drivers/gpu/drm/ttm/ttm_bo.c

   1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2 /**************************************************************************
   3  *
   4  * Copyright (c) 2006-2009 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 #define pr_fmt(fmt) "[TTM] " fmt
  33
  34 #include <drm/ttm/ttm_module.h>
  35 #include <drm/ttm/ttm_bo_driver.h>
  36 #include <drm/ttm/ttm_placement.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/slab.h>
  39 #include <linux/sched.h>
  40 #include <linux/mm.h>
  41 #include <linux/file.h>
  42 #include <linux/module.h>
  43 #include <linux/atomic.h>
  44 #include <linux/dma-resv.h>
  45
  46 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  47
  48 /**
  49  * ttm_global_mutex - protecting the global BO state
  50  */
  51 DEFINE_MUTEX(ttm_global_mutex);
  52 unsigned ttm_bo_glob_use_count;
  53 struct ttm_bo_global ttm_bo_glob;
  54
  55 static struct attribute ttm_bo_count = {
  56         .name = "bo_count",
  57         .mode = S_IRUGO
  58 };
  59
  60 /* default destructor */
  61 static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
  62 {
  63         kfree(bo);
  64 }
  65
  66 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
  67                                           uint32_t *mem_type)
  68 {
  69         int pos;
  70
  71         pos = ffs(place->flags & TTM_PL_MASK_MEM);
  72         if (unlikely(!pos))
  73                 return -EINVAL;
  74
  75         *mem_type = pos - 1;
  76         return 0;
  77 }
  78
  79 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p,
  80                                int mem_type)
  81 {
  82         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  83
  84         drm_printf(p, "    has_type: %d\n", man->has_type);
  85         drm_printf(p, "    use_type: %d\n", man->use_type);
  86         drm_printf(p, "    flags: 0x%08X\n", man->flags);
  87         drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
  88         drm_printf(p, "    size: %llu\n", man->size);
  89         drm_printf(p, "    available_caching: 0x%08X\n", man->available_caching);
  90         drm_printf(p, "    default_caching: 0x%08X\n", man->default_caching);
  91         if (mem_type != TTM_PL_SYSTEM)
  92                 (*man->func->debug)(man, p);
  93 }
  94
  95 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  96                                         struct ttm_placement *placement)
  97 {
  98         struct drm_printer p = drm_debug_printer(TTM_PFX);
  99         int i, ret, mem_type;
 100
 101         drm_printf(&p, "No space for %p (%lu pages, %luK, %luM)\n",
 102                    bo, bo->mem.num_pages, bo->mem.size >> 10,
 103                    bo->mem.size >> 20);
 104         for (i = 0; i < placement->num_placement; i++) {
 105                 ret = ttm_mem_type_from_place(&placement->placement[i],
 106                                                 &mem_type);
 107                 if (ret)
 108                         return;
 109                 drm_printf(&p, "  placement[%d]=0x%08X (%d)\n",
 110                            i, placement->placement[i].flags, mem_type);
 111                 ttm_mem_type_debug(bo->bdev, &p, mem_type);
 112         }
 113 }
 114
 115 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 116                                   struct attribute *attr,
 117                                   char *buffer)
 118 {
 119         struct ttm_bo_global *glob =
 120                 container_of(kobj, struct ttm_bo_global, kobj);
 121
 122         return snprintf(buffer, PAGE_SIZE, "%d\n",
 123                                 atomic_read(&glob->bo_count));
 124 }
 125
 126 static struct attribute *ttm_bo_global_attrs[] = {
 127         &ttm_bo_count,
 128         NULL
 129 };
 130
 131 static const struct sysfs_ops ttm_bo_global_ops = {
 132         .show = &ttm_bo_global_show
 133 };
 134
 135 static struct kobj_type ttm_bo_glob_kobj_type  = {
 136         .release = &ttm_bo_global_kobj_release,
 137         .sysfs_ops = &ttm_bo_global_ops,
 138         .default_attrs = ttm_bo_global_attrs
 139 };
 140
 141
 142 static inline uint32_t ttm_bo_type_flags(unsigned type)
 143 {
 144         return 1 << (type);
 145 }
 146
 147 static void ttm_bo_release_list(struct kref *list_kref)
 148 {
 149         struct ttm_buffer_object *bo =
 150             container_of(list_kref, struct ttm_buffer_object, list_kref);
 151         struct ttm_bo_device *bdev = bo->bdev;
 152         size_t acc_size = bo->acc_size;
 153
 154         BUG_ON(kref_read(&bo->list_kref));
 155         BUG_ON(kref_read(&bo->kref));
 156         BUG_ON(atomic_read(&bo->cpu_writers));
 157         BUG_ON(bo->mem.mm_node != NULL);
 158         BUG_ON(!list_empty(&bo->lru));
 159         BUG_ON(!list_empty(&bo->ddestroy));
 160         ttm_tt_destroy(bo->ttm);
 161         atomic_dec(&bo->bdev->glob->bo_count);
 162         dma_fence_put(bo->moving);
 163         if (!ttm_bo_uses_embedded_gem_object(bo))
 164                 dma_resv_fini(&bo->base._resv);
 165         mutex_destroy(&bo->wu_mutex);
 166         bo->destroy(bo);
 167         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 168 }
 169
 170 static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
 171                                   struct ttm_mem_reg *mem)
 172 {
 173         struct ttm_bo_device *bdev = bo->bdev;
 174         struct ttm_mem_type_manager *man;
 175
 176         dma_resv_assert_held(bo->base.resv);
 177
 178         if (!list_empty(&bo->lru))
 179                 return;
 180
 181         if (mem->placement & TTM_PL_FLAG_NO_EVICT)
 182                 return;
 183
 184         man = &bdev->man[mem->mem_type];
 185         list_add_tail(&bo->lru, &man->lru[bo->priority]);
 186         kref_get(&bo->list_kref);
 187
 188         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm &&
 189             !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
 190                                      TTM_PAGE_FLAG_SWAPPED))) {
 191                 list_add_tail(&bo->swap, &bdev->glob->swap_lru[bo->priority]);
 192                 kref_get(&bo->list_kref);
 193         }
 194 }
 195
 196 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 197 {
 198         ttm_bo_add_mem_to_lru(bo, &bo->mem);
 199 }
 200 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 201
 202 static void ttm_bo_ref_bug(struct kref *list_kref)
 203 {
 204         BUG();
 205 }
 206
 207 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 208 {
 209         struct ttm_bo_device *bdev = bo->bdev;
 210         bool notify = false;
 211
 212         if (!list_empty(&bo->swap)) {
 213                 list_del_init(&bo->swap);
 214                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 215                 notify = true;
 216         }
 217         if (!list_empty(&bo->lru)) {
 218                 list_del_init(&bo->lru);
 219                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 220                 notify = true;
 221         }
 222
 223         if (notify && bdev->driver->del_from_lru_notify)
 224                 bdev->driver->del_from_lru_notify(bo);
 225 }
 226
 227 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 228 {
 229         struct ttm_bo_global *glob = bo->bdev->glob;
 230
 231         spin_lock(&glob->lru_lock);
 232         ttm_bo_del_from_lru(bo);
 233         spin_unlock(&glob->lru_lock);
 234 }
 235 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 236
 237 static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
 238                                      struct ttm_buffer_object *bo)
 239 {
 240         if (!pos->first)
 241                 pos->first = bo;
 242         pos->last = bo;
 243 }
 244
 245 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 246                              struct ttm_lru_bulk_move *bulk)
 247 {
 248         dma_resv_assert_held(bo->base.resv);
 249
 250         ttm_bo_del_from_lru(bo);
 251         ttm_bo_add_to_lru(bo);
 252
 253         if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 254                 switch (bo->mem.mem_type) {
 255                 case TTM_PL_TT:
 256                         ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
 257                         break;
 258
 259                 case TTM_PL_VRAM:
 260                         ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
 261                         break;
 262                 }
 263                 if (bo->ttm && !(bo->ttm->page_flags &
 264                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
 265                         ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
 266         }
 267 }
 268 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 269
 270 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
 271 {
 272         unsigned i;
 273
 274         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 275                 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
