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
 169         lockdep_assert_held(&bo->resv->lock.base);
 170
 171         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 172
 173                 BUG_ON(!list_empty(&bo->lru));
 174
 175                 list_add(&bo->lru, bdev->driver->lru_tail(bo));
 176                 kref_get(&bo->list_kref);
 177
 178                 if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
 179                         list_add(&bo->swap, bdev->driver->swap_lru_tail(bo));
 180                         kref_get(&bo->list_kref);
 181                 }
 182         }
 183 }
 184 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 185
 186 int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 187 {
 188         struct ttm_bo_device *bdev = bo->bdev;
 189         int put_count = 0;
 190
 191         if (bdev->driver->lru_removal)
 192                 bdev->driver->lru_removal(bo);
 193
 194         if (!list_empty(&bo->swap)) {
 195                 list_del_init(&bo->swap);
 196                 ++put_count;
 197         }
 198         if (!list_empty(&bo->lru)) {
 199                 list_del_init(&bo->lru);
 200                 ++put_count;
 201         }
 202
 203         return put_count;
 204 }
 205
 206 static void ttm_bo_ref_bug(struct kref *list_kref)
 207 {
 208         BUG();
 209 }
 210
 211 void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
 212                          bool never_free)
 213 {
 214         kref_sub(&bo->list_kref, count,
 215                  (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
 216 }
 217
 218 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 219 {
 220         int put_count;
 221
 222         lockmgr(&bo->glob->lru_lock, LK_EXCLUSIVE);
 223         put_count = ttm_bo_del_from_lru(bo);
 224         lockmgr(&bo->glob->lru_lock, LK_RELEASE);
 225         ttm_bo_list_ref_sub(bo, put_count, true);
 226 }
 227 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 228
 229 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 230 {
 231         struct ttm_bo_device *bdev = bo->bdev;
 232         int put_count = 0;
 233
 234         lockdep_assert_held(&bo->resv->lock.base);
 235
 236         if (bdev->driver->lru_removal)
 237                 bdev->driver->lru_removal(bo);
 238
 239         put_count = ttm_bo_del_from_lru(bo);
 240         ttm_bo_list_ref_sub(bo, put_count, true);
 241         ttm_bo_add_to_lru(bo);
 242 }
 243 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 244
 245 struct list_head *ttm_bo_default_lru_tail(struct ttm_buffer_object *bo)
 246 {
 247         return bo->bdev->man[bo->mem.mem_type].lru.prev;
 248 }
 249 EXPORT_SYMBOL(ttm_bo_default_lru_tail);
 250
 251 struct list_head *ttm_bo_default_swap_lru_tail(struct ttm_buffer_object *bo)
 252 {
 253         return bo->glob->swap_lru.prev;
 254 }
 255 EXPORT_SYMBOL(ttm_bo_default_swap_lru_tail);
 256
 257 /*
 258  * Call bo->mutex locked.
 259  */
 260 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 261 {
 262         struct ttm_bo_device *bdev = bo->bdev;
 263         struct ttm_bo_global *glob = bo->glob;
 264         int ret = 0;
 265         uint32_t page_flags = 0;
 266
 267         TTM_ASSERT_LOCKED(&bo->mutex);
 268         bo->ttm = NULL;
 269
 270         if (bdev->need_dma32)
 271                 page_flags |= TTM_PAGE_FLAG_DMA32;
 272
 273         switch (bo->type) {
 274         case ttm_bo_type_device:
 275                 if (zero_alloc)
 276                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 277         case ttm_bo_type_kernel:
 278                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 279                                                       page_flags, glob->dummy_read_page);
 280                 if (unlikely(bo->ttm == NULL))
 281                         ret = -ENOMEM;
 282                 break;
 283         case ttm_bo_type_sg:
 284                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 285                                                       page_flags | TTM_PAGE_FLAG_SG,
 286                                                       glob->dummy_read_page);
 287                 if (unlikely(bo->ttm == NULL)) {
 288                         ret = -ENOMEM;
 289                         break;
 290                 }
 291                 bo->ttm->sg = bo->sg;
 292                 break;
 293         default:
 294                 pr_err("Illegal buffer object type\n");
 295                 ret = -EINVAL;
 296                 break;
 297         }
 298
 299         return ret;
 300 }
 301
 302 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 303                                   struct ttm_mem_reg *mem,
 304                                   bool evict, bool interruptible,
 305                                   bool no_wait_gpu)
 306 {
 307         struct ttm_bo_device *bdev = bo->bdev;
 308         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 309         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 310         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 311         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 312         int ret = 0;
 313
 314         if (old_is_pci || new_is_pci ||
 315             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 316                 ret = ttm_mem_io_lock(old_man, true);
 317                 if (unlikely(ret != 0))
 318                         goto out_err;
 319                 ttm_bo_unmap_virtual_locked(bo);
 320                 ttm_mem_io_unlock(old_man);
 321         }
 322
 323         /*
 324          * Create and bind a ttm if required.
 325          */
 326
 327         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 328                 if (bo->ttm == NULL) {
 329                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 330                         ret = ttm_bo_add_ttm(bo, zero);
 331                         if (ret)
 332                                 goto out_err;
 333                 }
 334
 335                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 336                 if (ret)
 337                         goto out_err;
 338
 339                 if (mem->mem_type != TTM_PL_SYSTEM) {
 340                         ret = ttm_tt_bind(bo->ttm, mem);
 341                         if (ret)
 342                                 goto out_err;
 343                 }
 344
 345                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 346                         if (bdev->driver->move_notify)
 347                                 bdev->driver->move_notify(bo, mem);
 348                         bo->mem = *mem;
 349                         mem->mm_node = NULL;
 350                         goto moved;
 351                 }
 352         }
 353
 354         if (bdev->driver->move_notify)
 355                 bdev->driver->move_notify(bo, mem);
 356
 357         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 358             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 359                 ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);
 360         else if (bdev->driver->move)
 361                 ret = bdev->driver->move(bo, evict, interruptible,
 362                                          no_wait_gpu, mem);
 363         else
 364                 ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);
 365
 366         if (ret) {
 367                 if (bdev->driver->move_notify) {
 368                         struct ttm_mem_reg tmp_mem = *mem;
 369                         *mem = bo->mem;
 370                         bo->mem = tmp_mem;
 371                         bdev->driver->move_notify(bo, mem);
 372                         bo->mem = *mem;
 373                         *mem = tmp_mem;
 374                 }
 375
 376                 goto out_err;
 377         }
 378
 379 moved:
 380         if (bo->evicted) {
 381                 if (bdev->driver->invalidate_caches) {
 382                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 383                         if (ret)
 384                                 pr_err("Can not flush read caches\n");
 385                 }
 386                 bo->evicted = false;
 387         }
 388
 389         if (bo->mem.mm_node) {
 390                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 391                     bdev->man[bo->mem.mem_type].gpu_offset;
 392                 bo->cur_placement = bo->mem.placement;
 393         } else
 394                 bo->offset = 0;
 395
 396         return 0;
 397
 398 out_err:
 399         new_man = &bdev->man[bo->mem.mem_type];
 400         if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
 401                 ttm_tt_unbind(bo->ttm);
 402                 ttm_tt_destroy(bo->ttm);
 403                 bo->ttm = NULL;
 404         }
 405
 406         return ret;
 407 }
 408
 409 /**
 410  * Call bo::reserved.
