drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #define pr_fmt(fmt) "[TTM] " fmt
  32
  33 #include <drm/ttm/ttm_module.h>
  34 #include <drm/ttm/ttm_bo_driver.h>
  35 #include <drm/ttm/ttm_placement.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/slab.h>
  38 #include <linux/sched.h>
  39 #include <linux/mm.h>
  40 #include <linux/file.h>
  41 #include <linux/module.h>
  42 #include <linux/atomic.h>
  43 #include <linux/reservation.h>
  44
  45 #define TTM_ASSERT_LOCKED(param)
  46 #define TTM_DEBUG(fmt, arg...)
  47 #define TTM_BO_HASH_ORDER 13
  48
  49 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  50 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  51
  52 static struct attribute ttm_bo_count = {
  53         .name = "bo_count",
  54         .mode = S_IRUGO
  55 };
  56
  57 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
  58                                           uint32_t *mem_type)
  59 {
  60         int i;
  61
  62         for (i = 0; i <= TTM_PL_PRIV5; i++)
  63                 if (place->flags & (1 << i)) {
  64                         *mem_type = i;
  65                         return 0;
  66                 }
  67         return -EINVAL;
  68 }
  69
  70 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  71 {
  72         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  73
  74         pr_err("    has_type: %d\n", man->has_type);
  75         pr_err("    use_type: %d\n", man->use_type);
  76         pr_err("    flags: 0x%08X\n", man->flags);
  77         pr_err("    gpu_offset: 0x%08llX\n", man->gpu_offset);
  78         pr_err("    size: %llu\n", man->size);
  79         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  80         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  81         if (mem_type != TTM_PL_SYSTEM)
  82                 (*man->func->debug)(man, TTM_PFX);
  83 }
  84
  85 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  86                                         struct ttm_placement *placement)
  87 {
  88         int i, ret, mem_type;
  89
  90         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  91                bo, bo->mem.num_pages, bo->mem.size >> 10,
  92                bo->mem.size >> 20);
  93         for (i = 0; i < placement->num_placement; i++) {
  94                 ret = ttm_mem_type_from_place(&placement->placement[i],
  95                                                 &mem_type);
  96                 if (ret)
  97                         return;
  98                 pr_err("  placement[%d]=0x%08X (%d)\n",
  99                        i, placement->placement[i].flags, mem_type);
 100                 ttm_mem_type_debug(bo->bdev, mem_type);
 101         }
 102 }
 103
 104 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 105                                   struct attribute *attr,
 106                                   char *buffer)
 107 {
 108         struct ttm_bo_global *glob =
 109                 container_of(kobj, struct ttm_bo_global, kobj);
 110
 111         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 112                         (unsigned long) atomic_read(&glob->bo_count));
 113 }
 114
 115 static struct attribute *ttm_bo_global_attrs[] = {
 116         &ttm_bo_count,
 117         NULL
 118 };
 119
 120 static const struct sysfs_ops ttm_bo_global_ops = {
 121         .show = &ttm_bo_global_show
 122 };
 123
 124 static struct kobj_type ttm_bo_glob_kobj_type  = {
 125         .release = &ttm_bo_global_kobj_release,
 126         .sysfs_ops = &ttm_bo_global_ops,
 127         .default_attrs = ttm_bo_global_attrs
 128 };
 129
 130
 131 static inline uint32_t ttm_bo_type_flags(unsigned type)
 132 {
 133         return 1 << (type);
 134 }
 135
 136 static void ttm_bo_release_list(struct kref *list_kref)
 137 {
 138         struct ttm_buffer_object *bo =
 139             container_of(list_kref, struct ttm_buffer_object, list_kref);
 140         struct ttm_bo_device *bdev = bo->bdev;
 141         size_t acc_size = bo->acc_size;
 142
 143         BUG_ON(atomic_read(&bo->list_kref.refcount));
 144         BUG_ON(atomic_read(&bo->kref.refcount));
 145         BUG_ON(atomic_read(&bo->cpu_writers));
 146         BUG_ON(bo->mem.mm_node != NULL);
 147         BUG_ON(!list_empty(&bo->lru));
 148         BUG_ON(!list_empty(&bo->ddestroy));
 149
 150         if (bo->ttm)
 151                 ttm_tt_destroy(bo->ttm);
 152         atomic_dec(&bo->glob->bo_count);
 153         if (bo->resv == &bo->ttm_resv)
 154                 reservation_object_fini(&bo->ttm_resv);
 155         mutex_destroy(&bo->wu_mutex);
 156         if (bo->destroy)
 157                 bo->destroy(bo);
 158         else {
 159                 kfree(bo);
 160         }
 161         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 162 }
 163
 164 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 165 {
 166         struct ttm_bo_device *bdev = bo->bdev;
 167         struct ttm_mem_type_manager *man;
 168
 169         lockdep_assert_held(&bo->resv->lock.base);
 170
 171         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 172
 173                 BUG_ON(!list_empty(&bo->lru));
 174
 175                 man = &bdev->man[bo->mem.mem_type];
 176                 list_add_tail(&bo->lru, &man->lru);
 177                 kref_get(&bo->list_kref);
 178
 179                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 180                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 181                         kref_get(&bo->list_kref);
 182                 }
 183         }
 184 }
 185 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 186
 187 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 188 {
 189         int put_count = 0;
 190
 191         if (!list_empty(&bo->swap)) {
 192                 list_del_init(&bo->swap);
 193                 ++put_count;
 194         }
 195         if (!list_empty(&bo->lru)) {
 196                 list_del_init(&bo->lru);
 197                 ++put_count;
 198         }
 199
 200         /*
 201          * TODO: Add a driver hook to delete from
 202          * driver-specific LRU's here.
 203          */
 204
 205         return put_count;
 206 }
 207
 208 static void ttm_bo_ref_bug(struct kref *list_kref)
 209 {
 210         BUG();
 211 }
 212
 213 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 214                          bool never_free)
 215 {
 216         kref_sub(&bo->list_kref, count,
 217                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 218 }
 219
 220 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 221 {
 222         int put_count;
 223
 224         spin_lock(&bo->glob->lru_lock);
 225         put_count = ttm_bo_del_from_lru(bo);
 226         spin_unlock(&bo->glob->lru_lock);
 227         ttm_bo_list_ref_sub(bo, put_count, true);
 228 }
 229 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 230
 231 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 232 {
 233         struct ttm_bo_device *bdev = bo->bdev;
 234         struct ttm_mem_type_manager *man;
 235
 236         lockdep_assert_held(&bo->resv->lock.base);
 237
 238         if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 239                 list_del_init(&bo->swap);
 240                 list_del_init(&bo->lru);
 241
 242         } else {
 243                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG))
 244                         list_move_tail(&bo->swap, &bo->glob->swap_lru);
 245
 246                 man = &bdev->man[bo->mem.mem_type];
 247                 list_move_tail(&bo->lru, &man->lru);
 248         }
 249 }
 250 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 251
 252 /*
 253  * Call bo->mutex locked.
