linux-kernel - RE: nvme may get timeout from dd when using different non-prefetch mmio outbound/ranges

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Date:   Mon, 25 Oct 2021 09:02:52 +0000
From:   Li Chen <lchen@...arella.com>
To:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
CC:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>, "kw@...ux.com" <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: nvme may get timeout from dd when using different non-prefetch
 mmio outbound/ranges

> [   81.634065][    T7] nvme nvme0: Shutdown timeout set to 8 seconds
> [   81.674332][    T7] nvme nvme0: 1/0/0 default/read/poll queues
> [  112.168136][  T256] nvme nvme0: I/O 12 QID 1 timeout, disable controller

I/O 12 QID 1 is nvme_cmd_write, reproduce after rebooting and using ftrace:

# dmesg | grep QID
[   99.456260] nvme nvme0: I/O 128 QID 1 timeout, disable controller
# grep "qid=1" /sys/kernel/tracing/trace | egrep "cmdid=128\b"
    kworker/0:1H-65      [000] ....    68.987492: nvme_setup_cmd: nvme0: disk=nvme0n1, qid=1, cmdid=128, nsid=1, flags=0x0, meta=0x0, cmd=(nvme_cmd_write slba=216856, len=1015, ctrl=0x0, dsmgmt=0, reftag=0)
          <idle>-0       [001] ..s1    99.475164: nvme_complete_rq: nvme0: disk=nvme0n1, qid=1, cmdid=128, res=0x0, retries=1, flags=0x1, status=0x371

Regards,
Li

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