#ifndef __LINUX_SWIOTLB_H #define __LINUX_SWIOTLB_H #include <linux/types.h> struct device; struct dma_attrs; struct scatterlist; extern int swiotlb_force; /* * 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); /* * Enumeration for sync targets */ enum dma_sync_target { SYNC_FOR_CPU = 0, SYNC_FOR_DEVICE = 1, }; /* define the last possible byte of physical address space as a mapping error */ #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0) extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr, phys_addr_t phys, size_t size, enum dma_data_direction dir); extern void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr, size_t size, enum dma_data_direction dir); 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); /* Accessory functions. */ extern void *swiotlb_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t flags); extern void swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle); extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); extern int swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, enum dma_data_direction dir); extern void swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents, enum dma_data_direction dir); extern int swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, enum dma_data_direction dir, struct dma_attrs *attrs); extern void swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, enum dma_data_direction dir, struct dma_attrs *attrs); extern void swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, size_t size, enum dma_data_direction dir); extern void swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, int nelems, enum dma_data_direction dir); extern void swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, size_t size, enum dma_data_direction dir); extern void swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, int nelems, enum dma_data_direction dir); extern int swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); extern int swiotlb_dma_supported(struct device *hwdev, u64 mask); #ifdef CONFIG_SWIOTLB extern void __init swiotlb_free(void); #else static inline void swiotlb_free(void) { } #endif extern void swiotlb_print_info(void); #endif /* __LINUX_SWIOTLB_H */