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