drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #define pr_fmt(fmt) "[TTM] " fmt
  32
  33 #include <drm/ttm/ttm_module.h>
  34 #include <drm/ttm/ttm_bo_driver.h>
  35 #include <drm/ttm/ttm_placement.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/slab.h>
  38 #include <linux/sched.h>
  39 #include <linux/mm.h>
  40 #include <linux/file.h>
  41 #include <linux/module.h>
  42 #include <linux/atomic.h>
  43
  44 #define TTM_ASSERT_LOCKED(param)
  45 #define TTM_DEBUG(fmt, arg...)
  46 #define TTM_BO_HASH_ORDER 13
  47
  48 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  49 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  50 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  51
  52 static struct attribute ttm_bo_count = {
  53         .name = "bo_count",
  54         .mode = S_IRUGO
  55 };
  56
  57 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  58 {
  59         int i;
  60
  61         for (i = 0; i <= TTM_PL_PRIV5; i++)
  62                 if (flags & (1 << i)) {
  63                         *mem_type = i;
  64                         return 0;
  65                 }
  66         return -EINVAL;
  67 }
  68
  69 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  70 {
  71         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  72
  73         pr_err("    has_type: %d\n", man->has_type);
  74         pr_err("    use_type: %d\n", man->use_type);
  75         pr_err("    flags: 0x%08X\n", man->flags);
  76         pr_err("    gpu_offset: 0x%08lX\n", man->gpu_offset);
  77         pr_err("    size: %llu\n", man->size);
  78         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  79         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  80         if (mem_type != TTM_PL_SYSTEM)
  81                 (*man->func->debug)(man, TTM_PFX);
  82 }
  83
  84 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  85                                         struct ttm_placement *placement)
  86 {
  87         int i, ret, mem_type;
  88
  89         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  90                bo, bo->mem.num_pages, bo->mem.size >> 10,
  91                bo->mem.size >> 20);
  92         for (i = 0; i < placement->num_placement; i++) {
  93                 ret = ttm_mem_type_from_flags(placement->placement[i],
  94                                                 &mem_type);
  95                 if (ret)
  96                         return;
  97                 pr_err("  placement[%d]=0x%08X (%d)\n",
  98                        i, placement->placement[i], mem_type);
  99                 ttm_mem_type_debug(bo->bdev, mem_type);
 100         }
 101 }
 102
 103 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 104                                   struct attribute *attr,
 105                                   char *buffer)
 106 {
 107         struct ttm_bo_global *glob =
 108                 container_of(kobj, struct ttm_bo_global, kobj);
 109
 110         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 111                         (unsigned long) atomic_read(&glob->bo_count));
 112 }
 113
 114 static struct attribute *ttm_bo_global_attrs[] = {
 115         &ttm_bo_count,
 116         NULL
 117 };
 118
 119 static const struct sysfs_ops ttm_bo_global_ops = {
 120         .show = &ttm_bo_global_show
 121 };
 122
 123 static struct kobj_type ttm_bo_glob_kobj_type  = {
 124         .release = &ttm_bo_global_kobj_release,
 125         .sysfs_ops = &ttm_bo_global_ops,
 126         .default_attrs = ttm_bo_global_attrs
 127 };
 128
 129
 130 static inline uint32_t ttm_bo_type_flags(unsigned type)
 131 {
 132         return 1 << (type);
 133 }
 134
 135 static void ttm_bo_release_list(struct kref *list_kref)
 136 {
 137         struct ttm_buffer_object *bo =
 138             container_of(list_kref, struct ttm_buffer_object, list_kref);
 139         struct ttm_bo_device *bdev = bo->bdev;
 140         size_t acc_size = bo->acc_size;
 141
 142         BUG_ON(atomic_read(&bo->list_kref.refcount));
 143         BUG_ON(atomic_read(&bo->kref.refcount));
 144         BUG_ON(atomic_read(&bo->cpu_writers));
 145         BUG_ON(bo->sync_obj != NULL);
 146         BUG_ON(bo->mem.mm_node != NULL);
 147         BUG_ON(!list_empty(&bo->lru));
 148         BUG_ON(!list_empty(&bo->ddestroy));
 149
 150         if (bo->ttm)
 151                 ttm_tt_destroy(bo->ttm);
 152         atomic_dec(&bo->glob->bo_count);
 153         if (bo->destroy)
 154                 bo->destroy(bo);
 155         else {
 156                 kfree(bo);
 157         }
 158         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 159 }
 160
 161 static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
 162                                   bool interruptible)
 163 {
 164         if (interruptible) {
 165                 return wait_event_interruptible(bo->event_queue,
 166                                                !ttm_bo_is_reserved(bo));
 167         } else {
 168                 wait_event(bo->event_queue, !ttm_bo_is_reserved(bo));
 169                 return 0;
 170         }
 171 }
 172
 173 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 174 {
 175         struct ttm_bo_device *bdev = bo->bdev;
 176         struct ttm_mem_type_manager *man;
 177
 178         BUG_ON(!ttm_bo_is_reserved(bo));
 179
 180         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 181
 182                 BUG_ON(!list_empty(&bo->lru));
 183
 184                 man = &bdev->man[bo->mem.mem_type];
 185                 list_add_tail(&bo->lru, &man->lru);
 186                 kref_get(&bo->list_kref);
 187
 188                 if (bo->ttm != NULL) {
 189                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 190                         kref_get(&bo->list_kref);
 191                 }
 192         }
 193 }
 194
 195 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 196 {
 197         int put_count = 0;
 198
 199         if (!list_empty(&bo->swap)) {
 200                 list_del_init(&bo->swap);
 201                 ++put_count;
 202         }
 203         if (!list_empty(&bo->lru)) {
 204                 list_del_init(&bo->lru);
 205                 ++put_count;
 206         }
 207
 208         /*
 209          * TODO: Add a driver hook to delete from
 210          * driver-specific LRU's here.
 211          */
 212
 213         return put_count;
 214 }
 215
 216 int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
 217                           bool interruptible,
 218                           bool no_wait, bool use_sequence, uint32_t sequence)
 219 {
 220         int ret;
 221
 222         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 223                 /**
 224                  * Deadlock avoidance for multi-bo reserving.
 225                  */
 226                 if (use_sequence && bo->seq_valid) {
 227                         /**
 228                          * We've already reserved this one.
 229                          */
 230                         if (unlikely(sequence == bo->val_seq))
 231                                 return -EDEADLK;
 232                         /**
 233                          * Already reserved by a thread that will not back
 234                          * off for us. We need to back off.
 235                          */
 236                         if (unlikely(sequence - bo->val_seq < (1 << 31)))
 237                                 return -EAGAIN;
 238                 }
 239
 240                 if (no_wait)
 241                         return -EBUSY;
 242
 243                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 244
 245                 if (unlikely(ret))
 246                         return ret;
 247         }
 248
 249         if (use_sequence) {
 250                 bool wake_up = false;
 251                 /**
 252                  * Wake up waiters that may need to recheck for deadlock,
 253                  * if we decreased the sequence number.
