/*
|
* Copyright 2014, Michael Ellerman, IBM Corp.
|
* Licensed under GPLv2.
|
*/
|
|
#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 we can setup an EBB on our child. The child expects this and enables
|
* EBBs, which are then delivered to the child, even though the event is
|
* created by the parent.
|
*/
|
|
static int victim_child(union pipe read_pipe, union pipe write_pipe)
|
{
|
FAIL_IF(wait_for_parent(read_pipe));
|
|
/* Setup our EBB handler, before the EBB event is created */
|
ebb_enable_pmc_counting(1);
|
setup_ebb_handler(standard_ebb_callee);
|
ebb_global_enable();
|
|
FAIL_IF(notify_parent(write_pipe));
|
|
while (ebb_state.stats.ebb_count < 20) {
|
FAIL_IF(core_busy_loop());
|
}
|
|
ebb_global_disable();
|
ebb_freeze_pmcs();
|
|
dump_ebb_state();
|
|
FAIL_IF(ebb_state.stats.ebb_count == 0);
|
|
return 0;
|
}
|
|
/* Tests we can setup an EBB on our child - if it's expecting it */
|
int ebb_on_willing_child(void)
|
{
|
union pipe read_pipe, write_pipe;
|
struct event event;
|
pid_t pid;
|
|
SKIP_IF(!ebb_is_supported());
|
|
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(victim_child(write_pipe, read_pipe));
|
}
|
|
/* Signal the child to setup its EBB handler */
|
FAIL_IF(sync_with_child(read_pipe, write_pipe));
|
|
/* Child is running now */
|
|
event_init_named(&event, 0x1001e, "cycles");
|
event_leader_ebb_init(&event);
|
|
event.attr.exclude_kernel = 1;
|
event.attr.exclude_hv = 1;
|
event.attr.exclude_idle = 1;
|
|
FAIL_IF(event_open_with_pid(&event, pid));
|
FAIL_IF(ebb_event_enable(&event));
|
|
/* Child show now take EBBs and then exit */
|
FAIL_IF(wait_for_child(pid));
|
|
event_close(&event);
|
|
return 0;
|
}
|
|
int main(void)
|
{
|
return test_harness(ebb_on_willing_child, "ebb_on_willing_child");
|
}
|
