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From ee182e17b21b99dae7e1a57759558530f9081d78 Mon Sep 17 00:00:00 2001
From: Zhikui Ren <zhikui.ren@intel.com>
Date: Wed, 10 Feb 2021 13:26:57 -0800
Subject: [PATCH] save current power state in tmp file
host power state is captured in dbus object properties.
But dbus latency can be many seconds or longer at times.
which is not meeting the realtime requirement for some
application like sensors.
Capture current power state in a temp file as a way to share
the power state in realtime with other applications.
Tested:
1. ipmitool power on
cat /tmp/host-state
xyz.openbmc_project.State.Host.HostState.Running
2. ipmitool power off
cat /tmp/host-state
xyz.openbmc_project.State.Host.HostState.Off
3. AC cycle with DC on and DC off
tmp file created correctly
4. Reset BMC with DC on and DC off
tmp file created correctly
5. After FW update and BMC restart
tmp file created correctly
Signed-off-by: Zhikui Ren <zhikui.ren@intel.com>
---
power-control-x86/src/power_control.cpp | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/power-control-x86/src/power_control.cpp b/power-control-x86/src/power_control.cpp
index bddb16e..9dc08ba 100644
--- a/power-control-x86/src/power_control.cpp
+++ b/power-control-x86/src/power_control.cpp
@@ -62,6 +62,8 @@ const static constexpr int powerOffSaveTimeMs = 7000;
const static std::filesystem::path powerControlDir = "/var/lib/power-control";
const static constexpr std::string_view powerStateFile = "power-state";
+const static std::filesystem::path tmpHostStateFileDir = "/tmp";
+const static constexpr std::string_view hostStateFile = "host-state";
static bool nmiEnabled = true;
static constexpr const char* nmiOutName = "NMI_OUT";
@@ -453,6 +455,11 @@ static void setPowerState(const PowerState state)
std::string(getChassisState(powerState)));
chassisIface->set_property("LastStateChangeTime", getCurrentTimeMs());
+ // dbus latency can be unpredictable sometime
+ // tmp file is used to share current power state
+ std::ofstream tmpHostStateStream(tmpHostStateFileDir / hostStateFile);
+ tmpHostStateStream << getHostState(state);
+
// Save the power state for the restore policy
savePowerState(state);
}
@@ -628,6 +635,13 @@ static void nmiDiagIntLog()
static int initializePowerStateStorage()
{
+ // Create tmp power state file if it doesn't exist
+ if (!std::filesystem::exists(tmpHostStateFileDir / hostStateFile))
+ {
+ std::ofstream tmpHostStateStream(tmpHostStateFileDir / hostStateFile);
+ tmpHostStateStream << getHostState(powerState);
+ }
+
// create the power control directory if it doesn't exist
std::error_code ec;
if (!(std::filesystem::create_directories(powerControlDir, ec)))
@@ -639,6 +653,7 @@ static int initializePowerStateStorage()
return -1;
}
}
+
// Create the power state file if it doesn't exist
if (!std::filesystem::exists(powerControlDir / powerStateFile))
{
--
2.17.1
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