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 pinned per-task event vs an EBB - in that order. The pinned per-task 19 * event should prevent the EBB event from being enabled. 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.pinned = 1; 27 28 event->attr.exclude_kernel = 1; 29 event->attr.exclude_hv = 1; 30 event->attr.exclude_idle = 1; 31 32 FAIL_IF(event_open_with_pid(event, child_pid)); 33 FAIL_IF(event_enable(event)); 34 35 return 0; 36 } 37 38 int task_event_pinned_vs_ebb(void) 39 { 40 union pipe read_pipe, write_pipe; 41 struct event event; 42 pid_t pid; 43 int rc; 44 45 SKIP_IF(!ebb_is_supported()); 46 47 FAIL_IF(pipe(read_pipe.fds) == -1); 48 FAIL_IF(pipe(write_pipe.fds) == -1); 49 50 pid = fork(); 51 if (pid == 0) { 52 /* NB order of pipes looks reversed */ 53 exit(ebb_child(write_pipe, read_pipe)); 54 } 55 56 /* We setup the task event first */ 57 rc = setup_child_event(&event, pid); 58 if (rc) { 59 kill_child_and_wait(pid); 60 return rc; 61 } 62 63 /* Signal the child to install its EBB event and wait */ 64 if (sync_with_child(read_pipe, write_pipe)) 65 /* If it fails, wait for it to exit */ 66 goto wait; 67 68 /* Signal the child to run */ 69 FAIL_IF(sync_with_child(read_pipe, write_pipe)); 70 71 wait: 72 /* We expect it to fail to read the event */ 73 FAIL_IF(wait_for_child(pid) != 2); 74 FAIL_IF(event_disable(&event)); 75 FAIL_IF(event_read(&event)); 76 77 event_report(&event); 78 79 FAIL_IF(event.result.value == 0); 80 /* 81 * For reasons I don't understand enabled is usually just slightly 82 * lower than running. Would be good to confirm why. 83 */ 84 FAIL_IF(event.result.enabled == 0); 85 FAIL_IF(event.result.running == 0); 86 87 return 0; 88 } 89 90 int main(void) 91 { 92 return test_harness(task_event_pinned_vs_ebb, "task_event_pinned_vs_ebb"); 93 } 94