--- zzzz-none-000/linux-4.9.279/drivers/pci/msi.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/drivers/pci/msi.c	2023-02-08 11:43:42.000000000 +0000
@@ -1581,3 +1581,25 @@
 	return dom;
 }
 #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
+
+#ifdef CONFIG_INTEL_PCI_MULTI_MSI
+void pci_enable_multi_msi_support(struct pci_dev *dev)
+{
+	dev->mmsi_support = 1;
+	dev_info(&dev->dev, "Multi MSI support enabled\n");
+}
+EXPORT_SYMBOL(pci_enable_multi_msi_support);
+
+void pci_disable_multi_msi_support(struct pci_dev *dev)
+{
+	dev->mmsi_support = 0;
+	dev_info(&dev->dev, "Multi MSI support disabled\n");
+}
+EXPORT_SYMBOL(pci_disable_multi_msi_support);
+
+int pci_multi_msi_support_enabled(struct pci_dev *dev)
+{
+	return dev->mmsi_support;
+}
+EXPORT_SYMBOL(pci_multi_msi_support_enabled);
+#endif /* CONFIG_INTEL_PCI_MULTI_MSI */