sys/dev/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  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_bo.c 248060 2013-03-08 18:11:02Z dumbbell $
  31  */
  32
  33 #define pr_fmt(fmt) "[TTM] " fmt
  34
  35 #include <drm/ttm/ttm_module.h>
  36 #include <drm/ttm/ttm_bo_driver.h>
  37 #include <drm/ttm/ttm_placement.h>
  38 #include <linux/atomic.h>
  39 #include <linux/export.h>
  40 #include <linux/wait.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 ttm_bo_global *glob);
  49
  50 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  51 {
  52         int i;
  53
  54         for (i = 0; i <= TTM_PL_PRIV5; i++)
  55                 if (flags & (1 << i)) {
  56                         *mem_type = i;
  57                         return 0;
  58                 }
  59         return -EINVAL;
  60 }
  61
  62 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  63 {
  64         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  65
  66         kprintf("    has_type: %d\n", man->has_type);
  67         kprintf("    use_type: %d\n", man->use_type);
  68         kprintf("    flags: 0x%08X\n", man->flags);
  69         kprintf("    gpu_offset: 0x%08lX\n", man->gpu_offset);
  70         kprintf("    size: %ju\n", (uintmax_t)man->size);
  71         kprintf("    available_caching: 0x%08X\n", man->available_caching);
  72         kprintf("    default_caching: 0x%08X\n", man->default_caching);
  73         if (mem_type != TTM_PL_SYSTEM)
  74                 (*man->func->debug)(man, TTM_PFX);
  75 }
  76
  77 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  78                                         struct ttm_placement *placement)
  79 {
  80         int i, ret, mem_type;
  81
  82         kprintf("No space for %p (%lu pages, %luK, %luM)\n",
  83                bo, bo->mem.num_pages, bo->mem.size >> 10,
  84                bo->mem.size >> 20);
  85         for (i = 0; i < placement->num_placement; i++) {
  86                 ret = ttm_mem_type_from_flags(placement->placement[i],
  87                                                 &mem_type);
  88                 if (ret)
  89                         return;
  90                 kprintf("  placement[%d]=0x%08X (%d)\n",
  91                        i, placement->placement[i], mem_type);
  92                 ttm_mem_type_debug(bo->bdev, mem_type);
  93         }
  94 }
  95
  96 #if 0
  97 static ssize_t ttm_bo_global_show(struct ttm_bo_global *glob,
  98     char *buffer)
  99 {
 100
 101         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 102                         (unsigned long) atomic_read(&glob->bo_count));
 103 }
 104 #endif
 105
 106 static inline uint32_t ttm_bo_type_flags(unsigned type)
 107 {
 108         return 1 << (type);
 109 }
 110
 111 static void ttm_bo_release_list(struct kref *list_kref)
 112 {
 113         struct ttm_buffer_object *bo =
 114             container_of(list_kref, struct ttm_buffer_object, list_kref);
 115         struct ttm_bo_device *bdev = bo->bdev;
 116         size_t acc_size = bo->acc_size;
 117
 118         BUG_ON(atomic_read(&bo->list_kref.refcount));
 119         BUG_ON(atomic_read(&bo->kref.refcount));
 120         BUG_ON(atomic_read(&bo->cpu_writers));
 121         BUG_ON(bo->sync_obj != NULL);
 122         BUG_ON(bo->mem.mm_node != NULL);
 123         BUG_ON(!list_empty(&bo->lru));
 124         BUG_ON(!list_empty(&bo->ddestroy));
 125
 126         if (bo->ttm)
 127                 ttm_tt_destroy(bo->ttm);
 128         atomic_dec(&bo->glob->bo_count);
 129         if (bo->destroy)
 130                 bo->destroy(bo);
 131         else {
 132                 kfree(bo, M_DRM);
 133         }
 134         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 135 }
 136
 137 static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
 138                                   bool interruptible)
 139 {
 140         if (interruptible) {
 141                 return wait_event_interruptible(bo->event_queue,
 142                                                !ttm_bo_is_reserved(bo));
 143         } else {
 144                 wait_event(bo->event_queue, !ttm_bo_is_reserved(bo));
 145                 return 0;
 146         }
 147 }
 148
 149 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 150 {
 151         struct ttm_bo_device *bdev = bo->bdev;
 152         struct ttm_mem_type_manager *man;
 153
 154         BUG_ON(!ttm_bo_is_reserved(bo));
 155
 156         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 157
 158                 BUG_ON(!list_empty(&bo->lru));
 159
 160                 man = &bdev->man[bo->mem.mem_type];
 161                 list_add_tail(&bo->lru, &man->lru);
 162                 kref_get(&bo->list_kref);
 163
 164                 if (bo->ttm != NULL) {
 165                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 166                         kref_get(&bo->list_kref);
 167                 }
 168         }
 169 }
 170
 171 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 172 {
 173         int put_count = 0;
 174
 175         if (!list_empty(&bo->swap)) {
 176                 list_del_init(&bo->swap);
 177                 ++put_count;
 178         }
 179         if (!list_empty(&bo->lru)) {
 180                 list_del_init(&bo->lru);
 181                 ++put_count;
 182         }
 183
 184         /*
 185          * TODO: Add a driver hook to delete from
 186          * driver-specific LRU's here.
 187          */
 188
 189         return put_count;
 190 }
 191
 192 int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
 193                           bool interruptible,
 194                           bool no_wait, bool use_sequence, uint32_t sequence)
 195 {
 196         int ret;
 197
 198         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 199                 /**
 200                  * Deadlock avoidance for multi-bo reserving.
 201                  */
 202                 if (use_sequence && bo->seq_valid) {
 203                         /**
 204                          * We've already reserved this one.
 205                          */
 206                         if (unlikely(sequence == bo->val_seq))
 207                                 return -EDEADLK;
 208                         /**
 209                          * Already reserved by a thread that will not back
 210                          * off for us. We need to back off.
 211                          */
 212                         if (unlikely(sequence - bo->val_seq < (1U << 31)))
 213                                 return -EAGAIN;
 214                 }
 215
 216                 if (no_wait)
 217                         return -EBUSY;
 218
 219                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 220
 221                 if (unlikely(ret))
 222                         return ret;
 223         }
 224
 225         if (use_sequence) {
 226                 bool wake_up = false;
 227                 /**
 228                  * Wake up waiters that may need to recheck for deadlock,
 229                  * if we decreased the sequence number.
