sys/dev/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  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_bo.c 248060 2013-03-08 18:11:02Z dumbbell $
  31  */
  32
  33 #define pr_fmt(fmt) "[TTM] " fmt
  34
  35 #include <drm/ttm/ttm_module.h>
  36 #include <drm/ttm/ttm_bo_driver.h>
  37 #include <drm/ttm/ttm_placement.h>
  38 #include <linux/atomic.h>
  39 #include <linux/export.h>
  40 #include <linux/rbtree.h>
  41
  42 #define TTM_ASSERT_LOCKED(param)
  43 #define TTM_DEBUG(fmt, arg...)
  44 #define TTM_BO_HASH_ORDER 13
  45
  46 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  47 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  48 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob);
  49
  50 MALLOC_DEFINE(M_TTM_BO, "ttm_bo", "TTM Buffer Objects");
  51
  52 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  53 {
  54         int i;
  55
  56         for (i = 0; i <= TTM_PL_PRIV5; i++)
  57                 if (flags & (1 << i)) {
  58                         *mem_type = i;
  59                         return 0;
  60                 }
  61         return -EINVAL;
  62 }
  63
  64 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  65 {
  66         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  67
  68         kprintf("    has_type: %d\n", man->has_type);
  69         kprintf("    use_type: %d\n", man->use_type);
  70         kprintf("    flags: 0x%08X\n", man->flags);
  71         kprintf("    gpu_offset: 0x%08lX\n", man->gpu_offset);
  72         kprintf("    size: %ju\n", (uintmax_t)man->size);
  73         kprintf("    available_caching: 0x%08X\n", man->available_caching);
  74         kprintf("    default_caching: 0x%08X\n", man->default_caching);
  75         if (mem_type != TTM_PL_SYSTEM)
  76                 (*man->func->debug)(man, TTM_PFX);
  77 }
  78
  79 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  80                                         struct ttm_placement *placement)
  81 {
  82         int i, ret, mem_type;
  83
  84         kprintf("No space for %p (%lu pages, %luK, %luM)\n",
  85                bo, bo->mem.num_pages, bo->mem.size >> 10,
  86                bo->mem.size >> 20);
  87         for (i = 0; i < placement->num_placement; i++) {
  88                 ret = ttm_mem_type_from_flags(placement->placement[i],
  89                                                 &mem_type);
  90                 if (ret)
  91                         return;
  92                 kprintf("  placement[%d]=0x%08X (%d)\n",
  93                        i, placement->placement[i], mem_type);
  94                 ttm_mem_type_debug(bo->bdev, mem_type);
  95         }
  96 }
  97
  98 #if 0
  99 static ssize_t ttm_bo_global_show(struct ttm_bo_global *glob,
 100     char *buffer)
 101 {
 102
 103         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 104                         (unsigned long) atomic_read(&glob->bo_count));
 105 }
 106 #endif
 107
 108 static inline uint32_t ttm_bo_type_flags(unsigned type)
 109 {
 110         return 1 << (type);
 111 }
 112
 113 static void ttm_bo_release_list(struct kref *list_kref)
 114 {
 115         struct ttm_buffer_object *bo =
 116             container_of(list_kref, struct ttm_buffer_object, list_kref);
 117         struct ttm_bo_device *bdev = bo->bdev;
 118         size_t acc_size = bo->acc_size;
 119
 120         BUG_ON(atomic_read(&bo->list_kref.refcount));
 121         BUG_ON(atomic_read(&bo->kref.refcount));
 122         BUG_ON(atomic_read(&bo->cpu_writers));
 123         BUG_ON(bo->sync_obj != NULL);
 124         BUG_ON(bo->mem.mm_node != NULL);
 125         BUG_ON(!list_empty(&bo->lru));
 126         BUG_ON(!list_empty(&bo->ddestroy));
 127
 128         if (bo->ttm)
 129                 ttm_tt_destroy(bo->ttm);
 130         atomic_dec(&bo->glob->bo_count);
 131         if (bo->destroy)
 132                 bo->destroy(bo);
 133         else {
 134                 kfree(bo, M_TTM_BO);
 135         }
 136         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 137 }
 138
 139 static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
 140                                   bool interruptible)
 141 {
 142         const char *wmsg;
 143         int flags, ret;
 144
 145         ret = 0;
 146         if (interruptible) {
 147                 flags = PCATCH;
 148                 wmsg = "ttbowi";
 149         } else {
 150                 flags = 0;
 151                 wmsg = "ttbowu";
 152         }
 153         while (ttm_bo_is_reserved(bo)) {
 154                 ret = -lksleep(bo, &bo->glob->lru_lock, 0, wmsg, 0);
 155                 if (ret != 0)
 156                         break;
 157         }
 158         return (ret);
 159 }
 160
 161 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 162 {
 163         struct ttm_bo_device *bdev = bo->bdev;
 164         struct ttm_mem_type_manager *man;
 165
 166         BUG_ON(!ttm_bo_is_reserved(bo));
 167
 168         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 169
 170                 BUG_ON(!list_empty(&bo->lru));
 171
 172                 man = &bdev->man[bo->mem.mem_type];
 173                 list_add_tail(&bo->lru, &man->lru);
 174                 kref_get(&bo->list_kref);
 175
 176                 if (bo->ttm != NULL) {
 177                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 178                         kref_get(&bo->list_kref);
 179                 }
 180         }
 181 }
 182
 183 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 184 {
 185         int put_count = 0;
 186
 187         if (!list_empty(&bo->swap)) {
 188                 list_del_init(&bo->swap);
 189                 ++put_count;
 190         }
 191         if (!list_empty(&bo->lru)) {
 192                 list_del_init(&bo->lru);
 193                 ++put_count;
 194         }
 195
 196         /*
 197          * TODO: Add a driver hook to delete from
 198          * driver-specific LRU's here.
 199          */
 200
 201         return put_count;
 202 }
 203
 204 int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
 205                           bool interruptible,
 206                           bool no_wait, bool use_sequence, uint32_t sequence)
 207 {
 208         int ret;
 209
 210         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 211                 /**
 212                  * Deadlock avoidance for multi-bo reserving.
 213                  */
 214                 if (use_sequence && bo->seq_valid) {
 215                         /**
 216                          * We've already reserved this one.
 217                          */
 218                         if (unlikely(sequence == bo->val_seq))
 219                                 return -EDEADLK;
 220                         /**
 221                          * Already reserved by a thread that will not back
 222                          * off for us. We need to back off.
 223                          */
 224                         if (unlikely(sequence - bo->val_seq < (1 << 31)))
 225                                 return -EAGAIN;
 226                 }
 227
 228                 if (no_wait)
 229                         return -EBUSY;
 230
 231                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 232
 233                 if (unlikely(ret))
 234                         return ret;
 235         }
 236
 237         if (use_sequence) {
 238                 bool wake_up = false;
 239                 /**
 240                  * Wake up waiters that may need to recheck for deadlock,
 241                  * if we decreased the sequence number.
