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
22static 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
39int 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
75wait:
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
91int main(void)
92{
93	return test_harness(cpu_event_pinned_vs_ebb, "cpu_event_pinned_vs_ebb");
94}
95