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 #include <linux/mem_encrypt.h> 44 45 #include <sys/sysctl.h> 46 #include <vm/vm.h> 47 #include <vm/vm_page.h> 48 #include <vm/vm_page2.h> 49 50 #define TTM_BO_VM_NUM_PREFAULT 16 51 52 static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo, 53 struct vm_area_struct *vma, 54 struct vm_fault *vmf) 55 { 56 int ret = 0; 57 58 if (likely(!bo->moving)) 59 goto out_unlock; 60 61 /* 62 * Quick non-stalling check for idle. 63 */ 64 if (dma_fence_is_signaled(bo->moving)) 65 goto out_clear; 66 67 /* 68 * If possible, avoid waiting for GPU with mmap_sem 69 * held. 70 */ 71 if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { 72 ret = VM_FAULT_RETRY; 73 if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT) 74 goto out_unlock; 75 76 ttm_bo_reference(bo); 77 up_read(&vma->vm_mm->mmap_sem); 78 (void) dma_fence_wait(bo->moving, true); 79 ttm_bo_unreserve(bo); 80 ttm_bo_unref(&bo); 81 goto out_unlock; 82 } 83 84 /* 85 * Ordinary wait. 86 */ 87 ret = dma_fence_wait(bo->moving, true); 88 if (unlikely(ret != 0)) { 89 ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS : 90 VM_FAULT_NOPAGE; 91 goto out_unlock; 92 } 93 94 out_clear: 95 dma_fence_put(bo->moving); 96 bo->moving = NULL; 97 98 out_unlock: 99 return ret; 100 } 101 102 /* 103 * Always unstall on unexpected vm_page alias, fatal bus fault. 104 * Set to 0 to stall, set to positive count to unstall N times, 105 * then stall again. 106 */ 107 static int drm_unstall = -1; 108 SYSCTL_INT(_debug, OID_AUTO, unstall, CTLFLAG_RW, &drm_unstall, 0, ""); 109 110 static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 111 { 112 /* see ttm_bo_mmap_single() at end of this file */ 113 /* ttm_bo_vm_ops not currently used, no entry should occur */ 114 panic("ttm_bo_vm_fault"); 115 #if 0 116 struct ttm_buffer_object *bo = (struct ttm_buffer_object *) 117 vma->vm_private_data; 118 struct ttm_bo_device *bdev = bo->bdev; 119 unsigned long page_offset; 120 unsigned long page_last; 121 unsigned long pfn; 122 struct ttm_tt *ttm = NULL; 123 struct page *page; 124 int ret; 125 int i; 126 unsigned long address = vmf->address; 127 int retval = VM_FAULT_NOPAGE; 128 struct ttm_mem_type_manager *man = 129 &bdev->man[bo->mem.mem_type]; 130 struct vm_area_struct cvma; 131 132 /* 133 * Work around locking order reversal in fault / nopfn 134 * between mmap_sem and bo_reserve: Perform a trylock operation 135 * for reserve, and if it fails, retry the fault after waiting 136 * for the buffer to become unreserved. 137 */ 138 ret = ttm_bo_reserve(bo, true, true, NULL); 139 if (unlikely(ret != 0)) { 140 if (ret != -EBUSY) 141 return VM_FAULT_NOPAGE; 142 143 if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { 144 if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { 145 ttm_bo_reference(bo); 146 up_read(&vma->vm_mm->mmap_sem); 147 (void) ttm_bo_wait_unreserved(bo); 148 ttm_bo_unref(&bo); 149 } 150 151 return VM_FAULT_RETRY; 152 } 153 154 /* 155 * If we'd want to change locking order to 156 * mmap_sem -> bo::reserve, we'd use a blocking reserve here 157 * instead of retrying the fault... 158 */ 159 return VM_FAULT_NOPAGE; 160 } 161 162 /* 163 * Refuse to fault imported pages. This should be handled 164 * (if at all) by redirecting mmap to the exporter. 