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 <linux/export.h>
  37 #include <linux/pci.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/vmalloc.h>
  40 #include <linux/pgtable.h>
  41
  42 #if defined(__ia64__)
  43 #include <linux/efi.h>
  44 #include <linux/slab.h>
  45 #endif
  46 #include <linux/mem_encrypt.h>
  47
  48
  49 #include <drm/drm_agpsupport.h>
  50 #include <drm/drm_device.h>
  51 #include <drm/drm_drv.h>
  52 #include <drm/drm_file.h>
  53 #include <drm/drm_framebuffer.h>
  54 #include <drm/drm_print.h>
  55
  56 #include "drm_internal.h"
  57 #include "drm_legacy.h"
  58
  59 struct drm_vma_entry {
  60         struct list_head head;
  61         struct vm_area_struct *vma;
  62         pid_t pid;
  63 };
  64
  65 static void drm_vm_open(struct vm_area_struct *vma);
  66 static void drm_vm_close(struct vm_area_struct *vma);
  67
  68 static pgprot_t drm_io_prot(struct drm_local_map *map,
  69                             struct vm_area_struct *vma)
  70 {
  71         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  72
  73 #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || \
  74     defined(__mips__)
  75         if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
  76                 tmp = pgprot_noncached(tmp);
  77         else
  78                 tmp = pgprot_writecombine(tmp);
  79 #elif defined(__ia64__)
  80         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
  81                                     vma->vm_start))
  82                 tmp = pgprot_writecombine(tmp);
  83         else
  84                 tmp = pgprot_noncached(tmp);
  85 #elif defined(__sparc__) || defined(__arm__)
  86         tmp = pgprot_noncached(tmp);
  87 #endif
  88         return tmp;
  89 }
  90
  91 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  92 {
  93         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  94
  95 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
  96         tmp = pgprot_noncached_wc(tmp);
  97 #endif
  98         return tmp;
  99 }
 100
 101 /*
 102  * \c fault method for AGP virtual memory.
 103  *
 104  * \param vma virtual memory area.
 105  * \param address access address.
 106  * \return pointer to the page structure.
 107  *
 108  * Find the right map and if it's AGP memory find the real physical page to
 109  * map, get the page, increment the use count and return it.
 110  */
 111 #if IS_ENABLED(CONFIG_AGP)
 112 static vm_fault_t drm_vm_fault(struct vm_fault *vmf)
 113 {
 114         struct vm_area_struct *vma = vmf->vma;
 115         struct drm_file *priv = vma->vm_file->private_data;
 116         struct drm_device *dev = priv->minor->dev;
 117         struct drm_local_map *map = NULL;
 118         struct drm_map_list *r_list;
 119         struct drm_hash_item *hash;
 120
 121         /*
 122          * Find the right map
 123          */
 124         if (!dev->agp)
 125                 goto vm_fault_error;
 126
 127         if (!dev->agp || !dev->agp->cant_use_aperture)
 128                 goto vm_fault_error;
 129
 130         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
 131                 goto vm_fault_error;
 132
 133         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 134         map = r_list->map;
 135
 136         if (map && map->type == _DRM_AGP) {
 137                 /*
 138                  * Using vm_pgoff as a selector forces us to use this unusual
 139                  * addressing scheme.
 140                  */
 141                 resource_size_t offset = vmf->address - vma->vm_start;
 142                 resource_size_t baddr = map->offset + offset;
 143                 struct drm_agp_mem *agpmem;
 144                 struct page *page;
 145
 146 #ifdef __alpha__
 147                 /*
 148                  * Adjust to a bus-relative address
 149                  */
 150                 baddr -= dev->hose->mem_space->start;
 151 #endif
 152
 153                 /*
 154                  * It's AGP memory - find the real physical page to map
 155                  */
 156                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 157                         if (agpmem->bound <= baddr &&
 158                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 159                                 break;
 160                 }
 161
 162                 if (&agpmem->head == &dev->agp->memory)
 163                         goto vm_fault_error;
 164
 165                 /*
 166                  * Get the page, inc the use count, and return it
 167                  */
 168                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 169                 page = agpmem->memory->pages[offset];
 170                 get_page(page);
 171                 vmf->page = page;
 172
 173                 DRM_DEBUG
 174                     ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
 175                      (unsigned long long)baddr,
 176                      agpmem->memory->pages[offset],
 177                      (unsigned long long)offset,
 178                      page_count(page));
 179                 return 0;
 180         }
 181 vm_fault_error:
 182         return VM_FAULT_SIGBUS; /* Disallow mremap */
 183 }
 184 #else
 185 static vm_fault_t drm_vm_fault(struct vm_fault *vmf)
 186 {
 187         return VM_FAULT_SIGBUS;
 188 }
 189 #endif
 190
 191 /*
 192  * \c nopage method for shared virtual memory.
