drivers/gpu/drm/ttm/ttm

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This source file includes following definitions.
ttm_bo_default_destroy
ttm_mem_type_from_place
ttm_mem_type_debug
ttm_bo_mem_space_debug
ttm_bo_global_show
ttm_bo_type_flags
ttm_bo_release_list
ttm_bo_add_mem_to_lru
ttm_bo_add_to_lru
ttm_bo_ref_bug
ttm_bo_del_from_lru
ttm_bo_del_sub_from_lru
ttm_bo_bulk_move_set_pos
ttm_bo_move_to_lru_tail
ttm_bo_bulk_move_lru_tail
ttm_bo_handle_move_mem
ttm_bo_cleanup_memtype_use
ttm_bo_individualize_resv
ttm_bo_flush_all_fences
ttm_bo_cleanup_refs_or_queue
ttm_bo_cleanup_refs
ttm_bo_delayed_delete
ttm_bo_delayed_workqueue
ttm_bo_release
ttm_bo_put
ttm_bo_lock_delayed_workqueue
ttm_bo_unlock_delayed_workqueue
ttm_bo_evict
ttm_bo_eviction_valuable
ttm_bo_evict_swapout_allowable
ttm_mem_evict_wait_busy
ttm_mem_evict_first
ttm_bo_mem_put
ttm_bo_add_move_fence
ttm_bo_mem_force_space
ttm_bo_select_caching
ttm_bo_mt_compatible
ttm_bo_mem_placement
ttm_bo_mem_space
ttm_bo_move_buffer
ttm_bo_places_compat
ttm_bo_mem_compat
ttm_bo_validate
ttm_bo_init_reserved
ttm_bo_init
ttm_bo_acc_size
ttm_bo_dma_acc_size
ttm_bo_create
ttm_bo_force_list_clean
ttm_bo_clean_mm
ttm_bo_evict_mm
ttm_bo_init_mm
ttm_bo_global_kobj_release
ttm_bo_global_release
ttm_bo_global_init
ttm_bo_device_release
ttm_bo_device_init
ttm_mem_reg_is_pci
ttm_bo_unmap_virtual_locked
ttm_bo_unmap_virtual
ttm_bo_wait
ttm_bo_synccpu_write_grab
ttm_bo_synccpu_write_release
ttm_bo_swapout
ttm_bo_swapout_all
ttm_bo_wait_unreserved
   1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2 /**************************************************************************
   3  *
   4  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  25  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28 /*
  29  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  30  */
  31 
  32 #define pr_fmt(fmt) "[TTM] " fmt
  33 
  34 #include <drm/ttm/ttm_module.h>
  35 #include <drm/ttm/ttm_bo_driver.h>
  36 #include <drm/ttm/ttm_placement.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/slab.h>
  39 #include <linux/sched.h>
  40 #include <linux/mm.h>
  41 #include <linux/file.h>
  42 #include <linux/module.h>
  43 #include <linux/atomic.h>
  44 #include <linux/dma-resv.h>
  45 
  46 static void ttm_bo_global_kobj_release(struct kobject *kobj);
  47 
  48 /**
  49  * ttm_global_mutex - protecting the global BO state
  50  */
  51 DEFINE_MUTEX(ttm_global_mutex);
  52 unsigned ttm_bo_glob_use_count;
  53 struct ttm_bo_global ttm_bo_glob;
  54 
  55 static struct attribute ttm_bo_count = {
  56         .name = "bo_count",
  57         .mode = S_IRUGO
  58 };
  59 
  60 /* default destructor */
  61 static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
  62 {
  63         kfree(bo);
  64 }
  65 
  66 static inline int ttm_mem_type_from_place(const struct ttm_place *place,
  67                                           uint32_t *mem_type)
  68 {
  69         int pos;
  70 
  71         pos = ffs(place->flags & TTM_PL_MASK_MEM);
  72         if (unlikely(!pos))
  73                 return -EINVAL;
  74 
  75         *mem_type = pos - 1;
  76         return 0;
  77 }
  78 
  79 static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p,
  80                                int mem_type)
  81 {
  82         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
  83 
  84         drm_printf(p, "    has_type: %d\n", man->has_type);
  85         drm_printf(p, "    use_type: %d\n", man->use_type);
  86         drm_printf(p, "    flags: 0x%08X\n", man->flags);
  87         drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
  88         drm_printf(p, "    size: %llu\n", man->size);
  89         drm_printf(p, "    available_caching: 0x%08X\n", man->available_caching);
  90         drm_printf(p, "    default_caching: 0x%08X\n", man->default_caching);
  91         if (mem_type != TTM_PL_SYSTEM)
  92                 (*man->func->debug)(man, p);
  93 }
  94 
  95 static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,
  96                                         struct ttm_placement *placement)
  97 {
  98         struct drm_printer p = drm_debug_printer(TTM_PFX);
  99         int i, ret, mem_type;
 100 
 101         drm_printf(&p, "No space for %p (%lu pages, %luK, %luM)\n",
 102                    bo, bo->mem.num_pages, bo->mem.size >> 10,
 103                    bo->mem.size >> 20);
 104         for (i = 0; i < placement->num_placement; i++) {
 105                 ret = ttm_mem_type_from_place(&placement->placement[i],
 106                                                 &mem_type);
 107                 if (ret)
 108                         return;
 109                 drm_printf(&p, "  placement[%d]=0x%08X (%d)\n",
 110                            i, placement->placement[i].flags, mem_type);
 111                 ttm_mem_type_debug(bo->bdev, &p, mem_type);
 112         }
 113 }
 114 
 115 static ssize_t ttm_bo_global_show(struct kobject *kobj,
 116                                   struct attribute *attr,
 117                                   char *buffer)
 118 {
 119         struct ttm_bo_global *glob =
 120                 container_of(kobj, struct ttm_bo_global, kobj);
 121 
 122         return snprintf(buffer, PAGE_SIZE, "%d\n",
 123                                 atomic_read(&glob->bo_count));
 124 }
 125 
 126 static struct attribute *ttm_bo_global_attrs[] = {
 127         &ttm_bo_count,
 128         NULL
 129 };
 130 
 131 static const struct sysfs_ops ttm_bo_global_ops = {
 132         .show = &ttm_bo_global_show
 133 };
 134 
 135 static struct kobj_type ttm_bo_glob_kobj_type  = {
 136         .release = &ttm_bo_global_kobj_release,
 137         .sysfs_ops = &ttm_bo_global_ops,
 138         .default_attrs = ttm_bo_global_attrs
 139 };
 140 
 141 
 142 static inline uint32_t ttm_bo_type_flags(unsigned type)
 143 {
 144         return 1 << (type);
 145 }
 146 
 147 static void ttm_bo_release_list(struct kref *list_kref)
 148 {
 149         struct ttm_buffer_object *bo =
 150             container_of(list_kref, struct ttm_buffer_object, list_kref);
 151         struct ttm_bo_device *bdev = bo->bdev;
 152         size_t acc_size = bo->acc_size;
 153 
 154         BUG_ON(kref_read(&bo->list_kref));
 155         BUG_ON(kref_read(&bo->kref));
 156         BUG_ON(atomic_read(&bo->cpu_writers));
 157         BUG_ON(bo->mem.mm_node != NULL);
 158         BUG_ON(!list_empty(&bo->lru));
 159         BUG_ON(!list_empty(&bo->ddestroy));
 160         ttm_tt_destroy(bo->ttm);
 161         atomic_dec(&bo->bdev->glob->bo_count);
 162         dma_fence_put(bo->moving);
 163         if (!ttm_bo_uses_embedded_gem_object(bo))
 164                 dma_resv_fini(&bo->base._resv);
 165         mutex_destroy(&bo->wu_mutex);
 166         bo->destroy(bo);
 167         ttm_mem_global_free(bdev->glob->mem_glob, acc_size);
 168 }
 169 
 170 static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
 171                                   struct ttm_mem_reg *mem)
 172 {
 173         struct ttm_bo_device *bdev = bo->bdev;
 174         struct ttm_mem_type_manager *man;
 175 
 176         dma_resv_assert_held(bo->base.resv);
 177 
 178         if (!list_empty(&bo->lru))
 179                 return;
 180 
 181         if (mem->placement & TTM_PL_FLAG_NO_EVICT)
 182                 return;
 183 
 184         man = &bdev->man[mem->mem_type];
 185         list_add_tail(&bo->lru, &man->lru[bo->priority]);
 186         kref_get(&bo->list_kref);
 187 
 188         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm &&
 189             !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
 190                                      TTM_PAGE_FLAG_SWAPPED))) {
 191                 list_add_tail(&bo->swap, &bdev->glob->swap_lru[bo->priority]);
 192                 kref_get(&bo->list_kref);
 193         }
 194 }
 195 
 196 void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 197 {
 198         ttm_bo_add_mem_to_lru(bo, &bo->mem);
 199 }
 200 EXPORT_SYMBOL(ttm_bo_add_to_lru);
 201 
 202 static void ttm_bo_ref_bug(struct kref *list_kref)
 203 {
 204         BUG();
 205 }
 206 
 207 void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 208 {
 209         struct ttm_bo_device *bdev = bo->bdev;
 210         bool notify = false;
 211 
 212         if (!list_empty(&bo->swap)) {
 213                 list_del_init(&bo->swap);
 214                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 215                 notify = true;
 216         }
 217         if (!list_empty(&bo->lru)) {
 218                 list_del_init(&bo->lru);
 219                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
 220                 notify = true;
 221         }
 222 
 223         if (notify && bdev->driver->del_from_lru_notify)
 224                 bdev->driver->del_from_lru_notify(bo);
 225 }
 226 
 227 void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 228 {
 229         struct ttm_bo_global *glob = bo->bdev->glob;
 230 
 231         spin_lock(&glob->lru_lock);
 232         ttm_bo_del_from_lru(bo);
 233         spin_unlock(&glob->lru_lock);
 234 }
 235 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 236 
 237 static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
 238                                      struct ttm_buffer_object *bo)
 239 {
 240         if (!pos->first)
 241                 pos->first = bo;
 242         pos->last = bo;
 243 }
 244 
 245 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 246                              struct ttm_lru_bulk_move *bulk)
 247 {
 248         dma_resv_assert_held(bo->base.resv);
 249 
 250         ttm_bo_del_from_lru(bo);
 251         ttm_bo_add_to_lru(bo);
 252 
 253         if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
 254                 switch (bo->mem.mem_type) {
 255                 case TTM_PL_TT:
 256                         ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
