drivers/gpu/drm/ttm/ttm_bo.c

   1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2 /**************************************************************************
   3  *
   4  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  25  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28 /*
  29  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  30  */
  31
  32 #define pr_fmt(fmt) "[TTM] " fmt
  33
  34 #include <drm/ttm/ttm_module.h>
  35 #include <drm/ttm/ttm_bo_driver.h>
  36 #include <drm/ttm/ttm_placement.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/slab.h>
  39 #include <linux/sched.h>
  40 #include <linux/mm.h>
  41 #include <linux/file.h>
  42 #include <linux/module.h>
  43 #include <linux/atomic.h>
  44 #include <linux/dma-resv.h>
  45
  46 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  47
  48 /**
  49  * ttm_global_mutex - protecting the global BO state
  50  */
  51 DEFINE_MUTEX(ttm_global_mutex);
  52 unsigned ttm_bo_glob_use_count;
  53 struct ttm_bo_global ttm_bo_glob;
  54 EXPORT_SYMBOL(ttm_bo_glob);
  55
  56 static struct attribute ttm_bo_count = {
  57         .name = "bo_count",
  58         .mode = S_IRUGO
  59 };
  60
  61 /* default destructor */
  62 static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
  63 {
  64         kfree(bo);
  65 }
  66
  67 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  68                                         struct ttm_placement *placement)
  69 {
  70         struct drm_printer p = drm_debug_printer(TTM_PFX);
  71         struct ttm_resource_manager *man;
  72         int i, mem_type;
  73
  74         drm_printf(&p, "No space for %p (%lu pages, %luK, %luM)\n",
  75                    bo, bo->mem.num_pages, bo->mem.size >> 10,
  76                    bo->mem.size >> 20);
  77         for (i = 0; i < placement->num_placement; i++) {
  78                 mem_type = placement->placement[i].mem_type;
  79                 drm_printf(&p, "  placement[%d]=0x%08X (%d)\n",
  80                            i, placement->placement[i].flags, mem_type);
  81                 man = ttm_manager_type(bo->bdev, mem_type);
  82                 ttm_resource_manager_debug(man, &p);
  83         }
  84 }
  85
  86 static ssize_t ttm_bo_global_show(struct kobject *kobj,
  87                                   struct attribute *attr,
  88                                   char *buffer)
  89 {
  90         struct ttm_bo_global *glob =
  91                 container_of(kobj, struct ttm_bo_global, kobj);
  92
  93         return snprintf(buffer, PAGE_SIZE, "%d\n",
  94                                 atomic_read(&glob->bo_count));
  95 }
  96
  97 static struct attribute *ttm_bo_global_attrs[] = {
  98         &ttm_bo_count,
  99         NULL
 100 };
 101
 102 static const struct sysfs_ops ttm_bo_global_ops = {
 103         .show = &ttm_bo_global_show
 104 };
 105
 106 static struct kobj_type ttm_bo_glob_kobj_type  = {
 107         .release = &ttm_bo_global_kobj_release,
 108         .sysfs_ops = &ttm_bo_global_ops,
 109         .default_attrs = ttm_bo_global_attrs
 110 };
 111
 112 static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
 113                                   struct ttm_resource *mem)
 114 {
 115         struct ttm_bo_device *bdev = bo->bdev;
 116         struct ttm_resource_manager *man;
 117
 118         if (!list_empty(&bo->lru))
 119                 return;
 120
 121         if (mem->placement & TTM_PL_FLAG_NO_EVICT)
 122                 return;
 123
 124         man = ttm_manager_type(bdev, mem->mem_type);
 125         list_add_tail(&bo->lru, &man->lru[bo->priority]);
 126
 127         if (man->use_tt && bo->ttm &&
 128             !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
 129                                      TTM_PAGE_FLAG_SWAPPED))) {
 130                 list_add_tail(&bo->swap, &ttm_bo_glob.swap_lru[bo->priority]);
 131         }
 132 }
 133
 134 static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 135 {
 136         struct ttm_bo_device *bdev = bo->bdev;
 137         bool notify = false;
 138
 139         if (!list_empty(&bo->swap)) {
 140                 list_del_init(&bo->swap);
 141                 notify = true;
 142         }
 143         if (!list_empty(&bo->lru)) {
 144                 list_del_init(&bo->lru);
 145                 notify = true;
 146         }
 147
 148         if (notify && bdev->driver->del_from_lru_notify)
 149                 bdev->driver->del_from_lru_notify(bo);
 150 }
 151
 152 static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
 153                                      struct ttm_buffer_object *bo)
 154 {
 155         if (!pos->first)
 156                 pos->first = bo;
 157         pos->last = bo;
 158 }
 159
 160 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 161                              struct ttm_lru_bulk_move *bulk)
 162 {
 163         dma_resv_assert_held(bo->base.resv);
 164
 165         ttm_bo_del_from_lru(bo);
 166         ttm_bo_add_mem_to_lru(bo, &bo->mem);
 167
 168         if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 169                 switch (bo->mem.mem_type) {
 170                 case TTM_PL_TT:
 171                         ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
 172                         break;
 173
 174                 case TTM_PL_VRAM:
 175                         ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
 176                         break;
 177                 }
 178                 if (bo->ttm && !(bo->ttm->page_flags &
 179                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
 180                         ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
 181         }
 182 }
 183 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 184
 185 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
 186 {
 187         unsigned i;
 188
 189         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 190                 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
 191                 struct ttm_resource_manager *man;
 192
 193                 if (!pos->first)
 194                         continue;
 195
 196                 dma_resv_assert_held(pos->first->base.resv);
 197                 dma_resv_assert_held(pos->last->base.resv);
 198
 199                 man = ttm_manager_type(pos->first->bdev, TTM_PL_TT);
 200                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 201                                     &pos->last->lru);
 202         }
 203
 204         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 205                 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
 206                 struct ttm_resource_manager *man;
 207
 208                 if (!pos->first)
 209                         continue;
 210
 211                 dma_resv_assert_held(pos->first->base.resv);
 212                 dma_resv_assert_held(pos->last->base.resv);
 213
 214                 man = ttm_manager_type(pos->first->bdev, TTM_PL_VRAM);
 215                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 216                                     &pos->last->lru);
 217         }
 218
 219         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 220                 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
 221                 struct list_head *lru;
 222
 223                 if (!pos->first)
 224                         continue;
 225
 226                 dma_resv_assert_held(pos->first->base.resv);
 227                 dma_resv_assert_held(pos->last->base.resv);
 228
 229                 lru = &ttm_bo_glob.swap_lru[i];
 230                 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
 231         }
 232 }
 233 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
 234
 235 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 236                                   struct ttm_resource *mem, bool evict,
 237                                   struct ttm_operation_ctx *ctx)
 238 {
 239         struct ttm_bo_device *bdev = bo->bdev;
 240         struct ttm_resource_manager *old_man = ttm_manager_type(bdev, bo->mem.mem_type);
 241         struct ttm_resource_manager *new_man = ttm_manager_type(bdev, mem->mem_type);
 242         int ret;
 243
 244         ttm_bo_unmap_virtual(bo);
 245
 246         /*
 247          * Create and bind a ttm if required.
