phosphor-regulators/src/manager.cpp - openbmc/phosphor-power - Gitiles

 /**
  * Copyright © 2020 IBM Corporation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "manager.hpp"

 #include "chassis.hpp"
 #include "config_file_parser.hpp"
 #include "exception_utils.hpp"
 #include "rule.hpp"
 #include "utility.hpp"

 #include <xyz/openbmc_project/Common/error.hpp>
 #include <xyz/openbmc_project/State/Chassis/server.hpp>

 #include <algorithm>
 #include <chrono>
 #include <exception>
 #include <functional>
 #include <map>
 #include <thread>
 #include <tuple>
 #include <utility>
 #include <variant>

 namespace phosphor::power::regulators
 {

 namespace fs = std::filesystem;

 constexpr auto busName = "xyz.openbmc_project.Power.Regulators";
 constexpr auto managerObjPath = "/xyz/openbmc_project/power/regulators/manager";
 constexpr auto compatibleIntf =
     "xyz.openbmc_project.Configuration.IBMCompatibleSystem";
 constexpr auto compatibleNamesProp = "Names";
 constexpr auto chassisStatePath = "/xyz/openbmc_project/state/chassis0";
 constexpr auto chassisStateIntf = "xyz.openbmc_project.State.Chassis";
 constexpr auto chassisStateProp = "CurrentPowerState";
 constexpr std::chrono::minutes maxTimeToWaitForCompatTypes{5};

 using PowerState =
     sdbusplus::xyz::openbmc_project::State::server::Chassis::PowerState;

 /**
  * Default configuration file name.  This is used when the system does not
  * implement the D-Bus compatible interface.
  */
 constexpr auto defaultConfigFileName = "config.json";

 /**
  * Standard configuration file directory.  This directory is part of the
  * firmware install image.  It contains the standard version of the config file.
  */
 const fs::path standardConfigFileDir{"/usr/share/phosphor-regulators"};

 /**
  * Test configuration file directory.  This directory can contain a test version
  * of the config file.  The test version will override the standard version.
  */
 const fs::path testConfigFileDir{"/etc/phosphor-regulators"};

 Manager::Manager(sdbusplus::bus::bus& bus, const sdeventplus::Event& event) :
     ManagerObject{bus, managerObjPath, true}, bus{bus}, eventLoop{event},
     services{bus}, timer{event, std::bind(&Manager::timerExpired, this)}
 {
     // Subscribe to D-Bus interfacesAdded signal from Entity Manager.  This
     // notifies us if the compatible interface becomes available later.
     std::string matchStr = sdbusplus::bus::match::rules::interfacesAdded() +
                            sdbusplus::bus::match::rules::sender(
                                "xyz.openbmc_project.EntityManager");
     std::unique_ptr<sdbusplus::server::match::match> matchPtr =
         std::make_unique<sdbusplus::server::match::match>(
             bus, matchStr,
             std::bind(&Manager::interfacesAddedHandler, this,
                       std::placeholders::_1));
     signals.emplace_back(std::move(matchPtr));

     // Try to find compatible system types using D-Bus compatible interface.
     // Note that it might not be supported on this system, or the service that
     // provides the interface might not be running yet.
     findCompatibleSystemTypes();

     // Try to find and load the JSON configuration file
     loadConfigFile();

     // Obtain D-Bus service name
     bus.request_name(busName);

     // If system is already powered on, enable monitoring
     if (isSystemPoweredOn())
     {
         monitor(true);
     }
 }

 void Manager::configure()
 {
     // Clear any cached data or error history related to hardware devices
     clearHardwareData();

     // Wait until the config file has been loaded or hit max wait time
     waitUntilConfigFileLoaded();

     // Verify config file has been loaded and System object is valid
     if (isConfigFileLoaded())
     {
         // Configure the regulator devices in the system
         system->configure(services);
     }
     else
     {
         // Write error message to journal
         services.getJournal().logError("Unable to configure regulator devices: "
                                        "Configuration file not loaded");

         // Log critical error since regulators could not be configured.  Could
         // cause hardware damage if default regulator settings are very wrong.
         services.getErrorLogging().logConfigFileError(Entry::Level::Critical,
                                                       services.getJournal());