 242                  */
 243                 if (unlikely((bo->val_seq - sequence < (1 << 31))
 244                              || !bo->seq_valid))
 245                         wake_up = true;
 246
 247                 /*
 248                  * In the worst case with memory ordering these values can be
 249                  * seen in the wrong order. However since we call wake_up_all
 250                  * in that case, this will hopefully not pose a problem,
 251                  * and the worst case would only cause someone to accidentally
 252                  * hit -EAGAIN in ttm_bo_reserve when they see old value of
 253                  * val_seq. However this would only happen if seq_valid was
 254                  * written before val_seq was, and just means some slightly
 255                  * increased cpu usage
 256                  */
 257                 bo->val_seq = sequence;
 258                 bo->seq_valid = true;
 259                 if (wake_up)
 260                         wakeup(bo);
 261         } else {
 262                 bo->seq_valid = false;
 263         }
 264
 265         return 0;
 266 }
 267 EXPORT_SYMBOL(ttm_bo_reserve);
 268
 269 static void ttm_bo_ref_bug(struct kref *list_kref)
 270 {
 271         BUG();
 272 }
 273
 274 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 275                          bool never_free)
 276 {
 277         kref_sub(&bo->list_kref, count,
 278                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 279 }
 280
 281 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 282                    bool interruptible,
 283                    bool no_wait, bool use_sequence, uint32_t sequence)
 284 {
 285         struct ttm_bo_global *glob = bo->glob;
 286         int put_count = 0;
 287         int ret;
 288
 289         ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_sequence,
 290                                    sequence);
 291         if (likely(ret == 0)) {
 292                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 293                 put_count = ttm_bo_del_from_lru(bo);
 294                 lockmgr(&glob->lru_lock, LK_RELEASE);
 295                 ttm_bo_list_ref_sub(bo, put_count, true);
 296         }
 297
 298         return ret;
 299 }
 300
 301 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
 302                                   bool interruptible, uint32_t sequence)
 303 {
 304         bool wake_up = false;
 305         int ret;
 306
 307         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 308                 WARN_ON(bo->seq_valid && sequence == bo->val_seq);
 309
 310                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 311
 312                 if (unlikely(ret))
 313                         return ret;
 314         }
 315
 316         if ((bo->val_seq - sequence < (1 << 31)) || !bo->seq_valid)
 317                 wake_up = true;
 318
 319         /**
 320          * Wake up waiters that may need to recheck for deadlock,
 321          * if we decreased the sequence number.
 322          */
 323         bo->val_seq = sequence;
 324         bo->seq_valid = true;
 325         if (wake_up)
 326                 wakeup(bo);
 327
 328         return 0;
 329 }
 330
 331 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 332                             bool interruptible, uint32_t sequence)
 333 {
 334         struct ttm_bo_global *glob = bo->glob;
 335         int put_count, ret;
 336
 337         ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, sequence);
 338         if (likely(!ret)) {
 339                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 340                 put_count = ttm_bo_del_from_lru(bo);
 341                 lockmgr(&glob->lru_lock, LK_RELEASE);
 342                 ttm_bo_list_ref_sub(bo, put_count, true);
 343         }
 344         return ret;
 345 }
 346 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
 347
 348 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
 349 {
 350         ttm_bo_add_to_lru(bo);
 351         atomic_set(&bo->reserved, 0);
 352         wakeup(bo);
 353 }
 354
 355 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 356 {
 357         struct ttm_bo_global *glob = bo->glob;
 358
 359         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 360         ttm_bo_unreserve_locked(bo);
 361         lockmgr(&glob->lru_lock, LK_RELEASE);
 362 }
 363 EXPORT_SYMBOL(ttm_bo_unreserve);
 364
 365 /*
 366  * Call bo->mutex locked.
 367  */
 368 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 369 {
 370         struct ttm_bo_device *bdev = bo->bdev;
 371         struct ttm_bo_global *glob = bo->glob;
 372         int ret = 0;
 373         uint32_t page_flags = 0;
 374
 375         TTM_ASSERT_LOCKED(&bo->mutex);
 376         bo->ttm = NULL;
 377
 378         if (bdev->need_dma32)
 379                 page_flags |= TTM_PAGE_FLAG_DMA32;
 380
 381         switch (bo->type) {
 382         case ttm_bo_type_device:
 383                 if (zero_alloc)
 384                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 385         case ttm_bo_type_kernel:
 386                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 387                                                       page_flags, glob->dummy_read_page);
 388                 if (unlikely(bo->ttm == NULL))
 389                         ret = -ENOMEM;
 390                 break;
 391         case ttm_bo_type_sg:
 392                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 393                                                       page_flags | TTM_PAGE_FLAG_SG,
 394                                                       glob->dummy_read_page);
 395                 if (unlikely(bo->ttm == NULL)) {
 396                         ret = -ENOMEM;
 397                         break;
 398                 }
 399                 bo->ttm->sg = bo->sg;
 400                 break;
 401         default:
 402                 kprintf("[TTM] Illegal buffer object type\n");
 403                 ret = -EINVAL;
 404                 break;
 405         }
 406
 407         return ret;
 408 }
 409
 410 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 411                                   struct ttm_mem_reg *mem,
 412                                   bool evict, bool interruptible,
 413                                   bool no_wait_gpu)
 414 {
 415         struct ttm_bo_device *bdev = bo->bdev;
 416         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 417         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 418         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 419         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 420         int ret = 0;
 421
 422         if (old_is_pci || new_is_pci ||
 423             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 424                 ret = ttm_mem_io_lock(old_man, true);
 425                 if (unlikely(ret != 0))
 426                         goto out_err;
 427                 ttm_bo_unmap_virtual_locked(bo);
 428                 ttm_mem_io_unlock(old_man);
 429         }
 430
 431         /*
 432          * Create and bind a ttm if required.
 433          */
 434
 435         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 436                 if (bo->ttm == NULL) {
 437                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 438                         ret = ttm_bo_add_ttm(bo, zero);
 439                         if (ret)
 440                                 goto out_err;
 441                 }
 442
 443                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 444                 if (ret)
 445                         goto out_err;
 446
 447                 if (mem->mem_type != TTM_PL_SYSTEM) {
 448                         ret = ttm_tt_bind(bo->ttm, mem);
 449                         if (ret)
 450                                 goto out_err;
 451                 }
 452
 453                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 454                         if (bdev->driver->move_notify)
 455                                 bdev->driver->move_notify(bo, mem);
 456                         bo->mem = *mem;
 457                         mem->mm_node = NULL;
 458                         goto moved;
 459                 }
 460         }
 461
 462         if (bdev->driver->move_notify)
 463                 bdev->driver->move_notify(bo, mem);
 464
 465         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 466             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 467                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 468         else if (bdev->driver->move)
 469                 ret = bdev->driver->move(bo, evict, interruptible,
 470                                          no_wait_gpu, mem);
 471         else
 472                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 473
 474         if (ret) {
 475                 if (bdev->driver->move_notify) {
 476                         struct ttm_mem_reg tmp_mem = *mem;
 477                         *mem = bo->mem;
 478                         bo->mem = tmp_mem;
 479                         bdev->driver->move_notify(bo, mem);
 480                         bo->mem = *mem;
 481                         *mem = tmp_mem;
 482                 }
 483
 484                 goto out_err;
 485         }
 486
 487 moved:
 488         if (bo->evicted) {
 489                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 490                 if (ret)
 491                         kprintf("[TTM] Can not flush read caches\n");
 492                 bo->evicted = false;
 493         }
 494
 495         if (bo->mem.mm_node) {
 496                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 497                     bdev->man[bo->mem.mem_type].gpu_offset;
 498                 bo->cur_placement = bo->mem.placement;
 499         } else
 500                 bo->offset = 0;
 501
 502         return 0;
 503
 504 out_err:
 505         new_man = &bdev->man[bo->mem.mem_type];
 506         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 507                 ttm_tt_unbind(bo->ttm);
 508                 ttm_tt_destroy(bo->ttm);
 509                 bo->ttm = NULL;
 510         }
 511
 512         return ret;
 513 }
 514
 515 /**
 516  * Call bo::reserved.
