sys/dev/drm/ttm/ttm_bo.c

   1 /**************************************************************************
   2  *
   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  */
  30
  31 #define pr_fmt(fmt) "[TTM] " fmt
  32
  33 #include <drm/ttm/ttm_module.h>
  34 #include <drm/ttm/ttm_bo_driver.h>
  35 #include <drm/ttm/ttm_placement.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/slab.h>
  38 #include <linux/sched.h>
  39 #include <linux/mm.h>
  40 #include <linux/file.h>
  41 #include <linux/module.h>
  42 #include <linux/atomic.h>
  43 #include <linux/reservation.h>
  44
  45 #define TTM_ASSERT_LOCKED(param)
  46 #define TTM_DEBUG(fmt, arg...)
  47 #define TTM_BO_HASH_ORDER 13
  48
  49 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
  50 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  51
  52 static struct attribute ttm_bo_count = {
  53         .name = "bo_count",
  54         .mode = S_IRUGO
  55 };
  56
  57 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
  58                                           uint32_t *mem_type)
  59 {
  60         int i;
  61
  62         for (i = 0; i <= TTM_PL_PRIV5; i++) {
  63                 if (place->flags & (1 << i)) {
  64                         *mem_type = i;
  65                         return 0;
  66                 }
  67         }
  68         return -EINVAL;
  69 }
  70
  71 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  72 {
  73         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  74
  75         pr_err("    has_type: %d\n", man->has_type);
  76         pr_err("    use_type: %d\n", man->use_type);
  77         pr_err("    flags: 0x%08X\n", man->flags);
  78         pr_err("    gpu_offset: 0x%08lX\n", man->gpu_offset);
  79         pr_err("    size: %ju\n", man->size);
  80         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  81         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  82         if (mem_type != TTM_PL_SYSTEM)
  83                 (*man->func->debug)(man, TTM_PFX);
  84 }
  85
  86 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  87                                         struct ttm_placement *placement)
  88 {
  89         int i, ret, mem_type;
  90
  91         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  92                bo, bo->mem.num_pages, bo->mem.size >> 10,
  93                bo->mem.size >> 20);
  94         for (i = 0; i < placement->num_placement; i++) {
  95                 ret = ttm_mem_type_from_place(&placement->placement[i],
  96                                                 &mem_type);
  97                 if (ret)
  98                         return;
  99                 pr_err("  placement[%d]=0x%08X (%d)\n",
 100                        i, placement->placement[i].flags, mem_type);
 101                 ttm_mem_type_debug(bo->bdev, mem_type);
 102         }
 103 }
 104
 105 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 106                                   struct attribute *attr,
 107                                   char *buffer)
 108 {
 109         struct ttm_bo_global *glob =
 110                 container_of(kobj, struct ttm_bo_global, kobj);
 111
 112         return snprintf(buffer, PAGE_SIZE, "%lu\n",
 113                         (unsigned long) atomic_read(&glob->bo_count));
 114 }
 115
 116 static struct attribute *ttm_bo_global_attrs[] = {
 117         &ttm_bo_count,
 118         NULL
 119 };
 120
 121 static const struct sysfs_ops ttm_bo_global_ops = {
 122         .show = &ttm_bo_global_show
 123 };
 124
 125 static struct kobj_type ttm_bo_glob_kobj_type  = {
 126         .release = &ttm_bo_global_kobj_release,
 127         .sysfs_ops = &ttm_bo_global_ops,
 128         .default_attrs = ttm_bo_global_attrs
 129 };
 130
 131
 132 static inline uint32_t ttm_bo_type_flags(unsigned type)
 133 {
 134         return 1 << (type);
 135 }
 136
 137 static void ttm_bo_release_list(struct kref *list_kref)
 138 {
 139         struct ttm_buffer_object *bo =
 140             container_of(list_kref, struct ttm_buffer_object, list_kref);
 141         struct ttm_bo_device *bdev = bo->bdev;
 142         size_t acc_size = bo->acc_size;
 143
 144         BUG_ON(atomic_read(&bo->list_kref.refcount));
 145         BUG_ON(atomic_read(&bo->kref.refcount));
 146         BUG_ON(atomic_read(&bo->cpu_writers));
 147         BUG_ON(bo->mem.mm_node != NULL);
 148         BUG_ON(!list_empty(&bo->lru));
 149         BUG_ON(!list_empty(&bo->ddestroy));
 150
 151         if (bo->ttm)
 152                 ttm_tt_destroy(bo->ttm);
 153         atomic_dec(&bo->glob->bo_count);
 154         if (bo->resv == &bo->ttm_resv)
 155                 reservation_object_fini(&bo->ttm_resv);
 156         mutex_destroy(&bo->wu_mutex);
 157         if (bo->destroy)
 158                 bo->destroy(bo);
 159         else {
 160                 kfree(bo);
 161         }
 162         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 163 }
 164
 165 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 166 {
 167         struct ttm_bo_device *bdev = bo->bdev;
 168         struct ttm_mem_type_manager *man;
 169
 170         lockdep_assert_held(&bo->resv->lock.base);
 171
 172         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 173
 174                 BUG_ON(!list_empty(&bo->lru));
 175
 176                 man = &bdev->man[bo->mem.mem_type];
 177                 list_add_tail(&bo->lru, &man->lru);
 178                 kref_get(&bo->list_kref);
 179
 180                 if (bo->ttm != NULL) {
 181                         list_add_tail(&bo->swap, &bo->glob->swap_lru);
 182                         kref_get(&bo->list_kref);
 183                 }
 184         }
 185 }
 186 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 187
 188 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 189 {
 190         int put_count = 0;
 191
 192         if (!list_empty(&bo->swap)) {
 193                 list_del_init(&bo->swap);
 194                 ++put_count;
 195         }
 196         if (!list_empty(&bo->lru)) {
 197                 list_del_init(&bo->lru);
 198                 ++put_count;
 199         }
 200
 201         /*
 202          * TODO: Add a driver hook to delete from
 203          * driver-specific LRU's here.
 204          */
 205
 206         return put_count;
 207 }
 208
 209 static void ttm_bo_ref_bug(struct kref *list_kref)
 210 {
 211         BUG();
 212 }
 213
 214 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 215                          bool never_free)
 216 {
 217         kref_sub(&bo->list_kref, count,
 218                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 219 }
 220
 221 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 222 {
 223         int put_count;
 224
 225         lockmgr(&bo->glob->lru_lock, LK_EXCLUSIVE);
 226         put_count = ttm_bo_del_from_lru(bo);
 227         lockmgr(&bo->glob->lru_lock, LK_RELEASE);
 228         ttm_bo_list_ref_sub(bo, put_count, true);
 229 }
 230 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 231
 232 /*
 233  * Call bo->mutex locked.
