1 #ifndef __LINUX_SWIOTLB_H
2 #define __LINUX_SWIOTLB_H
4 #include <linux/dma-direction.h>
5 #include <linux/init.h>
6 #include <linux/types.h>
13 SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
14 SWIOTLB_FORCE, /* swiotlb=force */
15 SWIOTLB_NO_FORCE, /* swiotlb=noforce */
18 extern enum swiotlb_force swiotlb_force;
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.
25 #define IO_TLB_SEGSIZE 128
28 * log of the size of each IO TLB slab. The number of slabs is command line
31 #define IO_TLB_SHIFT 11
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);
40 * Enumeration for sync targets
42 enum dma_sync_target {
47 /* define the last possible byte of physical address space as a mapping error */
48 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
50 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
51 dma_addr_t tbl_dma_addr,
52 phys_addr_t phys, size_t size,
53 enum dma_data_direction dir);
55 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
57 size_t size, enum dma_data_direction dir);
59 extern void swiotlb_tbl_sync_single(struct device *hwdev,
61 size_t size, enum dma_data_direction dir,
62 enum dma_sync_target target);
64 /* Accessory functions. */
66 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
67 dma_addr_t *dma_handle, gfp_t flags);
70 swiotlb_free_coherent(struct device *hwdev, size_t size,
71 void *vaddr, dma_addr_t dma_handle);
73 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
74 unsigned long offset, size_t size,
75 enum dma_data_direction dir,
77 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
78 size_t size, enum dma_data_direction dir,
82 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
83 enum dma_data_direction dir);
86 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
87 enum dma_data_direction dir);
90 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
91 enum dma_data_direction dir,
95 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
96 int nelems, enum dma_data_direction dir,
100 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
101 size_t size, enum dma_data_direction dir);
104 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
105 int nelems, enum dma_data_direction dir);
108 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
109 size_t size, enum dma_data_direction dir);
112 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
113 int nelems, enum dma_data_direction dir);
116 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
119 swiotlb_dma_supported(struct device *hwdev, u64 mask);
121 #ifdef CONFIG_SWIOTLB
122 extern void __init swiotlb_free(void);
124 static inline void swiotlb_free(void) { }
127 extern void swiotlb_print_info(void);
128 extern int is_swiotlb_buffer(phys_addr_t paddr);
130 #endif /* __LINUX_SWIOTLB_H */