drivers/gpu/drm/ttm/ttm_bo.c

   1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2 /**************************************************************************
   3  *
   4  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  25  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28 /*
  29  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  30  */
  31
  32 #define pr_fmt(fmt) "[TTM] " fmt
  33
  34 #include <drm/ttm/ttm_module.h>
  35 #include <drm/ttm/ttm_bo_driver.h>
  36 #include <drm/ttm/ttm_placement.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/slab.h>
  39 #include <linux/sched.h>
  40 #include <linux/mm.h>
  41 #include <linux/file.h>
  42 #include <linux/module.h>
  43 #include <linux/atomic.h>
  44 #include <linux/reservation.h>
  45
  46 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  47
  48 /**
  49  * ttm_global_mutex - protecting the global BO state
  50  */
  51 DEFINE_MUTEX(ttm_global_mutex);
  52 unsigned ttm_bo_glob_use_count;
  53 struct ttm_bo_global ttm_bo_glob;
  54
  55 static struct attribute ttm_bo_count = {
  56         .name = "bo_count",
  57         .mode = S_IRUGO
  58 };
  59
  60 /* default destructor */
  61 static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
  62 {
  63         kfree(bo);
  64 }
  65
  66 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
  67                                           uint32_t *mem_type)
  68 {
  69         int pos;
  70
  71         pos = ffs(place->flags & TTM_PL_MASK_MEM);
  72         if (unlikely(!pos))
  73                 return -EINVAL;
  74
  75         *mem_type = pos - 1;
  76         return 0;
  77 }
  78
  79 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p,
  80                                int mem_type)
  81 {
  82         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  83
  84         drm_printf(p, "    has_type: %d\n", man->has_type);
  85         drm_printf(p, "    use_type: %d\n", man->use_type);
  86         drm_printf(p, "    flags: 0x%08X\n", man->flags);
  87         drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
  88         drm_printf(p, "    size: %llu\n", man->size);
  89         drm_printf(p, "    available_caching: 0x%08X\n", man->available_caching);
  90         drm_printf(p, "    default_caching: 0x%08X\n", man->default_caching);
  91         if (mem_type != TTM_PL_SYSTEM)
  92                 (*man->func->debug)(man, p);
  93 }
  94
  95 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  96                                         struct ttm_placement *placement)
  97 {
  98         struct drm_printer p = drm_debug_printer(TTM_PFX);
  99         int i, ret, mem_type;
 100
 101         drm_printf(&p, "No space for %p (%lu pages, %luK, %luM)\n",
 102                    bo, bo->mem.num_pages, bo->mem.size >> 10,
 103                    bo->mem.size >> 20);
 104         for (i = 0; i < placement->num_placement; i++) {
 105                 ret = ttm_mem_type_from_place(&placement->placement[i],
 106                                                 &mem_type);
 107                 if (ret)
 108                         return;
 109                 drm_printf(&p, "  placement[%d]=0x%08X (%d)\n",
 110                            i, placement->placement[i].flags, mem_type);
 111                 ttm_mem_type_debug(bo->bdev, &p, mem_type);
 112         }
 113 }
 114
 115 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 116                                   struct attribute *attr,
 117                                   char *buffer)
 118 {
 119         struct ttm_bo_global *glob =
 120                 container_of(kobj, struct ttm_bo_global, kobj);
 121
 122         return snprintf(buffer, PAGE_SIZE, "%d\n",
 123                                 atomic_read(&glob->bo_count));
 124 }
 125
 126 static struct attribute *ttm_bo_global_attrs[] = {
 127         &ttm_bo_count,
 128         NULL
 129 };
 130
 131 static const struct sysfs_ops ttm_bo_global_ops = {
 132         .show = &ttm_bo_global_show
 133 };
 134
 135 static struct kobj_type ttm_bo_glob_kobj_type  = {
 136         .release = &ttm_bo_global_kobj_release,
 137         .sysfs_ops = &ttm_bo_global_ops,
 138         .default_attrs = ttm_bo_global_attrs
 139 };
 140
 141
 142 static inline uint32_t ttm_bo_type_flags(unsigned type)
 143 {
 144         return 1 << (type);
 145 }
 146
 147 static void ttm_bo_release_list(struct kref *list_kref)
 148 {
 149         struct ttm_buffer_object *bo =
 150             container_of(list_kref, struct ttm_buffer_object, list_kref);
 151         struct ttm_bo_device *bdev = bo->bdev;
 152         size_t acc_size = bo->acc_size;
 153
 154         BUG_ON(kref_read(&bo->list_kref));
 155         BUG_ON(kref_read(&bo->kref));
 156         BUG_ON(atomic_read(&bo->cpu_writers));
 157         BUG_ON(bo->mem.mm_node != NULL);
 158         BUG_ON(!list_empty(&bo->lru));
 159         BUG_ON(!list_empty(&bo->ddestroy));
 160         ttm_tt_destroy(bo->ttm);
 161         atomic_dec(&bo->bdev->glob->bo_count);
 162         dma_fence_put(bo->moving);
 163         reservation_object_fini(&bo->ttm_resv);
 164         mutex_destroy(&bo->wu_mutex);
 165         bo->destroy(bo);
 166         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 167 }
 168
 169 static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
 170                                   struct ttm_mem_reg *mem)
 171 {
 172         struct ttm_bo_device *bdev = bo->bdev;
 173         struct ttm_mem_type_manager *man;
 174
 175         reservation_object_assert_held(bo->resv);
 176
 177         if (!list_empty(&bo->lru))
 178                 return;
 179
 180         if (mem->placement & TTM_PL_FLAG_NO_EVICT)
 181                 return;
 182
 183         man = &bdev->man[mem->mem_type];
 184         list_add_tail(&bo->lru, &man->lru[bo->priority]);
 185         kref_get(&bo->list_kref);
 186
 187         if (bo->ttm && !(bo->ttm->page_flags &
 188                          (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED))) {
 189                 list_add_tail(&bo->swap, &bdev->glob->swap_lru[bo->priority]);
 190                 kref_get(&bo->list_kref);
 191         }
 192 }
 193
 194 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 195 {
 196         ttm_bo_add_mem_to_lru(bo, &bo->mem);
 197 }
 198 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 199
 200 static void ttm_bo_ref_bug(struct kref *list_kref)
 201 {
 202         BUG();
 203 }
 204
 205 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 206 {
 207         struct ttm_bo_device *bdev = bo->bdev;
 208         bool notify = false;
 209
 210         if (!list_empty(&bo->swap)) {
 211                 list_del_init(&bo->swap);
 212                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 213                 notify = true;
 214         }
 215         if (!list_empty(&bo->lru)) {
 216                 list_del_init(&bo->lru);
 217                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 218                 notify = true;
 219         }
 220
 221         if (notify && bdev->driver->del_from_lru_notify)
 222                 bdev->driver->del_from_lru_notify(bo);
 223 }
 224
 225 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 226 {
 227         struct ttm_bo_global *glob = bo->bdev->glob;
 228
 229         spin_lock(&glob->lru_lock);
 230         ttm_bo_del_from_lru(bo);
 231         spin_unlock(&glob->lru_lock);
 232 }
 233 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 234
 235 static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
 236                                      struct ttm_buffer_object *bo)
 237 {
 238         if (!pos->first)
 239                 pos->first = bo;
 240         pos->last = bo;
 241 }
 242
 243 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 244                              struct ttm_lru_bulk_move *bulk)
 245 {
 246         reservation_object_assert_held(bo->resv);
 247
 248         ttm_bo_del_from_lru(bo);
 249         ttm_bo_add_to_lru(bo);
 250
 251         if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 252                 switch (bo->mem.mem_type) {
 253                 case TTM_PL_TT:
 254                         ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
 255                         break;
 256
 257                 case TTM_PL_VRAM:
 258                         ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
 259                         break;
 260                 }
 261                 if (bo->ttm && !(bo->ttm->page_flags &
 262                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
 263                         ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
 264         }
 265 }
 266 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 267
 268 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
 269 {
 270         unsigned i;
 271
 272         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 273                 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
 274                 struct ttm_mem_type_manager *man;
 275
