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

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Date:   Tue, 18 Feb 2020 11:34:49 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     WeiXiong Liao <liaoweixiong@...winnertech.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 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.

Thanks,
Miquèl