 276                 struct ttm_mem_type_manager *man;
 277
 278                 if (!pos->first)
 279                         continue;
 280
 281                 dma_resv_assert_held(pos->first->base.resv);
 282                 dma_resv_assert_held(pos->last->base.resv);
 283
 284                 man = &pos->first->bdev->man[TTM_PL_TT];
 285                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 286                                     &pos->last->lru);
 287         }
 288
 289         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 290                 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
 291                 struct ttm_mem_type_manager *man;
 292
 293                 if (!pos->first)
 294                         continue;
 295
 296                 dma_resv_assert_held(pos->first->base.resv);
 297                 dma_resv_assert_held(pos->last->base.resv);
 298
 299                 man = &pos->first->bdev->man[TTM_PL_VRAM];
 300                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 301                                     &pos->last->lru);
 302         }
 303
 304         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 305                 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
 306                 struct list_head *lru;
 307
 308                 if (!pos->first)
 309                         continue;
 310
 311                 dma_resv_assert_held(pos->first->base.resv);
 312                 dma_resv_assert_held(pos->last->base.resv);
 313
 314                 lru = &pos->first->bdev->glob->swap_lru[i];
 315                 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
 316         }
 317 }
 318 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
 319
 320 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 321                                   struct ttm_mem_reg *mem, bool evict,
 322                                   struct ttm_operation_ctx *ctx)
 323 {
 324         struct ttm_bo_device *bdev = bo->bdev;
 325         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 326         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 327         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 328         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 329         int ret = 0;
 330
 331         if (old_is_pci || new_is_pci ||
 332             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 333                 ret = ttm_mem_io_lock(old_man, true);
 334                 if (unlikely(ret != 0))
 335                         goto out_err;
 336                 ttm_bo_unmap_virtual_locked(bo);
 337                 ttm_mem_io_unlock(old_man);
 338         }
 339
 340         /*
 341          * Create and bind a ttm if required.
 342          */
 343
 344         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 345                 if (bo->ttm == NULL) {
 346                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 347                         ret = ttm_tt_create(bo, zero);
 348                         if (ret)
 349                                 goto out_err;
 350                 }
 351
 352                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 353                 if (ret)
 354                         goto out_err;
 355
 356                 if (mem->mem_type != TTM_PL_SYSTEM) {
 357                         ret = ttm_tt_bind(bo->ttm, mem, ctx);
 358                         if (ret)
 359                                 goto out_err;
 360                 }
 361
 362                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 363                         if (bdev->driver->move_notify)
 364                                 bdev->driver->move_notify(bo, evict, mem);
 365                         bo->mem = *mem;
 366                         mem->mm_node = NULL;
 367                         goto moved;
 368                 }
 369         }
 370
 371         if (bdev->driver->move_notify)
 372                 bdev->driver->move_notify(bo, evict, mem);
 373
 374         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 375             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 376                 ret = ttm_bo_move_ttm(bo, ctx, mem);
 377         else if (bdev->driver->move)
 378                 ret = bdev->driver->move(bo, evict, ctx, mem);
 379         else
 380                 ret = ttm_bo_move_memcpy(bo, ctx, mem);
 381
 382         if (ret) {
 383                 if (bdev->driver->move_notify) {
 384                         swap(*mem, bo->mem);
 385                         bdev->driver->move_notify(bo, false, mem);
 386                         swap(*mem, bo->mem);
 387                 }
 388
 389                 goto out_err;
 390         }
 391
 392 moved:
 393         if (bo->evicted) {
 394                 if (bdev->driver->invalidate_caches) {
 395                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 396                         if (ret)
 397                                 pr_err("Can not flush read caches\n");
 398                 }
 399                 bo->evicted = false;
 400         }
 401
 402         if (bo->mem.mm_node)
 403                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 404                     bdev->man[bo->mem.mem_type].gpu_offset;
 405         else
 406                 bo->offset = 0;
 407
 408         ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
 409         return 0;
 410
 411 out_err:
 412         new_man = &bdev->man[bo->mem.mem_type];
 413         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 414                 ttm_tt_destroy(bo->ttm);
 415                 bo->ttm = NULL;
 416         }
 417
 418         return ret;
 419 }
 420
 421 /**
 422  * Call bo::reserved.
 423  * Will release GPU memory type usage on destruction.
 424  * This is the place to put in driver specific hooks to release
 425  * driver private resources.
 426  * Will release the bo::reserved lock.
 427  */
 428
 429 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 430 {
 431         if (bo->bdev->driver->move_notify)
 432                 bo->bdev->driver->move_notify(bo, false, NULL);
 433
 434         ttm_tt_destroy(bo->ttm);
 435         bo->ttm = NULL;
 436         ttm_bo_mem_put(bo, &bo->mem);
 437 }
 438
 439 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 440 {
 441         int r;
 442
 443         if (bo->base.resv == &bo->base._resv)
 444                 return 0;
 445
 446         BUG_ON(!dma_resv_trylock(&bo->base._resv));
 447
 448         r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
 449         if (r)
 450                 dma_resv_unlock(&bo->base._resv);
 451
 452         return r;
 453 }
 454
 455 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 456 {
 457         struct dma_resv_list *fobj;
 458         struct dma_fence *fence;
 459         int i;
 460
 461         fobj = dma_resv_get_list(&bo->base._resv);
 462         fence = dma_resv_get_excl(&bo->base._resv);
 463         if (fence && !fence->ops->signaled)
 464                 dma_fence_enable_sw_signaling(fence);
 465
 466         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 467                 fence = rcu_dereference_protected(fobj->shared[i],
 468                                         dma_resv_held(bo->base.resv));
 469
 470                 if (!fence->ops->signaled)
 471                         dma_fence_enable_sw_signaling(fence);
 472         }
 473 }
 474
 475 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 476 {
 477         struct ttm_bo_device *bdev = bo->bdev;
 478         struct ttm_bo_global *glob = bdev->glob;
 479         int ret;
 480
 481         ret = ttm_bo_individualize_resv(bo);
 482         if (ret) {
 483                 /* Last resort, if we fail to allocate memory for the
 484                  * fences block for the BO to become idle
 485                  */
 486                 dma_resv_wait_timeout_rcu(bo->base.resv, true, false,
 487                                                     30 * HZ);
 488                 spin_lock(&glob->lru_lock);
 489                 goto error;
 490         }
 491
 492         spin_lock(&glob->lru_lock);
 493         ret = dma_resv_trylock(bo->base.resv) ? 0 : -EBUSY;
 494         if (!ret) {
 495                 if (dma_resv_test_signaled_rcu(&bo->base._resv, true)) {
 496                         ttm_bo_del_from_lru(bo);
 497                         spin_unlock(&glob->lru_lock);
 498                         if (bo->base.resv != &bo->base._resv)
 499                                 dma_resv_unlock(&bo->base._resv);
 500
 501                         ttm_bo_cleanup_memtype_use(bo);
 502                         dma_resv_unlock(bo->base.resv);
 503                         return;
 504                 }
 505
 506                 ttm_bo_flush_all_fences(bo);
 507
 508                 /*
 509                  * Make NO_EVICT bos immediately available to
 510                  * shrinkers, now that they are queued for
 511                  * destruction.
