perf tools: Add stat config user level event

Adding the stat config event to pass/store stat config data, so report
tools (report/script) know how to interpret stat data.

The config data is stored in a 'tag|value' way to allow for easy
extension and backwards compatibility.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445784728-21732-12-git-send-email-jolsa@kernel.org
[ stat_config_term_event -> stat_config_event_entry ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 4350f5e85bf5..fbc52ab3eb75 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -315,6 +315,15 @@ int process_event_cpu_map_stub(struct perf_tool *tool __maybe_unused,
         return 0;
 }
 
+static
+int process_event_stat_config_stub(struct perf_tool *tool __maybe_unused,
+                                   union perf_event *event __maybe_unused,
+                                   struct perf_session *session __maybe_unused)
+{
+        dump_printf(": unhandled!\n");
+        return 0;
+}
+
 void perf_tool__fill_defaults(struct perf_tool *tool)
 {
         if (tool->sample == NULL)
@@ -369,6 +378,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
                 tool->thread_map = process_event_thread_map_stub;
         if (tool->cpu_map == NULL)
                 tool->cpu_map = process_event_cpu_map_stub;
+        if (tool->stat_config == NULL)
+                tool->stat_config = process_event_stat_config_stub;
 }
 
 static void swap_sample_id_all(union perf_event *event, void *data)
@@ -686,6 +697,16 @@ static void perf_event__cpu_map_swap(union perf_event *event,
         }
 }
 
+static void perf_event__stat_config_swap(union perf_event *event,
+                                         bool sample_id_all __maybe_unused)
+{
+        u64 size;
+
+        size  = event->stat_config.nr * sizeof(event->stat_config.data[0]);
+        size += 1; /* nr item itself */
+        mem_bswap_64(&event->stat_config.nr, size);
+}
+
 typedef void (*perf_event__swap_op)(union perf_event *event,
                                     bool sample_id_all);
 
@@ -715,6 +736,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
         [PERF_RECORD_AUXTRACE_ERROR]      = perf_event__auxtrace_error_swap,
         [PERF_RECORD_THREAD_MAP]          = perf_event__thread_map_swap,
         [PERF_RECORD_CPU_MAP]             = perf_event__cpu_map_swap,
+        [PERF_RECORD_STAT_CONFIG]         = perf_event__stat_config_swap,
         [PERF_RECORD_HEADER_MAX]          = NULL,
 };
 
@@ -1255,6 +1277,8 @@ static s64 perf_session__process_user_event(struct perf_session *session,
                 return tool->thread_map(tool, event, session);
         case PERF_RECORD_CPU_MAP:
                 return tool->cpu_map(tool, event, session);
+        case PERF_RECORD_STAT_CONFIG:
+                return tool->stat_config(tool, event, session);
         default:
                 return -EINVAL;
         }