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_ticket,
 194                           struct ww_acquire_ctx *ticket)
 195 {
 196         int ret;
 197
 198         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 199                 /**
 200                  * Deadlock avoidance for multi-bo reserving.
 201                  */
 202                 if (use_ticket && bo->seq_valid) {
 203                         /**
 204                          * We've already reserved this one.
 205                          */
 206                         if (unlikely(ticket->stamp == bo->val_seq))
 207                                 return -EDEADLK;
 208                         /**
 209                          * Already reserved by a thread that will not back
 210                          * off for us. We need to back off.
 211                          */
 212                         if (unlikely(ticket->stamp - bo->val_seq <= LONG_MAX))
 213                                 return -EAGAIN;
 214                 }
 215
 216                 if (no_wait)
 217                         return -EBUSY;
 218
 219                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 220
 221                 if (unlikely(ret))
 222                         return ret;
 223         }
 224
 225         if (use_ticket) {
 226                 bool wake_up = false;
 227
 228                 /**
 229                  * Wake up waiters that may need to recheck for deadlock,
 230                  * if we decreased the sequence number.
 231                  */
 232                 if (unlikely((bo->val_seq - ticket->stamp <= LONG_MAX)
 233                              || !bo->seq_valid))
 234                         wake_up = true;
 235
 236                 /*
 237                  * In the worst case with memory ordering these values can be
 238                  * seen in the wrong order. However since we call wake_up_all
 239                  * in that case, this will hopefully not pose a problem,
 240                  * and the worst case would only cause someone to accidentally
 241                  * hit -EAGAIN in ttm_bo_reserve when they see old value of
 242                  * val_seq. However this would only happen if seq_valid was
 243                  * written before val_seq was, and just means some slightly
 244                  * increased cpu usage
 245                  */
 246                 bo->val_seq = ticket->stamp;
 247                 bo->seq_valid = true;
 248                 if (wake_up)
 249                         wake_up_all(&bo->event_queue);
 250         } else {
 251                 bo->seq_valid = false;
 252         }
 253
 254         return 0;
 255 }
 256 EXPORT_SYMBOL(ttm_bo_reserve);
 257
 258 static void ttm_bo_ref_bug(struct kref *list_kref)
 259 {
 260         BUG();
 261 }
 262
 263 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 264                          bool never_free)
 265 {
 266         kref_sub(&bo->list_kref, count,
 267                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 268 }
 269
 270 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 271                    bool interruptible,
 272                    bool no_wait, bool use_ticket,
 273                    struct ww_acquire_ctx *ticket)
 274 {
 275         struct ttm_bo_global *glob = bo->glob;
 276         int put_count = 0;
 277         int ret;
 278
 279         ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_ticket,
 280                                     ticket);
 281         if (likely(ret == 0)) {
 282                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 283                 put_count = ttm_bo_del_from_lru(bo);
 284                 lockmgr(&glob->lru_lock, LK_RELEASE);
 285                 ttm_bo_list_ref_sub(bo, put_count, true);
 286         }
 287
 288         return ret;
 289 }
 290
 291 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
 292                                   bool interruptible,
 293                                   struct ww_acquire_ctx *ticket)
 294 {
 295         bool wake_up = false;
 296         int ret;
 297
 298         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 299                 WARN_ON(bo->seq_valid && ticket->stamp == bo->val_seq);
 300
 301                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 302
 303                 if (unlikely(ret))
 304                         return ret;
 305         }
 306
 307         if (bo->val_seq - ticket->stamp < LONG_MAX || !bo->seq_valid)
 308                 wake_up = true;
 309
 310         /**
 311          * Wake up waiters that may need to recheck for deadlock,
 312          * if we decreased the sequence number.
 313          */
 314         bo->val_seq = ticket->stamp;
 315         bo->seq_valid = true;
 316         if (wake_up)
 317                 wake_up_all(&bo->event_queue);
 318
 319         return 0;
 320 }
 321
 322 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 323                             bool interruptible, struct ww_acquire_ctx *ticket)
 324 {
 325         struct ttm_bo_global *glob = bo->glob;
 326         int put_count, ret;
 327
 328         ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, ticket);
 329         if (likely(!ret)) {
 330                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 331                 put_count = ttm_bo_del_from_lru(bo);
 332                 lockmgr(&glob->lru_lock, LK_RELEASE);
 333                 ttm_bo_list_ref_sub(bo, put_count, true);
 334         }
 335         return ret;
 336 }
 337 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
 338
 339 /*
 340  * Must interlock with event_queue to avoid race against
 341  * wait_event_common() which can cause wait_event_common()
 342  * to become stuck.
 343  */
 344 static void
 345 ttm_bo_unreserve_core(struct ttm_buffer_object *bo)
 346 {
 347         lockmgr(&bo->event_queue.lock, LK_EXCLUSIVE);
 348         atomic_set(&bo->reserved, 0);
 349         lockmgr(&bo->event_queue.lock, LK_RELEASE);
 350         wake_up_all(&bo->event_queue);
 351 }
 352
 353 void ttm_bo_unreserve_ticket_locked(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
 354 {
 355         ttm_bo_add_to_lru(bo);
 356         ttm_bo_unreserve_core(bo);
 357 }
 358
 359 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 360 {
 361         struct ttm_bo_global *glob = bo->glob;
 362
 363         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 364         ttm_bo_unreserve_ticket_locked(bo, NULL);
 365         lockmgr(&glob->lru_lock, LK_RELEASE);
 366 }
 367 EXPORT_SYMBOL(ttm_bo_unreserve);
 368
 369 void ttm_bo_unreserve_ticket(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
 370 {
 371         struct ttm_bo_global *glob = bo->glob;
 372
 373         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 374         ttm_bo_unreserve_ticket_locked(bo, ticket);
 375         lockmgr(&glob->lru_lock, LK_RELEASE);
 376 }
 377 EXPORT_SYMBOL(ttm_bo_unreserve_ticket);
 378
 379 /*
 380  * Call bo->mutex locked.
