commit 8f68f8e28298abdf518648e794c71e534eb8841c
author Will Deacon <will.deacon@arm.com> Tue Jul 15 11:27:08 2014 +0100
committer Will Deacon <will.deacon@arm.com> Tue Sep 16 19:14:16 2014 +0100
tree b84a1dd2233efcda165e48446f81e564d636ce1e
parent 4cf740b0b6628bda1e5c9201ae0d4f56fc6c06a5

iommu/arm-smmu: add support for multi-master iommu groups

Whilst the driver currently creates one IOMMU group per device, this
will soon change when we start supporting non-transparent PCI bridges
which require all upstream masters to be assigned to the same address
space.

This patch reworks our IOMMU group code so that we can easily support
multi-master groups. The master configuration (streamids and smrs) is
stored as private iommudata on the group, whilst the low-level attach/detach
code is updated to avoid double alloc/free when dealing with multiple
masters sharing the same SMMU configuration. This unifies device
handling, regardless of whether the device sits on the platform or pci
bus.

Signed-off-by: Will Deacon <will.deacon@arm.com>