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15#define _GNU_SOURCE
16
17#include <errno.h>
18#include <fcntl.h>
19#include <sched.h>
20#include <signal.h>
21#include <stdbool.h>
22#include <stdio.h>
23#include <string.h>
24#include <unistd.h>
25#include <sys/ptrace.h>
26#include <sys/stat.h>
27#include <sys/timerfd.h>
28#include <sys/types.h>
29#include <sys/wait.h>
30
31#include "../kselftest.h"
32
33void child(int cpu)
34{
35 cpu_set_t set;
36
37 CPU_ZERO(&set);
38 CPU_SET(cpu, &set);
39 if (sched_setaffinity(0, sizeof(set), &set) != 0) {
40 ksft_print_msg("sched_setaffinity() failed: %s\n",
41 strerror(errno));
42 _exit(1);
43 }
44
45 if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != 0) {
46 ksft_print_msg("ptrace(PTRACE_TRACEME) failed: %s\n",
47 strerror(errno));
48 _exit(1);
49 }
50
51 if (raise(SIGSTOP) != 0) {
52 ksft_print_msg("raise(SIGSTOP) failed: %s\n", strerror(errno));
53 _exit(1);
54 }
55
56 _exit(0);
57}
58
59bool run_test(int cpu)
60{
61 int status;
62 pid_t pid = fork();
63 pid_t wpid;
64
65 if (pid < 0) {
66 ksft_print_msg("fork() failed: %s\n", strerror(errno));
67 return false;
68 }
69 if (pid == 0)
70 child(cpu);
71
72 wpid = waitpid(pid, &status, __WALL);
73 if (wpid != pid) {
74 ksft_print_msg("waitpid() failed: %s\n", strerror(errno));
75 return false;
76 }
77 if (!WIFSTOPPED(status)) {
78 ksft_print_msg("child did not stop: %s\n", strerror(errno));
79 return false;
80 }
81 if (WSTOPSIG(status) != SIGSTOP) {
82 ksft_print_msg("child did not stop with SIGSTOP: %s\n",
83 strerror(errno));
84 return false;
85 }
86
87 if (ptrace(PTRACE_SINGLESTEP, pid, NULL, NULL) < 0) {
88 if (errno == EIO) {
89 ksft_exit_skip(
90 "ptrace(PTRACE_SINGLESTEP) not supported on this architecture: %s\n",
91 strerror(errno));
92 }
93 ksft_print_msg("ptrace(PTRACE_SINGLESTEP) failed: %s\n",
94 strerror(errno));
95 return false;
96 }
97
98 wpid = waitpid(pid, &status, __WALL);
99 if (wpid != pid) {
100 ksft_print_msg("waitpid() failed: $s\n", strerror(errno));
101 return false;
102 }
103 if (WIFEXITED(status)) {
104 ksft_print_msg("child did not single-step: %s\n",
105 strerror(errno));
106 return false;
107 }
108 if (!WIFSTOPPED(status)) {
109 ksft_print_msg("child did not stop: %s\n", strerror(errno));
110 return false;
111 }
112 if (WSTOPSIG(status) != SIGTRAP) {
113 ksft_print_msg("child did not stop with SIGTRAP: %s\n",
114 strerror(errno));
115 return false;
116 }
117
118 if (ptrace(PTRACE_CONT, pid, NULL, NULL) < 0) {
119 ksft_print_msg("ptrace(PTRACE_CONT) failed: %s\n",
120 strerror(errno));
121 return false;
122 }
123
124 wpid = waitpid(pid, &status, __WALL);
125 if (wpid != pid) {
126 ksft_print_msg("waitpid() failed: %s\n", strerror(errno));
127 return false;
128 }
129 if (!WIFEXITED(status)) {
130 ksft_print_msg("child did not exit after PTRACE_CONT: %s\n",
131 strerror(errno));
132 return false;
133 }
134
135 return true;
136}
137
138void suspend(void)
139{
140 int power_state_fd;
141 struct sigevent event = {};
142 int timerfd;
143 int err;
144 struct itimerspec spec = {};
145
146 power_state_fd = open("/sys/power/state", O_RDWR);
147 if (power_state_fd < 0)
148 ksft_exit_fail_msg(
149 "open(\"/sys/power/state\") failed (is this test running as root?)\n");
150
151 timerfd = timerfd_create(CLOCK_BOOTTIME_ALARM, 0);
152 if (timerfd < 0)
153 ksft_exit_fail_msg("timerfd_create() failed\n");
154
155 spec.it_value.tv_sec = 5;
156 err = timerfd_settime(timerfd, 0, &spec, NULL);
157 if (err < 0)
158 ksft_exit_fail_msg("timerfd_settime() failed\n");
159
160 if (write(power_state_fd, "mem", strlen("mem")) != strlen("mem"))
161 ksft_exit_fail_msg("Failed to enter Suspend state\n");
162
163 close(timerfd);
164 close(power_state_fd);
165}
166
167int main(int argc, char **argv)
168{
169 int opt;
170 bool do_suspend = true;
171 bool succeeded = true;
172 cpu_set_t available_cpus;
173 int err;
174 int cpu;
175
176 ksft_print_header();
177
178 while ((opt = getopt(argc, argv, "n")) != -1) {
179 switch (opt) {
180 case 'n':
181 do_suspend = false;
182 break;
183 default:
184 printf("Usage: %s [-n]\n", argv[0]);
185 printf(" -n: do not trigger a suspend/resume cycle before the test\n");
186 return -1;
187 }
188 }
189
190 if (do_suspend)
191 suspend();
192
193 err = sched_getaffinity(0, sizeof(available_cpus), &available_cpus);
194 if (err < 0)
195 ksft_exit_fail_msg("sched_getaffinity() failed\n");
196
197 for (cpu = 0; cpu < CPU_SETSIZE; cpu++) {
198 bool test_success;
199
200 if (!CPU_ISSET(cpu, &available_cpus))
201 continue;
202
203 test_success = run_test(cpu);
204 if (test_success) {
205 ksft_test_result_pass("CPU %d\n", cpu);
206 } else {
207 ksft_test_result_fail("CPU %d\n", cpu);
208 succeeded = false;
209 }
210 }
211
212 if (succeeded)
213 ksft_exit_pass();
214 else
215 ksft_exit_fail();
216}
217
