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 i;
  61
  62         for (i = 0; i <= TTM_PL_PRIV5; i++)
  63                 if (place->flags & (1 << i)) {
  64                         *mem_type = i;
  65                         return 0;
  66                 }
  67         return -EINVAL;
  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(atomic_read(&bo->list_kref.refcount));
 144         BUG_ON(atomic_read(&bo->kref.refcount));
 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
 150         if (bo->ttm)
 151                 ttm_tt_destroy(bo->ttm);
 152         atomic_dec(&bo->glob->bo_count);
 153         if (bo->resv == &bo->ttm_resv)
 154                 reservation_object_fini(&bo->ttm_resv);
 155         mutex_destroy(&bo->wu_mutex);
 156         if (bo->destroy)
 157                 bo->destroy(bo);
 158         else {
 159                 kfree(bo);
 160         }
 161         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 162 }
 163
 164 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 165 {
 166         struct ttm_bo_device *bdev = bo->bdev;
 167         struct ttm_mem_type_manager *man;
 168
 169         lockdep_assert_held(&bo->resv->lock.base);
 170
 171         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 172
 173                 BUG_ON(!list_empty(&bo->lru));
 174
 175                 man = &bdev->man[bo->mem.mem_type];
 176                 list_add_tail(&bo->lru, &man->lru);
 177                 kref_get(&bo->list_kref);
 178
 179                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 180                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 181                         kref_get(&bo->list_kref);
 182                 }
 183         }
 184 }
 185 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 186
 187 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 188 {
 189         int put_count = 0;
 190
 191         if (!list_empty(&bo->swap)) {
 192                 list_del_init(&bo->swap);
 193                 ++put_count;
 194         }
 195         if (!list_empty(&bo->lru)) {
 196                 list_del_init(&bo->lru);
 197                 ++put_count;
 198         }
 199
 200         /*
 201          * TODO: Add a driver hook to delete from
 202          * driver-specific LRU's here.
 203          */
 204
 205         return put_count;
 206 }
 207
 208 static void ttm_bo_ref_bug(struct kref *list_kref)
 209 {
 210         BUG();
 211 }
 212
 213 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 214                          bool never_free)
 215 {
 216         kref_sub(&bo->list_kref, count,
 217                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 218 }
 219
 220 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 221 {
 222         int put_count;
 223
 224         spin_lock(&bo->glob->lru_lock);
 225         put_count = ttm_bo_del_from_lru(bo);
 226         spin_unlock(&bo->glob->lru_lock);
 227         ttm_bo_list_ref_sub(bo, put_count, true);
 228 }
 229 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 230
 231 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 232 {
 233         struct ttm_bo_device *bdev = bo->bdev;
 234         struct ttm_mem_type_manager *man;
 235
 236         lockdep_assert_held(&bo->resv->lock.base);
 237
 238         if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 239                 list_del_init(&bo->swap);
 240                 list_del_init(&bo->lru);
 241
 242         } else {
 243                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG))
 244                         list_move_tail(&bo->swap, &bo->glob->swap_lru);
 245
 246                 man = &bdev->man[bo->mem.mem_type];
 247                 list_move_tail(&bo->lru, &man->lru);
 248         }
 249 }
 250 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 251
 252 /*
 253  * Call bo->mutex locked.
 254  */
 255 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 256 {
 257         struct ttm_bo_device *bdev = bo->bdev;
 258         struct ttm_bo_global *glob = bo->glob;
 259         int ret = 0;
 260         uint32_t page_flags = 0;
 261
 262         TTM_ASSERT_LOCKED(&bo->mutex);
 263         bo->ttm = NULL;
 264
 265         if (bdev->need_dma32)
 266                 page_flags |= TTM_PAGE_FLAG_DMA32;
 267
 268         switch (bo->type) {
 269         case ttm_bo_type_device:
 270                 if (zero_alloc)
 271                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 272         case ttm_bo_type_kernel:
 273                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 274                                                       page_flags, glob->dummy_read_page);
 275                 if (unlikely(bo->ttm == NULL))
 276                         ret = -ENOMEM;
 277                 break;
 278         case ttm_bo_type_sg:
 279                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 280                                                       page_flags | TTM_PAGE_FLAG_SG,
 281                                                       glob->dummy_read_page);
 282                 if (unlikely(bo->ttm == NULL)) {
 283                         ret = -ENOMEM;
 284                         break;
 285                 }
 286                 bo->ttm->sg = bo->sg;
 287                 break;
 288         default:
 289                 pr_err("Illegal buffer object type\n");
 290                 ret = -EINVAL;
 291                 break;
 292         }
 293
 294         return ret;
 295 }
 296
 297 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 298                                   struct ttm_mem_reg *mem,
 299                                   bool evict, bool interruptible,
 300                                   bool no_wait_gpu)
 301 {
 302         struct ttm_bo_device *bdev = bo->bdev;
 303         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 304         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 305         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 306         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 307         int ret = 0;
 308
 309         if (old_is_pci || new_is_pci ||
 310             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 311                 ret = ttm_mem_io_lock(old_man, true);
 312                 if (unlikely(ret != 0))
 313                         goto out_err;
 314                 ttm_bo_unmap_virtual_locked(bo);
 315                 ttm_mem_io_unlock(old_man);
 316         }
 317
 318         /*
 319          * Create and bind a ttm if required.
