[PATCH 1/5] drm/xe: Add missing include guards to unprotected headers

[Shuicheng Lin <shuicheng.lin@intel.com>]

Two headers lack include guards entirely, which can cause duplicate
definition errors if they are included more than once (directly or
transitively).

Add standard _XE_<NAME>_H_ include guards to:
  - xe_dep_scheduler.h: forward declarations and function prototypes
  - xe_pcode_api.h: PCODE mailbox register definitions

No functional change.

Suggested-by: Nitin Gote <nitin.r.gote@intel.com>
Assisted-by: GitHub Copilot:claude-opus-4.6
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
---
 drivers/gpu/drm/xe/xe_dep_scheduler.h | 5 +++++
 drivers/gpu/drm/xe/xe_pcode_api.h     | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_dep_scheduler.h b/drivers/gpu/drm/xe/xe_dep_scheduler.h
index 853961eec64b..f314fb5d80f5 100644
--- a/drivers/gpu/drm/xe/xe_dep_scheduler.h
+++ b/drivers/gpu/drm/xe/xe_dep_scheduler.h
@@ -3,6 +3,9 @@
  * Copyright © 2025 Intel Corporation
  */
 
+#ifndef _XE_DEP_SCHEDULER_H_
+#define _XE_DEP_SCHEDULER_H_
+
 #include <linux/types.h>
 
 struct drm_sched_entity;
@@ -19,3 +22,5 @@ void xe_dep_scheduler_fini(struct xe_dep_scheduler *dep_scheduler);
 
 struct drm_sched_entity *
 xe_dep_scheduler_entity(struct xe_dep_scheduler *dep_scheduler);
+
+#endif
diff --git a/drivers/gpu/drm/xe/xe_pcode_api.h b/drivers/gpu/drm/xe/xe_pcode_api.h
index 85cc7478b787..b619030b9e17 100644
--- a/drivers/gpu/drm/xe/xe_pcode_api.h
+++ b/drivers/gpu/drm/xe/xe_pcode_api.h
@@ -3,6 +3,9 @@
  * Copyright © 2022 Intel Corporation
  */
 
+#ifndef _XE_PCODE_API_H_
+#define _XE_PCODE_API_H_
+
 /* Internal to xe_pcode */
 
 #include "regs/xe_reg_defs.h"
@@ -101,3 +104,5 @@
 #define BMG_PCIE_CAP			XE_REG(0x138340)
 #define   LINK_DOWNGRADE		REG_GENMASK(1, 0)
 #define     DOWNGRADE_CAPABLE		2
+
+#endif
-- 
2.43.0