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 pos;
  61
  62         pos = ffs(place->flags & TTM_PL_MASK_MEM);
  63         if (unlikely(!pos))
  64                 return -EINVAL;
  65
  66         *mem_type = pos - 1;
  67         return 0;
  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         struct drm_printer p = drm_debug_printer(TTM_PFX);
  74
  75         pr_err("    has_type: %d\n", man->has_type);
  76         pr_err("    use_type: %d\n", man->use_type);
  77         pr_err("    flags: 0x%08X\n", man->flags);
  78         pr_err("    gpu_offset: 0x%08llX\n", man->gpu_offset);
  79         pr_err("    size: %llu\n", man->size);
  80         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  81         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  82         if (mem_type != TTM_PL_SYSTEM)
  83                 (*man->func->debug)(man, &p);
  84 }
  85
  86 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  87                                         struct ttm_placement *placement)
  88 {
  89         int i, ret, mem_type;
  90
  91         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  92                bo, bo->mem.num_pages, bo->mem.size >> 10,
  93                bo->mem.size >> 20);
  94         for (i = 0; i < placement->num_placement; i++) {
  95                 ret = ttm_mem_type_from_place(&placement->placement[i],
  96                                                 &mem_type);
  97                 if (ret)
  98                         return;
  99                 pr_err("  placement[%d]=0x%08X (%d)\n",
 100                        i, placement->placement[i].flags, mem_type);
 101                 ttm_mem_type_debug(bo->bdev, mem_type);
 102         }
 103 }
 104
 105 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 106                                   struct attribute *attr,
 107                                   char *buffer)
 108 {
 109         struct ttm_bo_global *glob =
 110                 container_of(kobj, struct ttm_bo_global, kobj);
 111
 112         return snprintf(buffer, PAGE_SIZE, "%d\n",
 113                                 atomic_read(&glob->bo_count));
 114 }
 115
 116 static struct attribute *ttm_bo_global_attrs[] = {
 117         &ttm_bo_count,
 118         NULL
 119 };
 120
 121 static const struct sysfs_ops ttm_bo_global_ops = {
 122         .show = &ttm_bo_global_show
 123 };
 124
 125 static struct kobj_type ttm_bo_glob_kobj_type  = {
 126         .release = &ttm_bo_global_kobj_release,
 127         .sysfs_ops = &ttm_bo_global_ops,
 128         .default_attrs = ttm_bo_global_attrs
 129 };
 130
 131
 132 static inline uint32_t ttm_bo_type_flags(unsigned type)
 133 {
 134         return 1 << (type);
 135 }
 136
 137 static void ttm_bo_release_list(struct kref *list_kref)
 138 {
 139         struct ttm_buffer_object *bo =
 140             container_of(list_kref, struct ttm_buffer_object, list_kref);
 141         struct ttm_bo_device *bdev = bo->bdev;
 142         size_t acc_size = bo->acc_size;
 143
 144         BUG_ON(kref_read(&bo->list_kref));
 145         BUG_ON(kref_read(&bo->kref));
 146         BUG_ON(atomic_read(&bo->cpu_writers));
 147         BUG_ON(bo->mem.mm_node != NULL);
 148         BUG_ON(!list_empty(&bo->lru));
 149         BUG_ON(!list_empty(&bo->ddestroy));
 150         ttm_tt_destroy(bo->ttm);
 151         atomic_dec(&bo->glob->bo_count);
 152         dma_fence_put(bo->moving);
 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         struct ttm_mem_type_manager *man;
 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                 man = &bdev->man[bo->mem.mem_type];
 175                 list_add_tail(&bo->lru, &man->lru[bo->priority]);
 176                 kref_get(&bo->list_kref);
 177
 178                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 179                         list_add_tail(&bo->swap,
 180                                       &bo->glob->swap_lru[bo->priority]);
 181                         kref_get(&bo->list_kref);
 182                 }
 183         }
 184 }
 185 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 186
 187 static void ttm_bo_ref_bug(struct kref *list_kref)
 188 {
 189         BUG();
 190 }
 191
 192 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 193 {
 194         if (!list_empty(&bo->swap)) {
 195                 list_del_init(&bo->swap);
 196                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 197         }
 198         if (!list_empty(&bo->lru)) {
 199                 list_del_init(&bo->lru);
 200                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 201         }
 202
 203         /*
 204          * TODO: Add a driver hook to delete from
 205          * driver-specific LRU's here.
 206          */
 207 }
 208
 209 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 210 {
 211         spin_lock(&bo->glob->lru_lock);
 212         ttm_bo_del_from_lru(bo);
 213         spin_unlock(&bo->glob->lru_lock);
 214 }
 215 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 216
 217 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 218 {
 219         lockdep_assert_held(&bo->resv->lock.base);
 220
 221         ttm_bo_del_from_lru(bo);
 222         ttm_bo_add_to_lru(bo);
 223 }
 224 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 225
 226 /*
 227  * Call bo->mutex locked.
 228  */
 229 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 230 {
 231         struct ttm_bo_device *bdev = bo->bdev;
 232         struct ttm_bo_global *glob = bo->glob;
 233         int ret = 0;
 234         uint32_t page_flags = 0;
 235
 236         TTM_ASSERT_LOCKED(&bo->mutex);
 237         bo->ttm = NULL;
 238
 239         if (bdev->need_dma32)
 240                 page_flags |= TTM_PAGE_FLAG_DMA32;
 241
 242         switch (bo->type) {
 243         case ttm_bo_type_device:
 244                 if (zero_alloc)
 245                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 246         case ttm_bo_type_kernel:
 247                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 248                                                       page_flags, glob->dummy_read_page);
 249                 if (unlikely(bo->ttm == NULL))
 250                         ret = -ENOMEM;
 251                 break;
 252         case ttm_bo_type_sg:
 253                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 254                                                       page_flags | TTM_PAGE_FLAG_SG,
 255                                                       glob->dummy_read_page);
 256                 if (unlikely(bo->ttm == NULL)) {
 257                         ret = -ENOMEM;
 258                         break;
 259                 }
 260                 bo->ttm->sg = bo->sg;
 261                 break;
 262         default:
 263                 pr_err("Illegal buffer object type\n");
 264                 ret = -EINVAL;
 265                 break;
 266         }
 267
 268         return ret;
 269 }
 270
 271 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 272                                   struct ttm_mem_reg *mem,
 273                                   bool evict, bool interruptible,
 274                                   bool no_wait_gpu)
 275 {
 276         struct ttm_bo_device *bdev = bo->bdev;
 277         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 278         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 279         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 280         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 281         int ret = 0;
 282
 283         if (old_is_pci || new_is_pci ||
 284             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 285                 ret = ttm_mem_io_lock(old_man, true);
 286                 if (unlikely(ret != 0))
 287                         goto out_err;
 288                 ttm_bo_unmap_virtual_locked(bo);
 289                 ttm_mem_io_unlock(old_man);
 290         }
 291
 292         /*
 293          * Create and bind a ttm if required.
