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, TTM_USAGE_READWRITE);
 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                           TTM_USAGE_READWRITE);
 571         spin_unlock(&bdev->fence_lock);
 572
 573         if (unlikely(ret != 0))
 574                 return ret;
 575
 576         spin_lock(&glob->lru_lock);
 577         ret = ttm_bo_reserve_locked(bo, interruptible,
 578                                     no_wait_reserve, false, 0);
 579
 580         if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
 581                 spin_unlock(&glob->lru_lock);
 582                 return ret;
 583         }
 584
 585         /**
 586          * We can re-check for sync object without taking
 587          * the bo::lock since setting the sync object requires
 588          * also bo::reserved. A busy object at this point may
 589          * be caused by another thread recently starting an accelerated
 590          * eviction.
 591          */
 592
 593         if (unlikely(bo->sync_obj)) {
 594                 atomic_set(&bo->reserved, 0);
 595                 wake_up_all(&bo->event_queue);
 596                 spin_unlock(&glob->lru_lock);
 597                 goto retry;
 598         }
 599
 600         put_count = ttm_bo_del_from_lru(bo);
 601         list_del_init(&bo->ddestroy);
 602         ++put_count;
 603
 604         spin_unlock(&glob->lru_lock);
 605         ttm_bo_cleanup_memtype_use(bo);
 606
 607         ttm_bo_list_ref_sub(bo, put_count, true);
 608
 609         return 0;
 610 }
 611
 612 /**
 613  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 614  * encountered buffers.
 615  */
 616
 617 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 618 {
 619         struct ttm_bo_global *glob = bdev->glob;
 620         struct ttm_buffer_object *entry = NULL;
 621         int ret = 0;
 622
 623         spin_lock(&glob->lru_lock);
 624         if (list_empty(&bdev->ddestroy))
 625                 goto out_unlock;
 626
 627         entry = list_first_entry(&bdev->ddestroy,
 628                 struct ttm_buffer_object, ddestroy);
 629         kref_get(&entry->list_kref);
 630
 631         for (;;) {
 632                 struct ttm_buffer_object *nentry = NULL;
 633
 634                 if (entry->ddestroy.next != &bdev->ddestroy) {
 635                         nentry = list_first_entry(&entry->ddestroy,
 636                                 struct ttm_buffer_object, ddestroy);
 637                         kref_get(&nentry->list_kref);
 638                 }
 639
 640                 spin_unlock(&glob->lru_lock);
 641                 ret = ttm_bo_cleanup_refs(entry, false, !remove_all,
 642                                           !remove_all);
 643                 kref_put(&entry->list_kref, ttm_bo_release_list);
 644                 entry = nentry;
 645
 646                 if (ret || !entry)
 647                         goto out;
 648
 649                 spin_lock(&glob->lru_lock);
 650                 if (list_empty(&entry->ddestroy))
 651                         break;
 652         }
 653
 654 out_unlock:
 655         spin_unlock(&glob->lru_lock);
 656 out:
 657         if (entry)
 658                 kref_put(&entry->list_kref, ttm_bo_release_list);
 659         return ret;
 660 }
 661
 662 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 663 {
 664         struct ttm_bo_device *bdev =
 665             container_of(work, struct ttm_bo_device, wq.work);
 666
 667         if (ttm_bo_delayed_delete(bdev, false)) {
 668                 schedule_delayed_work(&bdev->wq,
 669                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 670         }
 671 }
 672
 673 static void ttm_bo_release(struct kref *kref)
 674 {
 675         struct ttm_buffer_object *bo =
 676             container_of(kref, struct ttm_buffer_object, kref);
 677         struct ttm_bo_device *bdev = bo->bdev;
 678         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 679
 680         if (likely(bo->vm_node != NULL)) {
 681                 rb_erase(&bo->vm_rb, &bdev->addr_space_rb);
 682                 drm_mm_put_block(bo->vm_node);
 683                 bo->vm_node = NULL;
 684         }
 685         write_unlock(&bdev->vm_lock);
 686         ttm_mem_io_lock(man, false);
 687         ttm_mem_io_free_vm(bo);
 688         ttm_mem_io_unlock(man);
 689         ttm_bo_cleanup_refs_or_queue(bo);
 690         kref_put(&bo->list_kref, ttm_bo_release_list);
 691         write_lock(&bdev->vm_lock);
 692 }
 693
 694 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 695 {
 696         struct ttm_buffer_object *bo = *p_bo;
 697         struct ttm_bo_device *bdev = bo->bdev;
 698
 699         *p_bo = NULL;
 700         write_lock(&bdev->vm_lock);
 701         kref_put(&bo->kref, ttm_bo_release);
 702         write_unlock(&bdev->vm_lock);
 703 }
 704 EXPORT_SYMBOL(ttm_bo_unref);
 705
 706 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 707 {
 708         return cancel_delayed_work_sync(&bdev->wq);
 709 }
 710 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 711
 712 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 713 {
 714         if (resched)
 715                 schedule_delayed_work(&bdev->wq,
 716                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 717 }
 718 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 719
 720 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 721                         bool no_wait_reserve, bool no_wait_gpu)
 722 {
 723         struct ttm_bo_device *bdev = bo->bdev;
 724         struct ttm_mem_reg evict_mem;
 725         struct ttm_placement placement;
 726         int ret = 0;
 727
 728         spin_lock(&bdev->fence_lock);
 729         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu,
 730                           TTM_USAGE_READWRITE);
 731         spin_unlock(&bdev->fence_lock);
 732
 733         if (unlikely(ret != 0)) {
 734                 if (ret != -ERESTARTSYS) {
 735                         printk(KERN_ERR TTM_PFX
 736                                "Failed to expire sync object before "
 737                                "buffer eviction.\n");
 738                 }
 739                 goto out;
 740         }
 741
 742         BUG_ON(!atomic_read(&bo->reserved));
 743
 744         evict_mem = bo->mem;
 745         evict_mem.mm_node = NULL;
 746         evict_mem.bus.io_reserved_vm = false;
 747         evict_mem.bus.io_reserved_count = 0;
 748
 749         placement.fpfn = 0;
 750         placement.lpfn = 0;
 751         placement.num_placement = 0;
 752         placement.num_busy_placement = 0;
 753         bdev->driver->evict_flags(bo, &placement);
 754         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 755                                 no_wait_reserve, no_wait_gpu);
 756         if (ret) {
