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 int drm_map_handle(drm_device_t *dev, drm_hash_item_t *hash,
  69                    unsigned long user_token, int hashed_handle)
  70 {
  71         int use_hashed_handle;
  72         #if (BITS_PER_LONG == 64)
  73         use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
  74 #elif (BITS_PER_LONG == 32)
  75         use_hashed_handle = hashed_handle;
  76 #else
  77 #error Unsupported long size. Neither 64 nor 32 bits.
  78 #endif
  79
  80         if (use_hashed_handle) {
  81                 return drm_ht_just_insert_please(&dev->map_hash, hash,
  82                                                  user_token, 32 - PAGE_SHIFT - 3,
  83                                                  PAGE_SHIFT, DRM_MAP_HASH_OFFSET);
  84         } else {
  85                 hash->key = user_token;
  86                 return drm_ht_insert_item(&dev->map_hash, hash);
  87         }
  88 }
  89
  90 /**
  91  * Ioctl to specify a range of memory that is available for mapping by a non-root process.
  92  *
  93  * \param inode device inode.
  94  * \param filp file pointer.
  95  * \param cmd command.
  96  * \param arg pointer to a drm_map structure.
  97  * \return zero on success or a negative value on error.
  98  *
  99  * Adjusts the memory offset to its absolute value according to the mapping
 100  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
 101  * applicable and if supported by the kernel.
 102  */
 103 static int drm_addmap_core(drm_device_t * dev, unsigned int offset,
 104                            unsigned int size, drm_map_type_t type,
 105                            drm_map_flags_t flags, drm_map_list_t ** maplist)
 106 {
 107         drm_map_t *map;
 108         drm_map_list_t *list;
 109         drm_dma_handle_t *dmah;
 110         unsigned long user_token;
 111         int ret;
 112
 113         map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
 114         if (!map)
 115                 return -ENOMEM;
 116
 117         map->offset = offset;
 118         map->size = size;
 119         map->flags = flags;
 120         map->type = type;
 121
 122         /* Only allow shared memory to be removable since we only keep enough
 123          * book keeping information about shared memory to allow for removal
 124          * when processes fork.
 125          */
 126         if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
 127                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 128                 return -EINVAL;
 129         }
 130         DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
 131                   map->offset, map->size, map->type);
 132         if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
 133                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 134                 return -EINVAL;
 135         }
 136         map->mtrr = -1;
 137         map->handle = NULL;
 138
 139         switch (map->type) {
 140         case _DRM_REGISTERS:
 141         case _DRM_FRAME_BUFFER:
 142 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
 143                 if (map->offset + (map->size-1) < map->offset ||
 144                     map->offset < virt_to_phys(high_memory)) {
 145                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 146                         return -EINVAL;
 147                 }
 148 #endif
 149 #ifdef __alpha__
 150                 map->offset += dev->hose->mem_space->start;
 151 #endif
 152                 /* Some drivers preinitialize some maps, without the X Server
 153                  * needing to be aware of it.  Therefore, we just return success
 154                  * when the server tries to create a duplicate map.
 155                  */
 156                 list = drm_find_matching_map(dev, map);
 157                 if (list != NULL) {
 158                         if (list->map->size != map->size) {
 159                                 DRM_DEBUG("Matching maps of type %d with "
 160                                           "mismatched sizes, (%ld vs %ld)\n",
 161                                           map->type, map->size,
 162                                           list->map->size);
 163                                 list->map->size = map->size;
 164                         }
 165
 166                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 167                         *maplist = list;
 168                         return 0;
 169                 }
 170
 171                 if (drm_core_has_MTRR(dev)) {
 172                         if (map->type == _DRM_FRAME_BUFFER ||
 173                             (map->flags & _DRM_WRITE_COMBINING)) {
 174                                 map->mtrr = mtrr_add(map->offset, map->size,
 175                                                      MTRR_TYPE_WRCOMB, 1);
 176                         }
 177                 }
 178                 if (map->type == _DRM_REGISTERS)
 179                         map->handle = drm_ioremap(map->offset, map->size, dev);
 180                 break;
 181
 182         case _DRM_SHM:
 183                 map->handle = vmalloc_32(map->size);
 184                 DRM_DEBUG("%lu %d %p\n",
 185                           map->size, drm_order(map->size), map->handle);
 186                 if (!map->handle) {
 187                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 188                         return -ENOMEM;
 189                 }
 190                 map->offset = (unsigned long)map->handle;
 191                 if (map->flags & _DRM_CONTAINS_LOCK) {
 192                         /* Prevent a 2nd X Server from creating a 2nd lock */
 193                         if (dev->lock.hw_lock != NULL) {
 194                                 vfree(map->handle);
 195                                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 196                                 return -EBUSY;
 197                         }
 198                         dev->sigdata.lock = dev->lock.hw_lock = map->handle;    /* Pointer to lock */
 199                 }
 200                 break;
 201         case _DRM_AGP:
 202                 if (drm_core_has_AGP(dev)) {
 203 #ifdef __alpha__
 204                         map->offset += dev->hose->mem_space->start;
 205 #endif
 206                         map->offset += dev->agp->base;
 207                         map->mtrr = dev->agp->agp_mtrr; /* for getmap */
 208                 }
 209                 break;
 210         case _DRM_SCATTER_GATHER:
 211                 if (!dev->sg) {
 212                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 213                         return -EINVAL;
 214                 }
 215                 map->offset += (unsigned long)dev->sg->virtual;
 216                 break;
 217         case _DRM_CONSISTENT:
 218                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 219                  * As we're limiting the address to 2^32-1 (or less),
 220                  * casting it down to 32 bits is no problem, but we
 221                  * need to point to a 64bit variable first. */
 222                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 223                 if (!dmah) {
 224                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 225                         return -ENOMEM;
 226                 }
 227                 map->handle = dmah->vaddr;
 228                 map->offset = (unsigned long)dmah->busaddr;
 229                 kfree(dmah);
 230                 break;
 231         default:
 232                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 233                 return -EINVAL;
 234         }
 235
 236         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 237         if (!list) {
 238                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 239                 return -EINVAL;
 240         }
 241         memset(list, 0, sizeof(*list));
 242         list->map = map;
 243
 244         mutex_lock(&dev->struct_mutex);
 245         list_add(&list->head, &dev->maplist->head);
 246
 247         /* Assign a 32-bit handle */
 248         /* We do it here so that dev->struct_mutex protects the increment */
 249         user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
 250                 map->offset;
 251         ret = drm_map_handle(dev, &list->hash, user_token, FALSE);
 252         if (ret) {
 253                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 254                 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 255                 mutex_unlock(&dev->struct_mutex);
 256                 return ret;
 257         }
 258
 259         list->user_token = list->hash.key;
 260         mutex_unlock(&dev->struct_mutex);
 261
 262         *maplist = list;
 263         return 0;
 264 }
 265
 266 int drm_addmap(drm_device_t * dev, unsigned int offset,
 267                unsigned int size, drm_map_type_t type,
 268                drm_map_flags_t flags, drm_local_map_t ** map_ptr)
 269 {
 270         drm_map_list_t *list;
 271         int rc;
 272
 273         rc = drm_addmap_core(dev, offset, size, type, flags, &list);
 274         if (!rc)
 275                 *map_ptr = list->map;
 276         return rc;
 277 }
 278
 279 EXPORT_SYMBOL(drm_addmap);
 280
 281 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
 282                      unsigned int cmd, unsigned long arg)
 283 {
 284         drm_file_t *priv = filp->private_data;
 285         drm_device_t *dev = priv->head->dev;
 286         drm_map_t map;
 287         drm_map_list_t *maplist;
 288         drm_map_t __user *argp = (void __user *)arg;
 289         int err;
 290
 291         if (!(filp->f_mode & 3))
 292                 return -EACCES; /* Require read/write */
 293
 294         if (copy_from_user(&map, argp, sizeof(map))) {
 295                 return -EFAULT;
 296         }
 297
 298         if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
 299                 return -EPERM;
 300
 301         err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
 302                               &maplist);
 303
 304         if (err)
 305                 return err;
 306
 307         if (copy_to_user(argp, maplist->map, sizeof(drm_map_t)))
 308                 return -EFAULT;
 309
 310         /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
 311         if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
 312                 return -EFAULT;
 313         return 0;
 314 }
 315
 316 /**
 317  * Remove a map private from list and deallocate resources if the mapping
 318  * isn't in use.
