drm_vm.c revision f0f37e2f77731b3473fa6bd5ee53255d9a9cdb40
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 "drmP.h" 37#if defined(__ia64__) 38#include <linux/efi.h> 39#endif 40 41static void drm_vm_open(struct vm_area_struct *vma); 42static void drm_vm_close(struct vm_area_struct *vma); 43 44static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma) 45{ 46 pgprot_t tmp = vm_get_page_prot(vma->vm_flags); 47 48#if defined(__i386__) || defined(__x86_64__) 49 if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) { 50 pgprot_val(tmp) |= _PAGE_PCD; 51 pgprot_val(tmp) &= ~_PAGE_PWT; 52 } 53#elif defined(__powerpc__) 54 pgprot_val(tmp) |= _PAGE_NO_CACHE; 55 if (map_type == _DRM_REGISTERS) 56 pgprot_val(tmp) |= _PAGE_GUARDED; 57#elif defined(__ia64__) 58 if (efi_range_is_wc(vma->vm_start, vma->vm_end - 59 vma->vm_start)) 60 tmp = pgprot_writecombine(tmp); 61 else 62 tmp = pgprot_noncached(tmp); 63#elif defined(__sparc__) 64 tmp = pgprot_noncached(tmp); 65#endif 66 return tmp; 67} 68 69static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) 70{ 71 pgprot_t tmp = vm_get_page_prot(vma->vm_flags); 72 73#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) 74 tmp |= _PAGE_NO_CACHE; 75#endif 76 return tmp; 77} 78 79/** 80 * \c fault method for AGP virtual memory. 81 * 82 * \param vma virtual memory area. 83 * \param address access address. 84 * \return pointer to the page structure. 85 * 86 * Find the right map and if it's AGP memory find the real physical page to 87 * map, get the page, increment the use count and return it. 88 */ 89#if __OS_HAS_AGP 90static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 91{ 92 struct drm_file *priv = vma->vm_file->private_data; 93 struct drm_device *dev = priv->minor->dev; 94 struct drm_local_map *map = NULL; 95 struct drm_map_list *r_list; 96 struct drm_hash_item *hash; 97 98 /* 99 * Find the right map 100 */ 101 if (!drm_core_has_AGP(dev)) 102 goto vm_fault_error; 103 104 if (!dev->agp || !dev->agp->cant_use_aperture) 105 goto vm_fault_error; 106 107 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) 108 goto vm_fault_error; 109 110 r_list = drm_hash_entry(hash, struct drm_map_list, hash); 111 map = r_list->map; 112 113 if (map && map->type == _DRM_AGP) { 114 /* 115 * Using vm_pgoff as a selector forces us to use this unusual 116 * addressing scheme. 117 */ 118 resource_size_t offset = (unsigned long)vmf->virtual_address - 119 vma->vm_start; 120 resource_size_t baddr = map->offset + offset; 121 struct drm_agp_mem *agpmem; 122 struct page *page; 123 124#ifdef __alpha__ 125 /* 126 * Adjust to a bus-relative address 127 */ 128 baddr -= dev->hose->mem_space->start; 129#endif 130 131 /* 132 * It's AGP memory - find the real physical page to map 133 */ 134 list_for_each_entry(agpmem, &dev->agp->memory, head) { 135 if (agpmem->bound <= baddr && 136 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) 137 break; 138 } 139 140 if (!agpmem) 141 goto vm_fault_error; 142 143 /* 144 * Get the page, inc the use count, and return it 145 */ 146 offset = (baddr - agpmem->bound) >> PAGE_SHIFT; 147 page = agpmem->memory->pages[offset]; 148 get_page(page); 149 vmf->page = page; 150 151 DRM_DEBUG 152 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n", 153 (unsigned long long)baddr, 154 agpmem->memory->pages[offset], 155 (unsigned long long)offset, 156 page_count(page)); 157 return 0; 158 } 159vm_fault_error: 160 return VM_FAULT_SIGBUS; /* Disallow mremap */ 161} 162#else /* __OS_HAS_AGP */ 163static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 164{ 165 return VM_FAULT_SIGBUS; 166} 167#endif /* __OS_HAS_AGP */ 168 169/** 170 * \c nopage method for shared virtual memory. 