                                struct drm_buf_entry *from = &dma->bufs[i];
1220                                if (copy_to_user(&to->count,
1221                                                 &from->buf_count,
1222                                                 sizeof(from->buf_count)) ||
1223                                    copy_to_user(&to->size,
1224                                                 &from->buf_size,
1225                                                 sizeof(from->buf_size)) ||
1226                                    copy_to_user(&to->low_mark,
1227                                                 &from->low_mark,
1228                                                 sizeof(from->low_mark)) ||
1229                                    copy_to_user(&to->high_mark,
1230                                                 &from->high_mark,
1231                                                 sizeof(from->high_mark)))
1232                                        return -EFAULT;
1233
1234                                DRM_DEBUG("%d %d %d %d %d\n",
1235                                          i,
1236                                          dma->bufs[i].buf_count,
1237                                          dma->bufs[i].buf_size,
1238                                          dma->bufs[i].low_mark,
1239                                          dma->bufs[i].high_mark);
1240                                ++count;
1241                        }
1242                }
1243        }
1244        request->count = count;
1245
1246        return 0;
1247}
1248
1249/**
1250 * Specifies a low and high water mark for buffer allocation
1251 *
1252 * \param inode device inode.
1253 * \param file_priv DRM file private.
1254 * \param cmd command.
1255 * \param arg a pointer to a drm_buf_desc structure.
1256 * \return zero on success or a negative number on failure.
1257 *
1258 * Verifies that the size order is bounded between the admissible orders and
1259 * updates the respective drm_device_dma::bufs entry low and high water mark.
1260 *
1261 * \note This ioctl is deprecated and mostly never used.
1262 */
1263int drm_markbufs(struct drm_device *dev, void *data,
1264                 struct drm_file *file_priv)
1265{
1266        struct drm_device_dma *dma = dev->dma;
1267        struct drm_buf_desc *request = data;
1268        int order;
1269        struct drm_buf_entry *entry;
1270
1271        if (drm_core_check_feature(dev, DRIVER_MODESET))
1272                return -EINVAL;
1273
1274        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1275                return -EINVAL;
1276
1277        if (!dma)
1278                return -EINVAL;
1279
1280        DRM_DEBUG("%d, %d, %d\n",
1281                  request->size, request->low_mark, request->high_mark);
1282        order = order_base_2(request->size);
1283        if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1284                return -EINVAL;
1285        entry = &dma->bufs[order];
1286
1287        if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1288                return -EINVAL;
1289        if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1290                return -EINVAL;
1291
1292        entry->low_mark = request->low_mark;
1293        entry->high_mark = request->high_mark;
1294
1295        return 0;
1296}
1297
1298/**
1299 * Unreserve the buffers in list, previously reserved using drmDMA.
1300 *
1301 * \param inode device inode.
1302 * \param file_priv DRM file private.
1303 * \param cmd command.
1304 * \param arg pointer to a drm_buf_free structure.
1305 * \return zero on success or a negative number on failure.
1306 *
1307 * Calls free_buffer() for each used buffer.
1308 * This function is primarily used for debugging.
1309 */
1310int drm_freebufs(struct drm_device *dev, void *data,
1311                 struct drm_file *file_priv)
1312{
1313        struct drm_device_dma *dma = dev->dma;
1314        struct drm_buf_free *request = data;
1315        int i;
1316        int idx;
1317        struct drm_buf *buf;
1318
1319        if (drm_core_check_feature(dev, DRIVER_MODESET))
1320                return -EINVAL;
1321
1322        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1323                return -EINVAL;
1324
1325        if (!dma)
1326                return -EINVAL;
1327
1328        DRM_DEBUG("%d\n", request->count);
1329        for (i = 0; i < request->count; i++) {
1330                if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1331                        return -EFAULT;
1332                if (idx < 0 || idx >= dma->buf_count) {
1333                        DRM_ERROR("Index %d (of %d max)\n",
1334                                  idx, dma->buf_count - 1);
1335                        return -EINVAL;
1336                }
1337                buf = dma->buflist[idx];
1338                if (buf->file_priv != file_priv) {
1339                        DRM_ERROR("Process %d freeing buffer not owned\n",
1340                                  task_pid_nr(current));
1341                        return -EINVAL;
1342                }
1343                drm_free_buffer(dev, buf);
1344        }
1345
1346        return 0;
1347}
1348
1349/**
1350 * Maps all of the DMA buffers into client-virtual space (ioctl).
