tools/testing/selftests/timers/alarmtimer-suspend.c

   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 "../kselftest.h"
  32
  33 #define CLOCK_REALTIME                  0
  34 #define CLOCK_MONOTONIC                 1
  35 #define CLOCK_PROCESS_CPUTIME_ID        2
  36 #define CLOCK_THREAD_CPUTIME_ID         3
  37 #define CLOCK_MONOTONIC_RAW             4
  38 #define CLOCK_REALTIME_COARSE           5
  39 #define CLOCK_MONOTONIC_COARSE          6
  40 #define CLOCK_BOOTTIME                  7
  41 #define CLOCK_REALTIME_ALARM            8
  42 #define CLOCK_BOOTTIME_ALARM            9
  43 #define CLOCK_HWSPECIFIC                10
  44 #define CLOCK_TAI                       11
  45 #define NR_CLOCKIDS                     12
  46
  47
  48 #define NSEC_PER_SEC 1000000000ULL
  49 #define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */
  50
  51 #define SUSPEND_SECS 15
  52 int alarmcount;
  53 int alarm_clock_id;
  54 struct timespec start_time;
  55
  56
  57 char *clockstring(int clockid)
  58 {
  59         switch (clockid) {
  60         case CLOCK_REALTIME:
  61                 return "CLOCK_REALTIME";
  62         case CLOCK_MONOTONIC:
  63                 return "CLOCK_MONOTONIC";
  64         case CLOCK_PROCESS_CPUTIME_ID:
  65                 return "CLOCK_PROCESS_CPUTIME_ID";
  66         case CLOCK_THREAD_CPUTIME_ID:
  67                 return "CLOCK_THREAD_CPUTIME_ID";
  68         case CLOCK_MONOTONIC_RAW:
  69                 return "CLOCK_MONOTONIC_RAW";
  70         case CLOCK_REALTIME_COARSE:
  71                 return "CLOCK_REALTIME_COARSE";
  72         case CLOCK_MONOTONIC_COARSE:
  73                 return "CLOCK_MONOTONIC_COARSE";
  74         case CLOCK_BOOTTIME:
  75                 return "CLOCK_BOOTTIME";
  76         case CLOCK_REALTIME_ALARM:
  77                 return "CLOCK_REALTIME_ALARM";
  78         case CLOCK_BOOTTIME_ALARM:
  79                 return "CLOCK_BOOTTIME_ALARM";
  80         case CLOCK_TAI:
  81                 return "CLOCK_TAI";
  82         };
  83         return "UNKNOWN_CLOCKID";
  84 }
  85
  86
  87 long long timespec_sub(struct timespec a, struct timespec b)
  88 {
  89         long long ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec;
  90
  91         ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec;
  92         return ret;
  93 }
  94
  95 int final_ret = 0;
  96
  97 void sigalarm(int signo)
  98 {
  99         long long delta_ns;
 100         struct timespec ts;
 101
 102         clock_gettime(alarm_clock_id, &ts);
 103         alarmcount++;
 104
 105         delta_ns = timespec_sub(start_time, ts);
 106         delta_ns -= NSEC_PER_SEC * SUSPEND_SECS * alarmcount;
 107
 108         printf("ALARM(%i): %ld:%ld latency: %lld ns ", alarmcount, ts.tv_sec,
 109                                                         ts.tv_nsec, delta_ns);
 110
 111         if (delta_ns > UNREASONABLE_LAT) {
 112                 printf("[FAIL]\n");
 113                 final_ret = -1;
 114         } else
 115                 printf("[OK]\n");
 116
 117 }
 118
 119 int main(void)
 120 {
 121         timer_t tm1;
 122         struct itimerspec its1, its2;
 123         struct sigevent se;
 124         struct sigaction act;
 125         int signum = SIGRTMAX;
 126
 127         /* Set up signal handler: */
 128         sigfillset(&act.sa_mask);
 129         act.sa_flags = 0;
 130         act.sa_handler = sigalarm;
 131         sigaction(signum, &act, NULL);
 132
 133         /* Set up timer: */
 134         memset(&se, 0, sizeof(se));
 135         se.sigev_notify = SIGEV_SIGNAL;
 136         se.sigev_signo = signum;
 137         se.sigev_value.sival_int = 0;
 138
 139         for (alarm_clock_id = CLOCK_REALTIME_ALARM;
 140                         alarm_clock_id <= CLOCK_BOOTTIME_ALARM;
 141                         alarm_clock_id++) {
 142
 143                 alarmcount = 0;
 144                 if (timer_create(alarm_clock_id, &se, &tm1) == -1) {
 145                         printf("timer_create failed, %s unsupported?\n",
 146                                         clockstring(alarm_clock_id));
 147                         break;
 148                 }
 149
 150                 clock_gettime(alarm_clock_id, &start_time);
 151                 printf("Start time (%s): %ld:%ld\n", clockstring(alarm_clock_id),
 152                                 start_time.tv_sec, start_time.tv_nsec);
 153                 printf("Setting alarm for every %i seconds\n", SUSPEND_SECS);
 154                 its1.it_value = start_time;
 155                 its1.it_value.tv_sec += SUSPEND_SECS;
 156                 its1.it_interval.tv_sec = SUSPEND_SECS;
 157                 its1.it_interval.tv_nsec = 0;
 158
 159                 timer_settime(tm1, TIMER_ABSTIME, &its1, &its2);
 160
 161                 while (alarmcount < 5)
 162                         sleep(1); /* First 5 alarms, do nothing */
 163
 164                 printf("Starting suspend loops\n");
 165                 while (alarmcount < 10) {
 166                         int ret;
 167
 168                         sleep(3);
 169                         ret = system("echo mem > /sys/power/state");
 170                         if (ret)
 171                                 break;
 172                 }
 173                 timer_delete(tm1);
 174         }
 175         if (final_ret)
 176                 return ksft_exit_fail();
 177         return ksft_exit_pass();
 178 }