drivers/char/drm/drm_vm.c

   1 /**
   2  * \file drm_vm.c
   3  * Memory mapping for DRM
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
  11  *
  12  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14  * All Rights Reserved.
  15  *
  16  * Permission is hereby granted, free of charge, to any person obtaining a
  17  * copy of this software and associated documentation files (the "Software"),
  18  * to deal in the Software without restriction, including without limitation
  19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20  * and/or sell copies of the Software, and to permit persons to whom the
  21  * Software is furnished to do so, subject to the following conditions:
  22  *
  23  * The above copyright notice and this permission notice (including the next
  24  * paragraph) shall be included in all copies or substantial portions of the
  25  * Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33  * OTHER DEALINGS IN THE SOFTWARE.
  34  */
  35
  36 #include "drmP.h"
  37 #if defined(__ia64__)
  38 #include <linux/efi.h>
  39 #endif
  40
  41 static void drm_vm_open(struct vm_area_struct *vma);
  42 static void drm_vm_close(struct vm_area_struct *vma);
  43
  44 static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
  45 {
  46         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  47
  48 #if defined(__i386__) || defined(__x86_64__)
  49         if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
  50                 pgprot_val(tmp) |= _PAGE_PCD;
  51                 pgprot_val(tmp) &= ~_PAGE_PWT;
  52         }
  53 #elif defined(__powerpc__)
  54         pgprot_val(tmp) |= _PAGE_NO_CACHE;
  55         if (map_type == _DRM_REGISTERS)
  56                 pgprot_val(tmp) |= _PAGE_GUARDED;
  57 #endif
  58 #if defined(__ia64__)
  59         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
  60                                     vma->vm_start))
  61                 tmp = pgprot_writecombine(tmp);
  62         else
  63                 tmp = pgprot_noncached(tmp);
  64 #endif
  65         return tmp;
  66 }
  67
  68 /**
  69  * \c nopage method for AGP virtual memory.
  70  *
  71  * \param vma virtual memory area.
  72  * \param address access address.
  73  * \return pointer to the page structure.
  74  *
  75  * Find the right map and if it's AGP memory find the real physical page to
  76  * map, get the page, increment the use count and return it.
  77  */
  78 #if __OS_HAS_AGP
  79 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
  80                                                 unsigned long address)
  81 {
  82         struct drm_file *priv = vma->vm_file->private_data;
  83         struct drm_device *dev = priv->head->dev;
  84         struct drm_map *map = NULL;
  85         struct drm_map_list *r_list;
  86         struct drm_hash_item *hash;
  87
  88         /*
  89          * Find the right map
  90          */
  91         if (!drm_core_has_AGP(dev))
  92                 goto vm_nopage_error;
  93
  94         if (!dev->agp || !dev->agp->cant_use_aperture)
  95                 goto vm_nopage_error;
  96
  97         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
  98                 goto vm_nopage_error;
  99
 100         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 101         map = r_list->map;
 102
 103         if (map && map->type == _DRM_AGP) {
 104                 unsigned long offset = address - vma->vm_start;
 105                 unsigned long baddr = map->offset + offset;
 106                 struct drm_agp_mem *agpmem;
 107                 struct page *page;
 108
 109 #ifdef __alpha__
 110                 /*
 111                  * Adjust to a bus-relative address
 112                  */
 113                 baddr -= dev->hose->mem_space->start;
 114 #endif
 115
 116                 /*
 117                  * It's AGP memory - find the real physical page to map
 118                  */
 119                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 120                         if (agpmem->bound <= baddr &&
 121                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 122                                 break;
 123                 }
 124
 125                 if (!agpmem)
 126                         goto vm_nopage_error;
 127
 128                 /*
 129                  * Get the page, inc the use count, and return it
 130                  */
 131                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 132                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
 133                 get_page(page);
 134
 135                 DRM_DEBUG
 136                     ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
 137                      baddr, __va(agpmem->memory->memory[offset]), offset,
 138                      page_count(page));
 139
 140                 return page;
 141         }
 142       vm_nopage_error:
 143         return NOPAGE_SIGBUS;   /* Disallow mremap */
 144 }
 145 #else                           /* __OS_HAS_AGP */
 146 static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
 147                                                 unsigned long address)
 148 {
 149         return NOPAGE_SIGBUS;
 150 }
 151 #endif                          /* __OS_HAS_AGP */
 152
 153 /**
 154  * \c nopage method for shared virtual memory.