 248          */
 249
 250         if (new_man->use_tt) {
 251                 /* Zero init the new TTM structure if the old location should
 252                  * have used one as well.
 253                  */
 254                 ret = ttm_tt_create(bo, old_man->use_tt);
 255                 if (ret)
 256                         goto out_err;
 257
 258                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 259                 if (ret)
 260                         goto out_err;
 261
 262                 if (mem->mem_type != TTM_PL_SYSTEM) {
 263                         ret = ttm_tt_populate(bdev, bo->ttm, ctx);
 264                         if (ret)
 265                                 goto out_err;
 266
 267                         ret = ttm_bo_tt_bind(bo, mem);
 268                         if (ret)
 269                                 goto out_err;
 270                 }
 271
 272                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 273                         if (bdev->driver->move_notify)
 274                                 bdev->driver->move_notify(bo, evict, mem);
 275                         bo->mem = *mem;
 276                         goto moved;
 277                 }
 278         }
 279
 280         if (bdev->driver->move_notify)
 281                 bdev->driver->move_notify(bo, evict, mem);
 282
 283         if (old_man->use_tt && new_man->use_tt)
 284                 ret = ttm_bo_move_ttm(bo, ctx, mem);
 285         else if (bdev->driver->move)
 286                 ret = bdev->driver->move(bo, evict, ctx, mem);
 287         else
 288                 ret = ttm_bo_move_memcpy(bo, ctx, mem);
 289
 290         if (ret) {
 291                 if (bdev->driver->move_notify) {
 292                         swap(*mem, bo->mem);
 293                         bdev->driver->move_notify(bo, false, mem);
 294                         swap(*mem, bo->mem);
 295                 }
 296
 297                 goto out_err;
 298         }
 299
 300 moved:
 301         ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
 302         return 0;
 303
 304 out_err:
 305         new_man = ttm_manager_type(bdev, bo->mem.mem_type);
 306         if (!new_man->use_tt)
 307                 ttm_bo_tt_destroy(bo);
 308
 309         return ret;
 310 }
 311
 312 /**
 313  * Call bo::reserved.
 314  * Will release GPU memory type usage on destruction.
 315  * This is the place to put in driver specific hooks to release
 316  * driver private resources.
 317  * Will release the bo::reserved lock.
 318  */
 319
 320 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 321 {
 322         if (bo->bdev->driver->move_notify)
 323                 bo->bdev->driver->move_notify(bo, false, NULL);
 324
 325         ttm_bo_tt_destroy(bo);
 326         ttm_resource_free(bo, &bo->mem);
 327 }
 328
 329 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 330 {
 331         int r;
 332
 333         if (bo->base.resv == &bo->base._resv)
 334                 return 0;
 335
 336         BUG_ON(!dma_resv_trylock(&bo->base._resv));
 337
 338         r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
 339         dma_resv_unlock(&bo->base._resv);
 340         if (r)
 341                 return r;
 342
 343         if (bo->type != ttm_bo_type_sg) {
 344                 /* This works because the BO is about to be destroyed and nobody
 345                  * reference it any more. The only tricky case is the trylock on
 346                  * the resv object while holding the lru_lock.
 347                  */
 348                 spin_lock(&ttm_bo_glob.lru_lock);
 349                 bo->base.resv = &bo->base._resv;
 350                 spin_unlock(&ttm_bo_glob.lru_lock);
 351         }
 352
 353         return r;
 354 }
 355
 356 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 357 {
 358         struct dma_resv *resv = &bo->base._resv;
 359         struct dma_resv_list *fobj;
 360         struct dma_fence *fence;
 361         int i;
 362
 363         rcu_read_lock();
 364         fobj = rcu_dereference(resv->fence);
 365         fence = rcu_dereference(resv->fence_excl);
 366         if (fence && !fence->ops->signaled)
 367                 dma_fence_enable_sw_signaling(fence);
 368
 369         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 370                 fence = rcu_dereference(fobj->shared[i]);
 371
 372                 if (!fence->ops->signaled)
 373                         dma_fence_enable_sw_signaling(fence);
 374         }
 375         rcu_read_unlock();
 376 }
 377
 378 /**
 379  * function ttm_bo_cleanup_refs
 380  * If bo idle, remove from lru lists, and unref.
 381  * If not idle, block if possible.
 382  *
 383  * Must be called with lru_lock and reservation held, this function
 384  * will drop the lru lock and optionally the reservation lock before returning.
 385  *
 386  * @interruptible         Any sleeps should occur interruptibly.
 387  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 388  * @unlock_resv           Unlock the reservation lock as well.
 389  */
 390
 391 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 392                                bool interruptible, bool no_wait_gpu,
 393                                bool unlock_resv)
 394 {
 395         struct dma_resv *resv = &bo->base._resv;
 396         int ret;
 397
 398         if (dma_resv_test_signaled_rcu(resv, true))
 399                 ret = 0;
 400         else
 401                 ret = -EBUSY;
 402
 403         if (ret && !no_wait_gpu) {
 404                 long lret;
 405
 406                 if (unlock_resv)
 407                         dma_resv_unlock(bo->base.resv);
 408                 spin_unlock(&ttm_bo_glob.lru_lock);
 409
 410                 lret = dma_resv_wait_timeout_rcu(resv, true, interruptible,
 411                                                  30 * HZ);
 412
 413                 if (lret < 0)
 414                         return lret;
 415                 else if (lret == 0)
 416                         return -EBUSY;
 417
 418                 spin_lock(&ttm_bo_glob.lru_lock);
 419                 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
 420                         /*
 421                          * We raced, and lost, someone else holds the reservation now,
 422                          * and is probably busy in ttm_bo_cleanup_memtype_use.
