pmu/ebb/cycles_test.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright 2014, Michael Ellerman, IBM Corp.
0004  */
0005
0006 #include <stdio.h>
0007 #include <stdlib.h>
0008
0009 #include "ebb.h"
0010
0011
0012 /*
0013  * Basic test that counts user cycles and takes EBBs.
0014  */
0015 int cycles(void)
0016 {
0017     struct event event;
0018
0019     SKIP_IF(!ebb_is_supported());
0020
0021     event_init_named(&event, 0x1001e, "cycles");
0022     event_leader_ebb_init(&event);
0023
0024     event.attr.exclude_kernel = 1;
0025     event.attr.exclude_hv = 1;
0026     event.attr.exclude_idle = 1;
0027
0028     FAIL_IF(event_open(&event));
0029
0030     ebb_enable_pmc_counting(1);
0031     setup_ebb_handler(standard_ebb_callee);
0032     ebb_global_enable();
0033     FAIL_IF(ebb_event_enable(&event));
0034
0035     mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
0036
0037     while (ebb_state.stats.ebb_count < 10) {
0038         FAIL_IF(core_busy_loop());
0039         FAIL_IF(ebb_check_mmcr0());
0040     }
0041
0042     ebb_global_disable();
0043     ebb_freeze_pmcs();
0044
0045     dump_ebb_state();
0046
0047     event_close(&event);
0048
0049     FAIL_IF(ebb_state.stats.ebb_count == 0);
0050     FAIL_IF(!ebb_check_count(1, sample_period, 100));
0051
0052     return 0;
0053 }
0054
0055 int main(void)
0056 {
0057     return test_harness(cycles, "cycles");
0058 }