 276                 if (!pos->first)
 277                         continue;
 278
 279                 reservation_object_assert_held(pos->first->resv);
 280                 reservation_object_assert_held(pos->last->resv);
 281
 282                 man = &pos->first->bdev->man[TTM_PL_TT];
 283                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 284                                     &pos->last->lru);
 285         }
 286
 287         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 288                 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
 289                 struct ttm_mem_type_manager *man;
 290
 291                 if (!pos->first)
 292                         continue;
 293
 294                 reservation_object_assert_held(pos->first->resv);
 295                 reservation_object_assert_held(pos->last->resv);
 296
 297                 man = &pos->first->bdev->man[TTM_PL_VRAM];
 298                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 299                                     &pos->last->lru);
 300         }
 301
 302         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 303                 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
 304                 struct list_head *lru;
 305
 306                 if (!pos->first)
 307                         continue;
 308
 309                 reservation_object_assert_held(pos->first->resv);
 310                 reservation_object_assert_held(pos->last->resv);
 311
 312                 lru = &pos->first->bdev->glob->swap_lru[i];
 313                 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
 314         }
 315 }
 316 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
 317
 318 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 319                                   struct ttm_mem_reg *mem, bool evict,
 320                                   struct ttm_operation_ctx *ctx)
 321 {
 322         struct ttm_bo_device *bdev = bo->bdev;
 323         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 324         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 325         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 326         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 327         int ret = 0;
 328
 329         if (old_is_pci || new_is_pci ||
 330             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 331                 ret = ttm_mem_io_lock(old_man, true);
 332                 if (unlikely(ret != 0))
 333                         goto out_err;
 334                 ttm_bo_unmap_virtual_locked(bo);
 335                 ttm_mem_io_unlock(old_man);
 336         }
 337
 338         /*
 339          * Create and bind a ttm if required.
 340          */
 341
 342         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 343                 if (bo->ttm == NULL) {
 344                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 345                         ret = ttm_tt_create(bo, zero);
 346                         if (ret)
 347                                 goto out_err;
 348                 }
 349
 350                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 351                 if (ret)
 352                         goto out_err;
 353
 354                 if (mem->mem_type != TTM_PL_SYSTEM) {
 355                         ret = ttm_tt_bind(bo->ttm, mem, ctx);
 356                         if (ret)
 357                                 goto out_err;
 358                 }
 359
 360                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 361                         if (bdev->driver->move_notify)
 362                                 bdev->driver->move_notify(bo, evict, mem);
 363                         bo->mem = *mem;
 364                         mem->mm_node = NULL;
 365                         goto moved;
 366                 }
 367         }
 368
 369         if (bdev->driver->move_notify)
 370                 bdev->driver->move_notify(bo, evict, mem);
 371
 372         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 373             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 374                 ret = ttm_bo_move_ttm(bo, ctx, mem);
 375         else if (bdev->driver->move)
 376                 ret = bdev->driver->move(bo, evict, ctx, mem);
 377         else
 378                 ret = ttm_bo_move_memcpy(bo, ctx, mem);
 379
 380         if (ret) {
 381                 if (bdev->driver->move_notify) {
 382                         swap(*mem, bo->mem);
 383                         bdev->driver->move_notify(bo, false, mem);
 384                         swap(*mem, bo->mem);
 385                 }
 386
 387                 goto out_err;
 388         }
 389
 390 moved:
 391         if (bo->evicted) {
 392                 if (bdev->driver->invalidate_caches) {
 393                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 394                         if (ret)
 395                                 pr_err("Can not flush read caches\n");
 396                 }
 397                 bo->evicted = false;
 398         }
 399
 400         if (bo->mem.mm_node)
 401                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 402                     bdev->man[bo->mem.mem_type].gpu_offset;
 403         else
 404                 bo->offset = 0;
 405
 406         ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
 407         return 0;
 408
 409 out_err:
 410         new_man = &bdev->man[bo->mem.mem_type];
 411         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 412                 ttm_tt_destroy(bo->ttm);
 413                 bo->ttm = NULL;
 414         }
 415
 416         return ret;
 417 }
 418
 419 /**
 420  * Call bo::reserved.
 421  * Will release GPU memory type usage on destruction.
 422  * This is the place to put in driver specific hooks to release
 423  * driver private resources.
 424  * Will release the bo::reserved lock.
 425  */
 426
 427 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 428 {
 429         if (bo->bdev->driver->move_notify)
 430                 bo->bdev->driver->move_notify(bo, false, NULL);
 431
 432         ttm_tt_destroy(bo->ttm);
 433         bo->ttm = NULL;
 434         ttm_bo_mem_put(bo, &bo->mem);
 435 }
 436
 437 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 438 {
 439         int r;
 440
 441         if (bo->resv == &bo->ttm_resv)
 442                 return 0;
 443
 444         BUG_ON(!reservation_object_trylock(&bo->ttm_resv));
 445
 446         r = reservation_object_copy_fences(&bo->ttm_resv, bo->resv);
 447         if (r)
 448                 reservation_object_unlock(&bo->ttm_resv);
 449
 450         return r;
 451 }
 452
 453 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 454 {
 455         struct reservation_object_list *fobj;
 456         struct dma_fence *fence;
 457         int i;
 458
 459         fobj = reservation_object_get_list(&bo->ttm_resv);
 460         fence = reservation_object_get_excl(&bo->ttm_resv);
 461         if (fence && !fence->ops->signaled)
 462                 dma_fence_enable_sw_signaling(fence);
 463
 464         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 465                 fence = rcu_dereference_protected(fobj->shared[i],
 466                                         reservation_object_held(bo->resv));
 467
 468                 if (!fence->ops->signaled)
 469                         dma_fence_enable_sw_signaling(fence);
 470         }
 471 }
 472
 473 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 474 {
 475         struct ttm_bo_device *bdev = bo->bdev;
 476         struct ttm_bo_global *glob = bdev->glob;
 477         int ret;
 478
 479         ret = ttm_bo_individualize_resv(bo);
 480         if (ret) {
 481                 /* Last resort, if we fail to allocate memory for the
 482                  * fences block for the BO to become idle
 483                  */
 484                 reservation_object_wait_timeout_rcu(bo->resv, true, false,
 485                                                     30 * HZ);
 486                 spin_lock(&glob->lru_lock);
 487                 goto error;
 488         }
 489
 490         spin_lock(&glob->lru_lock);
 491         ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
 492         if (!ret) {
 493                 if (reservation_object_test_signaled_rcu(&bo->ttm_resv, true)) {
 494                         ttm_bo_del_from_lru(bo);
 495                         spin_unlock(&glob->lru_lock);
 496                         if (bo->resv != &bo->ttm_resv)
 497                                 reservation_object_unlock(&bo->ttm_resv);
 498
 499                         ttm_bo_cleanup_memtype_use(bo);
 500                         reservation_object_unlock(bo->resv);
 501                         return;
 502                 }
 503
 504                 ttm_bo_flush_all_fences(bo);
 505
 506                 /*
 507                  * Make NO_EVICT bos immediately available to
 508                  * shrinkers, now that they are queued for
 509                  * destruction.
