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 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(e: event, config: 0x400FA, name: "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(e: event, pid: child_pid)); |
33 | FAIL_IF(event_enable(e: 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 | SKIP_IF(!ebb_is_supported()); |
46 | |
47 | FAIL_IF(pipe(read_pipe.fds) == -1); |
48 | FAIL_IF(pipe(write_pipe.fds) == -1); |
49 | |
50 | pid = fork(); |
51 | if (pid == 0) { |
52 | /* NB order of pipes looks reversed */ |
53 | exit(ebb_child(read_pipe: write_pipe, write_pipe: read_pipe)); |
54 | } |
55 | |
56 | /* We setup the task event first */ |
57 | rc = setup_child_event(event: &event, child_pid: pid); |
58 | if (rc) { |
59 | kill_child_and_wait(child_pid: pid); |
60 | return rc; |
61 | } |
62 | |
63 | /* Signal the child to install its EBB event and wait */ |
64 | if (sync_with_child(read_pipe, write_pipe)) |
65 | /* If it fails, wait for it to exit */ |
66 | goto wait; |
67 | |
68 | /* Signal the child to run */ |
69 | FAIL_IF(sync_with_child(read_pipe, write_pipe)); |
70 | |
71 | wait: |
72 | /* We expect it to fail to read the event */ |
73 | FAIL_IF(wait_for_child(child_pid: pid) != 2); |
74 | FAIL_IF(event_disable(e: &event)); |
75 | FAIL_IF(event_read(e: &event)); |
76 | |
77 | event_report(e: &event); |
78 | |
79 | FAIL_IF(event.result.value == 0); |
80 | /* |
81 | * For reasons I don't understand enabled is usually just slightly |
82 | * lower than running. Would be good to confirm why. |
83 | */ |
84 | FAIL_IF(event.result.enabled == 0); |
85 | FAIL_IF(event.result.running == 0); |
86 | |
87 | return 0; |
88 | } |
89 | |
90 | int main(void) |
91 | { |
92 | return test_harness(task_event_pinned_vs_ebb, "task_event_pinned_vs_ebb" ); |
93 | } |
94 | |