include/linux/iommu-helper.h

Source file repositories/reference/linux-study-clean/include/linux/iommu-helper.h

File Facts

System
Linux kernel
Corpus path
include/linux/iommu-helper.h
Extension
.h
Size
1146 bytes
Lines
45
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _LINUX_IOMMU_HELPER_H
#define _LINUX_IOMMU_HELPER_H

#include <linux/bug.h>
#include <linux/log2.h>
#include <linux/math.h>
#include <linux/types.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

Annotation

Implementation Notes