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