165 */ 166 if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) { 167 retval = VM_FAULT_SIGBUS; 168 goto out_unlock; 169 } 170 171 if (bdev->driver->fault_reserve_notify) { 172 ret = bdev->driver->fault_reserve_notify(bo); 173 switch (ret) { 174 case 0: 175 break; 176 case -EBUSY: 177 case -ERESTARTSYS: 178 retval = VM_FAULT_NOPAGE; 179 goto out_unlock; 180 default: 181 retval = VM_FAULT_SIGBUS; 182 goto out_unlock; 183 } 184 } 185 186 /* 187 * Wait for buffer data in transit, due to a pipelined 188 * move. 189 */ 190 191 ret = ttm_bo_vm_fault_idle(bo, vma, vmf); 192 if (unlikely(ret != 0)) { 193 retval = ret; 194 195 if (retval == VM_FAULT_RETRY && 196 !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { 197 /* The BO has already been unreserved. */ 198 return retval; 199 } 200 201 goto out_unlock; 202 } 203 204 ret = ttm_mem_io_lock(man, true); 205 if (unlikely(ret != 0)) { 206 retval = VM_FAULT_NOPAGE; 207 goto out_unlock; 208 } 209 ret = ttm_mem_io_reserve_vm(bo); 210 if (unlikely(ret != 0)) { 211 retval = VM_FAULT_SIGBUS; 212 goto out_io_unlock; 213 } 214 215 page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + 216 vma->vm_pgoff - drm_vma_node_start(&bo->vma_node); 217 page_last = vma_pages(vma) + vma->vm_pgoff - 218 drm_vma_node_start(&bo->vma_node); 219 220 if (unlikely(page_offset >= bo->num_pages)) { 221 retval = VM_FAULT_SIGBUS; 222 goto out_io_unlock; 223 } 224 225 /* 226 * Make a local vma copy to modify the page_prot member 227 * and vm_flags if necessary. The vma parameter is protected 228 * by mmap_sem in write mode. 229 */ 230 cvma = *vma; 231 cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags); 232 233 if (bo->mem.bus.is_iomem) { 234 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, 235 cvma.vm_page_prot); 236 } else { 237 ttm = bo->ttm; 238 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, 239 cvma.vm_page_prot); 240 241 /* Allocate all page at once, most common usage */ 242 if (ttm->bdev->driver->ttm_tt_populate(ttm)) { 243 retval = VM_FAULT_OOM; 244 goto out_io_unlock; 245 } 246 } 247 248 /* 249 * Speculatively prefault a number of pages. Only error on 250 * first page. 251 */ 252 for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) { 253 if (bo->mem.bus.is_iomem) 254 pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset; 255 else { 256 page = ttm->pages[page_offset]; 257 if (unlikely(!page && i == 0)) { 258 retval = VM_FAULT_OOM; 259 goto out_io_unlock; 260 } else if (unlikely(!page)) { 261 break; 262 } 263 page->mapping = vma->vm_file->f_mapping; 264 page->index = drm_vma_node_start(&bo->vma_node) + 265 page_offset; 266 pfn = page_to_pfn(page); 267 } 268 269 if (vma->vm_flags & VM_MIXEDMAP) 270 ret = vm_insert_mixed(&cvma, address, 271 __pfn_to_pfn_t(pfn, PFN_DEV)); 272 else 273 ret = vm_insert_pfn(&cvma, address, pfn); 274 275 /* 276 * Somebody beat us to this PTE or prefaulting to 277 * an already populated PTE, or prefaulting error. 278 */ 279 280 if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0))) 281 break; 282 else if (unlikely(ret != 0)) { 283 retval = 284 (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 285 goto out_io_unlock; 286 } 287 288 address += PAGE_SIZE; 289 if (unlikely(++page_offset >= page_last)) 290 break; 291 } 292 out_io_unlock: 293 ttm_mem_io_unlock(man); 294 out_unlock: 295 ttm_bo_unreserve(bo); 296 return retval; 297 #endif 298 } 299 300 /* ttm_bo_vm_ops not currently used, no entry should occur */ 301 static void ttm_bo_vm_open(struct vm_area_struct *vma) 302 { 303 struct ttm_buffer_object *bo = 304 (struct ttm_buffer_object *)vma->vm_private_data; 305 306 #if 0 307 WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping); 308 #endif 309 310 (void)ttm_bo_reference(bo); 311 } 312 313 /* ttm_bo_vm_ops not currently used, no entry should occur */ 314 static void ttm_bo_vm_close(struct vm_area_struct *vma) 315 { 316 struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data; 317 318 ttm_bo_unref(&bo); 319 vma->vm_private_data = NULL; 320 } 321 322 static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo, 323 unsigned long offset, 324 uint8_t *buf, int len, int write) 325 { 326 unsigned long page = offset >> PAGE_SHIFT; 327 unsigned long bytes_left = len; 328 int ret; 329 330 /* Copy a page at a time, that way no extra virtual address 331 * mapping is needed 332 */ 333 offset -= page << PAGE_SHIFT; 334 do { 335 unsigned long bytes = min(bytes_left, PAGE_SIZE - offset); 336 struct ttm_bo_kmap_obj map; 337 void *ptr; 338 bool is_iomem; 339 340 ret = ttm_bo_kmap(bo, page, 1, &map); 341 if (ret) 342 return ret; 343 344 ptr = (uint8_t *)ttm_kmap_obj_virtual(&map, &is_iomem) + offset; 345 WARN_ON_ONCE(is_iomem); 346 if (write) 347 memcpy(ptr, buf, bytes); 348 else 349 memcpy(buf, ptr, bytes); 350 ttm_bo_kunmap(&map); 351 352 page++; 353 buf += bytes; 354 bytes_left -= bytes; 355 offset = 0; 356 } while (bytes_left); 357 358 return len; 359 } 360 361 static int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr, 362 void *buf, int len, int write) 363 { 364 unsigned long offset = (addr) - vma->vm_start; 365 struct ttm_buffer_object *bo = vma->vm_private_data; 366 int ret; 367 368 if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->num_pages) 369 return -EIO; 370 371 ret = ttm_bo_reserve(bo, true, false, NULL); 372 if (ret) 373 return ret; 374 375 switch (bo->mem.mem_type) { 376 case TTM_PL_SYSTEM: 377 if (unlikely(bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { 378 ret = ttm_tt_swapin(bo->ttm); 379 if (unlikely(ret != 0)) 380 return ret; 381 } 382 /* fall through */ 383 case TTM_PL_TT: 384 ret = ttm_bo_vm_access_kmap(bo, offset, buf, len, write); 385 break; 386 default: 387 if (bo->bdev->driver->access_memory) 388 ret = bo->bdev->driver->access_memory( 389 bo, offset, buf, len, write); 390 else 391 ret = -EIO; 392 } 393 394 ttm_bo_unreserve(bo); 395 396 return ret; 397 } 398 399 static const struct vm_operations_struct ttm_bo_vm_ops = { 400 .fault = ttm_bo_vm_fault, 401 .open = ttm_bo_vm_open, 402 .close = ttm_bo_vm_close, 403 .access = ttm_bo_vm_access 404 }; 405 406 static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev, 407 unsigned long offset, 408 unsigned long pages) 409 { 410 struct drm_vma_offset_node *node; 411 struct ttm_buffer_object *bo = NULL; 412 413 drm_vma_offset_lock_lookup(&bdev->vma_manager); 414 415 node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages); 416 if (likely(node)) { 417 bo = container_of(node, struct ttm_buffer_object, vma_node); 418 if (!kref_get_unless_zero(&bo->kref)) 419 bo = NULL; 420 } 421 422 drm_vma_offset_unlock_lookup(&bdev->vma_manager); 423 424 if (!bo) 425 pr_err("Could not find buffer object to map\n"); 426 427 return bo; 428 } 429 430 unsigned long ttm_bo_default_io_mem_pfn(struct ttm_buffer_object *bo, 431 unsigned long page_offset) 432 { 433 return ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) 434 + page_offset; 435 } 436 EXPORT_SYMBOL(ttm_bo_default_io_mem_pfn); 437 438 int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, 439 struct ttm_bo_device *bdev) 440 { 441 struct ttm_bo_driver *driver; 442 struct ttm_buffer_object *bo; 443 int ret; 444 445 bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma)); 446 if (unlikely(!bo)) 447 return -EINVAL; 448 449 