 517  * Will release GPU memory type usage on destruction.
 518  * This is the place to put in driver specific hooks to release
 519  * driver private resources.
 520  * Will release the bo::reserved lock.
 521  */
 522
 523 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 524 {
 525         if (bo->bdev->driver->move_notify)
 526                 bo->bdev->driver->move_notify(bo, NULL);
 527
 528         if (bo->ttm) {
 529                 ttm_tt_unbind(bo->ttm);
 530                 ttm_tt_destroy(bo->ttm);
 531                 bo->ttm = NULL;
 532         }
 533         ttm_bo_mem_put(bo, &bo->mem);
 534
 535         atomic_set(&bo->reserved, 0);
 536         wakeup(&bo);
 537
 538         /*
 539          * Since the final reference to this bo may not be dropped by
 540          * the current task we have to put a memory barrier here to make
 541          * sure the changes done in this function are always visible.
 542          *
 543          * This function only needs protection against the final kref_put.
 544          */
 545         cpu_mfence();
 546 }
 547
 548 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 549 {
 550         struct ttm_bo_device *bdev = bo->bdev;
 551         struct ttm_bo_global *glob = bo->glob;
 552         struct ttm_bo_driver *driver = bdev->driver;
 553         void *sync_obj = NULL;
 554         int put_count;
 555         int ret;
 556
 557         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 558         ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 559
 560         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 561         (void) ttm_bo_wait(bo, false, false, true);
 562         if (!ret && !bo->sync_obj) {
 563                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 564                 put_count = ttm_bo_del_from_lru(bo);
 565
 566                 lockmgr(&glob->lru_lock, LK_RELEASE);
 567                 ttm_bo_cleanup_memtype_use(bo);
 568
 569                 ttm_bo_list_ref_sub(bo, put_count, true);
 570
 571                 return;
 572         }
 573         if (bo->sync_obj)
 574                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 575         lockmgr(&bdev->fence_lock, LK_RELEASE);
 576
 577         if (!ret) {
 578                 atomic_set(&bo->reserved, 0);
 579                 wakeup(bo);
 580         }
 581
 582         kref_get(&bo->list_kref);
 583         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 584         lockmgr(&glob->lru_lock, LK_RELEASE);
 585
 586         if (sync_obj) {
 587                 driver->sync_obj_flush(sync_obj);
 588                 driver->sync_obj_unref(&sync_obj);
 589         }
 590         taskqueue_enqueue_timeout(taskqueue_thread[mycpuid], &bdev->wq,
 591             ((hz / 100) < 1) ? 1 : hz / 100);
 592 }
 593
 594 /**
 595  * function ttm_bo_cleanup_refs_and_unlock
 596  * If bo idle, remove from delayed- and lru lists, and unref.
 597  * If not idle, do nothing.
 598  *
 599  * Must be called with lru_lock and reservation held, this function
 600  * will drop both before returning.
 601  *
 602  * @interruptible         Any sleeps should occur interruptibly.
 603  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 604  */
 605
 606 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 607                                           bool interruptible,
 608                                           bool no_wait_gpu)
 609 {
 610         struct ttm_bo_device *bdev = bo->bdev;
 611         struct ttm_bo_driver *driver = bdev->driver;
 612         struct ttm_bo_global *glob = bo->glob;
 613         int put_count;
 614         int ret;
 615
 616         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 617         ret = ttm_bo_wait(bo, false, false, true);
 618
 619         if (ret && !no_wait_gpu) {
 620                 void *sync_obj;
 621
 622                 /*
 623                  * Take a reference to the fence and unreserve,
 624                  * at this point the buffer should be dead, so
 625                  * no new sync objects can be attached.
 626                  */
 627                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 628                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 629
 630                 atomic_set(&bo->reserved, 0);
 631                 wakeup(bo);
 632                 lockmgr(&glob->lru_lock, LK_RELEASE);
 633
 634                 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
 635                 driver->sync_obj_unref(&sync_obj);
 636                 if (ret)
 637                         return ret;
 638
 639                 /*
 640                  * remove sync_obj with ttm_bo_wait, the wait should be
 641                  * finished, and no new wait object should have been added.
 642                  */
 643                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 644                 ret = ttm_bo_wait(bo, false, false, true);
 645                 WARN_ON(ret);
 646                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 647                 if (ret)
 648                         return ret;
 649
 650                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 651                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 652
 653                 /*
 654                  * We raced, and lost, someone else holds the reservation now,
 655                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 656                  *
 657                  * Even if it's not the case, because we finished waiting any
 658                  * delayed destruction would succeed, so just return success
 659                  * here.
 660                  */
 661                 if (ret) {
 662                         lockmgr(&glob->lru_lock, LK_RELEASE);
 663                         return 0;
 664                 }
 665         } else
 666                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 667
 668         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 669                 atomic_set(&bo->reserved, 0);
 670                 wakeup(bo);
 671                 lockmgr(&glob->lru_lock, LK_RELEASE);
 672                 return ret;
 673         }
 674
 675         put_count = ttm_bo_del_from_lru(bo);
 676         list_del_init(&bo->ddestroy);
 677         ++put_count;
 678
 679         lockmgr(&glob->lru_lock, LK_RELEASE);
 680         ttm_bo_cleanup_memtype_use(bo);
 681
 682         ttm_bo_list_ref_sub(bo, put_count, true);
 683
 684         return 0;
 685 }
 686
 687 /**
 688  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 689  * encountered buffers.
