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 /* default destructor */
  48 static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
  49 {
  50         kfree(bo);
  51 }
  52
  53 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  54                                         struct ttm_placement *placement)
  55 {
  56         struct drm_printer p = drm_debug_printer(TTM_PFX);
  57         struct ttm_resource_manager *man;
  58         int i, mem_type;
  59
  60         drm_printf(&p, "No space for %p (%lu pages, %zuK, %zuM)\n",
  61                    bo, bo->mem.num_pages, bo->base.size >> 10,
  62                    bo->base.size >> 20);
  63         for (i = 0; i < placement->num_placement; i++) {
  64                 mem_type = placement->placement[i].mem_type;
  65                 drm_printf(&p, "  placement[%d]=0x%08X (%d)\n",
  66                            i, placement->placement[i].flags, mem_type);
  67                 man = ttm_manager_type(bo->bdev, mem_type);
  68                 ttm_resource_manager_debug(man, &p);
  69         }
  70 }
  71
  72 static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
  73 {
  74         struct ttm_device *bdev = bo->bdev;
  75
  76         list_del_init(&bo->lru);
  77
  78         if (bdev->funcs->del_from_lru_notify)
  79                 bdev->funcs->del_from_lru_notify(bo);
  80 }
  81
  82 static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
  83                                      struct ttm_buffer_object *bo)
  84 {
  85         if (!pos->first)
  86                 pos->first = bo;
  87         pos->last = bo;
  88 }
  89
  90 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
  91                              struct ttm_resource *mem,
  92                              struct ttm_lru_bulk_move *bulk)
  93 {
  94         struct ttm_device *bdev = bo->bdev;
  95         struct ttm_resource_manager *man;
  96
  97         if (!bo->deleted)
  98                 dma_resv_assert_held(bo->base.resv);
  99
 100         if (bo->pin_count) {
 101                 ttm_bo_del_from_lru(bo);
 102                 return;
 103         }
 104
 105         man = ttm_manager_type(bdev, mem->mem_type);
 106         list_move_tail(&bo->lru, &man->lru[bo->priority]);
 107
 108         if (bdev->funcs->del_from_lru_notify)
 109                 bdev->funcs->del_from_lru_notify(bo);
 110
 111         if (bulk && !bo->pin_count) {
 112                 switch (bo->mem.mem_type) {
 113                 case TTM_PL_TT:
 114                         ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
 115                         break;
 116
 117                 case TTM_PL_VRAM:
 118                         ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
 119                         break;
 120                 }
 121         }
 122 }
 123 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 124
 125 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
 126 {
 127         unsigned i;
 128
 129         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 130                 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
 131                 struct ttm_resource_manager *man;
 132
 133                 if (!pos->first)
 134                         continue;
 135
 136                 dma_resv_assert_held(pos->first->base.resv);
 137                 dma_resv_assert_held(pos->last->base.resv);
 138
 139                 man = ttm_manager_type(pos->first->bdev, TTM_PL_TT);
 140                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 141                                     &pos->last->lru);
 142         }
 143
 144         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 145                 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
 146                 struct ttm_resource_manager *man;
 147
 148                 if (!pos->first)
 149                         continue;
 150
 151                 dma_resv_assert_held(pos->first->base.resv);
 152                 dma_resv_assert_held(pos->last->base.resv);
 153
 154                 man = ttm_manager_type(pos->first->bdev, TTM_PL_VRAM);
 155                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 156                                     &pos->last->lru);
 157         }
 158 }
 159 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
 160
 161 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 162                                   struct ttm_resource *mem, bool evict,
 163                                   struct ttm_operation_ctx *ctx,
 164                                   struct ttm_place *hop)
 165 {
 166         struct ttm_device *bdev = bo->bdev;
 167         struct ttm_resource_manager *old_man = ttm_manager_type(bdev, bo->mem.mem_type);
 168         struct ttm_resource_manager *new_man = ttm_manager_type(bdev, mem->mem_type);
 169         int ret;
 170
 171         ttm_bo_unmap_virtual(bo);
 172
 173         /*
 174          * Create and bind a ttm if required.
 175          */
 176
 177         if (new_man->use_tt) {
 178                 /* Zero init the new TTM structure if the old location should
 179                  * have used one as well.
 180                  */
 181                 ret = ttm_tt_create(bo, old_man->use_tt);
 182                 if (ret)
 183                         goto out_err;
 184
 185                 if (mem->mem_type != TTM_PL_SYSTEM) {
 186                         ret = ttm_tt_populate(bo->bdev, bo->ttm, ctx);
 187                         if (ret)
 188                                 goto out_err;
 189                 }
 190         }
 191
 192         ret = bdev->funcs->move(bo, evict, ctx, mem, hop);
 193         if (ret) {
 194                 if (ret == -EMULTIHOP)
 195                         return ret;
 196                 goto out_err;
 197         }
 198
 199         ctx->bytes_moved += bo->base.size;
 200         return 0;
 201
 202 out_err:
 203         new_man = ttm_manager_type(bdev, bo->mem.mem_type);
 204         if (!new_man->use_tt)
 205                 ttm_bo_tt_destroy(bo);
 206
 207         return ret;
 208 }
 209
 210 /*
 211  * Call bo::reserved.
