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/*
* Copyright 2014, Michael Ellerman, IBM Corp.
* Licensed under GPLv2.
*/
#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>
#include <signal.h>
#include "ebb.h"
/*
* Test that closing the EBB event clears MMCR0_PMCC, preventing further access
* by userspace to the PMU hardware.
*/
int close_clears_pmcc(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);
/* The real test is here, do we take a SIGILL when writing PMU regs now
* that we have closed the event. We expect that we will. */
FAIL_IF(catch_sigill(write_pmc1));
/* We should still be able to read EBB regs though */
mfspr(SPRN_EBBHR);
mfspr(SPRN_EBBRR);
mfspr(SPRN_BESCR);
return 0;
}
int main(void)
{
return test_harness(close_clears_pmcc, "close_clears_pmcc");
}
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