Re: [PATCH v6 00/21] Introduce power-off+restart call chain API
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- To: Dmitry Osipenko <digetx@xxxxxxxxx>
- Subject: Re: [PATCH v6 00/21] Introduce power-off+restart call chain API
- From: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
- Date: Wed, 16 Feb 2022 13:25:39 +0100
- Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, linux-csky@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-m68k@xxxxxxxxxxxxxxx, "open list:BROADCOM NVRAM DRIVER" <linux-mips@xxxxxxxxxxxxxxx>, linux-parisc@xxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, Linux-sh list <linux-sh@xxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, ACPI Devel Maling List <linux-acpi@xxxxxxxxxxxxxxx>, Linux PM <linux-pm@xxxxxxxxxxxxxxx>, linux-tegra <linux-tegra@xxxxxxxxxxxxxxx>, Thierry Reding <thierry.reding@xxxxxxxxx>, Jonathan Hunter <jonathanh@xxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Guo Ren <guoren@xxxxxxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Greg Ungerer <gerg@xxxxxxxxxxxxxx>, Joshua Thompson <funaho@xxxxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, Sebastian Reichel <sre@xxxxxxxxxx>, Linus Walleij <linus.walleij@xxxxxxxxxx>, Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>, Greentime Hu <green.hu@xxxxxxxxx>, Vincent Chen <deanbo422@xxxxxxxxx>, "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Albert Ou <aou@xxxxxxxxxxxxxxxxx>, Yoshinori Sato <ysato@xxxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "the arch/x86 maintainers" <x86@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Len Brown <lenb@xxxxxxxxxx>, Santosh Shilimkar <ssantosh@xxxxxxxxxx>, Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>, Liam Girdwood <lgirdwood@xxxxxxxxx>, Mark Brown <broonie@xxxxxxxxxx>, Pavel Machek <pavel@xxxxxx>, Lee Jones <lee.jones@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Guenter Roeck <linux@xxxxxxxxxxxx>, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>, Ulf Hansson <ulf.hansson@xxxxxxxxxx>, alankao@xxxxxxxxxxxxx, "K . C . Kuen-Chern Lin" <kclin@xxxxxxxxxxxxx>, Michał Mirosław <mirq-linux@xxxxxxxxxxxx>
- In-reply-to: <635e8121-fca4-580c-6af5-d9317a2eee1b@gmail.com>
- References: <20220130233718.21544-1-digetx@gmail.com> <635e8121-fca4-580c-6af5-d9317a2eee1b@gmail.com>
On Tue, Feb 15, 2022 at 11:00 PM Dmitry Osipenko <digetx@xxxxxxxxx> wrote:
>
> 31.01.2022 02:36, Dmitry Osipenko пишет:
> > Problem
> > -------
> >
> > SoC devices require power-off call chaining functionality from kernel.
> > We have a widely used restart chaining provided by restart notifier API,
> > but nothing for power-off.
> >
> > Solution
> > --------
> >
> > Introduce new API that provides both restart and power-off call chains.
> >
> > Why combine restart with power-off? Because drivers often do both.
> > More practical to have API that provides both under the same roof.
> >
> > The new API is designed with simplicity and extensibility in mind.
> > It's built upon the existing restart and reboot APIs. The simplicity
> > is in new helper functions that are convenient for drivers. The
> > extensibility is in the design that doesn't hardcode callback
> > arguments, making easy to add new parameters and remove old.
> >
> > This is a third attempt to introduce the new API. First was made by
> > Guenter Roeck back in 2014, second was made by Thierry Reding in 2017.
> > In fact the work didn't stop and recently arm_pm_restart() was removed
> > from v5.14 kernel, which was a part of preparatory work started by
> > Guenter Roeck. I took into account experience and ideas from the
> > previous attempts, extended and polished them.
>
>
> Rafael and all, do you see anything critical that needs to be improved
> in this v6?
>
> Will be great if you could take this patchset via the power tree if it
> looks okay, or give an ack.
I need some more time for this, sorry.
I'm a bit concerned about seeing no response to this set from anyone.
It looks like multiple platforms may be affected by it in principle,
so doesn't anyone care?
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