 690  */
 691
 692 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 693 {
 694         struct ttm_bo_global *glob = bdev->glob;
 695         struct ttm_buffer_object *entry = NULL;
 696         int ret = 0;
 697
 698         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 699         if (list_empty(&bdev->ddestroy))
 700                 goto out_unlock;
 701
 702         entry = list_first_entry(&bdev->ddestroy,
 703                 struct ttm_buffer_object, ddestroy);
 704         kref_get(&entry->list_kref);
 705
 706         for (;;) {
 707                 struct ttm_buffer_object *nentry = NULL;
 708
 709                 if (entry->ddestroy.next != &bdev->ddestroy) {
 710                         nentry = list_first_entry(&entry->ddestroy,
 711                                 struct ttm_buffer_object, ddestroy);
 712                         kref_get(&nentry->list_kref);
 713                 }
 714
 715                 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
 716                 if (remove_all && ret) {
 717                         lockmgr(&glob->lru_lock, LK_RELEASE);
 718                         ret = ttm_bo_reserve_nolru(entry, false, false,
 719                                                    false, 0);
 720                         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 721                 }
 722
 723                 if (!ret)
 724                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 725                                                              !remove_all);
 726                 else
 727                         lockmgr(&glob->lru_lock, LK_RELEASE);
 728
 729                 kref_put(&entry->list_kref, ttm_bo_release_list);
 730                 entry = nentry;
 731
 732                 if (ret || !entry)
 733                         goto out;
 734
 735                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 736                 if (list_empty(&entry->ddestroy))
 737                         break;
 738         }
 739
 740 out_unlock:
 741         lockmgr(&glob->lru_lock, LK_RELEASE);
 742 out:
 743         if (entry)
 744                 kref_put(&entry->list_kref, ttm_bo_release_list);
 745         return ret;
 746 }
 747
 748 static void ttm_bo_delayed_workqueue(void *arg, int pending __unused)
 749 {
 750         struct ttm_bo_device *bdev = arg;
 751
 752         if (ttm_bo_delayed_delete(bdev, false)) {
 753                 taskqueue_enqueue_timeout(taskqueue_thread[mycpuid], &bdev->wq,
 754                     ((hz / 100) < 1) ? 1 : hz / 100);
 755         }
 756 }
 757
 758 static void ttm_bo_release(struct kref *kref)
 759 {
 760         struct ttm_buffer_object *bo =
 761             container_of(kref, struct ttm_buffer_object, kref);
 762         struct ttm_bo_device *bdev = bo->bdev;
 763         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 764
 765         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
 766         if (likely(bo->vm_node != NULL)) {
 767                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 768                 drm_mm_put_block(bo->vm_node);
 769                 bo->vm_node = NULL;
 770         }
 771         lockmgr(&bdev->vm_lock, LK_RELEASE);
 772         ttm_mem_io_lock(man, false);
 773         ttm_mem_io_free_vm(bo);
 774         ttm_mem_io_unlock(man);
 775         ttm_bo_cleanup_refs_or_queue(bo);
 776         kref_put(&bo->list_kref, ttm_bo_release_list);
 777 }
 778
 779 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 780 {
 781         struct ttm_buffer_object *bo = *p_bo;
 782
 783         *p_bo = NULL;
 784         kref_put(&bo->kref, ttm_bo_release);
 785 }
 786 EXPORT_SYMBOL(ttm_bo_unref);
 787
 788 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 789 {
 790         int pending;
 791
 792         taskqueue_cancel_timeout(taskqueue_thread[mycpuid], &bdev->wq, &pending);
 793         if (pending)
 794                 taskqueue_drain_timeout(taskqueue_thread[mycpuid], &bdev->wq);
 795         return (pending);
 796 }
 797 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 798
 799 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 800 {
 801         if (resched) {
 802                 taskqueue_enqueue_timeout(taskqueue_thread[mycpuid], &bdev->wq,
 803                     ((hz / 100) < 1) ? 1 : hz / 100);
 804         }
 805 }
 806 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 807
 808 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 809                         bool no_wait_gpu)
 810 {
 811         struct ttm_bo_device *bdev = bo->bdev;
 812         struct ttm_mem_reg evict_mem;
 813         struct ttm_placement placement;
 814         int ret = 0;
 815
 816         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 817         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 818         lockmgr(&bdev->fence_lock, LK_RELEASE);
 819
 820         if (unlikely(ret != 0)) {
 821                 if (ret != -ERESTART) {
 822                         kprintf("[TTM] Failed to expire sync object before buffer eviction\n");
 823                 }
 824                 goto out;
 825         }
 826
 827         BUG_ON(!ttm_bo_is_reserved(bo));
 828
 829         evict_mem = bo->mem;
 830         evict_mem.mm_node = NULL;
 831         evict_mem.bus.io_reserved_vm = false;
 832         evict_mem.bus.io_reserved_count = 0;
 833
 834         placement.fpfn = 0;
 835         placement.lpfn = 0;
 836         placement.num_placement = 0;
 837         placement.num_busy_placement = 0;
 838         bdev->driver->evict_flags(bo, &placement);
 839         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 840                                 no_wait_gpu);
 841         if (ret) {
 842                 if (ret != -ERESTART) {
 843                         kprintf("[TTM] Failed to find memory space for buffer 0x%p eviction\n",
 844                                bo);
 845                         ttm_bo_mem_space_debug(bo, &placement);
 846                 }
 847                 goto out;
 848         }
 849
 850         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 851                                      no_wait_gpu);
 852         if (ret) {
 853                 if (ret != -ERESTART)
 854                         kprintf("[TTM] Buffer eviction failed\n");
 855                 ttm_bo_mem_put(bo, &evict_mem);
 856                 goto out;
 857         }
 858         bo->evicted = true;
 859 out:
 860         return ret;
 861 }
 862
 863 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 864                                 uint32_t mem_type,
 865                                 bool interruptible,
 866                                 bool no_wait_gpu)
 867 {
 868         struct ttm_bo_global *glob = bdev->glob;
 869         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 870         struct ttm_buffer_object *bo;
 871         int ret = -EBUSY, put_count;
 872
 873         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 874         list_for_each_entry(bo, &man->lru, lru) {
 875                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 876                 if (!ret)
 877                         break;
 878         }
 879
 880         if (ret) {
 881                 lockmgr(&glob->lru_lock, LK_RELEASE);
 882                 return ret;
 883         }
 884
 885         kref_get(&bo->list_kref);
 886
 887         if (!list_empty(&bo->ddestroy)) {
 888                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 889                                                      no_wait_gpu);
 890                 kref_put(&bo->list_kref, ttm_bo_release_list);
 891                 return ret;
 892         }
 893
 894         put_count = ttm_bo_del_from_lru(bo);
 895         lockmgr(&glob->lru_lock, LK_RELEASE);
 896
 897         BUG_ON(ret != 0);
 898
 899         ttm_bo_list_ref_sub(bo, put_count, true);
 900
 901         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 902         ttm_bo_unreserve(bo);
 903
 904         kref_put(&bo->list_kref, ttm_bo_release_list);
 905         return ret;
 906 }
 907
 908 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 909 {
 910         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 911
 912         if (mem->mm_node)
 913                 (*man->func->put_node)(man, mem);
 914 }
 915 EXPORT_SYMBOL(ttm_bo_mem_put);
 916
 917 /**
 918  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 919  * space, or we've evicted everything and there isn't enough space.
 920  */
 921 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 922                                         uint32_t mem_type,
 923                                         struct ttm_placement *placement,
 924                                         struct ttm_mem_reg *mem,
 925                                         bool interruptible,
 926                                         bool no_wait_gpu)
 927 {
 928         struct ttm_bo_device *bdev = bo->bdev;
 929         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 930         int ret;
 931
 932         do {
 933                 ret = (*man->func->get_node)(man, bo, placement, mem);
 934                 if (unlikely(ret != 0))
 935                         return ret;
 936                 if (mem->mm_node)
 937                         break;
 938                 ret = ttm_mem_evict_first(bdev, mem_type,
 939                                           interruptible, no_wait_gpu);
 940                 if (unlikely(ret != 0))
 941                         return ret;
 942         } while (1);
 943         if (mem->mm_node == NULL)
 944                 return -ENOMEM;
 945         mem->mem_type = mem_type;
 946         return 0;
 947 }
 948
 949 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 950                                       uint32_t cur_placement,
 951                                       uint32_t proposed_placement)
 952 {
 953         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 954         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 955
 956         /**
 957          * Keep current caching if possible.
 958          */
 959
 960         if ((cur_placement & caching) != 0)
 961                 result |= (cur_placement & caching);
 962         else if ((man->default_caching & caching) != 0)
 963                 result |= man->default_caching;
 964         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 965                 result |= TTM_PL_FLAG_CACHED;
 966         else if ((TTM_PL_FLAG_WC & caching) != 0)
 967                 result |= TTM_PL_FLAG_WC;
 968         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 969                 result |= TTM_PL_FLAG_UNCACHED;
 970
 971         return result;
 972 }
 973
 974 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 975                                  uint32_t mem_type,
 976                                  uint32_t proposed_placement,
 977                                  uint32_t *masked_placement)
 978 {
 979         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 980
 981         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 982                 return false;
 983
 984         if ((proposed_placement & man->available_caching) == 0)
 985                 return false;
 986
 987         cur_flags |= (proposed_placement & man->available_caching);
 988
 989         *masked_placement = cur_flags;
 990         return true;
 991 }
 992
 993 /**
 994  * Creates space for memory region @mem according to its type.