 254  */
 255 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 256 {
 257         struct ttm_bo_device *bdev = bo->bdev;
 258         struct ttm_bo_global *glob = bo->glob;
 259         int ret = 0;
 260         uint32_t page_flags = 0;
 261
 262         TTM_ASSERT_LOCKED(&bo->mutex);
 263         bo->ttm = NULL;
 264
 265         if (bdev->need_dma32)
 266                 page_flags |= TTM_PAGE_FLAG_DMA32;
 267
 268         switch (bo->type) {
 269         case ttm_bo_type_device:
 270                 if (zero_alloc)
 271                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 272         case ttm_bo_type_kernel:
 273                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 274                                                       page_flags, glob->dummy_read_page);
 275                 if (unlikely(bo->ttm == NULL))
 276                         ret = -ENOMEM;
 277                 break;
 278         case ttm_bo_type_sg:
 279                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 280                                                       page_flags | TTM_PAGE_FLAG_SG,
 281                                                       glob->dummy_read_page);
 282                 if (unlikely(bo->ttm == NULL)) {
 283                         ret = -ENOMEM;
 284                         break;
 285                 }
 286                 bo->ttm->sg = bo->sg;
 287                 break;
 288         default:
 289                 pr_err("Illegal buffer object type\n");
 290                 ret = -EINVAL;
 291                 break;
 292         }
 293
 294         return ret;
 295 }
 296
 297 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 298                                   struct ttm_mem_reg *mem,
 299                                   bool evict, bool interruptible,
 300                                   bool no_wait_gpu)
 301 {
 302         struct ttm_bo_device *bdev = bo->bdev;
 303         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 304         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 305         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 306         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 307         int ret = 0;
 308
 309         if (old_is_pci || new_is_pci ||
 310             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 311                 ret = ttm_mem_io_lock(old_man, true);
 312                 if (unlikely(ret != 0))
 313                         goto out_err;
 314                 ttm_bo_unmap_virtual_locked(bo);
 315                 ttm_mem_io_unlock(old_man);
 316         }
 317
 318         /*
 319          * Create and bind a ttm if required.
 320          */
 321
 322         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 323                 if (bo->ttm == NULL) {
 324                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 325                         ret = ttm_bo_add_ttm(bo, zero);
 326                         if (ret)
 327                                 goto out_err;
 328                 }
 329
 330                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 331                 if (ret)
 332                         goto out_err;
 333
 334                 if (mem->mem_type != TTM_PL_SYSTEM) {
 335                         ret = ttm_tt_bind(bo->ttm, mem);
 336                         if (ret)
 337                                 goto out_err;
 338                 }
 339
 340                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 341                         if (bdev->driver->move_notify)
 342                                 bdev->driver->move_notify(bo, mem);
 343                         bo->mem = *mem;
 344                         mem->mm_node = NULL;
 345                         goto moved;
 346                 }
 347         }
 348
 349         if (bdev->driver->move_notify)
 350                 bdev->driver->move_notify(bo, mem);
 351
 352         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 353             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 354                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 355         else if (bdev->driver->move)
 356                 ret = bdev->driver->move(bo, evict, interruptible,
 357                                          no_wait_gpu, mem);
 358         else
 359                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 360
 361         if (ret) {
 362                 if (bdev->driver->move_notify) {
 363                         struct ttm_mem_reg tmp_mem = *mem;
 364                         *mem = bo->mem;
 365                         bo->mem = tmp_mem;
 366                         bdev->driver->move_notify(bo, mem);
 367                         bo->mem = *mem;
 368                         *mem = tmp_mem;
 369                 }
 370
 371                 goto out_err;
 372         }
 373
 374 moved:
 375         if (bo->evicted) {
 376                 if (bdev->driver->invalidate_caches) {
 377                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 378                         if (ret)
 379                                 pr_err("Can not flush read caches\n");
 380                 }
 381                 bo->evicted = false;
 382         }
 383
 384         if (bo->mem.mm_node) {
 385                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 386                     bdev->man[bo->mem.mem_type].gpu_offset;
 387                 bo->cur_placement = bo->mem.placement;
 388         } else
 389                 bo->offset = 0;
 390
 391         return 0;
 392
 393 out_err:
 394         new_man = &bdev->man[bo->mem.mem_type];
 395         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 396                 ttm_tt_unbind(bo->ttm);
 397                 ttm_tt_destroy(bo->ttm);
 398                 bo->ttm = NULL;
 399         }
 400
 401         return ret;
 402 }
 403
 404 /**
 405  * Call bo::reserved.
 406  * Will release GPU memory type usage on destruction.
 407  * This is the place to put in driver specific hooks to release
 408  * driver private resources.
 409  * Will release the bo::reserved lock.
 410  */
 411
 412 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 413 {
 414         if (bo->bdev->driver->move_notify)
 415                 bo->bdev->driver->move_notify(bo, NULL);
 416
 417         if (bo->ttm) {
 418                 ttm_tt_unbind(bo->ttm);
 419                 ttm_tt_destroy(bo->ttm);
 420                 bo->ttm = NULL;
 421         }
 422         ttm_bo_mem_put(bo, &bo->mem);
 423
 424         ww_mutex_unlock (&bo->resv->lock);
 425 }
 426
 427 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 428 {
 429         struct reservation_object_list *fobj;
 430         struct fence *fence;
 431         int i;
 432
 433         fobj = reservation_object_get_list(bo->resv);
 434         fence = reservation_object_get_excl(bo->resv);
 435         if (fence && !fence->ops->signaled)
 436                 fence_enable_sw_signaling(fence);
 437
 438         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 439                 fence = rcu_dereference_protected(fobj->shared[i],
 440                                         reservation_object_held(bo->resv));
 441
 442                 if (!fence->ops->signaled)
 443                         fence_enable_sw_signaling(fence);
 444         }
 445 }
 446
 447 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 448 {
 449         struct ttm_bo_device *bdev = bo->bdev;
 450         struct ttm_bo_global *glob = bo->glob;
 451         int put_count;
 452         int ret;
 453
 454         spin_lock(&glob->lru_lock);
 455         ret = __ttm_bo_reserve(bo, false, true, false, NULL);
 456
 457         if (!ret) {
 458                 if (!ttm_bo_wait(bo, false, false, true)) {
 459                         put_count = ttm_bo_del_from_lru(bo);
 460
 461                         spin_unlock(&glob->lru_lock);
 462                         ttm_bo_cleanup_memtype_use(bo);
 463
 464                         ttm_bo_list_ref_sub(bo, put_count, true);
 465
 466                         return;
 467                 } else
 468                         ttm_bo_flush_all_fences(bo);
 469
 470                 /*
 471                  * Make NO_EVICT bos immediately available to
 472                  * shrinkers, now that they are queued for
 473                  * destruction.
