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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_IOMMU_HELPER_H
   3#define _LINUX_IOMMU_HELPER_H
   4
   5#include <linux/kernel.h>
   6
   7static inline unsigned long iommu_device_max_index(unsigned long size,
   8                                                   unsigned long offset,
   9                                                   u64 dma_mask)
  10{
  11        if (size + offset > dma_mask)
  12                return dma_mask - offset + 1;
  13        else
  14                return size;
  15}
  16
  17extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
  18                                  unsigned long shift,
  19                                  unsigned long boundary_size);
  20extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
  21                                      unsigned long start, unsigned int nr,
  22                                      unsigned long shift,
  23                                      unsigned long boundary_size,
  24                                      unsigned long align_mask);
  25
  26static inline unsigned long iommu_num_pages(unsigned long addr,
  27                                            unsigned long len,
  28                                            unsigned long io_page_size)
  29{
  30        unsigned long size = (addr & (io_page_size - 1)) + len;
  31
  32        return DIV_ROUND_UP(size, io_page_size);
  33}
  34
  35#endif
  36