err.no Git - linux-2.6/blob - 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 fault 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 int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  80 {
  81         struct drm_file *priv = vma->vm_file->private_data;
  82         struct drm_device *dev = priv->head->dev;
  83         struct drm_map *map = NULL;
  84         struct drm_map_list *r_list;
  85         struct drm_hash_item *hash;
  86
  87         /*
  88          * Find the right map
  89          */
  90         if (!drm_core_has_AGP(dev))
  91                 goto vm_fault_error;
  92
  93         if (!dev->agp || !dev->agp->cant_use_aperture)
  94                 goto vm_fault_error;
  95
  96         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
  97                 goto vm_fault_error;
  98
  99         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 100         map = r_list->map;
 101
 102         if (map && map->type == _DRM_AGP) {
 103                 /*
 104                  * Using vm_pgoff as a selector forces us to use this unusual
 105                  * addressing scheme.
 106                  */
 107                 unsigned long offset = (unsigned long)vmf->virtual_address -
 108                                                                 vma->vm_start;
 109                 unsigned long baddr = map->offset + offset;
 110                 struct drm_agp_mem *agpmem;
 111                 struct page *page;
 112
 113 #ifdef __alpha__
 114                 /*
 115                  * Adjust to a bus-relative address
 116                  */
 117                 baddr -= dev->hose->mem_space->start;
 118 #endif
 119
 120                 /*
 121                  * It's AGP memory - find the real physical page to map
 122                  */
 123                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 124                         if (agpmem->bound <= baddr &&
 125                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 126                                 break;
 127                 }
 128
 129                 if (!agpmem)
 130                         goto vm_fault_error;
 131
 132                 /*
 133                  * Get the page, inc the use count, and return it
 134                  */
 135                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 136                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
 137                 get_page(page);
 138                 vmf->page = page;
 139
 140                 DRM_DEBUG
 141                     ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
 142                      baddr, __va(agpmem->memory->memory[offset]), offset,
 143                      page_count(page));
 144                 return 0;
 145         }
 146 vm_fault_error:
 147         return VM_FAULT_SIGBUS; /* Disallow mremap */
 148 }
 149 #else                           /* __OS_HAS_AGP */
 150 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 151 {
 152         return VM_FAULT_SIGBUS;
 153 }
 154 #endif                          /* __OS_HAS_AGP */
 155
 156 /**
 157  * \c nopage method for shared virtual memory.
 158  *
 159  * \param vma virtual memory area.
 160  * \param address access address.
 161  * \return pointer to the page structure.
 162  *
 163  * Get the mapping, find the real physical page to map, get the page, and
 164  * return it.
 165  */
 166 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 167 {
 168         struct drm_map *map = (struct drm_map *) vma->vm_private_data;
 169         unsigned long offset;
 170         unsigned long i;
 171         struct page *page;
 172
 173         if (!map)
 174                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 175
 176         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 177         i = (unsigned long)map->handle + offset;
 178         page = vmalloc_to_page((void *)i);
 179         if (!page)
 180                 return VM_FAULT_SIGBUS;
 181         get_page(page);
 182         vmf->page = page;
 183
 184         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 185         return 0;
 186 }
 187
 188 /**
 189  * \c close method for shared virtual memory.
 190  *
 191  * \param vma virtual memory area.
 192  *
 193  * Deletes map information if we are the last
 194  * person to close a mapping and it's not in the global maplist.
 195  */
 196 static void drm_vm_shm_close(struct vm_area_struct *vma)
 197 {
 198         struct drm_file *priv = vma->vm_file->private_data;
 199         struct drm_device *dev = priv->head->dev;
 200         struct drm_vma_entry *pt, *temp;
 201         struct drm_map *map;
 202         struct drm_map_list *r_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         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 213                 if (pt->vma->vm_private_data == map)
 214                         found_maps++;
 215                 if (pt->vma == vma) {
 216                         list_del(&pt->head);
 217                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 218                 }
 219         }
 220
 221         /* We were the only map that was found */
 222         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 223                 /* Check to see if we are in the maplist, if we are not, then
 224                  * we delete this mappings information.
