linux-kernel - [PATCH v3 0/6] Improve usability for amd-pstate

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Message-ID: <20220414164801.1051-1-mario.limonciello@amd.com>
Date:   Thu, 14 Apr 2022 11:47:55 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Rui Huang <ray.huang@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
CC:     "open list:AMD PSTATE DRIVER" <linux-pm@...r.kernel.org>,
        Perry Yuan <Perry.Yuan@....com>,
        open list <linux-kernel@...r.kernel.org>,
        "Mario Limonciello" <mario.limonciello@....com>
Subject: [PATCH v3 0/6] Improve usability for amd-pstate

There has recently been some news coverage about `amd-pstate` being in
5.17, but this news also mentioned that it's a bit difficult to use.

You need to either block init calls, or compile the module into the kernel
to force it to take precedence over acpi-cpufreq.

This series aims to improve the usability of amd-pstate so that distros
can compile as a module, but users can still use it (relatively) easily.

A new module parameter is included that will force amd-pstate to take
precedence and a module table to let it load automatically on such
systems.

By default with this series it will replace acpi-cpufreq no matter the
module load order.  If users want to prefer acpi-cpufreq when amd-pstate
is a module they can make a modprobe configuration file.

/etc/modprobe.d/amd-pstate.conf:

options amd-pstate replace=0

Mario Limonciello (6):
  cpufreq: Export acpu_cpufreq_exit for other drivers to call
  cpufreq: amd-pstate: Only show shared memory solution message once
  cpufreq: amd-pstate: Move cpufreq driver check later
  cpufreq: amd-pstate: Allow replacing acpi-cpufreq when loaded
  cpufreq: amd-pstate: Add a module device table
  cpufreq: amd-pstate: Default to replace acpi-cpufreq

 drivers/cpufreq/acpi-cpufreq.c | 10 +++++++--
 drivers/cpufreq/amd-pstate.c   | 39 +++++++++++++++++++++++++++++-----
 include/linux/cpufreq.h        |  3 +++
 3 files changed, 45 insertions(+), 7 deletions(-)

-- 
2.34.1