drm/i915: Store backpointer to intel_gt in the engine

It will come useful in the next patch.

v2:
 * Do mock_engine as well.

v3:
 * And the virtual engine...
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/20190621070811.7006-11-tvrtko.ursulin@linux.intel.com

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

@@ -316,6 +316,7 @@ intel_engine_setup(struct drm_i915_private *dev_priv,
 	engine->id = id;
 	engine->mask = BIT(id);
 	engine->i915 = dev_priv;
+	engine->gt = &dev_priv->gt;
 	engine->uncore = &dev_priv->uncore;
 	__sprint_engine_name(engine->name, info);
 	engine->hw_id = engine->guc_id = info->hw_id;

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

@@ -36,6 +36,7 @@ struct drm_i915_reg_table;
 struct i915_gem_context;
 struct i915_request;
 struct i915_sched_attr;
+struct intel_gt;
 struct intel_uncore;
 
 typedef u8 intel_engine_mask_t;
@@ -257,6 +258,7 @@ struct intel_engine_execlists {
 
 struct intel_engine_cs {
 	struct drm_i915_private *i915;
+	struct intel_gt *gt;
 	struct intel_uncore *uncore;
 	char name[INTEL_ENGINE_CS_MAX_NAME];
 

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

@@ -3363,6 +3363,7 @@ intel_execlists_create_virtual(struct i915_gem_context *ctx,
 		return ERR_PTR(-ENOMEM);
 
 	ve->base.i915 = ctx->i915;
+	ve->base.gt = siblings[0]->gt;
 	ve->base.id = -1;
 	ve->base.class = OTHER_CLASS;
 	ve->base.uabi_class = I915_ENGINE_CLASS_INVALID;

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

@@ -257,6 +257,7 @@ struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
 
 	/* minimal engine setup for requests */
 	engine->base.i915 = i915;
+	engine->base.gt = &i915->gt;
 	snprintf(engine->base.name, sizeof(engine->base.name), "%s", name);
 	engine->base.id = id;
 	engine->base.mask = BIT(id);