 230                  */
 231                 if (unlikely((bo->val_seq - sequence < (1U << 31))
 232                              || !bo->seq_valid))
 233                         wake_up = true;
 234
 235                 /*
 236                  * In the worst case with memory ordering these values can be
 237                  * seen in the wrong order. However since we call wake_up_all
 238                  * in that case, this will hopefully not pose a problem,
 239                  * and the worst case would only cause someone to accidentally
 240                  * hit -EAGAIN in ttm_bo_reserve when they see old value of
 241                  * val_seq. However this would only happen if seq_valid was
 242                  * written before val_seq was, and just means some slightly
 243                  * increased cpu usage
 244                  */
 245                 bo->val_seq = sequence;
 246                 bo->seq_valid = true;
 247                 if (wake_up)
 248                         wake_up_all(&bo->event_queue);
 249         } else {
 250                 bo->seq_valid = false;
 251         }
 252
 253         return 0;
 254 }
 255 EXPORT_SYMBOL(ttm_bo_reserve);
 256
 257 static void ttm_bo_ref_bug(struct kref *list_kref)
 258 {
 259         BUG();
 260 }
 261
 262 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 263                          bool never_free)
 264 {
 265         kref_sub(&bo->list_kref, count,
 266                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 267 }
 268
 269 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 270                    bool interruptible,
 271                    bool no_wait, bool use_sequence, uint32_t sequence)
 272 {
 273         struct ttm_bo_global *glob = bo->glob;
 274         int put_count = 0;
 275         int ret;
 276
 277         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 278         ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_sequence,
 279                                    sequence);
 280         if (likely(ret == 0)) {
 281                 put_count = ttm_bo_del_from_lru(bo);
 282                 lockmgr(&glob->lru_lock, LK_RELEASE);
 283                 ttm_bo_list_ref_sub(bo, put_count, true);
 284         } else {
 285                 lockmgr(&glob->lru_lock, LK_RELEASE);
 286         }
 287
 288
 289         return ret;
 290 }
 291
 292 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
 293                                   bool interruptible, uint32_t sequence)
 294 {
 295         bool wake_up = false;
 296         int ret;
 297
 298         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 299                 WARN_ON(bo->seq_valid && sequence == bo->val_seq);
 300
 301                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 302
 303                 if (unlikely(ret))
 304                         return ret;
 305         }
 306
 307         if ((bo->val_seq - sequence < (1U << 31)) || !bo->seq_valid)
 308                 wake_up = true;
 309
 310         /**
 311          * Wake up waiters that may need to recheck for deadlock,
 312          * if we decreased the sequence number.
 313          */
 314         bo->val_seq = sequence;
 315         bo->seq_valid = true;
 316         if (wake_up)
 317                 wake_up_all(&bo->event_queue);
 318
 319         return 0;
 320 }
 321
 322 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 323                             bool interruptible, uint32_t sequence)
 324 {
 325         struct ttm_bo_global *glob = bo->glob;
 326         int put_count, ret;
 327
 328         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 329         ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, sequence);
 330         if (likely(!ret)) {
 331                 put_count = ttm_bo_del_from_lru(bo);
 332                 lockmgr(&glob->lru_lock, LK_RELEASE);
 333                 ttm_bo_list_ref_sub(bo, put_count, true);
 334         } else {
 335                 lockmgr(&glob->lru_lock, LK_RELEASE);
 336         }
 337         return ret;
 338 }
 339 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
 340
 341 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
 342 {
 343         ttm_bo_add_to_lru(bo);
 344         atomic_set(&bo->reserved, 0);
 345         wake_up_all(&bo->event_queue);
 346 }
 347
 348 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 349 {
 350         struct ttm_bo_global *glob = bo->glob;
 351
 352         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 353         ttm_bo_unreserve_locked(bo);
 354         lockmgr(&glob->lru_lock, LK_RELEASE);
 355 }
 356 EXPORT_SYMBOL(ttm_bo_unreserve);
 357
 358 /*
 359  * Call bo->mutex locked.
 360  */
 361 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 362 {
 363         struct ttm_bo_device *bdev = bo->bdev;
 364         struct ttm_bo_global *glob = bo->glob;
 365         int ret = 0;
 366         uint32_t page_flags = 0;
 367
 368         TTM_ASSERT_LOCKED(&bo->mutex);
 369         bo->ttm = NULL;
 370
 371         if (bdev->need_dma32)
 372                 page_flags |= TTM_PAGE_FLAG_DMA32;
 373
 374         switch (bo->type) {
 375         case ttm_bo_type_device:
 376                 if (zero_alloc)
 377                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 378         case ttm_bo_type_kernel:
 379                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 380                                                       page_flags, glob->dummy_read_page);
 381                 if (unlikely(bo->ttm == NULL))
 382                         ret = -ENOMEM;
 383                 break;
 384         case ttm_bo_type_sg:
 385                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 386                                                       page_flags | TTM_PAGE_FLAG_SG,
 387                                                       glob->dummy_read_page);
 388                 if (unlikely(bo->ttm == NULL)) {
 389                         ret = -ENOMEM;
 390                         break;
 391                 }
 392                 bo->ttm->sg = bo->sg;
 393                 break;
 394         default:
 395                 kprintf("[TTM] Illegal buffer object type\n");
 396                 ret = -EINVAL;
 397                 break;
 398         }
 399
 400         return ret;
 401 }
 402
 403 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 404                                   struct ttm_mem_reg *mem,
 405                                   bool evict, bool interruptible,
 406                                   bool no_wait_gpu)
 407 {
 408         struct ttm_bo_device *bdev = bo->bdev;
 409         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 410         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 411         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 412         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 413         int ret = 0;
 414
 415         if (old_is_pci || new_is_pci ||
 416             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 417                 ret = ttm_mem_io_lock(old_man, true);
 418                 if (unlikely(ret != 0))
 419                         goto out_err;
 420                 ttm_bo_unmap_virtual_locked(bo);
 421                 ttm_mem_io_unlock(old_man);
 422         }
 423
 424         /*
 425          * Create and bind a ttm if required.
 426          */
 427
 428         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 429                 if (bo->ttm == NULL) {
 430                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 431                         ret = ttm_bo_add_ttm(bo, zero);
 432                         if (ret)
 433                                 goto out_err;
 434                 }
 435
 436                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 437                 if (ret)
 438                         goto out_err;
 439
 440                 if (mem->mem_type != TTM_PL_SYSTEM) {
 441                         ret = ttm_tt_bind(bo->ttm, mem);
 442                         if (ret)
 443                                 goto out_err;
 444                 }
 445
 446                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 447                         if (bdev->driver->move_notify)
 448                                 bdev->driver->move_notify(bo, mem);
 449                         bo->mem = *mem;
 450                         mem->mm_node = NULL;
 451                         goto moved;
 452                 }
 453         }
 454
 455         if (bdev->driver->move_notify)
 456                 bdev->driver->move_notify(bo, mem);
 457
 458         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 459             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 460                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 461         else if (bdev->driver->move)
 462                 ret = bdev->driver->move(bo, evict, interruptible,
 463                                          no_wait_gpu, mem);
 464         else
 465                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 466
 467         if (ret) {
 468                 if (bdev->driver->move_notify) {
 469                         struct ttm_mem_reg tmp_mem = *mem;
 470                         *mem = bo->mem;
 471                         bo->mem = tmp_mem;
 472                         bdev->driver->move_notify(bo, mem);
 473                         bo->mem = *mem;
 474                         *mem = tmp_mem;
 475                 }
 476
 477                 goto out_err;
 478         }
 479
 480 moved:
 481         if (bo->evicted) {
 482                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 483                 if (ret)
 484                         kprintf("[TTM] Can not flush read caches\n");
 485                 bo->evicted = false;
 486         }
 487
 488         if (bo->mem.mm_node) {
 489                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 490                     bdev->man[bo->mem.mem_type].gpu_offset;
 491                 bo->cur_placement = bo->mem.placement;
 492         } else
 493                 bo->offset = 0;
 494
 495         return 0;
 496
 497 out_err:
 498         new_man = &bdev->man[bo->mem.mem_type];
 499         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 500                 ttm_tt_unbind(bo->ttm);
 501                 ttm_tt_destroy(bo->ttm);
 502                 bo->ttm = NULL;
 503         }
 504
 505         return ret;
 506 }
 507
 508 /**
 509  * Call bo::reserved.
 510  * Will release GPU memory type usage on destruction.
 511  * This is the place to put in driver specific hooks to release
 512  * driver private resources.
 513  * Will release the bo::reserved lock.
