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