 320          */
 321
 322         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 323                 if (bo->ttm == NULL) {
 324                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 325                         ret = ttm_bo_add_ttm(bo, zero);
 326                         if (ret)
 327                                 goto out_err;
 328                 }
 329
 330                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 331                 if (ret)
 332                         goto out_err;
 333
 334                 if (mem->mem_type != TTM_PL_SYSTEM) {
 335                         ret = ttm_tt_bind(bo->ttm, mem);
 336                         if (ret)
 337                                 goto out_err;
 338                 }
 339
 340                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 341                         if (bdev->driver->move_notify)
 342                                 bdev->driver->move_notify(bo, mem);
 343                         bo->mem = *mem;
 344                         mem->mm_node = NULL;
 345                         goto moved;
 346                 }
 347         }
 348
 349         if (bdev->driver->move_notify)
 350                 bdev->driver->move_notify(bo, mem);
 351
 352         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 353             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 354                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 355         else if (bdev->driver->move)
 356                 ret = bdev->driver->move(bo, evict, interruptible,
 357                                          no_wait_gpu, mem);
 358         else
 359                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 360
 361         if (ret) {
 362                 if (bdev->driver->move_notify) {
 363                         struct ttm_mem_reg tmp_mem = *mem;
 364                         *mem = bo->mem;
 365                         bo->mem = tmp_mem;
 366                         bdev->driver->move_notify(bo, mem);
 367                         bo->mem = *mem;
 368                         *mem = tmp_mem;
 369                 }
 370
 371                 goto out_err;
 372         }
 373
 374 moved:
 375         if (bo->evicted) {
 376                 if (bdev->driver->invalidate_caches) {
 377                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 378                         if (ret)
 379                                 pr_err("Can not flush read caches\n");
 380                 }
 381                 bo->evicted = false;
 382         }
 383
 384         if (bo->mem.mm_node) {
 385                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 386                     bdev->man[bo->mem.mem_type].gpu_offset;
 387                 bo->cur_placement = bo->mem.placement;
 388         } else
 389                 bo->offset = 0;
 390
 391         return 0;
 392
 393 out_err:
 394         new_man = &bdev->man[bo->mem.mem_type];
 395         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 396                 ttm_tt_unbind(bo->ttm);
 397                 ttm_tt_destroy(bo->ttm);
 398                 bo->ttm = NULL;
 399         }
 400
 401         return ret;
 402 }
 403
 404 /**
 405  * Call bo::reserved.
 406  * Will release GPU memory type usage on destruction.
 407  * This is the place to put in driver specific hooks to release
 408  * driver private resources.
 409  * Will release the bo::reserved lock.
 410  */
 411
 412 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 413 {
 414         if (bo->bdev->driver->move_notify)
 415                 bo->bdev->driver->move_notify(bo, NULL);
 416
 417         if (bo->ttm) {
 418                 ttm_tt_unbind(bo->ttm);
 419                 ttm_tt_destroy(bo->ttm);
 420                 bo->ttm = NULL;
 421         }
 422         ttm_bo_mem_put(bo, &bo->mem);
 423
 424         ww_mutex_unlock (&bo->resv->lock);
 425 }
 426
 427 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 428 {
 429         struct reservation_object_list *fobj;
 430         struct fence *fence;
 431         int i;
 432
 433         fobj = reservation_object_get_list(bo->resv);
 434         fence = reservation_object_get_excl(bo->resv);
 435         if (fence && !fence->ops->signaled)
 436                 fence_enable_sw_signaling(fence);
 437
 438         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 439                 fence = rcu_dereference_protected(fobj->shared[i],
 440                                         reservation_object_held(bo->resv));
 441
 442                 if (!fence->ops->signaled)
 443                         fence_enable_sw_signaling(fence);
 444         }
 445 }
 446
 447 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 448 {
 449         struct ttm_bo_device *bdev = bo->bdev;
 450         struct ttm_bo_global *glob = bo->glob;
 451         int put_count;
 452         int ret;
 453
 454         spin_lock(&glob->lru_lock);
 455         ret = __ttm_bo_reserve(bo, false, true, NULL);
 456
 457         if (!ret) {
 458                 if (!ttm_bo_wait(bo, false, true)) {
 459                         put_count = ttm_bo_del_from_lru(bo);
 460
 461                         spin_unlock(&glob->lru_lock);
 462                         ttm_bo_cleanup_memtype_use(bo);
 463
 464                         ttm_bo_list_ref_sub(bo, put_count, true);
 465
 466                         return;
 467                 } else
 468                         ttm_bo_flush_all_fences(bo);
 469
 470                 /*
 471                  * Make NO_EVICT bos immediately available to
 472                  * shrinkers, now that they are queued for
 473                  * destruction.
 474                  */
 475                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 476                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 477                         ttm_bo_add_to_lru(bo);
 478                 }
 479
 480                 __ttm_bo_unreserve(bo);
 481         }
 482
 483         kref_get(&bo->list_kref);
 484         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 485         spin_unlock(&glob->lru_lock);
 486
 487         schedule_delayed_work(&bdev->wq,
 488                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 489 }
 490
 491 /**
 492  * function ttm_bo_cleanup_refs_and_unlock
 493  * If bo idle, remove from delayed- and lru lists, and unref.
 494  * If not idle, do nothing.
 495  *
 496  * Must be called with lru_lock and reservation held, this function
 497  * will drop both before returning.
 498  *
 499  * @interruptible         Any sleeps should occur interruptibly.
 500  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 501  */
 502
 503 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 504                                           bool interruptible,
 505                                           bool no_wait_gpu)
 506 {
 507         struct ttm_bo_global *glob = bo->glob;
 508         int put_count;
 509         int ret;
 510
 511         ret = ttm_bo_wait(bo, false, true);
 512
 513         if (ret && !no_wait_gpu) {
 514                 long lret;
 515                 ww_mutex_unlock(&bo->resv->lock);
 516                 spin_unlock(&glob->lru_lock);
 517
 518                 lret = reservation_object_wait_timeout_rcu(bo->resv,
 519                                                            true,
 520                                                            interruptible,
 521                                                            30 * HZ);
 522
 523                 if (lret < 0)
 524                         return lret;
 525                 else if (lret == 0)
 526                         return -EBUSY;
 527
 528                 spin_lock(&glob->lru_lock);
 529                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 530
 531                 /*
 532                  * We raced, and lost, someone else holds the reservation now,
 533                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 534                  *
 535                  * Even if it's not the case, because we finished waiting any
 536                  * delayed destruction would succeed, so just return success
 537                  * here.
 538                  */
 539                 if (ret) {
 540                         spin_unlock(&glob->lru_lock);
 541                         return 0;
 542                 }
 543
 544                 /*
 545                  * remove sync_obj with ttm_bo_wait, the wait should be
 546                  * finished, and no new wait object should have been added.
