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