linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Evan Green <evgreen@chromium.org>
To: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: x86@kernel.org, linux-pci <linux-pci@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"Ghorai, Sukumar" <sukumar.ghorai@intel.com>,
	"Amara, Madhusudanarao" <madhusudanarao.amara@intel.com>,
	"Nandamuri, Srikanth" <srikanth.nandamuri@intel.com>
Subject: Re: MSI interrupt for xhci still lost on 5.6-rc6 after cpu hotplug
Date: Thu, 19 Mar 2020 13:24:12 -0700	[thread overview]
Message-ID: <CAE=gft4Vx8tD71TXFD++hMLiExBWDNXn7LA6ohkGLwZvG2N6YQ@mail.gmail.com> (raw)
In-Reply-To: <806c51fa-992b-33ac-61a9-00a606f82edb@linux.intel.com>

On Wed, Mar 18, 2020 at 12:23 PM Mathias Nyman
<mathias.nyman@linux.intel.com> wrote:
>
> Hi
>
> I can reproduce the lost MSI interrupt issue on 5.6-rc6 which includes
> the "Plug non-maskable MSI affinity race" patch.
>
> I can see this on a couple platforms, I'm running a script that first generates
> a lot of usb traffic, and then in a busyloop sets irq affinity and turns off
> and on cpus:
>
> for i in 1 3 5 7; do
>         echo "1" > /sys/devices/system/cpu/cpu$i/online
> done
> echo "A" > "/proc/irq/*/smp_affinity"
> echo "A" > "/proc/irq/*/smp_affinity"
> echo "F" > "/proc/irq/*/smp_affinity"
> for i in 1 3 5 7; do
>         echo "0" > /sys/devices/system/cpu/cpu$i/online
> done
>
> I added some very simple debugging but I don't really know what to look for.
> xhci interrupts (122) just stop after a setting msi affinity, it survived many
> similar msi_set_affinity() calls before this.
>
> I'm not that familiar with the inner workings of this, but I'll be happy to
> help out with adding debugging and testing patches.

How quickly are you able to reproduce this when you run your script?
Does reverting Thomas' patch make it repro faster? Can you send the
output of lspci -vvv for the xhci device?

-Evan

  reply	other threads:[~2020-03-19 20:24 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-18 19:25 MSI interrupt for xhci still lost on 5.6-rc6 after cpu hotplug Mathias Nyman
2020-03-19 20:24 ` Evan Green [this message]
2020-03-20  8:07   ` Mathias Nyman
2020-03-20  9:52 ` Thomas Gleixner
2020-03-23  9:42   ` Mathias Nyman
2020-03-23 14:10     ` Thomas Gleixner
2020-03-23 20:32       ` Mathias Nyman
2020-03-24  0:24         ` Thomas Gleixner
2020-03-24 16:17           ` Evan Green
2020-03-24 19:03             ` Thomas Gleixner
2020-05-01 18:43               ` Raj, Ashok
2020-05-05 19:36                 ` Thomas Gleixner
2020-05-05 20:16                   ` Raj, Ashok
2020-05-05 21:47                     ` Thomas Gleixner
2020-05-07 12:18                       ` Raj, Ashok
2020-05-07 12:53                         ` Thomas Gleixner
2020-05-07 17:57                           ` Raj, Ashok
2020-05-07 19:41                             ` Thomas Gleixner
2020-03-25 17:12             ` Mathias Nyman
     [not found] <20200508005528.GB61703@otc-nc-03>
2020-05-08 11:04 ` Thomas Gleixner
2020-05-08 16:09   ` Raj, Ashok
2020-05-08 16:49     ` Thomas Gleixner
2020-05-11 19:03       ` Raj, Ashok
2020-05-11 20:14         ` Thomas Gleixner

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='CAE=gft4Vx8tD71TXFD++hMLiExBWDNXn7LA6ohkGLwZvG2N6YQ@mail.gmail.com' \
    --to=evgreen@chromium.org \
    --cc=bhelgaas@google.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=madhusudanarao.amara@intel.com \
    --cc=mathias.nyman@linux.intel.com \
    --cc=srikanth.nandamuri@intel.com \
    --cc=sukumar.ghorai@intel.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /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).