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 (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 177                 BUG_ON(!list_empty(&bo->lru));
 178
 179                 man = &bdev->man[bo->mem.mem_type];
 180                 list_add_tail(&bo->lru, &man->lru[bo->priority]);
 181                 kref_get(&bo->list_kref);
 182
 183                 if (bo->ttm && !(bo->ttm->page_flags &
 184                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED))) {
 185                         list_add_tail(&bo->swap,
 186                                       &bdev->glob->swap_lru[bo->priority]);
 187                         kref_get(&bo->list_kref);
 188                 }
 189         }
 190 }
 191 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 192
 193 static void ttm_bo_ref_bug(struct kref *list_kref)
 194 {
 195         BUG();
 196 }
 197
 198 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 199 {
 200         struct ttm_bo_device *bdev = bo->bdev;
 201         bool notify = false;
 202
 203         if (!list_empty(&bo->swap)) {
 204                 list_del_init(&bo->swap);
 205                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 206                 notify = true;
 207         }
 208         if (!list_empty(&bo->lru)) {
 209                 list_del_init(&bo->lru);
 210                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 211                 notify = true;
 212         }
 213
 214         if (notify && bdev->driver->del_from_lru_notify)
 215                 bdev->driver->del_from_lru_notify(bo);
 216 }
 217
 218 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 219 {
 220         struct ttm_bo_global *glob = bo->bdev->glob;
 221
 222         spin_lock(&glob->lru_lock);
 223         ttm_bo_del_from_lru(bo);
 224         spin_unlock(&glob->lru_lock);
 225 }
 226 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 227
 228 static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
 229                                      struct ttm_buffer_object *bo)
 230 {
 231         if (!pos->first)
 232                 pos->first = bo;
 233         pos->last = bo;
 234 }
 235
 236 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 237                              struct ttm_lru_bulk_move *bulk)
 238 {
 239         reservation_object_assert_held(bo->resv);
 240
 241         ttm_bo_del_from_lru(bo);
 242         ttm_bo_add_to_lru(bo);
 243
 244         if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 245                 switch (bo->mem.mem_type) {
 246                 case TTM_PL_TT:
 247                         ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
 248                         break;
 249
 250                 case TTM_PL_VRAM:
 251                         ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
 252                         break;
 253                 }
 254                 if (bo->ttm && !(bo->ttm->page_flags &
 255                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
 256                         ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
 257         }
 258 }
 259 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 260
 261 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
 262 {
 263         unsigned i;
 264
 265         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 266                 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
 267                 struct ttm_mem_type_manager *man;
 268
 269                 if (!pos->first)
 270                         continue;
 271
 272                 reservation_object_assert_held(pos->first->resv);
 273                 reservation_object_assert_held(pos->last->resv);
 274
 275                 man = &pos->first->bdev->man[TTM_PL_TT];
 276                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 277                                     &pos->last->lru);
 278         }
 279
 280         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 281                 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
 282                 struct ttm_mem_type_manager *man;
 283
 284                 if (!pos->first)
 285                         continue;
 286
 287                 reservation_object_assert_held(pos->first->resv);
 288                 reservation_object_assert_held(pos->last->resv);
 289
 290                 man = &pos->first->bdev->man[TTM_PL_VRAM];
 291                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 292                                     &pos->last->lru);
 293         }
 294
 295         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 296                 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
 297                 struct list_head *lru;
 298
 299                 if (!pos->first)
 300                         continue;
 301
 302                 reservation_object_assert_held(pos->first->resv);
 303                 reservation_object_assert_held(pos->last->resv);
 304
 305                 lru = &pos->first->bdev->glob->swap_lru[i];
 306                 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
 307         }
 308 }
 309 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
 310
 311 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 312                                   struct ttm_mem_reg *mem, bool evict,
 313                                   struct ttm_operation_ctx *ctx)
 314 {
 315         struct ttm_bo_device *bdev = bo->bdev;
 316         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 317         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 318         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 319         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 320         int ret = 0;
 321
 322         if (old_is_pci || new_is_pci ||
 323             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 324                 ret = ttm_mem_io_lock(old_man, true);
 325                 if (unlikely(ret != 0))
 326                         goto out_err;
 327                 ttm_bo_unmap_virtual_locked(bo);
 328                 ttm_mem_io_unlock(old_man);
 329         }
 330
 331         /*
 332          * Create and bind a ttm if required.
