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 <drm/drmP.h>
  37 #include <linux/export.h>
  38 #include <linux/seq_file.h>
  39 #if defined(__ia64__)
  40 #include <linux/efi.h>
  41 #include <linux/slab.h>
  42 #endif
  43 #include <asm/pgtable.h>
  44 #include "drm_legacy.h"
  45
  46 struct drm_vma_entry {
  47         struct list_head head;
  48         struct vm_area_struct *vma;
  49         pid_t pid;
  50 };
  51
  52 static void drm_vm_open(struct vm_area_struct *vma);
  53 static void drm_vm_close(struct vm_area_struct *vma);
  54
  55 static pgprot_t drm_io_prot(struct drm_local_map *map,
  56                             struct vm_area_struct *vma)
  57 {
  58         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  59
  60 #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__)
  61         if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
  62                 tmp = pgprot_noncached(tmp);
  63         else
  64                 tmp = pgprot_writecombine(tmp);
  65 #elif defined(__ia64__)
  66         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
  67                                     vma->vm_start))
  68                 tmp = pgprot_writecombine(tmp);
  69         else
  70                 tmp = pgprot_noncached(tmp);
  71 #elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
  72         tmp = pgprot_noncached(tmp);
  73 #endif
  74         return tmp;
  75 }
  76
  77 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  78 {
  79         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  80
  81 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
  82         tmp |= _PAGE_NO_CACHE;
  83 #endif
  84         return tmp;
  85 }
  86
  87 /**
  88  * \c fault method for AGP virtual memory.
  89  *
  90  * \param vma virtual memory area.
  91  * \param address access address.
  92  * \return pointer to the page structure.
  93  *
  94  * Find the right map and if it's AGP memory find the real physical page to
  95  * map, get the page, increment the use count and return it.
  96  */
  97 #if __OS_HAS_AGP
  98 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
  99 {
 100         struct drm_file *priv = vma->vm_file->private_data;
 101         struct drm_device *dev = priv->minor->dev;
 102         struct drm_local_map *map = NULL;
 103         struct drm_map_list *r_list;
 104         struct drm_hash_item *hash;
 105
 106         /*
 107          * Find the right map
 108          */
 109         if (!dev->agp)
 110                 goto vm_fault_error;
 111
 112         if (!dev->agp || !dev->agp->cant_use_aperture)
 113                 goto vm_fault_error;
 114
 115         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
 116                 goto vm_fault_error;
 117
 118         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 119         map = r_list->map;
 120
 121         if (map && map->type == _DRM_AGP) {
 122                 /*
 123                  * Using vm_pgoff as a selector forces us to use this unusual
 124                  * addressing scheme.
 125                  */
 126                 resource_size_t offset = (unsigned long)vmf->virtual_address -
 127                         vma->vm_start;
 128                 resource_size_t baddr = map->offset + offset;
 129                 struct drm_agp_mem *agpmem;
 130                 struct page *page;
 131
 132 #ifdef __alpha__
 133                 /*
 134                  * Adjust to a bus-relative address
 135                  */
 136                 baddr -= dev->hose->mem_space->start;
 137 #endif
 138
 139                 /*
 140                  * It's AGP memory - find the real physical page to map
 141                  */
 142                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 143                         if (agpmem->bound <= baddr &&
 144                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 145                                 break;
 146                 }
 147
 148                 if (&agpmem->head == &dev->agp->memory)
 149                         goto vm_fault_error;
 150
 151                 /*
 152                  * Get the page, inc the use count, and return it
 153                  */
 154                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 155                 page = agpmem->memory->pages[offset];
 156                 get_page(page);
 157                 vmf->page = page;
 158
 159                 DRM_DEBUG
 160                     ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
 161                      (unsigned long long)baddr,
 162                      agpmem->memory->pages[offset],
 163                      (unsigned long long)offset,
 164                      page_count(page));
 165                 return 0;
 166         }
 167 vm_fault_error:
 168         return VM_FAULT_SIGBUS; /* Disallow mremap */
 169 }
 170 #else                           /* __OS_HAS_AGP */
 171 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 172 {
 173         return VM_FAULT_SIGBUS;
 174 }
 175 #endif                          /* __OS_HAS_AGP */
 176
 177 /**
 178  * \c nopage method for shared virtual memory.
 179  *
 180  * \param vma virtual memory area.
 181  * \param address access address.
 182  * \return pointer to the page structure.
