Merge tag 'trace-v6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:

 - Runtime verification infrastructure

   This is the biggest change here. It introduces the runtime
   verification that is necessary for running Linux on safety critical
   systems.

   It allows for deterministic automata models to be inserted into the
   kernel that will attach to tracepoints, where the information on
   these tracepoints will move the model from state to state.

   If a state is encountered that does not belong to the model, it will
   then activate a given reactor, that could just inform the user or
   even panic the kernel (for which safety critical systems will detect
   and can recover from).

 - Two monitor models are also added: Wakeup In Preemptive (WIP - not to
   be confused with "work in progress"), and Wakeup While Not Running
   (WWNR).

 - Added __vstring() helper to the TRACE_EVENT() macro to replace
   several vsnprintf() usages that were all doing it wrong.

 - eprobes now can have their event autogenerated when the event name is
   left off.

 - The rest is various cleanups and fixes.

* tag 'trace-v6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (50 commits)
  rv: Unlock on error path in rv_unregister_reactor()
  tracing: Use alignof__(struct {type b;}) instead of offsetof()
  tracing/eprobe: Show syntax error logs in error_log file
  scripts/tracing: Fix typo 'the the' in comment
  tracepoints: It is CONFIG_TRACEPOINTS not CONFIG_TRACEPOINT
  tracing: Use free_trace_buffer() in allocate_trace_buffers()
  tracing: Use a struct alignof to determine trace event field alignment
  rv/reactor: Add the panic reactor
  rv/reactor: Add the printk reactor
  rv/monitor: Add the wwnr monitor
  rv/monitor: Add the wip monitor
  rv/monitor: Add the wip monitor skeleton created by dot2k
  Documentation/rv: Add deterministic automata instrumentation documentation
  Documentation/rv: Add deterministic automata monitor synthesis documentation
  tools/rv: Add dot2k
  Documentation/rv: Add deterministic automaton documentation
  tools/rv: Add dot2c
  Documentation/rv: Add a basic documentation
  rv/include: Add instrumentation helper functions
  rv/include: Add deterministic automata monitor definition via C macros
  ...

1 files changed, 70 insertions, 0 deletions

diff --git a/include/linux/rv.h b/include/linux/rv.h
new file mode 100644
index 000000000000..8883b41d88ec
--- /dev/null
+++ b/include/linux/rv.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Runtime Verification.
+ *
+ * For futher information, see: kernel/trace/rv/rv.c.
+ */
+#ifndef _LINUX_RV_H
+#define _LINUX_RV_H
+
+#define MAX_DA_NAME_LEN	24
+
+#ifdef CONFIG_RV
+/*
+ * Deterministic automaton per-object variables.
+ */
+struct da_monitor {
+	bool		monitoring;
+	unsigned int	curr_state;
+};
+
+/*
+ * Per-task RV monitors count. Nowadays fixed in RV_PER_TASK_MONITORS.
+ * If we find justification for more monitors, we can think about
+ * adding more or developing a dynamic method. So far, none of
+ * these are justified.
+ */
+#define RV_PER_TASK_MONITORS		1
+#define RV_PER_TASK_MONITOR_INIT	(RV_PER_TASK_MONITORS)
+
+/*
+ * Futher monitor types are expected, so make this a union.
+ */
+union rv_task_monitor {
+	struct da_monitor da_mon;
+};
+
+#ifdef CONFIG_RV_REACTORS
+struct rv_reactor {
+	const char		*name;
+	const char		*description;
+	void			(*react)(char *msg);
+};
+#endif
+
+struct rv_monitor {
+	const char		*name;
+	const char		*description;
+	bool			enabled;
+	int			(*enable)(void);
+	void			(*disable)(void);
+	void			(*reset)(void);
+#ifdef CONFIG_RV_REACTORS
+	void			(*react)(char *msg);
+#endif
+};
+
+bool rv_monitoring_on(void);
+int rv_unregister_monitor(struct rv_monitor *monitor);
+int rv_register_monitor(struct rv_monitor *monitor);
+int rv_get_task_monitor_slot(void);
+void rv_put_task_monitor_slot(int slot);
+
+#ifdef CONFIG_RV_REACTORS
+bool rv_reacting_on(void);
+int rv_unregister_reactor(struct rv_reactor *reactor);
+int rv_register_reactor(struct rv_reactor *reactor);
+#endif /* CONFIG_RV_REACTORS */
+
+#endif /* CONFIG_RV */
+#endif /* _LINUX_RV_H */