 155  *
 156  * \param vma virtual memory area.
 157  * \param address access address.
 158  * \return pointer to the page structure.
 159  *
 160  * Get the mapping, find the real physical page to map, get the page, and
 161  * return it.
 162  */
 163 static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
 164                                                     unsigned long address)
 165 {
 166         struct drm_map *map = (struct drm_map *) vma->vm_private_data;
 167         unsigned long offset;
 168         unsigned long i;
 169         struct page *page;
 170
 171         if (address > vma->vm_end)
 172                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 173         if (!map)
 174                 return NOPAGE_SIGBUS;   /* Nothing allocated */
 175
 176         offset = address - vma->vm_start;
 177         i = (unsigned long)map->handle + offset;
 178         page = vmalloc_to_page((void *)i);
 179         if (!page)
 180                 return NOPAGE_SIGBUS;
 181         get_page(page);
 182
 183         DRM_DEBUG("shm_nopage 0x%lx\n", address);
 184         return page;
 185 }
 186
 187 /**
 188  * \c close method for shared virtual memory.
 189  *
 190  * \param vma virtual memory area.
 191  *
 192  * Deletes map information if we are the last
 193  * person to close a mapping and it's not in the global maplist.
 194  */
 195 static void drm_vm_shm_close(struct vm_area_struct *vma)
 196 {
 197         struct drm_file *priv = vma->vm_file->private_data;
 198         struct drm_device *dev = priv->head->dev;
 199         struct drm_vma_entry *pt, *temp;
 200         struct drm_map *map;
 201         struct drm_map_list *r_list;
 202         int found_maps = 0;
 203
 204         DRM_DEBUG("0x%08lx,0x%08lx\n",
 205                   vma->vm_start, vma->vm_end - vma->vm_start);
 206         atomic_dec(&dev->vma_count);
 207
 208         map = vma->vm_private_data;
 209
 210         mutex_lock(&dev->struct_mutex);
 211         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 212                 if (pt->vma->vm_private_data == map)
 213                         found_maps++;
 214                 if (pt->vma == vma) {
 215                         list_del(&pt->head);
 216                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 217                 }
 218         }
 219
 220         /* We were the only map that was found */
 221         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 222                 /* Check to see if we are in the maplist, if we are not, then
 223                  * we delete this mappings information.
 224                  */
 225                 found_maps = 0;
 226                 list_for_each_entry(r_list, &dev->maplist, head) {
 227                         if (r_list->map == map)
 228                                 found_maps++;
 229                 }
 230
 231                 if (!found_maps) {
 232                         drm_dma_handle_t dmah;
 233
 234                         switch (map->type) {
 235                         case _DRM_REGISTERS:
 236                         case _DRM_FRAME_BUFFER:
 237                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 238                                         int retcode;
 239                                         retcode = mtrr_del(map->mtrr,
 240                                                            map->offset,
 241                                                            map->size);
 242                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 243                                 }
 244                                 iounmap(map->handle);
 245                                 break;
 246                         case _DRM_SHM:
 247                                 vfree(map->handle);
 248                                 break;
 249                         case _DRM_AGP:
 250                         case _DRM_SCATTER_GATHER:
 251                                 break;
 252                         case _DRM_CONSISTENT:
 253                                 dmah.vaddr = map->handle;
 254                                 dmah.busaddr = map->offset;
 255                                 dmah.size = map->size;
 256                                 __drm_pci_free(dev, &dmah);
 257                                 break;
 258                         }
 259                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 260                 }
 261         }
 262         mutex_unlock(&dev->struct_mutex);
 263 }
 264
 265 /**
 266  * \c nopage method for DMA virtual memory.
 267  *
 268  * \param vma virtual memory area.
 269  * \param address access address.
 270  * \return pointer to the page structure.
