drivers/gpu/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 #include <linux/reservation.h>
  44
  45 #define TTM_ASSERT_LOCKED(param)
  46 #define TTM_DEBUG(fmt, arg...)
  47 #define TTM_BO_HASH_ORDER 13
  48
  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%08llX\n", man->gpu_offset);
  78         pr_err("    size: %llu\n", 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 snprintf(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
 131 static inline uint32_t ttm_bo_type_flags(unsigned type)
 132 {
 133         return 1 << (type);
 134 }
 135
 136 static void ttm_bo_release_list(struct kref *list_kref)
 137 {
 138         struct ttm_buffer_object *bo =
 139             container_of(list_kref, struct ttm_buffer_object, list_kref);
 140         struct ttm_bo_device *bdev = bo->bdev;
 141         size_t acc_size = bo->acc_size;
 142
 143         BUG_ON(atomic_read(&bo->list_kref.refcount));
 144         BUG_ON(atomic_read(&bo->kref.refcount));
 145         BUG_ON(atomic_read(&bo->cpu_writers));
 146         BUG_ON(bo->mem.mm_node != NULL);
 147         BUG_ON(!list_empty(&bo->lru));
 148         BUG_ON(!list_empty(&bo->ddestroy));
 149         ttm_tt_destroy(bo->ttm);
 150         atomic_dec(&bo->glob->bo_count);
 151         fence_put(bo->moving);
 152         if (bo->resv == &bo->ttm_resv)
 153                 reservation_object_fini(&bo->ttm_resv);
 154         mutex_destroy(&bo->wu_mutex);
 155         if (bo->destroy)
 156                 bo->destroy(bo);
 157         else {
 158                 kfree(bo);
 159         }
 160         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 161 }
 162
 163 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 164 {
 165         struct ttm_bo_device *bdev = bo->bdev;
 166
 167         lockdep_assert_held(&bo->resv->lock.base);
 168
 169         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 170
 171                 BUG_ON(!list_empty(&bo->lru));
 172
 173                 list_add(&bo->lru, bdev->driver->lru_tail(bo));
 174                 kref_get(&bo->list_kref);
 175
 176                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 177                         list_add(&bo->swap, bdev->driver->swap_lru_tail(bo));
 178                         kref_get(&bo->list_kref);
 179                 }
 180         }
 181 }
 182 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 183
 184 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 185 {
 186         struct ttm_bo_device *bdev = bo->bdev;
 187         int put_count = 0;
 188
 189         if (bdev->driver->lru_removal)
 190                 bdev->driver->lru_removal(bo);
 191
 192         if (!list_empty(&bo->swap)) {
 193                 list_del_init(&bo->swap);
 194                 ++put_count;
 195         }
 196         if (!list_empty(&bo->lru)) {
 197                 list_del_init(&bo->lru);
 198                 ++put_count;
 199         }
 200
 201         return put_count;
 202 }
 203
 204 static void ttm_bo_ref_bug(struct kref *list_kref)
 205 {
 206         BUG();
 207 }
 208
 209 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 210                          bool never_free)
 211 {
 212         kref_sub(&bo->list_kref, count,
 213                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 214 }
 215
 216 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 217 {
 218         int put_count;
 219
 220         spin_lock(&bo->glob->lru_lock);
 221         put_count = ttm_bo_del_from_lru(bo);
 222         spin_unlock(&bo->glob->lru_lock);
 223         ttm_bo_list_ref_sub(bo, put_count, true);
 224 }
 225 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 226
 227 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 228 {
 229         struct ttm_bo_device *bdev = bo->bdev;
 230         int put_count = 0;
 231
 232         lockdep_assert_held(&bo->resv->lock.base);
 233
 234         if (bdev->driver->lru_removal)
 235                 bdev->driver->lru_removal(bo);
 236
 237         put_count = ttm_bo_del_from_lru(bo);
 238         ttm_bo_list_ref_sub(bo, put_count, true);
 239         ttm_bo_add_to_lru(bo);
 240 }
 241 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 242
 243 struct list_head *ttm_bo_default_lru_tail(struct ttm_buffer_object *bo)
 244 {
 245         return bo->bdev->man[bo->mem.mem_type].lru.prev;
 246 }
 247 EXPORT_SYMBOL(ttm_bo_default_lru_tail);
 248
 249 struct list_head *ttm_bo_default_swap_lru_tail(struct ttm_buffer_object *bo)
 250 {
 251         return bo->glob->swap_lru.prev;
 252 }
 253 EXPORT_SYMBOL(ttm_bo_default_swap_lru_tail);
 254
 255 /*
 256  * Call bo->mutex locked.
 257  */
 258 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 259 {
 260         struct ttm_bo_device *bdev = bo->bdev;
 261         struct ttm_bo_global *glob = bo->glob;
 262         int ret = 0;
 263         uint32_t page_flags = 0;
 264
 265         TTM_ASSERT_LOCKED(&bo->mutex);
 266         bo->ttm = NULL;
 267
 268         if (bdev->need_dma32)
 269                 page_flags |= TTM_PAGE_FLAG_DMA32;
 270
 271         switch (bo->type) {
 272         case ttm_bo_type_device:
 273                 if (zero_alloc)
 274                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 275         case ttm_bo_type_kernel:
 276                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 277                                                       page_flags, glob->dummy_read_page);
 278                 if (unlikely(bo->ttm == NULL))
 279                         ret = -ENOMEM;
 280                 break;
 281         case ttm_bo_type_sg:
 282                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 283                                                       page_flags | TTM_PAGE_FLAG_SG,
 284                                                       glob->dummy_read_page);
 285                 if (unlikely(bo->ttm == NULL)) {
 286                         ret = -ENOMEM;
 287                         break;
 288                 }
 289                 bo->ttm->sg = bo->sg;
 290                 break;
 291         default:
 292                 pr_err("Illegal buffer object type\n");
 293                 ret = -EINVAL;
 294                 break;
 295         }
 296
 297         return ret;
 298 }
 299
 300 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 301                                   struct ttm_mem_reg *mem,
 302                                   bool evict, bool interruptible,
 303                                   bool no_wait_gpu)
 304 {
 305         struct ttm_bo_device *bdev = bo->bdev;
 306         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 307         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 308         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 309         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 310         int ret = 0;
 311
 312         if (old_is_pci || new_is_pci ||
 313             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 314                 ret = ttm_mem_io_lock(old_man, true);
 315                 if (unlikely(ret != 0))
 316                         goto out_err;
 317                 ttm_bo_unmap_virtual_locked(bo);
 318                 ttm_mem_io_unlock(old_man);
 319         }
 320
 321         /*
 322          * Create and bind a ttm if required.
