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
13#define MALLOC_SIZE (0x10000 * 10) /* Ought to be enough .. */
14
15/* The data cache was reloaded from local core's L3 due to a demand load */
16#define EventCode 0x21c040
17
18/*
19 * A perf sampling test for mmcr1
20 * fields : pmcxsel, unit, cache.
21 */
22static int mmcr1_sel_unit_cache(void)
23{
24 struct event event;
25 u64 *intr_regs;
26 char *p;
27 int i;
28
29 /* Check for platform support for the test */
30 SKIP_IF(check_pvr_for_sampling_tests());
31
32 p = malloc(MALLOC_SIZE);
33 FAIL_IF(!p);
34
35 /* Init the event for the sampling test */
36 event_init_sampling(e: &event, EventCode);
37 event.attr.sample_regs_intr = platform_extended_mask;
38 event.attr.sample_period = 1;
39 FAIL_IF(event_open(e: &event));
40 event.mmap_buffer = event_sample_buf_mmap(fd: event.fd, mmap_pages: 1);
41
42 event_enable(e: &event);
43
44 /* workload to make the event overflow */
45 for (i = 0; i < MALLOC_SIZE; i += 0x10000)
46 p[i] = i;
47
48 event_disable(e: &event);
49
50 /* Check for sample count */
51 FAIL_IF(!collect_samples(sample_buff: event.mmap_buffer));
52
53 intr_regs = get_intr_regs(event: &event, sample_buff: event.mmap_buffer);
54
55 /* Check for intr_regs */
56 FAIL_IF(!intr_regs);
57
58 /*
59 * Verify that pmcxsel, unit and cache field of MMCR1
60 * match with corresponding event code fields
61 */
62 FAIL_IF(EV_CODE_EXTRACT(event.attr.config, pmcxsel) !=
63 get_mmcr1_pmcxsel(mmcr1: get_reg_value(intr_regs, register_name: "MMCR1"), pmc: 1));
64 FAIL_IF(EV_CODE_EXTRACT(event.attr.config, unit) !=
65 get_mmcr1_unit(mmcr1: get_reg_value(intr_regs, register_name: "MMCR1"), pmc: 1));
66 FAIL_IF(EV_CODE_EXTRACT(event.attr.config, cache) !=
67 get_mmcr1_cache(mmcr1: get_reg_value(intr_regs, register_name: "MMCR1"), pmc: 1));
68
69 free(p);
70 event_close(e: &event);
71 return 0;
72}
73
74int main(void)
75{
76 FAIL_IF(test_harness(mmcr1_sel_unit_cache, "mmcr1_sel_unit_cache"));
77}
78

source code of linux/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr1_sel_unit_cache_test.c