drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #define pr_fmt(fmt) "[TTM] " fmt
  32
  33 #include <drm/ttm/ttm_module.h>
  34 #include <drm/ttm/ttm_bo_driver.h>
  35 #include <drm/ttm/ttm_placement.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/slab.h>
  38 #include <linux/sched.h>
  39 #include <linux/mm.h>
  40 #include <linux/file.h>
  41 #include <linux/module.h>
  42 #include <linux/atomic.h>
  43 #include <linux/reservation.h>
  44
  45 #define TTM_ASSERT_LOCKED(param)
  46 #define TTM_DEBUG(fmt, arg...)
  47 #define TTM_BO_HASH_ORDER 13
  48
  49 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  50 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  51
  52 static struct attribute ttm_bo_count = {
  53         .name = "bo_count",
  54         .mode = S_IRUGO
  55 };
  56
  57 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
  58                                           uint32_t *mem_type)
  59 {
  60         int pos;
  61
  62         pos = ffs(place->flags & TTM_PL_MASK_MEM);
  63         if (unlikely(!pos))
  64                 return -EINVAL;
  65
  66         *mem_type = pos - 1;
  67         return 0;
  68 }
  69
  70 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  71 {
  72         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  73
  74         pr_err("    has_type: %d\n", man->has_type);
  75         pr_err("    use_type: %d\n", man->use_type);
  76         pr_err("    flags: 0x%08X\n", man->flags);
  77         pr_err("    gpu_offset: 0x%08llX\n", man->gpu_offset);
  78         pr_err("    size: %llu\n", man->size);
  79         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  80         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  81         if (mem_type != TTM_PL_SYSTEM)
  82                 (*man->func->debug)(man, TTM_PFX);
  83 }
  84
  85 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  86                                         struct ttm_placement *placement)
  87 {
  88         int i, ret, mem_type;
  89
  90         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  91                bo, bo->mem.num_pages, bo->mem.size >> 10,
  92                bo->mem.size >> 20);
  93         for (i = 0; i < placement->num_placement; i++) {
  94                 ret = ttm_mem_type_from_place(&placement->placement[i],
  95                                                 &mem_type);
  96                 if (ret)
  97                         return;
  98                 pr_err("  placement[%d]=0x%08X (%d)\n",
  99                        i, placement->placement[i].flags, mem_type);
 100                 ttm_mem_type_debug(bo->bdev, mem_type);
 101         }
 102 }
 103
 104 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 105                                   struct attribute *attr,
 106                                   char *buffer)
 107 {
 108         struct ttm_bo_global *glob =
 109                 container_of(kobj, struct ttm_bo_global, kobj);
 110
 111         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 112                         (unsigned long) atomic_read(&glob->bo_count));
 113 }
 114
 115 static struct attribute *ttm_bo_global_attrs[] = {
 116         &ttm_bo_count,
 117         NULL
 118 };
 119
 120 static const struct sysfs_ops ttm_bo_global_ops = {
 121         .show = &ttm_bo_global_show
 122 };
 123
 124 static struct kobj_type ttm_bo_glob_kobj_type  = {
 125         .release = &ttm_bo_global_kobj_release,
 126         .sysfs_ops = &ttm_bo_global_ops,
 127         .default_attrs = ttm_bo_global_attrs
 128 };
 129
 130
 131 static inline uint32_t ttm_bo_type_flags(unsigned type)
 132 {
 133         return 1 << (type);
 134 }
 135
 136 static void ttm_bo_release_list(struct kref *list_kref)
 137 {
 138         struct ttm_buffer_object *bo =
 139             container_of(list_kref, struct ttm_buffer_object, list_kref);
 140         struct ttm_bo_device *bdev = bo->bdev;
 141         size_t acc_size = bo->acc_size;
 142
 143         BUG_ON(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         ttm_tt_destroy(bo->ttm);
 150         atomic_dec(&bo->glob->bo_count);
 151         fence_put(bo->moving);
 152         if (bo->resv == &bo->ttm_resv)
 153                 reservation_object_fini(&bo->ttm_resv);
 154         mutex_destroy(&bo->wu_mutex);
 155         if (bo->destroy)
 156                 bo->destroy(bo);
 157         else {
 158                 kfree(bo);
 159         }
 160         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 161 }
 162
 163 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 164 {
 165         struct ttm_bo_device *bdev = bo->bdev;
 166
 167         lockdep_assert_held(&bo->resv->lock.base);
 168
 169         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 170
 171                 BUG_ON(!list_empty(&bo->lru));
 172
 173                 list_add(&bo->lru, bdev->driver->lru_tail(bo));
 174                 kref_get(&bo->list_kref);
 175
 176                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 177                         list_add(&bo->swap, bdev->driver->swap_lru_tail(bo));
 178                         kref_get(&bo->list_kref);
 179                 }
 180         }
 181 }
 182 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 183
 184 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 185 {
 186         struct ttm_bo_device *bdev = bo->bdev;
 187         int put_count = 0;
 188
 189         if (bdev->driver->lru_removal)
 190                 bdev->driver->lru_removal(bo);
 191
 192         if (!list_empty(&bo->swap)) {
 193                 list_del_init(&bo->swap);
 194                 ++put_count;
 195         }
 196         if (!list_empty(&bo->lru)) {
 197                 list_del_init(&bo->lru);
 198                 ++put_count;
 199         }
 200
 201         return put_count;
 202 }
 203
 204 static void ttm_bo_ref_bug(struct kref *list_kref)
 205 {
 206         BUG();
 207 }
 208
 209 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 210                          bool never_free)
 211 {
 212         kref_sub(&bo->list_kref, count,
 213                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 214 }
 215
 216 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 217 {
 218         int put_count;
 219
 220         spin_lock(&bo->glob->lru_lock);
 221         put_count = ttm_bo_del_from_lru(bo);
 222         spin_unlock(&bo->glob->lru_lock);
 223         ttm_bo_list_ref_sub(bo, put_count, true);
 224 }
 225 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 226
 227 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 228 {
 229         struct ttm_bo_device *bdev = bo->bdev;
 230         int put_count = 0;
 231
 232         lockdep_assert_held(&bo->resv->lock.base);
 233
 234         if (bdev->driver->lru_removal)
 235                 bdev->driver->lru_removal(bo);
 236
 237         put_count = ttm_bo_del_from_lru(bo);
 238         ttm_bo_list_ref_sub(bo, put_count, true);
 239         ttm_bo_add_to_lru(bo);
 240 }
 241 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 242
 243 struct list_head *ttm_bo_default_lru_tail(struct ttm_buffer_object *bo)
 244 {
 245         return bo->bdev->man[bo->mem.mem_type].lru.prev;
 246 }
 247 EXPORT_SYMBOL(ttm_bo_default_lru_tail);
 248
 249 struct list_head *ttm_bo_default_swap_lru_tail(struct ttm_buffer_object *bo)
 250 {
 251         return bo->glob->swap_lru.prev;
 252 }
 253 EXPORT_SYMBOL(ttm_bo_default_swap_lru_tail);
 254
 255 /*
 256  * Call bo->mutex locked.
