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 "drmP.h"
  37 #if defined(__ia64__)
  38 #include <linux/efi.h>
  39 #include <linux/slab.h>
  40 #endif
  41
  42 static void drm_vm_open(struct vm_area_struct *vma);
  43 static void drm_vm_close(struct vm_area_struct *vma);
  44
  45 static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
  46 {
  47         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  48
  49 #if defined(__i386__) || defined(__x86_64__)
  50         if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
  51                 pgprot_val(tmp) |= _PAGE_PCD;
  52                 pgprot_val(tmp) &= ~_PAGE_PWT;
  53         }
  54 #elif defined(__powerpc__)
  55         pgprot_val(tmp) |= _PAGE_NO_CACHE;
  56         if (map_type == _DRM_REGISTERS)
  57                 pgprot_val(tmp) |= _PAGE_GUARDED;
  58 #elif 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 #elif defined(__sparc__) || defined(__arm__)
  65         tmp = pgprot_noncached(tmp);
  66 #endif
  67         return tmp;
  68 }
  69
  70 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  71 {
  72         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  73
  74 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
  75         tmp |= _PAGE_NO_CACHE;
  76 #endif
  77         return tmp;
  78 }
  79
  80 /**
  81  * \c fault method for AGP virtual memory.
  82  *
  83  * \param vma virtual memory area.
  84  * \param address access address.
  85  * \return pointer to the page structure.
  86  *
  87  * Find the right map and if it's AGP memory find the real physical page to
  88  * map, get the page, increment the use count and return it.
  89  */
  90 #if __OS_HAS_AGP
  91 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  92 {
  93         struct drm_file *priv = vma->vm_file->private_data;
  94         struct drm_device *dev = priv->minor->dev;
  95         struct drm_local_map *map = NULL;
  96         struct drm_map_list *r_list;
  97         struct drm_hash_item *hash;
  98
  99         /*
 100          * Find the right map
 101          */
 102         if (!drm_core_has_AGP(dev))
 103                 goto vm_fault_error;
 104
 105         if (!dev->agp || !dev->agp->cant_use_aperture)
 106                 goto vm_fault_error;
 107
 108         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
 109                 goto vm_fault_error;
 110
 111         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 112         map = r_list->map;
 113
 114         if (map && map->type == _DRM_AGP) {
 115                 /*
 116                  * Using vm_pgoff as a selector forces us to use this unusual
 117                  * addressing scheme.
 118                  */
 119                 resource_size_t offset = (unsigned long)vmf->virtual_address -
 120                         vma->vm_start;
 121                 resource_size_t baddr = map->offset + offset;
 122                 struct drm_agp_mem *agpmem;
 123                 struct page *page;
 124
 125 #ifdef __alpha__
 126                 /*
 127                  * Adjust to a bus-relative address
 128                  */
 129                 baddr -= dev->hose->mem_space->start;
 130 #endif
 131
 132                 /*
 133                  * It's AGP memory - find the real physical page to map
 134                  */
 135                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 136                         if (agpmem->bound <= baddr &&
 137                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 138                                 break;
 139                 }
 140
 141                 if (&agpmem->head == &dev->agp->memory)
 142                         goto vm_fault_error;
 143
 144                 /*
 145                  * Get the page, inc the use count, and return it
 146                  */
 147                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 148                 page = agpmem->memory->pages[offset];
 149                 get_page(page);
 150                 vmf->page = page;
 151
 152                 DRM_DEBUG
 153                     ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
 154                      (unsigned long long)baddr,
 155                      agpmem->memory->pages[offset],
 156                      (unsigned long long)offset,
 157                      page_count(page));
 158                 return 0;
 159         }
 160 vm_fault_error:
 161         return VM_FAULT_SIGBUS; /* Disallow mremap */
 162 }
 163 #else                           /* __OS_HAS_AGP */
 164 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 165 {
 166         return VM_FAULT_SIGBUS;
 167 }
 168 #endif                          /* __OS_HAS_AGP */
 169
 170 /**
 171  * \c nopage method for shared virtual memory.
 172  *
 173  * \param vma virtual memory area.