 547                  */
 548                 ret = ttm_bo_wait(bo, false, true);
 549                 WARN_ON(ret);
 550         }
 551
 552         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 553                 __ttm_bo_unreserve(bo);
 554                 spin_unlock(&glob->lru_lock);
 555                 return ret;
 556         }
 557
 558         put_count = ttm_bo_del_from_lru(bo);
 559         list_del_init(&bo->ddestroy);
 560         ++put_count;
 561
 562         spin_unlock(&glob->lru_lock);
 563         ttm_bo_cleanup_memtype_use(bo);
 564
 565         ttm_bo_list_ref_sub(bo, put_count, true);
 566
 567         return 0;
 568 }
 569
 570 /**
 571  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 572  * encountered buffers.
 573  */
 574
 575 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 576 {
 577         struct ttm_bo_global *glob = bdev->glob;
 578         struct ttm_buffer_object *entry = NULL;
 579         int ret = 0;
 580
 581         spin_lock(&glob->lru_lock);
 582         if (list_empty(&bdev->ddestroy))
 583                 goto out_unlock;
 584
 585         entry = list_first_entry(&bdev->ddestroy,
 586                 struct ttm_buffer_object, ddestroy);
 587         kref_get(&entry->list_kref);
 588
 589         for (;;) {
 590                 struct ttm_buffer_object *nentry = NULL;
 591
 592                 if (entry->ddestroy.next != &bdev->ddestroy) {
 593                         nentry = list_first_entry(&entry->ddestroy,
 594                                 struct ttm_buffer_object, ddestroy);
 595                         kref_get(&nentry->list_kref);
 596                 }
 597
 598                 ret = __ttm_bo_reserve(entry, false, true, NULL);
 599                 if (remove_all && ret) {
 600                         spin_unlock(&glob->lru_lock);
 601                         ret = __ttm_bo_reserve(entry, false, false, NULL);
 602                         spin_lock(&glob->lru_lock);
 603                 }
 604
 605                 if (!ret)
 606                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 607                                                              !remove_all);
 608                 else
 609                         spin_unlock(&glob->lru_lock);
 610
 611                 kref_put(&entry->list_kref, ttm_bo_release_list);
 612                 entry = nentry;
 613
 614                 if (ret || !entry)
 615                         goto out;
 616
 617                 spin_lock(&glob->lru_lock);
 618                 if (list_empty(&entry->ddestroy))
 619                         break;
 620         }
 621
 622 out_unlock:
 623         spin_unlock(&glob->lru_lock);
 624 out:
 625         if (entry)
 626                 kref_put(&entry->list_kref, ttm_bo_release_list);
 627         return ret;
 628 }
 629
 630 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 631 {
 632         struct ttm_bo_device *bdev =
 633             container_of(work, struct ttm_bo_device, wq.work);
 634
 635         if (ttm_bo_delayed_delete(bdev, false)) {
 636                 schedule_delayed_work(&bdev->wq,
 637                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 638         }
 639 }
 640
 641 static void ttm_bo_release(struct kref *kref)
 642 {
 643         struct ttm_buffer_object *bo =
 644             container_of(kref, struct ttm_buffer_object, kref);
 645         struct ttm_bo_device *bdev = bo->bdev;
 646         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 647
 648         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 649         ttm_mem_io_lock(man, false);
 650         ttm_mem_io_free_vm(bo);
 651         ttm_mem_io_unlock(man);
 652         ttm_bo_cleanup_refs_or_queue(bo);
 653         kref_put(&bo->list_kref, ttm_bo_release_list);
 654 }
 655
 656 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 657 {
 658         struct ttm_buffer_object *bo = *p_bo;
 659
 660         *p_bo = NULL;
 661         kref_put(&bo->kref, ttm_bo_release);
 662 }
 663 EXPORT_SYMBOL(ttm_bo_unref);
 664
 665 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 666 {
 667         return cancel_delayed_work_sync(&bdev->wq);
 668 }
 669 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 670
 671 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 672 {
 673         if (resched)
 674                 schedule_delayed_work(&bdev->wq,
 675                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 676 }
 677 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 678
 679 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 680                         bool no_wait_gpu)
 681 {
 682         struct ttm_bo_device *bdev = bo->bdev;
 683         struct ttm_mem_reg evict_mem;
 684         struct ttm_placement placement;
 685         int ret = 0;
 686
 687         ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
 688
 689         if (unlikely(ret != 0)) {
 690                 if (ret != -ERESTARTSYS) {
 691                         pr_err("Failed to expire sync object before buffer eviction\n");
 692                 }
 693                 goto out;
 694         }
 695
 696         lockdep_assert_held(&bo->resv->lock.base);
 697
 698         evict_mem = bo->mem;
 699         evict_mem.mm_node = NULL;
 700         evict_mem.bus.io_reserved_vm = false;
 701         evict_mem.bus.io_reserved_count = 0;
 702
 703         placement.num_placement = 0;
 704         placement.num_busy_placement = 0;
 705         bdev->driver->evict_flags(bo, &placement);
 706         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 707                                 no_wait_gpu);
 708         if (ret) {
 709                 if (ret != -ERESTARTSYS) {
 710                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 711                                bo);
 712                         ttm_bo_mem_space_debug(bo, &placement);
 713                 }
 714                 goto out;
 715         }
 716
 717         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 718                                      no_wait_gpu);
 719         if (ret) {
 720                 if (ret != -ERESTARTSYS)
 721                         pr_err("Buffer eviction failed\n");
 722                 ttm_bo_mem_put(bo, &evict_mem);
 723                 goto out;
 724         }
 725         bo->evicted = true;
 726 out:
 727         return ret;
 728 }
 729
 730 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 731                                 uint32_t mem_type,
 732                                 const struct ttm_place *place,
 733                                 bool interruptible,
 734                                 bool no_wait_gpu)
 735 {
 736         struct ttm_bo_global *glob = bdev->glob;
 737         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 738         struct ttm_buffer_object *bo;
 739         int ret = -EBUSY, put_count;
 740
 741         spin_lock(&glob->lru_lock);
 742         list_for_each_entry(bo, &man->lru, lru) {
 743                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 744                 if (!ret) {
 745                         if (place && (place->fpfn || place->lpfn)) {
 746                                 /* Don't evict this BO if it's outside of the
 747                                  * requested placement range
 748                                  */
 749                                 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 750                                     (place->lpfn && place->lpfn <= bo->mem.start)) {
 751                                         __ttm_bo_unreserve(bo);
 752                                         ret = -EBUSY;
 753                                         continue;
 754                                 }
 755                         }
 756
 757                         break;
 758                 }
 759         }
 760
 761         if (ret) {
 762                 spin_unlock(&glob->lru_lock);
 763                 return ret;
 764         }
 765
 766         kref_get(&bo->list_kref);
 767
 768         if (!list_empty(&bo->ddestroy)) {
 769                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 770                                                      no_wait_gpu);
 771                 kref_put(&bo->list_kref, ttm_bo_release_list);
 772                 return ret;
 773         }
 774
 775         put_count = ttm_bo_del_from_lru(bo);
 776         spin_unlock(&glob->lru_lock);
 777
 778         BUG_ON(ret != 0);
 779
 780         ttm_bo_list_ref_sub(bo, put_count, true);
 781
 782         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 783         ttm_bo_unreserve(bo);
 784
 785         kref_put(&bo->list_kref, ttm_bo_release_list);
 786         return ret;
 787 }
 788
 789 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 790 {
 791         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 792
 793         if (mem->mm_node)
 794                 (*man->func->put_node)(man, mem);
 795 }
 796 EXPORT_SYMBOL(ttm_bo_mem_put);
 797
 798 /**
 799  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 800  * space, or we've evicted everything and there isn't enough space.