 234  */
 235 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 236 {
 237         struct ttm_bo_device *bdev = bo->bdev;
 238         struct ttm_bo_global *glob = bo->glob;
 239         int ret = 0;
 240         uint32_t page_flags = 0;
 241
 242         TTM_ASSERT_LOCKED(&bo->mutex);
 243         bo->ttm = NULL;
 244
 245         if (bdev->need_dma32)
 246                 page_flags |= TTM_PAGE_FLAG_DMA32;
 247
 248         switch (bo->type) {
 249         case ttm_bo_type_device:
 250                 if (zero_alloc)
 251                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 252         case ttm_bo_type_kernel:
 253                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 254                                                       page_flags, glob->dummy_read_page);
 255                 if (unlikely(bo->ttm == NULL))
 256                         ret = -ENOMEM;
 257                 break;
 258         case ttm_bo_type_sg:
 259                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 260                                                       page_flags | TTM_PAGE_FLAG_SG,
 261                                                       glob->dummy_read_page);
 262                 if (unlikely(bo->ttm == NULL)) {
 263                         ret = -ENOMEM;
 264                         break;
 265                 }
 266                 bo->ttm->sg = bo->sg;
 267                 break;
 268         default:
 269                 pr_err("Illegal buffer object type\n");
 270                 ret = -EINVAL;
 271                 break;
 272         }
 273
 274         return ret;
 275 }
 276
 277 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 278                                   struct ttm_mem_reg *mem,
 279                                   bool evict, bool interruptible,
 280                                   bool no_wait_gpu)
 281 {
 282         struct ttm_bo_device *bdev = bo->bdev;
 283         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 284         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 285         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 286         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 287         int ret = 0;
 288
 289         if (old_is_pci || new_is_pci ||
 290             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 291                 ret = ttm_mem_io_lock(old_man, true);
 292                 if (unlikely(ret != 0))
 293                         goto out_err;
 294                 ttm_bo_unmap_virtual_locked(bo);
 295                 ttm_mem_io_unlock(old_man);
 296         }
 297
 298         /*
 299          * Create and bind a ttm if required.
 300          */
 301
 302         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 303                 if (bo->ttm == NULL) {
 304                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 305                         ret = ttm_bo_add_ttm(bo, zero);
 306                         if (ret)
 307                                 goto out_err;
 308                 }
 309
 310                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 311                 if (ret)
 312                         goto out_err;
 313
 314                 if (mem->mem_type != TTM_PL_SYSTEM) {
 315                         ret = ttm_tt_bind(bo->ttm, mem);
 316                         if (ret)
 317                                 goto out_err;
 318                 }
 319
 320                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 321                         if (bdev->driver->move_notify)
 322                                 bdev->driver->move_notify(bo, mem);
 323                         bo->mem = *mem;
 324                         mem->mm_node = NULL;
 325                         goto moved;
 326                 }
 327         }
 328
 329         if (bdev->driver->move_notify)
 330                 bdev->driver->move_notify(bo, mem);
 331
 332         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 333             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 334                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 335         else if (bdev->driver->move)
 336                 ret = bdev->driver->move(bo, evict, interruptible,
 337                                          no_wait_gpu, mem);
 338         else
 339                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 340
 341         if (ret) {
 342                 if (bdev->driver->move_notify) {
 343                         struct ttm_mem_reg tmp_mem = *mem;
 344                         *mem = bo->mem;
 345                         bo->mem = tmp_mem;
 346                         bdev->driver->move_notify(bo, mem);
 347                         bo->mem = *mem;
 348                         *mem = tmp_mem;
 349                 }
 350
 351                 goto out_err;
 352         }
 353
 354 moved:
 355         if (bo->evicted) {
 356                 if (bdev->driver->invalidate_caches) {
 357                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 358                         if (ret)
 359                                 pr_err("Can not flush read caches\n");
 360                 }
 361                 bo->evicted = false;
 362         }
 363
 364         if (bo->mem.mm_node) {
 365                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 366                     bdev->man[bo->mem.mem_type].gpu_offset;
 367                 bo->cur_placement = bo->mem.placement;
 368         } else
 369                 bo->offset = 0;
 370
 371         return 0;
 372
 373 out_err:
 374         new_man = &bdev->man[bo->mem.mem_type];
 375         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 376                 ttm_tt_unbind(bo->ttm);
 377                 ttm_tt_destroy(bo->ttm);
 378                 bo->ttm = NULL;
 379         }
 380
 381         return ret;
 382 }
 383
 384 /**
 385  * Call bo::reserved.
 386  * Will release GPU memory type usage on destruction.
 387  * This is the place to put in driver specific hooks to release
 388  * driver private resources.
 389  * Will release the bo::reserved lock.
 390  */
 391
 392 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 393 {
 394         if (bo->bdev->driver->move_notify)
 395                 bo->bdev->driver->move_notify(bo, NULL);
 396
 397         if (bo->ttm) {
 398                 ttm_tt_unbind(bo->ttm);
 399                 ttm_tt_destroy(bo->ttm);
 400                 bo->ttm = NULL;
 401         }
 402         ttm_bo_mem_put(bo, &bo->mem);
 403
 404         ww_mutex_unlock (&bo->resv->lock);
 405 }
 406
 407 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 408 {
 409         struct reservation_object_list *fobj;
 410         struct fence *fence;
 411         int i;
 412
 413         fobj = reservation_object_get_list(bo->resv);
 414         fence = reservation_object_get_excl(bo->resv);
 415         if (fence && !fence->ops->signaled)
 416                 fence_enable_sw_signaling(fence);
 417
 418         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 419                 fence = rcu_dereference_protected(fobj->shared[i],
 420                                         reservation_object_held(bo->resv));
 421
 422                 if (!fence->ops->signaled)
 423                         fence_enable_sw_signaling(fence);
 424         }
 425 }
 426
 427 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 428 {
 429         struct ttm_bo_device *bdev = bo->bdev;
 430         struct ttm_bo_global *glob = bo->glob;
 431         int put_count;
 432         int ret;
 433
 434         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 435         ret = __ttm_bo_reserve(bo, false, true, false, NULL);
 436
 437         if (!ret) {
 438                 if (!ttm_bo_wait(bo, false, false, true)) {
 439                         put_count = ttm_bo_del_from_lru(bo);
 440
 441                         lockmgr(&glob->lru_lock, LK_RELEASE);
 442                         ttm_bo_cleanup_memtype_use(bo);
 443
 444                         ttm_bo_list_ref_sub(bo, put_count, true);
 445
 446                         return;
 447                 } else
 448                         ttm_bo_flush_all_fences(bo);
 449
 450                 /*
 451                  * Make NO_EVICT bos immediately available to
 452                  * shrinkers, now that they are queued for
 453                  * destruction.