 474                  */
 475                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 476                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 477                         ttm_bo_add_to_lru(bo);
 478                 }
 479
 480                 __ttm_bo_unreserve(bo);
 481         }
 482
 483         kref_get(&bo->list_kref);
 484         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 485         spin_unlock(&glob->lru_lock);
 486
 487         schedule_delayed_work(&bdev->wq,
 488                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 489 }
 490
 491 /**
 492  * function ttm_bo_cleanup_refs_and_unlock
 493  * If bo idle, remove from delayed- and lru lists, and unref.
 494  * If not idle, do nothing.
 495  *
 496  * Must be called with lru_lock and reservation held, this function
 497  * will drop both before returning.
 498  *
 499  * @interruptible         Any sleeps should occur interruptibly.
 500  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 501  */
 502
 503 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 504                                           bool interruptible,
 505                                           bool no_wait_gpu)
 506 {
 507         struct ttm_bo_global *glob = bo->glob;
 508         int put_count;
 509         int ret;
 510
 511         ret = ttm_bo_wait(bo, false, false, true);
 512
 513         if (ret && !no_wait_gpu) {
 514                 long lret;
 515                 ww_mutex_unlock(&bo->resv->lock);
 516                 spin_unlock(&glob->lru_lock);
 517
 518                 lret = reservation_object_wait_timeout_rcu(bo->resv,
 519                                                            true,
 520                                                            interruptible,
 521                                                            30 * HZ);
 522
 523                 if (lret < 0)
 524                         return lret;
 525                 else if (lret == 0)
 526                         return -EBUSY;
 527
 528                 spin_lock(&glob->lru_lock);
 529                 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
 530
 531                 /*
 532                  * We raced, and lost, someone else holds the reservation now,
 533                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 534                  *
 535                  * Even if it's not the case, because we finished waiting any
 536                  * delayed destruction would succeed, so just return success
 537                  * here.
 538                  */
 539                 if (ret) {
 540                         spin_unlock(&glob->lru_lock);
 541                         return 0;
 542                 }
 543
 544                 /*
 545                  * remove sync_obj with ttm_bo_wait, the wait should be
 546                  * finished, and no new wait object should have been added.
 547                  */
 548                 ret = ttm_bo_wait(bo, false, false, true);
 549                 WARN_ON(ret);
 550         }
 551
 552         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 553                 __ttm_bo_unreserve(bo);
 554                 spin_unlock(&glob->lru_lock);
 555                 return ret;
 556         }
 557
 558         put_count = ttm_bo_del_from_lru(bo);
 559         list_del_init(&bo->ddestroy);
 560         ++put_count;
 561
 562         spin_unlock(&glob->lru_lock);
 563         ttm_bo_cleanup_memtype_use(bo);
 564
 565         ttm_bo_list_ref_sub(bo, put_count, true);
 566
 567         return 0;
 568 }
 569
 570 /**
 571  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 572  * encountered buffers.
 573  */
 574
 575 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 576 {
 577         struct ttm_bo_global *glob = bdev->glob;
 578         struct ttm_buffer_object *entry = NULL;
 579         int ret = 0;
 580
 581         spin_lock(&glob->lru_lock);
 582         if (list_empty(&bdev->ddestroy))
 583                 goto out_unlock;
 584
 585         entry = list_first_entry(&bdev->ddestroy,
 586                 struct ttm_buffer_object, ddestroy);
 587         kref_get(&entry->list_kref);
 588
 589         for (;;) {
 590                 struct ttm_buffer_object *nentry = NULL;
 591
 592                 if (entry->ddestroy.next != &bdev->ddestroy) {
 593                         nentry = list_first_entry(&entry->ddestroy,
 594                                 struct ttm_buffer_object, ddestroy);
 595                         kref_get(&nentry->list_kref);
 596                 }
 597
 598                 ret = __ttm_bo_reserve(entry, false, true, false, NULL);
 599                 if (remove_all && ret) {
 600                         spin_unlock(&glob->lru_lock);
 601                         ret = __ttm_bo_reserve(entry, false, false,
 602                                                false, NULL);
 603                         spin_lock(&glob->lru_lock);
 604                 }
 605
 606                 if (!ret)
 607                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 608                                                              !remove_all);
 609                 else
 610                         spin_unlock(&glob->lru_lock);
 611
 612                 kref_put(&entry->list_kref, ttm_bo_release_list);
 613                 entry = nentry;
 614
 615                 if (ret || !entry)
 616                         goto out;
 617
 618                 spin_lock(&glob->lru_lock);
 619                 if (list_empty(&entry->ddestroy))
 620                         break;
 621         }
 622
 623 out_unlock:
 624         spin_unlock(&glob->lru_lock);
 625 out:
 626         if (entry)
 627                 kref_put(&entry->list_kref, ttm_bo_release_list);
 628         return ret;
 629 }
 630
 631 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 632 {
 633         struct ttm_bo_device *bdev =
 634             container_of(work, struct ttm_bo_device, wq.work);
 635
 636         if (ttm_bo_delayed_delete(bdev, false)) {
 637                 schedule_delayed_work(&bdev->wq,
 638                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 639         }
 640 }
 641
 642 static void ttm_bo_release(struct kref *kref)
 643 {
 644         struct ttm_buffer_object *bo =
 645             container_of(kref, struct ttm_buffer_object, kref);
 646         struct ttm_bo_device *bdev = bo->bdev;
 647         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 648
 649         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 650         ttm_mem_io_lock(man, false);
 651         ttm_mem_io_free_vm(bo);
 652         ttm_mem_io_unlock(man);
 653         ttm_bo_cleanup_refs_or_queue(bo);
 654         kref_put(&bo->list_kref, ttm_bo_release_list);
 655 }
 656
 657 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 658 {
 659         struct ttm_buffer_object *bo = *p_bo;
 660
 661         *p_bo = NULL;
 662         kref_put(&bo->kref, ttm_bo_release);
 663 }
 664 EXPORT_SYMBOL(ttm_bo_unref);
 665
 666 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 667 {
 668         return cancel_delayed_work_sync(&bdev->wq);
 669 }
 670 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 671
 672 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 673 {
 674         if (resched)
 675                 schedule_delayed_work(&bdev->wq,
 676                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 677 }
 678 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 679
 680 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 681                         bool no_wait_gpu)
 682 {
 683         struct ttm_bo_device *bdev = bo->bdev;
 684         struct ttm_mem_reg evict_mem;
