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