[PATCH 2/2] drm/i915: Move execlists port head instead of memmoving array

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

From: Mika Kuoppala <mika.kuoppala@intel.com>

As all our access to execlist ports are through head and tail
helpers, we can now move the head instead of memmoving the array.

Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
---
 drivers/gpu/drm/i915/intel_ringbuffer.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index cfec73400d0f..27f5c42ae7c8 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -573,12 +573,13 @@ static inline void
 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) != execlists->port_head);
+	GEM_BUG_ON(!port_isset(port));
 
-	GEM_BUG_ON(port_index(port, execlists) != 0);
+	port->request_count = NULL;
+	GEM_DEBUG_DECL(port->context_id = 0);
 
-	memmove(port, port + 1, m * sizeof(struct execlist_port));
-	memset(port + m, 0, sizeof(struct execlist_port));
+	execlists->port_head = port_head_add(execlists, 1);
 }
 
 static inline unsigned int
-- 
2.11.0

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