linux-kernel - [PATCH v2 0/4] Energy Model power in micro-Watts and SCMI v3.1 alignment

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Date:   Thu,  7 Jul 2022 08:15:51 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     daniel.lezcano@...aro.org, amitk@...nel.org, rui.zhang@...el.com,
        lukasz.luba@....com, viresh.kumar@...aro.org, rafael@...nel.org,
        dietmar.eggemann@....com, nm@...com, sboyd@...nel.org,
        sudeep.holla@....com, cristian.marussi@....com,
        matthias.bgg@...il.com, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 0/4] Energy Model power in micro-Watts and SCMI v3.1 alignment

Hi all,

This is a patch set which changes Energy Model power values scale to
micro-Watts. It also upgrades the SCMI performance layer + scmi-cpufreq
driver to leverage the SCMI v3.1 spec and process micro-Watts power values
coming from FW. The higher precision in EM power field solves an issue
of a rounding error, which then can be misinterpreted as 'inefficient OPP'.
An example rounding issue calculation is present in patch 1/4 description.

Changes:
v2
- simplified 32bit checks for max number of CPUs preventing energy
  estimation overflow
- added Reviewed-by and ACKs
v1 [1]

Regards,
Lukasz Luba

[1] https://lore.kernel.org/lkml/20220622145802.13032-1-lukasz.luba@arm.com/

Lukasz Luba (4):
  PM: EM: convert power field to micro-Watts precision and align drivers
  Documentation: EM: Switch to micro-Watts scale
  firmware: arm_scmi: Get detailed power scale from perf
  cpufreq: scmi: Support the power scale in micro-Watts in SCMI v3.1

 Documentation/power/energy-model.rst  | 14 +++----
 drivers/cpufreq/mediatek-cpufreq-hw.c |  7 ++--
 drivers/cpufreq/scmi-cpufreq.c        | 15 +++++++-
 drivers/firmware/arm_scmi/perf.c      | 18 +++++----
 drivers/opp/of.c                      | 15 ++++----
 drivers/powercap/dtpm_cpu.c           |  5 +--
 drivers/thermal/cpufreq_cooling.c     | 13 ++++++-
 drivers/thermal/devfreq_cooling.c     | 19 ++++++++--
 include/linux/energy_model.h          | 54 +++++++++++++++++++--------
 include/linux/scmi_protocol.h         |  8 +++-
 kernel/power/energy_model.c           | 24 ++++++++----
 11 files changed, 132 insertions(+), 60 deletions(-)

-- 
2.17.1