 411  * Will release GPU memory type usage on destruction.
 412  * This is the place to put in driver specific hooks to release
 413  * driver private resources.
 414  * Will release the bo::reserved lock.
 415  */
 416
 417 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 418 {
 419         if (bo->bdev->driver->move_notify)
 420                 bo->bdev->driver->move_notify(bo, NULL);
 421
 422         if (bo->ttm) {
 423                 ttm_tt_unbind(bo->ttm);
 424                 ttm_tt_destroy(bo->ttm);
 425                 bo->ttm = NULL;
 426         }
 427         ttm_bo_mem_put(bo, &bo->mem);
 428
 429         ww_mutex_unlock (&bo->resv->lock);
 430 }
 431
 432 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 433 {
 434         struct reservation_object_list *fobj;
 435         struct fence *fence;
 436         int i;
 437
 438         fobj = reservation_object_get_list(bo->resv);
 439         fence = reservation_object_get_excl(bo->resv);
 440         if (fence && !fence->ops->signaled)
 441                 fence_enable_sw_signaling(fence);
 442
 443         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 444                 fence = rcu_dereference_protected(fobj->shared[i],
 445                                         reservation_object_held(bo->resv));
 446
 447                 if (!fence->ops->signaled)
 448                         fence_enable_sw_signaling(fence);
 449         }
 450 }
 451
 452 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 453 {
 454         struct ttm_bo_device *bdev = bo->bdev;
 455         struct ttm_bo_global *glob = bo->glob;
 456         int put_count;
 457         int ret;
 458
 459         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 460         ret = __ttm_bo_reserve(bo, false, true, NULL);
 461
 462         if (!ret) {
 463                 if (!ttm_bo_wait(bo, false, true)) {
 464                         put_count = ttm_bo_del_from_lru(bo);
 465
 466                         lockmgr(&glob->lru_lock, LK_RELEASE);
 467                         ttm_bo_cleanup_memtype_use(bo);
 468
 469                         ttm_bo_list_ref_sub(bo, put_count, true);
 470
 471                         return;
 472                 } else
 473                         ttm_bo_flush_all_fences(bo);
 474
 475                 /*
 476                  * Make NO_EVICT bos immediately available to
 477                  * shrinkers, now that they are queued for
 478                  * destruction.
 479                  */
 480                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 481                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 482                         ttm_bo_add_to_lru(bo);
 483                 }
 484
 485                 __ttm_bo_unreserve(bo);
 486         }
 487
 488         kref_get(&bo->list_kref);
 489         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 490         lockmgr(&glob->lru_lock, LK_RELEASE);
 491
 492         schedule_delayed_work(&bdev->wq,
 493                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 494 }
 495
 496 /**
 497  * function ttm_bo_cleanup_refs_and_unlock
 498  * If bo idle, remove from delayed- and lru lists, and unref.
 499  * If not idle, do nothing.
 500  *
 501  * Must be called with lru_lock and reservation held, this function
 502  * will drop both before returning.
 503  *
 504  * @interruptible         Any sleeps should occur interruptibly.
 505  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 506  */
 507
 508 static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
 509                                           bool interruptible,
 510                                           bool no_wait_gpu)
 511 {
 512         struct ttm_bo_global *glob = bo->glob;
 513         int put_count;
 514         int ret;
 515
 516         ret = ttm_bo_wait(bo, false, true);
 517
 518         if (ret && !no_wait_gpu) {
 519                 long lret;
 520                 ww_mutex_unlock(&bo->resv->lock);
 521                 lockmgr(&glob->lru_lock, LK_RELEASE);
 522
 523                 lret = reservation_object_wait_timeout_rcu(bo->resv,
 524                                                            true,
 525                                                            interruptible,
 526                                                            30 * HZ);
 527
 528                 if (lret < 0)
 529                         return lret;
 530                 else if (lret == 0)
 531                         return -EBUSY;
 532
 533                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 534                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 535
 536                 /*
 537                  * We raced, and lost, someone else holds the reservation now,
 538                  * and is probably busy in ttm_bo_cleanup_memtype_use.
 539                  *
 540                  * Even if it's not the case, because we finished waiting any
 541                  * delayed destruction would succeed, so just return success
 542                  * here.
 543                  */
 544                 if (ret) {
 545                         lockmgr(&glob->lru_lock, LK_RELEASE);
 546                         return 0;
 547                 }
 548
 549                 /*
 550                  * remove sync_obj with ttm_bo_wait, the wait should be
 551                  * finished, and no new wait object should have been added.
 552                  */
 553                 ret = ttm_bo_wait(bo, false, true);
 554                 WARN_ON(ret);
 555         }
 556
 557         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 558                 __ttm_bo_unreserve(bo);
 559                 lockmgr(&glob->lru_lock, LK_RELEASE);
 560                 return ret;
 561         }
 562
 563         put_count = ttm_bo_del_from_lru(bo);
 564         list_del_init(&bo->ddestroy);
 565         ++put_count;
 566
 567         lockmgr(&glob->lru_lock, LK_RELEASE);
 568         ttm_bo_cleanup_memtype_use(bo);
 569
 570         ttm_bo_list_ref_sub(bo, put_count, true);
 571
 572         return 0;
 573 }
 574
 575 /**
 576  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 577  * encountered buffers.
