drivers/gpu/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #define pr_fmt(fmt) "[TTM] " fmt
  32
  33 #include "ttm/ttm_module.h"
  34 #include "ttm/ttm_bo_driver.h"
  35 #include "ttm/ttm_placement.h"
  36 #include <linux/jiffies.h>
  37 #include <linux/slab.h>
  38 #include <linux/sched.h>
  39 #include <linux/mm.h>
  40 #include <linux/file.h>
  41 #include <linux/module.h>
  42 #include <linux/atomic.h>
  43
  44 #define TTM_ASSERT_LOCKED(param)
  45 #define TTM_DEBUG(fmt, arg...)
  46 #define TTM_BO_HASH_ORDER 13
  47
  48 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  49 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  50 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  51
  52 static struct attribute ttm_bo_count = {
  53         .name = "bo_count",
  54         .mode = S_IRUGO
  55 };
  56
  57 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  58 {
  59         int i;
  60
  61         for (i = 0; i <= TTM_PL_PRIV5; i++)
  62                 if (flags & (1 << i)) {
  63                         *mem_type = i;
  64                         return 0;
  65                 }
  66         return -EINVAL;
  67 }
  68
  69 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  70 {
  71         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  72
  73         pr_err("    has_type: %d\n", man->has_type);
  74         pr_err("    use_type: %d\n", man->use_type);
  75         pr_err("    flags: 0x%08X\n", man->flags);
  76         pr_err("    gpu_offset: 0x%08lX\n", man->gpu_offset);
  77         pr_err("    size: %llu\n", man->size);
  78         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  79         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  80         if (mem_type != TTM_PL_SYSTEM)
  81                 (*man->func->debug)(man, TTM_PFX);
  82 }
  83
  84 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  85                                         struct ttm_placement *placement)
  86 {
  87         int i, ret, mem_type;
  88
  89         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  90                bo, bo->mem.num_pages, bo->mem.size >> 10,
  91                bo->mem.size >> 20);
  92         for (i = 0; i < placement->num_placement; i++) {
  93                 ret = ttm_mem_type_from_flags(placement->placement[i],
  94                                                 &mem_type);
  95                 if (ret)
  96                         return;
  97                 pr_err("  placement[%d]=0x%08X (%d)\n",
  98                        i, placement->placement[i], mem_type);
  99                 ttm_mem_type_debug(bo->bdev, mem_type);
 100         }
 101 }
 102
 103 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 104                                   struct attribute *attr,
 105                                   char *buffer)
 106 {
 107         struct ttm_bo_global *glob =
 108                 container_of(kobj, struct ttm_bo_global, kobj);
 109
 110         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 111                         (unsigned long) atomic_read(&glob->bo_count));
 112 }
 113
 114 static struct attribute *ttm_bo_global_attrs[] = {
 115         &ttm_bo_count,
 116         NULL
 117 };
 118
 119 static const struct sysfs_ops ttm_bo_global_ops = {
 120         .show = &ttm_bo_global_show
 121 };
 122
 123 static struct kobj_type ttm_bo_glob_kobj_type  = {
 124         .release = &ttm_bo_global_kobj_release,
 125         .sysfs_ops = &ttm_bo_global_ops,
 126         .default_attrs = ttm_bo_global_attrs
 127 };
 128
 129
 130 static inline uint32_t ttm_bo_type_flags(unsigned type)
 131 {
 132         return 1 << (type);
 133 }
 134
 135 static void ttm_bo_release_list(struct kref *list_kref)
 136 {
 137         struct ttm_buffer_object *bo =
 138             container_of(list_kref, struct ttm_buffer_object, list_kref);
 139         struct ttm_bo_device *bdev = bo->bdev;
 140         size_t acc_size = bo->acc_size;
 141
 142         BUG_ON(atomic_read(&bo->list_kref.refcount));
 143         BUG_ON(atomic_read(&bo->kref.refcount));
 144         BUG_ON(atomic_read(&bo->cpu_writers));
 145         BUG_ON(bo->sync_obj != NULL);
 146         BUG_ON(bo->mem.mm_node != NULL);
 147         BUG_ON(!list_empty(&bo->lru));
 148         BUG_ON(!list_empty(&bo->ddestroy));
 149
 150         if (bo->ttm)
 151                 ttm_tt_destroy(bo->ttm);
 152         atomic_dec(&bo->glob->bo_count);
 153         if (bo->destroy)
 154                 bo->destroy(bo);
 155         else {
 156                 kfree(bo);
 157         }
 158         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 159 }
 160
 161 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible)
 162 {
 163         if (interruptible) {
 164                 return wait_event_interruptible(bo->event_queue,
 165                                                atomic_read(&bo->reserved) == 0);
 166         } else {
 167                 wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0);
 168                 return 0;
 169         }
 170 }
 171 EXPORT_SYMBOL(ttm_bo_wait_unreserved);
 172
 173 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 174 {
 175         struct ttm_bo_device *bdev = bo->bdev;
 176         struct ttm_mem_type_manager *man;
 177
 178         BUG_ON(!atomic_read(&bo->reserved));
 179
 180         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 181
 182                 BUG_ON(!list_empty(&bo->lru));
 183
 184                 man = &bdev->man[bo->mem.mem_type];
 185                 list_add_tail(&bo->lru, &man->lru);
 186                 kref_get(&bo->list_kref);
 187
 188                 if (bo->ttm != NULL) {
 189                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 190                         kref_get(&bo->list_kref);
 191                 }
 192         }
 193 }
 194
 195 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 196 {
 197         int put_count = 0;
 198
 199         if (!list_empty(&bo->swap)) {
 200                 list_del_init(&bo->swap);
 201                 ++put_count;
 202         }
 203         if (!list_empty(&bo->lru)) {
 204                 list_del_init(&bo->lru);
 205                 ++put_count;
 206         }
 207
 208         /*
 209          * TODO: Add a driver hook to delete from
 210          * driver-specific LRU's here.
