[PATCH 1/3] drm/print: Add generic drm dev printk function

[Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>]

We already have some drm printk functions that need to duplicate
a code to get a similar format of the final result, for example:

  [ ] 0000:00:00.0: [drm:foo] bar
  [ ] 0000:00:00.0: [drm] foo bar
  [ ] 0000:00:00.0: [drm] *ERROR* foo

Add a generic __drm_dev_vprintk() function that can format the
final message like all other existing function do and allows us
to keep the formatting code in one place.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
---
 drivers/gpu/drm/drm_print.c | 49 ++++++++++++++++++++-----------------
 include/drm/drm_print.h     |  3 +++
 2 files changed, 30 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index cf2efb44722c..a2b60c8245a1 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -187,19 +187,12 @@ void __drm_printfn_dbg(struct drm_printer *p, struct va_format *vaf)
 	const struct drm_device *drm = p->arg;
 	const struct device *dev = drm ? drm->dev : NULL;
 	enum drm_debug_category category = p->category;
-	const char *prefix = p->prefix ?: "";
-	const char *prefix_pad = p->prefix ? " " : "";
 
 	if (!__drm_debug_enabled(category))
 		return;
 
 	/* Note: __builtin_return_address(0) is useless here. */
-	if (dev)
-		dev_printk(KERN_DEBUG, dev, "[" DRM_NAME "]%s%s %pV",
-			   prefix_pad, prefix, vaf);
-	else
-		printk(KERN_DEBUG "[" DRM_NAME "]%s%s %pV",
-		       prefix_pad, prefix, vaf);
+	__drm_dev_vprintk(dev, KERN_DEBUG, NULL, p->prefix, vaf);
 }
 EXPORT_SYMBOL(__drm_printfn_dbg);
 
@@ -277,6 +270,29 @@ void drm_print_bits(struct drm_printer *p, unsigned long value,
 }
 EXPORT_SYMBOL(drm_print_bits);
 
+void __drm_dev_vprintk(const struct device *dev, const char *level,
+		       const void *origin, const char *prefix,
+		       struct va_format *vaf)
+{
+	const char *prefix_pad = prefix ? " " : (prefix = "");
+
+	if (dev)
+		if (origin)
+			dev_printk(level, dev, "[" DRM_NAME ":%ps]%s%s %pV",
+				   origin, prefix_pad, prefix, vaf);
+		else
+			dev_printk(level, dev, "[" DRM_NAME "]%s%s %pV",
+				   prefix_pad, prefix, vaf);
+	else
+		if (origin)
+			printk("%s" "[" DRM_NAME ":%ps]%s%s %pV",
+			       level, origin, prefix_pad, prefix, vaf);
+		else
+			printk("%s" "[" DRM_NAME "]%s%s %pV",
+			       level, prefix_pad, prefix, vaf);
+}
+EXPORT_SYMBOL(__drm_dev_vprintk);
+
 void drm_dev_printk(const struct device *dev, const char *level,
 		    const char *format, ...)
 {
@@ -287,12 +303,7 @@ void drm_dev_printk(const struct device *dev, const char *level,
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	if (dev)
-		dev_printk(level, dev, "[" DRM_NAME ":%ps] %pV",
-			   __builtin_return_address(0), &vaf);
-	else
-		printk("%s" "[" DRM_NAME ":%ps] %pV",
-		       level, __builtin_return_address(0), &vaf);
+	__drm_dev_vprintk(dev, level, __builtin_return_address(0), NULL, &vaf);
 
 	va_end(args);
 }
@@ -312,12 +323,7 @@ void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev,
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	if (dev)
-		dev_printk(KERN_DEBUG, dev, "[" DRM_NAME ":%ps] %pV",
-			   __builtin_return_address(0), &vaf);
-	else
-		printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
-		       __builtin_return_address(0), &vaf);
+	__drm_dev_vprintk(dev, KERN_DEBUG, __builtin_return_address(0), NULL, &vaf);
 
 	va_end(args);
 }
@@ -351,8 +357,7 @@ void __drm_err(const char *format, ...)
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	printk(KERN_ERR "[" DRM_NAME ":%ps] *ERROR* %pV",
-	       __builtin_return_address(0), &vaf);
+	__drm_dev_vprintk(NULL, KERN_ERR, __builtin_return_address(0), "*ERROR*", &vaf);
 
 	va_end(args);
 }
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index 089950ad8681..bb1801c58544 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -366,6 +366,9 @@ static inline struct drm_printer drm_err_printer(struct drm_device *drm,
 __printf(3, 4)
 void drm_dev_printk(const struct device *dev, const char *level,
 		    const char *format, ...);
+void __drm_dev_vprintk(const struct device *dev, const char *level,
+		       const void *origin, const char *prefix,
+		       struct va_format *vaf);
 struct _ddebug;
 __printf(4, 5)
 void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev,
-- 
2.43.0