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Commit 3d387d92 authored by Daniel Vetter's avatar Daniel Vetter
Browse files

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: default avatarChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1482943330-11592-1-git-send-email-daniel.vetter@ffwll.ch
parent ae774e2c

drivers/gpu/drm/drm_print.c

+6 −0
Original line number Diff line number Diff line
@@ -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

include/drm/drm_print.h

+18 −2
Original line number Diff line number Diff line
@@ -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_ */