125 строки
3.6 KiB
C
125 строки
3.6 KiB
C
#ifndef __LINUX_SWIOTLB_H
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#define __LINUX_SWIOTLB_H
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#include <linux/dma-direction.h>
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#include <linux/init.h>
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#include <linux/types.h>
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struct device;
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struct dma_attrs;
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struct page;
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struct scatterlist;
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extern int swiotlb_force;
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/*
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* Maximum allowable number of contiguous slabs to map,
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* must be a power of 2. What is the appropriate value ?
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* The complexity of {map,unmap}_single is linearly dependent on this value.
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*/
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#define IO_TLB_SEGSIZE 128
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/*
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* log of the size of each IO TLB slab. The number of slabs is command line
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* controllable.
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*/
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#define IO_TLB_SHIFT 11
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extern void swiotlb_init(int verbose);
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int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
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extern unsigned long swiotlb_nr_tbl(void);
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unsigned long swiotlb_size_or_default(void);
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extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
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/*
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* Enumeration for sync targets
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*/
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enum dma_sync_target {
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SYNC_FOR_CPU = 0,
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SYNC_FOR_DEVICE = 1,
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};
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/* define the last possible byte of physical address space as a mapping error */
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#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
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extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
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dma_addr_t tbl_dma_addr,
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phys_addr_t phys, size_t size,
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enum dma_data_direction dir);
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extern void swiotlb_tbl_unmap_single(struct device *hwdev,
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phys_addr_t tlb_addr,
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size_t size, enum dma_data_direction dir);
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extern void swiotlb_tbl_sync_single(struct device *hwdev,
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phys_addr_t tlb_addr,
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size_t size, enum dma_data_direction dir,
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enum dma_sync_target target);
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/* Accessory functions. */
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extern void
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*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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dma_addr_t *dma_handle, gfp_t flags);
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extern void
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swiotlb_free_coherent(struct device *hwdev, size_t size,
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void *vaddr, dma_addr_t dma_handle);
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extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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struct dma_attrs *attrs);
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extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, enum dma_data_direction dir,
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struct dma_attrs *attrs);
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extern int
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swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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extern void
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swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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extern int
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swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
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enum dma_data_direction dir, struct dma_attrs *attrs);
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extern void
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swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
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int nelems, enum dma_data_direction dir,
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struct dma_attrs *attrs);
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extern void
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swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, enum dma_data_direction dir);
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extern void
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swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
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int nelems, enum dma_data_direction dir);
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extern void
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swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, enum dma_data_direction dir);
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extern void
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swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
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int nelems, enum dma_data_direction dir);
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extern int
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swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
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extern int
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swiotlb_dma_supported(struct device *hwdev, u64 mask);
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#ifdef CONFIG_SWIOTLB
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extern void __init swiotlb_free(void);
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#else
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static inline void swiotlb_free(void) { }
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#endif
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extern void swiotlb_print_info(void);
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extern int is_swiotlb_buffer(phys_addr_t paddr);
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#endif /* __LINUX_SWIOTLB_H */
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