 995  *
 996  * This function first searches for free space in compatible memory types in
 997  * the priority order defined by the driver.  If free space isn't found, then
 998  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 999  * space.
1000  */
1001 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1002                         struct ttm_placement *placement,
1003                         struct ttm_mem_reg *mem,
1004                         bool interruptible,
1005                         bool no_wait_gpu)
1006 {
1007         struct ttm_bo_device *bdev = bo->bdev;
1008         struct ttm_mem_type_manager *man;
1009         uint32_t mem_type = TTM_PL_SYSTEM;
1010         uint32_t cur_flags = 0;
1011         bool type_found = false;
1012         bool type_ok = false;
1013         bool has_erestartsys = false;
1014         int i, ret;
1015
1016         mem->mm_node = NULL;
1017         for (i = 0; i < placement->num_placement; ++i) {
1018                 ret = ttm_mem_type_from_flags(placement->placement[i],
1019                                                 &mem_type);
1020                 if (ret)
1021                         return ret;
1022                 man = &bdev->man[mem_type];
1023
1024                 type_ok = ttm_bo_mt_compatible(man,
1025                                                 mem_type,
1026                                                 placement->placement[i],
1027                                                 &cur_flags);
1028
1029                 if (!type_ok)
1030                         continue;
1031
1032                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1033                                                   cur_flags);
1034                 /*
1035                  * Use the access and other non-mapping-related flag bits from
1036                  * the memory placement flags to the current flags
1037                  */
1038                 ttm_flag_masked(&cur_flags, placement->placement[i],
1039                                 ~TTM_PL_MASK_MEMTYPE);
1040
1041                 if (mem_type == TTM_PL_SYSTEM)
1042                         break;
1043
1044                 if (man->has_type && man->use_type) {
1045                         type_found = true;
1046                         ret = (*man->func->get_node)(man, bo, placement, mem);
1047                         if (unlikely(ret))
1048                                 return ret;
1049                 }
1050                 if (mem->mm_node)
1051                         break;
1052         }
1053
1054         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1055                 mem->mem_type = mem_type;
1056                 mem->placement = cur_flags;
1057                 return 0;
1058         }
1059
1060         if (!type_found)
1061                 return -EINVAL;
1062
1063         for (i = 0; i < placement->num_busy_placement; ++i) {
1064                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1065                                                 &mem_type);
1066                 if (ret)
1067                         return ret;
1068                 man = &bdev->man[mem_type];
1069                 if (!man->has_type)
1070                         continue;
1071                 if (!ttm_bo_mt_compatible(man,
1072                                                 mem_type,
1073                                                 placement->busy_placement[i],
1074                                                 &cur_flags))
1075                         continue;
1076
1077                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1078                                                   cur_flags);
1079                 /*
1080                  * Use the access and other non-mapping-related flag bits from
1081                  * the memory placement flags to the current flags
1082                  */
1083                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1084                                 ~TTM_PL_MASK_MEMTYPE);
1085
1086
1087                 if (mem_type == TTM_PL_SYSTEM) {
1088                         mem->mem_type = mem_type;
1089                         mem->placement = cur_flags;
1090                         mem->mm_node = NULL;
1091                         return 0;
1092                 }
1093
1094                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1095                                                 interruptible, no_wait_gpu);
1096                 if (ret == 0 && mem->mm_node) {
1097                         mem->placement = cur_flags;
1098                         return 0;
1099                 }
1100                 if (ret == -ERESTART)
1101                         has_erestartsys = true;
1102         }
1103         ret = (has_erestartsys) ? -ERESTART : -ENOMEM;
1104         return ret;
1105 }
1106 EXPORT_SYMBOL(ttm_bo_mem_space);
1107
1108 static
1109 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1110                         struct ttm_placement *placement,
1111                         bool interruptible,
1112                         bool no_wait_gpu)
1113 {
1114         int ret = 0;
1115         struct ttm_mem_reg mem;
1116         struct ttm_bo_device *bdev = bo->bdev;
1117
1118         BUG_ON(!ttm_bo_is_reserved(bo));
1119
1120         /*
1121          * FIXME: It's possible to pipeline buffer moves.
1122          * Have the driver move function wait for idle when necessary,
1123          * instead of doing it here.
1124          */
1125         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1126         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1127         lockmgr(&bdev->fence_lock, LK_RELEASE);
1128         if (ret)
1129                 return ret;
1130         mem.num_pages = bo->num_pages;
1131         mem.size = mem.num_pages << PAGE_SHIFT;
1132         mem.page_alignment = bo->mem.page_alignment;
1133         mem.bus.io_reserved_vm = false;
1134         mem.bus.io_reserved_count = 0;
1135         /*
1136          * Determine where to move the buffer.
1137          */
1138         ret = ttm_bo_mem_space(bo, placement, &mem,
1139                                interruptible, no_wait_gpu);
1140         if (ret)
1141                 goto out_unlock;
1142         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1143                                      interruptible, no_wait_gpu);
1144 out_unlock:
1145         if (ret && mem.mm_node)
1146                 ttm_bo_mem_put(bo, &mem);
1147         return ret;
1148 }
1149
1150 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1151                              struct ttm_mem_reg *mem)
1152 {
1153         int i;
1154
1155         if (mem->mm_node && placement->lpfn != 0 &&
1156             (mem->start < placement->fpfn ||
1157              mem->start + mem->num_pages > placement->lpfn))
1158                 return -1;
1159
1160         for (i = 0; i < placement->num_placement; i++) {
1161                 if ((placement->placement[i] & mem->placement &
1162                         TTM_PL_MASK_CACHING) &&
1163                         (placement->placement[i] & mem->placement &
1164                         TTM_PL_MASK_MEM))
1165                         return i;
1166         }
1167         return -1;
1168 }
1169
1170 int ttm_bo_validate(struct ttm_buffer_object *bo,
1171                         struct ttm_placement *placement,
1172                         bool interruptible,
1173                         bool no_wait_gpu)
1174 {
1175         int ret;
1176
1177         BUG_ON(!ttm_bo_is_reserved(bo));
1178         /* Check that range is valid */
1179         if (placement->lpfn || placement->fpfn)
1180                 if (placement->fpfn > placement->lpfn ||
1181                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1182                         return -EINVAL;
1183         /*
1184          * Check whether we need to move buffer.
1185          */
1186         ret = ttm_bo_mem_compat(placement, &bo->mem);
1187         if (ret < 0) {
1188                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1189                                          no_wait_gpu);
1190                 if (ret)
1191                         return ret;
1192         } else {
1193                 /*
1194                  * Use the access and other non-mapping-related flag bits from
1195                  * the compatible memory placement flags to the active flags
1196                  */
1197                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1198                                 ~TTM_PL_MASK_MEMTYPE);
1199         }
1200         /*
1201          * We might need to add a TTM.
