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