 257                         break;
 258 
 259                 case TTM_PL_VRAM:
 260                         ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
 261                         break;
 262                 }
 263                 if (bo->ttm && !(bo->ttm->page_flags &
 264                                  (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
 265                         ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
 266         }
 267 }
 268 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 269 
 270 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
 271 {
 272         unsigned i;
 273 
 274         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 275                 struct ttm_lru_bulk_move_pos *pos = &bulk->tt[i];
 276                 struct ttm_mem_type_manager *man;
 277 
 278                 if (!pos->first)
 279                         continue;
 280 
 281                 dma_resv_assert_held(pos->first->base.resv);
 282                 dma_resv_assert_held(pos->last->base.resv);
 283 
 284                 man = &pos->first->bdev->man[TTM_PL_TT];
 285                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 286                                     &pos->last->lru);
 287         }
 288 
 289         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 290                 struct ttm_lru_bulk_move_pos *pos = &bulk->vram[i];
 291                 struct ttm_mem_type_manager *man;
 292 
 293                 if (!pos->first)
 294                         continue;
 295 
 296                 dma_resv_assert_held(pos->first->base.resv);
 297                 dma_resv_assert_held(pos->last->base.resv);
 298 
 299                 man = &pos->first->bdev->man[TTM_PL_VRAM];
 300                 list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 301                                     &pos->last->lru);
 302         }
 303 
 304         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 305                 struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
 306                 struct list_head *lru;
 307 
 308                 if (!pos->first)
 309                         continue;
 310 
 311                 dma_resv_assert_held(pos->first->base.resv);
 312                 dma_resv_assert_held(pos->last->base.resv);
 313 
 314                 lru = &pos->first->bdev->glob->swap_lru[i];
 315                 list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
 316         }
 317 }
 318 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
 319 
 320 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 321                                   struct ttm_mem_reg *mem, bool evict,
 322                                   struct ttm_operation_ctx *ctx)
 323 {
 324         struct ttm_bo_device *bdev = bo->bdev;
 325         bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
 326         bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
 327         struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
 328         struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
 329         int ret = 0;
 330 
 331         if (old_is_pci || new_is_pci ||
 332             ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {
 333                 ret = ttm_mem_io_lock(old_man, true);
 334                 if (unlikely(ret != 0))
 335                         goto out_err;
 336                 ttm_bo_unmap_virtual_locked(bo);
 337                 ttm_mem_io_unlock(old_man);
 338         }
 339 
 340         /*
 341          * Create and bind a ttm if required.
 342          */
 343 
 344         if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
 345                 if (bo->ttm == NULL) {
 346                         bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
 347                         ret = ttm_tt_create(bo, zero);
 348                         if (ret)
 349                                 goto out_err;
 350                 }
 351 
 352                 ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
 353                 if (ret)
 354                         goto out_err;
 355 
 356                 if (mem->mem_type != TTM_PL_SYSTEM) {
 357                         ret = ttm_tt_bind(bo->ttm, mem, ctx);
 358                         if (ret)
 359                                 goto out_err;
 360                 }
 361 
 362                 if (bo->mem.mem_type == TTM_PL_SYSTEM) {
 363                         if (bdev->driver->move_notify)
 364                                 bdev->driver->move_notify(bo, evict, mem);
 365                         bo->mem = *mem;
 366                         mem->mm_node = NULL;
 367                         goto moved;
 368                 }
 369         }
 370 
 371         if (bdev->driver->move_notify)
 372                 bdev->driver->move_notify(bo, evict, mem);
 373 
 374         if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
 375             !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
 376                 ret = ttm_bo_move_ttm(bo, ctx, mem);
 377         else if (bdev->driver->move)
 378                 ret = bdev->driver->move(bo, evict, ctx, mem);
 379         else
 380                 ret = ttm_bo_move_memcpy(bo, ctx, mem);
 381 
 382         if (ret) {
 383                 if (bdev->driver->move_notify) {
 384                         swap(*mem, bo->mem);
 385                         bdev->driver->move_notify(bo, false, mem);
 386                         swap(*mem, bo->mem);
 387                 }
 388 
 389                 goto out_err;
 390         }
 391 
 392 moved:
 393         if (bo->evicted) {
 394                 if (bdev->driver->invalidate_caches) {
 395                         ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
 396                         if (ret)
 397                                 pr_err("Can not flush read caches\n");
 398                 }
 399                 bo->evicted = false;
 400         }
 401 
 402         if (bo->mem.mm_node)
 403                 bo->offset = (bo->mem.start << PAGE_SHIFT) +
 404                     bdev->man[bo->mem.mem_type].gpu_offset;
 405         else
 406                 bo->offset = 0;
 407 
 408         ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
 409         return 0;
 410 
 411 out_err:
 412         new_man = &bdev->man[bo->mem.mem_type];
 413         if (new_man->flags & TTM_MEMTYPE_FLAG_FIXED) {
 414                 ttm_tt_destroy(bo->ttm);
 415                 bo->ttm = NULL;
 416         }
 417 
 418         return ret;
 419 }
 420 
 421 /**
 422  * Call bo::reserved.
 423  * Will release GPU memory type usage on destruction.
 424  * This is the place to put in driver specific hooks to release
 425  * driver private resources.
 426  * Will release the bo::reserved lock.
 427  */
 428 
 429 static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
 430 {
 431         if (bo->bdev->driver->move_notify)
 432                 bo->bdev->driver->move_notify(bo, false, NULL);
 433 
 434         ttm_tt_destroy(bo->ttm);
 435         bo->ttm = NULL;
 436         ttm_bo_mem_put(bo, &bo->mem);
 437 }
 438 
 439 static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
 440 {
 441         int r;
 442 
 443         if (bo->base.resv == &bo->base._resv)
 444                 return 0;
 445 
 446         BUG_ON(!dma_resv_trylock(&bo->base._resv));
 447 
 448         r = dma_resv_copy_fences(&bo->base._resv, bo->base.resv);
 449         if (r)
 450                 dma_resv_unlock(&bo->base._resv);
 451 
 452         return r;
 453 }
 454 
 455 static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
 456 {
 457         struct dma_resv_list *fobj;
 458         struct dma_fence *fence;
 459         int i;
 460 
 461         fobj = dma_resv_get_list(&bo->base._resv);
 462         fence = dma_resv_get_excl(&bo->base._resv);
 463         if (fence && !fence->ops->signaled)
 464                 dma_fence_enable_sw_signaling(fence);
 465 
 466         for (i = 0; fobj && i < fobj->shared_count; ++i) {
 467                 fence = rcu_dereference_protected(fobj->shared[i],
 468                                         dma_resv_held(bo->base.resv));
 469 
 470                 if (!fence->ops->signaled)
 471                         dma_fence_enable_sw_signaling(fence);
 472         }
 473 }
 474 
 475 static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
 476 {
 477         struct ttm_bo_device *bdev = bo->bdev;
 478         struct ttm_bo_global *glob = bdev->glob;
 479         int ret;
 480 
 481         ret = ttm_bo_individualize_resv(bo);
 482         if (ret) {
 483                 /* Last resort, if we fail to allocate memory for the
 484                  * fences block for the BO to become idle
 485                  */
 486                 dma_resv_wait_timeout_rcu(bo->base.resv, true, false,
 487                                                     30 * HZ);
 488                 spin_lock(&glob->lru_lock);
 489                 goto error;
 490         }
 491 
 492         spin_lock(&glob->lru_lock);
 493         ret = dma_resv_trylock(bo->base.resv) ? 0 : -EBUSY;
 494         if (!ret) {
 495                 if (dma_resv_test_signaled_rcu(&bo->base._resv, true)) {
 496                         ttm_bo_del_from_lru(bo);
 497                         spin_unlock(&glob->lru_lock);
 498                         if (bo->base.resv != &bo->base._resv)
 499                                 dma_resv_unlock(&bo->base._resv);
 500 
 501                         ttm_bo_cleanup_memtype_use(bo);
 502                         dma_resv_unlock(bo->base.resv);
 503                         return;
 504                 }
 505 
 506                 ttm_bo_flush_all_fences(bo);
 507 
 508                 /*
 509                  * Make NO_EVICT bos immediately available to
 510                  * shrinkers, now that they are queued for
 511                  * destruction.
