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_add_mem_to_lru(struct ttm_buffer_object *bo,
 114                                   struct ttm_resource *mem)
 115 {
 116         struct ttm_bo_device *bdev = bo->bdev;
 117         struct ttm_resource_manager *man;
 118
 119         if (!list_empty(&bo->lru) || bo->pin_count)
 120                 return;
 121
 122         man = ttm_manager_type(bdev, mem->mem_type);
 123         list_add_tail(&bo->lru, &man->lru[bo->priority]);
 124
 125         if (man->use_tt && bo->ttm &&
 126             !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
 127                                      TTM_PAGE_FLAG_SWAPPED))) {
 128                 list_add_tail(&bo->swap, &ttm_bo_glob.swap_lru[bo->priority]);
 129         }
 130 }
 131
 132 static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 133 {
 134         struct ttm_bo_device *bdev = bo->bdev;
 135         bool notify = false;
 136
 137         if (!list_empty(&bo->swap)) {
 138                 list_del_init(&bo->swap);
 139                 notify = true;
 140         }
 141         if (!list_empty(&bo->lru)) {
 142                 list_del_init(&bo->lru);
 143                 notify = true;
 144         }
 145
 146         if (notify && bdev->driver->del_from_lru_notify)
 147                 bdev->driver->del_from_lru_notify(bo);
 148 }
 149
 150 static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
 151                                      struct ttm_buffer_object *bo)
 152 {
 153         if (!pos->first)
 154                 pos->first = bo;
 155         pos->last = bo;
 156 }
 157
 158 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 159                              struct ttm_lru_bulk_move *bulk)
 160 {
 161         dma_resv_assert_held(bo->base.resv);
 162
 163         ttm_bo_del_from_lru(bo);
 164         ttm_bo_add_mem_to_lru(bo, &bo->mem);
 165
 166         if (bulk && !bo->pin_count) {
 167                 switch (bo->mem.mem_type) {
 168                 case TTM_PL_TT:
 169                         ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
 170                         break;
 171
 172                 case TTM_PL_VRAM:
 173                         ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
 174                         break;
 175                 }
 176                 if (bo->ttm && !(bo->ttm->page_flags &
 177                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
 178                         ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
 179         }
 180 }
 181 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 182
 183 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
 184 {
 185         unsigned i;
 186
 187         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 188                 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
 189                 struct ttm_resource_manager *man;
 190
 191                 if (!pos->first)
 192                         continue;
 193
 194                 dma_resv_assert_held(pos->first->base.resv);
 195                 dma_resv_assert_held(pos->last->base.resv);
 196
 197                 man = ttm_manager_type(pos->first->bdev, TTM_PL_TT);
 198                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 199                                     &pos->last->lru);
 200         }
 201
 202         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 203                 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
 204                 struct ttm_resource_manager *man;
 205
 206                 if (!pos->first)
 207                         continue;
 208
 209                 dma_resv_assert_held(pos->first->base.resv);
 210                 dma_resv_assert_held(pos->last->base.resv);
 211
 212                 man = ttm_manager_type(pos->first->bdev, TTM_PL_VRAM);
 213                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 214                                     &pos->last->lru);
 215         }
 216
 217         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 218                 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
 219                 struct list_head *lru;
 220
 221                 if (!pos->first)
 222                         continue;
 223
 224                 dma_resv_assert_held(pos->first->base.resv);
 225                 dma_resv_assert_held(pos->last->base.resv);
 226
 227                 lru = &ttm_bo_glob.swap_lru[i];
 228                 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
 229         }
 230 }
 231 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
 232
 233 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 234                                   struct ttm_resource *mem, bool evict,
 235                                   struct ttm_operation_ctx *ctx,
 236                                   struct ttm_place *hop)
 237 {
 238         struct ttm_bo_device *bdev = bo->bdev;
 239         struct ttm_resource_manager *old_man = ttm_manager_type(bdev, bo->mem.mem_type);
 240         struct ttm_resource_manager *new_man = ttm_manager_type(bdev, mem->mem_type);
 241         int ret;
 242
 243         ttm_bo_unmap_virtual(bo);
 244
 245         /*
 246          * Create and bind a ttm if required.
 247          */
 248
 249         if (new_man->use_tt) {
 250                 /* Zero init the new TTM structure if the old location should
 251                  * have used one as well.
 252                  */
 253                 ret = ttm_tt_create(bo, old_man->use_tt);
 254                 if (ret)
 255                         goto out_err;
 256
 257                 if (mem->mem_type != TTM_PL_SYSTEM) {
 258                         ret = ttm_tt_populate(bo->bdev, bo->ttm, ctx);
 259                         if (ret)
 260                                 goto out_err;
 261                 }
 262         }
 263
 264         ret = bdev->driver->move(bo, evict, ctx, mem, hop);
 265         if (ret) {
 266                 if (ret == -EMULTIHOP)
 267                         return ret;
 268                 goto out_err;
 269         }
 270
 271         ctx->bytes_moved += bo->base.size;
 272         return 0;
 273
 274 out_err:
 275         new_man = ttm_manager_type(bdev, bo->mem.mem_type);
 276         if (!new_man->use_tt)
 277                 ttm_bo_tt_destroy(bo);
 278
 279         return ret;
 280 }
 281
 282 /*
 283  * Call bo::reserved.
 284  * Will release GPU memory type usage on destruction.
 285  * This is the place to put in driver specific hooks to release
 286  * driver private resources.
 287  * Will release the bo::reserved lock.
