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_place(const struct ttm_place *place,
  50                                           uint32_t *mem_type)
  51 {
  52         int i;
  53
  54         for (i = 0; i <= TTM_PL_PRIV5; i++)
  55                 if (place->flags & (1 << i)) {
  56                         *mem_type = i;
  57                         return 0;
  58                 }
  59         return -EINVAL;
  60 }
  61
  62 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  63 {
  64         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  65
  66         pr_err("    has_type: %d\n", man->has_type);
  67         pr_err("    use_type: %d\n", man->use_type);
  68         pr_err("    flags: 0x%08X\n", man->flags);
  69         pr_err("    gpu_offset: 0x%08lX\n", man->gpu_offset);
  70         pr_err("    size: %ju\n", (uintmax_t)man->size);
  71         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  72         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  73         if (mem_type != TTM_PL_SYSTEM)
  74                 (*man->func->debug)(man, TTM_PFX);
  75 }
  76
  77 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  78                                         struct ttm_placement *placement)
  79 {
  80         int i, ret, mem_type;
  81
  82         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  83                bo, bo->mem.num_pages, bo->mem.size >> 10,
  84                bo->mem.size >> 20);
  85         for (i = 0; i < placement->num_placement; i++) {
  86                 ret = ttm_mem_type_from_place(&placement->placement[i],
  87                                                 &mem_type);
  88                 if (ret)
  89                         return;
  90                 pr_err("  placement[%d]=0x%08X (%d)\n",
  91                        i, placement->placement[i].flags, mem_type);
  92                 ttm_mem_type_debug(bo->bdev, mem_type);
  93         }
  94 }
  95
  96 #if 0
  97 static ssize_t ttm_bo_global_show(struct ttm_bo_global *glob,
  98     char *buffer)
  99 {
 100
 101         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 102                         (unsigned long) atomic_read(&glob->bo_count));
 103 }
 104 #endif
 105
 106 static inline uint32_t ttm_bo_type_flags(unsigned type)
 107 {
 108         return 1 << (type);
 109 }
 110
 111 static void ttm_bo_release_list(struct kref *list_kref)
 112 {
 113         struct ttm_buffer_object *bo =
 114             container_of(list_kref, struct ttm_buffer_object, list_kref);
 115         struct ttm_bo_device *bdev = bo->bdev;
 116         size_t acc_size = bo->acc_size;
 117
 118         BUG_ON(atomic_read(&bo->list_kref.refcount));
 119         BUG_ON(atomic_read(&bo->kref.refcount));
 120         BUG_ON(atomic_read(&bo->cpu_writers));
 121         BUG_ON(bo->sync_obj != NULL);
 122         BUG_ON(bo->mem.mm_node != NULL);
 123         BUG_ON(!list_empty(&bo->lru));
 124         BUG_ON(!list_empty(&bo->ddestroy));
 125
 126         if (bo->ttm)
 127                 ttm_tt_destroy(bo->ttm);
 128         atomic_dec(&bo->glob->bo_count);
 129         if (bo->destroy)
 130                 bo->destroy(bo);
 131         else {
 132                 kfree(bo);
 133         }
 134         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 135 }
 136
 137 static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
 138                                   bool interruptible)
 139 {
 140         if (interruptible) {
 141                 return wait_event_interruptible(bo->event_queue,
 142                                                !ttm_bo_is_reserved(bo));
 143         } else {
 144                 wait_event(bo->event_queue, !ttm_bo_is_reserved(bo));
 145                 return 0;
 146         }
 147 }
 148
 149 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 150 {
 151         struct ttm_bo_device *bdev = bo->bdev;
 152         struct ttm_mem_type_manager *man;
 153
 154         BUG_ON(!ttm_bo_is_reserved(bo));
 155
 156         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 157
 158                 BUG_ON(!list_empty(&bo->lru));
 159
 160                 man = &bdev->man[bo->mem.mem_type];
 161                 list_add_tail(&bo->lru, &man->lru);
 162                 kref_get(&bo->list_kref);
 163
 164                 if (bo->ttm != NULL) {
 165                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 166                         kref_get(&bo->list_kref);
 167                 }
 168         }
 169 }
 170
 171 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 172 {
 173         int put_count = 0;
 174
 175         if (!list_empty(&bo->swap)) {
 176                 list_del_init(&bo->swap);
 177                 ++put_count;
 178         }
 179         if (!list_empty(&bo->lru)) {
 180                 list_del_init(&bo->lru);
 181                 ++put_count;
 182         }
 183
 184         /*
 185          * TODO: Add a driver hook to delete from
 186          * driver-specific LRU's here.
 187          */
 188
 189         return put_count;
 190 }
 191
 192 int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
 193                           bool interruptible,
 194                           bool no_wait, bool use_ticket,
 195                           struct ww_acquire_ctx *ticket)
 196 {
 197         int ret;
 198
 199         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 200                 /**
 201                  * Deadlock avoidance for multi-bo reserving.
 202                  */
 203                 if (use_ticket && bo->seq_valid) {
 204                         /**
 205                          * We've already reserved this one.
 206                          */
 207                         if (unlikely(ticket->stamp == bo->val_seq))
 208                                 return -EDEADLK;
 209                         /**
 210                          * Already reserved by a thread that will not back
 211                          * off for us. We need to back off.
 212                          */
 213                         if (unlikely(ticket->stamp - bo->val_seq <= LONG_MAX))
 214                                 return -EAGAIN;
 215                 }
 216
 217                 if (no_wait)
 218                         return -EBUSY;
 219
 220                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 221
 222                 if (unlikely(ret))
 223                         return ret;
 224         }
 225
 226         if (use_ticket) {
 227                 bool wake_up = false;
 228
 229                 /**
 230                  * Wake up waiters that may need to recheck for deadlock,
 231                  * if we decreased the sequence number.
 232                  */
 233                 if (unlikely((bo->val_seq - ticket->stamp <= LONG_MAX)
 234                              || !bo->seq_valid))
 235                         wake_up = true;
 236
 237                 /*
 238                  * In the worst case with memory ordering these values can be
 239                  * seen in the wrong order. However since we call wake_up_all
 240                  * in that case, this will hopefully not pose a problem,
 241                  * and the worst case would only cause someone to accidentally
 242                  * hit -EAGAIN in ttm_bo_reserve when they see old value of
 243                  * val_seq. However this would only happen if seq_valid was
 244                  * written before val_seq was, and just means some slightly
 245                  * increased cpu usage
 246                  */
 247                 bo->val_seq = ticket->stamp;
 248                 bo->seq_valid = true;
 249                 if (wake_up)
 250                         wake_up_all(&bo->event_queue);
 251         } else {
 252                 bo->seq_valid = false;
 253         }
 254
 255         return 0;
 256 }
 257 EXPORT_SYMBOL(ttm_bo_reserve);
 258
 259 static void ttm_bo_ref_bug(struct kref *list_kref)
 260 {
 261         BUG();
 262 }
 263
 264 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 265                          bool never_free)
 266 {
 267         kref_sub(&bo->list_kref, count,
 268                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 269 }
 270
 271 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 272                    bool interruptible,
 273                    bool no_wait, bool use_ticket,
 274                    struct ww_acquire_ctx *ticket)
 275 {
 276         struct ttm_bo_global *glob = bo->glob;
 277         int put_count = 0;
 278         int ret;
 279
 280         ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_ticket,
 281                                     ticket);
 282         if (likely(ret == 0)) {
 283                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 284                 put_count = ttm_bo_del_from_lru(bo);
 285                 lockmgr(&glob->lru_lock, LK_RELEASE);
 286                 ttm_bo_list_ref_sub(bo, put_count, true);
 287         }
 288
 289         return ret;
 290 }
 291
 292 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
 293                                   bool interruptible,
 294                                   struct ww_acquire_ctx *ticket)
 295 {
 296         bool wake_up = false;
 297         int ret;
 298
 299         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 300                 WARN_ON(bo->seq_valid && ticket->stamp == bo->val_seq);
 301
 302                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 303
 304                 if (unlikely(ret))
 305                         return ret;
 306         }
 307
 308         if (bo->val_seq - ticket->stamp < LONG_MAX || !bo->seq_valid)
 309                 wake_up = true;
 310
 311         /**
 312          * Wake up waiters that may need to recheck for deadlock,
 313          * if we decreased the sequence number.
