/* * 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/drm_atomic.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_add(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_add - 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. * * Returns: * Zero on success, error code on failure. */int drm_mode_object_add(struct drm_device *dev,			struct drm_mode_object *obj, uint32_t obj_type){	return __drm_mode_object_add(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_put(). */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_put - release a mode object reference * @obj: DRM mode object * * This function 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_get(). */void drm_mode_object_put(struct drm_mode_object *obj){	if (obj->free_cb) {		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));		kref_put(&obj->refcount, obj->free_cb);	}}EXPORT_SYMBOL(drm_mode_object_put); /** * drm_mode_object_get - acquire a mode object reference * @obj: DRM mode object * * This function 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_put(). */void drm_mode_object_get(struct drm_mode_object *obj){	if (obj->free_cb) {		DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));		kref_get(&obj->refcount);	}}EXPORT_SYMBOL(drm_mode_object_get); /** * 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++;}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 function 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. * * Note that atomic drivers should not have any need to call this, the core will * ensure consistency of values reported back to userspace through the * appropriate ->atomic_get_property callback. Only legacy drivers should call * this function to update the tracked value (after clamping and other * restrictions have been applied). * * 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. * * Atomic drivers should never call this function directly, the core will read * out property values through the various ->atomic_get_property callbacks. * * 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_drv_uses_atomic_modeset(property->dev) &&			!(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 i, ret, count; 	for (i = 0, count = 0; i < obj->properties->count; i++) {		struct drm_property *prop = obj->properties->properties[i];		uint64_t val; 		if ((prop->flags & DRM_MODE_PROP_ATOMIC) && !atomic)			continue; 		if (*arg_count_props > count) {			ret = drm_object_property_get_value(obj, prop, &val);			if (ret)				return ret; 			if (put_user(prop->base.id, prop_ptr + count))				return -EFAULT; 			if (put_user(val, prop_values + count))				return -EFAULT;		} 		count++;	}	*arg_count_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_put(obj);out:	drm_modeset_unlock_all(dev);	return ret;} struct drm_property *drm_mode_obj_find_prop_id(struct drm_mode_object *obj,					       uint32_t prop_id){	int i; 	for (i = 0; i < obj->properties->count; i++)		if (obj->properties->properties[i]->base.id == prop_id)			return obj->properties->properties[i]; 	return NULL;} 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_property *property;	int 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; 	property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);	if (!property)		goto out_unref; 	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_put(arg_obj);out:	drm_modeset_unlock_all(dev);	return ret;}