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         /* We don't want graphics memory to be mapped encrypted */
  74         tmp = pgprot_decrypted(tmp);
  75
  76 #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || \
  77     defined(__mips__)
  78         if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
  79                 tmp = pgprot_noncached(tmp);
  80         else
  81                 tmp = pgprot_writecombine(tmp);
  82 #elif defined(__ia64__)
  83         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
  84                                     vma->vm_start))
  85                 tmp = pgprot_writecombine(tmp);
  86         else
  87                 tmp = pgprot_noncached(tmp);
  88 #elif defined(__sparc__) || defined(__arm__)
  89         tmp = pgprot_noncached(tmp);
  90 #endif
  91         return tmp;
  92 }
  93
  94 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  95 {
  96         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  97
  98 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
  99         tmp = pgprot_noncached_wc(tmp);
 100 #endif
 101         return tmp;
 102 }
 103
 104 /*
 105  * \c fault method for AGP virtual memory.
 106  *
 107  * \param vma virtual memory area.
 108  * \param address access address.
 109  * \return pointer to the page structure.
 110  *
 111  * Find the right map and if it's AGP memory find the real physical page to
 112  * map, get the page, increment the use count and return it.
 113  */
 114 #if IS_ENABLED(CONFIG_AGP)
 115 static vm_fault_t drm_vm_fault(struct vm_fault *vmf)
 116 {
 117         struct vm_area_struct *vma = vmf->vma;
 118         struct drm_file *priv = vma->vm_file->private_data;
 119         struct drm_device *dev = priv->minor->dev;
 120         struct drm_local_map *map = NULL;
 121         struct drm_map_list *r_list;
 122         struct drm_hash_item *hash;
 123
 124         /*
 125          * Find the right map
 126          */
 127         if (!dev->agp)
 128                 goto vm_fault_error;
 129
 130         if (!dev->agp || !dev->agp->cant_use_aperture)
 131                 goto vm_fault_error;
 132
 133         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
 134                 goto vm_fault_error;
 135
 136         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 137         map = r_list->map;
 138
 139         if (map && map->type == _DRM_AGP) {
 140                 /*
 141                  * Using vm_pgoff as a selector forces us to use this unusual
 142                  * addressing scheme.
 143                  */
 144                 resource_size_t offset = vmf->address - vma->vm_start;
 145                 resource_size_t baddr = map->offset + offset;
 146                 struct drm_agp_mem *agpmem;
 147                 struct page *page;
 148
 149 #ifdef __alpha__
 150                 /*
 151                  * Adjust to a bus-relative address
 152                  */
 153                 baddr -= dev->hose->mem_space->start;
 154 #endif
 155
 156                 /*
 157                  * It's AGP memory - find the real physical page to map
 158                  */
 159                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 160                         if (agpmem->bound <= baddr &&
 161                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 162                                 break;
 163                 }
 164
 165                 if (&agpmem->head == &dev->agp->memory)
 166                         goto vm_fault_error;
 167
 168                 /*
 169                  * Get the page, inc the use count, and return it
 170                  */
 171                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 172                 page = agpmem->memory->pages[offset];
 173                 get_page(page);
 174                 vmf->page = page;
 175
 176                 DRM_DEBUG
 177                     ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
 178                      (unsigned long long)baddr,
 179                      agpmem->memory->pages[offset],
 180                      (unsigned long long)offset,
 181                      page_count(page));
 182                 return 0;
 183         }
 184 vm_fault_error:
 185         return VM_FAULT_SIGBUS; /* Disallow mremap */
 186 }
 187 #else
 188 static vm_fault_t drm_vm_fault(struct vm_fault *vmf)
 189 {
 190         return VM_FAULT_SIGBUS;
 191 }
 192 #endif
 193
 194 /*
 195  * \c nopage method for shared virtual memory.
 196  *
 197  * \param vma virtual memory area.
 198  * \param address access address.
 199  * \return pointer to the page structure.
 200  *
 201  * Get the mapping, find the real physical page to map, get the page, and
 202  * return it.
 203  */
 204 static vm_fault_t drm_vm_shm_fault(struct vm_fault *vmf)
 205 {
 206         struct vm_area_struct *vma = vmf->vma;
 207         struct drm_local_map *map = vma->vm_private_data;
 208         unsigned long offset;
 209         unsigned long i;
 210         struct page *page;
 211
 212         if (!map)
 213                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 214
 215         offset = vmf->address - vma->vm_start;
 216         i = (unsigned long)map->handle + offset;
 217         page = vmalloc_to_page((void *)i);
 218         if (!page)
 219                 return VM_FAULT_SIGBUS;
 220         get_page(page);
 221         vmf->page = page;
 222
 223         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 224         return 0;
 225 }
 226
 227 /*
 228  * \c close method for shared virtual memory.
