linux-kernel - Re: [PATCH v2 1/3] thermal/debugfs: Create records for cdev states as they get used

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Message-ID: <9edd1059-e9ad-466e-a302-8055a44ff56d@arm.com>
Date: Thu, 25 Apr 2024 20:08:09 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v2 1/3] thermal/debugfs: Create records for cdev states as
 they get used



On 4/25/24 15:03, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Because thermal_debug_cdev_state_update() only creates a duration record
> for the old state of a cooling device, if its new state is used for the
> first time, there will be no record for it and cdev_dt_seq_show() will
> not print the duration information for it even though it contains code
> to compute the duration value in that case.
> 
> Address this by making thermal_debug_cdev_state_update() create a
> duration record for the new state if there is none.
> 
> Fixes: 755113d76786 ("thermal/debugfs: Add thermal cooling device debugfs information")
> Reported-by: Lukasz Luba <lukasz.luba@....com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>   drivers/thermal/thermal_debugfs.c |    8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> Index: linux-pm/drivers/thermal/thermal_debugfs.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_debugfs.c
> +++ linux-pm/drivers/thermal/thermal_debugfs.c
> @@ -433,6 +433,14 @@ void thermal_debug_cdev_state_update(con
>   	}
>   
>   	cdev_dbg->current_state = new_state;
> +
> +	/*
> +	 * Create a record for the new state if it is not there, so its
> +	 * duration will be printed by cdev_dt_seq_show() as expected if it
> +	 * runs before the next state transition.
> +	 */
> +	thermal_debugfs_cdev_record_get(thermal_dbg, cdev_dbg->durations, new_state);
> +
>   	transition = (old_state << 16) | new_state;
>   
>   	/*
> 
> 
> 
> 

Reviewed-by: Lukasz Luba <lukasz.luba@....com>