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#include "watchdog.hpp"
#include <chrono>
#include <phosphor-logging/elog.hpp>
#include <phosphor-logging/log.hpp>
#include <sdbusplus/exception.hpp>
#include <xyz/openbmc_project/Common/error.hpp>
namespace phosphor
{
namespace watchdog
{
using namespace std::chrono;
using namespace std::chrono_literals;
using namespace phosphor::logging;
using sdbusplus::exception::SdBusError;
using sdbusplus::xyz::openbmc_project::Common::Error::InternalFailure;
// systemd service to kick start a target.
constexpr auto SYSTEMD_SERVICE = "org.freedesktop.systemd1";
constexpr auto SYSTEMD_ROOT = "/org/freedesktop/systemd1";
constexpr auto SYSTEMD_INTERFACE = "org.freedesktop.systemd1.Manager";
void Watchdog::resetTimeRemaining(bool enableWatchdog)
{
timeRemaining(interval());
if (enableWatchdog)
{
enabled(true);
}
}
// Enable or disable watchdog
bool Watchdog::enabled(bool value)
{
if (!value)
{
// Make sure we accurately reflect our enabled state to the
// tryFallbackOrDisable() call
WatchdogInherits::enabled(value);
// Attempt to fallback or disable our timer if needed
tryFallbackOrDisable();
return false;
}
else if (!this->enabled())
{
auto interval_ms = this->interval();
timer.restart(milliseconds(interval_ms));
log<level::INFO>("watchdog: enabled and started",
entry("INTERVAL=%llu", interval_ms));
}
return WatchdogInherits::enabled(value);
}
// Get the remaining time before timer expires.
// If the timer is disabled, returns 0
uint64_t Watchdog::timeRemaining() const
{
// timer may have already expired and disabled
if (!timerEnabled())
{
return 0;
}
return duration_cast<milliseconds>(timer.getRemaining()).count();
}
// Reset the timer to a new expiration value
uint64_t Watchdog::timeRemaining(uint64_t value)
{
if (!timerEnabled())
{
// We don't need to update the timer because it is off
return 0;
}
if (!this->enabled())
{
// Having a timer but not displaying an enabled value means we
// are inside of the fallback
value = fallback->interval;
}
// Update new expiration
timer.setRemaining(milliseconds(value));
// Update Base class data.
return WatchdogInherits::timeRemaining(value);
}
// Optional callback function on timer expiration
void Watchdog::timeOutHandler()
{
Action action = expireAction();
if (!this->enabled())
{
action = fallback->action;
}
expiredTimerUse(currentTimerUse());
auto target = actionTargetMap.find(action);
if (target == actionTargetMap.end())
{
log<level::INFO>("watchdog: Timed out with no target",
entry("ACTION=%s", convertForMessage(action).c_str()),
entry("TIMER_USE=%s",
convertForMessage(expiredTimerUse()).c_str()));
}
else
{
log<level::INFO>(
"watchdog: Timed out",
entry("ACTION=%s", convertForMessage(action).c_str()),
entry("TIMER_USE=%s", convertForMessage(expiredTimerUse()).c_str()),
entry("TARGET=%s", target->second.c_str()));
try
{
auto method = bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_ROOT,
SYSTEMD_INTERFACE, "StartUnit");
method.append(target->second);
method.append("replace");
bus.call_noreply(method);
}
catch (const SdBusError& e)
{
log<level::ERR>("watchdog: Failed to start unit",
entry("TARGET=%s", target->second.c_str()),
entry("ERROR=%s", e.what()));
commit<InternalFailure>();
}
}
tryFallbackOrDisable();
}
void Watchdog::tryFallbackOrDisable()
{
// We only re-arm the watchdog if we were already enabled and have
// a possible fallback
if (fallback && (fallback->always || this->enabled()))
{
auto interval_ms = fallback->interval;
timer.restart(milliseconds(interval_ms));
log<level::INFO>("watchdog: falling back",
entry("INTERVAL=%llu", interval_ms));
}
else if (timerEnabled())
{
timer.setEnabled(false);
log<level::INFO>("watchdog: disabled");
}
// Make sure we accurately reflect our enabled state to the
// dbus interface.
WatchdogInherits::enabled(false);
}
} // namespace watchdog
} // namespace phosphor
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