1/* SPDX-License-Identifier: GPL-2.0 OR MIT */ 2/************************************************************************** 3 * 4 * Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA 5 * All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the 9 * "Software"), to deal in the Software without restriction, including 10 * without limitation the rights to use, copy, modify, merge, publish, 11 * distribute, sub license, and/or sell copies of the Software, and to 12 * permit persons to whom the Software is furnished to do so, subject to 13 * the following conditions: 14 * 15 * The above copyright notice and this permission notice (including the 16 * next paragraph) shall be included in all copies or substantial portions 17 * of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 25 * USE OR OTHER DEALINGS IN THE SOFTWARE. 26 * 27 **************************************************************************/ 28/* 29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 30 */ 31 32#include <linux/vmalloc.h> 33 34#include <drm/ttm/ttm_bo.h> 35#include <drm/ttm/ttm_placement.h> 36#include <drm/ttm/ttm_tt.h> 37 38#include <drm/drm_cache.h> 39 40struct ttm_transfer_obj { 41 struct ttm_buffer_object base; 42 struct ttm_buffer_object *bo; 43}; 44 45int ttm_mem_io_reserve(struct ttm_device *bdev, 46 struct ttm_resource *mem) 47{ 48 if (mem->bus.offset || mem->bus.addr) 49 return 0; 50 51 mem->bus.is_iomem = false; 52 if (!bdev->funcs->io_mem_reserve) 53 return 0; 54 55 return bdev->funcs->io_mem_reserve(bdev, mem); 56} 57 58void ttm_mem_io_free(struct ttm_device *bdev, 59 struct ttm_resource *mem) 60{ 61 if (!mem) 62 return; 63 64 if (!mem->bus.offset && !mem->bus.addr) 65 return; 66 67 if (bdev->funcs->io_mem_free) 68 bdev->funcs->io_mem_free(bdev, mem); 69 70 mem->bus.offset = 0; 71 mem->bus.addr = NULL; 72} 73 74/** 75 * ttm_move_memcpy - Helper to perform a memcpy ttm move operation. 76 * @clear: Whether to clear rather than copy. 77 * @num_pages: Number of pages of the operation. 78 * @dst_iter: A struct ttm_kmap_iter representing the destination resource. 79 * @src_iter: A struct ttm_kmap_iter representing the source resource. 80 * 81 * This function is intended to be able to move out async under a 82 * dma-fence if desired. 83 */ 84void ttm_move_memcpy(bool clear, 85 u32 num_pages, 86 struct ttm_kmap_iter *dst_iter, 87 struct ttm_kmap_iter *src_iter) 88{ 89 const struct ttm_kmap_iter_ops *dst_ops = dst_iter->ops; 90 const struct ttm_kmap_iter_ops *src_ops = src_iter->ops; 91 struct iosys_map src_map, dst_map; 92 pgoff_t i; 93 94 /* Single TTM move. NOP */ 95 if (dst_ops->maps_tt && src_ops->maps_tt) 96 return; 97 98 /* Don't move nonexistent data. Clear destination instead. */ 99 if (clear) { 100 for (i = 0; i < num_pages; ++i) { 101 dst_ops->map_local(dst_iter, &dst_map, i); 102 if (dst_map.is_iomem) 103 memset_io(dst_map.vaddr_iomem, 0, PAGE_SIZE); 104 else 105 memset(dst_map.vaddr, 0, PAGE_SIZE); 106 if (dst_ops->unmap_local) 107 dst_ops->unmap_local(dst_iter, &dst_map); 108 } 109 return; 110 } 111 112 for (i = 0; i < num_pages; ++i) { 113 dst_ops->map_local(dst_iter, &dst_map, i); 114 src_ops->map_local(src_iter, &src_map, i); 115 116 drm_memcpy_from_wc(&dst_map, &src_map, PAGE_SIZE); 117 118 if (src_ops->unmap_local) 119 src_ops->unmap_local(src_iter, &src_map); 120 if (dst_ops->unmap_local) 121 dst_ops->unmap_local(dst_iter, &dst_map); 122 } 123} 124EXPORT_SYMBOL(ttm_move_memcpy); 125 126/** 127 * ttm_bo_move_memcpy 128 * 129 * @bo: A pointer to a struct ttm_buffer_object. 