linux-core/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
  38 #if defined(__ia64__)
  39 #include <linux/efi.h>
  40 #endif
  41
  42 static void drm_vm_open(struct vm_area_struct *vma);
  43 static void drm_vm_close(struct vm_area_struct *vma);
  44 static int drm_bo_mmap_locked(struct vm_area_struct *vma,
  45                               struct file *filp,
  46                               drm_local_map_t *map);
  47
  48
  49 pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
  50 {
  51         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  52
  53 #if defined(__i386__) || defined(__x86_64__)
  54         if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
  55                 pgprot_val(tmp) |= _PAGE_PCD;
  56                 pgprot_val(tmp) &= ~_PAGE_PWT;
  57         }
  58 #elif defined(__powerpc__)
  59         pgprot_val(tmp) |= _PAGE_NO_CACHE;
  60         if (map_type == _DRM_REGISTERS)
  61                 pgprot_val(tmp) |= _PAGE_GUARDED;
  62 #elif defined(__ia64__)
  63         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
  64                                     vma->vm_start))
  65                 tmp = pgprot_writecombine(tmp);
  66         else
  67                 tmp = pgprot_noncached(tmp);
  68 #elif defined(__sparc__)
  69         tmp = pgprot_noncached(tmp);
  70 #endif
  71         return tmp;
  72 }
  73
  74 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  75 {
  76         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  77
  78 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
  79         tmp |= _PAGE_NO_CACHE;
  80 #endif
  81         return tmp;
  82 }
  83
  84 #ifndef DRM_VM_NOPAGE
  85 /**
  86  * \c fault method for AGP virtual memory.
  87  *
  88  * \param vma virtual memory area.
  89  * \param address access address.
  90  * \return pointer to the page structure.
  91  *
  92  * Find the right map and if it's AGP memory find the real physical page to
  93  * map, get the page, increment the use count and return it.
  94  */
  95 #if __OS_HAS_AGP
  96 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  97 {
  98         struct drm_file *priv = vma->vm_file->private_data;
  99         struct drm_device *dev = priv->minor->dev;
 100         struct drm_map *map = NULL;
 101         struct drm_map_list *r_list;
 102         struct drm_hash_item *hash;
 103
 104         /*
 105          * Find the right map
 106          */
 107         if (!drm_core_has_AGP(dev))
 108                 goto vm_fault_error;
 109
 110         if (!dev->agp || !dev->agp->cant_use_aperture)
 111                 goto vm_fault_error;
 112
 113         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
 114                 goto vm_fault_error;
 115
 116         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 117         map = r_list->map;
 118
 119         if (map && map->type == _DRM_AGP) {
 120                 /*
 121                  * Using vm_pgoff as a selector forces us to use this unusual
 122                  * addressing scheme.
 123                  */
 124                 unsigned long offset = (unsigned long)vmf->virtual_address -
 125                                                                 vma->vm_start;
 126                 unsigned long baddr = map->offset + offset;
 127                 struct drm_agp_mem *agpmem;
 128                 struct page *page;
 129
 130 #ifdef __alpha__
 131                 /*
 132                  * Adjust to a bus-relative address
 133                  */
 134                 baddr -= dev->hose->mem_space->start;
 135 #endif
 136
 137                 /*
 138                  * It's AGP memory - find the real physical page to map
 139                  */
 140                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 141                         if (agpmem->bound <= baddr &&
 142                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 143                                 break;
 144                 }
 145
 146                 if (!agpmem)
 147                         goto vm_fault_error;
 148
 149                 /*
 150                  * Get the page, inc the use count, and return it
 151                  */
 152                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 153                 page = virt_to_page(__va(agpmem->memory->memory[offset]));
 154                 get_page(page);
 155                 vmf->page = page;
 156
 157                 DRM_DEBUG
 158                     ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
 159                      baddr, __va(agpmem->memory->memory[offset]), offset,
 160                      page_count(page));
 161                 return 0;
 162         }
 163 vm_fault_error:
 164         return VM_FAULT_SIGBUS; /* Disallow mremap */
 165 }
 166 #else                           /* __OS_HAS_AGP */
 167 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 168 {
 169         return VM_FAULT_SIGBUS;
 170 }
 171 #endif                          /* __OS_HAS_AGP */
 172
 173 /**
 174  * \c nopage method for shared virtual memory.