 514  */
 515
 516 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 517 {
 518         if (bo->bdev->driver->move_notify)
 519                 bo->bdev->driver->move_notify(bo, NULL);
 520
 521         if (bo->ttm) {
 522                 ttm_tt_unbind(bo->ttm);
 523                 ttm_tt_destroy(bo->ttm);
 524                 bo->ttm = NULL;
 525         }
 526         ttm_bo_mem_put(bo, &bo->mem);
 527
 528         atomic_set(&bo->reserved, 0);
 529         wake_up_all(&bo->event_queue);
 530
 531         /*
 532          * Since the final reference to this bo may not be dropped by
 533          * the current task we have to put a memory barrier here to make
 534          * sure the changes done in this function are always visible.
 535          *
 536          * This function only needs protection against the final kref_put.
 537          */
 538         cpu_mfence();
 539 }
 540
 541 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 542 {
 543         struct ttm_bo_device *bdev = bo->bdev;
 544         struct ttm_bo_global *glob = bo->glob;
 545         struct ttm_bo_driver *driver = bdev->driver;
 546         void *sync_obj = NULL;
 547         int put_count;
 548         int ret;
 549
 550         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 551         ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 552
 553         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 554         (void) ttm_bo_wait(bo, false, false, true);
 555         if (!ret && !bo->sync_obj) {
 556                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 557                 put_count = ttm_bo_del_from_lru(bo);
 558
 559                 lockmgr(&glob->lru_lock, LK_RELEASE);
 560                 ttm_bo_cleanup_memtype_use(bo);
 561
 562                 ttm_bo_list_ref_sub(bo, put_count, true);
 563
 564                 return;
 565         }
 566         if (bo->sync_obj)
 567                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 568         lockmgr(&bdev->fence_lock, LK_RELEASE);
 569
 570         if (!ret) {
 571                 atomic_set(&bo->reserved, 0);
 572                 wake_up_all(&bo->event_queue);
 573         }
 574
 575         kref_get(&bo->list_kref);
 576         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 577         lockmgr(&glob->lru_lock, LK_RELEASE);
 578
 579         if (sync_obj) {
 580                 driver->sync_obj_flush(sync_obj);
 581                 driver->sync_obj_unref(&sync_obj);
 582         }
 583         schedule_delayed_work(&bdev->wq,
 584                               ((hz / 100) < 1) ? 1 : hz / 100);
 585 }
 586
 587 /**
 588  * function ttm_bo_cleanup_refs_and_unlock
 589  * If bo idle, remove from delayed- and lru lists, and unref.
 590  * If not idle, do nothing.
 591  *
 592  * Must be called with lru_lock and reservation held, this function
 593  * will drop both before returning.
 594  *
 595  * @interruptible         Any sleeps should occur interruptibly.
 596  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 597  */
 598
 599 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 600                                           bool interruptible,
 601                                           bool no_wait_gpu)
 602 {
 603         struct ttm_bo_device *bdev = bo->bdev;
 604         struct ttm_bo_driver *driver = bdev->driver;
 605         struct ttm_bo_global *glob = bo->glob;
 606         int put_count;
 607         int ret;
 608
 609         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 610         ret = ttm_bo_wait(bo, false, false, true);
 611
 612         if (ret && !no_wait_gpu) {
 613                 void *sync_obj;
 614
 615                 /*
 616                  * Take a reference to the fence and unreserve,
 617                  * at this point the buffer should be dead, so
 618                  * no new sync objects can be attached.
 619                  */
 620                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 621                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 622
 623                 atomic_set(&bo->reserved, 0);
 624                 wake_up_all(&bo->event_queue);
 625                 lockmgr(&glob->lru_lock, LK_RELEASE);
 626
 627                 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
 628                 driver->sync_obj_unref(&sync_obj);
 629                 if (ret)
 630                         return ret;
 631
 632                 /*
 633                  * remove sync_obj with ttm_bo_wait, the wait should be
 634                  * finished, and no new wait object should have been added.
 635                  */
 636                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 637                 ret = ttm_bo_wait(bo, false, false, true);
 638                 WARN_ON(ret);
 639                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 640                 if (ret)
 641                         return ret;
 642
 643                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 644                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 645
 646                 /*
 647                  * We raced, and lost, someone else holds the reservation now,
 648                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 649                  *
 650                  * Even if it's not the case, because we finished waiting any
 651                  * delayed destruction would succeed, so just return success
 652                  * here.
 653                  */
 654                 if (ret) {
 655                         lockmgr(&glob->lru_lock, LK_RELEASE);
 656                         return 0;
 657                 }
 658         } else
 659                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 660
 661         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 662                 atomic_set(&bo->reserved, 0);
 663                 wake_up_all(&bo->event_queue);
 664                 lockmgr(&glob->lru_lock, LK_RELEASE);
 665                 return ret;
 666         }
 667
 668         put_count = ttm_bo_del_from_lru(bo);
 669         list_del_init(&bo->ddestroy);
 670         ++put_count;
 671
 672         lockmgr(&glob->lru_lock, LK_RELEASE);
 673         ttm_bo_cleanup_memtype_use(bo);
 674
 675         ttm_bo_list_ref_sub(bo, put_count, true);
 676
 677         return 0;
 678 }
 679
 680 /**
 681  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 682  * encountered buffers.
 683  */
 684
 685 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 686 {
 687         struct ttm_bo_global *glob = bdev->glob;
 688         struct ttm_buffer_object *entry = NULL;
 689         int ret = 0;
 690
 691         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 692         if (list_empty(&bdev->ddestroy))
 693                 goto out_unlock;
 694
 695         entry = list_first_entry(&bdev->ddestroy,
 696                 struct ttm_buffer_object, ddestroy);
 697         kref_get(&entry->list_kref);
 698
 699         for (;;) {
 700                 struct ttm_buffer_object *nentry = NULL;
 701
 702                 if (entry->ddestroy.next != &bdev->ddestroy) {
 703                         nentry = list_first_entry(&entry->ddestroy,
 704                                 struct ttm_buffer_object, ddestroy);
 705                         kref_get(&nentry->list_kref);
 706                 }
 707
 708                 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
 709                 if (remove_all && ret) {
 710                         ret = ttm_bo_reserve_nolru(entry, false, false,
 711                                                    false, 0);
 712                 }
 713
 714                 if (!ret)
 715                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 716                                                              !remove_all);
 717                 else
 718                         lockmgr(&glob->lru_lock, LK_RELEASE);
 719
 720                 kref_put(&entry->list_kref, ttm_bo_release_list);
 721                 entry = nentry;
 722
 723                 if (ret || !entry)
 724                         goto out;
 725
 726                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 727                 if (list_empty(&entry->ddestroy))
 728                         break;
 729         }
 730
 731 out_unlock:
 732         lockmgr(&glob->lru_lock, LK_RELEASE);
 733 out:
 734         if (entry)
 735                 kref_put(&entry->list_kref, ttm_bo_release_list);
 736         return ret;
 737 }
 738
 739 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 740 {
 741         struct ttm_bo_device *bdev =
 742             container_of(work, struct ttm_bo_device, wq.work);
 743
 744         if (ttm_bo_delayed_delete(bdev, false)) {
 745                 schedule_delayed_work(&bdev->wq,
 746                                       ((hz / 100) < 1) ? 1 : hz / 100);
 747         }
 748 }
 749
 750 /*
 751  * NOTE: bdev->vm_lock already held on call, this function release it.
