err.no Git - linux-2.6/blob - drivers/char/drm/drm_bufs.c

   1 /**
   2  * \file drm_bufs.c
   3  * Generic buffer template
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
  11  *
  12  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
  13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14  * All Rights Reserved.
  15  *
  16  * Permission is hereby granted, free of charge, to any person obtaining a
  17  * copy of this software and associated documentation files (the "Software"),
  18  * to deal in the Software without restriction, including without limitation
  19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20  * and/or sell copies of the Software, and to permit persons to whom the
  21  * Software is furnished to do so, subject to the following conditions:
  22  *
  23  * The above copyright notice and this permission notice (including the next
  24  * paragraph) shall be included in all copies or substantial portions of the
  25  * Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33  * OTHER DEALINGS IN THE SOFTWARE.
  34  */
  35
  36 #include <linux/vmalloc.h>
  37 #include "drmP.h"
  38
  39 unsigned long drm_get_resource_start(drm_device_t *dev, unsigned int resource)
  40 {
  41         return pci_resource_start(dev->pdev, resource);
  42 }
  43 EXPORT_SYMBOL(drm_get_resource_start);
  44
  45 unsigned long drm_get_resource_len(drm_device_t *dev, unsigned int resource)
  46 {
  47         return pci_resource_len(dev->pdev, resource);
  48 }
  49
  50 EXPORT_SYMBOL(drm_get_resource_len);
  51
  52 static drm_map_list_t *drm_find_matching_map(drm_device_t *dev,
  53                                              drm_local_map_t *map)
  54 {
  55         struct list_head *list;
  56
  57         list_for_each(list, &dev->maplist->head) {
  58                 drm_map_list_t *entry = list_entry(list, drm_map_list_t, head);
  59                 if (entry->map && map->type == entry->map->type &&
  60                     entry->map->offset == map->offset) {
  61                         return entry;
  62                 }
  63         }
  64
  65         return NULL;
  66 }
  67
  68 /*
  69  * Used to allocate 32-bit handles for mappings.
  70  */
  71 #define START_RANGE 0x10000000
  72 #define END_RANGE 0x40000000
  73
  74 #ifdef _LP64
  75 static __inline__ unsigned int HandleID(unsigned long lhandle,
  76                                         drm_device_t *dev)
  77 {
  78         static unsigned int map32_handle = START_RANGE;
  79         unsigned int hash;
  80
  81         if (lhandle & 0xffffffff00000000) {
  82                 hash = map32_handle;
  83                 map32_handle += PAGE_SIZE;
  84                 if (map32_handle > END_RANGE)
  85                         map32_handle = START_RANGE;
  86         } else
  87                 hash = lhandle;
  88
  89         while (1) {
  90                 drm_map_list_t *_entry;
  91                 list_for_each_entry(_entry, &dev->maplist->head, head) {
  92                         if (_entry->user_token == hash)
  93                                 break;
  94                 }
  95                 if (&_entry->head == &dev->maplist->head)
  96                         return hash;
  97
  98                 hash += PAGE_SIZE;
  99                 map32_handle += PAGE_SIZE;
 100         }
 101 }
 102 #else
 103 # define HandleID(x,dev) (unsigned int)(x)
 104 #endif
 105
 106 /**
 107  * Ioctl to specify a range of memory that is available for mapping by a non-root process.
 108  *
 109  * \param inode device inode.
 110  * \param filp file pointer.
 111  * \param cmd command.
 112  * \param arg pointer to a drm_map structure.
 113  * \return zero on success or a negative value on error.
 114  *
 115  * Adjusts the memory offset to its absolute value according to the mapping
 116  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 117  * applicable and if supported by the kernel.
 118  */
 119 static int drm_addmap_core(drm_device_t * dev, unsigned int offset,
 120                            unsigned int size, drm_map_type_t type,
 121                            drm_map_flags_t flags, drm_map_list_t ** maplist)
 122 {
 123         drm_map_t *map;
 124         drm_map_list_t *list;
 125         drm_dma_handle_t *dmah;
 126
 127         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
 128         if (!map)
 129                 return -ENOMEM;
 130
 131         map->offset = offset;
 132         map->size = size;
 133         map->flags = flags;
 134         map->type = type;
 135
 136         /* Only allow shared memory to be removable since we only keep enough
 137          * book keeping information about shared memory to allow for removal
 138          * when processes fork.
 139          */
 140         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 141                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 142                 return -EINVAL;
 143         }
 144         DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
 145                   map->offset, map->size, map->type);
 146         if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 147                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 148                 return -EINVAL;
 149         }
 150         map->mtrr = -1;
 151         map->handle = NULL;
 152
 153         switch (map->type) {
 154         case _DRM_REGISTERS:
 155         case _DRM_FRAME_BUFFER:
 156 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 157                 if (map->offset + (map->size-1) < map->offset ||
 158                     map->offset < virt_to_phys(high_memory)) {
 159                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 160                         return -EINVAL;
 161                 }
 162 #endif
 163 #ifdef __alpha__
 164                 map->offset += dev->hose->mem_space->start;
 165 #endif
 166                 /* Some drivers preinitialize some maps, without the X Server
 167                  * needing to be aware of it.  Therefore, we just return success
 168                  * when the server tries to create a duplicate map.
