#ifndef _DRM_AUTH_H_
  #define _DRM_AUTH_H_

  /*
   * Internal Header for the Direct Rendering Manager
   *
   * Copyright 2016 Intel Corporation
   *
   * Author: Daniel Vetter <daniel.vetter@ffwll.ch>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
   * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   * OTHER DEALINGS IN THE SOFTWARE.
   */

  #include <linux/idr.h>
  #include <linux/kref.h>
  #include <linux/wait.h>
  
  struct drm_file;
  struct drm_hw_lock;

  /*
   * Legacy DRI1 locking data structure. Only here instead of in drm_legacy.h for
   * include ordering reasons.
   *
   * DO NOT USE.
   */
  struct drm_lock_data {
  	struct drm_hw_lock *hw_lock;
  	struct drm_file *file_priv;
  	wait_queue_head_t lock_queue;
  	unsigned long lock_time;
  	spinlock_t spinlock;
  	uint32_t kernel_waiters;
  	uint32_t user_waiters;
  	int idle_has_lock;
  };

  /**
   * struct drm_master - drm master structure
   *
   * @refcount: Refcount for this master object.
   * @dev: Link back to the DRM device

   * @driver_priv: Pointer to driver-private information.

   * @lessor: Lease holder
   * @lessee_id: id for lessees. Owners always have id 0
   * @lessee_list: other lessees of the same master
   * @lessees: drm_masters leasing from this one
   * @leases: Objects leased to this drm_master.
   * @lessee_idr: All lessees under this owner (only used where lessor == NULL)

   *
   * Note that master structures are only relevant for the legacy/primary device
   * nodes, hence there can only be one per device, not one per drm_minor.
   */
  struct drm_master {
  	struct kref refcount;
  	struct drm_device *dev;

  	/**

  	 * @unique: Unique identifier: e.g. busid. Protected by
  	 * &drm_device.master_mutex.

  	 */

  	char *unique;

  	/**

  	 * @unique_len: Length of unique field. Protected by
  	 * &drm_device.master_mutex.

  	 */

  	int unique_len;

  	/**

  	 * @magic_map: Map of used authentication tokens. Protected by
  	 * &drm_device.master_mutex.

  	 */

  	struct idr magic_map;

  	void *driver_priv;

  
  	/* Tree of display resource leases, each of which is a drm_master struct
  	 * All of these get activated simultaneously, so drm_device master points
  	 * at the top of the tree (for which lessor is NULL). Protected by
  	 * &drm_device.mode_config.idr_mutex.
  	 */
  
  	struct drm_master *lessor;
  	int	lessee_id;
  	struct list_head lessee_list;
  	struct list_head lessees;
  	struct idr leases;
  	struct idr lessee_idr;

  	/* private: */
  #if IS_ENABLED(CONFIG_DRM_LEGACY)
  	struct drm_lock_data lock;
  #endif

  };
  
  struct drm_master *drm_master_get(struct drm_master *master);
  void drm_master_put(struct drm_master **master);
  bool drm_is_current_master(struct drm_file *fpriv);

  struct drm_master *drm_master_create(struct drm_device *dev);

  #endif