 752  */
 753 static void ttm_bo_release(struct kref *kref)
 754 {
 755         struct ttm_buffer_object *bo =
 756             container_of(kref, struct ttm_buffer_object, kref);
 757         struct ttm_bo_device *bdev = bo->bdev;
 758         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 759         int release_active;
 760
 761         if (atomic_read(&bo->kref.refcount) > 0) {
 762                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 763                 return;
 764         }
 765         if (likely(bo->vm_node != NULL)) {
 766                 RB_REMOVE(ttm_bo_device_buffer_objects,
 767                                 &bdev->addr_space_rb, bo);
 768                 drm_mm_put_block(bo->vm_node);
 769                 bo->vm_node = NULL;
 770         }
 771
 772         /*
 773          * Should we clean up our implied list_kref?  Because ttm_bo_release()
 774          * can be called reentrantly due to races (this may not be true any
 775          * more with the lock management changes in the deref), it is possible
 776          * to get here twice, but there's only one list_kref ref to drop and
 777          * in the other path 'bo' can be kfree()d by another thread the
 778          * instant we release our lock.
 779          */
 780         release_active = test_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 781         if (release_active) {
 782                 clear_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 783                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 784                 ttm_mem_io_lock(man, false);
 785                 ttm_mem_io_free_vm(bo);
 786                 ttm_mem_io_unlock(man);
 787                 ttm_bo_cleanup_refs_or_queue(bo);
 788                 kref_put(&bo->list_kref, ttm_bo_release_list);
 789         } else {
 790                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 791         }
 792 }
 793
 794 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 795 {
 796         struct ttm_buffer_object *bo = *p_bo;
 797         struct ttm_bo_device *bdev = bo->bdev;
 798
 799         *p_bo = NULL;
 800         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
 801         if (kref_put(&bo->kref, ttm_bo_release) == 0)
 802                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 803 }
 804 EXPORT_SYMBOL(ttm_bo_unref);
 805
 806 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 807 {
 808         return cancel_delayed_work_sync(&bdev->wq);
 809 }
 810 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 811
 812 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 813 {
 814         if (resched)
 815                 schedule_delayed_work(&bdev->wq,
 816                                       ((hz / 100) < 1) ? 1 : hz / 100);
 817 }
 818 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 819
 820 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 821                         bool no_wait_gpu)
 822 {
 823         struct ttm_bo_device *bdev = bo->bdev;
 824         struct ttm_mem_reg evict_mem;
 825         struct ttm_placement placement;
 826         int ret = 0;
 827
 828         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 829         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 830         lockmgr(&bdev->fence_lock, LK_RELEASE);
 831
 832         if (unlikely(ret != 0)) {
 833                 if (ret != -ERESTART) {
 834                         kprintf("[TTM] Failed to expire sync object before buffer eviction\n");
 835                 }
 836                 goto out;
 837         }
 838
 839         BUG_ON(!ttm_bo_is_reserved(bo));
 840
 841         evict_mem = bo->mem;
 842         evict_mem.mm_node = NULL;
 843         evict_mem.bus.io_reserved_vm = false;
 844         evict_mem.bus.io_reserved_count = 0;
 845
 846         placement.fpfn = 0;
 847         placement.lpfn = 0;
 848         placement.num_placement = 0;
 849         placement.num_busy_placement = 0;
 850         bdev->driver->evict_flags(bo, &placement);
 851         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 852                                 no_wait_gpu);
 853         if (ret) {
 854                 if (ret != -ERESTART) {
 855                         kprintf("[TTM] Failed to find memory space for buffer 0x%p eviction\n",
 856                                bo);
 857                         ttm_bo_mem_space_debug(bo, &placement);
 858                 }
 859                 goto out;
 860         }
 861
 862         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 863                                      no_wait_gpu);
 864         if (ret) {
 865                 if (ret != -ERESTART)
 866                         kprintf("[TTM] Buffer eviction failed\n");
 867                 ttm_bo_mem_put(bo, &evict_mem);
 868                 goto out;
 869         }
 870         bo->evicted = true;
 871 out:
 872         return ret;
 873 }
 874
 875 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 876                                 uint32_t mem_type,
 877                                 bool interruptible,
 878                                 bool no_wait_gpu)
 879 {
 880         struct ttm_bo_global *glob = bdev->glob;
 881         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 882         struct ttm_buffer_object *bo;
 883         int ret = -EBUSY, put_count;
 884
 885         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 886         list_for_each_entry(bo, &man->lru, lru) {
 887                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 888                 if (!ret)
 889                         break;
 890         }
 891
 892         if (ret) {
 893                 lockmgr(&glob->lru_lock, LK_RELEASE);
 894                 return ret;
 895         }
 896
 897         kref_get(&bo->list_kref);
 898
 899         if (!list_empty(&bo->ddestroy)) {
 900                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 901                                                      no_wait_gpu);
 902                 kref_put(&bo->list_kref, ttm_bo_release_list);
 903                 return ret;
 904         }
 905
 906         put_count = ttm_bo_del_from_lru(bo);
 907         lockmgr(&glob->lru_lock, LK_RELEASE);
 908
 909         BUG_ON(ret != 0);
 910
 911         ttm_bo_list_ref_sub(bo, put_count, true);
 912
 913         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 914         ttm_bo_unreserve(bo);
 915
 916         kref_put(&bo->list_kref, ttm_bo_release_list);
 917         return ret;
 918 }
 919
 920 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 921 {
 922         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 923
 924         if (mem->mm_node)
 925                 (*man->func->put_node)(man, mem);
 926 }
 927 EXPORT_SYMBOL(ttm_bo_mem_put);
 928
 929 /**
 930  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 931  * space, or we've evicted everything and there isn't enough space.
 932  */
 933 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 934                                         uint32_t mem_type,
 935                                         struct ttm_placement *placement,
 936                                         struct ttm_mem_reg *mem,
 937                                         bool interruptible,
 938                                         bool no_wait_gpu)
 939 {
 940         struct ttm_bo_device *bdev = bo->bdev;
 941         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 942         int ret;
 943
 944         do {
 945                 ret = (*man->func->get_node)(man, bo, placement, mem);
 946                 if (unlikely(ret != 0))
 947                         return ret;
 948                 if (mem->mm_node)
 949                         break;
 950                 ret = ttm_mem_evict_first(bdev, mem_type,
 951                                           interruptible, no_wait_gpu);
 952                 if (unlikely(ret != 0))
 953                         return ret;
 954         } while (1);
 955         if (mem->mm_node == NULL)
 956                 return -ENOMEM;
 957         mem->mem_type = mem_type;
 958         return 0;
 959 }
 960
 961 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 962                                       uint32_t cur_placement,
 963                                       uint32_t proposed_placement)
 964 {
 965         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 966         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 967
 968         /**
 969          * Keep current caching if possible.
 970          */
 971
 972         if ((cur_placement & caching) != 0)
 973                 result |= (cur_placement & caching);
 974         else if ((man->default_caching & caching) != 0)
 975                 result |= man->default_caching;
 976         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 977                 result |= TTM_PL_FLAG_CACHED;
 978         else if ((TTM_PL_FLAG_WC & caching) != 0)
 979                 result |= TTM_PL_FLAG_WC;
 980         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 981                 result |= TTM_PL_FLAG_UNCACHED;
 982
 983         return result;
 984 }
 985
 986 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 987                                  uint32_t mem_type,
 988                                  uint32_t proposed_placement,
 989                                  uint32_t *masked_placement)
 990 {
 991         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 992
 993         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 994                 return false;
 995
 996         if ((proposed_placement & man->available_caching) == 0)
 997                 return false;
 998
 999         cur_flags |= (proposed_placement & man->available_caching);
1000
1001         *masked_placement = cur_flags;
1002         return true;
1003 }
1004
1005 /**
1006  * Creates space for memory region @mem according to its type.
