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/jiffies.h>
  37 #include <linux/slab.h>
  38 #include <linux/sched.h>
  39 #include <linux/mm.h>
  40 #include <linux/file.h>
  41 #include <linux/module.h>
  42 #include <linux/atomic.h>
  43
  44 #define TTM_ASSERT_LOCKED(param)        do { } while (0)
  45 #define TTM_DEBUG(fmt, arg...)          do { } while (0)
  46 #define TTM_BO_HASH_ORDER 13
  47
  48 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
  49 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  50 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  51
  52 static struct attribute ttm_bo_count = {
  53         .name = "bo_count",
  54         .mode = S_IRUGO
  55 };
  56
  57 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
  58                                           uint32_t *mem_type)
  59 {
  60         int i;
  61
  62         for (i = 0; i <= TTM_PL_PRIV5; i++)
  63                 if (place->flags & (1 << i)) {
  64                         *mem_type = i;
  65                         return 0;
  66                 }
  67         return -EINVAL;
  68 }
  69
  70 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  71 {
  72         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  73
  74         pr_err("    has_type: %d\n", man->has_type);
  75         pr_err("    use_type: %d\n", man->use_type);
  76         pr_err("    flags: 0x%08X\n", man->flags);
  77         pr_err("    gpu_offset: 0x%08lX\n", man->gpu_offset);
  78         pr_err("    size: %ju\n", (uintmax_t)man->size);
  79         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  80         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  81         if (mem_type != TTM_PL_SYSTEM)
  82                 (*man->func->debug)(man, TTM_PFX);
  83 }
  84
  85 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  86                                         struct ttm_placement *placement)
  87 {
  88         int i, ret, mem_type;
  89
  90         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  91                bo, bo->mem.num_pages, bo->mem.size >> 10,
  92                bo->mem.size >> 20);
  93         for (i = 0; i < placement->num_placement; i++) {
  94                 ret = ttm_mem_type_from_place(&placement->placement[i],
  95                                                 &mem_type);
  96                 if (ret)
  97                         return;
  98                 pr_err("  placement[%d]=0x%08X (%d)\n",
  99                        i, placement->placement[i].flags, mem_type);
 100                 ttm_mem_type_debug(bo->bdev, mem_type);
 101         }
 102 }
 103
 104 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 105                                   struct attribute *attr,
 106                                   char *buffer)
 107 {
 108         struct ttm_bo_global *glob =
 109                 container_of(kobj, struct ttm_bo_global, kobj);
 110
 111         return ksnprintf(buffer, PAGE_SIZE, "%lu\n",
 112                         (unsigned long) atomic_read(&glob->bo_count));
 113 }
 114
 115 static struct attribute *ttm_bo_global_attrs[] = {
 116         &ttm_bo_count,
 117         NULL
 118 };
 119
 120 static const struct sysfs_ops ttm_bo_global_ops = {
 121         .show = &ttm_bo_global_show
 122 };
 123
 124 static struct kobj_type ttm_bo_glob_kobj_type  = {
 125         .release = &ttm_bo_global_kobj_release,
 126         .sysfs_ops = &ttm_bo_global_ops,
 127         .default_attrs = ttm_bo_global_attrs
 128 };
 129
 130 static inline uint32_t ttm_bo_type_flags(unsigned type)
 131 {
 132         return 1 << (type);
 133 }
 134
 135 static void ttm_bo_release_list(struct kref *list_kref)
 136 {
 137         struct ttm_buffer_object *bo =
 138             container_of(list_kref, struct ttm_buffer_object, list_kref);
 139         struct ttm_bo_device *bdev = bo->bdev;
 140         size_t acc_size = bo->acc_size;
 141
 142         BUG_ON(atomic_read(&bo->list_kref.refcount));
 143         BUG_ON(atomic_read(&bo->kref.refcount));
 144         BUG_ON(atomic_read(&bo->cpu_writers));
 145         BUG_ON(bo->sync_obj != NULL);
 146         BUG_ON(bo->mem.mm_node != NULL);
 147         BUG_ON(!list_empty(&bo->lru));
 148         BUG_ON(!list_empty(&bo->ddestroy));
 149
 150         if (bo->ttm)
 151                 ttm_tt_destroy(bo->ttm);
 152         atomic_dec(&bo->glob->bo_count);
 153         if (bo->destroy)
 154                 bo->destroy(bo);
 155         else {
 156                 kfree(bo);
 157         }
 158         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 159 }
 160
 161 static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo,
 162                                   bool interruptible)
 163 {
 164         if (interruptible) {
 165                 return wait_event_interruptible(bo->event_queue,
 166                                                !ttm_bo_is_reserved(bo));
 167         } else {
 168                 wait_event(bo->event_queue, !ttm_bo_is_reserved(bo));
 169                 return 0;
 170         }
 171 }
 172
 173 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 174 {
 175         struct ttm_bo_device *bdev = bo->bdev;
 176         struct ttm_mem_type_manager *man;
 177
 178         BUG_ON(!ttm_bo_is_reserved(bo));
 179
 180         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 181
 182                 BUG_ON(!list_empty(&bo->lru));
 183
 184                 man = &bdev->man[bo->mem.mem_type];
 185                 list_add_tail(&bo->lru, &man->lru);
 186                 kref_get(&bo->list_kref);
 187
 188                 if (bo->ttm != NULL) {
 189                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 190                         kref_get(&bo->list_kref);
 191                 }
 192         }
 193 }
 194
 195 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 196 {
 197         int put_count = 0;
 198
 199         if (!list_empty(&bo->swap)) {
 200                 list_del_init(&bo->swap);
 201                 ++put_count;
 202         }
 203         if (!list_empty(&bo->lru)) {
 204                 list_del_init(&bo->lru);
 205                 ++put_count;
 206         }
 207
 208         /*
 209          * TODO: Add a driver hook to delete from
 210          * driver-specific LRU's here.
 211          */
 212
 213         return put_count;
 214 }
 215
 216 int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
 217                           bool interruptible,
 218                           bool no_wait, bool use_ticket,
 219                           struct ww_acquire_ctx *ticket)
 220 {
 221         int ret;
 222
 223         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 224                 /**
 225                  * Deadlock avoidance for multi-bo reserving.
 226                  */
 227                 if (use_ticket && bo->seq_valid) {
 228                         /**
 229                          * We've already reserved this one.
 230                          */
 231                         if (unlikely(ticket->stamp == bo->val_seq))
 232                                 return -EDEADLK;
 233                         /**
 234                          * Already reserved by a thread that will not back
 235                          * off for us. We need to back off.
 236                          */
 237                         if (unlikely(ticket->stamp - bo->val_seq <= LONG_MAX))
 238                                 return -EAGAIN;
 239                 }
 240
 241                 if (no_wait)
 242                         return -EBUSY;
 243
 244                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 245
 246                 if (unlikely(ret))
 247                         return ret;
 248         }
 249
 250         if (use_ticket) {
 251                 bool wake_up = false;
 252
 253                 /**
 254                  * Wake up waiters that may need to recheck for deadlock,
 255                  * if we decreased the sequence number.
