drm_vm.c revision 161c48100236916e98d33a9c8b5fc8eae6decd15
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#include <linux/slab.h> 40#endif 41 42static void drm_vm_open(struct vm_area_struct *vma); 43static void drm_vm_close(struct vm_area_struct *vma); 44 45static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma) 46{ 47 pgprot_t tmp = vm_get_page_prot(vma->vm_flags); 48 49#if defined(__i386__) || defined(__x86_64__) 50 if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) { 51 pgprot_val(tmp) |= _PAGE_PCD; 52 pgprot_val(tmp) &= ~_PAGE_PWT; 53 } 54#elif defined(__powerpc__) 55 pgprot_val(tmp) |= _PAGE_NO_CACHE; 56 if (map_type == _DRM_REGISTERS) 57 pgprot_val(tmp) |= _PAGE_GUARDED; 58#elif defined(__ia64__) 59 if (efi_range_is_wc(vma->vm_start, vma->vm_end - 60 vma->vm_start)) 61 tmp = pgprot_writecombine(tmp); 62 else 63 tmp = pgprot_noncached(tmp); 64#elif defined(__sparc__) || defined(__arm__) 65 tmp = pgprot_noncached(tmp); 66#endif 67 return tmp; 68} 69 70static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) 71{ 72 pgprot_t tmp = vm_get_page_prot(vma->vm_flags); 73 74#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) 75 tmp |= _PAGE_NO_CACHE; 76#endif 77 return tmp; 78} 79 80/** 81 * \c fault method for AGP virtual memory. 82 * 83 * \param vma virtual memory area. 84 * \param address access address. 85 * \return pointer to the page structure. 86 * 87 * Find the right map and if it's AGP memory find the real physical page to 88 * map, get the page, increment the use count and return it. 89 */ 90#if __OS_HAS_AGP 91static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 92{ 93 struct drm_file *priv = vma->vm_file->private_data; 94 struct drm_device *dev = priv->minor->dev; 95 struct drm_local_map *map = NULL; 96 struct drm_map_list *r_list; 97 struct drm_hash_item *hash; 98 99 /* 100 * Find the right map 101 */ 102 if (!drm_core_has_AGP(dev)) 103 goto vm_fault_error; 104 105 if (!dev->agp || !dev->agp->cant_use_aperture) 106 goto vm_fault_error; 107 108 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) 109 goto vm_fault_error; 110 111 r_list = drm_hash_entry(hash, struct drm_map_list, hash); 112 map = r_list->map; 113 114 if (map && map->type == _DRM_AGP) { 115 /* 116 * Using vm_pgoff as a selector forces us to use this unusual 117 * addressing scheme. 118 */ 119 resource_size_t offset = (unsigned long)vmf->virtual_address - 120 vma->vm_start; 121 resource_size_t baddr = map->offset + offset; 122 struct drm_agp_mem *agpmem; 123 struct page *page; 124 125#ifdef __alpha__ 126 /* 127 * Adjust to a bus-relative address 128 */ 129 baddr -= dev->hose->mem_space->start; 130#endif 131 132 /* 133 * It's AGP memory - find the real physical page to map 134 */ 135 list_for_each_entry(agpmem, &dev->agp->memory, head) { 136 if (agpmem->bound <= baddr && 137 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) 138 break; 139 } 140 141 if (&agpmem->head == &dev->agp->memory) 142 goto vm_fault_error; 143 144 /* 145 * Get the page, inc the use count, and return it 146 */ 147 offset = (baddr - agpmem->bound) >> PAGE_SHIFT; 148 page = agpmem->memory->pages[offset]; 149 get_page(page); 150 vmf->page = page; 151 152 DRM_DEBUG 153 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n", 154 (unsigned long long)baddr, 155 agpmem->memory->pages[offset], 156 (unsigned long long)offset, 157 page_count(page)); 158 return 0; 159 } 160vm_fault_error: 161 return VM_FAULT_SIGBUS; /* Disallow mremap */ 162} 163#else /* __OS_HAS_AGP */ 164static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 165{ 166 return VM_FAULT_SIGBUS; 167} 168#endif /* __OS_HAS_AGP */ 169 170/** 171 * \c nopage method for shared virtual memory. 