tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
kselftest: Extend vDSO selftest to clock_getres
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>
authored by
Vincenzo Frascino
and committed by
Shuah Khan
03f55c79
693f5ca0
+126
+2
tools/testing/selftests/vDSO/Makefile
+2
tools/testing/selftests/vDSO/Makefile
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TEST_GEN_PROGS := $(OUTPUT)/vdso_test_gettimeofday $(OUTPUT)/vdso_test_getcpu
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TEST_GEN_PROGS += $(OUTPUT)/vdso_test_abi
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TEST_GEN_PROGS += $(OUTPUT)/vdso_test_clock_getres
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ifeq ($(ARCH),x86)
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TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86
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endif
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$(OUTPUT)/vdso_test_gettimeofday: parse_vdso.c vdso_test_gettimeofday.c
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$(OUTPUT)/vdso_test_getcpu: parse_vdso.c vdso_test_getcpu.c
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$(OUTPUT)/vdso_test_abi: parse_vdso.c vdso_test_abi.c
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$(OUTPUT)/vdso_test_clock_getres: vdso_test_clock_getres.c
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$(OUTPUT)/vdso_standalone_test_x86: vdso_standalone_test_x86.c parse_vdso.c
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$(CC) $(CFLAGS) $(CFLAGS_vdso_standalone_test_x86) \
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vdso_standalone_test_x86.c parse_vdso.c \
+124
tools/testing/selftests/vDSO/vdso_test_clock_getres.c
+124
tools/testing/selftests/vDSO/vdso_test_clock_getres.c
···
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// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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/*
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* vdso_clock_getres.c: Sample code to test clock_getres.
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* Copyright (c) 2019 Arm Ltd.
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*
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* Compile with:
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* gcc -std=gnu99 vdso_clock_getres.c
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*
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* Tested on ARM, ARM64, MIPS32, x86 (32-bit and 64-bit),
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* Power (32-bit and 64-bit), S390x (32-bit and 64-bit).
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* Might work on other architectures.
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*/
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#define _GNU_SOURCE
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#include <elf.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <sys/auxv.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include "../kselftest.h"
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static long syscall_clock_getres(clockid_t _clkid, struct timespec *_ts)
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{
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long ret;
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ret = syscall(SYS_clock_getres, _clkid, _ts);
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return ret;
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}
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const char *vdso_clock_name[12] = {
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"CLOCK_REALTIME",
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"CLOCK_MONOTONIC",
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"CLOCK_PROCESS_CPUTIME_ID",
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"CLOCK_THREAD_CPUTIME_ID",
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"CLOCK_MONOTONIC_RAW",
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"CLOCK_REALTIME_COARSE",
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"CLOCK_MONOTONIC_COARSE",
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"CLOCK_BOOTTIME",
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"CLOCK_REALTIME_ALARM",
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"CLOCK_BOOTTIME_ALARM",
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"CLOCK_SGI_CYCLE",
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"CLOCK_TAI",
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};
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/*
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* This function calls clock_getres in vdso and by system call
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* with different values for clock_id.
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*
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* Example of output:
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*
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* clock_id: CLOCK_REALTIME [PASS]
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* clock_id: CLOCK_BOOTTIME [PASS]
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* clock_id: CLOCK_TAI [PASS]
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* clock_id: CLOCK_REALTIME_COARSE [PASS]
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* clock_id: CLOCK_MONOTONIC [PASS]
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* clock_id: CLOCK_MONOTONIC_RAW [PASS]
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* clock_id: CLOCK_MONOTONIC_COARSE [PASS]
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*/
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static inline int vdso_test_clock(unsigned int clock_id)
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{
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struct timespec x, y;
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printf("clock_id: %s", vdso_clock_name[clock_id]);
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clock_getres(clock_id, &x);
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syscall_clock_getres(clock_id, &y);
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if ((x.tv_sec != y.tv_sec) || (x.tv_nsec != y.tv_nsec)) {
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printf(" [FAIL]\n");
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return KSFT_FAIL;
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}
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printf(" [PASS]\n");
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return KSFT_PASS;
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}
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int main(int argc, char **argv)
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{
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int ret;
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#if _POSIX_TIMERS > 0
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#ifdef CLOCK_REALTIME
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ret = vdso_test_clock(CLOCK_REALTIME);
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#endif
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#ifdef CLOCK_BOOTTIME
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ret += vdso_test_clock(CLOCK_BOOTTIME);
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#endif
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#ifdef CLOCK_TAI
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ret += vdso_test_clock(CLOCK_TAI);
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#endif
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#ifdef CLOCK_REALTIME_COARSE
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ret += vdso_test_clock(CLOCK_REALTIME_COARSE);
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#endif
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#ifdef CLOCK_MONOTONIC
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ret += vdso_test_clock(CLOCK_MONOTONIC);
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#endif
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#ifdef CLOCK_MONOTONIC_RAW
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ret += vdso_test_clock(CLOCK_MONOTONIC_RAW);
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#endif
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#ifdef CLOCK_MONOTONIC_COARSE
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ret += vdso_test_clock(CLOCK_MONOTONIC_COARSE);
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#endif
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#endif
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if (ret > 0)
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return KSFT_FAIL;
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return KSFT_PASS;
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}