1#ifndef __LINUX_SWIOTLB_H
2#define __LINUX_SWIOTLB_H
3
4#include <linux/types.h>
5
6struct device;
7struct dma_attrs;
8struct scatterlist;
9
10extern 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
25extern void swiotlb_init(int verbose);
26extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
27extern unsigned long swiotlb_nr_tbl(void);
28
29/*
30 * Enumeration for sync targets
31 */
32enum dma_sync_target {
33	SYNC_FOR_CPU = 0,
34	SYNC_FOR_DEVICE = 1,
35};
36extern 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
40extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
41				     size_t size, enum dma_data_direction dir);
42
43extern 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. */
48extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
49			   enum dma_data_direction dir);
50
51extern void
52*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
53			dma_addr_t *dma_handle, gfp_t flags);
54
55extern void
56swiotlb_free_coherent(struct device *hwdev, size_t size,
57		      void *vaddr, dma_addr_t dma_handle);
58
59extern 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);
63extern 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
67extern int
68swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
69	       enum dma_data_direction dir);
70
71extern void
72swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
73		 enum dma_data_direction dir);
74
75extern int
76swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
77		     enum dma_data_direction dir, struct dma_attrs *attrs);
78
79extern void
80swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
81		       int nelems, enum dma_data_direction dir,
82		       struct dma_attrs *attrs);
83
84extern void
85swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
86			    size_t size, enum dma_data_direction dir);
87
88extern void
89swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
90			int nelems, enum dma_data_direction dir);
91
92extern void
93swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
94			       size_t size, enum dma_data_direction dir);
95
96extern void
97swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
98			   int nelems, enum dma_data_direction dir);
99
100extern int
101swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
102
103extern int
104swiotlb_dma_supported(struct device *hwdev, u64 mask);
105
106#ifdef CONFIG_SWIOTLB
107extern void __init swiotlb_free(void);
108#else
109static inline void swiotlb_free(void) { }
110#endif
111
112extern void swiotlb_print_info(void);
113#endif /* __LINUX_SWIOTLB_H */
114