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         struct drm_printer p = drm_debug_printer(TTM_PFX);
  74
  75         pr_err("    has_type: %d\n", man->has_type);
  76         pr_err("    use_type: %d\n", man->use_type);
  77         pr_err("    flags: 0x%08X\n", man->flags);
  78         pr_err("    gpu_offset: 0x%08llX\n", man->gpu_offset);
  79         pr_err("    size: %llu\n", man->size);
  80         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  81         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  82         if (mem_type != TTM_PL_SYSTEM)
  83                 (*man->func->debug)(man, &p);
  84 }
  85
  86 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  87                                         struct ttm_placement *placement)
  88 {
  89         int i, ret, mem_type;
  90
  91         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  92                bo, bo->mem.num_pages, bo->mem.size >> 10,
  93                bo->mem.size >> 20);
  94         for (i = 0; i < placement->num_placement; i++) {
  95                 ret = ttm_mem_type_from_place(&placement->placement[i],
  96                                                 &mem_type);
  97                 if (ret)
  98                         return;
  99                 pr_err("  placement[%d]=0x%08X (%d)\n",
 100                        i, placement->placement[i].flags, mem_type);
 101                 ttm_mem_type_debug(bo->bdev, mem_type);
 102         }
 103 }
 104
 105 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 106                                   struct attribute *attr,
 107                                   char *buffer)
 108 {
 109         struct ttm_bo_global *glob =
 110                 container_of(kobj, struct ttm_bo_global, kobj);
 111
 112         return snprintf(buffer, PAGE_SIZE, "%d\n",
 113                                 atomic_read(&glob->bo_count));
 114 }
 115
 116 static struct attribute *ttm_bo_global_attrs[] = {
 117         &ttm_bo_count,
 118         NULL
 119 };
 120
 121 static const struct sysfs_ops ttm_bo_global_ops = {
 122         .show = &ttm_bo_global_show
 123 };
 124
 125 static struct kobj_type ttm_bo_glob_kobj_type  = {
 126         .release = &ttm_bo_global_kobj_release,
 127         .sysfs_ops = &ttm_bo_global_ops,
 128         .default_attrs = ttm_bo_global_attrs
 129 };
 130
 131
 132 static inline uint32_t ttm_bo_type_flags(unsigned type)
 133 {
 134         return 1 << (type);
 135 }
 136
 137 static void ttm_bo_release_list(struct kref *list_kref)
 138 {
 139         struct ttm_buffer_object *bo =
 140             container_of(list_kref, struct ttm_buffer_object, list_kref);
 141         struct ttm_bo_device *bdev = bo->bdev;
 142         size_t acc_size = bo->acc_size;
 143
 144         BUG_ON(kref_read(&bo->list_kref));
 145         BUG_ON(kref_read(&bo->kref));
 146         BUG_ON(atomic_read(&bo->cpu_writers));
 147         BUG_ON(bo->mem.mm_node != NULL);
 148         BUG_ON(!list_empty(&bo->lru));
 149         BUG_ON(!list_empty(&bo->ddestroy));
 150         ttm_tt_destroy(bo->ttm);
 151         atomic_dec(&bo->glob->bo_count);
 152         dma_fence_put(bo->moving);
 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 &
 179                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED))) {
 180                         list_add_tail(&bo->swap,
 181                                       &bo->glob->swap_lru[bo->priority]);
 182                         kref_get(&bo->list_kref);
 183                 }
 184         }
 185 }
 186 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 187
 188 static void ttm_bo_ref_bug(struct kref *list_kref)
 189 {
 190         BUG();
 191 }
 192
 193 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 194 {
 195         if (!list_empty(&bo->swap)) {
 196                 list_del_init(&bo->swap);
 197                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 198         }
 199         if (!list_empty(&bo->lru)) {
 200                 list_del_init(&bo->lru);
 201                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 202         }
 203
 204         /*
 205          * TODO: Add a driver hook to delete from
 206          * driver-specific LRU's here.
 207          */
 208 }
 209
 210 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 211 {
 212         spin_lock(&bo->glob->lru_lock);
 213         ttm_bo_del_from_lru(bo);
 214         spin_unlock(&bo->glob->lru_lock);
 215 }
 216 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 217
 218 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 219 {
 220         lockdep_assert_held(&bo->resv->lock.base);
 221
 222         ttm_bo_del_from_lru(bo);
 223         ttm_bo_add_to_lru(bo);
 224 }
 225 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 226
 227 /*
 228  * Call bo->mutex locked.
 229  */
 230 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 231 {
 232         struct ttm_bo_device *bdev = bo->bdev;
 233         struct ttm_bo_global *glob = bo->glob;
 234         int ret = 0;
 235         uint32_t page_flags = 0;
 236
 237         TTM_ASSERT_LOCKED(&bo->mutex);
 238         bo->ttm = NULL;
 239
 240         if (bdev->need_dma32)
 241                 page_flags |= TTM_PAGE_FLAG_DMA32;
 242
 243         switch (bo->type) {
 244         case ttm_bo_type_device:
 245                 if (zero_alloc)
 246                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 247         case ttm_bo_type_kernel:
 248                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 249                                                       page_flags, glob->dummy_read_page);
 250                 if (unlikely(bo->ttm == NULL))
 251                         ret = -ENOMEM;
 252                 break;
 253         case ttm_bo_type_sg:
 254                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 255                                                       page_flags | TTM_PAGE_FLAG_SG,
 256                                                       glob->dummy_read_page);
 257                 if (unlikely(bo->ttm == NULL)) {
 258                         ret = -ENOMEM;
 259                         break;
 260                 }
 261                 bo->ttm->sg = bo->sg;
 262                 break;
 263         default:
 264                 pr_err("Illegal buffer object type\n");
 265                 ret = -EINVAL;
 266                 break;
 267         }
 268
 269         return ret;
 270 }
 271
 272 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 273                                   struct ttm_mem_reg *mem,
 274                                   bool evict, bool interruptible,
 275                                   bool no_wait_gpu)
 276 {
 277         struct ttm_bo_device *bdev = bo->bdev;
 278         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 279         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 280         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 281         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 282         int ret = 0;
 283
 284         if (old_is_pci || new_is_pci ||
 285             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 286                 ret = ttm_mem_io_lock(old_man, true);
 287                 if (unlikely(ret != 0))
 288                         goto out_err;
 289                 ttm_bo_unmap_virtual_locked(bo);
 290                 ttm_mem_io_unlock(old_man);
 291         }
 292
 293         /*
 294          * Create and bind a ttm if required.
