LXR linux/arch/x86/include/asm/topology.h

   1/*
   2 * Written by: Matthew Dobson, IBM Corporation
   3 *
   4 * Copyright (C) 2002, IBM Corp.
   5 *
   6 * All rights reserved.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  16 * NON INFRINGEMENT.  See the GNU General Public License for more
  17 * details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 *
  23 * Send feedback to <colpatch@us.ibm.com>
  24 */
  25#ifndef _ASM_X86_TOPOLOGY_H
  26#define _ASM_X86_TOPOLOGY_H
  27
  28#ifdef CONFIG_X86_32
  29# ifdef CONFIG_X86_HT
  30#  define ENABLE_TOPO_DEFINES
  31# endif
  32#else
  33# ifdef CONFIG_SMP
  34#  define ENABLE_TOPO_DEFINES
  35# endif
  36#endif
  37
  38/*
  39 * to preserve the visibility of NUMA_NO_NODE definition,
  40 * moved to there from here.  May be used independent of
  41 * CONFIG_NUMA.
  42 */
  43#include <linux/numa.h>
  44
  45#ifdef CONFIG_NUMA
  46#include <linux/cpumask.h>
  47
  48#include <asm/mpspec.h>
  49
  50/* Mappings between logical cpu number and node number */
  51DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
  52
  53#ifdef CONFIG_DEBUG_PER_CPU_MAPS
  54/*
  55 * override generic percpu implementation of cpu_to_node
  56 */
  57extern int __cpu_to_node(int cpu);
  58#define cpu_to_node __cpu_to_node
  59
  60extern int early_cpu_to_node(int cpu);
  61
  62#else   /* !CONFIG_DEBUG_PER_CPU_MAPS */
  63
  64/* Same function but used if called before per_cpu areas are setup */
  65static inline int early_cpu_to_node(int cpu)
  66{
  67        return early_per_cpu(x86_cpu_to_node_map, cpu);
  68}
  69
  70#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
  71
  72/* Mappings between node number and cpus on that node. */
  73extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
  74
  75#ifdef CONFIG_DEBUG_PER_CPU_MAPS
  76extern const struct cpumask *cpumask_of_node(int node);
  77#else
  78/* Returns a pointer to the cpumask of CPUs on Node 'node'. */
  79static inline const struct cpumask *cpumask_of_node(int node)
  80{
  81        return node_to_cpumask_map[node];
  82}
  83#endif
  84
  85extern void setup_node_to_cpumask_map(void);
  86
  87/*
  88 * Returns the number of the node containing Node 'node'. This
  89 * architecture is flat, so it is a pretty simple function!
  90 */
  91#define parent_node(node) (node)
  92
  93#define pcibus_to_node(bus) __pcibus_to_node(bus)
  94
  95extern int __node_distance(int, int);
  96#define node_distance(a, b) __node_distance(a, b)
  97
  98#else /* !CONFIG_NUMA */
  99
 100static inline int numa_node_id(void)
 101{
 102        return 0;
 103}
 104/*
 105 * indicate override:
 106 */
 107#define numa_node_id numa_node_id
 108
 109static inline int early_cpu_to_node(int cpu)
 110{
 111        return 0;
 112}
 113
 114static inline void setup_node_to_cpumask_map(void) { }
 115
 116#endif
 117
 118#include <asm-generic/topology.h>
 119
 120extern const struct cpumask *cpu_coregroup_mask(int cpu);
 121
 122#ifdef ENABLE_TOPO_DEFINES
 123#define topology_physical_package_id(cpu)       (cpu_data(cpu).phys_proc_id)
 124#define topology_core_id(cpu)                   (cpu_data(cpu).cpu_core_id)
 125#define topology_core_cpumask(cpu)              (per_cpu(cpu_core_map, cpu))
 126#define topology_thread_cpumask(cpu)            (per_cpu(cpu_sibling_map, cpu))
 127
 128/* indicates that pointers to the topology cpumask_t maps are valid */
 129#define arch_provides_topology_pointers         yes
 130#endif
 131
 132static inline void arch_fix_phys_package_id(int num, u32 slot)
 133{
 134}
 135
 136struct pci_bus;
 137void x86_pci_root_bus_resources(int bus, struct list_head *resources);
 138
 139#ifdef CONFIG_SMP
 140#define mc_capable()    ((boot_cpu_data.x86_max_cores > 1) && \
 141                        (cpumask_weight(cpu_core_mask(0)) != nr_cpu_ids))
 142#define smt_capable()                   (smp_num_siblings > 1)
 143#endif
 144
 145#ifdef CONFIG_NUMA
 146extern int get_mp_bus_to_node(int busnum);
 147extern void set_mp_bus_to_node(int busnum, int node);
 148#else
 149static inline int get_mp_bus_to_node(int busnum)
 150{
 151        return 0;
 152}
 153static inline void set_mp_bus_to_node(int busnum, int node)
 154{
 155}
 156#endif
 157
 158#endif /* _ASM_X86_TOPOLOGY_H */
 159