 211          */
 212
 213         return put_count;
 214 }
 215
 216 int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
 217                           bool interruptible,
 218                           bool no_wait, bool use_sequence, uint32_t sequence)
 219 {
 220         struct ttm_bo_global *glob = bo->glob;
 221         int ret;
 222
 223         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
 224                 /**
 225                  * Deadlock avoidance for multi-bo reserving.
 226                  */
 227                 if (use_sequence && bo->seq_valid) {
 228                         /**
 229                          * We've already reserved this one.
 230                          */
 231                         if (unlikely(sequence == bo->val_seq))
 232                                 return -EDEADLK;
 233                         /**
 234                          * Already reserved by a thread that will not back
 235                          * off for us. We need to back off.
 236                          */
 237                         if (unlikely(sequence - bo->val_seq < (1 << 31)))
 238                                 return -EAGAIN;
 239                 }
 240
 241                 if (no_wait)
 242                         return -EBUSY;
 243
 244                 spin_unlock(&glob->lru_lock);
 245                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 246                 spin_lock(&glob->lru_lock);
 247
 248                 if (unlikely(ret))
 249                         return ret;
 250         }
 251
 252         if (use_sequence) {
 253                 /**
 254                  * Wake up waiters that may need to recheck for deadlock,
 255                  * if we decreased the sequence number.
 256                  */
 257                 if (unlikely((bo->val_seq - sequence < (1 << 31))
 258                              || !bo->seq_valid))
 259                         wake_up_all(&bo->event_queue);
 260
 261                 bo->val_seq = sequence;
 262                 bo->seq_valid = true;
 263         } else {
 264                 bo->seq_valid = false;
 265         }
 266
 267         return 0;
 268 }
 269 EXPORT_SYMBOL(ttm_bo_reserve);
 270
 271 static void ttm_bo_ref_bug(struct kref *list_kref)
 272 {
 273         BUG();
 274 }
 275
 276 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 277                          bool never_free)
 278 {
 279         kref_sub(&bo->list_kref, count,
 280                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 281 }
 282
 283 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 284                    bool interruptible,
 285                    bool no_wait, bool use_sequence, uint32_t sequence)
 286 {
 287         struct ttm_bo_global *glob = bo->glob;
 288         int put_count = 0;
 289         int ret;
 290
 291         spin_lock(&glob->lru_lock);
 292         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
 293                                     sequence);
 294         if (likely(ret == 0))
 295                 put_count = ttm_bo_del_from_lru(bo);
 296         spin_unlock(&glob->lru_lock);
 297
 298         ttm_bo_list_ref_sub(bo, put_count, true);
 299
 300         return ret;
 301 }
 302
 303 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
 304 {
 305         ttm_bo_add_to_lru(bo);
 306         atomic_set(&bo->reserved, 0);
 307         wake_up_all(&bo->event_queue);
 308 }
 309
 310 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 311 {
 312         struct ttm_bo_global *glob = bo->glob;
 313
 314         spin_lock(&glob->lru_lock);
 315         ttm_bo_unreserve_locked(bo);
 316         spin_unlock(&glob->lru_lock);
 317 }
 318 EXPORT_SYMBOL(ttm_bo_unreserve);
 319
 320 /*
 321  * Call bo->mutex locked.
 322  */
 323 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 324 {
 325         struct ttm_bo_device *bdev = bo->bdev;
 326         struct ttm_bo_global *glob = bo->glob;
 327         int ret = 0;
 328         uint32_t page_flags = 0;
 329
 330         TTM_ASSERT_LOCKED(&bo->mutex);
 331         bo->ttm = NULL;
 332
 333         if (bdev->need_dma32)
 334                 page_flags |= TTM_PAGE_FLAG_DMA32;
 335
 336         switch (bo->type) {
 337         case ttm_bo_type_device:
 338                 if (zero_alloc)
 339                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 340         case ttm_bo_type_kernel:
 341                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 342                                                       page_flags, glob->dummy_read_page);
 343                 if (unlikely(bo->ttm == NULL))
 344                         ret = -ENOMEM;
 345                 break;
 346         default:
 347                 pr_err("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                         pr_err("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                         pr_err("Failed to expire sync object before 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                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 759                                bo);
 760                         ttm_bo_mem_space_debug(bo, &placement);
 761                 }
 762                 goto out;
 763         }
 764
 765         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 766                                      no_wait_reserve, no_wait_gpu);
 767         if (ret) {
 768                 if (ret != -ERESTARTSYS)
 769                         pr_err("Buffer eviction failed\n");
 770                 ttm_bo_mem_put(bo, &evict_mem);
 771                 goto out;
 772         }
 773         bo->evicted = true;
 774 out:
 775         return ret;
 776 }
 777
 778 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 779                                 uint32_t mem_type,
 780                                 bool interruptible, bool no_wait_reserve,
 781                                 bool no_wait_gpu)
 782 {
 783         struct ttm_bo_global *glob = bdev->glob;
 784         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 785         struct ttm_buffer_object *bo;
 786         int ret, put_count = 0;
 787
 788 retry:
 789         spin_lock(&glob->lru_lock);
 790         if (list_empty(&man->lru)) {
 791                 spin_unlock(&glob->lru_lock);
 792                 return -EBUSY;
 793         }
 794
 795         bo = list_first_entry(&man->lru, struct ttm_buffer_object, lru);
 796         kref_get(&bo->list_kref);
 797
 798         if (!list_empty(&bo->ddestroy)) {
 799                 spin_unlock(&glob->lru_lock);
 800                 ret = ttm_bo_cleanup_refs(bo, interruptible,
 801                                           no_wait_reserve, no_wait_gpu);
 802                 kref_put(&bo->list_kref, ttm_bo_release_list);
 803
 804                 if (likely(ret == 0 || ret == -ERESTARTSYS))
 805                         return ret;
 806
 807                 goto retry;
 808         }
 809
 810         ret = ttm_bo_reserve_locked(bo, false, no_wait_reserve, false, 0);
 811
 812         if (unlikely(ret == -EBUSY)) {
 813                 spin_unlock(&glob->lru_lock);
 814                 if (likely(!no_wait_gpu))
 815                         ret = ttm_bo_wait_unreserved(bo, interruptible);
 816
 817                 kref_put(&bo->list_kref, ttm_bo_release_list);
 818
 819                 /**
 820                  * We *need* to retry after releasing the lru lock.
