1 files changed, 91 insertions, 0 deletions
diff --git a/kernel/trace/rv/monitors/tss/tss.c b/kernel/trace/rv/monitors/tss/tss.c
new file mode 100644
index 000000000000..542787e6524f
--- /dev/null
+++ b/kernel/trace/rv/monitors/tss/tss.c
@@ -0,0 +1,91 @@
+// 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 "tss"
+
+#include <trace/events/sched.h>
+#include <rv_trace.h>
+#include <monitors/sched/sched.h>
+
+#include "tss.h"
+
+static struct rv_monitor rv_tss;
+DECLARE_DA_MON_PER_CPU(tss, unsigned char);
+
+static void handle_sched_switch(void *data, bool preempt,
+				struct task_struct *prev,
+				struct task_struct *next,
+				unsigned int prev_state)
+{
+	da_handle_event_tss(sched_switch_tss);
+}
+
+static void handle_schedule_entry(void *data, bool preempt, unsigned long ip)
+{
+	da_handle_event_tss(schedule_entry_tss);
+}
+
+static void handle_schedule_exit(void *data, bool is_switch, unsigned long ip)
+{
+	da_handle_start_event_tss(schedule_exit_tss);
+}
+
+static int enable_tss(void)
+{
+	int retval;
+
+	retval = da_monitor_init_tss();
+	if (retval)
+		return retval;
+
+	rv_attach_trace_probe("tss", sched_switch, handle_sched_switch);
+	rv_attach_trace_probe("tss", sched_entry_tp, handle_schedule_entry);
+	rv_attach_trace_probe("tss", sched_exit_tp, handle_schedule_exit);
+
+	return 0;
+}
+
+static void disable_tss(void)
+{
+	rv_tss.enabled = 0;
+
+	rv_detach_trace_probe("tss", sched_switch, handle_sched_switch);
+	rv_detach_trace_probe("tss", sched_entry_tp, handle_schedule_entry);
+	rv_detach_trace_probe("tss", sched_exit_tp, handle_schedule_exit);
+
+	da_monitor_destroy_tss();
+}
+
+static struct rv_monitor rv_tss = {
+	.name = "tss",
+	.description = "task switch while scheduling.",
+	.enable = enable_tss,
+	.disable = disable_tss,
+	.reset = da_monitor_reset_all_tss,
+	.enabled = 0,
+};
+
+static int __init register_tss(void)
+{
+	rv_register_monitor(&rv_tss, &rv_sched);
+	return 0;
+}
+
+static void __exit unregister_tss(void)
+{
+	rv_unregister_monitor(&rv_tss);
+}
+
+module_init(register_tss);
+module_exit(unregister_tss);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
+MODULE_DESCRIPTION("tss: task switch while scheduling.");