 510                  */
 511                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 512                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 513                         ttm_bo_add_to_lru(bo);
 514                 }
 515
 516                 reservation_object_unlock(bo->resv);
 517         }
 518         if (bo->resv != &bo->ttm_resv)
 519                 reservation_object_unlock(&bo->ttm_resv);
 520
 521 error:
 522         kref_get(&bo->list_kref);
 523         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 524         spin_unlock(&glob->lru_lock);
 525
 526         schedule_delayed_work(&bdev->wq,
 527                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 528 }
 529
 530 /**
 531  * function ttm_bo_cleanup_refs
 532  * If bo idle, remove from delayed- and lru lists, and unref.
 533  * If not idle, do nothing.
 534  *
 535  * Must be called with lru_lock and reservation held, this function
 536  * will drop the lru lock and optionally the reservation lock before returning.
 537  *
 538  * @interruptible         Any sleeps should occur interruptibly.
 539  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 540  * @unlock_resv           Unlock the reservation lock as well.
 541  */
 542
 543 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 544                                bool interruptible, bool no_wait_gpu,
 545                                bool unlock_resv)
 546 {
 547         struct ttm_bo_global *glob = bo->bdev->glob;
 548         struct reservation_object *resv;
 549         int ret;
 550
 551         if (unlikely(list_empty(&bo->ddestroy)))
 552                 resv = bo->resv;
 553         else
 554                 resv = &bo->ttm_resv;
 555
 556         if (reservation_object_test_signaled_rcu(resv, true))
 557                 ret = 0;
 558         else
 559                 ret = -EBUSY;
 560
 561         if (ret && !no_wait_gpu) {
 562                 long lret;
 563
 564                 if (unlock_resv)
 565                         reservation_object_unlock(bo->resv);
 566                 spin_unlock(&glob->lru_lock);
 567
 568                 lret = reservation_object_wait_timeout_rcu(resv, true,
 569                                                            interruptible,
 570                                                            30 * HZ);
 571
 572                 if (lret < 0)
 573                         return lret;
 574                 else if (lret == 0)
 575                         return -EBUSY;
 576
 577                 spin_lock(&glob->lru_lock);
 578                 if (unlock_resv && !reservation_object_trylock(bo->resv)) {
 579                         /*
 580                          * We raced, and lost, someone else holds the reservation now,
 581                          * and is probably busy in ttm_bo_cleanup_memtype_use.
 582                          *
 583                          * Even if it's not the case, because we finished waiting any
 584                          * delayed destruction would succeed, so just return success
 585                          * here.
 586                          */
 587                         spin_unlock(&glob->lru_lock);
 588                         return 0;
 589                 }
 590                 ret = 0;
 591         }
 592
 593         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 594                 if (unlock_resv)
 595                         reservation_object_unlock(bo->resv);
 596                 spin_unlock(&glob->lru_lock);
 597                 return ret;
 598         }
 599
 600         ttm_bo_del_from_lru(bo);
 601         list_del_init(&bo->ddestroy);
 602         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 603
 604         spin_unlock(&glob->lru_lock);
 605         ttm_bo_cleanup_memtype_use(bo);
 606
 607         if (unlock_resv)
 608                 reservation_object_unlock(bo->resv);
 609
 610         return 0;
 611 }
 612
 613 /**
 614  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 615  * encountered buffers.
 616  */
 617 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 618 {
 619         struct ttm_bo_global *glob = bdev->glob;
 620         struct list_head removed;
 621         bool empty;
 622
 623         INIT_LIST_HEAD(&removed);
 624
 625         spin_lock(&glob->lru_lock);
 626         while (!list_empty(&bdev->ddestroy)) {
 627                 struct ttm_buffer_object *bo;
 628
 629                 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
 630                                       ddestroy);
 631                 kref_get(&bo->list_kref);
 632                 list_move_tail(&bo->ddestroy, &removed);
 633
 634                 if (remove_all || bo->resv != &bo->ttm_resv) {
 635                         spin_unlock(&glob->lru_lock);
 636                         reservation_object_lock(bo->resv, NULL);
 637
 638                         spin_lock(&glob->lru_lock);
 639                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 640
 641                 } else if (reservation_object_trylock(bo->resv)) {
 642                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 643                 } else {
 644                         spin_unlock(&glob->lru_lock);
 645                 }
 646
 647                 kref_put(&bo->list_kref, ttm_bo_release_list);
 648                 spin_lock(&glob->lru_lock);
 649         }
 650         list_splice_tail(&removed, &bdev->ddestroy);
 651         empty = list_empty(&bdev->ddestroy);
 652         spin_unlock(&glob->lru_lock);
 653
 654         return empty;
 655 }
 656
 657 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 658 {
 659         struct ttm_bo_device *bdev =
 660             container_of(work, struct ttm_bo_device, wq.work);
 661
 662         if (!ttm_bo_delayed_delete(bdev, false))
 663                 schedule_delayed_work(&bdev->wq,
 664                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 665 }
 666
 667 static void ttm_bo_release(struct kref *kref)
 668 {
 669         struct ttm_buffer_object *bo =
 670             container_of(kref, struct ttm_buffer_object, kref);
 671         struct ttm_bo_device *bdev = bo->bdev;
 672         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 673
 674         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 675         ttm_mem_io_lock(man, false);
 676         ttm_mem_io_free_vm(bo);
 677         ttm_mem_io_unlock(man);
 678         ttm_bo_cleanup_refs_or_queue(bo);
 679         kref_put(&bo->list_kref, ttm_bo_release_list);
 680 }
 681
 682 void ttm_bo_put(struct ttm_buffer_object *bo)
 683 {
 684         kref_put(&bo->kref, ttm_bo_release);
 685 }
 686 EXPORT_SYMBOL(ttm_bo_put);
 687
 688 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 689 {
 690         return cancel_delayed_work_sync(&bdev->wq);
 691 }
 692 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 693
 694 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 695 {
 696         if (resched)
 697                 schedule_delayed_work(&bdev->wq,
 698                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 699 }
 700 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 701
 702 static int ttm_bo_evict(struct ttm_buffer_object *bo,
 703                         struct ttm_operation_ctx *ctx)
 704 {
 705         struct ttm_bo_device *bdev = bo->bdev;
 706         struct ttm_mem_reg evict_mem;
 707         struct ttm_placement placement;
 708         int ret = 0;
 709
 710         reservation_object_assert_held(bo->resv);
 711
 712         placement.num_placement = 0;
 713         placement.num_busy_placement = 0;
 714         bdev->driver->evict_flags(bo, &placement);
 715
 716         if (!placement.num_placement && !placement.num_busy_placement) {
 717                 ret = ttm_bo_pipeline_gutting(bo);
 718                 if (ret)
 719                         return ret;
 720
 721                 return ttm_tt_create(bo, false);
 722         }
 723
 724         evict_mem = bo->mem;
 725         evict_mem.mm_node = NULL;
 726         evict_mem.bus.io_reserved_vm = false;
 727         evict_mem.bus.io_reserved_count = 0;
 728
 729         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 730         if (ret) {
 731                 if (ret != -ERESTARTSYS) {
 732                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 733                                bo);
 734                         ttm_bo_mem_space_debug(bo, &placement);
 735                 }
 736                 goto out;
 737         }
 738
 739         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
 740         if (unlikely(ret)) {
 741                 if (ret != -ERESTARTSYS)
 742                         pr_err("Buffer eviction failed\n");
 743                 ttm_bo_mem_put(bo, &evict_mem);
 744                 goto out;
 745         }
 746         bo->evicted = true;
 747 out:
 748         return ret;
 749 }
 750
 751 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 752                               const struct ttm_place *place)
 753 {
 754         /* Don't evict this BO if it's outside of the
 755          * requested placement range
 756          */
 757         if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 758             (place->lpfn && place->lpfn <= bo->mem.start))
 759                 return false;
 760
 761         return true;
 762 }
 763 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 764
 765 /**
 766  * Check the target bo is allowable to be evicted or swapout, including cases:
 767  *
 768  * a. if share same reservation object with ctx->resv, have assumption
 769  * reservation objects should already be locked, so not lock again and
 770  * return true directly when either the opreation allow_reserved_eviction
 771  * or the target bo already is in delayed free list;
 772  *
 773  * b. Otherwise, trylock it.