 512                  */
 513                 if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 514                         bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
 515                         ttm_bo_add_to_lru(bo);
 516                 }
 517 
 518                 dma_resv_unlock(bo->base.resv);
 519         }
 520         if (bo->base.resv != &bo->base._resv) {
 521                 ttm_bo_flush_all_fences(bo);
 522                 dma_resv_unlock(&bo->base._resv);
 523         }
 524 
 525 error:
 526         kref_get(&bo->list_kref);
 527         list_add_tail(&bo->ddestroy, &bdev->ddestroy);
 528         spin_unlock(&glob->lru_lock);
 529 
 530         schedule_delayed_work(&bdev->wq,
 531                               ((HZ / 100) < 1) ? 1 : HZ / 100);
 532 }
 533 
 534 /**
 535  * function ttm_bo_cleanup_refs
 536  * If bo idle, remove from delayed- and lru lists, and unref.
 537  * If not idle, do nothing.
 538  *
 539  * Must be called with lru_lock and reservation held, this function
 540  * will drop the lru lock and optionally the reservation lock before returning.
 541  *
 542  * @interruptible         Any sleeps should occur interruptibly.
 543  * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.
 544  * @unlock_resv           Unlock the reservation lock as well.
 545  */
 546 
 547 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
 548                                bool interruptible, bool no_wait_gpu,
 549                                bool unlock_resv)
 550 {
 551         struct ttm_bo_global *glob = bo->bdev->glob;
 552         struct dma_resv *resv;
 553         int ret;
 554 
 555         if (unlikely(list_empty(&bo->ddestroy)))
 556                 resv = bo->base.resv;
 557         else
 558                 resv = &bo->base._resv;
 559 
 560         if (dma_resv_test_signaled_rcu(resv, true))
 561                 ret = 0;
 562         else
 563                 ret = -EBUSY;
 564 
 565         if (ret && !no_wait_gpu) {
 566                 long lret;
 567 
 568                 if (unlock_resv)
 569                         dma_resv_unlock(bo->base.resv);
 570                 spin_unlock(&glob->lru_lock);
 571 
 572                 lret = dma_resv_wait_timeout_rcu(resv, true,
 573                                                            interruptible,
 574                                                            30 * HZ);
 575 
 576                 if (lret < 0)
 577                         return lret;
 578                 else if (lret == 0)
 579                         return -EBUSY;
 580 
 581                 spin_lock(&glob->lru_lock);
 582                 if (unlock_resv && !dma_resv_trylock(bo->base.resv)) {
 583                         /*
 584                          * We raced, and lost, someone else holds the reservation now,
 585                          * and is probably busy in ttm_bo_cleanup_memtype_use.
 586                          *
 587                          * Even if it's not the case, because we finished waiting any
 588                          * delayed destruction would succeed, so just return success
 589                          * here.
 590                          */
 591                         spin_unlock(&glob->lru_lock);
 592                         return 0;
 593                 }
 594                 ret = 0;
 595         }
 596 
 597         if (ret || unlikely(list_empty(&bo->ddestroy))) {
 598                 if (unlock_resv)
 599                         dma_resv_unlock(bo->base.resv);
 600                 spin_unlock(&glob->lru_lock);
 601                 return ret;
 602         }
 603 
 604         ttm_bo_del_from_lru(bo);
 605         list_del_init(&bo->ddestroy);
 606         kref_put(&bo->list_kref, ttm_bo_ref_bug);
 607 
 608         spin_unlock(&glob->lru_lock);
 609         ttm_bo_cleanup_memtype_use(bo);
 610 
 611         if (unlock_resv)
 612                 dma_resv_unlock(bo->base.resv);
 613 
 614         return 0;
 615 }
 616 
 617 /**
 618  * Traverse the delayed list, and call ttm_bo_cleanup_refs on all
 619  * encountered buffers.
 620  */
 621 static bool ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 622 {
 623         struct ttm_bo_global *glob = bdev->glob;
 624         struct list_head removed;
 625         bool empty;
 626 
 627         INIT_LIST_HEAD(&removed);
 628 
 629         spin_lock(&glob->lru_lock);
 630         while (!list_empty(&bdev->ddestroy)) {
 631                 struct ttm_buffer_object *bo;
 632 
 633                 bo = list_first_entry(&bdev->ddestroy, struct ttm_buffer_object,
 634                                       ddestroy);
 635                 kref_get(&bo->list_kref);
 636                 list_move_tail(&bo->ddestroy, &removed);
 637 
 638                 if (remove_all || bo->base.resv != &bo->base._resv) {
 639                         spin_unlock(&glob->lru_lock);
 640                         dma_resv_lock(bo->base.resv, NULL);
 641 
 642                         spin_lock(&glob->lru_lock);
 643                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 644 
 645                 } else if (dma_resv_trylock(bo->base.resv)) {
 646                         ttm_bo_cleanup_refs(bo, false, !remove_all, true);
 647                 } else {
 648                         spin_unlock(&glob->lru_lock);
 649                 }
 650 
 651                 kref_put(&bo->list_kref, ttm_bo_release_list);
 652                 spin_lock(&glob->lru_lock);
 653         }
 654         list_splice_tail(&removed, &bdev->ddestroy);
 655         empty = list_empty(&bdev->ddestroy);
 656         spin_unlock(&glob->lru_lock);
 657 
 658         return empty;
 659 }
 660 
 661 static void ttm_bo_delayed_workqueue(struct work_struct *work)
 662 {
 663         struct ttm_bo_device *bdev =
 664             container_of(work, struct ttm_bo_device, wq.work);
 665 
 666         if (!ttm_bo_delayed_delete(bdev, false))
 667                 schedule_delayed_work(&bdev->wq,
 668                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 669 }
 670 
 671 static void ttm_bo_release(struct kref *kref)
 672 {
 673         struct ttm_buffer_object *bo =
 674             container_of(kref, struct ttm_buffer_object, kref);
 675         struct ttm_bo_device *bdev = bo->bdev;
 676         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
 677 
 678         if (bo->bdev->driver->release_notify)
 679                 bo->bdev->driver->release_notify(bo);
 680 
 681         drm_vma_offset_remove(&bdev->vma_manager, &bo->base.vma_node);
 682         ttm_mem_io_lock(man, false);
 683         ttm_mem_io_free_vm(bo);
 684         ttm_mem_io_unlock(man);
 685         ttm_bo_cleanup_refs_or_queue(bo);
 686         kref_put(&bo->list_kref, ttm_bo_release_list);
 687 }
 688 
 689 void ttm_bo_put(struct ttm_buffer_object *bo)
 690 {
 691         kref_put(&bo->kref, ttm_bo_release);
 692 }
 693 EXPORT_SYMBOL(ttm_bo_put);
 694 
 695 int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)
 696 {
 697         return cancel_delayed_work_sync(&bdev->wq);
 698 }
 699 EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);
 700 
 701 void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)
 702 {
 703         if (resched)
 704                 schedule_delayed_work(&bdev->wq,
 705                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 706 }
 707 EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
 708 
 709 static int ttm_bo_evict(struct ttm_buffer_object *bo,
 710                         struct ttm_operation_ctx *ctx)
 711 {
 712         struct ttm_bo_device *bdev = bo->bdev;
 713         struct ttm_mem_reg evict_mem;
 714         struct ttm_placement placement;
 715         int ret = 0;
 716 
 717         dma_resv_assert_held(bo->base.resv);
 718 
 719         placement.num_placement = 0;
 720         placement.num_busy_placement = 0;
 721         bdev->driver->evict_flags(bo, &placement);
 722 
 723         if (!placement.num_placement && !placement.num_busy_placement) {
 724                 ret = ttm_bo_pipeline_gutting(bo);
 725                 if (ret)
 726                         return ret;
 727 
 728                 return ttm_tt_create(bo, false);
 729         }
 730 
 731         evict_mem = bo->mem;
 732         evict_mem.mm_node = NULL;
 733         evict_mem.bus.io_reserved_vm = false;
 734         evict_mem.bus.io_reserved_count = 0;
 735 
 736         ret = ttm_bo_mem_space(bo, &placement, &evict_mem, ctx);
 737         if (ret) {
 738                 if (ret != -ERESTARTSYS) {
 739                         pr_err("Failed to find memory space for buffer 0x%p eviction\n",
 740                                bo);
 741                         ttm_bo_mem_space_debug(bo, &placement);
 742                 }
 743                 goto out;
 744         }
 745 
 746         ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, ctx);
 747         if (unlikely(ret)) {
 748                 if (ret != -ERESTARTSYS)
 749                         pr_err("Buffer eviction failed\n");
 750                 ttm_bo_mem_put(bo, &evict_mem);
 751                 goto out;
 752         }
 753         bo->evicted = true;
 754 out:
 755         return ret;
 756 }
 757 
 758 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 759                               const struct ttm_place *place)
 760 {
 761         /* Don't evict this BO if it's outside of the
 762          * requested placement range
 763          */
 764         if (place->fpfn >= (bo->mem.start + bo->mem.size) ||
 765             (place->lpfn && place->lpfn <= bo->mem.start))
 766                 return false;
 767 
 768         return true;
 769 }
 770 EXPORT_SYMBOL(ttm_bo_eviction_valuable);
 771 
 772 /**
 773  * Check the target bo is allowable to be evicted or swapout, including cases:
 774  *
 775  * a. if share same reservation object with ctx->resv, have assumption
 776  * reservation objects should already be locked, so not lock again and
 777  * return true directly when either the opreation allow_reserved_eviction
 778  * or the target bo already is in delayed free list;
 779  *
 780  * b. Otherwise, trylock it.
