linux-kernel - RE: [EXT] Re: [PATCH v2 0/2] Abrupt Shutdown for NVMe SSD

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Date:   Thu, 29 Jul 2021 10:37:18 +0000
From:   "Shivamurthy Shastri (sshivamurthy)" <sshivamurthy@...ron.com>
To:     Keith Busch <kbusch@...nel.org>
CC:     "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "pavel@....cz" <pavel@....cz>,
        "len.brown@...el.com" <len.brown@...el.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "axboe@...com" <axboe@...com>, "hch@....de" <hch@....de>,
        "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 v2 0/2] Abrupt Shutdown for NVMe SSD

Micron Confidential

Hi,

> 
> 
> On Mon, Jul 26, 2021 at 01:22:21PM +0000, shiva.linuxworks@...il.com wrote:
> > In the platform with a limited backup power supply, devices like NVMe
> > SSD does unsafe shutdown.
> >
> > These two patches address this issue by adding a power loss imminent
> > flag. The platform will enable the power loss imminent flag if the
> > platform's power is running on the limited backup power supply. During
> > the shutdown, the driver checks this information and pwerforms the
> > abrupt shutdown.
> 
> I think the pm framework and nvme usage are ok, but you need a platform
> specific caller to set the new power loss flag before this should be
> considered, otherwise this is just unreachable code.

Sure, I will send platform specific caller along with V3.

Thanks,
Shiva

Micron Confidential