Merge tag 'irq-core-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq core updates from Thomas Gleixner:
 "A set of updates for the interrupt core subsystem:

   - Introduce irq_chip_[startup|shutdown]_parent() to prepare for
     addressing a few short comings in the PCI/MSI interrupt subsystem.

     It allows to utilize the interrupt chip startup/shutdown callbacks
     for initializing the interrupt chip hierarchy properly on certain
     RISCV implementations and provides a mechanism to reduce the
     overhead of masking and unmasking PCI/MSI interrupts during
     operation when the underlying MSI provider can mask the interrupt.

     The actual usage comes with the interrupt driver pull request.

   - Add generic error handling for devm_request_*_irq()

     This allows to remove the zoo of random error printk's all over the
     usage sites.

   - Add a mechanism to warn about long-running interrupt handlers

     Long running interrupt handlers can introduce latencies and
     tracking them down is a tedious task. The tracking has to be
     enabled with a threshold on the kernel command line and utilizes a
     static branch to remove the overhead when disabled.

   - Update and extend the selftests which validate the CPU hotplug
     interrupt migration logic

   - Allow dropping the per CPU softirq lock on PREEMPT_RT kernels,
     which causes contention and latencies all over the place.

     The serialization requirements have been pushed down into the
     actual affected usage sites already.

   - The usual small cleanups and improvements"

* tag 'irq-core-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT
  softirq: Provide a handshake for canceling tasklets via polling
  genirq/test: Ensure CPU 1 is online for hotplug test
  genirq/test: Drop CONFIG_GENERIC_IRQ_MIGRATION assumptions
  genirq/test: Depend on SPARSE_IRQ
  genirq/test: Fail early if interrupt request fails
  genirq/test: Factor out fake-virq setup
  genirq/test: Select IRQ_DOMAIN
  genirq/test: Fix depth tests on architectures with NOREQUEST by default.
  genirq: Add support for warning on long-running interrupt handlers
  genirq/devres: Add error handling in devm_request_*_irq()
  genirq: Add irq_chip_(startup/shutdown)_parent()
  genirq: Remove GENERIC_IRQ_LEGACY

1 files changed, 37 insertions, 0 deletions

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
@@ -1260,6 +1260,43 @@ 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)
  * @data:	Pointer to interrupt specific data