linux-kernel - [PATCH 0/4] CPUFreq statistics retrieved by drivers

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Date:   Wed, 29 Jul 2020 16:12:04 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org
Cc:     sudeep.holla@....com, cristian.marussi@....com,
        viresh.kumar@...aro.org, lukasz.luba@....com, rjw@...ysocki.net
Subject: [PATCH 0/4] CPUFreq statistics retrieved by drivers

Hi all,

The existing CPUFreq framework does not tracks the statistics when the
'fast switch' is used or when firmware changes the frequency independently
due to e.g. thermal reasons. However, the firmware might track the frequency
changes and expose this to the kernel.

This patch set aims to introduce CPUfreq statistics gathered by firmware
and retrieved by CPUFreq driver. It would require a new API functions
in the CPUFreq, which allows to poke drivers to get these stats.

The needed CPUFreq infrastructure is in patch 1/4, patch 2/4 extends
ARM SCMI protocol layer, patches 3/4, 4/4  modify ARM SCMI CPUFreq driver.

Regards,
Lukasz Luba

Lukasz Luba (4):
  cpufreq: Add support for statistics read from drivers
  scmi: perf: Extend protocol to support performance statistics
  cpufreq: scmi: Move scmi_cpufreq_driver structure to the top
  cpufreq: scmi: Read statistics from FW shared memory

 drivers/cpufreq/cpufreq.c        |  22 ++++
 drivers/cpufreq/cpufreq_stats.c  |  38 +++---
 drivers/cpufreq/scmi-cpufreq.c   | 116 ++++++++++++++---
 drivers/firmware/arm_scmi/perf.c | 210 +++++++++++++++++++++++++++++++
 include/linux/cpufreq.h          |  32 +++++
 include/linux/scmi_protocol.h    |  11 ++
 6 files changed, 401 insertions(+), 28 deletions(-)

-- 
2.17.1