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