From af3a7d07b801c22a03350897c2186b1ee9507ff2 Mon Sep 17 00:00:00 2001
From: Yong Li <yong.b.li@linux.intel.com>
Date: Sun, 14 Apr 2019 11:14:09 +0800
Subject: [PATCH] Add restart cause support

Add restart cause support for watchdog expiration, to support
Get system restart cause command defined in IPMI spec

Tested:
Set a hard reset watchdog:
ipmitool raw 0x06 0x24 0x5 0x1 0x0 0x0 0x64 0x00

Start the timer:
ipmitool mc watchdog reset

Wait for 10 seconds, host will be restart, query the restart cause:
Ipmitool chassis restart_cause
System restart cause: watchdog expired

Signed-off-by: Yong Li <yong.b.li@linux.intel.com>
---
 watchdog.cpp | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/watchdog.cpp b/watchdog.cpp
index 008cde5..7f1ec05 100644
--- a/watchdog.cpp
+++ b/watchdog.cpp
@@ -7,6 +7,7 @@
 #include <phosphor-logging/log.hpp>
 #include <sdbusplus/exception.hpp>
 #include <xyz/openbmc_project/Common/error.hpp>
+#include <xyz/openbmc_project/State/Host/server.hpp>
 
 namespace phosphor
 {
@@ -24,6 +25,12 @@ constexpr auto SYSTEMD_SERVICE = "org.freedesktop.systemd1";
 constexpr auto SYSTEMD_ROOT = "/org/freedesktop/systemd1";
 constexpr auto SYSTEMD_INTERFACE = "org.freedesktop.systemd1.Manager";
 
+// host state manager service
+static constexpr const char* hostService = "xyz.openbmc_project.State.Host";
+static constexpr const char* hostPath = "/xyz/openbmc_project/state/host0";
+static constexpr const char* hostInterface = "xyz.openbmc_project.State.Host";
+static constexpr const char* dbusPropIf = "org.freedesktop.DBus.Properties";
+
 void Watchdog::resetTimeRemaining(bool enableWatchdog)
 {
     timeRemaining(interval());
@@ -139,6 +146,29 @@ void Watchdog::timeOutHandler()
                             entry("ERROR=%s", e.what()));
             commit<InternalFailure>();
         }
+
+        // set restart cause for watchdog HardReset & PowerCycle actions
+        if ((action == Watchdog::Action::HardReset) ||
+            (action == Watchdog::Action::PowerCycle))
+        {
+            sdbusplus::message::variant<std::string> property =
+                convertForMessage(
+                    (sdbusplus::xyz::openbmc_project::State::server::Host::
+                         RestartCause::WatchdogTimer));
+            try
+            {
+                auto method = bus.new_method_call(hostService, hostPath,
+                                                  dbusPropIf, "Set");
+                method.append(hostInterface, "HostRestartCause", property);
+                bus.call(method);
+            }
+            catch (sdbusplus::exception_t& e)
+            {
+                log<level::ERR>("Failed to set HostRestartCause property",
+                                entry("ERROR=%s", e.what()));
+                commit<InternalFailure>();
+            }
+        }
     }
 
     tryFallbackOrDisable();
-- 
2.7.4