commit 902c649b631ada141ee5910f7ee2a45026d5b084
author Harshit Aghera <haghera@nvidia.com> Thu May 08 15:57:42 2025 +0530
committer Ed Tanous <ed@tanous.net> Thu Jul 10 15:01:22 2025 +0000
tree aa5fcb68fbd3b0cbaa298440ec9cd04b708d5376
parent 5e7deccd14dcac790028a6641291cc019c1c4e52

nvidia-gpu: add power sensor

This patch adds support to fetch power sensor value from gpu

Tested: Build an image for gb200nvl-obmc machine with the following
patches cherry picked. This patches are needed to enable the mctp stack.

https://gerrit.openbmc.org/c/openbmc/openbmc/+/79422

```
$ curl -s -k -u 'root:0penBmc' https://10.137.203.137/redfish/v1/Chassis/NVIDIA_GB200_1/Sensors/power_NVIDIA_GB200_GPU_0_Power_0
{
  "@odata.id": "/redfish/v1/Chassis/NVIDIA_GB200_1/Sensors/power_NVIDIA_GB200_GPU_0_Power_0",
  "@odata.type": "#Sensor.v1_2_0.Sensor",
  "Id": "power_NVIDIA_GB200_GPU_0_Power_0",
  "Name": "NVIDIA GB200 GPU 0 Power 0",
  "Reading": 27.181,
  "ReadingRangeMax": 4294967.295,
  "ReadingRangeMin": 0.0,
  "ReadingType": "Power",
  "ReadingUnits": "W",
  "Status": {
    "Health": "OK",
    "State": "Enabled"
  }
}%
```

Change-Id: Ic227a0056daa68ab2239a609ed20c7ed2f6bd2c5
Signed-off-by: Harshit Aghera <haghera@nvidia.com>

src/nvidia-gpu/NvidiaGpuDevice.cpp

diff --git a/src/nvidia-gpu/NvidiaGpuDevice.cpp b/src/nvidia-gpu/NvidiaGpuDevice.cpp
index 509a353..dc30788 100644
--- a/src/nvidia-gpu/NvidiaGpuDevice.cpp
+++ b/src/nvidia-gpu/NvidiaGpuDevice.cpp
@@ -14,6 +14,7 @@
 #include <bits/basic_string.h>
 
 #include <MctpRequester.hpp>
+#include <NvidiaGpuPowerSensor.hpp>
 #include <NvidiaGpuThresholds.hpp>
 #include <boost/asio/io_context.hpp>
 #include <phosphor-logging/lg2.hpp>
@@ -56,6 +57,10 @@
         mctpRequester,
         std::bind_front(&GpuDevice::processTLimitThresholds, this));
 
+    powerSensor = std::make_shared<NvidiaGpuPowerSensor>(
+        conn, mctpRequester, name + "_Power_0", path, eid, gpuPowerSensorId,
+        objectServer, std::vector<thresholds::Threshold>{});
+
     lg2::info("Added GPU {NAME} Sensors with chassis path: {PATH}.", "NAME",
               name, "PATH", path);
 
@@ -92,6 +97,7 @@
     {
         tLimitSensor->update();
     }
+    powerSensor->update();
 
     waitTimer.expires_after(std::chrono::milliseconds(sensorPollMs));
     waitTimer.async_wait([this](const boost::system::error_code& ec) {