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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/memblock.h> /* for min_low_pfn */
7 : : #include <linux/mem_encrypt.h>
8 : :
9 : : extern unsigned int zone_dma_bits;
10 : :
11 : : #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
12 : : #include <asm/dma-direct.h>
13 : : #else
14 : 38793 : static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
15 : : {
16 : 38793 : dma_addr_t dev_addr = (dma_addr_t)paddr;
17 : :
18 [ # # ]: 0 : return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
19 : : }
20 : :
21 : 77520 : static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
22 : : {
23 : 77520 : phys_addr_t paddr = (phys_addr_t)dev_addr;
24 : :
25 : 77520 : return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
26 : : }
27 : : #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
28 : :
29 : : #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
30 : : bool force_dma_unencrypted(struct device *dev);
31 : : #else
32 : 88 : static inline bool force_dma_unencrypted(struct device *dev)
33 : : {
34 [ + - + - ]: 66 : return false;
35 : : }
36 : : #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
37 : :
38 : : /*
39 : : * If memory encryption is supported, phys_to_dma will set the memory encryption
40 : : * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
41 : : * and __dma_to_phys versions should only be used on non-encrypted memory for
42 : : * special occasions like DMA coherent buffers.
43 : : */
44 : 38793 : static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
45 : : {
46 [ - + + - ]: 38793 : return __sme_set(__phys_to_dma(dev, paddr));
47 : : }
48 : :
49 : 77520 : static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
50 : : {
51 [ + - - - : 77520 : return __sme_clr(__dma_to_phys(dev, daddr));
+ - - - -
- + - ]
52 : : }
53 : :
54 : 38749 : static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
55 : : bool is_ram)
56 : : {
57 : 38749 : dma_addr_t end = addr + size - 1;
58 : :
59 [ - - + - ]: 38749 : if (!dev->dma_mask)
60 : : return false;
61 : :
62 : 38749 : if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
63 : : min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
64 : : return false;
65 : :
66 [ - - - - : 38749 : return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
+ - - + ]
67 : : }
68 : :
69 : : u64 dma_direct_get_required_mask(struct device *dev);
70 : : void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
71 : : gfp_t gfp, unsigned long attrs);
72 : : void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
73 : : dma_addr_t dma_addr, unsigned long attrs);
74 : : void *dma_direct_alloc_pages(struct device *dev, size_t size,
75 : : dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
76 : : void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
77 : : dma_addr_t dma_addr, unsigned long attrs);
78 : : struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
79 : : gfp_t gfp, unsigned long attrs);
80 : : int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt,
81 : : void *cpu_addr, dma_addr_t dma_addr, size_t size,
82 : : unsigned long attrs);
83 : : bool dma_direct_can_mmap(struct device *dev);
84 : : int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma,
85 : : void *cpu_addr, dma_addr_t dma_addr, size_t size,
86 : : unsigned long attrs);
87 : : int dma_direct_supported(struct device *dev, u64 mask);
88 : : #endif /* _LINUX_DMA_DIRECT_H */
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