drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #define pr_fmt(fmt) "[TTM] " fmt
  32
  33 #include <drm/ttm/ttm_module.h>
  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/reservation.h>
  44
  45 #define TTM_ASSERT_LOCKED(param)
  46 #define TTM_DEBUG(fmt, arg...)
  47 #define TTM_BO_HASH_ORDER 13
  48
  49 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  50 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  51
  52 static struct attribute ttm_bo_count = {
  53         .name = "bo_count",
  54         .mode = S_IRUGO
  55 };
  56
  57 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
  58                                           uint32_t *mem_type)
  59 {
  60         int pos;
  61
  62         pos = ffs(place->flags & TTM_PL_MASK_MEM);
  63         if (unlikely(!pos))
  64                 return -EINVAL;
  65
  66         *mem_type = pos - 1;
  67         return 0;
  68 }
  69
  70 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  71 {
  72         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  73
  74         pr_err("    has_type: %d\n", man->has_type);
  75         pr_err("    use_type: %d\n", man->use_type);
  76         pr_err("    flags: 0x%08X\n", man->flags);
  77         pr_err("    gpu_offset: 0x%08llX\n", man->gpu_offset);
  78         pr_err("    size: %llu\n", man->size);
  79         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  80         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  81         if (mem_type != TTM_PL_SYSTEM)
  82                 (*man->func->debug)(man, TTM_PFX);
  83 }
  84
  85 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  86                                         struct ttm_placement *placement)
  87 {
  88         int i, ret, mem_type;
  89
  90         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  91                bo, bo->mem.num_pages, bo->mem.size >> 10,
  92                bo->mem.size >> 20);
  93         for (i = 0; i < placement->num_placement; i++) {
  94                 ret = ttm_mem_type_from_place(&placement->placement[i],
  95                                                 &mem_type);
  96                 if (ret)
  97                         return;
  98                 pr_err("  placement[%d]=0x%08X (%d)\n",
  99                        i, placement->placement[i].flags, mem_type);
 100                 ttm_mem_type_debug(bo->bdev, mem_type);
 101         }
 102 }
 103
 104 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 105                                   struct attribute *attr,
 106                                   char *buffer)
 107 {
 108         struct ttm_bo_global *glob =
 109                 container_of(kobj, struct ttm_bo_global, kobj);
 110
 111         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 112                         (unsigned long) atomic_read(&glob->bo_count));
 113 }
 114
 115 static struct attribute *ttm_bo_global_attrs[] = {
 116         &ttm_bo_count,
 117         NULL
 118 };
 119
 120 static const struct sysfs_ops ttm_bo_global_ops = {
 121         .show = &ttm_bo_global_show
 122 };
 123
 124 static struct kobj_type ttm_bo_glob_kobj_type  = {
 125         .release = &ttm_bo_global_kobj_release,
 126         .sysfs_ops = &ttm_bo_global_ops,
 127         .default_attrs = ttm_bo_global_attrs
 128 };
 129
 130
 131 static inline uint32_t ttm_bo_type_flags(unsigned type)
 132 {
 133         return 1 << (type);
 134 }
 135
 136 static void ttm_bo_release_list(struct kref *list_kref)
 137 {
 138         struct ttm_buffer_object *bo =
 139             container_of(list_kref, struct ttm_buffer_object, list_kref);
 140         struct ttm_bo_device *bdev = bo->bdev;
 141         size_t acc_size = bo->acc_size;
 142
 143         BUG_ON(kref_read(&bo->list_kref));
 144         BUG_ON(kref_read(&bo->kref));
 145         BUG_ON(atomic_read(&bo->cpu_writers));
 146         BUG_ON(bo->mem.mm_node != NULL);
 147         BUG_ON(!list_empty(&bo->lru));
 148         BUG_ON(!list_empty(&bo->ddestroy));
 149         ttm_tt_destroy(bo->ttm);
 150         atomic_dec(&bo->glob->bo_count);
 151         dma_fence_put(bo->moving);
 152         if (bo->resv == &bo->ttm_resv)
 153                 reservation_object_fini(&bo->ttm_resv);
 154         mutex_destroy(&bo->wu_mutex);
 155         if (bo->destroy)
 156                 bo->destroy(bo);
 157         else {
 158                 kfree(bo);
 159         }
 160         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 161 }
 162
 163 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 164 {
 165         struct ttm_bo_device *bdev = bo->bdev;
 166         struct ttm_mem_type_manager *man;
 167
 168         lockdep_assert_held(&bo->resv->lock.base);
 169
 170         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 171
 172                 BUG_ON(!list_empty(&bo->lru));
 173
 174                 man = &bdev->man[bo->mem.mem_type];
 175                 list_add_tail(&bo->lru, &man->lru[bo->priority]);
 176                 kref_get(&bo->list_kref);
 177
 178                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 179                         list_add_tail(&bo->swap,
 180                                       &bo->glob->swap_lru[bo->priority]);
 181                         kref_get(&bo->list_kref);
 182                 }
 183         }
 184 }
 185 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 186
 187 static void ttm_bo_ref_bug(struct kref *list_kref)
 188 {
 189         BUG();
 190 }
 191
 192 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 193 {
 194         if (!list_empty(&bo->swap)) {
 195                 list_del_init(&bo->swap);
 196                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 197         }
 198         if (!list_empty(&bo->lru)) {
 199                 list_del_init(&bo->lru);
 200                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 201         }
 202
 203         /*
 204          * TODO: Add a driver hook to delete from
 205          * driver-specific LRU's here.
 206          */
 207 }
 208
 209 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 210 {
 211         spin_lock(&bo->glob->lru_lock);
 212         ttm_bo_del_from_lru(bo);
 213         spin_unlock(&bo->glob->lru_lock);
 214 }
 215 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 216
 217 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 218 {
 219         lockdep_assert_held(&bo->resv->lock.base);
 220
 221         ttm_bo_del_from_lru(bo);
 222         ttm_bo_add_to_lru(bo);
 223 }
 224 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 225
 226 /*
 227  * Call bo->mutex locked.
