'\" t
.\"     Title: pci_msi_vec_count
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Hardware Interfaces
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "PCI_MSI_VEC_COUNT" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Hardware Interfaces"
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.SH "NAME"
pci_msi_vec_count \- Return the number of MSI vectors a device can send
.SH "SYNOPSIS"
.HP \w'int\ pci_msi_vec_count('u
.BI "int pci_msi_vec_count(struct\ pci_dev\ *\ " "dev" ");"
.SH "ARGUMENTS"
.PP
\fIdev\fR
.RS 4
device to report about
.RE
.SH "DESCRIPTION"
.PP
This function returns the number of MSI vectors a device requested via Multiple Message Capable register\&. It returns a negative errno if the device is not capable sending MSI interrupts\&. Otherwise, the call succeeds and returns a power of two, up to a maximum of 2^5 (32), according to the MSI specification\&.
.SH "COPYRIGHT"
.br