 454                  */
 455                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 456                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 457                         ttm_bo_add_to_lru(bo);
 458                 }
 459
 460                 __ttm_bo_unreserve(bo);
 461         }
 462
 463         kref_get(&bo->list_kref);
 464         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 465         lockmgr(&glob->lru_lock, LK_RELEASE);
 466
 467         schedule_delayed_work(&bdev->wq,
 468                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 469 }
 470
 471 /**
 472  * function ttm_bo_cleanup_refs_and_unlock
 473  * If bo idle, remove from delayed- and lru lists, and unref.
 474  * If not idle, do nothing.
 475  *
 476  * Must be called with lru_lock and reservation held, this function
 477  * will drop both before returning.
 478  *
 479  * @interruptible         Any sleeps should occur interruptibly.
 480  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 481  */
 482
 483 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 484                                           bool interruptible,
 485                                           bool no_wait_gpu)
 486 {
 487         struct ttm_bo_global *glob = bo->glob;
 488         int put_count;
 489         int ret;
 490
 491         ret = ttm_bo_wait(bo, false, false, true);
 492
 493         if (ret && !no_wait_gpu) {
 494                 long lret;
 495                 ww_mutex_unlock(&bo->resv->lock);
 496                 lockmgr(&glob->lru_lock, LK_RELEASE);
 497
 498                 lret = reservation_object_wait_timeout_rcu(bo->resv,
 499                                                            true,
 500                                                            interruptible,
 501                                                            30 * HZ);
 502
 503                 if (lret < 0)
 504                         return lret;
 505                 else if (lret == 0)
 506                         return -EBUSY;
 507
 508                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 509                 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
 510
 511                 /*
 512                  * We raced, and lost, someone else holds the reservation now,
 513                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 514                  *
 515                  * Even if it's not the case, because we finished waiting any
 516                  * delayed destruction would succeed, so just return success
 517                  * here.
 518                  */
 519                 if (ret) {
 520                         lockmgr(&glob->lru_lock, LK_RELEASE);
 521                         return 0;
 522                 }
 523
 524                 /*
 525                  * remove sync_obj with ttm_bo_wait, the wait should be
 526                  * finished, and no new wait object should have been added.
 527                  */
 528                 ret = ttm_bo_wait(bo, false, false, true);
 529                 WARN_ON(ret);
 530         }
 531
 532         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 533                 __ttm_bo_unreserve(bo);
 534                 lockmgr(&glob->lru_lock, LK_RELEASE);
 535                 return ret;
 536         }
 537
 538         put_count = ttm_bo_del_from_lru(bo);
 539         list_del_init(&bo->ddestroy);
 540         ++put_count;
 541
 542         lockmgr(&glob->lru_lock, LK_RELEASE);
 543         ttm_bo_cleanup_memtype_use(bo);
 544
 545         ttm_bo_list_ref_sub(bo, put_count, true);
 546
 547         return 0;
 548 }
 549
 550 /**
 551  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 552  * encountered buffers.
 553  */
 554
 555 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 556 {
 557         struct ttm_bo_global *glob = bdev->glob;
 558         struct ttm_buffer_object *entry = NULL;
 559         int ret = 0;
 560
 561         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 562         if (list_empty(&bdev->ddestroy))
 563                 goto out_unlock;
 564
 565         entry = list_first_entry(&bdev->ddestroy,
 566                 struct ttm_buffer_object, ddestroy);
 567         kref_get(&entry->list_kref);
 568
 569         for (;;) {
 570                 struct ttm_buffer_object *nentry = NULL;
 571
 572                 if (entry->ddestroy.next != &bdev->ddestroy) {
 573                         nentry = list_first_entry(&entry->ddestroy,
 574                                 struct ttm_buffer_object, ddestroy);
 575                         kref_get(&nentry->list_kref);
 576                 }
 577
 578                 ret = __ttm_bo_reserve(entry, false, true, false, 0);
 579                 if (remove_all && ret) {
 580                         lockmgr(&glob->lru_lock, LK_RELEASE);
 581                         ret = __ttm_bo_reserve(entry, false, false,
 582                                                false, 0);
 583                         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 584                 }
 585
 586                 if (!ret)
 587                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 588                                                              !remove_all);
 589                 else
 590                         lockmgr(&glob->lru_lock, LK_RELEASE);
 591
 592                 kref_put(&entry->list_kref, ttm_bo_release_list);
 593                 entry = nentry;
 594
 595                 if (ret || !entry)
 596                         goto out;
 597
 598                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 599                 if (list_empty(&entry->ddestroy))
 600                         break;
 601         }
 602
 603 out_unlock:
 604         lockmgr(&glob->lru_lock, LK_RELEASE);
 605 out:
 606         if (entry)
 607                 kref_put(&entry->list_kref, ttm_bo_release_list);
 608         return ret;
 609 }
 610
 611 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 612 {
 613         struct ttm_bo_device *bdev =
 614             container_of(work, struct ttm_bo_device, wq.work);
 615
 616         if (ttm_bo_delayed_delete(bdev, false)) {
 617                 schedule_delayed_work(&bdev->wq,
 618                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 619         }
 620 }
 621
 622 static void ttm_bo_release(struct kref *kref)
 623 {
 624         struct ttm_buffer_object *bo =
 625             container_of(kref, struct ttm_buffer_object, kref);
 626         struct ttm_bo_device *bdev = bo->bdev;
 627         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 628
 629         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 630         ttm_mem_io_lock(man, false);
 631         ttm_mem_io_free_vm(bo);
 632         ttm_mem_io_unlock(man);
 633         ttm_bo_cleanup_refs_or_queue(bo);
 634         kref_put(&bo->list_kref, ttm_bo_release_list);
 635 }
 636
 637 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 638 {
 639         struct ttm_buffer_object *bo = *p_bo;
 640
 641         *p_bo = NULL;
 642         kref_put(&bo->kref, ttm_bo_release);
 643 }
 644 EXPORT_SYMBOL(ttm_bo_unref);
 645
 646 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 647 {
 648         return cancel_delayed_work_sync(&bdev->wq);
 649 }
 650 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 651
 652 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 653 {
 654         if (resched)
 655                 schedule_delayed_work(&bdev->wq,
 656                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 657 }
 658 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 659
 660 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 661                         bool no_wait_gpu)
 662 {
