d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
95a74ab4fb
freebsd-dev/share/man/man9/bus_generic_new_pass.9

58 lines
2.2 KiB
Groff
Raw Normal View History

Add support for multiple passes of the device tree during the boot-time probe. The current device order is unchanged. This commit just adds the infrastructure and ABI changes so that it is easier to merge later changes into 8.x. - Driver attachments now have an associated pass level. Attachments are not allowed to probe or attach to drivers until the system-wide pass level is >= the attachment's pass level. By default driver attachments use the "last" pass level (BUS_PASS_DEFAULT). Driver's that wish to probe during an earlier pass use EARLY_DRIVER_MODULE() instead of DRIVER_MODULE() which accepts the pass level as an additional parameter. - A new method BUS_NEW_PASS has been added to the bus interface. This method is invoked when the system-wide pass level is changed to kick off a rescan of the device tree so that drivers that have just been made "eligible" can probe and attach. - The bus_generic_new_pass() function provides a default implementation of BUS_NEW_PASS(). It first allows drivers that were just made eligible for this pass to identify new child devices. Then it propogates the rescan to child devices that already have an attached driver by invoking their BUS_NEW_PASS() method. It also reprobes devices without a driver. - BUS_PROBE_NOMATCH() is only invoked for devices that do not have an attached driver after being scanned during the final pass. - The bus_set_pass() function is used during boot to raise the pass level. Currently it is only called once during root_bus_configure() to raise the pass level to BUS_PASS_DEFAULT. This has the effect of probing all devices in a single pass identical to previous behavior. Reviewed by: imp Approved by: re (kib)
2009-06-09 14:26:23 +00:00
.\" -*- nroff -*-
.\"
Reassign copyright statements on several files from Advanced Computing Technologies LLC to Hudson River Trading LLC. Approved by: Hudson River Trading LLC (who owns ACT LLC) MFC after: 1 week
2015-04-23 14:22:20 +00:00
.\" Copyright (c) 2009 Hudson River Trading LLC
Add support for multiple passes of the device tree during the boot-time probe. The current device order is unchanged. This commit just adds the infrastructure and ABI changes so that it is easier to merge later changes into 8.x. - Driver attachments now have an associated pass level. Attachments are not allowed to probe or attach to drivers until the system-wide pass level is >= the attachment's pass level. By default driver attachments use the "last" pass level (BUS_PASS_DEFAULT). Driver's that wish to probe during an earlier pass use EARLY_DRIVER_MODULE() instead of DRIVER_MODULE() which accepts the pass level as an additional parameter. - A new method BUS_NEW_PASS has been added to the bus interface. This method is invoked when the system-wide pass level is changed to kick off a rescan of the device tree so that drivers that have just been made "eligible" can probe and attach. - The bus_generic_new_pass() function provides a default implementation of BUS_NEW_PASS(). It first allows drivers that were just made eligible for this pass to identify new child devices. Then it propogates the rescan to child devices that already have an attached driver by invoking their BUS_NEW_PASS() method. It also reprobes devices without a driver. - BUS_PROBE_NOMATCH() is only invoked for devices that do not have an attached driver after being scanned during the final pass. - The bus_set_pass() function is used during boot to raise the pass level. Currently it is only called once during root_bus_configure() to raise the pass level to BUS_PASS_DEFAULT. This has the effect of probing all devices in a single pass identical to previous behavior. Reviewed by: imp Approved by: re (kib)
2009-06-09 14:26:23 +00:00
.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
.\" All rights reserved.
