linux/tools/perf/builtin-buildid-list.c
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   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#include <libelf.h>
  20
  21static const char *input_name;
  22static bool force;
  23static bool show_kernel;
  24static bool with_hits;
  25
  26static const char * const buildid_list_usage[] = {
  27        "perf buildid-list [<options>]",
  28        NULL
  29};
  30
  31static const struct option options[] = {
  32        OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
  33        OPT_STRING('i', "input", &input_name, "file",
  34                    "input file name"),
  35        OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
  36        OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
  37        OPT_INCR('v', "verbose", &verbose,
  38                    "be more verbose"),
  39        OPT_END()
  40};
  41
  42static int sysfs__fprintf_build_id(FILE *fp)
  43{
  44        u8 kallsyms_build_id[BUILD_ID_SIZE];
  45        char sbuild_id[BUILD_ID_SIZE * 2 + 1];
  46
  47        if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
  48                                 sizeof(kallsyms_build_id)) != 0)
  49                return -1;
  50
  51        build_id__sprintf(kallsyms_build_id, sizeof(kallsyms_build_id),
  52                          sbuild_id);
  53        fprintf(fp, "%s\n", sbuild_id);
  54        return 0;
  55}
  56
  57static int filename__fprintf_build_id(const char *name, FILE *fp)
  58{
  59        u8 build_id[BUILD_ID_SIZE];
  60        char sbuild_id[BUILD_ID_SIZE * 2 + 1];
  61
  62        if (filename__read_build_id(name, build_id,
  63                                    sizeof(build_id)) != sizeof(build_id))
  64                return 0;
  65
  66        build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
  67        return fprintf(fp, "%s\n", sbuild_id);
  68}
  69
  70static int perf_session__list_build_ids(void)
  71{
  72        struct perf_session *session;
  73
  74        elf_version(EV_CURRENT);
  75
  76        session = perf_session__new(input_name, O_RDONLY, force, false,
  77                                    &build_id__mark_dso_hit_ops);
  78        if (session == NULL)
  79                return -1;
  80
  81        /*
  82         * See if this is an ELF file first:
  83         */
  84        if (filename__fprintf_build_id(session->filename, stdout))
  85                goto out;
  86
  87        /*
  88         * in pipe-mode, the only way to get the buildids is to parse
  89         * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
  90         */
  91        if (with_hits || session->fd_pipe)
  92                perf_session__process_events(session, &build_id__mark_dso_hit_ops);
  93
  94        perf_session__fprintf_dsos_buildid(session, stdout, with_hits);
  95out:
  96        perf_session__delete(session);
  97        return 0;
  98}
  99
 100static int __cmd_buildid_list(void)
 101{
 102        if (show_kernel)
 103                return sysfs__fprintf_build_id(stdout);
 104
 105        return perf_session__list_build_ids();
 106}
 107
 108int cmd_buildid_list(int argc, const char **argv, const char *prefix __used)
 109{
 110        argc = parse_options(argc, argv, options, buildid_list_usage, 0);
 111        setup_pager();
 112        return __cmd_buildid_list();
 113}
 114
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