 319  *
 320  * \param inode device inode.
 321  * \param filp file pointer.
 322  * \param cmd command.
 323  * \param arg pointer to a drm_map_t structure.
 324  * \return zero on success or a negative value on error.
 325  *
 326  * Searches the map on drm_device::maplist, removes it from the list, see if
 327  * its being used, and free any associate resource (such as MTRR's) if it's not
 328  * being on use.
 329  *
 330  * \sa drm_addmap
 331  */
 332 int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
 333 {
 334         struct list_head *list;
 335         drm_map_list_t *r_list = NULL;
 336         drm_dma_handle_t dmah;
 337
 338         /* Find the list entry for the map and remove it */
 339         list_for_each(list, &dev->maplist->head) {
 340                 r_list = list_entry(list, drm_map_list_t, head);
 341
 342                 if (r_list->map == map) {
 343                         list_del(list);
 344                         drm_ht_remove_key(&dev->map_hash, r_list->user_token);
 345                         drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 346                         break;
 347                 }
 348         }
 349
 350         /* List has wrapped around to the head pointer, or it's empty and we
 351          * didn't find anything.
 352          */
 353         if (list == (&dev->maplist->head)) {
 354                 return -EINVAL;
 355         }
 356
 357         switch (map->type) {
 358         case _DRM_REGISTERS:
 359                 drm_ioremapfree(map->handle, map->size, dev);
 360                 /* FALLTHROUGH */
 361         case _DRM_FRAME_BUFFER:
 362                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 363                         int retcode;
 364                         retcode = mtrr_del(map->mtrr, map->offset, map->size);
 365                         DRM_DEBUG("mtrr_del=%d\n", retcode);
 366                 }
 367                 break;
 368         case _DRM_SHM:
 369                 vfree(map->handle);
 370                 break;
 371         case _DRM_AGP:
 372         case _DRM_SCATTER_GATHER:
 373                 break;
 374         case _DRM_CONSISTENT:
 375                 dmah.vaddr = map->handle;
 376                 dmah.busaddr = map->offset;
 377                 dmah.size = map->size;
 378                 __drm_pci_free(dev, &dmah);
 379                 break;
 380         }
 381         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 382
 383         return 0;
 384 }
 385
 386 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
 387 {
 388         int ret;
 389
 390         mutex_lock(&dev->struct_mutex);
 391         ret = drm_rmmap_locked(dev, map);
 392         mutex_unlock(&dev->struct_mutex);
 393
 394         return ret;
 395 }
 396
 397 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 398  * the last close of the device, and this is necessary for cleanup when things
 399  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 400  * like a pointless exercise since they're going away anyway.
 401  *
 402  * One use case might be after addmap is allowed for normal users for SHM and
 403  * gets used by drivers that the server doesn't need to care about.  This seems
 404  * unlikely.
 405  */
 406 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 407                     unsigned int cmd, unsigned long arg)
 408 {
 409         drm_file_t *priv = filp->private_data;
 410         drm_device_t *dev = priv->head->dev;
 411         drm_map_t request;
 412         drm_local_map_t *map = NULL;
 413         struct list_head *list;
 414         int ret;
 415
 416         if (copy_from_user(&request, (drm_map_t __user *) arg, sizeof(request))) {
 417                 return -EFAULT;
 418         }
 419
 420         mutex_lock(&dev->struct_mutex);
 421         list_for_each(list, &dev->maplist->head) {
 422                 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 423
 424                 if (r_list->map &&
 425                     r_list->user_token == (unsigned long)request.handle &&
 426                     r_list->map->flags & _DRM_REMOVABLE) {
 427                         map = r_list->map;
 428                         break;
 429                 }
 430         }
 431
 432         /* List has wrapped around to the head pointer, or its empty we didn't
 433          * find anything.
 434          */
 435         if (list == (&dev->maplist->head)) {
 436                 mutex_unlock(&dev->struct_mutex);
 437                 return -EINVAL;
 438         }
 439
 440         if (!map) {
 441                 mutex_unlock(&dev->struct_mutex);
 442                 return -EINVAL;
 443         }
 444
 445         /* Register and framebuffer maps are permanent */
 446         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 447                 mutex_unlock(&dev->struct_mutex);
 448                 return 0;
 449         }
 450
 451         ret = drm_rmmap_locked(dev, map);
 452
 453         mutex_unlock(&dev->struct_mutex);
 454
 455         return ret;
 456 }
 457
 458 /**
 459  * Cleanup after an error on one of the addbufs() functions.
 460  *
 461  * \param dev DRM device.
 462  * \param entry buffer entry where the error occurred.
 463  *
 464  * Frees any pages and buffers associated with the given entry.