 294          */
 295
 296         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 297                 if (bo->ttm == NULL) {
 298                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 299                         ret = ttm_bo_add_ttm(bo, zero);
 300                         if (ret)
 301                                 goto out_err;
 302                 }
 303
 304                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 305                 if (ret)
 306                         goto out_err;
 307
 308                 if (mem->mem_type != TTM_PL_SYSTEM) {
 309                         ret = ttm_tt_bind(bo->ttm, mem);
 310                         if (ret)
 311                                 goto out_err;
 312                 }
 313
 314                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 315                         if (bdev->driver->move_notify)
 316                                 bdev->driver->move_notify(bo, evict, mem);
 317                         bo->mem = *mem;
 318                         mem->mm_node = NULL;
 319                         goto moved;
 320                 }
 321         }
 322
 323         if (bdev->driver->move_notify)
 324                 bdev->driver->move_notify(bo, evict, mem);
 325
 326         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 327             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 328                 ret = ttm_bo_move_ttm(bo, interruptible, no_wait_gpu, mem);
 329         else if (bdev->driver->move)
 330                 ret = bdev->driver->move(bo, evict, interruptible,
 331                                          no_wait_gpu, mem);
 332         else
 333                 ret = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, mem);
 334
 335         if (ret) {
 336                 if (bdev->driver->move_notify) {
 337                         struct ttm_mem_reg tmp_mem = *mem;
 338                         *mem = bo->mem;
 339                         bo->mem = tmp_mem;
 340                         bdev->driver->move_notify(bo, false, mem);
 341                         bo->mem = *mem;
 342                         *mem = tmp_mem;
 343                 }
 344
 345                 goto out_err;
 346         }
 347
 348 moved:
 349         if (bo->evicted) {
 350                 if (bdev->driver->invalidate_caches) {
 351                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 352                         if (ret)
 353                                 pr_err("Can not flush read caches\n");
 354                 }
 355                 bo->evicted = false;
 356         }
 357
 358         if (bo->mem.mm_node) {
 359                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 360                     bdev->man[bo->mem.mem_type].gpu_offset;
 361                 bo->cur_placement = bo->mem.placement;
 362         } else
 363                 bo->offset = 0;
 364
 365         return 0;
 366
 367 out_err:
 368         new_man = &bdev->man[bo->mem.mem_type];
 369         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 370                 ttm_tt_destroy(bo->ttm);
 371                 bo->ttm = NULL;
 372         }
 373
 374         return ret;
 375 }
 376
 377 /**
 378  * Call bo::reserved.
 379  * Will release GPU memory type usage on destruction.
 380  * This is the place to put in driver specific hooks to release
 381  * driver private resources.
 382  * Will release the bo::reserved lock.
 383  */
 384
 385 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 386 {
 387         if (bo->bdev->driver->move_notify)
 388                 bo->bdev->driver->move_notify(bo, false, NULL);
 389
 390         ttm_tt_destroy(bo->ttm);
 391         bo->ttm = NULL;
 392         ttm_bo_mem_put(bo, &bo->mem);
 393
 394         ww_mutex_unlock (&bo->resv->lock);
 395 }
 396
 397 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 398 {
 399         int r;
 400
 401         if (bo->resv == &bo->ttm_resv)
 402                 return 0;
 403
 404         BUG_ON(!reservation_object_trylock(&bo->ttm_resv));
 405
 406         r = reservation_object_copy_fences(&bo->ttm_resv, bo->resv);
 407         if (r)
 408                 reservation_object_unlock(&bo->ttm_resv);
 409
 410         return r;
 411 }
 412
 413 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 414 {
 415         struct reservation_object_list *fobj;
 416         struct dma_fence *fence;
 417         int i;
 418
 419         fobj = reservation_object_get_list(&bo->ttm_resv);
 420         fence = reservation_object_get_excl(&bo->ttm_resv);
 421         if (fence && !fence->ops->signaled)
 422                 dma_fence_enable_sw_signaling(fence);
 423
 424         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 425                 fence = rcu_dereference_protected(fobj->shared[i],
 426                                         reservation_object_held(bo->resv));
 427
 428                 if (!fence->ops->signaled)
 429                         dma_fence_enable_sw_signaling(fence);
 430         }
 431 }
 432
 433 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 434 {
 435         struct ttm_bo_device *bdev = bo->bdev;
 436         struct ttm_bo_global *glob = bo->glob;
 437         int ret;
 438
 439         ret = ttm_bo_individualize_resv(bo);
 440         if (ret) {
 441                 /* Last resort, if we fail to allocate memory for the
 442                  * fences block for the BO to become idle
 443                  */
 444                 reservation_object_wait_timeout_rcu(bo->resv, true, false,
 445                                                     30 * HZ);
 446                 spin_lock(&glob->lru_lock);
 447                 goto error;
 448         }
 449
 450         spin_lock(&glob->lru_lock);
 451         ret = __ttm_bo_reserve(bo, false, true, NULL);
 452         if (!ret) {
 453                 if (reservation_object_test_signaled_rcu(&bo->ttm_resv, true)) {
 454                         ttm_bo_del_from_lru(bo);
 455                         spin_unlock(&glob->lru_lock);
 456                         if (bo->resv != &bo->ttm_resv)
 457                                 reservation_object_unlock(&bo->ttm_resv);
 458
 459                         ttm_bo_cleanup_memtype_use(bo);
 460                         return;
 461                 }
 462
 463                 ttm_bo_flush_all_fences(bo);
 464
 465                 /*
 466                  * Make NO_EVICT bos immediately available to
 467                  * shrinkers, now that they are queued for
 468                  * destruction.
 469                  */
 470                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 471                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 472                         ttm_bo_add_to_lru(bo);
 473                 }
 474
 475                 __ttm_bo_unreserve(bo);
 476         }
 477         if (bo->resv != &bo->ttm_resv)
 478                 reservation_object_unlock(&bo->ttm_resv);
 479
 480 error:
 481         kref_get(&bo->list_kref);
 482         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 483         spin_unlock(&glob->lru_lock);
 484
 485         schedule_delayed_work(&bdev->wq,
 486                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 487 }
 488
 489 /**
 490  * function ttm_bo_cleanup_refs_and_unlock
 491  * If bo idle, remove from delayed- and lru lists, and unref.
 492  * If not idle, do nothing.
