linux-core/drm_vm.c

   1 /**
   2  * \file drm_vm.c
   3  * Memory mapping for DRM
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
  11  *
  12  * Copyright 1999 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 "drmP.h"
  37 #if defined(__ia64__)
  38 #include <linux/efi.h>
  39 #endif
  40
  41 static void drm_vm_open(struct vm_area_struct *vma);
  42 static void drm_vm_close(struct vm_area_struct *vma);
  43
  44 /**
  45  * \c nopage method for AGP virtual memory.
  46  *
  47  * \param vma virtual memory area.
  48  * \param address access address.
  49  * \return pointer to the page structure.
  50  *
  51  * Find the right map and if it's AGP memory find the real physical page to
  52  * map, get the page, increment the use count and return it.
  53  */
  54 #if __OS_HAS_AGP
  55 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
  56                                                 unsigned long address)
  57 {
  58         drm_file_t *priv = vma->vm_file->private_data;
  59         drm_device_t *dev = priv->head->dev;
  60         drm_map_t *map = NULL;
  61         drm_map_list_t *r_list;
  62         drm_hash_item_t *hash;
  63
  64         /*
  65          * Find the right map
  66          */
  67         if (!drm_core_has_AGP(dev))
  68                 goto vm_nopage_error;
  69
  70         if (!dev->agp || !dev->agp->cant_use_aperture)
  71                 goto vm_nopage_error;
  72
  73         if (drm_ht_find_item(&dev->map_hash, VM_OFFSET(vma), &hash))
  74                 goto vm_nopage_error;
  75
  76         r_list = drm_hash_entry(hash, drm_map_list_t, hash);
  77         map = r_list->map;
  78
  79         if (map && map->type == _DRM_AGP) {
  80                 unsigned long offset = address - vma->vm_start;
  81                 unsigned long baddr = map->offset + offset;
  82                 struct drm_agp_mem *agpmem;
  83                 struct page *page;
  84
  85 #ifdef __alpha__
  86                 /*
  87                  * Adjust to a bus-relative address
  88                  */
  89                 baddr -= dev->hose->mem_space->start;
  90 #endif
  91
  92                 /*
  93                  * It's AGP memory - find the real physical page to map
  94                  */
  95                 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
  96                         if (agpmem->bound <= baddr &&
  97                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
  98                                 break;
  99                 }
 100
 101                 if (!agpmem)
 102                         goto vm_nopage_error;
 103
 104                 /*
 105                  * Get the page, inc the use count, and return it
 106                  */
 107                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 108                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
 109                 get_page(page);
 110
 111 #if 0
 112                 /* page_count() not defined everywhere */
 113                 DRM_DEBUG
 114                     ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
 115                      baddr, __va(agpmem->memory->memory[offset]), offset,
 116                      page_count(page));
 117 #endif
 118
 119                 return page;
 120         }
 121       vm_nopage_error:
 122         return NOPAGE_SIGBUS;   /* Disallow mremap */
 123 }
 124 #else                           /* __OS_HAS_AGP */
 125 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
 126                                                 unsigned long address)
 127 {
 128         return NOPAGE_SIGBUS;
 129 }
 130 #endif                          /* __OS_HAS_AGP */
 131
 132 /**
 133  * \c nopage method for shared virtual memory.
 134  *
 135  * \param vma virtual memory area.
 136  * \param address access address.
 137  * \return pointer to the page structure.
 138  *
 139  * Get the the mapping, find the real physical page to map, get the page, and
 140  * return it.
 141  */
 142 static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
 143                                                     unsigned long address)
 144 {
 145         drm_map_t *map = (drm_map_t *) vma->vm_private_data;
 146         unsigned long offset;
 147         unsigned long i;
 148         struct page *page;
 149
 150         if (address > vma->vm_end)
 151                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 152         if (!map)
 153                 return NOPAGE_OOM;      /* Nothing allocated */
 154
 155         offset = address - vma->vm_start;
 156         i = (unsigned long)map->handle + offset;
 157         page = vmalloc_to_page((void *)i);
 158         if (!page)
 159                 return NOPAGE_OOM;
 160         get_page(page);
 161
 162         DRM_DEBUG("shm_nopage 0x%lx\n", address);
 163         return page;
 164 }
 165
 166 /**
 167  * \c close method for shared virtual memory.
 168  *
 169  * \param vma virtual memory area.
 170  *
 171  * Deletes map information if we are the last
 172  * person to close a mapping and it's not in the global maplist.