 685         struct ttm_placement placement;
 686         int ret = 0;
 687
 688         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 689
 690         if (unlikely(ret != 0)) {
 691                 if (ret != -ERESTARTSYS) {
 692                         pr_err("Failed to expire sync object before buffer eviction\n");
 693                 }
 694                 goto out;
 695         }
 696
 697         lockdep_assert_held(&bo->resv->lock.base);
 698
 699         evict_mem = bo->mem;
 700         evict_mem.mm_node = NULL;
 701         evict_mem.bus.io_reserved_vm = false;
 702         evict_mem.bus.io_reserved_count = 0;
 703
 704         placement.num_placement = 0;
 705         placement.num_busy_placement = 0;
 706         bdev->driver->evict_flags(bo, &placement);
 707         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 708                                 no_wait_gpu);
 709         if (ret) {
 710                 if (ret != -ERESTARTSYS) {
 711                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 712                                bo);
 713                         ttm_bo_mem_space_debug(bo, &placement);
 714                 }
 715                 goto out;
 716         }
 717
 718         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 719                                      no_wait_gpu);
 720         if (ret) {
 721                 if (ret != -ERESTARTSYS)
 722                         pr_err("Buffer eviction failed\n");
 723                 ttm_bo_mem_put(bo, &evict_mem);
 724                 goto out;
 725         }
 726         bo->evicted = true;
 727 out:
 728         return ret;
 729 }
 730
 731 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 732                                 uint32_t mem_type,
 733                                 const struct ttm_place *place,
 734                                 bool interruptible,
 735                                 bool no_wait_gpu)
 736 {
 737         struct ttm_bo_global *glob = bdev->glob;
 738         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 739         struct ttm_buffer_object *bo;
 740         int ret = -EBUSY, put_count;
 741
 742         spin_lock(&glob->lru_lock);
 743         list_for_each_entry(bo, &man->lru, lru) {
 744                 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
 745                 if (!ret) {
 746                         if (place && (place->fpfn || place->lpfn)) {
 747                                 /* Don't evict this BO if it's outside of the
 748                                  * requested placement range
 749                                  */
 750                                 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 751                                     (place->lpfn && place->lpfn <= bo->mem.start)) {
 752                                         __ttm_bo_unreserve(bo);
 753                                         ret = -EBUSY;
 754                                         continue;
 755                                 }
 756                         }
 757
 758                         break;
 759                 }
 760         }
 761
 762         if (ret) {
 763                 spin_unlock(&glob->lru_lock);
 764                 return ret;
 765         }
 766
 767         kref_get(&bo->list_kref);
 768
 769         if (!list_empty(&bo->ddestroy)) {
 770                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 771                                                      no_wait_gpu);
 772                 kref_put(&bo->list_kref, ttm_bo_release_list);
 773                 return ret;
 774         }
 775
 776         put_count = ttm_bo_del_from_lru(bo);
 777         spin_unlock(&glob->lru_lock);
 778
 779         BUG_ON(ret != 0);
 780
 781         ttm_bo_list_ref_sub(bo, put_count, true);
 782
 783         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 784         ttm_bo_unreserve(bo);
 785
 786         kref_put(&bo->list_kref, ttm_bo_release_list);
 787         return ret;
 788 }
 789
 790 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 791 {
 792         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 793
 794         if (mem->mm_node)
 795                 (*man->func->put_node)(man, mem);
 796 }
 797 EXPORT_SYMBOL(ttm_bo_mem_put);
 798
 799 /**
 800  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 801  * space, or we've evicted everything and there isn't enough space.
 802  */
 803 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 804                                         uint32_t mem_type,
 805                                         const struct ttm_place *place,
 806                                         struct ttm_mem_reg *mem,
 807                                         bool interruptible,
 808                                         bool no_wait_gpu)
 809 {
 810         struct ttm_bo_device *bdev = bo->bdev;
 811         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 812         int ret;
 813
 814         do {
 815                 ret = (*man->func->get_node)(man, bo, place, mem);
 816                 if (unlikely(ret != 0))
 817                         return ret;
 818                 if (mem->mm_node)
 819                         break;
 820                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 821                                           interruptible, no_wait_gpu);
 822                 if (unlikely(ret != 0))
 823                         return ret;
 824         } while (1);
 825         if (mem->mm_node == NULL)
 826                 return -ENOMEM;
 827         mem->mem_type = mem_type;
 828         return 0;
 829 }
 830
 831 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 832                                       uint32_t cur_placement,
 833                                       uint32_t proposed_placement)
 834 {
 835         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 836         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 837
 838         /**
 839          * Keep current caching if possible.
 840          */
 841
 842         if ((cur_placement & caching) != 0)
 843                 result |= (cur_placement & caching);
 844         else if ((man->default_caching & caching) != 0)
 845                 result |= man->default_caching;
 846         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 847                 result |= TTM_PL_FLAG_CACHED;
 848         else if ((TTM_PL_FLAG_WC & caching) != 0)
 849                 result |= TTM_PL_FLAG_WC;
 850         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 851                 result |= TTM_PL_FLAG_UNCACHED;
 852
 853         return result;
 854 }
 855
 856 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 857                                  uint32_t mem_type,
 858                                  const struct ttm_place *place,
 859                                  uint32_t *masked_placement)
 860 {
 861         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 862
 863         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 864                 return false;
 865
 866         if ((place->flags & man->available_caching) == 0)
 867                 return false;
 868
 869         cur_flags |= (place->flags & man->available_caching);
 870
 871         *masked_placement = cur_flags;
 872         return true;
 873 }
 874
 875 /**
 876  * Creates space for memory region @mem according to its type.
 877  *
 878  * This function first searches for free space in compatible memory types in
 879  * the priority order defined by the driver.  If free space isn't found, then
 880  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 881  * space.
