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freebsd-skq/lib/libdevctl/devctl.3

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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
.\"
.\" Copyright (c) 2014 John 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.
.\"
.\" $FreeBSD$
.\"
Forgot to bump .Dd in r338233 like I promised in the review. Doh!
2018-08-23 05:08:38 +00:00
.Dd August 22, 2018
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
.Dt DEVCTL 3
.Os
.Sh NAME
.Nm devctl ,
.Nm devctl_attach ,
Implement 'devctl clear driver' to undo a previous 'devctl set driver'. 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
2016-08-29 22:48:36 +00:00
.Nm devctl_clear_driver ,
Add 'devctl delete' that calls device_delete_child(). '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
2016-04-27 16:33:17 +00:00
.Nm devctl_delete ,
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
.Nm devctl_detach ,
.Nm devctl_disable ,
.Nm devctl_enable ,
Create devctl freeze/thaw. 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
2018-08-23 05:05:47 +00:00
.Nm devctl_freeze ,
Add a new rescan method to the bus interface. 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
2016-04-27 16:29:03 +00:00
.Nm devctl_rescan ,
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
.Nm devctl_resume ,
- Note that devctl(8) will appear in 10.3 first. - Add missing devctl_set_driver entry to namelist in devlist(3). - Fix sorting of function prototypes in devlist(3). MFC after: 3 days
2016-02-02 22:55:03 +00:00
.Nm devctl_set_driver ,
Create devctl freeze/thaw. 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
2018-08-23 05:05:47 +00:00
.Nm devctl_suspend ,
.Nm devctl_thaw
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
.Nd device control library
.Sh LIBRARY
.Lb libdevctl
.Sh SYNOPSIS
.In devctl.h
.Ft int
.Fn devctl_attach "const char *device"
.Ft int
Implement 'devctl clear driver' to undo a previous 'devctl set driver'. 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
2016-08-29 22:48:36 +00:00
.Fn devctl_clear_driver "const char *device" "bool force"
.Ft int
Add 'devctl delete' that calls device_delete_child(). '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
2016-04-27 16:33:17 +00:00
.Fn devctl_delete "const char *device" "bool force"
.Ft int
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
.Fn devctl_detach "const char *device" "bool force"
.Ft int
.Fn devctl_disable "const char *device" "bool force_detach"
.Ft int
.Fn devctl_enable "const char *device"
.Ft int
Create devctl freeze/thaw. 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
2018-08-23 05:05:47 +00:00
.Fn devctl_freeze "void"
.Ft int
Add a new rescan method to the bus interface. 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
2016-04-27 16:29:03 +00:00
.Fn devctl_rescan "const char *device"
.Ft int
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
.Fn devctl_resume "const char *device"
.Ft int
.Fn devctl_set_driver "const char *device" "const char *driver" "bool force"
- Note that devctl(8) will appear in 10.3 first. - Add missing devctl_set_driver entry to namelist in devlist(3). - Fix sorting of function prototypes in devlist(3). MFC after: 3 days
2016-02-02 22:55:03 +00:00
.Ft int
.Fn devctl_suspend "const char *device"
Create devctl freeze/thaw. 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
2018-08-23 05:05:47 +00:00
.Ft int
.Fn devctl_thaw "void"
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
.Sh DESCRIPTION
The
.Nm
library adjusts the state of devices in the kernel's internal device
hierarchy.
Each control operation accepts a
.Fa device
argument that identifies the device to adjust.
The
.Fa device
may be specified as either the name of an existing device or as a
bus-specific address.
The following bus-specific address formats are currently supported:
.Bl -tag -offset indent
.It Sy pci Ns Fa domain Ns : Ns Fa bus Ns : Ns Fa slot Ns : Ns Fa function
A PCI device with the specified
.Fa domain ,
.Fa bus ,
.Fa slot ,
and
.Fa function .
.It Sy pci Ns Fa bus Ns : Ns Fa slot Ns : Ns Fa function
A PCI device in domain zero with the specified
.Fa bus ,
.Fa slot ,
and
.Fa function .
