drivers/gpu/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 <drm/drmP.h>
  37 #include <linux/export.h>
  38 #if defined(__ia64__)
  39 #include <linux/efi.h>
  40 #include <linux/slab.h>
  41 #endif
  42
  43 static void drm_vm_open(struct vm_area_struct *vma);
  44 static void drm_vm_close(struct vm_area_struct *vma);
  45
  46 static pgprot_t drm_io_prot(struct drm_local_map *map,
  47                             struct vm_area_struct *vma)
  48 {
  49         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  50
  51 #if defined(__i386__) || defined(__x86_64__)
  52         if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
  53                 tmp = pgprot_noncached(tmp);
  54         else
  55                 tmp = pgprot_writecombine(tmp);
  56 #elif defined(__powerpc__)
  57         pgprot_val(tmp) |= _PAGE_NO_CACHE;
  58         if (map->type == _DRM_REGISTERS)
  59                 pgprot_val(tmp) |= _PAGE_GUARDED;
  60 #elif defined(__ia64__)
  61         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
  62                                     vma->vm_start))
  63                 tmp = pgprot_writecombine(tmp);
  64         else
  65                 tmp = pgprot_noncached(tmp);
  66 #elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
  67         tmp = pgprot_noncached(tmp);
  68 #endif
  69         return tmp;
  70 }
  71
  72 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  73 {
  74         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  75
  76 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
  77         tmp |= _PAGE_NO_CACHE;
  78 #endif
  79         return tmp;
  80 }
  81
  82 /**
  83  * \c fault method for AGP virtual memory.
  84  *
  85  * \param vma virtual memory area.
  86  * \param address access address.
  87  * \return pointer to the page structure.
  88  *
  89  * Find the right map and if it's AGP memory find the real physical page to
  90  * map, get the page, increment the use count and return it.
  91  */
  92 #if __OS_HAS_AGP
  93 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  94 {
  95         struct drm_file *priv = vma->vm_file->private_data;
  96         struct drm_device *dev = priv->minor->dev;
  97         struct drm_local_map *map = NULL;
  98         struct drm_map_list *r_list;
  99         struct drm_hash_item *hash;
 100
 101         /*
 102          * Find the right map
 103          */
 104         if (!drm_core_has_AGP(dev))
 105                 goto vm_fault_error;
 106
 107         if (!dev->agp || !dev->agp->cant_use_aperture)
 108                 goto vm_fault_error;
 109
 110         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
 111                 goto vm_fault_error;
 112
 113         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 114         map = r_list->map;
 115
 116         if (map && map->type == _DRM_AGP) {
 117                 /*
 118                  * Using vm_pgoff as a selector forces us to use this unusual
 119                  * addressing scheme.
 120                  */
 121                 resource_size_t offset = (unsigned long)vmf->virtual_address -
 122                         vma->vm_start;
 123                 resource_size_t baddr = map->offset + offset;
 124                 struct drm_agp_mem *agpmem;
 125                 struct page *page;
 126
 127 #ifdef __alpha__
 128                 /*
 129                  * Adjust to a bus-relative address
 130                  */
 131                 baddr -= dev->hose->mem_space->start;
 132 #endif
 133
 134                 /*
 135                  * It's AGP memory - find the real physical page to map
 136                  */
 137                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 138                         if (agpmem->bound <= baddr &&
 139                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 140                                 break;
 141                 }
 142
 143                 if (&agpmem->head == &dev->agp->memory)
 144                         goto vm_fault_error;
 145
 146                 /*
 147                  * Get the page, inc the use count, and return it
 148                  */
 149                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 150                 page = agpmem->memory->pages[offset];
 151                 get_page(page);
 152                 vmf->page = page;
 153
 154                 DRM_DEBUG
 155                     ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
 156                      (unsigned long long)baddr,
 157                      agpmem->memory->pages[offset],
 158                      (unsigned long long)offset,
 159                      page_count(page));
 160                 return 0;
 161         }
 162 vm_fault_error:
 163         return VM_FAULT_SIGBUS; /* Disallow mremap */
 164 }
 165 #else                           /* __OS_HAS_AGP */
 166 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 167 {
 168         return VM_FAULT_SIGBUS;
 169 }
 170 #endif                          /* __OS_HAS_AGP */
 171
 172 /**
 173  * \c nopage method for shared virtual memory.
