drm/i915/guc: Update debugfs for GuC multi-lrc

Display the workqueue status in debugfs for GuC contexts that are in
parent-child relationship.

v2:
 (John Harrison)
  - Output number children in debugfs
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211014172005.27155-16-matthew.brost@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c

@@ -3702,15 +3702,9 @@ static inline void guc_log_context_priority(struct drm_printer *p,
 	drm_printf(p, "\n");
 }
 
-void intel_guc_submission_print_context_info(struct intel_guc *guc,
-					     struct drm_printer *p)
+static inline void guc_log_context(struct drm_printer *p,
+				   struct intel_context *ce)
 {
-	struct intel_context *ce;
-	unsigned long index;
-	unsigned long flags;
-
-	xa_lock_irqsave(&guc->context_lookup, flags);
-	xa_for_each(&guc->context_lookup, index, ce) {
 	drm_printf(p, "GuC lrc descriptor %u:\n", ce->guc_id.id);
 	drm_printf(p, "\tHW Context Desc: 0x%08x\n", ce->lrc.lrca);
 	drm_printf(p, "\t\tLRC Head: Internal %u, Memory %u\n",
@@ -3725,8 +3719,38 @@ void intel_guc_submission_print_context_info(struct intel_guc *guc,
 		   atomic_read(&ce->guc_id.ref));
 	drm_printf(p, "\t\tSchedule State: 0x%x\n\n",
 		   ce->guc_state.sched_state);
+}
 
+void intel_guc_submission_print_context_info(struct intel_guc *guc,
+					     struct drm_printer *p)
+{
+	struct intel_context *ce;
+	unsigned long index;
+	unsigned long flags;
+
+	xa_lock_irqsave(&guc->context_lookup, flags);
+	xa_for_each(&guc->context_lookup, index, ce) {
+		GEM_BUG_ON(intel_context_is_child(ce));
+
+		guc_log_context(p, ce);
 		guc_log_context_priority(p, ce);
+
+		if (intel_context_is_parent(ce)) {
+			struct guc_process_desc *desc = __get_process_desc(ce);
+			struct intel_context *child;
+
+			drm_printf(p, "\t\tNumber children: %u\n",
+				   ce->parallel.number_children);
+			drm_printf(p, "\t\tWQI Head: %u\n",
+				   READ_ONCE(desc->head));
+			drm_printf(p, "\t\tWQI Tail: %u\n",
+				   READ_ONCE(desc->tail));
+			drm_printf(p, "\t\tWQI Status: %u\n\n",
+				   READ_ONCE(desc->wq_status));
+
+			for_each_child(ce, child)
+				guc_log_context(p, child);
+		}
 	}
 	xa_unlock_irqrestore(&guc->context_lookup, flags);
 }