diff --git a/sys/compat/linuxkpi/common/include/linux/pci.h b/sys/compat/linuxkpi/common/include/linux/pci.h
--- a/sys/compat/linuxkpi/common/include/linux/pci.h
+++ b/sys/compat/linuxkpi/common/include/linux/pci.h
@@ -161,6 +161,11 @@
 #define	PCI_EXP_LNKCTL2_ENTER_COMP	0x0010	/* Enter Compliance */
 #define	PCI_EXP_LNKCTL2_TX_MARGIN	0x0380	/* Transmit Margin */
 
+#define	PCI_MSI_ADDRESS_LO	PCIR_MSI_ADDR
+#define	PCI_MSI_ADDRESS_HI	PCIR_MSI_ADDR_HIGH
+#define	PCI_MSI_FLAGS		PCIR_MSI_CTRL
+#define	PCI_MSI_FLAGS_ENABLE	PCIM_MSICTRL_MSI_ENABLE
+
 #define PCI_EXP_LNKCAP_CLKPM	0x00040000
 #define PCI_EXP_DEVSTA_TRPND	0x0020
 
@@ -1608,4 +1613,12 @@
 	return (128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12));
 }
 
+static inline bool
+pci_is_enabled(struct pci_dev *pdev)
+{
+
+	return ((pci_read_config(pdev->dev.bsddev, PCIR_COMMAND, 2) &
+	    PCIM_CMD_BUSMASTEREN) != 0);
+}
+
 #endif	/* _LINUXKPI_LINUX_PCI_H_ */