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/io.h>
  36 #include <linux/highmem.h>
  37 #include <linux/wait.h>
  38 #include <linux/slab.h>
  39 #include <linux/vmalloc.h>
  40 #include <linux/module.h>
  41 #include <linux/dma-resv.h>
  42
  43 struct ttm_transfer_obj {
  44         struct ttm_buffer_object base;
  45         struct ttm_buffer_object *bo;
  46 };
  47
  48 void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
  49 {
  50         ttm_resource_free(bo, &bo->mem);
  51 }
  52
  53 int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
  54                    struct ttm_operation_ctx *ctx,
  55                     struct ttm_resource *new_mem)
  56 {
  57         struct ttm_tt *ttm = bo->ttm;
  58         struct ttm_resource *old_mem = &bo->mem;
  59         int ret;
  60
  61         if (old_mem->mem_type != TTM_PL_SYSTEM) {
  62                 ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
  63
  64                 if (unlikely(ret != 0)) {
  65                         if (ret != -ERESTARTSYS)
  66                                 pr_err("Failed to expire sync object before unbinding TTM\n");
  67                         return ret;
  68                 }
  69
  70                 ttm_tt_unbind(ttm);
  71                 ttm_bo_free_old_node(bo);
  72                 ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
  73                                 TTM_PL_MASK_MEM);
  74                 old_mem->mem_type = TTM_PL_SYSTEM;
  75         }
  76
  77         ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
  78         if (unlikely(ret != 0))
  79                 return ret;
  80
  81         if (new_mem->mem_type != TTM_PL_SYSTEM) {
  82                 ret = ttm_tt_bind(ttm, new_mem, ctx);
  83                 if (unlikely(ret != 0))
  84                         return ret;
  85         }
  86
  87         *old_mem = *new_mem;
  88         new_mem->mm_node = NULL;
  89
  90         return 0;
  91 }
  92 EXPORT_SYMBOL(ttm_bo_move_ttm);
  93
  94 int ttm_mem_io_lock(struct ttm_resource_manager *man, bool interruptible)
  95 {
  96         if (likely(!man->use_io_reserve_lru))
  97                 return 0;
  98
  99         if (interruptible)
 100                 return mutex_lock_interruptible(&man->io_reserve_mutex);
 101
 102         mutex_lock(&man->io_reserve_mutex);
 103         return 0;
 104 }
 105
 106 void ttm_mem_io_unlock(struct ttm_resource_manager *man)
 107 {
 108         if (likely(!man->use_io_reserve_lru))
 109                 return;
 110
 111         mutex_unlock(&man->io_reserve_mutex);
 112 }
 113
 114 static int ttm_mem_io_evict(struct ttm_resource_manager *man)
 115 {
 116         struct ttm_buffer_object *bo;
 117
 118         bo = list_first_entry_or_null(&man->io_reserve_lru,
 119                                       struct ttm_buffer_object,
 120                                       io_reserve_lru);
 121         if (!bo)
 122                 return -ENOSPC;
 123
 124         list_del_init(&bo->io_reserve_lru);
 125         ttm_bo_unmap_virtual_locked(bo);
 126         return 0;
 127 }
 128
 129 int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
 130                        struct ttm_resource *mem)
 131 {
 132         struct ttm_resource_manager *man = ttm_manager_type(bdev, mem->mem_type);
 133         int ret;
 134
 135         if (mem->bus.io_reserved_count++)
 136                 return 0;
 137
 138         if (!bdev->driver->io_mem_reserve)
 139                 return 0;
 140
 141 retry:
 142         ret = bdev->driver->io_mem_reserve(bdev, mem);
 143         if (ret == -ENOSPC) {
 144                 ret = ttm_mem_io_evict(man);
 145                 if (ret == 0)
 146                         goto retry;
 147         }
 148         return ret;
 149 }
 150
 151 void ttm_mem_io_free(struct ttm_bo_device *bdev,
 152                      struct ttm_resource *mem)
 153 {
 154         if (--mem->bus.io_reserved_count)
 155                 return;
 156
 157         if (!bdev->driver->io_mem_free)
 158                 return;
 159
 160         bdev->driver->io_mem_free(bdev, mem);
 161 }
 162
 163 int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
 164 {
 165         struct ttm_resource_manager *man = ttm_manager_type(bo->bdev, bo->mem.mem_type);
 166         struct ttm_resource *mem = &bo->mem;
 167         int ret;
 168
 169         if (mem->bus.io_reserved_vm)
 170                 return 0;
 171
 172         ret = ttm_mem_io_reserve(bo->bdev, mem);
 173         if (unlikely(ret != 0))
 174                 return ret;
 175         mem->bus.io_reserved_vm = true;
 176         if (man->use_io_reserve_lru)
 177                 list_add_tail(&bo->io_reserve_lru,
 178                               &man->io_reserve_lru);
 179         return 0;
 180 }
 181
 182 void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
 183 {
 184         struct ttm_resource *mem = &bo->mem;
 185