 381  */
 382 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 383 {
 384         struct ttm_bo_device *bdev = bo->bdev;
 385         struct ttm_bo_global *glob = bo->glob;
 386         int ret = 0;
 387         uint32_t page_flags = 0;
 388
 389         TTM_ASSERT_LOCKED(&bo->mutex);
 390         bo->ttm = NULL;
 391
 392         if (bdev->need_dma32)
 393                 page_flags |= TTM_PAGE_FLAG_DMA32;
 394
 395         switch (bo->type) {
 396         case ttm_bo_type_device:
 397                 if (zero_alloc)
 398                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 399         case ttm_bo_type_kernel:
 400                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 401                                                       page_flags, glob->dummy_read_page);
 402                 if (unlikely(bo->ttm == NULL))
 403                         ret = -ENOMEM;
 404                 break;
 405         case ttm_bo_type_sg:
 406                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 407                                                       page_flags | TTM_PAGE_FLAG_SG,
 408                                                       glob->dummy_read_page);
 409                 if (unlikely(bo->ttm == NULL)) {
 410                         ret = -ENOMEM;
 411                         break;
 412                 }
 413                 bo->ttm->sg = bo->sg;
 414                 break;
 415         default:
 416                 kprintf("[TTM] Illegal buffer object type\n");
 417                 ret = -EINVAL;
 418                 break;
 419         }
 420
 421         return ret;
 422 }
 423
 424 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 425                                   struct ttm_mem_reg *mem,
 426                                   bool evict, bool interruptible,
 427                                   bool no_wait_gpu)
 428 {
 429         struct ttm_bo_device *bdev = bo->bdev;
 430         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 431         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 432         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 433         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 434         int ret = 0;
 435
 436         if (old_is_pci || new_is_pci ||
 437             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 438                 ret = ttm_mem_io_lock(old_man, true);
 439                 if (unlikely(ret != 0))
 440                         goto out_err;
 441                 ttm_bo_unmap_virtual_locked(bo);
 442                 ttm_mem_io_unlock(old_man);
 443         }
 444
 445         /*
 446          * Create and bind a ttm if required.
 447          */
 448
 449         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 450                 if (bo->ttm == NULL) {
 451                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 452                         ret = ttm_bo_add_ttm(bo, zero);
 453                         if (ret)
 454                                 goto out_err;
 455                 }
 456
 457                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 458                 if (ret)
 459                         goto out_err;
 460
 461                 if (mem->mem_type != TTM_PL_SYSTEM) {
 462                         ret = ttm_tt_bind(bo->ttm, mem);
 463                         if (ret)
 464                                 goto out_err;
 465                 }
 466
 467                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 468                         if (bdev->driver->move_notify)
 469                                 bdev->driver->move_notify(bo, mem);
 470                         bo->mem = *mem;
 471                         mem->mm_node = NULL;
 472                         goto moved;
 473                 }
 474         }
 475
 476         if (bdev->driver->move_notify)
 477                 bdev->driver->move_notify(bo, mem);
 478
 479         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 480             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 481                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 482         else if (bdev->driver->move)
 483                 ret = bdev->driver->move(bo, evict, interruptible,
 484                                          no_wait_gpu, mem);
 485         else
 486                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 487
 488         if (ret) {
 489                 if (bdev->driver->move_notify) {
 490                         struct ttm_mem_reg tmp_mem = *mem;
 491                         *mem = bo->mem;
 492                         bo->mem = tmp_mem;
 493                         bdev->driver->move_notify(bo, mem);
 494                         bo->mem = *mem;
 495                         *mem = tmp_mem;
 496                 }
 497
 498                 goto out_err;
 499         }
 500
 501 moved:
 502         if (bo->evicted) {
 503                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 504                 if (ret)
 505                         kprintf("[TTM] Can not flush read caches\n");
 506                 bo->evicted = false;
 507         }
 508
 509         if (bo->mem.mm_node) {
 510                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 511                     bdev->man[bo->mem.mem_type].gpu_offset;
 512                 bo->cur_placement = bo->mem.placement;
 513         } else
 514                 bo->offset = 0;
 515
 516         return 0;
 517
 518 out_err:
 519         new_man = &bdev->man[bo->mem.mem_type];
 520         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 521                 ttm_tt_unbind(bo->ttm);
 522                 ttm_tt_destroy(bo->ttm);
 523                 bo->ttm = NULL;
 524         }
 525
 526         return ret;
 527 }
 528
 529 /**
 530  * Call bo::reserved.
 531  * Will release GPU memory type usage on destruction.
 532  * This is the place to put in driver specific hooks to release
 533  * driver private resources.
 534  * Will release the bo::reserved lock.
 535  */
 536
 537 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 538 {
 539         if (bo->bdev->driver->move_notify)
 540                 bo->bdev->driver->move_notify(bo, NULL);
 541
 542         if (bo->ttm) {
 543                 ttm_tt_unbind(bo->ttm);
 544                 ttm_tt_destroy(bo->ttm);
 545                 bo->ttm = NULL;
 546         }
 547         ttm_bo_mem_put(bo, &bo->mem);
 548         ttm_bo_unreserve_core(bo);
 549
 550         /*
 551          * Since the final reference to this bo may not be dropped by
 552          * the current task we have to put a memory barrier here to make
 553          * sure the changes done in this function are always visible.
 554          *
 555          * This function only needs protection against the final kref_put.
 556          */
 557         cpu_mfence();
 558 }
 559
 560 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 561 {
 562         struct ttm_bo_device *bdev = bo->bdev;
 563         struct ttm_bo_global *glob = bo->glob;
 564         struct ttm_bo_driver *driver = bdev->driver;
 565         void *sync_obj = NULL;
 566         int put_count;
 567         int ret;
 568
 569         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 570         ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 571
 572         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 573         (void) ttm_bo_wait(bo, false, false, true);
 574         if (!ret && !bo->sync_obj) {
 575                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 576                 put_count = ttm_bo_del_from_lru(bo);
 577
 578                 lockmgr(&glob->lru_lock, LK_RELEASE);
 579                 ttm_bo_cleanup_memtype_use(bo);
 580
 581                 ttm_bo_list_ref_sub(bo, put_count, true);
 582
 583                 return;
 584         }
 585         if (bo->sync_obj)
 586                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 587         lockmgr(&bdev->fence_lock, LK_RELEASE);
 588
 589         if (!ret) {
 590
 591                 /*
 592                  * Make NO_EVICT bos immediately available to
 593                  * shrinkers, now that they are queued for
 594                  * destruction.
 595                  */
 596                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 597                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 598                         ttm_bo_add_to_lru(bo);
 599                 }
 600
 601                 ttm_bo_unreserve_core(bo);
 602         }
 603
 604         kref_get(&bo->list_kref);
 605         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 606         lockmgr(&glob->lru_lock, LK_RELEASE);
 607
 608         if (sync_obj) {
 609                 driver->sync_obj_flush(sync_obj);
 610                 driver->sync_obj_unref(&sync_obj);
 611         }
 612         schedule_delayed_work(&bdev->wq,
 613                               ((hz / 100) < 1) ? 1 : hz / 100);
 614 }
 615
 616 /**
 617  * function ttm_bo_cleanup_refs_and_unlock
 618  * If bo idle, remove from delayed- and lru lists, and unref.
 619  * If not idle, do nothing.
 620  *
 621  * Must be called with lru_lock and reservation held, this function
 622  * will drop both before returning.
 623  *
 624  * @interruptible         Any sleeps should occur interruptibly.
 625  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 626  */
 627
 628 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 629                                           bool interruptible,
 630                                           bool no_wait_gpu)
 631 {
 632         struct ttm_bo_device *bdev = bo->bdev;
 633         struct ttm_bo_driver *driver = bdev->driver;
 634         struct ttm_bo_global *glob = bo->glob;
 635         int put_count;
 636         int ret;
 637
 638         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 639         ret = ttm_bo_wait(bo, false, false, true);
 640
 641         if (ret && !no_wait_gpu) {
 642                 void *sync_obj;
 643
 644                 /*
 645                  * Take a reference to the fence and unreserve,
 646                  * at this point the buffer should be dead, so
 647                  * no new sync objects can be attached.
