drivers/char/drm/drm_vm.h

   1 /**
   2  * \file drm_vm.h
   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
  38 /** AGP virtual memory operations */
  39 struct vm_operations_struct   DRM(vm_ops) = {
  40         .nopage = DRM(vm_nopage),
  41         .open   = DRM(vm_open),
  42         .close  = DRM(vm_close),
  43 };
  44
  45 /** Shared virtual memory operations */
  46 struct vm_operations_struct   DRM(vm_shm_ops) = {
  47         .nopage = DRM(vm_shm_nopage),
  48         .open   = DRM(vm_open),
  49         .close  = DRM(vm_shm_close),
  50 };
  51
  52 /** DMA virtual memory operations */
  53 struct vm_operations_struct   DRM(vm_dma_ops) = {
  54         .nopage = DRM(vm_dma_nopage),
  55         .open   = DRM(vm_open),
  56         .close  = DRM(vm_close),
  57 };
  58
  59 /** Scatter-gather virtual memory operations */
  60 struct vm_operations_struct   DRM(vm_sg_ops) = {
  61         .nopage = DRM(vm_sg_nopage),
  62         .open   = DRM(vm_open),
  63         .close  = DRM(vm_close),
  64 };
  65
  66 /**
  67  * \c nopage method for AGP virtual memory.
  68  *
  69  * \param vma virtual memory area.
  70  * \param address access address.
  71  * \param write_access sharing.
  72  * \return pointer to the page structure.
  73  *
  74  * Find the right map and if it's AGP memory find the real physical page to
  75  * map, get the page, increment the use count and return it.
  76  */
  77 struct page *DRM(vm_nopage)(struct vm_area_struct *vma,
  78                             unsigned long address,
  79                             int *type)
  80 {
  81 #if __REALLY_HAVE_AGP
  82         drm_file_t *priv  = vma->vm_file->private_data;
  83         drm_device_t *dev = priv->dev;
  84         drm_map_t *map    = NULL;
  85         drm_map_list_t  *r_list;
  86         struct list_head *list;
  87
  88         /*
  89          * Find the right map
  90          */
  91
  92         if(!dev->agp || !dev->agp->cant_use_aperture) goto vm_nopage_error;
  93
  94         list_for_each(list, &dev->maplist->head) {
  95                 r_list = list_entry(list, drm_map_list_t, head);
  96                 map = r_list->map;
  97                 if (!map) continue;
  98                 if (map->offset == VM_OFFSET(vma)) break;
  99         }
 100
 101         if (map && map->type == _DRM_AGP) {
 102                 unsigned long offset = address - vma->vm_start;
 103                 unsigned long baddr = VM_OFFSET(vma) + offset;
 104                 struct drm_agp_mem *agpmem;
 105                 struct page *page;
 106
 107 #if __alpha__
 108                 /*
 109                  * Adjust to a bus-relative address
 110                  */
 111                 baddr -= dev->hose->mem_space->start;
 112 #endif
 113
 114                 /*
 115                  * It's AGP memory - find the real physical page to map
 116                  */
 117                 for(agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
 118                         if (agpmem->bound <= baddr &&
 119                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 120                                 break;
 121                 }
 122
 123                 if (!agpmem) goto vm_nopage_error;
 124
 125                 /*
 126                  * Get the page, inc the use count, and return it
 127                  */
 128                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 129                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
 130                 get_page(page);
 131
 132                 DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
 133                           baddr, __va(agpmem->memory->memory[offset]), offset,
 134                           atomic_read(&page->count));
 135
 136                 if (type)
 137                         *type = VM_FAULT_MINOR;
 138                 return page;
 139         }
 140 vm_nopage_error:
 141 #endif /* __REALLY_HAVE_AGP */
 142
 143         return NOPAGE_SIGBUS;           /* Disallow mremap */
 144 }
 145
 146 /**
 147  * \c nopage method for shared virtual memory.
 148  *
 149  * \param vma virtual memory area.
 150  * \param address access address.
 151  * \param write_access sharing.
 152  * \return pointer to the page structure.
 153  *
 154  * Get the the mapping, find the real physical page to map, get the page, and
 155  * return it.