 193  *
 194  * \param vma virtual memory area.
 195  * \param address access address.
 196  * \return pointer to the page structure.
 197  *
 198  * Get the mapping, find the real physical page to map, get the page, and
 199  * return it.
 200  */
 201 static vm_fault_t drm_vm_shm_fault(struct vm_fault *vmf)
 202 {
 203         struct vm_area_struct *vma = vmf->vma;
 204         struct drm_local_map *map = vma->vm_private_data;
 205         unsigned long offset;
 206         unsigned long i;
 207         struct page *page;
 208
 209         if (!map)
 210                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 211
 212         offset = vmf->address - vma->vm_start;
 213         i = (unsigned long)map->handle + offset;
 214         page = vmalloc_to_page((void *)i);
 215         if (!page)
 216                 return VM_FAULT_SIGBUS;
 217         get_page(page);
 218         vmf->page = page;
 219
 220         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 221         return 0;
 222 }
 223
 224 /*
 225  * \c close method for shared virtual memory.
 226  *
 227  * \param vma virtual memory area.
 228  *
 229  * Deletes map information if we are the last
 230  * person to close a mapping and it's not in the global maplist.
 231  */
 232 static void drm_vm_shm_close(struct vm_area_struct *vma)
 233 {
 234         struct drm_file *priv = vma->vm_file->private_data;
 235         struct drm_device *dev = priv->minor->dev;
 236         struct drm_vma_entry *pt, *temp;
 237         struct drm_local_map *map;
 238         struct drm_map_list *r_list;
 239         int found_maps = 0;
 240
 241         DRM_DEBUG("0x%08lx,0x%08lx\n",
 242                   vma->vm_start, vma->vm_end - vma->vm_start);
 243
 244         map = vma->vm_private_data;
 245
 246         mutex_lock(&dev->struct_mutex);
 247         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 248                 if (pt->vma->vm_private_data == map)
 249                         found_maps++;
 250                 if (pt->vma == vma) {
 251                         list_del(&pt->head);
 252                         kfree(pt);
 253                 }
 254         }
 255
 256         /* We were the only map that was found */
 257         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 258                 /* Check to see if we are in the maplist, if we are not, then
 259                  * we delete this mappings information.
 260                  */
 261                 found_maps = 0;
 262                 list_for_each_entry(r_list, &dev->maplist, head) {
 263                         if (r_list->map == map)
 264                                 found_maps++;
 265                 }
 266
 267                 if (!found_maps) {
 268                         switch (map->type) {
 269                         case _DRM_REGISTERS:
 270                         case _DRM_FRAME_BUFFER:
 271                                 arch_phys_wc_del(map->mtrr);
 272                                 iounmap(map->handle);
 273                                 break;
 274                         case _DRM_SHM:
 275                                 vfree(map->handle);
 276                                 break;
 277                         case _DRM_AGP:
 278                         case _DRM_SCATTER_GATHER:
 279                                 break;
 280                         case _DRM_CONSISTENT:
 281                                 dma_free_coherent(&dev->pdev->dev,
 282                                                   map->size,
 283                                                   map->handle,
 284                                                   map->offset);
 285                                 break;
 286                         }
 287                         kfree(map);
 288                 }
 289         }
 290         mutex_unlock(&dev->struct_mutex);
 291 }
 292
 293 /*
 294  * \c fault method for DMA virtual memory.
