1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 3aeb7305e2f5..7ea319e95b47 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -58,10 +58,26 @@ struct iommu_domain {
 #define IOMMU_CAP_CACHE_COHERENCY       0x1
 #define IOMMU_CAP_INTR_REMAP            0x2     /* isolates device intrs */
 
+/*
+ * Following constraints are specifc to FSL_PAMUV1:
+ *  -aperture must be power of 2, and naturally aligned
+ *  -number of windows must be power of 2, and address space size
+ *   of each window is determined by aperture size / # of windows
+ *  -the actual size of the mapped region of a window must be power
+ *   of 2 starting with 4KB and physical address must be naturally
+ *   aligned.
+ * DOMAIN_ATTR_FSL_PAMUV1 corresponds to the above mentioned contraints.
+ * The caller can invoke iommu_domain_get_attr to check if the underlying
+ * iommu implementation supports these constraints.
+ */
+
 enum iommu_attr {
         DOMAIN_ATTR_GEOMETRY,
         DOMAIN_ATTR_PAGING,
         DOMAIN_ATTR_WINDOWS,
+        DOMAIN_ATTR_FSL_PAMU_STASH,
+        DOMAIN_ATTR_FSL_PAMU_ENABLE,
+        DOMAIN_ATTR_FSL_PAMUV1,
         DOMAIN_ATTR_MAX,
 };