drm/xe: Introduce xe_gt_dbg_printer()

We didn't have GT-oriented debug level printer as it was hard to
correctly show actual callsite annotation. But this is now doable
from commit c2ef66e9ad88 ("drm/print: Improve drm_dbg_printer").

Signed-off-by: Michal Wajdeczko <[e-mail]>
Reviewed-by: Lucas De Marchi <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Lucas De Marchi <[e-mail]>

drivers/gpu/drm/xe/xe_gt_printk.h

···
 	xe_gt_info(gt, "%pV", vaf);
 }
 
+static inline void __xe_gt_printfn_dbg(struct drm_printer *p, struct va_format *vaf)
+{
+	struct xe_gt *gt = p->arg;
+	struct drm_printer dbg;
+
+	/*
+	 * The original xe_gt_dbg() callsite annotations are useless here,
+	 * redirect to the tweaked drm_dbg_printer() instead.
+	 */
+	dbg = drm_dbg_printer(&gt_to_xe(gt)->drm, DRM_UT_DRIVER, NULL);
+	dbg.origin = p->origin;
+
+	drm_printf(&dbg, "GT%u: %pV", gt->info.id, vaf);
+}
+
 /**
  * xe_gt_err_printer - Construct a &drm_printer that outputs to xe_gt_err()
  * @gt: the &xe_gt pointer to use in xe_gt_err()
···
 	struct drm_printer p = {
 		.printfn = __xe_gt_printfn_info,
 		.arg = gt,
+	};
+	return p;
+}
+
+/**
+ * xe_gt_dbg_printer - Construct a &drm_printer that outputs like xe_gt_dbg()
+ * @gt: the &xe_gt pointer to use in xe_gt_dbg()
+ *
+ * Return: The &drm_printer object.
+ */
+static inline struct drm_printer xe_gt_dbg_printer(struct xe_gt *gt)
+{
+	struct drm_printer p = {
+		.printfn = __xe_gt_printfn_dbg,
+		.arg = gt,
+		.origin = (const void *)_THIS_IP_,
 	};
 	return p;
 }