diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index b4a6ac60e7c6..073bd0ac8f2a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3348,16 +3348,20 @@ static int i915_engine_info(struct seq_file *m, void *unused)
 
 			rcu_read_lock();
 			for (idx = 0; idx < execlists_num_ports(execlists); idx++) {
-				unsigned int count;
+				const struct execlist_port *port;
+				unsigned int count, n;
 
-				rq = port_unpack(&execlists->port[idx], &count);
+				port = execlists_port(execlists, idx);
+				n = port_index(port, execlists);
+
+				rq = port_unpack(port, &count);
 				if (rq) {
-					seq_printf(m, "\t\tELSP[%d] count=%d, ",
-						   idx, count);
+					seq_printf(m, "\t\tELSP[%d:%d] count=%d, ",
+						   idx, n, count);
 					print_request(m, rq, "rq: ");
 				} else {
-					seq_printf(m, "\t\tELSP[%d] idle\n",
-						   idx);
+					seq_printf(m, "\t\tELSP[%d:%d] idle\n",
+						   idx, n);
 				}
 			}
 			rcu_read_unlock();
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index c14552ab270b..9f2145c6961d 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1332,11 +1332,13 @@ static void engine_record_requests(struct intel_engine_cs *engine,
 static void error_record_engine_execlists(struct intel_engine_cs *engine,
 					  struct drm_i915_error_engine *ee)
 {
-	const struct intel_engine_execlists * const execlists = &engine->execlists;
+	struct intel_engine_execlists * const execlists = &engine->execlists;
 	unsigned int n;
 
 	for (n = 0; n < execlists_num_ports(execlists); n++) {
-		struct drm_i915_gem_request *rq = port_request(&execlists->port[n]);
+		struct drm_i915_gem_request *rq;
+
+		rq = port_request(execlists_port(execlists, n));
 
 		if (!rq)
 			break;
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 04f1281d81a5..c6cd05a5347c 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -562,8 +562,7 @@ static void i915_guc_dequeue(struct intel_engine_cs *engine)
 	struct intel_engine_execlists * const execlists = &engine->execlists;
 	struct execlist_port *port = execlists->port;
 	struct drm_i915_gem_request *last = NULL;
-	const struct execlist_port * const last_port =
-		&execlists->port[execlists->port_mask];
+	const struct execlist_port * const last_port = execlists_port_tail(execlists);
 	bool submit = false;
 	struct rb_node *rb;
 
@@ -587,7 +586,8 @@ static void i915_guc_dequeue(struct intel_engine_cs *engine)
 
 				if (submit)
 					port_assign(port, last);
-				port++;
+
+				port = execlists_port_next(execlists, port);
 			}
 
 			INIT_LIST_HEAD(&rq->priotree.link);
@@ -618,19 +618,18 @@ static void i915_guc_irq_handler(unsigned long data)
 {
 	struct intel_engine_cs * const engine = (struct intel_engine_cs *)data;
 	struct intel_engine_execlists * const execlists = &engine->execlists;
-	struct execlist_port *port = execlists->port;
-	const struct execlist_port * const last_port =
-		&execlists->port[execlists->port_mask];
+	struct execlist_port *port = execlists_port_head(execlists);
+	const struct execlist_port * const last_port = execlists_port_tail(execlists);
 	struct drm_i915_gem_request *rq;
 
-	rq = port_request(&port[0]);
+	rq = port_request(port);
 	while (rq && i915_gem_request_completed(rq)) {
 		trace_i915_gem_request_out(rq);
 		i915_gem_request_put(rq);
 
-		execlists_port_complete(execlists, port);
+		port = execlists_port_complete(execlists, port);
 
-		rq = port_request(&port[0]);
+		rq = port_request(port);
 	}
 
 	if (!port_isset(last_port))
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index efd7827ff181..b9d1f379c5a0 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1382,7 +1382,7 @@ gen8_cs_irq_handler(struct intel_engine_cs *engine, u32 iir, int test_shift)
 	bool tasklet = false;
 
 	if (iir & (GT_CONTEXT_SWITCH_INTERRUPT << test_shift)) {
-		if (port_count(&execlists->port[0])) {
+		if (port_count(execlists_port_head(execlists))) {
 			__set_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted);
 			tasklet = true;
 		}
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index a28e2a864cf1..3f857786e2ed 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1505,7 +1505,7 @@ bool intel_engine_is_idle(struct intel_engine_cs *engine)
 		return false;
 
 	/* Both ports drained, no more ELSP submission? */
-	if (port_request(&engine->execlists.port[0]))
+	if (port_request(execlists_port_head(&engine->execlists)))
 		return false;
 