 173  */
 174 static void drm_vm_shm_close(struct vm_area_struct *vma)
 175 {
 176         drm_file_t *priv = vma->vm_file->private_data;
 177         drm_device_t *dev = priv->head->dev;
 178         drm_vma_entry_t *pt, *prev, *next;
 179         drm_map_t *map;
 180         drm_map_list_t *r_list;
 181         struct list_head *list;
 182         int found_maps = 0;
 183
 184         DRM_DEBUG("0x%08lx,0x%08lx\n",
 185                   vma->vm_start, vma->vm_end - vma->vm_start);
 186         atomic_dec(&dev->vma_count);
 187
 188         map = vma->vm_private_data;
 189
 190         down(&dev->struct_sem);
 191         for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
 192                 next = pt->next;
 193                 if (pt->vma->vm_private_data == map)
 194                         found_maps++;
 195                 if (pt->vma == vma) {
 196                         if (prev) {
 197                                 prev->next = pt->next;
 198                         } else {
 199                                 dev->vmalist = pt->next;
 200                         }
 201                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 202                 } else {
 203                         prev = pt;
 204                 }
 205         }
 206         /* We were the only map that was found */
 207         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 208                 /* Check to see if we are in the maplist, if we are not, then
 209                  * we delete this mappings information.
 210                  */
 211                 found_maps = 0;
 212                 list = &dev->maplist->head;
 213                 list_for_each(list, &dev->maplist->head) {
 214                         r_list = list_entry(list, drm_map_list_t, head);
 215                         if (r_list->map == map)
 216                                 found_maps++;
 217                 }
 218
 219                 if (!found_maps) {
 220                         drm_dma_handle_t dmah;
 221
 222                         switch (map->type) {
 223                         case _DRM_REGISTERS:
 224                         case _DRM_FRAME_BUFFER:
 225                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 226                                         int retcode;
 227                                         retcode = mtrr_del(map->mtrr,
 228                                                            map->offset,
 229                                                            map->size);
 230                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 231                                 }
 232                                 drm_ioremapfree(map->handle, map->size, dev);
 233                                 break;
 234                         case _DRM_SHM:
 235                                 vfree(map->handle);
 236                                 break;
 237                         case _DRM_AGP:
 238                         case _DRM_SCATTER_GATHER:
 239                                 break;
 240                         case _DRM_CONSISTENT:
 241                                 dmah.vaddr = map->handle;
 242                                 dmah.busaddr = map->offset;
 243                                 dmah.size = map->size;
 244                                 __drm_pci_free(dev, &dmah);
 245                                 break;
 246                         }
 247                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 248                 }
 249         }
 250         up(&dev->struct_sem);
 251 }
 252
 253 /**
 254  * \c nopage method for DMA virtual memory.
 255  *
 256  * \param vma virtual memory area.
 257  * \param address access address.
 258  * \return pointer to the page structure.
 259  *
 260  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 261  */
 262 static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
 263                                                     unsigned long address)
 264 {
 265         drm_file_t *priv = vma->vm_file->private_data;
 266         drm_device_t *dev = priv->head->dev;
 267         drm_device_dma_t *dma = dev->dma;
 268         unsigned long offset;
 269         unsigned long page_nr;
 270         struct page *page;
 271
 272         if (!dma)
 273                 return NOPAGE_SIGBUS;   /* Error */
 274         if (address > vma->vm_end)
 275                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 276         if (!dma->pagelist)
 277                 return NOPAGE_OOM;      /* Nothing allocated */
 278
 279         offset = address - vma->vm_start;       /* vm_[pg]off[set] should be 0 */
 280         page_nr = offset >> PAGE_SHIFT;
 281         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
 282
 283         get_page(page);
 284
 285         DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
 286         return page;
 287 }
 288
 289 /**
 290  * \c nopage method for scatter-gather virtual memory.
 291  *
 292  * \param vma virtual memory area.
 293  * \param address access address.
 294  * \return pointer to the page structure.
