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drivers: dma-coherent: Introduce default DMA pool

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This patch introduces default coherent DMA pool similar to default CMA
area concept. To keep other users safe code kept under CONFIG_ARM.

Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Tested-by: Andras Szemzo <sza@esh.hu>
Tested-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Vladimir Murzin
2017-06-26 10:18:58 +01:00
committed by Christoph Hellwig
parent c41f9ea998
commit 93228b44c3
2 changed files with 55 additions and 7 deletions
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3
Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
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@@ -68,6 +68,9 @@ Linux implementation note:
- If a "linux,cma-default" property is present, then Linux will use the
region for the default pool of the contiguous memory allocator.
- If a "linux,dma-default" property is present, then Linux will use the
region for the default pool of the consistent DMA allocator.
Device node references to reserved memory
-----------------------------------------
Regions in the /reserved-memory node may be referenced by other device