drivers/char/drm/drm_bufs.c

   1 /**
   2  * \file drm_bufs.h
   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 EXPORT_SYMBOL(drm_get_resource_len);
  50
  51 static drm_local_map_t *drm_find_matching_map(drm_device_t *dev,
  52                                               drm_local_map_t *map)
  53 {
  54         struct list_head *list;
  55
  56         list_for_each(list, &dev->maplist->head) {
  57                 drm_map_list_t *entry = list_entry(list, drm_map_list_t, head);
  58                 if (entry->map && map->type == entry->map->type &&
  59                     entry->map->offset == map->offset) {
  60                         return entry->map;
  61                 }
  62         }
  63
  64         return NULL;
  65 }
  66
  67 #ifdef CONFIG_COMPAT
  68 /*
  69  * Used to allocate 32-bit handles for _DRM_SHM regions
  70  * The 0x10000000 value is chosen to be out of the way of
  71  * FB/register and GART physical addresses.
  72  */
  73 static unsigned int map32_handle = 0x10000000;
  74 #endif
  75
  76 /**
  77  * Ioctl to specify a range of memory that is available for mapping by a non-root process.
  78  *
  79  * \param inode device inode.
  80  * \param filp file pointer.
  81  * \param cmd command.
  82  * \param arg pointer to a drm_map structure.
  83  * \return zero on success or a negative value on error.
  84  *
  85  * Adjusts the memory offset to its absolute value according to the mapping
  86  * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
  87  * applicable and if supported by the kernel.
  88  */
  89 int drm_addmap(drm_device_t * dev, unsigned int offset,
  90                unsigned int size, drm_map_type_t type,
  91                drm_map_flags_t flags, drm_local_map_t ** map_ptr)
  92 {
  93         drm_map_t *map;
  94         drm_map_list_t *list;
  95         drm_dma_handle_t *dmah;
  96         drm_local_map_t *found_map;
  97
  98         map = drm_alloc( sizeof(*map), DRM_MEM_MAPS );
  99         if ( !map )
 100                 return -ENOMEM;
 101
 102         map->offset = offset;
 103         map->size = size;
 104         map->flags = flags;
 105         map->type = type;
 106
 107         /* Only allow shared memory to be removable since we only keep enough
 108          * book keeping information about shared memory to allow for removal
 109          * when processes fork.
 110          */
 111         if ( (map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM ) {
 112                 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
 113                 return -EINVAL;
 114         }
 115         DRM_DEBUG( "offset = 0x%08lx, size = 0x%08lx, type = %d\n",
 116                    map->offset, map->size, map->type );
 117         if ( (map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK)) ) {
 118                 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
 119                 return -EINVAL;
 120         }
 121         map->mtrr   = -1;
 122         map->handle = NULL;
 123
 124         switch ( map->type ) {
 125         case _DRM_REGISTERS:
 126         case _DRM_FRAME_BUFFER:
 127 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__)
 128                 if ( map->offset + map->size < map->offset ||
 129                      map->offset < virt_to_phys(high_memory) ) {
 130                         drm_free( map, sizeof(*map), DRM_MEM_MAPS );
 131                         return -EINVAL;
 132                 }
 133 #endif
 134 #ifdef __alpha__
 135                 map->offset += dev->hose->mem_space->start;
 136 #endif
 137                 /* Some drivers preinitialize some maps, without the X Server
 138                  * needing to be aware of it.  Therefore, we just return success
 139                  * when the server tries to create a duplicate map.
 140                  */
 141                 found_map = drm_find_matching_map(dev, map);
 142                 if (found_map != NULL) {
 143                         if (found_map->size != map->size) {
 144                                 DRM_DEBUG("Matching maps of type %d with "
 145                                    "mismatched sizes, (%ld vs %ld)\n",
 146                                     map->type, map->size, found_map->size);
 147                                 found_map->size = map->size;
 148                         }
 149
 150                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 151                         *map_ptr = found_map;
 152                         return 0;
 153                 }
 154
 155                 if (drm_core_has_MTRR(dev)) {
 156                         if ( map->type == _DRM_FRAME_BUFFER ||
 157                              (map->flags & _DRM_WRITE_COMBINING) ) {
 158                                 map->mtrr = mtrr_add( map->offset, map->size,
 159                                                       MTRR_TYPE_WRCOMB, 1 );
 160                         }
 161                 }
 162                 if (map->type == _DRM_REGISTERS)
 163                         map->handle = drm_ioremap( map->offset, map->size,
 164                                                     dev );
 165                 break;
 166
 167         case _DRM_SHM:
 168                 map->handle = vmalloc_32(map->size);
 169                 DRM_DEBUG( "%lu %d %p\n",
 170                            map->size, drm_order( map->size ), map->handle );
 171                 if ( !map->handle ) {
 172                         drm_free( map, sizeof(*map), DRM_MEM_MAPS );
 173                         return -ENOMEM;
 174                 }
 175                 map->offset = (unsigned long)map->handle;
 176                 if ( map->flags & _DRM_CONTAINS_LOCK ) {
 177                         /* Prevent a 2nd X Server from creating a 2nd lock */
 178                         if (dev->lock.hw_lock != NULL) {
 179                                 vfree( map->handle );
 180                                 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
 181                                 return -EBUSY;
 182                         }
 183                         dev->sigdata.lock =
 184                         dev->lock.hw_lock = map->handle; /* Pointer to lock */
 185                 }
 186                 break;
 187         case _DRM_AGP:
 188                 if (drm_core_has_AGP(dev)) {
 189 #ifdef __alpha__
 190                         map->offset += dev->hose->mem_space->start;
 191 #endif
 192                         map->offset += dev->agp->base;
 193                         map->mtrr   = dev->agp->agp_mtrr; /* for getmap */
 194                 }
 195                 break;
 196         case _DRM_SCATTER_GATHER:
 197                 if (!dev->sg) {
 198                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 199                         return -EINVAL;
 200                 }
 201                 map->offset += dev->sg->handle;
 202                 break;
 203         case _DRM_CONSISTENT:
 204                 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
 205                  * As we're limiting the address to 2^32-1 (or less),
 206                  * casting it down to 32 bits is no problem, but we
 207                  * need to point to a 64bit variable first. */
 208                 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
 209                 if (!dmah) {
 210                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 211                         return -ENOMEM;
 212                 }
 213                 map->handle = dmah->vaddr;
 214                 map->offset = (unsigned long)dmah->busaddr;
 215                 kfree(dmah);
 216                 break;
 217         default:
 218                 drm_free( map, sizeof(*map), DRM_MEM_MAPS );
 219                 return -EINVAL;
 220         }
 221
 222         list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
 223         if(!list) {
 224                 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 225                 return -EINVAL;
 226         }
 227         memset(list, 0, sizeof(*list));
 228         list->map = map;
 229
 230         down(&dev->struct_sem);
 231         list_add(&list->head, &dev->maplist->head);
 232 #ifdef CONFIG_COMPAT
 233         /* Assign a 32-bit handle for _DRM_SHM mappings */
 234         /* We do it here so that dev->struct_sem protects the increment */
 235         if (map->type == _DRM_SHM)
 236                 map->offset = map32_handle += PAGE_SIZE;
 237 #endif
 238         up(&dev->struct_sem);
 239
 240         *map_ptr = map;
 241         return 0;
 242 }
 243 EXPORT_SYMBOL(drm_addmap);
 244
 245 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
 246                      unsigned int cmd, unsigned long arg)
 247 {
 248         drm_file_t *priv = filp->private_data;
 249         drm_device_t *dev = priv->head->dev;
 250         drm_map_t map;
 251         drm_map_t *map_ptr;
 252         drm_map_t __user *argp = (void __user *)arg;
 253         int err;
 254
 255         if (!(filp->f_mode & 3))
 256                 return -EACCES; /* Require read/write */
 257
 258         if (copy_from_user(& map, argp, sizeof(map))) {
 259                 return -EFAULT;
 260         }
 261
 262         err = drm_addmap( dev, map.offset, map.size, map.type, map.flags,
 263                           &map_ptr );
 264
 265         if (err) {
 266                 return err;
 267         }
 268
 269         if (copy_to_user(argp, map_ptr, sizeof(*map_ptr)))
 270                 return -EFAULT;
 271         if (map_ptr->type != _DRM_SHM) {
 272                 if (copy_to_user(&argp->handle, &map_ptr->offset,
 273                                  sizeof(map_ptr->offset)))
 274                         return -EFAULT;
 275         }
 276         return 0;
 277 }
 278
 279
 280 /**
 281  * Remove a map private from list and deallocate resources if the mapping
 282  * isn't in use.
