void usecase_update_governor_state(void)
{
bool cancel_work = false;
/*
* usecase_mutex will have to be unlocked to ensure safe exit of
* delayed_usecase_work(). Protect this function with its own mutex
* from being executed by multiple threads at that point.
*/
mutex_lock(&state_mutex);
mutex_lock(&usecase_mutex);
if (uc_master_enable && (usecase_conf[UX500_UC_AUTO].enable ||
usecase_conf[UX500_UC_USER].enable)) {
/*
* Usecases are enabled. If we are in early suspend put
* governor to work.
*/
if ((is_early_suspend ||
(usecase_conf[UX500_UC_USER].enable &&
usecase_conf[UX500_UC_USER].force_usecase)) &&
!is_work_scheduled) {
schedule_delayed_work_on(0, &work_usecase,
msecs_to_jiffies(CPULOAD_MEAS_DELAY));
is_work_scheduled = true;
} else if (!is_early_suspend && is_work_scheduled) {
/* Exiting from early suspend. */
cancel_work = true;
}
} else if (is_work_scheduled) {
/* No usecase enabled or governor is not enabled. */
cancel_work = true;
}
if (cancel_work) {
/*
* usecase_mutex is used by delayed_usecase_work() so it must
* be unlocked before we call to cacnel the work.
*/
mutex_unlock(&usecase_mutex);
cancel_delayed_work_sync(&work_usecase);
mutex_lock(&usecase_mutex);
is_work_scheduled = false;
/*
* Set the default settings before exiting,
* except when a forced usecase is enabled.
*/
if (!(usecase_conf[UX500_UC_USER].enable &&
usecase_conf[UX500_UC_USER].force_usecase))
set_cpu_config(UX500_UC_NORMAL);
}
mutex_unlock(&usecase_mutex);
mutex_unlock(&state_mutex);
}
void disable_cpu_config(struct work_struct *work)
{
set_cpu_config(0);
}
void enable_cpu_config(struct work_struct *work)
{
set_cpu_config(1);
}
static void delayed_usecase_work(struct work_struct *work)
{
unsigned long avg, load, trend, balance;
bool inc_perf = false;
bool dec_perf = false;
u32 irqs_per_s;
/* determine loadavg */
avg = determine_loadavg();
hp_printk("loadavg = %lu lower th %lu upper th %lu\n",
avg, lower_threshold, upper_threshold);
/* determine instant load */
load = determine_cpu_load();
hp_printk("cpu instant load = %lu max %lu\n", load, max_instant);
/* determine load trend */
trend = determine_cpu_load_trend();
hp_printk("cpu load trend = %lu min %lu unbal %lu\n",
trend, min_trend, trend_unbalance);
/* determine load balancing */
balance = determine_cpu_balance_trend();
hp_printk("load balancing trend = %lu min %lu\n",
balance, max_unbalance);
irqs_per_s = get_num_interrupts_per_s();
/* Dont let configuration change in the middle of our calculations. */
mutex_lock(&usecase_mutex);
/* detect "instant" load increase */
if (load > max_instant || irqs_per_s > exit_irq_per_s) {
inc_perf = true;
} else if (!usecase_conf[UX500_UC_USER].enable &&
usecase_conf[UX500_UC_AUTO].enable) {
/* detect high loadavg use case */
if (avg > upper_threshold)
inc_perf = true;
/* detect idle use case */
else if (trend < min_trend)
dec_perf = true;
/* detect unbalanced low cpu load use case */
else if ((balance > max_unbalance) && (trend < trend_unbalance))
dec_perf = true;
/* detect low loadavg use case */
else if (avg < lower_threshold)
dec_perf = true;
/* All user use cases disabled, current load not triggering
* any change.
*/
else if (user_config_updated)
dec_perf = true;
} else {
dec_perf = true;
}
/*
* set_cpu_config() will not update the config unless it has been
* changed.
*/
if (dec_perf) {
if (usecase_conf[UX500_UC_USER].enable)
set_cpu_config(UX500_UC_USER);
else if (usecase_conf[UX500_UC_AUTO].enable)
set_cpu_config(UX500_UC_AUTO);
} else if (inc_perf &&
!(usecase_conf[UX500_UC_USER].enable &&
usecase_conf[UX500_UC_USER].force_usecase)) {
set_cpu_config(UX500_UC_NORMAL);
}
mutex_unlock(&usecase_mutex);
/* reprogramm scheduled work */
schedule_delayed_work_on(0, &work_usecase,
msecs_to_jiffies(CPULOAD_MEAS_DELAY));
}