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 #ifdef CONFIG_X86_32
  29 # ifdef CONFIG_X86_HT
  30 #  define ENABLE_TOPO_DEFINES
  31 # endif
  32 #else
  33 # ifdef CONFIG_SMP
  34 #  define ENABLE_TOPO_DEFINES
  35 # endif
  36 #endif
  37
  38 /* Node not present */
  39 #define NUMA_NO_NODE    (-1)
  40
  41 #ifdef CONFIG_NUMA
  42 #include <linux/cpumask.h>
  43 #include <asm/mpspec.h>
  44
  45 #ifdef CONFIG_X86_32
  46
  47 /* Mappings between node number and cpus on that node. */
  48 extern cpumask_t node_to_cpumask_map[];
  49
  50 /* Mappings between logical cpu number and node number */
  51 extern int cpu_to_node_map[];
  52
  53 /* Returns the number of the node containing CPU 'cpu' */
  54 static inline int cpu_to_node(int cpu)
  55 {
  56         return cpu_to_node_map[cpu];
  57 }
  58 #define early_cpu_to_node(cpu)  cpu_to_node(cpu)
  59
  60 /* Returns a bitmask of CPUs on Node 'node'.
  61  *
  62  * Side note: this function creates the returned cpumask on the stack
  63  * so with a high NR_CPUS count, excessive stack space is used.  The
  64  * cpumask_of_node function should be used whenever possible.
  65  */
  66 static inline cpumask_t node_to_cpumask(int node)
  67 {
  68         return node_to_cpumask_map[node];
  69 }
  70
  71 /* Returns a bitmask of CPUs on Node 'node'. */
  72 static inline const struct cpumask *cpumask_of_node(int node)
  73 {
  74         return &node_to_cpumask_map[node];
  75 }
  76
  77 static inline void setup_node_to_cpumask_map(void) { }
  78
  79 #else /* CONFIG_X86_64 */
  80
  81 /* Mappings between node number and cpus on that node. */
  82 extern cpumask_t *node_to_cpumask_map;
  83
  84 /* Mappings between logical cpu number and node number */
  85 DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
  86
  87 /* Returns the number of the current Node. */
  88 DECLARE_PER_CPU(int, node_number);
  89 #define numa_node_id()          percpu_read(node_number)
  90
  91 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  92 extern int cpu_to_node(int cpu);
  93 extern int early_cpu_to_node(int cpu);
  94 extern const cpumask_t *cpumask_of_node(int node);
  95 extern cpumask_t node_to_cpumask(int node);
  96
  97 #else   /* !CONFIG_DEBUG_PER_CPU_MAPS */
  98
  99 /* Returns the number of the node containing CPU 'cpu' */
 100 static inline int cpu_to_node(int cpu)
 101 {
 102         return per_cpu(x86_cpu_to_node_map, cpu);
 103 }
 104
 105 /* Same function but used if called before per_cpu areas are setup */
 106 static inline int early_cpu_to_node(int cpu)
 107 {
 108         return early_per_cpu(x86_cpu_to_node_map, cpu);
 109 }
 110
 111 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
 112 static inline const cpumask_t *cpumask_of_node(int node)
 113 {
 114         return &node_to_cpumask_map[node];
 115 }
 116
 117 /* Returns a bitmask of CPUs on Node 'node'. */
 118 static inline cpumask_t node_to_cpumask(int node)
 119 {
 120         return node_to_cpumask_map[node];
 121 }
 122
 123 #endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
 124
 125 extern void setup_node_to_cpumask_map(void);
 126
 127 /*
 128  * Replace default node_to_cpumask_ptr with optimized version
 129  * Deprecated: use "const struct cpumask *mask = cpumask_of_node(node)"
 130  */
 131 #define node_to_cpumask_ptr(v, node)            \
 132                 const cpumask_t *v = cpumask_of_node(node)
 133
 134 #define node_to_cpumask_ptr_next(v, node)       \
 135                            v = cpumask_of_node(node)
 136
 137 #endif /* CONFIG_X86_64 */
 138
 139 /*
 140  * Returns the number of the node containing Node 'node'. This
 141  * architecture is flat, so it is a pretty simple function!