 283  *
 284  * \param inode device inode.
 285  * \param filp file pointer.
 286  * \param cmd command.
 287  * \param arg pointer to a drm_map_t structure.
 288  * \return zero on success or a negative value on error.
 289  *
 290  * Searches the map on drm_device::maplist, removes it from the list, see if
 291  * its being used, and free any associate resource (such as MTRR's) if it's not
 292  * being on use.
 293  *
 294  * \sa drm_addmap
 295  */
 296 int drm_rmmap_locked(drm_device_t *dev, drm_local_map_t *map)
 297 {
 298         struct list_head *list;
 299         drm_map_list_t *r_list = NULL;
 300         drm_dma_handle_t dmah;
 301
 302         /* Find the list entry for the map and remove it */
 303         list_for_each(list, &dev->maplist->head) {
 304                 r_list = list_entry(list, drm_map_list_t, head);
 305
 306                 if (r_list->map == map) {
 307                         list_del(list);
 308                         drm_free(list, sizeof(*list), DRM_MEM_MAPS);
 309                         break;
 310                 }
 311         }
 312
 313         /* List has wrapped around to the head pointer, or it's empty and we
 314          * didn't find anything.
 315          */
 316         if (list == (&dev->maplist->head)) {
 317                 return -EINVAL;
 318         }
 319
 320         switch (map->type) {
 321         case _DRM_REGISTERS:
 322                 drm_ioremapfree(map->handle, map->size, dev);
 323                 /* FALLTHROUGH */
 324         case _DRM_FRAME_BUFFER:
 325                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 326                         int retcode;
 327                         retcode = mtrr_del(map->mtrr, map->offset,
 328                                            map->size);
 329                         DRM_DEBUG ("mtrr_del=%d\n", retcode);
 330                 }
 331                 break;
 332         case _DRM_SHM:
 333                 vfree(map->handle);
 334                 break;
 335         case _DRM_AGP:
 336         case _DRM_SCATTER_GATHER:
 337                 break;
 338         case _DRM_CONSISTENT:
 339                 dmah.vaddr = map->handle;
 340                 dmah.busaddr = map->offset;
 341                 dmah.size = map->size;
 342                 __drm_pci_free(dev, &dmah);
 343                 break;
 344         }
 345         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 346
 347         return 0;
 348 }
 349 EXPORT_SYMBOL(drm_rmmap_locked);
 350
 351 int drm_rmmap(drm_device_t *dev, drm_local_map_t *map)
 352 {
 353         int ret;
 354
 355         down(&dev->struct_sem);
 356         ret = drm_rmmap_locked(dev, map);
 357         up(&dev->struct_sem);
 358
 359         return ret;
 360 }
 361 EXPORT_SYMBOL(drm_rmmap);
 362
 363 /* The rmmap ioctl appears to be unnecessary.  All mappings are torn down on
 364  * the last close of the device, and this is necessary for cleanup when things
 365  * exit uncleanly.  Therefore, having userland manually remove mappings seems
 366  * like a pointless exercise since they're going away anyway.
 367  *
 368  * One use case might be after addmap is allowed for normal users for SHM and
 369  * gets used by drivers that the server doesn't need to care about.  This seems
 370  * unlikely.
 371  */
 372 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
 373                     unsigned int cmd, unsigned long arg)
 374 {
 375         drm_file_t *priv = filp->private_data;
 376         drm_device_t *dev = priv->head->dev;
 377         drm_map_t request;
 378         drm_local_map_t *map = NULL;
 379         struct list_head *list;
 380         int ret;
 381
 382         if (copy_from_user(&request, (drm_map_t __user *)arg, sizeof(request))) {
 383                 return -EFAULT;
 384         }
 385
 386         down(&dev->struct_sem);
 387         list_for_each(list, &dev->maplist->head) {
 388                 drm_map_list_t *r_list = list_entry(list, drm_map_list_t, head);
 389
 390                 if (r_list->map &&
 391                     r_list->map->handle == request.handle &&
 392                     r_list->map->flags & _DRM_REMOVABLE) {
 393                         map = r_list->map;
 394                         break;
 395                 }
 396         }
 397
 398         /* List has wrapped around to the head pointer, or its empty we didn't
 399          * find anything.
 400          */
 401         if (list == (&dev->maplist->head)) {
 402                 up(&dev->struct_sem);
 403                 return -EINVAL;
 404         }
 405
 406         if (!map)
 407                 return -EINVAL;
 408
 409         /* Register and framebuffer maps are permanent */
 410         if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
 411                 up(&dev->struct_sem);
 412                 return 0;
 413         }
 414
 415         ret = drm_rmmap_locked(dev, map);
 416
 417         up(&dev->struct_sem);
 418
 419         return ret;
 420 }
 421
 422 /**
 423  * Cleanup after an error on one of the addbufs() functions.
 424  *
 425  * \param dev DRM device.
 426  * \param entry buffer entry where the error occurred.
 427  *
 428  * Frees any pages and buffers associated with the given entry.
