From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 69A0BC43381 for ; Sun, 7 Mar 2021 02:26:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 230726505D for ; Sun, 7 Mar 2021 02:26:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230173AbhCGCZm (ORCPT ); Sat, 6 Mar 2021 21:25:42 -0500 Received: from mail.kernel.org ([198.145.29.99]:37972 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229957AbhCGCZK (ORCPT ); Sat, 6 Mar 2021 21:25:10 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2295F65056; Sun, 7 Mar 2021 02:25:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1615083910; bh=WhlbkUebwc1GJfXvE/1rpEg/Mf21MpRw1uus7X8kdhM=; h=From:To:Cc:Subject:Date:From; b=P/PmwbHZ6rBXncMvOhHWf1UeeMdm+EzqFTqXWkT46ndkYAfO1qnLQxRFvfotu3sJY Kh5z/TnOtYx6WabQsMWEtpP5NJtcFjN9r9dSYGTnJTR8TziqKn0M45t2L73ISLmSSw 8DJVqyWu6l4pssJWUlB2uAn4XSept9KW85JTvRzM0joP4Aal2p2RvdOI+Bx2koToGu Jkew5iPqShZCoORlTR9AwEYJqPKBz23lIfW6nDs7TrTkx/sL/jfKTIhJjam+DJJb1B 6a7qVm1pZEvrAU51xaXZoFodiLSwNiuf5JDqNfxfjo10vqlIz7G5Mx70WXjz4D6Hve 5Wtbn7puahsJQ== From: guoren@kernel.org To: arnd@arndb.de, guoren@kernel.org Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren , Thomas Gleixner , Daniel Lezcano Subject: [PATCH 1/2] csky: Enable generic clockevent broadcast Date: Sun, 7 Mar 2021 10:24:45 +0800 Message-Id: <20210307022446.63732-1-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Guo Ren When percpu-timers are stopped by deep power saving mode, we need system timer help to broadcast IPI_TIMER. This is first introduced by broken x86 hardware, where the local apic timer stops in C3 state. But many other architectures(powerpc, mips, arm, hexagon, openrisc, sh) have supported the infrastructure to deal with Power Management issues. Signed-off-by: Guo Ren Cc: Arnd Bergmann Cc: Thomas Gleixner Cc: Daniel Lezcano --- arch/csky/Kconfig | 2 ++ arch/csky/kernel/smp.c | 17 +++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig index 34e91224adc3..4328511ac050 100644 --- a/arch/csky/Kconfig +++ b/arch/csky/Kconfig @@ -6,6 +6,7 @@ config CSKY select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_SYNC_DMA_FOR_CPU select ARCH_HAS_SYNC_DMA_FOR_DEVICE + select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_QUEUED_RWLOCKS select ARCH_WANT_FRAME_POINTERS if !CPU_CK610 @@ -19,6 +20,7 @@ config CSKY select IRQ_DOMAIN select HANDLE_DOMAIN_IRQ select DW_APB_TIMER_OF + select GENERIC_CLOCKEVENTS_BROADCAST if SMP select GENERIC_IOREMAP select GENERIC_LIB_ASHLDI3 select GENERIC_LIB_ASHRDI3 diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c index 0f9f5eef9338..76d38d84da70 100644 --- a/arch/csky/kernel/smp.c +++ b/arch/csky/kernel/smp.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -32,6 +33,7 @@ enum ipi_message_type { IPI_RESCHEDULE, IPI_CALL_FUNC, IPI_IRQ_WORK, + IPI_TIMER, IPI_MAX }; @@ -67,6 +69,13 @@ static irqreturn_t handle_ipi(int irq, void *dev) irq_work_run(); } +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST + if (ops & (1 << IPI_TIMER)) { + stats[IPI_TIMER]++; + tick_receive_broadcast(); + } +#endif + BUG_ON((ops >> IPI_MAX) != 0); } @@ -102,6 +111,7 @@ static const char * const ipi_names[] = { [IPI_RESCHEDULE] = "Rescheduling interrupts", [IPI_CALL_FUNC] = "Function call interrupts", [IPI_IRQ_WORK] = "Irq work interrupts", + [IPI_TIMER] = "Timer broadcast interrupts", }; int arch_show_interrupts(struct seq_file *p, int prec) @@ -130,6 +140,13 @@ void arch_send_call_function_single_ipi(int cpu) send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC); } +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +void tick_broadcast(const struct cpumask *mask) +{ + send_ipi_message(mask, IPI_TIMER); +} +#endif + static void ipi_stop(void *unused) { while (1); -- 2.25.1