 288  */
 289
 290 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 291 {
 292         if (bo->bdev->driver->delete_mem_notify)
 293                 bo->bdev->driver->delete_mem_notify(bo);
 294
 295         ttm_bo_tt_destroy(bo);
 296         ttm_resource_free(bo, &bo->mem);
 297 }
 298
 299 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 300 {
 301         int r;
 302
 303         if (bo->base.resv == &bo->base._resv)
 304                 return 0;
 305
 306         BUG_ON(!dma_resv_trylock(&bo->base._resv));
 307
 308         r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
 309         dma_resv_unlock(&bo->base._resv);
 310         if (r)
 311                 return r;
 312
 313         if (bo->type != ttm_bo_type_sg) {
 314                 /* This works because the BO is about to be destroyed and nobody
 315                  * reference it any more. The only tricky case is the trylock on
 316                  * the resv object while holding the lru_lock.
 317                  */
 318                 spin_lock(&ttm_bo_glob.lru_lock);
 319                 bo->base.resv = &bo->base._resv;
 320                 spin_unlock(&ttm_bo_glob.lru_lock);
 321         }
 322
 323         return r;
 324 }
 325
 326 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 327 {
 328         struct dma_resv *resv = &bo->base._resv;
 329         struct dma_resv_list *fobj;
 330         struct dma_fence *fence;
 331         int i;
 332
 333         rcu_read_lock();
 334         fobj = rcu_dereference(resv->fence);
 335         fence = rcu_dereference(resv->fence_excl);
 336         if (fence && !fence->ops->signaled)
 337                 dma_fence_enable_sw_signaling(fence);
 338
 339         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 340                 fence = rcu_dereference(fobj->shared[i]);
 341
 342                 if (!fence->ops->signaled)
 343                         dma_fence_enable_sw_signaling(fence);
 344         }
 345         rcu_read_unlock();
 346 }
 347
 348 /**
 349  * function ttm_bo_cleanup_refs
 350  * If bo idle, remove from lru lists, and unref.
 351  * If not idle, block if possible.
 352  *
 353  * Must be called with lru_lock and reservation held, this function
 354  * will drop the lru lock and optionally the reservation lock before returning.
 355  *
 356  * @bo:                    The buffer object to clean-up
 357  * @interruptible:         Any sleeps should occur interruptibly.
 358  * @no_wait_gpu:           Never wait for gpu. Return -EBUSY instead.
 359  * @unlock_resv:           Unlock the reservation lock as well.
 360  */
 361
 362 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 363                                bool interruptible, bool no_wait_gpu,
 364                                bool unlock_resv)
 365 {
 366         struct dma_resv *resv = &bo->base._resv;
 367         int ret;
 368
 369         if (dma_resv_test_signaled_rcu(resv, true))
 370                 ret = 0;
 371         else
 372                 ret = -EBUSY;
 373
 374         if (ret && !no_wait_gpu) {
 375                 long lret;
 376
 377                 if (unlock_resv)
 378                         dma_resv_unlock(bo->base.resv);
 379                 spin_unlock(&ttm_bo_glob.lru_lock);
 380
 381                 lret = dma_resv_wait_timeout_rcu(resv, true, interruptible,
 382                                                  30 * HZ);
 383
 384                 if (lret < 0)
 385                         return lret;
 386                 else if (lret == 0)
 387                         return -EBUSY;
 388
 389                 spin_lock(&ttm_bo_glob.lru_lock);
 390                 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
 391                         /*
 392                          * We raced, and lost, someone else holds the reservation now,
 393                          * and is probably busy in ttm_bo_cleanup_memtype_use.
 394                          *
 395                          * Even if it's not the case, because we finished waiting any
 396                          * delayed destruction would succeed, so just return success
 397                          * here.
 398                          */
 399                         spin_unlock(&ttm_bo_glob.lru_lock);
 400                         return 0;
 401                 }
 402                 ret = 0;
 403         }
 404
 405         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 406                 if (unlock_resv)
 407                         dma_resv_unlock(bo->base.resv);
 408                 spin_unlock(&ttm_bo_glob.lru_lock);
 409                 return ret;
 410         }
 411
 412         ttm_bo_del_from_lru(bo);
 413         list_del_init(&bo->ddestroy);
 414         spin_unlock(&ttm_bo_glob.lru_lock);
 415         ttm_bo_cleanup_memtype_use(bo);
 416
 417         if (unlock_resv)
 418                 dma_resv_unlock(bo->base.resv);
 419
 420         ttm_bo_put(bo);
 421
 422         return 0;
 423 }
 424
 425 /*
 426  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 427  * encountered buffers.