 169                  */
 170                 list = drm_find_matching_map(dev, map);
 171                 if (list != NULL) {
 172                         if (list->map->size != map->size) {
 173                                 DRM_DEBUG("Matching maps of type %d with "
 174                                           "mismatched sizes, (%ld vs %ld)\n",
 175                                           map->type, map->size,
 176                                           list->map->size);
 177                                 list->map->size = map->size;
 178                         }
 179
 180                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 181                         *maplist = list;
 182                         return 0;
 183                 }
 184
 185                 if (drm_core_has_MTRR(dev)) {
 186                         if (map->type == _DRM_FRAME_BUFFER ||
 187                             (map->flags & _DRM_WRITE_COMBINING)) {
 188                                 map->mtrr = mtrr_add(map->offset, map->size,
 189                                                      MTRR_TYPE_WRCOMB, 1);
 190                         }
 191                 }
 192                 if (map->type == _DRM_REGISTERS)
 193                         map->handle = drm_ioremap(map->offset, map->size, dev);
 194                 break;
 195
 196         case _DRM_SHM:
 197                 map->handle = vmalloc_32(map->size);
 198                 DRM_DEBUG("%lu %d %p\n",
 199                           map->size, drm_order(map->size), map->handle);
 200                 if (!map->handle) {
 201                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 202                         return -ENOMEM;
 203                 }
 204                 map->offset = (unsigned long)map->handle;
 205                 if (map->flags & _DRM_CONTAINS_LOCK) {
 206                         /* Prevent a 2nd X Server from creating a 2nd lock */
 207                         if (dev->lock.hw_lock != NULL) {
 208                                 vfree(map->handle);
 209                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 210                                 return -EBUSY;
 211                         }
 212                         dev->sigdata.lock = dev->lock.hw_lock = map->handle;    /* Pointer to lock */
 213                 }
 214                 break;
 215         case _DRM_AGP:
 216                 if (drm_core_has_AGP(dev)) {
 217 #ifdef __alpha__
 218                         map->offset += dev->hose->mem_space->start;
 219 #endif
 220                         map->offset += dev->agp->base;
 221                         map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 222                 }
 223                 break;
 224         case _DRM_SCATTER_GATHER:
 225                 if (!dev->sg) {
 226                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 227                         return -EINVAL;
 228                 }
 229                 map->offset += (unsigned long)dev->sg->virtual;
 230                 break;
 231         case _DRM_CONSISTENT:
 232                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 233                  * As we're limiting the address to 2^32-1 (or less),
 234                  * casting it down to 32 bits is no problem, but we
 235                  * need to point to a 64bit variable first. */
 236                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 237                 if (!dmah) {
 238                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 239                         return -ENOMEM;
 240                 }
 241                 map->handle = dmah->vaddr;
 242                 map->offset = (unsigned long)dmah->busaddr;
 243                 kfree(dmah);
 244                 break;
 245         default:
 246                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 247                 return -EINVAL;
 248         }
 249
 250         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 251         if (!list) {
 252                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 253                 return -EINVAL;
 254         }
 255         memset(list, 0, sizeof(*list));
 256         list->map = map;
 257
 258         mutex_lock(&dev->struct_mutex);
 259         list_add(&list->head, &dev->maplist->head);
 260         /* Assign a 32-bit handle */
 261         /* We do it here so that dev->struct_mutex protects the increment */
 262         list->user_token = HandleID(map->type == _DRM_SHM
 263                                     ? (unsigned long)map->handle
 264                                     : map->offset, dev);
 265         mutex_unlock(&dev->struct_mutex);
 266
 267         *maplist = list;
 268         return 0;
 269 }
 270
 271 int drm_addmap(drm_device_t * dev, unsigned int offset,
 272                unsigned int size, drm_map_type_t type,
 273                drm_map_flags_t flags, drm_local_map_t ** map_ptr)
 274 {
 275         drm_map_list_t *list;
 276         int rc;
 277
 278         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 279         if (!rc)
 280                 *map_ptr = list->map;
 281         return rc;
 282 }
 283
 284 EXPORT_SYMBOL(drm_addmap);
 285
 286 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
 287                      unsigned int cmd, unsigned long arg)
 288 {
 289         drm_file_t *priv = filp->private_data;
 290         drm_device_t *dev = priv->head->dev;
 291         drm_map_t map;
 292         drm_map_list_t *maplist;
 293         drm_map_t __user *argp = (void __user *)arg;
 294         int err;
 295
 296         if (!(filp->f_mode & 3))
 297                 return -EACCES; /* Require read/write */
 298
 299         if (copy_from_user(&map, argp, sizeof(map))) {
 300                 return -EFAULT;
 301         }
 302
 303         if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
 304                 return -EPERM;
 305
 306         err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
 307                               &maplist);
 308
 309         if (err)
 310                 return err;
 311
 312         if (copy_to_user(argp, maplist->map, sizeof(drm_map_t)))
 313                 return -EFAULT;
 314
 315         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 316         if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
 317                 return -EFAULT;
 318         return 0;
 319 }
 320
 321 /**
 322  * Remove a map private from list and deallocate resources if the mapping
 323  * isn't in use.
 324  *
 325  * \param inode device inode.
 326  * \param filp file pointer.
 327  * \param cmd command.
 328  * \param arg pointer to a drm_map_t structure.
 329  * \return zero on success or a negative value on error.
 330  *
 331  * Searches the map on drm_device::maplist, removes it from the list, see if
 332  * its being used, and free any associate resource (such as MTRR's) if it's not
 333  * being on use.
 334  *
 335  * \sa drm_addmap
 336  */
 337 int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
 338 {
 339         struct list_head *list;
 340         drm_map_list_t *r_list = NULL;
 341         drm_dma_handle_t dmah;
 342
 343         /* Find the list entry for the map and remove it */
 344         list_for_each(list, &dev->maplist->head) {
 345                 r_list = list_entry(list, drm_map_list_t, head);
 346
 347                 if (r_list->map == map) {
 348                         list_del(list);
 349                         drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 350                         break;
 351                 }
 352         }
 353
 354         /* List has wrapped around to the head pointer, or it's empty and we
 355          * didn't find anything.
 356          */
 357         if (list == (&dev->maplist->head)) {
 358                 return -EINVAL;
 359         }
 360
 361         switch (map->type) {
 362         case _DRM_REGISTERS:
 363                 drm_ioremapfree(map->handle, map->size, dev);
 364                 /* FALLTHROUGH */
 365         case _DRM_FRAME_BUFFER:
 366                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 367                         int retcode;
 368                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 369                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 370                 }
 371                 break;
 372         case _DRM_SHM:
 373                 vfree(map->handle);
 374                 break;
 375         case _DRM_AGP:
 376         case _DRM_SCATTER_GATHER:
 377                 break;
 378         case _DRM_CONSISTENT:
 379                 dmah.vaddr = map->handle;
 380                 dmah.busaddr = map->offset;
 381                 dmah.size = map->size;
 382                 __drm_pci_free(dev, &dmah);
 383                 break;
 384         }
 385         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 386
 387         return 0;
 388 }
 389
 390 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
 391 {
 392         int ret;
 393
 394         mutex_lock(&dev->struct_mutex);
 395         ret = drm_rmmap_locked(dev, map);
 396         mutex_unlock(&dev->struct_mutex);
 397
 398         return ret;
 399 }
 400
 401 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 402  * the last close of the device, and this is necessary for cleanup when things
 403  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 404  * like a pointless exercise since they're going away anyway.
 405  *
 406  * One use case might be after addmap is allowed for normal users for SHM and
 407  * gets used by drivers that the server doesn't need to care about.  This seems
 408  * unlikely.
 409  */
 410 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 411                     unsigned int cmd, unsigned long arg)
 412 {
 413         drm_file_t *priv = filp->private_data;
 414         drm_device_t *dev = priv->head->dev;
 415         drm_map_t request;
 416         drm_local_map_t *map = NULL;
 417         struct list_head *list;
 418         int ret;
 419
 420         if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
 421                 return -EFAULT;
 422         }
 423
 424         mutex_lock(&dev->struct_mutex);
 425         list_for_each(list, &dev->maplist->head) {
 426                 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 427
 428                 if (r_list->map &&
 429                     r_list->user_token == (unsigned long)request.handle &&
 430                     r_list->map->flags & _DRM_REMOVABLE) {
 431                         map = r_list->map;
 432                         break;
 433                 }
 434         }
 435
 436         /* List has wrapped around to the head pointer, or its empty we didn't
 437          * find anything.
 438          */
 439         if (list == (&dev->maplist->head)) {
 440                 mutex_unlock(&dev->struct_mutex);
 441                 return -EINVAL;
 442         }
 443
 444         if (!map) {
 445                 mutex_unlock(&dev->struct_mutex);
 446                 return -EINVAL;
 447         }
 448
 449         /* Register and framebuffer maps are permanent */
 450         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 451                 mutex_unlock(&dev->struct_mutex);
 452                 return 0;
 453         }
 454
 455         ret = drm_rmmap_locked(dev, map);
 456
 457         mutex_unlock(&dev->struct_mutex);
 458
 459         return ret;
 460 }
 461
 462 /**
 463  * Cleanup after an error on one of the addbufs() functions.
 464  *
 465  * \param dev DRM device.
 466  * \param entry buffer entry where the error occurred.
 467  *
 468  * Frees any pages and buffers associated with the given entry.
 469  */
 470 static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
 471 {
 472         int i;
 473
 474         if (entry->seg_count) {
 475                 for (i = 0; i < entry->seg_count; i++) {
 476                         if (entry->seglist[i]) {
 477                                 drm_pci_free(dev, entry->seglist[i]);
 478                         }
 479                 }
 480                 drm_free(entry->seglist,
 481                          entry->seg_count *
 482                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 483
 484                 entry->seg_count = 0;
 485         }
 486
 487         if (entry->buf_count) {
 488                 for (i = 0; i < entry->buf_count; i++) {
 489                         if (entry->buflist[i].dev_private) {
 490                                 drm_free(entry->buflist[i].dev_private,
 491                                          entry->buflist[i].dev_priv_size,
 492                                          DRM_MEM_BUFS);
 493                         }
 494                 }
 495                 drm_free(entry->buflist,
 496                          entry->buf_count *
 497                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 498
 499                 entry->buf_count = 0;
 500         }
 501 }
 502
 503 #if __OS_HAS_AGP
 504 /**
 505  * Add AGP buffers for DMA transfers.
 506  *
 507  * \param dev drm_device_t to which the buffers are to be added.
 508  * \param request pointer to a drm_buf_desc_t describing the request.
 509  * \return zero on success or a negative number on failure.
 510  *
 511  * After some sanity checks creates a drm_buf structure for each buffer and
 512  * reallocates the buffer list of the same size order to accommodate the new
 513  * buffers.
 514  */
 515 int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
 516 {
 517         drm_device_dma_t *dma = dev->dma;
 518         drm_buf_entry_t *entry;
 519         drm_buf_t *buf;
 520         unsigned long offset;
 521         unsigned long agp_offset;
 522         int count;
 523         int order;
 524         int size;
 525         int alignment;
 526         int page_order;
 527         int total;
 528         int byte_count;
 529         int i;
 530         drm_buf_t **temp_buflist;
 531
 532         if (!dma)
 533                 return -EINVAL;
 534
 535         count = request->count;
 536         order = drm_order(request->size);
 537         size = 1 << order;
 538
 539         alignment = (request->flags & _DRM_PAGE_ALIGN)
 540             ? PAGE_ALIGN(size) : size;
 541         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 542         total = PAGE_SIZE << page_order;
 543
 544         byte_count = 0;
 545         agp_offset = dev->agp->base + request->agp_start;
 546
 547         DRM_DEBUG("count:      %d\n", count);
 548         DRM_DEBUG("order:      %d\n", order);
 549         DRM_DEBUG("size:       %d\n", size);
 550         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 551         DRM_DEBUG("alignment:  %d\n", alignment);
 552         DRM_DEBUG("page_order: %d\n", page_order);
 553         DRM_DEBUG("total:      %d\n", total);
 554
 555         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 556                 return -EINVAL;
 557         if (dev->queue_count)
 558                 return -EBUSY;  /* Not while in use */
 559
 560         spin_lock(&dev->count_lock);
 561         if (dev->buf_use) {
 562                 spin_unlock(&dev->count_lock);
 563                 return -EBUSY;
 564         }
 565         atomic_inc(&dev->buf_alloc);
 566         spin_unlock(&dev->count_lock);
 567
 568         mutex_lock(&dev->struct_mutex);
 569         entry = &dma->bufs[order];
 570         if (entry->buf_count) {
 571                 mutex_unlock(&dev->struct_mutex);
 572                 atomic_dec(&dev->buf_alloc);
 573                 return -ENOMEM; /* May only call once for each order */
 574         }
 575
 576         if (count < 0 || count > 4096) {
 577                 mutex_unlock(&dev->struct_mutex);
 578                 atomic_dec(&dev->buf_alloc);
 579                 return -EINVAL;
 580         }
 581
 582         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 583                                    DRM_MEM_BUFS);
 584         if (!entry->buflist) {
 585                 mutex_unlock(&dev->struct_mutex);
 586                 atomic_dec(&dev->buf_alloc);
 587                 return -ENOMEM;
 588         }
 589         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 590
 591         entry->buf_size = size;
 592         entry->page_order = page_order;
 593
 594         offset = 0;
 595
 596         while (entry->buf_count < count) {
 597                 buf = &entry->buflist[entry->buf_count];
 598                 buf->idx = dma->buf_count + entry->buf_count;
 599                 buf->total = alignment;
 600                 buf->order = order;
 601                 buf->used = 0;
 602
 603                 buf->offset = (dma->byte_count + offset);
 604                 buf->bus_address = agp_offset + offset;
 605                 buf->address = (void *)(agp_offset + offset);
 606                 buf->next = NULL;
 607                 buf->waiting = 0;
 608                 buf->pending = 0;
 609                 init_waitqueue_head(&buf->dma_wait);
 610                 buf->filp = NULL;
 611
 612                 buf->dev_priv_size = dev->driver->dev_priv_size;
 613                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 614                 if (!buf->dev_private) {
 615                         /* Set count correctly so we free the proper amount. */
 616                         entry->buf_count = count;
 617                         drm_cleanup_buf_error(dev, entry);
 618                         mutex_unlock(&dev->struct_mutex);
 619                         atomic_dec(&dev->buf_alloc);
 620                         return -ENOMEM;
 621                 }
 622                 memset(buf->dev_private, 0, buf->dev_priv_size);
 623
 624                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 625
 626                 offset += alignment;
 627                 entry->buf_count++;
 628                 byte_count += PAGE_SIZE << page_order;
 629         }
 630
 631         DRM_DEBUG("byte_count: %d\n", byte_count);
 632
 633         temp_buflist = drm_realloc(dma->buflist,
 634                                    dma->buf_count * sizeof(*dma->buflist),
 635                                    (dma->buf_count + entry->buf_count)
 636                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 637         if (!temp_buflist) {
 638                 /* Free the entry because it isn't valid */
 639                 drm_cleanup_buf_error(dev, entry);
 640                 mutex_unlock(&dev->struct_mutex);
 641                 atomic_dec(&dev->buf_alloc);
 642                 return -ENOMEM;
 643         }
 644         dma->buflist = temp_buflist;
 645
 646         for (i = 0; i < entry->buf_count; i++) {
 647                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 648         }
 649
 650         dma->buf_count += entry->buf_count;
 651         dma->seg_count += entry->seg_count;
 652         dma->page_count += byte_count >> PAGE_SHIFT;
 653         dma->byte_count += byte_count;
 654
 655         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 656         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 657
 658         mutex_unlock(&dev->struct_mutex);
 659
 660         request->count = entry->buf_count;
 661         request->size = size;
 662
 663         dma->flags = _DRM_DMA_USE_AGP;
 664
 665         atomic_dec(&dev->buf_alloc);
 666         return 0;
 667 }
 668 EXPORT_SYMBOL(drm_addbufs_agp);
 669 #endif                          /* __OS_HAS_AGP */
 670
 671 int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
 672 {
 673         drm_device_dma_t *dma = dev->dma;
 674         int count;
 675         int order;
 676         int size;
 677         int total;
 678         int page_order;
 679         drm_buf_entry_t *entry;
 680         drm_dma_handle_t *dmah;
 681         drm_buf_t *buf;
 682         int alignment;
 683         unsigned long offset;
 684         int i;
 685         int byte_count;
 686         int page_count;
 687         unsigned long *temp_pagelist;
 688         drm_buf_t **temp_buflist;
 689
 690         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 691                 return -EINVAL;
 692
 693         if (!dma)
 694                 return -EINVAL;
 695
 696         if (!capable(CAP_SYS_ADMIN))
 697                 return -EPERM;
 698
 699         count = request->count;
 700         order = drm_order(request->size);
 701         size = 1 << order;
 702
 703         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 704                   request->count, request->size, size, order, dev->queue_count);
 705
 706         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 707                 return -EINVAL;
 708         if (dev->queue_count)
 709                 return -EBUSY;  /* Not while in use */
 710
 711         alignment = (request->flags & _DRM_PAGE_ALIGN)
 712             ? PAGE_ALIGN(size) : size;
 713         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 714         total = PAGE_SIZE << page_order;
 715
 716         spin_lock(&dev->count_lock);
 717         if (dev->buf_use) {
 718                 spin_unlock(&dev->count_lock);
 719                 return -EBUSY;
 720         }
 721         atomic_inc(&dev->buf_alloc);
 722         spin_unlock(&dev->count_lock);
 723
 724         mutex_lock(&dev->struct_mutex);
 725         entry = &dma->bufs[order];
 726         if (entry->buf_count) {
 727                 mutex_unlock(&dev->struct_mutex);
 728                 atomic_dec(&dev->buf_alloc);
 729                 return -ENOMEM; /* May only call once for each order */
 730         }
 731
 732         if (count < 0 || count > 4096) {
 733                 mutex_unlock(&dev->struct_mutex);
 734                 atomic_dec(&dev->buf_alloc);
 735                 return -EINVAL;
 736         }
 737
 738         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 739                                    DRM_MEM_BUFS);
 740         if (!entry->buflist) {
 741                 mutex_unlock(&dev->struct_mutex);
 742                 atomic_dec(&dev->buf_alloc);
 743                 return -ENOMEM;
 744         }
 745         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 746
 747         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 748                                    DRM_MEM_SEGS);
 749         if (!entry->seglist) {
 750                 drm_free(entry->buflist,
 751                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 752                 mutex_unlock(&dev->struct_mutex);
 753                 atomic_dec(&dev->buf_alloc);
 754                 return -ENOMEM;
 755         }
 756         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 757
 758         /* Keep the original pagelist until we know all the allocations
 759          * have succeeded
 760          */
 761         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 762                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 763         if (!temp_pagelist) {
 764                 drm_free(entry->buflist,
 765                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 766                 drm_free(entry->seglist,
 767                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 768                 mutex_unlock(&dev->struct_mutex);
 769                 atomic_dec(&dev->buf_alloc);
 770                 return -ENOMEM;
 771         }
 772         memcpy(temp_pagelist,
 773                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 774         DRM_DEBUG("pagelist: %d entries\n",
 775                   dma->page_count + (count << page_order));
 776
 777         entry->buf_size = size;
 778         entry->page_order = page_order;
 779         byte_count = 0;
 780         page_count = 0;
 781
 782         while (entry->buf_count < count) {
 783
 784                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 785
 786                 if (!dmah) {
 787                         /* Set count correctly so we free the proper amount. */
 788                         entry->buf_count = count;
 789                         entry->seg_count = count;
 790                         drm_cleanup_buf_error(dev, entry);
 791                         drm_free(temp_pagelist,
 792                                  (dma->page_count + (count << page_order))
 793                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 794                         mutex_unlock(&dev->struct_mutex);
 795                         atomic_dec(&dev->buf_alloc);
 796                         return -ENOMEM;
 797                 }
 798                 entry->seglist[entry->seg_count++] = dmah;
 799                 for (i = 0; i < (1 << page_order); i++) {
 800                         DRM_DEBUG("page %d @ 0x%08lx\n",
 801                                   dma->page_count + page_count,
 802                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 803                         temp_pagelist[dma->page_count + page_count++]
 804                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 805                 }
 806                 for (offset = 0;
 807                      offset + size <= total && entry->buf_count < count;
 808                      offset += alignment, ++entry->buf_count) {
 809                         buf = &entry->buflist[entry->buf_count];
 810                         buf->idx = dma->buf_count + entry->buf_count;
 811                         buf->total = alignment;
 812                         buf->order = order;
 813                         buf->used = 0;
 814                         buf->offset = (dma->byte_count + byte_count + offset);
 815                         buf->address = (void *)(dmah->vaddr + offset);
 816                         buf->bus_address = dmah->busaddr + offset;
 817                         buf->next = NULL;
 818                         buf->waiting = 0;
 819                         buf->pending = 0;
 820                         init_waitqueue_head(&buf->dma_wait);
 821                         buf->filp = NULL;
 822
 823                         buf->dev_priv_size = dev->driver->dev_priv_size;
 824                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 825                                                      DRM_MEM_BUFS);
 826                         if (!buf->dev_private) {
 827                                 /* Set count correctly so we free the proper amount. */
 828                                 entry->buf_count = count;
 829                                 entry->seg_count = count;
 830                                 drm_cleanup_buf_error(dev, entry);
 831                                 drm_free(temp_pagelist,
 832                                          (dma->page_count +
 833                                           (count << page_order))
 834                                          * sizeof(*dma->pagelist),
 835                                          DRM_MEM_PAGES);
 836                                 mutex_unlock(&dev->struct_mutex);
 837                                 atomic_dec(&dev->buf_alloc);
 838                                 return -ENOMEM;
 839                         }
 840                         memset(buf->dev_private, 0, buf->dev_priv_size);
 841
 842                         DRM_DEBUG("buffer %d @ %p\n",
 843                                   entry->buf_count, buf->address);
 844                 }
 845                 byte_count += PAGE_SIZE << page_order;
 846         }
 847
 848         temp_buflist = drm_realloc(dma->buflist,
 849                                    dma->buf_count * sizeof(*dma->buflist),
 850                                    (dma->buf_count + entry->buf_count)
 851                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 852         if (!temp_buflist) {
 853                 /* Free the entry because it isn't valid */
 854                 drm_cleanup_buf_error(dev, entry);
 855                 drm_free(temp_pagelist,
 856                          (dma->page_count + (count << page_order))
 857                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 858                 mutex_unlock(&dev->struct_mutex);
 859                 atomic_dec(&dev->buf_alloc);
 860                 return -ENOMEM;
 861         }
 862         dma->buflist = temp_buflist;
 863
 864         for (i = 0; i < entry->buf_count; i++) {
 865                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 866         }
 867
 868         /* No allocations failed, so now we can replace the orginal pagelist
 869          * with the new one.
