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 #include <linux/wait.h>
  42
  43 #define TTM_ASSERT_LOCKED(param)
  44 #define TTM_DEBUG(fmt, arg...)
  45 #define TTM_BO_HASH_ORDER 13
  46
  47 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  48 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  49 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob);
  50
  51 MALLOC_DEFINE(M_TTM_BO, "ttm_bo", "TTM Buffer Objects");
  52
  53 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  54 {
  55         int i;
  56
  57         for (i = 0; i <= TTM_PL_PRIV5; i++)
  58                 if (flags & (1 << i)) {
  59                         *mem_type = i;
  60                         return 0;
  61                 }
  62         return -EINVAL;
  63 }
  64
  65 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  66 {
  67         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  68
  69         kprintf("    has_type: %d\n", man->has_type);
  70         kprintf("    use_type: %d\n", man->use_type);
  71         kprintf("    flags: 0x%08X\n", man->flags);
  72         kprintf("    gpu_offset: 0x%08lX\n", man->gpu_offset);
  73         kprintf("    size: %ju\n", (uintmax_t)man->size);
  74         kprintf("    available_caching: 0x%08X\n", man->available_caching);
  75         kprintf("    default_caching: 0x%08X\n", man->default_caching);
  76         if (mem_type != TTM_PL_SYSTEM)
  77                 (*man->func->debug)(man, TTM_PFX);
  78 }
  79
  80 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  81                                         struct ttm_placement *placement)
  82 {
  83         int i, ret, mem_type;
  84
  85         kprintf("No space for %p (%lu pages, %luK, %luM)\n",
  86                bo, bo->mem.num_pages, bo->mem.size >> 10,
  87                bo->mem.size >> 20);
  88         for (i = 0; i < placement->num_placement; i++) {
  89                 ret = ttm_mem_type_from_flags(placement->placement[i],
  90                                                 &mem_type);
  91                 if (ret)
  92                         return;
  93                 kprintf("  placement[%d]=0x%08X (%d)\n",
  94                        i, placement->placement[i], mem_type);
  95                 ttm_mem_type_debug(bo->bdev, mem_type);
  96         }
  97 }
  98
  99 #if 0
 100 static ssize_t ttm_bo_global_show(struct ttm_bo_global *glob,
 101     char *buffer)
 102 {
 103
 104         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 105                         (unsigned long) atomic_read(&glob->bo_count));
 106 }
 107 #endif
 108
 109 static inline uint32_t ttm_bo_type_flags(unsigned type)
 110 {
 111         return 1 << (type);
 112 }
 113
 114 static void ttm_bo_release_list(struct kref *list_kref)
 115 {
 116         struct ttm_buffer_object *bo =
 117             container_of(list_kref, struct ttm_buffer_object, list_kref);
 118         struct ttm_bo_device *bdev = bo->bdev;
 119         size_t acc_size = bo->acc_size;
 120
 121         BUG_ON(atomic_read(&bo->list_kref.refcount));
 122         BUG_ON(atomic_read(&bo->kref.refcount));
 123         BUG_ON(atomic_read(&bo->cpu_writers));
 124         BUG_ON(bo->sync_obj != NULL);
 125         BUG_ON(bo->mem.mm_node != NULL);
 126         BUG_ON(!list_empty(&bo->lru));
 127         BUG_ON(!list_empty(&bo->ddestroy));
 128
 129         if (bo->ttm)
 130                 ttm_tt_destroy(bo->ttm);
 131         atomic_dec(&bo->glob->bo_count);
 132         if (bo->destroy)
 133                 bo->destroy(bo);
 134         else {
 135                 kfree(bo, M_TTM_BO);
 136         }
 137         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 138 }
 139
 140 static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
 141                                   bool interruptible)
 142 {
 143         const char *wmsg;
 144         int flags, ret;
 145
 146         ret = 0;
 147         if (interruptible) {
 148                 flags = PCATCH;
 149                 wmsg = "ttbowi";
 150         } else {
 151                 flags = 0;
 152                 wmsg = "ttbowu";
 153         }
 154         while (ttm_bo_is_reserved(bo)) {
 155                 ret = -lksleep(bo, &bo->glob->lru_lock, 0, wmsg, 0);
 156                 if (ret != 0)
 157                         break;
 158         }
 159         return (ret);
 160 }
 161
 162 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 163 {
 164         struct ttm_bo_device *bdev = bo->bdev;
 165         struct ttm_mem_type_manager *man;
 166
 167         BUG_ON(!ttm_bo_is_reserved(bo));
 168
 169         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 170
 171                 BUG_ON(!list_empty(&bo->lru));
 172
 173                 man = &bdev->man[bo->mem.mem_type];
 174                 list_add_tail(&bo->lru, &man->lru);
 175                 kref_get(&bo->list_kref);
 176
 177                 if (bo->ttm != NULL) {
 178                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 179                         kref_get(&bo->list_kref);
 180                 }
 181         }
 182 }
 183
 184 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 185 {
 186         int put_count = 0;
 187
 188         if (!list_empty(&bo->swap)) {
 189                 list_del_init(&bo->swap);
 190                 ++put_count;
 191         }
 192         if (!list_empty(&bo->lru)) {
 193                 list_del_init(&bo->lru);
 194                 ++put_count;
 195         }
 196
 197         /*
 198          * TODO: Add a driver hook to delete from
 199          * driver-specific LRU's here.
 200          */
 201
 202         return put_count;
 203 }
 204
 205 int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
 206                           bool interruptible,
 207                           bool no_wait, bool use_sequence, uint32_t sequence)
 208 {
 209         int ret;
 210
 211         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 212                 /**
 213                  * Deadlock avoidance for multi-bo reserving.
 214                  */
 215                 if (use_sequence && bo->seq_valid) {
 216                         /**
 217                          * We've already reserved this one.
 218                          */
 219                         if (unlikely(sequence == bo->val_seq))
 220                                 return -EDEADLK;
 221                         /**
 222                          * Already reserved by a thread that will not back
 223                          * off for us. We need to back off.
 224                          */
 225                         if (unlikely(sequence - bo->val_seq < (1 << 31)))
 226                                 return -EAGAIN;
 227                 }
 228
 229                 if (no_wait)
 230                         return -EBUSY;
 231
 232                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 233
 234                 if (unlikely(ret))
 235                         return ret;
 236         }
 237
 238         if (use_sequence) {
 239                 bool wake_up = false;
 240                 /**
 241                  * Wake up waiters that may need to recheck for deadlock,
 242                  * if we decreased the sequence number.