 757                 if (ret != -ERESTARTSYS) {
 758                         printk(KERN_ERR TTM_PFX
 759                                "Failed to find memory space for "
 760                                "buffer 0x%p eviction.\n", bo);
 761                         ttm_bo_mem_space_debug(bo, &placement);
 762                 }
 763                 goto out;
 764         }
 765
 766         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 767                                      no_wait_reserve, no_wait_gpu);
 768         if (ret) {
 769                 if (ret != -ERESTARTSYS)
 770                         printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
 771                 ttm_bo_mem_put(bo, &evict_mem);
 772                 goto out;
 773         }
 774         bo->evicted = true;
 775 out:
 776         return ret;
 777 }
 778
 779 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 780                                 uint32_t mem_type,
 781                                 bool interruptible, bool no_wait_reserve,
 782                                 bool no_wait_gpu)
 783 {
 784         struct ttm_bo_global *glob = bdev->glob;
 785         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 786         struct ttm_buffer_object *bo;
 787         int ret, put_count = 0;
 788
 789 retry:
 790         spin_lock(&glob->lru_lock);
 791         if (list_empty(&man->lru)) {
 792                 spin_unlock(&glob->lru_lock);
 793                 return -EBUSY;
 794         }
 795
 796         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 797         kref_get(&bo->list_kref);
 798
 799         if (!list_empty(&bo->ddestroy)) {
 800                 spin_unlock(&glob->lru_lock);
 801                 ret = ttm_bo_cleanup_refs(bo, interruptible,
 802                                           no_wait_reserve, no_wait_gpu);
 803                 kref_put(&bo->list_kref, ttm_bo_release_list);
 804
 805                 if (likely(ret == 0 || ret == -ERESTARTSYS))
 806                         return ret;
 807
 808                 goto retry;
 809         }
 810
 811         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 812
 813         if (unlikely(ret == -EBUSY)) {
 814                 spin_unlock(&glob->lru_lock);
 815                 if (likely(!no_wait_gpu))
 816                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 817
 818                 kref_put(&bo->list_kref, ttm_bo_release_list);
 819
 820                 /**
 821                  * We *need* to retry after releasing the lru lock.
 822                  */
 823
 824                 if (unlikely(ret != 0))
 825                         return ret;
 826                 goto retry;
 827         }
 828
 829         put_count = ttm_bo_del_from_lru(bo);
 830         spin_unlock(&glob->lru_lock);
 831
 832         BUG_ON(ret != 0);
 833
 834         ttm_bo_list_ref_sub(bo, put_count, true);
 835
 836         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 837         ttm_bo_unreserve(bo);
 838
 839         kref_put(&bo->list_kref, ttm_bo_release_list);
 840         return ret;
 841 }
 842
 843 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 844 {
 845         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 846
 847         if (mem->mm_node)
 848                 (*man->func->put_node)(man, mem);
 849 }
 850 EXPORT_SYMBOL(ttm_bo_mem_put);
 851
 852 /**
 853  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 854  * space, or we've evicted everything and there isn't enough space.
 855  */
 856 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 857                                         uint32_t mem_type,
 858                                         struct ttm_placement *placement,
 859                                         struct ttm_mem_reg *mem,
 860                                         bool interruptible,
 861                                         bool no_wait_reserve,
 862                                         bool no_wait_gpu)
 863 {
 864         struct ttm_bo_device *bdev = bo->bdev;
 865         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 866         int ret;
 867
 868         do {
 869                 ret = (*man->func->get_node)(man, bo, placement, mem);
 870                 if (unlikely(ret != 0))
 871                         return ret;
 872                 if (mem->mm_node)
 873                         break;
 874                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 875                                                 no_wait_reserve, no_wait_gpu);
 876                 if (unlikely(ret != 0))
 877                         return ret;
 878         } while (1);
 879         if (mem->mm_node == NULL)
 880                 return -ENOMEM;
 881         mem->mem_type = mem_type;
 882         return 0;
 883 }
 884
 885 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 886                                       uint32_t cur_placement,
 887                                       uint32_t proposed_placement)
 888 {
 889         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 890         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 891
 892         /**
 893          * Keep current caching if possible.
 894          */
 895
 896         if ((cur_placement & caching) != 0)
 897                 result |= (cur_placement & caching);
 898         else if ((man->default_caching & caching) != 0)
 899                 result |= man->default_caching;
 900         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 901                 result |= TTM_PL_FLAG_CACHED;
 902         else if ((TTM_PL_FLAG_WC & caching) != 0)
 903                 result |= TTM_PL_FLAG_WC;
 904         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 905                 result |= TTM_PL_FLAG_UNCACHED;
 906
 907         return result;
 908 }
 909
 910 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 911                                  bool disallow_fixed,
 912                                  uint32_t mem_type,
 913                                  uint32_t proposed_placement,
 914                                  uint32_t *masked_placement)
 915 {
 916         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 917
 918         if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed)
 919                 return false;
 920
 921         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 922                 return false;
 923
 924         if ((proposed_placement & man->available_caching) == 0)
 925                 return false;
 926
 927         cur_flags |= (proposed_placement & man->available_caching);
 928
 929         *masked_placement = cur_flags;
 930         return true;
 931 }
 932
 933 /**
 934  * Creates space for memory region @mem according to its type.
