drivers/gpu/drm/ttm/ttm_bo_util.c

   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 <drm/ttm/ttm_bo_driver.h>
  33 #include <drm/ttm/ttm_placement.h>
  34 #include <drm/drm_vma_manager.h>
  35 #include <linux/dma-buf-map.h>
  36 #include <linux/io.h>
  37 #include <linux/highmem.h>
  38 #include <linux/wait.h>
  39 #include <linux/slab.h>
  40 #include <linux/vmalloc.h>
  41 #include <linux/module.h>
  42 #include <linux/dma-resv.h>
  43
  44 struct ttm_transfer_obj {
  45         struct ttm_buffer_object base;
  46         struct ttm_buffer_object *bo;
  47 };
  48
  49 int ttm_mem_io_reserve(struct ttm_device *bdev,
  50                        struct ttm_resource *mem)
  51 {
  52         if (mem->bus.offset || mem->bus.addr)
  53                 return 0;
  54
  55         mem->bus.is_iomem = false;
  56         if (!bdev->funcs->io_mem_reserve)
  57                 return 0;
  58
  59         return bdev->funcs->io_mem_reserve(bdev, mem);
  60 }
  61
  62 void ttm_mem_io_free(struct ttm_device *bdev,
  63                      struct ttm_resource *mem)
  64 {
  65         if (!mem->bus.offset && !mem->bus.addr)
  66                 return;
  67
  68         if (bdev->funcs->io_mem_free)
  69                 bdev->funcs->io_mem_free(bdev, mem);
  70
  71         mem->bus.offset = 0;
  72         mem->bus.addr = NULL;
  73 }
  74
  75 static int ttm_resource_ioremap(struct ttm_device *bdev,
  76                                struct ttm_resource *mem,
  77                                void **virtual)
  78 {
  79         int ret;
  80         void *addr;
  81
  82         *virtual = NULL;
  83         ret = ttm_mem_io_reserve(bdev, mem);
  84         if (ret || !mem->bus.is_iomem)
  85                 return ret;
  86
  87         if (mem->bus.addr) {
  88                 addr = mem->bus.addr;
  89         } else {
  90                 size_t bus_size = (size_t)mem->num_pages << PAGE_SHIFT;
  91
  92                 if (mem->bus.caching == ttm_write_combined)
  93                         addr = ioremap_wc(mem->bus.offset, bus_size);
  94 #ifdef CONFIG_X86
  95                 else if (mem->bus.caching == ttm_cached)
  96                         addr = ioremap_cache(mem->bus.offset, bus_size);
  97 #endif
  98                 else
  99                         addr = ioremap(mem->bus.offset, bus_size);
 100                 if (!addr) {
 101                         ttm_mem_io_free(bdev, mem);
 102                         return -ENOMEM;
 103                 }
 104         }
 105         *virtual = addr;
 106         return 0;
 107 }
 108
 109 static void ttm_resource_iounmap(struct ttm_device *bdev,
 110                                 struct ttm_resource *mem,
 111                                 void *virtual)
 112 {
 113         if (virtual && mem->bus.addr == NULL)
 114                 iounmap(virtual);
 115         ttm_mem_io_free(bdev, mem);
 116 }
 117
 118 static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
 119 {
 120         uint32_t *dstP =
 121             (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
 122         uint32_t *srcP =
 123             (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
 124
 125         int i;
 126         for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
 127                 iowrite32(ioread32(srcP++), dstP++);
 128         return 0;
 129 }
 130
 131 static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
 132                                 unsigned long page,
 133                                 pgprot_t prot)
 134 {
 135         struct page *d = ttm->pages[page];
 136         void *dst;
 137
 138         if (!d)
 139                 return -ENOMEM;
 140
 141         src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
 142         dst = kmap_atomic_prot(d, prot);
 143         if (!dst)
 144                 return -ENOMEM;
 145
 146         memcpy_fromio(dst, src, PAGE_SIZE);
 147
 148         kunmap_atomic(dst);
 149
 150         return 0;
 151 }
 152
 153 static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
 154                                 unsigned long page,
 155                                 pgprot_t prot)
 156 {
 157         struct page *s = ttm->pages[page];
 158         void *src;
 159
 160         if (!s)
 161                 return -ENOMEM;
 162
 163         dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
 164         src = kmap_atomic_prot(s, prot);
 165         if (!src)
 166                 return -ENOMEM;
 167
 168         memcpy_toio(dst, src, PAGE_SIZE);
 169
 170         kunmap_atomic(src);
 171
 172         return 0;
 173 }
 174
 175 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 176                        struct ttm_operation_ctx *ctx,
 177                        struct ttm_resource *new_mem)
 178 {
 179         struct ttm_device *bdev = bo->bdev;
 180         struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type);
 181         struct ttm_tt *ttm = bo->ttm;
 182         struct ttm_resource *old_mem = &bo->mem;
 183         struct ttm_resource old_copy = *old_mem;
 184         void *old_iomap;
 185         void *new_iomap;
 186         int ret;
 187         unsigned long i;
 188
 189         ret = ttm_bo_wait_ctx(bo, ctx);
 190         if (ret)
 191                 return ret;
 192
 193         ret = ttm_resource_ioremap(bdev, old_mem, &old_iomap);
 194         if (ret)
 195                 return ret;
 196         ret = ttm_resource_ioremap(bdev, new_mem, &new_iomap);
 197         if (ret)
 198                 goto out;
 199
 200         /*
 201          * Single TTM move. NOP.
