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