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