linux-kernel - Appending firmware/hardware dump to vmcore during kernel panic

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Message-ID: <20180220105613.GA9766@chelsio.com>
Date:   Tue, 20 Feb 2018 16:26:14 +0530
From:   Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
        davem@...emloft.net, ganeshgr@...lsio.com, nirranjan@...lsio.com,
        indranil@...lsio.com, rahul.lakkireddy@...lsio.com
Subject: Appending firmware/hardware dump to vmcore during kernel panic

Hi all,

We have a requirement to collect firmware/hardware state of the
underlying NIC during kernel panic.  We are doing this in cxgb4
driver, using panic notifier list [1].  cxgb4 registers a callback
function to the panic notifier list, which gets invoked during kernel
panic. In the callback function, firmware/hardware dump is collected
into pre-allocated buffer and then extracted later from the vmcore,
for post-analysis.

Is this approach of using panic notifier correct?  Any suggestions are
much appreciated.

Thanks,
Rahul

[1] https://patchwork.ozlabs.org/patch/873830/