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1 | #ifndef _ASM_X86_DMA_MAPPING_H | |
2 | #define _ASM_X86_DMA_MAPPING_H | |
3 | ||
4 | /* | |
5 | * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and | |
6 | * Documentation/DMA-API.txt for documentation. | |
7 | */ | |
8 | ||
9 | #include <linux/kmemcheck.h> | |
10 | #include <linux/scatterlist.h> | |
11 | #include <linux/dma-debug.h> | |
12 | #include <linux/dma-attrs.h> | |
13 | #include <asm/io.h> | |
14 | #include <asm/swiotlb.h> | |
15 | #include <asm-generic/dma-coherent.h> | |
16 | ||
17 | #ifdef CONFIG_ISA | |
18 | # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24) | |
19 | #else | |
20 | # define ISA_DMA_BIT_MASK DMA_BIT_MASK(32) | |
21 | #endif | |
22 | ||
23 | #define DMA_ERROR_CODE 0 | |
24 | ||
25 | extern int iommu_merge; | |
26 | extern struct device x86_dma_fallback_dev; | |
27 | extern int panic_on_overflow; | |
28 | ||
29 | extern struct dma_map_ops *dma_ops; | |
30 | ||
31 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) | |
32 | { | |
33 | #ifdef CONFIG_X86_32 | |
34 | return dma_ops; | |
35 | #else | |
36 | if (unlikely(!dev) || !dev->archdata.dma_ops) | |
37 | return dma_ops; | |
38 | else | |
39 | return dev->archdata.dma_ops; | |
40 | #endif | |
41 | } | |
42 | ||
43 | #include <asm-generic/dma-mapping-common.h> | |
44 | ||
45 | /* Make sure we keep the same behaviour */ | |
46 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) | |
47 | { | |
48 | struct dma_map_ops *ops = get_dma_ops(dev); | |
49 | if (ops->mapping_error) | |
50 | return ops->mapping_error(dev, dma_addr); | |
51 | ||
52 | return (dma_addr == DMA_ERROR_CODE); | |
53 | } | |
54 | ||
55 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) | |
56 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) | |
57 | ||
58 | extern int dma_supported(struct device *hwdev, u64 mask); | |
59 | extern int dma_set_mask(struct device *dev, u64 mask); | |
60 | ||
61 | extern void *dma_generic_alloc_coherent(struct device *dev, size_t size, | |
62 | dma_addr_t *dma_addr, gfp_t flag); | |
63 | ||
64 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) | |
65 | { | |
66 | if (!dev->dma_mask) | |
67 | return 0; | |
68 | ||
69 | return addr + size - 1 <= *dev->dma_mask; | |
70 | } | |
71 | ||
72 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) | |
73 | { | |
74 | return paddr; | |
75 | } | |
76 | ||
77 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) | |
78 | { | |
79 | return daddr; | |
80 | } | |
81 | ||
82 | static inline void | |
83 | dma_cache_sync(struct device *dev, void *vaddr, size_t size, | |
84 | enum dma_data_direction dir) | |
85 | { | |
86 | flush_write_buffers(); | |
87 | } | |
88 | ||
89 | static inline unsigned long dma_alloc_coherent_mask(struct device *dev, | |
90 | gfp_t gfp) | |
91 | { | |
92 | unsigned long dma_mask = 0; | |
93 | ||
94 | dma_mask = dev->coherent_dma_mask; | |
95 | if (!dma_mask) | |
96 | dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32); | |
97 | ||
98 | return dma_mask; | |
99 | } | |
100 | ||
101 | static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp) | |
102 | { | |
103 | unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp); | |
104 | ||
105 | if (dma_mask <= DMA_BIT_MASK(24)) | |
106 | gfp |= GFP_DMA; | |
107 | #ifdef CONFIG_X86_64 | |
108 | if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) | |
109 | gfp |= GFP_DMA32; | |
110 | #endif | |
111 | return gfp; | |
112 | } | |
113 | ||
114 | static inline void * | |
115 | dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, | |
116 | gfp_t gfp) | |
117 | { | |
118 | struct dma_map_ops *ops = get_dma_ops(dev); | |
119 | void *memory; | |
120 | ||
121 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); | |
122 | ||
123 | if (dma_alloc_from_coherent(dev, size, dma_handle, &memory)) | |
124 | return memory; | |
125 | ||
126 | if (!dev) | |
127 | dev = &x86_dma_fallback_dev; | |
128 | ||
129 | if (!is_device_dma_capable(dev)) | |
130 | return NULL; | |
131 | ||
132 | if (!ops->alloc_coherent) | |
133 | return NULL; | |
134 | ||
135 | memory = ops->alloc_coherent(dev, size, dma_handle, | |
136 | dma_alloc_coherent_gfp_flags(dev, gfp)); | |
137 | debug_dma_alloc_coherent(dev, size, *dma_handle, memory); | |
138 | ||
139 | return memory; | |
140 | } | |
141 | ||
142 | static inline void dma_free_coherent(struct device *dev, size_t size, | |
143 | void *vaddr, dma_addr_t bus) | |
144 | { | |
145 | struct dma_map_ops *ops = get_dma_ops(dev); | |
146 | ||
147 | WARN_ON(irqs_disabled()); /* for portability */ | |
148 | ||
149 | if (dma_release_from_coherent(dev, get_order(size), vaddr)) | |
150 | return; | |
151 | ||
152 | debug_dma_free_coherent(dev, size, vaddr, bus); | |
153 | if (ops->free_coherent) | |
154 | ops->free_coherent(dev, size, vaddr, bus); | |
155 | } | |
156 | ||
157 | #endif |