130 * @ctx: operation context 131 * @dst_mem: struct ttm_resource indicating where to move. 132 * 133 * Fallback move function for a mappable buffer object in mappable memory. 134 * The function will, if successful, 135 * free any old aperture space, and set (@new_mem)->mm_node to NULL, 136 * and update the (@bo)->mem placement flags. If unsuccessful, the old 137 * data remains untouched, and it's up to the caller to free the 138 * memory space indicated by @new_mem. 139 * Returns: 140 * !0: Failure. 141 */ 142int ttm_bo_move_memcpy(struct ttm_buffer_object *bo, 143 struct ttm_operation_ctx *ctx, 144 struct ttm_resource *dst_mem) 145{ 146 struct ttm_device *bdev = bo->bdev; 147 struct ttm_resource_manager *dst_man = 148 ttm_manager_type(bo->bdev, dst_mem->mem_type); 149 struct ttm_tt *ttm = bo->ttm; 150 struct ttm_resource *src_mem = bo->resource; 151 struct ttm_resource_manager *src_man; 152 union { 153 struct ttm_kmap_iter_tt tt; 154 struct ttm_kmap_iter_linear_io io; 155 } _dst_iter, _src_iter; 156 struct ttm_kmap_iter *dst_iter, *src_iter; 157 bool clear; 158 int ret = 0; 159 160 if (WARN_ON(!src_mem)) 161 return -EINVAL; 162 163 src_man = ttm_manager_type(bdev, src_mem->mem_type); 164 if (ttm && ((ttm->page_flags & TTM_TT_FLAG_SWAPPED) || 165 dst_man->use_tt)) { 166 ret = ttm_tt_populate(bdev, ttm, ctx); 167 if (ret) 168 return ret; 169 } 170 171 dst_iter = ttm_kmap_iter_linear_io_init(&_dst_iter.io, bdev, dst_mem); 172 if (PTR_ERR(dst_iter) == -EINVAL && dst_man->use_tt) 173 dst_iter = ttm_kmap_iter_tt_init(&_dst_iter.tt, bo->ttm); 174 if (IS_ERR(dst_iter)) 175 return PTR_ERR(dst_iter); 176 177 src_iter = ttm_kmap_iter_linear_io_init(&_src_iter.io, bdev, src_mem); 178 if (PTR_ERR(src_iter) == -EINVAL && src_man->use_tt) 179 src_iter = ttm_kmap_iter_tt_init(&_src_iter.tt, bo->ttm); 180 if (IS_ERR(src_iter)) { 181 ret = PTR_ERR(src_iter); 182 goto out_src_iter; 183 } 184 185 clear = src_iter->ops->maps_tt && (!ttm || !ttm_tt_is_populated(ttm)); 186 if (!(clear && ttm && !(ttm->page_flags & TTM_TT_FLAG_ZERO_ALLOC))) 187 ttm_move_memcpy(clear, PFN_UP(dst_mem->size), dst_iter, src_iter); 188 189 if (!src_iter->ops->maps_tt) 190 ttm_kmap_iter_linear_io_fini(&_src_iter.io, bdev, src_mem); 191 ttm_bo_move_sync_cleanup(bo, dst_mem); 192 193out_src_iter: 194 if (!dst_iter->ops->maps_tt) 195 ttm_kmap_iter_linear_io_fini(&_dst_iter.io, bdev, dst_mem); 196 197 return ret; 198} 199EXPORT_SYMBOL(ttm_bo_move_memcpy); 200 201static void ttm_transfered_destroy(struct ttm_buffer_object *bo) 202{ 203 struct ttm_transfer_obj *fbo; 204 205 fbo = container_of(bo, struct ttm_transfer_obj, base); 206 dma_resv_fini(&fbo->base.base._resv); 207 ttm_bo_put(fbo->bo); 208 kfree(fbo); 209} 210 211/** 212 * ttm_buffer_object_transfer 213 * 214 * @bo: A pointer to a struct ttm_buffer_object. 