 314          */
 315         bo->val_seq = ticket->stamp;
 316         bo->seq_valid = true;
 317         if (wake_up)
 318                 wake_up_all(&bo->event_queue);
 319
 320         return 0;
 321 }
 322
 323 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 324                             bool interruptible, struct ww_acquire_ctx *ticket)
 325 {
 326         struct ttm_bo_global *glob = bo->glob;
 327         int put_count, ret;
 328
 329         ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, ticket);
 330         if (likely(!ret)) {
 331                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 332                 put_count = ttm_bo_del_from_lru(bo);
 333                 lockmgr(&glob->lru_lock, LK_RELEASE);
 334                 ttm_bo_list_ref_sub(bo, put_count, true);
 335         }
 336         return ret;
 337 }
 338 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
 339
 340 /*
 341  * Must interlock with event_queue to avoid race against
 342  * wait_event_common() which can cause wait_event_common()
 343  * to become stuck.
 344  */
 345 static void
 346 ttm_bo_unreserve_core(struct ttm_buffer_object *bo)
 347 {
 348         lockmgr(&bo->event_queue.lock, LK_EXCLUSIVE);
 349         atomic_set(&bo->reserved, 0);
 350         lockmgr(&bo->event_queue.lock, LK_RELEASE);
 351         wake_up_all(&bo->event_queue);
 352 }
 353
 354 void ttm_bo_unreserve_ticket_locked(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
 355 {
 356         ttm_bo_add_to_lru(bo);
 357         ttm_bo_unreserve_core(bo);
 358 }
 359
 360 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 361 {
 362         struct ttm_bo_global *glob = bo->glob;
 363
 364         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 365         ttm_bo_unreserve_ticket_locked(bo, NULL);
 366         lockmgr(&glob->lru_lock, LK_RELEASE);
 367 }
 368 EXPORT_SYMBOL(ttm_bo_unreserve);
 369
 370 void ttm_bo_unreserve_ticket(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
 371 {
 372         struct ttm_bo_global *glob = bo->glob;
 373
 374         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 375         ttm_bo_unreserve_ticket_locked(bo, ticket);
 376         lockmgr(&glob->lru_lock, LK_RELEASE);
 377 }
 378 EXPORT_SYMBOL(ttm_bo_unreserve_ticket);
 379
 380 /*
 381  * Call bo->mutex locked.
 382  */
 383 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 384 {
 385         struct ttm_bo_device *bdev = bo->bdev;
 386         struct ttm_bo_global *glob = bo->glob;
 387         int ret = 0;
 388         uint32_t page_flags = 0;
 389
 390         TTM_ASSERT_LOCKED(&bo->mutex);
 391         bo->ttm = NULL;
 392
 393         if (bdev->need_dma32)
 394                 page_flags |= TTM_PAGE_FLAG_DMA32;
 395
 396         switch (bo->type) {
 397         case ttm_bo_type_device:
 398                 if (zero_alloc)
 399                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 400         case ttm_bo_type_kernel:
 401                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 402                                                       page_flags, glob->dummy_read_page);
 403                 if (unlikely(bo->ttm == NULL))
 404                         ret = -ENOMEM;
 405                 break;
 406         case ttm_bo_type_sg:
 407                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 408                                                       page_flags | TTM_PAGE_FLAG_SG,
 409                                                       glob->dummy_read_page);
 410                 if (unlikely(bo->ttm == NULL)) {
 411                         ret = -ENOMEM;
 412                         break;
 413                 }
 414                 bo->ttm->sg = bo->sg;
 415                 break;
 416         default:
 417                 pr_err("Illegal buffer object type\n");
 418                 ret = -EINVAL;
 419                 break;
 420         }
 421
 422         return ret;
 423 }
 424
 425 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 426                                   struct ttm_mem_reg *mem,
 427                                   bool evict, bool interruptible,
 428                                   bool no_wait_gpu)
 429 {
 430         struct ttm_bo_device *bdev = bo->bdev;
 431         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 432         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 433         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 434         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 435         int ret = 0;
 436
 437         if (old_is_pci || new_is_pci ||
 438             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 439                 ret = ttm_mem_io_lock(old_man, true);
 440                 if (unlikely(ret != 0))
 441                         goto out_err;
 442                 ttm_bo_unmap_virtual_locked(bo);
 443                 ttm_mem_io_unlock(old_man);
 444         }
 445
 446         /*
 447          * Create and bind a ttm if required.
 448          */
 449
 450         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 451                 if (bo->ttm == NULL) {
 452                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 453                         ret = ttm_bo_add_ttm(bo, zero);
 454                         if (ret)
 455                                 goto out_err;
 456                 }
 457
 458                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 459                 if (ret)
 460                         goto out_err;
 461
 462                 if (mem->mem_type != TTM_PL_SYSTEM) {
 463                         ret = ttm_tt_bind(bo->ttm, mem);
 464                         if (ret)
 465                                 goto out_err;
 466                 }
 467
 468                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 469                         if (bdev->driver->move_notify)
 470                                 bdev->driver->move_notify(bo, mem);
 471                         bo->mem = *mem;
 472                         mem->mm_node = NULL;
 473                         goto moved;
 474                 }
 475         }
 476
 477         if (bdev->driver->move_notify)
 478                 bdev->driver->move_notify(bo, mem);
 479
 480         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 481             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 482                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 483         else if (bdev->driver->move)
 484                 ret = bdev->driver->move(bo, evict, interruptible,
 485                                          no_wait_gpu, mem);
 486         else
 487                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 488
 489         if (ret) {
 490                 if (bdev->driver->move_notify) {
 491                         struct ttm_mem_reg tmp_mem = *mem;
 492                         *mem = bo->mem;
 493                         bo->mem = tmp_mem;
 494                         bdev->driver->move_notify(bo, mem);
 495                         bo->mem = *mem;
 496                         *mem = tmp_mem;
 497                 }
 498
 499                 goto out_err;
 500         }
 501
 502 moved:
 503         if (bo->evicted) {
 504                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 505                 if (ret)
 506                         pr_err("Can not flush read caches\n");
 507                 bo->evicted = false;
 508         }
 509
 510         if (bo->mem.mm_node) {
 511                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 512                     bdev->man[bo->mem.mem_type].gpu_offset;
 513                 bo->cur_placement = bo->mem.placement;
 514         } else
 515                 bo->offset = 0;
 516
 517         return 0;
 518
 519 out_err:
 520         new_man = &bdev->man[bo->mem.mem_type];
 521         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 522                 ttm_tt_unbind(bo->ttm);
 523                 ttm_tt_destroy(bo->ttm);
 524                 bo->ttm = NULL;
 525         }
 526
 527         return ret;
 528 }
 529
 530 /**
 531  * Call bo::reserved.
