[mirror_ubuntu-bionic-kernel.git] / drivers / cpuidle / poll_state.c

/*
 * poll_state.c - Polling idle state
 *
 * This file is released under the GPLv2.
 */

#include <linux/cpuidle.h>
#include <linux/sched.h>
#include <linux/sched/idle.h>

static int __cpuidle poll_idle(struct cpuidle_device *dev,
			       struct cpuidle_driver *drv, int index)
{
	local_irq_enable();
	if (!current_set_polling_and_test()) {
		while (!need_resched())
			cpu_relax();
	}
	current_clr_polling();

	return index;
}

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->enter = poll_idle;
	state->disabled = false;
	state->flags = CPUIDLE_FLAG_POLLING;
}
Commit	Line	Data
34c2f65b RW	1	/*
	2	* poll_state.c - Polling idle state
	3	*
	4	* This file is released under the GPLv2.
	5	*/
	6
	7	#include <linux/cpuidle.h>
	8	#include <linux/sched.h>
	9	#include <linux/sched/idle.h>
	10
	11	static int __cpuidle poll_idle(struct cpuidle_device *dev,
	12	struct cpuidle_driver *drv, int index)
	13	{
	14	local_irq_enable();
	15	if (!current_set_polling_and_test()) {
	16	while (!need_resched())
	17	cpu_relax();
	18	}
	19	current_clr_polling();
	20
	21	return index;
	22	}
	23
	24	void poll_idle_init(struct cpuidle_driver *drv)
	25	{
	26	struct cpuidle_state *state = &drv->states[0];
	27
	28	snprintf(state->name, CPUIDLE_NAME_LEN, "POLL");
	29	snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE");
	30	state->exit_latency = 0;
	31	state->target_residency = 0;
	32	state->power_usage = -1;
	33	state->enter = poll_idle;
	34	state->disabled = false;
	35	state->flags = CPUIDLE_FLAG_POLLING;
	36	}