 323          */
 324
 325         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 326                 if (bo->ttm == NULL) {
 327                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 328                         ret = ttm_bo_add_ttm(bo, zero);
 329                         if (ret)
 330                                 goto out_err;
 331                 }
 332
 333                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 334                 if (ret)
 335                         goto out_err;
 336
 337                 if (mem->mem_type != TTM_PL_SYSTEM) {
 338                         ret = ttm_tt_bind(bo->ttm, mem);
 339                         if (ret)
 340                                 goto out_err;
 341                 }
 342
 343                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 344                         if (bdev->driver->move_notify)
 345                                 bdev->driver->move_notify(bo, mem);
 346                         bo->mem = *mem;
 347                         mem->mm_node = NULL;
 348                         goto moved;
 349                 }
 350         }
 351
 352         if (bdev->driver->move_notify)
 353                 bdev->driver->move_notify(bo, mem);
 354
 355         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 356             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 357                 ret = ttm_bo_move_ttm(bo, evict, interruptible, no_wait_gpu,
 358                                       mem);
 359         else if (bdev->driver->move)
 360                 ret = bdev->driver->move(bo, evict, interruptible,
 361                                          no_wait_gpu, mem);
 362         else
 363                 ret = ttm_bo_move_memcpy(bo, evict, interruptible,
 364                                          no_wait_gpu, mem);
 365
 366         if (ret) {
 367                 if (bdev->driver->move_notify) {
 368                         struct ttm_mem_reg tmp_mem = *mem;
 369                         *mem = bo->mem;
 370                         bo->mem = tmp_mem;
 371                         bdev->driver->move_notify(bo, mem);
 372                         bo->mem = *mem;
 373                         *mem = tmp_mem;
 374                 }
 375
 376                 goto out_err;
 377         }
 378
 379 moved:
 380         if (bo->evicted) {
 381                 if (bdev->driver->invalidate_caches) {
 382                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 383                         if (ret)
 384                                 pr_err("Can not flush read caches\n");
 385                 }
 386                 bo->evicted = false;
 387         }
 388
 389         if (bo->mem.mm_node) {
 390                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 391                     bdev->man[bo->mem.mem_type].gpu_offset;
 392                 bo->cur_placement = bo->mem.placement;
 393         } else
 394                 bo->offset = 0;
 395
 396         return 0;
 397
 398 out_err:
 399         new_man = &bdev->man[bo->mem.mem_type];
 400         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 401                 ttm_tt_destroy(bo->ttm);
 402                 bo->ttm = NULL;
 403         }
 404
 405         return ret;
 406 }
 407
 408 /**
 409  * Call bo::reserved.
 410  * Will release GPU memory type usage on destruction.
 411  * This is the place to put in driver specific hooks to release
 412  * driver private resources.
 413  * Will release the bo::reserved lock.
 414  */
 415
 416 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 417 {
 418         if (bo->bdev->driver->move_notify)
 419                 bo->bdev->driver->move_notify(bo, NULL);
 420
 421         ttm_tt_destroy(bo->ttm);
 422         bo->ttm = NULL;
 423         ttm_bo_mem_put(bo, &bo->mem);
 424
 425         ww_mutex_unlock (&bo->resv->lock);
 426 }
 427
 428 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 429 {
 430         struct reservation_object_list *fobj;
 431         struct fence *fence;
 432         int i;
 433
 434         fobj = reservation_object_get_list(bo->resv);
 435         fence = reservation_object_get_excl(bo->resv);
 436         if (fence && !fence->ops->signaled)
 437                 fence_enable_sw_signaling(fence);
 438
 439         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 440                 fence = rcu_dereference_protected(fobj->shared[i],
 441                                         reservation_object_held(bo->resv));
 442
 443                 if (!fence->ops->signaled)
 444                         fence_enable_sw_signaling(fence);
 445         }
 446 }
 447
 448 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 449 {
 450         struct ttm_bo_device *bdev = bo->bdev;
 451         struct ttm_bo_global *glob = bo->glob;
 452         int put_count;
 453         int ret;
 454
 455         spin_lock(&glob->lru_lock);
 456         ret = __ttm_bo_reserve(bo, false, true, NULL);
 457
 458         if (!ret) {
 459                 if (!ttm_bo_wait(bo, false, true)) {
 460                         put_count = ttm_bo_del_from_lru(bo);
 461
 462                         spin_unlock(&glob->lru_lock);
 463                         ttm_bo_cleanup_memtype_use(bo);
 464
 465                         ttm_bo_list_ref_sub(bo, put_count, true);
 466
 467                         return;
 468                 } else
 469                         ttm_bo_flush_all_fences(bo);
 470
 471                 /*
 472                  * Make NO_EVICT bos immediately available to
 473                  * shrinkers, now that they are queued for
 474                  * destruction.
 475                  */
 476                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 477                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 478                         ttm_bo_add_to_lru(bo);
 479                 }
 480
 481                 __ttm_bo_unreserve(bo);
 482         }
 483
 484         kref_get(&bo->list_kref);
 485         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 486         spin_unlock(&glob->lru_lock);
 487
 488         schedule_delayed_work(&bdev->wq,
 489                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 490 }
 491
 492 /**
 493  * function ttm_bo_cleanup_refs_and_unlock
 494  * If bo idle, remove from delayed- and lru lists, and unref.
 495  * If not idle, do nothing.
 496  *
 497  * Must be called with lru_lock and reservation held, this function
 498  * will drop both before returning.
 499  *
 500  * @interruptible         Any sleeps should occur interruptibly.
 501  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 502  */
 503
 504 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 505                                           bool interruptible,
 506                                           bool no_wait_gpu)
 507 {
 508         struct ttm_bo_global *glob = bo->glob;
 509         int put_count;
 510         int ret;
 511
 512         ret = ttm_bo_wait(bo, false, true);
 513
 514         if (ret && !no_wait_gpu) {
 515                 long lret;
 516                 ww_mutex_unlock(&bo->resv->lock);
 517                 spin_unlock(&glob->lru_lock);
 518
 519                 lret = reservation_object_wait_timeout_rcu(bo->resv,
 520                                                            true,
 521                                                            interruptible,
 522                                                            30 * HZ);
 523
 524                 if (lret < 0)
 525                         return lret;
 526                 else if (lret == 0)
 527                         return -EBUSY;
 528
 529                 spin_lock(&glob->lru_lock);
 530                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 531
 532                 /*
 533                  * We raced, and lost, someone else holds the reservation now,
 534                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 535                  *
 536                  * Even if it's not the case, because we finished waiting any
 537                  * delayed destruction would succeed, so just return success
 538                  * here.
