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_internal.h"
  45 #include "drm_legacy.h"
  46
  47 struct drm_vma_entry {
  48         struct list_head head;
  49         struct vm_area_struct *vma;
  50         pid_t pid;
  51 };
  52
  53 static void drm_vm_open(struct vm_area_struct *vma);
  54 static void drm_vm_close(struct vm_area_struct *vma);
  55
  56 static pgprot_t drm_io_prot(struct drm_local_map *map,
  57                             struct vm_area_struct *vma)
  58 {
  59         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  60
  61 #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__)
  62         if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
  63                 tmp = pgprot_noncached(tmp);
  64         else
  65                 tmp = pgprot_writecombine(tmp);
  66 #elif defined(__ia64__)
  67         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
  68                                     vma->vm_start))
  69                 tmp = pgprot_writecombine(tmp);
  70         else
  71                 tmp = pgprot_noncached(tmp);
  72 #elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
  73         tmp = pgprot_noncached(tmp);
  74 #endif
  75         return tmp;
  76 }
  77
  78 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  79 {
  80         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  81
  82 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
  83         tmp = pgprot_noncached_wc(tmp);
  84 #endif
  85         return tmp;
  86 }
  87
  88 /**
  89  * \c fault method for AGP virtual memory.
  90  *
  91  * \param vma virtual memory area.
  92  * \param address access address.
  93  * \return pointer to the page structure.
  94  *
  95  * Find the right map and if it's AGP memory find the real physical page to
  96  * map, get the page, increment the use count and return it.
  97  */
  98 #if IS_ENABLED(CONFIG_AGP)
  99 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 100 {
 101         struct drm_file *priv = vma->vm_file->private_data;
 102         struct drm_device *dev = priv->minor->dev;
 103         struct drm_local_map *map = NULL;
 104         struct drm_map_list *r_list;
 105         struct drm_hash_item *hash;
 106
 107         /*
 108          * Find the right map
 109          */
 110         if (!dev->agp)
 111                 goto vm_fault_error;
 112
 113         if (!dev->agp || !dev->agp->cant_use_aperture)
 114                 goto vm_fault_error;
 115
 116         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
 117                 goto vm_fault_error;
 118
 119         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 120         map = r_list->map;
 121
 122         if (map && map->type == _DRM_AGP) {
 123                 /*
 124                  * Using vm_pgoff as a selector forces us to use this unusual
 125                  * addressing scheme.
 126                  */
 127                 resource_size_t offset = (unsigned long)vmf->virtual_address -
 128                         vma->vm_start;
 129                 resource_size_t baddr = map->offset + offset;
 130                 struct drm_agp_mem *agpmem;
 131                 struct page *page;
 132
 133 #ifdef __alpha__
 134                 /*
 135                  * Adjust to a bus-relative address
 136                  */
 137                 baddr -= dev->hose->mem_space->start;
 138 #endif
 139
 140                 /*
 141                  * It's AGP memory - find the real physical page to map
 142                  */
 143                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 144                         if (agpmem->bound <= baddr &&
 145                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 146                                 break;
 147                 }
 148
 149                 if (&agpmem->head == &dev->agp->memory)
 150                         goto vm_fault_error;
 151
 152                 /*
 153                  * Get the page, inc the use count, and return it
 154                  */
 155                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 156                 page = agpmem->memory->pages[offset];
 157                 get_page(page);
 158                 vmf->page = page;
 159
 160                 DRM_DEBUG
 161                     ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
 162                      (unsigned long long)baddr,
 163                      agpmem->memory->pages[offset],
 164                      (unsigned long long)offset,
 165                      page_count(page));
 166                 return 0;
 167         }
 168 vm_fault_error:
 169         return VM_FAULT_SIGBUS; /* Disallow mremap */
 170 }
 171 #else
 172 static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 173 {
 174         return VM_FAULT_SIGBUS;
 175 }
 176 #endif
 177
 178 /**
 179  * \c nopage method for shared virtual memory.
 180  *
 181  * \param vma virtual memory area.
 182  * \param address access address.
 183  * \return pointer to the page structure.
 184  *
 185  * Get the mapping, find the real physical page to map, get the page, and
 186  * return it.
