[linux.git] / include / linux / iommu-helper.h

#ifndef _LINUX_IOMMU_HELPER_H
#define _LINUX_IOMMU_HELPER_H

#include <linux/kernel.h>

static inline unsigned long iommu_device_max_index(unsigned long size,
						   unsigned long offset,
						   u64 dma_mask)
{
	if (size + offset > dma_mask)
		return dma_mask - offset + 1;
	else
		return size;
}

extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
				  unsigned long shift,
				  unsigned long boundary_size);
extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
				      unsigned long start, unsigned int nr,
				      unsigned long shift,
				      unsigned long boundary_size,
				      unsigned long align_mask);

static inline unsigned long iommu_num_pages(unsigned long addr,
					    unsigned long len,
					    unsigned long io_page_size)
{
	unsigned long size = (addr & (io_page_size - 1)) + len;

	return DIV_ROUND_UP(size, io_page_size);
}

#endif
Commit	Line	Data
1e19b16a TG	1	#ifndef _LINUX_IOMMU_HELPER_H
	2	#define _LINUX_IOMMU_HELPER_H
	3
e269b085 AB	4	#include <linux/kernel.h>
e269b085 AB	5
eecfffc1 FT	6	static 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
3715863a FT	16	extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
	17	unsigned long shift,
	18	unsigned long boundary_size);
0291df8c FT	19	extern 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);
1e19b16a	24
e269b085 AB	25	static 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	}
56d93660	33
1e19b16a	34	#endif