1351 *
1352 * \param inode device inode.
1353 * \param file_priv DRM file private.
1354 * \param cmd command.
1355 * \param arg pointer to a drm_buf_map structure.
1356 * \return zero on success or a negative number on failure.
1357 *
1358 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1359 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1360 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1361 * drm_mmap_dma().
1362 */
1363int drm_mapbufs(struct drm_device *dev, void *data,
1364                struct drm_file *file_priv)
1365{
1366        struct drm_device_dma *dma = dev->dma;
1367        int retcode = 0;
1368        const int zero = 0;
1369        unsigned long virtual;
1370        unsigned long address;
1371        struct drm_buf_map *request = data;
1372        int i;
1373
1374        if (drm_core_check_feature(dev, DRIVER_MODESET))
1375                return -EINVAL;
1376
1377        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1378                return -EINVAL;
1379
1380        if (!dma)
1381                return -EINVAL;
1382
1383        spin_lock(&dev->buf_lock);
1384        if (atomic_read(&dev->buf_alloc)) {
1385                spin_unlock(&dev->buf_lock);
1386                return -EBUSY;
1387        }
1388        dev->buf_use++;         /* Can't allocate more after this call */
1389        spin_unlock(&dev->buf_lock);
1390
1391        if (request->count >= dma->buf_count) {
1392                if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1393                    || (drm_core_check_feature(dev, DRIVER_SG)
1394                        && (dma->flags & _DRM_DMA_USE_SG))) {
1395                        struct drm_local_map *map = dev->agp_buffer_map;
1396                        unsigned long token = dev->agp_buffer_token;
1397
1398                        if (!map) {
1399                                retcode = -EINVAL;
1400                                goto done;
1401                        }
1402                        virtual = vm_mmap(file_priv->filp, 0, map->size,
1403                                          PROT_READ | PROT_WRITE,
1404                                          MAP_SHARED,
1405                                          token);
1406                } else {
1407                        virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1408                                          PROT_READ | PROT_WRITE,
1409                                          MAP_SHARED, 0);
1410                }
1411                if (virtual > -1024UL) {
1412                        /* Real error */
1413                        retcode = (signed long)virtual;
1414                        goto done;
1415                }
1416                request->virtual = (void __user *)virtual;
1417
1418                for (i = 0; i < dma->buf_count; i++) {
1419                        if (copy_to_user(&request->list[i].idx,
1420                                         &dma->buflist[i]->idx,
1421                                         sizeof(request->list[0].idx))) {
1422                                retcode = -EFAULT;
1423                                goto done;
1424                        }
1425                        if (copy_to_user(&request->list[i].total,
1426                                         &dma->buflist[i]->total,
1427                                         sizeof(request->list[0].total))) {
1428                                retcode = -EFAULT;
1429                                goto done;
1430                        }
1431                        if (copy_to_user(&request->list[i].used,
1432                                         &zero, sizeof(zero))) {
1433                                retcode = -EFAULT;
1434                                goto done;
1435                        }
1436                        address = virtual + dma->buflist[i]->offset;    /* *** */
1437                        if (copy_to_user(&request->list[i].address,
1438                                         &address, sizeof(address))) {
1439                                retcode = -EFAULT;
1440                                goto done;
1441                        }
1442                }
1443        }
1444      done:
1445        request->count = dma->buf_count;
1446        DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1447
1448        return retcode;
1449}
1450
1451int drm_dma_ioctl(struct drm_device *dev, void *data,
1452                  struct drm_file *file_priv)
1453{
1454        if (drm_core_check_feature(dev, DRIVER_MODESET))
1455                return -EINVAL;
1456
1457        if (dev->driver->dma_ioctl)
1458                return dev->driver->dma_ioctl(dev, data, file_priv);
1459        else
1460                return -EINVAL;
1461}
1462
1463struct drm_local_map *drm_getsarea(struct drm_device *dev)
1464{
1465        struct drm_map_list *entry;
1466
1467        list_for_each_entry(entry, &dev->maplist, head) {
1468                if (entry->map && entry->map->type == _DRM_SHM &&
1469                    (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1470                        return entry->map;
1471                }
1472        }
1473        return NULL;
1474}
1475EXPORT_SYMBOL(drm_getsarea);
1476