1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2022, Madhavan Srinivasan, IBM Corp.
4 */
5
6#include <signal.h>
7#include <stdio.h>
8#include <stdlib.h>
9#include <sys/types.h>
10
11#include "../event.h"
12#include "misc.h"
13#include "utils.h"
14
15extern void thirty_two_instruction_loop(int loops);
16
17static bool is_hv;
18
19static void sig_usr2_handler(int signum, siginfo_t *info, void *data)
20{
21	ucontext_t *uctx = data;
22
23	is_hv = !!(uctx->uc_mcontext.gp_regs[PT_MSR] & MSR_HV);
24}
25
26/*
27 * A perf sampling test for mmcr2
28 * fields : fcs, fch.
29 */
30static int mmcr2_fcs_fch(void)
31{
32	struct sigaction sigact = {
33		.sa_sigaction = sig_usr2_handler,
34		.sa_flags = SA_SIGINFO
35	};
36	struct event event;
37	u64 *intr_regs;
38
39	FAIL_IF(sigaction(SIGUSR2, &sigact, NULL));
40	FAIL_IF(kill(getpid(), SIGUSR2));
41
42	/* Check for platform support for the test */
43	SKIP_IF(check_pvr_for_sampling_tests());
44
45	/* Init the event for the sampling test */
46	event_init_sampling(&event, 0x1001e);
47	event.attr.sample_regs_intr = platform_extended_mask;
48	event.attr.exclude_kernel = 1;
49	FAIL_IF(event_open(&event));
50	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
51
52	FAIL_IF(event_enable(&event));
53
54	/* workload to make the event overflow */
55	thirty_two_instruction_loop(10000);
56
57	FAIL_IF(event_disable(&event));
58
59	/* Check for sample count */
60	FAIL_IF(!collect_samples(event.mmap_buffer));
61
62	intr_regs = get_intr_regs(&event, event.mmap_buffer);
63
64	/* Check for intr_regs */
65	FAIL_IF(!intr_regs);
66
67	/*
68	 * Verify that fcs and fch field of MMCR2 match
69	 * with corresponding modifier fields.
70	 */
71	if (is_hv)
72		FAIL_IF(event.attr.exclude_kernel !=
73			get_mmcr2_fch(get_reg_value(intr_regs, "MMCR2"), 1));
74	else
75		FAIL_IF(event.attr.exclude_kernel !=
76			get_mmcr2_fcs(get_reg_value(intr_regs, "MMCR2"), 1));
77
78	event_close(&event);
79	return 0;
80}
81
82int main(void)
83{
84	return test_harness(mmcr2_fcs_fch, "mmcr2_fcs_fch");
85}
86