drm/i915: Only init engines once

We can do this.

And now there's finally the clean split between software setup and
hardware setup I kinda wanted since multi-ring support was merged
aeons ago. It only took almost 5 years.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem.c

@@ -4769,6 +4769,7 @@ int
 i915_gem_init_hw(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_engine_cs *ring;
 	int ret, i;
 
 	if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt())
@@ -4795,9 +4796,11 @@ i915_gem_init_hw(struct drm_device *dev)
 
 	i915_gem_init_swizzling(dev);
 
-	ret = dev_priv->gt.init_rings(dev);
-	if (ret)
-		return ret;
+	for_each_ring(ring, dev_priv, i) {
+		ret = ring->init_hw(ring);
+		if (ret)
+			return ret;
+	}
 
 	for (i = 0; i < NUM_L3_SLICES(dev); i++)
 		i915_gem_l3_remap(&dev_priv->ring[RCS], i);
@@ -4870,6 +4873,10 @@ int i915_gem_init(struct drm_device *dev)
 		return ret;
 	}
 
+	ret = dev_priv->gt.init_rings(dev);
+	if (ret)
+		return ret;
+
 	ret = i915_gem_init_hw(dev);
 	if (ret == -EIO) {
 		/* Allow ring initialisation to fail by marking the GPU as

drivers/gpu/drm/i915/intel_lrc.c

@@ -1387,12 +1387,6 @@ static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *rin
 	if (ret)
 		return ret;
 
-	if (ring->init_hw) {
-		ret = ring->init_hw(ring);
-		if (ret)
-			return ret;
-	}
-
 	ret = intel_lr_context_deferred_create(ring->default_context, ring);
 
 	return ret;

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -1859,10 +1859,6 @@ static int intel_init_ring_buffer(struct drm_device *dev,
 	if (ret)
 		goto error;
 
-	ret = ring->init_hw(ring);
-	if (ret)
-		goto error;
-
 	return 0;
 
 error: