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