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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1648993f JR |
2 | #ifndef __LINUX_SWIOTLB_H |
3 | #define __LINUX_SWIOTLB_H | |
4 | ||
38674442 TR |
5 | #include <linux/dma-direction.h> |
6 | #include <linux/init.h> | |
1648993f JR |
7 | #include <linux/types.h> |
8 | ||
9 | struct device; | |
38674442 | 10 | struct page; |
1648993f JR |
11 | struct scatterlist; |
12 | ||
ae7871be GU |
13 | enum swiotlb_force { |
14 | SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */ | |
15 | SWIOTLB_FORCE, /* swiotlb=force */ | |
fff5d992 | 16 | SWIOTLB_NO_FORCE, /* swiotlb=noforce */ |
ae7871be GU |
17 | }; |
18 | ||
0016fdee IC |
19 | /* |
20 | * Maximum allowable number of contiguous slabs to map, | |
21 | * must be a power of 2. What is the appropriate value ? | |
22 | * The complexity of {map,unmap}_single is linearly dependent on this value. | |
23 | */ | |
24 | #define IO_TLB_SEGSIZE 128 | |
25 | ||
0016fdee IC |
26 | /* |
27 | * log of the size of each IO TLB slab. The number of slabs is command line | |
28 | * controllable. | |
29 | */ | |
30 | #define IO_TLB_SHIFT 11 | |
31 | ||
ad32e8cb | 32 | extern void swiotlb_init(int verbose); |
ac2cbab2 | 33 | int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); |
f21ffe9f | 34 | extern unsigned long swiotlb_nr_tbl(void); |
c729de8f | 35 | unsigned long swiotlb_size_or_default(void); |
74838b75 | 36 | extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); |
c7753208 | 37 | extern void __init swiotlb_update_mem_attributes(void); |
1648993f | 38 | |
d7ef1533 KRW |
39 | /* |
40 | * Enumeration for sync targets | |
41 | */ | |
42 | enum dma_sync_target { | |
43 | SYNC_FOR_CPU = 0, | |
44 | SYNC_FOR_DEVICE = 1, | |
45 | }; | |
e05ed4d1 | 46 | |
e05ed4d1 AD |
47 | extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, |
48 | dma_addr_t tbl_dma_addr, | |
49 | phys_addr_t phys, size_t size, | |
0443fa00 AD |
50 | enum dma_data_direction dir, |
51 | unsigned long attrs); | |
d7ef1533 | 52 | |
61ca08c3 AD |
53 | extern void swiotlb_tbl_unmap_single(struct device *hwdev, |
54 | phys_addr_t tlb_addr, | |
0443fa00 AD |
55 | size_t size, enum dma_data_direction dir, |
56 | unsigned long attrs); | |
d7ef1533 | 57 | |
fbfda893 AD |
58 | extern void swiotlb_tbl_sync_single(struct device *hwdev, |
59 | phys_addr_t tlb_addr, | |
d7ef1533 KRW |
60 | size_t size, enum dma_data_direction dir, |
61 | enum dma_sync_target target); | |
62 | ||
5740afdb | 63 | #ifdef CONFIG_SWIOTLB |
55897af6 CH |
64 | extern enum swiotlb_force swiotlb_force; |
65 | extern phys_addr_t io_tlb_start, io_tlb_end; | |
66 | ||
67 | static inline bool is_swiotlb_buffer(phys_addr_t paddr) | |
68 | { | |
69 | return paddr >= io_tlb_start && paddr < io_tlb_end; | |
70 | } | |
71 | ||
72 | bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr, | |
73 | size_t size, enum dma_data_direction dir, unsigned long attrs); | |
74 | void __init swiotlb_exit(void); | |
7453c549 | 75 | unsigned int swiotlb_max_segment(void); |
abe420bf | 76 | size_t swiotlb_max_mapping_size(struct device *dev); |
492366f7 | 77 | bool is_swiotlb_active(void); |
5740afdb | 78 | #else |
55897af6 CH |
79 | #define swiotlb_force SWIOTLB_NO_FORCE |
80 | static inline bool is_swiotlb_buffer(phys_addr_t paddr) | |
81 | { | |
82 | return false; | |
83 | } | |
84 | static inline bool swiotlb_map(struct device *dev, phys_addr_t *phys, | |
85 | dma_addr_t *dma_addr, size_t size, enum dma_data_direction dir, | |
86 | unsigned long attrs) | |
87 | { | |
88 | return false; | |
89 | } | |
90 | static inline void swiotlb_exit(void) | |
91 | { | |
92 | } | |
93 | static inline unsigned int swiotlb_max_segment(void) | |
94 | { | |
95 | return 0; | |
96 | } | |
abe420bf JR |
97 | static inline size_t swiotlb_max_mapping_size(struct device *dev) |
98 | { | |
99 | return SIZE_MAX; | |
100 | } | |
492366f7 JR |
101 | |
102 | static inline bool is_swiotlb_active(void) | |
103 | { | |
104 | return false; | |
105 | } | |
55897af6 | 106 | #endif /* CONFIG_SWIOTLB */ |
5740afdb | 107 | |
ad32e8cb | 108 | extern void swiotlb_print_info(void); |
7453c549 | 109 | extern void swiotlb_set_max_segment(unsigned int); |
9c5a3621 | 110 | |
1648993f | 111 | #endif /* __LINUX_SWIOTLB_H */ |