/*
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* Copyright 2014, Michael Ellerman, IBM Corp.
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* Licensed under GPLv2.
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*/
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include "ebb.h"
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/*
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* Test running multiple EBB using processes at once on a single CPU. They
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* should all run happily without interfering with each other.
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*/
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static bool child_should_exit;
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static void sigint_handler(int signal)
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{
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child_should_exit = true;
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}
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struct sigaction sigint_action = {
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.sa_handler = sigint_handler,
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};
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static int cycles_child(void)
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{
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struct event event;
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if (sigaction(SIGINT, &sigint_action, NULL)) {
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perror("sigaction");
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return 1;
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}
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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(&event));
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ebb_enable_pmc_counting(1);
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setup_ebb_handler(standard_ebb_callee);
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ebb_global_enable();
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FAIL_IF(ebb_event_enable(&event));
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mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
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while (!child_should_exit) {
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FAIL_IF(core_busy_loop());
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FAIL_IF(ebb_check_mmcr0());
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}
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ebb_global_disable();
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ebb_freeze_pmcs();
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dump_summary_ebb_state();
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event_close(&event);
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FAIL_IF(ebb_state.stats.ebb_count == 0);
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return 0;
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}
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#define NR_CHILDREN 4
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int multi_ebb_procs(void)
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{
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pid_t pids[NR_CHILDREN];
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int cpu, rc, i;
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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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for (i = 0; i < NR_CHILDREN; i++) {
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pids[i] = fork();
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if (pids[i] == 0)
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exit(cycles_child());
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}
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/* Have them all run for "a while" */
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sleep(10);
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rc = 0;
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for (i = 0; i < NR_CHILDREN; i++) {
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/* Tell them to stop */
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kill(pids[i], SIGINT);
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/* And wait */
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rc |= wait_for_child(pids[i]);
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}
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return rc;
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}
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int main(void)
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{
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return test_harness(multi_ebb_procs, "multi_ebb_procs");
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}
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