[v12,09/11] Documentation: introduce amd pstate active mode kernel command line options
| Message ID | 20230131090016.3970625-10-perry.yuan@amd.com |
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From: Perry Yuan <perry.yuan@amd.com>
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Subject: [PATCH v12 09/11] Documentation: introduce amd pstate active mode
kernel command line options
Date: Tue, 31 Jan 2023 17:00:14 +0800
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Implement AMD Pstate EPP Driver
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Commit Message
Yuan, Perry
Jan. 31, 2023, 9 a.m. UTC
AMD Pstate driver support another firmware based autonomous mode with "amd_pstate=active" added to the kernel command line. In autonomous mode SMU firmware decides frequencies at runtime based on workload utilization, usage in other IPs, infrastructure limits such as power, thermals and so on. Acked-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> Reviewed-by: Wyes Karny <wyes.karny@amd.com> Tested-by: Wyes Karny <wyes.karny@amd.com> Signed-off-by: Perry Yuan <perry.yuan@amd.com> --- Documentation/admin-guide/kernel-parameters.txt | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 6cfa6e3996cf..e3618dfdb36a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -7020,3 +7020,10 @@ management firmware translates the requests into actual hardware states (core frequency, data fabric and memory clocks etc.) + active + Use amd_pstate_epp driver instance as the scaling driver, + 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.