LXR linux/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2

   1/*
   2 * Copyright 2014, Michael Ellerman, IBM Corp.
   3 * Licensed under GPLv2.
   4 */
   5
   6#include <stdio.h>
   7#include <stdlib.h>
   8#include <stdbool.h>
   9
  10#include "ebb.h"
  11
  12
  13/*
  14 * Test of counting cycles while manipulating the user accessible bits in MMCR2.
  15 */
  16
  17/* We use two values because the first freezes PMC1 and so we would get no EBBs */
  18#define MMCR2_EXPECTED_1 0x4020100804020000UL /* (FC1P|FC2P|FC3P|FC4P|FC5P|FC6P) */
  19#define MMCR2_EXPECTED_2 0x0020100804020000UL /* (     FC2P|FC3P|FC4P|FC5P|FC6P) */
  20
  21
  22int cycles_with_mmcr2(void)
  23{
  24        struct event event;
  25        uint64_t val, expected[2], actual;
  26        int i;
  27        bool bad_mmcr2;
  28
  29        SKIP_IF(!ebb_is_supported());
  30
  31        event_init_named(&event, 0x1001e, "cycles");
  32        event_leader_ebb_init(&event);
  33
  34        event.attr.exclude_kernel = 1;
  35        event.attr.exclude_hv = 1;
  36        event.attr.exclude_idle = 1;
  37
  38        FAIL_IF(event_open(&event));
  39
  40        ebb_enable_pmc_counting(1);
  41        setup_ebb_handler(standard_ebb_callee);
  42        ebb_global_enable();
  43
  44        FAIL_IF(ebb_event_enable(&event));
  45
  46        mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
  47
  48        /* XXX Set of MMCR2 must be after enable */
  49        expected[0] = MMCR2_EXPECTED_1;
  50        expected[1] = MMCR2_EXPECTED_2;
  51        i = 0;
  52        bad_mmcr2 = false;
  53
  54        /* Make sure we loop until we take at least one EBB */
  55        while ((ebb_state.stats.ebb_count < 20 && !bad_mmcr2) ||
  56                ebb_state.stats.ebb_count < 1)
  57        {
  58                mtspr(SPRN_MMCR2, expected[i % 2]);
  59
  60                FAIL_IF(core_busy_loop());
  61
  62                val = mfspr(SPRN_MMCR2);
  63                if (val != expected[i % 2]) {
  64                        bad_mmcr2 = true;
  65                        actual = val;
  66                }
  67
  68                i++;
  69        }
  70
  71        ebb_global_disable();
  72        ebb_freeze_pmcs();
  73
  74        count_pmc(1, sample_period);
  75
  76        dump_ebb_state();
  77
  78        event_close(&event);
  79
  80        FAIL_IF(ebb_state.stats.ebb_count == 0);
  81
  82        if (bad_mmcr2)
  83                printf("Bad MMCR2 value seen is 0x%lx\n", actual);
  84
  85        FAIL_IF(bad_mmcr2);
  86
  87        return 0;
  88}
  89
  90int main(void)
  91{
  92        return test_harness(cycles_with_mmcr2, "cycles_with_mmcr2");
  93}
  94