 257  */
 258 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 259 {
 260         struct ttm_bo_device *bdev = bo->bdev;
 261         struct ttm_bo_global *glob = bo->glob;
 262         int ret = 0;
 263         uint32_t page_flags = 0;
 264
 265         TTM_ASSERT_LOCKED(&bo->mutex);
 266         bo->ttm = NULL;
 267
 268         if (bdev->need_dma32)
 269                 page_flags |= TTM_PAGE_FLAG_DMA32;
 270
 271         switch (bo->type) {
 272         case ttm_bo_type_device:
 273                 if (zero_alloc)
 274                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 275         case ttm_bo_type_kernel:
 276                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 277                                                       page_flags, glob->dummy_read_page);
 278                 if (unlikely(bo->ttm == NULL))
 279                         ret = -ENOMEM;
 280                 break;
 281         case ttm_bo_type_sg:
 282                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 283                                                       page_flags | TTM_PAGE_FLAG_SG,
 284                                                       glob->dummy_read_page);
 285                 if (unlikely(bo->ttm == NULL)) {
 286                         ret = -ENOMEM;
 287                         break;
 288                 }
 289                 bo->ttm->sg = bo->sg;
 290                 break;
 291         default:
 292                 pr_err("Illegal buffer object type\n");
 293                 ret = -EINVAL;
 294                 break;
 295         }
 296
 297         return ret;
 298 }
 299
 300 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 301                                   struct ttm_mem_reg *mem,
 302                                   bool evict, bool interruptible,
 303                                   bool no_wait_gpu)
 304 {
 305         struct ttm_bo_device *bdev = bo->bdev;
 306         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 307         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 308         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 309         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 310         int ret = 0;
 311
 312         if (old_is_pci || new_is_pci ||
 313             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 314                 ret = ttm_mem_io_lock(old_man, true);
 315                 if (unlikely(ret != 0))
 316                         goto out_err;
 317                 ttm_bo_unmap_virtual_locked(bo);
 318                 ttm_mem_io_unlock(old_man);
 319         }
 320
 321         /*
 322          * Create and bind a ttm if required.
 323          */
 324
 325         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 326                 if (bo->ttm == NULL) {
 327                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 328                         ret = ttm_bo_add_ttm(bo, zero);
 329                         if (ret)
 330                                 goto out_err;
 331                 }
 332
 333                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 334                 if (ret)
 335                         goto out_err;
 336
 337                 if (mem->mem_type != TTM_PL_SYSTEM) {
 338                         ret = ttm_tt_bind(bo->ttm, mem);
 339                         if (ret)
 340                                 goto out_err;
 341                 }
 342
 343                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 344                         if (bdev->driver->move_notify)
 345                                 bdev->driver->move_notify(bo, mem);
 346                         bo->mem = *mem;
 347                         mem->mm_node = NULL;
 348                         goto moved;
 349                 }
 350         }
 351
 352         if (bdev->driver->move_notify)
 353                 bdev->driver->move_notify(bo, mem);
 354
 355         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 356             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 357                 ret = ttm_bo_move_ttm(bo, interruptible, no_wait_gpu, mem);
 358         else if (bdev->driver->move)
 359                 ret = bdev->driver->move(bo, evict, interruptible,
 360                                          no_wait_gpu, mem);
 361         else
 362                 ret = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, mem);
 363
 364         if (ret) {
 365                 if (bdev->driver->move_notify) {
 366                         struct ttm_mem_reg tmp_mem = *mem;
 367                         *mem = bo->mem;
 368                         bo->mem = tmp_mem;
 369                         bdev->driver->move_notify(bo, mem);
 370                         bo->mem = *mem;
 371                         *mem = tmp_mem;
 372                 }
 373
 374                 goto out_err;
 375         }
 376
 377 moved:
 378         if (bo->evicted) {
 379                 if (bdev->driver->invalidate_caches) {
 380                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 381                         if (ret)
 382                                 pr_err("Can not flush read caches\n");
 383                 }
 384                 bo->evicted = false;
 385         }
 386
 387         if (bo->mem.mm_node) {
 388                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 389                     bdev->man[bo->mem.mem_type].gpu_offset;
 390                 bo->cur_placement = bo->mem.placement;
 391         } else
 392                 bo->offset = 0;
 393
 394         return 0;
 395
 396 out_err:
 397         new_man = &bdev->man[bo->mem.mem_type];
 398         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 399                 ttm_tt_destroy(bo->ttm);
 400                 bo->ttm = NULL;
 401         }
 402
 403         return ret;
 404 }
 405
 406 /**
 407  * Call bo::reserved.
 408  * Will release GPU memory type usage on destruction.
 409  * This is the place to put in driver specific hooks to release
 410  * driver private resources.
 411  * Will release the bo::reserved lock.
 412  */
 413
 414 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 415 {
 416         if (bo->bdev->driver->move_notify)
 417                 bo->bdev->driver->move_notify(bo, NULL);
 418
 419         ttm_tt_destroy(bo->ttm);
 420         bo->ttm = NULL;
 421         ttm_bo_mem_put(bo, &bo->mem);
 422
 423         ww_mutex_unlock (&bo->resv->lock);
 424 }
 425
 426 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 427 {
 428         struct reservation_object_list *fobj;
 429         struct fence *fence;
 430         int i;
 431
 432         fobj = reservation_object_get_list(bo->resv);
 433         fence = reservation_object_get_excl(bo->resv);
 434         if (fence && !fence->ops->signaled)
 435                 fence_enable_sw_signaling(fence);
 436
 437         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 438                 fence = rcu_dereference_protected(fobj->shared[i],
 439                                         reservation_object_held(bo->resv));
 440
 441                 if (!fence->ops->signaled)
 442                         fence_enable_sw_signaling(fence);
 443         }
 444 }
 445
 446 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 447 {
 448         struct ttm_bo_device *bdev = bo->bdev;
 449         struct ttm_bo_global *glob = bo->glob;
 450         int put_count;
 451         int ret;
 452
 453         spin_lock(&glob->lru_lock);
 454         ret = __ttm_bo_reserve(bo, false, true, NULL);
 455
 456         if (!ret) {
 457                 if (!ttm_bo_wait(bo, false, true)) {
 458                         put_count = ttm_bo_del_from_lru(bo);
 459
 460                         spin_unlock(&glob->lru_lock);
 461                         ttm_bo_cleanup_memtype_use(bo);
 462
 463                         ttm_bo_list_ref_sub(bo, put_count, true);
 464
 465                         return;
 466                 } else
 467                         ttm_bo_flush_all_fences(bo);
 468
 469                 /*
 470                  * Make NO_EVICT bos immediately available to
 471                  * shrinkers, now that they are queued for
 472                  * destruction.
