drivers/gpu/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 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  46
  47 static struct attribute ttm_bo_count = {
  48         .name = "bo_count",
  49         .mode = S_IRUGO
  50 };
  51
  52 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
  53                                           uint32_t *mem_type)
  54 {
  55         int pos;
  56
  57         pos = ffs(place->flags & TTM_PL_MASK_MEM);
  58         if (unlikely(!pos))
  59                 return -EINVAL;
  60
  61         *mem_type = pos - 1;
  62         return 0;
  63 }
  64
  65 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)
  66 {
  67         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  68         struct drm_printer p = drm_debug_printer(TTM_PFX);
  69
  70         pr_err("    has_type: %d\n", man->has_type);
  71         pr_err("    use_type: %d\n", man->use_type);
  72         pr_err("    flags: 0x%08X\n", man->flags);
  73         pr_err("    gpu_offset: 0x%08llX\n", man->gpu_offset);
  74         pr_err("    size: %llu\n", man->size);
  75         pr_err("    available_caching: 0x%08X\n", man->available_caching);
  76         pr_err("    default_caching: 0x%08X\n", man->default_caching);
  77         if (mem_type != TTM_PL_SYSTEM)
  78                 (*man->func->debug)(man, &p);
  79 }
  80
  81 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  82                                         struct ttm_placement *placement)
  83 {
  84         int i, ret, mem_type;
  85
  86         pr_err("No space for %p (%lu pages, %luK, %luM)\n",
  87                bo, bo->mem.num_pages, bo->mem.size >> 10,
  88                bo->mem.size >> 20);
  89         for (i = 0; i < placement->num_placement; i++) {
  90                 ret = ttm_mem_type_from_place(&placement->placement[i],
  91                                                 &mem_type);
  92                 if (ret)
  93                         return;
  94                 pr_err("  placement[%d]=0x%08X (%d)\n",
  95                        i, placement->placement[i].flags, mem_type);
  96                 ttm_mem_type_debug(bo->bdev, mem_type);
  97         }
  98 }
  99
 100 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 101                                   struct attribute *attr,
 102                                   char *buffer)
 103 {
 104         struct ttm_bo_global *glob =
 105                 container_of(kobj, struct ttm_bo_global, kobj);
 106
 107         return snprintf(buffer, PAGE_SIZE, "%d\n",
 108                                 atomic_read(&glob->bo_count));
 109 }
 110
 111 static struct attribute *ttm_bo_global_attrs[] = {
 112         &ttm_bo_count,
 113         NULL
 114 };
 115
 116 static const struct sysfs_ops ttm_bo_global_ops = {
 117         .show = &ttm_bo_global_show
 118 };
 119
 120 static struct kobj_type ttm_bo_glob_kobj_type  = {
 121         .release = &ttm_bo_global_kobj_release,
 122         .sysfs_ops = &ttm_bo_global_ops,
 123         .default_attrs = ttm_bo_global_attrs
 124 };
 125
 126
 127 static inline uint32_t ttm_bo_type_flags(unsigned type)
 128 {
 129         return 1 << (type);
 130 }
 131
 132 static void ttm_bo_release_list(struct kref *list_kref)
 133 {
 134         struct ttm_buffer_object *bo =
 135             container_of(list_kref, struct ttm_buffer_object, list_kref);
 136         struct ttm_bo_device *bdev = bo->bdev;
 137         size_t acc_size = bo->acc_size;
 138
 139         BUG_ON(kref_read(&bo->list_kref));
 140         BUG_ON(kref_read(&bo->kref));
 141         BUG_ON(atomic_read(&bo->cpu_writers));
 142         BUG_ON(bo->mem.mm_node != NULL);
 143         BUG_ON(!list_empty(&bo->lru));
 144         BUG_ON(!list_empty(&bo->ddestroy));
 145         ttm_tt_destroy(bo->ttm);
 146         atomic_dec(&bo->glob->bo_count);
 147         dma_fence_put(bo->moving);
 148         reservation_object_fini(&bo->ttm_resv);
 149         mutex_destroy(&bo->wu_mutex);
 150         if (bo->destroy)
 151                 bo->destroy(bo);
 152         else {
 153                 kfree(bo);
 154         }
 155         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 156 }
 157
 158 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 159 {
 160         struct ttm_bo_device *bdev = bo->bdev;
 161         struct ttm_mem_type_manager *man;
 162
 163         reservation_object_assert_held(bo->resv);
 164
 165         if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 166
 167                 BUG_ON(!list_empty(&bo->lru));
 168
 169                 man = &bdev->man[bo->mem.mem_type];
 170                 list_add_tail(&bo->lru, &man->lru[bo->priority]);
 171                 kref_get(&bo->list_kref);
 172
 173                 if (bo->ttm && !(bo->ttm->page_flags &
 174                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED))) {
 175                         list_add_tail(&bo->swap,
 176                                       &bo->glob->swap_lru[bo->priority]);
 177                         kref_get(&bo->list_kref);
 178                 }
 179         }
 180 }
 181 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 182
 183 static void ttm_bo_ref_bug(struct kref *list_kref)
 184 {
 185         BUG();
 186 }
 187
 188 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 189 {
 190         if (!list_empty(&bo->swap)) {
 191                 list_del_init(&bo->swap);
 192                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 193         }
 194         if (!list_empty(&bo->lru)) {
 195                 list_del_init(&bo->lru);
 196                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 197         }
 198
 199         /*
 200          * TODO: Add a driver hook to delete from
 201          * driver-specific LRU's here.
 202          */
 203 }
 204
 205 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 206 {
 207         spin_lock(&bo->glob->lru_lock);
 208         ttm_bo_del_from_lru(bo);
 209         spin_unlock(&bo->glob->lru_lock);
 210 }
 211 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 212
 213 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
 214 {
 215         reservation_object_assert_held(bo->resv);
 216
 217         ttm_bo_del_from_lru(bo);
 218         ttm_bo_add_to_lru(bo);
 219 }
 220 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 221
 222 /*
 223  * Call bo->mutex locked.
