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