 473                  */
 474                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 475                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 476                         ttm_bo_add_to_lru(bo);
 477                 }
 478
 479                 __ttm_bo_unreserve(bo);
 480         }
 481
 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         int put_count;
 508         int ret;
 509
 510         ret = ttm_bo_wait(bo, false, true);
 511
 512         if (ret && !no_wait_gpu) {
 513                 long lret;
 514                 ww_mutex_unlock(&bo->resv->lock);
 515                 spin_unlock(&glob->lru_lock);
 516
 517                 lret = reservation_object_wait_timeout_rcu(bo->resv,
 518                                                            true,
 519                                                            interruptible,
 520                                                            30 * HZ);
 521
 522                 if (lret < 0)
 523                         return lret;
 524                 else if (lret == 0)
 525                         return -EBUSY;
 526
 527                 spin_lock(&glob->lru_lock);
 528                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 529
 530                 /*
 531                  * We raced, and lost, someone else holds the reservation now,
 532                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 533                  *
 534                  * Even if it's not the case, because we finished waiting any
 535                  * delayed destruction would succeed, so just return success
 536                  * here.
 537                  */
 538                 if (ret) {
 539                         spin_unlock(&glob->lru_lock);
 540                         return 0;
 541                 }
 542
 543                 /*
 544                  * remove sync_obj with ttm_bo_wait, the wait should be
 545                  * finished, and no new wait object should have been added.
 546                  */
 547                 ret = ttm_bo_wait(bo, false, true);
 548                 WARN_ON(ret);
 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         put_count = ttm_bo_del_from_lru(bo);
 558         list_del_init(&bo->ddestroy);
 559         ++put_count;
 560
 561         spin_unlock(&glob->lru_lock);
 562         ttm_bo_cleanup_memtype_use(bo);
 563
 564         ttm_bo_list_ref_sub(bo, put_count, true);
 565
 566         return 0;
 567 }
 568
 569 /**
 570  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 571  * encountered buffers.
 572  */
 573
 574 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 575 {
 576         struct ttm_bo_global *glob = bdev->glob;
 577         struct ttm_buffer_object *entry = NULL;
 578         int ret = 0;
 579
 580         spin_lock(&glob->lru_lock);
 581         if (list_empty(&bdev->ddestroy))
 582                 goto out_unlock;
 583
 584         entry = list_first_entry(&bdev->ddestroy,
 585                 struct ttm_buffer_object, ddestroy);
 586         kref_get(&entry->list_kref);
 587
 588         for (;;) {
 589                 struct ttm_buffer_object *nentry = NULL;
 590
 591                 if (entry->ddestroy.next != &bdev->ddestroy) {
 592                         nentry = list_first_entry(&entry->ddestroy,
 593                                 struct ttm_buffer_object, ddestroy);
 594                         kref_get(&nentry->list_kref);
 595                 }
 596
 597                 ret = __ttm_bo_reserve(entry, false, true, NULL);
 598                 if (remove_all && ret) {
 599                         spin_unlock(&glob->lru_lock);
 600                         ret = __ttm_bo_reserve(entry, false, false, NULL);
 601                         spin_lock(&glob->lru_lock);
 602                 }
 603
 604                 if (!ret)
 605                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 606                                                              !remove_all);
 607                 else
 608                         spin_unlock(&glob->lru_lock);
 609
 610                 kref_put(&entry->list_kref, ttm_bo_release_list);
 611                 entry = nentry;
 612
 613                 if (ret || !entry)
 614                         goto out;
 615
 616                 spin_lock(&glob->lru_lock);
 617                 if (list_empty(&entry->ddestroy))
 618                         break;
 619         }
 620
 621 out_unlock:
 622         spin_unlock(&glob->lru_lock);
 623 out:
 624         if (entry)
 625                 kref_put(&entry->list_kref, ttm_bo_release_list);
 626         return ret;
 627 }
 628
 629 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 630 {
 631         struct ttm_bo_device *bdev =
 632             container_of(work, struct ttm_bo_device, wq.work);
 633
 634         if (ttm_bo_delayed_delete(bdev, false)) {
 635                 schedule_delayed_work(&bdev->wq,
 636                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 637         }
 638 }
 639
 640 static void ttm_bo_release(struct kref *kref)
 641 {
 642         struct ttm_buffer_object *bo =
 643             container_of(kref, struct ttm_buffer_object, kref);
 644         struct ttm_bo_device *bdev = bo->bdev;
 645         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 646
 647         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 648         ttm_mem_io_lock(man, false);
 649         ttm_mem_io_free_vm(bo);
 650         ttm_mem_io_unlock(man);
 651         ttm_bo_cleanup_refs_or_queue(bo);
 652         kref_put(&bo->list_kref, ttm_bo_release_list);
 653 }
 654
 655 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 656 {
 657         struct ttm_buffer_object *bo = *p_bo;
 658
 659         *p_bo = NULL;
 660         kref_put(&bo->kref, ttm_bo_release);
 661 }
 662 EXPORT_SYMBOL(ttm_bo_unref);
 663
 664 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 665 {
 666         return cancel_delayed_work_sync(&bdev->wq);
 667 }
 668 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 669
 670 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 671 {
 672         if (resched)
 673                 schedule_delayed_work(&bdev->wq,
 674                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 675 }
 676 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 677
 678 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 679                         bool no_wait_gpu)
 680 {
 681         struct ttm_bo_device *bdev = bo->bdev;
 682         struct ttm_mem_reg evict_mem;
 683         struct ttm_placement placement;
 684         int ret = 0;
 685
 686         lockdep_assert_held(&bo->resv->lock.base);
 687
 688         evict_mem = bo->mem;
 689         evict_mem.mm_node = NULL;
 690         evict_mem.bus.io_reserved_vm = false;
 691         evict_mem.bus.io_reserved_count = 0;
 692
 693         placement.num_placement = 0;
 694         placement.num_busy_placement = 0;
 695         bdev->driver->evict_flags(bo, &placement);
 696         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 697                                 no_wait_gpu);
 698         if (ret) {
 699                 if (ret != -ERESTARTSYS) {
 700                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 701                                bo);
 702                         ttm_bo_mem_space_debug(bo, &placement);
