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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
parentb76f16748fa61801b1a1fd3ffb6f25ee228a35e0 (diff)
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')
-rw-r--r--kernel/irq/chip.c20
-rw-r--r--kernel/irq/internals.h2
-rw-r--r--kernel/irq/pm.c55
3 files changed, 50 insertions, 27 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 6baf8608557..e7917ff8a48 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -344,8 +344,26 @@ static bool irq_check_poll(struct irq_desc *desc)
static bool irq_may_run(struct irq_desc *desc)
{
- if (!irqd_irq_inprogress(&desc->irq_data))
+ unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
+
+ /*
+ * If the interrupt is not in progress and is not an armed
+ * wakeup interrupt, proceed.
+ */
+ if (!irqd_has_set(&desc->irq_data, mask))
return true;
+
+ /*
+ * If the interrupt is an armed wakeup source, mark it pending
+ * and suspended, disable it and notify the pm core about the
+ * event.
+ */
+ if (irq_pm_check_wakeup(desc))
+ return false;
+
+ /*
+ * Handle a potential concurrent poll on a different core.
+ */
return irq_check_poll(desc);
}
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index c402502a511..4332d766619 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
diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
index 766930eaeed..3ca53259270 100644
--- a/kernel/irq/pm.c
+++ b/kernel/irq/pm.c
@@ -9,10 +9,24 @@
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/interrupt.h>
+#include <linux/suspend.h>
#include <linux/syscore_ops.h>
#include "internals.h"
+bool irq_pm_check_wakeup(struct irq_desc *desc)
+{
+ if (irqd_is_wakeup_armed(&desc->irq_data)) {
+ irqd_clear(&desc->irq_data, IRQD_WAKEUP_ARMED);
+ desc->istate |= IRQS_SUSPENDED | IRQS_PENDING;
+ desc->depth++;
+ irq_disable(desc);
+ pm_system_wakeup();
+ return true;
+ }
+ return false;
+}
+
/*
* Called from __setup_irq() with desc->lock held after @action has
* been installed in the action chain.
@@ -54,8 +68,16 @@ static bool suspend_device_irq(struct irq_desc *desc, int irq)
if (!desc->action || desc->no_suspend_depth)
return false;
- if (irqd_is_wakeup_set(&desc->irq_data))
+ if (irqd_is_wakeup_set(&desc->irq_data)) {
irqd_set(&desc->irq_data, IRQD_WAKEUP_ARMED);
+ /*
+ * We return true here to force the caller to issue
+ * synchronize_irq(). We need to make sure that the
+ * IRQD_WAKEUP_ARMED is visible before we return from
+ * suspend_device_irqs().
+ */
+ return true;
+ }
desc->istate |= IRQS_SUSPENDED;
__disable_irq(desc, irq);
@@ -79,9 +101,13 @@ static bool suspend_device_irq(struct irq_desc *desc, int irq)
* for this purpose.
*
* So we disable all interrupts and mark them IRQS_SUSPENDED except
- * for those which are unused and those which are marked as not
+ * for those which are unused, those which are marked as not
* suspendable via an interrupt request with the flag IRQF_NO_SUSPEND
- * set.
+ * set and those which are marked as active wakeup sources.
+ *
+ * The active wakeup sources are handled by the flow handler entry
+ * code which checks for the IRQD_WAKEUP_ARMED flag, suspends the
+ * interrupt and notifies the pm core about the wakeup.
*/
void suspend_device_irqs(void)
{
@@ -173,26 +199,3 @@ void resume_device_irqs(void)
resume_irqs(false);
}
EXPORT_SYMBOL_GPL(resume_device_irqs);
-
-/**
- * check_wakeup_irqs - check if any wake-up interrupts are pending
- */
-int check_wakeup_irqs(void)
-{
- struct irq_desc *desc;
- int irq;
-
- for_each_irq_desc(irq, desc) {
- /*
- * Only interrupts which are marked as wakeup source
- * and have not been disabled before the suspend check
- * can abort suspend.
- */
- if (irqd_is_wakeup_set(&desc->irq_data)) {
- if (desc->depth == 1 && desc->istate & IRQS_PENDING)
- return -EBUSY;
- }
- }
-
- return 0;
-}