linux-kernel - Re: [RFC][PATCH 1/2] cpufreq: Add special-purpose fast-switching callback for drivers

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Message-ID: <20201207074615.kmvy5afoolhv5cgq@vireshk-i7>
Date:   Mon, 7 Dec 2020 13:16:15 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Doug Smythies <dsmythies@...us.net>,
        Giovanni Gherdovich <ggherdovich@...e.com>
Subject: Re: [RFC][PATCH 1/2] cpufreq: Add special-purpose fast-switching
 callback for drivers

On 30-11-20, 19:37, Rafael J. Wysocki wrote:
> Index: linux-pm/include/linux/cpufreq.h
> ===================================================================
> --- linux-pm.orig/include/linux/cpufreq.h
> +++ linux-pm/include/linux/cpufreq.h
> @@ -320,6 +320,15 @@ struct cpufreq_driver {
>  					unsigned int index);
>  	unsigned int	(*fast_switch)(struct cpufreq_policy *policy,
>  				       unsigned int target_freq);
> +	/*
> +	 * ->fast_switch() replacement for drivers that use an internal
> +	 * representation of performance levels and can pass hints other than
> +	 * the target performance level to the hardware.
> +	 */
> +	void		(*adjust_perf)(unsigned int cpu, bool busy,

Maybe this should still take policy as an argument (like other calls)
instead of CPU, even if it is going to be used for single-cpu per
policy case for now.

> +				       unsigned long min_perf,
> +				       unsigned long target_perf,
> +				       unsigned long capacity);

-- 
viresh