[PATCH v3 2/4] drm/xe/sysctrl: Add sysctrl debugfs infrastructure

From: Anoop Vijay <[email protected]>

Add basic debugfs support for sysctrl. This patch adds necessary
types and registration hooks.

Changes:
- Add debugfs structure to xe_sysctrl_types.h
- Add xe_sysctrl_debugfs.h header
- Add xe_sysctrl_debugfs_register() stub
- Wire up sysctrl debugfs registration

No functional changes, debugfs directory created but empty.

Signed-off-by: Anoop Vijay <[email protected]>
---
 drivers/gpu/drm/xe/Makefile             |  1 +
 drivers/gpu/drm/xe/xe_debugfs.c         |  5 +++++
 drivers/gpu/drm/xe/xe_sysctrl_debugfs.c | 27 +++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_sysctrl_debugfs.h | 14 +++++++++++++
 drivers/gpu/drm/xe/xe_sysctrl_types.h   |  7 +++++++
 5 files changed, 54 insertions(+)
 create mode 100644 drivers/gpu/drm/xe/xe_sysctrl_debugfs.c
 create mode 100644 drivers/gpu/drm/xe/xe_sysctrl_debugfs.h

diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 44ed055439d4..f083451608ff 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -127,6 +127,7 @@ xe-y += xe_bb.o \
 	xe_survivability_mode.o \
 	xe_sync.o \
 	xe_sysctrl.o \
+	xe_sysctrl_debugfs.o \
 	xe_sysctrl_event.o \
 	xe_sysctrl_mailbox.o \
 	xe_tile.o \
diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index 8de78cd0aa03..666290d83bfe 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -30,6 +30,8 @@
 #include "xe_sriov_pf_debugfs.h"
 #include "xe_sriov_vf.h"
 #include "xe_step.h"
+#include "xe_sysctrl.h"
+#include "xe_sysctrl_debugfs.h"
 #include "xe_tile_debugfs.h"
 #include "xe_vsec.h"
 #include "xe_wa.h"
@@ -770,6 +772,9 @@ void xe_debugfs_register(struct xe_device *xe)
 
 	xe_fault_inject_debugfs_register(xe, root);
 
+	if (xe->info.has_sysctrl)
+		xe_sysctrl_debugfs_register(&xe->sc, root);
+
 	if (IS_SRIOV_PF(xe))
 		xe_sriov_pf_debugfs_register(xe, root);
 	else if (IS_SRIOV_VF(xe))
diff --git a/drivers/gpu/drm/xe/xe_sysctrl_debugfs.c b/drivers/gpu/drm/xe/xe_sysctrl_debugfs.c
new file mode 100644
index 000000000000..0238ff093831
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_sysctrl_debugfs.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2026 Intel Corporation
+ */
+
+#include <linux/debugfs.h>
+
+#include "xe_device.h"
+#include "xe_sysctrl.h"
+#include "xe_sysctrl_debugfs.h"
+#include "xe_sysctrl_types.h"
+
+/**
+ * xe_sysctrl_debugfs_register - Register debugfs entries for System Controller
+ * @sc: xe_sysctrl instance
+ * @parent: parent debugfs directory
+ */
+void xe_sysctrl_debugfs_register(struct xe_sysctrl *sc, struct dentry *parent)
+{
+	struct dentry *root;
+
+	root = debugfs_create_dir("sc", parent);
+	if (IS_ERR(root))
+		return;
+
+	sc->debugfs.root = root;
+}
diff --git a/drivers/gpu/drm/xe/xe_sysctrl_debugfs.h b/drivers/gpu/drm/xe/xe_sysctrl_debugfs.h
new file mode 100644
index 000000000000..d1414ac3562e
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_sysctrl_debugfs.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2026 Intel Corporation
+ */
+
+#ifndef _XE_SYSCTRL_DEBUGFS_H_
+#define _XE_SYSCTRL_DEBUGFS_H_
+
+struct dentry;
+struct xe_sysctrl;
+
+void xe_sysctrl_debugfs_register(struct xe_sysctrl *sc, struct dentry *parent);
+
+#endif
diff --git a/drivers/gpu/drm/xe/xe_sysctrl_types.h b/drivers/gpu/drm/xe/xe_sysctrl_types.h
index 66ba24f43017..d50a35fefb7a 100644
--- a/drivers/gpu/drm/xe/xe_sysctrl_types.h
+++ b/drivers/gpu/drm/xe/xe_sysctrl_types.h
@@ -11,6 +11,7 @@
 #include <linux/workqueue_types.h>
 
 struct xe_mmio;
+struct dentry;
 
 /**
  * struct xe_sysctrl - System Controller driver context
@@ -34,6 +35,12 @@ struct xe_sysctrl {
 
 	/** @event_lock: Mutex protecting pending events */
 	struct mutex event_lock;
+
+	/** @debugfs: Debugfs entries */
+	struct {
+		/** @debugfs.root: Root debugfs directory */
+		struct dentry *root;
+	} debugfs;
 };
 
 #endif
-- 
2.43.0