 935  *
 936  * This function first searches for free space in compatible memory types in
 937  * the priority order defined by the driver.  If free space isn't found, then
 938  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 939  * space.
 940  */
 941 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 942                         struct ttm_placement *placement,
 943                         struct ttm_mem_reg *mem,
 944                         bool interruptible, bool no_wait_reserve,
 945                         bool no_wait_gpu)
 946 {
 947         struct ttm_bo_device *bdev = bo->bdev;
 948         struct ttm_mem_type_manager *man;
 949         uint32_t mem_type = TTM_PL_SYSTEM;
 950         uint32_t cur_flags = 0;
 951         bool type_found = false;
 952         bool type_ok = false;
 953         bool has_erestartsys = false;
 954         int i, ret;
 955
 956         mem->mm_node = NULL;
 957         for (i = 0; i < placement->num_placement; ++i) {
 958                 ret = ttm_mem_type_from_flags(placement->placement[i],
 959                                                 &mem_type);
 960                 if (ret)
 961                         return ret;
 962                 man = &bdev->man[mem_type];
 963
 964                 type_ok = ttm_bo_mt_compatible(man,
 965                                                 bo->type == ttm_bo_type_user,
 966                                                 mem_type,
 967                                                 placement->placement[i],
 968                                                 &cur_flags);
 969
 970                 if (!type_ok)
 971                         continue;
 972
 973                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 974                                                   cur_flags);
 975                 /*
 976                  * Use the access and other non-mapping-related flag bits from
 977                  * the memory placement flags to the current flags
 978                  */
 979                 ttm_flag_masked(&cur_flags, placement->placement[i],
 980                                 ~TTM_PL_MASK_MEMTYPE);
 981
 982                 if (mem_type == TTM_PL_SYSTEM)
 983                         break;
 984
 985                 if (man->has_type && man->use_type) {
 986                         type_found = true;
 987                         ret = (*man->func->get_node)(man, bo, placement, mem);
 988                         if (unlikely(ret))
 989                                 return ret;
 990                 }
 991                 if (mem->mm_node)
 992                         break;
 993         }
 994
 995         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 996                 mem->mem_type = mem_type;
 997                 mem->placement = cur_flags;
 998                 return 0;
 999         }
1000
1001         if (!type_found)
1002                 return -EINVAL;
1003
1004         for (i = 0; i < placement->num_busy_placement; ++i) {
1005                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1006                                                 &mem_type);
1007                 if (ret)
1008                         return ret;
1009                 man = &bdev->man[mem_type];
1010                 if (!man->has_type)
1011                         continue;
1012                 if (!ttm_bo_mt_compatible(man,
1013                                                 bo->type == ttm_bo_type_user,
1014                                                 mem_type,
1015                                                 placement->busy_placement[i],
1016                                                 &cur_flags))
1017                         continue;
1018
1019                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1020                                                   cur_flags);
1021                 /*
1022                  * Use the access and other non-mapping-related flag bits from
1023                  * the memory placement flags to the current flags
1024                  */
1025                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1026                                 ~TTM_PL_MASK_MEMTYPE);
1027
1028
1029                 if (mem_type == TTM_PL_SYSTEM) {
1030                         mem->mem_type = mem_type;
1031                         mem->placement = cur_flags;
1032                         mem->mm_node = NULL;
1033                         return 0;
1034                 }
1035
1036                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1037                                                 interruptible, no_wait_reserve, no_wait_gpu);
1038                 if (ret == 0 && mem->mm_node) {
1039                         mem->placement = cur_flags;
1040                         return 0;
1041                 }
1042                 if (ret == -ERESTARTSYS)
1043                         has_erestartsys = true;
1044         }
1045         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1046         return ret;
1047 }
1048 EXPORT_SYMBOL(ttm_bo_mem_space);
1049
1050 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1051 {
1052         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1053                 return -EBUSY;
1054
1055         return wait_event_interruptible(bo->event_queue,
1056                                         atomic_read(&bo->cpu_writers) == 0);
1057 }
1058 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1059
1060 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1061                         struct ttm_placement *placement,
1062                         bool interruptible, bool no_wait_reserve,
1063                         bool no_wait_gpu)
1064 {
1065         int ret = 0;
1066         struct ttm_mem_reg mem;
1067         struct ttm_bo_device *bdev = bo->bdev;
1068
1069         BUG_ON(!atomic_read(&bo->reserved));
1070
1071         /*
1072          * FIXME: It's possible to pipeline buffer moves.
1073          * Have the driver move function wait for idle when necessary,
1074          * instead of doing it here.
1075          */
1076         spin_lock(&bdev->fence_lock);
1077         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu,
1078                           TTM_USAGE_READWRITE);
1079         spin_unlock(&bdev->fence_lock);
1080         if (ret)
1081                 return ret;
1082         mem.num_pages = bo->num_pages;
1083         mem.size = mem.num_pages << PAGE_SHIFT;
1084         mem.page_alignment = bo->mem.page_alignment;
1085         mem.bus.io_reserved_vm = false;
1086         mem.bus.io_reserved_count = 0;
1087         /*
1088          * Determine where to move the buffer.
