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 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 retry_reserve:
 584         spin_lock(&glob->lru_lock);
 585
 586         if (unlikely(list_empty(&bo->ddestroy))) {
 587                 spin_unlock(&glob->lru_lock);
 588                 return 0;
 589         }
 590
 591         ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
 592
 593         if (unlikely(ret == -EBUSY)) {
 594                 spin_unlock(&glob->lru_lock);
 595                 if (likely(!no_wait_reserve))
 596                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 597                 if (unlikely(ret != 0))
 598                         return ret;
 599
 600                 goto retry_reserve;
 601         }
 602
 603         BUG_ON(ret != 0);
 604
 605         /**
 606          * We can re-check for sync object without taking
 607          * the bo::lock since setting the sync object requires
 608          * also bo::reserved. A busy object at this point may
 609          * be caused by another thread recently starting an accelerated
 610          * eviction.
 611          */
 612
 613         if (unlikely(bo->sync_obj)) {
 614                 atomic_set(&bo->reserved, 0);
 615                 wake_up_all(&bo->event_queue);
 616                 spin_unlock(&glob->lru_lock);
 617                 goto retry;
 618         }
 619
 620         put_count = ttm_bo_del_from_lru(bo);
 621         list_del_init(&bo->ddestroy);
 622         ++put_count;
 623
 624         spin_unlock(&glob->lru_lock);
 625         ttm_bo_cleanup_memtype_use(bo);
 626
 627         ttm_bo_list_ref_sub(bo, put_count, true);
 628
 629         return 0;
 630 }
 631
 632 /**
 633  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 634  * encountered buffers.
 635  */
 636
 637 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 638 {
 639         struct ttm_bo_global *glob = bdev->glob;
 640         struct ttm_buffer_object *entry = NULL;
 641         int ret = 0;
 642
 643         spin_lock(&glob->lru_lock);
 644         if (list_empty(&bdev->ddestroy))
 645                 goto out_unlock;
 646
 647         entry = list_first_entry(&bdev->ddestroy,
 648                 struct ttm_buffer_object, ddestroy);
 649         kref_get(&entry->list_kref);
 650
 651         for (;;) {
 652                 struct ttm_buffer_object *nentry = NULL;
 653
 654                 if (entry->ddestroy.next != &bdev->ddestroy) {
 655                         nentry = list_first_entry(&entry->ddestroy,
 656                                 struct ttm_buffer_object, ddestroy);
 657                         kref_get(&nentry->list_kref);
 658                 }
 659
 660                 spin_unlock(&glob->lru_lock);
 661                 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
 662                                           !remove_all);
 663                 kref_put(&entry->list_kref, ttm_bo_release_list);
 664                 entry = nentry;
 665
 666                 if (ret || !entry)
 667                         goto out;
 668
 669                 spin_lock(&glob->lru_lock);
 670                 if (list_empty(&entry->ddestroy))
 671                         break;
 672         }
 673
 674 out_unlock:
 675         spin_unlock(&glob->lru_lock);
 676 out:
 677         if (entry)
 678                 kref_put(&entry->list_kref, ttm_bo_release_list);
 679         return ret;
 680 }
 681
 682 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 683 {
 684         struct ttm_bo_device *bdev =
 685             container_of(work, struct ttm_bo_device, wq.work);
 686
 687         if (ttm_bo_delayed_delete(bdev, false)) {
 688                 schedule_delayed_work(&bdev->wq,
 689                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 690         }
 691 }
 692
 693 static void ttm_bo_release(struct kref *kref)
 694 {
 695         struct ttm_buffer_object *bo =
 696             container_of(kref, struct ttm_buffer_object, kref);
 697         struct ttm_bo_device *bdev = bo->bdev;
 698         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 699
 700         if (likely(bo->vm_node != NULL)) {
 701                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 702                 drm_mm_put_block(bo->vm_node);
 703                 bo->vm_node = NULL;
 704         }
 705         write_unlock(&bdev->vm_lock);
 706         ttm_mem_io_lock(man, false);
 707         ttm_mem_io_free_vm(bo);
 708         ttm_mem_io_unlock(man);
 709         ttm_bo_cleanup_refs_or_queue(bo);
 710         kref_put(&bo->list_kref, ttm_bo_release_list);
 711         write_lock(&bdev->vm_lock);
 712 }
 713
 714 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 715 {
 716         struct ttm_buffer_object *bo = *p_bo;
 717         struct ttm_bo_device *bdev = bo->bdev;
 718
 719         *p_bo = NULL;
 720         write_lock(&bdev->vm_lock);
 721         kref_put(&bo->kref, ttm_bo_release);
 722         write_unlock(&bdev->vm_lock);
 723 }
 724 EXPORT_SYMBOL(ttm_bo_unref);
 725
 726 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 727 {
 728         return cancel_delayed_work_sync(&bdev->wq);
 729 }
 730 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 731
 732 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 733 {
 734         if (resched)
 735                 schedule_delayed_work(&bdev->wq,
 736                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 737 }
 738 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 739
 740 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 741                         bool no_wait_reserve, bool no_wait_gpu)
 742 {
 743         struct ttm_bo_device *bdev = bo->bdev;
 744         struct ttm_mem_reg evict_mem;
 745         struct ttm_placement placement;
 746         int ret = 0;
 747
 748         spin_lock(&bdev->fence_lock);
 749         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 750         spin_unlock(&bdev->fence_lock);
