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https://github.com/edk2-porting/linux-next.git
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3b9c6c11f5
Architectures implement dma_is_consistent() in different ways (some misinterpret the definition of API in DMA-API.txt). So it hasn't been so useful for drivers. We have only one user of the API in tree. Unlikely out-of-tree drivers use the API. Even if we fix dma_is_consistent() in some architectures, it doesn't look useful at all. It was invented long ago for some old systems that can't allocate coherent memory at all. It's better to export only APIs that are definitely necessary for drivers. Let's remove this API. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
#ifndef _ASM_GENERIC_DMA_MAPPING_H
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#define _ASM_GENERIC_DMA_MAPPING_H
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/* define the dma api to allow compilation but not linking of
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* dma dependent code. Code that depends on the dma-mapping
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* API needs to set 'depends on HAS_DMA' in its Kconfig
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*/
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struct scatterlist;
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extern void *
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dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t flag);
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extern void
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dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_handle);
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#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
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#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
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extern dma_addr_t
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dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction direction);
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extern void
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dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction direction);
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extern int
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dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction);
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extern void
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dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
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enum dma_data_direction direction);
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extern dma_addr_t
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dma_map_page(struct device *dev, struct page *page, unsigned long offset,
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size_t size, enum dma_data_direction direction);
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extern void
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dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
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enum dma_data_direction direction);
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extern void
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dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction);
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extern void
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dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size,
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enum dma_data_direction direction);
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extern void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction);
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#define dma_sync_single_for_device dma_sync_single_for_cpu
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#define dma_sync_single_range_for_device dma_sync_single_range_for_cpu
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#define dma_sync_sg_for_device dma_sync_sg_for_cpu
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extern int
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dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
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extern int
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dma_supported(struct device *dev, u64 mask);
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extern int
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dma_set_mask(struct device *dev, u64 mask);
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extern int
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dma_get_cache_alignment(void);
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extern void
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dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction direction);
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#endif /* _ASM_GENERIC_DMA_MAPPING_H */
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