diff options
| author | Daniel Bristot de Oliveira <bristot@kernel.org> | 2022-07-29 11:38:54 +0200 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-07-30 14:01:30 -0400 |
| commit | 135b881ea88566f27dd4acc5d2ed83ad418a3a69 (patch) | |
| tree | ca2969121d1fa1257fd99ac86d2e364913cafc36 /kernel/trace | |
| parent | ccc319dcb450d57b7befe924453d06804d83ba73 (diff) | |
rv/reactor: Add the printk reactor
A reactor that printks the reaction message.
Link: https://lkml.kernel.org/r/b65f18a7fd6dc6659a3008fd7b7392de3465d47b.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: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/rv/Kconfig | 8 | ||||
| -rw-r--r-- | kernel/trace/rv/Makefile | 3 | ||||
| -rw-r--r-- | kernel/trace/rv/reactor_printk.c | 42 |
3 files changed, 52 insertions, 1 deletions
diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index b259d6e8dc7c..e82d5015e6ab 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -60,3 +60,11 @@ config RV_REACTORS on the model's execution. By default, the monitors have tracing reactions, printing the monitor output via tracepoints, but other reactions can be added (on-demand) via this interface. + +config RV_REACT_PRINTK + bool "Printk reactor" + depends on RV_REACTORS + default y + help + Enables the printk reactor. The printk reactor emits a printk() + message if an exception is found. diff --git a/kernel/trace/rv/Makefile b/kernel/trace/rv/Makefile index af0ff9a46418..a13c750a35c1 100644 --- a/kernel/trace/rv/Makefile +++ b/kernel/trace/rv/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_RV) += rv.o -obj-$(CONFIG_RV_REACTORS) += rv_reactors.o 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 diff --git a/kernel/trace/rv/reactor_printk.c b/kernel/trace/rv/reactor_printk.c new file mode 100644 index 000000000000..31899f953af4 --- /dev/null +++ b/kernel/trace/rv/reactor_printk.c @@ -0,0 +1,42 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org> + * + * Printk RV reactor: + * Prints the exception msg to the kernel message log. + */ +#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_printk_reaction(char *msg) +{ + printk_deferred(msg); +} + +static struct rv_reactor rv_printk = { + .name = "printk", + .description = "prints the exception msg to the kernel message log.", + .react = rv_printk_reaction +}; + +static int register_react_printk(void) +{ + rv_register_reactor(&rv_printk); + return 0; +} + +static void unregister_react_printk(void) +{ + rv_unregister_reactor(&rv_printk); +} + +module_init(register_react_printk); +module_exit(unregister_react_printk); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Daniel Bristot de Oliveira"); +MODULE_DESCRIPTION("printk rv reactor: printk if an exception is hit."); |