1 files changed, 9 insertions, 0 deletions

diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index 5d90074dca75..75dbda03f4fb 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -79,3 +79,12 @@ void iommu_area_free(unsigned long *map, unsigned long start, unsigned int nr)
         }
 }
 EXPORT_SYMBOL(iommu_area_free);
+
+unsigned long iommu_num_pages(unsigned long addr, unsigned long len,
+                              unsigned long io_page_size)
+{
+        unsigned long size = (addr & (io_page_size - 1)) + len;
+
+        return DIV_ROUND_UP(size, io_page_size);
+}
+EXPORT_SYMBOL(iommu_num_pages);