 224  */
 225 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 226 {
 227         struct ttm_bo_device *bdev = bo->bdev;
 228         struct ttm_bo_global *glob = bo->glob;
 229         int ret = 0;
 230         uint32_t page_flags = 0;
 231
 232         reservation_object_assert_held(bo->resv);
 233         bo->ttm = NULL;
 234
 235         if (bdev->need_dma32)
 236                 page_flags |= TTM_PAGE_FLAG_DMA32;
 237
 238         switch (bo->type) {
 239         case ttm_bo_type_device:
 240                 if (zero_alloc)
 241                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
 242         case ttm_bo_type_kernel:
 243                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 244                                                       page_flags, glob->dummy_read_page);
 245                 if (unlikely(bo->ttm == NULL))
 246                         ret = -ENOMEM;
 247                 break;
 248         case ttm_bo_type_sg:
 249                 bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
 250                                                       page_flags | TTM_PAGE_FLAG_SG,
 251                                                       glob->dummy_read_page);
 252                 if (unlikely(bo->ttm == NULL)) {
 253                         ret = -ENOMEM;
 254                         break;
 255                 }
 256                 bo->ttm->sg = bo->sg;
 257                 break;
 258         default:
 259                 pr_err("Illegal buffer object type\n");
 260                 ret = -EINVAL;
 261                 break;
 262         }
 263
 264         return ret;
 265 }
 266
 267 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 268                                   struct ttm_mem_reg *mem, bool evict,
 269                                   struct ttm_operation_ctx *ctx)
 270 {
 271         struct ttm_bo_device *bdev = bo->bdev;
 272         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 273         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 274         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 275         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 276         int ret = 0;
 277
 278         if (old_is_pci || new_is_pci ||
 279             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 280                 ret = ttm_mem_io_lock(old_man, true);
 281                 if (unlikely(ret != 0))
 282                         goto out_err;
 283                 ttm_bo_unmap_virtual_locked(bo);
 284                 ttm_mem_io_unlock(old_man);
 285         }
 286
 287         /*
 288          * Create and bind a ttm if required.
 289          */
 290
 291         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 292                 if (bo->ttm == NULL) {
 293                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 294                         ret = ttm_bo_add_ttm(bo, zero);
 295                         if (ret)
 296                                 goto out_err;
 297                 }
 298
 299                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 300                 if (ret)
 301                         goto out_err;
 302
 303                 if (mem->mem_type != TTM_PL_SYSTEM) {
 304                         ret = ttm_tt_bind(bo->ttm, mem, ctx);
 305                         if (ret)
 306                                 goto out_err;
 307                 }
 308
 309                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 310                         if (bdev->driver->move_notify)
 311                                 bdev->driver->move_notify(bo, evict, mem);
 312                         bo->mem = *mem;
 313                         mem->mm_node = NULL;
 314                         goto moved;
 315                 }
 316         }
 317
 318         if (bdev->driver->move_notify)
 319                 bdev->driver->move_notify(bo, evict, mem);
 320
 321         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 322             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 323                 ret = ttm_bo_move_ttm(bo, ctx, mem);
 324         else if (bdev->driver->move)
 325                 ret = bdev->driver->move(bo, evict, ctx, mem);
 326         else
 327                 ret = ttm_bo_move_memcpy(bo, ctx, mem);
 328
 329         if (ret) {
 330                 if (bdev->driver->move_notify) {
 331                         struct ttm_mem_reg tmp_mem = *mem;
 332                         *mem = bo->mem;
 333                         bo->mem = tmp_mem;
 334                         bdev->driver->move_notify(bo, false, mem);
 335                         bo->mem = *mem;
 336                         *mem = tmp_mem;
 337                 }
 338
 339                 goto out_err;
 340         }
 341
 342 moved:
 343         if (bo->evicted) {
 344                 if (bdev->driver->invalidate_caches) {
 345                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 346                         if (ret)
 347                                 pr_err("Can not flush read caches\n");
 348                 }
 349                 bo->evicted = false;
 350         }
 351
 352         if (bo->mem.mm_node)
 353                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 354                     bdev->man[bo->mem.mem_type].gpu_offset;
 355         else
 356                 bo->offset = 0;
 357
 358         ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
 359         return 0;
 360
 361 out_err:
 362         new_man = &bdev->man[bo->mem.mem_type];
 363         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 364                 ttm_tt_destroy(bo->ttm);
 365                 bo->ttm = NULL;
 366         }
 367
 368         return ret;
 369 }
 370
 371 /**
 372  * Call bo::reserved.
 373  * Will release GPU memory type usage on destruction.
 374  * This is the place to put in driver specific hooks to release
 375  * driver private resources.
 376  * Will release the bo::reserved lock.
 377  */
 378
 379 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 380 {
 381         if (bo->bdev->driver->move_notify)
 382                 bo->bdev->driver->move_notify(bo, false, NULL);
 383
 384         ttm_tt_destroy(bo->ttm);
 385         bo->ttm = NULL;
 386         ttm_bo_mem_put(bo, &bo->mem);
 387 }
 388
 389 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 390 {
 391         int r;
 392
 393         if (bo->resv == &bo->ttm_resv)
 394                 return 0;
 395
 396         BUG_ON(!reservation_object_trylock(&bo->ttm_resv));
 397
 398         r = reservation_object_copy_fences(&bo->ttm_resv, bo->resv);
 399         if (r)
 400                 reservation_object_unlock(&bo->ttm_resv);
 401
 402         return r;
 403 }
 404
 405 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 406 {
 407         struct reservation_object_list *fobj;
 408         struct dma_fence *fence;
 409         int i;
 410
 411         fobj = reservation_object_get_list(&bo->ttm_resv);
 412         fence = reservation_object_get_excl(&bo->ttm_resv);
 413         if (fence && !fence->ops->signaled)
 414                 dma_fence_enable_sw_signaling(fence);
 415
 416         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 417                 fence = rcu_dereference_protected(fobj->shared[i],
 418                                         reservation_object_held(bo->resv));
 419
 420                 if (!fence->ops->signaled)
 421                         dma_fence_enable_sw_signaling(fence);
 422         }
 423 }
 424
 425 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 426 {
 427         struct ttm_bo_device *bdev = bo->bdev;
 428         struct ttm_bo_global *glob = bo->glob;
 429         int ret;
 430
 431         ret = ttm_bo_individualize_resv(bo);
 432         if (ret) {
 433                 /* Last resort, if we fail to allocate memory for the
 434                  * fences block for the BO to become idle
 435                  */
 436                 reservation_object_wait_timeout_rcu(bo->resv, true, false,
 437                                                     30 * HZ);
 438                 spin_lock(&glob->lru_lock);
 439                 goto error;
 440         }
 441
 442         spin_lock(&glob->lru_lock);
 443         ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
 444         if (!ret) {
 445                 if (reservation_object_test_signaled_rcu(&bo->ttm_resv, true)) {
 446                         ttm_bo_del_from_lru(bo);
 447                         spin_unlock(&glob->lru_lock);
 448                         if (bo->resv != &bo->ttm_resv)
 449                                 reservation_object_unlock(&bo->ttm_resv);
 450
 451                         ttm_bo_cleanup_memtype_use(bo);
 452                         reservation_object_unlock(bo->resv);
 453                         return;
 454                 }
 455
 456                 ttm_bo_flush_all_fences(bo);
 457
 458                 /*
 459                  * Make NO_EVICT bos immediately available to
 460                  * shrinkers, now that they are queued for
 461                  * destruction.
 462                  */
 463                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 464                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 465                         ttm_bo_add_to_lru(bo);
 466                 }
 467
 468                 reservation_object_unlock(bo->resv);
 469         }
 470         if (bo->resv != &bo->ttm_resv)
 471                 reservation_object_unlock(&bo->ttm_resv);
 472
 473 error:
 474         kref_get(&bo->list_kref);
 475         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 476         spin_unlock(&glob->lru_lock);
 477
 478         schedule_delayed_work(&bdev->wq,
 479                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 480 }
 481
 482 /**
 483  * function ttm_bo_cleanup_refs
 484  * If bo idle, remove from delayed- and lru lists, and unref.
