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 | |
22 | static int setup_cpu_event(struct event *event, int cpu) |
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 | SKIP_IF(require_paranoia_below(level: 1)); |
33 | FAIL_IF(event_open_with_cpu(e: event, cpu)); |
34 | FAIL_IF(event_enable(e: event)); |
35 | |
36 | return 0; |
37 | } |
38 | |
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(read_pipe: write_pipe, write_pipe: read_pipe)); |
58 | } |
59 | |
60 | /* We setup the cpu event first */ |
61 | rc = setup_cpu_event(event: &event, cpu); |
62 | if (rc) { |
63 | kill_child_and_wait(child_pid: 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(child_pid: pid) != 2); |
78 | |
79 | FAIL_IF(event_disable(e: &event)); |
80 | FAIL_IF(event_read(e: &event)); |
81 | |
82 | event_report(e: &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 | |
91 | int main(void) |
92 | { |
93 | return test_harness(cpu_event_pinned_vs_ebb, "cpu_event_pinned_vs_ebb" ); |
94 | } |
95 | |