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_bo_driver.h>
  35 #include <drm/ttm/ttm_placement.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/slab.h>
  38 #include <linux/sched.h>
  39 #include <linux/mm.h>
  40 #include <linux/file.h>
  41 #include <linux/module.h>
  42 #include <linux/atomic.h>
  43 #include <linux/dma-resv.h>
  44
  45 #include "ttm_module.h"
  46
  47 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  48
  49 /*
  50  * ttm_global_mutex - protecting the global BO state
  51  */
  52 DEFINE_MUTEX(ttm_global_mutex);
  53 unsigned ttm_bo_glob_use_count;
  54 struct ttm_bo_global ttm_bo_glob;
  55 EXPORT_SYMBOL(ttm_bo_glob);
  56
  57 static struct attribute ttm_bo_count = {
  58         .name = "bo_count",
  59         .mode = S_IRUGO
  60 };
  61
  62 /* default destructor */
  63 static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
  64 {
  65         kfree(bo);
  66 }
  67
  68 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  69                                         struct ttm_placement *placement)
  70 {
  71         struct drm_printer p = drm_debug_printer(TTM_PFX);
  72         struct ttm_resource_manager *man;
  73         int i, mem_type;
  74
  75         drm_printf(&p, "No space for %p (%lu pages, %zuK, %zuM)\n",
  76                    bo, bo->mem.num_pages, bo->base.size >> 10,
  77                    bo->base.size >> 20);
  78         for (i = 0; i < placement->num_placement; i++) {
  79                 mem_type = placement->placement[i].mem_type;
  80                 drm_printf(&p, "  placement[%d]=0x%08X (%d)\n",
  81                            i, placement->placement[i].flags, mem_type);
  82                 man = ttm_manager_type(bo->bdev, mem_type);
  83                 ttm_resource_manager_debug(man, &p);
  84         }
  85 }
  86
  87 static ssize_t ttm_bo_global_show(struct kobject *kobj,
  88                                   struct attribute *attr,
  89                                   char *buffer)
  90 {
  91         struct ttm_bo_global *glob =
  92                 container_of(kobj, struct ttm_bo_global, kobj);
  93
  94         return snprintf(buffer, PAGE_SIZE, "%d\n",
  95                                 atomic_read(&glob->bo_count));
  96 }
  97
  98 static struct attribute *ttm_bo_global_attrs[] = {
  99         &ttm_bo_count,
 100         NULL
 101 };
 102
 103 static const struct sysfs_ops ttm_bo_global_ops = {
 104         .show = &ttm_bo_global_show
 105 };
 106
 107 static struct kobj_type ttm_bo_glob_kobj_type  = {
 108         .release = &ttm_bo_global_kobj_release,
 109         .sysfs_ops = &ttm_bo_global_ops,
 110         .default_attrs = ttm_bo_global_attrs
 111 };
 112
 113 static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 114 {
 115         struct ttm_bo_device *bdev = bo->bdev;
 116
 117         list_del_init(&bo->swap);
 118         list_del_init(&bo->lru);
 119
 120         if (bdev->driver->del_from_lru_notify)
 121                 bdev->driver->del_from_lru_notify(bo);
 122 }
 123
 124 static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
 125                                      struct ttm_buffer_object *bo)
 126 {
 127         if (!pos->first)
 128                 pos->first = bo;
 129         pos->last = bo;
 130 }
 131
 132 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 133                              struct ttm_resource *mem,
 134                              struct ttm_lru_bulk_move *bulk)
 135 {
 136         struct ttm_bo_device *bdev = bo->bdev;
 137         struct ttm_resource_manager *man;
 138
 139         dma_resv_assert_held(bo->base.resv);
 140
 141         if (bo->pin_count)
 142                 return;
 143
 144         man = ttm_manager_type(bdev, mem->mem_type);
 145         list_move_tail(&bo->lru, &man->lru[bo->priority]);
 146         if (man->use_tt && bo->ttm &&
 147             !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
 148                                      TTM_PAGE_FLAG_SWAPPED))) {
 149                 struct list_head *swap;
 150
 151                 swap = &ttm_bo_glob.swap_lru[bo->priority];
 152                 list_move_tail(&bo->swap, swap);
 153         }
 154
 155         if (bdev->driver->del_from_lru_notify)
 156                 bdev->driver->del_from_lru_notify(bo);
 157
 158         if (bulk && !bo->pin_count) {
 159                 switch (bo->mem.mem_type) {
 160                 case TTM_PL_TT:
 161                         ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
 162                         break;
 163
 164                 case TTM_PL_VRAM:
 165                         ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
 166                         break;
 167                 }
 168                 if (bo->ttm && !(bo->ttm->page_flags &
 169                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
 170                         ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
 171         }
 172 }
 173 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 174
 175 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
 176 {
 177         unsigned i;
 178
 179         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 180                 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
 181                 struct ttm_resource_manager *man;
 182
 183                 if (!pos->first)
 184                         continue;
 185
 186                 dma_resv_assert_held(pos->first->base.resv);
 187                 dma_resv_assert_held(pos->last->base.resv);
 188
 189                 man = ttm_manager_type(pos->first->bdev, TTM_PL_TT);
 190                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 191                                     &pos->last->lru);
 192         }
 193
 194         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 195                 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
 196                 struct ttm_resource_manager *man;
 197
 198                 if (!pos->first)
 199                         continue;
 200
 201                 dma_resv_assert_held(pos->first->base.resv);
 202                 dma_resv_assert_held(pos->last->base.resv);
 203
 204                 man = ttm_manager_type(pos->first->bdev, TTM_PL_VRAM);
 205                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 206                                     &pos->last->lru);
 207         }
 208
 209         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 210                 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
 211                 struct list_head *lru;
 212
 213                 if (!pos->first)
 214                         continue;
 215
 216                 dma_resv_assert_held(pos->first->base.resv);
 217                 dma_resv_assert_held(pos->last->base.resv);
 218
 219                 lru = &ttm_bo_glob.swap_lru[i];
 220                 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
 221         }
 222 }
 223 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
 224
 225 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 226                                   struct ttm_resource *mem, bool evict,
 227                                   struct ttm_operation_ctx *ctx,
 228                                   struct ttm_place *hop)
 229 {
 230         struct ttm_bo_device *bdev = bo->bdev;
 231         struct ttm_resource_manager *old_man = ttm_manager_type(bdev, bo->mem.mem_type);
 232         struct ttm_resource_manager *new_man = ttm_manager_type(bdev, mem->mem_type);
 233         int ret;
 234
 235         ttm_bo_unmap_virtual(bo);
 236
 237         /*
 238          * Create and bind a ttm if required.
