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Merge branch 'pm-runtime' into pm-for-linus

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* pm-runtime:
  PM / Runtime: Use device PM QoS constraints (v2)
This commit is contained in:
Rafael J. Wysocki 2011-12-25 23:43:05 +01:00
commit 0015afaa1f
5 changed files with 154 additions and 28 deletions
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24
drivers/base/power/qos.c
View File

@ -47,21 +47,29 @@ static DEFINE_MUTEX(dev_pm_qos_mtx);
static BLOCKING_NOTIFIER_HEAD(dev_pm_notifiers);
/**
* dev_pm_qos_read_value - Get PM QoS constraint for a given device.
* __dev_pm_qos_read_value - Get PM QoS constraint for a given device.
* @dev: Device to get the PM QoS constraint value for.
*
* This routine must be called with dev->power.lock held.
*/
s32 __dev_pm_qos_read_value(struct device *dev)
{
struct pm_qos_constraints *c = dev->power.constraints;
return c ? pm_qos_read_value(c) : 0;
}
/**
* dev_pm_qos_read_value - Get PM QoS constraint for a given device (locked).
* @dev: Device to get the PM QoS constraint value for.
*/
s32 dev_pm_qos_read_value(struct device *dev)
{
struct pm_qos_constraints *c;
unsigned long flags;
s32 ret = 0;
s32 ret;
spin_lock_irqsave(&dev->power.lock, flags);
c = dev->power.constraints;
if (c)
ret = pm_qos_read_value(c);
ret = __dev_pm_qos_read_value(dev);
spin_unlock_irqrestore(&dev->power.lock, flags);
return ret;

148
drivers/base/power/runtime.c
View File

@ -282,6 +282,47 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
return retval != -EACCES ? retval : -EIO;
}
struct rpm_qos_data {
ktime_t time_now;
s64 constraint_ns;
};
/**
* rpm_update_qos_constraint - Update a given PM QoS constraint data.
* @dev: Device whose timing data to use.
* @data: PM QoS constraint data to update.
*
* Use the suspend timing data of @dev to update PM QoS constraint data pointed
* to by @data.
*/
static int rpm_update_qos_constraint(struct device *dev, void *data)
{
struct rpm_qos_data *qos = data;
unsigned long flags;
s64 delta_ns;
int ret = 0;
spin_lock_irqsave(&dev->power.lock, flags);
if (dev->power.max_time_suspended_ns < 0)
goto out;
delta_ns = dev->power.max_time_suspended_ns -
ktime_to_ns(ktime_sub(qos->time_now, dev->power.suspend_time));
if (delta_ns <= 0) {
ret = -EBUSY;
goto out;
}
if (qos->constraint_ns > delta_ns || qos->constraint_ns == 0)
qos->constraint_ns = delta_ns;
out:
spin_unlock_irqrestore(&dev->power.lock, flags);
return ret;
}
/**
* rpm_suspend - Carry out runtime suspend of given device.
* @dev: Device to suspend.
@ -308,6 +349,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
{
int (*callback)(struct device *);
struct device *parent = NULL;
struct rpm_qos_data qos;
int retval;
trace_rpm_suspend(dev, rpmflags);
@ -403,8 +445,38 @@ static int rpm_suspend(struct device *dev, int rpmflags)
goto out;
}
qos.constraint_ns = __dev_pm_qos_read_value(dev);
if (qos.constraint_ns < 0) {
/* Negative constraint means "never suspend". */
retval = -EPERM;
goto out;
}
qos.constraint_ns *= NSEC_PER_USEC;
qos.time_now = ktime_get();
__update_runtime_status(dev, RPM_SUSPENDING);
if (!dev->power.ignore_children) {
if (dev->power.irq_safe)
spin_unlock(&dev->power.lock);
else
spin_unlock_irq(&dev->power.lock);
retval = device_for_each_child(dev, &qos,
rpm_update_qos_constraint);
if (dev->power.irq_safe)
spin_lock(&dev->power.lock);
else
spin_lock_irq(&dev->power.lock);
if (retval)
goto fail;
}
dev->power.suspend_time = qos.time_now;
dev->power.max_time_suspended_ns = qos.constraint_ns ? : -1;
if (dev->pm_domain)
callback = dev->pm_domain->ops.runtime_suspend;
else if (dev->type && dev->type->pm)
@ -420,27 +492,9 @@ static int rpm_suspend(struct device *dev, int rpmflags)
callback = dev->driver->pm->runtime_suspend;
retval = rpm_callback(callback, dev);
if (retval) {
__update_runtime_status(dev, RPM_ACTIVE);
dev->power.deferred_resume = false;
if (retval == -EAGAIN || retval == -EBUSY) {
dev->power.runtime_error = 0;
if (retval)
goto fail;
/*
* If the callback routine failed an autosuspend, and
* if the last_busy time has been updated so that there
* is a new autosuspend expiration time, automatically
* reschedule another autosuspend.
*/
if ((rpmflags & RPM_AUTO) &&
pm_runtime_autosuspend_expiration(dev) != 0)
goto repeat;
} else {
pm_runtime_cancel_pending(dev);
}
wake_up_all(&dev->power.wait_queue);
goto out;
}
no_callback:
__update_runtime_status(dev, RPM_SUSPENDED);
pm_runtime_deactivate_timer(dev);
@ -472,6 +526,29 @@ static int rpm_suspend(struct device *dev, int rpmflags)
trace_rpm_return_int(dev, _THIS_IP_, retval);
return retval;
fail:
__update_runtime_status(dev, RPM_ACTIVE);
dev->power.suspend_time = ktime_set(0, 0);
dev->power.max_time_suspended_ns = -1;
dev->power.deferred_resume = false;
if (retval == -EAGAIN || retval == -EBUSY) {
dev->power.runtime_error = 0;
/*
* If the callback routine failed an autosuspend, and
* if the last_busy time has been updated so that there
* is a new autosuspend expiration time, automatically
* reschedule another autosuspend.
*/
if ((rpmflags & RPM_AUTO) &&
pm_runtime_autosuspend_expiration(dev) != 0)
goto repeat;
} else {
pm_runtime_cancel_pending(dev);
}
wake_up_all(&dev->power.wait_queue);
goto out;
}
/**
@ -626,6 +703,9 @@ static int rpm_resume(struct device *dev, int rpmflags)
if (dev->power.no_callbacks)
goto no_callback; /* Assume success. */
dev->power.suspend_time = ktime_set(0, 0);
dev->power.max_time_suspended_ns = -1;
__update_runtime_status(dev, RPM_RESUMING);
if (dev->pm_domain)
@ -1288,6 +1368,9 @@ void pm_runtime_init(struct device *dev)
setup_timer(&dev->power.suspend_timer, pm_suspend_timer_fn,
(unsigned long)dev);
dev->power.suspend_time = ktime_set(0, 0);
dev->power.max_time_suspended_ns = -1;
init_waitqueue_head(&dev->power.wait_queue);
}
@ -1305,3 +1388,28 @@ void pm_runtime_remove(struct device *dev)
if (dev->power.irq_safe && dev->parent)
pm_runtime_put_sync(dev->parent);
}
/**
* pm_runtime_update_max_time_suspended - Update device's suspend time data.
* @dev: Device to handle.
* @delta_ns: Value to subtract from the device's max_time_suspended_ns field.
*
* Update the device's power.max_time_suspended_ns field by subtracting
* @delta_ns from it. The resulting value of power.max_time_suspended_ns is
* never negative.
*/
void pm_runtime_update_max_time_suspended(struct device *dev, s64 delta_ns)
{
unsigned long flags;
spin_lock_irqsave(&dev->power.lock, flags);
if (delta_ns > 0 && dev->power.max_time_suspended_ns > 0) {
if (dev->power.max_time_suspended_ns > delta_ns)
dev->power.max_time_suspended_ns -= delta_ns;
else
dev->power.max_time_suspended_ns = 0;
}
spin_unlock_irqrestore(&dev->power.lock, flags);
}