 183  *
 184  * Get the mapping, find the real physical page to map, get the page, and
 185  * return it.
 186  */
 187 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 188 {
 189         struct drm_local_map *map = vma->vm_private_data;
 190         unsigned long offset;
 191         unsigned long i;
 192         struct page *page;
 193
 194         if (!map)
 195                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 196
 197         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 198         i = (unsigned long)map->handle + offset;
 199         page = vmalloc_to_page((void *)i);
 200         if (!page)
 201                 return VM_FAULT_SIGBUS;
 202         get_page(page);
 203         vmf->page = page;
 204
 205         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 206         return 0;
 207 }
 208
 209 /**
 210  * \c close method for shared virtual memory.
 211  *
 212  * \param vma virtual memory area.
 213  *
 214  * Deletes map information if we are the last
 215  * person to close a mapping and it's not in the global maplist.
 216  */
 217 static void drm_vm_shm_close(struct vm_area_struct *vma)
 218 {
 219         struct drm_file *priv = vma->vm_file->private_data;
 220         struct drm_device *dev = priv->minor->dev;
 221         struct drm_vma_entry *pt, *temp;
 222         struct drm_local_map *map;
 223         struct drm_map_list *r_list;
 224         int found_maps = 0;
 225
 226         DRM_DEBUG("0x%08lx,0x%08lx\n",
 227                   vma->vm_start, vma->vm_end - vma->vm_start);
 228
 229         map = vma->vm_private_data;
 230
 231         mutex_lock(&dev->struct_mutex);
 232         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 233                 if (pt->vma->vm_private_data == map)
 234                         found_maps++;
 235                 if (pt->vma == vma) {
 236                         list_del(&pt->head);
 237                         kfree(pt);
 238                 }
 239         }
 240
 241         /* We were the only map that was found */
 242         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 243                 /* Check to see if we are in the maplist, if we are not, then
 244                  * we delete this mappings information.
 245                  */
 246                 found_maps = 0;
 247                 list_for_each_entry(r_list, &dev->maplist, head) {
 248                         if (r_list->map == map)
 249                                 found_maps++;
 250                 }
 251
 252                 if (!found_maps) {
 253                         drm_dma_handle_t dmah;
 254
 255                         switch (map->type) {
 256                         case _DRM_REGISTERS:
 257                         case _DRM_FRAME_BUFFER:
 258                                 arch_phys_wc_del(map->mtrr);
 259                                 iounmap(map->handle);
 260                                 break;
 261                         case _DRM_SHM:
 262                                 vfree(map->handle);
 263                                 break;
 264                         case _DRM_AGP:
 265                         case _DRM_SCATTER_GATHER:
 266                                 break;
 267                         case _DRM_CONSISTENT:
 268                                 dmah.vaddr = map->handle;
 269                                 dmah.busaddr = map->offset;
 270                                 dmah.size = map->size;
 271                                 __drm_legacy_pci_free(dev, &dmah);
 272                                 break;
 273                         }
 274                         kfree(map);
 275                 }
 276         }
 277         mutex_unlock(&dev->struct_mutex);
 278 }
 279
 280 /**
 281  * \c fault method for DMA virtual memory.
 282  *
 283  * \param vma virtual memory area.
 284  * \param address access address.
 285  * \return pointer to the page structure.
 286  *
 287  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 288  */
 289 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 290 {
 291         struct drm_file *priv = vma->vm_file->private_data;
 292         struct drm_device *dev = priv->minor->dev;
 293         struct drm_device_dma *dma = dev->dma;
 294         unsigned long offset;
 295         unsigned long page_nr;
 296         struct page *page;
 297
 298         if (!dma)
 299                 return VM_FAULT_SIGBUS; /* Error */
 300         if (!dma->pagelist)
 301                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 302
 303         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
 304         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 305         page = virt_to_page((void *)dma->pagelist[page_nr]);
 306
 307         get_page(page);
 308         vmf->page = page;
 309
 310         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 311         return 0;
 312 }
 313
 314 /**
 315  * \c fault method for scatter-gather virtual memory.
 316  *
 317  * \param vma virtual memory area.
 318  * \param address access address.
 319  * \return pointer to the page structure.