 228  */
 229 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 230 {
 231         struct ttm_bo_device *bdev = bo->bdev;
 232         struct ttm_bo_global *glob = bo->glob;
 233         int ret = 0;
 234         uint32_t page_flags = 0;
 235
 236         TTM_ASSERT_LOCKED(&bo->mutex);
 237         bo->ttm = NULL;
 238
 239         if (bdev->need_dma32)
 240                 page_flags |= TTM_PAGE_FLAG_DMA32;
 241
 242         switch (bo->type) {
 243         case ttm_bo_type_device:
 244                 if (zero_alloc)
 245                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 246         case ttm_bo_type_kernel:
 247                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 248                                                       page_flags, glob->dummy_read_page);
 249                 if (unlikely(bo->ttm == NULL))
 250                         ret = -ENOMEM;
 251                 break;
 252         case ttm_bo_type_sg:
 253                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 254                                                       page_flags | TTM_PAGE_FLAG_SG,
 255                                                       glob->dummy_read_page);
 256                 if (unlikely(bo->ttm == NULL)) {
 257                         ret = -ENOMEM;
 258                         break;
 259                 }
 260                 bo->ttm->sg = bo->sg;
 261                 break;
 262         default:
 263                 pr_err("Illegal buffer object type\n");
 264                 ret = -EINVAL;
 265                 break;
 266         }
 267
 268         return ret;
 269 }
 270
 271 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 272                                   struct ttm_mem_reg *mem,
 273                                   bool evict, bool interruptible,
 274                                   bool no_wait_gpu)
 275 {
 276         struct ttm_bo_device *bdev = bo->bdev;
 277         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 278         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 279         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 280         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 281         int ret = 0;
 282
 283         if (old_is_pci || new_is_pci ||
 284             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 285                 ret = ttm_mem_io_lock(old_man, true);
 286                 if (unlikely(ret != 0))
 287                         goto out_err;
 288                 ttm_bo_unmap_virtual_locked(bo);
 289                 ttm_mem_io_unlock(old_man);
 290         }
 291
 292         /*
 293          * Create and bind a ttm if required.
 294          */
 295
 296         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 297                 if (bo->ttm == NULL) {
 298                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 299                         ret = ttm_bo_add_ttm(bo, zero);
 300                         if (ret)
 301                                 goto out_err;
 302                 }
 303
 304                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 305                 if (ret)
 306                         goto out_err;
 307
 308                 if (mem->mem_type != TTM_PL_SYSTEM) {
 309                         ret = ttm_tt_bind(bo->ttm, mem);
 310                         if (ret)
 311                                 goto out_err;
 312                 }
 313
 314                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 315                         if (bdev->driver->move_notify)
 316                                 bdev->driver->move_notify(bo, evict, mem);
 317                         bo->mem = *mem;
 318                         mem->mm_node = NULL;
 319                         goto moved;
 320                 }
 321         }
 322
 323         if (bdev->driver->move_notify)
 324                 bdev->driver->move_notify(bo, evict, mem);
 325
 326         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 327             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 328                 ret = ttm_bo_move_ttm(bo, interruptible, no_wait_gpu, mem);
 329         else if (bdev->driver->move)
 330                 ret = bdev->driver->move(bo, evict, interruptible,
 331                                          no_wait_gpu, mem);
 332         else
 333                 ret = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, mem);
 334
 335         if (ret) {
 336                 if (bdev->driver->move_notify) {
 337                         struct ttm_mem_reg tmp_mem = *mem;
 338                         *mem = bo->mem;
 339                         bo->mem = tmp_mem;
 340                         bdev->driver->move_notify(bo, false, mem);
 341                         bo->mem = *mem;
 342                         *mem = tmp_mem;
 343                 }
 344
 345                 goto out_err;
 346         }
 347
 348 moved:
 349         if (bo->evicted) {
 350                 if (bdev->driver->invalidate_caches) {
 351                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 352                         if (ret)
 353                                 pr_err("Can not flush read caches\n");
 354                 }
 355                 bo->evicted = false;
 356         }
 357
 358         if (bo->mem.mm_node) {
 359                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 360                     bdev->man[bo->mem.mem_type].gpu_offset;
 361                 bo->cur_placement = bo->mem.placement;
 362         } else
 363                 bo->offset = 0;
 364
 365         return 0;
 366
 367 out_err:
 368         new_man = &bdev->man[bo->mem.mem_type];
 369         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 370                 ttm_tt_destroy(bo->ttm);
 371                 bo->ttm = NULL;
 372         }
 373
 374         return ret;
 375 }
 376
 377 /**
 378  * Call bo::reserved.
 379  * Will release GPU memory type usage on destruction.
 380  * This is the place to put in driver specific hooks to release
 381  * driver private resources.
 382  * Will release the bo::reserved lock.
 383  */
 384
 385 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 386 {
 387         if (bo->bdev->driver->move_notify)
 388                 bo->bdev->driver->move_notify(bo, false, NULL);
 389
 390         ttm_tt_destroy(bo->ttm);
 391         bo->ttm = NULL;
 392         ttm_bo_mem_put(bo, &bo->mem);
 393
 394         ww_mutex_unlock (&bo->resv->lock);
 395 }
 396
 397 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 398 {
 399         struct reservation_object_list *fobj;
 400         struct dma_fence *fence;
 401         int i;
 402
 403         fobj = reservation_object_get_list(bo->resv);
 404         fence = reservation_object_get_excl(bo->resv);
 405         if (fence && !fence->ops->signaled)
 406                 dma_fence_enable_sw_signaling(fence);
 407
 408         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 409                 fence = rcu_dereference_protected(fobj->shared[i],
 410                                         reservation_object_held(bo->resv));
 411
 412                 if (!fence->ops->signaled)
 413                         dma_fence_enable_sw_signaling(fence);
 414         }
 415 }
 416
 417 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 418 {
 419         struct ttm_bo_device *bdev = bo->bdev;
 420         struct ttm_bo_global *glob = bo->glob;
 421         int ret;
 422
 423         spin_lock(&glob->lru_lock);
 424         ret = __ttm_bo_reserve(bo, false, true, NULL);
 425
 426         if (!ret) {
 427                 if (!ttm_bo_wait(bo, false, true)) {
 428                         ttm_bo_del_from_lru(bo);
 429                         spin_unlock(&glob->lru_lock);
 430                         ttm_bo_cleanup_memtype_use(bo);
 431
 432                         return;
 433                 } else
 434                         ttm_bo_flush_all_fences(bo);
 435
 436                 /*
 437                  * Make NO_EVICT bos immediately available to
 438                  * shrinkers, now that they are queued for
 439                  * destruction.
 440                  */
 441                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 442                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 443                         ttm_bo_add_to_lru(bo);
 444                 }
 445
 446                 __ttm_bo_unreserve(bo);
 447         }
 448
 449         kref_get(&bo->list_kref);
 450         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 451         spin_unlock(&glob->lru_lock);
 452
 453         schedule_delayed_work(&bdev->wq,
 454                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 455 }
 456
 457 /**
 458  * function ttm_bo_cleanup_refs_and_unlock
 459  * If bo idle, remove from delayed- and lru lists, and unref.