 202          */
 203         if (old_iomap == NULL && new_iomap == NULL)
 204                 goto out2;
 205
 206         /*
 207          * Don't move nonexistent data. Clear destination instead.
 208          */
 209         if (old_iomap == NULL &&
 210             (ttm == NULL || (!ttm_tt_is_populated(ttm) &&
 211                              !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
 212                 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
 213                 goto out2;
 214         }
 215
 216         /*
 217          * TTM might be null for moves within the same region.
 218          */
 219         if (ttm) {
 220                 ret = ttm_tt_populate(bdev, ttm, ctx);
 221                 if (ret)
 222                         goto out1;
 223         }
 224
 225         for (i = 0; i < new_mem->num_pages; ++i) {
 226                 if (old_iomap == NULL) {
 227                         pgprot_t prot = ttm_io_prot(bo, old_mem, PAGE_KERNEL);
 228                         ret = ttm_copy_ttm_io_page(ttm, new_iomap, i,
 229                                                    prot);
 230                 } else if (new_iomap == NULL) {
 231                         pgprot_t prot = ttm_io_prot(bo, new_mem, PAGE_KERNEL);
 232                         ret = ttm_copy_io_ttm_page(ttm, old_iomap, i,
 233                                                    prot);
 234                 } else {
 235                         ret = ttm_copy_io_page(new_iomap, old_iomap, i);
 236                 }
 237                 if (ret)
 238                         goto out1;
 239         }
 240         mb();
 241 out2:
 242         old_copy = *old_mem;
 243
 244         ttm_bo_assign_mem(bo, new_mem);
 245
 246         if (!man->use_tt)
 247                 ttm_bo_tt_destroy(bo);
 248
 249 out1:
 250         ttm_resource_iounmap(bdev, old_mem, new_iomap);
 251 out:
 252         ttm_resource_iounmap(bdev, &old_copy, old_iomap);
 253
 254         /*
 255          * On error, keep the mm node!
 256          */
 257         if (!ret)
 258                 ttm_resource_free(bo, &old_copy);
 259         return ret;
 260 }
 261 EXPORT_SYMBOL(ttm_bo_move_memcpy);
 262
 263 static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
 264 {
 265         struct ttm_transfer_obj *fbo;
 266
 267         fbo = container_of(bo, struct ttm_transfer_obj, base);
 268         ttm_bo_put(fbo->bo);
 269         kfree(fbo);
 270 }
 271
 272 /**
 273  * ttm_buffer_object_transfer
 274  *
 275  * @bo: A pointer to a struct ttm_buffer_object.
 276  * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
 277  * holding the data of @bo with the old placement.
 278  *
 279  * This is a utility function that may be called after an accelerated move
 280  * has been scheduled. A new buffer object is created as a placeholder for
 281  * the old data while it's being copied. When that buffer object is idle,
 282  * it can be destroyed, releasing the space of the old placement.
 283  * Returns:
 284  * !0: Failure.
 285  */
 286
 287 static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 288                                       struct ttm_buffer_object **new_obj)
 289 {
 290         struct ttm_transfer_obj *fbo;
 291         int ret;
 292
 293         fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
 294         if (!fbo)
 295                 return -ENOMEM;
 296
 297         fbo->base = *bo;
 298
 299         ttm_bo_get(bo);
 300         fbo->bo = bo;
 301
 302         /**
 303          * Fix up members that we shouldn't copy directly:
 304          * TODO: Explicit member copy would probably be better here.