.\"
.\" 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
.\"
.\" $FreeBSD$
.\"
"Buses" is the preferred plural of "bus" Replace archaic "busses" with modern form "buses." Intentionally excluded: * Old/random drivers I didn't recognize * Old hardware in general * Use of "busses" in code as identifiers No functional change. http://grammarist.com/spelling/buses-busses/ PR: 216099 Reported by: bltsrc at mail.ru Sponsored by: Dell EMC Isilon
2017-01-15 17:54:01 +00:00
.Dd January 15, 2017
mdoc nitpicking: the title argument shall be uppercase
2010-06-11 06:03:47 +00:00
.Dt BUS_GENERIC_NEW_PASS 9
Add support for multiple passes of the device tree during the boot-time probe. The current device order is unchanged. This commit just adds the infrastructure and ABI changes so that it is easier to merge later changes into 8.x. - Driver attachments now have an associated pass level. Attachments are not allowed to probe or attach to drivers until the system-wide pass level is >= the attachment's pass level. By default driver attachments use the "last" pass level (BUS_PASS_DEFAULT). Driver's that wish to probe during an earlier pass use EARLY_DRIVER_MODULE() instead of DRIVER_MODULE() which accepts the pass level as an additional parameter. - A new method BUS_NEW_PASS has been added to the bus interface. This method is invoked when the system-wide pass level is changed to kick off a rescan of the device tree so that drivers that have just been made "eligible" can probe and attach. - The bus_generic_new_pass() function provides a default implementation of BUS_NEW_PASS(). It first allows drivers that were just made eligible for this pass to identify new child devices. Then it propogates the rescan to child devices that already have an attached driver by invoking their BUS_NEW_PASS() method. It also reprobes devices without a driver. - BUS_PROBE_NOMATCH() is only invoked for devices that do not have an attached driver after being scanned during the final pass. - The bus_set_pass() function is used during boot to raise the pass level. Currently it is only called once during root_bus_configure() to raise the pass level to BUS_PASS_DEFAULT. This has the effect of probing all devices in a single pass identical to previous behavior. Reviewed by: imp Approved by: re (kib)
2009-06-09 14:26:23 +00:00
.Os
.Sh NAME
.Nm bus_generic_new_pass
.Nd "generic implementation of BUS_NEW_PASS for bus devices"
.Sh SYNOPSIS
.In sys/param.h
.In sys/bus.h
.Ft void
.Fn bus_generic_new_pass "device_t dev"
.Sh DESCRIPTION
This function provides an implementation of the
.Xr BUS_NEW_PASS 9
method which can be used by bus drivers.
It first invokes the
.Xr DEVICE_IDENTIFY 9
method for any drivers whose pass level is equal to the new pass level.
Then, for each attached child device it calls
.Xr BUS_NEW_PASS 9
"Buses" is the preferred plural of "bus" Replace archaic "busses" with modern form "buses." Intentionally excluded: * Old/random drivers I didn't recognize * Old hardware in general * Use of "busses" in code as identifiers No functional change. http://grammarist.com/spelling/buses-busses/ PR: 216099 Reported by: bltsrc at mail.ru Sponsored by: Dell EMC Isilon
2017-01-15 17:54:01 +00:00
to rescan child buses,
Add support for multiple passes of the device tree during the boot-time probe. The current device order is unchanged. This commit just adds the infrastructure and ABI changes so that it is easier to merge later changes into 8.x. - Driver attachments now have an associated pass level. Attachments are not allowed to probe or attach to drivers until the system-wide pass level is >= the attachment's pass level. By default driver attachments use the "last" pass level (BUS_PASS_DEFAULT). Driver's that wish to probe during an earlier pass use EARLY_DRIVER_MODULE() instead of DRIVER_MODULE() which accepts the pass level as an additional parameter. - A new method BUS_NEW_PASS has been added to the bus interface. This method is invoked when the system-wide pass level is changed to kick off a rescan of the device tree so that drivers that have just been made "eligible" can probe and attach. - The bus_generic_new_pass() function provides a default implementation of BUS_NEW_PASS(). It first allows drivers that were just made eligible for this pass to identify new child devices. Then it propogates the rescan to child devices that already have an attached driver by invoking their BUS_NEW_PASS() method. It also reprobes devices without a driver. - BUS_PROBE_NOMATCH() is only invoked for devices that do not have an attached driver after being scanned during the final pass. - The bus_set_pass() function is used during boot to raise the pass level. Currently it is only called once during root_bus_configure() to raise the pass level to BUS_PASS_DEFAULT. This has the effect of probing all devices in a single pass identical to previous behavior. Reviewed by: imp Approved by: re (kib)
2009-06-09 14:26:23 +00:00
and for each unattached child device it calls
.Xr device_probe_and_attach 9 .
.Sh SEE ALSO
.Xr BUS_NEW_PASS 9 ,
.Xr bus_set_pass 9 ,
.Xr device 9 ,
.Xr DEVICE_IDENTIFY 9
Reference in New Issue Copy Permalink