 254                  */
 255                 if (unlikely((bo->val_seq - sequence < (1 << 31))
 256                              || !bo->seq_valid))
 257                         wake_up = true;
 258
 259                 /*
 260                  * In the worst case with memory ordering these values can be
 261                  * seen in the wrong order. However since we call wake_up_all
 262                  * in that case, this will hopefully not pose a problem,
 263                  * and the worst case would only cause someone to accidentally
 264                  * hit -EAGAIN in ttm_bo_reserve when they see old value of
 265                  * val_seq. However this would only happen if seq_valid was
 266                  * written before val_seq was, and just means some slightly
 267                  * increased cpu usage
 268                  */
 269                 bo->val_seq = sequence;
 270                 bo->seq_valid = true;
 271                 if (wake_up)
 272                         wake_up_all(&bo->event_queue);
 273         } else {
 274                 bo->seq_valid = false;
 275         }
 276
 277         return 0;
 278 }
 279 EXPORT_SYMBOL(ttm_bo_reserve);
 280
 281 static void ttm_bo_ref_bug(struct kref *list_kref)
 282 {
 283         BUG();
 284 }
 285
 286 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 287                          bool never_free)
 288 {
 289         kref_sub(&bo->list_kref, count,
 290                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 291 }
 292
 293 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 294                    bool interruptible,
 295                    bool no_wait, bool use_sequence, uint32_t sequence)
 296 {
 297         struct ttm_bo_global *glob = bo->glob;
 298         int put_count = 0;
 299         int ret;
 300
 301         ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_sequence,
 302                                    sequence);
 303         if (likely(ret == 0)) {
 304                 spin_lock(&glob->lru_lock);
 305                 put_count = ttm_bo_del_from_lru(bo);
 306                 spin_unlock(&glob->lru_lock);
 307                 ttm_bo_list_ref_sub(bo, put_count, true);
 308         }
 309
 310         return ret;
 311 }
 312
 313 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
 314                                   bool interruptible, uint32_t sequence)
 315 {
 316         bool wake_up = false;
 317         int ret;
 318
 319         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 320                 WARN_ON(bo->seq_valid && sequence == bo->val_seq);
 321
 322                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 323
 324                 if (unlikely(ret))
 325                         return ret;
 326         }
 327
 328         if ((bo->val_seq - sequence < (1 << 31)) || !bo->seq_valid)
 329                 wake_up = true;
 330
 331         /**
 332          * Wake up waiters that may need to recheck for deadlock,
 333          * if we decreased the sequence number.
 334          */
 335         bo->val_seq = sequence;
 336         bo->seq_valid = true;
 337         if (wake_up)
 338                 wake_up_all(&bo->event_queue);
 339
 340         return 0;
 341 }
 342
 343 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 344                             bool interruptible, uint32_t sequence)
 345 {
 346         struct ttm_bo_global *glob = bo->glob;
 347         int put_count, ret;
 348
 349         ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, sequence);
 350         if (likely(!ret)) {
 351                 spin_lock(&glob->lru_lock);
 352                 put_count = ttm_bo_del_from_lru(bo);
 353                 spin_unlock(&glob->lru_lock);
 354                 ttm_bo_list_ref_sub(bo, put_count, true);
 355         }
 356         return ret;
 357 }
 358 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
 359
 360 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
 361 {
 362         ttm_bo_add_to_lru(bo);
 363         atomic_set(&bo->reserved, 0);
 364         wake_up_all(&bo->event_queue);
 365 }
 366
 367 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 368 {
 369         struct ttm_bo_global *glob = bo->glob;
 370
 371         spin_lock(&glob->lru_lock);
 372         ttm_bo_unreserve_locked(bo);
 373         spin_unlock(&glob->lru_lock);
 374 }
 375 EXPORT_SYMBOL(ttm_bo_unreserve);
 376
 377 /*
 378  * Call bo->mutex locked.
 379  */
 380 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 381 {
 382         struct ttm_bo_device *bdev = bo->bdev;
 383         struct ttm_bo_global *glob = bo->glob;
 384         int ret = 0;
 385         uint32_t page_flags = 0;
 386
 387         TTM_ASSERT_LOCKED(&bo->mutex);
 388         bo->ttm = NULL;
 389
 390         if (bdev->need_dma32)
 391                 page_flags |= TTM_PAGE_FLAG_DMA32;
 392
 393         switch (bo->type) {
 394         case ttm_bo_type_device:
 395                 if (zero_alloc)
 396                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 397         case ttm_bo_type_kernel:
 398                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 399                                                       page_flags, glob->dummy_read_page);
 400                 if (unlikely(bo->ttm == NULL))
 401                         ret = -ENOMEM;
 402                 break;
 403         case ttm_bo_type_sg:
 404                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 405                                                       page_flags | TTM_PAGE_FLAG_SG,
 406                                                       glob->dummy_read_page);
 407                 if (unlikely(bo->ttm == NULL)) {
 408                         ret = -ENOMEM;
 409                         break;
 410                 }
 411                 bo->ttm->sg = bo->sg;
 412                 break;
 413         default:
 414                 pr_err("Illegal buffer object type\n");
 415                 ret = -EINVAL;
 416                 break;
 417         }
 418
 419         return ret;
 420 }
 421
 422 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 423                                   struct ttm_mem_reg *mem,
 424                                   bool evict, bool interruptible,
 425                                   bool no_wait_gpu)
 426 {
 427         struct ttm_bo_device *bdev = bo->bdev;
 428         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 429         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 430         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 431         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 432         int ret = 0;
 433
 434         if (old_is_pci || new_is_pci ||
 435             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 436                 ret = ttm_mem_io_lock(old_man, true);
 437                 if (unlikely(ret != 0))
 438                         goto out_err;
 439                 ttm_bo_unmap_virtual_locked(bo);
 440                 ttm_mem_io_unlock(old_man);
 441         }
 442
 443         /*
 444          * Create and bind a ttm if required.
 445          */
 446
 447         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 448                 if (bo->ttm == NULL) {
 449                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 450                         ret = ttm_bo_add_ttm(bo, zero);
 451                         if (ret)
 452                                 goto out_err;
 453                 }
 454
 455                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 456                 if (ret)
 457                         goto out_err;
 458
 459                 if (mem->mem_type != TTM_PL_SYSTEM) {
 460                         ret = ttm_tt_bind(bo->ttm, mem);
 461                         if (ret)
 462                                 goto out_err;
 463                 }
 464
 465                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 466                         if (bdev->driver->move_notify)
 467                                 bdev->driver->move_notify(bo, mem);
 468                         bo->mem = *mem;
 469                         mem->mm_node = NULL;
 470                         goto moved;
 471                 }
 472         }
 473
 474         if (bdev->driver->move_notify)
 475                 bdev->driver->move_notify(bo, mem);
 476
 477         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 478             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 479                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 480         else if (bdev->driver->move)
 481                 ret = bdev->driver->move(bo, evict, interruptible,
 482                                          no_wait_gpu, mem);
 483         else
 484                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 485
 486         if (ret) {
 487                 if (bdev->driver->move_notify) {
 488                         struct ttm_mem_reg tmp_mem = *mem;
 489                         *mem = bo->mem;
 490                         bo->mem = tmp_mem;
 491                         bdev->driver->move_notify(bo, mem);
 492                         bo->mem = *mem;
 493                         *mem = tmp_mem;
 494                 }
 495
 496                 goto out_err;
 497         }
 498
 499 moved:
 500         if (bo->evicted) {
 501                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 502                 if (ret)
 503                         pr_err("Can not flush read caches\n");
 504                 bo->evicted = false;
 505         }
 506
 507         if (bo->mem.mm_node) {
 508                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 509                     bdev->man[bo->mem.mem_type].gpu_offset;
 510                 bo->cur_placement = bo->mem.placement;
 511         } else
 512                 bo->offset = 0;
 513
 514         return 0;
 515
 516 out_err:
 517         new_man = &bdev->man[bo->mem.mem_type];
 518         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 519                 ttm_tt_unbind(bo->ttm);
 520                 ttm_tt_destroy(bo->ttm);
 521                 bo->ttm = NULL;
 522         }
 523
 524         return ret;
 525 }
 526
 527 /**
 528  * Call bo::reserved.