         // Throw InternalFailure to propogate error status to D-Bus client
         throw sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure{};
     }
 }

 void Manager::interfacesAddedHandler(sdbusplus::message::message& msg)
 {
     // Verify message is valid
     if (!msg)
     {
         return;
     }

     try
     {
         // Read object path for object that was created or had interface added
         sdbusplus::message::object_path objPath;
         msg.read(objPath);

         // Read the dictionary whose keys are interface names and whose values
         // are dictionaries containing the interface property names and values
         std::map<std::string,
                  std::map<std::string, std::variant<std::vector<std::string>>>>
             intfProp;
         msg.read(intfProp);

         // Find the compatible interface, if present
         auto itIntf = intfProp.find(compatibleIntf);
         if (itIntf != intfProp.cend())
         {
             // Find the Names property of the compatible interface, if present
             auto itProp = itIntf->second.find(compatibleNamesProp);
             if (itProp != itIntf->second.cend())
             {
                 // Get value of Names property
                 auto propValue = std::get<0>(itProp->second);
                 if (!propValue.empty())
                 {
                     // Store list of compatible system types
                     compatibleSystemTypes = propValue;

                     // Find and load JSON config file based on system types
                     loadConfigFile();
                 }
             }
         }
     }
     catch (const std::exception&)
     {
         // Error trying to read interfacesAdded message.  One possible cause
         // could be a property whose value is not a std::vector<std::string>.
     }
 }

 void Manager::monitor(bool enable)
 {
     // Check whether already in the requested monitoring state
     if (enable == isMonitoringEnabled)
     {
         return;
     }

     isMonitoringEnabled = enable;
     if (isMonitoringEnabled)
     {
         services.getJournal().logDebug("Monitoring enabled");

         // Restart timer to have a repeating 1 second interval
         timer.restart(std::chrono::seconds(1));

         // Enable sensors service; put all sensors in an active state
         services.getSensors().enable();
     }
     else
     {
         services.getJournal().logDebug("Monitoring disabled");

         // Disable timer
         timer.setEnabled(false);

         // Disable sensors service; put all sensors in an inactive state
         services.getSensors().disable();

         // Verify config file has been loaded and System object is valid
         if (isConfigFileLoaded())
         {
             // Close the regulator devices in the system.  Monitoring is
             // normally disabled because the system is being powered off.  The
             // devices should be closed in case hardware is removed or replaced
             // while the system is powered off.
             system->closeDevices(services);
         }
     }
 }

 void Manager::sighupHandler(sdeventplus::source::Signal& /*sigSrc*/,
                             const struct signalfd_siginfo* /*sigInfo*/)
 {
     // Reload the JSON configuration file
     loadConfigFile();
 }

 void Manager::timerExpired()
 {
     // Notify sensors service that a sensor monitoring cycle is starting
     services.getSensors().startCycle();

     // Verify config file has been loaded and System object is valid
     if (isConfigFileLoaded())
     {
         // Monitor sensors for the voltage rails in the system
         system->monitorSensors(services);
     }

     // Notify sensors service that current sensor monitoring cycle has ended
     services.getSensors().endCycle();
 }

 void Manager::clearHardwareData()
 {
     // Clear any cached hardware presence data and VPD values
     services.getPresenceService().clearCache();
     services.getVPD().clearCache();

     // Verify config file has been loaded and System object is valid
     if (isConfigFileLoaded())
     {
         // Clear any cached hardware data in the System object
         system->clearCache();

         // Clear error history related to hardware devices in the System object
         system->clearErrorHistory();
     }
 }

 void Manager::findCompatibleSystemTypes()
 {
     using namespace phosphor::power::util;

     try
     {
         // Query object mapper for object paths that implement the compatible
         // interface.  Returns a map of object paths to a map of services names
         // to their interfaces.
         DbusSubtree subTree = getSubTree(bus, "/xyz/openbmc_project/inventory",
                                          compatibleIntf, 0);

         // Get the first object path
         auto objectIt = subTree.cbegin();
         if (objectIt != subTree.cend())
         {
             std::string objPath = objectIt->first;

