git.oblomov.eu Git - linux-2.6/blob - drivers/char/drm/drm_vm.c

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