#ifndef _DRM_AGPSUPPORT_H_
  #define _DRM_AGPSUPPORT_H_

  #include <linux/agp_backend.h>

  #include <linux/kernel.h>

  #include <linux/list.h>

  #include <linux/mm.h>
  #include <linux/mutex.h>
  #include <linux/types.h>

  #include <uapi/drm/drm.h>
  
  struct drm_device;
  struct drm_file;

  struct drm_agp_head {
  	struct agp_kern_info agp_info;
  	struct list_head memory;
  	unsigned long mode;
  	struct agp_bridge_data *bridge;
  	int enabled;
  	int acquired;
  	unsigned long base;
  	int agp_mtrr;
  	int cant_use_aperture;
  	unsigned long page_mask;
  };

  #if IS_ENABLED(CONFIG_AGP)

  void drm_free_agp(struct agp_memory * handle, int pages);
  int drm_bind_agp(struct agp_memory * handle, unsigned int start);
  int drm_unbind_agp(struct agp_memory * handle);
  struct agp_memory *drm_agp_bind_pages(struct drm_device *dev,

  				struct page **pages,
  				unsigned long num_pages,
  				uint32_t gtt_offset,
  				uint32_t type);
  
  struct drm_agp_head *drm_agp_init(struct drm_device *dev);

  void drm_legacy_agp_clear(struct drm_device *dev);

  int drm_agp_acquire(struct drm_device *dev);
  int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
  			  struct drm_file *file_priv);
  int drm_agp_release(struct drm_device *dev);
  int drm_agp_release_ioctl(struct drm_device *dev, void *data,
  			  struct drm_file *file_priv);
  int drm_agp_enable(struct drm_device *dev, struct drm_agp_mode mode);
  int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
  			 struct drm_file *file_priv);
  int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info);
  int drm_agp_info_ioctl(struct drm_device *dev, void *data,
  		       struct drm_file *file_priv);
  int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request);
  int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
  			struct drm_file *file_priv);
  int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request);
  int drm_agp_free_ioctl(struct drm_device *dev, void *data,
  		       struct drm_file *file_priv);
  int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request);
  int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
  			 struct drm_file *file_priv);
  int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request);
  int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
  		       struct drm_file *file_priv);

  #else /* CONFIG_AGP */

  static inline void drm_free_agp(struct agp_memory * handle, int pages)

  {
  }

  static inline int drm_bind_agp(struct agp_memory * handle, unsigned int start)

  {
  	return -ENODEV;
  }

  static inline int drm_unbind_agp(struct agp_memory * handle)

  {
  	return -ENODEV;
  }

  static inline struct agp_memory *drm_agp_bind_pages(struct drm_device *dev,

  					      struct page **pages,
  					      unsigned long num_pages,
  					      uint32_t gtt_offset,
  					      uint32_t type)
  {
  	return NULL;
  }
  
  static inline struct drm_agp_head *drm_agp_init(struct drm_device *dev)
  {
  	return NULL;
  }

  static inline void drm_legacy_agp_clear(struct drm_device *dev)

  {
  }
  
  static inline int drm_agp_acquire(struct drm_device *dev)
  {
  	return -ENODEV;
  }

  static inline int drm_agp_release(struct drm_device *dev)
  {
  	return -ENODEV;
  }

  static inline int drm_agp_enable(struct drm_device *dev,
  				 struct drm_agp_mode mode)
  {
  	return -ENODEV;
  }

  static inline int drm_agp_info(struct drm_device *dev,
  			       struct drm_agp_info *info)
  {
  	return -ENODEV;
  }

  static inline int drm_agp_alloc(struct drm_device *dev,
  				struct drm_agp_buffer *request)
  {
  	return -ENODEV;
  }

  static inline int drm_agp_free(struct drm_device *dev,
  			       struct drm_agp_buffer *request)
  {
  	return -ENODEV;
  }

  static inline int drm_agp_unbind(struct drm_device *dev,
  				 struct drm_agp_binding *request)
  {
  	return -ENODEV;
  }

  static inline int drm_agp_bind(struct drm_device *dev,
  			       struct drm_agp_binding *request)
  {
  	return -ENODEV;
  }

  #endif /* CONFIG_AGP */

  
  #endif /* _DRM_AGPSUPPORT_H_ */