From patchwork Mon Jul 25 20:11:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Bristot de Oliveira X-Patchwork-Id: 12928381 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 3D9F9C43334 for ; Mon, 25 Jul 2022 20:14:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237116AbiGYUOs (ORCPT ); Mon, 25 Jul 2022 16:14:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46674 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237144AbiGYUOI (ORCPT ); Mon, 25 Jul 2022 16:14:08 -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 A8B7522533; Mon, 25 Jul 2022 13:13:13 -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 2EC34B810F7; Mon, 25 Jul 2022 20:13:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57129C36AE2; Mon, 25 Jul 2022 20:13:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658779990; bh=b8X+BFzH2iCZK+xpE2p+40Q5LRHdNFPjgm8yK8trTBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AMgwab7LYctG/3RHLwj4NLkVhPcNl8F//ulGEjpVplYrixmBJkG9TkvmRNsqLmdD7 qLN4L/xenYZ5fs4fss7sqROP6qBPJAdIX3jihGSBP6CcsESxQ4e4gBP9cHS/+vsaZZ r+vOcyeETQriLPkpmp5L642B1YMB4xKewS04czeYMKIXud1oQtANi06yVj5ygr4bvL B6Z4biKifOgHaiMj0NdmclZu66YeEEEovYz0uNbL+cndT3Tb0HWZPYa6Nj78S5ZjP0 WudNGdNsg3/ozSWleb/CrXPp7LlOV9R6wWuiTdRedRxIil5IBF/7FNSjpcQeLZwp05 hlggO3ns1zl4A== From: Daniel Bristot de Oliveira To: Steven Rostedt Cc: Daniel Bristot de Oliveira , 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-kernel@vger.kernel.org, linux-trace-devel@vger.kernel.org Subject: [PATCH V7 16/16] rv/reactor: Add the panic reactor Date: Mon, 25 Jul 2022 22:11:28 +0200 Message-Id: <8ea3fc5185e63c95d35ef7abd8c436e8a1730d8d.1658778484.git.bristot@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org 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. Cc: Wim Van Sebroeck Cc: Guenter Roeck Cc: Jonathan Corbet Cc: Steven Rostedt 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 --- 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.");