drm_vm.c revision f77d390c9779c496aa5b99ec832996fb76bb1d13
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 unsigned long offset = (unsigned long)vmf->virtual_address - 119 vma->vm_start; 120 unsigned long 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 = virt_to_page(__va(agpmem->memory->memory[offset])); 148 get_page(page); 149 vmf->page = page; 150 151 DRM_DEBUG 152 ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n", 153 baddr, __va(agpmem->memory->memory[offset]), offset, 154 page_count(page)); 155 return 0; 156 } 157vm_fault_error: 158 return VM_FAULT_SIGBUS; /* Disallow mremap */ 159} 160#else /* __OS_HAS_AGP */ 161static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 162{ 163 return VM_FAULT_SIGBUS; 164} 165#endif /* __OS_HAS_AGP */ 166 167/** 168 * \c nopage method for shared virtual memory. 169 * 170 * \param vma virtual memory area. 171 * \param address access address. 172 * \return pointer to the page structure. 173 * 174 * Get the mapping, find the real physical page to map, get the page, and 175 * return it. 176 */ 177static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 178{ 179 struct drm_local_map *map = vma->vm_private_data; 180 unsigned long offset; 181 unsigned long i; 182 struct page *page; 183 184 if (!map) 185 return VM_FAULT_SIGBUS; /* Nothing allocated */ 186 187 offset = (unsigned long)vmf->virtual_address - vma->vm_start; 188 i = (unsigned long)map->handle + offset; 189 page = vmalloc_to_page((void *)i); 190 if (!page) 191 return VM_FAULT_SIGBUS; 192 get_page(page); 193 vmf->page = page; 194 195 DRM_DEBUG("shm_fault 0x%lx\n", offset); 196 return 0; 197} 198 199/** 200 * \c close method for shared virtual memory. 201 * 202 * \param vma virtual memory area. 203 * 204 * Deletes map information if we are the last 205 * person to close a mapping and it's not in the global maplist. 206 */ 207static void drm_vm_shm_close(struct vm_area_struct *vma) 208{ 209 struct drm_file *priv = vma->vm_file->private_data; 210 struct drm_device *dev = priv->minor->dev; 211 struct drm_vma_entry *pt, *temp; 212 struct drm_local_map *map; 213 struct drm_map_list *r_list; 214 int found_maps = 0; 215 216 DRM_DEBUG("0x%08lx,0x%08lx\n", 217 vma->vm_start, vma->vm_end - vma->vm_start); 218 atomic_dec(&dev->vma_count); 219 220 map = vma->vm_private_data; 221 222 mutex_lock(&dev->struct_mutex); 223 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { 224 if (pt->vma->vm_private_data == map) 225 found_maps++; 226 if (pt->vma == vma) { 227 list_del(&pt->head); 228 drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); 229 } 230 } 231 232 /* We were the only map that was found */ 233 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { 234 /* Check to see if we are in the maplist, if we are not, then 235 * we delete this mappings information. 236 */ 237 found_maps = 0; 238 list_for_each_entry(r_list, &dev->maplist, head) { 239 if (r_list->map == map) 240 found_maps++; 241 } 242 243 if (!found_maps) { 244 drm_dma_handle_t dmah; 245 246 switch (map->type) { 247 case _DRM_REGISTERS: 248 case _DRM_FRAME_BUFFER: 249 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { 250 int retcode; 251 retcode = mtrr_del(map->mtrr, 252 map->offset, 253 map->size); 254 DRM_DEBUG("mtrr_del = %d\n", retcode); 255 } 256 iounmap(map->handle); 257 break; 258 case _DRM_SHM: 259 vfree(map->handle); 260 break; 261 case _DRM_AGP: 262 case _DRM_SCATTER_GATHER: 263 break; 264 case _DRM_CONSISTENT: 265 dmah.vaddr = map->handle; 266 dmah.busaddr = map->offset; 267 dmah.size = map->size; 268 __drm_pci_free(dev, &dmah); 269 break; 270 case _DRM_GEM: 271 DRM_ERROR("tried to rmmap GEM object\n"); 272 break; 273 } 274 drm_free(map, sizeof(*map), DRM_MEM_MAPS); 275 } 276 } 277 mutex_unlock(&dev->struct_mutex); 278} 279 280/** 281 * \c fault method for DMA virtual memory. 