 333          */
 334
 335         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 336                 if (bo->ttm == NULL) {
 337                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 338                         ret = ttm_tt_create(bo, zero);
 339                         if (ret)
 340                                 goto out_err;
 341                 }
 342
 343                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 344                 if (ret)
 345                         goto out_err;
 346
 347                 if (mem->mem_type != TTM_PL_SYSTEM) {
 348                         ret = ttm_tt_bind(bo->ttm, mem, ctx);
 349                         if (ret)
 350                                 goto out_err;
 351                 }
 352
 353                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 354                         if (bdev->driver->move_notify)
 355                                 bdev->driver->move_notify(bo, evict, mem);
 356                         bo->mem = *mem;
 357                         mem->mm_node = NULL;
 358                         goto moved;
 359                 }
 360         }
 361
 362         if (bdev->driver->move_notify)
 363                 bdev->driver->move_notify(bo, evict, mem);
 364
 365         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 366             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 367                 ret = ttm_bo_move_ttm(bo, ctx, mem);
 368         else if (bdev->driver->move)
 369                 ret = bdev->driver->move(bo, evict, ctx, mem);
 370         else
 371                 ret = ttm_bo_move_memcpy(bo, ctx, mem);
 372
 373         if (ret) {
 374                 if (bdev->driver->move_notify) {
 375                         swap(*mem, bo->mem);
 376                         bdev->driver->move_notify(bo, false, mem);
 377                         swap(*mem, bo->mem);
 378                 }
 379
 380                 goto out_err;
 381         }
 382
 383 moved:
 384         if (bo->evicted) {
 385                 if (bdev->driver->invalidate_caches) {
 386                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 387                         if (ret)
 388                                 pr_err("Can not flush read caches\n");
 389                 }
 390                 bo->evicted = false;
 391         }
 392
 393         if (bo->mem.mm_node)
 394                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 395                     bdev->man[bo->mem.mem_type].gpu_offset;
 396         else
 397                 bo->offset = 0;
 398
 399         ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
 400         return 0;
 401
 402 out_err:
 403         new_man = &bdev->man[bo->mem.mem_type];
 404         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 405                 ttm_tt_destroy(bo->ttm);
 406                 bo->ttm = NULL;
 407         }
 408
 409         return ret;
 410 }
 411
 412 /**
 413  * Call bo::reserved.
 414  * Will release GPU memory type usage on destruction.
 415  * This is the place to put in driver specific hooks to release
 416  * driver private resources.
 417  * Will release the bo::reserved lock.
 418  */
 419
 420 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 421 {
 422         if (bo->bdev->driver->move_notify)
 423                 bo->bdev->driver->move_notify(bo, false, NULL);
 424
 425         ttm_tt_destroy(bo->ttm);
 426         bo->ttm = NULL;
 427         ttm_bo_mem_put(bo, &bo->mem);
 428 }
 429
 430 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 431 {
 432         int r;
 433
 434         if (bo->resv == &bo->ttm_resv)
 435                 return 0;
 436
 437         BUG_ON(!reservation_object_trylock(&bo->ttm_resv));
 438
 439         r = reservation_object_copy_fences(&bo->ttm_resv, bo->resv);
 440         if (r)
 441                 reservation_object_unlock(&bo->ttm_resv);
 442
 443         return r;
 444 }
 445
 446 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 447 {
 448         struct reservation_object_list *fobj;
 449         struct dma_fence *fence;
 450         int i;
 451
 452         fobj = reservation_object_get_list(&bo->ttm_resv);
 453         fence = reservation_object_get_excl(&bo->ttm_resv);
 454         if (fence && !fence->ops->signaled)
 455                 dma_fence_enable_sw_signaling(fence);
 456
 457         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 458                 fence = rcu_dereference_protected(fobj->shared[i],
 459                                         reservation_object_held(bo->resv));
 460
 461                 if (!fence->ops->signaled)
 462                         dma_fence_enable_sw_signaling(fence);
 463         }
 464 }
 465
 466 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 467 {
 468         struct ttm_bo_device *bdev = bo->bdev;
 469         struct ttm_bo_global *glob = bdev->glob;
 470         int ret;
 471
 472         ret = ttm_bo_individualize_resv(bo);
 473         if (ret) {
 474                 /* Last resort, if we fail to allocate memory for the
 475                  * fences block for the BO to become idle
 476                  */
 477                 reservation_object_wait_timeout_rcu(bo->resv, true, false,
 478                                                     30 * HZ);
 479                 spin_lock(&glob->lru_lock);
 480                 goto error;
 481         }
 482
 483         spin_lock(&glob->lru_lock);
 484         ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
 485         if (!ret) {
 486                 if (reservation_object_test_signaled_rcu(&bo->ttm_resv, true)) {
 487                         ttm_bo_del_from_lru(bo);
 488                         spin_unlock(&glob->lru_lock);
 489                         if (bo->resv != &bo->ttm_resv)
 490                                 reservation_object_unlock(&bo->ttm_resv);
 491
 492                         ttm_bo_cleanup_memtype_use(bo);
 493                         reservation_object_unlock(bo->resv);
 494                         return;
 495                 }
 496
 497                 ttm_bo_flush_all_fences(bo);
 498
 499                 /*
 500                  * Make NO_EVICT bos immediately available to
 501                  * shrinkers, now that they are queued for
 502                  * destruction.
