mmcra_bhrb_any_test.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright 2022, Kajol Jain, IBM Corp.
 4 */
 5
 6#include <stdio.h>
 7#include <stdlib.h>
 8
 9#include "../event.h"
10#include "misc.h"
11#include "utils.h"
12
13extern void thirty_two_instruction_loop(int loops);
14
15/* Instructions */
16#define EventCode 0x500fa
17
18/* ifm field for any branch mode */
19#define IFM_ANY_BRANCH 0x0
20
21/*
22 * A perf sampling test for mmcra
23 * field: ifm for bhrb any call.
24 */
25static int mmcra_bhrb_any_test(void)
26{
27	struct event event;
28	u64 *intr_regs;
29
30	/* Check for platform support for the test */
31	SKIP_IF(check_pvr_for_sampling_tests());
32
33	 /* Init the event for the sampling test */
34	event_init_sampling(&event, EventCode);
35	event.attr.sample_regs_intr = platform_extended_mask;
36	event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
37	event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_ANY;
38	event.attr.exclude_kernel = 1;
39
40	FAIL_IF(event_open(&event));
41	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
42
43	FAIL_IF(event_enable(&event));
44
45	/* workload to make the event overflow */
46	thirty_two_instruction_loop(10000);
47
48	FAIL_IF(event_disable(&event));
49
50	intr_regs = get_intr_regs(&event, event.mmap_buffer);
51
52	/* Check for intr_regs */
53	FAIL_IF(!intr_regs);
54
55	/* Verify that ifm bit is set properly in MMCRA */
56	FAIL_IF(get_mmcra_ifm(get_reg_value(intr_regs, "MMCRA"), 5) != IFM_ANY_BRANCH);
57
58	event_close(&event);
59	return 0;
60}
61
62int main(void)
63{
64	return test_harness(mmcra_bhrb_any_test, "mmcra_bhrb_any_test");
65}