drm: Extract drm_mode_object.[hc]

Just for the struct drm_mode_object base class. The header file was
already partially extracted to help untangle the include loops.

v2:
- Also move the generic get/set property ioctls. At first this seemed
  like a bad idea since it requires making drm_mode_crtc_set_obj_prop
  non-static. But eventually that will get split away too (like
  the connector version already is) for both crtc and planes. Hence I
  reconsidered.

- drm_mode_object.[hc] instead of drm_modeset.[hc], which requires
  renaming the drm_modeset.h header I already started building up.
  This is more consistent (matches the name of the main structure),
  and I want to be able to use drm_modeset.[hc] for the basic modeset
  init/cleanup functionality like drm_mode_config_init.

Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160829082757.17913-3-daniel.vetter@ffwll.ch

4 files changed, 468 insertions, 434 deletions

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index efdb4176230f..59979f3f3648 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -14,7 +14,7 @@ drm-y       :=	drm_auth.o drm_bufs.o drm_cache.o \
 		drm_rect.o drm_vma_manager.o drm_flip_work.o \
 		drm_modeset_lock.o drm_atomic.o drm_bridge.o \
 		drm_framebuffer.o drm_connector.o drm_blend.o \
-		drm_encoder.o
+		drm_encoder.o drm_mode_object.o
 
 drm-$(CONFIG_COMPAT) += drm_ioc32.o
 drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 219cd4ee23b7..c9dc031d9b36 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -57,162 +57,6 @@ static const struct drm_prop_enum_list drm_plane_type_enum_list[] = {
 /*
  * Optional properties
  */
-/*
- * Internal function to assign a slot in the object idr and optionally
- * register the object into the idr.
- */
-int drm_mode_object_get_reg(struct drm_device *dev,
-			    struct drm_mode_object *obj,
-			    uint32_t obj_type,
-			    bool register_obj,
-			    void (*obj_free_cb)(struct kref *kref))
-{
-	int ret;
-
-	mutex_lock(&dev->mode_config.idr_mutex);
-	ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL);
-	if (ret >= 0) {
-		/*
-		 * Set up the object linking under the protection of the idr
-		 * lock so that other users can't see inconsistent state.
-		 */
-		obj->id = ret;
-		obj->type = obj_type;
-		if (obj_free_cb) {
-			obj->free_cb = obj_free_cb;
-			kref_init(&obj->refcount);
-		}
-	}
-	mutex_unlock(&dev->mode_config.idr_mutex);
-
-	return ret < 0 ? ret : 0;
-}
-
-/**
- * drm_mode_object_get - allocate a new modeset identifier
- * @dev: DRM device
- * @obj: object pointer, used to generate unique ID
- * @obj_type: object type
- *
- * Create a unique identifier based on @ptr in @dev's identifier space.  Used
- * for tracking modes, CRTCs and connectors. Note that despite the _get postfix
- * modeset identifiers are _not_ reference counted. Hence don't use this for
- * reference counted modeset objects like framebuffers.
- *
- * Returns:
- * Zero on success, error code on failure.
- */
-int drm_mode_object_get(struct drm_device *dev,
-			struct drm_mode_object *obj, uint32_t obj_type)
-{
-	return drm_mode_object_get_reg(dev, obj, obj_type, true, NULL);
-}
-
-void drm_mode_object_register(struct drm_device *dev,
-			      struct drm_mode_object *obj)
-{
-	mutex_lock(&dev->mode_config.idr_mutex);
-	idr_replace(&dev->mode_config.crtc_idr, obj, obj->id);
-	mutex_unlock(&dev->mode_config.idr_mutex);
-}
-
-/**
- * drm_mode_object_unregister - free a modeset identifer
- * @dev: DRM device
- * @object: object to free
- *
- * Free @id from @dev's unique identifier pool.
- * This function can be called multiple times, and guards against
- * multiple removals.
- * These modeset identifiers are _not_ reference counted. Hence don't use this
- * for reference counted modeset objects like framebuffers.
