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 #ifdef CONFIG_X86_32
  34 extern int cpu_to_node_map[];
  35 #else
  36 /* Returns the number of the current Node. */
  37 #define numa_node_id()          (early_cpu_to_node(raw_smp_processor_id()))
  38 #endif
  39
  40 DECLARE_PER_CPU(int, x86_cpu_to_node_map);
  41
  42 #ifdef CONFIG_SMP
  43 extern int x86_cpu_to_node_map_init[];
  44 extern void *x86_cpu_to_node_map_early_ptr;
  45 #else
  46 #define x86_cpu_to_node_map_early_ptr NULL
  47 #endif
  48
  49 extern cpumask_t node_to_cpumask_map[];
  50
  51 #define NUMA_NO_NODE    (-1)
  52
  53 /* Returns the number of the node containing CPU 'cpu' */
  54 #ifdef CONFIG_X86_32
  55 #define early_cpu_to_node(cpu)  cpu_to_node(cpu)
  56 static inline int cpu_to_node(int cpu)
  57 {
  58         return cpu_to_node_map[cpu];
  59 }
  60
  61 #else /* CONFIG_X86_64 */
  62
  63 #ifdef CONFIG_SMP
  64 static inline int early_cpu_to_node(int cpu)
  65 {
  66         int *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;
  67
  68         if (cpu_to_node_map)
  69                 return cpu_to_node_map[cpu];
  70         else if (per_cpu_offset(cpu))
  71                 return per_cpu(x86_cpu_to_node_map, cpu);
  72         else
  73                 return NUMA_NO_NODE;
  74 }
  75 #else
  76 #define early_cpu_to_node(cpu)  cpu_to_node(cpu)
  77 #endif
  78
  79 static inline int cpu_to_node(int cpu)
  80 {
  81 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  82         if (x86_cpu_to_node_map_early_ptr) {
  83                 printk("KERN_NOTICE cpu_to_node(%d): usage too early!\n",
  84                        (int)cpu);
  85                 dump_stack();
  86                 return ((int *)x86_cpu_to_node_map_early_ptr)[cpu];
  87         }
  88 #endif
  89         return per_cpu(x86_cpu_to_node_map, cpu);
  90 }
  91
  92 #ifdef  CONFIG_NUMA
  93
  94 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
  95 #define node_to_cpumask_ptr(v, node)            \
  96                 cpumask_t *v = &(node_to_cpumask_map[node])
  97
  98 #define node_to_cpumask_ptr_next(v, node)       \
  99                            v = &(node_to_cpumask_map[node])
 100 #endif
 101
 102 #endif /* CONFIG_X86_64 */
 103
 104 /*
 105  * Returns the number of the node containing Node 'node'. This
 106  * architecture is flat, so it is a pretty simple function!
 107  */
 108 #define parent_node(node) (node)
 109
 110 /* Returns a bitmask of CPUs on Node 'node'. */
 111 static inline cpumask_t node_to_cpumask(int node)
 112 {
 113         return node_to_cpumask_map[node];
 114 }
 115
 116 /* Returns the number of the first CPU on Node 'node'. */
 117 static inline int node_to_first_cpu(int node)
 118 {
 119         cpumask_t mask = node_to_cpumask(node);
 120
 121         return first_cpu(mask);
 122 }
 123
 124 #define pcibus_to_node(bus) __pcibus_to_node(bus)
 125 #define pcibus_to_cpumask(bus) __pcibus_to_cpumask(bus)
 126
 127 #ifdef CONFIG_X86_32
 128 extern unsigned long node_start_pfn[];
 129 extern unsigned long node_end_pfn[];
 130 extern unsigned long node_remap_size[];
 131 #define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
 132
 133 # ifdef CONFIG_X86_HT
 134 #  define ENABLE_TOPO_DEFINES
 135 # endif
 136
 137 # define SD_CACHE_NICE_TRIES    1
 138 # define SD_IDLE_IDX            1
 139 # define SD_NEWIDLE_IDX         2
 140 # define SD_FORKEXEC_IDX        0
 141
 142 #else
 143
 144 # ifdef CONFIG_SMP
 145 #  define ENABLE_TOPO_DEFINES
 146 # endif
 147
 148 # define SD_CACHE_NICE_TRIES    2
 149 # define SD_IDLE_IDX            2
 150 # define SD_NEWIDLE_IDX         2
 151 # define SD_FORKEXEC_IDX        1
 152
 153 #endif
 154
 155 /* sched_domains SD_NODE_INIT for NUMAQ machines */
 156 #define SD_NODE_INIT (struct sched_domain) {            \
 157         .min_interval           = 8,                    \
 158         .max_interval           = 32,                   \
 159         .busy_factor            = 32,                   \
 160         .imbalance_pct          = 125,                  \
 161         .cache_nice_tries       = SD_CACHE_NICE_TRIES,  \
 162         .busy_idx               = 3,                    \
 163         .idle_idx               = SD_IDLE_IDX,          \
 164         .newidle_idx            = SD_NEWIDLE_IDX,       \
 165         .wake_idx               = 1,                    \
 166         .forkexec_idx           = SD_FORKEXEC_IDX,      \
 167         .flags                  = SD_LOAD_BALANCE       \
 168                                 | SD_BALANCE_EXEC       \
 169                                 | SD_BALANCE_FORK       \
 170                                 | SD_SERIALIZE          \
 171                                 | SD_WAKE_BALANCE,      \
 172         .last_balance           = jiffies,              \
 173         .balance_interval       = 1,                    \
 174 }
 175
 176 #ifdef CONFIG_X86_64_ACPI_NUMA
 177 extern int __node_distance(int, int);
 178 #define node_distance(a, b) __node_distance(a, b)
 179 #endif
 180
 181 #else /* CONFIG_NUMA */
 182
 183 #endif
 184
 185 #include <asm-generic/topology.h>
 186
 187 extern cpumask_t cpu_coregroup_map(int cpu);
 188
 189 #ifdef ENABLE_TOPO_DEFINES
 190 #define topology_physical_package_id(cpu)       (cpu_data(cpu).phys_proc_id)
 191 #define topology_core_id(cpu)                   (cpu_data(cpu).cpu_core_id)
 192 #define topology_core_siblings(cpu)             (per_cpu(cpu_core_map, cpu))
 193 #define topology_thread_siblings(cpu)           (per_cpu(cpu_sibling_map, cpu))
 194 #endif
 195
 196 #ifdef CONFIG_SMP
 197 #define mc_capable()                    (boot_cpu_data.x86_max_cores > 1)
 198 #define smt_capable()                   (smp_num_siblings > 1)
 199 #endif
 200
 201 #endif