 774  */
 775 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 776                         struct ttm_operation_ctx *ctx, bool *locked)
 777 {
 778         bool ret = false;
 779
 780         *locked = false;
 781         if (bo->resv == ctx->resv) {
 782                 reservation_object_assert_held(bo->resv);
 783                 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT
 784                     || !list_empty(&bo->ddestroy))
 785                         ret = true;
 786         } else {
 787                 *locked = reservation_object_trylock(bo->resv);
 788                 ret = *locked;
 789         }
 790
 791         return ret;
 792 }
 793
 794 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 795                                uint32_t mem_type,
 796                                const struct ttm_place *place,
 797                                struct ttm_operation_ctx *ctx)
 798 {
 799         struct ttm_bo_global *glob = bdev->glob;
 800         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 801         struct ttm_buffer_object *bo = NULL;
 802         bool locked = false;
 803         unsigned i;
 804         int ret;
 805
 806         spin_lock(&glob->lru_lock);
 807         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 808                 list_for_each_entry(bo, &man->lru[i], lru) {
 809                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked))
 810                                 continue;
 811
 812                         if (place && !bdev->driver->eviction_valuable(bo,
 813                                                                       place)) {
 814                                 if (locked)
 815                                         reservation_object_unlock(bo->resv);
 816                                 continue;
 817                         }
 818                         break;
 819                 }
 820
 821                 /* If the inner loop terminated early, we have our candidate */
 822                 if (&bo->lru != &man->lru[i])
 823                         break;
 824
 825                 bo = NULL;
 826         }
 827
 828         if (!bo) {
 829                 spin_unlock(&glob->lru_lock);
 830                 return -EBUSY;
 831         }
 832
 833         kref_get(&bo->list_kref);
 834
 835         if (!list_empty(&bo->ddestroy)) {
 836                 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
 837                                           ctx->no_wait_gpu, locked);
 838                 kref_put(&bo->list_kref, ttm_bo_release_list);
 839                 return ret;
 840         }
 841
 842         ttm_bo_del_from_lru(bo);
 843         spin_unlock(&glob->lru_lock);
 844
 845         ret = ttm_bo_evict(bo, ctx);
 846         if (locked) {
 847                 ttm_bo_unreserve(bo);
 848         } else {
 849                 spin_lock(&glob->lru_lock);
 850                 ttm_bo_add_to_lru(bo);
 851                 spin_unlock(&glob->lru_lock);
 852         }
 853
 854         kref_put(&bo->list_kref, ttm_bo_release_list);
 855         return ret;
 856 }
 857
 858 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 859 {
 860         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 861
 862         if (mem->mm_node)
 863                 (*man->func->put_node)(man, mem);
 864 }
 865 EXPORT_SYMBOL(ttm_bo_mem_put);
 866
 867 /**
 868  * Add the last move fence to the BO and reserve a new shared slot.
 869  */
 870 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 871                                  struct ttm_mem_type_manager *man,
 872                                  struct ttm_mem_reg *mem)
 873 {
 874         struct dma_fence *fence;
 875         int ret;
 876
 877         spin_lock(&man->move_lock);
 878         fence = dma_fence_get(man->move);
 879         spin_unlock(&man->move_lock);
 880
 881         if (fence) {
 882                 reservation_object_add_shared_fence(bo->resv, fence);
 883
 884                 ret = reservation_object_reserve_shared(bo->resv, 1);
 885                 if (unlikely(ret)) {
 886                         dma_fence_put(fence);
 887                         return ret;
 888                 }
 889
 890                 dma_fence_put(bo->moving);
 891                 bo->moving = fence;
 892         }
 893
 894         return 0;
 895 }
 896
 897 /**
 898  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 899  * space, or we've evicted everything and there isn't enough space.
 900  */
 901 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 902                                   const struct ttm_place *place,
 903                                   struct ttm_mem_reg *mem,
 904                                   struct ttm_operation_ctx *ctx)
 905 {
 906         struct ttm_bo_device *bdev = bo->bdev;
 907         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 908         int ret;
 909
 910         do {
 911                 ret = (*man->func->get_node)(man, bo, place, mem);
 912                 if (unlikely(ret != 0))
 913                         return ret;
 914                 if (mem->mm_node)
 915                         break;
 916                 ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx);
 917                 if (unlikely(ret != 0))
 918                         return ret;
 919         } while (1);
 920
 921         return ttm_bo_add_move_fence(bo, man, mem);
 922 }
 923
 924 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 925                                       uint32_t cur_placement,
 926                                       uint32_t proposed_placement)
 927 {
 928         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 929         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 930
 931         /**
 932          * Keep current caching if possible.
 933          */
 934
 935         if ((cur_placement & caching) != 0)
 936                 result |= (cur_placement & caching);
 937         else if ((man->default_caching & caching) != 0)
 938                 result |= man->default_caching;
 939         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 940                 result |= TTM_PL_FLAG_CACHED;
 941         else if ((TTM_PL_FLAG_WC & caching) != 0)
 942                 result |= TTM_PL_FLAG_WC;
 943         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 944                 result |= TTM_PL_FLAG_UNCACHED;
 945
 946         return result;
 947 }
 948
 949 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 950                                  uint32_t mem_type,
 951                                  const struct ttm_place *place,
 952                                  uint32_t *masked_placement)
 953 {
 954         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 955
 956         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 957                 return false;
 958
 959         if ((place->flags & man->available_caching) == 0)
 960                 return false;
 961
 962         cur_flags |= (place->flags & man->available_caching);
 963
 964         *masked_placement = cur_flags;
 965         return true;
 966 }
 967
 968 /**
 969  * ttm_bo_mem_placement - check if placement is compatible
 970  * @bo: BO to find memory for
 971  * @place: where to search
 972  * @mem: the memory object to fill in
 973  * @ctx: operation context
 974  *
 975  * Check if placement is compatible and fill in mem structure.
