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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2016 Google, Inc.
*/
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/ptrace.h>
#include <sys/stat.h>
#include <sys/timerfd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "../kselftest.h"
void child(int cpu)
{
cpu_set_t set;
CPU_ZERO(&set);
CPU_SET(cpu, &set);
if (sched_setaffinity(0, sizeof(set), &set) != 0) {
ksft_print_msg("sched_setaffinity() failed: %s\n",
strerror(errno));
_exit(1);
}
if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != 0) {
ksft_print_msg("ptrace(PTRACE_TRACEME) failed: %s\n",
strerror(errno));
_exit(1);
}
if (raise(SIGSTOP) != 0) {
ksft_print_msg("raise(SIGSTOP) failed: %s\n", strerror(errno));
_exit(1);
}
_exit(0);
}
int run_test(int cpu)
{
int status;
pid_t pid = fork();
pid_t wpid;
if (pid < 0) {
ksft_print_msg("fork() failed: %s\n", strerror(errno));
return KSFT_FAIL;
}
if (pid == 0)
child(cpu);
wpid = waitpid(pid, &status, __WALL);
if (wpid != pid) {
ksft_print_msg("waitpid() failed: %s\n", strerror(errno));
return KSFT_FAIL;
}
if (!WIFSTOPPED(status)) {
ksft_print_msg("child did not stop: %s\n", strerror(errno));
return KSFT_FAIL;
}
if (WSTOPSIG(status) != SIGSTOP) {
ksft_print_msg("child did not stop with SIGSTOP: %s\n",
strerror(errno));
return KSFT_FAIL;
}
if (ptrace(PTRACE_SINGLESTEP, pid, NULL, NULL) < 0) {
if (errno == EIO) {
ksft_print_msg(
"ptrace(PTRACE_SINGLESTEP) not supported on this architecture: %s\n",
strerror(errno));
return KSFT_SKIP;
}
ksft_print_msg("ptrace(PTRACE_SINGLESTEP) failed: %s\n",
strerror(errno));
return KSFT_FAIL;
}
wpid = waitpid(pid, &status, __WALL);
if (wpid != pid) {
ksft_print_msg("waitpid() failed: %s\n", strerror(errno));
return KSFT_FAIL;
}
if (WIFEXITED(status)) {
ksft_print_msg("child did not single-step: %s\n",
strerror(errno));
return KSFT_FAIL;
}
if (!WIFSTOPPED(status)) {
ksft_print_msg("child did not stop: %s\n", strerror(errno));
return KSFT_FAIL;
}
if (WSTOPSIG(status) != SIGTRAP) {
ksft_print_msg("child did not stop with SIGTRAP: %s\n",
strerror(errno));
return KSFT_FAIL;
}
if (ptrace(PTRACE_CONT, pid, NULL, NULL) < 0) {
ksft_print_msg("ptrace(PTRACE_CONT) failed: %s\n",
strerror(errno));
return KSFT_FAIL;
}
wpid = waitpid(pid, &status, __WALL);
if (wpid != pid) {
ksft_print_msg("waitpid() failed: %s\n", strerror(errno));
return KSFT_FAIL;
}
if (!WIFEXITED(status)) {
ksft_print_msg("child did not exit after PTRACE_CONT: %s\n",
strerror(errno));
return KSFT_FAIL;
}
return KSFT_PASS;
}
void suspend(void)
{
int power_state_fd;
struct sigevent event = {};
int timerfd;
int err;
struct itimerspec spec = {};
if (getuid() != 0)
ksft_exit_skip("Please run the test as root - Exiting.\n");
power_state_fd = open("/sys/power/state", O_RDWR);
if (power_state_fd < 0)
ksft_exit_fail_msg(
"open(\"/sys/power/state\") failed %s)\n",
strerror(errno));
timerfd = timerfd_create(CLOCK_BOOTTIME_ALARM, 0);
if (timerfd < 0)
ksft_exit_fail_msg("timerfd_create() failed\n");
spec.it_value.tv_sec = 5;
err = timerfd_settime(timerfd, 0, &spec, NULL);
if (err < 0)
ksft_exit_fail_msg("timerfd_settime() failed\n");
if (write(power_state_fd, "mem", strlen("mem")) != strlen("mem"))
ksft_exit_fail_msg("Failed to enter Suspend state\n");
close(timerfd);
close(power_state_fd);
}
int main(int argc, char **argv)
{
int opt;
bool do_suspend = true;
bool succeeded = true;
unsigned int tests = 0;
cpu_set_t available_cpus;
int err;
int cpu;
ksft_print_header();
while ((opt = getopt(argc, argv, "n")) != -1) {
switch (opt) {
case 'n':
do_suspend = false;
break;
default:
printf("Usage: %s [-n]\n", argv[0]);
printf(" -n: do not trigger a suspend/resume cycle before the test\n");
return -1;
}
}
err = sched_getaffinity(0, sizeof(available_cpus), &available_cpus);
if (err < 0)
ksft_exit_fail_msg("sched_getaffinity() failed\n");
for (cpu = 0; cpu < CPU_SETSIZE; cpu++) {
if (!CPU_ISSET(cpu, &available_cpus))
continue;
tests++;
}
if (do_suspend)
suspend();
ksft_set_plan(tests);
for (cpu = 0; cpu < CPU_SETSIZE; cpu++) {
int test_success;
if (!CPU_ISSET(cpu, &available_cpus))
continue;
test_success = run_test(cpu);
switch (test_success) {
case KSFT_PASS:
ksft_test_result_pass("CPU %d\n", cpu);
break;
case KSFT_SKIP:
ksft_test_result_skip("CPU %d\n", cpu);
break;
case KSFT_FAIL:
ksft_test_result_fail("CPU %d\n", cpu);
succeeded = false;
break;
}
}
if (succeeded)
ksft_exit_pass();
else
ksft_exit_fail();
}
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