iommu/vt-d: Move domain helper to header

Move domain helper to header to be used by SVA code.

Signed-off-by: Jacob Pan <[email protected]>
Signed-off-by: Lu Baolu <[email protected]>
Reviewed-by: Eric Auger <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 980234ae0312..ed7171d2ae1f 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -595,6 +595,12 @@ static inline void __iommu_flush_cache(
 		clflush_cache_range(addr, size);
 }
 
+/* Convert generic struct iommu_domain to private struct dmar_domain */
+static inline struct dmar_domain *to_dmar_domain(struct iommu_domain *dom)
+{
+	return container_of(dom, struct dmar_domain, domain);
+}
+
 /*
  * 0: readable
  * 1: writable