 532  * Will release GPU memory type usage on destruction.
 533  * This is the place to put in driver specific hooks to release
 534  * driver private resources.
 535  * Will release the bo::reserved lock.
 536  */
 537
 538 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 539 {
 540         if (bo->bdev->driver->move_notify)
 541                 bo->bdev->driver->move_notify(bo, NULL);
 542
 543         if (bo->ttm) {
 544                 ttm_tt_unbind(bo->ttm);
 545                 ttm_tt_destroy(bo->ttm);
 546                 bo->ttm = NULL;
 547         }
 548         ttm_bo_mem_put(bo, &bo->mem);
 549         ttm_bo_unreserve_core(bo);
 550
 551         /*
 552          * Since the final reference to this bo may not be dropped by
 553          * the current task we have to put a memory barrier here to make
 554          * sure the changes done in this function are always visible.
 555          *
 556          * This function only needs protection against the final kref_put.
 557          */
 558         cpu_mfence();
 559 }
 560
 561 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 562 {
 563         struct ttm_bo_device *bdev = bo->bdev;
 564         struct ttm_bo_global *glob = bo->glob;
 565         struct ttm_bo_driver *driver = bdev->driver;
 566         void *sync_obj = NULL;
 567         int put_count;
 568         int ret;
 569
 570         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 571         ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 572
 573         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 574         (void) ttm_bo_wait(bo, false, false, true);
 575         if (!ret && !bo->sync_obj) {
 576                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 577                 put_count = ttm_bo_del_from_lru(bo);
 578
 579                 lockmgr(&glob->lru_lock, LK_RELEASE);
 580                 ttm_bo_cleanup_memtype_use(bo);
 581
 582                 ttm_bo_list_ref_sub(bo, put_count, true);
 583
 584                 return;
 585         }
 586         if (bo->sync_obj)
 587                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 588         lockmgr(&bdev->fence_lock, LK_RELEASE);
 589
 590         if (!ret) {
 591
 592                 /*
 593                  * Make NO_EVICT bos immediately available to
 594                  * shrinkers, now that they are queued for
 595                  * destruction.
 596                  */
 597                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 598                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 599                         ttm_bo_add_to_lru(bo);
 600                 }
 601
 602                 ttm_bo_unreserve_core(bo);
 603         }
 604
 605         kref_get(&bo->list_kref);
 606         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 607         lockmgr(&glob->lru_lock, LK_RELEASE);
 608
 609         if (sync_obj) {
 610                 driver->sync_obj_flush(sync_obj);
 611                 driver->sync_obj_unref(&sync_obj);
 612         }
 613         schedule_delayed_work(&bdev->wq,
 614                               ((hz / 100) < 1) ? 1 : hz / 100);
 615 }
 616
 617 /**
 618  * function ttm_bo_cleanup_refs_and_unlock
 619  * If bo idle, remove from delayed- and lru lists, and unref.
 620  * If not idle, do nothing.
 621  *
 622  * Must be called with lru_lock and reservation held, this function
 623  * will drop both before returning.
 624  *
 625  * @interruptible         Any sleeps should occur interruptibly.
 626  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 627  */
 628
 629 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 630                                           bool interruptible,
 631                                           bool no_wait_gpu)
 632 {
 633         struct ttm_bo_device *bdev = bo->bdev;
 634         struct ttm_bo_driver *driver = bdev->driver;
 635         struct ttm_bo_global *glob = bo->glob;
 636         int put_count;
 637         int ret;
 638
 639         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 640         ret = ttm_bo_wait(bo, false, false, true);
 641
 642         if (ret && !no_wait_gpu) {
 643                 void *sync_obj;
 644
 645                 /*
 646                  * Take a reference to the fence and unreserve,
 647                  * at this point the buffer should be dead, so
 648                  * no new sync objects can be attached.
 649                  */
 650                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 651                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 652
 653                 ttm_bo_unreserve_core(bo);
 654                 lockmgr(&glob->lru_lock, LK_RELEASE);
 655
 656                 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
 657                 driver->sync_obj_unref(&sync_obj);
 658                 if (ret)
 659                         return ret;
 660
 661                 /*
 662                  * remove sync_obj with ttm_bo_wait, the wait should be
 663                  * finished, and no new wait object should have been added.
 664                  */
 665                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 666                 ret = ttm_bo_wait(bo, false, false, true);
 667                 WARN_ON(ret);
 668                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 669                 if (ret)
 670                         return ret;
 671
 672                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 673                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 674
 675                 /*
 676                  * We raced, and lost, someone else holds the reservation now,
 677                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 678                  *
 679                  * Even if it's not the case, because we finished waiting any
 680                  * delayed destruction would succeed, so just return success
 681                  * here.
 682                  */
 683                 if (ret) {
 684                         lockmgr(&glob->lru_lock, LK_RELEASE);
 685                         return 0;
 686                 }
 687         } else
 688                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 689
 690         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 691                 ttm_bo_unreserve_core(bo);
 692                 lockmgr(&glob->lru_lock, LK_RELEASE);
 693                 return ret;
 694         }
 695
 696         put_count = ttm_bo_del_from_lru(bo);
 697         list_del_init(&bo->ddestroy);
 698         ++put_count;
 699
 700         lockmgr(&glob->lru_lock, LK_RELEASE);
 701         ttm_bo_cleanup_memtype_use(bo);
 702
 703         ttm_bo_list_ref_sub(bo, put_count, true);
 704
 705         return 0;
 706 }
 707
 708 /**
 709  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 710  * encountered buffers.
 711  */
 712
 713 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 714 {
 715         struct ttm_bo_global *glob = bdev->glob;
 716         struct ttm_buffer_object *entry = NULL;
 717         int ret = 0;
 718
 719         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 720         if (list_empty(&bdev->ddestroy))
 721                 goto out_unlock;
 722
 723         entry = list_first_entry(&bdev->ddestroy,
 724                 struct ttm_buffer_object, ddestroy);
 725         kref_get(&entry->list_kref);
 726
 727         for (;;) {
 728                 struct ttm_buffer_object *nentry = NULL;
 729
 730                 if (entry->ddestroy.next != &bdev->ddestroy) {
 731                         nentry = list_first_entry(&entry->ddestroy,
 732                                 struct ttm_buffer_object, ddestroy);
 733                         kref_get(&nentry->list_kref);
 734                 }
 735
 736                 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
 737                 if (remove_all && ret) {
 738                         lockmgr(&glob->lru_lock, LK_RELEASE);
 739                         ret = ttm_bo_reserve_nolru(entry, false, false,
 740                                                    false, 0);
 741                         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 742                 }
 743
 744                 if (!ret)
 745                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 746                                                              !remove_all);
 747                 else
 748                         lockmgr(&glob->lru_lock, LK_RELEASE);
 749
 750                 kref_put(&entry->list_kref, ttm_bo_release_list);
 751                 entry = nentry;
 752
 753                 if (ret || !entry)
 754                         goto out;
 755
 756                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 757                 if (list_empty(&entry->ddestroy))
 758                         break;
 759         }
 760
 761 out_unlock:
 762         lockmgr(&glob->lru_lock, LK_RELEASE);
 763 out:
 764         if (entry)
 765                 kref_put(&entry->list_kref, ttm_bo_release_list);
 766         return ret;
 767 }
 768
 769 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 770 {
 771         struct ttm_bo_device *bdev =
 772             container_of(work, struct ttm_bo_device, wq.work);
 773
 774         if (ttm_bo_delayed_delete(bdev, false)) {
 775                 schedule_delayed_work(&bdev->wq,
 776                                       ((hz / 100) < 1) ? 1 : hz / 100);
 777         }
 778 }
 779
 780 /*
 781  * NOTE: bdev->vm_lock already held on call, this function release it.
