1 /************************************************************************** 2 * 3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 /* 28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 29 */ 30 31 #define pr_fmt(fmt) "[TTM] " fmt 32 33 #include <ttm/ttm_module.h> 34 #include <ttm/ttm_bo_driver.h> 35 #include <ttm/ttm_bo_api.h> 36 #include <ttm/ttm_placement.h> 37 #include <drm/drm_vma_manager.h> 38 #include <linux/mm.h> 39 #include <linux/pfn_t.h> 40 #include <linux/rbtree.h> 41 #include <linux/module.h> 42 #include <linux/uaccess.h> 43 44 #include <sys/sysctl.h> 45 #include <vm/vm.h> 46 #include <vm/vm_page.h> 47 #include <vm/vm_page2.h> 48 49 #define TTM_BO_VM_NUM_PREFAULT 16 50 51 static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo, 52 struct vm_area_struct *vma, 53 struct vm_fault *vmf) 54 { 55 int ret = 0; 56 57 if (likely(!bo->moving)) 58 goto out_unlock; 59 60 /* 61 * Quick non-stalling check for idle. 62 */ 63 if (dma_fence_is_signaled(bo->moving)) 64 goto out_clear; 65 66 /* 67 * If possible, avoid waiting for GPU with mmap_sem 68 * held. 69 */ 70 if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { 71 ret = VM_FAULT_RETRY; 72 if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT) 73 goto out_unlock; 74 75 ttm_bo_reference(bo); 76 up_read(&vma->vm_mm->mmap_sem); 77 (void) dma_fence_wait(bo->moving, true); 78 ttm_bo_unreserve(bo); 79 ttm_bo_unref(&bo); 80 goto out_unlock; 81 } 82 83 /* 84 * Ordinary wait. 85 */ 86 ret = dma_fence_wait(bo->moving, true); 87 if (unlikely(ret != 0)) { 88 ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS : 89 VM_FAULT_NOPAGE; 90 goto out_unlock; 91 } 92 93 out_clear: 94 dma_fence_put(bo->moving); 95 bo->moving = NULL; 96 97 out_unlock: 98 return ret; 99 } 100 101 /* 102 * Always unstall on unexpected vm_page alias, fatal bus fault. 103 * Set to 0 to stall, set to positive count to unstall N times, 104 * then stall again. 105 */ 106 static int drm_unstall = -1; 107 SYSCTL_INT(_debug, OID_AUTO, unstall, CTLFLAG_RW, &drm_unstall, 0, ""); 108 109 static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 110 { 111 /* see ttm_bo_mmap_single() at end of this file */ 112 /* ttm_bo_vm_ops not currently used, no entry should occur */ 113 panic("ttm_bo_vm_fault"); 114 #if 0 115 struct ttm_buffer_object *bo = (struct ttm_buffer_object *) 116 vma->vm_private_data; 117 struct ttm_bo_device *bdev = bo->bdev; 118 unsigned long page_offset; 119 unsigned long page_last; 120 unsigned long pfn; 121 struct ttm_tt *ttm = NULL; 122 struct page *page; 123 int ret; 124 int i; 125 unsigned long address = vmf->address; 126 int retval = VM_FAULT_NOPAGE; 127 struct ttm_mem_type_manager *man = 128 &bdev->man[bo->mem.mem_type]; 129 struct vm_area_struct cvma; 130 131 /* 132 * Work around locking order reversal in fault / nopfn 133 * between mmap_sem and bo_reserve: Perform a trylock operation 134 * for reserve, and if it fails, retry the fault after waiting 135 * for the buffer to become unreserved. 