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
 150         ttm_tt_destroy(bo->ttm);
 151         atomic_dec(&bo->glob->bo_count);
 152         fence_put(bo->moving);
 153         if (bo->resv == &bo->ttm_resv)
 154                 reservation_object_fini(&bo->ttm_resv);
 155         mutex_destroy(&bo->wu_mutex);
 156         if (bo->destroy)
 157                 bo->destroy(bo);
 158         else {
 159                 kfree(bo);
 160         }
 161         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 162 }
 163
 164 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 165 {
 166         struct ttm_bo_device *bdev = bo->bdev;
 167
 168         lockdep_assert_held(&bo->resv->lock.base);
 169
 170         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 171
 172                 BUG_ON(!list_empty(&bo->lru));
 173
 174                 list_add(&bo->lru, bdev->driver->lru_tail(bo));
 175                 kref_get(&bo->list_kref);
 176
 177                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 178                         list_add(&bo->swap, bdev->driver->swap_lru_tail(bo));
 179                         kref_get(&bo->list_kref);
 180                 }
 181         }
 182 }
 183 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 184
 185 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 186 {
 187         struct ttm_bo_device *bdev = bo->bdev;
 188         int put_count = 0;
 189
 190         if (bdev->driver->lru_removal)
 191                 bdev->driver->lru_removal(bo);
 192
 193         if (!list_empty(&bo->swap)) {
 194                 list_del_init(&bo->swap);
 195                 ++put_count;
 196         }
 197         if (!list_empty(&bo->lru)) {
 198                 list_del_init(&bo->lru);
 199                 ++put_count;
 200         }
 201
 202         return put_count;
 203 }
 204
 205 static void ttm_bo_ref_bug(struct kref *list_kref)
 206 {
 207         BUG();
 208 }
 209
 210 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 211                          bool never_free)
 212 {
 213         kref_sub(&bo->list_kref, count,
 214                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 215 }
 216
 217 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 218 {
 219         int put_count;
 220
 221         spin_lock(&bo->glob->lru_lock);
 222         put_count = ttm_bo_del_from_lru(bo);
 223         spin_unlock(&bo->glob->lru_lock);
 224         ttm_bo_list_ref_sub(bo, put_count, true);
 225 }
 226 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 227
 228 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 229 {
 230         struct ttm_bo_device *bdev = bo->bdev;
 231         int put_count = 0;
 232
 233         lockdep_assert_held(&bo->resv->lock.base);
 234
 235         if (bdev->driver->lru_removal)
 236                 bdev->driver->lru_removal(bo);
 237
 238         put_count = ttm_bo_del_from_lru(bo);
 239         ttm_bo_list_ref_sub(bo, put_count, true);
 240         ttm_bo_add_to_lru(bo);
 241 }
 242 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 243
 244 struct list_head *ttm_bo_default_lru_tail(struct ttm_buffer_object *bo)
 245 {
 246         return bo->bdev->man[bo->mem.mem_type].lru.prev;
 247 }
 248 EXPORT_SYMBOL(ttm_bo_default_lru_tail);
 249
 250 struct list_head *ttm_bo_default_swap_lru_tail(struct ttm_buffer_object *bo)
 251 {
 252         return bo->glob->swap_lru.prev;
 253 }
 254 EXPORT_SYMBOL(ttm_bo_default_swap_lru_tail);
 255
 256 /*
 257  * Call bo->mutex locked.
