Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_DMA_DIRECT_H
3#define _LINUX_DMA_DIRECT_H 1
4
5#include <linux/dma-mapping.h>
6#include <linux/mem_encrypt.h>
7
8#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
9#include <asm/dma-direct.h>
10#else
11static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
12{
13 dma_addr_t dev_addr = (dma_addr_t)paddr;
14
15 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
16}
17
18static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
19{
20 phys_addr_t paddr = (phys_addr_t)dev_addr;
21
22 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
23}
24
25static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
26{
27 if (!dev->dma_mask)
28 return false;
29
30 return addr + size - 1 <= *dev->dma_mask;
31}
32#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
33
34/*
35 * If memory encryption is supported, phys_to_dma will set the memory encryption
36 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
37 * and __dma_to_phys versions should only be used on non-encrypted memory for
38 * special occasions like DMA coherent buffers.
39 */
40static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
41{
42 return __sme_set(__phys_to_dma(dev, paddr));
43}
44
45static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
46{
47 return __sme_clr(__dma_to_phys(dev, daddr));
48}
49
50#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
51void dma_mark_clean(void *addr, size_t size);
52#else
53static inline void dma_mark_clean(void *addr, size_t size)
54{
55}
56#endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
57
58void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
59 gfp_t gfp, unsigned long attrs);
60void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
61 dma_addr_t dma_addr, unsigned long attrs);
62dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
63 unsigned long offset, size_t size, enum dma_data_direction dir,
64 unsigned long attrs);
65int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
66 enum dma_data_direction dir, unsigned long attrs);
67int dma_direct_supported(struct device *dev, u64 mask);
68int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr);
69#endif /* _LINUX_DMA_DIRECT_H */