- */
-void drm_mode_object_unregister(struct drm_device *dev,
-			 struct drm_mode_object *object)
-{
-	mutex_lock(&dev->mode_config.idr_mutex);
-	if (object->id) {
-		idr_remove(&dev->mode_config.crtc_idr, object->id);
-		object->id = 0;
-	}
-	mutex_unlock(&dev->mode_config.idr_mutex);
-}
-
-struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
-					       uint32_t id, uint32_t type)
-{
-	struct drm_mode_object *obj = NULL;
-
-	mutex_lock(&dev->mode_config.idr_mutex);
-	obj = idr_find(&dev->mode_config.crtc_idr, id);
-	if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
-		obj = NULL;
-	if (obj && obj->id != id)
-		obj = NULL;
-
-	if (obj && obj->free_cb) {
-		if (!kref_get_unless_zero(&obj->refcount))
-			obj = NULL;
-	}
-	mutex_unlock(&dev->mode_config.idr_mutex);
-
-	return obj;
-}
-
-/**
- * drm_mode_object_find - look up a drm object with static lifetime
- * @dev: drm device
- * @id: id of the mode object
- * @type: type of the mode object
- *
- * This function is used to look up a modeset object. It will acquire a
- * reference for reference counted objects. This reference must be dropped again
- * by callind drm_mode_object_unreference().
- */
-struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
-		uint32_t id, uint32_t type)
-{
-	struct drm_mode_object *obj = NULL;
-
-	obj = __drm_mode_object_find(dev, id, type);
-	return obj;
-}
-EXPORT_SYMBOL(drm_mode_object_find);
-
-/**
- * drm_mode_object_unreference - decr the object refcnt
- * @obj: mode_object
- *
- * This functions decrements the object's refcount if it is a refcounted modeset
- * object. It is a no-op on any other object. This is used to drop references
- * acquired with drm_mode_object_reference().
- */
-void drm_mode_object_unreference(struct drm_mode_object *obj)
-{
-	if (obj->free_cb) {
-		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
-		kref_put(&obj->refcount, obj->free_cb);
-	}
-}
-EXPORT_SYMBOL(drm_mode_object_unreference);
-
-/**
- * drm_mode_object_reference - incr the object refcnt
- * @obj: mode_object
- *
- * This functions increments the object's refcount if it is a refcounted modeset
- * object. It is a no-op on any other object. References should be dropped again
- * by calling drm_mode_object_unreference().
- */
-void drm_mode_object_reference(struct drm_mode_object *obj)
-{
-	if (obj->free_cb) {
-		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
-		kref_get(&obj->refcount);
-	}
-}
-EXPORT_SYMBOL(drm_mode_object_reference);
-
 /**
  * drm_crtc_force_disable - Forcibly turn off a CRTC
  * @crtc: CRTC to turn off
@@ -1010,45 +854,6 @@ int drm_mode_getcrtc(struct drm_device *dev,
 	return 0;
 }
 
-/* helper for getconnector and getproperties ioctls */
-int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
-				   uint32_t __user *prop_ptr,
-				   uint64_t __user *prop_values,
-				   uint32_t *arg_count_props)
-{
-	int props_count;
-	int i, ret, copied;
-
-	props_count = obj->properties->count;
-	if (!atomic)
-		props_count -= obj->properties->atomic_count;
-
-	if ((*arg_count_props >= props_count) && props_count) {
-		for (i = 0, copied = 0; copied < props_count; i++) {
-			struct drm_property *prop = obj->properties->properties[i];
-			uint64_t val;
-
-			if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
-				continue;
-
-			ret = drm_object_property_get_value(obj, prop, &val);
-			if (ret)
-				return ret;
-
-			if (put_user(prop->base.id, prop_ptr + copied))
-				return -EFAULT;
-
-			if (put_user(val, prop_values + copied))
-				return -EFAULT;
-
-			copied++;
-		}
-	}
-	*arg_count_props = props_count;
-
-	return 0;
-}
-
 /**
  * drm_mode_getplane_res - enumerate all plane resources
  * @dev: DRM device
@@ -2291,105 +2096,6 @@ void drm_property_destroy(struct drm_device *dev, struct drm_property *property)
 EXPORT_SYMBOL(drm_property_destroy);
 
 /**
- * drm_object_attach_property - attach a property to a modeset object
- * @obj: drm modeset object
- * @property: property to attach
- * @init_val: initial value of the property
- *
- * This attaches the given property to the modeset object with the given initial
- * value. Currently this function cannot fail since the properties are stored in
- * a statically sized array.
