drm_vm.c revision edf0ac7c67ce596f43d66a781660889bbdcc9505
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_legacy.h" 45 46struct drm_vma_entry { 47 struct list_head head; 48 struct vm_area_struct *vma; 49 pid_t pid; 50}; 51 52static void drm_vm_open(struct vm_area_struct *vma); 53static void drm_vm_close(struct vm_area_struct *vma); 54 55static pgprot_t drm_io_prot(struct drm_local_map *map, 56 struct vm_area_struct *vma) 57{ 58 pgprot_t tmp = vm_get_page_prot(vma->vm_flags); 59 60#if defined(__i386__) || defined(__x86_64__) 61 if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING)) 62 tmp = pgprot_noncached(tmp); 63 else 64 tmp = pgprot_writecombine(tmp); 65#elif defined(__powerpc__) 66 pgprot_val(tmp) |= _PAGE_NO_CACHE; 67 if (map->type == _DRM_REGISTERS) 68 pgprot_val(tmp) |= _PAGE_GUARDED; 69#elif defined(__ia64__) 70 if (efi_range_is_wc(vma->vm_start, vma->vm_end - 71 vma->vm_start)) 72 tmp = pgprot_writecombine(tmp); 73 else 74 tmp = pgprot_noncached(tmp); 75#elif defined(__sparc__) || defined(__arm__) || defined(__mips__) 76 tmp = pgprot_noncached(tmp); 77#endif 78 return tmp; 79} 80 81static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) 82{ 83 pgprot_t tmp = vm_get_page_prot(vma->vm_flags); 84 85#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) 86 tmp |= _PAGE_NO_CACHE; 87#endif 88 return tmp; 89} 90 91/** 92 * \c fault method for AGP virtual memory. 93 * 94 * \param vma virtual memory area. 95 * \param address access address. 96 * \return pointer to the page structure. 97 * 98 * Find the right map and if it's AGP memory find the real physical page to 99 * map, get the page, increment the use count and return it. 100 */ 101#if __OS_HAS_AGP 102static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 103{ 104 struct drm_file *priv = vma->vm_file->private_data; 105 struct drm_device *dev = priv->minor->dev; 106 struct drm_local_map *map = NULL; 107 struct drm_map_list *r_list; 108 struct drm_hash_item *hash; 109 110 /* 111 * Find the right map 112 */ 113 if (!dev->agp) 114 goto vm_fault_error; 115 116 if (!dev->agp || !dev->agp->cant_use_aperture) 117 goto vm_fault_error; 118 119 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) 120 goto vm_fault_error; 121 122 r_list = drm_hash_entry(hash, struct drm_map_list, hash); 123 map = r_list->map; 124 125 if (map && map->type == _DRM_AGP) { 126 /* 127 * Using vm_pgoff as a selector forces us to use this unusual 128 * addressing scheme. 129 */ 130 resource_size_t offset = (unsigned long)vmf->virtual_address - 131 vma->vm_start; 132 resource_size_t baddr = map->offset + offset; 133 struct drm_agp_mem *agpmem; 134 struct page *page; 135 136#ifdef __alpha__ 137 /* 138 * Adjust to a bus-relative address 139 */ 140 baddr -= dev->hose->mem_space->start; 141#endif 142 143 /* 144 * It's AGP memory - find the real physical page to map 145 */ 146 list_for_each_entry(agpmem, &dev->agp->memory, head) { 147 if (agpmem->bound <= baddr && 148 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) 149 break; 150 } 151 152 if (&agpmem->head == &dev->agp->memory) 153 goto vm_fault_error; 154 155 /* 156 * Get the page, inc the use count, and return it 157 */ 158 offset = (baddr - agpmem->bound) >> PAGE_SHIFT; 159 page = agpmem->memory->pages[offset]; 160 get_page(page); 161 vmf->page = page; 162 163 DRM_DEBUG 164 ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n", 165 (unsigned long long)baddr, 166 agpmem->memory->pages[offset], 167 (unsigned long long)offset, 168 page_count(page)); 169 return 0; 170 } 171vm_fault_error: 172 return VM_FAULT_SIGBUS; /* Disallow mremap */ 173} 174#else /* __OS_HAS_AGP */ 175static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 176{ 177 return VM_FAULT_SIGBUS; 178} 179#endif /* __OS_HAS_AGP */ 180 181/** 182 * \c nopage method for shared virtual memory. 