From patchwork Mon Aug 28 14:13:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabio Estevam X-Patchwork-Id: 718523 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 A3E08C83F19 for ; Mon, 28 Aug 2023 14:15:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231569AbjH1OOb (ORCPT ); Mon, 28 Aug 2023 10:14:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47680 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231741AbjH1OOT (ORCPT ); Mon, 28 Aug 2023 10:14:19 -0400 Received: from mail-oa1-x2f.google.com (mail-oa1-x2f.google.com [IPv6:2001:4860:4864:20::2f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E0DD0E7; Mon, 28 Aug 2023 07:14:15 -0700 (PDT) Received: by mail-oa1-x2f.google.com with SMTP id 586e51a60fabf-1c134602a55so651791fac.1; Mon, 28 Aug 2023 07:14:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1693232055; x=1693836855; 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=h/y/OzGht6uESn/2y+kml2L9EOpmzM5vaL1ZN2yoFwo=; b=jw3RgLfCpPX5dRMkXX5b4sSdkK4s5HaEZfTlQmSGfzASFHDCkKp8x29FB4oS6HXMGl jE1TAUt723+APcpkVlCFDxss3qEbS7gsgCPHOUDXkqj108kn0kH+6QZLFEgCPcKpOPF6 ilAnaFbzbYUnzORaKvfsroGwXSLZO0qGrso4fEWWn8gCAsZYnmzPpeR2tDT/P7ybgnBL +liHIlxAh+g8u7jfZu6ugAiu8k/aPM0crVNzIblOwX3NIEJystRJtEwORY34L+WAD52D Ykpei2+AWbxX9m3pTYxXUtANtjXTThigZ0ZVJlWS0uRn28s3mLviVA8Z6p4FhA4ymFNu 4lwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693232055; x=1693836855; 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=h/y/OzGht6uESn/2y+kml2L9EOpmzM5vaL1ZN2yoFwo=; b=Rv1Tsf9FQRpOdcsSxSDgW+7VtTpoArLr104hOn7gGuonVpG1UfDE1rmYBfseFGUw5M O+wZvNxDzDIdryLO77NdohFmcMoM8cRDTRFNQvBOKUOkxg6ri6zHlPTVBfH2szmVsDuV y1lNmAWGZWcqb3rld1eaQvXhOPNIgzaMoBcpaRxzzHVz03iUP9MsdFhIZ04BqD+PRiQd v1WVd0aQBwMoSD/xlUmkfaeFCzfqP3PvMOCFdw+TNQixuhX61tueJO8cOy+p07K0wmsN jvqxxcVdKNbkk8fezRtWtMX0wvykQg9Wy7CvQ+ceXg5RZnMjliENKH0l5xl1HGI+KOQ8 NZLQ== X-Gm-Message-State: AOJu0YyvrPZccyS61OHM9igH7516j6ynBRl1q/K5JKVxq6V3n+NKmdtC DTVS1h0imXF/3Uf6vWeN+UM= X-Google-Smtp-Source: AGHT+IHglFtV417hZYXfWoZR1GwzLic9Cb8ps9koJ0Sivvi9nfcZM6uCmgTI7wh1uyvxSNxZlK+4vg== X-Received: by 2002:a05:6870:6124:b0:1b7:5e47:5b75 with SMTP id s36-20020a056870612400b001b75e475b75mr28734986oae.4.1693232055060; Mon, 28 Aug 2023 07:14:15 -0700 (PDT) Received: from fabio-Precision-3551.. ([2804:14c:485:4b61:3c37:a69d:a4cd:94fc]) by smtp.gmail.com with ESMTPSA id l5-20020a056870e90500b001c4ede43955sm4323892oan.31.2023.08.28.07.14.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Aug 2023 07:14:14 -0700 (PDT) From: Fabio Estevam To: daniel.lezcano@linaro.org Cc: rafael@kernel.org, amitk@kernel.org, rui.zhang@intel.com, linux-pm@vger.kernel.org, krzysztof.kozlowski+dt@linaro.org, robh+dt@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, Fabio Estevam Subject: [PATCH v2 2/3] reboot: Introduce hw_protection_reboot() Date: Mon, 28 Aug 2023 11:13:40 -0300 Message-Id: <20230828141341.1583591-2-festevam@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230828141341.1583591-1-festevam@gmail.com> References: <20230828141341.1583591-1-festevam@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Fabio Estevam Introduce hw_protection_reboot() to trigger an emergency reboot. It is a counterpart of hw_protection_shutdown() with the difference that it will force a reboot instead of shutdown. The motivation for doing this is to allow the thermal subystem to trigger a reboot when the temperature reaches the critical temperature. Signed-off-by: Fabio Estevam --- Changes since v1: - None include/linux/reboot.h | 1 + kernel/reboot.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/include/linux/reboot.h b/include/linux/reboot.h index 2b6bb593be5b..4a319bc24f6a 100644 --- a/include/linux/reboot.h +++ b/include/linux/reboot.h @@ -174,6 +174,7 @@ void ctrl_alt_del(void); extern void orderly_poweroff(bool force); extern void orderly_reboot(void); +void hw_protection_reboot(const char *reason, int ms_until_forced); void hw_protection_shutdown(const char *reason, int ms_until_forced); /* diff --git a/kernel/reboot.c b/kernel/reboot.c index 3bba88c7ffc6..05333ae8bc6b 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -952,6 +952,40 @@ static void hw_failure_emergency_poweroff(int poweroff_delay_ms) msecs_to_jiffies(poweroff_delay_ms)); } +/** + * hw_protection_reboot - Trigger an emergency system reboot + * + * @reason: Reason of emergency reboot to be printed. + * @ms_until_forced: Time to wait for orderly reboot before tiggering a + * forced reboot. Negative value disables the forced + * reboot. + * + * Initiate an emergency system reboot in order to protect hardware from + * further damage. Usage examples include a thermal protection. + * + * NOTE: The request is ignored if protection reboot is already pending even + * if the previous request has given a large timeout for forced reboot. + * Can be called from any context. + */ +void hw_protection_reboot(const char *reason, int ms_until_forced) +{ + static atomic_t allow_proceed = ATOMIC_INIT(1); + + pr_emerg("HARDWARE PROTECTION reboot (%s)\n", reason); + + /* Reboot should be initiated only once. */ + if (!atomic_dec_and_test(&allow_proceed)) + return; + + /* + * Queue a backup emergency reboot in the event of + * orderly_reboot failure + */ + hw_failure_emergency_poweroff(ms_until_forced); + orderly_reboot(); +} +EXPORT_SYMBOL_GPL(hw_protection_reboot); + /** * hw_protection_shutdown - Trigger an emergency system poweroff *