172 * 173 * \param vma virtual memory area. 174 * \param address access address. 175 * \return pointer to the page structure. 176 * 177 * Get the mapping, find the real physical page to map, get the page, and 178 * return it. 179 */ 180static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 181{ 182 struct drm_local_map *map = vma->vm_private_data; 183 unsigned long offset; 184 unsigned long i; 185 struct page *page; 186 187 if (!map) 188 return VM_FAULT_SIGBUS; /* Nothing allocated */ 189 190 offset = (unsigned long)vmf->virtual_address - vma->vm_start; 191 i = (unsigned long)map->handle + offset; 192 page = vmalloc_to_page((void *)i); 193 if (!page) 194 return VM_FAULT_SIGBUS; 195 get_page(page); 196 vmf->page = page; 197 198 DRM_DEBUG("shm_fault 0x%lx\n", offset); 199 return 0; 200} 201 202/** 203 * \c close method for shared virtual memory. 204 * 205 * \param vma virtual memory area. 206 * 207 * Deletes map information if we are the last 208 * person to close a mapping and it's not in the global maplist. 209 */ 210static void drm_vm_shm_close(struct vm_area_struct *vma) 211{ 212 struct drm_file *priv = vma->vm_file->private_data; 213 struct drm_device *dev = priv->minor->dev; 214 struct drm_vma_entry *pt, *temp; 215 struct drm_local_map *map; 216 struct drm_map_list *r_list; 217 int found_maps = 0; 218 219 DRM_DEBUG("0x%08lx,0x%08lx\n", 220 vma->vm_start, vma->vm_end - vma->vm_start); 221 atomic_dec(&dev->vma_count); 222 223 map = vma->vm_private_data; 224 225 mutex_lock(&dev->struct_mutex); 226 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { 227 if (pt->vma->vm_private_data == map) 228 found_maps++; 229 if (pt->vma == vma) { 230 list_del(&pt->head); 231 kfree(pt); 232 } 233 } 234 235 /* We were the only map that was found */ 236 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { 237 /* Check to see if we are in the maplist, if we are not, then 238 * we delete this mappings information. 239 */ 240 found_maps = 0; 241 list_for_each_entry(r_list, &dev->maplist, head) { 242 if (r_list->map == map) 243 found_maps++; 244 } 245 246 if (!found_maps) { 247 drm_dma_handle_t dmah; 248 249 switch (map->type) { 250 case _DRM_REGISTERS: 251 case _DRM_FRAME_BUFFER: 252 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { 253 int retcode; 254 retcode = mtrr_del(map->mtrr, 255 map->offset, 256 map->size); 257 DRM_DEBUG("mtrr_del = %d\n", retcode); 258 } 259 iounmap(map->handle); 260 break; 261 case _DRM_SHM: 262 vfree(map->handle); 263 break; 264 case _DRM_AGP: 265 case _DRM_SCATTER_GATHER: 266 break; 267 case _DRM_CONSISTENT: 268 dmah.vaddr = map->handle; 269 dmah.busaddr = map->offset; 270 dmah.size = map->size; 271 __drm_pci_free(dev, &dmah); 272 break; 273 case _DRM_GEM: 274 DRM_ERROR("tried to rmmap GEM object\n"); 275 break; 276 } 277 kfree(map); 278 } 279 } 280 mutex_unlock(&dev->struct_mutex); 281} 282 283/** 284 * \c fault method for DMA virtual memory. 285 * 286 * \param vma virtual memory area. 287 * \param address access address. 288 * \return pointer to the page structure. 289 * 290 * Determine the page number from the page offset and get it from drm_device_dma::pagelist. 