bmc_state_manager.cpp - openbmc/phosphor-state-manager - Gitiles

 #include "bmc_state_manager.hpp"

 #include "utils.hpp"
 #include "xyz/openbmc_project/Common/error.hpp"

 #include <gpiod.h>
 #include <sys/sysinfo.h>

 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/lg2.hpp>
 #include <sdbusplus/exception.hpp>

 #include <cassert>
 #include <filesystem>
 #include <fstream>
 #include <iostream>

 namespace phosphor
 {
 namespace state
 {
 namespace manager
 {

 PHOSPHOR_LOG2_USING;

 // When you see server:: you know we're referencing our base class
 namespace server = sdbusplus::xyz::openbmc_project::State::server;

 using namespace phosphor::logging;
 using sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;

 constexpr auto obmcQuiesceTarget = "obmc-bmc-service-quiesce@0.target";
 constexpr auto obmcStandbyTarget = "multi-user.target";
 constexpr auto signalDone = "done";
 constexpr auto activeState = "active";

 /* Map a transition to it's systemd target */
 const std::map<server::BMC::Transition, const char*> SYSTEMD_TABLE = {
     {server::BMC::Transition::Reboot, "reboot.target"}};

 constexpr auto SYSTEMD_SERVICE = "org.freedesktop.systemd1";
 constexpr auto SYSTEMD_OBJ_PATH = "/org/freedesktop/systemd1";
 constexpr auto SYSTEMD_INTERFACE = "org.freedesktop.systemd1.Manager";
 constexpr auto SYSTEMD_PRP_INTERFACE = "org.freedesktop.DBus.Properties";

 std::string BMC::getUnitState(const std::string& unitToCheck)
 {
     std::variant<std::string> currentState;
     sdbusplus::message::object_path unitTargetPath;

     auto method = this->bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH,
                                             SYSTEMD_INTERFACE, "GetUnit");

     method.append(unitToCheck);

     try
     {
         auto result = this->bus.call(method);
         result.read(unitTargetPath);
     }
     catch (const sdbusplus::exception_t& e)
     {
         // Not all input units will have been loaded yet so just return an
         // empty string if an exception is caught in this path
         info("Unit {UNIT} not found: {ERROR}", "UNIT", unitToCheck, "ERROR", e);
         return std::string{};
     }

     method = this->bus.new_method_call(
         SYSTEMD_SERVICE,
         static_cast<const std::string&>(unitTargetPath).c_str(),
         SYSTEMD_PRP_INTERFACE, "Get");

     method.append("org.freedesktop.systemd1.Unit", "ActiveState");

     try
     {
         auto result = this->bus.call(method);

         // Is input target active or inactive?
         result.read(currentState);
     }
     catch (const sdbusplus::exception_t& e)
     {
         info("Error in ActiveState Get: {ERROR}", "ERROR", e);
         return std::string{};
     }
     return (std::get<std::string>(currentState));
 }

 void BMC::discoverInitialState()
 {
     // First look to see if the BMC quiesce target is active
     auto currentStateStr = getUnitState(obmcQuiesceTarget);
     if (currentStateStr == activeState)
     {
         info("Setting the BMCState field to BMC_QUIESCED");
         this->currentBMCState(BMCState::Quiesced);
         return;
     }

     // If not quiesced, then check standby target
     currentStateStr = getUnitState(obmcStandbyTarget);
     if (currentStateStr == activeState)
     {
         info("Setting the BMCState field to BMC_READY");
         this->currentBMCState(BMCState::Ready);
     }
     else
     {
         info("Setting the BMCState field to BMC_NOTREADY");
         this->currentBMCState(BMCState::NotReady);
     }

     return;
 }

 void BMC::subscribeToSystemdSignals()
 {
     auto method = this->bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH,
                                             SYSTEMD_INTERFACE, "Subscribe");

     try
     {
         this->bus.call(method);
     }
     catch (const sdbusplus::exception_t& e)
     {
         error("Failed to subscribe to systemd signals: {ERROR}", "ERROR", e);
         elog<InternalFailure>();
     }

