iommu: Convert iommu-caps from define to enum

Allow compile-time type-checking.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 7 insertions, 4 deletions

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 20f9a527922a..98fc126655ae 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -57,8 +57,11 @@ struct iommu_domain {
         struct iommu_domain_geometry geometry;
 };
 
-#define IOMMU_CAP_CACHE_COHERENCY       0x1
-#define IOMMU_CAP_INTR_REMAP            0x2     /* isolates device intrs */
+enum iommu_cap {
+        IOMMU_CAP_CACHE_COHERENCY,      /* IOMMU can enforce cache coherent DMA
+                                           transactions */
+        IOMMU_CAP_INTR_REMAP,           /* IOMMU supports interrupt isolation */
+};
 
 /*
  * Following constraints are specifc to FSL_PAMUV1:
@@ -155,7 +158,7 @@ extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova,
                        size_t size);
 extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
 extern int iommu_domain_has_cap(struct iommu_domain *domain,
-                                unsigned long cap);
+                                enum iommu_cap cap);
 extern void iommu_set_fault_handler(struct iommu_domain *domain,
                         iommu_fault_handler_t handler, void *token);
 
@@ -305,7 +308,7 @@ static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_ad
 }
 
 static inline int iommu_domain_has_cap(struct iommu_domain *domain,
-                                       unsigned long cap)
+                                       enum iommu_cap cap)
 {
         return 0;
 }