 156  */
 157 struct page *DRM(vm_shm_nopage)(struct vm_area_struct *vma,
 158                                 unsigned long address,
 159                                 int *type)
 160 {
 161         drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
 162         unsigned long    offset;
 163         unsigned long    i;
 164         struct page      *page;
 165
 166         if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
 167         if (!map)                  return NOPAGE_OOM;  /* Nothing allocated */
 168
 169         offset   = address - vma->vm_start;
 170         i = (unsigned long)map->handle + offset;
 171         page = vmalloc_to_page((void *)i);
 172         if (!page)
 173                 return NOPAGE_OOM;
 174         get_page(page);
 175         if (type)
 176                 *type = VM_FAULT_MINOR;
 177
 178         DRM_DEBUG("shm_nopage 0x%lx\n", address);
 179         return page;
 180 }
 181
 182
 183 /**
 184  * \c close method for shared virtual memory.
 185  *
 186  * \param vma virtual memory area.
 187  *
 188  * Deletes map information if we are the last
 189  * person to close a mapping and it's not in the global maplist.
 190  */
 191 void DRM(vm_shm_close)(struct vm_area_struct *vma)
 192 {
 193         drm_file_t      *priv   = vma->vm_file->private_data;
 194         drm_device_t    *dev    = priv->dev;
 195         drm_vma_entry_t *pt, *prev, *next;
 196         drm_map_t *map;
 197         drm_map_list_t *r_list;
 198         struct list_head *list;
 199         int found_maps = 0;
 200
 201         DRM_DEBUG("0x%08lx,0x%08lx\n",
 202                   vma->vm_start, vma->vm_end - vma->vm_start);
 203         atomic_dec(&dev->vma_count);
 204
 205         map = vma->vm_private_data;
 206
 207         down(&dev->struct_sem);
 208         for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
 209                 next = pt->next;
 210                 if (pt->vma->vm_private_data == map) found_maps++;
 211                 if (pt->vma == vma) {
 212                         if (prev) {
 213                                 prev->next = pt->next;
 214                         } else {
 215                                 dev->vmalist = pt->next;
 216                         }
 217                         DRM(free)(pt, sizeof(*pt), DRM_MEM_VMAS);
 218                 } else {
 219                         prev = pt;
 220                 }
 221         }
 222         /* We were the only map that was found */
 223         if(found_maps == 1 &&
 224            map->flags & _DRM_REMOVABLE) {
 225                 /* Check to see if we are in the maplist, if we are not, then
 226                  * we delete this mappings information.
 227                  */
 228                 found_maps = 0;
 229                 list = &dev->maplist->head;
 230                 list_for_each(list, &dev->maplist->head) {
 231                         r_list = list_entry(list, drm_map_list_t, head);
 232                         if (r_list->map == map) found_maps++;
 233                 }
 234
 235                 if(!found_maps) {
 236                         switch (map->type) {
 237                         case _DRM_REGISTERS:
 238                         case _DRM_FRAME_BUFFER:
 239 #if __REALLY_HAVE_MTRR
 240                                 if (map->mtrr >= 0) {
 241                                         int retcode;
 242                                         retcode = mtrr_del(map->mtrr,
 243                                                            map->offset,
 244                                                            map->size);
 245                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 246                                 }
 247 #endif
 248                                 DRM(ioremapfree)(map->handle, map->size, dev);
 249                                 break;
 250                         case _DRM_SHM:
 251                                 vfree(map->handle);
 252                                 break;
 253                         case _DRM_AGP:
 254                         case _DRM_SCATTER_GATHER:
 255                                 break;
 256                         }
 257                         DRM(free)(map, sizeof(*map), DRM_MEM_MAPS);
 258                 }
 259         }
 260         up(&dev->struct_sem);
 261 }
 262
 263 /**
 264  * \c nopage method for DMA virtual memory.
 265  *
 266  * \param vma virtual memory area.
 267  * \param address access address.
 268  * \param write_access sharing.
 269  * \return pointer to the page structure.
