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#define DIRECT_MAPPING_ERROR (~(dma_addr_t)0)
9
10#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
11#include <asm/dma-direct.h>
12#else
13static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
14{
15 dma_addr_t dev_addr = (dma_addr_t)paddr;
16
17 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
18}
19
20static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
21{
22 phys_addr_t paddr = (phys_addr_t)dev_addr;
23
24 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
25}
26
27static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
28{
29 if (!dev->dma_mask)
30 return false;
31
32 return addr + size - 1 <=
33 min_not_zero(*dev->dma_mask, dev->bus_dma_mask);
34}
35#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
36
37/*
38 * If memory encryption is supported, phys_to_dma will set the memory encryption
39 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
40 * and __dma_to_phys versions should only be used on non-encrypted memory for
41 * special occasions like DMA coherent buffers.
42 */
43static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
44{
45 return __sme_set(__phys_to_dma(dev, paddr));
46}
47
48static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
49{
50 return __sme_clr(__dma_to_phys(dev, daddr));
51}
52
53#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
54void dma_mark_clean(void *addr, size_t size);
55#else
56static inline void dma_mark_clean(void *addr, size_t size)
57{
58}
59#endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
60
61u64 dma_direct_get_required_mask(struct device *dev);
62void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
63 gfp_t gfp, unsigned long attrs);
64void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
65 dma_addr_t dma_addr, unsigned long attrs);
66void *dma_direct_alloc_pages(struct device *dev, size_t size,
67 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
68void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
69 dma_addr_t dma_addr, unsigned long attrs);
70dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
71 unsigned long offset, size_t size, enum dma_data_direction dir,
72 unsigned long attrs);
73int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
74 enum dma_data_direction dir, unsigned long attrs);
75int dma_direct_supported(struct device *dev, u64 mask);
76int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr);
77#endif /* _LINUX_DMA_DIRECT_H */