 781  */
 782 static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 783                         struct ttm_operation_ctx *ctx, bool *locked, bool *busy)
 784 {
 785         bool ret = false;
 786 
 787         if (bo->base.resv == ctx->resv) {
 788                 dma_resv_assert_held(bo->base.resv);
 789                 if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT
 790                     || !list_empty(&bo->ddestroy))
 791                         ret = true;
 792                 *locked = false;
 793                 if (busy)
 794                         *busy = false;
 795         } else {
 796                 ret = dma_resv_trylock(bo->base.resv);
 797                 *locked = ret;
 798                 if (busy)
 799                         *busy = !ret;
 800         }
 801 
 802         return ret;
 803 }
 804 
 805 /**
 806  * ttm_mem_evict_wait_busy - wait for a busy BO to become available
 807  *
 808  * @busy_bo: BO which couldn't be locked with trylock
 809  * @ctx: operation context
 810  * @ticket: acquire ticket
 811  *
 812  * Try to lock a busy buffer object to avoid failing eviction.
 813  */
 814 static int ttm_mem_evict_wait_busy(struct ttm_buffer_object *busy_bo,
 815                                    struct ttm_operation_ctx *ctx,
 816                                    struct ww_acquire_ctx *ticket)
 817 {
 818         int r;
 819 
 820         if (!busy_bo || !ticket)
 821                 return -EBUSY;
 822 
 823         if (ctx->interruptible)
 824                 r = dma_resv_lock_interruptible(busy_bo->base.resv,
 825                                                           ticket);
 826         else
 827                 r = dma_resv_lock(busy_bo->base.resv, ticket);
 828 
 829         /*
 830          * TODO: It would be better to keep the BO locked until allocation is at
 831          * least tried one more time, but that would mean a much larger rework
 832          * of TTM.
 833          */
 834         if (!r)
 835                 dma_resv_unlock(busy_bo->base.resv);
 836 
 837         return r == -EDEADLK ? -EBUSY : r;
 838 }
 839 
 840 static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 841                                uint32_t mem_type,
 842                                const struct ttm_place *place,
 843                                struct ttm_operation_ctx *ctx,
 844                                struct ww_acquire_ctx *ticket)
 845 {
 846         struct ttm_buffer_object *bo = NULL, *busy_bo = NULL;
 847         struct ttm_bo_global *glob = bdev->glob;
 848         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
 849         bool locked = false;
 850         unsigned i;
 851         int ret;
 852 
 853         spin_lock(&glob->lru_lock);
 854         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 855                 list_for_each_entry(bo, &man->lru[i], lru) {
 856                         bool busy;
 857 
 858                         if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
 859                                                             &busy)) {
 860                                 if (busy && !busy_bo && ticket !=
 861                                     dma_resv_locking_ctx(bo->base.resv))
 862                                         busy_bo = bo;
 863                                 continue;
 864                         }
 865 
 866                         if (place && !bdev->driver->eviction_valuable(bo,
 867                                                                       place)) {
 868                                 if (locked)
 869                                         dma_resv_unlock(bo->base.resv);
 870                                 continue;
 871                         }
 872                         break;
 873                 }
 874 
 875                 /* If the inner loop terminated early, we have our candidate */
 876                 if (&bo->lru != &man->lru[i])
 877                         break;
 878 
 879                 bo = NULL;
 880         }
 881 
 882         if (!bo) {
 883                 if (busy_bo)
 884                         kref_get(&busy_bo->list_kref);
 885                 spin_unlock(&glob->lru_lock);
 886                 ret = ttm_mem_evict_wait_busy(busy_bo, ctx, ticket);
 887                 if (busy_bo)
 888                         kref_put(&busy_bo->list_kref, ttm_bo_release_list);
 889                 return ret;
 890         }
 891 
 892         kref_get(&bo->list_kref);
 893 
 894         if (!list_empty(&bo->ddestroy)) {
 895                 ret = ttm_bo_cleanup_refs(bo, ctx->interruptible,
 896                                           ctx->no_wait_gpu, locked);
 897                 kref_put(&bo->list_kref, ttm_bo_release_list);
 898                 return ret;
 899         }
 900 
 901         ttm_bo_del_from_lru(bo);
 902         spin_unlock(&glob->lru_lock);
 903 
 904         ret = ttm_bo_evict(bo, ctx);
 905         if (locked) {
 906                 ttm_bo_unreserve(bo);
 907         } else {
 908                 spin_lock(&glob->lru_lock);
 909                 ttm_bo_add_to_lru(bo);
 910                 spin_unlock(&glob->lru_lock);
 911         }
 912 
 913         kref_put(&bo->list_kref, ttm_bo_release_list);
 914         return ret;
 915 }
 916 
 917 void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
 918 {
 919         struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];
 920 
 921         if (mem->mm_node)
 922                 (*man->func->put_node)(man, mem);
 923 }
 924 EXPORT_SYMBOL(ttm_bo_mem_put);
 925 
 926 /**
 927  * Add the last move fence to the BO and reserve a new shared slot.
 928  */
 929 static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
 930                                  struct ttm_mem_type_manager *man,
 931                                  struct ttm_mem_reg *mem,
 932                                  bool no_wait_gpu)
 933 {
 934         struct dma_fence *fence;
 935         int ret;
 936 
 937         spin_lock(&man->move_lock);
 938         fence = dma_fence_get(man->move);
 939         spin_unlock(&man->move_lock);
 940 
 941         if (!fence)
 942                 return 0;
 943 
 944         if (no_wait_gpu)
 945                 return -EBUSY;
 946 
 947         dma_resv_add_shared_fence(bo->base.resv, fence);
 948 
 949         ret = dma_resv_reserve_shared(bo->base.resv, 1);
 950         if (unlikely(ret)) {
 951                 dma_fence_put(fence);
 952                 return ret;
 953         }
 954 
 955         dma_fence_put(bo->moving);
 956         bo->moving = fence;
 957         return 0;
 958 }
 959 
 960 /**
 961  * Repeatedly evict memory from the LRU for @mem_type until we create enough
 962  * space, or we've evicted everything and there isn't enough space.