- */
-void drm_object_attach_property(struct drm_mode_object *obj,
-				struct drm_property *property,
-				uint64_t init_val)
-{
-	int count = obj->properties->count;
-
-	if (count == DRM_OBJECT_MAX_PROPERTY) {
-		WARN(1, "Failed to attach object property (type: 0x%x). Please "
-			"increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
-			"you see this message on the same object type.\n",
-			obj->type);
-		return;
-	}
-
-	obj->properties->properties[count] = property;
-	obj->properties->values[count] = init_val;
-	obj->properties->count++;
-	if (property->flags & DRM_MODE_PROP_ATOMIC)
-		obj->properties->atomic_count++;
-}
-EXPORT_SYMBOL(drm_object_attach_property);
-
-/**
- * drm_object_property_set_value - set the value of a property
- * @obj: drm mode object to set property value for
- * @property: property to set
- * @val: value the property should be set to
- *
- * This functions sets a given property on a given object. This function only
- * changes the software state of the property, it does not call into the
- * driver's ->set_property callback.
- *
- * Returns:
- * Zero on success, error code on failure.
- */
-int drm_object_property_set_value(struct drm_mode_object *obj,
-				  struct drm_property *property, uint64_t val)
-{
-	int i;
-
-	for (i = 0; i < obj->properties->count; i++) {
-		if (obj->properties->properties[i] == property) {
-			obj->properties->values[i] = val;
-			return 0;
-		}
-	}
-
-	return -EINVAL;
-}
-EXPORT_SYMBOL(drm_object_property_set_value);
-
-/**
- * drm_object_property_get_value - retrieve the value of a property
- * @obj: drm mode object to get property value from
- * @property: property to retrieve
- * @val: storage for the property value
- *
- * This function retrieves the softare state of the given property for the given
- * property. Since there is no driver callback to retrieve the current property
- * value this might be out of sync with the hardware, depending upon the driver
- * and property.
- *
- * Returns:
- * Zero on success, error code on failure.
- */
-int drm_object_property_get_value(struct drm_mode_object *obj,
-				  struct drm_property *property, uint64_t *val)
-{
-	int i;
-
-	/* read-only properties bypass atomic mechanism and still store
-	 * their value in obj->properties->values[].. mostly to avoid
-	 * having to deal w/ EDID and similar props in atomic paths:
-	 */
-	if (drm_core_check_feature(property->dev, DRIVER_ATOMIC) &&
-			!(property->flags & DRM_MODE_PROP_IMMUTABLE))
-		return drm_atomic_get_property(obj, property, val);
-
-	for (i = 0; i < obj->properties->count; i++) {
-		if (obj->properties->properties[i] == property) {
-			*val = obj->properties->values[i];
-			return 0;
-		}
-	}
-
-	return -EINVAL;
-}
-EXPORT_SYMBOL(drm_object_property_get_value);
-
-/**
  * drm_mode_getproperty_ioctl - get the property metadata
  * @dev: DRM device
  * @data: ioctl data
@@ -2934,9 +2640,9 @@ void drm_property_change_valid_put(struct drm_property *property,
 		drm_property_unreference_blob(obj_to_blob(ref));
 }
 
-static int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
-				      struct drm_property *property,
-				      uint64_t value)
+int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
+			       struct drm_property *property,
+			       uint64_t value)
 {
 	int ret = -EINVAL;
 	struct drm_crtc *crtc = obj_to_crtc(obj);
@@ -2979,119 +2685,6 @@ int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
 EXPORT_SYMBOL(drm_mode_plane_set_obj_prop);
 
 /**
- * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
- * @dev: DRM device
- * @data: ioctl data
- * @file_priv: DRM file info
- *
- * This function retrieves the current value for an object's property. Compared
- * to the connector specific ioctl this one is extended to also work on crtc and
- * plane objects.