1007  *
1008  * This function first searches for free space in compatible memory types in
1009  * the priority order defined by the driver.  If free space isn't found, then
1010  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1011  * space.
1012  */
1013 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1014                         struct ttm_placement *placement,
1015                         struct ttm_mem_reg *mem,
1016                         bool interruptible,
1017                         bool no_wait_gpu)
1018 {
1019         struct ttm_bo_device *bdev = bo->bdev;
1020         struct ttm_mem_type_manager *man;
1021         uint32_t mem_type = TTM_PL_SYSTEM;
1022         uint32_t cur_flags = 0;
1023         bool type_found = false;
1024         bool type_ok = false;
1025         bool has_erestartsys = false;
1026         int i, ret;
1027
1028         mem->mm_node = NULL;
1029         for (i = 0; i < placement->num_placement; ++i) {
1030                 ret = ttm_mem_type_from_flags(placement->placement[i],
1031                                                 &mem_type);
1032                 if (ret)
1033                         return ret;
1034                 man = &bdev->man[mem_type];
1035
1036                 type_ok = ttm_bo_mt_compatible(man,
1037                                                 mem_type,
1038                                                 placement->placement[i],
1039                                                 &cur_flags);
1040
1041                 if (!type_ok)
1042                         continue;
1043
1044                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1045                                                   cur_flags);
1046                 /*
1047                  * Use the access and other non-mapping-related flag bits from
1048                  * the memory placement flags to the current flags
1049                  */
1050                 ttm_flag_masked(&cur_flags, placement->placement[i],
1051                                 ~TTM_PL_MASK_MEMTYPE);
1052
1053                 if (mem_type == TTM_PL_SYSTEM)
1054                         break;
1055
1056                 if (man->has_type && man->use_type) {
1057                         type_found = true;
1058                         ret = (*man->func->get_node)(man, bo, placement, mem);
1059                         if (unlikely(ret))
1060                                 return ret;
1061                 }
1062                 if (mem->mm_node)
1063                         break;
1064         }
1065
1066         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1067                 mem->mem_type = mem_type;
1068                 mem->placement = cur_flags;
1069                 return 0;
1070         }
1071
1072         if (!type_found)
1073                 return -EINVAL;
1074
1075         for (i = 0; i < placement->num_busy_placement; ++i) {
1076                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1077                                                 &mem_type);
1078                 if (ret)
1079                         return ret;
1080                 man = &bdev->man[mem_type];
1081                 if (!man->has_type)
1082                         continue;
1083                 if (!ttm_bo_mt_compatible(man,
1084                                                 mem_type,
1085                                                 placement->busy_placement[i],
1086                                                 &cur_flags))
1087                         continue;
1088
1089                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1090                                                   cur_flags);
1091                 /*
1092                  * Use the access and other non-mapping-related flag bits from
1093                  * the memory placement flags to the current flags
1094                  */
1095                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1096                                 ~TTM_PL_MASK_MEMTYPE);
1097
1098
1099                 if (mem_type == TTM_PL_SYSTEM) {
1100                         mem->mem_type = mem_type;
1101                         mem->placement = cur_flags;
1102                         mem->mm_node = NULL;
1103                         return 0;
1104                 }
1105
1106                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1107                                                 interruptible, no_wait_gpu);
1108                 if (ret == 0 && mem->mm_node) {
1109                         mem->placement = cur_flags;
1110                         return 0;
1111                 }
1112                 if (ret == -ERESTART)
1113                         has_erestartsys = true;
1114         }
1115         ret = (has_erestartsys) ? -ERESTART : -ENOMEM;
1116         return ret;
1117 }
1118 EXPORT_SYMBOL(ttm_bo_mem_space);
1119
1120 static
1121 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1122                         struct ttm_placement *placement,
1123                         bool interruptible,
1124                         bool no_wait_gpu)
1125 {
1126         int ret = 0;
1127         struct ttm_mem_reg mem;
1128         struct ttm_bo_device *bdev = bo->bdev;
1129
1130         BUG_ON(!ttm_bo_is_reserved(bo));
1131
1132         /*
1133          * FIXME: It's possible to pipeline buffer moves.
1134          * Have the driver move function wait for idle when necessary,
1135          * instead of doing it here.
1136          */
1137         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1138         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1139         lockmgr(&bdev->fence_lock, LK_RELEASE);
1140         if (ret)
1141                 return ret;
1142         mem.num_pages = bo->num_pages;
1143         mem.size = mem.num_pages << PAGE_SHIFT;
1144         mem.page_alignment = bo->mem.page_alignment;
1145         mem.bus.io_reserved_vm = false;
1146         mem.bus.io_reserved_count = 0;
1147         /*
1148          * Determine where to move the buffer.
1149          */
1150         ret = ttm_bo_mem_space(bo, placement, &mem,
1151                                interruptible, no_wait_gpu);
1152         if (ret)
1153                 goto out_unlock;
1154         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1155                                      interruptible, no_wait_gpu);
1156 out_unlock:
1157         if (ret && mem.mm_node)
1158                 ttm_bo_mem_put(bo, &mem);
1159         return ret;
1160 }
1161
1162 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1163                              struct ttm_mem_reg *mem)
1164 {
1165         int i;
1166
1167         if (mem->mm_node && placement->lpfn != 0 &&
1168             (mem->start < placement->fpfn ||
1169              mem->start + mem->num_pages > placement->lpfn))
1170                 return -1;
1171
1172         for (i = 0; i < placement->num_placement; i++) {
1173                 if ((placement->placement[i] & mem->placement &
1174                         TTM_PL_MASK_CACHING) &&
1175                         (placement->placement[i] & mem->placement &
1176                         TTM_PL_MASK_MEM))
1177                         return i;
1178         }
1179         return -1;
1180 }
1181
1182 int ttm_bo_validate(struct ttm_buffer_object *bo,
1183                         struct ttm_placement *placement,
1184                         bool interruptible,
1185                         bool no_wait_gpu)
1186 {
1187         int ret;
1188
1189         BUG_ON(!ttm_bo_is_reserved(bo));
1190         /* Check that range is valid */
1191         if (placement->lpfn || placement->fpfn)
1192                 if (placement->fpfn > placement->lpfn ||
1193                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1194                         return -EINVAL;
1195         /*
1196          * Check whether we need to move buffer.
1197          */
1198         ret = ttm_bo_mem_compat(placement, &bo->mem);
1199         if (ret < 0) {
1200                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1201                                          no_wait_gpu);
1202                 if (ret)
1203                         return ret;
1204         } else {
1205                 /*
1206                  * Use the access and other non-mapping-related flag bits from
1207                  * the compatible memory placement flags to the active flags
1208                  */
1209                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1210                                 ~TTM_PL_MASK_MEMTYPE);
1211         }
1212         /*
1213          * We might need to add a TTM.