 963  */
 964 static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 965                                   const struct ttm_place *place,
 966                                   struct ttm_mem_reg *mem,
 967                                   struct ttm_operation_ctx *ctx)
 968 {
 969         struct ttm_bo_device *bdev = bo->bdev;
 970         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 971         struct ww_acquire_ctx *ticket;
 972         int ret;
 973 
 974         ticket = dma_resv_locking_ctx(bo->base.resv);
 975         do {
 976                 ret = (*man->func->get_node)(man, bo, place, mem);
 977                 if (unlikely(ret != 0))
 978                         return ret;
 979                 if (mem->mm_node)
 980                         break;
 981                 ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx,
 982                                           ticket);
 983                 if (unlikely(ret != 0))
 984                         return ret;
 985         } while (1);
 986 
 987         return ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
 988 }
 989 
 990 static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,
 991                                       uint32_t cur_placement,
 992                                       uint32_t proposed_placement)
 993 {
 994         uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;
 995         uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;
 996 
 997         /**
 998          * Keep current caching if possible.
 999          */
1000 
1001         if ((cur_placement & caching) != 0)
1002                 result |= (cur_placement & caching);
1003         else if ((man->default_caching & caching) != 0)
1004                 result |= man->default_caching;
1005         else if ((TTM_PL_FLAG_CACHED & caching) != 0)
1006                 result |= TTM_PL_FLAG_CACHED;
1007         else if ((TTM_PL_FLAG_WC & caching) != 0)
1008                 result |= TTM_PL_FLAG_WC;
1009         else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)
1010                 result |= TTM_PL_FLAG_UNCACHED;
1011 
1012         return result;
1013 }
1014 
1015 static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
1016                                  uint32_t mem_type,
1017                                  const struct ttm_place *place,
1018                                  uint32_t *masked_placement)
1019 {
1020         uint32_t cur_flags = ttm_bo_type_flags(mem_type);
1021 
1022         if ((cur_flags & place->flags & TTM_PL_MASK_MEM) == 0)
1023                 return false;
1024 
1025         if ((place->flags & man->available_caching) == 0)
1026                 return false;
1027 
1028         cur_flags |= (place->flags & man->available_caching);
1029 
1030         *masked_placement = cur_flags;
1031         return true;
1032 }
1033 
1034 /**
1035  * ttm_bo_mem_placement - check if placement is compatible
1036  * @bo: BO to find memory for
1037  * @place: where to search
1038  * @mem: the memory object to fill in
1039  * @ctx: operation context
1040  *
1041  * Check if placement is compatible and fill in mem structure.
1042  * Returns -EBUSY if placement won't work or negative error code.
1043  * 0 when placement can be used.
1044  */
1045 static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
1046                                 const struct ttm_place *place,
1047                                 struct ttm_mem_reg *mem,
1048                                 struct ttm_operation_ctx *ctx)
1049 {
1050         struct ttm_bo_device *bdev = bo->bdev;
1051         uint32_t mem_type = TTM_PL_SYSTEM;
1052         struct ttm_mem_type_manager *man;
1053         uint32_t cur_flags = 0;
1054         int ret;
1055 
1056         ret = ttm_mem_type_from_place(place, &mem_type);
1057         if (ret)
1058                 return ret;
1059 
1060         man = &bdev->man[mem_type];
1061         if (!man->has_type || !man->use_type)
1062                 return -EBUSY;
1063 
1064         if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
1065                 return -EBUSY;
1066 
1067         cur_flags = ttm_bo_select_caching(man, bo->mem.placement, cur_flags);
1068         /*
1069          * Use the access and other non-mapping-related flag bits from
1070          * the memory placement flags to the current flags
1071          */
1072         ttm_flag_masked(&cur_flags, place->flags, ~TTM_PL_MASK_MEMTYPE);
1073 
1074         mem->mem_type = mem_type;
1075         mem->placement = cur_flags;
1076 
1077         if (bo->mem.mem_type < mem_type && !list_empty(&bo->lru)) {
1078                 spin_lock(&bo->bdev->glob->lru_lock);
1079                 ttm_bo_del_from_lru(bo);
1080                 ttm_bo_add_mem_to_lru(bo, mem);
1081                 spin_unlock(&bo->bdev->glob->lru_lock);
1082         }
1083 
1084         return 0;
1085 }
1086 
1087 /**
1088  * Creates space for memory region @mem according to its type.
1089  *
1090  * This function first searches for free space in compatible memory types in
1091  * the priority order defined by the driver.  If free space isn't found, then
1092  * ttm_bo_mem_force_space is attempted in priority order to evict and find
1093  * space.
1094  */
1095 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
1096                         struct ttm_placement *placement,
1097                         struct ttm_mem_reg *mem,
1098                         struct ttm_operation_ctx *ctx)
1099 {
1100         struct ttm_bo_device *bdev = bo->bdev;
1101         bool type_found = false;
1102         int i, ret;
1103 
1104         ret = dma_resv_reserve_shared(bo->base.resv, 1);
1105         if (unlikely(ret))
1106                 return ret;
1107 
1108         mem->mm_node = NULL;
1109         for (i = 0; i < placement->num_placement; ++i) {
1110                 const struct ttm_place *place = &placement->placement[i];
1111                 struct ttm_mem_type_manager *man;
1112 
1113                 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1114                 if (ret == -EBUSY)
1115                         continue;
1116                 if (ret)
1117                         goto error;
1118 
1119                 type_found = true;
1120                 mem->mm_node = NULL;
1121                 if (mem->mem_type == TTM_PL_SYSTEM)
1122                         return 0;
1123 
1124                 man = &bdev->man[mem->mem_type];
1125                 ret = (*man->func->get_node)(man, bo, place, mem);
1126                 if (unlikely(ret))
1127                         goto error;
1128 
1129                 if (!mem->mm_node)
1130                         continue;
1131 
1132                 ret = ttm_bo_add_move_fence(bo, man, mem, ctx->no_wait_gpu);
1133                 if (unlikely(ret)) {
1134                         (*man->func->put_node)(man, mem);
1135                         if (ret == -EBUSY)
1136                                 continue;
1137 
1138                         goto error;
1139                 }
1140                 return 0;
1141         }
1142 
1143         for (i = 0; i < placement->num_busy_placement; ++i) {
1144                 const struct ttm_place *place = &placement->busy_placement[i];
1145 
1146                 ret = ttm_bo_mem_placement(bo, place, mem, ctx);
1147                 if (ret == -EBUSY)
1148                         continue;
1149                 if (ret)
1150                         goto error;
1151 
1152                 type_found = true;
1153                 mem->mm_node = NULL;
1154                 if (mem->mem_type == TTM_PL_SYSTEM)
1155                         return 0;
1156 
1157                 ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
1158                 if (ret == 0 && mem->mm_node)
1159                         return 0;
1160 
1161                 if (ret && ret != -EBUSY)
1162                         goto error;
1163         }
1164 
1165         ret = -ENOMEM;
1166         if (!type_found) {
1167                 pr_err(TTM_PFX "No compatible memory type found\n");
1168                 ret = -EINVAL;
1169         }
1170 
1171 error:
1172         if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {
1173                 spin_lock(&bo->bdev->glob->lru_lock);
1174                 ttm_bo_move_to_lru_tail(bo, NULL);
1175                 spin_unlock(&bo->bdev->glob->lru_lock);
1176         }
1177 
1178         return ret;
1179 }
1180 EXPORT_SYMBOL(ttm_bo_mem_space);
1181 
1182 static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
1183                               struct ttm_placement *placement,
1184                               struct ttm_operation_ctx *ctx)
1185 {
1186         int ret = 0;
1187         struct ttm_mem_reg mem;
1188 
1189         dma_resv_assert_held(bo->base.resv);
1190 
1191         mem.num_pages = bo->num_pages;
1192         mem.size = mem.num_pages << PAGE_SHIFT;
1193         mem.page_alignment = bo->mem.page_alignment;
1194         mem.bus.io_reserved_vm = false;
1195         mem.bus.io_reserved_count = 0;
1196         /*
1197          * Determine where to move the buffer.
