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 dma_attrs;
10struct page;
11struct scatterlist;
12
13extern int swiotlb_force;
14
15/*
16 * Maximum allowable number of contiguous slabs to map,
17 * must be a power of 2. What is the appropriate value ?
18 * The complexity of {map,unmap}_single is linearly dependent on this value.
19 */
20#define IO_TLB_SEGSIZE 128
21
22/*
23 * log of the size of each IO TLB slab. The number of slabs is command line
24 * controllable.
25 */
26#define IO_TLB_SHIFT 11
27
28extern void swiotlb_init(int verbose);
29int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
30extern unsigned long swiotlb_nr_tbl(void);
31unsigned long swiotlb_size_or_default(void);
32extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
33
34/*
35 * Enumeration for sync targets
36 */
37enum dma_sync_target {
38 SYNC_FOR_CPU = 0,
39 SYNC_FOR_DEVICE = 1,
40};
41
42/* define the last possible byte of physical address space as a mapping error */
43#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
44
45extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
46 dma_addr_t tbl_dma_addr,
47 phys_addr_t phys, size_t size,
48 enum dma_data_direction dir);
49
50extern void swiotlb_tbl_unmap_single(struct device *hwdev,
51 phys_addr_t tlb_addr,
52 size_t size, enum dma_data_direction dir);
53
54extern void swiotlb_tbl_sync_single(struct device *hwdev,
55 phys_addr_t tlb_addr,
56 size_t size, enum dma_data_direction dir,
57 enum dma_sync_target target);
58
59/* Accessory functions. */
60extern void
61*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
62 dma_addr_t *dma_handle, gfp_t flags);
63
64extern void
65swiotlb_free_coherent(struct device *hwdev, size_t size,
66 void *vaddr, dma_addr_t dma_handle);
67
68extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
69 unsigned long offset, size_t size,
70 enum dma_data_direction dir,
71 struct dma_attrs *attrs);
72extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
73 size_t size, enum dma_data_direction dir,
74 struct dma_attrs *attrs);
75
76extern int
77swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
78 enum dma_data_direction dir);
79
80extern void
81swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
82 enum dma_data_direction dir);
83
84extern int
85swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
86 enum dma_data_direction dir, struct dma_attrs *attrs);
87
88extern void
89swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
90 int nelems, enum dma_data_direction dir,
91 struct dma_attrs *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 */