 703                 }
 704                 goto out;
 705         }
 706
 707         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 708                                      no_wait_gpu);
 709         if (unlikely(ret)) {
 710                 if (ret != -ERESTARTSYS)
 711                         pr_err("Buffer eviction failed\n");
 712                 ttm_bo_mem_put(bo, &evict_mem);
 713                 goto out;
 714         }
 715         bo->evicted = true;
 716 out:
 717         return ret;
 718 }
 719
 720 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 721                                 uint32_t mem_type,
 722                                 const struct ttm_place *place,
 723                                 bool interruptible,
 724                                 bool no_wait_gpu)
 725 {
 726         struct ttm_bo_global *glob = bdev->glob;
 727         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 728         struct ttm_buffer_object *bo;
 729         int ret = -EBUSY, put_count;
 730
 731         spin_lock(&glob->lru_lock);
 732         list_for_each_entry(bo, &man->lru, lru) {
 733                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 734                 if (!ret) {
 735                         if (place && (place->fpfn || place->lpfn)) {
 736                                 /* Don't evict this BO if it's outside of the
 737                                  * requested placement range
 738                                  */
 739                                 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 740                                     (place->lpfn && place->lpfn <= bo->mem.start)) {
 741                                         __ttm_bo_unreserve(bo);
 742                                         ret = -EBUSY;
 743                                         continue;
 744                                 }
 745                         }
 746
 747                         break;
 748                 }
 749         }
 750
 751         if (ret) {
 752                 spin_unlock(&glob->lru_lock);
 753                 return ret;
 754         }
 755
 756         kref_get(&bo->list_kref);
 757
 758         if (!list_empty(&bo->ddestroy)) {
 759                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 760                                                      no_wait_gpu);
 761                 kref_put(&bo->list_kref, ttm_bo_release_list);
 762                 return ret;
 763         }
 764
 765         put_count = ttm_bo_del_from_lru(bo);
 766         spin_unlock(&glob->lru_lock);
 767
 768         BUG_ON(ret != 0);
 769
 770         ttm_bo_list_ref_sub(bo, put_count, true);
 771
 772         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 773         ttm_bo_unreserve(bo);
 774
 775         kref_put(&bo->list_kref, ttm_bo_release_list);
 776         return ret;
 777 }
 778
 779 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 780 {
 781         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 782
 783         if (mem->mm_node)
 784                 (*man->func->put_node)(man, mem);
 785 }
 786 EXPORT_SYMBOL(ttm_bo_mem_put);
 787
 788 /**
 789  * Add the last move fence to the BO and reserve a new shared slot.
 790  */
 791 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 792                                  struct ttm_mem_type_manager *man,
 793                                  struct ttm_mem_reg *mem)
 794 {
 795         struct fence *fence;
 796         int ret;
 797
 798         spin_lock(&man->move_lock);
 799         fence = fence_get(man->move);
 800         spin_unlock(&man->move_lock);
 801
 802         if (fence) {
 803                 reservation_object_add_shared_fence(bo->resv, fence);
 804
 805                 ret = reservation_object_reserve_shared(bo->resv);
 806                 if (unlikely(ret))
 807                         return ret;
 808
 809                 fence_put(bo->moving);
 810                 bo->moving = fence;
 811         }
 812
 813         return 0;
 814 }
 815
 816 /**
 817  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 818  * space, or we've evicted everything and there isn't enough space.
 819  */
 820 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 821                                         uint32_t mem_type,
 822                                         const struct ttm_place *place,
 823                                         struct ttm_mem_reg *mem,
 824                                         bool interruptible,
 825                                         bool no_wait_gpu)
 826 {
 827         struct ttm_bo_device *bdev = bo->bdev;
 828         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 829         int ret;
 830
 831         do {
 832                 ret = (*man->func->get_node)(man, bo, place, mem);
 833                 if (unlikely(ret != 0))
 834                         return ret;
 835                 if (mem->mm_node)
 836                         break;
 837                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 838                                           interruptible, no_wait_gpu);
 839                 if (unlikely(ret != 0))
 840                         return ret;
 841         } while (1);
 842         mem->mem_type = mem_type;
 843         return ttm_bo_add_move_fence(bo, man, mem);
 844 }
 845
 846 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 847                                       uint32_t cur_placement,
 848                                       uint32_t proposed_placement)
 849 {
 850         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 851         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 852
 853         /**
 854          * Keep current caching if possible.
 855          */
 856
 857         if ((cur_placement & caching) != 0)
 858                 result |= (cur_placement & caching);
 859         else if ((man->default_caching & caching) != 0)
 860                 result |= man->default_caching;
 861         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 862                 result |= TTM_PL_FLAG_CACHED;
 863         else if ((TTM_PL_FLAG_WC & caching) != 0)
 864                 result |= TTM_PL_FLAG_WC;
 865         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 866                 result |= TTM_PL_FLAG_UNCACHED;
 867
 868         return result;
 869 }
 870
 871 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 872                                  uint32_t mem_type,
 873                                  const struct ttm_place *place,
 874                                  uint32_t *masked_placement)
 875 {
 876         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 877
 878         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 879                 return false;
 880
 881         if ((place->flags & man->available_caching) == 0)
 882                 return false;
 883
 884         cur_flags |= (place->flags & man->available_caching);
 885
 886         *masked_placement = cur_flags;
 887         return true;
 888 }
 889
 890 /**
 891  * Creates space for memory region @mem according to its type.
 892  *
 893  * This function first searches for free space in compatible memory types in
 894  * the priority order defined by the driver.  If free space isn't found, then
 895  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 896  * space.