 243                  */
 244                 if (unlikely((bo->val_seq - sequence < (1 << 31))
 245                              || !bo->seq_valid))
 246                         wake_up = true;
 247
 248                 /*
 249                  * In the worst case with memory ordering these values can be
 250                  * seen in the wrong order. However since we call wake_up_all
 251                  * in that case, this will hopefully not pose a problem,
 252                  * and the worst case would only cause someone to accidentally
 253                  * hit -EAGAIN in ttm_bo_reserve when they see old value of
 254                  * val_seq. However this would only happen if seq_valid was
 255                  * written before val_seq was, and just means some slightly
 256                  * increased cpu usage
 257                  */
 258                 bo->val_seq = sequence;
 259                 bo->seq_valid = true;
 260                 if (wake_up)
 261                         wake_up_all(&bo->event_queue);
 262         } else {
 263                 bo->seq_valid = false;
 264         }
 265
 266         return 0;
 267 }
 268 EXPORT_SYMBOL(ttm_bo_reserve);
 269
 270 static void ttm_bo_ref_bug(struct kref *list_kref)
 271 {
 272         BUG();
 273 }
 274
 275 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 276                          bool never_free)
 277 {
 278         kref_sub(&bo->list_kref, count,
 279                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 280 }
 281
 282 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 283                    bool interruptible,
 284                    bool no_wait, bool use_sequence, uint32_t sequence)
 285 {
 286         struct ttm_bo_global *glob = bo->glob;
 287         int put_count = 0;
 288         int ret;
 289
 290         ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_sequence,
 291                                    sequence);
 292         if (likely(ret == 0)) {
 293                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 294                 put_count = ttm_bo_del_from_lru(bo);
 295                 lockmgr(&glob->lru_lock, LK_RELEASE);
 296                 ttm_bo_list_ref_sub(bo, put_count, true);
 297         }
 298
 299         return ret;
 300 }
 301
 302 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
 303                                   bool interruptible, uint32_t sequence)
 304 {
 305         bool wake_up = false;
 306         int ret;
 307
 308         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 309                 WARN_ON(bo->seq_valid && sequence == bo->val_seq);
 310
 311                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 312
 313                 if (unlikely(ret))
 314                         return ret;
 315         }
 316
 317         if ((bo->val_seq - sequence < (1 << 31)) || !bo->seq_valid)
 318                 wake_up = true;
 319
 320         /**
 321          * Wake up waiters that may need to recheck for deadlock,
 322          * if we decreased the sequence number.
 323          */
 324         bo->val_seq = sequence;
 325         bo->seq_valid = true;
 326         if (wake_up)
 327                 wake_up_all(&bo->event_queue);
 328
 329         return 0;
 330 }
 331
 332 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 333                             bool interruptible, uint32_t sequence)
 334 {
 335         struct ttm_bo_global *glob = bo->glob;
 336         int put_count, ret;
 337
 338         ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, sequence);
 339         if (likely(!ret)) {
 340                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 341                 put_count = ttm_bo_del_from_lru(bo);
 342                 lockmgr(&glob->lru_lock, LK_RELEASE);
 343                 ttm_bo_list_ref_sub(bo, put_count, true);
 344         }
 345         return ret;
 346 }
 347 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
 348
 349 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
 350 {
 351         ttm_bo_add_to_lru(bo);
 352         atomic_set(&bo->reserved, 0);
 353         wake_up_all(&bo->event_queue);
 354 }
 355
 356 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 357 {
 358         struct ttm_bo_global *glob = bo->glob;
 359
 360         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 361         ttm_bo_unreserve_locked(bo);
 362         lockmgr(&glob->lru_lock, LK_RELEASE);
 363 }
 364 EXPORT_SYMBOL(ttm_bo_unreserve);
 365
 366 /*
 367  * Call bo->mutex locked.
 368  */
 369 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 370 {
 371         struct ttm_bo_device *bdev = bo->bdev;
 372         struct ttm_bo_global *glob = bo->glob;
 373         int ret = 0;
 374         uint32_t page_flags = 0;
 375
 376         TTM_ASSERT_LOCKED(&bo->mutex);
 377         bo->ttm = NULL;
 378
 379         if (bdev->need_dma32)
 380                 page_flags |= TTM_PAGE_FLAG_DMA32;
 381
 382         switch (bo->type) {
 383         case ttm_bo_type_device:
 384                 if (zero_alloc)
 385                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 386         case ttm_bo_type_kernel:
 387                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 388                                                       page_flags, glob->dummy_read_page);
 389                 if (unlikely(bo->ttm == NULL))
 390                         ret = -ENOMEM;
 391                 break;
 392         case ttm_bo_type_sg:
 393                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 394                                                       page_flags | TTM_PAGE_FLAG_SG,
 395                                                       glob->dummy_read_page);
 396                 if (unlikely(bo->ttm == NULL)) {
 397                         ret = -ENOMEM;
 398                         break;
 399                 }
 400                 bo->ttm->sg = bo->sg;
 401                 break;
 402         default:
 403                 kprintf("[TTM] Illegal buffer object type\n");
 404                 ret = -EINVAL;
 405                 break;
 406         }
 407
 408         return ret;
 409 }
 410
 411 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 412                                   struct ttm_mem_reg *mem,
 413                                   bool evict, bool interruptible,
 414                                   bool no_wait_gpu)
 415 {
 416         struct ttm_bo_device *bdev = bo->bdev;
 417         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 418         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 419         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 420         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 421         int ret = 0;
 422
 423         if (old_is_pci || new_is_pci ||
 424             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 425                 ret = ttm_mem_io_lock(old_man, true);
 426                 if (unlikely(ret != 0))
 427                         goto out_err;
 428                 ttm_bo_unmap_virtual_locked(bo);
 429                 ttm_mem_io_unlock(old_man);
 430         }
 431
 432         /*
 433          * Create and bind a ttm if required.
 434          */
 435
 436         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 437                 if (bo->ttm == NULL) {
 438                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 439                         ret = ttm_bo_add_ttm(bo, zero);
 440                         if (ret)
 441                                 goto out_err;
 442                 }
 443
 444                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 445                 if (ret)
 446                         goto out_err;
 447
 448                 if (mem->mem_type != TTM_PL_SYSTEM) {
 449                         ret = ttm_tt_bind(bo->ttm, mem);
 450                         if (ret)
 451                                 goto out_err;
 452                 }
 453
 454                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 455                         if (bdev->driver->move_notify)
 456                                 bdev->driver->move_notify(bo, mem);
 457                         bo->mem = *mem;
 458                         mem->mm_node = NULL;
 459                         goto moved;
 460                 }
 461         }
 462
 463         if (bdev->driver->move_notify)
 464                 bdev->driver->move_notify(bo, mem);
 465
 466         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 467             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 468                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 469         else if (bdev->driver->move)
 470                 ret = bdev->driver->move(bo, evict, interruptible,
 471                                          no_wait_gpu, mem);
 472         else
 473                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 474
 475         if (ret) {
 476                 if (bdev->driver->move_notify) {
 477                         struct ttm_mem_reg tmp_mem = *mem;
 478                         *mem = bo->mem;
 479                         bo->mem = tmp_mem;
 480                         bdev->driver->move_notify(bo, mem);
 481                         bo->mem = *mem;
 482                         *mem = tmp_mem;
 483                 }
 484
 485                 goto out_err;
 486         }
 487
 488 moved:
 489         if (bo->evicted) {
 490                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 491                 if (ret)
 492                         kprintf("[TTM] Can not flush read caches\n");
 493                 bo->evicted = false;
 494         }
 495
 496         if (bo->mem.mm_node) {
 497                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 498                     bdev->man[bo->mem.mem_type].gpu_offset;
 499                 bo->cur_placement = bo->mem.placement;
 500         } else
 501                 bo->offset = 0;
 502
 503         return 0;
 504
 505 out_err:
 506         new_man = &bdev->man[bo->mem.mem_type];
 507         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 508                 ttm_tt_unbind(bo->ttm);
 509                 ttm_tt_destroy(bo->ttm);
 510                 bo->ttm = NULL;
 511         }
 512
 513         return ret;
 514 }
 515
 516 /**
 517  * Call bo::reserved.
 518  * Will release GPU memory type usage on destruction.
 519  * This is the place to put in driver specific hooks to release
 520  * driver private resources.
 521  * Will release the bo::reserved lock.