 539                  */
 540                 if (ret) {
 541                         spin_unlock(&glob->lru_lock);
 542                         return 0;
 543                 }
 544
 545                 /*
 546                  * remove sync_obj with ttm_bo_wait, the wait should be
 547                  * finished, and no new wait object should have been added.
 548                  */
 549                 ret = ttm_bo_wait(bo, false, true);
 550                 WARN_ON(ret);
 551         }
 552
 553         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 554                 __ttm_bo_unreserve(bo);
 555                 spin_unlock(&glob->lru_lock);
 556                 return ret;
 557         }
 558
 559         put_count = ttm_bo_del_from_lru(bo);
 560         list_del_init(&bo->ddestroy);
 561         ++put_count;
 562
 563         spin_unlock(&glob->lru_lock);
 564         ttm_bo_cleanup_memtype_use(bo);
 565
 566         ttm_bo_list_ref_sub(bo, put_count, true);
 567
 568         return 0;
 569 }
 570
 571 /**
 572  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 573  * encountered buffers.
 574  */
 575
 576 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 577 {
 578         struct ttm_bo_global *glob = bdev->glob;
 579         struct ttm_buffer_object *entry = NULL;
 580         int ret = 0;
 581
 582         spin_lock(&glob->lru_lock);
 583         if (list_empty(&bdev->ddestroy))
 584                 goto out_unlock;
 585
 586         entry = list_first_entry(&bdev->ddestroy,
 587                 struct ttm_buffer_object, ddestroy);
 588         kref_get(&entry->list_kref);
 589
 590         for (;;) {
 591                 struct ttm_buffer_object *nentry = NULL;
 592
 593                 if (entry->ddestroy.next != &bdev->ddestroy) {
 594                         nentry = list_first_entry(&entry->ddestroy,
 595                                 struct ttm_buffer_object, ddestroy);
 596                         kref_get(&nentry->list_kref);
 597                 }
 598
 599                 ret = __ttm_bo_reserve(entry, false, true, NULL);
 600                 if (remove_all && ret) {
 601                         spin_unlock(&glob->lru_lock);
 602                         ret = __ttm_bo_reserve(entry, false, false, NULL);
 603                         spin_lock(&glob->lru_lock);
 604                 }
 605
 606                 if (!ret)
 607                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 608                                                              !remove_all);
 609                 else
 610                         spin_unlock(&glob->lru_lock);
 611
 612                 kref_put(&entry->list_kref, ttm_bo_release_list);
 613                 entry = nentry;
 614
 615                 if (ret || !entry)
 616                         goto out;
 617
 618                 spin_lock(&glob->lru_lock);
 619                 if (list_empty(&entry->ddestroy))
 620                         break;
 621         }
 622
 623 out_unlock:
 624         spin_unlock(&glob->lru_lock);
 625 out:
 626         if (entry)
 627                 kref_put(&entry->list_kref, ttm_bo_release_list);
 628         return ret;
 629 }
 630
 631 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 632 {
 633         struct ttm_bo_device *bdev =
 634             container_of(work, struct ttm_bo_device, wq.work);
 635
 636         if (ttm_bo_delayed_delete(bdev, false)) {
 637                 schedule_delayed_work(&bdev->wq,
 638                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 639         }
 640 }
 641
 642 static void ttm_bo_release(struct kref *kref)
 643 {
 644         struct ttm_buffer_object *bo =
 645             container_of(kref, struct ttm_buffer_object, kref);
 646         struct ttm_bo_device *bdev = bo->bdev;
 647         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 648
 649         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 650         ttm_mem_io_lock(man, false);
 651         ttm_mem_io_free_vm(bo);
 652         ttm_mem_io_unlock(man);
 653         ttm_bo_cleanup_refs_or_queue(bo);
 654         kref_put(&bo->list_kref, ttm_bo_release_list);
 655 }
 656
 657 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 658 {
 659         struct ttm_buffer_object *bo = *p_bo;
 660
 661         *p_bo = NULL;
 662         kref_put(&bo->kref, ttm_bo_release);
 663 }
 664 EXPORT_SYMBOL(ttm_bo_unref);
 665
 666 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 667 {
 668         return cancel_delayed_work_sync(&bdev->wq);
 669 }
 670 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 671
 672 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 673 {
 674         if (resched)
 675                 schedule_delayed_work(&bdev->wq,
 676                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 677 }
 678 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 679
 680 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 681                         bool no_wait_gpu)
 682 {
 683         struct ttm_bo_device *bdev = bo->bdev;
 684         struct ttm_mem_reg evict_mem;
 685         struct ttm_placement placement;
 686         int ret = 0;
 687
 688         lockdep_assert_held(&bo->resv->lock.base);
 689
 690         evict_mem = bo->mem;
 691         evict_mem.mm_node = NULL;
 692         evict_mem.bus.io_reserved_vm = false;
 693         evict_mem.bus.io_reserved_count = 0;
 694
 695         placement.num_placement = 0;
 696         placement.num_busy_placement = 0;
 697         bdev->driver->evict_flags(bo, &placement);
 698         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 699                                 no_wait_gpu);
 700         if (ret) {
 701                 if (ret != -ERESTARTSYS) {
 702                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 703                                bo);
 704                         ttm_bo_mem_space_debug(bo, &placement);
 705                 }
 706                 goto out;
 707         }
 708
 709         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 710                                      no_wait_gpu);
 711         if (unlikely(ret)) {
 712                 if (ret != -ERESTARTSYS)
 713                         pr_err("Buffer eviction failed\n");
 714                 ttm_bo_mem_put(bo, &evict_mem);
 715                 goto out;
 716         }
 717         bo->evicted = true;
 718 out:
 719         return ret;
 720 }
 721
 722 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 723                                 uint32_t mem_type,
 724                                 const struct ttm_place *place,
 725                                 bool interruptible,
