drm/i915: Move golden context init into ->init_context

Similar to a patch from Thomas Daniel for lrc contexts. This keeps
both sides somewhat in sync and should make Dave Gordon happy.

Note that both the wa and the golden context init code suffer a bit
from an inssuficient split into driver load and hw init code. Which
means we have a bunch of tests all over the place to check whether the
one-time initialization has been done already or not.

All that one-tim code should be moved into the one-time ring setup
code, but that's work for later.

Cc: Dave Gordon <david.s.gordon@intel.com>
Cc: Thomas Daniel <thomas.daniel@intel.com>
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_context.c

@@ -651,10 +651,6 @@ static int do_switch(struct intel_engine_cs *ring,
 			if (ret)
 				DRM_ERROR("ring init context: %d\n", ret);
 		}
-
-		ret = i915_gem_render_state_init(ring);
-		if (ret)
-			DRM_ERROR("init render state: %d\n", ret);
 	}
 
 	return 0;

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -710,6 +710,22 @@ static int intel_ring_workarounds_emit(struct intel_engine_cs *ring,
 	return 0;
 }
 
+static int intel_rcs_ctx_init(struct intel_engine_cs *ring,
+			      struct intel_context *ctx)
+{
+	int ret;
+
+	ret = intel_ring_workarounds_emit(ring, ctx);
+	if (ret != 0)
+		return ret;
+
+	ret = i915_gem_render_state_init(ring);
+	if (ret)
+		DRM_ERROR("init render state: %d\n", ret);
+
+	return ret;
+}
+
 static int wa_add(struct drm_i915_private *dev_priv,
 		  const u32 addr, const u32 val, const u32 mask)
 {
@@ -2345,7 +2361,7 @@ int intel_init_render_ring_buffer(struct drm_device *dev)
 			}
 		}
 
-		ring->init_context = intel_ring_workarounds_emit;
+		ring->init_context = intel_rcs_ctx_init;
 		ring->add_request = gen6_add_request;
 		ring->flush = gen8_render_ring_flush;
 		ring->irq_get = gen8_ring_get_irq;