include/linux/iommu-helper.h

   1 #ifndef _LINUX_IOMMU_HELPER_H
   2 #define _LINUX_IOMMU_HELPER_H
   3
   4 static inline unsigned long iommu_device_max_index(unsigned long size,
   5                                                    unsigned long offset,
   6                                                    u64 dma_mask)
   7 {
   8         if (size + offset > dma_mask)
   9                 return dma_mask - offset + 1;
  10         else
  11                 return size;
  12 }
  13
  14 extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
  15                                   unsigned long shift,
  16                                   unsigned long boundary_size);
  17 extern void iommu_area_reserve(unsigned long *map, unsigned long i, int len);
  18 extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
  19                                       unsigned long start, unsigned int nr,
  20                                       unsigned long shift,
  21                                       unsigned long boundary_size,
  22                                       unsigned long align_mask);
  23 extern void iommu_area_free(unsigned long *map, unsigned long start,
  24                             unsigned int nr);
  25
  26 extern unsigned long iommu_num_pages(unsigned long addr, unsigned long len,
  27                                      unsigned long io_page_size);
  28
  29 #endif