genirq/msi: Add bus token to struct msi_domain_info

Add a bus token member to struct msi_domain_info and let
msi_create_irq_domain() set the bus token.

That allows to remove the bus token updates at the call sites.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20221111122014.294554462@linutronix.de

include/linux/msi.h

@@ -16,6 +16,7 @@
  * abuse. The only function which is relevant for drivers is msi_get_virq().
  */
 
+#include <linux/irqdomain_defs.h>
 #include <linux/cpumask.h>
 #include <linux/xarray.h>
 #include <linux/mutex.h>
@@ -365,6 +366,7 @@ struct msi_domain_ops {
 /**
  * struct msi_domain_info - MSI interrupt domain data
  * @flags:		Flags to decribe features and capabilities
+ * @bus_token:		The domain bus token
  * @ops:		The callback data structure
  * @chip:		Optional: associated interrupt chip
  * @chip_data:		Optional: associated interrupt chip data
@@ -375,6 +377,7 @@ struct msi_domain_ops {
  */
 struct msi_domain_info {
 	u32				flags;
+	enum irq_domain_bus_token	bus_token;
 	struct msi_domain_ops		*ops;
 	struct irq_chip			*chip;
 	void				*chip_data;

kernel/irq/msi.c

@@ -694,8 +694,11 @@ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
 	domain = irq_domain_create_hierarchy(parent, IRQ_DOMAIN_FLAG_MSI, 0,
 					     fwnode, &msi_domain_ops, info);
 
-	if (domain && !domain->name && info->chip)
+	if (domain) {
+		if (!domain->name && info->chip)
 			domain->name = info->chip->name;
+		irq_domain_update_bus_token(domain, info->bus_token);
+	}
 
 	return domain;
 }