 529  * Will release GPU memory type usage on destruction.
 530  * This is the place to put in driver specific hooks to release
 531  * driver private resources.
 532  * Will release the bo::reserved lock.
 533  */
 534
 535 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 536 {
 537         if (bo->bdev->driver->move_notify)
 538                 bo->bdev->driver->move_notify(bo, NULL);
 539
 540         if (bo->ttm) {
 541                 ttm_tt_unbind(bo->ttm);
 542                 ttm_tt_destroy(bo->ttm);
 543                 bo->ttm = NULL;
 544         }
 545         ttm_bo_mem_put(bo, &bo->mem);
 546
 547         atomic_set(&bo->reserved, 0);
 548         wake_up_all(&bo->event_queue);
 549
 550         /*
 551          * Since the final reference to this bo may not be dropped by
 552          * the current task we have to put a memory barrier here to make
 553          * sure the changes done in this function are always visible.
 554          *
 555          * This function only needs protection against the final kref_put.
 556          */
 557         smp_mb__before_atomic_dec();
 558 }
 559
 560 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 561 {
 562         struct ttm_bo_device *bdev = bo->bdev;
 563         struct ttm_bo_global *glob = bo->glob;
 564         struct ttm_bo_driver *driver = bdev->driver;
 565         void *sync_obj = NULL;
 566         int put_count;
 567         int ret;
 568
 569         spin_lock(&glob->lru_lock);
 570         ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 571
 572         spin_lock(&bdev->fence_lock);
 573         (void) ttm_bo_wait(bo, false, false, true);
 574         if (!ret && !bo->sync_obj) {
 575                 spin_unlock(&bdev->fence_lock);
 576                 put_count = ttm_bo_del_from_lru(bo);
 577
 578                 spin_unlock(&glob->lru_lock);
 579                 ttm_bo_cleanup_memtype_use(bo);
 580
 581                 ttm_bo_list_ref_sub(bo, put_count, true);
 582
 583                 return;
 584         }
 585         if (bo->sync_obj)
 586                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 587         spin_unlock(&bdev->fence_lock);
 588
 589         if (!ret) {
 590                 atomic_set(&bo->reserved, 0);
 591                 wake_up_all(&bo->event_queue);
 592         }
 593
 594         kref_get(&bo->list_kref);
 595         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 596         spin_unlock(&glob->lru_lock);
 597
 598         if (sync_obj) {
 599                 driver->sync_obj_flush(sync_obj);
 600                 driver->sync_obj_unref(&sync_obj);
 601         }
 602         schedule_delayed_work(&bdev->wq,
 603                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 604 }
 605
 606 /**
 607  * function ttm_bo_cleanup_refs_and_unlock
 608  * If bo idle, remove from delayed- and lru lists, and unref.
 609  * If not idle, do nothing.
 610  *
 611  * Must be called with lru_lock and reservation held, this function
 612  * will drop both before returning.
 613  *
 614  * @interruptible         Any sleeps should occur interruptibly.
 615  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 616  */
 617
 618 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 619                                           bool interruptible,
 620                                           bool no_wait_gpu)
 621 {
 622         struct ttm_bo_device *bdev = bo->bdev;
 623         struct ttm_bo_driver *driver = bdev->driver;
 624         struct ttm_bo_global *glob = bo->glob;
 625         int put_count;
 626         int ret;
 627
 628         spin_lock(&bdev->fence_lock);
 629         ret = ttm_bo_wait(bo, false, false, true);
 630
 631         if (ret && !no_wait_gpu) {
 632                 void *sync_obj;
 633
 634                 /*
 635                  * Take a reference to the fence and unreserve,
 636                  * at this point the buffer should be dead, so
 637                  * no new sync objects can be attached.
 638                  */
 639                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 640                 spin_unlock(&bdev->fence_lock);
 641
 642                 atomic_set(&bo->reserved, 0);
 643                 wake_up_all(&bo->event_queue);
 644                 spin_unlock(&glob->lru_lock);
 645
 646                 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
 647                 driver->sync_obj_unref(&sync_obj);
 648                 if (ret)
 649                         return ret;
 650
 651                 /*
 652                  * remove sync_obj with ttm_bo_wait, the wait should be
 653                  * finished, and no new wait object should have been added.
 654                  */
 655                 spin_lock(&bdev->fence_lock);
 656                 ret = ttm_bo_wait(bo, false, false, true);
 657                 WARN_ON(ret);
 658                 spin_unlock(&bdev->fence_lock);
 659                 if (ret)
 660                         return ret;
 661
 662                 spin_lock(&glob->lru_lock);
 663                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 664
 665                 /*
 666                  * We raced, and lost, someone else holds the reservation now,
 667                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 668                  *
 669                  * Even if it's not the case, because we finished waiting any
 670                  * delayed destruction would succeed, so just return success
 671                  * here.
 672                  */
 673                 if (ret) {
 674                         spin_unlock(&glob->lru_lock);
 675                         return 0;
 676                 }
 677         } else
 678                 spin_unlock(&bdev->fence_lock);
 679
 680         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 681                 atomic_set(&bo->reserved, 0);
 682                 wake_up_all(&bo->event_queue);
 683                 spin_unlock(&glob->lru_lock);
 684                 return ret;
 685         }
 686
 687         put_count = ttm_bo_del_from_lru(bo);
 688         list_del_init(&bo->ddestroy);
 689         ++put_count;
 690
 691         spin_unlock(&glob->lru_lock);
 692         ttm_bo_cleanup_memtype_use(bo);
 693
 694         ttm_bo_list_ref_sub(bo, put_count, true);
 695
 696         return 0;
 697 }
 698
 699 /**
 700  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 701  * encountered buffers.