1089          */
1090         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1091         if (ret)
1092                 goto out_unlock;
1093         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1094 out_unlock:
1095         if (ret && mem.mm_node)
1096                 ttm_bo_mem_put(bo, &mem);
1097         return ret;
1098 }
1099
1100 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1101                              struct ttm_mem_reg *mem)
1102 {
1103         int i;
1104
1105         if (mem->mm_node && placement->lpfn != 0 &&
1106             (mem->start < placement->fpfn ||
1107              mem->start + mem->num_pages > placement->lpfn))
1108                 return -1;
1109
1110         for (i = 0; i < placement->num_placement; i++) {
1111                 if ((placement->placement[i] & mem->placement &
1112                         TTM_PL_MASK_CACHING) &&
1113                         (placement->placement[i] & mem->placement &
1114                         TTM_PL_MASK_MEM))
1115                         return i;
1116         }
1117         return -1;
1118 }
1119
1120 int ttm_bo_validate(struct ttm_buffer_object *bo,
1121                         struct ttm_placement *placement,
1122                         bool interruptible, bool no_wait_reserve,
1123                         bool no_wait_gpu)
1124 {
1125         int ret;
1126
1127         BUG_ON(!atomic_read(&bo->reserved));
1128         /* Check that range is valid */
1129         if (placement->lpfn || placement->fpfn)
1130                 if (placement->fpfn > placement->lpfn ||
1131                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1132                         return -EINVAL;
1133         /*
1134          * Check whether we need to move buffer.
1135          */
1136         ret = ttm_bo_mem_compat(placement, &bo->mem);
1137         if (ret < 0) {
1138                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1139                 if (ret)
1140                         return ret;
1141         } else {
1142                 /*
1143                  * Use the access and other non-mapping-related flag bits from
1144                  * the compatible memory placement flags to the active flags
1145                  */
1146                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1147                                 ~TTM_PL_MASK_MEMTYPE);
1148         }
1149         /*
1150          * We might need to add a TTM.
1151          */
1152         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1153                 ret = ttm_bo_add_ttm(bo, true);
1154                 if (ret)
1155                         return ret;
1156         }
1157         return 0;
1158 }
1159 EXPORT_SYMBOL(ttm_bo_validate);
1160
1161 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1162                                 struct ttm_placement *placement)
1163 {
1164         BUG_ON((placement->fpfn || placement->lpfn) &&
1165                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1166
1167         return 0;
1168 }
1169
1170 int ttm_bo_init(struct ttm_bo_device *bdev,
1171                 struct ttm_buffer_object *bo,
1172                 unsigned long size,
1173                 enum ttm_bo_type type,
1174                 struct ttm_placement *placement,
1175                 uint32_t page_alignment,
1176                 unsigned long buffer_start,
1177                 bool interruptible,
1178                 struct file *persistent_swap_storage,
1179                 size_t acc_size,
1180                 void (*destroy) (struct ttm_buffer_object *))
1181 {
1182         int ret = 0;
1183         unsigned long num_pages;
1184
1185         size += buffer_start & ~PAGE_MASK;
1186         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1187         if (num_pages == 0) {
1188                 printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
1189                 if (destroy)
1190                         (*destroy)(bo);
1191                 else
1192                         kfree(bo);
1193                 return -EINVAL;
1194         }
1195         bo->destroy = destroy;
1196
1197         kref_init(&bo->kref);
1198         kref_init(&bo->list_kref);
1199         atomic_set(&bo->cpu_writers, 0);
1200         atomic_set(&bo->reserved, 1);
1201         init_waitqueue_head(&bo->event_queue);
1202         INIT_LIST_HEAD(&bo->lru);
1203         INIT_LIST_HEAD(&bo->ddestroy);
1204         INIT_LIST_HEAD(&bo->swap);
1205         INIT_LIST_HEAD(&bo->io_reserve_lru);
1206         bo->bdev = bdev;
1207         bo->glob = bdev->glob;
1208         bo->type = type;
1209         bo->num_pages = num_pages;
1210         bo->mem.size = num_pages << PAGE_SHIFT;
1211         bo->mem.mem_type = TTM_PL_SYSTEM;
1212         bo->mem.num_pages = bo->num_pages;
1213         bo->mem.mm_node = NULL;
1214         bo->mem.page_alignment = page_alignment;
1215         bo->mem.bus.io_reserved_vm = false;
1216         bo->mem.bus.io_reserved_count = 0;
1217         bo->buffer_start = buffer_start & PAGE_MASK;
1218         bo->priv_flags = 0;
1219         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1220         bo->seq_valid = false;
1221         bo->persistent_swap_storage = persistent_swap_storage;
1222         bo->acc_size = acc_size;
1223         atomic_inc(&bo->glob->bo_count);
1224
1225         ret = ttm_bo_check_placement(bo, placement);
1226         if (unlikely(ret != 0))
1227                 goto out_err;
1228
1229         /*
1230          * For ttm_bo_type_device buffers, allocate
1231          * address space from the device.