 897  */
 898 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 899                         struct ttm_placement *placement,
 900                         struct ttm_mem_reg *mem,
 901                         bool interruptible,
 902                         bool no_wait_gpu)
 903 {
 904         struct ttm_bo_device *bdev = bo->bdev;
 905         struct ttm_mem_type_manager *man;
 906         uint32_t mem_type = TTM_PL_SYSTEM;
 907         uint32_t cur_flags = 0;
 908         bool type_found = false;
 909         bool type_ok = false;
 910         bool has_erestartsys = false;
 911         int i, ret;
 912
 913         ret = reservation_object_reserve_shared(bo->resv);
 914         if (unlikely(ret))
 915                 return ret;
 916
 917         mem->mm_node = NULL;
 918         for (i = 0; i < placement->num_placement; ++i) {
 919                 const struct ttm_place *place = &placement->placement[i];
 920
 921                 ret = ttm_mem_type_from_place(place, &mem_type);
 922                 if (ret)
 923                         return ret;
 924                 man = &bdev->man[mem_type];
 925                 if (!man->has_type || !man->use_type)
 926                         continue;
 927
 928                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 929                                                 &cur_flags);
 930
 931                 if (!type_ok)
 932                         continue;
 933
 934                 type_found = true;
 935                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 936                                                   cur_flags);
 937                 /*
 938                  * Use the access and other non-mapping-related flag bits from
 939                  * the memory placement flags to the current flags
 940                  */
 941                 ttm_flag_masked(&cur_flags, place->flags,
 942                                 ~TTM_PL_MASK_MEMTYPE);
 943
 944                 if (mem_type == TTM_PL_SYSTEM)
 945                         break;
 946
 947                 ret = (*man->func->get_node)(man, bo, place, mem);
 948                 if (unlikely(ret))
 949                         return ret;
 950
 951                 if (mem->mm_node) {
 952                         ret = ttm_bo_add_move_fence(bo, man, mem);
 953                         if (unlikely(ret)) {
 954                                 (*man->func->put_node)(man, mem);
 955                                 return ret;
 956                         }
 957                         break;
 958                 }
 959         }
 960
 961         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 962                 mem->mem_type = mem_type;
 963                 mem->placement = cur_flags;
 964                 return 0;
 965         }
 966
 967         for (i = 0; i < placement->num_busy_placement; ++i) {
 968                 const struct ttm_place *place = &placement->busy_placement[i];
 969
 970                 ret = ttm_mem_type_from_place(place, &mem_type);
 971                 if (ret)
 972                         return ret;
 973                 man = &bdev->man[mem_type];
 974                 if (!man->has_type || !man->use_type)
 975                         continue;
 976                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 977                         continue;
 978
 979                 type_found = true;
 980                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 981                                                   cur_flags);
 982                 /*
 983                  * Use the access and other non-mapping-related flag bits from
 984                  * the memory placement flags to the current flags
 985                  */
 986                 ttm_flag_masked(&cur_flags, place->flags,
 987                                 ~TTM_PL_MASK_MEMTYPE);
 988
 989                 if (mem_type == TTM_PL_SYSTEM) {
 990                         mem->mem_type = mem_type;
 991                         mem->placement = cur_flags;
 992                         mem->mm_node = NULL;
 993                         return 0;
 994                 }
 995
 996                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
 997                                                 interruptible, no_wait_gpu);
 998                 if (ret == 0 && mem->mm_node) {
 999                         mem->placement = cur_flags;
1000                         return 0;
1001                 }
1002                 if (ret == -ERESTARTSYS)
1003                         has_erestartsys = true;
1004         }
1005
1006         if (!type_found) {
1007                 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
1008                 return -EINVAL;
1009         }
1010
1011         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1012 }
1013 EXPORT_SYMBOL(ttm_bo_mem_space);
1014
1015 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1016                         struct ttm_placement *placement,
1017                         bool interruptible,
1018                         bool no_wait_gpu)
1019 {
1020         int ret = 0;
1021         struct ttm_mem_reg mem;
1022
1023         lockdep_assert_held(&bo->resv->lock.base);
1024
1025         mem.num_pages = bo->num_pages;
1026         mem.size = mem.num_pages << PAGE_SHIFT;
1027         mem.page_alignment = bo->mem.page_alignment;
1028         mem.bus.io_reserved_vm = false;
1029         mem.bus.io_reserved_count = 0;
1030         /*
1031          * Determine where to move the buffer.
1032          */
1033         ret = ttm_bo_mem_space(bo, placement, &mem,
1034                                interruptible, no_wait_gpu);
1035         if (ret)
1036                 goto out_unlock;
1037         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1038                                      interruptible, no_wait_gpu);
1039 out_unlock:
1040         if (ret && mem.mm_node)
1041                 ttm_bo_mem_put(bo, &mem);
1042         return ret;
1043 }
1044
1045 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1046                        struct ttm_mem_reg *mem,
1047                        uint32_t *new_flags)
1048 {
1049         int i;
1050
1051         for (i = 0; i < placement->num_placement; i++) {
1052                 const struct ttm_place *heap = &placement->placement[i];
1053                 if (mem->mm_node &&
1054                     (mem->start < heap->fpfn ||
1055                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1056                         continue;
1057
1058                 *new_flags = heap->flags;
1059                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1060                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1061                         return true;
1062         }
1063
1064         for (i = 0; i < placement->num_busy_placement; i++) {
1065                 const struct ttm_place *heap = &placement->busy_placement[i];
1066                 if (mem->mm_node &&
1067                     (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                         return true;
1075         }
1076
1077         return false;
1078 }
1079 EXPORT_SYMBOL(ttm_bo_mem_compat);
1080
1081 int ttm_bo_validate(struct ttm_buffer_object *bo,
1082                         struct ttm_placement *placement,
1083                         bool interruptible,
1084                         bool no_wait_gpu)
1085 {
1086         int ret;
1087         uint32_t new_flags;
1088
1089         lockdep_assert_held(&bo->resv->lock.base);
1090         /*
1091          * Check whether we need to move buffer.
1092          */
1093         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1094                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1095                                          no_wait_gpu);
1096                 if (ret)
1097                         return ret;
1098         } else {
1099                 /*
1100                  * Use the access and other non-mapping-related flag bits from
1101                  * the compatible memory placement flags to the active flags
1102                  */
1103                 ttm_flag_masked(&bo->mem.placement, new_flags,
1104                                 ~TTM_PL_MASK_MEMTYPE);
1105         }
1106         /*
1107          * We might need to add a TTM.
