linux-kernel - Re: [PATCH v3 6/6] nvme-apple: Add initial Apple SoC NVMe driver

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Message-ID: <YmhdVJgd6DGRHPXd@kbusch-mbp.dhcp.thefacebook.com>
Date:   Tue, 26 Apr 2022 15:00:04 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Sven Peter <sven@...npeter.dev>
Cc:     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>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Marc Zyngier <maz@...nel.org>,
        Janne Grunau <j@...nau.net>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH v3 6/6] nvme-apple: Add initial Apple SoC NVMe driver

On Tue, Apr 26, 2022 at 10:15:39PM +0200, Sven Peter wrote:
> +static enum blk_eh_timer_return apple_nvme_timeout(struct request *req,
> +						   bool reserved)
> +{
> +	struct apple_nvme_iod *iod = blk_mq_rq_to_pdu(req);
> +	struct apple_nvme_queue *q = iod->q;
> +	struct apple_nvme *anv = queue_to_apple_nvme(q);
> +	unsigned long flags;
> +	u32 csts = readl(anv->mmio_nvme + NVME_REG_CSTS);
> +
> +	if (anv->ctrl.state != NVME_CTRL_LIVE) {
> +		/*
> +		 * From rdma.c:
> +		 * If we are resetting, connecting or deleting we should
> +		 * complete immediately because we may block controller
> +		 * teardown or setup sequence
> +		 * - ctrl disable/shutdown fabrics requests
> +		 * - connect requests
> +		 * - initialization admin requests
> +		 * - I/O requests that entered after unquiescing and
> +		 *   the controller stopped responding
> +		 *
> +		 * All other requests should be cancelled by the error
> +		 * recovery work, so it's fine that we fail it here.
> +		 */
> +		dev_warn(anv->dev,
> +			 "I/O %d(aq:%d) timeout while not in live state\n",
> +			 req->tag, q->is_adminq);
> +		if (blk_mq_request_started(req) &&
> +		    !blk_mq_request_completed(req)) {
> +			nvme_req(req)->status = NVME_SC_HOST_ABORTED_CMD;
> +			blk_mq_complete_request(req);

I think you need a 'nvme_req(req)->flags |= NVME_REQ_CANCELLED' here to get the
expected -EINTR for any admin command timeouts during a reset. Without it, the
resetting task is going to think it got a real response from the controller.

Other than that, this looks good.