From patchwork Mon Apr 19 11:48:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Vaittinen, Matti" X-Patchwork-Id: 12211691 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F309EC43460 for ; Mon, 19 Apr 2021 11:49:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C4FD861166 for ; Mon, 19 Apr 2021 11:49:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238717AbhDSLtj (ORCPT ); Mon, 19 Apr 2021 07:49:39 -0400 Received: from mail-lj1-f169.google.com ([209.85.208.169]:41968 "EHLO mail-lj1-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238730AbhDSLti (ORCPT ); Mon, 19 Apr 2021 07:49:38 -0400 Received: by mail-lj1-f169.google.com with SMTP id a36so28140549ljq.8; Mon, 19 Apr 2021 04:49:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=1y568k09qtcL9FbHc6AZ/jNHO50SGhDLwYirPpmIwsU=; b=Y2TjJZ8UYyNPiyt5o+0GgNjastLMavb+BRq9xFQVVQgThsjpVIDCufnY8BFwiP7SOk DGF5tIUM6PMh5UP4l2sVh15Ej6uxSubQVDa9Qru4CocSEwv1VkDqvfytxETrAQvtU4O8 LthlYBMza+kg9DTzCtYg/88uK2xYaXNBWKKue/wQhC858Kp/YqnVe/TOV6XdpNIeE9CN v7vk81VMX4es+NV5vFMtxGt8KCD1XljC9mcXLFilwotiyLlsd63QZ7kMHTTxjhIbGwaA UPS/zplZcY6eDXvaZcBLcJwLmqHjEXwipw2PrhcNCMXB6aaFzTjFhzVEJb/GMZPgdsvB WcfQ== X-Gm-Message-State: AOAM531RWmBuavJFk2frsAvn42UgVO5Btjscj2FAM+QYv8Ixi4ImKU4T 3o3xe2wmEsLOyE3cU9roxyc= X-Google-Smtp-Source: ABdhPJz0+6sYh/9WvqRk29PhyZlnlhB58yYK7gD7vOFVu1WxhJxDyYTfQ5h62FTofyAoeJH2J2o+Dw== X-Received: by 2002:a2e:3209:: with SMTP id y9mr11421161ljy.146.1618832946239; Mon, 19 Apr 2021 04:49:06 -0700 (PDT) Received: from localhost.localdomain (dc7vkhyyyyyyyyyyyyydy-3.rev.dnainternet.fi. [2001:14ba:16e2:8300::6]) by smtp.gmail.com with ESMTPSA id a9sm1815963lfo.186.2021.04.19.04.49.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Apr 2021 04:49:05 -0700 (PDT) Date: Mon, 19 Apr 2021 14:48:57 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Mark Brown , Kees Cook , Andy Shevchenko , Zhang Rui , Guenter Roeck , "agross@kernel.org" , "devicetree@vger.kernel.org" , linux-power , "linux-kernel@vger.kernel.org" , "linux-renesas-soc@vger.kernel.org" , "linux-arm-msm@vger.kernel.org" , "bjorn.andersson@linaro.org" , "lgirdwood@gmail.com" , "robh+dt@kernel.org" , Daniel Lezcano , Amit Kucheria , Matteo Croce , Andrew Morton , Petr Mladek , "Rafael J. Wysocki" , Mike Rapoport , Josef Bacik , Kai-Heng Feng , linux-pm@vger.kernel.org Subject: [PATCH v8 02/10] reboot: Add hardware protection power-off Message-ID: References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org There can be few cases when we need to shut-down the system in order to protect the hardware. Currently this is done at east by the thermal core when temperature raises over certain limit. Some PMICs can also generate interrupts for example for over-current or over-voltage, voltage drops, short-circuit, ... etc. On some systems these are a sign of hardware failure and only thing to do is try to protect the rest of the hardware by shutting down the system. Add shut-down logic which can be used by all subsystems instead of implementing the shutdown in each subsystem. The logic is stolen from thermal_core with difference of using atomic_t instead of a mutex in order to allow calls directly from IRQ context. Signed-off-by: Matti Vaittinen --- Changelog: v8: (changes suggested by Daniel Lezcano) - replace a protection implemented by a flag + spin_lock_irqsave() with simple atomic_dec_and_test(). - Split thermal-core changes and adding the new API to separate patches v7: - New patch --- include/linux/reboot.h | 1 + kernel/reboot.c | 80 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 81 insertions(+) diff --git a/include/linux/reboot.h b/include/linux/reboot.h index 3734cd8f38a8..af907a3d68d1 100644 --- a/include/linux/reboot.h +++ b/include/linux/reboot.h @@ -79,6 +79,7 @@ extern char poweroff_cmd[POWEROFF_CMD_PATH_LEN]; extern void orderly_poweroff(bool force); extern void orderly_reboot(void); +void hw_protection_shutdown(const char *reason, int ms_until_forced); /* * Emergency restart, callable from an interrupt handler. diff --git a/kernel/reboot.c b/kernel/reboot.c index a6ad5eb2fa73..5da8c80a2647 100644 --- a/kernel/reboot.c +++ b/kernel/reboot.c @@ -7,6 +7,7 @@ #define pr_fmt(fmt) "reboot: " fmt +#include #include #include #include @@ -518,6 +519,85 @@ void orderly_reboot(void) } EXPORT_SYMBOL_GPL(orderly_reboot); +/** + * hw_failure_emergency_poweroff_func - emergency poweroff work after a known delay + * @work: work_struct