 271  *
 272  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 273  */
 274 static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
 275                                                     unsigned long address)
 276 {
 277         struct drm_file *priv = vma->vm_file->private_data;
 278         struct drm_device *dev = priv->head->dev;
 279         struct drm_device_dma *dma = dev->dma;
 280         unsigned long offset;
 281         unsigned long page_nr;
 282         struct page *page;
 283
 284         if (!dma)
 285                 return NOPAGE_SIGBUS;   /* Error */
 286         if (address > vma->vm_end)
 287                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 288         if (!dma->pagelist)
 289                 return NOPAGE_SIGBUS;   /* Nothing allocated */
 290
 291         offset = address - vma->vm_start;       /* vm_[pg]off[set] should be 0 */
 292         page_nr = offset >> PAGE_SHIFT;
 293         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
 294
 295         get_page(page);
 296
 297         DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
 298         return page;
 299 }
 300
 301 /**
 302  * \c nopage method for scatter-gather virtual memory.
 303  *
 304  * \param vma virtual memory area.
 305  * \param address access address.
 306  * \return pointer to the page structure.
 307  *
 308  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 309  */
 310 static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
 311                                                    unsigned long address)
 312 {
 313         struct drm_map *map = (struct drm_map *) vma->vm_private_data;
 314         struct drm_file *priv = vma->vm_file->private_data;
 315         struct drm_device *dev = priv->head->dev;
 316         struct drm_sg_mem *entry = dev->sg;
 317         unsigned long offset;
 318         unsigned long map_offset;
 319         unsigned long page_offset;
 320         struct page *page;
 321
 322         if (!entry)
 323                 return NOPAGE_SIGBUS;   /* Error */
 324         if (address > vma->vm_end)
 325                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 326         if (!entry->pagelist)
 327                 return NOPAGE_SIGBUS;   /* Nothing allocated */
 328
 329         offset = address - vma->vm_start;
 330         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 331         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 332         page = entry->pagelist[page_offset];
 333         get_page(page);
 334
 335         return page;
 336 }
 337
 338 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
 339                                   unsigned long address, int *type)
 340 {
 341         if (type)
 342                 *type = VM_FAULT_MINOR;
 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, int *type)
 348 {
 349         if (type)
 350                 *type = VM_FAULT_MINOR;
 351         return drm_do_vm_shm_nopage(vma, address);
 352 }
 353
 354 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
 355                                       unsigned long address, int *type)
 356 {
 357         if (type)
 358                 *type = VM_FAULT_MINOR;
 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, int *type)
 364 {
 365         if (type)
 366                 *type = VM_FAULT_MINOR;
 367         return drm_do_vm_sg_nopage(vma, address);
 368 }
 369
 370 /** AGP virtual memory operations */
 371 static struct vm_operations_struct drm_vm_ops = {
 372         .nopage = drm_vm_nopage,
 373         .open = drm_vm_open,
 374         .close = drm_vm_close,
 375 };
 376
 377 /** Shared virtual memory operations */
 378 static struct vm_operations_struct drm_vm_shm_ops = {
 379         .nopage = drm_vm_shm_nopage,
 380         .open = drm_vm_open,
 381         .close = drm_vm_shm_close,
 382 };
 383
 384 /** DMA virtual memory operations */
 385 static struct vm_operations_struct drm_vm_dma_ops = {
 386         .nopage = drm_vm_dma_nopage,
 387         .open = drm_vm_open,
 388         .close = drm_vm_close,
 389 };
 390
 391 /** Scatter-gather virtual memory operations */
 392 static struct vm_operations_struct drm_vm_sg_ops = {
 393         .nopage = drm_vm_sg_nopage,
 394         .open = drm_vm_open,
 395         .close = drm_vm_close,
 396 };
 397
 398 /**
 399  * \c open method for shared virtual memory.
 400  *
 401  * \param vma virtual memory area.
 402  *
 403  * Create a new drm_vma_entry structure as the \p vma private data entry and
 404  * add it to drm_device::vmalist.