 258  */
 259 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 260 {
 261         struct ttm_bo_device *bdev = bo->bdev;
 262         struct ttm_bo_global *glob = bo->glob;
 263         int ret = 0;
 264         uint32_t page_flags = 0;
 265
 266         TTM_ASSERT_LOCKED(&bo->mutex);
 267         bo->ttm = NULL;
 268
 269         if (bdev->need_dma32)
 270                 page_flags |= TTM_PAGE_FLAG_DMA32;
 271
 272         switch (bo->type) {
 273         case ttm_bo_type_device:
 274                 if (zero_alloc)
 275                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 276         case ttm_bo_type_kernel:
 277                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 278                                                       page_flags, glob->dummy_read_page);
 279                 if (unlikely(bo->ttm == NULL))
 280                         ret = -ENOMEM;
 281                 break;
 282         case ttm_bo_type_sg:
 283                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 284                                                       page_flags | TTM_PAGE_FLAG_SG,
 285                                                       glob->dummy_read_page);
 286                 if (unlikely(bo->ttm == NULL)) {
 287                         ret = -ENOMEM;
 288                         break;
 289                 }
 290                 bo->ttm->sg = bo->sg;
 291                 break;
 292         default:
 293                 pr_err("Illegal buffer object type\n");
 294                 ret = -EINVAL;
 295                 break;
 296         }
 297
 298         return ret;
 299 }
 300
 301 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 302                                   struct ttm_mem_reg *mem,
 303                                   bool evict, bool interruptible,
 304                                   bool no_wait_gpu)
 305 {
 306         struct ttm_bo_device *bdev = bo->bdev;
 307         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 308         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 309         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 310         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 311         int ret = 0;
 312
 313         if (old_is_pci || new_is_pci ||
 314             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 315                 ret = ttm_mem_io_lock(old_man, true);
 316                 if (unlikely(ret != 0))
 317                         goto out_err;
 318                 ttm_bo_unmap_virtual_locked(bo);
 319                 ttm_mem_io_unlock(old_man);
 320         }
 321
 322         /*
 323          * Create and bind a ttm if required.
 324          */
 325
 326         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 327                 if (bo->ttm == NULL) {
 328                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 329                         ret = ttm_bo_add_ttm(bo, zero);
 330                         if (ret)
 331                                 goto out_err;
 332                 }
 333
 334                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 335                 if (ret)
 336                         goto out_err;
 337
 338                 if (mem->mem_type != TTM_PL_SYSTEM) {
 339                         ret = ttm_tt_bind(bo->ttm, mem);
 340                         if (ret)
 341                                 goto out_err;
 342                 }
 343
 344                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 345                         if (bdev->driver->move_notify)
 346                                 bdev->driver->move_notify(bo, mem);
 347                         bo->mem = *mem;
 348                         mem->mm_node = NULL;
 349                         goto moved;
 350                 }
 351         }
 352
 353         if (bdev->driver->move_notify)
 354                 bdev->driver->move_notify(bo, mem);
 355
 356         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 357             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 358                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, 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  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 792  * space, or we've evicted everything and there isn't enough space.
 793  */
 794 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 795                                         uint32_t mem_type,
 796                                         const struct ttm_place *place,
 797                                         struct ttm_mem_reg *mem,
 798                                         bool interruptible,
 799                                         bool no_wait_gpu)
 800 {
 801         struct ttm_bo_device *bdev = bo->bdev;
 802         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 803         int ret;
 804
 805         do {
 806                 ret = (*man->func->get_node)(man, bo, place, mem);
 807                 if (unlikely(ret != 0))
 808                         return ret;
 809                 if (mem->mm_node)
 810                         break;
 811                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 812                                           interruptible, no_wait_gpu);
 813                 if (unlikely(ret != 0))
 814                         return ret;
 815         } while (1);
 816         if (mem->mm_node == NULL)
 817                 return -ENOMEM;
 818         mem->mem_type = mem_type;
 819         return 0;
 820 }
 821
 822 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 823                                       uint32_t cur_placement,
 824                                       uint32_t proposed_placement)
 825 {
 826         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 827         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 828
 829         /**
 830          * Keep current caching if possible.
 831          */
 832
 833         if ((cur_placement & caching) != 0)
 834                 result |= (cur_placement & caching);
 835         else if ((man->default_caching & caching) != 0)
 836                 result |= man->default_caching;
 837         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 838                 result |= TTM_PL_FLAG_CACHED;
 839         else if ((TTM_PL_FLAG_WC & caching) != 0)
 840                 result |= TTM_PL_FLAG_WC;
 841         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 842                 result |= TTM_PL_FLAG_UNCACHED;
 843
 844         return result;
 845 }
 846
 847 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 848                                  uint32_t mem_type,
 849                                  const struct ttm_place *place,
 850                                  uint32_t *masked_placement)
 851 {
 852         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 853
 854         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 855                 return false;
 856
 857         if ((place->flags & man->available_caching) == 0)
 858                 return false;
 859
 860         cur_flags |= (place->flags & man->available_caching);
 861
 862         *masked_placement = cur_flags;
 863         return true;
 864 }
 865
 866 /**
 867  * Creates space for memory region @mem according to its type.
 868  *
 869  * This function first searches for free space in compatible memory types in
 870  * the priority order defined by the driver.  If free space isn't found, then
 871  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 872  * space.
