OpenBMC DBUS API

This document aims to specify the OpenBMC DBUS API.

The Phosphor distribution provides sample applications that implement off all the interfaces and objects listed below. Alternative or more feature complete applications are possible by implementing parts of this DBUS API.

OpenBMC typically adheres to DBUS best practices and usage models; however, one deviation is that OpenBMC places no requirements on well known service names. This allows developers to structure their object implementations in whatever processes they choose. In the standard DBUS programming model, applications connect to a service with a well known name. The well known name is associated with a fixed schema. In OpenBMC, without any standardization of well known names, applications lose the knowledge of what applications provide which objects. To address this, the Phosphor distribution provides the objectmapper service. See the org.openbmc.objectmapper.ObjectMapper interface below for more information.

The OpenBMC DBUS API is still alpha. If you have questions or suggestions please let the community know.

org.openbmc.HostIpmi

The HostIpmi interface allows applications to interact with host processor firmware using IPMI. Typically applications should use the higher level APIs provided by org.openbmc.HostServices to interact with the host processor firmware.

methods

name	in signature	out signature	description
sendMessage	yyyyyay	x	Send an IPMI message to the host processor firmware.
	y		IPMI seq.
	y		IPMI netfn.
	y		IPMI lun.
	y		IPMI cmd.
	y		IPMI cc.
	ay		IPMI msg.
		x	The result status.
setAttention	void	x	Raise an SMS attention event.
		x	The result status.

signals

name	signature	description
ReceivedMsg	yyyyay	An IPMI message was received from the host processor firmware.
	y	IPMI seq.
	y	IPMI netfn.
	y	IPMI lun.
	y	IPMI cmd.
	ay	IPMI message.

namespace

path	required	description
/org/openbmc/HostIpmi/<n>	Yes on systems with the host-ipmi machine feature, otherwise no.	n: IPMI interface number. If implemented, at least one IPMI interface must exist.

org.openbmc.HostServices

The HostServices interface allows applications to interact with the host processor firmware. Applications should use the high level APIs provided here in favor of org.openbmc.HostIpmi where applicable.

methods

name	in signature	out signature	description
SoftPowerOff	void	x	Prepare the host processor firmware for an orderly shutdown.
		x	The result status.

namespace

path	required	description
/org/openbmc/HostServices	Yes on systems with the host-ipmi machine feature, otherwise no.	?

org.openbmc.InventoryItem

The InventoryItem interface allows applications to examine and manipulate information that relates to inventory items.

methods

name	in signature	out signature	description
setPresent	s	void	Indicate the item is present.
	s		true or false
setFault	s	void	Indicate the item is faulted.
	s		true or false
update	a{sv}	void	Update the item attributes.
	a{sv}		Key/value pair dictionary.

properties

name	signature	description
is_fru	b	The item is field replaceable.
fru_type	s	The type of the item.
present	s	The item is physically present.
fault	s	Whether or not the item is faulted.

namespace

path	required	description
/org/openbmc/inventory/<item>	No	Inventory items must be instantiated in the inventory namespace.

org.openbmc.NetworkManager

The NetworkManager interface allows applications to examine and manipulate network settings.

methods

name	in signature	out signature	description
GetAddressType	s	s	Query the IP address type.
	s		The network device to query.
		s	The address type for the network device.
GetHwAddress	s	s	Query the hardware address.
	s		The network device to query.
		s	The hardware address for the network device.
SetAddress4	ssss	x	Set the IPV4 address.
	s		The network device on which to set the ipv4 address.
	s		The ipv4 address to set.
	s		The ipv4 mask to set.
	s		The ipv4 gateway to set
		x	The result status.
EnableDHCP	s	x	Enable DHCP.
	s		The network device on which to enable DHCP.
		x	The result status.
SetHwAddress	ss	i	Set the hardware address.
	s		The network device on which to set the hardware address.
	s		The hardware address to set.
		i	The result status.
GetAddress4	s	iyss	Query the IPV4 address.
	s		The network device to query.
		i	?
		y	?
		s	?
		s	?

namespace

path	required	description
/org/openbmc/NetworkManager/Interface	Yes on systems with the network machine feature, otherwise no.	?

org.openbmc.Sensors

The Sensors interface allows applications to register a sensor instance with a sensor management application.