 239          */
 240
 241         if (new_man->use_tt) {
 242                 /* Zero init the new TTM structure if the old location should
 243                  * have used one as well.
 244                  */
 245                 ret = ttm_tt_create(bo, old_man->use_tt);
 246                 if (ret)
 247                         goto out_err;
 248
 249                 if (mem->mem_type != TTM_PL_SYSTEM) {
 250                         ret = ttm_tt_populate(bo->bdev, bo->ttm, ctx);
 251                         if (ret)
 252                                 goto out_err;
 253                 }
 254         }
 255
 256         ret = bdev->driver->move(bo, evict, ctx, mem, hop);
 257         if (ret) {
 258                 if (ret == -EMULTIHOP)
 259                         return ret;
 260                 goto out_err;
 261         }
 262
 263         ctx->bytes_moved += bo->base.size;
 264         return 0;
 265
 266 out_err:
 267         new_man = ttm_manager_type(bdev, bo->mem.mem_type);
 268         if (!new_man->use_tt)
 269                 ttm_bo_tt_destroy(bo);
 270
 271         return ret;
 272 }
 273
 274 /*
 275  * Call bo::reserved.
 276  * Will release GPU memory type usage on destruction.
 277  * This is the place to put in driver specific hooks to release
 278  * driver private resources.
 279  * Will release the bo::reserved lock.
 280  */
 281
 282 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 283 {
 284         if (bo->bdev->driver->delete_mem_notify)
 285                 bo->bdev->driver->delete_mem_notify(bo);
 286
 287         ttm_bo_tt_destroy(bo);
 288         ttm_resource_free(bo, &bo->mem);
 289 }
 290
 291 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 292 {
 293         int r;
 294
 295         if (bo->base.resv == &bo->base._resv)
 296                 return 0;
 297
 298         BUG_ON(!dma_resv_trylock(&bo->base._resv));
 299
 300         r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
 301         dma_resv_unlock(&bo->base._resv);
 302         if (r)
 303                 return r;
 304
 305         if (bo->type != ttm_bo_type_sg) {
 306                 /* This works because the BO is about to be destroyed and nobody
 307                  * reference it any more. The only tricky case is the trylock on
 308                  * the resv object while holding the lru_lock.
 309                  */
 310                 spin_lock(&ttm_bo_glob.lru_lock);
 311                 bo->base.resv = &bo->base._resv;
 312                 spin_unlock(&ttm_bo_glob.lru_lock);
 313         }
 314
 315         return r;
 316 }
 317
 318 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 319 {
 320         struct dma_resv *resv = &bo->base._resv;
 321         struct dma_resv_list *fobj;
 322         struct dma_fence *fence;
 323         int i;
 324
 325         rcu_read_lock();
 326         fobj = rcu_dereference(resv->fence);
 327         fence = rcu_dereference(resv->fence_excl);
 328         if (fence && !fence->ops->signaled)
 329                 dma_fence_enable_sw_signaling(fence);
 330
 331         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 332                 fence = rcu_dereference(fobj->shared[i]);
 333
 334                 if (!fence->ops->signaled)
 335                         dma_fence_enable_sw_signaling(fence);
 336         }
 337         rcu_read_unlock();
 338 }
 339
 340 /**
 341  * function ttm_bo_cleanup_refs
 342  * If bo idle, remove from lru lists, and unref.
 343  * If not idle, block if possible.
 344  *
 345  * Must be called with lru_lock and reservation held, this function
 346  * will drop the lru lock and optionally the reservation lock before returning.
 347  *
 348  * @bo:                    The buffer object to clean-up
 349  * @interruptible:         Any sleeps should occur interruptibly.
 350  * @no_wait_gpu:           Never wait for gpu. Return -EBUSY instead.
 351  * @unlock_resv:           Unlock the reservation lock as well.
 352  */
 353
 354 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 355                                bool interruptible, bool no_wait_gpu,
 356                                bool unlock_resv)
 357 {
 358         struct dma_resv *resv = &bo->base._resv;
 359         int ret;
 360
 361         if (dma_resv_test_signaled_rcu(resv, true))
 362                 ret = 0;
 363         else
 364                 ret = -EBUSY;
 365
 366         if (ret && !no_wait_gpu) {
 367                 long lret;
 368
 369                 if (unlock_resv)
 370                         dma_resv_unlock(bo->base.resv);
 371                 spin_unlock(&ttm_bo_glob.lru_lock);
 372
 373                 lret = dma_resv_wait_timeout_rcu(resv, true, interruptible,
 374                                                  30 * HZ);
 375
 376                 if (lret < 0)
 377                         return lret;
 378                 else if (lret == 0)
 379                         return -EBUSY;
 380
 381                 spin_lock(&ttm_bo_glob.lru_lock);
 382                 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
 383                         /*
 384                          * We raced, and lost, someone else holds the reservation now,
 385                          * and is probably busy in ttm_bo_cleanup_memtype_use.
 386                          *
 387                          * Even if it's not the case, because we finished waiting any
 388                          * delayed destruction would succeed, so just return success
 389                          * here.