 429  */
 430 static void drm_cleanup_buf_error(drm_device_t *dev, drm_buf_entry_t *entry)
 431 {
 432         int i;
 433
 434         if (entry->seg_count) {
 435                 for (i = 0; i < entry->seg_count; i++) {
 436                         if (entry->seglist[i]) {
 437                                 drm_free_pages(entry->seglist[i],
 438                                                 entry->page_order,
 439                                                 DRM_MEM_DMA);
 440                         }
 441                 }
 442                 drm_free(entry->seglist,
 443                           entry->seg_count *
 444                           sizeof(*entry->seglist),
 445                           DRM_MEM_SEGS);
 446
 447                 entry->seg_count = 0;
 448         }
 449
 450         if (entry->buf_count) {
 451                 for (i = 0; i < entry->buf_count; i++) {
 452                         if (entry->buflist[i].dev_private) {
 453                                 drm_free(entry->buflist[i].dev_private,
 454                                           entry->buflist[i].dev_priv_size,
 455                                           DRM_MEM_BUFS);
 456                         }
 457                 }
 458                 drm_free(entry->buflist,
 459                           entry->buf_count *
 460                           sizeof(*entry->buflist),
 461                           DRM_MEM_BUFS);
 462
 463                 entry->buf_count = 0;
 464         }
 465 }
 466
 467 #if __OS_HAS_AGP
 468 /**
 469  * Add AGP buffers for DMA transfers.
 470  *
 471  * \param dev drm_device_t to which the buffers are to be added.
 472  * \param request pointer to a drm_buf_desc_t describing the request.
 473  * \return zero on success or a negative number on failure.
 474  *
 475  * After some sanity checks creates a drm_buf structure for each buffer and
 476  * reallocates the buffer list of the same size order to accommodate the new
 477  * buffers.
 478  */
 479 int drm_addbufs_agp(drm_device_t *dev, drm_buf_desc_t *request)
 480 {
 481         drm_device_dma_t *dma = dev->dma;
 482         drm_buf_entry_t *entry;
 483         drm_buf_t *buf;
 484         unsigned long offset;
 485         unsigned long agp_offset;
 486         int count;
 487         int order;
 488         int size;
 489         int alignment;
 490         int page_order;
 491         int total;
 492         int byte_count;
 493         int i;
 494         drm_buf_t **temp_buflist;
 495
 496         if ( !dma ) return -EINVAL;
 497
 498         count = request->count;
 499         order = drm_order(request->size);
 500         size = 1 << order;
 501
 502         alignment  = (request->flags & _DRM_PAGE_ALIGN)
 503                 ? PAGE_ALIGN(size) : size;
 504         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 505         total = PAGE_SIZE << page_order;
 506
 507         byte_count = 0;
 508         agp_offset = dev->agp->base + request->agp_start;
 509
 510         DRM_DEBUG( "count:      %d\n",  count );
 511         DRM_DEBUG( "order:      %d\n",  order );
 512         DRM_DEBUG( "size:       %d\n",  size );
 513         DRM_DEBUG( "agp_offset: %lu\n", agp_offset );
 514         DRM_DEBUG( "alignment:  %d\n",  alignment );
 515         DRM_DEBUG( "page_order: %d\n",  page_order );
 516         DRM_DEBUG( "total:      %d\n",  total );
 517
 518         if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
 519         if ( dev->queue_count ) return -EBUSY; /* Not while in use */
 520
 521         spin_lock( &dev->count_lock );
 522         if ( dev->buf_use ) {
 523                 spin_unlock( &dev->count_lock );
 524                 return -EBUSY;
 525         }
 526         atomic_inc( &dev->buf_alloc );
 527         spin_unlock( &dev->count_lock );
 528
 529         down( &dev->struct_sem );
 530         entry = &dma->bufs[order];
 531         if ( entry->buf_count ) {
 532                 up( &dev->struct_sem );
 533                 atomic_dec( &dev->buf_alloc );
 534                 return -ENOMEM; /* May only call once for each order */
 535         }
 536
 537         if (count < 0 || count > 4096) {
 538                 up( &dev->struct_sem );
 539                 atomic_dec( &dev->buf_alloc );
 540                 return -EINVAL;
 541         }
 542
 543         entry->buflist = drm_alloc( count * sizeof(*entry->buflist),
 544                                     DRM_MEM_BUFS );
 545         if ( !entry->buflist ) {
 546                 up( &dev->struct_sem );
 547                 atomic_dec( &dev->buf_alloc );
 548                 return -ENOMEM;
 549         }
 550         memset( entry->buflist, 0, count * sizeof(*entry->buflist) );
 551
 552         entry->buf_size = size;
 553         entry->page_order = page_order;
 554
 555         offset = 0;
 556
 557         while ( entry->buf_count < count ) {
 558                 buf          = &entry->buflist[entry->buf_count];
 559                 buf->idx     = dma->buf_count + entry->buf_count;
 560                 buf->total   = alignment;
 561                 buf->order   = order;
 562                 buf->used    = 0;
 563
 564                 buf->offset  = (dma->byte_count + offset);
 565                 buf->bus_address = agp_offset + offset;
 566                 buf->address = (void *)(agp_offset + offset);
 567                 buf->next    = NULL;
 568                 buf->waiting = 0;
 569                 buf->pending = 0;
 570                 init_waitqueue_head( &buf->dma_wait );
 571                 buf->filp    = NULL;
 572
 573                 buf->dev_priv_size = dev->driver->dev_priv_size;
 574                 buf->dev_private = drm_alloc( buf->dev_priv_size,
 575                                                DRM_MEM_BUFS );
 576                 if(!buf->dev_private) {
 577                         /* Set count correctly so we free the proper amount. */
 578                         entry->buf_count = count;
 579                         drm_cleanup_buf_error(dev,entry);
 580                         up( &dev->struct_sem );
 581                         atomic_dec( &dev->buf_alloc );
 582                         return -ENOMEM;
 583                 }
 584                 memset( buf->dev_private, 0, buf->dev_priv_size );
 585
 586                 DRM_DEBUG( "buffer %d @ %p\n",
 587                            entry->buf_count, buf->address );
 588
 589                 offset += alignment;
 590                 entry->buf_count++;
 591                 byte_count += PAGE_SIZE << page_order;
 592         }
 593
 594         DRM_DEBUG( "byte_count: %d\n", byte_count );
 595
 596         temp_buflist = drm_realloc( dma->buflist,
 597                                      dma->buf_count * sizeof(*dma->buflist),
 598                                      (dma->buf_count + entry->buf_count)
 599                                      * sizeof(*dma->buflist),
 600                                      DRM_MEM_BUFS );
 601         if(!temp_buflist) {
 602                 /* Free the entry because it isn't valid */
 603                 drm_cleanup_buf_error(dev,entry);
 604                 up( &dev->struct_sem );
 605                 atomic_dec( &dev->buf_alloc );
 606                 return -ENOMEM;
 607         }
 608         dma->buflist = temp_buflist;
 609
 610         for ( i = 0 ; i < entry->buf_count ; i++ ) {
 611                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 612         }
 613
 614         dma->buf_count += entry->buf_count;
 615         dma->byte_count += byte_count;
 616
 617         DRM_DEBUG( "dma->buf_count : %d\n", dma->buf_count );
 618         DRM_DEBUG( "entry->buf_count : %d\n", entry->buf_count );
 619
 620         up( &dev->struct_sem );
 621
 622         request->count = entry->buf_count;
 623         request->size = size;
 624
 625         dma->flags = _DRM_DMA_USE_AGP;
 626
 627         atomic_dec( &dev->buf_alloc );
 628         return 0;
 629 }
 630 EXPORT_SYMBOL(drm_addbufs_agp);
 631 #endif /* __OS_HAS_AGP */
 632
 633 int drm_addbufs_pci(drm_device_t *dev, drm_buf_desc_t *request)
 634 {
 635         drm_device_dma_t *dma = dev->dma;
 636         int count;
 637         int order;
 638         int size;
 639         int total;
 640         int page_order;
 641         drm_buf_entry_t *entry;
 642         unsigned long page;
 643         drm_buf_t *buf;
 644         int alignment;
 645         unsigned long offset;
 646         int i;
 647         int byte_count;
 648         int page_count;
 649         unsigned long *temp_pagelist;
 650         drm_buf_t **temp_buflist;
 651