 485  * If not idle, do nothing.
 486  *
 487  * Must be called with lru_lock and reservation held, this function
 488  * will drop the lru lock and optionally the reservation lock before returning.
 489  *
 490  * @interruptible         Any sleeps should occur interruptibly.
 491  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 492  * @unlock_resv           Unlock the reservation lock as well.
 493  */
 494
 495 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 496                                bool interruptible, bool no_wait_gpu,
 497                                bool unlock_resv)
 498 {
 499         struct ttm_bo_global *glob = bo->glob;
 500         struct reservation_object *resv;
 501         int ret;
 502
 503         if (unlikely(list_empty(&bo->ddestroy)))
 504                 resv = bo->resv;
 505         else
 506                 resv = &bo->ttm_resv;
 507
 508         if (reservation_object_test_signaled_rcu(resv, true))
 509                 ret = 0;
 510         else
 511                 ret = -EBUSY;
 512
 513         if (ret && !no_wait_gpu) {
 514                 long lret;
 515
 516                 if (unlock_resv)
 517                         reservation_object_unlock(bo->resv);
 518                 spin_unlock(&glob->lru_lock);
 519
 520                 lret = reservation_object_wait_timeout_rcu(resv, true,
 521                                                            interruptible,
 522                                                            30 * HZ);
 523
 524                 if (lret < 0)
 525                         return lret;
 526                 else if (lret == 0)
 527                         return -EBUSY;
 528
 529                 spin_lock(&glob->lru_lock);
 530                 if (unlock_resv && !reservation_object_trylock(bo->resv)) {
 531                         /*
 532                          * We raced, and lost, someone else holds the reservation now,
 533                          * and is probably busy in ttm_bo_cleanup_memtype_use.
 534                          *
 535                          * Even if it's not the case, because we finished waiting any
 536                          * delayed destruction would succeed, so just return success
 537                          * here.
 538                          */
 539                         spin_unlock(&glob->lru_lock);
 540                         return 0;
 541                 }
 542                 ret = 0;
 543         }
 544
 545         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 546                 if (unlock_resv)
 547                         reservation_object_unlock(bo->resv);
 548                 spin_unlock(&glob->lru_lock);
 549                 return ret;
 550         }
 551
 552         ttm_bo_del_from_lru(bo);
 553         list_del_init(&bo->ddestroy);
 554         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 555
 556         spin_unlock(&glob->lru_lock);
 557         ttm_bo_cleanup_memtype_use(bo);
 558
 559         if (unlock_resv)
 560                 reservation_object_unlock(bo->resv);
 561
 562         return 0;
 563 }
 564
 565 /**
 566  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 567  * encountered buffers.
 568  */
 569 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 570 {
 571         struct ttm_bo_global *glob = bdev->glob;
 572         struct list_head removed;
 573         bool empty;
 574
 575         INIT_LIST_HEAD(&removed);
 576
 577         spin_lock(&glob->lru_lock);
 578         while (!list_empty(&bdev->ddestroy)) {
 579                 struct ttm_buffer_object *bo;
 580
 581                 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
 582                                       ddestroy);
 583                 kref_get(&bo->list_kref);
 584                 list_move_tail(&bo->ddestroy, &removed);
 585
 586                 if (remove_all || bo->resv != &bo->ttm_resv) {
 587                         spin_unlock(&glob->lru_lock);
 588                         reservation_object_lock(bo->resv, NULL);
 589
 590                         spin_lock(&glob->lru_lock);
 591                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 592
 593                 } else if (reservation_object_trylock(bo->resv)) {
 594                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 595                 } else {
 596                         spin_unlock(&glob->lru_lock);
 597                 }
 598
 599                 kref_put(&bo->list_kref, ttm_bo_release_list);
 600                 spin_lock(&glob->lru_lock);
 601         }
 602         list_splice_tail(&removed, &bdev->ddestroy);
 603         empty = list_empty(&bdev->ddestroy);
 604         spin_unlock(&glob->lru_lock);
 605
 606         return empty;
 607 }
 608
 609 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 610 {
 611         struct ttm_bo_device *bdev =
 612             container_of(work, struct ttm_bo_device, wq.work);
 613
 614         if (!ttm_bo_delayed_delete(bdev, false)) {
 615                 schedule_delayed_work(&bdev->wq,
 616                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 617         }
 618 }
 619
 620 static void ttm_bo_release(struct kref *kref)
 621 {
 622         struct ttm_buffer_object *bo =
 623             container_of(kref, struct ttm_buffer_object, kref);
 624         struct ttm_bo_device *bdev = bo->bdev;
 625         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 626
 627         drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);
 628         ttm_mem_io_lock(man, false);
 629         ttm_mem_io_free_vm(bo);
 630         ttm_mem_io_unlock(man);
 631         ttm_bo_cleanup_refs_or_queue(bo);
 632         kref_put(&bo->list_kref, ttm_bo_release_list);
 633 }
 634
 635 void ttm_bo_unref(struct ttm_buffer_object **p_bo)
 636 {
 637         struct ttm_buffer_object *bo = *p_bo;
 638
 639         *p_bo = NULL;
 640         kref_put(&bo->kref, ttm_bo_release);
 641 }
 642 EXPORT_SYMBOL(ttm_bo_unref);
 643
 644 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 645 {
 646         return cancel_delayed_work_sync(&bdev->wq);
 647 }
 648 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 649
 650 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 651 {
 652         if (resched)
 653                 schedule_delayed_work(&bdev->wq,
 654                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 655 }
 656 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 657
 658 static int ttm_bo_evict(struct ttm_buffer_object *bo,
 659                         struct ttm_operation_ctx *ctx)
 660 {
 661         struct ttm_bo_device *bdev = bo->bdev;
 662         struct ttm_mem_reg evict_mem;
 663         struct ttm_placement placement;
 664         int ret = 0;
 665
 666         reservation_object_assert_held(bo->resv);
 667
 668         evict_mem = bo->mem;
 669         evict_mem.mm_node = NULL;
 670         evict_mem.bus.io_reserved_vm = false;
 671         evict_mem.bus.io_reserved_count = 0;
 672
 673         placement.num_placement = 0;
 674         placement.num_busy_placement = 0;
 675         bdev->driver->evict_flags(bo, &placement);
 676         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 677         if (ret) {
 678                 if (ret != -ERESTARTSYS) {
 679                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 680                                bo);
 681                         ttm_bo_mem_space_debug(bo, &placement);
 682                 }
 683                 goto out;
 684         }
 685
 686         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
 687         if (unlikely(ret)) {
 688                 if (ret != -ERESTARTSYS)
 689                         pr_err("Buffer eviction failed\n");
 690                 ttm_bo_mem_put(bo, &evict_mem);
 691                 goto out;
 692         }
 693         bo->evicted = true;
 694 out:
 695         return ret;
 696 }
 697
 698 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 699                               const struct ttm_place *place)
 700 {
 701         /* Don't evict this BO if it's outside of the
 702          * requested placement range
 703          */
 704         if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 705             (place->lpfn && place->lpfn <= bo->mem.start))
 706                 return false;
 707
 708         return true;
 709 }
 710 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 711
 712 /**
 713  * Check the target bo is allowable to be evicted or swapout, including cases:
 714  *
 715  * a. if share same reservation object with ctx->resv, have assumption
 716  * reservation objects should already be locked, so not lock again and
 717  * return true directly when either the opreation allow_reserved_eviction
 718  * or the target bo already is in delayed free list;
 719  *
 720  * b. Otherwise, trylock it.
