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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright 2014, Michael Ellerman, IBM Corp.4 */5 6#include <stdio.h>7#include <stdlib.h>8#include <setjmp.h>9#include <signal.h>10 11#include "ebb.h"12 13 14/*15 * Test that closing the EBB event clears MMCR0_PMCC, preventing further access16 * by userspace to the PMU hardware.17 */18 19int close_clears_pmcc(void)20{21 struct event event;22 23 SKIP_IF(!ebb_is_supported());24 25 event_init_named(&event, 0x1001e, "cycles");26 event_leader_ebb_init(&event);27 28 FAIL_IF(event_open(&event));29 30 ebb_enable_pmc_counting(1);31 setup_ebb_handler(standard_ebb_callee);32 ebb_global_enable();33 FAIL_IF(ebb_event_enable(&event));34 35 mtspr(SPRN_PMC1, pmc_sample_period(sample_period));36 37 while (ebb_state.stats.ebb_count < 1)38 FAIL_IF(core_busy_loop());39 40 ebb_global_disable();41 event_close(&event);42 43 FAIL_IF(ebb_state.stats.ebb_count == 0);44 45 /* The real test is here, do we take a SIGILL when writing PMU regs now46 * that we have closed the event. We expect that we will. */47 48 FAIL_IF(catch_sigill(write_pmc1));49 50 /* We should still be able to read EBB regs though */51 mfspr(SPRN_EBBHR);52 mfspr(SPRN_EBBRR);53 mfspr(SPRN_BESCR);54 55 return 0;56}57 58int main(void)59{60 return test_harness(close_clears_pmcc, "close_clears_pmcc");61}62