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         drm_file_t *priv = vma->vm_file->private_data;
  83         drm_device_t *dev = priv->head->dev;
  84         drm_map_t *map = NULL;
  85         drm_map_list_t *r_list;
  86         drm_hash_item_t *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, drm_map_list_t, 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                 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
 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         drm_map_t *map = (drm_map_t *) 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         drm_file_t *priv = vma->vm_file->private_data;
 198         drm_device_t *dev = priv->head->dev;
 199         drm_vma_entry_t *pt, *prev, *next;
 200         drm_map_t *map;
 201         drm_map_list_t *r_list;
 202         struct list_head *list;
 203         int found_maps = 0;
 204
 205         DRM_DEBUG("0x%08lx,0x%08lx\n",
 206                   vma->vm_start, vma->vm_end - vma->vm_start);
 207         atomic_dec(&dev->vma_count);
 208
 209         map = vma->vm_private_data;
 210
 211         mutex_lock(&dev->struct_mutex);
 212         for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
 213                 next = pt->next;
 214                 if (pt->vma->vm_private_data == map)
 215                         found_maps++;
 216                 if (pt->vma == vma) {
 217                         if (prev) {
 218                                 prev->next = pt->next;
 219                         } else {
 220                                 dev->vmalist = pt->next;
 221                         }
 222                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 223                 } else {
 224                         prev = pt;
 225                 }
 226         }
 227         /* We were the only map that was found */
 228         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 229                 /* Check to see if we are in the maplist, if we are not, then
 230                  * we delete this mappings information.
 231                  */
 232                 found_maps = 0;
 233                 list = &dev->maplist->head;
 234                 list_for_each(list, &dev->maplist->head) {
 235                         r_list = list_entry(list, drm_map_list_t, head);
 236                         if (r_list->map == map)
 237                                 found_maps++;
 238                 }
 239
 240                 if (!found_maps) {
 241                         drm_dma_handle_t dmah;
 242
 243                         switch (map->type) {
 244                         case _DRM_REGISTERS:
 245                         case _DRM_FRAME_BUFFER:
 246                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 247                                         int retcode;
 248                                         retcode = mtrr_del(map->mtrr,
 249                                                            map->offset,
 250                                                            map->size);
 251                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 252                                 }
 253                                 iounmap(map->handle);
 254                                 break;
 255                         case _DRM_SHM:
 256                                 vfree(map->handle);
 257                                 break;
 258                         case _DRM_AGP:
 259                         case _DRM_SCATTER_GATHER:
 260                                 break;
 261                         case _DRM_CONSISTENT:
 262                                 dmah.vaddr = map->handle;
 263                                 dmah.busaddr = map->offset;
 264                                 dmah.size = map->size;
 265                                 __drm_pci_free(dev, &dmah);
 266                                 break;
 267                         }
 268                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 269                 }
 270         }
 271         mutex_unlock(&dev->struct_mutex);
 272 }
 273
 274 /**
 275  * \c nopage method for DMA virtual memory.
 276  *
 277  * \param vma virtual memory area.
 278  * \param address access address.
 279  * \return pointer to the page structure.
 280  *
 281  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 282  */
 283 static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
 284                                                     unsigned long address)
 285 {
 286         drm_file_t *priv = vma->vm_file->private_data;
 287         drm_device_t *dev = priv->head->dev;
 288         drm_device_dma_t *dma = dev->dma;
 289         unsigned long offset;
 290         unsigned long page_nr;
 291         struct page *page;
 292
 293         if (!dma)
 294                 return NOPAGE_SIGBUS;   /* Error */
 295         if (address > vma->vm_end)
 296                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 297         if (!dma->pagelist)
 298                 return NOPAGE_SIGBUS;   /* Nothing allocated */
 299
 300         offset = address - vma->vm_start;       /* vm_[pg]off[set] should be 0 */
 301         page_nr = offset >> PAGE_SHIFT;
 302         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
 303
 304         get_page(page);
 305
 306         DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
 307         return page;
 308 }
 309
 310 /**
 311  * \c nopage method for scatter-gather virtual memory.
 312  *
 313  * \param vma virtual memory area.
