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