 428  */
 429 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 430 {
 431         struct ttm_bo_global *glob = &ttm_bo_glob;
 432         struct list_head removed;
 433         bool empty;
 434
 435         INIT_LIST_HEAD(&removed);
 436
 437         spin_lock(&glob->lru_lock);
 438         while (!list_empty(&bdev->ddestroy)) {
 439                 struct ttm_buffer_object *bo;
 440
 441                 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
 442                                       ddestroy);
 443                 list_move_tail(&bo->ddestroy, &removed);
 444                 if (!ttm_bo_get_unless_zero(bo))
 445                         continue;
 446
 447                 if (remove_all || bo->base.resv != &bo->base._resv) {
 448                         spin_unlock(&glob->lru_lock);
 449                         dma_resv_lock(bo->base.resv, NULL);
 450
 451                         spin_lock(&glob->lru_lock);
 452                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 453
 454                 } else if (dma_resv_trylock(bo->base.resv)) {
 455                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 456                 } else {
 457                         spin_unlock(&glob->lru_lock);
 458                 }
 459
 460                 ttm_bo_put(bo);
 461                 spin_lock(&glob->lru_lock);
 462         }
 463         list_splice_tail(&removed, &bdev->ddestroy);
 464         empty = list_empty(&bdev->ddestroy);
 465         spin_unlock(&glob->lru_lock);
 466
 467         return empty;
 468 }
 469
 470 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 471 {
 472         struct ttm_bo_device *bdev =
 473             container_of(work, struct ttm_bo_device, wq.work);
 474
 475         if (!ttm_bo_delayed_delete(bdev, false))
 476                 schedule_delayed_work(&bdev->wq,
 477                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 478 }
 479
 480 static void ttm_bo_release(struct kref *kref)
 481 {
 482         struct ttm_buffer_object *bo =
 483             container_of(kref, struct ttm_buffer_object, kref);
 484         struct ttm_bo_device *bdev = bo->bdev;
 485         size_t acc_size = bo->acc_size;
 486         int ret;
 487
 488         if (!bo->deleted) {
 489                 ret = ttm_bo_individualize_resv(bo);
 490                 if (ret) {
 491                         /* Last resort, if we fail to allocate memory for the
 492                          * fences block for the BO to become idle
 493                          */
 494                         dma_resv_wait_timeout_rcu(bo->base.resv, true, false,
 495                                                   30 * HZ);
 496                 }
 497
 498                 if (bo->bdev->driver->release_notify)
 499                         bo->bdev->driver->release_notify(bo);
 500
 501                 drm_vma_offset_remove(bdev->vma_manager, &bo->base.vma_node);
 502                 ttm_mem_io_free(bdev, &bo->mem);
 503         }
 504
 505         if (!dma_resv_test_signaled_rcu(bo->base.resv, true) ||
 506             !dma_resv_trylock(bo->base.resv)) {
 507                 /* The BO is not idle, resurrect it for delayed destroy */
 508                 ttm_bo_flush_all_fences(bo);
 509                 bo->deleted = true;
 510
 511                 spin_lock(&ttm_bo_glob.lru_lock);
 512
 513                 /*
 514                  * Make pinned bos immediately available to
 515                  * shrinkers, now that they are queued for
 516                  * destruction.
 517                  */
 518                 if (WARN_ON(bo->pin_count)) {
 519                         bo->pin_count = 0;
 520                         ttm_bo_del_from_lru(bo);
 521                         ttm_bo_add_mem_to_lru(bo, &bo->mem);
 522                 }
 523
 524                 kref_init(&bo->kref);
 525                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 526                 spin_unlock(&ttm_bo_glob.lru_lock);
 527
 528                 schedule_delayed_work(&bdev->wq,
 529                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 530                 return;
 531         }
 532
 533         spin_lock(&ttm_bo_glob.lru_lock);
 534         ttm_bo_del_from_lru(bo);
 535         list_del(&bo->ddestroy);
 536         spin_unlock(&ttm_bo_glob.lru_lock);
 537
 538         ttm_bo_cleanup_memtype_use(bo);
 539         dma_resv_unlock(bo->base.resv);
 540
 541         atomic_dec(&ttm_bo_glob.bo_count);
 542         dma_fence_put(bo->moving);
 543         if (!ttm_bo_uses_embedded_gem_object(bo))
 544                 dma_resv_fini(&bo->base._resv);
 545         bo->destroy(bo);
 546         ttm_mem_global_free(&ttm_mem_glob, acc_size);
 547 }
 548
 549 void ttm_bo_put(struct ttm_buffer_object *bo)
 550 {
 551         kref_put(&bo->kref, ttm_bo_release);
 552 }
 553 EXPORT_SYMBOL(ttm_bo_put);
 554
 555 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 556 {
 557         return cancel_delayed_work_sync(&bdev->wq);
 558 }
 559 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 560
 561 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 562 {
 563         if (resched)
 564                 schedule_delayed_work(&bdev->wq,
 565                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 566 }
 567 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 568
 569 static int ttm_bo_evict(struct ttm_buffer_object *bo,
 570                         struct ttm_operation_ctx *ctx)
 571 {
 572         struct ttm_bo_device *bdev = bo->bdev;
 573         struct ttm_resource evict_mem;
 574         struct ttm_placement placement;
 575         struct ttm_place hop;
 576         int ret = 0;
 577
 578         memset(&hop, 0, sizeof(hop));
 579
 580         dma_resv_assert_held(bo->base.resv);
 581
 582         placement.num_placement = 0;
 583         placement.num_busy_placement = 0;
 584         bdev->driver->evict_flags(bo, &placement);
 585
 586         if (!placement.num_placement && !placement.num_busy_placement) {
 587                 ttm_bo_wait(bo, false, false);
 588
 589                 ttm_bo_cleanup_memtype_use(bo);
 590                 return ttm_tt_create(bo, false);
 591         }
 592
 593         evict_mem = bo->mem;
 594         evict_mem.mm_node = NULL;
 595         evict_mem.bus.offset = 0;
 596         evict_mem.bus.addr = NULL;
 597
 598         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 599         if (ret) {
 600                 if (ret != -ERESTARTSYS) {
 601                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 602                                bo);
 603                         ttm_bo_mem_space_debug(bo, &placement);
 604                 }
 605                 goto out;
 606         }
 607
 608         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx, &hop);
 609         if (unlikely(ret)) {
 610                 WARN(ret == -EMULTIHOP, "Unexpected multihop in eviction - likely driver bug\n");
 611                 if (ret != -ERESTARTSYS)
 612                         pr_err("Buffer eviction failed\n");
 613                 ttm_resource_free(bo, &evict_mem);
 614         }
 615 out:
 616         return ret;
 617 }
 618
 619 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 620                               const struct ttm_place *place)
 621 {
 622         /* Don't evict this BO if it's outside of the
 623          * requested placement range
 624          */
 625         if (place->fpfn >= (bo->mem.start + bo->mem.num_pages) ||
 626             (place->lpfn && place->lpfn <= bo->mem.start))
 627                 return false;
 628
 629         return true;
 630 }
 631 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 632
 633 /*
 634  * Check the target bo is allowable to be evicted or swapout, including cases:
 635  *
 636  * a. if share same reservation object with ctx->resv, have assumption
 637  * reservation objects should already be locked, so not lock again and
 638  * return true directly when either the opreation allow_reserved_eviction
 639  * or the target bo already is in delayed free list;
 640  *
 641  * b. Otherwise, trylock it.
