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freebsd/usr.sbin/devctl/devctl.8
John Baldwin 64de80195b Add a new device control utility for new-bus devices called devctl. This
allows the user to request administrative changes to individual devices
such as attach or detaching drivers or disabling and re-enabling devices.
- Add a new /dev/devctl2 character device which uses ioctls for device
  requests.  The ioctls use a common 'struct devreq' which is somewhat
  similar to 'struct ifreq'.
- The ioctls identify the device to operate on via a string.  This
  string can either by the device's name, or it can be a bus-specific
  address.  (For unattached devices, a bus address is the only way to
  locate a device.)  Bus drivers register an eventhandler to claim
  unrecognized device names that the driver recognizes as a valid address.
  Two buses currently support addresses: ACPI recognizes any device
  in the ACPI namespace via its full path starting with "\" and
  the PCI bus driver recognizes an address specification of
  'pci[<domain>:]<bus>:<slot>:<func>' (identical to the PCI selector
  strings supported by pciconf).
- To make it easier to cut and paste, change the PnP location string
  in the PCI bus driver to output a full PCI selector string rather
  than 'slot=<slot> function=<func>'.
- Add a devctl(3) interface in libdevctl which provides a wrapper around
  the ioctls and is the preferred interface for other userland code.
- Add a devctl(8) program which is a simple wrapper around the requests
  supported by devctl(3).
- Add a device_is_suspended() function to check DF_SUSPENDED.
- Add a resource_unset_value() function that can be used to remove a
  hint from the kernel environment.  This is used to clear a
  hint.<driver>.<unit>.disabled hint when re-enabling a boot-time
  disabled device.

Reviewed by:	imp (parts)
Requested by:	imp (changing PCI location string)
Relnotes:	yes
2015-02-06 16:09:01 +00:00

138 lines
3.7 KiB
Groff

.\"
.\" Copyright (c) 2015 John Baldwin <jhb@FreeBSD.org>
.\" All rights reserved.
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.\" modification, are permitted provided that the following conditions
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" $FreeBSD$
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.Dd February 5, 2015
.Dt DEVCTL 8
.Os
.Sh NAME
.Nm devctl
.Nd device control utility
.Sh SYNOPSIS
.Nm
.Cm attach
.Ar device
.Nm
.Cm detach
.Op Fl f
.Ar device
.Nm
.Cm disable
.Op Fl f
.Ar device
.Nm
.Cm enable
.Ar device
.Nm
.Cm suspend
.Ar device
.Nm
.Cm resume
.Ar device
.Nm
.Cm set driver
.Op Fl f
.Ar device driver
.Sh DESCRIPTION
The
.Nm
utility adjusts the state of individual devices in the kernel's
internal device hierarchy.
Each invocation of
.Nm
consists of a single command followed by command-specific arguments.
Each command operates on a single device specified via the
.Ar device
argument.
The
.Ar device
may be specified either as the name of an existing device or as a
bus-specific address.
More details on supported address formats can be found in
.Xr devctl 3 .
.Pp
The following commands are supported:
.Bl -tag -width indent
.It Cm attach Ar device
Force the kernel to re-probe the device.
If a suitable driver is found,
it is attached to the device.
.It Xo Cm detach
.Op Fl f
.Ar device
.Xc
Detach the device from its current device driver.
If the
.Fl f
flag is specified,
the device driver will be detached even if the device is busy.
.It Xo Cm disable
.Op Fl f
.Ar device
.Xc
Disable a device.
If the device is currently attached to a device driver,
the device driver will be detached from the device,
but the device will retain its current name.
If the
.Fl f
flag is specified,
the device driver will be detached even if the device is busy.
.It Cm enable Ar device
Enable a device.
The device will probe and attach if a suitable device driver is found.
Note that this can re-enable a device disabled at boot time via a
loader tunable.
.It Cm suspend Ar device
Suspend a device.
This may include placing the device in a reduced power state.
.It Cm resume device
Resume a suspended device to a fully working state.
.It Xo Cm set driver
.Op Fl f
.Ar device driver
.Xc
Force the device to use a device driver named
.Ar driver .
If the device is already attached to a device driver and the
.Fl f
flag is specified,
the device will be detached from its current device driver before it is
attached to the new device driver.
If the device is already attached to a device driver and the
.Fl f
flag is not specified,
the device will not be changed.
.El
.Sh SEE ALSO
.Xr devctl 3 ,
.Xr devinfo 8
.Sh HISTORY
The
.Nm
utility first appeared in
.Fx 11.0 .