 721  */
 722 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 723                         struct ttm_operation_ctx *ctx, bool *locked)
 724 {
 725         bool ret = false;
 726
 727         *locked = false;
 728         if (bo->resv == ctx->resv) {
 729                 reservation_object_assert_held(bo->resv);
 730                 if (ctx->allow_reserved_eviction || !list_empty(&bo->ddestroy))
 731                         ret = true;
 732         } else {
 733                 *locked = reservation_object_trylock(bo->resv);
 734                 ret = *locked;
 735         }
 736
 737         return ret;
 738 }
 739
 740 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 741                                uint32_t mem_type,
 742                                const struct ttm_place *place,
 743                                struct ttm_operation_ctx *ctx)
 744 {
 745         struct ttm_bo_global *glob = bdev->glob;
 746         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 747         struct ttm_buffer_object *bo = NULL;
 748         bool locked = false;
 749         unsigned i;
 750         int ret;
 751
 752         spin_lock(&glob->lru_lock);
 753         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 754                 list_for_each_entry(bo, &man->lru[i], lru) {
 755                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked))
 756                                 continue;
 757
 758                         if (place && !bdev->driver->eviction_valuable(bo,
 759                                                                       place)) {
 760                                 if (locked)
 761                                         reservation_object_unlock(bo->resv);
 762                                 continue;
 763                         }
 764                         break;
 765                 }
 766
 767                 /* If the inner loop terminated early, we have our candidate */
 768                 if (&bo->lru != &man->lru[i])
 769                         break;
 770
 771                 bo = NULL;
 772         }
 773
 774         if (!bo) {
 775                 spin_unlock(&glob->lru_lock);
 776                 return -EBUSY;
 777         }
 778
 779         kref_get(&bo->list_kref);
 780
 781         if (!list_empty(&bo->ddestroy)) {
 782                 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
 783                                           ctx->no_wait_gpu, locked);
 784                 kref_put(&bo->list_kref, ttm_bo_release_list);
 785                 return ret;
 786         }
 787
 788         ttm_bo_del_from_lru(bo);
 789         spin_unlock(&glob->lru_lock);
 790
 791         ret = ttm_bo_evict(bo, ctx);
 792         if (locked) {
 793                 ttm_bo_unreserve(bo);
 794         } else {
 795                 spin_lock(&glob->lru_lock);
 796                 ttm_bo_add_to_lru(bo);
 797                 spin_unlock(&glob->lru_lock);
 798         }
 799
 800         kref_put(&bo->list_kref, ttm_bo_release_list);
 801         return ret;
 802 }
 803
 804 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 805 {
 806         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 807
 808         if (mem->mm_node)
 809                 (*man->func->put_node)(man, mem);
 810 }
 811 EXPORT_SYMBOL(ttm_bo_mem_put);
 812
 813 /**
 814  * Add the last move fence to the BO and reserve a new shared slot.
 815  */
 816 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 817                                  struct ttm_mem_type_manager *man,
 818                                  struct ttm_mem_reg *mem)
 819 {
 820         struct dma_fence *fence;
 821         int ret;
 822
 823         spin_lock(&man->move_lock);
 824         fence = dma_fence_get(man->move);
 825         spin_unlock(&man->move_lock);
 826
 827         if (fence) {
 828                 reservation_object_add_shared_fence(bo->resv, fence);
 829
 830                 ret = reservation_object_reserve_shared(bo->resv);
 831                 if (unlikely(ret))
 832                         return ret;
 833
 834                 dma_fence_put(bo->moving);
 835                 bo->moving = fence;
 836         }
 837
 838         return 0;
 839 }
 840
 841 /**
 842  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 843  * space, or we've evicted everything and there isn't enough space.
 844  */
 845 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 846                                         uint32_t mem_type,
 847                                         const struct ttm_place *place,
 848                                         struct ttm_mem_reg *mem,
 849                                         struct ttm_operation_ctx *ctx)
 850 {
 851         struct ttm_bo_device *bdev = bo->bdev;
 852         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 853         int ret;
 854
 855         do {
 856                 ret = (*man->func->get_node)(man, bo, place, mem);
 857                 if (unlikely(ret != 0))
 858                         return ret;
 859                 if (mem->mm_node)
 860                         break;
 861                 ret = ttm_mem_evict_first(bdev, mem_type, place, ctx);
 862                 if (unlikely(ret != 0))
 863                         return ret;
 864         } while (1);
 865         mem->mem_type = mem_type;
 866         return ttm_bo_add_move_fence(bo, man, mem);
 867 }
 868
 869 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 870                                       uint32_t cur_placement,
 871                                       uint32_t proposed_placement)
 872 {
 873         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 874         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 875
 876         /**
 877          * Keep current caching if possible.
 878          */
 879
 880         if ((cur_placement & caching) != 0)
 881                 result |= (cur_placement & caching);
 882         else if ((man->default_caching & caching) != 0)
 883                 result |= man->default_caching;
 884         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
 885                 result |= TTM_PL_FLAG_CACHED;
 886         else if ((TTM_PL_FLAG_WC & caching) != 0)
 887                 result |= TTM_PL_FLAG_WC;
 888         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
 889                 result |= TTM_PL_FLAG_UNCACHED;
 890
 891         return result;
 892 }
 893
 894 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
 895                                  uint32_t mem_type,
 896                                  const struct ttm_place *place,
 897                                  uint32_t *masked_placement)
 898 {
 899         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
 900
 901         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
 902                 return false;
 903
 904         if ((place->flags & man->available_caching) == 0)
 905                 return false;
 906
 907         cur_flags |= (place->flags & man->available_caching);
 908
 909         *masked_placement = cur_flags;
 910         return true;
 911 }
 912
 913 /**
 914  * Creates space for memory region @mem according to its type.
 915  *
 916  * This function first searches for free space in compatible memory types in
 917  * the priority order defined by the driver.  If free space isn't found, then
 918  * ttm_bo_mem_force_space is attempted in priority order to evict and find
 919  * space.