 652         if (!drm_core_check_feature(dev, DRIVER_PCI_DMA)) return -EINVAL;
 653         if ( !dma ) return -EINVAL;
 654
 655         count = request->count;
 656         order = drm_order(request->size);
 657         size = 1 << order;
 658
 659         DRM_DEBUG( "count=%d, size=%d (%d), order=%d, queue_count=%d\n",
 660                    request->count, request->size, size,
 661                    order, dev->queue_count );
 662
 663         if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
 664         if ( dev->queue_count ) return -EBUSY; /* Not while in use */
 665
 666         alignment = (request->flags & _DRM_PAGE_ALIGN)
 667                 ? PAGE_ALIGN(size) : size;
 668         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 669         total = PAGE_SIZE << page_order;
 670
 671         spin_lock( &dev->count_lock );
 672         if ( dev->buf_use ) {
 673                 spin_unlock( &dev->count_lock );
 674                 return -EBUSY;
 675         }
 676         atomic_inc( &dev->buf_alloc );
 677         spin_unlock( &dev->count_lock );
 678
 679         down( &dev->struct_sem );
 680         entry = &dma->bufs[order];
 681         if ( entry->buf_count ) {
 682                 up( &dev->struct_sem );
 683                 atomic_dec( &dev->buf_alloc );
 684                 return -ENOMEM; /* May only call once for each order */
 685         }
 686
 687         if (count < 0 || count > 4096) {
 688                 up( &dev->struct_sem );
 689                 atomic_dec( &dev->buf_alloc );
 690                 return -EINVAL;
 691         }
 692
 693         entry->buflist = drm_alloc( count * sizeof(*entry->buflist),
 694                                     DRM_MEM_BUFS );
 695         if ( !entry->buflist ) {
 696                 up( &dev->struct_sem );
 697                 atomic_dec( &dev->buf_alloc );
 698                 return -ENOMEM;
 699         }
 700         memset( entry->buflist, 0, count * sizeof(*entry->buflist) );
 701
 702         entry->seglist = drm_alloc( count * sizeof(*entry->seglist),
 703                                     DRM_MEM_SEGS );
 704         if ( !entry->seglist ) {
 705                 drm_free( entry->buflist,
 706                           count * sizeof(*entry->buflist),
 707                           DRM_MEM_BUFS );
 708                 up( &dev->struct_sem );
 709                 atomic_dec( &dev->buf_alloc );
 710                 return -ENOMEM;
 711         }
 712         memset( entry->seglist, 0, count * sizeof(*entry->seglist) );
 713
 714         /* Keep the original pagelist until we know all the allocations
 715          * have succeeded
 716          */
 717         temp_pagelist = drm_alloc( (dma->page_count + (count << page_order))
 718                                     * sizeof(*dma->pagelist),
 719                                     DRM_MEM_PAGES );
 720         if (!temp_pagelist) {
 721                 drm_free( entry->buflist,
 722                            count * sizeof(*entry->buflist),
 723                            DRM_MEM_BUFS );
 724                 drm_free( entry->seglist,
 725                            count * sizeof(*entry->seglist),
 726                            DRM_MEM_SEGS );
 727                 up( &dev->struct_sem );
 728                 atomic_dec( &dev->buf_alloc );
 729                 return -ENOMEM;
 730         }
 731         memcpy(temp_pagelist,
 732                dma->pagelist,
 733                dma->page_count * sizeof(*dma->pagelist));
 734         DRM_DEBUG( "pagelist: %d entries\n",
 735                    dma->page_count + (count << page_order) );
 736
 737         entry->buf_size = size;
 738         entry->page_order = page_order;
 739         byte_count = 0;
 740         page_count = 0;
 741
 742         while ( entry->buf_count < count ) {
 743                 page = drm_alloc_pages( page_order, DRM_MEM_DMA );
 744                 if ( !page ) {
 745                         /* Set count correctly so we free the proper amount. */
 746                         entry->buf_count = count;
 747                         entry->seg_count = count;
 748                         drm_cleanup_buf_error(dev, entry);
 749                         drm_free( temp_pagelist,
 750                                    (dma->page_count + (count << page_order))
 751                                    * sizeof(*dma->pagelist),
 752                                    DRM_MEM_PAGES );
 753                         up( &dev->struct_sem );
 754                         atomic_dec( &dev->buf_alloc );
 755                         return -ENOMEM;
 756                 }
 757                 entry->seglist[entry->seg_count++] = page;
 758                 for ( i = 0 ; i < (1 << page_order) ; i++ ) {
 759                         DRM_DEBUG( "page %d @ 0x%08lx\n",
 760                                    dma->page_count + page_count,
 761                                    page + PAGE_SIZE * i );
 762                         temp_pagelist[dma->page_count + page_count++]
 763                                 = page + PAGE_SIZE * i;
 764                 }
 765                 for ( offset = 0 ;
 766                       offset + size <= total && entry->buf_count < count ;
 767                       offset += alignment, ++entry->buf_count ) {
 768                         buf          = &entry->buflist[entry->buf_count];
 769                         buf->idx     = dma->buf_count + entry->buf_count;
 770                         buf->total   = alignment;
 771                         buf->order   = order;
 772                         buf->used    = 0;
 773                         buf->offset  = (dma->byte_count + byte_count + offset);
 774                         buf->address = (void *)(page + offset);
 775                         buf->next    = NULL;
 776                         buf->waiting = 0;
 777                         buf->pending = 0;
 778                         init_waitqueue_head( &buf->dma_wait );
 779                         buf->filp    = NULL;
 780
 781                         buf->dev_priv_size = dev->driver->dev_priv_size;
 782                         buf->dev_private = drm_alloc( buf->dev_priv_size,
 783                                                        DRM_MEM_BUFS );
 784                         if(!buf->dev_private) {
 785                                 /* Set count correctly so we free the proper amount. */
 786                                 entry->buf_count = count;
 787                                 entry->seg_count = count;
 788                                 drm_cleanup_buf_error(dev,entry);
 789                                 drm_free( temp_pagelist,
 790                                            (dma->page_count + (count << page_order))
 791                                            * sizeof(*dma->pagelist),
 792                                            DRM_MEM_PAGES );
 793                                 up( &dev->struct_sem );
 794                                 atomic_dec( &dev->buf_alloc );
 795                                 return -ENOMEM;
 796                         }
 797                         memset( buf->dev_private, 0, buf->dev_priv_size );
 798
 799                         DRM_DEBUG( "buffer %d @ %p\n",
 800                                    entry->buf_count, buf->address );
 801                 }
 802                 byte_count += PAGE_SIZE << page_order;
 803         }
 804
 805         temp_buflist = drm_realloc( dma->buflist,
 806                                      dma->buf_count * sizeof(*dma->buflist),
 807                                      (dma->buf_count + entry->buf_count)
 808                                      * sizeof(*dma->buflist),
 809                                      DRM_MEM_BUFS );
 810         if (!temp_buflist) {
 811                 /* Free the entry because it isn't valid */
 812                 drm_cleanup_buf_error(dev,entry);
 813                 drm_free( temp_pagelist,
 814                            (dma->page_count + (count << page_order))
 815                            * sizeof(*dma->pagelist),
 816                            DRM_MEM_PAGES );
 817                 up( &dev->struct_sem );
 818                 atomic_dec( &dev->buf_alloc );
 819                 return -ENOMEM;
 820         }
 821         dma->buflist = temp_buflist;
 822
 823         for ( i = 0 ; i < entry->buf_count ; i++ ) {
 824                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 825         }
 826
 827         /* No allocations failed, so now we can replace the orginal pagelist
 828          * with the new one.