 751
 752         if (unlikely(ret != 0)) {
 753                 if (ret != -ERESTARTSYS) {
 754                         pr_err("Failed to expire sync object before buffer eviction\n");
 755                 }
 756                 goto out;
 757         }
 758
 759         BUG_ON(!atomic_read(&bo->reserved));
 760
 761         evict_mem = bo->mem;
 762         evict_mem.mm_node = NULL;
 763         evict_mem.bus.io_reserved_vm = false;
 764         evict_mem.bus.io_reserved_count = 0;
 765
 766         placement.fpfn = 0;
 767         placement.lpfn = 0;
 768         placement.num_placement = 0;
 769         placement.num_busy_placement = 0;
 770         bdev->driver->evict_flags(bo, &placement);
 771         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 772                                 no_wait_reserve, no_wait_gpu);
 773         if (ret) {
 774                 if (ret != -ERESTARTSYS) {
 775                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 776                                bo);
 777                         ttm_bo_mem_space_debug(bo, &placement);
 778                 }
 779                 goto out;
 780         }
 781
 782         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 783                                      no_wait_reserve, no_wait_gpu);
 784         if (ret) {
 785                 if (ret != -ERESTARTSYS)
 786                         pr_err("Buffer eviction failed\n");
 787                 ttm_bo_mem_put(bo, &evict_mem);
 788                 goto out;
 789         }
 790         bo->evicted = true;
 791 out:
 792         return ret;
 793 }
 794
 795 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 796                                 uint32_t mem_type,
 797                                 bool interruptible, bool no_wait_reserve,
 798                                 bool no_wait_gpu)
 799 {
 800         struct ttm_bo_global *glob = bdev->glob;
 801         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 802         struct ttm_buffer_object *bo;
 803         int ret, put_count = 0;
 804
 805 retry:
 806         spin_lock(&glob->lru_lock);
 807         if (list_empty(&man->lru)) {
 808                 spin_unlock(&glob->lru_lock);
 809                 return -EBUSY;
 810         }
 811
 812         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 813         kref_get(&bo->list_kref);
 814
 815         if (!list_empty(&bo->ddestroy)) {
 816                 spin_unlock(&glob->lru_lock);
 817                 ret = ttm_bo_cleanup_refs(bo, interruptible,
 818                                           no_wait_reserve, no_wait_gpu);
 819                 kref_put(&bo->list_kref, ttm_bo_release_list);
 820
 821                 return ret;
 822         }
 823
 824         ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
 825
 826         if (unlikely(ret == -EBUSY)) {
 827                 spin_unlock(&glob->lru_lock);
 828                 if (likely(!no_wait_reserve))
 829                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 830
 831                 kref_put(&bo->list_kref, ttm_bo_release_list);
 832
 833                 /**
 834                  * We *need* to retry after releasing the lru lock.
 835                  */
 836
 837                 if (unlikely(ret != 0))
 838                         return ret;
 839                 goto retry;
 840         }
 841
 842         put_count = ttm_bo_del_from_lru(bo);
 843         spin_unlock(&glob->lru_lock);
 844
 845         BUG_ON(ret != 0);
 846
 847         ttm_bo_list_ref_sub(bo, put_count, true);
 848
 849         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 850         ttm_bo_unreserve(bo);
 851
 852         kref_put(&bo->list_kref, ttm_bo_release_list);
 853         return ret;
 854 }
 855
 856 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 857 {
 858         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 859
 860         if (mem->mm_node)
 861                 (*man->func->put_node)(man, mem);
 862 }
 863 EXPORT_SYMBOL(ttm_bo_mem_put);
 864
 865 /**
 866  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 867  * space, or we've evicted everything and there isn't enough space.
 868  */
 869 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 870                                         uint32_t mem_type,
 871                                         struct ttm_placement *placement,
 872                                         struct ttm_mem_reg *mem,
 873                                         bool interruptible,
 874                                         bool no_wait_reserve,
 875                                         bool no_wait_gpu)
 876 {
 877         struct ttm_bo_device *bdev = bo->bdev;
 878         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 879         int ret;
 880
 881         do {
 882                 ret = (*man->func->get_node)(man, bo, placement, mem);
 883                 if (unlikely(ret != 0))
 884                         return ret;
 885                 if (mem->mm_node)
 886                         break;
 887                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 888                                                 no_wait_reserve, no_wait_gpu);
 889                 if (unlikely(ret != 0))
 890                         return ret;
 891         } while (1);
 892         if (mem->mm_node == NULL)
 893                 return -ENOMEM;
 894         mem->mem_type = mem_type;
 895         return 0;
 896 }
 897
 898 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 899                                       uint32_t cur_placement,
 900                                       uint32_t proposed_placement)
 901 {
 902         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 903         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 904
 905         /**
 906          * Keep current caching if possible.