 920  */
 921 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 922                         struct ttm_placement *placement,
 923                         struct ttm_mem_reg *mem,
 924                         struct ttm_operation_ctx *ctx)
 925 {
 926         struct ttm_bo_device *bdev = bo->bdev;
 927         struct ttm_mem_type_manager *man;
 928         uint32_t mem_type = TTM_PL_SYSTEM;
 929         uint32_t cur_flags = 0;
 930         bool type_found = false;
 931         bool type_ok = false;
 932         bool has_erestartsys = false;
 933         int i, ret;
 934
 935         ret = reservation_object_reserve_shared(bo->resv);
 936         if (unlikely(ret))
 937                 return ret;
 938
 939         mem->mm_node = NULL;
 940         for (i = 0; i < placement->num_placement; ++i) {
 941                 const struct ttm_place *place = &placement->placement[i];
 942
 943                 ret = ttm_mem_type_from_place(place, &mem_type);
 944                 if (ret)
 945                         return ret;
 946                 man = &bdev->man[mem_type];
 947                 if (!man->has_type || !man->use_type)
 948                         continue;
 949
 950                 type_ok = ttm_bo_mt_compatible(man, mem_type, place,
 951                                                 &cur_flags);
 952
 953                 if (!type_ok)
 954                         continue;
 955
 956                 type_found = true;
 957                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
 958                                                   cur_flags);
 959                 /*
 960                  * Use the access and other non-mapping-related flag bits from
 961                  * the memory placement flags to the current flags
 962                  */
 963                 ttm_flag_masked(&cur_flags, place->flags,
 964                                 ~TTM_PL_MASK_MEMTYPE);
 965
 966                 if (mem_type == TTM_PL_SYSTEM)
 967                         break;
 968
 969                 ret = (*man->func->get_node)(man, bo, place, mem);
 970                 if (unlikely(ret))
 971                         return ret;
 972
 973                 if (mem->mm_node) {
 974                         ret = ttm_bo_add_move_fence(bo, man, mem);
 975                         if (unlikely(ret)) {
 976                                 (*man->func->put_node)(man, mem);
 977                                 return ret;
 978                         }
 979                         break;
 980                 }
 981         }
 982
 983         if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {
 984                 mem->mem_type = mem_type;
 985                 mem->placement = cur_flags;
 986                 return 0;
 987         }
 988
 989         for (i = 0; i < placement->num_busy_placement; ++i) {
 990                 const struct ttm_place *place = &placement->busy_placement[i];
 991
 992                 ret = ttm_mem_type_from_place(place, &mem_type);
 993                 if (ret)
 994                         return ret;
 995                 man = &bdev->man[mem_type];
 996                 if (!man->has_type || !man->use_type)
 997                         continue;
 998                 if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
 999                         continue;
1000
1001                 type_found = true;
1002                 cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
1003                                                   cur_flags);
1004                 /*
1005                  * Use the access and other non-mapping-related flag bits from
1006                  * the memory placement flags to the current flags
1007                  */
1008                 ttm_flag_masked(&cur_flags, place->flags,
1009                                 ~TTM_PL_MASK_MEMTYPE);
1010
1011                 if (mem_type == TTM_PL_SYSTEM) {
1012                         mem->mem_type = mem_type;
1013                         mem->placement = cur_flags;
1014                         mem->mm_node = NULL;
1015                         return 0;
1016                 }
1017
1018                 ret = ttm_bo_mem_force_space(bo, mem_type, place, mem, ctx);
1019                 if (ret == 0 && mem->mm_node) {
1020                         mem->placement = cur_flags;
1021                         return 0;
1022                 }
1023                 if (ret == -ERESTARTSYS)
1024                         has_erestartsys = true;
1025         }
1026
1027         if (!type_found) {
1028                 pr_err(TTM_PFX "No compatible memory type found\n");
1029                 return -EINVAL;
1030         }
1031
1032         return (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;
1033 }
1034 EXPORT_SYMBOL(ttm_bo_mem_space);
1035
1036 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1037                               struct ttm_placement *placement,
1038                               struct ttm_operation_ctx *ctx)
1039 {
1040         int ret = 0;
1041         struct ttm_mem_reg mem;
1042
1043         reservation_object_assert_held(bo->resv);
1044
1045         mem.num_pages = bo->num_pages;
1046         mem.size = mem.num_pages << PAGE_SHIFT;
1047         mem.page_alignment = bo->mem.page_alignment;
1048         mem.bus.io_reserved_vm = false;
1049         mem.bus.io_reserved_count = 0;
1050         /*
1051          * Determine where to move the buffer.
1052          */
1053         ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1054         if (ret)
1055                 goto out_unlock;
1056         ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1057 out_unlock:
1058         if (ret && mem.mm_node)
1059                 ttm_bo_mem_put(bo, &mem);
1060         return ret;
1061 }
1062
1063 static bool ttm_bo_places_compat(const struct ttm_place *places,
1064                                  unsigned num_placement,
1065                                  struct ttm_mem_reg *mem,
1066                                  uint32_t *new_flags)
1067 {
1068         unsigned i;
1069
1070         for (i = 0; i < num_placement; i++) {
1071                 const struct ttm_place *heap = &places[i];
1072
1073                 if (mem->mm_node && (mem->start < heap->fpfn ||
1074                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1075                         continue;
1076
1077                 *new_flags = heap->flags;
1078                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1079                     (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1080                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1081                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1082                         return true;
1083         }
1084         return false;
1085 }
1086
1087 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1088                        struct ttm_mem_reg *mem,
1089                        uint32_t *new_flags)
1090 {
1091         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1092                                  mem, new_flags))
1093                 return true;
1094
1095         if ((placement->busy_placement != placement->placement ||
1096              placement->num_busy_placement > placement->num_placement) &&
1097             ttm_bo_places_compat(placement->busy_placement,
1098                                  placement->num_busy_placement,
1099                                  mem, new_flags))
1100                 return true;
1101
1102         return false;
1103 }
1104 EXPORT_SYMBOL(ttm_bo_mem_compat);
1105
1106 int ttm_bo_validate(struct ttm_buffer_object *bo,
1107                     struct ttm_placement *placement,
1108                     struct ttm_operation_ctx *ctx)
1109 {
1110         int ret;
1111         uint32_t new_flags;
1112
1113         reservation_object_assert_held(bo->resv);
1114         /*
1115          * Check whether we need to move buffer.
1116          */
1117         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1118                 ret = ttm_bo_move_buffer(bo, placement, ctx);
1119                 if (ret)
1120                         return ret;
1121         } else {
1122                 /*
1123                  * Use the access and other non-mapping-related flag bits from
1124                  * the compatible memory placement flags to the active flags
1125                  */
1126                 ttm_flag_masked(&bo->mem.placement, new_flags,
1127                                 ~TTM_PL_MASK_MEMTYPE);
1128         }
1129         /*
1130          * We might need to add a TTM.