 174  * \param address access address.
 175  * \return pointer to the page structure.
 176  *
 177  * Get the mapping, find the real physical page to map, get the page, and
 178  * return it.
 179  */
 180 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 181 {
 182         struct drm_local_map *map = vma->vm_private_data;
 183         unsigned long offset;
 184         unsigned long i;
 185         struct page *page;
 186
 187         if (!map)
 188                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 189
 190         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 191         i = (unsigned long)map->handle + offset;
 192         page = vmalloc_to_page((void *)i);
 193         if (!page)
 194                 return VM_FAULT_SIGBUS;
 195         get_page(page);
 196         vmf->page = page;
 197
 198         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 199         return 0;
 200 }
 201
 202 /**
 203  * \c close method for shared virtual memory.
 204  *
 205  * \param vma virtual memory area.
 206  *
 207  * Deletes map information if we are the last
 208  * person to close a mapping and it's not in the global maplist.
 209  */
 210 static void drm_vm_shm_close(struct vm_area_struct *vma)
 211 {
 212         struct drm_file *priv = vma->vm_file->private_data;
 213         struct drm_device *dev = priv->minor->dev;
 214         struct drm_vma_entry *pt, *temp;
 215         struct drm_local_map *map;
 216         struct drm_map_list *r_list;
 217         int found_maps = 0;
 218
 219         DRM_DEBUG("0x%08lx,0x%08lx\n",
 220                   vma->vm_start, vma->vm_end - vma->vm_start);
 221         atomic_dec(&dev->vma_count);
 222
 223         map = vma->vm_private_data;
 224
 225         mutex_lock(&dev->struct_mutex);
 226         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 227                 if (pt->vma->vm_private_data == map)
 228                         found_maps++;
 229                 if (pt->vma == vma) {
 230                         list_del(&pt->head);
 231                         kfree(pt);
 232                 }
 233         }
 234
 235         /* We were the only map that was found */
 236         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 237                 /* Check to see if we are in the maplist, if we are not, then
 238                  * we delete this mappings information.
 239                  */
 240                 found_maps = 0;
 241                 list_for_each_entry(r_list, &dev->maplist, head) {
 242                         if (r_list->map == map)
 243                                 found_maps++;
 244                 }
 245
 246                 if (!found_maps) {
 247                         drm_dma_handle_t dmah;
 248
 249                         switch (map->type) {
 250                         case _DRM_REGISTERS:
 251                         case _DRM_FRAME_BUFFER:
 252                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 253                                         int retcode;
 254                                         retcode = mtrr_del(map->mtrr,
 255                                                            map->offset,
 256                                                            map->size);
 257                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 258                                 }
 259                                 iounmap(map->handle);
 260                                 break;
 261                         case _DRM_SHM:
 262                                 vfree(map->handle);
 263                                 break;
 264                         case _DRM_AGP:
 265                         case _DRM_SCATTER_GATHER:
 266                                 break;
 267                         case _DRM_CONSISTENT:
 268                                 dmah.vaddr = map->handle;
 269                                 dmah.busaddr = map->offset;
 270                                 dmah.size = map->size;
 271                                 __drm_pci_free(dev, &dmah);
 272                                 break;
 273                         case _DRM_GEM:
 274                                 DRM_ERROR("tried to rmmap GEM object\n");
 275                                 break;
 276                         }
 277                         kfree(map);
 278                 }
 279         }
 280         mutex_unlock(&dev->struct_mutex);
 281 }
 282
 283 /**
 284  * \c fault method for DMA virtual memory.
 285  *
 286  * \param vma virtual memory area.
 287  * \param address access address.
 288  * \return pointer to the page structure.
 289  *
 290  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 291  */
 292 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 293 {
 294         struct drm_file *priv = vma->vm_file->private_data;
 295         struct drm_device *dev = priv->minor->dev;
 296         struct drm_device_dma *dma = dev->dma;
 297         unsigned long offset;
 298         unsigned long page_nr;
 299         struct page *page;
 300
 301         if (!dma)
 302                 return VM_FAULT_SIGBUS; /* Error */
 303         if (!dma->pagelist)
 304                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 305
 306         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
 307         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 308         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
 309
 310         get_page(page);
 311         vmf->page = page;
 312
 313         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 314         return 0;
 315 }
 316
 317 /**
 318  * \c fault method for scatter-gather virtual memory.