 212  * Will release GPU memory type usage on destruction.
 213  * This is the place to put in driver specific hooks to release
 214  * driver private resources.
 215  * Will release the bo::reserved lock.
 216  */
 217
 218 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 219 {
 220         if (bo->bdev->funcs->delete_mem_notify)
 221                 bo->bdev->funcs->delete_mem_notify(bo);
 222
 223         ttm_bo_tt_destroy(bo);
 224         ttm_resource_free(bo, &bo->mem);
 225 }
 226
 227 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 228 {
 229         int r;
 230
 231         if (bo->base.resv == &bo->base._resv)
 232                 return 0;
 233
 234         BUG_ON(!dma_resv_trylock(&bo->base._resv));
 235
 236         r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
 237         dma_resv_unlock(&bo->base._resv);
 238         if (r)
 239                 return r;
 240
 241         if (bo->type != ttm_bo_type_sg) {
 242                 /* This works because the BO is about to be destroyed and nobody
 243                  * reference it any more. The only tricky case is the trylock on
 244                  * the resv object while holding the lru_lock.
 245                  */
 246                 spin_lock(&bo->bdev->lru_lock);
 247                 bo->base.resv = &bo->base._resv;
 248                 spin_unlock(&bo->bdev->lru_lock);
 249         }
 250
 251         return r;
 252 }
 253
 254 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 255 {
 256         struct dma_resv *resv = &bo->base._resv;
 257         struct dma_resv_list *fobj;
 258         struct dma_fence *fence;
 259         int i;
 260
 261         rcu_read_lock();
 262         fobj = rcu_dereference(resv->fence);
 263         fence = rcu_dereference(resv->fence_excl);
 264         if (fence && !fence->ops->signaled)
 265                 dma_fence_enable_sw_signaling(fence);
 266
 267         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 268                 fence = rcu_dereference(fobj->shared[i]);
 269
 270                 if (!fence->ops->signaled)
 271                         dma_fence_enable_sw_signaling(fence);
 272         }
 273         rcu_read_unlock();
 274 }
 275
 276 /**
 277  * function ttm_bo_cleanup_refs
 278  * If bo idle, remove from lru lists, and unref.
 279  * If not idle, block if possible.
 280  *
 281  * Must be called with lru_lock and reservation held, this function
 282  * will drop the lru lock and optionally the reservation lock before returning.
 283  *
 284  * @bo:                    The buffer object to clean-up
 285  * @interruptible:         Any sleeps should occur interruptibly.
 286  * @no_wait_gpu:           Never wait for gpu. Return -EBUSY instead.
 287  * @unlock_resv:           Unlock the reservation lock as well.
 288  */
 289
 290 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 291                                bool interruptible, bool no_wait_gpu,
 292                                bool unlock_resv)
 293 {
 294         struct dma_resv *resv = &bo->base._resv;
 295         int ret;
 296
 297         if (dma_resv_test_signaled_rcu(resv, true))
 298                 ret = 0;
 299         else
 300                 ret = -EBUSY;
 301
 302         if (ret && !no_wait_gpu) {
 303                 long lret;
 304
 305                 if (unlock_resv)
 306                         dma_resv_unlock(bo->base.resv);
 307                 spin_unlock(&bo->bdev->lru_lock);
 308
 309                 lret = dma_resv_wait_timeout_rcu(resv, true, interruptible,
 310                                                  30 * HZ);
 311
 312                 if (lret < 0)
 313                         return lret;
 314                 else if (lret == 0)
 315                         return -EBUSY;
 316
 317                 spin_lock(&bo->bdev->lru_lock);
 318                 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
 319                         /*
 320                          * We raced, and lost, someone else holds the reservation now,
 321                          * and is probably busy in ttm_bo_cleanup_memtype_use.
 322                          *
 323                          * Even if it's not the case, because we finished waiting any
 324                          * delayed destruction would succeed, so just return success
 325                          * here.
 326                          */
 327                         spin_unlock(&bo->bdev->lru_lock);
 328                         return 0;
 329                 }
 330                 ret = 0;
 331         }
 332
 333         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 334                 if (unlock_resv)
 335                         dma_resv_unlock(bo->base.resv);
 336                 spin_unlock(&bo->bdev->lru_lock);
 337                 return ret;
 338         }
 339
 340         ttm_bo_del_from_lru(bo);
 341         list_del_init(&bo->ddestroy);
 342         spin_unlock(&bo->bdev->lru_lock);
 343         ttm_bo_cleanup_memtype_use(bo);
 344
 345         if (unlock_resv)
 346                 dma_resv_unlock(bo->base.resv);
 347
 348         ttm_bo_put(bo);
 349
 350         return 0;
 351 }
 352
 353 /*
 354  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 355  * encountered buffers.
