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 u8 cpu_to_node_map[];
  35
  36 #else
  37 DECLARE_PER_CPU(u16, x86_cpu_to_node_map);
  38 extern u16 x86_cpu_to_node_map_init[];
  39 extern void *x86_cpu_to_node_map_early_ptr;
  40 #endif
  41
  42 extern cpumask_t node_to_cpumask_map[];
  43
  44 #define NUMA_NO_NODE    ((u16)(~0))
  45
  46 /* Returns the number of the node containing CPU 'cpu' */
  47 #ifdef CONFIG_X86_32
  48 #define early_cpu_to_node(cpu)  cpu_to_node(cpu)
  49 static inline int cpu_to_node(int cpu)
  50 {
  51         return cpu_to_node_map[cpu];
  52 }
  53
  54 #else /* CONFIG_X86_64 */
  55 static inline int early_cpu_to_node(int cpu)
  56 {
  57         u16 *cpu_to_node_map = x86_cpu_to_node_map_early_ptr;
  58
  59         if (cpu_to_node_map)
  60                 return cpu_to_node_map[cpu];
  61         else if (per_cpu_offset(cpu))
  62                 return per_cpu(x86_cpu_to_node_map, cpu);
  63         else
  64                 return NUMA_NO_NODE;
  65 }
  66
  67 static inline int cpu_to_node(int cpu)
  68 {
  69 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  70         if (x86_cpu_to_node_map_early_ptr) {
  71                 printk("KERN_NOTICE cpu_to_node(%d): usage too early!\n",
  72                         (int)cpu);
  73                 dump_stack();
  74                 return ((int *)x86_cpu_to_node_map_early_ptr)[cpu];
  75         }
  76 #endif
  77         if (per_cpu_offset(cpu))
  78                 return per_cpu(x86_cpu_to_node_map, cpu);
  79         else
  80                 return NUMA_NO_NODE;
  81 }
  82 #endif /* CONFIG_X86_64 */
  83
  84 /*
  85  * Returns the number of the node containing Node 'node'. This
  86  * architecture is flat, so it is a pretty simple function!
  87  */
  88 #define parent_node(node) (node)
  89
  90 /* Returns a bitmask of CPUs on Node 'node'. */
  91 static inline cpumask_t node_to_cpumask(int node)
  92 {
  93         return node_to_cpumask_map[node];
  94 }
  95
  96 /* Returns the number of the first CPU on Node 'node'. */
  97 static inline int node_to_first_cpu(int node)
  98 {
  99         cpumask_t mask = node_to_cpumask(node);
 100
 101         return first_cpu(mask);
 102 }
 103
 104 #define pcibus_to_node(bus) __pcibus_to_node(bus)
 105 #define pcibus_to_cpumask(bus) __pcibus_to_cpumask(bus)
 106
 107 #ifdef CONFIG_X86_32
 108 extern unsigned long node_start_pfn[];
 109 extern unsigned long node_end_pfn[];
 110 extern unsigned long node_remap_size[];
 111 #define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
 112
 113 # ifdef CONFIG_X86_HT
 114 #  define ENABLE_TOPO_DEFINES
 115 # endif
 116
 117 # define SD_CACHE_NICE_TRIES    1
 118 # define SD_IDLE_IDX            1
 119 # define SD_NEWIDLE_IDX         2
 120 # define SD_FORKEXEC_IDX        0
 121
 122 #else
 123
 124 # ifdef CONFIG_SMP
 125 #  define ENABLE_TOPO_DEFINES
 126 # endif
 127
 128 # define SD_CACHE_NICE_TRIES    2
 129 # define SD_IDLE_IDX            2
 130 # define SD_NEWIDLE_IDX         0
 131 # define SD_FORKEXEC_IDX        1
 132
 133 #endif
 134
 135 /* sched_domains SD_NODE_INIT for NUMAQ machines */
 136 #define SD_NODE_INIT (struct sched_domain) {            \
 137         .span                   = CPU_MASK_NONE,        \
 138         .parent                 = NULL,                 \
 139         .child                  = NULL,                 \
 140         .groups                 = NULL,                 \
 141         .min_interval           = 8,                    \
 142         .max_interval           = 32,                   \
 143         .busy_factor            = 32,                   \
 144         .imbalance_pct          = 125,                  \
 145         .cache_nice_tries       = SD_CACHE_NICE_TRIES,  \
 146         .busy_idx               = 3,                    \
 147         .idle_idx               = SD_IDLE_IDX,          \
 148         .newidle_idx            = SD_NEWIDLE_IDX,       \
 149         .wake_idx               = 1,                    \
 150         .forkexec_idx           = SD_FORKEXEC_IDX,      \
 151         .flags                  = SD_LOAD_BALANCE       \
 152                                 | SD_BALANCE_EXEC       \
 153                                 | SD_BALANCE_FORK       \
 154                                 | SD_SERIALIZE          \
 155                                 | SD_WAKE_BALANCE,      \
 156         .last_balance           = jiffies,              \
 157         .balance_interval       = 1,                    \
 158         .nr_balance_failed      = 0,                    \
 159 }
 160
 161 #ifdef CONFIG_X86_64_ACPI_NUMA
 162 extern int __node_distance(int, int);
 163 #define node_distance(a, b) __node_distance(a, b)
 164 #endif
 165
 166 #else /* CONFIG_NUMA */
 167
 168 #include <asm-generic/topology.h>
 169
 170 #endif
 171
 172 extern cpumask_t cpu_coregroup_map(int cpu);
 173
 174 #ifdef ENABLE_TOPO_DEFINES
 175 #define topology_physical_package_id(cpu)       (cpu_data(cpu).phys_proc_id)
 176 #define topology_core_id(cpu)                   (cpu_data(cpu).cpu_core_id)
 177 #define topology_core_siblings(cpu)             (per_cpu(cpu_core_map, cpu))
 178 #define topology_thread_siblings(cpu)           (per_cpu(cpu_sibling_map, cpu))
 179 #endif
 180
 181 #ifdef CONFIG_SMP
 182 #define mc_capable()                    (boot_cpu_data.x86_max_cores > 1)
 183 #define smt_capable()                   (smp_num_siblings > 1)
 184 #endif
 185
 186 #endif