 295  *
 296  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 297  */
 298 static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
 299                                                    unsigned long address)
 300 {
 301         drm_map_t *map = (drm_map_t *) vma->vm_private_data;
 302         drm_file_t *priv = vma->vm_file->private_data;
 303         drm_device_t *dev = priv->head->dev;
 304         drm_sg_mem_t *entry = dev->sg;
 305         unsigned long offset;
 306         unsigned long map_offset;
 307         unsigned long page_offset;
 308         struct page *page;
 309
 310         DRM_DEBUG("\n");
 311         if (!entry)
 312                 return NOPAGE_SIGBUS;   /* Error */
 313         if (address > vma->vm_end)
 314                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 315         if (!entry->pagelist)
 316                 return NOPAGE_OOM;      /* Nothing allocated */
 317
 318         offset = address - vma->vm_start;
 319         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 320         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 321         page = entry->pagelist[page_offset];
 322         get_page(page);
 323
 324         return page;
 325 }
 326
 327 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
 328
 329 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
 330                                   unsigned long address, int *type)
 331 {
 332         if (type)
 333                 *type = VM_FAULT_MINOR;
 334         return drm_do_vm_nopage(vma, address);
 335 }
 336
 337 static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
 338                                       unsigned long address, int *type)
 339 {
 340         if (type)
 341                 *type = VM_FAULT_MINOR;
 342         return drm_do_vm_shm_nopage(vma, address);
 343 }
 344
 345 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
 346                                       unsigned long address, int *type)
 347 {
 348         if (type)
 349                 *type = VM_FAULT_MINOR;
 350         return drm_do_vm_dma_nopage(vma, address);
 351 }
 352
 353 static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
 354                                      unsigned long address, int *type)
 355 {
 356         if (type)
 357                 *type = VM_FAULT_MINOR;
 358         return drm_do_vm_sg_nopage(vma, address);
 359 }
 360
 361 #else                           /* LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) */
 362
 363 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
 364                                   unsigned long address, int unused)
 365 {
 366         return drm_do_vm_nopage(vma, address);
 367 }
 368
 369 static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
 370                                       unsigned long address, int unused)
 371 {
 372         return drm_do_vm_shm_nopage(vma, address);
 373 }
 374
 375 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
 376                                       unsigned long address, int unused)
 377 {
 378         return drm_do_vm_dma_nopage(vma, address);
 379 }
 380
 381 static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
 382                                      unsigned long address, int unused)
 383 {
 384         return drm_do_vm_sg_nopage(vma, address);
 385 }
 386
 387 #endif
 388
 389 /** AGP virtual memory operations */
 390 static struct vm_operations_struct drm_vm_ops = {
 391         .nopage = drm_vm_nopage,
 392         .open = drm_vm_open,
 393         .close = drm_vm_close,
 394 };
 395
 396 /** Shared virtual memory operations */
 397 static struct vm_operations_struct drm_vm_shm_ops = {
 398         .nopage = drm_vm_shm_nopage,
 399         .open = drm_vm_open,
 400         .close = drm_vm_shm_close,
 401 };
 402
 403 /** DMA virtual memory operations */
 404 static struct vm_operations_struct drm_vm_dma_ops = {
 405         .nopage = drm_vm_dma_nopage,
 406         .open = drm_vm_open,
 407         .close = drm_vm_close,
 408 };
 409
 410 /** Scatter-gather virtual memory operations */
 411 static struct vm_operations_struct drm_vm_sg_ops = {
 412         .nopage = drm_vm_sg_nopage,
 413         .open = drm_vm_open,
 414         .close = drm_vm_close,
 415 };
 416
 417 /**
 418  * \c open method for shared virtual memory.
 419  *
 420  * \param vma virtual memory area.
 421  *
 422  * Create a new drm_vma_entry structure as the \p vma private data entry and
 423  * add it to drm_device::vmalist.
 424  */
 425 static void drm_vm_open(struct vm_area_struct *vma)
 426 {
 427         drm_file_t *priv = vma->vm_file->private_data;
 428         drm_device_t *dev = priv->head->dev;
 429         drm_vma_entry_t *vma_entry;
 430
 431         DRM_DEBUG("0x%08lx,0x%08lx\n",
 432                   vma->vm_start, vma->vm_end - vma->vm_start);
 433         atomic_inc(&dev->vma_count);
 434
 435         vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
 436         if (vma_entry) {
 437                 down(&dev->struct_sem);
 438                 vma_entry->vma = vma;
 439                 vma_entry->next = dev->vmalist;
 440                 vma_entry->pid = current->pid;
 441                 dev->vmalist = vma_entry;
 442                 up(&dev->struct_sem);
 443         }
 444 }
 445
 446 /**
 447  * \c close method for all virtual memory types.
 448  *
 449  * \param vma virtual memory area.
 450  *
 451  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 452  * free it.