 522  */
 523
 524 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 525 {
 526         if (bo->bdev->driver->move_notify)
 527                 bo->bdev->driver->move_notify(bo, NULL);
 528
 529         if (bo->ttm) {
 530                 ttm_tt_unbind(bo->ttm);
 531                 ttm_tt_destroy(bo->ttm);
 532                 bo->ttm = NULL;
 533         }
 534         ttm_bo_mem_put(bo, &bo->mem);
 535
 536         atomic_set(&bo->reserved, 0);
 537         wake_up_all(&bo->event_queue);
 538
 539         /*
 540          * Since the final reference to this bo may not be dropped by
 541          * the current task we have to put a memory barrier here to make
 542          * sure the changes done in this function are always visible.
 543          *
 544          * This function only needs protection against the final kref_put.
 545          */
 546         cpu_mfence();
 547 }
 548
 549 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 550 {
 551         struct ttm_bo_device *bdev = bo->bdev;
 552         struct ttm_bo_global *glob = bo->glob;
 553         struct ttm_bo_driver *driver = bdev->driver;
 554         void *sync_obj = NULL;
 555         int put_count;
 556         int ret;
 557
 558         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 559         ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 560
 561         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 562         (void) ttm_bo_wait(bo, false, false, true);
 563         if (!ret && !bo->sync_obj) {
 564                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 565                 put_count = ttm_bo_del_from_lru(bo);
 566
 567                 lockmgr(&glob->lru_lock, LK_RELEASE);
 568                 ttm_bo_cleanup_memtype_use(bo);
 569
 570                 ttm_bo_list_ref_sub(bo, put_count, true);
 571
 572                 return;
 573         }
 574         if (bo->sync_obj)
 575                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 576         lockmgr(&bdev->fence_lock, LK_RELEASE);
 577
 578         if (!ret) {
 579                 atomic_set(&bo->reserved, 0);
 580                 wake_up_all(&bo->event_queue);
 581         }
 582
 583         kref_get(&bo->list_kref);
 584         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 585         lockmgr(&glob->lru_lock, LK_RELEASE);
 586
 587         if (sync_obj) {
 588                 driver->sync_obj_flush(sync_obj);
 589                 driver->sync_obj_unref(&sync_obj);
 590         }
 591         taskqueue_enqueue_timeout(taskqueue_thread[mycpuid], &bdev->wq,
 592             ((hz / 100) < 1) ? 1 : hz / 100);
 593 }
 594
 595 /**
 596  * function ttm_bo_cleanup_refs_and_unlock
 597  * If bo idle, remove from delayed- and lru lists, and unref.
 598  * If not idle, do nothing.
 599  *
 600  * Must be called with lru_lock and reservation held, this function
 601  * will drop both before returning.
 602  *
 603  * @interruptible         Any sleeps should occur interruptibly.
 604  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 605  */
 606
 607 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 608                                           bool interruptible,
 609                                           bool no_wait_gpu)
 610 {
 611         struct ttm_bo_device *bdev = bo->bdev;
 612         struct ttm_bo_driver *driver = bdev->driver;
 613         struct ttm_bo_global *glob = bo->glob;
 614         int put_count;
 615         int ret;
 616
 617         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 618         ret = ttm_bo_wait(bo, false, false, true);
 619
 620         if (ret && !no_wait_gpu) {
 621                 void *sync_obj;
 622
 623                 /*
 624                  * Take a reference to the fence and unreserve,
 625                  * at this point the buffer should be dead, so
 626                  * no new sync objects can be attached.
 627                  */
 628                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 629                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 630
 631                 atomic_set(&bo->reserved, 0);
 632                 wake_up_all(&bo->event_queue);
 633                 lockmgr(&glob->lru_lock, LK_RELEASE);
 634
 635                 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
 636                 driver->sync_obj_unref(&sync_obj);
 637                 if (ret)
 638                         return ret;
 639
 640                 /*
 641                  * remove sync_obj with ttm_bo_wait, the wait should be
 642                  * finished, and no new wait object should have been added.
 643                  */
 644                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 645                 ret = ttm_bo_wait(bo, false, false, true);
 646                 WARN_ON(ret);
 647                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 648                 if (ret)
 649                         return ret;
 650
 651                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 652                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 653
 654                 /*
 655                  * We raced, and lost, someone else holds the reservation now,
 656                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 657                  *
 658                  * Even if it's not the case, because we finished waiting any
 659                  * delayed destruction would succeed, so just return success
 660                  * here.
 661                  */
 662                 if (ret) {
 663                         lockmgr(&glob->lru_lock, LK_RELEASE);
 664                         return 0;
 665                 }
 666         } else
 667                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 668
 669         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 670                 atomic_set(&bo->reserved, 0);
 671                 wake_up_all(&bo->event_queue);
 672                 lockmgr(&glob->lru_lock, LK_RELEASE);
 673                 return ret;
 674         }
 675
 676         put_count = ttm_bo_del_from_lru(bo);
 677         list_del_init(&bo->ddestroy);
 678         ++put_count;
 679
 680         lockmgr(&glob->lru_lock, LK_RELEASE);
 681         ttm_bo_cleanup_memtype_use(bo);
 682
 683         ttm_bo_list_ref_sub(bo, put_count, true);
 684
 685         return 0;
 686 }
 687
 688 /**
 689  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 690  * encountered buffers.