 726                                 bool no_wait_gpu)
 727 {
 728         struct ttm_bo_global *glob = bdev->glob;
 729         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 730         struct ttm_buffer_object *bo;
 731         int ret = -EBUSY, put_count;
 732
 733         spin_lock(&glob->lru_lock);
 734         list_for_each_entry(bo, &man->lru, lru) {
 735                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 736                 if (!ret) {
 737                         if (place && (place->fpfn || place->lpfn)) {
 738                                 /* Don't evict this BO if it's outside of the
 739                                  * requested placement range
 740                                  */
 741                                 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 742                                     (place->lpfn && place->lpfn <= bo->mem.start)) {
 743                                         __ttm_bo_unreserve(bo);
 744                                         ret = -EBUSY;
 745                                         continue;
 746                                 }
 747                         }
 748
 749                         break;
 750                 }
 751         }
 752
 753         if (ret) {
 754                 spin_unlock(&glob->lru_lock);
 755                 return ret;
 756         }
 757
 758         kref_get(&bo->list_kref);
 759
 760         if (!list_empty(&bo->ddestroy)) {
 761                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 762                                                      no_wait_gpu);
 763                 kref_put(&bo->list_kref, ttm_bo_release_list);
 764                 return ret;
 765         }
 766
 767         put_count = ttm_bo_del_from_lru(bo);
 768         spin_unlock(&glob->lru_lock);
 769
 770         BUG_ON(ret != 0);
 771
 772         ttm_bo_list_ref_sub(bo, put_count, true);
 773
 774         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 775         ttm_bo_unreserve(bo);
 776
 777         kref_put(&bo->list_kref, ttm_bo_release_list);
 778         return ret;
 779 }
 780
 781 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 782 {
 783         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 784
 785         if (mem->mm_node)
 786                 (*man->func->put_node)(man, mem);
 787 }
 788 EXPORT_SYMBOL(ttm_bo_mem_put);
 789
 790 /**
 791  * Add the last move fence to the BO and reserve a new shared slot.
 792  */
 793 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 794                                  struct ttm_mem_type_manager *man,
 795                                  struct ttm_mem_reg *mem)
 796 {
 797         struct fence *fence;
 798         int ret;
 799
 800         spin_lock(&man->move_lock);
 801         fence = fence_get(man->move);
 802         spin_unlock(&man->move_lock);
 803
 804         if (fence) {
 805                 reservation_object_add_shared_fence(bo->resv, fence);
 806
 807                 ret = reservation_object_reserve_shared(bo->resv);
 808                 if (unlikely(ret))
 809                         return ret;
 810
 811                 fence_put(bo->moving);
 812                 bo->moving = fence;
 813         }
 814
 815         return 0;
 816 }
 817
 818 /**
 819  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 820  * space, or we've evicted everything and there isn't enough space.
 821  */
 822 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 823                                         uint32_t mem_type,
 824                                         const struct ttm_place *place,
 825                                         struct ttm_mem_reg *mem,
 826                                         bool interruptible,
 827                                         bool no_wait_gpu)
 828 {
 829         struct ttm_bo_device *bdev = bo->bdev;
 830         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 831         int ret;
 832
 833         do {
 834                 ret = (*man->func->get_node)(man, bo, place, mem);
 835                 if (unlikely(ret != 0))
 836                         return ret;
 837                 if (mem->mm_node)
 838                         break;
 839                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 840                                           interruptible, no_wait_gpu);
 841                 if (unlikely(ret != 0))
 842                         return ret;
 843         } while (1);
 844         mem->mem_type = mem_type;
 845         return ttm_bo_add_move_fence(bo, man, mem);
 846 }
 847
 848 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 849                                       uint32_t cur_placement,
 850                                       uint32_t proposed_placement)
 851 {
 852         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 853         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 854
 855         /**
 856          * Keep current caching if possible.
 857          */
 858
 859         if ((cur_placement & caching) != 0)
 860                 result |= (cur_placement & caching);
 861         else if ((man->default_caching & caching) != 0)
 862                 result |= man->default_caching;
 863         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 864                 result |= TTM_PL_FLAG_CACHED;
 865         else if ((TTM_PL_FLAG_WC & caching) != 0)
 866                 result |= TTM_PL_FLAG_WC;
 867         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 868                 result |= TTM_PL_FLAG_UNCACHED;
 869
 870         return result;
 871 }
 872
 873 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 874                                  uint32_t mem_type,
 875                                  const struct ttm_place *place,
 876                                  uint32_t *masked_placement)
 877 {
 878         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 879
 880         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 881                 return false;
 882
 883         if ((place->flags & man->available_caching) == 0)
 884                 return false;
 885
 886         cur_flags |= (place->flags & man->available_caching);
 887
 888         *masked_placement = cur_flags;
 889         return true;
 890 }
 891
 892 /**
 893  * Creates space for memory region @mem according to its type.
 894  *
 895  * This function first searches for free space in compatible memory types in
 896  * the priority order defined by the driver.  If free space isn't found, then
 897  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 898  * space.
