linux-kernel - RE: [PATCH 0/4] Enable amd-pstate active mode by default

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Date:   Mon, 5 Jun 2023 16:10:06 +0000
From:   "Yuan, Perry" <Perry.Yuan@....com>
To:     "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Huang, Ray" <Ray.Huang@....com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
CC:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Robert Moore <robert.moore@...el.com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "devel@...ica.org" <devel@...ica.org>,
        "Shenoy, Gautham Ranjal" <gautham.shenoy@....com>,
        "Karny, Wyes" <Wyes.Karny@....com>
Subject: RE: [PATCH 0/4] Enable amd-pstate active mode by default

[AMD Official Use Only - General]

Hi Mario, Rafael,

> -----Original Message-----
> From: Limonciello, Mario <Mario.Limonciello@....com>
> Sent: Monday, June 5, 2023 11:11 PM
> To: Huang, Ray <Ray.Huang@....com>; Srinivas Pandruvada
> <srinivas.pandruvada@...ux.intel.com>
> Cc: Rafael J . Wysocki <rafael@...nel.org>; Len Brown <lenb@...nel.org>;
> Viresh Kumar <viresh.kumar@...aro.org>; Robert Moore
> <robert.moore@...el.com>; linux-acpi@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-pm@...r.kernel.org; devel@...ica.org; Shenoy,
> Gautham Ranjal <gautham.shenoy@....com>; Karny, Wyes
> <Wyes.Karny@....com>; Yuan, Perry <Perry.Yuan@....com>; Limonciello,
> Mario <Mario.Limonciello@....com>
> Subject: [PATCH 0/4] Enable amd-pstate active mode by default
>
> Active mode for amd-pstate has shown enough success now that it makes
> sense to enable it by default on client systems.
>
> This series introduces a new kernel configuration option to set the default
> policy for amd-pstate modes for a kernel.
>
> Server systems will by identified by the PM preferred profile and still be set as
> disabled by default for now.
>
> Mario Limonciello (4):
>   ACPI: CPPC: Add a symbol to check if the preferred profile is a server
>   cpufreq: amd-pstate: Set a fallback policy based on preferred_profile
>   cpufreq: amd-pstate: Add a kernel config option to set default mode
>   cpufreq: intel_pstate: Use the acpi_pm_profile_server() symbol
>
>  drivers/acpi/cppc_acpi.c       | 34 +++++++++++++++
>  drivers/cpufreq/Kconfig.x86    | 17 ++++++++
>  drivers/cpufreq/amd-pstate.c   | 80 ++++++++++++++++++++++------------
>  drivers/cpufreq/intel_pstate.c | 17 +-------
>  include/acpi/actbl.h           |  3 +-
>  include/acpi/processor.h       | 10 +++++
>  include/linux/amd-pstate.h     |  4 +-
>  7 files changed, 121 insertions(+), 44 deletions(-)
>
> --
> 2.34.1


Sorry for the typo, send again.

The series is tested with commit 7736c431466abb54a2679dc257f739fddfa84295 (linux-pm/bleeding-edge)

Default option will enable EPP mode without any parameters added to kernel command line, If user adds "amd_pstate=passive" to kernel command line, they still can choose other modes to use.

Based the testing result.
Tested-by: Yuan Perry <Perry.Yuan@....com>

Perry.