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 <linux/mem_encrypt.h>
  44 #include <asm/pgtable.h>
  45 #include "drm_internal.h"
  46 #include "drm_legacy.h"
  47
  48 struct drm_vma_entry {
  49         struct list_head head;
  50         struct vm_area_struct *vma;
  51         pid_t pid;
  52 };
  53
  54 static void drm_vm_open(struct vm_area_struct *vma);
  55 static void drm_vm_close(struct vm_area_struct *vma);
  56
  57 static pgprot_t drm_io_prot(struct drm_local_map *map,
  58                             struct vm_area_struct *vma)
  59 {
  60         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  61
  62         /* We don't want graphics memory to be mapped encrypted */
  63         tmp = pgprot_decrypted(tmp);
  64
  65 #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__)
  66         if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING))
  67                 tmp = pgprot_noncached(tmp);
  68         else
  69                 tmp = pgprot_writecombine(tmp);
  70 #elif defined(__ia64__)
  71         if (efi_range_is_wc(vma->vm_start, vma->vm_end -
  72                                     vma->vm_start))
  73                 tmp = pgprot_writecombine(tmp);
  74         else
  75                 tmp = pgprot_noncached(tmp);
  76 #elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
  77         tmp = pgprot_noncached(tmp);
  78 #endif
  79         return tmp;
  80 }
  81
  82 static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  83 {
  84         pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
  85
  86 #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
  87         tmp = pgprot_noncached_wc(tmp);
  88 #endif
  89         return tmp;
  90 }
  91
  92 /**
  93  * \c fault method for AGP virtual memory.
  94  *
  95  * \param vma virtual memory area.
  96  * \param address access address.
  97  * \return pointer to the page structure.
  98  *
  99  * Find the right map and if it's AGP memory find the real physical page to
 100  * map, get the page, increment the use count and return it.
 101  */
 102 #if IS_ENABLED(CONFIG_AGP)
 103 static int drm_vm_fault(struct vm_fault *vmf)
 104 {
 105         struct vm_area_struct *vma = vmf->vma;
 106         struct drm_file *priv = vma->vm_file->private_data;
 107         struct drm_device *dev = priv->minor->dev;
 108         struct drm_local_map *map = NULL;
 109         struct drm_map_list *r_list;
 110         struct drm_hash_item *hash;
 111
 112         /*
 113          * Find the right map
 114          */
 115         if (!dev->agp)
 116                 goto vm_fault_error;
 117
 118         if (!dev->agp || !dev->agp->cant_use_aperture)
 119                 goto vm_fault_error;
 120
 121         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
 122                 goto vm_fault_error;
 123
 124         r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 125         map = r_list->map;
 126
 127         if (map && map->type == _DRM_AGP) {
 128                 /*
 129                  * Using vm_pgoff as a selector forces us to use this unusual
 130                  * addressing scheme.
 131                  */
 132                 resource_size_t offset = vmf->address - vma->vm_start;
 133                 resource_size_t baddr = map->offset + offset;
 134                 struct drm_agp_mem *agpmem;
 135                 struct page *page;
 136
 137 #ifdef __alpha__
 138                 /*
 139                  * Adjust to a bus-relative address
 140                  */
 141                 baddr -= dev->hose->mem_space->start;
 142 #endif
 143
 144                 /*
 145                  * It's AGP memory - find the real physical page to map
 146                  */
 147                 list_for_each_entry(agpmem, &dev->agp->memory, head) {
 148                         if (agpmem->bound <= baddr &&
 149                             agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
 150                                 break;
 151                 }
 152
 153                 if (&agpmem->head == &dev->agp->memory)
 154                         goto vm_fault_error;
 155
 156                 /*
 157                  * Get the page, inc the use count, and return it
 158                  */
 159                 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 160                 page = agpmem->memory->pages[offset];
 161                 get_page(page);
 162                 vmf->page = page;
 163
 164                 DRM_DEBUG
 165                     ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
 166                      (unsigned long long)baddr,
 167                      agpmem->memory->pages[offset],
 168                      (unsigned long long)offset,
 169                      page_count(page));
 170                 return 0;
 171         }
 172 vm_fault_error:
 173         return VM_FAULT_SIGBUS; /* Disallow mremap */
 174 }
 175 #else
 176 static int drm_vm_fault(struct vm_fault *vmf)
 177 {
 178         return VM_FAULT_SIGBUS;
 179 }
 180 #endif
 181
 182 /**
 183  * \c nopage method for shared virtual memory.
