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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright 2021, Athira Rajeev, 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 and16 * sets MMCR0_PMCCEXT preventing further read access to the17 * group B PMU registers.18 */19 20static int regs_access_pmccext(void)21{22 struct event event;23 24 SKIP_IF(!ebb_is_supported());25 26 event_init_named(&event, 0x1001e, "cycles");27 event_leader_ebb_init(&event);28 29 FAIL_IF(event_open(&event));30 31 ebb_enable_pmc_counting(1);32 setup_ebb_handler(standard_ebb_callee);33 ebb_global_enable();34 FAIL_IF(ebb_event_enable(&event));35 36 mtspr(SPRN_PMC1, pmc_sample_period(sample_period));37 38 while (ebb_state.stats.ebb_count < 1)39 FAIL_IF(core_busy_loop());40 41 ebb_global_disable();42 event_close(&event);43 44 FAIL_IF(ebb_state.stats.ebb_count == 0);45 46 /*47 * For ISA v3.1, verify the test takes a SIGILL when reading48 * PMU regs after the event is closed. With the control bit49 * in MMCR0 (PMCCEXT) restricting access to group B PMU regs,50 * sigill is expected.51 */52 if (have_hwcap2(PPC_FEATURE2_ARCH_3_1))53 FAIL_IF(catch_sigill(dump_ebb_state));54 else55 dump_ebb_state();56 57 return 0;58}59 60int main(void)61{62 return test_harness(regs_access_pmccext, "regs_access_pmccext");63}64