 642  */
 643 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 644                         struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
 645 {
 646         bool ret = false;
 647
 648         if (bo->base.resv == ctx->resv) {
 649                 dma_resv_assert_held(bo->base.resv);
 650                 if (ctx->allow_res_evict)
 651                         ret = true;
 652                 *locked = false;
 653                 if (busy)
 654                         *busy = false;
 655         } else {
 656                 ret = dma_resv_trylock(bo->base.resv);
 657                 *locked = ret;
 658                 if (busy)
 659                         *busy = !ret;
 660         }
 661
 662         return ret;
 663 }
 664
 665 /**
 666  * ttm_mem_evict_wait_busy - wait for a busy BO to become available
 667  *
 668  * @busy_bo: BO which couldn't be locked with trylock
 669  * @ctx: operation context
 670  * @ticket: acquire ticket
 671  *
 672  * Try to lock a busy buffer object to avoid failing eviction.
 673  */
 674 static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
 675                                    struct ttm_operation_ctx *ctx,
 676                                    struct ww_acquire_ctx *ticket)
 677 {
 678         int r;
 679
 680         if (!busy_bo || !ticket)
 681                 return -EBUSY;
 682
 683         if (ctx->interruptible)
 684                 r = dma_resv_lock_interruptible(busy_bo->base.resv,
 685                                                           ticket);
 686         else
 687                 r = dma_resv_lock(busy_bo->base.resv, ticket);
 688
 689         /*
 690          * TODO: It would be better to keep the BO locked until allocation is at
 691          * least tried one more time, but that would mean a much larger rework
 692          * of TTM.
 693          */
 694         if (!r)
 695                 dma_resv_unlock(busy_bo->base.resv);
 696
 697         return r == -EDEADLK ? -EBUSY : r;
 698 }
 699
 700 int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 701                         struct ttm_resource_manager *man,
 702                         const struct ttm_place *place,
 703                         struct ttm_operation_ctx *ctx,
 704                         struct ww_acquire_ctx *ticket)
 705 {
 706         struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
 707         bool locked = false;
 708         unsigned i;
 709         int ret;
 710
 711         spin_lock(&ttm_bo_glob.lru_lock);
 712         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 713                 list_for_each_entry(bo, &man->lru[i], lru) {
 714                         bool busy;
 715
 716                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
 717                                                             &busy)) {
 718                                 if (busy && !busy_bo && ticket !=
 719                                     dma_resv_locking_ctx(bo->base.resv))
 720                                         busy_bo = bo;
 721                                 continue;
 722                         }
 723
 724                         if (place && !bdev->driver->eviction_valuable(bo,
 725                                                                       place)) {
 726                                 if (locked)
 727                                         dma_resv_unlock(bo->base.resv);
 728                                 continue;
 729                         }
 730                         if (!ttm_bo_get_unless_zero(bo)) {
 731                                 if (locked)
 732                                         dma_resv_unlock(bo->base.resv);
 733                                 continue;
 734                         }
 735                         break;
 736                 }
 737
 738                 /* If the inner loop terminated early, we have our candidate */
 739                 if (&bo->lru != &man->lru[i])
 740                         break;
 741
 742                 bo = NULL;
 743         }
 744
 745         if (!bo) {
 746                 if (busy_bo && !ttm_bo_get_unless_zero(busy_bo))
 747                         busy_bo = NULL;
 748                 spin_unlock(&ttm_bo_glob.lru_lock);
 749                 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
 750                 if (busy_bo)
 751                         ttm_bo_put(busy_bo);
 752                 return ret;
 753         }
 754
 755         if (bo->deleted) {
 756                 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
 757                                           ctx->no_wait_gpu, locked);
 758                 ttm_bo_put(bo);
 759                 return ret;
 760         }
 761
 762         spin_unlock(&ttm_bo_glob.lru_lock);
 763
 764         ret = ttm_bo_evict(bo, ctx);
 765         if (locked)
 766                 ttm_bo_unreserve(bo);
 767
 768         ttm_bo_put(bo);
 769         return ret;
 770 }
 771
 772 /*
 773  * Add the last move fence to the BO and reserve a new shared slot.
 774  */
 775 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 776                                  struct ttm_resource_manager *man,
 777                                  struct ttm_resource *mem,
 778                                  bool no_wait_gpu)
 779 {
 780         struct dma_fence *fence;
 781         int ret;
 782
 783         spin_lock(&man->move_lock);
 784         fence = dma_fence_get(man->move);
 785         spin_unlock(&man->move_lock);
 786
 787         if (!fence)
 788                 return 0;
 789
 790         if (no_wait_gpu) {
 791                 dma_fence_put(fence);
 792                 return -EBUSY;
 793         }
 794
 795         dma_resv_add_shared_fence(bo->base.resv, fence);
 796
 797         ret = dma_resv_reserve_shared(bo->base.resv, 1);
 798         if (unlikely(ret)) {
 799                 dma_fence_put(fence);
 800                 return ret;
 801         }
 802
 803         dma_fence_put(bo->moving);
 804         bo->moving = fence;
 805         return 0;
 806 }
 807
 808 /*
 809  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 810  * space, or we've evicted everything and there isn't enough space.
