arch/x86/include/asm/numa.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_NUMA_H
   3 #define _ASM_X86_NUMA_H
   4
   5 #include <linux/nodemask.h>
   6
   7 #include <asm/topology.h>
   8 #include <asm/apicdef.h>
   9
  10 #ifdef CONFIG_NUMA
  11
  12 #define NR_NODE_MEMBLKS         (MAX_NUMNODES*2)
  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 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 #endif
  58
  59 #ifdef CONFIG_NUMA
  60 extern void numa_set_node(int cpu, int node);
  61 extern void numa_clear_node(int cpu);
  62 extern void __init init_cpu_to_node(void);
  63 extern void numa_add_cpu(int cpu);
  64 extern void numa_remove_cpu(int cpu);
  65 #else   /* CONFIG_NUMA */
  66 static inline void numa_set_node(int cpu, int node)     { }
  67 static inline void numa_clear_node(int cpu)             { }
  68 static inline void init_cpu_to_node(void)               { }
  69 static inline void numa_add_cpu(int cpu)                { }
  70 static inline void numa_remove_cpu(int cpu)             { }
  71 #endif  /* CONFIG_NUMA */
  72
  73 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
  74 void debug_cpumask_set_cpu(int cpu, int node, bool enable);
  75 #endif
  76
  77 #ifdef CONFIG_NUMA_EMU
  78 #define FAKE_NODE_MIN_SIZE      ((u64)32 << 20)
  79 #define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1UL))
  80 void numa_emu_cmdline(char *);
  81 #endif /* CONFIG_NUMA_EMU */
  82
  83 #endif  /* _ASM_X86_NUMA_H */