sco.c

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/ftrace.h>
 3#include <linux/tracepoint.h>
 4#include <linux/kernel.h>
 5#include <linux/module.h>
 6#include <linux/init.h>
 7#include <linux/rv.h>
 8#include <rv/instrumentation.h>
 9#include <rv/da_monitor.h>
10
11#define MODULE_NAME "sco"
12
13#include <trace/events/sched.h>
14#include <rv_trace.h>
15#include <monitors/sched/sched.h>
16
17#include "sco.h"
18
19static struct rv_monitor rv_sco;
20DECLARE_DA_MON_PER_CPU(sco, unsigned char);
21
22static void handle_sched_set_state(void *data, struct task_struct *tsk, int state)
23{
24	da_handle_start_event_sco(sched_set_state_sco);
25}
26
27static void handle_schedule_entry(void *data, bool preempt)
28{
29	da_handle_event_sco(schedule_entry_sco);
30}
31
32static void handle_schedule_exit(void *data, bool is_switch)
33{
34	da_handle_start_event_sco(schedule_exit_sco);
35}
36
37static int enable_sco(void)
38{
39	int retval;
40
41	retval = da_monitor_init_sco();
42	if (retval)
43		return retval;
44
45	rv_attach_trace_probe("sco", sched_set_state_tp, handle_sched_set_state);
46	rv_attach_trace_probe("sco", sched_entry_tp, handle_schedule_entry);
47	rv_attach_trace_probe("sco", sched_exit_tp, handle_schedule_exit);
48
49	return 0;
50}
51
52static void disable_sco(void)
53{
54	rv_sco.enabled = 0;
55
56	rv_detach_trace_probe("sco", sched_set_state_tp, handle_sched_set_state);
57	rv_detach_trace_probe("sco", sched_entry_tp, handle_schedule_entry);
58	rv_detach_trace_probe("sco", sched_exit_tp, handle_schedule_exit);
59
60	da_monitor_destroy_sco();
61}
62
63static struct rv_monitor rv_sco = {
64	.name = "sco",
65	.description = "scheduling context operations.",
66	.enable = enable_sco,
67	.disable = disable_sco,
68	.reset = da_monitor_reset_all_sco,
69	.enabled = 0,
70};
71
72static int __init register_sco(void)
73{
74	return rv_register_monitor(&rv_sco, &rv_sched);
75}
76
77static void __exit unregister_sco(void)
78{
79	rv_unregister_monitor(&rv_sco);
80}
81
82module_init(register_sco);
83module_exit(unregister_sco);
84
85MODULE_LICENSE("GPL");
86MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
87MODULE_DESCRIPTION("sco: scheduling context operations.");