/*
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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 <stdio.h>
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#include <stdlib.h>
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#include <setjmp.h>
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#include <signal.h>
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#include "ebb.h"
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/*
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* Test that closing the EBB event clears MMCR0_PMCC, preventing further access
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* by userspace to the PMU hardware.
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*/
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int close_clears_pmcc(void)
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{
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struct event event;
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SKIP_IF(!ebb_is_supported());
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event_init_named(&event, 0x1001e, "cycles");
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event_leader_ebb_init(&event);
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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 (ebb_state.stats.ebb_count < 1)
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FAIL_IF(core_busy_loop());
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ebb_global_disable();
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event_close(&event);
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FAIL_IF(ebb_state.stats.ebb_count == 0);
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/* The real test is here, do we take a SIGILL when writing PMU regs now
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* that we have closed the event. We expect that we will. */
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FAIL_IF(catch_sigill(write_pmc1));
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/* We should still be able to read EBB regs though */
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mfspr(SPRN_EBBHR);
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mfspr(SPRN_EBBRR);
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mfspr(SPRN_BESCR);
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return 0;
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}
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int main(void)
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{
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return test_harness(close_clears_pmcc, "close_clears_pmcc");
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}
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