 829          */
 830         if (dma->page_count) {
 831                 drm_free(dma->pagelist,
 832                           dma->page_count * sizeof(*dma->pagelist),
 833                           DRM_MEM_PAGES);
 834         }
 835         dma->pagelist = temp_pagelist;
 836
 837         dma->buf_count += entry->buf_count;
 838         dma->seg_count += entry->seg_count;
 839         dma->page_count += entry->seg_count << page_order;
 840         dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
 841
 842         up( &dev->struct_sem );
 843
 844         request->count = entry->buf_count;
 845         request->size = size;
 846
 847         atomic_dec( &dev->buf_alloc );
 848         return 0;
 849
 850 }
 851 EXPORT_SYMBOL(drm_addbufs_pci);
 852
 853 static int drm_addbufs_sg(drm_device_t *dev, drm_buf_desc_t *request)
 854 {
 855         drm_device_dma_t *dma = dev->dma;
 856         drm_buf_entry_t *entry;
 857         drm_buf_t *buf;
 858         unsigned long offset;
 859         unsigned long agp_offset;
 860         int count;
 861         int order;
 862         int size;
 863         int alignment;
 864         int page_order;
 865         int total;
 866         int byte_count;
 867         int i;
 868         drm_buf_t **temp_buflist;
 869
 870         if (!drm_core_check_feature(dev, DRIVER_SG)) return -EINVAL;
 871
 872         if ( !dma ) return -EINVAL;
 873
 874         count = request->count;
 875         order = drm_order(request->size);
 876         size = 1 << order;
 877
 878         alignment  = (request->flags & _DRM_PAGE_ALIGN)
 879                         ? PAGE_ALIGN(size) : size;
 880         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
 881         total = PAGE_SIZE << page_order;
 882
 883         byte_count = 0;
 884         agp_offset = request->agp_start;
 885
 886         DRM_DEBUG( "count:      %d\n",  count );
 887         DRM_DEBUG( "order:      %d\n",  order );
 888         DRM_DEBUG( "size:       %d\n",  size );
 889         DRM_DEBUG( "agp_offset: %lu\n", agp_offset );
 890         DRM_DEBUG( "alignment:  %d\n",  alignment );
 891         DRM_DEBUG( "page_order: %d\n",  page_order );
 892         DRM_DEBUG( "total:      %d\n",  total );
 893
 894         if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
 895         if ( dev->queue_count ) return -EBUSY; /* Not while in use */
 896
 897         spin_lock( &dev->count_lock );
 898         if ( dev->buf_use ) {
 899                 spin_unlock( &dev->count_lock );
 900                 return -EBUSY;
 901         }
 902         atomic_inc( &dev->buf_alloc );
 903         spin_unlock( &dev->count_lock );
 904
 905         down( &dev->struct_sem );
 906         entry = &dma->bufs[order];
 907         if ( entry->buf_count ) {
 908                 up( &dev->struct_sem );
 909                 atomic_dec( &dev->buf_alloc );
 910                 return -ENOMEM; /* May only call once for each order */
 911         }
 912
 913         if (count < 0 || count > 4096) {
 914                 up( &dev->struct_sem );
 915                 atomic_dec( &dev->buf_alloc );
 916                 return -EINVAL;
 917         }
 918
 919         entry->buflist = drm_alloc( count * sizeof(*entry->buflist),
 920                                      DRM_MEM_BUFS );
 921         if ( !entry->buflist ) {
 922                 up( &dev->struct_sem );
 923                 atomic_dec( &dev->buf_alloc );
 924                 return -ENOMEM;
 925         }
 926         memset( entry->buflist, 0, count * sizeof(*entry->buflist) );
 927
 928         entry->buf_size = size;
 929         entry->page_order = page_order;
 930
 931         offset = 0;
 932
 933         while ( entry->buf_count < count ) {
 934                 buf          = &entry->buflist[entry->buf_count];
 935                 buf->idx     = dma->buf_count + entry->buf_count;
 936                 buf->total   = alignment;
 937                 buf->order   = order;
 938                 buf->used    = 0;
 939
 940                 buf->offset  = (dma->byte_count + offset);
 941                 buf->bus_address = agp_offset + offset;
 942                 buf->address = (void *)(agp_offset + offset + dev->sg->handle);
 943                 buf->next    = NULL;
 944                 buf->waiting = 0;
 945                 buf->pending = 0;
 946                 init_waitqueue_head( &buf->dma_wait );
 947                 buf->filp    = NULL;
 948
 949                 buf->dev_priv_size = dev->driver->dev_priv_size;
 950                 buf->dev_private = drm_alloc( buf->dev_priv_size,
 951                                                DRM_MEM_BUFS );
 952                 if(!buf->dev_private) {
 953                         /* Set count correctly so we free the proper amount. */
 954                         entry->buf_count = count;
 955                         drm_cleanup_buf_error(dev,entry);
 956                         up( &dev->struct_sem );
 957                         atomic_dec( &dev->buf_alloc );
 958                         return -ENOMEM;
 959                 }
 960
 961                 memset( buf->dev_private, 0, buf->dev_priv_size );
 962
 963                 DRM_DEBUG( "buffer %d @ %p\n",
 964                            entry->buf_count, buf->address );
 965
 966                 offset += alignment;
 967                 entry->buf_count++;
 968                 byte_count += PAGE_SIZE << page_order;
 969         }
 970
 971         DRM_DEBUG( "byte_count: %d\n", byte_count );
 972
 973         temp_buflist = drm_realloc( dma->buflist,
 974                                      dma->buf_count * sizeof(*dma->buflist),
 975                                      (dma->buf_count + entry->buf_count)
 976                                      * sizeof(*dma->buflist),
 977                                      DRM_MEM_BUFS );
 978         if(!temp_buflist) {
 979                 /* Free the entry because it isn't valid */
 980                 drm_cleanup_buf_error(dev,entry);
 981                 up( &dev->struct_sem );
 982                 atomic_dec( &dev->buf_alloc );
 983                 return -ENOMEM;
 984         }
 985         dma->buflist = temp_buflist;
 986
 987         for ( i = 0 ; i < entry->buf_count ; i++ ) {
 988                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
 989         }
 990
 991         dma->buf_count += entry->buf_count;
 992         dma->byte_count += byte_count;
 993
 994         DRM_DEBUG( "dma->buf_count : %d\n", dma->buf_count );
 995         DRM_DEBUG( "entry->buf_count : %d\n", entry->buf_count );
 996
 997         up( &dev->struct_sem );
 998
