mctp: fix E-M configuration reading for nvmed and mctpreactor Fixed a mismatch in how Entity Manager configurations are read for MCTP devices in both nvmesensor and mctpreactor. The previous implementation failed to handle different schema structures (e.g., nested BusInfo vs flat properties directly on the interface). To resolve this, the bus information extraction was refactored: - Added AbstractBusInfo and MctpReactorBusInfo in MctpUtil to target mctpreactor expectations (USB/I2C/I3C). - Created a dedicated extractNVMeBusInfo in NVMeSensorMain.cpp to handle the nested NVME1000.BusInfo0 structure. This ensures both applications can correctly parse their respective configurations from Entity Manager. Tests and mock server were updated to reflect these changes. Tested: All tests passed in Docker container. Change-Id: I28d5b196c5316974d689689304f52148d4617099 Google-Bug-Id: 490106522 Signed-off-by: Hao Jiang <jianghao@google.com>
dbus-sensors is a collection of sensor applications that provide the xyz.openbmc_project.Sensor collection of interfaces. They read sensor values from hwmon, d-bus, or direct driver access to provide readings. Some advance non-sensor features such as fan presence, pwm control, and automatic cpu detection (x86) are also supported.
runtime re-configurable from d-bus (entity-manager or the like)
isolated: each sensor type is isolated into its own daemon, so a bug in one sensor is unlikely to affect another, and single sensor modifications are possible
async single-threaded: uses sdbusplus/asio bindings
multiple data inputs: hwmon, d-bus, direct driver access
A typical dbus-sensors object support the following dbus interfaces:
Path /xyz/openbmc_project/sensors/<type>/<sensor_name>
Interfaces xyz.openbmc_project.Sensor.Value
xyz.openbmc_project.Sensor.Threshold.Critical
xyz.openbmc_project.Sensor.Threshold.Warning
xyz.openbmc_project.State.Decorator.Availability
xyz.openbmc_project.State.Decorator.OperationalStatus
xyz.openbmc_project.Association.Definitions
Sensor interfaces collection are described here.
Consumer examples of these interfaces are Redfish, Phosphor-Pid-Control, IPMI SDR.
dbus-sensor daemons are reactors that dynamically create and update sensors configuration when system configuration gets updated.
Using asio timers and async calls, dbus-sensor daemons read sensor values and check thresholds periodically. PropertiesChanged signals will be broadcasted for other services to consume when value or threshold status change. OperationStatus is set to false if the sensor is determined to be faulty.
A simple sensor example can be found here.
Sensor devices are described using Exposes records in configuration file. Name and Type fields are required. Different sensor types have different fields. Refer to entity manager schema for complete list.