 782  */
 783 static void ttm_bo_release(struct kref *kref)
 784 {
 785         struct ttm_buffer_object *bo =
 786             container_of(kref, struct ttm_buffer_object, kref);
 787         struct ttm_bo_device *bdev = bo->bdev;
 788         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 789         int release_active;
 790
 791         if (atomic_read(&bo->kref.refcount) > 0) {
 792                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 793                 return;
 794         }
 795         if (likely(bo->vm_node != NULL)) {
 796                 RB_REMOVE(ttm_bo_device_buffer_objects,
 797                                 &bdev->addr_space_rb, bo);
 798                 drm_mm_put_block(bo->vm_node);
 799                 bo->vm_node = NULL;
 800         }
 801
 802         /*
 803          * Should we clean up our implied list_kref?  Because ttm_bo_release()
 804          * can be called reentrantly due to races (this may not be true any
 805          * more with the lock management changes in the deref), it is possible
 806          * to get here twice, but there's only one list_kref ref to drop and
 807          * in the other path 'bo' can be kfree()d by another thread the
 808          * instant we release our lock.
 809          */
 810         release_active = test_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 811         if (release_active) {
 812                 clear_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 813                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 814                 ttm_mem_io_lock(man, false);
 815                 ttm_mem_io_free_vm(bo);
 816                 ttm_mem_io_unlock(man);
 817                 ttm_bo_cleanup_refs_or_queue(bo);
 818                 kref_put(&bo->list_kref, ttm_bo_release_list);
 819         } else {
 820                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 821         }
 822 }
 823
 824 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 825 {
 826         struct ttm_buffer_object *bo = *p_bo;
 827         struct ttm_bo_device *bdev = bo->bdev;
 828
 829         *p_bo = NULL;
 830         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
 831         if (kref_put(&bo->kref, ttm_bo_release) == 0)
 832                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 833 }
 834 EXPORT_SYMBOL(ttm_bo_unref);
 835
 836 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 837 {
 838         return cancel_delayed_work_sync(&bdev->wq);
 839 }
 840 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 841
 842 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 843 {
 844         if (resched)
 845                 schedule_delayed_work(&bdev->wq,
 846                                       ((hz / 100) < 1) ? 1 : hz / 100);
 847 }
 848 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 849
 850 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 851                         bool no_wait_gpu)
 852 {
 853         struct ttm_bo_device *bdev = bo->bdev;
 854         struct ttm_mem_reg evict_mem;
 855         struct ttm_placement placement;
 856         int ret = 0;
 857
 858         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 859         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 860         lockmgr(&bdev->fence_lock, LK_RELEASE);
 861
 862         if (unlikely(ret != 0)) {
 863                 if (ret != -ERESTARTSYS) {
 864                         pr_err("Failed to expire sync object before buffer eviction\n");
 865                 }
 866                 goto out;
 867         }
 868
 869         BUG_ON(!ttm_bo_is_reserved(bo));
 870
 871         evict_mem = bo->mem;
 872         evict_mem.mm_node = NULL;
 873         evict_mem.bus.io_reserved_vm = false;
 874         evict_mem.bus.io_reserved_count = 0;
 875
 876         placement.num_placement = 0;
 877         placement.num_busy_placement = 0;
 878         bdev->driver->evict_flags(bo, &placement);
 879         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 880                                 no_wait_gpu);
 881         if (ret) {
 882                 if (ret != -ERESTARTSYS) {
 883                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 884                                bo);
 885                         ttm_bo_mem_space_debug(bo, &placement);
 886                 }
 887                 goto out;
 888         }
 889
 890         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 891                                      no_wait_gpu);
 892         if (ret) {
 893                 if (ret != -ERESTARTSYS)
 894                         pr_err("Buffer eviction failed\n");
 895                 ttm_bo_mem_put(bo, &evict_mem);
 896                 goto out;
 897         }
 898         bo->evicted = true;
 899 out:
 900         return ret;
 901 }
 902
 903 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 904                                 uint32_t mem_type,
 905                                 bool interruptible,
 906                                 bool no_wait_gpu)
 907 {
 908         struct ttm_bo_global *glob = bdev->glob;
 909         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 910         struct ttm_buffer_object *bo;
 911         int ret = -EBUSY, put_count;
 912
 913         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 914         list_for_each_entry(bo, &man->lru, lru) {
 915                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 916                 if (!ret)
 917                         break;
 918         }
 919
 920         if (ret) {
 921                 lockmgr(&glob->lru_lock, LK_RELEASE);
 922                 return ret;
 923         }
 924
 925         kref_get(&bo->list_kref);
 926
 927         if (!list_empty(&bo->ddestroy)) {
 928                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 929                                                      no_wait_gpu);
 930                 kref_put(&bo->list_kref, ttm_bo_release_list);
 931                 return ret;
 932         }
 933
 934         put_count = ttm_bo_del_from_lru(bo);
 935         lockmgr(&glob->lru_lock, LK_RELEASE);
 936
 937         BUG_ON(ret != 0);
 938
 939         ttm_bo_list_ref_sub(bo, put_count, true);
 940
 941         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 942         ttm_bo_unreserve(bo);
 943
 944         kref_put(&bo->list_kref, ttm_bo_release_list);
 945         return ret;
 946 }
 947
 948 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 949 {
 950         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 951
 952         if (mem->mm_node)
 953                 (*man->func->put_node)(man, mem);
 954 }
 955 EXPORT_SYMBOL(ttm_bo_mem_put);
 956
 957 /**
 958  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 959  * space, or we've evicted everything and there isn't enough space.
 960  */
 961 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 962                                         uint32_t mem_type,
 963                                         const struct ttm_place *place,
 964                                         struct ttm_mem_reg *mem,
 965                                         bool interruptible,
 966                                         bool no_wait_gpu)
 967 {
 968         struct ttm_bo_device *bdev = bo->bdev;
 969         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 970         int ret;
 971
 972         do {
 973                 ret = (*man->func->get_node)(man, bo, place, mem);
 974                 if (unlikely(ret != 0))
 975                         return ret;
 976                 if (mem->mm_node)
 977                         break;
 978                 ret = ttm_mem_evict_first(bdev, mem_type,
 979                                           interruptible, no_wait_gpu);
 980                 if (unlikely(ret != 0))
 981                         return ret;
 982         } while (1);
 983         if (mem->mm_node == NULL)
 984                 return -ENOMEM;
 985         mem->mem_type = mem_type;
 986         return 0;
 987 }
 988
 989 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 990                                       uint32_t cur_placement,
 991                                       uint32_t proposed_placement)
 992 {
 993         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 994         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 995
 996         /**
 997          * Keep current caching if possible.
