linux-pci.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Sinan Kaya <okaya@codeaurora.org>
To: Bjorn Helgaas <helgaas@kernel.org>,
	Paul Menzel <pmenzel+linux-pci@molgen.mpg.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	Lukas Wunner <lukas@wunner.de>
Subject: Re: pciehp 0000:00:1c.0:pcie004: Timeout on hotplug command 0x1038 (issued 65284 msec ago)
Date: Fri, 27 Apr 2018 15:34:30 -0400	[thread overview]
Message-ID: <b62c2a8e-fe14-6d7d-147c-0ce3b0c0ab2f@codeaurora.org> (raw)
In-Reply-To: <20180427192207.GG8199@bhelgaas-glaptop.roam.corp.google.com>

Hi Bjorn,

Thanks for adding me.

On 4/27/2018 3:22 PM, Bjorn Helgaas wrote:
> Sinan mooted the idea of using a "no-wait" path of sending the "don't
> generate hotplug interrupts" command.  I think we should work on this
> idea a little more.  If we're shutting down the whole system, I can't
> believe there's much value in *anything* we do in the pciehp_remove()
> path.
> 
> Maybe we should just get rid of pciehp_remove() (and probably
> pcie_port_remove_service() and the other service driver remove methods)
> completely.  That dates from when the service drivers could be modules that
> could be potentially unloaded, but unloading them hasn't been possible for
> years.

Shutdown path is also used for kexec. Leaving hotplug interrupts pending is
dangerous for the newly loaded kernel as it leaves spurious interrupts
during the new kernel boot.

I think we should always disable the hotplug interrupt on shutdown. We might
think of not waiting for command-completion as a middle-ground or go to polling
path instead of interrupts all the time.

Sinan

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.

  reply	other threads:[~2018-04-27 19:34 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-26 10:17 pciehp 0000:00:1c.0:pcie004: Timeout on hotplug command 0x1038 (issued 65284 msec ago) Paul Menzel
2018-04-27 19:22 ` Bjorn Helgaas
2018-04-27 19:34   ` Sinan Kaya [this message]
2018-04-27 21:12     ` Bjorn Helgaas
2018-04-28  0:56       ` Dave Young
2018-04-28  1:18         ` Dave Young
2018-04-28 13:03           ` okaya
2018-04-30 20:48             ` Sinan Kaya
2018-04-30 21:17               ` Bjorn Helgaas
2018-04-30 21:27                 ` Sinan Kaya
2018-04-30 21:38                   ` Lukas Wunner
2018-05-01 12:38                   ` Sinan Kaya
2018-05-01 12:59                     ` Marc Zyngier
2018-05-01 13:25                       ` Bjorn Helgaas
2018-05-01 16:31                         ` Marc Zyngier
2018-05-01 22:32                           ` Eric W. Biederman
2018-05-03  8:49   ` Paul Menzel
2018-05-04  2:45     ` Bjorn Helgaas
2018-05-04  6:37       ` okaya
2018-05-04 13:33         ` Bjorn Helgaas
2018-05-04 14:24           ` okaya
2018-05-06  9:35           ` Paul Menzel
2018-05-07 21:33           ` Bjorn Helgaas
2018-05-08  6:59             ` Paul Menzel
2018-05-08 12:34               ` Bjorn Helgaas
2018-05-08 13:22                 ` Paul Menzel
2018-05-09 11:41   ` Lukas Wunner
2018-05-09 12:57     ` Bjorn Helgaas
2018-05-09 13:16       ` Lukas Wunner

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=b62c2a8e-fe14-6d7d-147c-0ce3b0c0ab2f@codeaurora.org \
    --to=okaya@codeaurora.org \
    --cc=bhelgaas@google.com \
    --cc=helgaas@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=lukas@wunner.de \
    --cc=pmenzel+linux-pci@molgen.mpg.de \
    /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
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
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).