linux-kernel - Re: [PATCH] cpufreq: CPPC: Support for autonomous selection in cppc

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Message-ID: <20250519081850.7ycbcw56jzpiwkth@vireshk-i7>
Date: Mon, 19 May 2025 13:48:50 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Lifeng Zheng <zhenglifeng1@...wei.com>
Cc: rafael@...nel.org, pierre.gondois@....com, sumitg@...dia.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linuxarm@...wei.com, mario.limonciello@....com,
	yumpusamongus@...il.com, srinivas.pandruvada@...ux.intel.com,
	jonathan.cameron@...wei.com, zhanjie9@...ilicon.com,
	lihuisong@...wei.com, cenxinghai@...artners.com,
	yubowen8@...wei.com, hepeng68@...wei.com
Subject: Re: [PATCH] cpufreq: CPPC: Support for autonomous selection in
 cppc_cpufreq

On 07-05-25, 11:19, Lifeng Zheng wrote:
> Add sysfs interfaces for CPPC autonomous selection in the cppc_cpufreq
> driver.
> 
> Signed-off-by: Lifeng Zheng <zhenglifeng1@...wei.com>

Sumit, can you provide your tag if it looks fine to you ?

> diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
> index 206079d3bd5b..37065e1b8ebc 100644
> --- a/Documentation/ABI/testing/sysfs-devices-system-cpu
> +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
> @@ -268,6 +268,60 @@ Description:	Discover CPUs in the same CPU frequency coordination domain
>  		This file is only present if the acpi-cpufreq or the cppc-cpufreq
>  		drivers are in use.
>  
> +What:		/sys/devices/system/cpu/cpuX/cpufreq/auto_select

Is the path correct? Should this be cpufreq/policyN/auto_select ?

> diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
> index b3d74f9adcf0..3c3d00cec298 100644
> --- a/drivers/cpufreq/cppc_cpufreq.c
> +++ b/drivers/cpufreq/cppc_cpufreq.c
> @@ -808,10 +808,119 @@ static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
>  
>  	return cpufreq_show_cpus(cpu_data->shared_cpu_map, buf);
>  }
> +
> +static ssize_t show_auto_select(struct cpufreq_policy *policy, char *buf)
> +{
> +	bool val;
> +	int ret;
> +
> +	ret = cppc_get_auto_sel(policy->cpu, &val);
> +
> +	/* show "<unsupported>" when this register is not supported by cpc */

s/cpc/cppc/ ?

-- 
viresh