diff --git a/Documentation/DMA-attributes.txt b/Documentation/DMA-attributes.txt
index d62d0c6a236..019b476f56c 100644
--- a/Documentation/DMA-attributes.txt
+++ b/Documentation/DMA-attributes.txt
@@ -76,3 +76,28 @@ of mapping (no unaligned accesses, no re-ordering, no write merging, no
 buffering, no pre-fetching). This has severe performance penalties and
 should not be used for general purpose DMA allocations. It should only
 be used if one of the restrictions on strongly ordered memory is required.
+
+DMA_ATTR_SKIP_CPU_SYNC
+----------------------
+
+By default dma_map_{single,page,sg} functions family transfer a given
+buffer from CPU domain to device domain. Some advanced use cases might
+require sharing a buffer between more than one device. This requires
+having a mapping created separately for each device and is usually
+performed by calling dma_map_{single,page,sg} function more than once
+for the given buffer with device pointer to each device taking part in
+the buffer sharing. The first call transfers a buffer from 'CPU' domain
+to 'device' domain, what synchronizes CPU caches for the given region
+(usually it means that the cache has been flushed or invalidated
+depending on the dma direction). However, next calls to
+dma_map_{single,page,sg}() for other devices will perform exactly the
+same sychronization operation on the CPU cache. CPU cache sychronization
+might be a time consuming operation, especially if the buffers are
+large, so it is highly recommended to avoid it if possible.
+DMA_ATTR_SKIP_CPU_SYNC allows platform code to skip synchronization of
+the CPU cache for the given buffer assuming that it has been already
+transferred to 'device' domain. This attribute can be also used for
+dma_unmap_{single,page,sg} functions family to force buffer to stay in
+device domain after releasing a mapping for it. Use this attribute with
+care!
+
diff --git a/include/linux/dma-attrs.h b/include/linux/dma-attrs.h
index 74f6714663e..6c847e63721 100644
--- a/include/linux/dma-attrs.h
+++ b/include/linux/dma-attrs.h
@@ -18,6 +18,7 @@ enum dma_attr {
 	DMA_ATTR_NO_KERNEL_MAPPING,
 	DMA_ATTR_STRONGLY_ORDERED,
 	DMA_ATTR_SKIP_ZEROING,
+	DMA_ATTR_SKIP_CPU_SYNC,
 	DMA_ATTR_MAX,
 };