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1 | #ifndef __LINUX_SWIOTLB_H |
2 | #define __LINUX_SWIOTLB_H |
3 | |
4 | #include <linux/types.h> |
5 | |
6 | struct device; |
7 | struct dma_attrs; |
8 | struct scatterlist; |
9 | |
10 | extern int swiotlb_force; |
11 | |
12 | /* |
13 | * Maximum allowable number of contiguous slabs to map, |
14 | * must be a power of 2. What is the appropriate value ? |
15 | * The complexity of {map,unmap}_single is linearly dependent on this value. |
16 | */ |
17 | #define IO_TLB_SEGSIZE 128 |
18 | |
19 | /* |
20 | * log of the size of each IO TLB slab. The number of slabs is command line |
21 | * controllable. |
22 | */ |
23 | #define IO_TLB_SHIFT 11 |
24 | |
25 | extern void swiotlb_init(int verbose); |
26 | extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); |
27 | extern unsigned long swioltb_nr_tbl(void); |
28 | |
29 | /* |
30 | * Enumeration for sync targets |
31 | */ |
32 | enum dma_sync_target { |
33 | SYNC_FOR_CPU = 0, |
34 | SYNC_FOR_DEVICE = 1, |
35 | }; |
36 | extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr, |
37 | phys_addr_t phys, size_t size, |
38 | enum dma_data_direction dir); |
39 | |
40 | extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, |
41 | size_t size, enum dma_data_direction dir); |
42 | |
43 | extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, |
44 | size_t size, enum dma_data_direction dir, |
45 | enum dma_sync_target target); |
46 | |
47 | /* Accessory functions. */ |
48 | extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, |
49 | enum dma_data_direction dir); |
50 | |
51 | extern void |
52 | *swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
53 | dma_addr_t *dma_handle, gfp_t flags); |
54 | |
55 | extern void |
56 | swiotlb_free_coherent(struct device *hwdev, size_t size, |
57 | void *vaddr, dma_addr_t dma_handle); |
58 | |
59 | extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, |
60 | unsigned long offset, size_t size, |
61 | enum dma_data_direction dir, |
62 | struct dma_attrs *attrs); |
63 | extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, |
64 | size_t size, enum dma_data_direction dir, |
65 | struct dma_attrs *attrs); |
66 | |
67 | extern int |
68 | swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, |
69 | enum dma_data_direction dir); |
70 | |
71 | extern void |
72 | swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, |
73 | enum dma_data_direction dir); |
74 | |
75 | extern int |
76 | swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, |
77 | enum dma_data_direction dir, struct dma_attrs *attrs); |
78 | |
79 | extern void |
80 | swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, |
81 | int nelems, enum dma_data_direction dir, |
82 | struct dma_attrs *attrs); |
83 | |
84 | extern void |
85 | swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, |
86 | size_t size, enum dma_data_direction dir); |
87 | |
88 | extern void |
89 | swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, |
90 | int nelems, enum dma_data_direction dir); |
91 | |
92 | extern void |
93 | swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, |
94 | size_t size, enum dma_data_direction dir); |
95 | |
96 | extern void |
97 | swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, |
98 | int nelems, enum dma_data_direction dir); |
99 | |
100 | extern int |
101 | swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); |
102 | |
103 | extern int |
104 | swiotlb_dma_supported(struct device *hwdev, u64 mask); |
105 | |
106 | #ifdef CONFIG_SWIOTLB |
107 | extern void __init swiotlb_free(void); |
108 | #else |
109 | static inline void swiotlb_free(void) { } |
110 | #endif |
111 | |
112 | extern void swiotlb_print_info(void); |
113 | #endif /* __LINUX_SWIOTLB_H */ |
114 |
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