1108          */
1109         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1110                 ret = ttm_bo_add_ttm(bo, true);
1111                 if (ret)
1112                         return ret;
1113         }
1114         return 0;
1115 }
1116 EXPORT_SYMBOL(ttm_bo_validate);
1117
1118 int ttm_bo_init(struct ttm_bo_device *bdev,
1119                 struct ttm_buffer_object *bo,
1120                 unsigned long size,
1121                 enum ttm_bo_type type,
1122                 struct ttm_placement *placement,
1123                 uint32_t page_alignment,
1124                 bool interruptible,
1125                 struct file *persistent_swap_storage,
1126                 size_t acc_size,
1127                 struct sg_table *sg,
1128                 struct reservation_object *resv,
1129                 void (*destroy) (struct ttm_buffer_object *))
1130 {
1131         int ret = 0;
1132         unsigned long num_pages;
1133         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1134         bool locked;
1135
1136         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1137         if (ret) {
1138                 pr_err("Out of kernel memory\n");
1139                 if (destroy)
1140                         (*destroy)(bo);
1141                 else
1142                         kfree(bo);
1143                 return -ENOMEM;
1144         }
1145
1146         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1147         if (num_pages == 0) {
1148                 pr_err("Illegal buffer object size\n");
1149                 if (destroy)
1150                         (*destroy)(bo);
1151                 else
1152                         kfree(bo);
1153                 ttm_mem_global_free(mem_glob, acc_size);
1154                 return -EINVAL;
1155         }
1156         bo->destroy = destroy;
1157
1158         kref_init(&bo->kref);
1159         kref_init(&bo->list_kref);
1160         atomic_set(&bo->cpu_writers, 0);
1161         INIT_LIST_HEAD(&bo->lru);
1162         INIT_LIST_HEAD(&bo->ddestroy);
1163         INIT_LIST_HEAD(&bo->swap);
1164         INIT_LIST_HEAD(&bo->io_reserve_lru);
1165         mutex_init(&bo->wu_mutex);
1166         bo->bdev = bdev;
1167         bo->glob = bdev->glob;
1168         bo->type = type;
1169         bo->num_pages = num_pages;
1170         bo->mem.size = num_pages << PAGE_SHIFT;
1171         bo->mem.mem_type = TTM_PL_SYSTEM;
1172         bo->mem.num_pages = bo->num_pages;
1173         bo->mem.mm_node = NULL;
1174         bo->mem.page_alignment = page_alignment;
1175         bo->mem.bus.io_reserved_vm = false;
1176         bo->mem.bus.io_reserved_count = 0;
1177         bo->moving = NULL;
1178         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1179         bo->persistent_swap_storage = persistent_swap_storage;
1180         bo->acc_size = acc_size;
1181         bo->sg = sg;
1182         if (resv) {
1183                 bo->resv = resv;
1184                 lockdep_assert_held(&bo->resv->lock.base);
1185         } else {
1186                 bo->resv = &bo->ttm_resv;
1187                 reservation_object_init(&bo->ttm_resv);
1188         }
1189         atomic_inc(&bo->glob->bo_count);
1190         drm_vma_node_reset(&bo->vma_node);
1191
1192         /*
1193          * For ttm_bo_type_device buffers, allocate
1194          * address space from the device.
1195          */
1196         if (bo->type == ttm_bo_type_device ||
1197             bo->type == ttm_bo_type_sg)
1198                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1199                                          bo->mem.num_pages);
1200
1201         /* passed reservation objects should already be locked,
1202          * since otherwise lockdep will be angered in radeon.
1203          */
1204         if (!resv) {
1205                 locked = ww_mutex_trylock(&bo->resv->lock);
1206                 WARN_ON(!locked);
1207         }
1208
1209         if (likely(!ret))
1210                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1211
1212         if (!resv) {
1213                 ttm_bo_unreserve(bo);
1214
1215         } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1216                 spin_lock(&bo->glob->lru_lock);
1217                 ttm_bo_add_to_lru(bo);
1218                 spin_unlock(&bo->glob->lru_lock);
1219         }
1220
1221         if (unlikely(ret))
1222                 ttm_bo_unref(&bo);
1223
1224         return ret;
1225 }
1226 EXPORT_SYMBOL(ttm_bo_init);
1227
1228 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1229                        unsigned long bo_size,
1230                        unsigned struct_size)
1231 {
1232         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1233         size_t size = 0;
1234
1235         size += ttm_round_pot(struct_size);
1236         size += ttm_round_pot(npages * sizeof(void *));
1237         size += ttm_round_pot(sizeof(struct ttm_tt));
1238         return size;
1239 }
1240 EXPORT_SYMBOL(ttm_bo_acc_size);
1241
1242 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1243                            unsigned long bo_size,
1244                            unsigned struct_size)
1245 {
1246         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1247         size_t size = 0;
1248
1249         size += ttm_round_pot(struct_size);
1250         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1251         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1252         return size;
1253 }
1254 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1255
1256 int ttm_bo_create(struct ttm_bo_device *bdev,
1257                         unsigned long size,
1258                         enum ttm_bo_type type,
1259                         struct ttm_placement *placement,
1260                         uint32_t page_alignment,
1261                         bool interruptible,
1262                         struct file *persistent_swap_storage,
1263                         struct ttm_buffer_object **p_bo)
1264 {
1265         struct ttm_buffer_object *bo;
1266         size_t acc_size;
1267         int ret;
1268
1269         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1270         if (unlikely(bo == NULL))
1271                 return -ENOMEM;
1272
1273         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1274         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1275                           interruptible, persistent_swap_storage, acc_size,
1276                           NULL, NULL, NULL);
1277         if (likely(ret == 0))
1278                 *p_bo = bo;
1279
1280         return ret;
1281 }
1282 EXPORT_SYMBOL(ttm_bo_create);
1283
1284 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1285                                         unsigned mem_type, bool allow_errors)
1286 {
1287         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1288         struct ttm_bo_global *glob = bdev->glob;
1289         struct fence *fence;
1290         int ret;
1291
1292         /*
1293          * Can't use standard list traversal since we're unlocking.