 702  */
 703
 704 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 705 {
 706         struct ttm_bo_global *glob = bdev->glob;
 707         struct ttm_buffer_object *entry = NULL;
 708         int ret = 0;
 709
 710         spin_lock(&glob->lru_lock);
 711         if (list_empty(&bdev->ddestroy))
 712                 goto out_unlock;
 713
 714         entry = list_first_entry(&bdev->ddestroy,
 715                 struct ttm_buffer_object, ddestroy);
 716         kref_get(&entry->list_kref);
 717
 718         for (;;) {
 719                 struct ttm_buffer_object *nentry = NULL;
 720
 721                 if (entry->ddestroy.next != &bdev->ddestroy) {
 722                         nentry = list_first_entry(&entry->ddestroy,
 723                                 struct ttm_buffer_object, ddestroy);
 724                         kref_get(&nentry->list_kref);
 725                 }
 726
 727                 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
 728                 if (remove_all && ret) {
 729                         spin_unlock(&glob->lru_lock);
 730                         ret = ttm_bo_reserve_nolru(entry, false, false,
 731                                                    false, 0);
 732                         spin_lock(&glob->lru_lock);
 733                 }
 734
 735                 if (!ret)
 736                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 737                                                              !remove_all);
 738                 else
 739                         spin_unlock(&glob->lru_lock);
 740
 741                 kref_put(&entry->list_kref, ttm_bo_release_list);
 742                 entry = nentry;
 743
 744                 if (ret || !entry)
 745                         goto out;
 746
 747                 spin_lock(&glob->lru_lock);
 748                 if (list_empty(&entry->ddestroy))
 749                         break;
 750         }
 751
 752 out_unlock:
 753         spin_unlock(&glob->lru_lock);
 754 out:
 755         if (entry)
 756                 kref_put(&entry->list_kref, ttm_bo_release_list);
 757         return ret;
 758 }
 759
 760 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 761 {
 762         struct ttm_bo_device *bdev =
 763             container_of(work, struct ttm_bo_device, wq.work);
 764
 765         if (ttm_bo_delayed_delete(bdev, false)) {
 766                 schedule_delayed_work(&bdev->wq,
 767                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 768         }
 769 }
 770
 771 static void ttm_bo_release(struct kref *kref)
 772 {
 773         struct ttm_buffer_object *bo =
 774             container_of(kref, struct ttm_buffer_object, kref);
 775         struct ttm_bo_device *bdev = bo->bdev;
 776         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 777
 778         write_lock(&bdev->vm_lock);
 779         if (likely(bo->vm_node != NULL)) {
 780                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 781                 drm_mm_put_block(bo->vm_node);
 782                 bo->vm_node = NULL;
 783         }
 784         write_unlock(&bdev->vm_lock);
 785         ttm_mem_io_lock(man, false);
 786         ttm_mem_io_free_vm(bo);
 787         ttm_mem_io_unlock(man);
 788         ttm_bo_cleanup_refs_or_queue(bo);
 789         kref_put(&bo->list_kref, ttm_bo_release_list);
 790 }
 791
 792 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 793 {
 794         struct ttm_buffer_object *bo = *p_bo;
 795
 796         *p_bo = NULL;
 797         kref_put(&bo->kref, ttm_bo_release);
 798 }
 799 EXPORT_SYMBOL(ttm_bo_unref);
 800
 801 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 802 {
 803         return cancel_delayed_work_sync(&bdev->wq);
 804 }
 805 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 806
 807 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 808 {
 809         if (resched)
 810                 schedule_delayed_work(&bdev->wq,
 811                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 812 }
 813 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 814
 815 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 816                         bool no_wait_gpu)
 817 {
 818         struct ttm_bo_device *bdev = bo->bdev;
 819         struct ttm_mem_reg evict_mem;
 820         struct ttm_placement placement;
 821         int ret = 0;
 822
 823         spin_lock(&bdev->fence_lock);
 824         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 825         spin_unlock(&bdev->fence_lock);
 826
 827         if (unlikely(ret != 0)) {
 828                 if (ret != -ERESTARTSYS) {
 829                         pr_err("Failed to expire sync object before buffer eviction\n");
 830                 }
 831                 goto out;
 832         }
 833
 834         BUG_ON(!ttm_bo_is_reserved(bo));
 835
 836         evict_mem = bo->mem;
 837         evict_mem.mm_node = NULL;
 838         evict_mem.bus.io_reserved_vm = false;
 839         evict_mem.bus.io_reserved_count = 0;
 840
 841         placement.fpfn = 0;
 842         placement.lpfn = 0;
 843         placement.num_placement = 0;
 844         placement.num_busy_placement = 0;
 845         bdev->driver->evict_flags(bo, &placement);
 846         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 847                                 no_wait_gpu);
 848         if (ret) {
 849                 if (ret != -ERESTARTSYS) {
 850                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 851                                bo);
 852                         ttm_bo_mem_space_debug(bo, &placement);
 853                 }
 854                 goto out;
 855         }
 856
 857         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 858                                      no_wait_gpu);
 859         if (ret) {
 860                 if (ret != -ERESTARTSYS)
 861                         pr_err("Buffer eviction failed\n");
 862                 ttm_bo_mem_put(bo, &evict_mem);
 863                 goto out;
 864         }
 865         bo->evicted = true;
 866 out:
 867         return ret;
 868 }
 869
 870 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 871                                 uint32_t mem_type,
 872                                 bool interruptible,
 873                                 bool no_wait_gpu)
 874 {
 875         struct ttm_bo_global *glob = bdev->glob;
 876         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 877         struct ttm_buffer_object *bo;
 878         int ret = -EBUSY, put_count;
 879
 880         spin_lock(&glob->lru_lock);
 881         list_for_each_entry(bo, &man->lru, lru) {
 882                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 883                 if (!ret)
 884                         break;
 885         }
 886
 887         if (ret) {
 888                 spin_unlock(&glob->lru_lock);
 889                 return ret;
 890         }
 891
 892         kref_get(&bo->list_kref);
 893
 894         if (!list_empty(&bo->ddestroy)) {
 895                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 896                                                      no_wait_gpu);
 897                 kref_put(&bo->list_kref, ttm_bo_release_list);
 898                 return ret;
 899         }
 900
 901         put_count = ttm_bo_del_from_lru(bo);
 902         spin_unlock(&glob->lru_lock);
 903
 904         BUG_ON(ret != 0);
 905
 906         ttm_bo_list_ref_sub(bo, put_count, true);
 907
 908         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 909         ttm_bo_unreserve(bo);
 910
 911         kref_put(&bo->list_kref, ttm_bo_release_list);
 912         return ret;
 913 }
 914
 915 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 916 {
 917         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 918
 919         if (mem->mm_node)
 920                 (*man->func->put_node)(man, mem);
 921 }
 922 EXPORT_SYMBOL(ttm_bo_mem_put);
 923
 924 /**
 925  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 926  * space, or we've evicted everything and there isn't enough space.
 927  */
 928 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 929                                         uint32_t mem_type,
 930                                         struct ttm_placement *placement,
 931                                         struct ttm_mem_reg *mem,
 932                                         bool interruptible,
 933                                         bool no_wait_gpu)
 934 {
 935         struct ttm_bo_device *bdev = bo->bdev;
 936         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 937         int ret;
 938
 939         do {
 940                 ret = (*man->func->get_node)(man, bo, placement, mem);
 941                 if (unlikely(ret != 0))
 942                         return ret;
 943                 if (mem->mm_node)
 944                         break;
 945                 ret = ttm_mem_evict_first(bdev, mem_type,
 946                                           interruptible, no_wait_gpu);
 947                 if (unlikely(ret != 0))
 948                         return ret;
 949         } while (1);
 950         if (mem->mm_node == NULL)
 951                 return -ENOMEM;
 952         mem->mem_type = mem_type;
 953         return 0;
 954 }
 955
 956 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 957                                       uint32_t cur_placement,
 958                                       uint32_t proposed_placement)
 959 {
 960         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 961         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 962
 963         /**
 964          * Keep current caching if possible.
 965          */
 966
 967         if ((cur_placement & caching) != 0)
 968                 result |= (cur_placement & caching);
 969         else if ((man->default_caching & caching) != 0)
 970                 result |= man->default_caching;
 971         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 972                 result |= TTM_PL_FLAG_CACHED;
 973         else if ((TTM_PL_FLAG_WC & caching) != 0)
 974                 result |= TTM_PL_FLAG_WC;
 975         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 976                 result |= TTM_PL_FLAG_UNCACHED;
 977
 978         return result;
 979 }
 980
 981 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 982                                  uint32_t mem_type,
 983                                  uint32_t proposed_placement,
 984                                  uint32_t *masked_placement)
 985 {
 986         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 987
 988         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 989                 return false;
 990
 991         if ((proposed_placement & man->available_caching) == 0)
 992                 return false;
 993
 994         cur_flags |= (proposed_placement & man->available_caching);
 995
 996         *masked_placement = cur_flags;
 997         return true;
 998 }
 999
1000 /**
1001  * Creates space for memory region @mem according to its type.
