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

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Message-Id: <cd6c9623-60c6-44dc-8ff3-addfb31efd6d@www.fastmail.com>
Date:   Wed, 27 Apr 2022 17:40:06 +0200
From:   "Sven Peter" <sven@...npeter.dev>
To:     "Keith Busch" <kbusch@...nel.org>
Cc:     "axboe@...com" <axboe@...com>, "hch@....de" <hch@....de>,
        "sagi@...mberg.me" <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 23:00, Keith Busch wrote:
> 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.

Makes sense, will add it.


Sven