 453  */
 454 static void drm_vm_close(struct vm_area_struct *vma)
 455 {
 456         drm_file_t *priv = vma->vm_file->private_data;
 457         drm_device_t *dev = priv->head->dev;
 458         drm_vma_entry_t *pt, *prev;
 459
 460         DRM_DEBUG("0x%08lx,0x%08lx\n",
 461                   vma->vm_start, vma->vm_end - vma->vm_start);
 462         atomic_dec(&dev->vma_count);
 463
 464         down(&dev->struct_sem);
 465         for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
 466                 if (pt->vma == vma) {
 467                         if (prev) {
 468                                 prev->next = pt->next;
 469                         } else {
 470                                 dev->vmalist = pt->next;
 471                         }
 472                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 473                         break;
 474                 }
 475         }
 476         up(&dev->struct_sem);
 477 }
 478
 479 /**
 480  * mmap DMA memory.
 481  *
 482  * \param filp file pointer.
 483  * \param vma virtual memory area.
 484  * \return zero on success or a negative number on failure.
 485  *
 486  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 487  * pointer, and calls vm_open().
 488  */
 489 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 490 {
 491         drm_file_t *priv = filp->private_data;
 492         drm_device_t *dev;
 493         drm_device_dma_t *dma;
 494         unsigned long length = vma->vm_end - vma->vm_start;
 495
 496         lock_kernel();
 497         dev = priv->head->dev;
 498         dma = dev->dma;
 499         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
 500                   vma->vm_start, vma->vm_end, VM_OFFSET(vma));
 501
 502         /* Length must match exact page count */
 503         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 504                 unlock_kernel();
 505                 return -EINVAL;
 506         }
 507         unlock_kernel();
 508
 509         vma->vm_ops = &drm_vm_dma_ops;
 510
 511 #if LINUX_VERSION_CODE <= 0x02040e      /* KERNEL_VERSION(2,4,14) */
 512         vma->vm_flags |= VM_LOCKED | VM_SHM;    /* Don't swap */
 513 #else
 514         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 515 #endif
 516
 517         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 518         drm_vm_open(vma);
 519         return 0;
 520 }
 521
 522 unsigned long drm_core_get_map_ofs(drm_map_t * map)
 523 {
 524         return map->offset;
 525 }
 526 EXPORT_SYMBOL(drm_core_get_map_ofs);
 527
 528 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
 529 {
 530 #ifdef __alpha__
 531         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
 532 #else
 533         return 0;
 534 #endif
 535 }
 536 EXPORT_SYMBOL(drm_core_get_reg_ofs);
 537
 538 /**
 539  * mmap DMA memory.
 540  *
 541  * \param filp file pointer.
 542  * \param vma virtual memory area.
 543  * \return zero on success or a negative number on failure.
 544  *
 545  * If the virtual memory area has no offset associated with it then it's a DMA
 546  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 547  * checks that the restricted flag is not set, sets the virtual memory operations
 548  * according to the mapping type and remaps the pages. Finally sets the file
 549  * pointer and calls vm_open().
 550  */
 551 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 552 {
 553         drm_file_t *priv = filp->private_data;
 554         drm_device_t *dev = priv->head->dev;
 555         drm_map_t *map = NULL;
 556         unsigned long offset = 0;
 557         drm_hash_item_t *hash;
 558
 559         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
 560                   vma->vm_start, vma->vm_end, VM_OFFSET(vma));
 561
 562         if (!priv->authenticated)
 563                 return -EACCES;
 564
 565         /* We check for "dma". On Apple's UniNorth, it's valid to have
 566          * the AGP mapped at physical address 0
 567          * --BenH.