1294          */
1295
1296         spin_lock(&glob->lru_lock);
1297         while (!list_empty(&man->lru)) {
1298                 spin_unlock(&glob->lru_lock);
1299                 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1300                 if (ret) {
1301                         if (allow_errors) {
1302                                 return ret;
1303                         } else {
1304                                 pr_err("Cleanup eviction failed\n");
1305                         }
1306                 }
1307                 spin_lock(&glob->lru_lock);
1308         }
1309         spin_unlock(&glob->lru_lock);
1310
1311         spin_lock(&man->move_lock);
1312         fence = fence_get(man->move);
1313         spin_unlock(&man->move_lock);
1314
1315         if (fence) {
1316                 ret = fence_wait(fence, false);
1317                 fence_put(fence);
1318                 if (ret) {
1319                         if (allow_errors) {
1320                                 return ret;
1321                         } else {
1322                                 pr_err("Cleanup eviction failed\n");
1323                         }
1324                 }
1325         }
1326
1327         return 0;
1328 }
1329
1330 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1331 {
1332         struct ttm_mem_type_manager *man;
1333         int ret = -EINVAL;
1334
1335         if (mem_type >= TTM_NUM_MEM_TYPES) {
1336                 pr_err("Illegal memory type %d\n", mem_type);
1337                 return ret;
1338         }
1339         man = &bdev->man[mem_type];
1340
1341         if (!man->has_type) {
1342                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1343                        mem_type);
1344                 return ret;
1345         }
1346         fence_put(man->move);
1347
1348         man->use_type = false;
1349         man->has_type = false;
1350
1351         ret = 0;
1352         if (mem_type > 0) {
1353                 ttm_bo_force_list_clean(bdev, mem_type, false);
1354
1355                 ret = (*man->func->takedown)(man);
1356         }
1357
1358         return ret;
1359 }
1360 EXPORT_SYMBOL(ttm_bo_clean_mm);
1361
1362 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1363 {
1364         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1365
1366         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1367                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1368                 return -EINVAL;
1369         }
1370
1371         if (!man->has_type) {
1372                 pr_err("Memory type %u has not been initialized\n", mem_type);
1373                 return 0;
1374         }
1375
1376         return ttm_bo_force_list_clean(bdev, mem_type, true);
1377 }
1378 EXPORT_SYMBOL(ttm_bo_evict_mm);
1379
1380 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1381                         unsigned long p_size)
1382 {
1383         int ret = -EINVAL;
1384         struct ttm_mem_type_manager *man;
1385
1386         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1387         man = &bdev->man[type];
1388         BUG_ON(man->has_type);
1389         man->io_reserve_fastpath = true;
1390         man->use_io_reserve_lru = false;
1391         mutex_init(&man->io_reserve_mutex);
1392         spin_lock_init(&man->move_lock);
1393         INIT_LIST_HEAD(&man->io_reserve_lru);
1394
1395         ret = bdev->driver->init_mem_type(bdev, type, man);
1396         if (ret)
1397                 return ret;
1398         man->bdev = bdev;
1399
1400         ret = 0;
1401         if (type != TTM_PL_SYSTEM) {
1402                 ret = (*man->func->init)(man, p_size);
1403                 if (ret)
1404                         return ret;
1405         }
1406         man->has_type = true;
1407         man->use_type = true;
1408         man->size = p_size;
1409
1410         INIT_LIST_HEAD(&man->lru);
1411         man->move = NULL;
1412
1413         return 0;
1414 }
1415 EXPORT_SYMBOL(ttm_bo_init_mm);
1416
1417 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1418 {
1419         struct ttm_bo_global *glob =
1420                 container_of(kobj, struct ttm_bo_global, kobj);
1421
1422         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1423         __free_page(glob->dummy_read_page);
1424         kfree(glob);
1425 }
1426
1427 void ttm_bo_global_release(struct drm_global_reference *ref)
1428 {
1429         struct ttm_bo_global *glob = ref->object;
1430
1431         kobject_del(&glob->kobj);
1432         kobject_put(&glob->kobj);
1433 }
1434 EXPORT_SYMBOL(ttm_bo_global_release);
1435
1436 int ttm_bo_global_init(struct drm_global_reference *ref)
1437 {
1438         struct ttm_bo_global_ref *bo_ref =
1439                 container_of(ref, struct ttm_bo_global_ref, ref);
1440         struct ttm_bo_global *glob = ref->object;
1441         int ret;
1442
1443         mutex_init(&glob->device_list_mutex);
1444         spin_lock_init(&glob->lru_lock);
1445         glob->mem_glob = bo_ref->mem_glob;
1446         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1447
1448         if (unlikely(glob->dummy_read_page == NULL)) {
1449                 ret = -ENOMEM;
1450                 goto out_no_drp;
1451         }
1452
1453         INIT_LIST_HEAD(&glob->swap_lru);
1454         INIT_LIST_HEAD(&glob->device_list);
1455
1456         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1457         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1458         if (unlikely(ret != 0)) {
1459                 pr_err("Could not register buffer object swapout\n");
1460                 goto out_no_shrink;
1461         }
1462
1463         atomic_set(&glob->bo_count, 0);
1464
1465         ret = kobject_init_and_add(
1466                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1467         if (unlikely(ret != 0))
1468                 kobject_put(&glob->kobj);
1469         return ret;
1470 out_no_shrink:
1471         __free_page(glob->dummy_read_page);
1472 out_no_drp:
1473         kfree(glob);
1474         return ret;
1475 }
1476 EXPORT_SYMBOL(ttm_bo_global_init);
1477
1478
1479 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1480 {
1481         int ret = 0;
1482         unsigned i = TTM_NUM_MEM_TYPES;
1483         struct ttm_mem_type_manager *man;
1484         struct ttm_bo_global *glob = bdev->glob;
1485
1486         while (i--) {
1487                 man = &bdev->man[i];
1488                 if (man->has_type) {
1489                         man->use_type = false;
1490                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1491                                 ret = -EBUSY;
1492                                 pr_err("DRM memory manager type %d is not clean\n",
1493                                        i);
1494                         }
1495                         man->has_type = false;
1496                 }
1497         }
1498
1499         mutex_lock(&glob->device_list_mutex);
1500         list_del(&bdev->device_list);
1501         mutex_unlock(&glob->device_list_mutex);
1502
1503         cancel_delayed_work_sync(&bdev->wq);
1504
1505         while (ttm_bo_delayed_delete(bdev, true))
1506                 ;
1507
1508         spin_lock(&glob->lru_lock);
1509         if (list_empty(&bdev->ddestroy))
1510                 TTM_DEBUG("Delayed destroy list was clean\n");
1511
1512         if (list_empty(&bdev->man[0].lru))
1513                 TTM_DEBUG("Swap list was clean\n");
1514         spin_unlock(&glob->lru_lock);
1515
1516         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1517
1518         return ret;
1519 }
1520 EXPORT_SYMBOL(ttm_bo_device_release);
1521
1522 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1523                        struct ttm_bo_global *glob,
1524                        struct ttm_bo_driver *driver,
1525                        struct address_space *mapping,
1526                        uint64_t file_page_offset,
1527                        bool need_dma32)
1528 {
1529         int ret = -EINVAL;
1530
1531         bdev->driver = driver;
1532
1533         memset(bdev->man, 0, sizeof(bdev->man));
1534
1535         /*
1536          * Initialize the system memory buffer type.
1537          * Other types need to be driver / IOCTL initialized.
