// 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 an EBB vs a cpu event - in that order. The EBB should force the cpu
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* event off the PMU.
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*/
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static int setup_cpu_event(struct event *event, int cpu)
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{
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event_init_named(event, 0x400FA, "PM_RUN_INST_CMPL");
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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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SKIP_IF(require_paranoia_below(1));
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FAIL_IF(event_open_with_cpu(event, cpu));
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FAIL_IF(event_enable(event));
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return 0;
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}
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int ebb_vs_cpu_event(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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int cpu, rc;
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pid_t pid;
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SKIP_IF(!ebb_is_supported());
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cpu = pick_online_cpu();
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FAIL_IF(cpu < 0);
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FAIL_IF(bind_to_cpu(cpu));
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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(ebb_child(write_pipe, read_pipe));
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}
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/* Signal the child to install its EBB event and wait */
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FAIL_IF(sync_with_child(read_pipe, write_pipe));
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/* Now try to install our CPU event */
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rc = setup_cpu_event(&event, cpu);
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if (rc) {
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kill_child_and_wait(pid);
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return rc;
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}
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/* Signal the child to run */
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FAIL_IF(sync_with_child(read_pipe, write_pipe));
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/* .. and wait for it to complete */
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FAIL_IF(wait_for_child(pid));
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FAIL_IF(event_disable(&event));
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FAIL_IF(event_read(&event));
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event_report(&event);
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/* The cpu event may have run, but we don't expect 100% */
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FAIL_IF(event.result.enabled >= event.result.running);
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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_vs_cpu_event, "ebb_vs_cpu_event");
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}
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