mctp: Fix priming race condition using global barrier

Implement a global querying flag and shared barrier counter in
MctpUtil.cpp to postpone all D-Bus events during the priming scan.
This fixes a race condition where concurrent events arriving during the
multi-step priming query could cause stale endpoints or inconsistent
state.

Add Tests 4, 5, and 6 to verify that concurrent events (Add, Remove,
Remove->Add) are correctly deferred and processed after priming
completes. Add #ifdef UNIT_TEST delay in MctpUtil.cpp to simulate the
race condition.

Change-Id: I66aa19275290611ab5f485a19e0282806441d47f
Google-Bug-Id: 490106522
Signed-off-by: Hao Jiang <jianghao@google.com>
2 files changed
tree: 66340e367bfb83181bd29e04fd749a65d84a91a2
  1. gen/
  2. include/
  3. proto/
  4. service_files/
  5. src/
  6. subprojects/
  7. tests/
  8. yaml/
  9. .clang-format
  10. .clang-tidy
  11. .clang-tidy-ignore
  12. .gitignore
  13. build.md
  14. gemini.md
  15. lesson.md
  16. LICENSE
  17. meson.build
  18. meson_options.txt
  19. OWNERS
  20. README.md
README.md

dbus-sensors

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.

key features

  • 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

dbus interfaces

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.

Reactor

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.

configuration

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.

sensor documentation