drivers/iommu/dma-iommu.h

File Facts

System

Linux kernel

Corpus path

drivers/iommu/dma-iommu.h

Extension

.h

Size

1444 bytes

Lines

64

Domain

Driver Families

Bucket

drivers/iommu

Inferred role

Driver Families: implementation source

Status

source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/iommu.h

Detected Declarations

• function iommu_setup_dma_ops
• function iommu_get_dma_cookie
• function iommu_put_dma_cookie

Annotated Snippet

#ifndef __DMA_IOMMU_H
#define __DMA_IOMMU_H

#include <linux/iommu.h>

#ifdef CONFIG_IOMMU_DMA

void iommu_setup_dma_ops(struct device *dev, struct iommu_domain *domain);

int iommu_get_dma_cookie(struct iommu_domain *domain);
void iommu_put_dma_cookie(struct iommu_domain *domain);
void iommu_put_msi_cookie(struct iommu_domain *domain);

int iommu_dma_init_fq(struct iommu_domain *domain);

void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);

int iommu_dma_sw_msi(struct iommu_domain *domain, struct msi_desc *desc,
		     phys_addr_t msi_addr);

extern bool iommu_dma_forcedac;

#else /* CONFIG_IOMMU_DMA */

static inline void iommu_setup_dma_ops(struct device *dev,
				       struct iommu_domain *domain)
{
}

static inline int iommu_dma_init_fq(struct iommu_domain *domain)
{
	return -EINVAL;
}

static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
{
	return -ENODEV;
}

static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
{
}

static inline void iommu_put_msi_cookie(struct iommu_domain *domain)
{
}

static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
{
}

static inline int iommu_dma_sw_msi(struct iommu_domain *domain,
				   struct msi_desc *desc, phys_addr_t msi_addr)
{
	return -ENODEV;
}

#endif	/* CONFIG_IOMMU_DMA */
#endif	/* __DMA_IOMMU_H */

Annotation

• Immediate include surface: `linux/iommu.h`.
• Detected declarations: `function iommu_setup_dma_ops`, `function iommu_get_dma_cookie`, `function iommu_put_dma_cookie`.
• Atlas domain: Driver Families / drivers/iommu.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.