perf annotate: Allow annotation for decompressed kernel modules

Decompressing kernel module file for objdump command if needed.
Annotation commands now display annotation for compressed kernel
modules.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-x4jcytk2d5qjmnjvb0w75q3f@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 31 insertions, 1 deletions

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 61bf9128e1f2..b72086eca943 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1008,6 +1008,32 @@ fallback:
                         }
                         filename = symfs_filename;
                 }
+        } else if (dso__needs_decompress(dso)) {
+                char tmp[PATH_MAX];
+                struct kmod_path m;
+                int fd;
+                bool ret;
+
+                if (kmod_path__parse_ext(&m, symfs_filename))
+                        goto out_free_filename;
+
+                snprintf(tmp, PATH_MAX, "/tmp/perf-kmod-XXXXXX");
+
+                fd = mkstemp(tmp);
+                if (fd < 0) {
+                        free(m.ext);
+                        goto out_free_filename;
+                }
+
+                ret = decompress_to_file(m.ext, symfs_filename, fd);
+
+                free(m.ext);
+                close(fd);
+
+                if (!ret)
+                        goto out_free_filename;
+
+                strcpy(symfs_filename, tmp);
         }
 
         snprintf(command, sizeof(command),
@@ -1027,7 +1053,7 @@ fallback:
 
         file = popen(command, "r");
         if (!file)
-                goto out_free_filename;
+                goto out_remove_tmp;
 
         while (!feof(file))
                 if (symbol__parse_objdump_line(sym, map, file, privsize,
@@ -1042,6 +1068,10 @@ fallback:
                 delete_last_nop(sym);
 
         pclose(file);
+
+out_remove_tmp:
+        if (dso__needs_decompress(dso))
+                unlink(symfs_filename);
 out_free_filename:
         if (delete_extract)
                 kcore_extract__delete(&kce);