Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_SWIOTLB_H
3#define __LINUX_SWIOTLB_H
4
5#include <linux/dma-direction.h>
6#include <linux/init.h>
7#include <linux/types.h>
8
9struct device;
10struct page;
11struct scatterlist;
12
13enum swiotlb_force {
14 SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
15 SWIOTLB_FORCE, /* swiotlb=force */
16 SWIOTLB_NO_FORCE, /* swiotlb=noforce */
17};
18
19extern enum swiotlb_force swiotlb_force;
20
21/*
22 * Maximum allowable number of contiguous slabs to map,
23 * must be a power of 2. What is the appropriate value ?
24 * The complexity of {map,unmap}_single is linearly dependent on this value.
25 */
26#define IO_TLB_SEGSIZE 128
27
28/*
29 * log of the size of each IO TLB slab. The number of slabs is command line
30 * controllable.
31 */
32#define IO_TLB_SHIFT 11
33
34extern void swiotlb_init(int verbose);
35int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
36extern unsigned long swiotlb_nr_tbl(void);
37unsigned long swiotlb_size_or_default(void);
38extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
39extern void __init swiotlb_update_mem_attributes(void);
40
41/*
42 * Enumeration for sync targets
43 */
44enum dma_sync_target {
45 SYNC_FOR_CPU = 0,
46 SYNC_FOR_DEVICE = 1,
47};
48
49/* define the last possible byte of physical address space as a mapping error */
50#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
51
52extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
53 dma_addr_t tbl_dma_addr,
54 phys_addr_t phys, size_t size,
55 enum dma_data_direction dir,
56 unsigned long attrs);
57
58extern void swiotlb_tbl_unmap_single(struct device *hwdev,
59 phys_addr_t tlb_addr,
60 size_t size, enum dma_data_direction dir,
61 unsigned long attrs);
62
63extern void swiotlb_tbl_sync_single(struct device *hwdev,
64 phys_addr_t tlb_addr,
65 size_t size, enum dma_data_direction dir,
66 enum dma_sync_target target);
67
68/* Accessory functions. */
69
70extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
71 unsigned long offset, size_t size,
72 enum dma_data_direction dir,
73 unsigned long attrs);
74extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
75 size_t size, enum dma_data_direction dir,
76 unsigned long attrs);
77
78extern int
79swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
80 enum dma_data_direction dir,
81 unsigned long attrs);
82
83extern void
84swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
85 int nelems, enum dma_data_direction dir,
86 unsigned long attrs);
87
88extern void
89swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
90 size_t size, enum dma_data_direction dir);
91
92extern void
93swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
94 int nelems, enum dma_data_direction dir);
95
96extern void
97swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
98 size_t size, enum dma_data_direction dir);
99
100extern void
101swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
102 int nelems, enum dma_data_direction dir);
103
104extern int
105swiotlb_dma_supported(struct device *hwdev, u64 mask);
106
107#ifdef CONFIG_SWIOTLB
108extern void __init swiotlb_exit(void);
109unsigned int swiotlb_max_segment(void);
110#else
111static inline void swiotlb_exit(void) { }
112static inline unsigned int swiotlb_max_segment(void) { return 0; }
113#endif
114
115extern void swiotlb_print_info(void);
116extern void swiotlb_set_max_segment(unsigned int);
117
118extern const struct dma_map_ops swiotlb_dma_ops;
119
120#endif /* __LINUX_SWIOTLB_H */