// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2014, Michael Ellerman, IBM Corp.
 */

#include <stdio.h>
#include <stdlib.h>

#include "ebb.h"


/*
 * Test that PMC5 & 6 are frozen (ie. don't overflow) when they are not being
 * used. Tests the MMCR0_FC56 logic in the kernel.
 */

static int pmc56_overflowed;

static void ebb_callee(void)
{
        uint64_t val;

        val = mfspr(SPRN_BESCR);
        if (!(val & BESCR_PMEO)) {
                ebb_state.stats.spurious++;
                goto out;
        }

        ebb_state.stats.ebb_count++;
        count_pmc(2, sample_period);

        val = mfspr(SPRN_PMC5);
        if (val >= COUNTER_OVERFLOW)
                pmc56_overflowed++;

        count_pmc(5, COUNTER_OVERFLOW);

        val = mfspr(SPRN_PMC6);
        if (val >= COUNTER_OVERFLOW)
                pmc56_overflowed++;

        count_pmc(6, COUNTER_OVERFLOW);

out:
        reset_ebb();
}

int pmc56_overflow(void)
{
        struct event event;

        SKIP_IF(!ebb_is_supported());

        /* Use PMC2 so we set PMCjCE, which enables PMC5/6 */
        event_init(&event, 0x2001e);
        event_leader_ebb_init(&event);

        event.attr.exclude_kernel = 1;
        event.attr.exclude_hv = 1;
        event.attr.exclude_idle = 1;

        FAIL_IF(event_open(&event));

        setup_ebb_handler(ebb_callee);
        ebb_global_enable();

        FAIL_IF(ebb_event_enable(&event));

        mtspr(SPRN_PMC2, pmc_sample_period(sample_period));
        mtspr(SPRN_PMC5, 0);
        mtspr(SPRN_PMC6, 0);

        while (ebb_state.stats.ebb_count < 10)
                FAIL_IF(core_busy_loop());

        ebb_global_disable();
        ebb_freeze_pmcs();

        dump_ebb_state();

        printf("PMC5/6 overflow %d\n", pmc56_overflowed);

        event_close(&event);

        FAIL_IF(ebb_state.stats.ebb_count == 0 || pmc56_overflowed != 0);

        return 0;
}

int main(void)
{
        return test_harness(pmc56_overflow, "pmc56_overflow");
}