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
9 struct device;
10 struct page;
11 struct scatterlist;
12
13 enum swiotlb_force {
14 SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
15 SWIOTLB_FORCE, /* swiotlb=force */
16 SWIOTLB_NO_FORCE, /* swiotlb=noforce */
17 };
18
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
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
32 extern void swiotlb_init(int verbose);
33 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
34 extern unsigned long swiotlb_nr_tbl(void);
35 unsigned long swiotlb_size_or_default(void);
36 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
37 extern void __init swiotlb_update_mem_attributes(void);
38
39 /*
40 * Enumeration for sync targets
41 */
42 enum dma_sync_target {
43 SYNC_FOR_CPU = 0,
44 SYNC_FOR_DEVICE = 1,
45 };
46
47 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
48 dma_addr_t tbl_dma_addr,
49 phys_addr_t phys,
50 size_t mapping_size,
51 size_t alloc_size,
52 enum dma_data_direction dir,
53 unsigned long attrs);
54
55 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
56 phys_addr_t tlb_addr,
57 size_t mapping_size,
58 size_t alloc_size,
59 enum dma_data_direction dir,
60 unsigned long attrs);
61
62 extern void swiotlb_tbl_sync_single(struct device *hwdev,
63 phys_addr_t tlb_addr,
64 size_t size, enum dma_data_direction dir,
65 enum dma_sync_target target);
66
67 #ifdef CONFIG_SWIOTLB
68 extern enum swiotlb_force swiotlb_force;
69 extern phys_addr_t io_tlb_start, io_tlb_end;
70
is_swiotlb_buffer(phys_addr_t paddr)71 static inline bool is_swiotlb_buffer(phys_addr_t paddr)
72 {
73 return paddr >= io_tlb_start && paddr < io_tlb_end;
74 }
75
76 bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr,
77 size_t size, enum dma_data_direction dir, unsigned long attrs);
78 void __init swiotlb_exit(void);
79 unsigned int swiotlb_max_segment(void);
80 size_t swiotlb_max_mapping_size(struct device *dev);
81 bool is_swiotlb_active(void);
82 #else
83 #define swiotlb_force SWIOTLB_NO_FORCE
is_swiotlb_buffer(phys_addr_t paddr)84 static inline bool is_swiotlb_buffer(phys_addr_t paddr)
85 {
86 return false;
87 }
swiotlb_map(struct device * dev,phys_addr_t * phys,dma_addr_t * dma_addr,size_t size,enum dma_data_direction dir,unsigned long attrs)88 static inline bool swiotlb_map(struct device *dev, phys_addr_t *phys,
89 dma_addr_t *dma_addr, size_t size, enum dma_data_direction dir,
90 unsigned long attrs)
91 {
92 return false;
93 }
swiotlb_exit(void)94 static inline void swiotlb_exit(void)
95 {
96 }
swiotlb_max_segment(void)97 static inline unsigned int swiotlb_max_segment(void)
98 {
99 return 0;
100 }
swiotlb_max_mapping_size(struct device * dev)101 static inline size_t swiotlb_max_mapping_size(struct device *dev)
102 {
103 return SIZE_MAX;
104 }
105
is_swiotlb_active(void)106 static inline bool is_swiotlb_active(void)
107 {
108 return false;
109 }
110 #endif /* CONFIG_SWIOTLB */
111
112 extern void swiotlb_print_info(void);
113 extern void swiotlb_set_max_segment(unsigned int);
114
115 #endif /* __LINUX_SWIOTLB_H */
116
