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Commit 4c3d3d24 authored by J. Avila's avatar J. Avila
Browse files

ANDROID: GKI: kernel: tick-sched: Add an API for wakeup callbacks 



Some modules perform actions on wake, as checked in tick-sched. Add a
function to register callbacks and export it.

Bug: 161415027
Bug: 161414381
Signed-off-by: default avatarJ. Avila <elavila@google.com>
Change-Id: I7e1da4aea9e78ad2a7f0c407d4162fabc0e368a7
parent f35f6c67

include/linux/tick.h

+2 −0
Original line number Diff line number Diff line
@@ -111,6 +111,8 @@ enum tick_dep_bits { 
#define TICK_DEP_MASK_SCHED		(1 << TICK_DEP_BIT_SCHED)

#define TICK_DEP_MASK_CLOCK_UNSTABLE	(1 << TICK_DEP_BIT_CLOCK_UNSTABLE)



extern void register_tick_sched_wakeup_callback(void (*cb)(void));



#ifdef CONFIG_NO_HZ_COMMON

extern bool tick_nohz_enabled;

extern bool tick_nohz_tick_stopped(void);

kernel/time/tick-sched.c

+21 −1
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/module.h>

#include <linux/irq_work.h>

#include <linux/posix-timers.h>

#include <linux/timer.h>

#include <linux/context_tracking.h>

#include <linux/mm.h>
@@ -1258,6 +1259,9 @@ void tick_irq_enter(void) 
 * High resolution timer specific code

 */

#ifdef CONFIG_HIGH_RES_TIMERS



static void (*wake_callback)(void);



/*

 * We rearm the timer until we get disabled by the idle code.

 * Called with interrupts disabled.
@@ -1275,8 +1279,15 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer) 
	 * Do not call, when we are not in irq context and have

	 * no valid regs pointer

	 */

	if (regs)

	if (regs) {

		tick_sched_handle(ts, regs);

		if (wake_callback && tick_do_timer_cpu == smp_processor_id()) {

			/*

			 * wakeup user if needed

			 */

			wake_callback();

		}

	}

	else

		ts->next_tick = 0;
@@ -1393,6 +1404,15 @@ int tick_check_oneshot_change(int allow_nohz) 
	return 0;

}



void register_tick_sched_wakeup_callback(void (*cb)(void))

{

	if (!wake_callback)

		wake_callback = cb;

	else

		pr_warn("tick-sched wake cb already exists; skipping.\n");

}

EXPORT_SYMBOL_GPL(register_tick_sched_wakeup_callback);



ktime_t *get_next_event_cpu(unsigned int cpu)

{

	return &(per_cpu(tick_cpu_device, cpu).evtdev->next_event);