Add a put function for the coredump printer to bypass printf()
for constant strings for a speed boost.
v2: Add EXPORT_SYMBOL for _drm_puts_coredump
Signed-off-by: Jordan Crouse <jcro...@codeaurora.org>
---
drivers/gpu/drm/drm_print.c | 43 +++++++++++++++++++++++++++++++++++++
include/drm/drm_print.h | 2 ++
2 files changed, 45 insertions(+)
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index bef8f0ec5d73..ff20f4a764c8 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -30,6 +30,49 @@
#include <drm/drmP.h>
#include <drm/drm_print.h>
+void __drm_puts_coredump(struct drm_printer *p, const char *str)
+{
+ struct drm_print_iterator *iterator = p->arg;
+
+ ssize_t len;
+
+ if (!iterator->remain)
+ return;
+
+ if (iterator->offset < iterator->start) {
+ ssize_t copy;
+
+ len = strlen(str);
+
+ if (iterator->offset + len <= iterator->start) {
+ iterator->offset += len;
+ return;
+ }
+
+ copy = len - (iterator->start - iterator->offset);
+
+ if (copy > iterator->remain)
+ copy = iterator->remain;
+
+ /* Copy out the bit of the string that we need */
+ memcpy(iterator->data,
+ str + (iterator->start - iterator->offset), copy);
+
+ iterator->offset = iterator->start + copy;
+ iterator->remain -= copy;
+ } else {
+ ssize_t pos = iterator->offset - iterator->start;
+
+ len = min_t(ssize_t, strlen(str), iterator->remain);
+
+ memcpy(iterator->data + pos, str, len);
+
+ iterator->offset += len;
+ iterator->remain -= len;
+ }
+}
+EXPORT_SYMBOL(__drm_puts_coredump);
+
void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf)
{
struct drm_print_iterator *iterator = p->arg;
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index 3bc6ba4b7b2c..2a903ee7b428 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -75,6 +75,7 @@ struct drm_printer {
};
void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf);
+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);
@@ -129,6 +130,7 @@ drm_coredump_printer(struct drm_print_iterator *iter)
{
struct drm_printer p = {
.printfn = __drm_printfn_coredump,
+ .puts = __drm_puts_coredump,
.arg = iter,
};
return p;
--
2.17.1
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