1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2014, Michael Ellerman, IBM Corp.
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 pinned cpu event vs an EBB - in that order. The pinned cpu event
19 * should remain and the EBB event should fail to enable.
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.pinned = 1;
27
28 event->attr.exclude_kernel = 1;
29 event->attr.exclude_hv = 1;
30 event->attr.exclude_idle = 1;
31
32 SKIP_IF(require_paranoia_below(1));
33 FAIL_IF(event_open_with_cpu(event, cpu));
34 FAIL_IF(event_enable(event));
35
36 return 0;
37 }
38
cpu_event_pinned_vs_ebb(void)39 int cpu_event_pinned_vs_ebb(void)
40 {
41 union pipe read_pipe, write_pipe;
42 struct event event;
43 int cpu, rc;
44 pid_t pid;
45
46 SKIP_IF(!ebb_is_supported());
47
48 cpu = bind_to_cpu(BIND_CPU_ANY);
49 FAIL_IF(cpu < 0);
50
51 FAIL_IF(pipe(read_pipe.fds) == -1);
52 FAIL_IF(pipe(write_pipe.fds) == -1);
53
54 pid = fork();
55 if (pid == 0) {
56 /* NB order of pipes looks reversed */
57 exit(ebb_child(write_pipe, read_pipe));
58 }
59
60 /* We setup the cpu event first */
61 rc = setup_cpu_event(&event, cpu);
62 if (rc) {
63 kill_child_and_wait(pid);
64 return rc;
65 }
66
67 /* Signal the child to install its EBB event and wait */
68 if (sync_with_child(read_pipe, write_pipe))
69 /* If it fails, wait for it to exit */
70 goto wait;
71
72 /* Signal the child to run */
73 FAIL_IF(sync_with_child(read_pipe, write_pipe));
74
75 wait:
76 /* We expect it to fail to read the event */
77 FAIL_IF(wait_for_child(pid) != 2);
78
79 FAIL_IF(event_disable(&event));
80 FAIL_IF(event_read(&event));
81
82 event_report(&event);
83
84 /* The cpu event should have run */
85 FAIL_IF(event.result.value == 0);
86 FAIL_IF(event.result.enabled != event.result.running);
87
88 return 0;
89 }
90
main(void)91 int main(void)
92 {
93 return test_harness(cpu_event_pinned_vs_ebb, "cpu_event_pinned_vs_ebb");
94 }
95