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Commit 613c4578 authored by Marek Szyprowski's avatar Marek Szyprowski
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common: dma-mapping: introduce generic alloc() and free() methods 



Introduce new generic alloc and free methods with attributes argument.

Existing alloc_coherent and free_coherent can be implemented on top of the
new calls with NULL attributes argument. Later also dma_alloc_non_coherent
can be implemented using DMA_ATTR_NONCOHERENT attribute as well as
dma_alloc_writecombine with separate DMA_ATTR_WRITECOMBINE attribute.

This way the drivers will get more generic, platform independent way of
allocating dma buffers with specific parameters.

Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Acked-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.ud.au>
Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
parent c16fa4f2

include/linux/dma-mapping.h

+6 −0
Original line number Diff line number Diff line
@@ -13,6 +13,12 @@ struct dma_map_ops { 
				dma_addr_t *dma_handle, gfp_t gfp);

	void (*free_coherent)(struct device *dev, size_t size,

			      void *vaddr, dma_addr_t dma_handle);

	void* (*alloc)(struct device *dev, size_t size,

				dma_addr_t *dma_handle, gfp_t gfp,

				struct dma_attrs *attrs);

	void (*free)(struct device *dev, size_t size,

			      void *vaddr, dma_addr_t dma_handle,

			      struct dma_attrs *attrs);

	dma_addr_t (*map_page)(struct device *dev, struct page *page,

			       unsigned long offset, size_t size,

			       enum dma_data_direction dir,