From patchwork Mon Jun 13 13:59:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lecopzer Chen X-Patchwork-Id: 12879602 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 38DA2C43334 for ; Mon, 13 Jun 2022 14:11:27 +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=1xDH1lt2l0YY0jCeeVpNOANBAQutOJ5xaFJR7FMf17Y=; b=HDkeLjFiYbKdiL KmH/D4qGFAYIeQ5s7zx23mPJbu8Q/hZtBtGZ2hmuqYabHo8fOszO5FOBwBP5EoBepjeTYVGzyoYHS rBtlSwG2xavs2Pvhxp3aAy47OF+UJcQhwBYRSwXuE2eQmoqUDvCojIInRAB6of3+P873rn5ZJptWV g60R2s5qBsiB0wdTFbkZb72VxxJAObSuZC+l9jHydn6iZaoEFxhfzgzWVn4KrV2mBvL0Ydd847OdF 87OEQk4bkLb3ztjybCFIEPK5ibJJLVh/hvh8T7dN4sIOHGjyDdiB2PxzAg/TUS3G4XhH95WM/ghjJ ZV956Z4mN7n7hJP2toQg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o0kli-0046sP-33; Mon, 13 Jun 2022 14:10:14 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o0klf-0046qz-13; Mon, 13 Jun 2022 14:10:12 +0000 X-UUID: ba95c621a53c40bb9a226701e6dc8a1c-20220613 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.6,REQID:3a4171f7-e0c5-4bbc-b5ac-41e7b8c171f2,OB:0,LO B:0,IP:0,URL:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACT ION:release,TS:-5 X-CID-META: VersionHash:b14ad71,CLOUDID:904a69c6-12ba-4305-bfdf-9aefbdc32516,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:0,File:nil ,QS:nil,BEC:nil,COL:0 X-UUID: ba95c621a53c40bb9a226701e6dc8a1c-20220613 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 930592585; Mon, 13 Jun 2022 07:10:05 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 13 Jun 2022 07:00:02 -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 15.2.792.3; Mon, 13 Jun 2022 22:00:00 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.3 via Frontend Transport; Mon, 13 Jun 2022 22:00:00 +0800 From: Lecopzer Chen To: , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v5 4/6] kernel/watchdog: Adapt the watchdog_hld interface for async model Date: Mon, 13 Jun 2022 21:59:54 +0800 Message-ID: <20220613135956.15711-5-lecopzer.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220613135956.15711-1-lecopzer.chen@mediatek.com> References: <20220613135956.15711-1-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-20220613_071011_126966_19FE6CFA X-CRM114-Status: GOOD ( 21.32 ) 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 When lockup_detector_init()->watchdog_nmi_probe(), PMU may be not ready yet. E.g. on arm64, PMU is not ready until device_initcall(armv8_pmu_driver_init). And it is deeply integrated with the driver model and cpuhp. Hence it is hard to push this initialization before smp_init(). But it is easy to take an opposite approach and try to initialize the watchdog once again later. The delayed probe is called using workqueues. It need to allocate memory and must be proceed in a normal context. The delayed probe is able to use if watchdog_nmi_probe() returns non-zero which means the return code returned when PMU is not ready yet. Provide an API - retry_lockup_detector_init() for anyone who needs to delayed init lockup detector if they had ever failed at lockup_detector_init(). The original assumption is: nobody should use delayed probe after lockup_detector_check() which has __init attribute. That is, anyone uses this API must call between lockup_detector_init() and lockup_detector_check(), and the caller must have __init attribute Reviewed-by: Petr Mladek Co-developed-by: Pingfan Liu Signed-off-by: Pingfan Liu Signed-off-by: Lecopzer Chen Suggested-by: Petr Mladek Reported-by: kernel test robot Reported-by: kernel test robot --- include/linux/nmi.h | 2 ++ kernel/watchdog.c | 67 ++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 68 insertions(+), 1 deletion(-) diff --git a/include/linux/nmi.h b/include/linux/nmi.h index b7bcd63c36b4..10f2a305fe0d 100644 --- a/include/linux/nmi.h +++ b/include/linux/nmi.h @@ -118,6 +118,8 @@ static inline int hardlockup_detector_perf_init(void) { return 0; } void watchdog_nmi_stop(void); void watchdog_nmi_start(void); + +void retry_lockup_detector_init(void); int watchdog_nmi_probe(void); void watchdog_nmi_enable(unsigned int cpu); void watchdog_nmi_disable(unsigned int cpu); diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 458737bc4e35..654a193bcbaa 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -103,7 +103,13 @@ void __weak watchdog_nmi_disable(unsigned int cpu) hardlockup_detector_perf_disable(); } -/* Return 0, if a NMI watchdog is available. Error code otherwise */ +/* + * Arch specific API. + * + * Return 0 when NMI watchdog is available, negative value otherwise. + * Note that the negative value means that a delayed probe might + * succeed later. + */ int __weak __init watchdog_nmi_probe(void) { return hardlockup_detector_perf_init(); @@ -835,6 +841,62 @@ static struct ctl_table watchdog_sysctls[] = { {} }; +static void __init lockup_detector_delay_init(struct work_struct *work); +static bool allow_lockup_detector_init_retry __initdata; + +static struct work_struct detector_work __initdata = + __WORK_INITIALIZER(detector_work, lockup_detector_delay_init); + +static void __init lockup_detector_delay_init(struct work_struct *work) +{ + int ret; + + ret = watchdog_nmi_probe(); + if (ret) { + pr_info("Delayed init of the lockup detector failed: %d\n", ret); + pr_info("Perf NMI watchdog permanently disabled\n"); + return; + } + + allow_lockup_detector_init_retry = false; + + nmi_watchdog_available = true; + lockup_detector_setup(); +} + +/* + * retry_lockup_detector_init - retry init lockup detector if possible. + * + * Retry hardlockup detector init. It is useful when it requires some + * functionality that has to be initialized later on a particular + * platform. + */ +void __init retry_lockup_detector_init(void) +{ + /* Must be called before late init calls */ + if (!allow_lockup_detector_init_retry) + return; + + schedule_work(&detector_work); +} + +/* + * Ensure that optional delayed hardlockup init is proceed before + * the init code and memory is freed. + */ +static int __init lockup_detector_check(void) +{ + /* Prevent any later retry. */ + allow_lockup_detector_init_retry = false; + + /* Make sure no work is pending. */ + flush_work(&detector_work); + + return 0; + +} +late_initcall_sync(lockup_detector_check); + static void __init watchdog_sysctl_init(void) { register_sysctl_init("kernel", watchdog_sysctls); @@ -853,6 +915,9 @@ void __init lockup_detector_init(void) if (!watchdog_nmi_probe()) nmi_watchdog_available = true; + else + allow_lockup_detector_init_retry = true; + lockup_detector_setup(); watchdog_sysctl_init(); }