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authorThomas Gleixner <tglx@linutronix.de>2014-08-29 14:00:16 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-09-01 13:48:59 +0200
commit9ce7a25849e80cfb264f4995f832b932c1987e1a (patch)
treec7f7301049b93dda90c16b1e8b09e29cdb0bc189 /kernel/irq/internals.h
parentb76f16748fa61801b1a1fd3ffb6f25ee228a35e0 (diff)
downloadlinux-9ce7a25849e80cfb264f4995f832b932c1987e1a.tar.gz
genirq: Simplify wakeup mechanism
Currently we suspend wakeup interrupts by lazy disabling them and check later whether the interrupt has fired, but that's not sufficient for suspend to idle as there is no way to check that once we transitioned into the CPU idle state. So we change the mechanism in the following way: 1) Leave the wakeup interrupts enabled across suspend 2) Add a check to irq_may_run() which is called at the beginning of each flow handler whether the interrupt is an armed wakeup source. This check is basically free as it just extends the existing check for IRQD_IRQ_INPROGRESS. So no new conditional in the hot path. If the IRQD_WAKEUP_ARMED flag is set, then the interrupt is disabled, marked as pending/suspended and the pm core is notified about the wakeup event. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> [ rjw: syscore.c and put irq_pm_check_wakeup() into pm.c ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/irq/internals.h')
-rw-r--r--kernel/irq/internals.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index c402502a5111..4332d766619d 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -196,9 +196,11 @@ static inline void kstat_incr_irqs_this_cpu(unsigned int irq, struct irq_desc *d
}
#ifdef CONFIG_PM_SLEEP
+bool irq_pm_check_wakeup(struct irq_desc *desc);
void irq_pm_install_action(struct irq_desc *desc, struct irqaction *action);
void irq_pm_remove_action(struct irq_desc *desc, struct irqaction *action);
#else
+static inline bool irq_pm_check_wakeup(struct irq_desc *desc) { return false; }
static inline void
irq_pm_install_action(struct irq_desc *desc, struct irqaction *action) { }
static inline void