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

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Date:	Thu, 18 Jul 2013 16:45:54 +0300
From:	Thomas Backlund <tmb@...eia.org>
To:	Neil Horman <nhorman@...driver.com>
CC:	Kamal Mostafa <kamal@...onical.com>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, kernel-team@...ts.ubuntu.com,
	Prarit Bhargava <prarit@...hat.com>,
	Don Zickus <dzickus@...hat.com>,
	Don Dutile <ddutile@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Asit Mallick <asit.k.mallick@...el.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-pci@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Arkadiusz Miśkiewicz <arekm@...en.pl>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: Re: [PATCH 089/145] iommu/vt-d: add quirk for broken interrupt remapping
 on 55XX chipsets

18.07.2013 13:37, Neil Horman skrev:
> 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@...driver.com>
>>>
>>> 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@...driver.com>
>>> CC: Prarit Bhargava <prarit@...hat.com>
>>> CC: Don Zickus <dzickus@...hat.com>
>>> CC: Don Dutile <ddutile@...hat.com>
>>> CC: Bjorn Helgaas <bhelgaas@...gle.com>
>>> CC: Asit Mallick <asit.k.mallick@...el.com>
>>> CC: David Woodhouse <dwmw2@...radead.org>
>>> CC: linux-pci@...r.kernel.org
>>> CC: Joerg Roedel <joro@...tes.org>
>>> CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
>>> CC: Arkadiusz Miśkiewicz <arekm@...en.pl>
>>> Signed-off-by: Joerg Roedel <joro@...tes.org>
>>> Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
>>> ---
>>>   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: ”struct irq_data” deklarerad inuti parameterlista
>> [aktiverat som standard]
>> /kernel/linux-3.8.13.5/arch/x86/include/asm/irq_remapping.h:46:10:
>> varning: dess scope-område är endast denna definition eller
>> deklaration, vilket troligen inte är vad du vill. [aktiverat som
>> standard]
>> /kernel/linux-3.8.13.5/arch/x86/include/asm/irq_remapping.h:50:17:
>> varning: ”struct msi_msg” deklarerad inuti parameterlista [aktiverat
>> som standard]
>>
>>
>> You need to add this upstream fix too:
>>
>> commit 35d3d814cbd46a85bed97cd74ba97fbbb51e0ccd
>> Author: Joerg Roedel <joro@...tes.org>
>> 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

Almost, but not enough...

The patch you refer to was:
[3.9 stable PATCH] iommu/vt-d: add quirk for broken interrupt remapping 
on 55XX chipsets

and got merged in 3.9.9.

And that added a missing: "#include <linux/irq.h>" in
arch/x86/include/asm/irq_remapping.h

But using that patch it still spits out:

kernel/linux-3.8.13.5/arch/x86/include/asm/irq_remapping.h:50:17:
 >> varning: ”struct msi_msg” deklarerad inuti parameterlista [aktiverat
 >> som standard]


which is why the additional patch is still needed...

--

Thomas


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