 907          */
 908
 909         if ((cur_placement & caching) != 0)
 910                 result |= (cur_placement & caching);
 911         else if ((man->default_caching & caching) != 0)
 912                 result |= man->default_caching;
 913         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 914                 result |= TTM_PL_FLAG_CACHED;
 915         else if ((TTM_PL_FLAG_WC & caching) != 0)
 916                 result |= TTM_PL_FLAG_WC;
 917         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 918                 result |= TTM_PL_FLAG_UNCACHED;
 919
 920         return result;
 921 }
 922
 923 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 924                                  uint32_t mem_type,
 925                                  uint32_t proposed_placement,
 926                                  uint32_t *masked_placement)
 927 {
 928         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 929
 930         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 931                 return false;
 932
 933         if ((proposed_placement & man->available_caching) == 0)
 934                 return false;
 935
 936         cur_flags |= (proposed_placement & man->available_caching);
 937
 938         *masked_placement = cur_flags;
 939         return true;
 940 }
 941
 942 /**
 943  * Creates space for memory region @mem according to its type.
 944  *
 945  * This function first searches for free space in compatible memory types in
 946  * the priority order defined by the driver.  If free space isn't found, then
 947  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 948  * space.
 949  */
 950 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 951                         struct ttm_placement *placement,
 952                         struct ttm_mem_reg *mem,
 953                         bool interruptible, bool no_wait_reserve,
 954                         bool no_wait_gpu)
 955 {
 956         struct ttm_bo_device *bdev = bo->bdev;
 957         struct ttm_mem_type_manager *man;
 958         uint32_t mem_type = TTM_PL_SYSTEM;
 959         uint32_t cur_flags = 0;
 960         bool type_found = false;
 961         bool type_ok = false;
 962         bool has_erestartsys = false;
 963         int i, ret;
 964
 965         mem->mm_node = NULL;
 966         for (i = 0; i < placement->num_placement; ++i) {
 967                 ret = ttm_mem_type_from_flags(placement->placement[i],
 968                                                 &mem_type);
 969                 if (ret)
 970                         return ret;
 971                 man = &bdev->man[mem_type];
 972
 973                 type_ok = ttm_bo_mt_compatible(man,
 974                                                 mem_type,
 975                                                 placement->placement[i],
 976                                                 &cur_flags);
 977
 978                 if (!type_ok)
 979                         continue;
 980
 981                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 982                                                   cur_flags);
 983                 /*
 984                  * Use the access and other non-mapping-related flag bits from
 985                  * the memory placement flags to the current flags
 986                  */
 987                 ttm_flag_masked(&cur_flags, placement->placement[i],
 988                                 ~TTM_PL_MASK_MEMTYPE);
 989
 990                 if (mem_type == TTM_PL_SYSTEM)
 991                         break;
 992
 993                 if (man->has_type && man->use_type) {
 994                         type_found = true;
 995                         ret = (*man->func->get_node)(man, bo, placement, mem);
 996                         if (unlikely(ret))
 997                                 return ret;
 998                 }
 999                 if (mem->mm_node)
1000                         break;
1001         }
1002
1003         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1004                 mem->mem_type = mem_type;
1005                 mem->placement = cur_flags;
1006                 return 0;
1007         }
1008
1009         if (!type_found)
1010                 return -EINVAL;
1011
1012         for (i = 0; i < placement->num_busy_placement; ++i) {
1013                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1014                                                 &mem_type);
1015                 if (ret)
1016                         return ret;
1017                 man = &bdev->man[mem_type];
1018                 if (!man->has_type)
1019                         continue;
1020                 if (!ttm_bo_mt_compatible(man,
1021                                                 mem_type,
1022                                                 placement->busy_placement[i],
1023                                                 &cur_flags))
1024                         continue;
1025
1026                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1027                                                   cur_flags);
1028                 /*
1029                  * Use the access and other non-mapping-related flag bits from
1030                  * the memory placement flags to the current flags
1031                  */
1032                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1033                                 ~TTM_PL_MASK_MEMTYPE);
1034
1035
1036                 if (mem_type == TTM_PL_SYSTEM) {
1037                         mem->mem_type = mem_type;
1038                         mem->placement = cur_flags;
1039                         mem->mm_node = NULL;
1040                         return 0;
1041                 }
1042
1043                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1044                                                 interruptible, no_wait_reserve, no_wait_gpu);
1045                 if (ret == 0 && mem->mm_node) {
1046                         mem->placement = cur_flags;
1047                         return 0;
1048                 }
1049                 if (ret == -ERESTARTSYS)
1050                         has_erestartsys = true;
1051         }
1052         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1053         return ret;
1054 }
1055 EXPORT_SYMBOL(ttm_bo_mem_space);
1056
1057 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1058 {
1059         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1060                 return -EBUSY;
1061
1062         return wait_event_interruptible(bo->event_queue,
1063                                         atomic_read(&bo->cpu_writers) == 0);
1064 }
1065 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1066
1067 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1068                         struct ttm_placement *placement,
1069                         bool interruptible, bool no_wait_reserve,
1070                         bool no_wait_gpu)
1071 {
1072         int ret = 0;
1073         struct ttm_mem_reg mem;
1074         struct ttm_bo_device *bdev = bo->bdev;
1075
1076         BUG_ON(!atomic_read(&bo->reserved));
1077
1078         /*
1079          * FIXME: It's possible to pipeline buffer moves.
1080          * Have the driver move function wait for idle when necessary,
1081          * instead of doing it here.