 578  */
 579
 580 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 581 {
 582         struct ttm_bo_global *glob = bdev->glob;
 583         struct ttm_buffer_object *entry = NULL;
 584         int ret = 0;
 585
 586         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 587         if (list_empty(&bdev->ddestroy))
 588                 goto out_unlock;
 589
 590         entry = list_first_entry(&bdev->ddestroy,
 591                 struct ttm_buffer_object, ddestroy);
 592         kref_get(&entry->list_kref);
 593
 594         for (;;) {
 595                 struct ttm_buffer_object *nentry = NULL;
 596
 597                 if (entry->ddestroy.next != &bdev->ddestroy) {
 598                         nentry = list_first_entry(&entry->ddestroy,
 599                                 struct ttm_buffer_object, ddestroy);
 600                         kref_get(&nentry->list_kref);
 601                 }
 602
 603                 ret = __ttm_bo_reserve(entry, false, true, NULL);
 604                 if (remove_all && ret) {
 605                         lockmgr(&glob->lru_lock, LK_RELEASE);
 606                         ret = __ttm_bo_reserve(entry, false, false, NULL);
 607                         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 608                 }
 609
 610                 if (!ret)
 611                         ret = ttm_bo_cleanup_refs_and_unlock(entry, false,
 612                                                              !remove_all);
 613                 else
 614                         lockmgr(&glob->lru_lock, LK_RELEASE);
 615
 616                 kref_put(&entry->list_kref, ttm_bo_release_list);
 617                 entry = nentry;
 618
 619                 if (ret || !entry)
 620                         goto out;
 621
 622                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 623                 if (list_empty(&entry->ddestroy))
 624                         break;
 625         }
 626
 627 out_unlock:
 628         lockmgr(&glob->lru_lock, LK_RELEASE);
 629 out:
 630         if (entry)
 631                 kref_put(&entry->list_kref, ttm_bo_release_list);
 632         return ret;
 633 }
 634
 635 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 636 {
 637         struct ttm_bo_device *bdev =
 638             container_of(work, struct ttm_bo_device, wq.work);
 639
 640         if (ttm_bo_delayed_delete(bdev, false)) {
 641                 schedule_delayed_work(&bdev->wq,
 642                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 643         }
 644 }
 645
 646 static void ttm_bo_release(struct kref *kref)
 647 {
 648         struct ttm_buffer_object *bo =
 649             container_of(kref, struct ttm_buffer_object, kref);
 650         struct ttm_bo_device *bdev = bo->bdev;
 651         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 652
 653         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 654         ttm_mem_io_lock(man, false);
 655         ttm_mem_io_free_vm(bo);
 656         ttm_mem_io_unlock(man);
 657         ttm_bo_cleanup_refs_or_queue(bo);
 658         kref_put(&bo->list_kref, ttm_bo_release_list);
 659 }
 660
 661 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 662 {
 663         struct ttm_buffer_object *bo = *p_bo;
 664
 665         *p_bo = NULL;
 666         kref_put(&bo->kref, ttm_bo_release);
 667 }
 668 EXPORT_SYMBOL(ttm_bo_unref);
 669
 670 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 671 {
 672         return cancel_delayed_work_sync(&bdev->wq);
 673 }
 674 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 675
 676 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 677 {
 678         if (resched)
 679                 schedule_delayed_work(&bdev->wq,
 680                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 681 }
 682 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 683
 684 static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
 685                         bool no_wait_gpu)
 686 {
 687         struct ttm_bo_device *bdev = bo->bdev;
 688         struct ttm_mem_reg evict_mem;
 689         struct ttm_placement placement;
 690         int ret = 0;
 691
 692         ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
 693
 694         if (unlikely(ret != 0)) {
 695                 if (ret != -ERESTARTSYS) {
 696                         pr_err("Failed to expire sync object before buffer eviction\n");
 697                 }
 698                 goto out;
 699         }
 700
 701         lockdep_assert_held(&bo->resv->lock.base);
 702
 703         evict_mem = bo->mem;
 704         evict_mem.mm_node = NULL;
 705         evict_mem.bus.io_reserved_vm = false;
 706         evict_mem.bus.io_reserved_count = 0;
 707
 708         placement.num_placement = 0;
 709         placement.num_busy_placement = 0;
 710         bdev->driver->evict_flags(bo, &placement);
 711         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
 712                                 no_wait_gpu);
 713         if (ret) {
 714                 if (ret != -ERESTARTSYS) {
 715                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 716                                bo);
 717                         ttm_bo_mem_space_debug(bo, &placement);
 718                 }
 719                 goto out;
 720         }
 721
 722         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
 723                                      no_wait_gpu);
 724         if (ret) {
 725                 if (ret != -ERESTARTSYS)
 726                         pr_err("Buffer eviction failed\n");
 727                 ttm_bo_mem_put(bo, &evict_mem);
 728                 goto out;
 729         }
 730         bo->evicted = true;
 731 out:
 732         return ret;
 733 }
 734
 735 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 736                                 uint32_t mem_type,
 737                                 const struct ttm_place *place,
 738                                 bool interruptible,
 739                                 bool no_wait_gpu)
 740 {
 741         struct ttm_bo_global *glob = bdev->glob;
 742         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 743         struct ttm_buffer_object *bo;
 744         int ret = -EBUSY, put_count;
 745
 746         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
 747         list_for_each_entry(bo, &man->lru, lru) {
 748                 ret = __ttm_bo_reserve(bo, false, true, NULL);
 749                 if (!ret) {
 750                         if (place && (place->fpfn || place->lpfn)) {
 751                                 /* Don't evict this BO if it's outside of the
 752                                  * requested placement range
 753                                  */
 754                                 if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 755                                     (place->lpfn && place->lpfn <= bo->mem.start)) {
 756                                         __ttm_bo_unreserve(bo);
 757                                         ret = -EBUSY;
 758                                         continue;
 759                                 }
 760                         }
 761
 762                         break;
 763                 }
 764         }
 765
 766         if (ret) {
 767                 lockmgr(&glob->lru_lock, LK_RELEASE);
 768                 return ret;
 769         }
 770
 771         kref_get(&bo->list_kref);
 772
 773         if (!list_empty(&bo->ddestroy)) {
 774                 ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,
 775                                                      no_wait_gpu);
 776                 kref_put(&bo->list_kref, ttm_bo_release_list);
 777                 return ret;
 778         }
 779
 780         put_count = ttm_bo_del_from_lru(bo);
 781         lockmgr(&glob->lru_lock, LK_RELEASE);
 782
 783         BUG_ON(ret != 0);
 784
 785         ttm_bo_list_ref_sub(bo, put_count, true);
 786
 787         ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);
 788         ttm_bo_unreserve(bo);
 789
 790         kref_put(&bo->list_kref, ttm_bo_release_list);
 791         return ret;
 792 }
 793
 794 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 795 {
 796         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 797
 798         if (mem->mm_node)
 799                 (*man->func->put_node)(man, mem);
 800 }
 801 EXPORT_SYMBOL(ttm_bo_mem_put);
 802
 803 /**
 804  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 805  * space, or we've evicted everything and there isn't enough space.