 460  * If not idle, do nothing.
 461  *
 462  * Must be called with lru_lock and reservation held, this function
 463  * will drop both before returning.
 464  *
 465  * @interruptible         Any sleeps should occur interruptibly.
 466  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 467  */
 468
 469 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 470                                           bool interruptible,
 471                                           bool no_wait_gpu)
 472 {
 473         struct ttm_bo_global *glob = bo->glob;
 474         int ret;
 475
 476         ret = ttm_bo_wait(bo, false, true);
 477
 478         if (ret && !no_wait_gpu) {
 479                 long lret;
 480                 ww_mutex_unlock(&bo->resv->lock);
 481                 spin_unlock(&glob->lru_lock);
 482
 483                 lret = reservation_object_wait_timeout_rcu(bo->resv,
 484                                                            true,
 485                                                            interruptible,
 486                                                            30 * HZ);
 487
 488                 if (lret < 0)
 489                         return lret;
 490                 else if (lret == 0)
 491                         return -EBUSY;
 492
 493                 spin_lock(&glob->lru_lock);
 494                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 495
 496                 /*
 497                  * We raced, and lost, someone else holds the reservation now,
 498                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 499                  *
 500                  * Even if it's not the case, because we finished waiting any
 501                  * delayed destruction would succeed, so just return success
 502                  * here.
 503                  */
 504                 if (ret) {
 505                         spin_unlock(&glob->lru_lock);
 506                         return 0;
 507                 }
 508
 509                 /*
 510                  * remove sync_obj with ttm_bo_wait, the wait should be
 511                  * finished, and no new wait object should have been added.
 512                  */
 513                 ret = ttm_bo_wait(bo, false, true);
 514                 WARN_ON(ret);
 515         }
 516
 517         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 518                 __ttm_bo_unreserve(bo);
 519                 spin_unlock(&glob->lru_lock);
 520                 return ret;
 521         }
 522
 523         ttm_bo_del_from_lru(bo);
 524         list_del_init(&bo->ddestroy);
 525         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 526
 527         spin_unlock(&glob->lru_lock);
 528         ttm_bo_cleanup_memtype_use(bo);
 529
 530         return 0;
 531 }
 532
 533 /**
 534  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 535  * encountered buffers.
 536  */
 537
 538 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 539 {
 540         struct ttm_bo_global *glob = bdev->glob;
 541         struct ttm_buffer_object *entry = NULL;
 542         int ret = 0;
 543
 544         spin_lock(&glob->lru_lock);
 545         if (list_empty(&bdev->ddestroy))
 546                 goto out_unlock;
 547
 548         entry = list_first_entry(&bdev->ddestroy,
 549                 struct ttm_buffer_object, ddestroy);
 550         kref_get(&entry->list_kref);
 551
 552         for (;;) {
 553                 struct ttm_buffer_object *nentry = NULL;
 554
 555                 if (entry->ddestroy.next != &bdev->ddestroy) {
 556                         nentry = list_first_entry(&entry->ddestroy,
 557                                 struct ttm_buffer_object, ddestroy);
 558                         kref_get(&nentry->list_kref);
 559                 }
 560
 561                 ret = __ttm_bo_reserve(entry, false, true, NULL);
 562                 if (remove_all && ret) {
 563                         spin_unlock(&glob->lru_lock);
 564                         ret = __ttm_bo_reserve(entry, false, false, NULL);
 565                         spin_lock(&glob->lru_lock);
 566                 }
 567
 568                 if (!ret)
 569                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 570                                                              !remove_all);
 571                 else
 572                         spin_unlock(&glob->lru_lock);
 573
 574                 kref_put(&entry->list_kref, ttm_bo_release_list);
 575                 entry = nentry;
 576
 577                 if (ret || !entry)
 578                         goto out;
 579
 580                 spin_lock(&glob->lru_lock);
 581                 if (list_empty(&entry->ddestroy))
 582                         break;
 583         }
 584
 585 out_unlock:
 586         spin_unlock(&glob->lru_lock);
 587 out:
 588         if (entry)
 589                 kref_put(&entry->list_kref, ttm_bo_release_list);
 590         return ret;
 591 }
 592
 593 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 594 {
 595         struct ttm_bo_device *bdev =
 596             container_of(work, struct ttm_bo_device, wq.work);
 597
 598         if (ttm_bo_delayed_delete(bdev, false)) {
 599                 schedule_delayed_work(&bdev->wq,
 600                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 601         }
 602 }
 603
 604 static void ttm_bo_release(struct kref *kref)
 605 {
 606         struct ttm_buffer_object *bo =
 607             container_of(kref, struct ttm_buffer_object, kref);
 608         struct ttm_bo_device *bdev = bo->bdev;
 609         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 610
 611         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 612         ttm_mem_io_lock(man, false);
 613         ttm_mem_io_free_vm(bo);
 614         ttm_mem_io_unlock(man);
 615         ttm_bo_cleanup_refs_or_queue(bo);
 616         kref_put(&bo->list_kref, ttm_bo_release_list);
 617 }
 618
 619 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 620 {
 621         struct ttm_buffer_object *bo = *p_bo;
 622
 623         *p_bo = NULL;
 624         kref_put(&bo->kref, ttm_bo_release);
 625 }
 626 EXPORT_SYMBOL(ttm_bo_unref);
 627
 628 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 629 {
 630         return cancel_delayed_work_sync(&bdev->wq);
 631 }
 632 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 633
 634 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 635 {
 636         if (resched)
 637                 schedule_delayed_work(&bdev->wq,
 638                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 639 }
 640 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 641
 642 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 643                         bool no_wait_gpu)
 644 {
 645         struct ttm_bo_device *bdev = bo->bdev;
 646         struct ttm_mem_reg evict_mem;
 647         struct ttm_placement placement;
 648         int ret = 0;
 649
 650         lockdep_assert_held(&bo->resv->lock.base);
 651
 652         evict_mem = bo->mem;
 653         evict_mem.mm_node = NULL;
 654         evict_mem.bus.io_reserved_vm = false;
 655         evict_mem.bus.io_reserved_count = 0;
 656
 657         placement.num_placement = 0;
 658         placement.num_busy_placement = 0;
 659         bdev->driver->evict_flags(bo, &placement);
 660         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 661                                 no_wait_gpu);
 662         if (ret) {
 663                 if (ret != -ERESTARTSYS) {
 664                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 665                                bo);
 666                         ttm_bo_mem_space_debug(bo, &placement);
 667                 }
