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>

4 files changed, 47 insertions, 1 deletions

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index f31ab3b8f918..43e2dfc2c73b 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -39,6 +39,7 @@ static const char *perf_event__names[] = {
         [PERF_RECORD_AUXTRACE_ERROR]            = "AUXTRACE_ERROR",
         [PERF_RECORD_THREAD_MAP]                = "THREAD_MAP",
         [PERF_RECORD_CPU_MAP]                   = "CPU_MAP",
+        [PERF_RECORD_STAT_CONFIG]               = "STAT_CONFIG",
 };
 
 const char *perf_event__name(unsigned int id)
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 74a434116b2c..16cee44de56b 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -228,6 +228,7 @@ enum perf_user_event_type { /* above any possible kernel type */
         PERF_RECORD_AUXTRACE_ERROR              = 72,
         PERF_RECORD_THREAD_MAP                  = 73,
         PERF_RECORD_CPU_MAP                     = 74,
+        PERF_RECORD_STAT_CONFIG                 = 75,
         PERF_RECORD_HEADER_MAX
 };
 
@@ -395,6 +396,24 @@ struct thread_map_event {
         struct thread_map_event_entry   entries[];
 };
 
+enum {
+        PERF_STAT_CONFIG_TERM__AGGR_MODE        = 0,
+        PERF_STAT_CONFIG_TERM__INTERVAL         = 1,
+        PERF_STAT_CONFIG_TERM__SCALE            = 2,
+        PERF_STAT_CONFIG_TERM__MAX              = 3,
+};
+
+struct stat_config_event_entry {
+        u64     tag;
+        u64     val;
+};
+
+struct stat_config_event {
+        struct perf_event_header        header;
+        u64                             nr;
+        struct stat_config_event_entry  data[];
+};
+
 union perf_event {
         struct perf_event_header        header;
         struct mmap_event               mmap;
@@ -419,6 +438,7 @@ union perf_event {
         struct context_switch_event     context_switch;
         struct thread_map_event         thread_map;
         struct cpu_map_event            cpu_map;
+        struct stat_config_event        stat_config;
 };
 
 void perf_event__print_totals(void);
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;
         }
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index 9e5925c78519..aa7ae73d76b4 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -57,7 +57,8 @@ struct perf_tool {
                         auxtrace_info,
                         auxtrace_error,
                         thread_map,
-                        cpu_map;
+                        cpu_map,
+                        stat_config;
         event_op3       auxtrace;
         bool            ordered_events;
         bool            ordering_requires_timestamps;