linux-kernel - Re: [PATCH 2/2] nvme: Handle shut down controllers during initialization

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Message-ID: <20230111045032.GA15520@lst.de>
Date:   Wed, 11 Jan 2023 05:50:32 +0100
From:   Christoph Hellwig <hch@....de>
To:     Hector Martin <marcan@...can.st>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Eric Curtin <ecurtin@...hat.com>, Janne Grunau <j@...nau.net>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] nvme: Handle shut down controllers during
 initialization

On Wed, Jan 11, 2023 at 01:36:14PM +0900, Hector Martin wrote:
> According to the spec, controllers need an explicit reset to become
> active again after a controller shutdown. Check for this state in
> nvme_enable_ctrl and issue an explicit disable if required, which will
> trigger the required reset.

I don't think this belongs into nvme_enable_ctrl.  It seems like
nvme-apple is missing the equivalent to the nvme_disable_ctrl call
in nvme_pci_configure_admin_queue, though.