 512                  */
 513                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 514                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 515                         ttm_bo_add_to_lru(bo);
 516                 }
 517
 518                 dma_resv_unlock(bo->base.resv);
 519         }
 520         if (bo->base.resv != &bo->base._resv)
 521                 dma_resv_unlock(&bo->base._resv);
 522
 523 error:
 524         kref_get(&bo->list_kref);
 525         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 526         spin_unlock(&glob->lru_lock);
 527
 528         schedule_delayed_work(&bdev->wq,
 529                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 530 }
 531
 532 /**
 533  * function ttm_bo_cleanup_refs
 534  * If bo idle, remove from delayed- and lru lists, and unref.
 535  * If not idle, do nothing.
 536  *
 537  * Must be called with lru_lock and reservation held, this function
 538  * will drop the lru lock and optionally the reservation lock before returning.
 539  *
 540  * @interruptible         Any sleeps should occur interruptibly.
 541  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 542  * @unlock_resv           Unlock the reservation lock as well.
 543  */
 544
 545 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 546                                bool interruptible, bool no_wait_gpu,
 547                                bool unlock_resv)
 548 {
 549         struct ttm_bo_global *glob = bo->bdev->glob;
 550         struct dma_resv *resv;
 551         int ret;
 552
 553         if (unlikely(list_empty(&bo->ddestroy)))
 554                 resv = bo->base.resv;
 555         else
 556                 resv = &bo->base._resv;
 557
 558         if (dma_resv_test_signaled_rcu(resv, true))
 559                 ret = 0;
 560         else
 561                 ret = -EBUSY;
 562
 563         if (ret && !no_wait_gpu) {
 564                 long lret;
 565
 566                 if (unlock_resv)
 567                         dma_resv_unlock(bo->base.resv);
 568                 spin_unlock(&glob->lru_lock);
 569
 570                 lret = dma_resv_wait_timeout_rcu(resv, true,
 571                                                            interruptible,
 572                                                            30 * HZ);
 573
 574                 if (lret < 0)
 575                         return lret;
 576                 else if (lret == 0)
 577                         return -EBUSY;
 578
 579                 spin_lock(&glob->lru_lock);
 580                 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
 581                         /*
 582                          * We raced, and lost, someone else holds the reservation now,
 583                          * and is probably busy in ttm_bo_cleanup_memtype_use.
 584                          *
 585                          * Even if it's not the case, because we finished waiting any
 586                          * delayed destruction would succeed, so just return success
 587                          * here.
 588                          */
 589                         spin_unlock(&glob->lru_lock);
 590                         return 0;
 591                 }
 592                 ret = 0;
 593         }
 594
 595         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 596                 if (unlock_resv)
 597                         dma_resv_unlock(bo->base.resv);
 598                 spin_unlock(&glob->lru_lock);
 599                 return ret;
 600         }
 601
 602         ttm_bo_del_from_lru(bo);
 603         list_del_init(&bo->ddestroy);
 604         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 605
 606         spin_unlock(&glob->lru_lock);
 607         ttm_bo_cleanup_memtype_use(bo);
 608
 609         if (unlock_resv)
 610                 dma_resv_unlock(bo->base.resv);
 611
 612         return 0;
 613 }
 614
 615 /**
 616  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 617  * encountered buffers.
 618  */
 619 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 620 {
 621         struct ttm_bo_global *glob = bdev->glob;
 622         struct list_head removed;
 623         bool empty;
 624
 625         INIT_LIST_HEAD(&removed);
 626
 627         spin_lock(&glob->lru_lock);
 628         while (!list_empty(&bdev->ddestroy)) {
 629                 struct ttm_buffer_object *bo;
 630
 631                 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
 632                                       ddestroy);
 633                 kref_get(&bo->list_kref);
 634                 list_move_tail(&bo->ddestroy, &removed);
 635
 636                 if (remove_all || bo->base.resv != &bo->base._resv) {
 637                         spin_unlock(&glob->lru_lock);
 638                         dma_resv_lock(bo->base.resv, NULL);
 639
 640                         spin_lock(&glob->lru_lock);
 641                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 642
 643                 } else if (dma_resv_trylock(bo->base.resv)) {
 644                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 645                 } else {
 646                         spin_unlock(&glob->lru_lock);
 647                 }
 648
 649                 kref_put(&bo->list_kref, ttm_bo_release_list);
 650                 spin_lock(&glob->lru_lock);
 651         }
 652         list_splice_tail(&removed, &bdev->ddestroy);
 653         empty = list_empty(&bdev->ddestroy);
 654         spin_unlock(&glob->lru_lock);
 655
 656         return empty;
 657 }
 658
 659 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 660 {
 661         struct ttm_bo_device *bdev =
 662             container_of(work, struct ttm_bo_device, wq.work);
 663
 664         if (!ttm_bo_delayed_delete(bdev, false))
 665                 schedule_delayed_work(&bdev->wq,
 666                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 667 }
 668
 669 static void ttm_bo_release(struct kref *kref)
 670 {
 671         struct ttm_buffer_object *bo =
 672             container_of(kref, struct ttm_buffer_object, kref);
 673         struct ttm_bo_device *bdev = bo->bdev;
 674         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 675
 676         if (bo->bdev->driver->release_notify)
 677                 bo->bdev->driver->release_notify(bo);
 678
 679         drm_vma_offset_remove(bdev->vma_manager, &bo->base.vma_node);
 680         ttm_mem_io_lock(man, false);
 681         ttm_mem_io_free_vm(bo);
 682         ttm_mem_io_unlock(man);
 683         ttm_bo_cleanup_refs_or_queue(bo);
 684         kref_put(&bo->list_kref, ttm_bo_release_list);
 685 }
 686
 687 void ttm_bo_put(struct ttm_buffer_object *bo)
 688 {
 689         kref_put(&bo->kref, ttm_bo_release);
 690 }
 691 EXPORT_SYMBOL(ttm_bo_put);
 692
 693 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 694 {
 695         return cancel_delayed_work_sync(&bdev->wq);
 696 }
 697 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 698
 699 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 700 {
 701         if (resched)
 702                 schedule_delayed_work(&bdev->wq,
 703                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 704 }
 705 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 706
 707 static int ttm_bo_evict(struct ttm_buffer_object *bo,
 708                         struct ttm_operation_ctx *ctx)
 709 {
 710         struct ttm_bo_device *bdev = bo->bdev;
 711         struct ttm_mem_reg evict_mem;
 712         struct ttm_placement placement;
 713         int ret = 0;
 714
 715         dma_resv_assert_held(bo->base.resv);
 716
 717         placement.num_placement = 0;
 718         placement.num_busy_placement = 0;
 719         bdev->driver->evict_flags(bo, &placement);
 720
 721         if (!placement.num_placement && !placement.num_busy_placement) {
 722                 ret = ttm_bo_pipeline_gutting(bo);
 723                 if (ret)
 724                         return ret;
 725
 726                 return ttm_tt_create(bo, false);
 727         }
 728
 729         evict_mem = bo->mem;
 730         evict_mem.mm_node = NULL;
 731         evict_mem.bus.io_reserved_vm = false;
 732         evict_mem.bus.io_reserved_count = 0;
 733
 734         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 735         if (ret) {
 736                 if (ret != -ERESTARTSYS) {
 737                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 738                                bo);
 739                         ttm_bo_mem_space_debug(bo, &placement);
 740                 }
 741                 goto out;
 742         }
 743
 744         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
 745         if (unlikely(ret)) {
 746                 if (ret != -ERESTARTSYS)
 747                         pr_err("Buffer eviction failed\n");
 748                 ttm_bo_mem_put(bo, &evict_mem);
 749                 goto out;
 750         }
 751         bo->evicted = true;
 752 out:
 753         return ret;
 754 }
 755
 756 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 757                               const struct ttm_place *place)
 758 {
 759         /* Don't evict this BO if it's outside of the
 760          * requested placement range
 761          */
 762         if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 763             (place->lpfn && place->lpfn <= bo->mem.start))
 764                 return false;
 765
 766         return true;
 767 }
 768 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 769
 770 /**
 771  * Check the target bo is allowable to be evicted or swapout, including cases:
 772  *
 773  * a. if share same reservation object with ctx->resv, have assumption
 774  * reservation objects should already be locked, so not lock again and
 775  * return true directly when either the opreation allow_reserved_eviction
 776  * or the target bo already is in delayed free list;
 777  *
 778  * b. Otherwise, trylock it.