     return;
 }

 void BMC::executeTransition(const Transition tranReq)
 {
     // HardReboot does not shutdown any services and immediately transitions
     // into the reboot process
     if (server::BMC::Transition::HardReboot == tranReq)
     {
         // Put BMC state not NotReady when issuing a BMC reboot
         // and stop monitoring for state changes
         this->currentBMCState(BMCState::NotReady);
         this->stateSignal.reset();

         auto method = this->bus.new_method_call(
             SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH, SYSTEMD_INTERFACE, "Reboot");
         try
         {
             this->bus.call(method);
         }
         catch (const sdbusplus::exception_t& e)
         {
             info("Error in HardReboot: {ERROR}", "ERROR", e);
         }
     }
     else
     {
         // Check to make sure it can be found
         auto iter = SYSTEMD_TABLE.find(tranReq);
         if (iter == SYSTEMD_TABLE.end())
             return;

         const auto& sysdUnit = iter->second;

         auto method = this->bus.new_method_call(
             SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH, SYSTEMD_INTERFACE, "StartUnit");
         // The only valid transition is reboot and that
         // needs to be irreversible once started

         method.append(sysdUnit, "replace-irreversibly");

         // Put BMC state not NotReady when issuing a BMC reboot
         // and stop monitoring for state changes
         this->currentBMCState(BMCState::NotReady);
         this->stateSignal.reset();

         try
         {
             this->bus.call(method);
         }
         catch (const sdbusplus::exception_t& e)
         {
             info("Error in StartUnit - replace-irreversibly: {ERROR}", "ERROR",
                  e);
         }
     }
     return;
 }

 int BMC::bmcStateChange(sdbusplus::message_t& msg)
 {
     uint32_t newStateID{};
     sdbusplus::message::object_path newStateObjPath;
     std::string newStateUnit{};
     std::string newStateResult{};

     // Read the msg and populate each variable
     msg.read(newStateID, newStateObjPath, newStateUnit, newStateResult);

     if ((newStateUnit == obmcQuiesceTarget) && (newStateResult == signalDone))
     {
         error("BMC has entered BMC_QUIESCED state");
         this->currentBMCState(BMCState::Quiesced);

         // There is no getting out of Quiesced once entered (other then BMC
         // reboot) so stop watching for signals
         auto method =
             this->bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH,
                                       SYSTEMD_INTERFACE, "Unsubscribe");

         try
         {
             this->bus.call(method);
         }
         catch (const sdbusplus::exception_t& e)
         {
             info("Error in Unsubscribe: {ERROR}", "ERROR", e);
         }

         // disable the system state change object as well
         this->stateSignal.reset();

         return 0;
     }

     // Caught the signal that indicates the BMC is now BMC_READY
     if ((newStateUnit == obmcStandbyTarget) && (newStateResult == signalDone))
     {
         info("BMC_READY");
         this->currentBMCState(BMCState::Ready);
     }

     return 0;
 }

 BMC::Transition BMC::requestedBMCTransition(Transition value)
 {
     info("Setting the RequestedBMCTransition field to "
          "{REQUESTED_BMC_TRANSITION}",
          "REQUESTED_BMC_TRANSITION", value);

     executeTransition(value);
     return server::BMC::requestedBMCTransition(value);
 }

 BMC::BMCState BMC::currentBMCState(BMCState value)
 {
     info("Setting the BMCState field to {CURRENT_BMC_STATE}",
          "CURRENT_BMC_STATE", value);

     return server::BMC::currentBMCState(value);
 }

 BMC::RebootCause BMC::lastRebootCause(RebootCause value)
 {
     info("Setting the RebootCause field to {LAST_REBOOT_CAUSE}",
          "LAST_REBOOT_CAUSE", value);

     return server::BMC::lastRebootCause(value);
 }

 uint64_t BMC::lastRebootTime() const
 {
     using namespace std::chrono;
     struct sysinfo info;

     auto rc = sysinfo(&info);
     assert(rc == 0);

