arch/um/drivers/vfio_user.h

File Facts

System

Linux kernel

Corpus path

arch/um/drivers/vfio_user.h

Extension

.h

Size

1465 bytes

Lines

45

Domain

Architecture Layer

Bucket

arch/um

Inferred role

Architecture Layer: implementation source

Status

source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• struct uml_vfio_user_device

Annotated Snippet

struct uml_vfio_user_device {
	int device;

	struct {
		uint64_t size;
		uint64_t offset;
	} *region;
	int num_regions;

	int32_t *irqfd;
	int irq_count;
};

int uml_vfio_user_open_container(void);
int uml_vfio_user_setup_iommu(int container);

int uml_vfio_user_get_group_id(const char *device);
int uml_vfio_user_open_group(int group_id);
int uml_vfio_user_set_container(int container, int group);
int uml_vfio_user_unset_container(int container, int group);

int uml_vfio_user_setup_device(struct uml_vfio_user_device *dev,
			       int group, const char *device);
void uml_vfio_user_teardown_device(struct uml_vfio_user_device *dev);

int uml_vfio_user_activate_irq(struct uml_vfio_user_device *dev, int index);
void uml_vfio_user_deactivate_irq(struct uml_vfio_user_device *dev, int index);
int uml_vfio_user_update_irqs(struct uml_vfio_user_device *dev);

int uml_vfio_user_cfgspace_read(struct uml_vfio_user_device *dev,
				unsigned int offset, void *buf, int size);
int uml_vfio_user_cfgspace_write(struct uml_vfio_user_device *dev,
				 unsigned int offset, const void *buf, int size);

int uml_vfio_user_bar_read(struct uml_vfio_user_device *dev, int bar,
			   unsigned int offset, void *buf, int size);
int uml_vfio_user_bar_write(struct uml_vfio_user_device *dev, int bar,
			    unsigned int offset, const void *buf, int size);

#endif /* __UM_VFIO_USER_H */

Annotation

• Detected declarations: `struct uml_vfio_user_device`.
• Atlas domain: Architecture Layer / arch/um.
• 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.