1232          */
1233         if (bo->type == ttm_bo_type_device) {
1234                 ret = ttm_bo_setup_vm(bo);
1235                 if (ret)
1236                         goto out_err;
1237         }
1238
1239         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1240         if (ret)
1241                 goto out_err;
1242
1243         ttm_bo_unreserve(bo);
1244         return 0;
1245
1246 out_err:
1247         ttm_bo_unreserve(bo);
1248         ttm_bo_unref(&bo);
1249
1250         return ret;
1251 }
1252 EXPORT_SYMBOL(ttm_bo_init);
1253
1254 static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
1255                                  unsigned long num_pages)
1256 {
1257         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
1258             PAGE_MASK;
1259
1260         return glob->ttm_bo_size + 2 * page_array_size;
1261 }
1262
1263 int ttm_bo_create(struct ttm_bo_device *bdev,
1264                         unsigned long size,
1265                         enum ttm_bo_type type,
1266                         struct ttm_placement *placement,
1267                         uint32_t page_alignment,
1268                         unsigned long buffer_start,
1269                         bool interruptible,
1270                         struct file *persistent_swap_storage,
1271                         struct ttm_buffer_object **p_bo)
1272 {
1273         struct ttm_buffer_object *bo;
1274         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1275         int ret;
1276
1277         size_t acc_size =
1278             ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
1279         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1280         if (unlikely(ret != 0))
1281                 return ret;
1282
1283         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1284
1285         if (unlikely(bo == NULL)) {
1286                 ttm_mem_global_free(mem_glob, acc_size);
1287                 return -ENOMEM;
1288         }
1289
1290         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1291                                 buffer_start, interruptible,
1292                                 persistent_swap_storage, acc_size, NULL);
1293         if (likely(ret == 0))
1294                 *p_bo = bo;
1295
1296         return ret;
1297 }
1298 EXPORT_SYMBOL(ttm_bo_create);
1299
1300 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1301                                         unsigned mem_type, bool allow_errors)
1302 {
1303         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1304         struct ttm_bo_global *glob = bdev->glob;
1305         int ret;
1306
1307         /*
1308          * Can't use standard list traversal since we're unlocking.
1309          */
1310
1311         spin_lock(&glob->lru_lock);
1312         while (!list_empty(&man->lru)) {
1313                 spin_unlock(&glob->lru_lock);
1314                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1315                 if (ret) {
1316                         if (allow_errors) {
1317                                 return ret;
1318                         } else {
1319                                 printk(KERN_ERR TTM_PFX
1320                                         "Cleanup eviction failed\n");
1321                         }
1322                 }
1323                 spin_lock(&glob->lru_lock);
1324         }
1325         spin_unlock(&glob->lru_lock);
1326         return 0;
1327 }
1328
1329 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1330 {
1331         struct ttm_mem_type_manager *man;
1332         int ret = -EINVAL;
1333
1334         if (mem_type >= TTM_NUM_MEM_TYPES) {
1335                 printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type);
1336                 return ret;
1337         }
1338         man = &bdev->man[mem_type];
1339
1340         if (!man->has_type) {
1341                 printk(KERN_ERR TTM_PFX "Trying to take down uninitialized "
1342                        "memory manager type %u\n", mem_type);
1343                 return ret;
1344         }
1345
1346         man->use_type = false;
1347         man->has_type = false;
1348
1349         ret = 0;
1350         if (mem_type > 0) {
1351                 ttm_bo_force_list_clean(bdev, mem_type, false);
1352
1353                 ret = (*man->func->takedown)(man);
1354         }
1355
1356         return ret;
1357 }
1358 EXPORT_SYMBOL(ttm_bo_clean_mm);
1359
1360 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1361 {
1362         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1363
1364         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1365                 printk(KERN_ERR TTM_PFX
1366                        "Illegal memory manager memory type %u.\n",
1367                        mem_type);
1368                 return -EINVAL;
1369         }
1370
1371         if (!man->has_type) {
1372                 printk(KERN_ERR TTM_PFX
1373                        "Memory type %u has not been initialized.\n",
1374                        mem_type);
1375                 return 0;
1376         }
1377
1378         return ttm_bo_force_list_clean(bdev, mem_type, true);
1379 }
1380 EXPORT_SYMBOL(ttm_bo_evict_mm);
1381
1382 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1383                         unsigned long p_size)
1384 {
1385         int ret = -EINVAL;
1386         struct ttm_mem_type_manager *man;
1387
1388         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1389         man = &bdev->man[type];
1390         BUG_ON(man->has_type);
1391         man->io_reserve_fastpath = true;
1392         man->use_io_reserve_lru = false;
1393         mutex_init(&man->io_reserve_mutex);
1394         INIT_LIST_HEAD(&man->io_reserve_lru);
1395
1396         ret = bdev->driver->init_mem_type(bdev, type, man);
1397         if (ret)
1398                 return ret;
1399         man->bdev = bdev;
1400
1401         ret = 0;
1402         if (type != TTM_PL_SYSTEM) {
1403                 ret = (*man->func->init)(man, p_size);
1404                 if (ret)
1405                         return ret;
1406         }