- *
- * Called by the user via ioctl.
- *
- * Returns:
- * Zero on success, negative errno on failure.
- */
-int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
-				      struct drm_file *file_priv)
-{
-	struct drm_mode_obj_get_properties *arg = data;
-	struct drm_mode_object *obj;
-	int ret = 0;
-
-	if (!drm_core_check_feature(dev, DRIVER_MODESET))
-		return -EINVAL;
-
-	drm_modeset_lock_all(dev);
-
-	obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
-	if (!obj) {
-		ret = -ENOENT;
-		goto out;
-	}
-	if (!obj->properties) {
-		ret = -EINVAL;
-		goto out_unref;
-	}
-
-	ret = drm_mode_object_get_properties(obj, file_priv->atomic,
-			(uint32_t __user *)(unsigned long)(arg->props_ptr),
-			(uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
-			&arg->count_props);
-
-out_unref:
-	drm_mode_object_unreference(obj);
-out:
-	drm_modeset_unlock_all(dev);
-	return ret;
-}
-
-int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
-				    struct drm_file *file_priv)
-{
-	struct drm_mode_obj_set_property *arg = data;
-	struct drm_mode_object *arg_obj;
-	struct drm_mode_object *prop_obj;
-	struct drm_property *property;
-	int i, ret = -EINVAL;
-	struct drm_mode_object *ref;
-
-	if (!drm_core_check_feature(dev, DRIVER_MODESET))
-		return -EINVAL;
-
-	drm_modeset_lock_all(dev);
-
-	arg_obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
-	if (!arg_obj) {
-		ret = -ENOENT;
-		goto out;
-	}
-	if (!arg_obj->properties)
-		goto out_unref;
-
-	for (i = 0; i < arg_obj->properties->count; i++)
-		if (arg_obj->properties->properties[i]->base.id == arg->prop_id)
-			break;
-
-	if (i == arg_obj->properties->count)
-		goto out_unref;
-
-	prop_obj = drm_mode_object_find(dev, arg->prop_id,
-					DRM_MODE_OBJECT_PROPERTY);
-	if (!prop_obj) {
-		ret = -ENOENT;
-		goto out_unref;
-	}
-	property = obj_to_property(prop_obj);
-
-	if (!drm_property_change_valid_get(property, arg->value, &ref))
-		goto out_unref;
-
-	switch (arg_obj->type) {
-	case DRM_MODE_OBJECT_CONNECTOR:
-		ret = drm_mode_connector_set_obj_prop(arg_obj, property,
-						      arg->value);
-		break;
-	case DRM_MODE_OBJECT_CRTC:
-		ret = drm_mode_crtc_set_obj_prop(arg_obj, property, arg->value);
-		break;
-	case DRM_MODE_OBJECT_PLANE:
-		ret = drm_mode_plane_set_obj_prop(obj_to_plane(arg_obj),
-						  property, arg->value);
-		break;
-	}
-
-	drm_property_change_valid_put(property, ref);
-
-out_unref:
-	drm_mode_object_unreference(arg_obj);
-out:
-	drm_modeset_unlock_all(dev);
-	return ret;
-}
-
-/**
  * drm_mode_crtc_set_gamma_size - set the gamma table size
  * @crtc: CRTC to set the gamma table size for
  * @gamma_size: size of the gamma table
diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
index 54f9a2c85965..2eb1d941ea70 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -33,29 +33,14 @@
 
 
 /* drm_crtc.c */
-int drm_mode_object_get_reg(struct drm_device *dev,
-			    struct drm_mode_object *obj,
-			    uint32_t obj_type,
-			    bool register_obj,
-			    void (*obj_free_cb)(struct kref *kref));
-void drm_mode_object_register(struct drm_device *dev,
-			      struct drm_mode_object *obj);
-int drm_mode_object_get(struct drm_device *dev,
-			struct drm_mode_object *obj, uint32_t obj_type);
-struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
-					       uint32_t id, uint32_t type);
-void drm_mode_object_unregister(struct drm_device *dev,
-				struct drm_mode_object *object);
