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

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Message-Id: <292b8bf3-80e5-49f0-86c0-b68cca335717@www.fastmail.com>
Date:   Sat, 02 Apr 2022 14:42:01 +0200
From:   "Sven Peter" <sven@...npeter.dev>
To:     "hch@....de" <hch@....de>
Cc:     "Keith Busch" <kbusch@...nel.org>, "axboe@...com" <axboe@...com>,
        "sagi@...mberg.me" <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 Thu, Mar 24, 2022, at 07:16, Christoph Hellwig wrote:
> 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.

Ok, I'll squash it (and the following two patches) into the previous one.

Sven