+NTSTATUS
+NTAPI
+PciQueryInterface(IN PPCI_FDO_EXTENSION DeviceExtension,
+ IN CONST GUID* InterfaceType,
+ IN ULONG Size,
+ IN ULONG Version,
+ IN PVOID InterfaceData,
+ IN PINTERFACE Interface,
+ IN BOOLEAN LastChance)
+{
+ UNICODE_STRING GuidString;
+ NTSTATUS Status;
+ PPCI_INTERFACE *InterfaceList;
+ PPCI_INTERFACE PciInterface;
+ RtlStringFromGUID(InterfaceType, &GuidString);
+ DPRINT1("PCI - PciQueryInterface TYPE = %wZ\n", &GuidString);
+ RtlFreeUnicodeString(&GuidString);
+ DPRINT1(" Size = %d, Version = %d, InterfaceData = %x, LastChance = %s\n",
+ Size,
+ Version,
+ InterfaceData,
+ LastChance ? "TRUE" : "FALSE");
+
+ /* Loop all the available interfaces */
+ for (InterfaceList = LastChance ? PciInterfacesLastResort : PciInterfaces;
+ *InterfaceList;
+ InterfaceList++)
+ {
+ /* Get the current interface */
+ PciInterface = *InterfaceList;
+
+ /* For debugging, construct the GUID string */
+ RtlStringFromGUID(PciInterface->InterfaceType, &GuidString);
+
+ /* Check if this is an FDO or PDO */
+ if (DeviceExtension->ExtensionType == PciFdoExtensionType)
+ {
+ /* Check if the interface is for FDOs */
+ if (!(PciInterface->Flags & PCI_INTERFACE_FDO))
+ {
+ /* This interface is not for FDOs, skip it */
+ DPRINT1("PCI - PciQueryInterface: guid = %wZ only for FDOs\n",
+ &GuidString);
+ RtlFreeUnicodeString(&GuidString);
+ continue;
+ }
+
+ /* Check if the interface is for root FDO only */
+ if ((PciInterface->Flags & PCI_INTERFACE_ROOT) &&
+ (!PCI_IS_ROOT_FDO(DeviceExtension)))
+ {
+ /* This FDO isn't the root, skip the interface */
+ DPRINT1("PCI - PciQueryInterface: guid = %wZ only for ROOT\n",
+ &GuidString);
+ RtlFreeUnicodeString(&GuidString);
+ continue;
+ }
+ }
+ else
+ {
+ /* This is a PDO, check if the interface is for PDOs too */
+ if (!(PciInterface->Flags & PCI_INTERFACE_PDO))
+ {
+ /* It isn't, skip it */
+ DPRINT1("PCI - PciQueryInterface: guid = %wZ only for PDOs\n",
+ &GuidString);
+ RtlFreeUnicodeString(&GuidString);
+ continue;
+ }
+ }
+
+ /* Print the GUID for debugging, and then free the string */
+ DPRINT1("PCI - PciQueryInterface looking at guid = %wZ\n", &GuidString);
+ RtlFreeUnicodeString(&GuidString);
+
+ /* Check if the GUID, version, and size all match */
+ if ((IsEqualGUIDAligned(PciInterface->InterfaceType, InterfaceType)) &&
+ (Version >= PciInterface->MinVersion) &&
+ (Version <= PciInterface->MaxVersion) &&
+ (Size >= PciInterface->MinSize))
+ {
+ /* Call the interface's constructor */
+ Status = PciInterface->Constructor(DeviceExtension,
+ PciInterface,
+ InterfaceData,
+ Version,
+ Size,
+ Interface);
+ if (!NT_SUCCESS(Status))
+ {
+ /* This interface was not initialized correctly, skip it */
+ DPRINT1("PCI - PciQueryInterface - Contructor %08lx = %08lx\n",
+ PciInterface->Constructor, Status);
+ continue;
+ }
+
+ /* Reference the interface and return success, all is good */
+ Interface->InterfaceReference(Interface->Context);
+ DPRINT1("PCI - PciQueryInterface returning SUCCESS\n");
+ return Status;
+ }
+ }
+
+ /* An interface of this type, and for this device, could not be found */
+ DPRINT1("PCI - PciQueryInterface FAILED TO FIND INTERFACE\n");
+ return STATUS_NOT_SUPPORTED;
+}
+
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