 779  */
 780 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 781                         struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
 782 {
 783         bool ret = false;
 784
 785         if (bo->base.resv == ctx->resv) {
 786                 dma_resv_assert_held(bo->base.resv);
 787                 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT
 788                     || !list_empty(&bo->ddestroy))
 789                         ret = true;
 790                 *locked = false;
 791                 if (busy)
 792                         *busy = false;
 793         } else {
 794                 ret = dma_resv_trylock(bo->base.resv);
 795                 *locked = ret;
 796                 if (busy)
 797                         *busy = !ret;
 798         }
 799
 800         return ret;
 801 }
 802
 803 /**
 804  * ttm_mem_evict_wait_busy - wait for a busy BO to become available
 805  *
 806  * @busy_bo: BO which couldn't be locked with trylock
 807  * @ctx: operation context
 808  * @ticket: acquire ticket
 809  *
 810  * Try to lock a busy buffer object to avoid failing eviction.
 811  */
 812 static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
 813                                    struct ttm_operation_ctx *ctx,
 814                                    struct ww_acquire_ctx *ticket)
 815 {
 816         int r;
 817
 818         if (!busy_bo || !ticket)
 819                 return -EBUSY;
 820
 821         if (ctx->interruptible)
 822                 r = dma_resv_lock_interruptible(busy_bo->base.resv,
 823                                                           ticket);
 824         else
 825                 r = dma_resv_lock(busy_bo->base.resv, ticket);
 826
 827         /*
 828          * TODO: It would be better to keep the BO locked until allocation is at
 829          * least tried one more time, but that would mean a much larger rework
 830          * of TTM.
 831          */
 832         if (!r)
 833                 dma_resv_unlock(busy_bo->base.resv);
 834
 835         return r == -EDEADLK ? -EBUSY : r;
 836 }
 837
 838 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 839                                uint32_t mem_type,
 840                                const struct ttm_place *place,
 841                                struct ttm_operation_ctx *ctx,
 842                                struct ww_acquire_ctx *ticket)
 843 {
 844         struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
 845         struct ttm_bo_global *glob = bdev->glob;
 846         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 847         bool locked = false;
 848         unsigned i;
 849         int ret;
 850
 851         spin_lock(&glob->lru_lock);
 852         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 853                 list_for_each_entry(bo, &man->lru[i], lru) {
 854                         bool busy;
 855
 856                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
 857                                                             &busy)) {
 858                                 if (busy && !busy_bo && ticket !=
 859                                     dma_resv_locking_ctx(bo->base.resv))
 860                                         busy_bo = bo;
 861                                 continue;
 862                         }
 863
 864                         if (place && !bdev->driver->eviction_valuable(bo,
 865                                                                       place)) {
 866                                 if (locked)
 867                                         dma_resv_unlock(bo->base.resv);
 868                                 continue;
 869                         }
 870                         break;
 871                 }
 872
 873                 /* If the inner loop terminated early, we have our candidate */
 874                 if (&bo->lru != &man->lru[i])
 875                         break;
 876
 877                 bo = NULL;
 878         }
 879
 880         if (!bo) {
 881                 if (busy_bo)
 882                         kref_get(&busy_bo->list_kref);
 883                 spin_unlock(&glob->lru_lock);
 884                 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
 885                 if (busy_bo)
 886                         kref_put(&busy_bo->list_kref, ttm_bo_release_list);
 887                 return ret;
 888         }
 889
 890         kref_get(&bo->list_kref);
 891
 892         if (!list_empty(&bo->ddestroy)) {
 893                 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
 894                                           ctx->no_wait_gpu, locked);
 895                 kref_put(&bo->list_kref, ttm_bo_release_list);
 896                 return ret;
 897         }
 898
 899         ttm_bo_del_from_lru(bo);
 900         spin_unlock(&glob->lru_lock);
 901
 902         ret = ttm_bo_evict(bo, ctx);
 903         if (locked) {
 904                 ttm_bo_unreserve(bo);
 905         } else {
 906                 spin_lock(&glob->lru_lock);
 907                 ttm_bo_add_to_lru(bo);
 908                 spin_unlock(&glob->lru_lock);
 909         }
 910
 911         kref_put(&bo->list_kref, ttm_bo_release_list);
 912         return ret;
 913 }
 914
 915 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 916 {
 917         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 918
 919         if (mem->mm_node)
 920                 (*man->func->put_node)(man, mem);
 921 }
 922 EXPORT_SYMBOL(ttm_bo_mem_put);
 923
 924 /**
 925  * Add the last move fence to the BO and reserve a new shared slot.
 926  */
 927 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 928                                  struct ttm_mem_type_manager *man,
 929                                  struct ttm_mem_reg *mem)
 930 {
 931         struct dma_fence *fence;
 932         int ret;
 933
 934         spin_lock(&man->move_lock);
 935         fence = dma_fence_get(man->move);
 936         spin_unlock(&man->move_lock);
 937
 938         if (fence) {
 939                 dma_resv_add_shared_fence(bo->base.resv, fence);
 940
 941                 ret = dma_resv_reserve_shared(bo->base.resv, 1);
 942                 if (unlikely(ret)) {
 943                         dma_fence_put(fence);
 944                         return ret;
 945                 }
 946
 947                 dma_fence_put(bo->moving);
 948                 bo->moving = fence;
 949         }
 950
 951         return 0;
 952 }
 953
 954 /**
 955  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 956  * space, or we've evicted everything and there isn't enough space.
 957  */
 958 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 959                                   const struct ttm_place *place,
 960                                   struct ttm_mem_reg *mem,
 961                                   struct ttm_operation_ctx *ctx)
 962 {
 963         struct ttm_bo_device *bdev = bo->bdev;
 964         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 965         struct ww_acquire_ctx *ticket;
 966         int ret;
 967
 968         ticket = dma_resv_locking_ctx(bo->base.resv);
 969         do {
 970                 ret = (*man->func->get_node)(man, bo, place, mem);
 971                 if (unlikely(ret != 0))
 972                         return ret;
 973                 if (mem->mm_node)
 974                         break;
 975                 ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
 976                                           ticket);
 977                 if (unlikely(ret != 0))
 978                         return ret;
 979         } while (1);
 980
 981         return ttm_bo_add_move_fence(bo, man, mem);
 982 }
 983
 984 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 985                                       uint32_t cur_placement,
 986                                       uint32_t proposed_placement)
 987 {
 988         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 989         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 990
 991         /**
 992          * Keep current caching if possible.
