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Message-Id: <20201026114945.48532-6-vincenzo.frascino@arm.com>
Date: Mon, 26 Oct 2020 11:49:45 +0000
From: Vincenzo Frascino <vincenzo.frascino@....com>
To: linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc: Vincenzo Frascino <vincenzo.frascino@....com>,
Shuah Khan <shuah@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Andy Lutomirski <luto@...nel.org>,
Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v4 5/5] kselftest: Extend vdso correctness test to clock_gettime64
With the release of Linux 5.1 has been added a new syscall,
clock_gettime64, that provided a 64 bit time value for a specified
clock_ID to make the kernel Y2038 safe on 32 bit architectures.
Extend the vdso correctness test to cover the newly exposed vdso
function.
Cc: Shuah Khan <shuah@...nel.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
---
tools/testing/selftests/vDSO/vdso_config.h | 4 +-
.../selftests/vDSO/vdso_test_correctness.c | 115 +++++++++++++++++-
2 files changed, 115 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/vDSO/vdso_config.h b/tools/testing/selftests/vDSO/vdso_config.h
index eeb725df6045..6a6fe8d4ff55 100644
--- a/tools/testing/selftests/vDSO/vdso_config.h
+++ b/tools/testing/selftests/vDSO/vdso_config.h
@@ -66,12 +66,13 @@ static const char *versions[6] = {
"LINUX_4.15",
};
-static const char *names[2][5] = {
+static const char *names[2][6] = {
{
"__kernel_gettimeofday",
"__kernel_clock_gettime",
"__kernel_time",
"__kernel_clock_getres",
+ "__kernel_getcpu",
#if defined(VDSO_32BIT)
"__kernel_clock_gettime64",
#endif
@@ -81,6 +82,7 @@ static const char *names[2][5] = {
"__vdso_clock_gettime",
"__vdso_time",
"__vdso_clock_getres",
+ "__vdso_getcpu",
#if defined(VDSO_32BIT)
"__vdso_clock_gettime64",
#endif
diff --git a/tools/testing/selftests/vDSO/vdso_test_correctness.c b/tools/testing/selftests/vDSO/vdso_test_correctness.c
index 42052db0f870..5029ef9b228c 100644
--- a/tools/testing/selftests/vDSO/vdso_test_correctness.c
+++ b/tools/testing/selftests/vDSO/vdso_test_correctness.c
@@ -19,6 +19,10 @@
#include <stdbool.h>
#include <limits.h>
+#include "vdso_config.h"
+
+static const char **name;
+
#ifndef SYS_getcpu
# ifdef __x86_64__
# define SYS_getcpu 309
@@ -27,6 +31,17 @@
# endif
#endif
+#ifndef __NR_clock_gettime64
+#define __NR_clock_gettime64 403
+#endif
+
+#ifndef __kernel_timespec
+struct __kernel_timespec {
+ long long tv_sec;
+ long long tv_nsec;
+};
+#endif
+
/* max length of lines in /proc/self/maps - anything longer is skipped here */
#define MAPS_LINE_LEN 128
@@ -36,6 +51,10 @@ typedef int (*vgettime_t)(clockid_t, struct timespec *);
vgettime_t vdso_clock_gettime;
+typedef int (*vgettime64_t)(clockid_t, struct __kernel_timespec *);
+
+vgettime64_t vdso_clock_gettime64;
+
typedef long (*vgtod_t)(struct timeval *tv, struct timezone *tz);
vgtod_t vdso_gettimeofday;
@@ -99,17 +118,23 @@ static void fill_function_pointers()
return;
}
- vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu");
+ vdso_getcpu = (getcpu_t)dlsym(vdso, name[4]);
if (!vdso_getcpu)
printf("Warning: failed to find getcpu in vDSO\n");
vgetcpu = (getcpu_t) vsyscall_getcpu();
- vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
+ vdso_clock_gettime = (vgettime_t)dlsym(vdso, name[1]);
if (!vdso_clock_gettime)
printf("Warning: failed to find clock_gettime in vDSO\n");
- vdso_gettimeofday = (vgtod_t)dlsym(vdso, "__vdso_gettimeofday");
+#if defined(VDSO_32BIT)
+ vdso_clock_gettime64 = (vgettime64_t)dlsym(vdso, name[5]);
+ if (!vdso_clock_gettime64)