 806  */
 807 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 808                                         uint32_t mem_type,
 809                                         const struct ttm_place *place,
 810                                         struct ttm_mem_reg *mem,
 811                                         bool interruptible,
 812                                         bool no_wait_gpu)
 813 {
 814         struct ttm_bo_device *bdev = bo->bdev;
 815         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 816         int ret;
 817
 818         do {
 819                 ret = (*man->func->get_node)(man, bo, place, mem);
 820                 if (unlikely(ret != 0))
 821                         return ret;
 822                 if (mem->mm_node)
 823                         break;
 824                 ret = ttm_mem_evict_first(bdev, mem_type, place,
 825                                           interruptible, no_wait_gpu);
 826                 if (unlikely(ret != 0))
 827                         return ret;
 828         } while (1);
 829         if (mem->mm_node == NULL)
 830                 return -ENOMEM;
 831         mem->mem_type = mem_type;
 832         return 0;
 833 }
 834
 835 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 836                                       uint32_t cur_placement,
 837                                       uint32_t proposed_placement)
 838 {
 839         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 840         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 841
 842         /**
 843          * Keep current caching if possible.
 844          */
 845
 846         if ((cur_placement & caching) != 0)
 847                 result |= (cur_placement & caching);
 848         else if ((man->default_caching & caching) != 0)
 849                 result |= man->default_caching;
 850         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 851                 result |= TTM_PL_FLAG_CACHED;
 852         else if ((TTM_PL_FLAG_WC & caching) != 0)
 853                 result |= TTM_PL_FLAG_WC;
 854         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 855                 result |= TTM_PL_FLAG_UNCACHED;
 856
 857         return result;
 858 }
 859
 860 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 861                                  uint32_t mem_type,
 862                                  const struct ttm_place *place,
 863                                  uint32_t *masked_placement)
 864 {
 865         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 866
 867         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 868                 return false;
 869
 870         if ((place->flags & man->available_caching) == 0)
 871                 return false;
 872
 873         cur_flags |= (place->flags & man->available_caching);
 874
 875         *masked_placement = cur_flags;
 876         return true;
 877 }
 878
 879 /**
 880  * Creates space for memory region @mem according to its type.
 881  *
 882  * This function first searches for free space in compatible memory types in
 883  * the priority order defined by the driver.  If free space isn't found, then
 884  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 885  * space.
 886  */
 887 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 888                         struct ttm_placement *placement,
 889                         struct ttm_mem_reg *mem,
 890                         bool interruptible,
 891                         bool no_wait_gpu)
 892 {
 893         struct ttm_bo_device *bdev = bo->bdev;
 894         struct ttm_mem_type_manager *man;
 895         uint32_t mem_type = TTM_PL_SYSTEM;
 896         uint32_t cur_flags = 0;
 897         bool type_found = false;
 898         bool type_ok = false;
 899         bool has_erestartsys = false;
 900         int i, ret;
 901
 902         mem->mm_node = NULL;
 903         for (i = 0; i < placement->num_placement; ++i) {
 904                 const struct ttm_place *place = &placement->placement[i];
 905
 906                 ret = ttm_mem_type_from_place(place, &mem_type);
 907                 if (ret)
 908                         return ret;
 909                 man = &bdev->man[mem_type];
 910                 if (!man->has_type || !man->use_type)
 911                         continue;
 912
 913                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 914                                                 &cur_flags);
 915
 916                 if (!type_ok)
 917                         continue;
 918
 919                 type_found = true;
 920                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 921                                                   cur_flags);
 922                 /*
 923                  * Use the access and other non-mapping-related flag bits from
 924                  * the memory placement flags to the current flags
 925                  */
 926                 ttm_flag_masked(&cur_flags, place->flags,
 927                                 ~TTM_PL_MASK_MEMTYPE);
 928
 929                 if (mem_type == TTM_PL_SYSTEM)
 930                         break;
 931
 932                 ret = (*man->func->get_node)(man, bo, place, mem);
 933                 if (unlikely(ret))
 934                         return ret;
 935
 936                 if (mem->mm_node)
 937                         break;
 938         }
 939
 940         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 941                 mem->mem_type = mem_type;
 942                 mem->placement = cur_flags;
 943                 return 0;
 944         }
 945
 946         for (i = 0; i < placement->num_busy_placement; ++i) {
 947                 const struct ttm_place *place = &placement->busy_placement[i];
 948
 949                 ret = ttm_mem_type_from_place(place, &mem_type);
 950                 if (ret)
 951                         return ret;
 952                 man = &bdev->man[mem_type];
 953                 if (!man->has_type || !man->use_type)
 954                         continue;
 955                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 956                         continue;
 957
 958                 type_found = true;
 959                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 960                                                   cur_flags);
 961                 /*
 962                  * Use the access and other non-mapping-related flag bits from
 963                  * the memory placement flags to the current flags
 964                  */
 965                 ttm_flag_masked(&cur_flags, place->flags,
 966                                 ~TTM_PL_MASK_MEMTYPE);
 967
 968                 if (mem_type == TTM_PL_SYSTEM) {
 969                         mem->mem_type = mem_type;
 970                         mem->placement = cur_flags;
 971                         mem->mm_node = NULL;
 972                         return 0;
 973                 }
 974
 975                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem,
 976                                                 interruptible, no_wait_gpu);
 977                 if (ret == 0 && mem->mm_node) {
 978                         mem->placement = cur_flags;
 979                         return 0;
 980                 }
 981                 if (ret == -ERESTARTSYS)
 982                         has_erestartsys = true;
 983         }
 984
 985         if (!type_found) {
 986                 printk(KERN_ERR TTM_PFX "No compatible memory type found.\n");
 987                 return -EINVAL;
 988         }
 989
 990         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
 991 }
 992 EXPORT_SYMBOL(ttm_bo_mem_space);
 993
 994 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 995                         struct ttm_placement *placement,
 996                         bool interruptible,
 997                         bool no_wait_gpu)
 998 {
 999         int ret = 0;
1000         struct ttm_mem_reg mem;
1001
1002         lockdep_assert_held(&bo->resv->lock.base);
1003
1004         /*
1005          * Don't wait for the BO on initial allocation. This is important when
1006          * the BO has an imported reservation object.