 256                  */
 257                 if (unlikely((bo->val_seq - ticket->stamp <= LONG_MAX)
 258                              || !bo->seq_valid))
 259                         wake_up = true;
 260
 261                 /*
 262                  * In the worst case with memory ordering these values can be
 263                  * seen in the wrong order. However since we call wake_up_all
 264                  * in that case, this will hopefully not pose a problem,
 265                  * and the worst case would only cause someone to accidentally
 266                  * hit -EAGAIN in ttm_bo_reserve when they see old value of
 267                  * val_seq. However this would only happen if seq_valid was
 268                  * written before val_seq was, and just means some slightly
 269                  * increased cpu usage
 270                  */
 271                 bo->val_seq = ticket->stamp;
 272                 bo->seq_valid = true;
 273                 if (wake_up)
 274                         wake_up_all(&bo->event_queue);
 275         } else {
 276                 bo->seq_valid = false;
 277         }
 278
 279         return 0;
 280 }
 281 EXPORT_SYMBOL(ttm_bo_reserve);
 282
 283 static void ttm_bo_ref_bug(struct kref *list_kref)
 284 {
 285         BUG();
 286 }
 287
 288 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 289                          bool never_free)
 290 {
 291         kref_sub(&bo->list_kref, count,
 292                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 293 }
 294
 295 int ttm_bo_reserve(struct ttm_buffer_object *bo,
 296                    bool interruptible,
 297                    bool no_wait, bool use_ticket,
 298                    struct ww_acquire_ctx *ticket)
 299 {
 300         struct ttm_bo_global *glob = bo->glob;
 301         int put_count = 0;
 302         int ret;
 303
 304         ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_ticket,
 305                                     ticket);
 306         if (likely(ret == 0)) {
 307                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 308                 put_count = ttm_bo_del_from_lru(bo);
 309                 lockmgr(&glob->lru_lock, LK_RELEASE);
 310                 ttm_bo_list_ref_sub(bo, put_count, true);
 311         }
 312
 313         return ret;
 314 }
 315
 316 int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
 317                                   bool interruptible,
 318                                   struct ww_acquire_ctx *ticket)
 319 {
 320         bool wake_up = false;
 321         int ret;
 322
 323         while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) {
 324                 WARN_ON(bo->seq_valid && ticket->stamp == bo->val_seq);
 325
 326                 ret = ttm_bo_wait_unreserved(bo, interruptible);
 327
 328                 if (unlikely(ret))
 329                         return ret;
 330         }
 331
 332         if (bo->val_seq - ticket->stamp < LONG_MAX || !bo->seq_valid)
 333                 wake_up = true;
 334
 335         /**
 336          * Wake up waiters that may need to recheck for deadlock,
 337          * if we decreased the sequence number.
 338          */
 339         bo->val_seq = ticket->stamp;
 340         bo->seq_valid = true;
 341         if (wake_up)
 342                 wake_up_all(&bo->event_queue);
 343
 344         return 0;
 345 }
 346
 347 int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 348                             bool interruptible, struct ww_acquire_ctx *ticket)
 349 {
 350         struct ttm_bo_global *glob = bo->glob;
 351         int put_count, ret;
 352
 353         ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, ticket);
 354         if (likely(!ret)) {
 355                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 356                 put_count = ttm_bo_del_from_lru(bo);
 357                 lockmgr(&glob->lru_lock, LK_RELEASE);
 358                 ttm_bo_list_ref_sub(bo, put_count, true);
 359         }
 360         return ret;
 361 }
 362 EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
 363
 364 /*
 365  * Must interlock with event_queue to avoid race against
 366  * wait_event_common() which can cause wait_event_common()
 367  * to become stuck.
 368  */
 369 static void
 370 ttm_bo_unreserve_core(struct ttm_buffer_object *bo)
 371 {
 372         lockmgr(&bo->event_queue.lock, LK_EXCLUSIVE);
 373         atomic_set(&bo->reserved, 0);
 374         lockmgr(&bo->event_queue.lock, LK_RELEASE);
 375         wake_up_all(&bo->event_queue);
 376 }
 377
 378 void ttm_bo_unreserve_ticket_locked(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
 379 {
 380         ttm_bo_add_to_lru(bo);
 381         ttm_bo_unreserve_core(bo);
 382 }
 383
 384 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 385 {
 386         struct ttm_bo_global *glob = bo->glob;
 387
 388         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 389         ttm_bo_unreserve_ticket_locked(bo, NULL);
 390         lockmgr(&glob->lru_lock, LK_RELEASE);
 391 }
 392 EXPORT_SYMBOL(ttm_bo_unreserve);
 393
 394 void ttm_bo_unreserve_ticket(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
 395 {
 396         struct ttm_bo_global *glob = bo->glob;
 397
 398         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 399         ttm_bo_unreserve_ticket_locked(bo, ticket);
 400         lockmgr(&glob->lru_lock, LK_RELEASE);
 401 }
 402 EXPORT_SYMBOL(ttm_bo_unreserve_ticket);
 403
 404 /*
 405  * Call bo->mutex locked.
 406  */
 407 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 408 {
 409         struct ttm_bo_device *bdev = bo->bdev;
 410         struct ttm_bo_global *glob = bo->glob;
 411         int ret = 0;
 412         uint32_t page_flags = 0;
 413
 414         TTM_ASSERT_LOCKED(&bo->mutex);
 415         bo->ttm = NULL;
 416
 417         if (bdev->need_dma32)
 418                 page_flags |= TTM_PAGE_FLAG_DMA32;
 419
 420         switch (bo->type) {
 421         case ttm_bo_type_device:
 422                 if (zero_alloc)
 423                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 424         case ttm_bo_type_kernel:
 425                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 426                                                       page_flags, glob->dummy_read_page);
 427                 if (unlikely(bo->ttm == NULL))
 428                         ret = -ENOMEM;
 429                 break;
 430         case ttm_bo_type_sg:
 431                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 432                                                       page_flags | TTM_PAGE_FLAG_SG,
 433                                                       glob->dummy_read_page);
 434                 if (unlikely(bo->ttm == NULL)) {
 435                         ret = -ENOMEM;
 436                         break;
 437                 }
 438                 bo->ttm->sg = bo->sg;
 439                 break;
 440         default:
 441                 pr_err("Illegal buffer object type\n");
 442                 ret = -EINVAL;
 443                 break;
 444         }
 445
 446         return ret;
 447 }
 448
 449 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 450                                   struct ttm_mem_reg *mem,
 451                                   bool evict, bool interruptible,
 452                                   bool no_wait_gpu)
 453 {
 454         struct ttm_bo_device *bdev = bo->bdev;
 455         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 456         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 457         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 458         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 459         int ret = 0;
 460
 461         if (old_is_pci || new_is_pci ||
 462             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 463                 ret = ttm_mem_io_lock(old_man, true);
 464                 if (unlikely(ret != 0))
 465                         goto out_err;
 466                 ttm_bo_unmap_virtual_locked(bo);
 467                 ttm_mem_io_unlock(old_man);
 468         }
 469
 470         /*
 471          * Create and bind a ttm if required.
 472          */
 473
 474         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 475                 if (bo->ttm == NULL) {
 476                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 477                         ret = ttm_bo_add_ttm(bo, zero);
 478                         if (ret)
 479                                 goto out_err;
 480                 }
 481
 482                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 483                 if (ret)
 484                         goto out_err;
 485
 486                 if (mem->mem_type != TTM_PL_SYSTEM) {
 487                         ret = ttm_tt_bind(bo->ttm, mem);
 488                         if (ret)
 489                                 goto out_err;
 490                 }
 491
 492                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 493                         if (bdev->driver->move_notify)
 494                                 bdev->driver->move_notify(bo, mem);
 495                         bo->mem = *mem;
 496                         mem->mm_node = NULL;
 497                         goto moved;
 498                 }
 499         }
 500
 501         if (bdev->driver->move_notify)
 502                 bdev->driver->move_notify(bo, mem);
 503
 504         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 505             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 506                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 507         else if (bdev->driver->move)
 508                 ret = bdev->driver->move(bo, evict, interruptible,
 509                                          no_wait_gpu, mem);
 510         else
 511                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 512
 513         if (ret) {
 514                 if (bdev->driver->move_notify) {
 515                         struct ttm_mem_reg tmp_mem = *mem;
 516                         *mem = bo->mem;
 517                         bo->mem = tmp_mem;
 518                         bdev->driver->move_notify(bo, mem);
 519                         bo->mem = *mem;
 520                         *mem = tmp_mem;
 521                 }
 522
 523                 goto out_err;
 524         }
 525
 526 moved:
 527         if (bo->evicted) {
 528                 ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 529                 if (ret)
 530                         pr_err("Can not flush read caches\n");
 531                 bo->evicted = false;
 532         }
 533
 534         if (bo->mem.mm_node) {
 535                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 536                     bdev->man[bo->mem.mem_type].gpu_offset;
 537                 bo->cur_placement = bo->mem.placement;
 538         } else
 539                 bo->offset = 0;
 540
 541         return 0;
 542
 543 out_err:
 544         new_man = &bdev->man[bo->mem.mem_type];
 545         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 546                 ttm_tt_unbind(bo->ttm);
 547                 ttm_tt_destroy(bo->ttm);
 548                 bo->ttm = NULL;
 549         }
 550
 551         return ret;
 552 }
 553
 554 /**
 555  * Call bo::reserved.
 556  * Will release GPU memory type usage on destruction.
 557  * This is the place to put in driver specific hooks to release
 558  * driver private resources.
 559  * Will release the bo::reserved lock.
 560  */
 561
 562 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 563 {
 564         if (bo->bdev->driver->move_notify)
 565                 bo->bdev->driver->move_notify(bo, NULL);
 566
 567         if (bo->ttm) {
 568                 ttm_tt_unbind(bo->ttm);
 569                 ttm_tt_destroy(bo->ttm);
 570                 bo->ttm = NULL;
 571         }
 572         ttm_bo_mem_put(bo, &bo->mem);
 573         ttm_bo_unreserve_core(bo);
 574
 575         /*
 576          * Since the final reference to this bo may not be dropped by
 577          * the current task we have to put a memory barrier here to make
 578          * sure the changes done in this function are always visible.
 579          *
 580          * This function only needs protection against the final kref_put.
 581          */
 582         cpu_mfence();
 583 }
 584
 585 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 586 {
 587         struct ttm_bo_device *bdev = bo->bdev;
 588         struct ttm_bo_global *glob = bo->glob;
 589         struct ttm_bo_driver *driver = bdev->driver;
 590         void *sync_obj = NULL;
 591         int put_count;
 592         int ret;
 593
 594         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 595         ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 596
 597         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 598         (void) ttm_bo_wait(bo, false, false, true);
 599         if (!ret && !bo->sync_obj) {
 600                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 601                 put_count = ttm_bo_del_from_lru(bo);
 602
 603                 lockmgr(&glob->lru_lock, LK_RELEASE);
 604                 ttm_bo_cleanup_memtype_use(bo);
 605
 606                 ttm_bo_list_ref_sub(bo, put_count, true);
 607
 608                 return;
 609         }
 610         if (bo->sync_obj)
 611                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 612         lockmgr(&bdev->fence_lock, LK_RELEASE);
 613
 614         if (!ret) {
 615
 616                 /*
 617                  * Make NO_EVICT bos immediately available to
 618                  * shrinkers, now that they are queued for
 619                  * destruction.
 620                  */
 621                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 622                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 623                         ttm_bo_add_to_lru(bo);
 624                 }
 625
 626                 ttm_bo_unreserve_core(bo);
 627         }
 628
 629         kref_get(&bo->list_kref);
 630         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 631         lockmgr(&glob->lru_lock, LK_RELEASE);
 632
 633         if (sync_obj) {
 634                 driver->sync_obj_flush(sync_obj);
 635                 driver->sync_obj_unref(&sync_obj);
 636         }
 637         schedule_delayed_work(&bdev->wq,
 638                               ((hz / 100) < 1) ? 1 : hz / 100);
 639 }
 640
 641 /**
 642  * function ttm_bo_cleanup_refs_and_unlock
 643  * If bo idle, remove from delayed- and lru lists, and unref.
 644  * If not idle, do nothing.
 645  *
 646  * Must be called with lru_lock and reservation held, this function
 647  * will drop both before returning.
 648  *
 649  * @interruptible         Any sleeps should occur interruptibly.
 650  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 651  */
 652
 653 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 654                                           bool interruptible,
 655                                           bool no_wait_gpu)
 656 {
 657         struct ttm_bo_device *bdev = bo->bdev;
 658         struct ttm_bo_driver *driver = bdev->driver;
 659         struct ttm_bo_global *glob = bo->glob;
 660         int put_count;
 661         int ret;
 662
 663         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 664         ret = ttm_bo_wait(bo, false, false, true);
 665
 666         if (ret && !no_wait_gpu) {
 667                 void *sync_obj;
 668
 669                 /*
 670                  * Take a reference to the fence and unreserve,
 671                  * at this point the buffer should be dead, so
 672                  * no new sync objects can be attached.
 673                  */
 674                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
 675                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 676
 677                 ttm_bo_unreserve_core(bo);
 678                 lockmgr(&glob->lru_lock, LK_RELEASE);
 679
 680                 ret = driver->sync_obj_wait(sync_obj, false, interruptible);
 681                 driver->sync_obj_unref(&sync_obj);
 682                 if (ret)
 683                         return ret;
 684
 685                 /*
 686                  * remove sync_obj with ttm_bo_wait, the wait should be
 687                  * finished, and no new wait object should have been added.
 688                  */
 689                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 690                 ret = ttm_bo_wait(bo, false, false, true);
 691                 WARN_ON(ret);
 692                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 693                 if (ret)
 694                         return ret;
 695
 696                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 697                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 698
 699                 /*
 700                  * We raced, and lost, someone else holds the reservation now,
 701                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 702                  *
 703                  * Even if it's not the case, because we finished waiting any
 704                  * delayed destruction would succeed, so just return success
 705                  * here.
 706                  */
 707                 if (ret) {
 708                         lockmgr(&glob->lru_lock, LK_RELEASE);
 709                         return 0;
 710                 }
 711         } else
 712                 lockmgr(&bdev->fence_lock, LK_RELEASE);
 713
 714         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 715                 ttm_bo_unreserve_core(bo);
 716                 lockmgr(&glob->lru_lock, LK_RELEASE);
 717                 return ret;
 718         }
 719
 720         put_count = ttm_bo_del_from_lru(bo);
 721         list_del_init(&bo->ddestroy);
 722         ++put_count;
 723
 724         lockmgr(&glob->lru_lock, LK_RELEASE);
 725         ttm_bo_cleanup_memtype_use(bo);
 726
 727         ttm_bo_list_ref_sub(bo, put_count, true);
 728
 729         return 0;
 730 }
 731
 732 /**
 733  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 734  * encountered buffers.
