perf c2c report: Add c2c related stats stdio output

Display c2c related configuration options/setup.
So far it's output of monitored events:

  $ perf c2c report --stats
  ...

  =================================================
                   c2c details
  =================================================
    Events                            : cpu/mem-loads,ldlat=50/pp
                                      : cpu/mem-stores/pp
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-ypz84f3a9fumyttrxurm458z@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-c2c.c

@@ -13,6 +13,8 @@
 #include "tool.h"
 #include "data.h"
 #include "sort.h"
+#include "evlist.h"
+#include "evsel.h"
 #include <asm/bug.h>
 #include "ui/browsers/hists.h"
 
@@ -1893,13 +1895,32 @@ static void print_pareto(FILE *out)
 	}
 }
 
-static void perf_c2c__hists_fprintf(FILE *out)
+static void print_c2c_info(FILE *out, struct perf_session *session)
+{
+	struct perf_evlist *evlist = session->evlist;
+	struct perf_evsel *evsel;
+	bool first = true;
+
+	fprintf(out, "=================================================\n");
+	fprintf(out, "                 c2c details                     \n");
+	fprintf(out, "=================================================\n");
+
+	evlist__for_each_entry(evlist, evsel) {
+		fprintf(out, "%-36s: %s\n", first ? "  Events" : "",
+			perf_evsel__name(evsel));
+		first = false;
+	}
+}
+
+static void perf_c2c__hists_fprintf(FILE *out, struct perf_session *session)
 {
 	setup_pager();
 
 	print_c2c__display_stats(out);
 	fprintf(out, "\n");
 	print_shared_cacheline_info(out);
+	fprintf(out, "\n");
+	print_c2c_info(out, session);
 
 	if (c2c.stats_only)
 		return;
@@ -2073,18 +2094,18 @@ static int perf_c2c__hists_browse(struct hists *hists)
 	return 0;
 }
 
-static void perf_c2c_display(void)
+static void perf_c2c_display(struct perf_session *session)
 {
 	if (c2c.use_stdio)
-		perf_c2c__hists_fprintf(stdout);
+		perf_c2c__hists_fprintf(stdout, session);
 	else
 		perf_c2c__hists_browse(&c2c.hists.hists);
 }
 #else
-static void perf_c2c_display(void)
+static void perf_c2c_display(struct perf_session *session)
 {
 	use_browser = 0;
-	perf_c2c__hists_fprintf(stdout);
+	perf_c2c__hists_fprintf(stdout, session);
 }
 #endif /* HAVE_SLANG_SUPPORT */
 
@@ -2197,7 +2218,7 @@ static int perf_c2c__report(int argc, const char **argv)
 
 	ui_quirks();
 
-	perf_c2c_display();
+	perf_c2c_display(session);
 
 out_session:
 	perf_session__delete(session);