Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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);
28extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
29
30/*
31 * Enumeration for sync targets
32 */
33enum dma_sync_target {
34 SYNC_FOR_CPU = 0,
35 SYNC_FOR_DEVICE = 1,
36};
37
38/* define the last possible byte of physical address space as a mapping error */
39#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
40
41extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
42 dma_addr_t tbl_dma_addr,
43 phys_addr_t phys, size_t size,
44 enum dma_data_direction dir);
45
46extern void swiotlb_tbl_unmap_single(struct device *hwdev,
47 phys_addr_t tlb_addr,
48 size_t size, enum dma_data_direction dir);
49
50extern void swiotlb_tbl_sync_single(struct device *hwdev,
51 phys_addr_t tlb_addr,
52 size_t size, enum dma_data_direction dir,
53 enum dma_sync_target target);
54
55/* Accessory functions. */
56extern void
57*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
58 dma_addr_t *dma_handle, gfp_t flags);
59
60extern void
61swiotlb_free_coherent(struct device *hwdev, size_t size,
62 void *vaddr, dma_addr_t dma_handle);
63
64extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
65 unsigned long offset, size_t size,
66 enum dma_data_direction dir,
67 struct dma_attrs *attrs);
68extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
69 size_t size, enum dma_data_direction dir,
70 struct dma_attrs *attrs);
71
72extern int
73swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
74 enum dma_data_direction dir);
75
76extern void
77swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
78 enum dma_data_direction dir);
79
80extern int
81swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
82 enum dma_data_direction dir, struct dma_attrs *attrs);
83
84extern void
85swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
86 int nelems, enum dma_data_direction dir,
87 struct dma_attrs *attrs);
88
89extern void
90swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
91 size_t size, enum dma_data_direction dir);
92
93extern void
94swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
95 int nelems, enum dma_data_direction dir);
96
97extern void
98swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
99 size_t size, enum dma_data_direction dir);
100
101extern void
102swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
103 int nelems, enum dma_data_direction dir);
104
105extern int
106swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
107
108extern int
109swiotlb_dma_supported(struct device *hwdev, u64 mask);
110
111#ifdef CONFIG_SWIOTLB
112extern void __init swiotlb_free(void);
113#else
114static inline void swiotlb_free(void) { }
115#endif
116
117extern void swiotlb_print_info(void);
118#endif /* __LINUX_SWIOTLB_H */