 668                 goto out;
 669         }
 670
 671         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 672                                      no_wait_gpu);
 673         if (unlikely(ret)) {
 674                 if (ret != -ERESTARTSYS)
 675                         pr_err("Buffer eviction failed\n");
 676                 ttm_bo_mem_put(bo, &evict_mem);
 677                 goto out;
 678         }
 679         bo->evicted = true;
 680 out:
 681         return ret;
 682 }
 683
 684 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 685                               const struct ttm_place *place)
 686 {
 687         /* Don't evict this BO if it's outside of the
 688          * requested placement range
 689          */
 690         if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 691             (place->lpfn && place->lpfn <= bo->mem.start))
 692                 return false;
 693
 694         return true;
 695 }
 696 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 697
 698 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 699                                 uint32_t mem_type,
 700                                 const struct ttm_place *place,
 701                                 bool interruptible,
 702                                 bool no_wait_gpu)
 703 {
 704         struct ttm_bo_global *glob = bdev->glob;
 705         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 706         struct ttm_buffer_object *bo;
 707         int ret = -EBUSY;
 708         unsigned i;
 709
 710         spin_lock(&glob->lru_lock);
 711         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 712                 list_for_each_entry(bo, &man->lru[i], lru) {
 713                         ret = __ttm_bo_reserve(bo, false, true, NULL);
 714                         if (ret)
 715                                 continue;
 716
 717                         if (place && !bdev->driver->eviction_valuable(bo,
 718                                                                       place)) {
 719                                 __ttm_bo_unreserve(bo);
 720                                 ret = -EBUSY;
 721                                 continue;
 722                         }
 723
 724                         break;
 725                 }
 726
 727                 if (!ret)
 728                         break;
 729         }
 730
 731         if (ret) {
 732                 spin_unlock(&glob->lru_lock);
 733                 return ret;
 734         }
 735
 736         kref_get(&bo->list_kref);
 737
 738         if (!list_empty(&bo->ddestroy)) {
 739                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 740                                                      no_wait_gpu);
 741                 kref_put(&bo->list_kref, ttm_bo_release_list);
 742                 return ret;
 743         }
 744
 745         ttm_bo_del_from_lru(bo);
 746         spin_unlock(&glob->lru_lock);
 747
 748         BUG_ON(ret != 0);
 749
 750         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 751         ttm_bo_unreserve(bo);
 752
 753         kref_put(&bo->list_kref, ttm_bo_release_list);
 754         return ret;
 755 }
 756
 757 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 758 {
 759         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 760
 761         if (mem->mm_node)
 762                 (*man->func->put_node)(man, mem);
 763 }
 764 EXPORT_SYMBOL(ttm_bo_mem_put);
 765
 766 /**
 767  * Add the last move fence to the BO and reserve a new shared slot.
 768  */
 769 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 770                                  struct ttm_mem_type_manager *man,
 771                                  struct ttm_mem_reg *mem)
 772 {
 773         struct dma_fence *fence;
 774         int ret;
 775
 776         spin_lock(&man->move_lock);
 777         fence = dma_fence_get(man->move);
 778         spin_unlock(&man->move_lock);
 779
 780         if (fence) {
 781                 reservation_object_add_shared_fence(bo->resv, fence);
 782
 783                 ret = reservation_object_reserve_shared(bo->resv);
 784                 if (unlikely(ret))
 785                         return ret;
 786
 787                 dma_fence_put(bo->moving);
 788                 bo->moving = fence;
 789         }
 790
 791         return 0;
 792 }
 793
 794 /**
 795  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 796  * space, or we've evicted everything and there isn't enough space.
 797  */
 798 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 799                                         uint32_t mem_type,
 800                                         const struct ttm_place *place,
 801                                         struct ttm_mem_reg *mem,
 802                                         bool interruptible,
 803                                         bool no_wait_gpu)
 804 {
 805         struct ttm_bo_device *bdev = bo->bdev;
 806         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 807         int ret;
 808
 809         do {
 810                 ret = (*man->func->get_node)(man, bo, place, mem);
 811                 if (unlikely(ret != 0))
 812                         return ret;
 813                 if (mem->mm_node)
 814                         break;
 815                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 816                                           interruptible, no_wait_gpu);
 817                 if (unlikely(ret != 0))
 818                         return ret;
 819         } while (1);
 820         mem->mem_type = mem_type;
 821         return ttm_bo_add_move_fence(bo, man, mem);
 822 }
 823
 824 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 825                                       uint32_t cur_placement,
 826                                       uint32_t proposed_placement)
 827 {
 828         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 829         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 830
 831         /**
 832          * Keep current caching if possible.
 833          */
 834
 835         if ((cur_placement & caching) != 0)
 836                 result |= (cur_placement & caching);
 837         else if ((man->default_caching & caching) != 0)
 838                 result |= man->default_caching;
 839         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 840                 result |= TTM_PL_FLAG_CACHED;
 841         else if ((TTM_PL_FLAG_WC & caching) != 0)
 842                 result |= TTM_PL_FLAG_WC;
 843         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 844                 result |= TTM_PL_FLAG_UNCACHED;
 845
 846         return result;
 847 }
 848
 849 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 850                                  uint32_t mem_type,
 851                                  const struct ttm_place *place,
 852                                  uint32_t *masked_placement)
 853 {
 854         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 855
 856         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 857                 return false;
 858
 859         if ((place->flags & man->available_caching) == 0)
 860                 return false;
 861
 862         cur_flags |= (place->flags & man->available_caching);
 863
 864         *masked_placement = cur_flags;
 865         return true;
 866 }
 867
 868 /**
 869  * Creates space for memory region @mem according to its type.
 870  *
 871  * This function first searches for free space in compatible memory types in
 872  * the priority order defined by the driver.  If free space isn't found, then
 873  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 874  * space.
