drm/xe/soc_remapper: Initialize SoC remapper during Xe probe

SoC remapper is used to map different HW functions in the SoC to their
respective drivers. Initialize SoC remapper during driver load.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Badal Nilawar <badal.nilawar@intel.com>
Link: https://patch.msgid.link/20251223183943.3175941-6-umesh.nerlige.ramappa@intel.com

Author: unerlige

drivers/gpu/drm/xe/Makefile

@@ -116,6 +116,7 @@ xe-y += xe_bb.o \
 	xe_sa.o \
 	xe_sched_job.o \
 	xe_shrinker.o \
+	xe_soc_remapper.o \
 	xe_step.o \
 	xe_survivability_mode.o \
 	xe_sync.o \

drivers/gpu/drm/xe/xe_device.c

@@ -62,6 +62,7 @@
 #include "xe_pxp.h"
 #include "xe_query.h"
 #include "xe_shrinker.h"
+#include "xe_soc_remapper.h"
 #include "xe_survivability_mode.h"
 #include "xe_sriov.h"
 #include "xe_svm.h"
@@ -989,6 +990,10 @@ int xe_device_probe(struct xe_device *xe)
 
 	xe_nvm_init(xe);
 
+	err = xe_soc_remapper_init(xe);
+	if (err)
+		return err;
+
 	err = xe_heci_gsc_init(xe);
 	if (err)
 		return err;

drivers/gpu/drm/xe/xe_device_types.h

@@ -578,6 +578,12 @@ struct xe_device {
 		struct mutex lock;
 	} pmt;
 
+	/** @soc_remapper: SoC remapper object */
+	struct {
+		/** @soc_remapper.lock: Serialize access to SoC Remapper's index registers */
+		spinlock_t lock;
+	} soc_remapper;
+
 	/**
 	 * @pm_callback_task: Track the active task that is running in either
 	 * the runtime_suspend or runtime_resume callbacks.

drivers/gpu/drm/xe/xe_soc_remapper.c

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#include "xe_soc_remapper.h"
+
+/**
+ * xe_soc_remapper_init() - Initialize SoC remapper
+ * @xe: Pointer to xe device.
+ *
+ * Initialize SoC remapper.
+ *
+ * Return: 0 on success, error code on failure
+ */
+int xe_soc_remapper_init(struct xe_device *xe)
+{
+	spin_lock_init(&xe->soc_remapper.lock);
+
+	return 0;
+}

drivers/gpu/drm/xe/xe_soc_remapper.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#ifndef _XE_SOC_REMAPPER_H_
+#define _XE_SOC_REMAPPER_H_
+
+#include "xe_device_types.h"
+
+int xe_soc_remapper_init(struct xe_device *xe);
+
+#endif