linux-kernel - Re: [PATCH v2 11/11] mtd: new support oops logger based on pstore/blk

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Message-ID: <5e95d596-3ba1-09e6-1777-007a5257f1cc@allwinnertech.com>
Date:   Wed, 19 Feb 2020 09:13:14 +0800
From:   liaoweixiong <liaoweixiong@...winnertech.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v2 11/11] mtd: new support oops logger based on pstore/blk

hi Miquel Raynal,

On 2020/2/18 下午6:34, Miquel Raynal wrote:
> Hi WeiXiong,
> 
> WeiXiong Liao <liaoweixiong@...winnertech.com> wrote on Fri,  7 Feb
> 2020 20:25:55 +0800:
> 
>> It's the last one of a series of patches for adaptive to MTD device.
>>
>> The mtdpstore is similar to mtdoops but more powerful. It bases on
>> pstore/blk, aims to store panic and oops logs to a flash partition,
>> where it can be read back as files after mounting pstore filesystem.
>>
>> The pstore/blk and blkoops, a wrapper for pstore/blk, are designed for
>> block device at the very beginning, but now, compatible to not only
>> block device. After this series of patches, pstore/blk can also work
>> for MTD device. To make it work, 'blkdev' on kconfig or module
>> parameter of blkoops should be set as mtd device name or mtd number.
>> See more about pstore/blk and blkoops on:
>>     Documentation/admin-guide/pstore-block.rst
>>
>> Why do we need mtdpstore?
>> 1. repetitive jobs between pstore and mtdoops
>>    Both of pstore and mtdoops do the same jobs that store panic/oops log.
>>    They have much similar logic that register to kmsg dumper and store
>>    log to several chunks one by one.
>> 2. do what a driver should do
>>    To me, a driver should provide methods instead of policies. What MTD
>>    should do is to provide read/write/erase operations, geting rid of codes
>>    about chunk management, kmsg dumper and configuration.
>> 3. enhanced feature
>>    Not only store log, but also show it as files.
>>    Not only log, but also trigger time and trigger count.
>>    Not only panic/oops log, but also log recorder for pmsg, console and
>>    ftrace in the future.
>>
>> Signed-off-by: WeiXiong Liao <liaoweixiong@...winnertech.com>
> 
> Acked-by: Miquel Raynal <miquel.raynal@...tlin.com>
> 
> Richard, your PoV on this is welcome.
> 
> I suppose this patch depends on the others to work correctly so maybe
> we should wait the next release before applying it.
> 

Of couse, thank you for your review

> Thanks,
> Miquèl
> 

-- 
liaoweixiong