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

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Date:   Mon, 5 Jul 2021 11:15:51 +0000
From:   "Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@...ron.com>
To:     Christoph Hellwig <hch@....de>
CC:     "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

Micron Confidential

> >
> > Hi Christoph,
> >
> > >
> > >
> > > On Mon, Jul 05, 2021 at 10:11:57AM +0000, shiva.linuxworks@...il.com
> wrote:
> > > > From: Shivamurthy Shastri <sshivamurthy@...ron.com>
> > > >
> > > > Enabling the abrupt shutdown support. In this shutdown type host does
> > > > not need to send Delete I/O Submission Queue and Delete I/O Completion
> > > > queue commands to the device.
> > >
> > > Why?
> >
> > This is to achieve faster shutdown at the cost of data in-flight.
> 
> What is the actual use case, and why would a module paramter be a good
> interface?

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. 

Thanks,
Shiva

Micron Confidential