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, size_t size, 50 enum dma_data_direction dir, 51 unsigned long attrs); 52 53 extern void swiotlb_tbl_unmap_single(struct device *hwdev, 54 phys_addr_t tlb_addr, 55 size_t size, enum dma_data_direction dir, 56 unsigned long attrs); 57 58 extern void swiotlb_tbl_sync_single(struct device *hwdev, 59 phys_addr_t tlb_addr, 60 size_t size, enum dma_data_direction dir, 61 enum dma_sync_target target); 62 63 #ifdef CONFIG_SWIOTLB 64 extern enum swiotlb_force swiotlb_force; 65 extern phys_addr_t io_tlb_start, io_tlb_end; 66 67 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 68 { 69 return paddr >= io_tlb_start && paddr < io_tlb_end; 70 } 71 72 bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr, 73 size_t size, enum dma_data_direction dir, unsigned long attrs); 74 void __init swiotlb_exit(void); 75 unsigned int swiotlb_max_segment(void); 76 size_t swiotlb_max_mapping_size(struct device *dev); 77 bool is_swiotlb_active(void); 78 #else 79 #define swiotlb_force SWIOTLB_NO_FORCE 80 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 81 { 82 return false; 83 } 84 static inline bool swiotlb_map(struct device *dev, phys_addr_t *phys, 85 dma_addr_t *dma_addr, size_t size, enum dma_data_direction dir, 86 unsigned long attrs) 87 { 88 return false; 89 } 90 static inline void swiotlb_exit(void) 91 { 92 } 93 static inline unsigned int swiotlb_max_segment(void) 94 { 95 return 0; 96 } 97 static inline size_t swiotlb_max_mapping_size(struct device *dev) 98 { 99 return SIZE_MAX; 100 } 101 102 static inline bool is_swiotlb_active(void) 103 { 104 return false; 105 } 106 #endif /* CONFIG_SWIOTLB */ 107 108 extern void swiotlb_print_info(void); 109 extern void swiotlb_set_max_segment(unsigned int); 110 111 #endif /* __LINUX_SWIOTLB_H */ 112