linux-kernel - Re: [PATCH 0/8] cppc_cpufreq: fix, clarify and improve support

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Date:   Tue, 17 Nov 2020 17:30:33 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ionela Voinescu <ionela.voinescu@....com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Len Brown <lenb@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Jeremy Linton <jeremy.linton@....com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/8] cppc_cpufreq: fix, clarify and improve support

On Tue, Nov 17, 2020 at 4:32 PM Ionela Voinescu <ionela.voinescu@....com> wrote:
>
> Hi Rafael,
>
> On Tuesday 17 Nov 2020 at 15:59:24 (+0100), Rafael J. Wysocki wrote:
> > On Thu, Nov 5, 2020 at 1:56 PM Ionela Voinescu <ionela.voinescu@....com> wrote:
> > >
> > > Hi guys,
> > >
> > > I found myself staring a bit too much at this driver in the past weeks
> > > and that's likely the cause for me coming up with this series of 8
> > > patches that cleans up, clarifies and reworks parts of it, as follows:
> > >
> > >  - patches 1-3/8: trivial clean-up and renaming with the purpose to
> > >                   improve readability
> > >  - patch 4/8: replace previous per-cpu data structures with lists of
> > >               domains and CPUs to get more efficient storage for driver
> > >               data and fix previous issues in case of CPU hotplugging,
> > >               as discussed at [1].
> > >  - patches 5-6/8: a few fixes and clarifications: mostly making sure
> > >                   the behavior described in the comments and debug
> > >                   messages matches the code and there is clear
> > >                   indication of what is supported and how.
> > >  - patch 7/8: use the existing freqdomains_cpus attribute to inform
> > >               the user on frequency domains.
> > >  - patch 8/8: acpi: replace ALL coordination with NONE coordination
> > >                     when errors are find parsing the _PSD domains
> > >               (as described in the comments in the code).
> > >
> > > Hopefully you'll find this useful for ease of maintenance and ease of
> > > future development of the driver.
> > >
> > > This functionality was tested on a Juno platform with modified _PSD
> > > tables to test the functionality for all currently supported
> > > coordination types: ANY, HW, NONE.
> > >
> > > The current code is based on v5.10-rc2.
> > >
> > > Thanks,
> > > Ionela.
> > >
> > > [1] https://lore.kernel.org/linux-pm/20200922162540.GB796@arm.com/
> > >
> > > Ionela Voinescu (8):
> > >   cppc_cpufreq: fix misspelling, code style and readability issues
> > >   cppc_cpufreq: clean up cpu, cpu_num and cpunum variable use
> > >   cppc_cpufreq: simplify use of performance capabilities
> > >   cppc_cpufreq: replace per-cpu structures with lists
> > >   cppc_cpufreq: use policy->cpu as driver of frequency setting
> > >   cppc_cpufreq: clarify support for coordination types
> > >   cppc_cpufreq: expose information on frequency domains
> > >   acpi: fix NONE coordination for domain mapping failure
> > >
> > >  .../ABI/testing/sysfs-devices-system-cpu      |   3 +-
> > >  drivers/acpi/cppc_acpi.c                      | 126 +++---
> > >  drivers/acpi/processor_perflib.c              |   2 +-
> > >  drivers/cpufreq/cppc_cpufreq.c                | 358 +++++++++++-------
> > >  include/acpi/cppc_acpi.h                      |  14 +-
> > >  5 files changed, 277 insertions(+), 226 deletions(-)
> > >
> > > --
> >
> > All patches applied as 5.11 material (with a minor subject edit in the
> > last patch), thanks!
> >
>
> Patch 4/8 was not acked. I was about to push a new version in which I
> fix the scenario that Jeremy mentioned.

Well, it wasn't clear to me what you wanted to do about it.

> Would you like me to push that
> as a separate patch on top of this series,

Yes, please.