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1 | #ifndef __LINUX_SWIOTLB_H | |
2 | #define __LINUX_SWIOTLB_H | |
3 | ||
4 | #include <linux/dma-direction.h> | |
5 | #include <linux/init.h> | |
6 | #include <linux/types.h> | |
7 | ||
8 | struct device; | |
9 | struct page; | |
10 | struct scatterlist; | |
11 | ||
12 | enum swiotlb_force { | |
13 | SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */ | |
14 | SWIOTLB_FORCE, /* swiotlb=force */ | |
15 | SWIOTLB_NO_FORCE, /* swiotlb=noforce */ | |
16 | }; | |
17 | ||
18 | extern enum swiotlb_force swiotlb_force; | |
19 | ||
20 | /* | |
21 | * Maximum allowable number of contiguous slabs to map, | |
22 | * must be a power of 2. What is the appropriate value ? | |
23 | * The complexity of {map,unmap}_single is linearly dependent on this value. | |
24 | */ | |
25 | #define IO_TLB_SEGSIZE 128 | |
26 | ||
27 | /* | |
28 | * log of the size of each IO TLB slab. The number of slabs is command line | |
29 | * controllable. | |
30 | */ | |
31 | #define IO_TLB_SHIFT 11 | |
32 | ||
33 | extern void swiotlb_init(int verbose); | |
34 | int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); | |
35 | extern unsigned long swiotlb_nr_tbl(void); | |
36 | unsigned long swiotlb_size_or_default(void); | |
37 | extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); | |
38 | ||
39 | /* | |
40 | * Enumeration for sync targets | |
41 | */ | |
42 | enum dma_sync_target { | |
43 | SYNC_FOR_CPU = 0, | |
44 | SYNC_FOR_DEVICE = 1, | |
45 | }; | |
46 | ||
47 | /* define the last possible byte of physical address space as a mapping error */ | |
48 | #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0) | |
49 | ||
50 | extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, | |
51 | dma_addr_t tbl_dma_addr, | |
52 | phys_addr_t phys, size_t size, | |
53 | enum dma_data_direction dir, | |
54 | unsigned long attrs); | |
55 | ||
56 | extern void swiotlb_tbl_unmap_single(struct device *hwdev, | |
57 | phys_addr_t tlb_addr, | |
58 | size_t size, enum dma_data_direction dir, | |
59 | unsigned long attrs); | |
60 | ||
61 | extern void swiotlb_tbl_sync_single(struct device *hwdev, | |
62 | phys_addr_t tlb_addr, | |
63 | size_t size, enum dma_data_direction dir, | |
64 | enum dma_sync_target target); | |
65 | ||
66 | /* Accessory functions. */ | |
67 | extern void | |
68 | *swiotlb_alloc_coherent(struct device *hwdev, size_t size, | |
69 | dma_addr_t *dma_handle, gfp_t flags); | |
70 | ||
71 | extern void | |
72 | swiotlb_free_coherent(struct device *hwdev, size_t size, | |
73 | void *vaddr, dma_addr_t dma_handle); | |
74 | ||
75 | extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, | |
76 | unsigned long offset, size_t size, | |
77 | enum dma_data_direction dir, | |
78 | unsigned long attrs); | |
79 | extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, | |
80 | size_t size, enum dma_data_direction dir, | |
81 | unsigned long attrs); | |
82 | ||
83 | extern int | |
84 | swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, | |
85 | enum dma_data_direction dir, | |
86 | unsigned long attrs); | |
87 | ||
88 | extern void | |
89 | swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, | |
90 | int nelems, enum dma_data_direction dir, | |
91 | unsigned long attrs); | |
92 | ||
93 | extern void | |
94 | swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, | |
95 | size_t size, enum dma_data_direction dir); | |
96 | ||
97 | extern void | |
98 | swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, | |
99 | int nelems, enum dma_data_direction dir); | |
100 | ||
101 | extern void | |
102 | swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, | |
103 | size_t size, enum dma_data_direction dir); | |
104 | ||
105 | extern void | |
106 | swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, | |
107 | int nelems, enum dma_data_direction dir); | |
108 | ||
109 | extern int | |
110 | swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); | |
111 | ||
112 | extern int | |
113 | swiotlb_dma_supported(struct device *hwdev, u64 mask); | |
114 | ||
115 | #ifdef CONFIG_SWIOTLB | |
116 | extern void __init swiotlb_free(void); | |
117 | unsigned int swiotlb_max_segment(void); | |
118 | #else | |
119 | static inline void swiotlb_free(void) { } | |
120 | static inline unsigned int swiotlb_max_segment(void) { return 0; } | |
121 | #endif | |
122 | ||
123 | extern void swiotlb_print_info(void); | |
124 | extern int is_swiotlb_buffer(phys_addr_t paddr); | |
125 | extern void swiotlb_set_max_segment(unsigned int); | |
126 | ||
127 | #endif /* __LINUX_SWIOTLB_H */ |