 993          */
 994
 995         if ((cur_placement & caching) != 0)
 996                 result |= (cur_placement & caching);
 997         else if ((man->default_caching & caching) != 0)
 998                 result |= man->default_caching;
 999         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
1000                 result |= TTM_PL_FLAG_CACHED;
1001         else if ((TTM_PL_FLAG_WC & caching) != 0)
1002                 result |= TTM_PL_FLAG_WC;
1003         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
1004                 result |= TTM_PL_FLAG_UNCACHED;
1005
1006         return result;
1007 }
1008
1009 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1010                                  uint32_t mem_type,
1011                                  const struct ttm_place *place,
1012                                  uint32_t *masked_placement)
1013 {
1014         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1015
1016         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
1017                 return false;
1018
1019         if ((place->flags & man->available_caching) == 0)
1020                 return false;
1021
1022         cur_flags |= (place->flags & man->available_caching);
1023
1024         *masked_placement = cur_flags;
1025         return true;
1026 }
1027
1028 /**
1029  * ttm_bo_mem_placement - check if placement is compatible
1030  * @bo: BO to find memory for
1031  * @place: where to search
1032  * @mem: the memory object to fill in
1033  * @ctx: operation context
1034  *
1035  * Check if placement is compatible and fill in mem structure.
1036  * Returns -EBUSY if placement won't work or negative error code.
1037  * 0 when placement can be used.
1038  */
1039 static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
1040                                 const struct ttm_place *place,
1041                                 struct ttm_mem_reg *mem,
1042                                 struct ttm_operation_ctx *ctx)
1043 {
1044         struct ttm_bo_device *bdev = bo->bdev;
1045         uint32_t mem_type = TTM_PL_SYSTEM;
1046         struct ttm_mem_type_manager *man;
1047         uint32_t cur_flags = 0;
1048         int ret;
1049
1050         ret = ttm_mem_type_from_place(place, &mem_type);
1051         if (ret)
1052                 return ret;
1053
1054         man = &bdev->man[mem_type];
1055         if (!man->has_type || !man->use_type)
1056                 return -EBUSY;
1057
1058         if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1059                 return -EBUSY;
1060
1061         cur_flags = ttm_bo_select_caching(man, bo->mem.placement, cur_flags);
1062         /*
1063          * Use the access and other non-mapping-related flag bits from
1064          * the memory placement flags to the current flags
1065          */
1066         ttm_flag_masked(&cur_flags, place->flags, ~TTM_PL_MASK_MEMTYPE);
1067
1068         mem->mem_type = mem_type;
1069         mem->placement = cur_flags;
1070
1071         if (bo->mem.mem_type < mem_type && !list_empty(&bo->lru)) {
1072                 spin_lock(&bo->bdev->glob->lru_lock);
1073                 ttm_bo_del_from_lru(bo);
1074                 ttm_bo_add_mem_to_lru(bo, mem);
1075                 spin_unlock(&bo->bdev->glob->lru_lock);
1076         }
1077
1078         return 0;
1079 }
1080
1081 /**
1082  * Creates space for memory region @mem according to its type.
1083  *
1084  * This function first searches for free space in compatible memory types in
1085  * the priority order defined by the driver.  If free space isn't found, then
1086  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1087  * space.
1088  */
1089 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1090                         struct ttm_placement *placement,
1091                         struct ttm_mem_reg *mem,
1092                         struct ttm_operation_ctx *ctx)
1093 {
1094         struct ttm_bo_device *bdev = bo->bdev;
1095         bool type_found = false;
1096         int i, ret;
1097
1098         ret = dma_resv_reserve_shared(bo->base.resv, 1);
1099         if (unlikely(ret))
1100                 return ret;
1101
1102         mem->mm_node = NULL;
1103         for (i = 0; i < placement->num_placement; ++i) {
1104                 const struct ttm_place *place = &placement->placement[i];
1105                 struct ttm_mem_type_manager *man;
1106
1107                 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1108                 if (ret == -EBUSY)
1109                         continue;
1110                 if (ret)
1111                         goto error;
1112
1113                 type_found = true;
1114                 mem->mm_node = NULL;
1115                 if (mem->mem_type == TTM_PL_SYSTEM)
1116                         return 0;
1117
1118                 man = &bdev->man[mem->mem_type];
1119                 ret = (*man->func->get_node)(man, bo, place, mem);
1120                 if (unlikely(ret))
1121                         goto error;
1122
1123                 if (mem->mm_node) {
1124                         ret = ttm_bo_add_move_fence(bo, man, mem);
1125                         if (unlikely(ret)) {
1126                                 (*man->func->put_node)(man, mem);
1127                                 goto error;
1128                         }
1129                         return 0;
1130                 }
1131         }
1132
1133         for (i = 0; i < placement->num_busy_placement; ++i) {
1134                 const struct ttm_place *place = &placement->busy_placement[i];
1135
1136                 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1137                 if (ret == -EBUSY)
1138                         continue;
1139                 if (ret)
1140                         goto error;
1141
1142                 type_found = true;
1143                 mem->mm_node = NULL;
1144                 if (mem->mem_type == TTM_PL_SYSTEM)
1145                         return 0;
1146
1147                 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
1148                 if (ret == 0 && mem->mm_node)
1149                         return 0;
1150
1151                 if (ret && ret != -EBUSY)
1152                         goto error;
1153         }
1154
1155         ret = -ENOMEM;
1156         if (!type_found) {
1157                 pr_err(TTM_PFX "No compatible memory type found\n");
1158                 ret = -EINVAL;
1159         }
1160
1161 error:
1162         if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
1163                 spin_lock(&bo->bdev->glob->lru_lock);
1164                 ttm_bo_move_to_lru_tail(bo, NULL);
1165                 spin_unlock(&bo->bdev->glob->lru_lock);
1166         }
1167
1168         return ret;
1169 }
1170 EXPORT_SYMBOL(ttm_bo_mem_space);
1171
1172 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1173                               struct ttm_placement *placement,
1174                               struct ttm_operation_ctx *ctx)
1175 {
1176         int ret = 0;
1177         struct ttm_mem_reg mem;
1178
1179         dma_resv_assert_held(bo->base.resv);
1180
1181         mem.num_pages = bo->num_pages;
1182         mem.size = mem.num_pages << PAGE_SHIFT;
1183         mem.page_alignment = bo->mem.page_alignment;
1184         mem.bus.io_reserved_vm = false;
1185         mem.bus.io_reserved_count = 0;
1186         /*
1187          * Determine where to move the buffer.
1188          */
1189         ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1190         if (ret)
1191                 goto out_unlock;
1192         ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1193 out_unlock:
1194         if (ret && mem.mm_node)
1195                 ttm_bo_mem_put(bo, &mem);
1196         return ret;
1197 }
1198
1199 static bool ttm_bo_places_compat(const struct ttm_place *places,
1200                                  unsigned num_placement,
1201                                  struct ttm_mem_reg *mem,
1202                                  uint32_t *new_flags)
1203 {
1204         unsigned i;
1205
1206         for (i = 0; i < num_placement; i++) {
1207                 const struct ttm_place *heap = &places[i];
1208
1209                 if (mem->mm_node && (mem->start < heap->fpfn ||
1210                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1211                         continue;
1212
1213                 *new_flags = heap->flags;
1214                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1215                     (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1216                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1217                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1218                         return true;
1219         }
1220         return false;
1221 }
1222
1223 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1224                        struct ttm_mem_reg *mem,
1225                        uint32_t *new_flags)
1226 {
1227         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1228                                  mem, new_flags))
1229                 return true;
1230
1231         if ((placement->busy_placement != placement->placement ||
1232              placement->num_busy_placement > placement->num_placement) &&
1233             ttm_bo_places_compat(placement->busy_placement,
1234                                  placement->num_busy_placement,
1235                                  mem, new_flags))
1236                 return true;
1237
1238         return false;
1239 }
1240 EXPORT_SYMBOL(ttm_bo_mem_compat);
1241
1242 int ttm_bo_validate(struct ttm_buffer_object *bo,
1243                     struct ttm_placement *placement,
1244                     struct ttm_operation_ctx *ctx)
1245 {
1246         int ret;
1247         uint32_t new_flags;
1248
1249         dma_resv_assert_held(bo->base.resv);
1250         /*
1251          * Check whether we need to move buffer.
