From: Perry Yuan <perry.yuan@amd.com>
To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>,
<ray.huang@amd.com>, <viresh.kumar@linaro.org>
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>, <wyes.karny@amd.com>,
<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v5 9/9] Documentation: introduce amd pstate active mode kernel command line options
Date: Tue, 29 Nov 2022 01:03:14 +0800 [thread overview]
Message-ID: <20221128170314.2276636-10-perry.yuan@amd.com> (raw)
In-Reply-To: <20221128170314.2276636-1-perry.yuan@amd.com>
AMD Pstate driver support another fimware based autonomous mode
with "amd_pstate=active" added to the kernel command line.
In autonomous mode SMU firmware decides frequencies at 1 ms timescale
based on workload utilization, usage in other IPs, infrastructure
limits such as power, thermals and so on.
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..8fa0d45add03 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 instace 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.
--
2.34.1
next prev parent reply other threads:[~2022-11-28 17:10 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-28 17:03 [PATCH v5 0/9] Implement AMD Pstate EPP Driver Perry Yuan
2022-11-28 17:03 ` [PATCH v5 1/9] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2022-11-28 17:03 ` [PATCH v5 2/9] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2022-11-28 17:03 ` [PATCH v5 3/9] cpufreq: amd_pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2022-11-29 11:23 ` kernel test robot
2022-11-29 12:48 ` Wyes Karny
2022-12-02 7:49 ` Yuan, Perry
2022-11-30 0:50 ` kernel test robot
2022-11-28 17:03 ` [PATCH v5 4/9] cpufreq: amd_pstate: implement amd pstate cpu online and offline callback Perry Yuan
2022-11-28 17:03 ` [PATCH v5 5/9] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2022-11-28 17:03 ` [PATCH v5 6/9] cpufreq: amd-pstate: add frequency dynamic boost sysfs control Perry Yuan
2022-11-28 17:03 ` [PATCH v5 7/9] cpufreq: amd_pstate: add driver working mode status sysfs entry Perry Yuan
2022-11-28 17:03 ` [PATCH v5 8/9] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2022-11-28 17:03 ` Perry Yuan [this message]
2022-11-29 19:19 ` [PATCH v5 0/9] Implement AMD Pstate EPP Driver Tor Vic
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20221128170314.2276636-10-perry.yuan@amd.com \
--to=perry.yuan@amd.com \
--cc=Alexander.Deucher@amd.com \
--cc=Deepak.Sharma@amd.com \
--cc=Li.Meng@amd.com \
--cc=Mario.Limonciello@amd.com \
--cc=Nathan.Fontenot@amd.com \
--cc=Shimmer.Huang@amd.com \
--cc=Xiaojian.Du@amd.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=rafael.j.wysocki@intel.com \
--cc=ray.huang@amd.com \
--cc=viresh.kumar@linaro.org \
--cc=wyes.karny@amd.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).