drm/i915: Pull i915_gem_active into the i915_active family

Looking forward, we need to break the struct_mutex dependency on
i915_gem_active. In the meantime, external use of i915_gem_active is
quite beguiling, little do new users suspect that it implies a barrier
as each request it tracks must be ordered wrt the previous one. As one
of many, it can be used to track activity across multiple timelines, a
shared fence, which fits our unordered request submission much better. We
need to steer external users away from the singular, exclusive fence
imposed by i915_gem_active to i915_active instead. As part of that
process, we move i915_gem_active out of i915_request.c into
i915_active.c to start separating the two concepts, and rename it to
i915_active_request (both to tie it to the concept of tracking just one
request, and to give it a longer, less appealing name).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190205130005.2807-5-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_vma.c

@@ -120,7 +120,7 @@ vma_create(struct drm_i915_gem_object *obj,
 		return ERR_PTR(-ENOMEM);
 
 	i915_active_init(vm->i915, &vma->active, __i915_vma_retire);
-	init_request_active(&vma->last_fence, NULL);
+	INIT_ACTIVE_REQUEST(&vma->last_fence);
 
 	vma->vm = vm;
 	vma->ops = &vm->vma_ops;
@@ -808,7 +808,7 @@ static void __i915_vma_destroy(struct i915_vma *vma)
 	GEM_BUG_ON(vma->node.allocated);
 	GEM_BUG_ON(vma->fence);
 
-	GEM_BUG_ON(i915_gem_active_isset(&vma->last_fence));
+	GEM_BUG_ON(i915_active_request_isset(&vma->last_fence));
 
 	mutex_lock(&vma->vm->mutex);
 	list_del(&vma->vm_link);
@@ -942,14 +942,14 @@ int i915_vma_move_to_active(struct i915_vma *vma,
 		obj->write_domain = I915_GEM_DOMAIN_RENDER;
 
 		if (intel_fb_obj_invalidate(obj, ORIGIN_CS))
-			i915_gem_active_set(&obj->frontbuffer_write, rq);
+			__i915_active_request_set(&obj->frontbuffer_write, rq);
 
 		obj->read_domains = 0;
 	}
 	obj->read_domains |= I915_GEM_GPU_DOMAINS;
 
 	if (flags & EXEC_OBJECT_NEEDS_FENCE)
-		i915_gem_active_set(&vma->last_fence, rq);
+		__i915_active_request_set(&vma->last_fence, rq);
 
 	export_fence(vma, rq, flags);
 	return 0;
@@ -986,8 +986,8 @@ int i915_vma_unbind(struct i915_vma *vma)
 		if (ret)
 			goto unpin;
 
-		ret = i915_gem_active_retire(&vma->last_fence,
-					     &vma->vm->i915->drm.struct_mutex);
+		ret = i915_active_request_retire(&vma->last_fence,
+					      &vma->vm->i915->drm.struct_mutex);
 unpin:
 		__i915_vma_unpin(vma);
 		if (ret)