1131          */
1132         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1133                 ret = ttm_bo_add_ttm(bo, true);
1134                 if (ret)
1135                         return ret;
1136         }
1137         return 0;
1138 }
1139 EXPORT_SYMBOL(ttm_bo_validate);
1140
1141 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1142                          struct ttm_buffer_object *bo,
1143                          unsigned long size,
1144                          enum ttm_bo_type type,
1145                          struct ttm_placement *placement,
1146                          uint32_t page_alignment,
1147                          struct ttm_operation_ctx *ctx,
1148                          struct file *persistent_swap_storage,
1149                          size_t acc_size,
1150                          struct sg_table *sg,
1151                          struct reservation_object *resv,
1152                          void (*destroy) (struct ttm_buffer_object *))
1153 {
1154         int ret = 0;
1155         unsigned long num_pages;
1156         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1157         bool locked;
1158
1159         ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1160         if (ret) {
1161                 pr_err("Out of kernel memory\n");
1162                 if (destroy)
1163                         (*destroy)(bo);
1164                 else
1165                         kfree(bo);
1166                 return -ENOMEM;
1167         }
1168
1169         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1170         if (num_pages == 0) {
1171                 pr_err("Illegal buffer object size\n");
1172                 if (destroy)
1173                         (*destroy)(bo);
1174                 else
1175                         kfree(bo);
1176                 ttm_mem_global_free(mem_glob, acc_size);
1177                 return -EINVAL;
1178         }
1179         bo->destroy = destroy;
1180
1181         kref_init(&bo->kref);
1182         kref_init(&bo->list_kref);
1183         atomic_set(&bo->cpu_writers, 0);
1184         INIT_LIST_HEAD(&bo->lru);
1185         INIT_LIST_HEAD(&bo->ddestroy);
1186         INIT_LIST_HEAD(&bo->swap);
1187         INIT_LIST_HEAD(&bo->io_reserve_lru);
1188         mutex_init(&bo->wu_mutex);
1189         bo->bdev = bdev;
1190         bo->glob = bdev->glob;
1191         bo->type = type;
1192         bo->num_pages = num_pages;
1193         bo->mem.size = num_pages << PAGE_SHIFT;
1194         bo->mem.mem_type = TTM_PL_SYSTEM;
1195         bo->mem.num_pages = bo->num_pages;
1196         bo->mem.mm_node = NULL;
1197         bo->mem.page_alignment = page_alignment;
1198         bo->mem.bus.io_reserved_vm = false;
1199         bo->mem.bus.io_reserved_count = 0;
1200         bo->moving = NULL;
1201         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1202         bo->persistent_swap_storage = persistent_swap_storage;
1203         bo->acc_size = acc_size;
1204         bo->sg = sg;
1205         if (resv) {
1206                 bo->resv = resv;
1207                 reservation_object_assert_held(bo->resv);
1208         } else {
1209                 bo->resv = &bo->ttm_resv;
1210         }
1211         reservation_object_init(&bo->ttm_resv);
1212         atomic_inc(&bo->glob->bo_count);
1213         drm_vma_node_reset(&bo->vma_node);
1214         bo->priority = 0;
1215
1216         /*
1217          * For ttm_bo_type_device buffers, allocate
1218          * address space from the device.
1219          */
1220         if (bo->type == ttm_bo_type_device ||
1221             bo->type == ttm_bo_type_sg)
1222                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->vma_node,
1223                                          bo->mem.num_pages);
1224
1225         /* passed reservation objects should already be locked,
1226          * since otherwise lockdep will be angered in radeon.
1227          */
1228         if (!resv) {
1229                 locked = reservation_object_trylock(bo->resv);
1230                 WARN_ON(!locked);
1231         }
1232
1233         if (likely(!ret))
1234                 ret = ttm_bo_validate(bo, placement, ctx);
1235
1236         if (unlikely(ret)) {
1237                 if (!resv)
1238                         ttm_bo_unreserve(bo);
1239
1240                 ttm_bo_unref(&bo);
1241                 return ret;
1242         }
1243
1244         if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1245                 spin_lock(&bo->glob->lru_lock);
1246                 ttm_bo_add_to_lru(bo);
1247                 spin_unlock(&bo->glob->lru_lock);
1248         }
1249
1250         return ret;
1251 }
1252 EXPORT_SYMBOL(ttm_bo_init_reserved);
1253
1254 int ttm_bo_init(struct ttm_bo_device *bdev,
1255                 struct ttm_buffer_object *bo,
1256                 unsigned long size,
1257                 enum ttm_bo_type type,
1258                 struct ttm_placement *placement,
1259                 uint32_t page_alignment,
1260                 bool interruptible,
1261                 struct file *persistent_swap_storage,
1262                 size_t acc_size,
1263                 struct sg_table *sg,
1264                 struct reservation_object *resv,
1265                 void (*destroy) (struct ttm_buffer_object *))
1266 {
1267         struct ttm_operation_ctx ctx = { interruptible, false };
1268         int ret;
1269
1270         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1271                                    page_alignment, &ctx,
1272                                    persistent_swap_storage, acc_size,
1273                                    sg, resv, destroy);
1274         if (ret)
1275                 return ret;
1276
1277         if (!resv)
1278                 ttm_bo_unreserve(bo);
1279
1280         return 0;
1281 }
1282 EXPORT_SYMBOL(ttm_bo_init);
1283
1284 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1285                        unsigned long bo_size,
1286                        unsigned struct_size)
1287 {
1288         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1289         size_t size = 0;
1290
1291         size += ttm_round_pot(struct_size);
1292         size += ttm_round_pot(npages * sizeof(void *));
1293         size += ttm_round_pot(sizeof(struct ttm_tt));
1294         return size;
1295 }
1296 EXPORT_SYMBOL(ttm_bo_acc_size);
1297
1298 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1299                            unsigned long bo_size,
1300                            unsigned struct_size)
1301 {
1302         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1303         size_t size = 0;
1304
1305         size += ttm_round_pot(struct_size);
1306         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1307         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1308         return size;
1309 }
1310 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1311
1312 int ttm_bo_create(struct ttm_bo_device *bdev,
1313                         unsigned long size,
1314                         enum ttm_bo_type type,
1315                         struct ttm_placement *placement,
1316                         uint32_t page_alignment,
1317                         bool interruptible,
1318                         struct file *persistent_swap_storage,
1319                         struct ttm_buffer_object **p_bo)
1320 {
1321         struct ttm_buffer_object *bo;
1322         size_t acc_size;
1323         int ret;
1324
1325         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1326         if (unlikely(bo == NULL))
1327                 return -ENOMEM;
1328
1329         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1330         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1331                           interruptible, persistent_swap_storage, acc_size,
1332                           NULL, NULL, NULL);
1333         if (likely(ret == 0))
1334                 *p_bo = bo;
1335
1336         return ret;
1337 }
1338 EXPORT_SYMBOL(ttm_bo_create);
1339
1340 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1341                                    unsigned mem_type)
1342 {
1343         struct ttm_operation_ctx ctx = { false, false };
1344         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1345         struct ttm_bo_global *glob = bdev->glob;
1346         struct dma_fence *fence;
1347         int ret;
1348         unsigned i;
1349
1350         /*
1351          * Can't use standard list traversal since we're unlocking.
