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kselftest: Extend vDSO selftest to clock_getres

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The current version of the multiarch vDSO selftest verifies only
gettimeofday.

Extend the vDSO selftest to clock_getres, to verify that the
syscall and the vDSO library function return the same information.

The extension has been used to verify the hrtimer_resoltion fix.

Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Vincenzo Frascino 2020-10-26 11:49:43 +00:00 committed by Shuah Khan
parent 693f5ca08c
commit 03f55c7952
2 changed files with 126 additions and 0 deletions
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2
tools/testing/selftests/vDSO/Makefile
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@ -6,6 +6,7 @@ ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
TEST_GEN_PROGS := $(OUTPUT)/vdso_test_gettimeofday $(OUTPUT)/vdso_test_getcpu
TEST_GEN_PROGS += $(OUTPUT)/vdso_test_abi
TEST_GEN_PROGS += $(OUTPUT)/vdso_test_clock_getres
ifeq ($(ARCH),x86)
TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86
endif
@ -20,6 +21,7 @@ all: $(TEST_GEN_PROGS)
$(OUTPUT)/vdso_test_gettimeofday: parse_vdso.c vdso_test_gettimeofday.c
$(OUTPUT)/vdso_test_getcpu: parse_vdso.c vdso_test_getcpu.c
$(OUTPUT)/vdso_test_abi: parse_vdso.c vdso_test_abi.c
$(OUTPUT)/vdso_test_clock_getres: vdso_test_clock_getres.c
$(OUTPUT)/vdso_standalone_test_x86: vdso_standalone_test_x86.c parse_vdso.c
$(CC) $(CFLAGS) $(CFLAGS_vdso_standalone_test_x86) \
vdso_standalone_test_x86.c parse_vdso.c \

124
tools/testing/selftests/vDSO/vdso_test_clock_getres.c Normal file
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@ -0,0 +1,124 @@
// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
/*
* vdso_clock_getres.c: Sample code to test clock_getres.
* Copyright (c) 2019 Arm Ltd.
*
* Compile with:
* gcc -std=gnu99 vdso_clock_getres.c
*
* Tested on ARM, ARM64, MIPS32, x86 (32-bit and 64-bit),
* Power (32-bit and 64-bit), S390x (32-bit and 64-bit).
* Might work on other architectures.
*/
#define _GNU_SOURCE
#include <elf.h>
#include <err.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/auxv.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <unistd.h>
#include <sys/syscall.h>
#include "../kselftest.h"
static long syscall_clock_getres(clockid_t _clkid, struct timespec *_ts)
{
long ret;
ret = syscall(SYS_clock_getres, _clkid, _ts);
return ret;
}
const char *vdso_clock_name[12] = {
"CLOCK_REALTIME",
"CLOCK_MONOTONIC",
"CLOCK_PROCESS_CPUTIME_ID",
"CLOCK_THREAD_CPUTIME_ID",
"CLOCK_MONOTONIC_RAW",
"CLOCK_REALTIME_COARSE",
"CLOCK_MONOTONIC_COARSE",
"CLOCK_BOOTTIME",
"CLOCK_REALTIME_ALARM",
"CLOCK_BOOTTIME_ALARM",
"CLOCK_SGI_CYCLE",
"CLOCK_TAI",
};
/*
* This function calls clock_getres in vdso and by system call
* with different values for clock_id.
*
* Example of output:
*
* clock_id: CLOCK_REALTIME [PASS]
* clock_id: CLOCK_BOOTTIME [PASS]
* clock_id: CLOCK_TAI [PASS]
* clock_id: CLOCK_REALTIME_COARSE [PASS]
* clock_id: CLOCK_MONOTONIC [PASS]
* clock_id: CLOCK_MONOTONIC_RAW [PASS]
* clock_id: CLOCK_MONOTONIC_COARSE [PASS]
*/
static inline int vdso_test_clock(unsigned int clock_id)
{
struct timespec x, y;
printf("clock_id: %s", vdso_clock_name[clock_id]);
clock_getres(clock_id, &x);
syscall_clock_getres(clock_id, &y);
if ((x.tv_sec != y.tv_sec) || (x.tv_nsec != y.tv_nsec)) {
printf(" [FAIL]\n");
return KSFT_FAIL;
}
printf(" [PASS]\n");
return KSFT_PASS;
}
int main(int argc, char **argv)
{
int ret;
#if _POSIX_TIMERS > 0
#ifdef CLOCK_REALTIME
ret = vdso_test_clock(CLOCK_REALTIME);
#endif
#ifdef CLOCK_BOOTTIME
ret += vdso_test_clock(CLOCK_BOOTTIME);
#endif
#ifdef CLOCK_TAI
ret += vdso_test_clock(CLOCK_TAI);
#endif
#ifdef CLOCK_REALTIME_COARSE
ret += vdso_test_clock(CLOCK_REALTIME_COARSE);
#endif
#ifdef CLOCK_MONOTONIC
ret += vdso_test_clock(CLOCK_MONOTONIC);
#endif
#ifdef CLOCK_MONOTONIC_RAW
ret += vdso_test_clock(CLOCK_MONOTONIC_RAW);
#endif
#ifdef CLOCK_MONOTONIC_COARSE
ret += vdso_test_clock(CLOCK_MONOTONIC_COARSE);
#endif
#endif
if (ret > 0)
return KSFT_FAIL;
return KSFT_PASS;
}