tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 "util/build-id.h"
12#include "util/debug.h"
13#include "util/dso.h"
14#include "util/map.h"
15#include <subcmd/pager.h>
16#include <subcmd/parse-options.h>
17#include "util/session.h"
18#include "util/symbol.h"
19#include "util/data.h"
20#include "util/util.h"
21#include <errno.h>
22#include <inttypes.h>
23#include <linux/err.h>
24
25static int buildid__map_cb(struct map *map, void *arg __maybe_unused)
26{
27 const struct dso *dso = map__dso(map);
28 char bid_buf[SBUILD_ID_SIZE];
29 const char *dso_long_name = dso__long_name(dso);
30 const char *dso_short_name = dso__short_name(dso);
31
32 memset(bid_buf, 0, sizeof(bid_buf));
33 if (dso__has_build_id(dso))
34 build_id__sprintf(dso__bid_const(dso), bid_buf);
35 printf("%s %16" PRIx64 " %16" PRIx64, bid_buf, map__start(map), map__end(map));
36 if (dso_long_name != NULL)
37 printf(" %s", dso_long_name);
38 else if (dso_short_name != NULL)
39 printf(" %s", dso_short_name);
40
41 printf("\n");
42
43 return 0;
44}
45
46static void buildid__show_kernel_maps(void)
47{
48 struct machine *machine;
49
50 machine = machine__new_host();
51 machine__for_each_kernel_map(machine, buildid__map_cb, NULL);
52 machine__delete(machine);
53}
54
55static int sysfs__fprintf_build_id(FILE *fp)
56{
57 char sbuild_id[SBUILD_ID_SIZE];
58 int ret;
59
60 ret = sysfs__sprintf_build_id("/", sbuild_id);
61 if (ret != sizeof(sbuild_id))
62 return ret < 0 ? ret : -EINVAL;
63
64 return fprintf(fp, "%s\n", sbuild_id);
65}
66
67static int filename__fprintf_build_id(const char *name, FILE *fp)
68{
69 char sbuild_id[SBUILD_ID_SIZE];
70 int ret;
71
72 ret = filename__sprintf_build_id(name, sbuild_id);
73 if (ret != sizeof(sbuild_id))
74 return ret < 0 ? ret : -EINVAL;
75
76 return fprintf(fp, "%s\n", sbuild_id);
77}
78
79static bool dso__skip_buildid(struct dso *dso, int with_hits)
80{
81 return with_hits && !dso__hit(dso);
82}
83
84static int perf_session__list_build_ids(bool force, bool with_hits)
85{
86 struct perf_session *session;
87 struct perf_data data = {
88 .path = input_name,
89 .mode = PERF_DATA_MODE_READ,
90 .force = force,
91 };
92
93 symbol__elf_init();
94 /*
95 * See if this is an ELF file first:
96 */
97 if (filename__fprintf_build_id(input_name, stdout) > 0)
98 goto out;
99
100 session = perf_session__new(&data, &build_id__mark_dso_hit_ops);
101 if (IS_ERR(session))
102 return PTR_ERR(session);
103
104 /*
105 * We take all buildids when the file contains AUX area tracing data
106 * because we do not decode the trace because it would take too long.
107 */
108 if (!perf_data__is_pipe(&data) &&
109 perf_header__has_feat(&session->header, HEADER_AUXTRACE))
110 with_hits = false;
111
112 if (!perf_header__has_feat(&session->header, HEADER_BUILD_ID))
113 with_hits = true;
114
115 if (zstd_init(&(session->zstd_data), 0) < 0)
116 pr_warning("Decompression initialization failed. Reported data may be incomplete.\n");
117
118 /*
119 * in pipe-mode, the only way to get the buildids is to parse
120 * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
121 */
122 if (with_hits || perf_data__is_pipe(&data))
123 perf_session__process_events(session);
124
125 perf_session__fprintf_dsos_buildid(session, stdout, dso__skip_buildid, with_hits);
126 perf_session__delete(session);
127out:
128 return 0;
129}
130
131int cmd_buildid_list(int argc, const char **argv)
132{
133 bool show_kernel = false;
134 bool show_kernel_maps = false;
135 bool with_hits = false;
136 bool force = false;
137 const struct option options[] = {
138 OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
139 OPT_STRING('i', "input", &input_name, "file", "input file name"),
140 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
141 OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
142 OPT_BOOLEAN('m', "kernel-maps", &show_kernel_maps,
143 "Show build id of current kernel + modules"),
144 OPT_INCR('v', "verbose", &verbose, "be more verbose"),
145 OPT_END()
146 };
147 const char * const buildid_list_usage[] = {
148 "perf buildid-list [<options>]",
149 NULL
150 };
151
152 argc = parse_options(argc, argv, options, buildid_list_usage, 0);
153 setup_pager();
154
155 if (show_kernel) {
156 return !(sysfs__fprintf_build_id(stdout) > 0);
157 } else if (show_kernel_maps) {
158 buildid__show_kernel_maps();
159 return 0;
160 }
161
162 return perf_session__list_build_ids(force, with_hits);
163}