// 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");
|
}
|
