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