 648                  */
 649                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 650                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 651
 652                 ttm_bo_unreserve_core(bo);
 653                 lockmgr(&glob->lru_lock, LK_RELEASE);
 654
 655                 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
 656                 driver->sync_obj_unref(&sync_obj);
 657                 if (ret)
 658                         return ret;
 659
 660                 /*
 661                  * remove sync_obj with ttm_bo_wait, the wait should be
 662                  * finished, and no new wait object should have been added.
 663                  */
 664                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 665                 ret = ttm_bo_wait(bo, false, false, true);
 666                 WARN_ON(ret);
 667                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 668                 if (ret)
 669                         return ret;
 670
 671                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 672                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 673
 674                 /*
 675                  * We raced, and lost, someone else holds the reservation now,
 676                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 677                  *
 678                  * Even if it's not the case, because we finished waiting any
 679                  * delayed destruction would succeed, so just return success
 680                  * here.
 681                  */
 682                 if (ret) {
 683                         lockmgr(&glob->lru_lock, LK_RELEASE);
 684                         return 0;
 685                 }
 686         } else
 687                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 688
 689         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 690                 ttm_bo_unreserve_core(bo);
 691                 lockmgr(&glob->lru_lock, LK_RELEASE);
 692                 return ret;
 693         }
 694
 695         put_count = ttm_bo_del_from_lru(bo);
 696         list_del_init(&bo->ddestroy);
 697         ++put_count;
 698
 699         lockmgr(&glob->lru_lock, LK_RELEASE);
 700         ttm_bo_cleanup_memtype_use(bo);
 701
 702         ttm_bo_list_ref_sub(bo, put_count, true);
 703
 704         return 0;
 705 }
 706
 707 /**
 708  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 709  * encountered buffers.
 710  */
 711
 712 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 713 {
 714         struct ttm_bo_global *glob = bdev->glob;
 715         struct ttm_buffer_object *entry = NULL;
 716         int ret = 0;
 717
 718         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 719         if (list_empty(&bdev->ddestroy))
 720                 goto out_unlock;
 721
 722         entry = list_first_entry(&bdev->ddestroy,
 723                 struct ttm_buffer_object, ddestroy);
 724         kref_get(&entry->list_kref);
 725
 726         for (;;) {
 727                 struct ttm_buffer_object *nentry = NULL;
 728
 729                 if (entry->ddestroy.next != &bdev->ddestroy) {
 730                         nentry = list_first_entry(&entry->ddestroy,
 731                                 struct ttm_buffer_object, ddestroy);
 732                         kref_get(&nentry->list_kref);
 733                 }
 734
 735                 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
 736                 if (remove_all && ret) {
 737                         lockmgr(&glob->lru_lock, LK_RELEASE);
 738                         ret = ttm_bo_reserve_nolru(entry, false, false,
 739                                                    false, 0);
 740                         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 741                 }
 742
 743                 if (!ret)
 744                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 745                                                              !remove_all);
 746                 else
 747                         lockmgr(&glob->lru_lock, LK_RELEASE);
 748
 749                 kref_put(&entry->list_kref, ttm_bo_release_list);
 750                 entry = nentry;
 751
 752                 if (ret || !entry)
 753                         goto out;
 754
 755                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 756                 if (list_empty(&entry->ddestroy))
 757                         break;
 758         }
 759
 760 out_unlock:
 761         lockmgr(&glob->lru_lock, LK_RELEASE);
 762 out:
 763         if (entry)
 764                 kref_put(&entry->list_kref, ttm_bo_release_list);
 765         return ret;
 766 }
 767
 768 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 769 {
 770         struct ttm_bo_device *bdev =
 771             container_of(work, struct ttm_bo_device, wq.work);
 772
 773         if (ttm_bo_delayed_delete(bdev, false)) {
 774                 schedule_delayed_work(&bdev->wq,
 775                                       ((hz / 100) < 1) ? 1 : hz / 100);
 776         }
 777 }
 778
 779 /*
 780  * NOTE: bdev->vm_lock already held on call, this function release it.
 781  */
 782 static void ttm_bo_release(struct kref *kref)
 783 {
 784         struct ttm_buffer_object *bo =
 785             container_of(kref, struct ttm_buffer_object, kref);
 786         struct ttm_bo_device *bdev = bo->bdev;
 787         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 788         int release_active;
 789
 790         if (atomic_read(&bo->kref.refcount) > 0) {
 791                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 792                 return;
 793         }
 794         if (likely(bo->vm_node != NULL)) {
 795                 RB_REMOVE(ttm_bo_device_buffer_objects,
 796                                 &bdev->addr_space_rb, bo);
 797                 drm_mm_put_block(bo->vm_node);
 798                 bo->vm_node = NULL;
 799         }
 800
 801         /*
 802          * Should we clean up our implied list_kref?  Because ttm_bo_release()
 803          * can be called reentrantly due to races (this may not be true any
 804          * more with the lock management changes in the deref), it is possible
 805          * to get here twice, but there's only one list_kref ref to drop and
 806          * in the other path 'bo' can be kfree()d by another thread the
 807          * instant we release our lock.