 390                          */
 391                         spin_unlock(&ttm_bo_glob.lru_lock);
 392                         return 0;
 393                 }
 394                 ret = 0;
 395         }
 396
 397         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 398                 if (unlock_resv)
 399                         dma_resv_unlock(bo->base.resv);
 400                 spin_unlock(&ttm_bo_glob.lru_lock);
 401                 return ret;
 402         }
 403
 404         ttm_bo_del_from_lru(bo);
 405         list_del_init(&bo->ddestroy);
 406         spin_unlock(&ttm_bo_glob.lru_lock);
 407         ttm_bo_cleanup_memtype_use(bo);
 408
 409         if (unlock_resv)
 410                 dma_resv_unlock(bo->base.resv);
 411
 412         ttm_bo_put(bo);
 413
 414         return 0;
 415 }
 416
 417 /*
 418  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 419  * encountered buffers.
 420  */
 421 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 422 {
 423         struct ttm_bo_global *glob = &ttm_bo_glob;
 424         struct list_head removed;
 425         bool empty;
 426
 427         INIT_LIST_HEAD(&removed);
 428
 429         spin_lock(&glob->lru_lock);
 430         while (!list_empty(&bdev->ddestroy)) {
 431                 struct ttm_buffer_object *bo;
 432
 433                 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
 434                                       ddestroy);
 435                 list_move_tail(&bo->ddestroy, &removed);
 436                 if (!ttm_bo_get_unless_zero(bo))
 437                         continue;
 438
 439                 if (remove_all || bo->base.resv != &bo->base._resv) {
 440                         spin_unlock(&glob->lru_lock);
 441                         dma_resv_lock(bo->base.resv, NULL);
 442
 443                         spin_lock(&glob->lru_lock);
 444                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 445
 446                 } else if (dma_resv_trylock(bo->base.resv)) {
 447                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 448                 } else {
 449                         spin_unlock(&glob->lru_lock);
 450                 }
 451
 452                 ttm_bo_put(bo);
 453                 spin_lock(&glob->lru_lock);
 454         }
 455         list_splice_tail(&removed, &bdev->ddestroy);
 456         empty = list_empty(&bdev->ddestroy);
 457         spin_unlock(&glob->lru_lock);
 458
 459         return empty;
 460 }
 461
 462 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 463 {
 464         struct ttm_bo_device *bdev =
 465             container_of(work, struct ttm_bo_device, wq.work);
 466
 467         if (!ttm_bo_delayed_delete(bdev, false))
 468                 schedule_delayed_work(&bdev->wq,
 469                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 470 }
 471
 472 static void ttm_bo_release(struct kref *kref)
 473 {
 474         struct ttm_buffer_object *bo =
 475             container_of(kref, struct ttm_buffer_object, kref);
 476         struct ttm_bo_device *bdev = bo->bdev;
 477         size_t acc_size = bo->acc_size;
 478         int ret;
 479
 480         if (!bo->deleted) {
 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                 }
 489
 490                 if (bo->bdev->driver->release_notify)
 491                         bo->bdev->driver->release_notify(bo);
 492
 493                 drm_vma_offset_remove(bdev->vma_manager, &bo->base.vma_node);
 494                 ttm_mem_io_free(bdev, &bo->mem);
 495         }
 496
 497         if (!dma_resv_test_signaled_rcu(bo->base.resv, true) ||
 498             !dma_resv_trylock(bo->base.resv)) {
 499                 /* The BO is not idle, resurrect it for delayed destroy */
 500                 ttm_bo_flush_all_fences(bo);
 501                 bo->deleted = true;
 502
 503                 spin_lock(&ttm_bo_glob.lru_lock);
 504
 505                 /*
 506                  * Make pinned bos immediately available to
 507                  * shrinkers, now that they are queued for
 508                  * destruction.
 509                  */
 510                 if (WARN_ON(bo->pin_count)) {
 511                         bo->pin_count = 0;
 512                         ttm_bo_move_to_lru_tail(bo, &bo->mem, NULL);
 513                 }
 514
 515                 kref_init(&bo->kref);
 516                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 517                 spin_unlock(&ttm_bo_glob.lru_lock);
 518
 519                 schedule_delayed_work(&bdev->wq,
 520                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 521                 return;
 522         }
 523
 524         spin_lock(&ttm_bo_glob.lru_lock);
 525         ttm_bo_del_from_lru(bo);
 526         list_del(&bo->ddestroy);
 527         spin_unlock(&ttm_bo_glob.lru_lock);
 528
 529         ttm_bo_cleanup_memtype_use(bo);
 530         dma_resv_unlock(bo->base.resv);
 531
 532         atomic_dec(&ttm_bo_glob.bo_count);
 533         dma_fence_put(bo->moving);
 534         if (!ttm_bo_uses_embedded_gem_object(bo))
 535                 dma_resv_fini(&bo->base._resv);
 536         bo->destroy(bo);
 537         ttm_mem_global_free(&ttm_mem_glob, acc_size);
 538 }
 539
 540 void ttm_bo_put(struct ttm_buffer_object *bo)
 541 {
 542         kref_put(&bo->kref, ttm_bo_release);
 543 }
 544 EXPORT_SYMBOL(ttm_bo_put);
 545
 546 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 547 {
 548         return cancel_delayed_work_sync(&bdev->wq);
 549 }
 550 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 551
 552 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 553 {
 554         if (resched)
 555                 schedule_delayed_work(&bdev->wq,
 556                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 557 }
 558 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 559
 560 static int ttm_bo_evict(struct ttm_buffer_object *bo,
 561                         struct ttm_operation_ctx *ctx)
 562 {
 563         struct ttm_bo_device *bdev = bo->bdev;
 564         struct ttm_resource evict_mem;
 565         struct ttm_placement placement;
 566         struct ttm_place hop;
 567         int ret = 0;
 568
 569         memset(&hop, 0, sizeof(hop));
 570
 571         dma_resv_assert_held(bo->base.resv);
 572
 573         placement.num_placement = 0;
 574         placement.num_busy_placement = 0;
 575         bdev->driver->evict_flags(bo, &placement);
 576
 577         if (!placement.num_placement && !placement.num_busy_placement) {
 578                 ttm_bo_wait(bo, false, false);
 579
 580                 ttm_bo_cleanup_memtype_use(bo);
 581                 return ttm_tt_create(bo, false);
 582         }
 583
 584         evict_mem = bo->mem;
 585         evict_mem.mm_node = NULL;
 586         evict_mem.bus.offset = 0;
 587         evict_mem.bus.addr = NULL;
 588
 589         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 590         if (ret) {
 591                 if (ret != -ERESTARTSYS) {
 592                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 593                                bo);
 594                         ttm_bo_mem_space_debug(bo, &placement);
 595                 }
 596                 goto out;
 597         }
 598
 599         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx, &hop);
 600         if (unlikely(ret)) {
 601                 WARN(ret == -EMULTIHOP, "Unexpected multihop in eviction - likely driver bug\n");
 602                 if (ret != -ERESTARTSYS)
 603                         pr_err("Buffer eviction failed\n");
 604                 ttm_resource_free(bo, &evict_mem);
 605         }
 606 out:
 607         return ret;
 608 }
 609
 610 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 611                               const struct ttm_place *place)
 612 {
 613         /* Don't evict this BO if it's outside of the
 614          * requested placement range
 615          */
 616         if (place->fpfn >= (bo->mem.start + bo->mem.num_pages) ||
 617             (place->lpfn && place->lpfn <= bo->mem.start))
 618                 return false;
 619
 620         return true;
 621 }
 622 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 623
 624 /*
 625  * Check the target bo is allowable to be evicted or swapout, including cases:
 626  *
 627  * a. if share same reservation object with ctx->resv, have assumption
 628  * reservation objects should already be locked, so not lock again and
 629  * return true directly when either the opreation allow_reserved_eviction
 630  * or the target bo already is in delayed free list;
 631  *
 632  * b. Otherwise, trylock it.
