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 swiotlb_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
swiotlb_free(void)109 static inline void swiotlb_free(void) { }
110 #endif
111
112 extern void swiotlb_print_info(void);
113 #endif /* __LINUX_SWIOTLB_H */
114