 295          */
 296
 297         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 298                 if (bo->ttm == NULL) {
 299                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 300                         ret = ttm_bo_add_ttm(bo, zero);
 301                         if (ret)
 302                                 goto out_err;
 303                 }
 304
 305                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 306                 if (ret)
 307                         goto out_err;
 308
 309                 if (mem->mem_type != TTM_PL_SYSTEM) {
 310                         ret = ttm_tt_bind(bo->ttm, mem);
 311                         if (ret)
 312                                 goto out_err;
 313                 }
 314
 315                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 316                         if (bdev->driver->move_notify)
 317                                 bdev->driver->move_notify(bo, evict, mem);
 318                         bo->mem = *mem;
 319                         mem->mm_node = NULL;
 320                         goto moved;
 321                 }
 322         }
 323
 324         if (bdev->driver->move_notify)
 325                 bdev->driver->move_notify(bo, evict, mem);
 326
 327         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 328             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 329                 ret = ttm_bo_move_ttm(bo, interruptible, no_wait_gpu, mem);
 330         else if (bdev->driver->move)
 331                 ret = bdev->driver->move(bo, evict, interruptible,
 332                                          no_wait_gpu, mem);
 333         else
 334                 ret = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, mem);
 335
 336         if (ret) {
 337                 if (bdev->driver->move_notify) {
 338                         struct ttm_mem_reg tmp_mem = *mem;
 339                         *mem = bo->mem;
 340                         bo->mem = tmp_mem;
 341                         bdev->driver->move_notify(bo, false, mem);
 342                         bo->mem = *mem;
 343                         *mem = tmp_mem;
 344                 }
 345
 346                 goto out_err;
 347         }
 348
 349 moved:
 350         if (bo->evicted) {
 351                 if (bdev->driver->invalidate_caches) {
 352                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 353                         if (ret)
 354                                 pr_err("Can not flush read caches\n");
 355                 }
 356                 bo->evicted = false;
 357         }
 358
 359         if (bo->mem.mm_node) {
 360                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 361                     bdev->man[bo->mem.mem_type].gpu_offset;
 362                 bo->cur_placement = bo->mem.placement;
 363         } else
 364                 bo->offset = 0;
 365
 366         return 0;
 367
 368 out_err:
 369         new_man = &bdev->man[bo->mem.mem_type];
 370         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 371                 ttm_tt_destroy(bo->ttm);
 372                 bo->ttm = NULL;
 373         }
 374
 375         return ret;
 376 }
 377
 378 /**
 379  * Call bo::reserved.
 380  * Will release GPU memory type usage on destruction.
 381  * This is the place to put in driver specific hooks to release
 382  * driver private resources.
 383  * Will release the bo::reserved lock.
 384  */
 385
 386 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 387 {
 388         if (bo->bdev->driver->move_notify)
 389                 bo->bdev->driver->move_notify(bo, false, NULL);
 390
 391         ttm_tt_destroy(bo->ttm);
 392         bo->ttm = NULL;
 393         ttm_bo_mem_put(bo, &bo->mem);
 394
 395         ww_mutex_unlock (&bo->resv->lock);
 396 }
 397
 398 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 399 {
 400         int r;
 401
 402         if (bo->resv == &bo->ttm_resv)
 403                 return 0;
 404
 405         BUG_ON(!reservation_object_trylock(&bo->ttm_resv));
 406
 407         r = reservation_object_copy_fences(&bo->ttm_resv, bo->resv);
 408         if (r)
 409                 reservation_object_unlock(&bo->ttm_resv);
 410
 411         return r;
 412 }
 413
 414 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 415 {
 416         struct reservation_object_list *fobj;
 417         struct dma_fence *fence;
 418         int i;
 419
 420         fobj = reservation_object_get_list(&bo->ttm_resv);
 421         fence = reservation_object_get_excl(&bo->ttm_resv);
 422         if (fence && !fence->ops->signaled)
 423                 dma_fence_enable_sw_signaling(fence);
 424
 425         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 426                 fence = rcu_dereference_protected(fobj->shared[i],
 427                                         reservation_object_held(bo->resv));
 428
 429                 if (!fence->ops->signaled)
 430                         dma_fence_enable_sw_signaling(fence);
 431         }
 432 }
 433
 434 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 435 {
 436         struct ttm_bo_device *bdev = bo->bdev;
 437         struct ttm_bo_global *glob = bo->glob;
 438         int ret;
 439
 440         ret = ttm_bo_individualize_resv(bo);
 441         if (ret) {
 442                 /* Last resort, if we fail to allocate memory for the
 443                  * fences block for the BO to become idle
 444                  */
 445                 reservation_object_wait_timeout_rcu(bo->resv, true, false,
 446                                                     30 * HZ);
 447                 spin_lock(&glob->lru_lock);
 448                 goto error;
 449         }
 450
 451         spin_lock(&glob->lru_lock);
 452         ret = __ttm_bo_reserve(bo, false, true, NULL);
 453         if (!ret) {
 454                 if (reservation_object_test_signaled_rcu(&bo->ttm_resv, true)) {
 455                         ttm_bo_del_from_lru(bo);
 456                         spin_unlock(&glob->lru_lock);
 457                         if (bo->resv != &bo->ttm_resv)
 458                                 reservation_object_unlock(&bo->ttm_resv);
 459
 460                         ttm_bo_cleanup_memtype_use(bo);
 461                         return;
 462                 }
 463
 464                 ttm_bo_flush_all_fences(bo);
 465
 466                 /*
 467                  * Make NO_EVICT bos immediately available to
 468                  * shrinkers, now that they are queued for
 469                  * destruction.
 470                  */
 471                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 472                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 473                         ttm_bo_add_to_lru(bo);
 474                 }
 475
 476                 __ttm_bo_unreserve(bo);
 477         }
 478         if (bo->resv != &bo->ttm_resv)
 479                 reservation_object_unlock(&bo->ttm_resv);
 480
 481 error:
 482         kref_get(&bo->list_kref);
 483         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 484         spin_unlock(&glob->lru_lock);
 485
 486         schedule_delayed_work(&bdev->wq,
 487                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 488 }
 489
 490 /**
 491  * function ttm_bo_cleanup_refs_and_unlock
 492  * If bo idle, remove from delayed- and lru lists, and unref.
 493  * If not idle, do nothing.
 494  *
 495  * Must be called with lru_lock and reservation held, this function
 496  * will drop both before returning.
 497  *
 498  * @interruptible         Any sleeps should occur interruptibly.
