linux-kernel - RE: [PATCH V3 1/1] nvme: Add quirk for LiteON CL1 devices running FW 220TQ,22001

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Message-ID: <HK2PR02MB4004E96D4FEF0589232CF694EE140@HK2PR02MB4004.apcprd02.prod.outlook.com>
Date:   Thu, 29 Oct 2020 03:21:27 +0000
From:   Gloria Tsai <Gloria.Tsai@...tc.com>
To:     Keith Busch <kbusch@...nel.org>
CC:     Jongpil Jung <jongpuls@...il.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        Jens Axboe <axboe@...com>,
        "dj54.sohn@...sung.com" <dj54.sohn@...sung.com>,
        "jongpil19.jung@...sung.com" <jongpil19.jung@...sung.com>,
        "jongheony.kim@...sung.com" <jongheony.kim@...sung.com>,
        Christoph Hellwig <hch@....de>
Subject: RE: [PATCH V3 1/1] nvme: Add quirk for LiteON CL1 devices running FW
 220TQ,22001

Correct, it's device SRAM.


Regards,
Gloria Tsai
_____________________________________

Sales PM Division
Solid State Storage Technology Corporation
TEL: +886-3-612-3888 ext. 2201
E-Mail: gloria.tsai@...tc.com
_____________________________________

-----Original Message-----
From: Keith Busch <kbusch@...nel.org> 
Sent: Thursday, October 29, 2020 11:15 AM
To: Gloria Tsai <Gloria.Tsai@...tc.com>
Cc: Jongpil Jung <jongpuls@...il.com>; Sagi Grimberg <sagi@...mberg.me>; linux-kernel@...r.kernel.org; linux-nvme@...ts.infradead.org; Jens Axboe <axboe@...com>; dj54.sohn@...sung.com; jongpil19.jung@...sung.com; jongheony.kim@...sung.com; Christoph Hellwig <hch@....de>
Subject: Re: [PATCH V3 1/1] nvme: Add quirk for LiteON CL1 devices running FW 220TQ,22001



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On Thu, Oct 29, 2020 at 11:33:06AM +0900, Keith Busch wrote:
> On Thu, Oct 29, 2020 at 02:20:27AM +0000, Gloria Tsai wrote:
> > Corrected the description of this bug that SSD will not do GC after receiving shutdown cmd.
> > Do GC before shutdown -> delete IO Q -> shutdown from host -> 
> > breakup GC -> D3hot -> enter PS4 -> have a chance swap block -> use 
> > wrong pointer on device SRAM -> over program
>
> What do you mean by "wrong pointer"? At the place in the sequence 
> you're referring to, the PCI BME is disabled: you can't access *any* 
> host RAM, so there's no "correct" pointer either.

Re-reading your message, I do see you said "device" rather than "host", so my response may not be relevant.