pci_alloc_irq_vectors (9) - Linux Manuals

pci_alloc_irq_vectors: allocate multiple IRQs for a device

Command to display pci_alloc_irq_vectors manual in Linux: $ man 9 pci_alloc_irq_vectors

NAME

pci_alloc_irq_vectors - allocate multiple IRQs for a device

SYNOPSIS

int pci_alloc_irq_vectors(struct pci_dev * dev, unsigned int min_vecs, unsigned int max_vecs, unsigned int flags);

ARGUMENTS

dev

: PCI device to operate on

min_vecs

: minimum number of vectors required (must be >= 1)

max_vecs

: maximum (desired) number of vectors

flags

: flags or quirks for the allocation

DESCRIPTION

Allocate up to max_vecs interrupt vectors for dev, using MSI-X or MSI vectors if available, and fall back to a single legacy vector if neither is available. Return the number of vectors allocated, (which might be smaller than max_vecs) if successful, or a negative error code on error. If less than min_vecs interrupt vectors are available for dev the function will fail with -ENOSPC.

To get the Linux IRQ number used for a vector that can be passed to request_irq use the pci_irq_vector helper.