291 */ 292static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 293{ 294 struct drm_file *priv = vma->vm_file->private_data; 295 struct drm_device *dev = priv->minor->dev; 296 struct drm_device_dma *dma = dev->dma; 297 unsigned long offset; 298 unsigned long page_nr; 299 struct page *page; 300 301 if (!dma) 302 return VM_FAULT_SIGBUS; /* Error */ 303 if (!dma->pagelist) 304 return VM_FAULT_SIGBUS; /* Nothing allocated */ 305 306 offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* 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((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); 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 vma virtual memory area. 321 * \param address access address. 322 * \return pointer to the page structure. 323 * 324 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. 325 */ 326static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 327{ 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 = (unsigned long)vmf->virtual_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 352static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 353{ 354 return drm_do_vm_fault(vma, vmf); 355} 356 357static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 358{ 359 return drm_do_vm_shm_fault(vma, vmf); 360} 361 362static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 363{ 364 return drm_do_vm_dma_fault(vma, vmf); 365} 366 367static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 368{ 369 return drm_do_vm_sg_fault(vma, vmf); 370} 371 372/** AGP virtual memory operations */ 373static const struct vm_operations_struct drm_vm_ops = { 374 .fault = drm_vm_fault, 375 .open = drm_vm_open, 376 .close = drm_vm_close, 377}; 378 379/** Shared virtual memory operations */ 380static const struct vm_operations_struct drm_vm_shm_ops = { 381 .fault = drm_vm_shm_fault, 382 .open = drm_vm_open, 383 .close = drm_vm_shm_close, 384}; 385 386/** DMA virtual memory operations */ 387static const struct vm_operations_struct drm_vm_dma_ops = { 388 .fault = drm_vm_dma_fault, 389 .open = drm_vm_open, 390 .close = drm_vm_close, 391}; 392 393/** Scatter-gather virtual memory operations */ 394static const struct vm_operations_struct drm_vm_sg_ops = { 395 .fault = drm_vm_sg_fault, 396 .open = drm_vm_open, 397 .close = drm_vm_close, 398}; 399 400/** 401 * \c open method for shared virtual memory. 402 * 403 * \param vma virtual memory area. 404 * 405 * Create a new drm_vma_entry structure as the \p vma private data entry and 406 * add it to drm_device::vmalist. 407 */ 408void drm_vm_open_locked(struct vm_area_struct *vma) 409{ 410 struct drm_file *priv = vma->vm_file->private_data; 411 struct drm_device *dev = priv->minor->dev; 412 struct drm_vma_entry *vma_entry; 413 414 DRM_DEBUG("0x%08lx,0x%08lx\n", 415 vma->vm_start, vma->vm_end - vma->vm_start); 416 atomic_inc(&dev->vma_count); 417 418 vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL); 419 if (vma_entry) { 420 vma_entry->vma = vma; 421 vma_entry->pid = current->pid; 422 list_add(&vma_entry->head, &dev->vmalist); 423 } 424} 425 426static void drm_vm_open(struct vm_area_struct *vma) 427{ 428 struct drm_file *priv = vma->vm_file->private_data; 429 struct drm_device *dev = priv->minor->dev; 430 431 mutex_lock(&dev->struct_mutex); 432 drm_vm_open_locked(vma); 433 mutex_unlock(&dev->struct_mutex); 434} 435 436/** 437 * \c close method for all virtual memory types. 438 * 439 * \param vma virtual memory area. 440 * 441 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and 442 * free it. 443 */ 444static void drm_vm_close(struct vm_area_struct *vma) 445{ 446 struct drm_file *priv = vma->vm_file->private_data; 447 struct drm_device *dev = priv->minor->dev; 448 struct drm_vma_entry *pt, *temp; 449 450 DRM_DEBUG("0x%08lx,0x%08lx\n", 451 vma->vm_start, vma->vm_end - vma->vm_start); 452 atomic_dec(&dev->vma_count); 453 454 mutex_lock(&dev->struct_mutex); 455 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { 456 if (pt->vma == vma) { 457 list_del(&pt->head); 458 kfree(pt); 459 break; 460 } 461 } 462 mutex_unlock(&dev->struct_mutex); 463} 464 465/** 466 * mmap DMA memory. 