 187  */
 188 static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 189 {
 190         struct drm_local_map *map = vma->vm_private_data;
 191         unsigned long offset;
 192         unsigned long i;
 193         struct page *page;
 194
 195         if (!map)
 196                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 197
 198         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 199         i = (unsigned long)map->handle + offset;
 200         page = vmalloc_to_page((void *)i);
 201         if (!page)
 202                 return VM_FAULT_SIGBUS;
 203         get_page(page);
 204         vmf->page = page;
 205
 206         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 207         return 0;
 208 }
 209
 210 /**
 211  * \c close method for shared virtual memory.
 212  *
 213  * \param vma virtual memory area.
 214  *
 215  * Deletes map information if we are the last
 216  * person to close a mapping and it's not in the global maplist.
 217  */
 218 static void drm_vm_shm_close(struct vm_area_struct *vma)
 219 {
 220         struct drm_file *priv = vma->vm_file->private_data;
 221         struct drm_device *dev = priv->minor->dev;
 222         struct drm_vma_entry *pt, *temp;
 223         struct drm_local_map *map;
 224         struct drm_map_list *r_list;
 225         int found_maps = 0;
 226
 227         DRM_DEBUG("0x%08lx,0x%08lx\n",
 228                   vma->vm_start, vma->vm_end - vma->vm_start);
 229
 230         map = vma->vm_private_data;
 231
 232         mutex_lock(&dev->struct_mutex);
 233         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 234                 if (pt->vma->vm_private_data == map)
 235                         found_maps++;
 236                 if (pt->vma == vma) {
 237                         list_del(&pt->head);
 238                         kfree(pt);
 239                 }
 240         }
 241
 242         /* We were the only map that was found */
 243         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 244                 /* Check to see if we are in the maplist, if we are not, then
 245                  * we delete this mappings information.
 246                  */
 247                 found_maps = 0;
 248                 list_for_each_entry(r_list, &dev->maplist, head) {
 249                         if (r_list->map == map)
 250                                 found_maps++;
 251                 }
 252
 253                 if (!found_maps) {
 254                         drm_dma_handle_t dmah;
 255
 256                         switch (map->type) {
 257                         case _DRM_REGISTERS:
 258                         case _DRM_FRAME_BUFFER:
 259                                 arch_phys_wc_del(map->mtrr);
 260                                 iounmap(map->handle);
 261                                 break;
 262                         case _DRM_SHM:
 263                                 vfree(map->handle);
 264                                 break;
 265                         case _DRM_AGP:
 266                         case _DRM_SCATTER_GATHER:
 267                                 break;
 268                         case _DRM_CONSISTENT:
 269                                 dmah.vaddr = map->handle;
 270                                 dmah.busaddr = map->offset;
 271                                 dmah.size = map->size;
 272                                 __drm_legacy_pci_free(dev, &dmah);
 273                                 break;
 274                         }
 275                         kfree(map);
 276                 }
 277         }
 278         mutex_unlock(&dev->struct_mutex);
 279 }
 280
 281 /**
 282  * \c fault method for DMA virtual memory.
 283  *
 284  * \param vma virtual memory area.
 285  * \param address access address.
 286  * \return pointer to the page structure.
 287  *
 288  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 289  */
 290 static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 291 {
 292         struct drm_file *priv = vma->vm_file->private_data;
 293         struct drm_device *dev = priv->minor->dev;
 294         struct drm_device_dma *dma = dev->dma;
 295         unsigned long offset;
 296         unsigned long page_nr;
 297         struct page *page;
 298
 299         if (!dma)
 300                 return VM_FAULT_SIGBUS; /* Error */
 301         if (!dma->pagelist)
 302                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 303
 304         offset = (unsigned long)vmf->virtual_address - vma->vm_start;   /* vm_[pg]off[set] should be 0 */
 305         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 306         page = virt_to_page((void *)dma->pagelist[page_nr]);
 307
 308         get_page(page);
 309         vmf->page = page;
 310
 311         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 312         return 0;
 313 }
 314
 315 /**
 316  * \c fault method for scatter-gather virtual memory.
 317  *
 318  * \param vma virtual memory area.
 319  * \param address access address.
 320  * \return pointer to the page structure.