282 * 283 * \param vma virtual memory area. 284 * \param address access address. 285 * \return pointer to the page structure. 286 * 287 * Determine the page number from the page offset and get it from drm_device_dma::pagelist. 288 */ 289static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 290{ 291 struct drm_file *priv = vma->vm_file->private_data; 292 struct drm_device *dev = priv->minor->dev; 293 struct drm_device_dma *dma = dev->dma; 294 unsigned long offset; 295 unsigned long page_nr; 296 struct page *page; 297 298 if (!dma) 299 return VM_FAULT_SIGBUS; /* Error */ 300 if (!dma->pagelist) 301 return VM_FAULT_SIGBUS; /* Nothing allocated */ 302 303 offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ 304 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ 305 page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); 306 307 get_page(page); 308 vmf->page = page; 309 310 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); 311 return 0; 312} 313 314/** 315 * \c fault method for scatter-gather virtual memory. 316 * 317 * \param vma virtual memory area. 318 * \param address access address. 319 * \return pointer to the page structure. 320 * 321 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. 322 */ 323static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 324{ 325 struct drm_local_map *map = vma->vm_private_data; 326 struct drm_file *priv = vma->vm_file->private_data; 327 struct drm_device *dev = priv->minor->dev; 328 struct drm_sg_mem *entry = dev->sg; 329 unsigned long offset; 330 unsigned long map_offset; 331 unsigned long page_offset; 332 struct page *page; 333 334 if (!entry) 335 return VM_FAULT_SIGBUS; /* Error */ 336 if (!entry->pagelist) 337 return VM_FAULT_SIGBUS; /* Nothing allocated */ 338 339 offset = (unsigned long)vmf->virtual_address - vma->vm_start; 340 map_offset = map->offset - (unsigned long)dev->sg->virtual; 341 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); 342 page = entry->pagelist[page_offset]; 343 get_page(page); 344 vmf->page = page; 345 346 return 0; 347} 348 349static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 350{ 351 return drm_do_vm_fault(vma, vmf); 352} 353 354static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 355{ 356 return drm_do_vm_shm_fault(vma, vmf); 357} 358 359static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 360{ 361 return drm_do_vm_dma_fault(vma, vmf); 362} 363 364static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 365{ 366 return drm_do_vm_sg_fault(vma, vmf); 367} 368 369/** AGP virtual memory operations */ 370static struct vm_operations_struct drm_vm_ops = { 371 .fault = drm_vm_fault, 372 .open = drm_vm_open, 373 .close = drm_vm_close, 374}; 375 376/** Shared virtual memory operations */ 377static struct vm_operations_struct drm_vm_shm_ops = { 378 .fault = drm_vm_shm_fault, 379 .open = drm_vm_open, 380 .close = drm_vm_shm_close, 381}; 382 383/** DMA virtual memory operations */ 384static struct vm_operations_struct drm_vm_dma_ops = { 385 .fault = drm_vm_dma_fault, 386 .open = drm_vm_open, 387 .close = drm_vm_close, 388}; 389 390/** Scatter-gather virtual memory operations */ 391static struct vm_operations_struct drm_vm_sg_ops = { 392 .fault = drm_vm_sg_fault, 393 .open = drm_vm_open, 394 .close = drm_vm_close, 395}; 396 397/** 398 * \c open method for shared virtual memory. 399 * 400 * \param vma virtual memory area. 401 * 402 * Create a new drm_vma_entry structure as the \p vma private data entry and 403 * add it to drm_device::vmalist. 