 801  */
 802 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 803                                         uint32_t mem_type,
 804                                         const struct ttm_place *place,
 805                                         struct ttm_mem_reg *mem,
 806                                         bool interruptible,
 807                                         bool no_wait_gpu)
 808 {
 809         struct ttm_bo_device *bdev = bo->bdev;
 810         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 811         int ret;
 812
 813         do {
 814                 ret = (*man->func->get_node)(man, bo, place, mem);
 815                 if (unlikely(ret != 0))
 816                         return ret;
 817                 if (mem->mm_node)
 818                         break;
 819                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 820                                           interruptible, no_wait_gpu);
 821                 if (unlikely(ret != 0))
 822                         return ret;
 823         } while (1);
 824         if (mem->mm_node == NULL)
 825                 return -ENOMEM;
 826         mem->mem_type = mem_type;
 827         return 0;
 828 }
 829
 830 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 831                                       uint32_t cur_placement,
 832                                       uint32_t proposed_placement)
 833 {
 834         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 835         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 836
 837         /**
 838          * Keep current caching if possible.
 839          */
 840
 841         if ((cur_placement & caching) != 0)
 842                 result |= (cur_placement & caching);
 843         else if ((man->default_caching & caching) != 0)
 844                 result |= man->default_caching;
 845         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 846                 result |= TTM_PL_FLAG_CACHED;
 847         else if ((TTM_PL_FLAG_WC & caching) != 0)
 848                 result |= TTM_PL_FLAG_WC;
 849         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 850                 result |= TTM_PL_FLAG_UNCACHED;
 851
 852         return result;
 853 }
 854
 855 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 856                                  uint32_t mem_type,
 857                                  const struct ttm_place *place,
 858                                  uint32_t *masked_placement)
 859 {
 860         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 861
 862         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 863                 return false;
 864
 865         if ((place->flags & man->available_caching) == 0)
 866                 return false;
 867
 868         cur_flags |= (place->flags & man->available_caching);
 869
 870         *masked_placement = cur_flags;
 871         return true;
 872 }
 873
 874 /**
 875  * Creates space for memory region @mem according to its type.
 876  *
 877  * This function first searches for free space in compatible memory types in
 878  * the priority order defined by the driver.  If free space isn't found, then
 879  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 880  * space.
 881  */
 882 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 883                         struct ttm_placement *placement,
 884                         struct ttm_mem_reg *mem,
 885                         bool interruptible,
 886                         bool no_wait_gpu)
 887 {
 888         struct ttm_bo_device *bdev = bo->bdev;
 889         struct ttm_mem_type_manager *man;
 890         uint32_t mem_type = TTM_PL_SYSTEM;
 891         uint32_t cur_flags = 0;
 892         bool type_found = false;
 893         bool type_ok = false;
 894         bool has_erestartsys = false;
 895         int i, ret;
 896
 897         mem->mm_node = NULL;
 898         for (i = 0; i < placement->num_placement; ++i) {
 899                 const struct ttm_place *place = &placement->placement[i];
 900
 901                 ret = ttm_mem_type_from_place(place, &mem_type);
 902                 if (ret)
 903                         return ret;
 904                 man = &bdev->man[mem_type];
 905                 if (!man->has_type || !man->use_type)
 906                         continue;
 907
 908                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 909                                                 &cur_flags);
 910
 911                 if (!type_ok)
 912                         continue;
 913
 914                 type_found = true;
 915                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 916                                                   cur_flags);
 917                 /*
 918                  * Use the access and other non-mapping-related flag bits from
 919                  * the memory placement flags to the current flags
 920                  */
 921                 ttm_flag_masked(&cur_flags, place->flags,
 922                                 ~TTM_PL_MASK_MEMTYPE);
 923
 924                 if (mem_type == TTM_PL_SYSTEM)
 925                         break;
 926
 927                 ret = (*man->func->get_node)(man, bo, place, mem);
 928                 if (unlikely(ret))
 929                         return ret;
 930
 931                 if (mem->mm_node)
 932                         break;
 933         }
 934
 935         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 936                 mem->mem_type = mem_type;
 937                 mem->placement = cur_flags;
 938                 return 0;
 939         }
 940
 941         for (i = 0; i < placement->num_busy_placement; ++i) {
 942                 const struct ttm_place *place = &placement->busy_placement[i];
 943
 944                 ret = ttm_mem_type_from_place(place, &mem_type);
 945                 if (ret)
 946                         return ret;
 947                 man = &bdev->man[mem_type];
 948                 if (!man->has_type || !man->use_type)
 949                         continue;
 950                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 951                         continue;
 952
 953                 type_found = true;
 954                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 955                                                   cur_flags);
 956                 /*
 957                  * Use the access and other non-mapping-related flag bits from
 958                  * the memory placement flags to the current flags
 959                  */
 960                 ttm_flag_masked(&cur_flags, place->flags,
 961                                 ~TTM_PL_MASK_MEMTYPE);
 962
 963                 if (mem_type == TTM_PL_SYSTEM) {
 964                         mem->mem_type = mem_type;
 965                         mem->placement = cur_flags;
 966                         mem->mm_node = NULL;
 967                         return 0;
 968                 }
 969
 970                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
 971                                                 interruptible, no_wait_gpu);
 972                 if (ret == 0 && mem->mm_node) {
 973                         mem->placement = cur_flags;
 974                         return 0;
 975                 }
 976                 if (ret == -ERESTARTSYS)
 977                         has_erestartsys = true;
 978         }
 979
 980         if (!type_found) {
 981                 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
 982                 return -EINVAL;
 983         }
 984
 985         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
 986 }
 987 EXPORT_SYMBOL(ttm_bo_mem_space);
 988
 989 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 990                         struct ttm_placement *placement,
 991                         bool interruptible,
 992                         bool no_wait_gpu)
 993 {
 994         int ret = 0;
 995         struct ttm_mem_reg mem;
 996
 997         lockdep_assert_held(&bo->resv->lock.base);
 998
 999         /*
1000          * Don't wait for the BO on initial allocation. This is important when
1001          * the BO has an imported reservation object.
