bc3ec75de5
All the cache maintainance is already stubbed out when not enabled, but merging the two allows us to nicely handle the case where cache maintainance is required for some devices, but not others. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Paul Burton <paul.burton@mips.com> # MIPS parts
74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_DMA_DIRECT_H
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#define _LINUX_DMA_DIRECT_H 1
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#include <linux/dma-mapping.h>
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#include <linux/mem_encrypt.h>
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#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
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#include <asm/dma-direct.h>
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#else
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static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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dma_addr_t dev_addr = (dma_addr_t)paddr;
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return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
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}
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static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
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{
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phys_addr_t paddr = (phys_addr_t)dev_addr;
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return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
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}
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static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
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{
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if (!dev->dma_mask)
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return false;
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return addr + size - 1 <= *dev->dma_mask;
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}
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#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
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/*
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* If memory encryption is supported, phys_to_dma will set the memory encryption
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* bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
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* and __dma_to_phys versions should only be used on non-encrypted memory for
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* special occasions like DMA coherent buffers.
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*/
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static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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{
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return __sme_set(__phys_to_dma(dev, paddr));
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}
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static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
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{
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return __sme_clr(__dma_to_phys(dev, daddr));
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}
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#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
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void dma_mark_clean(void *addr, size_t size);
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#else
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static inline void dma_mark_clean(void *addr, size_t size)
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{
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}
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#endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
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void *dma_direct_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 dma_direct_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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void *dma_direct_alloc_pages(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
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void dma_direct_free_pages(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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dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size, enum dma_data_direction dir,
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unsigned long attrs);
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int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
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enum dma_data_direction dir, unsigned long attrs);
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int dma_direct_supported(struct device *dev, u64 mask);
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int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr);
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#endif /* _LINUX_DMA_DIRECT_H */
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