 691  */
 692
 693 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 694 {
 695         struct ttm_bo_global *glob = bdev->glob;
 696         struct ttm_buffer_object *entry = NULL;
 697         int ret = 0;
 698
 699         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 700         if (list_empty(&bdev->ddestroy))
 701                 goto out_unlock;
 702
 703         entry = list_first_entry(&bdev->ddestroy,
 704                 struct ttm_buffer_object, ddestroy);
 705         kref_get(&entry->list_kref);
 706
 707         for (;;) {
 708                 struct ttm_buffer_object *nentry = NULL;
 709
 710                 if (entry->ddestroy.next != &bdev->ddestroy) {
 711                         nentry = list_first_entry(&entry->ddestroy,
 712                                 struct ttm_buffer_object, ddestroy);
 713                         kref_get(&nentry->list_kref);
 714                 }
 715
 716                 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
 717                 if (remove_all && ret) {
 718                         lockmgr(&glob->lru_lock, LK_RELEASE);
 719                         ret = ttm_bo_reserve_nolru(entry, false, false,
 720                                                    false, 0);
 721                         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 722                 }
 723
 724                 if (!ret)
 725                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 726                                                              !remove_all);
 727                 else
 728                         lockmgr(&glob->lru_lock, LK_RELEASE);
 729
 730                 kref_put(&entry->list_kref, ttm_bo_release_list);
 731                 entry = nentry;
 732
 733                 if (ret || !entry)
 734                         goto out;
 735
 736                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 737                 if (list_empty(&entry->ddestroy))
 738                         break;
 739         }
 740
 741 out_unlock:
 742         lockmgr(&glob->lru_lock, LK_RELEASE);
 743 out:
 744         if (entry)
 745                 kref_put(&entry->list_kref, ttm_bo_release_list);
 746         return ret;
 747 }
 748
 749 static void ttm_bo_delayed_workqueue(void *arg, int pending __unused)
 750 {
 751         struct ttm_bo_device *bdev = arg;
 752
 753         if (ttm_bo_delayed_delete(bdev, false)) {
 754                 taskqueue_enqueue_timeout(taskqueue_thread[mycpuid], &bdev->wq,
 755                     ((hz / 100) < 1) ? 1 : hz / 100);
 756         }
 757 }
 758
 759 static void ttm_bo_release(struct kref *kref)
 760 {
 761         struct ttm_buffer_object *bo =
 762             container_of(kref, struct ttm_buffer_object, kref);
 763         struct ttm_bo_device *bdev = bo->bdev;
 764         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 765
 766         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
 767         if (likely(bo->vm_node != NULL)) {
 768                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 769                 drm_mm_put_block(bo->vm_node);
 770                 bo->vm_node = NULL;
 771         }
 772         lockmgr(&bdev->vm_lock, LK_RELEASE);
 773         ttm_mem_io_lock(man, false);
 774         ttm_mem_io_free_vm(bo);
 775         ttm_mem_io_unlock(man);
 776         ttm_bo_cleanup_refs_or_queue(bo);
 777         kref_put(&bo->list_kref, ttm_bo_release_list);
 778 }
 779
 780 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 781 {
 782         struct ttm_buffer_object *bo = *p_bo;
 783
 784         *p_bo = NULL;
 785         kref_put(&bo->kref, ttm_bo_release);
 786 }
 787 EXPORT_SYMBOL(ttm_bo_unref);
 788
 789 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 790 {
 791         int pending;
 792
 793         taskqueue_cancel_timeout(taskqueue_thread[mycpuid], &bdev->wq, &pending);
 794         if (pending)
 795                 taskqueue_drain_timeout(taskqueue_thread[mycpuid], &bdev->wq);
 796         return (pending);
 797 }
 798 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 799
 800 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 801 {
 802         if (resched) {
 803                 taskqueue_enqueue_timeout(taskqueue_thread[mycpuid], &bdev->wq,
 804                     ((hz / 100) < 1) ? 1 : hz / 100);
 805         }
 806 }
 807 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 808
 809 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 810                         bool no_wait_gpu)
 811 {
 812         struct ttm_bo_device *bdev = bo->bdev;
 813         struct ttm_mem_reg evict_mem;
 814         struct ttm_placement placement;
 815         int ret = 0;
 816
 817         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 818         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 819         lockmgr(&bdev->fence_lock, LK_RELEASE);
 820
 821         if (unlikely(ret != 0)) {
 822                 if (ret != -ERESTART) {
 823                         kprintf("[TTM] Failed to expire sync object before buffer eviction\n");
 824                 }
 825                 goto out;
 826         }
 827
 828         BUG_ON(!ttm_bo_is_reserved(bo));
 829
 830         evict_mem = bo->mem;
 831         evict_mem.mm_node = NULL;
 832         evict_mem.bus.io_reserved_vm = false;
 833         evict_mem.bus.io_reserved_count = 0;
 834
 835         placement.fpfn = 0;
 836         placement.lpfn = 0;
 837         placement.num_placement = 0;
 838         placement.num_busy_placement = 0;
 839         bdev->driver->evict_flags(bo, &placement);
 840         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 841                                 no_wait_gpu);
 842         if (ret) {
 843                 if (ret != -ERESTART) {
 844                         kprintf("[TTM] Failed to find memory space for buffer 0x%p eviction\n",
 845                                bo);
 846                         ttm_bo_mem_space_debug(bo, &placement);
 847                 }
 848                 goto out;
 849         }
 850
 851         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 852                                      no_wait_gpu);
 853         if (ret) {
 854                 if (ret != -ERESTART)
 855                         kprintf("[TTM] Buffer eviction failed\n");
 856                 ttm_bo_mem_put(bo, &evict_mem);
 857                 goto out;
 858         }
 859         bo->evicted = true;
 860 out:
 861         return ret;
 862 }
 863
 864 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 865                                 uint32_t mem_type,
 866                                 bool interruptible,
 867                                 bool no_wait_gpu)
 868 {
 869         struct ttm_bo_global *glob = bdev->glob;
 870         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 871         struct ttm_buffer_object *bo;
 872         int ret = -EBUSY, put_count;
 873
 874         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 875         list_for_each_entry(bo, &man->lru, lru) {
 876                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 877                 if (!ret)
 878                         break;
 879         }
 880
 881         if (ret) {
 882                 lockmgr(&glob->lru_lock, LK_RELEASE);
 883                 return ret;
 884         }
 885
 886         kref_get(&bo->list_kref);
 887
 888         if (!list_empty(&bo->ddestroy)) {
 889                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 890                                                      no_wait_gpu);
 891                 kref_put(&bo->list_kref, ttm_bo_release_list);
 892                 return ret;
 893         }
 894
 895         put_count = ttm_bo_del_from_lru(bo);
 896         lockmgr(&glob->lru_lock, LK_RELEASE);
 897
 898         BUG_ON(ret != 0);
 899
 900         ttm_bo_list_ref_sub(bo, put_count, true);
 901
 902         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 903         ttm_bo_unreserve(bo);
 904
 905         kref_put(&bo->list_kref, ttm_bo_release_list);
 906         return ret;
 907 }
 908
 909 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 910 {
 911         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 912
 913         if (mem->mm_node)
 914                 (*man->func->put_node)(man, mem);
 915 }
 916 EXPORT_SYMBOL(ttm_bo_mem_put);
 917
 918 /**
 919  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 920  * space, or we've evicted everything and there isn't enough space.
 921  */
 922 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 923                                         uint32_t mem_type,
 924                                         struct ttm_placement *placement,
 925                                         struct ttm_mem_reg *mem,
 926                                         bool interruptible,
 927                                         bool no_wait_gpu)
 928 {
 929         struct ttm_bo_device *bdev = bo->bdev;
 930         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 931         int ret;
 932
 933         do {
 934                 ret = (*man->func->get_node)(man, bo, placement, mem);
 935                 if (unlikely(ret != 0))
 936                         return ret;
 937                 if (mem->mm_node)
 938                         break;
 939                 ret = ttm_mem_evict_first(bdev, mem_type,
 940                                           interruptible, no_wait_gpu);
 941                 if (unlikely(ret != 0))
 942                         return ret;
 943         } while (1);
 944         if (mem->mm_node == NULL)
 945                 return -ENOMEM;
 946         mem->mem_type = mem_type;
 947         return 0;
 948 }
 949
 950 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 951                                       uint32_t cur_placement,
 952                                       uint32_t proposed_placement)
 953 {
 954         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 955         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 956
 957         /**
 958          * Keep current caching if possible.
 959          */
 960
 961         if ((cur_placement & caching) != 0)
 962                 result |= (cur_placement & caching);
 963         else if ((man->default_caching & caching) != 0)
 964                 result |= man->default_caching;
 965         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 966                 result |= TTM_PL_FLAG_CACHED;
 967         else if ((TTM_PL_FLAG_WC & caching) != 0)
 968                 result |= TTM_PL_FLAG_WC;
 969         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 970                 result |= TTM_PL_FLAG_UNCACHED;
 971
 972         return result;
 973 }
 974
 975 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 976                                  uint32_t mem_type,
 977                                  uint32_t proposed_placement,
 978                                  uint32_t *masked_placement)
 979 {
 980         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 981
 982         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 983                 return false;
 984
 985         if ((proposed_placement & man->available_caching) == 0)
 986                 return false;
 987
 988         cur_flags |= (proposed_placement & man->available_caching);
 989
 990         *masked_placement = cur_flags;
 991         return true;
 992 }
 993
 994 /**
 995  * Creates space for memory region @mem according to its type.
