From patchwork Mon Aug 28 19:59:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabio Estevam X-Patchwork-Id: 718093 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 D01E3C83F1C for ; Mon, 28 Aug 2023 20:01:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233553AbjH1UAu (ORCPT ); Mon, 28 Aug 2023 16:00:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34730 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233619AbjH1UAN (ORCPT ); Mon, 28 Aug 2023 16:00:13 -0400 Received: from mail-oi1-x229.google.com (mail-oi1-x229.google.com [IPv6:2607:f8b0:4864:20::229]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EDBBFCC6; Mon, 28 Aug 2023 12:59:36 -0700 (PDT) Received: by mail-oi1-x229.google.com with SMTP id 5614622812f47-3a88b1e18f2so375125b6e.0; Mon, 28 Aug 2023 12:59:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1693252776; x=1693857576; 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=+uusCkjysh/AWlACw3hz3AZGWKR8hyQooItcfr6OYtE=; b=RwUICWutMxoFD5F9l7TFpPCuX27np4Awc2zvuZHTIS/zXHQ2V2Y0Dovw3AYtCbcrfW ke4Y04GU35bo9y5TmHsIVErEWGDAafOx9E8RdM0vTW4KfdehQHzkkUKod18oV1A3wG85 viV4aQK+ZXE3bMOfvWJ0V14b/Gc5qmLYZBPKoW6gP6daRy2vqMWXGfS49SE0wYtjFNAD 9uGgvBMAga8pwrNuaAsiDHRDiWdReqDPD+2Hdl88vBz+ZOsySWXSOP2vI8swtOqh1hDl 63qEV9yQAtm4qkCshHOCnoCwTW+WhDfbm5VBqDabcJwhIF4BzAqs58EaAUA4mHI2MCqI Lzwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693252776; x=1693857576; 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=+uusCkjysh/AWlACw3hz3AZGWKR8hyQooItcfr6OYtE=; b=NN8oturM82KIWwCAaY7tXm1wN+iSbmXUJZ1qD/3GXpHI13CKOfFMj3H5zPT6sDzw+J rLwu+kmKT6YpjGQszZNiUI5rR+SkPMcTK7Ar5Ok/ls5Czlzp6mghHHetQfuaokk/TEPI NaEf0Osh06Dgxl6KR5vVANhtNSDpmrOBbyTfrAqbetHlRC41Lh3PD1hVHKJKNadRIQ7G mDc1rVptYc+TLHk9QHZrqcz7qdngEgwFdezzyHWBHFXSL9M0nlVmVmvMSedPYKiSStAb z+pivAN1hFq9PRQ2a8NSllrfRj6XULKVO+4RDhMxNiAQqeCEXuAbaAaOqFKT6u8M/wgO VDhQ== X-Gm-Message-State: AOJu0YxG449t64BW9TW0N9ccMXSgLkF56jhdGaXtmHNH4uvegYWraqGd quugmTFSc7zdYb1dpJ8VKrY= X-Google-Smtp-Source: AGHT+IE4q8i2r5ispwNleag74zJQEZfnsyLE5ldHdxwY+lORwPvmF8qc6REXfqBuoGQ/3kzDShWbdA== X-Received: by 2002:a05:6808:1599:b0:3a8:7446:7aba with SMTP id t25-20020a056808159900b003a874467abamr19596256oiw.5.1693252776235; Mon, 28 Aug 2023 12:59:36 -0700 (PDT) Received: from fabio-Precision-3551.. ([2804:14c:485:4b61:3c37:a69d:a4cd:94fc]) by smtp.gmail.com with ESMTPSA id k24-20020a544698000000b003a9a2362f66sm2254341oic.16.2023.08.28.12.59.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Aug 2023 12:59:35 -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 v3 2/3] reboot: Introduce hw_protection_reboot() Date: Mon, 28 Aug 2023 16:59:01 -0300 Message-Id: <20230828195902.1645169-2-festevam@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230828195902.1645169-1-festevam@gmail.com> References: <20230828195902.1645169-1-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 v2: - 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 *