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