 999         request->count = entry->buf_count;
1000         request->size = size;
1001
1002         dma->flags = _DRM_DMA_USE_SG;
1003
1004         atomic_dec( &dev->buf_alloc );
1005         return 0;
1006 }
1007
1008 int drm_addbufs_fb(drm_device_t *dev, drm_buf_desc_t *request)
1009 {
1010         drm_device_dma_t *dma = dev->dma;
1011         drm_buf_entry_t *entry;
1012         drm_buf_t *buf;
1013         unsigned long offset;
1014         unsigned long agp_offset;
1015         int count;
1016         int order;
1017         int size;
1018         int alignment;
1019         int page_order;
1020         int total;
1021         int byte_count;
1022         int i;
1023         drm_buf_t **temp_buflist;
1024
1025         if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1026                 return -EINVAL;
1027
1028         if (!dma)
1029                 return -EINVAL;
1030
1031         count = request->count;
1032         order = drm_order(request->size);
1033         size = 1 << order;
1034
1035         alignment = (request->flags & _DRM_PAGE_ALIGN)
1036             ? PAGE_ALIGN(size) : size;
1037         page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1038         total = PAGE_SIZE << page_order;
1039
1040         byte_count = 0;
1041         agp_offset = request->agp_start;
1042
1043         DRM_DEBUG("count:      %d\n", count);
1044         DRM_DEBUG("order:      %d\n", order);
1045         DRM_DEBUG("size:       %d\n", size);
1046         DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1047         DRM_DEBUG("alignment:  %d\n", alignment);
1048         DRM_DEBUG("page_order: %d\n", page_order);
1049         DRM_DEBUG("total:      %d\n", total);
1050
1051         if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1052                 return -EINVAL;
1053         if (dev->queue_count)
1054                 return -EBUSY;  /* Not while in use */
1055
1056         spin_lock(&dev->count_lock);
1057         if (dev->buf_use) {
1058                 spin_unlock(&dev->count_lock);
1059                 return -EBUSY;
1060         }
1061         atomic_inc(&dev->buf_alloc);
1062         spin_unlock(&dev->count_lock);
1063
1064         down(&dev->struct_sem);
1065         entry = &dma->bufs[order];
1066         if (entry->buf_count) {
1067                 up(&dev->struct_sem);
1068                 atomic_dec(&dev->buf_alloc);
1069                 return -ENOMEM; /* May only call once for each order */
1070         }
1071
1072         if (count < 0 || count > 4096) {
1073                 up(&dev->struct_sem);
1074                 atomic_dec(&dev->buf_alloc);
1075                 return -EINVAL;
1076         }
1077
1078         entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1079                                    DRM_MEM_BUFS);
1080         if (!entry->buflist) {
1081                 up(&dev->struct_sem);
1082                 atomic_dec(&dev->buf_alloc);
1083                 return -ENOMEM;
1084         }
1085         memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1086
1087         entry->buf_size = size;
1088         entry->page_order = page_order;
1089
1090         offset = 0;
1091
1092         while (entry->buf_count < count) {
1093                 buf = &entry->buflist[entry->buf_count];
1094                 buf->idx = dma->buf_count + entry->buf_count;
1095                 buf->total = alignment;
1096                 buf->order = order;
1097                 buf->used = 0;
1098
1099                 buf->offset = (dma->byte_count + offset);
1100                 buf->bus_address = agp_offset + offset;
1101                 buf->address = (void *)(agp_offset + offset);
1102                 buf->next = NULL;
1103                 buf->waiting = 0;
1104                 buf->pending = 0;
1105                 init_waitqueue_head(&buf->dma_wait);
1106                 buf->filp = NULL;
1107
1108                 buf->dev_priv_size = dev->driver->dev_priv_size;
1109                 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1110                 if (!buf->dev_private) {
1111                         /* Set count correctly so we free the proper amount. */
1112                         entry->buf_count = count;
1113                         drm_cleanup_buf_error(dev, entry);
1114                         up(&dev->struct_sem);
1115                         atomic_dec(&dev->buf_alloc);
1116                         return -ENOMEM;
1117                 }
1118                 memset(buf->dev_private, 0, buf->dev_priv_size);
1119
1120                 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1121
1122                 offset += alignment;
1123                 entry->buf_count++;
1124                 byte_count += PAGE_SIZE << page_order;
1125         }
1126
1127         DRM_DEBUG("byte_count: %d\n", byte_count);
1128
1129         temp_buflist = drm_realloc(dma->buflist,
1130                                    dma->buf_count * sizeof(*dma->buflist),
1131                                    (dma->buf_count + entry->buf_count)
1132                                    * sizeof(*dma->buflist), DRM_MEM_BUFS);
1133         if (!temp_buflist) {
1134                 /* Free the entry because it isn't valid */
1135                 drm_cleanup_buf_error(dev, entry);
1136                 up(&dev->struct_sem);
1137                 atomic_dec(&dev->buf_alloc);
1138                 return -ENOMEM;
1139         }
1140         dma->buflist = temp_buflist;
1141
1142         for (i = 0; i < entry->buf_count; i++) {
1143                 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1144         }
1145
1146         dma->buf_count += entry->buf_count;
1147         dma->byte_count += byte_count;
1148
1149         DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1150         DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1151
1152         up(&dev->struct_sem);
1153
1154         request->count = entry->buf_count;
1155         request->size = size;
1156
1157         dma->flags = _DRM_DMA_USE_FB;
1158
1159         atomic_dec(&dev->buf_alloc);
1160         return 0;
1161 }
1162
1163 /**
1164  * Add buffers for DMA transfers (ioctl).
1165  *
1166  * \param inode device inode.
1167  * \param filp file pointer.
1168  * \param cmd command.
1169  * \param arg pointer to a drm_buf_desc_t request.
1170  * \return zero on success or a negative number on failure.
1171  *
1172  * According with the memory type specified in drm_buf_desc::flags and the
1173  * build options, it dispatches the call either to addbufs_agp(),
1174  * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1175  * PCI memory respectively.