 465  */
 466 static void drm_cleanup_buf_error(drm_device_t * dev, drm_buf_entry_t * entry)
 467 {
 468         int i;
 469
 470         if (entry->seg_count) {
 471                 for (i = 0; i < entry->seg_count; i++) {
 472                         if (entry->seglist[i]) {
 473                                 drm_pci_free(dev, entry->seglist[i]);
 474                         }
 475                 }
 476                 drm_free(entry->seglist,
 477                          entry->seg_count *
 478                          sizeof(*entry->seglist), DRM_MEM_SEGS);
 479
 480                 entry->seg_count = 0;
 481         }
 482
 483         if (entry->buf_count) {
 484                 for (i = 0; i < entry->buf_count; i++) {
 485                         if (entry->buflist[i].dev_private) {
 486                                 drm_free(entry->buflist[i].dev_private,
 487                                          entry->buflist[i].dev_priv_size,
 488                                          DRM_MEM_BUFS);
 489                         }
 490                 }
 491                 drm_free(entry->buflist,
 492                          entry->buf_count *
 493                          sizeof(*entry->buflist), DRM_MEM_BUFS);
 494
 495                 entry->buf_count = 0;
 496         }
 497 }
 498
 499 #if __OS_HAS_AGP
 500 /**
 501  * Add AGP buffers for DMA transfers.
 502  *
 503  * \param dev drm_device_t to which the buffers are to be added.
 504  * \param request pointer to a drm_buf_desc_t describing the request.
 505  * \return zero on success or a negative number on failure.
 506  *
 507  * After some sanity checks creates a drm_buf structure for each buffer and
 508  * reallocates the buffer list of the same size order to accommodate the new
 509  * buffers.
 510  */
 511 int drm_addbufs_agp(drm_device_t * dev, drm_buf_desc_t * request)
 512 {
 513         drm_device_dma_t *dma = dev->dma;
 514         drm_buf_entry_t *entry;
 515         drm_buf_t *buf;
 516         unsigned long offset;
 517         unsigned long agp_offset;
 518         int count;
 519         int order;
 520         int size;
 521         int alignment;
 522         int page_order;
 523         int total;
 524         int byte_count;
 525         int i;
 526         drm_buf_t **temp_buflist;
 527
 528         if (!dma)
 529                 return -EINVAL;
 530
 531         count = request->count;
 532         order = drm_order(request->size);
 533         size = 1 << order;
 534
 535         alignment = (request->flags & _DRM_PAGE_ALIGN)
 536             ? PAGE_ALIGN(size) : size;
 537         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 538         total = PAGE_SIZE << page_order;
 539
 540         byte_count = 0;
 541         agp_offset = dev->agp->base + request->agp_start;
 542
 543         DRM_DEBUG("count:      %d\n", count);
 544         DRM_DEBUG("order:      %d\n", order);
 545         DRM_DEBUG("size:       %d\n", size);
 546         DRM_DEBUG("agp_offset: %lx\n", agp_offset);
 547         DRM_DEBUG("alignment:  %d\n", alignment);
 548         DRM_DEBUG("page_order: %d\n", page_order);
 549         DRM_DEBUG("total:      %d\n", total);
 550
 551         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 552                 return -EINVAL;
 553         if (dev->queue_count)
 554                 return -EBUSY;  /* Not while in use */
 555
 556         spin_lock(&dev->count_lock);
 557         if (dev->buf_use) {
 558                 spin_unlock(&dev->count_lock);
 559                 return -EBUSY;
 560         }
 561         atomic_inc(&dev->buf_alloc);
 562         spin_unlock(&dev->count_lock);
 563
 564         mutex_lock(&dev->struct_mutex);
 565         entry = &dma->bufs[order];
 566         if (entry->buf_count) {
 567                 mutex_unlock(&dev->struct_mutex);
 568                 atomic_dec(&dev->buf_alloc);
 569                 return -ENOMEM; /* May only call once for each order */
 570         }
 571
 572         if (count < 0 || count > 4096) {
 573                 mutex_unlock(&dev->struct_mutex);
 574                 atomic_dec(&dev->buf_alloc);
 575                 return -EINVAL;
 576         }
 577
 578         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 579                                    DRM_MEM_BUFS);
 580         if (!entry->buflist) {
 581                 mutex_unlock(&dev->struct_mutex);
 582                 atomic_dec(&dev->buf_alloc);
 583                 return -ENOMEM;
 584         }
 585         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 586
 587         entry->buf_size = size;
 588         entry->page_order = page_order;
 589
 590         offset = 0;
 591
 592         while (entry->buf_count < count) {
 593                 buf = &entry->buflist[entry->buf_count];
 594                 buf->idx = dma->buf_count + entry->buf_count;
 595                 buf->total = alignment;
 596                 buf->order = order;
 597                 buf->used = 0;
 598
 599                 buf->offset = (dma->byte_count + offset);
 600                 buf->bus_address = agp_offset + offset;
 601                 buf->address = (void *)(agp_offset + offset);
 602                 buf->next = NULL;
 603                 buf->waiting = 0;
 604                 buf->pending = 0;
 605                 init_waitqueue_head(&buf->dma_wait);
 606                 buf->filp = NULL;
 607
 608                 buf->dev_priv_size = dev->driver->dev_priv_size;
 609                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 610                 if (!buf->dev_private) {
 611                         /* Set count correctly so we free the proper amount. */
 612                         entry->buf_count = count;
 613                         drm_cleanup_buf_error(dev, entry);
 614                         mutex_unlock(&dev->struct_mutex);
 615                         atomic_dec(&dev->buf_alloc);
 616                         return -ENOMEM;
 617                 }
 618                 memset(buf->dev_private, 0, buf->dev_priv_size);
 619
 620                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
 621
 622                 offset += alignment;
 623                 entry->buf_count++;
 624                 byte_count += PAGE_SIZE << page_order;
 625         }
 626
 627         DRM_DEBUG("byte_count: %d\n", byte_count);
 628
 629         temp_buflist = drm_realloc(dma->buflist,
 630                                    dma->buf_count * sizeof(*dma->buflist),
 631                                    (dma->buf_count + entry->buf_count)
 632                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 633         if (!temp_buflist) {
 634                 /* Free the entry because it isn't valid */
 635                 drm_cleanup_buf_error(dev, entry);
 636                 mutex_unlock(&dev->struct_mutex);
 637                 atomic_dec(&dev->buf_alloc);
 638                 return -ENOMEM;
 639         }
 640         dma->buflist = temp_buflist;
 641
 642         for (i = 0; i < entry->buf_count; i++) {
 643                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 644         }
 645
 646         dma->buf_count += entry->buf_count;
 647         dma->seg_count += entry->seg_count;
 648         dma->page_count += byte_count >> PAGE_SHIFT;
 649         dma->byte_count += byte_count;
 650
 651         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
 652         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
 653
 654         mutex_unlock(&dev->struct_mutex);
 655
 656         request->count = entry->buf_count;
 657         request->size = size;
 658
 659         dma->flags = _DRM_DMA_USE_AGP;
 660
 661         atomic_dec(&dev->buf_alloc);
 662         return 0;
 663 }
 664 EXPORT_SYMBOL(drm_addbufs_agp);
 665 #endif                          /* __OS_HAS_AGP */
 666
 667 int drm_addbufs_pci(drm_device_t * dev, drm_buf_desc_t * request)
 668 {
 669         drm_device_dma_t *dma = dev->dma;
 670         int count;
 671         int order;
 672         int size;
 673         int total;
 674         int page_order;
 675         drm_buf_entry_t *entry;
 676         drm_dma_handle_t *dmah;
 677         drm_buf_t *buf;
 678         int alignment;
 679         unsigned long offset;
 680         int i;
 681         int byte_count;
 682         int page_count;
 683         unsigned long *temp_pagelist;
 684         drm_buf_t **temp_buflist;
 685
 686         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
 687                 return -EINVAL;