 998          */
 999
1000         if ((cur_placement & caching) != 0)
1001                 result |= (cur_placement & caching);
1002         else if ((man->default_caching & caching) != 0)
1003                 result |= man->default_caching;
1004         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
1005                 result |= TTM_PL_FLAG_CACHED;
1006         else if ((TTM_PL_FLAG_WC & caching) != 0)
1007                 result |= TTM_PL_FLAG_WC;
1008         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
1009                 result |= TTM_PL_FLAG_UNCACHED;
1010
1011         return result;
1012 }
1013
1014 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1015                                  uint32_t mem_type,
1016                                  const struct ttm_place *place,
1017                                  uint32_t *masked_placement)
1018 {
1019         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1020
1021         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
1022                 return false;
1023
1024         if ((place->flags & man->available_caching) == 0)
1025                 return false;
1026
1027         cur_flags |= (place->flags & man->available_caching);
1028
1029         *masked_placement = cur_flags;
1030         return true;
1031 }
1032
1033 /**
1034  * Creates space for memory region @mem according to its type.
1035  *
1036  * This function first searches for free space in compatible memory types in
1037  * the priority order defined by the driver.  If free space isn't found, then
1038  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1039  * space.
1040  */
1041 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1042                         struct ttm_placement *placement,
1043                         struct ttm_mem_reg *mem,
1044                         bool interruptible,
1045                         bool no_wait_gpu)
1046 {
1047         struct ttm_bo_device *bdev = bo->bdev;
1048         struct ttm_mem_type_manager *man;
1049         uint32_t mem_type = TTM_PL_SYSTEM;
1050         uint32_t cur_flags = 0;
1051         bool type_found = false;
1052         bool type_ok = false;
1053         bool has_erestartsys = false;
1054         int i, ret;
1055
1056         mem->mm_node = NULL;
1057         for (i = 0; i < placement->num_placement; ++i) {
1058                 const struct ttm_place *place = &placement->placement[i];
1059
1060                 ret = ttm_mem_type_from_place(place, &mem_type);
1061                 if (ret)
1062                         return ret;
1063                 man = &bdev->man[mem_type];
1064
1065                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
1066                                                 &cur_flags);
1067
1068                 if (!type_ok)
1069                         continue;
1070
1071                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1072                                                   cur_flags);
1073                 /*
1074                  * Use the access and other non-mapping-related flag bits from
1075                  * the memory placement flags to the current flags
1076                  */
1077                 ttm_flag_masked(&cur_flags, place->flags,
1078                                 ~TTM_PL_MASK_MEMTYPE);
1079
1080                 if (mem_type == TTM_PL_SYSTEM)
1081                         break;
1082
1083                 if (man->has_type && man->use_type) {
1084                         type_found = true;
1085                         ret = (*man->func->get_node)(man, bo, place, mem);
1086                         if (unlikely(ret))
1087                                 return ret;
1088                 }
1089                 if (mem->mm_node)
1090                         break;
1091         }
1092
1093         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1094                 mem->mem_type = mem_type;
1095                 mem->placement = cur_flags;
1096                 return 0;
1097         }
1098
1099         if (!type_found)
1100                 return -EINVAL;
1101
1102         for (i = 0; i < placement->num_busy_placement; ++i) {
1103                 const struct ttm_place *place = &placement->busy_placement[i];
1104
1105                 ret = ttm_mem_type_from_place(place, &mem_type);
1106                 if (ret)
1107                         return ret;
1108                 man = &bdev->man[mem_type];
1109                 if (!man->has_type)
1110                         continue;
1111                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1112                         continue;
1113
1114                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1115                                                   cur_flags);
1116                 /*
1117                  * Use the access and other non-mapping-related flag bits from
1118                  * the memory placement flags to the current flags
1119                  */
1120                 ttm_flag_masked(&cur_flags, place->flags,
1121                                 ~TTM_PL_MASK_MEMTYPE);
1122
1123                 if (mem_type == TTM_PL_SYSTEM) {
1124                         mem->mem_type = mem_type;
1125                         mem->placement = cur_flags;
1126                         mem->mm_node = NULL;
1127                         return 0;
1128                 }
1129
1130                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
1131                                                 interruptible, no_wait_gpu);
1132                 if (ret == 0 && mem->mm_node) {
1133                         mem->placement = cur_flags;
1134                         return 0;
1135                 }
1136                 if (ret == -ERESTARTSYS)
1137                         has_erestartsys = true;
1138         }
1139         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1140         return ret;
1141 }
1142 EXPORT_SYMBOL(ttm_bo_mem_space);
1143
1144 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1145                         struct ttm_placement *placement,
1146                         bool interruptible,
1147                         bool no_wait_gpu)
1148 {
1149         int ret = 0;
1150         struct ttm_mem_reg mem;
1151         struct ttm_bo_device *bdev = bo->bdev;
1152
1153         BUG_ON(!ttm_bo_is_reserved(bo));
1154
1155         /*
1156          * FIXME: It's possible to pipeline buffer moves.
1157          * Have the driver move function wait for idle when necessary,
1158          * instead of doing it here.
1159          */
1160         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1161         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1162         lockmgr(&bdev->fence_lock, LK_RELEASE);
1163         if (ret)
1164                 return ret;
1165         mem.num_pages = bo->num_pages;
1166         mem.size = mem.num_pages << PAGE_SHIFT;
1167         mem.page_alignment = bo->mem.page_alignment;
1168         mem.bus.io_reserved_vm = false;
1169         mem.bus.io_reserved_count = 0;
1170         /*
1171          * Determine where to move the buffer.
1172          */
1173         ret = ttm_bo_mem_space(bo, placement, &mem,
1174                                interruptible, no_wait_gpu);
1175         if (ret)
1176                 goto out_unlock;
1177         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1178                                      interruptible, no_wait_gpu);
1179 out_unlock:
1180         if (ret && mem.mm_node)
1181                 ttm_bo_mem_put(bo, &mem);
1182         return ret;
1183 }
1184
1185 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1186                               struct ttm_mem_reg *mem,
1187                               uint32_t *new_flags)
1188 {
1189         int i;
1190
1191         for (i = 0; i < placement->num_placement; i++) {
1192                 const struct ttm_place *heap = &placement->placement[i];
1193                 if (mem->mm_node &&
1194                     (mem->start < heap->fpfn ||
1195                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1196                         continue;
1197
1198                 *new_flags = heap->flags;
1199                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1200                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1201                         return true;
1202         }
1203
1204         for (i = 0; i < placement->num_busy_placement; i++) {
1205                 const struct ttm_place *heap = &placement->busy_placement[i];
1206                 if (mem->mm_node &&
1207                     (mem->start < heap->fpfn ||
1208                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1209                         continue;
1210
1211                 *new_flags = heap->flags;
1212                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1213                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1214                         return true;
1215         }
1216
1217         return false;
1218 }
1219
1220 int ttm_bo_validate(struct ttm_buffer_object *bo,
1221                         struct ttm_placement *placement,
1222                         bool interruptible,
1223                         bool no_wait_gpu)
1224 {
1225         int ret;
1226         uint32_t new_flags;
1227
1228         BUG_ON(!ttm_bo_is_reserved(bo));
1229         /*
1230          * Check whether we need to move buffer.
1231          */
1232         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1233                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1234                                          no_wait_gpu);
1235                 if (ret)
1236                         return ret;
1237         } else {
1238                 /*
1239                  * Use the access and other non-mapping-related flag bits from
1240                  * the compatible memory placement flags to the active flags
1241                  */
1242                 ttm_flag_masked(&bo->mem.placement, new_flags,
1243                                 ~TTM_PL_MASK_MEMTYPE);
1244         }
1245         /*
1246          * We might need to add a TTM.
