[PATCH 1/2] drm/ttm: add lru notify to bo driver v2

[Koenig, Christian]

Am 14.01.19 um 08:02 schrieb Chunming Zhou:
> allow driver do somethings when lru changed.
> v2:
> address Michel's comments.
>
> Change-Id: Ie82053da49272881d4b52b1c406f7c221a3fcadf
> Signed-off-by: Chunming Zhou <david1.zhou at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/ttm/ttm_bo.c    | 11 +++++++----
>   include/drm/ttm/ttm_bo_driver.h |  9 +++++++++
>   2 files changed, 16 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 0ec08394e17a..de088c8070fb 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -198,19 +198,22 @@ static void ttm_bo_ref_bug(struct kref *list_kref)
>   
>   void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
>   {
> +	struct ttm_bo_device *bdev = bo->bdev;
> +	bool notify = false;
> +
>   	if (!list_empty(&bo->swap)) {
>   		list_del_init(&bo->swap);
>   		kref_put(&bo->list_kref, ttm_bo_ref_bug);
> +		notify = true;
>   	}
>   	if (!list_empty(&bo->lru)) {
>   		list_del_init(&bo->lru);
>   		kref_put(&bo->list_kref, ttm_bo_ref_bug);
> +		notify = true;
>   	}
>   
> -	/*
> -	 * TODO: Add a driver hook to delete from
> -	 * driver-specific LRU's here.
> -	 */
> +	if (notify && bdev->driver->del_from_lru_notify)
> +		bdev->driver->del_from_lru_notify(bo);
>   }
>   
>   void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
> diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
> index 1021106438b2..15829b24277c 100644
> --- a/include/drm/ttm/ttm_bo_driver.h
> +++ b/include/drm/ttm/ttm_bo_driver.h
> @@ -381,6 +381,15 @@ struct ttm_bo_driver {
>   	 */
>   	int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset,
>   			     void *buf, int len, int write);
> +
> +	/**
> +	 * struct ttm_bo_driver member del_from_lru_notify
> +	 *
> +	 * @bo: the buffer object deleted from lru
> +	 *
> +	 * notify driver that a BO was deleted from LRU.
> +	 */
> +	void (*del_from_lru_notify)(struct ttm_buffer_object *bo);
>   };
>   
>   /**