 688
 689         if (!dma)
 690                 return -EINVAL;
 691
 692         if (!capable(CAP_SYS_ADMIN))
 693                 return -EPERM;
 694
 695         count = request->count;
 696         order = drm_order(request->size);
 697         size = 1 << order;
 698
 699         DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 700                   request->count, request->size, size, order, dev->queue_count);
 701
 702         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 703                 return -EINVAL;
 704         if (dev->queue_count)
 705                 return -EBUSY;  /* Not while in use */
 706
 707         alignment = (request->flags & _DRM_PAGE_ALIGN)
 708             ? PAGE_ALIGN(size) : size;
 709         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 710         total = PAGE_SIZE << page_order;
 711
 712         spin_lock(&dev->count_lock);
 713         if (dev->buf_use) {
 714                 spin_unlock(&dev->count_lock);
 715                 return -EBUSY;
 716         }
 717         atomic_inc(&dev->buf_alloc);
 718         spin_unlock(&dev->count_lock);
 719
 720         mutex_lock(&dev->struct_mutex);
 721         entry = &dma->bufs[order];
 722         if (entry->buf_count) {
 723                 mutex_unlock(&dev->struct_mutex);
 724                 atomic_dec(&dev->buf_alloc);
 725                 return -ENOMEM; /* May only call once for each order */
 726         }
 727
 728         if (count < 0 || count > 4096) {
 729                 mutex_unlock(&dev->struct_mutex);
 730                 atomic_dec(&dev->buf_alloc);
 731                 return -EINVAL;
 732         }
 733
 734         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 735                                    DRM_MEM_BUFS);
 736         if (!entry->buflist) {
 737                 mutex_unlock(&dev->struct_mutex);
 738                 atomic_dec(&dev->buf_alloc);
 739                 return -ENOMEM;
 740         }
 741         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 742
 743         entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
 744                                    DRM_MEM_SEGS);
 745         if (!entry->seglist) {
 746                 drm_free(entry->buflist,
 747                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 748                 mutex_unlock(&dev->struct_mutex);
 749                 atomic_dec(&dev->buf_alloc);
 750                 return -ENOMEM;
 751         }
 752         memset(entry->seglist, 0, count * sizeof(*entry->seglist));
 753
 754         /* Keep the original pagelist until we know all the allocations
 755          * have succeeded
 756          */
 757         temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
 758                                   * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 759         if (!temp_pagelist) {
 760                 drm_free(entry->buflist,
 761                          count * sizeof(*entry->buflist), DRM_MEM_BUFS);
 762                 drm_free(entry->seglist,
 763                          count * sizeof(*entry->seglist), DRM_MEM_SEGS);
 764                 mutex_unlock(&dev->struct_mutex);
 765                 atomic_dec(&dev->buf_alloc);
 766                 return -ENOMEM;
 767         }
 768         memcpy(temp_pagelist,
 769                dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
 770         DRM_DEBUG("pagelist: %d entries\n",
 771                   dma->page_count + (count << page_order));
 772
 773         entry->buf_size = size;
 774         entry->page_order = page_order;
 775         byte_count = 0;
 776         page_count = 0;
 777
 778         while (entry->buf_count < count) {
 779
 780                 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
 781
 782                 if (!dmah) {
 783                         /* Set count correctly so we free the proper amount. */
 784                         entry->buf_count = count;
 785                         entry->seg_count = count;
 786                         drm_cleanup_buf_error(dev, entry);
 787                         drm_free(temp_pagelist,
 788                                  (dma->page_count + (count << page_order))
 789                                  * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 790                         mutex_unlock(&dev->struct_mutex);
 791                         atomic_dec(&dev->buf_alloc);
 792                         return -ENOMEM;
 793                 }
 794                 entry->seglist[entry->seg_count++] = dmah;
 795                 for (i = 0; i < (1 << page_order); i++) {
 796                         DRM_DEBUG("page %d @ 0x%08lx\n",
 797                                   dma->page_count + page_count,
 798                                   (unsigned long)dmah->vaddr + PAGE_SIZE * i);
 799                         temp_pagelist[dma->page_count + page_count++]
 800                                 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
 801                 }
 802                 for (offset = 0;
 803                      offset + size <= total && entry->buf_count < count;
 804                      offset += alignment, ++entry->buf_count) {
 805                         buf = &entry->buflist[entry->buf_count];
 806                         buf->idx = dma->buf_count + entry->buf_count;
 807                         buf->total = alignment;
 808                         buf->order = order;
 809                         buf->used = 0;
 810                         buf->offset = (dma->byte_count + byte_count + offset);
 811                         buf->address = (void *)(dmah->vaddr + offset);
 812                         buf->bus_address = dmah->busaddr + offset;
 813                         buf->next = NULL;
 814                         buf->waiting = 0;
 815                         buf->pending = 0;
 816                         init_waitqueue_head(&buf->dma_wait);
 817                         buf->filp = NULL;
 818
 819                         buf->dev_priv_size = dev->driver->dev_priv_size;
 820                         buf->dev_private = drm_alloc(buf->dev_priv_size,
 821                                                      DRM_MEM_BUFS);
 822                         if (!buf->dev_private) {
 823                                 /* Set count correctly so we free the proper amount. */
 824                                 entry->buf_count = count;
 825                                 entry->seg_count = count;
 826                                 drm_cleanup_buf_error(dev, entry);
 827                                 drm_free(temp_pagelist,
 828                                          (dma->page_count +
 829                                           (count << page_order))
 830                                          * sizeof(*dma->pagelist),
 831                                          DRM_MEM_PAGES);
 832                                 mutex_unlock(&dev->struct_mutex);
 833                                 atomic_dec(&dev->buf_alloc);
 834                                 return -ENOMEM;
 835                         }
 836                         memset(buf->dev_private, 0, buf->dev_priv_size);
 837
 838                         DRM_DEBUG("buffer %d @ %p\n",
 839                                   entry->buf_count, buf->address);
 840                 }
 841                 byte_count += PAGE_SIZE << page_order;
 842         }
 843
 844         temp_buflist = drm_realloc(dma->buflist,
 845                                    dma->buf_count * sizeof(*dma->buflist),
 846                                    (dma->buf_count + entry->buf_count)
 847                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
 848         if (!temp_buflist) {
 849                 /* Free the entry because it isn't valid */
 850                 drm_cleanup_buf_error(dev, entry);
 851                 drm_free(temp_pagelist,
 852                          (dma->page_count + (count << page_order))
 853                          * sizeof(*dma->pagelist), DRM_MEM_PAGES);
 854                 mutex_unlock(&dev->struct_mutex);
 855                 atomic_dec(&dev->buf_alloc);
 856                 return -ENOMEM;
 857         }
 858         dma->buflist = temp_buflist;
 859
 860         for (i = 0; i < entry->buf_count; i++) {
 861                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 862         }
 863
 864         /* No allocations failed, so now we can replace the orginal pagelist
 865          * with the new one.
