58b0440663
The only functional differences (modulo a few missing fixes in the arch code) is that architectures without coherent caches need a hook to convert a virtual or dma address into a pfn, given that we don't have the kernel linear mapping available for the otherwise easy virt_to_page call. As a side effect we can support mmap of the per-device coherent area even on architectures not providing the callback, and we make previous dangerous default methods dma_common_mmap actually save for non-coherent architectures by rejecting it without the right helper. In addition to that we need a hook so that some architectures can override the protection bits when mmaping a dma coherent allocations. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Paul Burton <paul.burton@mips.com> # MIPS parts
73 lines
2.2 KiB
C
73 lines
2.2 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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#ifdef CONFIG_ARCH_HAS_DMA_COHERENCE_H
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#include <asm/dma-coherence.h>
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#elif defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
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defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
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defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
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static inline bool dev_is_dma_coherent(struct device *dev)
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{
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return dev->dma_coherent;
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}
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#else
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static inline bool dev_is_dma_coherent(struct device *dev)
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{
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return true;
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}
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#endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_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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long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
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dma_addr_t dma_addr);
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#ifdef CONFIG_ARCH_HAS_DMA_MMAP_PGPROT
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pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
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unsigned long attrs);
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#else
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# define arch_dma_mmap_pgprot(dev, prot, attrs) pgprot_noncached(prot)
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#endif
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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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#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
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void arch_sync_dma_for_cpu_all(struct device *dev);
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#else
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static inline void arch_sync_dma_for_cpu_all(struct device *dev)
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{
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}
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#endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
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#endif /* _LINUX_DMA_NONCOHERENT_H */
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