| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright 2014, Michael Ellerman, IBM Corp. |
| */ |
| |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdbool.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| #include "ebb.h" |
| |
| |
| /* |
| * Tests a cpu event vs an EBB - in that order. The EBB should force the cpu |
| * event off the PMU. |
| */ |
| |
| static int setup_cpu_event(struct event *event, int cpu) |
| { |
| event_init_named(event, 0x400FA, "PM_RUN_INST_CMPL"); |
| |
| event->attr.exclude_kernel = 1; |
| event->attr.exclude_hv = 1; |
| event->attr.exclude_idle = 1; |
| |
| SKIP_IF(require_paranoia_below(1)); |
| FAIL_IF(event_open_with_cpu(event, cpu)); |
| FAIL_IF(event_enable(event)); |
| |
| return 0; |
| } |
| |
| int cpu_event_vs_ebb(void) |
| { |
| union pipe read_pipe, write_pipe; |
| struct event event; |
| int cpu, rc; |
| pid_t pid; |
| |
| SKIP_IF(!ebb_is_supported()); |
| |
| cpu = pick_online_cpu(); |
| FAIL_IF(cpu < 0); |
| FAIL_IF(bind_to_cpu(cpu)); |
| |
| FAIL_IF(pipe(read_pipe.fds) == -1); |
| FAIL_IF(pipe(write_pipe.fds) == -1); |
| |
| pid = fork(); |
| if (pid == 0) { |
| /* NB order of pipes looks reversed */ |
| exit(ebb_child(write_pipe, read_pipe)); |
| } |
| |
| /* We setup the cpu event first */ |
| rc = setup_cpu_event(&event, cpu); |
| if (rc) { |
| kill_child_and_wait(pid); |
| return rc; |
| } |
| |
| /* Signal the child to install its EBB event and wait */ |
| if (sync_with_child(read_pipe, write_pipe)) |
| /* If it fails, wait for it to exit */ |
| goto wait; |
| |
| /* Signal the child to run */ |
| FAIL_IF(sync_with_child(read_pipe, write_pipe)); |
| |
| wait: |
| /* We expect the child to succeed */ |
| FAIL_IF(wait_for_child(pid)); |
| |
| FAIL_IF(event_disable(&event)); |
| FAIL_IF(event_read(&event)); |
| |
| event_report(&event); |
| |
| /* The cpu event may have run */ |
| |
| return 0; |
| } |
| |
| int main(void) |
| { |
| return test_harness(cpu_event_vs_ebb, "cpu_event_vs_ebb"); |
| } |