1214          */
1215         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1216                 ret = ttm_bo_add_ttm(bo, true);
1217                 if (ret)
1218                         return ret;
1219         }
1220         return 0;
1221 }
1222 EXPORT_SYMBOL(ttm_bo_validate);
1223
1224 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1225                                 struct ttm_placement *placement)
1226 {
1227         BUG_ON((placement->fpfn || placement->lpfn) &&
1228                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1229
1230         return 0;
1231 }
1232
1233 int ttm_bo_init(struct ttm_bo_device *bdev,
1234                 struct ttm_buffer_object *bo,
1235                 unsigned long size,
1236                 enum ttm_bo_type type,
1237                 struct ttm_placement *placement,
1238                 uint32_t page_alignment,
1239                 bool interruptible,
1240                 struct vm_object *persistent_swap_storage,
1241                 size_t acc_size,
1242                 struct sg_table *sg,
1243                 void (*destroy) (struct ttm_buffer_object *))
1244 {
1245         int ret = 0;
1246         unsigned long num_pages;
1247         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1248
1249         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1250         if (ret) {
1251                 kprintf("[TTM] Out of kernel memory\n");
1252                 if (destroy)
1253                         (*destroy)(bo);
1254                 else
1255                         kfree(bo, M_DRM);
1256                 return -ENOMEM;
1257         }
1258
1259         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1260         if (num_pages == 0) {
1261                 kprintf("[TTM] Illegal buffer object size\n");
1262                 if (destroy)
1263                         (*destroy)(bo);
1264                 else
1265                         kfree(bo, M_DRM);
1266                 ttm_mem_global_free(mem_glob, acc_size);
1267                 return -EINVAL;
1268         }
1269         bo->destroy = destroy;
1270
1271         kref_init(&bo->kref);
1272         kref_init(&bo->list_kref);
1273         atomic_set(&bo->cpu_writers, 0);
1274         atomic_set(&bo->reserved, 1);
1275         init_waitqueue_head(&bo->event_queue);
1276         INIT_LIST_HEAD(&bo->lru);
1277         INIT_LIST_HEAD(&bo->ddestroy);
1278         INIT_LIST_HEAD(&bo->swap);
1279         INIT_LIST_HEAD(&bo->io_reserve_lru);
1280         /*bzero(&bo->vm_rb, sizeof(bo->vm_rb));*/
1281         bo->bdev = bdev;
1282         bo->glob = bdev->glob;
1283         bo->type = type;
1284         bo->num_pages = num_pages;
1285         bo->mem.size = num_pages << PAGE_SHIFT;
1286         bo->mem.mem_type = TTM_PL_SYSTEM;
1287         bo->mem.num_pages = bo->num_pages;
1288         bo->mem.mm_node = NULL;
1289         bo->mem.page_alignment = page_alignment;
1290         bo->mem.bus.io_reserved_vm = false;
1291         bo->mem.bus.io_reserved_count = 0;
1292         bo->priv_flags = 0;
1293         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1294         bo->seq_valid = false;
1295         bo->persistent_swap_storage = persistent_swap_storage;
1296         bo->acc_size = acc_size;
1297         bo->sg = sg;
1298         atomic_inc(&bo->glob->bo_count);
1299
1300         /*
1301          * Mirror ref from kref_init() for list_kref.
1302          */
1303         set_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
1304
1305         ret = ttm_bo_check_placement(bo, placement);
1306         if (unlikely(ret != 0))
1307                 goto out_err;
1308
1309         /*
1310          * For ttm_bo_type_device buffers, allocate
1311          * address space from the device.
1312          */
1313         if (bo->type == ttm_bo_type_device ||
1314             bo->type == ttm_bo_type_sg) {
1315                 ret = ttm_bo_setup_vm(bo);
1316                 if (ret)
1317                         goto out_err;
1318         }
1319
1320         ret = ttm_bo_validate(bo, placement, interruptible, false);
1321         if (ret)
1322                 goto out_err;
1323
1324         ttm_bo_unreserve(bo);
1325         return 0;
1326
1327 out_err:
1328         ttm_bo_unreserve(bo);
1329         ttm_bo_unref(&bo);
1330
1331         return ret;
1332 }
1333 EXPORT_SYMBOL(ttm_bo_init);
1334
1335 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1336                        unsigned long bo_size,
1337                        unsigned struct_size)
1338 {
1339         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1340         size_t size = 0;
1341
1342         size += ttm_round_pot(struct_size);
1343         size += PAGE_ALIGN(npages * sizeof(void *));
1344         size += ttm_round_pot(sizeof(struct ttm_tt));
1345         return size;
1346 }
1347 EXPORT_SYMBOL(ttm_bo_acc_size);
1348
1349 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1350                            unsigned long bo_size,
1351                            unsigned struct_size)
1352 {
1353         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1354         size_t size = 0;
1355
1356         size += ttm_round_pot(struct_size);
1357         size += PAGE_ALIGN(npages * sizeof(void *));
1358         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1359         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1360         return size;
1361 }
1362 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1363
1364 int ttm_bo_create(struct ttm_bo_device *bdev,
1365                         unsigned long size,
1366                         enum ttm_bo_type type,
1367                         struct ttm_placement *placement,
1368                         uint32_t page_alignment,
1369                         bool interruptible,
1370                         struct vm_object *persistent_swap_storage,
1371                         struct ttm_buffer_object **p_bo)
1372 {
1373         struct ttm_buffer_object *bo;
1374         size_t acc_size;
1375         int ret;
1376
1377         *p_bo = NULL;
1378         bo = kmalloc(sizeof(*bo), M_DRM, M_WAITOK | M_ZERO);
1379         if (unlikely(bo == NULL))
1380                 return -ENOMEM;
1381
1382         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1383         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1384                           interruptible, persistent_swap_storage, acc_size,
1385                           NULL, NULL);
1386         if (likely(ret == 0))
1387                 *p_bo = bo;
1388
1389         return ret;
1390 }
1391 EXPORT_SYMBOL(ttm_bo_create);
1392
1393 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1394                                         unsigned mem_type, bool allow_errors)
1395 {
1396         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1397         struct ttm_bo_global *glob = bdev->glob;
1398         int ret;
1399
1400         /*
1401          * Can't use standard list traversal since we're unlocking.