 186         if (!mem->bus.io_reserved_vm)
 187                 return;
 188
 189         mem->bus.io_reserved_vm = false;
 190         list_del_init(&bo->io_reserve_lru);
 191         ttm_mem_io_free(bo->bdev, mem);
 192 }
 193
 194 static int ttm_resource_ioremap(struct ttm_bo_device *bdev,
 195                                struct ttm_resource *mem,
 196                                void **virtual)
 197 {
 198         struct ttm_resource_manager *man = ttm_manager_type(bdev, mem->mem_type);
 199         int ret;
 200         void *addr;
 201
 202         *virtual = NULL;
 203         (void) ttm_mem_io_lock(man, false);
 204         ret = ttm_mem_io_reserve(bdev, mem);
 205         ttm_mem_io_unlock(man);
 206         if (ret || !mem->bus.is_iomem)
 207                 return ret;
 208
 209         if (mem->bus.addr) {
 210                 addr = mem->bus.addr;
 211         } else {
 212                 if (mem->placement & TTM_PL_FLAG_WC)
 213                         addr = ioremap_wc(mem->bus.base + mem->bus.offset,
 214                                           mem->bus.size);
 215                 else
 216                         addr = ioremap(mem->bus.base + mem->bus.offset,
 217                                        mem->bus.size);
 218                 if (!addr) {
 219                         (void) ttm_mem_io_lock(man, false);
 220                         ttm_mem_io_free(bdev, mem);
 221                         ttm_mem_io_unlock(man);
 222                         return -ENOMEM;
 223                 }
 224         }
 225         *virtual = addr;
 226         return 0;
 227 }
 228
 229 static void ttm_resource_iounmap(struct ttm_bo_device *bdev,
 230                                 struct ttm_resource *mem,
 231                                 void *virtual)
 232 {
 233         struct ttm_resource_manager *man;
 234
 235         man = ttm_manager_type(bdev, mem->mem_type);
 236
 237         if (virtual && mem->bus.addr == NULL)
 238                 iounmap(virtual);
 239         (void) ttm_mem_io_lock(man, false);
 240         ttm_mem_io_free(bdev, mem);
 241         ttm_mem_io_unlock(man);
 242 }
 243
 244 static int ttm_copy_io_page(void *dst, void *src, unsigned long page)
 245 {
 246         uint32_t *dstP =
 247             (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
 248         uint32_t *srcP =
 249             (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
 250
 251         int i;
 252         for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
 253                 iowrite32(ioread32(srcP++), dstP++);
 254         return 0;
 255 }
 256
 257 static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
 258                                 unsigned long page,
 259                                 pgprot_t prot)
 260 {
 261         struct page *d = ttm->pages[page];
 262         void *dst;
 263
 264         if (!d)
 265                 return -ENOMEM;
 266
 267         src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
 268         dst = kmap_atomic_prot(d, prot);
 269         if (!dst)
 270                 return -ENOMEM;
 271
 272         memcpy_fromio(dst, src, PAGE_SIZE);
 273
 274         kunmap_atomic(dst);
 275
 276         return 0;
 277 }
 278
 279 static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
 280                                 unsigned long page,
 281                                 pgprot_t prot)
 282 {
 283         struct page *s = ttm->pages[page];
 284         void *src;
 285
 286         if (!s)
 287                 return -ENOMEM;
 288
 289         dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
 290         src = kmap_atomic_prot(s, prot);
 291         if (!src)
 292                 return -ENOMEM;
 293
 294         memcpy_toio(dst, src, PAGE_SIZE);
 295
 296         kunmap_atomic(src);
 297
 298         return 0;
 299 }
 300
 301 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
 302                        struct ttm_operation_ctx *ctx,
 303                        struct ttm_resource *new_mem)
 304 {
 305         struct ttm_bo_device *bdev = bo->bdev;
 306         struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type);
 307         struct ttm_tt *ttm = bo->ttm;
 308         struct ttm_resource *old_mem = &bo->mem;
 309         struct ttm_resource old_copy = *old_mem;
 310         void *old_iomap;
 311         void *new_iomap;
 312         int ret;
 313         unsigned long i;
 314         unsigned long page;
 315         unsigned long add = 0;
 316         int dir;
 317
 318         ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
 319         if (ret)
 320                 return ret;
 321
 322         ret = ttm_resource_ioremap(bdev, old_mem, &old_iomap);
 323         if (ret)
 324                 return ret;
 325         ret = ttm_resource_ioremap(bdev, new_mem, &new_iomap);
 326         if (ret)
 327                 goto out;
 328
 329         /*
 330          * Single TTM move. NOP.