136 */ 137 ret = ttm_bo_reserve(bo, true, true, NULL); 138 if (unlikely(ret != 0)) { 139 if (ret != -EBUSY) 140 return VM_FAULT_NOPAGE; 141 142 if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { 143 if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { 144 ttm_bo_reference(bo); 145 up_read(&vma->vm_mm->mmap_sem); 146 (void) ttm_bo_wait_unreserved(bo); 147 ttm_bo_unref(&bo); 148 } 149 150 return VM_FAULT_RETRY; 151 } 152 153 /* 154 * If we'd want to change locking order to 155 * mmap_sem -> bo::reserve, we'd use a blocking reserve here 156 * instead of retrying the fault... 157 */ 158 return VM_FAULT_NOPAGE; 159 } 160 161 /* 162 * Refuse to fault imported pages. This should be handled 163 * (if at all) by redirecting mmap to the exporter. 164 */ 165 if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) { 166 retval = VM_FAULT_SIGBUS; 167 goto out_unlock; 168 } 169 170 if (bdev->driver->fault_reserve_notify) { 171 ret = bdev->driver->fault_reserve_notify(bo); 172 switch (ret) { 173 case 0: 174 break; 175 case -EBUSY: 176 case -ERESTARTSYS: 177 retval = VM_FAULT_NOPAGE; 178 goto out_unlock; 179 default: 180 retval = VM_FAULT_SIGBUS; 181 goto out_unlock; 182 } 183 } 184 185 /* 186 * Wait for buffer data in transit, due to a pipelined 187 * move. 188 */ 189 190 ret = ttm_bo_vm_fault_idle(bo, vma, vmf); 191 if (unlikely(ret != 0)) { 192 retval = ret; 193 194 if (retval == VM_FAULT_RETRY && 195 !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { 196 /* The BO has already been unreserved. */ 197 return retval; 198 } 199 200 goto out_unlock; 201 } 202 203 ret = ttm_mem_io_lock(man, true); 204 if (unlikely(ret != 0)) { 205 retval = VM_FAULT_NOPAGE; 206 goto out_unlock; 207 } 208 ret = ttm_mem_io_reserve_vm(bo); 209 if (unlikely(ret != 0)) { 210 retval = VM_FAULT_SIGBUS; 211 goto out_io_unlock; 212 } 213 214 page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + 215 vma->vm_pgoff - drm_vma_node_start(&bo->vma_node); 216 page_last = vma_pages(vma) + vma->vm_pgoff - 217 drm_vma_node_start(&bo->vma_node); 218 219 if (unlikely(page_offset >= bo->num_pages)) { 220 retval = VM_FAULT_SIGBUS; 221 goto out_io_unlock; 222 } 223 224 /* 225 * Make a local vma copy to modify the page_prot member 226 * and vm_flags if necessary. The vma parameter is protected 227 * by mmap_sem in write mode. 228 */ 229 cvma = *vma; 230 cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags); 231 232 if (bo->mem.bus.is_iomem) { 233 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, 234 cvma.vm_page_prot); 235 } else { 236 ttm = bo->ttm; 237 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, 238 cvma.vm_page_prot); 239 240 /* Allocate all page at once, most common usage */ 241 if (ttm->bdev->driver->ttm_tt_populate(ttm)) { 242 retval = VM_FAULT_OOM; 243 goto out_io_unlock; 244 } 245 } 246 247 /* 248 * Speculatively prefault a number of pages. Only error on 249 * first page. 250 */ 251 for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) { 252 if (bo->mem.bus.is_iomem) 253 pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset; 254 else { 255 page = ttm->pages[page_offset]; 256 if (unlikely(!page && i == 0)) { 257 retval = VM_FAULT_OOM; 258 goto out_io_unlock; 259 } else if (unlikely(!page)) { 260 break; 261 } 262 page->mapping = vma->vm_file->f_mapping; 263 page->index = drm_vma_node_start(&bo->vma_node) + 264 page_offset; 265 pfn = page_to_pfn(page); 266 } 267 268 if (vma->vm_flags & VM_MIXEDMAP) 269 ret = vm_insert_mixed(&cvma, address, 270 __pfn_to_pfn_t(pfn, PFN_DEV)); 271 else 272 ret = vm_insert_pfn(&cvma, address, pfn); 273 274 /* 275 * Somebody beat us to this PTE or prefaulting to 276 * an already populated PTE, or prefaulting error. 