 503                  */
 504                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 505                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 506                         ttm_bo_add_to_lru(bo);
 507                 }
 508
 509                 reservation_object_unlock(bo->resv);
 510         }
 511         if (bo->resv != &bo->ttm_resv)
 512                 reservation_object_unlock(&bo->ttm_resv);
 513
 514 error:
 515         kref_get(&bo->list_kref);
 516         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 517         spin_unlock(&glob->lru_lock);
 518
 519         schedule_delayed_work(&bdev->wq,
 520                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 521 }
 522
 523 /**
 524  * function ttm_bo_cleanup_refs
 525  * If bo idle, remove from delayed- and lru lists, and unref.
 526  * If not idle, do nothing.
 527  *
 528  * Must be called with lru_lock and reservation held, this function
 529  * will drop the lru lock and optionally the reservation lock before returning.
 530  *
 531  * @interruptible         Any sleeps should occur interruptibly.
 532  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 533  * @unlock_resv           Unlock the reservation lock as well.
 534  */
 535
 536 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 537                                bool interruptible, bool no_wait_gpu,
 538                                bool unlock_resv)
 539 {
 540         struct ttm_bo_global *glob = bo->bdev->glob;
 541         struct reservation_object *resv;
 542         int ret;
 543
 544         if (unlikely(list_empty(&bo->ddestroy)))
 545                 resv = bo->resv;
 546         else
 547                 resv = &bo->ttm_resv;
 548
 549         if (reservation_object_test_signaled_rcu(resv, true))
 550                 ret = 0;
 551         else
 552                 ret = -EBUSY;
 553
 554         if (ret && !no_wait_gpu) {
 555                 long lret;
 556
 557                 if (unlock_resv)
 558                         reservation_object_unlock(bo->resv);
 559                 spin_unlock(&glob->lru_lock);
 560
 561                 lret = reservation_object_wait_timeout_rcu(resv, true,
 562                                                            interruptible,
 563                                                            30 * HZ);
 564
 565                 if (lret < 0)
 566                         return lret;
 567                 else if (lret == 0)
 568                         return -EBUSY;
 569
 570                 spin_lock(&glob->lru_lock);
 571                 if (unlock_resv && !reservation_object_trylock(bo->resv)) {
 572                         /*
 573                          * We raced, and lost, someone else holds the reservation now,
 574                          * and is probably busy in ttm_bo_cleanup_memtype_use.
 575                          *
 576                          * Even if it's not the case, because we finished waiting any
 577                          * delayed destruction would succeed, so just return success
 578                          * here.
 579                          */
 580                         spin_unlock(&glob->lru_lock);
 581                         return 0;
 582                 }
 583                 ret = 0;
 584         }
 585
 586         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 587                 if (unlock_resv)
 588                         reservation_object_unlock(bo->resv);
 589                 spin_unlock(&glob->lru_lock);
 590                 return ret;
 591         }
 592
 593         ttm_bo_del_from_lru(bo);
 594         list_del_init(&bo->ddestroy);
 595         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 596
 597         spin_unlock(&glob->lru_lock);
 598         ttm_bo_cleanup_memtype_use(bo);
 599
 600         if (unlock_resv)
 601                 reservation_object_unlock(bo->resv);
 602
 603         return 0;
 604 }
 605
 606 /**
 607  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 608  * encountered buffers.
