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 "wwnr"
12
13#include <trace/events/rv.h>
14#include <trace/events/sched.h>
15
16#include "wwnr.h"
17
18static struct rv_monitor rv_wwnr;
19DECLARE_DA_MON_PER_TASK(wwnr, unsigned char);
20
21static void handle_switch(void *data, bool preempt, struct task_struct *p,
22			  struct task_struct *n, unsigned int prev_state)
23{
24	/* start monitoring only after the first suspension */
25	if (prev_state == TASK_INTERRUPTIBLE)
26		da_handle_start_event_wwnr(p, switch_out_wwnr);
27	else
28		da_handle_event_wwnr(p, switch_out_wwnr);
29
30	da_handle_event_wwnr(n, switch_in_wwnr);
31}
32
33static void handle_wakeup(void *data, struct task_struct *p)
34{
35	da_handle_event_wwnr(p, wakeup_wwnr);
36}
37
38static int enable_wwnr(void)
39{
40	int retval;
41
42	retval = da_monitor_init_wwnr();
43	if (retval)
44		return retval;
45
46	rv_attach_trace_probe("wwnr", sched_switch, handle_switch);
47	rv_attach_trace_probe("wwnr", sched_wakeup, handle_wakeup);
48
49	return 0;
50}
51
52static void disable_wwnr(void)
53{
54	rv_wwnr.enabled = 0;
55
56	rv_detach_trace_probe("wwnr", sched_switch, handle_switch);
57	rv_detach_trace_probe("wwnr", sched_wakeup, handle_wakeup);
58
59	da_monitor_destroy_wwnr();
60}
61
62static struct rv_monitor rv_wwnr = {
63	.name = "wwnr",
64	.description = "wakeup while not running per-task testing model.",
65	.enable = enable_wwnr,
66	.disable = disable_wwnr,
67	.reset = da_monitor_reset_all_wwnr,
68	.enabled = 0,
69};
70
71static int __init register_wwnr(void)
72{
73	rv_register_monitor(&rv_wwnr);
74	return 0;
75}
76
77static void __exit unregister_wwnr(void)
78{
79	rv_unregister_monitor(&rv_wwnr);
80}
81
82module_init(register_wwnr);
83module_exit(unregister_wwnr);
84
85MODULE_LICENSE("GPL");
86MODULE_AUTHOR("Daniel Bristot de Oliveira <bristot@kernel.org>");
87MODULE_DESCRIPTION("wwnr: wakeup while not running monitor");
88