1176  */
1177 int drm_addbufs( struct inode *inode, struct file *filp,
1178                   unsigned int cmd, unsigned long arg )
1179 {
1180         drm_buf_desc_t request;
1181         drm_file_t *priv = filp->private_data;
1182         drm_device_t *dev = priv->head->dev;
1183         int ret;
1184
1185         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1186                 return -EINVAL;
1187
1188         if ( copy_from_user( &request, (drm_buf_desc_t __user *)arg,
1189                              sizeof(request) ) )
1190                 return -EFAULT;
1191
1192 #if __OS_HAS_AGP
1193         if ( request.flags & _DRM_AGP_BUFFER )
1194                 ret=drm_addbufs_agp(dev, &request);
1195         else
1196 #endif
1197         if ( request.flags & _DRM_SG_BUFFER )
1198                 ret=drm_addbufs_sg(dev, &request);
1199         else if ( request.flags & _DRM_FB_BUFFER)
1200                 ret=drm_addbufs_fb(dev, &request);
1201         else
1202                 ret=drm_addbufs_pci(dev, &request);
1203
1204         if (ret==0) {
1205                 if (copy_to_user((void __user *)arg, &request,
1206                                  sizeof(request))) {
1207                         ret = -EFAULT;
1208                 }
1209         }
1210         return ret;
1211 }
1212
1213
1214 /**
1215  * Get information about the buffer mappings.
1216  *
1217  * This was originally mean for debugging purposes, or by a sophisticated
1218  * client library to determine how best to use the available buffers (e.g.,
1219  * large buffers can be used for image transfer).
1220  *
1221  * \param inode device inode.
1222  * \param filp file pointer.
1223  * \param cmd command.
1224  * \param arg pointer to a drm_buf_info structure.
1225  * \return zero on success or a negative number on failure.
1226  *
1227  * Increments drm_device::buf_use while holding the drm_device::count_lock
1228  * lock, preventing of allocating more buffers after this call. Information
1229  * about each requested buffer is then copied into user space.
1230  */
1231 int drm_infobufs( struct inode *inode, struct file *filp,
1232                    unsigned int cmd, unsigned long arg )
1233 {
1234         drm_file_t *priv = filp->private_data;
1235         drm_device_t *dev = priv->head->dev;
1236         drm_device_dma_t *dma = dev->dma;
1237         drm_buf_info_t request;
1238         drm_buf_info_t __user *argp = (void __user *)arg;
1239         int i;
1240         int count;
1241
1242         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1243                 return -EINVAL;
1244
1245         if ( !dma ) return -EINVAL;
1246
1247         spin_lock( &dev->count_lock );
1248         if ( atomic_read( &dev->buf_alloc ) ) {
1249                 spin_unlock( &dev->count_lock );
1250                 return -EBUSY;
1251         }
1252         ++dev->buf_use;         /* Can't allocate more after this call */
1253         spin_unlock( &dev->count_lock );
1254
1255         if ( copy_from_user( &request, argp, sizeof(request) ) )
1256                 return -EFAULT;
1257
1258         for ( i = 0, count = 0 ; i < DRM_MAX_ORDER + 1 ; i++ ) {
1259                 if ( dma->bufs[i].buf_count ) ++count;
1260         }
1261
1262         DRM_DEBUG( "count = %d\n", count );
1263
1264         if ( request.count >= count ) {
1265                 for ( i = 0, count = 0 ; i < DRM_MAX_ORDER + 1 ; i++ ) {
1266                         if ( dma->bufs[i].buf_count ) {
1267                                 drm_buf_desc_t __user *to = &request.list[count];
1268                                 drm_buf_entry_t *from = &dma->bufs[i];
1269                                 drm_freelist_t *list = &dma->bufs[i].freelist;
1270                                 if ( copy_to_user( &to->count,
1271                                                    &from->buf_count,
1272                                                    sizeof(from->buf_count) ) ||
1273                                      copy_to_user( &to->size,
1274                                                    &from->buf_size,
1275                                                    sizeof(from->buf_size) ) ||
1276                                      copy_to_user( &to->low_mark,
1277                                                    &list->low_mark,
1278                                                    sizeof(list->low_mark) ) ||
1279                                      copy_to_user( &to->high_mark,
1280                                                    &list->high_mark,
1281                                                    sizeof(list->high_mark) ) )
1282                                         return -EFAULT;
1283
1284                                 DRM_DEBUG( "%d %d %d %d %d\n",
1285                                            i,
1286                                            dma->bufs[i].buf_count,
1287                                            dma->bufs[i].buf_size,
1288                                            dma->bufs[i].freelist.low_mark,
1289                                            dma->bufs[i].freelist.high_mark );
1290                                 ++count;
1291                         }
1292                 }
1293         }
1294         request.count = count;
1295
1296         if ( copy_to_user( argp, &request, sizeof(request) ) )
1297                 return -EFAULT;
1298
1299         return 0;
1300 }
1301
1302 /**
1303  * Specifies a low and high water mark for buffer allocation
1304  *
1305  * \param inode device inode.
1306  * \param filp file pointer.
1307  * \param cmd command.
1308  * \param arg a pointer to a drm_buf_desc structure.
1309  * \return zero on success or a negative number on failure.
1310  *
1311  * Verifies that the size order is bounded between the admissible orders and
1312  * updates the respective drm_device_dma::bufs entry low and high water mark.
1313  *
1314  * \note This ioctl is deprecated and mostly never used.
1315  */
1316 int drm_markbufs( struct inode *inode, struct file *filp,
1317                    unsigned int cmd, unsigned long arg )
1318 {
1319         drm_file_t *priv = filp->private_data;
1320         drm_device_t *dev = priv->head->dev;
1321         drm_device_dma_t *dma = dev->dma;
1322         drm_buf_desc_t request;
1323         int order;
1324         drm_buf_entry_t *entry;
1325
1326         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1327                 return -EINVAL;
1328
1329         if ( !dma ) return -EINVAL;
1330
1331         if ( copy_from_user( &request,
1332                              (drm_buf_desc_t __user *)arg,
1333                              sizeof(request) ) )
1334                 return -EFAULT;
1335
1336         DRM_DEBUG( "%d, %d, %d\n",
1337                    request.size, request.low_mark, request.high_mark );
1338         order = drm_order( request.size );
1339         if ( order < DRM_MIN_ORDER || order > DRM_MAX_ORDER ) return -EINVAL;
1340         entry = &dma->bufs[order];
1341
1342         if ( request.low_mark < 0 || request.low_mark > entry->buf_count )
1343                 return -EINVAL;
1344         if ( request.high_mark < 0 || request.high_mark > entry->buf_count )
1345                 return -EINVAL;
1346
1347         entry->freelist.low_mark  = request.low_mark;
1348         entry->freelist.high_mark = request.high_mark;
1349
1350         return 0;
1351 }
1352
1353 /**
1354  * Unreserve the buffers in list, previously reserved using drmDMA.
1355  *
1356  * \param inode device inode.
1357  * \param filp file pointer.
1358  * \param cmd command.
1359  * \param arg pointer to a drm_buf_free structure.
1360  * \return zero on success or a negative number on failure.
1361  *
1362  * Calls free_buffer() for each used buffer.
1363  * This function is primarily used for debugging.