 821                  */
 822
 823                 if (unlikely(ret != 0))
 824                         return ret;
 825                 goto retry;
 826         }
 827
 828         put_count = ttm_bo_del_from_lru(bo);
 829         spin_unlock(&glob->lru_lock);
 830
 831         BUG_ON(ret != 0);
 832
 833         ttm_bo_list_ref_sub(bo, put_count, true);
 834
 835         ret = ttm_bo_evict(bo, interruptible, no_wait_reserve, no_wait_gpu);
 836         ttm_bo_unreserve(bo);
 837
 838         kref_put(&bo->list_kref, ttm_bo_release_list);
 839         return ret;
 840 }
 841
 842 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 843 {
 844         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 845
 846         if (mem->mm_node)
 847                 (*man->func->put_node)(man, mem);
 848 }
 849 EXPORT_SYMBOL(ttm_bo_mem_put);
 850
 851 /**
 852  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 853  * space, or we've evicted everything and there isn't enough space.
 854  */
 855 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 856                                         uint32_t mem_type,
 857                                         struct ttm_placement *placement,
 858                                         struct ttm_mem_reg *mem,
 859                                         bool interruptible,
 860                                         bool no_wait_reserve,
 861                                         bool no_wait_gpu)
 862 {
 863         struct ttm_bo_device *bdev = bo->bdev;
 864         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 865         int ret;
 866
 867         do {
 868                 ret = (*man->func->get_node)(man, bo, placement, mem);
 869                 if (unlikely(ret != 0))
 870                         return ret;
 871                 if (mem->mm_node)
 872                         break;
 873                 ret = ttm_mem_evict_first(bdev, mem_type, interruptible,
 874                                                 no_wait_reserve, no_wait_gpu);
 875                 if (unlikely(ret != 0))
 876                         return ret;
 877         } while (1);
 878         if (mem->mm_node == NULL)
 879                 return -ENOMEM;
 880         mem->mem_type = mem_type;
 881         return 0;
 882 }
 883
 884 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 885                                       uint32_t cur_placement,
 886                                       uint32_t proposed_placement)
 887 {
 888         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 889         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 890
 891         /**
 892          * Keep current caching if possible.
 893          */
 894
 895         if ((cur_placement & caching) != 0)
 896                 result |= (cur_placement & caching);
 897         else if ((man->default_caching & caching) != 0)
 898                 result |= man->default_caching;
 899         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 900                 result |= TTM_PL_FLAG_CACHED;
 901         else if ((TTM_PL_FLAG_WC & caching) != 0)
 902                 result |= TTM_PL_FLAG_WC;
 903         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 904                 result |= TTM_PL_FLAG_UNCACHED;
 905
 906         return result;
 907 }
 908
 909 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 910                                  uint32_t mem_type,
 911                                  uint32_t proposed_placement,
 912                                  uint32_t *masked_placement)
 913 {
 914         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 915
 916         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 917                 return false;
 918
 919         if ((proposed_placement & man->available_caching) == 0)
 920                 return false;
 921
 922         cur_flags |= (proposed_placement & man->available_caching);
 923
 924         *masked_placement = cur_flags;
 925         return true;
 926 }
 927
 928 /**
 929  * Creates space for memory region @mem according to its type.
 930  *
 931  * This function first searches for free space in compatible memory types in
 932  * the priority order defined by the driver.  If free space isn't found, then
 933  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 934  * space.
 935  */
 936 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 937                         struct ttm_placement *placement,
 938                         struct ttm_mem_reg *mem,
 939                         bool interruptible, bool no_wait_reserve,
 940                         bool no_wait_gpu)
 941 {
 942         struct ttm_bo_device *bdev = bo->bdev;
 943         struct ttm_mem_type_manager *man;
 944         uint32_t mem_type = TTM_PL_SYSTEM;
 945         uint32_t cur_flags = 0;
 946         bool type_found = false;
 947         bool type_ok = false;
 948         bool has_erestartsys = false;
 949         int i, ret;
 950
 951         mem->mm_node = NULL;
 952         for (i = 0; i < placement->num_placement; ++i) {
 953                 ret = ttm_mem_type_from_flags(placement->placement[i],
 954                                                 &mem_type);
 955                 if (ret)
 956                         return ret;
 957                 man = &bdev->man[mem_type];
 958
 959                 type_ok = ttm_bo_mt_compatible(man,
 960                                                 mem_type,
 961                                                 placement->placement[i],
 962                                                 &cur_flags);
 963
 964                 if (!type_ok)
 965                         continue;
 966
 967                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 968                                                   cur_flags);
 969                 /*
 970                  * Use the access and other non-mapping-related flag bits from
 971                  * the memory placement flags to the current flags
 972                  */
 973                 ttm_flag_masked(&cur_flags, placement->placement[i],
 974                                 ~TTM_PL_MASK_MEMTYPE);
 975
 976                 if (mem_type == TTM_PL_SYSTEM)
 977                         break;
 978
 979                 if (man->has_type && man->use_type) {
 980                         type_found = true;
 981                         ret = (*man->func->get_node)(man, bo, placement, mem);
 982                         if (unlikely(ret))
