// 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");
|
}
|
