Commit e88043c0 authored by Daniel Bristot de Oliveira's avatar Daniel Bristot de Oliveira Committed by Steven Rostedt (Google)
Browse files

rv/reactor: Add the panic reactor 

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 <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Gabriele Paoloni <gpaoloni@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Tao Zhou <tao.zhou@linux.dev>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Signed-off-by: default avatarDaniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 135b881e

kernel/trace/rv/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -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.

kernel/trace/rv/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

kernel/trace/rv/reactor_panic.c

0 → 100644
+43 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>

 *

 * Panic RV reactor:

 *   Prints the exception msg to the kernel message log and panic().

 */



#include <linux/ftrace.h>

#include <linux/tracepoint.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/rv.h>



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.");