 976  * Returns -EBUSY if placement won't work or negative error code.
 977  * 0 when placement can be used.
 978  */
 979 static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
 980                                 const struct ttm_place *place,
 981                                 struct ttm_mem_reg *mem,
 982                                 struct ttm_operation_ctx *ctx)
 983 {
 984         struct ttm_bo_device *bdev = bo->bdev;
 985         uint32_t mem_type = TTM_PL_SYSTEM;
 986         struct ttm_mem_type_manager *man;
 987         uint32_t cur_flags = 0;
 988         int ret;
 989
 990         ret = ttm_mem_type_from_place(place, &mem_type);
 991         if (ret)
 992                 return ret;
 993
 994         man = &bdev->man[mem_type];
 995         if (!man->has_type || !man->use_type)
 996                 return -EBUSY;
 997
 998         if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 999                 return -EBUSY;
1000
1001         cur_flags = ttm_bo_select_caching(man, bo->mem.placement, cur_flags);
1002         /*
1003          * Use the access and other non-mapping-related flag bits from
1004          * the memory placement flags to the current flags
1005          */
1006         ttm_flag_masked(&cur_flags, place->flags, ~TTM_PL_MASK_MEMTYPE);
1007
1008         mem->mem_type = mem_type;
1009         mem->placement = cur_flags;
1010
1011         if (bo->mem.mem_type < mem_type && !list_empty(&bo->lru)) {
1012                 spin_lock(&bo->bdev->glob->lru_lock);
1013                 ttm_bo_del_from_lru(bo);
1014                 ttm_bo_add_mem_to_lru(bo, mem);
1015                 spin_unlock(&bo->bdev->glob->lru_lock);
1016         }
1017
1018         return 0;
1019 }
1020
1021 /**
1022  * Creates space for memory region @mem according to its type.
1023  *
1024  * This function first searches for free space in compatible memory types in
1025  * the priority order defined by the driver.  If free space isn't found, then
1026  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1027  * space.
1028  */
1029 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1030                         struct ttm_placement *placement,
1031                         struct ttm_mem_reg *mem,
1032                         struct ttm_operation_ctx *ctx)
1033 {
1034         struct ttm_bo_device *bdev = bo->bdev;
1035         bool type_found = false;
1036         int i, ret;
1037
1038         ret = reservation_object_reserve_shared(bo->resv, 1);
1039         if (unlikely(ret))
1040                 return ret;
1041
1042         mem->mm_node = NULL;
1043         for (i = 0; i < placement->num_placement; ++i) {
1044                 const struct ttm_place *place = &placement->placement[i];
1045                 struct ttm_mem_type_manager *man;
1046
1047                 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1048                 if (ret == -EBUSY)
1049                         continue;
1050                 if (ret)
1051                         goto error;
1052
1053                 type_found = true;
1054                 mem->mm_node = NULL;
1055                 if (mem->mem_type == TTM_PL_SYSTEM)
1056                         return 0;
1057
1058                 man = &bdev->man[mem->mem_type];
1059                 ret = (*man->func->get_node)(man, bo, place, mem);
1060                 if (unlikely(ret))
1061                         goto error;
1062
1063                 if (mem->mm_node) {
1064                         ret = ttm_bo_add_move_fence(bo, man, mem);
1065                         if (unlikely(ret)) {
1066                                 (*man->func->put_node)(man, mem);
1067                                 goto error;
1068                         }
1069                         return 0;
1070                 }
1071         }
1072
1073         for (i = 0; i < placement->num_busy_placement; ++i) {
1074                 const struct ttm_place *place = &placement->busy_placement[i];
1075
1076                 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1077                 if (ret == -EBUSY)
1078                         continue;
1079                 if (ret)
1080                         goto error;
1081
1082                 type_found = true;
1083                 mem->mm_node = NULL;
1084                 if (mem->mem_type == TTM_PL_SYSTEM)
1085                         return 0;
1086
1087                 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
1088                 if (ret == 0 && mem->mm_node)
1089                         return 0;
1090
1091                 if (ret && ret != -EBUSY)
1092                         goto error;
1093         }
1094
1095         ret = -ENOMEM;
1096         if (!type_found) {
1097                 pr_err(TTM_PFX "No compatible memory type found\n");
1098                 ret = -EINVAL;
1099         }
1100
1101 error:
1102         if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
1103                 spin_lock(&bo->bdev->glob->lru_lock);
1104                 ttm_bo_move_to_lru_tail(bo, NULL);
1105                 spin_unlock(&bo->bdev->glob->lru_lock);
1106         }
1107
1108         return ret;
1109 }
1110 EXPORT_SYMBOL(ttm_bo_mem_space);
1111
1112 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1113                               struct ttm_placement *placement,
1114                               struct ttm_operation_ctx *ctx)
1115 {
1116         int ret = 0;
1117         struct ttm_mem_reg mem;
1118
1119         reservation_object_assert_held(bo->resv);
1120
1121         mem.num_pages = bo->num_pages;
1122         mem.size = mem.num_pages << PAGE_SHIFT;
1123         mem.page_alignment = bo->mem.page_alignment;
1124         mem.bus.io_reserved_vm = false;
1125         mem.bus.io_reserved_count = 0;
1126         /*
1127          * Determine where to move the buffer.
1128          */
1129         ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1130         if (ret)
1131                 goto out_unlock;
1132         ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1133 out_unlock:
1134         if (ret && mem.mm_node)
1135                 ttm_bo_mem_put(bo, &mem);
1136         return ret;
1137 }
1138
1139 static bool ttm_bo_places_compat(const struct ttm_place *places,
1140                                  unsigned num_placement,
1141                                  struct ttm_mem_reg *mem,
1142                                  uint32_t *new_flags)
1143 {
1144         unsigned i;
1145
1146         for (i = 0; i < num_placement; i++) {
1147                 const struct ttm_place *heap = &places[i];
1148
1149                 if (mem->mm_node && (mem->start < heap->fpfn ||
1150                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1151                         continue;
1152
1153                 *new_flags = heap->flags;
1154                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1155                     (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1156                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1157                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1158                         return true;
1159         }
1160         return false;
1161 }
1162
1163 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1164                        struct ttm_mem_reg *mem,
1165                        uint32_t *new_flags)
1166 {
1167         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1168                                  mem, new_flags))
1169                 return true;
1170
1171         if ((placement->busy_placement != placement->placement ||
1172              placement->num_busy_placement > placement->num_placement) &&
1173             ttm_bo_places_compat(placement->busy_placement,
1174                                  placement->num_busy_placement,
1175                                  mem, new_flags))
1176                 return true;
1177
1178         return false;
1179 }
1180 EXPORT_SYMBOL(ttm_bo_mem_compat);
1181
1182 int ttm_bo_validate(struct ttm_buffer_object *bo,
1183                     struct ttm_placement *placement,
1184                     struct ttm_operation_ctx *ctx)
1185 {
1186         int ret;
1187         uint32_t new_flags;
1188
1189         reservation_object_assert_held(bo->resv);
1190         /*
1191          * Check whether we need to move buffer.