1252          */
1253         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1254                 ret = ttm_bo_move_buffer(bo, placement, ctx);
1255                 if (ret)
1256                         return ret;
1257         } else {
1258                 /*
1259                  * Use the access and other non-mapping-related flag bits from
1260                  * the compatible memory placement flags to the active flags
1261                  */
1262                 ttm_flag_masked(&bo->mem.placement, new_flags,
1263                                 ~TTM_PL_MASK_MEMTYPE);
1264         }
1265         /*
1266          * We might need to add a TTM.
1267          */
1268         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1269                 ret = ttm_tt_create(bo, true);
1270                 if (ret)
1271                         return ret;
1272         }
1273         return 0;
1274 }
1275 EXPORT_SYMBOL(ttm_bo_validate);
1276
1277 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1278                          struct ttm_buffer_object *bo,
1279                          unsigned long size,
1280                          enum ttm_bo_type type,
1281                          struct ttm_placement *placement,
1282                          uint32_t page_alignment,
1283                          struct ttm_operation_ctx *ctx,
1284                          size_t acc_size,
1285                          struct sg_table *sg,
1286                          struct dma_resv *resv,
1287                          void (*destroy) (struct ttm_buffer_object *))
1288 {
1289         int ret = 0;
1290         unsigned long num_pages;
1291         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1292         bool locked;
1293
1294         ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1295         if (ret) {
1296                 pr_err("Out of kernel memory\n");
1297                 if (destroy)
1298                         (*destroy)(bo);
1299                 else
1300                         kfree(bo);
1301                 return -ENOMEM;
1302         }
1303
1304         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1305         if (num_pages == 0) {
1306                 pr_err("Illegal buffer object size\n");
1307                 if (destroy)
1308                         (*destroy)(bo);
1309                 else
1310                         kfree(bo);
1311                 ttm_mem_global_free(mem_glob, acc_size);
1312                 return -EINVAL;
1313         }
1314         bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1315
1316         kref_init(&bo->kref);
1317         kref_init(&bo->list_kref);
1318         atomic_set(&bo->cpu_writers, 0);
1319         INIT_LIST_HEAD(&bo->lru);
1320         INIT_LIST_HEAD(&bo->ddestroy);
1321         INIT_LIST_HEAD(&bo->swap);
1322         INIT_LIST_HEAD(&bo->io_reserve_lru);
1323         mutex_init(&bo->wu_mutex);
1324         bo->bdev = bdev;
1325         bo->type = type;
1326         bo->num_pages = num_pages;
1327         bo->mem.size = num_pages << PAGE_SHIFT;
1328         bo->mem.mem_type = TTM_PL_SYSTEM;
1329         bo->mem.num_pages = bo->num_pages;
1330         bo->mem.mm_node = NULL;
1331         bo->mem.page_alignment = page_alignment;
1332         bo->mem.bus.io_reserved_vm = false;
1333         bo->mem.bus.io_reserved_count = 0;
1334         bo->moving = NULL;
1335         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1336         bo->acc_size = acc_size;
1337         bo->sg = sg;
1338         if (resv) {
1339                 bo->base.resv = resv;
1340                 dma_resv_assert_held(bo->base.resv);
1341         } else {
1342                 bo->base.resv = &bo->base._resv;
1343         }
1344         if (!ttm_bo_uses_embedded_gem_object(bo)) {
1345                 /*
1346                  * bo.gem is not initialized, so we have to setup the
1347                  * struct elements we want use regardless.
1348                  */
1349                 dma_resv_init(&bo->base._resv);
1350                 drm_vma_node_reset(&bo->base.vma_node);
1351         }
1352         atomic_inc(&bo->bdev->glob->bo_count);
1353
1354         /*
1355          * For ttm_bo_type_device buffers, allocate
1356          * address space from the device.
1357          */
1358         if (bo->type == ttm_bo_type_device ||
1359             bo->type == ttm_bo_type_sg)
1360                 ret = drm_vma_offset_add(bdev->vma_manager, &bo->base.vma_node,
1361                                          bo->mem.num_pages);
1362
1363         /* passed reservation objects should already be locked,
1364          * since otherwise lockdep will be angered in radeon.
1365          */
1366         if (!resv) {
1367                 locked = dma_resv_trylock(bo->base.resv);
1368                 WARN_ON(!locked);
1369         }
1370
1371         if (likely(!ret))
1372                 ret = ttm_bo_validate(bo, placement, ctx);
1373
1374         if (unlikely(ret)) {
1375                 if (!resv)
1376                         ttm_bo_unreserve(bo);
1377
1378                 ttm_bo_put(bo);
1379                 return ret;
1380         }
1381
1382         if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1383                 spin_lock(&bdev->glob->lru_lock);
1384                 ttm_bo_add_to_lru(bo);
1385                 spin_unlock(&bdev->glob->lru_lock);
1386         }
1387
1388         return ret;
1389 }
1390 EXPORT_SYMBOL(ttm_bo_init_reserved);
1391
1392 int ttm_bo_init(struct ttm_bo_device *bdev,
1393                 struct ttm_buffer_object *bo,
1394                 unsigned long size,
1395                 enum ttm_bo_type type,
1396                 struct ttm_placement *placement,
1397                 uint32_t page_alignment,
1398                 bool interruptible,
1399                 size_t acc_size,
1400                 struct sg_table *sg,
1401                 struct dma_resv *resv,
1402                 void (*destroy) (struct ttm_buffer_object *))
1403 {
1404         struct ttm_operation_ctx ctx = { interruptible, false };
1405         int ret;
1406
1407         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1408                                    page_alignment, &ctx, acc_size,
1409                                    sg, resv, destroy);
1410         if (ret)
1411                 return ret;
1412
1413         if (!resv)
1414                 ttm_bo_unreserve(bo);
1415
1416         return 0;
1417 }
1418 EXPORT_SYMBOL(ttm_bo_init);
1419
1420 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1421                        unsigned long bo_size,
1422                        unsigned struct_size)
1423 {
1424         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1425         size_t size = 0;
1426
1427         size += ttm_round_pot(struct_size);
1428         size += ttm_round_pot(npages * sizeof(void *));
1429         size += ttm_round_pot(sizeof(struct ttm_tt));
1430         return size;
1431 }
1432 EXPORT_SYMBOL(ttm_bo_acc_size);
1433
1434 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1435                            unsigned long bo_size,
1436                            unsigned struct_size)
1437 {
1438         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1439         size_t size = 0;
1440
1441         size += ttm_round_pot(struct_size);
1442         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1443         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1444         return size;
1445 }
1446 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1447
1448 int ttm_bo_create(struct ttm_bo_device *bdev,
1449                         unsigned long size,
1450                         enum ttm_bo_type type,
1451                         struct ttm_placement *placement,
1452                         uint32_t page_alignment,
1453                         bool interruptible,
1454                         struct ttm_buffer_object **p_bo)
1455 {
1456         struct ttm_buffer_object *bo;
1457         size_t acc_size;
1458         int ret;
1459
1460         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1461         if (unlikely(bo == NULL))
1462                 return -ENOMEM;
1463
1464         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1465         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1466                           interruptible, acc_size,
1467                           NULL, NULL, NULL);
1468         if (likely(ret == 0))
1469                 *p_bo = bo;
1470
1471         return ret;
1472 }
1473 EXPORT_SYMBOL(ttm_bo_create);
1474
1475 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1476                                    unsigned mem_type)
1477 {
1478         struct ttm_operation_ctx ctx = {
1479                 .interruptible = false,
1480                 .no_wait_gpu = false,
1481                 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1482         };
1483         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1484         struct ttm_bo_global *glob = bdev->glob;
1485         struct dma_fence *fence;
1486         int ret;
1487         unsigned i;
1488
1489         /*
1490          * Can't use standard list traversal since we're unlocking.
