perf header: Recognize version number for perf data file

Keep the recognized data file version within 'struct perf_header'.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1374083403-14591-8-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 13 insertions, 5 deletions

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index eefb052190f3..f558f83769af 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2480,6 +2480,7 @@ static int check_magic_endian(u64 magic, uint64_t hdr_sz,
         /* check for legacy format */
         ret = memcmp(&magic, __perf_magic1, sizeof(magic));
         if (ret == 0) {
+                ph->version = PERF_HEADER_VERSION_1;
                 pr_debug("legacy perf.data format\n");
                 if (is_pipe)
                         return try_all_pipe_abis(hdr_sz, ph);
@@ -2501,6 +2502,7 @@ static int check_magic_endian(u64 magic, uint64_t hdr_sz,
                 return -1;
 
         ph->needs_swap = true;
+        ph->version = PERF_HEADER_VERSION_2;
 
         return 0;
 }
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index e6387dcb95c0..307c9aed972e 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -34,6 +34,11 @@ enum {
         HEADER_FEAT_BITS        = 256,
 };
 
+enum perf_header_version {
+        PERF_HEADER_VERSION_1,
+        PERF_HEADER_VERSION_2,
+};
+
 struct perf_file_section {
         u64 offset;
         u64 size;
@@ -85,12 +90,13 @@ struct perf_session_env {
 };
 
 struct perf_header {
-        bool                    needs_swap;
-        u64                     data_offset;
-        u64                     data_size;
-        u64                     feat_offset;
+        enum perf_header_version        version;
+        bool                            needs_swap;
+        u64                             data_offset;
+        u64                             data_size;
+        u64                             feat_offset;
         DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
-        struct perf_session_env env;
+        struct perf_session_env         env;
 };
 
 struct perf_evlist;