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