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 "sssw"
12
13 #include <trace/events/sched.h>
14 #include <trace/events/signal.h>
15 #include <rv_trace.h>
16 #include <monitors/sched/sched.h>
17
18 #include "sssw.h"
19
20 static struct rv_monitor rv_sssw;
21 DECLARE_DA_MON_PER_TASK(sssw, unsigned char);
22
handle_sched_set_state(void * data,struct task_struct * tsk,int state)23 static void handle_sched_set_state(void *data, struct task_struct *tsk, int state)
24 {
25 if (state == TASK_RUNNING)
26 da_handle_start_event_sssw(tsk, sched_set_state_runnable_sssw);
27 else
28 da_handle_event_sssw(tsk, sched_set_state_sleepable_sssw);
29 }
30
handle_sched_switch(void * data,bool preempt,struct task_struct * prev,struct task_struct * next,unsigned int prev_state)31 static void handle_sched_switch(void *data, bool preempt,
32 struct task_struct *prev,
33 struct task_struct *next,
34 unsigned int prev_state)
35 {
36 if (preempt)
37 da_handle_event_sssw(prev, sched_switch_preempt_sssw);
38 else if (prev_state == TASK_RUNNING)
39 da_handle_event_sssw(prev, sched_switch_yield_sssw);
40 else if (prev_state == TASK_RTLOCK_WAIT)
41 /* special case of sleeping task with racy conditions */
42 da_handle_event_sssw(prev, sched_switch_blocking_sssw);
43 else
44 da_handle_event_sssw(prev, sched_switch_suspend_sssw);
45 da_handle_event_sssw(next, sched_switch_in_sssw);
46 }
47
handle_sched_wakeup(void * data,struct task_struct * p)48 static void handle_sched_wakeup(void *data, struct task_struct *p)
49 {
50 /*
51 * Wakeup can also lead to signal_wakeup although the system is
52 * actually runnable. The monitor can safely start with this event.
53 */
54 da_handle_start_event_sssw(p, sched_wakeup_sssw);
55 }
56
handle_signal_deliver(void * data,int sig,struct kernel_siginfo * info,struct k_sigaction * ka)57 static void handle_signal_deliver(void *data, int sig,
58 struct kernel_siginfo *info,
59 struct k_sigaction *ka)
60 {
61 da_handle_event_sssw(current, signal_deliver_sssw);
62 }
63
enable_sssw(void)64 static int enable_sssw(void)
65 {
66 int retval;
67
68 retval = da_monitor_init_sssw();
69 if (retval)
70 return retval;
71
72 rv_attach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state);
73 rv_attach_trace_probe("sssw", sched_switch, handle_sched_switch);
74 rv_attach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup);
75 rv_attach_trace_probe("sssw", signal_deliver, handle_signal_deliver);
76
77 return 0;
78 }
79
disable_sssw(void)80 static void disable_sssw(void)
81 {
82 rv_sssw.enabled = 0;
83
84 rv_detach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state);
85 rv_detach_trace_probe("sssw", sched_switch, handle_sched_switch);
86 rv_detach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup);
87 rv_detach_trace_probe("sssw", signal_deliver, handle_signal_deliver);
88
89 da_monitor_destroy_sssw();
90 }
91
92 static struct rv_monitor rv_sssw = {
93 .name = "sssw",
94 .description = "set state sleep and wakeup.",
95 .enable = enable_sssw,
96 .disable = disable_sssw,
97 .reset = da_monitor_reset_all_sssw,
98 .enabled = 0,
99 };
100
register_sssw(void)101 static int __init register_sssw(void)
102 {
103 return rv_register_monitor(&rv_sssw, &rv_sched);
104 }
105
unregister_sssw(void)106 static void __exit unregister_sssw(void)
107 {
108 rv_unregister_monitor(&rv_sssw);
109 }
110
111 module_init(register_sssw);
112 module_exit(unregister_sssw);
113
114 MODULE_LICENSE("GPL");
115 MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
116 MODULE_DESCRIPTION("sssw: set state sleep and wakeup.");
117