 321  *
 322  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 323  */
 324 static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 325 {
 326         struct drm_local_map *map = vma->vm_private_data;
 327         struct drm_file *priv = vma->vm_file->private_data;
 328         struct drm_device *dev = priv->minor->dev;
 329         struct drm_sg_mem *entry = dev->sg;
 330         unsigned long offset;
 331         unsigned long map_offset;
 332         unsigned long page_offset;
 333         struct page *page;
 334
 335         if (!entry)
 336                 return VM_FAULT_SIGBUS; /* Error */
 337         if (!entry->pagelist)
 338                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 339
 340         offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 341         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 342         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 343         page = entry->pagelist[page_offset];
 344         get_page(page);
 345         vmf->page = page;
 346
 347         return 0;
 348 }
 349
 350 static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 351 {
 352         return drm_do_vm_fault(vma, vmf);
 353 }
 354
 355 static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 356 {
 357         return drm_do_vm_shm_fault(vma, vmf);
 358 }
 359
 360 static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 361 {
 362         return drm_do_vm_dma_fault(vma, vmf);
 363 }
 364
 365 static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 366 {
 367         return drm_do_vm_sg_fault(vma, vmf);
 368 }
 369
 370 /** AGP virtual memory operations */
 371 static const struct vm_operations_struct drm_vm_ops = {
 372         .fault = drm_vm_fault,
 373         .open = drm_vm_open,
 374         .close = drm_vm_close,
 375 };
 376
 377 /** Shared virtual memory operations */
 378 static const struct vm_operations_struct drm_vm_shm_ops = {
 379         .fault = drm_vm_shm_fault,
 380         .open = drm_vm_open,
 381         .close = drm_vm_shm_close,
 382 };
 383
 384 /** DMA virtual memory operations */
 385 static const struct vm_operations_struct drm_vm_dma_ops = {
 386         .fault = drm_vm_dma_fault,
 387         .open = drm_vm_open,
 388         .close = drm_vm_close,
 389 };
 390
 391 /** Scatter-gather virtual memory operations */
 392 static const struct vm_operations_struct drm_vm_sg_ops = {
 393         .fault = drm_vm_sg_fault,
 394         .open = drm_vm_open,
 395         .close = drm_vm_close,
 396 };
 397
 398 static void drm_vm_open_locked(struct drm_device *dev,
 399                                struct vm_area_struct *vma)
 400 {
 401         struct drm_vma_entry *vma_entry;
 402
 403         DRM_DEBUG("0x%08lx,0x%08lx\n",
 404                   vma->vm_start, vma->vm_end - vma->vm_start);
 405
 406         vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 407         if (vma_entry) {
 408                 vma_entry->vma = vma;
 409                 vma_entry->pid = current->pid;
 410                 list_add(&vma_entry->head, &dev->vmalist);
 411         }
 412 }
 413
 414 static void drm_vm_open(struct vm_area_struct *vma)
 415 {
 416         struct drm_file *priv = vma->vm_file->private_data;
 417         struct drm_device *dev = priv->minor->dev;
 418
 419         mutex_lock(&dev->struct_mutex);
 420         drm_vm_open_locked(dev, vma);
 421         mutex_unlock(&dev->struct_mutex);
 422 }
 423
 424 static void drm_vm_close_locked(struct drm_device *dev,
 425                                 struct vm_area_struct *vma)
 426 {
 427         struct drm_vma_entry *pt, *temp;
 428
 429         DRM_DEBUG("0x%08lx,0x%08lx\n",
 430                   vma->vm_start, vma->vm_end - vma->vm_start);
 431
 432         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 433                 if (pt->vma == vma) {
 434                         list_del(&pt->head);
 435                         kfree(pt);
 436                         break;
 437                 }
 438         }
 439 }
 440
 441 /**
 442  * \c close method for all virtual memory types.
 443  *
 444  * \param vma virtual memory area.
 445  *
 446  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 447  * free it.
 448  */
 449 static void drm_vm_close(struct vm_area_struct *vma)
 450 {
 451         struct drm_file *priv = vma->vm_file->private_data;
 452         struct drm_device *dev = priv->minor->dev;
 453
 454         mutex_lock(&dev->struct_mutex);
 455         drm_vm_close_locked(dev, vma);
 456         mutex_unlock(&dev->struct_mutex);
 457 }
 458
 459 /**
 460  * mmap DMA memory.
 461  *
 462  * \param file_priv DRM file private.
 463  * \param vma virtual memory area.
 464  * \return zero on success or a negative number on failure.
 465  *
 466  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 467  * pointer, and calls vm_open().