1082          */
1083         spin_lock(&bdev->fence_lock);
1084         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1085         spin_unlock(&bdev->fence_lock);
1086         if (ret)
1087                 return ret;
1088         mem.num_pages = bo->num_pages;
1089         mem.size = mem.num_pages << PAGE_SHIFT;
1090         mem.page_alignment = bo->mem.page_alignment;
1091         mem.bus.io_reserved_vm = false;
1092         mem.bus.io_reserved_count = 0;
1093         /*
1094          * Determine where to move the buffer.
1095          */
1096         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1097         if (ret)
1098                 goto out_unlock;
1099         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1100 out_unlock:
1101         if (ret && mem.mm_node)
1102                 ttm_bo_mem_put(bo, &mem);
1103         return ret;
1104 }
1105
1106 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1107                              struct ttm_mem_reg *mem)
1108 {
1109         int i;
1110
1111         if (mem->mm_node && placement->lpfn != 0 &&
1112             (mem->start < placement->fpfn ||
1113              mem->start + mem->num_pages > placement->lpfn))
1114                 return -1;
1115
1116         for (i = 0; i < placement->num_placement; i++) {
1117                 if ((placement->placement[i] & mem->placement &
1118                         TTM_PL_MASK_CACHING) &&
1119                         (placement->placement[i] & mem->placement &
1120                         TTM_PL_MASK_MEM))
1121                         return i;
1122         }
1123         return -1;
1124 }
1125
1126 int ttm_bo_validate(struct ttm_buffer_object *bo,
1127                         struct ttm_placement *placement,
1128                         bool interruptible, bool no_wait_reserve,
1129                         bool no_wait_gpu)
1130 {
1131         int ret;
1132
1133         BUG_ON(!atomic_read(&bo->reserved));
1134         /* Check that range is valid */
1135         if (placement->lpfn || placement->fpfn)
1136                 if (placement->fpfn > placement->lpfn ||
1137                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1138                         return -EINVAL;
1139         /*
1140          * Check whether we need to move buffer.
1141          */
1142         ret = ttm_bo_mem_compat(placement, &bo->mem);
1143         if (ret < 0) {
1144                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1145                 if (ret)
1146                         return ret;
1147         } else {
1148                 /*
1149                  * Use the access and other non-mapping-related flag bits from
1150                  * the compatible memory placement flags to the active flags
1151                  */
1152                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1153                                 ~TTM_PL_MASK_MEMTYPE);
1154         }
1155         /*
1156          * We might need to add a TTM.
1157          */
1158         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1159                 ret = ttm_bo_add_ttm(bo, true);
1160                 if (ret)
1161                         return ret;
1162         }
1163         return 0;
1164 }
1165 EXPORT_SYMBOL(ttm_bo_validate);
1166
1167 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1168                                 struct ttm_placement *placement)
1169 {
1170         BUG_ON((placement->fpfn || placement->lpfn) &&
1171                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1172
1173         return 0;
1174 }
1175
1176 int ttm_bo_init(struct ttm_bo_device *bdev,
1177                 struct ttm_buffer_object *bo,
1178                 unsigned long size,
1179                 enum ttm_bo_type type,
1180                 struct ttm_placement *placement,
1181                 uint32_t page_alignment,
1182                 unsigned long buffer_start,
1183                 bool interruptible,
1184                 struct file *persistent_swap_storage,
1185                 size_t acc_size,
1186                 struct sg_table *sg,
1187                 void (*destroy) (struct ttm_buffer_object *))
1188 {
1189         int ret = 0;
1190         unsigned long num_pages;
1191         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1192
1193         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1194         if (ret) {
1195                 pr_err("Out of kernel memory\n");
1196                 if (destroy)
1197                         (*destroy)(bo);
1198                 else
1199                         kfree(bo);
1200                 return -ENOMEM;
1201         }
1202
1203         size += buffer_start & ~PAGE_MASK;
1204         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1205         if (num_pages == 0) {
1206                 pr_err("Illegal buffer object size\n");
1207                 if (destroy)
1208                         (*destroy)(bo);
1209                 else
1210                         kfree(bo);
1211                 ttm_mem_global_free(mem_glob, acc_size);
1212                 return -EINVAL;
1213         }
1214         bo->destroy = destroy;
1215
1216         kref_init(&bo->kref);
1217         kref_init(&bo->list_kref);
1218         atomic_set(&bo->cpu_writers, 0);
1219         atomic_set(&bo->reserved, 1);
1220         init_waitqueue_head(&bo->event_queue);
1221         INIT_LIST_HEAD(&bo->lru);
1222         INIT_LIST_HEAD(&bo->ddestroy);
1223         INIT_LIST_HEAD(&bo->swap);
1224         INIT_LIST_HEAD(&bo->io_reserve_lru);
1225         bo->bdev = bdev;
1226         bo->glob = bdev->glob;
1227         bo->type = type;
1228         bo->num_pages = num_pages;
1229         bo->mem.size = num_pages << PAGE_SHIFT;
1230         bo->mem.mem_type = TTM_PL_SYSTEM;
1231         bo->mem.num_pages = bo->num_pages;
1232         bo->mem.mm_node = NULL;
1233         bo->mem.page_alignment = page_alignment;
1234         bo->mem.bus.io_reserved_vm = false;
1235         bo->mem.bus.io_reserved_count = 0;
1236         bo->buffer_start = buffer_start & PAGE_MASK;
1237         bo->priv_flags = 0;
1238         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1239         bo->seq_valid = false;
1240         bo->persistent_swap_storage = persistent_swap_storage;
1241         bo->acc_size = acc_size;
1242         bo->sg = sg;
1243         atomic_inc(&bo->glob->bo_count);
1244
1245         ret = ttm_bo_check_placement(bo, placement);
1246         if (unlikely(ret != 0))
1247                 goto out_err;
1248
1249         /*
1250          * For ttm_bo_type_device buffers, allocate
1251          * address space from the device.
