new file mode 100644
@@ -0,0 +1,38 @@
+enum states_wwnr {
+ not_running = 0,
+ running,
+ state_max
+};
+
+enum events_wwnr {
+ switch_in = 0,
+ switch_out,
+ wakeup,
+ event_max
+};
+
+struct automaton_wwnr {
+ char *state_names[state_max];
+ char *event_names[event_max];
+ char function[state_max][event_max];
+ char initial_state;
+ char final_states[state_max];
+};
+
+struct automaton_wwnr automaton_wwnr = {
+ .state_names = {
+ "not_running",
+ "running"
+ },
+ .event_names = {
+ "switch_in",
+ "switch_out",
+ "wakeup"
+ },
+ .function = {
+ { running, -1, not_running },
+ { -1, not_running, -1 },
+ },
+ .initial_state = not_running,
+ .final_states = { 1, 0 },
+};
\ No newline at end of file
new file mode 100644
@@ -0,0 +1,118 @@
+// 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>
+#include <rv/instrumentation.h>
+#include <rv/da_monitor.h>
+
+#define MODULE_NAME "wwnr"
+
+/*
+ * XXX: include required tracepoint headers, e.g.,
+ * #include <linux/trace/events/sched.h>
+ */
+
+/*
+ * This is the self-generated part of the monitor. Generally, there is no need
+ * to touch this section.
+ */
+#include "model.h"
+
+/*
+ * Declare the deterministic automata monitor.
+ *
+ * The rv monitor reference is needed for the monitor declaration.
+ */
+struct rv_monitor rv_wwnr;
+DECLARE_DA_MON_PER_TASK(wwnr, char);
+
+#define CREATE_TRACE_POINTS
+#include "wwnr.h"
+
+/*
+ * This is the instrumentation part of the monitor.
+ *
+ * This is the section where manual work is required. Here the kernel events
+ * are translated into model's event.
+ *
+ */
+static void handle_switch_in(void *data, /* XXX: fill header */)
+{
+ struct task_struct *p = /* XXX: how do I get p? */;
+ da_handle_event_wwnr(p, switch_in);
+}
+
+static void handle_switch_out(void *data, /* XXX: fill header */)
+{
+ struct task_struct *p = /* XXX: how do I get p? */;
+ da_handle_event_wwnr(p, switch_out);
+}
+
+static void handle_wakeup(void *data, /* XXX: fill header */)
+{
+ struct task_struct *p = /* XXX: how do I get p? */;
+ da_handle_event_wwnr(p, wakeup);
+}
+
+
+static int start_wwnr(void)
+{
+ int retval;
+
+ retval = da_monitor_init_wwnr();
+ if (retval)
+ return retval;
+
+ rv_attach_trace_probe("wwnr", /* XXX: tracepoint */, handle_switch_in);
+ rv_attach_trace_probe("wwnr", /* XXX: tracepoint */, handle_switch_out);
+ rv_attach_trace_probe("wwnr", /* XXX: tracepoint */, handle_wakeup);
+
+ return 0;
+}
+
+static void stop_wwnr(void)
+{
+ rv_wwnr.enabled = 0;
+
+ rv_detach_trace_probe("wwnr", /* XXX: tracepoint */, handle_switch_in);
+ rv_detach_trace_probe("wwnr", /* XXX: tracepoint */, handle_switch_out);
+ rv_detach_trace_probe("wwnr", /* XXX: tracepoint */, handle_wakeup);
+
+ da_monitor_destroy_wwnr();
+}
+
+/*
+ * This is the monitor register section.
