linux-kernel - Re: [PATCH v1 05/16] thermal: core: Introduce .manage() callback for thermal governors

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Message-ID: <d949f374-fd54-4f6b-9d15-6cc35b1f226e@arm.com>
Date: Fri, 19 Apr 2024 10:44:09 +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>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH v1 05/16] thermal: core: Introduce .manage() callback for
 thermal governors



On 4/10/24 17:08, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Introduce a new thermal governor callback called .manage() that will be
> invoked once per thermal zone update after processing all of the trip
> points in the core.
> 
> This will allow governors that look at multiple trip points together
> to check all of them in a consistent configuration, so they don't need
> to play tricks with skipping .throttle() invocations that they are not
> interested in and they can avoid carrying out the same computations for
> multiple times in one cycle.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>   drivers/thermal/thermal_core.c |    3 +++
>   drivers/thermal/thermal_core.h |    2 ++
>   2 files changed, 5 insertions(+)
> 
> Index: linux-pm/drivers/thermal/thermal_core.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_core.c
> +++ linux-pm/drivers/thermal/thermal_core.c
> @@ -516,6 +516,9 @@ void __thermal_zone_device_update(struct
>   			governor->trip_crossed(tz, &td->trip, false);
>   	}
>   
> +	if (governor->manage)
> +		governor->manage(tz);
> +
>   	monitor_thermal_zone(tz);
>   }
>   
> Index: linux-pm/drivers/thermal/thermal_core.h
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_core.h
> +++ linux-pm/drivers/thermal/thermal_core.h
> @@ -31,6 +31,7 @@ struct thermal_trip_desc {
>    * @unbind_from_tz:	callback called when a governor is unbound from a
>    *			thermal zone.
>    * @trip_crossed:	called for trip points that have just been crossed
> + * @manage:	called on thermal zone temperature updates
>    * @throttle:	callback called for every trip point even if temperature is
>    *		below the trip point temperature
>    * @update_tz:	callback called when thermal zone internals have changed, e.g.
> @@ -44,6 +45,7 @@ struct thermal_governor {
>   	void (*trip_crossed)(struct thermal_zone_device *tz,
>   			     const struct thermal_trip *trip,
>   			     bool crossed_up);
> +	void (*manage)(struct thermal_zone_device *tz);
>   	int (*throttle)(struct thermal_zone_device *tz,
>   			const struct thermal_trip *trip);
>   	void (*update_tz)(struct thermal_zone_device *tz,
> 
> 
> 

LGTM

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