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 #include <linux/limits.h> 9 10 struct device; 11 struct page; 12 struct scatterlist; 13 14 enum swiotlb_force { 15 SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */ 16 SWIOTLB_FORCE, /* swiotlb=force */ 17 SWIOTLB_NO_FORCE, /* swiotlb=noforce */ 18 }; 19 20 /* 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. 24 */ 25 #define IO_TLB_SEGSIZE 128 26 27 /* 28 * log of the size of each IO TLB slab. The number of slabs is command line 29 * controllable. 30 */ 31 #define IO_TLB_SHIFT 11 32 33 /* default to 64MB */ 34 #define IO_TLB_DEFAULT_SIZE (64UL<<20) 35 36 extern void swiotlb_init(int verbose); 37 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose); 38 extern unsigned long swiotlb_nr_tbl(void); 39 unsigned long swiotlb_size_or_default(void); 40 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs); 41 extern int swiotlb_late_init_with_default_size(size_t default_size); 42 extern void __init swiotlb_update_mem_attributes(void); 43 44 /* 45 * Enumeration for sync targets 46 */ 47 enum dma_sync_target { 48 SYNC_FOR_CPU = 0, 49 SYNC_FOR_DEVICE = 1, 50 }; 51 52 phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys, 53 size_t mapping_size, size_t alloc_size, 54 enum dma_data_direction dir, unsigned long attrs); 55 56 extern void swiotlb_tbl_unmap_single(struct device *hwdev, 57 phys_addr_t tlb_addr, 58 size_t mapping_size, 59 size_t alloc_size, 60 enum dma_data_direction dir, 61 unsigned long attrs); 62 63 extern void swiotlb_tbl_sync_single(struct device *hwdev, 64 phys_addr_t tlb_addr, 65 size_t size, enum dma_data_direction dir, 66 enum dma_sync_target target); 67 68 dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys, 69 size_t size, enum dma_data_direction dir, unsigned long attrs); 70 71 #ifdef CONFIG_SWIOTLB 72 extern enum swiotlb_force swiotlb_force; 73 extern phys_addr_t io_tlb_start, io_tlb_end; 74 75 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 76 { 77 return paddr >= io_tlb_start && paddr < io_tlb_end; 78 } 79 80 void __init swiotlb_exit(void); 81 unsigned int swiotlb_max_segment(void); 82 size_t swiotlb_max_mapping_size(struct device *dev); 83 bool is_swiotlb_active(void); 84 void __init swiotlb_adjust_size(unsigned long new_size); 85 #else 86 #define swiotlb_force SWIOTLB_NO_FORCE 87 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 88 { 89 return false; 90 } 91 static inline void swiotlb_exit(void) 92 { 93 } 94 static inline unsigned int swiotlb_max_segment(void) 95 { 96 return 0; 97 } 98 static inline size_t swiotlb_max_mapping_size(struct device *dev) 99 { 100 return SIZE_MAX; 101 } 102 103 static inline bool is_swiotlb_active(void) 104 { 105 return false; 106 } 107 108 static inline void swiotlb_adjust_size(unsigned long new_size) 109 { 110 } 111 #endif /* CONFIG_SWIOTLB */ 112 113 extern void swiotlb_print_info(void); 114 extern void swiotlb_set_max_segment(unsigned int); 115 116 #endif /* __LINUX_SWIOTLB_H */ 117