1407         man->has_type = true;
1408         man->use_type = true;
1409         man->size = p_size;
1410
1411         INIT_LIST_HEAD(&man->lru);
1412
1413         return 0;
1414 }
1415 EXPORT_SYMBOL(ttm_bo_init_mm);
1416
1417 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1418 {
1419         struct ttm_bo_global *glob =
1420                 container_of(kobj, struct ttm_bo_global, kobj);
1421
1422         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1423         __free_page(glob->dummy_read_page);
1424         kfree(glob);
1425 }
1426
1427 void ttm_bo_global_release(struct drm_global_reference *ref)
1428 {
1429         struct ttm_bo_global *glob = ref->object;
1430
1431         kobject_del(&glob->kobj);
1432         kobject_put(&glob->kobj);
1433 }
1434 EXPORT_SYMBOL(ttm_bo_global_release);
1435
1436 int ttm_bo_global_init(struct drm_global_reference *ref)
1437 {
1438         struct ttm_bo_global_ref *bo_ref =
1439                 container_of(ref, struct ttm_bo_global_ref, ref);
1440         struct ttm_bo_global *glob = ref->object;
1441         int ret;
1442
1443         mutex_init(&glob->device_list_mutex);
1444         spin_lock_init(&glob->lru_lock);
1445         glob->mem_glob = bo_ref->mem_glob;
1446         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1447
1448         if (unlikely(glob->dummy_read_page == NULL)) {
1449                 ret = -ENOMEM;
1450                 goto out_no_drp;
1451         }
1452
1453         INIT_LIST_HEAD(&glob->swap_lru);
1454         INIT_LIST_HEAD(&glob->device_list);
1455
1456         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1457         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1458         if (unlikely(ret != 0)) {
1459                 printk(KERN_ERR TTM_PFX
1460                        "Could not register buffer object swapout.\n");
1461                 goto out_no_shrink;
1462         }
1463
1464         glob->ttm_bo_extra_size =
1465                 ttm_round_pot(sizeof(struct ttm_tt)) +
1466                 ttm_round_pot(sizeof(struct ttm_backend));
1467
1468         glob->ttm_bo_size = glob->ttm_bo_extra_size +
1469                 ttm_round_pot(sizeof(struct ttm_buffer_object));
1470
1471         atomic_set(&glob->bo_count, 0);
1472
1473         ret = kobject_init_and_add(
1474                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1475         if (unlikely(ret != 0))
1476                 kobject_put(&glob->kobj);
1477         return ret;
1478 out_no_shrink:
1479         __free_page(glob->dummy_read_page);
1480 out_no_drp:
1481         kfree(glob);
1482         return ret;
1483 }
1484 EXPORT_SYMBOL(ttm_bo_global_init);
1485
1486
1487 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1488 {
1489         int ret = 0;
1490         unsigned i = TTM_NUM_MEM_TYPES;
1491         struct ttm_mem_type_manager *man;
1492         struct ttm_bo_global *glob = bdev->glob;
1493
1494         while (i--) {
1495                 man = &bdev->man[i];
1496                 if (man->has_type) {
1497                         man->use_type = false;
1498                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1499                                 ret = -EBUSY;
1500                                 printk(KERN_ERR TTM_PFX
1501                                        "DRM memory manager type %d "
1502                                        "is not clean.\n", i);
1503                         }
1504                         man->has_type = false;
1505                 }
1506         }
1507
1508         mutex_lock(&glob->device_list_mutex);
1509         list_del(&bdev->device_list);
1510         mutex_unlock(&glob->device_list_mutex);
1511
1512         cancel_delayed_work_sync(&bdev->wq);
1513
1514         while (ttm_bo_delayed_delete(bdev, true))
1515                 ;
1516
1517         spin_lock(&glob->lru_lock);
1518         if (list_empty(&bdev->ddestroy))
1519                 TTM_DEBUG("Delayed destroy list was clean\n");
1520
1521         if (list_empty(&bdev->man[0].lru))
1522                 TTM_DEBUG("Swap list was clean\n");
1523         spin_unlock(&glob->lru_lock);
1524
1525         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1526         write_lock(&bdev->vm_lock);
1527         drm_mm_takedown(&bdev->addr_space_mm);
1528         write_unlock(&bdev->vm_lock);
1529
1530         return ret;
1531 }
1532 EXPORT_SYMBOL(ttm_bo_device_release);
1533
1534 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1535                        struct ttm_bo_global *glob,
1536                        struct ttm_bo_driver *driver,
1537                        uint64_t file_page_offset,
1538                        bool need_dma32)
1539 {
1540         int ret = -EINVAL;
1541
1542         rwlock_init(&bdev->vm_lock);
1543         bdev->driver = driver;
1544
1545         memset(bdev->man, 0, sizeof(bdev->man));
1546
1547         /*
1548          * Initialize the system memory buffer type.
1549          * Other types need to be driver / IOCTL initialized.
1550          */
1551         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1552         if (unlikely(ret != 0))
1553                 goto out_no_sys;
1554
1555         bdev->addr_space_rb = RB_ROOT;
1556         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1557         if (unlikely(ret != 0))
1558                 goto out_no_addr_mm;
1559
1560         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1561         bdev->nice_mode = true;
1562         INIT_LIST_HEAD(&bdev->ddestroy);
1563         bdev->dev_mapping = NULL;
1564         bdev->glob = glob;
1565         bdev->need_dma32 = need_dma32;
1566         bdev->val_seq = 0;
1567         spin_lock_init(&bdev->fence_lock);
1568         mutex_lock(&glob->device_list_mutex);
1569         list_add_tail(&bdev->device_list, &glob->device_list);
1570         mutex_unlock(&glob->device_list_mutex);
1571
1572         return 0;
1573 out_no_addr_mm:
1574         ttm_bo_clean_mm(bdev, 0);
1575 out_no_sys:
1576         return ret;
1577 }
1578 EXPORT_SYMBOL(ttm_bo_device_init);
1579
1580 /*
1581  * buffer object vm functions.