 882  */
 883 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 884                         struct ttm_placement *placement,
 885                         struct ttm_mem_reg *mem,
 886                         bool interruptible,
 887                         bool no_wait_gpu)
 888 {
 889         struct ttm_bo_device *bdev = bo->bdev;
 890         struct ttm_mem_type_manager *man;
 891         uint32_t mem_type = TTM_PL_SYSTEM;
 892         uint32_t cur_flags = 0;
 893         bool type_found = false;
 894         bool type_ok = false;
 895         bool has_erestartsys = false;
 896         int i, ret;
 897
 898         mem->mm_node = NULL;
 899         for (i = 0; i < placement->num_placement; ++i) {
 900                 const struct ttm_place *place = &placement->placement[i];
 901
 902                 ret = ttm_mem_type_from_place(place, &mem_type);
 903                 if (ret)
 904                         return ret;
 905                 man = &bdev->man[mem_type];
 906                 if (!man->has_type || !man->use_type)
 907                         continue;
 908
 909                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 910                                                 &cur_flags);
 911
 912                 if (!type_ok)
 913                         continue;
 914
 915                 type_found = true;
 916                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 917                                                   cur_flags);
 918                 /*
 919                  * Use the access and other non-mapping-related flag bits from
 920                  * the memory placement flags to the current flags
 921                  */
 922                 ttm_flag_masked(&cur_flags, place->flags,
 923                                 ~TTM_PL_MASK_MEMTYPE);
 924
 925                 if (mem_type == TTM_PL_SYSTEM)
 926                         break;
 927
 928                 ret = (*man->func->get_node)(man, bo, place, mem);
 929                 if (unlikely(ret))
 930                         return ret;
 931
 932                 if (mem->mm_node)
 933                         break;
 934         }
 935
 936         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 937                 mem->mem_type = mem_type;
 938                 mem->placement = cur_flags;
 939                 return 0;
 940         }
 941
 942         for (i = 0; i < placement->num_busy_placement; ++i) {
 943                 const struct ttm_place *place = &placement->busy_placement[i];
 944
 945                 ret = ttm_mem_type_from_place(place, &mem_type);
 946                 if (ret)
 947                         return ret;
 948                 man = &bdev->man[mem_type];
 949                 if (!man->has_type || !man->use_type)
 950                         continue;
 951                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 952                         continue;
 953
 954                 type_found = true;
 955                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 956                                                   cur_flags);
 957                 /*
 958                  * Use the access and other non-mapping-related flag bits from
 959                  * the memory placement flags to the current flags
 960                  */
 961                 ttm_flag_masked(&cur_flags, place->flags,
 962                                 ~TTM_PL_MASK_MEMTYPE);
 963
 964                 if (mem_type == TTM_PL_SYSTEM) {
 965                         mem->mem_type = mem_type;
 966                         mem->placement = cur_flags;
 967                         mem->mm_node = NULL;
 968                         return 0;
 969                 }
 970
 971                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
 972                                                 interruptible, no_wait_gpu);
 973                 if (ret == 0 && mem->mm_node) {
 974                         mem->placement = cur_flags;
 975                         return 0;
 976                 }
 977                 if (ret == -ERESTARTSYS)
 978                         has_erestartsys = true;
 979         }
 980
 981         if (!type_found) {
 982                 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
 983                 return -EINVAL;
 984         }
 985
 986         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
 987 }
 988 EXPORT_SYMBOL(ttm_bo_mem_space);
 989
 990 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 991                         struct ttm_placement *placement,
 992                         bool interruptible,
 993                         bool no_wait_gpu)
 994 {
 995         int ret = 0;
 996         struct ttm_mem_reg mem;
 997
 998         lockdep_assert_held(&bo->resv->lock.base);
 999
1000         /*
1001          * FIXME: It's possible to pipeline buffer moves.
1002          * Have the driver move function wait for idle when necessary,
1003          * instead of doing it here.
1004          */
1005         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1006         if (ret)
1007                 return ret;
1008         mem.num_pages = bo->num_pages;
1009         mem.size = mem.num_pages << PAGE_SHIFT;
1010         mem.page_alignment = bo->mem.page_alignment;
1011         mem.bus.io_reserved_vm = false;
1012         mem.bus.io_reserved_count = 0;
1013         /*
1014          * Determine where to move the buffer.
1015          */
1016         ret = ttm_bo_mem_space(bo, placement, &mem,
1017                                interruptible, no_wait_gpu);
1018         if (ret)
1019                 goto out_unlock;
1020         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1021                                      interruptible, no_wait_gpu);
1022 out_unlock:
1023         if (ret && mem.mm_node)
1024                 ttm_bo_mem_put(bo, &mem);
1025         return ret;
1026 }
1027
1028 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1029                               struct ttm_mem_reg *mem,
1030                               uint32_t *new_flags)
1031 {
1032         int i;
1033
1034         for (i = 0; i < placement->num_placement; i++) {
1035                 const struct ttm_place *heap = &placement->placement[i];
1036                 if (mem->mm_node &&
1037                     (mem->start < heap->fpfn ||
1038                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1039                         continue;
1040
1041                 *new_flags = heap->flags;
1042                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1043                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1044                         return true;
1045         }
1046
1047         for (i = 0; i < placement->num_busy_placement; i++) {
1048                 const struct ttm_place *heap = &placement->busy_placement[i];
1049                 if (mem->mm_node &&
1050                     (mem->start < heap->fpfn ||
1051                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1052                         continue;
1053
1054                 *new_flags = heap->flags;
1055                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1056                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1057                         return true;
1058         }
1059
1060         return false;
1061 }
1062
1063 int ttm_bo_validate(struct ttm_buffer_object *bo,
1064                         struct ttm_placement *placement,
1065                         bool interruptible,
1066                         bool no_wait_gpu)
1067 {
1068         int ret;
1069         uint32_t new_flags;
1070
1071         lockdep_assert_held(&bo->resv->lock.base);
1072         /*
1073          * Check whether we need to move buffer.
1074          */
1075         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1076                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1077                                          no_wait_gpu);
1078                 if (ret)
1079                         return ret;
1080         } else {
1081                 /*
1082                  * Use the access and other non-mapping-related flag bits from
1083                  * the compatible memory placement flags to the active flags
1084                  */
1085                 ttm_flag_masked(&bo->mem.placement, new_flags,
1086                                 ~TTM_PL_MASK_MEMTYPE);
1087         }
1088         /*
1089          * We might need to add a TTM.