 493  *
 494  * Must be called with lru_lock and reservation held, this function
 495  * will drop both before returning.
 496  *
 497  * @interruptible         Any sleeps should occur interruptibly.
 498  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 499  */
 500
 501 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 502                                           bool interruptible,
 503                                           bool no_wait_gpu)
 504 {
 505         struct ttm_bo_global *glob = bo->glob;
 506         struct reservation_object *resv;
 507         int ret;
 508
 509         if (unlikely(list_empty(&bo->ddestroy)))
 510                 resv = bo->resv;
 511         else
 512                 resv = &bo->ttm_resv;
 513
 514         if (reservation_object_test_signaled_rcu(resv, true))
 515                 ret = 0;
 516         else
 517                 ret = -EBUSY;
 518
 519         if (ret && !no_wait_gpu) {
 520                 long lret;
 521                 ww_mutex_unlock(&bo->resv->lock);
 522                 spin_unlock(&glob->lru_lock);
 523
 524                 lret = reservation_object_wait_timeout_rcu(resv, true,
 525                                                            interruptible,
 526                                                            30 * HZ);
 527
 528                 if (lret < 0)
 529                         return lret;
 530                 else if (lret == 0)
 531                         return -EBUSY;
 532
 533                 spin_lock(&glob->lru_lock);
 534                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 535
 536                 /*
 537                  * We raced, and lost, someone else holds the reservation now,
 538                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 539                  *
 540                  * Even if it's not the case, because we finished waiting any
 541                  * delayed destruction would succeed, so just return success
 542                  * here.
 543                  */
 544                 if (ret) {
 545                         spin_unlock(&glob->lru_lock);
 546                         return 0;
 547                 }
 548         }
 549
 550         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 551                 __ttm_bo_unreserve(bo);
 552                 spin_unlock(&glob->lru_lock);
 553                 return ret;
 554         }
 555
 556         ttm_bo_del_from_lru(bo);
 557         list_del_init(&bo->ddestroy);
 558         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 559
 560         spin_unlock(&glob->lru_lock);
 561         ttm_bo_cleanup_memtype_use(bo);
 562
 563         return 0;
 564 }
 565
 566 /**
 567  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 568  * encountered buffers.
 569  */
 570
 571 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 572 {
 573         struct ttm_bo_global *glob = bdev->glob;
 574         struct ttm_buffer_object *entry = NULL;
 575         int ret = 0;
 576
 577         spin_lock(&glob->lru_lock);
 578         if (list_empty(&bdev->ddestroy))
 579                 goto out_unlock;
 580
 581         entry = list_first_entry(&bdev->ddestroy,
 582                 struct ttm_buffer_object, ddestroy);
 583         kref_get(&entry->list_kref);
 584
 585         for (;;) {
 586                 struct ttm_buffer_object *nentry = NULL;
 587
 588                 if (entry->ddestroy.next != &bdev->ddestroy) {
 589                         nentry = list_first_entry(&entry->ddestroy,
 590                                 struct ttm_buffer_object, ddestroy);
 591                         kref_get(&nentry->list_kref);
 592                 }
 593
 594                 ret = __ttm_bo_reserve(entry, false, true, NULL);
 595                 if (remove_all && ret) {
 596                         spin_unlock(&glob->lru_lock);
 597                         ret = __ttm_bo_reserve(entry, false, false, NULL);
 598                         spin_lock(&glob->lru_lock);
 599                 }
 600
 601                 if (!ret)
 602                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 603                                                              !remove_all);
 604                 else
 605                         spin_unlock(&glob->lru_lock);
 606
 607                 kref_put(&entry->list_kref, ttm_bo_release_list);
 608                 entry = nentry;
 609
 610                 if (ret || !entry)
 611                         goto out;
 612
 613                 spin_lock(&glob->lru_lock);
 614                 if (list_empty(&entry->ddestroy))
 615                         break;
 616         }
 617
 618 out_unlock:
 619         spin_unlock(&glob->lru_lock);
 620 out:
 621         if (entry)
 622                 kref_put(&entry->list_kref, ttm_bo_release_list);
 623         return ret;
 624 }
 625
 626 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 627 {
 628         struct ttm_bo_device *bdev =
 629             container_of(work, struct ttm_bo_device, wq.work);
 630
 631         if (ttm_bo_delayed_delete(bdev, false)) {
 632                 schedule_delayed_work(&bdev->wq,
 633                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 634         }
 635 }
 636
 637 static void ttm_bo_release(struct kref *kref)
 638 {
 639         struct ttm_buffer_object *bo =
 640             container_of(kref, struct ttm_buffer_object, kref);
 641         struct ttm_bo_device *bdev = bo->bdev;
 642         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 643
 644         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 645         ttm_mem_io_lock(man, false);
 646         ttm_mem_io_free_vm(bo);
 647         ttm_mem_io_unlock(man);
 648         ttm_bo_cleanup_refs_or_queue(bo);
 649         kref_put(&bo->list_kref, ttm_bo_release_list);
 650 }
 651
 652 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 653 {
 654         struct ttm_buffer_object *bo = *p_bo;
 655
 656         *p_bo = NULL;
 657         kref_put(&bo->kref, ttm_bo_release);
 658 }
 659 EXPORT_SYMBOL(ttm_bo_unref);
 660
 661 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 662 {
 663         return cancel_delayed_work_sync(&bdev->wq);
 664 }
 665 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 666
 667 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 668 {
 669         if (resched)
 670                 schedule_delayed_work(&bdev->wq,
 671                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 672 }
 673 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 674
 675 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 676                         bool no_wait_gpu)
 677 {
 678         struct ttm_bo_device *bdev = bo->bdev;
 679         struct ttm_mem_reg evict_mem;
 680         struct ttm_placement placement;
 681         int ret = 0;
 682
 683         lockdep_assert_held(&bo->resv->lock.base);
 684
 685         evict_mem = bo->mem;
 686         evict_mem.mm_node = NULL;
 687         evict_mem.bus.io_reserved_vm = false;
 688         evict_mem.bus.io_reserved_count = 0;
 689
 690         placement.num_placement = 0;
 691         placement.num_busy_placement = 0;
 692         bdev->driver->evict_flags(bo, &placement);
 693         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 694                                 no_wait_gpu);
 695         if (ret) {
 696                 if (ret != -ERESTARTSYS) {
 697                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 698                                bo);
 699                         ttm_bo_mem_space_debug(bo, &placement);
 700                 }
 701                 goto out;
 702         }