1402          */
1403
1404         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1405         while (!list_empty(&man->lru)) {
1406                 lockmgr(&glob->lru_lock, LK_RELEASE);
1407                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1408                 if (ret) {
1409                         if (allow_errors) {
1410                                 return ret;
1411                         } else {
1412                                 kprintf("[TTM] Cleanup eviction failed\n");
1413                         }
1414                 }
1415                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1416         }
1417         lockmgr(&glob->lru_lock, LK_RELEASE);
1418         return 0;
1419 }
1420
1421 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1422 {
1423         struct ttm_mem_type_manager *man;
1424         int ret = -EINVAL;
1425
1426         if (mem_type >= TTM_NUM_MEM_TYPES) {
1427                 kprintf("[TTM] Illegal memory type %d\n", mem_type);
1428                 return ret;
1429         }
1430         man = &bdev->man[mem_type];
1431
1432         if (!man->has_type) {
1433                 kprintf("[TTM] Trying to take down uninitialized memory manager type %u\n",
1434                        mem_type);
1435                 return ret;
1436         }
1437
1438         man->use_type = false;
1439         man->has_type = false;
1440
1441         ret = 0;
1442         if (mem_type > 0) {
1443                 ttm_bo_force_list_clean(bdev, mem_type, false);
1444
1445                 ret = (*man->func->takedown)(man);
1446         }
1447
1448         return ret;
1449 }
1450 EXPORT_SYMBOL(ttm_bo_clean_mm);
1451
1452 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1453 {
1454         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1455
1456         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1457                 kprintf("[TTM] Illegal memory manager memory type %u\n", mem_type);
1458                 return -EINVAL;
1459         }
1460
1461         if (!man->has_type) {
1462                 kprintf("[TTM] Memory type %u has not been initialized\n", mem_type);
1463                 return 0;
1464         }
1465
1466         return ttm_bo_force_list_clean(bdev, mem_type, true);
1467 }
1468 EXPORT_SYMBOL(ttm_bo_evict_mm);
1469
1470 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1471                         unsigned long p_size)
1472 {
1473         int ret = -EINVAL;
1474         struct ttm_mem_type_manager *man;
1475
1476         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1477         man = &bdev->man[type];
1478         BUG_ON(man->has_type);
1479         man->io_reserve_fastpath = true;
1480         man->use_io_reserve_lru = false;
1481         lockinit(&man->io_reserve_mutex, "ttmman", 0, LK_CANRECURSE);
1482         INIT_LIST_HEAD(&man->io_reserve_lru);
1483
1484         ret = bdev->driver->init_mem_type(bdev, type, man);
1485         if (ret)
1486                 return ret;
1487         man->bdev = bdev;
1488
1489         ret = 0;
1490         if (type != TTM_PL_SYSTEM) {
1491                 ret = (*man->func->init)(man, p_size);
1492                 if (ret)
1493                         return ret;
1494         }
1495         man->has_type = true;
1496         man->use_type = true;
1497         man->size = p_size;
1498
1499         INIT_LIST_HEAD(&man->lru);
1500
1501         return 0;
1502 }
1503 EXPORT_SYMBOL(ttm_bo_init_mm);
1504
1505 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob)
1506 {
1507         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1508         vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1509         glob->dummy_read_page = NULL;
1510         /*
1511         vm_page_free(glob->dummy_read_page);
1512         */
1513 }
1514
1515 void ttm_bo_global_release(struct drm_global_reference *ref)
1516 {
1517         struct ttm_bo_global *glob = ref->object;
1518
1519         if (refcount_release(&glob->kobj_ref))
1520                 ttm_bo_global_kobj_release(glob);
1521 }
1522 EXPORT_SYMBOL(ttm_bo_global_release);
1523
1524 int ttm_bo_global_init(struct drm_global_reference *ref)
1525 {
1526         struct ttm_bo_global_ref *bo_ref =
1527                 container_of(ref, struct ttm_bo_global_ref, ref);
1528         struct ttm_bo_global *glob = ref->object;
1529         int ret;
1530
1531         lockinit(&glob->device_list_mutex, "ttmdlm", 0, LK_CANRECURSE);
1532         lockinit(&glob->lru_lock, "ttmlru", 0, LK_CANRECURSE);
1533         glob->mem_glob = bo_ref->mem_glob;
1534         glob->dummy_read_page = vm_page_alloc_contig(
1535             0, VM_MAX_ADDRESS, PAGE_SIZE, 0, 1*PAGE_SIZE, VM_MEMATTR_UNCACHEABLE);
1536
1537         if (unlikely(glob->dummy_read_page == NULL)) {
1538                 ret = -ENOMEM;
1539                 goto out_no_drp;
1540         }
1541
1542         INIT_LIST_HEAD(&glob->swap_lru);
1543         INIT_LIST_HEAD(&glob->device_list);
1544
1545         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1546         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1547         if (unlikely(ret != 0)) {
1548                 kprintf("[TTM] Could not register buffer object swapout\n");
1549                 goto out_no_shrink;
1550         }
1551
1552         atomic_set(&glob->bo_count, 0);
1553
1554         refcount_init(&glob->kobj_ref, 1);
1555         return (0);
1556
1557 out_no_shrink:
1558         vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1559         glob->dummy_read_page = NULL;
1560         /*
1561         vm_page_free(glob->dummy_read_page);
1562         */
1563 out_no_drp:
1564         kfree(glob, M_DRM);
1565         return ret;
1566 }
1567 EXPORT_SYMBOL(ttm_bo_global_init);
1568
1569
1570 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1571 {
1572         int ret = 0;
1573         unsigned i = TTM_NUM_MEM_TYPES;
1574         struct ttm_mem_type_manager *man;
1575         struct ttm_bo_global *glob = bdev->glob;
1576
1577         while (i--) {
1578                 man = &bdev->man[i];
1579                 if (man->has_type) {
1580                         man->use_type = false;
1581                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1582                                 ret = -EBUSY;
1583                                 kprintf("[TTM] DRM memory manager type %d is not clean\n",
1584                                        i);
1585                         }
1586                         man->has_type = false;
1587                 }
1588         }
1589
1590         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1591         list_del(&bdev->device_list);
1592         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1593
1594         cancel_delayed_work_sync(&bdev->wq);
1595
1596         while (ttm_bo_delayed_delete(bdev, true))
1597                 ;
1598
1599         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1600         if (list_empty(&bdev->ddestroy))
1601                 TTM_DEBUG("Delayed destroy list was clean\n");
1602
1603         if (list_empty(&bdev->man[0].lru))
1604                 TTM_DEBUG("Swap list was clean\n");
1605         lockmgr(&glob->lru_lock, LK_RELEASE);
1606
1607         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1608         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1609         drm_mm_takedown(&bdev->addr_space_mm);
1610         lockmgr(&bdev->vm_lock, LK_RELEASE);
1611
1612         return ret;
1613 }
1614 EXPORT_SYMBOL(ttm_bo_device_release);
1615
1616 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1617                        struct ttm_bo_global *glob,
1618                        struct ttm_bo_driver *driver,
1619                        uint64_t file_page_offset,
1620                        bool need_dma32)
1621 {
1622         int ret = -EINVAL;
1623
1624         lockinit(&bdev->vm_lock, "ttmvml", 0, LK_CANRECURSE);
1625         bdev->driver = driver;
1626
1627         memset(bdev->man, 0, sizeof(bdev->man));
1628
1629         /*
1630          * Initialize the system memory buffer type.
1631          * Other types need to be driver / IOCTL initialized.
1632          */
1633         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1634         if (unlikely(ret != 0))
1635                 goto out_no_sys;
1636
1637         RB_INIT(&bdev->addr_space_rb);
1638         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1639         if (unlikely(ret != 0))
1640                 goto out_no_addr_mm;
1641
1642         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1643         INIT_LIST_HEAD(&bdev->ddestroy);
1644         bdev->dev_mapping = NULL;
1645         bdev->glob = glob;
1646         bdev->need_dma32 = need_dma32;
1647         bdev->val_seq = 0;
1648         lockinit(&bdev->fence_lock, "ttmfence", 0, LK_CANRECURSE);
1649         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1650         list_add_tail(&bdev->device_list, &glob->device_list);
1651         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1652
1653         return 0;
1654 out_no_addr_mm:
1655         ttm_bo_clean_mm(bdev, 0);
1656 out_no_sys:
1657         return ret;
1658 }
1659 EXPORT_SYMBOL(ttm_bo_device_init);
1660
1661 /*
1662  * buffer object vm functions.
