[PATCH 37/62] drm/i915/ringbuffer: Specialise SNB+ request emission for semaphores

[Chris Wilson]

As gen6_emit_request() only differs from i9xx_emit_request() when
semaphores are enabled, only use the specialised vfunc in that scenario.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 965349af425e..8830de0e60c8 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1446,22 +1446,20 @@ static int i9xx_emit_request(struct drm_i915_gem_request *req)
 }
 
 /**
- * gen6_emit_request - Update the semaphore mailbox registers
+ * gen6_sema_emit_request - Update the semaphore mailbox registers
  *
  * @request - request to write to the ring
  *
  * Update the mailbox registers in the *other* rings with the current seqno.
  * This acts like a signal in the canonical semaphore.
  */
-static int gen6_emit_request(struct drm_i915_gem_request *req)
+static int gen6_sema_emit_request(struct drm_i915_gem_request *req)
 {
-	if (req->engine->semaphore.signal) {
-		int ret;
+	int ret;
 
-		ret = req->engine->semaphore.signal(req);
-		if (ret)
-			return ret;
-	}
+	ret = req->engine->semaphore.signal(req);
+	if (ret)
+		return ret;
 
 	return i9xx_emit_request(req);
 }
@@ -2700,6 +2698,8 @@ static void intel_ring_init_semaphores(struct drm_i915_private *dev_priv,
 	if (!i915.semaphores)
 		return;
 
+	engine->emit_request = gen6_sema_emit_request;
+
 	if (INTEL_GEN(dev_priv) >= 8) {
 		u64 offset = i915_gem_obj_ggtt_offset(dev_priv->semaphore_obj);
 
@@ -2798,11 +2798,8 @@ static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
 				      struct intel_engine_cs *engine)
 {
 	engine->init_hw = init_ring_common;
-	engine->submit_request = i9xx_submit_request;
-
 	engine->emit_request = i9xx_emit_request;
-	if (INTEL_GEN(dev_priv) >= 6)
-		engine->emit_request = gen6_emit_request;
+	engine->submit_request = i9xx_submit_request;
 
 	if (INTEL_GEN(dev_priv) >= 8)
 		engine->emit_bb_start = gen8_emit_bb_start;
-- 
2.8.1