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 extern int swiotlb_force;
  11
  12 /*
  13  * Maximum allowable number of contiguous slabs to map,
  14  * must be a power of 2.  What is the appropriate value ?
  15  * The complexity of {map,unmap}_single is linearly dependent on this value.
  16  */
  17 #define IO_TLB_SEGSIZE  128
  18
  19 /*
  20  * log of the size of each IO TLB slab.  The number of slabs is command line
  21  * controllable.
  22  */
  23 #define IO_TLB_SHIFT 11
  24
  25 extern void swiotlb_init(int verbose);
  26
  27 extern void
  28 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  29                         dma_addr_t *dma_handle, gfp_t flags);
  30
  31 extern void
  32 swiotlb_free_coherent(struct device *hwdev, size_t size,
  33                       void *vaddr, dma_addr_t dma_handle);
  34
  35 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  36                                    unsigned long offset, size_t size,
  37                                    enum dma_data_direction dir,
  38                                    struct dma_attrs *attrs);
  39 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  40                                size_t size, enum dma_data_direction dir,
  41                                struct dma_attrs *attrs);
  42
  43 extern int
  44 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  45                int direction);
  46
  47 extern void
  48 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  49                  int direction);
  50
  51 extern int
  52 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  53                      enum dma_data_direction dir, struct dma_attrs *attrs);
  54
  55 extern void
  56 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  57                        int nelems, enum dma_data_direction dir,
  58                        struct dma_attrs *attrs);
  59
  60 extern void
  61 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  62                             size_t size, enum dma_data_direction dir);
  63
  64 extern void
  65 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  66                         int nelems, enum dma_data_direction dir);
  67
  68 extern void
  69 swiotlb_sync_single_for_device(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_device(struct device *hwdev, struct scatterlist *sg,
  74                            int nelems, enum dma_data_direction dir);
  75
  76 extern int
  77 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
  78
  79 extern int
  80 swiotlb_dma_supported(struct device *hwdev, u64 mask);
  81
  82 #ifdef CONFIG_SWIOTLB
  83 extern void __init swiotlb_free(void);
  84 #else
  85 static inline void swiotlb_free(void) { }
  86 #endif
  87
  88 extern void swiotlb_print_info(void);
  89 #endif /* __LINUX_SWIOTLB_H */