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