 866          */
 867         if (dma->page_count) {
 868                 drm_free(dma->pagelist,
 869                          dma->page_count * sizeof(*dma->pagelist),
 870                          DRM_MEM_PAGES);
 871         }
 872         dma->pagelist = temp_pagelist;
 873
 874         dma->buf_count += entry->buf_count;
 875         dma->seg_count += entry->seg_count;
 876         dma->page_count += entry->seg_count << page_order;
 877         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 878
 879         mutex_unlock(&dev->struct_mutex);
 880
 881         request->count = entry->buf_count;
 882         request->size = size;
 883
 884         atomic_dec(&dev->buf_alloc);
 885         return 0;
 886
 887 }
 888 EXPORT_SYMBOL(drm_addbufs_pci);
 889
 890 static int drm_addbufs_sg(drm_device_t * dev, drm_buf_desc_t * request)
 891 {
 892         drm_device_dma_t *dma = dev->dma;
 893         drm_buf_entry_t *entry;
 894         drm_buf_t *buf;
 895         unsigned long offset;
 896         unsigned long agp_offset;
 897         int count;
 898         int order;
 899         int size;
 900         int alignment;
 901         int page_order;
 902         int total;
 903         int byte_count;
 904         int i;
 905         drm_buf_t **temp_buflist;
 906
 907         if (!drm_core_check_feature(dev, DRIVER_SG))
 908                 return -EINVAL;
 909
 910         if (!dma)
 911                 return -EINVAL;
 912
 913         if (!capable(CAP_SYS_ADMIN))
 914                 return -EPERM;
 915
 916         count = request->count;
 917         order = drm_order(request->size);
 918         size = 1 << order;
 919
 920         alignment = (request->flags & _DRM_PAGE_ALIGN)
 921             ? PAGE_ALIGN(size) : size;
 922         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 923         total = PAGE_SIZE << page_order;
 924
 925         byte_count = 0;
 926         agp_offset = request->agp_start;
 927
 928         DRM_DEBUG("count:      %d\n", count);
 929         DRM_DEBUG("order:      %d\n", order);
 930         DRM_DEBUG("size:       %d\n", size);
 931         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
 932         DRM_DEBUG("alignment:  %d\n", alignment);
 933         DRM_DEBUG("page_order: %d\n", page_order);
 934         DRM_DEBUG("total:      %d\n", total);
 935
 936         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
 937                 return -EINVAL;
 938         if (dev->queue_count)
 939                 return -EBUSY;  /* Not while in use */
 940
 941         spin_lock(&dev->count_lock);
 942         if (dev->buf_use) {
 943                 spin_unlock(&dev->count_lock);
 944                 return -EBUSY;
 945         }
 946         atomic_inc(&dev->buf_alloc);
 947         spin_unlock(&dev->count_lock);
 948
 949         mutex_lock(&dev->struct_mutex);
 950         entry = &dma->bufs[order];
 951         if (entry->buf_count) {
 952                 mutex_unlock(&dev->struct_mutex);
 953                 atomic_dec(&dev->buf_alloc);
 954                 return -ENOMEM; /* May only call once for each order */
 955         }
 956
 957         if (count < 0 || count > 4096) {
 958                 mutex_unlock(&dev->struct_mutex);
 959                 atomic_dec(&dev->buf_alloc);
 960                 return -EINVAL;
 961         }
 962
 963         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
 964                                    DRM_MEM_BUFS);
 965         if (!entry->buflist) {
 966                 mutex_unlock(&dev->struct_mutex);
 967                 atomic_dec(&dev->buf_alloc);
 968                 return -ENOMEM;
 969         }
 970         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
 971
 972         entry->buf_size = size;
 973         entry->page_order = page_order;
 974
 975         offset = 0;
 976
 977         while (entry->buf_count < count) {
 978                 buf = &entry->buflist[entry->buf_count];
 979                 buf->idx = dma->buf_count + entry->buf_count;
 980                 buf->total = alignment;
 981                 buf->order = order;
 982                 buf->used = 0;
 983
 984                 buf->offset = (dma->byte_count + offset);
 985                 buf->bus_address = agp_offset + offset;
 986                 buf->address = (void *)(agp_offset + offset
 987                                         + (unsigned long)dev->sg->virtual);
 988                 buf->next = NULL;
 989                 buf->waiting = 0;
 990                 buf->pending = 0;
 991                 init_waitqueue_head(&buf->dma_wait);
 992                 buf->filp = NULL;
 993
 994                 buf->dev_priv_size = dev->driver->dev_priv_size;
 995                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
 996                 if (!buf->dev_private) {
 997                         /* Set count correctly so we free the proper amount. */
 998                         entry->buf_count = count;
 999                         drm_cleanup_buf_error(dev, entry);
1000                         mutex_unlock(&dev->struct_mutex);
1001                         atomic_dec(&dev->buf_alloc);
1002                         return -ENOMEM;
1003                 }
1004
1005                 memset(buf->dev_private, 0, buf->dev_priv_size);
1006
1007                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1008
1009                 offset += alignment;
1010                 entry->buf_count++;
1011                 byte_count += PAGE_SIZE << page_order;
1012         }
1013
1014         DRM_DEBUG("byte_count: %d\n", byte_count);
1015
1016         temp_buflist = drm_realloc(dma->buflist,
1017                                    dma->buf_count * sizeof(*dma->buflist),
1018                                    (dma->buf_count + entry->buf_count)
1019                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1020         if (!temp_buflist) {
1021                 /* Free the entry because it isn't valid */
1022                 drm_cleanup_buf_error(dev, entry);
1023                 mutex_unlock(&dev->struct_mutex);
1024                 atomic_dec(&dev->buf_alloc);
1025                 return -ENOMEM;
1026         }
1027         dma->buflist = temp_buflist;
1028
1029         for (i = 0; i < entry->buf_count; i++) {
1030                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1031         }
1032
1033         dma->buf_count += entry->buf_count;
1034         dma->seg_count += entry->seg_count;
1035         dma->page_count += byte_count >> PAGE_SHIFT;
1036         dma->byte_count += byte_count;
1037
