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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-07-15 13:03:20 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-07-23 09:37:51 +0200
commit3a79bc63d90750f737ab9d7219bd3091d2fd6d84 (patch)
tree57aee43684c7c9c83eff53b6e8ea765975ab5b55 /kernel/irq
parent5f9e832c137075045d15cd6899ab0505cfb2ca4b (diff)
downloadlinux-3a79bc63d90750f737ab9d7219bd3091d2fd6d84.tar.bz2
PCI: irq: Introduce rearm_wake_irq()
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>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/pm.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
index d6961d3c6f9e..8f557fa1f4fe 100644
--- a/kernel/irq/pm.c
+++ b/kernel/irq/pm.c
@@ -177,6 +177,26 @@ 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
*
* Enable all interrupt lines with %IRQF_EARLY_RESUME set.