remove TRACE_SCOPE_FMT to simplify tracing API

As we transition to perfetto, there are more efficient ways
of adding metadata to traces that we can use when it is
needed.

Signed-off-by: John Bates <jbates@chromium.org>
Reviewed-By: Gert Wollny <gert.wollny@collabora.com>

src/virgl_util.c

@@ -126,24 +126,13 @@ void trace_init(void)
    vperfetto_min_startTracing(&config);
 }
 
-char *trace_begin(const char* scope)
+const char *trace_begin(const char *scope)
 {
    vperfetto_min_beginTrackEvent_VMM(scope);
-   return (void *)1;
+   return scope;
 }
 
-char *trace_begin_fmt(const char* format, ...)
-{
-   char buffer[1024];
-   va_list args;
-   va_start (args, format);
-   vsnprintf (buffer, sizeof(buffer), format, args);
-   va_end (args);
-   vperfetto_min_beginTrackEvent_VMM(buffer);
-   return (void *)1;
-}
-
-void trace_end(char **dummy)
+void trace_end(const char **dummy)
 {
    (void)dummy;
    vperfetto_min_endTrackEvent_VMM();
@@ -156,38 +145,22 @@ void trace_init(void)
 {
 }
 
-char *trace_begin_fmt(const char* format, ...)
+const char *trace_begin(const char *scope)
 {
    for (int i = 0; i < nesting_depth; ++i)
       fprintf(stderr, "  ");
 
-   fprintf(stderr, "ENTER:");
-   char *buffer;
-   va_list args;
-   va_start (args, format);
-   int size = vasprintf(&buffer, format, args);
-
-   if (size < 0)
-      buffer=strdup("error");
-
-   va_end (args);
-   fprintf(stderr, "%s\n", buffer);
+   fprintf(stderr, "ENTER:%s\n", scope);
    nesting_depth++;
 
-   return buffer;
-}
-
-char *trace_begin(const char* scope)
-{
-   return trace_begin_fmt("%s", scope);
+   return scope;
 }
 
-void trace_end(char **func_name)
+void trace_end(const char **func_name)
 {
    --nesting_depth;
    for (int i = 0; i < nesting_depth; ++i)
       fprintf(stderr, "  ");
    fprintf(stderr, "LEAVE %s\n", *func_name);
-   free(*func_name);
 }
 #endif

src/virgl_util.h

@@ -63,29 +63,20 @@ void flush_eventfd(int fd);
 
 #ifdef ENABLE_TRACING
 void trace_init(void);
-char *trace_begin(const char* scope);
-char *trace_begin_fmt(const char* format, ...);
-void trace_end(char **dummy);
+const char *trace_begin(const char *scope);
+void trace_end(const char **dummy);
 
 #define TRACE_INIT() trace_init()
-#define TRACE_FUNC() \
-   char *trace_dummy __attribute__((cleanup (trace_end), unused)) = \
-   trace_begin(__func__)
+#define TRACE_FUNC() TRACE_SCOPE(__func__)
 
 #define TRACE_SCOPE(SCOPE) \
-   char *trace_dummy __attribute__((cleanup (trace_end), unused)) = \
+   const char *trace_dummy __attribute__((cleanup (trace_end), unused)) = \
    trace_begin(SCOPE)
 
-
-#define TRACE_SCOPE_FMT(FORMAT, ...) \
-   char *trace_dummy __attribute__((cleanup (trace_end), unused)) = \
-   trace_begin_fmt(FORMAT, __VA_ARGS__)
-
 #else
 #define TRACE_INIT()
 #define TRACE_FUNC()
-#define TRACE_SCOPE(FORMAT, ...)
-#define TRACE_SCOPE_FMT(FORMAT, ...)
+#define TRACE_SCOPE(SCOPE)
 #endif
 
 #endif /* VIRGL_UTIL_H */

src/vrend_decode.c

@@ -756,7 +756,7 @@ static int vrend_decode_create_object(struct vrend_context *ctx, const uint32_t
    VREND_DEBUG(dbg_object, ctx,"  CREATE %-18s handle:0x%x len:%d\n",
                vrend_get_object_type_name(obj_type), handle, length);
 
-   TRACE_SCOPE_FMT("CREATE %-18s", vrend_get_object_type_name(obj_type));
+   TRACE_SCOPE(vrend_get_object_type_name(obj_type));
 
    switch (obj_type){
    case VIRGL_OBJECT_BLEND: