[v0.21] Print GPU list even when no valid GPU is detected, to improve user understanding

src/common/main.cpp

@@ -75,7 +75,8 @@ int main(int argc, char* argv[]) {
   }
 
   if(get_num_gpus_available(list) == 0) {
-    printErr("No GPU was detected, or the detected GPU is not supported by gpufetch");
+    printErr("No GPU was detected! Available GPUs are:");
+    print_gpus_list_pci();
     printf("Please, make sure that the appropiate backend is enabled:\n");
     print_enabled_backends();
     printf("Visit https://github.com/Dr-Noob/gpufetch#2-backends for more information\n");

src/common/pci.cpp

@@ -1,7 +1,13 @@
 #include "global.hpp"
 #include "pci.hpp"
+#include "../cuda/pci.hpp"
+#include "../intel/pci.hpp"
+
+#include <cstdio>
 #include <cstddef>
 
+// TODO: Move AMD PCI id when possible
+#define PCI_VENDOR_ID_AMD    0x1002
 #define CLASS_VGA_CONTROLLER 0x0300
 
 bool pciutils_is_vendor_id_present(struct pci_dev *devices, int id) {
@@ -71,3 +77,24 @@ struct pci_dev *get_pci_devices_from_pciutils() {
 
   return pacc->devices;
 }
+
+void print_gpus_list_pci() {
+  int i=0;
+  struct pci_dev *devices = get_pci_devices_from_pciutils();
+
+  for(struct pci_dev *dev=devices; dev != NULL; dev=dev->next) {
+   if(dev->device_class == CLASS_VGA_CONTROLLER) {
+      printf("- GPU %d: ", i);
+      if(dev->vendor_id == PCI_VENDOR_ID_NVIDIA) {
+        printf("NVIDIA ");
+      }
+      else if(dev->vendor_id == PCI_VENDOR_ID_INTEL) {
+        printf("Intel ");
+      }
+      else if(dev->vendor_id == PCI_VENDOR_ID_AMD) {
+        printf("AMD ");
+      }
+      printf("%.4x:%.4x\n", dev->vendor_id, dev->device_id);
+    }
+  }
+}

src/common/pci.hpp

@@ -17,5 +17,6 @@ struct pci {
 
 struct pci* get_pci_from_pciutils(struct pci_dev *devices, int id);
 struct pci_dev *get_pci_devices_from_pciutils();
+void print_gpus_list_pci();
 
 #endif