 295  *
 296  * \param address access address.
 297  * \return pointer to the page structure.
 298  *
 299  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 300  */
 301 static vm_fault_t drm_vm_dma_fault(struct vm_fault *vmf)
 302 {
 303         struct vm_area_struct *vma = vmf->vma;
 304         struct drm_file *priv = vma->vm_file->private_data;
 305         struct drm_device *dev = priv->minor->dev;
 306         struct drm_device_dma *dma = dev->dma;
 307         unsigned long offset;
 308         unsigned long page_nr;
 309         struct page *page;
 310
 311         if (!dma)
 312                 return VM_FAULT_SIGBUS; /* Error */
 313         if (!dma->pagelist)
 314                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 315
 316         offset = vmf->address - vma->vm_start;
 317                                         /* vm_[pg]off[set] should be 0 */
 318         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 319         page = virt_to_page((void *)dma->pagelist[page_nr]);
 320
 321         get_page(page);
 322         vmf->page = page;
 323
 324         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 325         return 0;
 326 }
 327
 328 /*
 329  * \c fault method for scatter-gather virtual memory.
 330  *
 331  * \param address access address.
 332  * \return pointer to the page structure.
 333  *
 334  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 335  */
 336 static vm_fault_t drm_vm_sg_fault(struct vm_fault *vmf)
 337 {
 338         struct vm_area_struct *vma = vmf->vma;
 339         struct drm_local_map *map = vma->vm_private_data;
 340         struct drm_file *priv = vma->vm_file->private_data;
 341         struct drm_device *dev = priv->minor->dev;
 342         struct drm_sg_mem *entry = dev->sg;
 343         unsigned long offset;
 344         unsigned long map_offset;
 345         unsigned long page_offset;
 346         struct page *page;
 347
 348         if (!entry)
 349                 return VM_FAULT_SIGBUS; /* Error */
 350         if (!entry->pagelist)
 351                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 352
 353         offset = vmf->address - vma->vm_start;
 354         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 355         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 356         page = entry->pagelist[page_offset];
 357         get_page(page);
 358         vmf->page = page;
 359
 360         return 0;
 361 }
 362
 363 /** AGP virtual memory operations */
 364 static const struct vm_operations_struct drm_vm_ops = {
 365         .fault = drm_vm_fault,
 366         .open = drm_vm_open,
 367         .close = drm_vm_close,
 368 };
 369
 370 /** Shared virtual memory operations */
 371 static const struct vm_operations_struct drm_vm_shm_ops = {
 372         .fault = drm_vm_shm_fault,
 373         .open = drm_vm_open,
 374         .close = drm_vm_shm_close,
 375 };
 376
 377 /** DMA virtual memory operations */
 378 static const struct vm_operations_struct drm_vm_dma_ops = {
 379         .fault = drm_vm_dma_fault,
 380         .open = drm_vm_open,
 381         .close = drm_vm_close,
 382 };
 383
 384 /** Scatter-gather virtual memory operations */
 385 static const struct vm_operations_struct drm_vm_sg_ops = {
 386         .fault = drm_vm_sg_fault,
 387         .open = drm_vm_open,
 388         .close = drm_vm_close,
 389 };
 390
 391 static void drm_vm_open_locked(struct drm_device *dev,
 392                                struct vm_area_struct *vma)
 393 {
 394         struct drm_vma_entry *vma_entry;
 395
 396         DRM_DEBUG("0x%08lx,0x%08lx\n",
 397                   vma->vm_start, vma->vm_end - vma->vm_start);
 398
 399         vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 400         if (vma_entry) {
 401                 vma_entry->vma = vma;
 402                 vma_entry->pid = current->pid;
 403                 list_add(&vma_entry->head, &dev->vmalist);
 404         }
 405 }
 406
 407 static void drm_vm_open(struct vm_area_struct *vma)
 408 {
 409         struct drm_file *priv = vma->vm_file->private_data;
 410         struct drm_device *dev = priv->minor->dev;
 411
 412         mutex_lock(&dev->struct_mutex);
 413         drm_vm_open_locked(dev, vma);
 414         mutex_unlock(&dev->struct_mutex);
 415 }
 416
 417 static void drm_vm_close_locked(struct drm_device *dev,
 418                                 struct vm_area_struct *vma)
 419 {
 420         struct drm_vma_entry *pt, *temp;
 421
 422         DRM_DEBUG("0x%08lx,0x%08lx\n",
 423                   vma->vm_start, vma->vm_end - vma->vm_start);
 424
 425         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 426                 if (pt->vma == vma) {
 427                         list_del(&pt->head);
 428                         kfree(pt);
 429                         break;
 430                 }
 431         }
 432 }
 433
 434 /*
 435  * \c close method for all virtual memory types.