 899  */
 900 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 901                         struct ttm_placement *placement,
 902                         struct ttm_mem_reg *mem,
 903                         bool interruptible,
 904                         bool no_wait_gpu)
 905 {
 906         struct ttm_bo_device *bdev = bo->bdev;
 907         struct ttm_mem_type_manager *man;
 908         uint32_t mem_type = TTM_PL_SYSTEM;
 909         uint32_t cur_flags = 0;
 910         bool type_found = false;
 911         bool type_ok = false;
 912         bool has_erestartsys = false;
 913         int i, ret;
 914
 915         ret = reservation_object_reserve_shared(bo->resv);
 916         if (unlikely(ret))
 917                 return ret;
 918
 919         mem->mm_node = NULL;
 920         for (i = 0; i < placement->num_placement; ++i) {
 921                 const struct ttm_place *place = &placement->placement[i];
 922
 923                 ret = ttm_mem_type_from_place(place, &mem_type);
 924                 if (ret)
 925                         return ret;
 926                 man = &bdev->man[mem_type];
 927                 if (!man->has_type || !man->use_type)
 928                         continue;
 929
 930                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 931                                                 &cur_flags);
 932
 933                 if (!type_ok)
 934                         continue;
 935
 936                 type_found = true;
 937                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 938                                                   cur_flags);
 939                 /*
 940                  * Use the access and other non-mapping-related flag bits from
 941                  * the memory placement flags to the current flags
 942                  */
 943                 ttm_flag_masked(&cur_flags, place->flags,
 944                                 ~TTM_PL_MASK_MEMTYPE);
 945
 946                 if (mem_type == TTM_PL_SYSTEM)
 947                         break;
 948
 949                 ret = (*man->func->get_node)(man, bo, place, mem);
 950                 if (unlikely(ret))
 951                         return ret;
 952
 953                 if (mem->mm_node) {
 954                         ret = ttm_bo_add_move_fence(bo, man, mem);
 955                         if (unlikely(ret)) {
 956                                 (*man->func->put_node)(man, mem);
 957                                 return ret;
 958                         }
 959                         break;
 960                 }
 961         }
 962
 963         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 964                 mem->mem_type = mem_type;
 965                 mem->placement = cur_flags;
 966                 return 0;
 967         }
 968
 969         for (i = 0; i < placement->num_busy_placement; ++i) {
 970                 const struct ttm_place *place = &placement->busy_placement[i];
 971
 972                 ret = ttm_mem_type_from_place(place, &mem_type);
 973                 if (ret)
 974                         return ret;
 975                 man = &bdev->man[mem_type];
 976                 if (!man->has_type || !man->use_type)
 977                         continue;
 978                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 979                         continue;
 980
 981                 type_found = true;
 982                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 983                                                   cur_flags);
 984                 /*
 985                  * Use the access and other non-mapping-related flag bits from
 986                  * the memory placement flags to the current flags
 987                  */
 988                 ttm_flag_masked(&cur_flags, place->flags,
 989                                 ~TTM_PL_MASK_MEMTYPE);
 990
 991                 if (mem_type == TTM_PL_SYSTEM) {
 992                         mem->mem_type = mem_type;
 993                         mem->placement = cur_flags;
 994                         mem->mm_node = NULL;
 995                         return 0;
 996                 }
 997
 998                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
 999                                                 interruptible, no_wait_gpu);
1000                 if (ret == 0 && mem->mm_node) {
1001                         mem->placement = cur_flags;
1002                         return 0;
1003                 }
1004                 if (ret == -ERESTARTSYS)
1005                         has_erestartsys = true;
1006         }
1007
1008         if (!type_found) {
1009                 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
1010                 return -EINVAL;
1011         }
1012
1013         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1014 }
1015 EXPORT_SYMBOL(ttm_bo_mem_space);
1016
1017 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1018                         struct ttm_placement *placement,
1019                         bool interruptible,
1020                         bool no_wait_gpu)
1021 {
1022         int ret = 0;
1023         struct ttm_mem_reg mem;
1024
1025         lockdep_assert_held(&bo->resv->lock.base);
1026
1027         mem.num_pages = bo->num_pages;
1028         mem.size = mem.num_pages << PAGE_SHIFT;
1029         mem.page_alignment = bo->mem.page_alignment;
1030         mem.bus.io_reserved_vm = false;
1031         mem.bus.io_reserved_count = 0;
1032         /*
1033          * Determine where to move the buffer.
1034          */
1035         ret = ttm_bo_mem_space(bo, placement, &mem,
1036                                interruptible, no_wait_gpu);
1037         if (ret)
1038                 goto out_unlock;
1039         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1040                                      interruptible, no_wait_gpu);
1041 out_unlock:
1042         if (ret && mem.mm_node)
1043                 ttm_bo_mem_put(bo, &mem);
1044         return ret;
1045 }
1046
1047 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1048                        struct ttm_mem_reg *mem,
1049                        uint32_t *new_flags)
1050 {
1051         int i;
1052
1053         for (i = 0; i < placement->num_placement; i++) {
1054                 const struct ttm_place *heap = &placement->placement[i];
1055                 if (mem->mm_node &&
1056                     (mem->start < heap->fpfn ||
1057                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1058                         continue;
1059
1060                 *new_flags = heap->flags;
1061                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1062                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1063                         return true;
1064         }
1065
1066         for (i = 0; i < placement->num_busy_placement; i++) {
1067                 const struct ttm_place *heap = &placement->busy_placement[i];
1068                 if (mem->mm_node &&
1069                     (mem->start < heap->fpfn ||
1070                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1071                         continue;
1072
1073                 *new_flags = heap->flags;
1074                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1075                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1076                         return true;
1077         }
1078
1079         return false;
1080 }
1081 EXPORT_SYMBOL(ttm_bo_mem_compat);
1082
1083 int ttm_bo_validate(struct ttm_buffer_object *bo,
1084                         struct ttm_placement *placement,
1085                         bool interruptible,
1086                         bool no_wait_gpu)
1087 {
1088         int ret;
1089         uint32_t new_flags;
1090
1091         lockdep_assert_held(&bo->resv->lock.base);
1092         /*
1093          * Check whether we need to move buffer.
1094          */
1095         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1096                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1097                                          no_wait_gpu);
1098                 if (ret)
1099                         return ret;
1100         } else {
1101                 /*
1102                  * Use the access and other non-mapping-related flag bits from
1103                  * the compatible memory placement flags to the active flags
1104                  */
1105                 ttm_flag_masked(&bo->mem.placement, new_flags,
1106                                 ~TTM_PL_MASK_MEMTYPE);
1107         }
1108         /*
1109          * We might need to add a TTM.
