Commit b4bbb107 authored by Thierry Reding's avatar Thierry Reding Committed by Marek Szyprowski
Browse files

dma-mapping: Provide write-combine allocations 



Provide an implementation for dma_{alloc,free,mmap}_writecombine() when
the architecture supports DMA attributes.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
parent 90114d65

arch/arm/include/asm/dma-mapping.h

+0 −16
Original line number Diff line number Diff line
@@ -265,22 +265,6 @@ extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma, 
			void *cpu_addr, dma_addr_t dma_addr, size_t size,

			struct dma_attrs *attrs);



static inline void *dma_alloc_writecombine(struct device *dev, size_t size,

				       dma_addr_t *dma_handle, gfp_t flag)

{

	DEFINE_DMA_ATTRS(attrs);

	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);

	return dma_alloc_attrs(dev, size, dma_handle, flag, &attrs);

}



static inline void dma_free_writecombine(struct device *dev, size_t size,

				     void *cpu_addr, dma_addr_t dma_handle)

{

	DEFINE_DMA_ATTRS(attrs);

	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);

	return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);

}



/*

 * This can be called during early boot to increase the size of the atomic

 * coherent DMA pool above the default value of 256KiB. It must be called

include/asm-generic/dma-mapping-common.h

+0 −8
Original line number Diff line number Diff line
@@ -205,14 +205,6 @@ dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, 


#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL)



static inline int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma,

		      void *cpu_addr, dma_addr_t dma_addr, size_t size)

{

	DEFINE_DMA_ATTRS(attrs);

	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);

	return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);

}



int

dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,

		       void *cpu_addr, dma_addr_t dma_addr, size_t size);

include/linux/dma-mapping.h

+26 −0
Original line number Diff line number Diff line
@@ -263,6 +263,32 @@ struct dma_attrs; 
#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \

	dma_unmap_sg(dev, sgl, nents, dir)



#else

static inline void *dma_alloc_writecombine(struct device *dev, size_t size,

					   dma_addr_t *dma_addr, gfp_t gfp)

{

	DEFINE_DMA_ATTRS(attrs);

	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);

	return dma_alloc_attrs(dev, size, dma_addr, gfp, &attrs);

}



static inline void dma_free_writecombine(struct device *dev, size_t size,

					 void *cpu_addr, dma_addr_t dma_addr)

{

	DEFINE_DMA_ATTRS(attrs);

	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);

	return dma_free_attrs(dev, size, cpu_addr, dma_addr, &attrs);

}



static inline int dma_mmap_writecombine(struct device *dev,

					struct vm_area_struct *vma,

					void *cpu_addr, dma_addr_t dma_addr,

					size_t size)

{

	DEFINE_DMA_ATTRS(attrs);

	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);

	return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);

}

#endif /* CONFIG_HAVE_DMA_ATTRS */



#ifdef CONFIG_NEED_DMA_MAP_STATE

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