 633  */
 634 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 635                         struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
 636 {
 637         bool ret = false;
 638
 639         if (bo->base.resv == ctx->resv) {
 640                 dma_resv_assert_held(bo->base.resv);
 641                 if (ctx->allow_res_evict)
 642                         ret = true;
 643                 *locked = false;
 644                 if (busy)
 645                         *busy = false;
 646         } else {
 647                 ret = dma_resv_trylock(bo->base.resv);
 648                 *locked = ret;
 649                 if (busy)
 650                         *busy = !ret;
 651         }
 652
 653         return ret;
 654 }
 655
 656 /**
 657  * ttm_mem_evict_wait_busy - wait for a busy BO to become available
 658  *
 659  * @busy_bo: BO which couldn't be locked with trylock
 660  * @ctx: operation context
 661  * @ticket: acquire ticket
 662  *
 663  * Try to lock a busy buffer object to avoid failing eviction.
 664  */
 665 static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
 666                                    struct ttm_operation_ctx *ctx,
 667                                    struct ww_acquire_ctx *ticket)
 668 {
 669         int r;
 670
 671         if (!busy_bo || !ticket)
 672                 return -EBUSY;
 673
 674         if (ctx->interruptible)
 675                 r = dma_resv_lock_interruptible(busy_bo->base.resv,
 676                                                           ticket);
 677         else
 678                 r = dma_resv_lock(busy_bo->base.resv, ticket);
 679
 680         /*
 681          * TODO: It would be better to keep the BO locked until allocation is at
 682          * least tried one more time, but that would mean a much larger rework
 683          * of TTM.
 684          */
 685         if (!r)
 686                 dma_resv_unlock(busy_bo->base.resv);
 687
 688         return r == -EDEADLK ? -EBUSY : r;
 689 }
 690
 691 int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 692                         struct ttm_resource_manager *man,
 693                         const struct ttm_place *place,
 694                         struct ttm_operation_ctx *ctx,
 695                         struct ww_acquire_ctx *ticket)
 696 {
 697         struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
 698         bool locked = false;
 699         unsigned i;
 700         int ret;
 701
 702         spin_lock(&ttm_bo_glob.lru_lock);
 703         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 704                 list_for_each_entry(bo, &man->lru[i], lru) {
 705                         bool busy;
 706
 707                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
 708                                                             &busy)) {
 709                                 if (busy && !busy_bo && ticket !=
 710                                     dma_resv_locking_ctx(bo->base.resv))
 711                                         busy_bo = bo;
 712                                 continue;
 713                         }
 714
 715                         if (place && !bdev->driver->eviction_valuable(bo,
 716                                                                       place)) {
 717                                 if (locked)
 718                                         dma_resv_unlock(bo->base.resv);
 719                                 continue;
 720                         }
 721                         if (!ttm_bo_get_unless_zero(bo)) {
 722                                 if (locked)
 723                                         dma_resv_unlock(bo->base.resv);
 724                                 continue;
 725                         }
 726                         break;
 727                 }
 728
 729                 /* If the inner loop terminated early, we have our candidate */
 730                 if (&bo->lru != &man->lru[i])
 731                         break;
 732
 733                 bo = NULL;
 734         }
 735
 736         if (!bo) {
 737                 if (busy_bo && !ttm_bo_get_unless_zero(busy_bo))
 738                         busy_bo = NULL;
 739                 spin_unlock(&ttm_bo_glob.lru_lock);
 740                 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
 741                 if (busy_bo)
 742                         ttm_bo_put(busy_bo);
 743                 return ret;
 744         }
 745
 746         if (bo->deleted) {
 747                 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
 748                                           ctx->no_wait_gpu, locked);
 749                 ttm_bo_put(bo);
 750                 return ret;
 751         }
 752
 753         spin_unlock(&ttm_bo_glob.lru_lock);
 754
 755         ret = ttm_bo_evict(bo, ctx);
 756         if (locked)
 757                 ttm_bo_unreserve(bo);
 758
 759         ttm_bo_put(bo);
 760         return ret;
 761 }
 762
 763 /*
 764  * Add the last move fence to the BO and reserve a new shared slot.