 314  * \param address access address.
 315  * \return pointer to the page structure.
 316  *
 317  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 318  */
 319 static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
 320                                                    unsigned long address)
 321 {
 322         drm_map_t *map = (drm_map_t *) vma->vm_private_data;
 323         drm_file_t *priv = vma->vm_file->private_data;
 324         drm_device_t *dev = priv->head->dev;
 325         drm_sg_mem_t *entry = dev->sg;
 326         unsigned long offset;
 327         unsigned long map_offset;
 328         unsigned long page_offset;
 329         struct page *page;
 330
 331         if (!entry)
 332                 return NOPAGE_SIGBUS;   /* Error */
 333         if (address > vma->vm_end)
 334                 return NOPAGE_SIGBUS;   /* Disallow mremap */
 335         if (!entry->pagelist)
 336                 return NOPAGE_SIGBUS;   /* Nothing allocated */
 337
 338         offset = address - vma->vm_start;
 339         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 340         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 341         page = entry->pagelist[page_offset];
 342         get_page(page);
 343
 344         return page;
 345 }
 346
 347 static struct page *drm_vm_nopage(struct vm_area_struct *vma,
 348                                   unsigned long address, int *type)
 349 {
 350         if (type)
 351                 *type = VM_FAULT_MINOR;
 352         return drm_do_vm_nopage(vma, address);
 353 }
 354
 355 static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
 356                                       unsigned long address, int *type)
 357 {
 358         if (type)
 359                 *type = VM_FAULT_MINOR;
 360         return drm_do_vm_shm_nopage(vma, address);
 361 }
 362
 363 static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
 364                                       unsigned long address, int *type)
 365 {
 366         if (type)
 367                 *type = VM_FAULT_MINOR;
 368         return drm_do_vm_dma_nopage(vma, address);
 369 }
 370
 371 static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
 372                                      unsigned long address, int *type)
 373 {
 374         if (type)
 375                 *type = VM_FAULT_MINOR;
 376         return drm_do_vm_sg_nopage(vma, address);
 377 }
 378
 379 /** AGP virtual memory operations */
 380 static struct vm_operations_struct drm_vm_ops = {
 381         .nopage = drm_vm_nopage,
 382         .open = drm_vm_open,
 383         .close = drm_vm_close,
 384 };
 385
 386 /** Shared virtual memory operations */
 387 static struct vm_operations_struct drm_vm_shm_ops = {
 388         .nopage = drm_vm_shm_nopage,
 389         .open = drm_vm_open,
 390         .close = drm_vm_shm_close,
 391 };
 392
 393 /** DMA virtual memory operations */
 394 static struct vm_operations_struct drm_vm_dma_ops = {
 395         .nopage = drm_vm_dma_nopage,
 396         .open = drm_vm_open,
 397         .close = drm_vm_close,
 398 };
 399
 400 /** Scatter-gather virtual memory operations */
 401 static struct vm_operations_struct drm_vm_sg_ops = {
 402         .nopage = drm_vm_sg_nopage,
 403         .open = drm_vm_open,
 404         .close = drm_vm_close,
 405 };
 406
 407 /**
 408  * \c open method for shared virtual memory.
 409  *
 410  * \param vma virtual memory area.
 411  *
 412  * Create a new drm_vma_entry structure as the \p vma private data entry and
 413  * add it to drm_device::vmalist.
 414  */
 415 static void drm_vm_open_locked(struct vm_area_struct *vma)
 416 {
 417         drm_file_t *priv = vma->vm_file->private_data;
 418         drm_device_t *dev = priv->head->dev;
 419         drm_vma_entry_t *vma_entry;
 420
 421         DRM_DEBUG("0x%08lx,0x%08lx\n",
 422                   vma->vm_start, vma->vm_end - vma->vm_start);
 423         atomic_inc(&dev->vma_count);
 424
 425         vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
 426         if (vma_entry) {
 427                 vma_entry->vma = vma;
 428                 vma_entry->next = dev->vmalist;
 429                 vma_entry->pid = current->pid;
 430                 dev->vmalist = vma_entry;
 431         }
 432 }
 433
 434 static void drm_vm_open(struct vm_area_struct *vma)
 435 {
 436         drm_file_t *priv = vma->vm_file->private_data;
 437         drm_device_t *dev = priv->head->dev;
 438
 439         mutex_lock(&dev->struct_mutex);
 440         drm_vm_open_locked(vma);
 441         mutex_unlock(&dev->struct_mutex);
 442 }
 443
 444 /**
 445  * \c close method for all virtual memory types.
