1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2014, Michael Ellerman, IBM Corp. 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 per-task event vs an EBB - in that order. The EBB should push the 19 * per-task event off the PMU. 20 */ 21 22 static int setup_child_event(struct event *event, pid_t child_pid) 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 FAIL_IF(event_open_with_pid(event, child_pid)); 31 FAIL_IF(event_enable(event)); 32 33 return 0; 34 } 35 36 int task_event_vs_ebb(void) 37 { 38 union pipe read_pipe, write_pipe; 39 struct event event; 40 pid_t pid; 41 int rc; 42 43 SKIP_IF(!ebb_is_supported()); 44 45 FAIL_IF(pipe(read_pipe.fds) == -1); 46 FAIL_IF(pipe(write_pipe.fds) == -1); 47 48 pid = fork(); 49 if (pid == 0) { 50 /* NB order of pipes looks reversed */ 51 exit(ebb_child(write_pipe, read_pipe)); 52 } 53 54 /* We setup the task event first */ 55 rc = setup_child_event(&event, pid); 56 if (rc) { 57 kill_child_and_wait(pid); 58 return rc; 59 } 60 61 /* Signal the child to install its EBB event and wait */ 62 if (sync_with_child(read_pipe, write_pipe)) 63 /* If it fails, wait for it to exit */ 64 goto wait; 65 66 /* Signal the child to run */ 67 FAIL_IF(sync_with_child(read_pipe, write_pipe)); 68 69 wait: 70 /* The EBB event should push the task event off so the child should succeed */ 71 FAIL_IF(wait_for_child(pid)); 72 FAIL_IF(event_disable(&event)); 73 FAIL_IF(event_read(&event)); 74 75 event_report(&event); 76 77 /* The task event may have run, or not so we can't assert anything about it */ 78 79 return 0; 80 } 81 82 int main(void) 83 { 84 return test_harness(task_event_vs_ebb, "task_event_vs_ebb"); 85 } 86