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
  31 #define pr_fmt(fmt) "[TTM] " fmt
  32
  33 #include <drm/ttm/ttm_module.h>
  34 #include <drm/ttm/ttm_bo_driver.h>
  35 #include <drm/ttm/ttm_placement.h>
  36 #include <linux/atomic.h>
  37 #include <linux/errno.h>
  38 #include <linux/export.h>
  39 #include <linux/wait.h>
  40
  41 #define TTM_ASSERT_LOCKED(param)
  42 #define TTM_DEBUG(fmt, arg...)
  43 #define TTM_BO_HASH_ORDER 13
  44
  45 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  46 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  47 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob);
  48
  49 static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type)
  50 {
  51         int i;
  52
  53         for (i = 0; i <= TTM_PL_PRIV5; i++)
  54                 if (flags & (1 << i)) {
  55                         *mem_type = i;
  56                         return 0;
  57                 }
  58         return -EINVAL;
  59 }
  60
  61 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  62 {
  63         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  64
  65         kprintf("    has_type: %d\n", man->has_type);
  66         kprintf("    use_type: %d\n", man->use_type);
  67         kprintf("    flags: 0x%08X\n", man->flags);
  68         kprintf("    gpu_offset: 0x%08lX\n", man->gpu_offset);
  69         kprintf("    size: %ju\n", (uintmax_t)man->size);
  70         kprintf("    available_caching: 0x%08X\n", man->available_caching);
  71         kprintf("    default_caching: 0x%08X\n", man->default_caching);
  72         if (mem_type != TTM_PL_SYSTEM)
  73                 (*man->func->debug)(man, TTM_PFX);
  74 }
  75
  76 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  77                                         struct ttm_placement *placement)
  78 {
  79         int i, ret, mem_type;
  80
  81         kprintf("No space for %p (%lu pages, %luK, %luM)\n",
  82                bo, bo->mem.num_pages, bo->mem.size >> 10,
  83                bo->mem.size >> 20);
  84         for (i = 0; i < placement->num_placement; i++) {
  85                 ret = ttm_mem_type_from_flags(placement->placement[i],
  86                                                 &mem_type);
  87                 if (ret)
  88                         return;
  89                 kprintf("  placement[%d]=0x%08X (%d)\n",
  90                        i, placement->placement[i], mem_type);
  91                 ttm_mem_type_debug(bo->bdev, mem_type);
  92         }
  93 }
  94
  95 #if 0
  96 static ssize_t ttm_bo_global_show(struct ttm_bo_global *glob,
  97     char *buffer)
  98 {
  99
 100         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 101                         (unsigned long) atomic_read(&glob->bo_count));
 102 }
 103 #endif
 104
 105 static inline uint32_t ttm_bo_type_flags(unsigned type)
 106 {
 107         return 1 << (type);
 108 }
 109
 110 static void ttm_bo_release_list(struct kref *list_kref)
 111 {
 112         struct ttm_buffer_object *bo =
 113             container_of(list_kref, struct ttm_buffer_object, list_kref);
 114         struct ttm_bo_device *bdev = bo->bdev;
 115         size_t acc_size = bo->acc_size;
 116
 117         BUG_ON(atomic_read(&bo->list_kref.refcount));
 118         BUG_ON(atomic_read(&bo->kref.refcount));
 119         BUG_ON(atomic_read(&bo->cpu_writers));
 120         BUG_ON(bo->sync_obj != NULL);
 121         BUG_ON(bo->mem.mm_node != NULL);
 122         BUG_ON(!list_empty(&bo->lru));
 123         BUG_ON(!list_empty(&bo->ddestroy));
 124
 125         if (bo->ttm)
 126                 ttm_tt_destroy(bo->ttm);
 127         atomic_dec(&bo->glob->bo_count);
 128         if (bo->destroy)
 129                 bo->destroy(bo);
 130         else {
 131                 kfree(bo);
 132         }
 133         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 134 }
 135
 136 static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
 137                                   bool interruptible)
 138 {
 139         if (interruptible) {
 140                 return wait_event_interruptible(bo->event_queue,
 141                                                !ttm_bo_is_reserved(bo));
 142         } else {
 143                 wait_event(bo->event_queue, !ttm_bo_is_reserved(bo));
 144                 return 0;
 145         }
 146 }
 147
 148 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 149 {
 150         struct ttm_bo_device *bdev = bo->bdev;
 151         struct ttm_mem_type_manager *man;
 152
 153         BUG_ON(!ttm_bo_is_reserved(bo));
 154
 155         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 156
 157                 BUG_ON(!list_empty(&bo->lru));
 158
 159                 man = &bdev->man[bo->mem.mem_type];
 160                 list_add_tail(&bo->lru, &man->lru);
 161                 kref_get(&bo->list_kref);
 162
 163                 if (bo->ttm != NULL) {
 164                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 165                         kref_get(&bo->list_kref);
 166                 }
 167         }
 168 }
 169
 170 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 171 {
 172         int put_count = 0;
 173
 174         if (!list_empty(&bo->swap)) {
 175                 list_del_init(&bo->swap);
 176                 ++put_count;
 177         }
 178         if (!list_empty(&bo->lru)) {
 179                 list_del_init(&bo->lru);
 180                 ++put_count;
 181         }
 182
 183         /*
 184          * TODO: Add a driver hook to delete from
 185          * driver-specific LRU's here.
 186          */
 187
 188         return put_count;
 189 }
 190
 191 int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
 192                           bool interruptible,
 193                           bool no_wait, bool use_sequence, uint32_t sequence)
 194 {
 195         int ret;
 196
 197         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 198                 /**
 199                  * Deadlock avoidance for multi-bo reserving.
 200                  */
 201                 if (use_sequence && bo->seq_valid) {
 202                         /**
 203                          * We've already reserved this one.
 204                          */
 205                         if (unlikely(sequence == bo->val_seq))
 206                                 return -EDEADLK;
 207                         /**
 208                          * Already reserved by a thread that will not back
 209                          * off for us. We need to back off.
 210                          */
 211                         if (unlikely(sequence - bo->val_seq < (1U << 31)))
 212                                 return -EAGAIN;
 213                 }
 214
 215                 if (no_wait)
 216                         return -EBUSY;
 217
 218                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 219
 220                 if (unlikely(ret))
 221                         return ret;
 222         }
 223
 224         if (use_sequence) {
 225                 bool wake_up = false;
 226                 /**
 227                  * Wake up waiters that may need to recheck for deadlock,
 228                  * if we decreased the sequence number.
