[PATCH 1/3] drm/print: add drm_print_hex_dump()

[Jani Nikula]

Add a helper to print a hex dump to a struct drm_printer. There's no
fancy formatting stuff, just 16 space-separated bytes per line, with an
optional prefix.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/drm_print.c | 23 +++++++++++++++++++++++
 include/drm/drm_print.h     |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
index 08cfea04e22b..79517bd4418f 100644
--- a/drivers/gpu/drm/drm_print.c
+++ b/drivers/gpu/drm/drm_print.c
@@ -390,3 +390,26 @@ void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset)
 	}
 }
 EXPORT_SYMBOL(drm_print_regset32);
+
+/**
+ * drm_print_hex_dump - print a hex dump to a &drm_printer stream
+ * @p: The &drm_printer
+ * @prefix: Prefix for each line, may be NULL for no prefix
+ * @buf: Buffer to dump
+ * @len: Length of buffer
+ *
+ * Print hex dump to &drm_printer, with 16 space-separated hex bytes per line,
+ * optionally with a prefix on each line. No separator is added after prefix.
+ */
+void drm_print_hex_dump(struct drm_printer *p, const char *prefix,
+			const u8 *buf, size_t len)
+{
+	int i;
+
+	for (i = 0; i < len; i += 16) {
+		int bytes_per_line = min(16, len - i);
+
+		drm_printf(p, "%s%*ph\n", prefix ?: "", bytes_per_line, buf + i);
+	}
+}
+EXPORT_SYMBOL(drm_print_hex_dump);
diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
index b3906dc04388..f77fe1531cf8 100644
--- a/include/drm/drm_print.h
+++ b/include/drm/drm_print.h
@@ -199,6 +199,8 @@ void drm_puts(struct drm_printer *p, const char *str);
 void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset);
 void drm_print_bits(struct drm_printer *p, unsigned long value,
 		    const char * const bits[], unsigned int nbits);
+void drm_print_hex_dump(struct drm_printer *p, const char *prefix,
+			const u8 *buf, size_t len);
 
 __printf(2, 0)
 /**
-- 
2.39.5