277 */ 278 279 if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0))) 280 break; 281 else if (unlikely(ret != 0)) { 282 retval = 283 (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 284 goto out_io_unlock; 285 } 286 287 address += PAGE_SIZE; 288 if (unlikely(++page_offset >= page_last)) 289 break; 290 } 291 out_io_unlock: 292 ttm_mem_io_unlock(man); 293 out_unlock: 294 ttm_bo_unreserve(bo); 295 return retval; 296 #endif 297 } 298 299 /* ttm_bo_vm_ops not currently used, no entry should occur */ 300 static void ttm_bo_vm_open(struct vm_area_struct *vma) 301 { 302 struct ttm_buffer_object *bo = 303 (struct ttm_buffer_object *)vma->vm_private_data; 304 305 #if 0 306 WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping); 307 #endif 308 309 (void)ttm_bo_reference(bo); 310 } 311 312 /* ttm_bo_vm_ops not currently used, no entry should occur */ 313 static void ttm_bo_vm_close(struct vm_area_struct *vma) 314 { 315 struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data; 316 317 ttm_bo_unref(&bo); 318 vma->vm_private_data = NULL; 319 } 320 321 static const struct vm_operations_struct ttm_bo_vm_ops = { 322 .fault = ttm_bo_vm_fault, 323 .open = ttm_bo_vm_open, 324 .close = ttm_bo_vm_close 325 }; 326 327 static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev, 328 unsigned long offset, 329 unsigned long pages) 330 { 331 struct drm_vma_offset_node *node; 332 struct ttm_buffer_object *bo = NULL; 333 334 drm_vma_offset_lock_lookup(&bdev->vma_manager); 335 336 node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages); 337 if (likely(node)) { 338 bo = container_of(node, struct ttm_buffer_object, vma_node); 339 if (!kref_get_unless_zero(&bo->kref)) 340 bo = NULL; 341 } 342 343 drm_vma_offset_unlock_lookup(&bdev->vma_manager); 344 345 if (!bo) 346 pr_err("Could not find buffer object to map\n"); 347 348 return bo; 349 } 350 351 unsigned long ttm_bo_default_io_mem_pfn(struct ttm_buffer_object *bo, 352 unsigned long page_offset) 353 { 354 return ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) 355 + page_offset; 356 } 357 EXPORT_SYMBOL(ttm_bo_default_io_mem_pfn); 358 359 int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, 360 struct ttm_bo_device *bdev) 361 { 362 struct ttm_bo_driver *driver; 363 struct ttm_buffer_object *bo; 364 int ret; 365 366 bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma)); 367 if (unlikely(!bo)) 368 return -EINVAL; 369 370 driver = bo->bdev->driver; 371 if (unlikely(!driver->verify_access)) { 372 ret = -EPERM; 373 goto out_unref; 374 } 375 ret = driver->verify_access(bo, filp); 376 if (unlikely(ret != 0)) 377 goto out_unref; 378 379 vma->vm_ops = &ttm_bo_vm_ops; 380 381 /* 382 * Note: We're transferring the bo reference to 383 * vma->vm_private_data here. 384 */ 385 386 vma->vm_private_data = bo; 387 388 /* 389 * We'd