 875  */
 876 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 877                         struct ttm_placement *placement,
 878                         struct ttm_mem_reg *mem,
 879                         bool interruptible,
 880                         bool no_wait_gpu)
 881 {
 882         struct ttm_bo_device *bdev = bo->bdev;
 883         struct ttm_mem_type_manager *man;
 884         uint32_t mem_type = TTM_PL_SYSTEM;
 885         uint32_t cur_flags = 0;
 886         bool type_found = false;
 887         bool type_ok = false;
 888         bool has_erestartsys = false;
 889         int i, ret;
 890
 891         ret = reservation_object_reserve_shared(bo->resv);
 892         if (unlikely(ret))
 893                 return ret;
 894
 895         mem->mm_node = NULL;
 896         for (i = 0; i < placement->num_placement; ++i) {
 897                 const struct ttm_place *place = &placement->placement[i];
 898
 899                 ret = ttm_mem_type_from_place(place, &mem_type);
 900                 if (ret)
 901                         return ret;
 902                 man = &bdev->man[mem_type];
 903                 if (!man->has_type || !man->use_type)
 904                         continue;
 905
 906                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 907                                                 &cur_flags);
 908
 909                 if (!type_ok)
 910                         continue;
 911
 912                 type_found = true;
 913                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 914                                                   cur_flags);
 915                 /*
 916                  * Use the access and other non-mapping-related flag bits from
 917                  * the memory placement flags to the current flags
 918                  */
 919                 ttm_flag_masked(&cur_flags, place->flags,
 920                                 ~TTM_PL_MASK_MEMTYPE);
 921
 922                 if (mem_type == TTM_PL_SYSTEM)
 923                         break;
 924
 925                 ret = (*man->func->get_node)(man, bo, place, mem);
 926                 if (unlikely(ret))
 927                         return ret;
 928
 929                 if (mem->mm_node) {
 930                         ret = ttm_bo_add_move_fence(bo, man, mem);
 931                         if (unlikely(ret)) {
 932                                 (*man->func->put_node)(man, mem);
 933                                 return ret;
 934                         }
 935                         break;
 936                 }
 937         }
 938
 939         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 940                 mem->mem_type = mem_type;
 941                 mem->placement = cur_flags;
 942                 return 0;
 943         }
 944
 945         for (i = 0; i < placement->num_busy_placement; ++i) {
 946                 const struct ttm_place *place = &placement->busy_placement[i];
 947
 948                 ret = ttm_mem_type_from_place(place, &mem_type);
 949                 if (ret)
 950                         return ret;
 951                 man = &bdev->man[mem_type];
 952                 if (!man->has_type || !man->use_type)
 953                         continue;
 954                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 955                         continue;
 956
 957                 type_found = true;
 958                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 959                                                   cur_flags);
 960                 /*
 961                  * Use the access and other non-mapping-related flag bits from
 962                  * the memory placement flags to the current flags
 963                  */
 964                 ttm_flag_masked(&cur_flags, place->flags,
 965                                 ~TTM_PL_MASK_MEMTYPE);
 966
 967                 if (mem_type == TTM_PL_SYSTEM) {
 968                         mem->mem_type = mem_type;
 969                         mem->placement = cur_flags;
 970                         mem->mm_node = NULL;
 971                         return 0;
 972                 }
 973
 974                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
 975                                                 interruptible, no_wait_gpu);
 976                 if (ret == 0 && mem->mm_node) {
 977                         mem->placement = cur_flags;
 978                         return 0;
 979                 }
 980                 if (ret == -ERESTARTSYS)
 981                         has_erestartsys = true;
 982         }
 983
 984         if (!type_found) {
 985                 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
 986                 return -EINVAL;
 987         }
 988
 989         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
 990 }
 991 EXPORT_SYMBOL(ttm_bo_mem_space);
 992
 993 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 994                         struct ttm_placement *placement,
 995                         bool interruptible,
 996                         bool no_wait_gpu)
 997 {
 998         int ret = 0;
 999         struct ttm_mem_reg mem;
1000
1001         lockdep_assert_held(&bo->resv->lock.base);
1002
1003         mem.num_pages = bo->num_pages;
1004         mem.size = mem.num_pages << PAGE_SHIFT;
1005         mem.page_alignment = bo->mem.page_alignment;
1006         mem.bus.io_reserved_vm = false;
1007         mem.bus.io_reserved_count = 0;
1008         /*
1009          * Determine where to move the buffer.
1010          */
1011         ret = ttm_bo_mem_space(bo, placement, &mem,
1012                                interruptible, no_wait_gpu);
1013         if (ret)
1014                 goto out_unlock;
1015         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1016                                      interruptible, no_wait_gpu);
1017 out_unlock:
1018         if (ret && mem.mm_node)
1019                 ttm_bo_mem_put(bo, &mem);
1020         return ret;
1021 }
1022
1023 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1024                        struct ttm_mem_reg *mem,
1025                        uint32_t *new_flags)
1026 {
1027         int i;
1028
1029         for (i = 0; i < placement->num_placement; i++) {
1030                 const struct ttm_place *heap = &placement->placement[i];
1031                 if (mem->mm_node &&
1032                     (mem->start < heap->fpfn ||
1033                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1034                         continue;
1035
1036                 *new_flags = heap->flags;
1037                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1038                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1039                         return true;
1040         }
1041
1042         for (i = 0; i < placement->num_busy_placement; i++) {
1043                 const struct ttm_place *heap = &placement->busy_placement[i];
1044                 if (mem->mm_node &&
1045                     (mem->start < heap->fpfn ||
1046                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1047                         continue;
1048
1049                 *new_flags = heap->flags;
1050                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1051                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1052                         return true;
1053         }
1054
1055         return false;
1056 }
1057 EXPORT_SYMBOL(ttm_bo_mem_compat);
1058
1059 int ttm_bo_validate(struct ttm_buffer_object *bo,
1060                         struct ttm_placement *placement,
1061                         bool interruptible,
1062                         bool no_wait_gpu)
1063 {
1064         int ret;
1065         uint32_t new_flags;
1066
1067         lockdep_assert_held(&bo->resv->lock.base);
1068         /*
1069          * Check whether we need to move buffer.
1070          */
1071         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1072                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1073                                          no_wait_gpu);
1074                 if (ret)
1075                         return ret;
1076         } else {
1077                 /*
1078                  * Use the access and other non-mapping-related flag bits from
1079                  * the compatible memory placement flags to the active flags
1080                  */
1081                 ttm_flag_masked(&bo->mem.placement, new_flags,
1082                                 ~TTM_PL_MASK_MEMTYPE);
1083         }
1084         /*
1085          * We might need to add a TTM.
