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
28 /*
29 * Enumeration for sync targets
30 */
31 enum dma_sync_target {
32 SYNC_FOR_CPU = 0,
33 SYNC_FOR_DEVICE = 1,
34 };
35 extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
36 phys_addr_t phys, size_t size,
37 enum dma_data_direction dir);
38
39 extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
40 size_t size, enum dma_data_direction dir);
41
42 extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
43 size_t size, enum dma_data_direction dir,
44 enum dma_sync_target target);
45
46 /* Accessory functions. */
47 extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
48 enum dma_data_direction dir);
49
50 extern void
51 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
52 dma_addr_t *dma_handle, gfp_t flags);
53
54 extern void
55 swiotlb_free_coherent(struct device *hwdev, size_t size,
56 void *vaddr, dma_addr_t dma_handle);
57
58 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
59 unsigned long offset, size_t size,
60 enum dma_data_direction dir,
61 struct dma_attrs *attrs);
62 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
63 size_t size, enum dma_data_direction dir,
64 struct dma_attrs *attrs);
65
66 extern int
67 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
68 enum dma_data_direction dir);
69
70 extern void
71 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
72 enum dma_data_direction dir);
73
74 extern int
75 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
76 enum dma_data_direction dir, struct dma_attrs *attrs);
77
78 extern void
79 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
80 int nelems, enum dma_data_direction dir,
81 struct dma_attrs *attrs);
82
83 extern void
84 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
85 size_t size, enum dma_data_direction dir);
86
87 extern void
88 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
89 int nelems, enum dma_data_direction dir);
90
91 extern void
92 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
93 size_t size, enum dma_data_direction dir);
94
95 extern void
96 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
97 int nelems, enum dma_data_direction dir);
98
99 extern int
100 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
101
102 extern int
103 swiotlb_dma_supported(struct device *hwdev, u64 mask);
104
105 #ifdef CONFIG_SWIOTLB
106 extern void __init swiotlb_free(void);
107 #else
swiotlb_free(void)108 static inline void swiotlb_free(void) { }
109 #endif
110
111 extern void swiotlb_print_info(void);
112 #endif /* __LINUX_SWIOTLB_H */
113