 499  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 500  */
 501
 502 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 503                                           bool interruptible,
 504                                           bool no_wait_gpu)
 505 {
 506         struct ttm_bo_global *glob = bo->glob;
 507         struct reservation_object *resv;
 508         int ret;
 509
 510         if (unlikely(list_empty(&bo->ddestroy)))
 511                 resv = bo->resv;
 512         else
 513                 resv = &bo->ttm_resv;
 514
 515         if (reservation_object_test_signaled_rcu(resv, true))
 516                 ret = 0;
 517         else
 518                 ret = -EBUSY;
 519
 520         if (ret && !no_wait_gpu) {
 521                 long lret;
 522                 ww_mutex_unlock(&bo->resv->lock);
 523                 spin_unlock(&glob->lru_lock);
 524
 525                 lret = reservation_object_wait_timeout_rcu(resv, true,
 526                                                            interruptible,
 527                                                            30 * HZ);
 528
 529                 if (lret < 0)
 530                         return lret;
 531                 else if (lret == 0)
 532                         return -EBUSY;
 533
 534                 spin_lock(&glob->lru_lock);
 535                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 536
 537                 /*
 538                  * We raced, and lost, someone else holds the reservation now,
 539                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 540                  *
 541                  * Even if it's not the case, because we finished waiting any
 542                  * delayed destruction would succeed, so just return success
 543                  * here.
 544                  */
 545                 if (ret) {
 546                         spin_unlock(&glob->lru_lock);
 547                         return 0;
 548                 }
 549         }
 550
 551         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 552                 __ttm_bo_unreserve(bo);
 553                 spin_unlock(&glob->lru_lock);
 554                 return ret;
 555         }
 556
 557         ttm_bo_del_from_lru(bo);
 558         list_del_init(&bo->ddestroy);
 559         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 560
 561         spin_unlock(&glob->lru_lock);
 562         ttm_bo_cleanup_memtype_use(bo);
 563
 564         return 0;
 565 }
 566
 567 /**
 568  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 569  * encountered buffers.
 570  */
 571
 572 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 573 {
 574         struct ttm_bo_global *glob = bdev->glob;
 575         struct ttm_buffer_object *entry = NULL;
 576         int ret = 0;
 577
 578         spin_lock(&glob->lru_lock);
 579         if (list_empty(&bdev->ddestroy))
 580                 goto out_unlock;
 581
 582         entry = list_first_entry(&bdev->ddestroy,
 583                 struct ttm_buffer_object, ddestroy);
 584         kref_get(&entry->list_kref);
 585
 586         for (;;) {
 587                 struct ttm_buffer_object *nentry = NULL;
 588
 589                 if (entry->ddestroy.next != &bdev->ddestroy) {
 590                         nentry = list_first_entry(&entry->ddestroy,
 591                                 struct ttm_buffer_object, ddestroy);
 592                         kref_get(&nentry->list_kref);
 593                 }
 594
 595                 ret = __ttm_bo_reserve(entry, false, true, NULL);
 596                 if (remove_all && ret) {
 597                         spin_unlock(&glob->lru_lock);
 598                         ret = __ttm_bo_reserve(entry, false, false, NULL);
 599                         spin_lock(&glob->lru_lock);
 600                 }
 601
 602                 if (!ret)
 603                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 604                                                              !remove_all);
 605                 else
 606                         spin_unlock(&glob->lru_lock);
 607
 608                 kref_put(&entry->list_kref, ttm_bo_release_list);
 609                 entry = nentry;
 610
 611                 if (ret || !entry)
 612                         goto out;
 613
 614                 spin_lock(&glob->lru_lock);
 615                 if (list_empty(&entry->ddestroy))
 616                         break;
 617         }
 618
 619 out_unlock:
 620         spin_unlock(&glob->lru_lock);
 621 out:
 622         if (entry)
 623                 kref_put(&entry->list_kref, ttm_bo_release_list);
 624         return ret;
 625 }
 626
 627 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 628 {
 629         struct ttm_bo_device *bdev =
 630             container_of(work, struct ttm_bo_device, wq.work);
 631
 632         if (ttm_bo_delayed_delete(bdev, false)) {
 633                 schedule_delayed_work(&bdev->wq,
 634                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 635         }
 636 }
 637
 638 static void ttm_bo_release(struct kref *kref)
 639 {
 640         struct ttm_buffer_object *bo =
 641             container_of(kref, struct ttm_buffer_object, kref);
 642         struct ttm_bo_device *bdev = bo->bdev;
 643         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 644
 645         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 646         ttm_mem_io_lock(man, false);
 647         ttm_mem_io_free_vm(bo);
 648         ttm_mem_io_unlock(man);
 649         ttm_bo_cleanup_refs_or_queue(bo);
 650         kref_put(&bo->list_kref, ttm_bo_release_list);
 651 }
 652
 653 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 654 {
 655         struct ttm_buffer_object *bo = *p_bo;
 656
 657         *p_bo = NULL;
 658         kref_put(&bo->kref, ttm_bo_release);
 659 }
 660 EXPORT_SYMBOL(ttm_bo_unref);
 661
 662 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 663 {
 664         return cancel_delayed_work_sync(&bdev->wq);
 665 }
 666 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 667
 668 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 669 {
 670         if (resched)
 671                 schedule_delayed_work(&bdev->wq,
 672                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 673 }
 674 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 675
 676 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 677                         bool no_wait_gpu)
 678 {
 679         struct ttm_bo_device *bdev = bo->bdev;
 680         struct ttm_mem_reg evict_mem;
 681         struct ttm_placement placement;
 682         int ret = 0;
 683
 684         lockdep_assert_held(&bo->resv->lock.base);
 685
 686         evict_mem = bo->mem;
 687         evict_mem.mm_node = NULL;
 688         evict_mem.bus.io_reserved_vm = false;
 689         evict_mem.bus.io_reserved_count = 0;
 690
 691         placement.num_placement = 0;
 692         placement.num_busy_placement = 0;
 693         bdev->driver->evict_flags(bo, &placement);
 694         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 695                                 no_wait_gpu);
 696         if (ret) {
 697                 if (ret != -ERESTARTSYS) {
 698                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 699                                bo);
 700                         ttm_bo_mem_space_debug(bo, &placement);
 701                 }
 702                 goto out;
 703         }
 704
 705         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 706                                      no_wait_gpu);