 703
 704         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 705                                      no_wait_gpu);
 706         if (unlikely(ret)) {
 707                 if (ret != -ERESTARTSYS)
 708                         pr_err("Buffer eviction failed\n");
 709                 ttm_bo_mem_put(bo, &evict_mem);
 710                 goto out;
 711         }
 712         bo->evicted = true;
 713 out:
 714         return ret;
 715 }
 716
 717 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 718                               const struct ttm_place *place)
 719 {
 720         /* Don't evict this BO if it's outside of the
 721          * requested placement range
 722          */
 723         if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 724             (place->lpfn && place->lpfn <= bo->mem.start))
 725                 return false;
 726
 727         return true;
 728 }
 729 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 730
 731 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 732                                 uint32_t mem_type,
 733                                 const struct ttm_place *place,
 734                                 bool interruptible,
 735                                 bool no_wait_gpu)
 736 {
 737         struct ttm_bo_global *glob = bdev->glob;
 738         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 739         struct ttm_buffer_object *bo;
 740         int ret = -EBUSY;
 741         unsigned i;
 742
 743         spin_lock(&glob->lru_lock);
 744         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 745                 list_for_each_entry(bo, &man->lru[i], lru) {
 746                         ret = __ttm_bo_reserve(bo, false, true, NULL);
 747                         if (ret)
 748                                 continue;
 749
 750                         if (place && !bdev->driver->eviction_valuable(bo,
 751                                                                       place)) {
 752                                 __ttm_bo_unreserve(bo);
 753                                 ret = -EBUSY;
 754                                 continue;
 755                         }
 756
 757                         break;
 758                 }
 759
 760                 if (!ret)
 761                         break;
 762         }
 763
 764         if (ret) {
 765                 spin_unlock(&glob->lru_lock);
 766                 return ret;
 767         }
 768
 769         kref_get(&bo->list_kref);
 770
 771         if (!list_empty(&bo->ddestroy)) {
 772                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 773                                                      no_wait_gpu);
 774                 kref_put(&bo->list_kref, ttm_bo_release_list);
 775                 return ret;
 776         }
 777
 778         ttm_bo_del_from_lru(bo);
 779         spin_unlock(&glob->lru_lock);
 780
 781         BUG_ON(ret != 0);
 782
 783         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 784         ttm_bo_unreserve(bo);
 785
 786         kref_put(&bo->list_kref, ttm_bo_release_list);
 787         return ret;
 788 }
 789
 790 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 791 {
 792         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 793
 794         if (mem->mm_node)
 795                 (*man->func->put_node)(man, mem);
 796 }
 797 EXPORT_SYMBOL(ttm_bo_mem_put);
 798
 799 /**
 800  * Add the last move fence to the BO and reserve a new shared slot.
 801  */
 802 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 803                                  struct ttm_mem_type_manager *man,
 804                                  struct ttm_mem_reg *mem)
 805 {
 806         struct dma_fence *fence;
 807         int ret;
 808
 809         spin_lock(&man->move_lock);
 810         fence = dma_fence_get(man->move);
 811         spin_unlock(&man->move_lock);
 812
 813         if (fence) {
 814                 reservation_object_add_shared_fence(bo->resv, fence);
 815
 816                 ret = reservation_object_reserve_shared(bo->resv);
 817                 if (unlikely(ret))
 818                         return ret;
 819
 820                 dma_fence_put(bo->moving);
 821                 bo->moving = fence;
 822         }
 823
 824         return 0;
 825 }
 826
 827 /**
 828  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 829  * space, or we've evicted everything and there isn't enough space.
 830  */
 831 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 832                                         uint32_t mem_type,
 833                                         const struct ttm_place *place,
 834                                         struct ttm_mem_reg *mem,
 835                                         bool interruptible,
 836                                         bool no_wait_gpu)
 837 {
 838         struct ttm_bo_device *bdev = bo->bdev;
 839         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 840         int ret;
 841
 842         do {
 843                 ret = (*man->func->get_node)(man, bo, place, mem);
 844                 if (unlikely(ret != 0))
 845                         return ret;
 846                 if (mem->mm_node)
 847                         break;
 848                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 849                                           interruptible, no_wait_gpu);
 850                 if (unlikely(ret != 0))
 851                         return ret;
 852         } while (1);
 853         mem->mem_type = mem_type;
 854         return ttm_bo_add_move_fence(bo, man, mem);
 855 }
 856
 857 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 858                                       uint32_t cur_placement,
 859                                       uint32_t proposed_placement)
 860 {
 861         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 862         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 863
 864         /**
 865          * Keep current caching if possible.
 866          */
 867
 868         if ((cur_placement & caching) != 0)
 869                 result |= (cur_placement & caching);
 870         else if ((man->default_caching & caching) != 0)
 871                 result |= man->default_caching;
 872         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 873                 result |= TTM_PL_FLAG_CACHED;
 874         else if ((TTM_PL_FLAG_WC & caching) != 0)
 875                 result |= TTM_PL_FLAG_WC;
 876         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 877                 result |= TTM_PL_FLAG_UNCACHED;
 878
 879         return result;
 880 }
 881
 882 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 883                                  uint32_t mem_type,
 884                                  const struct ttm_place *place,
 885                                  uint32_t *masked_placement)
 886 {
 887         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 888
 889         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 890                 return false;
 891
 892         if ((place->flags & man->available_caching) == 0)
 893                 return false;
 894
 895         cur_flags |= (place->flags & man->available_caching);
 896
 897         *masked_placement = cur_flags;
 898         return true;
 899 }
 900
 901 /**
 902  * Creates space for memory region @mem according to its type.
 903  *
 904  * This function first searches for free space in compatible memory types in
 905  * the priority order defined by the driver.  If free space isn't found, then
 906  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 907  * space.
