On Fri, 2012-05-11 at 16:38 -0700, Greg KH wrote: > On Fri, May 11, 2012 at 04:55:35PM -0600, Alex Williamson wrote: > > IOMMU groups allow IOMMU drivers to represent DMA visibility > > and isolation of devices. Multiple devices may be grouped > > together for the purposes of DMA. Placing a pointer on > > struct device enable easy access for things like streaming > > DMA programming and drivers like VFIO. > > > > Signed-off-by: Alex Williamson <alex.william...@redhat.com> > > Can't you get this today from the iommu_ops pointer that is on the bus > that the device is associated with? Or can devices on a bus have > different iommu_group pointers?
The latter, each device on a bus might be it's own group. This is often the case on x86 unless PCIe-to-PCI bridges obscure the device visibility. Thanks, Alex _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