 568          */
 569         if (!VM_OFFSET(vma)
 570 #if __OS_HAS_AGP
 571             && (!dev->agp
 572                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 573 #endif
 574             )
 575                 return drm_mmap_dma(filp, vma);
 576
 577         if (drm_ht_find_item(&dev->map_hash, VM_OFFSET(vma), &hash)) {
 578                 DRM_ERROR("Could not find map\n");
 579                 return -EINVAL;
 580         }
 581
 582         map = drm_hash_entry(hash,drm_map_list_t, hash)->map;
 583
 584         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 585                 return -EPERM;
 586
 587         /* Check for valid size. */
 588         if (map->size < vma->vm_end - vma->vm_start)
 589                 return -EINVAL;
 590
 591         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 592                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 593 #if defined(__i386__) || defined(__x86_64__)
 594                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 595 #else
 596                 /* Ye gads this is ugly.  With more thought
 597                    we could move this up higher and use
 598                    `protection_map' instead.  */
 599                 vma->vm_page_prot =
 600                     __pgprot(pte_val
 601                              (pte_wrprotect
 602                               (__pte(pgprot_val(vma->vm_page_prot)))));
 603 #endif
 604         }
 605
 606         switch (map->type) {
 607         case _DRM_AGP:
 608                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
 609                         /*
 610                          * On some platforms we can't talk to bus dma address from the CPU, so for
 611                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 612                          * pages and mappings in nopage()
 613                          */
 614 #if defined(__powerpc__)
 615                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 616 #endif
 617                         vma->vm_ops = &drm_vm_ops;
 618                         break;
 619                 }
 620                 /* fall through to _DRM_FRAME_BUFFER... */
 621         case _DRM_FRAME_BUFFER:
 622         case _DRM_REGISTERS:
 623 #if defined(__i386__) || defined(__x86_64__)
 624                 if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
 625                         pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 626                         pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
 627                 }
 628 #elif defined(__powerpc__)
 629                 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 630                 if (map->type == _DRM_REGISTERS)
 631                         pgprot_val(vma->vm_page_prot) |= _PAGE_GUARDED;
 632 #endif
 633                 vma->vm_flags |= VM_IO; /* not in core dump */
 634 #if defined(__ia64__)
 635                 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
 636                                     vma->vm_start))
 637                         vma->vm_page_prot =
 638                                 pgprot_writecombine(vma->vm_page_prot);
 639                 else
 640                         vma->vm_page_prot =
 641                                 pgprot_noncached(vma->vm_page_prot);
 642 #endif
 643                 offset = dev->driver->get_reg_ofs(dev);
 644 #ifdef __sparc__
 645                 if (io_remap_pfn_range(vma, vma->vm_start,
 646                                         (map->offset + offset) >>PAGE_SHIFT,
 647                                         vma->vm_end - vma->vm_start,
 648                                         vma->vm_page_prot))
 649 #else
 650                 if (remap_pfn_range(vma, vma->vm_start,
 651                                      (map->offset + offset) >> PAGE_SHIFT,
 652                                      vma->vm_end - vma->vm_start,
 653                                      vma->vm_page_prot))
 654 #endif
 655                         return -EAGAIN;
 656                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 657                           " offset = 0x%lx\n",
 658                           map->type,
 659                           vma->vm_start, vma->vm_end, map->offset + offset);
 660                 vma->vm_ops = &drm_vm_ops;
 661                 break;
 662         case _DRM_CONSISTENT:
 663                 /* Consistent memory is really like shared memory. But
 664                  * it's allocated in a different way, so avoid nopage */
 665                 if (remap_pfn_range(vma, vma->vm_start,
 666                     page_to_pfn(virt_to_page(map->handle)),
 667                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 668                         return -EAGAIN;
 669         /* fall through to _DRM_SHM */
 670         case _DRM_SHM:
 671                 vma->vm_ops = &drm_vm_shm_ops;
 672                 vma->vm_private_data = (void *)map;
 673                 /* Don't let this area swap.  Change when
 674                    DRM_KERNEL advisory is supported. */
 675 #if LINUX_VERSION_CODE <= 0x02040e      /* KERNEL_VERSION(2,4,14) */
 676                 vma->vm_flags |= VM_LOCKED;
 677 #else
 678                 vma->vm_flags |= VM_RESERVED;
 679 #endif
 680                 break;
 681         case _DRM_SCATTER_GATHER:
 682                 vma->vm_ops = &drm_vm_sg_ops;
 683                 vma->vm_private_data = (void *)map;
 684 #if LINUX_VERSION_CODE <= 0x02040e      /* KERNEL_VERSION(2,4,14) */
 685                 vma->vm_flags |= VM_LOCKED;
 686 #else
 687                 vma->vm_flags |= VM_RESERVED;
 688 #endif
 689                 break;
 690         default:
 691                 return -EINVAL; /* This should never happen. */
 692         }
 693 #if LINUX_VERSION_CODE <= 0x02040e      /* KERNEL_VERSION(2,4,14) */
 694         vma->vm_flags |= VM_LOCKED | VM_SHM;    /* Don't swap */
 695 #else
 696         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 697 #endif
 698
 699         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 700         drm_vm_open(vma);
 701         return 0;
 702 }
 703 EXPORT_SYMBOL(drm_mmap);