 808          */
 809         release_active = test_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 810         if (release_active) {
 811                 clear_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 812                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 813                 ttm_mem_io_lock(man, false);
 814                 ttm_mem_io_free_vm(bo);
 815                 ttm_mem_io_unlock(man);
 816                 ttm_bo_cleanup_refs_or_queue(bo);
 817                 kref_put(&bo->list_kref, ttm_bo_release_list);
 818         } else {
 819                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 820         }
 821 }
 822
 823 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 824 {
 825         struct ttm_buffer_object *bo = *p_bo;
 826         struct ttm_bo_device *bdev = bo->bdev;
 827
 828         *p_bo = NULL;
 829         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
 830         if (kref_put(&bo->kref, ttm_bo_release) == 0)
 831                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 832 }
 833 EXPORT_SYMBOL(ttm_bo_unref);
 834
 835 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 836 {
 837         return cancel_delayed_work_sync(&bdev->wq);
 838 }
 839 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 840
 841 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 842 {
 843         if (resched)
 844                 schedule_delayed_work(&bdev->wq,
 845                                       ((hz / 100) < 1) ? 1 : hz / 100);
 846 }
 847 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 848
 849 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 850                         bool no_wait_gpu)
 851 {
 852         struct ttm_bo_device *bdev = bo->bdev;
 853         struct ttm_mem_reg evict_mem;
 854         struct ttm_placement placement;
 855         int ret = 0;
 856
 857         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 858         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 859         lockmgr(&bdev->fence_lock, LK_RELEASE);
 860
 861         if (unlikely(ret != 0)) {
 862                 if (ret != -ERESTARTSYS) {
 863                         pr_err("Failed to expire sync object before buffer eviction\n");
 864                 }
 865                 goto out;
 866         }
 867
 868         BUG_ON(!ttm_bo_is_reserved(bo));
 869
 870         evict_mem = bo->mem;
 871         evict_mem.mm_node = NULL;
 872         evict_mem.bus.io_reserved_vm = false;
 873         evict_mem.bus.io_reserved_count = 0;
 874
 875         placement.fpfn = 0;
 876         placement.lpfn = 0;
 877         placement.num_placement = 0;
 878         placement.num_busy_placement = 0;
 879         bdev->driver->evict_flags(bo, &placement);
 880         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 881                                 no_wait_gpu);
 882         if (ret) {
 883                 if (ret != -ERESTARTSYS) {
 884                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 885                                bo);
 886                         ttm_bo_mem_space_debug(bo, &placement);
 887                 }
 888                 goto out;
 889         }
 890
 891         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 892                                      no_wait_gpu);
 893         if (ret) {
 894                 if (ret != -ERESTARTSYS)
 895                         pr_err("Buffer eviction failed\n");
 896                 ttm_bo_mem_put(bo, &evict_mem);
 897                 goto out;
 898         }
 899         bo->evicted = true;
 900 out:
 901         return ret;
 902 }
 903
 904 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 905                                 uint32_t mem_type,
 906                                 bool interruptible,
 907                                 bool no_wait_gpu)
 908 {
 909         struct ttm_bo_global *glob = bdev->glob;
 910         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 911         struct ttm_buffer_object *bo;
 912         int ret = -EBUSY, put_count;
 913
 914         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 915         list_for_each_entry(bo, &man->lru, lru) {
 916                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 917                 if (!ret)
 918                         break;
 919         }
 920
 921         if (ret) {
 922                 lockmgr(&glob->lru_lock, LK_RELEASE);
 923                 return ret;
 924         }
 925
 926         kref_get(&bo->list_kref);
 927
 928         if (!list_empty(&bo->ddestroy)) {
 929                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 930                                                      no_wait_gpu);
 931                 kref_put(&bo->list_kref, ttm_bo_release_list);
 932                 return ret;
 933         }
 934
 935         put_count = ttm_bo_del_from_lru(bo);
 936         lockmgr(&glob->lru_lock, LK_RELEASE);
 937
 938         BUG_ON(ret != 0);
 939
 940         ttm_bo_list_ref_sub(bo, put_count, true);
 941
 942         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 943         ttm_bo_unreserve(bo);
 944
 945         kref_put(&bo->list_kref, ttm_bo_release_list);
 946         return ret;
 947 }
 948
 949 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 950 {
 951         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 952
 953         if (mem->mm_node)
 954                 (*man->func->put_node)(man, mem);
 955 }
 956 EXPORT_SYMBOL(ttm_bo_mem_put);
 957
 958 /**
 959  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 960  * space, or we've evicted everything and there isn't enough space.
 961  */
 962 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 963                                         uint32_t mem_type,
 964                                         struct ttm_placement *placement,
 965                                         struct ttm_mem_reg *mem,
 966                                         bool interruptible,
 967                                         bool no_wait_gpu)
 968 {
 969         struct ttm_bo_device *bdev = bo->bdev;
 970         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 971         int ret;
 972
 973         do {
 974                 ret = (*man->func->get_node)(man, bo, placement, 0, mem);
 975                 if (unlikely(ret != 0))
 976                         return ret;
 977                 if (mem->mm_node)
 978                         break;
 979                 ret = ttm_mem_evict_first(bdev, mem_type,
 980                                           interruptible, no_wait_gpu);
 981                 if (unlikely(ret != 0))
 982                         return ret;
 983         } while (1);
 984         if (mem->mm_node == NULL)
 985                 return -ENOMEM;
 986         mem->mem_type = mem_type;
 987         return 0;
 988 }
 989
 990 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 991                                       uint32_t cur_placement,
 992                                       uint32_t proposed_placement)
 993 {
 994         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 995         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 996
 997         /**
 998          * Keep current caching if possible.
 999          */
1000
1001         if ((cur_placement & caching) != 0)
1002                 result |= (cur_placement & caching);
1003         else if ((man->default_caching & caching) != 0)
1004                 result |= man->default_caching;
1005         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
1006                 result |= TTM_PL_FLAG_CACHED;
1007         else if ((TTM_PL_FLAG_WC & caching) != 0)
1008                 result |= TTM_PL_FLAG_WC;
1009         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
1010                 result |= TTM_PL_FLAG_UNCACHED;
1011
1012         return result;
1013 }
1014
1015 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1016                                  uint32_t mem_type,
1017                                  uint32_t proposed_placement,
1018                                  uint32_t *masked_placement)
1019 {
1020         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1021
1022         if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)
1023                 return false;
1024
1025         if ((proposed_placement & man->available_caching) == 0)
1026                 return false;
1027
1028         cur_flags |= (proposed_placement & man->available_caching);
1029
1030         *masked_placement = cur_flags;
1031         return true;
1032 }
1033
1034 /**
1035  * Creates space for memory region @mem according to its type.
1036  *
1037  * This function first searches for free space in compatible memory types in
1038  * the priority order defined by the driver.  If free space isn't found, then
1039  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1040  * space.
