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 we can setup an EBB on our child. Nothing interesting happens, because
19 * even though the event is enabled and running the child hasn't enabled the
20 * actual delivery of the EBBs.
21 */
22
23static int victim_child(union pipe read_pipe, union pipe write_pipe)
24{
25	int i;
26
27	FAIL_IF(wait_for_parent(read_pipe));
28	FAIL_IF(notify_parent(write_pipe));
29
30	/* Parent creates EBB event */
31
32	FAIL_IF(wait_for_parent(read_pipe));
33	FAIL_IF(notify_parent(write_pipe));
34
35	/* Check the EBB is enabled by writing PMC1 */
36	write_pmc1();
37
38	/* EBB event is enabled here */
39	for (i = 0; i < 1000000; i++) ;
40
41	return 0;
42}
43
44int ebb_on_child(void)
45{
46	union pipe read_pipe, write_pipe;
47	struct event event;
48	pid_t pid;
49
50	FAIL_IF(pipe(read_pipe.fds) == -1);
51	FAIL_IF(pipe(write_pipe.fds) == -1);
52
53	pid = fork();
54	if (pid == 0) {
55		/* NB order of pipes looks reversed */
56		exit(victim_child(write_pipe, read_pipe));
57	}
58
59	FAIL_IF(sync_with_child(read_pipe, write_pipe));
60
61	/* Child is running now */
62
63	event_init_named(&event, 0x1001e, "cycles");
64	event_leader_ebb_init(&event);
65
66	event.attr.exclude_kernel = 1;
67	event.attr.exclude_hv = 1;
68	event.attr.exclude_idle = 1;
69
70	FAIL_IF(event_open_with_pid(&event, pid));
71	FAIL_IF(ebb_event_enable(&event));
72
73	FAIL_IF(sync_with_child(read_pipe, write_pipe));
74
75	/* Child should just exit happily */
76	FAIL_IF(wait_for_child(pid));
77
78	event_close(&event);
79
80	return 0;
81}
82
83int main(void)
84{
85	return test_harness(ebb_on_child, "ebb_on_child");
86}
87