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 an EBB vs a cpu event - in that order. The EBB should force the cpu 19 * event off the PMU. 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.exclude_kernel = 1; 27 event->attr.exclude_hv = 1; 28 event->attr.exclude_idle = 1; 29 30 SKIP_IF(require_paranoia_below(1)); 31 FAIL_IF(event_open_with_cpu(event, cpu)); 32 FAIL_IF(event_enable(event)); 33 34 return 0; 35 } 36 37 int ebb_vs_cpu_event(void) 38 { 39 union pipe read_pipe, write_pipe; 40 struct event event; 41 int cpu, rc; 42 pid_t pid; 43 44 SKIP_IF(!ebb_is_supported()); 45 46 cpu = bind_to_cpu(BIND_CPU_ANY); 47 FAIL_IF(cpu < 0); 48 49 FAIL_IF(pipe(read_pipe.fds) == -1); 50 FAIL_IF(pipe(write_pipe.fds) == -1); 51 52 pid = fork(); 53 if (pid == 0) { 54 /* NB order of pipes looks reversed */ 55 exit(ebb_child(write_pipe, read_pipe)); 56 } 57 58 /* Signal the child to install its EBB event and wait */ 59 FAIL_IF(sync_with_child(read_pipe, write_pipe)); 60 61 /* Now try to install our CPU event */ 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 run */ 69 FAIL_IF(sync_with_child(read_pipe, write_pipe)); 70 71 /* .. and wait for it to complete */ 72 FAIL_IF(wait_for_child(pid)); 73 FAIL_IF(event_disable(&event)); 74 FAIL_IF(event_read(&event)); 75 76 event_report(&event); 77 78 /* The cpu event may have run, but we don't expect 100% */ 79 FAIL_IF(event.result.enabled >= event.result.running); 80 81 return 0; 82 } 83 84 int main(void) 85 { 86 return test_harness(ebb_vs_cpu_event, "ebb_vs_cpu_event"); 87 } 88