 663         struct ttm_bo_device *bdev = bo->bdev;
 664         struct ttm_mem_reg evict_mem;
 665         struct ttm_placement placement;
 666         int ret = 0;
 667
 668         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 669
 670         if (unlikely(ret != 0)) {
 671                 if (ret != -ERESTARTSYS) {
 672                         pr_err("Failed to expire sync object before buffer eviction\n");
 673                 }
 674                 goto out;
 675         }
 676
 677         lockdep_assert_held(&bo->resv->lock.base);
 678
 679         evict_mem = bo->mem;
 680         evict_mem.mm_node = NULL;
 681         evict_mem.bus.io_reserved_vm = false;
 682         evict_mem.bus.io_reserved_count = 0;
 683
 684         placement.num_placement = 0;
 685         placement.num_busy_placement = 0;
 686         bdev->driver->evict_flags(bo, &placement);
 687         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 688                                 no_wait_gpu);
 689         if (ret) {
 690                 if (ret != -ERESTARTSYS) {
 691                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 692                                bo);
 693                         ttm_bo_mem_space_debug(bo, &placement);
 694                 }
 695                 goto out;
 696         }
 697
 698         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 699                                      no_wait_gpu);
 700         if (ret) {
 701                 if (ret != -ERESTARTSYS)
 702                         pr_err("Buffer eviction failed\n");
 703                 ttm_bo_mem_put(bo, &evict_mem);
 704                 goto out;
 705         }
 706         bo->evicted = true;
 707 out:
 708         return ret;
 709 }
 710
 711 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 712                                 uint32_t mem_type,
 713                                 const struct ttm_place *place,
 714                                 bool interruptible,
 715                                 bool no_wait_gpu)
 716 {
 717         struct ttm_bo_global *glob = bdev->glob;
 718         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 719         struct ttm_buffer_object *bo;
 720         int ret = -EBUSY, put_count;
 721
 722         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 723         list_for_each_entry(bo, &man->lru, lru) {
 724                 ret = __ttm_bo_reserve(bo, false, true, false, NULL);
 725                 if (!ret) {
 726                         if (place && (place->fpfn || place->lpfn)) {
 727                                 /* Don't evict this BO if it's outside of the
 728                                  * requested placement range
 729                                  */
 730                                 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 731                                     (place->lpfn && place->lpfn <= bo->mem.start)) {
 732                                         __ttm_bo_unreserve(bo);
 733                                         ret = -EBUSY;
 734                                         continue;
 735                                 }
 736                         }
 737
 738                         break;
 739                 }
 740         }
 741
 742         if (ret) {
 743                 lockmgr(&glob->lru_lock, LK_RELEASE);
 744                 return ret;
 745         }
 746
 747         kref_get(&bo->list_kref);
 748
 749         if (!list_empty(&bo->ddestroy)) {
 750                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 751                                                      no_wait_gpu);
 752                 kref_put(&bo->list_kref, ttm_bo_release_list);
 753                 return ret;
 754         }
 755
 756         put_count = ttm_bo_del_from_lru(bo);
 757         lockmgr(&glob->lru_lock, LK_RELEASE);
 758
 759         BUG_ON(ret != 0);
 760
 761         ttm_bo_list_ref_sub(bo, put_count, true);
 762
 763         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 764         ttm_bo_unreserve(bo);
 765
 766         kref_put(&bo->list_kref, ttm_bo_release_list);
 767         return ret;
 768 }
 769
 770 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 771 {
 772         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 773
 774         if (mem->mm_node)
 775                 (*man->func->put_node)(man, mem);
 776 }
 777 EXPORT_SYMBOL(ttm_bo_mem_put);
 778
 779 /**
 780  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 781  * space, or we've evicted everything and there isn't enough space.
 782  */
 783 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 784                                         uint32_t mem_type,
 785                                         const struct ttm_place *place,
 786                                         struct ttm_mem_reg *mem,
 787                                         bool interruptible,
 788                                         bool no_wait_gpu)
 789 {
 790         struct ttm_bo_device *bdev = bo->bdev;
 791         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 792         int ret;
 793
 794         do {
 795                 ret = (*man->func->get_node)(man, bo, place, mem);
 796                 if (unlikely(ret != 0))
 797                         return ret;
 798                 if (mem->mm_node)
 799                         break;
 800                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 801                                           interruptible, no_wait_gpu);
 802                 if (unlikely(ret != 0))
 803                         return ret;
 804         } while (1);
 805         if (mem->mm_node == NULL)
 806                 return -ENOMEM;
 807         mem->mem_type = mem_type;
 808         return 0;
 809 }
 810
 811 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 812                                       uint32_t cur_placement,
 813                                       uint32_t proposed_placement)
 814 {
 815         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 816         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 817
 818         /**
 819          * Keep current caching if possible.
 820          */
 821
 822         if ((cur_placement & caching) != 0)
 823                 result |= (cur_placement & caching);
 824         else if ((man->default_caching & caching) != 0)
 825                 result |= man->default_caching;
 826         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 827                 result |= TTM_PL_FLAG_CACHED;
 828         else if ((TTM_PL_FLAG_WC & caching) != 0)
 829                 result |= TTM_PL_FLAG_WC;
 830         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 831                 result |= TTM_PL_FLAG_UNCACHED;
 832
 833         return result;
 834 }
 835
 836 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 837                                  uint32_t mem_type,
 838                                  const struct ttm_place *place,
 839                                  uint32_t *masked_placement)
 840 {
 841         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 842
 843         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 844                 return false;
 845
 846         if ((place->flags & man->available_caching) == 0)
 847                 return false;
 848
 849         cur_flags |= (place->flags & man->available_caching);
 850
 851         *masked_placement = cur_flags;
 852         return true;
 853 }
 854
 855 /**
 856  * Creates space for memory region @mem according to its type.
 857  *
 858  * This function first searches for free space in compatible memory types in
 859  * the priority order defined by the driver.  If free space isn't found, then
 860  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 861  * space.