 870          */
 871         if (dma->page_count) {
 872                 drm_free(dma->pagelist,
 873                          dma->page_count * sizeof(*dma->pagelist),
 874                          DRM_MEM_PAGES);
 875         }
 876         dma->pagelist = temp_pagelist;
 877
 878         dma->buf_count += entry->buf_count;
 879         dma->seg_count += entry->seg_count;
 880         dma->page_count += entry->seg_count << page_order;
 881         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 882
 883         mutex_unlock(&dev->struct_mutex);
 884
 885         request->count = entry->buf_count;
 886         request->size = size;
 887
 888         atomic_dec(&dev->buf_alloc);
 889         return 0;
 890
 891 }
 892 EXPORT_SYMBOL(drm_addbufs_pci);
 893
 894 static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
 895 {
 896         drm_device_dma_t *dma = dev->dma;
 897         drm_buf_entry_t *entry;
 898         drm_buf_t *buf;
 899         unsigned long offset;
 900         unsigned long agp_offset;
 901         int count;
 902         int order;
 903         int size;
 904         int alignment;
 905         int page_order;
 906         int total;
 907         int byte_count;
 908         int i;
 909         drm_buf_t **temp_buflist;
 910
 911         if (!drm_core_check_feature(dev, DRIVER_SG))
 912                 return -EINVAL;
 913
 914         if (!dma)
 915                 return -EINVAL;
 916
 917         if (!capable(CAP_SYS_ADMIN))
 918                 return -EPERM;
 919
 920         count = request->count;
 921         order = drm_order(request->size);
 922         size = 1 << order;
 923
 924         alignment = (request->flags & _DRM_PAGE_ALIGN)
 925             ? PAGE_ALIGN(size) : size;
 926         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 927         total = PAGE_SIZE << page_order;
 928
 929         byte_count = 0;
 930         agp_offset = request->agp_start;
 931
 932         DRM_DEBUG("count:      %d\n", count);
 933         DRM_DEBUG("order:      %d\n", order);
 934         DRM_DEBUG("size:       %d\n", size);
 935         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 936         DRM_DEBUG("alignment:  %d\n", alignment);
 937         DRM_DEBUG("page_order: %d\n", page_order);
 938         DRM_DEBUG("total:      %d\n", total);
 939
 940         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 941                 return -EINVAL;
 942         if (dev->queue_count)
 943                 return -EBUSY;  /* Not while in use */
 944
 945         spin_lock(&dev->count_lock);
 946         if (dev->buf_use) {
 947                 spin_unlock(&dev->count_lock);
 948                 return -EBUSY;
 949         }
 950         atomic_inc(&dev->buf_alloc);
 951         spin_unlock(&dev->count_lock);
 952
 953         mutex_lock(&dev->struct_mutex);
 954         entry = &dma->bufs[order];
 955         if (entry->buf_count) {
 956                 mutex_unlock(&dev->struct_mutex);
 957                 atomic_dec(&dev->buf_alloc);
 958                 return -ENOMEM; /* May only call once for each order */
 959         }
 960
 961         if (count < 0 || count > 4096) {
 962                 mutex_unlock(&dev->struct_mutex);
 963                 atomic_dec(&dev->buf_alloc);
 964                 return -EINVAL;
 965         }
 966
 967         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 968                                    DRM_MEM_BUFS);
 969         if (!entry->buflist) {
 970                 mutex_unlock(&dev->struct_mutex);
 971                 atomic_dec(&dev->buf_alloc);
 972                 return -ENOMEM;
 973         }
 974         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 975
 976         entry->buf_size = size;
 977         entry->page_order = page_order;
 978
 979         offset = 0;
 980
 981         while (entry->buf_count < count) {
 982                 buf = &entry->buflist[entry->buf_count];
 983                 buf->idx = dma->buf_count + entry->buf_count;
 984                 buf->total = alignment;
 985                 buf->order = order;
 986                 buf->used = 0;
 987
 988                 buf->offset = (dma->byte_count + offset);
 989                 buf->bus_address = agp_offset + offset;
 990                 buf->address = (void *)(agp_offset + offset
 991                                         + (unsigned long)dev->sg->virtual);
 992                 buf->next = NULL;
 993                 buf->waiting = 0;
 994                 buf->pending = 0;
 995                 init_waitqueue_head(&buf->dma_wait);
 996                 buf->filp = NULL;
 997
 998                 buf->dev_priv_size = dev->driver->dev_priv_size;
 999                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1000                 if (!buf->dev_private) {
1001                         /* Set count correctly so we free the proper amount. */
1002                         entry->buf_count = count;
1003                         drm_cleanup_buf_error(dev, entry);
1004                         mutex_unlock(&dev->struct_mutex);
1005                         atomic_dec(&dev->buf_alloc);
1006                         return -ENOMEM;
1007                 }
1008
1009                 memset(buf->dev_private, 0, buf->dev_priv_size);
1010
1011                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1012
1013                 offset += alignment;
1014                 entry->buf_count++;
1015                 byte_count += PAGE_SIZE << page_order;
1016         }
1017
1018         DRM_DEBUG("byte_count: %d\n", byte_count);
1019
1020         temp_buflist = drm_realloc(dma->buflist,
1021                                    dma->buf_count * sizeof(*dma->buflist),
1022                                    (dma->buf_count + entry->buf_count)
1023                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1024         if (!temp_buflist) {
1025                 /* Free the entry because it isn't valid */
1026                 drm_cleanup_buf_error(dev, entry);
1027                 mutex_unlock(&dev->struct_mutex);
1028                 atomic_dec(&dev->buf_alloc);
1029                 return -ENOMEM;
1030         }
1031         dma->buflist = temp_buflist;
1032
1033         for (i = 0; i < entry->buf_count; i++) {
1034                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1035         }
1036
1037         dma->buf_count += entry->buf_count;
1038         dma->seg_count += entry->seg_count;
1039         dma->page_count += byte_count >> PAGE_SHIFT;
1040         dma->byte_count += byte_count;
1041