1202          */
1203         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1204                 ret = ttm_bo_add_ttm(bo, true);
1205                 if (ret)
1206                         return ret;
1207         }
1208         return 0;
1209 }
1210 EXPORT_SYMBOL(ttm_bo_validate);
1211
1212 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1213                                 struct ttm_placement *placement)
1214 {
1215         BUG_ON((placement->fpfn || placement->lpfn) &&
1216                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1217
1218         return 0;
1219 }
1220
1221 int ttm_bo_init(struct ttm_bo_device *bdev,
1222                 struct ttm_buffer_object *bo,
1223                 unsigned long size,
1224                 enum ttm_bo_type type,
1225                 struct ttm_placement *placement,
1226                 uint32_t page_alignment,
1227                 bool interruptible,
1228                 struct vm_object *persistent_swap_storage,
1229                 size_t acc_size,
1230                 struct sg_table *sg,
1231                 void (*destroy) (struct ttm_buffer_object *))
1232 {
1233         int ret = 0;
1234         unsigned long num_pages;
1235         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1236
1237         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1238         if (ret) {
1239                 kprintf("[TTM] Out of kernel memory\n");
1240                 if (destroy)
1241                         (*destroy)(bo);
1242                 else
1243                         kfree(bo, M_TTM_BO);
1244                 return -ENOMEM;
1245         }
1246
1247         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1248         if (num_pages == 0) {
1249                 kprintf("[TTM] Illegal buffer object size\n");
1250                 if (destroy)
1251                         (*destroy)(bo);
1252                 else
1253                         kfree(bo, M_TTM_BO);
1254                 ttm_mem_global_free(mem_glob, acc_size);
1255                 return -EINVAL;
1256         }
1257         bo->destroy = destroy;
1258
1259         kref_init(&bo->kref);
1260         kref_init(&bo->list_kref);
1261         atomic_set(&bo->cpu_writers, 0);
1262         atomic_set(&bo->reserved, 1);
1263         INIT_LIST_HEAD(&bo->lru);
1264         INIT_LIST_HEAD(&bo->ddestroy);
1265         INIT_LIST_HEAD(&bo->swap);
1266         INIT_LIST_HEAD(&bo->io_reserve_lru);
1267         bo->bdev = bdev;
1268         bo->glob = bdev->glob;
1269         bo->type = type;
1270         bo->num_pages = num_pages;
1271         bo->mem.size = num_pages << PAGE_SHIFT;
1272         bo->mem.mem_type = TTM_PL_SYSTEM;
1273         bo->mem.num_pages = bo->num_pages;
1274         bo->mem.mm_node = NULL;
1275         bo->mem.page_alignment = page_alignment;
1276         bo->mem.bus.io_reserved_vm = false;
1277         bo->mem.bus.io_reserved_count = 0;
1278         bo->priv_flags = 0;
1279         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1280         bo->seq_valid = false;
1281         bo->persistent_swap_storage = persistent_swap_storage;
1282         bo->acc_size = acc_size;
1283         bo->sg = sg;
1284         atomic_inc(&bo->glob->bo_count);
1285
1286         ret = ttm_bo_check_placement(bo, placement);
1287         if (unlikely(ret != 0))
1288                 goto out_err;
1289
1290         /*
1291          * For ttm_bo_type_device buffers, allocate
1292          * address space from the device.
1293          */
1294         if (bo->type == ttm_bo_type_device ||
1295             bo->type == ttm_bo_type_sg) {
1296                 ret = ttm_bo_setup_vm(bo);
1297                 if (ret)
1298                         goto out_err;
1299         }
1300
1301         ret = ttm_bo_validate(bo, placement, interruptible, false);
1302         if (ret)
1303                 goto out_err;
1304
1305         ttm_bo_unreserve(bo);
1306         return 0;
1307
1308 out_err:
1309         ttm_bo_unreserve(bo);
1310         ttm_bo_unref(&bo);
1311
1312         return ret;
1313 }
1314 EXPORT_SYMBOL(ttm_bo_init);
1315
1316 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1317                        unsigned long bo_size,
1318                        unsigned struct_size)
1319 {
1320         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1321         size_t size = 0;
1322
1323         size += ttm_round_pot(struct_size);
1324         size += PAGE_ALIGN(npages * sizeof(void *));
1325         size += ttm_round_pot(sizeof(struct ttm_tt));
1326         return size;
1327 }
1328 EXPORT_SYMBOL(ttm_bo_acc_size);
1329
1330 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1331                            unsigned long bo_size,
1332                            unsigned struct_size)
1333 {
1334         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1335         size_t size = 0;
1336
1337         size += ttm_round_pot(struct_size);
1338         size += PAGE_ALIGN(npages * sizeof(void *));
1339         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1340         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1341         return size;
1342 }
1343 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1344
1345 int ttm_bo_create(struct ttm_bo_device *bdev,
1346                         unsigned long size,
1347                         enum ttm_bo_type type,
1348                         struct ttm_placement *placement,
1349                         uint32_t page_alignment,
1350                         bool interruptible,
1351                         struct vm_object *persistent_swap_storage,
1352                         struct ttm_buffer_object **p_bo)
1353 {
1354         struct ttm_buffer_object *bo;
1355         size_t acc_size;
1356         int ret;
1357
1358         bo = kmalloc(sizeof(*bo), M_TTM_BO, M_WAITOK | M_ZERO);
1359         if (unlikely(bo == NULL))
1360                 return -ENOMEM;
1361
1362         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1363         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1364                           interruptible, persistent_swap_storage, acc_size,
1365                           NULL, NULL);
1366         if (likely(ret == 0))
1367                 *p_bo = bo;
1368
1369         return ret;
1370 }
1371 EXPORT_SYMBOL(ttm_bo_create);
1372
1373 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1374                                         unsigned mem_type, bool allow_errors)
1375 {
1376         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1377         struct ttm_bo_global *glob = bdev->glob;
1378         int ret;
1379
1380         /*
1381          * Can't use standard list traversal since we're unlocking.
