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