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 "scpd"
12
13 #include <trace/events/sched.h>
14 #include <trace/events/preemptirq.h>
15 #include <rv_trace.h>
16 #include <monitors/sched/sched.h>
17
18 #include "scpd.h"
19
20 static struct rv_monitor rv_scpd;
21 DECLARE_DA_MON_PER_CPU(scpd, unsigned char);
22
handle_preempt_disable(void * data,unsigned long ip,unsigned long parent_ip)23 static void handle_preempt_disable(void *data, unsigned long ip, unsigned long parent_ip)
24 {
25 da_handle_event_scpd(preempt_disable_scpd);
26 }
27
handle_preempt_enable(void * data,unsigned long ip,unsigned long parent_ip)28 static void handle_preempt_enable(void *data, unsigned long ip, unsigned long parent_ip)
29 {
30 da_handle_start_event_scpd(preempt_enable_scpd);
31 }
32
handle_schedule_entry(void * data,bool preempt,unsigned long ip)33 static void handle_schedule_entry(void *data, bool preempt, unsigned long ip)
34 {
35 da_handle_event_scpd(schedule_entry_scpd);
36 }
37
handle_schedule_exit(void * data,bool is_switch,unsigned long ip)38 static void handle_schedule_exit(void *data, bool is_switch, unsigned long ip)
39 {
40 da_handle_event_scpd(schedule_exit_scpd);
41 }
42
enable_scpd(void)43 static int enable_scpd(void)
44 {
45 int retval;
46
47 retval = da_monitor_init_scpd();
48 if (retval)
49 return retval;
50
51 rv_attach_trace_probe("scpd", preempt_disable, handle_preempt_disable);
52 rv_attach_trace_probe("scpd", preempt_enable, handle_preempt_enable);
53 rv_attach_trace_probe("scpd", sched_entry_tp, handle_schedule_entry);
54 rv_attach_trace_probe("scpd", sched_exit_tp, handle_schedule_exit);
55
56 return 0;
57 }
58
disable_scpd(void)59 static void disable_scpd(void)
60 {
61 rv_scpd.enabled = 0;
62
63 rv_detach_trace_probe("scpd", preempt_disable, handle_preempt_disable);
64 rv_detach_trace_probe("scpd", preempt_enable, handle_preempt_enable);
65 rv_detach_trace_probe("scpd", sched_entry_tp, handle_schedule_entry);
66 rv_detach_trace_probe("scpd", sched_exit_tp, handle_schedule_exit);
67
68 da_monitor_destroy_scpd();
69 }
70
71 static struct rv_monitor rv_scpd = {
72 .name = "scpd",
73 .description = "schedule called with preemption disabled.",
74 .enable = enable_scpd,
75 .disable = disable_scpd,
76 .reset = da_monitor_reset_all_scpd,
77 .enabled = 0,
78 };
79
register_scpd(void)80 static int __init register_scpd(void)
81 {
82 rv_register_monitor(&rv_scpd, &rv_sched);
83 return 0;
84 }
85
unregister_scpd(void)86 static void __exit unregister_scpd(void)
87 {
88 rv_unregister_monitor(&rv_scpd);
89 }
90
91 module_init(register_scpd);
92 module_exit(unregister_scpd);
93
94 MODULE_LICENSE("GPL");
95 MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
96 MODULE_DESCRIPTION("scpd: schedule called with preemption disabled.");
97