drivers/gpu/drm/drm_vm.c

   1 /**
   2  * \file drm_vm.c
   3  * Memory mapping for DRM
   4  *
   5  * \author Rickard E. (Rik) Faith <[email protected]>
   6  * \author Gareth Hughes <[email protected]>
   7  */
   8
   9 /*
  10  * Created: Mon Jan  4 08:58:31 1999 by [email protected]
  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
  41 #if defined(__ia64__)
  42 #include <linux/efi.h>
  43 #include <linux/slab.h>
  44 #endif
  45 #include <linux/mem_encrypt.h>
  46
  47 #include <asm/pgtable.h>
  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_gem.h>
  55 #include <drm/drm_print.h>
  56
  57 #include "drm_internal.h"
  58 #include "drm_legacy.h"
  59
  60 struct drm_vma_entry {
  61         struct list_head head;
  62         struct vm_area_struct *vma;
  63         pid_t pid;
  64 };
  65
  66 static void drm_vm_open(struct vm_area_struct *vma);
  67 static void drm_vm_close(struct vm_area_struct *vma);
  68
  69 static pgprot_t drm_io_prot(struct drm_local_map *map,
  70                             struct vm_area_struct *vma)
  71 {
  72         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  73
  74         /* We don't want graphics memory to be mapped encrypted */
  75         tmp = pgprot_decrypted(tmp);
  76
  77 #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__)
  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__) || defined(__mips__)
  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                         drm_dma_handle_t dmah;
 272
 273                         switch (map->type) {
 274                         case _DRM_REGISTERS:
 275                         case _DRM_FRAME_BUFFER:
 276                                 arch_phys_wc_del(map->mtrr);
 277                                 iounmap(map->handle);
 278                                 break;
 279                         case _DRM_SHM:
 280                                 vfree(map->handle);
 281                                 break;
 282                         case _DRM_AGP:
 283                         case _DRM_SCATTER_GATHER:
 284                                 break;
 285                         case _DRM_CONSISTENT:
 286                                 dmah.vaddr = map->handle;
 287                                 dmah.busaddr = map->offset;
 288                                 dmah.size = map->size;
 289                                 __drm_legacy_pci_free(dev, &dmah);
 290                                 break;
 291                         }
 292                         kfree(map);
 293                 }
 294         }
 295         mutex_unlock(&dev->struct_mutex);
 296 }
 297
 298 /**
 299  * \c fault method for DMA virtual memory.
 300  *
 301  * \param address access address.
 302  * \return pointer to the page structure.
 303  *
 304  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 305  */
 306 static vm_fault_t drm_vm_dma_fault(struct vm_fault *vmf)
 307 {
 308         struct vm_area_struct *vma = vmf->vma;
 309         struct drm_file *priv = vma->vm_file->private_data;
 310         struct drm_device *dev = priv->minor->dev;
 311         struct drm_device_dma *dma = dev->dma;
 312         unsigned long offset;
 313         unsigned long page_nr;
 314         struct page *page;
 315
 316         if (!dma)
 317                 return VM_FAULT_SIGBUS; /* Error */
 318         if (!dma->pagelist)
 319                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 320
 321         offset = vmf->address - vma->vm_start;
 322                                         /* vm_[pg]off[set] should be 0 */
 323         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 324         page = virt_to_page((void *)dma->pagelist[page_nr]);
 325
 326         get_page(page);
 327         vmf->page = page;
 328
 329         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 330         return 0;
 331 }
 332
 333 /**
 334  * \c fault method for scatter-gather virtual memory.
 335  *
 336  * \param address access address.
 337  * \return pointer to the page structure.
