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cpuidle: Add common time keeping and irq enabling

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Make necessary changes to implement time keeping and irq enabling
in the core cpuidle code.  This will allow the removal of these
functionalities from various platform cpuidle implementations whose
timekeeping and irq enabling follows the form in this common code.

Signed-off-by: Robert Lee <[email protected]>
Tested-by: Jean Pihet <[email protected]>
Tested-by: Amit Daniel <[email protected]>
Tested-by: Robert Lee <[email protected]>
Reviewed-by: Kevin Hilman <[email protected]>
Reviewed-by: Daniel Lezcano <[email protected]>
Reviewed-by: Deepthi Dharwar <[email protected]>
Acked-by: Jean Pihet <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Robert Lee 2012-03-20 15:22:42 -05:00 • committed by Len Brown
commit e1689795a7
5 changed files with 122 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

66
drivers/cpuidle/cpuidle.c
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@ -53,6 +53,24 @@ static void cpuidle_kick_cpus(void) {}
static int __cpuidle_register_device(struct cpuidle_device *dev);
static inline int cpuidle_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
struct cpuidle_state *target_state = &drv->states[index];
return target_state->enter(dev, drv, index);
}
static inline int cpuidle_enter_tk(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
return cpuidle_wrap_enter(dev, drv, index, cpuidle_enter);
}
typedef int (*cpuidle_enter_t)(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index);
static cpuidle_enter_t cpuidle_enter_ops;
/**
* cpuidle_idle_call - the main idle loop
*
@ -63,7 +81,6 @@ int cpuidle_idle_call(void)
{
struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices);
struct cpuidle_driver *drv = cpuidle_get_driver();
struct cpuidle_state *target_state;
int next_state, entered_state;
if (off)
@ -92,12 +109,10 @@ int cpuidle_idle_call(void)
return 0;
}
target_state = &drv->states[next_state];
trace_power_start(POWER_CSTATE, next_state, dev->cpu);
trace_cpu_idle(next_state, dev->cpu);
entered_state = target_state->enter(dev, drv, next_state);
entered_state = cpuidle_enter_ops(dev, drv, next_state);
trace_power_end(dev->cpu);
trace_cpu_idle(PWR_EVENT_EXIT, dev->cpu);
@ -110,6 +125,8 @@ int cpuidle_idle_call(void)
dev->states_usage[entered_state].time +=
(unsigned long long)dev->last_residency;
dev->states_usage[entered_state].usage++;
} else {
dev->last_residency = 0;
}
/* give the governor an opportunity to reflect on the outcome */
@ -164,6 +181,37 @@ void cpuidle_resume_and_unlock(void)
EXPORT_SYMBOL_GPL(cpuidle_resume_and_unlock);
/**
* cpuidle_wrap_enter - performs timekeeping and irqen around enter function
* @dev: pointer to a valid cpuidle_device object
* @drv: pointer to a valid cpuidle_driver object
* @index: index of the target cpuidle state.
*/
int cpuidle_wrap_enter(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index,
int (*enter)(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index))
{
ktime_t time_start, time_end;
s64 diff;
time_start = ktime_get();
index = enter(dev, drv, index);
time_end = ktime_get();
local_irq_enable();
diff = ktime_to_us(ktime_sub(time_end, time_start));
if (diff > INT_MAX)
diff = INT_MAX;
dev->last_residency = (int) diff;
return index;
}
#ifdef CONFIG_ARCH_HAS_CPU_RELAX
static int poll_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
@ -212,10 +260,11 @@ static void poll_idle_init(struct cpuidle_driver *drv) {}
int cpuidle_enable_device(struct cpuidle_device *dev)
{
int ret, i;
struct cpuidle_driver *drv = cpuidle_get_driver();
if (dev->enabled)
return 0;
if (!cpuidle_get_driver() || !cpuidle_curr_governor)
if (!drv || !cpuidle_curr_governor)
return -EIO;
if (!dev->state_count)
return -EINVAL;
@ -226,13 +275,16 @@ int cpuidle_enable_device(struct cpuidle_device *dev)
return ret;
}
poll_idle_init(cpuidle_get_driver());
cpuidle_enter_ops = drv->en_core_tk_irqen ?
cpuidle_enter_tk : cpuidle_enter;
poll_idle_init(drv);
if ((ret = cpuidle_add_state_sysfs(dev)))
return ret;
if (cpuidle_curr_governor->enable &&
(ret = cpuidle_curr_governor->enable(cpuidle_get_driver(), dev)))
(ret = cpuidle_curr_governor->enable(drv, dev)))
goto fail_sysfs;
for (i = 0; i < dev->state_count; i++) {