1042         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1043         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1044
1045         mutex_unlock(&dev->struct_mutex);
1046
1047         request->count = entry->buf_count;
1048         request->size = size;
1049
1050         dma->flags = _DRM_DMA_USE_SG;
1051
1052         atomic_dec(&dev->buf_alloc);
1053         return 0;
1054 }
1055
1056 static int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
1057 {
1058         drm_device_dma_t *dma = dev->dma;
1059         drm_buf_entry_t *entry;
1060         drm_buf_t *buf;
1061         unsigned long offset;
1062         unsigned long agp_offset;
1063         int count;
1064         int order;
1065         int size;
1066         int alignment;
1067         int page_order;
1068         int total;
1069         int byte_count;
1070         int i;
1071         drm_buf_t **temp_buflist;
1072
1073         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1074                 return -EINVAL;
1075
1076         if (!dma)
1077                 return -EINVAL;
1078
1079         if (!capable(CAP_SYS_ADMIN))
1080                 return -EPERM;
1081
1082         count = request->count;
1083         order = drm_order(request->size);
1084         size = 1 << order;
1085
1086         alignment = (request->flags & _DRM_PAGE_ALIGN)
1087             ? PAGE_ALIGN(size) : size;
1088         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1089         total = PAGE_SIZE << page_order;
1090
1091         byte_count = 0;
1092         agp_offset = request->agp_start;
1093
1094         DRM_DEBUG("count:      %d\n", count);
1095         DRM_DEBUG("order:      %d\n", order);
1096         DRM_DEBUG("size:       %d\n", size);
1097         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1098         DRM_DEBUG("alignment:  %d\n", alignment);
1099         DRM_DEBUG("page_order: %d\n", page_order);
1100         DRM_DEBUG("total:      %d\n", total);
1101
1102         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1103                 return -EINVAL;
1104         if (dev->queue_count)
1105                 return -EBUSY;  /* Not while in use */
1106
1107         spin_lock(&dev->count_lock);
1108         if (dev->buf_use) {
1109                 spin_unlock(&dev->count_lock);
1110                 return -EBUSY;
1111         }
1112         atomic_inc(&dev->buf_alloc);
1113         spin_unlock(&dev->count_lock);
1114
1115         mutex_lock(&dev->struct_mutex);
1116         entry = &dma->bufs[order];
1117         if (entry->buf_count) {
1118                 mutex_unlock(&dev->struct_mutex);
1119                 atomic_dec(&dev->buf_alloc);
1120                 return -ENOMEM; /* May only call once for each order */
1121         }
1122
1123         if (count < 0 || count > 4096) {
1124                 mutex_unlock(&dev->struct_mutex);
1125                 atomic_dec(&dev->buf_alloc);
1126                 return -EINVAL;
1127         }
1128
1129         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1130                                    DRM_MEM_BUFS);
1131         if (!entry->buflist) {
1132                 mutex_unlock(&dev->struct_mutex);
1133                 atomic_dec(&dev->buf_alloc);
1134                 return -ENOMEM;
1135         }
1136         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1137
1138         entry->buf_size = size;
1139         entry->page_order = page_order;
1140
1141         offset = 0;
1142
1143         while (entry->buf_count < count) {
1144                 buf = &entry->buflist[entry->buf_count];
1145                 buf->idx = dma->buf_count + entry->buf_count;
1146                 buf->total = alignment;
1147                 buf->order = order;
1148                 buf->used = 0;
1149
1150                 buf->offset = (dma->byte_count + offset);
1151                 buf->bus_address = agp_offset + offset;
1152                 buf->address = (void *)(agp_offset + offset);
1153                 buf->next = NULL;
1154                 buf->waiting = 0;
1155                 buf->pending = 0;
1156                 init_waitqueue_head(&buf->dma_wait);
1157                 buf->filp = NULL;
1158
1159                 buf->dev_priv_size = dev->driver->dev_priv_size;
1160                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1161                 if (!buf->dev_private) {
1162                         /* Set count correctly so we free the proper amount. */
1163                         entry->buf_count = count;
1164                         drm_cleanup_buf_error(dev, entry);
1165                         mutex_unlock(&dev->struct_mutex);
1166                         atomic_dec(&dev->buf_alloc);
1167                         return -ENOMEM;
1168                 }
1169                 memset(buf->dev_private, 0, buf->dev_priv_size);
1170
1171                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1172
1173                 offset += alignment;
1174                 entry->buf_count++;
1175                 byte_count += PAGE_SIZE << page_order;
1176         }
1177
1178         DRM_DEBUG("byte_count: %d\n", byte_count);
1179
1180         temp_buflist = drm_realloc(dma->buflist,
1181                                    dma->buf_count * sizeof(*dma->buflist),
1182                                    (dma->buf_count + entry->buf_count)
1183                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1184         if (!temp_buflist) {
1185                 /* Free the entry because it isn't valid */
1186                 drm_cleanup_buf_error(dev, entry);
1187                 mutex_unlock(&dev->struct_mutex);
1188                 atomic_dec(&dev->buf_alloc);
1189                 return -ENOMEM;
1190         }
1191         dma->buflist = temp_buflist;
1192
1193         for (i = 0; i < entry->buf_count; i++) {
1194                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1195         }
1196
1197         dma->buf_count += entry->buf_count;
1198         dma->seg_count += entry->seg_count;
1199         dma->page_count += byte_count >> PAGE_SHIFT;
1200         dma->byte_count += byte_count;
1201
1202         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1203         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1204
1205         mutex_unlock(&dev->struct_mutex);
1206
1207         request->count = entry->buf_count;
1208         request->size = size;
1209
1210         dma->flags = _DRM_DMA_USE_FB;
1211
1212         atomic_dec(&dev->buf_alloc);
1213         return 0;
1214 }
1215
1216
1217 /**
1218  * Add buffers for DMA transfers (ioctl).