 305          */
 306
 307         atomic_inc(&ttm_glob.bo_count);
 308         INIT_LIST_HEAD(&fbo->base.ddestroy);
 309         INIT_LIST_HEAD(&fbo->base.lru);
 310         fbo->base.moving = NULL;
 311         drm_vma_node_reset(&fbo->base.base.vma_node);
 312
 313         kref_init(&fbo->base.kref);
 314         fbo->base.destroy = &ttm_transfered_destroy;
 315         fbo->base.pin_count = 0;
 316         if (bo->type != ttm_bo_type_sg)
 317                 fbo->base.base.resv = &fbo->base.base._resv;
 318
 319         dma_resv_init(&fbo->base.base._resv);
 320         fbo->base.base.dev = NULL;
 321         ret = dma_resv_trylock(&fbo->base.base._resv);
 322         WARN_ON(!ret);
 323
 324         ttm_bo_move_to_lru_tail_unlocked(&fbo->base);
 325
 326         *new_obj = &fbo->base;
 327         return 0;
 328 }
 329
 330 pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
 331                      pgprot_t tmp)
 332 {
 333         struct ttm_resource_manager *man;
 334         enum ttm_caching caching;
 335
 336         man = ttm_manager_type(bo->bdev, res->mem_type);
 337         caching = man->use_tt ? bo->ttm->caching : res->bus.caching;
 338
 339         /* Cached mappings need no adjustment */
 340         if (caching == ttm_cached)
 341                 return tmp;
 342
 343 #if defined(__i386__) || defined(__x86_64__)
 344         if (caching == ttm_write_combined)
 345                 tmp = pgprot_writecombine(tmp);
 346         else if (boot_cpu_data.x86 > 3)
 347                 tmp = pgprot_noncached(tmp);
 348 #endif
 349 #if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
 350     defined(__powerpc__) || defined(__mips__)
 351         if (caching == ttm_write_combined)
 352                 tmp = pgprot_writecombine(tmp);
 353         else
 354                 tmp = pgprot_noncached(tmp);
 355 #endif
 356 #if defined(__sparc__)
 357         tmp = pgprot_noncached(tmp);
 358 #endif
 359         return tmp;
 360 }
 361 EXPORT_SYMBOL(ttm_io_prot);
 362
 363 static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
 364                           unsigned long offset,
 365                           unsigned long size,
 366                           struct ttm_bo_kmap_obj *map)
 367 {
 368         struct ttm_resource *mem = &bo->mem;
 369
 370         if (bo->mem.bus.addr) {
 371                 map->bo_kmap_type = ttm_bo_map_premapped;
 372                 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
 373         } else {
 374                 map->bo_kmap_type = ttm_bo_map_iomap;
 375                 if (mem->bus.caching == ttm_write_combined)
 376                         map->virtual = ioremap_wc(bo->mem.bus.offset + offset,
 377                                                   size);
 378 #ifdef CONFIG_X86
 379                 else if (mem->bus.caching == ttm_cached)
 380                         map->virtual = ioremap_cache(bo->mem.bus.offset + offset,
 381                                                   size);
 382 #endif
 383                 else
 384                         map->virtual = ioremap(bo->mem.bus.offset + offset,
 385                                                size);
 386         }
 387         return (!map->virtual) ? -ENOMEM : 0;
 388 }
 389
 390 static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 391                            unsigned long start_page,
 392                            unsigned long num_pages,
 393                            struct ttm_bo_kmap_obj *map)
 394 {
 395         struct ttm_resource *mem = &bo->mem;
 396         struct ttm_operation_ctx ctx = {
 397                 .interruptible = false,
 398                 .no_wait_gpu = false
 399         };
 400         struct ttm_tt *ttm = bo->ttm;
 401         pgprot_t prot;
 402         int ret;
 403
 404         BUG_ON(!ttm);
 405
 406         ret = ttm_tt_populate(bo->bdev, ttm, &ctx);
 407         if (ret)
 408                 return ret;
 409
 410         if (num_pages == 1 && ttm->caching == ttm_cached) {
 411                 /*
 412                  * We're mapping a single page, and the desired
 413                  * page protection is consistent with the bo.
 414                  */
 415
 416                 map->bo_kmap_type = ttm_bo_map_kmap;
 417                 map->page = ttm->pages[start_page];
 418                 map->virtual = kmap(map->page);
 419         } else {
 420                 /*
 421                  * We need to use vmap to get the desired page protection
 422                  * or to make the buffer object look contiguous.
