/* * Copyright 2014, Michael Ellerman, IBM Corp. * Licensed under GPLv2. */ #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <stdbool.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> #include "ebb.h" /* * Tests a cpu event vs an EBB - in that order. The EBB should force the cpu * event off the PMU. */ static int setup_cpu_event(struct event *event, int cpu) { event_init_named(event, 0x400FA, "PM_RUN_INST_CMPL"); event->attr.exclude_kernel = 1; event->attr.exclude_hv = 1; event->attr.exclude_idle = 1; SKIP_IF(require_paranoia_below(1)); FAIL_IF(event_open_with_cpu(event, cpu)); FAIL_IF(event_enable(event)); return 0; } int cpu_event_vs_ebb(void) { union pipe read_pipe, write_pipe; struct event event; int cpu, rc; pid_t pid; SKIP_IF(!ebb_is_supported()); cpu = pick_online_cpu(); FAIL_IF(cpu < 0); FAIL_IF(bind_to_cpu(cpu)); FAIL_IF(pipe(read_pipe.fds) == -1); FAIL_IF(pipe(write_pipe.fds) == -1); pid = fork(); if (pid == 0) { /* NB order of pipes looks reversed */ exit(ebb_child(write_pipe, read_pipe)); } /* We setup the cpu event first */ rc = setup_cpu_event(&event, cpu); if (rc) { kill_child_and_wait(pid); return rc; } /* Signal the child to install its EBB event and wait */ if (sync_with_child(read_pipe, write_pipe)) /* If it fails, wait for it to exit */ goto wait; /* Signal the child to run */ FAIL_IF(sync_with_child(read_pipe, write_pipe)); wait: /* We expect the child to succeed */ FAIL_IF(wait_for_child(pid)); FAIL_IF(event_disable(&event)); FAIL_IF(event_read(&event)); event_report(&event); /* The cpu event may have run */ return 0; } int main(void) { return test_harness(cpu_event_vs_ebb, "cpu_event_vs_ebb"); }