1192          */
1193         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1194                 ret = ttm_bo_move_buffer(bo, placement, ctx);
1195                 if (ret)
1196                         return ret;
1197         } else {
1198                 /*
1199                  * Use the access and other non-mapping-related flag bits from
1200                  * the compatible memory placement flags to the active flags
1201                  */
1202                 ttm_flag_masked(&bo->mem.placement, new_flags,
1203                                 ~TTM_PL_MASK_MEMTYPE);
1204         }
1205         /*
1206          * We might need to add a TTM.
1207          */
1208         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1209                 ret = ttm_tt_create(bo, true);
1210                 if (ret)
1211                         return ret;
1212         }
1213         return 0;
1214 }
1215 EXPORT_SYMBOL(ttm_bo_validate);
1216
1217 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1218                          struct ttm_buffer_object *bo,
1219                          unsigned long size,
1220                          enum ttm_bo_type type,
1221                          struct ttm_placement *placement,
1222                          uint32_t page_alignment,
1223                          struct ttm_operation_ctx *ctx,
1224                          size_t acc_size,
1225                          struct sg_table *sg,
1226                          struct reservation_object *resv,
1227                          void (*destroy) (struct ttm_buffer_object *))
1228 {
1229         int ret = 0;
1230         unsigned long num_pages;
1231         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1232         bool locked;
1233
1234         ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1235         if (ret) {
1236                 pr_err("Out of kernel memory\n");
1237                 if (destroy)
1238                         (*destroy)(bo);
1239                 else
1240                         kfree(bo);
1241                 return -ENOMEM;
1242         }
1243
1244         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1245         if (num_pages == 0) {
1246                 pr_err("Illegal buffer object size\n");
1247                 if (destroy)
1248                         (*destroy)(bo);
1249                 else
1250                         kfree(bo);
1251                 ttm_mem_global_free(mem_glob, acc_size);
1252                 return -EINVAL;
1253         }
1254         bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1255
1256         kref_init(&bo->kref);
1257         kref_init(&bo->list_kref);
1258         atomic_set(&bo->cpu_writers, 0);
1259         INIT_LIST_HEAD(&bo->lru);
1260         INIT_LIST_HEAD(&bo->ddestroy);
1261         INIT_LIST_HEAD(&bo->swap);
1262         INIT_LIST_HEAD(&bo->io_reserve_lru);
1263         mutex_init(&bo->wu_mutex);
1264         bo->bdev = bdev;
1265         bo->type = type;
1266         bo->num_pages = num_pages;
1267         bo->mem.size = num_pages << PAGE_SHIFT;
1268         bo->mem.mem_type = TTM_PL_SYSTEM;
1269         bo->mem.num_pages = bo->num_pages;
1270         bo->mem.mm_node = NULL;
1271         bo->mem.page_alignment = page_alignment;
1272         bo->mem.bus.io_reserved_vm = false;
1273         bo->mem.bus.io_reserved_count = 0;
1274         bo->moving = NULL;
1275         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1276         bo->acc_size = acc_size;
1277         bo->sg = sg;
1278         if (resv) {
1279                 bo->resv = resv;
1280                 reservation_object_assert_held(bo->resv);
1281         } else {
1282                 bo->resv = &bo->ttm_resv;
1283         }
1284         reservation_object_init(&bo->ttm_resv);
1285         atomic_inc(&bo->bdev->glob->bo_count);
1286         drm_vma_node_reset(&bo->vma_node);
1287
1288         /*
1289          * For ttm_bo_type_device buffers, allocate
1290          * address space from the device.
1291          */
1292         if (bo->type == ttm_bo_type_device ||
1293             bo->type == ttm_bo_type_sg)
1294                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1295                                          bo->mem.num_pages);
1296
1297         /* passed reservation objects should already be locked,
1298          * since otherwise lockdep will be angered in radeon.
1299          */
1300         if (!resv) {
1301                 locked = reservation_object_trylock(bo->resv);
1302                 WARN_ON(!locked);
1303         }
1304
1305         if (likely(!ret))
1306                 ret = ttm_bo_validate(bo, placement, ctx);
1307
1308         if (unlikely(ret)) {
1309                 if (!resv)
1310                         ttm_bo_unreserve(bo);
1311
1312                 ttm_bo_put(bo);
1313                 return ret;
1314         }
1315
1316         if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1317                 spin_lock(&bdev->glob->lru_lock);
1318                 ttm_bo_add_to_lru(bo);
1319                 spin_unlock(&bdev->glob->lru_lock);
1320         }
1321
1322         return ret;
1323 }
1324 EXPORT_SYMBOL(ttm_bo_init_reserved);
1325
1326 int ttm_bo_init(struct ttm_bo_device *bdev,
1327                 struct ttm_buffer_object *bo,
1328                 unsigned long size,
1329                 enum ttm_bo_type type,
1330                 struct ttm_placement *placement,
1331                 uint32_t page_alignment,
1332                 bool interruptible,
1333                 size_t acc_size,
1334                 struct sg_table *sg,
1335                 struct reservation_object *resv,
1336                 void (*destroy) (struct ttm_buffer_object *))
1337 {
1338         struct ttm_operation_ctx ctx = { interruptible, false };
1339         int ret;
1340
1341         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1342                                    page_alignment, &ctx, acc_size,
1343                                    sg, resv, destroy);
1344         if (ret)
1345                 return ret;
1346
1347         if (!resv)
1348                 ttm_bo_unreserve(bo);
1349
1350         return 0;
1351 }
1352 EXPORT_SYMBOL(ttm_bo_init);
1353
1354 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1355                        unsigned long bo_size,
1356                        unsigned struct_size)
1357 {
1358         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1359         size_t size = 0;
1360
1361         size += ttm_round_pot(struct_size);
1362         size += ttm_round_pot(npages * sizeof(void *));
1363         size += ttm_round_pot(sizeof(struct ttm_tt));
1364         return size;
1365 }
1366 EXPORT_SYMBOL(ttm_bo_acc_size);
1367
1368 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1369                            unsigned long bo_size,
1370                            unsigned struct_size)
1371 {
1372         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1373         size_t size = 0;
1374
1375         size += ttm_round_pot(struct_size);
1376         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1377         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1378         return size;
1379 }
1380 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1381
1382 int ttm_bo_create(struct ttm_bo_device *bdev,
1383                         unsigned long size,
1384                         enum ttm_bo_type type,
1385                         struct ttm_placement *placement,
1386                         uint32_t page_alignment,
1387                         bool interruptible,
1388                         struct ttm_buffer_object **p_bo)
1389 {
1390         struct ttm_buffer_object *bo;
1391         size_t acc_size;
1392         int ret;
1393
1394         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1395         if (unlikely(bo == NULL))
1396                 return -ENOMEM;
1397
1398         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1399         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1400                           interruptible, acc_size,
1401                           NULL, NULL, NULL);
1402         if (likely(ret == 0))
1403                 *p_bo = bo;
1404
1405         return ret;
1406 }
1407 EXPORT_SYMBOL(ttm_bo_create);
1408
1409 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1410                                    unsigned mem_type)
1411 {
1412         struct ttm_operation_ctx ctx = {
1413                 .interruptible = false,
1414                 .no_wait_gpu = false,
1415                 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1416         };
1417         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1418         struct ttm_bo_global *glob = bdev->glob;
1419         struct dma_fence *fence;
1420         int ret;
1421         unsigned i;
1422
1423         /*
1424          * Can't use standard list traversal since we're unlocking.
