'\" t
.\"     Title: pci_alloc_irq_vectors_affinity
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: July 2017
.\"    Manual: Hardware Interfaces
.\"    Source: Kernel Hackers Manual 4.11.6
.\"  Language: English
.\"
.TH "PCI_ALLOC_IRQ_VECTOR" "9" "July 2017" "Kernel Hackers Manual 4\&.11\&" "Hardware Interfaces"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
pci_alloc_irq_vectors_affinity \- allocate multiple IRQs for a device
.SH "SYNOPSIS"
.HP \w'int\ pci_alloc_irq_vectors_affinity('u
.BI "int pci_alloc_irq_vectors_affinity(struct\ pci_dev\ *\ " "dev" ", unsigned\ int\ " "min_vecs" ", unsigned\ int\ " "max_vecs" ", unsigned\ int\ " "flags" ", const\ struct\ irq_affinity\ *\ " "affd" ");"
.SH "ARGUMENTS"
.PP
\fIstruct pci_dev * dev\fR
.RS 4
PCI device to operate on
.RE
.PP
\fIunsigned int min_vecs\fR
.RS 4
minimum number of vectors required (must be >= 1)
.RE
.PP
\fIunsigned int max_vecs\fR
.RS 4
maximum (desired) number of vectors
.RE
.PP
\fIunsigned int flags\fR
.RS 4
flags or quirks for the allocation
.RE
.PP
\fIconst struct irq_affinity * affd\fR
.RS 4
optional description of the affinity requirements
.RE
.SH "DESCRIPTION"
.PP
Allocate up to
\fImax_vecs\fR
interrupt vectors for
\fIdev\fR, 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
\fImax_vecs\fR) if successful, or a negative error code on error\&. If less than
\fImin_vecs\fR
interrupt vectors are available for
\fIdev\fR
the function will fail with \-ENOSPC\&.
.PP
To get the Linux IRQ number used for a vector that can be passed to
\fBrequest_irq\fR
use the
\fBpci_irq_vector\fR
helper\&.
.SH "COPYRIGHT"
.br