 908  */
 909 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 910                         struct ttm_placement *placement,
 911                         struct ttm_mem_reg *mem,
 912                         bool interruptible,
 913                         bool no_wait_gpu)
 914 {
 915         struct ttm_bo_device *bdev = bo->bdev;
 916         struct ttm_mem_type_manager *man;
 917         uint32_t mem_type = TTM_PL_SYSTEM;
 918         uint32_t cur_flags = 0;
 919         bool type_found = false;
 920         bool type_ok = false;
 921         bool has_erestartsys = false;
 922         int i, ret;
 923
 924         ret = reservation_object_reserve_shared(bo->resv);
 925         if (unlikely(ret))
 926                 return ret;
 927
 928         mem->mm_node = NULL;
 929         for (i = 0; i < placement->num_placement; ++i) {
 930                 const struct ttm_place *place = &placement->placement[i];
 931
 932                 ret = ttm_mem_type_from_place(place, &mem_type);
 933                 if (ret)
 934                         return ret;
 935                 man = &bdev->man[mem_type];
 936                 if (!man->has_type || !man->use_type)
 937                         continue;
 938
 939                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 940                                                 &cur_flags);
 941
 942                 if (!type_ok)
 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                         break;
 957
 958                 ret = (*man->func->get_node)(man, bo, place, mem);
 959                 if (unlikely(ret))
 960                         return ret;
 961
 962                 if (mem->mm_node) {
 963                         ret = ttm_bo_add_move_fence(bo, man, mem);
 964                         if (unlikely(ret)) {
 965                                 (*man->func->put_node)(man, mem);
 966                                 return ret;
 967                         }
 968                         break;
 969                 }
 970         }
 971
 972         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 973                 mem->mem_type = mem_type;
 974                 mem->placement = cur_flags;
 975                 return 0;
 976         }
 977
 978         for (i = 0; i < placement->num_busy_placement; ++i) {
 979                 const struct ttm_place *place = &placement->busy_placement[i];
 980
 981                 ret = ttm_mem_type_from_place(place, &mem_type);
 982                 if (ret)
 983                         return ret;
 984                 man = &bdev->man[mem_type];
 985                 if (!man->has_type || !man->use_type)
 986                         continue;
 987                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 988                         continue;
 989
 990                 type_found = true;
 991                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 992                                                   cur_flags);
 993                 /*
 994                  * Use the access and other non-mapping-related flag bits from
 995                  * the memory placement flags to the current flags
 996                  */
 997                 ttm_flag_masked(&cur_flags, place->flags,
 998                                 ~TTM_PL_MASK_MEMTYPE);
 999
1000                 if (mem_type == TTM_PL_SYSTEM) {
1001                         mem->mem_type = mem_type;
1002                         mem->placement = cur_flags;
1003                         mem->mm_node = NULL;
1004                         return 0;
1005                 }
1006
1007                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
1008                                                 interruptible, no_wait_gpu);
1009                 if (ret == 0 && mem->mm_node) {
1010                         mem->placement = cur_flags;
1011                         return 0;
1012                 }
1013                 if (ret == -ERESTARTSYS)
1014                         has_erestartsys = true;
1015         }
1016
1017         if (!type_found) {
1018                 pr_err(TTM_PFX "No compatible memory type found\n");
1019                 return -EINVAL;
1020         }
1021
1022         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1023 }
1024 EXPORT_SYMBOL(ttm_bo_mem_space);
1025
1026 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1027                         struct ttm_placement *placement,
1028                         bool interruptible,
1029                         bool no_wait_gpu)
1030 {
1031         int ret = 0;
1032         struct ttm_mem_reg mem;
1033
1034         lockdep_assert_held(&bo->resv->lock.base);
1035
1036         mem.num_pages = bo->num_pages;
1037         mem.size = mem.num_pages << PAGE_SHIFT;
1038         mem.page_alignment = bo->mem.page_alignment;
1039         mem.bus.io_reserved_vm = false;
1040         mem.bus.io_reserved_count = 0;
1041         /*
1042          * Determine where to move the buffer.
1043          */
1044         ret = ttm_bo_mem_space(bo, placement, &mem,
1045                                interruptible, no_wait_gpu);
1046         if (ret)
1047                 goto out_unlock;
1048         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1049                                      interruptible, no_wait_gpu);
1050 out_unlock:
1051         if (ret && mem.mm_node)
1052                 ttm_bo_mem_put(bo, &mem);
1053         return ret;
1054 }
1055
1056 static bool ttm_bo_places_compat(const struct ttm_place *places,
1057                                  unsigned num_placement,
1058                                  struct ttm_mem_reg *mem,
1059                                  uint32_t *new_flags)
1060 {
1061         unsigned i;
1062
1063         for (i = 0; i < num_placement; i++) {
1064                 const struct ttm_place *heap = &places[i];
1065
1066                 if (mem->mm_node && (mem->start < heap->fpfn ||
1067                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1068                         continue;
1069
1070                 *new_flags = heap->flags;
1071                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1072                     (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1073                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1074                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1075                         return true;
1076         }
1077         return false;
1078 }
1079
1080 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1081                        struct ttm_mem_reg *mem,
1082                        uint32_t *new_flags)
1083 {
1084         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1085                                  mem, new_flags))
1086                 return true;
1087
1088         if ((placement->busy_placement != placement->placement ||
1089              placement->num_busy_placement > placement->num_placement) &&
1090             ttm_bo_places_compat(placement->busy_placement,
1091                                  placement->num_busy_placement,
1092                                  mem, new_flags))
1093                 return true;
1094
1095         return false;
1096 }
1097 EXPORT_SYMBOL(ttm_bo_mem_compat);
1098
1099 int ttm_bo_validate(struct ttm_buffer_object *bo,
1100                         struct ttm_placement *placement,
1101                         bool interruptible,
1102                         bool no_wait_gpu)
1103 {
1104         int ret;
1105         uint32_t new_flags;
1106
1107         lockdep_assert_held(&bo->resv->lock.base);
1108         /*
1109          * Check whether we need to move buffer.
1110          */
1111         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1112                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1113                                          no_wait_gpu);
1114                 if (ret)
1115                         return ret;
1116         } else {
1117                 /*
1118                  * Use the access and other non-mapping-related flag bits from
1119                  * the compatible memory placement flags to the active flags
1120                  */
1121                 ttm_flag_masked(&bo->mem.placement, new_flags,
1122                                 ~TTM_PL_MASK_MEMTYPE);
1123         }
1124         /*
1125          * We might need to add a TTM.