 270  *
 271  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 272  */
 273 struct page *DRM(vm_dma_nopage)(struct vm_area_struct *vma,
 274                                 unsigned long address,
 275                                 int *type)
 276 {
 277         drm_file_t       *priv   = vma->vm_file->private_data;
 278         drm_device_t     *dev    = priv->dev;
 279         drm_device_dma_t *dma    = dev->dma;
 280         unsigned long    offset;
 281         unsigned long    page_nr;
 282         struct page      *page;
 283
 284         if (!dma)                  return NOPAGE_SIGBUS; /* Error */
 285         if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
 286         if (!dma->pagelist)        return NOPAGE_OOM ; /* Nothing allocated */
 287
 288         offset   = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
 289         page_nr  = offset >> PAGE_SHIFT;
 290         page = virt_to_page((dma->pagelist[page_nr] +
 291                              (offset & (~PAGE_MASK))));
 292
 293         get_page(page);
 294         if (type)
 295                 *type = VM_FAULT_MINOR;
 296
 297         DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
 298         return page;
 299 }
 300
 301 /**
 302  * \c nopage method for scatter-gather virtual memory.
 303  *
 304  * \param vma virtual memory area.
 305  * \param address access address.
 306  * \param write_access sharing.
 307  * \return pointer to the page structure.
 308  *
 309  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 310  */
 311 struct page *DRM(vm_sg_nopage)(struct vm_area_struct *vma,
 312                                unsigned long address,
 313                                int *type)
 314 {
 315         drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
 316         drm_file_t *priv = vma->vm_file->private_data;
 317         drm_device_t *dev = priv->dev;
 318         drm_sg_mem_t *entry = dev->sg;
 319         unsigned long offset;
 320         unsigned long map_offset;
 321         unsigned long page_offset;
 322         struct page *page;
 323
 324         if (!entry)                return NOPAGE_SIGBUS; /* Error */
 325         if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
 326         if (!entry->pagelist)      return NOPAGE_OOM ;  /* Nothing allocated */
 327
 328
 329         offset = address - vma->vm_start;
 330         map_offset = map->offset - dev->sg->handle;
 331         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 332         page = entry->pagelist[page_offset];
 333         get_page(page);
 334         if (type)
 335                 *type = VM_FAULT_MINOR;
 336
 337         return page;
 338 }
 339
 340 /**
 341  * \c open method for shared virtual memory.
 342  *
 343  * \param vma virtual memory area.
 344  *
 345  * Create a new drm_vma_entry structure as the \p vma private data entry and
 346  * add it to drm_device::vmalist.
 347  */
 348 void DRM(vm_open)(struct vm_area_struct *vma)
 349 {
 350         drm_file_t      *priv   = vma->vm_file->private_data;
 351         drm_device_t    *dev    = priv->dev;
 352         drm_vma_entry_t *vma_entry;
 353
 354         DRM_DEBUG("0x%08lx,0x%08lx\n",
 355                   vma->vm_start, vma->vm_end - vma->vm_start);
 356         atomic_inc(&dev->vma_count);
 357
 358         vma_entry = DRM(alloc)(sizeof(*vma_entry), DRM_MEM_VMAS);
 359         if (vma_entry) {
 360                 down(&dev->struct_sem);
 361                 vma_entry->vma  = vma;
 362                 vma_entry->next = dev->vmalist;
 363                 vma_entry->pid  = current->pid;
 364                 dev->vmalist    = vma_entry;
 365                 up(&dev->struct_sem);
 366         }
 367 }
 368
 369 /**
 370  * \c close method for all virtual memory types.
 371  *
 372  * \param vma virtual memory area.
 373  *
 374  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 375  * free it.
 376  */
 377 void DRM(vm_close)(struct vm_area_struct *vma)
 378 {
 379         drm_file_t      *priv   = vma->vm_file->private_data;
 380         drm_device_t    *dev    = priv->dev;
 381         drm_vma_entry_t *pt, *prev;
 382
 383         DRM_DEBUG("0x%08lx,0x%08lx\n",
 384                   vma->vm_start, vma->vm_end - vma->vm_start);
 385         atomic_dec(&dev->vma_count);
 386
 387         down(&dev->struct_sem);
 388         for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
 389                 if (pt->vma == vma) {
 390                         if (prev) {
 391                                 prev->next = pt->next;
 392                         } else {
 393                                 dev->vmalist = pt->next;
 394                         }
 395                         DRM(free)(pt, sizeof(*pt), DRM_MEM_VMAS);
 396                         break;
 397                 }
 398         }
 399         up(&dev->struct_sem);
 400 }
 401
 402 /**
 403  * mmap DMA memory.
