drm/xe: Make local functions static

A few static functions not being declared like that break the build with
W=1, like e.g.

	cc1: all warnings being treated as errors
	make[2]: *** [../scripts/Makefile.build:250: drivers/gpu/drm/xe/xe_gt.o] Error 1
	../drivers/gpu/drm/xe/xe_guc.c:240:6: error: no previous prototype for ‘guc_write_params’ [-Werror=missing-prototypes]
	  240 | void guc_write_params(struct xe_guc *guc)
	      |      ^~~~~~~~~~~~~~~~

Make them static.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_gt.c

@@ -218,7 +218,7 @@ static void gt_fini(struct drm_device *drm, void *arg)
 
 static void gt_reset_worker(struct work_struct *w);
 
-int emit_nop_job(struct xe_gt *gt, struct xe_engine *e)
+static int emit_nop_job(struct xe_gt *gt, struct xe_engine *e)
 {
 	struct xe_sched_job *job;
 	struct xe_bb *bb;
@@ -252,7 +252,7 @@ int emit_nop_job(struct xe_gt *gt, struct xe_engine *e)
 	return 0;
 }
 
-int emit_wa_job(struct xe_gt *gt, struct xe_engine *e)
+static int emit_wa_job(struct xe_gt *gt, struct xe_engine *e)
 {
 	struct xe_reg_sr *sr = &e->hwe->reg_lrc;
 	struct xe_reg_sr_entry *entry;
@@ -609,7 +609,7 @@ int xe_gt_init(struct xe_gt *gt)
 	return 0;
 }
 
-int do_gt_reset(struct xe_gt *gt)
+static int do_gt_reset(struct xe_gt *gt)
 {
 	struct xe_device *xe = gt_to_xe(gt);
 	int err;

drivers/gpu/drm/xe/xe_guc.c

@@ -237,7 +237,7 @@ static void guc_init_params(struct xe_guc *guc)
  * transfer. These parameters are read by the firmware on startup
  * and cannot be changed thereafter.
  */
-void guc_write_params(struct xe_guc *guc)
+static void guc_write_params(struct xe_guc *guc)
 {
 	struct xe_gt *gt = guc_to_gt(guc);
 	int i;
@@ -560,7 +560,7 @@ static void guc_handle_mmio_msg(struct xe_guc *guc)
 			"Received early GuC exception notification!\n");
 }
 
-void guc_enable_irq(struct xe_guc *guc)
+static void guc_enable_irq(struct xe_guc *guc)
 {
 	struct xe_gt *gt = guc_to_gt(guc);
 	u32 events = xe_gt_is_media_type(gt) ?

drivers/gpu/drm/xe/xe_irq.c

@@ -448,7 +448,7 @@ static void dg1_irq_reset(struct xe_gt *gt)
 	GEN3_IRQ_RESET(gt, GEN8_PCU_);
 }
 
-void xe_irq_reset(struct xe_device *xe)
+static void xe_irq_reset(struct xe_device *xe)
 {
 	struct xe_gt *gt;
 	u8 id;

drivers/gpu/drm/xe/xe_wait_user_fence.c

@@ -56,7 +56,7 @@ static const enum xe_engine_class user_to_xe_engine_class[] = {
 	[DRM_XE_ENGINE_CLASS_COMPUTE] = XE_ENGINE_CLASS_COMPUTE,
 };
 
-int check_hw_engines(struct xe_device *xe,
+static int check_hw_engines(struct xe_device *xe,
 			    struct drm_xe_engine_class_instance *eci,
 			    int num_engines)
 {