Re: [PATCH 0/4] iommu: iommu_ops group interface

[Alex Williamson]

On Fri, 2011-10-21 at 20:34 +0000, Woodhouse, David wrote:
> On Fri, 2011-10-21 at 13:55 -0600, Alex Williamson wrote:
> > IOMMUs can't always distiguish transactions from each individual
> > device in a system.  Sometimes this is by design (such as powerpc
> > partitionable endpoints), other times by topology (PCIe-to-PCI
> > bridges masking downstream devices).  We call these sets of
> > indistinguishable devices "groups". 
> 
> Other times it's because a multi-function PCIe device is broken and does
> all its DMA from function zero.... like some Ricoh devices seen in
> laptops. Can you handle quirks to "group" those too?

I could add:

drivers/pci/quirks.c: int pci_iommu_group_mf_quirk(struct pci_dev *)

That's used just like iommu_group_mf to always blacklist specific
devices.  Let me know VID/DID if you have them.  Thanks,

Alex

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