 174  *
 175  * \param vma virtual memory area.
 176  * \param address access address.
 177  * \return pointer to the page structure.
 178  *
 179  * Get the mapping, find the real physical page to map, get the page, and
 180  * return it.
 181  */
 182 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 183 {
 184         struct drm_local_map *map = vma->vm_private_data;
 185         unsigned long offset;
 186         unsigned long i;
 187         struct page *page;
 188
 189         if (!map)
 190                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 191
 192         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 193         i = (unsigned long)map->handle + offset;
 194         page = vmalloc_to_page((void *)i);
 195         if (!page)
 196                 return VM_FAULT_SIGBUS;
 197         get_page(page);
 198         vmf->page = page;
 199
 200         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 201         return 0;
 202 }
 203
 204 /**
 205  * \c close method for shared virtual memory.
 206  *
 207  * \param vma virtual memory area.
 208  *
 209  * Deletes map information if we are the last
 210  * person to close a mapping and it's not in the global maplist.
 211  */
 212 static void drm_vm_shm_close(struct vm_area_struct *vma)
 213 {
 214         struct drm_file *priv = vma->vm_file->private_data;
 215         struct drm_device *dev = priv->minor->dev;
 216         struct drm_vma_entry *pt, *temp;
 217         struct drm_local_map *map;
 218         struct drm_map_list *r_list;
 219         int found_maps = 0;
 220
 221         DRM_DEBUG("0x%08lx,0x%08lx\n",
 222                   vma->vm_start, vma->vm_end - vma->vm_start);
 223         atomic_dec(&dev->vma_count);
 224
 225         map = vma->vm_private_data;
 226
 227         mutex_lock(&dev->struct_mutex);
 228         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 229                 if (pt->vma->vm_private_data == map)
 230                         found_maps++;
 231                 if (pt->vma == vma) {
 232                         list_del(&pt->head);
 233                         kfree(pt);
 234                 }
 235         }
 236
 237         /* We were the only map that was found */
 238         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 239                 /* Check to see if we are in the maplist, if we are not, then
 240                  * we delete this mappings information.
 241                  */
 242                 found_maps = 0;
 243                 list_for_each_entry(r_list, &dev->maplist, head) {
 244                         if (r_list->map == map)
 245                                 found_maps++;
 246                 }
 247
 248                 if (!found_maps) {
 249                         drm_dma_handle_t dmah;
 250
 251                         switch (map->type) {
 252                         case _DRM_REGISTERS:
 253                         case _DRM_FRAME_BUFFER:
 254                                 if (drm_core_has_MTRR(dev))
 255                                         arch_phys_wc_del(map->mtrr);
 256                                 iounmap(map->handle);
 257                                 break;
 258                         case _DRM_SHM:
 259                                 vfree(map->handle);
 260                                 break;
 261                         case _DRM_AGP:
 262                         case _DRM_SCATTER_GATHER:
 263                                 break;
 264                         case _DRM_CONSISTENT:
 265                                 dmah.vaddr = map->handle;
 266                                 dmah.busaddr = map->offset;
 267                                 dmah.size = map->size;
 268                                 __drm_pci_free(dev, &dmah);
 269                                 break;
 270                         case _DRM_GEM:
 271                                 DRM_ERROR("tried to rmmap GEM object\n");
 272                                 break;
 273                         }
 274                         kfree(map);
 275                 }
 276         }
 277         mutex_unlock(&dev->struct_mutex);
 278 }
 279
 280 /**
 281  * \c fault method for DMA virtual memory.