 184  *
 185  * \param vma virtual memory area.
 186  * \param address access address.
 187  * \return pointer to the page structure.
 188  *
 189  * Get the mapping, find the real physical page to map, get the page, and
 190  * return it.
 191  */
 192 static int drm_vm_shm_fault(struct vm_fault *vmf)
 193 {
 194         struct vm_area_struct *vma = vmf->vma;
 195         struct drm_local_map *map = vma->vm_private_data;
 196         unsigned long offset;
 197         unsigned long i;
 198         struct page *page;
 199
 200         if (!map)
 201                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 202
 203         offset = vmf->address - vma->vm_start;
 204         i = (unsigned long)map->handle + offset;
 205         page = vmalloc_to_page((void *)i);
 206         if (!page)
 207                 return VM_FAULT_SIGBUS;
 208         get_page(page);
 209         vmf->page = page;
 210
 211         DRM_DEBUG("shm_fault 0x%lx\n", offset);
 212         return 0;
 213 }
 214
 215 /**
 216  * \c close method for shared virtual memory.
 217  *
 218  * \param vma virtual memory area.
 219  *
 220  * Deletes map information if we are the last
 221  * person to close a mapping and it's not in the global maplist.
 222  */
 223 static void drm_vm_shm_close(struct vm_area_struct *vma)
 224 {
 225         struct drm_file *priv = vma->vm_file->private_data;
 226         struct drm_device *dev = priv->minor->dev;
 227         struct drm_vma_entry *pt, *temp;
 228         struct drm_local_map *map;
 229         struct drm_map_list *r_list;
 230         int found_maps = 0;
 231
 232         DRM_DEBUG("0x%08lx,0x%08lx\n",
 233                   vma->vm_start, vma->vm_end - vma->vm_start);
 234
 235         map = vma->vm_private_data;
 236
 237         mutex_lock(&dev->struct_mutex);
 238         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 239                 if (pt->vma->vm_private_data == map)
 240                         found_maps++;
 241                 if (pt->vma == vma) {
 242                         list_del(&pt->head);
 243                         kfree(pt);
 244                 }
 245         }
 246
 247         /* We were the only map that was found */
 248         if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
 249                 /* Check to see if we are in the maplist, if we are not, then
 250                  * we delete this mappings information.
 251                  */
 252                 found_maps = 0;
 253                 list_for_each_entry(r_list, &dev->maplist, head) {
 254                         if (r_list->map == map)
 255                                 found_maps++;
 256                 }
 257
 258                 if (!found_maps) {
 259                         drm_dma_handle_t dmah;
 260
 261                         switch (map->type) {
 262                         case _DRM_REGISTERS:
 263                         case _DRM_FRAME_BUFFER:
 264                                 arch_phys_wc_del(map->mtrr);
 265                                 iounmap(map->handle);
 266                                 break;
 267                         case _DRM_SHM:
 268                                 vfree(map->handle);
 269                                 break;
 270                         case _DRM_AGP:
 271                         case _DRM_SCATTER_GATHER:
 272                                 break;
 273                         case _DRM_CONSISTENT:
 274                                 dmah.vaddr = map->handle;
 275                                 dmah.busaddr = map->offset;
 276                                 dmah.size = map->size;
 277                                 __drm_legacy_pci_free(dev, &dmah);
 278                                 break;
 279                         }
 280                         kfree(map);
 281                 }
 282         }
 283         mutex_unlock(&dev->struct_mutex);
 284 }
 285
 286 /**
 287  * \c fault method for DMA virtual memory.
 288  *
 289  * \param address access address.
 290  * \return pointer to the page structure.
