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authorIan Campbell <ian.campbell@citrix.com>2011-10-03 15:37:00 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-11 09:43:13 -0800
commitcce574ff161d0f5e4263ed28a4a3785220802922 (patch)
tree246275f4b0f8fb379114880a0be9b7af3f1e6ba3 /kernel
parent734c81f73201c96a4669793c27f363a334770d79 (diff)
downloadlinux-linaro-precise-cce574ff161d0f5e4263ed28a4a3785220802922.tar.gz
genirq: Add IRQF_RESUME_EARLY and resume such IRQs earlier
commit 9bab0b7fbaceec47d32db51cd9e59c82fb071f5a upstream. This adds a mechanism to resume selected IRQs during syscore_resume instead of dpm_resume_noirq. Under Xen we need to resume IRQs associated with IPIs early enough that the resched IPI is unmasked and we can therefore schedule ourselves out of the stop_machine where the suspend/resume takes place. This issue was introduced by 676dc3cf5bc3 "xen: Use IRQF_FORCE_RESUME". Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Jeremy Fitzhardinge <Jeremy.Fitzhardinge@citrix.com> Cc: xen-devel <xen-devel@lists.xensource.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Link: http://lkml.kernel.org/r/1318713254.11016.52.camel@dagon.hellion.org.uk Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/pm.c48
1 files changed, 41 insertions, 7 deletions
diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
index f76fc00c987..15e53b1766a 100644
--- a/kernel/irq/pm.c
+++ b/kernel/irq/pm.c
@@ -9,6 +9,7 @@
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/interrupt.h>
+#include <linux/syscore_ops.h>
#include "internals.h"
@@ -39,25 +40,58 @@ void suspend_device_irqs(void)
}
EXPORT_SYMBOL_GPL(suspend_device_irqs);
-/**
- * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
- *
- * Enable all interrupt lines previously disabled by suspend_device_irqs() that
- * have the IRQS_SUSPENDED flag set.
- */
-void resume_device_irqs(void)
+static void resume_irqs(bool want_early)
{
struct irq_desc *desc;
int irq;
for_each_irq_desc(irq, desc) {
unsigned long flags;
+ bool is_early = desc->action &&
+ desc->action->flags & IRQF_EARLY_RESUME;
+
+ if (is_early != want_early)
+ continue;
raw_spin_lock_irqsave(&desc->lock, flags);
__enable_irq(desc, irq, true);
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
}
+
+/**
+ * irq_pm_syscore_ops - enable interrupt lines early
+ *
+ * Enable all interrupt lines with %IRQF_EARLY_RESUME set.
+ */
+static void irq_pm_syscore_resume(void)
+{
+ resume_irqs(true);
+}
+
+static struct syscore_ops irq_pm_syscore_ops = {
+ .resume = irq_pm_syscore_resume,
+};
+
+static int __init irq_pm_init_ops(void)
+{
+ register_syscore_ops(&irq_pm_syscore_ops);
+ return 0;
+}
+
+device_initcall(irq_pm_init_ops);
+
+/**
+ * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
+ *
+ * Enable all non-%IRQF_EARLY_RESUME interrupt lines previously
+ * disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag
+ * set as well as those with %IRQF_FORCE_RESUME.
+ */
+void resume_device_irqs(void)
+{
+ resume_irqs(false);
+}
EXPORT_SYMBOL_GPL(resume_device_irqs);
/**