drm/i915: Don't look at pg_dirty_rings for aliasing ppgtt

We load the ppgtt ptes once per gpu reset/driver load/resume and
that's all that's needed. Note that this only blows up when we're
using the allocate_va_range funcs and not the special-purpose ones
used. With this change we can get rid of that duplication.
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

drivers/gpu/drm/i915/i915_gem_context.c

@@ -575,8 +575,6 @@ static inline bool should_skip_switch(struct intel_engine_cs *ring,
 				      struct intel_context *from,
 				      struct intel_context *to)
 {
-	struct drm_i915_private *dev_priv = ring->dev->dev_private;
-
 	if (to->remap_slice)
 		return false;
 
@@ -584,10 +582,6 @@ static inline bool should_skip_switch(struct intel_engine_cs *ring,
 		if (from == to && !test_bit(ring->id,
 				&to->ppgtt->pd_dirty_rings))
 			return true;
-	} else if (dev_priv->mm.aliasing_ppgtt) {
-		if (from == to && !test_bit(ring->id,
-				&dev_priv->mm.aliasing_ppgtt->pd_dirty_rings))
-			return true;
 	}
 
 	return false;

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -1251,9 +1251,6 @@ i915_gem_ringbuffer_submission(struct drm_device *dev, struct drm_file *file,
 	if (ctx->ppgtt)
 		WARN(ctx->ppgtt->pd_dirty_rings & (1<<ring->id),
 			"%s didn't clear reload\n", ring->name);
-	else if (dev_priv->mm.aliasing_ppgtt)
-		WARN(dev_priv->mm.aliasing_ppgtt->pd_dirty_rings &
-			(1<<ring->id), "%s didn't clear reload\n", ring->name);
 
 	instp_mode = args->flags & I915_EXEC_CONSTANTS_MASK;
 	instp_mask = I915_EXEC_CONSTANTS_MASK;