 291  *
 292  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
 293  */
 294 static int drm_vm_dma_fault(struct vm_fault *vmf)
 295 {
 296         struct vm_area_struct *vma = vmf->vma;
 297         struct drm_file *priv = vma->vm_file->private_data;
 298         struct drm_device *dev = priv->minor->dev;
 299         struct drm_device_dma *dma = dev->dma;
 300         unsigned long offset;
 301         unsigned long page_nr;
 302         struct page *page;
 303
 304         if (!dma)
 305                 return VM_FAULT_SIGBUS; /* Error */
 306         if (!dma->pagelist)
 307                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 308
 309         offset = vmf->address - vma->vm_start;
 310                                         /* vm_[pg]off[set] should be 0 */
 311         page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 312         page = virt_to_page((void *)dma->pagelist[page_nr]);
 313
 314         get_page(page);
 315         vmf->page = page;
 316
 317         DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
 318         return 0;
 319 }
 320
 321 /**
 322  * \c fault method for scatter-gather virtual memory.
 323  *
 324  * \param address access address.
 325  * \return pointer to the page structure.
 326  *
 327  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
 328  */
 329 static int drm_vm_sg_fault(struct vm_fault *vmf)
 330 {
 331         struct vm_area_struct *vma = vmf->vma;
 332         struct drm_local_map *map = vma->vm_private_data;
 333         struct drm_file *priv = vma->vm_file->private_data;
 334         struct drm_device *dev = priv->minor->dev;
 335         struct drm_sg_mem *entry = dev->sg;
 336         unsigned long offset;
 337         unsigned long map_offset;
 338         unsigned long page_offset;
 339         struct page *page;
 340
 341         if (!entry)
 342                 return VM_FAULT_SIGBUS; /* Error */
 343         if (!entry->pagelist)
 344                 return VM_FAULT_SIGBUS; /* Nothing allocated */
 345
 346         offset = vmf->address - vma->vm_start;
 347         map_offset = map->offset - (unsigned long)dev->sg->virtual;
 348         page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 349         page = entry->pagelist[page_offset];
 350         get_page(page);
 351         vmf->page = page;
 352
 353         return 0;
 354 }
 355
 356 /** AGP virtual memory operations */
 357 static const struct vm_operations_struct drm_vm_ops = {
 358         .fault = drm_vm_fault,
 359         .open = drm_vm_open,
 360         .close = drm_vm_close,
 361 };
 362
 363 /** Shared virtual memory operations */
 364 static const struct vm_operations_struct drm_vm_shm_ops = {
 365         .fault = drm_vm_shm_fault,
 366         .open = drm_vm_open,
 367         .close = drm_vm_shm_close,
 368 };
 369
 370 /** DMA virtual memory operations */
 371 static const struct vm_operations_struct drm_vm_dma_ops = {
 372         .fault = drm_vm_dma_fault,
 373         .open = drm_vm_open,
 374         .close = drm_vm_close,
 375 };
 376
 377 /** Scatter-gather virtual memory operations */
 378 static const struct vm_operations_struct drm_vm_sg_ops = {
 379         .fault = drm_vm_sg_fault,
 380         .open = drm_vm_open,
 381         .close = drm_vm_close,
 382 };
 383
 384 static void drm_vm_open_locked(struct drm_device *dev,
 385                                struct vm_area_struct *vma)
 386 {
 387         struct drm_vma_entry *vma_entry;
 388
 389         DRM_DEBUG("0x%08lx,0x%08lx\n",
 390                   vma->vm_start, vma->vm_end - vma->vm_start);
 391
 392         vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 393         if (vma_entry) {
 394                 vma_entry->vma = vma;
 395                 vma_entry->pid = current->pid;
 396                 list_add(&vma_entry->head, &dev->vmalist);
 397         }
 398 }
 399
 400 static void drm_vm_open(struct vm_area_struct *vma)
 401 {
 402         struct drm_file *priv = vma->vm_file->private_data;
 403         struct drm_device *dev = priv->minor->dev;
 404
 405         mutex_lock(&dev->struct_mutex);
 406         drm_vm_open_locked(dev, vma);
 407         mutex_unlock(&dev->struct_mutex);
 408 }
 409
 410 static void drm_vm_close_locked(struct drm_device *dev,
 411                                 struct vm_area_struct *vma)
 412 {
 413         struct drm_vma_entry *pt, *temp;
 414
 415         DRM_DEBUG("0x%08lx,0x%08lx\n",
 416                   vma->vm_start, vma->vm_end - vma->vm_start);
 417
 418         list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 419                 if (pt->vma == vma) {
 420                         list_del(&pt->head);
 421                         kfree(pt);
 422                         break;
 423                 }
 424         }
 425 }
 426
 427 /**
 428  * \c close method for all virtual memory types.
