From: Daniel Bristot de Oliveira <bristot@redhat.com>
To: linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>
Cc: Tommaso Cucinotta <tommaso.cucinotta@santannapisa.it>,
Kate Carcia <kcarcia@redhat.com>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Jonathan Corbet <corbet@lwn.net>, Ingo Molnar <mingo@redhat.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Joel Fernandes <joel@joelfernandes.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Gabriele Paoloni <gabriele.paoloni@intel.com>,
Juri Lelli <juri.lelli@redhat.com>,
Clark Williams <williams@redhat.com>,
linux-doc@vger.kernel.org
Subject: [RFC PATCH 12/16] rv/reactors: Add the printk reactor
Date: Wed, 19 May 2021 13:36:33 +0200 [thread overview]
Message-ID: <e50bb930b7048bca17a8bdc8e6922a514bee3524.1621414942.git.bristot@redhat.com> (raw)
In-Reply-To: <cover.1621414942.git.bristot@redhat.com>
Sample reactor that printks the reaction message.
Note: do not use this reactor with rq_lock taken, it will lock the
system until printk can handle that.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
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: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Gabriele Paoloni <gabriele.paoloni@intel.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
---
kernel/trace/rv/Kconfig | 8 ++++++
kernel/trace/rv/Makefile | 3 ++-
kernel/trace/rv/reactors/printk.c | 43 +++++++++++++++++++++++++++++++
3 files changed, 53 insertions(+), 1 deletion(-)
create mode 100644 kernel/trace/rv/reactors/printk.c
diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig
index 612b36b97663..6cbfb0f9cf76 100644
--- a/kernel/trace/rv/Kconfig
+++ b/kernel/trace/rv/Kconfig
@@ -38,4 +38,12 @@ config RV_REACTORS
tracing reactions, printing the monitor output via tracepoints,
but other reactions can be added (on-demand) via this interface.
+config RV_REACT_PRINTK
+ tristate "Printk reactor"
+ depends on RV_REACTORS
+ default y if RV_REACTORS
+ help
+ Enables the printk reactor. The printk reactor emmits a printk()
+ message if an exception is found.
+
endif # RV
diff --git a/kernel/trace/rv/Makefile b/kernel/trace/rv/Makefile
index af0ff9a46418..a57cb3c3d410 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) += reactors/printk.o
diff --git a/kernel/trace/rv/reactors/printk.c b/kernel/trace/rv/reactors/printk.c
new file mode 100644
index 000000000000..f929eead6000
--- /dev/null
+++ b/kernel/trace/rv/reactors/printk.c
@@ -0,0 +1,43 @@
+/*
+ * Printk RV reactor:
+ * Prints the exception msg to the kernel message log.
+ *
+ * Copyright (C) 2019-2021 Daniel Bristot de Oliveira <bristot@redhat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+#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(msg);
+}
+
+struct rv_reactor rv_printk = {
+ .name = "printk",
+ .description = "prints the exception msg to the kernel message log",
+ .react = rv_printk_reaction
+};
+
+int register_react_printk(void)
+{
+ rv_register_reactor(&rv_printk);
+ return 0;
+}
+
+void unregister_react_printk(void)
+{
+ rv_unregister_reactor(&rv_printk);
+}
+
+module_init(register_react_printk);
+module_exit(unregister_react_printk);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Daniel Bristot de Oliveira");
+MODULE_DESCRIPTION("printk rv reactor: printk if an exception is hit");
--
2.26.2
next prev parent reply other threads:[~2021-05-19 11:39 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 11:36 [RFC PATCH 00/16] The Runtime Verification (RV) interface Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 01/16] rv: Add " Daniel Bristot de Oliveira
2021-05-19 18:10 ` Randy Dunlap
2021-05-20 6:54 ` Daniel Bristot de Oliveira
2021-08-04 1:31 ` Steven Rostedt
2021-05-19 11:36 ` [RFC PATCH 02/16] rv: Add runtime reactors interface Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 03/16] rv/include: Add helper functions for deterministic automata Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 04/16] rv/include: Add deterministic automata monitor definition via C macros Daniel Bristot de Oliveira
2021-05-19 18:27 ` Peter Zijlstra
2021-05-20 7:13 ` Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 05/16] rv/include: Add tracing helper functions Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 06/16] tools/rv: Add dot2c Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 07/16] tools/rv: Add dot2k Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 08/16] rv/monitors: Add the wip monitor skeleton created by dot2k Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 09/16] rv/monitors: wip instrumentation and Makefile/Kconfig entries Daniel Bristot de Oliveira
2021-05-19 18:14 ` Randy Dunlap
2021-05-20 6:57 ` Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 10/16] rv/monitors: Add the wwnr monitor skeleton created by dot2k Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 11/16] rv/monitors: wwnr instrumentation and Makefile/Kconfig entries Daniel Bristot de Oliveira
2021-05-19 18:16 ` Randy Dunlap
2021-05-20 6:59 ` Daniel Bristot de Oliveira
2021-05-19 11:36 ` Daniel Bristot de Oliveira [this message]
2021-05-19 11:36 ` [RFC PATCH 13/16] rv/reactors: Add the panic reactor Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 14/16] rv/docs: Add a basic documentation Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 15/16] rv/docs: Add deterministic automata monitor synthesis documentation Daniel Bristot de Oliveira
2021-05-19 11:36 ` [RFC PATCH 16/16] rv/docs: Add deterministic automata instrumentation documentation Daniel Bristot de Oliveira
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