1 files changed, 12 insertions, 13 deletions

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 20f9a527922a..379a6179fd96 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:
@@ -94,7 +97,6 @@ enum iommu_attr {
  * @map: map a physically contiguous memory region to an iommu domain
  * @unmap: unmap a physically contiguous memory region from an iommu domain
  * @iova_to_phys: translate iova to physical address
- * @domain_has_cap: domain capabilities query
  * @add_device: add device to iommu grouping
  * @remove_device: remove device from iommu grouping
  * @domain_get_attr: Query domain attributes
@@ -102,6 +104,7 @@ enum iommu_attr {
  * @pgsize_bitmap: bitmap of supported page sizes
  */
 struct iommu_ops {
+        bool (*capable)(enum iommu_cap);
         int (*domain_init)(struct iommu_domain *domain);
         void (*domain_destroy)(struct iommu_domain *domain);
         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
@@ -111,8 +114,6 @@ struct iommu_ops {
         size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
                      size_t size);
         phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
-        int (*domain_has_cap)(struct iommu_domain *domain,
-                              unsigned long cap);
         int (*add_device)(struct device *dev);
         void (*remove_device)(struct device *dev);
         int (*device_group)(struct device *dev, unsigned int *groupid);
@@ -142,6 +143,7 @@ struct iommu_ops {
 
 extern int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops);
 extern bool iommu_present(struct bus_type *bus);
+extern bool iommu_capable(struct bus_type *bus, enum iommu_cap cap);
 extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus);
 extern struct iommu_group *iommu_group_get_by_id(int id);
 extern void iommu_domain_free(struct iommu_domain *domain);
@@ -154,8 +156,6 @@ extern int iommu_map(struct iommu_domain *domain, unsigned long iova,
 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);
 extern void iommu_set_fault_handler(struct iommu_domain *domain,
                         iommu_fault_handler_t handler, void *token);
 
@@ -250,6 +250,11 @@ static inline bool iommu_present(struct bus_type *bus)
         return false;
 }
 
+static inline bool iommu_capable(struct bus_type *bus, enum iommu_cap cap)
+{
+        return false;
+}
+
 static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 {
         return NULL;
@@ -304,12 +309,6 @@ static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_ad
         return 0;
 }
 
-static inline int iommu_domain_has_cap(struct iommu_domain *domain,
-                                       unsigned long cap)
-{
-        return 0;
-}
-
 static inline void iommu_set_fault_handler(struct iommu_domain *domain,
                                 iommu_fault_handler_t handler, void *token)
 {