171 * 172 * \param vma virtual memory area. 173 * \param address access address. 174 * \return pointer to the page structure. 175 * 176 * Get the mapping, find the real physical page to map, get the page, and 177 * return it. 178 */ 179static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 180{ 181 struct drm_local_map *map = vma->vm_private_data; 182 unsigned long offset; 183 unsigned long i; 184 struct page *page; 185 186 if (!map) 187 return VM_FAULT_SIGBUS; /* Nothing allocated */ 188 189 offset = (unsigned long)vmf->virtual_address - vma->vm_start; 190 i = (unsigned long)map->handle + offset; 191 page = vmalloc_to_page((void *)i); 192 if (!page) 193 return VM_FAULT_SIGBUS; 194 get_page(page); 195 vmf->page = page; 196 197 DRM_DEBUG("shm_fault 0x%lx\n", offset); 198 return 0; 199} 200 201/** 202 * \c close method for shared virtual memory. 203 * 204 * \param vma virtual memory area. 205 * 206 * Deletes map information if we are the last 207 * person to close a mapping and it's not in the global maplist. 208 */ 209static void drm_vm_shm_close(struct vm_area_struct *vma) 210{ 211 struct drm_file *priv = vma->vm_file->private_data; 212 struct drm_device *dev = priv->minor->dev; 213 struct drm_vma_entry *pt, *temp; 214 struct drm_local_map *map; 215 struct drm_map_list *r_list; 216 int found_maps = 0; 217 218 DRM_DEBUG("0x%08lx,0x%08lx\n", 219 vma->vm_start, vma->vm_end - vma->vm_start); 220 atomic_dec(&dev->vma_count); 221 222 map = vma->vm_private_data; 223 224 mutex_lock(&dev->struct_mutex); 225 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { 226 if (pt->vma->vm_private_data == map) 227 found_maps++; 228 if (pt->vma == vma) { 229 list_del(&pt->head); 230 kfree(pt); 231 } 232 } 233 234 /* We were the only map that was found */ 235 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { 236 /* Check to see if we are in the maplist, if we are not, then 237 * we delete this mappings information. 238 */ 239 found_maps = 0; 240 list_for_each_entry(r_list, &dev->maplist, head) { 241 if (r_list->map == map) 242 found_maps++; 243 } 244 245 if (!found_maps) { 246 drm_dma_handle_t dmah; 247 248 switch (map->type) { 249 case _DRM_REGISTERS: 250 case _DRM_FRAME_BUFFER: 251 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { 252 int retcode; 253 retcode = mtrr_del(map->mtrr, 254 map->offset, 255 map->size); 256 DRM_DEBUG("mtrr_del = %d\n", retcode); 257 } 258 iounmap(map->handle); 259 break; 260 case _DRM_SHM: 261 vfree(map->handle); 262 break; 263 case _DRM_AGP: 264 case _DRM_SCATTER_GATHER: 265 break; 266 case _DRM_CONSISTENT: 267 dmah.vaddr = map->handle; 268 dmah.busaddr = map->offset; 269 dmah.size = map->size; 270 __drm_pci_free(dev, &dmah); 271 break; 272 case _DRM_GEM: 273 DRM_ERROR("tried to rmmap GEM object\n"); 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 vma virtual memory area. 286 * \param address access address. 287 * \return pointer to the page structure. 288 * 289 * Determine the page number from the page offset and get it from drm_device_dma::pagelist. 290 */ 291static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 292{ 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 = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ 306 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ 307 page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); 308 309 get_page(page); 310 vmf->page = page; 311 312 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); 313 return 0; 314} 315 316/** 317 * \c fault method for scatter-gather virtual memory. 