static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
bool interruptible,
bool no_wait_reserve,
bool no_wait_gpu)
{
struct ttm_bo_device *bdev = bo->bdev;
struct ttm_bo_global *glob = bo->glob;
int put_count;
int ret = 0;
retry:
spin_lock(&bdev->fence_lock);
ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
spin_unlock(&bdev->fence_lock);
if (unlikely(ret != 0))
return ret;
spin_lock(&glob->lru_lock);
if (unlikely(list_empty(&bo->ddestroy))) {
spin_unlock(&glob->lru_lock);
return 0;
}
ret = ttm_bo_reserve_locked(bo, interruptible,
no_wait_reserve, false, 0);
if (unlikely(ret != 0)) {
spin_unlock(&glob->lru_lock);
return ret;
}
/**
* We can re-check for sync object without taking
* the bo::lock since setting the sync object requires
* also bo::reserved. A busy object at this point may
* be caused by another thread recently starting an accelerated
* eviction.
*/
if (unlikely(bo->sync_obj)) {
atomic_set(&bo->reserved, 0);
wake_up_all(&bo->event_queue);
spin_unlock(&glob->lru_lock);
goto retry;
}
put_count = ttm_bo_del_from_lru(bo);
list_del_init(&bo->ddestroy);
++put_count;
spin_unlock(&glob->lru_lock);
ttm_bo_cleanup_memtype_use(bo);
ttm_bo_list_ref_sub(bo, put_count, true);
return 0;
}
static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)
{
struct ttm_bo_device *bdev = bo->bdev;
struct ttm_bo_global *glob = bo->glob;
struct ttm_bo_driver *driver;
void *sync_obj = NULL;
void *sync_obj_arg;
int put_count;
int ret;
spin_lock(&bdev->fence_lock);
(void) ttm_bo_wait(bo, false, false, true);
if (!bo->sync_obj) {
spin_lock(&glob->lru_lock);
/**
* Lock inversion between bo:reserve and bdev::fence_lock here,
* but that's OK, since we're only trylocking.
*/
ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
if (unlikely(ret == -EBUSY))
goto queue;
spin_unlock(&bdev->fence_lock);
put_count = ttm_bo_del_from_lru(bo);
spin_unlock(&glob->lru_lock);
ttm_bo_cleanup_memtype_use(bo);
ttm_bo_list_ref_sub(bo, put_count, true);
return;
} else {
spin_lock(&glob->lru_lock);
}
queue:
driver = bdev->driver;
if (bo->sync_obj)
sync_obj = driver->sync_obj_ref(bo->sync_obj);
sync_obj_arg = bo->sync_obj_arg;
kref_get(&bo->list_kref);
list_add_tail(&bo->ddestroy, &bdev->ddestroy);
spin_unlock(&glob->lru_lock);
spin_unlock(&bdev->fence_lock);
if (sync_obj) {
driver->sync_obj_flush(sync_obj, sync_obj_arg);
driver->sync_obj_unref(&sync_obj);
}
schedule_delayed_work(&bdev->wq,
((HZ / 100) < 1) ? 1 : HZ / 100);
}