 356  */
 357 bool ttm_bo_delayed_delete(struct ttm_device *bdev, bool remove_all)
 358 {
 359         struct list_head removed;
 360         bool empty;
 361
 362         INIT_LIST_HEAD(&removed);
 363
 364         spin_lock(&bdev->lru_lock);
 365         while (!list_empty(&bdev->ddestroy)) {
 366                 struct ttm_buffer_object *bo;
 367
 368                 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
 369                                       ddestroy);
 370                 list_move_tail(&bo->ddestroy, &removed);
 371                 if (!ttm_bo_get_unless_zero(bo))
 372                         continue;
 373
 374                 if (remove_all || bo->base.resv != &bo->base._resv) {
 375                         spin_unlock(&bdev->lru_lock);
 376                         dma_resv_lock(bo->base.resv, NULL);
 377
 378                         spin_lock(&bdev->lru_lock);
 379                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 380
 381                 } else if (dma_resv_trylock(bo->base.resv)) {
 382                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 383                 } else {
 384                         spin_unlock(&bdev->lru_lock);
 385                 }
 386
 387                 ttm_bo_put(bo);
 388                 spin_lock(&bdev->lru_lock);
 389         }
 390         list_splice_tail(&removed, &bdev->ddestroy);
 391         empty = list_empty(&bdev->ddestroy);
 392         spin_unlock(&bdev->lru_lock);
 393
 394         return empty;
 395 }
 396
 397 static void ttm_bo_release(struct kref *kref)
 398 {
 399         struct ttm_buffer_object *bo =
 400             container_of(kref, struct ttm_buffer_object, kref);
 401         struct ttm_device *bdev = bo->bdev;
 402         int ret;
 403
 404         if (!bo->deleted) {
 405                 ret = ttm_bo_individualize_resv(bo);
 406                 if (ret) {
 407                         /* Last resort, if we fail to allocate memory for the
 408                          * fences block for the BO to become idle
 409                          */
 410                         dma_resv_wait_timeout_rcu(bo->base.resv, true, false,
 411                                                   30 * HZ);
 412                 }
 413
 414                 if (bo->bdev->funcs->release_notify)
 415                         bo->bdev->funcs->release_notify(bo);
 416
 417                 drm_vma_offset_remove(bdev->vma_manager, &bo->base.vma_node);
 418                 ttm_mem_io_free(bdev, &bo->mem);
 419         }
 420
 421         if (!dma_resv_test_signaled_rcu(bo->base.resv, true) ||
 422             !dma_resv_trylock(bo->base.resv)) {
 423                 /* The BO is not idle, resurrect it for delayed destroy */
 424                 ttm_bo_flush_all_fences(bo);
 425                 bo->deleted = true;
 426
 427                 spin_lock(&bo->bdev->lru_lock);
 428
 429                 /*
 430                  * Make pinned bos immediately available to
 431                  * shrinkers, now that they are queued for
 432                  * destruction.
 433                  *
 434                  * FIXME: QXL is triggering this. Can be removed when the
 435                  * driver is fixed.
 436                  */
 437                 if (WARN_ON_ONCE(bo->pin_count)) {
 438                         bo->pin_count = 0;
 439                         ttm_bo_move_to_lru_tail(bo, &bo->mem, NULL);
 440                 }
 441
 442                 kref_init(&bo->kref);
 443                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 444                 spin_unlock(&bo->bdev->lru_lock);
 445
 446                 schedule_delayed_work(&bdev->wq,
 447                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 448                 return;
 449         }
 450
 451         spin_lock(&bo->bdev->lru_lock);
 452         ttm_bo_del_from_lru(bo);
 453         list_del(&bo->ddestroy);
 454         spin_unlock(&bo->bdev->lru_lock);
 455
 456         ttm_bo_cleanup_memtype_use(bo);
 457         dma_resv_unlock(bo->base.resv);
 458
 459         atomic_dec(&ttm_glob.bo_count);
 460         dma_fence_put(bo->moving);
 461         if (!ttm_bo_uses_embedded_gem_object(bo))
 462                 dma_resv_fini(&bo->base._resv);
 463         bo->destroy(bo);
 464 }
 465
 466 void ttm_bo_put(struct ttm_buffer_object *bo)
 467 {
 468         kref_put(&bo->kref, ttm_bo_release);
 469 }
 470 EXPORT_SYMBOL(ttm_bo_put);
 471
 472 int ttm_bo_lock_delayed_workqueue(struct ttm_device *bdev)
 473 {
 474         return cancel_delayed_work_sync(&bdev->wq);
 475 }
 476 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 477
 478 void ttm_bo_unlock_delayed_workqueue(struct ttm_device *bdev, int resched)
 479 {
 480         if (resched)
