From patchwork Wed May 25 13:47:42 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 9135409 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E64F8607D5 for ; Wed, 25 May 2016 13:48:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D8BEE27EE9 for ; Wed, 25 May 2016 13:48:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CDA3928253; Wed, 25 May 2016 13:48:14 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0C9BD28110 for ; Wed, 25 May 2016 13:48:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754387AbcEYNsL (ORCPT ); Wed, 25 May 2016 09:48:11 -0400 Received: from sauhun.de ([89.238.76.85]:36460 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754366AbcEYNsJ (ORCPT ); Wed, 25 May 2016 09:48:09 -0400 Received: from dslb-178-008-084-178.178.008.pools.vodafone-ip.de ([178.8.84.178]:46624 helo=localhost) by pokefinder.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1b5ZAH-0007iV-TZ; Wed, 25 May 2016 15:48:02 +0200 From: Wolfram Sang To: linux-watchdog@vger.kernel.org Cc: Wolfram Sang , linux-renesas-soc@vger.kernel.org, Guenter Roeck , Vladimir Zapolskiy Subject: [RFC 2/2] watchdog: pretimeout: add userspace notifier pretimeout governor Date: Wed, 25 May 2016 15:47:42 +0200 Message-Id: <1464184062-5230-3-git-send-email-wsa@the-dreams.de> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1464184062-5230-1-git-send-email-wsa@the-dreams.de> References: <1464184062-5230-1-git-send-email-wsa@the-dreams.de> Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Vladimir Zapolskiy Userspace notifier watchdog pretimeout governor, on watchdog pretimeout event sends a notification to userspace for further handling. Signed-off-by: Vladimir Zapolskiy Signed-off-by: Wolfram Sang --- drivers/watchdog/Kconfig | 16 +++++++++++ drivers/watchdog/Makefile | 1 + drivers/watchdog/pretimeout_userspace.c | 47 +++++++++++++++++++++++++++++++++ drivers/watchdog/watchdog_pretimeout.h | 2 ++ 4 files changed, 66 insertions(+) create mode 100644 drivers/watchdog/pretimeout_userspace.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 3682ae9d8a50ca..e69c17f518ef43 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1800,6 +1800,15 @@ config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP governor is selected by a user, write a short message to the kernel log buffer and don't do any system changes. +config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_USERSPACE + bool "userspace" + select WATCHDOG_PRETIMEOUT_GOV_USERSPACE + help + Use userspace watchdog pretimeout governor by default, + the governor sends a device state change uevent + notification, if a pretimeout event a reported by a + watchdog. + endchoice config WATCHDOG_PRETIMEOUT_GOV_PANIC @@ -1816,6 +1825,13 @@ config WATCHDOG_PRETIMEOUT_GOV_NOOP governor, only an informational message is added to the kernel log buffer, if watchdog pretimeout is happened. +config WATCHDOG_PRETIMEOUT_GOV_USERSPACE + tristate "Userspace notifier watchdog pretimeout governor" + help + Userspace notifier watchdog pretimeout governor, on watchdog + pretimeout event send a notification to userspace for + further handling. + endif # WATCHDOG_PRETIMEOUT_GOV endif # WATCHDOG diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 9330e4cabd8f9c..23423b8b73620c 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -10,6 +10,7 @@ watchdog-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV) += watchdog_pretimeout.o obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_PANIC) += pretimeout_panic.o obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_NOOP) += pretimeout_noop.o +obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_USERSPACE) += pretimeout_userspace.o # Only one watchdog can succeed. We probe the ISA/PCI/USB based # watchdog-cards first, then the architecture specific watchdog diff --git a/drivers/watchdog/pretimeout_userspace.c b/drivers/watchdog/pretimeout_userspace.c new file mode 100644 index 00000000000000..cf7b03765f3254 --- /dev/null +++ b/drivers/watchdog/pretimeout_userspace.c @@ -0,0 +1,47 @@ +/* + * Copyright (C) 2015 Mentor Graphics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ + +#include +#include + +#include "watchdog_pretimeout.h" + +/** + * pretimeout_userspace - Notify userspace on watchdog pretimeout event + * @wdd - watchdog_device + * + * Send watchdog device uevent to userspace to handle pretimeout event + */ +static void pretimeout_userspace(struct watchdog_device *wdd) +{ + watchdog_dev_uevent(wdd); +} + +static struct watchdog_governor watchdog_gov_userspace = { + .name = "userspace", + .pretimeout = pretimeout_userspace, + .owner = THIS_MODULE, +}; + +static int __init watchdog_gov_userspace_register(void) +{ + return watchdog_register_governor(&watchdog_gov_userspace); +} +module_init(watchdog_gov_userspace_register); + +static void __exit watchdog_gov_userspace_unregister(void) +{ + watchdog_unregister_governor(&watchdog_gov_userspace); +} +module_exit(watchdog_gov_userspace_unregister); + +MODULE_AUTHOR("Vladimir Zapolskiy "); +MODULE_DESCRIPTION("Userspace notifier watchdog pretimeout governor"); +MODULE_LICENSE("GPL"); diff --git a/drivers/watchdog/watchdog_pretimeout.h b/drivers/watchdog/watchdog_pretimeout.h index 2e60450a2be64e..8365cd78f2507b 100644 --- a/drivers/watchdog/watchdog_pretimeout.h +++ b/drivers/watchdog/watchdog_pretimeout.h @@ -23,6 +23,8 @@ void watchdog_unregister_governor(struct watchdog_governor *gov); #define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "panic" #elif IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP) #define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "noop" +#elif IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_USERSPACE) +#define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "userspace" #else #error "Default watchdog pretimeout governor is not set." #endif