 423                          *
 424                          * Even if it's not the case, because we finished waiting any
 425                          * delayed destruction would succeed, so just return success
 426                          * here.
 427                          */
 428                         spin_unlock(&ttm_bo_glob.lru_lock);
 429                         return 0;
 430                 }
 431                 ret = 0;
 432         }
 433
 434         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 435                 if (unlock_resv)
 436                         dma_resv_unlock(bo->base.resv);
 437                 spin_unlock(&ttm_bo_glob.lru_lock);
 438                 return ret;
 439         }
 440
 441         ttm_bo_del_from_lru(bo);
 442         list_del_init(&bo->ddestroy);
 443         spin_unlock(&ttm_bo_glob.lru_lock);
 444         ttm_bo_cleanup_memtype_use(bo);
 445
 446         if (unlock_resv)
 447                 dma_resv_unlock(bo->base.resv);
 448
 449         ttm_bo_put(bo);
 450
 451         return 0;
 452 }
 453
 454 /**
 455  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 456  * encountered buffers.
 457  */
 458 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 459 {
 460         struct ttm_bo_global *glob = &ttm_bo_glob;
 461         struct list_head removed;
 462         bool empty;
 463
 464         INIT_LIST_HEAD(&removed);
 465
 466         spin_lock(&glob->lru_lock);
 467         while (!list_empty(&bdev->ddestroy)) {
 468                 struct ttm_buffer_object *bo;
 469
 470                 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
 471                                       ddestroy);
 472                 list_move_tail(&bo->ddestroy, &removed);
 473                 if (!ttm_bo_get_unless_zero(bo))
 474                         continue;
 475
 476                 if (remove_all || bo->base.resv != &bo->base._resv) {
 477                         spin_unlock(&glob->lru_lock);
 478                         dma_resv_lock(bo->base.resv, NULL);
 479
 480                         spin_lock(&glob->lru_lock);
 481                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 482
 483                 } else if (dma_resv_trylock(bo->base.resv)) {
 484                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 485                 } else {
 486                         spin_unlock(&glob->lru_lock);
 487                 }
 488
 489                 ttm_bo_put(bo);
 490                 spin_lock(&glob->lru_lock);
 491         }
 492         list_splice_tail(&removed, &bdev->ddestroy);
 493         empty = list_empty(&bdev->ddestroy);
 494         spin_unlock(&glob->lru_lock);
 495
 496         return empty;
 497 }
 498
 499 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 500 {
 501         struct ttm_bo_device *bdev =
 502             container_of(work, struct ttm_bo_device, wq.work);
 503
 504         if (!ttm_bo_delayed_delete(bdev, false))
 505                 schedule_delayed_work(&bdev->wq,
 506                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 507 }
 508
 509 static void ttm_bo_release(struct kref *kref)
 510 {
 511         struct ttm_buffer_object *bo =
 512             container_of(kref, struct ttm_buffer_object, kref);
 513         struct ttm_bo_device *bdev = bo->bdev;
 514         size_t acc_size = bo->acc_size;
 515         int ret;
 516
 517         if (!bo->deleted) {
 518                 ret = ttm_bo_individualize_resv(bo);
 519                 if (ret) {
 520                         /* Last resort, if we fail to allocate memory for the
 521                          * fences block for the BO to become idle
 522                          */
 523                         dma_resv_wait_timeout_rcu(bo->base.resv, true, false,
 524                                                   30 * HZ);
 525                 }
 526
 527                 if (bo->bdev->driver->release_notify)
 528                         bo->bdev->driver->release_notify(bo);
 529
 530                 drm_vma_offset_remove(bdev->vma_manager, &bo->base.vma_node);
 531                 ttm_mem_io_free(bdev, &bo->mem);
 532         }
 533
 534         if (!dma_resv_test_signaled_rcu(bo->base.resv, true) ||
 535             !dma_resv_trylock(bo->base.resv)) {
 536                 /* The BO is not idle, resurrect it for delayed destroy */
 537                 ttm_bo_flush_all_fences(bo);
 538                 bo->deleted = true;
 539
 540                 spin_lock(&ttm_bo_glob.lru_lock);
 541
 542                 /*
 543                  * Make NO_EVICT bos immediately available to
 544                  * shrinkers, now that they are queued for
 545                  * destruction.
 546                  */
 547                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 548                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 549                         ttm_bo_del_from_lru(bo);
 550                         ttm_bo_add_mem_to_lru(bo, &bo->mem);
 551                 }
 552
 553                 kref_init(&bo->kref);
 554                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 555                 spin_unlock(&ttm_bo_glob.lru_lock);
 556
 557                 schedule_delayed_work(&bdev->wq,
 558                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 559                 return;
 560         }
 561
 562         spin_lock(&ttm_bo_glob.lru_lock);
 563         ttm_bo_del_from_lru(bo);
 564         list_del(&bo->ddestroy);
 565         spin_unlock(&ttm_bo_glob.lru_lock);
 566
 567         ttm_bo_cleanup_memtype_use(bo);
 568         dma_resv_unlock(bo->base.resv);
 569
 570         atomic_dec(&ttm_bo_glob.bo_count);
 571         dma_fence_put(bo->moving);
 572         if (!ttm_bo_uses_embedded_gem_object(bo))
 573                 dma_resv_fini(&bo->base._resv);
 574         bo->destroy(bo);
 575         ttm_mem_global_free(&ttm_mem_glob, acc_size);
 576 }
 577
 578 void ttm_bo_put(struct ttm_buffer_object *bo)
 579 {
 580         kref_put(&bo->kref, ttm_bo_release);
 581 }
 582 EXPORT_SYMBOL(ttm_bo_put);
 583
 584 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 585 {
 586         return cancel_delayed_work_sync(&bdev->wq);
 587 }
 588 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 589
 590 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 591 {
 592         if (resched)
 593                 schedule_delayed_work(&bdev->wq,
 594                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 595 }
 596 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 597
 598 static int ttm_bo_evict(struct ttm_buffer_object *bo,
 599                         struct ttm_operation_ctx *ctx)
 600 {
 601         struct ttm_bo_device *bdev = bo->bdev;
 602         struct ttm_resource evict_mem;
 603         struct ttm_placement placement;
 604         int ret = 0;
 605
 606         dma_resv_assert_held(bo->base.resv);
 607
 608         placement.num_placement = 0;
 609         placement.num_busy_placement = 0;
 610         bdev->driver->evict_flags(bo, &placement);
 611
 612         if (!placement.num_placement && !placement.num_busy_placement) {
 613                 ttm_bo_wait(bo, false, false);
 614
 615                 ttm_bo_cleanup_memtype_use(bo);
 616                 return ttm_tt_create(bo, false);
 617         }
 618
 619         evict_mem = bo->mem;
 620         evict_mem.mm_node = NULL;
 621         evict_mem.bus.offset = 0;
 622         evict_mem.bus.addr = NULL;
 623
 624         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 625         if (ret) {
 626                 if (ret != -ERESTARTSYS) {
 627                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 628                                bo);
 629                         ttm_bo_mem_space_debug(bo, &placement);
 630                 }
 631                 goto out;
 632         }
 633
 634         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
 635         if (unlikely(ret)) {
 636                 if (ret != -ERESTARTSYS)
 637                         pr_err("Buffer eviction failed\n");
 638                 ttm_resource_free(bo, &evict_mem);
 639         }
 640 out:
 641         return ret;
 642 }
 643
 644 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 645                               const struct ttm_place *place)
 646 {
 647         /* Don't evict this BO if it's outside of the
 648          * requested placement range
 649          */
 650         if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 651             (place->lpfn && place->lpfn <= bo->mem.start))
 652                 return false;
 653
 654         return true;
 655 }
 656 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 657
 658 /**
 659  * Check the target bo is allowable to be evicted or swapout, including cases:
 660  *
 661  * a. if share same reservation object with ctx->resv, have assumption
 662  * reservation objects should already be locked, so not lock again and
 663  * return true directly when either the opreation allow_reserved_eviction
 664  * or the target bo already is in delayed free list;
 665  *
 666  * b. Otherwise, trylock it.
