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