             // Get the first service name
             auto serviceIt = objectIt->second.cbegin();
             if (serviceIt != objectIt->second.cend())
             {
                 std::string service = serviceIt->first;
                 if (!service.empty())
                 {
                     // Get compatible system types property value
                     getProperty(compatibleIntf, compatibleNamesProp, objPath,
                                 service, bus, compatibleSystemTypes);
                 }
             }
         }
     }
     catch (const std::exception&)
     {
         // Compatible system types information is not available.  The current
         // system might not support the interface, or the service that
         // implements the interface might not be running yet.
     }
 }

 fs::path Manager::findConfigFile()
 {
     // Build list of possible base file names
     std::vector<std::string> fileNames{};

     // Add possible file names based on compatible system types (if any)
     for (const std::string& systemType : compatibleSystemTypes)
     {
         // Replace all spaces and commas in system type name with underscores
         std::string fileName{systemType};
         std::replace(fileName.begin(), fileName.end(), ' ', '_');
         std::replace(fileName.begin(), fileName.end(), ',', '_');

         // Append .json suffix and add to list
         fileName.append(".json");
         fileNames.emplace_back(fileName);
     }

     // Add default file name for systems that don't use compatible interface
     fileNames.emplace_back(defaultConfigFileName);

     // Look for a config file with one of the possible base names
     for (const std::string& fileName : fileNames)
     {
         // Check if file exists in test directory
         fs::path pathName{testConfigFileDir / fileName};
         if (fs::exists(pathName))
         {
             return pathName;
         }

         // Check if file exists in standard directory
         pathName = standardConfigFileDir / fileName;
         if (fs::exists(pathName))
         {
             return pathName;
         }
     }

     // No config file found; return empty path
     return fs::path{};
 }

 bool Manager::isSystemPoweredOn()
 {
     bool isOn{false};

     try
     {
         // Get D-Bus property that contains the current power state for
         // chassis0, which represents the entire system (all chassis)
         using namespace phosphor::power::util;
         auto service = getService(chassisStatePath, chassisStateIntf, bus);
         if (!service.empty())
         {
             PowerState currentPowerState;
             getProperty(chassisStateIntf, chassisStateProp, chassisStatePath,
                         service, bus, currentPowerState);
             if (currentPowerState == PowerState::On)
             {
                 isOn = true;
             }
         }
     }
     catch (const std::exception& e)
     {
         // Current power state might not be available yet.  The regulators
         // application can start before the power state is published on D-Bus.
     }

     return isOn;
 }

 void Manager::loadConfigFile()
 {
     try
     {
         // Find the absolute path to the config file
         fs::path pathName = findConfigFile();
         if (!pathName.empty())
         {
             // Log info message in journal; config file path is important
             services.getJournal().logInfo("Loading configuration file " +
                                           pathName.string());

             // Parse the config file
             std::vector<std::unique_ptr<Rule>> rules{};
             std::vector<std::unique_ptr<Chassis>> chassis{};
             std::tie(rules, chassis) = config_file_parser::parse(pathName);

             // Store config file information in a new System object.  The old
             // System object, if any, is automatically deleted.
             system =
                 std::make_unique<System>(std::move(rules), std::move(chassis));
         }
     }
     catch (const std::exception& e)
     {
         // Log error messages in journal
         services.getJournal().logError(exception_utils::getMessages(e));
         services.getJournal().logError("Unable to load configuration file");

         // Log error
         services.getErrorLogging().logConfigFileError(Entry::Level::Error,
                                                       services.getJournal());
     }
 }

 void Manager::waitUntilConfigFileLoaded()
 {
     // If config file not loaded and list of compatible system types is empty
     if (!isConfigFileLoaded() && compatibleSystemTypes.empty())
     {
         // Loop until compatible system types found or waited max amount of time
         auto start = std::chrono::system_clock::now();
         std::chrono::system_clock::duration timeWaited{0};
         while (compatibleSystemTypes.empty() &&
                (timeWaited <= maxTimeToWaitForCompatTypes))
         {
             // Try to find list of compatible system types
             findCompatibleSystemTypes();
             if (!compatibleSystemTypes.empty())
             {
                 // Compatible system types found; try to load config file
                 loadConfigFile();
             }
             else
             {
                 // Sleep 5 seconds
                 using namespace std::chrono_literals;
                 std::this_thread::sleep_for(5s);
             }
             timeWaited = std::chrono::system_clock::now() - start;
         }
     }
 }

