[igt-dev] [PATCH i-g-t 5/8] igt/params: add generic saving module parameter set

[Petri Latvala]

On Tue, Apr 21, 2020 at 07:17:22PM +0300, Juha-Pekka Heikkila wrote:
> From: Jani Nikula <jani.nikula at intel.com>
> 
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
> ---
>  lib/igt_params.c | 56 ++++++++++++++++++++++++++++++++++++++++--------
>  lib/igt_params.h |  3 +++
>  2 files changed, 50 insertions(+), 9 deletions(-)
> 
> diff --git a/lib/igt_params.c b/lib/igt_params.c
> index fe4b1df3..8de47b02 100644
> --- a/lib/igt_params.c
> +++ b/lib/igt_params.c
> @@ -153,6 +153,29 @@ int igt_params_open(int device)
>  	return __igt_params_open(device, NULL);
>  }
>  
> +__attribute__((format(printf, 3, 0)))
> +static bool __igt_params_set(int device, const char *parameter,
> +			     const char *fmt, va_list ap, bool save)
> +{
> +	char *path = NULL;
> +	int dir;
> +	int ret;
> +
> +	dir = __igt_params_open(device, save ? &path : NULL);
> +	if (dir < 0)
> +		return false;
> +
> +	if (save)
> +		igt_params_save(dir, path, parameter);
> +
> +	ret = igt_sysfs_vprintf(dir, parameter, fmt, ap);
> +
> +	close(dir);
> +	free(path);
> +
> +	return ret > 0;
> +}
> +
>  /**
>   * igt_params_set:
>   * @device: fd of the device
> @@ -164,20 +187,35 @@ int igt_params_open(int device)
>  bool igt_params_set(int device, const char *parameter, const char *fmt, ...)
>  {
>  	va_list ap;
> -	int dir;
> -	int ret;
> -
> -	dir = igt_params_open(device);
> -	if (dir < 0)
> -		return false;
> +	bool ret;
>  
>  	va_start(ap, fmt);
> -	ret = igt_sysfs_vprintf(dir, parameter, fmt, ap);
> +	ret = __igt_params_set(device, parameter, fmt, ap, false);
>  	va_end(ap);
>  
> -	close(dir);
> +	return ret;
> +}
>  
> -	return ret > 0;
> +/**
> + * igt_params_set_save:
> + * @device: fd of the device (or -1 to default to Intel)


Default to Intel? Which Intel? Where is this defaulting implemented?

-- 
Petri Latvala


> + * @parameter: the name of the parameter to set
> + * @fmt: printf-esque format string
> + *
> + * Save the original value to be restored.
> + *
> + * Returns true on success
> + */
> +bool igt_params_set_save(int device, const char *parameter, const char *fmt, ...)
> +{
> +	va_list ap;
> +	bool ret;
> +
> +	va_start(ap, fmt);
> +	ret = __igt_params_set(device, parameter, fmt, ap, true);
> +	va_end(ap);
> +
> +	return ret;
>  }