1002          */
1003         if (bo->mem.mem_type != TTM_PL_SYSTEM || bo->ttm != NULL) {
1004                 /*
1005                  * FIXME: It's possible to pipeline buffer moves.
1006                  * Have the driver move function wait for idle when necessary,
1007                  * instead of doing it here.
1008                  */
1009                 ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
1010                 if (ret)
1011                         return ret;
1012         }
1013         mem.num_pages = bo->num_pages;
1014         mem.size = mem.num_pages << PAGE_SHIFT;
1015         mem.page_alignment = bo->mem.page_alignment;
1016         mem.bus.io_reserved_vm = false;
1017         mem.bus.io_reserved_count = 0;
1018         /*
1019          * Determine where to move the buffer.
1020          */
1021         ret = ttm_bo_mem_space(bo, placement, &mem,
1022                                interruptible, no_wait_gpu);
1023         if (ret)
1024                 goto out_unlock;
1025         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1026                                      interruptible, no_wait_gpu);
1027 out_unlock:
1028         if (ret && mem.mm_node)
1029                 ttm_bo_mem_put(bo, &mem);
1030         return ret;
1031 }
1032
1033 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1034                               struct ttm_mem_reg *mem,
1035                               uint32_t *new_flags)
1036 {
1037         int i;
1038
1039         for (i = 0; i < placement->num_placement; i++) {
1040                 const struct ttm_place *heap = &placement->placement[i];
1041                 if (mem->mm_node &&
1042                     (mem->start < heap->fpfn ||
1043                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1044                         continue;
1045
1046                 *new_flags = heap->flags;
1047                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1048                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1049                         return true;
1050         }
1051
1052         for (i = 0; i < placement->num_busy_placement; i++) {
1053                 const struct ttm_place *heap = &placement->busy_placement[i];
1054                 if (mem->mm_node &&
1055                     (mem->start < heap->fpfn ||
1056                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1057                         continue;
1058
1059                 *new_flags = heap->flags;
1060                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1061                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1062                         return true;
1063         }
1064
1065         return false;
1066 }
1067
1068 int ttm_bo_validate(struct ttm_buffer_object *bo,
1069                         struct ttm_placement *placement,
1070                         bool interruptible,
1071                         bool no_wait_gpu)
1072 {
1073         int ret;
1074         uint32_t new_flags;
1075
1076         lockdep_assert_held(&bo->resv->lock.base);
1077         /*
1078          * Check whether we need to move buffer.
1079          */
1080         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1081                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1082                                          no_wait_gpu);
1083                 if (ret)
1084                         return ret;
1085         } else {
1086                 /*
1087                  * Use the access and other non-mapping-related flag bits from
1088                  * the compatible memory placement flags to the active flags
1089                  */
1090                 ttm_flag_masked(&bo->mem.placement, new_flags,
1091                                 ~TTM_PL_MASK_MEMTYPE);
1092         }
1093         /*
1094          * We might need to add a TTM.
1095          */
1096         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1097                 ret = ttm_bo_add_ttm(bo, true);
1098                 if (ret)
1099                         return ret;
1100         }
1101         return 0;
1102 }
1103 EXPORT_SYMBOL(ttm_bo_validate);
1104
1105 int ttm_bo_init(struct ttm_bo_device *bdev,
1106                 struct ttm_buffer_object *bo,
1107                 unsigned long size,
1108                 enum ttm_bo_type type,
1109                 struct ttm_placement *placement,
1110                 uint32_t page_alignment,
1111                 bool interruptible,
1112                 struct file *persistent_swap_storage,
1113                 size_t acc_size,
1114                 struct sg_table *sg,
1115                 struct reservation_object *resv,
1116                 void (*destroy) (struct ttm_buffer_object *))
1117 {
1118         int ret = 0;
1119         unsigned long num_pages;
1120         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1121         bool locked;
1122
1123         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1124         if (ret) {
1125                 pr_err("Out of kernel memory\n");
1126                 if (destroy)
1127                         (*destroy)(bo);
1128                 else
1129                         kfree(bo);
1130                 return -ENOMEM;
1131         }
1132
1133         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1134         if (num_pages == 0) {
1135                 pr_err("Illegal buffer object size\n");
1136                 if (destroy)
1137                         (*destroy)(bo);
1138                 else
1139                         kfree(bo);
1140                 ttm_mem_global_free(mem_glob, acc_size);
1141                 return -EINVAL;
1142         }
1143         bo->destroy = destroy;
1144
1145         kref_init(&bo->kref);
1146         kref_init(&bo->list_kref);
1147         atomic_set(&bo->cpu_writers, 0);
1148         INIT_LIST_HEAD(&bo->lru);
1149         INIT_LIST_HEAD(&bo->ddestroy);
1150         INIT_LIST_HEAD(&bo->swap);
1151         INIT_LIST_HEAD(&bo->io_reserve_lru);
1152         mutex_init(&bo->wu_mutex);
1153         bo->bdev = bdev;
1154         bo->glob = bdev->glob;
1155         bo->type = type;
1156         bo->num_pages = num_pages;
1157         bo->mem.size = num_pages << PAGE_SHIFT;
1158         bo->mem.mem_type = TTM_PL_SYSTEM;
1159         bo->mem.num_pages = bo->num_pages;
1160         bo->mem.mm_node = NULL;
1161         bo->mem.page_alignment = page_alignment;
1162         bo->mem.bus.io_reserved_vm = false;
1163         bo->mem.bus.io_reserved_count = 0;
1164         bo->priv_flags = 0;
1165         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1166         bo->persistent_swap_storage = persistent_swap_storage;
1167         bo->acc_size = acc_size;
1168         bo->sg = sg;
1169         if (resv) {
1170                 bo->resv = resv;
1171                 lockdep_assert_held(&bo->resv->lock.base);
1172         } else {
1173                 bo->resv = &bo->ttm_resv;
1174                 reservation_object_init(&bo->ttm_resv);
1175         }
1176         atomic_inc(&bo->glob->bo_count);
1177         drm_vma_node_reset(&bo->vma_node);
1178
1179         /*
1180          * For ttm_bo_type_device buffers, allocate
1181          * address space from the device.