 229                  */
 230                 if (unlikely((bo->val_seq - sequence < (1U << 31))
 231                              || !bo->seq_valid))
 232                         wake_up = true;
 233
 234                 /*
 235                  * In the worst case with memory ordering these values can be
 236                  * seen in the wrong order. However since we call wake_up_all
 237                  * in that case, this will hopefully not pose a problem,
 238                  * and the worst case would only cause someone to accidentally
 239                  * hit -EAGAIN in ttm_bo_reserve when they see old value of
 240                  * val_seq. However this would only happen if seq_valid was
 241                  * written before val_seq was, and just means some slightly
 242                  * increased cpu usage
 243                  */
 244                 bo->val_seq = sequence;
 245                 bo->seq_valid = true;
 246                 if (wake_up)
 247                         wake_up_all(&bo->event_queue);
 248         } else {
 249                 bo->seq_valid = false;
 250         }
 251
 252         return 0;
 253 }
 254 EXPORT_SYMBOL(ttm_bo_reserve);
 255
 256 static void ttm_bo_ref_bug(struct kref *list_kref)
 257 {
 258         BUG();
 259 }
 260
 261 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 262                          bool never_free)
 263 {
 264         kref_sub(&bo->list_kref, count,
 265                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 266 }
 267
 268 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 269                    bool interruptible,
 270                    bool no_wait, bool use_sequence, uint32_t sequence)
 271 {
 272         struct ttm_bo_global *glob = bo->glob;
 273         int put_count = 0;
 274         int ret;
 275
 276         ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_sequence,
 277                                    sequence);
 278         if (likely(ret == 0)) {
 279                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 280                 put_count = ttm_bo_del_from_lru(bo);
 281                 lockmgr(&glob->lru_lock, LK_RELEASE);
 282                 ttm_bo_list_ref_sub(bo, put_count, true);
 283         }
 284
 285         return ret;
 286 }
 287
 288 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
 289                                   bool interruptible, uint32_t sequence)
 290 {
 291         bool wake_up = false;
 292         int ret;
 293
 294         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 295                 WARN_ON(bo->seq_valid && sequence == bo->val_seq);
 296
 297                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 298
 299                 if (unlikely(ret))
 300                         return ret;
 301         }
 302
 303         if ((bo->val_seq - sequence < (1U << 31)) || !bo->seq_valid)
 304                 wake_up = true;
 305
 306         /**
 307          * Wake up waiters that may need to recheck for deadlock,
 308          * if we decreased the sequence number.
 309          */
 310         bo->val_seq = sequence;
 311         bo->seq_valid = true;
 312         if (wake_up)
 313                 wake_up_all(&bo->event_queue);
 314
 315         return 0;
 316 }
 317
 318 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 319                             bool interruptible, uint32_t sequence)
 320 {
 321         struct ttm_bo_global *glob = bo->glob;
 322         int put_count, ret;
 323
 324         ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, sequence);
 325         if (likely(!ret)) {
 326                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 327                 put_count = ttm_bo_del_from_lru(bo);
 328                 lockmgr(&glob->lru_lock, LK_RELEASE);
 329                 ttm_bo_list_ref_sub(bo, put_count, true);
 330         }
 331         return ret;
 332 }
 333 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
 334
 335 /*
 336  * Must interlock with event_queue to avoid race against
 337  * wait_event_common() which can cause wait_event_common()
 338  * to become stuck.
 339  */
 340 static void
 341 ttm_bo_unreserve_core(struct ttm_buffer_object *bo)
 342 {
 343         lockmgr(&bo->event_queue.lock, LK_EXCLUSIVE);
 344         atomic_set(&bo->reserved, 0);
 345         lockmgr(&bo->event_queue.lock, LK_RELEASE);
 346         wake_up_all(&bo->event_queue);
 347 }
 348
 349 void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo)
 350 {
 351         ttm_bo_add_to_lru(bo);
 352         ttm_bo_unreserve_core(bo);
 353 }
 354
 355 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 356 {
 357         struct ttm_bo_global *glob = bo->glob;
 358
 359         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 360         ttm_bo_unreserve_locked(bo);
 361         lockmgr(&glob->lru_lock, LK_RELEASE);
 362 }
 363 EXPORT_SYMBOL(ttm_bo_unreserve);
 364
 365 /*
 366  * Call bo->mutex locked.
 367  */
 368 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 369 {
 370         struct ttm_bo_device *bdev = bo->bdev;
 371         struct ttm_bo_global *glob = bo->glob;
 372         int ret = 0;
 373         uint32_t page_flags = 0;
 374
 375         TTM_ASSERT_LOCKED(&bo->mutex);
 376         bo->ttm = NULL;
 377
 378         if (bdev->need_dma32)
 379                 page_flags |= TTM_PAGE_FLAG_DMA32;
 380
 381         switch (bo->type) {
 382         case ttm_bo_type_device:
 383                 if (zero_alloc)
 384                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 385         case ttm_bo_type_kernel:
 386                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 387                                                       page_flags, glob->dummy_read_page);
 388                 if (unlikely(bo->ttm == NULL))
 389                         ret = -ENOMEM;
 390                 break;
 391         case ttm_bo_type_sg:
 392                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 393                                                       page_flags | TTM_PAGE_FLAG_SG,
 394                                                       glob->dummy_read_page);
 395                 if (unlikely(bo->ttm == NULL)) {
 396                         ret = -ENOMEM;
 397                         break;
 398                 }
 399                 bo->ttm->sg = bo->sg;
 400                 break;
 401         default:
 402                 kprintf("[TTM] Illegal buffer object type\n");
 403                 ret = -EINVAL;
 404                 break;
 405         }
 406
 407         return ret;
 408 }
 409
 410 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 411                                   struct ttm_mem_reg *mem,
 412                                   bool evict, bool interruptible,
 413                                   bool no_wait_gpu)
 414 {
 415         struct ttm_bo_device *bdev = bo->bdev;
 416         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 417         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 418         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 419         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 420         int ret = 0;
 421
 422         if (old_is_pci || new_is_pci ||
 423             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 424                 ret = ttm_mem_io_lock(old_man, true);
 425                 if (unlikely(ret != 0))
 426                         goto out_err;
 427                 ttm_bo_unmap_virtual_locked(bo);
 428                 ttm_mem_io_unlock(old_man);
 429         }
 430
 431         /*
 432          * Create and bind a ttm if required.
 433          */
 434
 435         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 436                 if (bo->ttm == NULL) {
 437                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 438                         ret = ttm_bo_add_ttm(bo, zero);
 439                         if (ret)
 440                                 goto out_err;
 441                 }
 442
 443                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 444                 if (ret)
 445                         goto out_err;
 446
 447                 if (mem->mem_type != TTM_PL_SYSTEM) {
 448                         ret = ttm_tt_bind(bo->ttm, mem);
 449                         if (ret)
 450                                 goto out_err;
 451                 }
 452
 453                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 454                         if (bdev->driver->move_notify)
 455                                 bdev->driver->move_notify(bo, mem);
 456                         bo->mem = *mem;
 457                         mem->mm_node = NULL;
 458                         goto moved;
 459                 }
 460         }
 461
 462         if (bdev->driver->move_notify)
 463                 bdev->driver->move_notify(bo, mem);
 464
 465         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 466             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 467                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 468         else if (bdev->driver->move)
 469                 ret = bdev->driver->move(bo, evict, interruptible,
 470                                          no_wait_gpu, mem);
 471         else
 472                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 473
 474         if (ret) {
 475                 if (bdev->driver->move_notify) {
 476                         struct ttm_mem_reg tmp_mem = *mem;
 477                         *mem = bo->mem;
 478                         bo->mem = tmp_mem;
 479                         bdev->driver->move_notify(bo, mem);
 480                         bo->mem = *mem;
 481                         *mem = tmp_mem;
 482                 }
 483
 484                 goto out_err;
 485         }
 486
 487 moved:
 488         if (bo->evicted) {
 489                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 490                 if (ret)
 491                         kprintf("[TTM] Can not flush read caches\n");
 492                 bo->evicted = false;
 493         }
 494
 495         if (bo->mem.mm_node) {
 496                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 497                     bdev->man[bo->mem.mem_type].gpu_offset;
 498                 bo->cur_placement = bo->mem.placement;
 499         } else
 500                 bo->offset = 0;
 501
 502         return 0;
 503
 504 out_err:
 505         new_man = &bdev->man[bo->mem.mem_type];
 506         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 507                 ttm_tt_unbind(bo->ttm);
 508                 ttm_tt_destroy(bo->ttm);
 509                 bo->ttm = NULL;
 510         }
 511
 512         return ret;
 513 }
 514
 515 /**
 516  * Call bo::reserved.
