LGTM,
Although perhaps check that the LRU lock is held as well.
Reviewed-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
On 01/11/2016 03:35 PM, Christian König wrote:
> From: Christian König <christian.koenig@xxxxxxx>
>
> This allows the drivers to move a BO to the end of the LRU
> without removing and adding it again.
>
> v2: Make it more robust, handle pinned and swapable BOs as well.
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> ---
> drivers/gpu/drm/ttm/ttm_bo.c | 21 +++++++++++++++++++++
> include/drm/ttm/ttm_bo_api.h | 10 ++++++++++
> 2 files changed, 31 insertions(+)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 3ea9a01..4cbf265 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -228,6 +228,27 @@ void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
> }
> EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
>
> +void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
> +{
> + struct ttm_bo_device *bdev = bo->bdev;
> + struct ttm_mem_type_manager *man;
> +
> + lockdep_assert_held(&bo->resv->lock.base);
> +
> + if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
> + list_del_init(&bo->swap);
> + list_del_init(&bo->lru);
> +
> + } else {
> + if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG))
> + list_move_tail(&bo->swap, &bo->glob->swap_lru);
> +
> + man = &bdev->man[bo->mem.mem_type];
> + list_move_tail(&bo->lru, &man->lru);
> + }
> +}
> +EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
> +
> /*
> * Call bo->mutex locked.
> */
> diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
> index c768ddf..afae231 100644
> --- a/include/drm/ttm/ttm_bo_api.h
> +++ b/include/drm/ttm/ttm_bo_api.h
> @@ -383,6 +383,16 @@ extern void ttm_bo_add_to_lru(struct ttm_buffer_object *bo);
> */
> extern int ttm_bo_del_from_lru(struct ttm_buffer_object *bo);
>
> +/**
> + * ttm_bo_move_to_lru_tail
> + *
> + * @bo: The buffer object.
> + *
> + * Move this BO to the tail of all lru lists used to lookup and reserve an
> + * object. This function must be called with struct ttm_bo_global::lru_lock
> + * held, and is used to make a BO less likely to be considered for eviction.
> + */
> +extern void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo);
>
> /**
> * ttm_bo_lock_delayed_workqueue
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