linux-kernel - [PATCH 12/19] selftests/timers: Add change

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Message-Id: <1424903544-26855-13-git-send-email-john.stultz@linaro.org>
Date:	Wed, 25 Feb 2015 14:32:17 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Shuah Khan <shuahkh@....samsung.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Richard Cochran <richardcochran@...il.com>
Subject: [PATCH 12/19] 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@....samsung.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Richard Cochran <richardcochran@...il.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 tools/testing/selftests/timers/Makefile      |  3 +-
 tools/testing/selftests/timers/change_skew.c | 93 ++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/timers/change_skew.c

diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
index 4e3eef6..c3e32f1 100644
--- a/tools/testing/selftests/timers/Makefile
+++ b/tools/testing/selftests/timers/Makefile
@@ -2,7 +2,7 @@ CFLAGS += -O3 -Wl,-no-as-needed
 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}
 
@@ -24,6 +24,7 @@ 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
index 0000000..454cfca
--- /dev/null
+++ b/tools/testing/selftests/timers/change_skew.c
@@ -0,0 +1,93 @@
+/* ADJ_FREQ Skew change test
+ *		by: john stultz (johnstul@...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 <sys/time.h>
+#include <sys/timex.h>
+#include <time.h>
+
+#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 */
+	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]");
+	else
+		printf("[OK]");
+	return ret;
+}
-- 
1.9.1

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