1219  *
1220  * \param inode device inode.
1221  * \param filp file pointer.
1222  * \param cmd command.
1223  * \param arg pointer to a drm_buf_desc_t request.
1224  * \return zero on success or a negative number on failure.
1225  *
1226  * According with the memory type specified in drm_buf_desc::flags and the
1227  * build options, it dispatches the call either to addbufs_agp(),
1228  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1229  * PCI memory respectively.
1230  */
1231 int drm_addbufs(struct inode *inode, struct file *filp,
1232                 unsigned int cmd, unsigned long arg)
1233 {
1234         drm_buf_desc_t request;
1235         drm_file_t *priv = filp->private_data;
1236         drm_device_t *dev = priv->head->dev;
1237         int ret;
1238
1239         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1240                 return -EINVAL;
1241
1242         if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
1243                            sizeof(request)))
1244                 return -EFAULT;
1245
1246 #if __OS_HAS_AGP
1247         if (request.flags & _DRM_AGP_BUFFER)
1248                 ret = drm_addbufs_agp(dev, &request);
1249         else
1250 #endif
1251         if (request.flags & _DRM_SG_BUFFER)
1252                 ret = drm_addbufs_sg(dev, &request);
1253         else if (request.flags & _DRM_FB_BUFFER)
1254                 ret = drm_addbufs_fb(dev, &request);
1255         else
1256                 ret = drm_addbufs_pci(dev, &request);
1257
1258         if (ret == 0) {
1259                 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1260                         ret = -EFAULT;
1261                 }
1262         }
1263         return ret;
1264 }
1265
1266 /**
1267  * Get information about the buffer mappings.
1268  *
1269  * This was originally mean for debugging purposes, or by a sophisticated
1270  * client library to determine how best to use the available buffers (e.g.,
1271  * large buffers can be used for image transfer).
1272  *
1273  * \param inode device inode.
1274  * \param filp file pointer.
1275  * \param cmd command.
1276  * \param arg pointer to a drm_buf_info structure.
1277  * \return zero on success or a negative number on failure.
1278  *
1279  * Increments drm_device::buf_use while holding the drm_device::count_lock
1280  * lock, preventing of allocating more buffers after this call. Information
1281  * about each requested buffer is then copied into user space.
1282  */
1283 int drm_infobufs(struct inode *inode, struct file *filp,
1284                  unsigned int cmd, unsigned long arg)
1285 {
1286         drm_file_t *priv = filp->private_data;
1287         drm_device_t *dev = priv->head->dev;
1288         drm_device_dma_t *dma = dev->dma;
1289         drm_buf_info_t request;
1290         drm_buf_info_t __user *argp = (void __user *)arg;
1291         int i;
1292         int count;
1293
1294         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1295                 return -EINVAL;
1296
1297         if (!dma)
1298                 return -EINVAL;
1299
1300         spin_lock(&dev->count_lock);
1301         if (atomic_read(&dev->buf_alloc)) {
1302                 spin_unlock(&dev->count_lock);
1303                 return -EBUSY;
1304         }
1305         ++dev->buf_use;         /* Can't allocate more after this call */
1306         spin_unlock(&dev->count_lock);
1307
1308         if (copy_from_user(&request, argp, sizeof(request)))
1309                 return -EFAULT;
1310
1311         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1312                 if (dma->bufs[i].buf_count)
1313                         ++count;
1314         }
1315
1316         DRM_DEBUG("count = %d\n", count);
1317
1318         if (request.count >= count) {
1319                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1320                         if (dma->bufs[i].buf_count) {
1321                                 drm_buf_desc_t __user *to =
1322                                     &request.list[count];
1323                                 drm_buf_entry_t *from = &dma->bufs[i];
1324                                 drm_freelist_t *list = &dma->bufs[i].freelist;
1325                                 if (copy_to_user(&to->count,
1326                                                  &from->buf_count,
1327                                                  sizeof(from->buf_count)) ||
1328                                     copy_to_user(&to->size,
1329                                                  &from->buf_size,
1330                                                  sizeof(from->buf_size)) ||
1331                                     copy_to_user(&to->low_mark,
1332                                                  &list->low_mark,
1333                                                  sizeof(list->low_mark)) ||
1334                                     copy_to_user(&to->high_mark,
1335                                                  &list->high_mark,
1336                                                  sizeof(list->high_mark)))
1337                                         return -EFAULT;
1338
1339                                 DRM_DEBUG("%d %d %d %d %d\n",
1340                                           i,
1341                                           dma->bufs[i].buf_count,
1342                                           dma->bufs[i].buf_size,
1343                                           dma->bufs[i].freelist.low_mark,
1344                                           dma->bufs[i].freelist.high_mark);
1345                                 ++count;
1346                         }
1347                 }
1348         }
1349         request.count = count;
1350
1351         if (copy_to_user(argp, &request, sizeof(request)))
1352                 return -EFAULT;
1353
1354         return 0;
1355 }
1356
1357 /**
1358  * Specifies a low and high water mark for buffer allocation
1359  *
1360  * \param inode device inode.
1361  * \param filp file pointer.
1362  * \param cmd command.
1363  * \param arg a pointer to a drm_buf_desc structure.
1364  * \return zero on success or a negative number on failure.
1365  *
1366  * Verifies that the size order is bounded between the admissible orders and
1367  * updates the respective drm_device_dma::bufs entry low and high water mark.
1368  *
1369  * \note This ioctl is deprecated and mostly never used.
1370  */
1371 int drm_markbufs(struct inode *inode, struct file *filp,
1372                  unsigned int cmd, unsigned long arg)
1373 {
1374         drm_file_t *priv = filp->private_data;
1375         drm_device_t *dev = priv->head->dev;
1376         drm_device_dma_t *dma = dev->dma;
1377         drm_buf_desc_t request;
1378         int order;
1379         drm_buf_entry_t *entry;
1380
1381         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1382                 return -EINVAL;
1383
1384         if (!dma)
1385                 return -EINVAL;
1386
1387         if (copy_from_user(&request,
1388                            (drm_buf_desc_t __user *) arg, sizeof(request)))
1389                 return -EFAULT;
1390
1391         DRM_DEBUG("%d, %d, %d\n",
1392                   request.size, request.low_mark, request.high_mark);
1393         order = drm_order(request.size);
1394         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1395                 return -EINVAL;
1396         entry = &dma->bufs[order];
1397
1398         if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1399                 return -EINVAL;
1400         if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1401                 return -EINVAL;
1402
1403         entry->freelist.low_mark = request.low_mark;
1404         entry->freelist.high_mark = request.high_mark;
1405
1406         return 0;
1407 }
1408
1409 /**
1410  * Unreserve the buffers in list, previously reserved using drmDMA.
