projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| f50a7f3d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 3752e453 ME |
2 | /* |
| 3 | * Copyright 2014, Michael Ellerman, IBM Corp. | |
| 3752e453 ME |
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 cpu event vs an EBB - in that order. The EBB should force the cpu | |
| 19 | * event off the PMU. | |
| 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.exclude_kernel = 1; | |
| 27 | event->attr.exclude_hv = 1; | |
| 28 | event->attr.exclude_idle = 1; | |
| 29 | ||
| 30 | SKIP_IF(require_paranoia_below(1)); | |
| 31 | FAIL_IF(event_open_with_cpu(event, cpu)); | |
| 32 | FAIL_IF(event_enable(event)); | |
| 33 | ||
| 34 | return 0; | |
| 35 | } | |
| 36 | ||
| 37 | int cpu_event_vs_ebb(void) | |
| 38 | { | |
| 39 | union pipe read_pipe, write_pipe; | |
| 40 | struct event event; | |
| 41 | int cpu, rc; | |
| 42 | pid_t pid; | |
| 43 | ||
| 39fcfb91 DK |
44 | SKIP_IF(!ebb_is_supported()); |
| 45 | ||
| 3752e453 ME |
46 | cpu = pick_online_cpu(); |
| 47 | FAIL_IF(cpu < 0); | |
| 48 | FAIL_IF(bind_to_cpu(cpu)); | |
| 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(ebb_child(write_pipe, read_pipe)); | |
| 57 | } | |
| 58 | ||
| 59 | /* We setup the cpu event first */ | |
| 60 | rc = setup_cpu_event(&event, cpu); | |
| 61 | if (rc) { | |
| 62 | kill_child_and_wait(pid); | |
| 63 | return rc; | |
| 64 | } | |
| 65 | ||
| 66 | /* Signal the child to install its EBB event and wait */ | |
| 67 | if (sync_with_child(read_pipe, write_pipe)) | |
| 68 | /* If it fails, wait for it to exit */ | |
| 69 | goto wait; | |
| 70 | ||
| 71 | /* Signal the child to run */ | |
| 72 | FAIL_IF(sync_with_child(read_pipe, write_pipe)); | |
| 73 | ||
| 74 | wait: | |
| 75 | /* We expect the child to succeed */ | |
| 76 | FAIL_IF(wait_for_child(pid)); | |
| 77 | ||
| 78 | FAIL_IF(event_disable(&event)); | |
| 79 | FAIL_IF(event_read(&event)); | |
| 80 | ||
| 81 | event_report(&event); | |
| 82 | ||
| 83 | /* The cpu event may have run */ | |
| 84 | ||
| 85 | return 0; | |
| 86 | } | |
| 87 | ||
| 88 | int main(void) | |
| 89 | { | |
| 90 | return test_harness(cpu_event_vs_ebb, "cpu_event_vs_ebb"); | |
| 91 | } |