     // Since uptime is in seconds, also get the current time in seconds.
     auto now = time_point_cast<seconds>(system_clock::now());
     auto rebootTime = now - seconds(info.uptime);

     return duration_cast<milliseconds>(rebootTime.time_since_epoch()).count();
 }

 void BMC::discoverLastRebootCause()
 {
     uint64_t bootReason = 0;
     std::ifstream file;
     auto bootstatusPath = "/sys/class/watchdog/watchdog0/bootstatus";

     file.exceptions(std::ifstream::failbit | std::ifstream::badbit |
                     std::ifstream::eofbit);

     try
     {
         file.open(bootstatusPath);
         file >> bootReason;
     }
     catch (const std::exception& e)
     {
         auto rc = errno;
         error("Failed to read sysfs file {FILE} with errno {ERRNO}", "FILE",
               bootstatusPath, "ERRNO", rc);
     }

     switch (bootReason)
     {
         case WDIOF_EXTERN1:
             this->lastRebootCause(RebootCause::Watchdog);
             return;
         case WDIOF_CARDRESET:
             this->lastRebootCause(RebootCause::POR);
             return;
         default:
             this->lastRebootCause(RebootCause::Unknown);
             // Continue below to see if more details can be found
             // on reason for reboot
             break;
     }

     // If the above code could not detect a reason, check to see
     // if an AC loss occured.
     size_t chassisId = 0;
     if (phosphor::state::manager::utils::checkACLoss(chassisId))
     {
         this->lastRebootCause(RebootCause::POR);
         return;
     }

     // If the above code could not detect a reason, look for a the
     // reset-cause-pinhole gpio to see if it is the reason for the reboot
     auto gpioval =
         phosphor::state::manager::utils::getGpioValue("reset-cause-pinhole");

     // A 0 indicates a pinhole reset occurred
     if (0 == gpioval)
     {
         info("The BMC reset was caused by a pinhole reset");
         this->lastRebootCause(RebootCause::PinholeReset);

         // Generate log telling user a pinhole reset has occurred
         const std::string errorMsg = "xyz.openbmc_project.State.PinholeReset";
         phosphor::state::manager::utils::createError(
             this->bus, errorMsg,
             sdbusplus::xyz::openbmc_project::Logging::server::Entry::Level::
                 Notice);
     }

     return;
 }

 } // namespace manager
 } // namespace state
 } // namespace phosphor
	#include "bmc_state_manager.hpp"

	#include "utils.hpp"
	#include "xyz/openbmc_project/Common/error.hpp"

	#include <gpiod.h>
	#include <sys/sysinfo.h>

	#include <phosphor-logging/elog-errors.hpp>
	#include <phosphor-logging/lg2.hpp>
	#include <sdbusplus/exception.hpp>

	#include <cassert>
	#include <filesystem>
	#include <fstream>
	#include <iostream>

	namespace phosphor
	{
	namespace state
	{
	namespace manager
	{

	PHOSPHOR_LOG2_USING;

	// When you see server:: you know we're referencing our base class
	namespace server = sdbusplus::xyz::openbmc_project::State::server;

	using namespace phosphor::logging;
	using sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;

	constexpr auto obmcQuiesceTarget = "obmc-bmc-service-quiesce@0.target";
	constexpr auto obmcStandbyTarget = "multi-user.target";
	constexpr auto signalDone = "done";
	constexpr auto activeState = "active";

	/* Map a transition to it's systemd target */
	const std::map<server::BMC::Transition, const char*> SYSTEMD_TABLE = {
	{server::BMC::Transition::Reboot, "reboot.target"}};

	constexpr auto SYSTEMD_SERVICE = "org.freedesktop.systemd1";
	constexpr auto SYSTEMD_OBJ_PATH = "/org/freedesktop/systemd1";
	constexpr auto SYSTEMD_INTERFACE = "org.freedesktop.systemd1.Manager";
	constexpr auto SYSTEMD_PRP_INTERFACE = "org.freedesktop.DBus.Properties";

	std::string BMC::getUnitState(const std::string& unitToCheck)
	{
	std::variant<std::string> currentState;
	sdbusplus::message::object_path unitTargetPath;

	auto method = this->bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH,
	SYSTEMD_INTERFACE, "GetUnit");

	method.append(unitToCheck);

	try
	{
	auto result = this->bus.call(method);
	result.read(unitTargetPath);
	}
	catch (const sdbusplus::exception_t& e)
	{
	// Not all input units will have been loaded yet so just return an
	// empty string if an exception is caught in this path
	info("Unit {UNIT} not found: {ERROR}", "UNIT", unitToCheck, "ERROR", e);
	return std::string{};
	}

	method = this->bus.new_method_call(
	SYSTEMD_SERVICE,
	static_cast<const std::string&>(unitTargetPath).c_str(),
	SYSTEMD_PRP_INTERFACE, "Get");

	method.append("org.freedesktop.systemd1.Unit", "ActiveState");

	try
	{
	auto result = this->bus.call(method);