driver = bo->bdev->driver; 450 if (unlikely(!driver->verify_access)) { 451 ret = -EPERM; 452 goto out_unref; 453 } 454 ret = driver->verify_access(bo, filp); 455 if (unlikely(ret != 0)) 456 goto out_unref; 457 458 vma->vm_ops = &ttm_bo_vm_ops; 459 460 /* 461 * Note: We're transferring the bo reference to 462 * vma->vm_private_data here. 463 */ 464 465 vma->vm_private_data = bo; 466 467 /* 468 * We'd like to use VM_PFNMAP on shared mappings, where 469 * (vma->vm_flags & VM_SHARED) != 0, for performance reasons, 470 * but for some reason VM_PFNMAP + x86 PAT + write-combine is very 471 * bad for performance. Until that has been sorted out, use 472 * VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719 473 */ 474 vma->vm_flags |= VM_MIXEDMAP; 475 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 476 return 0; 477 out_unref: 478 ttm_bo_unref(&bo); 479 return ret; 480 } 481 EXPORT_SYMBOL(ttm_bo_mmap); 482 483 int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) 484 { 485 if (vma->vm_pgoff != 0) 486 return -EACCES; 487 488 vma->vm_ops = &ttm_bo_vm_ops; 489 vma->vm_private_data = ttm_bo_reference(bo); 490 vma->vm_flags |= VM_MIXEDMAP; 491 vma->vm_flags |= VM_IO | VM_DONTEXPAND; 492 return 0; 493 } 494 EXPORT_SYMBOL(ttm_fbdev_mmap); 495 496 /* 497 * DragonFlyBSD Interface 498 */ 499 500 #include "opt_vm.h" 501 502 /* 503 * NOTE: This code is fragile. This code can only be entered with *mres 504 * not NULL when *mres is a placeholder page allocated by the kernel. 505 */ 506 static int 507 ttm_bo_vm_fault_dfly(vm_object_t vm_obj, vm_ooffset_t offset, 508 int prot, vm_page_t *mres) 509 { 510 struct ttm_buffer_object *bo = vm_obj->handle; 511 struct ttm_bo_device *bdev = bo->bdev; 512 struct ttm_tt *ttm = NULL; 513 vm_page_t m; 514 int ret; 515 int retval = VM_PAGER_OK; 516 struct ttm_mem_type_manager *man = 517 &bdev->man[bo->mem.mem_type]; 518 struct vm_area_struct cvma; 519 520 /* 521 The Linux code expects to receive these arguments: 522 - struct vm_area_struct *vma 523 - struct vm_fault *vmf 524 */ 525 #ifdef __DragonFly__ 526 struct vm_area_struct vmas; 527 struct vm_area_struct *vma = &vmas; 528 struct vm_fault vmfs; 529 struct vm_fault *vmf = &vmfs; 530 531 memset(vma, 0, sizeof(*vma)); 532 memset(vmf, 0, sizeof(*vmf)); 533 534 vma->vm_mm = current->mm; 535 vmf->vma = vma; 536 #endif 537 538 vm_object_pip_add(vm_obj, 1); 539 540 /* 541 * OBJT_MGTDEVICE does not pre-allocate the page. 542 */ 543 KKASSERT(*mres == NULL); 544 545 retry: 546 /* The Linux page fault handler acquires mmap_sem */ 547 down_read(&vma->vm_mm->mmap_sem); 548 549 m = NULL; 550 551 /* 552 * Work around locking order reversal in fault / nopfn 553 * between mmap_sem and bo_reserve: Perform a trylock operation 554 * for reserve, and if it fails, retry the fault after waiting 555 * for the buffer to become unreserved. 556 */ 557 ret = ttm_bo_reserve(bo, true, true, NULL); 558 if (unlikely(ret != 0)) { 559 if (ret != -EBUSY) { 560 retval = VM_PAGER_ERROR; 561 goto out_unlock2; 562 } 563 564 if (vmf->flags & FAULT_FLAG_ALLOW_RETRY || 1) { 565 if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { 566 up_read(&vma->vm_mm->mmap_sem); 567 (void) ttm_bo_wait_unreserved(bo); 568 } 569 570 #ifndef __DragonFly__ 571 return VM_FAULT_RETRY; 572 #else 573 up_read(&vma->vm_mm->mmap_sem); 574 lwkt_yield(); 575 goto retry; 576 #endif 577 } 578 579 /* 580 * If we'd want to change locking order to 581 * mmap_sem -> bo::reserve, we'd use a blocking reserve here 582 * instead of retrying the fault... 