-int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
-				   uint32_t __user *prop_ptr,
-				   uint64_t __user *prop_values,
-				   uint32_t *arg_count_props);
+int drm_mode_crtc_set_obj_prop(struct drm_mode_object *obj,
+			       struct drm_property *property,
+			       uint64_t value);
 bool drm_property_change_valid_get(struct drm_property *property,
 				   uint64_t value,
 				   struct drm_mode_object **ref);
 void drm_property_change_valid_put(struct drm_property *property,
 				   struct drm_mode_object *ref);
-
 int drm_plane_check_pixel_format(const struct drm_plane *plane,
 				 u32 format);
 int drm_crtc_check_viewport(const struct drm_crtc *crtc,
@@ -76,11 +61,6 @@ int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
 				void *data, struct drm_file *file_priv);
 
 /* IOCTLs */
-int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
-				      struct drm_file *file_priv);
-int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
-				    struct drm_file *file_priv);
-
 int drm_mode_getresources(struct drm_device *dev,
 			  void *data, struct drm_file *file_priv);
 int drm_mode_getplane_res(struct drm_device *dev, void *data,
@@ -113,6 +93,32 @@ int drm_mode_gamma_set_ioctl(struct drm_device *dev,
 int drm_mode_page_flip_ioctl(struct drm_device *dev,
 			     void *data, struct drm_file *file_priv);
 
+/* drm_mode_object.c */
+int drm_mode_object_get_reg(struct drm_device *dev,
+			    struct drm_mode_object *obj,
+			    uint32_t obj_type,
+			    bool register_obj,
+			    void (*obj_free_cb)(struct kref *kref));
+void drm_mode_object_register(struct drm_device *dev,
+			      struct drm_mode_object *obj);
+int drm_mode_object_get(struct drm_device *dev,
+			struct drm_mode_object *obj, uint32_t obj_type);
+struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
+					       uint32_t id, uint32_t type);
+void drm_mode_object_unregister(struct drm_device *dev,
+				struct drm_mode_object *object);
+int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
+				   uint32_t __user *prop_ptr,
+				   uint64_t __user *prop_values,
+				   uint32_t *arg_count_props);
+
+/* IOCTL */
+
+int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
+				      struct drm_file *file_priv);
+int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
+				    struct drm_file *file_priv);
+
 /* drm_encoder.c */
 int drm_encoder_register_all(struct drm_device *dev);
 void drm_encoder_unregister_all(struct drm_device *dev);
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
new file mode 100644
index 000000000000..cef9104e8285
--- /dev/null
+++ b/drivers/gpu/drm/drm_mode_object.c
@@ -0,0 +1,435 @@
+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <linux/export.h>
+#include <drm/drmP.h>
+#include <drm/drm_mode_object.h>
+
+#include "drm_crtc_internal.h"
+
+/*
+ * Internal function to assign a slot in the object idr and optionally
+ * register the object into the idr.
+ */
+int drm_mode_object_get_reg(struct drm_device *dev,
+			    struct drm_mode_object *obj,
+			    uint32_t obj_type,
+			    bool register_obj,
+			    void (*obj_free_cb)(struct kref *kref))
+{
+	int ret;
+
+	mutex_lock(&dev->mode_config.idr_mutex);
+	ret = idr_alloc(&dev->mode_config.crtc_idr, register_obj ? obj : NULL, 1, 0, GFP_KERNEL);
+	if (ret >= 0) {
+		/*
+		 * Set up the object linking under the protection of the idr
+		 * lock so that other users can't see inconsistent state.
