John Stultz | b7bb844 | 2015-03-11 17:40:07 -0700 | [diff] [blame] | 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 |
John Stultz | acd5705 | 2015-05-13 15:13:04 -0700 | [diff] [blame^] | 60 | #define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */ |
John Stultz | b7bb844 | 2015-03-11 17:40:07 -0700 | [diff] [blame] | 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 | timer_create(alarm_clock_id, &se, &tm1); |
| 156 | |
| 157 | clock_gettime(alarm_clock_id, &start_time); |
| 158 | printf("Start time (%s): %ld:%ld\n", clockstring(alarm_clock_id), |
| 159 | start_time.tv_sec, start_time.tv_nsec); |
| 160 | printf("Setting alarm for every %i seconds\n", SUSPEND_SECS); |
| 161 | its1.it_value = start_time; |
| 162 | its1.it_value.tv_sec += SUSPEND_SECS; |
| 163 | its1.it_interval.tv_sec = SUSPEND_SECS; |
| 164 | its1.it_interval.tv_nsec = 0; |
| 165 | |
| 166 | timer_settime(tm1, TIMER_ABSTIME, &its1, &its2); |
| 167 | |
| 168 | while (alarmcount < 5) |
| 169 | sleep(1); /* First 5 alarms, do nothing */ |
| 170 | |
| 171 | printf("Starting suspend loops\n"); |
| 172 | while (alarmcount < 10) { |
| 173 | int ret; |
| 174 | |
John Stultz | 859b1be | 2015-05-13 15:13:03 -0700 | [diff] [blame] | 175 | sleep(3); |
John Stultz | b7bb844 | 2015-03-11 17:40:07 -0700 | [diff] [blame] | 176 | ret = system("echo mem > /sys/power/state"); |
| 177 | if (ret) |
| 178 | break; |
| 179 | } |
| 180 | timer_delete(tm1); |
| 181 | } |
| 182 | if (final_ret) |
| 183 | return ksft_exit_fail(); |
| 184 | return ksft_exit_pass(); |
| 185 | } |