 983                                 return ret;
 984                 }
 985                 if (mem->mm_node)
 986                         break;
 987         }
 988
 989         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 990                 mem->mem_type = mem_type;
 991                 mem->placement = cur_flags;
 992                 return 0;
 993         }
 994
 995         if (!type_found)
 996                 return -EINVAL;
 997
 998         for (i = 0; i < placement->num_busy_placement; ++i) {
 999                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1000                                                 &mem_type);
1001                 if (ret)
1002                         return ret;
1003                 man = &bdev->man[mem_type];
1004                 if (!man->has_type)
1005                         continue;
1006                 if (!ttm_bo_mt_compatible(man,
1007                                                 mem_type,
1008                                                 placement->busy_placement[i],
1009                                                 &cur_flags))
1010                         continue;
1011
1012                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1013                                                   cur_flags);
1014                 /*
1015                  * Use the access and other non-mapping-related flag bits from
1016                  * the memory placement flags to the current flags
1017                  */
1018                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1019                                 ~TTM_PL_MASK_MEMTYPE);
1020
1021
1022                 if (mem_type == TTM_PL_SYSTEM) {
1023                         mem->mem_type = mem_type;
1024                         mem->placement = cur_flags;
1025                         mem->mm_node = NULL;
1026                         return 0;
1027                 }
1028
1029                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1030                                                 interruptible, no_wait_reserve, no_wait_gpu);
1031                 if (ret == 0 && mem->mm_node) {
1032                         mem->placement = cur_flags;
1033                         return 0;
1034                 }
1035                 if (ret == -ERESTARTSYS)
1036                         has_erestartsys = true;
1037         }
1038         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1039         return ret;
1040 }
1041 EXPORT_SYMBOL(ttm_bo_mem_space);
1042
1043 int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait)
1044 {
1045         if ((atomic_read(&bo->cpu_writers) > 0) && no_wait)
1046                 return -EBUSY;
1047
1048         return wait_event_interruptible(bo->event_queue,
1049                                         atomic_read(&bo->cpu_writers) == 0);
1050 }
1051 EXPORT_SYMBOL(ttm_bo_wait_cpu);
1052
1053 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1054                         struct ttm_placement *placement,
1055                         bool interruptible, bool no_wait_reserve,
1056                         bool no_wait_gpu)
1057 {
1058         int ret = 0;
1059         struct ttm_mem_reg mem;
1060         struct ttm_bo_device *bdev = bo->bdev;
1061
1062         BUG_ON(!atomic_read(&bo->reserved));
1063
1064         /*
1065          * FIXME: It's possible to pipeline buffer moves.
1066          * Have the driver move function wait for idle when necessary,
1067          * instead of doing it here.
1068          */
1069         spin_lock(&bdev->fence_lock);
1070         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1071         spin_unlock(&bdev->fence_lock);
1072         if (ret)
1073                 return ret;
1074         mem.num_pages = bo->num_pages;
1075         mem.size = mem.num_pages << PAGE_SHIFT;
1076         mem.page_alignment = bo->mem.page_alignment;
1077         mem.bus.io_reserved_vm = false;
1078         mem.bus.io_reserved_count = 0;
1079         /*
1080          * Determine where to move the buffer.
1081          */
1082         ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
1083         if (ret)
1084                 goto out_unlock;
1085         ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
1086 out_unlock:
1087         if (ret && mem.mm_node)
1088                 ttm_bo_mem_put(bo, &mem);
1089         return ret;
1090 }
1091
1092 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1093                              struct ttm_mem_reg *mem)
1094 {
1095         int i;
1096
1097         if (mem->mm_node && placement->lpfn != 0 &&
1098             (mem->start < placement->fpfn ||
1099              mem->start + mem->num_pages > placement->lpfn))
1100                 return -1;
1101
1102         for (i = 0; i < placement->num_placement; i++) {
1103                 if ((placement->placement[i] & mem->placement &
1104                         TTM_PL_MASK_CACHING) &&
1105                         (placement->placement[i] & mem->placement &
1106                         TTM_PL_MASK_MEM))
1107                         return i;
1108         }
1109         return -1;
1110 }
1111
1112 int ttm_bo_validate(struct ttm_buffer_object *bo,
1113                         struct ttm_placement *placement,
1114                         bool interruptible, bool no_wait_reserve,
1115                         bool no_wait_gpu)
1116 {
1117         int ret;
1118
1119         BUG_ON(!atomic_read(&bo->reserved));
1120         /* Check that range is valid */
1121         if (placement->lpfn || placement->fpfn)
1122                 if (placement->fpfn > placement->lpfn ||
1123                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1124                         return -EINVAL;
1125         /*
1126          * Check whether we need to move buffer.
1127          */
1128         ret = ttm_bo_mem_compat(placement, &bo->mem);
1129         if (ret < 0) {
1130                 ret = ttm_bo_move_buffer(bo, placement, interruptible, no_wait_reserve, no_wait_gpu);
1131                 if (ret)
1132                         return ret;
1133         } else {
1134                 /*
1135                  * Use the access and other non-mapping-related flag bits from
1136                  * the compatible memory placement flags to the active flags
1137                  */
1138                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1139                                 ~TTM_PL_MASK_MEMTYPE);
1140         }
1141         /*
1142          * We might need to add a TTM.
