[PATCH v11 10/19] drm_print: interpose drm_dev_dbg, __drm_dbg with forwarding macros

Jim Cromie
2022-01-07T05:30:13Z

drm_dev_dbg() & _drm_dbg() sit below the categorized layer of the DRM
debug API, and thus implement most of it. These are good places to
insert dynamic-debug jump-label mechanics, allowing DRM to avoid the
runtime cost of drm_debug_enabled().

Set up for this by changing the func names by adding '__' prefixes,
and define forwarding macros to the new names.

no functional changes.

memory cost baseline: (unchanged)
bash-5.1# drms_load
[ 9.220389] dyndbg: 1 debug prints in module drm
[ 9.224426] ACPI: bus type drm_connector registered
[ 9.302192] dyndbg: 2 debug prints in module ttm
[ 9.305033] dyndbg: 8 debug prints in module video
[ 9.627563] dyndbg: 127 debug prints in module i915
[ 9.721505] AMD-Vi: AMD IOMMUv2 functionality not available on this system - This is not a bug.
[ 10.091345] dyndbg: 2196 debug prints in module amdgpu
[ 10.106589] [drm] amdgpu kernel modesetting enabled.
[ 10.107270] amdgpu: CRAT table not found
[ 10.107926] amdgpu: Virtual CRAT table created for CPU
[ 10.108398] amdgpu: Topology: Add CPU node
[ 10.168507] dyndbg: 3 debug prints in module wmi
[ 10.329587] dyndbg: 3 debug prints in module nouveau

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
drivers/gpu/drm/drm_print.c | 10 +++++-----
include/drm/drm_print.h | 9 +++++++--
2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index cfcb89ffd89d..5dd6713c14f2 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -259,8 +259,8 @@ 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(const struct device *dev, enum drm_debug_category category,
+ const char *format, ...)
{
struct va_format vaf;
va_list args;
@@ -283,9 +283,9 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
}
va_end(args);
}
-EXPORT_SYMBOL(drm_dev_dbg);
+EXPORT_SYMBOL(__drm_dev_dbg);

-void __drm_dbg(enum drm_debug_category category, const char *format, ...)
+void ___drm_dbg(enum drm_debug_category category, const char *format, ...)
{
struct va_format vaf;
va_list args;
@@ -304,7 +304,7 @@ void __drm_dbg(enum drm_debug_category category, const char *format, ...)

va_end(args);
}
-EXPORT_SYMBOL(__drm_dbg);
+EXPORT_SYMBOL(___drm_dbg);

void __drm_err(const char *format, ...)
{
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index b4355bfd7888..f8fa5af11310 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -334,7 +334,7 @@ __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,
+void __drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
const char *format, ...);

/**
@@ -383,6 +383,9 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
} \
})

+#define drm_dev_dbg(dev, eCat, fmt, ...) \
+ __drm_dev_dbg(dev, eCat, fmt, ##__VA_ARGS__)
+
/**
* DRM_DEV_DEBUG() - Debug output for generic drm code
*
@@ -484,10 +487,12 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
*/

__printf(2, 3)
-void __drm_dbg(enum drm_debug_category category, const char *format, ...);
+void ___drm_dbg(enum drm_debug_category category, const char *format, ...);
__printf(1, 2)
void __drm_err(const char *format, ...);

+#define __drm_dbg(fmt, ...) ___drm_dbg(fmt, ##__VA_ARGS__)
+
/* Macros to make printk easier */

#define _DRM_PRINTK(once, level, fmt, ...) \
--
2.33.1