1 /*
2 * Copyright 2014, Michael Ellerman, IBM Corp.
3 * Licensed under GPLv2.
4 */
5
6 #include <signal.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <stdbool.h>
10 #include <sys/types.h>
11 #include <sys/wait.h>
12 #include <unistd.h>
13
14 #include "ebb.h"
15
16
17 /*
18 * Tests a cpu event vs an EBB - in that order. The EBB should force the cpu
19 * event off the PMU.
20 */
21
setup_cpu_event(struct event * event,int cpu)22 static int setup_cpu_event(struct event *event, int cpu)
23 {
24 event_init_named(event, 0x400FA, "PM_RUN_INST_CMPL");
25
26 event->attr.exclude_kernel = 1;
27 event->attr.exclude_hv = 1;
28 event->attr.exclude_idle = 1;
29
30 SKIP_IF(require_paranoia_below(1));
31 FAIL_IF(event_open_with_cpu(event, cpu));
32 FAIL_IF(event_enable(event));
33
34 return 0;
35 }
36
cpu_event_vs_ebb(void)37 int cpu_event_vs_ebb(void)
38 {
39 union pipe read_pipe, write_pipe;
40 struct event event;
41 int cpu, rc;
42 pid_t pid;
43
44 cpu = pick_online_cpu();
45 FAIL_IF(cpu < 0);
46 FAIL_IF(bind_to_cpu(cpu));
47
48 FAIL_IF(pipe(read_pipe.fds) == -1);
49 FAIL_IF(pipe(write_pipe.fds) == -1);
50
51 pid = fork();
52 if (pid == 0) {
53 /* NB order of pipes looks reversed */
54 exit(ebb_child(write_pipe, read_pipe));
55 }
56
57 /* We setup the cpu event first */
58 rc = setup_cpu_event(&event, cpu);
59 if (rc) {
60 kill_child_and_wait(pid);
61 return rc;
62 }
63
64 /* Signal the child to install its EBB event and wait */
65 if (sync_with_child(read_pipe, write_pipe))
66 /* If it fails, wait for it to exit */
67 goto wait;
68
69 /* Signal the child to run */
70 FAIL_IF(sync_with_child(read_pipe, write_pipe));
71
72 wait:
73 /* We expect the child to succeed */
74 FAIL_IF(wait_for_child(pid));
75
76 FAIL_IF(event_disable(&event));
77 FAIL_IF(event_read(&event));
78
79 event_report(&event);
80
81 /* The cpu event may have run */
82
83 return 0;
84 }
85
main(void)86 int main(void)
87 {
88 return test_harness(cpu_event_vs_ebb, "cpu_event_vs_ebb");
89 }
90