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);
68 extern enum swiotlb_force swiotlb_force;
69 extern phys_addr_t io_tlb_start, io_tlb_end;
71 static inline bool is_swiotlb_buffer(phys_addr_t paddr)
73 return paddr >= io_tlb_start && paddr < io_tlb_end;
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);
83 #define swiotlb_force SWIOTLB_NO_FORCE
84 static inline bool is_swiotlb_buffer(phys_addr_t paddr)
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,
94 static inline void swiotlb_exit(void)
97 static inline unsigned int swiotlb_max_segment(void)
101 static inline size_t swiotlb_max_mapping_size(struct device *dev)
106 static inline bool is_swiotlb_active(void)
110 #endif /* CONFIG_SWIOTLB */
112 extern void swiotlb_print_info(void);
113 extern void swiotlb_set_max_segment(unsigned int);
115 #endif /* __LINUX_SWIOTLB_H */