1252          */
1253         if (bo->type == ttm_bo_type_device ||
1254             bo->type == ttm_bo_type_sg) {
1255                 ret = ttm_bo_setup_vm(bo);
1256                 if (ret)
1257                         goto out_err;
1258         }
1259
1260         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1261         if (ret)
1262                 goto out_err;
1263
1264         ttm_bo_unreserve(bo);
1265         return 0;
1266
1267 out_err:
1268         ttm_bo_unreserve(bo);
1269         ttm_bo_unref(&bo);
1270
1271         return ret;
1272 }
1273 EXPORT_SYMBOL(ttm_bo_init);
1274
1275 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1276                        unsigned long bo_size,
1277                        unsigned struct_size)
1278 {
1279         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1280         size_t size = 0;
1281
1282         size += ttm_round_pot(struct_size);
1283         size += PAGE_ALIGN(npages * sizeof(void *));
1284         size += ttm_round_pot(sizeof(struct ttm_tt));
1285         return size;
1286 }
1287 EXPORT_SYMBOL(ttm_bo_acc_size);
1288
1289 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1290                            unsigned long bo_size,
1291                            unsigned struct_size)
1292 {
1293         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1294         size_t size = 0;
1295
1296         size += ttm_round_pot(struct_size);
1297         size += PAGE_ALIGN(npages * sizeof(void *));
1298         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1299         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1300         return size;
1301 }
1302 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1303
1304 int ttm_bo_create(struct ttm_bo_device *bdev,
1305                         unsigned long size,
1306                         enum ttm_bo_type type,
1307                         struct ttm_placement *placement,
1308                         uint32_t page_alignment,
1309                         unsigned long buffer_start,
1310                         bool interruptible,
1311                         struct file *persistent_swap_storage,
1312                         struct ttm_buffer_object **p_bo)
1313 {
1314         struct ttm_buffer_object *bo;
1315         size_t acc_size;
1316         int ret;
1317
1318         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1319         if (unlikely(bo == NULL))
1320                 return -ENOMEM;
1321
1322         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1323         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1324                                 buffer_start, interruptible,
1325                           persistent_swap_storage, acc_size, NULL, NULL);
1326         if (likely(ret == 0))
1327                 *p_bo = bo;
1328
1329         return ret;
1330 }
1331 EXPORT_SYMBOL(ttm_bo_create);
1332
1333 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1334                                         unsigned mem_type, bool allow_errors)
1335 {
1336         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1337         struct ttm_bo_global *glob = bdev->glob;
1338         int ret;
1339
1340         /*
1341          * Can't use standard list traversal since we're unlocking.
1342          */
1343
1344         spin_lock(&glob->lru_lock);
1345         while (!list_empty(&man->lru)) {
1346                 spin_unlock(&glob->lru_lock);
1347                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1348                 if (ret) {
1349                         if (allow_errors) {
1350                                 return ret;
1351                         } else {
1352                                 pr_err("Cleanup eviction failed\n");
1353                         }
1354                 }
1355                 spin_lock(&glob->lru_lock);
1356         }
1357         spin_unlock(&glob->lru_lock);
1358         return 0;
1359 }
1360
1361 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1362 {
1363         struct ttm_mem_type_manager *man;
1364         int ret = -EINVAL;
1365
1366         if (mem_type >= TTM_NUM_MEM_TYPES) {
1367                 pr_err("Illegal memory type %d\n", mem_type);
1368                 return ret;
1369         }
1370         man = &bdev->man[mem_type];
1371
1372         if (!man->has_type) {
1373                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1374                        mem_type);
1375                 return ret;
1376         }
1377
1378         man->use_type = false;
1379         man->has_type = false;
1380
1381         ret = 0;
1382         if (mem_type > 0) {
1383                 ttm_bo_force_list_clean(bdev, mem_type, false);
1384
1385                 ret = (*man->func->takedown)(man);
1386         }
1387
1388         return ret;
1389 }
1390 EXPORT_SYMBOL(ttm_bo_clean_mm);
1391
1392 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1393 {
1394         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1395
1396         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1397                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1398                 return -EINVAL;
1399         }
1400
1401         if (!man->has_type) {
1402                 pr_err("Memory type %u has not been initialized\n", mem_type);
1403                 return 0;
1404         }
1405
1406         return ttm_bo_force_list_clean(bdev, mem_type, true);
1407 }
1408 EXPORT_SYMBOL(ttm_bo_evict_mm);
1409