 735  */
 736
 737 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 738 {
 739         struct ttm_bo_global *glob = bdev->glob;
 740         struct ttm_buffer_object *entry = NULL;
 741         int ret = 0;
 742
 743         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 744         if (list_empty(&bdev->ddestroy))
 745                 goto out_unlock;
 746
 747         entry = list_first_entry(&bdev->ddestroy,
 748                 struct ttm_buffer_object, ddestroy);
 749         kref_get(&entry->list_kref);
 750
 751         for (;;) {
 752                 struct ttm_buffer_object *nentry = NULL;
 753
 754                 if (entry->ddestroy.next != &bdev->ddestroy) {
 755                         nentry = list_first_entry(&entry->ddestroy,
 756                                 struct ttm_buffer_object, ddestroy);
 757                         kref_get(&nentry->list_kref);
 758                 }
 759
 760                 ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);
 761                 if (remove_all && ret) {
 762                         lockmgr(&glob->lru_lock, LK_RELEASE);
 763                         ret = ttm_bo_reserve_nolru(entry, false, false,
 764                                                    false, 0);
 765                         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 766                 }
 767
 768                 if (!ret)
 769                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 770                                                              !remove_all);
 771                 else
 772                         lockmgr(&glob->lru_lock, LK_RELEASE);
 773
 774                 kref_put(&entry->list_kref, ttm_bo_release_list);
 775                 entry = nentry;
 776
 777                 if (ret || !entry)
 778                         goto out;
 779
 780                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 781                 if (list_empty(&entry->ddestroy))
 782                         break;
 783         }
 784
 785 out_unlock:
 786         lockmgr(&glob->lru_lock, LK_RELEASE);
 787 out:
 788         if (entry)
 789                 kref_put(&entry->list_kref, ttm_bo_release_list);
 790         return ret;
 791 }
 792
 793 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 794 {
 795         struct ttm_bo_device *bdev =
 796             container_of(work, struct ttm_bo_device, wq.work);
 797
 798         if (ttm_bo_delayed_delete(bdev, false)) {
 799                 schedule_delayed_work(&bdev->wq,
 800                                       ((hz / 100) < 1) ? 1 : hz / 100);
 801         }
 802 }
 803
 804 /*
 805  * NOTE: bdev->vm_lock already held on call, this function release it.
 806  */
 807 static void ttm_bo_release(struct kref *kref)
 808 {
 809         struct ttm_buffer_object *bo =
 810             container_of(kref, struct ttm_buffer_object, kref);
 811         struct ttm_bo_device *bdev = bo->bdev;
 812         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 813         int release_active;
 814
 815         if (atomic_read(&bo->kref.refcount) > 0) {
 816                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 817                 return;
 818         }
 819         if (likely(bo->vm_node != NULL)) {
 820                 RB_REMOVE(ttm_bo_device_buffer_objects,
 821                                 &bdev->addr_space_rb, bo);
 822                 drm_mm_put_block(bo->vm_node);
 823                 bo->vm_node = NULL;
 824         }
 825
 826         /*
 827          * Should we clean up our implied list_kref?  Because ttm_bo_release()
 828          * can be called reentrantly due to races (this may not be true any
 829          * more with the lock management changes in the deref), it is possible
 830          * to get here twice, but there's only one list_kref ref to drop and
 831          * in the other path 'bo' can be kfree()d by another thread the
 832          * instant we release our lock.
 833          */
 834         release_active = test_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 835         if (release_active) {
 836                 clear_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
 837                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 838                 ttm_mem_io_lock(man, false);
 839                 ttm_mem_io_free_vm(bo);
 840                 ttm_mem_io_unlock(man);
 841                 ttm_bo_cleanup_refs_or_queue(bo);
 842                 kref_put(&bo->list_kref, ttm_bo_release_list);
 843         } else {
 844                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 845         }
 846 }
 847
 848 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 849 {
 850         struct ttm_buffer_object *bo = *p_bo;
 851         struct ttm_bo_device *bdev = bo->bdev;
 852
 853         *p_bo = NULL;
 854         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
 855         if (kref_put(&bo->kref, ttm_bo_release) == 0)
 856                 lockmgr(&bdev->vm_lock, LK_RELEASE);
 857 }
 858 EXPORT_SYMBOL(ttm_bo_unref);
 859
 860 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 861 {
 862         return cancel_delayed_work_sync(&bdev->wq);
 863 }
 864 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 865
 866 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 867 {
 868         if (resched)
 869                 schedule_delayed_work(&bdev->wq,
 870                                       ((hz / 100) < 1) ? 1 : hz / 100);
 871 }
 872 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 873
 874 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 875                         bool no_wait_gpu)
 876 {
 877         struct ttm_bo_device *bdev = bo->bdev;
 878         struct ttm_mem_reg evict_mem;
 879         struct ttm_placement placement;
 880         int ret = 0;
 881
 882         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
 883         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 884         lockmgr(&bdev->fence_lock, LK_RELEASE);
 885
 886         if (unlikely(ret != 0)) {
 887                 if (ret != -ERESTARTSYS) {
 888                         pr_err("Failed to expire sync object before buffer eviction\n");
 889                 }
 890                 goto out;
 891         }
 892
 893         BUG_ON(!ttm_bo_is_reserved(bo));
 894
 895         evict_mem = bo->mem;
 896         evict_mem.mm_node = NULL;
 897         evict_mem.bus.io_reserved_vm = false;
 898         evict_mem.bus.io_reserved_count = 0;
 899
 900         placement.num_placement = 0;
 901         placement.num_busy_placement = 0;
 902         bdev->driver->evict_flags(bo, &placement);
 903         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 904                                 no_wait_gpu);
 905         if (ret) {
 906                 if (ret != -ERESTARTSYS) {
 907                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 908                                bo);
 909                         ttm_bo_mem_space_debug(bo, &placement);
 910                 }
 911                 goto out;
 912         }
 913
 914         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 915                                      no_wait_gpu);
 916         if (ret) {
 917                 if (ret != -ERESTARTSYS)
 918                         pr_err("Buffer eviction failed\n");
 919                 ttm_bo_mem_put(bo, &evict_mem);
 920                 goto out;
 921         }
 922         bo->evicted = true;
 923 out:
 924         return ret;
 925 }
 926
 927 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 928                                 uint32_t mem_type,
 929                                 bool interruptible,
 930                                 bool no_wait_gpu)
 931 {
 932         struct ttm_bo_global *glob = bdev->glob;
 933         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 934         struct ttm_buffer_object *bo;
 935         int ret = -EBUSY, put_count;
 936
 937         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 938         list_for_each_entry(bo, &man->lru, lru) {
 939                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
 940                 if (!ret)
 941                         break;
 942         }
 943
 944         if (ret) {
 945                 lockmgr(&glob->lru_lock, LK_RELEASE);
 946                 return ret;
 947         }
 948
 949         kref_get(&bo->list_kref);
 950
 951         if (!list_empty(&bo->ddestroy)) {
 952                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 953                                                      no_wait_gpu);
 954                 kref_put(&bo->list_kref, ttm_bo_release_list);
 955                 return ret;
 956         }
 957
 958         put_count = ttm_bo_del_from_lru(bo);
 959         lockmgr(&glob->lru_lock, LK_RELEASE);
 960
 961         BUG_ON(ret != 0);
 962
 963         ttm_bo_list_ref_sub(bo, put_count, true);
 964
 965         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 966         ttm_bo_unreserve(bo);
 967
 968         kref_put(&bo->list_kref, ttm_bo_release_list);
 969         return ret;
 970 }
 971
 972 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 973 {
 974         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 975
 976         if (mem->mm_node)
 977                 (*man->func->put_node)(man, mem);
 978 }
 979 EXPORT_SYMBOL(ttm_bo_mem_put);
 980
 981 /**
 982  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 983  * space, or we've evicted everything and there isn't enough space.
 984  */
 985 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 986                                         uint32_t mem_type,
 987                                         const struct ttm_place *place,
 988                                         struct ttm_mem_reg *mem,
 989                                         bool interruptible,
 990                                         bool no_wait_gpu)
 991 {
 992         struct ttm_bo_device *bdev = bo->bdev;
 993         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 994         int ret;
 995
 996         do {
 997                 ret = (*man->func->get_node)(man, bo, place, mem);
 998                 if (unlikely(ret != 0))
 999                         return ret;
1000                 if (mem->mm_node)
1001                         break;
1002                 ret = ttm_mem_evict_first(bdev, mem_type,
1003                                           interruptible, no_wait_gpu);
1004                 if (unlikely(ret != 0))
1005                         return ret;
1006         } while (1);
1007         if (mem->mm_node == NULL)
1008                 return -ENOMEM;
1009         mem->mem_type = mem_type;
1010         return 0;
1011 }
1012
1013 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
1014                                       uint32_t cur_placement,
1015                                       uint32_t proposed_placement)
1016 {
1017         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
1018         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
1019
1020         /**
1021          * Keep current caching if possible.