 707         if (unlikely(ret)) {
 708                 if (ret != -ERESTARTSYS)
 709                         pr_err("Buffer eviction failed\n");
 710                 ttm_bo_mem_put(bo, &evict_mem);
 711                 goto out;
 712         }
 713         bo->evicted = true;
 714 out:
 715         return ret;
 716 }
 717
 718 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 719                               const struct ttm_place *place)
 720 {
 721         /* Don't evict this BO if it's outside of the
 722          * requested placement range
 723          */
 724         if (place->fpfn >= (bo->mem.start + bo->mem.num_pages) ||
 725             (place->lpfn && place->lpfn <= bo->mem.start))
 726                 return false;
 727
 728         return true;
 729 }
 730 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 731
 732 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 733                                 uint32_t mem_type,
 734                                 const struct ttm_place *place,
 735                                 bool interruptible,
 736                                 bool no_wait_gpu)
 737 {
 738         struct ttm_bo_global *glob = bdev->glob;
 739         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 740         struct ttm_buffer_object *bo;
 741         int ret = -EBUSY;
 742         unsigned i;
 743
 744         spin_lock(&glob->lru_lock);
 745         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 746                 list_for_each_entry(bo, &man->lru[i], lru) {
 747                         ret = __ttm_bo_reserve(bo, false, true, NULL);
 748                         if (ret)
 749                                 continue;
 750
 751                         if (place && !bdev->driver->eviction_valuable(bo,
 752                                                                       place)) {
 753                                 __ttm_bo_unreserve(bo);
 754                                 ret = -EBUSY;
 755                                 continue;
 756                         }
 757
 758                         break;
 759                 }
 760
 761                 if (!ret)
 762                         break;
 763         }
 764
 765         if (ret) {
 766                 spin_unlock(&glob->lru_lock);
 767                 return ret;
 768         }
 769
 770         kref_get(&bo->list_kref);
 771
 772         if (!list_empty(&bo->ddestroy)) {
 773                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 774                                                      no_wait_gpu);
 775                 kref_put(&bo->list_kref, ttm_bo_release_list);
 776                 return ret;
 777         }
 778
 779         ttm_bo_del_from_lru(bo);
 780         spin_unlock(&glob->lru_lock);
 781
 782         BUG_ON(ret != 0);
 783
 784         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 785         ttm_bo_unreserve(bo);
 786
 787         kref_put(&bo->list_kref, ttm_bo_release_list);
 788         return ret;
 789 }
 790
 791 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 792 {
 793         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 794
 795         if (mem->mm_node)
 796                 (*man->func->put_node)(man, mem);
 797 }
 798 EXPORT_SYMBOL(ttm_bo_mem_put);
 799
 800 /**
 801  * Add the last move fence to the BO and reserve a new shared slot.
 802  */
 803 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 804                                  struct ttm_mem_type_manager *man,
 805                                  struct ttm_mem_reg *mem)
 806 {
 807         struct dma_fence *fence;
 808         int ret;
 809
 810         spin_lock(&man->move_lock);
 811         fence = dma_fence_get(man->move);
 812         spin_unlock(&man->move_lock);
 813
 814         if (fence) {
 815                 reservation_object_add_shared_fence(bo->resv, fence);
 816
 817                 ret = reservation_object_reserve_shared(bo->resv);
 818                 if (unlikely(ret))
 819                         return ret;
 820
 821                 dma_fence_put(bo->moving);
 822                 bo->moving = fence;
 823         }
 824
 825         return 0;
 826 }
 827
 828 /**
 829  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 830  * space, or we've evicted everything and there isn't enough space.
 831  */
 832 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 833                                         uint32_t mem_type,
 834                                         const struct ttm_place *place,
 835                                         struct ttm_mem_reg *mem,
 836                                         bool interruptible,
 837                                         bool no_wait_gpu)
 838 {
 839         struct ttm_bo_device *bdev = bo->bdev;
 840         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 841         int ret;
 842
 843         do {
 844                 ret = (*man->func->get_node)(man, bo, place, mem);
 845                 if (unlikely(ret != 0))
 846                         return ret;
 847                 if (mem->mm_node)
 848                         break;
 849                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 850                                           interruptible, no_wait_gpu);
 851                 if (unlikely(ret != 0))
 852                         return ret;
 853         } while (1);
 854         mem->mem_type = mem_type;
 855         return ttm_bo_add_move_fence(bo, man, mem);
 856 }
 857
 858 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 859                                       uint32_t cur_placement,
 860                                       uint32_t proposed_placement)
 861 {
 862         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 863         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 864
 865         /**
 866          * Keep current caching if possible.
 867          */
 868
 869         if ((cur_placement & caching) != 0)
 870                 result |= (cur_placement & caching);
 871         else if ((man->default_caching & caching) != 0)
 872                 result |= man->default_caching;
 873         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 874                 result |= TTM_PL_FLAG_CACHED;
 875         else if ((TTM_PL_FLAG_WC & caching) != 0)
 876                 result |= TTM_PL_FLAG_WC;
 877         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 878                 result |= TTM_PL_FLAG_UNCACHED;
 879
 880         return result;
 881 }
 882
 883 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 884                                  uint32_t mem_type,
 885                                  const struct ttm_place *place,
 886                                  uint32_t *masked_placement)
 887 {
 888         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 889
 890         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 891                 return false;
 892
 893         if ((place->flags & man->available_caching) == 0)
 894                 return false;
 895
 896         cur_flags |= (place->flags & man->available_caching);
 897
 898         *masked_placement = cur_flags;
 899         return true;
 900 }
 901
 902 /**
 903  * Creates space for memory region @mem according to its type.
 904  *
 905  * This function first searches for free space in compatible memory types in
 906  * the priority order defined by the driver.  If free space isn't found, then
 907  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 908  * space.