1425          */
1426
1427         spin_lock(&glob->lru_lock);
1428         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1429                 while (!list_empty(&man->lru[i])) {
1430                         spin_unlock(&glob->lru_lock);
1431                         ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx);
1432                         if (ret)
1433                                 return ret;
1434                         spin_lock(&glob->lru_lock);
1435                 }
1436         }
1437         spin_unlock(&glob->lru_lock);
1438
1439         spin_lock(&man->move_lock);
1440         fence = dma_fence_get(man->move);
1441         spin_unlock(&man->move_lock);
1442
1443         if (fence) {
1444                 ret = dma_fence_wait(fence, false);
1445                 dma_fence_put(fence);
1446                 if (ret)
1447                         return ret;
1448         }
1449
1450         return 0;
1451 }
1452
1453 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1454 {
1455         struct ttm_mem_type_manager *man;
1456         int ret = -EINVAL;
1457
1458         if (mem_type >= TTM_NUM_MEM_TYPES) {
1459                 pr_err("Illegal memory type %d\n", mem_type);
1460                 return ret;
1461         }
1462         man = &bdev->man[mem_type];
1463
1464         if (!man->has_type) {
1465                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1466                        mem_type);
1467                 return ret;
1468         }
1469
1470         man->use_type = false;
1471         man->has_type = false;
1472
1473         ret = 0;
1474         if (mem_type > 0) {
1475                 ret = ttm_bo_force_list_clean(bdev, mem_type);
1476                 if (ret) {
1477                         pr_err("Cleanup eviction failed\n");
1478                         return ret;
1479                 }
1480
1481                 ret = (*man->func->takedown)(man);
1482         }
1483
1484         dma_fence_put(man->move);
1485         man->move = NULL;
1486
1487         return ret;
1488 }
1489 EXPORT_SYMBOL(ttm_bo_clean_mm);
1490
1491 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1492 {
1493         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1494
1495         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1496                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1497                 return -EINVAL;
1498         }
1499
1500         if (!man->has_type) {
1501                 pr_err("Memory type %u has not been initialized\n", mem_type);
1502                 return 0;
1503         }
1504
1505         return ttm_bo_force_list_clean(bdev, mem_type);
1506 }
1507 EXPORT_SYMBOL(ttm_bo_evict_mm);
1508
1509 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1510                         unsigned long p_size)
1511 {
1512         int ret;
1513         struct ttm_mem_type_manager *man;
1514         unsigned i;
1515
1516         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1517         man = &bdev->man[type];
1518         BUG_ON(man->has_type);
1519         man->io_reserve_fastpath = true;
1520         man->use_io_reserve_lru = false;
1521         mutex_init(&man->io_reserve_mutex);
1522         spin_lock_init(&man->move_lock);
1523         INIT_LIST_HEAD(&man->io_reserve_lru);
1524
1525         ret = bdev->driver->init_mem_type(bdev, type, man);
1526         if (ret)
1527                 return ret;
1528         man->bdev = bdev;
1529
1530         if (type != TTM_PL_SYSTEM) {
1531                 ret = (*man->func->init)(man, p_size);
1532                 if (ret)
1533                         return ret;
1534         }
1535         man->has_type = true;
1536         man->use_type = true;
1537         man->size = p_size;
1538
1539         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1540                 INIT_LIST_HEAD(&man->lru[i]);
1541         man->move = NULL;
1542
1543         return 0;
1544 }
1545 EXPORT_SYMBOL(ttm_bo_init_mm);
1546
1547 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1548 {
1549         struct ttm_bo_global *glob =
1550                 container_of(kobj, struct ttm_bo_global, kobj);
1551
1552         __free_page(glob->dummy_read_page);
1553 }
1554
1555 static void ttm_bo_global_release(void)
1556 {
1557         struct ttm_bo_global *glob = &ttm_bo_glob;
1558
1559         mutex_lock(&ttm_global_mutex);
1560         if (--ttm_bo_glob_use_count > 0)
1561                 goto out;
1562
1563         kobject_del(&glob->kobj);
1564         kobject_put(&glob->kobj);
1565         ttm_mem_global_release(&ttm_mem_glob);
1566         memset(glob, 0, sizeof(*glob));
1567 out:
1568         mutex_unlock(&ttm_global_mutex);
1569 }
1570
1571 static int ttm_bo_global_init(void)
1572 {
1573         struct ttm_bo_global *glob = &ttm_bo_glob;
1574         int ret = 0;
1575         unsigned i;
1576
1577         mutex_lock(&ttm_global_mutex);
1578         if (++ttm_bo_glob_use_count > 1)
1579                 goto out;
1580
1581         ret = ttm_mem_global_init(&ttm_mem_glob);
1582         if (ret)
1583                 goto out;
1584
1585         spin_lock_init(&glob->lru_lock);
1586         glob->mem_glob = &ttm_mem_glob;
1587         glob->mem_glob->bo_glob = glob;
1588         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1589
1590         if (unlikely(glob->dummy_read_page == NULL)) {
1591                 ret = -ENOMEM;
1592                 goto out;
1593         }
1594
1595         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1596                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1597         INIT_LIST_HEAD(&glob->device_list);
1598         atomic_set(&glob->bo_count, 0);
1599
1600         ret = kobject_init_and_add(
1601                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1602         if (unlikely(ret != 0))
1603                 kobject_put(&glob->kobj);
1604 out:
1605         mutex_unlock(&ttm_global_mutex);
1606         return ret;
1607 }
1608
1609 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1610 {
1611         int ret = 0;
1612         unsigned i = TTM_NUM_MEM_TYPES;
1613         struct ttm_mem_type_manager *man;
1614         struct ttm_bo_global *glob = bdev->glob;
1615
1616         while (i--) {
1617                 man = &bdev->man[i];
1618                 if (man->has_type) {
1619                         man->use_type = false;
1620                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1621                                 ret = -EBUSY;
1622                                 pr_err("DRM memory manager type %d is not clean\n",
1623                                        i);
1624                         }
1625                         man->has_type = false;
1626                 }
1627         }
1628
1629         mutex_lock(&ttm_global_mutex);
1630         list_del(&bdev->device_list);
1631         mutex_unlock(&ttm_global_mutex);
1632
1633         cancel_delayed_work_sync(&bdev->wq);
1634
1635         if (ttm_bo_delayed_delete(bdev, true))
1636                 pr_debug("Delayed destroy list was clean\n");
1637
1638         spin_lock(&glob->lru_lock);
1639         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1640                 if (list_empty(&bdev->man[0].lru[0]))
1641                         pr_debug("Swap list %d was clean\n", i);
1642         spin_unlock(&glob->lru_lock);
1643
1644         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1645
1646         if (!ret)
1647                 ttm_bo_global_release();
1648
1649         return ret;
1650 }
1651 EXPORT_SYMBOL(ttm_bo_device_release);
1652
1653 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1654                        struct ttm_bo_driver *driver,
1655                        struct address_space *mapping,
1656                        bool need_dma32)
1657 {
1658         struct ttm_bo_global *glob = &ttm_bo_glob;
1659         int ret;
1660
1661         ret = ttm_bo_global_init();
1662         if (ret)
1663                 return ret;
1664
1665         bdev->driver = driver;
1666
1667         memset(bdev->man, 0, sizeof(bdev->man));
1668
1669         /*
1670          * Initialize the system memory buffer type.
