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