 862  */
 863 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 864                         struct ttm_placement *placement,
 865                         struct ttm_mem_reg *mem,
 866                         bool interruptible,
 867                         bool no_wait_gpu)
 868 {
 869         struct ttm_bo_device *bdev = bo->bdev;
 870         struct ttm_mem_type_manager *man;
 871         uint32_t mem_type = TTM_PL_SYSTEM;
 872         uint32_t cur_flags = 0;
 873         bool type_found = false;
 874         bool type_ok = false;
 875         bool has_erestartsys = false;
 876         int i, ret;
 877
 878         mem->mm_node = NULL;
 879         for (i = 0; i < placement->num_placement; ++i) {
 880                 const struct ttm_place *place = &placement->placement[i];
 881
 882                 ret = ttm_mem_type_from_place(place, &mem_type);
 883                 if (ret)
 884                         return ret;
 885                 man = &bdev->man[mem_type];
 886
 887                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 888                                                 &cur_flags);
 889
 890                 if (!type_ok)
 891                         continue;
 892
 893                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 894                                                   cur_flags);
 895                 /*
 896                  * Use the access and other non-mapping-related flag bits from
 897                  * the memory placement flags to the current flags
 898                  */
 899                 ttm_flag_masked(&cur_flags, place->flags,
 900                                 ~TTM_PL_MASK_MEMTYPE);
 901
 902                 if (mem_type == TTM_PL_SYSTEM)
 903                         break;
 904
 905                 if (man->has_type && man->use_type) {
 906                         type_found = true;
 907                         ret = (*man->func->get_node)(man, bo, place, mem);
 908                         if (unlikely(ret))
 909                                 return ret;
 910                 }
 911                 if (mem->mm_node)
 912                         break;
 913         }
 914
 915         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 916                 mem->mem_type = mem_type;
 917                 mem->placement = cur_flags;
 918                 return 0;
 919         }
 920
 921         if (!type_found)
 922                 return -EINVAL;
 923
 924         for (i = 0; i < placement->num_busy_placement; ++i) {
 925                 const struct ttm_place *place = &placement->busy_placement[i];
 926
 927                 ret = ttm_mem_type_from_place(place, &mem_type);
 928                 if (ret)
 929                         return ret;
 930                 man = &bdev->man[mem_type];
 931                 if (!man->has_type)
 932                         continue;
 933                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 934                         continue;
 935
 936                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 937                                                   cur_flags);
 938                 /*
 939                  * Use the access and other non-mapping-related flag bits from
 940                  * the memory placement flags to the current flags
 941                  */
 942                 ttm_flag_masked(&cur_flags, place->flags,
 943                                 ~TTM_PL_MASK_MEMTYPE);
 944
 945                 if (mem_type == TTM_PL_SYSTEM) {
 946                         mem->mem_type = mem_type;
 947                         mem->placement = cur_flags;
 948                         mem->mm_node = NULL;
 949                         return 0;
 950                 }
 951
 952                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
 953                                                 interruptible, no_wait_gpu);
 954                 if (ret == 0 && mem->mm_node) {
 955                         mem->placement = cur_flags;
 956                         return 0;
 957                 }
 958                 if (ret == -ERESTARTSYS)
 959                         has_erestartsys = true;
 960         }
 961         ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
 962         return ret;
 963 }
 964 EXPORT_SYMBOL(ttm_bo_mem_space);
 965
 966 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 967                         struct ttm_placement *placement,
 968                         bool interruptible,
 969                         bool no_wait_gpu)
 970 {
 971         int ret = 0;
 972         struct ttm_mem_reg mem;
 973
 974         lockdep_assert_held(&bo->resv->lock.base);
 975
 976         /*
 977          * FIXME: It's possible to pipeline buffer moves.
 978          * Have the driver move function wait for idle when necessary,
 979          * instead of doing it here.
 980          */
 981         ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
 982         if (ret)
 983                 return ret;
 984         mem.num_pages = bo->num_pages;
 985         mem.size = mem.num_pages << PAGE_SHIFT;
 986         mem.page_alignment = bo->mem.page_alignment;
 987         mem.bus.io_reserved_vm = false;
 988         mem.bus.io_reserved_count = 0;
 989         /*
 990          * Determine where to move the buffer.
 991          */
 992         ret = ttm_bo_mem_space(bo, placement, &mem,
 993                                interruptible, no_wait_gpu);
 994         if (ret)
 995                 goto out_unlock;
 996         ret = ttm_bo_handle_move_mem(bo, &mem, false,
 997                                      interruptible, no_wait_gpu);
 998 out_unlock:
 999         if (ret && mem.mm_node)
1000                 ttm_bo_mem_put(bo, &mem);
1001         return ret;
1002 }
1003
1004 static bool ttm_bo_mem_compat(struct ttm_placement *placement,
1005                               struct ttm_mem_reg *mem,
1006                               uint32_t *new_flags)
1007 {
1008         int i;
1009
1010         for (i = 0; i < placement->num_placement; i++) {
1011                 const struct ttm_place *heap = &placement->placement[i];
1012                 if (mem->mm_node &&
1013                     (mem->start < heap->fpfn ||
1014                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1015                         continue;
1016
1017                 *new_flags = heap->flags;
1018                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1019                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1020                         return true;
1021         }
1022
1023         for (i = 0; i < placement->num_busy_placement; i++) {
1024                 const struct ttm_place *heap = &placement->busy_placement[i];
1025                 if (mem->mm_node &&
1026                     (mem->start < heap->fpfn ||
1027                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1028                         continue;
1029
1030                 *new_flags = heap->flags;
1031                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1032                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1033                         return true;
1034         }
1035
1036         return false;
1037 }
1038
1039 int ttm_bo_validate(struct ttm_buffer_object *bo,
1040                         struct ttm_placement *placement,
1041                         bool interruptible,
1042                         bool no_wait_gpu)
1043 {
1044         int ret;
1045         uint32_t new_flags;
1046
1047         lockdep_assert_held(&bo->resv->lock.base);
1048         /*
1049          * Check whether we need to move buffer.
1050          */
1051         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1052                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1053                                          no_wait_gpu);
1054                 if (ret)
1055                         return ret;
1056         } else {
1057                 /*
1058                  * Use the access and other non-mapping-related flag bits from
1059                  * the compatible memory placement flags to the active flags
1060                  */
1061                 ttm_flag_masked(&bo->mem.placement, new_flags,
1062                                 ~TTM_PL_MASK_MEMTYPE);
1063         }
1064         /*
1065          * We might need to add a TTM.
1066          */
1067         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1068                 ret = ttm_bo_add_ttm(bo, true);
1069                 if (ret)
1070                         return ret;
1071         }
1072         return 0;
1073 }
1074 EXPORT_SYMBOL(ttm_bo_validate);
1075
1076 int ttm_bo_init(struct ttm_bo_device *bdev,
1077                 struct ttm_buffer_object *bo,
1078                 unsigned long size,
1079                 enum ttm_bo_type type,
1080                 struct ttm_placement *placement,
1081                 uint32_t page_alignment,
1082                 bool interruptible,
1083                 struct vm_object *persistent_swap_storage,
1084                 size_t acc_size,
1085                 struct sg_table *sg,
1086                 struct reservation_object *resv,
1087                 void (*destroy) (struct ttm_buffer_object *))
1088 {
1089         int ret = 0;
1090         unsigned long num_pages;
1091         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1092         bool locked;
1093
1094         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1095         if (ret) {
1096                 pr_err("Out of kernel memory\n");
1097                 if (destroy)
1098                         (*destroy)(bo);
1099                 else
1100                         kfree(bo);
1101                 return -ENOMEM;
1102         }
1103
1104         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1105         if (num_pages == 0) {
1106                 pr_err("Illegal buffer object size\n");
1107                 if (destroy)
1108                         (*destroy)(bo);
1109                 else
1110                         kfree(bo);
1111                 ttm_mem_global_free(mem_glob, acc_size);
1112                 return -EINVAL;
1113         }
1114         bo->destroy = destroy;
1115
1116         kref_init(&bo->kref);
1117         kref_init(&bo->list_kref);
1118         atomic_set(&bo->cpu_writers, 0);
1119         INIT_LIST_HEAD(&bo->lru);
1120         INIT_LIST_HEAD(&bo->ddestroy);
1121         INIT_LIST_HEAD(&bo->swap);
1122         INIT_LIST_HEAD(&bo->io_reserve_lru);
1123         lockinit(&bo->wu_mutex, "ttmbwm", 0, LK_CANRECURSE);
1124         bo->bdev = bdev;
1125         bo->glob = bdev->glob;
1126         bo->type = type;
1127         bo->num_pages = num_pages;
1128         bo->mem.size = num_pages << PAGE_SHIFT;
1129         bo->mem.mem_type = TTM_PL_SYSTEM;
1130         bo->mem.num_pages = bo->num_pages;
1131         bo->mem.mm_node = NULL;
1132         bo->mem.page_alignment = page_alignment;
1133         bo->mem.bus.io_reserved_vm = false;
1134         bo->mem.bus.io_reserved_count = 0;
1135         bo->priv_flags = 0;
1136         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1137         bo->persistent_swap_storage = persistent_swap_storage;
1138         bo->acc_size = acc_size;
1139         bo->sg = sg;
1140         if (resv) {
1141                 bo->resv = resv;
1142                 lockdep_assert_held(&bo->resv->lock.base);
1143         } else {
1144                 bo->resv = &bo->ttm_resv;
1145                 reservation_object_init(&bo->ttm_resv);
1146         }
1147         atomic_inc(&bo->glob->bo_count);
1148         drm_vma_node_reset(&bo->vma_node);
1149
1150         /*
1151          * For ttm_bo_type_device buffers, allocate
1152          * address space from the device.