183 * 184 * \param vma virtual memory area. 185 * \param address access address. 186 * \return pointer to the page structure. 187 * 188 * Get the mapping, find the real physical page to map, get the page, and 189 * return it. 190 */ 191static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 192{ 193 struct drm_local_map *map = vma->vm_private_data; 194 unsigned long offset; 195 unsigned long i; 196 struct page *page; 197 198 if (!map) 199 return VM_FAULT_SIGBUS; /* Nothing allocated */ 200 201 offset = (unsigned long)vmf->virtual_address - vma->vm_start; 202 i = (unsigned long)map->handle + offset; 203 page = vmalloc_to_page((void *)i); 204 if (!page) 205 return VM_FAULT_SIGBUS; 206 get_page(page); 207 vmf->page = page; 208 209 DRM_DEBUG("shm_fault 0x%lx\n", offset); 210 return 0; 211} 212 213/** 214 * \c close method for shared virtual memory. 215 * 216 * \param vma virtual memory area. 217 * 218 * Deletes map information if we are the last 219 * person to close a mapping and it's not in the global maplist. 220 */ 221static void drm_vm_shm_close(struct vm_area_struct *vma) 222{ 223 struct drm_file *priv = vma->vm_file->private_data; 224 struct drm_device *dev = priv->minor->dev; 225 struct drm_vma_entry *pt, *temp; 226 struct drm_local_map *map; 227 struct drm_map_list *r_list; 228 int found_maps = 0; 229 230 DRM_DEBUG("0x%08lx,0x%08lx\n", 231 vma->vm_start, vma->vm_end - vma->vm_start); 232 233 map = vma->vm_private_data; 234 235 mutex_lock(&dev->struct_mutex); 236 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { 237 if (pt->vma->vm_private_data == map) 238 found_maps++; 239 if (pt->vma == vma) { 240 list_del(&pt->head); 241 kfree(pt); 242 } 243 } 244 245 /* We were the only map that was found */ 246 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { 247 /* Check to see if we are in the maplist, if we are not, then 248 * we delete this mappings information. 249 */ 250 found_maps = 0; 251 list_for_each_entry(r_list, &dev->maplist, head) { 252 if (r_list->map == map) 253 found_maps++; 254 } 255 256 if (!found_maps) { 257 drm_dma_handle_t dmah; 258 259 switch (map->type) { 260 case _DRM_REGISTERS: 261 case _DRM_FRAME_BUFFER: 262 arch_phys_wc_del(map->mtrr); 263 iounmap(map->handle); 264 break; 265 case _DRM_SHM: 266 vfree(map->handle); 267 break; 268 case _DRM_AGP: 269 case _DRM_SCATTER_GATHER: 270 break; 271 case _DRM_CONSISTENT: 272 dmah.vaddr = map->handle; 273 dmah.busaddr = map->offset; 274 dmah.size = map->size; 275 __drm_pci_free(dev, &dmah); 276 break; 277 } 278 kfree(map); 279 } 280 } 281 mutex_unlock(&dev->struct_mutex); 282} 283 284/** 285 * \c fault method for DMA virtual memory. 286 * 287 * \param vma virtual memory area. 288 * \param address access address. 289 * \return pointer to the page structure. 290 * 291 * Determine the page number from the page offset and get it from drm_device_dma::pagelist. 292 */ 293static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 294{ 295 struct drm_file *priv = vma->vm_file->private_data; 296 struct drm_device *dev = priv->minor->dev; 297 struct drm_device_dma *dma = dev->dma; 298 unsigned long offset; 299 unsigned long page_nr; 300 struct page *page; 301 302 if (!dma) 303 return VM_FAULT_SIGBUS; /* Error */ 304 if (!dma->pagelist) 305 return VM_FAULT_SIGBUS; /* Nothing allocated */ 306 307 offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ 308 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ 309 page = virt_to_page((void *)dma->pagelist[page_nr]); 310 311 get_page(page); 312 vmf->page = page; 313 314 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); 315 return 0; 316} 317 318/** 319 * \c fault method for scatter-gather virtual memory. 