.It Fa handle
A device with an ACPI handle of
.Fa handle .
The handle must be specified as an absolute path and must begin with a
.Dq \e .
.El
.Pp
The
.Fn devctl_attach
function probes a device and attaches a suitable device driver if one is
found.
.Pp
The
.Fn devctl_detach
function detaches a device from its current device driver.
The device is left detached until either a new driver for its parent
bus is loaded or the device is explicitly probed via
.Fn devctl_attach .
If
.Fa force
is true,
the current device driver will be detached even if the device is busy.
.Pp
The
Add 'devctl delete' that calls device_delete_child(). '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
2016-04-27 16:33:17 +00:00
.Fn devctl_delete
function deletes a device from the device tree.
No
If
.Fa force
is true,
the device is deleted even if the device is physically present.
.Pp
The
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
.Fn devctl_disable
function disables 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
.Fa force_detach
is true,
the current device driver will be detached even if the device is busy.
The device will remain disabled and detached until it is explicitly enabled
via
.Fn devctl_enable .
.Pp
The
.Fn devctl_enable
function re-enables a disabled device.
The device will probe and attach if a suitable device driver is found.
.Pp
The
.Fn devctl_suspend
function suspends a device.
This may include placing the device in a reduced power state,
but any device driver currently attached to the device will remain attached.
.Pp
The
.Fn devctl_resume
function resumes a suspended device to a fully working state.
.Pp
The
.Fn devctl_set_driver
function attaches a device driver named
.Fa driver
to a device.
If the device is already attached and
.Fa force
is false,
the request will fail.
If the device is already attached and
.Fa force
is true,
the device will be detached from its current device driver before it is
attached to the new device driver.
Add a new rescan method to the bus interface. 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
2016-04-27 16:29:03 +00:00
.Pp
The
Implement 'devctl clear driver' to undo a previous 'devctl set driver'. 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
2016-08-29 22:48:36 +00:00
.Fn devctl_clear_driver
function resets a device so that it can be attached to any valid device
driver rather than only drivers with a previously specified name.
This function is used to undo a previous call to
.Fn devctl_set_driver .
If the device is already attached and
.Fa force
is false,
the request will fail.
If the device is already attached and
.Fa force
is true,
the device will be detached from its current device driver.
After the device's name is reset,
it is reprobed and attached to a suitable device driver if one is found.
.Pp
The
Add a new rescan method to the bus interface. 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
2016-04-27 16:29:03 +00:00
.Fn devctl_rescan
function rescans a bus device checking for devices that have been added or
removed.
Create devctl freeze/thaw. 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
2018-08-23 05:05:47 +00:00
.Pp
The
.Fn devctl_freeze
function freezes probe and attach processing initiated in response to
drivers being loaded.
.Pp
The
.Fn devctl_thaw
function resumes (thaws the freeze) probe and attach processing
initiated in response to drivers being loaded.
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
.Sh RETURN VALUES
Implement 'devctl clear driver' to undo a previous 'devctl set driver'. 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
2016-08-29 22:48:36 +00:00
.Rv -std devctl_attach devctl_clear_driver devctl_delete devctl_detach \
devctl_disable devctl_enable devctl_suspend devctl_rescan devctl_resume \
devctl_set_driver
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
.Sh ERRORS
In addition to specific errors noted below,
all of the
.Nm
functions may fail for any of the errors described in
.Xr open 2
as well as:
.Bl -tag -width Er
.It Bq Er EINVAL
The device name is too long.
.It Bq Er ENOENT
No existing device matches the specified name or location.
.It Bq Er EPERM
The current process is not permitted to adjust the state of
.Fa device .
.El
.Pp
The
.Fn devctl_attach
function may fail if:
.Bl -tag -width Er
.It Bq Er EBUSY
The device is already attached.
.It Bq Er ENOMEM
An internal memory allocation request failed.
.It Bq Er ENXIO
The device is disabled.
.It Bq Er ENXIO
No suitable driver for the device could be found,
or the driver failed to attach.