1491          */
1492
1493         spin_lock(&glob->lru_lock);
1494         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1495                 while (!list_empty(&man->lru[i])) {
1496                         spin_unlock(&glob->lru_lock);
1497                         ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx,
1498                                                   NULL);
1499                         if (ret)
1500                                 return ret;
1501                         spin_lock(&glob->lru_lock);
1502                 }
1503         }
1504         spin_unlock(&glob->lru_lock);
1505
1506         spin_lock(&man->move_lock);
1507         fence = dma_fence_get(man->move);
1508         spin_unlock(&man->move_lock);
1509
1510         if (fence) {
1511                 ret = dma_fence_wait(fence, false);
1512                 dma_fence_put(fence);
1513                 if (ret)
1514                         return ret;
1515         }
1516
1517         return 0;
1518 }
1519
1520 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1521 {
1522         struct ttm_mem_type_manager *man;
1523         int ret = -EINVAL;
1524
1525         if (mem_type >= TTM_NUM_MEM_TYPES) {
1526                 pr_err("Illegal memory type %d\n", mem_type);
1527                 return ret;
1528         }
1529         man = &bdev->man[mem_type];
1530
1531         if (!man->has_type) {
1532                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1533                        mem_type);
1534                 return ret;
1535         }
1536
1537         man->use_type = false;
1538         man->has_type = false;
1539
1540         ret = 0;
1541         if (mem_type > 0) {
1542                 ret = ttm_bo_force_list_clean(bdev, mem_type);
1543                 if (ret) {
1544                         pr_err("Cleanup eviction failed\n");
1545                         return ret;
1546                 }
1547
1548                 ret = (*man->func->takedown)(man);
1549         }
1550
1551         dma_fence_put(man->move);
1552         man->move = NULL;
1553
1554         return ret;
1555 }
1556 EXPORT_SYMBOL(ttm_bo_clean_mm);
1557
1558 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1559 {
1560         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1561
1562         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1563                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1564                 return -EINVAL;
1565         }
1566
1567         if (!man->has_type) {
1568                 pr_err("Memory type %u has not been initialized\n", mem_type);
1569                 return 0;
1570         }
1571
1572         return ttm_bo_force_list_clean(bdev, mem_type);
1573 }
1574 EXPORT_SYMBOL(ttm_bo_evict_mm);
1575
1576 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1577                         unsigned long p_size)
1578 {
1579         int ret;
1580         struct ttm_mem_type_manager *man;
1581         unsigned i;
1582
1583         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1584         man = &bdev->man[type];
1585         BUG_ON(man->has_type);
1586         man->io_reserve_fastpath = true;
1587         man->use_io_reserve_lru = false;
1588         mutex_init(&man->io_reserve_mutex);
1589         spin_lock_init(&man->move_lock);
1590         INIT_LIST_HEAD(&man->io_reserve_lru);
1591
1592         ret = bdev->driver->init_mem_type(bdev, type, man);
1593         if (ret)
1594                 return ret;
1595         man->bdev = bdev;
1596
1597         if (type != TTM_PL_SYSTEM) {
1598                 ret = (*man->func->init)(man, p_size);
1599                 if (ret)
1600                         return ret;
1601         }
1602         man->has_type = true;
1603         man->use_type = true;
1604         man->size = p_size;
1605
1606         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1607                 INIT_LIST_HEAD(&man->lru[i]);
1608         man->move = NULL;
1609
1610         return 0;
1611 }
1612 EXPORT_SYMBOL(ttm_bo_init_mm);
1613
1614 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1615 {
1616         struct ttm_bo_global *glob =
1617                 container_of(kobj, struct ttm_bo_global, kobj);
1618
1619         __free_page(glob->dummy_read_page);
1620 }
1621
1622 static void ttm_bo_global_release(void)
1623 {
1624         struct ttm_bo_global *glob = &ttm_bo_glob;
1625
1626         mutex_lock(&ttm_global_mutex);
1627         if (--ttm_bo_glob_use_count > 0)
1628                 goto out;
1629
1630         kobject_del(&glob->kobj);
1631         kobject_put(&glob->kobj);
1632         ttm_mem_global_release(&ttm_mem_glob);
1633         memset(glob, 0, sizeof(*glob));
1634 out:
1635         mutex_unlock(&ttm_global_mutex);
1636 }
1637
1638 static int ttm_bo_global_init(void)
1639 {
1640         struct ttm_bo_global *glob = &ttm_bo_glob;
1641         int ret = 0;
1642         unsigned i;
1643
1644         mutex_lock(&ttm_global_mutex);
1645         if (++ttm_bo_glob_use_count > 1)
1646                 goto out;
1647
1648         ret = ttm_mem_global_init(&ttm_mem_glob);
1649         if (ret)
1650                 goto out;
1651
1652         spin_lock_init(&glob->lru_lock);
1653         glob->mem_glob = &ttm_mem_glob;
1654         glob->mem_glob->bo_glob = glob;
1655         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1656
1657         if (unlikely(glob->dummy_read_page == NULL)) {
1658                 ret = -ENOMEM;
1659                 goto out;
1660         }
1661
1662         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1663                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1664         INIT_LIST_HEAD(&glob->device_list);
1665         atomic_set(&glob->bo_count, 0);
1666
1667         ret = kobject_init_and_add(
1668                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1669         if (unlikely(ret != 0))
1670                 kobject_put(&glob->kobj);
1671 out:
1672         mutex_unlock(&ttm_global_mutex);
1673         return ret;
1674 }
1675
1676 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1677 {
1678         int ret = 0;
1679         unsigned i = TTM_NUM_MEM_TYPES;
1680         struct ttm_mem_type_manager *man;
1681         struct ttm_bo_global *glob = bdev->glob;
1682
1683         while (i--) {
1684                 man = &bdev->man[i];
1685                 if (man->has_type) {
1686                         man->use_type = false;
1687                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1688                                 ret = -EBUSY;
1689                                 pr_err("DRM memory manager type %d is not clean\n",
1690                                        i);
1691                         }
1692                         man->has_type = false;
1693                 }
1694         }
1695
1696         mutex_lock(&ttm_global_mutex);
1697         list_del(&bdev->device_list);
1698         mutex_unlock(&ttm_global_mutex);
1699
1700         cancel_delayed_work_sync(&bdev->wq);
1701
1702         if (ttm_bo_delayed_delete(bdev, true))
1703                 pr_debug("Delayed destroy list was clean\n");
1704
1705         spin_lock(&glob->lru_lock);
1706         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1707                 if (list_empty(&bdev->man[0].lru[0]))
1708                         pr_debug("Swap list %d was clean\n", i);
1709         spin_unlock(&glob->lru_lock);
1710
1711         if (!ret)
1712                 ttm_bo_global_release();
1713
1714         return ret;
1715 }
1716 EXPORT_SYMBOL(ttm_bo_device_release);
1717
1718 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1719                        struct ttm_bo_driver *driver,
1720                        struct address_space *mapping,
1721                        struct drm_vma_offset_manager *vma_manager,
1722                        bool need_dma32)
1723 {
1724         struct ttm_bo_global *glob = &ttm_bo_glob;
1725         int ret;
1726
1727         if (WARN_ON(vma_manager == NULL))
1728                 return -EINVAL;
1729
1730         ret = ttm_bo_global_init();
1731         if (ret)
1732                 return ret;
1733
1734         bdev->driver = driver;
1735
1736         memset(bdev->man, 0, sizeof(bdev->man));
1737
1738         /*
1739          * Initialize the system memory buffer type.
