linux-kernel - [PATCH 12/13] drm_print: add _ddebug desc to drm

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Message-Id: <20220217034829.64395-13-jim.cromie@gmail.com>
Date:   Wed, 16 Feb 2022 20:48:28 -0700
From:   Jim Cromie <jim.cromie@...il.com>
To:     jbaron@...mai.com, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org
Cc:     daniel.vetter@...ll.ch, seanpaul@...omium.org, robdclark@...il.com,
        linux@...musvillemoes.dk, joe@...ches.com,
        Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH 12/13] drm_print: add _ddebug desc to drm_*dbg prototypes

Add a struct _ddebug ptr to drm_dbg() and drm_dev_dbg() protos.

And upgrade the current use of _dynamic_func_call_no_desc(); ie drop
the '_no_desc', since the factory macro's callees (these 2 functions)
are now expecting the arg.

This lets those functions act more like pr_debug().  It also means
that these functions don't just get the decorations from an underlying
implementation.  DRM already has standards for logging/messaging;
tossing optional decorations on top may not help.

use that info

provide it to dyndbg [1], which can then
control debug enablement and decoration for all those drm.debug
callsites.

For CONFIG_DRM_USE_DYNAMIC_DEBUG=N, just pass null.
NB: desc->class_id is redundant with category, but !!desc dependent.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 drivers/gpu/drm/drm_print.c | 23 +++++++++++++----------
 include/drm/drm_print.h     | 23 ++++++++++++-----------
 2 files changed, 25 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index 24c57b92dc69..c9b2a2ab0d3d 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -255,8 +255,8 @@ void drm_dev_printk(const struct device *dev, const char *level,
 }
 EXPORT_SYMBOL(drm_dev_printk);
 
-void __drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
-		   const char *format, ...)
+void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev,
+		   enum drm_debug_category category, const char *format, ...)
 {
 	struct va_format vaf;
 	va_list args;
@@ -264,22 +264,25 @@ void __drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
 	if (!__drm_debug_enabled(category))
 		return;
 
+	/* we know we are printing for either syslog, tracefs, or both */
 	va_start(args, format);
 	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);
-
+	if (dev) {
+		if (dyndbg_site_is_printing(desc))
+			dev_printk(KERN_DEBUG, dev, "[" DRM_NAME ":%ps] %pV",
+				   __builtin_return_address(0), &vaf);
+	} else {
+		if (dyndbg_site_is_printing(desc))
+			printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV",
+			       __builtin_return_address(0), &vaf);
+	}
 	va_end(args);
 }
 EXPORT_SYMBOL(__drm_dev_dbg);
 
-void ___drm_dbg(enum drm_debug_category category, const char *format, ...)
+void ___drm_dbg(struct _ddebug *desc, enum drm_debug_category category, const char *format, ...)
 {
 	struct va_format vaf;
 	va_list args;
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index 38ef044d786e..13d52b60f388 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -31,6 +31,7 @@
 #include <linux/seq_file.h>
 #include <linux/device.h>
 #include <linux/debugfs.h>
+#include <linux/dynamic_debug.h>
 
 #include <drm/drm.h>
 
@@ -361,9 +362,9 @@ static inline bool drm_debug_enabled(enum drm_debug_category category)
 __printf(3, 4)
 void drm_dev_printk(const struct device *dev, const char *level,
 		    const char *format, ...);
-__printf(3, 4)
-void __drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
-		 const char *format, ...);
+__printf(4, 5)
+void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev,
+		   enum drm_debug_category category, const char *format, ...);
 
 /**
  * DRM_DEV_ERROR() - Error output.
@@ -413,11 +414,11 @@ void __drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
 
 #if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
 #define drm_dev_dbg(dev, cat, fmt, ...)				\
-	__drm_dev_dbg(dev, cat, fmt, ##__VA_ARGS__)
+	__drm_dev_dbg(NULL, dev, cat, fmt, ##__VA_ARGS__)
 #else
 #define drm_dev_dbg(dev, cat, fmt, ...)				\
-	_dynamic_func_call_no_desc(fmt, __drm_dev_dbg,			\
-				   dev, cat, fmt, ##__VA_ARGS__)
+	_dynamic_func_call_cls(cat, fmt, __drm_dev_dbg,		\
+			       dev, cat, fmt, ##__VA_ARGS__)
 #endif
 
 /**
@@ -520,17 +521,17 @@ void __drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
  * Prefer drm_device based logging over device or prink based logging.
  */
 
-__printf(2, 3)
-void ___drm_dbg(enum drm_debug_category category, const char *format, ...);
+__printf(3, 4)
+void ___drm_dbg(struct _ddebug *desc, enum drm_debug_category category, const char *format, ...);
 __printf(1, 2)
 void __drm_err(const char *format, ...);
 
 #if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
-#define __drm_dbg(fmt, ...)		___drm_dbg(fmt, ##__VA_ARGS__)
+#define __drm_dbg(fmt, ...)		___drm_dbg(NULL, fmt, ##__VA_ARGS__)
 #else
 #define __drm_dbg(cat, fmt, ...)					\
-	_dynamic_func_call_no_desc(fmt, ___drm_dbg,			\
-				   cat, fmt, ##__VA_ARGS__)
+	_dynamic_func_call_cls(cat, fmt, ___drm_dbg,			\
+			       cat, fmt, ##__VA_ARGS__)
 #endif
 
 /* Macros to make printk easier */
-- 
2.35.1