 225                  */
 226                 found_maps = 0;
 227                 list_for_each_entry(r_list, &dev->maplist, head) {
 228                         if (r_list->map == map)
 229                                 found_maps++;
 230                 }
 231
 232                 if (!found_maps) {
 233                         drm_dma_handle_t dmah;
 234
 235                         switch (map->type) {
 236                         case _DRM_REGISTERS:
 237                         case _DRM_FRAME_BUFFER:
 238                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 239                                         int retcode;
 240                                         retcode = mtrr_del(map->mtrr,
 241                                                            map->offset,
 242                                                            map->size);
 243                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 244                                 }
 245                                 iounmap(map->handle);
 246                                 break;
 247                         case _DRM_SHM:
 248                                 vfree(map->handle);
 249                                 break;
 250                         case _DRM_AGP:
 251                         case _DRM_SCATTER_GATHER:
 252                                 break;
 253                         case _DRM_CONSISTENT:
 254                                 dmah.vaddr = map->handle;
 255                                 dmah.busaddr = map->offset;
 256                                 dmah.size = map->size;
 257                                 __drm_pci_free(dev, &dmah);
 258                                 break;
 259                         }
 260                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 261                 }
 262         }
 263         mutex_unlock(&dev->struct_mutex);
 264 }
 265
 266 /**
 267  * \c fault method for DMA virtual memory.
 268  *
 269  * \param vma virtual memory area.
 270  * \param address access address.
 271  * \return pointer to the page structure.
 272  *
 273  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 274  */
 275 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 276 {
 277         struct drm_file *priv = vma->vm_file->private_data;
 278         struct drm_device *dev = priv->head->dev;
 279         struct drm_device_dma *dma = dev->dma;
 280         unsigned long offset;
 281         unsigned long page_nr;
 282         struct page *page;
 283
 284         if (!dma)
 285                 return VM_FAULT_SIGBUS; /* Error */
 286         if (!dma->pagelist)
 287                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 288
 289         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
 290         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 291         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
 292
 293         get_page(page);
 294         vmf->page = page;
 295
 296         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 297         return 0;
 298 }
 299
 300 /**
 301  * \c fault method for scatter-gather virtual memory.
 302  *
 303  * \param vma virtual memory area.
 304  * \param address access address.
 305  * \return pointer to the page structure.
 306  *
 307  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 308  */
 309 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 310 {
 311         struct drm_map *map = (struct drm_map *) vma->vm_private_data;
 312         struct drm_file *priv = vma->vm_file->private_data;
 313         struct drm_device *dev = priv->head->dev;
 314         struct drm_sg_mem *entry = dev->sg;
 315         unsigned long offset;
 316         unsigned long map_offset;
 317         unsigned long page_offset;
 318         struct page *page;
 319
 320         if (!entry)
 321                 return VM_FAULT_SIGBUS; /* Error */
 322         if (!entry->pagelist)
 323                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 324
 325         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 326         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 327         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 328         page = entry->pagelist[page_offset];
 329         get_page(page);
 330         vmf->page = page;
 331
 332         return 0;
 333 }
 334
 335 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 336 {
 337         return drm_do_vm_fault(vma, vmf);
 338 }
 339
 340 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 341 {
 342         return drm_do_vm_shm_fault(vma, vmf);
 343 }
 344
 345 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 346 {
 347         return drm_do_vm_dma_fault(vma, vmf);
 348 }
 349
 350 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 351 {
 352         return drm_do_vm_sg_fault(vma, vmf);
 353 }
 354
 355 /** AGP virtual memory operations */
 356 static struct vm_operations_struct drm_vm_ops = {
 357         .fault = drm_vm_fault,
 358         .open = drm_vm_open,
 359         .close = drm_vm_close,
 360 };
 361
 362 /** Shared virtual memory operations */
 363 static struct vm_operations_struct drm_vm_shm_ops = {
 364         .fault = drm_vm_shm_fault,
 365         .open = drm_vm_open,
 366         .close = drm_vm_shm_close,
 367 };
 368
 369 /** DMA virtual memory operations */
 370 static struct vm_operations_struct drm_vm_dma_ops = {
 371         .fault = drm_vm_dma_fault,
 372         .open = drm_vm_open,
 373         .close = drm_vm_close,
 374 };
 375
 376 /** Scatter-gather virtual memory operations */
 377 static struct vm_operations_struct drm_vm_sg_ops = {
 378         .fault = drm_vm_sg_fault,
 379         .open = drm_vm_open,
 380         .close = drm_vm_close,
 381 };
 382
 383 /**
 384  * \c open method for shared virtual memory.
 385  *
 386  * \param vma virtual memory area.
 387  *
 388  * Create a new drm_vma_entry structure as the \p vma private data entry and
 389  * add it to drm_device::vmalist.