1198          */
1199         ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
1200         if (ret)
1201                 goto out_unlock;
1202         ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx);
1203 out_unlock:
1204         if (ret && mem.mm_node)
1205                 ttm_bo_mem_put(bo, &mem);
1206         return ret;
1207 }
1208 
1209 static bool ttm_bo_places_compat(const struct ttm_place *places,
1210                                  unsigned num_placement,
1211                                  struct ttm_mem_reg *mem,
1212                                  uint32_t *new_flags)
1213 {
1214         unsigned i;
1215 
1216         for (i = 0; i < num_placement; i++) {
1217                 const struct ttm_place *heap = &places[i];
1218 
1219                 if (mem->mm_node && (mem->start < heap->fpfn ||
1220                      (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
1221                         continue;
1222 
1223                 *new_flags = heap->flags;
1224                 if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
1225                     (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
1226                     (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
1227                      (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
1228                         return true;
1229         }
1230         return false;
1231 }
1232 
1233 bool ttm_bo_mem_compat(struct ttm_placement *placement,
1234                        struct ttm_mem_reg *mem,
1235                        uint32_t *new_flags)
1236 {
1237         if (ttm_bo_places_compat(placement->placement, placement->num_placement,
1238                                  mem, new_flags))
1239                 return true;
1240 
1241         if ((placement->busy_placement != placement->placement ||
1242              placement->num_busy_placement > placement->num_placement) &&
1243             ttm_bo_places_compat(placement->busy_placement,
1244                                  placement->num_busy_placement,
1245                                  mem, new_flags))
1246                 return true;
1247 
1248         return false;
1249 }
1250 EXPORT_SYMBOL(ttm_bo_mem_compat);
1251 
1252 int ttm_bo_validate(struct ttm_buffer_object *bo,
1253                     struct ttm_placement *placement,
1254                     struct ttm_operation_ctx *ctx)
1255 {
1256         int ret;
1257         uint32_t new_flags;
1258 
1259         dma_resv_assert_held(bo->base.resv);
1260         /*
1261          * Check whether we need to move buffer.
1262          */
1263         if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {
1264                 ret = ttm_bo_move_buffer(bo, placement, ctx);
1265                 if (ret)
1266                         return ret;
1267         } else {
1268                 /*
1269                  * Use the access and other non-mapping-related flag bits from
1270                  * the compatible memory placement flags to the active flags
1271                  */
1272                 ttm_flag_masked(&bo->mem.placement, new_flags,
1273                                 ~TTM_PL_MASK_MEMTYPE);
1274         }
1275         /*
1276          * We might need to add a TTM.
1277          */
1278         if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
1279                 ret = ttm_tt_create(bo, true);
1280                 if (ret)
1281                         return ret;
1282         }
1283         return 0;
1284 }
1285 EXPORT_SYMBOL(ttm_bo_validate);
1286 
1287 int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
1288                          struct ttm_buffer_object *bo,
1289                          unsigned long size,
1290                          enum ttm_bo_type type,
1291                          struct ttm_placement *placement,
1292                          uint32_t page_alignment,
1293                          struct ttm_operation_ctx *ctx,
1294                          size_t acc_size,
1295                          struct sg_table *sg,
1296                          struct dma_resv *resv,
1297                          void (*destroy) (struct ttm_buffer_object *))
1298 {
1299         int ret = 0;
1300         unsigned long num_pages;
1301         struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
1302         bool locked;
1303 
1304         ret = ttm_mem_global_alloc(mem_glob, acc_size, ctx);
1305         if (ret) {
1306                 pr_err("Out of kernel memory\n");
1307                 if (destroy)
1308                         (*destroy)(bo);
1309                 else
1310                         kfree(bo);
1311                 return -ENOMEM;
1312         }
1313 
1314         num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
1315         if (num_pages == 0) {
1316                 pr_err("Illegal buffer object size\n");
1317                 if (destroy)
1318                         (*destroy)(bo);
1319                 else
1320                         kfree(bo);
1321                 ttm_mem_global_free(mem_glob, acc_size);
1322                 return -EINVAL;
1323         }
1324         bo->destroy = destroy ? destroy : ttm_bo_default_destroy;
1325 
1326         kref_init(&bo->kref);
1327         kref_init(&bo->list_kref);
1328         atomic_set(&bo->cpu_writers, 0);
1329         INIT_LIST_HEAD(&bo->lru);
1330         INIT_LIST_HEAD(&bo->ddestroy);
1331         INIT_LIST_HEAD(&bo->swap);
1332         INIT_LIST_HEAD(&bo->io_reserve_lru);
1333         mutex_init(&bo->wu_mutex);
1334         bo->bdev = bdev;
1335         bo->type = type;
1336         bo->num_pages = num_pages;
1337         bo->mem.size = num_pages << PAGE_SHIFT;
1338         bo->mem.mem_type = TTM_PL_SYSTEM;
1339         bo->mem.num_pages = bo->num_pages;
1340         bo->mem.mm_node = NULL;
1341         bo->mem.page_alignment = page_alignment;
1342         bo->mem.bus.io_reserved_vm = false;
1343         bo->mem.bus.io_reserved_count = 0;
1344         bo->moving = NULL;
1345         bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED);
1346         bo->acc_size = acc_size;
1347         bo->sg = sg;
1348         if (resv) {
1349                 bo->base.resv = resv;
1350                 dma_resv_assert_held(bo->base.resv);
1351         } else {
1352                 bo->base.resv = &bo->base._resv;
1353         }
1354         if (!ttm_bo_uses_embedded_gem_object(bo)) {
1355                 /*
1356                  * bo.gem is not initialized, so we have to setup the
1357                  * struct elements we want use regardless.
1358                  */
1359                 dma_resv_init(&bo->base._resv);
1360                 drm_vma_node_reset(&bo->base.vma_node);
1361         }
1362         atomic_inc(&bo->bdev->glob->bo_count);
1363 
1364         /*
1365          * For ttm_bo_type_device buffers, allocate
1366          * address space from the device.
1367          */
1368         if (bo->type == ttm_bo_type_device ||
1369             bo->type == ttm_bo_type_sg)
1370                 ret = drm_vma_offset_add(&bdev->vma_manager, &bo->base.vma_node,
1371                                          bo->mem.num_pages);
1372 
1373         /* passed reservation objects should already be locked,
1374          * since otherwise lockdep will be angered in radeon.
1375          */
1376         if (!resv) {
1377                 locked = dma_resv_trylock(bo->base.resv);
1378                 WARN_ON(!locked);
1379         }
1380 
1381         if (likely(!ret))
1382                 ret = ttm_bo_validate(bo, placement, ctx);
1383 
1384         if (unlikely(ret)) {
1385                 if (!resv)
1386                         ttm_bo_unreserve(bo);
1387 
1388                 ttm_bo_put(bo);
1389                 return ret;
1390         }
1391 
1392         if (resv && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
1393                 spin_lock(&bdev->glob->lru_lock);
1394                 ttm_bo_add_to_lru(bo);
1395                 spin_unlock(&bdev->glob->lru_lock);
1396         }
1397 
1398         return ret;
1399 }
1400 EXPORT_SYMBOL(ttm_bo_init_reserved);
1401 
1402 int ttm_bo_init(struct ttm_bo_device *bdev,
1403                 struct ttm_buffer_object *bo,
1404                 unsigned long size,
1405                 enum ttm_bo_type type,
1406                 struct ttm_placement *placement,
1407                 uint32_t page_alignment,
1408                 bool interruptible,
1409                 size_t acc_size,
1410                 struct sg_table *sg,
1411                 struct dma_resv *resv,
1412                 void (*destroy) (struct ttm_buffer_object *))
1413 {
1414         struct ttm_operation_ctx ctx = { interruptible, false };
1415         int ret;
1416 
1417         ret = ttm_bo_init_reserved(bdev, bo, size, type, placement,
1418                                    page_alignment, &ctx, acc_size,
1419                                    sg, resv, destroy);
1420         if (ret)
1421                 return ret;
1422 
1423         if (!resv)
1424                 ttm_bo_unreserve(bo);
1425 
1426         return 0;
1427 }
1428 EXPORT_SYMBOL(ttm_bo_init);
1429 
1430 size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
1431                        unsigned long bo_size,
1432                        unsigned struct_size)
1433 {
1434         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1435         size_t size = 0;
1436 
1437         size += ttm_round_pot(struct_size);
1438         size += ttm_round_pot(npages * sizeof(void *));
1439         size += ttm_round_pot(sizeof(struct ttm_tt));
1440         return size;
1441 }
1442 EXPORT_SYMBOL(ttm_bo_acc_size);
1443 
1444 size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
1445                            unsigned long bo_size,
1446                            unsigned struct_size)
1447 {
1448         unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT;
1449         size_t size = 0;
1450 
1451         size += ttm_round_pot(struct_size);
1452         size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
1453         size += ttm_round_pot(sizeof(struct ttm_dma_tt));
1454         return size;
1455 }
1456 EXPORT_SYMBOL(ttm_bo_dma_acc_size);
1457 
1458 int ttm_bo_create(struct ttm_bo_device *bdev,
1459                         unsigned long size,
1460                         enum ttm_bo_type type,
1461                         struct ttm_placement *placement,
1462                         uint32_t page_alignment,
1463                         bool interruptible,
1464                         struct ttm_buffer_object **p_bo)
1465 {
1466         struct ttm_buffer_object *bo;
1467         size_t acc_size;
1468         int ret;
1469 
1470         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
1471         if (unlikely(bo == NULL))
1472                 return -ENOMEM;
1473 
1474         acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
1475         ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
1476                           interruptible, acc_size,
1477                           NULL, NULL, NULL);
1478         if (likely(ret == 0))
1479                 *p_bo = bo;
1480 
1481         return ret;
1482 }
1483 EXPORT_SYMBOL(ttm_bo_create);
1484 
1485 static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
1486                                    unsigned mem_type)
1487 {
1488         struct ttm_operation_ctx ctx = {
1489                 .interruptible = false,
1490                 .no_wait_gpu = false,
1491                 .flags = TTM_OPT_FLAG_FORCE_ALLOC
1492         };
1493         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1494         struct ttm_bo_global *glob = bdev->glob;
1495         struct dma_fence *fence;
1496         int ret;
1497         unsigned i;
1498 
1499         /*
1500          * Can't use standard list traversal since we're unlocking.
