/*
   * include/linux/topology.h
   *
   * Written by: Matthew Dobson, IBM Corporation
   *
   * Copyright (C) 2002, IBM Corp.
   *

   * All rights reserved.

   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
   * NON INFRINGEMENT.  See the GNU General Public License for more
   * details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   *
   * Send feedback to <colpatch@us.ibm.com>
   */
  #ifndef _LINUX_TOPOLOGY_H
  #define _LINUX_TOPOLOGY_H
  
  #include <linux/cpumask.h>
  #include <linux/bitops.h>
  #include <linux/mmzone.h>
  #include <linux/smp.h>

  #include <linux/percpu.h>

  #include <asm/topology.h>

  #ifndef nr_cpus_node

  #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))

  #endif

  #define for_each_node_with_cpus(node)			\
  	for_each_online_node(node)			\

  		if (nr_cpus_node(node))

  int arch_update_cpu_topology(void);

  /* Conform to ACPI 2.0 SLIT distance definitions */
  #define LOCAL_DISTANCE		10
  #define REMOTE_DISTANCE		20

  #ifndef node_distance

  #define node_distance(from,to)	((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
  #endif

  #ifndef RECLAIM_DISTANCE
  /*
   * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
   * (in whatever arch specific measurement units returned by node_distance())

   * and node_reclaim_mode is enabled then the VM will only call node_reclaim()

   * on nodes within this distance.

   */

  #define RECLAIM_DISTANCE 30

  #endif

  #ifndef PENALTY_FOR_NODE_WITH_CPUS
  #define PENALTY_FOR_NODE_WITH_CPUS	(1)
  #endif

  #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
  DECLARE_PER_CPU(int, numa_node);
  
  #ifndef numa_node_id
  /* Returns the number of the current Node. */
  static inline int numa_node_id(void)
  {

  	return raw_cpu_read(numa_node);

  }
  #endif
  
  #ifndef cpu_to_node
  static inline int cpu_to_node(int cpu)
  {
  	return per_cpu(numa_node, cpu);
  }
  #endif
  
  #ifndef set_numa_node
  static inline void set_numa_node(int node)
  {

  	this_cpu_write(numa_node, node);

  }
  #endif
  
  #ifndef set_cpu_numa_node
  static inline void set_cpu_numa_node(int cpu, int node)
  {
  	per_cpu(numa_node, cpu) = node;
  }
  #endif
  
  #else	/* !CONFIG_USE_PERCPU_NUMA_NODE_ID */
  
  /* Returns the number of the current Node. */
  #ifndef numa_node_id
  static inline int numa_node_id(void)
  {
  	return cpu_to_node(raw_smp_processor_id());
  }
  #endif
  
  #endif	/* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */

  #ifdef CONFIG_HAVE_MEMORYLESS_NODES
  
  /*
   * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
   * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
   * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
   */
  DECLARE_PER_CPU(int, _numa_mem_);

  extern int _node_numa_mem_[MAX_NUMNODES];

  
  #ifndef set_numa_mem
  static inline void set_numa_mem(int node)
  {

  	this_cpu_write(_numa_mem_, node);

  	_node_numa_mem_[numa_node_id()] = node;
  }
  #endif
  
  #ifndef node_to_mem_node
  static inline int node_to_mem_node(int node)
  {
  	return _node_numa_mem_[node];

  }
  #endif
  
  #ifndef numa_mem_id
  /* Returns the number of the nearest Node with memory */
  static inline int numa_mem_id(void)
  {

  	return raw_cpu_read(_numa_mem_);

  }
  #endif
  
  #ifndef cpu_to_mem
  static inline int cpu_to_mem(int cpu)
  {
  	return per_cpu(_numa_mem_, cpu);
  }
  #endif
  
  #ifndef set_cpu_numa_mem
  static inline void set_cpu_numa_mem(int cpu, int node)
  {
  	per_cpu(_numa_mem_, cpu) = node;

  	_node_numa_mem_[cpu_to_node(cpu)] = node;

  }
  #endif
  
  #else	/* !CONFIG_HAVE_MEMORYLESS_NODES */

  #ifndef numa_mem_id
  /* Returns the number of the nearest Node with memory */
  static inline int numa_mem_id(void)
  {
  	return numa_node_id();
  }
  #endif

  #ifndef node_to_mem_node
  static inline int node_to_mem_node(int node)
  {
  	return node;
  }
  #endif

  #ifndef cpu_to_mem
  static inline int cpu_to_mem(int cpu)
  {
  	return cpu_to_node(cpu);
  }
  #endif
  
  #endif	/* [!]CONFIG_HAVE_MEMORYLESS_NODES */

  #ifndef topology_physical_package_id
  #define topology_physical_package_id(cpu)	((void)(cpu), -1)
  #endif
  #ifndef topology_core_id
  #define topology_core_id(cpu)			((void)(cpu), 0)
  #endif

  #ifndef topology_sibling_cpumask
  #define topology_sibling_cpumask(cpu)		cpumask_of(cpu)

  #endif
  #ifndef topology_core_cpumask
  #define topology_core_cpumask(cpu)		cpumask_of(cpu)
  #endif

  #ifdef CONFIG_SCHED_SMT
  static inline const struct cpumask *cpu_smt_mask(int cpu)
  {

  	return topology_sibling_cpumask(cpu);

  }
  #endif
  
  static inline const struct cpumask *cpu_cpu_mask(int cpu)
  {
  	return cpumask_of_node(cpu_to_node(cpu));
  }

  #endif /* _LINUX_TOPOLOGY_H */