 667  */
 668 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 669                         struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
 670 {
 671         bool ret = false;
 672
 673         if (bo->base.resv == ctx->resv) {
 674                 dma_resv_assert_held(bo->base.resv);
 675                 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT)
 676                         ret = true;
 677                 *locked = false;
 678                 if (busy)
 679                         *busy = false;
 680         } else {
 681                 ret = dma_resv_trylock(bo->base.resv);
 682                 *locked = ret;
 683                 if (busy)
 684                         *busy = !ret;
 685         }
 686
 687         return ret;
 688 }
 689
 690 /**
 691  * ttm_mem_evict_wait_busy - wait for a busy BO to become available
 692  *
 693  * @busy_bo: BO which couldn't be locked with trylock
 694  * @ctx: operation context
 695  * @ticket: acquire ticket
 696  *
 697  * Try to lock a busy buffer object to avoid failing eviction.
 698  */
 699 static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
 700                                    struct ttm_operation_ctx *ctx,
 701                                    struct ww_acquire_ctx *ticket)
 702 {
 703         int r;
 704
 705         if (!busy_bo || !ticket)
 706                 return -EBUSY;
 707
 708         if (ctx->interruptible)
 709                 r = dma_resv_lock_interruptible(busy_bo->base.resv,
 710                                                           ticket);
 711         else
 712                 r = dma_resv_lock(busy_bo->base.resv, ticket);
 713
 714         /*
 715          * TODO: It would be better to keep the BO locked until allocation is at
 716          * least tried one more time, but that would mean a much larger rework
 717          * of TTM.
 718          */
 719         if (!r)
 720                 dma_resv_unlock(busy_bo->base.resv);
 721
 722         return r == -EDEADLK ? -EBUSY : r;
 723 }
 724
 725 int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 726                         struct ttm_resource_manager *man,
 727                         const struct ttm_place *place,
 728                         struct ttm_operation_ctx *ctx,
 729                         struct ww_acquire_ctx *ticket)
 730 {
 731         struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
 732         bool locked = false;
 733         unsigned i;
 734         int ret;
 735
 736         spin_lock(&ttm_bo_glob.lru_lock);
 737         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 738                 list_for_each_entry(bo, &man->lru[i], lru) {
 739                         bool busy;
 740
 741                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
 742                                                             &busy)) {
 743                                 if (busy && !busy_bo && ticket !=
 744                                     dma_resv_locking_ctx(bo->base.resv))
 745                                         busy_bo = bo;
 746                                 continue;
 747                         }
 748
 749                         if (place && !bdev->driver->eviction_valuable(bo,
 750                                                                       place)) {
 751                                 if (locked)
 752                                         dma_resv_unlock(bo->base.resv);
 753                                 continue;
 754                         }
 755                         if (!ttm_bo_get_unless_zero(bo)) {
 756                                 if (locked)
 757                                         dma_resv_unlock(bo->base.resv);
 758                                 continue;
 759                         }
 760                         break;
 761                 }
 762
 763                 /* If the inner loop terminated early, we have our candidate */
 764                 if (&bo->lru != &man->lru[i])
 765                         break;
 766
 767                 bo = NULL;
 768         }
 769
 770         if (!bo) {
 771                 if (busy_bo && !ttm_bo_get_unless_zero(busy_bo))
 772                         busy_bo = NULL;
 773                 spin_unlock(&ttm_bo_glob.lru_lock);
 774                 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
 775                 if (busy_bo)
 776                         ttm_bo_put(busy_bo);
 777                 return ret;
 778         }
 779
 780         if (bo->deleted) {
 781                 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
 782                                           ctx->no_wait_gpu, locked);
 783                 ttm_bo_put(bo);
 784                 return ret;
 785         }
 786
 787         spin_unlock(&ttm_bo_glob.lru_lock);
 788
 789         ret = ttm_bo_evict(bo, ctx);
 790         if (locked)
 791                 ttm_bo_unreserve(bo);
 792
 793         ttm_bo_put(bo);
 794         return ret;
 795 }
 796
 797 /**
 798  * Add the last move fence to the BO and reserve a new shared slot.
 799  */
 800 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 801                                  struct ttm_resource_manager *man,
 802                                  struct ttm_resource *mem,
 803                                  bool no_wait_gpu)
 804 {
 805         struct dma_fence *fence;
 806         int ret;
 807
 808         spin_lock(&man->move_lock);
 809         fence = dma_fence_get(man->move);
 810         spin_unlock(&man->move_lock);
 811
 812         if (!fence)
 813                 return 0;
 814
 815         if (no_wait_gpu) {
 816                 dma_fence_put(fence);
 817                 return -EBUSY;
 818         }
 819
 820         dma_resv_add_shared_fence(bo->base.resv, fence);
 821
 822         ret = dma_resv_reserve_shared(bo->base.resv, 1);
 823         if (unlikely(ret)) {
 824                 dma_fence_put(fence);
 825                 return ret;
 826         }
 827
 828         dma_fence_put(bo->moving);
 829         bo->moving = fence;
 830         return 0;
 831 }
 832
 833 /**
 834  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 835  * space, or we've evicted everything and there isn't enough space.
