| 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 | /* Test that things work sanely if we have no handler */ |
| 15 | |
| 16 | static int no_handler_test(void) |
| 17 | { |
| 18 | struct event event; |
| 19 | u64 val; |
| 20 | int i; |
| 21 | |
| 22 | SKIP_IF(!ebb_is_supported()); |
| 23 | |
| 24 | event_init_named(e: &event, config: 0x1001e, name: "cycles"); |
| 25 | event_leader_ebb_init(e: &event); |
| 26 | |
| 27 | event.attr.exclude_kernel = 1; |
| 28 | event.attr.exclude_hv = 1; |
| 29 | event.attr.exclude_idle = 1; |
| 30 | |
| 31 | FAIL_IF(event_open(e: &event)); |
| 32 | FAIL_IF(ebb_event_enable(e: &event)); |
| 33 | |
| 34 | val = mfspr(SPRN_EBBHR); |
| 35 | FAIL_IF(val != 0); |
| 36 | |
| 37 | /* Make sure it overflows quickly */ |
| 38 | sample_period = 1000; |
| 39 | mtspr(SPRN_PMC1, pmc_sample_period(value: sample_period)); |
| 40 | |
| 41 | /* Spin to make sure the event has time to overflow */ |
| 42 | for (i = 0; i < 1000; i++) |
| 43 | mb(); |
| 44 | |
| 45 | dump_ebb_state(); |
| 46 | |
| 47 | /* We expect to see the PMU frozen & PMAO set */ |
| 48 | val = mfspr(SPRN_MMCR0); |
| 49 | FAIL_IF(val != 0x0000000080000080); |
| 50 | |
| 51 | event_close(e: &event); |
| 52 | |
| 53 | /* The real test is that we never took an EBB at 0x0 */ |
| 54 | |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | int main(void) |
| 59 | { |
| 60 | return test_harness(no_handler_test,"no_handler_test"); |
| 61 | } |
| 62 |