 436  *
 437  * \param vma virtual memory area.
 438  *
 439  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 440  * free it.
 441  */
 442 static void drm_vm_close(struct vm_area_struct *vma)
 443 {
 444         struct drm_file *priv = vma->vm_file->private_data;
 445         struct drm_device *dev = priv->minor->dev;
 446
 447         mutex_lock(&dev->struct_mutex);
 448         drm_vm_close_locked(dev, vma);
 449         mutex_unlock(&dev->struct_mutex);
 450 }
 451
 452 /*
 453  * mmap DMA memory.
 454  *
 455  * \param file_priv DRM file private.
 456  * \param vma virtual memory area.
 457  * \return zero on success or a negative number on failure.
 458  *
 459  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 460  * pointer, and calls vm_open().
 461  */
 462 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 463 {
 464         struct drm_file *priv = filp->private_data;
 465         struct drm_device *dev;
 466         struct drm_device_dma *dma;
 467         unsigned long length = vma->vm_end - vma->vm_start;
 468
 469         dev = priv->minor->dev;
 470         dma = dev->dma;
 471         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 472                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 473
 474         /* Length must match exact page count */
 475         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 476                 return -EINVAL;
 477         }
 478
 479         if (!capable(CAP_SYS_ADMIN) &&
 480             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 481                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 482 #if defined(__i386__) || defined(__x86_64__)
 483                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 484 #else
 485                 /* Ye gads this is ugly.  With more thought
 486                    we could move this up higher and use
 487                    `protection_map' instead.  */
 488                 vma->vm_page_prot =
 489                     __pgprot(pte_val
 490                              (pte_wrprotect
 491                               (__pte(pgprot_val(vma->vm_page_prot)))));
 492 #endif
 493         }
 494
 495         vma->vm_ops = &drm_vm_dma_ops;
 496
 497         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 498
 499         drm_vm_open_locked(dev, vma);
 500         return 0;
 501 }
 502
 503 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 504 {
 505 #ifdef __alpha__
 506         return dev->hose->dense_mem_base;
 507 #else
 508         return 0;
 509 #endif
 510 }
 511
 512 /*
 513  * mmap DMA memory.
 514  *
 515  * \param file_priv DRM file private.
 516  * \param vma virtual memory area.
 517  * \return zero on success or a negative number on failure.
 518  *
 519  * If the virtual memory area has no offset associated with it then it's a DMA
 520  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 521  * checks that the restricted flag is not set, sets the virtual memory operations
 522  * according to the mapping type and remaps the pages. Finally sets the file
 523  * pointer and calls vm_open().
 524  */
 525 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 526 {
 527         struct drm_file *priv = filp->private_data;
 528         struct drm_device *dev = priv->minor->dev;
 529         struct drm_local_map *map = NULL;
 530         resource_size_t offset = 0;
 531         struct drm_hash_item *hash;
 532
 533         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 534                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 535
 536         if (!priv->authenticated)
 537                 return -EACCES;
 538
 539         /* We check for "dma". On Apple's UniNorth, it's valid to have
 540          * the AGP mapped at physical address 0
 541          * --BenH.
