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