 481                 schedule_delayed_work(&bdev->wq,
 482                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 483 }
 484 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 485
 486 static int ttm_bo_evict(struct ttm_buffer_object *bo,
 487                         struct ttm_operation_ctx *ctx)
 488 {
 489         struct ttm_device *bdev = bo->bdev;
 490         struct ttm_resource evict_mem;
 491         struct ttm_placement placement;
 492         struct ttm_place hop;
 493         int ret = 0;
 494
 495         memset(&hop, 0, sizeof(hop));
 496
 497         dma_resv_assert_held(bo->base.resv);
 498
 499         placement.num_placement = 0;
 500         placement.num_busy_placement = 0;
 501         bdev->funcs->evict_flags(bo, &placement);
 502
 503         if (!placement.num_placement && !placement.num_busy_placement) {
 504                 ttm_bo_wait(bo, false, false);
 505
 506                 ttm_bo_cleanup_memtype_use(bo);
 507                 return ttm_tt_create(bo, false);
 508         }
 509
 510         evict_mem = bo->mem;
 511         evict_mem.mm_node = NULL;
 512         evict_mem.bus.offset = 0;
 513         evict_mem.bus.addr = NULL;
 514
 515         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 516         if (ret) {
 517                 if (ret != -ERESTARTSYS) {
 518                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 519                                bo);
 520                         ttm_bo_mem_space_debug(bo, &placement);
 521                 }
 522                 goto out;
 523         }
 524
 525         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx, &hop);
 526         if (unlikely(ret)) {
 527                 WARN(ret == -EMULTIHOP, "Unexpected multihop in eviction - likely driver bug\n");
 528                 if (ret != -ERESTARTSYS)
 529                         pr_err("Buffer eviction failed\n");
 530                 ttm_resource_free(bo, &evict_mem);
 531         }
 532 out:
 533         return ret;
 534 }
 535
 536 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 537                               const struct ttm_place *place)
 538 {
 539         /* Don't evict this BO if it's outside of the
 540          * requested placement range
 541          */
 542         if (place->fpfn >= (bo->mem.start + bo->mem.num_pages) ||
 543             (place->lpfn && place->lpfn <= bo->mem.start))
 544                 return false;
 545
 546         return true;
 547 }
 548 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 549
 550 /*
 551  * Check the target bo is allowable to be evicted or swapout, including cases:
 552  *
 553  * a. if share same reservation object with ctx->resv, have assumption
 554  * reservation objects should already be locked, so not lock again and
 555  * return true directly when either the opreation allow_reserved_eviction
 556  * or the target bo already is in delayed free list;
 557  *
 558  * b. Otherwise, trylock it.
 559  */
 560 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 561                         struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
 562 {
 563         bool ret = false;
 564
 565         if (bo->base.resv == ctx->resv) {
 566                 dma_resv_assert_held(bo->base.resv);
 567                 if (ctx->allow_res_evict)
 568                         ret = true;
 569                 *locked = false;
 570                 if (busy)
 571                         *busy = false;
 572         } else {
 573                 ret = dma_resv_trylock(bo->base.resv);
 574                 *locked = ret;
 575                 if (busy)
 576                         *busy = !ret;
 577         }
 578
 579         return ret;
 580 }
 581
 582 /**
 583  * ttm_mem_evict_wait_busy - wait for a busy BO to become available
 584  *
 585  * @busy_bo: BO which couldn't be locked with trylock
 586  * @ctx: operation context
 587  * @ticket: acquire ticket
 588  *
 589  * Try to lock a busy buffer object to avoid failing eviction.
 590  */
 591 static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
 592                                    struct ttm_operation_ctx *ctx,
 593                                    struct ww_acquire_ctx *ticket)
 594 {
 595         int r;
 596
 597         if (!busy_bo || !ticket)
 598                 return -EBUSY;
 599
 600         if (ctx->interruptible)
 601                 r = dma_resv_lock_interruptible(busy_bo->base.resv,
 602                                                           ticket);
 603         else
 604                 r = dma_resv_lock(busy_bo->base.resv, ticket);
 605
 606         /*
 607          * TODO: It would be better to keep the BO locked until allocation is at
 608          * least tried one more time, but that would mean a much larger rework
 609          * of TTM.