215 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object, 216 * holding the data of @bo with the old placement. 217 * 218 * This is a utility function that may be called after an accelerated move 219 * has been scheduled. A new buffer object is created as a placeholder for 220 * the old data while it's being copied. When that buffer object is idle, 221 * it can be destroyed, releasing the space of the old placement. 222 * Returns: 223 * !0: Failure. 224 */ 225 226static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo, 227 struct ttm_buffer_object **new_obj) 228{ 229 struct ttm_transfer_obj *fbo; 230 int ret; 231 232 fbo = kmalloc(sizeof(*fbo), GFP_KERNEL); 233 if (!fbo) 234 return -ENOMEM; 235 236 fbo->base = *bo; 237 238 /** 239 * Fix up members that we shouldn't copy directly: 240 * TODO: Explicit member copy would probably be better here. 241 */ 242 243 atomic_inc(&ttm_glob.bo_count); 244 drm_vma_node_reset(&fbo->base.base.vma_node); 245 246 kref_init(&fbo->base.kref); 247 fbo->base.destroy = &ttm_transfered_destroy; 248 fbo->base.pin_count = 0; 249 if (bo->type != ttm_bo_type_sg) 250 fbo->base.base.resv = &fbo->base.base._resv; 251 252 dma_resv_init(&fbo->base.base._resv); 253 fbo->base.base.dev = NULL; 254 ret = dma_resv_trylock(&fbo->base.base._resv); 255 WARN_ON(!ret); 256 257 if (fbo->base.resource) { 258 ttm_resource_set_bo(fbo->base.resource, &fbo->base); 259 bo->resource = NULL; 260 ttm_bo_set_bulk_move(&fbo->base, NULL); 261 } else { 262 fbo->base.bulk_move = NULL; 263 } 264 265 ret = dma_resv_reserve_fences(&fbo->base.base._resv, 1); 266 if (ret) { 267 kfree(fbo); 268 return ret; 269 } 270 271 ttm_bo_get(bo); 272 fbo->bo = bo; 273 274 ttm_bo_move_to_lru_tail_unlocked(&fbo->base); 275 276 *new_obj = &fbo->base; 277 return 0; 278} 279 280/** 281 * ttm_io_prot 282 * 283 * @bo: ttm buffer object 284 * @res: ttm resource object 285 * @tmp: Page protection flag for a normal, cached mapping. 286 * 287 * Utility function that returns the pgprot_t that should be used for 288 * setting up a PTE with the caching model indicated by @c_state. 289 */ 290pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res, 291 pgprot_t tmp) 292{ 293 struct ttm_resource_manager *man; 294 enum ttm_caching caching; 295 296 man = ttm_manager_type(bo->bdev, res->mem_type); 297 if (man->use_tt) { 298 caching = bo->ttm->caching; 299 if (bo->ttm->page_flags & TTM_TT_FLAG_DECRYPTED) 300 tmp = pgprot_decrypted(tmp); 301 } else { 302 caching = res->bus.caching; 303 } 304 305 return ttm_prot_from_caching(caching, tmp); 306} 307EXPORT_SYMBOL(ttm_io_prot); 308 309static int ttm_bo_ioremap(struct ttm_buffer_object *bo, 310 unsigned long offset, 311 unsigned long size, 312 struct ttm_bo_kmap_obj *map) 313{ 314 struct ttm_resource *mem = bo->resource; 315 316 if (bo->resource->bus.addr) { 317 map->bo_kmap_type = ttm_bo_map_premapped; 318 map->virtual = ((u8 *)bo->resource->bus.addr) + offset; 319 } else { 320 resource_size_t res = bo->resource->bus.offset + offset; 321 322 map->bo_kmap_type = ttm_bo_map_iomap; 323 if (mem->bus.caching == ttm_write_combined) 324 map->virtual = ioremap_wc(res, size); 325#ifdef CONFIG_X86 326 else if (mem->bus.caching == ttm_cached) 327 map->virtual = ioremap_cache(res, size); 328#endif 329 else 330 map->virtual = ioremap(res, size); 331 } 332 return (!map->virtual) ? -ENOMEM : 0; 333} 334 335static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo, 336 unsigned long start_page, 337 unsigned long num_pages, 338 struct ttm_bo_kmap_obj *map) 339{ 340 struct ttm_resource *mem = bo->resource; 341 struct ttm_operation_ctx ctx = { 342 .interruptible = false, 343 .no_wait_gpu = false 344 }; 345 struct ttm_tt *ttm = bo->ttm; 346 struct ttm_resource_manager *man = 347 ttm_manager_type(bo->bdev, bo->resource->mem_type); 348 pgprot_t prot; 349 int ret; 350 351 BUG_ON(!ttm); 352 353 ret = ttm_tt_populate(bo->bdev, ttm, &ctx); 354 if (ret) 355 return ret; 356 357 if (num_pages == 1 && ttm->caching == ttm_cached && 358 !(man->use_tt && (ttm->page_flags & TTM_TT_FLAG_DECRYPTED))) { 359 /* 360 * We're mapping a single page, and the desired 361 * page protection is consistent with the bo. 362 */ 363 364 map->bo_kmap_type = ttm_bo_map_kmap; 365 map->page = ttm->pages[start_page]; 366 map->virtual = kmap(map->page); 367 } else { 368 /* 369 * We need to use vmap to get the desired page protection 370 * or to make the buffer object look contiguous. 371 */ 372 prot = ttm_io_prot(bo, mem, PAGE_KERNEL); 373 map->bo_kmap_type = ttm_bo_map_vmap; 374 map->virtual = vmap(ttm->pages + start_page, num_pages, 375 0, prot); 376 } 377 return (!map->virtual) ? -ENOMEM : 0; 378} 379 380/** 381 * ttm_bo_kmap 382 * 383 * @bo: The buffer object. 384 * @start_page: The first page to map. 385 * @num_pages: Number of pages to map. 386 * @map: pointer to a struct ttm_bo_kmap_obj representing the map. 387 * 388 * Sets up a kernel virtual mapping, using ioremap, vmap or kmap to the 389 * data in the buffer object. The ttm_kmap_obj_virtual function can then be 390 * used to obtain a virtual address to the data. 391 * 392 * Returns 393 * -ENOMEM: Out of memory. 394 * -EINVAL: Invalid range. 395 */ 396int ttm_bo_kmap(struct ttm_buffer_object *bo, 397 unsigned long start_page, unsigned long num_pages, 398 struct ttm_bo_kmap_obj *map) 399{ 400 unsigned long offset, size; 401 int ret; 402 403 map->virtual = NULL; 404 map->bo = bo; 405 if (num_pages > PFN_UP(bo->resource->size)) 406 return -EINVAL; 407 if ((start_page + num_pages) > PFN_UP(bo->resource->size)) 408 return -EINVAL; 409 410 ret = ttm_mem_io_reserve(bo->bdev, bo->resource); 411 if (ret) 412 return ret; 413 if (!bo->resource->bus.is_iomem) { 414 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map); 415 } else { 416 offset = start_page << PAGE_SHIFT; 417 size = num_pages << PAGE_SHIFT; 418 return ttm_bo_ioremap(bo, offset, size, map); 419 } 420} 421EXPORT_SYMBOL(ttm_bo_kmap); 422 423/** 424 * ttm_bo_kunmap 425 * 426 * @map: Object describing the map to unmap. 