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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef __LINUX_SWIOTLB_H
- #define __LINUX_SWIOTLB_H
- #include <linux/dma-direction.h>
- #include <linux/init.h>
- #include <linux/types.h>
- #include <linux/limits.h>
- struct device;
- struct page;
- struct scatterlist;
- enum swiotlb_force {
- SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
- SWIOTLB_FORCE, /* swiotlb=force */
- SWIOTLB_NO_FORCE, /* swiotlb=noforce */
- };
- /*
- * Maximum allowable number of contiguous slabs to map,
- * must be a power of 2. What is the appropriate value ?
- * The complexity of {map,unmap}_single is linearly dependent on this value.
- */
- #define IO_TLB_SEGSIZE 128
- /*
- * log of the size of each IO TLB slab. The number of slabs is command line
- * controllable.
- */
- #define IO_TLB_SHIFT 11
- extern void swiotlb_init(int verbose);
- int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
- extern unsigned long swiotlb_nr_tbl(void);
- unsigned long swiotlb_size_or_default(void);
- extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
- extern void __init swiotlb_update_mem_attributes(void);
- /*
- * Enumeration for sync targets
- */
- enum dma_sync_target {
- SYNC_FOR_CPU = 0,
- SYNC_FOR_DEVICE = 1,
- };
- extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
- dma_addr_t tbl_dma_addr,
- phys_addr_t phys,
- size_t mapping_size,
- size_t alloc_size,
- enum dma_data_direction dir,
- unsigned long attrs);
- extern void swiotlb_tbl_unmap_single(struct device *hwdev,
- phys_addr_t tlb_addr,
- size_t mapping_size,
- size_t alloc_size,
- enum dma_data_direction dir,
- unsigned long attrs);
- extern void swiotlb_tbl_sync_single(struct device *hwdev,
- phys_addr_t tlb_addr,
- size_t size, enum dma_data_direction dir,
- enum dma_sync_target target);
- #ifdef CONFIG_SWIOTLB
- extern enum swiotlb_force swiotlb_force;
- extern phys_addr_t io_tlb_start, io_tlb_end;
- static inline bool is_swiotlb_buffer(phys_addr_t paddr)
- {
- return paddr >= io_tlb_start && paddr < io_tlb_end;
- }
- bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr,
- size_t size, enum dma_data_direction dir, unsigned long attrs);
- void __init swiotlb_exit(void);
- unsigned int swiotlb_max_segment(void);
- size_t swiotlb_max_mapping_size(struct device *dev);
- bool is_swiotlb_active(void);
- #else
- #define swiotlb_force SWIOTLB_NO_FORCE
- static inline bool is_swiotlb_buffer(phys_addr_t paddr)
- {
- return false;
- }
- static inline bool swiotlb_map(struct device *dev, phys_addr_t *phys,
- dma_addr_t *dma_addr, size_t size, enum dma_data_direction dir,
- unsigned long attrs)
- {
- return false;
- }
- static inline void swiotlb_exit(void)
- {
- }
- static inline unsigned int swiotlb_max_segment(void)
- {
- return 0;
- }
- static inline size_t swiotlb_max_mapping_size(struct device *dev)
- {
- return SIZE_MAX;
- }
- static inline bool is_swiotlb_active(void)
- {
- return false;
- }
- #endif /* CONFIG_SWIOTLB */
- extern void swiotlb_print_info(void);
- extern void swiotlb_set_max_segment(unsigned int);
- #endif /* __LINUX_SWIOTLB_H */
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