mmcr0_fc56_pmc56_test.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright 2022, Athira Rajeev, 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/*
16 * A perf sampling test for mmcr0
17 * fields: fc56_pmc56
18 */
19static int mmcr0_fc56_pmc56(void)
20{
21	struct event event;
22	u64 *intr_regs;
23
24	 /* Check for platform support for the test */
25	SKIP_IF(check_pvr_for_sampling_tests());
26
27	/* Init the event for the sampling test */
28	event_init_sampling(&event, 0x500fa);
29	event.attr.sample_regs_intr = platform_extended_mask;
30	FAIL_IF(event_open(&event));
31	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
32
33	FAIL_IF(event_enable(&event));
34
35	/* workload to make the event overflow */
36	thirty_two_instruction_loop(10000);
37
38	FAIL_IF(event_disable(&event));
39
40	/* Check for sample count */
41	FAIL_IF(!collect_samples(event.mmap_buffer));
42
43	intr_regs = get_intr_regs(&event, event.mmap_buffer);
44
45	/* Check for intr_regs */
46	FAIL_IF(!intr_regs);
47
48	/* Verify that fc56 is not set in MMCR0 when using PMC5 */
49	FAIL_IF(get_mmcr0_fc56(get_reg_value(intr_regs, "MMCR0"), 5));
50
51	event_close(&event);
52	return 0;
53}
54
55int main(void)
56{
57	return test_harness(mmcr0_fc56_pmc56, "mmcr0_fc56_pmc56");
58}