1 /* alarmtimer suspend test
2 * John Stultz ([email protected])
3 * (C) Copyright Linaro 2013
4 * Licensed under the GPLv2
5 *
6 * This test makes sure the alarmtimer & RTC wakeup code is
7 * functioning.
8 *
9 * To build:
10 * $ gcc alarmtimer-suspend.c -o alarmtimer-suspend -lrt
11 *
12 * This program is free software: you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 */
22
23
24 #include <stdio.h>
25 #include <unistd.h>
26 #include <time.h>
27 #include <string.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <pthread.h>
31 #include <include/vdso/time64.h>
32 #include <errno.h>
33 #include "../kselftest.h"
34
35 #define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */
36
37 #define SUSPEND_SECS 15
38 int alarmcount;
39 int alarm_clock_id;
40 struct timespec start_time;
41
42
clockstring(int clockid)43 char *clockstring(int clockid)
44 {
45 switch (clockid) {
46 case CLOCK_REALTIME:
47 return "CLOCK_REALTIME";
48 case CLOCK_MONOTONIC:
49 return "CLOCK_MONOTONIC";
50 case CLOCK_PROCESS_CPUTIME_ID:
51 return "CLOCK_PROCESS_CPUTIME_ID";
52 case CLOCK_THREAD_CPUTIME_ID:
53 return "CLOCK_THREAD_CPUTIME_ID";
54 case CLOCK_MONOTONIC_RAW:
55 return "CLOCK_MONOTONIC_RAW";
56 case CLOCK_REALTIME_COARSE:
57 return "CLOCK_REALTIME_COARSE";
58 case CLOCK_MONOTONIC_COARSE:
59 return "CLOCK_MONOTONIC_COARSE";
60 case CLOCK_BOOTTIME:
61 return "CLOCK_BOOTTIME";
62 case CLOCK_REALTIME_ALARM:
63 return "CLOCK_REALTIME_ALARM";
64 case CLOCK_BOOTTIME_ALARM:
65 return "CLOCK_BOOTTIME_ALARM";
66 case CLOCK_TAI:
67 return "CLOCK_TAI";
68 }
69 return "UNKNOWN_CLOCKID";
70 }
71
72
timespec_sub(struct timespec a,struct timespec b)73 long long timespec_sub(struct timespec a, struct timespec b)
74 {
75 long long ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec;
76
77 ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec;
78 return ret;
79 }
80
81 int final_ret;
82
sigalarm(int signo)83 void sigalarm(int signo)
84 {
85 long long delta_ns;
86 struct timespec ts;
87
88 clock_gettime(alarm_clock_id, &ts);
89 alarmcount++;
90
91 delta_ns = timespec_sub(start_time, ts);
92 delta_ns -= NSEC_PER_SEC * SUSPEND_SECS * alarmcount;
93
94 printf("ALARM(%i): %ld:%ld latency: %lld ns ", alarmcount, ts.tv_sec,
95 ts.tv_nsec, delta_ns);
96
97 if (delta_ns > UNREASONABLE_LAT) {
98 printf("[FAIL]\n");
99 final_ret = -1;
100 } else
101 printf("[OK]\n");
102
103 }
104
main(void)105 int main(void)
106 {
107 timer_t tm1;
108 struct itimerspec its1, its2;
109 struct sigevent se;
110 struct sigaction act;
111 int signum = SIGRTMAX;
112
113 /* Set up signal handler: */
114 sigfillset(&act.sa_mask);
115 act.sa_flags = 0;
116 act.sa_handler = sigalarm;
117 sigaction(signum, &act, NULL);
118
119 /* Set up timer: */
120 memset(&se, 0, sizeof(se));
121 se.sigev_notify = SIGEV_SIGNAL;
122 se.sigev_signo = signum;
123 se.sigev_value.sival_int = 0;
124
125 for (alarm_clock_id = CLOCK_REALTIME_ALARM;
126 alarm_clock_id <= CLOCK_BOOTTIME_ALARM;
127 alarm_clock_id++) {
128
129 alarmcount = 0;
130 if (timer_create(alarm_clock_id, &se, &tm1) == -1) {
131 printf("timer_create failed, %s unsupported?: %s\n",
132 clockstring(alarm_clock_id), strerror(errno));
133 break;
134 }
135
136 clock_gettime(alarm_clock_id, &start_time);
137 printf("Start time (%s): %ld:%ld\n", clockstring(alarm_clock_id),
138 start_time.tv_sec, start_time.tv_nsec);
139 printf("Setting alarm for every %i seconds\n", SUSPEND_SECS);
140 its1.it_value = start_time;
141 its1.it_value.tv_sec += SUSPEND_SECS;
142 its1.it_interval.tv_sec = SUSPEND_SECS;
143 its1.it_interval.tv_nsec = 0;
144
145 timer_settime(tm1, TIMER_ABSTIME, &its1, &its2);
146
147 while (alarmcount < 5)
148 sleep(1); /* First 5 alarms, do nothing */
149
150 printf("Starting suspend loops\n");
151 while (alarmcount < 10) {
152 int ret;
153
154 sleep(3);
155 ret = system("echo mem > /sys/power/state");
156 if (ret)
157 break;
158 }
159 timer_delete(tm1);
160 }
161 if (final_ret)
162 ksft_exit_fail();
163 ksft_exit_pass();
164 }
165