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drm: Add drm_puts() to complement drm_printf()

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Add drm_puts() for a much faster path to print constant strings
into a drm_printer object with memcpy and friends. This can
have seconds off of really large outputs such as GPU dumps.

If the drm_printer object supports a custom puts function then
use that otherwise fall back to the slower legacy printf call.

v2: Add documentation for drm_puts() per Daniel Vetter

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
[robclark fix minor htmldocs warning]
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Jordan Crouse 2018-07-24 10:33:21 -06:00 committed by Rob Clark
parent cfc57a18a3
commit 63f4cc015b
2 changed files with 19 additions and 0 deletions
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17
drivers/gpu/drm/drm_print.c
View file

@ -122,6 +122,23 @@ void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
}
EXPORT_SYMBOL(__drm_printfn_debug);
/**
* drm_puts - print a const string to a &drm_printer stream
* @p: the &drm printer
* @str: const string
*
* Allow &drm_printer types that have a constant string
* option to use it.
*/
void drm_puts(struct drm_printer *p, const char *str)
{
if (p->puts)
p->puts(p, str);
else
drm_printf(p, "%s", str);
}
EXPORT_SYMBOL(drm_puts);
/**
* drm_printf - print to a &drm_printer stream
* @p: the &drm_printer

2
include/drm/drm_print.h
View file

@ -69,6 +69,7 @@
struct drm_printer {
/* private: */
void (*printfn)(struct drm_printer *p, struct va_format *vaf);
void (*puts)(struct drm_printer *p, const char *str);
void *arg;
const char *prefix;
};
@ -80,6 +81,7 @@ void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
__printf(2, 3)
void drm_printf(struct drm_printer *p, const char *f, ...);
void drm_puts(struct drm_printer *p, const char *str);
__printf(2, 0)
/**