[mirror_ubuntu-focal-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/bug.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;
}

static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr,
		unsigned long shift, unsigned long boundary_size)
{
	BUG_ON(!is_power_of_2(boundary_size));

	shift = (shift + index) & (boundary_size - 1);
	return shift + nr > 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
79c1879e	5	#include <linux/bug.h>
e269b085 AB	6	#include <linux/kernel.h>
e269b085 AB	7
eecfffc1 FT	8	static inline unsigned long iommu_device_max_index(unsigned long size,
	9	unsigned long offset,
	10	u64 dma_mask)
	11	{
	12	if (size + offset > dma_mask)
	13	return dma_mask - offset + 1;
	14	else
	15	return size;
	16	}
	17
79c1879e CH	18	static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr,
	19	unsigned long shift, unsigned long boundary_size)
	20	{
	21	BUG_ON(!is_power_of_2(boundary_size));
	22
	23	shift = (shift + index) & (boundary_size - 1);
	24	return shift + nr > boundary_size;
	25	}
	26
0291df8c FT	27	extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
	28	unsigned long start, unsigned int nr,
	29	unsigned long shift,
	30	unsigned long boundary_size,
	31	unsigned long align_mask);
1e19b16a	32
e269b085 AB	33	static inline unsigned long iommu_num_pages(unsigned long addr,
	34	unsigned long len,
	35	unsigned long io_page_size)
	36	{
	37	unsigned long size = (addr & (io_page_size - 1)) + len;
	38
	39	return DIV_ROUND_UP(size, io_page_size);
	40	}
56d93660	41
1e19b16a	42	#endif