583 */ 584 retval = VM_PAGER_ERROR; 585 goto out_unlock2; 586 } 587 588 if (bdev->driver->fault_reserve_notify) { 589 ret = bdev->driver->fault_reserve_notify(bo); 590 switch (ret) { 591 case 0: 592 break; 593 case -EBUSY: 594 lwkt_yield(); 595 /* fall through */ 596 case -ERESTARTSYS: 597 case -EINTR: 598 retval = VM_PAGER_ERROR; 599 goto out_unlock1; 600 default: 601 retval = VM_PAGER_ERROR; 602 goto out_unlock1; 603 } 604 } 605 606 /* 607 * Wait for buffer data in transit, due to a pipelined 608 * move. 609 */ 610 ret = ttm_bo_vm_fault_idle(bo, vma, vmf); 611 if (unlikely(ret != 0)) { 612 retval = VM_PAGER_ERROR; 613 goto out_unlock1; 614 } 615 616 ret = ttm_mem_io_lock(man, true); 617 if (unlikely(ret != 0)) { 618 retval = VM_PAGER_ERROR; 619 goto out_unlock1; 620 } 621 ret = ttm_mem_io_reserve_vm(bo); 622 if (unlikely(ret != 0)) { 623 retval = VM_PAGER_ERROR; 624 goto out_io_unlock1; 625 } 626 if (unlikely(OFF_TO_IDX(offset) >= bo->num_pages)) { 627 retval = VM_PAGER_ERROR; 628 goto out_io_unlock1; 629 } 630 631 /* 632 * Lookup the real page. 633 * 634 * Strictly, we're not allowed to modify vma->vm_page_prot here, 635 * since the mmap_sem is only held in read mode. However, we 636 * modify only the caching bits of vma->vm_page_prot and 637 * consider those bits protected by 638 * the bo->mutex, as we should be the only writers. 639 * There shouldn't really be any readers of these bits except 640 * within vm_insert_mixed()? fork? 641 * 642 * TODO: Add a list of vmas to the bo, and change the 643 * vma->vm_page_prot when the object changes caching policy, with 644 * the correct locks held. 645 */ 646 647 /* 648 * Make a local vma copy to modify the page_prot member 649 * and vm_flags if necessary. The vma parameter is protected 650 * by mmap_sem in write mode. 651 */ 652 cvma = *vma; 653 #if 0 654 cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags); 655 #else 656 cvma.vm_page_prot = 0; 657 #endif 658 659 if (bo->mem.bus.is_iomem) { 660 #ifdef __DragonFly__ 661 m = vm_phys_fictitious_to_vm_page(bo->mem.bus.base + 662 bo->mem.bus.offset + offset); 663 pmap_page_set_memattr(m, ttm_io_prot(bo->mem.placement, 0)); 664 #endif 665 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, 666 cvma.vm_page_prot); 667 } else { 668 ttm = bo->ttm; 669 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, 670 cvma.vm_page_prot); 671 672 /* Allocate all page at once, most common usage */ 673 if (ttm->bdev->driver->ttm_tt_populate(ttm)) { 674 retval = VM_PAGER_ERROR; 675 goto out_io_unlock1; 676 } 677 678 m = (struct vm_page *)ttm->pages[OFF_TO_IDX(offset)]; 679 if (unlikely(!m)) { 680 retval = VM_PAGER_ERROR; 681 goto out_io_unlock1; 682 } 683 pmap_page_set_memattr(m, 684 (bo->mem.placement & TTM_PL_FLAG_CACHED) ? 685 VM_MEMATTR_WRITE_BACK : ttm_io_prot(bo->mem.placement, 0)); 686 } 687 688 if (vm_page_busy_try(m, FALSE)) { 689 kprintf("r"); 690 vm_page_sleep_busy(m, FALSE, "ttmvmf"); 691 ttm_mem_io_unlock(man); 692 ttm_bo_unreserve(bo); 693 up_read(&vma->vm_mm->mmap_sem); 694 goto retry; 695 } 696 697 /* 698 * Return our fake page BUSYd. Do not index it into the VM object. 699 * The caller will enter it into the pmap. 700 */ 701 m->valid = VM_PAGE_BITS_ALL; 702 *mres = m; 703 704 out_io_unlock1: 705 ttm_mem_io_unlock(man); 706 out_unlock1: 707 ttm_bo_unreserve(bo); 708 out_unlock2: 709 vm_object_pip_wakeup(vm_obj); 710 return (retval); 711 } 712 713 static int 714 ttm_bo_vm_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot, 715 vm_ooffset_t foff, struct ucred *cred, u_short *color) 716 { 717 718 /* 719 * On Linux, a reference to the buffer object is acquired here. 720 * The reason is that this function is not called when the 721 * mmap() is initialized, but only when a process forks for 722 * instance. Therefore on Linux, the reference on the bo is 723 * acquired either in ttm_bo_mmap() or ttm_bo_vm_open(). It's 724 * then released in ttm_bo_vm_close(). 