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Commit 12572dbb authored by Mark Rutland's avatar Mark Rutland Committed by Thomas Gleixner
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clockevents: Add generic timer broadcast receiver 



Currently the broadcast mechanism used for timers is abstracted by a
function pointer on struct clock_event_device. As the fundamental
mechanism for broadcast is architecture-specific, this ties each
clock_event_device driver to a single architecture, even where the
driver is otherwise generic.

This patch adds a standard path for the receipt of timer broadcasts, so
drivers and/or architecture backends need not manage redundant lists of
timers for the purpose of routing broadcast timer ticks.

[tglx: Made the implementation depend on the config switch as well ]

Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
Reviewed-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: nico@linaro.org
Cc: Will.Deacon@arm.com
Cc: Marc.Zyngier@arm.com
Cc: john.stultz@linaro.org
Link: http://lkml.kernel.org/r/1358183124-28461-2-git-send-email-mark.rutland@arm.com


Tested-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 04c2eee5

include/linux/clockchips.h

+4 −0
Original line number Diff line number Diff line
@@ -161,6 +161,10 @@ clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 minsec) 
extern void clockevents_suspend(void);

extern void clockevents_resume(void);



#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST

extern int tick_receive_broadcast(void);

#endif



#ifdef CONFIG_GENERIC_CLOCKEVENTS

extern void clockevents_notify(unsigned long reason, void *arg);

#else

kernel/time/tick-broadcast.c

+17 −0
Original line number Diff line number Diff line
@@ -125,6 +125,23 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) 
	return ret;

}



#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST

int tick_receive_broadcast(void)

{

	struct tick_device *td = this_cpu_ptr(&tick_cpu_device);

	struct clock_event_device *evt = td->evtdev;



	if (!evt)

		return -ENODEV;



	if (!evt->event_handler)

		return -EINVAL;



	evt->event_handler(evt);

	return 0;

}

#endif



/*

 * Broadcast the event to the cpus, which are set in the mask (mangled).

 */