4 files changed, 251 insertions, 0 deletions
diff --git a/kernel/trace/rv/monitors/sssw/Kconfig b/kernel/trace/rv/monitors/sssw/Kconfig
new file mode 100644
index 000000000000..23b7eeb38bbf
--- /dev/null
+++ b/kernel/trace/rv/monitors/sssw/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+config RV_MON_SSSW
+	depends on RV
+	depends on RV_MON_SCHED
+	default y
+	select DA_MON_EVENTS_ID
+	bool "sssw monitor"
+	help
+	  Monitor to ensure sched_set_state to sleepable leads to sleeping and
+	  sleeping tasks require wakeup.
+	  This monitor is part of the sched monitors collection.
+
+	  For further information, see:
+	    Documentation/trace/rv/monitor_sched.rst
diff --git a/kernel/trace/rv/monitors/sssw/sssw.c b/kernel/trace/rv/monitors/sssw/sssw.c
new file mode 100644
index 000000000000..84b8d890d9d4
--- /dev/null
+++ b/kernel/trace/rv/monitors/sssw/sssw.c
@@ -0,0 +1,116 @@
+// 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 "sssw"
+
+#include <trace/events/sched.h>
+#include <trace/events/signal.h>
+#include <rv_trace.h>
+#include <monitors/sched/sched.h>
+
+#include "sssw.h"
+
+static struct rv_monitor rv_sssw;
+DECLARE_DA_MON_PER_TASK(sssw, unsigned char);
+
+static void handle_sched_set_state(void *data, struct task_struct *tsk, int state)
+{
+	if (state == TASK_RUNNING)
+		da_handle_start_event_sssw(tsk, sched_set_state_runnable_sssw);
+	else
+		da_handle_event_sssw(tsk, sched_set_state_sleepable_sssw);
+}
+
+static void handle_sched_switch(void *data, bool preempt,
+				struct task_struct *prev,
+				struct task_struct *next,
+				unsigned int prev_state)
+{
+	if (preempt)
+		da_handle_event_sssw(prev, sched_switch_preempt_sssw);
+	else if (prev_state == TASK_RUNNING)
+		da_handle_event_sssw(prev, sched_switch_yield_sssw);
+	else if (prev_state == TASK_RTLOCK_WAIT)
+		/* special case of sleeping task with racy conditions */
+		da_handle_event_sssw(prev, sched_switch_blocking_sssw);
+	else
+		da_handle_event_sssw(prev, sched_switch_suspend_sssw);
+	da_handle_event_sssw(next, sched_switch_in_sssw);
+}
+
+static void handle_sched_wakeup(void *data, struct task_struct *p)
+{
+	/*
+	 * Wakeup can also lead to signal_wakeup although the system is
+	 * actually runnable. The monitor can safely start with this event.
+	 */
+	da_handle_start_event_sssw(p, sched_wakeup_sssw);
+}
+
+static void handle_signal_deliver(void *data, int sig,
+				   struct kernel_siginfo *info,
+				   struct k_sigaction *ka)
+{
+	da_handle_event_sssw(current, signal_deliver_sssw);
+}
+
+static int enable_sssw(void)
+{
+	int retval;
+
+	retval = da_monitor_init_sssw();
+	if (retval)
+		return retval;
+
+	rv_attach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state);
+	rv_attach_trace_probe("sssw", sched_switch, handle_sched_switch);
+	rv_attach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup);
+	rv_attach_trace_probe("sssw", signal_deliver, handle_signal_deliver);
+
+	return 0;
+}
+
+static void disable_sssw(void)
+{
+	rv_sssw.enabled = 0;
+
+	rv_detach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state);
+	rv_detach_trace_probe("sssw", sched_switch, handle_sched_switch);
+	rv_detach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup);
+	rv_detach_trace_probe("sssw", signal_deliver, handle_signal_deliver);
+
+	da_monitor_destroy_sssw();
+}
+
+static struct rv_monitor rv_sssw = {
+	.name = "sssw",
+	.description = "set state sleep and wakeup.",
+	.enable = enable_sssw,
+	.disable = disable_sssw,