318 * 319 * \param vma virtual memory area. 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 */ 325static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 326{ 327 struct drm_local_map *map = vma->vm_private_data; 328 struct drm_file *priv = vma->vm_file->private_data; 329 struct drm_device *dev = priv->minor->dev; 330 struct drm_sg_mem *entry = dev->sg; 331 unsigned long offset; 332 unsigned long map_offset; 333 unsigned long page_offset; 334 struct page *page; 335 336 if (!entry) 337 return VM_FAULT_SIGBUS; /* Error */ 338 if (!entry->pagelist) 339 return VM_FAULT_SIGBUS; /* Nothing allocated */ 340 341 offset = (unsigned long)vmf->virtual_address - vma->vm_start; 342 map_offset = map->offset - (unsigned long)dev->sg->virtual; 343 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); 344 page = entry->pagelist[page_offset]; 345 get_page(page); 346 vmf->page = page; 347 348 return 0; 349} 350 351static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 352{ 353 return drm_do_vm_fault(vma, vmf); 354} 355 356static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 357{ 358 return drm_do_vm_shm_fault(vma, vmf); 359} 360 361static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 362{ 363 return drm_do_vm_dma_fault(vma, vmf); 364} 365 366static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 367{ 368 return drm_do_vm_sg_fault(vma, vmf); 369} 370 371/** AGP virtual memory operations */ 372static const struct vm_operations_struct drm_vm_ops = { 373 .fault = drm_vm_fault, 374 .open = drm_vm_open, 375 .close = drm_vm_close, 376}; 377 378/** Shared virtual memory operations */ 379static const struct vm_operations_struct drm_vm_shm_ops = { 380 .fault = drm_vm_shm_fault, 381 .open = drm_vm_open, 382 .close = drm_vm_shm_close, 383}; 384 385/** DMA virtual memory operations */ 386static const struct vm_operations_struct drm_vm_dma_ops = { 387 .fault = drm_vm_dma_fault, 388 .open = drm_vm_open, 389 .close = drm_vm_close, 390}; 391 392/** Scatter-gather virtual memory operations */ 393static const struct vm_operations_struct drm_vm_sg_ops = { 394 .fault = drm_vm_sg_fault, 395 .open = drm_vm_open, 396 .close = drm_vm_close, 397}; 398 399/** 400 * \c open method for shared virtual memory. 401 * 402 * \param vma virtual memory area. 403 * 404 * Create a new drm_vma_entry structure as the \p vma private data entry and 405 * add it to drm_device::vmalist. 406 */ 407void drm_vm_open_locked(struct vm_area_struct *vma) 408{ 409 struct drm_file *priv = vma->vm_file->private_data; 410 struct drm_device *dev = priv->minor->dev; 411 struct drm_vma_entry *vma_entry; 412 413 DRM_DEBUG("0x%08lx,0x%08lx\n", 414 vma->vm_start, vma->vm_end - vma->vm_start); 415 atomic_inc(&dev->vma_count); 416 417 vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL); 418 if (vma_entry) { 419 vma_entry->vma = vma; 420 vma_entry->pid = current->pid; 421 list_add(&vma_entry->head, &dev->vmalist); 422 } 423} 424 425static void drm_vm_open(struct vm_area_struct *vma) 426{ 427 struct drm_file *priv = vma->vm_file->private_data; 428 struct drm_device *dev = priv->minor->dev; 429 430 mutex_lock(&dev->struct_mutex); 431 drm_vm_open_locked(vma); 432 mutex_unlock(&dev->struct_mutex); 433} 434 435/** 436 * \c close method for all virtual memory types. 