drm/xe: Allow to compile out debugfs

Use a dummy xe_debugfs_register() if debugfs is not enabled and move all
debugfs-related files under `ifeq ($(CONFIG_DEBUG_FS),y)` in the
Makefile. This is similar to what was done for display in
commit 439987f6 ("drm/xe: don't build debugfs files when
CONFIG_DEBUG_FS=n").

This removes the following warning while loading xe with
CONFIG_DEUBG_FS=n:

	xe 0000:03:00.0: [drm] Create GT directory failed
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240808171121.2484237-1-lucas.demarchi@intel.comSigned-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/xe/Makefile

@@ -28,7 +28,6 @@ $(obj)/generated/%_wa_oob.c $(obj)/generated/%_wa_oob.h: $(obj)/xe_gen_wa_oob \
 xe-y += xe_bb.o \
 	xe_bo.o \
 	xe_bo_evict.o \
-	xe_debugfs.o \
 	xe_devcoredump.o \
 	xe_device.o \
 	xe_device_sysfs.o \
@@ -46,7 +45,6 @@ xe-y += xe_bb.o \
 	xe_gt.o \
 	xe_gt_ccs_mode.o \
 	xe_gt_clock.o \
-	xe_gt_debugfs.o \
 	xe_gt_freq.o \
 	xe_gt_idle.o \
 	xe_gt_mcr.o \
@@ -59,7 +57,6 @@ xe-y += xe_bb.o \
 	xe_guc_ads.o \
 	xe_guc_ct.o \
 	xe_guc_db_mgr.o \
-	xe_guc_debugfs.o \
 	xe_guc_hwconfig.o \
 	xe_guc_id_mgr.o \
 	xe_guc_klv_helpers.o \
@@ -71,7 +68,6 @@ xe-y += xe_bb.o \
 	xe_hw_engine_class_sysfs.o \
 	xe_hw_fence.o \
 	xe_huc.o \
-	xe_huc_debugfs.o \
 	xe_irq.o \
 	xe_lrc.o \
 	xe_migrate.o \
@@ -107,7 +103,6 @@ xe-y += xe_bb.o \
 	xe_ttm_vram_mgr.o \
 	xe_tuning.o \
 	xe_uc.o \
-	xe_uc_debugfs.o \
 	xe_uc_fw.o \
 	xe_vm.o \
 	xe_vram.o \
@@ -124,7 +119,6 @@ xe-$(CONFIG_HWMON) += xe_hwmon.o
 # graphics virtualization (SR-IOV) support
 xe-y += \
 	xe_gt_sriov_vf.o \
-	xe_gt_sriov_vf_debugfs.o \
 	xe_guc_relay.o \
 	xe_memirq.o \
 	xe_sriov.o
@@ -133,7 +127,6 @@ xe-$(CONFIG_PCI_IOV) += \
 	xe_gt_sriov_pf.o \
 	xe_gt_sriov_pf_config.o \
 	xe_gt_sriov_pf_control.o \
-	xe_gt_sriov_pf_debugfs.o \
 	xe_gt_sriov_pf_monitor.o \
 	xe_gt_sriov_pf_policy.o \
 	xe_gt_sriov_pf_service.o \
@@ -281,6 +274,15 @@ ifeq ($(CONFIG_DRM_FBDEV_EMULATION),y)
 endif
 
 ifeq ($(CONFIG_DEBUG_FS),y)
+	xe-y += xe_debugfs.o \
+		xe_gt_debugfs.o \
+		xe_gt_sriov_vf_debugfs.o \
+		xe_guc_debugfs.o \
+		xe_huc_debugfs.o \
+		xe_uc_debugfs.o
+
+	xe-$(CONFIG_PCI_IOV) += xe_gt_sriov_pf_debugfs.o
+
 	xe-$(CONFIG_DRM_XE_DISPLAY) += \
 		i915-display/intel_display_debugfs.o \
 		i915-display/intel_display_debugfs_params.o \

drivers/gpu/drm/xe/xe_debugfs.h

@@ -8,6 +8,10 @@
 
 struct xe_device;
 
+#ifdef CONFIG_DEBUG_FS
 void xe_debugfs_register(struct xe_device *xe);
+#else
+static inline void xe_debugfs_register(struct xe_device *xe) { }
+#endif
 
 #endif