summaryrefslogtreecommitdiffstats
path: root/include/linux/swiotlb.h
blob: febedcf67c7ec38464add407881e0351f6352ca5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
#ifndef __LINUX_SWIOTLB_H
#define __LINUX_SWIOTLB_H

#include <linux/types.h>

struct device;
struct dma_attrs;
struct scatterlist;

extern int swiotlb_force;

/*
 * Maximum allowable number of contiguous slabs to map,
 * must be a power of 2.  What is the appropriate value ?
 * The complexity of {map,unmap}_single is linearly dependent on this value.
 */
#define IO_TLB_SEGSIZE	128

/*
 * log of the size of each IO TLB slab.  The number of slabs is command line
 * controllable.
 */
#define IO_TLB_SHIFT 11

extern void swiotlb_init(int verbose);

extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
			dma_addr_t *dma_handle, gfp_t flags);

extern void
swiotlb_free_coherent(struct device *hwdev, size_t size,
		      void *vaddr, dma_addr_t dma_handle);

extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
				   unsigned long offset, size_t size,
				   enum dma_data_direction dir,
				   struct dma_attrs *attrs);
extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
			       size_t size, enum dma_data_direction dir,
			       struct dma_attrs *attrs);

extern int
swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
	       int direction);

extern void
swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
		 int direction);

extern int
swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
		     enum dma_data_direction dir, struct dma_attrs *attrs);

extern void
swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
		       int nelems, enum dma_data_direction dir,
		       struct dma_attrs *attrs);

extern void
swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
			    size_t size, enum dma_data_direction dir);

extern void
swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
			int nelems, enum dma_data_direction dir);

extern void
swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
			       size_t size, enum dma_data_direction dir);

extern void
swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
			   int nelems, enum dma_data_direction dir);

extern void
swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
				  unsigned long offset, size_t size,
				  enum dma_data_direction dir);

extern void
swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
				     unsigned long offset, size_t size,
				     enum dma_data_direction dir);

extern int
swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);

extern int
swiotlb_dma_supported(struct device *hwdev, u64 mask);

#ifdef CONFIG_SWIOTLB
extern void __init swiotlb_free(void);
#else
static inline void swiotlb_free(void) { }
#endif

extern void swiotlb_print_info(void);
#endif /* __LINUX_SWIOTLB_H */