 811  */
 812 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 813                                   const struct ttm_place *place,
 814                                   struct ttm_resource *mem,
 815                                   struct ttm_operation_ctx *ctx)
 816 {
 817         struct ttm_bo_device *bdev = bo->bdev;
 818         struct ttm_resource_manager *man = ttm_manager_type(bdev, mem->mem_type);
 819         struct ww_acquire_ctx *ticket;
 820         int ret;
 821
 822         ticket = dma_resv_locking_ctx(bo->base.resv);
 823         do {
 824                 ret = ttm_resource_alloc(bo, place, mem);
 825                 if (likely(!ret))
 826                         break;
 827                 if (unlikely(ret != -ENOSPC))
 828                         return ret;
 829                 ret = ttm_mem_evict_first(bdev, man, place, ctx,
 830                                           ticket);
 831                 if (unlikely(ret != 0))
 832                         return ret;
 833         } while (1);
 834
 835         return ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
 836 }
 837
 838 /**
 839  * ttm_bo_mem_placement - check if placement is compatible
 840  * @bo: BO to find memory for
 841  * @place: where to search
 842  * @mem: the memory object to fill in
 843  *
 844  * Check if placement is compatible and fill in mem structure.
 845  * Returns -EBUSY if placement won't work or negative error code.
 846  * 0 when placement can be used.
 847  */
 848 static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
 849                                 const struct ttm_place *place,
 850                                 struct ttm_resource *mem)
 851 {
 852         struct ttm_bo_device *bdev = bo->bdev;
 853         struct ttm_resource_manager *man;
 854
 855         man = ttm_manager_type(bdev, place->mem_type);
 856         if (!man || !ttm_resource_manager_used(man))
 857                 return -EBUSY;
 858
 859         mem->mem_type = place->mem_type;
 860         mem->placement = place->flags;
 861
 862         spin_lock(&ttm_bo_glob.lru_lock);
 863         ttm_bo_del_from_lru(bo);
 864         ttm_bo_add_mem_to_lru(bo, mem);
 865         spin_unlock(&ttm_bo_glob.lru_lock);
 866
 867         return 0;
 868 }
 869
 870 /*
 871  * Creates space for memory region @mem according to its type.
 872  *
 873  * This function first searches for free space in compatible memory types in
 874  * the priority order defined by the driver.  If free space isn't found, then
 875  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 876  * space.
 877  */
 878 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 879                         struct ttm_placement *placement,
 880                         struct ttm_resource *mem,
 881                         struct ttm_operation_ctx *ctx)
 882 {
 883         struct ttm_bo_device *bdev = bo->bdev;
 884         bool type_found = false;
 885         int i, ret;
 886
 887         ret = dma_resv_reserve_shared(bo->base.resv, 1);
 888         if (unlikely(ret))
 889                 return ret;
 890
 891         for (i = 0; i < placement->num_placement; ++i) {
 892                 const struct ttm_place *place = &placement->placement[i];
 893                 struct ttm_resource_manager *man;
 894
 895                 ret = ttm_bo_mem_placement(bo, place, mem);
 896                 if (ret)
 897                         continue;
 898
 899                 type_found = true;
 900                 ret = ttm_resource_alloc(bo, place, mem);
 901                 if (ret == -ENOSPC)
 902                         continue;
 903                 if (unlikely(ret))
 904                         goto error;
 905
 906                 man = ttm_manager_type(bdev, mem->mem_type);
 907                 ret = ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
 908                 if (unlikely(ret)) {
 909                         ttm_resource_free(bo, mem);
 910                         if (ret == -EBUSY)
 911                                 continue;
 912
 913                         goto error;
 914                 }
 915                 return 0;
 916         }
 917
 918         for (i = 0; i < placement->num_busy_placement; ++i) {
 919                 const struct ttm_place *place = &placement->busy_placement[i];
 920
 921                 ret = ttm_bo_mem_placement(bo, place, mem);
 922                 if (ret)
 923                         continue;
 924
 925                 type_found = true;
 926                 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
 927                 if (likely(!ret))
 928                         return 0;
 929
 930                 if (ret && ret != -EBUSY)
 931                         goto error;
 932         }
 933
 934         ret = -ENOMEM;
 935         if (!type_found) {
 936                 pr_err(TTM_PFX "No compatible memory type found\n");
 937                 ret = -EINVAL;
 938         }
 939
 940 error:
 941         if (bo->mem.mem_type == TTM_PL_SYSTEM && !bo->pin_count)
 942                 ttm_bo_move_to_lru_tail_unlocked(bo);
 943
 944         return ret;
 945 }
 946 EXPORT_SYMBOL(ttm_bo_mem_space);
 947
 948 static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
 949                                      struct ttm_resource *mem,
 950                                      struct ttm_operation_ctx *ctx,
 951                                      struct ttm_place *hop)
 952 {
 953         struct ttm_placement hop_placement;
 954         int ret;
 955         struct ttm_resource hop_mem = *mem;
 956
 957         hop_mem.mm_node = NULL;
 958         hop_mem.mem_type = TTM_PL_SYSTEM;
 959         hop_mem.placement = 0;
 960
 961         hop_placement.num_placement = hop_placement.num_busy_placement = 1;
 962         hop_placement.placement = hop_placement.busy_placement = hop;
 963
 964         /* find space in the bounce domain */
 965         ret = ttm_bo_mem_space(bo, &hop_placement, &hop_mem, ctx);
 966         if (ret)
 967                 return ret;
 968         /* move to the bounce domain */
 969         ret = ttm_bo_handle_move_mem(bo, &hop_mem, false, ctx, NULL);
 970         if (ret)
 971                 return ret;
 972         return 0;
 973 }
 974
 975 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 976                               struct ttm_placement *placement,
 977                               struct ttm_operation_ctx *ctx)
 978 {
 979         int ret = 0;
 980         struct ttm_place hop;
 981         struct ttm_resource mem;
 982
 983         dma_resv_assert_held(bo->base.resv);
 984
 985         memset(&hop, 0, sizeof(hop));
 986
 987         mem.num_pages = PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT;
 988         mem.page_alignment = bo->mem.page_alignment;
 989         mem.bus.offset = 0;
 990         mem.bus.addr = NULL;
 991         mem.mm_node = NULL;
 992
 993         /*
 994          * Determine where to move the buffer.
