include/asm-i386/topology.h

   1 /*
   2  * linux/include/asm-i386/topology.h
   3  *
   4  * Written by: Matthew Dobson, IBM Corporation
   5  *
   6  * Copyright (C) 2002, IBM Corp.
   7  *
   8  * All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  18  * NON INFRINGEMENT.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Send feedback to <colpatch@us.ibm.com>
  26  */
  27 #ifndef _ASM_I386_TOPOLOGY_H
  28 #define _ASM_I386_TOPOLOGY_H
  29
  30 #ifdef CONFIG_NUMA
  31
  32 #include <asm/mpspec.h>
  33
  34 #include <linux/cpumask.h>
  35
  36 /* Mappings between logical cpu number and node number */
  37 extern cpumask_t node_2_cpu_mask[];
  38 extern int cpu_2_node[];
  39
  40 /* Returns the number of the node containing CPU 'cpu' */
  41 static inline int cpu_to_node(int cpu)
  42 {
  43         return cpu_2_node[cpu];
  44 }
  45
  46 /* Returns the number of the node containing Node 'node'.  This architecture is flat,
  47    so it is a pretty simple function! */
  48 #define parent_node(node) (node)
  49
  50 /* Returns a bitmask of CPUs on Node 'node'. */
  51 static inline cpumask_t node_to_cpumask(int node)
  52 {
  53         return node_2_cpu_mask[node];
  54 }
  55
  56 /* Returns the number of the first CPU on Node 'node'. */
  57 static inline int node_to_first_cpu(int node)
  58 {
  59         cpumask_t mask = node_to_cpumask(node);
  60         return first_cpu(mask);
  61 }
  62
  63 /* Returns the number of the node containing PCI bus number 'busnr' */
  64 static inline cpumask_t __pcibus_to_cpumask(int busnr)
  65 {
  66         return node_to_cpumask(mp_bus_id_to_node[busnr]);
  67 }
  68 #define pcibus_to_cpumask(bus)  __pcibus_to_cpumask(bus->number)
  69
  70 /* sched_domains SD_NODE_INIT for NUMAQ machines */
  71 #define SD_NODE_INIT (struct sched_domain) {            \
  72         .span                   = CPU_MASK_NONE,        \
  73         .parent                 = NULL,                 \
  74         .groups                 = NULL,                 \
  75         .min_interval           = 8,                    \
  76         .max_interval           = 32,                   \
  77         .busy_factor            = 32,                   \
  78         .imbalance_pct          = 125,                  \
  79         .cache_hot_time         = (10*1000000),         \
  80         .cache_nice_tries       = 1,                    \
  81         .per_cpu_gain           = 100,                  \
  82         .flags                  = SD_LOAD_BALANCE       \
  83                                 | SD_BALANCE_EXEC       \
  84                                 | SD_BALANCE_NEWIDLE    \
  85                                 | SD_WAKE_IDLE          \
  86                                 | SD_WAKE_BALANCE,      \
  87         .last_balance           = jiffies,              \
  88         .balance_interval       = 1,                    \
  89         .nr_balance_failed      = 0,                    \
  90 }
  91
  92 extern unsigned long node_start_pfn[];
  93 extern unsigned long node_end_pfn[];
  94 extern unsigned long node_remap_size[];
  95
  96 #define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
  97
  98 #else /* !CONFIG_NUMA */
  99 /*
 100  * Other i386 platforms should define their own version of the
 101  * above macros here.
 102  */
 103
 104 #include <asm-generic/topology.h>
 105
 106 #endif /* CONFIG_NUMA */
 107
 108 #endif /* _ASM_I386_TOPOLOGY_H */