src/usr.sbin/devctl, branch releng/12.2

MFC r345966, r345968:

2019-04-19T12:54:05+00:00

Implement devctl(8) command 'reset', using DEV_RESET /dev/devctl2 ioctl.

Create devctl freeze/thaw.

2018-08-23T05:05:47+00:00

This adds it to devctl, libdevctl, defines the two IOCTLs and
implements the kernel bits. causes any new drivers that are added via
kldload to be deferred until a 'thaw' comes in. These do not stack: it
is an error to freeze while frozen, or thaw while thawed.

Differential Revision: https://reviews.freebsd.org/D16735

DIRDEPS_BUILD: Update dependencies.

2017-10-31T00:07:04+00:00

Sponsored by:	Dell EMC Isilon

o Missed flag restored.

2017-05-19T20:02:32+00:00

PR:		219395
Submitted by:	Tiwei Bie

Implement 'devctl clear driver' to undo a previous 'devctl set driver'.

2016-08-29T22:48:36+00:00

Add a new 'clear driver' command for devctl along with the accompanying
ioctl and devctl_clear_driver() library routine to reset a device to
use a wildcard devclass instead of a fixed devclass.  This can be used
to undo a previous 'set driver' command.  After the device's name has
been reset to permit wildcard names, it is reprobed so that it can
attach to newly-available (to it) device drivers.

MFC after:	1 month
Sponsored by:	Chelsio Communications

Add 'devctl delete' that calls device_delete_child().

2016-04-27T16:33:17+00:00

'devctl delete' can be used to delete a device that is no longer present.
As an anti-foot-shooting measure, 'delete' will not delete a device
unless it's parent bus says it is no longer present.  This can be
overridden by passing the force ('-f') flag.

Note that this command should be used with care.  If a device is deleted
that is actually present it can't be resurrected unless the parent bus
device's driver supports rescans.

Differential Revision:	https://reviews.freebsd.org/D6019

Add a new rescan method to the bus interface.

2016-04-27T16:29:03+00:00

The BUS_RESCAN() method rescans a single bus device checking for devices
that have been added or removed from the bus.  A new 'rescan' command is
added to devctl(8) to trigger a rescan.

Differential Revision:	https://reviews.freebsd.org/D6016

- Note that devctl(8) will appear in 10.3 first.

2016-02-02T22:55:03+00:00

- Add missing devctl_set_driver entry to namelist in devlist(3).
- Fix sorting of function prototypes in devlist(3).

MFC after:	3 days

META MODE: Update dependencies with 'the-lot' and add missing directories.

2015-12-01T05:23:19+00:00

This is not properly respecting WITHOUT or ARCH dependencies in target/.
Doing so requires a massive effort to rework targets/ to do so.  A
better approach will be to either include the SUBDIR Makefiles directly
and map to DIRDEPS or just dynamically lookup the SUBDIR.  These lose
the benefit of having a userland/lib, userland/libexec, etc, though and
results in a massive package.  The current implementation of targets/ is
very unmaintainable.

Currently rescue/rescue and sys/modules are still not connected.

Sponsored by:	EMC / Isilon Storage Division

Fix formatting.

2015-07-16T05:14:20+00:00