320 * 321 * \param vma virtual memory area. 322 * \param address access address. 323 * \return pointer to the page structure. 324 * 325 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. 326 */ 327static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 328{ 329 struct drm_local_map *map = vma->vm_private_data; 330 struct drm_file *priv = vma->vm_file->private_data; 331 struct drm_device *dev = priv->minor->dev; 332 struct drm_sg_mem *entry = dev->sg; 333 unsigned long offset; 334 unsigned long map_offset; 335 unsigned long page_offset; 336 struct page *page; 337 338 if (!entry) 339 return VM_FAULT_SIGBUS; /* Error */ 340 if (!entry->pagelist) 341 return VM_FAULT_SIGBUS; /* Nothing allocated */ 342 343 offset = (unsigned long)vmf->virtual_address - vma->vm_start; 344 map_offset = map->offset - (unsigned long)dev->sg->virtual; 345 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); 346 page = entry->pagelist[page_offset]; 347 get_page(page); 348 vmf->page = page; 349 350 return 0; 351} 352 353static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 354{ 355 return drm_do_vm_fault(vma, vmf); 356} 357 358static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 359{ 360 return drm_do_vm_shm_fault(vma, vmf); 361} 362 363static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 364{ 365 return drm_do_vm_dma_fault(vma, vmf); 366} 367 368static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 369{ 370 return drm_do_vm_sg_fault(vma, vmf); 371} 372 373/** AGP virtual memory operations */ 374static const struct vm_operations_struct drm_vm_ops = { 375 .fault = drm_vm_fault, 376 .open = drm_vm_open, 377 .close = drm_vm_close, 378}; 379 380/** Shared virtual memory operations */ 381static const struct vm_operations_struct drm_vm_shm_ops = { 382 .fault = drm_vm_shm_fault, 383 .open = drm_vm_open, 384 .close = drm_vm_shm_close, 385}; 386 387/** DMA virtual memory operations */ 388static const struct vm_operations_struct drm_vm_dma_ops = { 389 .fault = drm_vm_dma_fault, 390 .open = drm_vm_open, 391 .close = drm_vm_close, 392}; 393 394/** Scatter-gather virtual memory operations */ 395static const struct vm_operations_struct drm_vm_sg_ops = { 396 .fault = drm_vm_sg_fault, 397 .open = drm_vm_open, 398 .close = drm_vm_close, 399}; 400 401/** 402 * \c open method for shared virtual memory. 403 * 404 * \param vma virtual memory area. 405 * 406 * Create a new drm_vma_entry structure as the \p vma private data entry and 407 * add it to drm_device::vmalist. 408 */ 409void drm_vm_open_locked(struct drm_device *dev, 410 struct vm_area_struct *vma) 411{ 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); 416 417 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} 424EXPORT_SYMBOL_GPL(drm_vm_open_locked); 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(dev, vma); 433 mutex_unlock(&dev->struct_mutex); 434} 435 436void drm_vm_close_locked(struct drm_device *dev, 437 struct vm_area_struct *vma) 438{ 439 struct drm_vma_entry *pt, *temp; 440 441 DRM_DEBUG("0x%08lx,0x%08lx\n", 442 vma->vm_start, vma->vm_end - vma->vm_start); 443 444 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { 445 if (pt->vma == vma) { 446 list_del(&pt->head); 447 kfree(pt); 448 break; 449 } 450 } 451} 452 453/** 454 * \c close method for all virtual memory types. 455 * 456 * \param vma virtual memory area. 457 * 458 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and 459 * free it. 460 */ 461static void drm_vm_close(struct vm_area_struct *vma) 462{ 463 struct drm_file *priv = vma->vm_file->private_data; 464 struct drm_device *dev = priv->minor->dev; 465 466 mutex_lock(&dev->struct_mutex); 467 drm_vm_close_locked(dev, vma); 468 mutex_unlock(&dev->struct_mutex); 469} 470 471/** 472 * mmap DMA memory. 