drivers/vfio/cdx/intr.c

File Facts

System

Linux kernel

Corpus path

drivers/vfio/cdx/intr.c

Extension

.c

Size

4810 bytes

Lines

216

Domain

Driver Families

Bucket

drivers/vfio

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/vfio.h
• linux/slab.h
• linux/types.h
• linux/eventfd.h
• linux/msi.h
• linux/interrupt.h
• linux/cdx/cdx_bus.h
• private.h

Detected Declarations

• function Copyright
• function vfio_cdx_msi_enable
• function vfio_cdx_msi_set_vector_signal
• function vfio_cdx_msi_set_block
• function vfio_cdx_msi_disable
• function vfio_cdx_set_msi_trigger
• function vfio_cdx_set_irqs_ioctl
• function vfio_cdx_irqs_cleanup

Annotated Snippet

if (flags & VFIO_IRQ_SET_DATA_NONE) {
			eventfd_signal(vdev->cdx_irqs[i].trigger);
		} else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
			u8 *bools = data;

			if (bools[i - start])
				eventfd_signal(vdev->cdx_irqs[i].trigger);
		}
	}

	return 0;
}

int vfio_cdx_set_irqs_ioctl(struct vfio_cdx_device *vdev,
			    u32 flags, unsigned int index,
			    unsigned int start, unsigned int count,
			    void *data)
{
	if (flags & VFIO_IRQ_SET_ACTION_TRIGGER)
		return vfio_cdx_set_msi_trigger(vdev, index, start,
			  count, flags, data);
	else
		return -EINVAL;
}

/* Free All IRQs for the given device */
void vfio_cdx_irqs_cleanup(struct vfio_cdx_device *vdev)
{
	vfio_cdx_set_msi_trigger(vdev, 0, 0, 0, VFIO_IRQ_SET_DATA_NONE, NULL);
}

Annotation

• Immediate include surface: `linux/vfio.h`, `linux/slab.h`, `linux/types.h`, `linux/eventfd.h`, `linux/msi.h`, `linux/interrupt.h`, `linux/cdx/cdx_bus.h`, `private.h`.
• Detected declarations: `function Copyright`, `function vfio_cdx_msi_enable`, `function vfio_cdx_msi_set_vector_signal`, `function vfio_cdx_msi_set_block`, `function vfio_cdx_msi_disable`, `function vfio_cdx_set_msi_trigger`, `function vfio_cdx_set_irqs_ioctl`, `function vfio_cdx_irqs_cleanup`.
• Atlas domain: Driver Families / drivers/vfio.
• 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.