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
26 static 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
38 static 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;
106 out_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 */
122 int 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
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