A recent commit adding trace-events to drm noted:
trace_*() additions are strictly redundant with printks to syslog, not properly placed to reduce overall work.
That was because it didn't have the struct _ddebug *descriptor, whose .flags specify TRACE and PRINTK actions on a controlled callsite. So it could only duplicate the stream (from the enabled callsites).
To issue TRACE, PRINTK selectively:
- add struct _ddebug * param to prototypes and functions: ___drm_dbg(), __drm_dev_dbg() add "struct _ddebug;" to name the ptr-type, to silence warning.
- adjust the forwarding macros: drm_dbg, drm_dev_dbg to provide a descriptor, or NULL. basically this is dropping the _no_desc_, ie using _dynamic_func_call_cls(), since the callee can now accept it.
- add if (desc->flags ...) TRACE / PRINTK actions.
Signed-off-by: Jim Cromie jim.cromie@gmail.com --- drivers/gpu/drm/drm_print.c | 25 ++++++++++++++++--------- include/drm/drm_print.h | 20 ++++++++++---------- 2 files changed, 26 insertions(+), 19 deletions(-)
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c index b911f949af5b..8c33302212fc 100644 --- a/drivers/gpu/drm/drm_print.c +++ b/drivers/gpu/drm/drm_print.c @@ -258,8 +258,8 @@ 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; @@ -267,24 +267,31 @@ 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); - trace_drm_devdbg(dev, category, &vaf); + if (desc->flags & _DPRINTK_FLAGS_PRINTK) + dev_printk(KERN_DEBUG, dev, "[" DRM_NAME ":%ps] %pV", + __builtin_return_address(0), &vaf); + + if (desc->flags & _DPRINTK_FLAGS_TRACE) + trace_drm_devdbg(dev, category, &vaf); } else { - printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV", - __builtin_return_address(0), &vaf); - trace_drm_debug(category, &vaf); + if (desc->flags & _DPRINTK_FLAGS_PRINTK) + printk(KERN_DEBUG "[" DRM_NAME ":%ps] %pV", + __builtin_return_address(0), &vaf); + + if (desc->flags & _DPRINTK_FLAGS_TRACE) + trace_drm_debug(category, &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 0c704610c770..6d43b81a0ee4 100644 --- a/include/drm/drm_print.h +++ b/include/drm/drm_print.h @@ -360,9 +360,9 @@ 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. @@ -412,11 +412,11 @@ 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, eCat, fmt, ...) \ - __drm_dev_dbg(dev, eCat, fmt, ##__VA_ARGS__) + __drm_dev_dbg(NULL, dev, eCat, fmt, ##__VA_ARGS__) #else #define drm_dev_dbg(dev, eCat, fmt, ...) \ - _dynamic_func_call_no_desc_cls(fmt, eCat, __drm_dev_dbg, \ - dev, eCat, fmt, ##__VA_ARGS__) + _dynamic_func_call_cls(eCat, fmt, __drm_dev_dbg, \ + dev, eCat, fmt, ##__VA_ARGS__) #endif
/** @@ -519,8 +519,8 @@ 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, ...);
@@ -528,8 +528,8 @@ void __drm_err(const char *format, ...); #define __drm_dbg(fmt, ...) ___drm_dbg(NULL, fmt, ##__VA_ARGS__) #else #define __drm_dbg(eCat, fmt, ...) \ - _dynamic_func_call_no_desc_cls(fmt, eCat, ___drm_dbg, \ - eCat, fmt, ##__VA_ARGS__) + _dynamic_func_call_cls(eCat, fmt, ___drm_dbg, \ + eCat, fmt, ##__VA_ARGS__) #endif
/* Macros to make printk easier */