 517  * Will release GPU memory type usage on destruction.
 518  * This is the place to put in driver specific hooks to release
 519  * driver private resources.
 520  * Will release the bo::reserved lock.
 521  */
 522
 523 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 524 {
 525         if (bo->bdev->driver->move_notify)
 526                 bo->bdev->driver->move_notify(bo, NULL);
 527
 528         if (bo->ttm) {
 529                 ttm_tt_unbind(bo->ttm);
 530                 ttm_tt_destroy(bo->ttm);
 531                 bo->ttm = NULL;
 532         }
 533         ttm_bo_mem_put(bo, &bo->mem);
 534         ttm_bo_unreserve_core(bo);
 535
 536         /*
 537          * Since the final reference to this bo may not be dropped by
 538          * the current task we have to put a memory barrier here to make
 539          * sure the changes done in this function are always visible.
 540          *
 541          * This function only needs protection against the final kref_put.
 542          */
 543         cpu_mfence();
 544 }
 545
 546 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 547 {
 548         struct ttm_bo_device *bdev = bo->bdev;
 549         struct ttm_bo_global *glob = bo->glob;
 550         struct ttm_bo_driver *driver = bdev->driver;
 551         void *sync_obj = NULL;
 552         int put_count;
 553         int ret;
 554
 555         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 556         ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 557
 558         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 559         (void) ttm_bo_wait(bo, false, false, true);
 560         if (!ret && !bo->sync_obj) {
 561                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 562                 put_count = ttm_bo_del_from_lru(bo);
 563
 564                 lockmgr(&glob->lru_lock, LK_RELEASE);
 565                 ttm_bo_cleanup_memtype_use(bo);
 566
 567                 ttm_bo_list_ref_sub(bo, put_count, true);
 568
 569                 return;
 570         }
 571         if (bo->sync_obj)
 572                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 573         lockmgr(&bdev->fence_lock, LK_RELEASE);
 574
 575         if (!ret) {
 576                 ttm_bo_unreserve_core(bo);
 577         }
 578
 579         kref_get(&bo->list_kref);
 580         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 581         lockmgr(&glob->lru_lock, LK_RELEASE);
 582
 583         if (sync_obj) {
 584                 driver->sync_obj_flush(sync_obj);
 585                 driver->sync_obj_unref(&sync_obj);
 586         }
 587         schedule_delayed_work(&bdev->wq,
 588                               ((hz / 100) < 1) ? 1 : hz / 100);
 589 }
 590
 591 /**
 592  * function ttm_bo_cleanup_refs_and_unlock
 593  * If bo idle, remove from delayed- and lru lists, and unref.
 594  * If not idle, do nothing.
 595  *
 596  * Must be called with lru_lock and reservation held, this function
 597  * will drop both before returning.
 598  *
 599  * @interruptible         Any sleeps should occur interruptibly.
 600  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 601  */
 602
 603 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 604                                           bool interruptible,
 605                                           bool no_wait_gpu)
 606 {
 607         struct ttm_bo_device *bdev = bo->bdev;
 608         struct ttm_bo_driver *driver = bdev->driver;
 609         struct ttm_bo_global *glob = bo->glob;
 610         int put_count;
 611         int ret;
 612
 613         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 614         ret = ttm_bo_wait(bo, false, false, true);
 615
 616         if (ret && !no_wait_gpu) {
 617                 void *sync_obj;
 618
 619                 /*
 620                  * Take a reference to the fence and unreserve,
 621                  * at this point the buffer should be dead, so
 622                  * no new sync objects can be attached.
 623                  */
 624                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 625                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 626
 627                 ttm_bo_unreserve_core(bo);
 628                 lockmgr(&glob->lru_lock, LK_RELEASE);
 629
 630                 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
 631                 driver->sync_obj_unref(&sync_obj);
 632                 if (ret)
 633                         return ret;
 634
 635                 /*
 636                  * remove sync_obj with ttm_bo_wait, the wait should be
 637                  * finished, and no new wait object should have been added.
 638                  */
 639                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 640                 ret = ttm_bo_wait(bo, false, false, true);
 641                 WARN_ON(ret);
 642                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 643                 if (ret)
 644                         return ret;
 645
 646                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 647                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 648
 649                 /*
 650                  * We raced, and lost, someone else holds the reservation now,
 651                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 652                  *
 653                  * Even if it's not the case, because we finished waiting any
 654                  * delayed destruction would succeed, so just return success
 655                  * here.
 656                  */
 657                 if (ret) {
 658                         lockmgr(&glob->lru_lock, LK_RELEASE);
 659                         return 0;
 660                 }
 661         } else
 662                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 663
 664         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 665                 ttm_bo_unreserve_core(bo);
 666                 lockmgr(&glob->lru_lock, LK_RELEASE);
 667                 return ret;
 668         }
 669
 670         put_count = ttm_bo_del_from_lru(bo);
 671         list_del_init(&bo->ddestroy);
 672         ++put_count;
 673
 674         lockmgr(&glob->lru_lock, LK_RELEASE);
 675         ttm_bo_cleanup_memtype_use(bo);
 676
 677         ttm_bo_list_ref_sub(bo, put_count, true);
 678
 679         return 0;
 680 }
 681
 682 /**
 683  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 684  * encountered buffers.
 685  */
 686
 687 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 688 {
 689         struct ttm_bo_global *glob = bdev->glob;
 690         struct ttm_buffer_object *entry = NULL;
 691         int ret = 0;
 692
 693         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 694         if (list_empty(&bdev->ddestroy))
 695                 goto out_unlock;
 696
 697         entry = list_first_entry(&bdev->ddestroy,
 698                 struct ttm_buffer_object, ddestroy);
 699         kref_get(&entry->list_kref);
 700
 701         for (;;) {
 702                 struct ttm_buffer_object *nentry = NULL;
 703
 704                 if (entry->ddestroy.next != &bdev->ddestroy) {
 705                         nentry = list_first_entry(&entry->ddestroy,
 706                                 struct ttm_buffer_object, ddestroy);
 707                         kref_get(&nentry->list_kref);
 708                 }
 709
 710                 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
 711                 if (remove_all && ret) {
 712                         lockmgr(&glob->lru_lock, LK_RELEASE);
 713                         ret = ttm_bo_reserve_nolru(entry, false, false,
 714                                                    false, 0);
 715                         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 716                 }
 717
 718                 if (!ret)
 719                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 720                                                              !remove_all);
 721                 else
 722                         lockmgr(&glob->lru_lock, LK_RELEASE);
 723
 724                 kref_put(&entry->list_kref, ttm_bo_release_list);
 725                 entry = nentry;
 726
 727                 if (ret || !entry)
 728                         goto out;
 729
 730                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 731                 if (list_empty(&entry->ddestroy))
 732                         break;
 733         }
 734
 735 out_unlock:
 736         lockmgr(&glob->lru_lock, LK_RELEASE);
 737 out:
 738         if (entry)
 739                 kref_put(&entry->list_kref, ttm_bo_release_list);
 740         return ret;
 741 }
 742
 743 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 744 {
 745         struct ttm_bo_device *bdev =
 746             container_of(work, struct ttm_bo_device, wq.work);
 747
 748         if (ttm_bo_delayed_delete(bdev, false)) {
 749                 schedule_delayed_work(&bdev->wq,
 750                                       ((hz / 100) < 1) ? 1 : hz / 100);
 751         }
 752 }
 753
 754 /*
 755  * NOTE: bdev->vm_lock already held on call, this function release it.
