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

[Thomas Backlund]

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


--

Thomas

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