 390  */
 391 static void drm_vm_open_locked(struct vm_area_struct *vma)
 392 {
 393         struct drm_file *priv = vma->vm_file->private_data;
 394         struct drm_device *dev = priv->head->dev;
 395         struct drm_vma_entry *vma_entry;
 396
 397         DRM_DEBUG("0x%08lx,0x%08lx\n",
 398                   vma->vm_start, vma->vm_end - vma->vm_start);
 399         atomic_inc(&dev->vma_count);
 400
 401         vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
 402         if (vma_entry) {
 403                 vma_entry->vma = vma;
 404                 vma_entry->pid = current->pid;
 405                 list_add(&vma_entry->head, &dev->vmalist);
 406         }
 407 }
 408
 409 static void drm_vm_open(struct vm_area_struct *vma)
 410 {
 411         struct drm_file *priv = vma->vm_file->private_data;
 412         struct drm_device *dev = priv->head->dev;
 413
 414         mutex_lock(&dev->struct_mutex);
 415         drm_vm_open_locked(vma);
 416         mutex_unlock(&dev->struct_mutex);
 417 }
 418
 419 /**
 420  * \c close method for all virtual memory types.
 421  *
 422  * \param vma virtual memory area.
 423  *
 424  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 425  * free it.
 426  */
 427 static void drm_vm_close(struct vm_area_struct *vma)
 428 {
 429         struct drm_file *priv = vma->vm_file->private_data;
 430         struct drm_device *dev = priv->head->dev;
 431         struct drm_vma_entry *pt, *temp;
 432
 433         DRM_DEBUG("0x%08lx,0x%08lx\n",
 434                   vma->vm_start, vma->vm_end - vma->vm_start);
 435         atomic_dec(&dev->vma_count);
 436
 437         mutex_lock(&dev->struct_mutex);
 438         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 439                 if (pt->vma == vma) {
 440                         list_del(&pt->head);
 441                         drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 442                         break;
 443                 }
 444         }
 445         mutex_unlock(&dev->struct_mutex);
 446 }
 447
 448 /**
 449  * mmap DMA memory.
 450  *
 451  * \param file_priv DRM file private.
 452  * \param vma virtual memory area.
 453  * \return zero on success or a negative number on failure.
 454  *
 455  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 456  * pointer, and calls vm_open().
 457  */
 458 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 459 {
 460         struct drm_file *priv = filp->private_data;
 461         struct drm_device *dev;
 462         struct drm_device_dma *dma;
 463         unsigned long length = vma->vm_end - vma->vm_start;
 464
 465         dev = priv->head->dev;
 466         dma = dev->dma;
 467         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 468                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 469
 470         /* Length must match exact page count */
 471         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 472                 return -EINVAL;
 473         }
 474
 475         if (!capable(CAP_SYS_ADMIN) &&
 476             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 477                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 478 #if defined(__i386__) || defined(__x86_64__)
 479                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 480 #else
 481                 /* Ye gads this is ugly.  With more thought
 482                    we could move this up higher and use
 483                    `protection_map' instead.  */
 484                 vma->vm_page_prot =
 485                     __pgprot(pte_val
 486                              (pte_wrprotect
 487                               (__pte(pgprot_val(vma->vm_page_prot)))));
 488 #endif
 489         }
 490
 491         vma->vm_ops = &drm_vm_dma_ops;
 492
 493         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 494         vma->vm_flags |= VM_DONTEXPAND;
 495
 496         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 497         drm_vm_open_locked(vma);
 498         return 0;
 499 }
 500
 501 unsigned long drm_core_get_map_ofs(struct drm_map * map)
 502 {
 503         return map->offset;
 504 }
 505
 506 EXPORT_SYMBOL(drm_core_get_map_ofs);
 507
 508 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
 509 {
 510 #ifdef __alpha__
 511         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
 512 #else
 513         return 0;
 514 #endif
 515 }
 516
 517 EXPORT_SYMBOL(drm_core_get_reg_ofs);
 518
 519 /**
 520  * mmap DMA memory.
 521  *
 522  * \param file_priv DRM file private.
 523  * \param vma virtual memory area.
 524  * \return zero on success or a negative number on failure.
 525  *
 526  * If the virtual memory area has no offset associated with it then it's a DMA
 527  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 528  * checks that the restricted flag is not set, sets the virtual memory operations
 529  * according to the mapping type and remaps the pages. Finally sets the file
 530  * pointer and calls vm_open().
