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