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