 765  */
 766 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 767                                  struct ttm_resource_manager *man,
 768                                  struct ttm_resource *mem,
 769                                  bool no_wait_gpu)
 770 {
 771         struct dma_fence *fence;
 772         int ret;
 773
 774         spin_lock(&man->move_lock);
 775         fence = dma_fence_get(man->move);
 776         spin_unlock(&man->move_lock);
 777
 778         if (!fence)
 779                 return 0;
 780
 781         if (no_wait_gpu) {
 782                 dma_fence_put(fence);
 783                 return -EBUSY;
 784         }
 785
 786         dma_resv_add_shared_fence(bo->base.resv, fence);
 787
 788         ret = dma_resv_reserve_shared(bo->base.resv, 1);
 789         if (unlikely(ret)) {
 790                 dma_fence_put(fence);
 791                 return ret;
 792         }
 793
 794         dma_fence_put(bo->moving);
 795         bo->moving = fence;
 796         return 0;
 797 }
 798
 799 /*
 800  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 801  * space, or we've evicted everything and there isn't enough space.
 802  */
 803 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 804                                   const struct ttm_place *place,
 805                                   struct ttm_resource *mem,
 806                                   struct ttm_operation_ctx *ctx)
 807 {
 808         struct ttm_bo_device *bdev = bo->bdev;
 809         struct ttm_resource_manager *man = ttm_manager_type(bdev, mem->mem_type);
 810         struct ww_acquire_ctx *ticket;
 811         int ret;
 812
 813         ticket = dma_resv_locking_ctx(bo->base.resv);
 814         do {
 815                 ret = ttm_resource_alloc(bo, place, mem);
 816                 if (likely(!ret))
 817                         break;
 818                 if (unlikely(ret != -ENOSPC))
 819                         return ret;
 820                 ret = ttm_mem_evict_first(bdev, man, place, ctx,
 821                                           ticket);
 822                 if (unlikely(ret != 0))
 823                         return ret;
 824         } while (1);
 825
 826         return ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
 827 }
 828
 829 /**
 830  * ttm_bo_mem_placement - check if placement is compatible
 831  * @bo: BO to find memory for
 832  * @place: where to search
 833  * @mem: the memory object to fill in
 834  *
 835  * Check if placement is compatible and fill in mem structure.
 836  * Returns -EBUSY if placement won't work or negative error code.
 837  * 0 when placement can be used.
 838  */
 839 static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
 840                                 const struct ttm_place *place,
 841                                 struct ttm_resource *mem)
 842 {
 843         struct ttm_bo_device *bdev = bo->bdev;
 844         struct ttm_resource_manager *man;
 845
 846         man = ttm_manager_type(bdev, place->mem_type);
 847         if (!man || !ttm_resource_manager_used(man))
 848                 return -EBUSY;
 849
 850         mem->mem_type = place->mem_type;
 851         mem->placement = place->flags;
 852
 853         spin_lock(&ttm_bo_glob.lru_lock);
 854         ttm_bo_move_to_lru_tail(bo, mem, NULL);
 855         spin_unlock(&ttm_bo_glob.lru_lock);
 856
 857         return 0;
 858 }
 859
 860 /*
 861  * Creates space for memory region @mem according to its type.
 862  *
 863  * This function first searches for free space in compatible memory types in
 864  * the priority order defined by the driver.  If free space isn't found, then
 865  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 866  * space.
 867  */
 868 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 869                         struct ttm_placement *placement,
 870                         struct ttm_resource *mem,
 871                         struct ttm_operation_ctx *ctx)
 872 {
 873         struct ttm_bo_device *bdev = bo->bdev;
 874         bool type_found = false;
 875         int i, ret;
 876
 877         ret = dma_resv_reserve_shared(bo->base.resv, 1);
 878         if (unlikely(ret))
 879                 return ret;
 880
 881         for (i = 0; i < placement->num_placement; ++i) {
 882                 const struct ttm_place *place = &placement->placement[i];
 883                 struct ttm_resource_manager *man;
 884
 885                 ret = ttm_bo_mem_placement(bo, place, mem);
 886                 if (ret)
 887                         continue;
 888
 889                 type_found = true;
 890                 ret = ttm_resource_alloc(bo, place, mem);
 891                 if (ret == -ENOSPC)
 892                         continue;
 893                 if (unlikely(ret))
 894                         goto error;
 895
 896                 man = ttm_manager_type(bdev, mem->mem_type);
 897                 ret = ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
 898                 if (unlikely(ret)) {
 899                         ttm_resource_free(bo, mem);
 900                         if (ret == -EBUSY)
 901                                 continue;
 902
 903                         goto error;
 904                 }
 905                 return 0;
 906         }
 907
 908         for (i = 0; i < placement->num_busy_placement; ++i) {
 909                 const struct ttm_place *place = &placement->busy_placement[i];
 910
 911                 ret = ttm_bo_mem_placement(bo, place, mem);
 912                 if (ret)
 913                         continue;
 914
 915                 type_found = true;
 916                 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
 917                 if (likely(!ret))
 918                         return 0;
 919
 920                 if (ret && ret != -EBUSY)
 921                         goto error;
 922         }
 923
 924         ret = -ENOMEM;
 925         if (!type_found) {
 926                 pr_err(TTM_PFX "No compatible memory type found\n");
 927                 ret = -EINVAL;
 928         }
 929
 930 error:
 931         if (bo->mem.mem_type == TTM_PL_SYSTEM && !bo->pin_count)
 932                 ttm_bo_move_to_lru_tail_unlocked(bo);
 933
 934         return ret;
 935 }
 936 EXPORT_SYMBOL(ttm_bo_mem_space);
 937
 938 static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
 939                                      struct ttm_resource *mem,
 940                                      struct ttm_operation_ctx *ctx,
 941                                      struct ttm_place *hop)
 942 {
 943         struct ttm_placement hop_placement;
 944         int ret;
 945         struct ttm_resource hop_mem = *mem;
 946
 947         hop_mem.mm_node = NULL;
 948         hop_mem.mem_type = TTM_PL_SYSTEM;
 949         hop_mem.placement = 0;
 950
 951         hop_placement.num_placement = hop_placement.num_busy_placement = 1;
 952         hop_placement.placement = hop_placement.busy_placement = hop;
 953
 954         /* find space in the bounce domain */
 955         ret = ttm_bo_mem_space(bo, &hop_placement, &hop_mem, ctx);
 956         if (ret)
 957                 return ret;
 958         /* move to the bounce domain */
 959         ret = ttm_bo_handle_move_mem(bo, &hop_mem, false, ctx, NULL);
 960         if (ret)
 961                 return ret;
 962         return 0;
 963 }
 964
 965 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 966                               struct ttm_placement *placement,
 967                               struct ttm_operation_ctx *ctx)
 968 {
 969         int ret = 0;
 970         struct ttm_place hop;
 971         struct ttm_resource mem;
 972
 973         dma_resv_assert_held(bo->base.resv);
 974
 975         memset(&hop, 0, sizeof(hop));
 976
 977         mem.num_pages = PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT;
 978         mem.page_alignment = bo->mem.page_alignment;
 979         mem.bus.offset = 0;
 980         mem.bus.addr = NULL;
 981         mem.mm_node = NULL;
 982
 983         /*
 984          * Determine where to move the buffer.