473 * 474 * \param file_priv DRM file private. 475 * \param vma virtual memory area. 476 * \return zero on success or a negative number on failure. 477 * 478 * Sets the virtual memory area operations structure to vm_dma_ops, the file 479 * pointer, and calls vm_open(). 480 */ 481static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) 482{ 483 struct drm_file *priv = filp->private_data; 484 struct drm_device *dev; 485 struct drm_device_dma *dma; 486 unsigned long length = vma->vm_end - vma->vm_start; 487 488 dev = priv->minor->dev; 489 dma = dev->dma; 490 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", 491 vma->vm_start, vma->vm_end, vma->vm_pgoff); 492 493 /* Length must match exact page count */ 494 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { 495 return -EINVAL; 496 } 497 498 if (!capable(CAP_SYS_ADMIN) && 499 (dma->flags & _DRM_DMA_USE_PCI_RO)) { 500 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); 501#if defined(__i386__) || defined(__x86_64__) 502 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; 503#else 504 /* Ye gads this is ugly. With more thought 505 we could move this up higher and use 506 `protection_map' instead. */ 507 vma->vm_page_prot = 508 __pgprot(pte_val 509 (pte_wrprotect 510 (__pte(pgprot_val(vma->vm_page_prot))))); 511#endif 512 } 513 514 vma->vm_ops = &drm_vm_dma_ops; 515 516 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 517 518 drm_vm_open_locked(dev, vma); 519 return 0; 520} 521 522static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) 523{ 524#ifdef __alpha__ 525 return dev->hose->dense_mem_base; 526#else 527 return 0; 528#endif 529} 530 531/** 532 * mmap DMA memory. 533 * 534 * \param file_priv DRM file private. 535 * \param vma virtual memory area. 536 * \return zero on success or a negative number on failure. 537 * 538 * If the virtual memory area has no offset associated with it then it's a DMA 539 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, 540 * checks that the restricted flag is not set, sets the virtual memory operations 541 * according to the mapping type and remaps the pages. Finally sets the file 542 * pointer and calls vm_open(). 543 */ 544int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) 545{ 546 struct drm_file *priv = filp->private_data; 547 struct drm_device *dev = priv->minor->dev; 548 struct drm_local_map *map = NULL; 549 resource_size_t offset = 0; 550 struct drm_hash_item *hash; 551 552 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", 553 vma->vm_start, vma->vm_end, vma->vm_pgoff); 554 555 if (!priv->authenticated) 556 return -EACCES; 557 558 /* We check for "dma". On Apple's UniNorth, it's valid to have 559 * the AGP mapped at physical address 0 560 * --BenH. 561 */ 562 if (!vma->vm_pgoff 563#if __OS_HAS_AGP 564 && (!dev->agp 565 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) 566#endif 567 ) 568 return drm_mmap_dma(filp, vma); 569 570 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { 571 DRM_ERROR("Could not find map\n"); 572 return -EINVAL; 573 } 574 575 map = drm_hash_entry(hash, struct drm_map_list, hash)->map; 576 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) 577 return -EPERM; 578 579 /* Check for valid size. */ 580 if (map->size < vma->vm_end - vma->vm_start) 581 return -EINVAL; 582 583 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { 584 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); 585#if defined(__i386__) || defined(__x86_64__) 586 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; 587#else 588 /* Ye gads this is ugly. With more thought 589 we could move this up higher and use 590 `protection_map' instead. */ 591 vma->vm_page_prot = 592 __pgprot(pte_val 593 (pte_wrprotect 594 (__pte(pgprot_val(vma->vm_page_prot))))); 595#endif 596 } 597 