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782e6769c0
Add a new dma_map_ops implementation that uses dma-direct for the address mapping of streaming mappings, and which requires arch-specific implemenations of coherent allocate/free. Architectures have to provide flushing helpers to ownership trasnfers to the device and/or CPU, and can provide optional implementations of the coherent mmap functionality, and the cache_flush routines for non-coherent long term allocations. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Alexey Brodkin <abrodkin@synopsys.com> Acked-by: Vineet Gupta <vgupta@synopsys.com>
19 lines
547 B
C
19 lines
547 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_GENERIC_DMA_MAPPING_H
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#define _ASM_GENERIC_DMA_MAPPING_H
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static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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{
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/*
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* Use the non-coherent ops if available. If an architecture wants a
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* more fine-grained selection of operations it will have to implement
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* get_arch_dma_ops itself or use the per-device dma_ops.
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*/
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#ifdef CONFIG_DMA_NONCOHERENT_OPS
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return &dma_noncoherent_ops;
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#else
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return &dma_direct_ops;
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#endif
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}
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#endif /* _ASM_GENERIC_DMA_MAPPING_H */
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