summaryrefslogtreecommitdiffstats
path: root/include/linux/swiotlb.h
blob: 5b1f2a00491c15c9be4800ceda4662bc72ac0e54 (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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_SWIOTLB_H
#define __LINUX_SWIOTLB_H

#include <linux/dma-direction.h>
#include <linux/init.h>
#include <linux/types.h>

struct device;
struct page;
struct scatterlist;

enum swiotlb_force {
	SWIOTLB_NORMAL,		/* Default - depending on HW DMA mask etc. */
	SWIOTLB_FORCE,		/* swiotlb=force */
	SWIOTLB_NO_FORCE,	/* swiotlb=noforce */
};

extern enum swiotlb_force 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);
int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
extern unsigned long swiotlb_nr_tbl(void);
unsigned long swiotlb_size_or_default(void);
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
extern void __init swiotlb_update_mem_attributes(void);

/*
 * Enumeration for sync targets
 */
enum dma_sync_target {
	SYNC_FOR_CPU = 0,
	SYNC_FOR_DEVICE = 1,
};

/* define the last possible byte of physical address space as a mapping error */
#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)

extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
					  dma_addr_t tbl_dma_addr,
					  phys_addr_t phys, size_t size,
					  enum dma_data_direction dir,
					  unsigned long attrs);

extern void swiotlb_tbl_unmap_single(struct device *hwdev,
				     phys_addr_t tlb_addr,
				     size_t size, enum dma_data_direction dir,
				     unsigned long attrs);

extern void swiotlb_tbl_sync_single(struct device *hwdev,
				    phys_addr_t tlb_addr,
				    size_t size, enum dma_data_direction dir,
				    enum dma_sync_target target);

/* Accessory functions. */

void *swiotlb_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle,
		gfp_t flags, unsigned long attrs);
void swiotlb_free(struct device *dev, size_t size, void *vaddr,
		dma_addr_t dma_addr, unsigned long attrs);

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

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

extern void
swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
		       int nelems, enum dma_data_direction dir,
		       unsigned long 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 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_exit(void);
unsigned int swiotlb_max_segment(void);
#else
static inline void swiotlb_exit(void) { }
static inline unsigned int swiotlb_max_segment(void) { return 0; }
#endif

extern void swiotlb_print_info(void);
extern int is_swiotlb_buffer(phys_addr_t paddr);
extern void swiotlb_set_max_segment(unsigned int);

extern const struct dma_map_ops swiotlb_dma_ops;

#endif /* __LINUX_SWIOTLB_H */