427 * 428 * Unmaps a kernel map set up by ttm_bo_kmap. 429 */ 430void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map) 431{ 432 if (!map->virtual) 433 return; 434 switch (map->bo_kmap_type) { 435 case ttm_bo_map_iomap: 436 iounmap(map->virtual); 437 break; 438 case ttm_bo_map_vmap: 439 vunmap(map->virtual); 440 break; 441 case ttm_bo_map_kmap: 442 kunmap(map->page); 443 break; 444 case ttm_bo_map_premapped: 445 break; 446 default: 447 BUG(); 448 } 449 ttm_mem_io_free(map->bo->bdev, map->bo->resource); 450 map->virtual = NULL; 451 map->page = NULL; 452} 453EXPORT_SYMBOL(ttm_bo_kunmap); 454 455/** 456 * ttm_bo_vmap 457 * 458 * @bo: The buffer object. 459 * @map: pointer to a struct iosys_map representing the map. 460 * 461 * Sets up a kernel virtual mapping, using ioremap or vmap to the 462 * data in the buffer object. The parameter @map returns the virtual 463 * address as struct iosys_map. Unmap the buffer with ttm_bo_vunmap(). 464 * 465 * Returns 466 * -ENOMEM: Out of memory. 467 * -EINVAL: Invalid range. 468 */ 469int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map) 470{ 471 struct ttm_resource *mem = bo->resource; 472 int ret; 473 474 dma_resv_assert_held(bo->base.resv); 475 476 ret = ttm_mem_io_reserve(bo->bdev, mem); 477 if (ret) 478 return ret; 479 480 if (mem->bus.is_iomem) { 481 void __iomem *vaddr_iomem; 482 483 if (mem->bus.addr) 484 vaddr_iomem = (void __iomem *)mem->bus.addr; 485 else if (mem->bus.caching == ttm_write_combined) 486 vaddr_iomem = ioremap_wc(mem->bus.offset, 487 bo->base.size); 488#ifdef CONFIG_X86 489 else if (mem->bus.caching == ttm_cached) 490 vaddr_iomem = ioremap_cache(mem->bus.offset, 491 bo->base.size); 492#endif 493 else 494 vaddr_iomem = ioremap(mem->bus.offset, bo->base.size); 495 496 if (!vaddr_iomem) 497 return -ENOMEM; 498 499 iosys_map_set_vaddr_iomem(map, vaddr_iomem); 500 501 } else { 502 struct ttm_operation_ctx ctx = { 503 .interruptible = false, 504 .no_wait_gpu = false 505 }; 506 struct ttm_tt *ttm = bo->ttm; 507 pgprot_t prot; 508 void *vaddr; 509 510 ret = ttm_tt_populate(bo->bdev, ttm, &ctx); 511 if (ret) 512 return ret; 513 514 /* 515 * We need to use vmap to get the desired page protection 516 * or to make the buffer object look contiguous. 517 */ 518 prot = ttm_io_prot(bo, mem, PAGE_KERNEL); 519 vaddr = vmap(ttm->pages, ttm->num_pages, 0, prot); 520 if (!vaddr) 521 return -ENOMEM; 522 523 iosys_map_set_vaddr(map, vaddr); 524 } 525 526 return 0; 527} 528EXPORT_SYMBOL(ttm_bo_vmap); 529 530/** 531 * ttm_bo_vunmap 532 * 533 * @bo: The buffer object. 534 * @map: Object describing the map to unmap. 535 * 536 * Unmaps a kernel map set up by ttm_bo_vmap(). 537 */ 538void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct iosys_map *map) 539{ 540 struct ttm_resource *mem = bo->resource; 541 542 dma_resv_assert_held(bo->base.resv); 543 544 if (iosys_map_is_null(map)) 545 return; 546 547 if (!map->is_iomem) 548 vunmap(map->vaddr); 549 else if (!mem->bus.addr) 550 iounmap(map->vaddr_iomem); 551 iosys_map_clear(map); 552 553 ttm_mem_io_free(bo->bdev, bo->resource); 554} 555EXPORT_SYMBOL(ttm_bo_vunmap); 556 557static int ttm_bo_wait_free_node(struct ttm_buffer_object *bo, 558 bool dst_use_tt) 