genirq/msi: Provide BUS_DEVICE_PCI_MSI[X]

Provide new bus tokens for the upcoming per device PCI/MSI and PCI/MSIX
interrupt domains.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221124232325.917219885@linutronix.de

include/linux/irqdomain_defs.h

@@ -21,6 +21,8 @@ enum irq_domain_bus_token {
 	DOMAIN_BUS_TI_SCI_INTA_MSI,
 	DOMAIN_BUS_WAKEUP,
 	DOMAIN_BUS_VMD_MSI,
+	DOMAIN_BUS_PCI_DEVICE_MSI,
+	DOMAIN_BUS_PCI_DEVICE_MSIX,
 };
 
 #endif /* _LINUX_IRQDOMAIN_DEFS_H */

kernel/irq/msi.c

@@ -1118,6 +1118,8 @@ static bool msi_check_reservation_mode(struct irq_domain *domain,
 
 	switch(domain->bus_token) {
 	case DOMAIN_BUS_PCI_MSI:
+	case DOMAIN_BUS_PCI_DEVICE_MSI:
+	case DOMAIN_BUS_PCI_DEVICE_MSIX:
 	case DOMAIN_BUS_VMD_MSI:
 		break;
 	default:
@@ -1143,6 +1145,8 @@ static int msi_handle_pci_fail(struct irq_domain *domain, struct msi_desc *desc,
 {
 	switch(domain->bus_token) {
 	case DOMAIN_BUS_PCI_MSI:
+	case DOMAIN_BUS_PCI_DEVICE_MSI:
+	case DOMAIN_BUS_PCI_DEVICE_MSIX:
 	case DOMAIN_BUS_VMD_MSI:
 		if (IS_ENABLED(CONFIG_PCI_MSI))
 			break;