// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2014, Michael Ellerman, IBM Corp.
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*/
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "ebb.h"
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/*
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* Tests we can setup an EBB on our child. Nothing interesting happens, because
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* even though the event is enabled and running the child hasn't enabled the
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* actual delivery of the EBBs.
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*/
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static int victim_child(union pipe read_pipe, union pipe write_pipe)
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{
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int i;
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FAIL_IF(wait_for_parent(read_pipe));
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FAIL_IF(notify_parent(write_pipe));
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/* Parent creates EBB event */
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FAIL_IF(wait_for_parent(read_pipe));
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FAIL_IF(notify_parent(write_pipe));
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/* Check the EBB is enabled by writing PMC1 */
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write_pmc1();
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/* EBB event is enabled here */
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for (i = 0; i < 1000000; i++) ;
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return 0;
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}
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int ebb_on_child(void)
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{
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union pipe read_pipe, write_pipe;
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struct event event;
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pid_t pid;
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SKIP_IF(!ebb_is_supported());
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FAIL_IF(pipe(read_pipe.fds) == -1);
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FAIL_IF(pipe(write_pipe.fds) == -1);
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pid = fork();
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if (pid == 0) {
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/* NB order of pipes looks reversed */
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exit(victim_child(write_pipe, read_pipe));
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}
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FAIL_IF(sync_with_child(read_pipe, write_pipe));
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/* Child is running now */
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event_init_named(&event, 0x1001e, "cycles");
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event_leader_ebb_init(&event);
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event.attr.exclude_kernel = 1;
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event.attr.exclude_hv = 1;
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event.attr.exclude_idle = 1;
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FAIL_IF(event_open_with_pid(&event, pid));
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FAIL_IF(ebb_event_enable(&event));
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FAIL_IF(sync_with_child(read_pipe, write_pipe));
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/* Child should just exit happily */
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FAIL_IF(wait_for_child(pid));
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event_close(&event);
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return 0;
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}
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int main(void)
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{
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return test_harness(ebb_on_child, "ebb_on_child");
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}
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