1007          */
1008         if (bo->mem.mem_type != TTM_PL_SYSTEM || bo->ttm != NULL) {
1009                 /*
1010                  * FIXME: It's possible to pipeline buffer moves.
1011                  * Have the driver move function wait for idle when necessary,
1012                  * instead of doing it here.
1013                  */
1014                 ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
1015                 if (ret)
1016                         return ret;
1017         }
1018         mem.num_pages = bo->num_pages;
1019         mem.size = mem.num_pages << PAGE_SHIFT;
1020         mem.page_alignment = bo->mem.page_alignment;
1021         mem.bus.io_reserved_vm = false;
1022         mem.bus.io_reserved_count = 0;
1023         /*
1024          * Determine where to move the buffer.
1025          */
1026         ret = ttm_bo_mem_space(bo, placement, &mem,
1027                                interruptible, no_wait_gpu);
1028         if (ret)
1029                 goto out_unlock;
1030         ret = ttm_bo_handle_move_mem(bo, &mem, false,
1031                                      interruptible, no_wait_gpu);
1032 out_unlock:
1033         if (ret && mem.mm_node)
1034                 ttm_bo_mem_put(bo, &mem);
1035         return ret;
1036 }
1037
1038 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1039                        struct ttm_mem_reg *mem,
1040                        uint32_t *new_flags)
1041 {
1042         int i;
1043
1044         for (i = 0; i < placement->num_placement; i++) {
1045                 const struct ttm_place *heap = &placement->placement[i];
1046                 if (mem->mm_node &&
1047                     (mem->start < heap->fpfn ||
1048                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1049                         continue;
1050
1051                 *new_flags = heap->flags;
1052                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1053                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1054                         return true;
1055         }
1056
1057         for (i = 0; i < placement->num_busy_placement; i++) {
1058                 const struct ttm_place *heap = &placement->busy_placement[i];
1059                 if (mem->mm_node &&
1060                     (mem->start < heap->fpfn ||
1061                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1062                         continue;
1063
1064                 *new_flags = heap->flags;
1065                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1066                     (*new_flags & mem->placement & TTM_PL_MASK_MEM))
1067                         return true;
1068         }
1069
1070         return false;
1071 }
1072 EXPORT_SYMBOL(ttm_bo_mem_compat);
1073
1074 int ttm_bo_validate(struct ttm_buffer_object *bo,
1075                         struct ttm_placement *placement,
1076                         bool interruptible,
1077                         bool no_wait_gpu)
1078 {
1079         int ret;
1080         uint32_t new_flags;
1081
1082         lockdep_assert_held(&bo->resv->lock.base);
1083         /*
1084          * Check whether we need to move buffer.
1085          */
1086         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1087                 ret = ttm_bo_move_buffer(bo, placement, interruptible,
1088                                          no_wait_gpu);
1089                 if (ret)
1090                         return ret;
1091         } else {
1092                 /*
1093                  * Use the access and other non-mapping-related flag bits from
1094                  * the compatible memory placement flags to the active flags
1095                  */
1096                 ttm_flag_masked(&bo->mem.placement, new_flags,
1097                                 ~TTM_PL_MASK_MEMTYPE);
1098         }
1099         /*
1100          * We might need to add a TTM.
1101          */
1102         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1103                 ret = ttm_bo_add_ttm(bo, true);
1104                 if (ret)
1105                         return ret;
1106         }
1107         return 0;
1108 }
1109 EXPORT_SYMBOL(ttm_bo_validate);
1110
1111 int ttm_bo_init(struct ttm_bo_device *bdev,
1112                 struct ttm_buffer_object *bo,
1113                 unsigned long size,
1114                 enum ttm_bo_type type,
1115                 struct ttm_placement *placement,
1116                 uint32_t page_alignment,
1117                 bool interruptible,
1118                 struct vm_object *persistent_swap_storage,
1119                 size_t acc_size,
1120                 struct sg_table *sg,
1121                 struct reservation_object *resv,
1122                 void (*destroy) (struct ttm_buffer_object *))
1123 {
1124         int ret = 0;
1125         unsigned long num_pages;
1126         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1127         bool locked;
1128
1129         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
1130         if (ret) {
1131                 pr_err("Out of kernel memory\n");
1132                 if (destroy)
1133                         (*destroy)(bo);
1134                 else
1135                         kfree(bo);
1136                 return -ENOMEM;
1137         }
1138
1139         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1140         if (num_pages == 0) {
1141                 pr_err("Illegal buffer object size\n");
1142                 if (destroy)
1143                         (*destroy)(bo);
1144                 else
1145                         kfree(bo);
1146                 ttm_mem_global_free(mem_glob, acc_size);
1147                 return -EINVAL;
1148         }
1149         bo->destroy = destroy;
1150
1151         kref_init(&bo->kref);
1152         kref_init(&bo->list_kref);
1153         atomic_set(&bo->cpu_writers, 0);
1154         INIT_LIST_HEAD(&bo->lru);
1155         INIT_LIST_HEAD(&bo->ddestroy);
1156         INIT_LIST_HEAD(&bo->swap);
1157         INIT_LIST_HEAD(&bo->io_reserve_lru);
1158         lockinit(&bo->wu_mutex, "ttmbwm", 0, LK_CANRECURSE);
1159         bo->bdev = bdev;
1160         bo->glob = bdev->glob;
1161         bo->type = type;
1162         bo->num_pages = num_pages;
1163         bo->mem.size = num_pages << PAGE_SHIFT;
1164         bo->mem.mem_type = TTM_PL_SYSTEM;
1165         bo->mem.num_pages = bo->num_pages;
1166         bo->mem.mm_node = NULL;
1167         bo->mem.page_alignment = page_alignment;
1168         bo->mem.bus.io_reserved_vm = false;
1169         bo->mem.bus.io_reserved_count = 0;
1170         bo->priv_flags = 0;
1171         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1172         bo->persistent_swap_storage = persistent_swap_storage;
1173         bo->acc_size = acc_size;
1174         bo->sg = sg;
1175         if (resv) {
1176                 bo->resv = resv;
1177                 lockdep_assert_held(&bo->resv->lock.base);
1178         } else {
1179                 bo->resv = &bo->ttm_resv;
1180                 reservation_object_init(&bo->ttm_resv);
1181         }
1182         atomic_inc(&bo->glob->bo_count);
1183         drm_vma_node_reset(&bo->vma_node);
1184
1185         /*
1186          * For ttm_bo_type_device buffers, allocate
1187          * address space from the device.