1086          */
1087         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1088                 ret = ttm_bo_add_ttm(bo, true);
1089                 if (ret)
1090                         return ret;
1091         }
1092         return 0;
1093 }
1094 EXPORT_SYMBOL(ttm_bo_validate);
1095
1096 int ttm_bo_init(struct ttm_bo_device *bdev,
1097                 struct ttm_buffer_object *bo,
1098                 unsigned long size,
1099                 enum ttm_bo_type type,
1100                 struct ttm_placement *placement,
1101                 uint32_t page_alignment,
1102                 bool interruptible,
1103                 struct file *persistent_swap_storage,
1104                 size_t acc_size,
1105                 struct sg_table *sg,
1106                 struct reservation_object *resv,
1107                 void (*destroy) (struct ttm_buffer_object *))
1108 {
1109         int ret = 0;
1110         unsigned long num_pages;
1111         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1112         bool locked;
1113
1114         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1115         if (ret) {
1116                 pr_err("Out of kernel memory\n");
1117                 if (destroy)
1118                         (*destroy)(bo);
1119                 else
1120                         kfree(bo);
1121                 return -ENOMEM;
1122         }
1123
1124         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1125         if (num_pages == 0) {
1126                 pr_err("Illegal buffer object size\n");
1127                 if (destroy)
1128                         (*destroy)(bo);
1129                 else
1130                         kfree(bo);
1131                 ttm_mem_global_free(mem_glob, acc_size);
1132                 return -EINVAL;
1133         }
1134         bo->destroy = destroy;
1135
1136         kref_init(&bo->kref);
1137         kref_init(&bo->list_kref);
1138         atomic_set(&bo->cpu_writers, 0);
1139         INIT_LIST_HEAD(&bo->lru);
1140         INIT_LIST_HEAD(&bo->ddestroy);
1141         INIT_LIST_HEAD(&bo->swap);
1142         INIT_LIST_HEAD(&bo->io_reserve_lru);
1143         mutex_init(&bo->wu_mutex);
1144         bo->bdev = bdev;
1145         bo->glob = bdev->glob;
1146         bo->type = type;
1147         bo->num_pages = num_pages;
1148         bo->mem.size = num_pages << PAGE_SHIFT;
1149         bo->mem.mem_type = TTM_PL_SYSTEM;
1150         bo->mem.num_pages = bo->num_pages;
1151         bo->mem.mm_node = NULL;
1152         bo->mem.page_alignment = page_alignment;
1153         bo->mem.bus.io_reserved_vm = false;
1154         bo->mem.bus.io_reserved_count = 0;
1155         bo->moving = NULL;
1156         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1157         bo->persistent_swap_storage = persistent_swap_storage;
1158         bo->acc_size = acc_size;
1159         bo->sg = sg;
1160         if (resv) {
1161                 bo->resv = resv;
1162                 lockdep_assert_held(&bo->resv->lock.base);
1163         } else {
1164                 bo->resv = &bo->ttm_resv;
1165                 reservation_object_init(&bo->ttm_resv);
1166         }
1167         atomic_inc(&bo->glob->bo_count);
1168         drm_vma_node_reset(&bo->vma_node);
1169         bo->priority = 0;
1170
1171         /*
1172          * For ttm_bo_type_device buffers, allocate
1173          * address space from the device.
1174          */
1175         if (bo->type == ttm_bo_type_device ||
1176             bo->type == ttm_bo_type_sg)
1177                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1178                                          bo->mem.num_pages);
1179
1180         /* passed reservation objects should already be locked,
1181          * since otherwise lockdep will be angered in radeon.
1182          */
1183         if (!resv) {
1184                 locked = ww_mutex_trylock(&bo->resv->lock);
1185                 WARN_ON(!locked);
1186         }
1187
1188         if (likely(!ret))
1189                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1190
1191         if (!resv) {
1192                 ttm_bo_unreserve(bo);
1193
1194         } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1195                 spin_lock(&bo->glob->lru_lock);
1196                 ttm_bo_add_to_lru(bo);
1197                 spin_unlock(&bo->glob->lru_lock);
1198         }
1199
1200         if (unlikely(ret))
1201                 ttm_bo_unref(&bo);
1202
1203         return ret;
1204 }
1205 EXPORT_SYMBOL(ttm_bo_init);
1206
1207 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1208                        unsigned long bo_size,
1209                        unsigned struct_size)
1210 {
1211         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1212         size_t size = 0;
1213
1214         size += ttm_round_pot(struct_size);
1215         size += ttm_round_pot(npages * sizeof(void *));
1216         size += ttm_round_pot(sizeof(struct ttm_tt));
1217         return size;
1218 }
1219 EXPORT_SYMBOL(ttm_bo_acc_size);
1220
1221 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1222                            unsigned long bo_size,
1223                            unsigned struct_size)
1224 {
1225         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1226         size_t size = 0;
1227
1228         size += ttm_round_pot(struct_size);
1229         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1230         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1231         return size;
1232 }
1233 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1234
1235 int ttm_bo_create(struct ttm_bo_device *bdev,
1236                         unsigned long size,
1237                         enum ttm_bo_type type,
1238                         struct ttm_placement *placement,
1239                         uint32_t page_alignment,
1240                         bool interruptible,
1241                         struct file *persistent_swap_storage,
1242                         struct ttm_buffer_object **p_bo)
1243 {
1244         struct ttm_buffer_object *bo;
1245         size_t acc_size;
1246         int ret;
1247
1248         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1249         if (unlikely(bo == NULL))
1250                 return -ENOMEM;
1251
1252         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1253         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1254                           interruptible, persistent_swap_storage, acc_size,
1255                           NULL, NULL, NULL);
1256         if (likely(ret == 0))
1257                 *p_bo = bo;
1258
1259         return ret;
1260 }
1261 EXPORT_SYMBOL(ttm_bo_create);
1262
1263 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1264                                    unsigned mem_type)
1265 {
1266         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1267         struct ttm_bo_global *glob = bdev->glob;
1268         struct dma_fence *fence;
1269         int ret;
1270         unsigned i;
1271
1272         /*
1273          * Can't use standard list traversal since we're unlocking.
