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(dma_addr_t address);
  33
  34 extern int swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size);
  35
  36 extern void
  37 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  38                         dma_addr_t *dma_handle, gfp_t flags);
  39
  40 extern void
  41 swiotlb_free_coherent(struct device *hwdev, size_t size,
  42                       void *vaddr, dma_addr_t dma_handle);
  43
  44 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  45                                    unsigned long offset, size_t size,
  46                                    enum dma_data_direction dir,
  47                                    struct dma_attrs *attrs);
  48 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  49                                size_t size, enum dma_data_direction dir,
  50                                struct dma_attrs *attrs);
  51
  52 extern int
  53 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  54                int direction);
  55
  56 extern void
  57 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  58                  int direction);
  59
  60 extern int
  61 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  62                      enum dma_data_direction dir, struct dma_attrs *attrs);
  63
  64 extern void
  65 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  66                        int nelems, enum dma_data_direction dir,
  67                        struct dma_attrs *attrs);
  68
  69 extern void
  70 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  71                             size_t size, enum dma_data_direction dir);
  72
  73 extern void
  74 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  75                         int nelems, enum dma_data_direction dir);
  76
  77 extern void
  78 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  79                                size_t size, enum dma_data_direction dir);
  80
  81 extern void
  82 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
  83                            int nelems, enum dma_data_direction dir);
  84
  85 extern void
  86 swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  87                                   unsigned long offset, size_t size,
  88                                   enum dma_data_direction dir);
  89
  90 extern void
  91 swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
  92                                      unsigned long offset, size_t size,
  93                                      enum dma_data_direction dir);
  94
  95 extern int
  96 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
  97
  98 extern int
  99 swiotlb_dma_supported(struct device *hwdev, u64 mask);
 100
 101 #endif /* __LINUX_SWIOTLB_H */