1143          */
1144         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1145                 ret = ttm_bo_add_ttm(bo, true);
1146                 if (ret)
1147                         return ret;
1148         }
1149         return 0;
1150 }
1151 EXPORT_SYMBOL(ttm_bo_validate);
1152
1153 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1154                                 struct ttm_placement *placement)
1155 {
1156         BUG_ON((placement->fpfn || placement->lpfn) &&
1157                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1158
1159         return 0;
1160 }
1161
1162 int ttm_bo_init(struct ttm_bo_device *bdev,
1163                 struct ttm_buffer_object *bo,
1164                 unsigned long size,
1165                 enum ttm_bo_type type,
1166                 struct ttm_placement *placement,
1167                 uint32_t page_alignment,
1168                 unsigned long buffer_start,
1169                 bool interruptible,
1170                 struct file *persistent_swap_storage,
1171                 size_t acc_size,
1172                 void (*destroy) (struct ttm_buffer_object *))
1173 {
1174         int ret = 0;
1175         unsigned long num_pages;
1176         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1177
1178         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1179         if (ret) {
1180                 pr_err("Out of kernel memory\n");
1181                 if (destroy)
1182                         (*destroy)(bo);
1183                 else
1184                         kfree(bo);
1185                 return -ENOMEM;
1186         }
1187
1188         size += buffer_start & ~PAGE_MASK;
1189         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1190         if (num_pages == 0) {
1191                 pr_err("Illegal buffer object size\n");
1192                 if (destroy)
1193                         (*destroy)(bo);
1194                 else
1195                         kfree(bo);
1196                 return -EINVAL;
1197         }
1198         bo->destroy = destroy;
1199
1200         kref_init(&bo->kref);
1201         kref_init(&bo->list_kref);
1202         atomic_set(&bo->cpu_writers, 0);
1203         atomic_set(&bo->reserved, 1);
1204         init_waitqueue_head(&bo->event_queue);
1205         INIT_LIST_HEAD(&bo->lru);
1206         INIT_LIST_HEAD(&bo->ddestroy);
1207         INIT_LIST_HEAD(&bo->swap);
1208         INIT_LIST_HEAD(&bo->io_reserve_lru);
1209         bo->bdev = bdev;
1210         bo->glob = bdev->glob;
1211         bo->type = type;
1212         bo->num_pages = num_pages;
1213         bo->mem.size = num_pages << PAGE_SHIFT;
1214         bo->mem.mem_type = TTM_PL_SYSTEM;
1215         bo->mem.num_pages = bo->num_pages;
1216         bo->mem.mm_node = NULL;
1217         bo->mem.page_alignment = page_alignment;
1218         bo->mem.bus.io_reserved_vm = false;
1219         bo->mem.bus.io_reserved_count = 0;
1220         bo->buffer_start = buffer_start & PAGE_MASK;
1221         bo->priv_flags = 0;
1222         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1223         bo->seq_valid = false;
1224         bo->persistent_swap_storage = persistent_swap_storage;
1225         bo->acc_size = acc_size;
1226         atomic_inc(&bo->glob->bo_count);
1227
1228         ret = ttm_bo_check_placement(bo, placement);
1229         if (unlikely(ret != 0))
1230                 goto out_err;
1231
1232         /*
1233          * For ttm_bo_type_device buffers, allocate
1234          * address space from the device.
1235          */
1236         if (bo->type == ttm_bo_type_device) {
1237                 ret = ttm_bo_setup_vm(bo);
1238                 if (ret)
1239                         goto out_err;
1240         }
1241
1242         ret = ttm_bo_validate(bo, placement, interruptible, false, false);
1243         if (ret)
1244                 goto out_err;
1245
1246         ttm_bo_unreserve(bo);
1247         return 0;
1248
1249 out_err:
1250         ttm_bo_unreserve(bo);
1251         ttm_bo_unref(&bo);
1252
1253         return ret;
1254 }
1255 EXPORT_SYMBOL(ttm_bo_init);
1256
1257 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1258                        unsigned long bo_size,
1259                        unsigned struct_size)
1260 {
1261         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1262         size_t size = 0;
1263
1264         size += ttm_round_pot(struct_size);
1265         size += PAGE_ALIGN(npages * sizeof(void *));
1266         size += ttm_round_pot(sizeof(struct ttm_tt));
1267         return size;
1268 }
1269 EXPORT_SYMBOL(ttm_bo_acc_size);
1270
1271 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1272                            unsigned long bo_size,
1273                            unsigned struct_size)
1274 {
1275         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1276         size_t size = 0;
1277
1278         size += ttm_round_pot(struct_size);
1279         size += PAGE_ALIGN(npages * sizeof(void *));
1280         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1281         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1282         return size;
1283 }
1284 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1285
1286 int ttm_bo_create(struct ttm_bo_device *bdev,
1287                         unsigned long size,
1288                         enum ttm_bo_type type,
1289                         struct ttm_placement *placement,
1290                         uint32_t page_alignment,
1291                         unsigned long buffer_start,
1292                         bool interruptible,
1293                         struct file *persistent_swap_storage,
1294                         struct ttm_buffer_object **p_bo)
1295 {
1296         struct ttm_buffer_object *bo;
1297         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1298         size_t acc_size;
1299         int ret;
1300
1301         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1302         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1303         if (unlikely(ret != 0))
1304                 return ret;
1305
1306         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1307
1308         if (unlikely(bo == NULL)) {
1309                 ttm_mem_global_free(mem_glob, acc_size);
1310                 return -ENOMEM;
1311         }
1312
1313         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1314                                 buffer_start, interruptible,
1315                                 persistent_swap_storage, acc_size, NULL);
1316         if (likely(ret == 0))
1317                 *p_bo = bo;
1318
1319         return ret;
1320 }
1321 EXPORT_SYMBOL(ttm_bo_create);
1322
1323 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1324                                         unsigned mem_type, bool allow_errors)
1325 {
1326         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1327         struct ttm_bo_global *glob = bdev->glob;
1328         int ret;
1329
1330         /*
1331          * Can't use standard list traversal since we're unlocking.