associated with the emergency poweroff function + * + * This function is called in very critical situations to force + * a kernel poweroff after a configurable timeout value. + */ +static void hw_failure_emergency_poweroff_func(struct work_struct *work) +{ + /* + * We have reached here after the emergency shutdown waiting period has + * expired. This means orderly_poweroff has not been able to shut off + * the system for some reason. + * + * Try to shut down the system immediately using kernel_power_off + * if populated + */ + WARN(1, "Hardware protection timed-out. Trying forced poweroff\n"); + kernel_power_off(); + + /* + * Worst of the worst case trigger emergency restart + */ + WARN(1, + "Hardware protection shutdown failed. Trying emergency restart\n"); + emergency_restart(); +} + +static DECLARE_DELAYED_WORK(hw_failure_emergency_poweroff_work, + hw_failure_emergency_poweroff_func); + +/** + * hw_failure_emergency_poweroff - Trigger an emergency system poweroff + * + * This may be called from any critical situation to trigger a system shutdown + * after a given period of time. If time is negative this is not scheduled. + */ +static void hw_failure_emergency_poweroff(int poweroff_delay_ms) +{ + if (poweroff_delay_ms <= 0) + return; + schedule_delayed_work(&hw_failure_emergency_poweroff_work, + msecs_to_jiffies(poweroff_delay_ms)); +} + +/** + * hw_protection_shutdown - Trigger an emergency system poweroff + * + * @reason: Reason of emergency shutdown to be printed. + * @ms_until_forced: Time to wait for orderly shutdown before tiggering a + * forced shudown. Negative value disables the forced + * shutdown. + * + * Initiate an emergency system shutdown in order to protect hardware from + * further damage. Usage examples include a thermal protection or a voltage or + * current regulator failures. + * NOTE: The request is ignored if protection shutdown is already pending even + * if the previous request has given a large timeout for forced shutdown. + * Can be called from any context. + */ +void hw_protection_shutdown(const char *reason, int ms_until_forced) +{ + static atomic_t allow_proceed = ATOMIC_INIT(1); + + pr_emerg("HARDWARE PROTECTION shutdown (%s)\n", reason); + + /* Shutdown should be initiated only once. */ + if (!atomic_dec_and_test(&allow_proceed)) + return; + + /* + * Queue a backup emergency shutdown in the event of + * orderly_poweroff failure + */ + hw_failure_emergency_poweroff(ms_until_forced); + orderly_poweroff(true); +} +EXPORT_SYMBOL_GPL(hw_protection_shutdown); + static int __init reboot_setup(char *str) { for (;;) { From patchwork Mon Apr 19 11:49:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Vaittinen, Matti" X-Patchwork-Id: 12211693 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 08973C43462 for ; Mon, 19 Apr 2021 11:49:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E0DA261221 for ; Mon, 19 Apr 2021 11:49:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238919AbhDSLuL (ORCPT ); Mon, 19 Apr 2021 07:50:11 -0400 Received: from mail-lf1-f41.google.com ([209.85.167.41]:42792 "EHLO mail-lf1-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238914AbhDSLuG (ORCPT ); Mon, 19 Apr 2021 07:50:06 -0400 Received: by mail-lf1-f41.google.com with SMTP id z13so38422070lfd.9; Mon, 19 Apr 2021 04:49:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=jd8ZqQr7aA+TfxalG5Zpojil8sxWCY4+ctswmpE1Z1Q=; b=jXQ8MSwq9PfcDQVqc90MHB1699FOt7j/4n5k7E5puQDEXqtVJ+wtwP/gzOV+M/d6wG X+DaksaUIYRFd0hbORlDNfKgWdmHb710aLW7HD0g7ydCoZRpzIkYEEBd8YVYj4wAJLJK 7MbIc+KbXZmOAVP6W9hJW9Qv+Oi2pyx/H7JtwTOu9KAvq47JaXkZbM8Z9mGtc0pFDvr1 Qph1LPTIy1+dn+u4CRfJyMAUwkO7albZf6F44wzlE+oEk5bsiUeudeDlGvhk8E6L578f bX/Y9TccTVgWzUNkFncvzviJMXH3A+oHwpX5miLtcYiDdIdZfB0vNLcejMMC9/nXtDiY uO1A== X-Gm-Message-State: AOAM532P+qiQMvhg9yMRm9GEnZgMC/NDixl89/n9ukflZdQXpEehoaZ8 cilxWBHkDYATWkp2KbD/kxk= X-Google-Smtp-Source: ABdhPJyFuwzrHLSm7DTsZU0JJPCmu1/xXK1hF4dMaPRI7Zfs3r/1hX4dbdT0xNJVAkEIRjcPMdeP4A== X-Received: by 2002:ac2:5f1b:: with SMTP id 27mr11709672lfq.425.1618832975571; Mon, 19 Apr 2021 04:49:35 -0700 (PDT) Received: from localhost.localdomain (dc7vkhyyyyyyyyyyyyydy-3.rev.dnainternet.fi. [2001:14ba:16e2:8300::6]) by smtp.gmail.com with ESMTPSA id j11sm1803022lfg.257.2021.04.19.04.49.