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authorRafael J. Wysocki <rjw@sisk.pl>2011-10-07 23:16:55 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-10-07 23:16:55 +0200
commitd727b60659a1173eb4142a5fc521ce67c28b34e1 (patch)
tree793d0fc86ecf98331024db5c86bc271cc72aa2d2 /drivers/base
parent3ee72ca99288f1de95ec9c570e43f531c8799f06 (diff)
parent2a5306cc5f383b0e7414c75e458111afd4a563a4 (diff)
downloadlinux-d727b60659a1173eb4142a5fc521ce67c28b34e1.tar.bz2
Merge branch 'pm-runtime' into pm-for-linus
* pm-runtime: PM / Tracing: build rpm-traces.c only if CONFIG_PM_RUNTIME is set PM / Runtime: Replace dev_dbg() with trace_rpm_*() PM / Runtime: Introduce trace points for tracing rpm_* functions PM / Runtime: Don't run callbacks under lock for power.irq_safe set USB: Add wakeup info to debugging messages PM / Runtime: pm_runtime_idle() can be called in atomic context PM / Runtime: Add macro to test for runtime PM events PM / Runtime: Add might_sleep() to runtime PM functions
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/runtime.c94
1 files changed, 65 insertions, 29 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index acb3f83b8079..7a6fb5e34a0e 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -9,6 +9,7 @@
#include <linux/sched.h>
#include <linux/pm_runtime.h>
+#include <trace/events/rpm.h>
#include "power.h"
static int rpm_resume(struct device *dev, int rpmflags);
@@ -155,6 +156,31 @@ static int rpm_check_suspend_allowed(struct device *dev)
}
/**
+ * __rpm_callback - Run a given runtime PM callback for a given device.
+ * @cb: Runtime PM callback to run.
+ * @dev: Device to run the callback for.
+ */
+static int __rpm_callback(int (*cb)(struct device *), struct device *dev)
+ __releases(&dev->power.lock) __acquires(&dev->power.lock)
+{
+ int retval;
+
+ if (dev->power.irq_safe)
+ spin_unlock(&dev->power.lock);
+ else
+ spin_unlock_irq(&dev->power.lock);
+
+ retval = cb(dev);
+
+ if (dev->power.irq_safe)
+ spin_lock(&dev->power.lock);
+ else
+ spin_lock_irq(&dev->power.lock);
+
+ return retval;
+}
+
+/**
* rpm_idle - Notify device bus type if the device can be suspended.
* @dev: Device to notify the bus type about.
* @rpmflags: Flag bits.
@@ -171,6 +197,7 @@ static int rpm_idle(struct device *dev, int rpmflags)
int (*callback)(struct device *);
int retval;
+ trace_rpm_idle(dev, rpmflags);
retval = rpm_check_suspend_allowed(dev);
if (retval < 0)
; /* Conditions are wrong. */
@@ -225,24 +252,14 @@ static int rpm_idle(struct device *dev, int rpmflags)
else
callback = NULL;
- if (callback) {
- if (dev->power.irq_safe)
- spin_unlock(&dev->power.lock);
- else
- spin_unlock_irq(&dev->power.lock);
-
- callback(dev);
-
- if (dev->power.irq_safe)
- spin_lock(&dev->power.lock);
- else
- spin_lock_irq(&dev->power.lock);
- }
+ if (callback)
+ __rpm_callback(callback, dev);
dev->power.idle_notification = false;
wake_up_all(&dev->power.wait_queue);
out:
+ trace_rpm_return_int(dev, _THIS_IP_, retval);
return retval;
}
@@ -252,22 +269,14 @@ static int rpm_idle(struct device *dev, int rpmflags)
* @dev: Device to run the callback for.
