drivers/pci/irq.c

File Facts

System

Linux kernel

Corpus path

drivers/pci/irq.c

Extension

.c

Size

7759 bytes

Lines

281

Domain

Representative Device Path

Bucket

PCIe NVMe Storage Path

Inferred role

Representative Device Path: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Part of the selected hardware vertical slice: PCI discovery, driver binding, NVMe queues, block requests, DMA, interrupts, and completion.

• Part of the selected hardware vertical slice: PCI discovery, driver binding, NVMe queues, block requests, DMA, interrupts, and completion.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• 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/device.h
• linux/kernel.h
• linux/errno.h
• linux/export.h
• linux/interrupt.h
• linux/pci.h
• pci.h

Detected Declarations

• function Copyright
• function pci_free_irq
• function pci_swizzle_interrupt_pin
• function pci_get_interrupt_pin
• function pci_common_swizzle
• function pci_assign_irq
• function pci_check_and_set_intx_mask
• function interrupt
• function pci_check_and_mask_intx
• function pci_check_and_unmask_intx
• function pcibios_penalize_isa_irq
• function pcibios_free_irq
• export pci_request_irq
• export pci_free_irq
• export pci_common_swizzle
• export pci_check_and_mask_intx
• export pci_check_and_unmask_intx

Annotated Snippet

void __weak pcibios_penalize_isa_irq(int irq, int active) {}

int __weak pcibios_alloc_irq(struct pci_dev *dev)
{
	return 0;
}

void __weak pcibios_free_irq(struct pci_dev *dev)
{
}

Annotation

• Immediate include surface: `linux/device.h`, `linux/kernel.h`, `linux/errno.h`, `linux/export.h`, `linux/interrupt.h`, `linux/pci.h`, `pci.h`.
• Detected declarations: `function Copyright`, `function pci_free_irq`, `function pci_swizzle_interrupt_pin`, `function pci_get_interrupt_pin`, `function pci_common_swizzle`, `function pci_assign_irq`, `function pci_check_and_set_intx_mask`, `function interrupt`, `function pci_check_and_mask_intx`, `function pci_check_and_unmask_intx`.
• Atlas domain: Representative Device Path / PCIe NVMe Storage Path.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• 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.