 	/* ELSP is empty, but there are ready requests? */
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 61cac26a8b05..cb7fb3c651ce 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -394,24 +394,26 @@ static u64 execlists_update_context(struct drm_i915_gem_request *rq)
 
 static void execlists_submit_ports(struct intel_engine_cs *engine)
 {
-	struct execlist_port *port = engine->execlists.port;
+	struct intel_engine_execlists * const execlists = &engine->execlists;
 	u32 __iomem *elsp =
 		engine->i915->regs + i915_mmio_reg_offset(RING_ELSP(engine));
 	unsigned int n;
 
-	for (n = execlists_num_ports(&engine->execlists); n--; ) {
+	for (n = execlists_num_ports(execlists); n--; ) {
+		struct execlist_port *port;
 		struct drm_i915_gem_request *rq;
 		unsigned int count;
 		u64 desc;
 
-		rq = port_unpack(&port[n], &count);
+		port = execlists_port(execlists, n);
+		rq = port_unpack(port, &count);
 		if (rq) {
 			GEM_BUG_ON(count > !n);
 			if (!count++)
 				execlists_context_status_change(rq, INTEL_CONTEXT_SCHEDULE_IN);
-			port_set(&port[n], port_pack(rq, count));
+			port_set(port, port_pack(rq, count));
 			desc = execlists_update_context(rq);
-			GEM_DEBUG_EXEC(port[n].context_id = upper_32_bits(desc));
+			GEM_DEBUG_EXEC(port->context_id = upper_32_bits(desc));
 		} else {
 			GEM_BUG_ON(!n);
 			desc = 0;
@@ -455,9 +457,8 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
 {
 	struct drm_i915_gem_request *last;
 	struct intel_engine_execlists * const execlists = &engine->execlists;
-	struct execlist_port *port = execlists->port;
-	const struct execlist_port * const last_port =
-		&execlists->port[execlists->port_mask];
+	struct execlist_port *port = execlists_port_head(execlists);
+	const struct execlist_port * const last_port = execlists_port_tail(execlists);
 	struct rb_node *rb;
 	bool submit = false;
 
@@ -541,7 +542,8 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
 
 				if (submit)
 					port_assign(port, last);
-				port++;
+
+				port = execlists_port_next(execlists, port);
 
 				GEM_BUG_ON(port_isset(port));
 			}
@@ -572,7 +574,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
 }
 
 static void
-execlist_cancel_port_requests(struct intel_engine_execlists *execlists)
+execlists_cancel_port_requests(struct intel_engine_execlists *execlists)
 {
 	struct execlist_port *port = execlists->port;
 	unsigned int num_ports = ARRAY_SIZE(execlists->port);
@@ -598,7 +600,7 @@ static void execlists_cancel_requests(struct intel_engine_cs *engine)
 	spin_lock_irqsave(&engine->timeline->lock, flags);
 
 	/* Cancel the requests on the HW and clear the ELSP tracker. */
-	execlist_cancel_port_requests(execlists);
+	execlists_cancel_port_requests(execlists);
 
 	/* Mark all executing requests as skipped. */
 	list_for_each_entry(rq, &engine->timeline->requests, link) {
@@ -645,11 +647,12 @@ static void execlists_cancel_requests(struct intel_engine_cs *engine)
 	spin_unlock_irqrestore(&engine->timeline->lock, flags);
 }
 
-static bool execlists_elsp_ready(const struct intel_engine_cs *engine)
+static bool execlists_elsp_ready(struct intel_engine_execlists * const execlists)
 {
-	const struct execlist_port *port = engine->execlists.port;
+	struct execlist_port * const port0 = execlists_port_head(execlists);
+	struct execlist_port * const port1 = execlists_port_next(execlists, port0);
 
-	return port_count(&port[0]) + port_count(&port[1]) < 2;
+	return port_count(port0) + port_count(port1) < 2;
 }
 
 /*
@@ -660,7 +663,7 @@ static void intel_lrc_irq_handler(unsigned long data)
 {
 	struct intel_engine_cs * const engine = (struct intel_engine_cs *)data;
 	struct intel_engine_execlists * const execlists = &engine->execlists;
-	struct execlist_port *port = execlists->port;
+	struct execlist_port *port = execlists_port_head(execlists);
 	struct drm_i915_private *dev_priv = engine->i915;
 
 	/* We can skip acquiring intel_runtime_pm_get() here as it was taken
@@ -758,7 +761,7 @@ static void intel_lrc_irq_handler(unsigned long data)
 				trace_i915_gem_request_out(rq);
 				i915_gem_request_put(rq);
 