1332          */
1333
1334         spin_lock(&glob->lru_lock);
1335         while (!list_empty(&man->lru)) {
1336                 spin_unlock(&glob->lru_lock);
1337                 ret = ttm_mem_evict_first(bdev, mem_type, false, false, false);
1338                 if (ret) {
1339                         if (allow_errors) {
1340                                 return ret;
1341                         } else {
1342                                 pr_err("Cleanup eviction failed\n");
1343                         }
1344                 }
1345                 spin_lock(&glob->lru_lock);
1346         }
1347         spin_unlock(&glob->lru_lock);
1348         return 0;
1349 }
1350
1351 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1352 {
1353         struct ttm_mem_type_manager *man;
1354         int ret = -EINVAL;
1355
1356         if (mem_type >= TTM_NUM_MEM_TYPES) {
1357                 pr_err("Illegal memory type %d\n", mem_type);
1358                 return ret;
1359         }
1360         man = &bdev->man[mem_type];
1361
1362         if (!man->has_type) {
1363                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1364                        mem_type);
1365                 return ret;
1366         }
1367
1368         man->use_type = false;
1369         man->has_type = false;
1370
1371         ret = 0;
1372         if (mem_type > 0) {
1373                 ttm_bo_force_list_clean(bdev, mem_type, false);
1374
1375                 ret = (*man->func->takedown)(man);
1376         }
1377
1378         return ret;
1379 }
1380 EXPORT_SYMBOL(ttm_bo_clean_mm);
1381
1382 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1383 {
1384         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1385
1386         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1387                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1388                 return -EINVAL;
1389         }
1390
1391         if (!man->has_type) {
1392                 pr_err("Memory type %u has not been initialized\n", mem_type);
1393                 return 0;
1394         }
1395
1396         return ttm_bo_force_list_clean(bdev, mem_type, true);
1397 }
1398 EXPORT_SYMBOL(ttm_bo_evict_mm);
1399
1400 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1401                         unsigned long p_size)
1402 {
1403         int ret = -EINVAL;
1404         struct ttm_mem_type_manager *man;
1405
1406         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1407         man = &bdev->man[type];
1408         BUG_ON(man->has_type);
1409         man->io_reserve_fastpath = true;
1410         man->use_io_reserve_lru = false;
1411         mutex_init(&man->io_reserve_mutex);
1412         INIT_LIST_HEAD(&man->io_reserve_lru);
1413
1414         ret = bdev->driver->init_mem_type(bdev, type, man);
1415         if (ret)
1416                 return ret;
1417         man->bdev = bdev;
1418
1419         ret = 0;
1420         if (type != TTM_PL_SYSTEM) {
1421                 ret = (*man->func->init)(man, p_size);
1422                 if (ret)
1423                         return ret;
1424         }
1425         man->has_type = true;
1426         man->use_type = true;
1427         man->size = p_size;
1428
1429         INIT_LIST_HEAD(&man->lru);
1430
1431         return 0;
1432 }
1433 EXPORT_SYMBOL(ttm_bo_init_mm);
1434
1435 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1436 {
1437         struct ttm_bo_global *glob =
1438                 container_of(kobj, struct ttm_bo_global, kobj);
1439
1440         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1441         __free_page(glob->dummy_read_page);
1442         kfree(glob);
1443 }
1444
1445 void ttm_bo_global_release(struct drm_global_reference *ref)
1446 {
1447         struct ttm_bo_global *glob = ref->object;
1448
1449         kobject_del(&glob->kobj);
1450         kobject_put(&glob->kobj);
1451 }
1452 EXPORT_SYMBOL(ttm_bo_global_release);
1453
1454 int ttm_bo_global_init(struct drm_global_reference *ref)
1455 {
1456         struct ttm_bo_global_ref *bo_ref =
1457                 container_of(ref, struct ttm_bo_global_ref, ref);
1458         struct ttm_bo_global *glob = ref->object;
1459         int ret;
1460
1461         mutex_init(&glob->device_list_mutex);
1462         spin_lock_init(&glob->lru_lock);
1463         glob->mem_glob = bo_ref->mem_glob;
1464         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1465
1466         if (unlikely(glob->dummy_read_page == NULL)) {
1467                 ret = -ENOMEM;
1468                 goto out_no_drp;
1469         }
1470
1471         INIT_LIST_HEAD(&glob->swap_lru);
1472         INIT_LIST_HEAD(&glob->device_list);
1473
1474         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1475         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1476         if (unlikely(ret != 0)) {
1477                 pr_err("Could not register buffer object swapout\n");
1478                 goto out_no_shrink;
1479         }
1480
1481         atomic_set(&glob->bo_count, 0);
1482
1483         ret = kobject_init_and_add(
1484                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1485         if (unlikely(ret != 0))
1486                 kobject_put(&glob->kobj);
1487         return ret;
1488 out_no_shrink:
1489         __free_page(glob->dummy_read_page);
1490 out_no_drp:
1491         kfree(glob);
1492         return ret;
1493 }
1494 EXPORT_SYMBOL(ttm_bo_global_init);
1495
1496
1497 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1498 {
1499         int ret = 0;
1500         unsigned i = TTM_NUM_MEM_TYPES;
1501         struct ttm_mem_type_manager *man;
1502         struct ttm_bo_global *glob = bdev->glob;
1503
1504         while (i--) {
1505                 man = &bdev->man[i];
1506                 if (man->has_type) {
1507                         man->use_type = false;
1508                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1509                                 ret = -EBUSY;
1510                                 pr_err("DRM memory manager type %d is not clean\n",
1511                                        i);
1512                         }
1513                         man->has_type = false;
1514                 }
1515         }
1516
1517         mutex_lock(&glob->device_list_mutex);
1518         list_del(&bdev->device_list);
1519         mutex_unlock(&glob->device_list_mutex);
1520
1521         cancel_delayed_work_sync(&bdev->wq);
1522
1523         while (ttm_bo_delayed_delete(bdev, true))
1524                 ;
1525
1526         spin_lock(&glob->lru_lock);
1527         if (list_empty(&bdev->ddestroy))
1528                 TTM_DEBUG("Delayed destroy list was clean\n");
1529
1530         if (list_empty(&bdev->man[0].lru))
1531                 TTM_DEBUG("Swap list was clean\n");
1532         spin_unlock(&glob->lru_lock);
1533
1534         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1535         write_lock(&bdev->vm_lock);
1536         drm_mm_takedown(&bdev->addr_space_mm);
1537         write_unlock(&bdev->vm_lock);
1538
1539         return ret;
1540 }
1541 EXPORT_SYMBOL(ttm_bo_device_release);
1542
1543 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1544                        struct ttm_bo_global *glob,
1545                        struct ttm_bo_driver *driver,
1546                        uint64_t file_page_offset,
1547                        bool need_dma32)
1548 {
1549         int ret = -EINVAL;
1550
1551         rwlock_init(&bdev->vm_lock);
1552         bdev->driver = driver;
1553
1554         memset(bdev->man, 0, sizeof(bdev->man));
1555
1556         /*
1557          * Initialize the system memory buffer type.
