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 */
19 extern enum swiotlb_force swiotlb_force;
22 * Maximum allowable number of contiguous slabs to map,
23 * must be a power of 2. What is the appropriate value ?
24 * The complexity of {map,unmap}_single is linearly dependent on this value.
26 #define IO_TLB_SEGSIZE 128
29 * log of the size of each IO TLB slab. The number of slabs is command line
32 #define IO_TLB_SHIFT 11
34 extern void swiotlb_init(int verbose);
35 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
36 extern unsigned long swiotlb_nr_tbl(void);
37 unsigned long swiotlb_size_or_default(void);
38 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
39 extern void __init swiotlb_update_mem_attributes(void);
42 * Enumeration for sync targets
44 enum dma_sync_target {
49 /* define the last possible byte of physical address space as a mapping error */
50 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
52 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
53 dma_addr_t tbl_dma_addr,
54 phys_addr_t phys, size_t size,
55 enum dma_data_direction dir,
58 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
60 size_t size, enum dma_data_direction dir,
63 extern void swiotlb_tbl_sync_single(struct device *hwdev,
65 size_t size, enum dma_data_direction dir,
66 enum dma_sync_target target);
68 /* Accessory functions. */
70 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
71 unsigned long offset, size_t size,
72 enum dma_data_direction dir,
74 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
75 size_t size, enum dma_data_direction dir,
79 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
80 enum dma_data_direction dir,
84 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
85 int nelems, enum dma_data_direction dir,
89 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
90 size_t size, enum dma_data_direction dir);
93 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
94 int nelems, enum dma_data_direction dir);
97 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
98 size_t size, enum dma_data_direction dir);
101 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
102 int nelems, enum dma_data_direction dir);
105 swiotlb_dma_supported(struct device *hwdev, u64 mask);
107 #ifdef CONFIG_SWIOTLB
108 extern void __init swiotlb_exit(void);
109 unsigned int swiotlb_max_segment(void);
111 static inline void swiotlb_exit(void) { }
112 static inline unsigned int swiotlb_max_segment(void) { return 0; }
115 extern void swiotlb_print_info(void);
116 extern void swiotlb_set_max_segment(unsigned int);
118 extern const struct dma_map_ops swiotlb_dma_ops;
120 #endif /* __LINUX_SWIOTLB_H */