methods

name	in signature	out signature	description
register	ss	void	Register a sensor instance of type class.
	s		The class name of the sensor.
	s		The object path of the sensor.
delete	s	void	Deregister a sensor instance.
	s		The object path of the sensor.

namespace

path	required	description
/org/openbmc/sensors	Yes	The sensor manager must be instantiated here.

org.openbmc.HwmonSensor

The HwmonSensor interface allows applications to query and manipulate hwmon based sensors.

methods

name	in signature	out signature	description
setByPoll	v	(bv)	?
	v		?
		(bv)	?

properties

name	signature	description
scale	?	?
offset	?	?
filename	?	?

namespace

path	required	description
/org/openbmc/sensors/<class>/<sensor>	No	Any sensor instances must be instantiated in the sensors namespace.

org.openbmc.SensorThresholds

The SensorThreshold interface allows applications to query and manipulate sensors thresholds.

methods

name	in signature	out signature	description
resetThresholdState	void	void	?

signals

name	signature	description
Emergency	void	?

properties

name	signature	description
thresholds_enabled	?	?
emergency_enabled	?	?
warning_upper	?	?
warning_lower	?	?
critical_upper	?	?
critical_lower	?	?
threshold_state	?	?
worst_threshold_state	?	?

namespace

path	required	description
/org/openbmc/sensors/<class>/<sensor>	No	Any sensor instances must be instantiated in the sensors namespace.

org.openbmc.SensorValue

The SensorValue interface allows applications to query and manipulate sensors that only provide a value.

methods

name	in signature	out signature	description
setValue	v	void	Set the sensor value.
	v		The value to set.
getValue	void	v	Get the sensor value.
		v	The sensor value.

properties

name	signature	description
units	s	The units associated with the sensor value.
error	?	?

namespace

path	required	description
/org/openbmc/sensors/<class>/<sensor>	No	Any sensor instances must be instantiated in the sensors namespace.

org.openbmc.Button

The Button interface allows applications to query the state of buttons.

methods

name	in signature	out signature	description
isOn	void	b	Query the button state.
		b	The button state.
simPress	void	void	Simulate a button press.
simLongPress	void	void	Simulate a long button press.

signals

name	signature	description
Released	void	The button was released.
Pressed	void	The button was pressed.
PressedLong	void	The button was pressed and held.

properties

name	signature	description
state	b	The current button state.

namespace

path	required	description
/org/openbmc/buttons/<button>	No	Any button instances must be instantiated in the buttons namespace.

org.openbmc.control.Bmc

The control.Bmc interface allows applications control the BMC.

methods

name	in signature	out signature	description
warmReset	void	void	Reset the BMC.

namespace

path	required	description
/org/openbmc/control/bmc<instance>	Yes	Any BMC control instances must be instantiated in the control namespace.

org.openbmc.managers.Download

The managers.Download interface allows applications to receive file download notifications.

signals

name	signature	description
DownloadComplete	ss	The file was downloaded successfully.
	s	The file path in the local filesystem.
	s	The name of the file that was requested.
DownloadError	s	An error occurred downloading the file.
	s	The name of the file that was requested.

namespace

path	required	description
/org/openbmc/managers/Download	?	?

org.openbmc.control.BmcFlash

The control.BmcFlash interface allows applications update the BMC firmware.

methods

name	in signature	out signature	description
updateViaTftp	ss	void	Perform a BMC firmware update using a TFTP server.
	s		The ipv4 address of the TFTP server hosting the firmware image file.
	s		The name of the file containing the BMC firmware image.

signals

name	signature	description
TftpDownload	ss	A request to download a file using TFTP occurred.
	s	The ipv4 address of the TFTP server hosting the firmware image file.
	s	The name of the file containing the BMC firmware image.

properties

name	signature	description
status	s	?
filename	s	The name of the file containing the BMC firmware image.
preserve_network_settings	b	Perform a factory reset.
restore_application_defaults	b	Perform a factory reset.
update_kernel_and_apps	b	Perform a factory reset.
clear_persistent_files	b	Perform a factory reset.

namespace

path	required	description
/org/openbmc/control/flash/bmc	?	?

