From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754751Ab2LRMHx (ORCPT ); Tue, 18 Dec 2012 07:07:53 -0500 Received: from service87.mimecast.com ([91.220.42.44]:40911 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754707Ab2LRMHo (ORCPT ); Tue, 18 Dec 2012 07:07:44 -0500 From: Mark Rutland To: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux@arm.linux.org.uk, tglx@linutronix.de, nico@linaro.org, will.deacon@arm.com, marc.zyngier@arm.com, john.stultz@linaro.org, Mark Rutland Subject: [RFC PATCH 2/5] clockevents: Add generic timer broadcast receiver Date: Tue, 18 Dec 2012 12:06:55 +0000 Message-Id: <1355832418-31692-3-git-send-email-mark.rutland@arm.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1355832418-31692-1-git-send-email-mark.rutland@arm.com> References: <1355832418-31692-1-git-send-email-mark.rutland@arm.com> X-OriginalArrivalTime: 18 Dec 2012 12:07:34.0328 (UTC) FILETIME=[43655380:01CDDD18] X-MC-Unique: 112121812074221701 Content-Type: text/plain; charset=WINDOWS-1252 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id qBIC7sWm018309 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 --- include/linux/clockchips.h | 4 ++++ kernel/time/tick-broadcast.c | 15 +++++++++++++++ 2 files changed, 19 insertions(+), 0 deletions(-) diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index 8a7096f..e1089aa 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -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 diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index f113755..c2dd022 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -125,6 +125,21 @@ 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; + + if (!evt->event_handler) + return -EINVAL; + + evt->event_handler(evt); + return 0; +} + /* * Broadcast the event to the cpus, which are set in the mask (mangled). */ -- 1.7.0.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: mark.rutland@arm.com (Mark Rutland) Date: Tue, 18 Dec 2012 12:06:55 +0000 Subject: [RFC PATCH 2/5] clockevents: Add generic timer broadcast receiver In-Reply-To: <1355832418-31692-1-git-send-email-mark.rutland@arm.com> References: <1355832418-31692-1-git-send-email-mark.rutland@arm.com> Message-ID: <1355832418-31692-3-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 --- include/linux/clockchips.h | 4 ++++ kernel/time/tick-broadcast.c | 15 +++++++++++++++ 2 files changed, 19 insertions(+), 0 deletions(-) diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index 8a7096f..e1089aa 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -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 diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index f113755..c2dd022 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -125,6 +125,21 @@ 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; + + if (!evt->event_handler) + return -EINVAL; + + evt->event_handler(evt); + return 0; +} + /* * Broadcast the event to the cpus, which are set in the mask (mangled). */ -- 1.7.0.4