[mirror_ubuntu-bionic-kernel.git] / include / linux / iommu-helper.h

/* SPDX-License-Identifier: GPL-2.0 */
#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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1e19b16a TG	2	#ifndef _LINUX_IOMMU_HELPER_H
	3	#define _LINUX_IOMMU_HELPER_H
	4
e269b085 AB	5	#include <linux/kernel.h>
e269b085 AB	6
eecfffc1 FT	7	static 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
3715863a FT	17	extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
	18	unsigned long shift,
	19	unsigned long boundary_size);
0291df8c FT	20	extern 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);
1e19b16a	25
e269b085 AB	26	static 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	}
56d93660	34
1e19b16a	35	#endif