1182          */
1183         if (bo->type == ttm_bo_type_device ||
1184             bo->type == ttm_bo_type_sg)
1185                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1186                                          bo->mem.num_pages);
1187
1188         /* passed reservation objects should already be locked,
1189          * since otherwise lockdep will be angered in radeon.
1190          */
1191         if (!resv) {
1192                 locked = ww_mutex_trylock(&bo->resv->lock);
1193                 WARN_ON(!locked);
1194         }
1195
1196         if (likely(!ret))
1197                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1198
1199         if (!resv) {
1200                 ttm_bo_unreserve(bo);
1201
1202         } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1203                 spin_lock(&bo->glob->lru_lock);
1204                 ttm_bo_add_to_lru(bo);
1205                 spin_unlock(&bo->glob->lru_lock);
1206         }
1207
1208         if (unlikely(ret))
1209                 ttm_bo_unref(&bo);
1210
1211         return ret;
1212 }
1213 EXPORT_SYMBOL(ttm_bo_init);
1214
1215 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1216                        unsigned long bo_size,
1217                        unsigned struct_size)
1218 {
1219         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1220         size_t size = 0;
1221
1222         size += ttm_round_pot(struct_size);
1223         size += ttm_round_pot(npages * sizeof(void *));
1224         size += ttm_round_pot(sizeof(struct ttm_tt));
1225         return size;
1226 }
1227 EXPORT_SYMBOL(ttm_bo_acc_size);
1228
1229 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1230                            unsigned long bo_size,
1231                            unsigned struct_size)
1232 {
1233         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1234         size_t size = 0;
1235
1236         size += ttm_round_pot(struct_size);
1237         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1238         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1239         return size;
1240 }
1241 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1242
1243 int ttm_bo_create(struct ttm_bo_device *bdev,
1244                         unsigned long size,
1245                         enum ttm_bo_type type,
1246                         struct ttm_placement *placement,
1247                         uint32_t page_alignment,
1248                         bool interruptible,
1249                         struct file *persistent_swap_storage,
1250                         struct ttm_buffer_object **p_bo)
1251 {
1252         struct ttm_buffer_object *bo;
1253         size_t acc_size;
1254         int ret;
1255
1256         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1257         if (unlikely(bo == NULL))
1258                 return -ENOMEM;
1259
1260         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1261         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1262                           interruptible, persistent_swap_storage, acc_size,
1263                           NULL, NULL, NULL);
1264         if (likely(ret == 0))
1265                 *p_bo = bo;
1266
1267         return ret;
1268 }
1269 EXPORT_SYMBOL(ttm_bo_create);
1270
1271 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1272                                         unsigned mem_type, bool allow_errors)
1273 {
1274         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1275         struct ttm_bo_global *glob = bdev->glob;
1276         int ret;
1277
1278         /*
1279          * Can't use standard list traversal since we're unlocking.
1280          */
1281
1282         spin_lock(&glob->lru_lock);
1283         while (!list_empty(&man->lru)) {
1284                 spin_unlock(&glob->lru_lock);
1285                 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1286                 if (ret) {
1287                         if (allow_errors) {
1288                                 return ret;
1289                         } else {
1290                                 pr_err("Cleanup eviction failed\n");
1291                         }
1292                 }
1293                 spin_lock(&glob->lru_lock);
1294         }
1295         spin_unlock(&glob->lru_lock);
1296         return 0;
1297 }
1298
1299 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1300 {
1301         struct ttm_mem_type_manager *man;
1302         int ret = -EINVAL;
1303
1304         if (mem_type >= TTM_NUM_MEM_TYPES) {
1305                 pr_err("Illegal memory type %d\n", mem_type);
1306                 return ret;
1307         }
1308         man = &bdev->man[mem_type];
1309
1310         if (!man->has_type) {
1311                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1312                        mem_type);
1313                 return ret;
1314         }
1315
1316         man->use_type = false;
1317         man->has_type = false;
1318
1319         ret = 0;
1320         if (mem_type > 0) {
1321                 ttm_bo_force_list_clean(bdev, mem_type, false);
1322
1323                 ret = (*man->func->takedown)(man);
1324         }
1325
1326         return ret;
1327 }
1328 EXPORT_SYMBOL(ttm_bo_clean_mm);
1329
1330 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1331 {
1332         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1333
1334         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1335                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1336                 return -EINVAL;
1337         }
1338
1339         if (!man->has_type) {
1340                 pr_err("Memory type %u has not been initialized\n", mem_type);
1341                 return 0;
1342         }
1343
1344         return ttm_bo_force_list_clean(bdev, mem_type, true);
1345 }
1346 EXPORT_SYMBOL(ttm_bo_evict_mm);
1347
1348 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1349                         unsigned long p_size)
1350 {
1351         int ret = -EINVAL;
1352         struct ttm_mem_type_manager *man;
