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numa.h
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1 #ifndef _ASM_X86_NUMA_H
2 #define _ASM_X86_NUMA_H
3 
4 #include <linux/nodemask.h>
5 
6 #include <asm/topology.h>
7 #include <asm/apicdef.h>
8 
9 #ifdef CONFIG_NUMA
10 
11 #define NR_NODE_MEMBLKS (MAX_NUMNODES*2)
12 #define ZONE_ALIGN (1UL << (MAX_ORDER+PAGE_SHIFT))
13 
14 /*
15  * Too small node sizes may confuse the VM badly. Usually they
16  * result from BIOS bugs. So dont recognize nodes as standalone
17  * NUMA entities that have less than this amount of RAM listed:
18  */
19 #define NODE_MIN_SIZE (4*1024*1024)
20 
21 extern int numa_off;
22 
23 /*
24  * __apicid_to_node[] stores the raw mapping between physical apicid and
25  * node and is used to initialize cpu_to_node mapping.
26  *
27  * The mapping may be overridden by apic->numa_cpu_node() on 32bit and thus
28  * should be accessed by the accessors - set_apicid_to_node() and
29  * numa_cpu_node().
30  */
31 extern s16 __apicid_to_node[MAX_LOCAL_APIC];
32 extern nodemask_t numa_nodes_parsed __initdata;
33 
34 extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
35 extern void __init numa_set_distance(int from, int to, int distance);
36 
37 static inline void set_apicid_to_node(int apicid, s16 node)
38 {
39  __apicid_to_node[apicid] = node;
40 }
41 
42 extern int __cpuinit numa_cpu_node(int cpu);
43 
44 #else /* CONFIG_NUMA */
45 static inline void set_apicid_to_node(int apicid, s16 node)
46 {
47 }
48 
49 static inline int numa_cpu_node(int cpu)
50 {
51  return NUMA_NO_NODE;
52 }
53 #endif /* CONFIG_NUMA */
54 
55 #ifdef CONFIG_X86_32
56 # include <asm/numa_32.h>
57 #else
58 # include <asm/numa_64.h>
59 #endif
60 
61 #ifdef CONFIG_NUMA
62 extern void __cpuinit numa_set_node(int cpu, int node);
63 extern void __cpuinit numa_clear_node(int cpu);
64 extern void __init init_cpu_to_node(void);
65 extern void __cpuinit numa_add_cpu(int cpu);
66 extern void __cpuinit numa_remove_cpu(int cpu);
67 #else /* CONFIG_NUMA */
68 static inline void numa_set_node(int cpu, int node) { }
69 static inline void numa_clear_node(int cpu) { }
70 static inline void init_cpu_to_node(void) { }
71 static inline void numa_add_cpu(int cpu) { }
72 static inline void numa_remove_cpu(int cpu) { }
73 #endif /* CONFIG_NUMA */
74 
75 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
76 void debug_cpumask_set_cpu(int cpu, int node, bool enable);
77 #endif
78 
79 #ifdef CONFIG_NUMA_EMU
80 #define FAKE_NODE_MIN_SIZE ((u64)32 << 20)
81 #define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1UL))
82 void numa_emu_cmdline(char *);
83 #endif /* CONFIG_NUMA_EMU */
84 
85 #endif /* _ASM_X86_NUMA_H */