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 = bind_to_cpu(BIND_CPU_ANY); 49 FAIL_IF(cpu < 0); 50 51 FAIL_IF(pipe(read_pipe.fds) == -1); 52 FAIL_IF(pipe(write_pipe.fds) == -1); 53 54 pid = fork(); 55 if (pid == 0) { 56 /* NB order of pipes looks reversed */ 57 exit(ebb_child(write_pipe, read_pipe)); 58 } 59 60 /* We setup the cpu event first */ 61 rc = setup_cpu_event(&event, cpu); 62 if (rc) { 63 kill_child_and_wait(pid); 64 return rc; 65 } 66 67 /* Signal the child to install its EBB event and wait */ 68 if (sync_with_child(read_pipe, write_pipe)) 69 /* If it fails, wait for it to exit */ 70 goto wait; 71 72 /* Signal the child to run */ 73 FAIL_IF(sync_with_child(read_pipe, write_pipe)); 74 75 wait: 76 /* We expect it to fail to read the event */ 77 FAIL_IF(wait_for_child(pid) != 2); 78 79 FAIL_IF(event_disable(&event)); 80 FAIL_IF(event_read(&event)); 81 82 event_report(&event); 83 84 /* The cpu event should have run */ 85 FAIL_IF(event.result.value == 0); 86 FAIL_IF(event.result.enabled != event.result.running); 87 88 return 0; 89 } 90 91 int main(void) 92 { 93 return test_harness(cpu_event_pinned_vs_ebb, "cpu_event_pinned_vs_ebb"); 94 } 95