On Tue, Jan 27, 2015 at 01:08:57AM +0100, Joerg Roedel wrote: > From: Joerg Roedel <[email protected]> > > This patch changes the behavior of the iommu_attach_device > and iommu_detach_device functions. With this change these > functions only work on devices that have their own group. > For all other devices the iommu_group_attach/detach > functions must be used. > > Signed-off-by: Joerg Roedel <[email protected]> > --- > drivers/iommu/iommu.c | 63 > +++++++++++++++++++++++++++++++++++++++++++++++---- > 1 file changed, 59 insertions(+), 4 deletions(-)
Sorry for my ignorance, but I don't understand what IOMMU groups are supposed to be or how to make use of them. It seems like a common idiom is to simply allocate a new group and add a device to it in the IOMMU's ->add_device() callback, but I fail to see the reason for that. Can anybody point me to documentation about this? I've looked and I did not find anything. Thierry
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