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

[Mika Kuoppala]

From: Mika Kuoppala <mika.kuoppala at 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.

v2: use memset (Chris)

Cc: Michał Winiarski <michal.winiarski at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_ringbuffer.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 17f1fb4ded89..6a3cb8e09ed6 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -685,13 +685,13 @@ static inline struct execlist_port *
 execlists_head_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);
+	GEM_BUG_ON(!port_isset(port));
 	GEM_BUG_ON(!execlists_is_active(execlists, EXECLISTS_ACTIVE_USER));
 
-	memmove(port, port + 1, m * sizeof(struct execlist_port));
-	memset(port + m, 0, sizeof(struct execlist_port));
+	memset(port, 0, sizeof(*port));
+
+	execlists->port_head = port_head_add(execlists, 1);
 
 	return execlists_port_head(execlists);
 }
-- 
2.11.0