From patchwork Tue Aug 29 12:09:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabio Estevam X-Patchwork-Id: 719689 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 49F2FC83F1F for ; Tue, 29 Aug 2023 12:10:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233865AbjH2MKJ (ORCPT ); Tue, 29 Aug 2023 08:10:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45714 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233736AbjH2MJn (ORCPT ); Tue, 29 Aug 2023 08:09:43 -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 05F241AB; Tue, 29 Aug 2023 05:09:41 -0700 (PDT) Received: by mail-oa1-x2f.google.com with SMTP id 586e51a60fabf-1a2dd615ddcso912697fac.0; Tue, 29 Aug 2023 05:09:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1693310980; x=1693915780; 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=TzUUjWIr8T0FZIbu34J9BGxTroSGsDdkY4ko+SJQrnc=; b=A1pUETre5tdg0G0mCkuEDmy4RXfXoVCiPK8BP9Zk2ScIjVEg0wHFccq4IvvHXZzjcH TMeSXa7o1SoGYvzjS3aBjI902WCfI/PTtZ2cNHUR1o8vfXTzqKslGQaUEg/hO1cc0v3i ja0z+ev7TWav+syWR7HIYDzoQ5lF4S8xovd/jySoy4md02TwRQS8ZVgra+VCzsa5wQu0 fs5y/UVwz7TitMT0sZPC8PckpHwsB3a0A5nuHwjDaAJKZsc2Wbg56CAdBTjbMvQVfw91 KOjYlFI7t3ZjvccDeFLUnpIopjbB6He9vFcYHyMHz6f3vPcpYAjiB6K8P/hG3bJC/TaC RM+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693310980; x=1693915780; 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=TzUUjWIr8T0FZIbu34J9BGxTroSGsDdkY4ko+SJQrnc=; b=doC3kmpahhQGJSy62GRNRHvHD+j2rkf72aY5JsGAnG4minVN8S6oG/flYvkInMkhCg efnfOvqDvz07wrlng23i9jyG6pcwwV5f8Rch0jT8xxt5XSi6UbpCFNT5bi3qGyvKliWa Z8wFtlJjsRmLF4n1yx0u3dn5Jfoes57tOZU307hfscvAkYyrESehO0z4atAHYiOAkI4o qfma/HAOykQAvGt1nDt5VNza/ykZv6gSDnl46FJuAZhi9FJ2DYk94/ieg8kvfy2bD7Fk bL7PHDAQM8G1npuWXHTpCcubj7k4UYZAhyrcK/3FQJBNiXx2J/HispzuhFv/gNP+w21W XBgA== X-Gm-Message-State: AOJu0YxlYNVmKCdf1jARyZ5YE12vpX+wUvjtgzOkUcwlVOLANc9Cbk67 yN5amLhiQpJ3/LVbKAyXK0c= X-Google-Smtp-Source: AGHT+IHt8NP1HZ0CNe6b49MjjmGovhfJS84ptGTRXqIGozLkPeFRI3XCCI1LO8hhfE7boSGFIWgpHA== X-Received: by 2002:a05:6870:d10f:b0:1be:ec3c:1ef with SMTP id e15-20020a056870d10f00b001beec3c01efmr31988232oac.0.1693310980312; Tue, 29 Aug 2023 05:09:40 -0700 (PDT) Received: from fabio-Precision-3551.. ([2804:14c:485:4b61:d5ec:d929:1621:6cc6]) by smtp.gmail.com with ESMTPSA id zc17-20020a056871271100b001d0ad5205fesm2000651oab.7.2023.08.29.05.09.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Aug 2023 05:09:39 -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 v4 2/3] reboot: Introduce hw_protection_reboot() Date: Tue, 29 Aug 2023 09:09:23 -0300 Message-Id: <20230829120924.1711175-2-festevam@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230829120924.1711175-1-festevam@gmail.com> References: <20230829120924.1711175-1-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 v3: - 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 *