1002  *
1003  * This function first searches for free space in compatible memory types in
1004  * the priority order defined by the driver.  If free space isn't found, then
1005  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1006  * space.
1007  */
1008 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1009                         struct ttm_placement *placement,
1010                         struct ttm_mem_reg *mem,
1011                         bool interruptible,
1012                         bool no_wait_gpu)
1013 {
1014         struct ttm_bo_device *bdev = bo->bdev;
1015         struct ttm_mem_type_manager *man;
1016         uint32_t mem_type = TTM_PL_SYSTEM;
1017         uint32_t cur_flags = 0;
1018         bool type_found = false;
1019         bool type_ok = false;
1020         bool has_erestartsys = false;
1021         int i, ret;
1022
1023         mem->mm_node = NULL;
1024         for (i = 0; i < placement->num_placement; ++i) {
1025                 ret = ttm_mem_type_from_flags(placement->placement[i],
1026                                                 &mem_type);
1027                 if (ret)
1028                         return ret;
1029                 man = &bdev->man[mem_type];
1030
1031                 type_ok = ttm_bo_mt_compatible(man,
1032                                                 mem_type,
1033                                                 placement->placement[i],
1034                                                 &cur_flags);
1035
1036                 if (!type_ok)
1037                         continue;
1038
1039                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1040                                                   cur_flags);
1041                 /*
1042                  * Use the access and other non-mapping-related flag bits from
1043                  * the memory placement flags to the current flags
1044                  */
1045                 ttm_flag_masked(&cur_flags, placement->placement[i],
1046                                 ~TTM_PL_MASK_MEMTYPE);
1047
1048                 if (mem_type == TTM_PL_SYSTEM)
1049                         break;
1050
1051                 if (man->has_type && man->use_type) {
1052                         type_found = true;
1053                         ret = (*man->func->get_node)(man, bo, placement, mem);
1054                         if (unlikely(ret))
1055                                 return ret;
1056                 }
1057                 if (mem->mm_node)
1058                         break;
1059         }
1060
1061         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1062                 mem->mem_type = mem_type;
1063                 mem->placement = cur_flags;
1064                 return 0;
1065         }
1066
1067         if (!type_found)
1068                 return -EINVAL;
1069
1070         for (i = 0; i < placement->num_busy_placement; ++i) {
1071                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1072                                                 &mem_type);
1073                 if (ret)
1074                         return ret;
1075                 man = &bdev->man[mem_type];
1076                 if (!man->has_type)
1077                         continue;
1078                 if (!ttm_bo_mt_compatible(man,
1079                                                 mem_type,
1080                                                 placement->busy_placement[i],
1081                                                 &cur_flags))
1082                         continue;
1083
1084                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1085                                                   cur_flags);
1086                 /*
1087                  * Use the access and other non-mapping-related flag bits from
1088                  * the memory placement flags to the current flags
1089                  */
1090                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1091                                 ~TTM_PL_MASK_MEMTYPE);
1092
1093
1094                 if (mem_type == TTM_PL_SYSTEM) {
1095                         mem->mem_type = mem_type;
1096                         mem->placement = cur_flags;
1097                         mem->mm_node = NULL;
1098                         return 0;
1099                 }
1100
1101                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1102                                                 interruptible, no_wait_gpu);
1103                 if (ret == 0 && mem->mm_node) {
1104                         mem->placement = cur_flags;
1105                         return 0;
1106                 }
1107                 if (ret == -ERESTARTSYS)
1108                         has_erestartsys = true;
1109         }
1110         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1111         return ret;
1112 }
1113 EXPORT_SYMBOL(ttm_bo_mem_space);
1114
1115 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1116                         struct ttm_placement *placement,
1117                         bool interruptible,
1118                         bool no_wait_gpu)
1119 {
1120         int ret = 0;
1121         struct ttm_mem_reg mem;
1122         struct ttm_bo_device *bdev = bo->bdev;
1123
1124         BUG_ON(!ttm_bo_is_reserved(bo));
1125
1126         /*
1127          * FIXME: It's possible to pipeline buffer moves.
1128          * Have the driver move function wait for idle when necessary,
1129          * instead of doing it here.
1130          */
1131         spin_lock(&bdev->fence_lock);
1132         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1133         spin_unlock(&bdev->fence_lock);
1134         if (ret)
1135                 return ret;
1136         mem.num_pages = bo->num_pages;
1137         mem.size = mem.num_pages << PAGE_SHIFT;
1138         mem.page_alignment = bo->mem.page_alignment;
1139         mem.bus.io_reserved_vm = false;
1140         mem.bus.io_reserved_count = 0;
1141         /*
1142          * Determine where to move the buffer.
1143          */
1144         ret = ttm_bo_mem_space(bo, placement, &mem,
1145                                interruptible, no_wait_gpu);
1146         if (ret)
1147                 goto out_unlock;
1148         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1149                                      interruptible, no_wait_gpu);
1150 out_unlock:
1151         if (ret && mem.mm_node)
1152                 ttm_bo_mem_put(bo, &mem);
1153         return ret;
1154 }
1155
1156 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1157                               struct ttm_mem_reg *mem,
1158                               uint32_t *new_flags)
1159 {
1160         int i;
1161
1162         if (mem->mm_node && placement->lpfn != 0 &&
1163             (mem->start < placement->fpfn ||
1164              mem->start + mem->num_pages > placement->lpfn))
1165                 return false;
1166
1167         for (i = 0; i < placement->num_placement; i++) {
1168                 *new_flags = placement->placement[i];
1169                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1170                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1171                         return true;
1172         }
1173
1174         for (i = 0; i < placement->num_busy_placement; i++) {
1175                 *new_flags = placement->busy_placement[i];
1176                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1177                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1178                         return true;
1179         }
1180
1181         return false;
1182 }
1183
1184 int ttm_bo_validate(struct ttm_buffer_object *bo,
1185                         struct ttm_placement *placement,
1186                         bool interruptible,
1187                         bool no_wait_gpu)
1188 {
1189         int ret;
1190         uint32_t new_flags;
1191
1192         BUG_ON(!ttm_bo_is_reserved(bo));
1193         /* Check that range is valid */
1194         if (placement->lpfn || placement->fpfn)
1195                 if (placement->fpfn > placement->lpfn ||
1196                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1197                         return -EINVAL;
1198         /*
1199          * Check whether we need to move buffer.
1200          */
1201         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1202                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1203                                          no_wait_gpu);
1204                 if (ret)
1205                         return ret;
1206         } else {
1207                 /*
1208                  * Use the access and other non-mapping-related flag bits from
1209                  * the compatible memory placement flags to the active flags
1210                  */
1211                 ttm_flag_masked(&bo->mem.placement, new_flags,
1212                                 ~TTM_PL_MASK_MEMTYPE);
1213         }
1214         /*
1215          * We might need to add a TTM.