1410 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1411                         unsigned long p_size)
1412 {
1413         int ret = -EINVAL;
1414         struct ttm_mem_type_manager *man;
1415
1416         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1417         man = &bdev->man[type];
1418         BUG_ON(man->has_type);
1419         man->io_reserve_fastpath = true;
1420         man->use_io_reserve_lru = false;
1421         mutex_init(&man->io_reserve_mutex);
1422         INIT_LIST_HEAD(&man->io_reserve_lru);
1423
1424         ret = bdev->driver->init_mem_type(bdev, type, man);
1425         if (ret)
1426                 return ret;
1427         man->bdev = bdev;
1428
1429         ret = 0;
1430         if (type != TTM_PL_SYSTEM) {
1431                 ret = (*man->func->init)(man, p_size);
1432                 if (ret)
1433                         return ret;
1434         }
1435         man->has_type = true;
1436         man->use_type = true;
1437         man->size = p_size;
1438
1439         INIT_LIST_HEAD(&man->lru);
1440
1441         return 0;
1442 }
1443 EXPORT_SYMBOL(ttm_bo_init_mm);
1444
1445 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1446 {
1447         struct ttm_bo_global *glob =
1448                 container_of(kobj, struct ttm_bo_global, kobj);
1449
1450         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1451         __free_page(glob->dummy_read_page);
1452         kfree(glob);
1453 }
1454
1455 void ttm_bo_global_release(struct drm_global_reference *ref)
1456 {
1457         struct ttm_bo_global *glob = ref->object;
1458
1459         kobject_del(&glob->kobj);
1460         kobject_put(&glob->kobj);
1461 }
1462 EXPORT_SYMBOL(ttm_bo_global_release);
1463
1464 int ttm_bo_global_init(struct drm_global_reference *ref)
1465 {
1466         struct ttm_bo_global_ref *bo_ref =
1467                 container_of(ref, struct ttm_bo_global_ref, ref);
1468         struct ttm_bo_global *glob = ref->object;
1469         int ret;
1470
1471         mutex_init(&glob->device_list_mutex);
1472         spin_lock_init(&glob->lru_lock);
1473         glob->mem_glob = bo_ref->mem_glob;
1474         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1475
1476         if (unlikely(glob->dummy_read_page == NULL)) {
1477                 ret = -ENOMEM;
1478                 goto out_no_drp;
1479         }
1480
1481         INIT_LIST_HEAD(&glob->swap_lru);
1482         INIT_LIST_HEAD(&glob->device_list);
1483
1484         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1485         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1486         if (unlikely(ret != 0)) {
1487                 pr_err("Could not register buffer object swapout\n");
1488                 goto out_no_shrink;
1489         }
1490
1491         atomic_set(&glob->bo_count, 0);
1492
1493         ret = kobject_init_and_add(
1494                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1495         if (unlikely(ret != 0))
1496                 kobject_put(&glob->kobj);
1497         return ret;
1498 out_no_shrink:
1499         __free_page(glob->dummy_read_page);
1500 out_no_drp:
1501         kfree(glob);
1502         return ret;
1503 }
1504 EXPORT_SYMBOL(ttm_bo_global_init);
1505
1506
1507 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1508 {
1509         int ret = 0;
1510         unsigned i = TTM_NUM_MEM_TYPES;
1511         struct ttm_mem_type_manager *man;
1512         struct ttm_bo_global *glob = bdev->glob;
1513
1514         while (i--) {
1515                 man = &bdev->man[i];
1516                 if (man->has_type) {
1517                         man->use_type = false;
1518                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1519                                 ret = -EBUSY;
1520                                 pr_err("DRM memory manager type %d is not clean\n",
1521                                        i);
1522                         }
1523                         man->has_type = false;
1524                 }
1525         }
1526
1527         mutex_lock(&glob->device_list_mutex);
1528         list_del(&bdev->device_list);
1529         mutex_unlock(&glob->device_list_mutex);
1530
1531         cancel_delayed_work_sync(&bdev->wq);
1532
1533         while (ttm_bo_delayed_delete(bdev, true))
1534                 ;
1535
1536         spin_lock(&glob->lru_lock);
1537         if (list_empty(&bdev->ddestroy))
1538                 TTM_DEBUG("Delayed destroy list was clean\n");
1539
1540         if (list_empty(&bdev->man[0].lru))
1541                 TTM_DEBUG("Swap list was clean\n");
1542         spin_unlock(&glob->lru_lock);
1543
1544         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1545         write_lock(&bdev->vm_lock);
1546         drm_mm_takedown(&bdev->addr_space_mm);
1547         write_unlock(&bdev->vm_lock);
1548
1549         return ret;
1550 }
1551 EXPORT_SYMBOL(ttm_bo_device_release);
1552
1553 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1554                        struct ttm_bo_global *glob,
1555                        struct ttm_bo_driver *driver,
1556                        uint64_t file_page_offset,
1557                        bool need_dma32)
1558 {
1559         int ret = -EINVAL;
1560
1561         rwlock_init(&bdev->vm_lock);
1562         bdev->driver = driver;
1563
1564         memset(bdev->man, 0, sizeof(bdev->man));
1565
1566         /*
1567          * Initialize the system memory buffer type.
1568          * Other types need to be driver / IOCTL initialized.