 985          *
 986          * If driver determines move is going to need
 987          * an extra step then it will return -EMULTIHOP
 988          * and the buffer will be moved to the temporary
 989          * stop and the driver will be called to make
 990          * the second hop.
 991          */
 992 bounce:
 993         ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
 994         if (ret)
 995                 return ret;
 996         ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx, &hop);
 997         if (ret == -EMULTIHOP) {
 998                 ret = ttm_bo_bounce_temp_buffer(bo, &mem, ctx, &hop);
 999                 if (ret)
1000                         return ret;
1001                 /* try and move to final place now. */
1002                 goto bounce;
1003         }
1004         if (ret)
1005                 ttm_resource_free(bo, &mem);
1006         return ret;
1007 }
1008
1009 static bool ttm_bo_places_compat(const struct ttm_place *places,
1010                                  unsigned num_placement,
1011                                  struct ttm_resource *mem,
1012                                  uint32_t *new_flags)
1013 {
1014         unsigned i;
1015
1016         for (i = 0; i < num_placement; i++) {
1017                 const struct ttm_place *heap = &places[i];
1018
1019                 if ((mem->start < heap->fpfn ||
1020                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1021                         continue;
1022
1023                 *new_flags = heap->flags;
1024                 if ((mem->mem_type == heap->mem_type) &&
1025                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1026                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1027                         return true;
1028         }
1029         return false;
1030 }
1031
1032 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1033                        struct ttm_resource *mem,
1034                        uint32_t *new_flags)
1035 {
1036         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1037                                  mem, new_flags))
1038                 return true;
1039
1040         if ((placement->busy_placement != placement->placement ||
1041              placement->num_busy_placement > placement->num_placement) &&
1042             ttm_bo_places_compat(placement->busy_placement,
1043                                  placement->num_busy_placement,
1044                                  mem, new_flags))
1045                 return true;
1046
1047         return false;
1048 }
1049 EXPORT_SYMBOL(ttm_bo_mem_compat);
1050
1051 int ttm_bo_validate(struct ttm_buffer_object *bo,
1052                     struct ttm_placement *placement,
1053                     struct ttm_operation_ctx *ctx)
1054 {
1055         int ret;
1056         uint32_t new_flags;
1057
1058         dma_resv_assert_held(bo->base.resv);
1059
1060         /*
1061          * Remove the backing store if no placement is given.
1062          */
1063         if (!placement->num_placement && !placement->num_busy_placement) {
1064                 ret = ttm_bo_pipeline_gutting(bo);
1065                 if (ret)
1066                         return ret;
1067
1068                 return ttm_tt_create(bo, false);
1069         }
1070
1071         /*
1072          * Check whether we need to move buffer.
1073          */
1074         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1075                 ret = ttm_bo_move_buffer(bo, placement, ctx);
1076                 if (ret)
1077                         return ret;
1078         }
1079         /*
1080          * We might need to add a TTM.
1081          */
1082         if (bo->mem.mem_type == TTM_PL_SYSTEM) {
1083                 ret = ttm_tt_create(bo, true);
1084                 if (ret)
1085                         return ret;
1086         }
1087         return 0;
1088 }
1089 EXPORT_SYMBOL(ttm_bo_validate);
1090
1091 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1092                          struct ttm_buffer_object *bo,
1093                          size_t size,
1094                          enum ttm_bo_type type,
1095                          struct ttm_placement *placement,
1096                          uint32_t page_alignment,
1097                          struct ttm_operation_ctx *ctx,
1098                          size_t acc_size,
1099                          struct sg_table *sg,
1100                          struct dma_resv *resv,
1101                          void (*destroy) (struct ttm_buffer_object *))
1102 {
1103         struct ttm_mem_global *mem_glob = &ttm_mem_glob;
1104         bool locked;
1105         int ret = 0;
1106
1107         ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1108         if (ret) {
1109                 pr_err("Out of kernel memory\n");
1110                 if (destroy)
1111                         (*destroy)(bo);
1112                 else
1113                         kfree(bo);
1114                 return -ENOMEM;
1115         }
1116
1117         bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1118
1119         kref_init(&bo->kref);
1120         INIT_LIST_HEAD(&bo->lru);
1121         INIT_LIST_HEAD(&bo->ddestroy);
1122         INIT_LIST_HEAD(&bo->swap);
1123         bo->bdev = bdev;
1124         bo->type = type;
1125         bo->mem.mem_type = TTM_PL_SYSTEM;
1126         bo->mem.num_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
1127         bo->mem.mm_node = NULL;
1128         bo->mem.page_alignment = page_alignment;
1129         bo->mem.bus.offset = 0;
1130         bo->mem.bus.addr = NULL;
1131         bo->moving = NULL;
1132         bo->mem.placement = 0;
1133         bo->acc_size = acc_size;
1134         bo->pin_count = 0;
1135         bo->sg = sg;
1136         if (resv) {
1137                 bo->base.resv = resv;
1138                 dma_resv_assert_held(bo->base.resv);
1139         } else {
1140                 bo->base.resv = &bo->base._resv;
1141         }
1142         if (!ttm_bo_uses_embedded_gem_object(bo)) {
1143                 /*
1144                  * bo.base is not initialized, so we have to setup the
1145                  * struct elements we want use regardless.