1153          */
1154         if (bo->type == ttm_bo_type_device ||
1155             bo->type == ttm_bo_type_sg)
1156                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1157                                          bo->mem.num_pages);
1158
1159         /* passed reservation objects should already be locked,
1160          * since otherwise lockdep will be angered in radeon.
1161          */
1162         if (!resv) {
1163                 locked = ww_mutex_trylock(&bo->resv->lock);
1164                 WARN_ON(!locked);
1165         }
1166
1167         if (likely(!ret))
1168                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1169
1170         if (!resv)
1171                 ttm_bo_unreserve(bo);
1172
1173         if (unlikely(ret))
1174                 ttm_bo_unref(&bo);
1175
1176         return ret;
1177 }
1178 EXPORT_SYMBOL(ttm_bo_init);
1179
1180 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1181                        unsigned long bo_size,
1182                        unsigned struct_size)
1183 {
1184         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1185         size_t size = 0;
1186
1187         size += ttm_round_pot(struct_size);
1188         size += PAGE_ALIGN(npages * sizeof(void *));
1189         size += ttm_round_pot(sizeof(struct ttm_tt));
1190         return size;
1191 }
1192 EXPORT_SYMBOL(ttm_bo_acc_size);
1193
1194 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1195                            unsigned long bo_size,
1196                            unsigned struct_size)
1197 {
1198         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1199         size_t size = 0;
1200
1201         size += ttm_round_pot(struct_size);
1202         size += PAGE_ALIGN(npages * sizeof(void *));
1203         size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
1204         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1205         return size;
1206 }
1207 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1208
1209 int ttm_bo_create(struct ttm_bo_device *bdev,
1210                         unsigned long size,
1211                         enum ttm_bo_type type,
1212                         struct ttm_placement *placement,
1213                         uint32_t page_alignment,
1214                         bool interruptible,
1215                         struct vm_object *persistent_swap_storage,
1216                         struct ttm_buffer_object **p_bo)
1217 {
1218         struct ttm_buffer_object *bo;
1219         size_t acc_size;
1220         int ret;
1221
1222         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1223         if (unlikely(bo == NULL))
1224                 return -ENOMEM;
1225
1226         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1227         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1228                           interruptible, persistent_swap_storage, acc_size,
1229                           NULL, NULL, NULL);
1230         if (likely(ret == 0))
1231                 *p_bo = bo;
1232
1233         return ret;
1234 }
1235 EXPORT_SYMBOL(ttm_bo_create);
1236
1237 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1238                                         unsigned mem_type, bool allow_errors)
1239 {
1240         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1241         struct ttm_bo_global *glob = bdev->glob;
1242         int ret;
1243
1244         /*
1245          * Can't use standard list traversal since we're unlocking.
1246          */
1247
1248         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1249         while (!list_empty(&man->lru)) {
1250                 lockmgr(&glob->lru_lock, LK_RELEASE);
1251                 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1252                 if (ret) {
1253                         if (allow_errors) {
1254                                 return ret;
1255                         } else {
1256                                 pr_err("Cleanup eviction failed\n");
1257                         }
1258                 }
1259                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1260         }
1261         lockmgr(&glob->lru_lock, LK_RELEASE);
1262         return 0;
1263 }
1264
1265 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1266 {
1267         struct ttm_mem_type_manager *man;
1268         int ret = -EINVAL;
1269
1270         if (mem_type >= TTM_NUM_MEM_TYPES) {
1271                 pr_err("Illegal memory type %d\n", mem_type);
1272                 return ret;
1273         }
1274         man = &bdev->man[mem_type];
1275
1276         if (!man->has_type) {
1277                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1278                        mem_type);
1279                 return ret;
1280         }
1281
1282         man->use_type = false;
1283         man->has_type = false;
1284
1285         ret = 0;
1286         if (mem_type > 0) {
1287                 ttm_bo_force_list_clean(bdev, mem_type, false);
1288
1289                 ret = (*man->func->takedown)(man);
1290         }
1291
1292         return ret;
1293 }
1294 EXPORT_SYMBOL(ttm_bo_clean_mm);
1295
1296 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1297 {
1298         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1299
1300         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1301                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1302                 return -EINVAL;
1303         }
1304
1305         if (!man->has_type) {
1306                 pr_err("Memory type %u has not been initialized\n", mem_type);
1307                 return 0;
1308         }
1309
1310         return ttm_bo_force_list_clean(bdev, mem_type, true);
1311 }
1312 EXPORT_SYMBOL(ttm_bo_evict_mm);
1313
1314 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1315                         unsigned long p_size)
1316 {
1317         int ret = -EINVAL;
1318         struct ttm_mem_type_manager *man;
1319
1320         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1321         man = &bdev->man[type];
1322         BUG_ON(man->has_type);
1323         man->io_reserve_fastpath = true;
1324         man->use_io_reserve_lru = false;
1325         lockinit(&man->io_reserve_mutex, "ttmior", 0, 0);
1326         INIT_LIST_HEAD(&man->io_reserve_lru);
1327
1328         ret = bdev->driver->init_mem_type(bdev, type, man);
1329         if (ret)
1330                 return ret;
1331         man->bdev = bdev;
1332
1333         ret = 0;
1334         if (type != TTM_PL_SYSTEM) {
1335                 ret = (*man->func->init)(man, p_size);
1336                 if (ret)
1337                         return ret;
1338         }
1339         man->has_type = true;
1340         man->use_type = true;
1341         man->size = p_size;
1342
1343         INIT_LIST_HEAD(&man->lru);
1344
