util/perfetto: Add one-time init

Various places around mesa which might want to register a data-source,
etc, should call util_perfetto_init() first to ensure we connect to the
tracing service.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Acked-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9901>

meson.build

@@ -1972,6 +1972,14 @@ else
   dep_lmsensors = null_dep
 endif
 
+with_perfetto = get_option('perfetto')
+with_datasources = get_option('datasources')
+with_any_datasource = with_datasources.length() != 0
+if with_perfetto
+  dep_perfetto = dependency('perfetto', fallback: ['perfetto', 'dep_perfetto'])
+  pre_args += '-DHAVE_PERFETTO'
+endif
+
 # If the compiler supports it, put function and data symbols in their
 # own sections and GC the sections after linking.  This lets drivers
 # drop shared code unused by that specific driver (particularly
@@ -2046,13 +2054,6 @@ endif
 # as GCC LTO drops them. See: https://bugs.freedesktop.org/show_bug.cgi?id=109391
 gcc_lto_quirk = (cc.get_id() == 'gcc') ? ['-fno-lto'] : []
 
-with_perfetto = get_option('perfetto')
-with_datasources = get_option('datasources')
-with_any_datasource = with_datasources.length() != 0
-if with_perfetto
-  dep_perfetto = dependency('perfetto', fallback: ['perfetto', 'dep_perfetto'])
-endif
-
 subdir('include')
 subdir('bin')
 subdir('src')