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

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  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 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         FAIL_IF(pipe(read_pipe.fds) == -1);
 44         FAIL_IF(pipe(write_pipe.fds) == -1);
 45 
 46         pid = fork();
 47         if (pid == 0) {
 48                 /* NB order of pipes looks reversed */
 49                 exit(ebb_child(write_pipe, read_pipe));
 50         }
 51 
 52         /* We setup the task event first */
 53         rc = setup_child_event(&event, pid);
 54         if (rc) {
 55                 kill_child_and_wait(pid);
 56                 return rc;
 57         }
 58 
 59         /* Signal the child to install its EBB event and wait */
 60         if (sync_with_child(read_pipe, write_pipe))
 61                 /* If it fails, wait for it to exit */
 62                 goto wait;
 63 
 64         /* Signal the child to run */
 65         FAIL_IF(sync_with_child(read_pipe, write_pipe));
 66 
 67 wait:
 68         /* The EBB event should push the task event off so the child should succeed */
 69         FAIL_IF(wait_for_child(pid));
 70         FAIL_IF(event_disable(&event));
 71         FAIL_IF(event_read(&event));
 72 
 73         event_report(&event);
 74 
 75         /* The task event may have run, or not so we can't assert anything about it */
 76 
 77         return 0;
 78 }
 79 
 80 int main(void)
 81 {
 82         return test_harness(task_event_vs_ebb, "task_event_vs_ebb");
 83 }
 84 

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