powerpc/vfio: Implement IOMMU driver for VFIO

VFIO implements platform independent stuff such as
a PCI driver, BAR access (via read/write on a file descriptor
or direct mapping when possible) and IRQ signaling.

The platform dependent part includes IOMMU initialization
and handling.  This implements an IOMMU driver for VFIO
which does mapping/unmapping pages for the guest IO and
provides information about DMA window (required by a POWER
guest).

Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
index 7cd5dec0abd1..b464687f6e14 100644
--- a/drivers/vfio/Kconfig
+++ b/drivers/vfio/Kconfig
@@ -3,10 +3,16 @@ config VFIO_IOMMU_TYPE1
         depends on VFIO
         default n
 
+config VFIO_IOMMU_SPAPR_TCE
+        tristate
+        depends on VFIO && SPAPR_TCE_IOMMU
+        default n
+
 menuconfig VFIO
         tristate "VFIO Non-Privileged userspace driver framework"
         depends on IOMMU_API
         select VFIO_IOMMU_TYPE1 if X86
+        select VFIO_IOMMU_SPAPR_TCE if PPC_POWERNV
         help
           VFIO provides a framework for secure userspace device drivers.
           See Documentation/vfio.txt for more details.