1345         return 0;
1346 }
1347 EXPORT_SYMBOL(ttm_bo_init_mm);
1348
1349 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1350 {
1351         struct ttm_bo_global *glob =
1352                 container_of(kobj, struct ttm_bo_global, kobj);
1353
1354         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1355         __free_page(glob->dummy_read_page);
1356         kfree(glob);
1357 }
1358
1359 void ttm_bo_global_release(struct drm_global_reference *ref)
1360 {
1361         struct ttm_bo_global *glob = ref->object;
1362
1363         kobject_del(&glob->kobj);
1364         kobject_put(&glob->kobj);
1365 }
1366 EXPORT_SYMBOL(ttm_bo_global_release);
1367
1368 int ttm_bo_global_init(struct drm_global_reference *ref)
1369 {
1370         struct ttm_bo_global_ref *bo_ref =
1371                 container_of(ref, struct ttm_bo_global_ref, ref);
1372         struct ttm_bo_global *glob = ref->object;
1373         int ret;
1374
1375         lockinit(&glob->device_list_mutex, "ttmdlm", 0, 0);
1376         lockinit(&glob->lru_lock, "ttmlru", 0, 0);
1377         glob->mem_glob = bo_ref->mem_glob;
1378         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1379
1380         if (unlikely(glob->dummy_read_page == NULL)) {
1381                 ret = -ENOMEM;
1382                 goto out_no_drp;
1383         }
1384
1385         INIT_LIST_HEAD(&glob->swap_lru);
1386         INIT_LIST_HEAD(&glob->device_list);
1387
1388         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1389         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1390         if (unlikely(ret != 0)) {
1391                 pr_err("Could not register buffer object swapout\n");
1392                 goto out_no_shrink;
1393         }
1394
1395         atomic_set(&glob->bo_count, 0);
1396
1397         ret = kobject_init_and_add(
1398                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1399         if (unlikely(ret != 0))
1400                 kobject_put(&glob->kobj);
1401         return ret;
1402 out_no_shrink:
1403         __free_page(glob->dummy_read_page);
1404 out_no_drp:
1405         kfree(glob);
1406         return ret;
1407 }
1408 EXPORT_SYMBOL(ttm_bo_global_init);
1409
1410
1411 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1412 {
1413         int ret = 0;
1414         unsigned i = TTM_NUM_MEM_TYPES;
1415         struct ttm_mem_type_manager *man;
1416         struct ttm_bo_global *glob = bdev->glob;
1417
1418         while (i--) {
1419                 man = &bdev->man[i];
1420                 if (man->has_type) {
1421                         man->use_type = false;
1422                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1423                                 ret = -EBUSY;
1424                                 pr_err("DRM memory manager type %d is not clean\n",
1425                                        i);
1426                         }
1427                         man->has_type = false;
1428                 }
1429         }
1430
1431         mutex_lock(&glob->device_list_mutex);
1432         list_del(&bdev->device_list);
1433         mutex_unlock(&glob->device_list_mutex);
1434
1435         cancel_delayed_work_sync(&bdev->wq);
1436
1437         while (ttm_bo_delayed_delete(bdev, true))
1438                 ;
1439
1440         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1441         if (list_empty(&bdev->ddestroy))
1442                 TTM_DEBUG("Delayed destroy list was clean\n");
1443
1444         if (list_empty(&bdev->man[0].lru))
1445                 TTM_DEBUG("Swap list was clean\n");
1446         lockmgr(&glob->lru_lock, LK_RELEASE);
1447
1448         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1449
1450         return ret;
1451 }
1452 EXPORT_SYMBOL(ttm_bo_device_release);
1453
1454 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1455                        struct ttm_bo_global *glob,
1456                        struct ttm_bo_driver *driver,
1457                        struct address_space *mapping,
1458                        uint64_t file_page_offset,
1459                        bool need_dma32)
1460 {
1461         int ret = -EINVAL;
1462
1463         bdev->driver = driver;
1464
1465         memset(bdev->man, 0, sizeof(bdev->man));
1466
1467         /*
1468          * Initialize the system memory buffer type.
1469          * Other types need to be driver / IOCTL initialized.
1470          */
1471         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1472         if (unlikely(ret != 0))
1473                 goto out_no_sys;
1474
1475         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1476                                     0x10000000);
1477         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1478         INIT_LIST_HEAD(&bdev->ddestroy);
1479         /*
1480          * XXX DRAGONFLY - dev_mapping NULL atm, find other XXX DRAGONFLY
1481          * lines and fix when it no longer is in later API change.
1482          */
1483         bdev->dev_mapping = mapping;
1484         bdev->glob = glob;
1485         bdev->need_dma32 = need_dma32;
1486         bdev->val_seq = 0;
1487         mutex_lock(&glob->device_list_mutex);
1488         list_add_tail(&bdev->device_list, &glob->device_list);
1489         mutex_unlock(&glob->device_list_mutex);
1490
1491         return 0;
1492 out_no_sys:
1493         return ret;
1494 }
1495 EXPORT_SYMBOL(ttm_bo_device_init);
1496
1497 /*
1498  * buffer object vm functions.
1499  */
1500
1501 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1502 {
1503         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1504
1505         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1506                 if (mem->mem_type == TTM_PL_SYSTEM)
1507                         return false;
1508
1509                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1510                         return false;
1511
1512                 if (mem->placement & TTM_PL_FLAG_CACHED)
1513                         return false;
1514         }
1515         return true;
1516 }
1517
1518 #ifdef __DragonFly__
1519
1520 /*
1521  * XXX DRAGONFLY - device_mapping not yet implemented so
1522  * file_mapping is basically always NULL.  We have to properly
1523  * release the mmap, etc.
1524 */
1525 void ttm_bo_release_mmap(struct ttm_buffer_object *bo);
1526
1527 /**
1528  * drm_vma_node_unmap() - Unmap offset node
1529  * @node: Offset node
1530  * @file_mapping: Address space to unmap @node from
1531  *
1532  * Unmap all userspace mappings for a given offset node. The mappings must be
1533  * associated with the @file_mapping address-space. If no offset exists or
1534  * the address-space is invalid, nothing is done.
1535  *
1536  * This call is unlocked. The caller must guarantee that drm_vma_offset_remove()
1537  * is not called on this node concurrently.
