The current version of the multiarch vDSO selftest verifies only gettimeofday.
Extend the vDSO selftest to the other library functions: - time - clock_getres - clock_gettime
The extension has been used to verify the unified vdso library on the supported architectures.
Cc: Shuah Khan shuah@kernel.org Signed-off-by: Vincenzo Frascino vincenzo.frascino@arm.com --- tools/testing/selftests/vDSO/Makefile | 2 + tools/testing/selftests/vDSO/vdso_full_test.c | 261 ++++++++++++++++++ 2 files changed, 263 insertions(+) create mode 100644 tools/testing/selftests/vDSO/vdso_full_test.c
diff --git a/tools/testing/selftests/vDSO/Makefile b/tools/testing/selftests/vDSO/Makefile index 9e03d61f52fd..68e9b4a1cdcf 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 += $(OUTPUT)/vdso_full_test ifeq ($(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_full_test: parse_vdso.c vdso_full_test.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_full_test.c b/tools/testing/selftests/vDSO/vdso_full_test.c new file mode 100644 index 000000000000..62001d3d241b --- /dev/null +++ b/tools/testing/selftests/vDSO/vdso_full_test.c @@ -0,0 +1,261 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * vdso_full_test.c: Sample code to test all the timers. + * Copyright (c) 2019 Arm Ltd. + * + * Compile with: + * gcc -std=gnu99 vdso_full_test.c parse_vdso.c + * + * Tested on ARM, ARM64, MIPS32 and x86 (32-bit and 64-bit). + * Might work on other architectures. + */ + +#include <stdint.h> +#include <elf.h> +#include <stdio.h> +#include <time.h> +#include <sys/auxv.h> +#include <sys/time.h> +#define _GNU_SOURCE +#include <unistd.h> +#include <sys/syscall.h> + +#include "../kselftest.h" + +extern void *vdso_sym(const char *version, const char *name); +extern void vdso_init_from_sysinfo_ehdr(uintptr_t base); +extern void vdso_init_from_auxv(void *auxv); + +/* + * ARM64's vDSO exports its vDSO implementation with different names and + * a different version from other architectures, so we need to handle it + * as a special case. + */ +#if defined(__aarch64__) +const char *version = "LINUX_2.6.39"; +const char *name[4] = { + "__kernel_gettimeofday", + "__kernel_clock_gettime", + "__kernel_time", + "__kernel_clock_getres", +}; +#else +/* Tested on x86, arm, mips */ +const char *version = "LINUX_2.6"; +const char *name[4] = { + "__vdso_gettimeofday", + "__vdso_clock_gettime", + "__vdso_time", + "__vdso_clock_getres", +}; +#endif + +typedef long (*vdso_gettimeofday_t)(struct timeval *tv, struct timezone *tz); +typedef long (*vdso_clock_gettime_t)(clockid_t clk_id, struct timespec *ts); +typedef long (*vdso_clock_getres_t)(clockid_t clk_id, struct timespec *ts); +typedef time_t (*vdso_time_t)(time_t *t); + +static int vdso_test_gettimeofday(void) +{ + /* Find gettimeofday. */ + vdso_gettimeofday_t vdso_gettimeofday = + (vdso_gettimeofday_t)vdso_sym(version, name[0]); + + if (!vdso_gettimeofday) { + printf("Could not find %s\n", name[0]); + return KSFT_SKIP; + } + + struct timeval tv; + long ret = vdso_gettimeofday(&tv, 0); + + if (ret == 0) { + printf("The time is %lld.%06lld\n", + (long long)tv.tv_sec, (long long)tv.tv_usec); + } else { + printf("%s failed\n", name[0]); + return KSFT_FAIL; + } + + return KSFT_PASS; +} + +static int vdso_test_clock_gettime(clockid_t clk_id) +{ + /* Find clock_gettime. */ + vdso_clock_gettime_t vdso_clock_gettime = + (vdso_clock_gettime_t)vdso_sym(version, name[1]); + + if (!vdso_clock_gettime) { + printf("Could not find %s\n", name[1]); + return KSFT_SKIP; + } + + struct timespec ts; + long ret = vdso_clock_gettime(clk_id, &ts); + + if (ret == 0) { + printf("The time is %lld.%06lld\n", + (long long)ts.tv_sec, (long long)ts.tv_nsec); + } else { + printf("%s failed\n", name[1]); + return KSFT_FAIL; + } + + return KSFT_PASS; +} + +static int vdso_test_time(void) +{ + /* Find time. */ + vdso_time_t vdso_time = + (vdso_time_t)vdso_sym(version, name[2]); + + if (!vdso_time) { + printf("Could not find %s\n", name[2]); + return KSFT_SKIP; + } + + long ret = vdso_time(NULL); + + if (ret > 0) { + printf("The time in hours since January 1, 1970 is %lld\n", + (long long)(ret / 3600)); + } else { + printf("%s failed\n", name[2]); + return KSFT_FAIL; + } + + return KSFT_PASS; +} + +static int vdso_test_clock_getres(clockid_t clk_id) +{ + /* Find clock_getres. */ + vdso_clock_getres_t vdso_clock_getres = + (vdso_clock_getres_t)vdso_sym(version, name[3]); + + if (!vdso_clock_getres) { + printf("Could not find %s\n", name[3]); + return KSFT_SKIP; + } + + struct timespec ts, sys_ts; + long ret = vdso_clock_getres(clk_id, &ts); + + if (ret == 0) { + printf("The resolution is %lld %lld\n", + (long long)ts.tv_sec, (long long)ts.tv_nsec); + } else { + printf("%s failed\n", name[3]); + return KSFT_FAIL; + } + + ret = syscall(SYS_clock_getres, clk_id, &sys_ts); + + if ((sys_ts.tv_sec != ts.tv_sec) || (sys_ts.tv_nsec != ts.tv_nsec)) { + printf("%s failed\n", name[3]); + return KSFT_FAIL; + } + + return KSFT_PASS; +} + +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 vdso_test_clock_gettime and vdso_test_clock_getres + * with different values for clock_id. + */ +static inline int vdso_test_clock(clockid_t clock_id) +{ + int ret0, ret1; + + ret0 = vdso_test_clock_gettime(clock_id); + /* A skipped test is considered passed */ + if (ret0 == KSFT_SKIP) + ret0 = KSFT_PASS; + + ret1 = vdso_test_clock_getres(clock_id); + /* A skipped test is considered passed */ + if (ret1 == KSFT_SKIP) + ret1 = KSFT_PASS; + + ret0 += ret1; + + printf("clock_id: %s", vdso_clock_name[clock_id]); + + if (ret0 > 0) + printf(" [FAIL]\n"); + else + printf(" [PASS]\n"); + + return ret0; +} + +int main(int argc, char **argv) +{ + unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR); + int ret; + + if (!sysinfo_ehdr) { + printf("AT_SYSINFO_EHDR is not present!\n"); + return KSFT_SKIP; + } + + vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR)); + + ret = vdso_test_gettimeofday(); + +#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 + + ret += vdso_test_time(); + + if (ret > 0) + return KSFT_FAIL; + + return KSFT_PASS; +}