 610          */
 611         if (!r)
 612                 dma_resv_unlock(busy_bo->base.resv);
 613
 614         return r == -EDEADLK ? -EBUSY : r;
 615 }
 616
 617 int ttm_mem_evict_first(struct ttm_device *bdev,
 618                         struct ttm_resource_manager *man,
 619                         const struct ttm_place *place,
 620                         struct ttm_operation_ctx *ctx,
 621                         struct ww_acquire_ctx *ticket)
 622 {
 623         struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
 624         bool locked = false;
 625         unsigned i;
 626         int ret;
 627
 628         spin_lock(&bdev->lru_lock);
 629         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 630                 list_for_each_entry(bo, &man->lru[i], lru) {
 631                         bool busy;
 632
 633                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
 634                                                             &busy)) {
 635                                 if (busy && !busy_bo && ticket !=
 636                                     dma_resv_locking_ctx(bo->base.resv))
 637                                         busy_bo = bo;
 638                                 continue;
 639                         }
 640
 641                         if (place && !bdev->funcs->eviction_valuable(bo,
 642                                                                       place)) {
 643                                 if (locked)
 644                                         dma_resv_unlock(bo->base.resv);
 645                                 continue;
 646                         }
 647                         if (!ttm_bo_get_unless_zero(bo)) {
 648                                 if (locked)
 649                                         dma_resv_unlock(bo->base.resv);
 650                                 continue;
 651                         }
 652                         break;
 653                 }
 654
 655                 /* If the inner loop terminated early, we have our candidate */
 656                 if (&bo->lru != &man->lru[i])
 657                         break;
 658
 659                 bo = NULL;
 660         }
 661
 662         if (!bo) {
 663                 if (busy_bo && !ttm_bo_get_unless_zero(busy_bo))
 664                         busy_bo = NULL;
 665                 spin_unlock(&bdev->lru_lock);
 666                 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
 667                 if (busy_bo)
 668                         ttm_bo_put(busy_bo);
 669                 return ret;
 670         }
 671
 672         if (bo->deleted) {
 673                 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
 674                                           ctx->no_wait_gpu, locked);
 675                 ttm_bo_put(bo);
 676                 return ret;
 677         }
 678
 679         spin_unlock(&bdev->lru_lock);
 680
 681         ret = ttm_bo_evict(bo, ctx);
 682         if (locked)
 683                 ttm_bo_unreserve(bo);
 684
 685         ttm_bo_put(bo);
 686         return ret;
 687 }
 688
 689 /*
 690  * Add the last move fence to the BO and reserve a new shared slot.
 691  */
 692 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 693                                  struct ttm_resource_manager *man,
 694                                  struct ttm_resource *mem,
 695                                  bool no_wait_gpu)
 696 {
 697         struct dma_fence *fence;
 698         int ret;
 699
 700         spin_lock(&man->move_lock);
 701         fence = dma_fence_get(man->move);
 702         spin_unlock(&man->move_lock);
 703
 704         if (!fence)
 705                 return 0;
 706
 707         if (no_wait_gpu) {
 708                 dma_fence_put(fence);
 709                 return -EBUSY;
 710         }
 711
 712         dma_resv_add_shared_fence(bo->base.resv, fence);
 713
 714         ret = dma_resv_reserve_shared(bo->base.resv, 1);
 715         if (unlikely(ret)) {
 716                 dma_fence_put(fence);
 717                 return ret;
 718         }
 719
 720         dma_fence_put(bo->moving);
 721         bo->moving = fence;
 722         return 0;
 723 }
 724
 725 /*
 726  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 727  * space, or we've evicted everything and there isn't enough space.
 728  */
 729 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 730                                   const struct ttm_place *place,
 731                                   struct ttm_resource *mem,
 732                                   struct ttm_operation_ctx *ctx)
 733 {
 734         struct ttm_device *bdev = bo->bdev;
 735         struct ttm_resource_manager *man = ttm_manager_type(bdev, mem->mem_type);
 736         struct ww_acquire_ctx *ticket;
 737         int ret;
 738
 739         ticket = dma_resv_locking_ctx(bo->base.resv);
 740         do {
 741                 ret = ttm_resource_alloc(bo, place, mem);
 742                 if (likely(!ret))
 743                         break;
 744                 if (unlikely(ret != -ENOSPC))
 745                         return ret;
 746                 ret = ttm_mem_evict_first(bdev, man, place, ctx,
 747                                           ticket);
 748                 if (unlikely(ret != 0))
 749                         return ret;
 750         } while (1);
 751
 752         return ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
 753 }
 754
 755 /**
 756  * ttm_bo_mem_placement - check if placement is compatible
 757  * @bo: BO to find memory for
 758  * @place: where to search
 759  * @mem: the memory object to fill in
 760  *
 761  * Check if placement is compatible and fill in mem structure.
 762  * Returns -EBUSY if placement won't work or negative error code.
 763  * 0 when placement can be used.
 764  */
 765 static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
 766                                 const struct ttm_place *place,
 767                                 struct ttm_resource *mem)
 768 {
 769         struct ttm_device *bdev = bo->bdev;
 770         struct ttm_resource_manager *man;
 771
 772         man = ttm_manager_type(bdev, place->mem_type);
 773         if (!man || !ttm_resource_manager_used(man))
 774                 return -EBUSY;
 775
 776         mem->mem_type = place->mem_type;
 777         mem->placement = place->flags;
 778
 779         spin_lock(&bo->bdev->lru_lock);
 780         ttm_bo_move_to_lru_tail(bo, mem, NULL);
 781         spin_unlock(&bo->bdev->lru_lock);
 782         return 0;
 783 }
 784
 785 /*
 786  * Creates space for memory region @mem according to its type.
 787  *
 788  * This function first searches for free space in compatible memory types in
 789  * the priority order defined by the driver.  If free space isn't found, then
 790  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 791  * space.
