1 /* alarmtimer suspend test 2 * John Stultz (john.stultz@linaro.org) 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 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 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 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 } 104 105 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