 609  */
 610 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 611 {
 612         struct ttm_bo_global *glob = bdev->glob;
 613         struct list_head removed;
 614         bool empty;
 615
 616         INIT_LIST_HEAD(&removed);
 617
 618         spin_lock(&glob->lru_lock);
 619         while (!list_empty(&bdev->ddestroy)) {
 620                 struct ttm_buffer_object *bo;
 621
 622                 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
 623                                       ddestroy);
 624                 kref_get(&bo->list_kref);
 625                 list_move_tail(&bo->ddestroy, &removed);
 626
 627                 if (remove_all || bo->resv != &bo->ttm_resv) {
 628                         spin_unlock(&glob->lru_lock);
 629                         reservation_object_lock(bo->resv, NULL);
 630
 631                         spin_lock(&glob->lru_lock);
 632                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 633
 634                 } else if (reservation_object_trylock(bo->resv)) {
 635                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 636                 } else {
 637                         spin_unlock(&glob->lru_lock);
 638                 }
 639
 640                 kref_put(&bo->list_kref, ttm_bo_release_list);
 641                 spin_lock(&glob->lru_lock);
 642         }
 643         list_splice_tail(&removed, &bdev->ddestroy);
 644         empty = list_empty(&bdev->ddestroy);
 645         spin_unlock(&glob->lru_lock);
 646
 647         return empty;
 648 }
 649
 650 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 651 {
 652         struct ttm_bo_device *bdev =
 653             container_of(work, struct ttm_bo_device, wq.work);
 654
 655         if (!ttm_bo_delayed_delete(bdev, false))
 656                 schedule_delayed_work(&bdev->wq,
 657                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 658 }
 659
 660 static void ttm_bo_release(struct kref *kref)
 661 {
 662         struct ttm_buffer_object *bo =
 663             container_of(kref, struct ttm_buffer_object, kref);
 664         struct ttm_bo_device *bdev = bo->bdev;
 665         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 666
 667         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 668         ttm_mem_io_lock(man, false);
 669         ttm_mem_io_free_vm(bo);
 670         ttm_mem_io_unlock(man);
 671         ttm_bo_cleanup_refs_or_queue(bo);
 672         kref_put(&bo->list_kref, ttm_bo_release_list);
 673 }
 674
 675 void ttm_bo_put(struct ttm_buffer_object *bo)
 676 {
 677         kref_put(&bo->kref, ttm_bo_release);
 678 }
 679 EXPORT_SYMBOL(ttm_bo_put);
 680
 681 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 682 {
 683         return cancel_delayed_work_sync(&bdev->wq);
 684 }
 685 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 686
 687 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 688 {
 689         if (resched)
 690                 schedule_delayed_work(&bdev->wq,
 691                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 692 }
 693 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 694
 695 static int ttm_bo_evict(struct ttm_buffer_object *bo,
 696                         struct ttm_operation_ctx *ctx)
 697 {
 698         struct ttm_bo_device *bdev = bo->bdev;
 699         struct ttm_mem_reg evict_mem;
 700         struct ttm_placement placement;
 701         int ret = 0;
 702
 703         reservation_object_assert_held(bo->resv);
 704
 705         placement.num_placement = 0;
 706         placement.num_busy_placement = 0;
 707         bdev->driver->evict_flags(bo, &placement);
 708
 709         if (!placement.num_placement && !placement.num_busy_placement) {
 710                 ret = ttm_bo_pipeline_gutting(bo);
 711                 if (ret)
 712                         return ret;
 713
 714                 return ttm_tt_create(bo, false);
 715         }
 716
 717         evict_mem = bo->mem;
 718         evict_mem.mm_node = NULL;
 719         evict_mem.bus.io_reserved_vm = false;
 720         evict_mem.bus.io_reserved_count = 0;
 721
 722         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 723         if (ret) {
 724                 if (ret != -ERESTARTSYS) {
 725                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 726                                bo);
 727                         ttm_bo_mem_space_debug(bo, &placement);
 728                 }
 729                 goto out;
 730         }
 731
 732         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
 733         if (unlikely(ret)) {
 734                 if (ret != -ERESTARTSYS)
 735                         pr_err("Buffer eviction failed\n");
 736                 ttm_bo_mem_put(bo, &evict_mem);
 737                 goto out;
 738         }
 739         bo->evicted = true;
 740 out:
 741         return ret;
 742 }
 743
 744 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 745                               const struct ttm_place *place)
 746 {
 747         /* Don't evict this BO if it's outside of the
 748          * requested placement range
 749          */
 750         if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 751             (place->lpfn && place->lpfn <= bo->mem.start))
 752                 return false;
 753
 754         return true;
 755 }
 756 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 757
 758 /**
 759  * Check the target bo is allowable to be evicted or swapout, including cases:
 760  *
 761  * a. if share same reservation object with ctx->resv, have assumption
 762  * reservation objects should already be locked, so not lock again and
 763  * return true directly when either the opreation allow_reserved_eviction
 764  * or the target bo already is in delayed free list;
 765  *
 766  * b. Otherwise, trylock it.