404 */ 405void drm_vm_open_locked(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 struct drm_vma_entry *vma_entry; 410 411 DRM_DEBUG("0x%08lx,0x%08lx\n", 412 vma->vm_start, vma->vm_end - vma->vm_start); 413 atomic_inc(&dev->vma_count); 414 415 vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); 416 if (vma_entry) { 417 vma_entry->vma = vma; 418 vma_entry->pid = current->pid; 419 list_add(&vma_entry->head, &dev->vmalist); 420 } 421} 422 423static void drm_vm_open(struct vm_area_struct *vma) 424{ 425 struct drm_file *priv = vma->vm_file->private_data; 426 struct drm_device *dev = priv->minor->dev; 427 428 mutex_lock(&dev->struct_mutex); 429 drm_vm_open_locked(vma); 430 mutex_unlock(&dev->struct_mutex); 431} 432 433/** 434 * \c close method for all virtual memory types. 435 * 436 * \param vma virtual memory area. 437 * 438 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and 439 * free it. 440 */ 441static void drm_vm_close(struct vm_area_struct *vma) 442{ 443 struct drm_file *priv = vma->vm_file->private_data; 444 struct drm_device *dev = priv->minor->dev; 445 struct drm_vma_entry *pt, *temp; 446 447 DRM_DEBUG("0x%08lx,0x%08lx\n", 448 vma->vm_start, vma->vm_end - vma->vm_start); 449 atomic_dec(&dev->vma_count); 450 451 mutex_lock(&dev->struct_mutex); 452 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { 453 if (pt->vma == vma) { 454 list_del(&pt->head); 455 drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); 456 break; 457 } 458 } 459 mutex_unlock(&dev->struct_mutex); 460} 461 462/** 463 * mmap DMA memory. 464 * 465 * \param file_priv DRM file private. 466 * \param vma virtual memory area. 467 * \return zero on success or a negative number on failure. 468 * 469 * Sets the virtual memory area operations structure to vm_dma_ops, the file 470 * pointer, and calls vm_open(). 471 */ 472static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) 473{ 474 struct drm_file *priv = filp->private_data; 475 struct drm_device *dev; 476 struct drm_device_dma *dma; 477 unsigned long length = vma->vm_end - vma->vm_start; 478 479 dev = priv->minor->dev; 480 dma = dev->dma; 481 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", 482 vma->vm_start, vma->vm_end, vma->vm_pgoff); 483 484 /* Length must match exact page count */ 485 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { 486 return -EINVAL; 487 } 488 489 if (!capable(CAP_SYS_ADMIN) && 490 (dma->flags & _DRM_DMA_USE_PCI_RO)) { 491 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); 492#if defined(__i386__) || defined(__x86_64__) 493 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; 494#else 495 /* Ye gads this is ugly. With more thought 496 we could move this up higher and use 497 `protection_map' instead. */ 498 vma->vm_page_prot = 499 __pgprot(pte_val 500 (pte_wrprotect 501 (__pte(pgprot_val(vma->vm_page_prot))))); 502#endif 503 } 504 505 vma->vm_ops = &drm_vm_dma_ops; 506 507 vma->vm_flags |= VM_RESERVED; /* Don't swap */ 508 vma->vm_flags |= VM_DONTEXPAND; 509 510 vma->vm_file = filp; /* Needed for drm_vm_open() */ 511 drm_vm_open_locked(vma); 512 return 0; 513} 514 515unsigned long drm_core_get_map_ofs(struct drm_local_map * map) 516{ 517 return map->offset; 518} 519 520EXPORT_SYMBOL(drm_core_get_map_ofs); 521 522unsigned long drm_core_get_reg_ofs(struct drm_device *dev) 523{ 524#ifdef __alpha__ 525 return dev->hose->dense_mem_base - dev->hose->mem_space->start; 526#else 527 return 0; 528#endif 529} 530 531EXPORT_SYMBOL(drm_core_get_reg_ofs); 532 533/** 534 * mmap DMA memory. 535 * 536 * \param file_priv DRM file private. 537 * \param vma virtual memory area. 538 * \return zero on success or a negative number on failure. 539 * 540 * If the virtual memory area has no offset associated with it then it's a DMA 541 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, 542 * checks that the restricted flag is not set, sets the virtual memory operations 543 * according to the mapping type and remaps the pages. Finally sets the file 544 * pointer and calls vm_open(). 