 229  *
 230  * \param vma virtual memory area.
 231  *
 232  * Deletes map information if we are the last
 233  * person to close a mapping and it's not in the global maplist.
 234  */
 235 static void drm_vm_shm_close(struct vm_area_struct *vma)
 236 {
 237         struct drm_file *priv = vma->vm_file->private_data;
 238         struct drm_device *dev = priv->minor->dev;
 239         struct drm_vma_entry *pt, *temp;
 240         struct drm_local_map *map;
 241         struct drm_map_list *r_list;
 242         int found_maps = 0;
 243
 244         DRM_DEBUG("0x%08lx,0x%08lx\n",
 245                   vma->vm_start, vma->vm_end - vma->vm_start);
 246
 247         map = vma->vm_private_data;
 248
 249         mutex_lock(&dev->struct_mutex);
 250         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 251                 if (pt->vma->vm_private_data == map)
 252                         found_maps++;
 253                 if (pt->vma == vma) {
 254                         list_del(&pt->head);
 255                         kfree(pt);
 256                 }
 257         }
 258
 259         /* We were the only map that was found */
 260         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 261                 /* Check to see if we are in the maplist, if we are not, then
 262                  * we delete this mappings information.
 263                  */
 264                 found_maps = 0;
 265                 list_for_each_entry(r_list, &dev->maplist, head) {
 266                         if (r_list->map == map)
 267                                 found_maps++;
 268                 }
 269
 270                 if (!found_maps) {
 271                         switch (map->type) {
 272                         case _DRM_REGISTERS:
 273                         case _DRM_FRAME_BUFFER:
 274                                 arch_phys_wc_del(map->mtrr);
 275                                 iounmap(map->handle);
 276                                 break;
 277                         case _DRM_SHM:
 278                                 vfree(map->handle);
 279                                 break;
 280                         case _DRM_AGP:
 281                         case _DRM_SCATTER_GATHER:
 282                                 break;
 283                         case _DRM_CONSISTENT:
 284                                 dma_free_coherent(&dev->pdev->dev,
 285                                                   map->size,
 286                                                   map->handle,
 287                                                   map->offset);
 288                                 break;
 289                         }
 290                         kfree(map);
 291                 }
 292         }
 293         mutex_unlock(&dev->struct_mutex);
 294 }
 295
 296 /*
 297  * \c fault method for DMA virtual memory.
 298  *
 299  * \param address access address.
 300  * \return pointer to the page structure.
 301  *
 302  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 303  */
 304 static vm_fault_t drm_vm_dma_fault(struct vm_fault *vmf)
 305 {
 306         struct vm_area_struct *vma = vmf->vma;
 307         struct drm_file *priv = vma->vm_file->private_data;
 308         struct drm_device *dev = priv->minor->dev;
 309         struct drm_device_dma *dma = dev->dma;
 310         unsigned long offset;
 311         unsigned long page_nr;
 312         struct page *page;
 313
 314         if (!dma)
 315                 return VM_FAULT_SIGBUS; /* Error */
 316         if (!dma->pagelist)
 317                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 318
 319         offset = vmf->address - vma->vm_start;
 320                                         /* vm_[pg]off[set] should be 0 */
 321         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 322         page = virt_to_page((void *)dma->pagelist[page_nr]);
 323
 324         get_page(page);
 325         vmf->page = page;
 326
 327         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 328         return 0;
 329 }
 330
 331 /*
 332  * \c fault method for scatter-gather virtual memory.
 333  *
 334  * \param address access address.
 335  * \return pointer to the page structure.