1022          */
1023
1024         if ((cur_placement & caching) != 0)
1025                 result |= (cur_placement & caching);
1026         else if ((man->default_caching & caching) != 0)
1027                 result |= man->default_caching;
1028         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
1029                 result |= TTM_PL_FLAG_CACHED;
1030         else if ((TTM_PL_FLAG_WC & caching) != 0)
1031                 result |= TTM_PL_FLAG_WC;
1032         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
1033                 result |= TTM_PL_FLAG_UNCACHED;
1034
1035         return result;
1036 }
1037
1038 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1039                                  uint32_t mem_type,
1040                                  const struct ttm_place *place,
1041                                  uint32_t *masked_placement)
1042 {
1043         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1044
1045         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
1046                 return false;
1047
1048         if ((place->flags & man->available_caching) == 0)
1049                 return false;
1050
1051         cur_flags |= (place->flags & man->available_caching);
1052
1053         *masked_placement = cur_flags;
1054         return true;
1055 }
1056
1057 /**
1058  * Creates space for memory region @mem according to its type.
1059  *
1060  * This function first searches for free space in compatible memory types in
1061  * the priority order defined by the driver.  If free space isn't found, then
1062  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1063  * space.
1064  */
1065 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1066                         struct ttm_placement *placement,
1067                         struct ttm_mem_reg *mem,
1068                         bool interruptible,
1069                         bool no_wait_gpu)
1070 {
1071         struct ttm_bo_device *bdev = bo->bdev;
1072         struct ttm_mem_type_manager *man;
1073         uint32_t mem_type = TTM_PL_SYSTEM;
1074         uint32_t cur_flags = 0;
1075         bool type_found = false;
1076         bool type_ok = false;
1077         bool has_erestartsys = false;
1078         int i, ret;
1079
1080         mem->mm_node = NULL;
1081         for (i = 0; i < placement->num_placement; ++i) {
1082                 const struct ttm_place *place = &placement->placement[i];
1083
1084                 ret = ttm_mem_type_from_place(place, &mem_type);
1085                 if (ret)
1086                         return ret;
1087                 man = &bdev->man[mem_type];
1088
1089                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
1090                                                 &cur_flags);
1091
1092                 if (!type_ok)
1093                         continue;
1094
1095                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1096                                                   cur_flags);
1097                 /*
1098                  * Use the access and other non-mapping-related flag bits from
1099                  * the memory placement flags to the current flags
1100                  */
1101                 ttm_flag_masked(&cur_flags, place->flags,
1102                                 ~TTM_PL_MASK_MEMTYPE);
1103
1104                 if (mem_type == TTM_PL_SYSTEM)
1105                         break;
1106
1107                 if (man->has_type && man->use_type) {
1108                         type_found = true;
1109                         ret = (*man->func->get_node)(man, bo, place, mem);
1110                         if (unlikely(ret))
1111                                 return ret;
1112                 }
1113                 if (mem->mm_node)
1114                         break;
1115         }
1116
1117         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1118                 mem->mem_type = mem_type;
1119                 mem->placement = cur_flags;
1120                 return 0;
1121         }
1122
1123         if (!type_found)
1124                 return -EINVAL;
1125
1126         for (i = 0; i < placement->num_busy_placement; ++i) {
1127                 const struct ttm_place *place = &placement->busy_placement[i];
1128
1129                 ret = ttm_mem_type_from_place(place, &mem_type);
1130                 if (ret)
1131                         return ret;
1132                 man = &bdev->man[mem_type];
1133                 if (!man->has_type)
1134                         continue;
1135                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1136                         continue;
1137
1138                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1139                                                   cur_flags);
1140                 /*
1141                  * Use the access and other non-mapping-related flag bits from
1142                  * the memory placement flags to the current flags
1143                  */
1144                 ttm_flag_masked(&cur_flags, place->flags,
1145                                 ~TTM_PL_MASK_MEMTYPE);
1146
1147                 if (mem_type == TTM_PL_SYSTEM) {
1148                         mem->mem_type = mem_type;
1149                         mem->placement = cur_flags;
1150                         mem->mm_node = NULL;
1151                         return 0;
1152                 }
1153
1154                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
1155                                                 interruptible, no_wait_gpu);
1156                 if (ret == 0 && mem->mm_node) {
1157                         mem->placement = cur_flags;
1158                         return 0;
1159                 }
1160                 if (ret == -ERESTARTSYS)
1161                         has_erestartsys = true;
1162         }
1163         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1164         return ret;
1165 }
1166 EXPORT_SYMBOL(ttm_bo_mem_space);
1167
1168 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1169                         struct ttm_placement *placement,
1170                         bool interruptible,
1171                         bool no_wait_gpu)
1172 {
1173         int ret = 0;
1174         struct ttm_mem_reg mem;
1175         struct ttm_bo_device *bdev = bo->bdev;
1176
1177         BUG_ON(!ttm_bo_is_reserved(bo));
1178
1179         /*
1180          * FIXME: It's possible to pipeline buffer moves.
1181          * Have the driver move function wait for idle when necessary,
1182          * instead of doing it here.
1183          */
1184         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1185         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
1186         lockmgr(&bdev->fence_lock, LK_RELEASE);
1187         if (ret)
1188                 return ret;
1189         mem.num_pages = bo->num_pages;
1190         mem.size = mem.num_pages << PAGE_SHIFT;
1191         mem.page_alignment = bo->mem.page_alignment;
1192         mem.bus.io_reserved_vm = false;
1193         mem.bus.io_reserved_count = 0;
1194         /*
1195          * Determine where to move the buffer.
1196          */
1197         ret = ttm_bo_mem_space(bo, placement, &mem,
1198                                interruptible, no_wait_gpu);
1199         if (ret)
1200                 goto out_unlock;
1201         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1202                                      interruptible, no_wait_gpu);
1203 out_unlock:
1204         if (ret && mem.mm_node)
1205                 ttm_bo_mem_put(bo, &mem);
1206         return ret;
1207 }
1208
1209 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1210                               struct ttm_mem_reg *mem,
1211                               uint32_t *new_flags)
1212 {
1213         int i;
1214
1215         for (i = 0; i < placement->num_placement; i++) {
1216                 const struct ttm_place *heap = &placement->placement[i];
1217                 if (mem->mm_node &&
1218                     (mem->start < heap->fpfn ||
1219                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1220                         continue;
1221
1222                 *new_flags = heap->flags;
1223                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1224                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1225                         return true;
1226         }
1227
1228         for (i = 0; i < placement->num_busy_placement; i++) {
1229                 const struct ttm_place *heap = &placement->busy_placement[i];
1230                 if (mem->mm_node &&
1231                     (mem->start < heap->fpfn ||
1232                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1233                         continue;
1234
1235                 *new_flags = heap->flags;
1236                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1237                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1238                         return true;
1239         }
1240
1241         return false;
1242 }
1243
1244 int ttm_bo_validate(struct ttm_buffer_object *bo,
1245                         struct ttm_placement *placement,
1246                         bool interruptible,
1247                         bool no_wait_gpu)
1248 {
1249         int ret;
1250         uint32_t new_flags;
1251
1252         BUG_ON(!ttm_bo_is_reserved(bo));
1253         /*
1254          * Check whether we need to move buffer.