 995          *
 996          * If driver determines move is going to need
 997          * an extra step then it will return -EMULTIHOP
 998          * and the buffer will be moved to the temporary
 999          * stop and the driver will be called to make
1000          * the second hop.
1001          */
1002 bounce:
1003         ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1004         if (ret)
1005                 return ret;
1006         ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx, &hop);
1007         if (ret == -EMULTIHOP) {
1008                 ret = ttm_bo_bounce_temp_buffer(bo, &mem, ctx, &hop);
1009                 if (ret)
1010                         return ret;
1011                 /* try and move to final place now. */
1012                 goto bounce;
1013         }
1014         if (ret)
1015                 ttm_resource_free(bo, &mem);
1016         return ret;
1017 }
1018
1019 static bool ttm_bo_places_compat(const struct ttm_place *places,
1020                                  unsigned num_placement,
1021                                  struct ttm_resource *mem,
1022                                  uint32_t *new_flags)
1023 {
1024         unsigned i;
1025
1026         for (i = 0; i < num_placement; i++) {
1027                 const struct ttm_place *heap = &places[i];
1028
1029                 if ((mem->start < heap->fpfn ||
1030                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1031                         continue;
1032
1033                 *new_flags = heap->flags;
1034                 if ((mem->mem_type == heap->mem_type) &&
1035                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1036                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1037                         return true;
1038         }
1039         return false;
1040 }
1041
1042 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1043                        struct ttm_resource *mem,
1044                        uint32_t *new_flags)
1045 {
1046         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1047                                  mem, new_flags))
1048                 return true;
1049
1050         if ((placement->busy_placement != placement->placement ||
1051              placement->num_busy_placement > placement->num_placement) &&
1052             ttm_bo_places_compat(placement->busy_placement,
1053                                  placement->num_busy_placement,
1054                                  mem, new_flags))
1055                 return true;
1056
1057         return false;
1058 }
1059 EXPORT_SYMBOL(ttm_bo_mem_compat);
1060
1061 int ttm_bo_validate(struct ttm_buffer_object *bo,
1062                     struct ttm_placement *placement,
1063                     struct ttm_operation_ctx *ctx)
1064 {
1065         int ret;
1066         uint32_t new_flags;
1067
1068         dma_resv_assert_held(bo->base.resv);
1069
1070         /*
1071          * Remove the backing store if no placement is given.
1072          */
1073         if (!placement->num_placement && !placement->num_busy_placement) {
1074                 ret = ttm_bo_pipeline_gutting(bo);
1075                 if (ret)
1076                         return ret;
1077
1078                 return ttm_tt_create(bo, false);
1079         }
1080
1081         /*
1082          * Check whether we need to move buffer.
1083          */
1084         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1085                 ret = ttm_bo_move_buffer(bo, placement, ctx);
1086                 if (ret)
1087                         return ret;
1088         }
1089         /*
1090          * We might need to add a TTM.
1091          */
1092         if (bo->mem.mem_type == TTM_PL_SYSTEM) {
1093                 ret = ttm_tt_create(bo, true);
1094                 if (ret)
1095                         return ret;
1096         }
1097         return 0;
1098 }
1099 EXPORT_SYMBOL(ttm_bo_validate);
1100
1101 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1102                          struct ttm_buffer_object *bo,
1103                          size_t size,
1104                          enum ttm_bo_type type,
1105                          struct ttm_placement *placement,
1106                          uint32_t page_alignment,
1107                          struct ttm_operation_ctx *ctx,
1108                          size_t acc_size,
1109                          struct sg_table *sg,
1110                          struct dma_resv *resv,
1111                          void (*destroy) (struct ttm_buffer_object *))
1112 {
1113         struct ttm_mem_global *mem_glob = &ttm_mem_glob;
1114         bool locked;
1115         int ret = 0;
1116
1117         ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1118         if (ret) {
1119                 pr_err("Out of kernel memory\n");
1120                 if (destroy)
1121                         (*destroy)(bo);
1122                 else
1123                         kfree(bo);
1124                 return -ENOMEM;
1125         }
1126
1127         bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1128
1129         kref_init(&bo->kref);
1130         INIT_LIST_HEAD(&bo->lru);
1131         INIT_LIST_HEAD(&bo->ddestroy);
1132         INIT_LIST_HEAD(&bo->swap);
1133         bo->bdev = bdev;
1134         bo->type = type;
1135         bo->mem.mem_type = TTM_PL_SYSTEM;
1136         bo->mem.num_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
1137         bo->mem.mm_node = NULL;
1138         bo->mem.page_alignment = page_alignment;
1139         bo->mem.bus.offset = 0;
1140         bo->mem.bus.addr = NULL;
1141         bo->moving = NULL;
1142         bo->mem.placement = 0;
1143         bo->acc_size = acc_size;
1144         bo->pin_count = 0;
1145         bo->sg = sg;
1146         if (resv) {
1147                 bo->base.resv = resv;
1148                 dma_resv_assert_held(bo->base.resv);
1149         } else {
1150                 bo->base.resv = &bo->base._resv;
1151         }
1152         if (!ttm_bo_uses_embedded_gem_object(bo)) {
1153                 /*
1154                  * bo.base is not initialized, so we have to setup the
1155                  * struct elements we want use regardless.
1156                  */
1157                 bo->base.size = size;
1158                 dma_resv_init(&bo->base._resv);
1159                 drm_vma_node_reset(&bo->base.vma_node);
1160         }
1161         atomic_inc(&ttm_bo_glob.bo_count);
1162
1163         /*
1164          * For ttm_bo_type_device buffers, allocate
1165          * address space from the device.