1569          */
1570         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1571         if (unlikely(ret != 0))
1572                 goto out_no_sys;
1573
1574         bdev->addr_space_rb = RB_ROOT;
1575         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1576         if (unlikely(ret != 0))
1577                 goto out_no_addr_mm;
1578
1579         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1580         bdev->nice_mode = true;
1581         INIT_LIST_HEAD(&bdev->ddestroy);
1582         bdev->dev_mapping = NULL;
1583         bdev->glob = glob;
1584         bdev->need_dma32 = need_dma32;
1585         bdev->val_seq = 0;
1586         spin_lock_init(&bdev->fence_lock);
1587         mutex_lock(&glob->device_list_mutex);
1588         list_add_tail(&bdev->device_list, &glob->device_list);
1589         mutex_unlock(&glob->device_list_mutex);
1590
1591         return 0;
1592 out_no_addr_mm:
1593         ttm_bo_clean_mm(bdev, 0);
1594 out_no_sys:
1595         return ret;
1596 }
1597 EXPORT_SYMBOL(ttm_bo_device_init);
1598
1599 /*
1600  * buffer object vm functions.
1601  */
1602
1603 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1604 {
1605         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1606
1607         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1608                 if (mem->mem_type == TTM_PL_SYSTEM)
1609                         return false;
1610
1611                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1612                         return false;
1613
1614                 if (mem->placement & TTM_PL_FLAG_CACHED)
1615                         return false;
1616         }
1617         return true;
1618 }
1619
1620 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1621 {
1622         struct ttm_bo_device *bdev = bo->bdev;
1623         loff_t offset = (loff_t) bo->addr_space_offset;
1624         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1625
1626         if (!bdev->dev_mapping)
1627                 return;
1628         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1629         ttm_mem_io_free_vm(bo);
1630 }
1631
1632 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1633 {
1634         struct ttm_bo_device *bdev = bo->bdev;
1635         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1636
1637         ttm_mem_io_lock(man, false);
1638         ttm_bo_unmap_virtual_locked(bo);
1639         ttm_mem_io_unlock(man);
1640 }
1641
1642
1643 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1644
1645 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1646 {
1647         struct ttm_bo_device *bdev = bo->bdev;
1648         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1649         struct rb_node *parent = NULL;
1650         struct ttm_buffer_object *cur_bo;
1651         unsigned long offset = bo->vm_node->start;
1652         unsigned long cur_offset;
1653
1654         while (*cur) {
1655                 parent = *cur;
1656                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1657                 cur_offset = cur_bo->vm_node->start;
1658                 if (offset < cur_offset)
1659                         cur = &parent->rb_left;
1660                 else if (offset > cur_offset)
1661                         cur = &parent->rb_right;
1662                 else
1663                         BUG();
1664         }
1665
1666         rb_link_node(&bo->vm_rb, parent, cur);
1667         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1668 }
1669
1670 /**
1671  * ttm_bo_setup_vm:
1672  *
1673  * @bo: the buffer to allocate address space for
1674  *
1675  * Allocate address space in the drm device so that applications
1676  * can mmap the buffer and access the contents. This only
1677  * applies to ttm_bo_type_device objects as others are not
1678  * placed in the drm device address space.
1679  */
1680
1681 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1682 {
1683         struct ttm_bo_device *bdev = bo->bdev;
1684         int ret;
1685
1686 retry_pre_get:
1687         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1688         if (unlikely(ret != 0))
1689                 return ret;
1690
1691         write_lock(&bdev->vm_lock);
1692         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1693                                          bo->mem.num_pages, 0, 0);
1694
1695         if (unlikely(bo->vm_node == NULL)) {
1696                 ret = -ENOMEM;
1697                 goto out_unlock;
1698         }
1699
1700         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1701                                               bo->mem.num_pages, 0);
1702
1703         if (unlikely(bo->vm_node == NULL)) {
1704                 write_unlock(&bdev->vm_lock);
1705                 goto retry_pre_get;
1706         }
1707
1708         ttm_bo_vm_insert_rb(bo);
1709         write_unlock(&bdev->vm_lock);
1710         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1711
1712         return 0;
1713 out_unlock:
1714         write_unlock(&bdev->vm_lock);
1715         return ret;
1716 }
1717
1718 int ttm_bo_wait(struct ttm_buffer_object *bo,
1719                 bool lazy, bool interruptible, bool no_wait)
1720 {
1721         struct ttm_bo_driver *driver = bo->bdev->driver;
1722         struct ttm_bo_device *bdev = bo->bdev;
1723         void *sync_obj;
1724         void *sync_obj_arg;
1725         int ret = 0;
1726
1727         if (likely(bo->sync_obj == NULL))
1728                 return 0;
1729
1730         while (bo->sync_obj) {
1731
1732                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1733                         void *tmp_obj = bo->sync_obj;
1734                         bo->sync_obj = NULL;
1735                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1736                         spin_unlock(&bdev->fence_lock);
1737                         driver->sync_obj_unref(&tmp_obj);
1738                         spin_lock(&bdev->fence_lock);
1739                         continue;
1740                 }
1741
1742                 if (no_wait)
1743                         return -EBUSY;
1744
1745                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1746                 sync_obj_arg = bo->sync_obj_arg;
1747                 spin_unlock(&bdev->fence_lock);
1748                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1749                                             lazy, interruptible);
1750                 if (unlikely(ret != 0)) {
1751                         driver->sync_obj_unref(&sync_obj);
1752                         spin_lock(&bdev->fence_lock);
1753                         return ret;
1754                 }
1755                 spin_lock(&bdev->fence_lock);
1756                 if (likely(bo->sync_obj == sync_obj &&
1757                            bo->sync_obj_arg == sync_obj_arg)) {
1758                         void *tmp_obj = bo->sync_obj;
1759                         bo->sync_obj = NULL;
1760                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1761                                   &bo->priv_flags);
1762                         spin_unlock(&bdev->fence_lock);
1763                         driver->sync_obj_unref(&sync_obj);
1764                         driver->sync_obj_unref(&tmp_obj);
1765                         spin_lock(&bdev->fence_lock);
1766                 } else {
1767                         spin_unlock(&bdev->fence_lock);
1768                         driver->sync_obj_unref(&sync_obj);
1769                         spin_lock(&bdev->fence_lock);
1770                 }
1771         }
1772         return 0;
1773 }
1774 EXPORT_SYMBOL(ttm_bo_wait);
1775
1776 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1777 {
1778         struct ttm_bo_device *bdev = bo->bdev;
1779         int ret = 0;
1780
1781         /*
1782          * Using ttm_bo_reserve makes sure the lru lists are updated.
