gpu_fdinfo: determine if i915 or xe driver is used

Author: 17314642

src/gpu.cpp

@@ -72,6 +72,26 @@ GPUS::GPUS(overlay_params* params) : params(params) {
     find_active_gpu();
 }
 
+std::string GPU::is_i915_or_xe() {
+    std::string path = "/sys/bus/pci/devices/";
+    path += pci_dev + "/driver";
+
+    if (!fs::exists(path)) {
+        SPDLOG_ERROR("{} doesn't exist", path);
+        return "";
+    }
+
+    if (!fs::is_symlink(path)) {
+        SPDLOG_ERROR("{} is not a symlink (it should be)", path);
+        return "";
+    }
+
+    std::string driver = fs::read_symlink(path);
+    driver = driver.substr(driver.rfind("/") + 1);
+
+    return driver;
+}
+
 std::string GPUS::get_pci_device_address(const std::string& drm_card_path) {
     // Resolve the symbolic link to get the actual device path
     fs::path device_path = fs::canonical(fs::path(drm_card_path) / "device");

src/gpu.h

@@ -17,6 +17,9 @@
 #include "gpu_fdinfo.h"
 
 class GPU {
+    private:
+        std::string is_i915_or_xe();
+
     public:
         gpu_metrics metrics;
         std::string name;
@@ -38,7 +41,7 @@ class GPU {
                 // For now we're only accepting one of these modules at once
                 // Might be possible that multiple can exist on a system in the future?
                 if (vendor_id == 0x8086)
-                    fdinfo = std::make_unique<GPU_fdinfo>("i915", pci_dev);
+                    fdinfo = std::make_unique<GPU_fdinfo>(is_i915_or_xe(), pci_dev);
 
                 if (vendor_id == 0x5143)
                     fdinfo = std::make_unique<GPU_fdinfo>("msm", pci_dev);