1041  */
1042 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1043                         struct ttm_placement *placement,
1044                         struct ttm_mem_reg *mem,
1045                         bool interruptible,
1046                         bool no_wait_gpu)
1047 {
1048         struct ttm_bo_device *bdev = bo->bdev;
1049         struct ttm_mem_type_manager *man;
1050         uint32_t mem_type = TTM_PL_SYSTEM;
1051         uint32_t cur_flags = 0;
1052         bool type_found = false;
1053         bool type_ok = false;
1054         bool has_erestartsys = false;
1055         int i, ret;
1056
1057         mem->mm_node = NULL;
1058         for (i = 0; i < placement->num_placement; ++i) {
1059                 ret = ttm_mem_type_from_flags(placement->placement[i],
1060                                                 &mem_type);
1061                 if (ret)
1062                         return ret;
1063                 man = &bdev->man[mem_type];
1064
1065                 type_ok = ttm_bo_mt_compatible(man,
1066                                                 mem_type,
1067                                                 placement->placement[i],
1068                                                 &cur_flags);
1069
1070                 if (!type_ok)
1071                         continue;
1072
1073                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1074                                                   cur_flags);
1075                 /*
1076                  * Use the access and other non-mapping-related flag bits from
1077                  * the memory placement flags to the current flags
1078                  */
1079                 ttm_flag_masked(&cur_flags, placement->placement[i],
1080                                 ~TTM_PL_MASK_MEMTYPE);
1081
1082                 if (mem_type == TTM_PL_SYSTEM)
1083                         break;
1084
1085                 if (man->has_type && man->use_type) {
1086                         type_found = true;
1087                         ret = (*man->func->get_node)(man, bo, placement,
1088                                                      cur_flags, mem);
1089                         if (unlikely(ret))
1090                                 return ret;
1091                 }
1092                 if (mem->mm_node)
1093                         break;
1094         }
1095
1096         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1097                 mem->mem_type = mem_type;
1098                 mem->placement = cur_flags;
1099                 return 0;
1100         }
1101
1102         if (!type_found)
1103                 return -EINVAL;
1104
1105         for (i = 0; i < placement->num_busy_placement; ++i) {
1106                 ret = ttm_mem_type_from_flags(placement->busy_placement[i],
1107                                                 &mem_type);
1108                 if (ret)
1109                         return ret;
1110                 man = &bdev->man[mem_type];
1111                 if (!man->has_type)
1112                         continue;
1113                 if (!ttm_bo_mt_compatible(man,
1114                                                 mem_type,
1115                                                 placement->busy_placement[i],
1116                                                 &cur_flags))
1117                         continue;
1118
1119                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1120                                                   cur_flags);
1121                 /*
1122                  * Use the access and other non-mapping-related flag bits from
1123                  * the memory placement flags to the current flags
1124                  */
1125                 ttm_flag_masked(&cur_flags, placement->busy_placement[i],
1126                                 ~TTM_PL_MASK_MEMTYPE);
1127
1128                 if (mem_type == TTM_PL_SYSTEM) {
1129                         mem->mem_type = mem_type;
1130                         mem->placement = cur_flags;
1131                         mem->mm_node = NULL;
1132                         return 0;
1133                 }
1134
1135                 ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,
1136                                                 interruptible, no_wait_gpu);
1137                 if (ret == 0 && mem->mm_node) {
1138                         mem->placement = cur_flags;
1139                         return 0;
1140                 }
1141                 if (ret == -ERESTARTSYS)
1142                         has_erestartsys = true;
1143         }
1144         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1145         return ret;
1146 }
1147 EXPORT_SYMBOL(ttm_bo_mem_space);
1148
1149 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1150                         struct ttm_placement *placement,
1151                         bool interruptible,
1152                         bool no_wait_gpu)
1153 {
1154         int ret = 0;
1155         struct ttm_mem_reg mem;
1156         struct ttm_bo_device *bdev = bo->bdev;
1157
1158         BUG_ON(!ttm_bo_is_reserved(bo));
1159
1160         /*
1161          * FIXME: It's possible to pipeline buffer moves.
1162          * Have the driver move function wait for idle when necessary,
1163          * instead of doing it here.
1164          */
1165         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1166         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1167         lockmgr(&bdev->fence_lock, LK_RELEASE);
1168         if (ret)
1169                 return ret;
1170         mem.num_pages = bo->num_pages;
1171         mem.size = mem.num_pages << PAGE_SHIFT;
1172         mem.page_alignment = bo->mem.page_alignment;
1173         mem.bus.io_reserved_vm = false;
1174         mem.bus.io_reserved_count = 0;
1175         /*
1176          * Determine where to move the buffer.
1177          */
1178         ret = ttm_bo_mem_space(bo, placement, &mem,
1179                                interruptible, no_wait_gpu);
1180         if (ret)
1181                 goto out_unlock;
1182         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1183                                      interruptible, no_wait_gpu);
1184 out_unlock:
1185         if (ret && mem.mm_node)
1186                 ttm_bo_mem_put(bo, &mem);
1187         return ret;
1188 }
1189
1190 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1191                               struct ttm_mem_reg *mem,
1192                               uint32_t *new_flags)
1193 {
1194         int i;
1195
1196         if (mem->mm_node && placement->lpfn != 0 &&
1197             (mem->start < placement->fpfn ||
1198              mem->start + mem->num_pages > placement->lpfn))
1199                 return false;
1200
1201         for (i = 0; i < placement->num_placement; i++) {
1202                 *new_flags = placement->placement[i];
1203                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1204                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1205                         return true;
1206         }
1207
1208         for (i = 0; i < placement->num_busy_placement; i++) {
1209                 *new_flags = placement->busy_placement[i];
1210                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1211                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1212                         return true;
1213         }
1214
1215         return false;
1216 }
1217
1218 int ttm_bo_validate(struct ttm_buffer_object *bo,
1219                         struct ttm_placement *placement,
1220                         bool interruptible,
1221                         bool no_wait_gpu)
1222 {
1223         int ret;
1224         uint32_t new_flags;
1225
1226         BUG_ON(!ttm_bo_is_reserved(bo));
1227         /* Check that range is valid */
1228         if (placement->lpfn || placement->fpfn)
1229                 if (placement->fpfn > placement->lpfn ||
1230                         (placement->lpfn - placement->fpfn) < bo->num_pages)
1231                         return -EINVAL;
1232         /*
1233          * Check whether we need to move buffer.
1234          */
1235         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1236                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1237                                          no_wait_gpu);
1238                 if (ret)
1239                         return ret;
1240         } else {
1241                 /*
1242                  * Use the access and other non-mapping-related flag bits from
1243                  * the compatible memory placement flags to the active flags
1244                  */
1245                 ttm_flag_masked(&bo->mem.placement, new_flags,
1246                                 ~TTM_PL_MASK_MEMTYPE);
1247         }
1248         /*
1249          * We might need to add a TTM.
1250          */
1251         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1252                 ret = ttm_bo_add_ttm(bo, true);
1253                 if (ret)
1254                         return ret;
1255         }
1256         return 0;
1257 }
1258 EXPORT_SYMBOL(ttm_bo_validate);
1259
1260 int ttm_bo_check_placement(struct ttm_buffer_object *bo,
1261                                 struct ttm_placement *placement)
1262 {
1263         BUG_ON((placement->fpfn || placement->lpfn) &&
1264                (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));
1265
1266         return 0;
1267 }
1268
1269 int ttm_bo_init(struct ttm_bo_device *bdev,
1270                 struct ttm_buffer_object *bo,
1271                 unsigned long size,
1272                 enum ttm_bo_type type,
1273                 struct ttm_placement *placement,
1274                 uint32_t page_alignment,
1275                 bool interruptible,
1276                 struct vm_object *persistent_swap_storage,
1277                 size_t acc_size,
1278                 struct sg_table *sg,
1279                 void (*destroy) (struct ttm_buffer_object *))
1280 {
1281         int ret = 0;
1282         unsigned long num_pages;
1283         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1284
1285         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1286         if (ret) {
1287                 kprintf("[TTM] Out of kernel memory\n");
1288                 if (destroy)
1289                         (*destroy)(bo);
1290                 else
1291                         kfree(bo);
1292                 return -ENOMEM;
1293         }
1294
1295         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1296         if (num_pages == 0) {
1297                 kprintf("[TTM] Illegal buffer object size\n");
1298                 if (destroy)
1299                         (*destroy)(bo);
1300                 else
1301                         kfree(bo);
1302                 ttm_mem_global_free(mem_glob, acc_size);
1303                 return -EINVAL;
1304         }
1305         bo->destroy = destroy;
1306
1307         kref_init(&bo->kref);
1308         kref_init(&bo->list_kref);
1309         atomic_set(&bo->cpu_writers, 0);
1310         atomic_set(&bo->reserved, 1);
1311         init_waitqueue_head(&bo->event_queue);
1312         INIT_LIST_HEAD(&bo->lru);
1313         INIT_LIST_HEAD(&bo->ddestroy);
1314         INIT_LIST_HEAD(&bo->swap);
1315         INIT_LIST_HEAD(&bo->io_reserve_lru);
1316         /*bzero(&bo->vm_rb, sizeof(bo->vm_rb));*/
1317         bo->bdev = bdev;
1318         bo->glob = bdev->glob;
1319         bo->type = type;
1320         bo->num_pages = num_pages;
1321         bo->mem.size = num_pages << PAGE_SHIFT;
1322         bo->mem.mem_type = TTM_PL_SYSTEM;
1323         bo->mem.num_pages = bo->num_pages;
1324         bo->mem.mm_node = NULL;
1325         bo->mem.page_alignment = page_alignment;
1326         bo->mem.bus.io_reserved_vm = false;
1327         bo->mem.bus.io_reserved_count = 0;
1328         bo->priv_flags = 0;
1329         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1330         bo->seq_valid = false;
1331         bo->persistent_swap_storage = persistent_swap_storage;
1332         bo->acc_size = acc_size;
1333         bo->sg = sg;
1334         atomic_inc(&bo->glob->bo_count);
1335
1336         /*
1337          * Mirror ref from kref_init() for list_kref.