467 * 468 * \param file_priv DRM file private. 469 * \param vma virtual memory area. 470 * \return zero on success or a negative number on failure. 471 * 472 * Sets the virtual memory area operations structure to vm_dma_ops, the file 473 * pointer, and calls vm_open(). 474 */ 475static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) 476{ 477 struct drm_file *priv = filp->private_data; 478 struct drm_device *dev; 479 struct drm_device_dma *dma; 480 unsigned long length = vma->vm_end - vma->vm_start; 481 482 dev = priv->minor->dev; 483 dma = dev->dma; 484 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", 485 vma->vm_start, vma->vm_end, vma->vm_pgoff); 486 487 /* Length must match exact page count */ 488 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { 489 return -EINVAL; 490 } 491 492 if (!capable(CAP_SYS_ADMIN) && 493 (dma->flags & _DRM_DMA_USE_PCI_RO)) { 494 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); 495#if defined(__i386__) || defined(__x86_64__) 496 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; 497#else 498 /* Ye gads this is ugly. With more thought 499 we could move this up higher and use 500 `protection_map' instead. */ 501 vma->vm_page_prot = 502 __pgprot(pte_val 503 (pte_wrprotect 504 (__pte(pgprot_val(vma->vm_page_prot))))); 505#endif 506 } 507 508 vma->vm_ops = &drm_vm_dma_ops; 509 510 vma->vm_flags |= VM_RESERVED; /* Don't swap */ 511 vma->vm_flags |= VM_DONTEXPAND; 512 513 vma->vm_file = filp; /* Needed for drm_vm_open() */ 514 drm_vm_open_locked(vma); 515 return 0; 516} 517 518resource_size_t drm_core_get_map_ofs(struct drm_local_map * map) 519{ 520 return map->offset; 521} 522 523EXPORT_SYMBOL(drm_core_get_map_ofs); 524 525resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) 526{ 527#ifdef __alpha__ 528 return dev->hose->dense_mem_base - dev->hose->mem_space->start; 529#else 530 return 0; 531#endif 532} 533 534EXPORT_SYMBOL(drm_core_get_reg_ofs); 535 536/** 537 * mmap DMA memory. 538 * 539 * \param file_priv DRM file private. 540 * \param vma virtual memory area. 541 * \return zero on success or a negative number on failure. 542 * 543 * If the virtual memory area has no offset associated with it then it's a DMA 544 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, 545 * checks that the restricted flag is not set, sets the virtual memory operations 546 * according to the mapping type and remaps the pages. Finally sets the file 547 * pointer and calls vm_open(). 548 */ 549int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) 550{ 551 struct drm_file *priv = filp->private_data; 552 struct drm_device *dev = priv->minor->dev; 553 struct drm_local_map *map = NULL; 554 resource_size_t offset = 0; 555 struct drm_hash_item *hash; 556 557 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", 558 vma->vm_start, vma->vm_end, vma->vm_pgoff); 559 560 if (!priv->authenticated) 561 return -EACCES; 562 563 /* We check for "dma". On Apple's UniNorth, it's valid to have 564 * the AGP mapped at physical address 0 565 * --BenH. 566 */ 567 if (!vma->vm_pgoff 568#if __OS_HAS_AGP 569 && (!dev->agp 570 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) 571#endif 572 ) 573 return drm_mmap_dma(filp, vma); 574 575 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { 576 