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-rw-r--r--drivers/base/syscore.c7
-rw-r--r--include/linux/interrupt.h5
-rw-r--r--kernel/irq/chip.c20
-rw-r--r--kernel/irq/internals.h2
-rw-r--r--kernel/irq/pm.c55
5 files changed, 53 insertions, 36 deletions
diff --git a/drivers/base/syscore.c b/drivers/base/syscore.c
index dbb8350..8d98a32 100644
--- a/drivers/base/syscore.c
+++ b/drivers/base/syscore.c
@@ -9,7 +9,7 @@
#include <linux/syscore_ops.h>
#include <linux/mutex.h>
#include <linux/module.h>
-#include <linux/interrupt.h>
+#include <linux/suspend.h>
#include <trace/events/power.h>
static LIST_HEAD(syscore_ops_list);
@@ -54,9 +54,8 @@ int syscore_suspend(void)
pr_debug("Checking wakeup interrupts\n");
/* Return error code if there are any wakeup interrupts pending. */
- ret = check_wakeup_irqs();
- if (ret)
- return ret;
+ if (pm_wakeup_pending())
+ return -EBUSY;
WARN_ONCE(!irqs_disabled(),
"Interrupts enabled before system core suspend.\n");
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 698ad05..69517a2 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -193,11 +193,6 @@ extern void irq_wake_thread(unsigned int irq, void *dev_id);
/* The following three functions are for the core kernel use only. */
extern void suspend_device_irqs(void);
extern void resume_device_irqs(void);
-#ifdef CONFIG_PM_SLEEP
-extern int check_wakeup_irqs(void);
-#else
-static inline int check_wakeup_irqs(void) { return 0; }
-#endif
/**
* struct irq_affinity_notify - context for notification of IRQ affinity changes
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 6baf860..e7917ff 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 c402502..4332d76 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 766930e..3ca5325 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;
-}
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