projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 3752e453 ME |
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 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(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 | ||
| 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 | ||
| 39fcfb91 DK |
46 | SKIP_IF(!ebb_is_supported()); |
| 47 | ||
| 3752e453 ME |
48 | cpu = pick_online_cpu(); |
| 49 | FAIL_IF(cpu < 0); | |
| 50 | FAIL_IF(bind_to_cpu(cpu)); | |
| 51 | ||
| 52 | FAIL_IF(pipe(read_pipe.fds) == -1); | |
| 53 | FAIL_IF(pipe(write_pipe.fds) == -1); | |
| 54 | ||
| 55 | pid = fork(); | |
| 56 | if (pid == 0) { | |
| 57 | /* NB order of pipes looks reversed */ | |
| 58 | exit(ebb_child(write_pipe, read_pipe)); | |
| 59 | } | |
| 60 | ||
| 61 | /* We setup the cpu event first */ | |
| 62 | rc = setup_cpu_event(&event, cpu); | |
| 63 | if (rc) { | |
| 64 | kill_child_and_wait(pid); | |
| 65 | return rc; | |
| 66 | } | |
| 67 | ||
| 68 | /* Signal the child to install its EBB event and wait */ | |
| 69 | if (sync_with_child(read_pipe, write_pipe)) | |
| 70 | /* If it fails, wait for it to exit */ | |
| 71 | goto wait; | |
| 72 | ||
| 73 | /* Signal the child to run */ | |
| 74 | FAIL_IF(sync_with_child(read_pipe, write_pipe)); | |
| 75 | ||
| 76 | wait: | |
| 77 | /* We expect it to fail to read the event */ | |
| 78 | FAIL_IF(wait_for_child(pid) != 2); | |
| 79 | ||
| 80 | FAIL_IF(event_disable(&event)); | |
| 81 | FAIL_IF(event_read(&event)); | |
| 82 | ||
| 83 | event_report(&event); | |
| 84 | ||
| 85 | /* The cpu event should have run */ | |
| 86 | FAIL_IF(event.result.value == 0); | |
| 87 | FAIL_IF(event.result.enabled != event.result.running); | |
| 88 | ||
| 89 | return 0; | |
| 90 | } | |
| 91 | ||
| 92 | int main(void) | |
| 93 | { | |
| 94 | return test_harness(cpu_event_pinned_vs_ebb, "cpu_event_pinned_vs_ebb"); | |
| 95 | } |