linux-kernel - Re: [PATCH 6/7] thermal: netlink: Add a new event to notify CPU capabilities change

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Message-ID: <b51c9b2a-40d2-6575-7746-3059eec53519@linaro.org>
Date:   Tue, 30 Nov 2021 10:29:46 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-pm@...r.kernel.org
Cc:     x86@...nel.org, linux-doc@...r.kernel.org,
        Len Brown <len.brown@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Amit Kucheria <amitk@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] thermal: netlink: Add a new event to notify CPU
 capabilities change

On 06/11/2021 02:33, Ricardo Neri wrote:
> From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> 
> Add a new netlink event to notify change in CPU capabilities in terms of
> performance and efficiency.
> 
> Firmware may change CPU capabilities as a result of thermal events in the
> system or to account for changes in the TDP (thermal design power) level.
> 
> This notification type will allow user space to avoid running workloads
> on certain CPUs or proactively adjust power limits to avoid future events.
> 

[ ... ]

> +	[THERMAL_GENL_ATTR_CPU_CAPABILITY_ID]	= { .type = NLA_U32 },
> +	[THERMAL_GENL_ATTR_CPU_CAPABILITY_PERF]	= { .type = NLA_U32 },
> +	[THERMAL_GENL_ATTR_CPU_CAPABILITY_EFF]	= { .type = NLA_U32 },
>  };

AFAIU, 0 <= perf < 256 and 0 <= eff < 256, right?

Is the following true?

	0 <= perf + eff < 256



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