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 --- tools/testing/selftests/vDSO/Makefile | 2 + .../selftests/vDSO/vdso_clock_getres.c | 108 ++++++++++++++++++ 2 files changed, 110 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 9e03d61f52fd..d5c5bfdf1ac1 100644 --- a/tools/testing/selftests/vDSO/Makefile +++ b/tools/testing/selftests/vDSO/Makefile @@ -5,6 +5,7 @@ uname_M := $(shell uname -m 2>/dev/null || echo not) 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 += $(OUTPUT)/vdso_clock_getres ifeq ($(ARCH),x86) TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86 endif @@ -18,6 +19,7 @@ endif
all: $(TEST_GEN_PROGS) $(OUTPUT)/vdso_test: parse_vdso.c vdso_test.c +$(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..b1b9652972eb --- /dev/null +++ b/tools/testing/selftests/vDSO/vdso_clock_getres.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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", +}; + +/* + * Macro to call clock_getres in vdso and by system call + * with different values for clock_id. + */ +#define vdso_test_clock(clock_id) \ +do { \ + 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_sec != y.tv_sec)) { \ + printf(" [FAIL]\n"); \ + return KSFT_SKIP; \ + } else { \ + printf(" [PASS]\n"); \ + } \ +} while (0) + +int main(int argc, char **argv) +{ + +#if _POSIX_TIMERS > 0 + +#ifdef CLOCK_REALTIME + vdso_test_clock(CLOCK_REALTIME); +#endif + +#ifdef CLOCK_BOOTTIME + vdso_test_clock(CLOCK_BOOTTIME); +#endif + +#ifdef CLOCK_TAI + vdso_test_clock(CLOCK_TAI); +#endif + +#ifdef CLOCK_REALTIME_COARSE + vdso_test_clock(CLOCK_REALTIME_COARSE); +#endif + +#ifdef CLOCK_MONOTONIC + vdso_test_clock(CLOCK_MONOTONIC); +#endif + +#ifdef CLOCK_MONOTONIC_RAW + vdso_test_clock(CLOCK_MONOTONIC_RAW); +#endif + +#ifdef CLOCK_MONOTONIC_COARSE + vdso_test_clock(CLOCK_MONOTONIC_COARSE); +#endif + +#endif + + return 0; +}