 836  */
 837 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 838                                   const struct ttm_place *place,
 839                                   struct ttm_resource *mem,
 840                                   struct ttm_operation_ctx *ctx)
 841 {
 842         struct ttm_bo_device *bdev = bo->bdev;
 843         struct ttm_resource_manager *man = ttm_manager_type(bdev, mem->mem_type);
 844         struct ww_acquire_ctx *ticket;
 845         int ret;
 846
 847         ticket = dma_resv_locking_ctx(bo->base.resv);
 848         do {
 849                 ret = ttm_resource_alloc(bo, place, mem);
 850                 if (likely(!ret))
 851                         break;
 852                 if (unlikely(ret != -ENOSPC))
 853                         return ret;
 854                 ret = ttm_mem_evict_first(bdev, man, place, ctx,
 855                                           ticket);
 856                 if (unlikely(ret != 0))
 857                         return ret;
 858         } while (1);
 859
 860         return ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
 861 }
 862
 863 static uint32_t ttm_bo_select_caching(struct ttm_resource_manager *man,
 864                                       uint32_t cur_placement,
 865                                       uint32_t proposed_placement)
 866 {
 867         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 868         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 869
 870         /**
 871          * Keep current caching if possible.
 872          */
 873
 874         if ((cur_placement & caching) != 0)
 875                 result |= (cur_placement & caching);
 876         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 877                 result |= TTM_PL_FLAG_CACHED;
 878         else if ((TTM_PL_FLAG_WC & caching) != 0)
 879                 result |= TTM_PL_FLAG_WC;
 880         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 881                 result |= TTM_PL_FLAG_UNCACHED;
 882
 883         return result;
 884 }
 885
 886 /**
 887  * ttm_bo_mem_placement - check if placement is compatible
 888  * @bo: BO to find memory for
 889  * @place: where to search
 890  * @mem: the memory object to fill in
 891  * @ctx: operation context
 892  *
 893  * Check if placement is compatible and fill in mem structure.
 894  * Returns -EBUSY if placement won't work or negative error code.
 895  * 0 when placement can be used.
 896  */
 897 static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
 898                                 const struct ttm_place *place,
 899                                 struct ttm_resource *mem,
 900                                 struct ttm_operation_ctx *ctx)
 901 {
 902         struct ttm_bo_device *bdev = bo->bdev;
 903         struct ttm_resource_manager *man;
 904         uint32_t cur_flags = 0;
 905
 906         man = ttm_manager_type(bdev, place->mem_type);
 907         if (!man || !ttm_resource_manager_used(man))
 908                 return -EBUSY;
 909
 910         cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 911                                           place->flags);
 912         cur_flags |= place->flags & ~TTM_PL_MASK_CACHING;
 913
 914         mem->mem_type = place->mem_type;
 915         mem->placement = cur_flags;
 916
 917         spin_lock(&ttm_bo_glob.lru_lock);
 918         ttm_bo_del_from_lru(bo);
 919         ttm_bo_add_mem_to_lru(bo, mem);
 920         spin_unlock(&ttm_bo_glob.lru_lock);
 921
 922         return 0;
 923 }
 924
 925 /**
 926  * Creates space for memory region @mem according to its type.
 927  *
 928  * This function first searches for free space in compatible memory types in
 929  * the priority order defined by the driver.  If free space isn't found, then
 930  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 931  * space.
 932  */
 933 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 934                         struct ttm_placement *placement,
 935                         struct ttm_resource *mem,
 936                         struct ttm_operation_ctx *ctx)
 937 {
 938         struct ttm_bo_device *bdev = bo->bdev;
 939         bool type_found = false;
 940         int i, ret;
 941
 942         ret = dma_resv_reserve_shared(bo->base.resv, 1);
 943         if (unlikely(ret))
 944                 return ret;
 945
 946         for (i = 0; i < placement->num_placement; ++i) {
 947                 const struct ttm_place *place = &placement->placement[i];
 948                 struct ttm_resource_manager *man;
 949
 950                 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
 951                 if (ret)
 952                         continue;
 953
 954                 type_found = true;
 955                 ret = ttm_resource_alloc(bo, place, mem);
 956                 if (ret == -ENOSPC)
 957                         continue;
 958                 if (unlikely(ret))
 959                         goto error;
 960
 961                 man = ttm_manager_type(bdev, mem->mem_type);
 962                 ret = ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
 963                 if (unlikely(ret)) {
 964                         ttm_resource_free(bo, mem);
 965                         if (ret == -EBUSY)
 966                                 continue;
 967
 968                         goto error;
 969                 }
 970                 return 0;
 971         }
 972
 973         for (i = 0; i < placement->num_busy_placement; ++i) {
 974                 const struct ttm_place *place = &placement->busy_placement[i];
 975
 976                 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
 977                 if (ret)
 978                         continue;
 979
 980                 type_found = true;
 981                 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
 982                 if (likely(!ret))
 983                         return 0;
 984
 985                 if (ret && ret != -EBUSY)
 986                         goto error;
 987         }
 988
 989         ret = -ENOMEM;
 990         if (!type_found) {
 991                 pr_err(TTM_PFX "No compatible memory type found\n");
 992                 ret = -EINVAL;
 993         }
 994
 995 error:
 996         if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
 997                 ttm_bo_move_to_lru_tail_unlocked(bo);
 998         }
 999
1000         return ret;
1001 }
1002 EXPORT_SYMBOL(ttm_bo_mem_space);
1003
1004 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1005                               struct ttm_placement *placement,
1006                               struct ttm_operation_ctx *ctx)
1007 {
1008         int ret = 0;
1009         struct ttm_resource mem;
1010
1011         dma_resv_assert_held(bo->base.resv);
1012
1013         mem.num_pages = bo->num_pages;
1014         mem.size = mem.num_pages << PAGE_SHIFT;
1015         mem.page_alignment = bo->mem.page_alignment;
1016         mem.bus.offset = 0;
1017         mem.bus.addr = NULL;
1018         mem.mm_node = NULL;
1019
1020         /*
1021          * Determine where to move the buffer.