 873  */
 874 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 875                         struct ttm_placement *placement,
 876                         struct ttm_mem_reg *mem,
 877                         bool interruptible,
 878                         bool no_wait_gpu)
 879 {
 880         struct ttm_bo_device *bdev = bo->bdev;
 881         struct ttm_mem_type_manager *man;
 882         uint32_t mem_type = TTM_PL_SYSTEM;
 883         uint32_t cur_flags = 0;
 884         bool type_found = false;
 885         bool type_ok = false;
 886         bool has_erestartsys = false;
 887         int i, ret;
 888
 889         mem->mm_node = NULL;
 890         for (i = 0; i < placement->num_placement; ++i) {
 891                 const struct ttm_place *place = &placement->placement[i];
 892
 893                 ret = ttm_mem_type_from_place(place, &mem_type);
 894                 if (ret)
 895                         return ret;
 896                 man = &bdev->man[mem_type];
 897                 if (!man->has_type || !man->use_type)
 898                         continue;
 899
 900                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 901                                                 &cur_flags);
 902
 903                 if (!type_ok)
 904                         continue;
 905
 906                 type_found = true;
 907                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 908                                                   cur_flags);
 909                 /*
 910                  * Use the access and other non-mapping-related flag bits from
 911                  * the memory placement flags to the current flags
 912                  */
 913                 ttm_flag_masked(&cur_flags, place->flags,
 914                                 ~TTM_PL_MASK_MEMTYPE);
 915
 916                 if (mem_type == TTM_PL_SYSTEM)
 917                         break;
 918
 919                 ret = (*man->func->get_node)(man, bo, place, mem);
 920                 if (unlikely(ret))
 921                         return ret;
 922
 923                 if (mem->mm_node)
 924                         break;
 925         }
 926
 927         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 928                 mem->mem_type = mem_type;
 929                 mem->placement = cur_flags;
 930                 return 0;
 931         }
 932
 933         for (i = 0; i < placement->num_busy_placement; ++i) {
 934                 const struct ttm_place *place = &placement->busy_placement[i];
 935
 936                 ret = ttm_mem_type_from_place(place, &mem_type);
 937                 if (ret)
 938                         return ret;
 939                 man = &bdev->man[mem_type];
 940                 if (!man->has_type || !man->use_type)
 941                         continue;
 942                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 943                         continue;
 944
 945                 type_found = true;
 946                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 947                                                   cur_flags);
 948                 /*
 949                  * Use the access and other non-mapping-related flag bits from
 950                  * the memory placement flags to the current flags
 951                  */
 952                 ttm_flag_masked(&cur_flags, place->flags,
 953                                 ~TTM_PL_MASK_MEMTYPE);
 954
 955                 if (mem_type == TTM_PL_SYSTEM) {
 956                         mem->mem_type = mem_type;
 957                         mem->placement = cur_flags;
 958                         mem->mm_node = NULL;
 959                         return 0;
 960                 }
 961
 962                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
 963                                                 interruptible, no_wait_gpu);
 964                 if (ret == 0 && mem->mm_node) {
 965                         mem->placement = cur_flags;
 966                         return 0;
 967                 }
 968                 if (ret == -ERESTARTSYS)
 969                         has_erestartsys = true;
 970         }
 971
 972         if (!type_found) {
 973                 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
 974                 return -EINVAL;
 975         }
 976
 977         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
 978 }
 979 EXPORT_SYMBOL(ttm_bo_mem_space);
 980
 981 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 982                         struct ttm_placement *placement,
 983                         bool interruptible,
 984                         bool no_wait_gpu)
 985 {
 986         int ret = 0;
 987         struct ttm_mem_reg mem;
 988
 989         lockdep_assert_held(&bo->resv->lock.base);
 990
 991         mem.num_pages = bo->num_pages;
 992         mem.size = mem.num_pages << PAGE_SHIFT;
 993         mem.page_alignment = bo->mem.page_alignment;
 994         mem.bus.io_reserved_vm = false;
 995         mem.bus.io_reserved_count = 0;
 996         /*
 997          * Determine where to move the buffer.
