From patchwork Tue Nov 29 14:03:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 629278 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6D2C5C4708A for ; Tue, 29 Nov 2022 14:03:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234642AbiK2ODl (ORCPT ); Tue, 29 Nov 2022 09:03:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234702AbiK2ODd (ORCPT ); Tue, 29 Nov 2022 09:03:33 -0500 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F2EFA15838 for ; Tue, 29 Nov 2022 06:03:31 -0800 (PST) Received: by mail-pj1-x1033.google.com with SMTP id t17so12748621pjo.3 for ; Tue, 29 Nov 2022 06:03:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=dmATt0XXLfjGq8KTAB6LQCwLbX+al5xHeC21A61DKj0=; b=hY/6z86R84EwODbjkiiGC6QK0QG6Br2dUspKKN2xxrJ8I9quSTGKQCLag9z6OAVc5U EATKmpotnBhW0OItmcD9+yaySF26TlP5OjXCEIpBptR7dWma01PR8ptk7OemJ66JbquV Lb+PnPKW6yYk7VWlNMmwkLfSvnLEfccmBsdRACeew8SunS8mKXTJtt7wCEbM+WTstp9Z Tv880hcMAeQY8/X4jWNG5kueNio+R32G6GlAnPPkSudTu8fBS2MKf4j9utmOa0AYl5vL w7M/n4cIsxQfcp57UyuMiKkFo6dRWmxjFWQ5FM6+Al2cicW24t2uEeZKqUm2/PHm5el3 wYHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=dmATt0XXLfjGq8KTAB6LQCwLbX+al5xHeC21A61DKj0=; b=xGKlNW1a3Hdg0Tg/y36XO+ybHEOjmNQYRXEceqOr4GSscSD5WMgzRBqWSLrCattAAs rfdkKPB25srEeMx6ThoPMIWftH4ROxT+3RwbxKiyK+gYwP6IWJIrwxS4pXEREhr4LNeA g6rS8HpQmKXjlCGzCfXVKB2EXFoiKnh1mbPZCz1m7E2/kMyCgKQuL9FC+xftPbdLrVid ua0vqsdmIfVROs2g7vn7gBxzhUBMk9YE06K+imJ4ctlRDzYCMMUnuafmnY5Mmbc9dFr/ RmRtFl7+uqenehYNzgwLp4tHbuAE8QO1qzkCiLWyQOmdBwW73mc+/f8b/NxdYG282amZ cNHA== X-Gm-Message-State: ANoB5plemgfdGevpz+uiTRPvrfvH/86Cr9K7xqxnlQMktwX6Q8Gpz51n cwafu7ldWXifPf9CpT7EZF8kaA== X-Google-Smtp-Source: AA0mqf53M2VbsnM+2H/qCK2bbZJbD9dskoicTq7vf6i7UsemhtdUPZBj0ZAKIkhFlUctXmNdwVz6fQ== X-Received: by 2002:a17:902:70c9:b0:176:a0cc:5eff with SMTP id l9-20020a17090270c900b00176a0cc5effmr46522128plt.128.1669730607996; Tue, 29 Nov 2022 06:03:27 -0800 (PST) Received: from anup-ubuntu-vm.localdomain ([171.76.84.98]) by smtp.gmail.com with ESMTPSA id k30-20020aa79d1e000000b00574f83c5d51sm6013747pfp.198.2022.11.29.06.03.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Nov 2022 06:03:27 -0800 (PST) From: Anup Patel To: Rob Herring , Krzysztof Kozlowski , Palmer Dabbelt , Paul Walmsley , Daniel Lezcano , Thomas Gleixner Cc: Andrew Jones , Atish Patra , Samuel Holland , Conor Dooley , Anup Patel , devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/3] RISC-V: time: initialize broadcast hrtimer based clock event device Date: Tue, 29 Nov 2022 19:33:11 +0530 Message-Id: <20221129140313.886192-2-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221129140313.886192-1-apatel@ventanamicro.com> References: <20221129140313.886192-1-apatel@ventanamicro.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Conor Dooley Similarly to commit 022eb8ae8b5e ("ARM: 8938/1: kernel: initialize broadcast hrtimer based clock event device"), RISC-V needs to initiate hrtimers before C3STOP can be used. Otherwise, the introduction of C3STOP for the RISC-V arch timer in commit 232ccac1bd9b ("clocksource/drivers/riscv: Events are stopped during CPU suspend") breaks timer behaviour, for example clock_nanosleep(). A test app that sleeps each cpu for 6, 5, 4, 3 ms respectively, HZ=250 & C3STOP enabled, the sleep times are rounded up to the next jiffy: == CPU: 1 == == CPU: 2 == == CPU: 3 == == CPU: 4 == Mean: 7.974992 Mean: 7.976534 Mean: 7.962591 Mean: 3.952179 Std Dev: 0.154374 Std Dev: 0.156082 Std Dev: 0.171018 Std Dev: 0.076193 Hi: 9.472000 Hi: 10.495000 Hi: 8.864000 Hi: 4.736000 Lo: 6.087000 Lo: 6.380000 Lo: 4.872000 Lo: 3.403000 Samples: 521 Samples: 521 Samples: 521 Samples: 521 Link: https://lore.kernel.org/linux-riscv/YzYTNQRxLr7Q9JR0@spud/ Fixes: 232ccac1bd9b ("clocksource/drivers/riscv: Events are stopped during CPU suspend") Suggested-by: Samuel Holland Signed-off-by: Conor Dooley --- arch/riscv/kernel/time.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c index 8217b0f67c6c..1cf21db4fcc7 100644 --- a/arch/riscv/kernel/time.c +++ b/arch/riscv/kernel/time.c @@ -5,6 +5,7 @@ */ #include +#include #include #include #include @@ -29,6 +30,8 @@ void __init time_init(void) of_clk_init(NULL); timer_probe(); + + tick_setup_hrtimer_broadcast(); } void clocksource_arch_init(struct clocksource *cs)