static void pseries_dedicated_idle_sleep(void)
{
unsigned int cpu = smp_processor_id();
unsigned long start_snooze;
/*
* Indicate to the HV that we are idle. Now would be
* a good time to find other work to dispatch.
*/
get_lppaca()->idle = 1;
/*
* We come in with interrupts disabled, and need_resched()
* has been checked recently. If we should poll for a little
* while, do so.
*/
if (__get_cpu_var(smt_snooze_delay)) {
start_snooze = get_tb() +
__get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
while (get_tb() < start_snooze) {
if (need_resched() || need_resched_delayed() ||
cpu_is_offline(cpu))
goto out;
ppc64_runlatch_off();
HMT_low();
HMT_very_low();
}
HMT_medium();
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb();
local_irq_disable();
if (need_resched() || need_resched_delayed() ||
cpu_is_offline(cpu))
goto out;
}
cede_processor();
out:
HMT_medium();
get_lppaca()->idle = 0;
}
/*
* The body of the idle task.
*/
void cpu_idle(void)
{
if (ppc_md.idle_loop)
ppc_md.idle_loop(); /* doesn't return */
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
hrtimer_stop_sched_tick();
while (!need_resched() && !need_resched_delayed() &&
!cpu_should_die()) {
ppc64_runlatch_off();
/*
*
* We have irqs disabled here, so stop latency tracing
* at this point and restart it after we return:
*/
stop_critical_timing();
if (ppc_md.power_save) {
clear_thread_flag(TIF_POLLING_NRFLAG);
/*
* smp_mb is so clearing of TIF_POLLING_NRFLAG
* is ordered w.r.t. need_resched() test.
*/
smp_mb();
local_irq_disable();
/* check again after disabling irqs */
if (!need_resched() && !cpu_should_die())
ppc_md.power_save();
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
} else {
/*
* Go into low thread priority and possibly
* low power mode.
*/
HMT_low();
HMT_very_low();
}
touch_critical_timing();
}
HMT_medium();
ppc64_runlatch_on();
if (cpu_should_die())
cpu_die();
hrtimer_restart_sched_tick();
__preempt_enable_no_resched();
schedule();
preempt_disable();
}
}
/*
* The body of the idle task.
*/
void cpu_idle(void)
{
if (ppc_md.idle_loop)
ppc_md.idle_loop(); /* doesn't return */
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
while (!need_resched() && !need_resched_delayed() &&
!cpu_should_die()) {
ppc64_runlatch_off();
if (ppc_md.power_save) {
clear_thread_flag(TIF_POLLING_NRFLAG);
/*
* smp_mb is so clearing of TIF_POLLING_NRFLAG
* is ordered w.r.t. need_resched() test.
*/
smp_mb();
local_irq_disable();
/* check again after disabling irqs */
if (!need_resched() && !cpu_should_die())
ppc_md.power_save();
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
} else {
/*
* Go into low thread priority and possibly
* low power mode.
*/
HMT_low();
HMT_very_low();
}
}
HMT_medium();
ppc64_runlatch_on();
if (cpu_should_die())
cpu_die();
__preempt_enable_no_resched();
schedule();
preempt_disable();
}
}
void omap2_pm_idle(void)
{
local_irq_disable();
local_fiq_disable();
if (need_resched() || need_resched_delayed()) {
local_fiq_enable();
local_irq_enable();
return;
}
/*
* Since an interrupt may set up a timer, we don't want to
* reprogram the hardware timer with interrupts enabled.
* Re-enable interrupts only after returning from idle.
*/
timer_dyn_reprogram();
omap2_sram_idle();
local_fiq_enable();
local_irq_enable();
}