1558          * Other types need to be driver / IOCTL initialized.
1559          */
1560         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1561         if (unlikely(ret != 0))
1562                 goto out_no_sys;
1563
1564         bdev->addr_space_rb = RB_ROOT;
1565         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1566         if (unlikely(ret != 0))
1567                 goto out_no_addr_mm;
1568
1569         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1570         bdev->nice_mode = true;
1571         INIT_LIST_HEAD(&bdev->ddestroy);
1572         bdev->dev_mapping = NULL;
1573         bdev->glob = glob;
1574         bdev->need_dma32 = need_dma32;
1575         bdev->val_seq = 0;
1576         spin_lock_init(&bdev->fence_lock);
1577         mutex_lock(&glob->device_list_mutex);
1578         list_add_tail(&bdev->device_list, &glob->device_list);
1579         mutex_unlock(&glob->device_list_mutex);
1580
1581         return 0;
1582 out_no_addr_mm:
1583         ttm_bo_clean_mm(bdev, 0);
1584 out_no_sys:
1585         return ret;
1586 }
1587 EXPORT_SYMBOL(ttm_bo_device_init);
1588
1589 /*
1590  * buffer object vm functions.
1591  */
1592
1593 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1594 {
1595         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1596
1597         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1598                 if (mem->mem_type == TTM_PL_SYSTEM)
1599                         return false;
1600
1601                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1602                         return false;
1603
1604                 if (mem->placement & TTM_PL_FLAG_CACHED)
1605                         return false;
1606         }
1607         return true;
1608 }
1609
1610 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1611 {
1612         struct ttm_bo_device *bdev = bo->bdev;
1613         loff_t offset = (loff_t) bo->addr_space_offset;
1614         loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
1615
1616         if (!bdev->dev_mapping)
1617                 return;
1618         unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1);
1619         ttm_mem_io_free_vm(bo);
1620 }
1621
1622 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1623 {
1624         struct ttm_bo_device *bdev = bo->bdev;
1625         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1626
1627         ttm_mem_io_lock(man, false);
1628         ttm_bo_unmap_virtual_locked(bo);
1629         ttm_mem_io_unlock(man);
1630 }
1631
1632
1633 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1634
1635 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1636 {
1637         struct ttm_bo_device *bdev = bo->bdev;
1638         struct rb_node **cur = &bdev->addr_space_rb.rb_node;
1639         struct rb_node *parent = NULL;
1640         struct ttm_buffer_object *cur_bo;
1641         unsigned long offset = bo->vm_node->start;
1642         unsigned long cur_offset;
1643
1644         while (*cur) {
1645                 parent = *cur;
1646                 cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb);
1647                 cur_offset = cur_bo->vm_node->start;
1648                 if (offset < cur_offset)
1649                         cur = &parent->rb_left;
1650                 else if (offset > cur_offset)
1651                         cur = &parent->rb_right;
1652                 else
1653                         BUG();
1654         }
1655
1656         rb_link_node(&bo->vm_rb, parent, cur);
1657         rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb);
1658 }
1659
1660 /**
1661  * ttm_bo_setup_vm:
1662  *
1663  * @bo: the buffer to allocate address space for
1664  *
1665  * Allocate address space in the drm device so that applications
1666  * can mmap the buffer and access the contents. This only
1667  * applies to ttm_bo_type_device objects as others are not
1668  * placed in the drm device address space.
1669  */
1670
1671 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1672 {
1673         struct ttm_bo_device *bdev = bo->bdev;
1674         int ret;
1675
1676 retry_pre_get:
1677         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1678         if (unlikely(ret != 0))
1679                 return ret;
1680
1681         write_lock(&bdev->vm_lock);
1682         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1683                                          bo->mem.num_pages, 0, 0);
1684
1685         if (unlikely(bo->vm_node == NULL)) {
1686                 ret = -ENOMEM;
1687                 goto out_unlock;
1688         }
1689
1690         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1691                                               bo->mem.num_pages, 0);
1692
1693         if (unlikely(bo->vm_node == NULL)) {
1694                 write_unlock(&bdev->vm_lock);
1695                 goto retry_pre_get;
1696         }
1697
1698         ttm_bo_vm_insert_rb(bo);
1699         write_unlock(&bdev->vm_lock);
1700         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1701
1702         return 0;
1703 out_unlock:
1704         write_unlock(&bdev->vm_lock);
1705         return ret;
1706 }
1707
1708 int ttm_bo_wait(struct ttm_buffer_object *bo,
1709                 bool lazy, bool interruptible, bool no_wait)
1710 {
1711         struct ttm_bo_driver *driver = bo->bdev->driver;
1712         struct ttm_bo_device *bdev = bo->bdev;
1713         void *sync_obj;
1714         void *sync_obj_arg;
1715         int ret = 0;
1716
1717         if (likely(bo->sync_obj == NULL))
1718                 return 0;
1719
1720         while (bo->sync_obj) {
1721
1722                 if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) {
1723                         void *tmp_obj = bo->sync_obj;
1724                         bo->sync_obj = NULL;
1725                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1726                         spin_unlock(&bdev->fence_lock);
1727                         driver->sync_obj_unref(&tmp_obj);
1728                         spin_lock(&bdev->fence_lock);
1729                         continue;
1730                 }
1731
1732                 if (no_wait)
1733                         return -EBUSY;
1734
1735                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1736                 sync_obj_arg = bo->sync_obj_arg;
1737                 spin_unlock(&bdev->fence_lock);
1738                 ret = driver->sync_obj_wait(sync_obj, sync_obj_arg,
1739                                             lazy, interruptible);
1740                 if (unlikely(ret != 0)) {
1741                         driver->sync_obj_unref(&sync_obj);
1742                         spin_lock(&bdev->fence_lock);
1743                         return ret;
1744                 }
1745                 spin_lock(&bdev->fence_lock);
1746                 if (likely(bo->sync_obj == sync_obj &&
1747                            bo->sync_obj_arg == sync_obj_arg)) {
1748                         void *tmp_obj = bo->sync_obj;
1749                         bo->sync_obj = NULL;
1750                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1751                                   &bo->priv_flags);
1752                         spin_unlock(&bdev->fence_lock);
1753                         driver->sync_obj_unref(&sync_obj);
1754                         driver->sync_obj_unref(&tmp_obj);
1755                         spin_lock(&bdev->fence_lock);
1756                 } else {
1757                         spin_unlock(&bdev->fence_lock);
1758                         driver->sync_obj_unref(&sync_obj);
1759                         spin_lock(&bdev->fence_lock);
1760                 }
1761         }
1762         return 0;
1763 }
1764 EXPORT_SYMBOL(ttm_bo_wait);
1765
1766 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1767 {
1768         struct ttm_bo_device *bdev = bo->bdev;
1769         int ret = 0;
1770
1771         /*
1772          * Using ttm_bo_reserve makes sure the lru lists are updated.