 338  *
 339  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 340  */
 341 static vm_fault_t drm_vm_sg_fault(struct vm_fault *vmf)
 342 {
 343         struct vm_area_struct *vma = vmf->vma;
 344         struct drm_local_map *map = vma->vm_private_data;
 345         struct drm_file *priv = vma->vm_file->private_data;
 346         struct drm_device *dev = priv->minor->dev;
 347         struct drm_sg_mem *entry = dev->sg;
 348         unsigned long offset;
 349         unsigned long map_offset;
 350         unsigned long page_offset;
 351         struct page *page;
 352
 353         if (!entry)
 354                 return VM_FAULT_SIGBUS; /* Error */
 355         if (!entry->pagelist)
 356                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 357
 358         offset = vmf->address - vma->vm_start;
 359         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 360         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 361         page = entry->pagelist[page_offset];
 362         get_page(page);
 363         vmf->page = page;
 364
 365         return 0;
 366 }
 367
 368 /** AGP virtual memory operations */
 369 static const struct vm_operations_struct drm_vm_ops = {
 370         .fault = drm_vm_fault,
 371         .open = drm_vm_open,
 372         .close = drm_vm_close,
 373 };
 374
 375 /** Shared virtual memory operations */
 376 static const struct vm_operations_struct drm_vm_shm_ops = {
 377         .fault = drm_vm_shm_fault,
 378         .open = drm_vm_open,
 379         .close = drm_vm_shm_close,
 380 };
 381
 382 /** DMA virtual memory operations */
 383 static const struct vm_operations_struct drm_vm_dma_ops = {
 384         .fault = drm_vm_dma_fault,
 385         .open = drm_vm_open,
 386         .close = drm_vm_close,
 387 };
 388
 389 /** Scatter-gather virtual memory operations */
 390 static const struct vm_operations_struct drm_vm_sg_ops = {
 391         .fault = drm_vm_sg_fault,
 392         .open = drm_vm_open,
 393         .close = drm_vm_close,
 394 };
 395
 396 static void drm_vm_open_locked(struct drm_device *dev,
 397                                struct vm_area_struct *vma)
 398 {
 399         struct drm_vma_entry *vma_entry;
 400
 401         DRM_DEBUG("0x%08lx,0x%08lx\n",
 402                   vma->vm_start, vma->vm_end - vma->vm_start);
 403
 404         vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 405         if (vma_entry) {
 406                 vma_entry->vma = vma;
 407                 vma_entry->pid = current->pid;
 408                 list_add(&vma_entry->head, &dev->vmalist);
 409         }
 410 }
 411
 412 static void drm_vm_open(struct vm_area_struct *vma)
 413 {
 414         struct drm_file *priv = vma->vm_file->private_data;
 415         struct drm_device *dev = priv->minor->dev;
 416
 417         mutex_lock(&dev->struct_mutex);
 418         drm_vm_open_locked(dev, vma);
 419         mutex_unlock(&dev->struct_mutex);
 420 }
 421
 422 static void drm_vm_close_locked(struct drm_device *dev,
 423                                 struct vm_area_struct *vma)
 424 {
 425         struct drm_vma_entry *pt, *temp;
 426
 427         DRM_DEBUG("0x%08lx,0x%08lx\n",
 428                   vma->vm_start, vma->vm_end - vma->vm_start);
 429
 430         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 431                 if (pt->vma == vma) {
 432                         list_del(&pt->head);
 433                         kfree(pt);
 434                         break;
 435                 }
 436         }
 437 }
 438
 439 /**
 440  * \c close method for all virtual memory types.
 441  *
 442  * \param vma virtual memory area.
 443  *
 444  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 445  * free it.
 446  */
 447 static void drm_vm_close(struct vm_area_struct *vma)
 448 {
 449         struct drm_file *priv = vma->vm_file->private_data;
 450         struct drm_device *dev = priv->minor->dev;
 451
 452         mutex_lock(&dev->struct_mutex);
 453         drm_vm_close_locked(dev, vma);
 454         mutex_unlock(&dev->struct_mutex);
 455 }
 456
 457 /**
 458  * mmap DMA memory.
 459  *
 460  * \param file_priv DRM file private.
 461  * \param vma virtual memory area.
 462  * \return zero on success or a negative number on failure.
 463  *
 464  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 465  * pointer, and calls vm_open().
 466  */
 467 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 468 {
 469         struct drm_file *priv = filp->private_data;
 470         struct drm_device *dev;
 471         struct drm_device_dma *dma;
 472         unsigned long length = vma->vm_end - vma->vm_start;
 473
 474         dev = priv->minor->dev;
 475         dma = dev->dma;
 476         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 477                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 478
 479         /* Length must match exact page count */
 480         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 481                 return -EINVAL;
 482         }
 483
 484         if (!capable(CAP_SYS_ADMIN) &&
 485             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 486                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 487 #if defined(__i386__) || defined(__x86_64__)
 488                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 489 #else
 490                 /* Ye gads this is ugly.  With more thought
 491                    we could move this up higher and use
 492                    `protection_map' instead.  */
 493                 vma->vm_page_prot =
 494                     __pgprot(pte_val
 495                              (pte_wrprotect
 496                               (__pte(pgprot_val(vma->vm_page_prot)))));
 497 #endif
 498         }
 499
 500         vma->vm_ops = &drm_vm_dma_ops;
 501
 502         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 503
 504         drm_vm_open_locked(dev, vma);
 505         return 0;
 506 }
 507
 508 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 509 {
 510 #ifdef __alpha__
 511         return dev->hose->dense_mem_base;
 512 #else
 513         return 0;
 514 #endif
 515 }
 516
 517 /**
 518  * mmap DMA memory.
 519  *
 520  * \param file_priv DRM file private.
 521  * \param vma virtual memory area.
 522  * \return zero on success or a negative number on failure.
 523  *
 524  * If the virtual memory area has no offset associated with it then it's a DMA
 525  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 526  * checks that the restricted flag is not set, sets the virtual memory operations
 527  * according to the mapping type and remaps the pages. Finally sets the file
 528  * pointer and calls vm_open().