1247          */
1248         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1249                 ret = ttm_bo_add_ttm(bo, true);
1250                 if (ret)
1251                         return ret;
1252         }
1253         return 0;
1254 }
1255 EXPORT_SYMBOL(ttm_bo_validate);
1256
1257 int ttm_bo_init(struct ttm_bo_device *bdev,
1258                 struct ttm_buffer_object *bo,
1259                 unsigned long size,
1260                 enum ttm_bo_type type,
1261                 struct ttm_placement *placement,
1262                 uint32_t page_alignment,
1263                 bool interruptible,
1264                 struct vm_object *persistent_swap_storage,
1265                 size_t acc_size,
1266                 struct sg_table *sg,
1267                 void (*destroy) (struct ttm_buffer_object *))
1268 {
1269         int ret = 0;
1270         unsigned long num_pages;
1271         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1272
1273         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1274         if (ret) {
1275                 pr_err("Out of kernel memory\n");
1276                 if (destroy)
1277                         (*destroy)(bo);
1278                 else
1279                         kfree(bo);
1280                 return -ENOMEM;
1281         }
1282
1283         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1284         if (num_pages == 0) {
1285                 pr_err("Illegal buffer object size\n");
1286                 if (destroy)
1287                         (*destroy)(bo);
1288                 else
1289                         kfree(bo);
1290                 ttm_mem_global_free(mem_glob, acc_size);
1291                 return -EINVAL;
1292         }
1293         bo->destroy = destroy;
1294
1295         kref_init(&bo->kref);
1296         kref_init(&bo->list_kref);
1297         atomic_set(&bo->cpu_writers, 0);
1298         atomic_set(&bo->reserved, 1);
1299         init_waitqueue_head(&bo->event_queue);
1300         INIT_LIST_HEAD(&bo->lru);
1301         INIT_LIST_HEAD(&bo->ddestroy);
1302         INIT_LIST_HEAD(&bo->swap);
1303         INIT_LIST_HEAD(&bo->io_reserve_lru);
1304         /*bzero(&bo->vm_rb, sizeof(bo->vm_rb));*/
1305         bo->bdev = bdev;
1306         bo->glob = bdev->glob;
1307         bo->type = type;
1308         bo->num_pages = num_pages;
1309         bo->mem.size = num_pages << PAGE_SHIFT;
1310         bo->mem.mem_type = TTM_PL_SYSTEM;
1311         bo->mem.num_pages = bo->num_pages;
1312         bo->mem.mm_node = NULL;
1313         bo->mem.page_alignment = page_alignment;
1314         bo->mem.bus.io_reserved_vm = false;
1315         bo->mem.bus.io_reserved_count = 0;
1316         bo->priv_flags = 0;
1317         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1318         bo->seq_valid = false;
1319         bo->persistent_swap_storage = persistent_swap_storage;
1320         bo->acc_size = acc_size;
1321         bo->sg = sg;
1322         atomic_inc(&bo->glob->bo_count);
1323
1324         /*
1325          * Mirror ref from kref_init() for list_kref.
1326          */
1327         set_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
1328
1329         /*
1330          * For ttm_bo_type_device buffers, allocate
1331          * address space from the device.
1332          */
1333         if (bo->type == ttm_bo_type_device ||
1334             bo->type == ttm_bo_type_sg) {
1335                 ret = ttm_bo_setup_vm(bo);
1336                 if (ret)
1337                         goto out_err;
1338         }
1339
1340         ret = ttm_bo_validate(bo, placement, interruptible, false);
1341         if (ret)
1342                 goto out_err;
1343
1344         ttm_bo_unreserve(bo);
1345         return 0;
1346
1347 out_err:
1348         ttm_bo_unreserve(bo);
1349         ttm_bo_unref(&bo);
1350
1351         return ret;
1352 }
1353 EXPORT_SYMBOL(ttm_bo_init);
1354
1355 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1356                        unsigned long bo_size,
1357                        unsigned struct_size)
1358 {
1359         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1360         size_t size = 0;
1361
1362         size += ttm_round_pot(struct_size);
1363         size += PAGE_ALIGN(npages * sizeof(void *));
1364         size += ttm_round_pot(sizeof(struct ttm_tt));
1365         return size;
1366 }
1367 EXPORT_SYMBOL(ttm_bo_acc_size);
1368
1369 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1370                            unsigned long bo_size,
1371                            unsigned struct_size)
1372 {
1373         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1374         size_t size = 0;
1375
1376         size += ttm_round_pot(struct_size);
1377         size += PAGE_ALIGN(npages * sizeof(void *));
1378         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1379         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1380         return size;
1381 }
1382 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1383
1384 int ttm_bo_create(struct ttm_bo_device *bdev,
1385                         unsigned long size,
1386                         enum ttm_bo_type type,
1387                         struct ttm_placement *placement,
1388                         uint32_t page_alignment,
1389                         bool interruptible,
1390                         struct vm_object *persistent_swap_storage,
1391                         struct ttm_buffer_object **p_bo)
1392 {
1393         struct ttm_buffer_object *bo;
1394         size_t acc_size;
1395         int ret;
1396
1397         *p_bo = NULL;
1398         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1399         if (unlikely(bo == NULL))
1400                 return -ENOMEM;
1401
1402         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1403         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1404                           interruptible, persistent_swap_storage, acc_size,
1405                           NULL, NULL);
1406         if (likely(ret == 0))
1407                 *p_bo = bo;
1408
1409         return ret;
1410 }
1411 EXPORT_SYMBOL(ttm_bo_create);
1412
1413 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1414                                         unsigned mem_type, bool allow_errors)
1415 {
1416         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1417         struct ttm_bo_global *glob = bdev->glob;
1418         int ret;
1419
1420         /*
1421          * Can't use standard list traversal since we're unlocking.
