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    Subject[PATCH V5 16/16] rv/reactor: Add the panic reactor
    Date
    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@linux-watchdog.org>
    Cc: Guenter Roeck <linux@roeck-us.net>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    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: Daniel Bristot de Oliveira <bristot@kernel.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 f1d92d431130..ce2a90a89f55 100644
    --- a/kernel/trace/rv/Kconfig
    +++ b/kernel/trace/rv/Kconfig
    @@ -71,3 +71,11 @@ 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..c9b9ed99495b
    --- /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@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);
    +}
    +
    +struct rv_reactor rv_panic = {
    + .name = "panic",
    + .description = "panic the system if an exception is found.",
    + .react = rv_panic_reaction
    +};
    +
    +int register_react_panic(void)
    +{
    + rv_register_reactor(&rv_panic);
    + return 0;
    +}
    +
    +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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