linux-kernel - [PATCH not for merging 3/7] irqdomain: Add parent field to irqchip

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20251028-gicv5-host-acpi-v1-3-01a862feb5ca@kernel.org>
Date: Tue, 28 Oct 2025 11:19:01 +0100
From: Lorenzo Pieralisi <lpieralisi@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, 
 Robert Moore <robert.moore@...el.com>, Thomas Gleixner <tglx@...utronix.de>, 
 Hanjun Guo <guohanjun@...wei.com>, Sudeep Holla <sudeep.holla@....com>, 
 Marc Zyngier <maz@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-acpi@...r.kernel.org, acpica-devel@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-pci@...r.kernel.org, Lorenzo Pieralisi <lpieralisi@...nel.org>
Subject: [PATCH not for merging 3/7] irqdomain: Add parent field to
 irqchip_fwid

The GICv5 driver IRQ domain hierarchy requires adding a parent field to
struct irqchip_fwid so that core code can reference a fwnode_handle parent
for a given fwnode.

Add a parent field to struct irqchip_fwid and update the related kernel API
functions to initialize and handle it.

Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Marc Zyngier <maz@...nel.org>
---
 include/linux/irqdomain.h | 30 ++++++++++++++++++++++++++----
 kernel/irq/irqdomain.c    | 14 +++++++++++++-
 2 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 4a86e6b915dd..289a390ccbe6 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -236,7 +236,8 @@ static inline void irq_domain_set_pm_device(struct irq_domain *d, struct device
 
 #ifdef CONFIG_IRQ_DOMAIN
 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
-						const char *name, phys_addr_t *pa);
+						const char *name, phys_addr_t *pa,
+						struct fwnode_handle *parent);
 
 enum {
 	IRQCHIP_FWNODE_REAL,
@@ -246,18 +247,39 @@ enum {
 
 static inline struct fwnode_handle *irq_domain_alloc_named_fwnode(const char *name)
 {
-	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED, 0, name, NULL);
+	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED, 0, name, NULL, NULL);
+}
+
+static inline
+struct fwnode_handle *irq_domain_alloc_named_fwnode_parent(const char *name,
+							   struct fwnode_handle *parent)
+{
+	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED, 0, name, NULL, parent);
 }
 
 static inline struct fwnode_handle *irq_domain_alloc_named_id_fwnode(const char *name, int id)
 {
 	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED_ID, id, name,
-					 NULL);
+					 NULL, NULL);
+}
+
+static inline
+struct fwnode_handle *irq_domain_alloc_named_id_fwnode_parent(const char *name, int id,
+							      struct fwnode_handle *parent)
+{
+	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED_ID, id, name,
+					 NULL, parent);
 }
 
 static inline struct fwnode_handle *irq_domain_alloc_fwnode(phys_addr_t *pa)
 {
-	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_REAL, 0, NULL, pa);
+	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_REAL, 0, NULL, pa, NULL);
+}
+
+static inline struct fwnode_handle *irq_domain_alloc_fwnode_parent(phys_addr_t *pa,
+								   struct fwnode_handle *parent)
+{
+	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_REAL, 0, NULL, pa, parent);
 }
 
 void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index dc473faadcc8..a6e159785cc2 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -33,6 +33,7 @@ static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq
 
 struct irqchip_fwid {
 	struct fwnode_handle	fwnode;
+	struct fwnode_handle	*parent;
 	unsigned int		type;
 	char			*name;
 	phys_addr_t		*pa;
@@ -53,8 +54,16 @@ static const char *irqchip_fwnode_get_name(const struct fwnode_handle *fwnode)
 	return fwid->name;
 }
 
+static struct fwnode_handle *irqchip_fwnode_get_parent(const struct fwnode_handle *fwnode)
+{
+	struct irqchip_fwid *fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
+
+	return fwid->parent;
+}
+
 const struct fwnode_operations irqchip_fwnode_ops = {
 	.get_name = irqchip_fwnode_get_name,
+	.get_parent = irqchip_fwnode_get_parent,
 };
 EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
 
@@ -65,6 +74,7 @@ EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
  * @id:		Optional user provided id if name != NULL
  * @name:	Optional user provided domain name
  * @pa:		Optional user-provided physical address
+ * @parent:	Optional parent fwnode_handle
  *
  * Allocate a struct irqchip_fwid, and return a pointer to the embedded
  * fwnode_handle (or NULL on failure).
@@ -76,7 +86,8 @@ EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
  */
 struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
 						const char *name,
-						phys_addr_t *pa)
+						phys_addr_t *pa,
+						struct fwnode_handle *parent)
 {
 	struct irqchip_fwid *fwid;
 	char *n;
@@ -104,6 +115,7 @@ struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
 	fwid->type = type;
 	fwid->name = n;
 	fwid->pa = pa;
+	fwid->parent = parent;
 	fwnode_init(&fwid->fwnode, &irqchip_fwnode_ops);
 	return &fwid->fwnode;
 }

-- 
2.50.1