iommu/dma: remove most stubs in iommu-dma.h

The direct calls from mapping.c all guarded by use_dma_iommu(), so don't
bother to provide stubs, but instead just expose the prototypes
unconditionally.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Leon Romanovsky <leon@kernel.org>

include/linux/iommu-dma.h

@@ -14,6 +14,13 @@ static inline bool use_dma_iommu(struct device *dev)
 {
 	return dev->dma_iommu;
 }
+#else
+static inline bool use_dma_iommu(struct device *dev)
+{
+	return false;
+}
+#endif /* CONFIG_IOMMU_DMA */
+
 dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
 		unsigned long offset, size_t size, enum dma_data_direction dir,
 		unsigned long attrs);
@@ -58,104 +65,5 @@ void iommu_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
 		int nelems, enum dma_data_direction dir);
 void iommu_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
 		int nelems, enum dma_data_direction dir);
-#else
-static inline bool use_dma_iommu(struct device *dev)
-{
-	return false;
-}
-static inline dma_addr_t iommu_dma_map_page(struct device *dev,
-		struct page *page, unsigned long offset, size_t size,
-		enum dma_data_direction dir, unsigned long attrs)
-{
-	return DMA_MAPPING_ERROR;
-}
-static inline void iommu_dma_unmap_page(struct device *dev,
-		dma_addr_t dma_handle, size_t size, enum dma_data_direction dir,
-		unsigned long attrs)
-{
-}
-static inline int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
-		int nents, enum dma_data_direction dir, unsigned long attrs)
-{
-	return -EINVAL;
-}
-static inline void iommu_dma_unmap_sg(struct device *dev,
-		struct scatterlist *sg, int nents, enum dma_data_direction dir,
-		unsigned long attrs)
-{
-}
-static inline void *iommu_dma_alloc(struct device *dev, size_t size,
-		dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
-{
-	return NULL;
-}
-static inline int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
-		void *cpu_addr, dma_addr_t dma_addr, size_t size,
-		unsigned long attrs)
-{
-	return -EINVAL;
-}
-static inline int iommu_dma_get_sgtable(struct device *dev,
-		struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr,
-		size_t size, unsigned long attrs)
-{
-	return -EINVAL;
-}
-static inline unsigned long iommu_dma_get_merge_boundary(struct device *dev)
-{
-	return 0;
-}
-static inline size_t iommu_dma_opt_mapping_size(void)
-{
-	return 0;
-}
-static inline size_t iommu_dma_max_mapping_size(struct device *dev)
-{
-	return 0;
-}
-static inline void iommu_dma_free(struct device *dev, size_t size,
-		void *cpu_addr, dma_addr_t handle, unsigned long attrs)
-{
-}
-static inline dma_addr_t iommu_dma_map_resource(struct device *dev,
-		phys_addr_t phys, size_t size, enum dma_data_direction dir,
-		unsigned long attrs)
-{
-	return DMA_MAPPING_ERROR;
-}
-static inline void iommu_dma_unmap_resource(struct device *dev,
-		dma_addr_t handle, size_t size, enum dma_data_direction dir,
-		unsigned long attrs)
-{
-}
-static inline struct sg_table *
-iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
-		enum dma_data_direction dir, gfp_t gfp, unsigned long attrs)
-{
-	return NULL;
-}
-static inline void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
-		struct sg_table *sgt, enum dma_data_direction dir)
-{
-}
-static inline void iommu_dma_sync_single_for_cpu(struct device *dev,
-		dma_addr_t dma_handle, size_t size,
-		enum dma_data_direction dir)
-{
-}
-static inline void iommu_dma_sync_single_for_device(struct device *dev,
-		dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
-{
-}
-static inline void iommu_dma_sync_sg_for_cpu(struct device *dev,
-		struct scatterlist *sgl, int nelems,
-		enum dma_data_direction dir)
-{
-}
-static inline void iommu_dma_sync_sg_for_device(struct device *dev,
-		struct scatterlist *sgl, int nelems,
-		enum dma_data_direction dir)
-{
-}
-#endif /* CONFIG_IOMMU_DMA */
+
 #endif /* _LINUX_IOMMU_DMA_H */