From patchwork Fri Aug 25 10:24:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabio Estevam X-Patchwork-Id: 717278 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 CEB2AC3DA6F for ; Fri, 25 Aug 2023 10:26:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236587AbjHYK03 (ORCPT ); Fri, 25 Aug 2023 06:26:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46412 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244486AbjHYK0G (ORCPT ); Fri, 25 Aug 2023 06:26:06 -0400 Received: from mail-ot1-x334.google.com (mail-ot1-x334.google.com [IPv6:2607:f8b0:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59A2C19A0; Fri, 25 Aug 2023 03:26:01 -0700 (PDT) Received: by mail-ot1-x334.google.com with SMTP id 46e09a7af769-6bc57401cb9so113983a34.0; Fri, 25 Aug 2023 03:26:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1692959160; x=1693563960; 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=iLr5gK3Lt46knsg3WNaCXteFlAoEoVQYH/7az4C+2/c=; b=qsdKwZRbm3hkdgX6kSfwJ0zI1Xc2UQOzpf5hgfvFh/OG9Z5Xv5RY27B1MUi8rDdglt C1C9bkHOR/jlPOjy1oDaiXFacGrM8StXyGTzAWZBMOeM/DKz/P+HvmiagcYtbBCcULBb Sp4zdQ/4AubMNSiFybmN9PxJk7JvGpXK3SQrs/dut6L+/zIDPGzD2WsYC3y2heswXYUG j4EgOCsrC3KxTmcUrG6qFOidPm0FZlqf/YdOZDVHdZehIr4Z7HjdImpa4B0z+fOl6fLZ ciSz2ri9HlZ4tuSGGe/EXmoexNzmrmccywrP5ynFTt3/PiXThycatpMORTnty3aQdKIp jEAg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692959160; x=1693563960; 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=iLr5gK3Lt46knsg3WNaCXteFlAoEoVQYH/7az4C+2/c=; b=LGtzZ+AK+wTiDKSmRnWizMTTnSp6H1ynouTNuKVAcwYHl+f+9YgUsekp68FmI7rG+L jklz1U1jYk3R2+RntvHWeqVuvjc4W7EgGXFzOzHY5eVsK8FKB6q8Vb++domtQ/GtfsEK //b1gEaT6QIsZe6aCFSpOuymbO1KNGU92I/wbDnCw7L42qXAznjRYvX87GlUYDsB9mOF Ohlg/mCTdl8kqOwtukAdEqGsepp0/Xiny0Xi1epMqGGvt6p9fPLPEnw7wuUCO8Fv17O/ Gtt3vcoBjYF1EotZwWFZdcW8OAxcP9Wrt3yHW0QXez/M5iXKNb+C3JGe90BfbjU0tHOg 6PbQ== X-Gm-Message-State: AOJu0YxNNGyhaxW2YrsW4VY1G0dyCewO8tRyqrovabppEpHtp5RgSBN8 kQ53RWxvEmYZ9OkByNa1mlE= X-Google-Smtp-Source: AGHT+IHW/+GUt9rsqBDwf3dvc4xtAyQgSgmNc8mOvgp5o+7JqJR+Xtyw1Y8aLU2OR796fXy4RXgDag== X-Received: by 2002:a05:6870:ecab:b0:1c8:bbd0:2fd5 with SMTP id eo43-20020a056870ecab00b001c8bbd02fd5mr22645989oab.4.1692959160592; Fri, 25 Aug 2023 03:26:00 -0700 (PDT) Received: from fabio-Precision-3551.. ([2804:14c:485:4b61:3d89:37d3:ba11:1a82]) by smtp.gmail.com with ESMTPSA id eb37-20020a056870a8a500b001bf3942ea12sm835916oab.1.2023.08.25.03.25.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Aug 2023 03:26:00 -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 3/4] reboot: Introduce hw_protection_reboot() Date: Fri, 25 Aug 2023 07:24:52 -0300 Message-Id: <20230825102453.836627-3-festevam@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230825102453.836627-1-festevam@gmail.com> References: <20230825102453.836627-1-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 --- 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..64517d1e4c55 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 *