irqchip/gic: Convert to msi_create_parent_irq_domain() helper

JIRA: https://issues.redhat.com/browse/RHEL-120705
Upstream Status: c6b7782

commit c6b7782
Author: Marc Zyngier <maz@kernel.org>
Date:   Tue May 13 18:28:13 2025 +0100

    irqchip/gic: Convert to msi_create_parent_irq_domain() helper

    Switch the GIC family of interrupt chip drivers over to the common helper
    function to create the interrupt domains.

    [ tglx: Moved the struct out of the function call argument ]

    Signed-off-by: Marc Zyngier <maz@kernel.org>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Link: https://lore.kernel.org/all/20250513172819.2216709-4-maz@kernel.org

Signed-off-by: Myron Stowe <mstowe@redhat.com>

Author: Myron Stowe

drivers/irqchip/irq-gic-v2m.c

@@ -261,23 +261,23 @@ static struct msi_parent_ops gicv2m_msi_parent_ops = {
 
 static __init int gicv2m_allocate_domains(struct irq_domain *parent)
 {
-	struct irq_domain *inner_domain;
+	struct irq_domain_info info = {
+		.ops		= &gicv2m_domain_ops,
+		.parent		= parent,
+	};
 	struct v2m_data *v2m;
 
 	v2m = list_first_entry_or_null(&v2m_nodes, struct v2m_data, entry);
 	if (!v2m)
 		return 0;
 
-	inner_domain = irq_domain_create_hierarchy(parent, 0, 0, v2m->fwnode,
-						   &gicv2m_domain_ops, v2m);
-	if (!inner_domain) {
+	info.host_data = v2m;
+	info.fwnode = v2m->fwnode;
+
+	if (!msi_create_parent_irq_domain(&info, &gicv2m_msi_parent_ops)) {
 		pr_err("Failed to create GICv2m domain\n");
 		return -ENOMEM;
 	}
-
-	irq_domain_update_bus_token(inner_domain, DOMAIN_BUS_NEXUS);
-	inner_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
-	inner_domain->msi_parent_ops = &gicv2m_msi_parent_ops;
 	return 0;
 }
 

drivers/irqchip/irq-gic-v3-its.c

@@ -5101,7 +5101,12 @@ static void __init __iomem *its_map_one(struct resource *res, int *err)
 
 static int its_init_domain(struct its_node *its)
 {
-	struct irq_domain *inner_domain;
+	struct irq_domain_info dom_info = {
+		.fwnode		= its->fwnode_handle,
+		.ops		= &its_domain_ops,
+		.domain_flags	= its->msi_domain_flags,
+		.parent		= its_parent,
+	};
 	struct msi_domain_info *info;
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
@@ -5110,21 +5115,12 @@ static int its_init_domain(struct its_node *its)
 
 	info->ops = &its_msi_domain_ops;
 	info->data = its;
+	dom_info.host_data = info;
 
-	inner_domain = irq_domain_create_hierarchy(its_parent,
-						   its->msi_domain_flags, 0,
-						   its->fwnode_handle, &its_domain_ops,
-						   info);
-	if (!inner_domain) {
+	if (!msi_create_parent_irq_domain(&dom_info, &gic_v3_its_msi_parent_ops)) {
 		kfree(info);
 		return -ENOMEM;
 	}
-
-	irq_domain_update_bus_token(inner_domain, DOMAIN_BUS_NEXUS);
-
-	inner_domain->msi_parent_ops = &gic_v3_its_msi_parent_ops;
-	inner_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT | IRQ_DOMAIN_FLAG_MSI_IMMUTABLE;
-
 	return 0;
 }
 
@@ -5501,7 +5497,7 @@ static struct its_node __init *its_node_init(struct resource *res,
 	its->base = its_base;
 	its->phys_base = res->start;
 	its->get_msi_base = its_irq_get_msi_base;
-	its->msi_domain_flags = IRQ_DOMAIN_FLAG_ISOLATED_MSI;
+	its->msi_domain_flags = IRQ_DOMAIN_FLAG_ISOLATED_MSI | IRQ_DOMAIN_FLAG_MSI_IMMUTABLE;
 
 	its->numa_node = numa_node;
 	its->fwnode_handle = handle;

drivers/irqchip/irq-gic-v3-mbi.c

@@ -206,17 +206,13 @@ static const struct msi_parent_ops gic_v3_mbi_msi_parent_ops = {
 
 static int mbi_allocate_domain(struct irq_domain *parent)
 {
-	struct irq_domain *nexus_domain;
+	struct irq_domain_info info = {
+		.fwnode		= parent->fwnode,
+		.ops		= &mbi_domain_ops,
+		.parent		= parent,
+	};
 
-	nexus_domain = irq_domain_create_hierarchy(parent, 0, 0, parent->fwnode,
-						   &mbi_domain_ops, NULL);
-	if (!nexus_domain)
-		return -ENOMEM;
-
-	irq_domain_update_bus_token(nexus_domain, DOMAIN_BUS_NEXUS);
-	nexus_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
-	nexus_domain->msi_parent_ops = &gic_v3_mbi_msi_parent_ops;
-	return 0;
+	return msi_create_parent_irq_domain(&info, &gic_v3_mbi_msi_parent_ops) ? 0 : -ENOMEM;
 }
 
 int __init mbi_init(struct fwnode_handle *fwnode, struct irq_domain *parent)