 331          */
 332         if (old_iomap == NULL && new_iomap == NULL)
 333                 goto out2;
 334
 335         /*
 336          * Don't move nonexistent data. Clear destination instead.
 337          */
 338         if (old_iomap == NULL &&
 339             (ttm == NULL || (ttm->state == tt_unpopulated &&
 340                              !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
 341                 memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
 342                 goto out2;
 343         }
 344
 345         /*
 346          * TTM might be null for moves within the same region.
 347          */
 348         if (ttm) {
 349                 ret = ttm_tt_populate(ttm, ctx);
 350                 if (ret)
 351                         goto out1;
 352         }
 353
 354         add = 0;
 355         dir = 1;
 356
 357         if ((old_mem->mem_type == new_mem->mem_type) &&
 358             (new_mem->start < old_mem->start + old_mem->size)) {
 359                 dir = -1;
 360                 add = new_mem->num_pages - 1;
 361         }
 362
 363         for (i = 0; i < new_mem->num_pages; ++i) {
 364                 page = i * dir + add;
 365                 if (old_iomap == NULL) {
 366                         pgprot_t prot = ttm_io_prot(old_mem->placement,
 367                                                     PAGE_KERNEL);
 368                         ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
 369                                                    prot);
 370                 } else if (new_iomap == NULL) {
 371                         pgprot_t prot = ttm_io_prot(new_mem->placement,
 372                                                     PAGE_KERNEL);
 373                         ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
 374                                                    prot);
 375                 } else {
 376                         ret = ttm_copy_io_page(new_iomap, old_iomap, page);
 377                 }
 378                 if (ret)
 379                         goto out1;
 380         }
 381         mb();
 382 out2:
 383         old_copy = *old_mem;
 384         *old_mem = *new_mem;
 385         new_mem->mm_node = NULL;
 386
 387         if (!man->use_tt) {
 388                 ttm_tt_destroy(ttm);
 389                 bo->ttm = NULL;
 390         }
 391
 392 out1:
 393         ttm_resource_iounmap(bdev, old_mem, new_iomap);
 394 out:
 395         ttm_resource_iounmap(bdev, &old_copy, old_iomap);
 396
 397         /*
 398          * On error, keep the mm node!
 399          */
 400         if (!ret)
 401                 ttm_resource_free(bo, &old_copy);
 402         return ret;
 403 }
 404 EXPORT_SYMBOL(ttm_bo_move_memcpy);
 405
 406 static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
 407 {
 408         struct ttm_transfer_obj *fbo;
 409
 410         fbo = container_of(bo, struct ttm_transfer_obj, base);
 411         ttm_bo_put(fbo->bo);
 412         kfree(fbo);
 413 }
 414
 415 /**
 416  * ttm_buffer_object_transfer
 417  *
 418  * @bo: A pointer to a struct ttm_buffer_object.
 419  * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
 420  * holding the data of @bo with the old placement.
 421  *
 422  * This is a utility function that may be called after an accelerated move
 423  * has been scheduled. A new buffer object is created as a placeholder for
 424  * the old data while it's being copied. When that buffer object is idle,
 425  * it can be destroyed, releasing the space of the old placement.
 426  * Returns:
 427  * !0: Failure.