+		 */
+		obj->id = ret;
+		obj->type = obj_type;
+		if (obj_free_cb) {
+			obj->free_cb = obj_free_cb;
+			kref_init(&obj->refcount);
+		}
+	}
+	mutex_unlock(&dev->mode_config.idr_mutex);
+
+	return ret < 0 ? ret : 0;
+}
+
+/**
+ * drm_mode_object_get - allocate a new modeset identifier
+ * @dev: DRM device
+ * @obj: object pointer, used to generate unique ID
+ * @obj_type: object type
+ *
+ * Create a unique identifier based on @ptr in @dev's identifier space.  Used
+ * for tracking modes, CRTCs and connectors. Note that despite the _get postfix
+ * modeset identifiers are _not_ reference counted. Hence don't use this for
+ * reference counted modeset objects like framebuffers.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_mode_object_get(struct drm_device *dev,
+			struct drm_mode_object *obj, uint32_t obj_type)
+{
+	return drm_mode_object_get_reg(dev, obj, obj_type, true, NULL);
+}
+
+void drm_mode_object_register(struct drm_device *dev,
+			      struct drm_mode_object *obj)
+{
+	mutex_lock(&dev->mode_config.idr_mutex);
+	idr_replace(&dev->mode_config.crtc_idr, obj, obj->id);
+	mutex_unlock(&dev->mode_config.idr_mutex);
+}
+
+/**
+ * drm_mode_object_unregister - free a modeset identifer
+ * @dev: DRM device
+ * @object: object to free
+ *
+ * Free @id from @dev's unique identifier pool.
+ * This function can be called multiple times, and guards against
+ * multiple removals.
+ * These modeset identifiers are _not_ reference counted. Hence don't use this
+ * for reference counted modeset objects like framebuffers.
+ */
+void drm_mode_object_unregister(struct drm_device *dev,
+			 struct drm_mode_object *object)
+{
+	mutex_lock(&dev->mode_config.idr_mutex);
+	if (object->id) {
+		idr_remove(&dev->mode_config.crtc_idr, object->id);
+		object->id = 0;
+	}
+	mutex_unlock(&dev->mode_config.idr_mutex);
+}
+
+struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
+					       uint32_t id, uint32_t type)
+{
+	struct drm_mode_object *obj = NULL;
+
+	mutex_lock(&dev->mode_config.idr_mutex);
+	obj = idr_find(&dev->mode_config.crtc_idr, id);
+	if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
+		obj = NULL;
+	if (obj && obj->id != id)
+		obj = NULL;
+
+	if (obj && obj->free_cb) {
+		if (!kref_get_unless_zero(&obj->refcount))
+			obj = NULL;
+	}
+	mutex_unlock(&dev->mode_config.idr_mutex);
+
+	return obj;
+}
+
+/**
+ * drm_mode_object_find - look up a drm object with static lifetime
+ * @dev: drm device
+ * @id: id of the mode object
+ * @type: type of the mode object
+ *
+ * This function is used to look up a modeset object. It will acquire a
+ * reference for reference counted objects. This reference must be dropped again
+ * by callind drm_mode_object_unreference().
+ */
+struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
+		uint32_t id, uint32_t type)
+{
+	struct drm_mode_object *obj = NULL;
+
+	obj = __drm_mode_object_find(dev, id, type);
+	return obj;
+}
+EXPORT_SYMBOL(drm_mode_object_find);
+
+/**
+ * drm_mode_object_unreference - decr the object refcnt
+ * @obj: mode_object
+ *
+ * This functions decrements the object's refcount if it is a refcounted modeset
+ * object. It is a no-op on any other object. This is used to drop references
+ * acquired with drm_mode_object_reference().