1126          */
1127         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1128                 ret = ttm_bo_add_ttm(bo, true);
1129                 if (ret)
1130                         return ret;
1131         }
1132         return 0;
1133 }
1134 EXPORT_SYMBOL(ttm_bo_validate);
1135
1136 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1137                          struct ttm_buffer_object *bo,
1138                          unsigned long size,
1139                          enum ttm_bo_type type,
1140                          struct ttm_placement *placement,
1141                          uint32_t page_alignment,
1142                          bool interruptible,
1143                          struct file *persistent_swap_storage,
1144                          size_t acc_size,
1145                          struct sg_table *sg,
1146                          struct reservation_object *resv,
1147                          void (*destroy) (struct ttm_buffer_object *))
1148 {
1149         int ret = 0;
1150         unsigned long num_pages;
1151         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1152         bool locked;
1153
1154         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1155         if (ret) {
1156                 pr_err("Out of kernel memory\n");
1157                 if (destroy)
1158                         (*destroy)(bo);
1159                 else
1160                         kfree(bo);
1161                 return -ENOMEM;
1162         }
1163
1164         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1165         if (num_pages == 0) {
1166                 pr_err("Illegal buffer object size\n");
1167                 if (destroy)
1168                         (*destroy)(bo);
1169                 else
1170                         kfree(bo);
1171                 ttm_mem_global_free(mem_glob, acc_size);
1172                 return -EINVAL;
1173         }
1174         bo->destroy = destroy;
1175
1176         kref_init(&bo->kref);
1177         kref_init(&bo->list_kref);
1178         atomic_set(&bo->cpu_writers, 0);
1179         INIT_LIST_HEAD(&bo->lru);
1180         INIT_LIST_HEAD(&bo->ddestroy);
1181         INIT_LIST_HEAD(&bo->swap);
1182         INIT_LIST_HEAD(&bo->io_reserve_lru);
1183         mutex_init(&bo->wu_mutex);
1184         bo->bdev = bdev;
1185         bo->glob = bdev->glob;
1186         bo->type = type;
1187         bo->num_pages = num_pages;
1188         bo->mem.size = num_pages << PAGE_SHIFT;
1189         bo->mem.mem_type = TTM_PL_SYSTEM;
1190         bo->mem.num_pages = bo->num_pages;
1191         bo->mem.mm_node = NULL;
1192         bo->mem.page_alignment = page_alignment;
1193         bo->mem.bus.io_reserved_vm = false;
1194         bo->mem.bus.io_reserved_count = 0;
1195         bo->moving = NULL;
1196         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1197         bo->persistent_swap_storage = persistent_swap_storage;
1198         bo->acc_size = acc_size;
1199         bo->sg = sg;
1200         if (resv) {
1201                 bo->resv = resv;
1202                 lockdep_assert_held(&bo->resv->lock.base);
1203         } else {
1204                 bo->resv = &bo->ttm_resv;
1205         }
1206         reservation_object_init(&bo->ttm_resv);
1207         atomic_inc(&bo->glob->bo_count);
1208         drm_vma_node_reset(&bo->vma_node);
1209         bo->priority = 0;
1210
1211         /*
1212          * For ttm_bo_type_device buffers, allocate
1213          * address space from the device.
1214          */
1215         if (bo->type == ttm_bo_type_device ||
1216             bo->type == ttm_bo_type_sg)
1217                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1218                                          bo->mem.num_pages);
1219
1220         /* passed reservation objects should already be locked,
1221          * since otherwise lockdep will be angered in radeon.
1222          */
1223         if (!resv) {
1224                 locked = ww_mutex_trylock(&bo->resv->lock);
1225                 WARN_ON(!locked);
1226         }
1227
1228         if (likely(!ret))
1229                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1230
1231         if (unlikely(ret)) {
1232                 if (!resv)
1233                         ttm_bo_unreserve(bo);
1234
1235                 ttm_bo_unref(&bo);
1236                 return ret;
1237         }
1238
1239         if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1240                 spin_lock(&bo->glob->lru_lock);
1241                 ttm_bo_add_to_lru(bo);
1242                 spin_unlock(&bo->glob->lru_lock);
1243         }
1244
1245         return ret;
1246 }
1247 EXPORT_SYMBOL(ttm_bo_init_reserved);
1248
1249 int ttm_bo_init(struct ttm_bo_device *bdev,
1250                 struct ttm_buffer_object *bo,
1251                 unsigned long size,
1252                 enum ttm_bo_type type,
1253                 struct ttm_placement *placement,
1254                 uint32_t page_alignment,
1255                 bool interruptible,
1256                 struct file *persistent_swap_storage,
1257                 size_t acc_size,
1258                 struct sg_table *sg,
1259                 struct reservation_object *resv,
1260                 void (*destroy) (struct ttm_buffer_object *))
1261 {
1262         int ret;
1263
1264         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1265                                    page_alignment, interruptible,
1266                                    persistent_swap_storage, acc_size,
1267                                    sg, resv, destroy);
1268         if (ret)
1269                 return ret;
1270
1271         if (!resv)
1272                 ttm_bo_unreserve(bo);
1273
1274         return 0;
1275 }
1276 EXPORT_SYMBOL(ttm_bo_init);
1277
1278 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1279                        unsigned long bo_size,
1280                        unsigned struct_size)
1281 {
1282         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1283         size_t size = 0;
1284
1285         size += ttm_round_pot(struct_size);
1286         size += ttm_round_pot(npages * sizeof(void *));
1287         size += ttm_round_pot(sizeof(struct ttm_tt));
1288         return size;
1289 }
1290 EXPORT_SYMBOL(ttm_bo_acc_size);
1291
1292 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1293                            unsigned long bo_size,
1294                            unsigned struct_size)
1295 {
1296         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1297         size_t size = 0;
1298
1299         size += ttm_round_pot(struct_size);
1300         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1301         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1302         return size;
1303 }
1304 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1305
1306 int ttm_bo_create(struct ttm_bo_device *bdev,
1307                         unsigned long size,
1308                         enum ttm_bo_type type,
1309                         struct ttm_placement *placement,
1310                         uint32_t page_alignment,
1311                         bool interruptible,
1312                         struct file *persistent_swap_storage,
1313                         struct ttm_buffer_object **p_bo)
1314 {
1315         struct ttm_buffer_object *bo;
1316         size_t acc_size;
1317         int ret;
1318
1319         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1320         if (unlikely(bo == NULL))
1321                 return -ENOMEM;
1322
1323         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1324         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1325                           interruptible, persistent_swap_storage, acc_size,
1326                           NULL, NULL, NULL);
1327         if (likely(ret == 0))
1328                 *p_bo = bo;
1329
1330         return ret;
1331 }
1332 EXPORT_SYMBOL(ttm_bo_create);
1333
1334 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1335                                    unsigned mem_type)
1336 {
1337         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1338         struct ttm_bo_global *glob = bdev->glob;
1339         struct dma_fence *fence;
1340         int ret;
1341         unsigned i;
1342
1343         /*
1344          * Can't use standard list traversal since we're unlocking.