 319  *
 320  * \param vma virtual memory area.
 321  * \param address access address.
 322  * \return pointer to the page structure.
 323  *
 324  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 325  */
 326 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 327 {
 328         struct drm_local_map *map = vma->vm_private_data;
 329         struct drm_file *priv = vma->vm_file->private_data;
 330         struct drm_device *dev = priv->minor->dev;
 331         struct drm_sg_mem *entry = dev->sg;
 332         unsigned long offset;
 333         unsigned long map_offset;
 334         unsigned long page_offset;
 335         struct page *page;
 336
 337         if (!entry)
 338                 return VM_FAULT_SIGBUS; /* Error */
 339         if (!entry->pagelist)
 340                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 341
 342         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 343         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 344         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 345         page = entry->pagelist[page_offset];
 346         get_page(page);
 347         vmf->page = page;
 348
 349         return 0;
 350 }
 351
 352 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 353 {
 354         return drm_do_vm_fault(vma, vmf);
 355 }
 356
 357 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 358 {
 359         return drm_do_vm_shm_fault(vma, vmf);
 360 }
 361
 362 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 363 {
 364         return drm_do_vm_dma_fault(vma, vmf);
 365 }
 366
 367 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 368 {
 369         return drm_do_vm_sg_fault(vma, vmf);
 370 }
 371
 372 /** AGP virtual memory operations */
 373 static const struct vm_operations_struct drm_vm_ops = {
 374         .fault = drm_vm_fault,
 375         .open = drm_vm_open,
 376         .close = drm_vm_close,
 377 };
 378
 379 /** Shared virtual memory operations */
 380 static const struct vm_operations_struct drm_vm_shm_ops = {
 381         .fault = drm_vm_shm_fault,
 382         .open = drm_vm_open,
 383         .close = drm_vm_shm_close,
 384 };
 385
 386 /** DMA virtual memory operations */
 387 static const struct vm_operations_struct drm_vm_dma_ops = {
 388         .fault = drm_vm_dma_fault,
 389         .open = drm_vm_open,
 390         .close = drm_vm_close,
 391 };
 392
 393 /** Scatter-gather virtual memory operations */
 394 static const struct vm_operations_struct drm_vm_sg_ops = {
 395         .fault = drm_vm_sg_fault,
 396         .open = drm_vm_open,
 397         .close = drm_vm_close,
 398 };
 399
 400 /**
 401  * \c open method for shared virtual memory.
 402  *
 403  * \param vma virtual memory area.
 404  *
 405  * Create a new drm_vma_entry structure as the \p vma private data entry and
 406  * add it to drm_device::vmalist.
 407  */
 408 void drm_vm_open_locked(struct vm_area_struct *vma)
 409 {
 410         struct drm_file *priv = vma->vm_file->private_data;
 411         struct drm_device *dev = priv->minor->dev;
 412         struct drm_vma_entry *vma_entry;
 413
 414         DRM_DEBUG("0x%08lx,0x%08lx\n",
 415                   vma->vm_start, vma->vm_end - vma->vm_start);
 416         atomic_inc(&dev->vma_count);
 417
 418         vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 419         if (vma_entry) {
 420                 vma_entry->vma = vma;
 421                 vma_entry->pid = current->pid;
 422                 list_add(&vma_entry->head, &dev->vmalist);
 423         }
 424 }
 425
 426 static void drm_vm_open(struct vm_area_struct *vma)
 427 {
 428         struct drm_file *priv = vma->vm_file->private_data;
 429         struct drm_device *dev = priv->minor->dev;
 430
 431         mutex_lock(&dev->struct_mutex);
 432         drm_vm_open_locked(vma);
 433         mutex_unlock(&dev->struct_mutex);
 434 }
 435
 436 /**
 437  * \c close method for all virtual memory types.