 909  */
 910 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 911                         struct ttm_placement *placement,
 912                         struct ttm_mem_reg *mem,
 913                         bool interruptible,
 914                         bool no_wait_gpu)
 915 {
 916         struct ttm_bo_device *bdev = bo->bdev;
 917         struct ttm_mem_type_manager *man;
 918         uint32_t mem_type = TTM_PL_SYSTEM;
 919         uint32_t cur_flags = 0;
 920         bool type_found = false;
 921         bool type_ok = false;
 922         bool has_erestartsys = false;
 923         int i, ret;
 924
 925         ret = reservation_object_reserve_shared(bo->resv);
 926         if (unlikely(ret))
 927                 return ret;
 928
 929         mem->mm_node = NULL;
 930         for (i = 0; i < placement->num_placement; ++i) {
 931                 const struct ttm_place *place = &placement->placement[i];
 932
 933                 ret = ttm_mem_type_from_place(place, &mem_type);
 934                 if (ret)
 935                         return ret;
 936                 man = &bdev->man[mem_type];
 937                 if (!man->has_type || !man->use_type)
 938                         continue;
 939
 940                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 941                                                 &cur_flags);
 942
 943                 if (!type_ok)
 944                         continue;
 945
 946                 type_found = true;
 947                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 948                                                   cur_flags);
 949                 /*
 950                  * Use the access and other non-mapping-related flag bits from
 951                  * the memory placement flags to the current flags
 952                  */
 953                 ttm_flag_masked(&cur_flags, place->flags,
 954                                 ~TTM_PL_MASK_MEMTYPE);
 955
 956                 if (mem_type == TTM_PL_SYSTEM)
 957                         break;
 958
 959                 ret = (*man->func->get_node)(man, bo, place, mem);
 960                 if (unlikely(ret))
 961                         return ret;
 962
 963                 if (mem->mm_node) {
 964                         ret = ttm_bo_add_move_fence(bo, man, mem);
 965                         if (unlikely(ret)) {
 966                                 (*man->func->put_node)(man, mem);
 967                                 return ret;
 968                         }
 969                         break;
 970                 }
 971         }
 972
 973         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 974                 mem->mem_type = mem_type;
 975                 mem->placement = cur_flags;
 976                 return 0;
 977         }
 978
 979         for (i = 0; i < placement->num_busy_placement; ++i) {
 980                 const struct ttm_place *place = &placement->busy_placement[i];
 981
 982                 ret = ttm_mem_type_from_place(place, &mem_type);
 983                 if (ret)
 984                         return ret;
 985                 man = &bdev->man[mem_type];
 986                 if (!man->has_type || !man->use_type)
 987                         continue;
 988                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 989                         continue;
 990
 991                 type_found = true;
 992                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 993                                                   cur_flags);
 994                 /*
 995                  * Use the access and other non-mapping-related flag bits from
 996                  * the memory placement flags to the current flags
 997                  */
 998                 ttm_flag_masked(&cur_flags, place->flags,
 999                                 ~TTM_PL_MASK_MEMTYPE);
1000
1001                 if (mem_type == TTM_PL_SYSTEM) {
1002                         mem->mem_type = mem_type;
1003                         mem->placement = cur_flags;
1004                         mem->mm_node = NULL;
1005                         return 0;
1006                 }
1007
1008                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
1009                                                 interruptible, no_wait_gpu);
1010                 if (ret == 0 && mem->mm_node) {
1011                         mem->placement = cur_flags;
1012                         return 0;
1013                 }
1014                 if (ret == -ERESTARTSYS)
1015                         has_erestartsys = true;
1016         }
1017
1018         if (!type_found) {
1019                 pr_err(TTM_PFX "No compatible memory type found\n");
1020                 return -EINVAL;
1021         }
1022
1023         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1024 }
1025 EXPORT_SYMBOL(ttm_bo_mem_space);
1026
1027 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1028                         struct ttm_placement *placement,
1029                         bool interruptible,
1030                         bool no_wait_gpu)
1031 {
1032         int ret = 0;
1033         struct ttm_mem_reg mem;
1034
1035         lockdep_assert_held(&bo->resv->lock.base);
1036
1037         mem.num_pages = bo->num_pages;
1038         mem.size = mem.num_pages << PAGE_SHIFT;
1039         mem.page_alignment = bo->mem.page_alignment;
1040         mem.bus.io_reserved_vm = false;
1041         mem.bus.io_reserved_count = 0;
1042         /*
1043          * Determine where to move the buffer.
1044          */
1045         ret = ttm_bo_mem_space(bo, placement, &mem,
1046                                interruptible, no_wait_gpu);
1047         if (ret)
1048                 goto out_unlock;
1049         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1050                                      interruptible, no_wait_gpu);
1051 out_unlock:
1052         if (ret && mem.mm_node)
1053                 ttm_bo_mem_put(bo, &mem);
1054         return ret;
1055 }
1056
1057 static bool ttm_bo_places_compat(const struct ttm_place *places,
1058                                  unsigned num_placement,
1059                                  struct ttm_mem_reg *mem,
1060                                  uint32_t *new_flags)
1061 {
1062         unsigned i;
1063
1064         for (i = 0; i < num_placement; i++) {
1065                 const struct ttm_place *heap = &places[i];
1066
1067                 if (mem->mm_node && (mem->start < heap->fpfn ||
1068                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1069                         continue;
1070
1071                 *new_flags = heap->flags;
1072                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1073                     (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1074                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1075                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1076                         return true;
1077         }
1078         return false;
1079 }
1080
1081 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1082                        struct ttm_mem_reg *mem,
1083                        uint32_t *new_flags)
1084 {
1085         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1086                                  mem, new_flags))
1087                 return true;
1088
1089         if ((placement->busy_placement != placement->placement ||
1090              placement->num_busy_placement > placement->num_placement) &&
1091             ttm_bo_places_compat(placement->busy_placement,
1092                                  placement->num_busy_placement,
1093                                  mem, new_flags))
1094                 return true;
1095
1096         return false;
1097 }
1098 EXPORT_SYMBOL(ttm_bo_mem_compat);
1099
1100 int ttm_bo_validate(struct ttm_buffer_object *bo,
1101                         struct ttm_placement *placement,
1102                         bool interruptible,
1103                         bool no_wait_gpu)
1104 {
1105         int ret;
1106         uint32_t new_flags;
1107
1108         lockdep_assert_held(&bo->resv->lock.base);
1109         /*
1110          * Check whether we need to move buffer.
1111          */
1112         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1113                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1114                                          no_wait_gpu);
1115                 if (ret)
1116                         return ret;
1117         } else {
1118                 /*
1119                  * Use the access and other non-mapping-related flag bits from
1120                  * the compatible memory placement flags to the active flags
1121                  */
1122                 ttm_flag_masked(&bo->mem.placement, new_flags,
1123                                 ~TTM_PL_MASK_MEMTYPE);
1124         }
1125         /*
1126          * We might need to add a TTM.