 336  *
 337  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 338  */
 339 static vm_fault_t drm_vm_sg_fault(struct vm_fault *vmf)
 340 {
 341         struct vm_area_struct *vma = vmf->vma;
 342         struct drm_local_map *map = vma->vm_private_data;
 343         struct drm_file *priv = vma->vm_file->private_data;
 344         struct drm_device *dev = priv->minor->dev;
 345         struct drm_sg_mem *entry = dev->sg;
 346         unsigned long offset;
 347         unsigned long map_offset;
 348         unsigned long page_offset;
 349         struct page *page;
 350
 351         if (!entry)
 352                 return VM_FAULT_SIGBUS; /* Error */
 353         if (!entry->pagelist)
 354                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 355
 356         offset = vmf->address - vma->vm_start;
 357         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 358         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 359         page = entry->pagelist[page_offset];
 360         get_page(page);
 361         vmf->page = page;
 362
 363         return 0;
 364 }
 365
 366 /** AGP virtual memory operations */
 367 static const struct vm_operations_struct drm_vm_ops = {
 368         .fault = drm_vm_fault,
 369         .open = drm_vm_open,
 370         .close = drm_vm_close,
 371 };
 372
 373 /** Shared virtual memory operations */
 374 static const struct vm_operations_struct drm_vm_shm_ops = {
 375         .fault = drm_vm_shm_fault,
 376         .open = drm_vm_open,
 377         .close = drm_vm_shm_close,
 378 };
 379
 380 /** DMA virtual memory operations */
 381 static const struct vm_operations_struct drm_vm_dma_ops = {
 382         .fault = drm_vm_dma_fault,
 383         .open = drm_vm_open,
 384         .close = drm_vm_close,
 385 };
 386
 387 /** Scatter-gather virtual memory operations */
 388 static const struct vm_operations_struct drm_vm_sg_ops = {
 389         .fault = drm_vm_sg_fault,
 390         .open = drm_vm_open,
 391         .close = drm_vm_close,
 392 };
 393
 394 static void drm_vm_open_locked(struct drm_device *dev,
 395                                struct vm_area_struct *vma)
 396 {
 397         struct drm_vma_entry *vma_entry;
 398
 399         DRM_DEBUG("0x%08lx,0x%08lx\n",
 400                   vma->vm_start, vma->vm_end - vma->vm_start);
 401
 402         vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 403         if (vma_entry) {
 404                 vma_entry->vma = vma;
 405                 vma_entry->pid = current->pid;
 406                 list_add(&vma_entry->head, &dev->vmalist);
 407         }
 408 }
 409
 410 static void drm_vm_open(struct vm_area_struct *vma)
 411 {
 412         struct drm_file *priv = vma->vm_file->private_data;
 413         struct drm_device *dev = priv->minor->dev;
 414
 415         mutex_lock(&dev->struct_mutex);
 416         drm_vm_open_locked(dev, vma);
 417         mutex_unlock(&dev->struct_mutex);
 418 }
 419
 420 static void drm_vm_close_locked(struct drm_device *dev,
 421                                 struct vm_area_struct *vma)
 422 {
 423         struct drm_vma_entry *pt, *temp;
 424
 425         DRM_DEBUG("0x%08lx,0x%08lx\n",
 426                   vma->vm_start, vma->vm_end - vma->vm_start);
 427
 428         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 429                 if (pt->vma == vma) {
 430                         list_del(&pt->head);
 431                         kfree(pt);
 432                         break;
 433                 }
 434         }
 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
 450         mutex_lock(&dev->struct_mutex);
 451         drm_vm_close_locked(dev, vma);
 452         mutex_unlock(&dev->struct_mutex);
 453 }
 454
 455 /*
 456  * mmap DMA memory.
 457  *
 458  * \param file_priv DRM file private.
 459  * \param vma virtual memory area.
 460  * \return zero on success or a negative number on failure.
 461  *
 462  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 463  * pointer, and calls vm_open().
 464  */
 465 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 466 {
 467         struct drm_file *priv = filp->private_data;
 468         struct drm_device *dev;
 469         struct drm_device_dma *dma;
 470         unsigned long length = vma->vm_end - vma->vm_start;
 471
 472         dev = priv->minor->dev;
 473         dma = dev->dma;
 474         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 475                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 476
 477         /* Length must match exact page count */
 478         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 479                 return -EINVAL;
 480         }
 481
 482         if (!capable(CAP_SYS_ADMIN) &&
 483             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 484                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 485 #if defined(__i386__) || defined(__x86_64__)
 486                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 487 #else
 488                 /* Ye gads this is ugly.  With more thought
 489                    we could move this up higher and use
 490                    `protection_map' instead.  */
 491                 vma->vm_page_prot =
 492                     __pgprot(pte_val
 493                              (pte_wrprotect
 494                               (__pte(pgprot_val(vma->vm_page_prot)))));
 495 #endif
 496         }
 497
 498         vma->vm_ops = &drm_vm_dma_ops;
 499
 500         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 501
 502         drm_vm_open_locked(dev, vma);
 503         return 0;
 504 }
 505
 506 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 507 {
 508 #ifdef __alpha__
 509         return dev->hose->dense_mem_base;
 510 #else
 511         return 0;
 512 #endif
 513 }
 514
 515 /*
 516  * mmap DMA memory.
 517  *
 518  * \param file_priv DRM file private.
 519  * \param vma virtual memory area.
 520  * \return zero on success or a negative number on failure.
 521  *
 522  * If the virtual memory area has no offset associated with it then it's a DMA
 523  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 524  * checks that the restricted flag is not set, sets the virtual memory operations
 525  * according to the mapping type and remaps the pages. Finally sets the file
 526  * pointer and calls vm_open().
