From 6d5a372e0cf98de4d97a88d2cd42a00b7a8f034f Mon Sep 17 00:00:00 2001
From: Yong Li <yong.b.li@linux.intel.com>
Date: Sun, 16 Sep 2018 21:32:38 +0800
Subject: [PATCH] Implement IPMI Commmand - Get Host Restart Cause.

It supports to track the information about what
action last caused the system to restart.
Return value includes: restart_cause and channel_number.

According to IPMI Spec, it includes 12 types as following:
1. Unknown                  0x0
2. IpmiCommand              0x1
3. ResetButton              0x2
4. PowerButton              0x3
5. WatchdogTimer            0x4
6. OEM                      0x5
7. PowerPolicyAlwaysOn      0x6
8. PowerPolicyPreviousState 0x7
9. PEF-Reset                0x8
10. PEF-PowerCycle          0x9
11. SoftReset               0xA
12. RTC-Wakeup              0xB

Change-Id: Id3b32e271b85b5fc4c69d5ca40227f8f9c08ce48
Signed-off-by: Kuiying Wang <kuiying.wang@intel.com>
Signed-off-by: Yong Li <yong.b.li@linux.intel.com>
---
 chassishandler.cpp        | 54 +++++++++++++++++++++++++++++++++++++++
 chassishandler.hpp        |  1 +
 host-ipmid-whitelist.conf |  1 +
 3 files changed, 56 insertions(+)

diff --git a/chassishandler.cpp b/chassishandler.cpp
index d20b220..8a8cb26 100644
--- a/chassishandler.cpp
+++ b/chassishandler.cpp
@@ -90,6 +90,11 @@ static constexpr auto chassisPOHStateIntf =
     "xyz.openbmc_project.State.PowerOnHours";
 static constexpr auto pOHCounterProperty = "POHCounter";
 static constexpr auto match = "chassis0";
+const static constexpr char* stateHostInterface =
+    "xyz.openbmc_project.State.Host";
+const static constexpr char* hostRestartCauseInterface =
+    "xyz.openbmc_project.State.Host.HostRestartCause";
+const static constexpr char* hostRestartCause = "HostRestartCause";
 const static constexpr char chassisCapIntf[] =
     "xyz.openbmc_project.Control.ChassisCapabilities";
 const static constexpr char chassisCapFlagsProp[] = "CapabilitiesFlags";
@@ -176,6 +181,13 @@ struct set_sys_boot_options_t
     uint8_t data[SIZE_BOOT_OPTION];
 } __attribute__((packed));
 
+struct GetSysRestartCauseResponse
+{
+    uint8_t restartCause;
+    uint8_t channelNum;
+
+} __attribute__((packed));
+
 int getHostNetworkData(get_sys_boot_options_response_t* respptr)
 {
     ipmi::PropertyMap properties;
@@ -1584,6 +1596,44 @@ ipmi_ret_t ipmi_chassis_set_sys_boot_options(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
     return rc;
 }
 
+ipmi_ret_t ipmi_chassis_get_sys_restart_cause(
+    ipmi_netfn_t netfn, ipmi_cmd_t cmd, ipmi_request_t request,
+    ipmi_response_t response, ipmi_data_len_t data_len, ipmi_context_t context)
+{
+    ipmi_ret_t rc = IPMI_CC_OK;
+
+    GetSysRestartCauseResponse* resp = (GetSysRestartCauseResponse*)response;
+    std::fill(reinterpret_cast<uint8_t*>(resp),
+              reinterpret_cast<uint8_t*>(resp) + sizeof(*resp), 0);
+    if (*data_len != 0)
+    {
+        rc = IPMI_CC_REQ_DATA_LEN_INVALID;
+        return rc;
+    }
+
+    try
+    {
+        sdbusplus::bus::bus bus{ipmid_get_sd_bus_connection()};
+        ipmi::DbusObjectInfo hostObject =
+            ipmi::getDbusObject(bus, stateHostInterface);
+        ipmi::Value variant =
+            ipmi::getDbusProperty(bus, hostObject.second, hostObject.first,
+                                  hostRestartCauseInterface, hostRestartCause);
+        resp->restartCause = variant.get<uint8_t>();
+    }
+
+    catch (std::exception& e)
+    {
+        log<level::ERR>(e.what());
+        rc = IPMI_CC_UNSPECIFIED_ERROR;
+        return rc;
+    }
+    resp->channelNum = 0; // Fix to primary channel.
+    *data_len = sizeof(GetSysRestartCauseResponse);
+
+    return rc;
+}
+
 /** @brief implements Get POH counter command
  *  @parameter
  *   -  none
@@ -1739,4 +1789,8 @@ void register_netfn_chassis_functions()
                           ipmi::chassis::cmdSetPowerRestorePolicy,
                           ipmi::Privilege::Operator,
                           ipmiChassisSetPowerRestorePolicy);
+
+    // <get Host Restart Cause>
+    ipmi_register_callback(NETFUN_CHASSIS, IPMI_CMD_GET_SYS_RESTART_CAUSE, NULL,
+                           ipmi_chassis_get_sys_restart_cause, PRIVILEGE_USER);
 }
diff --git a/chassishandler.hpp b/chassishandler.hpp
index 49b5ef8..2c42b11 100644
--- a/chassishandler.hpp
+++ b/chassishandler.hpp
@@ -17,6 +17,7 @@ enum ipmi_netfn_chassis_cmds
     // Set Power Restore Policy
     IPMI_CMD_SET_RESTORE_POLICY = 0x06,
     // Get capability bits
+    IPMI_CMD_GET_SYS_RESTART_CAUSE = 0x07,
     IPMI_CMD_SET_SYS_BOOT_OPTIONS = 0x08,
     IPMI_CMD_GET_SYS_BOOT_OPTIONS = 0x09,
     IPMI_CMD_GET_POH_COUNTER = 0x0F,
diff --git a/host-ipmid-whitelist.conf b/host-ipmid-whitelist.conf
index c1fca1d..94232de 100644
--- a/host-ipmid-whitelist.conf
+++ b/host-ipmid-whitelist.conf
@@ -4,6 +4,7 @@
 0x00:0x02    //<Chassis>:<Chassis Control>
 0x00:0x05    //<Chassis>:<Set Chassis Capabilities>
 0x00:0x06    //<Chassis>:<Set Power Restore Policy>
+0x00:0x07    //<Chassis>:<Get System Restart Cause>
 0x00:0x08    //<Chassis>:<Set System Boot Options>
 0x00:0x09    //<Chassis>:<Get System Boot Options>
 0x00:0x0F    //<Chassis>:<Get POH Counter Command>
-- 
2.17.1