1166          */
1167         if (bo->type == ttm_bo_type_device ||
1168             bo->type == ttm_bo_type_sg)
1169                 ret = drm_vma_offset_add(bdev->vma_manager, &bo->base.vma_node,
1170                                          bo->mem.num_pages);
1171
1172         /* passed reservation objects should already be locked,
1173          * since otherwise lockdep will be angered in radeon.
1174          */
1175         if (!resv) {
1176                 locked = dma_resv_trylock(bo->base.resv);
1177                 WARN_ON(!locked);
1178         }
1179
1180         if (likely(!ret))
1181                 ret = ttm_bo_validate(bo, placement, ctx);
1182
1183         if (unlikely(ret)) {
1184                 if (!resv)
1185                         ttm_bo_unreserve(bo);
1186
1187                 ttm_bo_put(bo);
1188                 return ret;
1189         }
1190
1191         ttm_bo_move_to_lru_tail_unlocked(bo);
1192
1193         return ret;
1194 }
1195 EXPORT_SYMBOL(ttm_bo_init_reserved);
1196
1197 int ttm_bo_init(struct ttm_bo_device *bdev,
1198                 struct ttm_buffer_object *bo,
1199                 size_t size,
1200                 enum ttm_bo_type type,
1201                 struct ttm_placement *placement,
1202                 uint32_t page_alignment,
1203                 bool interruptible,
1204                 size_t acc_size,
1205                 struct sg_table *sg,
1206                 struct dma_resv *resv,
1207                 void (*destroy) (struct ttm_buffer_object *))
1208 {
1209         struct ttm_operation_ctx ctx = { interruptible, false };
1210         int ret;
1211
1212         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1213                                    page_alignment, &ctx, acc_size,
1214                                    sg, resv, destroy);
1215         if (ret)
1216                 return ret;
1217
1218         if (!resv)
1219                 ttm_bo_unreserve(bo);
1220
1221         return 0;
1222 }
1223 EXPORT_SYMBOL(ttm_bo_init);
1224
1225 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1226                            unsigned long bo_size,
1227                            unsigned struct_size)
1228 {
1229         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1230         size_t size = 0;
1231
1232         size += ttm_round_pot(struct_size);
1233         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1234         size += ttm_round_pot(sizeof(struct ttm_tt));
1235         return size;
1236 }
1237 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1238
1239 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1240 {
1241         struct ttm_bo_global *glob =
1242                 container_of(kobj, struct ttm_bo_global, kobj);
1243
1244         __free_page(glob->dummy_read_page);
1245 }
1246
1247 static void ttm_bo_global_release(void)
1248 {
1249         struct ttm_bo_global *glob = &ttm_bo_glob;
1250
1251         mutex_lock(&ttm_global_mutex);
1252         if (--ttm_bo_glob_use_count > 0)
1253                 goto out;
1254
1255         kobject_del(&glob->kobj);
1256         kobject_put(&glob->kobj);
1257         ttm_mem_global_release(&ttm_mem_glob);
1258         memset(glob, 0, sizeof(*glob));
1259 out:
1260         mutex_unlock(&ttm_global_mutex);
1261 }
1262
1263 static int ttm_bo_global_init(void)
1264 {
1265         struct ttm_bo_global *glob = &ttm_bo_glob;
1266         int ret = 0;
1267         unsigned i;
1268
1269         mutex_lock(&ttm_global_mutex);
1270         if (++ttm_bo_glob_use_count > 1)
1271                 goto out;
1272
1273         ret = ttm_mem_global_init(&ttm_mem_glob);
1274         if (ret)
1275                 goto out;
1276
1277         spin_lock_init(&glob->lru_lock);
1278         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1279
1280         if (unlikely(glob->dummy_read_page == NULL)) {
1281                 ret = -ENOMEM;
1282                 goto out;
1283         }
1284
1285         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1286                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1287         INIT_LIST_HEAD(&glob->device_list);
1288         atomic_set(&glob->bo_count, 0);
1289
1290         ret = kobject_init_and_add(
1291                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1292         if (unlikely(ret != 0))
1293                 kobject_put(&glob->kobj);
1294 out:
1295         mutex_unlock(&ttm_global_mutex);
1296         return ret;
1297 }
1298
1299 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1300 {
1301         struct ttm_bo_global *glob = &ttm_bo_glob;
1302         int ret = 0;
1303         unsigned i;
1304         struct ttm_resource_manager *man;
1305
1306         man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
1307         ttm_resource_manager_set_used(man, false);
1308         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
1309
1310         mutex_lock(&ttm_global_mutex);
1311         list_del(&bdev->device_list);
1312         mutex_unlock(&ttm_global_mutex);
1313
1314         cancel_delayed_work_sync(&bdev->wq);
1315
1316         if (ttm_bo_delayed_delete(bdev, true))
1317                 pr_debug("Delayed destroy list was clean\n");
1318
1319         spin_lock(&glob->lru_lock);
1320         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1321                 if (list_empty(&man->lru[0]))
1322                         pr_debug("Swap list %d was clean\n", i);
1323         spin_unlock(&glob->lru_lock);
1324
1325         ttm_pool_fini(&bdev->pool);
1326
1327         if (!ret)
1328                 ttm_bo_global_release();
1329
1330         return ret;
1331 }
1332 EXPORT_SYMBOL(ttm_bo_device_release);
1333
1334 static void ttm_bo_init_sysman(struct ttm_bo_device *bdev)
1335 {
1336         struct ttm_resource_manager *man = &bdev->sysman;
1337
1338         /*
1339          * Initialize the system memory buffer type.
1340          * Other types need to be driver / IOCTL initialized.