1538          */
1539         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1540         if (unlikely(ret != 0))
1541                 goto out_no_sys;
1542
1543         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1544                                     0x10000000);
1545         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1546         INIT_LIST_HEAD(&bdev->ddestroy);
1547         bdev->dev_mapping = mapping;
1548         bdev->glob = glob;
1549         bdev->need_dma32 = need_dma32;
1550         mutex_lock(&glob->device_list_mutex);
1551         list_add_tail(&bdev->device_list, &glob->device_list);
1552         mutex_unlock(&glob->device_list_mutex);
1553
1554         return 0;
1555 out_no_sys:
1556         return ret;
1557 }
1558 EXPORT_SYMBOL(ttm_bo_device_init);
1559
1560 /*
1561  * buffer object vm functions.
1562  */
1563
1564 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1565 {
1566         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1567
1568         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1569                 if (mem->mem_type == TTM_PL_SYSTEM)
1570                         return false;
1571
1572                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1573                         return false;
1574
1575                 if (mem->placement & TTM_PL_FLAG_CACHED)
1576                         return false;
1577         }
1578         return true;
1579 }
1580
1581 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1582 {
1583         struct ttm_bo_device *bdev = bo->bdev;
1584
1585         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1586         ttm_mem_io_free_vm(bo);
1587 }
1588
1589 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1590 {
1591         struct ttm_bo_device *bdev = bo->bdev;
1592         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1593
1594         ttm_mem_io_lock(man, false);
1595         ttm_bo_unmap_virtual_locked(bo);
1596         ttm_mem_io_unlock(man);
1597 }
1598
1599
1600 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1601
1602 int ttm_bo_wait(struct ttm_buffer_object *bo,
1603                 bool interruptible, bool no_wait)
1604 {
1605         long timeout = no_wait ? 0 : 15 * HZ;
1606
1607         timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1608                                                       interruptible, timeout);
1609         if (timeout < 0)
1610                 return timeout;
1611
1612         if (timeout == 0)
1613                 return -EBUSY;
1614
1615         reservation_object_add_excl_fence(bo->resv, NULL);
1616         return 0;
1617 }
1618 EXPORT_SYMBOL(ttm_bo_wait);
1619
1620 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1621 {
1622         int ret = 0;
1623
1624         /*
1625          * Using ttm_bo_reserve makes sure the lru lists are updated.
1626          */
1627
1628         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1629         if (unlikely(ret != 0))
1630                 return ret;
1631         ret = ttm_bo_wait(bo, true, no_wait);
1632         if (likely(ret == 0))
1633                 atomic_inc(&bo->cpu_writers);
1634         ttm_bo_unreserve(bo);
1635         return ret;
1636 }
1637 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1638
1639 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1640 {
1641         atomic_dec(&bo->cpu_writers);
1642 }
1643 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1644
1645 /**
1646  * A buffer object shrink method that tries to swap out the first
1647  * buffer object on the bo_global::swap_lru list.
1648  */
1649
1650 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1651 {
1652         struct ttm_bo_global *glob =
1653             container_of(shrink, struct ttm_bo_global, shrink);
1654         struct ttm_buffer_object *bo;
1655         int ret = -EBUSY;
1656         int put_count;
1657         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1658
1659         spin_lock(&glob->lru_lock);
1660         list_for_each_entry(bo, &glob->swap_lru, swap) {
1661                 ret = __ttm_bo_reserve(bo, false, true, NULL);
1662                 if (!ret)
1663                         break;
1664         }
1665
1666         if (ret) {
1667                 spin_unlock(&glob->lru_lock);
1668                 return ret;
1669         }
1670
1671         kref_get(&bo->list_kref);
1672
1673         if (!list_empty(&bo->ddestroy)) {
1674                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1675                 kref_put(&bo->list_kref, ttm_bo_release_list);
1676                 return ret;
1677         }
1678
1679         put_count = ttm_bo_del_from_lru(bo);
1680         spin_unlock(&glob->lru_lock);
1681
1682         ttm_bo_list_ref_sub(bo, put_count, true);
1683
1684         /**
1685          * Move to system cached
1686          */
1687
1688         if ((bo->mem.placement & swap_placement) != swap_placement) {
1689                 struct ttm_mem_reg evict_mem;
1690
1691                 evict_mem = bo->mem;
1692                 evict_mem.mm_node = NULL;
1693                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1694                 evict_mem.mem_type = TTM_PL_SYSTEM;
1695
1696                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1697                                              false, false);
1698                 if (unlikely(ret != 0))
1699                         goto out;
1700         }
1701
1702         /**
1703          * Make sure BO is idle.
1704          */
1705
1706         ret = ttm_bo_wait(bo, false, false);
1707         if (unlikely(ret != 0))
1708                 goto out;
1709
1710         ttm_bo_unmap_virtual(bo);
1711
1712         /**
1713          * Swap out. Buffer will be swapped in again as soon as
1714          * anyone tries to access a ttm page.
1715          */
1716
1717         if (bo->bdev->driver->swap_notify)
1718                 bo->bdev->driver->swap_notify(bo);
1719
1720         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1721 out:
1722
1723         /**
1724          *
1725          * Unreserve without putting on LRU to avoid swapping out an
1726          * already swapped buffer.
1727          */
1728
1729         __ttm_bo_unreserve(bo);
1730         kref_put(&bo->list_kref, ttm_bo_release_list);
1731         return ret;
1732 }
1733
1734 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1735 {
1736         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1737                 ;
1738 }
1739 EXPORT_SYMBOL(ttm_bo_swapout_all);
1740
1741 /**
1742  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1743  * unreserved
1744  *
1745  * @bo: Pointer to buffer
1746  */
1747 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1748 {
1749         int ret;
1750
1751         /*
1752          * In the absense of a wait_unlocked API,
1753          * Use the bo::wu_mutex to avoid triggering livelocks due to
1754          * concurrent use of this function. Note that this use of
1755          * bo::wu_mutex can go away if we change locking order to
1756          * mmap_sem -> bo::reserve.
1757          */
1758         ret = mutex_lock_interruptible(&bo->wu_mutex);
1759         if (unlikely(ret != 0))
1760                 return -ERESTARTSYS;
1761         if (!ww_mutex_is_locked(&bo->resv->lock))
1762                 goto out_unlock;
1763         ret = __ttm_bo_reserve(bo, true, false, NULL);
1764         if (unlikely(ret != 0))
1765                 goto out_unlock;
1766         __ttm_bo_unreserve(bo);
1767
1768 out_unlock:
1769         mutex_unlock(&bo->wu_mutex);
1770         return ret;
1771 }