 405  */
 406 static void drm_vm_open_locked(struct vm_area_struct *vma)
 407 {
 408         struct drm_file *priv = vma->vm_file->private_data;
 409         struct drm_device *dev = priv->head->dev;
 410         struct drm_vma_entry *vma_entry;
 411
 412         DRM_DEBUG("0x%08lx,0x%08lx\n",
 413                   vma->vm_start, vma->vm_end - vma->vm_start);
 414         atomic_inc(&dev->vma_count);
 415
 416         vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
 417         if (vma_entry) {
 418                 vma_entry->vma = vma;
 419                 vma_entry->pid = current->pid;
 420                 list_add(&vma_entry->head, &dev->vmalist);
 421         }
 422 }
 423
 424 static void drm_vm_open(struct vm_area_struct *vma)
 425 {
 426         struct drm_file *priv = vma->vm_file->private_data;
 427         struct drm_device *dev = priv->head->dev;
 428
 429         mutex_lock(&dev->struct_mutex);
 430         drm_vm_open_locked(vma);
 431         mutex_unlock(&dev->struct_mutex);
 432 }
 433
 434 /**
 435  * \c close method for all virtual memory types.
 436  *
 437  * \param vma virtual memory area.
 438  *
 439  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 440  * free it.
 441  */
 442 static void drm_vm_close(struct vm_area_struct *vma)
 443 {
 444         struct drm_file *priv = vma->vm_file->private_data;
 445         struct drm_device *dev = priv->head->dev;
 446         struct drm_vma_entry *pt, *temp;
 447
 448         DRM_DEBUG("0x%08lx,0x%08lx\n",
 449                   vma->vm_start, vma->vm_end - vma->vm_start);
 450         atomic_dec(&dev->vma_count);
 451
 452         mutex_lock(&dev->struct_mutex);
 453         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 454                 if (pt->vma == vma) {
 455                         list_del(&pt->head);
 456                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 457                         break;
 458                 }
 459         }
 460         mutex_unlock(&dev->struct_mutex);
 461 }
 462
 463 /**
 464  * mmap DMA memory.
 465  *
 466  * \param file_priv DRM file private.
 467  * \param vma virtual memory area.
 468  * \return zero on success or a negative number on failure.
 469  *
 470  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 471  * pointer, and calls vm_open().
 472  */
 473 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 474 {
 475         struct drm_file *priv = filp->private_data;
 476         struct drm_device *dev;
 477         struct drm_device_dma *dma;
 478         unsigned long length = vma->vm_end - vma->vm_start;
 479
 480         dev = priv->head->dev;
 481         dma = dev->dma;
 482         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 483                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 484
 485         /* Length must match exact page count */
 486         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 487                 return -EINVAL;
 488         }
 489
 490         if (!capable(CAP_SYS_ADMIN) &&
 491             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 492                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 493 #if defined(__i386__) || defined(__x86_64__)
 494                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 495 #else
 496                 /* Ye gads this is ugly.  With more thought
 497                    we could move this up higher and use
 498                    `protection_map' instead.  */
 499                 vma->vm_page_prot =
 500                     __pgprot(pte_val
 501                              (pte_wrprotect
 502                               (__pte(pgprot_val(vma->vm_page_prot)))));
 503 #endif
 504         }
 505
 506         vma->vm_ops = &drm_vm_dma_ops;
 507
 508         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 509
 510         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 511         drm_vm_open_locked(vma);
 512         return 0;
 513 }
 514
 515 unsigned long drm_core_get_map_ofs(struct drm_map * map)
 516 {
 517         return map->offset;
 518 }
 519
 520 EXPORT_SYMBOL(drm_core_get_map_ofs);
 521
 522 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
 523 {
 524 #ifdef __alpha__
 525         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
 526 #else
 527         return 0;
 528 #endif
 529 }
 530
 531 EXPORT_SYMBOL(drm_core_get_reg_ofs);
 532
 533 /**
 534  * mmap DMA memory.
 535  *
 536  * \param file_priv DRM file private.
 537  * \param vma virtual memory area.
 538  * \return zero on success or a negative number on failure.
 539  *
 540  * If the virtual memory area has no offset associated with it then it's a DMA
 541  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 542  * checks that the restricted flag is not set, sets the virtual memory operations
 543  * according to the mapping type and remaps the pages. Finally sets the file
 544  * pointer and calls vm_open().
 545  */
 546 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 547 {
 548         struct drm_file *priv = filp->private_data;
 549         struct drm_device *dev = priv->head->dev;
 550         struct drm_map *map = NULL;
 551         unsigned long offset = 0;
 552         struct drm_hash_item *hash;
 553
 554         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 555                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 556
 557         if (!priv->authenticated)
 558                 return -EACCES;
 559
 560         /* We check for "dma". On Apple's UniNorth, it's valid to have
 561          * the AGP mapped at physical address 0
 562          * --BenH.
