Merge tag 'drm-intel-fixes-2024-12-18' of https://gitlab.freedesktop.org/drm/i915/kernel into drm-fixes

- Reset engine utilization buffer before registration (Umesh Nerlige Ramappa)
- Ensure busyness counter increases motonically (Umesh Nerlige Ramappa)
- Accumulate active runtime on gt reset (Umesh Nerlige Ramappa)

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Tvrtko Ursulin <tursulin@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/Z2LppUZudGKXwWjW@linux

Author: airlied

drivers/gpu/drm/i915/gt/intel_engine_types.h

@@ -343,6 +343,11 @@ struct intel_engine_guc_stats {
 	 * @start_gt_clk: GT clock time of last idle to active transition.
 	 */
 	u64 start_gt_clk;
+
+	/**
+	 * @total: The last value of total returned
+	 */
+	u64 total;
 };
 
 union intel_engine_tlb_inv_reg {

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

@@ -1243,6 +1243,21 @@ static void __get_engine_usage_record(struct intel_engine_cs *engine,
 	} while (++i < 6);
 }
 
+static void __set_engine_usage_record(struct intel_engine_cs *engine,
+				      u32 last_in, u32 id, u32 total)
+{
+	struct iosys_map rec_map = intel_guc_engine_usage_record_map(engine);
+
+#define record_write(map_, field_, val_) \
+	iosys_map_wr_field(map_, 0, struct guc_engine_usage_record, field_, val_)
+
+	record_write(&rec_map, last_switch_in_stamp, last_in);
+	record_write(&rec_map, current_context_index, id);
+	record_write(&rec_map, total_runtime, total);
+
+#undef record_write
+}
+
 static void guc_update_engine_gt_clks(struct intel_engine_cs *engine)
 {
 	struct intel_engine_guc_stats *stats = &engine->stats.guc;
@@ -1363,9 +1378,12 @@ static ktime_t guc_engine_busyness(struct intel_engine_cs *engine, ktime_t *now)
 		total += intel_gt_clock_interval_to_ns(gt, clk);
 	}
 
+	if (total > stats->total)
+		stats->total = total;
+
 	spin_unlock_irqrestore(&guc->timestamp.lock, flags);
 
-	return ns_to_ktime(total);
+	return ns_to_ktime(stats->total);
 }
 
 static void guc_enable_busyness_worker(struct intel_guc *guc)
@@ -1431,8 +1449,21 @@ static void __reset_guc_busyness_stats(struct intel_guc *guc)
 
 	guc_update_pm_timestamp(guc, &unused);
 	for_each_engine(engine, gt, id) {
+		struct intel_engine_guc_stats *stats = &engine->stats.guc;
+
 		guc_update_engine_gt_clks(engine);
-		engine->stats.guc.prev_total = 0;
+
+		/*
+		 * If resetting a running context, accumulate the active
+		 * time as well since there will be no context switch.
+		 */
+		if (stats->running) {
+			u64 clk = guc->timestamp.gt_stamp - stats->start_gt_clk;
+
+			stats->total_gt_clks += clk;
+		}
+		stats->prev_total = 0;
+		stats->running = 0;
 	}
 
 	spin_unlock_irqrestore(&guc->timestamp.lock, flags);
@@ -1543,13 +1574,19 @@ static void guc_timestamp_ping(struct work_struct *wrk)
 
 static int guc_action_enable_usage_stats(struct intel_guc *guc)
 {
+	struct intel_gt *gt = guc_to_gt(guc);
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
 	u32 offset = intel_guc_engine_usage_offset(guc);
 	u32 action[] = {
 		INTEL_GUC_ACTION_SET_ENG_UTIL_BUFF,
 		offset,
 		0,
 	};
 
+	for_each_engine(engine, gt, id)
+		__set_engine_usage_record(engine, 0, 0xffffffff, 0);
+
 	return intel_guc_send(guc, action, ARRAY_SIZE(action));
 }