tools/testing/selftests/powerpc/pmu/ebb/no_handler_test.c

   1 /*
   2  * Copyright 2014, Michael Ellerman, IBM Corp.
   3  * Licensed under GPLv2.
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <setjmp.h>
   9 #include <signal.h>
  10
  11 #include "ebb.h"
  12
  13
  14 /* Test that things work sanely if we have no handler */
  15
  16 static int no_handler_test(void)
  17 {
  18         struct event event;
  19         u64 val;
  20         int i;
  21
  22         SKIP_IF(!ebb_is_supported());
  23
  24         event_init_named(&event, 0x1001e, "cycles");
  25         event_leader_ebb_init(&event);
  26
  27         event.attr.exclude_kernel = 1;
  28         event.attr.exclude_hv = 1;
  29         event.attr.exclude_idle = 1;
  30
  31         FAIL_IF(event_open(&event));
  32         FAIL_IF(ebb_event_enable(&event));
  33
  34         val = mfspr(SPRN_EBBHR);
  35         FAIL_IF(val != 0);
  36
  37         /* Make sure it overflows quickly */
  38         sample_period = 1000;
  39         mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
  40
  41         /* Spin to make sure the event has time to overflow */
  42         for (i = 0; i < 1000; i++)
  43                 mb();
  44
  45         dump_ebb_state();
  46
  47         /* We expect to see the PMU frozen & PMAO set */
  48         val = mfspr(SPRN_MMCR0);
  49         FAIL_IF(val != 0x0000000080000080);
  50
  51         event_close(&event);
  52
  53         dump_ebb_state();
  54
  55         /* The real test is that we never took an EBB at 0x0 */
  56
  57         return 0;
  58 }
  59
  60 int main(void)
  61 {
  62         return test_harness(no_handler_test,"no_handler_test");
  63 }