1353
1354         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1355         man = &bdev->man[type];
1356         BUG_ON(man->has_type);
1357         man->io_reserve_fastpath = true;
1358         man->use_io_reserve_lru = false;
1359         mutex_init(&man->io_reserve_mutex);
1360         INIT_LIST_HEAD(&man->io_reserve_lru);
1361
1362         ret = bdev->driver->init_mem_type(bdev, type, man);
1363         if (ret)
1364                 return ret;
1365         man->bdev = bdev;
1366
1367         ret = 0;
1368         if (type != TTM_PL_SYSTEM) {
1369                 ret = (*man->func->init)(man, p_size);
1370                 if (ret)
1371                         return ret;
1372         }
1373         man->has_type = true;
1374         man->use_type = true;
1375         man->size = p_size;
1376
1377         INIT_LIST_HEAD(&man->lru);
1378
1379         return 0;
1380 }
1381 EXPORT_SYMBOL(ttm_bo_init_mm);
1382
1383 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1384 {
1385         struct ttm_bo_global *glob =
1386                 container_of(kobj, struct ttm_bo_global, kobj);
1387
1388         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1389         __free_page(glob->dummy_read_page);
1390         kfree(glob);
1391 }
1392
1393 void ttm_bo_global_release(struct drm_global_reference *ref)
1394 {
1395         struct ttm_bo_global *glob = ref->object;
1396
1397         kobject_del(&glob->kobj);
1398         kobject_put(&glob->kobj);
1399 }
1400 EXPORT_SYMBOL(ttm_bo_global_release);
1401
1402 int ttm_bo_global_init(struct drm_global_reference *ref)
1403 {
1404         struct ttm_bo_global_ref *bo_ref =
1405                 container_of(ref, struct ttm_bo_global_ref, ref);
1406         struct ttm_bo_global *glob = ref->object;
1407         int ret;
1408
1409         mutex_init(&glob->device_list_mutex);
1410         spin_lock_init(&glob->lru_lock);
1411         glob->mem_glob = bo_ref->mem_glob;
1412         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1413
1414         if (unlikely(glob->dummy_read_page == NULL)) {
1415                 ret = -ENOMEM;
1416                 goto out_no_drp;
1417         }
1418
1419         INIT_LIST_HEAD(&glob->swap_lru);
1420         INIT_LIST_HEAD(&glob->device_list);
1421
1422         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1423         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1424         if (unlikely(ret != 0)) {
1425                 pr_err("Could not register buffer object swapout\n");
1426                 goto out_no_shrink;
1427         }
1428
1429         atomic_set(&glob->bo_count, 0);
1430
1431         ret = kobject_init_and_add(
1432                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1433         if (unlikely(ret != 0))
1434                 kobject_put(&glob->kobj);
1435         return ret;
1436 out_no_shrink:
1437         __free_page(glob->dummy_read_page);
1438 out_no_drp:
1439         kfree(glob);
1440         return ret;
1441 }
1442 EXPORT_SYMBOL(ttm_bo_global_init);
1443
1444
1445 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1446 {
1447         int ret = 0;
1448         unsigned i = TTM_NUM_MEM_TYPES;
1449         struct ttm_mem_type_manager *man;
1450         struct ttm_bo_global *glob = bdev->glob;
1451
1452         while (i--) {
1453                 man = &bdev->man[i];
1454                 if (man->has_type) {
1455                         man->use_type = false;
1456                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1457                                 ret = -EBUSY;
1458                                 pr_err("DRM memory manager type %d is not clean\n",
1459                                        i);
1460                         }
1461                         man->has_type = false;
1462                 }
1463         }
1464
1465         mutex_lock(&glob->device_list_mutex);
1466         list_del(&bdev->device_list);
1467         mutex_unlock(&glob->device_list_mutex);
1468
1469         cancel_delayed_work_sync(&bdev->wq);
1470
1471         while (ttm_bo_delayed_delete(bdev, true))
1472                 ;
1473
1474         spin_lock(&glob->lru_lock);
1475         if (list_empty(&bdev->ddestroy))
1476                 TTM_DEBUG("Delayed destroy list was clean\n");
1477
1478         if (list_empty(&bdev->man[0].lru))
1479                 TTM_DEBUG("Swap list was clean\n");
1480         spin_unlock(&glob->lru_lock);
1481
1482         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1483
1484         return ret;
1485 }
1486 EXPORT_SYMBOL(ttm_bo_device_release);
1487
1488 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1489                        struct ttm_bo_global *glob,
1490                        struct ttm_bo_driver *driver,
1491                        struct address_space *mapping,
1492                        uint64_t file_page_offset,
1493                        bool need_dma32)
1494 {
1495         int ret = -EINVAL;
1496
1497         bdev->driver = driver;
1498
1499         memset(bdev->man, 0, sizeof(bdev->man));
1500
1501         /*
1502          * Initialize the system memory buffer type.
1503          * Other types need to be driver / IOCTL initialized.
1504          */
1505         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1506         if (unlikely(ret != 0))
1507                 goto out_no_sys;
1508
1509         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1510                                     0x10000000);
1511         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1512         INIT_LIST_HEAD(&bdev->ddestroy);
1513         bdev->dev_mapping = mapping;
1514         bdev->glob = glob;
1515         bdev->need_dma32 = need_dma32;
1516         mutex_lock(&glob->device_list_mutex);
1517         list_add_tail(&bdev->device_list, &glob->device_list);
1518         mutex_unlock(&glob->device_list_mutex);
1519
1520         return 0;
1521 out_no_sys:
1522         return ret;
1523 }
1524 EXPORT_SYMBOL(ttm_bo_device_init);
1525
1526 /*
1527  * buffer object vm functions.
