include/linux/swiotlb.h

   1 #ifndef __LINUX_SWIOTLB_H
   2 #define __LINUX_SWIOTLB_H
   3
   4 #include <linux/types.h>
   5
   6 struct device;
   7 struct dma_attrs;
   8 struct scatterlist;
   9
  10 /*
  11  * Maximum allowable number of contiguous slabs to map,
  12  * must be a power of 2.  What is the appropriate value ?
  13  * The complexity of {map,unmap}_single is linearly dependent on this value.
  14  */
  15 #define IO_TLB_SEGSIZE  128
  16
  17
  18 /*
  19  * log of the size of each IO TLB slab.  The number of slabs is command line
  20  * controllable.
  21  */
  22 #define IO_TLB_SHIFT 11
  23
  24 extern void
  25 swiotlb_init(void);
  26
  27 extern void *swiotlb_alloc_boot(size_t bytes, unsigned long nslabs);
  28 extern void *swiotlb_alloc(unsigned order, unsigned long nslabs);
  29
  30 extern dma_addr_t swiotlb_phys_to_bus(struct device *hwdev,
  31                                       phys_addr_t address);
  32 extern phys_addr_t swiotlb_bus_to_phys(struct device *hwdev,
  33                                        dma_addr_t address);
  34
  35 extern int swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size);
  36
  37 extern void
  38 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  39                         dma_addr_t *dma_handle, gfp_t flags);
  40
  41 extern void
  42 swiotlb_free_coherent(struct device *hwdev, size_t size,
  43                       void *vaddr, dma_addr_t dma_handle);
  44
  45 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  46                                    unsigned long offset, size_t size,
  47                                    enum dma_data_direction dir,
  48                                    struct dma_attrs *attrs);
  49 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  50                                size_t size, enum dma_data_direction dir,
  51                                struct dma_attrs *attrs);
  52
  53 extern int
  54 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  55                int direction);
  56
  57 extern void
  58 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  59                  int direction);
  60
  61 extern int
  62 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  63                      enum dma_data_direction dir, struct dma_attrs *attrs);
  64
  65 extern void
  66 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  67                        int nelems, enum dma_data_direction dir,
  68                        struct dma_attrs *attrs);
  69
  70 extern void
  71 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  72                             size_t size, enum dma_data_direction dir);
  73
  74 extern void
  75 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  76                         int nelems, enum dma_data_direction dir);
  77
  78 extern void
  79 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  80                                size_t size, enum dma_data_direction dir);
  81
  82 extern void
  83 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
  84                            int nelems, enum dma_data_direction dir);
  85
  86 extern void
  87 swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  88                                   unsigned long offset, size_t size,
  89                                   enum dma_data_direction dir);
  90
  91 extern void
  92 swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
  93                                      unsigned long offset, size_t size,
  94                                      enum dma_data_direction dir);
  95
  96 extern int
  97 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
  98
  99 extern int
 100 swiotlb_dma_supported(struct device *hwdev, u64 mask);
 101
 102 #endif /* __LINUX_SWIOTLB_H */