 } // namespace phosphor::power::regulators
	/**
	* Copyright © 2020 IBM Corporation
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "manager.hpp"

	#include "chassis.hpp"
	#include "config_file_parser.hpp"
	#include "exception_utils.hpp"
	#include "rule.hpp"
	#include "utility.hpp"

	#include <xyz/openbmc_project/Common/error.hpp>
	#include <xyz/openbmc_project/State/Chassis/server.hpp>

	#include <algorithm>
	#include <chrono>
	#include <exception>
	#include <functional>
	#include <map>
	#include <thread>
	#include <tuple>
	#include <utility>
	#include <variant>

	namespace phosphor::power::regulators
	{

	namespace fs = std::filesystem;

	constexpr auto busName = "xyz.openbmc_project.Power.Regulators";
	constexpr auto managerObjPath = "/xyz/openbmc_project/power/regulators/manager";
	constexpr auto compatibleIntf =
	"xyz.openbmc_project.Configuration.IBMCompatibleSystem";
	constexpr auto compatibleNamesProp = "Names";
	constexpr auto chassisStatePath = "/xyz/openbmc_project/state/chassis0";
	constexpr auto chassisStateIntf = "xyz.openbmc_project.State.Chassis";
	constexpr auto chassisStateProp = "CurrentPowerState";
	constexpr std::chrono::minutes maxTimeToWaitForCompatTypes{5};

	using PowerState =
	sdbusplus::xyz::openbmc_project::State::server::Chassis::PowerState;

	/**
	* Default configuration file name. This is used when the system does not
	* implement the D-Bus compatible interface.
	*/
	constexpr auto defaultConfigFileName = "config.json";

	/**
	* Standard configuration file directory. This directory is part of the
	* firmware install image. It contains the standard version of the config file.
	*/
	const fs::path standardConfigFileDir{"/usr/share/phosphor-regulators"};

	/**
	* Test configuration file directory. This directory can contain a test version
	* of the config file. The test version will override the standard version.
	*/
	const fs::path testConfigFileDir{"/etc/phosphor-regulators"};

	Manager::Manager(sdbusplus::bus::bus& bus, const sdeventplus::Event& event) :
	ManagerObject{bus, managerObjPath, true}, bus{bus}, eventLoop{event},
	services{bus}, timer{event, std::bind(&Manager::timerExpired, this)}
	{
	// Subscribe to D-Bus interfacesAdded signal from Entity Manager. This
	// notifies us if the compatible interface becomes available later.
	std::string matchStr = sdbusplus::bus::match::rules::interfacesAdded() +
	sdbusplus::bus::match::rules::sender(
	"xyz.openbmc_project.EntityManager");
	std::unique_ptr<sdbusplus::server::match::match> matchPtr =
	std::make_unique<sdbusplus::server::match::match>(
	bus, matchStr,
	std::bind(&Manager::interfacesAddedHandler, this,
	std::placeholders::_1));
	signals.emplace_back(std::move(matchPtr));

	// Try to find compatible system types using D-Bus compatible interface.
	// Note that it might not be supported on this system, or the service that
	// provides the interface might not be running yet.
	findCompatibleSystemTypes();

	// Try to find and load the JSON configuration file
	loadConfigFile();

	// Obtain D-Bus service name
	bus.request_name(busName);

	// If system is already powered on, enable monitoring
	if (isSystemPoweredOn())
	{
	monitor(true);
	}
	}

	void Manager::configure()
	{
	// Clear any cached data or error history related to hardware devices
	clearHardwareData();

	// Wait until the config file has been loaded or hit max wait time
	waitUntilConfigFileLoaded();

	// Verify config file has been loaded and System object is valid
	if (isConfigFileLoaded())
	{
	// Configure the regulator devices in the system
	system->configure(services);
	}
	else
	{
	// Write error message to journal
	services.getJournal().logError("Unable to configure regulator devices: "
	"Configuration file not loaded");

	// Log critical error since regulators could not be configured. Could
	// cause hardware damage if default regulator settings are very wrong.
	services.getErrorLogging().logConfigFileError(Entry::Level::Critical,
	services.getJournal());

