selftests/timers: Add change_skew test from timetest suite

This patch adds the change_skew test which validates the
adjtimex freq can be set to various values and then using
the inconsistency-check, raw_skew, and nanosleep tests
ensures time behaves properly.

Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Tested-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
index 61a39ec..55b74cc 100644 (file)
--- a/tools/testing/selftests/timers/Makefile
+++ b/tools/testing/selftests/timers/Makefile
@@ -4,7 +4,7 @@ CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS)
 LDFLAGS += -lrt -lpthread
 bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \
        set-timer-lat threadtest mqueue-lat valid-adjtimex \
-       alarmtimer-suspend
+       alarmtimer-suspend change_skew
 
 all: ${bins}
 
@@ -26,6 +26,7 @@ run_tests: all
 run_destructive_tests: run_tests
        ./alarmtimer-suspend
        ./valid-adjtimex
+       ./change_skew
 
 clean:
        rm -f ${bins}

diff --git a/tools/testing/selftests/timers/change_skew.c b/tools/testing/selftests/timers/change_skew.c
new file mode 100644 (file)
index 0000000..cb19689
--- /dev/null
+++ b/tools/testing/selftests/timers/change_skew.c
@@ -0,0 +1,107 @@
+/* ADJ_FREQ Skew change test
+ *             by: john stultz (johnstul@us.ibm.com)
+ *             (C) Copyright IBM 2012
+ *             Licensed under the GPLv2
+ *
+ *  NOTE: This is a meta-test which cranks the ADJ_FREQ knob and
+ *  then uses other tests to detect problems. Thus this test requires
+ *  that the raw_skew, inconsistency-check and nanosleep tests be
+ *  present in the same directory it is run from.
+ *
+ *  To build:
+ *     $ gcc change_skew.c -o change_skew -lrt
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <sys/timex.h>
+#include <time.h>
+#ifdef KTEST
+#include "../kselftest.h"
+#else
+static inline int ksft_exit_pass(void)
+{
+       exit(0);
+}
+static inline int ksft_exit_fail(void)
+{
+       exit(1);
+}
+#endif
+
+#define NSEC_PER_SEC 1000000000LL
+
+
+int change_skew_test(int ppm)
+{
+       struct timex tx;
+       int ret;
+
+       tx.modes = ADJ_FREQUENCY;
+       tx.freq = ppm << 16;
+
+       ret = adjtimex(&tx);
+       if (ret < 0) {
+               printf("Error adjusting freq\n");
+               return ret;
+       }
+
+       ret = system("./raw_skew");
+       ret |= system("./inconsistency-check");
+       ret |= system("./nanosleep");
+
+       return ret;
+}
+
+
+int main(int argv, char **argc)
+{
+       struct timex tx;
+       int i, ret;
+
+       int ppm[5] = {0, 250, 500, -250, -500};
+
+       /* Kill ntpd */
+       ret = system("killall -9 ntpd");
+
+       /* Make sure there's no offset adjustment going on */
+       tx.modes = ADJ_OFFSET;
+       tx.offset = 0;
+       ret = adjtimex(&tx);
+
+       if (ret < 0) {
+               printf("Maybe you're not running as root?\n");
+               return -1;
+       }
+
+       for (i = 0; i < 5; i++) {
+               printf("Using %i ppm adjustment\n", ppm[i]);
+               ret = change_skew_test(ppm[i]);
+               if (ret)
+                       break;
+       }
+
+       /* Set things back */
+       tx.modes = ADJ_FREQUENCY;
+       tx.offset = 0;
+       adjtimex(&tx);
+
+       if (ret) {
+               printf("[FAIL]");
+               return ksft_exit_fail();
+       }
+       printf("[OK]");
+       return ksft_exit_pass();
+}