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
33extern void swiotlb_init(int verbose);
34int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
35extern unsigned long swiotlb_nr_tbl(void);
36unsigned long swiotlb_size_or_default(void);
37extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
38extern int swiotlb_late_init_with_default_size(size_t default_size);
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
49phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
50 size_t mapping_size, size_t alloc_size,
51 enum dma_data_direction dir, unsigned long attrs);
52
53extern void swiotlb_tbl_unmap_single(struct device *hwdev,
54 phys_addr_t tlb_addr,
55 size_t mapping_size,
56 size_t alloc_size,
57 enum dma_data_direction dir,
58 unsigned long attrs);
59
60extern void swiotlb_tbl_sync_single(struct device *hwdev,
61 phys_addr_t tlb_addr,
62 size_t size, enum dma_data_direction dir,
63 enum dma_sync_target target);
64
65dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
66 size_t size, enum dma_data_direction dir, unsigned long attrs);
67
68#ifdef CONFIG_SWIOTLB
69extern enum swiotlb_force swiotlb_force;
70extern phys_addr_t io_tlb_start, io_tlb_end;
71
72static inline bool is_swiotlb_buffer(phys_addr_t paddr)
73{
74 return paddr >= io_tlb_start && paddr < io_tlb_end;
75}
76
77void __init swiotlb_exit(void);
78unsigned int swiotlb_max_segment(void);
79size_t swiotlb_max_mapping_size(struct device *dev);
80bool is_swiotlb_active(void);
81#else
82#define swiotlb_force SWIOTLB_NO_FORCE
83static inline bool is_swiotlb_buffer(phys_addr_t paddr)
84{
85 return false;
86}
87static inline void swiotlb_exit(void)
88{
89}
90static inline unsigned int swiotlb_max_segment(void)
91{
92 return 0;
93}
94static inline size_t swiotlb_max_mapping_size(struct device *dev)
95{
96 return SIZE_MAX;
97}
98
99static inline bool is_swiotlb_active(void)
100{
101 return false;
102}
103#endif /* CONFIG_SWIOTLB */
104
105extern void swiotlb_print_info(void);
106extern void swiotlb_set_max_segment(unsigned int);
107
108#endif /* __LINUX_SWIOTLB_H */