545 */ 546int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) 547{ 548 struct drm_file *priv = filp->private_data; 549 struct drm_device *dev = priv->minor->dev; 550 struct drm_local_map *map = NULL; 551 unsigned long offset = 0; 552 struct drm_hash_item *hash; 553 554 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", 555 vma->vm_start, vma->vm_end, vma->vm_pgoff); 556 557 if (!priv->authenticated) 558 return -EACCES; 559 560 /* We check for "dma". On Apple's UniNorth, it's valid to have 561 * the AGP mapped at physical address 0 562 * --BenH. 563 */ 564 if (!vma->vm_pgoff 565#if __OS_HAS_AGP 566 && (!dev->agp 567 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) 568#endif 569 ) 570 return drm_mmap_dma(filp, vma); 571 572 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { 573 DRM_ERROR("Could not find map\n"); 574 return -EINVAL; 575 } 576 577 map = drm_hash_entry(hash, struct drm_map_list, hash)->map; 578 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) 579 return -EPERM; 580 581 /* Check for valid size. */ 582 if (map->size < vma->vm_end - vma->vm_start) 583 return -EINVAL; 584 585 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { 586 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); 587#if defined(__i386__) || defined(__x86_64__) 588 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; 589#else 590 /* Ye gads this is ugly. With more thought 591 we could move this up higher and use 592 `protection_map' instead. */ 593 vma->vm_page_prot = 594 __pgprot(pte_val 595 (pte_wrprotect 596 (__pte(pgprot_val(vma->vm_page_prot))))); 597#endif 598 } 599 600 switch (map->type) { 601 case _DRM_AGP: 602 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { 603 /* 604 * On some platforms we can't talk to bus dma address from the CPU, so for 605 * memory of type DRM_AGP, we'll deal with sorting out the real physical 606 * pages and mappings in fault() 607 */ 608#if defined(__powerpc__) 609 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; 610#endif 611 vma->vm_ops = &drm_vm_ops; 612 break; 613 } 614 /* fall through to _DRM_FRAME_BUFFER... */ 615 case _DRM_FRAME_BUFFER: 616 case _DRM_REGISTERS: 617 offset = dev->driver->get_reg_ofs(dev); 618 vma->vm_flags |= VM_IO; /* not in core dump */ 619 vma->vm_page_prot = drm_io_prot(map->type, vma); 620 if (io_remap_pfn_range(vma, vma->vm_start, 621 (map->offset + offset) >> PAGE_SHIFT, 622 vma->vm_end - vma->vm_start, 623 vma->vm_page_prot)) 624 return -EAGAIN; 625 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," 626 " offset = 0x%lx\n", 627 map->type, 628 vma->vm_start, vma->vm_end, map->offset + offset); 629 vma->vm_ops = &drm_vm_ops; 630 break; 631 case _DRM_CONSISTENT: 632 /* Consistent memory is really like shared memory. But 633 * it's allocated in a different way, so avoid fault */ 634 if (remap_pfn_range(vma, vma->vm_start, 635 page_to_pfn(virt_to_page(map->handle)), 636 vma->vm_end - vma->vm_start, vma->vm_page_prot)) 637 return -EAGAIN; 638 vma->vm_page_prot = drm_dma_prot(map->type, vma); 639 /* fall through to _DRM_SHM */ 640 case _DRM_SHM: 641 vma->vm_ops = &drm_vm_shm_ops; 642 vma->vm_private_data = (void *)map; 643 /* Don't let this area swap. Change when 644 DRM_KERNEL advisory is supported. */ 645 vma->vm_flags |= VM_RESERVED; 646 break; 647 case _DRM_SCATTER_GATHER: 648 vma->vm_ops = &drm_vm_sg_ops; 649 vma->vm_private_data = (void *)map; 650 vma->vm_flags |= VM_RESERVED; 651 vma->vm_page_prot = drm_dma_prot(map->type, vma); 652 break; 653 default: 654 return -EINVAL; /* This should never happen. */ 655 } 656 vma->vm_flags |= VM_RESERVED; /* Don't swap */ 657 vma->vm_flags |= VM_DONTEXPAND; 658 659 vma->vm_file = filp; /* Needed for drm_vm_open() */ 660 drm_vm_open_locked(vma); 661 return 0; 662} 663 664int drm_mmap(struct file *filp, struct vm_area_struct *vma) 665{ 666 struct drm_file *priv = filp->private_data; 667 struct drm_device *dev = priv->minor->dev; 668 int ret; 669 670 mutex_lock(&dev->struct_mutex); 671 ret = drm_mmap_locked(filp, vma); 672 mutex_unlock(&dev->struct_mutex); 673 674 return ret; 675} 676EXPORT_SYMBOL(drm_mmap); 677