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Commit cc3ff310 authored Jul 06, 2015 by Rohit Vaswani Committed by Patrick Daly Aug 24, 2016

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>

parent 679ede30

Documentation/DMA-attributes.txt

+7 −0

Original line number	Diff line number	Diff line
		@@ -145,3 +145,10 @@ reference so that when the buffer is freed, the mapping is not destroyed
		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.

include/linux/dma-mapping.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -72,6 +72,10 @@
		* is freed.
		*/
		#define DMA_ATTR_NO_DELAYED_UNMAP (1UL << 10)
		/*
		* DMA_ATTR_EXEC_MAPPING: The mapping has executable permissions.
		*/
		#define DMA_ATTR_EXEC_MAPPING (1UL << 11)

		/*
		* A dma_addr_t can hold any valid DMA or bus address for the platform.