 142  */
 143 #define parent_node(node) (node)
 144
 145 #define pcibus_to_node(bus) __pcibus_to_node(bus)
 146
 147 #ifdef CONFIG_X86_32
 148 extern unsigned long node_start_pfn[];
 149 extern unsigned long node_end_pfn[];
 150 extern unsigned long node_remap_size[];
 151 #define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
 152
 153 # define SD_CACHE_NICE_TRIES    1
 154 # define SD_IDLE_IDX            1
 155 # define SD_NEWIDLE_IDX         2
 156 # define SD_FORKEXEC_IDX        0
 157
 158 #else
 159
 160 # define SD_CACHE_NICE_TRIES    2
 161 # define SD_IDLE_IDX            2
 162 # define SD_NEWIDLE_IDX         2
 163 # define SD_FORKEXEC_IDX        1
 164
 165 #endif
 166
 167 /* sched_domains SD_NODE_INIT for NUMA machines */
 168 #define SD_NODE_INIT (struct sched_domain) {            \
 169         .min_interval           = 8,                    \
 170         .max_interval           = 32,                   \
 171         .busy_factor            = 32,                   \
 172         .imbalance_pct          = 125,                  \
 173         .cache_nice_tries       = SD_CACHE_NICE_TRIES,  \
 174         .busy_idx               = 3,                    \
 175         .idle_idx               = SD_IDLE_IDX,          \
 176         .newidle_idx            = SD_NEWIDLE_IDX,       \
 177         .wake_idx               = 1,                    \
 178         .forkexec_idx           = SD_FORKEXEC_IDX,      \
 179         .flags                  = SD_LOAD_BALANCE       \
 180                                 | SD_BALANCE_EXEC       \
 181                                 | SD_BALANCE_FORK       \
 182                                 | SD_WAKE_AFFINE        \
 183                                 | SD_WAKE_BALANCE       \
 184                                 | SD_SERIALIZE,         \
 185         .last_balance           = jiffies,              \
 186         .balance_interval       = 1,                    \
 187 }
 188
 189 #ifdef CONFIG_X86_64_ACPI_NUMA
 190 extern int __node_distance(int, int);
 191 #define node_distance(a, b) __node_distance(a, b)
 192 #endif
 193
 194 #else /* !CONFIG_NUMA */
 195
 196 static inline int numa_node_id(void)
 197 {
 198         return 0;
 199 }
 200
 201 static inline int cpu_to_node(int cpu)
 202 {
 203         return 0;
 204 }
 205
 206 static inline int early_cpu_to_node(int cpu)
 207 {
 208         return 0;
 209 }
 210
 211 static inline const cpumask_t *cpumask_of_node(int node)
 212 {
 213         return &cpu_online_map;
 214 }
 215 static inline cpumask_t node_to_cpumask(int node)
 216 {
 217         return cpu_online_map;
 218 }
 219 static inline int node_to_first_cpu(int node)
 220 {
 221         return first_cpu(cpu_online_map);
 222 }
 223
 224 static inline void setup_node_to_cpumask_map(void) { }
 225
 226 /*
 227  * Replace default node_to_cpumask_ptr with optimized version
 228  * Deprecated: use "const struct cpumask *mask = cpumask_of_node(node)"
 229  */
 230 #define node_to_cpumask_ptr(v, node)            \
 231                 const cpumask_t *v = cpumask_of_node(node)
 232
 233 #define node_to_cpumask_ptr_next(v, node)       \
 234                            v = cpumask_of_node(node)
 235 #endif
 236
 237 #include <asm-generic/topology.h>
 238
 239 #ifdef CONFIG_NUMA
 240 /* Returns the number of the first CPU on Node 'node'. */
 241 static inline int node_to_first_cpu(int node)
 242 {
 243         return cpumask_first(cpumask_of_node(node));
 244 }
 245 #endif
 246
 247 extern const struct cpumask *cpu_coregroup_mask(int cpu);
 248
 249 #ifdef ENABLE_TOPO_DEFINES
 250 #define topology_physical_package_id(cpu)       (cpu_data(cpu).phys_proc_id)
 251 #define topology_core_id(cpu)                   (cpu_data(cpu).cpu_core_id)
 252 #define topology_core_cpumask(cpu)              (per_cpu(cpu_core_map, cpu))
 253 #define topology_thread_cpumask(cpu)            (per_cpu(cpu_sibling_map, cpu))
 254
 255 /* indicates that pointers to the topology cpumask_t maps are valid */
 256 #define arch_provides_topology_pointers         yes
 257 #endif
 258
 259 static inline void arch_fix_phys_package_id(int num, u32 slot)
 260 {
 261 }
 262
 263 struct pci_bus;
 264 void set_pci_bus_resources_arch_default(struct pci_bus *b);
 265
 266 #ifdef CONFIG_SMP
 267 #define mc_capable()    (cpumask_weight(cpu_core_mask(0)) != nr_cpu_ids)
 268 #define smt_capable()                   (smp_num_siblings > 1)
 269 #endif
 270
 271 #ifdef CONFIG_NUMA
 272 extern int get_mp_bus_to_node(int busnum);
 273 extern void set_mp_bus_to_node(int busnum, int node);
 274 #else
 275 static inline int get_mp_bus_to_node(int busnum)
 276 {
 277         return 0;
 278 }
 279 static inline void set_mp_bus_to_node(int busnum, int node)
 280 {
 281 }
 282 #endif
 283
 284 #endif /* _ASM_X86_TOPOLOGY_H */