 438  *
 439  * \param vma virtual memory area.
 440  *
 441  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 442  * free it.
 443  */
 444 static void drm_vm_close(struct vm_area_struct *vma)
 445 {
 446         struct drm_file *priv = vma->vm_file->private_data;
 447         struct drm_device *dev = priv->minor->dev;
 448         struct drm_vma_entry *pt, *temp;
 449
 450         DRM_DEBUG("0x%08lx,0x%08lx\n",
 451                   vma->vm_start, vma->vm_end - vma->vm_start);
 452         atomic_dec(&dev->vma_count);
 453
 454         mutex_lock(&dev->struct_mutex);
 455         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 456                 if (pt->vma == vma) {
 457                         list_del(&pt->head);
 458                         kfree(pt);
 459                         break;
 460                 }
 461         }
 462         mutex_unlock(&dev->struct_mutex);
 463 }
 464
 465 /**
 466  * mmap DMA memory.
 467  *
 468  * \param file_priv DRM file private.
 469  * \param vma virtual memory area.
 470  * \return zero on success or a negative number on failure.
 471  *
 472  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 473  * pointer, and calls vm_open().
 474  */
 475 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 476 {
 477         struct drm_file *priv = filp->private_data;
 478         struct drm_device *dev;
 479         struct drm_device_dma *dma;
 480         unsigned long length = vma->vm_end - vma->vm_start;
 481
 482         dev = priv->minor->dev;
 483         dma = dev->dma;
 484         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 485                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 486
 487         /* Length must match exact page count */
 488         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 489                 return -EINVAL;
 490         }
 491
 492         if (!capable(CAP_SYS_ADMIN) &&
 493             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 494                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 495 #if defined(__i386__) || defined(__x86_64__)
 496                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 497 #else
 498                 /* Ye gads this is ugly.  With more thought
 499                    we could move this up higher and use
 500                    `protection_map' instead.  */
 501                 vma->vm_page_prot =
 502                     __pgprot(pte_val
 503                              (pte_wrprotect
 504                               (__pte(pgprot_val(vma->vm_page_prot)))));
 505 #endif
 506         }
 507
 508         vma->vm_ops = &drm_vm_dma_ops;
 509
 510         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 511         vma->vm_flags |= VM_DONTEXPAND;
 512
 513         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 514         drm_vm_open_locked(vma);
 515         return 0;
 516 }
 517
 518 resource_size_t drm_core_get_map_ofs(struct drm_local_map * map)
 519 {
 520         return map->offset;
 521 }
 522
 523 EXPORT_SYMBOL(drm_core_get_map_ofs);
 524
 525 resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 526 {
 527 #ifdef __alpha__
 528         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
 529 #else
 530         return 0;
 531 #endif
 532 }
 533
 534 EXPORT_SYMBOL(drm_core_get_reg_ofs);
 535
 536 /**
 537  * mmap DMA memory.
 538  *
 539  * \param file_priv DRM file private.
 540  * \param vma virtual memory area.
 541  * \return zero on success or a negative number on failure.
 542  *
 543  * If the virtual memory area has no offset associated with it then it's a DMA
 544  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 545  * checks that the restricted flag is not set, sets the virtual memory operations
 546  * according to the mapping type and remaps the pages. Finally sets the file
 547  * pointer and calls vm_open().
 548  */
 549 int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 550 {
 551         struct drm_file *priv = filp->private_data;
 552         struct drm_device *dev = priv->minor->dev;
 553         struct drm_local_map *map = NULL;
 554         resource_size_t offset = 0;
 555         struct drm_hash_item *hash;
 556
 557         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 558                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 559
 560         if (!priv->authenticated)
 561                 return -EACCES;
 562
 563         /* We check for "dma". On Apple's UniNorth, it's valid to have
 564          * the AGP mapped at physical address 0
 565          * --BenH.