 998          */
 999         ret = ttm_bo_mem_space(bo, placement, &mem,
1000                                interruptible, no_wait_gpu);
1001         if (ret)
1002                 goto out_unlock;
1003         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1004                                      interruptible, no_wait_gpu);
1005 out_unlock:
1006         if (ret && mem.mm_node)
1007                 ttm_bo_mem_put(bo, &mem);
1008         return ret;
1009 }
1010
1011 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1012                               struct ttm_mem_reg *mem,
1013                               uint32_t *new_flags)
1014 {
1015         int i;
1016
1017         for (i = 0; i < placement->num_placement; i++) {
1018                 const struct ttm_place *heap = &placement->placement[i];
1019                 if (mem->mm_node &&
1020                     (mem->start < heap->fpfn ||
1021                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1022                         continue;
1023
1024                 *new_flags = heap->flags;
1025                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1026                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1027                         return true;
1028         }
1029
1030         for (i = 0; i < placement->num_busy_placement; i++) {
1031                 const struct ttm_place *heap = &placement->busy_placement[i];
1032                 if (mem->mm_node &&
1033                     (mem->start < heap->fpfn ||
1034                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1035                         continue;
1036
1037                 *new_flags = heap->flags;
1038                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1039                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1040                         return true;
1041         }
1042
1043         return false;
1044 }
1045
1046 int ttm_bo_validate(struct ttm_buffer_object *bo,
1047                         struct ttm_placement *placement,
1048                         bool interruptible,
1049                         bool no_wait_gpu)
1050 {
1051         int ret;
1052         uint32_t new_flags;
1053
1054         lockdep_assert_held(&bo->resv->lock.base);
1055         /*
1056          * Check whether we need to move buffer.
1057          */
1058         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1059                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1060                                          no_wait_gpu);
1061                 if (ret)
1062                         return ret;
1063         } else {
1064                 /*
1065                  * Use the access and other non-mapping-related flag bits from
1066                  * the compatible memory placement flags to the active flags
1067                  */
1068                 ttm_flag_masked(&bo->mem.placement, new_flags,
1069                                 ~TTM_PL_MASK_MEMTYPE);
1070         }
1071         /*
1072          * We might need to add a TTM.
1073          */
1074         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1075                 ret = ttm_bo_add_ttm(bo, true);
1076                 if (ret)
1077                         return ret;
1078         }
1079         return 0;
1080 }
1081 EXPORT_SYMBOL(ttm_bo_validate);
1082
1083 int ttm_bo_init(struct ttm_bo_device *bdev,
1084                 struct ttm_buffer_object *bo,
1085                 unsigned long size,
1086                 enum ttm_bo_type type,
1087                 struct ttm_placement *placement,
1088                 uint32_t page_alignment,
1089                 bool interruptible,
1090                 struct file *persistent_swap_storage,
1091                 size_t acc_size,
1092                 struct sg_table *sg,
1093                 struct reservation_object *resv,
1094                 void (*destroy) (struct ttm_buffer_object *))
1095 {
1096         int ret = 0;
1097         unsigned long num_pages;
1098         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1099         bool locked;
1100
1101         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1102         if (ret) {
1103                 pr_err("Out of kernel memory\n");
1104                 if (destroy)
1105                         (*destroy)(bo);
1106                 else
1107                         kfree(bo);
1108                 return -ENOMEM;
1109         }
1110
1111         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1112         if (num_pages == 0) {
1113                 pr_err("Illegal buffer object size\n");
1114                 if (destroy)
1115                         (*destroy)(bo);
1116                 else
1117                         kfree(bo);
1118                 ttm_mem_global_free(mem_glob, acc_size);
1119                 return -EINVAL;
1120         }
1121         bo->destroy = destroy;
1122
1123         kref_init(&bo->kref);
1124         kref_init(&bo->list_kref);
1125         atomic_set(&bo->cpu_writers, 0);
1126         INIT_LIST_HEAD(&bo->lru);
1127         INIT_LIST_HEAD(&bo->ddestroy);
1128         INIT_LIST_HEAD(&bo->swap);
1129         INIT_LIST_HEAD(&bo->io_reserve_lru);
1130         mutex_init(&bo->wu_mutex);
1131         bo->bdev = bdev;
1132         bo->glob = bdev->glob;
1133         bo->type = type;
1134         bo->num_pages = num_pages;
1135         bo->mem.size = num_pages << PAGE_SHIFT;
1136         bo->mem.mem_type = TTM_PL_SYSTEM;
1137         bo->mem.num_pages = bo->num_pages;
1138         bo->mem.mm_node = NULL;
1139         bo->mem.page_alignment = page_alignment;
1140         bo->mem.bus.io_reserved_vm = false;
1141         bo->mem.bus.io_reserved_count = 0;
1142         bo->moving = NULL;
1143         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1144         bo->persistent_swap_storage = persistent_swap_storage;
1145         bo->acc_size = acc_size;
1146         bo->sg = sg;
1147         if (resv) {
1148                 bo->resv = resv;
1149                 lockdep_assert_held(&bo->resv->lock.base);
1150         } else {
1151                 bo->resv = &bo->ttm_resv;
1152                 reservation_object_init(&bo->ttm_resv);
1153         }
1154         atomic_inc(&bo->glob->bo_count);
1155         drm_vma_node_reset(&bo->vma_node);
1156
1157         /*
1158          * For ttm_bo_type_device buffers, allocate
1159          * address space from the device.