 175  *
 176  * \param vma virtual memory area.
 177  * \param address access address.
 178  * \return pointer to the page structure.
 179  *
 180  * Get the mapping, find the real physical page to map, get the page, and
 181  * return it.
 182  */
 183 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 184 {
 185         struct drm_map *map = (struct drm_map *) vma->vm_private_data;
 186         unsigned long offset;
 187         unsigned long i;
 188         struct page *page;
 189
 190         if (!map)
 191                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 192
 193         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 194         i = (unsigned long)map->handle + offset;
 195         page = vmalloc_to_page((void *)i);
 196         if (!page)
 197                 return VM_FAULT_SIGBUS;
 198         get_page(page);
 199         vmf->page = page;
 200
 201         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 202         return 0;
 203 }
 204 #endif
 205
 206 /**
 207  * \c close method for shared virtual memory.
 208  *
 209  * \param vma virtual memory area.
 210  *
 211  * Deletes map information if we are the last
 212  * person to close a mapping and it's not in the global maplist.
 213  */
 214 static void drm_vm_shm_close(struct vm_area_struct *vma)
 215 {
 216         struct drm_file *priv = vma->vm_file->private_data;
 217         struct drm_device *dev = priv->minor->dev;
 218         struct drm_vma_entry *pt, *temp;
 219         struct drm_map *map;
 220         struct drm_map_list *r_list;
 221         int found_maps = 0;
 222
 223         DRM_DEBUG("0x%08lx,0x%08lx\n",
 224                   vma->vm_start, vma->vm_end - vma->vm_start);
 225         atomic_dec(&dev->vma_count);
 226
 227         map = vma->vm_private_data;
 228
 229         mutex_lock(&dev->struct_mutex);
 230         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 231                 if (pt->vma->vm_private_data == map)
 232                         found_maps++;
 233                 if (pt->vma == vma) {
 234                         list_del(&pt->head);
 235                         drm_ctl_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 236                 }
 237         }
 238         /* We were the only map that was found */
 239         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 240                 /* Check to see if we are in the maplist, if we are not, then
 241                  * we delete this mappings information.
 242                  */
 243                 found_maps = 0;
 244                 list_for_each_entry(r_list, &dev->maplist, head) {
 245                         if (r_list->map == map)
 246                                 found_maps++;
 247                 }
 248
 249                 if (!found_maps) {
 250                         drm_dma_handle_t dmah;
 251
 252                         switch (map->type) {
 253                         case _DRM_REGISTERS:
 254                         case _DRM_FRAME_BUFFER:
 255                                 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
 256                                         int retcode;
 257                                         retcode = mtrr_del(map->mtrr,
 258                                                            map->offset,
 259                                                            map->size);
 260                                         DRM_DEBUG("mtrr_del = %d\n", retcode);
 261                                 }
 262                                 iounmap(map->handle);
 263                                 break;
 264                         case _DRM_SHM:
 265                                 vfree(map->handle);
 266                                 break;
 267                         case _DRM_AGP:
 268                         case _DRM_SCATTER_GATHER:
 269                                 break;
 270                         case _DRM_CONSISTENT:
 271                                 dmah.vaddr = map->handle;
 272                                 dmah.busaddr = map->offset;
 273                                 dmah.size = map->size;
 274                                 __drm_pci_free(dev, &dmah);
 275                                 break;
 276                         case _DRM_TTM:
 277                                 BUG_ON(1);
 278                                 break;
 279                         }
 280                         drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 281                 }
 282         }
 283         mutex_unlock(&dev->struct_mutex);
 284 }
 285
 286 #ifndef DRM_VM_NOPAGE
 287 /**
 288  * \c fault method for DMA virtual memory.