1783          */
1784
1785         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1786         if (unlikely(ret != 0))
1787                 return ret;
1788         spin_lock(&bdev->fence_lock);
1789         ret = ttm_bo_wait(bo, false, true, no_wait);
1790         spin_unlock(&bdev->fence_lock);
1791         if (likely(ret == 0))
1792                 atomic_inc(&bo->cpu_writers);
1793         ttm_bo_unreserve(bo);
1794         return ret;
1795 }
1796 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1797
1798 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1799 {
1800         if (atomic_dec_and_test(&bo->cpu_writers))
1801                 wake_up_all(&bo->event_queue);
1802 }
1803 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1804
1805 /**
1806  * A buffer object shrink method that tries to swap out the first
1807  * buffer object on the bo_global::swap_lru list.
1808  */
1809
1810 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1811 {
1812         struct ttm_bo_global *glob =
1813             container_of(shrink, struct ttm_bo_global, shrink);
1814         struct ttm_buffer_object *bo;
1815         int ret = -EBUSY;
1816         int put_count;
1817         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1818
1819         spin_lock(&glob->lru_lock);
1820         while (ret == -EBUSY) {
1821                 if (unlikely(list_empty(&glob->swap_lru))) {
1822                         spin_unlock(&glob->lru_lock);
1823                         return -EBUSY;
1824                 }
1825
1826                 bo = list_first_entry(&glob->swap_lru,
1827                                       struct ttm_buffer_object, swap);
1828                 kref_get(&bo->list_kref);
1829
1830                 if (!list_empty(&bo->ddestroy)) {
1831                         spin_unlock(&glob->lru_lock);
1832                         (void) ttm_bo_cleanup_refs(bo, false, false, false);
1833                         kref_put(&bo->list_kref, ttm_bo_release_list);
1834                         spin_lock(&glob->lru_lock);
1835                         continue;
1836                 }
1837
1838                 /**
1839                  * Reserve buffer. Since we unlock while sleeping, we need
1840                  * to re-check that nobody removed us from the swap-list while
1841                  * we slept.
1842                  */
1843
1844                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1845                 if (unlikely(ret == -EBUSY)) {
1846                         spin_unlock(&glob->lru_lock);
1847                         ttm_bo_wait_unreserved(bo, false);
1848                         kref_put(&bo->list_kref, ttm_bo_release_list);
1849                         spin_lock(&glob->lru_lock);
1850                 }
1851         }
1852
1853         BUG_ON(ret != 0);
1854         put_count = ttm_bo_del_from_lru(bo);
1855         spin_unlock(&glob->lru_lock);
1856
1857         ttm_bo_list_ref_sub(bo, put_count, true);
1858
1859         /**
1860          * Wait for GPU, then move to system cached.
1861          */
1862
1863         spin_lock(&bo->bdev->fence_lock);
1864         ret = ttm_bo_wait(bo, false, false, false);
1865         spin_unlock(&bo->bdev->fence_lock);
1866
1867         if (unlikely(ret != 0))
1868                 goto out;
1869
1870         if ((bo->mem.placement & swap_placement) != swap_placement) {
1871                 struct ttm_mem_reg evict_mem;
1872
1873                 evict_mem = bo->mem;
1874                 evict_mem.mm_node = NULL;
1875                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1876                 evict_mem.mem_type = TTM_PL_SYSTEM;
1877
1878                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1879                                              false, false, false);
1880                 if (unlikely(ret != 0))
1881                         goto out;
1882         }
1883
1884         ttm_bo_unmap_virtual(bo);
1885
1886         /**
1887          * Swap out. Buffer will be swapped in again as soon as
1888          * anyone tries to access a ttm page.
1889          */
1890
1891         if (bo->bdev->driver->swap_notify)
1892                 bo->bdev->driver->swap_notify(bo);
1893
1894         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1895 out:
1896
1897         /**
1898          *
1899          * Unreserve without putting on LRU to avoid swapping out an
1900          * already swapped buffer.
1901          */
1902
1903         atomic_set(&bo->reserved, 0);
1904         wake_up_all(&bo->event_queue);
1905         kref_put(&bo->list_kref, ttm_bo_release_list);
1906         return ret;
1907 }
1908
1909 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1910 {
1911         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1912                 ;
1913 }
1914 EXPORT_SYMBOL(ttm_bo_swapout_all);