linux-kernel - Re: [EXT] Re: [PATCH] nvme: Add abrupt shutdown support

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Message-ID: <20210705115349.GA20266@lst.de>
Date:   Mon, 5 Jul 2021 13:53:49 +0200
From:   Christoph Hellwig <hch@....de>
To:     "Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@...ron.com>
Cc:     Christoph Hellwig <hch@....de>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "shiva.linuxworks@...il.com" <shiva.linuxworks@...il.com>
Subject: Re: [EXT] Re: [PATCH] nvme: Add abrupt shutdown support

On Mon, Jul 05, 2021 at 11:15:51AM +0000, Shivamurthy Shastri (sshivamurthy) wrote:
> For systems with passive electronic components to handle power-loss/battery-removal,
> CC.SHN=10b will help to achieve safer shutdown with relatively lower power back-up 
> requirements (at lower cost).
> 
> The module parameter gives flexibility to the host to decide shutdown type even during
> boot failure. 

If you have a device that always prefers an abrupt please introduce a TP
in the NVMe technical working group so that the hosts automatically
do the right thing.  Requiring sysadmin intervention using a global
kernel parameter is not the way to do this.