| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 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 and |
| 16 | * sets MMCR0_PMCCEXT preventing further read access to the |
| 17 | * group B PMU registers. |
| 18 | */ |
| 19 | |
| 20 | static int regs_access_pmccext(void) |
| 21 | { |
| 22 | struct event event; |
| 23 | |
| 24 | SKIP_IF(!ebb_is_supported()); |
| 25 | |
| 26 | event_init_named(e: &event, config: 0x1001e, name: "cycles"); |
| 27 | event_leader_ebb_init(e: &event); |
| 28 | |
| 29 | FAIL_IF(event_open(e: &event)); |
| 30 | |
| 31 | ebb_enable_pmc_counting(pmc: 1); |
| 32 | setup_ebb_handler(standard_ebb_callee); |
| 33 | ebb_global_enable(); |
| 34 | FAIL_IF(ebb_event_enable(e: &event)); |
| 35 | |
| 36 | mtspr(SPRN_PMC1, pmc_sample_period(value: 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(e: &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 reading |
| 48 | * PMU regs after the event is closed. With the control bit |
| 49 | * 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(func: dump_ebb_state)); |
| 54 | else |
| 55 | dump_ebb_state(); |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | int main(void) |
| 61 | { |
| 62 | return test_harness(regs_access_pmccext, "regs_access_pmccext"); |
| 63 | } |
| 64 |