 289  *
 290  * \param vma virtual memory area.
 291  * \param address access address.
 292  * \return pointer to the page structure.
 293  *
 294  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 295  */
 296 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 297 {
 298         struct drm_file *priv = vma->vm_file->private_data;
 299         struct drm_device *dev = priv->minor->dev;
 300         struct drm_device_dma *dma = dev->dma;
 301         unsigned long offset;
 302         unsigned long page_nr;
 303         struct page *page;
 304
 305         if (!dma)
 306                 return VM_FAULT_SIGBUS; /* Error */
 307         if (!dma->pagelist)
 308                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 309
 310         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
 311         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 312         page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
 313
 314         get_page(page);
 315         vmf->page = page;
 316
 317         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 318         return 0;
 319 }
 320
 321 /**
 322  * \c fault method for scatter-gather virtual memory.
 323  *
 324  * \param vma virtual memory area.
 325  * \param address access address.
 326  * \return pointer to the page structure.
 327  *
 328  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 329  */
 330 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 331 {
 332         struct drm_map *map = (struct drm_map *) vma->vm_private_data;
 333         struct drm_file *priv = vma->vm_file->private_data;
 334         struct drm_device *dev = priv->minor->dev;
 335         struct drm_sg_mem *entry = dev->sg;
 336         unsigned long offset;
 337         unsigned long map_offset;
 338         unsigned long page_offset;
 339         struct page *page;
 340
 341         if (!entry)
 342                 return VM_FAULT_SIGBUS; /* Error */
 343         if (!entry->pagelist)
 344                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 345
 346         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 347         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 348         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 349         page = entry->pagelist[page_offset];
 350         get_page(page);
 351         vmf->page = page;
 352
 353         return 0;
 354 }
 355 #endif
 356
 357 /** AGP virtual memory operations */
 358 static struct vm_operations_struct drm_vm_ops = {
 359 #ifdef DRM_VM_NOPAGE
 360         .nopage = drm_vm_nopage,
 361 #else
 362         .fault = drm_do_vm_fault,
 363 #endif
 364         .open = drm_vm_open,
 365         .close = drm_vm_close,
 366 };
 367
 368 /** Shared virtual memory operations */
 369 static struct vm_operations_struct drm_vm_shm_ops = {
 370 #ifdef DRM_VM_NOPAGE
 371         .nopage = drm_vm_shm_nopage,
 372 #else
 373         .fault = drm_do_vm_shm_fault,
 374 #endif
 375         .open = drm_vm_open,
 376         .close = drm_vm_shm_close,
 377 };
 378
 379 /** DMA virtual memory operations */
 380 static struct vm_operations_struct drm_vm_dma_ops = {
 381 #ifdef DRM_VM_NOPAGE
 382         .nopage = drm_vm_dma_nopage,
 383 #else
 384         .fault = drm_do_vm_dma_fault,
 385 #endif
 386         .open = drm_vm_open,
 387         .close = drm_vm_close,
 388 };
 389
 390 /** Scatter-gather virtual memory operations */
 391 static struct vm_operations_struct drm_vm_sg_ops = {
 392 #ifdef DRM_VM_NOPAGE
 393         .nopage = drm_vm_sg_nopage,
 394 #else
 395         .fault = drm_do_vm_sg_fault,
 396 #endif
 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 static 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 = drm_ctl_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
 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 /**
 438  * \c close method for all virtual memory types.
 439  *
 440  * \param vma virtual memory area.
 441  *
 442  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 443  * free it.