1255          */
1256         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1257                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1258                                          no_wait_gpu);
1259                 if (ret)
1260                         return ret;
1261         } else {
1262                 /*
1263                  * Use the access and other non-mapping-related flag bits from
1264                  * the compatible memory placement flags to the active flags
1265                  */
1266                 ttm_flag_masked(&bo->mem.placement, new_flags,
1267                                 ~TTM_PL_MASK_MEMTYPE);
1268         }
1269         /*
1270          * We might need to add a TTM.
1271          */
1272         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1273                 ret = ttm_bo_add_ttm(bo, true);
1274                 if (ret)
1275                         return ret;
1276         }
1277         return 0;
1278 }
1279 EXPORT_SYMBOL(ttm_bo_validate);
1280
1281 int ttm_bo_init(struct ttm_bo_device *bdev,
1282                 struct ttm_buffer_object *bo,
1283                 unsigned long size,
1284                 enum ttm_bo_type type,
1285                 struct ttm_placement *placement,
1286                 uint32_t page_alignment,
1287                 bool interruptible,
1288                 struct vm_object *persistent_swap_storage,
1289                 size_t acc_size,
1290                 struct sg_table *sg,
1291                 void (*destroy) (struct ttm_buffer_object *))
1292 {
1293         int ret = 0;
1294         unsigned long num_pages;
1295         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1296
1297         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1298         if (ret) {
1299                 pr_err("Out of kernel memory\n");
1300                 if (destroy)
1301                         (*destroy)(bo);
1302                 else
1303                         kfree(bo);
1304                 return -ENOMEM;
1305         }
1306
1307         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1308         if (num_pages == 0) {
1309                 pr_err("Illegal buffer object size\n");
1310                 if (destroy)
1311                         (*destroy)(bo);
1312                 else
1313                         kfree(bo);
1314                 ttm_mem_global_free(mem_glob, acc_size);
1315                 return -EINVAL;
1316         }
1317         bo->destroy = destroy;
1318
1319         kref_init(&bo->kref);
1320         kref_init(&bo->list_kref);
1321         atomic_set(&bo->cpu_writers, 0);
1322         atomic_set(&bo->reserved, 1);
1323         init_waitqueue_head(&bo->event_queue);
1324         INIT_LIST_HEAD(&bo->lru);
1325         INIT_LIST_HEAD(&bo->ddestroy);
1326         INIT_LIST_HEAD(&bo->swap);
1327         INIT_LIST_HEAD(&bo->io_reserve_lru);
1328         /*bzero(&bo->vm_rb, sizeof(bo->vm_rb));*/
1329         bo->bdev = bdev;
1330         bo->glob = bdev->glob;
1331         bo->type = type;
1332         bo->num_pages = num_pages;
1333         bo->mem.size = num_pages << PAGE_SHIFT;
1334         bo->mem.mem_type = TTM_PL_SYSTEM;
1335         bo->mem.num_pages = bo->num_pages;
1336         bo->mem.mm_node = NULL;
1337         bo->mem.page_alignment = page_alignment;
1338         bo->mem.bus.io_reserved_vm = false;
1339         bo->mem.bus.io_reserved_count = 0;
1340         bo->priv_flags = 0;
1341         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1342         bo->seq_valid = false;
1343         bo->persistent_swap_storage = persistent_swap_storage;
1344         bo->acc_size = acc_size;
1345         bo->sg = sg;
1346         atomic_inc(&bo->glob->bo_count);
1347
1348         /*
1349          * Mirror ref from kref_init() for list_kref.
1350          */
1351         set_bit(TTM_BO_PRIV_FLAG_ACTIVE, &bo->priv_flags);
1352
1353         /*
1354          * For ttm_bo_type_device buffers, allocate
1355          * address space from the device.
1356          */
1357         if (bo->type == ttm_bo_type_device ||
1358             bo->type == ttm_bo_type_sg) {
1359                 ret = ttm_bo_setup_vm(bo);
1360                 if (ret)
1361                         goto out_err;
1362         }
1363
1364         ret = ttm_bo_validate(bo, placement, interruptible, false);
1365         if (ret)
1366                 goto out_err;
1367
1368         ttm_bo_unreserve(bo);
1369         return 0;
1370
1371 out_err:
1372         ttm_bo_unreserve(bo);
1373         ttm_bo_unref(&bo);
1374
1375         return ret;
1376 }
1377 EXPORT_SYMBOL(ttm_bo_init);
1378
1379 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1380                        unsigned long bo_size,
1381                        unsigned struct_size)
1382 {
1383         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1384         size_t size = 0;
1385
1386         size += ttm_round_pot(struct_size);
1387         size += PAGE_ALIGN(npages * sizeof(void *));
1388         size += ttm_round_pot(sizeof(struct ttm_tt));
1389         return size;
1390 }
1391 EXPORT_SYMBOL(ttm_bo_acc_size);
1392
1393 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1394                            unsigned long bo_size,
1395                            unsigned struct_size)
1396 {
1397         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1398         size_t size = 0;
1399
1400         size += ttm_round_pot(struct_size);
1401         size += PAGE_ALIGN(npages * sizeof(void *));
1402         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1403         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1404         return size;
1405 }
1406 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1407
1408 int ttm_bo_create(struct ttm_bo_device *bdev,
1409                         unsigned long size,
1410                         enum ttm_bo_type type,
1411                         struct ttm_placement *placement,
1412                         uint32_t page_alignment,
1413                         bool interruptible,
1414                         struct vm_object *persistent_swap_storage,
1415                         struct ttm_buffer_object **p_bo)
1416 {
1417         struct ttm_buffer_object *bo;
1418         size_t acc_size;
1419         int ret;
1420
1421         *p_bo = NULL;
1422         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1423         if (unlikely(bo == NULL))
1424                 return -ENOMEM;
1425
1426         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1427         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1428                           interruptible, persistent_swap_storage, acc_size,
1429                           NULL, NULL);
1430         if (likely(ret == 0))
1431                 *p_bo = bo;
1432
1433         return ret;
1434 }
1435 EXPORT_SYMBOL(ttm_bo_create);
1436
1437 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1438                                         unsigned mem_type, bool allow_errors)
1439 {
1440         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1441         struct ttm_bo_global *glob = bdev->glob;
1442         int ret;
1443
1444         /*
1445          * Can't use standard list traversal since we're unlocking.