+	.reset = da_monitor_reset_all_sssw,
+	.enabled = 0,
+};
+
+static int __init register_sssw(void)
+{
+	return rv_register_monitor(&rv_sssw, &rv_sched);
+}
+
+static void __exit unregister_sssw(void)
+{
+	rv_unregister_monitor(&rv_sssw);
+}
+
+module_init(register_sssw);
+module_exit(unregister_sssw);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
+MODULE_DESCRIPTION("sssw: set state sleep and wakeup.");
diff --git a/kernel/trace/rv/monitors/sssw/sssw.h b/kernel/trace/rv/monitors/sssw/sssw.h
new file mode 100644
index 000000000000..243d54050c94
--- /dev/null
+++ b/kernel/trace/rv/monitors/sssw/sssw.h
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Automatically generated C representation of sssw automaton
+ * For further information about this format, see kernel documentation:
+ *   Documentation/trace/rv/deterministic_automata.rst
+ */
+
+enum states_sssw {
+	runnable_sssw = 0,
+	signal_wakeup_sssw,
+	sleepable_sssw,
+	sleeping_sssw,
+	state_max_sssw
+};
+
+#define INVALID_STATE state_max_sssw
+
+enum events_sssw {
+	sched_set_state_runnable_sssw = 0,
+	sched_set_state_sleepable_sssw,
+	sched_switch_blocking_sssw,
+	sched_switch_in_sssw,
+	sched_switch_preempt_sssw,
+	sched_switch_suspend_sssw,
+	sched_switch_yield_sssw,
+	sched_wakeup_sssw,
+	signal_deliver_sssw,
+	event_max_sssw
+};
+
+struct automaton_sssw {
+	char *state_names[state_max_sssw];
+	char *event_names[event_max_sssw];
+	unsigned char function[state_max_sssw][event_max_sssw];
+	unsigned char initial_state;
+	bool final_states[state_max_sssw];
+};
+
+static const struct automaton_sssw automaton_sssw = {
+	.state_names = {
+		"runnable",
+		"signal_wakeup",
+		"sleepable",
+		"sleeping"
+	},
+	.event_names = {
+		"sched_set_state_runnable",
+		"sched_set_state_sleepable",
+		"sched_switch_blocking",
+		"sched_switch_in",
+		"sched_switch_preempt",
+		"sched_switch_suspend",
+		"sched_switch_yield",
+		"sched_wakeup",
+		"signal_deliver"
+	},
+	.function = {
+		{
+			runnable_sssw,
+			sleepable_sssw,
+			sleeping_sssw,
+			runnable_sssw,
+			runnable_sssw,
+			INVALID_STATE,
+			runnable_sssw,
+			runnable_sssw,
+			runnable_sssw
+		},
+		{
+			INVALID_STATE,
+			sleepable_sssw,
+			INVALID_STATE,
+			signal_wakeup_sssw,
+			signal_wakeup_sssw,
+			INVALID_STATE,
+			signal_wakeup_sssw,
+			signal_wakeup_sssw,
+			runnable_sssw
+		},
+		{
+			runnable_sssw,
+			sleepable_sssw,
+			sleeping_sssw,
+			sleepable_sssw,
+			sleepable_sssw,
+			sleeping_sssw,
+			signal_wakeup_sssw,
+			runnable_sssw,
+			sleepable_sssw
+		},
+		{
+			INVALID_STATE,
+			INVALID_STATE,
+			INVALID_STATE,
+			INVALID_STATE,
+			INVALID_STATE,
+			INVALID_STATE,
+			INVALID_STATE,
+			runnable_sssw,
+			INVALID_STATE
+		},
+	},
+	.initial_state = runnable_sssw,
+	.final_states = { 1, 0, 0, 0 },
+};
diff --git a/kernel/trace/rv/monitors/sssw/sssw_trace.h b/kernel/trace/rv/monitors/sssw/sssw_trace.h
new file mode 100644
index 000000000000..6c03cfc6960b
--- /dev/null
+++ b/kernel/trace/rv/monitors/sssw/sssw_trace.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * Snippet to be included in rv_trace.h
+ */
+
+#ifdef CONFIG_RV_MON_SSSW
+DEFINE_EVENT(event_da_monitor_id, event_sssw,
+	     TP_PROTO(int id, char *state, char *event, char *next_state, bool final_state),
+	     TP_ARGS(id, state, event, next_state, final_state));
+
+DEFINE_EVENT(error_da_monitor_id, error_sssw,
+	     TP_PROTO(int id, char *state, char *event),
+	     TP_ARGS(id, state, event));
+#endif /* CONFIG_RV_MON_SSSW */