/**
* menu_select - selects the next idle state to enter
* @dev: the CPU
*/
static int menu_select(struct cpuidle_device *dev)
{
struct menu_device *data = &__get_cpu_var(menu_devices);
int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
int int_vote_req = pm_qos_request(PM_QOS_CPU_INT_LATENCY);
unsigned int power_usage = -1;
int i;
int multiplier;
struct timespec t;
unsigned int timer_id = 0;
unsigned int schedule_time = 0xffffffff;
if (data->needs_update) {
menu_update(dev);
data->needs_update = 0;
}
data->last_state_idx = 0;
data->exit_us = 0;
if (unlikely(int_vote_req != PM_QOS_CPUIDLE_INT_DEFAULT_VALUE))
{
PRINT_PWC_DBG(PWC_SWITCH_CPUIDLE,"menu_select,int_vote_req=0x%x\n",int_vote_req);
return 0;
}
if(num_online_cpus() > 1)
return 0;
pwrctrl_sleep_mgr_get_next_schedule_time(0, &timer_id, &schedule_time);
if(schedule_time > (0xFFFFFFFF / 1000))
{
schedule_time = 0xFFFFFFFF;
}
else
{
schedule_time *= USEC_PER_MSEC;
}
/* Special case when user has set very strict latency requirement */
if (unlikely(latency_req == 0))
return 0;
/* determine the expected residency time, round up */
t = ktime_to_timespec(tick_nohz_get_sleep_length());
data->expected_us =
t.tv_sec * USEC_PER_SEC + t.tv_nsec / NSEC_PER_USEC;
PRINT_PWC_DBG(PWC_SWITCH_CPUIDLE,"menu_select,data->expected_us=%d,schedule_time=%d\n",data->expected_us,schedule_time);
if(schedule_time < data->expected_us)
{
/*PRINT_PWC_DBG(PWC_SWITCH_CPUIDLE,"menu_select,system time:%d private time:%d\n",data->expected_us, schedule_time);*/
data->expected_us = schedule_time;
}
data->bucket = which_bucket(data->expected_us);
multiplier = performance_multiplier();
/*
* if the correction factor is 0 (eg first time init or cpu hotplug
* etc), we actually want to start out with a unity factor.
*/
if (data->correction_factor[data->bucket] == 0)
data->correction_factor[data->bucket] = RESOLUTION * DECAY;
/* Make sure to round up for half microseconds */
data->predicted_us = div_round64(data->expected_us * data->correction_factor[data->bucket],
RESOLUTION * DECAY);
detect_repeating_patterns(data);
/*
* We want to default to C1 (hlt), not to busy polling
* unless the timer is happening really really soon.
*/
if (data->expected_us > 5)
data->last_state_idx = CPUIDLE_DRIVER_STATE_START;
/*
* Find the idle state with the lowest power while satisfying
* our constraints.
*/
PRINT_PWC_DBG(PWC_SWITCH_CPUIDLE,"menu_select,multiplier=%d, latency_req=%d, predicted_us=%llu\n",
multiplier,latency_req, data->predicted_us);
for (i = CPUIDLE_DRIVER_STATE_START; i < dev->state_count; i++) {
struct cpuidle_state *s = &dev->states[i];
if (s->flags & CPUIDLE_FLAG_IGNORE)
continue;
if (s->target_residency > data->predicted_us)
continue;
if (s->exit_latency > latency_req)
continue;
if (s->exit_latency * multiplier > data->predicted_us)
continue;
if (s->power_usage < power_usage) {
power_usage = s->power_usage;
data->last_state_idx = i;
data->exit_us = s->exit_latency;
}
}
return data->last_state_idx;
}
/**
* menu_select - selects the next idle state to enter
* @dev: the CPU
*/
static int menu_select(struct cpuidle_device *dev)
{
struct menu_device *data = &__get_cpu_var(menu_devices);
int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
unsigned int power_usage = -1;
int i;
int multiplier;
struct timespec t;
if (data->needs_update) {
menu_update(dev);
data->needs_update = 0;
}
data->last_state_idx = 0;
data->exit_us = 0;
/* Special case when user has set very strict latency requirement */
if (unlikely(latency_req == 0))
return 0;
/* determine the expected residency time, round up */
t = ktime_to_timespec(tick_nohz_get_sleep_length());
data->expected_us =
t.tv_sec * USEC_PER_SEC + t.tv_nsec / NSEC_PER_USEC;
data->bucket = which_bucket(data->expected_us);
multiplier = performance_multiplier();
/*
* if the correction factor is 0 (eg first time init or cpu hotplug
* etc), we actually want to start out with a unity factor.
*/
if (data->correction_factor[data->bucket] == 0)
data->correction_factor[data->bucket] = RESOLUTION * DECAY;
/* Make sure to round up for half microseconds */
data->predicted_us = div_round64(data->expected_us * data->correction_factor[data->bucket],
RESOLUTION * DECAY);
detect_repeating_patterns(data);
/*
* We want to default to C1 (hlt), not to busy polling
* unless the timer is happening really really soon.
*/
if (data->expected_us > 5)
data->last_state_idx = CPUIDLE_DRIVER_STATE_START;
/*
* Find the idle state with the lowest power while satisfying
* our constraints.
*/
for (i = CPUIDLE_DRIVER_STATE_START; i < dev->state_count; i++) {
struct cpuidle_state *s = &dev->states[i];
if (s->flags & CPUIDLE_FLAG_IGNORE)
continue;
if (s->target_residency > data->predicted_us)
continue;
if (s->exit_latency > latency_req)
continue;
if (s->exit_latency * multiplier > data->predicted_us)
continue;
if (s->power_usage < power_usage) {
power_usage = s->power_usage;
data->last_state_idx = i;
data->exit_us = s->exit_latency;
}
}
return data->last_state_idx;
}