1422          */
1423
1424         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1425         while (!list_empty(&man->lru)) {
1426                 lockmgr(&glob->lru_lock, LK_RELEASE);
1427                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1428                 if (ret) {
1429                         if (allow_errors) {
1430                                 return ret;
1431                         } else {
1432                                 pr_err("Cleanup eviction failed\n");
1433                         }
1434                 }
1435                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1436         }
1437         lockmgr(&glob->lru_lock, LK_RELEASE);
1438         return 0;
1439 }
1440
1441 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1442 {
1443         struct ttm_mem_type_manager *man;
1444         int ret = -EINVAL;
1445
1446         if (mem_type >= TTM_NUM_MEM_TYPES) {
1447                 pr_err("Illegal memory type %d\n", mem_type);
1448                 return ret;
1449         }
1450         man = &bdev->man[mem_type];
1451
1452         if (!man->has_type) {
1453                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1454                        mem_type);
1455                 return ret;
1456         }
1457
1458         man->use_type = false;
1459         man->has_type = false;
1460
1461         ret = 0;
1462         if (mem_type > 0) {
1463                 ttm_bo_force_list_clean(bdev, mem_type, false);
1464
1465                 ret = (*man->func->takedown)(man);
1466         }
1467
1468         return ret;
1469 }
1470 EXPORT_SYMBOL(ttm_bo_clean_mm);
1471
1472 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1473 {
1474         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1475
1476         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1477                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1478                 return -EINVAL;
1479         }
1480
1481         if (!man->has_type) {
1482                 pr_err("Memory type %u has not been initialized\n", mem_type);
1483                 return 0;
1484         }
1485
1486         return ttm_bo_force_list_clean(bdev, mem_type, true);
1487 }
1488 EXPORT_SYMBOL(ttm_bo_evict_mm);
1489
1490 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1491                         unsigned long p_size)
1492 {
1493         int ret = -EINVAL;
1494         struct ttm_mem_type_manager *man;
1495
1496         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1497         man = &bdev->man[type];
1498         BUG_ON(man->has_type);
1499         man->io_reserve_fastpath = true;
1500         man->use_io_reserve_lru = false;
1501         lockinit(&man->io_reserve_mutex, "ttmman", 0, LK_CANRECURSE);
1502         INIT_LIST_HEAD(&man->io_reserve_lru);
1503
1504         ret = bdev->driver->init_mem_type(bdev, type, man);
1505         if (ret)
1506                 return ret;
1507         man->bdev = bdev;
1508
1509         ret = 0;
1510         if (type != TTM_PL_SYSTEM) {
1511                 ret = (*man->func->init)(man, p_size);
1512                 if (ret)
1513                         return ret;
1514         }
1515         man->has_type = true;
1516         man->use_type = true;
1517         man->size = p_size;
1518
1519         INIT_LIST_HEAD(&man->lru);
1520
1521         return 0;
1522 }
1523 EXPORT_SYMBOL(ttm_bo_init_mm);
1524
1525 static void ttm_bo_global_kobj_release(struct ttm_bo_global *glob)
1526 {
1527         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1528         vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1529         glob->dummy_read_page = NULL;
1530         /*
1531         vm_page_free(glob->dummy_read_page);
1532         */
1533 }
1534
1535 void ttm_bo_global_release(struct drm_global_reference *ref)
1536 {
1537         struct ttm_bo_global *glob = ref->object;
1538
1539         if (refcount_release(&glob->kobj_ref))
1540                 ttm_bo_global_kobj_release(glob);
1541 }
1542 EXPORT_SYMBOL(ttm_bo_global_release);
1543
1544 int ttm_bo_global_init(struct drm_global_reference *ref)
1545 {
1546         struct ttm_bo_global_ref *bo_ref =
1547                 container_of(ref, struct ttm_bo_global_ref, ref);
1548         struct ttm_bo_global *glob = ref->object;
1549         int ret;
1550
1551         lockinit(&glob->device_list_mutex, "ttmdlm", 0, LK_CANRECURSE);
1552         lockinit(&glob->lru_lock, "ttmlru", 0, LK_CANRECURSE);
1553         glob->mem_glob = bo_ref->mem_glob;
1554         glob->dummy_read_page = vm_page_alloc_contig(
1555             0, VM_MAX_ADDRESS, PAGE_SIZE, 0, 1*PAGE_SIZE, VM_MEMATTR_UNCACHEABLE);
1556
1557         if (unlikely(glob->dummy_read_page == NULL)) {
1558                 ret = -ENOMEM;
1559                 goto out_no_drp;
1560         }
1561
1562         INIT_LIST_HEAD(&glob->swap_lru);
1563         INIT_LIST_HEAD(&glob->device_list);
1564
1565         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1566         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1567         if (unlikely(ret != 0)) {
1568                 pr_err("Could not register buffer object swapout\n");
1569                 goto out_no_shrink;
1570         }
1571
1572         atomic_set(&glob->bo_count, 0);
1573
1574         refcount_init(&glob->kobj_ref, 1);
1575         return (0);
1576
1577 out_no_shrink:
1578         vm_page_free_contig(glob->dummy_read_page, PAGE_SIZE);
1579         glob->dummy_read_page = NULL;
1580         /*
1581         vm_page_free(glob->dummy_read_page);
1582         */
1583 out_no_drp:
1584         kfree(glob);
1585         return ret;
1586 }
1587 EXPORT_SYMBOL(ttm_bo_global_init);
1588
1589
1590 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1591 {
1592         int ret = 0;
1593         unsigned i = TTM_NUM_MEM_TYPES;
1594         struct ttm_mem_type_manager *man;
1595         struct ttm_bo_global *glob = bdev->glob;
1596
1597         while (i--) {
1598                 man = &bdev->man[i];
1599                 if (man->has_type) {
1600                         man->use_type = false;
1601                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1602                                 ret = -EBUSY;
1603                                 pr_err("DRM memory manager type %d is not clean\n",
1604                                        i);
1605                         }
1606                         man->has_type = false;
1607                 }
1608         }
1609
1610         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1611         list_del(&bdev->device_list);
1612         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1613
1614         cancel_delayed_work_sync(&bdev->wq);
1615
1616         while (ttm_bo_delayed_delete(bdev, true))
1617                 ;
1618
1619         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1620         if (list_empty(&bdev->ddestroy))
1621                 TTM_DEBUG("Delayed destroy list was clean\n");
1622
1623         if (list_empty(&bdev->man[0].lru))
1624                 TTM_DEBUG("Swap list was clean\n");
1625         lockmgr(&glob->lru_lock, LK_RELEASE);
1626
1627         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1628         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1629         drm_mm_takedown(&bdev->addr_space_mm);
1630         lockmgr(&bdev->vm_lock, LK_RELEASE);
1631
1632         return ret;
1633 }
1634 EXPORT_SYMBOL(ttm_bo_device_release);
1635
1636 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1637                        struct ttm_bo_global *glob,
1638                        struct ttm_bo_driver *driver,
1639                        uint64_t file_page_offset,
1640                        bool need_dma32)
1641 {
1642         int ret = -EINVAL;
1643
1644         lockinit(&bdev->vm_lock, "ttmvml", 0, LK_CANRECURSE);
1645         bdev->driver = driver;
1646
1647         memset(bdev->man, 0, sizeof(bdev->man));
1648
1649         /*
1650          * Initialize the system memory buffer type.
1651          * Other types need to be driver / IOCTL initialized.
1652          */
1653         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1654         if (unlikely(ret != 0))
1655                 goto out_no_sys;
1656
1657         RB_INIT(&bdev->addr_space_rb);
1658         drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1659
1660         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1661         INIT_LIST_HEAD(&bdev->ddestroy);
1662         bdev->dev_mapping = NULL;
1663         bdev->glob = glob;
1664         bdev->need_dma32 = need_dma32;
1665         bdev->val_seq = 0;
1666         lockinit(&bdev->fence_lock, "ttmfence", 0, LK_CANRECURSE);
1667         lockmgr(&glob->device_list_mutex, LK_EXCLUSIVE);
1668         list_add_tail(&bdev->device_list, &glob->device_list);
1669         lockmgr(&glob->device_list_mutex, LK_RELEASE);
1670
1671         return 0;
1672 out_no_sys:
1673         return ret;
1674 }
1675 EXPORT_SYMBOL(ttm_bo_device_init);
1676
1677 /*
1678  * buffer object vm functions.