 792  */
 793 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 794                         struct ttm_placement *placement,
 795                         struct ttm_resource *mem,
 796                         struct ttm_operation_ctx *ctx)
 797 {
 798         struct ttm_device *bdev = bo->bdev;
 799         bool type_found = false;
 800         int i, ret;
 801
 802         ret = dma_resv_reserve_shared(bo->base.resv, 1);
 803         if (unlikely(ret))
 804                 return ret;
 805
 806         for (i = 0; i < placement->num_placement; ++i) {
 807                 const struct ttm_place *place = &placement->placement[i];
 808                 struct ttm_resource_manager *man;
 809
 810                 ret = ttm_bo_mem_placement(bo, place, mem);
 811                 if (ret)
 812                         continue;
 813
 814                 type_found = true;
 815                 ret = ttm_resource_alloc(bo, place, mem);
 816                 if (ret == -ENOSPC)
 817                         continue;
 818                 if (unlikely(ret))
 819                         goto error;
 820
 821                 man = ttm_manager_type(bdev, mem->mem_type);
 822                 ret = ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
 823                 if (unlikely(ret)) {
 824                         ttm_resource_free(bo, mem);
 825                         if (ret == -EBUSY)
 826                                 continue;
 827
 828                         goto error;
 829                 }
 830                 return 0;
 831         }
 832
 833         for (i = 0; i < placement->num_busy_placement; ++i) {
 834                 const struct ttm_place *place = &placement->busy_placement[i];
 835
 836                 ret = ttm_bo_mem_placement(bo, place, mem);
 837                 if (ret)
 838                         continue;
 839
 840                 type_found = true;
 841                 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
 842                 if (likely(!ret))
 843                         return 0;
 844
 845                 if (ret && ret != -EBUSY)
 846                         goto error;
 847         }
 848
 849         ret = -ENOMEM;
 850         if (!type_found) {
 851                 pr_err(TTM_PFX "No compatible memory type found\n");
 852                 ret = -EINVAL;
 853         }
 854
 855 error:
 856         if (bo->mem.mem_type == TTM_PL_SYSTEM && !bo->pin_count)
 857                 ttm_bo_move_to_lru_tail_unlocked(bo);
 858
 859         return ret;
 860 }
 861 EXPORT_SYMBOL(ttm_bo_mem_space);
 862
 863 static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
 864                                      struct ttm_resource *mem,
 865                                      struct ttm_operation_ctx *ctx,
 866                                      struct ttm_place *hop)
 867 {
 868         struct ttm_placement hop_placement;
 869         int ret;
 870         struct ttm_resource hop_mem = *mem;
 871
 872         hop_mem.mm_node = NULL;
 873         hop_mem.mem_type = TTM_PL_SYSTEM;
 874         hop_mem.placement = 0;
 875
 876         hop_placement.num_placement = hop_placement.num_busy_placement = 1;
 877         hop_placement.placement = hop_placement.busy_placement = hop;
 878
 879         /* find space in the bounce domain */
 880         ret = ttm_bo_mem_space(bo, &hop_placement, &hop_mem, ctx);
 881         if (ret)
 882                 return ret;
 883         /* move to the bounce domain */
 884         ret = ttm_bo_handle_move_mem(bo, &hop_mem, false, ctx, NULL);
 885         if (ret) {
 886                 ttm_resource_free(bo, &hop_mem);
 887                 return ret;
 888         }
 889         return 0;
 890 }
 891
 892 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 893                               struct ttm_placement *placement,
 894                               struct ttm_operation_ctx *ctx)
 895 {
 896         int ret = 0;
 897         struct ttm_place hop;
 898         struct ttm_resource mem;
 899
 900         dma_resv_assert_held(bo->base.resv);
 901
 902         memset(&hop, 0, sizeof(hop));
 903
 904         mem.num_pages = PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT;
 905         mem.page_alignment = bo->mem.page_alignment;
 906         mem.bus.offset = 0;
 907         mem.bus.addr = NULL;
 908         mem.mm_node = NULL;
 909
 910         /*
 911          * Determine where to move the buffer.
 912          *
 913          * If driver determines move is going to need
 914          * an extra step then it will return -EMULTIHOP
 915          * and the buffer will be moved to the temporary
 916          * stop and the driver will be called to make
 917          * the second hop.