	// Is input target active or inactive?
	result.read(currentState);
	}
	catch (const sdbusplus::exception_t& e)
	{
	info("Error in ActiveState Get: {ERROR}", "ERROR", e);
	return std::string{};
	}
	return (std::get<std::string>(currentState));
	}

	void BMC::discoverInitialState()
	{
	// First look to see if the BMC quiesce target is active
	auto currentStateStr = getUnitState(obmcQuiesceTarget);
	if (currentStateStr == activeState)
	{
	info("Setting the BMCState field to BMC_QUIESCED");
	this->currentBMCState(BMCState::Quiesced);
	return;
	}

	// If not quiesced, then check standby target
	currentStateStr = getUnitState(obmcStandbyTarget);
	if (currentStateStr == activeState)
	{
	info("Setting the BMCState field to BMC_READY");
	this->currentBMCState(BMCState::Ready);
	}
	else
	{
	info("Setting the BMCState field to BMC_NOTREADY");
	this->currentBMCState(BMCState::NotReady);
	}

	return;
	}

	void BMC::subscribeToSystemdSignals()
	{
	auto method = this->bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH,
	SYSTEMD_INTERFACE, "Subscribe");

	try
	{
	this->bus.call(method);
	}
	catch (const sdbusplus::exception_t& e)
	{
	error("Failed to subscribe to systemd signals: {ERROR}", "ERROR", e);
	elog<InternalFailure>();
	}

	return;
	}

	void BMC::executeTransition(const Transition tranReq)
	{
	// HardReboot does not shutdown any services and immediately transitions
	// into the reboot process
	if (server::BMC::Transition::HardReboot == tranReq)
	{
	// Put BMC state not NotReady when issuing a BMC reboot
	// and stop monitoring for state changes
	this->currentBMCState(BMCState::NotReady);
	this->stateSignal.reset();

	auto method = this->bus.new_method_call(
	SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH, SYSTEMD_INTERFACE, "Reboot");
	try
	{
	this->bus.call(method);
	}
	catch (const sdbusplus::exception_t& e)
	{
	info("Error in HardReboot: {ERROR}", "ERROR", e);
	}
	}
	else
	{
	// Check to make sure it can be found
	auto iter = SYSTEMD_TABLE.find(tranReq);
	if (iter == SYSTEMD_TABLE.end())
	return;

	const auto& sysdUnit = iter->second;

	auto method = this->bus.new_method_call(
	SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH, SYSTEMD_INTERFACE, "StartUnit");
	// The only valid transition is reboot and that
	// needs to be irreversible once started

	method.append(sysdUnit, "replace-irreversibly");

	// Put BMC state not NotReady when issuing a BMC reboot
	// and stop monitoring for state changes
	this->currentBMCState(BMCState::NotReady);
	this->stateSignal.reset();

	try
	{
	this->bus.call(method);
	}
	catch (const sdbusplus::exception_t& e)
	{
	info("Error in StartUnit - replace-irreversibly: {ERROR}", "ERROR",
	e);
	}
	}
	return;
	}

	int BMC::bmcStateChange(sdbusplus::message_t& msg)
	{
	uint32_t newStateID{};
	sdbusplus::message::object_path newStateObjPath;
	std::string newStateUnit{};
	std::string newStateResult{};

	// Read the msg and populate each variable
	msg.read(newStateID, newStateObjPath, newStateUnit, newStateResult);

	if ((newStateUnit == obmcQuiesceTarget) && (newStateResult == signalDone))
	{
	error("BMC has entered BMC_QUIESCED state");
	this->currentBMCState(BMCState::Quiesced);