1364  */
1365 int drm_freebufs( struct inode *inode, struct file *filp,
1366                    unsigned int cmd, unsigned long arg )
1367 {
1368         drm_file_t *priv = filp->private_data;
1369         drm_device_t *dev = priv->head->dev;
1370         drm_device_dma_t *dma = dev->dma;
1371         drm_buf_free_t request;
1372         int i;
1373         int idx;
1374         drm_buf_t *buf;
1375
1376         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1377                 return -EINVAL;
1378
1379         if ( !dma ) return -EINVAL;
1380
1381         if ( copy_from_user( &request,
1382                              (drm_buf_free_t __user *)arg,
1383                              sizeof(request) ) )
1384                 return -EFAULT;
1385
1386         DRM_DEBUG( "%d\n", request.count );
1387         for ( i = 0 ; i < request.count ; i++ ) {
1388                 if ( copy_from_user( &idx,
1389                                      &request.list[i],
1390                                      sizeof(idx) ) )
1391                         return -EFAULT;
1392                 if ( idx < 0 || idx >= dma->buf_count ) {
1393                         DRM_ERROR( "Index %d (of %d max)\n",
1394                                    idx, dma->buf_count - 1 );
1395                         return -EINVAL;
1396                 }
1397                 buf = dma->buflist[idx];
1398                 if ( buf->filp != filp ) {
1399                         DRM_ERROR( "Process %d freeing buffer not owned\n",
1400                                    current->pid );
1401                         return -EINVAL;
1402                 }
1403                 drm_free_buffer( dev, buf );
1404         }
1405
1406         return 0;
1407 }
1408
1409 /**
1410  * Maps all of the DMA buffers into client-virtual space (ioctl).
1411  *
1412  * \param inode device inode.
1413  * \param filp file pointer.
1414  * \param cmd command.
1415  * \param arg pointer to a drm_buf_map structure.
1416  * \return zero on success or a negative number on failure.
1417  *
1418  * Maps the AGP or SG buffer region with do_mmap(), and copies information
1419  * about each buffer into user space. The PCI buffers are already mapped on the
1420  * addbufs_pci() call.
1421  */
1422 int drm_mapbufs( struct inode *inode, struct file *filp,
1423                   unsigned int cmd, unsigned long arg )
1424 {
1425         drm_file_t *priv = filp->private_data;
1426         drm_device_t *dev = priv->head->dev;
1427         drm_device_dma_t *dma = dev->dma;
1428         drm_buf_map_t __user *argp = (void __user *)arg;
1429         int retcode = 0;
1430         const int zero = 0;
1431         unsigned long virtual;
1432         unsigned long address;
1433         drm_buf_map_t request;
1434         int i;
1435
1436         if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1437                 return -EINVAL;
1438
1439         if ( !dma ) return -EINVAL;
1440
1441         spin_lock( &dev->count_lock );
1442         if ( atomic_read( &dev->buf_alloc ) ) {
1443                 spin_unlock( &dev->count_lock );
1444                 return -EBUSY;
1445         }
1446         dev->buf_use++;         /* Can't allocate more after this call */
1447         spin_unlock( &dev->count_lock );
1448
1449         if ( copy_from_user( &request, argp, sizeof(request) ) )
1450                 return -EFAULT;
1451
1452         if ( request.count >= dma->buf_count ) {
1453                 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1454                     || (drm_core_check_feature(dev, DRIVER_SG)
1455                         && (dma->flags & _DRM_DMA_USE_SG))
1456                     || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1457                         && (dma->flags & _DRM_DMA_USE_FB))) {
1458                         drm_map_t *map = dev->agp_buffer_map;
1459
1460                         if ( !map ) {
1461                                 retcode = -EINVAL;
1462                                 goto done;
1463                         }
1464
1465 #if LINUX_VERSION_CODE <= 0x020402
1466                         down( &current->mm->mmap_sem );
1467 #else
1468                         down_write( &current->mm->mmap_sem );
1469 #endif
1470                         virtual = do_mmap( filp, 0, map->size,
1471                                            PROT_READ | PROT_WRITE,
1472                                            MAP_SHARED,
1473                                            (unsigned long)map->offset );
1474 #if LINUX_VERSION_CODE <= 0x020402
1475                         up( &current->mm->mmap_sem );
1476 #else
1477                         up_write( &current->mm->mmap_sem );
1478 #endif
1479                 } else {
1480 #if LINUX_VERSION_CODE <= 0x020402
1481                         down( &current->mm->mmap_sem );
1482 #else
1483                         down_write( &current->mm->mmap_sem );
1484 #endif
1485                         virtual = do_mmap( filp, 0, dma->byte_count,
1486                                            PROT_READ | PROT_WRITE,
1487                                            MAP_SHARED, 0 );
1488 #if LINUX_VERSION_CODE <= 0x020402
1489                         up( &current->mm->mmap_sem );
1490 #else
1491                         up_write( &current->mm->mmap_sem );
1492 #endif
1493                 }
1494                 if ( virtual > -1024UL ) {
1495                         /* Real error */
1496                         retcode = (signed long)virtual;
1497                         goto done;
1498                 }
1499                 request.virtual = (void __user *)virtual;
1500
1501                 for ( i = 0 ; i < dma->buf_count ; i++ ) {
1502                         if ( copy_to_user( &request.list[i].idx,
1503                                            &dma->buflist[i]->idx,
1504                                            sizeof(request.list[0].idx) ) ) {
1505                                 retcode = -EFAULT;
1506                                 goto done;
1507                         }
1508                         if ( copy_to_user( &request.list[i].total,
1509                                            &dma->buflist[i]->total,
1510                                            sizeof(request.list[0].total) ) ) {
1511                                 retcode = -EFAULT;
1512                                 goto done;
1513                         }
1514                         if ( copy_to_user( &request.list[i].used,
1515                                            &zero,
1516                                            sizeof(zero) ) ) {
1517                                 retcode = -EFAULT;
1518                                 goto done;
1519                         }
1520                         address = virtual + dma->buflist[i]->offset; /* *** */
1521                         if ( copy_to_user( &request.list[i].address,
1522                                            &address,
1523                                            sizeof(address) ) ) {
1524                                 retcode = -EFAULT;
1525                                 goto done;
1526                         }
1527                 }
1528         }
1529  done:
1530         request.count = dma->buf_count;
1531         DRM_DEBUG( "%d buffers, retcode = %d\n", request.count, retcode );
1532
1533         if ( copy_to_user( argp, &request, sizeof(request) ) )
1534                 return -EFAULT;
1535
1536         return retcode;
1537 }
1538
1539 /**
1540  * Compute size order.  Returns the exponent of the smaller power of two which
1541  * is greater or equal to given number.
1542  *
1543  * \param size size.
1544  * \return order.
1545  *
1546  * \todo Can be made faster.
1547  */
1548 int drm_order( unsigned long size )
1549 {
1550         int order;
1551         unsigned long tmp;
1552
1553         for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++)
1554                 ;
1555
1556         if (size & (size - 1))
1557                 ++order;
1558
1559         return order;
1560 }
1561 EXPORT_SYMBOL(drm_order);