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; |
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(a: start_time, b: 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(clockid: alarm_clock_id)); |
147 | break; |
148 | } |
149 | |
150 | clock_gettime(alarm_clock_id, &start_time); |
151 | printf("Start time (%s): %ld:%ld\n" , clockstring(clockid: 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 | } |
179 | |