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  * log of the size of each IO TLB slab.  The number of slabs is command line
  19  * controllable.
  20  */
  21 #define IO_TLB_SHIFT 11
  22
  23 extern void
  24 swiotlb_init(void);
  25
  26 extern void *swiotlb_alloc(unsigned order, unsigned long nslabs);
  27
  28 extern dma_addr_t swiotlb_phys_to_bus(struct device *hwdev,
  29                                       phys_addr_t address);
  30 extern phys_addr_t swiotlb_bus_to_phys(struct device *hwdev,
  31                                        dma_addr_t address);
  32
  33 extern int swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size);
  34
  35 extern void
  36 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  37                         dma_addr_t *dma_handle, gfp_t flags);
  38
  39 extern void
  40 swiotlb_free_coherent(struct device *hwdev, size_t size,
  41                       void *vaddr, dma_addr_t dma_handle);
  42
  43 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  44                                    unsigned long offset, size_t size,
  45                                    enum dma_data_direction dir,
  46                                    struct dma_attrs *attrs);
  47 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  48                                size_t size, enum dma_data_direction dir,
  49                                struct dma_attrs *attrs);
  50
  51 extern int
  52 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  53                int direction);
  54
  55 extern void
  56 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  57                  int direction);
  58
  59 extern int
  60 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  61                      enum dma_data_direction dir, struct dma_attrs *attrs);
  62
  63 extern void
  64 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  65                        int nelems, enum dma_data_direction dir,
  66                        struct dma_attrs *attrs);
  67
  68 extern void
  69 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  70                             size_t size, enum dma_data_direction dir);
  71
  72 extern void
  73 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  74                         int nelems, enum dma_data_direction dir);
  75
  76 extern void
  77 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  78                                size_t size, enum dma_data_direction dir);
  79
  80 extern void
  81 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
  82                            int nelems, enum dma_data_direction dir);
  83
  84 extern void
  85 swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  86                                   unsigned long offset, size_t size,
  87                                   enum dma_data_direction dir);
  88
  89 extern void
  90 swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
  91                                      unsigned long offset, size_t size,
  92                                      enum dma_data_direction dir);
  93
  94 extern int
  95 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
  96
  97 extern int
  98 swiotlb_dma_supported(struct device *hwdev, u64 mask);
  99
 100 #endif /* __LINUX_SWIOTLB_H */