1274          */
1275
1276         spin_lock(&glob->lru_lock);
1277         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1278                 while (!list_empty(&man->lru[i])) {
1279                         spin_unlock(&glob->lru_lock);
1280                         ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1281                         if (ret)
1282                                 return ret;
1283                         spin_lock(&glob->lru_lock);
1284                 }
1285         }
1286         spin_unlock(&glob->lru_lock);
1287
1288         spin_lock(&man->move_lock);
1289         fence = dma_fence_get(man->move);
1290         spin_unlock(&man->move_lock);
1291
1292         if (fence) {
1293                 ret = dma_fence_wait(fence, false);
1294                 dma_fence_put(fence);
1295                 if (ret)
1296                         return ret;
1297         }
1298
1299         return 0;
1300 }
1301
1302 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1303 {
1304         struct ttm_mem_type_manager *man;
1305         int ret = -EINVAL;
1306
1307         if (mem_type >= TTM_NUM_MEM_TYPES) {
1308                 pr_err("Illegal memory type %d\n", mem_type);
1309                 return ret;
1310         }
1311         man = &bdev->man[mem_type];
1312
1313         if (!man->has_type) {
1314                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1315                        mem_type);
1316                 return ret;
1317         }
1318         dma_fence_put(man->move);
1319
1320         man->use_type = false;
1321         man->has_type = false;
1322
1323         ret = 0;
1324         if (mem_type > 0) {
1325                 ret = ttm_bo_force_list_clean(bdev, mem_type);
1326                 if (ret) {
1327                         pr_err("Cleanup eviction failed\n");
1328                         return ret;
1329                 }
1330
1331                 ret = (*man->func->takedown)(man);
1332         }
1333
1334         return ret;
1335 }
1336 EXPORT_SYMBOL(ttm_bo_clean_mm);
1337
1338 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1339 {
1340         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1341
1342         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1343                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1344                 return -EINVAL;
1345         }
1346
1347         if (!man->has_type) {
1348                 pr_err("Memory type %u has not been initialized\n", mem_type);
1349                 return 0;
1350         }
1351
1352         return ttm_bo_force_list_clean(bdev, mem_type);
1353 }
1354 EXPORT_SYMBOL(ttm_bo_evict_mm);
1355
1356 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1357                         unsigned long p_size)
1358 {
1359         int ret = -EINVAL;
1360         struct ttm_mem_type_manager *man;
1361         unsigned i;
1362
1363         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1364         man = &bdev->man[type];
1365         BUG_ON(man->has_type);
1366         man->io_reserve_fastpath = true;
1367         man->use_io_reserve_lru = false;
1368         mutex_init(&man->io_reserve_mutex);
1369         spin_lock_init(&man->move_lock);
1370         INIT_LIST_HEAD(&man->io_reserve_lru);
1371
1372         ret = bdev->driver->init_mem_type(bdev, type, man);
1373         if (ret)
1374                 return ret;
1375         man->bdev = bdev;
1376
1377         ret = 0;
1378         if (type != TTM_PL_SYSTEM) {
1379                 ret = (*man->func->init)(man, p_size);
1380                 if (ret)
1381                         return ret;
1382         }
1383         man->has_type = true;
1384         man->use_type = true;
1385         man->size = p_size;
1386
1387         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1388                 INIT_LIST_HEAD(&man->lru[i]);
1389         man->move = NULL;
1390
1391         return 0;
1392 }
1393 EXPORT_SYMBOL(ttm_bo_init_mm);
1394
1395 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1396 {
1397         struct ttm_bo_global *glob =
1398                 container_of(kobj, struct ttm_bo_global, kobj);
1399
1400         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1401         __free_page(glob->dummy_read_page);
1402         kfree(glob);
1403 }
1404
1405 void ttm_bo_global_release(struct drm_global_reference *ref)
1406 {
1407         struct ttm_bo_global *glob = ref->object;
1408
1409         kobject_del(&glob->kobj);
1410         kobject_put(&glob->kobj);
1411 }
1412 EXPORT_SYMBOL(ttm_bo_global_release);
1413
1414 int ttm_bo_global_init(struct drm_global_reference *ref)
1415 {
1416         struct ttm_bo_global_ref *bo_ref =
1417                 container_of(ref, struct ttm_bo_global_ref, ref);
1418         struct ttm_bo_global *glob = ref->object;
1419         int ret;
1420         unsigned i;
1421
1422         mutex_init(&glob->device_list_mutex);
1423         spin_lock_init(&glob->lru_lock);
1424         glob->mem_glob = bo_ref->mem_glob;
1425         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1426
1427         if (unlikely(glob->dummy_read_page == NULL)) {
1428                 ret = -ENOMEM;
1429                 goto out_no_drp;
1430         }
1431
1432         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1433                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1434         INIT_LIST_HEAD(&glob->device_list);
1435
1436         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1437         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1438         if (unlikely(ret != 0)) {
1439                 pr_err("Could not register buffer object swapout\n");
1440                 goto out_no_shrink;
1441         }
1442
1443         atomic_set(&glob->bo_count, 0);
1444
1445         ret = kobject_init_and_add(
1446                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1447         if (unlikely(ret != 0))
1448                 kobject_put(&glob->kobj);
1449         return ret;
1450 out_no_shrink:
1451         __free_page(glob->dummy_read_page);
1452 out_no_drp:
1453         kfree(glob);
1454         return ret;
1455 }
1456 EXPORT_SYMBOL(ttm_bo_global_init);
1457
1458
1459 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1460 {
1461         int ret = 0;
1462         unsigned i = TTM_NUM_MEM_TYPES;
1463         struct ttm_mem_type_manager *man;
1464         struct ttm_bo_global *glob = bdev->glob;
1465
1466         while (i--) {
1467                 man = &bdev->man[i];
1468                 if (man->has_type) {
1469                         man->use_type = false;
1470                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1471                                 ret = -EBUSY;
1472                                 pr_err("DRM memory manager type %d is not clean\n",
1473                                        i);
1474                         }
1475                         man->has_type = false;
1476                 }
1477         }
1478
1479         mutex_lock(&glob->device_list_mutex);
1480         list_del(&bdev->device_list);
1481         mutex_unlock(&glob->device_list_mutex);
1482
1483         cancel_delayed_work_sync(&bdev->wq);
1484
1485         while (ttm_bo_delayed_delete(bdev, true))
1486                 ;
1487
1488         spin_lock(&glob->lru_lock);
1489         if (list_empty(&bdev->ddestroy))
1490                 TTM_DEBUG("Delayed destroy list was clean\n");
1491
1492         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1493                 if (list_empty(&bdev->man[0].lru[0]))
1494                         TTM_DEBUG("Swap list %d was clean\n", i);
1495         spin_unlock(&glob->lru_lock);
1496
1497         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1498
1499         return ret;
1500 }
1501 EXPORT_SYMBOL(ttm_bo_device_release);
1502
1503 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1504                        struct ttm_bo_global *glob,
1505                        struct ttm_bo_driver *driver,
1506                        struct address_space *mapping,
1507                        uint64_t file_page_offset,
1508                        bool need_dma32)
1509 {
1510         int ret = -EINVAL;
1511
1512         bdev->driver = driver;
1513
1514         memset(bdev->man, 0, sizeof(bdev->man));
1515
1516         /*
1517          * Initialize the system memory buffer type.
1518          * Other types need to be driver / IOCTL initialized.