1110          */
1111         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1112                 ret = ttm_bo_add_ttm(bo, true);
1113                 if (ret)
1114                         return ret;
1115         }
1116         return 0;
1117 }
1118 EXPORT_SYMBOL(ttm_bo_validate);
1119
1120 int ttm_bo_init(struct ttm_bo_device *bdev,
1121                 struct ttm_buffer_object *bo,
1122                 unsigned long size,
1123                 enum ttm_bo_type type,
1124                 struct ttm_placement *placement,
1125                 uint32_t page_alignment,
1126                 bool interruptible,
1127                 struct file *persistent_swap_storage,
1128                 size_t acc_size,
1129                 struct sg_table *sg,
1130                 struct reservation_object *resv,
1131                 void (*destroy) (struct ttm_buffer_object *))
1132 {
1133         int ret = 0;
1134         unsigned long num_pages;
1135         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1136         bool locked;
1137
1138         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1139         if (ret) {
1140                 pr_err("Out of kernel memory\n");
1141                 if (destroy)
1142                         (*destroy)(bo);
1143                 else
1144                         kfree(bo);
1145                 return -ENOMEM;
1146         }
1147
1148         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1149         if (num_pages == 0) {
1150                 pr_err("Illegal buffer object size\n");
1151                 if (destroy)
1152                         (*destroy)(bo);
1153                 else
1154                         kfree(bo);
1155                 ttm_mem_global_free(mem_glob, acc_size);
1156                 return -EINVAL;
1157         }
1158         bo->destroy = destroy;
1159
1160         kref_init(&bo->kref);
1161         kref_init(&bo->list_kref);
1162         atomic_set(&bo->cpu_writers, 0);
1163         INIT_LIST_HEAD(&bo->lru);
1164         INIT_LIST_HEAD(&bo->ddestroy);
1165         INIT_LIST_HEAD(&bo->swap);
1166         INIT_LIST_HEAD(&bo->io_reserve_lru);
1167         mutex_init(&bo->wu_mutex);
1168         bo->bdev = bdev;
1169         bo->glob = bdev->glob;
1170         bo->type = type;
1171         bo->num_pages = num_pages;
1172         bo->mem.size = num_pages << PAGE_SHIFT;
1173         bo->mem.mem_type = TTM_PL_SYSTEM;
1174         bo->mem.num_pages = bo->num_pages;
1175         bo->mem.mm_node = NULL;
1176         bo->mem.page_alignment = page_alignment;
1177         bo->mem.bus.io_reserved_vm = false;
1178         bo->mem.bus.io_reserved_count = 0;
1179         bo->moving = NULL;
1180         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1181         bo->persistent_swap_storage = persistent_swap_storage;
1182         bo->acc_size = acc_size;
1183         bo->sg = sg;
1184         if (resv) {
1185                 bo->resv = resv;
1186                 lockdep_assert_held(&bo->resv->lock.base);
1187         } else {
1188                 bo->resv = &bo->ttm_resv;
1189                 reservation_object_init(&bo->ttm_resv);
1190         }
1191         atomic_inc(&bo->glob->bo_count);
1192         drm_vma_node_reset(&bo->vma_node);
1193
1194         /*
1195          * For ttm_bo_type_device buffers, allocate
1196          * address space from the device.
1197          */
1198         if (bo->type == ttm_bo_type_device ||
1199             bo->type == ttm_bo_type_sg)
1200                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1201                                          bo->mem.num_pages);
1202
1203         /* passed reservation objects should already be locked,
1204          * since otherwise lockdep will be angered in radeon.
1205          */
1206         if (!resv) {
1207                 locked = ww_mutex_trylock(&bo->resv->lock);
1208                 WARN_ON(!locked);
1209         }
1210
1211         if (likely(!ret))
1212                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1213
1214         if (!resv) {
1215                 ttm_bo_unreserve(bo);
1216
1217         } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1218                 spin_lock(&bo->glob->lru_lock);
1219                 ttm_bo_add_to_lru(bo);
1220                 spin_unlock(&bo->glob->lru_lock);
1221         }
1222
1223         if (unlikely(ret))
1224                 ttm_bo_unref(&bo);
1225
1226         return ret;
1227 }
1228 EXPORT_SYMBOL(ttm_bo_init);
1229
1230 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1231                        unsigned long bo_size,
1232                        unsigned struct_size)
1233 {
1234         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1235         size_t size = 0;
1236
1237         size += ttm_round_pot(struct_size);
1238         size += ttm_round_pot(npages * sizeof(void *));
1239         size += ttm_round_pot(sizeof(struct ttm_tt));
1240         return size;
1241 }
1242 EXPORT_SYMBOL(ttm_bo_acc_size);
1243
1244 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1245                            unsigned long bo_size,
1246                            unsigned struct_size)
1247 {
1248         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1249         size_t size = 0;
1250
1251         size += ttm_round_pot(struct_size);
1252         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1253         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1254         return size;
1255 }
1256 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1257
1258 int ttm_bo_create(struct ttm_bo_device *bdev,
1259                         unsigned long size,
1260                         enum ttm_bo_type type,
1261                         struct ttm_placement *placement,
1262                         uint32_t page_alignment,
1263                         bool interruptible,
1264                         struct file *persistent_swap_storage,
1265                         struct ttm_buffer_object **p_bo)
1266 {
1267         struct ttm_buffer_object *bo;
1268         size_t acc_size;
1269         int ret;
1270
1271         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1272         if (unlikely(bo == NULL))
1273                 return -ENOMEM;
1274
1275         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1276         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1277                           interruptible, persistent_swap_storage, acc_size,
1278                           NULL, NULL, NULL);
1279         if (likely(ret == 0))
1280                 *p_bo = bo;
1281
1282         return ret;
1283 }
1284 EXPORT_SYMBOL(ttm_bo_create);
1285
1286 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1287                                         unsigned mem_type, bool allow_errors)
1288 {
1289         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1290         struct ttm_bo_global *glob = bdev->glob;
1291         struct fence *fence;
1292         int ret;
1293
1294         /*
1295          * Can't use standard list traversal since we're unlocking.