2
include/linux/pm.h
View File

@ -508,6 +508,8 @@ struct dev_pm_info {
unsigned long active_jiffies;
unsigned long suspended_jiffies;
unsigned long accounting_timestamp;
ktime_t suspend_time;
s64 max_time_suspended_ns;
#endif
struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */
struct pm_qos_constraints *constraints;

3
include/linux/pm_qos.h
View File

@ -78,6 +78,7 @@ int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
int pm_qos_request_active(struct pm_qos_request *req);
s32 pm_qos_read_value(struct pm_qos_constraints *c);
s32 __dev_pm_qos_read_value(struct device *dev);
s32 dev_pm_qos_read_value(struct device *dev);
int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
s32 value);
@ -119,6 +120,8 @@ static inline int pm_qos_request_active(struct pm_qos_request *req)
static inline s32 pm_qos_read_value(struct pm_qos_constraints *c)
{ return 0; }
static inline s32 __dev_pm_qos_read_value(struct device *dev)
{ return 0; }
static inline s32 dev_pm_qos_read_value(struct device *dev)
{ return 0; }
static inline int dev_pm_qos_add_request(struct device *dev,

5
include/linux/pm_runtime.h
View File

@ -45,6 +45,8 @@ extern void pm_runtime_irq_safe(struct device *dev);
extern void __pm_runtime_use_autosuspend(struct device *dev, bool use);
extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);
extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev);
extern void pm_runtime_update_max_time_suspended(struct device *dev,
s64 delta_ns);
static inline bool pm_children_suspended(struct device *dev)
{
@ -148,6 +150,9 @@ static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
static inline unsigned long pm_runtime_autosuspend_expiration(
struct device *dev) { return 0; }
static inline void pm_runtime_update_max_time_suspended(struct device *dev,
s64 delta_ns) {}
#endif /* !CONFIG_PM_RUNTIME */
static inline int pm_runtime_idle(struct device *dev)