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 */
  51 DECLARE_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  */
  57 extern int __cpu_to_node(int cpu);
  58 #define cpu_to_node __cpu_to_node
  59
  60 extern 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 */
  65 static 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. */
  73 extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
  74
  75 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  76 extern const struct cpumask *cpumask_of_node(int node);
  77 #else
  78 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
  79 static inline const struct cpumask *cpumask_of_node(int node)
  80 {
  81         return node_to_cpumask_map[node];
  82 }
  83 #endif
  84
  85 extern 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
  95 extern int __node_distance(int, int);
  96 #define node_distance(a, b) __node_distance(a, b)
  97
  98 #else /* !CONFIG_NUMA */
  99
 100 static 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
 109 static inline int early_cpu_to_node(int cpu)
 110 {
 111         return 0;
 112 }
 113
 114 static inline void setup_node_to_cpumask_map(void) { }
 115
 116 #endif
 117
 118 #include <asm-generic/topology.h>
 119
 120 extern const struct cpumask *cpu_coregroup_mask(int cpu);
 121
 122 #define topology_physical_package_id(cpu)       (cpu_data(cpu).phys_proc_id)
 123 #define topology_core_id(cpu)                   (cpu_data(cpu).cpu_core_id)
 124
 125 #ifdef ENABLE_TOPO_DEFINES
 126 #define topology_core_cpumask(cpu)              (per_cpu(cpu_core_map, cpu))
 127 #define topology_thread_cpumask(cpu)            (per_cpu(cpu_sibling_map, cpu))
 128 #endif
 129
 130 static inline void arch_fix_phys_package_id(int num, u32 slot)
 131 {
 132 }
 133
 134 struct pci_bus;
 135 void x86_pci_root_bus_resources(int bus, struct list_head *resources);
 136
 137 #ifdef CONFIG_SMP
 138 #define mc_capable()    ((boot_cpu_data.x86_max_cores > 1) && \
 139                         (cpumask_weight(cpu_core_mask(0)) != nr_cpu_ids))
 140 #define smt_capable()                   (smp_num_siblings > 1)
 141 #endif
 142
 143 #ifdef CONFIG_NUMA
 144 extern int get_mp_bus_to_node(int busnum);
 145 extern void set_mp_bus_to_node(int busnum, int node);
 146 #else
 147 static inline int get_mp_bus_to_node(int busnum)
 148 {
 149         return 0;
 150 }
 151 static inline void set_mp_bus_to_node(int busnum, int node)
 152 {
 153 }
 154 #endif
 155
 156 #endif /* _ASM_X86_TOPOLOGY_H */