1160          */
1161         if (bo->type == ttm_bo_type_device ||
1162             bo->type == ttm_bo_type_sg)
1163                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1164                                          bo->mem.num_pages);
1165
1166         /* passed reservation objects should already be locked,
1167          * since otherwise lockdep will be angered in radeon.
1168          */
1169         if (!resv) {
1170                 locked = ww_mutex_trylock(&bo->resv->lock);
1171                 WARN_ON(!locked);
1172         }
1173
1174         if (likely(!ret))
1175                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1176
1177         if (!resv) {
1178                 ttm_bo_unreserve(bo);
1179
1180         } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1181                 spin_lock(&bo->glob->lru_lock);
1182                 ttm_bo_add_to_lru(bo);
1183                 spin_unlock(&bo->glob->lru_lock);
1184         }
1185
1186         if (unlikely(ret))
1187                 ttm_bo_unref(&bo);
1188
1189         return ret;
1190 }
1191 EXPORT_SYMBOL(ttm_bo_init);
1192
1193 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1194                        unsigned long bo_size,
1195                        unsigned struct_size)
1196 {
1197         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1198         size_t size = 0;
1199
1200         size += ttm_round_pot(struct_size);
1201         size += ttm_round_pot(npages * sizeof(void *));
1202         size += ttm_round_pot(sizeof(struct ttm_tt));
1203         return size;
1204 }
1205 EXPORT_SYMBOL(ttm_bo_acc_size);
1206
1207 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1208                            unsigned long bo_size,
1209                            unsigned struct_size)
1210 {
1211         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1212         size_t size = 0;
1213
1214         size += ttm_round_pot(struct_size);
1215         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1216         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1217         return size;
1218 }
1219 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1220
1221 int ttm_bo_create(struct ttm_bo_device *bdev,
1222                         unsigned long size,
1223                         enum ttm_bo_type type,
1224                         struct ttm_placement *placement,
1225                         uint32_t page_alignment,
1226                         bool interruptible,
1227                         struct file *persistent_swap_storage,
1228                         struct ttm_buffer_object **p_bo)
1229 {
1230         struct ttm_buffer_object *bo;
1231         size_t acc_size;
1232         int ret;
1233
1234         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1235         if (unlikely(bo == NULL))
1236                 return -ENOMEM;
1237
1238         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1239         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1240                           interruptible, persistent_swap_storage, acc_size,
1241                           NULL, NULL, NULL);
1242         if (likely(ret == 0))
1243                 *p_bo = bo;
1244
1245         return ret;
1246 }
1247 EXPORT_SYMBOL(ttm_bo_create);
1248
1249 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1250                                         unsigned mem_type, bool allow_errors)
1251 {
1252         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1253         struct ttm_bo_global *glob = bdev->glob;
1254         int ret;
1255
1256         /*
1257          * Can't use standard list traversal since we're unlocking.