1382          */
1383
1384         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1385         while (!list_empty(&man->lru)) {
1386                 lockmgr(&glob->lru_lock, LK_RELEASE);
1387                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1388                 if (ret) {
1389                         if (allow_errors) {
1390                                 return ret;
1391                         } else {
1392                                 kprintf("[TTM] Cleanup eviction failed\n");
1393                         }
1394                 }
1395                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1396         }
1397         lockmgr(&glob->lru_lock, LK_RELEASE);
1398         return 0;
1399 }
1400
1401 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1402 {
1403         struct ttm_mem_type_manager *man;
1404         int ret = -EINVAL;
1405
1406         if (mem_type >= TTM_NUM_MEM_TYPES) {
1407                 kprintf("[TTM] Illegal memory type %d\n", mem_type);
1408                 return ret;
1409         }
1410         man = &bdev->man[mem_type];
1411
1412         if (!man->has_type) {
1413                 kprintf("[TTM] Trying to take down uninitialized memory manager type %u\n",
1414                        mem_type);
1415                 return ret;
1416         }
1417
1418         man->use_type = false;
1419         man->has_type = false;
1420
1421         ret = 0;
1422         if (mem_type > 0) {
1423                 ttm_bo_force_list_clean(bdev, mem_type, false);
1424
1425                 ret = (*man->func->takedown)(man);
1426         }
1427
1428         return ret;
1429 }
1430 EXPORT_SYMBOL(ttm_bo_clean_mm);
1431
1432 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1433 {
1434         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1435
1436         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1437                 kprintf("[TTM] Illegal memory manager memory type %u\n", mem_type);
1438                 return -EINVAL;
1439         }
1440
1441         if (!man->has_type) {
1442                 kprintf("[TTM] Memory type %u has not been initialized\n", mem_type);
1443                 return 0;
1444         }
1445
1446         return ttm_bo_force_list_clean(bdev, mem_type, true);
1447 }
1448 EXPORT_SYMBOL(ttm_bo_evict_mm);
1449
1450 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1451                         unsigned long p_size)
1452 {
1453         int ret = -EINVAL;
1454         struct ttm_mem_type_manager *man;
1455
1456         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1457         man = &bdev->man[type];
1458         BUG_ON(man->has_type);
1459         man->io_reserve_fastpath = true;
1460         man->use_io_reserve_lru = false;
1461         lockinit(&man->io_reserve_mutex, "ttmman", 0, LK_CANRECURSE);
1462         INIT_LIST_HEAD(&man->io_reserve_lru);
1463
1464         ret = bdev->driver->init_mem_type(bdev, type, man);
1465         if (ret)
1466                 return ret;
1467         man->bdev = bdev;
1468
1469         ret = 0;
1470         if (type != TTM_PL_SYSTEM) {
1471                 ret = (*man->func->init)(man, p_size);
1472                 if (ret)
1473                         return ret;
1474         }
1475         man->has_type = true;
1476         man->use_type = true;
1477         man->size = p_size;
1478
1479         INIT_LIST_HEAD(&man->lru);
1480
1481         return 0;
1482 }
1483 EXPORT_SYMBOL(ttm_bo_init_mm);
1484
1485 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob)
1486 {
1487
1488         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1489         vm_page_free(glob->dummy_read_page);
1490 }
1491
1492 void ttm_bo_global_release(struct drm_global_reference *ref)
1493 {
1494         struct ttm_bo_global *glob = ref->object;
1495
1496         if (refcount_release(&glob->kobj_ref))
1497                 ttm_bo_global_kobj_release(glob);
1498 }
1499 EXPORT_SYMBOL(ttm_bo_global_release);
1500
1501 int ttm_bo_global_init(struct drm_global_reference *ref)
1502 {
1503         struct ttm_bo_global_ref *bo_ref =
1504                 container_of(ref, struct ttm_bo_global_ref, ref);
1505         struct ttm_bo_global *glob = ref->object;
1506         int ret;
1507
1508         lockinit(&glob->device_list_mutex, "ttmdlm", 0, LK_CANRECURSE);
1509         lockinit(&glob->lru_lock, "ttmlru", 0, LK_CANRECURSE);
1510         glob->mem_glob = bo_ref->mem_glob;
1511         glob->dummy_read_page = vm_page_alloc_contig(
1512             0, VM_MAX_ADDRESS, PAGE_SIZE, 0, 1*PAGE_SIZE, VM_MEMATTR_UNCACHEABLE);
1513
1514         if (unlikely(glob->dummy_read_page == NULL)) {
1515                 ret = -ENOMEM;
1516                 goto out_no_drp;
1517         }
1518
1519         INIT_LIST_HEAD(&glob->swap_lru);
1520         INIT_LIST_HEAD(&glob->device_list);
1521
1522         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1523         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1524         if (unlikely(ret != 0)) {
1525                 kprintf("[TTM] Could not register buffer object swapout\n");
1526                 goto out_no_shrink;
1527         }
1528
1529         atomic_set(&glob->bo_count, 0);
1530
1531         refcount_init(&glob->kobj_ref, 1);
1532         return (0);
1533
1534 out_no_shrink:
1535         vm_page_free(glob->dummy_read_page);
1536 out_no_drp:
1537         kfree(glob, M_DRM_GLOBAL);
1538         return ret;
1539 }
1540 EXPORT_SYMBOL(ttm_bo_global_init);
1541
1542
1543 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1544 {
1545         int ret = 0;
1546         unsigned i = TTM_NUM_MEM_TYPES;
1547         struct ttm_mem_type_manager *man;
1548         struct ttm_bo_global *glob = bdev->glob;
1549
1550         while (i--) {
1551                 man = &bdev->man[i];
1552                 if (man->has_type) {
1553                         man->use_type = false;
1554                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1555                                 ret = -EBUSY;
1556                                 kprintf("[TTM] DRM memory manager type %d is not clean\n",
1557                                        i);
1558                         }
1559                         man->has_type = false;
1560                 }
1561         }
1562
1563         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1564         list_del(&bdev->device_list);
1565         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1566
1567         if (taskqueue_cancel_timeout(taskqueue_thread[mycpuid], &bdev->wq, NULL))
1568                 taskqueue_drain_timeout(taskqueue_thread[mycpuid], &bdev->wq);
1569
1570         while (ttm_bo_delayed_delete(bdev, true))
1571                 ;
1572
1573         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1574         if (list_empty(&bdev->ddestroy))
1575                 TTM_DEBUG("Delayed destroy list was clean\n");
1576
1577         if (list_empty(&bdev->man[0].lru))
1578                 TTM_DEBUG("Swap list was clean\n");
1579         lockmgr(&glob->lru_lock, LK_RELEASE);
1580
1581         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1582         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1583         drm_mm_takedown(&bdev->addr_space_mm);
1584         lockmgr(&bdev->vm_lock, LK_RELEASE);
1585
1586         return ret;
1587 }
1588 EXPORT_SYMBOL(ttm_bo_device_release);
1589
1590 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1591                        struct ttm_bo_global *glob,
1592                        struct ttm_bo_driver *driver,
1593                        uint64_t file_page_offset,
1594                        bool need_dma32)
1595 {
1596         int ret = -EINVAL;
1597
1598         lockinit(&bdev->vm_lock, "ttmvml", 0, LK_CANRECURSE);
1599         bdev->driver = driver;
1600
1601         memset(bdev->man, 0, sizeof(bdev->man));
1602
1603         /*
1604          * Initialize the system memory buffer type.
1605          * Other types need to be driver / IOCTL initialized.
1606          */
1607         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1608         if (unlikely(ret != 0))
1609                 goto out_no_sys;
1610
1611         bdev->addr_space_rb = RB_ROOT;
1612         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1613         if (unlikely(ret != 0))
1614                 goto out_no_addr_mm;
1615
1616         TIMEOUT_TASK_INIT(taskqueue_thread[mycpuid], &bdev->wq, 0,
1617             ttm_bo_delayed_workqueue, bdev);
1618         INIT_LIST_HEAD(&bdev->ddestroy);
1619         bdev->dev_mapping = NULL;
1620         bdev->glob = glob;
1621         bdev->need_dma32 = need_dma32;
1622         bdev->val_seq = 0;
1623         lockinit(&bdev->fence_lock, "ttmfence", 0, LK_CANRECURSE);
1624         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1625         list_add_tail(&bdev->device_list, &glob->device_list);
1626         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1627
1628         return 0;
1629 out_no_addr_mm:
1630         ttm_bo_clean_mm(bdev, 0);
1631 out_no_sys:
1632         return ret;
1633 }
1634 EXPORT_SYMBOL(ttm_bo_device_init);
1635
1636 /*
1637  * buffer object vm functions.