 428  */
 429
 430 static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 431                                       struct ttm_buffer_object **new_obj)
 432 {
 433         struct ttm_transfer_obj *fbo;
 434         int ret;
 435
 436         fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
 437         if (!fbo)
 438                 return -ENOMEM;
 439
 440         fbo->base = *bo;
 441         fbo->base.mem.placement |= TTM_PL_FLAG_NO_EVICT;
 442
 443         ttm_bo_get(bo);
 444         fbo->bo = bo;
 445
 446         /**
 447          * Fix up members that we shouldn't copy directly:
 448          * TODO: Explicit member copy would probably be better here.
 449          */
 450
 451         atomic_inc(&ttm_bo_glob.bo_count);
 452         INIT_LIST_HEAD(&fbo->base.ddestroy);
 453         INIT_LIST_HEAD(&fbo->base.lru);
 454         INIT_LIST_HEAD(&fbo->base.swap);
 455         INIT_LIST_HEAD(&fbo->base.io_reserve_lru);
 456         fbo->base.moving = NULL;
 457         drm_vma_node_reset(&fbo->base.base.vma_node);
 458
 459         kref_init(&fbo->base.kref);
 460         fbo->base.destroy = &ttm_transfered_destroy;
 461         fbo->base.acc_size = 0;
 462         if (bo->type != ttm_bo_type_sg)
 463                 fbo->base.base.resv = &fbo->base.base._resv;
 464
 465         dma_resv_init(&fbo->base.base._resv);
 466         fbo->base.base.dev = NULL;
 467         ret = dma_resv_trylock(&fbo->base.base._resv);
 468         WARN_ON(!ret);
 469
 470         *new_obj = &fbo->base;
 471         return 0;
 472 }
 473
 474 pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
 475 {
 476         /* Cached mappings need no adjustment */
 477         if (caching_flags & TTM_PL_FLAG_CACHED)
 478                 return tmp;
 479
 480 #if defined(__i386__) || defined(__x86_64__)
 481         if (caching_flags & TTM_PL_FLAG_WC)
 482                 tmp = pgprot_writecombine(tmp);
 483         else if (boot_cpu_data.x86 > 3)
 484                 tmp = pgprot_noncached(tmp);
 485 #endif
 486 #if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
 487     defined(__powerpc__) || defined(__mips__)
 488         if (caching_flags & TTM_PL_FLAG_WC)
 489                 tmp = pgprot_writecombine(tmp);
 490         else
 491                 tmp = pgprot_noncached(tmp);
 492 #endif
 493 #if defined(__sparc__)
 494         tmp = pgprot_noncached(tmp);
 495 #endif
 496         return tmp;
 497 }
 498 EXPORT_SYMBOL(ttm_io_prot);
 499
 500 static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
 501                           unsigned long offset,
 502                           unsigned long size,
 503                           struct ttm_bo_kmap_obj *map)
 504 {
 505         struct ttm_resource *mem = &bo->mem;
 506
 507         if (bo->mem.bus.addr) {
 508                 map->bo_kmap_type = ttm_bo_map_premapped;
 509                 map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);
 510         } else {
 511                 map->bo_kmap_type = ttm_bo_map_iomap;
 512                 if (mem->placement & TTM_PL_FLAG_WC)
 513                         map->virtual = ioremap_wc(bo->mem.bus.base +
 514                                                   bo->mem.bus.offset + offset,
 515                                                   size);
 516                 else
 517                         map->virtual = ioremap(bo->mem.bus.base +
 518                                                bo->mem.bus.offset + offset,
 519                                                size);
 520         }
 521         return (!map->virtual) ? -ENOMEM : 0;
 522 }
 523
 524 static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
 525                            unsigned long start_page,
 526                            unsigned long num_pages,
 527                            struct ttm_bo_kmap_obj *map)
 528 {
 529         struct ttm_resource *mem = &bo->mem;
 530         struct ttm_operation_ctx ctx = {
 531                 .interruptible = false,
 532                 .no_wait_gpu = false
 533         };
 534         struct ttm_tt *ttm;
 535         pgprot_t prot;
 536         int ret;
 537
 538         ret = ttm_tt_create(bo, true);
 539         if (ret)
 540                 return ret;
 541
 542         ttm = bo->ttm;
 543         ret = ttm_tt_populate(ttm, &ctx);
 544         if (ret)
 545                 return ret;
 546
 547         if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
 548                 /*
 549                  * We're mapping a single page, and the desired
 550                  * page protection is consistent with the bo.