 542          */
 543         if (!vma->vm_pgoff
 544 #if IS_ENABLED(CONFIG_AGP)
 545             && (!dev->agp
 546                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 547 #endif
 548             )
 549                 return drm_mmap_dma(filp, vma);
 550
 551         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 552                 DRM_ERROR("Could not find map\n");
 553                 return -EINVAL;
 554         }
 555
 556         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 557         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 558                 return -EPERM;
 559
 560         /* Check for valid size. */
 561         if (map->size < vma->vm_end - vma->vm_start)
 562                 return -EINVAL;
 563
 564         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 565                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 566 #if defined(__i386__) || defined(__x86_64__)
 567                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 568 #else
 569                 /* Ye gads this is ugly.  With more thought
 570                    we could move this up higher and use
 571                    `protection_map' instead.  */
 572                 vma->vm_page_prot =
 573                     __pgprot(pte_val
 574                              (pte_wrprotect
 575                               (__pte(pgprot_val(vma->vm_page_prot)))));
 576 #endif
 577         }
 578
 579         switch (map->type) {
 580 #if !defined(__arm__)
 581         case _DRM_AGP:
 582                 if (dev->agp && dev->agp->cant_use_aperture) {
 583                         /*
 584                          * On some platforms we can't talk to bus dma address from the CPU, so for
 585                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 586                          * pages and mappings in fault()
 587                          */
 588 #if defined(__powerpc__)
 589                         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 590 #endif
 591                         vma->vm_ops = &drm_vm_ops;
 592                         break;
 593                 }
 594                 fallthrough;    /* to _DRM_FRAME_BUFFER... */
 595 #endif
 596         case _DRM_FRAME_BUFFER:
 597         case _DRM_REGISTERS:
 598                 offset = drm_core_get_reg_ofs(dev);
 599                 vma->vm_page_prot = drm_io_prot(map, vma);
 600                 if (io_remap_pfn_range(vma, vma->vm_start,
 601                                        (map->offset + offset) >> PAGE_SHIFT,
 602                                        vma->vm_end - vma->vm_start,
 603                                        vma->vm_page_prot))
 604                         return -EAGAIN;
 605                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 606                           " offset = 0x%llx\n",
 607                           map->type,
 608                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
 609
 610                 vma->vm_ops = &drm_vm_ops;
 611                 break;
 612         case _DRM_CONSISTENT:
 613                 /* Consistent memory is really like shared memory. But
 614                  * it's allocated in a different way, so avoid fault */
 615                 if (remap_pfn_range(vma, vma->vm_start,
 616                     page_to_pfn(virt_to_page(map->handle)),
 617                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 618                         return -EAGAIN;
 619                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 620                 fallthrough;    /* to _DRM_SHM */
 621         case _DRM_SHM:
 622                 vma->vm_ops = &drm_vm_shm_ops;
 623                 vma->vm_private_data = (void *)map;
 624                 break;
 625         case _DRM_SCATTER_GATHER:
 626                 vma->vm_ops = &drm_vm_sg_ops;
 627                 vma->vm_private_data = (void *)map;
 628                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 629                 break;
 630         default:
 631                 return -EINVAL; /* This should never happen. */
 632         }
 633         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 634
 635         drm_vm_open_locked(dev, vma);
 636         return 0;
 637 }
 638
 639 int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
 640 {
 641         struct drm_file *priv = filp->private_data;
 642         struct drm_device *dev = priv->minor->dev;
 643         int ret;
 644
 645         if (drm_dev_is_unplugged(dev))
 646                 return -ENODEV;
 647
 648         mutex_lock(&dev->struct_mutex);
 649         ret = drm_mmap_locked(filp, vma);
 650         mutex_unlock(&dev->struct_mutex);
 651
 652         return ret;
 653 }
 654 EXPORT_SYMBOL(drm_legacy_mmap);
 655
 656 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 657 void drm_legacy_vma_flush(struct drm_device *dev)
 658 {
 659         struct drm_vma_entry *vma, *vma_temp;
 660
 661         /* Clear vma list (only needed for legacy drivers) */
 662         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 663                 list_del(&vma->head);
 664                 kfree(vma);
 665         }
 666 }
 667 #endif