 527  */
 528 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 529 {
 530         struct drm_file *priv = filp->private_data;
 531         struct drm_device *dev = priv->minor->dev;
 532         struct drm_local_map *map = NULL;
 533         resource_size_t offset = 0;
 534         struct drm_hash_item *hash;
 535
 536         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 537                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 538
 539         if (!priv->authenticated)
 540                 return -EACCES;
 541
 542         /* We check for "dma". On Apple's UniNorth, it's valid to have
 543          * the AGP mapped at physical address 0
 544          * --BenH.
 545          */
 546         if (!vma->vm_pgoff
 547 #if IS_ENABLED(CONFIG_AGP)
 548             && (!dev->agp
 549                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 550 #endif
 551             )
 552                 return drm_mmap_dma(filp, vma);
 553
 554         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 555                 DRM_ERROR("Could not find map\n");
 556                 return -EINVAL;
 557         }
 558
 559         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 560         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 561                 return -EPERM;
 562
 563         /* Check for valid size. */
 564         if (map->size < vma->vm_end - vma->vm_start)
 565                 return -EINVAL;
 566
 567         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 568                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 569 #if defined(__i386__) || defined(__x86_64__)
 570                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 571 #else
 572                 /* Ye gads this is ugly.  With more thought
 573                    we could move this up higher and use
 574                    `protection_map' instead.  */
 575                 vma->vm_page_prot =
 576                     __pgprot(pte_val
 577                              (pte_wrprotect
 578                               (__pte(pgprot_val(vma->vm_page_prot)))));
 579 #endif
 580         }
 581
 582         switch (map->type) {
 583 #if !defined(__arm__)
 584         case _DRM_AGP:
 585                 if (dev->agp && dev->agp->cant_use_aperture) {
 586                         /*
 587                          * On some platforms we can't talk to bus dma address from the CPU, so for
 588                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 589                          * pages and mappings in fault()
 590                          */
 591 #if defined(__powerpc__)
 592                         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 593 #endif
 594                         vma->vm_ops = &drm_vm_ops;
 595                         break;
 596                 }
 597                 fallthrough;    /* to _DRM_FRAME_BUFFER... */
 598 #endif
 599         case _DRM_FRAME_BUFFER:
 600         case _DRM_REGISTERS:
 601                 offset = drm_core_get_reg_ofs(dev);
 602                 vma->vm_page_prot = drm_io_prot(map, vma);
 603                 if (io_remap_pfn_range(vma, vma->vm_start,
 604                                        (map->offset + offset) >> PAGE_SHIFT,
 605                                        vma->vm_end - vma->vm_start,
 606                                        vma->vm_page_prot))
 607                         return -EAGAIN;
 608                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 609                           " offset = 0x%llx\n",
 610                           map->type,
 611                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
 612
 613                 vma->vm_ops = &drm_vm_ops;
 614                 break;
 615         case _DRM_CONSISTENT:
 616                 /* Consistent memory is really like shared memory. But
 617                  * it's allocated in a different way, so avoid fault */
 618                 if (remap_pfn_range(vma, vma->vm_start,
 619                     page_to_pfn(virt_to_page(map->handle)),
 620                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 621                         return -EAGAIN;
 622                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 623                 fallthrough;    /* to _DRM_SHM */
 624         case _DRM_SHM:
 625                 vma->vm_ops = &drm_vm_shm_ops;
 626                 vma->vm_private_data = (void *)map;
 627                 break;
 628         case _DRM_SCATTER_GATHER:
 629                 vma->vm_ops = &drm_vm_sg_ops;
 630                 vma->vm_private_data = (void *)map;
 631                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 632                 break;
 633         default:
 634                 return -EINVAL; /* This should never happen. */
 635         }
 636         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 637
 638         drm_vm_open_locked(dev, vma);
 639         return 0;
 640 }
 641
 642 int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
 643 {
 644         struct drm_file *priv = filp->private_data;
 645         struct drm_device *dev = priv->minor->dev;
 646         int ret;
 647
 648         if (drm_dev_is_unplugged(dev))
 649                 return -ENODEV;
 650
 651         mutex_lock(&dev->struct_mutex);
 652         ret = drm_mmap_locked(filp, vma);
 653         mutex_unlock(&dev->struct_mutex);
 654
 655         return ret;
 656 }
 657 EXPORT_SYMBOL(drm_legacy_mmap);
 658
 659 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 660 void drm_legacy_vma_flush(struct drm_device *dev)
 661 {
 662         struct drm_vma_entry *vma, *vma_temp;
 663
 664         /* Clear vma list (only needed for legacy drivers) */
 665         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 666                 list_del(&vma->head);
 667                 kfree(vma);
 668         }
 669 }
 670 #endif