linux-kernel - Re: [PATCH v7 0/8] Watchdog: introduce ARM SBSA watchdog driver

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Message-ID: <CADyBb7tS+_6nSLdiOB0ohrzqiPyc0aBkO=b3Uq+pyGMy_m=ALg@mail.gmail.com>
Date:	Wed, 30 Sep 2015 13:22:56 -0400
From:	Fu Wei <fu.wei@...aro.org>
To:	Pratyush Anand <panand@...hat.com>
Cc:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, linux-doc@...r.kernel.org,
	Wei Fu <tekkamanninja@...il.com>,
	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>, Arnd Bergmann <arnd@...db.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Vipul Gandhi <vgandhi@...eaurora.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	Jon Masters <jcm@...hat.com>, Leo Duran <leo.duran@....com>,
	Jon Corbet <corbet@....net>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Rafael Wysocki <rjw@...ysocki.net>,
	Dave Young <dyoung@...hat.com>
Subject: Re: [PATCH v7 0/8] Watchdog: introduce ARM SBSA watchdog driver

Hi Pratyush,

Great thanks for your testing, this info is very helpful. :-)
my new patchset will come out soon.

On 30 September 2015 at 13:13, Pratyush Anand <panand@...hat.com> wrote:
> Hi Fu Wei,
>
> On 25/08/2015:01:01:15 AM, fu.wei@...aro.org wrote:
>> From: Fu Wei <fu.wei@...aro.org>
>>
>> This patchset:
>>     (1)Introduce Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt
>>     for FDT info of SBSA Generic Watchdog, and give two examples of
>>     adding SBSA Generic Watchdog device node into the dts files:
>>     foundation-v8.dts and amd-seattle-soc.dtsi.
>>
>>     (2)Introduce "pretimeout" into the watchdog framework, and update
>>     Documentation/watchdog/watchdog-kernel-api.txt to introduce:
>>         (1)the new elements in the watchdog_device and watchdog_ops struct;
>>         (2)the new API "watchdog_init_timeouts".
>>
>>     (3)Introduce ARM SBSA watchdog driver:
>>         a.Use linux kernel watchdog framework;
>>         b.Work with FDT on ARM64;
>>         c.Use "pretimeout" in watchdog framework;
>>         d.Support getting timeout and pretimeout from parameter and FDT
>>           at the driver init stage.
>>         e.In the first timeout, do panic to save system context;
>>         f.In the second stage, user can still feed the dog without
>>           cleaning WS0. By this feature, we can avoid the panic infinite
>>           loops, while backing up a large system context in a server.
>>         g.In the second stage, can trigger WS1 by setting pretimeout = 0
>>           if necessary.
>>
>>     (4)Introduce ACPI GTDT parser: drivers/acpi/gtdt.c
>>     Parse SBSA Generic Watchdog Structure in GTDT table of ACPI,
>>     and create a platform device with that information.
>>     This platform device can be used by This Watchdog driver.
>>     drivers/clocksource/arm_arch_timer.c is simplified by this GTDT support.
>>
>> This patchset has been tested with watchdog daemon
>> (ACPI/FDT, module/build-in) on the following platforms:
>>     (1)ARM Foundation v8 model
>>
>
> I tested it with kdump on fedora-arm64 Seattle platform. I enabled watchdog
> using systemd (with 30s timeout), insured that watchdog is active and then
> crashed the system. I can see that kdump kernel loads sbsa_wdt and activates
> watchdog, still vmcore copy is done successfully.
> My test kernel is here [1]
>
> ~Pratyush
>
> [1] https://github.com/pratyushanand/linux/commits/wdt/sbsa-test-kexec



-- 
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
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