no_handler_test.c (1157B)
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 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}