1679  */
1680
1681 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1682 {
1683         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1684
1685         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1686                 if (mem->mem_type == TTM_PL_SYSTEM)
1687                         return false;
1688
1689                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1690                         return false;
1691
1692                 if (mem->placement & TTM_PL_FLAG_CACHED)
1693                         return false;
1694         }
1695         return true;
1696 }
1697
1698 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1699 {
1700
1701         ttm_bo_release_mmap(bo);
1702         ttm_mem_io_free_vm(bo);
1703 }
1704
1705 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1706 {
1707         struct ttm_bo_device *bdev = bo->bdev;
1708         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1709
1710         ttm_mem_io_lock(man, false);
1711         ttm_bo_unmap_virtual_locked(bo);
1712         ttm_mem_io_unlock(man);
1713 }
1714
1715
1716 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1717
1718 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1719 {
1720         struct ttm_bo_device *bdev = bo->bdev;
1721
1722         /* The caller acquired bdev->vm_lock. */
1723         RB_INSERT(ttm_bo_device_buffer_objects, &bdev->addr_space_rb, bo);
1724 }
1725
1726 /**
1727  * ttm_bo_setup_vm:
1728  *
1729  * @bo: the buffer to allocate address space for
1730  *
1731  * Allocate address space in the drm device so that applications
1732  * can mmap the buffer and access the contents. This only
1733  * applies to ttm_bo_type_device objects as others are not
1734  * placed in the drm device address space.
1735  */
1736
1737 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1738 {
1739         struct ttm_bo_device *bdev = bo->bdev;
1740         int ret;
1741
1742 retry_pre_get:
1743         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1744         if (unlikely(ret != 0))
1745                 return ret;
1746
1747         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1748         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1749                                          bo->mem.num_pages, 0, 0);
1750
1751         if (unlikely(bo->vm_node == NULL)) {
1752                 ret = -ENOMEM;
1753                 goto out_unlock;
1754         }
1755
1756         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1757                                               bo->mem.num_pages, 0);
1758
1759         if (unlikely(bo->vm_node == NULL)) {
1760                 lockmgr(&bdev->vm_lock, LK_RELEASE);
1761                 goto retry_pre_get;
1762         }
1763
1764         ttm_bo_vm_insert_rb(bo);
1765         lockmgr(&bdev->vm_lock, LK_RELEASE);
1766         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1767
1768         return 0;
1769 out_unlock:
1770         lockmgr(&bdev->vm_lock, LK_RELEASE);
1771         return ret;
1772 }
1773
1774 int ttm_bo_wait(struct ttm_buffer_object *bo,
1775                 bool lazy, bool interruptible, bool no_wait)
1776 {
1777         struct ttm_bo_driver *driver = bo->bdev->driver;
1778         struct ttm_bo_device *bdev = bo->bdev;
1779         void *sync_obj;
1780         int ret = 0;
1781
1782         if (likely(bo->sync_obj == NULL))
1783                 return 0;
1784
1785         while (bo->sync_obj) {
1786
1787                 if (driver->sync_obj_signaled(bo->sync_obj)) {
1788                         void *tmp_obj = bo->sync_obj;
1789                         bo->sync_obj = NULL;
1790                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1791                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1792                         driver->sync_obj_unref(&tmp_obj);
1793                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1794                         continue;
1795                 }
1796
1797                 if (no_wait)
1798                         return -EBUSY;
1799
1800                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1801                 lockmgr(&bdev->fence_lock, LK_RELEASE);
1802                 ret = driver->sync_obj_wait(sync_obj,
1803                                             lazy, interruptible);
1804                 if (unlikely(ret != 0)) {
1805                         driver->sync_obj_unref(&sync_obj);
1806                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1807                         return ret;
1808                 }
1809                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1810                 if (likely(bo->sync_obj == sync_obj)) {
1811                         void *tmp_obj = bo->sync_obj;
1812                         bo->sync_obj = NULL;
1813                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1814                                   &bo->priv_flags);
1815                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1816                         driver->sync_obj_unref(&sync_obj);
1817                         driver->sync_obj_unref(&tmp_obj);
1818                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1819                 } else {
1820                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1821                         driver->sync_obj_unref(&sync_obj);
1822                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1823                 }
1824         }
1825         return 0;
1826 }
1827 EXPORT_SYMBOL(ttm_bo_wait);
1828
1829 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1830 {
1831         struct ttm_bo_device *bdev = bo->bdev;
1832         int ret = 0;
1833
1834         /*
1835          * Using ttm_bo_reserve makes sure the lru lists are updated.
1836          */
1837
1838         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1839         if (unlikely(ret != 0))
1840                 return ret;
1841         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1842         ret = ttm_bo_wait(bo, false, true, no_wait);
1843         lockmgr(&bdev->fence_lock, LK_RELEASE);
1844         if (likely(ret == 0))
1845                 atomic_inc(&bo->cpu_writers);
1846         ttm_bo_unreserve(bo);
1847         return ret;
1848 }
1849 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1850
1851 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1852 {
1853         atomic_dec(&bo->cpu_writers);
1854 }
1855 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1856
1857 /**
1858  * A buffer object shrink method that tries to swap out the first
1859  * buffer object on the bo_global::swap_lru list.
1860  */
1861
1862 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1863 {
1864         struct ttm_bo_global *glob =
1865             container_of(shrink, struct ttm_bo_global, shrink);
1866         struct ttm_buffer_object *bo;
1867         int ret = -EBUSY;
1868         int put_count;
1869         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1870
1871         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1872         list_for_each_entry(bo, &glob->swap_lru, swap) {
1873                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1874                 if (!ret)
1875                         break;
1876         }
1877
1878         if (ret) {
1879                 lockmgr(&glob->lru_lock, LK_RELEASE);
1880                 return ret;
1881         }
1882
1883         kref_get(&bo->list_kref);
1884
1885         if (!list_empty(&bo->ddestroy)) {
1886                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1887                 kref_put(&bo->list_kref, ttm_bo_release_list);
1888                 return ret;
1889         }
1890
1891         put_count = ttm_bo_del_from_lru(bo);
1892         lockmgr(&glob->lru_lock, LK_RELEASE);
1893
1894         ttm_bo_list_ref_sub(bo, put_count, true);
1895
1896         /**
1897          * Wait for GPU, then move to system cached.
1898          */
1899
1900         lockmgr(&bo->bdev->fence_lock, LK_EXCLUSIVE);
1901         ret = ttm_bo_wait(bo, false, false, false);
1902         lockmgr(&bo->bdev->fence_lock, LK_RELEASE);
1903
1904         if (unlikely(ret != 0))
1905                 goto out;
1906
1907         if ((bo->mem.placement & swap_placement) != swap_placement) {
1908                 struct ttm_mem_reg evict_mem;
1909
1910                 evict_mem = bo->mem;
1911                 evict_mem.mm_node = NULL;
1912                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1913                 evict_mem.mem_type = TTM_PL_SYSTEM;
1914
1915                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1916                                              false, false);
1917                 if (unlikely(ret != 0))
1918                         goto out;
1919         }
1920
1921         ttm_bo_unmap_virtual(bo);
1922
1923         /**
1924          * Swap out. Buffer will be swapped in again as soon as
1925          * anyone tries to access a ttm page.
1926          */
1927
1928         if (bo->bdev->driver->swap_notify)
1929                 bo->bdev->driver->swap_notify(bo);
1930
1931         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1932 out:
1933
1934         /**
1935          *
1936          * Unreserve without putting on LRU to avoid swapping out an
1937          * already swapped buffer.
1938          */
1939
1940         ttm_bo_unreserve_core(bo);
1941         kref_put(&bo->list_kref, ttm_bo_release_list);
1942         return ret;
1943 }
1944
1945 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1946 {
1947         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1948                 ;
1949 }
1950 EXPORT_SYMBOL(ttm_bo_swapout_all);