1146                  */
1147                 bo->base.size = size;
1148                 dma_resv_init(&bo->base._resv);
1149                 drm_vma_node_reset(&bo->base.vma_node);
1150         }
1151         atomic_inc(&ttm_bo_glob.bo_count);
1152
1153         /*
1154          * For ttm_bo_type_device buffers, allocate
1155          * address space from the device.
1156          */
1157         if (bo->type == ttm_bo_type_device ||
1158             bo->type == ttm_bo_type_sg)
1159                 ret = drm_vma_offset_add(bdev->vma_manager, &bo->base.vma_node,
1160                                          bo->mem.num_pages);
1161
1162         /* passed reservation objects should already be locked,
1163          * since otherwise lockdep will be angered in radeon.
1164          */
1165         if (!resv) {
1166                 locked = dma_resv_trylock(bo->base.resv);
1167                 WARN_ON(!locked);
1168         }
1169
1170         if (likely(!ret))
1171                 ret = ttm_bo_validate(bo, placement, ctx);
1172
1173         if (unlikely(ret)) {
1174                 if (!resv)
1175                         ttm_bo_unreserve(bo);
1176
1177                 ttm_bo_put(bo);
1178                 return ret;
1179         }
1180
1181         ttm_bo_move_to_lru_tail_unlocked(bo);
1182
1183         return ret;
1184 }
1185 EXPORT_SYMBOL(ttm_bo_init_reserved);
1186
1187 int ttm_bo_init(struct ttm_bo_device *bdev,
1188                 struct ttm_buffer_object *bo,
1189                 size_t size,
1190                 enum ttm_bo_type type,
1191                 struct ttm_placement *placement,
1192                 uint32_t page_alignment,
1193                 bool interruptible,
1194                 size_t acc_size,
1195                 struct sg_table *sg,
1196                 struct dma_resv *resv,
1197                 void (*destroy) (struct ttm_buffer_object *))
1198 {
1199         struct ttm_operation_ctx ctx = { interruptible, false };
1200         int ret;
1201
1202         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1203                                    page_alignment, &ctx, acc_size,
1204                                    sg, resv, destroy);
1205         if (ret)
1206                 return ret;
1207
1208         if (!resv)
1209                 ttm_bo_unreserve(bo);
1210
1211         return 0;
1212 }
1213 EXPORT_SYMBOL(ttm_bo_init);
1214
1215 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1216                            unsigned long bo_size,
1217                            unsigned struct_size)
1218 {
1219         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1220         size_t size = 0;
1221
1222         size += ttm_round_pot(struct_size);
1223         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1224         size += ttm_round_pot(sizeof(struct ttm_tt));
1225         return size;
1226 }
1227 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1228
1229 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1230 {
1231         struct ttm_bo_global *glob =
1232                 container_of(kobj, struct ttm_bo_global, kobj);
1233
1234         __free_page(glob->dummy_read_page);
1235 }
1236
1237 static void ttm_bo_global_release(void)
1238 {
1239         struct ttm_bo_global *glob = &ttm_bo_glob;
1240
1241         mutex_lock(&ttm_global_mutex);
1242         if (--ttm_bo_glob_use_count > 0)
1243                 goto out;
1244
1245         kobject_del(&glob->kobj);
1246         kobject_put(&glob->kobj);
1247         ttm_mem_global_release(&ttm_mem_glob);
1248         memset(glob, 0, sizeof(*glob));
1249 out:
1250         mutex_unlock(&ttm_global_mutex);
1251 }
1252
1253 static int ttm_bo_global_init(void)
1254 {
1255         struct ttm_bo_global *glob = &ttm_bo_glob;
1256         int ret = 0;
1257         unsigned i;
1258
1259         mutex_lock(&ttm_global_mutex);
1260         if (++ttm_bo_glob_use_count > 1)
1261                 goto out;
1262
1263         ret = ttm_mem_global_init(&ttm_mem_glob);
1264         if (ret)
1265                 goto out;
1266
1267         spin_lock_init(&glob->lru_lock);
1268         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1269
1270         if (unlikely(glob->dummy_read_page == NULL)) {
1271                 ret = -ENOMEM;
1272                 goto out;
1273         }
1274
1275         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1276                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1277         INIT_LIST_HEAD(&glob->device_list);
1278         atomic_set(&glob->bo_count, 0);
1279
1280         ret = kobject_init_and_add(
1281                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1282         if (unlikely(ret != 0))
1283                 kobject_put(&glob->kobj);
1284 out:
1285         mutex_unlock(&ttm_global_mutex);
1286         return ret;
1287 }
1288
1289 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1290 {
1291         struct ttm_bo_global *glob = &ttm_bo_glob;
1292         int ret = 0;
1293         unsigned i;
1294         struct ttm_resource_manager *man;
1295
1296         man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
1297         ttm_resource_manager_set_used(man, false);
1298         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
1299
1300         mutex_lock(&ttm_global_mutex);
1301         list_del(&bdev->device_list);
1302         mutex_unlock(&ttm_global_mutex);
1303
1304         cancel_delayed_work_sync(&bdev->wq);
1305
1306         if (ttm_bo_delayed_delete(bdev, true))
1307                 pr_debug("Delayed destroy list was clean\n");
1308
1309         spin_lock(&glob->lru_lock);
1310         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1311                 if (list_empty(&man->lru[0]))
1312                         pr_debug("Swap list %d was clean\n", i);
1313         spin_unlock(&glob->lru_lock);
1314
1315         ttm_pool_fini(&bdev->pool);
1316
1317         if (!ret)
1318                 ttm_bo_global_release();
1319
1320         return ret;
1321 }
1322 EXPORT_SYMBOL(ttm_bo_device_release);
1323
1324 static void ttm_bo_init_sysman(struct ttm_bo_device *bdev)
1325 {
1326         struct ttm_resource_manager *man = &bdev->sysman;
1327
1328         /*
1329          * Initialize the system memory buffer type.
