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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>
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_DMA_NONCOHERENT_H
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#define _LINUX_DMA_NONCOHERENT_H 1
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#include <linux/dma-mapping.h>
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void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t gfp, unsigned long attrs);
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void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_addr, unsigned long attrs);
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#ifdef CONFIG_DMA_NONCOHERENT_MMAP
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int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs);
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#else
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#define arch_dma_mmap NULL
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#endif /* CONFIG_DMA_NONCOHERENT_MMAP */
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#ifdef CONFIG_DMA_NONCOHERENT_CACHE_SYNC
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void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction direction);
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#else
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#define arch_dma_cache_sync NULL
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#endif /* CONFIG_DMA_NONCOHERENT_CACHE_SYNC */
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#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE
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void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir);
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#else
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static inline void arch_sync_dma_for_device(struct device *dev,
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phys_addr_t paddr, size_t size, enum dma_data_direction dir)
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{
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}
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#endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */
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#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
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void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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size_t size, enum dma_data_direction dir);
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#else
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static inline void arch_sync_dma_for_cpu(struct device *dev,
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phys_addr_t paddr, size_t size, enum dma_data_direction dir)
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{
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}
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#endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */
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#endif /* _LINUX_DMA_NONCOHERENT_H */
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