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 
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 
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  */
118 int test__x86_sample_parsing(struct test *test __maybe_unused, int subtest __maybe_unused)
119 {
120 	return do_test(PERF_SAMPLE_WEIGHT_STRUCT);
121 }
122