1528  */
1529
1530 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1531 {
1532         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1533
1534         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1535                 if (mem->mem_type == TTM_PL_SYSTEM)
1536                         return false;
1537
1538                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1539                         return false;
1540
1541                 if (mem->placement & TTM_PL_FLAG_CACHED)
1542                         return false;
1543         }
1544         return true;
1545 }
1546
1547 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1548 {
1549         struct ttm_bo_device *bdev = bo->bdev;
1550
1551         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1552         ttm_mem_io_free_vm(bo);
1553 }
1554
1555 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1556 {
1557         struct ttm_bo_device *bdev = bo->bdev;
1558         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1559
1560         ttm_mem_io_lock(man, false);
1561         ttm_bo_unmap_virtual_locked(bo);
1562         ttm_mem_io_unlock(man);
1563 }
1564
1565
1566 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1567
1568 int ttm_bo_wait(struct ttm_buffer_object *bo,
1569                 bool interruptible, bool no_wait)
1570 {
1571         struct reservation_object_list *fobj;
1572         struct reservation_object *resv;
1573         struct fence *excl;
1574         long timeout = 15 * HZ;
1575         int i;
1576
1577         resv = bo->resv;
1578         fobj = reservation_object_get_list(resv);
1579         excl = reservation_object_get_excl(resv);
1580         if (excl) {
1581                 if (!fence_is_signaled(excl)) {
1582                         if (no_wait)
1583                                 return -EBUSY;
1584
1585                         timeout = fence_wait_timeout(excl,
1586                                                      interruptible, timeout);
1587                 }
1588         }
1589
1590         for (i = 0; fobj && timeout > 0 && i < fobj->shared_count; ++i) {
1591                 struct fence *fence;
1592                 fence = rcu_dereference_protected(fobj->shared[i],
1593                                                 reservation_object_held(resv));
1594
1595                 if (!fence_is_signaled(fence)) {
1596                         if (no_wait)
1597                                 return -EBUSY;
1598
1599                         timeout = fence_wait_timeout(fence,
1600                                                      interruptible, timeout);
1601                 }
1602         }
1603
1604         if (timeout < 0)
1605                 return timeout;
1606
1607         if (timeout == 0)
1608                 return -EBUSY;
1609
1610         reservation_object_add_excl_fence(resv, NULL);
1611         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1612         return 0;
1613 }
1614 EXPORT_SYMBOL(ttm_bo_wait);
1615
1616 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1617 {
1618         int ret = 0;
1619
1620         /*
1621          * Using ttm_bo_reserve makes sure the lru lists are updated.
1622          */
1623
1624         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1625         if (unlikely(ret != 0))
1626                 return ret;
1627         ret = ttm_bo_wait(bo, true, no_wait);
1628         if (likely(ret == 0))
1629                 atomic_inc(&bo->cpu_writers);
1630         ttm_bo_unreserve(bo);
1631         return ret;
1632 }
1633 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1634
1635 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1636 {
1637         atomic_dec(&bo->cpu_writers);
1638 }
1639 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1640
1641 /**
1642  * A buffer object shrink method that tries to swap out the first
1643  * buffer object on the bo_global::swap_lru list.
1644  */
1645
1646 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1647 {
1648         struct ttm_bo_global *glob =
1649             container_of(shrink, struct ttm_bo_global, shrink);
1650         struct ttm_buffer_object *bo;
1651         int ret = -EBUSY;
1652         int put_count;
1653         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1654
1655         spin_lock(&glob->lru_lock);
1656         list_for_each_entry(bo, &glob->swap_lru, swap) {
1657                 ret = __ttm_bo_reserve(bo, false, true, NULL);
1658                 if (!ret)
1659                         break;
1660         }
1661
1662         if (ret) {
1663                 spin_unlock(&glob->lru_lock);
1664                 return ret;
1665         }
1666
1667         kref_get(&bo->list_kref);
1668
1669         if (!list_empty(&bo->ddestroy)) {
1670                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1671                 kref_put(&bo->list_kref, ttm_bo_release_list);
1672                 return ret;
1673         }
1674
1675         put_count = ttm_bo_del_from_lru(bo);
1676         spin_unlock(&glob->lru_lock);
1677
1678         ttm_bo_list_ref_sub(bo, put_count, true);
1679
1680         /**
1681          * Wait for GPU, then move to system cached.
1682          */
1683
1684         ret = ttm_bo_wait(bo, false, false);
1685
1686         if (unlikely(ret != 0))
1687                 goto out;
1688
1689         if ((bo->mem.placement & swap_placement) != swap_placement) {
1690                 struct ttm_mem_reg evict_mem;
1691
1692                 evict_mem = bo->mem;
1693                 evict_mem.mm_node = NULL;
1694                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1695                 evict_mem.mem_type = TTM_PL_SYSTEM;
1696
1697                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1698                                              false, false);
1699                 if (unlikely(ret != 0))
1700                         goto out;
1701         }
1702
1703         ttm_bo_unmap_virtual(bo);
1704
1705         /**
1706          * Swap out. Buffer will be swapped in again as soon as
1707          * anyone tries to access a ttm page.
1708          */
1709
1710         if (bo->bdev->driver->swap_notify)
1711                 bo->bdev->driver->swap_notify(bo);
1712
1713         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1714 out:
1715
1716         /**
1717          *
1718          * Unreserve without putting on LRU to avoid swapping out an
1719          * already swapped buffer.
1720          */
1721
1722         __ttm_bo_unreserve(bo);
1723         kref_put(&bo->list_kref, ttm_bo_release_list);
1724         return ret;
1725 }
1726
1727 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1728 {
1729         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1730                 ;
1731 }
1732 EXPORT_SYMBOL(ttm_bo_swapout_all);
1733
1734 /**
1735  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1736  * unreserved
1737  *
1738  * @bo: Pointer to buffer
1739  */
1740 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1741 {
1742         int ret;
1743
1744         /*
1745          * In the absense of a wait_unlocked API,
1746          * Use the bo::wu_mutex to avoid triggering livelocks due to
1747          * concurrent use of this function. Note that this use of
1748          * bo::wu_mutex can go away if we change locking order to
1749          * mmap_sem -> bo::reserve.
1750          */
1751         ret = mutex_lock_interruptible(&bo->wu_mutex);
1752         if (unlikely(ret != 0))
1753                 return -ERESTARTSYS;
1754         if (!ww_mutex_is_locked(&bo->resv->lock))
1755                 goto out_unlock;
1756         ret = __ttm_bo_reserve(bo, true, false, NULL);
1757         if (unlikely(ret != 0))
1758                 goto out_unlock;
1759         __ttm_bo_unreserve(bo);
1760
1761 out_unlock:
1762         mutex_unlock(&bo->wu_mutex);
1763         return ret;
1764 }