// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2014, Michael Ellerman, IBM Corp. */ #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 we can setup an EBB on our child. Nothing interesting happens, because * even though the event is enabled and running the child hasn't enabled the * actual delivery of the EBBs. */ static int victim_child(union pipe read_pipe, union pipe write_pipe) { int i; FAIL_IF(wait_for_parent(read_pipe)); FAIL_IF(notify_parent(write_pipe)); /* Parent creates EBB event */ FAIL_IF(wait_for_parent(read_pipe)); FAIL_IF(notify_parent(write_pipe)); /* Check the EBB is enabled by writing PMC1 */ write_pmc1(); /* EBB event is enabled here */ for (i = 0; i < 1000000; i++) ; return 0; } int ebb_on_child(void) { union pipe read_pipe, write_pipe; struct event event; pid_t pid; 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(victim_child(write_pipe, read_pipe)); } FAIL_IF(sync_with_child(read_pipe, write_pipe)); /* Child is running now */ event_init_named(&event, 0x1001e, "cycles"); event_leader_ebb_init(&event); event.attr.exclude_kernel = 1; event.attr.exclude_hv = 1; event.attr.exclude_idle = 1; FAIL_IF(event_open_with_pid(&event, pid)); FAIL_IF(ebb_event_enable(&event)); FAIL_IF(sync_with_child(read_pipe, write_pipe)); /* Child should just exit happily */ FAIL_IF(wait_for_child(pid)); event_close(&event); return 0; } int main(void) { return test_harness(ebb_on_child, "ebb_on_child"); }