1330          * Other types need to be driver / IOCTL initialized.
1331          */
1332         man->use_tt = true;
1333
1334         ttm_resource_manager_init(man, 0);
1335         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, man);
1336         ttm_resource_manager_set_used(man, true);
1337 }
1338
1339 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1340                        struct ttm_bo_driver *driver,
1341                        struct device *dev,
1342                        struct address_space *mapping,
1343                        struct drm_vma_offset_manager *vma_manager,
1344                        bool use_dma_alloc, bool use_dma32)
1345 {
1346         struct ttm_bo_global *glob = &ttm_bo_glob;
1347         int ret;
1348
1349         if (WARN_ON(vma_manager == NULL))
1350                 return -EINVAL;
1351
1352         ret = ttm_bo_global_init();
1353         if (ret)
1354                 return ret;
1355
1356         bdev->driver = driver;
1357
1358         ttm_bo_init_sysman(bdev);
1359         ttm_pool_init(&bdev->pool, dev, use_dma_alloc, use_dma32);
1360
1361         bdev->vma_manager = vma_manager;
1362         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1363         INIT_LIST_HEAD(&bdev->ddestroy);
1364         bdev->dev_mapping = mapping;
1365         mutex_lock(&ttm_global_mutex);
1366         list_add_tail(&bdev->device_list, &glob->device_list);
1367         mutex_unlock(&ttm_global_mutex);
1368
1369         return 0;
1370 }
1371 EXPORT_SYMBOL(ttm_bo_device_init);
1372
1373 /*
1374  * buffer object vm functions.
1375  */
1376
1377 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1378 {
1379         struct ttm_bo_device *bdev = bo->bdev;
1380
1381         drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1382         ttm_mem_io_free(bdev, &bo->mem);
1383 }
1384 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1385
1386 int ttm_bo_wait(struct ttm_buffer_object *bo,
1387                 bool interruptible, bool no_wait)
1388 {
1389         long timeout = 15 * HZ;
1390
1391         if (no_wait) {
1392                 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1393                         return 0;
1394                 else
1395                         return -EBUSY;
1396         }
1397
1398         timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1399                                                       interruptible, timeout);
1400         if (timeout < 0)
1401                 return timeout;
1402
1403         if (timeout == 0)
1404                 return -EBUSY;
1405
1406         dma_resv_add_excl_fence(bo->base.resv, NULL);
1407         return 0;
1408 }
1409 EXPORT_SYMBOL(ttm_bo_wait);
1410
1411 /*
1412  * A buffer object shrink method that tries to swap out the first
1413  * buffer object on the bo_global::swap_lru list.
1414  */
1415 int ttm_bo_swapout(struct ttm_operation_ctx *ctx)
1416 {
1417         struct ttm_bo_global *glob = &ttm_bo_glob;
1418         struct ttm_buffer_object *bo;
1419         int ret = -EBUSY;
1420         bool locked;
1421         unsigned i;
1422
1423         spin_lock(&glob->lru_lock);
1424         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1425                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1426                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1427                                                             NULL))
1428                                 continue;
1429
1430                         if (!ttm_bo_get_unless_zero(bo)) {
1431                                 if (locked)
1432                                         dma_resv_unlock(bo->base.resv);
1433                                 continue;
1434                         }
1435
1436                         ret = 0;
1437                         break;
1438                 }
1439                 if (!ret)
1440                         break;
1441         }
1442
1443         if (ret) {
1444                 spin_unlock(&glob->lru_lock);
1445                 return ret;
1446         }
1447
1448         if (bo->deleted) {
1449                 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1450                 ttm_bo_put(bo);
1451                 return ret;
1452         }
1453
1454         ttm_bo_del_from_lru(bo);
1455         spin_unlock(&glob->lru_lock);
1456
1457         /**
1458          * Move to system cached
1459          */
1460
1461         if (bo->mem.mem_type != TTM_PL_SYSTEM) {
1462                 struct ttm_operation_ctx ctx = { false, false };
1463                 struct ttm_resource evict_mem;
1464                 struct ttm_place hop;
1465
1466                 memset(&hop, 0, sizeof(hop));
1467
1468                 evict_mem = bo->mem;
1469                 evict_mem.mm_node = NULL;
1470                 evict_mem.placement = 0;
1471                 evict_mem.mem_type = TTM_PL_SYSTEM;
1472
1473                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx, &hop);
1474                 if (unlikely(ret != 0)) {
1475                         WARN(ret == -EMULTIHOP, "Unexpected multihop in swaput - likely driver bug.\n");
1476                         goto out;
1477                 }
1478         }
1479
1480         /**
1481          * Make sure BO is idle.
1482          */
1483
1484         ret = ttm_bo_wait(bo, false, false);
1485         if (unlikely(ret != 0))
1486                 goto out;
1487
1488         ttm_bo_unmap_virtual(bo);
1489
1490         /**
1491          * Swap out. Buffer will be swapped in again as soon as
1492          * anyone tries to access a ttm page.
1493          */
1494
1495         if (bo->bdev->driver->swap_notify)
1496                 bo->bdev->driver->swap_notify(bo);
1497
1498         ret = ttm_tt_swapout(bo->bdev, bo->ttm);
1499 out:
1500
1501         /**
1502          *
1503          * Unreserve without putting on LRU to avoid swapping out an
1504          * already swapped buffer.
1505          */
1506         if (locked)
1507                 dma_resv_unlock(bo->base.resv);
1508         ttm_bo_put(bo);
1509         return ret;
1510 }
1511 EXPORT_SYMBOL(ttm_bo_swapout);
1512
1513 void ttm_bo_tt_destroy(struct ttm_buffer_object *bo)
1514 {
1515         if (bo->ttm == NULL)
1516                 return;
1517
1518         ttm_tt_destroy(bo->bdev, bo->ttm);
1519         bo->ttm = NULL;
1520 }
1521