1258          */
1259
1260         spin_lock(&glob->lru_lock);
1261         while (!list_empty(&man->lru)) {
1262                 spin_unlock(&glob->lru_lock);
1263                 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1264                 if (ret) {
1265                         if (allow_errors) {
1266                                 return ret;
1267                         } else {
1268                                 pr_err("Cleanup eviction failed\n");
1269                         }
1270                 }
1271                 spin_lock(&glob->lru_lock);
1272         }
1273         spin_unlock(&glob->lru_lock);
1274         return 0;
1275 }
1276
1277 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1278 {
1279         struct ttm_mem_type_manager *man;
1280         int ret = -EINVAL;
1281
1282         if (mem_type >= TTM_NUM_MEM_TYPES) {
1283                 pr_err("Illegal memory type %d\n", mem_type);
1284                 return ret;
1285         }
1286         man = &bdev->man[mem_type];
1287
1288         if (!man->has_type) {
1289                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1290                        mem_type);
1291                 return ret;
1292         }
1293
1294         man->use_type = false;
1295         man->has_type = false;
1296
1297         ret = 0;
1298         if (mem_type > 0) {
1299                 ttm_bo_force_list_clean(bdev, mem_type, false);
1300
1301                 ret = (*man->func->takedown)(man);
1302         }
1303
1304         return ret;
1305 }
1306 EXPORT_SYMBOL(ttm_bo_clean_mm);
1307
1308 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1309 {
1310         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1311
1312         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1313                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1314                 return -EINVAL;
1315         }
1316
1317         if (!man->has_type) {
1318                 pr_err("Memory type %u has not been initialized\n", mem_type);
1319                 return 0;
1320         }
1321
1322         return ttm_bo_force_list_clean(bdev, mem_type, true);
1323 }
1324 EXPORT_SYMBOL(ttm_bo_evict_mm);
1325
1326 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1327                         unsigned long p_size)
1328 {
1329         int ret = -EINVAL;
1330         struct ttm_mem_type_manager *man;
1331
1332         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1333         man = &bdev->man[type];
1334         BUG_ON(man->has_type);
1335         man->io_reserve_fastpath = true;
1336         man->use_io_reserve_lru = false;
1337         mutex_init(&man->io_reserve_mutex);
1338         INIT_LIST_HEAD(&man->io_reserve_lru);
1339
1340         ret = bdev->driver->init_mem_type(bdev, type, man);
1341         if (ret)
1342                 return ret;
1343         man->bdev = bdev;
1344
1345         ret = 0;
1346         if (type != TTM_PL_SYSTEM) {
1347                 ret = (*man->func->init)(man, p_size);
1348                 if (ret)
1349                         return ret;
1350         }
1351         man->has_type = true;
1352         man->use_type = true;
1353         man->size = p_size;
1354
1355         INIT_LIST_HEAD(&man->lru);
1356
1357         return 0;
1358 }
1359 EXPORT_SYMBOL(ttm_bo_init_mm);
1360
1361 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1362 {
1363         struct ttm_bo_global *glob =
1364                 container_of(kobj, struct ttm_bo_global, kobj);
1365
1366         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1367         __free_page(glob->dummy_read_page);
1368         kfree(glob);
1369 }
1370
1371 void ttm_bo_global_release(struct drm_global_reference *ref)
1372 {
1373         struct ttm_bo_global *glob = ref->object;
1374
1375         kobject_del(&glob->kobj);
1376         kobject_put(&glob->kobj);
1377 }
1378 EXPORT_SYMBOL(ttm_bo_global_release);
1379
1380 int ttm_bo_global_init(struct drm_global_reference *ref)
1381 {
1382         struct ttm_bo_global_ref *bo_ref =
1383                 container_of(ref, struct ttm_bo_global_ref, ref);
1384         struct ttm_bo_global *glob = ref->object;
1385         int ret;
1386
1387         mutex_init(&glob->device_list_mutex);
1388         spin_lock_init(&glob->lru_lock);
1389         glob->mem_glob = bo_ref->mem_glob;
1390         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1391
1392         if (unlikely(glob->dummy_read_page == NULL)) {
1393                 ret = -ENOMEM;
1394                 goto out_no_drp;
1395         }
1396
1397         INIT_LIST_HEAD(&glob->swap_lru);
1398         INIT_LIST_HEAD(&glob->device_list);
1399
1400         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1401         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1402         if (unlikely(ret != 0)) {
1403                 pr_err("Could not register buffer object swapout\n");
1404                 goto out_no_shrink;
1405         }
1406
1407         atomic_set(&glob->bo_count, 0);
1408
1409         ret = kobject_init_and_add(
1410                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1411         if (unlikely(ret != 0))
1412                 kobject_put(&glob->kobj);
