// 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"); }