 551                  */
 552
 553                 map->bo_kmap_type = ttm_bo_map_kmap;
 554                 map->page = ttm->pages[start_page];
 555                 map->virtual = kmap(map->page);
 556         } else {
 557                 /*
 558                  * We need to use vmap to get the desired page protection
 559                  * or to make the buffer object look contiguous.
 560                  */
 561                 prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
 562                 map->bo_kmap_type = ttm_bo_map_vmap;
 563                 map->virtual = vmap(ttm->pages + start_page, num_pages,
 564                                     0, prot);
 565         }
 566         return (!map->virtual) ? -ENOMEM : 0;
 567 }
 568
 569 int ttm_bo_kmap(struct ttm_buffer_object *bo,
 570                 unsigned long start_page, unsigned long num_pages,
 571                 struct ttm_bo_kmap_obj *map)
 572 {
 573         struct ttm_resource_manager *man =
 574                 ttm_manager_type(bo->bdev, bo->mem.mem_type);
 575         unsigned long offset, size;
 576         int ret;
 577
 578         map->virtual = NULL;
 579         map->bo = bo;
 580         if (num_pages > bo->num_pages)
 581                 return -EINVAL;
 582         if (start_page > bo->num_pages)
 583                 return -EINVAL;
 584
 585         (void) ttm_mem_io_lock(man, false);
 586         ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
 587         ttm_mem_io_unlock(man);
 588         if (ret)
 589                 return ret;
 590         if (!bo->mem.bus.is_iomem) {
 591                 return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
 592         } else {
 593                 offset = start_page << PAGE_SHIFT;
 594                 size = num_pages << PAGE_SHIFT;
 595                 return ttm_bo_ioremap(bo, offset, size, map);
 596         }
 597 }
 598 EXPORT_SYMBOL(ttm_bo_kmap);
 599
 600 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
 601 {
 602         struct ttm_buffer_object *bo = map->bo;
 603         struct ttm_resource_manager *man =
 604                 ttm_manager_type(bo->bdev, bo->mem.mem_type);
 605
 606         if (!map->virtual)
 607                 return;
 608         switch (map->bo_kmap_type) {
 609         case ttm_bo_map_iomap:
 610                 iounmap(map->virtual);
 611                 break;
 612         case ttm_bo_map_vmap:
 613                 vunmap(map->virtual);
 614                 break;
 615         case ttm_bo_map_kmap:
 616                 kunmap(map->page);
 617                 break;
 618         case ttm_bo_map_premapped:
 619                 break;
 620         default:
 621                 BUG();
 622         }
 623         (void) ttm_mem_io_lock(man, false);
 624         ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
 625         ttm_mem_io_unlock(man);
 626         map->virtual = NULL;
 627         map->page = NULL;
 628 }
 629 EXPORT_SYMBOL(ttm_bo_kunmap);
 630
 631 int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
 632                               struct dma_fence *fence,
 633                               bool evict,
 634                               struct ttm_resource *new_mem)
 635 {
 636         struct ttm_bo_device *bdev = bo->bdev;
 637         struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type);
 638         struct ttm_resource *old_mem = &bo->mem;
 639         int ret;
 640         struct ttm_buffer_object *ghost_obj;
 641
 642         dma_resv_add_excl_fence(bo->base.resv, fence);
 643         if (evict) {
 644                 ret = ttm_bo_wait(bo, false, false);
 645                 if (ret)
 646                         return ret;
 647
 648                 if (!man->use_tt) {
 649                         ttm_tt_destroy(bo->ttm);
 650                         bo->ttm = NULL;
 651                 }
 652                 ttm_bo_free_old_node(bo);
 653         } else {
 654                 /**
 655                  * This should help pipeline ordinary buffer moves.
 656                  *
 657                  * Hang old buffer memory on a new buffer object,
 658                  * and leave it to be released when the GPU
 659                  * operation has completed.
 660                  */
 661
 662                 dma_fence_put(bo->moving);
 663                 bo->moving = dma_fence_get(fence);
 664
 665                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 666                 if (ret)
 667                         return ret;
 668
 669                 dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
 670
 671                 /**
 672                  * If we're not moving to fixed memory, the TTM object
 673                  * needs to stay alive. Otherwhise hang it on the ghost
 674                  * bo to be unbound and destroyed.
