[PATCH v2 02/13] drm/xe/guc: Prepare to print group KLVs

[Michal Wajdeczko <michal.wajdeczko@intel.com>]

Some future KLVs will be encoded as a group of nested KLVs. Prepare
our KLV printer function to handle such KLVs. List of known group
keys will be updated later, for now just prepare it for testing.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
---
 drivers/gpu/drm/xe/xe_guc_klv_helpers.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_klv_helpers.c b/drivers/gpu/drm/xe/xe_guc_klv_helpers.c
index 3169c7f1eebf..f672f4947768 100644
--- a/drivers/gpu/drm/xe/xe_guc_klv_helpers.c
+++ b/drivers/gpu/drm/xe/xe_guc_klv_helpers.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/bitfield.h>
+#include <kunit/static_stub.h>
 #include <drm/drm_print.h>
 
 #include "abi/guc_klvs_abi.h"
@@ -12,6 +13,12 @@
 
 #define make_u64(hi, lo) ((u64)((u64)(u32)(hi) << 32 | (u32)(lo)))
 
+static bool is_group_key(u16 key)
+{
+	KUNIT_STATIC_STUB_REDIRECT(is_group_key, key);
+	return false;
+}
+
 /**
  * xe_guc_klv_key_to_string - Convert KLV key into friendly name.
  * @key: the `GuC KLV`_ key
@@ -89,6 +96,17 @@ void xe_guc_klv_print_one(u16 key, u16 len, const u32 *value, struct drm_printer
 {
 	const char *name = xe_guc_klv_key_to_string(key);
 
+	if (is_group_key(key)) {
+		struct drm_printer gp = drm_line_printer(p, name, 0);
+
+		drm_printf(p, "{ key %#06x : group %u dwords } # %s\n",
+			   key, len, name);
+
+		/* print group recursively */
+		xe_guc_klv_print(value, len, &gp);
+		return;
+	}
+
 	switch (len) {
 	case 0:
 		drm_printf(p, "{ key %#06x : no value } # %s\n", key, name);
-- 
2.47.1