// 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 an EBB vs a cpu event - 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 ebb_vs_cpu_event(void)
{
        union pipe read_pipe, write_pipe;
        struct event event;
        int cpu, rc;
        pid_t pid;

        SKIP_IF(!ebb_is_supported());

        cpu = bind_to_cpu(BIND_CPU_ANY);
        FAIL_IF(cpu < 0);

        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));
        }

        /* Signal the child to install its EBB event and wait */
        FAIL_IF(sync_with_child(read_pipe, write_pipe));

        /* Now try to install our CPU event */
        rc = setup_cpu_event(&event, cpu);
        if (rc) {
                kill_child_and_wait(pid);
                return rc;
        }

        /* Signal the child to run */
        FAIL_IF(sync_with_child(read_pipe, write_pipe));

        /* .. and wait for it to complete */
        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, but we don't expect 100% */
        FAIL_IF(event.result.enabled >= event.result.running);

        return 0;
}

int main(void)
{
        return test_harness(ebb_vs_cpu_event, "ebb_vs_cpu_event");
}