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