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 indirect_branch_loop(void);
14
15/* Instructions */
16#define EventCode 0x500fa
17
18/* ifm field for indirect branch mode */
19#define IFM_IND_BRANCH 0x2
20
21/*
22 * A perf sampling test for mmcra
23 * field: ifm for bhrb ind_call.
24 */
25static int mmcra_bhrb_ind_call_test(void)
26{
27	struct event event;
28	u64 *intr_regs;
29
30	/*
31	 * Check for platform support for the test.
32	 * This test is only aplicable on power10
33	 */
34	SKIP_IF(check_pvr_for_sampling_tests());
35	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1));
36
37	 /* Init the event for the sampling test */
38	event_init_sampling(&event, EventCode);
39	event.attr.sample_regs_intr = platform_extended_mask;
40	event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
41	event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_IND_CALL;
42	event.attr.exclude_kernel = 1;
43
44	FAIL_IF(event_open(&event));
45	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
46
47	FAIL_IF(event_enable(&event));
48
49	/* workload to make the event overflow */
50	indirect_branch_loop();
51
52	FAIL_IF(event_disable(&event));
53
54	intr_regs = get_intr_regs(&event, event.mmap_buffer);
55
56	/* Check for intr_regs */
57	FAIL_IF(!intr_regs);
58
59	/* Verify that ifm bit is set properly in MMCRA */
60	FAIL_IF(get_mmcra_ifm(get_reg_value(intr_regs, "MMCRA"), 5) != IFM_IND_BRANCH);
61
62	event_close(&event);
63	return 0;
64}
65
66int main(void)
67{
68	return test_harness(mmcra_bhrb_ind_call_test, "mmcra_bhrb_ind_call_test");
69}
70