1022          */
1023         ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1024         if (ret)
1025                 goto out_unlock;
1026         ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1027 out_unlock:
1028         if (ret)
1029                 ttm_resource_free(bo, &mem);
1030         return ret;
1031 }
1032
1033 static bool ttm_bo_places_compat(const struct ttm_place *places,
1034                                  unsigned num_placement,
1035                                  struct ttm_resource *mem,
1036                                  uint32_t *new_flags)
1037 {
1038         unsigned i;
1039
1040         for (i = 0; i < num_placement; i++) {
1041                 const struct ttm_place *heap = &places[i];
1042
1043                 if ((mem->start < heap->fpfn ||
1044                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1045                         continue;
1046
1047                 *new_flags = heap->flags;
1048                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1049                     (mem->mem_type == heap->mem_type) &&
1050                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1051                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1052                         return true;
1053         }
1054         return false;
1055 }
1056
1057 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1058                        struct ttm_resource *mem,
1059                        uint32_t *new_flags)
1060 {
1061         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1062                                  mem, new_flags))
1063                 return true;
1064
1065         if ((placement->busy_placement != placement->placement ||
1066              placement->num_busy_placement > placement->num_placement) &&
1067             ttm_bo_places_compat(placement->busy_placement,
1068                                  placement->num_busy_placement,
1069                                  mem, new_flags))
1070                 return true;
1071
1072         return false;
1073 }
1074 EXPORT_SYMBOL(ttm_bo_mem_compat);
1075
1076 int ttm_bo_validate(struct ttm_buffer_object *bo,
1077                     struct ttm_placement *placement,
1078                     struct ttm_operation_ctx *ctx)
1079 {
1080         int ret;
1081         uint32_t new_flags;
1082
1083         dma_resv_assert_held(bo->base.resv);
1084
1085         /*
1086          * Remove the backing store if no placement is given.
1087          */
1088         if (!placement->num_placement && !placement->num_busy_placement) {
1089                 ret = ttm_bo_pipeline_gutting(bo);
1090                 if (ret)
1091                         return ret;
1092
1093                 return ttm_tt_create(bo, false);
1094         }
1095
1096         /*
1097          * Check whether we need to move buffer.
1098          */
1099         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1100                 ret = ttm_bo_move_buffer(bo, placement, ctx);
1101                 if (ret)
1102                         return ret;
1103         } else {
1104                 bo->mem.placement &= TTM_PL_MASK_CACHING;
1105                 bo->mem.placement |= new_flags & ~TTM_PL_MASK_CACHING;
1106         }
1107         /*
1108          * We might need to add a TTM.
1109          */
1110         if (bo->mem.mem_type == TTM_PL_SYSTEM) {
1111                 ret = ttm_tt_create(bo, true);
1112                 if (ret)
1113                         return ret;
1114         }
1115         return 0;
1116 }
1117 EXPORT_SYMBOL(ttm_bo_validate);
1118
1119 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1120                          struct ttm_buffer_object *bo,
1121                          unsigned long size,
1122                          enum ttm_bo_type type,
1123                          struct ttm_placement *placement,
1124                          uint32_t page_alignment,
1125                          struct ttm_operation_ctx *ctx,
1126                          size_t acc_size,
1127                          struct sg_table *sg,
1128                          struct dma_resv *resv,
1129                          void (*destroy) (struct ttm_buffer_object *))
1130 {
1131         struct ttm_mem_global *mem_glob = &ttm_mem_glob;
1132         int ret = 0;
1133         unsigned long num_pages;
1134         bool locked;
1135
1136         ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1137         if (ret) {
1138                 pr_err("Out of kernel memory\n");
1139                 if (destroy)
1140                         (*destroy)(bo);
1141                 else
1142                         kfree(bo);
1143                 return -ENOMEM;
1144         }
1145
1146         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1147         if (num_pages == 0) {
1148                 pr_err("Illegal buffer object size\n");
1149                 if (destroy)
1150                         (*destroy)(bo);
1151                 else
1152                         kfree(bo);
1153                 ttm_mem_global_free(mem_glob, acc_size);
1154                 return -EINVAL;
1155         }
1156         bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1157
1158         kref_init(&bo->kref);
1159         INIT_LIST_HEAD(&bo->lru);
1160         INIT_LIST_HEAD(&bo->ddestroy);
1161         INIT_LIST_HEAD(&bo->swap);
1162         bo->bdev = bdev;
1163         bo->type = type;
1164         bo->num_pages = num_pages;
1165         bo->mem.size = num_pages << PAGE_SHIFT;
1166         bo->mem.mem_type = TTM_PL_SYSTEM;
1167         bo->mem.num_pages = bo->num_pages;
1168         bo->mem.mm_node = NULL;
1169         bo->mem.page_alignment = page_alignment;
1170         bo->mem.bus.offset = 0;
1171         bo->mem.bus.addr = NULL;
1172         bo->moving = NULL;
1173         bo->mem.placement = TTM_PL_FLAG_CACHED;
1174         bo->acc_size = acc_size;
1175         bo->sg = sg;
1176         if (resv) {
1177                 bo->base.resv = resv;
1178                 dma_resv_assert_held(bo->base.resv);
1179         } else {
1180                 bo->base.resv = &bo->base._resv;
1181         }
1182         if (!ttm_bo_uses_embedded_gem_object(bo)) {
1183                 /*
1184                  * bo.gem is not initialized, so we have to setup the
1185                  * struct elements we want use regardless.
1186                  */
1187                 dma_resv_init(&bo->base._resv);
1188                 drm_vma_node_reset(&bo->base.vma_node);
1189         }
1190         atomic_inc(&ttm_bo_glob.bo_count);
1191
1192         /*
1193          * For ttm_bo_type_device buffers, allocate
1194          * address space from the device.
1195          */
1196         if (bo->type == ttm_bo_type_device ||
1197             bo->type == ttm_bo_type_sg)
1198                 ret = drm_vma_offset_add(bdev->vma_manager, &bo->base.vma_node,
1199                                          bo->mem.num_pages);
1200
1201         /* passed reservation objects should already be locked,
1202          * since otherwise lockdep will be angered in radeon.