1663  */
1664
1665 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1666 {
1667         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1668
1669         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1670                 if (mem->mem_type == TTM_PL_SYSTEM)
1671                         return false;
1672
1673                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1674                         return false;
1675
1676                 if (mem->placement & TTM_PL_FLAG_CACHED)
1677                         return false;
1678         }
1679         return true;
1680 }
1681
1682 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1683 {
1684
1685         ttm_bo_release_mmap(bo);
1686         ttm_mem_io_free_vm(bo);
1687 }
1688
1689 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1690 {
1691         struct ttm_bo_device *bdev = bo->bdev;
1692         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1693
1694         ttm_mem_io_lock(man, false);
1695         ttm_bo_unmap_virtual_locked(bo);
1696         ttm_mem_io_unlock(man);
1697 }
1698
1699
1700 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1701
1702 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1703 {
1704         struct ttm_bo_device *bdev = bo->bdev;
1705
1706         /* The caller acquired bdev->vm_lock. */
1707         RB_INSERT(ttm_bo_device_buffer_objects, &bdev->addr_space_rb, bo);
1708 }
1709
1710 /**
1711  * ttm_bo_setup_vm:
1712  *
1713  * @bo: the buffer to allocate address space for
1714  *
1715  * Allocate address space in the drm device so that applications
1716  * can mmap the buffer and access the contents. This only
1717  * applies to ttm_bo_type_device objects as others are not
1718  * placed in the drm device address space.
1719  */
1720
1721 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1722 {
1723         struct ttm_bo_device *bdev = bo->bdev;
1724         int ret;
1725
1726 retry_pre_get:
1727         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1728         if (unlikely(ret != 0))
1729                 return ret;
1730
1731         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1732         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1733                                          bo->mem.num_pages, 0, 0);
1734
1735         if (unlikely(bo->vm_node == NULL)) {
1736                 ret = -ENOMEM;
1737                 goto out_unlock;
1738         }
1739
1740         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1741                                               bo->mem.num_pages, 0);
1742
1743         if (unlikely(bo->vm_node == NULL)) {
1744                 lockmgr(&bdev->vm_lock, LK_RELEASE);
1745                 goto retry_pre_get;
1746         }
1747
1748         ttm_bo_vm_insert_rb(bo);
1749         lockmgr(&bdev->vm_lock, LK_RELEASE);
1750         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1751
1752         return 0;
1753 out_unlock:
1754         lockmgr(&bdev->vm_lock, LK_RELEASE);
1755         return ret;
1756 }
1757
1758 int ttm_bo_wait(struct ttm_buffer_object *bo,
1759                 bool lazy, bool interruptible, bool no_wait)
1760 {
1761         struct ttm_bo_driver *driver = bo->bdev->driver;
1762         struct ttm_bo_device *bdev = bo->bdev;
1763         void *sync_obj;
1764         int ret = 0;
1765
1766         if (likely(bo->sync_obj == NULL))
1767                 return 0;
1768
1769         while (bo->sync_obj) {
1770
1771                 if (driver->sync_obj_signaled(bo->sync_obj)) {
1772                         void *tmp_obj = bo->sync_obj;
1773                         bo->sync_obj = NULL;
1774                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1775                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1776                         driver->sync_obj_unref(&tmp_obj);
1777                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1778                         continue;
1779                 }
1780
1781                 if (no_wait)
1782                         return -EBUSY;
1783
1784                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1785                 lockmgr(&bdev->fence_lock, LK_RELEASE);
1786                 ret = driver->sync_obj_wait(sync_obj,
1787                                             lazy, interruptible);
1788                 if (unlikely(ret != 0)) {
1789                         driver->sync_obj_unref(&sync_obj);
1790                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1791                         return ret;
1792                 }
1793                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1794                 if (likely(bo->sync_obj == sync_obj)) {
1795                         void *tmp_obj = bo->sync_obj;
1796                         bo->sync_obj = NULL;
1797                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1798                                   &bo->priv_flags);
1799                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1800                         driver->sync_obj_unref(&sync_obj);
1801                         driver->sync_obj_unref(&tmp_obj);
1802                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1803                 } else {
1804                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1805                         driver->sync_obj_unref(&sync_obj);
1806                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1807                 }
1808         }
1809         return 0;
1810 }
1811 EXPORT_SYMBOL(ttm_bo_wait);
1812
1813 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1814 {
1815         struct ttm_bo_device *bdev = bo->bdev;
1816         int ret = 0;
1817
1818         /*
1819          * Using ttm_bo_reserve makes sure the lru lists are updated.
1820          */
1821
1822         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1823         if (unlikely(ret != 0))
1824                 return ret;
1825         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1826         ret = ttm_bo_wait(bo, false, true, no_wait);
1827         lockmgr(&bdev->fence_lock, LK_RELEASE);
1828         if (likely(ret == 0))
1829                 atomic_inc(&bo->cpu_writers);
1830         ttm_bo_unreserve(bo);
1831         return ret;
1832 }
1833 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1834
1835 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1836 {
1837         atomic_dec(&bo->cpu_writers);
1838 }
1839 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1840
1841 /**
1842  * A buffer object shrink method that tries to swap out the first
1843  * buffer object on the bo_global::swap_lru list.
1844  */
1845
1846 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1847 {
1848         struct ttm_bo_global *glob =
1849             container_of(shrink, struct ttm_bo_global, shrink);
1850         struct ttm_buffer_object *bo;
1851         int ret = -EBUSY;
1852         int put_count;
1853         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1854
1855         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1856         list_for_each_entry(bo, &glob->swap_lru, swap) {
1857                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1858                 if (!ret)
1859                         break;
1860         }
1861
1862         if (ret) {
1863                 lockmgr(&glob->lru_lock, LK_RELEASE);
1864                 return ret;
1865         }
1866
1867         kref_get(&bo->list_kref);
1868
1869         if (!list_empty(&bo->ddestroy)) {
1870                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1871                 kref_put(&bo->list_kref, ttm_bo_release_list);
1872                 return ret;
1873         }
1874
1875         put_count = ttm_bo_del_from_lru(bo);
1876         lockmgr(&glob->lru_lock, LK_RELEASE);
1877
1878         ttm_bo_list_ref_sub(bo, put_count, true);
1879
1880         /**
1881          * Wait for GPU, then move to system cached.
1882          */
1883
1884         lockmgr(&bo->bdev->fence_lock, LK_EXCLUSIVE);
1885         ret = ttm_bo_wait(bo, false, false, false);
1886         lockmgr(&bo->bdev->fence_lock, LK_RELEASE);
1887
1888         if (unlikely(ret != 0))
1889                 goto out;
1890
1891         if ((bo->mem.placement & swap_placement) != swap_placement) {
1892                 struct ttm_mem_reg evict_mem;
1893
1894                 evict_mem = bo->mem;
1895                 evict_mem.mm_node = NULL;
1896                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1897                 evict_mem.mem_type = TTM_PL_SYSTEM;
1898
1899                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1900                                              false, false);
1901                 if (unlikely(ret != 0))
1902                         goto out;
1903         }
1904
1905         ttm_bo_unmap_virtual(bo);
1906
1907         /**
1908          * Swap out. Buffer will be swapped in again as soon as
1909          * anyone tries to access a ttm page.
1910          */
1911
1912         if (bo->bdev->driver->swap_notify)
1913                 bo->bdev->driver->swap_notify(bo);
1914
1915         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1916 out:
1917
1918         /**
1919          *
1920          * Unreserve without putting on LRU to avoid swapping out an
1921          * already swapped buffer.
1922          */
1923
1924         atomic_set(&bo->reserved, 0);
1925         wake_up_all(&bo->event_queue);
1926         kref_put(&bo->list_kref, ttm_bo_release_list);
1927         return ret;
1928 }
1929
1930 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1931 {
1932         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1933                 ;
1934 }
1935 EXPORT_SYMBOL(ttm_bo_swapout_all);