 429  *
 430  * \param vma virtual memory area.
 431  *
 432  * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
 433  * free it.
 434  */
 435 static void drm_vm_close(struct vm_area_struct *vma)
 436 {
 437         struct drm_file *priv = vma->vm_file->private_data;
 438         struct drm_device *dev = priv->minor->dev;
 439
 440         mutex_lock(&dev->struct_mutex);
 441         drm_vm_close_locked(dev, vma);
 442         mutex_unlock(&dev->struct_mutex);
 443 }
 444
 445 /**
 446  * mmap DMA memory.
 447  *
 448  * \param file_priv DRM file private.
 449  * \param vma virtual memory area.
 450  * \return zero on success or a negative number on failure.
 451  *
 452  * Sets the virtual memory area operations structure to vm_dma_ops, the file
 453  * pointer, and calls vm_open().
 454  */
 455 static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 456 {
 457         struct drm_file *priv = filp->private_data;
 458         struct drm_device *dev;
 459         struct drm_device_dma *dma;
 460         unsigned long length = vma->vm_end - vma->vm_start;
 461
 462         dev = priv->minor->dev;
 463         dma = dev->dma;
 464         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 465                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 466
 467         /* Length must match exact page count */
 468         if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
 469                 return -EINVAL;
 470         }
 471
 472         if (!capable(CAP_SYS_ADMIN) &&
 473             (dma->flags & _DRM_DMA_USE_PCI_RO)) {
 474                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 475 #if defined(__i386__) || defined(__x86_64__)
 476                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 477 #else
 478                 /* Ye gads this is ugly.  With more thought
 479                    we could move this up higher and use
 480                    `protection_map' instead.  */
 481                 vma->vm_page_prot =
 482                     __pgprot(pte_val
 483                              (pte_wrprotect
 484                               (__pte(pgprot_val(vma->vm_page_prot)))));
 485 #endif
 486         }
 487
 488         vma->vm_ops = &drm_vm_dma_ops;
 489
 490         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 491
 492         drm_vm_open_locked(dev, vma);
 493         return 0;
 494 }
 495
 496 static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
 497 {
 498 #ifdef __alpha__
 499         return dev->hose->dense_mem_base;
 500 #else
 501         return 0;
 502 #endif
 503 }
 504
 505 /**
 506  * mmap DMA memory.
 507  *
 508  * \param file_priv DRM file private.
 509  * \param vma virtual memory area.
 510  * \return zero on success or a negative number on failure.
 511  *
 512  * If the virtual memory area has no offset associated with it then it's a DMA
 513  * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
 514  * checks that the restricted flag is not set, sets the virtual memory operations
 515  * according to the mapping type and remaps the pages. Finally sets the file
 516  * pointer and calls vm_open().
 517  */
 518 static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
 519 {
 520         struct drm_file *priv = filp->private_data;
 521         struct drm_device *dev = priv->minor->dev;
 522         struct drm_local_map *map = NULL;
 523         resource_size_t offset = 0;
 524         struct drm_hash_item *hash;
 525
 526         DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
 527                   vma->vm_start, vma->vm_end, vma->vm_pgoff);
 528
 529         if (!priv->authenticated)
 530                 return -EACCES;
 531
 532         /* We check for "dma". On Apple's UniNorth, it's valid to have
 533          * the AGP mapped at physical address 0
 534          * --BenH.