559{ 560 long ret; 561 562 ret = dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_BOOKKEEP, 563 false, 15 * HZ); 564 if (ret == 0) 565 return -EBUSY; 566 if (ret < 0) 567 return ret; 568 569 if (!dst_use_tt) 570 ttm_bo_tt_destroy(bo); 571 ttm_resource_free(bo, &bo->resource); 572 return 0; 573} 574 575static int ttm_bo_move_to_ghost(struct ttm_buffer_object *bo, 576 struct dma_fence *fence, 577 bool dst_use_tt) 578{ 579 struct ttm_buffer_object *ghost_obj; 580 int ret; 581 582 /** 583 * This should help pipeline ordinary buffer moves. 584 * 585 * Hang old buffer memory on a new buffer object, 586 * and leave it to be released when the GPU 587 * operation has completed. 588 */ 589 590 ret = ttm_buffer_object_transfer(bo, &ghost_obj); 591 if (ret) 592 return ret; 593 594 dma_resv_add_fence(&ghost_obj->base._resv, fence, 595 DMA_RESV_USAGE_KERNEL); 596 597 /** 598 * If we're not moving to fixed memory, the TTM object 599 * needs to stay alive. Otherwhise hang it on the ghost 600 * bo to be unbound and destroyed. 601 */ 602 603 if (dst_use_tt) 604 ghost_obj->ttm = NULL; 605 else 606 bo->ttm = NULL; 607 608 dma_resv_unlock(&ghost_obj->base._resv); 609 ttm_bo_put(ghost_obj); 610 return 0; 611} 612 613static void ttm_bo_move_pipeline_evict(struct ttm_buffer_object *bo, 614 struct dma_fence *fence) 615{ 616 struct ttm_device *bdev = bo->bdev; 617 struct ttm_resource_manager *from; 618 619 from = ttm_manager_type(bdev, bo->resource->mem_type); 620 621 /** 622 * BO doesn't have a TTM we need to bind/unbind. Just remember 623 * this eviction and free up the allocation 624 */ 625 spin_lock(&from->move_lock); 626 if (!from->move || dma_fence_is_later(fence, from->move)) { 627 dma_fence_put(from->move); 628 from->move = dma_fence_get(fence); 629 } 630 spin_unlock(&from->move_lock); 631 632 ttm_resource_free(bo, &bo->resource); 633} 634 635/** 636 * ttm_bo_move_accel_cleanup - cleanup helper for hw copies 637 * 638 * @bo: A pointer to a struct ttm_buffer_object. 639 * @fence: A fence object that signals when moving is complete. 640 * @evict: This is an evict move. Don't return until the buffer is idle. 641 * @pipeline: evictions are to be pipelined. 642 * @new_mem: struct ttm_resource indicating where to move. 643 * 644 * Accelerated move function to be called when an accelerated move 645 * has been scheduled. The function will create a new temporary buffer object 646 * representing the old placement, and put the sync object on both buffer 647 * objects. After that the newly created buffer object is unref'd to be 648 * destroyed when the move is complete. This will help pipeline 649 * buffer moves. 650 */ 651int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo, 652 struct dma_fence *fence, 653 bool evict, 654 bool pipeline, 655 struct ttm_resource *new_mem) 656{ 657 struct ttm_device *bdev = bo->bdev; 658 struct ttm_resource_manager *from = ttm_manager_type(bdev, bo->resource->mem_type); 659 struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type); 660 int ret = 0; 661 662 dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_KERNEL); 663 if (!evict) 664 