	// There is no getting out of Quiesced once entered (other then BMC
	// reboot) so stop watching for signals
	auto method =
	this->bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH,
	SYSTEMD_INTERFACE, "Unsubscribe");

	try
	{
	this->bus.call(method);
	}
	catch (const sdbusplus::exception_t& e)
	{
	info("Error in Unsubscribe: {ERROR}", "ERROR", e);
	}

	// disable the system state change object as well
	this->stateSignal.reset();

	return 0;
	}

	// Caught the signal that indicates the BMC is now BMC_READY
	if ((newStateUnit == obmcStandbyTarget) && (newStateResult == signalDone))
	{
	info("BMC_READY");
	this->currentBMCState(BMCState::Ready);
	}

	return 0;
	}

	BMC::Transition BMC::requestedBMCTransition(Transition value)
	{
	info("Setting the RequestedBMCTransition field to "
	"{REQUESTED_BMC_TRANSITION}",
	"REQUESTED_BMC_TRANSITION", value);

	executeTransition(value);
	return server::BMC::requestedBMCTransition(value);
	}

	BMC::BMCState BMC::currentBMCState(BMCState value)
	{
	info("Setting the BMCState field to {CURRENT_BMC_STATE}",
	"CURRENT_BMC_STATE", value);

	return server::BMC::currentBMCState(value);
	}

	BMC::RebootCause BMC::lastRebootCause(RebootCause value)
	{
	info("Setting the RebootCause field to {LAST_REBOOT_CAUSE}",
	"LAST_REBOOT_CAUSE", value);

	return server::BMC::lastRebootCause(value);
	}

	uint64_t BMC::lastRebootTime() const
	{
	using namespace std::chrono;
	struct sysinfo info;

	auto rc = sysinfo(&info);
	assert(rc == 0);

	// Since uptime is in seconds, also get the current time in seconds.
	auto now = time_point_cast<seconds>(system_clock::now());
	auto rebootTime = now - seconds(info.uptime);

	return duration_cast<milliseconds>(rebootTime.time_since_epoch()).count();
	}

	void BMC::discoverLastRebootCause()
	{
	uint64_t bootReason = 0;
	std::ifstream file;
	auto bootstatusPath = "/sys/class/watchdog/watchdog0/bootstatus";

	file.exceptions(std::ifstream::failbit \| std::ifstream::badbit \|
	std::ifstream::eofbit);

	try
	{
	file.open(bootstatusPath);
	file >> bootReason;
	}
	catch (const std::exception& e)
	{
	auto rc = errno;
	error("Failed to read sysfs file {FILE} with errno {ERRNO}", "FILE",
	bootstatusPath, "ERRNO", rc);
	}

	switch (bootReason)
	{
	case WDIOF_EXTERN1:
	this->lastRebootCause(RebootCause::Watchdog);
	return;
	case WDIOF_CARDRESET:
	this->lastRebootCause(RebootCause::POR);
	return;
	default:
	this->lastRebootCause(RebootCause::Unknown);
	// Continue below to see if more details can be found
	// on reason for reboot
	break;
	}

	// If the above code could not detect a reason, check to see
	// if an AC loss occured.
	size_t chassisId = 0;
	if (phosphor::state::manager::utils::checkACLoss(chassisId))
	{
	this->lastRebootCause(RebootCause::POR);
	return;
	}

	// If the above code could not detect a reason, look for a the
	// reset-cause-pinhole gpio to see if it is the reason for the reboot
	auto gpioval =
	phosphor::state::manager::utils::getGpioValue("reset-cause-pinhole");

	// A 0 indicates a pinhole reset occurred
	if (0 == gpioval)
	{
	info("The BMC reset was caused by a pinhole reset");
	this->lastRebootCause(RebootCause::PinholeReset);

	// Generate log telling user a pinhole reset has occurred
	const std::string errorMsg = "xyz.openbmc_project.State.PinholeReset";
	phosphor::state::manager::utils::createError(
	this->bus, errorMsg,
	sdbusplus::xyz::openbmc_project::Logging::server::Entry::Level::
	Notice);
	}

	return;
	}

	} // namespace manager
	} // namespace state
	} // namespace phosphor