 320  *
 321  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 322  */
 323 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 324 {
 325         struct drm_local_map *map = vma->vm_private_data;
 326         struct drm_file *priv = vma->vm_file->private_data;
 327         struct drm_device *dev = priv->minor->dev;
 328         struct drm_sg_mem *entry = dev->sg;
 329         unsigned long offset;
 330         unsigned long map_offset;
 331         unsigned long page_offset;
 332         struct page *page;
 333
 334         if (!entry)
 335                 return VM_FAULT_SIGBUS; /* Error */
 336         if (!entry->pagelist)
 337                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 338
 339         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 340         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 341         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 342         page = entry->pagelist[page_offset];
 343         get_page(page);
 344         vmf->page = page;
 345
 346         return 0;
 347 }
 348
 349 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 350 {
 351         return drm_do_vm_fault(vma, vmf);
 352 }
 353
 354 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 355 {
 356         return drm_do_vm_shm_fault(vma, vmf);
 357 }
 358
 359 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 360 {
 361         return drm_do_vm_dma_fault(vma, vmf);
 362 }
 363
 364 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 365 {
 366         return drm_do_vm_sg_fault(vma, vmf);
 367 }
 368
 369 /** AGP virtual memory operations */
 370 static const struct vm_operations_struct drm_vm_ops = {
 371         .fault = drm_vm_fault,
 372         .open = drm_vm_open,
 373         .close = drm_vm_close,
 374 };
 375
 376 /** Shared virtual memory operations */
 377 static const struct vm_operations_struct drm_vm_shm_ops = {
 378         .fault = drm_vm_shm_fault,
 379         .open = drm_vm_open,
 380         .close = drm_vm_shm_close,
 381 };
 382
 383 /** DMA virtual memory operations */
 384 static const struct vm_operations_struct drm_vm_dma_ops = {
 385         .fault = drm_vm_dma_fault,
 386         .open = drm_vm_open,
 387         .close = drm_vm_close,
 388 };
 389
 390 /** Scatter-gather virtual memory operations */
 391 static const struct vm_operations_struct drm_vm_sg_ops = {
 392         .fault = drm_vm_sg_fault,
 393         .open = drm_vm_open,
 394         .close = drm_vm_close,
 395 };
 396
 397 /**
 398  * \c open method for shared virtual memory.
 399  *
 400  * \param vma virtual memory area.
 401  *
 402  * Create a new drm_vma_entry structure as the \p vma private data entry and
 403  * add it to drm_device::vmalist.
 404  */
 405 void drm_vm_open_locked(struct drm_device *dev,
 406                 struct vm_area_struct *vma)
 407 {
 408         struct drm_vma_entry *vma_entry;
 409
 410         DRM_DEBUG("0x%08lx,0x%08lx\n",
 411                   vma->vm_start, vma->vm_end - vma->vm_start);
 412
 413         vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 414         if (vma_entry) {
 415                 vma_entry->vma = vma;
 416                 vma_entry->pid = current->pid;
 417                 list_add(&vma_entry->head, &dev->vmalist);
 418         }
 419 }
 420
 421 static void drm_vm_open(struct vm_area_struct *vma)
 422 {
 423         struct drm_file *priv = vma->vm_file->private_data;
 424         struct drm_device *dev = priv->minor->dev;
 425
 426         mutex_lock(&dev->struct_mutex);
 427         drm_vm_open_locked(dev, vma);
 428         mutex_unlock(&dev->struct_mutex);
 429 }
 430
 431 void drm_vm_close_locked(struct drm_device *dev,
 432                 struct vm_area_struct *vma)
 433 {
 434         struct drm_vma_entry *pt, *temp;
 435
 436         DRM_DEBUG("0x%08lx,0x%08lx\n",
 437                   vma->vm_start, vma->vm_end - vma->vm_start);
 438
 439         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 440                 if (pt->vma == vma) {
 441                         list_del(&pt->head);
 442                         kfree(pt);
 443                         break;
 444                 }
 445         }
 446 }
 447
 448 /**
 449  * \c close method for all virtual memory types.
 450  *
 451  * \param vma virtual memory area.
 452  *
 453  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 454  * free it.
 455  */
 456 static void drm_vm_close(struct vm_area_struct *vma)
 457 {
 458         struct drm_file *priv = vma->vm_file->private_data;
 459         struct drm_device *dev = priv->minor->dev;
 460
 461         mutex_lock(&dev->struct_mutex);
 462         drm_vm_close_locked(dev, vma);
 463         mutex_unlock(&dev->struct_mutex);
 464 }
 465
 466 /**
 467  * mmap DMA memory.
 468  *
 469  * \param file_priv DRM file private.