 996  *
 997  * This function first searches for free space in compatible memory types in
 998  * the priority order defined by the driver.  If free space isn't found, then
 999  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1000  * space.
1001  */
1002 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1003                         struct ttm_placement *placement,
1004                         struct ttm_mem_reg *mem,
1005                         bool interruptible,
1006                         bool no_wait_gpu)
1007 {
1008         struct ttm_bo_device *bdev = bo->bdev;
1009         struct ttm_mem_type_manager *man;
1010         uint32_t mem_type = TTM_PL_SYSTEM;
1011         uint32_t cur_flags = 0;
1012         bool type_found = false;
1013         bool type_ok = false;
1014         bool has_erestartsys = false;
1015         int i, ret;
1016
1017         mem->mm_node = NULL;
1018         for (i = 0; i < placement->num_placement; ++i) {
1019                 ret = ttm_mem_type_from_flags(placement->placement[i],
1020                                                 &mem_type);
1021                 if (ret)
1022                         return ret;
1023                 man = &bdev->man[mem_type];
1024
1025                 type_ok = ttm_bo_mt_compatible(man,
1026                                                 mem_type,
1027                                                 placement->placement[i],
1028                                                 &cur_flags);
1029
1030                 if (!type_ok)
1031                         continue;
1032
1033                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1034                                                   cur_flags);
1035                 /*
1036                  * Use the access and other non-mapping-related flag bits from
1037                  * the memory placement flags to the current flags
1038                  */
1039                 ttm_flag_masked(&cur_flags, placement->placement[i],
1040                                 ~TTM_PL_MASK_MEMTYPE);
1041
1042                 if (mem_type == TTM_PL_SYSTEM)
1043                         break;
1044
1045                 if (man->has_type && man->use_type) {
1046                         type_found = true;
1047                         ret = (*man->func->get_node)(man, bo, placement, mem);
1048                         if (unlikely(ret))
1049                                 return ret;
1050                 }
1051                 if (mem->mm_node)
1052                         break;
1053         }
1054
1055         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1056                 mem->mem_type = mem_type;
1057                 mem->placement = cur_flags;
1058                 return 0;
1059         }
1060
1061         if (!type_found)
1062                 return -EINVAL;
1063
1064         for (i = 0; i < placement->num_busy_placement; ++i) {
1065                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1066                                                 &mem_type);
1067                 if (ret)
1068                         return ret;
1069                 man = &bdev->man[mem_type];
1070                 if (!man->has_type)
1071                         continue;
1072                 if (!ttm_bo_mt_compatible(man,
1073                                                 mem_type,
1074                                                 placement->busy_placement[i],
1075                                                 &cur_flags))
1076                         continue;
1077
1078                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1079                                                   cur_flags);
1080                 /*
1081                  * Use the access and other non-mapping-related flag bits from
1082                  * the memory placement flags to the current flags
1083                  */
1084                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1085                                 ~TTM_PL_MASK_MEMTYPE);
1086
1087
1088                 if (mem_type == TTM_PL_SYSTEM) {
1089                         mem->mem_type = mem_type;
1090                         mem->placement = cur_flags;
1091                         mem->mm_node = NULL;
1092                         return 0;
1093                 }
1094
1095                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1096                                                 interruptible, no_wait_gpu);
1097                 if (ret == 0 && mem->mm_node) {
1098                         mem->placement = cur_flags;
1099                         return 0;
1100                 }
1101                 if (ret == -ERESTART)
1102                         has_erestartsys = true;
1103         }
1104         ret = (has_erestartsys) ? -ERESTART : -ENOMEM;
1105         return ret;
1106 }
1107 EXPORT_SYMBOL(ttm_bo_mem_space);
1108
1109 static
1110 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1111                         struct ttm_placement *placement,
1112                         bool interruptible,
1113                         bool no_wait_gpu)
1114 {
1115         int ret = 0;
1116         struct ttm_mem_reg mem;
1117         struct ttm_bo_device *bdev = bo->bdev;
1118
1119         BUG_ON(!ttm_bo_is_reserved(bo));
1120
1121         /*
1122          * FIXME: It's possible to pipeline buffer moves.
1123          * Have the driver move function wait for idle when necessary,
1124          * instead of doing it here.
1125          */
1126         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1127         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1128         lockmgr(&bdev->fence_lock, LK_RELEASE);
1129         if (ret)
1130                 return ret;
1131         mem.num_pages = bo->num_pages;
1132         mem.size = mem.num_pages << PAGE_SHIFT;
1133         mem.page_alignment = bo->mem.page_alignment;
1134         mem.bus.io_reserved_vm = false;
1135         mem.bus.io_reserved_count = 0;
1136         /*
1137          * Determine where to move the buffer.
1138          */
1139         ret = ttm_bo_mem_space(bo, placement, &mem,
1140                                interruptible, no_wait_gpu);
1141         if (ret)
1142                 goto out_unlock;
1143         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1144                                      interruptible, no_wait_gpu);
1145 out_unlock:
1146         if (ret && mem.mm_node)
1147                 ttm_bo_mem_put(bo, &mem);
1148         return ret;
1149 }
1150
1151 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1152                              struct ttm_mem_reg *mem)
1153 {
1154         int i;
1155
1156         if (mem->mm_node && placement->lpfn != 0 &&
1157             (mem->start < placement->fpfn ||
1158              mem->start + mem->num_pages > placement->lpfn))
1159                 return -1;
1160
1161         for (i = 0; i < placement->num_placement; i++) {
1162                 if ((placement->placement[i] & mem->placement &
1163                         TTM_PL_MASK_CACHING) &&
1164                         (placement->placement[i] & mem->placement &
1165                         TTM_PL_MASK_MEM))
1166                         return i;
1167         }
1168         return -1;
1169 }
1170
1171 int ttm_bo_validate(struct ttm_buffer_object *bo,
1172                         struct ttm_placement *placement,
1173                         bool interruptible,
1174                         bool no_wait_gpu)
1175 {
1176         int ret;
1177
1178         BUG_ON(!ttm_bo_is_reserved(bo));
1179         /* Check that range is valid */
1180         if (placement->lpfn || placement->fpfn)
1181                 if (placement->fpfn > placement->lpfn ||
1182                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1183                         return -EINVAL;
1184         /*
1185          * Check whether we need to move buffer.
1186          */
1187         ret = ttm_bo_mem_compat(placement, &bo->mem);
1188         if (ret < 0) {
1189                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1190                                          no_wait_gpu);
1191                 if (ret)
1192                         return ret;
1193         } else {
1194                 /*
1195                  * Use the access and other non-mapping-related flag bits from
1196                  * the compatible memory placement flags to the active flags
1197                  */
1198                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1199                                 ~TTM_PL_MASK_MEMTYPE);
1200         }
1201         /*
1202          * We might need to add a TTM.
