linux-kernel - [PATCH 1/4] genirq: Add irq_chip_(startup/shutdown)

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Message-ID: <20250807112326.748740-2-inochiama@gmail.com>
Date: Thu,  7 Aug 2025 19:23:22 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Marc Zyngier <maz@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Inochi Amaoto <inochiama@...il.com>,
	Saurabh Sengar <ssengar@...ux.microsoft.com>,
	Shradha Gupta <shradhagupta@...ux.microsoft.com>,
	Jonathan Cameron <Jonathan.Cameron@...ei.com>,
	Nicolin Chen <nicolinc@...dia.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Chen Wang <unicorn_wang@...look.com>
Cc: linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	Yixun Lan <dlan@...too.org>,
	Longbin Li <looong.bin@...il.com>
Subject: [PATCH 1/4] genirq: Add irq_chip_(startup/shutdown)_parent

Add helper irq_chip_startup_parent and irq_chip_shutdown_parent. The
helper implement the default behavior in case irq_startup or irq_shutdown
is not implemented for the parent interrupt chip, which will fallback
to irq_chip_enable_parent or irq_chip_disable_parent if not available.

Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Inochi Amaoto <inochiama@...il.com>
---
 include/linux/irq.h |  2 ++
 kernel/irq/chip.c   | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 1d6b606a81ef..890e1371f5d4 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -669,6 +669,8 @@ extern int irq_chip_set_parent_state(struct irq_data *data,
 extern int irq_chip_get_parent_state(struct irq_data *data,
 				     enum irqchip_irq_state which,
 				     bool *state);
+extern void irq_chip_shutdown_parent(struct irq_data *data);
+extern unsigned int irq_chip_startup_parent(struct irq_data *data);
 extern void irq_chip_enable_parent(struct irq_data *data);
 extern void irq_chip_disable_parent(struct irq_data *data);
 extern void irq_chip_ack_parent(struct irq_data *data);
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 0d0276378c70..3ffa0d80ddd1 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1259,6 +1259,43 @@ int irq_chip_get_parent_state(struct irq_data *data,
 }
 EXPORT_SYMBOL_GPL(irq_chip_get_parent_state);
 
+/**
+ * irq_chip_shutdown_parent - Shutdown the parent interrupt
+ * @data:	Pointer to interrupt specific data
+ *
+ * Invokes the irq_shutdown() callback of the parent if available or falls
+ * back to irq_chip_disable_parent().
+ */
+void irq_chip_shutdown_parent(struct irq_data *data)
+{
+	struct irq_data *parent = data->parent_data;
+
+	if (parent->chip->irq_shutdown)
+		parent->chip->irq_shutdown(parent);
+	else
+		irq_chip_disable_parent(data);
+}
+EXPORT_SYMBOL_GPL(irq_chip_shutdown_parent);
+
+/**
+ * irq_chip_startup_parent - Startup the parent interrupt
+ * @data:	Pointer to interrupt specific data
+ *
+ * Invokes the irq_startup() callback of the parent if available or falls
+ * back to irq_chip_enable_parent().
+ */
+unsigned int irq_chip_startup_parent(struct irq_data *data)
+{
+	struct irq_data *parent = data->parent_data;
+
+	if (parent->chip->irq_startup)
+		return parent->chip->irq_startup(parent);
+
+	irq_chip_enable_parent(data);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(irq_chip_startup_parent);
+
 /**
  * irq_chip_enable_parent - Enable the parent interrupt (defaults to unmask if
  * NULL)
-- 
2.50.1