1773          */
1774
1775         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1776         if (unlikely(ret != 0))
1777                 return ret;
1778         spin_lock(&bdev->fence_lock);
1779         ret = ttm_bo_wait(bo, false, true, no_wait);
1780         spin_unlock(&bdev->fence_lock);
1781         if (likely(ret == 0))
1782                 atomic_inc(&bo->cpu_writers);
1783         ttm_bo_unreserve(bo);
1784         return ret;
1785 }
1786 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1787
1788 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1789 {
1790         if (atomic_dec_and_test(&bo->cpu_writers))
1791                 wake_up_all(&bo->event_queue);
1792 }
1793 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1794
1795 /**
1796  * A buffer object shrink method that tries to swap out the first
1797  * buffer object on the bo_global::swap_lru list.
1798  */
1799
1800 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1801 {
1802         struct ttm_bo_global *glob =
1803             container_of(shrink, struct ttm_bo_global, shrink);
1804         struct ttm_buffer_object *bo;
1805         int ret = -EBUSY;
1806         int put_count;
1807         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1808
1809         spin_lock(&glob->lru_lock);
1810         while (ret == -EBUSY) {
1811                 if (unlikely(list_empty(&glob->swap_lru))) {
1812                         spin_unlock(&glob->lru_lock);
1813                         return -EBUSY;
1814                 }
1815
1816                 bo = list_first_entry(&glob->swap_lru,
1817                                       struct ttm_buffer_object, swap);
1818                 kref_get(&bo->list_kref);
1819
1820                 if (!list_empty(&bo->ddestroy)) {
1821                         spin_unlock(&glob->lru_lock);
1822                         (void) ttm_bo_cleanup_refs(bo, false, false, false);
1823                         kref_put(&bo->list_kref, ttm_bo_release_list);
1824                         continue;
1825                 }
1826
1827                 /**
1828                  * Reserve buffer. Since we unlock while sleeping, we need
1829                  * to re-check that nobody removed us from the swap-list while
1830                  * we slept.
1831                  */
1832
1833                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
1834                 if (unlikely(ret == -EBUSY)) {
1835                         spin_unlock(&glob->lru_lock);
1836                         ttm_bo_wait_unreserved(bo, false);
1837                         kref_put(&bo->list_kref, ttm_bo_release_list);
1838                         spin_lock(&glob->lru_lock);
1839                 }
1840         }
1841
1842         BUG_ON(ret != 0);
1843         put_count = ttm_bo_del_from_lru(bo);
1844         spin_unlock(&glob->lru_lock);
1845
1846         ttm_bo_list_ref_sub(bo, put_count, true);
1847
1848         /**
1849          * Wait for GPU, then move to system cached.
1850          */
1851
1852         spin_lock(&bo->bdev->fence_lock);
1853         ret = ttm_bo_wait(bo, false, false, false);
1854         spin_unlock(&bo->bdev->fence_lock);
1855
1856         if (unlikely(ret != 0))
1857                 goto out;
1858
1859         if ((bo->mem.placement & swap_placement) != swap_placement) {
1860                 struct ttm_mem_reg evict_mem;
1861
1862                 evict_mem = bo->mem;
1863                 evict_mem.mm_node = NULL;
1864                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1865                 evict_mem.mem_type = TTM_PL_SYSTEM;
1866
1867                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1868                                              false, false, false);
1869                 if (unlikely(ret != 0))
1870                         goto out;
1871         }
1872
1873         ttm_bo_unmap_virtual(bo);
1874
1875         /**
1876          * Swap out. Buffer will be swapped in again as soon as
1877          * anyone tries to access a ttm page.
1878          */
1879
1880         if (bo->bdev->driver->swap_notify)
1881                 bo->bdev->driver->swap_notify(bo);
1882
1883         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1884 out:
1885
1886         /**
1887          *
1888          * Unreserve without putting on LRU to avoid swapping out an
1889          * already swapped buffer.
1890          */
1891
1892         atomic_set(&bo->reserved, 0);
1893         wake_up_all(&bo->event_queue);
1894         kref_put(&bo->list_kref, ttm_bo_release_list);
1895         return ret;
1896 }
1897
1898 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1899 {
1900         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1901                 ;
1902 }
1903 EXPORT_SYMBOL(ttm_bo_swapout_all);