1203          */
1204         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1205                 ret = ttm_bo_add_ttm(bo, true);
1206                 if (ret)
1207                         return ret;
1208         }
1209         return 0;
1210 }
1211 EXPORT_SYMBOL(ttm_bo_validate);
1212
1213 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1214                                 struct ttm_placement *placement)
1215 {
1216         BUG_ON((placement->fpfn || placement->lpfn) &&
1217                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1218
1219         return 0;
1220 }
1221
1222 int ttm_bo_init(struct ttm_bo_device *bdev,
1223                 struct ttm_buffer_object *bo,
1224                 unsigned long size,
1225                 enum ttm_bo_type type,
1226                 struct ttm_placement *placement,
1227                 uint32_t page_alignment,
1228                 bool interruptible,
1229                 struct vm_object *persistent_swap_storage,
1230                 size_t acc_size,
1231                 struct sg_table *sg,
1232                 void (*destroy) (struct ttm_buffer_object *))
1233 {
1234         int ret = 0;
1235         unsigned long num_pages;
1236         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1237
1238         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1239         if (ret) {
1240                 kprintf("[TTM] Out of kernel memory\n");
1241                 if (destroy)
1242                         (*destroy)(bo);
1243                 else
1244                         kfree(bo, M_TTM_BO);
1245                 return -ENOMEM;
1246         }
1247
1248         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1249         if (num_pages == 0) {
1250                 kprintf("[TTM] Illegal buffer object size\n");
1251                 if (destroy)
1252                         (*destroy)(bo);
1253                 else
1254                         kfree(bo, M_TTM_BO);
1255                 ttm_mem_global_free(mem_glob, acc_size);
1256                 return -EINVAL;
1257         }
1258         bo->destroy = destroy;
1259
1260         kref_init(&bo->kref);
1261         kref_init(&bo->list_kref);
1262         atomic_set(&bo->cpu_writers, 0);
1263         atomic_set(&bo->reserved, 1);
1264         init_waitqueue_head(&bo->event_queue);
1265         INIT_LIST_HEAD(&bo->lru);
1266         INIT_LIST_HEAD(&bo->ddestroy);
1267         INIT_LIST_HEAD(&bo->swap);
1268         INIT_LIST_HEAD(&bo->io_reserve_lru);
1269         bo->bdev = bdev;
1270         bo->glob = bdev->glob;
1271         bo->type = type;
1272         bo->num_pages = num_pages;
1273         bo->mem.size = num_pages << PAGE_SHIFT;
1274         bo->mem.mem_type = TTM_PL_SYSTEM;
1275         bo->mem.num_pages = bo->num_pages;
1276         bo->mem.mm_node = NULL;
1277         bo->mem.page_alignment = page_alignment;
1278         bo->mem.bus.io_reserved_vm = false;
1279         bo->mem.bus.io_reserved_count = 0;
1280         bo->priv_flags = 0;
1281         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1282         bo->seq_valid = false;
1283         bo->persistent_swap_storage = persistent_swap_storage;
1284         bo->acc_size = acc_size;
1285         bo->sg = sg;
1286         atomic_inc(&bo->glob->bo_count);
1287
1288         ret = ttm_bo_check_placement(bo, placement);
1289         if (unlikely(ret != 0))
1290                 goto out_err;
1291
1292         /*
1293          * For ttm_bo_type_device buffers, allocate
1294          * address space from the device.
1295          */
1296         if (bo->type == ttm_bo_type_device ||
1297             bo->type == ttm_bo_type_sg) {
1298                 ret = ttm_bo_setup_vm(bo);
1299                 if (ret)
1300                         goto out_err;
1301         }
1302
1303         ret = ttm_bo_validate(bo, placement, interruptible, false);
1304         if (ret)
1305                 goto out_err;
1306
1307         ttm_bo_unreserve(bo);
1308         return 0;
1309
1310 out_err:
1311         ttm_bo_unreserve(bo);
1312         ttm_bo_unref(&bo);
1313
1314         return ret;
1315 }
1316 EXPORT_SYMBOL(ttm_bo_init);
1317
1318 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1319                        unsigned long bo_size,
1320                        unsigned struct_size)
1321 {
1322         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1323         size_t size = 0;
1324
1325         size += ttm_round_pot(struct_size);
1326         size += PAGE_ALIGN(npages * sizeof(void *));
1327         size += ttm_round_pot(sizeof(struct ttm_tt));
1328         return size;
1329 }
1330 EXPORT_SYMBOL(ttm_bo_acc_size);
1331
1332 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1333                            unsigned long bo_size,
1334                            unsigned struct_size)
1335 {
1336         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1337         size_t size = 0;
1338
1339         size += ttm_round_pot(struct_size);
1340         size += PAGE_ALIGN(npages * sizeof(void *));
1341         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1342         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1343         return size;
1344 }
1345 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1346
1347 int ttm_bo_create(struct ttm_bo_device *bdev,
1348                         unsigned long size,
1349                         enum ttm_bo_type type,
1350                         struct ttm_placement *placement,
1351                         uint32_t page_alignment,
1352                         bool interruptible,
1353                         struct vm_object *persistent_swap_storage,
1354                         struct ttm_buffer_object **p_bo)
1355 {
1356         struct ttm_buffer_object *bo;
1357         size_t acc_size;
1358         int ret;
1359
1360         bo = kmalloc(sizeof(*bo), M_TTM_BO, M_WAITOK | M_ZERO);
1361         if (unlikely(bo == NULL))
1362                 return -ENOMEM;
1363
1364         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1365         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1366                           interruptible, persistent_swap_storage, acc_size,
1367                           NULL, NULL);
1368         if (likely(ret == 0))
1369                 *p_bo = bo;
1370
1371         return ret;
1372 }
1373 EXPORT_SYMBOL(ttm_bo_create);
1374
1375 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1376                                         unsigned mem_type, bool allow_errors)
1377 {
1378         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1379         struct ttm_bo_global *glob = bdev->glob;
1380         int ret;
1381
1382         /*
1383          * Can't use standard list traversal since we're unlocking.
