linux-kernel - Re: [PATCH v2 6/7] nvme-pci: add device coredump support

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Date:   Tue, 7 May 2019 11:44:58 -0600
From:   "Heitke, Kenneth" <kenneth.heitke@...el.com>
To:     Akinobu Mita <akinobu.mita@...il.com>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Jens Axboe <axboe@...com>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 6/7] nvme-pci: add device coredump support



On 5/7/2019 10:58 AM, Akinobu Mita wrote:
> This enables to capture snapshot of controller information via device
> coredump machanism.

s/machanism/mechanism/

> 
> The nvme device coredump creates the following coredump files.
> 
> - regs: NVMe controller registers (00h to 4Fh)
> - sq<qid>: Submission queue
> - cq<qid>: Completion queue
> - telemetry-ctrl-log: Telemetry controller-initiated log (if available)
> - data: Empty
> 
> The reason for an empty 'data' file is to provide a uniform way to notify
> the device coredump is no longer needed by writing the 'data' file.
> 
> Since all existing drivers using the device coredump provide a 'data' file
> if the nvme device coredump doesn't provide it, the userspace programs need
> to know which driver provides what coredump file.
> 
> Cc: Johannes Berg <johannes@...solutions.net>
> Cc: Keith Busch <keith.busch@...el.com>
> Cc: Jens Axboe <axboe@...com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Sagi Grimberg <sagi@...mberg.me>
> Cc: Minwoo Im <minwoo.im.dev@...il.com>
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>