1411  *
1412  * \param inode device inode.
1413  * \param filp file pointer.
1414  * \param cmd command.
1415  * \param arg pointer to a drm_buf_free structure.
1416  * \return zero on success or a negative number on failure.
1417  *
1418  * Calls free_buffer() for each used buffer.
1419  * This function is primarily used for debugging.
1420  */
1421 int drm_freebufs(struct inode *inode, struct file *filp,
1422                  unsigned int cmd, unsigned long arg)
1423 {
1424         drm_file_t *priv = filp->private_data;
1425         drm_device_t *dev = priv->head->dev;
1426         drm_device_dma_t *dma = dev->dma;
1427         drm_buf_free_t request;
1428         int i;
1429         int idx;
1430         drm_buf_t *buf;
1431
1432         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1433                 return -EINVAL;
1434
1435         if (!dma)
1436                 return -EINVAL;
1437
1438         if (copy_from_user(&request,
1439                            (drm_buf_free_t __user *) arg, sizeof(request)))
1440                 return -EFAULT;
1441
1442         DRM_DEBUG("%d\n", request.count);
1443         for (i = 0; i < request.count; i++) {
1444                 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1445                         return -EFAULT;
1446                 if (idx < 0 || idx >= dma->buf_count) {
1447                         DRM_ERROR("Index %d (of %d max)\n",
1448                                   idx, dma->buf_count - 1);
1449                         return -EINVAL;
1450                 }
1451                 buf = dma->buflist[idx];
1452                 if (buf->filp != filp) {
1453                         DRM_ERROR("Process %d freeing buffer not owned\n",
1454                                   current->pid);
1455                         return -EINVAL;
1456                 }
1457                 drm_free_buffer(dev, buf);
1458         }
1459
1460         return 0;
1461 }
1462
1463 /**
1464  * Maps all of the DMA buffers into client-virtual space (ioctl).
1465  *
1466  * \param inode device inode.
1467  * \param filp file pointer.
1468  * \param cmd command.
1469  * \param arg pointer to a drm_buf_map structure.
1470  * \return zero on success or a negative number on failure.
1471  *
1472  * Maps the AGP or SG buffer region with do_mmap(), and copies information
1473  * about each buffer into user space. The PCI buffers are already mapped on the
1474  * addbufs_pci() call.
1475  */
1476 int drm_mapbufs(struct inode *inode, struct file *filp,
1477                 unsigned int cmd, unsigned long arg)
1478 {
1479         drm_file_t *priv = filp->private_data;
1480         drm_device_t *dev = priv->head->dev;
1481         drm_device_dma_t *dma = dev->dma;
1482         drm_buf_map_t __user *argp = (void __user *)arg;
1483         int retcode = 0;
1484         const int zero = 0;
1485         unsigned long virtual;
1486         unsigned long address;
1487         drm_buf_map_t request;
1488         int i;
1489
1490         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1491                 return -EINVAL;
1492
1493         if (!dma)
1494                 return -EINVAL;
1495
1496         spin_lock(&dev->count_lock);
1497         if (atomic_read(&dev->buf_alloc)) {
1498                 spin_unlock(&dev->count_lock);
1499                 return -EBUSY;
1500         }
1501         dev->buf_use++;         /* Can't allocate more after this call */
1502         spin_unlock(&dev->count_lock);
1503
1504         if (copy_from_user(&request, argp, sizeof(request)))
1505                 return -EFAULT;
1506
1507         if (request.count >= dma->buf_count) {
1508                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1509                     || (drm_core_check_feature(dev, DRIVER_SG)
1510                         && (dma->flags & _DRM_DMA_USE_SG))
1511                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1512                         && (dma->flags & _DRM_DMA_USE_FB))) {
1513                         drm_map_t *map = dev->agp_buffer_map;
1514                         unsigned long token = dev->agp_buffer_token;
1515
1516                         if (!map) {
1517                                 retcode = -EINVAL;
1518                                 goto done;
1519                         }
1520
1521                         down_write(&current->mm->mmap_sem);
1522                         virtual = do_mmap(filp, 0, map->size,
1523                                           PROT_READ | PROT_WRITE,
1524                                           MAP_SHARED, token);
1525                         up_write(&current->mm->mmap_sem);
1526                 } else {
1527                         down_write(&current->mm->mmap_sem);
1528                         virtual = do_mmap(filp, 0, dma->byte_count,
1529                                           PROT_READ | PROT_WRITE,
1530                                           MAP_SHARED, 0);
1531                         up_write(&current->mm->mmap_sem);
1532                 }
1533                 if (virtual > -1024UL) {
1534                         /* Real error */
1535                         retcode = (signed long)virtual;
1536                         goto done;
1537                 }
1538                 request.virtual = (void __user *)virtual;
1539
1540                 for (i = 0; i < dma->buf_count; i++) {
1541                         if (copy_to_user(&request.list[i].idx,
1542                                          &dma->buflist[i]->idx,
1543                                          sizeof(request.list[0].idx))) {
1544                                 retcode = -EFAULT;
1545                                 goto done;
1546                         }
1547                         if (copy_to_user(&request.list[i].total,
1548                                          &dma->buflist[i]->total,
1549                                          sizeof(request.list[0].total))) {
1550                                 retcode = -EFAULT;
1551                                 goto done;
1552                         }
1553                         if (copy_to_user(&request.list[i].used,
1554                                          &zero, sizeof(zero))) {
1555                                 retcode = -EFAULT;
1556                                 goto done;
1557                         }
1558                         address = virtual + dma->buflist[i]->offset;    /* *** */
1559                         if (copy_to_user(&request.list[i].address,
1560                                          &address, sizeof(address))) {
1561                                 retcode = -EFAULT;
1562                                 goto done;
1563                         }
1564                 }
1565         }
1566       done:
1567         request.count = dma->buf_count;
1568         DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1569
1570         if (copy_to_user(argp, &request, sizeof(request)))
1571                 return -EFAULT;
1572
1573         return retcode;
1574 }
1575
1576 /**
1577  * Compute size order.  Returns the exponent of the smaller power of two which
1578  * is greater or equal to given number.
1579  *
1580  * \param size size.
1581  * \return order.
1582  *
1583  * \todo Can be made faster.
1584  */
1585 int drm_order(unsigned long size)
1586 {
1587         int order;
1588         unsigned long tmp;
1589
1590         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1591
1592         if (size & (size - 1))
1593                 ++order;
1594
1595         return order;
1596 }
1597 EXPORT_SYMBOL(drm_order);
1598
1599