like to use VM_PFNMAP on shared mappings, where 390 * (vma->vm_flags & VM_SHARED) != 0, for performance reasons, 391 * but for some reason VM_PFNMAP + x86 PAT + write-combine is very 392 * bad for performance. Until that has been sorted out, use 393 * VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719 394 */ 395 vma->vm_flags |= VM_MIXEDMAP; 396 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 397 return 0; 398 out_unref: 399 ttm_bo_unref(&bo); 400 return ret; 401 } 402 EXPORT_SYMBOL(ttm_bo_mmap); 403 404 int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) 405 { 406 if (vma->vm_pgoff != 0) 407 return -EACCES; 408 409 vma->vm_ops = &ttm_bo_vm_ops; 410 vma->vm_private_data = ttm_bo_reference(bo); 411 vma->vm_flags |= VM_MIXEDMAP; 412 vma->vm_flags |= VM_IO | VM_DONTEXPAND; 413 return 0; 414 } 415 EXPORT_SYMBOL(ttm_fbdev_mmap); 416 417 /* 418 * DragonFlyBSD Interface 419 */ 420 421 #include "opt_vm.h" 422 423 /* 424 * NOTE: This code is fragile. This code can only be entered with *mres 425 * not NULL when *mres is a placeholder page allocated by the kernel. 426 */ 427 static int 428 ttm_bo_vm_fault_dfly(vm_object_t vm_obj, vm_ooffset_t offset, 429 int prot, vm_page_t *mres) 430 { 431 struct ttm_buffer_object *bo = vm_obj->handle; 432 struct ttm_bo_device *bdev = bo->bdev; 433 struct ttm_tt *ttm = NULL; 434 vm_page_t m; 435 int ret; 436 int retval = VM_PAGER_OK; 437 struct ttm_mem_type_manager *man = 438 &bdev->man[bo->mem.mem_type]; 439 struct vm_area_struct cvma; 440 441 /* 442 The Linux code expects to receive these arguments: 443 - struct vm_area_struct *vma 444 - struct vm_fault *vmf 445 */ 446 #ifdef __DragonFly__ 447 struct vm_area_struct vmas; 448 struct vm_area_struct *vma = &vmas; 449 struct vm_fault vmfs; 450 struct vm_fault *vmf = &vmfs; 451 452 memset(vma, 0, sizeof(*vma)); 453 memset(vmf, 0, sizeof(*vmf)); 454 #endif 455 456 vm_object_pip_add(vm_obj, 1); 457 458 /* 459 * OBJT_MGTDEVICE does not pre-allocate the page. 460 */ 461 KKASSERT(*mres == NULL); 462 463 retry: 464 m = NULL; 465 466 /* 467 * Work around locking order reversal in fault / nopfn 468 * between mmap_sem and bo_reserve: Perform a trylock operation 469 * for reserve, and if it fails, retry the fault after waiting 470 * for the buffer to become unreserved. 471 */ 472 ret = ttm_bo_reserve(bo, true, true, NULL); 473 if (unlikely(ret != 0)) { 474 if (ret != -EBUSY) { 475 retval = VM_PAGER_ERROR; 476 goto out_unlock2; 477 } 478 479 if ((vmf->flags & FAULT_FLAG_ALLOW_RETRY) || 1) { 480 if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { 481 up_read(&vma->vm_mm->mmap_sem); 482 (void) ttm_bo_wait_unreserved(bo); 483 } 484 485 lwkt_yield(); 486 goto retry; 487 } 488 489 /* 490 * If we'd want to change locking order to 491 * mmap_sem -> bo::reserve, we'd use a blocking reserve here 492 * instead of retrying the fault... 