1341          */
1342         man->use_tt = true;
1343
1344         ttm_resource_manager_init(man, 0);
1345         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, man);
1346         ttm_resource_manager_set_used(man, true);
1347 }
1348
1349 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1350                        struct ttm_bo_driver *driver,
1351                        struct device *dev,
1352                        struct address_space *mapping,
1353                        struct drm_vma_offset_manager *vma_manager,
1354                        bool use_dma_alloc, bool use_dma32)
1355 {
1356         struct ttm_bo_global *glob = &ttm_bo_glob;
1357         int ret;
1358
1359         if (WARN_ON(vma_manager == NULL))
1360                 return -EINVAL;
1361
1362         ret = ttm_bo_global_init();
1363         if (ret)
1364                 return ret;
1365
1366         bdev->driver = driver;
1367
1368         ttm_bo_init_sysman(bdev);
1369         ttm_pool_init(&bdev->pool, dev, use_dma_alloc, use_dma32);
1370
1371         bdev->vma_manager = vma_manager;
1372         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1373         INIT_LIST_HEAD(&bdev->ddestroy);
1374         bdev->dev_mapping = mapping;
1375         mutex_lock(&ttm_global_mutex);
1376         list_add_tail(&bdev->device_list, &glob->device_list);
1377         mutex_unlock(&ttm_global_mutex);
1378
1379         return 0;
1380 }
1381 EXPORT_SYMBOL(ttm_bo_device_init);
1382
1383 /*
1384  * buffer object vm functions.
1385  */
1386
1387 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1388 {
1389         struct ttm_bo_device *bdev = bo->bdev;
1390
1391         drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1392         ttm_mem_io_free(bdev, &bo->mem);
1393 }
1394 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1395
1396 int ttm_bo_wait(struct ttm_buffer_object *bo,
1397                 bool interruptible, bool no_wait)
1398 {
1399         long timeout = 15 * HZ;
1400
1401         if (no_wait) {
1402                 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1403                         return 0;
1404                 else
1405                         return -EBUSY;
1406         }
1407
1408         timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1409                                                       interruptible, timeout);
1410         if (timeout < 0)
1411                 return timeout;
1412
1413         if (timeout == 0)
1414                 return -EBUSY;
1415
1416         dma_resv_add_excl_fence(bo->base.resv, NULL);
1417         return 0;
1418 }
1419 EXPORT_SYMBOL(ttm_bo_wait);
1420
1421 /*
1422  * A buffer object shrink method that tries to swap out the first
1423  * buffer object on the bo_global::swap_lru list.
1424  */
1425 int ttm_bo_swapout(struct ttm_operation_ctx *ctx)
1426 {
1427         struct ttm_bo_global *glob = &ttm_bo_glob;
1428         struct ttm_buffer_object *bo;
1429         int ret = -EBUSY;
1430         bool locked;
1431         unsigned i;
1432
1433         spin_lock(&glob->lru_lock);
1434         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1435                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1436                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1437                                                             NULL))
1438                                 continue;
1439
1440                         if (!ttm_bo_get_unless_zero(bo)) {
1441                                 if (locked)
1442                                         dma_resv_unlock(bo->base.resv);
1443                                 continue;
1444                         }
1445
1446                         ret = 0;
1447                         break;
1448                 }
1449                 if (!ret)
1450                         break;
1451         }
1452
1453         if (ret) {
1454                 spin_unlock(&glob->lru_lock);
1455                 return ret;
1456         }
1457
1458         if (bo->deleted) {
1459                 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1460                 ttm_bo_put(bo);
1461                 return ret;
1462         }
1463
1464         ttm_bo_del_from_lru(bo);
1465         spin_unlock(&glob->lru_lock);
1466
1467         /**
1468          * Move to system cached
1469          */
1470
1471         if (bo->mem.mem_type != TTM_PL_SYSTEM) {
1472                 struct ttm_operation_ctx ctx = { false, false };
1473                 struct ttm_resource evict_mem;
1474                 struct ttm_place hop;
1475
1476                 memset(&hop, 0, sizeof(hop));
1477
1478                 evict_mem = bo->mem;
1479                 evict_mem.mm_node = NULL;
1480                 evict_mem.placement = 0;
1481                 evict_mem.mem_type = TTM_PL_SYSTEM;
1482
1483                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx, &hop);
1484                 if (unlikely(ret != 0)) {
1485                         WARN(ret == -EMULTIHOP, "Unexpected multihop in swaput - likely driver bug.\n");
1486                         goto out;
1487                 }
1488         }
1489
1490         /**
1491          * Make sure BO is idle.
1492          */
1493
1494         ret = ttm_bo_wait(bo, false, false);
1495         if (unlikely(ret != 0))
1496                 goto out;
1497
1498         ttm_bo_unmap_virtual(bo);
1499
1500         /**
1501          * Swap out. Buffer will be swapped in again as soon as
1502          * anyone tries to access a ttm page.
1503          */
1504
1505         if (bo->bdev->driver->swap_notify)
1506                 bo->bdev->driver->swap_notify(bo);
1507
1508         ret = ttm_tt_swapout(bo->bdev, bo->ttm);
1509 out:
1510
1511         /**
1512          *
1513          * Unreserve without putting on LRU to avoid swapping out an
1514          * already swapped buffer.
1515          */
1516         if (locked)
1517                 dma_resv_unlock(bo->base.resv);
1518         ttm_bo_put(bo);
1519         return ret;
1520 }
1521 EXPORT_SYMBOL(ttm_bo_swapout);
1522
1523 void ttm_bo_tt_destroy(struct ttm_buffer_object *bo)
1524 {
1525         if (bo->ttm == NULL)
1526                 return;
1527
1528         ttm_tt_destroy(bo->bdev, bo->ttm);
1529         bo->ttm = NULL;
1530 }
1531