 918          */
 919         ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
 920         if (ret)
 921                 return ret;
 922 bounce:
 923         ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx, &hop);
 924         if (ret == -EMULTIHOP) {
 925                 ret = ttm_bo_bounce_temp_buffer(bo, &mem, ctx, &hop);
 926                 if (ret)
 927                         goto out;
 928                 /* try and move to final place now. */
 929                 goto bounce;
 930         }
 931 out:
 932         if (ret)
 933                 ttm_resource_free(bo, &mem);
 934         return ret;
 935 }
 936
 937 static bool ttm_bo_places_compat(const struct ttm_place *places,
 938                                  unsigned num_placement,
 939                                  struct ttm_resource *mem,
 940                                  uint32_t *new_flags)
 941 {
 942         unsigned i;
 943
 944         for (i = 0; i < num_placement; i++) {
 945                 const struct ttm_place *heap = &places[i];
 946
 947                 if ((mem->start < heap->fpfn ||
 948                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
 949                         continue;
 950
 951                 *new_flags = heap->flags;
 952                 if ((mem->mem_type == heap->mem_type) &&
 953                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
 954                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
 955                         return true;
 956         }
 957         return false;
 958 }
 959
 960 bool ttm_bo_mem_compat(struct ttm_placement *placement,
 961                        struct ttm_resource *mem,
 962                        uint32_t *new_flags)
 963 {
 964         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
 965                                  mem, new_flags))
 966                 return true;
 967
 968         if ((placement->busy_placement != placement->placement ||
 969              placement->num_busy_placement > placement->num_placement) &&
 970             ttm_bo_places_compat(placement->busy_placement,
 971                                  placement->num_busy_placement,
 972                                  mem, new_flags))
 973                 return true;
 974
 975         return false;
 976 }
 977 EXPORT_SYMBOL(ttm_bo_mem_compat);
 978
 979 int ttm_bo_validate(struct ttm_buffer_object *bo,
 980                     struct ttm_placement *placement,
 981                     struct ttm_operation_ctx *ctx)
 982 {
 983         int ret;
 984         uint32_t new_flags;
 985
 986         dma_resv_assert_held(bo->base.resv);
 987
 988         /*
 989          * Remove the backing store if no placement is given.
 990          */
 991         if (!placement->num_placement && !placement->num_busy_placement) {
 992                 ret = ttm_bo_pipeline_gutting(bo);
 993                 if (ret)
 994                         return ret;
 995
 996                 return ttm_tt_create(bo, false);
 997         }
 998
 999         /*
1000          * Check whether we need to move buffer.
1001          */
1002         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1003                 ret = ttm_bo_move_buffer(bo, placement, ctx);
1004                 if (ret)
1005                         return ret;
1006         }
1007         /*
1008          * We might need to add a TTM.
1009          */
1010         if (bo->mem.mem_type == TTM_PL_SYSTEM) {
1011                 ret = ttm_tt_create(bo, true);
1012                 if (ret)
1013                         return ret;
1014         }
1015         return 0;
1016 }
1017 EXPORT_SYMBOL(ttm_bo_validate);
1018
1019 int ttm_bo_init_reserved(struct ttm_device *bdev,
1020                          struct ttm_buffer_object *bo,
1021                          size_t size,
1022                          enum ttm_bo_type type,
1023                          struct ttm_placement *placement,
1024                          uint32_t page_alignment,
1025                          struct ttm_operation_ctx *ctx,
1026                          struct sg_table *sg,
1027                          struct dma_resv *resv,
1028                          void (*destroy) (struct ttm_buffer_object *))
1029 {
1030         bool locked;
1031         int ret = 0;
1032
1033         bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1034
1035         kref_init(&bo->kref);
1036         INIT_LIST_HEAD(&bo->lru);
1037         INIT_LIST_HEAD(&bo->ddestroy);
1038         bo->bdev = bdev;
1039         bo->type = type;
1040         bo->mem.mem_type = TTM_PL_SYSTEM;
1041         bo->mem.num_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
1042         bo->mem.mm_node = NULL;
1043         bo->mem.page_alignment = page_alignment;
1044         bo->mem.bus.offset = 0;
1045         bo->mem.bus.addr = NULL;
1046         bo->moving = NULL;
1047         bo->mem.placement = 0;
1048         bo->pin_count = 0;
1049         bo->sg = sg;
1050         if (resv) {
1051                 bo->base.resv = resv;
1052                 dma_resv_assert_held(bo->base.resv);
1053         } else {
1054                 bo->base.resv = &bo->base._resv;
1055         }
1056         if (!ttm_bo_uses_embedded_gem_object(bo)) {
1057                 /*
1058                  * bo.base is not initialized, so we have to setup the
1059                  * struct elements we want use regardless.
1060                  */
1061                 bo->base.size = size;
1062                 dma_resv_init(&bo->base._resv);
1063                 drm_vma_node_reset(&bo->base.vma_node);
1064         }
1065         atomic_inc(&ttm_glob.bo_count);
1066
1067         /*
1068          * For ttm_bo_type_device buffers, allocate
1069          * address space from the device.
1070          */
1071         if (bo->type == ttm_bo_type_device ||
1072             bo->type == ttm_bo_type_sg)
1073                 ret = drm_vma_offset_add(bdev->vma_manager, &bo->base.vma_node,
1074                                          bo->mem.num_pages);
1075
1076         /* passed reservation objects should already be locked,
1077          * since otherwise lockdep will be angered in radeon.
