drm/i915/pmu: Add a name to the execlists stats

In preparation for GuC pmu stats, add a name to the execlists stats
structure so that it can be differentiated from the GuC stats.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211027004821.66097-1-umesh.nerlige.ramappa@intel.com

drivers/gpu/drm/i915/gt/intel_engine_cs.c

@@ -363,7 +363,7 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id,
 		DRIVER_CAPS(i915)->has_logical_contexts = true;
 
 	ewma__engine_latency_init(&engine->latency);
-	seqcount_init(&engine->stats.lock);
+	seqcount_init(&engine->stats.execlists.lock);
 
 	ATOMIC_INIT_NOTIFIER_HEAD(&engine->context_status_notifier);
 
@@ -1918,15 +1918,16 @@ void intel_engine_dump(struct intel_engine_cs *engine,
 static ktime_t __intel_engine_get_busy_time(struct intel_engine_cs *engine,
 					    ktime_t *now)
 {
-	ktime_t total = engine->stats.total;
+	struct intel_engine_execlists_stats *stats = &engine->stats.execlists;
+	ktime_t total = stats->total;
 
 	/*
 	 * If the engine is executing something at the moment
 	 * add it to the total.
 	 */
 	*now = ktime_get();
-	if (READ_ONCE(engine->stats.active))
+	if (READ_ONCE(stats->active))
-		total = ktime_add(total, ktime_sub(*now, engine->stats.start));
+		total = ktime_add(total, ktime_sub(*now, stats->start));
 
 	return total;
 }
@@ -1940,13 +1941,14 @@ static ktime_t __intel_engine_get_busy_time(struct intel_engine_cs *engine,
  */
 ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine, ktime_t *now)
 {
+	struct intel_engine_execlists_stats *stats = &engine->stats.execlists;
 	unsigned int seq;
 	ktime_t total;
 
 	do {
-		seq = read_seqcount_begin(&engine->stats.lock);
+		seq = read_seqcount_begin(&stats->lock);
 		total = __intel_engine_get_busy_time(engine, now);
-	} while (read_seqcount_retry(&engine->stats.lock, seq));
+	} while (read_seqcount_retry(&stats->lock, seq));
 
 	return total;
 }

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

@@ -15,45 +15,46 @@
 
 static inline void intel_engine_context_in(struct intel_engine_cs *engine)
 {
+	struct intel_engine_execlists_stats *stats = &engine->stats.execlists;
 	unsigned long flags;
 
-	if (engine->stats.active) {
+	if (stats->active) {
-		engine->stats.active++;
+		stats->active++;
 		return;
 	}
 
 	/* The writer is serialised; but the pmu reader may be from hardirq */
 	local_irq_save(flags);
-	write_seqcount_begin(&engine->stats.lock);
+	write_seqcount_begin(&stats->lock);
 
-	engine->stats.start = ktime_get();
+	stats->start = ktime_get();
-	engine->stats.active++;
+	stats->active++;
 
-	write_seqcount_end(&engine->stats.lock);
+	write_seqcount_end(&stats->lock);
 	local_irq_restore(flags);
 
-	GEM_BUG_ON(!engine->stats.active);
+	GEM_BUG_ON(!stats->active);
 }
 
 static inline void intel_engine_context_out(struct intel_engine_cs *engine)
 {
+	struct intel_engine_execlists_stats *stats = &engine->stats.execlists;
 	unsigned long flags;
 
-	GEM_BUG_ON(!engine->stats.active);
+	GEM_BUG_ON(!stats->active);
-	if (engine->stats.active > 1) {
+	if (stats->active > 1) {
-		engine->stats.active--;
+		stats->active--;
 		return;
 	}
 
 	local_irq_save(flags);
-	write_seqcount_begin(&engine->stats.lock);
+	write_seqcount_begin(&stats->lock);
 
-	engine->stats.active--;
+	stats->active--;
-	engine->stats.total =
+	stats->total = ktime_add(stats->total,
-		ktime_add(engine->stats.total,
+				 ktime_sub(ktime_get(), stats->start));
-			  ktime_sub(ktime_get(), engine->stats.start));
 
-	write_seqcount_end(&engine->stats.lock);
+	write_seqcount_end(&stats->lock);
 	local_irq_restore(flags);
 }
 

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

@@ -257,6 +257,33 @@ struct intel_engine_execlists {
 
 #define INTEL_ENGINE_CS_MAX_NAME 8
 
+struct intel_engine_execlists_stats {
+	/**
+	 * @active: Number of contexts currently scheduled in.
+	 */
+	unsigned int active;
+
+	/**
+	 * @lock: Lock protecting the below fields.
+	 */
+	seqcount_t lock;
+
+	/**
+	 * @total: Total time this engine was busy.
+	 *
+	 * Accumulated time not counting the most recent block in cases where
+	 * engine is currently busy (active > 0).
+	 */
+	ktime_t total;
+
+	/**
+	 * @start: Timestamp of the last idle to active transition.
+	 *
+	 * Idle is defined as active == 0, active is active > 0.
+	 */
+	ktime_t start;
+};
+
 struct intel_engine_cs {
 	struct drm_i915_private *i915;
 	struct intel_gt *gt;
@@ -488,30 +515,7 @@ struct intel_engine_cs {
 	u32 (*get_cmd_length_mask)(u32 cmd_header);
 
 	struct {
-		/**
+		struct intel_engine_execlists_stats execlists;
-		 * @active: Number of contexts currently scheduled in.
-		 */
-		unsigned int active;
-
-		/**
-		 * @lock: Lock protecting the below fields.
-		 */
-		seqcount_t lock;
-
-		/**
-		 * @total: Total time this engine was busy.
-		 *
-		 * Accumulated time not counting the most recent block in cases
-		 * where engine is currently busy (active > 0).
-		 */
-		ktime_t total;
-
-		/**
-		 * @start: Timestamp of the last idle to active transition.
-		 *
-		 * Idle is defined as active == 0, active is active > 0.
-		 */
-		ktime_t start;
 
 		/**
 		 * @rps: Utilisation at last RPS sampling.