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+
+# Power Supply Monitoring Application
+
+Author:
+  Brandon Wyman !bjwyman
+
+Primary assignee:
+  Brandon Wyman
+
+Other contributors:
+  Derek Howard
+
+Created:
+  2019-06-17
+
+## Problem Description
+This is a proposal to provide a set of enhancements to the current OpenBMC
+power supply application for enterprise class systems. Some enterprise class
+systems may consist of a number of configuration variations including different
+power supply types and numbers. An application capable of communicating with the
+different power supplies is needed in order to initialize the power supplies,
+validate configurations, report invalid configurations, detect and report
+various faults, and report vital product data (VPD). Some of the function will
+be configurable to be included or excluded for use on different platforms.
+
+## Background and References
+The OpenBMC project currently has a [witherspoon-pfault-analysis][1] repository
+that contains a power supply monitor application and a power sequencer monitor
+application. The current power supply application is lacking things desired for
+an enterprise class server.
+
+The intent of this new application design is to enhance the OpenBMC project
+with a single power supply application that can communicate with one or more
+[PMBus][2] power supplies and provide the enterprise features currently lacking
+in the existing application that has multiple instances talking to a single
+power supply.
+
+## Requirements
+
+Some of these requirements may be deemed as business specific logic, and thus
+could be configurable options as appropriate.
+
+1. The power supply application must detect, isolate, and report individual
+input power and power FRU faults, during boot and at runtime only.
+2. The power supply application must determine power supply presence,
+configuration, and status, and report via external interfaces.
+3. The power supply application must report power supply failures to IPMI and
+Redfish requests (during boot and at runtime only).
+4. The power supply application must report power supply present/missing changes
+and status to IPMI and Redfish requests, and to the hypervisor. Recipes and code
+for presence state monitoring and event log creation may need to be moved from
+the `phosphor-dbus-monitor` to this application, depending on if such function
+was already written or ported forward from a previously similar system.
+5. The power supply application must ensure proper power supply configuration
+and report improper configurations (during boot and at runtime only).
+6. The power supply application must collect and report power supply VPD (unless
+that VPD is collected and reported via another application reading an EEPROM
+device).
+7. The power supply application must allow power supply hot-plug and concurrent
+maintenance (CM).
+8. The power supply application should create and update average and maximum
+power consumption metric interfaces for telemetry data.
+9. The power supply application must be able to detect how many power supplies 
+are present in the system, what type of power supply is present (maximum output
+power such as 900W, 1400W, 2200W, etc.), and what type of input power is being
+supplied (AC input, DC input, input voltage, etc.).
+10. The application must be able to recognize if the power supplies present
+consist of a valid configuration. Certain invalid combinations may result in the
+application updating properties for a Minimum Ship Level ([MSL][3]) check.
+11. The application must create error logs for invalid configurations, or for 
+power supplies experiencing some other faulted condition (no input power, output
+over voltage, output over current, etc.).
+12. The application would periodically communicate with the power supplies via 
+the sysfs file system files updated via a PMBus device driver (currently only 
+known to be created and updated by the [ibm-cffps][4] device driver). Certain 
+device driver updates may be necessary to support some power supplies or power
+supply features. Any power supply that communicates using the PMBus 
+specification should be able to be supported, some manufacturing specific code
+paths may be required for commands in the "User Data and Configuration" 
+(USER_DATA_00 through USER_DATA_15) and the "Manufacturer Specific Commands"
+(MFR_SPECIFIC_00 through MFR_SPECIFIC_45), as well as bit definitions for
+STATUS_MFR_SPECIFIC and any other "MFR" command.
+
+## Proposed Design
+The proposal is to create a single new power supply application in some new
+OpenBMC repository, such as `phosphor-power-monitor`. The application would be
+written in C++17.
+
+Upon startup, the power supply application would be passed a parameter
+consisting of the location of some kind of configuration file, some JSON format
+file. This file would contain information such as the D-Bus object name(s), 
+possible power supply types, possible system types that the various power
+supplies are valid to be used in, I2C/PMBus file location data, read retries,
+deglitch counts, etc.
+
+The power supply application would then detect which system type it is running
+on, which supplies are present, if the power supply is ready for reading VPD
+information, what type each supply is, etc. The application would then try to
+find a matching valid configuration. If no match is found, that configuration
+would be considered invalid. The application should continue to check what if
+any faults are occurring, logging errors as appropriate.
+
+When the system is powered on, the power supplies should start outputting power
+to the system. At that point the application will start to and continue to
+monitor the supplies and communicate any changes such as removal of input
+voltage, removal of a power supply, insertion of a power supply, and take any
+necessary actions to take upon detection of fault conditions.
+
+The proposed power supply application would not control any fans internal to the
+power supply, that function would be left to other userspace application(s).
+
+## Alternatives Considered
+The current implementation of multiple instances of a power supply monitor was
+considered, essentially similar to the [psu-monitor][5] from the
+[witherspoon-pfault-analysis][1] repository. This design was avoided due to:
+ - Complexity of the various valid and invalid configuration combinations.
+ - Power line disturbance communication.
+ - Timing/serialization concerns with power supply communication.
+
+## Impacts
+The application is expected to have some impact on the PLDM API, due to the
+various DBus properties it may be updating.
+
+No security impacts are anticipated.
+
+The main documentation impact should be this design document. Future
+enhancements or clarifications may be required for this document.
+
+The application is expected to have a similar or lesser performance impact than
+the one application per power supply.
+
+## Testing
+Testing can be accomplished via automated or manual testing to verify that:
+* Configuration not listed as valid results in appropriate behavior.
+* Application detects and logs faults for power supply faults including input
+faults, output faults, shorts, current share faults, communication failures,
+etc.
+* Power supply VPD data reported for present power supplies.
+* Power supply removal and insertion, on a system supporting concurrent
+maintenance, does not result in power loss to powered on system.
+* System operates through power supply faults and power line disturbances as
+appropriate.
+
+CI testing could be impacted if a system being used for testing is in an
+unsupported or faulted configuration.
+
+[1]: https://github.com/openbmc/witherspoon-pfault-analysis
+[2]: https://en.wikipedia.org/wiki/Power_Management_Bus
+[3]: https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/xyz/openbmc_project/Control/README.msl.md
+[4]: https://github.com/openbmc/linux/blob/dev-5.1/drivers/hwmon/pmbus/ibm-cffps.c
+[5]: https://github.com/openbmc/witherspoon-pfault-analysis/tree/master/power-supply