1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_SWIOTLB_H
3 #define __LINUX_SWIOTLB_H
5 #include <linux/dma-direction.h>
6 #include <linux/init.h>
7 #include <linux/types.h>
14 SWIOTLB_NORMAL
, /* Default - depending on HW DMA mask etc. */
15 SWIOTLB_FORCE
, /* swiotlb=force */
16 SWIOTLB_NO_FORCE
, /* swiotlb=noforce */
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.
24 #define IO_TLB_SEGSIZE 128
27 * log of the size of each IO TLB slab. The number of slabs is command line
30 #define IO_TLB_SHIFT 11
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);
40 * Enumeration for sync targets
42 enum dma_sync_target
{
47 extern phys_addr_t
swiotlb_tbl_map_single(struct device
*hwdev
,
48 dma_addr_t tbl_dma_addr
,
52 enum dma_data_direction dir
,
55 extern void swiotlb_tbl_unmap_single(struct device
*hwdev
,
59 enum dma_data_direction dir
,
62 extern void swiotlb_tbl_sync_single(struct device
*hwdev
,
64 size_t size
, enum dma_data_direction dir
,
65 enum dma_sync_target target
);
67 dma_addr_t
swiotlb_map(struct device
*dev
, phys_addr_t phys
,
68 size_t size
, enum dma_data_direction dir
, unsigned long attrs
);
71 extern enum swiotlb_force swiotlb_force
;
72 extern phys_addr_t io_tlb_start
, io_tlb_end
;
74 static inline bool is_swiotlb_buffer(phys_addr_t paddr
)
76 return paddr
>= io_tlb_start
&& paddr
< io_tlb_end
;
79 void __init
swiotlb_exit(void);
80 unsigned int swiotlb_max_segment(void);
81 size_t swiotlb_max_mapping_size(struct device
*dev
);
82 bool is_swiotlb_active(void);
84 #define swiotlb_force SWIOTLB_NO_FORCE
85 static inline bool is_swiotlb_buffer(phys_addr_t paddr
)
89 static inline void swiotlb_exit(void)
92 static inline unsigned int swiotlb_max_segment(void)
96 static inline size_t swiotlb_max_mapping_size(struct device
*dev
)
101 static inline bool is_swiotlb_active(void)
105 #endif /* CONFIG_SWIOTLB */
107 extern void swiotlb_print_info(void);
108 extern void swiotlb_set_max_segment(unsigned int);
110 #endif /* __LINUX_SWIOTLB_H */