62 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*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 16static 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(&event, 0x1001e, "cycles");25 event_leader_ebb_init(&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(&event));32 FAIL_IF(ebb_event_enable(&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(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(&event);52 53 /* The real test is that we never took an EBB at 0x0 */54 55 return 0;56}57 58int main(void)59{60 return test_harness(no_handler_test,"no_handler_test");61}62