 282  *
 283  * \param vma virtual memory area.
 284  * \param address access address.
 285  * \return pointer to the page structure.
 286  *
 287  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 288  */
 289 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 290 {
 291         struct drm_file *priv = vma->vm_file->private_data;
 292         struct drm_device *dev = priv->minor->dev;
 293         struct drm_device_dma *dma = dev->dma;
 294         unsigned long offset;
 295         unsigned long page_nr;
 296         struct page *page;
 297
 298         if (!dma)
 299                 return VM_FAULT_SIGBUS; /* Error */
 300         if (!dma->pagelist)
 301                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 302
 303         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
 304         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 305         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
 306
 307         get_page(page);
 308         vmf->page = page;
 309
 310         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 311         return 0;
 312 }
 313
 314 /**
 315  * \c fault method for scatter-gather virtual memory.
 316  *
 317  * \param vma virtual memory area.
 318  * \param address access address.
 319  * \return pointer to the page structure.
 320  *
 321  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 322  */
 323 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 324 {
 325         struct drm_local_map *map = vma->vm_private_data;
 326         struct drm_file *priv = vma->vm_file->private_data;
 327         struct drm_device *dev = priv->minor->dev;
 328         struct drm_sg_mem *entry = dev->sg;
 329         unsigned long offset;
 330         unsigned long map_offset;
 331         unsigned long page_offset;
 332         struct page *page;
 333
 334         if (!entry)
 335                 return VM_FAULT_SIGBUS; /* Error */
 336         if (!entry->pagelist)
 337                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 338
 339         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 340         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 341         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 342         page = entry->pagelist[page_offset];
 343         get_page(page);
 344         vmf->page = page;
 345
 346         return 0;
 347 }
 348
 349 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 350 {
 351         return drm_do_vm_fault(vma, vmf);
 352 }
 353
 354 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 355 {
 356         return drm_do_vm_shm_fault(vma, vmf);
 357 }
 358
 359 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 360 {
 361         return drm_do_vm_dma_fault(vma, vmf);
 362 }
 363
 364 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 365 {
 366         return drm_do_vm_sg_fault(vma, vmf);
 367 }
 368
 369 /** AGP virtual memory operations */
 370 static const struct vm_operations_struct drm_vm_ops = {
 371         .fault = drm_vm_fault,
 372         .open = drm_vm_open,
 373         .close = drm_vm_close,
 374 };
 375
 376 /** Shared virtual memory operations */
 377 static const struct vm_operations_struct drm_vm_shm_ops = {
 378         .fault = drm_vm_shm_fault,
 379         .open = drm_vm_open,
 380         .close = drm_vm_shm_close,
 381 };
 382
 383 /** DMA virtual memory operations */
 384 static const struct vm_operations_struct drm_vm_dma_ops = {
 385         .fault = drm_vm_dma_fault,
 386         .open = drm_vm_open,
 387         .close = drm_vm_close,
 388 };
 389
 390 /** Scatter-gather virtual memory operations */
 391 static const struct vm_operations_struct drm_vm_sg_ops = {
 392         .fault = drm_vm_sg_fault,
 393         .open = drm_vm_open,
 394         .close = drm_vm_close,
 395 };
 396
 397 /**
 398  * \c open method for shared virtual memory.
 399  *
 400  * \param vma virtual memory area.
 401  *
 402  * Create a new drm_vma_entry structure as the \p vma private data entry and
 403  * add it to drm_device::vmalist.
