gpu_fdinfo: add gpu clock support for i915

Author: 17314642

src/gpu_fdinfo.cpp

@@ -244,6 +244,55 @@ int GPU_fdinfo::get_gpu_load()
     return result;
 }
 
+void GPU_fdinfo::find_intel_gt_dir()
+{
+    std::string device = "/sys/bus/pci/devices/" + pci_dev + "/drm";
+
+    auto dir_iterator = fs::directory_iterator(device);
+
+    // Find first dir which starts with name "card"
+    for (const auto& entry : fs::directory_iterator(device)) {
+        auto path = entry.path().string();
+        if (path.substr(device.size() + 1, 4) == "card") {
+            device = path;
+            break;
+        }
+    }
+
+    device += "/gt_cur_freq_mhz";
+
+    if (!fs::exists(device)) {
+        SPDLOG_WARN(
+            "Intel gt file ({}) not found. GPU clock will not be available.",
+            device
+        );
+        return;
+    }
+
+    gpu_clock_stream.open(device);
+
+    if (!gpu_clock_stream.good())
+        SPDLOG_WARN("Intel gt dir: failed to open {}", device);
+}
+
+int GPU_fdinfo::get_gpu_clock()
+{
+    // Only i915 currently supported
+    if (module != "i915" || !gpu_clock_stream.is_open())
+        return 0;
+
+    std::string clock_str;
+
+    gpu_clock_stream.seekg(0);
+
+    std::getline(gpu_clock_stream, clock_str);
+
+    if (clock_str.empty())
+        return 0;
+
+    return std::stoi(clock_str);
+}
+
 void GPU_fdinfo::main_thread()
 {
     while (!stop_thread) {
@@ -255,6 +304,7 @@ void GPU_fdinfo::main_thread()
         metrics.load = get_gpu_load();
         metrics.memoryUsed = get_memory_used();
         metrics.powerUsage = get_power_usage();
+        metrics.CoreClock = get_gpu_clock();
 
         SPDLOG_DEBUG(
             "pci_dev = {}, pid = {}, module = {}, load = {}, mem = {}, power = {}",

src/gpu_fdinfo.h

@@ -14,7 +14,6 @@
 #include <spdlog/spdlog.h>
 #include <map>
 #include <set>
-#include <unistd.h>
 
 class GPU_fdinfo {
 private:
@@ -46,7 +45,6 @@ class GPU_fdinfo {
 
     void find_fd();
     void open_fdinfo_fd(std::string path);
-    void find_intel_hwmon();
 
     int get_gpu_load();
     uint64_t get_gpu_time();
@@ -58,10 +56,15 @@ class GPU_fdinfo {
 
     float get_memory_used();
 
+    void find_intel_hwmon();
     float get_current_power();
     float get_power_usage();
     float last_power = 0;
 
+    std::ifstream gpu_clock_stream;
+    void find_intel_gt_dir();
+    int get_gpu_clock();
+
 public:
     GPU_fdinfo(const std::string module, const std::string pci_dev)
         : module(module)
@@ -105,6 +108,9 @@ class GPU_fdinfo {
         if (module == "i915" || module == "xe")
             find_intel_hwmon();
 
+        if (module == "i915")
+            find_intel_gt_dir();
+
         std::thread thread(&GPU_fdinfo::main_thread, this);
         thread.detach();
     }