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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2021, Athira Rajeev, IBM Corp.
*/
#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>
#include <signal.h>
#include "ebb.h"
/*
* Test that closing the EBB event clears MMCR0_PMCC and
* sets MMCR0_PMCCEXT preventing further read access to the
* group B PMU registers.
*/
static int regs_access_pmccext(void)
{
struct event event;
SKIP_IF(!ebb_is_supported());
event_init_named(&event, 0x1001e, "cycles");
event_leader_ebb_init(&event);
FAIL_IF(event_open(&event));
ebb_enable_pmc_counting(1);
setup_ebb_handler(standard_ebb_callee);
ebb_global_enable();
FAIL_IF(ebb_event_enable(&event));
mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
while (ebb_state.stats.ebb_count < 1)
FAIL_IF(core_busy_loop());
ebb_global_disable();
event_close(&event);
FAIL_IF(ebb_state.stats.ebb_count == 0);
/*
* For ISA v3.1, verify the test takes a SIGILL when reading
* PMU regs after the event is closed. With the control bit
* in MMCR0 (PMCCEXT) restricting access to group B PMU regs,
* sigill is expected.
*/
if (have_hwcap2(PPC_FEATURE2_ARCH_3_1))
FAIL_IF(catch_sigill(dump_ebb_state));
else
dump_ebb_state();
return 0;
}
int main(void)
{
return test_harness(regs_access_pmccext, "regs_access_pmccext");
}
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