kernel/tools/testing/selftests/powerpc/pmu/ebb/cycles_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
   9 #include "ebb.h"
  10
  11
  12 /*
  13  * Basic test that counts user cycles and takes EBBs.
  14  */
  15 int cycles(void)
  16 {
  17         struct event event;
  18
  19         SKIP_IF(!ebb_is_supported());
  20
  21         event_init_named(&event, 0x1001e, "cycles");
  22         event_leader_ebb_init(&event);
  23
  24         event.attr.exclude_kernel = 1;
  25         event.attr.exclude_hv = 1;
  26         event.attr.exclude_idle = 1;
  27
  28         FAIL_IF(event_open(&event));
  29
  30         ebb_enable_pmc_counting(1);
  31         setup_ebb_handler(standard_ebb_callee);
  32         ebb_global_enable();
  33         FAIL_IF(ebb_event_enable(&event));
  34
  35         mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
  36
  37         while (ebb_state.stats.ebb_count < 10) {
  38                 FAIL_IF(core_busy_loop());
  39                 FAIL_IF(ebb_check_mmcr0());
  40         }
  41
  42         ebb_global_disable();
  43         ebb_freeze_pmcs();
  44
  45         count_pmc(1, sample_period);
  46
  47         dump_ebb_state();
  48
  49         event_close(&event);
  50
  51         FAIL_IF(ebb_state.stats.ebb_count == 0);
  52         FAIL_IF(!ebb_check_count(1, sample_period, 100));
  53
  54         return 0;
  55 }
  56
  57 int main(void)
  58 {
  59         return test_harness(cycles, "cycles");
  60 }