-				execlists_port_complete(execlists, port);
+				port = execlists_port_complete(execlists, port);
 			} else {
 				port_set(port, port_pack(rq, count));
 			}
@@ -775,7 +778,7 @@ static void intel_lrc_irq_handler(unsigned long data)
 		}
 	}
 
-	if (execlists_elsp_ready(engine))
+	if (execlists_elsp_ready(execlists))
 		execlists_dequeue(engine);
 
 	intel_uncore_forcewake_put(dev_priv, execlists->fw_domains);
@@ -785,16 +788,18 @@ static void insert_request(struct intel_engine_cs *engine,
 			   struct i915_priotree *pt,
 			   int prio)
 {
+	struct intel_engine_execlists * const execlists = &engine->execlists;
 	struct i915_priolist *p = lookup_priolist(engine, pt, prio);
 
 	list_add_tail(&pt->link, &ptr_mask_bits(p, 1)->requests);
-	if (ptr_unmask_bits(p, 1) && execlists_elsp_ready(engine))
-		tasklet_hi_schedule(&engine->execlists.irq_tasklet);
+	if (ptr_unmask_bits(p, 1) && execlists_elsp_ready(execlists))
+		tasklet_hi_schedule(&execlists->irq_tasklet);
 }
 
 static void execlists_submit_request(struct drm_i915_gem_request *request)
 {
 	struct intel_engine_cs *engine = request->engine;
+	struct intel_engine_execlists * const execlists = &engine->execlists;
 	unsigned long flags;
 
 	/* Will be called from irq-context when using foreign fences. */
@@ -802,7 +807,7 @@ static void execlists_submit_request(struct drm_i915_gem_request *request)
 
 	insert_request(engine, &request->priotree, request->priotree.priority);
 
-	GEM_BUG_ON(!engine->execlists.first);
+	GEM_BUG_ON(!execlists->first);
 	GEM_BUG_ON(list_empty(&request->priotree.link));
 
 	spin_unlock_irqrestore(&engine->timeline->lock, flags);
@@ -1397,7 +1402,7 @@ static void reset_common_ring(struct intel_engine_cs *engine,
 	 * guessing the missed context-switch events by looking at what
 	 * requests were completed.
 	 */
-	execlist_cancel_port_requests(execlists);
+	execlists_cancel_port_requests(execlists);
 
 	/* Push back any incomplete requests for replay after the reset. */
 	list_for_each_entry_safe_reverse(rq, rn,
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 56d7ae9f298b..2e795b44a942 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -244,6 +244,11 @@ struct intel_engine_execlists {
 	unsigned int port_mask;
 
 	/**
+	 * @port_head: first used execlist port
+	 */
+	unsigned int port_head;
+
+	/**
 	 * @queue: queue of requests, in priority lists
 	 */
 	struct rb_root queue;
@@ -524,16 +529,47 @@ execlists_num_ports(const struct intel_engine_execlists * const execlists)
 	return execlists->port_mask + 1;
 }
 
-static inline void
+#define __port_n(start, n, mask) (((start) + (n)) & (mask))
+#define port_n(e, n) __port_n((e)->port_head, n, (e)->port_mask)
+
+/* Index starting from port_head */
+static inline struct execlist_port *
+execlists_port(struct intel_engine_execlists * const execlists,
+	       const unsigned int n)
+{
+	return &execlists->port[port_n(execlists, n)];
+}
+
+static inline struct execlist_port *
+execlists_port_head(struct intel_engine_execlists * const execlists)
+{
+	return execlists_port(execlists, 0);
+}
+
+static inline struct execlist_port *
+execlists_port_tail(struct intel_engine_execlists * const execlists)
+{
+	return execlists_port(execlists, -1);
+}
+
+static inline struct execlist_port *
+execlists_port_next(struct intel_engine_execlists * const execlists,
+		    const struct execlist_port * const port)
+{
+	const unsigned int n = port_index(port, execlists);
+
+	return execlists_port(execlists, n + 1);
+}
+
+static inline struct execlist_port *
 execlists_port_complete(struct intel_engine_execlists * const execlists,
 			struct execlist_port * const port)
 {
-	const unsigned int m = execlists->port_mask;
-
-	GEM_BUG_ON(port_index(port, execlists) != 0);
+	GEM_BUG_ON(port_index(port, execlists) != execlists->port_head);
 
-	memmove(port, port + 1, m * sizeof(struct execlist_port));
-	memset(port + m, 0, sizeof(struct execlist_port));
+	memset(port, 0, sizeof(struct execlist_port));
+	execlists->port_head = port_n(execlists, 1);
+	return execlists_port_head(execlists);
 }
 
 static inline unsigned int