	// Throw InternalFailure to propogate error status to D-Bus client
	throw sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure{};
	}
	}

	void Manager::interfacesAddedHandler(sdbusplus::message::message& msg)
	{
	// Verify message is valid
	if (!msg)
	{
	return;
	}

	try
	{
	// Read object path for object that was created or had interface added
	sdbusplus::message::object_path objPath;
	msg.read(objPath);

	// Read the dictionary whose keys are interface names and whose values
	// are dictionaries containing the interface property names and values
	std::map<std::string,
	std::map<std::string, std::variant<std::vector<std::string>>>>
	intfProp;
	msg.read(intfProp);

	// Find the compatible interface, if present
	auto itIntf = intfProp.find(compatibleIntf);
	if (itIntf != intfProp.cend())
	{
	// Find the Names property of the compatible interface, if present
	auto itProp = itIntf->second.find(compatibleNamesProp);
	if (itProp != itIntf->second.cend())
	{
	// Get value of Names property
	auto propValue = std::get<0>(itProp->second);
	if (!propValue.empty())
	{
	// Store list of compatible system types
	compatibleSystemTypes = propValue;

	// Find and load JSON config file based on system types
	loadConfigFile();
	}
	}
	}
	}
	catch (const std::exception&)
	{
	// Error trying to read interfacesAdded message. One possible cause
	// could be a property whose value is not a std::vector<std::string>.
	}
	}

	void Manager::monitor(bool enable)
	{
	// Check whether already in the requested monitoring state
	if (enable == isMonitoringEnabled)
	{
	return;
	}

	isMonitoringEnabled = enable;
	if (isMonitoringEnabled)
	{
	services.getJournal().logDebug("Monitoring enabled");

	// Restart timer to have a repeating 1 second interval
	timer.restart(std::chrono::seconds(1));

	// Enable sensors service; put all sensors in an active state
	services.getSensors().enable();
	}
	else
	{
	services.getJournal().logDebug("Monitoring disabled");

	// Disable timer
	timer.setEnabled(false);

	// Disable sensors service; put all sensors in an inactive state
	services.getSensors().disable();

	// Verify config file has been loaded and System object is valid
	if (isConfigFileLoaded())
	{
	// Close the regulator devices in the system. Monitoring is
	// normally disabled because the system is being powered off. The
	// devices should be closed in case hardware is removed or replaced
	// while the system is powered off.
	system->closeDevices(services);
	}
	}
	}

	void Manager::sighupHandler(sdeventplus::source::Signal& /sigSrc/,
	const struct signalfd_siginfo* /sigInfo/)
	{
	// Reload the JSON configuration file
	loadConfigFile();
	}

	void Manager::timerExpired()
	{
	// Notify sensors service that a sensor monitoring cycle is starting
	services.getSensors().startCycle();

	// Verify config file has been loaded and System object is valid
	if (isConfigFileLoaded())
	{
	// Monitor sensors for the voltage rails in the system
	system->monitorSensors(services);
	}

	// Notify sensors service that current sensor monitoring cycle has ended
	services.getSensors().endCycle();
	}

	void Manager::clearHardwareData()
	{
	// Clear any cached hardware presence data and VPD values
	services.getPresenceService().clearCache();
	services.getVPD().clearCache();

	// Verify config file has been loaded and System object is valid
	if (isConfigFileLoaded())
	{
	// Clear any cached hardware data in the System object
	system->clearCache();

	// Clear error history related to hardware devices in the System object
	system->clearErrorHistory();
	}
	}

	void Manager::findCompatibleSystemTypes()
	{
	using namespace phosphor::power::util;

	try
	{
	// Query object mapper for object paths that implement the compatible
	// interface. Returns a map of object paths to a map of services names
	// to their interfaces.
	DbusSubtree subTree = getSubTree(bus, "/xyz/openbmc_project/inventory",
	compatibleIntf, 0);

	// Get the first object path
	auto objectIt = subTree.cbegin();
	if (objectIt != subTree.cend())
	{
	std::string objPath = objectIt->first;

