iommu: Pass in old domain to attach_dev callback functions

The IOMMU core attaches each device to a default domain on probe(). Then,
every new "attach" operation has a fundamental meaning of two-fold:
 - detach from its currently attached (old) domain
 - attach to a given new domain

Modern IOMMU drivers following this pattern usually want to clean up the
things related to the old domain, so they call iommu_get_domain_for_dev()
to fetch the old domain.

Pass in the old domain pointer from the core to drivers, aligning with the
set_dev_pasid op that does so already.

Ensure all low-level attach fcuntions in the core can forward the correct
old domain pointer. Thus, rework those functions as well.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index 1b6ad9c900a5..760d7aa2ade8 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -19,7 +19,7 @@
 #include "pasid.h"
 
 static int intel_nested_attach_dev(struct iommu_domain *domain,
-				   struct device *dev)
+				   struct device *dev, struct iommu_domain *old)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
 	struct dmar_domain *dmar_domain = to_dmar_domain(domain);