 756  */
 757 static void ttm_bo_release(struct kref *kref)
 758 {
 759         struct ttm_buffer_object *bo =
 760             container_of(kref, struct ttm_buffer_object, kref);
 761         struct ttm_bo_device *bdev = bo->bdev;
 762         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 763         int release_active;
 764
 765         if (atomic_read(&bo->kref.refcount) > 0) {
 766                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 767                 return;
 768         }
 769         if (likely(bo->vm_node != NULL)) {
 770                 RB_REMOVE(ttm_bo_device_buffer_objects,
 771                                 &bdev->addr_space_rb, bo);
 772                 drm_mm_put_block(bo->vm_node);
 773                 bo->vm_node = NULL;
 774         }
 775
 776         /*
 777          * Should we clean up our implied list_kref?  Because ttm_bo_release()
 778          * can be called reentrantly due to races (this may not be true any
 779          * more with the lock management changes in the deref), it is possible
 780          * to get here twice, but there's only one list_kref ref to drop and
 781          * in the other path 'bo' can be kfree()d by another thread the
 782          * instant we release our lock.
 783          */
 784         release_active = test_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 785         if (release_active) {
 786                 clear_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 787                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 788                 ttm_mem_io_lock(man, false);
 789                 ttm_mem_io_free_vm(bo);
 790                 ttm_mem_io_unlock(man);
 791                 ttm_bo_cleanup_refs_or_queue(bo);
 792                 kref_put(&bo->list_kref, ttm_bo_release_list);
 793         } else {
 794                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 795         }
 796 }
 797
 798 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 799 {
 800         struct ttm_buffer_object *bo = *p_bo;
 801         struct ttm_bo_device *bdev = bo->bdev;
 802
 803         *p_bo = NULL;
 804         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
 805         if (kref_put(&bo->kref, ttm_bo_release) == 0)
 806                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 807 }
 808 EXPORT_SYMBOL(ttm_bo_unref);
 809
 810 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 811 {
 812         return cancel_delayed_work_sync(&bdev->wq);
 813 }
 814 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 815
 816 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 817 {
 818         if (resched)
 819                 schedule_delayed_work(&bdev->wq,
 820                                       ((hz / 100) < 1) ? 1 : hz / 100);
 821 }
 822 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 823
 824 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 825                         bool no_wait_gpu)
 826 {
 827         struct ttm_bo_device *bdev = bo->bdev;
 828         struct ttm_mem_reg evict_mem;
 829         struct ttm_placement placement;
 830         int ret = 0;
 831
 832         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 833         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 834         lockmgr(&bdev->fence_lock, LK_RELEASE);
 835
 836         if (unlikely(ret != 0)) {
 837                 if (ret != -ERESTARTSYS) {
 838                         pr_err("Failed to expire sync object before buffer eviction\n");
 839                 }
 840                 goto out;
 841         }
 842
 843         BUG_ON(!ttm_bo_is_reserved(bo));
 844
 845         evict_mem = bo->mem;
 846         evict_mem.mm_node = NULL;
 847         evict_mem.bus.io_reserved_vm = false;
 848         evict_mem.bus.io_reserved_count = 0;
 849
 850         placement.fpfn = 0;
 851         placement.lpfn = 0;
 852         placement.num_placement = 0;
 853         placement.num_busy_placement = 0;
 854         bdev->driver->evict_flags(bo, &placement);
 855         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 856                                 no_wait_gpu);
 857         if (ret) {
 858                 if (ret != -ERESTARTSYS) {
 859                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 860                                bo);
 861                         ttm_bo_mem_space_debug(bo, &placement);
 862                 }
 863                 goto out;
 864         }
 865
 866         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 867                                      no_wait_gpu);
 868         if (ret) {
 869                 if (ret != -ERESTARTSYS)
 870                         pr_err("Buffer eviction failed\n");
 871                 ttm_bo_mem_put(bo, &evict_mem);
 872                 goto out;
 873         }
 874         bo->evicted = true;
 875 out:
 876         return ret;
 877 }
 878
 879 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 880                                 uint32_t mem_type,
 881                                 bool interruptible,
 882                                 bool no_wait_gpu)
 883 {
 884         struct ttm_bo_global *glob = bdev->glob;
 885         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 886         struct ttm_buffer_object *bo;
 887         int ret = -EBUSY, put_count;
 888
 889         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 890         list_for_each_entry(bo, &man->lru, lru) {
 891                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 892                 if (!ret)
 893                         break;
 894         }
 895
 896         if (ret) {
 897                 lockmgr(&glob->lru_lock, LK_RELEASE);
 898                 return ret;
 899         }
 900
 901         kref_get(&bo->list_kref);
 902
 903         if (!list_empty(&bo->ddestroy)) {
 904                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 905                                                      no_wait_gpu);
 906                 kref_put(&bo->list_kref, ttm_bo_release_list);
 907                 return ret;
 908         }
 909
 910         put_count = ttm_bo_del_from_lru(bo);
 911         lockmgr(&glob->lru_lock, LK_RELEASE);
 912
 913         BUG_ON(ret != 0);
 914
 915         ttm_bo_list_ref_sub(bo, put_count, true);
 916
 917         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 918         ttm_bo_unreserve(bo);
 919
 920         kref_put(&bo->list_kref, ttm_bo_release_list);
 921         return ret;
 922 }
 923
 924 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 925 {
 926         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 927
 928         if (mem->mm_node)
 929                 (*man->func->put_node)(man, mem);
 930 }
 931 EXPORT_SYMBOL(ttm_bo_mem_put);
 932
 933 /**
 934  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 935  * space, or we've evicted everything and there isn't enough space.
 936  */
 937 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 938                                         uint32_t mem_type,
 939                                         struct ttm_placement *placement,
 940                                         struct ttm_mem_reg *mem,
 941                                         bool interruptible,
 942                                         bool no_wait_gpu)
 943 {
 944         struct ttm_bo_device *bdev = bo->bdev;
 945         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 946         int ret;
 947
 948         do {
 949                 ret = (*man->func->get_node)(man, bo, placement, mem);
 950                 if (unlikely(ret != 0))
 951                         return ret;
 952                 if (mem->mm_node)
 953                         break;
 954                 ret = ttm_mem_evict_first(bdev, mem_type,
 955                                           interruptible, no_wait_gpu);
 956                 if (unlikely(ret != 0))
 957                         return ret;
 958         } while (1);
 959         if (mem->mm_node == NULL)
 960                 return -ENOMEM;
 961         mem->mem_type = mem_type;
 962         return 0;
 963 }
 964
 965 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 966                                       uint32_t cur_placement,
 967                                       uint32_t proposed_placement)
 968 {
 969         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 970         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 971
 972         /**
 973          * Keep current caching if possible.
 974          */
 975
 976         if ((cur_placement & caching) != 0)
 977                 result |= (cur_placement & caching);
 978         else if ((man->default_caching & caching) != 0)
 979                 result |= man->default_caching;
 980         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 981                 result |= TTM_PL_FLAG_CACHED;
 982         else if ((TTM_PL_FLAG_WC & caching) != 0)
 983                 result |= TTM_PL_FLAG_WC;
 984         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 985                 result |= TTM_PL_FLAG_UNCACHED;
 986
 987         return result;
 988 }
 989
 990 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 991                                  uint32_t mem_type,
 992                                  uint32_t proposed_placement,
 993                                  uint32_t *masked_placement)
 994 {
 995         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 996
 997         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
 998                 return false;
 999
1000         if ((proposed_placement & man->available_caching) == 0)
1001                 return false;
1002
1003         cur_flags |= (proposed_placement & man->available_caching);
1004
1005         *masked_placement = cur_flags;
1006         return true;
1007 }
1008
1009 /**
1010  * Creates space for memory region @mem according to its type.
