perf coresight: Do not test for libopencsd by default

Since it is not yet that generally available, avoid testing for the
presence of libcoresight in the fast path test-all.bin feature test.

  # dnf search opencsd
  No matches found.
  # dnf search OpenCSD
  No matches found.
  # cat /etc/fedora-release
  Fedora release 29 (Twenty Nine)
  #

I.e. right now, in my system test-all.bin is failing all the time since
Fedora29 doesn't have libopencsd available:

  $ cat /tmp/build/perf/feature/test-all.make.output
  In file included from test-all.c:174:
  test-libopencsd.c:2:10: fatal error: opencsd/c_api/opencsd_c_api.h: No such file or directory
   #include <opencsd/c_api/opencsd_c_api.h>
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  compilation terminated.

See:

  6ab2b76 ("perf build: Disable libbabeltrace check by default")

For the rationale, as soon as libopencsd becomes more generally packaged
and available, we do the same thing we did with babeltrace, enabling it
by default, as done in:

  24787af ("perf tools: Enable LIBBABELTRACE by default")

For now, to explicitely ask for opencsd, make sure you have it installed
and use:

   make -C tools/perf CORESIGHT=1

The feature test output will be there as an empty file:

  $ ls -la /tmp/build/perf/feature/test-libopencsd.make.output

Because the binary used for the feature check was successfully built:

  $ ls -la /tmp/build/perf/feature/test-libopencsd.bin
  -rwxrwxr-x. 1 acme acme 18336 Feb 12 14:49 /tmp/build/perf/feature/test-libopencsd.bin
  $ ldd /tmp/build/perf/feature/test-libopencsd.bin
	linux-vdso.so.1 (0x00007fffe18cc000)
	libopencsd_c_api.so.0 => /lib64/libopencsd_c_api.so.0 (0x00007fb8e67f6000)
	libopencsd.so.0 => /lib64/libopencsd.so.0 (0x00007fb8e676f000)
	libc.so.6 => /lib64/libc.so.6 (0x00007fb8e65a9000)
	libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fb8e6411000)
	libm.so.6 => /lib64/libm.so.6 (0x00007fb8e628d000)
	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fb8e6272000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fb8e6828000)
  $

And the resulting perf binary will be linked with it:

  -rw-rw-r--. 1 acme acme 0 Feb 12 14:49 /tmp/build/perf/feature/test-libopencsd.make.output
  $ ldd ~/bin/perf | grep opencsd
	libopencsd_c_api.so.0 => /lib64/libopencsd_c_api.so.0 (0x00007fd43097f000)
	libopencsd.so.0 => /lib64/libopencsd.so.0 (0x00007fd4308f8000)
  $

To make sure this gets built before pushing things upstream I have a
ubuntu:19.04-x-arm64 container that has:

  [root@quaco x-arm64]# grep CORESIGHT Dockerfile
  ENV EXTRA_MAKE_ARGS=CORESIGHT=1
  [root@quaco x-arm64]#

So that I always build with libopencsd before pushing things upstream.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Mathieu Poirier <mathieu.poirier@linaro.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: https://lkml.kernel.org/n/tip-20vyy39jw9jgrijesi30fgox@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/build/Makefile.feature

@@ -70,7 +70,6 @@ FEATURE_TESTS_BASIC :=                  \
         sched_getcpu			\
         sdt				\
         setns				\
-        libopencsd			\
         libaio
 
 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
@@ -84,6 +83,7 @@ FEATURE_TESTS_EXTRA :=                  \
          libbabeltrace                  \
          libbfd-liberty                 \
          libbfd-liberty-z               \
+         libopencsd                     \
          libunwind-debug-frame          \
          libunwind-debug-frame-arm      \
          libunwind-debug-frame-aarch64  \

tools/build/feature/test-all.c

@@ -170,10 +170,6 @@
 # include "test-setns.c"
 #undef main
 
-#define main main_test_libopencsd
-# include "test-libopencsd.c"
-#undef main
-
 #define main main_test_libaio
 # include "test-libaio.c"
 #undef main
@@ -217,7 +213,6 @@ int main(int argc, char *argv[])
 	main_test_sched_getcpu();
 	main_test_sdt();
 	main_test_setns();
-	main_test_libopencsd();
 	main_test_libaio();
 
 	return 0;

tools/perf/Makefile.config

@@ -388,7 +388,8 @@ ifeq ($(feature-setns), 1)
   $(call detected,CONFIG_SETNS)
 endif
 
-ifndef NO_CORESIGHT
+ifdef CORESIGHT
+  $(call feature_check,libopencsd)
   ifeq ($(feature-libopencsd), 1)
     CFLAGS += -DHAVE_CSTRACE_SUPPORT $(LIBOPENCSD_CFLAGS)
     LDFLAGS += $(LIBOPENCSD_LDFLAGS)

tools/perf/Makefile.perf

@@ -102,7 +102,7 @@ include ../scripts/utilities.mak
 # When selected, pass LLVM_CONFIG=/path/to/llvm-config to `make' if
 # llvm-config is not in $PATH.
 #
-# Define NO_CORESIGHT if you do not want support for CoreSight trace decoding.
+# Define CORESIGHT if you DO WANT support for CoreSight trace decoding.
 #
 # Define NO_AIO if you do not want support of Posix AIO based trace
 # streaming for record mode. Currently Posix AIO trace streaming is