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