linux-kernel - [PATCH 0/2][v2] Get percpu max freq via HWP MSR register

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Message-Id: <cover.1610338353.git.yu.c.chen@intel.com>
Date:   Mon, 11 Jan 2021 15:43:07 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhang Rui <rui.zhang@...el.com>,
        Wendy Wang <wendy.wang@...el.com>,
        Chen Yu <yu.c.chen@...el.com>
Subject: [PATCH 0/2][v2] Get percpu max freq via HWP MSR register

Asymmetric platforms might have different max cpu frequency between
small and big cores. Currently the intel_pstate driver uses package wide MSR
register that can not distinguish max cpu frequency between small and big cores
when turbo is disabled, which causes inconsistency compared to the scenario when
turbo mode is enabled. This patch changes the logic from package wide MSR register
to percpu HWP register so as to avoid this issue.

This path is based on Rafael's previous patchset to clean up the intel_pstate_get_hwp_max()
https://patchwork.kernel.org/project/linux-pm/patch/2241039.bdjsIDbar3@kreacher/


Chen Yu (2):
  cpufreq: intel_pstate: Add parameter to get guarantee
  cpufreq: intel_pstate: Get percpu max freq via HWP MSR register if
    available

 drivers/cpufreq/intel_pstate.c | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

-- 
2.17.1