 404  *
 405  * \param filp file pointer.
 406  * \param vma virtual memory area.
 407  * \return zero on success or a negative number on failure.
 408  *
 409  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 410  * pointer, and calls vm_open().
 411  */
 412 int DRM(mmap_dma)(struct file *filp, struct vm_area_struct *vma)
 413 {
 414         drm_file_t       *priv   = filp->private_data;
 415         drm_device_t     *dev;
 416         drm_device_dma_t *dma;
 417         unsigned long    length  = vma->vm_end - vma->vm_start;
 418
 419         lock_kernel();
 420         dev      = priv->dev;
 421         dma      = dev->dma;
 422         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
 423                   vma->vm_start, vma->vm_end, VM_OFFSET(vma));
 424
 425                                 /* Length must match exact page count */
 426         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 427                 unlock_kernel();
 428                 return -EINVAL;
 429         }
 430         unlock_kernel();
 431
 432         vma->vm_ops   = &DRM(vm_dma_ops);
 433
 434 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
 435         vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
 436 #else
 437         vma->vm_flags |= VM_RESERVED; /* Don't swap */
 438 #endif
 439
 440         vma->vm_file  =  filp;  /* Needed for drm_vm_open() */
 441         DRM(vm_open)(vma);
 442         return 0;
 443 }
 444
 445 #ifndef DRIVER_GET_MAP_OFS
 446 #define DRIVER_GET_MAP_OFS()    (map->offset)
 447 #endif
 448
 449 #ifndef DRIVER_GET_REG_OFS
 450 #ifdef __alpha__
 451 #define DRIVER_GET_REG_OFS()    (dev->hose->dense_mem_base -    \
 452                                  dev->hose->mem_space->start)
 453 #else
 454 #define DRIVER_GET_REG_OFS()    0
 455 #endif
 456 #endif
 457
 458 /**
 459  * mmap DMA memory.
 460  *
 461  * \param filp file pointer.
 462  * \param vma virtual memory area.
 463  * \return zero on success or a negative number on failure.
 464  *
 465  * If the virtual memory area has no offset associated with it then it's a DMA
 466  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 467  * checks that the restricted flag is not set, sets the virtual memory operations
 468  * according to the mapping type and remaps the pages. Finally sets the file
 469  * pointer and calls vm_open().
 470  */
 471 int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 472 {
 473         drm_file_t      *priv   = filp->private_data;
 474         drm_device_t    *dev    = priv->dev;
 475         drm_map_t       *map    = NULL;
 476         drm_map_list_t  *r_list;
 477         unsigned long   offset  = 0;
 478         struct list_head *list;
 479
 480         DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
 481                   vma->vm_start, vma->vm_end, VM_OFFSET(vma));
 482
 483         if ( !priv->authenticated ) return -EACCES;
 484
 485         /* We check for "dma". On Apple's UniNorth, it's valid to have
 486          * the AGP mapped at physical address 0
 487          * --BenH.
