linux-kernel - Re: [PATCH 7/9] nvme-apple: Serialize command issue

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Date:   Thu, 24 Mar 2022 07:16:50 +0100
From:   Christoph Hellwig <hch@....de>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Marc Zyngier <maz@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 7/9] nvme-apple: Serialize command issue

On Mon, Mar 21, 2022 at 05:50:47PM +0100, Sven Peter wrote:
> From: Jens Axboe <axboe@...nel.dk>
> 
> This controller shouldn't need serialization of command issue since
> the SQ is replaced by a simple array and commands are issued by writing
> the array index to a MMIO register.
> Without serialization however sometimes commands are still executed
> correctly and appear in the CQ but never trigger an interrupt.
> 
> Signed-off-by: Jens Axboe <axboe@...nel.dk>
> [sven: added our best guess why this needs to be done]
> Signed-off-by: Sven Peter <sven@...npeter.dev>

This really should go into the previous patch.