 444  */
 445 static void drm_vm_close(struct vm_area_struct *vma)
 446 {
 447         struct drm_file *priv = vma->vm_file->private_data;
 448         struct drm_device *dev = priv->minor->dev;
 449         struct drm_vma_entry *pt, *temp;
 450
 451         DRM_DEBUG("0x%08lx,0x%08lx\n",
 452                   vma->vm_start, vma->vm_end - vma->vm_start);
 453         atomic_dec(&dev->vma_count);
 454
 455         mutex_lock(&dev->struct_mutex);
 456         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 457                 if (pt->vma == vma) {
 458                         list_del(&pt->head);
 459                         drm_ctl_free(pt, sizeof(*pt), DRM_MEM_VMAS);
 460                         break;
 461                 }
 462         }
 463         mutex_unlock(&dev->struct_mutex);
 464 }
 465
 466
 467 /**
 468  * mmap DMA memory.
 469  *
 470  * \param file_priv DRM file private.
 471  * \param vma virtual memory area.
 472  * \return zero on success or a negative number on failure.
 473  *
 474  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 475  * pointer, and calls vm_open().
 476  */
 477 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 478 {
 479         struct drm_file *priv = filp->private_data;
 480         struct drm_device *dev;
 481         struct drm_device_dma *dma;
 482         unsigned long length = vma->vm_end - vma->vm_start;
 483
 484         dev = priv->minor->dev;
 485         dma = dev->dma;
 486         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 487                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 488
 489         /* Length must match exact page count */
 490         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 491                 return -EINVAL;
 492         }
 493
 494         if (!capable(CAP_SYS_ADMIN) && (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 495                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 496 #if defined(__i386__) || defined(__x86_64__)
 497                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 498 #else
 499                 /* Ye gads this is ugly.  With more thought
 500                    we could move this up higher and use
 501                    `protection_map' instead.  */
 502                 vma->vm_page_prot =
 503                     __pgprot(pte_val
 504                              (pte_wrprotect
 505                               (__pte(pgprot_val(vma->vm_page_prot)))));
 506 #endif
 507         }
 508
 509         vma->vm_ops = &drm_vm_dma_ops;
 510         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 511
 512         vma->vm_file = filp;    /* Needed for drm_vm_open() */
 513         drm_vm_open_locked(vma);
 514         return 0;
 515 }
 516
 517 unsigned long drm_core_get_map_ofs(struct drm_map * map)
 518 {
 519         return map->offset;
 520 }
 521 EXPORT_SYMBOL(drm_core_get_map_ofs);
 522
 523 unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
 524 {
 525 #ifdef __alpha__
 526         return dev->hose->dense_mem_base - dev->hose->mem_space->start;
 527 #else
 528         return 0;
 529 #endif
 530 }
 531 EXPORT_SYMBOL(drm_core_get_reg_ofs);
 532
 533 /**
 534  * mmap DMA memory.
 535  *
 536  * \param file_priv DRM file private.
 537  * \param vma virtual memory area.
 538  * \return zero on success or a negative number on failure.
 539  *
 540  * If the virtual memory area has no offset associated with it then it's a DMA
 541  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 542  * checks that the restricted flag is not set, sets the virtual memory operations
 543  * according to the mapping type and remaps the pages. Finally sets the file
 544  * pointer and calls vm_open().
 545  */
 546 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 547 {
 548         struct drm_file *priv = filp->private_data;
 549         struct drm_device *dev = priv->minor->dev;
 550         struct drm_map *map = NULL;
 551         unsigned long offset = 0;
 552         struct drm_hash_item *hash;
 553
 554         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 555                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 556
 557         if (!priv->authenticated)
 558                 return -EACCES;
 559
 560         /* We check for "dma". On Apple's UniNorth, it's valid to have
 561          * the AGP mapped at physical address 0
 562          * --BenH.