ret = ttm_bo_move_to_ghost(bo, fence, man->use_tt); 665 else if (!from->use_tt && pipeline) 666 ttm_bo_move_pipeline_evict(bo, fence); 667 else 668 ret = ttm_bo_wait_free_node(bo, man->use_tt); 669 670 if (ret) 671 return ret; 672 673 ttm_bo_assign_mem(bo, new_mem); 674 675 return 0; 676} 677EXPORT_SYMBOL(ttm_bo_move_accel_cleanup); 678 679/** 680 * ttm_bo_move_sync_cleanup - cleanup by waiting for the move to finish 681 * 682 * @bo: A pointer to a struct ttm_buffer_object. 683 * @new_mem: struct ttm_resource indicating where to move. 684 * 685 * Special case of ttm_bo_move_accel_cleanup where the bo is guaranteed 686 * by the caller to be idle. Typically used after memcpy buffer moves. 687 */ 688void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo, 689 struct ttm_resource *new_mem) 690{ 691 struct ttm_device *bdev = bo->bdev; 692 struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type); 693 int ret; 694 695 ret = ttm_bo_wait_free_node(bo, man->use_tt); 696 if (WARN_ON(ret)) 697 return; 698 699 ttm_bo_assign_mem(bo, new_mem); 700} 701EXPORT_SYMBOL(ttm_bo_move_sync_cleanup); 702 703/** 704 * ttm_bo_pipeline_gutting - purge the contents of a bo 705 * @bo: The buffer object 706 * 707 * Purge the contents of a bo, async if the bo is not idle. 708 * After a successful call, the bo is left unpopulated in 709 * system placement. The function may wait uninterruptible 710 * for idle on OOM. 711 * 712 * Return: 0 if successful, negative error code on failure. 713 */ 714int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo) 715{ 716 struct ttm_buffer_object *ghost; 717 struct ttm_tt *ttm; 718 int ret; 719 720 /* If already idle, no need for ghost object dance. */ 721 if (dma_resv_test_signaled(bo->base.resv, DMA_RESV_USAGE_BOOKKEEP)) { 722 if (!bo->ttm) { 723 /* See comment below about clearing. */ 724 ret = ttm_tt_create(bo, true); 725 if (ret) 726 return ret; 727 } else { 728 ttm_tt_unpopulate(bo->bdev, bo->ttm); 729 if (bo->type == ttm_bo_type_device) 730 ttm_tt_mark_for_clear(bo->ttm); 731 } 732 ttm_resource_free(bo, &bo->resource); 733 return 0; 734 } 735 736 /* 737 * We need an unpopulated ttm_tt after giving our current one, 738 * if any, to the ghost object. And we can't afford to fail 739 * creating one *after* the operation. If the bo subsequently gets 740 * resurrected, make sure it's cleared (if ttm_bo_type_device) 741 * to avoid leaking sensitive information to user-space. 742 */ 743 744 ttm = bo->ttm; 745 bo->ttm = NULL; 746 ret = ttm_tt_create(bo, true); 747 swap(bo->ttm, ttm); 748 if (ret) 749 return ret; 750 751 ret = ttm_buffer_object_transfer(bo, &ghost); 752 if (ret) 753 goto error_destroy_tt; 754 755 ret = dma_resv_copy_fences(&ghost->base._resv, bo->base.resv); 756 /* Last resort, wait for the BO to be idle when we are OOM */ 757 if (ret) { 758 dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_BOOKKEEP, 759 false, MAX_SCHEDULE_TIMEOUT); 760 } 761 762 dma_resv_unlock(&ghost->base._resv); 763 ttm_bo_put(ghost); 764 bo->ttm = ttm; 765 return 0; 766 767error_destroy_tt: 768 ttm_tt_destroy(bo->bdev, ttm); 769 return ret; 770} 771