/**
* 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;
}
int enter_lowpm(struct cpuidle_device *dev,
struct cpuidle_state *state)
{
int icanidle = 0;
int idle_time;
int cpu_id = 0;
int cpu_idle_flag = IDLE_DISABLE;
struct cpuidle_state *new_state = state;
struct timeval before, after;
int enter_state;
struct timespec t;
unsigned int timer_id = 0;
unsigned int schedule_time = 0xffffffff;
unsigned int expected_us;
local_irq_disable();
cpu_id = get_cpu();
put_cpu();
if(get_enter_state(state, &enter_state) != 0)
{
local_irq_enable();
return 0;
}
/* Used to keep track of the total time in idle */
getnstimeofday(&before);
#if 1
/*启动过程中不允许ACPU下电*/
/*if((CPU_IDLE_C1 <= enter_state)&&(CPU_IDLE_C3 >= enter_state)&&(before.tv_sec < IDLE_ACTIVE_DELAY_S))*/
if((CPU_IDLE_C1 <= enter_state)&&(CPU_IDLE_C3 >= enter_state)&&(0 == g_pwc_init_flag))
{
PRINT_PWC_DBG(PWC_SWITCH_CPUIDLE,"before.tv_sec:0x%x\n",before.tv_sec);
local_irq_enable();
return 0;
}
#endif
if((RET_OK == pwrctrl_is_func_on(PWC_SWITCH_CPUIDLE))&&((CPU_IDLE_C0 < enter_state)&&(CPU_IDLE_C4 > enter_state))&&(0 == cpu_id))
{
cpu_idle_flag = IDLE_ENABLE;
}
else
{
cpu_idle_flag = IDLE_DISABLE;
}
/*C3起定时器来唤醒 后续可优化*/
if((enter_state >= CPU_IDLE_C3)&&(IDLE_ENABLE == cpu_idle_flag))
{
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;
}
/*C3停止所有TCXO定时器,待优化*/
/* determine the expected residency time, round up */
t = ktime_to_timespec(tick_nohz_get_sleep_length());
expected_us = t.tv_sec * USEC_PER_SEC + t.tv_nsec / NSEC_PER_USEC;
if(schedule_time < expected_us)
{
PRINT_PWC_DBG(PWC_SWITCH_CPUIDLE,"enter_lowpm,system time:%d private time:%d\n",expected_us, schedule_time);
expected_us = schedule_time;
}
expected_us -= state->exit_latency;
DRV_TIMER_STOP(CPU_IDLE_TIMER);
DRV_TIMER_START((unsigned int)CPU_IDLE_TIMER, cpu_idle_timer_isr, (int)0, (expected_us / MSEC_PER_SEC), TIMER_ONCE_COUNT, TIMER_UNIT_MS);
}
if(IDLE_ENABLE == cpu_idle_flag)
{
*gp_cpuidle_state = (enter_state << CPUIDLE_STATE_START_BIT) | (CPU_IDLE_STAT_VALID << CPUIDLE_STATE_MAGIC_START_BIT);
/*pwrctrl_wdt_disable();*/
}
if(0 == cpu_id)
{
PRINT_PWC_DBG(PWC_SWITCH_CPUIDLE,"system will enter cpuidle state(%d)\n",enter_state);
}
if(CPU_IDLE_C0 == enter_state)
{
cpu_do_idle();
}
else if(IDLE_ENABLE == cpu_idle_flag)
{
pwrctrl_deep_sleep();
}
if(enter_state >= SPECIAL_HANDLE_STATE)
{
/*清除timer中断*/
/*C3恢复之前停止所有TCXO定时器,待优化*/
}
if(IDLE_ENABLE == cpu_idle_flag)
{
*gp_cpuidle_state = (CPU_IDLE_C4 << CPUIDLE_STATE_START_BIT) | (CPU_IDLE_STAT_VALID << CPUIDLE_STATE_MAGIC_START_BIT);
/*pwrctrl_wdt_enable();*/
}
getnstimeofday(&after);
idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
(after.tv_usec - before.tv_usec);
local_irq_enable();
return idle_time;
}