1188          */
1189         if (bo->type == ttm_bo_type_device ||
1190             bo->type == ttm_bo_type_sg)
1191                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1192                                          bo->mem.num_pages);
1193
1194         /* passed reservation objects should already be locked,
1195          * since otherwise lockdep will be angered in radeon.
1196          */
1197         if (!resv) {
1198                 locked = ww_mutex_trylock(&bo->resv->lock);
1199                 WARN_ON(!locked);
1200         }
1201
1202         if (likely(!ret))
1203                 ret = ttm_bo_validate(bo, placement, interruptible, false);
1204
1205         if (!resv) {
1206                 ttm_bo_unreserve(bo);
1207
1208         } else if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1209                 lockmgr(&bo->glob->lru_lock, LK_EXCLUSIVE);
1210                 ttm_bo_add_to_lru(bo);
1211                 lockmgr(&bo->glob->lru_lock, LK_RELEASE);
1212         }
1213
1214         if (unlikely(ret))
1215                 ttm_bo_unref(&bo);
1216
1217         return ret;
1218 }
1219 EXPORT_SYMBOL(ttm_bo_init);
1220
1221 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1222                        unsigned long bo_size,
1223                        unsigned struct_size)
1224 {
1225         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1226         size_t size = 0;
1227
1228         size += ttm_round_pot(struct_size);
1229         size += ttm_round_pot(npages * sizeof(void *));
1230         size += ttm_round_pot(sizeof(struct ttm_tt));
1231         return size;
1232 }
1233 EXPORT_SYMBOL(ttm_bo_acc_size);
1234
1235 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1236                            unsigned long bo_size,
1237                            unsigned struct_size)
1238 {
1239         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1240         size_t size = 0;
1241
1242         size += ttm_round_pot(struct_size);
1243         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1244         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1245         return size;
1246 }
1247 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1248
1249 int ttm_bo_create(struct ttm_bo_device *bdev,
1250                         unsigned long size,
1251                         enum ttm_bo_type type,
1252                         struct ttm_placement *placement,
1253                         uint32_t page_alignment,
1254                         bool interruptible,
1255                         struct vm_object *persistent_swap_storage,
1256                         struct ttm_buffer_object **p_bo)
1257 {
1258         struct ttm_buffer_object *bo;
1259         size_t acc_size;
1260         int ret;
1261
1262         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1263         if (unlikely(bo == NULL))
1264                 return -ENOMEM;
1265
1266         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1267         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1268                           interruptible, persistent_swap_storage, acc_size,
1269                           NULL, NULL, NULL);
1270         if (likely(ret == 0))
1271                 *p_bo = bo;
1272
1273         return ret;
1274 }
1275 EXPORT_SYMBOL(ttm_bo_create);
1276
1277 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1278                                         unsigned mem_type, bool allow_errors)
1279 {
1280         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1281         struct ttm_bo_global *glob = bdev->glob;
1282         int ret;
1283
1284         /*
1285          * Can't use standard list traversal since we're unlocking.
1286          */
1287
1288         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1289         while (!list_empty(&man->lru)) {
1290                 lockmgr(&glob->lru_lock, LK_RELEASE);
1291                 ret = ttm_mem_evict_first(bdev, mem_type, NULL, false, false);
1292                 if (ret) {
1293                         if (allow_errors) {
1294                                 return ret;
1295                         } else {
1296                                 pr_err("Cleanup eviction failed\n");
1297                         }
1298                 }
1299                 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1300         }
1301         lockmgr(&glob->lru_lock, LK_RELEASE);
1302         return 0;
1303 }
1304
1305 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1306 {
1307         struct ttm_mem_type_manager *man;
1308         int ret = -EINVAL;
1309
1310         if (mem_type >= TTM_NUM_MEM_TYPES) {
1311                 pr_err("Illegal memory type %d\n", mem_type);
1312                 return ret;
1313         }
1314         man = &bdev->man[mem_type];
1315
1316         if (!man->has_type) {
1317                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1318                        mem_type);
1319                 return ret;
1320         }
1321
1322         man->use_type = false;
1323         man->has_type = false;
1324
1325         ret = 0;
1326         if (mem_type > 0) {
1327                 ttm_bo_force_list_clean(bdev, mem_type, false);
1328
1329                 ret = (*man->func->takedown)(man);
1330         }
1331
1332         return ret;
1333 }
1334 EXPORT_SYMBOL(ttm_bo_clean_mm);
1335
1336 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1337 {
1338         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1339
1340         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1341                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1342                 return -EINVAL;
1343         }
1344
1345         if (!man->has_type) {
1346                 pr_err("Memory type %u has not been initialized\n", mem_type);
1347                 return 0;
1348         }
1349
1350         return ttm_bo_force_list_clean(bdev, mem_type, true);
1351 }
1352 EXPORT_SYMBOL(ttm_bo_evict_mm);
1353
1354 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1355                         unsigned long p_size)
1356 {
1357         int ret = -EINVAL;
1358         struct ttm_mem_type_manager *man;
1359
1360         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1361         man = &bdev->man[type];
1362         BUG_ON(man->has_type);
1363         man->io_reserve_fastpath = true;
1364         man->use_io_reserve_lru = false;
1365         lockinit(&man->io_reserve_mutex, "ttmior", 0, 0);
1366         INIT_LIST_HEAD(&man->io_reserve_lru);
1367
1368         ret = bdev->driver->init_mem_type(bdev, type, man);
1369         if (ret)
1370                 return ret;
1371         man->bdev = bdev;
1372
1373         ret = 0;
1374         if (type != TTM_PL_SYSTEM) {
1375                 ret = (*man->func->init)(man, p_size);
1376                 if (ret)
1377                         return ret;
1378         }
1379         man->has_type = true;