1384          */
1385
1386         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1387         while (!list_empty(&man->lru)) {
1388                 lockmgr(&glob->lru_lock, LK_RELEASE);
1389                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1390                 if (ret) {
1391                         if (allow_errors) {
1392                                 return ret;
1393                         } else {
1394                                 kprintf("[TTM] Cleanup eviction failed\n");
1395                         }
1396                 }
1397                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1398         }
1399         lockmgr(&glob->lru_lock, LK_RELEASE);
1400         return 0;
1401 }
1402
1403 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1404 {
1405         struct ttm_mem_type_manager *man;
1406         int ret = -EINVAL;
1407
1408         if (mem_type >= TTM_NUM_MEM_TYPES) {
1409                 kprintf("[TTM] Illegal memory type %d\n", mem_type);
1410                 return ret;
1411         }
1412         man = &bdev->man[mem_type];
1413
1414         if (!man->has_type) {
1415                 kprintf("[TTM] Trying to take down uninitialized memory manager type %u\n",
1416                        mem_type);
1417                 return ret;
1418         }
1419
1420         man->use_type = false;
1421         man->has_type = false;
1422
1423         ret = 0;
1424         if (mem_type > 0) {
1425                 ttm_bo_force_list_clean(bdev, mem_type, false);
1426
1427                 ret = (*man->func->takedown)(man);
1428         }
1429
1430         return ret;
1431 }
1432 EXPORT_SYMBOL(ttm_bo_clean_mm);
1433
1434 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1435 {
1436         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1437
1438         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1439                 kprintf("[TTM] Illegal memory manager memory type %u\n", mem_type);
1440                 return -EINVAL;
1441         }
1442
1443         if (!man->has_type) {
1444                 kprintf("[TTM] Memory type %u has not been initialized\n", mem_type);
1445                 return 0;
1446         }
1447
1448         return ttm_bo_force_list_clean(bdev, mem_type, true);
1449 }
1450 EXPORT_SYMBOL(ttm_bo_evict_mm);
1451
1452 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1453                         unsigned long p_size)
1454 {
1455         int ret = -EINVAL;
1456         struct ttm_mem_type_manager *man;
1457
1458         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1459         man = &bdev->man[type];
1460         BUG_ON(man->has_type);
1461         man->io_reserve_fastpath = true;
1462         man->use_io_reserve_lru = false;
1463         lockinit(&man->io_reserve_mutex, "ttmman", 0, LK_CANRECURSE);
1464         INIT_LIST_HEAD(&man->io_reserve_lru);
1465
1466         ret = bdev->driver->init_mem_type(bdev, type, man);
1467         if (ret)
1468                 return ret;
1469         man->bdev = bdev;
1470
1471         ret = 0;
1472         if (type != TTM_PL_SYSTEM) {
1473                 ret = (*man->func->init)(man, p_size);
1474                 if (ret)
1475                         return ret;
1476         }
1477         man->has_type = true;
1478         man->use_type = true;
1479         man->size = p_size;
1480
1481         INIT_LIST_HEAD(&man->lru);
1482
1483         return 0;
1484 }
1485 EXPORT_SYMBOL(ttm_bo_init_mm);
1486
1487 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob)
1488 {
1489
1490         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1491         vm_page_free(glob->dummy_read_page);
1492 }
1493
1494 void ttm_bo_global_release(struct drm_global_reference *ref)
1495 {
1496         struct ttm_bo_global *glob = ref->object;
1497
1498         if (refcount_release(&glob->kobj_ref))
1499                 ttm_bo_global_kobj_release(glob);
1500 }
1501 EXPORT_SYMBOL(ttm_bo_global_release);
1502
1503 int ttm_bo_global_init(struct drm_global_reference *ref)
1504 {
1505         struct ttm_bo_global_ref *bo_ref =
1506                 container_of(ref, struct ttm_bo_global_ref, ref);
1507         struct ttm_bo_global *glob = ref->object;
1508         int ret;
1509
1510         lockinit(&glob->device_list_mutex, "ttmdlm", 0, LK_CANRECURSE);
1511         lockinit(&glob->lru_lock, "ttmlru", 0, LK_CANRECURSE);
1512         glob->mem_glob = bo_ref->mem_glob;
1513         glob->dummy_read_page = vm_page_alloc_contig(
1514             0, VM_MAX_ADDRESS, PAGE_SIZE, 0, 1*PAGE_SIZE, VM_MEMATTR_UNCACHEABLE);
1515
1516         if (unlikely(glob->dummy_read_page == NULL)) {
1517                 ret = -ENOMEM;
1518                 goto out_no_drp;
1519         }
1520
1521         INIT_LIST_HEAD(&glob->swap_lru);
1522         INIT_LIST_HEAD(&glob->device_list);
1523
1524         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1525         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1526         if (unlikely(ret != 0)) {
1527                 kprintf("[TTM] Could not register buffer object swapout\n");
1528                 goto out_no_shrink;
1529         }
1530
1531         atomic_set(&glob->bo_count, 0);
1532
1533         refcount_init(&glob->kobj_ref, 1);
1534         return (0);
1535
1536 out_no_shrink:
1537         vm_page_free(glob->dummy_read_page);
1538 out_no_drp:
1539         kfree(glob, M_DRM_GLOBAL);
1540         return ret;
1541 }
1542 EXPORT_SYMBOL(ttm_bo_global_init);
1543
1544
1545 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1546 {
1547         int ret = 0;
1548         unsigned i = TTM_NUM_MEM_TYPES;
1549         struct ttm_mem_type_manager *man;
1550         struct ttm_bo_global *glob = bdev->glob;
1551
1552         while (i--) {
1553                 man = &bdev->man[i];
1554                 if (man->has_type) {
1555                         man->use_type = false;
1556                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1557                                 ret = -EBUSY;
1558                                 kprintf("[TTM] DRM memory manager type %d is not clean\n",
1559                                        i);
1560                         }
1561                         man->has_type = false;
1562                 }
1563         }
1564
1565         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1566         list_del(&bdev->device_list);
1567         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1568
1569         if (taskqueue_cancel_timeout(taskqueue_thread[mycpuid], &bdev->wq, NULL))
1570                 taskqueue_drain_timeout(taskqueue_thread[mycpuid], &bdev->wq);
1571
1572         while (ttm_bo_delayed_delete(bdev, true))
1573                 ;
1574
1575         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1576         if (list_empty(&bdev->ddestroy))
1577                 TTM_DEBUG("Delayed destroy list was clean\n");
1578
1579         if (list_empty(&bdev->man[0].lru))
1580                 TTM_DEBUG("Swap list was clean\n");
1581         lockmgr(&glob->lru_lock, LK_RELEASE);
1582
1583         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1584         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1585         drm_mm_takedown(&bdev->addr_space_mm);
1586         lockmgr(&bdev->vm_lock, LK_RELEASE);
1587
1588         return ret;
1589 }
1590 EXPORT_SYMBOL(ttm_bo_device_release);
1591
1592 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1593                        struct ttm_bo_global *glob,
1594                        struct ttm_bo_driver *driver,
1595                        uint64_t file_page_offset,
1596                        bool need_dma32)
1597 {
1598         int ret = -EINVAL;
1599
1600         lockinit(&bdev->vm_lock, "ttmvml", 0, LK_CANRECURSE);
1601         bdev->driver = driver;
1602
1603         memset(bdev->man, 0, sizeof(bdev->man));
1604
1605         /*
1606          * Initialize the system memory buffer type.
1607          * Other types need to be driver / IOCTL initialized.
1608          */
1609         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1610         if (unlikely(ret != 0))
1611                 goto out_no_sys;
1612
1613         bdev->addr_space_rb = RB_ROOT;
1614         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1615         if (unlikely(ret != 0))
1616                 goto out_no_addr_mm;
1617
1618         TIMEOUT_TASK_INIT(taskqueue_thread[mycpuid], &bdev->wq, 0,
1619             ttm_bo_delayed_workqueue, bdev);
1620         INIT_LIST_HEAD(&bdev->ddestroy);
1621         bdev->dev_mapping = NULL;
1622         bdev->glob = glob;
1623         bdev->need_dma32 = need_dma32;
1624         bdev->val_seq = 0;
1625         lockinit(&bdev->fence_lock, "ttmfence", 0, LK_CANRECURSE);
1626         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1627         list_add_tail(&bdev->device_list, &glob->device_list);
1628         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1629
1630         return 0;
1631 out_no_addr_mm:
1632         ttm_bo_clean_mm(bdev, 0);
1633 out_no_sys:
1634         return ret;
1635 }
1636 EXPORT_SYMBOL(ttm_bo_device_init);
1637
1638 /*
1639  * buffer object vm functions.