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Apr 2021 04:49:35 -0700 (PDT) Date: Mon, 19 Apr 2021 14:49:27 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Mark Brown , Kees Cook , Andy Shevchenko , Zhang Rui , Guenter Roeck , "agross@kernel.org" , "devicetree@vger.kernel.org" , linux-power , "linux-kernel@vger.kernel.org" , "linux-renesas-soc@vger.kernel.org" , "linux-arm-msm@vger.kernel.org" , "bjorn.andersson@linaro.org" , "lgirdwood@gmail.com" , "robh+dt@kernel.org" , Daniel Lezcano , Amit Kucheria , Matteo Croce , Andrew Morton , Petr Mladek , "Rafael J. Wysocki" , Mike Rapoport , Josef Bacik , Kai-Heng Feng , linux-pm@vger.kernel.org Subject: [PATCH v8 03/10] thermal: Use generic HW-protection shutdown API Message-ID: <3b62226e320ab412357e102baf6d628e354a0b61.1618832466.git.matti.vaittinen@fi.rohmeurope.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The hardware shutdown function was exported from kernel/reboot for other subsystems to use. Logic is copied from the thermal_core. The protection mutex is replaced by an atomic_t to allow calls also from an IRQ context. Use the exported API instead of implementing own just for the thermal_core. Signed-off-by: Matti Vaittinen --- Changelog: v8: - new patch (change added in v7, splitted in own patch at v8) Use the exported API instead --- drivers/thermal/thermal_core.c | 63 +++------------------------------- 1 file changed, 4 insertions(+), 59 deletions(-) diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 996c038f83a4..b1444845af38 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -36,10 +36,8 @@ static LIST_HEAD(thermal_governor_list); static DEFINE_MUTEX(thermal_list_lock); static DEFINE_MUTEX(thermal_governor_lock); -static DEFINE_MUTEX(poweroff_lock); static atomic_t in_suspend; -static bool power_off_triggered; static struct thermal_governor *def_governor; @@ -327,70 +325,18 @@ static void handle_non_critical_trips(struct thermal_zone_device *tz, int trip) def_governor->throttle(tz, trip); } -/** - * thermal_emergency_poweroff_func - emergency poweroff work after a known delay - * @work: work_struct associated with the emergency poweroff function - * - * This function is called in very critical situations to force - * a kernel poweroff after a configurable timeout value. - */ -static void thermal_emergency_poweroff_func(struct work_struct *work) -{ - /* - * We have reached here after the emergency thermal shutdown - * Waiting period has expired. This means orderly_poweroff has - * not been able to shut off the system for some reason. - * Try to shut down the system immediately using kernel_power_off - * if populated - */ - WARN(1, "Attempting kernel_power_off: Temperature too high\n"); - kernel_power_off(); - - /* - * Worst of the worst case trigger emergency restart - */ - WARN(1, "Attempting emergency_restart: Temperature too high\n"); - emergency_restart(); -} - -static DECLARE_DELAYED_WORK(thermal_emergency_poweroff_work, - thermal_emergency_poweroff_func); - -/** - * thermal_emergency_poweroff - Trigger an emergency system poweroff - * - * This may be called from any critical situation to trigger a system shutdown - * after a known period of time. By default this is not scheduled. - */ -static void thermal_emergency_poweroff(void) +void thermal_zone_device_critical(struct thermal_zone_device *tz) { - int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS; /* * poweroff_delay_ms must be a carefully profiled positive value. - * Its a must for thermal_emergency_poweroff_work to be scheduled + * Its a must for forced_emergency_poweroff_work to be scheduled. */ - if (poweroff_delay_ms <= 0) - return; - schedule_delayed_work(&thermal_emergency_poweroff_work, - msecs_to_jiffies(poweroff_delay_ms)); -} + int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS; -void thermal_zone_device_critical(struct thermal_zone_device *tz) -{ dev_emerg(&tz->device, "%s: critical temperature reached, " "shutting down\n", tz->type); - mutex_lock(&poweroff_lock); - if (!power_off_triggered) { - /* - * Queue a backup emergency shutdown in the event of - * orderly_poweroff failure - */ - thermal_emergency_poweroff(); - orderly_poweroff(true); - power_off_triggered = true; - } - mutex_unlock(&poweroff_lock); + hw_protection_shutdown("Temperature too high", poweroff_delay_ms); } EXPORT_SYMBOL(thermal_zone_device_critical); @@ -1549,7 +1495,6 @@ static int __init thermal_init(void) ida_destroy(&thermal_cdev_ida); mutex_destroy(&thermal_list_lock); mutex_destroy(&thermal_governor_lock); - mutex_destroy(&poweroff_lock); return result; } postcore_initcall(thermal_init);