1216          */
1217         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1218                 ret = ttm_bo_add_ttm(bo, true);
1219                 if (ret)
1220                         return ret;
1221         }
1222         return 0;
1223 }
1224 EXPORT_SYMBOL(ttm_bo_validate);
1225
1226 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1227                                 struct ttm_placement *placement)
1228 {
1229         BUG_ON((placement->fpfn || placement->lpfn) &&
1230                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1231
1232         return 0;
1233 }
1234
1235 int ttm_bo_init(struct ttm_bo_device *bdev,
1236                 struct ttm_buffer_object *bo,
1237                 unsigned long size,
1238                 enum ttm_bo_type type,
1239                 struct ttm_placement *placement,
1240                 uint32_t page_alignment,
1241                 bool interruptible,
1242                 struct file *persistent_swap_storage,
1243                 size_t acc_size,
1244                 struct sg_table *sg,
1245                 void (*destroy) (struct ttm_buffer_object *))
1246 {
1247         int ret = 0;
1248         unsigned long num_pages;
1249         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1250
1251         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1252         if (ret) {
1253                 pr_err("Out of kernel memory\n");
1254                 if (destroy)
1255                         (*destroy)(bo);
1256                 else
1257                         kfree(bo);
1258                 return -ENOMEM;
1259         }
1260
1261         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1262         if (num_pages == 0) {
1263                 pr_err("Illegal buffer object size\n");
1264                 if (destroy)
1265                         (*destroy)(bo);
1266                 else
1267                         kfree(bo);
1268                 ttm_mem_global_free(mem_glob, acc_size);
1269                 return -EINVAL;
1270         }
1271         bo->destroy = destroy;
1272
1273         kref_init(&bo->kref);
1274         kref_init(&bo->list_kref);
1275         atomic_set(&bo->cpu_writers, 0);
1276         atomic_set(&bo->reserved, 1);
1277         init_waitqueue_head(&bo->event_queue);
1278         INIT_LIST_HEAD(&bo->lru);
1279         INIT_LIST_HEAD(&bo->ddestroy);
1280         INIT_LIST_HEAD(&bo->swap);
1281         INIT_LIST_HEAD(&bo->io_reserve_lru);
1282         bo->bdev = bdev;
1283         bo->glob = bdev->glob;
1284         bo->type = type;
1285         bo->num_pages = num_pages;
1286         bo->mem.size = num_pages << PAGE_SHIFT;
1287         bo->mem.mem_type = TTM_PL_SYSTEM;
1288         bo->mem.num_pages = bo->num_pages;
1289         bo->mem.mm_node = NULL;
1290         bo->mem.page_alignment = page_alignment;
1291         bo->mem.bus.io_reserved_vm = false;
1292         bo->mem.bus.io_reserved_count = 0;
1293         bo->priv_flags = 0;
1294         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1295         bo->seq_valid = false;
1296         bo->persistent_swap_storage = persistent_swap_storage;
1297         bo->acc_size = acc_size;
1298         bo->sg = sg;
1299         atomic_inc(&bo->glob->bo_count);
1300
1301         ret = ttm_bo_check_placement(bo, placement);
1302         if (unlikely(ret != 0))
1303                 goto out_err;
1304
1305         /*
1306          * For ttm_bo_type_device buffers, allocate
1307          * address space from the device.
1308          */
1309         if (bo->type == ttm_bo_type_device ||
1310             bo->type == ttm_bo_type_sg) {
1311                 ret = ttm_bo_setup_vm(bo);
1312                 if (ret)
1313                         goto out_err;
1314         }
1315
1316         ret = ttm_bo_validate(bo, placement, interruptible, false);
1317         if (ret)
1318                 goto out_err;
1319
1320         ttm_bo_unreserve(bo);
1321         return 0;
1322
1323 out_err:
1324         ttm_bo_unreserve(bo);
1325         ttm_bo_unref(&bo);
1326
1327         return ret;
1328 }
1329 EXPORT_SYMBOL(ttm_bo_init);
1330
1331 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1332                        unsigned long bo_size,
1333                        unsigned struct_size)
1334 {
1335         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1336         size_t size = 0;
1337
1338         size += ttm_round_pot(struct_size);
1339         size += PAGE_ALIGN(npages * sizeof(void *));
1340         size += ttm_round_pot(sizeof(struct ttm_tt));
1341         return size;
1342 }
1343 EXPORT_SYMBOL(ttm_bo_acc_size);
1344
1345 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1346                            unsigned long bo_size,
1347                            unsigned struct_size)
1348 {
1349         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1350         size_t size = 0;
1351
1352         size += ttm_round_pot(struct_size);
1353         size += PAGE_ALIGN(npages * sizeof(void *));
1354         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1355         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1356         return size;
1357 }
1358 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1359
1360 int ttm_bo_create(struct ttm_bo_device *bdev,
1361                         unsigned long size,
1362                         enum ttm_bo_type type,
1363                         struct ttm_placement *placement,
1364                         uint32_t page_alignment,
1365                         bool interruptible,
1366                         struct file *persistent_swap_storage,
1367                         struct ttm_buffer_object **p_bo)
1368 {
1369         struct ttm_buffer_object *bo;
1370         size_t acc_size;
1371         int ret;
1372
1373         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1374         if (unlikely(bo == NULL))
1375                 return -ENOMEM;
1376
1377         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1378         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1379                           interruptible, persistent_swap_storage, acc_size,
1380                           NULL, NULL);
1381         if (likely(ret == 0))
1382                 *p_bo = bo;
1383
1384         return ret;
1385 }
1386 EXPORT_SYMBOL(ttm_bo_create);
1387
1388 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1389                                         unsigned mem_type, bool allow_errors)
1390 {
1391         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1392         struct ttm_bo_global *glob = bdev->glob;
1393         int ret;
1394
1395         /*
1396          * Can't use standard list traversal since we're unlocking.