 563          */
 564
 565         if (!vma->vm_pgoff
 566 #if __OS_HAS_AGP
 567             && (!dev->agp
 568                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 569 #endif
 570             )
 571                 return drm_mmap_dma(filp, vma);
 572
 573         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 574                 DRM_ERROR("Could not find map\n");
 575                 return -EINVAL;
 576         }
 577
 578         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 579         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 580                 return -EPERM;
 581
 582         /* Check for valid size. */
 583         if (map->size < vma->vm_end - vma->vm_start)
 584                 return -EINVAL;
 585
 586         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 587                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 588 #if defined(__i386__) || defined(__x86_64__)
 589                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 590 #else
 591                 /* Ye gads this is ugly.  With more thought
 592                    we could move this up higher and use
 593                    `protection_map' instead.  */
 594                 vma->vm_page_prot =
 595                     __pgprot(pte_val
 596                              (pte_wrprotect
 597                               (__pte(pgprot_val(vma->vm_page_prot)))));
 598 #endif
 599         }
 600
 601         switch (map->type) {
 602         case _DRM_AGP:
 603                 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
 604                         /*
 605                          * On some platforms we can't talk to bus dma address from the CPU, so for
 606                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 607                          * pages and mappings in nopage()
 608                          */
 609 #if defined(__powerpc__)
 610                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 611 #endif
 612                         vma->vm_ops = &drm_vm_ops;
 613                         break;
 614                 }
 615                 /* fall through to _DRM_FRAME_BUFFER... */
 616         case _DRM_FRAME_BUFFER:
 617         case _DRM_REGISTERS:
 618                 offset = dev->driver->get_reg_ofs(dev);
 619                 vma->vm_flags |= VM_IO; /* not in core dump */
 620                 vma->vm_page_prot = drm_io_prot(map->type, vma);
 621                 if (io_remap_pfn_range(vma, vma->vm_start,
 622                                        (map->offset + offset) >> PAGE_SHIFT,
 623                                        vma->vm_end - vma->vm_start,
 624                                        vma->vm_page_prot))
 625                         return -EAGAIN;
 626                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 627                           " offset = 0x%lx\n",
 628                           map->type,
 629                           vma->vm_start, vma->vm_end, map->offset + offset);
 630                 vma->vm_ops = &drm_vm_ops;
 631                 break;
 632         case _DRM_CONSISTENT:
 633                 /* Consistent memory is really like shared memory. But
 634                  * it's allocated in a different way, so avoid nopage */
 635                 if (remap_pfn_range(vma, vma->vm_start,
 636                     page_to_pfn(virt_to_page(map->handle)),
 637                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 638                         return -EAGAIN;
 639                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 640         /* fall through to _DRM_SHM */
 641         case _DRM_SHM:
 642                 vma->vm_ops = &drm_vm_shm_ops;
 643                 vma->vm_private_data = (void *)map;
 644                 /* Don't let this area swap.  Change when
 645                    DRM_KERNEL advisory is supported. */
 646                 vma->vm_flags |= VM_RESERVED;
 647                 break;
 648         case _DRM_SCATTER_GATHER:
 649                 vma->vm_ops = &drm_vm_sg_ops;
 650                 vma->vm_private_data = (void *)map;
 651                 vma->vm_flags |= VM_RESERVED;
 652                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 653                 break;
 654         case _DRM_TTM:
 655                 return drm_bo_mmap_locked(vma, filp, map);
 656         default:
 657                 return -EINVAL; /* This should never happen. */
 658         }
 659         vma->vm_flags |= VM_RESERVED;   /* Don't swap */
 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);
 679
 680 /**
 681  * buffer object vm functions.
 682  */
 683
 684 /**
 685  * \c Pagefault method for buffer objects.
 686  *
 687  * \param vma Virtual memory area.
 688  * \param address File offset.
 689  * \return Error or refault. The pfn is manually inserted.
 690  *
 691  * It's important that pfns are inserted while holding the bo->mutex lock.
 692  * otherwise we might race with unmap_mapping_range() which is always
 693  * called with the bo->mutex lock held.
 694  *
 695  * We're modifying the page attribute bits of the vma->vm_page_prot field,
 696  * without holding the mmap_sem in write mode. Only in read mode.