1338          */
1339         set_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
1340
1341         ret = ttm_bo_check_placement(bo, placement);
1342         if (unlikely(ret != 0))
1343                 goto out_err;
1344
1345         /*
1346          * For ttm_bo_type_device buffers, allocate
1347          * address space from the device.
1348          */
1349         if (bo->type == ttm_bo_type_device ||
1350             bo->type == ttm_bo_type_sg) {
1351                 ret = ttm_bo_setup_vm(bo);
1352                 if (ret)
1353                         goto out_err;
1354         }
1355
1356         ret = ttm_bo_validate(bo, placement, interruptible, false);
1357         if (ret)
1358                 goto out_err;
1359
1360         ttm_bo_unreserve(bo);
1361         return 0;
1362
1363 out_err:
1364         ttm_bo_unreserve(bo);
1365         ttm_bo_unref(&bo);
1366
1367         return ret;
1368 }
1369 EXPORT_SYMBOL(ttm_bo_init);
1370
1371 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1372                        unsigned long bo_size,
1373                        unsigned struct_size)
1374 {
1375         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1376         size_t size = 0;
1377
1378         size += ttm_round_pot(struct_size);
1379         size += PAGE_ALIGN(npages * sizeof(void *));
1380         size += ttm_round_pot(sizeof(struct ttm_tt));
1381         return size;
1382 }
1383 EXPORT_SYMBOL(ttm_bo_acc_size);
1384
1385 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1386                            unsigned long bo_size,
1387                            unsigned struct_size)
1388 {
1389         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1390         size_t size = 0;
1391
1392         size += ttm_round_pot(struct_size);
1393         size += PAGE_ALIGN(npages * sizeof(void *));
1394         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1395         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1396         return size;
1397 }
1398 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1399
1400 int ttm_bo_create(struct ttm_bo_device *bdev,
1401                         unsigned long size,
1402                         enum ttm_bo_type type,
1403                         struct ttm_placement *placement,
1404                         uint32_t page_alignment,
1405                         bool interruptible,
1406                         struct vm_object *persistent_swap_storage,
1407                         struct ttm_buffer_object **p_bo)
1408 {
1409         struct ttm_buffer_object *bo;
1410         size_t acc_size;
1411         int ret;
1412
1413         *p_bo = NULL;
1414         bo = kmalloc(sizeof(*bo), M_DRM, M_WAITOK | M_ZERO);
1415         if (unlikely(bo == NULL))
1416                 return -ENOMEM;
1417
1418         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1419         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1420                           interruptible, persistent_swap_storage, acc_size,
1421                           NULL, NULL);
1422         if (likely(ret == 0))
1423                 *p_bo = bo;
1424
1425         return ret;
1426 }
1427 EXPORT_SYMBOL(ttm_bo_create);
1428
1429 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1430                                         unsigned mem_type, bool allow_errors)
1431 {
1432         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1433         struct ttm_bo_global *glob = bdev->glob;
1434         int ret;
1435
1436         /*
1437          * Can't use standard list traversal since we're unlocking.
1438          */
1439
1440         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1441         while (!list_empty(&man->lru)) {
1442                 lockmgr(&glob->lru_lock, LK_RELEASE);
1443                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1444                 if (ret) {
1445                         if (allow_errors) {
1446                                 return ret;
1447                         } else {
1448                                 kprintf("[TTM] Cleanup eviction failed\n");
1449                         }
1450                 }
1451                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1452         }
1453         lockmgr(&glob->lru_lock, LK_RELEASE);
1454         return 0;
1455 }
1456
1457 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1458 {
1459         struct ttm_mem_type_manager *man;
1460         int ret = -EINVAL;
1461
1462         if (mem_type >= TTM_NUM_MEM_TYPES) {
1463                 kprintf("[TTM] Illegal memory type %d\n", mem_type);
1464                 return ret;
1465         }
1466         man = &bdev->man[mem_type];
1467
1468         if (!man->has_type) {
1469                 kprintf("[TTM] Trying to take down uninitialized memory manager type %u\n",
1470                        mem_type);
1471                 return ret;
1472         }
1473
1474         man->use_type = false;
1475         man->has_type = false;
1476
1477         ret = 0;
1478         if (mem_type > 0) {
1479                 ttm_bo_force_list_clean(bdev, mem_type, false);
1480
1481                 ret = (*man->func->takedown)(man);
1482         }
1483
1484         return ret;
1485 }
1486 EXPORT_SYMBOL(ttm_bo_clean_mm);
1487
1488 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1489 {
1490         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1491
1492         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1493                 kprintf("[TTM] Illegal memory manager memory type %u\n", mem_type);
1494                 return -EINVAL;
1495         }
1496
1497         if (!man->has_type) {
1498                 kprintf("[TTM] Memory type %u has not been initialized\n", mem_type);
1499                 return 0;
1500         }
1501
1502         return ttm_bo_force_list_clean(bdev, mem_type, true);
1503 }
1504 EXPORT_SYMBOL(ttm_bo_evict_mm);
1505
1506 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1507                         unsigned long p_size)
1508 {
1509         int ret = -EINVAL;
1510         struct ttm_mem_type_manager *man;
1511
1512         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1513         man = &bdev->man[type];
1514         BUG_ON(man->has_type);
1515         man->io_reserve_fastpath = true;
1516         man->use_io_reserve_lru = false;
1517         lockinit(&man->io_reserve_mutex, "ttmman", 0, LK_CANRECURSE);
1518         INIT_LIST_HEAD(&man->io_reserve_lru);
1519
1520         ret = bdev->driver->init_mem_type(bdev, type, man);
1521         if (ret)
1522                 return ret;
1523         man->bdev = bdev;
1524
1525         ret = 0;
1526         if (type != TTM_PL_SYSTEM) {
1527                 ret = (*man->func->init)(man, p_size);
1528                 if (ret)
1529                         return ret;
1530         }
1531         man->has_type = true;
1532         man->use_type = true;
1533         man->size = p_size;
1534
1535         INIT_LIST_HEAD(&man->lru);
1536
1537         return 0;
1538 }
1539 EXPORT_SYMBOL(ttm_bo_init_mm);
1540
1541 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob)
1542 {
1543         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1544         vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1545         glob->dummy_read_page = NULL;
