From patchwork Sun Jul 31 19:03:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 12933216 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 75547C3F6B0 for ; Sun, 31 Jul 2022 19:04:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237935AbiGaTE4 (ORCPT ); Sun, 31 Jul 2022 15:04:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237587AbiGaTEp (ORCPT ); Sun, 31 Jul 2022 15:04:45 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E43B10563; Sun, 31 Jul 2022 12:04:39 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id B9AA8B80DC5; Sun, 31 Jul 2022 19:04:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 764D5C433D7; Sun, 31 Jul 2022 19:04:36 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.96) (envelope-from ) id 1oIEEt-007GCp-1v; Sun, 31 Jul 2022 15:04:35 -0400 Message-ID: <20220731190435.430671181@goodmis.org> User-Agent: quilt/0.66 Date: Sun, 31 Jul 2022 15:03:49 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Wim Van Sebroeck , Guenter Roeck , Jonathan Corbet , Ingo Molnar , Thomas Gleixner , Peter Zijlstra , Will Deacon , Catalin Marinas , Marco Elver , Dmitry Vyukov , "Paul E. McKenney" , Shuah Khan , Gabriele Paoloni , Juri Lelli , Clark Williams , Tao Zhou , Randy Dunlap , linux-doc@vger.kernel.org, linux-trace-devel@vger.kernel.org, Daniel Bristot de Oliveira Subject: [for-next][PATCH 20/21] rv/reactor: Add the panic reactor References: <20220731190329.641602282@goodmis.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org From: Daniel Bristot de Oliveira Sample reactor that panics the system when an exception is found. This is useful both to capture a vmcore, or to fail-safe a critical system. Link: https://lkml.kernel.org/r/729aae3aba95f35738b8f8180e626d747d1d9da2.1659052063.git.bristot@kernel.org Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: Jonathan Corbet Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Peter Zijlstra Cc: Will Deacon Cc: Catalin Marinas Cc: Marco Elver Cc: Dmitry Vyukov Cc: "Paul E. McKenney" Cc: Shuah Khan Cc: Gabriele Paoloni Cc: Juri Lelli Cc: Clark Williams Cc: Tao Zhou Cc: Randy Dunlap Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google) --- kernel/trace/rv/Kconfig | 8 ++++++ kernel/trace/rv/Makefile | 1 + kernel/trace/rv/reactor_panic.c | 43 +++++++++++++++++++++++++++++++++ 3 files changed, 52 insertions(+) create mode 100644 kernel/trace/rv/reactor_panic.c diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index e82d5015e6ab..831779607e84 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -68,3 +68,11 @@ config RV_REACT_PRINTK help Enables the printk reactor. The printk reactor emits a printk() message if an exception is found. + +config RV_REACT_PANIC + bool "Panic reactor" + depends on RV_REACTORS + default y + help + Enables the panic reactor. The panic reactor emits a printk() + message if an exception is found and panic()s the system. diff --git a/kernel/trace/rv/Makefile b/kernel/trace/rv/Makefile index a13c750a35c1..963d14875b45 100644 --- a/kernel/trace/rv/Makefile +++ b/kernel/trace/rv/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_RV_MON_WIP) += monitors/wip/wip.o obj-$(CONFIG_RV_MON_WWNR) += monitors/wwnr/wwnr.o obj-$(CONFIG_RV_REACTORS) += rv_reactors.o obj-$(CONFIG_RV_REACT_PRINTK) += reactor_printk.o +obj-$(CONFIG_RV_REACT_PANIC) += reactor_panic.o diff --git a/kernel/trace/rv/reactor_panic.c b/kernel/trace/rv/reactor_panic.c new file mode 100644 index 000000000000..b698d05dd069 --- /dev/null +++ b/kernel/trace/rv/reactor_panic.c @@ -0,0 +1,43 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira + * + * Panic RV reactor: + * Prints the exception msg to the kernel message log and panic(). + */ + +#include +#include +#include +#include +#include +#include + +static void rv_panic_reaction(char *msg) +{ + panic(msg); +} + +static struct rv_reactor rv_panic = { + .name = "panic", + .description = "panic the system if an exception is found.", + .react = rv_panic_reaction +}; + +static int register_react_panic(void) +{ + rv_register_reactor(&rv_panic); + return 0; +} + +static void unregister_react_panic(void) +{ + rv_unregister_reactor(&rv_panic); +} + +module_init(register_react_panic); +module_exit(unregister_react_panic); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Daniel Bristot de Oliveira"); +MODULE_DESCRIPTION("panic rv reactor: panic if an exception is found.");