1352          */
1353
1354         spin_lock(&glob->lru_lock);
1355         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1356                 while (!list_empty(&man->lru[i])) {
1357                         spin_unlock(&glob->lru_lock);
1358                         ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx);
1359                         if (ret)
1360                                 return ret;
1361                         spin_lock(&glob->lru_lock);
1362                 }
1363         }
1364         spin_unlock(&glob->lru_lock);
1365
1366         spin_lock(&man->move_lock);
1367         fence = dma_fence_get(man->move);
1368         spin_unlock(&man->move_lock);
1369
1370         if (fence) {
1371                 ret = dma_fence_wait(fence, false);
1372                 dma_fence_put(fence);
1373                 if (ret)
1374                         return ret;
1375         }
1376
1377         return 0;
1378 }
1379
1380 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1381 {
1382         struct ttm_mem_type_manager *man;
1383         int ret = -EINVAL;
1384
1385         if (mem_type >= TTM_NUM_MEM_TYPES) {
1386                 pr_err("Illegal memory type %d\n", mem_type);
1387                 return ret;
1388         }
1389         man = &bdev->man[mem_type];
1390
1391         if (!man->has_type) {
1392                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1393                        mem_type);
1394                 return ret;
1395         }
1396
1397         man->use_type = false;
1398         man->has_type = false;
1399
1400         ret = 0;
1401         if (mem_type > 0) {
1402                 ret = ttm_bo_force_list_clean(bdev, mem_type);
1403                 if (ret) {
1404                         pr_err("Cleanup eviction failed\n");
1405                         return ret;
1406                 }
1407
1408                 ret = (*man->func->takedown)(man);
1409         }
1410
1411         dma_fence_put(man->move);
1412         man->move = NULL;
1413
1414         return ret;
1415 }
1416 EXPORT_SYMBOL(ttm_bo_clean_mm);
1417
1418 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1419 {
1420         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1421
1422         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1423                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1424                 return -EINVAL;
1425         }
1426
1427         if (!man->has_type) {
1428                 pr_err("Memory type %u has not been initialized\n", mem_type);
1429                 return 0;
1430         }
1431
1432         return ttm_bo_force_list_clean(bdev, mem_type);
1433 }
1434 EXPORT_SYMBOL(ttm_bo_evict_mm);
1435
1436 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1437                         unsigned long p_size)
1438 {
1439         int ret;
1440         struct ttm_mem_type_manager *man;
1441         unsigned i;
1442
1443         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1444         man = &bdev->man[type];
1445         BUG_ON(man->has_type);
1446         man->io_reserve_fastpath = true;
1447         man->use_io_reserve_lru = false;
1448         mutex_init(&man->io_reserve_mutex);
1449         spin_lock_init(&man->move_lock);
1450         INIT_LIST_HEAD(&man->io_reserve_lru);
1451
1452         ret = bdev->driver->init_mem_type(bdev, type, man);
1453         if (ret)
1454                 return ret;
1455         man->bdev = bdev;
1456
1457         if (type != TTM_PL_SYSTEM) {
1458                 ret = (*man->func->init)(man, p_size);
1459                 if (ret)
1460                         return ret;
1461         }
1462         man->has_type = true;
1463         man->use_type = true;
1464         man->size = p_size;
1465
1466         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1467                 INIT_LIST_HEAD(&man->lru[i]);
1468         man->move = NULL;
1469
1470         return 0;
1471 }
1472 EXPORT_SYMBOL(ttm_bo_init_mm);
1473
1474 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1475 {
1476         struct ttm_bo_global *glob =
1477                 container_of(kobj, struct ttm_bo_global, kobj);
1478
1479         __free_page(glob->dummy_read_page);
1480         kfree(glob);
1481 }
1482
1483 void ttm_bo_global_release(struct drm_global_reference *ref)
1484 {
1485         struct ttm_bo_global *glob = ref->object;
1486
1487         kobject_del(&glob->kobj);
1488         kobject_put(&glob->kobj);
1489 }
1490 EXPORT_SYMBOL(ttm_bo_global_release);
1491
1492 int ttm_bo_global_init(struct drm_global_reference *ref)
1493 {
1494         struct ttm_bo_global_ref *bo_ref =
1495                 container_of(ref, struct ttm_bo_global_ref, ref);
1496         struct ttm_bo_global *glob = ref->object;
1497         int ret;
1498         unsigned i;
1499
1500         mutex_init(&glob->device_list_mutex);
1501         spin_lock_init(&glob->lru_lock);
1502         glob->mem_glob = bo_ref->mem_glob;
1503         glob->mem_glob->bo_glob = glob;
1504         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1505
1506         if (unlikely(glob->dummy_read_page == NULL)) {
1507                 ret = -ENOMEM;
1508                 goto out_no_drp;
1509         }
1510
1511         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1512                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1513         INIT_LIST_HEAD(&glob->device_list);
1514         atomic_set(&glob->bo_count, 0);
1515
1516         ret = kobject_init_and_add(
1517                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1518         if (unlikely(ret != 0))
1519                 kobject_put(&glob->kobj);
1520         return ret;
1521 out_no_drp:
1522         kfree(glob);
1523         return ret;
1524 }
1525 EXPORT_SYMBOL(ttm_bo_global_init);
1526
1527
1528 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1529 {
1530         int ret = 0;
1531         unsigned i = TTM_NUM_MEM_TYPES;
1532         struct ttm_mem_type_manager *man;
1533         struct ttm_bo_global *glob = bdev->glob;
1534
1535         while (i--) {
1536                 man = &bdev->man[i];
1537                 if (man->has_type) {
1538                         man->use_type = false;
1539                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1540                                 ret = -EBUSY;
1541                                 pr_err("DRM memory manager type %d is not clean\n",
1542                                        i);
1543                         }
1544                         man->has_type = false;
1545                 }
1546         }
1547
1548         mutex_lock(&glob->device_list_mutex);
1549         list_del(&bdev->device_list);
1550         mutex_unlock(&glob->device_list_mutex);
1551
1552         cancel_delayed_work_sync(&bdev->wq);
1553
1554         if (ttm_bo_delayed_delete(bdev, true))
1555                 pr_debug("Delayed destroy list was clean\n");
1556
1557         spin_lock(&glob->lru_lock);
1558         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1559                 if (list_empty(&bdev->man[0].lru[0]))
1560                         pr_debug("Swap list %d was clean\n", i);
1561         spin_unlock(&glob->lru_lock);
1562
1563         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1564
1565         return ret;
1566 }
1567 EXPORT_SYMBOL(ttm_bo_device_release);
1568
1569 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1570                        struct ttm_bo_global *glob,
1571                        struct ttm_bo_driver *driver,
1572                        struct address_space *mapping,
1573                        uint64_t file_page_offset,
1574                        bool need_dma32)
1575 {
1576         int ret = -EINVAL;
1577
1578         bdev->driver = driver;
1579
1580         memset(bdev->man, 0, sizeof(bdev->man));
1581
1582         /*
1583          * Initialize the system memory buffer type.
1584          * Other types need to be driver / IOCTL initialized.