1446          */
1447
1448         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1449         while (!list_empty(&man->lru)) {
1450                 lockmgr(&glob->lru_lock, LK_RELEASE);
1451                 ret = ttm_mem_evict_first(bdev, mem_type, false, false);
1452                 if (ret) {
1453                         if (allow_errors) {
1454                                 return ret;
1455                         } else {
1456                                 pr_err("Cleanup eviction failed\n");
1457                         }
1458                 }
1459                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1460         }
1461         lockmgr(&glob->lru_lock, LK_RELEASE);
1462         return 0;
1463 }
1464
1465 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1466 {
1467         struct ttm_mem_type_manager *man;
1468         int ret = -EINVAL;
1469
1470         if (mem_type >= TTM_NUM_MEM_TYPES) {
1471                 pr_err("Illegal memory type %d\n", mem_type);
1472                 return ret;
1473         }
1474         man = &bdev->man[mem_type];
1475
1476         if (!man->has_type) {
1477                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1478                        mem_type);
1479                 return ret;
1480         }
1481
1482         man->use_type = false;
1483         man->has_type = false;
1484
1485         ret = 0;
1486         if (mem_type > 0) {
1487                 ttm_bo_force_list_clean(bdev, mem_type, false);
1488
1489                 ret = (*man->func->takedown)(man);
1490         }
1491
1492         return ret;
1493 }
1494 EXPORT_SYMBOL(ttm_bo_clean_mm);
1495
1496 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1497 {
1498         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1499
1500         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1501                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1502                 return -EINVAL;
1503         }
1504
1505         if (!man->has_type) {
1506                 pr_err("Memory type %u has not been initialized\n", mem_type);
1507                 return 0;
1508         }
1509
1510         return ttm_bo_force_list_clean(bdev, mem_type, true);
1511 }
1512 EXPORT_SYMBOL(ttm_bo_evict_mm);
1513
1514 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1515                         unsigned long p_size)
1516 {
1517         int ret = -EINVAL;
1518         struct ttm_mem_type_manager *man;
1519
1520         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1521         man = &bdev->man[type];
1522         BUG_ON(man->has_type);
1523         man->io_reserve_fastpath = true;
1524         man->use_io_reserve_lru = false;
1525         lockinit(&man->io_reserve_mutex, "ttmman", 0, LK_CANRECURSE);
1526         INIT_LIST_HEAD(&man->io_reserve_lru);
1527
1528         ret = bdev->driver->init_mem_type(bdev, type, man);
1529         if (ret)
1530                 return ret;
1531         man->bdev = bdev;
1532
1533         ret = 0;
1534         if (type != TTM_PL_SYSTEM) {
1535                 ret = (*man->func->init)(man, p_size);
1536                 if (ret)
1537                         return ret;
1538         }
1539         man->has_type = true;
1540         man->use_type = true;
1541         man->size = p_size;
1542
1543         INIT_LIST_HEAD(&man->lru);
1544
1545         return 0;
1546 }
1547 EXPORT_SYMBOL(ttm_bo_init_mm);
1548
1549 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1550 {
1551         struct ttm_bo_global *glob =
1552                 container_of(kobj, struct ttm_bo_global, kobj);
1553
1554         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1555         __free_page(glob->dummy_read_page);
1556         kfree(glob);
1557 }
1558
1559 void ttm_bo_global_release(struct drm_global_reference *ref)
1560 {
1561         struct ttm_bo_global *glob = ref->object;
1562
1563         kobject_del(&glob->kobj);
1564         kobject_put(&glob->kobj);
1565 }
1566 EXPORT_SYMBOL(ttm_bo_global_release);
1567
1568 int ttm_bo_global_init(struct drm_global_reference *ref)
1569 {
1570         struct ttm_bo_global_ref *bo_ref =
1571                 container_of(ref, struct ttm_bo_global_ref, ref);
1572         struct ttm_bo_global *glob = ref->object;
1573         int ret;
1574
1575         lockinit(&glob->device_list_mutex, "ttmdlm", 0, LK_CANRECURSE);
1576         lockinit(&glob->lru_lock, "ttmlru", 0, LK_CANRECURSE);
1577         glob->mem_glob = bo_ref->mem_glob;
1578         glob->dummy_read_page = (struct page *)vm_page_alloc_contig(
1579             0, VM_MAX_ADDRESS, PAGE_SIZE, 0, 1*PAGE_SIZE, VM_MEMATTR_UNCACHEABLE);
1580
1581         if (unlikely(glob->dummy_read_page == NULL)) {
1582                 ret = -ENOMEM;
1583                 goto out_no_drp;
1584         }
1585
1586         INIT_LIST_HEAD(&glob->swap_lru);
1587         INIT_LIST_HEAD(&glob->device_list);
1588
1589         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1590         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1591         if (unlikely(ret != 0)) {
1592                 pr_err("Could not register buffer object swapout\n");
1593                 goto out_no_shrink;
1594         }
1595
1596         atomic_set(&glob->bo_count, 0);
1597
1598         ret = kobject_init_and_add(
1599                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1600         if (unlikely(ret != 0))
1601                 kobject_put(&glob->kobj);
1602         return ret;
1603 out_no_shrink:
1604         __free_page(glob->dummy_read_page);
1605 out_no_drp:
1606         kfree(glob);
1607         return ret;
1608 }
1609 EXPORT_SYMBOL(ttm_bo_global_init);
1610
1611
1612 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1613 {
1614         int ret = 0;
1615         unsigned i = TTM_NUM_MEM_TYPES;
1616         struct ttm_mem_type_manager *man;
1617         struct ttm_bo_global *glob = bdev->glob;
1618
1619         while (i--) {
1620                 man = &bdev->man[i];
1621                 if (man->has_type) {
1622                         man->use_type = false;
1623                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1624                                 ret = -EBUSY;
1625                                 pr_err("DRM memory manager type %d is not clean\n",
1626                                        i);
1627                         }
1628                         man->has_type = false;
1629                 }
1630         }
1631
1632         mutex_lock(&glob->device_list_mutex);
1633         list_del(&bdev->device_list);
1634         mutex_unlock(&glob->device_list_mutex);
1635
1636         cancel_delayed_work_sync(&bdev->wq);
1637
1638         while (ttm_bo_delayed_delete(bdev, true))
1639                 ;
1640
1641         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1642         if (list_empty(&bdev->ddestroy))
1643                 TTM_DEBUG("Delayed destroy list was clean\n");
1644
1645         if (list_empty(&bdev->man[0].lru))
1646                 TTM_DEBUG("Swap list was clean\n");
1647         lockmgr(&glob->lru_lock, LK_RELEASE);
1648
1649         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
1650         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1651         drm_mm_takedown(&bdev->addr_space_mm);
1652         lockmgr(&bdev->vm_lock, LK_RELEASE);
1653
1654         return ret;
1655 }
1656 EXPORT_SYMBOL(ttm_bo_device_release);
1657
1658 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1659                        struct ttm_bo_global *glob,
1660                        struct ttm_bo_driver *driver,
1661                        uint64_t file_page_offset,
1662                        bool need_dma32)
1663 {
1664         int ret = -EINVAL;
1665
1666         lockinit(&bdev->vm_lock, "ttmvml", 0, LK_CANRECURSE);
1667         bdev->driver = driver;
1668
1669         memset(bdev->man, 0, sizeof(bdev->man));
1670
1671         /*
1672          * Initialize the system memory buffer type.
1673          * Other types need to be driver / IOCTL initialized.
1674          */
1675         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1676         if (unlikely(ret != 0))
1677                 goto out_no_sys;
1678
1679         RB_INIT(&bdev->addr_space_rb);
1680         drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
1681
1682         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1683         INIT_LIST_HEAD(&bdev->ddestroy);
1684         bdev->dev_mapping = NULL;
1685         bdev->glob = glob;
1686         bdev->need_dma32 = need_dma32;
1687         bdev->val_seq = 0;
1688         lockinit(&bdev->fence_lock, "ttmfence", 0, LK_CANRECURSE);
1689         mutex_lock(&glob->device_list_mutex);
1690         list_add_tail(&bdev->device_list, &glob->device_list);
1691         mutex_unlock(&glob->device_list_mutex);
1692
1693         return 0;
1694 out_no_sys:
1695         return ret;
1696 }
1697 EXPORT_SYMBOL(ttm_bo_device_init);
1698
1699 /*
1700  * buffer object vm functions.
