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drm: Stub out debug prints

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Within the display server process, __drm_dbg consumes significant CPU time:
    2.40%  [kernel]       [k] __drm_dbg

Instead of compiling in all DRM debug print statements, stub them out to
reduce runtime overhead and size.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
This commit is contained in:
Sultan Alsawaf 2024-01-05 18:59:04 -08:00 • committed by Ksawlii
parent 0b239017a9
commit 60bb8b3c0a
2 changed files with 20 additions and 0 deletions
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4
drivers/gpu/drm/drm_print.c
View file

@ -160,11 +160,13 @@ void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf)
}
EXPORT_SYMBOL(__drm_printfn_info);
#ifdef CONFIG_DRM_DEBUG_PRINT
void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
{
pr_debug("%s %pV", p->prefix, vaf);
}
EXPORT_SYMBOL(__drm_printfn_debug);
#endif
void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf)
{
@ -256,6 +258,7 @@ void drm_dev_printk(const struct device *dev, const char *level,
}
EXPORT_SYMBOL(drm_dev_printk);
#ifdef CONFIG_DRM_DEBUG_PRINT
void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
const char *format, ...)
{
@ -298,6 +301,7 @@ void __drm_dbg(enum drm_debug_category category, const char *format, ...)
va_end(args);
}
EXPORT_SYMBOL(__drm_dbg);
#endif
void __drm_err(const char *format, ...)
{

16
include/drm/drm_print.h
View file

@ -85,7 +85,12 @@ void __drm_puts_coredump(struct drm_printer *p, const char *str);
void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
void __drm_puts_seq_file(struct drm_printer *p, const char *str);
void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
#ifdef CONFIG_DRM_DEBUG_PRINT
void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
#else
static inline
void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf) { }
#endif
void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf);
__printf(2, 3)
@ -333,9 +338,15 @@ 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, ...);
#ifdef CONFIG_DRM_DEBUG_PRINT
__printf(3, 4)
void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
const char *format, ...);
#else
static inline __printf(3, 4)
void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
const char *format, ...) { }
#endif
/**
* DRM_DEV_ERROR() - Error output.
@ -470,8 +481,13 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
* Prefer drm_device based logging over device or prink based logging.
*/
#ifdef CONFIG_DRM_DEBUG_PRINT
__printf(2, 3)
void __drm_dbg(enum drm_debug_category category, const char *format, ...);
#else
static inline __printf(2, 3)
void __drm_dbg(enum drm_debug_category category, const char *format, ...) { }
#endif
__printf(1, 2)
void __drm_err(const char *format, ...);