org.openbmc.control.Chassis

The control.Chassis interface allows applications to query and manipulate the state of a Chassis.

methods

name	in signature	out signature	description
setIdentity	void	void	Turn on the identification indicator.
clearIdentity	void	void	Turn off the identification indicator.
powerOn	void	void	Power the chassis on.
powerOff	void	void	Power the chassis off immediately.
softPowerOff	void	void	Perform a graceful shutdown of the chassis.
reboot	void	void	Reboot the chassis immediately.
softReboot	void	void	Perform a graceful reboot of the chassis.

properties

name	signature	description
uuid	s	The chassis UUID.

namespace

path	required	description
/org/openbmc/control/chassis<instance>	?	Any chassis control instances must be instantiated in the control namespace.

org.openbmc.Flash

The Flash interface allows applications update the host firmware.

methods

name	in signature	out signature	description
update	s	void	Update the host firmware.
	s		The file containing the host firmware image.
error	s	void	?
	s		The error message.
done	void	void	?
init	void	void	?
updateViaTftp	ss	void	Update the host firmware using a TFTP server.
	s		The TFTP server url.
	s		The file containing the host firmware image.

signals

name	signature	description
Updated	void	?
Download	ss	?
	s	The TFTP server url.
	s	The file containing the host firmware image.

properties

name	signature	description
filename	s	?
flasher_path	s	?
flasher_name	s	?
flasher_instance	s	?
status	s	?

namespace

path	required	description
?	?	?

org.openbmc.SharedResource

Insert description of the SharedResource interface here.

methods

name	in signature	out signature	description
lock	s	void	Lock the shared resource.
	s		The shared resource name.
unlock	void	void	Unlock the shared resource.
isLocked	void	bs	Get the lock state of the resource.
		b	The lock state.
		s	The shared resource name.

properties

name	signature	description
lock	b	The lock state.
name	s	The shared resource name.

org.openbmc.control.Host

The control.Host interface allows applications to manipulate the host processor firmware.

methods

name	in signature	out signature	description
boot	void	void	Start the host processor firmware.
shutdown	void	void	Stop the host processor firmware.
reboot	void	void	Restart the host processor firmware.

signals

name	signature	description
Booted	void	The host processor firmware was started.

properties

name	signature	description
debug_mode	i	?
flash_side	s	?

namespace

path	required	description
/org/openbmc/control/host<instance>	No	Any host control instances must be instantiated in the control namespace.

org.openbmc.control.Power

Insert a description of the control.Power interface here.

methods

name	in signature	out signature	description
setPowerState	i	void	Set the power state.
	i		The state to enter.
getPowerState	void	i	Query the current power state.
		i	The current power state.

signals

name	signature	description
PowerGood	void	The power is on.
PowerLost	void	The power is off.

properties

name	signature	description
pgood	i	?
state	i	?
pgood_timeout	i	?

namespace

path	required	description
/org/openbmc/control/power<instance>	?	Any power control instances must be instantiated in the control namespace.

org.openbmc.Led

Insert a description of the Led interface here.

methods

name	in signature	out signature	description
setOn	void	void	Turn the LED on.
SetOff	void	void	Turn the LED off.
setBlinkSlow	void	void	Blink the LED slowly.
setBlinkFast	void	void	Blink the LED quickly.

properties

name	signature	description
color	i	The color of the LED.
function	s	?
state	s	The current LED state.

namespace

path	required	description
/org/openbmc/control/led/<led>	No	Any LED instances must be instantiated in the control/led namespace.

org.openbmc.objectmapper.ObjectMapper

The ObjectMapper interface enables applications to discover the DBUS unique connection name(s) for a given object path.

methods

name	in signature	out signature	description
GetObject	s	a{sas}	Determine the DBUS unique connection name(s) implementing a single object and the interfaces implemented by those services.
	s		The path of the object to query.
		a{sas}	A dictionary with DBUS unique connection names as keys, and interfaces as values.
GetAncestors	s	a{sa{sas}}	Determine the DBUS unique connection name(s) implementing any ancestor objects and the interfaces implemented by those services.
	s		The point in the namespace from which to provide results.
		a{sa{sas}}	A dictionary of dictionaries, with object paths as outer keys, DBUS unique connection names as inner keys, and implemented interfaces as values.
GetSubTree	si	a{sa{sas}}	Determine the DBUS unique connection name(s) implementing an entire subtree of objects in the DBUS namespace.
	s		The point in the namespace from which to provide results.
	i		The number of path elements to descend.
		a{sa{sas}}	A dictionary of dictionaries, with object paths as outer keys, DBUS unique connection names as inner keys, and interfaces implemented by those services as values.
GetSubTreePaths	si	as	List all known DBUS objects.
	s		The point in the namespace from which to provide results.
	i		The number of path elements to descend.
		as	An array of object paths.