 470  * \param vma virtual memory area.
 471  * \return zero on success or a negative number on failure.
 472  *
 473  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 474  * pointer, and calls vm_open().
 475  */
 476 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 477 {
 478         struct drm_file *priv = filp->private_data;
 479         struct drm_device *dev;
 480         struct drm_device_dma *dma;
 481         unsigned long length = vma->vm_end - vma->vm_start;
 482
 483         dev = priv->minor->dev;
 484         dma = dev->dma;
 485         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 486                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 487
 488         /* Length must match exact page count */
 489         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 490                 return -EINVAL;
 491         }
 492
 493         if (!capable(CAP_SYS_ADMIN) &&
 494             (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
 511         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 512
 513         drm_vm_open_locked(dev, vma);
 514         return 0;
 515 }
 516
 517 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 518 {
 519 #ifdef __alpha__
 520         return dev->hose->dense_mem_base;
 521 #else
 522         return 0;
 523 #endif
 524 }
 525
 526 /**
 527  * mmap DMA memory.
 528  *
 529  * \param file_priv DRM file private.
 530  * \param vma virtual memory area.
 531  * \return zero on success or a negative number on failure.
 532  *
 533  * If the virtual memory area has no offset associated with it then it's a DMA
 534  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 535  * checks that the restricted flag is not set, sets the virtual memory operations
 536  * according to the mapping type and remaps the pages. Finally sets the file
 537  * pointer and calls vm_open().
 538  */
 539 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 540 {
 541         struct drm_file *priv = filp->private_data;
 542         struct drm_device *dev = priv->minor->dev;
 543         struct drm_local_map *map = NULL;
 544         resource_size_t offset = 0;
 545         struct drm_hash_item *hash;
 546
 547         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 548                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 549
 550         if (!priv->authenticated)
 551                 return -EACCES;
 552
 553         /* We check for "dma". On Apple's UniNorth, it's valid to have
 554          * the AGP mapped at physical address 0
 555          * --BenH.
 556          */
 557         if (!vma->vm_pgoff
 558 #if __OS_HAS_AGP
 559             && (!dev->agp
 560                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 561 #endif
 562             )
 563                 return drm_mmap_dma(filp, vma);
 564
 565         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 566                 DRM_ERROR("Could not find map\n");
 567                 return -EINVAL;
 568         }
 569
 570         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 571         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 572                 return -EPERM;
 573
 574         /* Check for valid size. */
 575         if (map->size < vma->vm_end - vma->vm_start)
 576                 return -EINVAL;
 577
 578         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 579                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 580 #if defined(__i386__) || defined(__x86_64__)
 581                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 582 #else
 583                 /* Ye gads this is ugly.  With more thought
 584                    we could move this up higher and use
 585                    `protection_map' instead.  */
 586                 vma->vm_page_prot =
 587                     __pgprot(pte_val
 588                              (pte_wrprotect
 589                               (__pte(pgprot_val(vma->vm_page_prot)))));
 590 #endif
 591         }
 592
 593         switch (map->type) {
 594 #if !defined(__arm__)
 595         case _DRM_AGP:
 596                 if (dev->agp && dev->agp->cant_use_aperture) {
 597                         /*
 598                          * On some platforms we can't talk to bus dma address from the CPU, so for
 599                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 600                          * pages and mappings in fault()
 601                          */
 602 #if defined(__powerpc__)
 603                         pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 604 #endif
 605                         vma->vm_ops = &drm_vm_ops;
 606                         break;
 607                 }
 608                 /* fall through to _DRM_FRAME_BUFFER... */
 609 #endif
 610         case _DRM_FRAME_BUFFER:
 611         case _DRM_REGISTERS:
 612                 offset = drm_core_get_reg_ofs(dev);
 613                 vma->vm_page_prot = drm_io_prot(map, vma);
 614                 if (io_remap_pfn_range(vma, vma->vm_start,
 615                                        (map->offset + offset) >> PAGE_SHIFT,