1011  *
1012  * This function first searches for free space in compatible memory types in
1013  * the priority order defined by the driver.  If free space isn't found, then
1014  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1015  * space.
1016  */
1017 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1018                         struct ttm_placement *placement,
1019                         struct ttm_mem_reg *mem,
1020                         bool interruptible,
1021                         bool no_wait_gpu)
1022 {
1023         struct ttm_bo_device *bdev = bo->bdev;
1024         struct ttm_mem_type_manager *man;
1025         uint32_t mem_type = TTM_PL_SYSTEM;
1026         uint32_t cur_flags = 0;
1027         bool type_found = false;
1028         bool type_ok = false;
1029         bool has_erestartsys = false;
1030         int i, ret;
1031
1032         mem->mm_node = NULL;
1033         for (i = 0; i < placement->num_placement; ++i) {
1034                 ret = ttm_mem_type_from_flags(placement->placement[i],
1035                                                 &mem_type);
1036                 if (ret)
1037                         return ret;
1038                 man = &bdev->man[mem_type];
1039
1040                 type_ok = ttm_bo_mt_compatible(man,
1041                                                 mem_type,
1042                                                 placement->placement[i],
1043                                                 &cur_flags);
1044
1045                 if (!type_ok)
1046                         continue;
1047
1048                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1049                                                   cur_flags);
1050                 /*
1051                  * Use the access and other non-mapping-related flag bits from
1052                  * the memory placement flags to the current flags
1053                  */
1054                 ttm_flag_masked(&cur_flags, placement->placement[i],
1055                                 ~TTM_PL_MASK_MEMTYPE);
1056
1057                 if (mem_type == TTM_PL_SYSTEM)
1058                         break;
1059
1060                 if (man->has_type && man->use_type) {
1061                         type_found = true;
1062                         ret = (*man->func->get_node)(man, bo, placement, mem);
1063                         if (unlikely(ret))
1064                                 return ret;
1065                 }
1066                 if (mem->mm_node)
1067                         break;
1068         }
1069
1070         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1071                 mem->mem_type = mem_type;
1072                 mem->placement = cur_flags;
1073                 return 0;
1074         }
1075
1076         if (!type_found)
1077                 return -EINVAL;
1078
1079         for (i = 0; i < placement->num_busy_placement; ++i) {
1080                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1081                                                 &mem_type);
1082                 if (ret)
1083                         return ret;
1084                 man = &bdev->man[mem_type];
1085                 if (!man->has_type)
1086                         continue;
1087                 if (!ttm_bo_mt_compatible(man,
1088                                                 mem_type,
1089                                                 placement->busy_placement[i],
1090                                                 &cur_flags))
1091                         continue;
1092
1093                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1094                                                   cur_flags);
1095                 /*
1096                  * Use the access and other non-mapping-related flag bits from
1097                  * the memory placement flags to the current flags
1098                  */
1099                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1100                                 ~TTM_PL_MASK_MEMTYPE);
1101
1102
1103                 if (mem_type == TTM_PL_SYSTEM) {
1104                         mem->mem_type = mem_type;
1105                         mem->placement = cur_flags;
1106                         mem->mm_node = NULL;
1107                         return 0;
1108                 }
1109
1110                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1111                                                 interruptible, no_wait_gpu);
1112                 if (ret == 0 && mem->mm_node) {
1113                         mem->placement = cur_flags;
1114                         return 0;
1115                 }
1116                 if (ret == -ERESTARTSYS)
1117                         has_erestartsys = true;
1118         }
1119         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1120         return ret;
1121 }
1122 EXPORT_SYMBOL(ttm_bo_mem_space);
1123
1124 static
1125 int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1126                         struct ttm_placement *placement,
1127                         bool interruptible,
1128                         bool no_wait_gpu)
1129 {
1130         int ret = 0;
1131         struct ttm_mem_reg mem;
1132         struct ttm_bo_device *bdev = bo->bdev;
1133
1134         BUG_ON(!ttm_bo_is_reserved(bo));
1135
1136         /*
1137          * FIXME: It's possible to pipeline buffer moves.
1138          * Have the driver move function wait for idle when necessary,
1139          * instead of doing it here.
1140          */
1141         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1142         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1143         lockmgr(&bdev->fence_lock, LK_RELEASE);
1144         if (ret)
1145                 return ret;
1146         mem.num_pages = bo->num_pages;
1147         mem.size = mem.num_pages << PAGE_SHIFT;
1148         mem.page_alignment = bo->mem.page_alignment;
1149         mem.bus.io_reserved_vm = false;
1150         mem.bus.io_reserved_count = 0;
1151         /*
1152          * Determine where to move the buffer.
1153          */
1154         ret = ttm_bo_mem_space(bo, placement, &mem,
1155                                interruptible, no_wait_gpu);
1156         if (ret)
1157                 goto out_unlock;
1158         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1159                                      interruptible, no_wait_gpu);
1160 out_unlock:
1161         if (ret && mem.mm_node)
1162                 ttm_bo_mem_put(bo, &mem);
1163         return ret;
1164 }
1165
1166 static int ttm_bo_mem_compat(struct ttm_placement *placement,
1167                              struct ttm_mem_reg *mem)
1168 {
1169         int i;
1170
1171         if (mem->mm_node && placement->lpfn != 0 &&
1172             (mem->start < placement->fpfn ||
1173              mem->start + mem->num_pages > placement->lpfn))
1174                 return -1;
1175
1176         for (i = 0; i < placement->num_placement; i++) {
1177                 if ((placement->placement[i] & mem->placement &
1178                         TTM_PL_MASK_CACHING) &&
1179                         (placement->placement[i] & mem->placement &
1180                         TTM_PL_MASK_MEM))
1181                         return i;
1182         }
1183         return -1;
1184 }
1185
1186 int ttm_bo_validate(struct ttm_buffer_object *bo,
1187                         struct ttm_placement *placement,
1188                         bool interruptible,
1189                         bool no_wait_gpu)
1190 {
1191         int ret;
1192
1193         BUG_ON(!ttm_bo_is_reserved(bo));
1194         /* Check that range is valid */
1195         if (placement->lpfn || placement->fpfn)
1196                 if (placement->fpfn > placement->lpfn ||
1197                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1198                         return -EINVAL;
1199         /*
1200          * Check whether we need to move buffer.
1201          */
1202         ret = ttm_bo_mem_compat(placement, &bo->mem);
1203         if (ret < 0) {
1204                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1205                                          no_wait_gpu);
1206                 if (ret)
1207                         return ret;
1208         } else {
1209                 /*
1210                  * Use the access and other non-mapping-related flag bits from
1211                  * the compatible memory placement flags to the active flags
1212                  */
1213                 ttm_flag_masked(&bo->mem.placement, placement->placement[ret],
1214                                 ~TTM_PL_MASK_MEMTYPE);
1215         }
1216         /*
1217          * We might need to add a TTM.
