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Date: Fri, 29 Jul 2022 11:38:55 +0200 From: Daniel Bristot de Oliveira <bristot@...nel.org> To: Steven Rostedt <rostedt@...dmis.org> Cc: Daniel Bristot de Oliveira <bristot@...nel.org>, Wim Van Sebroeck <wim@...ux-watchdog.org>, Guenter Roeck <linux@...ck-us.net>, Jonathan Corbet <corbet@....net>, Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Marco Elver <elver@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, "Paul E. McKenney" <paulmck@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>, Gabriele Paoloni <gpaoloni@...hat.com>, Juri Lelli <juri.lelli@...hat.com>, Clark Williams <williams@...hat.com>, Tao Zhou <tao.zhou@...ux.dev>, Randy Dunlap <rdunlap@...radead.org>, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-trace-devel@...r.kernel.org Subject: [PATCH V9 16/16] 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. Cc: Wim Van Sebroeck <wim@...ux-watchdog.org> Cc: Guenter Roeck <linux@...ck-us.net> Cc: Jonathan Corbet <corbet@....net> Cc: Steven Rostedt <rostedt@...dmis.org> Cc: Ingo Molnar <mingo@...hat.com> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Will Deacon <will@...nel.org> Cc: Catalin Marinas <catalin.marinas@....com> Cc: Marco Elver <elver@...gle.com> Cc: Dmitry Vyukov <dvyukov@...gle.com> Cc: "Paul E. McKenney" <paulmck@...nel.org> Cc: Shuah Khan <skhan@...uxfoundation.org> Cc: Gabriele Paoloni <gpaoloni@...hat.com> Cc: Juri Lelli <juri.lelli@...hat.com> Cc: Clark Williams <williams@...hat.com> Cc: Tao Zhou <tao.zhou@...ux.dev> Cc: Randy Dunlap <rdunlap@...radead.org> Cc: linux-doc@...r.kernel.org Cc: linux-kernel@...r.kernel.org Cc: linux-trace-devel@...r.kernel.org Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org> --- 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 <bristot@...nel.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."); -- 2.35.1
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