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