1090          */
1091         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1092                 ret = ttm_bo_add_ttm(bo, true);
1093                 if (ret)
1094                         return ret;
1095         }
1096         return 0;
1097 }
1098 EXPORT_SYMBOL(ttm_bo_validate);
1099
1100 int ttm_bo_init(struct ttm_bo_device *bdev,
1101                 struct ttm_buffer_object *bo,
1102                 unsigned long size,
1103                 enum ttm_bo_type type,
1104                 struct ttm_placement *placement,
1105                 uint32_t page_alignment,
1106                 bool interruptible,
1107                 struct file *persistent_swap_storage,
1108                 size_t acc_size,
1109                 struct sg_table *sg,
1110                 struct reservation_object *resv,
1111                 void (*destroy) (struct ttm_buffer_object *))
1112 {
1113         int ret = 0;
1114         unsigned long num_pages;
1115         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1116         bool locked;
1117
1118         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1119         if (ret) {
1120                 pr_err("Out of kernel memory\n");
1121                 if (destroy)
1122                         (*destroy)(bo);
1123                 else
1124                         kfree(bo);
1125                 return -ENOMEM;
1126         }
1127
1128         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1129         if (num_pages == 0) {
1130                 pr_err("Illegal buffer object size\n");
1131                 if (destroy)
1132                         (*destroy)(bo);
1133                 else
1134                         kfree(bo);
1135                 ttm_mem_global_free(mem_glob, acc_size);
1136                 return -EINVAL;
1137         }
1138         bo->destroy = destroy;
1139
1140         kref_init(&bo->kref);
1141         kref_init(&bo->list_kref);
1142         atomic_set(&bo->cpu_writers, 0);
1143         INIT_LIST_HEAD(&bo->lru);
1144         INIT_LIST_HEAD(&bo->ddestroy);
1145         INIT_LIST_HEAD(&bo->swap);
1146         INIT_LIST_HEAD(&bo->io_reserve_lru);
1147         mutex_init(&bo->wu_mutex);
1148         bo->bdev = bdev;
1149         bo->glob = bdev->glob;
1150         bo->type = type;
1151         bo->num_pages = num_pages;
1152         bo->mem.size = num_pages << PAGE_SHIFT;
1153         bo->mem.mem_type = TTM_PL_SYSTEM;
1154         bo->mem.num_pages = bo->num_pages;
1155         bo->mem.mm_node = NULL;
1156         bo->mem.page_alignment = page_alignment;
1157         bo->mem.bus.io_reserved_vm = false;
1158         bo->mem.bus.io_reserved_count = 0;
1159         bo->priv_flags = 0;
1160         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1161         bo->persistent_swap_storage = persistent_swap_storage;
1162         bo->acc_size = acc_size;
1163         bo->sg = sg;
1164         if (resv) {
1165                 bo->resv = resv;
1166                 lockdep_assert_held(&bo->resv->lock.base);
1167         } else {
1168                 bo->resv = &bo->ttm_resv;
1169                 reservation_object_init(&bo->ttm_resv);
1170         }
1171         atomic_inc(&bo->glob->bo_count);
1172         drm_vma_node_reset(&bo->vma_node);
1173
1174         /*
1175          * For ttm_bo_type_device buffers, allocate
1176          * address space from the device.
1177          */
1178         if (bo->type == ttm_bo_type_device ||
1179             bo->type == ttm_bo_type_sg)
1180                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1181                                          bo->mem.num_pages);
1182
1183         /* passed reservation objects should already be locked,
1184          * since otherwise lockdep will be angered in radeon.
1185          */
1186         if (!resv) {
1187                 locked = ww_mutex_trylock(&bo->resv->lock);
1188                 WARN_ON(!locked);
1189         }
1190
1191         if (likely(!ret))
1192                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1193
1194         if (!resv) {
1195                 ttm_bo_unreserve(bo);
1196
1197         } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1198                 spin_lock(&bo->glob->lru_lock);
1199                 ttm_bo_add_to_lru(bo);
1200                 spin_unlock(&bo->glob->lru_lock);
1201         }
1202
1203         if (unlikely(ret))
1204                 ttm_bo_unref(&bo);
1205
1206         return ret;
1207 }
1208 EXPORT_SYMBOL(ttm_bo_init);
1209
1210 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1211                        unsigned long bo_size,
1212                        unsigned struct_size)
1213 {
1214         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1215         size_t size = 0;
1216
1217         size += ttm_round_pot(struct_size);
1218         size += PAGE_ALIGN(npages * sizeof(void *));
1219         size += ttm_round_pot(sizeof(struct ttm_tt));
1220         return size;
1221 }
1222 EXPORT_SYMBOL(ttm_bo_acc_size);
1223
1224 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1225                            unsigned long bo_size,
1226                            unsigned struct_size)
1227 {
1228         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1229         size_t size = 0;
1230
1231         size += ttm_round_pot(struct_size);
1232         size += PAGE_ALIGN(npages * sizeof(void *));
1233         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1234         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1235         return size;
1236 }
1237 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1238
1239 int ttm_bo_create(struct ttm_bo_device *bdev,
1240                         unsigned long size,
1241                         enum ttm_bo_type type,
1242                         struct ttm_placement *placement,
1243                         uint32_t page_alignment,
1244                         bool interruptible,
1245                         struct file *persistent_swap_storage,
1246                         struct ttm_buffer_object **p_bo)
1247 {
1248         struct ttm_buffer_object *bo;
1249         size_t acc_size;
1250         int ret;
1251
1252         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1253         if (unlikely(bo == NULL))
1254                 return -ENOMEM;
1255
1256         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1257         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1258                           interruptible, persistent_swap_storage, acc_size,
1259                           NULL, NULL, NULL);
1260         if (likely(ret == 0))
1261                 *p_bo = bo;
1262
1263         return ret;
1264 }
1265 EXPORT_SYMBOL(ttm_bo_create);
1266
1267 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1268                                         unsigned mem_type, bool allow_errors)
1269 {
1270         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1271         struct ttm_bo_global *glob = bdev->glob;
1272         int ret;
1273
1274         /*
1275          * Can't use standard list traversal since we're unlocking.
