linux-kernel - Re: [PATCH v3 00/17] Introduce ACPI for ARM64 based on ACPI 5.1

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Date:	Thu, 11 Sep 2014 16:23:04 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Mark Rutland <mark.rutland@....com>,
	Olof Johansson <olof@...om.net>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Will Deacon <will.deacon@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles.Garcia-Tobin@....com, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH v3 00/17] Introduce ACPI for ARM64 based on ACPI 5.1

On Thursday, September 11, 2014 02:29:34 PM Grant Likely wrote:
> On Mon,  1 Sep 2014 22:57:38 +0800, Hanjun Guo <hanjun.guo@...aro.org> wrote:
> > ACPI 5.1 has been released and now be freely available for
> > download [1]. It fixed some major gaps to run ACPI on ARM,
> > this patch just follow the ACPI 5.1 spec and prepare the
> > code to run ACPI on ARM64.
> > 
> > ACPI 5.1 has some major changes for the following tables and
> > method which are essential for ARM platforms:
> > 1) MADT table updates.
> > 2) FADT updates for PSCI
> > 3) GTDT
> > 
> > This patch set is the ARM64 ACPI core patches covered MADT, FADT
> > and GTDT, platform board specific drivers are not covered by this
> > patch set, but we provide drivers for Juno to boot with ACPI only
> > in the follwing patch set for review purpose.
> > 
> > We first introduce acpi.c and its related head file which are needed
> > by ACPI core, and then get RSDP to extract all the ACPI boot-time tables.
> > When all the boot-time tables (FADT, MADT, GTDT) are ready, then
> > parse them to init the sytem when booted. Specifically, 
> > a) we use FADT to init PSCI and use PSCI to boot SMP;
> > b) Use MADT for GIC init and SMP init;
> > c) GTDT for arch timer init.
> > 
> > This patch set is based on 3.17-rc2 and was tested by Graeme on Juno
> > and FVP base model boot with ACPI only OK, if you want to test them,
> > you can pull from acpi-5.1-v3 branch in leg/acpi repo:
> > git://git.linaro.org/leg/acpi/acpi.git
> > 
> > Updates since v2:
> >  - Refactor the code to make SMP/PSCI init with less sperated init
> >    path by Tomasz
> >  - make ACPI depend on EXPERT
> >  - Address lots of comments from Catalin, Sudeep, Geoff
> >  - Add Juno device ACPI driver patches for review
> > 
> > Updates since v1:
> >  - Set ACPI default off on ARM64 suggested by Olof;
> >  - Rebase the patch set on top of linux-next branch/linux-pm tree which
> >    includes the ACPICA for full ACPI 5.1 support.
> >  - Update the document as suggested;
> >  - Adress lots of comments from Mark, Sudeep, Randy, Naresh, Olof, Geoff
> >    and more...
> > 
> > [1]: http://www.uefi.org/sites/default/files/resources/ACPI_5_1release.pdf
> 
> I've read through this entire series now. In my mind, aside from a few
> comments that I know you're addressing, this is ready.  The hooks into
> arm64 core code are not terribly invasive, it is nicely organized and
> manageable. Get the next version out ASAP, but I would also like to see
> the diffs from this version to the next so I don't need to review the
> entire series again.
> 
> Regarding the requests to refactor ACPICA to work better for ARM. I
> completely agree that it should be done, but I do not think it should be
> a prerequisite to getting this core support merged. That kind of
> refactoring is far easier to justify when it has immediate improvement
> on the mainline codebase, and it gives us a working baseline to test
> against. Doing it the other way around just makes things harder.
> 
> I would really like to see the next version of this series go into
> linux-next. I think this is ready for some wider exposure. Have you got
> a branch being pulled into Fengguang's autobuilder yet?

Having looked at the patches recently, I don't see any major problems in
them from the ACPI core perspective, so to me they are good to go.

Question is who's going to handle them?

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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