1582  */
1583
1584 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1585 {
1586         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1587
1588         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1589                 if (mem->mem_type == TTM_PL_SYSTEM)
1590                         return false;
1591
1592                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1593                         return false;
1594
1595                 if (mem->placement & TTM_PL_FLAG_CACHED)
1596                         return false;
1597         }
1598         return true;
1599 }
1600
1601 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1602 {
1603         struct ttm_bo_device *bdev = bo->bdev;
1604         loff_t offset = (loff_t) bo->addr_space_offset;
1605         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1606
1607         if (!bdev->dev_mapping)
1608                 return;
1609         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1610         ttm_mem_io_free_vm(bo);
1611 }
1612
1613 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1614 {
1615         struct ttm_bo_device *bdev = bo->bdev;
1616         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1617
1618         ttm_mem_io_lock(man, false);
1619         ttm_bo_unmap_virtual_locked(bo);
1620         ttm_mem_io_unlock(man);
1621 }
1622
1623
1624 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1625
1626 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1627 {
1628         struct ttm_bo_device *bdev = bo->bdev;
1629         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1630         struct rb_node *parent = NULL;
1631         struct ttm_buffer_object *cur_bo;
1632         unsigned long offset = bo->vm_node->start;
1633         unsigned long cur_offset;
1634
1635         while (*cur) {
1636                 parent = *cur;
1637                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1638                 cur_offset = cur_bo->vm_node->start;
1639                 if (offset < cur_offset)
1640                         cur = &parent->rb_left;
1641                 else if (offset > cur_offset)
1642                         cur = &parent->rb_right;
1643                 else
1644                         BUG();
1645         }
1646
1647         rb_link_node(&bo->vm_rb, parent, cur);
1648         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1649 }
1650
1651 /**
1652  * ttm_bo_setup_vm:
1653  *
1654  * @bo: the buffer to allocate address space for
1655  *
1656  * Allocate address space in the drm device so that applications
1657  * can mmap the buffer and access the contents. This only
1658  * applies to ttm_bo_type_device objects as others are not
1659  * placed in the drm device address space.
1660  */
1661
1662 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1663 {
1664         struct ttm_bo_device *bdev = bo->bdev;
1665         int ret;
1666
1667 retry_pre_get:
1668         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1669         if (unlikely(ret != 0))
1670                 return ret;
1671
1672         write_lock(&bdev->vm_lock);
1673         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1674                                          bo->mem.num_pages, 0, 0);
1675
1676         if (unlikely(bo->vm_node == NULL)) {
1677                 ret = -ENOMEM;
1678                 goto out_unlock;
1679         }
1680
1681         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1682                                               bo->mem.num_pages, 0);
1683
1684         if (unlikely(bo->vm_node == NULL)) {
1685                 write_unlock(&bdev->vm_lock);
1686                 goto retry_pre_get;
1687         }
1688
1689         ttm_bo_vm_insert_rb(bo);
1690         write_unlock(&bdev->vm_lock);
1691         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1692
1693         return 0;
1694 out_unlock:
1695         write_unlock(&bdev->vm_lock);
1696         return ret;
1697 }
1698
1699 static void ttm_bo_unref_sync_obj_locked(struct ttm_buffer_object *bo,
1700                                          void *sync_obj,
1701                                          void **extra_sync_obj)
1702 {
1703         struct ttm_bo_device *bdev = bo->bdev;
1704         struct ttm_bo_driver *driver = bdev->driver;
1705         void *tmp_obj = NULL, *tmp_obj_read = NULL, *tmp_obj_write = NULL;
1706
1707         /* We must unref the sync obj wherever it's ref'd.
1708          * Note that if we unref bo->sync_obj, we can unref both the read
1709          * and write sync objs too, because they can't be newer than
1710          * bo->sync_obj, so they are no longer relevant. */
1711         if (sync_obj == bo->sync_obj ||
1712             sync_obj == bo->sync_obj_read) {
1713                 tmp_obj_read = bo->sync_obj_read;
1714                 bo->sync_obj_read = NULL;
1715         }
1716         if (sync_obj == bo->sync_obj ||
1717             sync_obj == bo->sync_obj_write) {
1718                 tmp_obj_write = bo->sync_obj_write;
1719                 bo->sync_obj_write = NULL;
1720         }
1721         if (sync_obj == bo->sync_obj) {
1722                 tmp_obj = bo->sync_obj;
1723                 bo->sync_obj = NULL;
1724         }
1725
1726         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1727         spin_unlock(&bdev->fence_lock);
1728         if (tmp_obj)
1729                 driver->sync_obj_unref(&tmp_obj);
1730         if (tmp_obj_read)
1731                 driver->sync_obj_unref(&tmp_obj_read);
1732         if (tmp_obj_write)
1733                 driver->sync_obj_unref(&tmp_obj_write);
1734         if (extra_sync_obj)
1735                 driver->sync_obj_unref(extra_sync_obj);
1736         spin_lock(&bdev->fence_lock);
1737 }
1738
1739 int ttm_bo_wait(struct ttm_buffer_object *bo,
1740                 bool lazy, bool interruptible, bool no_wait,
1741                 enum ttm_buffer_usage usage)
1742 {
1743         struct ttm_bo_driver *driver = bo->bdev->driver;
1744         struct ttm_bo_device *bdev = bo->bdev;
1745         void *sync_obj;
1746         void *sync_obj_arg;
1747         int ret = 0;
1748         void **bo_sync_obj;
1749
1750         switch (usage) {
1751         case TTM_USAGE_READ:
1752                 bo_sync_obj = &bo->sync_obj_read;
1753                 break;
1754         case TTM_USAGE_WRITE:
1755                 bo_sync_obj = &bo->sync_obj_write;
1756                 break;
1757         case TTM_USAGE_READWRITE:
1758         default:
1759                 bo_sync_obj = &bo->sync_obj;
1760         }
1761
1762         if (likely(*bo_sync_obj == NULL))
1763                 return 0;
1764
1765         while (*bo_sync_obj) {
1766
1767                 if (driver->sync_obj_signaled(*bo_sync_obj, bo->sync_obj_arg)) {
1768                         ttm_bo_unref_sync_obj_locked(bo, *bo_sync_obj, NULL);
1769                         continue;
1770                 }
1771
1772                 if (no_wait)
1773                         return -EBUSY;
1774
1775                 sync_obj = driver->sync_obj_ref(*bo_sync_obj);
1776                 sync_obj_arg = bo->sync_obj_arg;
1777                 spin_unlock(&bdev->fence_lock);
1778                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1779                                             lazy, interruptible);
1780                 if (unlikely(ret != 0)) {
1781                         driver->sync_obj_unref(&sync_obj);
1782                         spin_lock(&bdev->fence_lock);
1783                         return ret;
1784                 }
1785                 spin_lock(&bdev->fence_lock);
1786                 if (likely(*bo_sync_obj == sync_obj &&
1787                            bo->sync_obj_arg == sync_obj_arg)) {
1788                         ttm_bo_unref_sync_obj_locked(bo, *bo_sync_obj, &sync_obj);
1789                 } else {
1790                         spin_unlock(&bdev->fence_lock);
1791                         driver->sync_obj_unref(&sync_obj);
1792                         spin_lock(&bdev->fence_lock);
1793                 }
1794         }
1795         return 0;
1796 }
1797 EXPORT_SYMBOL(ttm_bo_wait);
1798
1799 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1800 {
1801         struct ttm_bo_device *bdev = bo->bdev;
1802         int ret = 0;
1803
1804         /*
1805          * Using ttm_bo_reserve makes sure the lru lists are updated.
