Re: [PATCH v9] irq: add quirk for broken interrupt remapping on 55XXchipsets

[Neil Horman]

On Tue, Apr 16, 2013 at 06:37:05PM +0200, Joerg Roedel wrote:
> On Tue, Apr 16, 2013 at 09:35:56AM -0400, Neil Horman wrote:
> > Actually, hold on that last note, the intel iommu init code doesn't seem to
> > create any direct relationship between the set of iommu's and the pci_dev's that
> > implement them.  In the intel_irq_remapping_supported path I can loop over each
> > dmar_dhrd_unit, and interrogate each of the devices on its **devices list to see
> > if the device/vendor and revision ids match, but looking at the dhrd parsing
> > code, I'm not sure the iommu pci_dev is always going to be on that list.  That
> > seems like its going to be pretty ugly in and of itself.  Do you have a
> > suggested way to identify the pci_dev of the device we need in that path without
> > having to simply iterate over every device in that scope?
> 
> Hmkay, looks like this is a non-trivial problem. Here is what I suggest:
> Keep the early-quirk as in your current patch. But add a function to
> drivers/iommu/irq_remapping.c to disable irq-remapping and export that
> function via the header-file arch/x86/include/asm/irq_remapping.h. Use
> that function in the quirk instead of setting the disable-flag directly.
> This way you don't have to include any private header file from iommu
> code.
> 
Ok, that seems reasonable. I'll have a new patch in a day or so.

Thanks!
Neil

--
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/