1413         return ret;
1414 out_no_shrink:
1415         __free_page(glob->dummy_read_page);
1416 out_no_drp:
1417         kfree(glob);
1418         return ret;
1419 }
1420 EXPORT_SYMBOL(ttm_bo_global_init);
1421
1422
1423 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1424 {
1425         int ret = 0;
1426         unsigned i = TTM_NUM_MEM_TYPES;
1427         struct ttm_mem_type_manager *man;
1428         struct ttm_bo_global *glob = bdev->glob;
1429
1430         while (i--) {
1431                 man = &bdev->man[i];
1432                 if (man->has_type) {
1433                         man->use_type = false;
1434                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1435                                 ret = -EBUSY;
1436                                 pr_err("DRM memory manager type %d is not clean\n",
1437                                        i);
1438                         }
1439                         man->has_type = false;
1440                 }
1441         }
1442
1443         mutex_lock(&glob->device_list_mutex);
1444         list_del(&bdev->device_list);
1445         mutex_unlock(&glob->device_list_mutex);
1446
1447         cancel_delayed_work_sync(&bdev->wq);
1448
1449         while (ttm_bo_delayed_delete(bdev, true))
1450                 ;
1451
1452         spin_lock(&glob->lru_lock);
1453         if (list_empty(&bdev->ddestroy))
1454                 TTM_DEBUG("Delayed destroy list was clean\n");
1455
1456         if (list_empty(&bdev->man[0].lru))
1457                 TTM_DEBUG("Swap list was clean\n");
1458         spin_unlock(&glob->lru_lock);
1459
1460         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1461
1462         return ret;
1463 }
1464 EXPORT_SYMBOL(ttm_bo_device_release);
1465
1466 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1467                        struct ttm_bo_global *glob,
1468                        struct ttm_bo_driver *driver,
1469                        struct address_space *mapping,
1470                        uint64_t file_page_offset,
1471                        bool need_dma32)
1472 {
1473         int ret = -EINVAL;
1474
1475         bdev->driver = driver;
1476
1477         memset(bdev->man, 0, sizeof(bdev->man));
1478
1479         /*
1480          * Initialize the system memory buffer type.
1481          * Other types need to be driver / IOCTL initialized.
1482          */
1483         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1484         if (unlikely(ret != 0))
1485                 goto out_no_sys;
1486
1487         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1488                                     0x10000000);
1489         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1490         INIT_LIST_HEAD(&bdev->ddestroy);
1491         bdev->dev_mapping = mapping;
1492         bdev->glob = glob;
1493         bdev->need_dma32 = need_dma32;
1494         mutex_lock(&glob->device_list_mutex);
1495         list_add_tail(&bdev->device_list, &glob->device_list);
1496         mutex_unlock(&glob->device_list_mutex);
1497
1498         return 0;
1499 out_no_sys:
1500         return ret;
1501 }
1502 EXPORT_SYMBOL(ttm_bo_device_init);
1503
1504 /*
1505  * buffer object vm functions.
1506  */
1507
1508 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1509 {
1510         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1511
1512         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1513                 if (mem->mem_type == TTM_PL_SYSTEM)
1514                         return false;
1515
1516                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1517                         return false;
1518
1519                 if (mem->placement & TTM_PL_FLAG_CACHED)
1520                         return false;
1521         }
1522         return true;
1523 }
1524
1525 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1526 {
1527         struct ttm_bo_device *bdev = bo->bdev;
1528
1529         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1530         ttm_mem_io_free_vm(bo);
1531 }
1532
1533 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1534 {
1535         struct ttm_bo_device *bdev = bo->bdev;
1536         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1537
1538         ttm_mem_io_lock(man, false);
1539         ttm_bo_unmap_virtual_locked(bo);
1540         ttm_mem_io_unlock(man);
1541 }
1542
1543
1544 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1545
1546 int ttm_bo_wait(struct ttm_buffer_object *bo,
1547                 bool interruptible, bool no_wait)
1548 {
1549         long timeout = no_wait ? 0 : 15 * HZ;
1550
1551         timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1552                                                       interruptible, timeout);
1553         if (timeout < 0)
1554                 return timeout;
1555
1556         if (timeout == 0)
1557                 return -EBUSY;
1558
1559         reservation_object_add_excl_fence(bo->resv, NULL);
1560         return 0;
1561 }
1562 EXPORT_SYMBOL(ttm_bo_wait);
1563
1564 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1565 {
1566         int ret = 0;
1567
1568         /*
1569          * Using ttm_bo_reserve makes sure the lru lists are updated.