598 switch (map->type) { 599#if !defined(__arm__) 600 case _DRM_AGP: 601 if (dev->agp && dev->agp->cant_use_aperture) { 602 /* 603 * On some platforms we can't talk to bus dma address from the CPU, so for 604 * memory of type DRM_AGP, we'll deal with sorting out the real physical 605 * pages and mappings in fault() 606 */ 607#if defined(__powerpc__) 608 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; 609#endif 610 vma->vm_ops = &drm_vm_ops; 611 break; 612 } 613 /* fall through to _DRM_FRAME_BUFFER... */ 614#endif 615 case _DRM_FRAME_BUFFER: 616 case _DRM_REGISTERS: 617 offset = drm_core_get_reg_ofs(dev); 618 vma->vm_page_prot = drm_io_prot(map, vma); 619 if (io_remap_pfn_range(vma, vma->vm_start, 620 (map->offset + offset) >> PAGE_SHIFT, 621 vma->vm_end - vma->vm_start, 622 vma->vm_page_prot)) 623 return -EAGAIN; 624 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," 625 " offset = 0x%llx\n", 626 map->type, 627 vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset)); 628 629 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 break; 644 case _DRM_SCATTER_GATHER: 645 vma->vm_ops = &drm_vm_sg_ops; 646 vma->vm_private_data = (void *)map; 647 vma->vm_page_prot = drm_dma_prot(map->type, vma); 648 break; 649 default: 650 return -EINVAL; /* This should never happen. */ 651 } 652 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 653 654 drm_vm_open_locked(dev, vma); 655 return 0; 656} 657 658int drm_mmap(struct file *filp, struct vm_area_struct *vma) 659{ 660 struct drm_file *priv = filp->private_data; 661 struct drm_device *dev = priv->minor->dev; 662 int ret; 663 664 if (drm_device_is_unplugged(dev)) 665 return -ENODEV; 666 667 mutex_lock(&dev->struct_mutex); 668 ret = drm_mmap_locked(filp, vma); 669 mutex_unlock(&dev->struct_mutex); 670 671 return ret; 672} 673EXPORT_SYMBOL(drm_mmap); 674 675void drm_legacy_vma_flush(struct drm_device *dev) 676{ 677 struct drm_vma_entry *vma, *vma_temp; 678 679 /* Clear vma list (only needed for legacy drivers) */ 680 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 681 list_del(&vma->head); 682 kfree(vma); 683 } 684} 685 686int drm_vma_info(struct seq_file *m, void *data) 687{ 688 struct drm_info_node *node = (struct drm_info_node *) m->private; 689 struct drm_device *dev = node->minor->dev; 690 struct drm_vma_entry *pt; 691 struct vm_area_struct *vma; 692 unsigned long vma_count = 0; 693#if defined(__i386__) 694 unsigned int pgprot; 695#endif 696 697 mutex_lock(&dev->struct_mutex); 698 list_for_each_entry(pt, &dev->vmalist, head) 699 vma_count++; 700 701 seq_printf(m, "vma use count: %lu, high_memory = %pK, 0x%pK\n", 702 vma_count, high_memory, 703 (void *)(unsigned long)virt_to_phys(high_memory)); 704 705 list_for_each_entry(pt, &dev->vmalist, head) { 706 vma = pt->vma; 707 if (!vma) 708 continue; 709 seq_printf(m, 710 "\n%5d 0x%pK-0x%pK %c%c%c%c%c%c 0x%08lx000", 711 pt->pid, 712 (void *)vma->vm_start, (void *)vma->vm_end, 713 vma->vm_flags & VM_READ ? 'r' : '-', 714 vma->vm_flags & VM_WRITE ? 'w' : '-', 715 vma->vm_flags & VM_EXEC ? 'x' : '-', 716 vma->vm_flags & VM_MAYSHARE ? 's' : 'p', 717 vma->vm_flags & VM_LOCKED ? 'l' : '-', 718 vma->vm_flags & VM_IO ? 'i' : '-', 719 vma->vm_pgoff); 720 721#if defined(__i386__) 722 pgprot = pgprot_val(vma->vm_page_prot); 723 seq_printf(m, " %c%c%c%c%c%c%c%c%c", 724 pgprot & _PAGE_PRESENT ? 'p' : '-', 725 pgprot & _PAGE_RW ? 'w' : 'r', 726 pgprot & _PAGE_USER ? 'u' : 's', 727 pgprot & _PAGE_PWT ? 't' : 'b', 728 pgprot & _PAGE_PCD ? 'u' : 'c', 729 pgprot & _PAGE_ACCESSED ? 'a' : '-', 730 pgprot & _PAGE_DIRTY ? 'd' : '-', 731 pgprot & _PAGE_PSE ? 'm' : 'k', 732 pgprot & _PAGE_GLOBAL ? 'g' : 'l'); 733#endif 734 seq_printf(m, "\n"); 735 } 736 mutex_unlock(&dev->struct_mutex); 737 return 0; 738} 739