common: DMA-mapping: Add EXEC_MAPPING attribute
DMA_ATTR_EXEC_MAPPING specifies that an executable mapping
should be created for the requested buffer. By default, the
DMA mappings are non-executable.
Change-Id: I135077e14996e92fa9d199bdee043c443db48924
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
diff --git a/Documentation/DMA-attributes.txt b/Documentation/DMA-attributes.txt
index c0b673c..95298e4 100644
--- a/Documentation/DMA-attributes.txt
+++ b/Documentation/DMA-attributes.txt
@@ -145,3 +145,10 @@
and can be re-used. By specifying this attribute, an additional reference
will NOT be held by the lazy mapping code and it will be released as soon
as the buffer is freed.
+
+DMA_ATTR_EXEC_MAPPING
+---------------------
+
+By default, the DMA mappings are non-executable. Some use cases might require
+an executable mapping. This attribute can be used to indicate to the DMA
+subsystem to create an executable mappings for the buffer.