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 #include <asm/percpu.h>
  40
  41 /* Mappings between logical cpu number and node number */
  42 DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
  43
  44 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  45 /*
  46  * override generic percpu implementation of cpu_to_node
  47  */
  48 extern int __cpu_to_node(int cpu);
  49 #define cpu_to_node __cpu_to_node
  50
  51 extern int early_cpu_to_node(int cpu);
  52
  53 #else   /* !CONFIG_DEBUG_PER_CPU_MAPS */
  54
  55 /* Same function but used if called before per_cpu areas are setup */
  56 static inline int early_cpu_to_node(int cpu)
  57 {
  58         return early_per_cpu(x86_cpu_to_node_map, cpu);
  59 }
  60
  61 #endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
  62
  63 /* Mappings between node number and cpus on that node. */
  64 extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
  65
  66 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  67 extern const struct cpumask *cpumask_of_node(int node);
  68 #else
  69 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
  70 static inline const struct cpumask *cpumask_of_node(int node)
  71 {
  72         return node_to_cpumask_map[node];
  73 }
  74 #endif
  75
  76 extern void setup_node_to_cpumask_map(void);
  77
  78 /*
  79  * Returns the number of the node containing Node 'node'. This
  80  * architecture is flat, so it is a pretty simple function!
  81  */
  82 #define parent_node(node) (node)
  83
  84 #define pcibus_to_node(bus) __pcibus_to_node(bus)
  85
  86 extern int __node_distance(int, int);
  87 #define node_distance(a, b) __node_distance(a, b)
  88
  89 #else /* !CONFIG_NUMA */
  90
  91 static inline int numa_node_id(void)
  92 {
  93         return 0;
  94 }
  95 /*
  96  * indicate override:
  97  */
  98 #define numa_node_id numa_node_id
  99
 100 static inline int early_cpu_to_node(int cpu)
 101 {
 102         return 0;
 103 }
 104
 105 static inline void setup_node_to_cpumask_map(void) { }
 106
 107 #endif
 108
 109 #include <asm-generic/topology.h>
 110
 111 extern const struct cpumask *cpu_coregroup_mask(int cpu);
 112
 113 #define topology_logical_package_id(cpu)        (cpu_data(cpu).logical_proc_id)
 114 #define topology_physical_package_id(cpu)       (cpu_data(cpu).phys_proc_id)
 115 #define topology_core_id(cpu)                   (cpu_data(cpu).cpu_core_id)
 116
 117 #ifdef CONFIG_SMP
 118 #define topology_core_cpumask(cpu)              (per_cpu(cpu_core_map, cpu))
 119 #define topology_sibling_cpumask(cpu)           (per_cpu(cpu_sibling_map, cpu))
 120
 121 extern unsigned int __max_logical_packages;
 122 #define topology_max_packages()                 (__max_logical_packages)
 123
 124 extern int __max_smt_threads;
 125
 126 static inline int topology_max_smt_threads(void)
 127 {
 128         return __max_smt_threads;
 129 }
 130
 131 int topology_update_package_map(unsigned int apicid, unsigned int cpu);
 132 extern int topology_phys_to_logical_pkg(unsigned int pkg);
 133 #else
 134 #define topology_max_packages()                 (1)
 135 static inline int
 136 topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; }
 137 static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }
 138 static inline int topology_max_smt_threads(void) { return 1; }
 139 #endif
 140
 141 static inline void arch_fix_phys_package_id(int num, u32 slot)
 142 {
 143 }
 144
 145 struct pci_bus;
 146 int x86_pci_root_bus_node(int bus);
 147 void x86_pci_root_bus_resources(int bus, struct list_head *resources);
 148
 149 extern bool x86_topology_update;
 150
 151 #ifdef CONFIG_SCHED_MC_PRIO
 152 #include <asm/percpu.h>
 153
 154 DECLARE_PER_CPU_READ_MOSTLY(int, sched_core_priority);
 155 extern unsigned int __read_mostly sysctl_sched_itmt_enabled;
 156
 157 /* Interface to set priority of a cpu */
 158 void sched_set_itmt_core_prio(int prio, int core_cpu);
 159
 160 /* Interface to notify scheduler that system supports ITMT */
 161 int sched_set_itmt_support(void);
 162
 163 /* Interface to notify scheduler that system revokes ITMT support */
 164 void sched_clear_itmt_support(void);
 165
 166 #else /* CONFIG_SCHED_MC_PRIO */
 167
 168 #define sysctl_sched_itmt_enabled       0
 169 static inline void sched_set_itmt_core_prio(int prio, int core_cpu)
 170 {
 171 }
 172 static inline int sched_set_itmt_support(void)
 173 {
 174         return 0;
 175 }
 176 static inline void sched_clear_itmt_support(void)
 177 {
 178 }
 179 #endif /* CONFIG_SCHED_MC_PRIO */
 180
 181 #endif /* _ASM_X86_TOPOLOGY_H */