 423                  */
 424                 prot = ttm_io_prot(bo, mem, PAGE_KERNEL);
 425                 map->bo_kmap_type = ttm_bo_map_vmap;
 426                 map->virtual = vmap(ttm->pages + start_page, num_pages,
 427                                     0, prot);
 428         }
 429         return (!map->virtual) ? -ENOMEM : 0;
 430 }
 431
 432 int ttm_bo_kmap(struct ttm_buffer_object *bo,
 433                 unsigned long start_page, unsigned long num_pages,
 434                 struct ttm_bo_kmap_obj *map)
 435 {
 436         unsigned long offset, size;
 437         int ret;
 438
 439         map->virtual = NULL;
 440         map->bo = bo;
 441         if (num_pages > bo->mem.num_pages)
 442                 return -EINVAL;
 443         if ((start_page + num_pages) > bo->mem.num_pages)
 444                 return -EINVAL;
 445
 446         ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
 447         if (ret)
 448                 return ret;
 449         if (!bo->mem.bus.is_iomem) {
 450                 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
 451         } else {
 452                 offset = start_page << PAGE_SHIFT;
 453                 size = num_pages << PAGE_SHIFT;
 454                 return ttm_bo_ioremap(bo, offset, size, map);
 455         }
 456 }
 457 EXPORT_SYMBOL(ttm_bo_kmap);
 458
 459 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
 460 {
 461         if (!map->virtual)
 462                 return;
 463         switch (map->bo_kmap_type) {
 464         case ttm_bo_map_iomap:
 465                 iounmap(map->virtual);
 466                 break;
 467         case ttm_bo_map_vmap:
 468                 vunmap(map->virtual);
 469                 break;
 470         case ttm_bo_map_kmap:
 471                 kunmap(map->page);
 472                 break;
 473         case ttm_bo_map_premapped:
 474                 break;
 475         default:
 476                 BUG();
 477         }
 478         ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
 479         map->virtual = NULL;
 480         map->page = NULL;
 481 }
 482 EXPORT_SYMBOL(ttm_bo_kunmap);
 483
 484 int ttm_bo_vmap(struct ttm_buffer_object *bo, struct dma_buf_map *map)
 485 {
 486         struct ttm_resource *mem = &bo->mem;
 487         int ret;
 488
 489         ret = ttm_mem_io_reserve(bo->bdev, mem);
 490         if (ret)
 491                 return ret;
 492
 493         if (mem->bus.is_iomem) {
 494                 void __iomem *vaddr_iomem;
 495
 496                 if (mem->bus.addr)
 497                         vaddr_iomem = (void __iomem *)mem->bus.addr;
 498                 else if (mem->bus.caching == ttm_write_combined)
 499                         vaddr_iomem = ioremap_wc(mem->bus.offset,
 500                                                  bo->base.size);
 501 #ifdef CONFIG_X86
 502                 else if (mem->bus.caching == ttm_cached)
 503                         vaddr_iomem = ioremap_cache(mem->bus.offset,
 504                                                   bo->base.size);
 505 #endif
 506                 else
 507                         vaddr_iomem = ioremap(mem->bus.offset, bo->base.size);
 508
 509                 if (!vaddr_iomem)
 510                         return -ENOMEM;
 511
 512                 dma_buf_map_set_vaddr_iomem(map, vaddr_iomem);
 513
 514         } else {
 515                 struct ttm_operation_ctx ctx = {
 516                         .interruptible = false,
 517                         .no_wait_gpu = false
 518                 };
 519                 struct ttm_tt *ttm = bo->ttm;
 520                 pgprot_t prot;
 521                 void *vaddr;
 522
 523                 ret = ttm_tt_populate(bo->bdev, ttm, &ctx);
 524                 if (ret)
 525                         return ret;
 526
 527                 /*
 528                  * We need to use vmap to get the desired page protection
 529                  * or to make the buffer object look contiguous.
