93 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright 2014, Michael Ellerman, IBM Corp.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 actual = 0;54 55 /* Make sure we loop until we take at least one EBB */56 while ((ebb_state.stats.ebb_count < 20 && !bad_mmcr2) ||57 ebb_state.stats.ebb_count < 1)58 {59 mtspr(SPRN_MMCR2, expected[i % 2]);60 61 FAIL_IF(core_busy_loop());62 63 val = mfspr(SPRN_MMCR2);64 if (val != expected[i % 2]) {65 bad_mmcr2 = true;66 actual = val;67 }68 69 i++;70 }71 72 ebb_global_disable();73 ebb_freeze_pmcs();74 75 dump_ebb_state();76 77 event_close(&event);78 79 FAIL_IF(ebb_state.stats.ebb_count == 0);80 81 if (bad_mmcr2)82 printf("Bad MMCR2 value seen is 0x%lx\n", actual);83 84 FAIL_IF(bad_mmcr2);85 86 return 0;87}88 89int main(void)90{91 return test_harness(cycles_with_mmcr2, "cycles_with_mmcr2");92}93