From patchwork Wed May 6 14:17:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincenzo Frascino X-Patchwork-Id: 11531279 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C9E09913 for ; Wed, 6 May 2020 14:18:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB524206D5 for ; Wed, 6 May 2020 14:18:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728991AbgEFOSG (ORCPT ); Wed, 6 May 2020 10:18:06 -0400 Received: from foss.arm.com ([217.140.110.172]:37510 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728958AbgEFOSG (ORCPT ); Wed, 6 May 2020 10:18:06 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5EFFF1045; Wed, 6 May 2020 07:18:05 -0700 (PDT) Received: from e119884-lin.cambridge.arm.com (e119884-lin.cambridge.arm.com [10.1.196.72]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 605D73F68F; Wed, 6 May 2020 07:18:04 -0700 (PDT) From: Vincenzo Frascino To: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Vincenzo Frascino , Shuah Khan , Thomas Gleixner , Andy Lutomirski , Arnd Bergmann Subject: [PATCH v3 3/5] kselftest: Extend vDSO selftest to clock_getres Date: Wed, 6 May 2020 15:17:29 +0100 Message-Id: <20200506141731.14660-4-vincenzo.frascino@arm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200506141731.14660-1-vincenzo.frascino@arm.com> References: <20200506141731.14660-1-vincenzo.frascino@arm.com> MIME-Version: 1.0 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org 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 Signed-off-by: Vincenzo Frascino --- tools/testing/selftests/vDSO/Makefile | 2 + .../selftests/vDSO/vdso_clock_getres.c | 124 ++++++++++++++++++ 2 files changed, 126 insertions(+) create mode 100644 tools/testing/selftests/vDSO/vdso_clock_getres.c diff --git a/tools/testing/selftests/vDSO/Makefile b/tools/testing/selftests/vDSO/Makefile index 46aab4eaccbd..7b096eedfd5d 100644 --- a/tools/testing/selftests/vDSO/Makefile +++ b/tools/testing/selftests/vDSO/Makefile @@ -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 TEST_GEN_PROGS += $(OUTPUT)/vdso_full_test +TEST_GEN_PROGS += $(OUTPUT)/vdso_clock_getres ifeq ($(ARCH),x86) TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86 endif @@ -19,6 +20,7 @@ endif all: $(TEST_GEN_PROGS) $(OUTPUT)/vdso_test: parse_vdso.c vdso_test.c $(OUTPUT)/vdso_full_test: parse_vdso.c vdso_full_test.c +$(OUTPUT)/vdso_clock_getres: vdso_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 \ diff --git a/tools/testing/selftests/vDSO/vdso_clock_getres.c b/tools/testing/selftests/vDSO/vdso_clock_getres.c new file mode 100644 index 000000000000..15dcee16ff72 --- /dev/null +++ b/tools/testing/selftests/vDSO/vdso_clock_getres.c @@ -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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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; +}