 530                  */
 531                 prot = ttm_io_prot(bo, mem, PAGE_KERNEL);
 532                 vaddr = vmap(ttm->pages, ttm->num_pages, 0, prot);
 533                 if (!vaddr)
 534                         return -ENOMEM;
 535
 536                 dma_buf_map_set_vaddr(map, vaddr);
 537         }
 538
 539         return 0;
 540 }
 541 EXPORT_SYMBOL(ttm_bo_vmap);
 542
 543 void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct dma_buf_map *map)
 544 {
 545         struct ttm_resource *mem = &bo->mem;
 546
 547         if (dma_buf_map_is_null(map))
 548                 return;
 549
 550         if (!map->is_iomem)
 551                 vunmap(map->vaddr);
 552         else if (!mem->bus.addr)
 553                 iounmap(map->vaddr_iomem);
 554         dma_buf_map_clear(map);
 555
 556         ttm_mem_io_free(bo->bdev, &bo->mem);
 557 }
 558 EXPORT_SYMBOL(ttm_bo_vunmap);
 559
 560 static int ttm_bo_wait_free_node(struct ttm_buffer_object *bo,
 561                                  bool dst_use_tt)
 562 {
 563         int ret;
 564         ret = ttm_bo_wait(bo, false, false);
 565         if (ret)
 566                 return ret;
 567
 568         if (!dst_use_tt)
 569                 ttm_bo_tt_destroy(bo);
 570         ttm_resource_free(bo, &bo->mem);
 571         return 0;
 572 }
 573
 574 static int ttm_bo_move_to_ghost(struct ttm_buffer_object *bo,
 575                                 struct dma_fence *fence,
 576                                 bool dst_use_tt)
 577 {
 578         struct ttm_buffer_object *ghost_obj;
 579         int ret;
 580
 581         /**
 582          * This should help pipeline ordinary buffer moves.
 583          *
 584          * Hang old buffer memory on a new buffer object,
 585          * and leave it to be released when the GPU
 586          * operation has completed.
 587          */
 588
 589         dma_fence_put(bo->moving);
 590         bo->moving = dma_fence_get(fence);
 591
 592         ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 593         if (ret)
 594                 return ret;
 595
 596         dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
 597
 598         /**
 599          * If we're not moving to fixed memory, the TTM object
 600          * needs to stay alive. Otherwhise hang it on the ghost
 601          * bo to be unbound and destroyed.
 602          */
 603
 604         if (dst_use_tt)
 605                 ghost_obj->ttm = NULL;
 606         else
 607                 bo->ttm = NULL;
 608
 609         dma_resv_unlock(&ghost_obj->base._resv);
 610         ttm_bo_put(ghost_obj);
 611         return 0;
 612 }
 613
 614 static void ttm_bo_move_pipeline_evict(struct ttm_buffer_object *bo,
 615                                        struct dma_fence *fence)
 616 {
 617         struct ttm_device *bdev = bo->bdev;
 618         struct ttm_resource_manager *from = ttm_manager_type(bdev, bo->mem.mem_type);
 619
 620         /**
 621          * BO doesn't have a TTM we need to bind/unbind. Just remember
 622          * this eviction and free up the allocation
 623          */
 624         spin_lock(&from->move_lock);
 625         if (!from->move || dma_fence_is_later(fence, from->move)) {
 626                 dma_fence_put(from->move);
 627                 from->move = dma_fence_get(fence);
 628         }
 629         spin_unlock(&from->move_lock);
 630
 631         ttm_resource_free(bo, &bo->mem);
 632
 633         dma_fence_put(bo->moving);
 634         bo->moving = dma_fence_get(fence);
 635 }
 636
 637 int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
 638                               struct dma_fence *fence,
 639                               bool evict,
 640                               bool pipeline,
 641                               struct ttm_resource *new_mem)
 642 {
 643         struct ttm_device *bdev = bo->bdev;
 644         struct ttm_resource_manager *from = ttm_manager_type(bdev, bo->mem.mem_type);
 645         struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type);
 646         int ret = 0;
 647
 648         dma_resv_add_excl_fence(bo->base.resv, fence);
 649         if (!evict)
 650                 ret = ttm_bo_move_to_ghost(bo, fence, man->use_tt);
 651         else if (!from->use_tt && pipeline)
 652                 ttm_bo_move_pipeline_evict(bo, fence);
 653         else
 654                 ret = ttm_bo_wait_free_node(bo, man->use_tt);
 655
 656         if (ret)
 657                 return ret;
 658
 659         ttm_bo_assign_mem(bo, new_mem);
 660
 661         return 0;
 662 }
 663 EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
 664
 665 int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
 666 {
 667         struct ttm_buffer_object *ghost;
 668         int ret;
 669
 670         ret = ttm_buffer_object_transfer(bo, &ghost);
 671         if (ret)
 672                 return ret;
 673
 674         ret = dma_resv_copy_fences(&ghost->base._resv, bo->base.resv);
 675         /* Last resort, wait for the BO to be idle when we are OOM */
 676         if (ret)
 677                 ttm_bo_wait(bo, false, false);
 678
 679         memset(&bo->mem, 0, sizeof(bo->mem));
 680         bo->mem.mem_type = TTM_PL_SYSTEM;
 681         bo->ttm = NULL;
 682
 683         dma_resv_unlock(&ghost->base._resv);
 684         ttm_bo_put(ghost);
 685
 686         return 0;
 687 }