 446  *
 447  * \param vma virtual memory area.
 448  *
 449  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 450  * free it.
 451  */
 452 static void drm_vm_close(struct vm_area_struct *vma)
 453 {
 454         drm_file_t *priv = vma->vm_file->private_data;
 455         drm_device_t *dev = priv->head->dev;
 456         drm_vma_entry_t *pt, *prev;
 457
 458         DRM_DEBUG("0x%08lx,0x%08lx\n",
 459                   vma->vm_start, vma->vm_end - vma->vm_start);
 460         atomic_dec(&dev->vma_count);
 461
 462         mutex_lock(&dev->struct_mutex);
 463         for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
 464                 if (pt->vma == vma) {
 465                         if (prev) {
 466                                 prev->next = pt->next;
 467                         } else {
 468                                 dev->vmalist = pt->next;
 469                         }
 470                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 471                         break;
 472                 }
 473         }
 474         mutex_unlock(&dev->struct_mutex);
 475 }
 476
 477 /**
 478  * mmap DMA memory.
 479  *
 480  * \param filp file pointer.
 481  * \param vma virtual memory area.
 482  * \return zero on success or a negative number on failure.
 483  *
 484  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 485  * pointer, and calls vm_open().
 486  */
 487 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 488 {
 489         drm_file_t *priv = filp->private_data;
 490         drm_device_t *dev;
 491         drm_device_dma_t *dma;
 492         unsigned long length = vma->vm_end - vma->vm_start;
 493
 494         dev = priv->head->dev;
 495         dma = dev->dma;
 496         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 497                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 498
 499         /* Length must match exact page count */
 500         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 501                 return -EINVAL;
 502         }
 503
 504         if (!capable(CAP_SYS_ADMIN) &&
 505             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 506                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 507 #if defined(__i386__) || defined(__x86_64__)
 508                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 509 #else
 510                 /* Ye gads this is ugly.  With more thought
 511                    we could move this up higher and use
 512                    `protection_map' instead.  */
 513                 vma->vm_page_prot =
 514                     __pgprot(pte_val
 515                              (pte_wrprotect
 516                               (__pte(pgprot_val(vma->vm_page_prot)))));
 517 #endif
 518         }
 519
 520         vma->vm_ops = &drm_vm_dma_ops;
 521
 522         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 523
 524         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 525         drm_vm_open_locked(vma);
 526         return 0;
 527 }
 528
 529 unsigned long drm_core_get_map_ofs(drm_map_t * map)
 530 {
 531         return map->offset;
 532 }
 533
 534 EXPORT_SYMBOL(drm_core_get_map_ofs);
 535
 536 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
 537 {
 538 #ifdef __alpha__
 539         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
 540 #else
 541         return 0;
 542 #endif
 543 }
 544
 545 EXPORT_SYMBOL(drm_core_get_reg_ofs);
 546
 547 /**
 548  * mmap DMA memory.
 549  *
 550  * \param filp file pointer.
 551  * \param vma virtual memory area.
 552  * \return zero on success or a negative number on failure.
 553  *
 554  * If the virtual memory area has no offset associated with it then it's a DMA
 555  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 556  * checks that the restricted flag is not set, sets the virtual memory operations
 557  * according to the mapping type and remaps the pages. Finally sets the file
 558  * pointer and calls vm_open().
 559  */
 560 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 561 {
 562         drm_file_t *priv = filp->private_data;
 563         drm_device_t *dev = priv->head->dev;
 564         drm_map_t *map = NULL;
 565         unsigned long offset = 0;
 566         drm_hash_item_t *hash;
 567
 568         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 569                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 570
 571         if (!priv->authenticated)
 572                 return -EACCES;
 573
 574         /* We check for "dma". On Apple's UniNorth, it's valid to have
 575          * the AGP mapped at physical address 0
 576          * --BenH.