 616                                        vma->vm_end - vma->vm_start,
 617                                        vma->vm_page_prot))
 618                         return -EAGAIN;
 619                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 620                           " offset = 0x%llx\n",
 621                           map->type,
 622                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
 623
 624                 vma->vm_ops = &drm_vm_ops;
 625                 break;
 626         case _DRM_CONSISTENT:
 627                 /* Consistent memory is really like shared memory. But
 628                  * it's allocated in a different way, so avoid fault */
 629                 if (remap_pfn_range(vma, vma->vm_start,
 630                     page_to_pfn(virt_to_page(map->handle)),
 631                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 632                         return -EAGAIN;
 633                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 634         /* fall through to _DRM_SHM */
 635         case _DRM_SHM:
 636                 vma->vm_ops = &drm_vm_shm_ops;
 637                 vma->vm_private_data = (void *)map;
 638                 break;
 639         case _DRM_SCATTER_GATHER:
 640                 vma->vm_ops = &drm_vm_sg_ops;
 641                 vma->vm_private_data = (void *)map;
 642                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 643                 break;
 644         default:
 645                 return -EINVAL; /* This should never happen. */
 646         }
 647         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 648
 649         drm_vm_open_locked(dev, vma);
 650         return 0;
 651 }
 652
 653 int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
 654 {
 655         struct drm_file *priv = filp->private_data;
 656         struct drm_device *dev = priv->minor->dev;
 657         int ret;
 658
 659         if (drm_device_is_unplugged(dev))
 660                 return -ENODEV;
 661
 662         mutex_lock(&dev->struct_mutex);
 663         ret = drm_mmap_locked(filp, vma);
 664         mutex_unlock(&dev->struct_mutex);
 665
 666         return ret;
 667 }
 668 EXPORT_SYMBOL(drm_legacy_mmap);
 669
 670 void drm_legacy_vma_flush(struct drm_device *dev)
 671 {
 672         struct drm_vma_entry *vma, *vma_temp;
 673
 674         /* Clear vma list (only needed for legacy drivers) */
 675         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 676                 list_del(&vma->head);
 677                 kfree(vma);
 678         }
 679 }
 680
 681 int drm_vma_info(struct seq_file *m, void *data)
 682 {
 683         struct drm_info_node *node = (struct drm_info_node *) m->private;
 684         struct drm_device *dev = node->minor->dev;
 685         struct drm_vma_entry *pt;
 686         struct vm_area_struct *vma;
 687         unsigned long vma_count = 0;
 688 #if defined(__i386__)
 689         unsigned int pgprot;
 690 #endif
 691
 692         mutex_lock(&dev->struct_mutex);
 693         list_for_each_entry(pt, &dev->vmalist, head)
 694                 vma_count++;
 695
 696         seq_printf(m, "vma use count: %lu, high_memory = %pK, 0x%pK\n",
 697                    vma_count, high_memory,
 698                    (void *)(unsigned long)virt_to_phys(high_memory));
 699
 700         list_for_each_entry(pt, &dev->vmalist, head) {
 701                 vma = pt->vma;
 702                 if (!vma)
 703                         continue;
 704                 seq_printf(m,
 705                            "\n%5d 0x%pK-0x%pK %c%c%c%c%c%c 0x%08lx000",
 706                            pt->pid,
 707                            (void *)vma->vm_start, (void *)vma->vm_end,
 708                            vma->vm_flags & VM_READ ? 'r' : '-',
 709                            vma->vm_flags & VM_WRITE ? 'w' : '-',
 710                            vma->vm_flags & VM_EXEC ? 'x' : '-',
 711                            vma->vm_flags & VM_MAYSHARE ? 's' : 'p',
 712                            vma->vm_flags & VM_LOCKED ? 'l' : '-',
 713                            vma->vm_flags & VM_IO ? 'i' : '-',
 714                            vma->vm_pgoff);
 715
 716 #if defined(__i386__)
 717                 pgprot = pgprot_val(vma->vm_page_prot);
 718                 seq_printf(m, " %c%c%c%c%c%c%c%c%c",
 719                            pgprot & _PAGE_PRESENT ? 'p' : '-',
 720                            pgprot & _PAGE_RW ? 'w' : 'r',
 721                            pgprot & _PAGE_USER ? 'u' : 's',
 722                            pgprot & _PAGE_PWT ? 't' : 'b',
 723                            pgprot & _PAGE_PCD ? 'u' : 'c',
 724                            pgprot & _PAGE_ACCESSED ? 'a' : '-',
 725                            pgprot & _PAGE_DIRTY ? 'd' : '-',
 726                            pgprot & _PAGE_PSE ? 'm' : 'k',
 727                            pgprot & _PAGE_GLOBAL ? 'g' : 'l');
 728 #endif
 729                 seq_printf(m, "\n");
 730         }
 731         mutex_unlock(&dev->struct_mutex);
 732         return 0;
 733 }