virgl: move logging to virgl_util.[ch]

Rename the debug callback to virgl logger and add virgl_logv for
logging.  vrend_printf becomes a wrapper of virgl_logv.

v2: use virgl_debug_callback_type (Ryan), add virgl_dummy_logger

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Ryan Neph <ryanneph@google.com>
Acked-by: Gert Wollny <gert.wollny@collabora.com>

src/virgl_util.c

@@ -34,8 +34,10 @@
 #endif
 #include <unistd.h>
 
+#include "os/os_misc.h"
 #include "util/u_pointer.h"
 
+#include <assert.h>
 #include <stdarg.h>
 #include <stdio.h>
 
@@ -115,6 +117,66 @@ void flush_eventfd(int fd)
     } while ((len == -1 && errno == EINTR) || len == sizeof(value));
 }
 
+static
+void virgl_default_logger(const char *fmt, va_list va)
+{
+   static FILE* fp = NULL;
+   if (NULL == fp) {
+      const char* log = getenv("VIRGL_LOG_FILE");
+      if (log) {
+         char *log_prefix = strdup(log);
+         char *log_suffix = strstr(log_prefix, "%PID%");
+         if (log_suffix) {
+            *log_suffix = 0;
+            log_suffix += 5;
+            int len = strlen(log) + 32;
+            char *name = malloc(len);
+            snprintf(name, len, "%s%d%s", log_prefix, getpid(), log_suffix);
+            fp = fopen(name, "a");
+            free(name);
+         } else {
+            fp = fopen(log, "a");
+         }
+         free(log_prefix);
+         if (NULL == fp) {
+            fprintf(stderr, "Can't open %s\n", log);
+            fp = stderr;
+         }
+      } else {
+            fp = stderr;
+      }
+   }
+   vfprintf(fp, fmt, va);
+   fflush(fp);
+}
+
+static
+void virgl_null_logger(UNUSED const char *fmt, UNUSED va_list va)
+{
+}
+
+static virgl_debug_callback_type virgl_logger = virgl_default_logger;
+
+virgl_debug_callback_type virgl_log_set_logger(virgl_debug_callback_type logger)
+{
+   virgl_debug_callback_type old = virgl_logger;
+
+   /* virgl_null_logger is internal */
+   if (old == virgl_null_logger)
+      old = NULL;
+   if (!logger)
+      logger = virgl_null_logger;
+
+   virgl_logger = logger;
+   return old;
+}
+
+void virgl_logv(const char *fmt, va_list va)
+{
+   assert(virgl_logger);
+   virgl_logger(fmt, va);
+}
+
 #if ENABLE_TRACING == TRACE_WITH_PERCETTO
 PERCETTO_CATEGORY_DEFINE(VIRGL_PERCETTO_CATEGORIES)
 

src/virgl_util.h

@@ -25,13 +25,16 @@
 #ifndef VIRGL_UTIL_H
 #define VIRGL_UTIL_H
 
-#include <stdint.h>
+#include <stdarg.h>
 #include <stdbool.h>
+#include <stdint.h>
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
+#include "virglrenderer.h"
+
 #define TRACE_WITH_PERFETTO 1
 #define TRACE_WITH_STDERR 2
 #define TRACE_WITH_PERCETTO 3
@@ -62,6 +65,17 @@ int create_eventfd(unsigned int initval);
 int write_eventfd(int fd, uint64_t val);
 void flush_eventfd(int fd);
 
+virgl_debug_callback_type virgl_log_set_logger(virgl_debug_callback_type logger);
+void virgl_logv(const char *fmt, va_list va);
+
+static inline void virgl_log(const char *fmt, ...)
+{
+   va_list va;
+   va_start(va, fmt);
+   virgl_logv(fmt, va);
+   va_end(va);
+}
+
 #ifdef ENABLE_TRACING
 void trace_init(void);
 

src/virglrenderer.c

@@ -744,7 +744,7 @@ int virgl_renderer_get_poll_fd(void)
 
 virgl_debug_callback_type virgl_set_debug_callback(virgl_debug_callback_type cb)
 {
-   return vrend_set_debug_callback(cb);
+   return virgl_log_set_logger(cb);
 }
 
 static int virgl_renderer_export_query(void *execute_args, uint32_t execute_size)

src/vrend_debug.c

@@ -178,56 +178,3 @@ int  vrend_debug_can_override(void)
 {
    return vrend_debug_flags & dbg_allow_guest_override;
 }
-
-static
-void vrend_default_debug_callback(const char *fmt, va_list va)
-{
-   static FILE* fp = NULL;
-   if (NULL == fp) {
-      const char* log = getenv("VIRGL_LOG_FILE");
-      if (log) {
-         char *log_prefix = strdup(log);
-         char *log_suffix = strstr(log_prefix, "%PID%");
-         if (log_suffix) {
-            *log_suffix = 0;
-            log_suffix += 5;
-            int len = strlen(log) + 32;
-            char *name = malloc(len);
-            snprintf(name, len, "%s%d%s", log_prefix, getpid(), log_suffix);
-            fp = fopen(name, "a");
-            free(name);
-         } else {
-            fp = fopen(log, "a");
-         }
-         free(log_prefix);
-         if (NULL == fp) {
-            fprintf(stderr, "Can't open %s\n", log);
-            fp = stderr;
-         }
-      } else {
-            fp = stderr;
-      }
-   }
-   vfprintf(fp, fmt, va);
-   fflush(fp);
-}
-
-static virgl_debug_callback_type debug_callback = vrend_default_debug_callback;
-
-void vrend_printf(const char *fmt, ...)
-{
-   if (debug_callback) {
-      va_list va;
-      va_start(va, fmt);
-      debug_callback(fmt, va);
-      va_end(va);
-   }
-}
-
-virgl_debug_callback_type vrend_set_debug_callback(virgl_debug_callback_type cb)
-{
-   virgl_debug_callback_type retval = debug_callback;
-   debug_callback = cb;
-   return retval;
-}
-

src/vrend_debug.h

@@ -26,6 +26,7 @@
 #define vrend_debug_h
 
 #include "virgl_protocol.h"
+#include "virgl_util.h"
 #include <stdarg.h>
 
 struct vrend_context;
@@ -70,11 +71,13 @@ unsigned vrend_debug(const struct vrend_context *ctx, enum virgl_debug_flags fla
 
 void vrend_debug_add_flag(enum virgl_debug_flags flag);
 
-void vrend_printf(const char *fmt, ...);
-
-typedef void (*virgl_debug_callback_type)(const char *fmt, va_list ap);
-
-virgl_debug_callback_type vrend_set_debug_callback(virgl_debug_callback_type cb);
+static inline void vrend_printf(const char *fmt, ...)
+{
+   va_list va;
+   va_start(va, fmt);
+   virgl_logv(fmt, va);
+   va_end(va);
+}
 
 #ifndef NDEBUG
 #define VREND_DEBUG(flag, ctx,  ...) \