1397          */
1398
1399         spin_lock(&glob->lru_lock);
1400         while (!list_empty(&man->lru)) {
1401                 spin_unlock(&glob->lru_lock);
1402                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1403                 if (ret) {
1404                         if (allow_errors) {
1405                                 return ret;
1406                         } else {
1407                                 pr_err("Cleanup eviction failed\n");
1408                         }
1409                 }
1410                 spin_lock(&glob->lru_lock);
1411         }
1412         spin_unlock(&glob->lru_lock);
1413         return 0;
1414 }
1415
1416 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1417 {
1418         struct ttm_mem_type_manager *man;
1419         int ret = -EINVAL;
1420
1421         if (mem_type >= TTM_NUM_MEM_TYPES) {
1422                 pr_err("Illegal memory type %d\n", mem_type);
1423                 return ret;
1424         }
1425         man = &bdev->man[mem_type];
1426
1427         if (!man->has_type) {
1428                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1429                        mem_type);
1430                 return ret;
1431         }
1432
1433         man->use_type = false;
1434         man->has_type = false;
1435
1436         ret = 0;
1437         if (mem_type > 0) {
1438                 ttm_bo_force_list_clean(bdev, mem_type, false);
1439
1440                 ret = (*man->func->takedown)(man);
1441         }
1442
1443         return ret;
1444 }
1445 EXPORT_SYMBOL(ttm_bo_clean_mm);
1446
1447 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1448 {
1449         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1450
1451         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1452                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1453                 return -EINVAL;
1454         }
1455
1456         if (!man->has_type) {
1457                 pr_err("Memory type %u has not been initialized\n", mem_type);
1458                 return 0;
1459         }
1460
1461         return ttm_bo_force_list_clean(bdev, mem_type, true);
1462 }
1463 EXPORT_SYMBOL(ttm_bo_evict_mm);
1464
1465 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1466                         unsigned long p_size)
1467 {
1468         int ret = -EINVAL;
1469         struct ttm_mem_type_manager *man;
1470
1471         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1472         man = &bdev->man[type];
1473         BUG_ON(man->has_type);
1474         man->io_reserve_fastpath = true;
1475         man->use_io_reserve_lru = false;
1476         mutex_init(&man->io_reserve_mutex);
1477         INIT_LIST_HEAD(&man->io_reserve_lru);
1478
1479         ret = bdev->driver->init_mem_type(bdev, type, man);
1480         if (ret)
1481                 return ret;
1482         man->bdev = bdev;
1483
1484         ret = 0;
1485         if (type != TTM_PL_SYSTEM) {
1486                 ret = (*man->func->init)(man, p_size);
1487                 if (ret)
1488                         return ret;
1489         }
1490         man->has_type = true;
1491         man->use_type = true;
1492         man->size = p_size;
1493
1494         INIT_LIST_HEAD(&man->lru);
1495
1496         return 0;
1497 }
1498 EXPORT_SYMBOL(ttm_bo_init_mm);
1499
1500 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1501 {
1502         struct ttm_bo_global *glob =
1503                 container_of(kobj, struct ttm_bo_global, kobj);
1504
1505         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1506         __free_page(glob->dummy_read_page);
1507         kfree(glob);
1508 }
1509
1510 void ttm_bo_global_release(struct drm_global_reference *ref)
1511 {
1512         struct ttm_bo_global *glob = ref->object;
1513
1514         kobject_del(&glob->kobj);
1515         kobject_put(&glob->kobj);
1516 }
1517 EXPORT_SYMBOL(ttm_bo_global_release);
1518
1519 int ttm_bo_global_init(struct drm_global_reference *ref)
1520 {
1521         struct ttm_bo_global_ref *bo_ref =
1522                 container_of(ref, struct ttm_bo_global_ref, ref);
1523         struct ttm_bo_global *glob = ref->object;
1524         int ret;
1525
1526         mutex_init(&glob->device_list_mutex);
1527         spin_lock_init(&glob->lru_lock);
1528         glob->mem_glob = bo_ref->mem_glob;
1529         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1530
1531         if (unlikely(glob->dummy_read_page == NULL)) {
1532                 ret = -ENOMEM;
1533                 goto out_no_drp;
1534         }
1535
1536         INIT_LIST_HEAD(&glob->swap_lru);
1537         INIT_LIST_HEAD(&glob->device_list);
1538
1539         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1540         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1541         if (unlikely(ret != 0)) {
1542                 pr_err("Could not register buffer object swapout\n");
1543                 goto out_no_shrink;
1544         }
1545
1546         atomic_set(&glob->bo_count, 0);
1547
1548         ret = kobject_init_and_add(
1549                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1550         if (unlikely(ret != 0))
1551                 kobject_put(&glob->kobj);
1552         return ret;
1553 out_no_shrink:
1554         __free_page(glob->dummy_read_page);
1555 out_no_drp:
1556         kfree(glob);
1557         return ret;
1558 }
1559 EXPORT_SYMBOL(ttm_bo_global_init);
1560
1561
1562 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1563 {
1564         int ret = 0;
1565         unsigned i = TTM_NUM_MEM_TYPES;
1566         struct ttm_mem_type_manager *man;
1567         struct ttm_bo_global *glob = bdev->glob;
1568
1569         while (i--) {
1570                 man = &bdev->man[i];
1571                 if (man->has_type) {
1572                         man->use_type = false;
1573                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1574                                 ret = -EBUSY;
1575                                 pr_err("DRM memory manager type %d is not clean\n",
1576                                        i);
1577                         }
1578                         man->has_type = false;
1579                 }
1580         }
1581
1582         mutex_lock(&glob->device_list_mutex);
1583         list_del(&bdev->device_list);
1584         mutex_unlock(&glob->device_list_mutex);
1585
1586         cancel_delayed_work_sync(&bdev->wq);
1587
1588         while (ttm_bo_delayed_delete(bdev, true))
1589                 ;
1590
1591         spin_lock(&glob->lru_lock);
1592         if (list_empty(&bdev->ddestroy))
1593                 TTM_DEBUG("Delayed destroy list was clean\n");
1594
1595         if (list_empty(&bdev->man[0].lru))
1596                 TTM_DEBUG("Swap list was clean\n");
1597         spin_unlock(&glob->lru_lock);
1598
1599         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1600         write_lock(&bdev->vm_lock);
1601         drm_mm_takedown(&bdev->addr_space_mm);
1602         write_unlock(&bdev->vm_lock);
1603
1604         return ret;
1605 }
1606 EXPORT_SYMBOL(ttm_bo_device_release);
1607
1608 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1609                        struct ttm_bo_global *glob,
1610                        struct ttm_bo_driver *driver,
1611                        uint64_t file_page_offset,
1612                        bool need_dma32)
1613 {
1614         int ret = -EINVAL;
1615
1616         rwlock_init(&bdev->vm_lock);
1617         bdev->driver = driver;
1618
1619         memset(bdev->man, 0, sizeof(bdev->man));
1620
1621         /*
1622          * Initialize the system memory buffer type.
1623          * Other types need to be driver / IOCTL initialized.
1624          */
1625         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1626         if (unlikely(ret != 0))
1627                 goto out_no_sys;
1628
1629         bdev->addr_space_rb = RB_ROOT;
1630         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1631         if (unlikely(ret != 0))
1632                 goto out_no_addr_mm;
1633
1634         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1635         INIT_LIST_HEAD(&bdev->ddestroy);
1636         bdev->dev_mapping = NULL;
1637         bdev->glob = glob;
1638         bdev->need_dma32 = need_dma32;
1639         bdev->val_seq = 0;
1640         spin_lock_init(&bdev->fence_lock);
1641         mutex_lock(&glob->device_list_mutex);
1642         list_add_tail(&bdev->device_list, &glob->device_list);
1643         mutex_unlock(&glob->device_list_mutex);
1644
1645         return 0;
1646 out_no_addr_mm:
1647         ttm_bo_clean_mm(bdev, 0);
1648 out_no_sys:
1649         return ret;
1650 }
1651 EXPORT_SYMBOL(ttm_bo_device_init);
1652
1653 /*
1654  * buffer object vm functions.
1655  */
1656
1657 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1658 {
1659         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1660
1661         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1662                 if (mem->mem_type == TTM_PL_SYSTEM)
1663                         return false;
1664
1665                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1666                         return false;
1667
1668                 if (mem->placement & TTM_PL_FLAG_CACHED)
1669                         return false;
1670         }
1671         return true;
1672 }
1673
1674 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1675 {
1676         struct ttm_bo_device *bdev = bo->bdev;
1677         loff_t offset = (loff_t) bo->addr_space_offset;
1678         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1679
1680         if (!bdev->dev_mapping)
1681                 return;
1682         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1683         ttm_mem_io_free_vm(bo);
1684 }
1685
1686 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1687 {
1688         struct ttm_bo_device *bdev = bo->bdev;
1689         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1690
1691         ttm_mem_io_lock(man, false);
1692         ttm_bo_unmap_virtual_locked(bo);
1693         ttm_mem_io_unlock(man);
1694 }
1695
1696
1697 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1698
1699 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1700 {
1701         struct ttm_bo_device *bdev = bo->bdev;
1702         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1703         struct rb_node *parent = NULL;
1704         struct ttm_buffer_object *cur_bo;
1705         unsigned long offset = bo->vm_node->start;
1706         unsigned long cur_offset;
1707
1708         while (*cur) {
1709                 parent = *cur;
1710                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1711                 cur_offset = cur_bo->vm_node->start;
1712                 if (offset < cur_offset)
1713                         cur = &parent->rb_left;
1714                 else if (offset > cur_offset)
1715                         cur = &parent->rb_right;
1716                 else
1717                         BUG();
1718         }
1719
1720         rb_link_node(&bo->vm_rb, parent, cur);
1721         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1722 }
1723
1724 /**
1725  * ttm_bo_setup_vm:
1726  *
1727  * @bo: the buffer to allocate address space for
1728  *
1729  * Allocate address space in the drm device so that applications
1730  * can mmap the buffer and access the contents. This only
1731  * applies to ttm_bo_type_device objects as others are not
1732  * placed in the drm device address space.