 404  */
 405 void drm_vm_open_locked(struct drm_device *dev,
 406                 struct vm_area_struct *vma)
 407 {
 408         struct drm_vma_entry *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 = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 415         if (vma_entry) {
 416                 vma_entry->vma = vma;
 417                 vma_entry->pid = current->pid;
 418                 list_add(&vma_entry->head, &dev->vmalist);
 419         }
 420 }
 421 EXPORT_SYMBOL_GPL(drm_vm_open_locked);
 422
 423 static void drm_vm_open(struct vm_area_struct *vma)
 424 {
 425         struct drm_file *priv = vma->vm_file->private_data;
 426         struct drm_device *dev = priv->minor->dev;
 427
 428         mutex_lock(&dev->struct_mutex);
 429         drm_vm_open_locked(dev, vma);
 430         mutex_unlock(&dev->struct_mutex);
 431 }
 432
 433 void drm_vm_close_locked(struct drm_device *dev,
 434                 struct vm_area_struct *vma)
 435 {
 436         struct drm_vma_entry *pt, *temp;
 437
 438         DRM_DEBUG("0x%08lx,0x%08lx\n",
 439                   vma->vm_start, vma->vm_end - vma->vm_start);
 440         atomic_dec(&dev->vma_count);
 441
 442         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 443                 if (pt->vma == vma) {
 444                         list_del(&pt->head);
 445                         kfree(pt);
 446                         break;
 447                 }
 448         }
 449 }
 450
 451 /**
 452  * \c close method for all virtual memory types.
 453  *
 454  * \param vma virtual memory area.
 455  *
 456  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 457  * free it.
 458  */
 459 static void drm_vm_close(struct vm_area_struct *vma)
 460 {
 461         struct drm_file *priv = vma->vm_file->private_data;
 462         struct drm_device *dev = priv->minor->dev;
 463
 464         mutex_lock(&dev->struct_mutex);
 465         drm_vm_close_locked(dev, vma);
 466         mutex_unlock(&dev->struct_mutex);
 467 }
 468
 469 /**
 470  * mmap DMA memory.
 471  *
 472  * \param file_priv DRM file private.
 473  * \param vma virtual memory area.
 474  * \return zero on success or a negative number on failure.
 475  *
 476  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 477  * pointer, and calls vm_open().
 478  */
 479 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 480 {
 481         struct drm_file *priv = filp->private_data;
 482         struct drm_device *dev;
 483         struct drm_device_dma *dma;
 484         unsigned long length = vma->vm_end - vma->vm_start;
 485
 486         dev = priv->minor->dev;
 487         dma = dev->dma;
 488         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 489                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 490
 491         /* Length must match exact page count */
 492         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 493                 return -EINVAL;
 494         }
 495
 496         if (!capable(CAP_SYS_ADMIN) &&
 497             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 498                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 499 #if defined(__i386__) || defined(__x86_64__)
 500                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 501 #else
 502                 /* Ye gads this is ugly.  With more thought
 503                    we could move this up higher and use
 504                    `protection_map' instead.  */
 505                 vma->vm_page_prot =
 506                     __pgprot(pte_val
 507                              (pte_wrprotect
 508                               (__pte(pgprot_val(vma->vm_page_prot)))));
 509 #endif
 510         }
 511
 512         vma->vm_ops = &drm_vm_dma_ops;
 513
 514         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 515
 516         drm_vm_open_locked(dev, vma);
 517         return 0;
 518 }
 519
 520 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 521 {
 522 #ifdef __alpha__
 523         return dev->hose->dense_mem_base;
 524 #else
 525         return 0;
 526 #endif
 527 }
 528
 529 /**
 530  * mmap DMA memory.
 531  *
 532  * \param file_priv DRM file private.
 533  * \param vma virtual memory area.
 534  * \return zero on success or a negative number on failure.
 535  *
 536  * If the virtual memory area has no offset associated with it then it's a DMA
 537  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 538  * checks that the restricted flag is not set, sets the virtual memory operations
 539  * according to the mapping type and remaps the pages. Finally sets the file
 540  * pointer and calls vm_open().
 541  */
 542 int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 543 {
 544         struct drm_file *priv = filp->private_data;
 545         struct drm_device *dev = priv->minor->dev;
 546         struct drm_local_map *map = NULL;
 547         resource_size_t offset = 0;
 548         struct drm_hash_item *hash;
 549
 550         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 551                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 552
 553         if (!priv->authenticated)
 554                 return -EACCES;
 555
 556         /* We check for "dma". On Apple's UniNorth, it's valid to have
 557          * the AGP mapped at physical address 0
 558          * --BenH.