1276          */
1277
1278         spin_lock(&glob->lru_lock);
1279         while (!list_empty(&man->lru)) {
1280                 spin_unlock(&glob->lru_lock);
1281                 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1282                 if (ret) {
1283                         if (allow_errors) {
1284                                 return ret;
1285                         } else {
1286                                 pr_err("Cleanup eviction failed\n");
1287                         }
1288                 }
1289                 spin_lock(&glob->lru_lock);
1290         }
1291         spin_unlock(&glob->lru_lock);
1292         return 0;
1293 }
1294
1295 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1296 {
1297         struct ttm_mem_type_manager *man;
1298         int ret = -EINVAL;
1299
1300         if (mem_type >= TTM_NUM_MEM_TYPES) {
1301                 pr_err("Illegal memory type %d\n", mem_type);
1302                 return ret;
1303         }
1304         man = &bdev->man[mem_type];
1305
1306         if (!man->has_type) {
1307                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1308                        mem_type);
1309                 return ret;
1310         }
1311
1312         man->use_type = false;
1313         man->has_type = false;
1314
1315         ret = 0;
1316         if (mem_type > 0) {
1317                 ttm_bo_force_list_clean(bdev, mem_type, false);
1318
1319                 ret = (*man->func->takedown)(man);
1320         }
1321
1322         return ret;
1323 }
1324 EXPORT_SYMBOL(ttm_bo_clean_mm);
1325
1326 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1327 {
1328         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1329
1330         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1331                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1332                 return -EINVAL;
1333         }
1334
1335         if (!man->has_type) {
1336                 pr_err("Memory type %u has not been initialized\n", mem_type);
1337                 return 0;
1338         }
1339
1340         return ttm_bo_force_list_clean(bdev, mem_type, true);
1341 }
1342 EXPORT_SYMBOL(ttm_bo_evict_mm);
1343
1344 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1345                         unsigned long p_size)
1346 {
1347         int ret = -EINVAL;
1348         struct ttm_mem_type_manager *man;
1349
1350         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1351         man = &bdev->man[type];
1352         BUG_ON(man->has_type);
1353         man->io_reserve_fastpath = true;
1354         man->use_io_reserve_lru = false;
1355         mutex_init(&man->io_reserve_mutex);
1356         INIT_LIST_HEAD(&man->io_reserve_lru);
1357
1358         ret = bdev->driver->init_mem_type(bdev, type, man);
1359         if (ret)
1360                 return ret;
1361         man->bdev = bdev;
1362
1363         ret = 0;
1364         if (type != TTM_PL_SYSTEM) {
1365                 ret = (*man->func->init)(man, p_size);
1366                 if (ret)
1367                         return ret;
1368         }
1369         man->has_type = true;
1370         man->use_type = true;
1371         man->size = p_size;
1372
1373         INIT_LIST_HEAD(&man->lru);
1374
1375         return 0;
1376 }
1377 EXPORT_SYMBOL(ttm_bo_init_mm);
1378
1379 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1380 {
1381         struct ttm_bo_global *glob =
1382                 container_of(kobj, struct ttm_bo_global, kobj);
1383
1384         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1385         __free_page(glob->dummy_read_page);
1386         kfree(glob);
1387 }
1388
1389 void ttm_bo_global_release(struct drm_global_reference *ref)
1390 {
1391         struct ttm_bo_global *glob = ref->object;
1392
1393         kobject_del(&glob->kobj);
1394         kobject_put(&glob->kobj);
1395 }
1396 EXPORT_SYMBOL(ttm_bo_global_release);
1397
1398 int ttm_bo_global_init(struct drm_global_reference *ref)
1399 {
1400         struct ttm_bo_global_ref *bo_ref =
1401                 container_of(ref, struct ttm_bo_global_ref, ref);
1402         struct ttm_bo_global *glob = ref->object;
1403         int ret;
1404
1405         mutex_init(&glob->device_list_mutex);
1406         spin_lock_init(&glob->lru_lock);
1407         glob->mem_glob = bo_ref->mem_glob;
1408         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1409
1410         if (unlikely(glob->dummy_read_page == NULL)) {
1411                 ret = -ENOMEM;
1412                 goto out_no_drp;
1413         }
1414
1415         INIT_LIST_HEAD(&glob->swap_lru);
1416         INIT_LIST_HEAD(&glob->device_list);
1417
1418         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1419         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1420         if (unlikely(ret != 0)) {
1421                 pr_err("Could not register buffer object swapout\n");
1422                 goto out_no_shrink;
1423         }
1424
1425         atomic_set(&glob->bo_count, 0);
1426
1427         ret = kobject_init_and_add(
1428                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1429         if (unlikely(ret != 0))
1430                 kobject_put(&glob->kobj);
1431         return ret;
1432 out_no_shrink:
1433         __free_page(glob->dummy_read_page);
1434 out_no_drp:
1435         kfree(glob);
1436         return ret;
1437 }
1438 EXPORT_SYMBOL(ttm_bo_global_init);
1439
1440
1441 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1442 {
1443         int ret = 0;
1444         unsigned i = TTM_NUM_MEM_TYPES;
1445         struct ttm_mem_type_manager *man;
1446         struct ttm_bo_global *glob = bdev->glob;
1447
1448         while (i--) {
1449                 man = &bdev->man[i];
1450                 if (man->has_type) {
1451                         man->use_type = false;
1452                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1453                                 ret = -EBUSY;
1454                                 pr_err("DRM memory manager type %d is not clean\n",
1455                                        i);
1456                         }
1457                         man->has_type = false;
1458                 }
1459         }
1460
1461         mutex_lock(&glob->device_list_mutex);
1462         list_del(&bdev->device_list);
1463         mutex_unlock(&glob->device_list_mutex);
1464
1465         cancel_delayed_work_sync(&bdev->wq);
1466
1467         while (ttm_bo_delayed_delete(bdev, true))
1468                 ;
1469
1470         spin_lock(&glob->lru_lock);
1471         if (list_empty(&bdev->ddestroy))
1472                 TTM_DEBUG("Delayed destroy list was clean\n");
1473
1474         if (list_empty(&bdev->man[0].lru))
1475                 TTM_DEBUG("Swap list was clean\n");
1476         spin_unlock(&glob->lru_lock);
1477
1478         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1479
1480         return ret;
1481 }
1482 EXPORT_SYMBOL(ttm_bo_device_release);
1483
1484 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1485                        struct ttm_bo_global *glob,
1486                        struct ttm_bo_driver *driver,
1487                        struct address_space *mapping,
1488                        uint64_t file_page_offset,
1489                        bool need_dma32)
1490 {
1491         int ret = -EINVAL;
1492
1493         bdev->driver = driver;
1494
1495         memset(bdev->man, 0, sizeof(bdev->man));
1496
1497         /*
1498          * Initialize the system memory buffer type.
1499          * Other types need to be driver / IOCTL initialized.
1500          */
1501         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1502         if (unlikely(ret != 0))
1503                 goto out_no_sys;
1504
1505         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1506                                     0x10000000);
1507         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1508         INIT_LIST_HEAD(&bdev->ddestroy);
1509         bdev->dev_mapping = mapping;
1510         bdev->glob = glob;
1511         bdev->need_dma32 = need_dma32;
1512         bdev->val_seq = 0;
1513         mutex_lock(&glob->device_list_mutex);
1514         list_add_tail(&bdev->device_list, &glob->device_list);
1515         mutex_unlock(&glob->device_list_mutex);
1516
1517         return 0;
1518 out_no_sys:
1519         return ret;
1520 }
1521 EXPORT_SYMBOL(ttm_bo_device_init);
1522
1523 /*
1524  * buffer object vm functions.