.El
.Pp
The
.Fn devctl_detach
function may fail if:
.Bl -tag -width Er
.It Bq Er EBUSY
The current device driver for
.Fa device
is busy and cannot detach at this time.
Note that some drivers may return this even if
.Fa force
is true.
.It Bq Er ENXIO
The device is not attached to a driver.
.It Bq Er ENXIO
The current device driver for
.Fa device
does not support detaching.
.El
.Pp
The
.Fn devctl_enable
function may fail if:
.Bl -tag -width Er
.It Bq Er EBUSY
The device is already enabled.
.It Bq Er ENOMEM
An internal memory allocation request failed.
.It Bq Er ENXIO
No suitable driver for the device could be found,
or the driver failed to attach.
.El
.Pp
The
.Fn devctl_disable
function may fail if:
.Bl -tag -width Er
.It Bq Er EBUSY
The current device driver for
.Fa device
is busy and cannot detach at this time.
Note that some drivers may return this even if
.Fa force_detach
is true.
.It Bq Er ENXIO
The device is already disabled.
.It Bq Er ENXIO
The current device driver for
.Fa device
does not support detaching.
.El
.Pp
The
.Fn devctl_suspend
function may fail if:
.Bl -tag -width Er
.It Bq Er EBUSY
The device is already suspended.
.It Bq Er EINVAL
The device to be suspended is the root bus device.
.El
.Pp
The
.Fn devctl_resume
function may fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The device is not suspended.
.It Bq Er EINVAL
The device to be resumed is the root bus device.
.El
.Pp
The
.Fn devctl_set_driver
function may fail if:
.Bl -tag -width Er
.It Bq Er EBUSY
The device is currently attached to a device driver and
.Fa force
is false.
.It Bq Er EBUSY
The current device driver for
.Fa device
is busy and cannot detach at this time.
.It Bq Er EFAULT
The
.Fa driver
argument points outside the process' allocated address space.
.It Bq Er ENOENT
No device driver with the requested name exists.
.It Bq Er ENOMEM
An internal memory allocation request failed.
.It Bq Er ENXIO
The device is disabled.
.It Bq Er ENXIO
The new device driver failed to attach.
.El
Add a new rescan method to the bus interface. 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
2016-04-27 16:29:03 +00:00
.Pp
The
Implement 'devctl clear driver' to undo a previous 'devctl set driver'. 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
2016-08-29 22:48:36 +00:00
.Fn devctl_clear_driver
function may fail if:
.Bl -tag -width Er
.It Bq Er EBUSY
The device is currently attached to a device driver and
.Fa force
is false.
.It Bq Er EBUSY
The current device driver for
.Fa device
is busy and cannot detach at this time.
.It Bq Er EINVAL
The device is not configured for a specific device driver name.
.It Bq Er ENXIO
The device driver chosen after reprobing failed to attach.
.El
.Pp
The
Add a new rescan method to the bus interface. 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
2016-04-27 16:29:03 +00:00
.Fn devctl_rescan
function may fail if:
.Bl -tag -width Er
.It Bq Er ENXIO
The device is not attached to a driver.
.It Bq Er ENXIO
The bus driver does not support rescanning.
.El
Add 'devctl delete' that calls device_delete_child(). '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
2016-04-27 16:33:17 +00:00
.Pp
The
.Fn devctl_delete
function may fail if:
.Bl -tag -width Er
.It Bq Er EBUSY
The device is physically present and
.Fa force
is false.
.It Bq Er EINVAL
.Fa dev
is the root device of the device tree.
.El
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
.Sh SEE ALSO
.Xr devinfo 3 ,
.Xr devstat 3 ,
.Xr devctl 8
.Sh HISTORY
The
.Nm
library first appeared in
- Note that devctl(8) will appear in 10.3 first. - Add missing devctl_set_driver entry to namelist in devlist(3). - Fix sorting of function prototypes in devlist(3). MFC after: 3 days
2016-02-02 22:55:03 +00:00
.Fx 10.3 .
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
.Sh BUGS
If a device is suspended individually via
.Fn devctl_suspend
and the entire machine is subsequently suspended,
the device will be resumed when the machine resumes.
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