 577          */
 578         if (!vma->vm_pgoff
 579 #if __OS_HAS_AGP
 580             && (!dev->agp
 581                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 582 #endif
 583             )
 584                 return drm_mmap_dma(filp, vma);
 585
 586         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 587                 DRM_ERROR("Could not find map\n");
 588                 return -EINVAL;
 589         }
 590
 591         map = drm_hash_entry(hash, drm_map_list_t, hash)->map;
 592         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 593                 return -EPERM;
 594
 595         /* Check for valid size. */
 596         if (map->size < vma->vm_end - vma->vm_start)
 597                 return -EINVAL;
 598
 599         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 600                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 601 #if defined(__i386__) || defined(__x86_64__)
 602                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 603 #else
 604                 /* Ye gads this is ugly.  With more thought
 605                    we could move this up higher and use
 606                    `protection_map' instead.  */
 607                 vma->vm_page_prot =
 608                     __pgprot(pte_val
 609                              (pte_wrprotect
 610                               (__pte(pgprot_val(vma->vm_page_prot)))));
 611 #endif
 612         }
 613
 614         switch (map->type) {
 615         case _DRM_AGP:
 616                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
 617                         /*
 618                          * On some platforms we can't talk to bus dma address from the CPU, so for
 619                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 620                          * pages and mappings in nopage()
 621                          */
 622 #if defined(__powerpc__)
 623                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 624 #endif
 625                         vma->vm_ops = &drm_vm_ops;
 626                         break;
 627                 }
 628                 /* fall through to _DRM_FRAME_BUFFER... */
 629         case _DRM_FRAME_BUFFER:
 630         case _DRM_REGISTERS:
 631                 offset = dev->driver->get_reg_ofs(dev);
 632                 vma->vm_flags |= VM_IO; /* not in core dump */
 633                 vma->vm_page_prot = drm_io_prot(map->type, vma);
 634 #ifdef __sparc__
 635                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 636 #endif
 637                 if (io_remap_pfn_range(vma, vma->vm_start,
 638                                        (map->offset + offset) >> PAGE_SHIFT,
 639                                        vma->vm_end - vma->vm_start,
 640                                        vma->vm_page_prot))
 641                         return -EAGAIN;
 642                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 643                           " offset = 0x%lx\n",
 644                           map->type,
 645                           vma->vm_start, vma->vm_end, map->offset + offset);
 646                 vma->vm_ops = &drm_vm_ops;
 647                 break;
 648         case _DRM_CONSISTENT:
 649                 /* Consistent memory is really like shared memory. But
 650                  * it's allocated in a different way, so avoid nopage */
 651                 if (remap_pfn_range(vma, vma->vm_start,
 652                     page_to_pfn(virt_to_page(map->handle)),
 653                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 654                         return -EAGAIN;
 655         /* fall through to _DRM_SHM */
 656         case _DRM_SHM:
 657                 vma->vm_ops = &drm_vm_shm_ops;
 658                 vma->vm_private_data = (void *)map;
 659                 /* Don't let this area swap.  Change when
 660                    DRM_KERNEL advisory is supported. */
 661                 vma->vm_flags |= VM_RESERVED;
 662                 break;
 663         case _DRM_SCATTER_GATHER:
 664                 vma->vm_ops = &drm_vm_sg_ops;
 665                 vma->vm_private_data = (void *)map;
 666                 vma->vm_flags |= VM_RESERVED;
 667                 break;
 668         default:
 669                 return -EINVAL; /* This should never happen. */
 670         }
 671         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 672
 673         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 674         drm_vm_open_locked(vma);
 675         return 0;
 676 }
 677
 678 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 679 {
 680         drm_file_t *priv = filp->private_data;
 681         drm_device_t *dev = priv->head->dev;
 682         int ret;
 683
 684         mutex_lock(&dev->struct_mutex);
 685         ret = drm_mmap_locked(filp, vma);
 686         mutex_unlock(&dev->struct_mutex);
 687
 688         return ret;
 689 }
 690 EXPORT_SYMBOL(drm_mmap);