'\" t
.\"     Title: pci_request_region_exclusive
.\"    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_REQUEST_REGION_E" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Hardware Interfaces"
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.SH "NAME"
pci_request_region_exclusive \- Reserved PCI I/O and memory resource
.SH "SYNOPSIS"
.HP \w'int\ pci_request_region_exclusive('u
.BI "int pci_request_region_exclusive(struct\ pci_dev\ *\ " "pdev" ", int\ " "bar" ", const\ char\ *\ " "res_name" ");"
.SH "ARGUMENTS"
.PP
\fIpdev\fR
.RS 4
PCI device whose resources are to be reserved
.RE
.PP
\fIbar\fR
.RS 4
BAR to be reserved
.RE
.PP
\fIres_name\fR
.RS 4
Name to be associated with resource\&.
.RE
.SH "DESCRIPTION"
.PP
Mark the PCI region associated with PCI device
\fIpdev\fR
BR
\fIbar\fR
as being reserved by owner
\fIres_name\fR\&. Do not access any address inside the PCI regions unless this call returns successfully\&.
.PP
Returns 0 on success, or
\fBEBUSY\fR
on error\&. A warning message is also printed on failure\&.
.PP
The key difference that _exclusive makes it that userspace is explicitly not allowed to map the resource via /dev/mem or sysfs\&.
.SH "COPYRIGHT"
.br