namespace

path	required	description
/org/openbmc/objectmapper/objectmapper	Yes	The object mapper must be instantiated here.

org.openbmc.recordlog

Insert a description of the record log interface here.

methods

name	in signature	out signature	description
acceptHostMessage	sssay	q	Accept a message from the host processor firmware.
	s		The message content.
	s		The message severity.
	s		An association between the message and another entity.
	ay		Development data associated with the message.
		q	The created record ID.
clear	void	q	Remove all record instances.
		q	?

namespace

path	required	description
/org/openbmc/records/<class>	No	Any recordlog instances must be instantiated in the records namespace.

org.openbmc.record

Insert a description of the record interface here.

properties

name	signature	description
message	s	A free from message.
severity	s	The record severity.
reported_by	s	The originating entity of the record.
time	s	The timestamp associated with the record.
debug_data	ay	Development data associated with the record.

namespace

path	required	description
/org/openbmc/records/<class>/<record>	No	Records must be instantiated in the records namespace.

org.openbmc.Object.Delete

Applications that create objects that can be removed for any reason must implement this interface. Some common examples of this could be an event log instance or a user account instance.

methods

name	in signature	out signature	description
delete	void	void	Remove the object from the DBUS namespace.

org.openbmc.Associations

Applications wishing to create an association between two or more objects implement can this interface. Associations exist to provide a stable but extendable DBUS API.

properties

name	signature	description
associations	a(sss)	An array of forward, reverse, endpoint tuples.
	s	The type of association to create.
	s	The type of association to create for the endpoint.
	s	The object path of the endpoint.

For example, given an object /org/openbmc/events/1 that implements org.openbmc.Associations and then sets the associations property to:

"associations": [
  ["events", "frus", "/org/openbmc/piece_of_hardware"],
  ["events", "times", "/org/openbmc/timestamps/1"]
]

would result in the following associations:

/org/openbmc/events/1/frus
/org/openbmc/events/1/times
/org/openbmc/piece_of_hardware/events
/org/openbmc/timestamps/1/events

org.openbmc.Association

Applications use this interface to inject associations into the DBUS namespace.

properties

name	signature	description
endpoints	as	An array of association endpoints.

For example, given:

"/org/openbmc/events/1/frus": {
    "endpoints": [
        "/org/openbmc/hardware/cpu0",
        "/org/openbmc/hardware/cpu1",
    ]
}

Denotes the following:

/org/openbmc/events/1 => fru => /org/openbmc/hardware/cpu0
/org/openbmc/events/1 => fru => /org/openbmc/hardware/cpu1

org.openbmc.settings.Host

The settings.Host interface provides a basic settings repository for host processor firmware settings.

methods

Host settings are accessed using the standard org.freedesktop.DBus.Properties interface.

signals

Applications are notified of host setting changes using the standard org.freedesktop.DBus.ObjectManager interface.

properties

Settings are accessed using the standard org.freedesktop.DBus.Properties interface.

namespace

path	required	description
/org/openbmc/settings/host<instance>	No	Any host settings instances must be instantiated in the settings namespace.

org.openbmc.Watchdog

The Watchdog interface enables health monitoring applications to offload timer bookeeping to another application.

methods

name	in signature	out signature	description
start	void	void	Start the countdown timer.
poke	void	void	Ping the watchdog.
stop	void	void	Stop the countdown timer.
set	i	void	Set the timer interval.
	i		The timer interval.

signals

name	signature	description
WatchdogError	void	The watchdog was not pinged before the timer expired.*

namespace

path	required	description
/org/openbmc/watchdog/<watchdog>	No	Any watchdog instances must be instantiated in the watchdog namespace.