*/
static int rpm_callback(int (*cb)(struct device *), struct device *dev)
- __releases(&dev->power.lock) __acquires(&dev->power.lock)
{
int retval;
if (!cb)
return -ENOSYS;
- if (dev->power.irq_safe) {
- retval = cb(dev);
- } else {
- spin_unlock_irq(&dev->power.lock);
-
- retval = cb(dev);
+ retval = __rpm_callback(cb, dev);
- spin_lock_irq(&dev->power.lock);
- }
dev->power.runtime_error = retval;
return retval != -EACCES ? retval : -EIO;
}
@@ -295,7 +304,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
struct device *parent = NULL;
int retval;
- dev_dbg(dev, "%s flags 0x%x\n", __func__, rpmflags);
+ trace_rpm_suspend(dev, rpmflags);
repeat:
retval = rpm_check_suspend_allowed(dev);
@@ -347,6 +356,15 @@ static int rpm_suspend(struct device *dev, int rpmflags)
goto out;
}
+ if (dev->power.irq_safe) {
+ spin_unlock(&dev->power.lock);
+
+ cpu_relax();
+
+ spin_lock(&dev->power.lock);
+ goto repeat;
+ }
+
/* Wait for the other suspend running in parallel with us. */
for (;;) {
prepare_to_wait(&dev->power.wait_queue, &wait,
@@ -430,7 +448,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
}
out:
- dev_dbg(dev, "%s returns %d\n", __func__, retval);
+ trace_rpm_return_int(dev, _THIS_IP_, retval);
return retval;
}
@@ -459,7 +477,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
struct device *parent = NULL;
int retval = 0;
- dev_dbg(dev, "%s flags 0x%x\n", __func__, rpmflags);
+ trace_rpm_resume(dev, rpmflags);
repeat:
if (dev->power.runtime_error)
@@ -496,6 +514,15 @@ static int rpm_resume(struct device *dev, int rpmflags)
goto out;
}
+ if (dev->power.irq_safe) {
+ spin_unlock(&dev->power.lock);
+
+ cpu_relax();
+
+ spin_lock(&dev->power.lock);
+ goto repeat;
+ }
+
/* Wait for the operation carried out in parallel with us. */
for (;;) {
prepare_to_wait(&dev->power.wait_queue, &wait,
@@ -615,7 +642,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
spin_lock_irq(&dev->power.lock);
}
- dev_dbg(dev, "%s returns %d\n", __func__, retval);
+ trace_rpm_return_int(dev, _THIS_IP_, retval);
return retval;
}
@@ -732,13 +759,16 @@ EXPORT_SYMBOL_GPL(pm_schedule_suspend);
* return immediately if it is larger than zero. Then carry out an idle
* notification, either synchronous or asynchronous.
*
- * This routine may be called in atomic context if the RPM_ASYNC flag is set.
+ * This routine may be called in atomic context if the RPM_ASYNC flag is set,
+ * or if pm_runtime_irq_safe() has been called.
*/
int __pm_runtime_idle(struct device *dev, int rpmflags)
{
unsigned long flags;
int retval;
+ might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
+
if (rpmflags & RPM_GET_PUT) {
if (!atomic_dec_and_test(&dev->power.usage_count))
return 0;
@@ -761,13 +791,16 @@ EXPORT_SYMBOL_GPL(__pm_runtime_idle);
* return immediately if it is larger than zero. Then carry out a suspend,
* either synchronous or asynchronous.
*
- * This routine may be called in atomic context if the RPM_ASYNC flag is set.
+ * This routine may be called in atomic context if the RPM_ASYNC flag is set,
+ * or if pm_runtime_irq_safe() has been called.
*/
int __pm_runtime_suspend(struct device *dev, int rpmflags)
{
unsigned long flags;
int retval;
+ might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
+
if (rpmflags & RPM_GET_PUT) {
if (!atomic_dec_and_test(&dev->power.usage_count))
return 0;
@@ -789,13 +822,16 @@ EXPORT_SYMBOL_GPL(__pm_runtime_suspend);
* If the RPM_GET_PUT flag is set, increment the device's usage count. Then
* carry out a resume, either synchronous or asynchronous.
*
- * This routine may be called in atomic context if the RPM_ASYNC flag is set.
+ * This routine may be called in atomic context if the RPM_ASYNC flag is set,
+ * or if pm_runtime_irq_safe() has been called.
*/
int __pm_runtime_resume(struct device *dev, int rpmflags)
{
unsigned long flags;
int retval;
+ might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe);
+
if (rpmflags & RPM_GET_PUT)
atomic_inc(&dev->power.usage_count);