From patchwork Sat Sep 3 09:34:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lecopzer Chen X-Patchwork-Id: 12964955 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 74E0EECAAD4 for ; Sat, 3 Sep 2022 10:06:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=52qnC0JfPaFXf4AprvDAqrv0sgHhkWq0NXwcxzPz+K4=; b=gVkHv3A+Tw/hFH palHhtljoj5RZ8EJ/gjKlO0vMx9UV620Z62FEYc0Zo7hl9CJhfAS48DnFv8lF6kq/ecYV+GWxgXZT adr9gv5EesglqCjVR1G24HZccfR3/wVwweh4wMmSk12ysngqJjlBnhyUkaRniJNAMeMvyj+BH9R0x wB830Vd/pk4gNf+apYnc5joUokjpLIexMcZONSBGUl6gYmBCO3daMMH7n+0RbAwyC769DSf84FGdF CrpcirCnMDB4V0k0i77w2a/a/gYAZie8g0k9xWT7mlUPIIsQxGQqg+KoMgjgYRg1z9xDbsQO+VBvn F2Bqoz+D8zJDxGtkxt/Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oUQ0s-008ZlI-1B; Sat, 03 Sep 2022 10:04:30 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oUQ0o-008Zjx-3a for linux-arm-kernel@lists.infradead.org; Sat, 03 Sep 2022 10:04:27 +0000 X-UUID: 1588327457d44598a220e0f9d0174831-20220903 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=A8yIwoxK4eYldHiTtkcfKhmHsWy3i5NwjecUCyK1Fsk=; b=Z/E52dhvG/c7f9Dp38wte/TbAFuThHbhJg5zI4UcTVOgmNmGc6yGkm+FlNfkXrS6bgvZPujSF1QRAf5pFM9KEcl38nb91zYEHtYzBSLk21PX0NZYZcCp4ayOQt+grh7VyAmDmKE/e9hf5jXp+7xPni4YSVs9fFf3qKiudalV9Zg=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.10,REQID:0ec7fc63-1f6b-4da5-9f3a-e38f952664b0,OB:0,L OB:0,IP:0,URL:0,TC:0,Content:-25,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Releas e_Ham,ACTION:release,TS:-25 X-CID-META: VersionHash:84eae18,CLOUDID:fbbc0521-1c20-48a5-82a0-25f9c331906d,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:1,File:nil ,Bulk:nil,QS:nil,BEC:nil,COL:0 X-UUID: 1588327457d44598a220e0f9d0174831-20220903 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 424667828; Sat, 03 Sep 2022 03:04:22 -0700 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs11n1.mediatek.inc (172.21.101.185) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.15; Sat, 3 Sep 2022 17:34:18 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.15 via Frontend Transport; Sat, 3 Sep 2022 17:34:17 +0800 From: Lecopzer Chen To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v7 5/6] arm64: add hw_nmi_get_sample_period for preparation of lockup detector Date: Sat, 3 Sep 2022 17:34:14 +0800 Message-ID: <20220903093415.15850-6-lecopzer.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220903093415.15850-1-lecopzer.chen@mediatek.com> References: <20220903093415.15850-1-lecopzer.chen@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220903_030426_172001_1694AC33 X-CRM114-Status: GOOD ( 15.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Set safe maximum CPU frequency to 5 GHz in case a particular platform doesn't implement cpufreq driver. Although, architecture doesn't put any restrictions on maximum frequency but 5 GHz seems to be safe maximum given the available Arm CPUs in the market which are clocked much less than 5 GHz. On the other hand, we can't make it much higher as it would lead to a large hard-lockup detection timeout on parts which are running slower (eg. 1GHz on Developerbox) and doesn't possess a cpufreq driver. [1]:http://lore.kernel.org/linux-arm-kernel/1610712101-14929-1-git-send-email-sumit.garg@linaro.org Co-developed-by: Sumit Garg Signed-off-by: Sumit Garg Co-developed-by: Pingfan Liu Signed-off-by: Pingfan Liu Signed-off-by: Lecopzer Chen --- arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/watchdog_hld.c | 25 +++++++++++++++++++++++++ 2 files changed, 26 insertions(+) create mode 100644 arch/arm64/kernel/watchdog_hld.c diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 1add7b01efa7..122b50bfcc0e 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_ARM64_MODULE_PLTS) += module-plts.o obj-$(CONFIG_PERF_EVENTS) += perf_regs.o perf_callchain.o obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o +obj-$(CONFIG_HARDLOCKUP_DETECTOR_PERF) += watchdog_hld.o obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o obj-$(CONFIG_CPU_PM) += sleep.o suspend.o obj-$(CONFIG_CPU_IDLE) += cpuidle.o diff --git a/arch/arm64/kernel/watchdog_hld.c b/arch/arm64/kernel/watchdog_hld.c new file mode 100644 index 000000000000..de43318e4dd6 --- /dev/null +++ b/arch/arm64/kernel/watchdog_hld.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +#include + +/* + * Safe maximum CPU frequency in case a particular platform doesn't implement + * cpufreq driver. Although, architecture doesn't put any restrictions on + * maximum frequency but 5 GHz seems to be safe maximum given the available + * Arm CPUs in the market which are clocked much less than 5 GHz. On the other + * hand, we can't make it much higher as it would lead to a large hard-lockup + * detection timeout on parts which are running slower (eg. 1GHz on + * Developerbox) and doesn't possess a cpufreq driver. + */ +#define SAFE_MAX_CPU_FREQ 5000000000UL // 5 GHz +u64 hw_nmi_get_sample_period(int watchdog_thresh) +{ + unsigned int cpu = smp_processor_id(); + unsigned long max_cpu_freq; + + max_cpu_freq = cpufreq_get_hw_max_freq(cpu) * 1000UL; + if (!max_cpu_freq) + max_cpu_freq = SAFE_MAX_CPU_FREQ; + + return (u64)max_cpu_freq * watchdog_thresh; +} +