1296          */
1297
1298         spin_lock(&glob->lru_lock);
1299         while (!list_empty(&man->lru)) {
1300                 spin_unlock(&glob->lru_lock);
1301                 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1302                 if (ret) {
1303                         if (allow_errors) {
1304                                 return ret;
1305                         } else {
1306                                 pr_err("Cleanup eviction failed\n");
1307                         }
1308                 }
1309                 spin_lock(&glob->lru_lock);
1310         }
1311         spin_unlock(&glob->lru_lock);
1312
1313         spin_lock(&man->move_lock);
1314         fence = fence_get(man->move);
1315         spin_unlock(&man->move_lock);
1316
1317         if (fence) {
1318                 ret = fence_wait(fence, false);
1319                 fence_put(fence);
1320                 if (ret) {
1321                         if (allow_errors) {
1322                                 return ret;
1323                         } else {
1324                                 pr_err("Cleanup eviction failed\n");
1325                         }
1326                 }
1327         }
1328
1329         return 0;
1330 }
1331
1332 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1333 {
1334         struct ttm_mem_type_manager *man;
1335         int ret = -EINVAL;
1336
1337         if (mem_type >= TTM_NUM_MEM_TYPES) {
1338                 pr_err("Illegal memory type %d\n", mem_type);
1339                 return ret;
1340         }
1341         man = &bdev->man[mem_type];
1342
1343         if (!man->has_type) {
1344                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1345                        mem_type);
1346                 return ret;
1347         }
1348         fence_put(man->move);
1349
1350         man->use_type = false;
1351         man->has_type = false;
1352
1353         ret = 0;
1354         if (mem_type > 0) {
1355                 ttm_bo_force_list_clean(bdev, mem_type, false);
1356
1357                 ret = (*man->func->takedown)(man);
1358         }
1359
1360         return ret;
1361 }
1362 EXPORT_SYMBOL(ttm_bo_clean_mm);
1363
1364 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1365 {
1366         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1367
1368         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1369                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1370                 return -EINVAL;
1371         }
1372
1373         if (!man->has_type) {
1374                 pr_err("Memory type %u has not been initialized\n", mem_type);
1375                 return 0;
1376         }
1377
1378         return ttm_bo_force_list_clean(bdev, mem_type, true);
1379 }
1380 EXPORT_SYMBOL(ttm_bo_evict_mm);
1381
1382 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1383                         unsigned long p_size)
1384 {
1385         int ret = -EINVAL;
1386         struct ttm_mem_type_manager *man;
1387
1388         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1389         man = &bdev->man[type];
1390         BUG_ON(man->has_type);
1391         man->io_reserve_fastpath = true;
1392         man->use_io_reserve_lru = false;
1393         mutex_init(&man->io_reserve_mutex);
1394         spin_lock_init(&man->move_lock);
1395         INIT_LIST_HEAD(&man->io_reserve_lru);
1396
1397         ret = bdev->driver->init_mem_type(bdev, type, man);
1398         if (ret)
1399                 return ret;
1400         man->bdev = bdev;
1401
1402         ret = 0;
1403         if (type != TTM_PL_SYSTEM) {
1404                 ret = (*man->func->init)(man, p_size);
1405                 if (ret)
1406                         return ret;
1407         }
1408         man->has_type = true;
1409         man->use_type = true;
1410         man->size = p_size;
1411
1412         INIT_LIST_HEAD(&man->lru);
1413         man->move = NULL;
1414
1415         return 0;
1416 }
1417 EXPORT_SYMBOL(ttm_bo_init_mm);
1418
1419 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1420 {
1421         struct ttm_bo_global *glob =
1422                 container_of(kobj, struct ttm_bo_global, kobj);
1423
1424         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1425         __free_page(glob->dummy_read_page);
1426         kfree(glob);
1427 }
1428
1429 void ttm_bo_global_release(struct drm_global_reference *ref)
1430 {
1431         struct ttm_bo_global *glob = ref->object;
1432
1433         kobject_del(&glob->kobj);
1434         kobject_put(&glob->kobj);
1435 }
1436 EXPORT_SYMBOL(ttm_bo_global_release);
1437
1438 int ttm_bo_global_init(struct drm_global_reference *ref)
1439 {
1440         struct ttm_bo_global_ref *bo_ref =
1441                 container_of(ref, struct ttm_bo_global_ref, ref);
1442         struct ttm_bo_global *glob = ref->object;
1443         int ret;
1444
1445         mutex_init(&glob->device_list_mutex);
1446         spin_lock_init(&glob->lru_lock);
1447         glob->mem_glob = bo_ref->mem_glob;
1448         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1449
1450         if (unlikely(glob->dummy_read_page == NULL)) {
1451                 ret = -ENOMEM;
1452                 goto out_no_drp;
1453         }
1454
1455         INIT_LIST_HEAD(&glob->swap_lru);
1456         INIT_LIST_HEAD(&glob->device_list);
1457
1458         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1459         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1460         if (unlikely(ret != 0)) {
1461                 pr_err("Could not register buffer object swapout\n");
1462                 goto out_no_shrink;
1463         }
1464
1465         atomic_set(&glob->bo_count, 0);
1466
1467         ret = kobject_init_and_add(
1468                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1469         if (unlikely(ret != 0))
1470                 kobject_put(&glob->kobj);
1471         return ret;
1472 out_no_shrink:
1473         __free_page(glob->dummy_read_page);
1474 out_no_drp:
1475         kfree(glob);
1476         return ret;
1477 }
1478 EXPORT_SYMBOL(ttm_bo_global_init);
1479
1480
1481 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1482 {
1483         int ret = 0;
1484         unsigned i = TTM_NUM_MEM_TYPES;
1485         struct ttm_mem_type_manager *man;
1486         struct ttm_bo_global *glob = bdev->glob;
1487
1488         while (i--) {
1489                 man = &bdev->man[i];
1490                 if (man->has_type) {
1491                         man->use_type = false;
1492                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1493                                 ret = -EBUSY;
1494                                 pr_err("DRM memory manager type %d is not clean\n",
1495                                        i);
1496                         }
1497                         man->has_type = false;
1498                 }
1499         }
1500
1501         mutex_lock(&glob->device_list_mutex);
1502         list_del(&bdev->device_list);
1503         mutex_unlock(&glob->device_list_mutex);
1504
1505         cancel_delayed_work_sync(&bdev->wq);
1506
1507         while (ttm_bo_delayed_delete(bdev, true))
1508                 ;
1509
1510         spin_lock(&glob->lru_lock);
1511         if (list_empty(&bdev->ddestroy))
1512                 TTM_DEBUG("Delayed destroy list was clean\n");
1513
1514         if (list_empty(&bdev->man[0].lru))
1515                 TTM_DEBUG("Swap list was clean\n");
1516         spin_unlock(&glob->lru_lock);
1517
1518         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1519
1520         return ret;
1521 }
1522 EXPORT_SYMBOL(ttm_bo_device_release);
1523
1524 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1525                        struct ttm_bo_global *glob,
1526                        struct ttm_bo_driver *driver,
1527                        struct address_space *mapping,
1528                        uint64_t file_page_offset,
1529                        bool need_dma32)
1530 {
1531         int ret = -EINVAL;
1532
1533         bdev->driver = driver;
1534
1535         memset(bdev->man, 0, sizeof(bdev->man));
1536
1537         /*
1538          * Initialize the system memory buffer type.
1539          * Other types need to be driver / IOCTL initialized.