 529  */
 530 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 531 {
 532         struct drm_file *priv = filp->private_data;
 533         struct drm_device *dev = priv->minor->dev;
 534         struct drm_local_map *map = NULL;
 535         resource_size_t offset = 0;
 536         struct drm_hash_item *hash;
 537
 538         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 539                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 540
 541         if (!priv->authenticated)
 542                 return -EACCES;
 543
 544         /* We check for "dma". On Apple's UniNorth, it's valid to have
 545          * the AGP mapped at physical address 0
 546          * --BenH.
 547          */
 548         if (!vma->vm_pgoff
 549 #if IS_ENABLED(CONFIG_AGP)
 550             && (!dev->agp
 551                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 552 #endif
 553             )
 554                 return drm_mmap_dma(filp, vma);
 555
 556         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 557                 DRM_ERROR("Could not find map\n");
 558                 return -EINVAL;
 559         }
 560
 561         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 562         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 563                 return -EPERM;
 564
 565         /* Check for valid size. */
 566         if (map->size < vma->vm_end - vma->vm_start)
 567                 return -EINVAL;
 568
 569         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 570                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 571 #if defined(__i386__) || defined(__x86_64__)
 572                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 573 #else
 574                 /* Ye gads this is ugly.  With more thought
 575                    we could move this up higher and use
 576                    `protection_map' instead.  */
 577                 vma->vm_page_prot =
 578                     __pgprot(pte_val
 579                              (pte_wrprotect
 580                               (__pte(pgprot_val(vma->vm_page_prot)))));
 581 #endif
 582         }
 583
 584         switch (map->type) {
 585 #if !defined(__arm__)
 586         case _DRM_AGP:
 587                 if (dev->agp && dev->agp->cant_use_aperture) {
 588                         /*
 589                          * On some platforms we can't talk to bus dma address from the CPU, so for
 590                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 591                          * pages and mappings in fault()
 592                          */
 593 #if defined(__powerpc__)
 594                         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 595 #endif
 596                         vma->vm_ops = &drm_vm_ops;
 597                         break;
 598                 }
 599 #endif
 600                 /* fall through - to _DRM_FRAME_BUFFER... */
 601         case _DRM_FRAME_BUFFER:
 602         case _DRM_REGISTERS:
 603                 offset = drm_core_get_reg_ofs(dev);
 604                 vma->vm_page_prot = drm_io_prot(map, vma);
 605                 if (io_remap_pfn_range(vma, vma->vm_start,
 606                                        (map->offset + offset) >> PAGE_SHIFT,
 607                                        vma->vm_end - vma->vm_start,
 608                                        vma->vm_page_prot))
 609                         return -EAGAIN;
 610                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 611                           " offset = 0x%llx\n",
 612                           map->type,
 613                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
 614
 615                 vma->vm_ops = &drm_vm_ops;
 616                 break;
 617         case _DRM_CONSISTENT:
 618                 /* Consistent memory is really like shared memory. But
 619                  * it's allocated in a different way, so avoid fault */
 620                 if (remap_pfn_range(vma, vma->vm_start,
 621                     page_to_pfn(virt_to_page(map->handle)),
 622                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 623                         return -EAGAIN;
 624                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 625                 /* fall through - to _DRM_SHM */
 626         case _DRM_SHM:
 627                 vma->vm_ops = &drm_vm_shm_ops;
 628                 vma->vm_private_data = (void *)map;
 629                 break;
 630         case _DRM_SCATTER_GATHER:
 631                 vma->vm_ops = &drm_vm_sg_ops;
 632                 vma->vm_private_data = (void *)map;
 633                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 634                 break;
 635         default:
 636                 return -EINVAL; /* This should never happen. */
 637         }
 638         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 639
 640         drm_vm_open_locked(dev, vma);
 641         return 0;
 642 }
 643
 644 int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
 645 {
 646         struct drm_file *priv = filp->private_data;
 647         struct drm_device *dev = priv->minor->dev;
 648         int ret;
 649
 650         if (drm_dev_is_unplugged(dev))
 651                 return -ENODEV;
 652
 653         mutex_lock(&dev->struct_mutex);
 654         ret = drm_mmap_locked(filp, vma);
 655         mutex_unlock(&dev->struct_mutex);
 656
 657         return ret;
 658 }
 659 EXPORT_SYMBOL(drm_legacy_mmap);
 660
 661 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 662 void drm_legacy_vma_flush(struct drm_device *dev)
 663 {
 664         struct drm_vma_entry *vma, *vma_temp;
 665
 666         /* Clear vma list (only needed for legacy drivers) */
 667         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 668                 list_del(&vma->head);
 669                 kfree(vma);
 670         }
 671 }
 672 #endif