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Date:	Thu, 4 Apr 2013 14:11:54 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	Don Dutile <ddutile@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Prarit Bhargava <prarit@...hat.com>,
	Don Zickus <dzickus@...hat.com>,
	Asit Mallick <asit.k.mallick@...el.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v4] irq: add quirk for broken interrupt remapping on 55XX chipsets

On Thu, Apr 4, 2013 at 1:33 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> See my last email to Bjorn.  Doing this in early-quirks in such a way that we
>> can detect an iommu that has interrupt remapping enabled (so we don't just
>> unilaterally print this quirk all the time) requires that we be able to parse
>> acpi tables very early in the boot.  If you know of how to do that, I can make
>> this happen.  If not, I suppose another alternative would be to have the early
>> quirk set a flag that tells us this is a bogus chip, and if we try to enable irq
>> remapping with that flag set, we should fail, and report the error at that time,
>> but I'm not sure I like that solution.
>
> I like that solution :)  It seems very simple -- you don't have to
> parse any tables or anything.

You are right, we don't need to parse any acpi tables.

just add one quirk in early-quirk.c to set
   disable_irq_remap = 1;

Thanks

Yinghai
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