drm/i915: Use a separate slab for vmas

vma are more frequently allocated than objects and so should equally
benefit from having a dedicated slab.
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_dma.c

@@ -1008,6 +1008,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 free_priv:
 	if (dev_priv->requests)
 		kmem_cache_destroy(dev_priv->requests);
+	if (dev_priv->vmas)
+		kmem_cache_destroy(dev_priv->vmas);
 	if (dev_priv->objects)
 		kmem_cache_destroy(dev_priv->objects);
 	kfree(dev_priv);
@@ -1094,6 +1096,8 @@ int i915_driver_unload(struct drm_device *dev)
 
 	if (dev_priv->requests)
 		kmem_cache_destroy(dev_priv->requests);
+	if (dev_priv->vmas)
+		kmem_cache_destroy(dev_priv->vmas);
 	if (dev_priv->objects)
 		kmem_cache_destroy(dev_priv->objects);
 

drivers/gpu/drm/i915/i915_drv.h

@@ -1559,6 +1559,7 @@ struct i915_virtual_gpu {
 struct drm_i915_private {
 	struct drm_device *dev;
 	struct kmem_cache *objects;
+	struct kmem_cache *vmas;
 	struct kmem_cache *requests;
 
 	const struct intel_device_info info;

drivers/gpu/drm/i915/i915_gem.c

@@ -4612,7 +4612,7 @@ void i915_gem_vma_destroy(struct i915_vma *vma)
 
 	list_del(&vma->vma_link);
 
-	kfree(vma);
+	kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma);
 }
 
 static void
@@ -4991,6 +4991,11 @@ i915_gem_load(struct drm_device *dev)
 				  sizeof(struct drm_i915_gem_object), 0,
 				  SLAB_HWCACHE_ALIGN,
 				  NULL);
+	dev_priv->vmas =
+		kmem_cache_create("i915_gem_vma",
+				  sizeof(struct i915_vma), 0,
+				  SLAB_HWCACHE_ALIGN,
+				  NULL);
 	dev_priv->requests =
 		kmem_cache_create("i915_gem_request",
 				  sizeof(struct drm_i915_gem_request), 0,

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -2712,7 +2712,8 @@ __i915_gem_vma_create(struct drm_i915_gem_object *obj,
 
 	if (WARN_ON(i915_is_ggtt(vm) != !!ggtt_view))
 		return ERR_PTR(-EINVAL);
-	vma = kzalloc(sizeof(*vma), GFP_KERNEL);
+
+	vma = kmem_cache_zalloc(to_i915(obj->base.dev)->vmas, GFP_KERNEL);
 	if (vma == NULL)
 		return ERR_PTR(-ENOMEM);