1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* <<
3 * Internals of the DMA direct mapping impleme <<
4 * DMA mapping code and IOMMU drivers. <<
5 */ <<
6 #ifndef _LINUX_DMA_DIRECT_H 2 #ifndef _LINUX_DMA_DIRECT_H
7 #define _LINUX_DMA_DIRECT_H 1 3 #define _LINUX_DMA_DIRECT_H 1
8 4
9 #include <linux/dma-mapping.h> 5 #include <linux/dma-mapping.h>
10 #include <linux/dma-map-ops.h> <<
11 #include <linux/memblock.h> /* for min_low_pfn 6 #include <linux/memblock.h> /* for min_low_pfn */
12 #include <linux/mem_encrypt.h> 7 #include <linux/mem_encrypt.h>
13 #include <linux/swiotlb.h> <<
14 8
15 extern unsigned int zone_dma_bits; 9 extern unsigned int zone_dma_bits;
16 10
17 /* !! 11 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
18 * Record the mapping of CPU physical to DMA a !! 12 #include <asm/dma-direct.h>
19 */ !! 13 #else
20 struct bus_dma_region { !! 14 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
21 phys_addr_t cpu_start; <<
22 dma_addr_t dma_start; <<
23 u64 size; <<
24 }; <<
25 <<
26 static inline dma_addr_t translate_phys_to_dma <<
27 phys_addr_t paddr) <<
28 { <<
29 const struct bus_dma_region *m; <<
30 <<
31 for (m = dev->dma_range_map; m->size; <<
32 u64 offset = paddr - m->cpu_st <<
33 <<
34 if (paddr >= m->cpu_start && o <<
35 return m->dma_start + <<
36 } <<
37 <<
38 /* make sure dma_capable fails when no <<
39 return DMA_MAPPING_ERROR; <<
40 } <<
41 <<
42 static inline phys_addr_t translate_dma_to_phy <<
43 dma_addr_t dma_addr) <<
44 { <<
45 const struct bus_dma_region *m; <<
46 <<
47 for (m = dev->dma_range_map; m->size; <<
48 u64 offset = dma_addr - m->dma <<
49 <<
50 if (dma_addr >= m->dma_start & <<
51 return m->cpu_start + <<
52 } <<
53 <<
54 return (phys_addr_t)-1; <<
55 } <<
56 <<
57 static inline dma_addr_t dma_range_map_min(con <<
58 { 15 {
59 dma_addr_t ret = (dma_addr_t)U64_MAX; !! 16 dma_addr_t dev_addr = (dma_addr_t)paddr;
60 17
61 for (; map->size; map++) !! 18 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
62 ret = min(ret, map->dma_start) <<
63 return ret; <<
64 } 19 }
65 20
66 static inline dma_addr_t dma_range_map_max(con !! 21 static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
67 { 22 {
68 dma_addr_t ret = 0; !! 23 phys_addr_t paddr = (phys_addr_t)dev_addr;
69 24
70 for (; map->size; map++) !! 25 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
71 ret = max(ret, map->dma_start <<
72 return ret; <<
73 } 26 }
>> 27 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
74 28
75 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA !! 29 #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
76 #include <asm/dma-direct.h> !! 30 bool force_dma_unencrypted(struct device *dev);
77 #ifndef phys_to_dma_unencrypted <<
78 #define phys_to_dma_unencrypted phys_t <<
79 #endif <<
80 #else 31 #else
81 static inline dma_addr_t phys_to_dma_unencrypt !! 32 static inline bool force_dma_unencrypted(struct device *dev)
82 phys_addr_t paddr) <<
83 { 33 {
84 if (dev->dma_range_map) !! 34 return false;
85 return translate_phys_to_dma(d <<
86 return paddr; <<
87 } 35 }
>> 36 #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
88 37
89 /* 38 /*
90 * If memory encryption is supported, phys_to_ 39 * If memory encryption is supported, phys_to_dma will set the memory encryption
91 * bit in the DMA address, and dma_to_phys wil !! 40 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
92 * phys_to_dma_unencrypted is for use on speci !! 41 * and __dma_to_phys versions should only be used on non-encrypted memory for
93 * buffers. !! 42 * special occasions like DMA coherent buffers.
94 */ 43 */
95 static inline dma_addr_t phys_to_dma(struct de 44 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
96 { 45 {
97 return __sme_set(phys_to_dma_unencrypt !! 46 return __sme_set(__phys_to_dma(dev, paddr));
98 } <<
99 <<
100 static inline phys_addr_t dma_to_phys(struct d <<
101 { <<
102 phys_addr_t paddr; <<
103 <<
104 if (dev->dma_range_map) <<
105 paddr = translate_dma_to_phys( <<
106 else <<
107 paddr = dma_addr; <<
108 <<
109 return __sme_clr(paddr); <<
110 } 47 }
111 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */ <<
112 48
113 #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED !! 49 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
114 bool force_dma_unencrypted(struct device *dev) <<
115 #else <<
116 static inline bool force_dma_unencrypted(struc <<
117 { 50 {
118 return false; !! 51 return __sme_clr(__dma_to_phys(dev, daddr));
119 } 52 }
120 #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTE <<
121 53
122 static inline bool dma_capable(struct device * 54 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
123 bool is_ram) 55 bool is_ram)
124 { 56 {
125 dma_addr_t end = addr + size - 1; 57 dma_addr_t end = addr + size - 1;
126 58
127 if (addr == DMA_MAPPING_ERROR) !! 59 if (!dev->dma_mask)
128 return false; 60 return false;
>> 61
129 if (is_ram && !IS_ENABLED(CONFIG_ARCH_ 62 if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
130 min(addr, end) < phys_to_dma(dev, 63 min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
131 return false; 64 return false;
132 65
133 return end <= min_not_zero(*dev->dma_m 66 return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
134 } 67 }
135 68
136 u64 dma_direct_get_required_mask(struct device 69 u64 dma_direct_get_required_mask(struct device *dev);
137 void *dma_direct_alloc(struct device *dev, siz 70 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
138 gfp_t gfp, unsigned long attrs 71 gfp_t gfp, unsigned long attrs);
139 void dma_direct_free(struct device *dev, size_ 72 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
140 dma_addr_t dma_addr, unsigned 73 dma_addr_t dma_addr, unsigned long attrs);
141 struct page *dma_direct_alloc_pages(struct dev !! 74 void *dma_direct_alloc_pages(struct device *dev, size_t size,
142 dma_addr_t *dma_handle, enum d !! 75 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
143 void dma_direct_free_pages(struct device *dev, !! 76 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
144 struct page *page, dma_addr_t !! 77 dma_addr_t dma_addr, unsigned long attrs);
145 enum dma_data_direction dir); !! 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);
146 int dma_direct_supported(struct device *dev, u 87 int dma_direct_supported(struct device *dev, u64 mask);
147 dma_addr_t dma_direct_map_resource(struct devi <<
148 size_t size, enum dma_data_dir <<
149 <<
150 #endif /* _LINUX_DMA_DIRECT_H */ 88 #endif /* _LINUX_DMA_DIRECT_H */
151 89
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