From: Wyes Karny <wyes.karny@amd.com>
To: Perry Yuan <perry.yuan@amd.com>
Cc: Deepak.Sharma@amd.com, Nathan.Fontenot@amd.com,
Alexander.Deucher@amd.com, Shimmer.Huang@amd.com,
Xiaojian.Du@amd.com, Li.Meng@amd.com, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org, rafael.j.wysocki@intel.com,
Mario.Limonciello@amd.com, ray.huang@amd.com,
viresh.kumar@linaro.org
Subject: Re: [PATCH v11 08/11] Documentation: amd-pstate: add amd pstate driver mode introduction
Date: Thu, 19 Jan 2023 11:02:11 +0530 [thread overview]
Message-ID: <336b70ac-ac93-26ec-a09b-aeca0300d45c@amd.com> (raw)
In-Reply-To: <20230118075210.447418-9-perry.yuan@amd.com>
On 1/18/2023 1:22 PM, Perry Yuan wrote:
> From: Perry Yuan <Perry.Yuan@amd.com>
>
> The amd-pstate driver has two operation modes supported:
> * CPPC Autonomous (active) mode
> * CPPC non-autonomous (passive) mode.
> active mode and passive mode can be chosen by different kernel parameters.
>
> Acked-by: Huang Rui <ray.huang@amd.com>
> Tested-by: Wyes Karny <wyes.karny@amd.com>
> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
> Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
Reviewed-by: Wyes Karny <wyes.karny@amd.com>
> ---
> Documentation/admin-guide/pm/amd-pstate.rst | 26 +++++++++++++++++++--
> 1 file changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
> index 98a2bb44f80c..b6aee69f564f 100644
> --- a/Documentation/admin-guide/pm/amd-pstate.rst
> +++ b/Documentation/admin-guide/pm/amd-pstate.rst
> @@ -299,8 +299,30 @@ module which supports the new AMD P-States mechanism on most of the future AMD
> platforms. The AMD P-States mechanism is the more performance and energy
> efficiency frequency management method on AMD processors.
>
> -Kernel Module Options for ``amd-pstate``
> -=========================================
> +
> +AMD Pstate Driver Operation Modes
> +=================================
> +
> +``amd_pstate`` CPPC has two operation modes: CPPC Autonomous(active) mode and
> +CPPC non-autonomous(passive) mode.
> +active mode and passive mode can be chosen by different kernel parameters.
> +When in Autonomous mode, CPPC ignores requests done in the Desired Performance
> +Target register and takes into account only the values set to the Minimum requested
> +performance, Maximum requested performance, and Energy Performance Preference
> +registers. When Autonomous is disabled, it only considers the Desired Performance Target.
> +
> +Active Mode
> +------------
> +
> +``amd_pstate=active``
> +
> +This is the low-level firmware control mode which is implemented by ``amd_pstate_epp``
> +driver with ``amd_pstate=active`` passed to the kernel in the command line.
> +In this mode, ``amd_pstate_epp`` driver provides a hint to the hardware if software
> +wants to bias toward performance (0x0) or energy efficiency (0xff) to the CPPC firmware.
> +then CPPC power algorithm will calculate the runtime workload and adjust the realtime
> +cores frequency according to the power supply and thermal, core voltage and some other
> +hardware conditions.
>
> Passive Mode
> ------------
--
Thanks & Regards,
Wyes
next prev parent reply other threads:[~2023-01-19 5:32 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-18 7:51 [PATCH v11 00/11] Implement AMD Pstate EPP Driver Perry Yuan
2023-01-18 7:52 ` [PATCH v11 01/11] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2023-01-18 7:52 ` [PATCH v11 02/11] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2023-01-19 5:17 ` Wyes Karny
2023-01-18 7:52 ` [PATCH v11 03/11] cpufreq: amd-pstate: optimize driver working mode selection in amd_pstate_param() Perry Yuan
2023-01-18 7:52 ` [PATCH v11 04/11] cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2023-01-18 15:47 ` kernel test robot
2023-01-19 2:45 ` Huang Rui
2023-01-19 5:17 ` Wyes Karny
2023-01-18 7:52 ` [PATCH v11 05/11] cpufreq: amd-pstate: implement amd pstate cpu online and offline callback Perry Yuan
2023-01-19 5:27 ` Wyes Karny
2023-01-18 7:52 ` [PATCH v11 06/11] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2023-01-19 5:31 ` Wyes Karny
2023-01-18 7:52 ` [PATCH v11 07/11] cpufreq: amd-pstate: add driver working mode switch support Perry Yuan
2023-01-18 7:52 ` [PATCH v11 08/11] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2023-01-19 5:32 ` Wyes Karny [this message]
2023-01-18 7:52 ` [PATCH v11 09/11] Documentation: introduce amd pstate active mode kernel command line options Perry Yuan
2023-01-19 5:32 ` Wyes Karny
2023-01-18 7:52 ` [PATCH v11 10/11] cpufreq: amd-pstate: convert sprintf with sysfs_emit() Perry Yuan
2023-01-19 5:33 ` Wyes Karny
2023-01-18 7:52 ` [PATCH v11 11/11] Documentation: amd-pstate: introduce new global sysfs attributes Perry Yuan
2023-01-19 5:33 ` Wyes Karny
2023-01-19 2:50 ` [PATCH v11 00/11] Implement AMD Pstate EPP Driver Huang Rui
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