1127          */
1128         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1129                 ret = ttm_bo_add_ttm(bo, true);
1130                 if (ret)
1131                         return ret;
1132         }
1133         return 0;
1134 }
1135 EXPORT_SYMBOL(ttm_bo_validate);
1136
1137 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1138                          struct ttm_buffer_object *bo,
1139                          unsigned long size,
1140                          enum ttm_bo_type type,
1141                          struct ttm_placement *placement,
1142                          uint32_t page_alignment,
1143                          bool interruptible,
1144                          struct file *persistent_swap_storage,
1145                          size_t acc_size,
1146                          struct sg_table *sg,
1147                          struct reservation_object *resv,
1148                          void (*destroy) (struct ttm_buffer_object *))
1149 {
1150         int ret = 0;
1151         unsigned long num_pages;
1152         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1153         bool locked;
1154
1155         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1156         if (ret) {
1157                 pr_err("Out of kernel memory\n");
1158                 if (destroy)
1159                         (*destroy)(bo);
1160                 else
1161                         kfree(bo);
1162                 return -ENOMEM;
1163         }
1164
1165         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1166         if (num_pages == 0) {
1167                 pr_err("Illegal buffer object size\n");
1168                 if (destroy)
1169                         (*destroy)(bo);
1170                 else
1171                         kfree(bo);
1172                 ttm_mem_global_free(mem_glob, acc_size);
1173                 return -EINVAL;
1174         }
1175         bo->destroy = destroy;
1176
1177         kref_init(&bo->kref);
1178         kref_init(&bo->list_kref);
1179         atomic_set(&bo->cpu_writers, 0);
1180         INIT_LIST_HEAD(&bo->lru);
1181         INIT_LIST_HEAD(&bo->ddestroy);
1182         INIT_LIST_HEAD(&bo->swap);
1183         INIT_LIST_HEAD(&bo->io_reserve_lru);
1184         mutex_init(&bo->wu_mutex);
1185         bo->bdev = bdev;
1186         bo->glob = bdev->glob;
1187         bo->type = type;
1188         bo->num_pages = num_pages;
1189         bo->mem.size = num_pages << PAGE_SHIFT;
1190         bo->mem.mem_type = TTM_PL_SYSTEM;
1191         bo->mem.num_pages = bo->num_pages;
1192         bo->mem.mm_node = NULL;
1193         bo->mem.page_alignment = page_alignment;
1194         bo->mem.bus.io_reserved_vm = false;
1195         bo->mem.bus.io_reserved_count = 0;
1196         bo->moving = NULL;
1197         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1198         bo->persistent_swap_storage = persistent_swap_storage;
1199         bo->acc_size = acc_size;
1200         bo->sg = sg;
1201         if (resv) {
1202                 bo->resv = resv;
1203                 lockdep_assert_held(&bo->resv->lock.base);
1204         } else {
1205                 bo->resv = &bo->ttm_resv;
1206         }
1207         reservation_object_init(&bo->ttm_resv);
1208         atomic_inc(&bo->glob->bo_count);
1209         drm_vma_node_reset(&bo->vma_node);
1210         bo->priority = 0;
1211
1212         /*
1213          * For ttm_bo_type_device buffers, allocate
1214          * address space from the device.
1215          */
1216         if (bo->type == ttm_bo_type_device ||
1217             bo->type == ttm_bo_type_sg)
1218                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1219                                          bo->mem.num_pages);
1220
1221         /* passed reservation objects should already be locked,
1222          * since otherwise lockdep will be angered in radeon.
1223          */
1224         if (!resv) {
1225                 locked = ww_mutex_trylock(&bo->resv->lock);
1226                 WARN_ON(!locked);
1227         }
1228
1229         if (likely(!ret))
1230                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1231
1232         if (unlikely(ret)) {
1233                 if (!resv)
1234                         ttm_bo_unreserve(bo);
1235
1236                 ttm_bo_unref(&bo);
1237                 return ret;
1238         }
1239
1240         if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1241                 spin_lock(&bo->glob->lru_lock);
1242                 ttm_bo_add_to_lru(bo);
1243                 spin_unlock(&bo->glob->lru_lock);
1244         }
1245
1246         return ret;
1247 }
1248 EXPORT_SYMBOL(ttm_bo_init_reserved);
1249
1250 int ttm_bo_init(struct ttm_bo_device *bdev,
1251                 struct ttm_buffer_object *bo,
1252                 unsigned long size,
1253                 enum ttm_bo_type type,
1254                 struct ttm_placement *placement,
1255                 uint32_t page_alignment,
1256                 bool interruptible,
1257                 struct file *persistent_swap_storage,
1258                 size_t acc_size,
1259                 struct sg_table *sg,
1260                 struct reservation_object *resv,
1261                 void (*destroy) (struct ttm_buffer_object *))
1262 {
1263         int ret;
1264
1265         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1266                                    page_alignment, interruptible,
1267                                    persistent_swap_storage, acc_size,
1268                                    sg, resv, destroy);
1269         if (ret)
1270                 return ret;
1271
1272         if (!resv)
1273                 ttm_bo_unreserve(bo);
1274
1275         return 0;
1276 }
1277 EXPORT_SYMBOL(ttm_bo_init);
1278
1279 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1280                        unsigned long bo_size,
1281                        unsigned struct_size)
1282 {
1283         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1284         size_t size = 0;
1285
1286         size += ttm_round_pot(struct_size);
1287         size += ttm_round_pot(npages * sizeof(void *));
1288         size += ttm_round_pot(sizeof(struct ttm_tt));
1289         return size;
1290 }
1291 EXPORT_SYMBOL(ttm_bo_acc_size);
1292
1293 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1294                            unsigned long bo_size,
1295                            unsigned struct_size)
1296 {
1297         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1298         size_t size = 0;
1299
1300         size += ttm_round_pot(struct_size);
1301         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1302         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1303         return size;
1304 }
1305 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1306
1307 int ttm_bo_create(struct ttm_bo_device *bdev,
1308                         unsigned long size,
1309                         enum ttm_bo_type type,
1310                         struct ttm_placement *placement,
1311                         uint32_t page_alignment,
1312                         bool interruptible,
1313                         struct file *persistent_swap_storage,
1314                         struct ttm_buffer_object **p_bo)
1315 {
1316         struct ttm_buffer_object *bo;
1317         size_t acc_size;
1318         int ret;
1319
1320         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1321         if (unlikely(bo == NULL))
1322                 return -ENOMEM;
1323
1324         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1325         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1326                           interruptible, persistent_swap_storage, acc_size,
1327                           NULL, NULL, NULL);
1328         if (likely(ret == 0))
1329                 *p_bo = bo;
1330
1331         return ret;
1332 }
1333 EXPORT_SYMBOL(ttm_bo_create);
1334
1335 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1336                                    unsigned mem_type)
1337 {
1338         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1339         struct ttm_bo_global *glob = bdev->glob;
1340         struct dma_fence *fence;
1341         int ret;
1342         unsigned i;
1343
1344         /*
1345          * Can't use standard list traversal since we're unlocking.