 531  */
 532 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 533 {
 534         struct drm_file *priv = filp->private_data;
 535         struct drm_device *dev = priv->head->dev;
 536         struct drm_map *map = NULL;
 537         unsigned long offset = 0;
 538         struct drm_hash_item *hash;
 539
 540         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 541                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 542
 543         if (!priv->authenticated)
 544                 return -EACCES;
 545
 546         /* We check for "dma". On Apple's UniNorth, it's valid to have
 547          * the AGP mapped at physical address 0
 548          * --BenH.
 549          */
 550         if (!vma->vm_pgoff
 551 #if __OS_HAS_AGP
 552             && (!dev->agp
 553                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 554 #endif
 555             )
 556                 return drm_mmap_dma(filp, vma);
 557
 558         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 559                 DRM_ERROR("Could not find map\n");
 560                 return -EINVAL;
 561         }
 562
 563         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 564         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 565                 return -EPERM;
 566
 567         /* Check for valid size. */
 568         if (map->size < vma->vm_end - vma->vm_start)
 569                 return -EINVAL;
 570
 571         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 572                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 573 #if defined(__i386__) || defined(__x86_64__)
 574                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 575 #else
 576                 /* Ye gads this is ugly.  With more thought
 577                    we could move this up higher and use
 578                    `protection_map' instead.  */
 579                 vma->vm_page_prot =
 580                     __pgprot(pte_val
 581                              (pte_wrprotect
 582                               (__pte(pgprot_val(vma->vm_page_prot)))));
 583 #endif
 584         }
 585
 586         switch (map->type) {
 587         case _DRM_AGP:
 588                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
 589                         /*
 590                          * On some platforms we can't talk to bus dma address from the CPU, so for
 591                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 592                          * pages and mappings in fault()
 593                          */
 594 #if defined(__powerpc__)
 595                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 596 #endif
 597                         vma->vm_ops = &drm_vm_ops;
 598                         break;
 599                 }
 600                 /* fall through to _DRM_FRAME_BUFFER... */
 601         case _DRM_FRAME_BUFFER:
 602         case _DRM_REGISTERS:
 603                 offset = dev->driver->get_reg_ofs(dev);
 604                 vma->vm_flags |= VM_IO; /* not in core dump */
 605                 vma->vm_page_prot = drm_io_prot(map->type, vma);
 606 #ifdef __sparc__
 607                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 608 #endif
 609                 if (io_remap_pfn_range(vma, vma->vm_start,
 610                                        (map->offset + offset) >> PAGE_SHIFT,
 611                                        vma->vm_end - vma->vm_start,
 612                                        vma->vm_page_prot))
 613                         return -EAGAIN;
 614                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 615                           " offset = 0x%lx\n",
 616                           map->type,
 617                           vma->vm_start, vma->vm_end, map->offset + offset);
 618                 vma->vm_ops = &drm_vm_ops;
 619                 break;
 620         case _DRM_CONSISTENT:
 621                 /* Consistent memory is really like shared memory. But
 622                  * it's allocated in a different way, so avoid fault */
 623                 if (remap_pfn_range(vma, vma->vm_start,
 624                     page_to_pfn(virt_to_page(map->handle)),
 625                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 626                         return -EAGAIN;
 627         /* fall through to _DRM_SHM */
 628         case _DRM_SHM:
 629                 vma->vm_ops = &drm_vm_shm_ops;
 630                 vma->vm_private_data = (void *)map;
 631                 /* Don't let this area swap.  Change when
 632                    DRM_KERNEL advisory is supported. */
 633                 vma->vm_flags |= VM_RESERVED;
 634                 break;
 635         case _DRM_SCATTER_GATHER:
 636                 vma->vm_ops = &drm_vm_sg_ops;
 637                 vma->vm_private_data = (void *)map;
 638                 vma->vm_flags |= VM_RESERVED;
 639                 break;
 640         default:
 641                 return -EINVAL; /* This should never happen. */
 642         }
 643         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 644         vma->vm_flags |= VM_DONTEXPAND;
 645
 646         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 647         drm_vm_open_locked(vma);
 648         return 0;
 649 }
 650
 651 int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 652 {
 653         struct drm_file *priv = filp->private_data;
 654         struct drm_device *dev = priv->head->dev;
 655         int ret;
 656
 657         mutex_lock(&dev->struct_mutex);
 658         ret = drm_mmap_locked(filp, vma);
 659         mutex_unlock(&dev->struct_mutex);
 660
 661         return ret;
 662 }
 663 EXPORT_SYMBOL(drm_mmap);