1// SPDX-License-Identifier: GPL-2.0-only
2#include <stdbool.h>
3#include <inttypes.h>
4#include <stdlib.h>
5#include <string.h>
6#include <linux/bitops.h>
7#include <linux/kernel.h>
8#include <linux/types.h>
9
10#include "event.h"
11#include "evsel.h"
12#include "debug.h"
13#include "util/sample.h"
14#include "util/synthetic-events.h"
15
16#include "tests/tests.h"
17#include "arch-tests.h"
18
19#define COMP(m) do {					\
20	if (s1->m != s2->m) {				\
21		pr_debug("Samples differ at '"#m"'\n");	\
22		return false;				\
23	}						\
24} while (0)
25
26static bool samples_same(const struct perf_sample *s1,
27			 const struct perf_sample *s2,
28			 u64 type)
29{
30	if (type & PERF_SAMPLE_WEIGHT_STRUCT) {
31		COMP(ins_lat);
32		COMP(retire_lat);
33	}
34
35	return true;
36}
37
38static int do_test(u64 sample_type)
39{
40	struct evsel evsel = {
41		.needs_swap = false,
42		.core = {
43			. attr = {
44				.sample_type = sample_type,
45				.read_format = 0,
46			},
47		},
48	};
49	union perf_event *event;
50	struct perf_sample sample = {
51		.weight		= 101,
52		.ins_lat        = 102,
53		.retire_lat     = 103,
54	};
55	struct perf_sample sample_out;
56	size_t i, sz, bufsz;
57	int err, ret = -1;
58
59	sz = perf_event__sample_event_size(&sample, sample_type, 0);
60	bufsz = sz + 4096; /* Add a bit for overrun checking */
61	event = malloc(bufsz);
62	if (!event) {
63		pr_debug("malloc failed\n");
64		return -1;
65	}
66
67	memset(event, 0xff, bufsz);
68	event->header.type = PERF_RECORD_SAMPLE;
69	event->header.misc = 0;
70	event->header.size = sz;
71
72	err = perf_event__synthesize_sample(event, sample_type, 0, &sample);
73	if (err) {
74		pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
75			 "perf_event__synthesize_sample", sample_type, err);
76		goto out_free;
77	}
78
79	/* The data does not contain 0xff so we use that to check the size */
80	for (i = bufsz; i > 0; i--) {
81		if (*(i - 1 + (u8 *)event) != 0xff)
82			break;
83	}
84	if (i != sz) {
85		pr_debug("Event size mismatch: actual %zu vs expected %zu\n",
86			 i, sz);
87		goto out_free;
88	}
89
90	evsel.sample_size = __evsel__sample_size(sample_type);
91
92	err = evsel__parse_sample(&evsel, event, &sample_out);
93	if (err) {
94		pr_debug("%s failed for sample_type %#"PRIx64", error %d\n",
95			 "evsel__parse_sample", sample_type, err);
96		goto out_free;
97	}
98
99	if (!samples_same(&sample, &sample_out, sample_type)) {
100		pr_debug("parsing failed for sample_type %#"PRIx64"\n",
101			 sample_type);
102		goto out_free;
103	}
104
105	ret = 0;
106out_free:
107	free(event);
108
109	return ret;
110}
111
112/**
113 * test__x86_sample_parsing - test X86 specific sample parsing
114 *
115 * This function implements a test that synthesizes a sample event, parses it
116 * and then checks that the parsed sample matches the original sample. If the
117 * test passes %0 is returned, otherwise %-1 is returned.
118 *
119 * For now, the PERF_SAMPLE_WEIGHT_STRUCT is the only X86 specific sample type.
120 * The test only checks the PERF_SAMPLE_WEIGHT_STRUCT type.
121 */
122int test__x86_sample_parsing(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
123{
124	return do_test(PERF_SAMPLE_WEIGHT_STRUCT);
125}
126