1638  */
1639
1640 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1641 {
1642         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1643
1644         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1645                 if (mem->mem_type == TTM_PL_SYSTEM)
1646                         return false;
1647
1648                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1649                         return false;
1650
1651                 if (mem->placement & TTM_PL_FLAG_CACHED)
1652                         return false;
1653         }
1654         return true;
1655 }
1656
1657 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1658 {
1659
1660         ttm_bo_release_mmap(bo);
1661         ttm_mem_io_free_vm(bo);
1662 }
1663
1664 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1665 {
1666         struct ttm_bo_device *bdev = bo->bdev;
1667         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1668
1669         ttm_mem_io_lock(man, false);
1670         ttm_bo_unmap_virtual_locked(bo);
1671         ttm_mem_io_unlock(man);
1672 }
1673
1674
1675 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1676
1677 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1678 {
1679         struct ttm_bo_device *bdev = bo->bdev;
1680         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1681         struct rb_node *parent = NULL;
1682         struct ttm_buffer_object *cur_bo;
1683         unsigned long offset = bo->vm_node->start;
1684         unsigned long cur_offset;
1685
1686         while (*cur) {
1687                 parent = *cur;
1688                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1689                 cur_offset = cur_bo->vm_node->start;
1690                 if (offset < cur_offset)
1691                         cur = &parent->rb_left;
1692                 else if (offset > cur_offset)
1693                         cur = &parent->rb_right;
1694                 else
1695                         BUG();
1696         }
1697
1698         rb_link_node(&bo->vm_rb, parent, cur);
1699         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1700 }
1701
1702 /**
1703  * ttm_bo_setup_vm:
1704  *
1705  * @bo: the buffer to allocate address space for
1706  *
1707  * Allocate address space in the drm device so that applications
1708  * can mmap the buffer and access the contents. This only
1709  * applies to ttm_bo_type_device objects as others are not
1710  * placed in the drm device address space.
1711  */
1712
1713 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1714 {
1715         struct ttm_bo_device *bdev = bo->bdev;
1716         int ret;
1717
1718 retry_pre_get:
1719         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1720         if (unlikely(ret != 0))
1721                 return ret;
1722
1723         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1724         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1725                                          bo->mem.num_pages, 0, 0);
1726
1727         if (unlikely(bo->vm_node == NULL)) {
1728                 ret = -ENOMEM;
1729                 goto out_unlock;
1730         }
1731
1732         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1733                                               bo->mem.num_pages, 0);
1734
1735         if (unlikely(bo->vm_node == NULL)) {
1736                 lockmgr(&bdev->vm_lock, LK_RELEASE);
1737                 goto retry_pre_get;
1738         }
1739
1740         ttm_bo_vm_insert_rb(bo);
1741         lockmgr(&bdev->vm_lock, LK_RELEASE);
1742         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1743
1744         return 0;
1745 out_unlock:
1746         lockmgr(&bdev->vm_lock, LK_RELEASE);
1747         return ret;
1748 }
1749
1750 int ttm_bo_wait(struct ttm_buffer_object *bo,
1751                 bool lazy, bool interruptible, bool no_wait)
1752 {
1753         struct ttm_bo_driver *driver = bo->bdev->driver;
1754         struct ttm_bo_device *bdev = bo->bdev;
1755         void *sync_obj;
1756         int ret = 0;
1757
1758         if (likely(bo->sync_obj == NULL))
1759                 return 0;
1760
1761         while (bo->sync_obj) {
1762
1763                 if (driver->sync_obj_signaled(bo->sync_obj)) {
1764                         void *tmp_obj = bo->sync_obj;
1765                         bo->sync_obj = NULL;
1766                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1767                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1768                         driver->sync_obj_unref(&tmp_obj);
1769                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1770                         continue;
1771                 }
1772
1773                 if (no_wait)
1774                         return -EBUSY;
1775
1776                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1777                 lockmgr(&bdev->fence_lock, LK_RELEASE);
1778                 ret = driver->sync_obj_wait(sync_obj,
1779                                             lazy, interruptible);
1780                 if (unlikely(ret != 0)) {
1781                         driver->sync_obj_unref(&sync_obj);
1782                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1783                         return ret;
1784                 }
1785                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1786                 if (likely(bo->sync_obj == sync_obj)) {
1787                         void *tmp_obj = bo->sync_obj;
1788                         bo->sync_obj = NULL;
1789                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1790                                   &bo->priv_flags);
1791                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1792                         driver->sync_obj_unref(&sync_obj);
1793                         driver->sync_obj_unref(&tmp_obj);
1794                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1795                 } else {
1796                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1797                         driver->sync_obj_unref(&sync_obj);
1798                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1799                 }
1800         }
1801         return 0;
1802 }
1803 EXPORT_SYMBOL(ttm_bo_wait);
1804
1805 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1806 {
1807         struct ttm_bo_device *bdev = bo->bdev;
1808         int ret = 0;
1809
1810         /*
1811          * Using ttm_bo_reserve makes sure the lru lists are updated.
1812          */
1813
1814         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1815         if (unlikely(ret != 0))
1816                 return ret;
1817         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1818         ret = ttm_bo_wait(bo, false, true, no_wait);
1819         lockmgr(&bdev->fence_lock, LK_RELEASE);
1820         if (likely(ret == 0))
1821                 atomic_inc(&bo->cpu_writers);
1822         ttm_bo_unreserve(bo);
1823         return ret;
1824 }
1825 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1826
1827 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1828 {
1829         atomic_dec(&bo->cpu_writers);
1830 }
1831 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1832
1833 /**
1834  * A buffer object shrink method that tries to swap out the first
1835  * buffer object on the bo_global::swap_lru list.
1836  */
1837
1838 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1839 {
1840         struct ttm_bo_global *glob =
1841             container_of(shrink, struct ttm_bo_global, shrink);
1842         struct ttm_buffer_object *bo;
1843         int ret = -EBUSY;
1844         int put_count;
1845         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1846
1847         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1848         list_for_each_entry(bo, &glob->swap_lru, swap) {
1849                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1850                 if (!ret)
1851                         break;
1852         }
1853
1854         if (ret) {
1855                 lockmgr(&glob->lru_lock, LK_RELEASE);
1856                 return ret;
1857         }
1858
1859         kref_get(&bo->list_kref);
1860
1861         if (!list_empty(&bo->ddestroy)) {
1862                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1863                 kref_put(&bo->list_kref, ttm_bo_release_list);
1864                 return ret;
1865         }
1866
1867         put_count = ttm_bo_del_from_lru(bo);
1868         lockmgr(&glob->lru_lock, LK_RELEASE);
1869
1870         ttm_bo_list_ref_sub(bo, put_count, true);
1871
1872         /**
1873          * Wait for GPU, then move to system cached.
1874          */
1875
1876         lockmgr(&bo->bdev->fence_lock, LK_EXCLUSIVE);
1877         ret = ttm_bo_wait(bo, false, false, false);
1878         lockmgr(&bo->bdev->fence_lock, LK_RELEASE);
1879
1880         if (unlikely(ret != 0))
1881                 goto out;
1882
1883         if ((bo->mem.placement & swap_placement) != swap_placement) {
1884                 struct ttm_mem_reg evict_mem;
1885
1886                 evict_mem = bo->mem;
1887                 evict_mem.mm_node = NULL;
1888                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1889                 evict_mem.mem_type = TTM_PL_SYSTEM;
1890
1891                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1892                                              false, false);
1893                 if (unlikely(ret != 0))
1894                         goto out;
1895         }
1896
1897         ttm_bo_unmap_virtual(bo);
1898
1899         /**
1900          * Swap out. Buffer will be swapped in again as soon as
1901          * anyone tries to access a ttm page.
1902          */
1903
1904         if (bo->bdev->driver->swap_notify)
1905                 bo->bdev->driver->swap_notify(bo);
1906
1907         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1908 out:
1909
1910         /**
1911          *
1912          * Unreserve without putting on LRU to avoid swapping out an
1913          * already swapped buffer.
1914          */
1915
1916         atomic_set(&bo->reserved, 0);
1917         wakeup(bo);
1918         kref_put(&bo->list_kref, ttm_bo_release_list);
1919         return ret;
1920 }
1921
1922 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1923 {
1924         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1925                 ;
1926 }
1927 EXPORT_SYMBOL(ttm_bo_swapout_all);