1585          */
1586         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1587         if (unlikely(ret != 0))
1588                 goto out_no_sys;
1589
1590         drm_vma_offset_manager_init(&bdev->vma_manager, file_page_offset,
1591                                     0x10000000);
1592         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1593         INIT_LIST_HEAD(&bdev->ddestroy);
1594         bdev->dev_mapping = mapping;
1595         bdev->glob = glob;
1596         bdev->need_dma32 = need_dma32;
1597         mutex_lock(&glob->device_list_mutex);
1598         list_add_tail(&bdev->device_list, &glob->device_list);
1599         mutex_unlock(&glob->device_list_mutex);
1600
1601         return 0;
1602 out_no_sys:
1603         return ret;
1604 }
1605 EXPORT_SYMBOL(ttm_bo_device_init);
1606
1607 /*
1608  * buffer object vm functions.
1609  */
1610
1611 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1612 {
1613         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1614
1615         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1616                 if (mem->mem_type == TTM_PL_SYSTEM)
1617                         return false;
1618
1619                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1620                         return false;
1621
1622                 if (mem->placement & TTM_PL_FLAG_CACHED)
1623                         return false;
1624         }
1625         return true;
1626 }
1627
1628 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1629 {
1630         struct ttm_bo_device *bdev = bo->bdev;
1631
1632         drm_vma_node_unmap(&bo->vma_node, bdev->dev_mapping);
1633         ttm_mem_io_free_vm(bo);
1634 }
1635
1636 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1637 {
1638         struct ttm_bo_device *bdev = bo->bdev;
1639         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1640
1641         ttm_mem_io_lock(man, false);
1642         ttm_bo_unmap_virtual_locked(bo);
1643         ttm_mem_io_unlock(man);
1644 }
1645
1646
1647 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1648
1649 int ttm_bo_wait(struct ttm_buffer_object *bo,
1650                 bool interruptible, bool no_wait)
1651 {
1652         long timeout = 15 * HZ;
1653
1654         if (no_wait) {
1655                 if (reservation_object_test_signaled_rcu(bo->resv, true))
1656                         return 0;
1657                 else
1658                         return -EBUSY;
1659         }
1660
1661         timeout = reservation_object_wait_timeout_rcu(bo->resv, true,
1662                                                       interruptible, timeout);
1663         if (timeout < 0)
1664                 return timeout;
1665
1666         if (timeout == 0)
1667                 return -EBUSY;
1668
1669         reservation_object_add_excl_fence(bo->resv, NULL);
1670         return 0;
1671 }
1672 EXPORT_SYMBOL(ttm_bo_wait);
1673
1674 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1675 {
1676         int ret = 0;
1677
1678         /*
1679          * Using ttm_bo_reserve makes sure the lru lists are updated.
1680          */
1681
1682         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1683         if (unlikely(ret != 0))
1684                 return ret;
1685         ret = ttm_bo_wait(bo, true, no_wait);
1686         if (likely(ret == 0))
1687                 atomic_inc(&bo->cpu_writers);
1688         ttm_bo_unreserve(bo);
1689         return ret;
1690 }
1691 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1692
1693 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1694 {
1695         atomic_dec(&bo->cpu_writers);
1696 }
1697 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1698
1699 /**
1700  * A buffer object shrink method that tries to swap out the first
1701  * buffer object on the bo_global::swap_lru list.
1702  */
1703 int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1704 {
1705         struct ttm_buffer_object *bo;
1706         int ret = -EBUSY;
1707         bool locked;
1708         unsigned i;
1709
1710         spin_lock(&glob->lru_lock);
1711         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1712                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1713                         if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked)) {
1714                                 ret = 0;
1715                                 break;
1716                         }
1717                 }
1718                 if (!ret)
1719                         break;
1720         }
1721
1722         if (ret) {
1723                 spin_unlock(&glob->lru_lock);
1724                 return ret;
1725         }
1726
1727         kref_get(&bo->list_kref);
1728
1729         if (!list_empty(&bo->ddestroy)) {
1730                 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1731                 kref_put(&bo->list_kref, ttm_bo_release_list);
1732                 return ret;
1733         }
1734
1735         ttm_bo_del_from_lru(bo);
1736         spin_unlock(&glob->lru_lock);
1737
1738         /**
1739          * Move to system cached
1740          */
1741
1742         if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1743             bo->ttm->caching_state != tt_cached) {
1744                 struct ttm_operation_ctx ctx = { false, false };
1745                 struct ttm_mem_reg evict_mem;
1746
1747                 evict_mem = bo->mem;
1748                 evict_mem.mm_node = NULL;
1749                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1750                 evict_mem.mem_type = TTM_PL_SYSTEM;
1751
1752                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1753                 if (unlikely(ret != 0))
1754                         goto out;
1755         }
1756
1757         /**
1758          * Make sure BO is idle.
1759          */
1760
1761         ret = ttm_bo_wait(bo, false, false);
1762         if (unlikely(ret != 0))
1763                 goto out;
1764
1765         ttm_bo_unmap_virtual(bo);
1766
1767         /**
1768          * Swap out. Buffer will be swapped in again as soon as
1769          * anyone tries to access a ttm page.
1770          */
1771
1772         if (bo->bdev->driver->swap_notify)
1773                 bo->bdev->driver->swap_notify(bo);
1774
1775         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1776 out:
1777
1778         /**
1779          *
1780          * Unreserve without putting on LRU to avoid swapping out an
1781          * already swapped buffer.
1782          */
1783         if (locked)
1784                 reservation_object_unlock(bo->resv);
1785         kref_put(&bo->list_kref, ttm_bo_release_list);
1786         return ret;
1787 }
1788 EXPORT_SYMBOL(ttm_bo_swapout);
1789
1790 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1791 {
1792         struct ttm_operation_ctx ctx = {
1793                 .interruptible = false,
1794                 .no_wait_gpu = false
1795         };
1796
1797         while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1798                 ;
1799 }
1800 EXPORT_SYMBOL(ttm_bo_swapout_all);
1801
1802 /**
1803  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1804  * unreserved
1805  *
1806  * @bo: Pointer to buffer
1807  */
1808 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1809 {
1810         int ret;
1811
1812         /*
1813          * In the absense of a wait_unlocked API,
1814          * Use the bo::wu_mutex to avoid triggering livelocks due to
1815          * concurrent use of this function. Note that this use of
1816          * bo::wu_mutex can go away if we change locking order to
1817          * mmap_sem -> bo::reserve.
1818          */
1819         ret = mutex_lock_interruptible(&bo->wu_mutex);
1820         if (unlikely(ret != 0))
1821                 return -ERESTARTSYS;
1822         if (!ww_mutex_is_locked(&bo->resv->lock))
1823                 goto out_unlock;
1824         ret = reservation_object_lock_interruptible(bo->resv, NULL);
1825         if (ret == -EINTR)
1826                 ret = -ERESTARTSYS;
1827         if (unlikely(ret != 0))
1828                 goto out_unlock;
1829         reservation_object_unlock(bo->resv);
1830
1831 out_unlock:
1832         mutex_unlock(&bo->wu_mutex);
1833         return ret;
1834 }