1/* 2 * Copyright 2014, Michael Ellerman, IBM Corp. 3 * Licensed under GPLv2. 4 */ 5 6#include <signal.h> 7#include <stdio.h> 8#include <stdlib.h> 9#include <stdbool.h> 10#include <sys/types.h> 11#include <sys/wait.h> 12#include <unistd.h> 13 14#include "ebb.h" 15 16 17/* 18 * Tests a cpu event vs an EBB - in that order. The EBB should force the cpu 19 * event off the PMU. 20 */ 21 22static int setup_cpu_event(struct event *event, int cpu) 23{ 24 event_init_named(event, 0x400FA, "PM_RUN_INST_CMPL"); 25 26 event->attr.exclude_kernel = 1; 27 event->attr.exclude_hv = 1; 28 event->attr.exclude_idle = 1; 29 30 SKIP_IF(require_paranoia_below(1)); 31 FAIL_IF(event_open_with_cpu(event, cpu)); 32 FAIL_IF(event_enable(event)); 33 34 return 0; 35} 36 37int cpu_event_vs_ebb(void) 38{ 39 union pipe read_pipe, write_pipe; 40 struct event event; 41 int cpu, rc; 42 pid_t pid; 43 44 cpu = pick_online_cpu(); 45 FAIL_IF(cpu < 0); 46 FAIL_IF(bind_to_cpu(cpu)); 47 48 FAIL_IF(pipe(read_pipe.fds) == -1); 49 FAIL_IF(pipe(write_pipe.fds) == -1); 50 51 pid = fork(); 52 if (pid == 0) { 53 /* NB order of pipes looks reversed */ 54 exit(ebb_child(write_pipe, read_pipe)); 55 } 56 57 /* We setup the cpu event first */ 58 rc = setup_cpu_event(&event, cpu); 59 if (rc) { 60 kill_child_and_wait(pid); 61 return rc; 62 } 63 64 /* Signal the child to install its EBB event and wait */ 65 if (sync_with_child(read_pipe, write_pipe)) 66 /* If it fails, wait for it to exit */ 67 goto wait; 68 69 /* Signal the child to run */ 70 FAIL_IF(sync_with_child(read_pipe, write_pipe)); 71 72wait: 73 /* We expect the child to succeed */ 74 FAIL_IF(wait_for_child(pid)); 75 76 FAIL_IF(event_disable(&event)); 77 FAIL_IF(event_read(&event)); 78 79 event_report(&event); 80 81 /* The cpu event may have run */ 82 83 return 0; 84} 85 86int main(void) 87{ 88 return test_harness(cpu_event_vs_ebb, "cpu_event_vs_ebb"); 89} 90