linux-kernel - REGRESSION: Re: [patch V2 00/46] x86, PCI, XEN, genirq ...: Prepare for device MSI

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Date:   Thu, 12 Nov 2020 08:55:31 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ziyad Atiyyeh <ziyadat@...dia.com>,
        Itay Aveksis <itayav@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>
CC:     LKML <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        Joerg Roedel <joro@...tes.org>,
        <iommu@...ts.linux-foundation.org>, <linux-hyperv@...r.kernel.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "Jon Derrick" <jonathan.derrick@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Wei Liu <wei.liu@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Steve Wahl <steve.wahl@....com>,
        Dimitri Sivanich <sivanich@....com>,
        Russ Anderson <rja@....com>, <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        <xen-devel@...ts.xenproject.org>, Juergen Gross <jgross@...e.com>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Megha Dey" <megha.dey@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Baolu Lu <baolu.lu@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: REGRESSION: Re: [patch V2 00/46] x86, PCI, XEN, genirq ...: Prepare
 for device MSI

On Wed, Aug 26, 2020 at 01:16:28PM +0200, Thomas Gleixner wrote:
> This is the second version of providing a base to support device MSI (non
> PCI based) and on top of that support for IMS (Interrupt Message Storm)
> based devices in a halfways architecture independent way.

Hi Thomas,

Our test team has been struggling with a regression on bare metal
SRIOV VFs since -rc1 that they were able to bisect to this series

This commit tests good:

5712c3ed549e ("Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc")

This commit tests bad:

981aa1d366bf ("PCI: MSI: Fix Kconfig dependencies for PCI_MSI_ARCH_FALLBACKS")

They were unable to bisect further into the series because some of the
interior commits don't boot :(

When we try to load the mlx5 driver on a bare metal VF it gets this:

[Thu Oct 22 08:54:51 2020] DMAR: DRHD: handling fault status reg 2
[Thu Oct 22 08:54:51 2020] DMAR: [INTR-REMAP] Request device [42:00.2] fault index 1600 [fault reason 37] Blocked a compatibility format interrupt request
[Thu Oct 22 08:55:04 2020] mlx5_core 0000:42:00.1 eth4: Link down
[Thu Oct 22 08:55:11 2020] mlx5_core 0000:42:00.1 eth4: Link up
[Thu Oct 22 08:55:54 2020] mlx5_core 0000:42:00.2: mlx5_cmd_eq_recover:264:(pid 3390): Recovered 1 EQEs on cmd_eq
[Thu Oct 22 08:55:54 2020] mlx5_core 0000:42:00.2: wait_func_handle_exec_timeout:1051:(pid 3390): cmd0: CREATE_EQ(0Ã301) recovered after timeout
[Thu Oct 22 08:55:54 2020] DMAR: DRHD: handling fault status reg 102
[Thu Oct 22 08:55:54 2020] DMAR: [INTR-REMAP] Request device [42:00.2] fault index 1600 [fault reason 37] Blocked a compatibility format interrupt request

If you have any idea Ziyad and Itay can run any debugging you like.

I suppose it is because this series is handing out compatability
addr/data pairs while the IOMMU is setup to only accept remap ones
from SRIOV VFs?

Thanks,
Jason