diff options
Diffstat (limited to 'drivers/cpuidle/driver.c')
| -rw-r--r-- | drivers/cpuidle/driver.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c index 2458a741ad45..06dbe7c86199 100644 --- a/drivers/cpuidle/driver.c +++ b/drivers/cpuidle/driver.c @@ -10,6 +10,7 @@ #include <linux/mutex.h> #include <linux/module.h> +#include <linux/sched.h> #include <linux/cpuidle.h> #include <linux/cpumask.h> #include <linux/clockchips.h> @@ -177,6 +178,45 @@ static void __cpuidle_driver_init(struct cpuidle_driver *drv) } } +#ifdef CONFIG_ARCH_HAS_CPU_RELAX +static int poll_idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + ktime_t t1, t2; + s64 diff; + + t1 = ktime_get(); + local_irq_enable(); + while (!need_resched()) + cpu_relax(); + + t2 = ktime_get(); + diff = ktime_to_us(ktime_sub(t2, t1)); + if (diff > INT_MAX) + diff = INT_MAX; + + dev->last_residency = (int) diff; + + return index; +} + +static void poll_idle_init(struct cpuidle_driver *drv) +{ + struct cpuidle_state *state = &drv->states[0]; + + snprintf(state->name, CPUIDLE_NAME_LEN, "POLL"); + snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE"); + state->exit_latency = 0; + state->target_residency = 0; + state->power_usage = -1; + state->flags = 0; + state->enter = poll_idle; + state->disabled = false; +} +#else +static void poll_idle_init(struct cpuidle_driver *drv) {} +#endif /* !CONFIG_ARCH_HAS_CPU_RELAX */ + /** * __cpuidle_register_driver: register the driver * @drv: a valid pointer to a struct cpuidle_driver @@ -210,6 +250,8 @@ static int __cpuidle_register_driver(struct cpuidle_driver *drv) on_each_cpu_mask(drv->cpumask, cpuidle_setup_broadcast_timer, (void *)CLOCK_EVT_NOTIFY_BROADCAST_ON, 1); + poll_idle_init(drv); + return 0; } |