kernel/tools/perf/builtin-buildid-list.c

   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          * in pipe-mode, the only way to get the buildids is to parse
  74          * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
  75          */
  76         if (with_hits || perf_data_file__is_pipe(&file))
  77                 perf_session__process_events(session);
  78
  79         perf_session__fprintf_dsos_buildid(session, stdout, dso__skip_buildid, with_hits);
  80         perf_session__delete(session);
  81 out:
  82         return 0;
  83 }
  84
  85 int cmd_buildid_list(int argc, const char **argv,
  86                      const char *prefix __maybe_unused)
  87 {
  88         bool show_kernel = false;
  89         bool with_hits = false;
  90         bool force = false;
  91         const struct option options[] = {
  92         OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
  93         OPT_STRING('i', "input", &input_name, "file", "input file name"),
  94         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
  95         OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
  96         OPT_INCR('v', "verbose", &verbose, "be more verbose"),
  97         OPT_END()
  98         };
  99         const char * const buildid_list_usage[] = {
 100                 "perf buildid-list [<options>]",
 101                 NULL
 102         };
 103
 104         argc = parse_options(argc, argv, options, buildid_list_usage, 0);
 105         setup_pager();
 106
 107         if (show_kernel)
 108                 return sysfs__fprintf_build_id(stdout);
 109
 110         return perf_session__list_build_ids(force, with_hits);
 111 }