Commit | Line | Data |
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1965aae3 PA |
1 | #ifndef _ASM_X86_DMA_MAPPING_H |
2 | #define _ASM_X86_DMA_MAPPING_H | |
6f536635 GC |
3 | |
4 | /* | |
395cf969 | 5 | * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and |
5872fb94 | 6 | * Documentation/DMA-API.txt for documentation. |
6f536635 GC |
7 | */ |
8 | ||
d7002857 | 9 | #include <linux/kmemcheck.h> |
6f536635 | 10 | #include <linux/scatterlist.h> |
2118d0c5 | 11 | #include <linux/dma-debug.h> |
abe6602b | 12 | #include <linux/dma-attrs.h> |
6f536635 GC |
13 | #include <asm/io.h> |
14 | #include <asm/swiotlb.h> | |
0a2b9a6e | 15 | #include <linux/dma-contiguous.h> |
6f536635 | 16 | |
eb647138 JB |
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 | ||
8fd524b3 FT |
23 | #define DMA_ERROR_CODE 0 |
24 | ||
b7107a3d | 25 | extern int iommu_merge; |
6c505ce3 | 26 | extern struct device x86_dma_fallback_dev; |
b7107a3d | 27 | extern int panic_on_overflow; |
7c183416 | 28 | |
160c1d8e FT |
29 | extern struct dma_map_ops *dma_ops; |
30 | ||
31 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) | |
c786df08 | 32 | { |
4692d77f | 33 | #ifndef CONFIG_X86_DEV_DMA_OPS |
8d8bb39b FT |
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; | |
cfb80c9e | 40 | #endif |
8d8bb39b FT |
41 | } |
42 | ||
6894258e CH |
43 | bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp); |
44 | #define arch_dma_alloc_attrs arch_dma_alloc_attrs | |
45 | ||
ee196371 CH |
46 | #define HAVE_ARCH_DMA_SUPPORTED 1 |
47 | extern int dma_supported(struct device *hwdev, u64 mask); | |
48 | ||
9f6ac577 | 49 | extern void *dma_generic_alloc_coherent(struct device *dev, size_t size, |
baa676fc AP |
50 | dma_addr_t *dma_addr, gfp_t flag, |
51 | struct dma_attrs *attrs); | |
9f6ac577 | 52 | |
0a2b9a6e MS |
53 | extern void dma_generic_free_coherent(struct device *dev, size_t size, |
54 | void *vaddr, dma_addr_t dma_addr, | |
55 | struct dma_attrs *attrs); | |
56 | ||
f7219a53 AR |
57 | #ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */ |
58 | extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size); | |
59 | extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr); | |
60 | extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr); | |
61 | #else | |
62 | ||
99becaca FT |
63 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
64 | { | |
65 | if (!dev->dma_mask) | |
66 | return 0; | |
67 | ||
ac2b3e67 | 68 | return addr + size - 1 <= *dev->dma_mask; |
99becaca FT |
69 | } |
70 | ||
8d4f5339 FT |
71 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
72 | { | |
73 | return paddr; | |
74 | } | |
75 | ||
76 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) | |
77 | { | |
78 | return daddr; | |
79 | } | |
f7219a53 | 80 | #endif /* CONFIG_X86_DMA_REMAP */ |
8d4f5339 | 81 | |
3cb6a917 GC |
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 | } | |
ae17a63b | 88 | |
823e7e8c FT |
89 | static inline unsigned long dma_alloc_coherent_mask(struct device *dev, |
90 | gfp_t gfp) | |
91 | { | |
92 | unsigned long dma_mask = 0; | |
b7107a3d | 93 | |
823e7e8c FT |
94 | dma_mask = dev->coherent_dma_mask; |
95 | if (!dma_mask) | |
2f4f27d4 | 96 | dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32); |
823e7e8c FT |
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 | ||
2f4f27d4 | 105 | if (dma_mask <= DMA_BIT_MASK(24)) |
75bebb7f FT |
106 | gfp |= GFP_DMA; |
107 | #ifdef CONFIG_X86_64 | |
284901a9 | 108 | if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) |
823e7e8c FT |
109 | gfp |= GFP_DMA32; |
110 | #endif | |
111 | return gfp; | |
112 | } | |
113 | ||
6f536635 | 114 | #endif |