1345          */
1346
1347         spin_lock(&glob->lru_lock);
1348         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1349                 while (!list_empty(&man->lru[i])) {
1350                         spin_unlock(&glob->lru_lock);
1351                         ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1352                         if (ret)
1353                                 return ret;
1354                         spin_lock(&glob->lru_lock);
1355                 }
1356         }
1357         spin_unlock(&glob->lru_lock);
1358
1359         spin_lock(&man->move_lock);
1360         fence = dma_fence_get(man->move);
1361         spin_unlock(&man->move_lock);
1362
1363         if (fence) {
1364                 ret = dma_fence_wait(fence, false);
1365                 dma_fence_put(fence);
1366                 if (ret)
1367                         return ret;
1368         }
1369
1370         return 0;
1371 }
1372
1373 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1374 {
1375         struct ttm_mem_type_manager *man;
1376         int ret = -EINVAL;
1377
1378         if (mem_type >= TTM_NUM_MEM_TYPES) {
1379                 pr_err("Illegal memory type %d\n", mem_type);
1380                 return ret;
1381         }
1382         man = &bdev->man[mem_type];
1383
1384         if (!man->has_type) {
1385                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1386                        mem_type);
1387                 return ret;
1388         }
1389
1390         man->use_type = false;
1391         man->has_type = false;
1392
1393         ret = 0;
1394         if (mem_type > 0) {
1395                 ret = ttm_bo_force_list_clean(bdev, mem_type);
1396                 if (ret) {
1397                         pr_err("Cleanup eviction failed\n");
1398                         return ret;
1399                 }
1400
1401                 ret = (*man->func->takedown)(man);
1402         }
1403
1404         dma_fence_put(man->move);
1405         man->move = NULL;
1406
1407         return ret;
1408 }
1409 EXPORT_SYMBOL(ttm_bo_clean_mm);
1410
1411 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1412 {
1413         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1414
1415         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1416                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1417                 return -EINVAL;
1418         }
1419
1420         if (!man->has_type) {
1421                 pr_err("Memory type %u has not been initialized\n", mem_type);
1422                 return 0;
1423         }
1424
1425         return ttm_bo_force_list_clean(bdev, mem_type);
1426 }
1427 EXPORT_SYMBOL(ttm_bo_evict_mm);
1428
1429 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1430                         unsigned long p_size)
1431 {
1432         int ret;
1433         struct ttm_mem_type_manager *man;
1434         unsigned i;
1435
1436         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1437         man = &bdev->man[type];
1438         BUG_ON(man->has_type);
1439         man->io_reserve_fastpath = true;
1440         man->use_io_reserve_lru = false;
1441         mutex_init(&man->io_reserve_mutex);
1442         spin_lock_init(&man->move_lock);
1443         INIT_LIST_HEAD(&man->io_reserve_lru);
1444
1445         ret = bdev->driver->init_mem_type(bdev, type, man);
1446         if (ret)
1447                 return ret;
1448         man->bdev = bdev;
1449
1450         if (type != TTM_PL_SYSTEM) {
1451                 ret = (*man->func->init)(man, p_size);
1452                 if (ret)
1453                         return ret;
1454         }
1455         man->has_type = true;
1456         man->use_type = true;
1457         man->size = p_size;
1458
1459         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1460                 INIT_LIST_HEAD(&man->lru[i]);
1461         man->move = NULL;
1462
1463         return 0;
1464 }
1465 EXPORT_SYMBOL(ttm_bo_init_mm);
1466
1467 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1468 {
1469         struct ttm_bo_global *glob =
1470                 container_of(kobj, struct ttm_bo_global, kobj);
1471
1472         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1473         __free_page(glob->dummy_read_page);
1474         kfree(glob);
1475 }
1476
1477 void ttm_bo_global_release(struct drm_global_reference *ref)
1478 {
1479         struct ttm_bo_global *glob = ref->object;
1480
1481         kobject_del(&glob->kobj);
1482         kobject_put(&glob->kobj);
1483 }
1484 EXPORT_SYMBOL(ttm_bo_global_release);
1485
1486 int ttm_bo_global_init(struct drm_global_reference *ref)
1487 {
1488         struct ttm_bo_global_ref *bo_ref =
1489                 container_of(ref, struct ttm_bo_global_ref, ref);
1490         struct ttm_bo_global *glob = ref->object;
1491         int ret;
1492         unsigned i;
1493
1494         mutex_init(&glob->device_list_mutex);
1495         spin_lock_init(&glob->lru_lock);
1496         glob->mem_glob = bo_ref->mem_glob;
1497         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1498
1499         if (unlikely(glob->dummy_read_page == NULL)) {
1500                 ret = -ENOMEM;
1501                 goto out_no_drp;
1502         }
1503
1504         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1505                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1506         INIT_LIST_HEAD(&glob->device_list);
1507
1508         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1509         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1510         if (unlikely(ret != 0)) {
1511                 pr_err("Could not register buffer object swapout\n");
1512                 goto out_no_shrink;
1513         }
1514
1515         atomic_set(&glob->bo_count, 0);
1516
1517         ret = kobject_init_and_add(
1518                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1519         if (unlikely(ret != 0))
1520                 kobject_put(&glob->kobj);
1521         return ret;
1522 out_no_shrink:
1523         __free_page(glob->dummy_read_page);
1524 out_no_drp:
1525         kfree(glob);
1526         return ret;
1527 }
1528 EXPORT_SYMBOL(ttm_bo_global_init);
1529
1530
1531 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1532 {
1533         int ret = 0;
1534         unsigned i = TTM_NUM_MEM_TYPES;
1535         struct ttm_mem_type_manager *man;
1536         struct ttm_bo_global *glob = bdev->glob;
1537
1538         while (i--) {
1539                 man = &bdev->man[i];
1540                 if (man->has_type) {
1541                         man->use_type = false;
1542                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1543                                 ret = -EBUSY;
1544                                 pr_err("DRM memory manager type %d is not clean\n",
1545                                        i);
1546                         }
1547                         man->has_type = false;
1548                 }
1549         }
1550
1551         mutex_lock(&glob->device_list_mutex);
1552         list_del(&bdev->device_list);
1553         mutex_unlock(&glob->device_list_mutex);
1554
1555         cancel_delayed_work_sync(&bdev->wq);
1556
1557         while (ttm_bo_delayed_delete(bdev, true))
1558                 ;
1559
1560         spin_lock(&glob->lru_lock);
1561         if (list_empty(&bdev->ddestroy))
1562                 TTM_DEBUG("Delayed destroy list was clean\n");
1563
1564         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1565                 if (list_empty(&bdev->man[0].lru[0]))
1566                         TTM_DEBUG("Swap list %d was clean\n", i);
1567         spin_unlock(&glob->lru_lock);
1568
1569         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1570
1571         return ret;
1572 }
1573 EXPORT_SYMBOL(ttm_bo_device_release);
1574
1575 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1576                        struct ttm_bo_global *glob,
1577                        struct ttm_bo_driver *driver,
1578                        struct address_space *mapping,
1579                        uint64_t file_page_offset,
1580                        bool need_dma32)
1581 {
1582         int ret = -EINVAL;
1583
1584         bdev->driver = driver;
1585
1586         memset(bdev->man, 0, sizeof(bdev->man));
1587
1588         /*
1589          * Initialize the system memory buffer type.
1590          * Other types need to be driver / IOCTL initialized.
