From mboxrd@z Thu Jan 1 00:00:00 1970 From: mark.rutland@arm.com (Mark Rutland) Date: Wed, 9 Jan 2013 14:46:07 +0000 Subject: [PATCHv2 1/4] clockevents: Add generic timer broadcast receiver In-Reply-To: <1357742770-15028-1-git-send-email-mark.rutland@arm.com> References: <1357742770-15028-1-git-send-email-mark.rutland@arm.com> Message-ID: <1357742770-15028-2-git-send-email-mark.rutland@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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. Signed-off-by: Mark Rutland Reviewed-by: Santosh Shilimkar Tested-by: Santosh Shilimkar --- include/linux/clockchips.h | 9 +++++++++ kernel/time/tick-broadcast.c | 12 ++++++++++++ 2 files changed, 21 insertions(+), 0 deletions(-) diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index 8a7096f..6537114 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -161,6 +161,15 @@ 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); +#else +static inline int tick_receive_broadcast(void) +{ + return 0; +} +#endif + #ifdef CONFIG_GENERIC_CLOCKEVENTS extern void clockevents_notify(unsigned long reason, void *arg); #else diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index f113755..5079bb7 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -125,6 +125,18 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) return ret; } +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; + + evt->event_handler(evt); + return 0; +} + /* * Broadcast the event to the cpus, which are set in the mask (mangled). */ -- 1.7.0.4