2 * Written by: Matthew Dobson, IBM Corporation
4 * Copyright (C) 2002, IBM Corp.
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.
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
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.
23 * Send feedback to <colpatch@us.ibm.com>
25 #ifndef _ASM_X86_TOPOLOGY_H
26 #define _ASM_X86_TOPOLOGY_H
29 #include <linux/cpumask.h>
30 #include <asm/mpspec.h>
32 /* Mappings between logical cpu number and node number */
33 extern int cpu_to_node_map
[];
34 extern cpumask_t node_to_cpumask_map
[];
36 /* Returns the number of the node containing CPU 'cpu' */
37 static inline int cpu_to_node(int cpu
)
39 return cpu_to_node_map
[cpu
];
43 * Returns the number of the node containing Node 'node'. This
44 * architecture is flat, so it is a pretty simple function!
46 #define parent_node(node) (node)
48 /* Returns a bitmask of CPUs on Node 'node'. */
49 static inline cpumask_t
node_to_cpumask(int node
)
51 return node_to_cpumask_map
[node
];
54 /* Returns the number of the first CPU on Node 'node'. */
55 static inline int node_to_first_cpu(int node
)
57 cpumask_t mask
= node_to_cpumask(node
);
59 return first_cpu(mask
);
62 #define pcibus_to_node(bus) __pcibus_to_node(bus)
63 #define pcibus_to_cpumask(bus) __pcibus_to_cpumask(bus)
65 /* sched_domains SD_NODE_INIT for NUMAQ machines */
66 #define SD_NODE_INIT (struct sched_domain) { \
67 .span = CPU_MASK_NONE, \
74 .imbalance_pct = 125, \
75 .cache_nice_tries = 1, \
80 .flags = SD_LOAD_BALANCE \
85 .last_balance = jiffies, \
86 .balance_interval = 1, \
87 .nr_balance_failed = 0, \
90 extern unsigned long node_start_pfn
[];
91 extern unsigned long node_end_pfn
[];
92 extern unsigned long node_remap_size
[];
94 #define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
96 #else /* CONFIG_NUMA */
98 #include <asm-generic/topology.h>
102 extern cpumask_t
cpu_coregroup_map(int cpu
);
105 #define topology_physical_package_id(cpu) (cpu_data(cpu).phys_proc_id)
106 #define topology_core_id(cpu) (cpu_data(cpu).cpu_core_id)
107 #define topology_core_siblings(cpu) (per_cpu(cpu_core_map, cpu))
108 #define topology_thread_siblings(cpu) (per_cpu(cpu_sibling_map, cpu))
112 #define mc_capable() (boot_cpu_data.x86_max_cores > 1)
113 #define smt_capable() (smp_num_siblings > 1)