Re: [PATCH 089/145] iommu/vt-d: add quirk for broken interruptremapping on 55XX chipsets

[Neil Horman]

On Thu, Jul 18, 2013 at 11:02:00AM +0300, Thomas Backlund wrote:
> 18.07.2013 01:47, Kamal Mostafa skrev:
> >3.8.13.5 -stable review patch.  If anyone has any objections, please let me know.
> >
> >------------------
> >
> >From: Neil Horman <nhorman@xxxxxxxxxxxxx>
> >
> >commit 03bbcb2e7e292838bb0244f5a7816d194c911d62 upstream.
> >
> >A few years back intel published a spec update:
> >http://www.intel.com/content/dam/doc/specification-update/5520-and-5500-chipset-ioh-specification-update.pdf
> >
> >For the 5520 and 5500 chipsets which contained an errata (specificially errata
> >53), which noted that these chipsets can't properly do interrupt remapping, and
> >as a result the recommend that interrupt remapping be disabled in bios.  While
> >many vendors have a bios update to do exactly that, not all do, and of course
> >not all users update their bios to a level that corrects the problem.  As a
> >result, occasionally interrupts can arrive at a cpu even after affinity for that
> >interrupt has be moved, leading to lost or spurrious interrupts (usually
> >characterized by the message:
> >kernel: do_IRQ: 7.71 No irq handler for vector (irq -1)
> >
> >There have been several incidents recently of people seeing this error, and
> >investigation has shown that they have system for which their BIOS level is such
> >that this feature was not properly turned off.  As such, it would be good to
> >give them a reminder that their systems are vulnurable to this problem.  For
> >details of those that reported the problem, please see:
> >https://bugzilla.redhat.com/show_bug.cgi?id=887006
> >
> >[ Joerg: Removed CONFIG_IRQ_REMAP ifdef from early-quirks.c ]
> >
> >Signed-off-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
> >CC: Prarit Bhargava <prarit@xxxxxxxxxx>
> >CC: Don Zickus <dzickus@xxxxxxxxxx>
> >CC: Don Dutile <ddutile@xxxxxxxxxx>
> >CC: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> >CC: Asit Mallick <asit.k.mallick@xxxxxxxxx>
> >CC: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
> >CC: linux-pci@xxxxxxxxxxxxxxx
> >CC: Joerg Roedel <joro@xxxxxxxxxx>
> >CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> >CC: Arkadiusz MiÅkiewicz <arekm@xxxxxxxx>
> >Signed-off-by: Joerg Roedel <joro@xxxxxxxxxx>
> >Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
> >---
> >  arch/x86/include/asm/irq_remapping.h |  2 ++
> >  arch/x86/kernel/early-quirks.c       | 20 ++++++++++++++++++++
> >  drivers/iommu/intel_irq_remapping.c  | 10 ++++++++++
> >  drivers/iommu/irq_remapping.c        |  6 ++++++
> >  drivers/iommu/irq_remapping.h        |  2 ++
> >  5 files changed, 40 insertions(+)
> >
> 
> This patch introduces this warning on 3.8 series kernels:
> 
> In file included from arch/x86/kernel/early-quirks.c:21:0:
> /kernel/linux-3.8.13.5/arch/x86/include/asm/irq_remapping.h:46:10:
> varning: âstruct irq_dataâ deklarerad inuti parameterlista
> [aktiverat som standard]
> /kernel/linux-3.8.13.5/arch/x86/include/asm/irq_remapping.h:46:10:
> varning: dess scope-omrÃde Ãr endast denna definition eller
> deklaration, vilket troligen inte Ãr vad du vill. [aktiverat som
> standard]
> /kernel/linux-3.8.13.5/arch/x86/include/asm/irq_remapping.h:50:17:
> varning: âstruct msi_msgâ deklarerad inuti parameterlista [aktiverat
> som standard]
> 
> 
> You need to add this upstream fix too:
> 
> commit 35d3d814cbd46a85bed97cd74ba97fbbb51e0ccd
> Author: Joerg Roedel <joro@xxxxxxxxxx>
> Date:   Fri Apr 19 20:34:55 2013 +0200
> 
>     iommu: Fix compile warnings with forward declarations
> 
I submited a 3.9 backport that included that fix to -stable over a week ago, you
should just be able to use that if you want.
Neil

> 
> --
> 
> Thomas
> 
> 
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