725 * 726 * Here, this function is called during mmap() intialization. 727 * Thus, the reference acquired in ttm_bo_mmap_single() is 728 * sufficient. 729 */ 730 *color = 0; 731 return (0); 732 } 733 734 static void 735 ttm_bo_vm_dtor(void *handle) 736 { 737 struct ttm_buffer_object *bo = handle; 738 739 ttm_bo_unref(&bo); 740 } 741 742 static struct cdev_pager_ops ttm_pager_ops = { 743 .cdev_pg_fault = ttm_bo_vm_fault_dfly, 744 .cdev_pg_ctor = ttm_bo_vm_ctor, 745 .cdev_pg_dtor = ttm_bo_vm_dtor 746 }; 747 748 /* 749 * Called from drm_drv.c 750 * 751 * *offset - object offset in bytes 752 * size - map size in bytes 753 * 754 * We setup a dummy vma (for now) and call ttm_bo_mmap(). Then we setup 755 * our own VM object and dfly ops. Note that the ops supplied by 756 * ttm_bo_mmap() are not currently used. 757 */ 758 int 759 ttm_bo_mmap_single(struct drm_device *dev, vm_ooffset_t *offset, 760 vm_size_t size, struct vm_object **obj_res, int nprot) 761 { 762 struct ttm_bo_device *bdev = dev->drm_ttm_bdev; 763 struct ttm_buffer_object *bo; 764 struct vm_object *vm_obj; 765 struct vm_area_struct vma; 766 int ret; 767 768 *obj_res = NULL; 769 770 bzero(&vma, sizeof(vma)); 771 vma.vm_start = *offset; /* bdev-relative offset */ 772 vma.vm_end = vma.vm_start + size; 773 vma.vm_pgoff = vma.vm_start >> PAGE_SHIFT; 774 /* vma.vm_page_prot */ 775 /* vma.vm_flags */ 776 777 /* 778 * Call the linux-ported code to do the work, and on success just 779 * setup our own VM object and ignore what the linux code did other 780 * then supplying us the 'bo'. 781 */ 782 ret = ttm_bo_mmap(NULL, &vma, bdev); 783 784 if (ret == 0) { 785 bo = vma.vm_private_data; 786 vm_obj = cdev_pager_allocate(bo, OBJT_MGTDEVICE, 787 &ttm_pager_ops, 788 size, nprot, 0, 789 curthread->td_ucred); 790 if (vm_obj) { 791 *obj_res = vm_obj; 792 *offset = 0; /* object-relative offset */ 793 } else { 794 ttm_bo_unref(&bo); 795 ret = EINVAL; 796 } 797 } 798 return ret; 799 } 800 EXPORT_SYMBOL(ttm_bo_mmap_single); 801 802 #ifdef __DragonFly__ 803 void ttm_bo_release_mmap(struct ttm_buffer_object *bo); 804 805 void 806 ttm_bo_release_mmap(struct ttm_buffer_object *bo) 807 { 808 vm_object_t vm_obj; 809 810 vm_obj = cdev_pager_lookup(bo); 811 if (vm_obj == NULL) 812 return; 813 814 VM_OBJECT_LOCK(vm_obj); 815 #if 1 816 vm_object_page_remove(vm_obj, 0, 0, false); 817 #else 818 /* 819 * XXX REMOVED 820 * 821 * We no longer manage the vm pages inside the MGTDEVICE 822 * objects. 823 */ 824 vm_page_t m; 825 int i; 826 827 for (i = 0; i < bo->num_pages; i++) { 828 m = vm_page_lookup_busy_wait(vm_obj, i, TRUE, "ttm_unm"); 829 if (m == NULL) 830 continue; 831 cdev_pager_free_page(vm_obj, m); 832 } 833 #endif 834 VM_OBJECT_UNLOCK(vm_obj); 835 836 vm_object_deallocate(vm_obj); 837 } 838 #endif 839 840 #if 0 841 int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) 842 { 843 if (vma->vm_pgoff != 0) 844 return -EACCES; 845 846 vma->vm_ops = &ttm_bo_vm_ops; 847 vma->vm_private_data = ttm_bo_reference(bo); 848 vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND; 849 return 0; 850 } 851 EXPORT_SYMBOL(ttm_fbdev_mmap); 852 #endif 853