1501          */
1502 
1503         spin_lock(&glob->lru_lock);
1504         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1505                 while (!list_empty(&man->lru[i])) {
1506                         spin_unlock(&glob->lru_lock);
1507                         ret = ttm_mem_evict_first(bdev, mem_type, NULL, &ctx,
1508                                                   NULL);
1509                         if (ret)
1510                                 return ret;
1511                         spin_lock(&glob->lru_lock);
1512                 }
1513         }
1514         spin_unlock(&glob->lru_lock);
1515 
1516         spin_lock(&man->move_lock);
1517         fence = dma_fence_get(man->move);
1518         spin_unlock(&man->move_lock);
1519 
1520         if (fence) {
1521                 ret = dma_fence_wait(fence, false);
1522                 dma_fence_put(fence);
1523                 if (ret)
1524                         return ret;
1525         }
1526 
1527         return 0;
1528 }
1529 
1530 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1531 {
1532         struct ttm_mem_type_manager *man;
1533         int ret = -EINVAL;
1534 
1535         if (mem_type >= TTM_NUM_MEM_TYPES) {
1536                 pr_err("Illegal memory type %d\n", mem_type);
1537                 return ret;
1538         }
1539         man = &bdev->man[mem_type];
1540 
1541         if (!man->has_type) {
1542                 pr_err("Trying to take down uninitialized memory manager type %u\n",
1543                        mem_type);
1544                 return ret;
1545         }
1546 
1547         man->use_type = false;
1548         man->has_type = false;
1549 
1550         ret = 0;
1551         if (mem_type > 0) {
1552                 ret = ttm_bo_force_list_clean(bdev, mem_type);
1553                 if (ret) {
1554                         pr_err("Cleanup eviction failed\n");
1555                         return ret;
1556                 }
1557 
1558                 ret = (*man->func->takedown)(man);
1559         }
1560 
1561         dma_fence_put(man->move);
1562         man->move = NULL;
1563 
1564         return ret;
1565 }
1566 EXPORT_SYMBOL(ttm_bo_clean_mm);
1567 
1568 int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type)
1569 {
1570         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
1571 
1572         if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) {
1573                 pr_err("Illegal memory manager memory type %u\n", mem_type);
1574                 return -EINVAL;
1575         }
1576 
1577         if (!man->has_type) {
1578                 pr_err("Memory type %u has not been initialized\n", mem_type);
1579                 return 0;
1580         }
1581 
1582         return ttm_bo_force_list_clean(bdev, mem_type);
1583 }
1584 EXPORT_SYMBOL(ttm_bo_evict_mm);
1585 
1586 int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
1587                         unsigned long p_size)
1588 {
1589         int ret;
1590         struct ttm_mem_type_manager *man;
1591         unsigned i;
1592 
1593         BUG_ON(type >= TTM_NUM_MEM_TYPES);
1594         man = &bdev->man[type];
1595         BUG_ON(man->has_type);
1596         man->io_reserve_fastpath = true;
1597         man->use_io_reserve_lru = false;
1598         mutex_init(&man->io_reserve_mutex);
1599         spin_lock_init(&man->move_lock);
1600         INIT_LIST_HEAD(&man->io_reserve_lru);
1601 
1602         ret = bdev->driver->init_mem_type(bdev, type, man);
1603         if (ret)
1604                 return ret;
1605         man->bdev = bdev;
1606 
1607         if (type != TTM_PL_SYSTEM) {
1608                 ret = (*man->func->init)(man, p_size);
1609                 if (ret)
1610                         return ret;
1611         }
1612         man->has_type = true;
1613         man->use_type = true;
1614         man->size = p_size;
1615 
1616         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1617                 INIT_LIST_HEAD(&man->lru[i]);
1618         man->move = NULL;
1619 
1620         return 0;
1621 }
1622 EXPORT_SYMBOL(ttm_bo_init_mm);
1623 
1624 static void ttm_bo_global_kobj_release(struct kobject *kobj)
1625 {
1626         struct ttm_bo_global *glob =
1627                 container_of(kobj, struct ttm_bo_global, kobj);
1628 
1629         __free_page(glob->dummy_read_page);
1630 }
1631 
1632 static void ttm_bo_global_release(void)
1633 {
1634         struct ttm_bo_global *glob = &ttm_bo_glob;
1635 
1636         mutex_lock(&ttm_global_mutex);
1637         if (--ttm_bo_glob_use_count > 0)
1638                 goto out;
1639 
1640         kobject_del(&glob->kobj);
1641         kobject_put(&glob->kobj);
1642         ttm_mem_global_release(&ttm_mem_glob);
1643         memset(glob, 0, sizeof(*glob));
1644 out:
1645         mutex_unlock(&ttm_global_mutex);
1646 }
1647 
1648 static int ttm_bo_global_init(void)
1649 {
1650         struct ttm_bo_global *glob = &ttm_bo_glob;
1651         int ret = 0;
1652         unsigned i;
1653 
1654         mutex_lock(&ttm_global_mutex);
1655         if (++ttm_bo_glob_use_count > 1)
1656                 goto out;
1657 
1658         ret = ttm_mem_global_init(&ttm_mem_glob);
1659         if (ret)
1660                 goto out;
1661 
1662         spin_lock_init(&glob->lru_lock);
1663         glob->mem_glob = &ttm_mem_glob;
1664         glob->mem_glob->bo_glob = glob;
1665         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
1666 
1667         if (unlikely(glob->dummy_read_page == NULL)) {
1668                 ret = -ENOMEM;
1669                 goto out;
1670         }
1671 
1672         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1673                 INIT_LIST_HEAD(&glob->swap_lru[i]);
1674         INIT_LIST_HEAD(&glob->device_list);
1675         atomic_set(&glob->bo_count, 0);
1676 
1677         ret = kobject_init_and_add(
1678                 &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects");
1679         if (unlikely(ret != 0))
1680                 kobject_put(&glob->kobj);
1681 out:
1682         mutex_unlock(&ttm_global_mutex);
1683         return ret;
1684 }
1685 
1686 int ttm_bo_device_release(struct ttm_bo_device *bdev)
1687 {
1688         int ret = 0;
1689         unsigned i = TTM_NUM_MEM_TYPES;
1690         struct ttm_mem_type_manager *man;
1691         struct ttm_bo_global *glob = bdev->glob;
1692 
1693         while (i--) {
1694                 man = &bdev->man[i];
1695                 if (man->has_type) {
1696                         man->use_type = false;
1697                         if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) {
1698                                 ret = -EBUSY;
1699                                 pr_err("DRM memory manager type %d is not clean\n",
1700                                        i);
1701                         }
1702                         man->has_type = false;
1703                 }
1704         }
1705 
1706         mutex_lock(&ttm_global_mutex);
1707         list_del(&bdev->device_list);
1708         mutex_unlock(&ttm_global_mutex);
1709 
1710         cancel_delayed_work_sync(&bdev->wq);
1711 
1712         if (ttm_bo_delayed_delete(bdev, true))
1713                 pr_debug("Delayed destroy list was clean\n");
1714 
1715         spin_lock(&glob->lru_lock);
1716         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
1717                 if (list_empty(&bdev->man[0].lru[0]))
1718                         pr_debug("Swap list %d was clean\n", i);
1719         spin_unlock(&glob->lru_lock);
1720 
1721         drm_vma_offset_manager_destroy(&bdev->vma_manager);
1722 
1723         if (!ret)
1724                 ttm_bo_global_release();
1725 
1726         return ret;
1727 }
1728 EXPORT_SYMBOL(ttm_bo_device_release);
1729 
1730 int ttm_bo_device_init(struct ttm_bo_device *bdev,
1731                        struct ttm_bo_driver *driver,
1732                        struct address_space *mapping,
1733                        bool need_dma32)
1734 {
1735         struct ttm_bo_global *glob = &ttm_bo_glob;
1736         int ret;
1737 
1738         ret = ttm_bo_global_init();
1739         if (ret)
1740                 return ret;
1741 
1742         bdev->driver = driver;
1743 
1744         memset(bdev->man, 0, sizeof(bdev->man));
1745 
1746         /*
1747          * Initialize the system memory buffer type.
