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 int swiotlb_late_init_with_default_size(size_t default_size); 38 extern void __init swiotlb_update_mem_attributes(void); 39 40 /* 41 * Enumeration for sync targets 42 */ 43 enum dma_sync_target { 44 SYNC_FOR_CPU = 0, 45 SYNC_FOR_DEVICE = 1, 46 }; 47 48 phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys, 49 size_t mapping_size, size_t alloc_size, 50 enum dma_data_direction dir, unsigned long attrs); 51 52 extern void swiotlb_tbl_unmap_single(struct device *hwdev, 53 phys_addr_t tlb_addr, 54 size_t mapping_size, 55 size_t alloc_size, 56 enum dma_data_direction dir, 57 unsigned long attrs); 58 59 extern void swiotlb_tbl_sync_single(struct device *hwdev, 60 phys_addr_t tlb_addr, 61 size_t size, enum dma_data_direction dir, 62 enum dma_sync_target target); 63 64 dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys, 65 size_t size, enum dma_data_direction dir, unsigned long attrs); 66 67 #ifdef CONFIG_SWIOTLB 68 extern enum swiotlb_force swiotlb_force; 69 extern phys_addr_t io_tlb_start, io_tlb_end; 70 71 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 72 { 73 return paddr >= io_tlb_start && paddr < io_tlb_end; 74 } 75 76 void __init swiotlb_exit(void); 77 unsigned int swiotlb_max_segment(void); 78 size_t swiotlb_max_mapping_size(struct device *dev); 79 bool is_swiotlb_active(void); 80 #else 81 #define swiotlb_force SWIOTLB_NO_FORCE 82 static inline bool is_swiotlb_buffer(phys_addr_t paddr) 83 { 84 return false; 85 } 86 static inline void swiotlb_exit(void) 87 { 88 } 89 static inline unsigned int swiotlb_max_segment(void) 90 { 91 return 0; 92 } 93 static inline size_t swiotlb_max_mapping_size(struct device *dev) 94 { 95 return SIZE_MAX; 96 } 97 98 static inline bool is_swiotlb_active(void) 99 { 100 return false; 101 } 102 #endif /* CONFIG_SWIOTLB */ 103 104 extern void swiotlb_print_info(void); 105 extern void swiotlb_set_max_segment(unsigned int); 106 107 #endif /* __LINUX_SWIOTLB_H */ 108