 767  */
 768 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 769                         struct ttm_operation_ctx *ctx, bool *locked)
 770 {
 771         bool ret = false;
 772
 773         *locked = false;
 774         if (bo->resv == ctx->resv) {
 775                 reservation_object_assert_held(bo->resv);
 776                 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT
 777                     || !list_empty(&bo->ddestroy))
 778                         ret = true;
 779         } else {
 780                 *locked = reservation_object_trylock(bo->resv);
 781                 ret = *locked;
 782         }
 783
 784         return ret;
 785 }
 786
 787 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 788                                uint32_t mem_type,
 789                                const struct ttm_place *place,
 790                                struct ttm_operation_ctx *ctx)
 791 {
 792         struct ttm_bo_global *glob = bdev->glob;
 793         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 794         struct ttm_buffer_object *bo = NULL;
 795         bool locked = false;
 796         unsigned i;
 797         int ret;
 798
 799         spin_lock(&glob->lru_lock);
 800         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 801                 list_for_each_entry(bo, &man->lru[i], lru) {
 802                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked))
 803                                 continue;
 804
 805                         if (place && !bdev->driver->eviction_valuable(bo,
 806                                                                       place)) {
 807                                 if (locked)
 808                                         reservation_object_unlock(bo->resv);
 809                                 continue;
 810                         }
 811                         break;
 812                 }
 813
 814                 /* If the inner loop terminated early, we have our candidate */
 815                 if (&bo->lru != &man->lru[i])
 816                         break;
 817
 818                 bo = NULL;
 819         }
 820
 821         if (!bo) {
 822                 spin_unlock(&glob->lru_lock);
 823                 return -EBUSY;
 824         }
 825
 826         kref_get(&bo->list_kref);
 827
 828         if (!list_empty(&bo->ddestroy)) {
 829                 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
 830                                           ctx->no_wait_gpu, locked);
 831                 kref_put(&bo->list_kref, ttm_bo_release_list);
 832                 return ret;
 833         }
 834
 835         ttm_bo_del_from_lru(bo);
 836         spin_unlock(&glob->lru_lock);
 837
 838         ret = ttm_bo_evict(bo, ctx);
 839         if (locked) {
 840                 ttm_bo_unreserve(bo);
 841         } else {
 842                 spin_lock(&glob->lru_lock);
 843                 ttm_bo_add_to_lru(bo);
 844                 spin_unlock(&glob->lru_lock);
 845         }
 846
 847         kref_put(&bo->list_kref, ttm_bo_release_list);
 848         return ret;
 849 }
 850
 851 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 852 {
 853         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 854
 855         if (mem->mm_node)
 856                 (*man->func->put_node)(man, mem);
 857 }
 858 EXPORT_SYMBOL(ttm_bo_mem_put);
 859
 860 /**
 861  * Add the last move fence to the BO and reserve a new shared slot.