+ */
+void drm_mode_object_unreference(struct drm_mode_object *obj)
+{
+	if (obj->free_cb) {
+		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
+		kref_put(&obj->refcount, obj->free_cb);
+	}
+}
+EXPORT_SYMBOL(drm_mode_object_unreference);
+
+/**
+ * drm_mode_object_reference - incr the object refcnt
+ * @obj: mode_object
+ *
+ * This functions increments the object's refcount if it is a refcounted modeset
+ * object. It is a no-op on any other object. References should be dropped again
+ * by calling drm_mode_object_unreference().
+ */
+void drm_mode_object_reference(struct drm_mode_object *obj)
+{
+	if (obj->free_cb) {
+		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, atomic_read(&obj->refcount.refcount));
+		kref_get(&obj->refcount);
+	}
+}
+EXPORT_SYMBOL(drm_mode_object_reference);
+
+/**
+ * drm_object_attach_property - attach a property to a modeset object
+ * @obj: drm modeset object
+ * @property: property to attach
+ * @init_val: initial value of the property
+ *
+ * This attaches the given property to the modeset object with the given initial
+ * value. Currently this function cannot fail since the properties are stored in
+ * a statically sized array.
+ */
+void drm_object_attach_property(struct drm_mode_object *obj,
+				struct drm_property *property,
+				uint64_t init_val)
+{
+	int count = obj->properties->count;
+
+	if (count == DRM_OBJECT_MAX_PROPERTY) {
+		WARN(1, "Failed to attach object property (type: 0x%x). Please "
+			"increase DRM_OBJECT_MAX_PROPERTY by 1 for each time "
+			"you see this message on the same object type.\n",
+			obj->type);
+		return;
+	}
+
+	obj->properties->properties[count] = property;
+	obj->properties->values[count] = init_val;
+	obj->properties->count++;
+	if (property->flags & DRM_MODE_PROP_ATOMIC)
+		obj->properties->atomic_count++;
+}
+EXPORT_SYMBOL(drm_object_attach_property);
+
+/**
+ * drm_object_property_set_value - set the value of a property
+ * @obj: drm mode object to set property value for
+ * @property: property to set
+ * @val: value the property should be set to
+ *
+ * This functions sets a given property on a given object. This function only
+ * changes the software state of the property, it does not call into the
+ * driver's ->set_property callback.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_object_property_set_value(struct drm_mode_object *obj,
+				  struct drm_property *property, uint64_t val)
+{
+	int i;
+
+	for (i = 0; i < obj->properties->count; i++) {
+		if (obj->properties->properties[i] == property) {
+			obj->properties->values[i] = val;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(drm_object_property_set_value);
+
+/**
+ * drm_object_property_get_value - retrieve the value of a property
+ * @obj: drm mode object to get property value from
+ * @property: property to retrieve
+ * @val: storage for the property value
+ *
+ * This function retrieves the softare state of the given property for the given
+ * property. Since there is no driver callback to retrieve the current property
+ * value this might be out of sync with the hardware, depending upon the driver
+ * and property.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_object_property_get_value(struct drm_mode_object *obj,
+				  struct drm_property *property, uint64_t *val)
+{
+	int i;
+
+	/* read-only properties bypass atomic mechanism and still store
+	 * their value in obj->properties->values[].. mostly to avoid
+	 * having to deal w/ EDID and similar props in atomic paths:
+	 */
+	if (drm_core_check_feature(property->dev, DRIVER_ATOMIC) &&
+			!(property->flags & DRM_MODE_PROP_IMMUTABLE))
+		return drm_atomic_get_property(obj, property, val);
+
+	for (i = 0; i < obj->properties->count; i++) {
+		if (obj->properties->properties[i] == property) {
+			*val = obj->properties->values[i];
+			return 0;
+		}
+
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(drm_object_property_get_value);
+
+/* helper for getconnector and getproperties ioctls */
+int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
+				   uint32_t __user *prop_ptr,
+				   uint64_t __user *prop_values,
+				   uint32_t *arg_count_props)
+{
+	int props_count;
+	int i, ret, copied;
+
+	props_count = obj->properties->count;
+	if (!atomic)
+		props_count -= obj->properties->atomic_count;
+
+	if ((*arg_count_props >= props_count) && props_count) {
+		for (i = 0, copied = 0; copied < props_count; i++) {
+			struct drm_property *prop = obj->properties->properties[i];
+			uint64_t val;
+
+			if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)
+				continue;
+
+			ret = drm_object_property_get_value(obj, prop, &val);
+			if (ret)
+				return ret;
+
+			if (put_user(prop->base.id, prop_ptr + copied))
+				return -EFAULT;
+
+			if (put_user(val, prop_values + copied))
+				return -EFAULT;
+
+			copied++;
+		}
+	}
+	*arg_count_props = props_count;
+
+	return 0;
+}
+
+/**
+ * drm_mode_obj_get_properties_ioctl - get the current value of a object's property
+ * @dev: DRM device
+ * @data: ioctl data
+ * @file_priv: DRM file info
+ *
+ * This function retrieves the current value for an object's property. Compared
+ * to the connector specific ioctl this one is extended to also work on crtc and
+ * plane objects.
