linux-kernel - [PATCH 0/2] amd-pstate: Better handling for systems without an MSR

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Message-ID: <20240901050035.1739935-1-superm1@kernel.org>
Date: Sun,  1 Sep 2024 00:00:33 -0500
From: Mario Limonciello <superm1@...nel.org>
To: "Gautham R . Shenoy" <gautham.shenoy@....com>,
	Perry Yuan <perry.yuan@....com>
Cc: linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	linux-pm@...r.kernel.org (open list:CPU FREQUENCY SCALING FRAMEWORK),
	Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 0/2] amd-pstate: Better handling for systems without an MSR

From: Mario Limonciello <mario.limonciello@....com>

Since the policy changed for amd-pstate to enable on systems
with shared memory designs by default too some users have
reported that software like power-profiles-daemon fails
with an error -524.

This happens because error codes from the CPPC API are ignored
during the initial setup so all the sysfs files are created but
don't work.

This series does two things:
1. Add a debugging early param to force going into shared memory mode
   even on a system with a dedicated MSR.  This will aid in debugging
   reported issues.
2. Catch errors in amd_pstate_epp_update_limit() and pass them up. If
   any errors occurred with CPPC API then amd-pstate won't be setup.

Mario Limonciello (2):
  cpufreq/amd-pstate: Add an early param to disable MSR mode
  cpufreq/amd-pstate: Catch failures for amd_pstate_epp_update_limit()

 .../admin-guide/kernel-parameters.txt         |  5 ++-
 Documentation/admin-guide/pm/amd-pstate.rst   |  5 +++
 drivers/cpufreq/amd-pstate.c                  | 43 +++++++++++++------
 3 files changed, 38 insertions(+), 15 deletions(-)

-- 
2.43.0