1346          */
1347
1348         spin_lock(&glob->lru_lock);
1349         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1350                 while (!list_empty(&man->lru[i])) {
1351                         spin_unlock(&glob->lru_lock);
1352                         ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1353                         if (ret)
1354                                 return ret;
1355                         spin_lock(&glob->lru_lock);
1356                 }
1357         }
1358         spin_unlock(&glob->lru_lock);
1359
1360         spin_lock(&man->move_lock);
1361         fence = dma_fence_get(man->move);
1362         spin_unlock(&man->move_lock);
1363
1364         if (fence) {
1365                 ret = dma_fence_wait(fence, false);
1366                 dma_fence_put(fence);
1367                 if (ret)
1368                         return ret;
1369         }
1370
1371         return 0;
1372 }
1373
1374 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1375 {
1376         struct ttm_mem_type_manager *man;
1377         int ret = -EINVAL;
1378
1379         if (mem_type >= TTM_NUM_MEM_TYPES) {
1380                 pr_err("Illegal memory type %d\n", mem_type);
1381                 return ret;
1382         }
1383         man = &bdev->man[mem_type];
1384
1385         if (!man->has_type) {
1386                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1387                        mem_type);
1388                 return ret;
1389         }
1390
1391         man->use_type = false;
1392         man->has_type = false;
1393
1394         ret = 0;
1395         if (mem_type > 0) {
1396                 ret = ttm_bo_force_list_clean(bdev, mem_type);
1397                 if (ret) {
1398                         pr_err("Cleanup eviction failed\n");
1399                         return ret;
1400                 }
1401
1402                 ret = (*man->func->takedown)(man);
1403         }
1404
1405         dma_fence_put(man->move);
1406         man->move = NULL;
1407
1408         return ret;
1409 }
1410 EXPORT_SYMBOL(ttm_bo_clean_mm);
1411
1412 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1413 {
1414         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1415
1416         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1417                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1418                 return -EINVAL;
1419         }
1420
1421         if (!man->has_type) {
1422                 pr_err("Memory type %u has not been initialized\n", mem_type);
1423                 return 0;
1424         }
1425
1426         return ttm_bo_force_list_clean(bdev, mem_type);
1427 }
1428 EXPORT_SYMBOL(ttm_bo_evict_mm);
1429
1430 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1431                         unsigned long p_size)
1432 {
1433         int ret;
1434         struct ttm_mem_type_manager *man;
1435         unsigned i;
1436
1437         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1438         man = &bdev->man[type];
1439         BUG_ON(man->has_type);
1440         man->io_reserve_fastpath = true;
1441         man->use_io_reserve_lru = false;
1442         mutex_init(&man->io_reserve_mutex);
1443         spin_lock_init(&man->move_lock);
1444         INIT_LIST_HEAD(&man->io_reserve_lru);
1445
1446         ret = bdev->driver->init_mem_type(bdev, type, man);
1447         if (ret)
1448                 return ret;
1449         man->bdev = bdev;
1450
1451         if (type != TTM_PL_SYSTEM) {
1452                 ret = (*man->func->init)(man, p_size);
1453                 if (ret)
1454                         return ret;
1455         }
1456         man->has_type = true;
1457         man->use_type = true;
1458         man->size = p_size;
1459
1460         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1461                 INIT_LIST_HEAD(&man->lru[i]);
1462         man->move = NULL;
1463
1464         return 0;
1465 }
1466 EXPORT_SYMBOL(ttm_bo_init_mm);
1467
1468 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1469 {
1470         struct ttm_bo_global *glob =
1471                 container_of(kobj, struct ttm_bo_global, kobj);
1472
1473         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1474         __free_page(glob->dummy_read_page);
1475         kfree(glob);
1476 }
1477
1478 void ttm_bo_global_release(struct drm_global_reference *ref)
1479 {
1480         struct ttm_bo_global *glob = ref->object;
1481
1482         kobject_del(&glob->kobj);
1483         kobject_put(&glob->kobj);
1484 }
1485 EXPORT_SYMBOL(ttm_bo_global_release);
1486
1487 int ttm_bo_global_init(struct drm_global_reference *ref)
1488 {
1489         struct ttm_bo_global_ref *bo_ref =
1490                 container_of(ref, struct ttm_bo_global_ref, ref);
1491         struct ttm_bo_global *glob = ref->object;
1492         int ret;
1493         unsigned i;
1494
1495         mutex_init(&glob->device_list_mutex);
1496         spin_lock_init(&glob->lru_lock);
1497         glob->mem_glob = bo_ref->mem_glob;
1498         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1499
1500         if (unlikely(glob->dummy_read_page == NULL)) {
1501                 ret = -ENOMEM;
1502                 goto out_no_drp;
1503         }
1504
1505         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1506                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1507         INIT_LIST_HEAD(&glob->device_list);
1508
1509         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1510         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1511         if (unlikely(ret != 0)) {
1512                 pr_err("Could not register buffer object swapout\n");
1513                 goto out_no_shrink;
1514         }
1515
1516         atomic_set(&glob->bo_count, 0);
1517
1518         ret = kobject_init_and_add(
1519                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1520         if (unlikely(ret != 0))
1521                 kobject_put(&glob->kobj);
1522         return ret;
1523 out_no_shrink:
1524         __free_page(glob->dummy_read_page);
1525 out_no_drp:
1526         kfree(glob);
1527         return ret;
1528 }
1529 EXPORT_SYMBOL(ttm_bo_global_init);
1530
1531
1532 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1533 {
1534         int ret = 0;
1535         unsigned i = TTM_NUM_MEM_TYPES;
1536         struct ttm_mem_type_manager *man;
1537         struct ttm_bo_global *glob = bdev->glob;
1538
1539         while (i--) {
1540                 man = &bdev->man[i];
1541                 if (man->has_type) {
1542                         man->use_type = false;
1543                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1544                                 ret = -EBUSY;
1545                                 pr_err("DRM memory manager type %d is not clean\n",
1546                                        i);
1547                         }
1548                         man->has_type = false;
1549                 }
1550         }
1551
1552         mutex_lock(&glob->device_list_mutex);
1553         list_del(&bdev->device_list);
1554         mutex_unlock(&glob->device_list_mutex);
1555
1556         cancel_delayed_work_sync(&bdev->wq);
1557
1558         while (ttm_bo_delayed_delete(bdev, true))
1559                 ;
1560
1561         spin_lock(&glob->lru_lock);
1562         if (list_empty(&bdev->ddestroy))
1563                 TTM_DEBUG("Delayed destroy list was clean\n");
1564
1565         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1566                 if (list_empty(&bdev->man[0].lru[0]))
1567                         TTM_DEBUG("Swap list %d was clean\n", i);
1568         spin_unlock(&glob->lru_lock);
1569
1570         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1571
1572         return ret;
1573 }
1574 EXPORT_SYMBOL(ttm_bo_device_release);
1575
1576 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1577                        struct ttm_bo_global *glob,
1578                        struct ttm_bo_driver *driver,
1579                        struct address_space *mapping,
1580                        uint64_t file_page_offset,
1581                        bool need_dma32)
1582 {
1583         int ret = -EINVAL;
1584
1585         bdev->driver = driver;
1586
1587         memset(bdev->man, 0, sizeof(bdev->man));
1588
1589         /*
1590          * Initialize the system memory buffer type.
1591          * Other types need to be driver / IOCTL initialized.
