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path: root/drivers/gpu/drm/drm_print.c
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Diffstat (limited to 'drivers/gpu/drm/drm_print.c')
-rw-r--r--drivers/gpu/drm/drm_print.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index b25f98f33f6c..03d1f98e5ac7 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -30,6 +30,80 @@
#include <drm/drmP.h>
#include <drm/drm_print.h>
+void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf)
+{
+ struct drm_print_iterator *iterator = p->arg;
+ ssize_t len;
+
+ if (!iterator->remain)
+ return;
+
+ /* Figure out how big the string will be */
+ len = snprintf(NULL, 0, "%pV", vaf);
+
+ if (iterator->offset < iterator->start) {
+ char *buf;
+ ssize_t copy;
+
+ if (iterator->offset + len <= iterator->start) {
+ iterator->offset += len;
+ return;
+ }
+
+ /* Print the string into a temporary buffer */
+ buf = kmalloc(len + 1,
+ GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
+ if (!buf)
+ return;
+
+ snprintf(buf, len + 1, "%pV", vaf);
+
+ 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,
+ buf + (iterator->start - iterator->offset), copy);
+
+ iterator->offset = iterator->start + copy;
+ iterator->remain -= copy;
+
+ kfree(buf);
+ } else {
+ char *buf;
+ ssize_t pos = iterator->offset - iterator->start;
+
+ if (len < iterator->remain) {
+ snprintf(((char *) iterator->data) + pos,
+ iterator->remain, "%pV", vaf);
+
+ iterator->offset += len;
+ iterator->remain -= len;
+
+ return;
+ }
+
+ /* Print the string into a temporary buffer */
+ buf = kmalloc(len + 1,
+ GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
+ if (!buf)
+ return;
+
+ snprintf(buf, len + 1, "%pV", vaf);
+
+ /* Copy out the remaining bits */
+ memcpy(iterator->data + pos, buf, iterator->remain);
+
+ iterator->offset += iterator->remain;
+ iterator->remain = 0;
+
+ kfree(buf);
+ }
+}
+EXPORT_SYMBOL(__drm_printfn_coredump);
+
void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf)
{
seq_printf(p->arg, "%pV", vaf);