1806          */
1807
1808         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1809         if (unlikely(ret != 0))
1810                 return ret;
1811         spin_lock(&bdev->fence_lock);
1812         ret = ttm_bo_wait(bo, false, true, no_wait, TTM_USAGE_READWRITE);
1813         spin_unlock(&bdev->fence_lock);
1814         if (likely(ret == 0))
1815                 atomic_inc(&bo->cpu_writers);
1816         ttm_bo_unreserve(bo);
1817         return ret;
1818 }
1819 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1820
1821 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1822 {
1823         if (atomic_dec_and_test(&bo->cpu_writers))
1824                 wake_up_all(&bo->event_queue);
1825 }
1826 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1827
1828 /**
1829  * A buffer object shrink method that tries to swap out the first
1830  * buffer object on the bo_global::swap_lru list.
1831  */
1832
1833 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1834 {
1835         struct ttm_bo_global *glob =
1836             container_of(shrink, struct ttm_bo_global, shrink);
1837         struct ttm_buffer_object *bo;
1838         int ret = -EBUSY;
1839         int put_count;
1840         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1841
1842         spin_lock(&glob->lru_lock);
1843         while (ret == -EBUSY) {
1844                 if (unlikely(list_empty(&glob->swap_lru))) {
1845                         spin_unlock(&glob->lru_lock);
1846                         return -EBUSY;
1847                 }
1848
1849                 bo = list_first_entry(&glob->swap_lru,
1850                                       struct ttm_buffer_object, swap);
1851                 kref_get(&bo->list_kref);
1852
1853                 if (!list_empty(&bo->ddestroy)) {
1854                         spin_unlock(&glob->lru_lock);
1855                         (void) ttm_bo_cleanup_refs(bo, false, false, false);
1856                         kref_put(&bo->list_kref, ttm_bo_release_list);
1857                         continue;
1858                 }
1859
1860                 /**
1861                  * Reserve buffer. Since we unlock while sleeping, we need
1862                  * to re-check that nobody removed us from the swap-list while
1863                  * we slept.
1864                  */
1865
1866                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1867                 if (unlikely(ret == -EBUSY)) {
1868                         spin_unlock(&glob->lru_lock);
1869                         ttm_bo_wait_unreserved(bo, false);
1870                         kref_put(&bo->list_kref, ttm_bo_release_list);
1871                         spin_lock(&glob->lru_lock);
1872                 }
1873         }
1874
1875         BUG_ON(ret != 0);
1876         put_count = ttm_bo_del_from_lru(bo);
1877         spin_unlock(&glob->lru_lock);
1878
1879         ttm_bo_list_ref_sub(bo, put_count, true);
1880
1881         /**
1882          * Wait for GPU, then move to system cached.
1883          */
1884
1885         spin_lock(&bo->bdev->fence_lock);
1886         ret = ttm_bo_wait(bo, false, false, false, TTM_USAGE_READWRITE);
1887         spin_unlock(&bo->bdev->fence_lock);
1888
1889         if (unlikely(ret != 0))
1890                 goto out;
1891
1892         if ((bo->mem.placement & swap_placement) != swap_placement) {
1893                 struct ttm_mem_reg evict_mem;
1894
1895                 evict_mem = bo->mem;
1896                 evict_mem.mm_node = NULL;
1897                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1898                 evict_mem.mem_type = TTM_PL_SYSTEM;
1899
1900                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1901                                              false, false, false);
1902                 if (unlikely(ret != 0))
1903                         goto out;
1904         }
1905
1906         ttm_bo_unmap_virtual(bo);
1907
1908         /**
1909          * Swap out. Buffer will be swapped in again as soon as
1910          * anyone tries to access a ttm page.
1911          */
1912
1913         if (bo->bdev->driver->swap_notify)
1914                 bo->bdev->driver->swap_notify(bo);
1915
1916         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1917 out:
1918
1919         /**
1920          *
1921          * Unreserve without putting on LRU to avoid swapping out an
1922          * already swapped buffer.
1923          */
1924
1925         atomic_set(&bo->reserved, 0);
1926         wake_up_all(&bo->event_queue);
1927         kref_put(&bo->list_kref, ttm_bo_release_list);
1928         return ret;
1929 }
1930
1931 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1932 {
1933         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1934                 ;
1935 }
1936 EXPORT_SYMBOL(ttm_bo_swapout_all);