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linux-7.2.3/kernel/trace/rv/monitors/scpd/Kconfig

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+# SPDX-License-Identifier: GPL-2.0-only
+#
+config RV_MON_SCPD
+	depends on RV
+	depends on TRACE_PREEMPT_TOGGLE
+	depends on RV_MON_SCHED
+	default y
+	select DA_MON_EVENTS_IMPLICIT
+	bool "scpd monitor"
+	help
+	  Monitor to ensure schedule is called with preemption disabled.
+	  This monitor is part of the sched monitors collection.
+
+	  For further information, see:
+	    Documentation/trace/rv/monitor_sched.rst

linux-7.2.3/kernel/trace/rv/monitors/scpd/scpd.c

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+// 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>
+
+#define MODULE_NAME "scpd"
+
+#include <trace/events/sched.h>
+#include <trace/events/preemptirq.h>
+#include <rv_trace.h>
+#include <monitors/sched/sched.h>
+
+#define RV_MON_TYPE RV_MON_PER_CPU
+#include "scpd.h"
+#include <rv/da_monitor.h>
+
+static void handle_preempt_disable(void *data, unsigned long ip, unsigned long parent_ip)
+{
+	da_handle_event(preempt_disable_scpd);
+}
+
+static void handle_preempt_enable(void *data, unsigned long ip, unsigned long parent_ip)
+{
+	da_handle_start_event(preempt_enable_scpd);
+}
+
+static void handle_schedule_entry(void *data, bool preempt)
+{
+	da_handle_event(schedule_entry_scpd);
+}
+
+static void handle_schedule_exit(void *data, bool is_switch)
+{
+	da_handle_event(schedule_exit_scpd);
+}
+
+static int enable_scpd(void)
+{
+	int retval;
+
+	retval = da_monitor_init();
+	if (retval)
+		return retval;
+
+	rv_attach_trace_probe("scpd", preempt_disable, handle_preempt_disable);
+	rv_attach_trace_probe("scpd", preempt_enable, handle_preempt_enable);
+	rv_attach_trace_probe("scpd", sched_entry_tp, handle_schedule_entry);
+	rv_attach_trace_probe("scpd", sched_exit_tp, handle_schedule_exit);
+
+	return 0;
+}
+
+static void disable_scpd(void)
+{
+	rv_this.enabled = 0;
+
+	rv_detach_trace_probe("scpd", preempt_disable, handle_preempt_disable);
+	rv_detach_trace_probe("scpd", preempt_enable, handle_preempt_enable);
+	rv_detach_trace_probe("scpd", sched_entry_tp, handle_schedule_entry);
+	rv_detach_trace_probe("scpd", sched_exit_tp, handle_schedule_exit);
+
+	da_monitor_destroy();
+}
+
+static struct rv_monitor rv_this = {
+	.name = "scpd",
+	.description = "schedule called with preemption disabled.",
+	.enable = enable_scpd,
+	.disable = disable_scpd,
+	.reset = da_monitor_reset_all,
+	.enabled = 0,
+};
+
+static int __init register_scpd(void)
+{
+	return rv_register_monitor(&rv_this, &rv_sched);
+}
+
+static void __exit unregister_scpd(void)
+{
+	rv_unregister_monitor(&rv_this);
+}
+
+module_init(register_scpd);
+module_exit(unregister_scpd);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
+MODULE_DESCRIPTION("scpd: schedule called with preemption disabled.");

linux-7.2.3/kernel/trace/rv/monitors/scpd/scpd.h

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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Automatically generated C representation of scpd automaton
+ * For further information about this format, see kernel documentation:
+ *   Documentation/trace/rv/deterministic_automata.rst
+ */
+
+#define MONITOR_NAME scpd
+
+enum states_scpd {
+	cant_sched_scpd,
+	can_sched_scpd,
+	state_max_scpd,
+};
+
+#define INVALID_STATE state_max_scpd
+
+enum events_scpd {
+	preempt_disable_scpd,
+	preempt_enable_scpd,
+	schedule_entry_scpd,
+	schedule_exit_scpd,
+	event_max_scpd,
+};
+
+struct automaton_scpd {
+	char *state_names[state_max_scpd];
+	char *event_names[event_max_scpd];
+	unsigned char function[state_max_scpd][event_max_scpd];
+	unsigned char initial_state;
+	bool final_states[state_max_scpd];
+};
+
+static const struct automaton_scpd automaton_scpd = {
+	.state_names = {
+		"cant_sched",
+		"can_sched",
+	},
+	.event_names = {
+		"preempt_disable",
+		"preempt_enable",
+		"schedule_entry",
+		"schedule_exit",
+	},
+	.function = {
+		{     can_sched_scpd,     INVALID_STATE,     INVALID_STATE,     INVALID_STATE },
+		{     INVALID_STATE,    cant_sched_scpd,     can_sched_scpd,     can_sched_scpd },
+	},
+	.initial_state = cant_sched_scpd,
+	.final_states = { 1, 0 },
+};

linux-7.2.3/kernel/trace/rv/monitors/scpd/scpd_trace.h

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+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * Snippet to be included in rv_trace.h
+ */
+
+#ifdef CONFIG_RV_MON_SCPD
+DEFINE_EVENT(event_da_monitor, event_scpd,
+	     TP_PROTO(char *state, char *event, char *next_state, bool final_state),
+	     TP_ARGS(state, event, next_state, final_state));
+
+DEFINE_EVENT(error_da_monitor, error_scpd,
+	     TP_PROTO(char *state, char *event),
+	     TP_ARGS(state, event));
+#endif /* CONFIG_RV_MON_SCPD */