Commit 12572dbb authored Jan 14, 2013 by Mark Rutland Committed by Thomas Gleixner Jan 31, 2013

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: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Santosh 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: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Thomas 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).
		*/

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