linux-kernel - [RFC V2 0/2] cpufreq: cppc: Add support for frequency invariance

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Message-Id: <cover.1608030508.git.viresh.kumar@linaro.org>
Date:   Tue, 15 Dec 2020 16:46:34 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rafael Wysocki <rjw@...ysocki.net>,
        Ionela Voinescu <ionela.voinescu@....com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Peter Puhov <peter.puhov@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC V2 0/2] cpufreq: cppc: Add support for frequency invariance

Hello,

CPPC cpufreq driver is used for ARM servers and this patch series tries
to provide frequency invariance support for them.

This is tested with some hacks, as I didn't have access to the right
hardware, on the ARM64 hikey board to check the overall functionality
and that works fine.

Ionela/Peter Puhov, it would be nice if you guys can give this a shot.

This is based of pm/linux-next and patches [1] and [2] which I sent
recently to cleanup arm64 topology stuff.

Changes since V1:
- The interface for setting the callbacks is improved, so different
  parts looking to provide their callbacks don't need to think about
  each other.

- Moved to per-cpu storage for storing the callback related data, AMU
  counters have higher priority with this.

--
viresh

[1] https://lore.kernel.org/lkml/7a171f710cdc0f808a2bfbd7db839c0d265527e7.1607579234.git.viresh.kumar@linaro.org/
[2] https://lore.kernel.org/lkml/5ffc7b9ed03c6301ac2f710f609282959491b526.1608010334.git.viresh.kumar@linaro.org/

Viresh Kumar (2):
  topology: Allow multiple entities to provide sched_freq_tick()
    callback
  cpufreq: cppc: Add support for frequency invariance

 arch/arm64/include/asm/topology.h |   8 +-
 arch/arm64/kernel/topology.c      |  89 +++++++++----------
 drivers/base/arch_topology.c      |  56 +++++++++++-
 drivers/cpufreq/cppc_cpufreq.c    | 140 +++++++++++++++++++++++++++++-
 include/linux/arch_topology.h     |  14 ++-
 kernel/sched/core.c               |   1 +
 6 files changed, 244 insertions(+), 64 deletions(-)

-- 
2.25.0.rc1.19.g042ed3e048af