From patchwork Tue Aug 29 19:41:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabio Estevam X-Patchwork-Id: 718405 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 65B22C83F19 for ; Tue, 29 Aug 2023 19:42:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230393AbjH2TmV (ORCPT ); Tue, 29 Aug 2023 15:42:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47154 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231171AbjH2TmP (ORCPT ); Tue, 29 Aug 2023 15:42:15 -0400 Received: from mail-ot1-x32a.google.com (mail-ot1-x32a.google.com [IPv6:2607:f8b0:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C5DDCC; Tue, 29 Aug 2023 12:42:11 -0700 (PDT) Received: by mail-ot1-x32a.google.com with SMTP id 46e09a7af769-6bca018afe8so1224683a34.0; Tue, 29 Aug 2023 12:42:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1693338130; x=1693942930; darn=vger.kernel.org; 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=tLNBwMKv5VU8YZb3FI/dbw928xvMZfMLOw7sqi25S4g=; b=jVBrhGpCR5kfWJpouCM/w58qlTICxVdObSuxrxg9gX+zeuHH8ybbfUNwz09X49PfId vAcjhobVB+waaoh1RqJF1ZRDsaKQrctm7d9aieuS0PT5K7R1lwP9tttIHGiUZkCnDF0h fyX7nUFuVMRiTprrgk48MQ4SX+7j/FK823ZVDuNbqJQtKZrRc3o1D8UfEXm8mOeDHG0X DzP81j5xtVn6jo+KIeW0mVAoxoZFzmwHcNuIDZ6xpP8RB5ztIwrSq6Hg/GBE5tLiDGoz J/nyUX8kGLwZgG+AGjtroF3Pcuy9BQIxRfxig+n2+49oaH9rRlCbi3qfInCP9baNe9i9 TZVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693338130; x=1693942930; 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=tLNBwMKv5VU8YZb3FI/dbw928xvMZfMLOw7sqi25S4g=; b=A17cTBABQiTfyDsurtR3W6QfRi6OKnZeb9aY1DPtSK9bGpFMPo7LR0GO12kqQ7yWRi LeWpnS3lEWnEDATtrvpM+hIdmqNylZTgRMG5MipQ0rXujnRuYpNZm465JrInDyZ0FQ20 YG4BTal39dsM+cgLcSTG48TZCE63uzYc20ISPLV2QaYaXCvM0J4kL9KvrWhoLNJXgUev 40b1a3c8BgAK24ZOU+X//moTAeu4fG+fymUcPDYH2eIFlAJqlpGW3nkpmrnuRkAxi3jv GiX6EI+n2nKTuoF6bACcB7U22xHeXyl2h1yki8INxqttoXQHrX7iImOo8loHZwT5mOqX 9yAw== X-Gm-Message-State: AOJu0YxRfIVVhTEVSOVy5xLT0v2Mq8vHkA/Ql7ugnO4xD7BEIWF6xN7P H+xJdl46Dyp+FNruMi62ZtM= X-Google-Smtp-Source: AGHT+IEW1DfCl+fssuhVpfvEM/oibGLC5msOljLh8oV3hTrEg7N3c0mle5PwQjNFooDNjmrWkzJOaA== X-Received: by 2002:a05:6830:460b:b0:6be:ed61:a4a8 with SMTP id ba11-20020a056830460b00b006beed61a4a8mr111777otb.2.1693338130500; Tue, 29 Aug 2023 12:42:10 -0700 (PDT) Received: from fabio-Precision-3551.. ([2804:14c:485:4b61:d5ec:d929:1621:6cc6]) by smtp.gmail.com with ESMTPSA id c21-20020a9d7855000000b006b9848f8aa7sm4905457otm.45.2023.08.29.12.42.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Aug 2023 12:42:10 -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 v5 2/3] reboot: Introduce hw_protection_reboot() Date: Tue, 29 Aug 2023 16:41:59 -0300 Message-Id: <20230829194200.1901988-2-festevam@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230829194200.1901988-1-festevam@gmail.com> References: <20230829194200.1901988-1-festevam@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@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 v4: - 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 *