1740          * Other types need to be driver / IOCTL initialized.
1741          */
1742         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1743         if (unlikely(ret != 0))
1744                 goto out_no_sys;
1745
1746         bdev->vma_manager = vma_manager;
1747         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1748         INIT_LIST_HEAD(&bdev->ddestroy);
1749         bdev->dev_mapping = mapping;
1750         bdev->glob = glob;
1751         bdev->need_dma32 = need_dma32;
1752         mutex_lock(&ttm_global_mutex);
1753         list_add_tail(&bdev->device_list, &glob->device_list);
1754         mutex_unlock(&ttm_global_mutex);
1755
1756         return 0;
1757 out_no_sys:
1758         ttm_bo_global_release();
1759         return ret;
1760 }
1761 EXPORT_SYMBOL(ttm_bo_device_init);
1762
1763 /*
1764  * buffer object vm functions.
1765  */
1766
1767 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1768 {
1769         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1770
1771         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1772                 if (mem->mem_type == TTM_PL_SYSTEM)
1773                         return false;
1774
1775                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1776                         return false;
1777
1778                 if (mem->placement & TTM_PL_FLAG_CACHED)
1779                         return false;
1780         }
1781         return true;
1782 }
1783
1784 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1785 {
1786         struct ttm_bo_device *bdev = bo->bdev;
1787
1788         drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1789         ttm_mem_io_free_vm(bo);
1790 }
1791
1792 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1793 {
1794         struct ttm_bo_device *bdev = bo->bdev;
1795         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1796
1797         ttm_mem_io_lock(man, false);
1798         ttm_bo_unmap_virtual_locked(bo);
1799         ttm_mem_io_unlock(man);
1800 }
1801
1802
1803 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1804
1805 int ttm_bo_wait(struct ttm_buffer_object *bo,
1806                 bool interruptible, bool no_wait)
1807 {
1808         long timeout = 15 * HZ;
1809
1810         if (no_wait) {
1811                 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1812                         return 0;
1813                 else
1814                         return -EBUSY;
1815         }
1816
1817         timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1818                                                       interruptible, timeout);
1819         if (timeout < 0)
1820                 return timeout;
1821
1822         if (timeout == 0)
1823                 return -EBUSY;
1824
1825         dma_resv_add_excl_fence(bo->base.resv, NULL);
1826         return 0;
1827 }
1828 EXPORT_SYMBOL(ttm_bo_wait);
1829
1830 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1831 {
1832         int ret = 0;
1833
1834         /*
1835          * Using ttm_bo_reserve makes sure the lru lists are updated.
1836          */
1837
1838         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1839         if (unlikely(ret != 0))
1840                 return ret;
1841         ret = ttm_bo_wait(bo, true, no_wait);
1842         if (likely(ret == 0))
1843                 atomic_inc(&bo->cpu_writers);
1844         ttm_bo_unreserve(bo);
1845         return ret;
1846 }
1847 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1848
1849 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1850 {
1851         atomic_dec(&bo->cpu_writers);
1852 }
1853 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1854
1855 /**
1856  * A buffer object shrink method that tries to swap out the first
1857  * buffer object on the bo_global::swap_lru list.
1858  */
1859 int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1860 {
1861         struct ttm_buffer_object *bo;
1862         int ret = -EBUSY;
1863         bool locked;
1864         unsigned i;
1865
1866         spin_lock(&glob->lru_lock);
1867         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1868                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1869                         if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1870                                                            NULL)) {
1871                                 ret = 0;
1872                                 break;
1873                         }
1874                 }
1875                 if (!ret)
1876                         break;
1877         }
1878
1879         if (ret) {
1880                 spin_unlock(&glob->lru_lock);
1881                 return ret;
1882         }
1883
1884         kref_get(&bo->list_kref);
1885
1886         if (!list_empty(&bo->ddestroy)) {
1887                 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1888                 kref_put(&bo->list_kref, ttm_bo_release_list);
1889                 return ret;
1890         }
1891
1892         ttm_bo_del_from_lru(bo);
1893         spin_unlock(&glob->lru_lock);
1894
1895         /**
1896          * Move to system cached
1897          */
1898
1899         if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1900             bo->ttm->caching_state != tt_cached) {
1901                 struct ttm_operation_ctx ctx = { false, false };
1902                 struct ttm_mem_reg evict_mem;
1903
1904                 evict_mem = bo->mem;
1905                 evict_mem.mm_node = NULL;
1906                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1907                 evict_mem.mem_type = TTM_PL_SYSTEM;
1908
1909                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1910                 if (unlikely(ret != 0))
1911                         goto out;
1912         }
1913
1914         /**
1915          * Make sure BO is idle.
1916          */
1917
1918         ret = ttm_bo_wait(bo, false, false);
1919         if (unlikely(ret != 0))
1920                 goto out;
1921
1922         ttm_bo_unmap_virtual(bo);
1923
1924         /**
1925          * Swap out. Buffer will be swapped in again as soon as
1926          * anyone tries to access a ttm page.
1927          */
1928
1929         if (bo->bdev->driver->swap_notify)
1930                 bo->bdev->driver->swap_notify(bo);
1931
1932         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1933 out:
1934
1935         /**
1936          *
1937          * Unreserve without putting on LRU to avoid swapping out an
1938          * already swapped buffer.
1939          */
1940         if (locked)
1941                 dma_resv_unlock(bo->base.resv);
1942         kref_put(&bo->list_kref, ttm_bo_release_list);
1943         return ret;
1944 }
1945 EXPORT_SYMBOL(ttm_bo_swapout);
1946
1947 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1948 {
1949         struct ttm_operation_ctx ctx = {
1950                 .interruptible = false,
1951                 .no_wait_gpu = false
1952         };
1953
1954         while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1955                 ;
1956 }
1957 EXPORT_SYMBOL(ttm_bo_swapout_all);
1958
1959 /**
1960  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1961  * unreserved
1962  *
1963  * @bo: Pointer to buffer
1964  */
1965 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1966 {
1967         int ret;
1968
1969         /*
1970          * In the absense of a wait_unlocked API,
1971          * Use the bo::wu_mutex to avoid triggering livelocks due to
1972          * concurrent use of this function. Note that this use of
1973          * bo::wu_mutex can go away if we change locking order to
1974          * mmap_sem -> bo::reserve.
1975          */
1976         ret = mutex_lock_interruptible(&bo->wu_mutex);
1977         if (unlikely(ret != 0))
1978                 return -ERESTARTSYS;
1979         if (!dma_resv_is_locked(bo->base.resv))
1980                 goto out_unlock;
1981         ret = dma_resv_lock_interruptible(bo->base.resv, NULL);
1982         if (ret == -EINTR)
1983                 ret = -ERESTARTSYS;
1984         if (unlikely(ret != 0))
1985                 goto out_unlock;
1986         dma_resv_unlock(bo->base.resv);
1987
1988 out_unlock:
1989         mutex_unlock(&bo->wu_mutex);
1990         return ret;
1991 }