 566          */
 567         if (!vma->vm_pgoff
 568 #if __OS_HAS_AGP
 569             && (!dev->agp
 570                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 571 #endif
 572             )
 573                 return drm_mmap_dma(filp, vma);
 574
 575         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 576                 DRM_ERROR("Could not find map\n");
 577                 return -EINVAL;
 578         }
 579
 580         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 581         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 582                 return -EPERM;
 583
 584         /* Check for valid size. */
 585         if (map->size < vma->vm_end - vma->vm_start)
 586                 return -EINVAL;
 587
 588         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 589                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 590 #if defined(__i386__) || defined(__x86_64__)
 591                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 592 #else
 593                 /* Ye gads this is ugly.  With more thought
 594                    we could move this up higher and use
 595                    `protection_map' instead.  */
 596                 vma->vm_page_prot =
 597                     __pgprot(pte_val
 598                              (pte_wrprotect
 599                               (__pte(pgprot_val(vma->vm_page_prot)))));
 600 #endif
 601         }
 602
 603         switch (map->type) {
 604 #if !defined(__arm__)
 605         case _DRM_AGP:
 606                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
 607                         /*
 608                          * On some platforms we can't talk to bus dma address from the CPU, so for
 609                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 610                          * pages and mappings in fault()
 611                          */
 612 #if defined(__powerpc__)
 613                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 614 #endif
 615                         vma->vm_ops = &drm_vm_ops;
 616                         break;
 617                 }
 618                 /* fall through to _DRM_FRAME_BUFFER... */
 619 #endif
 620         case _DRM_FRAME_BUFFER:
 621         case _DRM_REGISTERS:
 622                 offset = dev->driver->get_reg_ofs(dev);
 623                 vma->vm_flags |= VM_IO; /* not in core dump */
 624                 vma->vm_page_prot = drm_io_prot(map->type, vma);
 625 #if !defined(__arm__)
 626                 if (io_remap_pfn_range(vma, vma->vm_start,
 627                                        (map->offset + offset) >> PAGE_SHIFT,
 628                                        vma->vm_end - vma->vm_start,
 629                                        vma->vm_page_prot))
 630                         return -EAGAIN;
 631 #else
 632                 if (remap_pfn_range(vma, vma->vm_start,
 633                                         (map->offset + offset) >> PAGE_SHIFT,
 634                                         vma->vm_end - vma->vm_start,
 635                                         vma->vm_page_prot))
 636                         return -EAGAIN;
 637 #endif
 638
 639                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 640                           " offset = 0x%llx\n",
 641                           map->type,
 642                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
 643
 644                 vma->vm_ops = &drm_vm_ops;
 645                 break;
 646         case _DRM_CONSISTENT:
 647                 /* Consistent memory is really like shared memory. But
 648                  * it's allocated in a different way, so avoid fault */
 649                 if (remap_pfn_range(vma, vma->vm_start,
 650                     page_to_pfn(virt_to_page(map->handle)),
 651                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 652                         return -EAGAIN;
 653                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 654         /* fall through to _DRM_SHM */
 655         case _DRM_SHM:
 656                 vma->vm_ops = &drm_vm_shm_ops;
 657                 vma->vm_private_data = (void *)map;
 658                 /* Don't let this area swap.  Change when
 659                    DRM_KERNEL advisory is supported. */
 660                 vma->vm_flags |= VM_RESERVED;
 661                 break;
 662         case _DRM_SCATTER_GATHER:
 663                 vma->vm_ops = &drm_vm_sg_ops;
 664                 vma->vm_private_data = (void *)map;
 665                 vma->vm_flags |= VM_RESERVED;
 666                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 667                 break;
 668         default:
 669                 return -EINVAL; /* This should never happen. */
 670         }
 671         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 672         vma->vm_flags |= VM_DONTEXPAND;
 673
 674         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 675         drm_vm_open_locked(vma);
 676         return 0;
 677 }
 678
 679 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 680 {
 681         struct drm_file *priv = filp->private_data;
 682         struct drm_device *dev = priv->minor->dev;
 683         int ret;
 684
 685         mutex_lock(&dev->struct_mutex);
 686         ret = drm_mmap_locked(filp, vma);
 687         mutex_unlock(&dev->struct_mutex);
 688
 689         return ret;
 690 }
 691 EXPORT_SYMBOL(drm_mmap);