diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index c62fc4e78cdb..fe87f565768e 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -771,6 +771,10 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 void dma_release_declared_memory(struct device *dev);
 void *dma_mark_declared_memory_occupied(struct device *dev,
 					dma_addr_t device_addr, size_t size);
+dma_addr_t dma_get_device_base(struct device *dev,
+			       struct dma_coherent_mem *mem);
+unsigned long dma_get_size(struct dma_coherent_mem *mem);
+
 #else
 static inline int
 dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
@@ -790,6 +794,17 @@ dma_mark_declared_memory_occupied(struct device *dev,
 {
 	return ERR_PTR(-EBUSY);
 }
+static inline dma_addr_t
+dma_get_device_base(struct device *dev, struct dma_coherent_mem *mem)
+{
+	return 0;
+}
+
+static inline unsigned long dma_get_size(struct dma_coherent_mem *mem)
+{
+	return 0;
+}
+
 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 
 #ifdef CONFIG_HAS_DMA
diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c
index 597d40893862..83e48618b6ca 100644
--- a/kernel/dma/coherent.c
+++ b/kernel/dma/coherent.c
@@ -29,14 +29,21 @@ static inline struct dma_coherent_mem *dev_get_coherent_memory(struct device *de
 	return NULL;
 }
 
-static inline dma_addr_t dma_get_device_base(struct device *dev,
-					     struct dma_coherent_mem * mem)
+dma_addr_t dma_get_device_base(struct device *dev,
+			       struct dma_coherent_mem *mem)
 {
 	if (mem->use_dev_dma_pfn_offset)
 		return (mem->pfn_base - dev->dma_pfn_offset) << PAGE_SHIFT;
 	else
 		return mem->device_base;
 }
+EXPORT_SYMBOL_GPL(dma_get_device_base);
+
+unsigned long dma_get_size(struct dma_coherent_mem *mem)
+{
+	return mem->size << PAGE_SHIFT;
+}
+EXPORT_SYMBOL_GPL(dma_get_size);
 
 static int dma_init_coherent_memory(
 	phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags,