linux-pci.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Lukas Wunner <lukas@wunner.de>
To: Yicong Yang <yangyicong@hisilicon.com>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
	Sathyanarayanan Kuppuswamy 
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Ethan Zhao <haifeng.zhao@intel.com>,
	Sinan Kaya <okaya@kernel.org>, Ashok Raj <ashok.raj@intel.com>,
	Keith Busch <kbusch@kernel.org>,
	linux-pci@vger.kernel.org, Russell Currey <ruscur@russell.cc>,
	Oliver O'Halloran <oohall@gmail.com>,
	Stuart Hayes <stuart.w.hayes@gmail.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Linuxarm <linuxarm@huawei.com>
Subject: Re: [PATCH] PCI: pciehp: Ignore Link Down/Up caused by DPC
Date: Wed, 28 Apr 2021 16:40:41 +0200	[thread overview]
Message-ID: <20210428144041.GA27967@wunner.de> (raw)
In-Reply-To: <4177f0be-5859-9a71-da06-2e67641568d7@hisilicon.com>

On Wed, Apr 28, 2021 at 06:08:02PM +0800, Yicong Yang wrote:
> I've tested the patch on our board, but the hotplug will still be
> triggered sometimes.
> seems the hotplug doesn't find the link down event is caused by dpc.
> Any further test I can do?
> 
> mestuary:/$ [12508.408576] pcieport 0000:00:10.0: DPC: containment event, status:0x1f21 source:0x0000
> [12508.423016] pcieport 0000:00:10.0: DPC: unmasked uncorrectable error detected
> [12508.434277] pcieport 0000:00:10.0: PCIe Bus Error: severity=Uncorrected (Non-Fatal), type=Transaction Layer, (Completer ID)
> [12508.447651] pcieport 0000:00:10.0:   device [19e5:a130] error status/mask=00008000/04400000
> [12508.458279] pcieport 0000:00:10.0:    [15] CmpltAbrt              (First)
> [12508.467094] pcieport 0000:00:10.0: AER:   TLP Header: 00000000 00000000 00000000 00000000
> [12511.152329] pcieport 0000:00:10.0: pciehp: Slot(0): Link Down

Note that about 3 seconds pass between DPC trigger and hotplug link down
(12508 -> 12511).  That's most likely the 3 second timeout in my patch:

+	/*
+	 * Need a timeout in case DPC never completes due to failure of
+	 * dpc_wait_rp_inactive().
+	 */
+	wait_event_timeout(dpc_completed_waitqueue, dpc_completed(pdev),
+			   msecs_to_jiffies(3000));

If DPC doesn't recover within 3 seconds, pciehp will consider the
error unrecoverable and bring down the slot, no matter what.

I can't tell you why DPC is unable to recover.  Does it help if you
raise the timeout to, say, 5000 msec?

Thanks,

Lukas

  reply	other threads:[~2021-04-28 14:40 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-28  8:52 Lukas Wunner
2021-03-30 20:53 ` Kuppuswamy, Sathyanarayanan
2021-04-28  0:39   ` Kuppuswamy, Sathyanarayanan
2021-04-28  1:42     ` Zhao, Haifeng
2021-04-28 10:08 ` Yicong Yang
2021-04-28 14:40   ` Lukas Wunner [this message]
2021-04-29 11:29     ` Yicong Yang
2021-04-29 12:40       ` Zhao, Haifeng
2021-04-29 19:42       ` Lukas Wunner
2021-04-30  8:47         ` Yicong Yang
2021-04-30 12:15           ` Lukas Wunner
2021-04-29 19:36 ` Keith Busch
2021-04-29 20:16   ` Lukas Wunner
2021-04-29 21:16     ` Keith Busch

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210428144041.GA27967@wunner.de \
    --to=lukas@wunner.de \
    --cc=ashok.raj@intel.com \
    --cc=dan.j.williams@intel.com \
    --cc=haifeng.zhao@intel.com \
    --cc=helgaas@kernel.org \
    --cc=kbusch@kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=linuxarm@huawei.com \
    --cc=mika.westerberg@linux.intel.com \
    --cc=okaya@kernel.org \
    --cc=oohall@gmail.com \
    --cc=ruscur@russell.cc \
    --cc=sathyanarayanan.kuppuswamy@linux.intel.com \
    --cc=stuart.w.hayes@gmail.com \
    --cc=yangyicong@hisilicon.com \
    --subject='Re: [PATCH] PCI: pciehp: Ignore Link Down/Up caused by DPC' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).