1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h
index c975caf75385..3b068e5b5671 100644
--- a/include/linux/iommu-helper.h
+++ b/include/linux/iommu-helper.h
@@ -1,6 +1,20 @@
+#ifndef _LINUX_IOMMU_HELPER_H
+#define _LINUX_IOMMU_HELPER_H
+
+static inline unsigned long iommu_device_max_index(unsigned long size,
+                                                   unsigned long offset,
+                                                   u64 dma_mask)
+{
+        if (size + offset > dma_mask)
+                return dma_mask - offset + 1;
+        else
+                return size;
+}
+
 extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
                                   unsigned long shift,
                                   unsigned long boundary_size);
+extern void iommu_area_reserve(unsigned long *map, unsigned long i, int len);
 extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
                                       unsigned long start, unsigned int nr,
                                       unsigned long shift,
@@ -8,3 +22,8 @@ extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
                                       unsigned long align_mask);
 extern void iommu_area_free(unsigned long *map, unsigned long start,
                             unsigned int nr);
+
+extern unsigned long iommu_num_pages(unsigned long addr, unsigned long len,
+                                     unsigned long io_page_size);
+
+#endif