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
12enum swiotlb_force {
13 SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
14 SWIOTLB_FORCE, /* swiotlb=force */
15 SWIOTLB_NO_FORCE, /* swiotlb=noforce */
16};
17
18extern enum swiotlb_force swiotlb_force;
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);
38
39/*
40 * Enumeration for sync targets
41 */
42enum dma_sync_target {
43 SYNC_FOR_CPU = 0,
44 SYNC_FOR_DEVICE = 1,
45};
46
47/* define the last possible byte of physical address space as a mapping error */
48#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
49
50extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
51 dma_addr_t tbl_dma_addr,
52 phys_addr_t phys, size_t size,
53 enum dma_data_direction dir,
54 unsigned long attrs);
55
56extern void swiotlb_tbl_unmap_single(struct device *hwdev,
57 phys_addr_t tlb_addr,
58 size_t size, enum dma_data_direction dir,
59 unsigned long attrs);
60
61extern void swiotlb_tbl_sync_single(struct device *hwdev,
62 phys_addr_t tlb_addr,
63 size_t size, enum dma_data_direction dir,
64 enum dma_sync_target target);
65
66/* Accessory functions. */
67extern void
68*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
69 dma_addr_t *dma_handle, gfp_t flags);
70
71extern void
72swiotlb_free_coherent(struct device *hwdev, size_t size,
73 void *vaddr, dma_addr_t dma_handle);
74
75extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
76 unsigned long offset, size_t size,
77 enum dma_data_direction dir,
78 unsigned long attrs);
79extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
80 size_t size, enum dma_data_direction dir,
81 unsigned long attrs);
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);
117unsigned int swiotlb_max_segment(void);
118#else
119static inline void swiotlb_free(void) { }
120static inline unsigned int swiotlb_max_segment(void) { return 0; }
121#endif
122
123extern void swiotlb_print_info(void);
124extern int is_swiotlb_buffer(phys_addr_t paddr);
125extern void swiotlb_set_max_segment(unsigned int);
126
127#endif /* __LINUX_SWIOTLB_H */