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
33/* default to 64MB */
34#define IO_TLB_DEFAULT_SIZE (64UL<<20)
35
36extern void swiotlb_init(int verbose);
37int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
38extern unsigned long swiotlb_nr_tbl(void);
39unsigned long swiotlb_size_or_default(void);
40extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
41extern int swiotlb_late_init_with_default_size(size_t default_size);
42extern void __init swiotlb_update_mem_attributes(void);
43
44/*
45 * Enumeration for sync targets
46 */
47enum dma_sync_target {
48 SYNC_FOR_CPU = 0,
49 SYNC_FOR_DEVICE = 1,
50};
51
52phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
53 size_t mapping_size, size_t alloc_size,
54 enum dma_data_direction dir, unsigned long attrs);
55
56extern void swiotlb_tbl_unmap_single(struct device *hwdev,
57 phys_addr_t tlb_addr,
58 size_t mapping_size,
59 size_t alloc_size,
60 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
68dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
69 size_t size, enum dma_data_direction dir, unsigned long attrs);
70
71#ifdef CONFIG_SWIOTLB
72extern enum swiotlb_force swiotlb_force;
73extern phys_addr_t io_tlb_start, io_tlb_end;
74
75static inline bool is_swiotlb_buffer(phys_addr_t paddr)
76{
77 return paddr >= io_tlb_start && paddr < io_tlb_end;
78}
79
80void __init swiotlb_exit(void);
81unsigned int swiotlb_max_segment(void);
82size_t swiotlb_max_mapping_size(struct device *dev);
83bool is_swiotlb_active(void);
84void __init swiotlb_adjust_size(unsigned long new_size);
85#else
86#define swiotlb_force SWIOTLB_NO_FORCE
87static inline bool is_swiotlb_buffer(phys_addr_t paddr)
88{
89 return false;
90}
91static inline void swiotlb_exit(void)
92{
93}
94static inline unsigned int swiotlb_max_segment(void)
95{
96 return 0;
97}
98static inline size_t swiotlb_max_mapping_size(struct device *dev)
99{
100 return SIZE_MAX;
101}
102
103static inline bool is_swiotlb_active(void)
104{
105 return false;
106}
107
108static inline void swiotlb_adjust_size(unsigned long new_size)
109{
110}
111#endif /* CONFIG_SWIOTLB */
112
113extern void swiotlb_print_info(void);
114extern void swiotlb_set_max_segment(unsigned int);
115
116#endif /* __LINUX_SWIOTLB_H */