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Linux/tools/testing/selftests/powerpc/pmu/ebb/task_event_vs_ebb_test.c

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  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 

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