linux-kernel - Re: [PATCH v3 0/6] amd_pstate: Add guided autonomous mode support

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Date:   Tue, 31 Jan 2023 05:34:27 +0000
From:   Wyes Karny <wyes.karny@....com>
To:     Tor Vic <torvic9@...lbox.org>
Cc:     Rafael J Wysocki <rafael@...nel.org>,
        Huang Rui <ray.huang@....com>,
        Jonathan Corbet <corbet@....net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Mario.Limonciello@....com, Perry.Yuan@....com,
        Ananth Narayan <ananth.narayan@....com>,
        gautham.shenoy@....com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Bagas Sanjaya <bagasdotme@...il.com>, santosh.shukla@....com,
        Len Brown <lenb@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH v3 0/6] amd_pstate: Add guided autonomous mode support

Hi Tor Vic,

On 24 Jan 20:40, Tor Vic wrote:
--------------------------------->8----------------------------- 
> 
> The "active" mode seems to be broken here on a Zen2 3900X running Linux 6.1.
> Frequency remains stuck at minimum which is +-500 MHz.

I've fixed this in v4.

> 
> Some queries of the new /sys devices lead to I/O error:
> 
>   # LANG=C cat /sys/devices/system/cpu/cpufreq/policy0/amd_pstate_*
>   166
>   cat:
> /sys/devices/system/cpu/cpufreq/policy0/amd_pstate_lowest_nonlinear_freq:
> Input/output error
>   cat: /sys/devices/system/cpu/cpufreq/policy0/amd_pstate_max_freq:
> Input/output error
> 
This issue I'm not able to reproduce. Is this issue seen with only EPP
patches also?
Could you please check if this issue still there with v4?

Thanks,
Wyes

> The "guided" mode seems to work fine with no stuck frequency, but also
> produces I/O error on some /sys files.
> 
> I haven't tested "passive".
> 
> Cheers,
> 
> Tor Vic