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_with_ll_sc(u64 loops, u64 *ll_sc_target);
14
15/* The data cache was reloaded from local core's L3 due to a demand load */
16#define EventCode 0x1340000001c040
17
18/*
19 * A perf sampling test for mmcr3
20 * fields.
21 */
22static int mmcr3_src(void)
23{
24 struct event event;
25 u64 *intr_regs;
26 u64 dummy;
27
28 /* Check for platform support for the test */
29 SKIP_IF(check_pvr_for_sampling_tests());
30 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1));
31
32 /* Init the event for the sampling test */
33 event_init_sampling(e: &event, EventCode);
34 event.attr.sample_regs_intr = platform_extended_mask;
35 FAIL_IF(event_open(e: &event));
36 event.mmap_buffer = event_sample_buf_mmap(fd: event.fd, mmap_pages: 1);
37
38 FAIL_IF(event_enable(e: &event));
39
40 /* workload to make event overflow */
41 thirty_two_instruction_loop_with_ll_sc(loops: 1000000, ll_sc_target: &dummy);
42
43 FAIL_IF(event_disable(e: &event));
44
45 /* Check for sample count */
46 FAIL_IF(!collect_samples(sample_buff: event.mmap_buffer));
47
48 intr_regs = get_intr_regs(event: &event, sample_buff: event.mmap_buffer);
49
50 /* Check for intr_regs */
51 FAIL_IF(!intr_regs);
52
53 /*
54 * Verify that src field of MMCR3 match with
55 * corresponding event code field
56 */
57 FAIL_IF(EV_CODE_EXTRACT(event.attr.config, mmcr3_src) !=
58 get_mmcr3_src(mmcr3: get_reg_value(intr_regs, register_name: "MMCR3"), pmc: 1));
59
60 event_close(e: &event);
61 return 0;
62}
63
64int main(void)
65{
66 return test_harness(mmcr3_src, "mmcr3_src");
67}
68

source code of linux/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr3_src_test.c