 559          */
 560         if (!vma->vm_pgoff
 561 #if __OS_HAS_AGP
 562             && (!dev->agp
 563                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 564 #endif
 565             )
 566                 return drm_mmap_dma(filp, vma);
 567
 568         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 569                 DRM_ERROR("Could not find map\n");
 570                 return -EINVAL;
 571         }
 572
 573         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 574         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 575                 return -EPERM;
 576
 577         /* Check for valid size. */
 578         if (map->size < vma->vm_end - vma->vm_start)
 579                 return -EINVAL;
 580
 581         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 582                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 583 #if defined(__i386__) || defined(__x86_64__)
 584                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 585 #else
 586                 /* Ye gads this is ugly.  With more thought
 587                    we could move this up higher and use
 588                    `protection_map' instead.  */
 589                 vma->vm_page_prot =
 590                     __pgprot(pte_val
 591                              (pte_wrprotect
 592                               (__pte(pgprot_val(vma->vm_page_prot)))));
 593 #endif
 594         }
 595
 596         switch (map->type) {
 597 #if !defined(__arm__)
 598         case _DRM_AGP:
 599                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
 600                         /*
 601                          * On some platforms we can't talk to bus dma address from the CPU, so for
 602                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 603                          * pages and mappings in fault()
 604                          */
 605 #if defined(__powerpc__)
 606                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 607 #endif
 608                         vma->vm_ops = &drm_vm_ops;
 609                         break;
 610                 }
 611                 /* fall through to _DRM_FRAME_BUFFER... */
 612 #endif
 613         case _DRM_FRAME_BUFFER:
 614         case _DRM_REGISTERS:
 615                 offset = drm_core_get_reg_ofs(dev);
 616                 vma->vm_page_prot = drm_io_prot(map, vma);
 617                 if (io_remap_pfn_range(vma, vma->vm_start,
 618                                        (map->offset + offset) >> PAGE_SHIFT,
 619                                        vma->vm_end - vma->vm_start,
 620                                        vma->vm_page_prot))
 621                         return -EAGAIN;
 622                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 623                           " offset = 0x%llx\n",
 624                           map->type,
 625                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
 626
 627                 vma->vm_ops = &drm_vm_ops;
 628                 break;
 629         case _DRM_CONSISTENT:
 630                 /* Consistent memory is really like shared memory. But
 631                  * it's allocated in a different way, so avoid fault */
 632                 if (remap_pfn_range(vma, vma->vm_start,
 633                     page_to_pfn(virt_to_page(map->handle)),
 634                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 635                         return -EAGAIN;
 636                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 637         /* fall through to _DRM_SHM */
 638         case _DRM_SHM:
 639                 vma->vm_ops = &drm_vm_shm_ops;
 640                 vma->vm_private_data = (void *)map;
 641                 break;
 642         case _DRM_SCATTER_GATHER:
 643                 vma->vm_ops = &drm_vm_sg_ops;
 644                 vma->vm_private_data = (void *)map;
 645                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 646                 break;
 647         default:
 648                 return -EINVAL; /* This should never happen. */
 649         }
 650         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 651
 652         drm_vm_open_locked(dev, vma);
 653         return 0;
 654 }
 655
 656 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 657 {
 658         struct drm_file *priv = filp->private_data;
 659         struct drm_device *dev = priv->minor->dev;
 660         int ret;
 661
 662         if (drm_device_is_unplugged(dev))
 663                 return -ENODEV;
 664
 665         mutex_lock(&dev->struct_mutex);
 666         ret = drm_mmap_locked(filp, vma);
 667         mutex_unlock(&dev->struct_mutex);
 668
 669         return ret;
 670 }
 671 EXPORT_SYMBOL(drm_mmap);