From patchwork Thu Nov 21 11:24:16 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 3217721 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B4ABBC045B for ; Thu, 21 Nov 2013 11:29:54 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AAAFD2074B for ; Thu, 21 Nov 2013 11:29:48 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 31CED20785 for ; Thu, 21 Nov 2013 11:29:47 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VjSQr-00032Q-6g; Thu, 21 Nov 2013 11:28:26 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VjSPw-0007Ro-Fw; Thu, 21 Nov 2013 11:27:28 +0000 Received: from service87.mimecast.com ([91.220.42.44]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VjSNp-0007G0-TV for linux-arm-kernel@lists.infradead.org; Thu, 21 Nov 2013 11:25:24 +0000 Received: from cam-owa1.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.21]) by service87.mimecast.com; Thu, 21 Nov 2013 11:24:58 +0000 Received: from red-moon.cambridge.arm.com ([10.1.255.212]) by cam-owa1.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.3959); Thu, 21 Nov 2013 11:24:56 +0000 From: Lorenzo Pieralisi To: linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org Subject: [PATCH RFC v3 09/12] arm64: enable generic clockevent broadcast Date: Thu, 21 Nov 2013 11:24:16 +0000 Message-Id: <1385033059-25896-10-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1385033059-25896-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1385033059-25896-1-git-send-email-lorenzo.pieralisi@arm.com> X-OriginalArrivalTime: 21 Nov 2013 11:24:56.0785 (UTC) FILETIME=[4E9ABC10:01CEE6AC] X-MC-Unique: 113112111245810101 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131121_062518_182216_55357991 X-CRM114-Status: GOOD ( 12.51 ) X-Spam-Score: -2.6 (--) Cc: Mark Rutland , Feng Kan , Stephen Boyd , Lorenzo Pieralisi , Russell King , Graeme Gregory , Nicolas Pitre , Marc Zyngier , Catalin Marinas , Yu Tang , Daniel Lezcano , Will Deacon , Christoffer Dall , Sudeep KarkadaNagesha , Santosh Shilimkar , Loc Ho , Colin Cross , Kumar Sankaran , Dave Martin , Hanjun Guo , Zhou Zhu X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On platforms with power management capabilities, timers that are shut down when a CPU enters deep C-states must be emulated using an always-on timer and a timer IPI to relay the timer IRQ to target CPUs on an SMP system. This patch enables the generic clockevents broadcast infrastructure for arm64, by providing the required Kconfig entries and adding the timer IPI infrastructure. Acked-by: Daniel Lezcano Signed-off-by: Lorenzo Pieralisi --- arch/arm64/Kconfig | 2 ++ arch/arm64/include/asm/hardirq.h | 2 +- arch/arm64/kernel/smp.c | 17 +++++++++++++++++ 3 files changed, 20 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 88c8b6c1..1d222b1 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2,6 +2,7 @@ config ARM64 def_bool y select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE select ARCH_USE_CMPXCHG_LOCKREF + select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_WANT_OPTIONAL_GPIOLIB select ARCH_WANT_COMPAT_IPC_PARSE_VERSION select ARCH_WANT_FRAME_POINTERS @@ -12,6 +13,7 @@ config ARM64 select CLONE_BACKWARDS select COMMON_CLK select GENERIC_CLOCKEVENTS + select GENERIC_CLOCKEVENTS_BROADCAST if SMP select GENERIC_IOMAP select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h index 990c051..ae4801d 100644 --- a/arch/arm64/include/asm/hardirq.h +++ b/arch/arm64/include/asm/hardirq.h @@ -20,7 +20,7 @@ #include #include -#define NR_IPI 4 +#define NR_IPI 5 typedef struct { unsigned int __softirq_pending; diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index a5aeefa..56b68d7 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -61,6 +61,7 @@ enum ipi_msg_type { IPI_CALL_FUNC, IPI_CALL_FUNC_SINGLE, IPI_CPU_STOP, + IPI_TIMER, }; /* @@ -446,6 +447,7 @@ static const char *ipi_types[NR_IPI] = { S(IPI_CALL_FUNC, "Function call interrupts"), S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"), S(IPI_CPU_STOP, "CPU stop interrupts"), + S(IPI_TIMER, "Timer broadcast interrupts"), }; void show_ipi_list(struct seq_file *p, int prec) @@ -531,6 +533,14 @@ void handle_IPI(int ipinr, struct pt_regs *regs) irq_exit(); break; +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST + case IPI_TIMER: + irq_enter(); + tick_receive_broadcast(); + irq_exit(); + break; +#endif + default: pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr); break; @@ -543,6 +553,13 @@ void smp_send_reschedule(int cpu) smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE); } +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +void tick_broadcast(const struct cpumask *mask) +{ + smp_cross_call(mask, IPI_TIMER); +} +#endif + void smp_send_stop(void) { unsigned long timeout;