1546         /*
1547         vm_page_free(glob->dummy_read_page);
1548         */
1549 }
1550
1551 void ttm_bo_global_release(struct drm_global_reference *ref)
1552 {
1553         struct ttm_bo_global *glob = ref->object;
1554
1555         if (refcount_release(&glob->kobj_ref))
1556                 ttm_bo_global_kobj_release(glob);
1557 }
1558 EXPORT_SYMBOL(ttm_bo_global_release);
1559
1560 int ttm_bo_global_init(struct drm_global_reference *ref)
1561 {
1562         struct ttm_bo_global_ref *bo_ref =
1563                 container_of(ref, struct ttm_bo_global_ref, ref);
1564         struct ttm_bo_global *glob = ref->object;
1565         int ret;
1566
1567         lockinit(&glob->device_list_mutex, "ttmdlm", 0, LK_CANRECURSE);
1568         lockinit(&glob->lru_lock, "ttmlru", 0, LK_CANRECURSE);
1569         glob->mem_glob = bo_ref->mem_glob;
1570         glob->dummy_read_page = vm_page_alloc_contig(
1571             0, VM_MAX_ADDRESS, PAGE_SIZE, 0, 1*PAGE_SIZE, VM_MEMATTR_UNCACHEABLE);
1572
1573         if (unlikely(glob->dummy_read_page == NULL)) {
1574                 ret = -ENOMEM;
1575                 goto out_no_drp;
1576         }
1577
1578         INIT_LIST_HEAD(&glob->swap_lru);
1579         INIT_LIST_HEAD(&glob->device_list);
1580
1581         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1582         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1583         if (unlikely(ret != 0)) {
1584                 kprintf("[TTM] Could not register buffer object swapout\n");
1585                 goto out_no_shrink;
1586         }
1587
1588         atomic_set(&glob->bo_count, 0);
1589
1590         refcount_init(&glob->kobj_ref, 1);
1591         return (0);
1592
1593 out_no_shrink:
1594         vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1595         glob->dummy_read_page = NULL;
1596         /*
1597         vm_page_free(glob->dummy_read_page);
1598         */
1599 out_no_drp:
1600         kfree(glob);
1601         return ret;
1602 }
1603 EXPORT_SYMBOL(ttm_bo_global_init);
1604
1605
1606 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1607 {
1608         int ret = 0;
1609         unsigned i = TTM_NUM_MEM_TYPES;
1610         struct ttm_mem_type_manager *man;
1611         struct ttm_bo_global *glob = bdev->glob;
1612
1613         while (i--) {
1614                 man = &bdev->man[i];
1615                 if (man->has_type) {
1616                         man->use_type = false;
1617                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1618                                 ret = -EBUSY;
1619                                 kprintf("[TTM] DRM memory manager type %d is not clean\n",
1620                                        i);
1621                         }
1622                         man->has_type = false;
1623                 }
1624         }
1625
1626         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1627         list_del(&bdev->device_list);
1628         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1629
1630         cancel_delayed_work_sync(&bdev->wq);
1631
1632         while (ttm_bo_delayed_delete(bdev, true))
1633                 ;
1634
1635         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1636         if (list_empty(&bdev->ddestroy))
1637                 TTM_DEBUG("Delayed destroy list was clean\n");
1638
1639         if (list_empty(&bdev->man[0].lru))
1640                 TTM_DEBUG("Swap list was clean\n");
1641         lockmgr(&glob->lru_lock, LK_RELEASE);
1642
1643         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1644         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1645         drm_mm_takedown(&bdev->addr_space_mm);
1646         lockmgr(&bdev->vm_lock, LK_RELEASE);
1647
1648         return ret;
1649 }
1650 EXPORT_SYMBOL(ttm_bo_device_release);
1651
1652 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1653                        struct ttm_bo_global *glob,
1654                        struct ttm_bo_driver *driver,
1655                        uint64_t file_page_offset,
1656                        bool need_dma32)
1657 {
1658         int ret = -EINVAL;
1659
1660         lockinit(&bdev->vm_lock, "ttmvml", 0, LK_CANRECURSE);
1661         bdev->driver = driver;
1662
1663         memset(bdev->man, 0, sizeof(bdev->man));
1664
1665         /*
1666          * Initialize the system memory buffer type.
1667          * Other types need to be driver / IOCTL initialized.
1668          */
1669         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1670         if (unlikely(ret != 0))
1671                 goto out_no_sys;
1672
1673         RB_INIT(&bdev->addr_space_rb);
1674         drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1675
1676         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1677         INIT_LIST_HEAD(&bdev->ddestroy);
1678         bdev->dev_mapping = NULL;
1679         bdev->glob = glob;
1680         bdev->need_dma32 = need_dma32;
1681         bdev->val_seq = 0;
1682         lockinit(&bdev->fence_lock, "ttmfence", 0, LK_CANRECURSE);
1683         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1684         list_add_tail(&bdev->device_list, &glob->device_list);
1685         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1686
1687         return 0;
1688 out_no_sys:
1689         return ret;
1690 }
1691 EXPORT_SYMBOL(ttm_bo_device_init);
1692
1693 /*
1694  * buffer object vm functions.
1695  */
1696
1697 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1698 {
1699         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1700
1701         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1702                 if (mem->mem_type == TTM_PL_SYSTEM)
1703                         return false;
1704
1705                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1706                         return false;
1707
1708                 if (mem->placement & TTM_PL_FLAG_CACHED)
1709                         return false;
1710         }
1711         return true;
1712 }
1713
1714 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1715 {
1716
1717         ttm_bo_release_mmap(bo);
1718         ttm_mem_io_free_vm(bo);
1719 }
1720
1721 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1722 {
1723         struct ttm_bo_device *bdev = bo->bdev;
1724         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1725
1726         ttm_mem_io_lock(man, false);
1727         ttm_bo_unmap_virtual_locked(bo);
1728         ttm_mem_io_unlock(man);
1729 }
1730
1731
1732 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1733
1734 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1735 {
1736         struct ttm_bo_device *bdev = bo->bdev;
1737
1738         /* The caller acquired bdev->vm_lock. */
1739         RB_INSERT(ttm_bo_device_buffer_objects, &bdev->addr_space_rb, bo);
1740 }
1741
1742 /**
1743  * ttm_bo_setup_vm:
1744  *
1745  * @bo: the buffer to allocate address space for
1746  *
1747  * Allocate address space in the drm device so that applications
1748  * can mmap the buffer and access the contents. This only
1749  * applies to ttm_bo_type_device objects as others are not
1750  * placed in the drm device address space.