 862  */
 863 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 864                                  struct ttm_mem_type_manager *man,
 865                                  struct ttm_mem_reg *mem)
 866 {
 867         struct dma_fence *fence;
 868         int ret;
 869
 870         spin_lock(&man->move_lock);
 871         fence = dma_fence_get(man->move);
 872         spin_unlock(&man->move_lock);
 873
 874         if (fence) {
 875                 reservation_object_add_shared_fence(bo->resv, fence);
 876
 877                 ret = reservation_object_reserve_shared(bo->resv, 1);
 878                 if (unlikely(ret)) {
 879                         dma_fence_put(fence);
 880                         return ret;
 881                 }
 882
 883                 dma_fence_put(bo->moving);
 884                 bo->moving = fence;
 885         }
 886
 887         return 0;
 888 }
 889
 890 /**
 891  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 892  * space, or we've evicted everything and there isn't enough space.
 893  */
 894 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 895                                         uint32_t mem_type,
 896                                         const struct ttm_place *place,
 897                                         struct ttm_mem_reg *mem,
 898                                         struct ttm_operation_ctx *ctx)
 899 {
 900         struct ttm_bo_device *bdev = bo->bdev;
 901         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 902         int ret;
 903
 904         do {
 905                 ret = (*man->func->get_node)(man, bo, place, mem);
 906                 if (unlikely(ret != 0))
 907                         return ret;
 908                 if (mem->mm_node)
 909                         break;
 910                 ret = ttm_mem_evict_first(bdev, mem_type, place, ctx);
 911                 if (unlikely(ret != 0))
 912                         return ret;
 913         } while (1);
 914         mem->mem_type = mem_type;
 915         return ttm_bo_add_move_fence(bo, man, mem);
 916 }
 917
 918 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 919                                       uint32_t cur_placement,
 920                                       uint32_t proposed_placement)
 921 {
 922         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 923         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 924
 925         /**
 926          * Keep current caching if possible.
 927          */
 928
 929         if ((cur_placement & caching) != 0)
 930                 result |= (cur_placement & caching);
 931         else if ((man->default_caching & caching) != 0)
 932                 result |= man->default_caching;
 933         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 934                 result |= TTM_PL_FLAG_CACHED;
 935         else if ((TTM_PL_FLAG_WC & caching) != 0)
 936                 result |= TTM_PL_FLAG_WC;
 937         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 938                 result |= TTM_PL_FLAG_UNCACHED;
 939
 940         return result;
 941 }
 942
 943 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 944                                  uint32_t mem_type,
 945                                  const struct ttm_place *place,
 946                                  uint32_t *masked_placement)
 947 {
 948         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 949
 950         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 951                 return false;
 952
 953         if ((place->flags & man->available_caching) == 0)
 954                 return false;
 955
 956         cur_flags |= (place->flags & man->available_caching);
 957
 958         *masked_placement = cur_flags;
 959         return true;
 960 }
 961
 962 /**
 963  * Creates space for memory region @mem according to its type.
 964  *
 965  * This function first searches for free space in compatible memory types in
 966  * the priority order defined by the driver.  If free space isn't found, then
 967  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 968  * space.
 969  */
 970 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 971                         struct ttm_placement *placement,
 972                         struct ttm_mem_reg *mem,
 973                         struct ttm_operation_ctx *ctx)
 974 {
 975         struct ttm_bo_device *bdev = bo->bdev;
 976         struct ttm_mem_type_manager *man;
 977         uint32_t mem_type = TTM_PL_SYSTEM;
 978         uint32_t cur_flags = 0;
 979         bool type_found = false;
 980         bool type_ok = false;
 981         bool has_erestartsys = 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                         break;
1017
1018                 ret = (*man->func->get_node)(man, bo, place, mem);
1019                 if (unlikely(ret))
1020                         return ret;
1021
1022                 if (mem->mm_node) {
1023                         ret = ttm_bo_add_move_fence(bo, man, mem);
1024                         if (unlikely(ret)) {
1025                                 (*man->func->put_node)(man, mem);
1026                                 return ret;
1027                         }
1028                         break;
1029                 }
1030         }
1031
1032         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
1033                 mem->mem_type = mem_type;
1034                 mem->placement = cur_flags;
1035                 return 0;
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 == -ERESTARTSYS)
1073                         has_erestartsys = true;
1074         }
1075
1076         if (!type_found) {
1077                 pr_err(TTM_PFX "No compatible memory type found\n");
1078                 return -EINVAL;
1079         }
1080
1081         return (has_erestartsys) ? -ERESTARTSYS : -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 }