 468  */
 469 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 470 {
 471         struct drm_file *priv = filp->private_data;
 472         struct drm_device *dev;
 473         struct drm_device_dma *dma;
 474         unsigned long length = vma->vm_end - vma->vm_start;
 475
 476         dev = priv->minor->dev;
 477         dma = dev->dma;
 478         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 479                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 480
 481         /* Length must match exact page count */
 482         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 483                 return -EINVAL;
 484         }
 485
 486         if (!capable(CAP_SYS_ADMIN) &&
 487             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 488                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 489 #if defined(__i386__) || defined(__x86_64__)
 490                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 491 #else
 492                 /* Ye gads this is ugly.  With more thought
 493                    we could move this up higher and use
 494                    `protection_map' instead.  */
 495                 vma->vm_page_prot =
 496                     __pgprot(pte_val
 497                              (pte_wrprotect
 498                               (__pte(pgprot_val(vma->vm_page_prot)))));
 499 #endif
 500         }
 501
 502         vma->vm_ops = &drm_vm_dma_ops;
 503
 504         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 505
 506         drm_vm_open_locked(dev, vma);
 507         return 0;
 508 }
 509
 510 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 511 {
 512 #ifdef __alpha__
 513         return dev->hose->dense_mem_base;
 514 #else
 515         return 0;
 516 #endif
 517 }
 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->minor->dev;
 536         struct drm_local_map *map = NULL;
 537         resource_size_t 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 IS_ENABLED(CONFIG_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 #if !defined(__arm__)
 588         case _DRM_AGP:
 589                 if (dev->agp && dev->agp->cant_use_aperture) {
 590                         /*
 591                          * On some platforms we can't talk to bus dma address from the CPU, so for
 592                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 593                          * pages and mappings in fault()
 594                          */
 595 #if defined(__powerpc__)
 596                         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 597 #endif
 598                         vma->vm_ops = &drm_vm_ops;
 599                         break;
 600                 }
 601                 /* fall through to _DRM_FRAME_BUFFER... */
 602 #endif
 603         case _DRM_FRAME_BUFFER:
 604         case _DRM_REGISTERS:
 605                 offset = drm_core_get_reg_ofs(dev);
 606                 vma->vm_page_prot = drm_io_prot(map, vma);
 607                 if (io_remap_pfn_range(vma, vma->vm_start,
 608                                        (map->offset + offset) >> PAGE_SHIFT,
 609                                        vma->vm_end - vma->vm_start,
 610                                        vma->vm_page_prot))
 611                         return -EAGAIN;
 612                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 613                           " offset = 0x%llx\n",
 614                           map->type,
 615                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
 616
 617                 vma->vm_ops = &drm_vm_ops;
 618                 break;
 619         case _DRM_CONSISTENT:
 620                 /* Consistent memory is really like shared memory. But
 621                  * it's allocated in a different way, so avoid fault */
 622                 if (remap_pfn_range(vma, vma->vm_start,
 623                     page_to_pfn(virt_to_page(map->handle)),
 624                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 625                         return -EAGAIN;
 626                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 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                 break;
 632         case _DRM_SCATTER_GATHER:
 633                 vma->vm_ops = &drm_vm_sg_ops;
 634                 vma->vm_private_data = (void *)map;
 635                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 636                 break;
 637         default:
 638                 return -EINVAL; /* This should never happen. */
 639         }
 640         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 641
 642         drm_vm_open_locked(dev, vma);
 643         return 0;
 644 }
 645
 646 int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
 647 {
 648         struct drm_file *priv = filp->private_data;
 649         struct drm_device *dev = priv->minor->dev;
 650         int ret;
 651
 652         if (drm_device_is_unplugged(dev))
 653                 return -ENODEV;
 654
 655         mutex_lock(&dev->struct_mutex);
 656         ret = drm_mmap_locked(filp, vma);
 657         mutex_unlock(&dev->struct_mutex);
 658
 659         return ret;
 660 }
 661 EXPORT_SYMBOL(drm_legacy_mmap);
 662
 663 void drm_legacy_vma_flush(struct drm_device *dev)
 664 {
 665         struct drm_vma_entry *vma, *vma_temp;
 666
 667         /* Clear vma list (only needed for legacy drivers) */
 668         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 669                 list_del(&vma->head);
 670                 kfree(vma);
 671         }
 672 }