drm/i915: Store some backpointers in struct intel_gt

We need an easy way to get back to i915 and uncore.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190621070811.7006-4-tvrtko.ursulin@linux.intel.com

drivers/gpu/drm/i915/gt/intel_gt.c

@@ -3,10 +3,15 @@
  * Copyright © 2019 Intel Corporation
  */
 
+#include "i915_drv.h"
+
 #include "intel_gt.h"
 
-void intel_gt_init_early(struct intel_gt *gt)
+void intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915)
 {
+	gt->i915 = i915;
+	gt->uncore = &i915->uncore;
+
 	INIT_LIST_HEAD(&gt->active_rings);
 	INIT_LIST_HEAD(&gt->closed_vma);
 

drivers/gpu/drm/i915/gt/intel_gt.h

@@ -8,6 +8,8 @@
 
 #include "intel_gt_types.h"
 
-void intel_gt_init_early(struct intel_gt *gt);
+struct drm_i915_private;
+
+void intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915);
 
 #endif /* __INTEL_GT_H__ */

drivers/gpu/drm/i915/gt/intel_gt_types.h

@@ -16,7 +16,13 @@
 #include "i915_vma.h"
 #include "intel_wakeref.h"
 
+struct drm_i915_private;
+struct intel_uncore;
+
 struct intel_gt {
+	struct drm_i915_private *i915;
+	struct intel_uncore *uncore;
+
 	struct i915_gt_timelines {
 		struct mutex mutex; /* protects list, tainted by GPU */
 		struct list_head active_list;

drivers/gpu/drm/i915/i915_drv.c

@@ -923,7 +923,7 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv)
 	if (ret < 0)
 		goto err_engines;
 
-	intel_gt_init_early(&dev_priv->gt);
+	intel_gt_init_early(&dev_priv->gt, dev_priv);
 
 	ret = i915_gem_init_early(dev_priv);
 	if (ret < 0)

drivers/gpu/drm/i915/selftests/mock_gem_device.c

@@ -180,7 +180,7 @@ struct drm_i915_private *mock_gem_device(void)
 
 	mock_uncore_init(&i915->uncore);
 	i915_gem_init__mm(i915);
-	intel_gt_init_early(&i915->gt);
+	intel_gt_init_early(&i915->gt, i915);
 	intel_gt_pm_init(i915);
 	atomic_inc(&i915->gt.wakeref.count); /* disable; no hw support */