make DeviceList a singleton and expose the eventFd in Device

Signed-off-by: Niklas Eiling <niklas.eiling@eonerc.rwth-aachen.de>

common/include/villas/kernel/pci.hpp

@@ -107,11 +107,16 @@ protected:
 };
 
 class DeviceList : public std::list<std::shared_ptr<Device>> {
-public:
+private:
   // Initialize Linux PCI handle.
   //
   // This search for all available PCI devices under /sys/bus/pci
   DeviceList();
+  DeviceList &operator=(const DeviceList &);
+  static DeviceList *instance;
+
+public:
+  static DeviceList *getInstance();
 
   DeviceList::value_type lookupDevice(const Slot &s);
 

common/include/villas/kernel/vfio_device.hpp

@@ -60,6 +60,7 @@ public:
   bool pciHotReset();
 
   int getFileDescriptor() const { return fd; }
+  std::vector<int> &getEventfdList() { return eventfdList; }
 
   void dump();
 
@@ -78,6 +79,9 @@ private:
   bool attachedToGroup;
   int groupFd;
 
+  // Interrupt eventfds
+  std::vector<int> eventfdList;
+
   struct vfio_device_info info;
 
   std::vector<struct vfio_irq_info> irqs;

common/lib/kernel/pci.cpp

@@ -25,6 +25,15 @@ using namespace villas::kernel::pci;
 
 #define PCI_BASE_ADDRESS_N(n) (PCI_BASE_ADDRESS_0 + sizeof(uint32_t) * (n))
 
+DeviceList *DeviceList::instance = nullptr;
+
+DeviceList *DeviceList::getInstance() {
+  if (instance == nullptr) {
+    instance = new DeviceList();
+  }
+  return instance;
+};
+
 DeviceList::DeviceList() {
   struct dirent *e;
   DIR *dp;

common/lib/kernel/vfio_device.cpp

@@ -277,6 +277,7 @@ int Device::pciMsiInit(int efds[]) {
       delete[] irqSetBuf;
       return -1;
     }
+    eventfdList.push_back(efds[i]);
   }
 
   memcpy(irqSet->data, efds, sizeof(int) * irqCount);