1701  */
1702
1703 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1704 {
1705         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1706
1707         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1708                 if (mem->mem_type == TTM_PL_SYSTEM)
1709                         return false;
1710
1711                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1712                         return false;
1713
1714                 if (mem->placement & TTM_PL_FLAG_CACHED)
1715                         return false;
1716         }
1717         return true;
1718 }
1719
1720 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1721 {
1722
1723         ttm_bo_release_mmap(bo);
1724         ttm_mem_io_free_vm(bo);
1725 }
1726
1727 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1728 {
1729         struct ttm_bo_device *bdev = bo->bdev;
1730         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1731
1732         ttm_mem_io_lock(man, false);
1733         ttm_bo_unmap_virtual_locked(bo);
1734         ttm_mem_io_unlock(man);
1735 }
1736
1737
1738 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1739
1740 static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo)
1741 {
1742         struct ttm_bo_device *bdev = bo->bdev;
1743
1744         /* The caller acquired bdev->vm_lock. */
1745         RB_INSERT(ttm_bo_device_buffer_objects, &bdev->addr_space_rb, bo);
1746 }
1747
1748 /**
1749  * ttm_bo_setup_vm:
1750  *
1751  * @bo: the buffer to allocate address space for
1752  *
1753  * Allocate address space in the drm device so that applications
1754  * can mmap the buffer and access the contents. This only
1755  * applies to ttm_bo_type_device objects as others are not
1756  * placed in the drm device address space.
1757  */
1758
1759 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo)
1760 {
1761         struct ttm_bo_device *bdev = bo->bdev;
1762         int ret;
1763
1764 retry_pre_get:
1765         ret = drm_mm_pre_get(&bdev->addr_space_mm);
1766         if (unlikely(ret != 0))
1767                 return ret;
1768
1769         lockmgr(&bdev->vm_lock, LK_EXCLUSIVE);
1770         bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm,
1771                                          bo->mem.num_pages, 0, 0);
1772
1773         if (unlikely(bo->vm_node == NULL)) {
1774                 ret = -ENOMEM;
1775                 goto out_unlock;
1776         }
1777
1778         bo->vm_node = drm_mm_get_block_atomic(bo->vm_node,
1779                                               bo->mem.num_pages, 0);
1780
1781         if (unlikely(bo->vm_node == NULL)) {
1782                 lockmgr(&bdev->vm_lock, LK_RELEASE);
1783                 goto retry_pre_get;
1784         }
1785
1786         ttm_bo_vm_insert_rb(bo);
1787         lockmgr(&bdev->vm_lock, LK_RELEASE);
1788         bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT;
1789
1790         return 0;
1791 out_unlock:
1792         lockmgr(&bdev->vm_lock, LK_RELEASE);
1793         return ret;
1794 }
1795
1796 int ttm_bo_wait(struct ttm_buffer_object *bo,
1797                 bool lazy, bool interruptible, bool no_wait)
1798 {
1799         struct ttm_bo_driver *driver = bo->bdev->driver;
1800         struct ttm_bo_device *bdev = bo->bdev;
1801         void *sync_obj;
1802         int ret = 0;
1803
1804         if (likely(bo->sync_obj == NULL))
1805                 return 0;
1806
1807         while (bo->sync_obj) {
1808
1809                 if (driver->sync_obj_signaled(bo->sync_obj)) {
1810                         void *tmp_obj = bo->sync_obj;
1811                         bo->sync_obj = NULL;
1812                         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1813                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1814                         driver->sync_obj_unref(&tmp_obj);
1815                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1816                         continue;
1817                 }
1818
1819                 if (no_wait)
1820                         return -EBUSY;
1821
1822                 sync_obj = driver->sync_obj_ref(bo->sync_obj);
1823                 lockmgr(&bdev->fence_lock, LK_RELEASE);
1824                 ret = driver->sync_obj_wait(sync_obj,
1825                                             lazy, interruptible);
1826                 if (unlikely(ret != 0)) {
1827                         driver->sync_obj_unref(&sync_obj);
1828                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1829                         return ret;
1830                 }
1831                 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1832                 if (likely(bo->sync_obj == sync_obj)) {
1833                         void *tmp_obj = bo->sync_obj;
1834                         bo->sync_obj = NULL;
1835                         clear_bit(TTM_BO_PRIV_FLAG_MOVING,
1836                                   &bo->priv_flags);
1837                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1838                         driver->sync_obj_unref(&sync_obj);
1839                         driver->sync_obj_unref(&tmp_obj);
1840                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1841                 } else {
1842                         lockmgr(&bdev->fence_lock, LK_RELEASE);
1843                         driver->sync_obj_unref(&sync_obj);
1844                         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1845                 }
1846         }
1847         return 0;
1848 }
1849 EXPORT_SYMBOL(ttm_bo_wait);
1850
1851 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1852 {
1853         struct ttm_bo_device *bdev = bo->bdev;
1854         int ret = 0;
1855
1856         /*
1857          * Using ttm_bo_reserve makes sure the lru lists are updated.
1858          */
1859
1860         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1861         if (unlikely(ret != 0))
1862                 return ret;
1863         lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
1864         ret = ttm_bo_wait(bo, false, true, no_wait);
1865         lockmgr(&bdev->fence_lock, LK_RELEASE);
1866         if (likely(ret == 0))
1867                 atomic_inc(&bo->cpu_writers);
1868         ttm_bo_unreserve(bo);
1869         return ret;
1870 }
1871 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1872
1873 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1874 {
1875         atomic_dec(&bo->cpu_writers);
1876 }
1877 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1878
1879 /**
1880  * A buffer object shrink method that tries to swap out the first
1881  * buffer object on the bo_global::swap_lru list.
1882  */
1883
1884 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1885 {
1886         struct ttm_bo_global *glob =
1887             container_of(shrink, struct ttm_bo_global, shrink);
1888         struct ttm_buffer_object *bo;
1889         int ret = -EBUSY;
1890         int put_count;
1891         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1892
1893         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1894         list_for_each_entry(bo, &glob->swap_lru, swap) {
1895                 ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);
1896                 if (!ret)
1897                         break;
1898         }
1899
1900         if (ret) {
1901                 lockmgr(&glob->lru_lock, LK_RELEASE);
1902                 return ret;
1903         }
1904
1905         kref_get(&bo->list_kref);
1906
1907         if (!list_empty(&bo->ddestroy)) {
1908                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1909                 kref_put(&bo->list_kref, ttm_bo_release_list);
1910                 return ret;
1911         }
1912
1913         put_count = ttm_bo_del_from_lru(bo);
1914         lockmgr(&glob->lru_lock, LK_RELEASE);
1915
1916         ttm_bo_list_ref_sub(bo, put_count, true);
1917
1918         /**
1919          * Wait for GPU, then move to system cached.
1920          */
1921
1922         lockmgr(&bo->bdev->fence_lock, LK_EXCLUSIVE);
1923         ret = ttm_bo_wait(bo, false, false, false);
1924         lockmgr(&bo->bdev->fence_lock, LK_RELEASE);
1925
1926         if (unlikely(ret != 0))
1927                 goto out;
1928
1929         if ((bo->mem.placement & swap_placement) != swap_placement) {
1930                 struct ttm_mem_reg evict_mem;
1931
1932                 evict_mem = bo->mem;
1933                 evict_mem.mm_node = NULL;
1934                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1935                 evict_mem.mem_type = TTM_PL_SYSTEM;
1936
1937                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1938                                              false, false);
1939                 if (unlikely(ret != 0))
1940                         goto out;
1941         }
1942
1943         ttm_bo_unmap_virtual(bo);
1944
1945         /**
1946          * Swap out. Buffer will be swapped in again as soon as
1947          * anyone tries to access a ttm page.
1948          */
1949
1950         if (bo->bdev->driver->swap_notify)
1951                 bo->bdev->driver->swap_notify(bo);
1952
1953         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1954 out:
1955
1956         /**
1957          *
1958          * Unreserve without putting on LRU to avoid swapping out an
1959          * already swapped buffer.
1960          */
1961
1962         ttm_bo_unreserve_core(bo);
1963         kref_put(&bo->list_kref, ttm_bo_release_list);
1964         return ret;
1965 }
1966
1967 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1968 {
1969         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1970                 ;
1971 }
1972 EXPORT_SYMBOL(ttm_bo_swapout_all);