[PATCH 03/13] drm: Add drm_puts() to complement drm_printf()

[Jordan Crouse <jcrouse-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

Add drm_puts() for a much faster path to print constant strings
into a drm_printer object with memcpy and friends. This can
shave 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.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---
 drivers/gpu/drm/drm_print.c | 9 +++++++++
 include/drm/drm_print.h     | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index 03d1f98e5ac7..8fd489248a50 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -122,6 +122,15 @@ void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
 }
 EXPORT_SYMBOL(__drm_printfn_debug);
 
+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
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index 0ea440fb5ec3..b16f4ecaa984 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -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)
 /**
-- 
2.17.1

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