 697  * These bits are not used by the mm subsystem code, and we consider them
 698  * protected by the bo->mutex lock.
 699  */
 700
 701 #ifdef DRM_FULL_MM_COMPAT
 702 static unsigned long drm_bo_vm_nopfn(struct vm_area_struct *vma,
 703                                      unsigned long address)
 704 {
 705         struct drm_buffer_object *bo = (struct drm_buffer_object *) vma->vm_private_data;
 706         unsigned long page_offset;
 707         struct page *page = NULL;
 708         struct drm_ttm *ttm;
 709         struct drm_device *dev;
 710         unsigned long pfn;
 711         int err;
 712         unsigned long bus_base;
 713         unsigned long bus_offset;
 714         unsigned long bus_size;
 715         unsigned long ret = NOPFN_REFAULT;
 716
 717         if (address > vma->vm_end)
 718                 return NOPFN_SIGBUS;
 719
 720         dev = bo->dev;
 721         err = drm_bo_read_lock(&dev->bm.bm_lock, 1);
 722         if (err)
 723                 return NOPFN_REFAULT;
 724
 725         err = mutex_lock_interruptible(&bo->mutex);
 726         if (err) {
 727                 drm_bo_read_unlock(&dev->bm.bm_lock);
 728                 return NOPFN_REFAULT;
 729         }
 730
 731         err = drm_bo_wait(bo, 0, 1, 0, 1);
 732         if (err) {
 733                 ret = (err != -EAGAIN) ? NOPFN_SIGBUS : NOPFN_REFAULT;
 734                 bo->priv_flags &= ~_DRM_BO_FLAG_UNLOCKED;
 735                 goto out_unlock;
 736         }
 737
 738         bo->priv_flags &= ~_DRM_BO_FLAG_UNLOCKED;
 739
 740         /*
 741          * If buffer happens to be in a non-mappable location,
 742          * move it to a mappable.
 743          */
 744
 745         if (!(bo->mem.flags & DRM_BO_FLAG_MAPPABLE)) {
 746                 uint32_t new_flags = bo->mem.proposed_flags |
 747                         DRM_BO_FLAG_MAPPABLE |
 748                         DRM_BO_FLAG_FORCE_MAPPABLE;
 749                 err = drm_bo_move_buffer(bo, new_flags, 0, 0);
 750                 if (err) {
 751                         ret = (err != -EAGAIN) ? NOPFN_SIGBUS : NOPFN_REFAULT;
 752                         goto out_unlock;
 753                 }
 754         }
 755
 756         err = drm_bo_pci_offset(dev, &bo->mem, &bus_base, &bus_offset,
 757                                 &bus_size);
 758
 759         if (err) {
 760                 ret = NOPFN_SIGBUS;
 761                 goto out_unlock;
 762         }
 763
 764         page_offset = (address - vma->vm_start) >> PAGE_SHIFT;
 765
 766         if (bus_size) {
 767                 struct drm_mem_type_manager *man = &dev->bm.man[bo->mem.mem_type];
 768
 769                 pfn = ((bus_base + bus_offset) >> PAGE_SHIFT) + page_offset;
 770                 vma->vm_page_prot = drm_io_prot(man->drm_bus_maptype, vma);
 771         } else {
 772                 ttm = bo->ttm;
 773
 774                 drm_ttm_fixup_caching(ttm);
 775                 page = drm_ttm_get_page(ttm, page_offset);
 776                 if (!page) {
 777                         ret = NOPFN_OOM;
 778                         goto out_unlock;
 779                 }
 780                 pfn = page_to_pfn(page);
 781                 vma->vm_page_prot = (bo->mem.flags & DRM_BO_FLAG_CACHED) ?
