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