linux/drivers/gpu/drm/drm_bufs.c
<<
>>
Prefs
   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
  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 (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
 369int 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
 382EXPORT_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 */
 395int 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 */
 426int 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}
 487EXPORT_SYMBOL(drm_rmmap_locked);
 488
 489int 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}
 499EXPORT_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 */
 516int 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 */
 563static 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 */
 601int 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}
 764EXPORT_SYMBOL(drm_addbufs_agp);
 765#endif                          /* __OS_HAS_AGP */
 766
 767int 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}
 972EXPORT_SYMBOL(drm_addbufs_pci);
 973
 974static 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
1132static 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 */
1304int 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 */
1345int 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 */
1424int 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 */
1468int 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 */
1518int 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 */
1618int 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}
1630EXPORT_SYMBOL(drm_order);
1631
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.