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 pinned per-task event vs an EBB - in that order. The pinned per-task
19  * event should prevent the EBB event from being enabled.
20  */
21 
22 static int setup_child_event(struct event *event, pid_t child_pid)
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 	FAIL_IF(event_open_with_pid(event, child_pid));
33 	FAIL_IF(event_enable(event));
34 
35 	return 0;
36 }
37 
38 int task_event_pinned_vs_ebb(void)
39 {
40 	union pipe read_pipe, write_pipe;
41 	struct event event;
42 	pid_t pid;
43 	int rc;
44 
45 	FAIL_IF(pipe(read_pipe.fds) == -1);
46 	FAIL_IF(pipe(write_pipe.fds) == -1);
47 
48 	pid = fork();
49 	if (pid == 0) {
50 		/* NB order of pipes looks reversed */
51 		exit(ebb_child(write_pipe, read_pipe));
52 	}
53 
54 	/* We setup the task event first */
55 	rc = setup_child_event(&event, pid);
56 	if (rc) {
57 		kill_child_and_wait(pid);
58 		return rc;
59 	}
60 
61 	/* Signal the child to install its EBB event and wait */
62 	if (sync_with_child(read_pipe, write_pipe))
63 		/* If it fails, wait for it to exit */
64 		goto wait;
65 
66 	/* Signal the child to run */
67 	FAIL_IF(sync_with_child(read_pipe, write_pipe));
68 
69 wait:
70 	/* We expect it to fail to read the event */
71 	FAIL_IF(wait_for_child(pid) != 2);
72 	FAIL_IF(event_disable(&event));
73 	FAIL_IF(event_read(&event));
74 
75 	event_report(&event);
76 
77 	FAIL_IF(event.result.value == 0);
78 	/*
79 	 * For reasons I don't understand enabled is usually just slightly
80 	 * lower than running. Would be good to confirm why.
81 	 */
82 	FAIL_IF(event.result.enabled == 0);
83 	FAIL_IF(event.result.running == 0);
84 
85 	return 0;
86 }
87 
88 int main(void)
89 {
90 	return test_harness(task_event_pinned_vs_ebb, "task_event_pinned_vs_ebb");
91 }
92