1592          */
1593         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1594         if (unlikely(ret != 0))
1595                 goto out_no_sys;
1596
1597         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1598                                     0x10000000);
1599         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1600         INIT_LIST_HEAD(&bdev->ddestroy);
1601         bdev->dev_mapping = mapping;
1602         bdev->glob = glob;
1603         bdev->need_dma32 = need_dma32;
1604         mutex_lock(&glob->device_list_mutex);
1605         list_add_tail(&bdev->device_list, &glob->device_list);
1606         mutex_unlock(&glob->device_list_mutex);
1607
1608         return 0;
1609 out_no_sys:
1610         return ret;
1611 }
1612 EXPORT_SYMBOL(ttm_bo_device_init);
1613
1614 /*
1615  * buffer object vm functions.
1616  */
1617
1618 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1619 {
1620         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1621
1622         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1623                 if (mem->mem_type == TTM_PL_SYSTEM)
1624                         return false;
1625
1626                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1627                         return false;
1628
1629                 if (mem->placement & TTM_PL_FLAG_CACHED)
1630                         return false;
1631         }
1632         return true;
1633 }
1634
1635 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1636 {
1637         struct ttm_bo_device *bdev = bo->bdev;
1638
1639         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1640         ttm_mem_io_free_vm(bo);
1641 }
1642
1643 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1644 {
1645         struct ttm_bo_device *bdev = bo->bdev;
1646         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1647
1648         ttm_mem_io_lock(man, false);
1649         ttm_bo_unmap_virtual_locked(bo);
1650         ttm_mem_io_unlock(man);
1651 }
1652
1653
1654 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1655
1656 int ttm_bo_wait(struct ttm_buffer_object *bo,
1657                 bool interruptible, bool no_wait)
1658 {
1659         long timeout = 15 * HZ;
1660
1661         if (no_wait) {
1662                 if (reservation_object_test_signaled_rcu(bo->resv, true))
1663                         return 0;
1664                 else
1665                         return -EBUSY;
1666         }
1667
1668         timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1669                                                       interruptible, timeout);
1670         if (timeout < 0)
1671                 return timeout;
1672
1673         if (timeout == 0)
1674                 return -EBUSY;
1675
1676         reservation_object_add_excl_fence(bo->resv, NULL);
1677         return 0;
1678 }
1679 EXPORT_SYMBOL(ttm_bo_wait);
1680
1681 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1682 {
1683         int ret = 0;
1684
1685         /*
1686          * Using ttm_bo_reserve makes sure the lru lists are updated.
1687          */
1688
1689         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1690         if (unlikely(ret != 0))
1691                 return ret;
1692         ret = ttm_bo_wait(bo, true, no_wait);
1693         if (likely(ret == 0))
1694                 atomic_inc(&bo->cpu_writers);
1695         ttm_bo_unreserve(bo);
1696         return ret;
1697 }
1698 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1699
1700 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1701 {
1702         atomic_dec(&bo->cpu_writers);
1703 }
1704 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1705
1706 /**
1707  * A buffer object shrink method that tries to swap out the first
1708  * buffer object on the bo_global::swap_lru list.
1709  */
1710
1711 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1712 {
1713         struct ttm_bo_global *glob =
1714             container_of(shrink, struct ttm_bo_global, shrink);
1715         struct ttm_buffer_object *bo;
1716         int ret = -EBUSY;
1717         unsigned i;
1718
1719         spin_lock(&glob->lru_lock);
1720         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1721                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1722                         ret = __ttm_bo_reserve(bo, false, true, NULL);
1723                         if (!ret)
1724                                 break;
1725                 }
1726                 if (!ret)
1727                         break;
1728         }
1729
1730         if (ret) {
1731                 spin_unlock(&glob->lru_lock);
1732                 return ret;
1733         }
1734
1735         kref_get(&bo->list_kref);
1736
1737         if (!list_empty(&bo->ddestroy)) {
1738                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1739                 kref_put(&bo->list_kref, ttm_bo_release_list);
1740                 return ret;
1741         }
1742
1743         ttm_bo_del_from_lru(bo);
1744         spin_unlock(&glob->lru_lock);
1745
1746         /**
1747          * Move to system cached
1748          */
1749
1750         if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1751             bo->ttm->caching_state != tt_cached) {
1752                 struct ttm_mem_reg evict_mem;
1753
1754                 evict_mem = bo->mem;
1755                 evict_mem.mm_node = NULL;
1756                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1757                 evict_mem.mem_type = TTM_PL_SYSTEM;
1758
1759                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1760                                              false, false);
1761                 if (unlikely(ret != 0))
1762                         goto out;
1763         }
1764
1765         /**
1766          * Make sure BO is idle.
1767          */
1768
1769         ret = ttm_bo_wait(bo, false, false);
1770         if (unlikely(ret != 0))
1771                 goto out;
1772
1773         ttm_bo_unmap_virtual(bo);
1774
1775         /**
1776          * Swap out. Buffer will be swapped in again as soon as
1777          * anyone tries to access a ttm page.
1778          */
1779
1780         if (bo->bdev->driver->swap_notify)
1781                 bo->bdev->driver->swap_notify(bo);
1782
1783         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1784 out:
1785
1786         /**
1787          *
1788          * Unreserve without putting on LRU to avoid swapping out an
1789          * already swapped buffer.
1790          */
1791
1792         __ttm_bo_unreserve(bo);
1793         kref_put(&bo->list_kref, ttm_bo_release_list);
1794         return ret;
1795 }
1796
1797 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1798 {
1799         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1800                 ;
1801 }
1802 EXPORT_SYMBOL(ttm_bo_swapout_all);
1803
1804 /**
1805  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1806  * unreserved
1807  *
1808  * @bo: Pointer to buffer
1809  */
1810 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1811 {
1812         int ret;
1813
1814         /*
1815          * In the absense of a wait_unlocked API,
1816          * Use the bo::wu_mutex to avoid triggering livelocks due to
1817          * concurrent use of this function. Note that this use of
1818          * bo::wu_mutex can go away if we change locking order to
1819          * mmap_sem -> bo::reserve.
1820          */
1821         ret = mutex_lock_interruptible(&bo->wu_mutex);
1822         if (unlikely(ret != 0))
1823                 return -ERESTARTSYS;
1824         if (!ww_mutex_is_locked(&bo->resv->lock))
1825                 goto out_unlock;
1826         ret = __ttm_bo_reserve(bo, true, false, NULL);
1827         if (unlikely(ret != 0))
1828                 goto out_unlock;
1829         __ttm_bo_unreserve(bo);
1830
1831 out_unlock:
1832         mutex_unlock(&bo->wu_mutex);
1833         return ret;
1834 }