1733  */
1734
1735 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1736 {
1737         struct ttm_bo_device *bdev = bo->bdev;
1738         int ret;
1739
1740 retry_pre_get:
1741         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1742         if (unlikely(ret != 0))
1743                 return ret;
1744
1745         write_lock(&bdev->vm_lock);
1746         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1747                                          bo->mem.num_pages, 0, 0);
1748
1749         if (unlikely(bo->vm_node == NULL)) {
1750                 ret = -ENOMEM;
1751                 goto out_unlock;
1752         }
1753
1754         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1755                                               bo->mem.num_pages, 0);
1756
1757         if (unlikely(bo->vm_node == NULL)) {
1758                 write_unlock(&bdev->vm_lock);
1759                 goto retry_pre_get;
1760         }
1761
1762         ttm_bo_vm_insert_rb(bo);
1763         write_unlock(&bdev->vm_lock);
1764         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1765
1766         return 0;
1767 out_unlock:
1768         write_unlock(&bdev->vm_lock);
1769         return ret;
1770 }
1771
1772 int ttm_bo_wait(struct ttm_buffer_object *bo,
1773                 bool lazy, bool interruptible, bool no_wait)
1774 {
1775         struct ttm_bo_driver *driver = bo->bdev->driver;
1776         struct ttm_bo_device *bdev = bo->bdev;
1777         void *sync_obj;
1778         int ret = 0;
1779
1780         if (likely(bo->sync_obj == NULL))
1781                 return 0;
1782
1783         while (bo->sync_obj) {
1784
1785                 if (driver->sync_obj_signaled(bo->sync_obj)) {
1786                         void *tmp_obj = bo->sync_obj;
1787                         bo->sync_obj = NULL;
1788                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1789                         spin_unlock(&bdev->fence_lock);
1790                         driver->sync_obj_unref(&tmp_obj);
1791                         spin_lock(&bdev->fence_lock);
1792                         continue;
1793                 }
1794
1795                 if (no_wait)
1796                         return -EBUSY;
1797
1798                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1799                 spin_unlock(&bdev->fence_lock);
1800                 ret = driver->sync_obj_wait(sync_obj,
1801                                             lazy, interruptible);
1802                 if (unlikely(ret != 0)) {
1803                         driver->sync_obj_unref(&sync_obj);
1804                         spin_lock(&bdev->fence_lock);
1805                         return ret;
1806                 }
1807                 spin_lock(&bdev->fence_lock);
1808                 if (likely(bo->sync_obj == sync_obj)) {
1809                         void *tmp_obj = bo->sync_obj;
1810                         bo->sync_obj = NULL;
1811                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1812                                   &bo->priv_flags);
1813                         spin_unlock(&bdev->fence_lock);
1814                         driver->sync_obj_unref(&sync_obj);
1815                         driver->sync_obj_unref(&tmp_obj);
1816                         spin_lock(&bdev->fence_lock);
1817                 } else {
1818                         spin_unlock(&bdev->fence_lock);
1819                         driver->sync_obj_unref(&sync_obj);
1820                         spin_lock(&bdev->fence_lock);
1821                 }
1822         }
1823         return 0;
1824 }
1825 EXPORT_SYMBOL(ttm_bo_wait);
1826
1827 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1828 {
1829         struct ttm_bo_device *bdev = bo->bdev;
1830         int ret = 0;
1831
1832         /*
1833          * Using ttm_bo_reserve makes sure the lru lists are updated.
1834          */
1835
1836         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1837         if (unlikely(ret != 0))
1838                 return ret;
1839         spin_lock(&bdev->fence_lock);
1840         ret = ttm_bo_wait(bo, false, true, no_wait);
1841         spin_unlock(&bdev->fence_lock);
1842         if (likely(ret == 0))
1843                 atomic_inc(&bo->cpu_writers);
1844         ttm_bo_unreserve(bo);
1845         return ret;
1846 }
1847 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1848
1849 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1850 {
1851         atomic_dec(&bo->cpu_writers);
1852 }
1853 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1854
1855 /**
1856  * A buffer object shrink method that tries to swap out the first
1857  * buffer object on the bo_global::swap_lru list.
1858  */
1859
1860 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1861 {
1862         struct ttm_bo_global *glob =
1863             container_of(shrink, struct ttm_bo_global, shrink);
1864         struct ttm_buffer_object *bo;
1865         int ret = -EBUSY;
1866         int put_count;
1867         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1868
1869         spin_lock(&glob->lru_lock);
1870         list_for_each_entry(bo, &glob->swap_lru, swap) {
1871                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1872                 if (!ret)
1873                         break;
1874         }
1875
1876         if (ret) {
1877                 spin_unlock(&glob->lru_lock);
1878                 return ret;
1879         }
1880
1881         kref_get(&bo->list_kref);
1882
1883         if (!list_empty(&bo->ddestroy)) {
1884                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1885                 kref_put(&bo->list_kref, ttm_bo_release_list);
1886                 return ret;
1887         }
1888
1889         put_count = ttm_bo_del_from_lru(bo);
1890         spin_unlock(&glob->lru_lock);
1891
1892         ttm_bo_list_ref_sub(bo, put_count, true);
1893
1894         /**
1895          * Wait for GPU, then move to system cached.
1896          */
1897
1898         spin_lock(&bo->bdev->fence_lock);
1899         ret = ttm_bo_wait(bo, false, false, false);
1900         spin_unlock(&bo->bdev->fence_lock);
1901
1902         if (unlikely(ret != 0))
1903                 goto out;
1904
1905         if ((bo->mem.placement & swap_placement) != swap_placement) {
1906                 struct ttm_mem_reg evict_mem;
1907
1908                 evict_mem = bo->mem;
1909                 evict_mem.mm_node = NULL;
1910                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1911                 evict_mem.mem_type = TTM_PL_SYSTEM;
1912
1913                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1914                                              false, false);
1915                 if (unlikely(ret != 0))
1916                         goto out;
1917         }
1918
1919         ttm_bo_unmap_virtual(bo);
1920
1921         /**
1922          * Swap out. Buffer will be swapped in again as soon as
1923          * anyone tries to access a ttm page.
1924          */
1925
1926         if (bo->bdev->driver->swap_notify)
1927                 bo->bdev->driver->swap_notify(bo);
1928
1929         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1930 out:
1931
1932         /**
1933          *
1934          * Unreserve without putting on LRU to avoid swapping out an
1935          * already swapped buffer.
1936          */
1937
1938         atomic_set(&bo->reserved, 0);
1939         wake_up_all(&bo->event_queue);
1940         kref_put(&bo->list_kref, ttm_bo_release_list);
1941         return ret;
1942 }
1943
1944 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1945 {
1946         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1947                 ;
1948 }
1949 EXPORT_SYMBOL(ttm_bo_swapout_all);