493 */ 494 retval = VM_PAGER_ERROR; 495 goto out_unlock2; 496 } 497 498 if (bdev->driver->fault_reserve_notify) { 499 ret = bdev->driver->fault_reserve_notify(bo); 500 switch (ret) { 501 case 0: 502 break; 503 case -EBUSY: 504 lwkt_yield(); 505 /* fall through */ 506 case -ERESTARTSYS: 507 case -EINTR: 508 retval = VM_PAGER_ERROR; 509 goto out_unlock1; 510 default: 511 retval = VM_PAGER_ERROR; 512 goto out_unlock1; 513 } 514 } 515 516 /* 517 * Wait for buffer data in transit, due to a pipelined 518 * move. 519 */ 520 ret = ttm_bo_vm_fault_idle(bo, vma, vmf); 521 if (unlikely(ret != 0)) { 522 retval = VM_PAGER_ERROR; 523 goto out_unlock1; 524 } 525 526 ret = ttm_mem_io_lock(man, true); 527 if (unlikely(ret != 0)) { 528 retval = VM_PAGER_ERROR; 529 goto out_unlock1; 530 } 531 ret = ttm_mem_io_reserve_vm(bo); 532 if (unlikely(ret != 0)) { 533 retval = VM_PAGER_ERROR; 534 goto out_io_unlock1; 535 } 536 if (unlikely(OFF_TO_IDX(offset) >= bo->num_pages)) { 537 retval = VM_PAGER_ERROR; 538 goto out_io_unlock1; 539 } 540 541 /* 542 * Lookup the real page. 543 * 544 * Strictly, we're not allowed to modify vma->vm_page_prot here, 545 * since the mmap_sem is only held in read mode. However, we 546 * modify only the caching bits of vma->vm_page_prot and 547 * consider those bits protected by 548 * the bo->mutex, as we should be the only writers. 549 * There shouldn't really be any readers of these bits except 550 * within vm_insert_mixed()? fork? 551 * 552 * TODO: Add a list of vmas to the bo, and change the 553 * vma->vm_page_prot when the object changes caching policy, with 554 * the correct locks held. 555 */ 556 557 /* 558 * Make a local vma copy to modify the page_prot member 559 * and vm_flags if necessary. The vma parameter is protected 560 * by mmap_sem in write mode. 561 */ 562 cvma = *vma; 563 #if 0 564 cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags); 565 #else 566 cvma.vm_page_prot = 0; 567 #endif 568 569 if (bo->mem.bus.is_iomem) { 570 #ifdef __DragonFly__ 571 m = vm_phys_fictitious_to_vm_page(bo->mem.bus.base + 572 bo->mem.bus.offset + offset); 573 pmap_page_set_memattr(m, ttm_io_prot(bo->mem.placement, 0)); 574 #endif 575 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, 576 cvma.vm_page_prot); 577 } else { 578 ttm = bo->ttm; 579 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, 580 cvma.vm_page_prot); 581 582 /* Allocate all page at once, most common usage */ 583 if (ttm->bdev->driver->ttm_tt_populate(ttm)) { 584 retval = VM_PAGER_ERROR; 585 goto out_io_unlock1; 586 } 587 588 m = (struct vm_page *)ttm->pages[OFF_TO_IDX(offset)]; 589 if (unlikely(!m)) { 590 retval = VM_PAGER_ERROR; 591 goto out_io_unlock1; 592 } 593 pmap_page_set_memattr(m, 594 (bo->mem.placement & TTM_PL_FLAG_CACHED) ? 595 VM_MEMATTR_WRITE_BACK : ttm_io_prot(bo->mem.placement, 0)); 596 } 597 598 if (vm_page_busy_try(m, FALSE)) { 599 kprintf("r"); 600 vm_page_sleep_busy(m, FALSE, "ttmvmf"); 601 ttm_mem_io_unlock(man); 602 ttm_bo_unreserve(bo); 603 goto retry; 604 } 605 606 /* 607 * Return our fake page BUSYd. Do not index it into the VM object. 