 675                  */
 676
 677                 if (man->use_tt)
 678                         ghost_obj->ttm = NULL;
 679                 else
 680                         bo->ttm = NULL;
 681
 682                 dma_resv_unlock(&ghost_obj->base._resv);
 683                 ttm_bo_put(ghost_obj);
 684         }
 685
 686         *old_mem = *new_mem;
 687         new_mem->mm_node = NULL;
 688
 689         return 0;
 690 }
 691 EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
 692
 693 int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
 694                          struct dma_fence *fence, bool evict,
 695                          struct ttm_resource *new_mem)
 696 {
 697         struct ttm_bo_device *bdev = bo->bdev;
 698         struct ttm_resource *old_mem = &bo->mem;
 699
 700         struct ttm_resource_manager *from = ttm_manager_type(bdev, old_mem->mem_type);
 701         struct ttm_resource_manager *to = ttm_manager_type(bdev, new_mem->mem_type);
 702
 703         int ret;
 704
 705         dma_resv_add_excl_fence(bo->base.resv, fence);
 706
 707         if (!evict) {
 708                 struct ttm_buffer_object *ghost_obj;
 709
 710                 /**
 711                  * This should help pipeline ordinary buffer moves.
 712                  *
 713                  * Hang old buffer memory on a new buffer object,
 714                  * and leave it to be released when the GPU
 715                  * operation has completed.
 716                  */
 717
 718                 dma_fence_put(bo->moving);
 719                 bo->moving = dma_fence_get(fence);
 720
 721                 ret = ttm_buffer_object_transfer(bo, &ghost_obj);
 722                 if (ret)
 723                         return ret;
 724
 725                 dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
 726
 727                 /**
 728                  * If we're not moving to fixed memory, the TTM object
 729                  * needs to stay alive. Otherwhise hang it on the ghost
 730                  * bo to be unbound and destroyed.
 731                  */
 732
 733                 if (to->use_tt)
 734                         ghost_obj->ttm = NULL;
 735                 else
 736                         bo->ttm = NULL;
 737
 738                 dma_resv_unlock(&ghost_obj->base._resv);
 739                 ttm_bo_put(ghost_obj);
 740
 741         } else if (!from->use_tt) {
 742
 743                 /**
 744                  * BO doesn't have a TTM we need to bind/unbind. Just remember
 745                  * this eviction and free up the allocation
 746                  */
 747
 748                 spin_lock(&from->move_lock);
 749                 if (!from->move || dma_fence_is_later(fence, from->move)) {
 750                         dma_fence_put(from->move);
 751                         from->move = dma_fence_get(fence);
 752                 }
 753                 spin_unlock(&from->move_lock);
 754
 755                 ttm_bo_free_old_node(bo);
 756
 757                 dma_fence_put(bo->moving);
 758                 bo->moving = dma_fence_get(fence);
 759
 760         } else {
 761                 /**
 762                  * Last resort, wait for the move to be completed.
 763                  *
 764                  * Should never happen in pratice.
 765                  */
 766
 767                 ret = ttm_bo_wait(bo, false, false);
 768                 if (ret)
 769                         return ret;
 770
 771                 if (!to->use_tt) {
 772                         ttm_tt_destroy(bo->ttm);
 773                         bo->ttm = NULL;
 774                 }
 775                 ttm_bo_free_old_node(bo);
 776         }
 777
 778         *old_mem = *new_mem;
 779         new_mem->mm_node = NULL;
 780
 781         return 0;
 782 }
 783 EXPORT_SYMBOL(ttm_bo_pipeline_move);
 784
 785 int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
 786 {
 787         struct ttm_buffer_object *ghost;
 788         int ret;
 789
 790         ret = ttm_buffer_object_transfer(bo, &ghost);
 791         if (ret)
 792                 return ret;
 793
 794         ret = dma_resv_copy_fences(&ghost->base._resv, bo->base.resv);
 795         /* Last resort, wait for the BO to be idle when we are OOM */
 796         if (ret)
 797                 ttm_bo_wait(bo, false, false);
 798
 799         memset(&bo->mem, 0, sizeof(bo->mem));
 800         bo->mem.mem_type = TTM_PL_SYSTEM;
 801         bo->ttm = NULL;
 802
 803         dma_resv_unlock(&ghost->base._resv);
 804         ttm_bo_put(ghost);
 805
 806         return 0;
 807 }