 782                         vm_get_page_prot(vma->vm_flags) :
 783                         drm_io_prot(_DRM_TTM, vma);
 784         }
 785
 786         err = vm_insert_pfn(vma, address, pfn);
 787         if (err) {
 788                 ret = (err != -EAGAIN) ? NOPFN_OOM : NOPFN_REFAULT;
 789                 goto out_unlock;
 790         }
 791 out_unlock:
 792         BUG_ON(bo->priv_flags & _DRM_BO_FLAG_UNLOCKED);
 793         mutex_unlock(&bo->mutex);
 794         drm_bo_read_unlock(&dev->bm.bm_lock);
 795         return ret;
 796 }
 797 #endif
 798
 799 static void drm_bo_vm_open_locked(struct vm_area_struct *vma)
 800 {
 801         struct drm_buffer_object *bo = (struct drm_buffer_object *) vma->vm_private_data;
 802
 803         drm_vm_open_locked(vma);
 804         atomic_inc(&bo->usage);
 805 #ifdef DRM_ODD_MM_COMPAT
 806         drm_bo_add_vma(bo, vma);
 807 #endif
 808 }
 809
 810 /**
 811  * \c vma open method for buffer objects.
 812  *
 813  * \param vma virtual memory area.
 814  */
 815
 816 static void drm_bo_vm_open(struct vm_area_struct *vma)
 817 {
 818         struct drm_buffer_object *bo = (struct drm_buffer_object *) vma->vm_private_data;
 819         struct drm_device *dev = bo->dev;
 820
 821         mutex_lock(&dev->struct_mutex);
 822         drm_bo_vm_open_locked(vma);
 823         mutex_unlock(&dev->struct_mutex);
 824 }
 825
 826 /**
 827  * \c vma close method for buffer objects.
 828  *
 829  * \param vma virtual memory area.
 830  */
 831
 832 static void drm_bo_vm_close(struct vm_area_struct *vma)
 833 {
 834         struct drm_buffer_object *bo = (struct drm_buffer_object *) vma->vm_private_data;
 835         struct drm_device *dev = bo->dev;
 836
 837         drm_vm_close(vma);
 838         if (bo) {
 839                 mutex_lock(&dev->struct_mutex);
 840 #ifdef DRM_ODD_MM_COMPAT
 841                 drm_bo_delete_vma(bo, vma);
 842 #endif
 843                 drm_bo_usage_deref_locked((struct drm_buffer_object **)
 844                                           &vma->vm_private_data);
 845                 mutex_unlock(&dev->struct_mutex);
 846         }
 847         return;
 848 }
 849
 850 static struct vm_operations_struct drm_bo_vm_ops = {
 851 #ifdef DRM_FULL_MM_COMPAT
 852         .nopfn = drm_bo_vm_nopfn,
 853 #else
 854 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19))
 855         .nopfn = drm_bo_vm_nopfn,
 856 #else
 857         .nopage = drm_bo_vm_nopage,
 858 #endif
 859 #endif
 860         .open = drm_bo_vm_open,
 861         .close = drm_bo_vm_close,
 862 };
 863
 864 /**
 865  * mmap buffer object memory.
 866  *
 867  * \param vma virtual memory area.
 868  * \param file_priv DRM file private.
 869  * \param map The buffer object drm map.
 870  * \return zero on success or a negative number on failure.
 871  */
 872
 873 int drm_bo_mmap_locked(struct vm_area_struct *vma,
 874                        struct file *filp,
 875                        drm_local_map_t *map)
 876 {
 877         vma->vm_ops = &drm_bo_vm_ops;
 878         vma->vm_private_data = map->handle;
 879         vma->vm_file = filp;
 880         vma->vm_flags |= VM_RESERVED | VM_IO;
 881 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,19))
 882         vma->vm_flags |= VM_PFNMAP;
 883 #endif
 884         drm_bo_vm_open_locked(vma);
 885 #ifdef DRM_ODD_MM_COMPAT
 886         drm_bo_map_bound(vma);
 887 #endif
 888         return 0;
 889 }