1538  */
1539 static inline void drm_vma_node_unmap(struct drm_vma_offset_node *node,
1540                                       struct address_space *file_mapping)
1541 {
1542         struct ttm_buffer_object *bo = container_of(node, struct ttm_buffer_object, vma_node);
1543
1544         if (drm_vma_node_has_offset(node))
1545                 unmap_mapping_range(file_mapping,
1546                                     drm_vma_node_offset_addr(node),
1547                                     drm_vma_node_size(node) << PAGE_SHIFT, 1);
1548         ttm_bo_release_mmap(bo);
1549 }
1550 #endif
1551
1552 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1553 {
1554         struct ttm_bo_device *bdev = bo->bdev;
1555
1556         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1557         ttm_mem_io_free_vm(bo);
1558 }
1559
1560 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1561 {
1562         struct ttm_bo_device *bdev = bo->bdev;
1563         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1564
1565         ttm_mem_io_lock(man, false);
1566         ttm_bo_unmap_virtual_locked(bo);
1567         ttm_mem_io_unlock(man);
1568 }
1569
1570
1571 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1572
1573 int ttm_bo_wait(struct ttm_buffer_object *bo,
1574                 bool lazy, bool interruptible, bool no_wait)
1575 {
1576         struct reservation_object_list *fobj;
1577         struct reservation_object *resv;
1578         struct fence *excl;
1579         long timeout = 15 * HZ;
1580         int i;
1581
1582         resv = bo->resv;
1583         fobj = reservation_object_get_list(resv);
1584         excl = reservation_object_get_excl(resv);
1585         if (excl) {
1586                 if (!fence_is_signaled(excl)) {
1587                         if (no_wait)
1588                                 return -EBUSY;
1589
1590                         timeout = fence_wait_timeout(excl,
1591                                                      interruptible, timeout);
1592                 }
1593         }
1594
1595         for (i = 0; fobj && timeout > 0 && i < fobj->shared_count; ++i) {
1596                 struct fence *fence;
1597                 fence = rcu_dereference_protected(fobj->shared[i],
1598                                                 reservation_object_held(resv));
1599
1600                 if (!fence_is_signaled(fence)) {
1601                         if (no_wait)
1602                                 return -EBUSY;
1603
1604                         timeout = fence_wait_timeout(fence,
1605                                                      interruptible, timeout);
1606                 }
1607         }
1608
1609         if (timeout < 0)
1610                 return timeout;
1611
1612         if (timeout == 0)
1613                 return -EBUSY;
1614
1615         reservation_object_add_excl_fence(resv, NULL);
1616         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1617         return 0;
1618 }
1619 EXPORT_SYMBOL(ttm_bo_wait);
1620
1621 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1622 {
1623         int ret = 0;
1624
1625         /*
1626          * Using ttm_bo_reserve makes sure the lru lists are updated.
1627          */
1628
1629         ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
1630         if (unlikely(ret != 0))
1631                 return ret;
1632         ret = ttm_bo_wait(bo, false, true, no_wait);
1633         if (likely(ret == 0))
1634                 atomic_inc(&bo->cpu_writers);
1635         ttm_bo_unreserve(bo);
1636         return ret;
1637 }
1638 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1639
1640 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1641 {
1642         atomic_dec(&bo->cpu_writers);
1643 }
1644 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1645
1646 /**
1647  * A buffer object shrink method that tries to swap out the first
1648  * buffer object on the bo_global::swap_lru list.
1649  */
1650
1651 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1652 {
1653         struct ttm_bo_global *glob =
1654             container_of(shrink, struct ttm_bo_global, shrink);
1655         struct ttm_buffer_object *bo;
1656         int ret = -EBUSY;
1657         int put_count;
1658         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1659
1660         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1661         list_for_each_entry(bo, &glob->swap_lru, swap) {
1662                 ret = __ttm_bo_reserve(bo, false, true, false, 0);
1663                 if (!ret)
1664                         break;
1665         }
1666
1667         if (ret) {
1668                 lockmgr(&glob->lru_lock, LK_RELEASE);
1669                 return ret;
1670         }
1671
1672         kref_get(&bo->list_kref);
1673
1674         if (!list_empty(&bo->ddestroy)) {
1675                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1676                 kref_put(&bo->list_kref, ttm_bo_release_list);
1677                 return ret;
1678         }
1679
1680         put_count = ttm_bo_del_from_lru(bo);
1681         lockmgr(&glob->lru_lock, LK_RELEASE);
1682
1683         ttm_bo_list_ref_sub(bo, put_count, true);
1684
1685         /**
1686          * Wait for GPU, then move to system cached.
1687          */
1688
1689         ret = ttm_bo_wait(bo, false, false, false);
1690
1691         if (unlikely(ret != 0))
1692                 goto out;
1693
1694         if ((bo->mem.placement & swap_placement) != swap_placement) {
1695                 struct ttm_mem_reg evict_mem;
1696
1697                 evict_mem = bo->mem;
1698                 evict_mem.mm_node = NULL;
1699                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1700                 evict_mem.mem_type = TTM_PL_SYSTEM;
1701
1702                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1703                                              false, false);
1704                 if (unlikely(ret != 0))
1705                         goto out;
1706         }
1707
1708         ttm_bo_unmap_virtual(bo);
1709
1710         /**
1711          * Swap out. Buffer will be swapped in again as soon as
1712          * anyone tries to access a ttm page.
1713          */
1714
1715         if (bo->bdev->driver->swap_notify)
1716                 bo->bdev->driver->swap_notify(bo);
1717
1718         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1719 out:
1720
1721         /**
1722          *
1723          * Unreserve without putting on LRU to avoid swapping out an
1724          * already swapped buffer.
1725          */
1726
1727         __ttm_bo_unreserve(bo);
1728         kref_put(&bo->list_kref, ttm_bo_release_list);
1729         return ret;
1730 }
1731
1732 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1733 {
1734         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1735                 ;
1736 }
1737 EXPORT_SYMBOL(ttm_bo_swapout_all);
1738
1739 /**
1740  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1741  * unreserved
1742  *
1743  * @bo: Pointer to buffer
1744  */
1745 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1746 {
1747         int ret;
1748
1749         /*
1750          * In the absense of a wait_unlocked API,
1751          * Use the bo::wu_mutex to avoid triggering livelocks due to
1752          * concurrent use of this function. Note that this use of
1753          * bo::wu_mutex can go away if we change locking order to
1754          * mmap_sem -> bo::reserve.
1755          */
1756         ret = mutex_lock_interruptible(&bo->wu_mutex);
1757         if (unlikely(ret != 0))
1758                 return -ERESTARTSYS;
1759         if (!ww_mutex_is_locked(&bo->resv->lock))
1760                 goto out_unlock;
1761         ret = __ttm_bo_reserve(bo, true, false, false, NULL);
1762         if (unlikely(ret != 0))
1763                 goto out_unlock;
1764         __ttm_bo_unreserve(bo);
1765
1766 out_unlock:
1767         mutex_unlock(&bo->wu_mutex);
1768         return ret;
1769 }