1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_SWIOTLB_H
3 #define __LINUX_SWIOTLB_H
4
5 #include <linux/dma-direction.h>
6 #include <linux/init.h>
7 #include <linux/types.h>
8 #include <linux/limits.h>
9
10 struct device;
11 struct page;
12 struct scatterlist;
13
14 enum swiotlb_force {
15 SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
16 SWIOTLB_FORCE, /* swiotlb=force */
17 SWIOTLB_NO_FORCE, /* swiotlb=noforce */
18 };
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
33 extern void swiotlb_init(int verbose);
34 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
35 extern unsigned long swiotlb_nr_tbl(void);
36 unsigned long swiotlb_size_or_default(void);
37 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
38 extern int swiotlb_late_init_with_default_size(size_t default_size);
39 extern void __init swiotlb_update_mem_attributes(void);
40
41 /*
42 * Enumeration for sync targets
43 */
44 enum dma_sync_target {
45 SYNC_FOR_CPU = 0,
46 SYNC_FOR_DEVICE = 1,
47 };
48
49 phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
50 size_t mapping_size, size_t alloc_size,
51 enum dma_data_direction dir, unsigned long attrs);
52
53 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
54 phys_addr_t tlb_addr,
55 size_t mapping_size,
56 size_t alloc_size,
57 enum dma_data_direction dir,
58 unsigned long attrs);
59
60 extern void swiotlb_tbl_sync_single(struct device *hwdev,
61 phys_addr_t tlb_addr,
62 size_t size, enum dma_data_direction dir,
63 enum dma_sync_target target);
64
65 dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
66 size_t size, enum dma_data_direction dir, unsigned long attrs);
67
68 #ifdef CONFIG_SWIOTLB
69 extern enum swiotlb_force swiotlb_force;
70 extern phys_addr_t io_tlb_start, io_tlb_end;
71
is_swiotlb_buffer(phys_addr_t paddr)72 static inline bool is_swiotlb_buffer(phys_addr_t paddr)
73 {
74 return paddr >= io_tlb_start && paddr < io_tlb_end;
75 }
76
77 void __init swiotlb_exit(void);
78 unsigned int swiotlb_max_segment(void);
79 size_t swiotlb_max_mapping_size(struct device *dev);
80 bool is_swiotlb_active(void);
81 #else
82 #define swiotlb_force SWIOTLB_NO_FORCE
is_swiotlb_buffer(phys_addr_t paddr)83 static inline bool is_swiotlb_buffer(phys_addr_t paddr)
84 {
85 return false;
86 }
swiotlb_exit(void)87 static inline void swiotlb_exit(void)
88 {
89 }
swiotlb_max_segment(void)90 static inline unsigned int swiotlb_max_segment(void)
91 {
92 return 0;
93 }
swiotlb_max_mapping_size(struct device * dev)94 static inline size_t swiotlb_max_mapping_size(struct device *dev)
95 {
96 return SIZE_MAX;
97 }
98
is_swiotlb_active(void)99 static inline bool is_swiotlb_active(void)
100 {
101 return false;
102 }
103 #endif /* CONFIG_SWIOTLB */
104
105 extern void swiotlb_print_info(void);
106 extern void swiotlb_set_max_segment(unsigned int);
107
108 #endif /* __LINUX_SWIOTLB_H */
109
