1 files changed, 96 insertions, 0 deletions
diff --git a/kernel/trace/rv/monitors/snep/snep.c b/kernel/trace/rv/monitors/snep/snep.c
new file mode 100644
index 000000000000..0076ba6d7ea4
--- /dev/null
+++ b/kernel/trace/rv/monitors/snep/snep.c
@@ -0,0 +1,96 @@
+// 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 "snep"
+
+#include <trace/events/sched.h>
+#include <trace/events/preemptirq.h>
+#include <rv_trace.h>
+#include <monitors/sched/sched.h>
+
+#include "snep.h"
+
+static struct rv_monitor rv_snep;
+DECLARE_DA_MON_PER_CPU(snep, unsigned char);
+
+static void handle_preempt_disable(void *data, unsigned long ip, unsigned long parent_ip)
+{
+	da_handle_start_event_snep(preempt_disable_snep);
+}
+
+static void handle_preempt_enable(void *data, unsigned long ip, unsigned long parent_ip)
+{
+	da_handle_start_event_snep(preempt_enable_snep);
+}
+
+static void handle_schedule_entry(void *data, bool preempt, unsigned long ip)
+{
+	da_handle_event_snep(schedule_entry_snep);
+}
+
+static void handle_schedule_exit(void *data, bool is_switch, unsigned long ip)
+{
+	da_handle_start_event_snep(schedule_exit_snep);
+}
+
+static int enable_snep(void)
+{
+	int retval;
+
+	retval = da_monitor_init_snep();
+	if (retval)
+		return retval;
+
+	rv_attach_trace_probe("snep", preempt_disable, handle_preempt_disable);
+	rv_attach_trace_probe("snep", preempt_enable, handle_preempt_enable);
+	rv_attach_trace_probe("snep", sched_entry_tp, handle_schedule_entry);
+	rv_attach_trace_probe("snep", sched_exit_tp, handle_schedule_exit);
+
+	return 0;
+}
+
+static void disable_snep(void)
+{
+	rv_snep.enabled = 0;
+
+	rv_detach_trace_probe("snep", preempt_disable, handle_preempt_disable);
+	rv_detach_trace_probe("snep", preempt_enable, handle_preempt_enable);
+	rv_detach_trace_probe("snep", sched_entry_tp, handle_schedule_entry);
+	rv_detach_trace_probe("snep", sched_exit_tp, handle_schedule_exit);
+
+	da_monitor_destroy_snep();
+}
+
+static struct rv_monitor rv_snep = {
+	.name = "snep",
+	.description = "schedule does not enable preempt.",
+	.enable = enable_snep,
+	.disable = disable_snep,
+	.reset = da_monitor_reset_all_snep,
+	.enabled = 0,
+};
+
+static int __init register_snep(void)
+{
+	rv_register_monitor(&rv_snep, &rv_sched);
+	return 0;
+}
+
+static void __exit unregister_snep(void)
+{
+	rv_unregister_monitor(&rv_snep);
+}
+
+module_init(register_snep);
+module_exit(unregister_snep);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
+MODULE_DESCRIPTION("snep: schedule does not enable preempt.");