Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef __LINUX_SWIOTLB_H
2#define __LINUX_SWIOTLB_H
3
4#include <linux/dma-direction.h>
5#include <linux/init.h>
6#include <linux/types.h>
7
8struct device;
9struct page;
10struct scatterlist;
11
12extern int swiotlb_force;
13
14/*
15 * Maximum allowable number of contiguous slabs to map,
16 * must be a power of 2. What is the appropriate value ?
17 * The complexity of {map,unmap}_single is linearly dependent on this value.
18 */
19#define IO_TLB_SEGSIZE 128
20
21/*
22 * log of the size of each IO TLB slab. The number of slabs is command line
23 * controllable.
24 */
25#define IO_TLB_SHIFT 11
26
27extern void swiotlb_init(int verbose);
28int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
29extern unsigned long swiotlb_nr_tbl(void);
30unsigned long swiotlb_size_or_default(void);
31extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
32
33/*
34 * Enumeration for sync targets
35 */
36enum dma_sync_target {
37 SYNC_FOR_CPU = 0,
38 SYNC_FOR_DEVICE = 1,
39};
40
41/* define the last possible byte of physical address space as a mapping error */
42#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
43
44extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
45 dma_addr_t tbl_dma_addr,
46 phys_addr_t phys, size_t size,
47 enum dma_data_direction dir);
48
49extern void swiotlb_tbl_unmap_single(struct device *hwdev,
50 phys_addr_t tlb_addr,
51 size_t size, enum dma_data_direction dir);
52
53extern void swiotlb_tbl_sync_single(struct device *hwdev,
54 phys_addr_t tlb_addr,
55 size_t size, enum dma_data_direction dir,
56 enum dma_sync_target target);
57
58/* Accessory functions. */
59extern void
60*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
61 dma_addr_t *dma_handle, gfp_t flags);
62
63extern void
64swiotlb_free_coherent(struct device *hwdev, size_t size,
65 void *vaddr, dma_addr_t dma_handle);
66
67extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
68 unsigned long offset, size_t size,
69 enum dma_data_direction dir,
70 unsigned long attrs);
71extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
72 size_t size, enum dma_data_direction dir,
73 unsigned long attrs);
74
75extern int
76swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
77 enum dma_data_direction dir);
78
79extern void
80swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
81 enum dma_data_direction dir);
82
83extern int
84swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
85 enum dma_data_direction dir,
86 unsigned long attrs);
87
88extern void
89swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
90 int nelems, enum dma_data_direction dir,
91 unsigned long attrs);
92
93extern void
94swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
95 size_t size, enum dma_data_direction dir);
96
97extern void
98swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
99 int nelems, enum dma_data_direction dir);
100
101extern void
102swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
103 size_t size, enum dma_data_direction dir);
104
105extern void
106swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
107 int nelems, enum dma_data_direction dir);
108
109extern int
110swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
111
112extern int
113swiotlb_dma_supported(struct device *hwdev, u64 mask);
114
115#ifdef CONFIG_SWIOTLB
116extern void __init swiotlb_free(void);
117#else
118static inline void swiotlb_free(void) { }
119#endif
120
121extern void swiotlb_print_info(void);
122extern int is_swiotlb_buffer(phys_addr_t paddr);
123
124#endif /* __LINUX_SWIOTLB_H */