perf tools: Integrating the CoreSight decoding library

The Open CoreSight Decoding Library (openCSD) is a free and open library
to decode traces collected by the CoreSight hardware infrastructure.

This patch adds the required mechanic to recognise the presence of the
openCSD library on a system and set up miscellaneous flags to be used in
the compilation of the trace decoding feature.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Link: http://lkml.kernel.org/r/1516211539-5166-2-git-send-email-mathieu.poirier@linaro.org
Link: http://lkml.kernel.org/r/1516635644-24819-1-git-send-email-mathieu.poirier@linaro.org
[ Merged missing test-libopencsd.c file, provided later by Mathieu ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/build/Makefile.feature

@@ -66,7 +66,8 @@ FEATURE_TESTS_BASIC :=                  \
         bpf                             \
         sched_getcpu			\
         sdt				\
-        setns
+        setns				\
+        libopencsd
 
 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
 # of all feature tests

tools/build/feature/Makefile

@@ -52,7 +52,8 @@ FILES=                                          \
          test-cxx.bin                           \
          test-jvmti.bin				\
          test-sched_getcpu.bin			\
-         test-setns.bin
+         test-setns.bin				\
+         test-libopencsd.bin
 
 FILES := $(addprefix $(OUTPUT),$(FILES))
 
@@ -104,6 +105,10 @@ $(OUTPUT)test-sched_getcpu.bin:
 $(OUTPUT)test-setns.bin:
 	$(BUILD)
 
+$(OUTPUT)test-libopencsd.bin:
+	$(BUILD) # -lopencsd_c_api -lopencsd provided by
+		 # $(FEATURE_CHECK_LDFLAGS-libopencsd)
+
 DWARFLIBS := -ldw
 ifeq ($(findstring -static,${LDFLAGS}),-static)
 DWARFLIBS += -lelf -lebl -lz -llzma -lbz2

tools/build/feature/test-all.c

@@ -162,6 +162,10 @@
 # include "test-setns.c"
 #undef main
 
+#define main main_test_libopencsd
+# include "test-libopencsd.c"
+#undef main
+
 int main(int argc, char *argv[])
 {
 	main_test_libpython();
@@ -199,6 +203,7 @@ int main(int argc, char *argv[])
 	main_test_sched_getcpu();
 	main_test_sdt();
 	main_test_setns();
+	main_test_libopencsd();
 
 	return 0;
 }

tools/build/feature/test-libopencsd.c

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <opencsd/c_api/opencsd_c_api.h>
+
+int main(void)
+{
+	(void)ocsd_get_version();
+	return 0;
+}