mmcra_thresh_cmp_test.c

 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
13/*
14 * Primary PMU event used here is PM_MRK_INST_CMPL (0x401e0)
15 * Threshold event selection used is issue to complete for cycles
16 * Sampling criteria is Load only sampling
17 */
18#define p9_EventCode 0x13E35340401e0
19#define p10_EventCode 0x35340401e0
20
21extern void thirty_two_instruction_loop_with_ll_sc(u64 loops, u64 *ll_sc_target);
22
23/* A perf sampling test to test mmcra fields */
24static int mmcra_thresh_cmp(void)
25{
26	struct event event;
27	u64 *intr_regs;
28	u64 dummy;
29
30	/* Check for platform support for the test */
31	SKIP_IF(check_pvr_for_sampling_tests());
32
33	/* Skip for comapt mode */
34	SKIP_IF(check_for_compat_mode());
35
36	/* Init the event for the sampling test */
37	if (!have_hwcap2(PPC_FEATURE2_ARCH_3_1)) {
38		event_init_sampling(&event, p9_EventCode);
39	} else {
40		event_init_sampling(&event, p10_EventCode);
41		event.attr.config1 = 1000;
42	}
43
44	event.attr.sample_regs_intr = platform_extended_mask;
45	FAIL_IF(event_open(&event));
46	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
47
48	FAIL_IF(event_enable(&event));
49
50	/* workload to make the event overflow */
51	thirty_two_instruction_loop_with_ll_sc(1000000, &dummy);
52
53	FAIL_IF(event_disable(&event));
54
55	/* Check for sample count */
56	FAIL_IF(!collect_samples(event.mmap_buffer));
57
58	intr_regs = get_intr_regs(&event, event.mmap_buffer);
59
60	/* Check for intr_regs */
61	FAIL_IF(!intr_regs);
62
63	/* Verify that thresh cmp match with the corresponding event code fields */
64	FAIL_IF(get_thresh_cmp_val(event) !=
65			get_mmcra_thd_cmp(get_reg_value(intr_regs, "MMCRA"), 4));
66
67	event_close(&event);
68	return 0;
69}
70
71int main(void)
72{
73	FAIL_IF(test_harness(mmcra_thresh_cmp, "mmcra_thresh_cmp"));
74}