tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __LINUX_SWIOTLB_H
2#define __LINUX_SWIOTLB_H
3
4#include <linux/types.h>
5
6struct device;
7struct dma_attrs;
8struct scatterlist;
9
10/*
11 * Maximum allowable number of contiguous slabs to map,
12 * must be a power of 2. What is the appropriate value ?
13 * The complexity of {map,unmap}_single is linearly dependent on this value.
14 */
15#define IO_TLB_SEGSIZE 128
16
17
18/*
19 * log of the size of each IO TLB slab. The number of slabs is command line
20 * controllable.
21 */
22#define IO_TLB_SHIFT 11
23
24extern void
25swiotlb_init(void);
26
27extern void *swiotlb_alloc_boot(size_t bytes, unsigned long nslabs);
28extern void *swiotlb_alloc(unsigned order, unsigned long nslabs);
29
30extern dma_addr_t swiotlb_phys_to_bus(struct device *hwdev,
31 phys_addr_t address);
32extern phys_addr_t swiotlb_bus_to_phys(dma_addr_t address);
33
34extern int swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size);
35
36extern void
37*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
38 dma_addr_t *dma_handle, gfp_t flags);
39
40extern void
41swiotlb_free_coherent(struct device *hwdev, size_t size,
42 void *vaddr, dma_addr_t dma_handle);
43
44extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
45 unsigned long offset, size_t size,
46 enum dma_data_direction dir,
47 struct dma_attrs *attrs);
48extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
49 size_t size, enum dma_data_direction dir,
50 struct dma_attrs *attrs);
51
52extern int
53swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
54 int direction);
55
56extern void
57swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
58 int direction);
59
60extern int
61swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
62 enum dma_data_direction dir, struct dma_attrs *attrs);
63
64extern void
65swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
66 int nelems, enum dma_data_direction dir,
67 struct dma_attrs *attrs);
68
69extern void
70swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
71 size_t size, enum dma_data_direction dir);
72
73extern void
74swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
75 int nelems, enum dma_data_direction dir);
76
77extern void
78swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
79 size_t size, enum dma_data_direction dir);
80
81extern void
82swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
83 int nelems, enum dma_data_direction dir);
84
85extern void
86swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
87 unsigned long offset, size_t size,
88 enum dma_data_direction dir);
89
90extern void
91swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
92 unsigned long offset, size_t size,
93 enum dma_data_direction dir);
94
95extern int
96swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
97
98extern int
99swiotlb_dma_supported(struct device *hwdev, u64 mask);
100
101#endif /* __LINUX_SWIOTLB_H */