1525  */
1526
1527 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1528 {
1529         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1530
1531         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1532                 if (mem->mem_type == TTM_PL_SYSTEM)
1533                         return false;
1534
1535                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1536                         return false;
1537
1538                 if (mem->placement & TTM_PL_FLAG_CACHED)
1539                         return false;
1540         }
1541         return true;
1542 }
1543
1544 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1545 {
1546         struct ttm_bo_device *bdev = bo->bdev;
1547
1548         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1549         ttm_mem_io_free_vm(bo);
1550 }
1551
1552 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1553 {
1554         struct ttm_bo_device *bdev = bo->bdev;
1555         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1556
1557         ttm_mem_io_lock(man, false);
1558         ttm_bo_unmap_virtual_locked(bo);
1559         ttm_mem_io_unlock(man);
1560 }
1561
1562
1563 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1564
1565 int ttm_bo_wait(struct ttm_buffer_object *bo,
1566                 bool lazy, bool interruptible, bool no_wait)
1567 {
1568         struct reservation_object_list *fobj;
1569         struct reservation_object *resv;
1570         struct fence *excl;
1571         long timeout = 15 * HZ;
1572         int i;
1573
1574         resv = bo->resv;
1575         fobj = reservation_object_get_list(resv);
1576         excl = reservation_object_get_excl(resv);
1577         if (excl) {
1578                 if (!fence_is_signaled(excl)) {
1579                         if (no_wait)
1580                                 return -EBUSY;
1581
1582                         timeout = fence_wait_timeout(excl,
1583                                                      interruptible, timeout);
1584                 }
1585         }
1586
1587         for (i = 0; fobj && timeout > 0 && i < fobj->shared_count; ++i) {
1588                 struct fence *fence;
1589                 fence = rcu_dereference_protected(fobj->shared[i],
1590                                                 reservation_object_held(resv));
1591
1592                 if (!fence_is_signaled(fence)) {
1593                         if (no_wait)
1594                                 return -EBUSY;
1595
1596                         timeout = fence_wait_timeout(fence,
1597                                                      interruptible, timeout);
1598                 }
1599         }
1600
1601         if (timeout < 0)
1602                 return timeout;
1603
1604         if (timeout == 0)
1605                 return -EBUSY;
1606
1607         reservation_object_add_excl_fence(resv, NULL);
1608         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1609         return 0;
1610 }
1611 EXPORT_SYMBOL(ttm_bo_wait);
1612
1613 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1614 {
1615         int ret = 0;
1616
1617         /*
1618          * Using ttm_bo_reserve makes sure the lru lists are updated.
1619          */
1620
1621         ret = ttm_bo_reserve(bo, true, no_wait, false, NULL);
1622         if (unlikely(ret != 0))
1623                 return ret;
1624         ret = ttm_bo_wait(bo, false, true, no_wait);
1625         if (likely(ret == 0))
1626                 atomic_inc(&bo->cpu_writers);
1627         ttm_bo_unreserve(bo);
1628         return ret;
1629 }
1630 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1631
1632 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1633 {
1634         atomic_dec(&bo->cpu_writers);
1635 }
1636 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1637
1638 /**
1639  * A buffer object shrink method that tries to swap out the first
1640  * buffer object on the bo_global::swap_lru list.
1641  */
1642
1643 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1644 {
1645         struct ttm_bo_global *glob =
1646             container_of(shrink, struct ttm_bo_global, shrink);
1647         struct ttm_buffer_object *bo;
1648         int ret = -EBUSY;
1649         int put_count;
1650         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1651
1652         spin_lock(&glob->lru_lock);
1653         list_for_each_entry(bo, &glob->swap_lru, swap) {
1654                 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
1655                 if (!ret)
1656                         break;
1657         }
1658
1659         if (ret) {
1660                 spin_unlock(&glob->lru_lock);
1661                 return ret;
1662         }
1663
1664         kref_get(&bo->list_kref);
1665
1666         if (!list_empty(&bo->ddestroy)) {
1667                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1668                 kref_put(&bo->list_kref, ttm_bo_release_list);
1669                 return ret;
1670         }
1671
1672         put_count = ttm_bo_del_from_lru(bo);
1673         spin_unlock(&glob->lru_lock);
1674
1675         ttm_bo_list_ref_sub(bo, put_count, true);
1676
1677         /**
1678          * Wait for GPU, then move to system cached.
1679          */
1680
1681         ret = ttm_bo_wait(bo, false, false, false);
1682
1683         if (unlikely(ret != 0))
1684                 goto out;
1685
1686         if ((bo->mem.placement & swap_placement) != swap_placement) {
1687                 struct ttm_mem_reg evict_mem;
1688
1689                 evict_mem = bo->mem;
1690                 evict_mem.mm_node = NULL;
1691                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1692                 evict_mem.mem_type = TTM_PL_SYSTEM;
1693
1694                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1695                                              false, false);
1696                 if (unlikely(ret != 0))
1697                         goto out;
1698         }
1699
1700         ttm_bo_unmap_virtual(bo);
1701
1702         /**
1703          * Swap out. Buffer will be swapped in again as soon as
1704          * anyone tries to access a ttm page.
1705          */
1706
1707         if (bo->bdev->driver->swap_notify)
1708                 bo->bdev->driver->swap_notify(bo);
1709
1710         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1711 out:
1712
1713         /**
1714          *
1715          * Unreserve without putting on LRU to avoid swapping out an
1716          * already swapped buffer.
1717          */
1718
1719         __ttm_bo_unreserve(bo);
1720         kref_put(&bo->list_kref, ttm_bo_release_list);
1721         return ret;
1722 }
1723
1724 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1725 {
1726         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1727                 ;
1728 }
1729 EXPORT_SYMBOL(ttm_bo_swapout_all);
1730
1731 /**
1732  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1733  * unreserved
1734  *
1735  * @bo: Pointer to buffer
1736  */
1737 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1738 {
1739         int ret;
1740
1741         /*
1742          * In the absense of a wait_unlocked API,
1743          * Use the bo::wu_mutex to avoid triggering livelocks due to
1744          * concurrent use of this function. Note that this use of
1745          * bo::wu_mutex can go away if we change locking order to
1746          * mmap_sem -> bo::reserve.
1747          */
1748         ret = mutex_lock_interruptible(&bo->wu_mutex);
1749         if (unlikely(ret != 0))
1750                 return -ERESTARTSYS;
1751         if (!ww_mutex_is_locked(&bo->resv->lock))
1752                 goto out_unlock;
1753         ret = __ttm_bo_reserve(bo, true, false, false, NULL);
1754         if (unlikely(ret != 0))
1755                 goto out_unlock;
1756         __ttm_bo_unreserve(bo);
1757
1758 out_unlock:
1759         mutex_unlock(&bo->wu_mutex);
1760         return ret;
1761 }