 488          */
 489         if (!VM_OFFSET(vma)
 490 #if __REALLY_HAVE_AGP
 491             && (!dev->agp || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 492 #endif
 493             )
 494                 return DRM(mmap_dma)(filp, vma);
 495
 496                                 /* A sequential search of a linked list is
 497                                    fine here because: 1) there will only be
 498                                    about 5-10 entries in the list and, 2) a
 499                                    DRI client only has to do this mapping
 500                                    once, so it doesn't have to be optimized
 501                                    for performance, even if the list was a
 502                                    bit longer. */
 503         list_for_each(list, &dev->maplist->head) {
 504                 unsigned long off;
 505
 506                 r_list = list_entry(list, drm_map_list_t, head);
 507                 map = r_list->map;
 508                 if (!map) continue;
 509                 off = DRIVER_GET_MAP_OFS();
 510                 if (off == VM_OFFSET(vma)) break;
 511         }
 512
 513         if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 514                 return -EPERM;
 515
 516                                 /* Check for valid size. */
 517         if (map->size != vma->vm_end - vma->vm_start) return -EINVAL;
 518
 519         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 520                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 521 #if defined(__i386__) || defined(__x86_64__)
 522                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 523 #else
 524                                 /* Ye gads this is ugly.  With more thought
 525                                    we could move this up higher and use
 526                                    `protection_map' instead.  */
 527                 vma->vm_page_prot = __pgprot(pte_val(pte_wrprotect(
 528                         __pte(pgprot_val(vma->vm_page_prot)))));
 529 #endif
 530         }
 531
 532         switch (map->type) {
 533         case _DRM_AGP:
 534 #if __REALLY_HAVE_AGP
 535           if (dev->agp->cant_use_aperture) {
 536                 /*
 537                  * On some platforms we can't talk to bus dma address from the CPU, so for
 538                  * memory of type DRM_AGP, we'll deal with sorting out the real physical
 539                  * pages and mappings in nopage()
 540                  */
 541 #if defined(__powerpc__)
 542                 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 543 #endif
 544                 vma->vm_ops = &DRM(vm_ops);
 545                 break;
 546           }
 547 #endif
 548                 /* fall through to _DRM_FRAME_BUFFER... */
 549         case _DRM_FRAME_BUFFER:
 550         case _DRM_REGISTERS:
 551                 if (VM_OFFSET(vma) >= __pa(high_memory)) {
 552 #if defined(__i386__) || defined(__x86_64__)
 553                         if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
 554                                 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 555                                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
 556                         }
 557 #elif defined(__powerpc__)
 558                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE | _PAGE_GUARDED;
 559 #endif
 560                         vma->vm_flags |= VM_IO; /* not in core dump */
 561                 }
 562 #if defined(__ia64__)
 563                 if (map->type != _DRM_AGP)
 564                         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 565 #endif
 566                 offset = DRIVER_GET_REG_OFS();
 567 #ifdef __sparc__
 568                 if (io_remap_page_range(DRM_RPR_ARG(vma) vma->vm_start,
 569                                         VM_OFFSET(vma) + offset,
 570                                         vma->vm_end - vma->vm_start,
 571                                         vma->vm_page_prot, 0))
 572 #else
 573                 if (remap_page_range(DRM_RPR_ARG(vma) vma->vm_start,
 574                                      VM_OFFSET(vma) + offset,
 575                                      vma->vm_end - vma->vm_start,
 576                                      vma->vm_page_prot))
 577 #endif
 578                                 return -EAGAIN;
 579                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 580                           " offset = 0x%lx\n",
 581                           map->type,
 582                           vma->vm_start, vma->vm_end, VM_OFFSET(vma) + offset);
 583                 vma->vm_ops = &DRM(vm_ops);
 584                 break;
 585         case _DRM_SHM:
 586                 vma->vm_ops = &DRM(vm_shm_ops);
 587                 vma->vm_private_data = (void *)map;
 588                                 /* Don't let this area swap.  Change when
 589                                    DRM_KERNEL advisory is supported. */
 590 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
 591                 vma->vm_flags |= VM_LOCKED;
 592 #else
 593                 vma->vm_flags |= VM_RESERVED;
 594 #endif
 595                 break;
 596         case _DRM_SCATTER_GATHER:
 597                 vma->vm_ops = &DRM(vm_sg_ops);
 598                 vma->vm_private_data = (void *)map;
 599 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
 600                 vma->vm_flags |= VM_LOCKED;
 601 #else
 602                 vma->vm_flags |= VM_RESERVED;
 603 #endif
 604                 break;
 605         default:
 606                 return -EINVAL; /* This should never happen. */
 607         }
 608 #if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
 609         vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
 610 #else
 611         vma->vm_flags |= VM_RESERVED; /* Don't swap */
 612 #endif
 613
 614         vma->vm_file  =  filp;  /* Needed for drm_vm_open() */
 615         DRM(vm_open)(vma);
 616         return 0;
 617 }