608 * The caller will enter it into the pmap. 609 */ 610 m->valid = VM_PAGE_BITS_ALL; 611 *mres = m; 612 613 out_io_unlock1: 614 ttm_mem_io_unlock(man); 615 out_unlock1: 616 ttm_bo_unreserve(bo); 617 out_unlock2: 618 vm_object_pip_wakeup(vm_obj); 619 return (retval); 620 } 621 622 static int 623 ttm_bo_vm_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot, 624 vm_ooffset_t foff, struct ucred *cred, u_short *color) 625 { 626 627 /* 628 * On Linux, a reference to the buffer object is acquired here. 629 * The reason is that this function is not called when the 630 * mmap() is initialized, but only when a process forks for 631 * instance. Therefore on Linux, the reference on the bo is 632 * acquired either in ttm_bo_mmap() or ttm_bo_vm_open(). It's 633 * then released in ttm_bo_vm_close(). 634 * 635 * Here, this function is called during mmap() intialization. 636 * Thus, the reference acquired in ttm_bo_mmap_single() is 637 * sufficient. 638 */ 639 *color = 0; 640 return (0); 641 } 642 643 static void 644 ttm_bo_vm_dtor(void *handle) 645 { 646 struct ttm_buffer_object *bo = handle; 647 648 ttm_bo_unref(&bo); 649 } 650 651 static struct cdev_pager_ops ttm_pager_ops = { 652 .cdev_pg_fault = ttm_bo_vm_fault_dfly, 653 .cdev_pg_ctor = ttm_bo_vm_ctor, 654 .cdev_pg_dtor = ttm_bo_vm_dtor 655 }; 656 657 /* 658 * Called from drm_drv.c 659 * 660 * *offset - object offset in bytes 661 * size - map size in bytes 662 * 663 * We setup a dummy vma (for now) and call ttm_bo_mmap(). Then we setup 664 * our own VM object and dfly ops. Note that the ops supplied by 665 * ttm_bo_mmap() are not currently used. 666 */ 667 int 668 ttm_bo_mmap_single(struct drm_device *dev, vm_ooffset_t *offset, 669 vm_size_t size, struct vm_object **obj_res, int nprot) 670 { 671 struct ttm_bo_device *bdev = dev->drm_ttm_bdev; 672 struct ttm_buffer_object *bo; 673 struct vm_object *vm_obj; 674 struct vm_area_struct vma; 675 int ret; 676 677 *obj_res = NULL; 678 679 bzero(&vma, sizeof(vma)); 680 vma.vm_start = *offset; /* bdev-relative offset */ 681 vma.vm_end = vma.vm_start + size; 682 vma.vm_pgoff = vma.vm_start >> PAGE_SHIFT; 683 /* vma.vm_page_prot */ 684 /* vma.vm_flags */ 685 686 /* 687 * Call the linux-ported code to do the work, and on success just 688 * setup our own VM object and ignore what the linux code did other 689 * then supplying us the 'bo'. 690 */ 691 ret = ttm_bo_mmap(NULL, &vma, bdev); 692 693 if (ret == 0) { 694 bo = vma.vm_private_data; 695 vm_obj = cdev_pager_allocate(bo, OBJT_MGTDEVICE, 696 &ttm_pager_ops, 697 size, nprot, 0, 698 curthread->td_ucred); 699 if (vm_obj) { 700 *obj_res = vm_obj; 701 *offset = 0; /* object-relative offset */ 702 } else { 703 ttm_bo_unref(&bo); 704 ret = EINVAL; 705 } 706 } 707 return ret; 708 } 709 EXPORT_SYMBOL(ttm_bo_mmap_single); 710 711 #ifdef __DragonFly__ 712 void ttm_bo_release_mmap(struct ttm_buffer_object *bo); 713 714 void 715 ttm_bo_release_mmap(struct ttm_buffer_object *bo) 716 { 717 vm_object_t vm_obj; 718 719 vm_obj = cdev_pager_lookup(bo); 720 if (vm_obj == NULL) 721 return; 722 723 VM_OBJECT_LOCK(vm_obj); 724 vm_object_page_remove(vm_obj, 0, 0, false); 725 VM_OBJECT_UNLOCK(vm_obj); 726 727 vm_object_deallocate(vm_obj); 728 } 729 #endif 730 731 #if 0 732 int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) 733 { 734 if (vma->vm_pgoff != 0) 735 return -EACCES; 736 737 vma->vm_ops = &ttm_bo_vm_ops; 738 vma->vm_private_data = ttm_bo_reference(bo); 739 vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND; 740 return 0; 741 } 742 EXPORT_SYMBOL(ttm_fbdev_mmap); 743 #endif 744