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/*
  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 */
  42DECLARE_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 */
  48extern int __cpu_to_node(int cpu);
  49#define cpu_to_node __cpu_to_node
  50
  51extern 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 */
  56static 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. */
  64extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
  65
  66#ifdef CONFIG_DEBUG_PER_CPU_MAPS
  67extern const struct cpumask *cpumask_of_node(int node);
  68#else
  69/* Returns a pointer to the cpumask of CPUs on Node 'node'. */
  70static inline const struct cpumask *cpumask_of_node(int node)
  71{
  72        return node_to_cpumask_map[node];
  73}
  74#endif
  75
  76extern 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
  86extern int __node_distance(int, int);
  87#define node_distance(a, b) __node_distance(a, b)
  88
  89#else /* !CONFIG_NUMA */
  90
  91static 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
 100static inline int early_cpu_to_node(int cpu)
 101{
 102        return 0;
 103}
 104
 105static inline void setup_node_to_cpumask_map(void) { }
 106
 107#endif
 108
 109#include <asm-generic/topology.h>
 110
 111extern 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
 121extern unsigned int __max_logical_packages;
 122#define topology_max_packages()                 (__max_logical_packages)
 123
 124extern int __max_smt_threads;
 125
 126static inline int topology_max_smt_threads(void)
 127{
 128        return __max_smt_threads;
 129}
 130
 131int topology_update_package_map(unsigned int apicid, unsigned int cpu);
 132extern int topology_phys_to_logical_pkg(unsigned int pkg);
 133#else
 134#define topology_max_packages()                 (1)
 135static inline int
 136topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; }
 137static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }
 138static inline int topology_max_smt_threads(void) { return 1; }
 139#endif
 140
 141static inline void arch_fix_phys_package_id(int num, u32 slot)
 142{
 143}
 144
 145struct pci_bus;
 146int x86_pci_root_bus_node(int bus);
 147void x86_pci_root_bus_resources(int bus, struct list_head *resources);
 148
 149extern bool x86_topology_update;
 150
 151#ifdef CONFIG_SCHED_MC_PRIO
 152#include <asm/percpu.h>
 153
 154DECLARE_PER_CPU_READ_MOSTLY(int, sched_core_priority);
 155extern unsigned int __read_mostly sysctl_sched_itmt_enabled;
 156
 157/* Interface to set priority of a cpu */
 158void sched_set_itmt_core_prio(int prio, int core_cpu);
 159
 160/* Interface to notify scheduler that system supports ITMT */
 161int sched_set_itmt_support(void);
 162
 163/* Interface to notify scheduler that system revokes ITMT support */
 164void sched_clear_itmt_support(void);
 165
 166#else /* CONFIG_SCHED_MC_PRIO */
 167
 168#define sysctl_sched_itmt_enabled       0
 169static inline void sched_set_itmt_core_prio(int prio, int core_cpu)
 170{
 171}
 172static inline int sched_set_itmt_support(void)
 173{
 174        return 0;
 175}
 176static inline void sched_clear_itmt_support(void)
 177{
 178}
 179#endif /* CONFIG_SCHED_MC_PRIO */
 180
 181#endif /* _ASM_X86_TOPOLOGY_H */
 182