mbox series

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

Message ID 20240901050035.1739935-1-superm1@kernel.org (mailing list archive)
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Series amd-pstate: Better handling for systems without an MSR | expand

Message

Mario Limonciello Sept. 1, 2024, 5 a.m. UTC 
From: Mario Limonciello <mario.limonciello@amd.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(-)