/* * 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 pinned per-task event vs an EBB - in that order. The pinned per-task * event should prevent the EBB event from being enabled. */ static int setup_child_event(struct event *event, pid_t child_pid) { event_init_named(event, 0x400FA, "PM_RUN_INST_CMPL"); event->attr.pinned = 1; event->attr.exclude_kernel = 1; event->attr.exclude_hv = 1; event->attr.exclude_idle = 1; FAIL_IF(event_open_with_pid(event, child_pid)); FAIL_IF(event_enable(event)); return 0; } int task_event_pinned_vs_ebb(void) { union pipe read_pipe, write_pipe; struct event event; pid_t pid; int rc; SKIP_IF(!ebb_is_supported()); 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 task event first */ rc = setup_child_event(&event, pid); 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 it to fail to read the event */ FAIL_IF(wait_for_child(pid) != 2); FAIL_IF(event_disable(&event)); FAIL_IF(event_read(&event)); event_report(&event); FAIL_IF(event.result.value == 0); /* * For reasons I don't understand enabled is usually just slightly * lower than running. Would be good to confirm why. */ FAIL_IF(event.result.enabled == 0); FAIL_IF(event.result.running == 0); return 0; } int main(void) { return test_harness(task_event_pinned_vs_ebb, "task_event_pinned_vs_ebb"); }