PCI: irq: Introduce rearm_wake_irq() (3a79bc63) · Commits · 戴 / test

Introduce a new function, rearm_wake_irq(), allowing a wakeup IRQ to be armed for systen wakeup detection again without running any action handlers associated with it after it has been armed for wakeup detection and triggered. That is useful for IRQs, like ACPI SCI, that may deliver wakeup as well as non-wakeup interrupts when armed for systen wakeup detection. In those cases, it may be possible to determine whether or not the delivered interrupt is a systen wakeup one without running the entire action handler (or handlers, if the IRQ is shared) for the IRQ, and if the interrupt turns out to be a non-wakeup one, the IRQ can be rearmed with the help of the new function. Signed-off-by:

Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by:

Thomas Gleixner <tglx@linutronix.de>

include/linux/interrupt.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -238,6 +238,7 @@ extern void teardown_percpu_nmi(unsigned int irq);
		/* The following three functions are for the core kernel use only. */
		extern void suspend_device_irqs(void);
		extern void resume_device_irqs(void);
		extern void rearm_wake_irq(unsigned int irq);

		/**
		* struct irq_affinity_notify - context for notification of IRQ affinity changes

kernel/irq/pm.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -176,6 +176,26 @@ static void resume_irqs(bool want_early)
		}
		}

		/**
		* rearm_wake_irq - rearm a wakeup interrupt line after signaling wakeup
		* @irq: Interrupt to rearm
		*/
		void rearm_wake_irq(unsigned int irq)
		{
		unsigned long flags;
		struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);

		if (!desc \|\| !(desc->istate & IRQS_SUSPENDED) \|\|
		!irqd_is_wakeup_set(&desc->irq_data))
		return;

		desc->istate &= ~IRQS_SUSPENDED;
		irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
		__enable_irq(desc);

		irq_put_desc_busunlock(desc, flags);
		}

		/**
		* irq_pm_syscore_ops - enable interrupt lines early
		*

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