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

[Woodhouse, David]

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?

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David Woodhouse                            Open Source Technology Centre
David.Woodhouse@xxxxxxxxx                              Intel Corporation

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