Re: [PATCH 11/45] drm/ttm: split out the move to system from move ttm code

[Christian König <christian.koenig@xxxxxxx>]

What should that be good for?

Am 24.09.20 um 07:18 schrieb Dave Airlie:
> From: Dave Airlie <airlied@xxxxxxxxxx>
>
> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
> ---
>   drivers/gpu/drm/ttm/ttm_bo_util.c | 39 ++++++++++++++++++++-----------
>   1 file changed, 25 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
> index aecdb2d92a54..0ad02e27865d 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_util.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
> @@ -73,27 +73,38 @@ int ttm_bo_move_to_new_tt_mem(struct ttm_buffer_object *bo,
>   	return 0;
>   }
>   
> -int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
> -		   struct ttm_operation_ctx *ctx,
> -		    struct ttm_resource *new_mem)
> +static int ttm_bo_move_old_to_system(struct ttm_buffer_object *bo,
> +				     struct ttm_operation_ctx *ctx)
>   {
>   	struct ttm_resource *old_mem = &bo->mem;
>   	int ret;
>   
> -	if (old_mem->mem_type != TTM_PL_SYSTEM) {
> -		ret = ttm_bo_wait_ctx(bo, ctx);
> -
> -		if (unlikely(ret != 0)) {
> -			if (ret != -ERESTARTSYS)
> -				pr_err("Failed to expire sync object before unbinding TTM\n");
> -			return ret;
> -		}
> +	if (old_mem->mem_type == TTM_PL_SYSTEM)
> +		return 0;
>   
> -		ttm_bo_tt_unbind(bo);
> -		ttm_bo_free_old_node(bo);
> -		old_mem->mem_type = TTM_PL_SYSTEM;
> +	ret = ttm_bo_wait_ctx(bo, ctx);
> +	if (unlikely(ret != 0)) {
> +		if (ret != -ERESTARTSYS)
> +			pr_err("Failed to expire sync object before unbinding TTM\n");
> +		return ret;
>   	}
>   
> +	ttm_bo_tt_unbind(bo);
> +	ttm_bo_free_old_node(bo);
> +	old_mem->mem_type = TTM_PL_SYSTEM;
> +	return 0;
> +}
> +
> +int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
> +		   struct ttm_operation_ctx *ctx,
> +		    struct ttm_resource *new_mem)
> +{
> +	int ret;
> +
> +	ret = ttm_bo_move_old_to_system(bo, ctx);
> +	if (ret)
> +		return ret;
> +
>   	ret = ttm_bo_move_to_new_tt_mem(bo, ctx, new_mem);
>   	if (ret)
>   		return ret;

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