1591          */
1592         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1593         if (unlikely(ret != 0))
1594                 goto out_no_sys;
1595
1596         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1597                                     0x10000000);
1598         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1599         INIT_LIST_HEAD(&bdev->ddestroy);
1600         bdev->dev_mapping = mapping;
1601         bdev->glob = glob;
1602         bdev->need_dma32 = need_dma32;
1603         mutex_lock(&glob->device_list_mutex);
1604         list_add_tail(&bdev->device_list, &glob->device_list);
1605         mutex_unlock(&glob->device_list_mutex);
1606
1607         return 0;
1608 out_no_sys:
1609         return ret;
1610 }
1611 EXPORT_SYMBOL(ttm_bo_device_init);
1612
1613 /*
1614  * buffer object vm functions.
1615  */
1616
1617 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1618 {
1619         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1620
1621         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1622                 if (mem->mem_type == TTM_PL_SYSTEM)
1623                         return false;
1624
1625                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1626                         return false;
1627
1628                 if (mem->placement & TTM_PL_FLAG_CACHED)
1629                         return false;
1630         }
1631         return true;
1632 }
1633
1634 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1635 {
1636         struct ttm_bo_device *bdev = bo->bdev;
1637
1638         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1639         ttm_mem_io_free_vm(bo);
1640 }
1641
1642 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1643 {
1644         struct ttm_bo_device *bdev = bo->bdev;
1645         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1646
1647         ttm_mem_io_lock(man, false);
1648         ttm_bo_unmap_virtual_locked(bo);
1649         ttm_mem_io_unlock(man);
1650 }
1651
1652
1653 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1654
1655 int ttm_bo_wait(struct ttm_buffer_object *bo,
1656                 bool interruptible, bool no_wait)
1657 {
1658         long timeout = 15 * HZ;
1659
1660         if (no_wait) {
1661                 if (reservation_object_test_signaled_rcu(bo->resv, true))
1662                         return 0;
1663                 else
1664                         return -EBUSY;
1665         }
1666
1667         timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1668                                                       interruptible, timeout);
1669         if (timeout < 0)
1670                 return timeout;
1671
1672         if (timeout == 0)
1673                 return -EBUSY;
1674
1675         reservation_object_add_excl_fence(bo->resv, NULL);
1676         return 0;
1677 }
1678 EXPORT_SYMBOL(ttm_bo_wait);
1679
1680 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1681 {
1682         int ret = 0;
1683
1684         /*
1685          * Using ttm_bo_reserve makes sure the lru lists are updated.
1686          */
1687
1688         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1689         if (unlikely(ret != 0))
1690                 return ret;
1691         ret = ttm_bo_wait(bo, true, no_wait);
1692         if (likely(ret == 0))
1693                 atomic_inc(&bo->cpu_writers);
1694         ttm_bo_unreserve(bo);
1695         return ret;
1696 }
1697 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1698
1699 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1700 {
1701         atomic_dec(&bo->cpu_writers);
1702 }
1703 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1704
1705 /**
1706  * A buffer object shrink method that tries to swap out the first
1707  * buffer object on the bo_global::swap_lru list.
1708  */
1709
1710 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1711 {
1712         struct ttm_bo_global *glob =
1713             container_of(shrink, struct ttm_bo_global, shrink);
1714         struct ttm_buffer_object *bo;
1715         int ret = -EBUSY;
1716         unsigned i;
1717
1718         spin_lock(&glob->lru_lock);
1719         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1720                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1721                         ret = __ttm_bo_reserve(bo, false, true, NULL);
1722                         if (!ret)
1723                                 break;
1724                 }
1725                 if (!ret)
1726                         break;
1727         }
1728
1729         if (ret) {
1730                 spin_unlock(&glob->lru_lock);
1731                 return ret;
1732         }
1733
1734         kref_get(&bo->list_kref);
1735
1736         if (!list_empty(&bo->ddestroy)) {
1737                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1738                 kref_put(&bo->list_kref, ttm_bo_release_list);
1739                 return ret;
1740         }
1741
1742         ttm_bo_del_from_lru(bo);
1743         spin_unlock(&glob->lru_lock);
1744
1745         /**
1746          * Move to system cached
1747          */
1748
1749         if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1750             bo->ttm->caching_state != tt_cached) {
1751                 struct ttm_mem_reg evict_mem;
1752
1753                 evict_mem = bo->mem;
1754                 evict_mem.mm_node = NULL;
1755                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1756                 evict_mem.mem_type = TTM_PL_SYSTEM;
1757
1758                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1759                                              false, false);
1760                 if (unlikely(ret != 0))
1761                         goto out;
1762         }
1763
1764         /**
1765          * Make sure BO is idle.
1766          */
1767
1768         ret = ttm_bo_wait(bo, false, false);
1769         if (unlikely(ret != 0))
1770                 goto out;
1771
1772         ttm_bo_unmap_virtual(bo);
1773
1774         /**
1775          * Swap out. Buffer will be swapped in again as soon as
1776          * anyone tries to access a ttm page.
1777          */
1778
1779         if (bo->bdev->driver->swap_notify)
1780                 bo->bdev->driver->swap_notify(bo);
1781
1782         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1783 out:
1784
1785         /**
1786          *
1787          * Unreserve without putting on LRU to avoid swapping out an
1788          * already swapped buffer.
1789          */
1790
1791         __ttm_bo_unreserve(bo);
1792         kref_put(&bo->list_kref, ttm_bo_release_list);
1793         return ret;
1794 }
1795
1796 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1797 {
1798         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1799                 ;
1800 }
1801 EXPORT_SYMBOL(ttm_bo_swapout_all);
1802
1803 /**
1804  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1805  * unreserved
1806  *
1807  * @bo: Pointer to buffer
1808  */
1809 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1810 {
1811         int ret;
1812
1813         /*
1814          * In the absense of a wait_unlocked API,
1815          * Use the bo::wu_mutex to avoid triggering livelocks due to
1816          * concurrent use of this function. Note that this use of
1817          * bo::wu_mutex can go away if we change locking order to
1818          * mmap_sem -> bo::reserve.
1819          */
1820         ret = mutex_lock_interruptible(&bo->wu_mutex);
1821         if (unlikely(ret != 0))
1822                 return -ERESTARTSYS;
1823         if (!ww_mutex_is_locked(&bo->resv->lock))
1824                 goto out_unlock;
1825         ret = __ttm_bo_reserve(bo, true, false, NULL);
1826         if (unlikely(ret != 0))
1827                 goto out_unlock;
1828         __ttm_bo_unreserve(bo);
1829
1830 out_unlock:
1831         mutex_unlock(&bo->wu_mutex);
1832         return ret;
1833 }