+ printf("Warning: failed to find clock_gettime64 in vDSO\n");
+#endif
+
+ vdso_gettimeofday = (vgtod_t)dlsym(vdso, name[0]);
if (!vdso_gettimeofday)
printf("Warning: failed to find gettimeofday in vDSO\n");
@@ -126,6 +151,11 @@ static inline int sys_clock_gettime(clockid_t id, struct timespec *ts)
return syscall(__NR_clock_gettime, id, ts);
}
+static inline int sys_clock_gettime64(clockid_t id, struct __kernel_timespec *ts)
+{
+ return syscall(__NR_clock_gettime64, id, ts);
+}
+
static inline int sys_gettimeofday(struct timeval *tv, struct timezone *tz)
{
return syscall(__NR_gettimeofday, tv, tz);
@@ -191,6 +221,15 @@ static bool ts_leq(const struct timespec *a, const struct timespec *b)
return a->tv_nsec <= b->tv_nsec;
}
+static bool ts64_leq(const struct __kernel_timespec *a,
+ const struct __kernel_timespec *b)
+{
+ if (a->tv_sec != b->tv_sec)
+ return a->tv_sec < b->tv_sec;
+ else
+ return a->tv_nsec <= b->tv_nsec;
+}
+
static bool tv_leq(const struct timeval *a, const struct timeval *b)
{
if (a->tv_sec != b->tv_sec)
@@ -254,7 +293,10 @@ static void test_one_clock_gettime(int clock, const char *name)
if (!ts_leq(&start, &vdso) || !ts_leq(&vdso, &end)) {
printf("[FAIL]\tTimes are out of sequence\n");
nerrs++;
+ return;
}
+
+ printf("[OK]\tTest Passed.\n");
}
static void test_clock_gettime(void)
@@ -275,6 +317,70 @@ static void test_clock_gettime(void)
test_one_clock_gettime(INT_MAX, "invalid");
}
+static void test_one_clock_gettime64(int clock, const char *name)
+{
+ struct __kernel_timespec start, vdso, end;
+ int vdso_ret, end_ret;
+
+ printf("[RUN]\tTesting clock_gettime64 for clock %s (%d)...\n", name, clock);
+
+ if (sys_clock_gettime64(clock, &start) < 0) {
+ if (errno == EINVAL) {
+ vdso_ret = vdso_clock_gettime64(clock, &vdso);
+ if (vdso_ret == -EINVAL) {
+ printf("[OK]\tNo such clock.\n");
+ } else {
+ printf("[FAIL]\tNo such clock, but __vdso_clock_gettime64 returned %d\n", vdso_ret);
+ nerrs++;
+ }
+ } else {
+ printf("[WARN]\t clock_gettime64(%d) syscall returned error %d\n", clock, errno);
+ }
+ return;
+ }
+
+ vdso_ret = vdso_clock_gettime64(clock, &vdso);
+ end_ret = sys_clock_gettime64(clock, &end);
+
+ if (vdso_ret != 0 || end_ret != 0) {
+ printf("[FAIL]\tvDSO returned %d, syscall errno=%d\n",
+ vdso_ret, errno);
+ nerrs++;
+ return;
+ }
+
+ printf("\t%llu.%09ld %llu.%09ld %llu.%09ld\n",
+ (unsigned long long)start.tv_sec, start.tv_nsec,
+ (unsigned long long)vdso.tv_sec, vdso.tv_nsec,
+ (unsigned long long)end.tv_sec, end.tv_nsec);
+
+ if (!ts64_leq(&start, &vdso) || !ts64_leq(&vdso, &end)) {
+ printf("[FAIL]\tTimes are out of sequence\n");
+ nerrs++;
+ return;
+ }
+
+ printf("[OK]\tTest Passed.\n");
+}
+
+static void test_clock_gettime64(void)
+{
+ if (!vdso_clock_gettime64) {
+ printf("[SKIP]\tNo vDSO, so skipping clock_gettime64() tests\n");
+ return;
+ }
+
+ for (int clock = 0; clock < sizeof(clocknames) / sizeof(clocknames[0]);
+ clock++) {
+ test_one_clock_gettime64(clock, clocknames[clock]);
+ }
+
+ /* Also test some invalid clock ids */
+ test_one_clock_gettime64(-1, "invalid");
+ test_one_clock_gettime64(INT_MIN, "invalid");
+ test_one_clock_gettime64(INT_MAX, "invalid");
+}
+
static void test_gettimeofday(void)
{
struct timeval start, vdso, end;
@@ -327,9 +433,12 @@ static void test_gettimeofday(void)
int main(int argc, char **argv)
{
+ name = (const char **)&names[VDSO_NAMES];
+
fill_function_pointers();
test_clock_gettime();
+ test_clock_gettime64();
test_gettimeofday();
/*
--
2.28.0
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