1380         man->use_type = true;
1381         man->size = p_size;
1382
1383         INIT_LIST_HEAD(&man->lru);
1384
1385         return 0;
1386 }
1387 EXPORT_SYMBOL(ttm_bo_init_mm);
1388
1389 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1390 {
1391         struct ttm_bo_global *glob =
1392                 container_of(kobj, struct ttm_bo_global, kobj);
1393
1394         ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
1395         __free_page(glob->dummy_read_page);
1396         kfree(glob);
1397 }
1398
1399 void ttm_bo_global_release(struct drm_global_reference *ref)
1400 {
1401         struct ttm_bo_global *glob = ref->object;
1402
1403         kobject_del(&glob->kobj);
1404         kobject_put(&glob->kobj);
1405 }
1406 EXPORT_SYMBOL(ttm_bo_global_release);
1407
1408 int ttm_bo_global_init(struct drm_global_reference *ref)
1409 {
1410         struct ttm_bo_global_ref *bo_ref =
1411                 container_of(ref, struct ttm_bo_global_ref, ref);
1412         struct ttm_bo_global *glob = ref->object;
1413         int ret;
1414
1415         lockinit(&glob->device_list_mutex, "ttmdlm", 0, 0);
1416         lockinit(&glob->lru_lock, "ttmlru", 0, 0);
1417         glob->mem_glob = bo_ref->mem_glob;
1418         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1419
1420         if (unlikely(glob->dummy_read_page == NULL)) {
1421                 ret = -ENOMEM;
1422                 goto out_no_drp;
1423         }
1424
1425         INIT_LIST_HEAD(&glob->swap_lru);
1426         INIT_LIST_HEAD(&glob->device_list);
1427
1428         ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
1429         ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
1430         if (unlikely(ret != 0)) {
1431                 pr_err("Could not register buffer object swapout\n");
1432                 goto out_no_shrink;
1433         }
1434
1435         atomic_set(&glob->bo_count, 0);
1436
1437         ret = kobject_init_and_add(
1438                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1439         if (unlikely(ret != 0))
1440                 kobject_put(&glob->kobj);
1441         return ret;
1442 out_no_shrink:
1443         __free_page(glob->dummy_read_page);
1444 out_no_drp:
1445         kfree(glob);
1446         return ret;
1447 }
1448 EXPORT_SYMBOL(ttm_bo_global_init);
1449
1450
1451 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1452 {
1453         int ret = 0;
1454         unsigned i = TTM_NUM_MEM_TYPES;
1455         struct ttm_mem_type_manager *man;
1456         struct ttm_bo_global *glob = bdev->glob;
1457
1458         while (i--) {
1459                 man = &bdev->man[i];
1460                 if (man->has_type) {
1461                         man->use_type = false;
1462                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1463                                 ret = -EBUSY;
1464                                 pr_err("DRM memory manager type %d is not clean\n",
1465                                        i);
1466                         }
1467                         man->has_type = false;
1468                 }
1469         }
1470
1471         mutex_lock(&glob->device_list_mutex);
1472         list_del(&bdev->device_list);
1473         mutex_unlock(&glob->device_list_mutex);
1474
1475         cancel_delayed_work_sync(&bdev->wq);
1476
1477         while (ttm_bo_delayed_delete(bdev, true))
1478                 ;
1479
1480         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1481         if (list_empty(&bdev->ddestroy))
1482                 TTM_DEBUG("Delayed destroy list was clean\n");
1483
1484         if (list_empty(&bdev->man[0].lru))
1485                 TTM_DEBUG("Swap list was clean\n");
1486         lockmgr(&glob->lru_lock, LK_RELEASE);
1487
1488         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1489
1490         return ret;
1491 }
1492 EXPORT_SYMBOL(ttm_bo_device_release);
1493
1494 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1495                        struct ttm_bo_global *glob,
1496                        struct ttm_bo_driver *driver,
1497                        struct address_space *mapping,
1498                        uint64_t file_page_offset,
1499                        bool need_dma32)
1500 {
1501         int ret = -EINVAL;
1502
1503         bdev->driver = driver;
1504
1505         memset(bdev->man, 0, sizeof(bdev->man));
1506
1507         /*
1508          * Initialize the system memory buffer type.
1509          * Other types need to be driver / IOCTL initialized.
1510          */
1511         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1512         if (unlikely(ret != 0))
1513                 goto out_no_sys;
1514
1515         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1516                                     0x10000000);
1517         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1518         INIT_LIST_HEAD(&bdev->ddestroy);
1519         /*
1520          * XXX DRAGONFLY - dev_mapping NULL atm, find other XXX DRAGONFLY
1521          * lines and fix when it no longer is in later API change.
1522          */
1523         bdev->dev_mapping = mapping;
1524         bdev->glob = glob;
1525         bdev->need_dma32 = need_dma32;
1526         mutex_lock(&glob->device_list_mutex);
1527         list_add_tail(&bdev->device_list, &glob->device_list);
1528         mutex_unlock(&glob->device_list_mutex);
1529
1530         return 0;
1531 out_no_sys:
1532         return ret;
1533 }
1534 EXPORT_SYMBOL(ttm_bo_device_init);
1535
1536 /*
1537  * buffer object vm functions.
1538  */
1539
1540 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1541 {
1542         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1543
1544         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1545                 if (mem->mem_type == TTM_PL_SYSTEM)
1546                         return false;
1547
1548                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1549                         return false;
1550
1551                 if (mem->placement & TTM_PL_FLAG_CACHED)
1552                         return false;
1553         }
1554         return true;
1555 }
1556
1557 #ifdef __DragonFly__
1558
1559 /*
1560  * XXX DRAGONFLY - device_mapping not yet implemented so
1561  * file_mapping is basically always NULL.  We have to properly
1562  * release the mmap, etc.
1563 */
1564 void ttm_bo_release_mmap(struct ttm_buffer_object *bo);
1565
1566 /**
1567  * drm_vma_node_unmap() - Unmap offset node
1568  * @node: Offset node
1569  * @file_mapping: Address space to unmap @node from
1570  *
1571  * Unmap all userspace mappings for a given offset node. The mappings must be
1572  * associated with the @file_mapping address-space. If no offset exists or
1573  * the address-space is invalid, nothing is done.
1574  *
1575  * This call is unlocked. The caller must guarantee that drm_vma_offset_remove()
1576  * is not called on this node concurrently.