1671          * Other types need to be driver / IOCTL initialized.
1672          */
1673         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1674         if (unlikely(ret != 0))
1675                 goto out_no_sys;
1676
1677         drm_vma_offset_manager_init(&bdev->vma_manager,
1678                                     DRM_FILE_PAGE_OFFSET_START,
1679                                     DRM_FILE_PAGE_OFFSET_SIZE);
1680         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1681         INIT_LIST_HEAD(&bdev->ddestroy);
1682         bdev->dev_mapping = mapping;
1683         bdev->glob = glob;
1684         bdev->need_dma32 = need_dma32;
1685         mutex_lock(&ttm_global_mutex);
1686         list_add_tail(&bdev->device_list, &glob->device_list);
1687         mutex_unlock(&ttm_global_mutex);
1688
1689         return 0;
1690 out_no_sys:
1691         ttm_bo_global_release();
1692         return ret;
1693 }
1694 EXPORT_SYMBOL(ttm_bo_device_init);
1695
1696 /*
1697  * buffer object vm functions.
1698  */
1699
1700 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1701 {
1702         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1703
1704         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1705                 if (mem->mem_type == TTM_PL_SYSTEM)
1706                         return false;
1707
1708                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1709                         return false;
1710
1711                 if (mem->placement & TTM_PL_FLAG_CACHED)
1712                         return false;
1713         }
1714         return true;
1715 }
1716
1717 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1718 {
1719         struct ttm_bo_device *bdev = bo->bdev;
1720
1721         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1722         ttm_mem_io_free_vm(bo);
1723 }
1724
1725 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1726 {
1727         struct ttm_bo_device *bdev = bo->bdev;
1728         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1729
1730         ttm_mem_io_lock(man, false);
1731         ttm_bo_unmap_virtual_locked(bo);
1732         ttm_mem_io_unlock(man);
1733 }
1734
1735
1736 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1737
1738 int ttm_bo_wait(struct ttm_buffer_object *bo,
1739                 bool interruptible, bool no_wait)
1740 {
1741         long timeout = 15 * HZ;
1742
1743         if (no_wait) {
1744                 if (reservation_object_test_signaled_rcu(bo->resv, true))
1745                         return 0;
1746                 else
1747                         return -EBUSY;
1748         }
1749
1750         timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1751                                                       interruptible, timeout);
1752         if (timeout < 0)
1753                 return timeout;
1754
1755         if (timeout == 0)
1756                 return -EBUSY;
1757
1758         reservation_object_add_excl_fence(bo->resv, NULL);
1759         return 0;
1760 }
1761 EXPORT_SYMBOL(ttm_bo_wait);
1762
1763 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1764 {
1765         int ret = 0;
1766
1767         /*
1768          * Using ttm_bo_reserve makes sure the lru lists are updated.
1769          */
1770
1771         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1772         if (unlikely(ret != 0))
1773                 return ret;
1774         ret = ttm_bo_wait(bo, true, no_wait);
1775         if (likely(ret == 0))
1776                 atomic_inc(&bo->cpu_writers);
1777         ttm_bo_unreserve(bo);
1778         return ret;
1779 }
1780 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1781
1782 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1783 {
1784         atomic_dec(&bo->cpu_writers);
1785 }
1786 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1787
1788 /**
1789  * A buffer object shrink method that tries to swap out the first
1790  * buffer object on the bo_global::swap_lru list.
1791  */
1792 int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1793 {
1794         struct ttm_buffer_object *bo;
1795         int ret = -EBUSY;
1796         bool locked;
1797         unsigned i;
1798
1799         spin_lock(&glob->lru_lock);
1800         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1801                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1802                         if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked)) {
1803                                 ret = 0;
1804                                 break;
1805                         }
1806                 }
1807                 if (!ret)
1808                         break;
1809         }
1810
1811         if (ret) {
1812                 spin_unlock(&glob->lru_lock);
1813                 return ret;
1814         }
1815
1816         kref_get(&bo->list_kref);
1817
1818         if (!list_empty(&bo->ddestroy)) {
1819                 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1820                 kref_put(&bo->list_kref, ttm_bo_release_list);
1821                 return ret;
1822         }
1823
1824         ttm_bo_del_from_lru(bo);
1825         spin_unlock(&glob->lru_lock);
1826
1827         /**
1828          * Move to system cached
1829          */
1830
1831         if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1832             bo->ttm->caching_state != tt_cached) {
1833                 struct ttm_operation_ctx ctx = { false, false };
1834                 struct ttm_mem_reg evict_mem;
1835
1836                 evict_mem = bo->mem;
1837                 evict_mem.mm_node = NULL;
1838                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1839                 evict_mem.mem_type = TTM_PL_SYSTEM;
1840
1841                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1842                 if (unlikely(ret != 0))
1843                         goto out;
1844         }
1845
1846         /**
1847          * Make sure BO is idle.
1848          */
1849
1850         ret = ttm_bo_wait(bo, false, false);
1851         if (unlikely(ret != 0))
1852                 goto out;
1853
1854         ttm_bo_unmap_virtual(bo);
1855
1856         /**
1857          * Swap out. Buffer will be swapped in again as soon as
1858          * anyone tries to access a ttm page.
1859          */
1860
1861         if (bo->bdev->driver->swap_notify)
1862                 bo->bdev->driver->swap_notify(bo);
1863
1864         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1865 out:
1866
1867         /**
1868          *
1869          * Unreserve without putting on LRU to avoid swapping out an
1870          * already swapped buffer.
1871          */
1872         if (locked)
1873                 reservation_object_unlock(bo->resv);
1874         kref_put(&bo->list_kref, ttm_bo_release_list);
1875         return ret;
1876 }
1877 EXPORT_SYMBOL(ttm_bo_swapout);
1878
1879 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1880 {
1881         struct ttm_operation_ctx ctx = {
1882                 .interruptible = false,
1883                 .no_wait_gpu = false
1884         };
1885
1886         while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1887                 ;
1888 }
1889 EXPORT_SYMBOL(ttm_bo_swapout_all);
1890
1891 /**
1892  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1893  * unreserved
1894  *
1895  * @bo: Pointer to buffer
1896  */
1897 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1898 {
1899         int ret;
1900
1901         /*
1902          * In the absense of a wait_unlocked API,
1903          * Use the bo::wu_mutex to avoid triggering livelocks due to
1904          * concurrent use of this function. Note that this use of
1905          * bo::wu_mutex can go away if we change locking order to
1906          * mmap_sem -> bo::reserve.
1907          */
1908         ret = mutex_lock_interruptible(&bo->wu_mutex);
1909         if (unlikely(ret != 0))
1910                 return -ERESTARTSYS;
1911         if (!ww_mutex_is_locked(&bo->resv->lock))
1912                 goto out_unlock;
1913         ret = reservation_object_lock_interruptible(bo->resv, NULL);
1914         if (ret == -EINTR)
1915                 ret = -ERESTARTSYS;
1916         if (unlikely(ret != 0))
1917                 goto out_unlock;
1918         reservation_object_unlock(bo->resv);
1919
1920 out_unlock:
1921         mutex_unlock(&bo->wu_mutex);
1922         return ret;
1923 }