selftests/timers: Add adjtimex validation test from timetest suite

This adds a adjtimex validation test which checks the behavior
for a set of valida and invalid inputs. So far this only tests
ADJ_FREQUENCY, but hopefully will grow.

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>

2 files changed, 212 insertions, 1 deletions

diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
index d0bfb2d007cf..01b5a2ed343a 100644
--- a/tools/testing/selftests/timers/Makefile
+++ b/tools/testing/selftests/timers/Makefile
@@ -3,10 +3,12 @@ BUILD_FLAGS = -DKTEST
 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
+        set-timer-lat threadtest mqueue-lat valid-adjtimex
 
 all: ${bins}
 
+# these are all "safe" tests that don't modify
+# system time or require escalated privledges
 run_tests: all
         ./posix_timers
         ./nanosleep
@@ -16,5 +18,12 @@ run_tests: all
         ./inconsistency-check
         ./raw_skew
         ./threadtest -t 30 -n 8
+
+# these tests require escalated privledges
+# and may modify the system time or trigger
+# other behavior like suspend
+run_destructive_tests: all
+        ./valid-adjtimex
+
 clean:
         rm -f ${bins}
diff --git a/tools/testing/selftests/timers/valid-adjtimex.c b/tools/testing/selftests/timers/valid-adjtimex.c
new file mode 100644
index 000000000000..e86d937cc22c
--- /dev/null
+++ b/tools/testing/selftests/timers/valid-adjtimex.c
@@ -0,0 +1,202 @@
+/* valid adjtimex test
+ *              by: John Stultz <john.stultz@linaro.org>
+ *              (C) Copyright Linaro 2015
+ *              Licensed under the GPLv2
+ *
+ *  This test validates adjtimex interface with valid
+ *  and invalid test data.
+ *
+ *  Usage: valid-adjtimex
+ *
+ *  To build:
+ *      $ gcc valid-adjtimex.c -o valid-adjtimex -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 <time.h>
+#include <sys/time.h>
+#include <sys/timex.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.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 1000000000L
+
+/* clear NTP time_status & time_state */
+int clear_time_state(void)
+{
+        struct timex tx;
+        int ret;
+
+        tx.modes = ADJ_STATUS;
+        tx.status = 0;
+        ret = adjtimex(&tx);
+        return ret;
+}
+
+#define NUM_FREQ_VALID 32
+#define NUM_FREQ_OUTOFRANGE 4
+#define NUM_FREQ_INVALID 2
+
+long valid_freq[NUM_FREQ_VALID] = {
+        -499<<16,
+        -450<<16,
+        -400<<16,
+        -350<<16,
+        -300<<16,
+        -250<<16,
+        -200<<16,
+        -150<<16,
+        -100<<16,
+        -75<<16,
+        -50<<16,
+        -25<<16,
+        -10<<16,
+        -5<<16,
+        -1<<16,
+        -1000,
+        1<<16,
+        5<<16,
+        10<<16,
+        25<<16,
+        50<<16,
+        75<<16,
+        100<<16,
+        150<<16,
+        200<<16,
+        250<<16,
+        300<<16,
+        350<<16,
+        400<<16,
+        450<<16,
+        499<<16,
+};
+
+long outofrange_freq[NUM_FREQ_OUTOFRANGE] = {
+        -1000<<16,
+        -550<<16,
+        550<<16,
+        1000<<16,
+};
+
+#define LONG_MAX (~0UL>>1)
+#define LONG_MIN (-LONG_MAX - 1)
+
+long invalid_freq[NUM_FREQ_INVALID] = {
+        LONG_MAX,
+        LONG_MIN,
+};
+
+int validate_freq(void)
+{
+        struct timex tx;
+        int ret, pass = 0;
+        int i;
+
+        clear_time_state();
+
+        memset(&tx, 0, sizeof(struct timex));
+        /* Set the leap second insert flag */
+
+        printf("Testing ADJ_FREQ... ");
+        for (i = 0; i < NUM_FREQ_VALID; i++) {
+                tx.modes = ADJ_FREQUENCY;
+                tx.freq = valid_freq[i];
+
+                ret = adjtimex(&tx);
+                if (ret < 0) {
+                        printf("[FAIL]\n");
+                        printf("Error: adjtimex(ADJ_FREQ, %ld - %ld ppm\n",
+                                valid_freq[i], valid_freq[i]>>16);
+                        pass = -1;
+                        goto out;
+                }
+                tx.modes = 0;
+                ret = adjtimex(&tx);
+                if (tx.freq != valid_freq[i]) {
+                        printf("Warning: freq value %ld not what we set it (%ld)!\n",
+                                        tx.freq, valid_freq[i]);
+                }
+        }
+        for (i = 0; i < NUM_FREQ_OUTOFRANGE; i++) {
+                tx.modes = ADJ_FREQUENCY;
+                tx.freq = outofrange_freq[i];
+
+                ret = adjtimex(&tx);
+                if (ret < 0) {
+                        printf("[FAIL]\n");
+                        printf("Error: adjtimex(ADJ_FREQ, %ld - %ld ppm\n",
+                                outofrange_freq[i], outofrange_freq[i]>>16);
+                        pass = -1;
+                        goto out;
+                }
+                tx.modes = 0;
+                ret = adjtimex(&tx);
+                if (tx.freq == outofrange_freq[i]) {
+                        printf("[FAIL]\n");
+                        printf("ERROR: out of range value %ld actually set!\n",
+                                        tx.freq);
+                        pass = -1;
+                        goto out;
+                }
+        }
+
+
+        if (sizeof(long) == 8) { /* this case only applies to 64bit systems */
+                for (i = 0; i < NUM_FREQ_INVALID; i++) {
+                        tx.modes = ADJ_FREQUENCY;
+                        tx.freq = invalid_freq[i];
+                        ret = adjtimex(&tx);
+                        if (ret >= 0) {
+                                printf("[FAIL]\n");
+                                printf("Error: No failure on invalid ADJ_FREQUENCY %ld\n",
+                                        invalid_freq[i]);
+                                pass = -1;
+                                goto out;
+                        }
+                }
+        }
+
+        printf("[OK]\n");
+out:
+        /* reset freq to zero */
+        tx.modes = ADJ_FREQUENCY;
+        tx.freq = 0;
+        ret = adjtimex(&tx);
+
+        return pass;
+}
+
+
+int main(int argc, char **argv)
+{
+        if (validate_freq())
+                return ksft_exit_fail();
+
+        return ksft_exit_pass();
+}