1038         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1039         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1040
1041         mutex_unlock(&dev->struct_mutex);
1042
1043         request->count = entry->buf_count;
1044         request->size = size;
1045
1046         dma->flags = _DRM_DMA_USE_SG;
1047
1048         atomic_dec(&dev->buf_alloc);
1049         return 0;
1050 }
1051
1052 static int drm_addbufs_fb(drm_device_t * dev, drm_buf_desc_t * request)
1053 {
1054         drm_device_dma_t *dma = dev->dma;
1055         drm_buf_entry_t *entry;
1056         drm_buf_t *buf;
1057         unsigned long offset;
1058         unsigned long agp_offset;
1059         int count;
1060         int order;
1061         int size;
1062         int alignment;
1063         int page_order;
1064         int total;
1065         int byte_count;
1066         int i;
1067         drm_buf_t **temp_buflist;
1068
1069         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1070                 return -EINVAL;
1071
1072         if (!dma)
1073                 return -EINVAL;
1074
1075         if (!capable(CAP_SYS_ADMIN))
1076                 return -EPERM;
1077
1078         count = request->count;
1079         order = drm_order(request->size);
1080         size = 1 << order;
1081
1082         alignment = (request->flags & _DRM_PAGE_ALIGN)
1083             ? PAGE_ALIGN(size) : size;
1084         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1085         total = PAGE_SIZE << page_order;
1086
1087         byte_count = 0;
1088         agp_offset = request->agp_start;
1089
1090         DRM_DEBUG("count:      %d\n", count);
1091         DRM_DEBUG("order:      %d\n", order);
1092         DRM_DEBUG("size:       %d\n", size);
1093         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1094         DRM_DEBUG("alignment:  %d\n", alignment);
1095         DRM_DEBUG("page_order: %d\n", page_order);
1096         DRM_DEBUG("total:      %d\n", total);
1097
1098         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1099                 return -EINVAL;
1100         if (dev->queue_count)
1101                 return -EBUSY;  /* Not while in use */
1102
1103         spin_lock(&dev->count_lock);
1104         if (dev->buf_use) {
1105                 spin_unlock(&dev->count_lock);
1106                 return -EBUSY;
1107         }
1108         atomic_inc(&dev->buf_alloc);
1109         spin_unlock(&dev->count_lock);
1110
1111         mutex_lock(&dev->struct_mutex);
1112         entry = &dma->bufs[order];
1113         if (entry->buf_count) {
1114                 mutex_unlock(&dev->struct_mutex);
1115                 atomic_dec(&dev->buf_alloc);
1116                 return -ENOMEM; /* May only call once for each order */
1117         }
1118
1119         if (count < 0 || count > 4096) {
1120                 mutex_unlock(&dev->struct_mutex);
1121                 atomic_dec(&dev->buf_alloc);
1122                 return -EINVAL;
1123         }
1124
1125         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1126                                    DRM_MEM_BUFS);
1127         if (!entry->buflist) {
1128                 mutex_unlock(&dev->struct_mutex);
1129                 atomic_dec(&dev->buf_alloc);
1130                 return -ENOMEM;
1131         }
1132         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1133
1134         entry->buf_size = size;
1135         entry->page_order = page_order;
1136
1137         offset = 0;
1138
1139         while (entry->buf_count < count) {
1140                 buf = &entry->buflist[entry->buf_count];
1141                 buf->idx = dma->buf_count + entry->buf_count;
1142                 buf->total = alignment;
1143                 buf->order = order;
1144                 buf->used = 0;
1145
1146                 buf->offset = (dma->byte_count + offset);
1147                 buf->bus_address = agp_offset + offset;
1148                 buf->address = (void *)(agp_offset + offset);
1149                 buf->next = NULL;
1150                 buf->waiting = 0;
1151                 buf->pending = 0;
1152                 init_waitqueue_head(&buf->dma_wait);
1153                 buf->filp = NULL;
1154
1155                 buf->dev_priv_size = dev->driver->dev_priv_size;
1156                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1157                 if (!buf->dev_private) {
1158                         /* Set count correctly so we free the proper amount. */
1159                         entry->buf_count = count;
1160                         drm_cleanup_buf_error(dev, entry);
1161                         mutex_unlock(&dev->struct_mutex);
1162                         atomic_dec(&dev->buf_alloc);
1163                         return -ENOMEM;
1164                 }
1165                 memset(buf->dev_private, 0, buf->dev_priv_size);
1166
1167                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1168
1169                 offset += alignment;
1170                 entry->buf_count++;
1171                 byte_count += PAGE_SIZE << page_order;
1172         }
1173
1174         DRM_DEBUG("byte_count: %d\n", byte_count);
1175
1176         temp_buflist = drm_realloc(dma->buflist,
1177                                    dma->buf_count * sizeof(*dma->buflist),
1178                                    (dma->buf_count + entry->buf_count)
1179                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1180         if (!temp_buflist) {
1181                 /* Free the entry because it isn't valid */
1182                 drm_cleanup_buf_error(dev, entry);
1183                 mutex_unlock(&dev->struct_mutex);
1184                 atomic_dec(&dev->buf_alloc);
1185                 return -ENOMEM;
1186         }
1187         dma->buflist = temp_buflist;
1188
1189         for (i = 0; i < entry->buf_count; i++) {
1190                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1191         }
1192
1193         dma->buf_count += entry->buf_count;
1194         dma->seg_count += entry->seg_count;
1195         dma->page_count += byte_count >> PAGE_SHIFT;
1196         dma->byte_count += byte_count;
1197
1198         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1199         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1200
1201         mutex_unlock(&dev->struct_mutex);
1202
1203         request->count = entry->buf_count;
1204         request->size = size;
1205
1206         dma->flags = _DRM_DMA_USE_FB;
1207
1208         atomic_dec(&dev->buf_alloc);
1209         return 0;
1210 }
1211
1212
1213 /**
1214  * Add buffers for DMA transfers (ioctl).
