linux-kernel - Re: [PATCH v4 0/5] acpi, clocksource, kvm: add GTDT and ARM memory-mapped timer support

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Message-ID: <CADyBb7tx=BvvuP1jLMMKug7jtUJV3gVkbvhUU3ZYvCeLfwUD6A@mail.gmail.com>
Date:	Fri, 18 Mar 2016 17:28:24 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Timur Tabi <timur@...eaurora.org>, Len Brown <lenb@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <marc.zyngier@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
	Richard Ruigrok <rruigrok@...eaurora.org>,
	"Abdulhamid, Harb" <harba@...eaurora.org>,
	Christopher Covington <cov@...eaurora.org>,
	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>, Jon Masters <jcm@...hat.com>,
	<"wei@...hat.com--cc=arnd"@arndb.de>,
	Wim Van Sebroeck <wim@...ana.be>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Leo Duran <leo.duran@....com>
Subject: Re: [PATCH v4 0/5] acpi, clocksource, kvm: add GTDT and ARM
 memory-mapped timer support

Hi Rafael,

On 18 March 2016 at 12:22, Fu Wei <fu.wei@...aro.org> wrote:
> Hi Rafael,
>
> Great thanks for your feedback!
>
> On 18 March 2016 at 08:41, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>> On Thursday, March 17, 2016 10:07:30 AM Timur Tabi wrote:
>>> fu.wei@...aro.org wrote:
>>> > From: Fu Wei <fu.wei@...aro.org>
>>> >
>>> > This patchset:
>>> >      (1)Move some enums and marcos to header file for arm_arch_timer,
>>> >      improve the pr_* code by defining "pr_fmt(fmt)" in arm_arch_timer.c
>>> >
>>> >      (2)Introduce ACPI GTDT parser: drivers/acpi/gtdt.c
>>> >      Parse all kinds of timer in GTDT table of ACPI:arch timer,
>>> >      memory-mapped timer and SBSA Generic Watchdog timer.
>>> >      This driver can help to simplify all the relevant timer drivers,
>>> >      and separate all the ACPI GTDT knowledge from them.
>>> >
>>> >      (3)Simplify ACPI code for arch timer in arm_arch_timer.c
>>> >
>>> >      (4)Add memory-mapped timer support in arm_arch_timer.c
>>>
>>> The SBSA watchdog driver is already in watchdog-next and will be merged
>>> into 4.6.  These five patches are necessary for the watchdog driver to
>>> probe on an ACPI system.
>>>
>>> I'm guessing since that v4 was posted in the middle of the 4.6 merge
>>> window, that these patches won't make it and we'll have to wait until
>>> 4.7 (at the earliest)?
>>
>> First off, the last version I've seen is the v3.  I must have overlooked
>> the v4 then, but I don't think it was CCed to linux-acpi (which should
>> have happened).
>
> Sorry for this, That is my fault. I updated the script of git-send-email for
> sending the v4 patchset, but lost a space between two "--cc". :-(

I have re-posted the v4 patchset:

https://lkml.org/lkml/2016/3/18/80

>
>>
>> Second, these patches require review from multiple maintainers and (or including)
>> people who actually know how the GTDT is supposed to be used.  I haven't
>> seen any responses from any of them yet, so the answer to your question is
>> "yes".
>>
>> I will have a couple of comments for patch [1/6] (in the v3), but it's
>> not been a priority due to the apparent overall lack of interest in this
>> series.
>
> Since this device is a generic  watchdog for ARM server, it is(will be) used
> in a lot of chips. So I think many people are interested in it. They
> haven't  provided
> any feedback, maybe due to my "--cc" mistake, or busy on something
> else now.  :-(
>
> I would like to learn your comments for patch [1/6] , then improve my
> v4, post v5
> ASAP.
>
> This patchset includes GTDT and memory-mapped timer patches, because my
> memory-mapped timer patches depends on GTDT.
> But maybe we can upstream GTDT separately?
>
> any suggestion?
>
> Thanks for your help!
>
>
>>
>> Thanks,
>> Rafael
>>
>
>
>
> --
> Best regards,
>
> Fu Wei
> Software Engineer
> Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
> Ph: +86 21 61221326(direct)
> Ph: +86 186 2020 4684 (mobile)
> Room 1512, Regus One Corporate Avenue,Level 15,
> One Corporate Avenue,222 Hubin Road,Huangpu District,
> Shanghai,China 200021



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
Room 1512, Regus One Corporate Avenue,Level 15,
One Corporate Avenue,222 Hubin Road,Huangpu District,
Shanghai,China 200021