1 /*
2  * builtin-buildid-list.c
3  *
4  * Builtin buildid-list command: list buildids in perf.data, in the running
5  * kernel and in ELF files.
6  *
7  * Copyright (C) 2009, Red Hat Inc.
8  * Copyright (C) 2009, Arnaldo Carvalho de Melo <acme@redhat.com>
9  */
10 #include "builtin.h"
11 #include "perf.h"
12 #include "util/build-id.h"
13 #include "util/cache.h"
14 #include "util/debug.h"
15 #include "util/parse-options.h"
16 #include "util/session.h"
17 #include "util/symbol.h"
18 #include "util/data.h"
19 
20 static int sysfs__fprintf_build_id(FILE *fp)
21 {
22 	u8 kallsyms_build_id[BUILD_ID_SIZE];
23 	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
24 
25 	if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
26 				 sizeof(kallsyms_build_id)) != 0)
27 		return -1;
28 
29 	build_id__sprintf(kallsyms_build_id, sizeof(kallsyms_build_id),
30 			  sbuild_id);
31 	fprintf(fp, "%s\n", sbuild_id);
32 	return 0;
33 }
34 
35 static int filename__fprintf_build_id(const char *name, FILE *fp)
36 {
37 	u8 build_id[BUILD_ID_SIZE];
38 	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
39 
40 	if (filename__read_build_id(name, build_id,
41 				    sizeof(build_id)) != sizeof(build_id))
42 		return 0;
43 
44 	build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
45 	return fprintf(fp, "%s\n", sbuild_id);
46 }
47 
48 static bool dso__skip_buildid(struct dso *dso, int with_hits)
49 {
50 	return with_hits && !dso->hit;
51 }
52 
53 static int perf_session__list_build_ids(bool force, bool with_hits)
54 {
55 	struct perf_session *session;
56 	struct perf_data_file file = {
57 		.path  = input_name,
58 		.mode  = PERF_DATA_MODE_READ,
59 		.force = force,
60 	};
61 
62 	symbol__elf_init();
63 	/*
64 	 * See if this is an ELF file first:
65 	 */
66 	if (filename__fprintf_build_id(input_name, stdout))
67 		goto out;
68 
69 	session = perf_session__new(&file, false, &build_id__mark_dso_hit_ops);
70 	if (session == NULL)
71 		return -1;
72 
73 	/*
74 	 * We take all buildids when the file contains AUX area tracing data
75 	 * because we do not decode the trace because it would take too long.
76 	 */
77 	if (!perf_data_file__is_pipe(&file) &&
78 	    perf_header__has_feat(&session->header, HEADER_AUXTRACE))
79 		with_hits = false;
80 
81 	/*
82 	 * in pipe-mode, the only way to get the buildids is to parse
83 	 * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
84 	 */
85 	if (with_hits || perf_data_file__is_pipe(&file))
86 		perf_session__process_events(session);
87 
88 	perf_session__fprintf_dsos_buildid(session, stdout, dso__skip_buildid, with_hits);
89 	perf_session__delete(session);
90 out:
91 	return 0;
92 }
93 
94 int cmd_buildid_list(int argc, const char **argv,
95 		     const char *prefix __maybe_unused)
96 {
97 	bool show_kernel = false;
98 	bool with_hits = false;
99 	bool force = false;
100 	const struct option options[] = {
101 	OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
102 	OPT_STRING('i', "input", &input_name, "file", "input file name"),
103 	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
104 	OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
105 	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
106 	OPT_END()
107 	};
108 	const char * const buildid_list_usage[] = {
109 		"perf buildid-list [<options>]",
110 		NULL
111 	};
112 
113 	argc = parse_options(argc, argv, options, buildid_list_usage, 0);
114 	setup_pager();
115 
116 	if (show_kernel)
117 		return sysfs__fprintf_build_id(stdout);
118 
119 	return perf_session__list_build_ids(force, with_hits);
120 }
121