[v9,11/13] Documentation: introduce amd pstate active mode kernel command line options
| Message ID | 20221225163442.2205660-12-perry.yuan@amd.com |
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From: Perry Yuan <perry.yuan@amd.com>
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Subject: [PATCH v9 11/13] Documentation: introduce amd pstate active mode
kernel command line options
Date: Mon, 26 Dec 2022 00:34:40 +0800
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Implement AMD Pstate EPP Driver
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Commit Message
Yuan, Perry
Dec. 25, 2022, 4:34 p.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. Reviewed-by: Mario Limonciello <mario.limonciello@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 42af9ca0127e..73a02816f6f8 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6970,3 +6970,10 @@ 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.