 535          */
 536         if (!vma->vm_pgoff
 537 #if IS_ENABLED(CONFIG_AGP)
 538             && (!dev->agp
 539                 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
 540 #endif
 541             )
 542                 return drm_mmap_dma(filp, vma);
 543
 544         if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
 545                 DRM_ERROR("Could not find map\n");
 546                 return -EINVAL;
 547         }
 548
 549         map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
 550         if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
 551                 return -EPERM;
 552
 553         /* Check for valid size. */
 554         if (map->size < vma->vm_end - vma->vm_start)
 555                 return -EINVAL;
 556
 557         if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
 558                 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
 559 #if defined(__i386__) || defined(__x86_64__)
 560                 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
 561 #else
 562                 /* Ye gads this is ugly.  With more thought
 563                    we could move this up higher and use
 564                    `protection_map' instead.  */
 565                 vma->vm_page_prot =
 566                     __pgprot(pte_val
 567                              (pte_wrprotect
 568                               (__pte(pgprot_val(vma->vm_page_prot)))));
 569 #endif
 570         }
 571
 572         switch (map->type) {
 573 #if !defined(__arm__)
 574         case _DRM_AGP:
 575                 if (dev->agp && dev->agp->cant_use_aperture) {
 576                         /*
 577                          * On some platforms we can't talk to bus dma address from the CPU, so for
 578                          * memory of type DRM_AGP, we'll deal with sorting out the real physical
 579                          * pages and mappings in fault()
 580                          */
 581 #if defined(__powerpc__)
 582                         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 583 #endif
 584                         vma->vm_ops = &drm_vm_ops;
 585                         break;
 586                 }
 587                 /* fall through to _DRM_FRAME_BUFFER... */
 588 #endif
 589         case _DRM_FRAME_BUFFER:
 590         case _DRM_REGISTERS:
 591                 offset = drm_core_get_reg_ofs(dev);
 592                 vma->vm_page_prot = drm_io_prot(map, vma);
 593                 if (io_remap_pfn_range(vma, vma->vm_start,
 594                                        (map->offset + offset) >> PAGE_SHIFT,
 595                                        vma->vm_end - vma->vm_start,
 596                                        vma->vm_page_prot))
 597                         return -EAGAIN;
 598                 DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
 599                           " offset = 0x%llx\n",
 600                           map->type,
 601                           vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
 602
 603                 vma->vm_ops = &drm_vm_ops;
 604                 break;
 605         case _DRM_CONSISTENT:
 606                 /* Consistent memory is really like shared memory. But
 607                  * it's allocated in a different way, so avoid fault */
 608                 if (remap_pfn_range(vma, vma->vm_start,
 609                     page_to_pfn(virt_to_page(map->handle)),
 610                     vma->vm_end - vma->vm_start, vma->vm_page_prot))
 611                         return -EAGAIN;
 612                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 613         /* fall through to _DRM_SHM */
 614         case _DRM_SHM:
 615                 vma->vm_ops = &drm_vm_shm_ops;
 616                 vma->vm_private_data = (void *)map;
 617                 break;
 618         case _DRM_SCATTER_GATHER:
 619                 vma->vm_ops = &drm_vm_sg_ops;
 620                 vma->vm_private_data = (void *)map;
 621                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
 622                 break;
 623         default:
 624                 return -EINVAL; /* This should never happen. */
 625         }
 626         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 627
 628         drm_vm_open_locked(dev, vma);
 629         return 0;
 630 }
 631
 632 int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma)
 633 {
 634         struct drm_file *priv = filp->private_data;
 635         struct drm_device *dev = priv->minor->dev;
 636         int ret;
 637
 638         if (drm_dev_is_unplugged(dev))
 639                 return -ENODEV;
 640
 641         mutex_lock(&dev->struct_mutex);
 642         ret = drm_mmap_locked(filp, vma);
 643         mutex_unlock(&dev->struct_mutex);
 644
 645         return ret;
 646 }
 647 EXPORT_SYMBOL(drm_legacy_mmap);
 648
 649 void drm_legacy_vma_flush(struct drm_device *dev)
 650 {
 651         struct drm_vma_entry *vma, *vma_temp;
 652
 653         /* Clear vma list (only needed for legacy drivers) */
 654         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 655                 list_del(&vma->head);
 656                 kfree(vma);
 657         }
 658 }