linux-kernel - Re: [PATCH 3/3] Create debugfs files for statistics

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Date: Mon, 1 Jul 2024 17:19:58 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: Luke Parkin <luke.parkin@....com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	arm-scmi@...r.kernel.org, sudeep.holla@....com,
	cristian.marussi@....com
Subject: Re: [PATCH 3/3] Create debugfs files for statistics

On Mon, Jul 01, 2024 at 03:28:51PM +0100, Luke Parkin wrote:
> Create debugfs files for the statistics in the scmi_debug_stats struct
> 
> Signed-off-by: Luke Parkin <luke.parkin@....com>
> ---
>  drivers/firmware/arm_scmi/driver.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index f69dff699d48..509ea42d17bf 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -2884,7 +2884,7 @@ static void scmi_debugfs_common_cleanup(void *d)
>  static struct scmi_debug_info *scmi_debugfs_common_setup(struct scmi_info *info)
>  {
>  	char top_dir[16];
> -	struct dentry *trans, *top_dentry;
> +	struct dentry *trans, *top_dentry, *stats;

stats are conditional...so...

>  	struct scmi_debug_info *dbg;
>  	const char *c_ptr = NULL;
>  
> @@ -2935,6 +2935,19 @@ static struct scmi_debug_info *scmi_debugfs_common_setup(struct scmi_info *info)
>  	debugfs_create_u32("rx_max_msg", 0400, trans,
>  			   (u32 *)&info->rx_minfo.max_msg);
>  
> +	if (IS_ENABLED(CONFIG_ARM_SCMI_DEBUG_STATISTICS)) {
> +		stats = debugfs_create_dir("stats", trans);

you can put the above local *stats var instead so that it is NOT even
defined when STATS=n

> +		debugfs_create_atomic_t("response_ok", 0400, stats,
> +					&info->stats.response_ok);
> +		debugfs_create_atomic_t("dlyd_response_ok", 0400, stats,
> +					&info->stats.dlyd_response_ok);
> +		debugfs_create_atomic_t("sent_ok", 0400, stats,
> +					&info->stats.sent_ok);
> +		debugfs_create_atomic_t("sent_fail", 0400, stats,
> +					&info->stats.sent_fail);
> +		debugfs_create_atomic_t("xfers_response_timeout", 0400, stats,
> +					&info->stats.xfers_response_timeout);
> +	}

... moreover...this is not always enabled BUT certainly will be extend
sooner with more counters...so please split this setup out in a local helper
function.

Thanks,
Cristian