+ */
+struct rv_monitor rv_wwnr = {
+ .name = "wwnr",
+ .description = "auto-generated wwnr",
+ .start = start_wwnr,
+ .stop = stop_wwnr,
+ .reset = da_monitor_reset_all_wwnr,
+ .enabled = 0,
+};
+
+int register_wwnr(void)
+{
+ rv_register_monitor(&rv_wwnr);
+ return 0;
+}
+
+void unregister_wwnr(void)
+{
+ if (rv_wwnr.enabled)
+ stop_wwnr();
+
+ rv_unregister_monitor(&rv_wwnr);
+}
+
+module_init(register_wwnr);
+module_exit(unregister_wwnr);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("dot2k: auto-generated");
+MODULE_DESCRIPTION("wwnr");
new file mode 100644
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM rv
+
+#if !defined(_WWNR_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _WWNR_TRACE_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(event_wwnr,
+
+ TP_PROTO(pid_t pid, char state, char event, char next_state, bool safe),
+
+ TP_ARGS(pid, state, event, next_state, safe),
+
+ TP_STRUCT__entry(
+ __field( pid_t, pid )
+ __field( char, state )
+ __field( char, event )
+ __field( char, next_state )
+ __field( bool, safe )
+ ),
+
+ TP_fast_assign(
+ __entry->pid = pid;
+ __entry->state = state;
+ __entry->event = event;
+ __entry->next_state = next_state;
+ __entry->safe = safe;
+ ),
+
+ TP_printk("%d: %s x %s -> %s %s",
+ __entry->pid,
+ model_get_state_name_wwnr(__entry->state),
+ model_get_event_name_wwnr(__entry->event),
+ model_get_state_name_wwnr(__entry->next_state),
+ __entry->safe ? "(safe)" : "")
+);
+
+TRACE_EVENT(error_wwnr,
+
+ TP_PROTO(pid_t pid, char state, char event),
+
+ TP_ARGS(pid, state, event),
+
+ TP_STRUCT__entry(
+ __field( pid_t, pid )
+ __field( char, state )
+ __field( char, event )
+ ),
+
+ TP_fast_assign(
+ __entry->pid = pid;
+ __entry->state = state;
+ __entry->event = event;
+ ),
+
+ TP_printk("%d event %s not expected in the state %s",
+ __entry->pid,
+ model_get_event_name_wwnr(__entry->event),
+ model_get_state_name_wwnr(__entry->state))
+);
+
+#endif /* _WWNR_H */
+
+/* This part ust be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE wwnr
+#include <trace/define_trace.h>
Per task wakeup while not running (wwnr) monitor, generated by dot2k with this command line: $ dot2k -d wwnr.dot -t per_task The model is: ----- %< ----- digraph state_automaton { center = true; size = "7,11"; {node [shape = plaintext, style=invis, label=""] "__init_not_running"}; {node [shape = ellipse] "not_running"}; {node [shape = plaintext] "not_running"}; {node [shape = plaintext] "running"}; "__init_not_running" -> "not_running"; "not_running" [label = "not_running", color = green3]; "not_running" -> "not_running" [ label = "wakeup" ]; "not_running" -> "running" [ label = "switch_in" ]; "running" [label = "running"]; "running" -> "not_running" [ label = "switch_out" ]; { rank = min ; "__init_not_running"; "not_running"; } } ----- >% ----- This model is broken, the reason is that a task can be running in the processor without being set as RUNNABLE. Think about a task about to sleep: 1: set_current_state(TASK_UNINTERRUPTIBLE); 2: schedule(); And then imagine an IRQ happening in between the lines one and two, waking the task up. BOOM, the wakeup will happen while the task is running. Q: Why do we need this model, so? A: To test the reactors. 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: 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/monitor_wwnr/model.h | 38 +++++++++ kernel/trace/rv/monitor_wwnr/wwnr.c | 118 +++++++++++++++++++++++++++ kernel/trace/rv/monitor_wwnr/wwnr.h | 70 ++++++++++++++++ 3 files changed, 226 insertions(+) create mode 100644 kernel/trace/rv/monitor_wwnr/model.h create mode 100644 kernel/trace/rv/monitor_wwnr/wwnr.c create mode 100644 kernel/trace/rv/monitor_wwnr/wwnr.h