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 pinned cpu event vs an EBB - in that order. The pinned cpu event 19 * should remain and the EBB event should fail to enable. 20 */ 21 22 static int setup_cpu_event(struct event *event, int cpu) 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 SKIP_IF(require_paranoia_below(1)); 33 FAIL_IF(event_open_with_cpu(event, cpu)); 34 FAIL_IF(event_enable(event)); 35 36 return 0; 37 } 38 39 int cpu_event_pinned_vs_ebb(void) 40 { 41 union pipe read_pipe, write_pipe; 42 struct event event; 43 int cpu, rc; 44 pid_t pid; 45 46 SKIP_IF(!ebb_is_supported()); 47 48 cpu = pick_online_cpu(); 49 FAIL_IF(cpu < 0); 50 FAIL_IF(bind_to_cpu(cpu)); 51 52 FAIL_IF(pipe(read_pipe.fds) == -1); 53 FAIL_IF(pipe(write_pipe.fds) == -1); 54 55 pid = fork(); 56 if (pid == 0) { 57 /* NB order of pipes looks reversed */ 58 exit(ebb_child(write_pipe, read_pipe)); 59 } 60 61 /* We setup the cpu event first */ 62 rc = setup_cpu_event(&event, cpu); 63 if (rc) { 64 kill_child_and_wait(pid); 65 return rc; 66 } 67 68 /* Signal the child to install its EBB event and wait */ 69 if (sync_with_child(read_pipe, write_pipe)) 70 /* If it fails, wait for it to exit */ 71 goto wait; 72 73 /* Signal the child to run */ 74 FAIL_IF(sync_with_child(read_pipe, write_pipe)); 75 76 wait: 77 /* We expect it to fail to read the event */ 78 FAIL_IF(wait_for_child(pid) != 2); 79 80 FAIL_IF(event_disable(&event)); 81 FAIL_IF(event_read(&event)); 82 83 event_report(&event); 84 85 /* The cpu event should have run */ 86 FAIL_IF(event.result.value == 0); 87 FAIL_IF(event.result.enabled != event.result.running); 88 89 return 0; 90 } 91 92 int main(void) 93 { 94 return test_harness(cpu_event_pinned_vs_ebb, "cpu_event_pinned_vs_ebb"); 95 } 96