linux-kernel - Re: [PATCH 00/18] ARM/ARM64: Support hierarchical CPU arrangement for PSCI

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Message-ID: <CAPDyKFo6Hkw=6iAq8fCEKARXeOiFp9C8FrJ4D_r0PoDFASSDRg@mail.gmail.com>
Date:   Fri, 7 Jun 2019 13:19:22 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Raju P . L . S . S . S . N" <rplsssn@...eaurora.org>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        Tony Lindgren <tony@...mide.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Kevin Hilman <khilman@...nel.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Souvik Chakravarty <souvik.chakravarty@....com>,
        Linux PM <linux-pm@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/18] ARM/ARM64: Support hierarchical CPU arrangement for PSCI

Sudeep, Lorenzo, Mark,

On Mon, 13 May 2019 at 21:23, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> This series enables support for hierarchical CPU arrangement, managed by PSCI
> for ARM/ARM64. It's based on using the generic PM domain (genpd), which
> recently was extended to manage devices belonging to CPUs.
>
> The last two DTS patches enables the hierarchical topology to be used for the
> Qcom 410c Dragonboard and the Hisilicon Hikey board. The former uses PSCI OS-
> initiated mode, while the latter uses the PSCI Platform-Coordinated mode. In
> other words, the hierarchical description of the topology in DT, is orthogonal
> to the supported PSCI CPU suspend mode.
>
> Do note, these patches have been posted earlier, but then being part of bigger
> series, which at that point also included the needed infrastructure changes to
> genpd and cpuidle. Rather than continue to carry the old version history,
> which may be a bit confusing, I decided to start over. Although, for clarity,
> the changelog below explains what changes that have been made since the last
> submission was made.

Is there anything I can do to help the review to get going here?

FYI, I hosted a talk about "cluster idle" at OSPM in Pisa a few weeks
ago. There is a couple of slides [1] with flowcharts of how it works,
that may be of interest for you.

Kind regards
Uffe

[...]

[1]
http://retis.sssup.it/ospm-summit/Downloads/01_02-ClusterIdle_UlfHansson.pdf