/* SPDX-License-Identifier: GPL-2.0 */

  /*
   * include/linux/node.h - generic node definition
   *
   * This is mainly for topological representation. We define the 
   * basic 'struct node' here, which can be embedded in per-arch 
   * definitions of processors.
   *
   * Basic handling of the devices is done in drivers/base/node.c
   * and system devices are handled in drivers/base/sys.c. 
   *
   * Nodes are exported via driverfs in the class/node/devices/
   * directory. 

   */
  #ifndef _LINUX_NODE_H_
  #define _LINUX_NODE_H_

  #include <linux/device.h>

  #include <linux/cpumask.h>

  #include <linux/workqueue.h>

  
  struct node {

  	struct device	dev;

  
  #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
  	struct work_struct	node_work;
  #endif

  };

  struct memory_block;

  extern struct node *node_devices[];

  typedef  void (*node_registration_func_t)(struct node *);

  #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
  extern int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages);
  #else
  static inline int link_mem_sections(int nid, unsigned long start_pfn, unsigned long nr_pages)
  {
  	return 0;
  }
  #endif

  extern void unregister_node(struct node *node);

  #ifdef CONFIG_NUMA

  /* Core of the node registration - only memory hotplug should use this */
  extern int __register_one_node(int nid);
  
  /* Registers an online node */
  static inline int register_one_node(int nid)
  {
  	int error = 0;
  
  	if (node_online(nid)) {
  		struct pglist_data *pgdat = NODE_DATA(nid);
  
  		error = __register_one_node(nid);
  		if (error)
  			return error;
  		/* link memory sections under this node */
  		error = link_mem_sections(nid, pgdat->node_start_pfn, pgdat->node_spanned_pages);
  	}
  
  	return error;
  }

  extern void unregister_one_node(int nid);

  extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
  extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);

  extern int register_mem_sect_under_node(struct memory_block *mem_blk,
  						int nid);

  extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
  					   unsigned long phys_index);

  
  #ifdef CONFIG_HUGETLBFS
  extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
  					 node_registration_func_t unregister);
  #endif

  #else

  static inline int __register_one_node(int nid)
  {
  	return 0;
  }

  static inline int register_one_node(int nid)
  {
  	return 0;
  }
  static inline int unregister_one_node(int nid)
  {
  	return 0;
  }

  static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
  {
  	return 0;
  }
  static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
  {
  	return 0;
  }

  static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
  							int nid)
  {
  	return 0;
  }

  static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
  						  unsigned long phys_index)

  {
  	return 0;
  }

  
  static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
  						node_registration_func_t unreg)
  {
  }

  #endif

  #define to_node(device) container_of(device, struct node, dev)

  
  #endif /* _LINUX_NODE_H_ */