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 /*
  29  * to preserve the visibility of NUMA_NO_NODE definition,
  30  * moved to there from here.  May be used independent of
  31  * CONFIG_NUMA.
  32  */
  33 #include <linux/numa.h>
  34
  35 #ifdef CONFIG_NUMA
  36 #include <linux/cpumask.h>
  37
  38 #include <asm/mpspec.h>
  39
  40 /* Mappings between logical cpu number and node number */
  41 DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
  42
  43 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  44 /*
  45  * override generic percpu implementation of cpu_to_node
  46  */
  47 extern int __cpu_to_node(int cpu);
  48 #define cpu_to_node __cpu_to_node
  49
  50 extern int early_cpu_to_node(int cpu);
  51
  52 #else   /* !CONFIG_DEBUG_PER_CPU_MAPS */
  53
  54 /* Same function but used if called before per_cpu areas are setup */
  55 static inline int early_cpu_to_node(int cpu)
  56 {
  57         return early_per_cpu(x86_cpu_to_node_map, cpu);
  58 }
  59
  60 #endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
  61
  62 /* Mappings between node number and cpus on that node. */
  63 extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
  64
  65 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  66 extern const struct cpumask *cpumask_of_node(int node);
  67 #else
  68 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
  69 static inline const struct cpumask *cpumask_of_node(int node)
  70 {
  71         return node_to_cpumask_map[node];
  72 }
  73 #endif
  74
  75 extern void setup_node_to_cpumask_map(void);
  76
  77 /*
  78  * Returns the number of the node containing Node 'node'. This
  79  * architecture is flat, so it is a pretty simple function!
  80  */
  81 #define parent_node(node) (node)
  82
  83 #define pcibus_to_node(bus) __pcibus_to_node(bus)
  84
  85 extern int __node_distance(int, int);
  86 #define node_distance(a, b) __node_distance(a, b)
  87
  88 #else /* !CONFIG_NUMA */
  89
  90 static inline int numa_node_id(void)
  91 {
  92         return 0;
  93 }
  94 /*
  95  * indicate override:
  96  */
  97 #define numa_node_id numa_node_id
  98
  99 static inline int early_cpu_to_node(int cpu)
 100 {
 101         return 0;
 102 }
 103
 104 static inline void setup_node_to_cpumask_map(void) { }
 105
 106 #endif
 107
 108 #include <asm-generic/topology.h>
 109
 110 extern const struct cpumask *cpu_coregroup_mask(int cpu);
 111
 112 #define topology_logical_package_id(cpu)        (cpu_data(cpu).logical_proc_id)
 113 #define topology_physical_package_id(cpu)       (cpu_data(cpu).phys_proc_id)
 114 #define topology_core_id(cpu)                   (cpu_data(cpu).cpu_core_id)
 115
 116 #ifdef CONFIG_SMP
 117 #define topology_core_cpumask(cpu)              (per_cpu(cpu_core_map, cpu))
 118 #define topology_sibling_cpumask(cpu)           (per_cpu(cpu_sibling_map, cpu))
 119
 120 extern unsigned int __max_logical_packages;
 121 #define topology_max_packages()                 (__max_logical_packages)
 122
 123 extern int __max_smt_threads;
 124
 125 static inline int topology_max_smt_threads(void)
 126 {
 127         return __max_smt_threads;
 128 }
 129
 130 int topology_update_package_map(unsigned int apicid, unsigned int cpu);
 131 extern int topology_phys_to_logical_pkg(unsigned int pkg);
 132 #else
 133 #define topology_max_packages()                 (1)
 134 static inline int
 135 topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; }
 136 static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }
 137 static inline int topology_max_smt_threads(void) { return 1; }
 138 #endif
 139
 140 static inline void arch_fix_phys_package_id(int num, u32 slot)
 141 {
 142 }
 143
 144 struct pci_bus;
 145 int x86_pci_root_bus_node(int bus);
 146 void x86_pci_root_bus_resources(int bus, struct list_head *resources);
 147
 148 #endif /* _ASM_X86_TOPOLOGY_H */