1078          */
1079         if (!resv) {
1080                 locked = dma_resv_trylock(bo->base.resv);
1081                 WARN_ON(!locked);
1082         }
1083
1084         if (likely(!ret))
1085                 ret = ttm_bo_validate(bo, placement, ctx);
1086
1087         if (unlikely(ret)) {
1088                 if (!resv)
1089                         ttm_bo_unreserve(bo);
1090
1091                 ttm_bo_put(bo);
1092                 return ret;
1093         }
1094
1095         ttm_bo_move_to_lru_tail_unlocked(bo);
1096
1097         return ret;
1098 }
1099 EXPORT_SYMBOL(ttm_bo_init_reserved);
1100
1101 int ttm_bo_init(struct ttm_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                 bool interruptible,
1108                 struct sg_table *sg,
1109                 struct dma_resv *resv,
1110                 void (*destroy) (struct ttm_buffer_object *))
1111 {
1112         struct ttm_operation_ctx ctx = { interruptible, false };
1113         int ret;
1114
1115         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1116                                    page_alignment, &ctx, sg, resv, destroy);
1117         if (ret)
1118                 return ret;
1119
1120         if (!resv)
1121                 ttm_bo_unreserve(bo);
1122
1123         return 0;
1124 }
1125 EXPORT_SYMBOL(ttm_bo_init);
1126
1127 /*
1128  * buffer object vm functions.
1129  */
1130
1131 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1132 {
1133         struct ttm_device *bdev = bo->bdev;
1134
1135         drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1136         ttm_mem_io_free(bdev, &bo->mem);
1137 }
1138 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1139
1140 int ttm_bo_wait(struct ttm_buffer_object *bo,
1141                 bool interruptible, bool no_wait)
1142 {
1143         long timeout = 15 * HZ;
1144
1145         if (no_wait) {
1146                 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1147                         return 0;
1148                 else
1149                         return -EBUSY;
1150         }
1151
1152         timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1153                                                       interruptible, timeout);
1154         if (timeout < 0)
1155                 return timeout;
1156
1157         if (timeout == 0)
1158                 return -EBUSY;
1159
1160         dma_resv_add_excl_fence(bo->base.resv, NULL);
1161         return 0;
1162 }
1163 EXPORT_SYMBOL(ttm_bo_wait);
1164
1165 int ttm_bo_swapout(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx,
1166                    gfp_t gfp_flags)
1167 {
1168         bool locked;
1169         int ret;
1170
1171         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked, NULL))
1172                 return -EBUSY;
1173
1174         if (!ttm_bo_get_unless_zero(bo)) {
1175                 if (locked)
1176                         dma_resv_unlock(bo->base.resv);
1177                 return -EBUSY;
1178         }
1179
1180         if (bo->deleted) {
1181                 ttm_bo_cleanup_refs(bo, false, false, locked);
1182                 ttm_bo_put(bo);
1183                 return 0;
1184         }
1185
1186         ttm_bo_del_from_lru(bo);
1187         /* TODO: Cleanup the locking */
1188         spin_unlock(&bo->bdev->lru_lock);
1189
1190         /*
1191          * Move to system cached
1192          */
1193         if (bo->mem.mem_type != TTM_PL_SYSTEM) {
1194                 struct ttm_operation_ctx ctx = { false, false };
1195                 struct ttm_resource evict_mem;
1196                 struct ttm_place hop;
1197
1198                 memset(&hop, 0, sizeof(hop));
1199
1200                 evict_mem = bo->mem;
1201                 evict_mem.mm_node = NULL;
1202                 evict_mem.placement = 0;
1203                 evict_mem.mem_type = TTM_PL_SYSTEM;
1204
1205                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx, &hop);
1206                 if (unlikely(ret != 0)) {
1207                         WARN(ret == -EMULTIHOP, "Unexpected multihop in swaput - likely driver bug.\n");
1208                         goto out;
1209                 }
1210         }
1211
1212         /*
1213          * Make sure BO is idle.
1214          */
1215         ret = ttm_bo_wait(bo, false, false);
1216         if (unlikely(ret != 0))
1217                 goto out;
1218
1219         ttm_bo_unmap_virtual(bo);
1220
1221         /*
1222          * Swap out. Buffer will be swapped in again as soon as
1223          * anyone tries to access a ttm page.
1224          */
1225         if (bo->bdev->funcs->swap_notify)
1226                 bo->bdev->funcs->swap_notify(bo);
1227
1228         ret = ttm_tt_swapout(bo->bdev, bo->ttm, gfp_flags);
1229 out:
1230
1231         /*
1232          * Unreserve without putting on LRU to avoid swapping out an
1233          * already swapped buffer.
1234          */
1235         if (locked)
1236                 dma_resv_unlock(bo->base.resv);
1237         ttm_bo_put(bo);
1238         return ret;
1239 }
1240
1241 void ttm_bo_tt_destroy(struct ttm_buffer_object *bo)
1242 {
1243         if (bo->ttm == NULL)
1244                 return;
1245
1246         ttm_tt_destroy(bo->bdev, bo->ttm);
1247         bo->ttm = NULL;
1248 }