DRM_ERROR("Could not find map\n"); 577 return -EINVAL; 578 } 579 580 map = drm_hash_entry(hash, struct drm_map_list, hash)->map; 581 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) 582 return -EPERM; 583 584 /* Check for valid size. */ 585 if (map->size < vma->vm_end - vma->vm_start) 586 return -EINVAL; 587 588 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { 589 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); 590#if defined(__i386__) || defined(__x86_64__) 591 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; 592#else 593 /* Ye gads this is ugly. With more thought 594 we could move this up higher and use 595 `protection_map' instead. */ 596 vma->vm_page_prot = 597 __pgprot(pte_val 598 (pte_wrprotect 599 (__pte(pgprot_val(vma->vm_page_prot))))); 600#endif 601 } 602 603 switch (map->type) { 604#if !defined(__arm__) 605 case _DRM_AGP: 606 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { 607 /* 608 * On some platforms we can't talk to bus dma address from the CPU, so for 609 * memory of type DRM_AGP, we'll deal with sorting out the real physical 610 * pages and mappings in fault() 611 */ 612#if defined(__powerpc__) 613 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; 614#endif 615 vma->vm_ops = &drm_vm_ops; 616 break; 617 } 618 /* fall through to _DRM_FRAME_BUFFER... */ 619#endif 620 case _DRM_FRAME_BUFFER: 621 case _DRM_REGISTERS: 622 offset = dev->driver->get_reg_ofs(dev); 623 vma->vm_flags |= VM_IO; /* not in core dump */ 624 vma->vm_page_prot = drm_io_prot(map->type, vma); 625#if !defined(__arm__) 626 if (io_remap_pfn_range(vma, vma->vm_start, 627 (map->offset + offset) >> PAGE_SHIFT, 628 vma->vm_end - vma->vm_start, 629 vma->vm_page_prot)) 630 return -EAGAIN; 631#else 632 if (remap_pfn_range(vma, vma->vm_start, 633 (map->offset + offset) >> PAGE_SHIFT, 634 vma->vm_end - vma->vm_start, 635 vma->vm_page_prot)) 636 return -EAGAIN; 637#endif 638 639 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," 640 " offset = 0x%llx\n", 641 map->type, 642 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset)); 643 644 vma->vm_ops = &drm_vm_ops; 645 break; 646 case _DRM_CONSISTENT: 647 /* Consistent memory is really like shared memory. But 648 * it's allocated in a different way, so avoid fault */ 649 if (remap_pfn_range(vma, vma->vm_start, 650 page_to_pfn(virt_to_page(map->handle)), 651 vma->vm_end - vma->vm_start, vma->vm_page_prot)) 652 return -EAGAIN; 653 vma->vm_page_prot = drm_dma_prot(map->type, vma); 654 /* fall through to _DRM_SHM */ 655 case _DRM_SHM: 656 vma->vm_ops = &drm_vm_shm_ops; 657 vma->vm_private_data = (void *)map; 658 /* Don't let this area swap. Change when 659 DRM_KERNEL advisory is supported. */ 660 vma->vm_flags |= VM_RESERVED; 661 break; 662 case _DRM_SCATTER_GATHER: 663 vma->vm_ops = &drm_vm_sg_ops; 664 vma->vm_private_data = (void *)map; 665 vma->vm_flags |= VM_RESERVED; 666 vma->vm_page_prot = drm_dma_prot(map->type, vma); 667 break; 668 default: 669 return -EINVAL; /* This should never happen. */ 670 } 671 vma->vm_flags |= VM_RESERVED; /* Don't swap */ 672 vma->vm_flags |= VM_DONTEXPAND; 673 674 vma->vm_file = filp; /* Needed for drm_vm_open() */ 675 drm_vm_open_locked(vma); 676 return 0; 677} 678 679int drm_mmap(struct file *filp, struct vm_area_struct *vma) 680{ 681 struct drm_file *priv = filp->private_data; 682 struct drm_device *dev = priv->minor->dev; 683 int ret; 684 685 mutex_lock(&dev->struct_mutex); 686 ret = drm_mmap_locked(filp, vma); 687 mutex_unlock(&dev->struct_mutex); 688 689 return ret; 690} 691EXPORT_SYMBOL(drm_mmap); 692