1640  */
1641
1642 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1643 {
1644         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1645
1646         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1647                 if (mem->mem_type == TTM_PL_SYSTEM)
1648                         return false;
1649
1650                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1651                         return false;
1652
1653                 if (mem->placement & TTM_PL_FLAG_CACHED)
1654                         return false;
1655         }
1656         return true;
1657 }
1658
1659 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1660 {
1661
1662         ttm_bo_release_mmap(bo);
1663         ttm_mem_io_free_vm(bo);
1664 }
1665
1666 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1667 {
1668         struct ttm_bo_device *bdev = bo->bdev;
1669         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1670
1671         ttm_mem_io_lock(man, false);
1672         ttm_bo_unmap_virtual_locked(bo);
1673         ttm_mem_io_unlock(man);
1674 }
1675
1676
1677 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1678
1679 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1680 {
1681         struct ttm_bo_device *bdev = bo->bdev;
1682         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1683         struct rb_node *parent = NULL;
1684         struct ttm_buffer_object *cur_bo;
1685         unsigned long offset = bo->vm_node->start;
1686         unsigned long cur_offset;
1687
1688         while (*cur) {
1689                 parent = *cur;
1690                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1691                 cur_offset = cur_bo->vm_node->start;
1692                 if (offset < cur_offset)
1693                         cur = &parent->rb_left;
1694                 else if (offset > cur_offset)
1695                         cur = &parent->rb_right;
1696                 else
1697                         BUG();
1698         }
1699
1700         rb_link_node(&bo->vm_rb, parent, cur);
1701         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1702 }
1703
1704 /**
1705  * ttm_bo_setup_vm:
1706  *
1707  * @bo: the buffer to allocate address space for
1708  *
1709  * Allocate address space in the drm device so that applications
1710  * can mmap the buffer and access the contents. This only
1711  * applies to ttm_bo_type_device objects as others are not
1712  * placed in the drm device address space.
1713  */
1714
1715 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1716 {
1717         struct ttm_bo_device *bdev = bo->bdev;
1718         int ret;
1719
1720 retry_pre_get:
1721         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1722         if (unlikely(ret != 0))
1723                 return ret;
1724
1725         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1726         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1727                                          bo->mem.num_pages, 0, 0);
1728
1729         if (unlikely(bo->vm_node == NULL)) {
1730                 ret = -ENOMEM;
1731                 goto out_unlock;
1732         }
1733
1734         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1735                                               bo->mem.num_pages, 0);
1736
1737         if (unlikely(bo->vm_node == NULL)) {
1738                 lockmgr(&bdev->vm_lock, LK_RELEASE);
1739                 goto retry_pre_get;
1740         }
1741
1742         ttm_bo_vm_insert_rb(bo);
1743         lockmgr(&bdev->vm_lock, LK_RELEASE);
1744         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1745
1746         return 0;
1747 out_unlock:
1748         lockmgr(&bdev->vm_lock, LK_RELEASE);
1749         return ret;
1750 }
1751
1752 int ttm_bo_wait(struct ttm_buffer_object *bo,
1753                 bool lazy, bool interruptible, bool no_wait)
1754 {
1755         struct ttm_bo_driver *driver = bo->bdev->driver;
1756         struct ttm_bo_device *bdev = bo->bdev;
1757         void *sync_obj;
1758         int ret = 0;
1759
1760         if (likely(bo->sync_obj == NULL))
1761                 return 0;
1762
1763         while (bo->sync_obj) {
1764
1765                 if (driver->sync_obj_signaled(bo->sync_obj)) {
1766                         void *tmp_obj = bo->sync_obj;
1767                         bo->sync_obj = NULL;
1768                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1769                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1770                         driver->sync_obj_unref(&tmp_obj);
1771                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1772                         continue;
1773                 }
1774
1775                 if (no_wait)
1776                         return -EBUSY;
1777
1778                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1779                 lockmgr(&bdev->fence_lock, LK_RELEASE);
1780                 ret = driver->sync_obj_wait(sync_obj,
1781                                             lazy, interruptible);
1782                 if (unlikely(ret != 0)) {
1783                         driver->sync_obj_unref(&sync_obj);
1784                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1785                         return ret;
1786                 }
1787                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1788                 if (likely(bo->sync_obj == sync_obj)) {
1789                         void *tmp_obj = bo->sync_obj;
1790                         bo->sync_obj = NULL;
1791                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1792                                   &bo->priv_flags);
1793                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1794                         driver->sync_obj_unref(&sync_obj);
1795                         driver->sync_obj_unref(&tmp_obj);
1796                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1797                 } else {
1798                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1799                         driver->sync_obj_unref(&sync_obj);
1800                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1801                 }
1802         }
1803         return 0;
1804 }
1805 EXPORT_SYMBOL(ttm_bo_wait);
1806
1807 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1808 {
1809         struct ttm_bo_device *bdev = bo->bdev;
1810         int ret = 0;
1811
1812         /*
1813          * Using ttm_bo_reserve makes sure the lru lists are updated.
1814          */
1815
1816         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1817         if (unlikely(ret != 0))
1818                 return ret;
1819         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1820         ret = ttm_bo_wait(bo, false, true, no_wait);
1821         lockmgr(&bdev->fence_lock, LK_RELEASE);
1822         if (likely(ret == 0))
1823                 atomic_inc(&bo->cpu_writers);
1824         ttm_bo_unreserve(bo);
1825         return ret;
1826 }
1827 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1828
1829 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1830 {
1831         atomic_dec(&bo->cpu_writers);
1832 }
1833 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1834
1835 /**
1836  * A buffer object shrink method that tries to swap out the first
1837  * buffer object on the bo_global::swap_lru list.
1838  */
1839
1840 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1841 {
1842         struct ttm_bo_global *glob =
1843             container_of(shrink, struct ttm_bo_global, shrink);
1844         struct ttm_buffer_object *bo;
1845         int ret = -EBUSY;
1846         int put_count;
1847         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1848
1849         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1850         list_for_each_entry(bo, &glob->swap_lru, swap) {
1851                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1852                 if (!ret)
1853                         break;
1854         }
1855
1856         if (ret) {
1857                 lockmgr(&glob->lru_lock, LK_RELEASE);
1858                 return ret;
1859         }
1860
1861         kref_get(&bo->list_kref);
1862
1863         if (!list_empty(&bo->ddestroy)) {
1864                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1865                 kref_put(&bo->list_kref, ttm_bo_release_list);
1866                 return ret;
1867         }
1868
1869         put_count = ttm_bo_del_from_lru(bo);
1870         lockmgr(&glob->lru_lock, LK_RELEASE);
1871
1872         ttm_bo_list_ref_sub(bo, put_count, true);
1873
1874         /**
1875          * Wait for GPU, then move to system cached.
1876          */
1877
1878         lockmgr(&bo->bdev->fence_lock, LK_EXCLUSIVE);
1879         ret = ttm_bo_wait(bo, false, false, false);
1880         lockmgr(&bo->bdev->fence_lock, LK_RELEASE);
1881
1882         if (unlikely(ret != 0))
1883                 goto out;
1884
1885         if ((bo->mem.placement & swap_placement) != swap_placement) {
1886                 struct ttm_mem_reg evict_mem;
1887
1888                 evict_mem = bo->mem;
1889                 evict_mem.mm_node = NULL;
1890                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1891                 evict_mem.mem_type = TTM_PL_SYSTEM;
1892
1893                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1894                                              false, false);
1895                 if (unlikely(ret != 0))
1896                         goto out;
1897         }
1898
1899         ttm_bo_unmap_virtual(bo);
1900
1901         /**
1902          * Swap out. Buffer will be swapped in again as soon as
1903          * anyone tries to access a ttm page.
1904          */
1905
1906         if (bo->bdev->driver->swap_notify)
1907                 bo->bdev->driver->swap_notify(bo);
1908
1909         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1910 out:
1911
1912         /**
1913          *
1914          * Unreserve without putting on LRU to avoid swapping out an
1915          * already swapped buffer.
1916          */
1917
1918         atomic_set(&bo->reserved, 0);
1919         wake_up_all(&bo->event_queue);
1920         kref_put(&bo->list_kref, ttm_bo_release_list);
1921         return ret;
1922 }
1923
1924 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1925 {
1926         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1927                 ;
1928 }
1929 EXPORT_SYMBOL(ttm_bo_swapout_all);