1751  */
1752
1753 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1754 {
1755         struct ttm_bo_device *bdev = bo->bdev;
1756         int ret;
1757
1758 retry_pre_get:
1759         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1760         if (unlikely(ret != 0))
1761                 return ret;
1762
1763         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1764         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1765                                          bo->mem.num_pages, 0, 0);
1766
1767         if (unlikely(bo->vm_node == NULL)) {
1768                 ret = -ENOMEM;
1769                 goto out_unlock;
1770         }
1771
1772         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1773                                               bo->mem.num_pages, 0);
1774
1775         if (unlikely(bo->vm_node == NULL)) {
1776                 lockmgr(&bdev->vm_lock, LK_RELEASE);
1777                 goto retry_pre_get;
1778         }
1779
1780         ttm_bo_vm_insert_rb(bo);
1781         lockmgr(&bdev->vm_lock, LK_RELEASE);
1782         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1783
1784         return 0;
1785 out_unlock:
1786         lockmgr(&bdev->vm_lock, LK_RELEASE);
1787         return ret;
1788 }
1789
1790 int ttm_bo_wait(struct ttm_buffer_object *bo,
1791                 bool lazy, bool interruptible, bool no_wait)
1792 {
1793         struct ttm_bo_driver *driver = bo->bdev->driver;
1794         struct ttm_bo_device *bdev = bo->bdev;
1795         void *sync_obj;
1796         int ret = 0;
1797
1798         if (likely(bo->sync_obj == NULL))
1799                 return 0;
1800
1801         while (bo->sync_obj) {
1802
1803                 if (driver->sync_obj_signaled(bo->sync_obj)) {
1804                         void *tmp_obj = bo->sync_obj;
1805                         bo->sync_obj = NULL;
1806                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1807                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1808                         driver->sync_obj_unref(&tmp_obj);
1809                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1810                         continue;
1811                 }
1812
1813                 if (no_wait)
1814                         return -EBUSY;
1815
1816                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1817                 lockmgr(&bdev->fence_lock, LK_RELEASE);
1818                 ret = driver->sync_obj_wait(sync_obj,
1819                                             lazy, interruptible);
1820                 if (unlikely(ret != 0)) {
1821                         driver->sync_obj_unref(&sync_obj);
1822                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1823                         return ret;
1824                 }
1825                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1826                 if (likely(bo->sync_obj == sync_obj)) {
1827                         void *tmp_obj = bo->sync_obj;
1828                         bo->sync_obj = NULL;
1829                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1830                                   &bo->priv_flags);
1831                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1832                         driver->sync_obj_unref(&sync_obj);
1833                         driver->sync_obj_unref(&tmp_obj);
1834                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1835                 } else {
1836                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1837                         driver->sync_obj_unref(&sync_obj);
1838                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1839                 }
1840         }
1841         return 0;
1842 }
1843 EXPORT_SYMBOL(ttm_bo_wait);
1844
1845 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1846 {
1847         struct ttm_bo_device *bdev = bo->bdev;
1848         int ret = 0;
1849
1850         /*
1851          * Using ttm_bo_reserve makes sure the lru lists are updated.
1852          */
1853
1854         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1855         if (unlikely(ret != 0))
1856                 return ret;
1857         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1858         ret = ttm_bo_wait(bo, false, true, no_wait);
1859         lockmgr(&bdev->fence_lock, LK_RELEASE);
1860         if (likely(ret == 0))
1861                 atomic_inc(&bo->cpu_writers);
1862         ttm_bo_unreserve(bo);
1863         return ret;
1864 }
1865 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1866
1867 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1868 {
1869         atomic_dec(&bo->cpu_writers);
1870 }
1871 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1872
1873 /**
1874  * A buffer object shrink method that tries to swap out the first
1875  * buffer object on the bo_global::swap_lru list.
1876  */
1877
1878 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1879 {
1880         struct ttm_bo_global *glob =
1881             container_of(shrink, struct ttm_bo_global, shrink);
1882         struct ttm_buffer_object *bo;
1883         int ret = -EBUSY;
1884         int put_count;
1885         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1886
1887         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1888         list_for_each_entry(bo, &glob->swap_lru, swap) {
1889                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1890                 if (!ret)
1891                         break;
1892         }
1893
1894         if (ret) {
1895                 lockmgr(&glob->lru_lock, LK_RELEASE);
1896                 return ret;
1897         }
1898
1899         kref_get(&bo->list_kref);
1900
1901         if (!list_empty(&bo->ddestroy)) {
1902                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1903                 kref_put(&bo->list_kref, ttm_bo_release_list);
1904                 return ret;
1905         }
1906
1907         put_count = ttm_bo_del_from_lru(bo);
1908         lockmgr(&glob->lru_lock, LK_RELEASE);
1909
1910         ttm_bo_list_ref_sub(bo, put_count, true);
1911
1912         /**
1913          * Wait for GPU, then move to system cached.
1914          */
1915
1916         lockmgr(&bo->bdev->fence_lock, LK_EXCLUSIVE);
1917         ret = ttm_bo_wait(bo, false, false, false);
1918         lockmgr(&bo->bdev->fence_lock, LK_RELEASE);
1919
1920         if (unlikely(ret != 0))
1921                 goto out;
1922
1923         if ((bo->mem.placement & swap_placement) != swap_placement) {
1924                 struct ttm_mem_reg evict_mem;
1925
1926                 evict_mem = bo->mem;
1927                 evict_mem.mm_node = NULL;
1928                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1929                 evict_mem.mem_type = TTM_PL_SYSTEM;
1930
1931                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1932                                              false, false);
1933                 if (unlikely(ret != 0))
1934                         goto out;
1935         }
1936
1937         ttm_bo_unmap_virtual(bo);
1938
1939         /**
1940          * Swap out. Buffer will be swapped in again as soon as
1941          * anyone tries to access a ttm page.
1942          */
1943
1944         if (bo->bdev->driver->swap_notify)
1945                 bo->bdev->driver->swap_notify(bo);
1946
1947         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1948 out:
1949
1950         /**
1951          *
1952          * Unreserve without putting on LRU to avoid swapping out an
1953          * already swapped buffer.
1954          */
1955
1956         ttm_bo_unreserve_core(bo);
1957         kref_put(&bo->list_kref, ttm_bo_release_list);
1958         return ret;
1959 }
1960
1961 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1962 {
1963         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1964                 ;
1965 }
1966 EXPORT_SYMBOL(ttm_bo_swapout_all);