drm/i915: Remove the now obsolete 'outstanding_lazy_request'

The outstanding_lazy_request is no longer used anywhere in the driver.
Everything that was looking at it now has a request explicitly passed in from on
high. Everything that was relying upon it behind the scenes is now explicitly
creating/passing/submitting its own private request. Thus the OLR can be
removed.

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Tomas Elf <tomas.elf@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem.c

@@ -1157,9 +1157,6 @@ i915_gem_check_olr(struct drm_i915_gem_request *req)
 {
 	WARN_ON(!mutex_is_locked(&req->ring->dev->struct_mutex));
 
-	if (req == req->ring->outstanding_lazy_request)
-		i915_add_request(req);
-
 	return 0;
 }
 
@@ -2488,8 +2485,6 @@ void __i915_add_request(struct drm_i915_gem_request *request,
 	dev_priv = ring->dev->dev_private;
 	ringbuf = request->ringbuf;
 
-	WARN_ON(request != ring->outstanding_lazy_request);
-
 	/*
 	 * To ensure that this call will not fail, space for its emissions
 	 * should already have been reserved in the ring buffer. Let the ring
@@ -2558,7 +2553,6 @@ void __i915_add_request(struct drm_i915_gem_request *request,
 	}
 
 	trace_i915_gem_request_add(request);
-	ring->outstanding_lazy_request = NULL;
 
 	i915_queue_hangcheck(ring->dev);
 
@@ -2647,8 +2641,7 @@ int i915_gem_request_alloc(struct intel_engine_cs *ring,
 	if (!req_out)
 		return -EINVAL;
 
-	if ((*req_out = ring->outstanding_lazy_request) != NULL)
-		return 0;
+	*req_out = NULL;
 
 	req = kmem_cache_zalloc(dev_priv->requests, GFP_KERNEL);
 	if (req == NULL)
@@ -2694,7 +2687,7 @@ int i915_gem_request_alloc(struct intel_engine_cs *ring,
 		return ret;
 	}
 
-	*req_out = ring->outstanding_lazy_request = req;
+	*req_out = req;
 	return 0;
 
 err:
@@ -2791,9 +2784,6 @@ static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
 
 		i915_gem_request_retire(request);
 	}
-
-	/* This may not have been flushed before the reset, so clean it now */
-	i915_gem_request_assign(&ring->outstanding_lazy_request, NULL);
 }
 
 void i915_gem_restore_fences(struct drm_device *dev)
@@ -3344,8 +3334,6 @@ int i915_gpu_idle(struct drm_device *dev)
 			i915_add_request_no_flush(req);
 		}
 
-		WARN_ON(ring->outstanding_lazy_request);
-
 		ret = intel_ring_idle(ring);
 		if (ret)
 			return ret;

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -1655,10 +1655,8 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	 * must be freed again. If it was submitted then it is being tracked
 	 * on the active request list and no clean up is required here.
 	 */
-	if (ret && params->request) {
+	if (ret && params->request)
 		i915_gem_request_cancel(params->request);
-		ring->outstanding_lazy_request = NULL;
-	}
 
 	mutex_unlock(&dev->struct_mutex);
 

drivers/gpu/drm/i915/intel_lrc.c

@@ -1633,7 +1633,6 @@ void intel_logical_ring_cleanup(struct intel_engine_cs *ring)
 
 	intel_logical_ring_stop(ring);
 	WARN_ON((I915_READ_MODE(ring) & MODE_IDLE) == 0);
-	i915_gem_request_assign(&ring->outstanding_lazy_request, NULL);
 
 	if (ring->cleanup)
 		ring->cleanup(ring);

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -2101,7 +2101,6 @@ void intel_cleanup_ring_buffer(struct intel_engine_cs *ring)
 
 	intel_unpin_ringbuffer_obj(ringbuf);
 	intel_destroy_ringbuffer_obj(ringbuf);
-	i915_gem_request_assign(&ring->outstanding_lazy_request, NULL);
 
 	if (ring->cleanup)
 		ring->cleanup(ring);
@@ -2176,11 +2175,6 @@ int intel_ring_idle(struct intel_engine_cs *ring)
 {
 	struct drm_i915_gem_request *req;
 
-	/* We need to add any requests required to flush the objects and ring */
-	WARN_ON(ring->outstanding_lazy_request);
-	if (ring->outstanding_lazy_request)
-		i915_add_request(ring->outstanding_lazy_request);
-
 	/* Wait upon the last request to be completed */
 	if (list_empty(&ring->request_list))
 		return 0;
@@ -2339,8 +2333,6 @@ void intel_ring_init_seqno(struct intel_engine_cs *ring, u32 seqno)
 	struct drm_device *dev = ring->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	BUG_ON(ring->outstanding_lazy_request);
-
 	if (INTEL_INFO(dev)->gen == 6 || INTEL_INFO(dev)->gen == 7) {
 		I915_WRITE(RING_SYNC_0(ring->mmio_base), 0);
 		I915_WRITE(RING_SYNC_1(ring->mmio_base), 0);

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -291,10 +291,6 @@ struct  intel_engine_cs {
 	 */
 	struct list_head request_list;
 
-	/**
-	 * Do we have some not yet emitted requests outstanding?
-	 */
-	struct drm_i915_gem_request *outstanding_lazy_request;
 	bool gpu_caches_dirty;
 
 	wait_queue_head_t irq_queue;