 563          */
 564         if (!vma->vm_pgoff
 565 #if __OS_HAS_AGP
 566             && (!dev->agp
 567                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 568 #endif
 569             )
 570                 return drm_mmap_dma(filp, vma);
 571
 572         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 573                 DRM_ERROR("Could not find map\n");
 574                 return -EINVAL;
 575         }
 576
 577         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 578         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 579                 return -EPERM;
 580
 581         /* Check for valid size. */
 582         if (map->size < vma->vm_end - vma->vm_start)
 583                 return -EINVAL;
 584
 585         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 586                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 587 #if defined(__i386__) || defined(__x86_64__)
 588                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 589 #else
 590                 /* Ye gads this is ugly.  With more thought
 591                    we could move this up higher and use
 592                    `protection_map' instead.  */
 593                 vma->vm_page_prot =
 594                     __pgprot(pte_val
 595                              (pte_wrprotect
 596                               (__pte(pgprot_val(vma->vm_page_prot)))));
 597 #endif
 598         }
 599
 600         switch (map->type) {
 601         case _DRM_AGP:
 602                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
 603                         /*
 604                          * On some platforms we can't talk to bus dma address from the CPU, so for
 605                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 606                          * pages and mappings in nopage()
 607                          */
 608 #if defined(__powerpc__)
 609                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 610 #endif
 611                         vma->vm_ops = &drm_vm_ops;
 612                         break;
 613                 }
 614                 /* fall through to _DRM_FRAME_BUFFER... */
 615         case _DRM_FRAME_BUFFER:
 616         case _DRM_REGISTERS:
 617                 offset = dev->driver->get_reg_ofs(dev);
 618                 vma->vm_flags |= VM_IO; /* not in core dump */
 619                 vma->vm_page_prot = drm_io_prot(map->type, vma);
 620 #ifdef __sparc__
 621                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 622 #endif
 623                 if (io_remap_pfn_range(vma, vma->vm_start,
 624                                        (map->offset + offset) >> PAGE_SHIFT,
 625                                        vma->vm_end - vma->vm_start,
 626                                        vma->vm_page_prot))
 627                         return -EAGAIN;
 628                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 629                           " offset = 0x%lx\n",
 630                           map->type,
 631                           vma->vm_start, vma->vm_end, map->offset + offset);
 632                 vma->vm_ops = &drm_vm_ops;
 633                 break;
 634         case _DRM_CONSISTENT:
 635                 /* Consistent memory is really like shared memory. But
 636                  * it's allocated in a different way, so avoid nopage */
 637                 if (remap_pfn_range(vma, vma->vm_start,
 638                     page_to_pfn(virt_to_page(map->handle)),
 639                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 640                         return -EAGAIN;
 641         /* fall through to _DRM_SHM */
 642         case _DRM_SHM:
 643                 vma->vm_ops = &drm_vm_shm_ops;
 644                 vma->vm_private_data = (void *)map;
 645                 /* Don't let this area swap.  Change when
 646                    DRM_KERNEL advisory is supported. */
 647                 vma->vm_flags |= VM_RESERVED;
 648                 break;
 649         case _DRM_SCATTER_GATHER:
 650                 vma->vm_ops = &drm_vm_sg_ops;
 651                 vma->vm_private_data = (void *)map;
 652                 vma->vm_flags |= VM_RESERVED;
 653                 break;
 654         default:
 655                 return -EINVAL; /* This should never happen. */
 656         }
 657         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 658
 659         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 660         drm_vm_open_locked(vma);
 661         return 0;
 662 }
 663
 664 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 665 {
 666         struct drm_file *priv = filp->private_data;
 667         struct drm_device *dev = priv->head->dev;
 668         int ret;
 669
 670         mutex_lock(&dev->struct_mutex);
 671         ret = drm_mmap_locked(filp, vma);
 672         mutex_unlock(&dev->struct_mutex);
 673
 674         return ret;
 675 }
 676 EXPORT_SYMBOL(drm_mmap);