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

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  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 #ifdef KTEST
 32 #include "../kselftest.h"
 33 #else
 34 static inline int ksft_exit_pass(void)
 35 {
 36         exit(0);
 37 }
 38 static inline int ksft_exit_fail(void)
 39 {
 40         exit(1);
 41 }
 42 #endif
 43 
 44 #define CLOCK_REALTIME                  0
 45 #define CLOCK_MONOTONIC                 1
 46 #define CLOCK_PROCESS_CPUTIME_ID        2
 47 #define CLOCK_THREAD_CPUTIME_ID         3
 48 #define CLOCK_MONOTONIC_RAW             4
 49 #define CLOCK_REALTIME_COARSE           5
 50 #define CLOCK_MONOTONIC_COARSE          6
 51 #define CLOCK_BOOTTIME                  7
 52 #define CLOCK_REALTIME_ALARM            8
 53 #define CLOCK_BOOTTIME_ALARM            9
 54 #define CLOCK_HWSPECIFIC                10
 55 #define CLOCK_TAI                       11
 56 #define NR_CLOCKIDS                     12
 57 
 58 
 59 #define NSEC_PER_SEC 1000000000ULL
 60 #define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */
 61 
 62 #define SUSPEND_SECS 15
 63 int alarmcount;
 64 int alarm_clock_id;
 65 struct timespec start_time;
 66 
 67 
 68 char *clockstring(int clockid)
 69 {
 70         switch (clockid) {
 71         case CLOCK_REALTIME:
 72                 return "CLOCK_REALTIME";
 73         case CLOCK_MONOTONIC:
 74                 return "CLOCK_MONOTONIC";
 75         case CLOCK_PROCESS_CPUTIME_ID:
 76                 return "CLOCK_PROCESS_CPUTIME_ID";
 77         case CLOCK_THREAD_CPUTIME_ID:
 78                 return "CLOCK_THREAD_CPUTIME_ID";
 79         case CLOCK_MONOTONIC_RAW:
 80                 return "CLOCK_MONOTONIC_RAW";
 81         case CLOCK_REALTIME_COARSE:
 82                 return "CLOCK_REALTIME_COARSE";
 83         case CLOCK_MONOTONIC_COARSE:
 84                 return "CLOCK_MONOTONIC_COARSE";
 85         case CLOCK_BOOTTIME:
 86                 return "CLOCK_BOOTTIME";
 87         case CLOCK_REALTIME_ALARM:
 88                 return "CLOCK_REALTIME_ALARM";
 89         case CLOCK_BOOTTIME_ALARM:
 90                 return "CLOCK_BOOTTIME_ALARM";
 91         case CLOCK_TAI:
 92                 return "CLOCK_TAI";
 93         };
 94         return "UNKNOWN_CLOCKID";
 95 }
 96 
 97 
 98 long long timespec_sub(struct timespec a, struct timespec b)
 99 {
100         long long ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec;
101 
102         ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec;
103         return ret;
104 }
105 
106 int final_ret = 0;
107 
108 void sigalarm(int signo)
109 {
110         long long delta_ns;
111         struct timespec ts;
112 
113         clock_gettime(alarm_clock_id, &ts);
114         alarmcount++;
115 
116         delta_ns = timespec_sub(start_time, ts);
117         delta_ns -= NSEC_PER_SEC * SUSPEND_SECS * alarmcount;
118 
119         printf("ALARM(%i): %ld:%ld latency: %lld ns ", alarmcount, ts.tv_sec,
120                                                         ts.tv_nsec, delta_ns);
121 
122         if (delta_ns > UNREASONABLE_LAT) {
123                 printf("[FAIL]\n");
124                 final_ret = -1;
125         } else
126                 printf("[OK]\n");
127 
128 }
129 
130 int main(void)
131 {
132         timer_t tm1;
133         struct itimerspec its1, its2;
134         struct sigevent se;
135         struct sigaction act;
136         int signum = SIGRTMAX;
137 
138         /* Set up signal handler: */
139         sigfillset(&act.sa_mask);
140         act.sa_flags = 0;
141         act.sa_handler = sigalarm;
142         sigaction(signum, &act, NULL);
143 
144         /* Set up timer: */
145         memset(&se, 0, sizeof(se));
146         se.sigev_notify = SIGEV_SIGNAL;
147         se.sigev_signo = signum;
148         se.sigev_value.sival_int = 0;
149 
150         for (alarm_clock_id = CLOCK_REALTIME_ALARM;
151                         alarm_clock_id <= CLOCK_BOOTTIME_ALARM;
152                         alarm_clock_id++) {
153 
154                 alarmcount = 0;
155                 if (timer_create(alarm_clock_id, &se, &tm1) == -1) {
156                         printf("timer_create failled, %s unspported?\n",
157                                         clockstring(alarm_clock_id));
158                         break;
159                 }
160 
161                 clock_gettime(alarm_clock_id, &start_time);
162                 printf("Start time (%s): %ld:%ld\n", clockstring(alarm_clock_id),
163                                 start_time.tv_sec, start_time.tv_nsec);
164                 printf("Setting alarm for every %i seconds\n", SUSPEND_SECS);
165                 its1.it_value = start_time;
166                 its1.it_value.tv_sec += SUSPEND_SECS;
167                 its1.it_interval.tv_sec = SUSPEND_SECS;
168                 its1.it_interval.tv_nsec = 0;
169 
170                 timer_settime(tm1, TIMER_ABSTIME, &its1, &its2);
171 
172                 while (alarmcount < 5)
173                         sleep(1); /* First 5 alarms, do nothing */
174 
175                 printf("Starting suspend loops\n");
176                 while (alarmcount < 10) {
177                         int ret;
178 
179                         sleep(3);
180                         ret = system("echo mem > /sys/power/state");
181                         if (ret)
182                                 break;
183                 }
184                 timer_delete(tm1);
185         }
186         if (final_ret)
187                 return ksft_exit_fail();
188         return ksft_exit_pass();
189 }
190 

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