arch/x86/include/asm/irqdomain.h

File Facts

System

Linux kernel

Corpus path

arch/x86/include/asm/irqdomain.h

Extension

.h

Size

1834 bytes

Lines

65

Domain

Architecture Layer

Bucket

arch/x86

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/irqdomain.h
• asm/hw_irq.h

Detected Declarations

• struct device_node
• struct irq_data
• struct ioapic_domain_cfg
• enum ioapic_domain_type
• function x86_create_pci_msi_domain

Annotated Snippet

struct ioapic_domain_cfg {
	enum ioapic_domain_type		type;
	const struct irq_domain_ops	*ops;
	struct device_node		*dev;
};

extern const struct irq_domain_ops mp_ioapic_irqdomain_ops;

extern int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
			      unsigned int nr_irqs, void *arg);
extern void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq,
			      unsigned int nr_irqs);
extern int mp_irqdomain_activate(struct irq_domain *domain,
				 struct irq_data *irq_data, bool reserve);
extern void mp_irqdomain_deactivate(struct irq_domain *domain,
				    struct irq_data *irq_data);
extern int mp_irqdomain_ioapic_idx(struct irq_domain *domain);
#endif /* CONFIG_X86_IO_APIC */

#ifdef CONFIG_PCI_MSI
void x86_create_pci_msi_domain(void);
struct irq_domain *native_create_pci_msi_domain(void);
extern struct irq_domain *x86_pci_msi_default_domain;
#else
static inline void x86_create_pci_msi_domain(void) { }
#define native_create_pci_msi_domain	NULL
#define x86_pci_msi_default_domain	NULL
#endif

#endif

Annotation

• Immediate include surface: `linux/irqdomain.h`, `asm/hw_irq.h`.
• Detected declarations: `struct device_node`, `struct irq_data`, `struct ioapic_domain_cfg`, `enum ioapic_domain_type`, `function x86_create_pci_msi_domain`.
• Atlas domain: Architecture Layer / arch/x86.
• Implementation status: source implementation candidate.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.