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 
19 static int sysfs__fprintf_build_id(FILE *fp)
20 {
21 	u8 kallsyms_build_id[BUILD_ID_SIZE];
22 	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
23 
24 	if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
25 				 sizeof(kallsyms_build_id)) != 0)
26 		return -1;
27 
28 	build_id__sprintf(kallsyms_build_id, sizeof(kallsyms_build_id),
29 			  sbuild_id);
30 	fprintf(fp, "%s\n", sbuild_id);
31 	return 0;
32 }
33 
34 static int filename__fprintf_build_id(const char *name, FILE *fp)
35 {
36 	u8 build_id[BUILD_ID_SIZE];
37 	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
38 
39 	if (filename__read_build_id(name, build_id,
40 				    sizeof(build_id)) != sizeof(build_id))
41 		return 0;
42 
43 	build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
44 	return fprintf(fp, "%s\n", sbuild_id);
45 }
46 
47 static bool dso__skip_buildid(struct dso *dso, int with_hits)
48 {
49 	return with_hits && !dso->hit;
50 }
51 
52 static int perf_session__list_build_ids(bool force, bool with_hits)
53 {
54 	struct perf_session *session;
55 
56 	symbol__elf_init();
57 	/*
58 	 * See if this is an ELF file first:
59 	 */
60 	if (filename__fprintf_build_id(input_name, stdout))
61 		goto out;
62 
63 	session = perf_session__new(input_name, O_RDONLY, force, false,
64 				    &build_id__mark_dso_hit_ops);
65 	if (session == NULL)
66 		return -1;
67 	/*
68 	 * in pipe-mode, the only way to get the buildids is to parse
69 	 * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
70 	 */
71 	if (with_hits || session->fd_pipe)
72 		perf_session__process_events(session, &build_id__mark_dso_hit_ops);
73 
74 	perf_session__fprintf_dsos_buildid(session, stdout, dso__skip_buildid, with_hits);
75 	perf_session__delete(session);
76 out:
77 	return 0;
78 }
79 
80 int cmd_buildid_list(int argc, const char **argv,
81 		     const char *prefix __maybe_unused)
82 {
83 	bool show_kernel = false;
84 	bool with_hits = false;
85 	bool force = false;
86 	const struct option options[] = {
87 	OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
88 	OPT_STRING('i', "input", &input_name, "file", "input file name"),
89 	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
90 	OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
91 	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
92 	OPT_END()
93 	};
94 	const char * const buildid_list_usage[] = {
95 		"perf buildid-list [<options>]",
96 		NULL
97 	};
98 
99 	argc = parse_options(argc, argv, options, buildid_list_usage, 0);
100 	setup_pager();
101 
102 	if (show_kernel)
103 		return sysfs__fprintf_build_id(stdout);
104 
105 	return perf_session__list_build_ids(force, with_hits);
106 }
107