1218          */
1219         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1220                 ret = ttm_bo_add_ttm(bo, true);
1221                 if (ret)
1222                         return ret;
1223         }
1224         return 0;
1225 }
1226 EXPORT_SYMBOL(ttm_bo_validate);
1227
1228 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1229                                 struct ttm_placement *placement)
1230 {
1231         BUG_ON((placement->fpfn || placement->lpfn) &&
1232                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1233
1234         return 0;
1235 }
1236
1237 int ttm_bo_init(struct ttm_bo_device *bdev,
1238                 struct ttm_buffer_object *bo,
1239                 unsigned long size,
1240                 enum ttm_bo_type type,
1241                 struct ttm_placement *placement,
1242                 uint32_t page_alignment,
1243                 bool interruptible,
1244                 struct vm_object *persistent_swap_storage,
1245                 size_t acc_size,
1246                 struct sg_table *sg,
1247                 void (*destroy) (struct ttm_buffer_object *))
1248 {
1249         int ret = 0;
1250         unsigned long num_pages;
1251         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1252
1253         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1254         if (ret) {
1255                 kprintf("[TTM] Out of kernel memory\n");
1256                 if (destroy)
1257                         (*destroy)(bo);
1258                 else
1259                         kfree(bo);
1260                 return -ENOMEM;
1261         }
1262
1263         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1264         if (num_pages == 0) {
1265                 kprintf("[TTM] Illegal buffer object size\n");
1266                 if (destroy)
1267                         (*destroy)(bo);
1268                 else
1269                         kfree(bo);
1270                 ttm_mem_global_free(mem_glob, acc_size);
1271                 return -EINVAL;
1272         }
1273         bo->destroy = destroy;
1274
1275         kref_init(&bo->kref);
1276         kref_init(&bo->list_kref);
1277         atomic_set(&bo->cpu_writers, 0);
1278         atomic_set(&bo->reserved, 1);
1279         init_waitqueue_head(&bo->event_queue);
1280         INIT_LIST_HEAD(&bo->lru);
1281         INIT_LIST_HEAD(&bo->ddestroy);
1282         INIT_LIST_HEAD(&bo->swap);
1283         INIT_LIST_HEAD(&bo->io_reserve_lru);
1284         /*bzero(&bo->vm_rb, sizeof(bo->vm_rb));*/
1285         bo->bdev = bdev;
1286         bo->glob = bdev->glob;
1287         bo->type = type;
1288         bo->num_pages = num_pages;
1289         bo->mem.size = num_pages << PAGE_SHIFT;
1290         bo->mem.mem_type = TTM_PL_SYSTEM;
1291         bo->mem.num_pages = bo->num_pages;
1292         bo->mem.mm_node = NULL;
1293         bo->mem.page_alignment = page_alignment;
1294         bo->mem.bus.io_reserved_vm = false;
1295         bo->mem.bus.io_reserved_count = 0;
1296         bo->priv_flags = 0;
1297         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1298         bo->seq_valid = false;
1299         bo->persistent_swap_storage = persistent_swap_storage;
1300         bo->acc_size = acc_size;
1301         bo->sg = sg;
1302         atomic_inc(&bo->glob->bo_count);
1303
1304         /*
1305          * Mirror ref from kref_init() for list_kref.
1306          */
1307         set_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
1308
1309         ret = ttm_bo_check_placement(bo, placement);
1310         if (unlikely(ret != 0))
1311                 goto out_err;
1312
1313         /*
1314          * For ttm_bo_type_device buffers, allocate
1315          * address space from the device.
1316          */
1317         if (bo->type == ttm_bo_type_device ||
1318             bo->type == ttm_bo_type_sg) {
1319                 ret = ttm_bo_setup_vm(bo);
1320                 if (ret)
1321                         goto out_err;
1322         }
1323
1324         ret = ttm_bo_validate(bo, placement, interruptible, false);
1325         if (ret)
1326                 goto out_err;
1327
1328         ttm_bo_unreserve(bo);
1329         return 0;
1330
1331 out_err:
1332         ttm_bo_unreserve(bo);
1333         ttm_bo_unref(&bo);
1334
1335         return ret;
1336 }
1337 EXPORT_SYMBOL(ttm_bo_init);
1338
1339 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1340                        unsigned long bo_size,
1341                        unsigned struct_size)
1342 {
1343         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1344         size_t size = 0;
1345
1346         size += ttm_round_pot(struct_size);
1347         size += PAGE_ALIGN(npages * sizeof(void *));
1348         size += ttm_round_pot(sizeof(struct ttm_tt));
1349         return size;
1350 }
1351 EXPORT_SYMBOL(ttm_bo_acc_size);
1352
1353 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1354                            unsigned long bo_size,
1355                            unsigned struct_size)
1356 {
1357         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1358         size_t size = 0;
1359
1360         size += ttm_round_pot(struct_size);
1361         size += PAGE_ALIGN(npages * sizeof(void *));
1362         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1363         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1364         return size;
1365 }
1366 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1367
1368 int ttm_bo_create(struct ttm_bo_device *bdev,
1369                         unsigned long size,
1370                         enum ttm_bo_type type,
1371                         struct ttm_placement *placement,
1372                         uint32_t page_alignment,
1373                         bool interruptible,
1374                         struct vm_object *persistent_swap_storage,
1375                         struct ttm_buffer_object **p_bo)
1376 {
1377         struct ttm_buffer_object *bo;
1378         size_t acc_size;
1379         int ret;
1380
1381         *p_bo = NULL;
1382         bo = kmalloc(sizeof(*bo), M_DRM, M_WAITOK | M_ZERO);
1383         if (unlikely(bo == NULL))
1384                 return -ENOMEM;
1385
1386         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1387         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1388                           interruptible, persistent_swap_storage, acc_size,
1389                           NULL, NULL);
1390         if (likely(ret == 0))
1391                 *p_bo = bo;
1392
1393         return ret;
1394 }
1395 EXPORT_SYMBOL(ttm_bo_create);
1396
1397 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1398                                         unsigned mem_type, bool allow_errors)
1399 {
1400         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1401         struct ttm_bo_global *glob = bdev->glob;
1402         int ret;
1403
1404         /*
1405          * Can't use standard list traversal since we're unlocking.