1203          */
1204         if (!resv) {
1205                 locked = dma_resv_trylock(bo->base.resv);
1206                 WARN_ON(!locked);
1207         }
1208
1209         if (likely(!ret))
1210                 ret = ttm_bo_validate(bo, placement, ctx);
1211
1212         if (unlikely(ret)) {
1213                 if (!resv)
1214                         ttm_bo_unreserve(bo);
1215
1216                 ttm_bo_put(bo);
1217                 return ret;
1218         }
1219
1220         ttm_bo_move_to_lru_tail_unlocked(bo);
1221
1222         return ret;
1223 }
1224 EXPORT_SYMBOL(ttm_bo_init_reserved);
1225
1226 int ttm_bo_init(struct ttm_bo_device *bdev,
1227                 struct ttm_buffer_object *bo,
1228                 unsigned long size,
1229                 enum ttm_bo_type type,
1230                 struct ttm_placement *placement,
1231                 uint32_t page_alignment,
1232                 bool interruptible,
1233                 size_t acc_size,
1234                 struct sg_table *sg,
1235                 struct dma_resv *resv,
1236                 void (*destroy) (struct ttm_buffer_object *))
1237 {
1238         struct ttm_operation_ctx ctx = { interruptible, false };
1239         int ret;
1240
1241         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1242                                    page_alignment, &ctx, acc_size,
1243                                    sg, resv, destroy);
1244         if (ret)
1245                 return ret;
1246
1247         if (!resv)
1248                 ttm_bo_unreserve(bo);
1249
1250         return 0;
1251 }
1252 EXPORT_SYMBOL(ttm_bo_init);
1253
1254 static size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1255                               unsigned long bo_size,
1256                               unsigned struct_size)
1257 {
1258         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1259         size_t size = 0;
1260
1261         size += ttm_round_pot(struct_size);
1262         size += ttm_round_pot(npages * sizeof(void *));
1263         size += ttm_round_pot(sizeof(struct ttm_tt));
1264         return size;
1265 }
1266
1267 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1268                            unsigned long bo_size,
1269                            unsigned struct_size)
1270 {
1271         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1272         size_t size = 0;
1273
1274         size += ttm_round_pot(struct_size);
1275         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1276         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1277         return size;
1278 }
1279 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1280
1281 int ttm_bo_create(struct ttm_bo_device *bdev,
1282                         unsigned long size,
1283                         enum ttm_bo_type type,
1284                         struct ttm_placement *placement,
1285                         uint32_t page_alignment,
1286                         bool interruptible,
1287                         struct ttm_buffer_object **p_bo)
1288 {
1289         struct ttm_buffer_object *bo;
1290         size_t acc_size;
1291         int ret;
1292
1293         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1294         if (unlikely(bo == NULL))
1295                 return -ENOMEM;
1296
1297         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1298         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1299                           interruptible, acc_size,
1300                           NULL, NULL, NULL);
1301         if (likely(ret == 0))
1302                 *p_bo = bo;
1303
1304         return ret;
1305 }
1306 EXPORT_SYMBOL(ttm_bo_create);
1307
1308 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1309 {
1310         struct ttm_resource_manager *man = ttm_manager_type(bdev, mem_type);
1311
1312         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1313                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1314                 return -EINVAL;
1315         }
1316
1317         if (!man) {
1318                 pr_err("Memory type %u has not been initialized\n", mem_type);
1319                 return 0;
1320         }
1321
1322         return ttm_resource_manager_force_list_clean(bdev, man);
1323 }
1324 EXPORT_SYMBOL(ttm_bo_evict_mm);
1325
1326 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1327 {
1328         struct ttm_bo_global *glob =
1329                 container_of(kobj, struct ttm_bo_global, kobj);
1330
1331         __free_page(glob->dummy_read_page);
1332 }
1333
1334 static void ttm_bo_global_release(void)
1335 {
1336         struct ttm_bo_global *glob = &ttm_bo_glob;
1337
1338         mutex_lock(&ttm_global_mutex);
1339         if (--ttm_bo_glob_use_count > 0)
1340                 goto out;
1341
1342         kobject_del(&glob->kobj);
1343         kobject_put(&glob->kobj);
1344         ttm_mem_global_release(&ttm_mem_glob);
1345         memset(glob, 0, sizeof(*glob));
1346 out:
1347         mutex_unlock(&ttm_global_mutex);
1348 }
1349
1350 static int ttm_bo_global_init(void)
1351 {
1352         struct ttm_bo_global *glob = &ttm_bo_glob;
1353         int ret = 0;
1354         unsigned i;
1355
1356         mutex_lock(&ttm_global_mutex);
1357         if (++ttm_bo_glob_use_count > 1)
1358                 goto out;
1359
1360         ret = ttm_mem_global_init(&ttm_mem_glob);
1361         if (ret)
1362                 goto out;
1363
1364         spin_lock_init(&glob->lru_lock);
1365         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1366
1367         if (unlikely(glob->dummy_read_page == NULL)) {
1368                 ret = -ENOMEM;
1369                 goto out;
1370         }
1371
1372         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1373                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1374         INIT_LIST_HEAD(&glob->device_list);
1375         atomic_set(&glob->bo_count, 0);
1376
1377         ret = kobject_init_and_add(
1378                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1379         if (unlikely(ret != 0))
1380                 kobject_put(&glob->kobj);
1381 out:
1382         mutex_unlock(&ttm_global_mutex);
1383         return ret;
1384 }
1385
1386 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1387 {
1388         struct ttm_bo_global *glob = &ttm_bo_glob;
1389         int ret = 0;
1390         unsigned i;
1391         struct ttm_resource_manager *man;
1392
1393         man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
1394         ttm_resource_manager_set_used(man, false);
1395         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
1396
1397         mutex_lock(&ttm_global_mutex);
1398         list_del(&bdev->device_list);
1399         mutex_unlock(&ttm_global_mutex);
1400
1401         cancel_delayed_work_sync(&bdev->wq);
1402
1403         if (ttm_bo_delayed_delete(bdev, true))
1404                 pr_debug("Delayed destroy list was clean\n");
1405
1406         spin_lock(&glob->lru_lock);
1407         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1408                 if (list_empty(&man->lru[0]))
1409                         pr_debug("Swap list %d was clean\n", i);
1410         spin_unlock(&glob->lru_lock);
1411
1412         if (!ret)
1413                 ttm_bo_global_release();
1414
1415         return ret;
1416 }
1417 EXPORT_SYMBOL(ttm_bo_device_release);
1418
1419 static void ttm_bo_init_sysman(struct ttm_bo_device *bdev)
1420 {
1421         struct ttm_resource_manager *man = &bdev->sysman;
1422
1423         /*
1424          * Initialize the system memory buffer type.