1577  */
1578 static inline void drm_vma_node_unmap(struct drm_vma_offset_node *node,
1579                                       struct address_space *file_mapping)
1580 {
1581         struct ttm_buffer_object *bo = container_of(node, struct ttm_buffer_object, vma_node);
1582
1583         if (drm_vma_node_has_offset(node))
1584                 unmap_mapping_range(file_mapping,
1585                                     drm_vma_node_offset_addr(node),
1586                                     drm_vma_node_size(node) << PAGE_SHIFT, 1);
1587         ttm_bo_release_mmap(bo);
1588 }
1589 #endif
1590
1591 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1592 {
1593         struct ttm_bo_device *bdev = bo->bdev;
1594
1595         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1596         ttm_mem_io_free_vm(bo);
1597 }
1598
1599 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1600 {
1601         struct ttm_bo_device *bdev = bo->bdev;
1602         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1603
1604         ttm_mem_io_lock(man, false);
1605         ttm_bo_unmap_virtual_locked(bo);
1606         ttm_mem_io_unlock(man);
1607 }
1608
1609
1610 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1611
1612 int ttm_bo_wait(struct ttm_buffer_object *bo,
1613                 bool interruptible, bool no_wait)
1614 {
1615         struct reservation_object_list *fobj;
1616         struct reservation_object *resv;
1617         struct fence *excl;
1618         long timeout = 15 * HZ;
1619         int i;
1620
1621         resv = bo->resv;
1622         fobj = reservation_object_get_list(resv);
1623         excl = reservation_object_get_excl(resv);
1624         if (excl) {
1625                 if (!fence_is_signaled(excl)) {
1626                         if (no_wait)
1627                                 return -EBUSY;
1628
1629                         timeout = fence_wait_timeout(excl,
1630                                                      interruptible, timeout);
1631                 }
1632         }
1633
1634         for (i = 0; fobj && timeout > 0 && i < fobj->shared_count; ++i) {
1635                 struct fence *fence;
1636                 fence = rcu_dereference_protected(fobj->shared[i],
1637                                                 reservation_object_held(resv));
1638
1639                 if (!fence_is_signaled(fence)) {
1640                         if (no_wait)
1641                                 return -EBUSY;
1642
1643                         timeout = fence_wait_timeout(fence,
1644                                                      interruptible, timeout);
1645                 }
1646         }
1647
1648         if (timeout < 0)
1649                 return timeout;
1650
1651         if (timeout == 0)
1652                 return -EBUSY;
1653
1654         reservation_object_add_excl_fence(resv, NULL);
1655         clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
1656         return 0;
1657 }
1658 EXPORT_SYMBOL(ttm_bo_wait);
1659
1660 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1661 {
1662         int ret = 0;
1663
1664         /*
1665          * Using ttm_bo_reserve makes sure the lru lists are updated.
1666          */
1667
1668         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1669         if (unlikely(ret != 0))
1670                 return ret;
1671         ret = ttm_bo_wait(bo, true, no_wait);
1672         if (likely(ret == 0))
1673                 atomic_inc(&bo->cpu_writers);
1674         ttm_bo_unreserve(bo);
1675         return ret;
1676 }
1677 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1678
1679 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1680 {
1681         atomic_dec(&bo->cpu_writers);
1682 }
1683 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1684
1685 /**
1686  * A buffer object shrink method that tries to swap out the first
1687  * buffer object on the bo_global::swap_lru list.
1688  */
1689
1690 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
1691 {
1692         struct ttm_bo_global *glob =
1693             container_of(shrink, struct ttm_bo_global, shrink);
1694         struct ttm_buffer_object *bo;
1695         int ret = -EBUSY;
1696         int put_count;
1697         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
1698
1699         lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
1700         list_for_each_entry(bo, &glob->swap_lru, swap) {
1701                 ret = __ttm_bo_reserve(bo, false, true, NULL);
1702                 if (!ret)
1703                         break;
1704         }
1705
1706         if (ret) {
1707                 lockmgr(&glob->lru_lock, LK_RELEASE);
1708                 return ret;
1709         }
1710
1711         kref_get(&bo->list_kref);
1712
1713         if (!list_empty(&bo->ddestroy)) {
1714                 ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false);
1715                 kref_put(&bo->list_kref, ttm_bo_release_list);
1716                 return ret;
1717         }
1718
1719         put_count = ttm_bo_del_from_lru(bo);
1720         lockmgr(&glob->lru_lock, LK_RELEASE);
1721
1722         ttm_bo_list_ref_sub(bo, put_count, true);
1723
1724         /**
1725          * Wait for GPU, then move to system cached.
1726          */
1727
1728         ret = ttm_bo_wait(bo, false, false);
1729
1730         if (unlikely(ret != 0))
1731                 goto out;
1732
1733         if ((bo->mem.placement & swap_placement) != swap_placement) {
1734                 struct ttm_mem_reg evict_mem;
1735
1736                 evict_mem = bo->mem;
1737                 evict_mem.mm_node = NULL;
1738                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1739                 evict_mem.mem_type = TTM_PL_SYSTEM;
1740
1741                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
1742                                              false, false);
1743                 if (unlikely(ret != 0))
1744                         goto out;
1745         }
1746
1747         ttm_bo_unmap_virtual(bo);
1748
1749         /**
1750          * Swap out. Buffer will be swapped in again as soon as
1751          * anyone tries to access a ttm page.
1752          */
1753
1754         if (bo->bdev->driver->swap_notify)
1755                 bo->bdev->driver->swap_notify(bo);
1756
1757         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1758 out:
1759
1760         /**
1761          *
1762          * Unreserve without putting on LRU to avoid swapping out an
1763          * already swapped buffer.
1764          */
1765
1766         __ttm_bo_unreserve(bo);
1767         kref_put(&bo->list_kref, ttm_bo_release_list);
1768         return ret;
1769 }
1770
1771 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1772 {
1773         while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
1774                 ;
1775 }
1776 EXPORT_SYMBOL(ttm_bo_swapout_all);
1777
1778 /**
1779  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1780  * unreserved
1781  *
1782  * @bo: Pointer to buffer
1783  */
1784 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1785 {
1786         int ret;
1787
1788         /*
1789          * In the absense of a wait_unlocked API,
1790          * Use the bo::wu_mutex to avoid triggering livelocks due to
1791          * concurrent use of this function. Note that this use of
1792          * bo::wu_mutex can go away if we change locking order to
1793          * mmap_sem -> bo::reserve.
1794          */
1795         ret = mutex_lock_interruptible(&bo->wu_mutex);
1796         if (unlikely(ret != 0))
1797                 return -ERESTARTSYS;
1798         if (!ww_mutex_is_locked(&bo->resv->lock))
1799                 goto out_unlock;
1800         ret = __ttm_bo_reserve(bo, true, false, NULL);
1801         if (unlikely(ret != 0))
1802                 goto out_unlock;
1803         __ttm_bo_unreserve(bo);
1804
1805 out_unlock:
1806         mutex_unlock(&bo->wu_mutex);
1807         return ret;
1808 }