1406          */
1407
1408         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1409         while (!list_empty(&man->lru)) {
1410                 lockmgr(&glob->lru_lock, LK_RELEASE);
1411                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1412                 if (ret) {
1413                         if (allow_errors) {
1414                                 return ret;
1415                         } else {
1416                                 kprintf("[TTM] Cleanup eviction failed\n");
1417                         }
1418                 }
1419                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1420         }
1421         lockmgr(&glob->lru_lock, LK_RELEASE);
1422         return 0;
1423 }
1424
1425 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1426 {
1427         struct ttm_mem_type_manager *man;
1428         int ret = -EINVAL;
1429
1430         if (mem_type >= TTM_NUM_MEM_TYPES) {
1431                 kprintf("[TTM] Illegal memory type %d\n", mem_type);
1432                 return ret;
1433         }
1434         man = &bdev->man[mem_type];
1435
1436         if (!man->has_type) {
1437                 kprintf("[TTM] Trying to take down uninitialized memory manager type %u\n",
1438                        mem_type);
1439                 return ret;
1440         }
1441
1442         man->use_type = false;
1443         man->has_type = false;
1444
1445         ret = 0;
1446         if (mem_type > 0) {
1447                 ttm_bo_force_list_clean(bdev, mem_type, false);
1448
1449                 ret = (*man->func->takedown)(man);
1450         }
1451
1452         return ret;
1453 }
1454 EXPORT_SYMBOL(ttm_bo_clean_mm);
1455
1456 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1457 {
1458         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1459
1460         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1461                 kprintf("[TTM] Illegal memory manager memory type %u\n", mem_type);
1462                 return -EINVAL;
1463         }
1464
1465         if (!man->has_type) {
1466                 kprintf("[TTM] Memory type %u has not been initialized\n", mem_type);
1467                 return 0;
1468         }
1469
1470         return ttm_bo_force_list_clean(bdev, mem_type, true);
1471 }
1472 EXPORT_SYMBOL(ttm_bo_evict_mm);
1473
1474 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1475                         unsigned long p_size)
1476 {
1477         int ret = -EINVAL;
1478         struct ttm_mem_type_manager *man;
1479
1480         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1481         man = &bdev->man[type];
1482         BUG_ON(man->has_type);
1483         man->io_reserve_fastpath = true;
1484         man->use_io_reserve_lru = false;
1485         lockinit(&man->io_reserve_mutex, "ttmman", 0, LK_CANRECURSE);
1486         INIT_LIST_HEAD(&man->io_reserve_lru);
1487
1488         ret = bdev->driver->init_mem_type(bdev, type, man);
1489         if (ret)
1490                 return ret;
1491         man->bdev = bdev;
1492
1493         ret = 0;
1494         if (type != TTM_PL_SYSTEM) {
1495                 ret = (*man->func->init)(man, p_size);
1496                 if (ret)
1497                         return ret;
1498         }
1499         man->has_type = true;
1500         man->use_type = true;
1501         man->size = p_size;
1502
1503         INIT_LIST_HEAD(&man->lru);
1504
1505         return 0;
1506 }
1507 EXPORT_SYMBOL(ttm_bo_init_mm);
1508
1509 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob)
1510 {
1511         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1512         vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1513         glob->dummy_read_page = NULL;
1514         /*
1515         vm_page_free(glob->dummy_read_page);
1516         */
1517 }
1518
1519 void ttm_bo_global_release(struct drm_global_reference *ref)
1520 {
1521         struct ttm_bo_global *glob = ref->object;
1522
1523         if (refcount_release(&glob->kobj_ref))
1524                 ttm_bo_global_kobj_release(glob);
1525 }
1526 EXPORT_SYMBOL(ttm_bo_global_release);
1527
1528 int ttm_bo_global_init(struct drm_global_reference *ref)
1529 {
1530         struct ttm_bo_global_ref *bo_ref =
1531                 container_of(ref, struct ttm_bo_global_ref, ref);
1532         struct ttm_bo_global *glob = ref->object;
1533         int ret;
1534
1535         lockinit(&glob->device_list_mutex, "ttmdlm", 0, LK_CANRECURSE);
1536         lockinit(&glob->lru_lock, "ttmlru", 0, LK_CANRECURSE);
1537         glob->mem_glob = bo_ref->mem_glob;
1538         glob->dummy_read_page = vm_page_alloc_contig(
1539             0, VM_MAX_ADDRESS, PAGE_SIZE, 0, 1*PAGE_SIZE, VM_MEMATTR_UNCACHEABLE);
1540
1541         if (unlikely(glob->dummy_read_page == NULL)) {
1542                 ret = -ENOMEM;
1543                 goto out_no_drp;
1544         }
1545
1546         INIT_LIST_HEAD(&glob->swap_lru);
1547         INIT_LIST_HEAD(&glob->device_list);
1548
1549         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1550         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1551         if (unlikely(ret != 0)) {
1552                 kprintf("[TTM] Could not register buffer object swapout\n");
1553                 goto out_no_shrink;
1554         }
1555
1556         atomic_set(&glob->bo_count, 0);
1557
1558         refcount_init(&glob->kobj_ref, 1);
1559         return (0);
1560
1561 out_no_shrink:
1562         vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1563         glob->dummy_read_page = NULL;
1564         /*
1565         vm_page_free(glob->dummy_read_page);
1566         */
1567 out_no_drp:
1568         kfree(glob);
1569         return ret;
1570 }
1571 EXPORT_SYMBOL(ttm_bo_global_init);
1572
1573
1574 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1575 {
1576         int ret = 0;
1577         unsigned i = TTM_NUM_MEM_TYPES;
1578         struct ttm_mem_type_manager *man;
1579         struct ttm_bo_global *glob = bdev->glob;
1580
1581         while (i--) {
1582                 man = &bdev->man[i];
1583                 if (man->has_type) {
1584                         man->use_type = false;
1585                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1586                                 ret = -EBUSY;
1587                                 kprintf("[TTM] DRM memory manager type %d is not clean\n",
1588                                        i);
1589                         }
1590                         man->has_type = false;
1591                 }
1592         }
1593
1594         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1595         list_del(&bdev->device_list);
1596         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1597
1598         cancel_delayed_work_sync(&bdev->wq);
1599
1600         while (ttm_bo_delayed_delete(bdev, true))
1601                 ;
1602
1603         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1604         if (list_empty(&bdev->ddestroy))
1605                 TTM_DEBUG("Delayed destroy list was clean\n");
1606
1607         if (list_empty(&bdev->man[0].lru))
1608                 TTM_DEBUG("Swap list was clean\n");
1609         lockmgr(&glob->lru_lock, LK_RELEASE);
1610
1611         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1612         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1613         drm_mm_takedown(&bdev->addr_space_mm);
1614         lockmgr(&bdev->vm_lock, LK_RELEASE);
1615
1616         return ret;
1617 }
1618 EXPORT_SYMBOL(ttm_bo_device_release);
1619
1620 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1621                        struct ttm_bo_global *glob,
1622                        struct ttm_bo_driver *driver,
1623                        uint64_t file_page_offset,
1624                        bool need_dma32)
1625 {
1626         int ret = -EINVAL;
1627
1628         lockinit(&bdev->vm_lock, "ttmvml", 0, LK_CANRECURSE);
1629         bdev->driver = driver;
1630
1631         memset(bdev->man, 0, sizeof(bdev->man));
1632
1633         /*
1634          * Initialize the system memory buffer type.
1635          * Other types need to be driver / IOCTL initialized.
1636          */
1637         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1638         if (unlikely(ret != 0))
1639                 goto out_no_sys;
1640
1641         RB_INIT(&bdev->addr_space_rb);
1642         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1643         if (unlikely(ret != 0))
1644                 goto out_no_addr_mm;
1645
1646         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1647         INIT_LIST_HEAD(&bdev->ddestroy);
1648         bdev->dev_mapping = NULL;
1649         bdev->glob = glob;
1650         bdev->need_dma32 = need_dma32;
1651         bdev->val_seq = 0;
1652         lockinit(&bdev->fence_lock, "ttmfence", 0, LK_CANRECURSE);
1653         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1654         list_add_tail(&bdev->device_list, &glob->device_list);
1655         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1656
1657         return 0;
1658 out_no_addr_mm:
1659         ttm_bo_clean_mm(bdev, 0);
1660 out_no_sys:
1661         return ret;
1662 }
1663 EXPORT_SYMBOL(ttm_bo_device_init);
1664
1665 /*
1666  * buffer object vm functions.