437 * 438 * \param vma virtual memory area. 439 * 440 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and 441 * free it. 442 */ 443static void drm_vm_close(struct vm_area_struct *vma) 444{ 445 struct drm_file *priv = vma->vm_file->private_data; 446 struct drm_device *dev = priv->minor->dev; 447 struct drm_vma_entry *pt, *temp; 448 449 DRM_DEBUG("0x%08lx,0x%08lx\n", 450 vma->vm_start, vma->vm_end - vma->vm_start); 451 atomic_dec(&dev->vma_count); 452 453 mutex_lock(&dev->struct_mutex); 454 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { 455 if (pt->vma == vma) { 456 list_del(&pt->head); 457 kfree(pt); 458 break; 459 } 460 } 461 mutex_unlock(&dev->struct_mutex); 462} 463 464/** 465 * mmap DMA memory. 466 * 467 * \param file_priv DRM file private. 468 * \param vma virtual memory area. 469 * \return zero on success or a negative number on failure. 470 * 471 * Sets the virtual memory area operations structure to vm_dma_ops, the file 472 * pointer, and calls vm_open(). 473 */ 474static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) 475{ 476 struct drm_file *priv = filp->private_data; 477 struct drm_device *dev; 478 struct drm_device_dma *dma; 479 unsigned long length = vma->vm_end - vma->vm_start; 480 481 dev = priv->minor->dev; 482 dma = dev->dma; 483 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", 484 vma->vm_start, vma->vm_end, vma->vm_pgoff); 485 486 /* Length must match exact page count */ 487 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { 488 return -EINVAL; 489 } 490 491 if (!capable(CAP_SYS_ADMIN) && 492 (dma->flags & _DRM_DMA_USE_PCI_RO)) { 493 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); 494#if defined(__i386__) || defined(__x86_64__) 495 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; 496#else 497 /* Ye gads this is ugly. With more thought 498 we could move this up higher and use 499 `protection_map' instead. */ 500 vma->vm_page_prot = 501 __pgprot(pte_val 502 (pte_wrprotect 503 (__pte(pgprot_val(vma->vm_page_prot))))); 504#endif 505 } 506 507 vma->vm_ops = &drm_vm_dma_ops; 508 509 vma->vm_flags |= VM_RESERVED; /* Don't swap */ 510 vma->vm_flags |= VM_DONTEXPAND; 511 512 vma->vm_file = filp; /* Needed for drm_vm_open() */ 513 drm_vm_open_locked(vma); 514 return 0; 515} 516 517resource_size_t drm_core_get_map_ofs(struct drm_local_map * map) 518{ 519 return map->offset; 520} 521 522EXPORT_SYMBOL(drm_core_get_map_ofs); 523 524resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) 525{ 526#ifdef __alpha__ 527 return dev->hose->dense_mem_base - dev->hose->mem_space->start; 528#else 529 return 0; 530#endif 531} 532 533EXPORT_SYMBOL(drm_core_get_reg_ofs); 534 535/** 536 * mmap DMA memory. 537 * 538 * \param file_priv DRM file private. 539 * \param vma virtual memory area. 540 * \return zero on success or a negative number on failure. 541 * 542 * If the virtual memory area has no offset associated with it then it's a DMA 543 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, 544 * checks that the restricted flag is not set, sets the virtual memory operations 545 * according to the mapping type and remaps the pages. Finally sets the file 546 * pointer and calls vm_open(). 547 */ 548int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) 549{ 550 struct drm_file *priv = filp->private_data; 551 struct drm_device *dev = priv->minor->dev; 552 struct drm_local_map *map = NULL; 553 resource_size_t offset = 0; 554 struct drm_hash_item *hash; 555 556 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", 557 vma->vm_start, vma->vm_end, vma->vm_pgoff); 558 559 if (!priv->authenticated) 560 return -EACCES; 561 562 /* We check for "dma". On Apple's UniNorth, it's valid to have 563 * the AGP mapped at physical address 0 564 * --BenH. 