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Date: Fri, 11 May 2012 16:38:21 -0700 From: Greg KH <gregkh@...uxfoundation.org> To: Alex Williamson <alex.williamson@...hat.com> Cc: benh@...nel.crashing.org, aik@...abs.ru, david@...son.dropbear.id.au, joerg.roedel@....com, dwmw2@...radead.org, chrisw@...s-sol.org, agraf@...e.de, benve@...co.com, aafabbri@...co.com, B08248@...escale.com, B07421@...escale.com, avi@...hat.com, konrad.wilk@...cle.com, kvm@...r.kernel.org, qemu-devel@...gnu.org, iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, bhelgaas@...gle.com Subject: Re: [PATCH 01/13] driver core: Add iommu_group tracking to struct device 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.williamson@...hat.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? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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