| // 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"); |
| } |