1519          */
1520         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1521         if (unlikely(ret != 0))
1522                 goto out_no_sys;
1523
1524         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1525                                     0x10000000);
1526         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1527         INIT_LIST_HEAD(&bdev->ddestroy);
1528         bdev->dev_mapping = mapping;
1529         bdev->glob = glob;
1530         bdev->need_dma32 = need_dma32;
1531         mutex_lock(&glob->device_list_mutex);
1532         list_add_tail(&bdev->device_list, &glob->device_list);
1533         mutex_unlock(&glob->device_list_mutex);
1534
1535         return 0;
1536 out_no_sys:
1537         return ret;
1538 }
1539 EXPORT_SYMBOL(ttm_bo_device_init);
1540
1541 /*
1542  * buffer object vm functions.
1543  */
1544
1545 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1546 {
1547         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1548
1549         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1550                 if (mem->mem_type == TTM_PL_SYSTEM)
1551                         return false;
1552
1553                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1554                         return false;
1555
1556                 if (mem->placement & TTM_PL_FLAG_CACHED)
1557                         return false;
1558         }
1559         return true;
1560 }
1561
1562 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1563 {
1564         struct ttm_bo_device *bdev = bo->bdev;
1565
1566         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1567         ttm_mem_io_free_vm(bo);
1568 }
1569
1570 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1571 {
1572         struct ttm_bo_device *bdev = bo->bdev;
1573         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1574
1575         ttm_mem_io_lock(man, false);
1576         ttm_bo_unmap_virtual_locked(bo);
1577         ttm_mem_io_unlock(man);
1578 }
1579
1580
1581 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1582
1583 int ttm_bo_wait(struct ttm_buffer_object *bo,
1584                 bool interruptible, bool no_wait)
1585 {
1586         long timeout = 15 * HZ;
1587
1588         if (no_wait) {
1589                 if (reservation_object_test_signaled_rcu(bo->resv, true))
1590                         return 0;
1591                 else
1592                         return -EBUSY;
1593         }
1594
1595         timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1596                                                       interruptible, timeout);
1597         if (timeout < 0)
1598                 return timeout;
1599
1600         if (timeout == 0)
1601                 return -EBUSY;
1602
1603         reservation_object_add_excl_fence(bo->resv, NULL);
1604         return 0;
1605 }
1606 EXPORT_SYMBOL(ttm_bo_wait);
1607
1608 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1609 {
1610         int ret = 0;
1611
1612         /*
1613          * Using ttm_bo_reserve makes sure the lru lists are updated.
1614          */
1615
1616         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1617         if (unlikely(ret != 0))
1618                 return ret;
1619         ret = ttm_bo_wait(bo, true, no_wait);
1620         if (likely(ret == 0))
1621                 atomic_inc(&bo->cpu_writers);
1622         ttm_bo_unreserve(bo);
1623         return ret;
1624 }
1625 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1626
1627 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1628 {
1629         atomic_dec(&bo->cpu_writers);
1630 }
1631 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1632
1633 /**
1634  * A buffer object shrink method that tries to swap out the first
1635  * buffer object on the bo_global::swap_lru list.
1636  */
1637
1638 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1639 {
1640         struct ttm_bo_global *glob =
1641             container_of(shrink, struct ttm_bo_global, shrink);
1642         struct ttm_buffer_object *bo;
1643         int ret = -EBUSY;
1644         unsigned i;
1645
1646         spin_lock(&glob->lru_lock);
1647         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1648                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1649                         ret = __ttm_bo_reserve(bo, false, true, NULL);
1650                         if (!ret)
1651                                 break;
1652                 }
1653                 if (!ret)
1654                         break;
1655         }
1656
1657         if (ret) {
1658                 spin_unlock(&glob->lru_lock);
1659                 return ret;
1660         }
1661
1662         kref_get(&bo->list_kref);
1663
1664         if (!list_empty(&bo->ddestroy)) {
1665                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1666                 kref_put(&bo->list_kref, ttm_bo_release_list);
1667                 return ret;
1668         }
1669
1670         ttm_bo_del_from_lru(bo);
1671         spin_unlock(&glob->lru_lock);
1672
1673         /**
1674          * Move to system cached
1675          */
1676
1677         if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1678             bo->ttm->caching_state != tt_cached) {
1679                 struct ttm_mem_reg evict_mem;
1680
1681                 evict_mem = bo->mem;
1682                 evict_mem.mm_node = NULL;
1683                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1684                 evict_mem.mem_type = TTM_PL_SYSTEM;
1685
1686                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1687                                              false, false);
1688                 if (unlikely(ret != 0))
1689                         goto out;
1690         }
1691
1692         /**
1693          * Make sure BO is idle.
1694          */
1695
1696         ret = ttm_bo_wait(bo, false, false);
1697         if (unlikely(ret != 0))
1698                 goto out;
1699
1700         ttm_bo_unmap_virtual(bo);
1701
1702         /**
1703          * Swap out. Buffer will be swapped in again as soon as
1704          * anyone tries to access a ttm page.
1705          */
1706
1707         if (bo->bdev->driver->swap_notify)
1708                 bo->bdev->driver->swap_notify(bo);
1709
1710         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1711 out:
1712
1713         /**
1714          *
1715          * Unreserve without putting on LRU to avoid swapping out an
1716          * already swapped buffer.
1717          */
1718
1719         __ttm_bo_unreserve(bo);
1720         kref_put(&bo->list_kref, ttm_bo_release_list);
1721         return ret;
1722 }
1723
1724 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1725 {
1726         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1727                 ;
1728 }
1729 EXPORT_SYMBOL(ttm_bo_swapout_all);
1730
1731 /**
1732  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1733  * unreserved
1734  *
1735  * @bo: Pointer to buffer
1736  */
1737 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1738 {
1739         int ret;
1740
1741         /*
1742          * In the absense of a wait_unlocked API,
1743          * Use the bo::wu_mutex to avoid triggering livelocks due to
1744          * concurrent use of this function. Note that this use of
1745          * bo::wu_mutex can go away if we change locking order to
1746          * mmap_sem -> bo::reserve.
1747          */
1748         ret = mutex_lock_interruptible(&bo->wu_mutex);
1749         if (unlikely(ret != 0))
1750                 return -ERESTARTSYS;
1751         if (!ww_mutex_is_locked(&bo->resv->lock))
1752                 goto out_unlock;
1753         ret = __ttm_bo_reserve(bo, true, false, NULL);
1754         if (unlikely(ret != 0))
1755                 goto out_unlock;
1756         __ttm_bo_unreserve(bo);
1757
1758 out_unlock:
1759         mutex_unlock(&bo->wu_mutex);
1760         return ret;
1761 }