1570          */
1571
1572         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1573         if (unlikely(ret != 0))
1574                 return ret;
1575         ret = ttm_bo_wait(bo, true, no_wait);
1576         if (likely(ret == 0))
1577                 atomic_inc(&bo->cpu_writers);
1578         ttm_bo_unreserve(bo);
1579         return ret;
1580 }
1581 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1582
1583 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1584 {
1585         atomic_dec(&bo->cpu_writers);
1586 }
1587 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1588
1589 /**
1590  * A buffer object shrink method that tries to swap out the first
1591  * buffer object on the bo_global::swap_lru list.
1592  */
1593
1594 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1595 {
1596         struct ttm_bo_global *glob =
1597             container_of(shrink, struct ttm_bo_global, shrink);
1598         struct ttm_buffer_object *bo;
1599         int ret = -EBUSY;
1600         int put_count;
1601         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1602
1603         spin_lock(&glob->lru_lock);
1604         list_for_each_entry(bo, &glob->swap_lru, swap) {
1605                 ret = __ttm_bo_reserve(bo, false, true, NULL);
1606                 if (!ret)
1607                         break;
1608         }
1609
1610         if (ret) {
1611                 spin_unlock(&glob->lru_lock);
1612                 return ret;
1613         }
1614
1615         kref_get(&bo->list_kref);
1616
1617         if (!list_empty(&bo->ddestroy)) {
1618                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1619                 kref_put(&bo->list_kref, ttm_bo_release_list);
1620                 return ret;
1621         }
1622
1623         put_count = ttm_bo_del_from_lru(bo);
1624         spin_unlock(&glob->lru_lock);
1625
1626         ttm_bo_list_ref_sub(bo, put_count, true);
1627
1628         /**
1629          * Move to system cached
1630          */
1631
1632         if ((bo->mem.placement & swap_placement) != swap_placement) {
1633                 struct ttm_mem_reg evict_mem;
1634
1635                 evict_mem = bo->mem;
1636                 evict_mem.mm_node = NULL;
1637                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1638                 evict_mem.mem_type = TTM_PL_SYSTEM;
1639
1640                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1641                                              false, false);
1642                 if (unlikely(ret != 0))
1643                         goto out;
1644         }
1645
1646         /**
1647          * Make sure BO is idle.
1648          */
1649
1650         ret = ttm_bo_wait(bo, false, false);
1651         if (unlikely(ret != 0))
1652                 goto out;
1653
1654         ttm_bo_unmap_virtual(bo);
1655
1656         /**
1657          * Swap out. Buffer will be swapped in again as soon as
1658          * anyone tries to access a ttm page.
1659          */
1660
1661         if (bo->bdev->driver->swap_notify)
1662                 bo->bdev->driver->swap_notify(bo);
1663
1664         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1665 out:
1666
1667         /**
1668          *
1669          * Unreserve without putting on LRU to avoid swapping out an
1670          * already swapped buffer.
1671          */
1672
1673         __ttm_bo_unreserve(bo);
1674         kref_put(&bo->list_kref, ttm_bo_release_list);
1675         return ret;
1676 }
1677
1678 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1679 {
1680         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1681                 ;
1682 }
1683 EXPORT_SYMBOL(ttm_bo_swapout_all);
1684
1685 /**
1686  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1687  * unreserved
1688  *
1689  * @bo: Pointer to buffer
1690  */
1691 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1692 {
1693         int ret;
1694
1695         /*
1696          * In the absense of a wait_unlocked API,
1697          * Use the bo::wu_mutex to avoid triggering livelocks due to
1698          * concurrent use of this function. Note that this use of
1699          * bo::wu_mutex can go away if we change locking order to
1700          * mmap_sem -> bo::reserve.
1701          */
1702         ret = mutex_lock_interruptible(&bo->wu_mutex);
1703         if (unlikely(ret != 0))
1704                 return -ERESTARTSYS;
1705         if (!ww_mutex_is_locked(&bo->resv->lock))
1706                 goto out_unlock;
1707         ret = __ttm_bo_reserve(bo, true, false, NULL);
1708         if (unlikely(ret != 0))
1709                 goto out_unlock;
1710         __ttm_bo_unreserve(bo);
1711
1712 out_unlock:
1713         mutex_unlock(&bo->wu_mutex);
1714         return ret;
1715 }