	// Get the first service name
	auto serviceIt = objectIt->second.cbegin();
	if (serviceIt != objectIt->second.cend())
	{
	std::string service = serviceIt->first;
	if (!service.empty())
	{
	// Get compatible system types property value
	getProperty(compatibleIntf, compatibleNamesProp, objPath,
	service, bus, compatibleSystemTypes);
	}
	}
	}
	}
	catch (const std::exception&)
	{
	// Compatible system types information is not available. The current
	// system might not support the interface, or the service that
	// implements the interface might not be running yet.
	}
	}

	fs::path Manager::findConfigFile()
	{
	// Build list of possible base file names
	std::vector<std::string> fileNames{};

	// Add possible file names based on compatible system types (if any)
	for (const std::string& systemType : compatibleSystemTypes)
	{
	// Replace all spaces and commas in system type name with underscores
	std::string fileName{systemType};
	std::replace(fileName.begin(), fileName.end(), ' ', '_');
	std::replace(fileName.begin(), fileName.end(), ',', '_');

	// Append .json suffix and add to list
	fileName.append(".json");
	fileNames.emplace_back(fileName);
	}

	// Add default file name for systems that don't use compatible interface
	fileNames.emplace_back(defaultConfigFileName);

	// Look for a config file with one of the possible base names
	for (const std::string& fileName : fileNames)
	{
	// Check if file exists in test directory
	fs::path pathName{testConfigFileDir / fileName};
	if (fs::exists(pathName))
	{
	return pathName;
	}

	// Check if file exists in standard directory
	pathName = standardConfigFileDir / fileName;
	if (fs::exists(pathName))
	{
	return pathName;
	}
	}

	// No config file found; return empty path
	return fs::path{};
	}

	bool Manager::isSystemPoweredOn()
	{
	bool isOn{false};

	try
	{
	// Get D-Bus property that contains the current power state for
	// chassis0, which represents the entire system (all chassis)
	using namespace phosphor::power::util;
	auto service = getService(chassisStatePath, chassisStateIntf, bus);
	if (!service.empty())
	{
	PowerState currentPowerState;
	getProperty(chassisStateIntf, chassisStateProp, chassisStatePath,
	service, bus, currentPowerState);
	if (currentPowerState == PowerState::On)
	{
	isOn = true;
	}
	}
	}
	catch (const std::exception& e)
	{
	// Current power state might not be available yet. The regulators
	// application can start before the power state is published on D-Bus.
	}

	return isOn;
	}

	void Manager::loadConfigFile()
	{
	try
	{
	// Find the absolute path to the config file
	fs::path pathName = findConfigFile();
	if (!pathName.empty())
	{
	// Log info message in journal; config file path is important
	services.getJournal().logInfo("Loading configuration file " +
	pathName.string());

	// Parse the config file
	std::vector<std::unique_ptr<Rule>> rules{};
	std::vector<std::unique_ptr<Chassis>> chassis{};
	std::tie(rules, chassis) = config_file_parser::parse(pathName);

	// Store config file information in a new System object. The old
	// System object, if any, is automatically deleted.
	system =
	std::make_unique<System>(std::move(rules), std::move(chassis));
	}
	}
	catch (const std::exception& e)
	{
	// Log error messages in journal
	services.getJournal().logError(exception_utils::getMessages(e));
	services.getJournal().logError("Unable to load configuration file");

	// Log error
	services.getErrorLogging().logConfigFileError(Entry::Level::Error,
	services.getJournal());
	}
	}

	void Manager::waitUntilConfigFileLoaded()
	{
	// If config file not loaded and list of compatible system types is empty
	if (!isConfigFileLoaded() && compatibleSystemTypes.empty())
	{
	// Loop until compatible system types found or waited max amount of time
	auto start = std::chrono::system_clock::now();
	std::chrono::system_clock::duration timeWaited{0};
	while (compatibleSystemTypes.empty() &&
	(timeWaited <= maxTimeToWaitForCompatTypes))
	{
	// Try to find list of compatible system types
	findCompatibleSystemTypes();
	if (!compatibleSystemTypes.empty())
	{
	// Compatible system types found; try to load config file
	loadConfigFile();
	}
	else
	{
	// Sleep 5 seconds
	using namespace std::chrono_literals;
	std::this_thread::sleep_for(5s);
	}
	timeWaited = std::chrono::system_clock::now() - start;
	}
	}
	}

	} // namespace phosphor::power::regulators