1425          * Other types need to be driver / IOCTL initialized.
1426          */
1427         man->use_tt = true;
1428
1429         ttm_resource_manager_init(man, 0);
1430         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, man);
1431         ttm_resource_manager_set_used(man, true);
1432 }
1433
1434 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1435                        struct ttm_bo_driver *driver,
1436                        struct address_space *mapping,
1437                        struct drm_vma_offset_manager *vma_manager,
1438                        bool need_dma32)
1439 {
1440         struct ttm_bo_global *glob = &ttm_bo_glob;
1441         int ret;
1442
1443         if (WARN_ON(vma_manager == NULL))
1444                 return -EINVAL;
1445
1446         ret = ttm_bo_global_init();
1447         if (ret)
1448                 return ret;
1449
1450         bdev->driver = driver;
1451
1452         ttm_bo_init_sysman(bdev);
1453
1454         bdev->vma_manager = vma_manager;
1455         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1456         INIT_LIST_HEAD(&bdev->ddestroy);
1457         bdev->dev_mapping = mapping;
1458         bdev->need_dma32 = need_dma32;
1459         mutex_lock(&ttm_global_mutex);
1460         list_add_tail(&bdev->device_list, &glob->device_list);
1461         mutex_unlock(&ttm_global_mutex);
1462
1463         return 0;
1464 }
1465 EXPORT_SYMBOL(ttm_bo_device_init);
1466
1467 /*
1468  * buffer object vm functions.
1469  */
1470
1471 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1472 {
1473         struct ttm_bo_device *bdev = bo->bdev;
1474
1475         drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1476         ttm_mem_io_free(bdev, &bo->mem);
1477 }
1478 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1479
1480 int ttm_bo_wait(struct ttm_buffer_object *bo,
1481                 bool interruptible, bool no_wait)
1482 {
1483         long timeout = 15 * HZ;
1484
1485         if (no_wait) {
1486                 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1487                         return 0;
1488                 else
1489                         return -EBUSY;
1490         }
1491
1492         timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1493                                                       interruptible, timeout);
1494         if (timeout < 0)
1495                 return timeout;
1496
1497         if (timeout == 0)
1498                 return -EBUSY;
1499
1500         dma_resv_add_excl_fence(bo->base.resv, NULL);
1501         return 0;
1502 }
1503 EXPORT_SYMBOL(ttm_bo_wait);
1504
1505 /**
1506  * A buffer object shrink method that tries to swap out the first
1507  * buffer object on the bo_global::swap_lru list.
1508  */
1509 int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1510 {
1511         struct ttm_buffer_object *bo;
1512         int ret = -EBUSY;
1513         bool locked;
1514         unsigned i;
1515
1516         spin_lock(&glob->lru_lock);
1517         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1518                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1519                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1520                                                             NULL))
1521                                 continue;
1522
1523                         if (!ttm_bo_get_unless_zero(bo)) {
1524                                 if (locked)
1525                                         dma_resv_unlock(bo->base.resv);
1526                                 continue;
1527                         }
1528
1529                         ret = 0;
1530                         break;
1531                 }
1532                 if (!ret)
1533                         break;
1534         }
1535
1536         if (ret) {
1537                 spin_unlock(&glob->lru_lock);
1538                 return ret;
1539         }
1540
1541         if (bo->deleted) {
1542                 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1543                 ttm_bo_put(bo);
1544                 return ret;
1545         }
1546
1547         ttm_bo_del_from_lru(bo);
1548         spin_unlock(&glob->lru_lock);
1549
1550         /**
1551          * Move to system cached
1552          */
1553
1554         if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1555             bo->ttm->caching_state != tt_cached) {
1556                 struct ttm_operation_ctx ctx = { false, false };
1557                 struct ttm_resource evict_mem;
1558
1559                 evict_mem = bo->mem;
1560                 evict_mem.mm_node = NULL;
1561                 evict_mem.placement = TTM_PL_FLAG_CACHED;
1562                 evict_mem.mem_type = TTM_PL_SYSTEM;
1563
1564                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1565                 if (unlikely(ret != 0))
1566                         goto out;
1567         }
1568
1569         /**
1570          * Make sure BO is idle.
1571          */
1572
1573         ret = ttm_bo_wait(bo, false, false);
1574         if (unlikely(ret != 0))
1575                 goto out;
1576
1577         ttm_bo_unmap_virtual(bo);
1578
1579         /**
1580          * Swap out. Buffer will be swapped in again as soon as
1581          * anyone tries to access a ttm page.
1582          */
1583
1584         if (bo->bdev->driver->swap_notify)
1585                 bo->bdev->driver->swap_notify(bo);
1586
1587         ret = ttm_tt_swapout(bo->bdev, bo->ttm, bo->persistent_swap_storage);
1588 out:
1589
1590         /**
1591          *
1592          * Unreserve without putting on LRU to avoid swapping out an
1593          * already swapped buffer.
1594          */
1595         if (locked)
1596                 dma_resv_unlock(bo->base.resv);
1597         ttm_bo_put(bo);
1598         return ret;
1599 }
1600 EXPORT_SYMBOL(ttm_bo_swapout);
1601
1602 void ttm_bo_swapout_all(void)
1603 {
1604         struct ttm_operation_ctx ctx = {
1605                 .interruptible = false,
1606                 .no_wait_gpu = false
1607         };
1608
1609         while (ttm_bo_swapout(&ttm_bo_glob, &ctx) == 0);
1610 }
1611 EXPORT_SYMBOL(ttm_bo_swapout_all);
1612
1613 void ttm_bo_tt_destroy(struct ttm_buffer_object *bo)
1614 {
1615         if (bo->ttm == NULL)
1616                 return;
1617
1618         ttm_tt_destroy(bo->bdev, bo->ttm);
1619         bo->ttm = NULL;
1620 }
1621
1622 int ttm_bo_tt_bind(struct ttm_buffer_object *bo, struct ttm_resource *mem)
1623 {
1624         return bo->bdev->driver->ttm_tt_bind(bo->bdev, bo->ttm, mem);
1625 }
1626
1627 void ttm_bo_tt_unbind(struct ttm_buffer_object *bo)
1628 {
1629         bo->bdev->driver->ttm_tt_unbind(bo->bdev, bo->ttm);
1630 }