1540          */
1541         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1542         if (unlikely(ret != 0))
1543                 goto out_no_sys;
1544
1545         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1546                                     0x10000000);
1547         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1548         INIT_LIST_HEAD(&bdev->ddestroy);
1549         bdev->dev_mapping = mapping;
1550         bdev->glob = glob;
1551         bdev->need_dma32 = need_dma32;
1552         mutex_lock(&glob->device_list_mutex);
1553         list_add_tail(&bdev->device_list, &glob->device_list);
1554         mutex_unlock(&glob->device_list_mutex);
1555
1556         return 0;
1557 out_no_sys:
1558         return ret;
1559 }
1560 EXPORT_SYMBOL(ttm_bo_device_init);
1561
1562 /*
1563  * buffer object vm functions.
1564  */
1565
1566 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1567 {
1568         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1569
1570         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1571                 if (mem->mem_type == TTM_PL_SYSTEM)
1572                         return false;
1573
1574                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1575                         return false;
1576
1577                 if (mem->placement & TTM_PL_FLAG_CACHED)
1578                         return false;
1579         }
1580         return true;
1581 }
1582
1583 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1584 {
1585         struct ttm_bo_device *bdev = bo->bdev;
1586
1587         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1588         ttm_mem_io_free_vm(bo);
1589 }
1590
1591 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1592 {
1593         struct ttm_bo_device *bdev = bo->bdev;
1594         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1595
1596         ttm_mem_io_lock(man, false);
1597         ttm_bo_unmap_virtual_locked(bo);
1598         ttm_mem_io_unlock(man);
1599 }
1600
1601
1602 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1603
1604 int ttm_bo_wait(struct ttm_buffer_object *bo,
1605                 bool interruptible, bool no_wait)
1606 {
1607         long timeout = no_wait ? 0 : 15 * HZ;
1608
1609         timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1610                                                       interruptible, timeout);
1611         if (timeout < 0)
1612                 return timeout;
1613
1614         if (timeout == 0)
1615                 return -EBUSY;
1616
1617         reservation_object_add_excl_fence(bo->resv, NULL);
1618         return 0;
1619 }
1620 EXPORT_SYMBOL(ttm_bo_wait);
1621
1622 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1623 {
1624         int ret = 0;
1625
1626         /*
1627          * Using ttm_bo_reserve makes sure the lru lists are updated.
1628          */
1629
1630         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1631         if (unlikely(ret != 0))
1632                 return ret;
1633         ret = ttm_bo_wait(bo, true, no_wait);
1634         if (likely(ret == 0))
1635                 atomic_inc(&bo->cpu_writers);
1636         ttm_bo_unreserve(bo);
1637         return ret;
1638 }
1639 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1640
1641 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1642 {
1643         atomic_dec(&bo->cpu_writers);
1644 }
1645 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1646
1647 /**
1648  * A buffer object shrink method that tries to swap out the first
1649  * buffer object on the bo_global::swap_lru list.
1650  */
1651
1652 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1653 {
1654         struct ttm_bo_global *glob =
1655             container_of(shrink, struct ttm_bo_global, shrink);
1656         struct ttm_buffer_object *bo;
1657         int ret = -EBUSY;
1658         int put_count;
1659         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1660
1661         spin_lock(&glob->lru_lock);
1662         list_for_each_entry(bo, &glob->swap_lru, swap) {
1663                 ret = __ttm_bo_reserve(bo, false, true, NULL);
1664                 if (!ret)
1665                         break;
1666         }
1667
1668         if (ret) {
1669                 spin_unlock(&glob->lru_lock);
1670                 return ret;
1671         }
1672
1673         kref_get(&bo->list_kref);
1674
1675         if (!list_empty(&bo->ddestroy)) {
1676                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1677                 kref_put(&bo->list_kref, ttm_bo_release_list);
1678                 return ret;
1679         }
1680
1681         put_count = ttm_bo_del_from_lru(bo);
1682         spin_unlock(&glob->lru_lock);
1683
1684         ttm_bo_list_ref_sub(bo, put_count, true);
1685
1686         /**
1687          * Move to system cached
1688          */
1689
1690         if ((bo->mem.placement & swap_placement) != swap_placement) {
1691                 struct ttm_mem_reg evict_mem;
1692
1693                 evict_mem = bo->mem;
1694                 evict_mem.mm_node = NULL;
1695                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1696                 evict_mem.mem_type = TTM_PL_SYSTEM;
1697
1698                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1699                                              false, false);
1700                 if (unlikely(ret != 0))
1701                         goto out;
1702         }
1703
1704         /**
1705          * Make sure BO is idle.
1706          */
1707
1708         ret = ttm_bo_wait(bo, false, false);
1709         if (unlikely(ret != 0))
1710                 goto out;
1711
1712         ttm_bo_unmap_virtual(bo);
1713
1714         /**
1715          * Swap out. Buffer will be swapped in again as soon as
1716          * anyone tries to access a ttm page.
1717          */
1718
1719         if (bo->bdev->driver->swap_notify)
1720                 bo->bdev->driver->swap_notify(bo);
1721
1722         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1723 out:
1724
1725         /**
1726          *
1727          * Unreserve without putting on LRU to avoid swapping out an
1728          * already swapped buffer.
1729          */
1730
1731         __ttm_bo_unreserve(bo);
1732         kref_put(&bo->list_kref, ttm_bo_release_list);
1733         return ret;
1734 }
1735
1736 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1737 {
1738         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1739                 ;
1740 }
1741 EXPORT_SYMBOL(ttm_bo_swapout_all);
1742
1743 /**
1744  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1745  * unreserved
1746  *
1747  * @bo: Pointer to buffer
1748  */
1749 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1750 {
1751         int ret;
1752
1753         /*
1754          * In the absense of a wait_unlocked API,
1755          * Use the bo::wu_mutex to avoid triggering livelocks due to
1756          * concurrent use of this function. Note that this use of
1757          * bo::wu_mutex can go away if we change locking order to
1758          * mmap_sem -> bo::reserve.
1759          */
1760         ret = mutex_lock_interruptible(&bo->wu_mutex);
1761         if (unlikely(ret != 0))
1762                 return -ERESTARTSYS;
1763         if (!ww_mutex_is_locked(&bo->resv->lock))
1764                 goto out_unlock;
1765         ret = __ttm_bo_reserve(bo, true, false, NULL);
1766         if (unlikely(ret != 0))
1767                 goto out_unlock;
1768         __ttm_bo_unreserve(bo);
1769
1770 out_unlock:
1771         mutex_unlock(&bo->wu_mutex);
1772         return ret;
1773 }