v4.19.13 snapshot.
diff --git a/include/linux/pci-aspm.h b/include/linux/pci-aspm.h
new file mode 100644
index 0000000..df28af5
--- /dev/null
+++ b/include/linux/pci-aspm.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * aspm.h
+ *
+ * PCI Express ASPM defines and function prototypes
+ *
+ * Copyright (C) 2007 Intel Corp.
+ * Zhang Yanmin (yanmin.zhang@intel.com)
+ * Shaohua Li (shaohua.li@intel.com)
+ *
+ * For more information, please consult the following manuals (look at
+ * http://www.pcisig.com/ for how to get them):
+ *
+ * PCI Express Specification
+ */
+
+#ifndef LINUX_ASPM_H
+#define LINUX_ASPM_H
+
+#include <linux/pci.h>
+
+#define PCIE_LINK_STATE_L0S 1
+#define PCIE_LINK_STATE_L1 2
+#define PCIE_LINK_STATE_CLKPM 4
+
+#ifdef CONFIG_PCIEASPM
+void pci_disable_link_state(struct pci_dev *pdev, int state);
+void pci_disable_link_state_locked(struct pci_dev *pdev, int state);
+void pcie_no_aspm(void);
+#else
+static inline void pci_disable_link_state(struct pci_dev *pdev, int state) { }
+static inline void pcie_no_aspm(void) { }
+#endif
+
+#endif /* LINUX_ASPM_H */