565 */ 566 if (!vma->vm_pgoff 567#if __OS_HAS_AGP 568 && (!dev->agp 569 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) 570#endif 571 ) 572 return drm_mmap_dma(filp, vma); 573 574 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { 575 DRM_ERROR("Could not find map\n"); 576 return -EINVAL; 577 } 578 579 map = drm_hash_entry(hash, struct drm_map_list, hash)->map; 580 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) 581 return -EPERM; 582 583 /* Check for valid size. */ 584 if (map->size < vma->vm_end - vma->vm_start) 585 return -EINVAL; 586 587 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { 588 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); 589#if defined(__i386__) || defined(__x86_64__) 590 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; 591#else 592 /* Ye gads this is ugly. With more thought 593 we could move this up higher and use 594 `protection_map' instead. */ 595 vma->vm_page_prot = 596 __pgprot(pte_val 597 (pte_wrprotect 598 (__pte(pgprot_val(vma->vm_page_prot))))); 599#endif 600 } 601 602 switch (map->type) { 603 case _DRM_AGP: 604 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { 605 /* 606 * On some platforms we can't talk to bus dma address from the CPU, so for 607 * memory of type DRM_AGP, we'll deal with sorting out the real physical 608 * pages and mappings in fault() 609 */ 610#if defined(__powerpc__) 611 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; 612#endif 613 vma->vm_ops = &drm_vm_ops; 614 break; 615 } 616 /* fall through to _DRM_FRAME_BUFFER... */ 617 case _DRM_FRAME_BUFFER: 618 case _DRM_REGISTERS: 619 offset = dev->driver->get_reg_ofs(dev); 620 vma->vm_flags |= VM_IO; /* not in core dump */ 621 vma->vm_page_prot = drm_io_prot(map->type, vma); 622 if (io_remap_pfn_range(vma, vma->vm_start, 623 (map->offset + offset) >> PAGE_SHIFT, 624 vma->vm_end - vma->vm_start, 625 vma->vm_page_prot)) 626 return -EAGAIN; 627 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," 628 " offset = 0x%llx\n", 629 map->type, 630 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset)); 631 vma->vm_ops = &drm_vm_ops; 632 break; 633 case _DRM_CONSISTENT: 634 /* Consistent memory is really like shared memory. But 635 * it's allocated in a different way, so avoid fault */ 636 if (remap_pfn_range(vma, vma->vm_start, 637 page_to_pfn(virt_to_page(map->handle)), 638 vma->vm_end - vma->vm_start, vma->vm_page_prot)) 639 return -EAGAIN; 640 vma->vm_page_prot = drm_dma_prot(map->type, vma); 641 /* fall through to _DRM_SHM */ 642 case _DRM_SHM: 643 vma->vm_ops = &drm_vm_shm_ops; 644 vma->vm_private_data = (void *)map; 645 /* Don't let this area swap. Change when 646 DRM_KERNEL advisory is supported. */ 647 vma->vm_flags |= VM_RESERVED; 648 break; 649 case _DRM_SCATTER_GATHER: 650 vma->vm_ops = &drm_vm_sg_ops; 651 vma->vm_private_data = (void *)map; 652 vma->vm_flags |= VM_RESERVED; 653 vma->vm_page_prot = drm_dma_prot(map->type, vma); 654 break; 655 default: 656 return -EINVAL; /* This should never happen. */ 657 } 658 vma->vm_flags |= VM_RESERVED; /* Don't swap */ 659 vma->vm_flags |= VM_DONTEXPAND; 660 661 vma->vm_file = filp; /* Needed for drm_vm_open() */ 662 drm_vm_open_locked(vma); 663 return 0; 664} 665 666int drm_mmap(struct file *filp, struct vm_area_struct *vma) 667{ 668 struct drm_file *priv = filp->private_data; 669 struct drm_device *dev = priv->minor->dev; 670 int ret; 671 672 mutex_lock(&dev->struct_mutex); 673 ret = drm_mmap_locked(filp, vma); 674 mutex_unlock(&dev->struct_mutex); 675 676 return ret; 677} 678EXPORT_SYMBOL(drm_mmap); 679