[RFC 4/6] drm: Respect driver set DRM_LOG_NAME in drm_printk

[Tvrtko Ursulin <tursulin@ursulin.net>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Since drm_printk is built inside the DRM core module, it will not respect
the potentially overriden by the driver DRM_LOG_NAME.

Make it tale the driver prefix and change it's wrappers so it is passed
in from the driver code. This makes the driver log messages correctly
identify from which driver they originated.

For instance i915, instead of:

 [drm:edp_panel_off [i915]] Wait for panel power off time

would now log debug messages as:

 [i915:edp_panel_off [i915]] Wait for panel power off time

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
---
 drivers/gpu/drm/drm_print.c          |  6 +++---
 drivers/gpu/drm/i915/intel_display.c |  3 ++-
 include/drm/drm_print.h              | 20 ++++++++++----------
 3 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index 27244f11c9a3..90d38c830392 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -89,7 +89,7 @@ void drm_dev_printk(const struct device *dev, const char *level,
 }
 EXPORT_SYMBOL(drm_dev_printk);
 
-void drm_printk(const char *level, unsigned int category,
+void drm_printk(const char *level, unsigned int category, const char *driver,
 		const char *format, ...)
 {
 	struct va_format vaf;
@@ -102,8 +102,8 @@ void drm_printk(const char *level, unsigned int category,
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	printk("%s" "[" DRM_LOG_NAME ":%ps]%s %pV",
-	       level, __builtin_return_address(0),
+	printk("%s[%s:%ps]%s %pV",
+	       level, driver, __builtin_return_address(0),
 	       strcmp(level, KERN_ERR) == 0 ? " *ERROR*" : "", &vaf);
 
 	va_end(args);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d585ce4c8732..51fea2eb1b2e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10973,7 +10973,8 @@ pipe_config_err(bool adjust, const char *name, const char *format, ...)
 	vaf.fmt = format;
 	vaf.va = &args;
 
-	drm_printk(level, category, "mismatch in %s %pV", name, &vaf);
+	drm_printk(level, category, DRM_LOG_NAME, "mismatch in %s %pV", name,
+		   &vaf);
 
 	va_end(args);
 }
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index d6901128faf2..c6047de9cbcc 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -207,8 +207,8 @@ __printf(6, 7)
 void drm_dev_printk(const struct device *dev, const char *level,
 		    unsigned int category, const char *function_name,
 		    const char *prefix, const char *format, ...);
-__printf(3, 4)
-void drm_printk(const char *level, unsigned int category,
+__printf(4, 5)
+void drm_printk(const char *level, unsigned int category, const char *driver,
 		const char *format, ...);
 
 /* Macros to make printk easier */
@@ -243,7 +243,7 @@ void drm_printk(const char *level, unsigned int category,
 	drm_dev_printk(dev, KERN_ERR, DRM_UT_NONE, __func__, " *ERROR*",\
 		       fmt, ##__VA_ARGS__)
 #define DRM_ERROR(fmt, ...)						\
-	drm_printk(KERN_ERR, DRM_UT_NONE, fmt,	##__VA_ARGS__)
+	drm_printk(KERN_ERR, DRM_UT_NONE, DRM_LOG_NAME, fmt, ##__VA_ARGS__)
 
 /**
  * Rate limited error output.  Like DRM_ERROR() but won't flood the log.
@@ -286,40 +286,40 @@ void drm_printk(const char *level, unsigned int category,
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_CORE, __func__, "", fmt,	\
 		       ##args)
 #define DRM_DEBUG(fmt, ...)						\
-	drm_printk(KERN_DEBUG, DRM_UT_CORE, fmt, ##__VA_ARGS__)
+	drm_printk(KERN_DEBUG, DRM_UT_CORE, DRM_LOG_NAME, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_DRIVER(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_DRIVER, __func__, "",	\
 		       fmt, ##args)
 #define DRM_DEBUG_DRIVER(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
+	drm_printk(KERN_DEBUG, DRM_UT_DRIVER, DRM_LOG_NAME, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_KMS(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_KMS, __func__, "", fmt,	\
 		       ##args)
 #define DRM_DEBUG_KMS(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_KMS, fmt, ##__VA_ARGS__)
+	drm_printk(KERN_DEBUG, DRM_UT_KMS, DRM_LOG_NAME, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_PRIME(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_PRIME, __func__, "",	\
 		       fmt, ##args)
 #define DRM_DEBUG_PRIME(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
+	drm_printk(KERN_DEBUG, DRM_UT_PRIME, DRM_LOG_NAME, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ATOMIC, __func__, "",	\
 		       fmt, ##args)
 #define DRM_DEBUG_ATOMIC(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
+	drm_printk(KERN_DEBUG, DRM_UT_ATOMIC, DRM_LOG_NAME, fmt, ##__VA_ARGS__)
 
 #define DRM_DEV_DEBUG_VBL(dev, fmt, args...)				\
 	drm_dev_printk(dev, KERN_DEBUG, DRM_UT_VBL, __func__, "", fmt,	\
 		       ##args)
 #define DRM_DEBUG_VBL(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_VBL, fmt, ##__VA_ARGS__)
+	drm_printk(KERN_DEBUG, DRM_UT_VBL, DRM_LOG_NAME, fmt, ##__VA_ARGS__)
 
 #define DRM_DEBUG_LEASE(fmt, ...)					\
-	drm_printk(KERN_DEBUG, DRM_UT_LEASE, fmt, ##__VA_ARGS__)
+	drm_printk(KERN_DEBUG, DRM_UT_LEASE, DRM_LOG_NAME, fmt, ##__VA_ARGS__)
 
 #define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, level, fmt, args...)	\
 ({									\
-- 
2.14.1

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