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drm/printer: add debug printer 

Useful for dumping lots of data into dmesg, e.g. drm_mm.

v2: Fixup export_symbol line, I misplaced a hunk (Chris).

Cc: Rob Clark <robdclark@gmail.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1482943330-11592-1-git-send-email-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2016-12-28 17:42:09 +01:00
parent ae774e2c68
commit 3d387d923c
2 changed files with 24 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/drm_print.c
View File

@ -40,6 +40,12 @@ void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf)
}
EXPORT_SYMBOL(__drm_printfn_info);
void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
{
pr_debug("%s %pV", p->prefix, vaf);
}
EXPORT_SYMBOL(__drm_printfn_debug);
/**
* drm_printf - print to a &drm_printer stream
* @p: the &drm_printer

20
include/drm/drm_print.h
View File

@ -60,19 +60,20 @@
/**
* struct drm_printer - drm output "stream"
* @printfn: actual output fxn
* @arg: output fxn specific data
*
* Do not use struct members directly. Use drm_printer_seq_file(),
* drm_printer_info(), etc to initialize. And drm_printf() for output.
*/
struct drm_printer {
/* private: */
void (*printfn)(struct drm_printer *p, struct va_format *vaf);
void *arg;
const char *prefix;
};
void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
void drm_printf(struct drm_printer *p, const char *f, ...);
@ -109,4 +110,19 @@ static inline struct drm_printer drm_info_printer(struct device *dev)
return p;
}
/**
* drm_debug_printer - construct a &drm_printer that outputs to pr_debug()
* @prefix: debug output prefix
*
* RETURNS:
* The &drm_printer object
*/
static inline struct drm_printer drm_debug_printer(const char *prefix)
{
struct drm_printer p = {
.printfn = __drm_printfn_debug,
.prefix = prefix
};
return p;
}
#endif /* DRM_PRINT_H_ */