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 */
34 extern int cpu_to_node_map
[];
37 DECLARE_PER_CPU(int, x86_cpu_to_node_map
);
38 extern int x86_cpu_to_node_map_init
[];
39 extern void *x86_cpu_to_node_map_early_ptr
;
40 /* Returns the number of the current Node. */
41 #define numa_node_id() (early_cpu_to_node(raw_smp_processor_id()))
44 extern cpumask_t node_to_cpumask_map
[];
46 #define NUMA_NO_NODE (-1)
48 /* Returns the number of the node containing CPU 'cpu' */
50 #define early_cpu_to_node(cpu) cpu_to_node(cpu)
51 static inline int cpu_to_node(int cpu
)
53 return cpu_to_node_map
[cpu
];
56 #else /* CONFIG_X86_64 */
57 static inline int early_cpu_to_node(int cpu
)
59 int *cpu_to_node_map
= x86_cpu_to_node_map_early_ptr
;
62 return cpu_to_node_map
[cpu
];
63 else if (per_cpu_offset(cpu
))
64 return per_cpu(x86_cpu_to_node_map
, cpu
);
69 static inline int cpu_to_node(int cpu
)
71 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
72 if (x86_cpu_to_node_map_early_ptr
) {
73 printk("KERN_NOTICE cpu_to_node(%d): usage too early!\n",
76 return ((int *)x86_cpu_to_node_map_early_ptr
)[cpu
];
79 if (per_cpu_offset(cpu
))
80 return per_cpu(x86_cpu_to_node_map
, cpu
);
84 #endif /* CONFIG_X86_64 */
87 * Returns the number of the node containing Node 'node'. This
88 * architecture is flat, so it is a pretty simple function!
90 #define parent_node(node) (node)
92 /* Returns a bitmask of CPUs on Node 'node'. */
93 static inline cpumask_t
node_to_cpumask(int node
)
95 return node_to_cpumask_map
[node
];
98 /* Returns the number of the first CPU on Node 'node'. */
99 static inline int node_to_first_cpu(int node
)
101 cpumask_t mask
= node_to_cpumask(node
);
103 return first_cpu(mask
);
106 #define pcibus_to_node(bus) __pcibus_to_node(bus)
107 #define pcibus_to_cpumask(bus) __pcibus_to_cpumask(bus)
110 extern unsigned long node_start_pfn
[];
111 extern unsigned long node_end_pfn
[];
112 extern unsigned long node_remap_size
[];
113 #define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
115 # ifdef CONFIG_X86_HT
116 # define ENABLE_TOPO_DEFINES
119 # define SD_CACHE_NICE_TRIES 1
120 # define SD_IDLE_IDX 1
121 # define SD_NEWIDLE_IDX 2
122 # define SD_FORKEXEC_IDX 0
127 # define ENABLE_TOPO_DEFINES
130 # define SD_CACHE_NICE_TRIES 2
131 # define SD_IDLE_IDX 2
132 # define SD_NEWIDLE_IDX 0
133 # define SD_FORKEXEC_IDX 1
137 /* sched_domains SD_NODE_INIT for NUMAQ machines */
138 #define SD_NODE_INIT (struct sched_domain) { \
139 .span = CPU_MASK_NONE, \
144 .max_interval = 32, \
146 .imbalance_pct = 125, \
147 .cache_nice_tries = SD_CACHE_NICE_TRIES, \
149 .idle_idx = SD_IDLE_IDX, \
150 .newidle_idx = SD_NEWIDLE_IDX, \
152 .forkexec_idx = SD_FORKEXEC_IDX, \
153 .flags = SD_LOAD_BALANCE \
158 .last_balance = jiffies, \
159 .balance_interval = 1, \
160 .nr_balance_failed = 0, \
163 #ifdef CONFIG_X86_64_ACPI_NUMA
164 extern int __node_distance(int, int);
165 #define node_distance(a, b) __node_distance(a, b)
168 #else /* CONFIG_NUMA */
170 #include <asm-generic/topology.h>
174 extern cpumask_t
cpu_coregroup_map(int cpu
);
176 #ifdef ENABLE_TOPO_DEFINES
177 #define topology_physical_package_id(cpu) (cpu_data(cpu).phys_proc_id)
178 #define topology_core_id(cpu) (cpu_data(cpu).cpu_core_id)
179 #define topology_core_siblings(cpu) (per_cpu(cpu_core_map, cpu))
180 #define topology_thread_siblings(cpu) (per_cpu(cpu_sibling_map, cpu))
184 #define mc_capable() (boot_cpu_data.x86_max_cores > 1)
185 #define smt_capable() (smp_num_siblings > 1)