1215  *
1216  * \param inode device inode.
1217  * \param filp file pointer.
1218  * \param cmd command.
1219  * \param arg pointer to a drm_buf_desc_t request.
1220  * \return zero on success or a negative number on failure.
1221  *
1222  * According with the memory type specified in drm_buf_desc::flags and the
1223  * build options, it dispatches the call either to addbufs_agp(),
1224  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1225  * PCI memory respectively.
1226  */
1227 int drm_addbufs(struct inode *inode, struct file *filp,
1228                 unsigned int cmd, unsigned long arg)
1229 {
1230         drm_buf_desc_t request;
1231         drm_file_t *priv = filp->private_data;
1232         drm_device_t *dev = priv->head->dev;
1233         int ret;
1234
1235         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1236                 return -EINVAL;
1237
1238         if (copy_from_user(&request, (drm_buf_desc_t __user *) arg,
1239                            sizeof(request)))
1240                 return -EFAULT;
1241
1242 #if __OS_HAS_AGP
1243         if (request.flags & _DRM_AGP_BUFFER)
1244                 ret = drm_addbufs_agp(dev, &request);
1245         else
1246 #endif
1247         if (request.flags & _DRM_SG_BUFFER)
1248                 ret = drm_addbufs_sg(dev, &request);
1249         else if (request.flags & _DRM_FB_BUFFER)
1250                 ret = drm_addbufs_fb(dev, &request);
1251         else
1252                 ret = drm_addbufs_pci(dev, &request);
1253
1254         if (ret == 0) {
1255                 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1256                         ret = -EFAULT;
1257                 }
1258         }
1259         return ret;
1260 }
1261
1262 /**
1263  * Get information about the buffer mappings.
1264  *
1265  * This was originally mean for debugging purposes, or by a sophisticated
1266  * client library to determine how best to use the available buffers (e.g.,
1267  * large buffers can be used for image transfer).
1268  *
1269  * \param inode device inode.
1270  * \param filp file pointer.
1271  * \param cmd command.
1272  * \param arg pointer to a drm_buf_info structure.
1273  * \return zero on success or a negative number on failure.
1274  *
1275  * Increments drm_device::buf_use while holding the drm_device::count_lock
1276  * lock, preventing of allocating more buffers after this call. Information
1277  * about each requested buffer is then copied into user space.
1278  */
1279 int drm_infobufs(struct inode *inode, struct file *filp,
1280                  unsigned int cmd, unsigned long arg)
1281 {
1282         drm_file_t *priv = filp->private_data;
1283         drm_device_t *dev = priv->head->dev;
1284         drm_device_dma_t *dma = dev->dma;
1285         drm_buf_info_t request;
1286         drm_buf_info_t __user *argp = (void __user *)arg;
1287         int i;
1288         int count;
1289
1290         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1291                 return -EINVAL;
1292
1293         if (!dma)
1294                 return -EINVAL;
1295
1296         spin_lock(&dev->count_lock);
1297         if (atomic_read(&dev->buf_alloc)) {
1298                 spin_unlock(&dev->count_lock);
1299                 return -EBUSY;
1300         }
1301         ++dev->buf_use;         /* Can't allocate more after this call */
1302         spin_unlock(&dev->count_lock);
1303
1304         if (copy_from_user(&request, argp, sizeof(request)))
1305                 return -EFAULT;
1306
1307         for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1308                 if (dma->bufs[i].buf_count)
1309                         ++count;
1310         }
1311
1312         DRM_DEBUG("count = %d\n", count);
1313
1314         if (request.count >= count) {
1315                 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1316                         if (dma->bufs[i].buf_count) {
1317                                 drm_buf_desc_t __user *to =
1318                                     &request.list[count];
1319                                 drm_buf_entry_t *from = &dma->bufs[i];
1320                                 drm_freelist_t *list = &dma->bufs[i].freelist;
1321                                 if (copy_to_user(&to->count,
1322                                                  &from->buf_count,
1323                                                  sizeof(from->buf_count)) ||
1324                                     copy_to_user(&to->size,
1325                                                  &from->buf_size,
1326                                                  sizeof(from->buf_size)) ||
1327                                     copy_to_user(&to->low_mark,
1328                                                  &list->low_mark,
1329                                                  sizeof(list->low_mark)) ||
1330                                     copy_to_user(&to->high_mark,
1331                                                  &list->high_mark,
1332                                                  sizeof(list->high_mark)))
1333                                         return -EFAULT;
1334
1335                                 DRM_DEBUG("%d %d %d %d %d\n",
1336                                           i,
1337                                           dma->bufs[i].buf_count,
1338                                           dma->bufs[i].buf_size,
1339                                           dma->bufs[i].freelist.low_mark,
1340                                           dma->bufs[i].freelist.high_mark);
1341                                 ++count;
1342                         }
1343                 }
1344         }
1345         request.count = count;
1346
1347         if (copy_to_user(argp, &request, sizeof(request)))
1348                 return -EFAULT;
1349
1350         return 0;
1351 }
1352
1353 /**
1354  * Specifies a low and high water mark for buffer allocation
1355  *
1356  * \param inode device inode.
1357  * \param filp file pointer.
1358  * \param cmd command.
1359  * \param arg a pointer to a drm_buf_desc structure.
1360  * \return zero on success or a negative number on failure.
1361  *
1362  * Verifies that the size order is bounded between the admissible orders and
1363  * updates the respective drm_device_dma::bufs entry low and high water mark.
1364  *
1365  * \note This ioctl is deprecated and mostly never used.
1366  */
1367 int drm_markbufs(struct inode *inode, struct file *filp,
1368                  unsigned int cmd, unsigned long arg)
1369 {
1370         drm_file_t *priv = filp->private_data;
1371         drm_device_t *dev = priv->head->dev;
1372         drm_device_dma_t *dma = dev->dma;
1373         drm_buf_desc_t request;
1374         int order;
1375         drm_buf_entry_t *entry;
1376
1377         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1378                 return -EINVAL;
1379
1380         if (!dma)
1381                 return -EINVAL;
1382
1383         if (copy_from_user(&request,
1384                            (drm_buf_desc_t __user *) arg, sizeof(request)))
1385                 return -EFAULT;
1386
1387         DRM_DEBUG("%d, %d, %d\n",
1388                   request.size, request.low_mark, request.high_mark);
1389         order = drm_order(request.size);
1390         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1391                 return -EINVAL;
1392         entry = &dma->bufs[order];
1393
1394         if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1395                 return -EINVAL;
1396         if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1397                 return -EINVAL;
1398
1399         entry->freelist.low_mark = request.low_mark;
1400         entry->freelist.high_mark = request.high_mark;
1401
1402         return 0;
1403 }
1404
1405 /**
1406  * Unreserve the buffers in list, previously reserved using drmDMA.