1667  */
1668
1669 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1670 {
1671         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1672
1673         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1674                 if (mem->mem_type == TTM_PL_SYSTEM)
1675                         return false;
1676
1677                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1678                         return false;
1679
1680                 if (mem->placement & TTM_PL_FLAG_CACHED)
1681                         return false;
1682         }
1683         return true;
1684 }
1685
1686 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1687 {
1688
1689         ttm_bo_release_mmap(bo);
1690         ttm_mem_io_free_vm(bo);
1691 }
1692
1693 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1694 {
1695         struct ttm_bo_device *bdev = bo->bdev;
1696         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1697
1698         ttm_mem_io_lock(man, false);
1699         ttm_bo_unmap_virtual_locked(bo);
1700         ttm_mem_io_unlock(man);
1701 }
1702
1703
1704 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1705
1706 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1707 {
1708         struct ttm_bo_device *bdev = bo->bdev;
1709
1710         /* The caller acquired bdev->vm_lock. */
1711         RB_INSERT(ttm_bo_device_buffer_objects, &bdev->addr_space_rb, bo);
1712 }
1713
1714 /**
1715  * ttm_bo_setup_vm:
1716  *
1717  * @bo: the buffer to allocate address space for
1718  *
1719  * Allocate address space in the drm device so that applications
1720  * can mmap the buffer and access the contents. This only
1721  * applies to ttm_bo_type_device objects as others are not
1722  * placed in the drm device address space.
1723  */
1724
1725 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1726 {
1727         struct ttm_bo_device *bdev = bo->bdev;
1728         int ret;
1729
1730 retry_pre_get:
1731         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1732         if (unlikely(ret != 0))
1733                 return ret;
1734
1735         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1736         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1737                                          bo->mem.num_pages, 0, 0);
1738
1739         if (unlikely(bo->vm_node == NULL)) {
1740                 ret = -ENOMEM;
1741                 goto out_unlock;
1742         }
1743
1744         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1745                                               bo->mem.num_pages, 0);
1746
1747         if (unlikely(bo->vm_node == NULL)) {
1748                 lockmgr(&bdev->vm_lock, LK_RELEASE);
1749                 goto retry_pre_get;
1750         }
1751
1752         ttm_bo_vm_insert_rb(bo);
1753         lockmgr(&bdev->vm_lock, LK_RELEASE);
1754         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1755
1756         return 0;
1757 out_unlock:
1758         lockmgr(&bdev->vm_lock, LK_RELEASE);
1759         return ret;
1760 }
1761
1762 int ttm_bo_wait(struct ttm_buffer_object *bo,
1763                 bool lazy, bool interruptible, bool no_wait)
1764 {
1765         struct ttm_bo_driver *driver = bo->bdev->driver;
1766         struct ttm_bo_device *bdev = bo->bdev;
1767         void *sync_obj;
1768         int ret = 0;
1769
1770         if (likely(bo->sync_obj == NULL))
1771                 return 0;
1772
1773         while (bo->sync_obj) {
1774
1775                 if (driver->sync_obj_signaled(bo->sync_obj)) {
1776                         void *tmp_obj = bo->sync_obj;
1777                         bo->sync_obj = NULL;
1778                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1779                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1780                         driver->sync_obj_unref(&tmp_obj);
1781                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1782                         continue;
1783                 }
1784
1785                 if (no_wait)
1786                         return -EBUSY;
1787
1788                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1789                 lockmgr(&bdev->fence_lock, LK_RELEASE);
1790                 ret = driver->sync_obj_wait(sync_obj,
1791                                             lazy, interruptible);
1792                 if (unlikely(ret != 0)) {
1793                         driver->sync_obj_unref(&sync_obj);
1794                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1795                         return ret;
1796                 }
1797                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1798                 if (likely(bo->sync_obj == sync_obj)) {
1799                         void *tmp_obj = bo->sync_obj;
1800                         bo->sync_obj = NULL;
1801                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1802                                   &bo->priv_flags);
1803                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1804                         driver->sync_obj_unref(&sync_obj);
1805                         driver->sync_obj_unref(&tmp_obj);
1806                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1807                 } else {
1808                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1809                         driver->sync_obj_unref(&sync_obj);
1810                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1811                 }
1812         }
1813         return 0;
1814 }
1815 EXPORT_SYMBOL(ttm_bo_wait);
1816
1817 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1818 {
1819         struct ttm_bo_device *bdev = bo->bdev;
1820         int ret = 0;
1821
1822         /*
1823          * Using ttm_bo_reserve makes sure the lru lists are updated.
1824          */
1825
1826         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1827         if (unlikely(ret != 0))
1828                 return ret;
1829         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1830         ret = ttm_bo_wait(bo, false, true, no_wait);
1831         lockmgr(&bdev->fence_lock, LK_RELEASE);
1832         if (likely(ret == 0))
1833                 atomic_inc(&bo->cpu_writers);
1834         ttm_bo_unreserve(bo);
1835         return ret;
1836 }
1837 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1838
1839 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1840 {
1841         atomic_dec(&bo->cpu_writers);
1842 }
1843 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1844
1845 /**
1846  * A buffer object shrink method that tries to swap out the first
1847  * buffer object on the bo_global::swap_lru list.
1848  */
1849
1850 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1851 {
1852         struct ttm_bo_global *glob =
1853             container_of(shrink, struct ttm_bo_global, shrink);
1854         struct ttm_buffer_object *bo;
1855         int ret = -EBUSY;
1856         int put_count;
1857         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1858
1859         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1860         list_for_each_entry(bo, &glob->swap_lru, swap) {
1861                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1862                 if (!ret)
1863                         break;
1864         }
1865
1866         if (ret) {
1867                 lockmgr(&glob->lru_lock, LK_RELEASE);
1868                 return ret;
1869         }
1870
1871         kref_get(&bo->list_kref);
1872
1873         if (!list_empty(&bo->ddestroy)) {
1874                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1875                 kref_put(&bo->list_kref, ttm_bo_release_list);
1876                 return ret;
1877         }
1878
1879         put_count = ttm_bo_del_from_lru(bo);
1880         lockmgr(&glob->lru_lock, LK_RELEASE);
1881
1882         ttm_bo_list_ref_sub(bo, put_count, true);
1883
1884         /**
1885          * Wait for GPU, then move to system cached.
1886          */
1887
1888         lockmgr(&bo->bdev->fence_lock, LK_EXCLUSIVE);
1889         ret = ttm_bo_wait(bo, false, false, false);
1890         lockmgr(&bo->bdev->fence_lock, LK_RELEASE);
1891
1892         if (unlikely(ret != 0))
1893                 goto out;
1894
1895         if ((bo->mem.placement & swap_placement) != swap_placement) {
1896                 struct ttm_mem_reg evict_mem;
1897
1898                 evict_mem = bo->mem;
1899                 evict_mem.mm_node = NULL;
1900                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1901                 evict_mem.mem_type = TTM_PL_SYSTEM;
1902
1903                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1904                                              false, false);
1905                 if (unlikely(ret != 0))
1906                         goto out;
1907         }
1908
1909         ttm_bo_unmap_virtual(bo);
1910
1911         /**
1912          * Swap out. Buffer will be swapped in again as soon as
1913          * anyone tries to access a ttm page.
1914          */
1915
1916         if (bo->bdev->driver->swap_notify)
1917                 bo->bdev->driver->swap_notify(bo);
1918
1919         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1920 out:
1921
1922         /**
1923          *
1924          * Unreserve without putting on LRU to avoid swapping out an
1925          * already swapped buffer.
1926          */
1927
1928         ttm_bo_unreserve_core(bo);
1929         kref_put(&bo->list_kref, ttm_bo_release_list);
1930         return ret;
1931 }
1932
1933 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1934 {
1935         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1936                 ;
1937 }
1938 EXPORT_SYMBOL(ttm_bo_swapout_all);