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#include <linux/limits.h>
9
10struct device;
11struct page;
12struct scatterlist;
13
14enum swiotlb_force {
15 SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
16 SWIOTLB_FORCE, /* swiotlb=force */
17 SWIOTLB_NO_FORCE, /* swiotlb=noforce */
18};
19
20/*
21 * Maximum allowable number of contiguous slabs to map,
22 * must be a power of 2. What is the appropriate value ?
23 * The complexity of {map,unmap}_single is linearly dependent on this value.
24 */
25#define IO_TLB_SEGSIZE 128
26
27/*
28 * log of the size of each IO TLB slab. The number of slabs is command line
29 * controllable.
30 */
31#define IO_TLB_SHIFT 11
32#define IO_TLB_SIZE (1 << IO_TLB_SHIFT)
33
34/* default to 64MB */
35#define IO_TLB_DEFAULT_SIZE (64UL<<20)
36
37extern void swiotlb_init(int verbose);
38int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
39extern unsigned long swiotlb_nr_tbl(void);
40unsigned long swiotlb_size_or_default(void);
41extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
42extern int swiotlb_late_init_with_default_size(size_t default_size);
43extern void __init swiotlb_update_mem_attributes(void);
44
45/*
46 * Enumeration for sync targets
47 */
48enum dma_sync_target {
49 SYNC_FOR_CPU = 0,
50 SYNC_FOR_DEVICE = 1,
51};
52
53phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
54 size_t mapping_size, size_t alloc_size,
55 enum dma_data_direction dir, unsigned long attrs);
56
57extern void swiotlb_tbl_unmap_single(struct device *hwdev,
58 phys_addr_t tlb_addr,
59 size_t mapping_size,
60 size_t alloc_size,
61 enum dma_data_direction dir,
62 unsigned long attrs);
63
64extern void swiotlb_tbl_sync_single(struct device *hwdev,
65 phys_addr_t tlb_addr,
66 size_t size, enum dma_data_direction dir,
67 enum dma_sync_target target);
68
69dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
70 size_t size, enum dma_data_direction dir, unsigned long attrs);
71
72#ifdef CONFIG_SWIOTLB
73extern enum swiotlb_force swiotlb_force;
74extern phys_addr_t io_tlb_start, io_tlb_end;
75
76static inline bool is_swiotlb_buffer(phys_addr_t paddr)
77{
78 return paddr >= io_tlb_start && paddr < io_tlb_end;
79}
80
81void __init swiotlb_exit(void);
82unsigned int swiotlb_max_segment(void);
83size_t swiotlb_max_mapping_size(struct device *dev);
84bool is_swiotlb_active(void);
85void __init swiotlb_adjust_size(unsigned long new_size);
86#else
87#define swiotlb_force SWIOTLB_NO_FORCE
88static inline bool is_swiotlb_buffer(phys_addr_t paddr)
89{
90 return false;
91}
92static inline void swiotlb_exit(void)
93{
94}
95static inline unsigned int swiotlb_max_segment(void)
96{
97 return 0;
98}
99static inline size_t swiotlb_max_mapping_size(struct device *dev)
100{
101 return SIZE_MAX;
102}
103
104static inline bool is_swiotlb_active(void)
105{
106 return false;
107}
108
109static inline void swiotlb_adjust_size(unsigned long new_size)
110{
111}
112#endif /* CONFIG_SWIOTLB */
113
114extern void swiotlb_print_info(void);
115extern void swiotlb_set_max_segment(unsigned int);
116
117#endif /* __LINUX_SWIOTLB_H */