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.\"
.\" Copyright (c) 2017 Netflix, Inc.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd October 12, 2020
.Dt DEVMATCH 8
.Os
.Sh NAME
.Nm devmatch
.Nd print information about unattached devices
.Sh SYNOPSIS
.Nm
.Op Fl adhpuv
.Op Fl -all
.Op Fl -dump
.Op Fl -hints Ar file
.Op Fl -nomatch Ar event
.Op Fl -unbound
.Op Fl -verbose
.Sh DESCRIPTION
The
.Nm
utility, without any arguments, prints all the kernel modules it has
found for all the unattached, enabled devices in the system.
.Bl -tag -width 20m
.It Fl a Fl -all
Include all devices, not just the ones that are unattached.
.It Fl d Fl -dump
Produce a human readable dump of the
.Pa linker.hints
file.
.It Fl h Fl -hints Ar file
Use the named
.Ar file
instead of
.Pa linker.hints
guessed from the current module load path.
.It Fl p Fl -nomatch Ar event
Parse and use a standard NOMATCH event from
.Xr devd 8
for matching instead of searching the device tree.
.It Fl u Fl -unbound
Attempt to produce a list of those drivers with PNP info whose driver
tables with that PNP info can not be found.
.It Fl v Fl -verbose
Produce more verbose output.
.El
.Sh SEE ALSO
.Xr devinfo 8 ,
.Xr MODULE_PNP_INFO 9
.Sh HISTORY
.Nm
first appeared in
.Fx 12.0 .
.Sh AUTHORS
.An Warner Losh Aq Mt imp@FreeBSD.org
.Sh BUGS
The kernel has hints in it, but we exclude it from the list of modules
to suggest for unmatched devices.
We exclude it when suggesting drivers, but include it when looking for
unbound devices or producing a full dump of
.Pa linker.hints .
This can be confusing.
.Pp
Some modules are hard links in
.Pa /boot/kernel
and will be reported twice.
.Pp
The PNP string's attributes are evaluated once per PNP entry on that
bus rather than once.
.Pp
The term PNP is overloaded in FreeBSD.
It means, generically, the identifying data the bus provides about a
device.
While this include old ISA PNP identifiers, it also includes the
logical equivalent in USB, PCI, and others.
.Pp
Many drivers currently lack proper PNP table decorations and need to
be updated.