+ *
+ * Called by the user via ioctl.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
+				      struct drm_file *file_priv)
+{
+	struct drm_mode_obj_get_properties *arg = data;
+	struct drm_mode_object *obj;
+	int ret = 0;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	drm_modeset_lock_all(dev);
+
+	obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
+	if (!obj) {
+		ret = -ENOENT;
+		goto out;
+	}
+	if (!obj->properties) {
+		ret = -EINVAL;
+		goto out_unref;
+	}
+
+	ret = drm_mode_object_get_properties(obj, file_priv->atomic,
+			(uint32_t __user *)(unsigned long)(arg->props_ptr),
+			(uint64_t __user *)(unsigned long)(arg->prop_values_ptr),
+			&arg->count_props);
+
+out_unref:
+	drm_mode_object_unreference(obj);
+out:
+	drm_modeset_unlock_all(dev);
+	return ret;
+}
+
+int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
+				    struct drm_file *file_priv)
+{
+	struct drm_mode_obj_set_property *arg = data;
+	struct drm_mode_object *arg_obj;
+	struct drm_mode_object *prop_obj;
+	struct drm_property *property;
+	int i, ret = -EINVAL;
+	struct drm_mode_object *ref;
+
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -EINVAL;
+
+	drm_modeset_lock_all(dev);
+
+	arg_obj = drm_mode_object_find(dev, arg->obj_id, arg->obj_type);
+	if (!arg_obj) {
+		ret = -ENOENT;
+		goto out;
+	}
+	if (!arg_obj->properties)
+		goto out_unref;
+
+	for (i = 0; i < arg_obj->properties->count; i++)
+		if (arg_obj->properties->properties[i]->base.id == arg->prop_id)
+			break;
+
+	if (i == arg_obj->properties->count)
+		goto out_unref;
+
+	prop_obj = drm_mode_object_find(dev, arg->prop_id,
+					DRM_MODE_OBJECT_PROPERTY);
+	if (!prop_obj) {
+		ret = -ENOENT;
+		goto out_unref;
+	}
+	property = obj_to_property(prop_obj);
+
+	if (!drm_property_change_valid_get(property, arg->value, &ref))
+		goto out_unref;
+
+	switch (arg_obj->type) {
+	case DRM_MODE_OBJECT_CONNECTOR:
+		ret = drm_mode_connector_set_obj_prop(arg_obj, property,
+						      arg->value);
+		break;
+	case DRM_MODE_OBJECT_CRTC:
+		ret = drm_mode_crtc_set_obj_prop(arg_obj, property, arg->value);
+		break;
+	case DRM_MODE_OBJECT_PLANE:
+		ret = drm_mode_plane_set_obj_prop(obj_to_plane(arg_obj),
+						  property, arg->value);
+		break;
+	}
+
+	drm_property_change_valid_put(property, ref);
+
+out_unref:
+	drm_mode_object_unreference(arg_obj);
+out:
+	drm_modeset_unlock_all(dev);
+	return ret;
+}