include/asm-x86/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_NUMA
  29 #include <linux/cpumask.h>
  30 #include <asm/mpspec.h>
  31
  32 /* Mappings between logical cpu number and node number */
  33 extern int cpu_to_node_map[];
  34 extern cpumask_t node_to_cpumask_map[];
  35
  36 /* Returns the number of the node containing CPU 'cpu' */
  37 static inline int cpu_to_node(int cpu)
  38 {
  39         return cpu_to_node_map[cpu];
  40 }
  41
  42 /*
  43  * Returns the number of the node containing Node 'node'. This
  44  * architecture is flat, so it is a pretty simple function!
  45  */
  46 #define parent_node(node) (node)
  47
  48 /* Returns a bitmask of CPUs on Node 'node'. */
  49 static inline cpumask_t node_to_cpumask(int node)
  50 {
  51         return node_to_cpumask_map[node];
  52 }
  53
  54 /* Returns the number of the first CPU on Node 'node'. */
  55 static inline int node_to_first_cpu(int node)
  56 {
  57         cpumask_t mask = node_to_cpumask(node);
  58
  59         return first_cpu(mask);
  60 }
  61
  62 #define pcibus_to_node(bus) __pcibus_to_node(bus)
  63 #define pcibus_to_cpumask(bus) __pcibus_to_cpumask(bus)
  64
  65 #ifdef CONFIG_X86_32
  66 extern unsigned long node_start_pfn[];
  67 extern unsigned long node_end_pfn[];
  68 extern unsigned long node_remap_size[];
  69 #define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
  70
  71 # ifdef CONFIG_X86_HT
  72 #  define ENABLE_TOPO_DEFINES
  73 # endif
  74
  75 # define SD_CACHE_NICE_TRIES    1
  76 # define SD_IDLE_IDX            1
  77 # define SD_NEWIDLE_IDX         2
  78 # define SD_FORKEXEC_IDX        0
  79
  80 #else
  81
  82 # ifdef CONFIG_SMP
  83 #  define ENABLE_TOPO_DEFINES
  84 # endif
  85
  86 # define SD_CACHE_NICE_TRIES    2
  87 # define SD_IDLE_IDX            2
  88 # define SD_NEWIDLE_IDX         0
  89 # define SD_FORKEXEC_IDX        1
  90
  91 #endif
  92
  93 /* sched_domains SD_NODE_INIT for NUMAQ machines */
  94 #define SD_NODE_INIT (struct sched_domain) {            \
  95         .span                   = CPU_MASK_NONE,        \
  96         .parent                 = NULL,                 \
  97         .child                  = NULL,                 \
  98         .groups                 = NULL,                 \
  99         .min_interval           = 8,                    \
 100         .max_interval           = 32,                   \
 101         .busy_factor            = 32,                   \
 102         .imbalance_pct          = 125,                  \
 103         .cache_nice_tries       = SD_CACHE_NICE_TRIES,  \
 104         .busy_idx               = 3,                    \
 105         .idle_idx               = SD_IDLE_IDX,          \
 106         .newidle_idx            = SD_NEWIDLE_IDX,       \
 107         .wake_idx               = 1,                    \
 108         .forkexec_idx           = SD_FORKEXEC_IDX,      \
 109         .flags                  = SD_LOAD_BALANCE       \
 110                                 | SD_BALANCE_EXEC       \
 111                                 | SD_BALANCE_FORK       \
 112                                 | SD_SERIALIZE          \
 113                                 | SD_WAKE_BALANCE,      \
 114         .last_balance           = jiffies,              \
 115         .balance_interval       = 1,                    \
 116         .nr_balance_failed      = 0,                    \
 117 }
 118
 119 #ifdef CONFIG_X86_64_ACPI_NUMA
 120 extern int __node_distance(int, int);
 121 #define node_distance(a, b) __node_distance(a, b)
 122 #endif
 123
 124 #else /* CONFIG_NUMA */
 125
 126 #include <asm-generic/topology.h>
 127
 128 #endif
 129
 130 extern cpumask_t cpu_coregroup_map(int cpu);
 131
 132 #ifdef ENABLE_TOPO_DEFINES
 133 #define topology_physical_package_id(cpu)       (cpu_data(cpu).phys_proc_id)
 134 #define topology_core_id(cpu)                   (cpu_data(cpu).cpu_core_id)
 135 #define topology_core_siblings(cpu)             (per_cpu(cpu_core_map, cpu))
 136 #define topology_thread_siblings(cpu)           (per_cpu(cpu_sibling_map, cpu))
 137 #endif
 138
 139 #ifdef CONFIG_SMP
 140 #define mc_capable()                    (boot_cpu_data.x86_max_cores > 1)
 141 #define smt_capable()                   (smp_num_siblings > 1)
 142 #endif
 143
 144 #endif