| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 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 access |
| 16 | * by userspace to the PMU hardware. |
| 17 | */ |
| 18 | |
| 19 | int close_clears_pmcc(void) |
| 20 | { |
| 21 | struct event event; |
| 22 | |
| 23 | SKIP_IF(!ebb_is_supported()); |
| 24 | |
| 25 | event_init_named(e: &event, config: 0x1001e, name: "cycles"); |
| 26 | event_leader_ebb_init(e: &event); |
| 27 | |
| 28 | FAIL_IF(event_open(e: &event)); |
| 29 | |
| 30 | ebb_enable_pmc_counting(pmc: 1); |
| 31 | setup_ebb_handler(standard_ebb_callee); |
| 32 | ebb_global_enable(); |
| 33 | FAIL_IF(ebb_event_enable(e: &event)); |
| 34 | |
| 35 | mtspr(SPRN_PMC1, pmc_sample_period(value: 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(e: &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 now |
| 46 | * that we have closed the event. We expect that we will. */ |
| 47 | |
| 48 | FAIL_IF(catch_sigill(func: 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 | |
| 58 | int main(void) |
| 59 | { |
| 60 | return test_harness(close_clears_pmcc, "close_clears_pmcc"); |
| 61 | } |
| 62 |