1407  *
1408  * \param inode device inode.
1409  * \param filp file pointer.
1410  * \param cmd command.
1411  * \param arg pointer to a drm_buf_free structure.
1412  * \return zero on success or a negative number on failure.
1413  *
1414  * Calls free_buffer() for each used buffer.
1415  * This function is primarily used for debugging.
1416  */
1417 int drm_freebufs(struct inode *inode, struct file *filp,
1418                  unsigned int cmd, unsigned long arg)
1419 {
1420         drm_file_t *priv = filp->private_data;
1421         drm_device_t *dev = priv->head->dev;
1422         drm_device_dma_t *dma = dev->dma;
1423         drm_buf_free_t request;
1424         int i;
1425         int idx;
1426         drm_buf_t *buf;
1427
1428         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1429                 return -EINVAL;
1430
1431         if (!dma)
1432                 return -EINVAL;
1433
1434         if (copy_from_user(&request,
1435                            (drm_buf_free_t __user *) arg, sizeof(request)))
1436                 return -EFAULT;
1437
1438         DRM_DEBUG("%d\n", request.count);
1439         for (i = 0; i < request.count; i++) {
1440                 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1441                         return -EFAULT;
1442                 if (idx < 0 || idx >= dma->buf_count) {
1443                         DRM_ERROR("Index %d (of %d max)\n",
1444                                   idx, dma->buf_count - 1);
1445                         return -EINVAL;
1446                 }
1447                 buf = dma->buflist[idx];
1448                 if (buf->filp != filp) {
1449                         DRM_ERROR("Process %d freeing buffer not owned\n",
1450                                   current->pid);
1451                         return -EINVAL;
1452                 }
1453                 drm_free_buffer(dev, buf);
1454         }
1455
1456         return 0;
1457 }
1458
1459 /**
1460  * Maps all of the DMA buffers into client-virtual space (ioctl).
1461  *
1462  * \param inode device inode.
1463  * \param filp file pointer.
1464  * \param cmd command.
1465  * \param arg pointer to a drm_buf_map structure.
1466  * \return zero on success or a negative number on failure.
1467  *
1468  * Maps the AGP or SG buffer region with do_mmap(), and copies information
1469  * about each buffer into user space. The PCI buffers are already mapped on the
1470  * addbufs_pci() call.
1471  */
1472 int drm_mapbufs(struct inode *inode, struct file *filp,
1473                 unsigned int cmd, unsigned long arg)
1474 {
1475         drm_file_t *priv = filp->private_data;
1476         drm_device_t *dev = priv->head->dev;
1477         drm_device_dma_t *dma = dev->dma;
1478         drm_buf_map_t __user *argp = (void __user *)arg;
1479         int retcode = 0;
1480         const int zero = 0;
1481         unsigned long virtual;
1482         unsigned long address;
1483         drm_buf_map_t request;
1484         int i;
1485
1486         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1487                 return -EINVAL;
1488
1489         if (!dma)
1490                 return -EINVAL;
1491
1492         spin_lock(&dev->count_lock);
1493         if (atomic_read(&dev->buf_alloc)) {
1494                 spin_unlock(&dev->count_lock);
1495                 return -EBUSY;
1496         }
1497         dev->buf_use++;         /* Can't allocate more after this call */
1498         spin_unlock(&dev->count_lock);
1499
1500         if (copy_from_user(&request, argp, sizeof(request)))
1501                 return -EFAULT;
1502
1503         if (request.count >= dma->buf_count) {
1504                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1505                     || (drm_core_check_feature(dev, DRIVER_SG)
1506                         && (dma->flags & _DRM_DMA_USE_SG))
1507                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1508                         && (dma->flags & _DRM_DMA_USE_FB))) {
1509                         drm_map_t *map = dev->agp_buffer_map;
1510                         unsigned long token = dev->agp_buffer_token;
1511
1512                         if (!map) {
1513                                 retcode = -EINVAL;
1514                                 goto done;
1515                         }
1516
1517                         down_write(&current->mm->mmap_sem);
1518                         virtual = do_mmap(filp, 0, map->size,
1519                                           PROT_READ | PROT_WRITE,
1520                                           MAP_SHARED, token);
1521                         up_write(&current->mm->mmap_sem);
1522                 } else {
1523                         down_write(&current->mm->mmap_sem);
1524                         virtual = do_mmap(filp, 0, dma->byte_count,
1525                                           PROT_READ | PROT_WRITE,
1526                                           MAP_SHARED, 0);
1527                         up_write(&current->mm->mmap_sem);
1528                 }
1529                 if (virtual > -1024UL) {
1530                         /* Real error */
1531                         retcode = (signed long)virtual;
1532                         goto done;
1533                 }
1534                 request.virtual = (void __user *)virtual;
1535
1536                 for (i = 0; i < dma->buf_count; i++) {
1537                         if (copy_to_user(&request.list[i].idx,
1538                                          &dma->buflist[i]->idx,
1539                                          sizeof(request.list[0].idx))) {
1540                                 retcode = -EFAULT;
1541                                 goto done;
1542                         }
1543                         if (copy_to_user(&request.list[i].total,
1544                                          &dma->buflist[i]->total,
1545                                          sizeof(request.list[0].total))) {
1546                                 retcode = -EFAULT;
1547                                 goto done;
1548                         }
1549                         if (copy_to_user(&request.list[i].used,
1550                                          &zero, sizeof(zero))) {
1551                                 retcode = -EFAULT;
1552                                 goto done;
1553                         }
1554                         address = virtual + dma->buflist[i]->offset;    /* *** */
1555                         if (copy_to_user(&request.list[i].address,
1556                                          &address, sizeof(address))) {
1557                                 retcode = -EFAULT;
1558                                 goto done;
1559                         }
1560                 }
1561         }
1562       done:
1563         request.count = dma->buf_count;
1564         DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1565
1566         if (copy_to_user(argp, &request, sizeof(request)))
1567                 return -EFAULT;
1568
1569         return retcode;
1570 }
1571
1572 /**
1573  * Compute size order.  Returns the exponent of the smaller power of two which
1574  * is greater or equal to given number.
1575  *
1576  * \param size size.
1577  * \return order.
1578  *
1579  * \todo Can be made faster.
1580  */
1581 int drm_order(unsigned long size)
1582 {
1583         int order;
1584         unsigned long tmp;
1585
1586         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1587
1588         if (size & (size - 1))
1589                 ++order;
1590
1591         return order;
1592 }
1593 EXPORT_SYMBOL(drm_order);
1594
1595