linux-kernel - Re: [PATCH v3 5/6] Watchdog: introduce ARM SBSA watchdog driver

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Message-ID: <CADyBb7vcYoCMGMZ102yfHQtNQtAPdhKBSYw20naxMmjhqsf5-g@mail.gmail.com>
Date:	Fri, 29 May 2015 23:05:34 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	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>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, vgandhi@...eaurora.org,
	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>
Subject: Re: [PATCH v3 5/6] Watchdog: introduce ARM SBSA watchdog driver

Hi Guenter,



On 29 May 2015 at 22:54, Guenter Roeck <linux@...ck-us.net> wrote:
> On 05/29/2015 02:11 AM, Fu Wei wrote:
> [ ... ]
>
>>>> +
>>>> +       status = sbsa_gwdt_cf_read(SBSA_GWDT_WCS, wdd);
>>>> +       if (status & SBSA_GWDT_WCS_WS1) {
>>>> +               dev_warn(dev, "System reset by WDT(WCS: %x, WCV:
>>>> %llx)\n",
>>>> +                        status, sbsa_gwdt_get_wcv(wdd));
>>>
>>>
>>>
>>> Does this message (specifically the WCS / WCV values) have any
>>> useful meaning for the user ?
>>
>>
>> I think so, according to SBSA spec:
>> If WS0 is asserted and a timeout refresh occurs then the following must
>> occur:
>>      If the system is compliant to SBSA level 2 or higher the compare
>> value must retain its current value. This means that the compare value
>> records the time that WS1 is asserted.
>>
>> So, I think WCV can log the time when system reset by WDT, that may
>> help user figure out the problem. but WCS can be delete I think.
>>
>
> How would that help ? It is just a number with no reference to anything.

This number is the time, when system reset by watchdog
WCV : the number of clock, from system boot  to system reset.
Is that worthy to be logged? any suggestion ? :-)

>
> Thanks,
> Guenter
>



-- 
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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