1748          * Other types need to be driver / IOCTL initialized.
1749          */
1750         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0);
1751         if (unlikely(ret != 0))
1752                 goto out_no_sys;
1753 
1754         drm_vma_offset_manager_init(&bdev->vma_manager,
1755                                     DRM_FILE_PAGE_OFFSET_START,
1756                                     DRM_FILE_PAGE_OFFSET_SIZE);
1757         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
1758         INIT_LIST_HEAD(&bdev->ddestroy);
1759         bdev->dev_mapping = mapping;
1760         bdev->glob = glob;
1761         bdev->need_dma32 = need_dma32;
1762         mutex_lock(&ttm_global_mutex);
1763         list_add_tail(&bdev->device_list, &glob->device_list);
1764         mutex_unlock(&ttm_global_mutex);
1765 
1766         return 0;
1767 out_no_sys:
1768         ttm_bo_global_release();
1769         return ret;
1770 }
1771 EXPORT_SYMBOL(ttm_bo_device_init);
1772 
1773 /*
1774  * buffer object vm functions.
1775  */
1776 
1777 bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
1778 {
1779         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
1780 
1781         if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
1782                 if (mem->mem_type == TTM_PL_SYSTEM)
1783                         return false;
1784 
1785                 if (man->flags & TTM_MEMTYPE_FLAG_CMA)
1786                         return false;
1787 
1788                 if (mem->placement & TTM_PL_FLAG_CACHED)
1789                         return false;
1790         }
1791         return true;
1792 }
1793 
1794 void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo)
1795 {
1796         struct ttm_bo_device *bdev = bo->bdev;
1797 
1798         drm_vma_node_unmap(&bo->base.vma_node, bdev->dev_mapping);
1799         ttm_mem_io_free_vm(bo);
1800 }
1801 
1802 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo)
1803 {
1804         struct ttm_bo_device *bdev = bo->bdev;
1805         struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];
1806 
1807         ttm_mem_io_lock(man, false);
1808         ttm_bo_unmap_virtual_locked(bo);
1809         ttm_mem_io_unlock(man);
1810 }
1811 
1812 
1813 EXPORT_SYMBOL(ttm_bo_unmap_virtual);
1814 
1815 int ttm_bo_wait(struct ttm_buffer_object *bo,
1816                 bool interruptible, bool no_wait)
1817 {
1818         long timeout = 15 * HZ;
1819 
1820         if (no_wait) {
1821                 if (dma_resv_test_signaled_rcu(bo->base.resv, true))
1822                         return 0;
1823                 else
1824                         return -EBUSY;
1825         }
1826 
1827         timeout = dma_resv_wait_timeout_rcu(bo->base.resv, true,
1828                                                       interruptible, timeout);
1829         if (timeout < 0)
1830                 return timeout;
1831 
1832         if (timeout == 0)
1833                 return -EBUSY;
1834 
1835         dma_resv_add_excl_fence(bo->base.resv, NULL);
1836         return 0;
1837 }
1838 EXPORT_SYMBOL(ttm_bo_wait);
1839 
1840 int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait)
1841 {
1842         int ret = 0;
1843 
1844         /*
1845          * Using ttm_bo_reserve makes sure the lru lists are updated.
1846          */
1847 
1848         ret = ttm_bo_reserve(bo, true, no_wait, NULL);
1849         if (unlikely(ret != 0))
1850                 return ret;
1851         ret = ttm_bo_wait(bo, true, no_wait);
1852         if (likely(ret == 0))
1853                 atomic_inc(&bo->cpu_writers);
1854         ttm_bo_unreserve(bo);
1855         return ret;
1856 }
1857 EXPORT_SYMBOL(ttm_bo_synccpu_write_grab);
1858 
1859 void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
1860 {
1861         atomic_dec(&bo->cpu_writers);
1862 }
1863 EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
1864 
1865 /**
1866  * A buffer object shrink method that tries to swap out the first
1867  * buffer object on the bo_global::swap_lru list.
1868  */
1869 int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
1870 {
1871         struct ttm_buffer_object *bo;
1872         int ret = -EBUSY;
1873         bool locked;
1874         unsigned i;
1875 
1876         spin_lock(&glob->lru_lock);
1877         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
1878                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
1879                         if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked,
1880                                                            NULL)) {
1881                                 ret = 0;
1882                                 break;
1883                         }
1884                 }
1885                 if (!ret)
1886                         break;
1887         }
1888 
1889         if (ret) {
1890                 spin_unlock(&glob->lru_lock);
1891                 return ret;
1892         }
1893 
1894         kref_get(&bo->list_kref);
1895 
1896         if (!list_empty(&bo->ddestroy)) {
1897                 ret = ttm_bo_cleanup_refs(bo, false, false, locked);
1898                 kref_put(&bo->list_kref, ttm_bo_release_list);
1899                 return ret;
1900         }
1901 
1902         ttm_bo_del_from_lru(bo);
1903         spin_unlock(&glob->lru_lock);
1904 
1905         /**
1906          * Move to system cached
1907          */
1908 
1909         if (bo->mem.mem_type != TTM_PL_SYSTEM ||
1910             bo->ttm->caching_state != tt_cached) {
1911                 struct ttm_operation_ctx ctx = { false, false };
1912                 struct ttm_mem_reg evict_mem;
1913 
1914                 evict_mem = bo->mem;
1915                 evict_mem.mm_node = NULL;
1916                 evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
1917                 evict_mem.mem_type = TTM_PL_SYSTEM;
1918 
1919                 ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, &ctx);
1920                 if (unlikely(ret != 0))
1921                         goto out;
1922         }
1923 
1924         /**
1925          * Make sure BO is idle.
1926          */
1927 
1928         ret = ttm_bo_wait(bo, false, false);
1929         if (unlikely(ret != 0))
1930                 goto out;
1931 
1932         ttm_bo_unmap_virtual(bo);
1933 
1934         /**
1935          * Swap out. Buffer will be swapped in again as soon as
1936          * anyone tries to access a ttm page.
1937          */
1938 
1939         if (bo->bdev->driver->swap_notify)
1940                 bo->bdev->driver->swap_notify(bo);
1941 
1942         ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
1943 out:
1944 
1945         /**
1946          *
1947          * Unreserve without putting on LRU to avoid swapping out an
1948          * already swapped buffer.
1949          */
1950         if (locked)
1951                 dma_resv_unlock(bo->base.resv);
1952         kref_put(&bo->list_kref, ttm_bo_release_list);
1953         return ret;
1954 }
1955 EXPORT_SYMBOL(ttm_bo_swapout);
1956 
1957 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
1958 {
1959         struct ttm_operation_ctx ctx = {
1960                 .interruptible = false,
1961                 .no_wait_gpu = false
1962         };
1963 
1964         while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
1965                 ;
1966 }
1967 EXPORT_SYMBOL(ttm_bo_swapout_all);
1968 
1969 /**
1970  * ttm_bo_wait_unreserved - interruptible wait for a buffer object to become
1971  * unreserved
1972  *
1973  * @bo: Pointer to buffer
1974  */
1975 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo)
1976 {
1977         int ret;
1978 
1979         /*
1980          * In the absense of a wait_unlocked API,
1981          * Use the bo::wu_mutex to avoid triggering livelocks due to
1982          * concurrent use of this function. Note that this use of
1983          * bo::wu_mutex can go away if we change locking order to
1984          * mmap_sem -> bo::reserve.
1985          */
1986         ret = mutex_lock_interruptible(&bo->wu_mutex);
1987         if (unlikely(ret != 0))
1988                 return -ERESTARTSYS;
1989         if (!dma_resv_is_locked(bo->base.resv))
1990                 goto out_unlock;
1991         ret = dma_resv_lock_interruptible(bo->base.resv, NULL);
1992         if (ret == -EINTR)
1993                 ret = -ERESTARTSYS;
1994         if (unlikely(ret != 0))
1995                 goto out_unlock;
1996         dma_resv_unlock(bo->base.resv);
1997 
1998 out_unlock:
1999         mutex_unlock(&bo->wu_mutex);
2000         return ret;
2001 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/gpu/drm/ttm/ttm_bo.c

DEFINITIONS
