LXR linux/include/linux/iommu-helper.h

   1#ifndef _LINUX_IOMMU_HELPER_H
   2#define _LINUX_IOMMU_HELPER_H
   3
   4#include <linux/kernel.h>
   5
   6static inline unsigned long iommu_device_max_index(unsigned long size,
   7                                                   unsigned long offset,
   8                                                   u64 dma_mask)
   9{
  10        if (size + offset > dma_mask)
  11                return dma_mask - offset + 1;
  12        else
  13                return size;
  14}
  15
  16extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
  17                                  unsigned long shift,
  18                                  unsigned long boundary_size);
  19extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
  20                                      unsigned long start, unsigned int nr,
  21                                      unsigned long shift,
  22                                      unsigned long boundary_size,
  23                                      unsigned long align_mask);
  24
  25static inline unsigned long iommu_num_pages(unsigned long addr,
  26                                            unsigned long len,
  27                                            unsigned long io_page_size)
  28{
  29        unsigned long size = (addr & (io_page_size - 1)) + len;
  30
  31        return DIV_ROUND_UP(size, io_page_size);
  32}
  33
  34#endif
  35