Re: [PATCH v4] irq: add quirk for broken interrupt remapping on 55XX chipsets

[Yinghai Lu]

On Thu, Apr 4, 2013 at 1:33 PM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/