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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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selftests: breakpoint: add step_after_suspend_test
Commit e56d82a116
("arm64: cpu hotplug: ensure we mask out
CPU_TASKS_FROZEN in notifiers") fixed a long-standing ARM64 bug that
broke single-stepping after a suspend/resume cycle. Add a kernel
selftest to make sure this doesn't regress or affect other platforms.
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
This commit is contained in:
parent
9d22f6e14e
commit
bfd092b8c2
@ -6,9 +6,11 @@ ifeq ($(ARCH),x86)
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TEST_PROGS := breakpoint_test
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endif
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TEST_PROGS += step_after_suspend_test
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all: $(TEST_PROGS)
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include ../lib.mk
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clean:
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rm -fr breakpoint_test
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rm -fr breakpoint_test step_after_suspend_test
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218
tools/testing/selftests/breakpoints/step_after_suspend_test.c
Normal file
218
tools/testing/selftests/breakpoints/step_after_suspend_test.c
Normal file
@ -0,0 +1,218 @@
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/*
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* Copyright (C) 2016 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ptrace.h>
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#include <sys/stat.h>
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#include <sys/timerfd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "../kselftest.h"
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void child(int cpu)
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{
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cpu_set_t set;
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CPU_ZERO(&set);
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CPU_SET(cpu, &set);
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if (sched_setaffinity(0, sizeof(set), &set) != 0) {
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perror("sched_setaffinity() failed");
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_exit(1);
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}
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if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != 0) {
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perror("ptrace(PTRACE_TRACEME) failed");
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_exit(1);
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}
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if (raise(SIGSTOP) != 0) {
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perror("raise(SIGSTOP) failed");
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_exit(1);
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}
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_exit(0);
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}
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bool run_test(int cpu)
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{
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int status;
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pid_t pid = fork();
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pid_t wpid;
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if (pid < 0) {
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perror("fork() failed");
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return false;
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}
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if (pid == 0)
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child(cpu);
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wpid = waitpid(pid, &status, __WALL);
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if (wpid != pid) {
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perror("waitpid() failed");
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return false;
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}
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if (!WIFSTOPPED(status)) {
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printf("child did not stop\n");
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return false;
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}
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if (WSTOPSIG(status) != SIGSTOP) {
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printf("child did not stop with SIGSTOP\n");
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return false;
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}
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if (ptrace(PTRACE_SINGLESTEP, pid, NULL, NULL) < 0) {
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if (errno == EIO) {
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printf("ptrace(PTRACE_SINGLESTEP) not supported on this architecture\n");
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ksft_exit_skip();
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}
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perror("ptrace(PTRACE_SINGLESTEP) failed");
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return false;
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}
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wpid = waitpid(pid, &status, __WALL);
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if (wpid != pid) {
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perror("waitpid() failed");
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return false;
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}
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if (WIFEXITED(status)) {
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printf("child did not single-step\n");
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return false;
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}
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if (!WIFSTOPPED(status)) {
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printf("child did not stop\n");
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return false;
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}
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if (WSTOPSIG(status) != SIGTRAP) {
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printf("child did not stop with SIGTRAP\n");
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return false;
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}
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if (ptrace(PTRACE_CONT, pid, NULL, NULL) < 0) {
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perror("ptrace(PTRACE_CONT) failed");
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return false;
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}
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wpid = waitpid(pid, &status, __WALL);
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if (wpid != pid) {
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perror("waitpid() failed");
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return false;
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}
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if (!WIFEXITED(status)) {
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printf("child did not exit after PTRACE_CONT\n");
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return false;
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}
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return true;
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}
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void suspend(void)
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{
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int power_state_fd;
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struct sigevent event = {};
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int timerfd;
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int err;
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struct itimerspec spec = {};
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power_state_fd = open("/sys/power/state", O_RDWR);
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if (power_state_fd < 0) {
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perror("open(\"/sys/power/state\") failed (is this test running as root?)");
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ksft_exit_fail();
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}
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timerfd = timerfd_create(CLOCK_BOOTTIME_ALARM, 0);
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if (timerfd < 0) {
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perror("timerfd_create() failed");
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ksft_exit_fail();
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}
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spec.it_value.tv_sec = 5;
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err = timerfd_settime(timerfd, 0, &spec, NULL);
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if (err < 0) {
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perror("timerfd_settime() failed");
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ksft_exit_fail();
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}
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if (write(power_state_fd, "mem", strlen("mem")) != strlen("mem")) {
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perror("entering suspend failed");
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ksft_exit_fail();
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}
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close(timerfd);
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close(power_state_fd);
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}
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int main(int argc, char **argv)
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{
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int opt;
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bool do_suspend = true;
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bool succeeded = true;
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cpu_set_t available_cpus;
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int err;
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int cpu;
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while ((opt = getopt(argc, argv, "n")) != -1) {
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switch (opt) {
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case 'n':
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do_suspend = false;
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break;
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default:
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printf("Usage: %s [-n]\n", argv[0]);
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printf(" -n: do not trigger a suspend/resume cycle before the test\n");
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return -1;
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}
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}
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if (do_suspend)
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suspend();
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err = sched_getaffinity(0, sizeof(available_cpus), &available_cpus);
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if (err < 0) {
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perror("sched_getaffinity() failed");
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ksft_exit_fail();
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}
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for (cpu = 0; cpu < CPU_SETSIZE; cpu++) {
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bool test_success;
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if (!CPU_ISSET(cpu, &available_cpus))
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continue;
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test_success = run_test(cpu);
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printf("CPU %d: ", cpu);
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if (test_success) {
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printf("[OK]\n");
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ksft_inc_pass_cnt();
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} else {
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printf("[FAILED]\n");
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ksft_inc_fail_cnt();
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succeeded = false;
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}
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}
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ksft_print_cnts();
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if (succeeded)
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ksft_exit_pass();
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else
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ksft_exit_fail();
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}
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