LXR linux/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#include <linux/errno.h>
   7
   8#include <asm/topology.h>
   9#include <asm/apicdef.h>
  10
  11#ifdef CONFIG_NUMA
  12
  13#define NR_NODE_MEMBLKS         (MAX_NUMNODES*2)
  14
  15/*
  16 * Too small node sizes may confuse the VM badly. Usually they
  17 * result from BIOS bugs. So dont recognize nodes as standalone
  18 * NUMA entities that have less than this amount of RAM listed:
  19 */
  20#define NODE_MIN_SIZE (4*1024*1024)
  21
  22extern int numa_off;
  23
  24/*
  25 * __apicid_to_node[] stores the raw mapping between physical apicid and
  26 * node and is used to initialize cpu_to_node mapping.
  27 *
  28 * The mapping may be overridden by apic->numa_cpu_node() on 32bit and thus
  29 * should be accessed by the accessors - set_apicid_to_node() and
  30 * numa_cpu_node().
  31 */
  32extern s16 __apicid_to_node[MAX_LOCAL_APIC];
  33extern nodemask_t numa_nodes_parsed __initdata;
  34
  35extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
  36extern void __init numa_set_distance(int from, int to, int distance);
  37
  38static inline void set_apicid_to_node(int apicid, s16 node)
  39{
  40        __apicid_to_node[apicid] = node;
  41}
  42
  43extern int numa_cpu_node(int cpu);
  44
  45#else   /* CONFIG_NUMA */
  46static inline void set_apicid_to_node(int apicid, s16 node)
  47{
  48}
  49
  50static inline int numa_cpu_node(int cpu)
  51{
  52        return NUMA_NO_NODE;
  53}
  54#endif  /* CONFIG_NUMA */
  55
  56#ifdef CONFIG_X86_32
  57# include <asm/numa_32.h>
  58#endif
  59
  60#ifdef CONFIG_NUMA
  61extern void numa_set_node(int cpu, int node);
  62extern void numa_clear_node(int cpu);
  63extern void __init init_cpu_to_node(void);
  64extern void numa_add_cpu(int cpu);
  65extern void numa_remove_cpu(int cpu);
  66extern void init_gi_nodes(void);
  67#else   /* CONFIG_NUMA */
  68static inline void numa_set_node(int cpu, int node)     { }
  69static inline void numa_clear_node(int cpu)             { }
  70static inline void init_cpu_to_node(void)               { }
  71static inline void numa_add_cpu(int cpu)                { }
  72static inline void numa_remove_cpu(int cpu)             { }
  73static inline void init_gi_nodes(void)                  { }
  74#endif  /* CONFIG_NUMA */
  75
  76#ifdef CONFIG_DEBUG_PER_CPU_MAPS
  77void debug_cpumask_set_cpu(int cpu, int node, bool enable);
  78#endif
  79
  80#ifdef CONFIG_NUMA_EMU
  81#define FAKE_NODE_MIN_SIZE      ((u64)32 << 20)
  82#define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1UL))
  83int numa_emu_cmdline(char *str);
  84#else /* CONFIG_NUMA_EMU */
  85static inline int numa_emu_cmdline(char *str)
  86{
  87        return -EINVAL;
  88}
  89#endif /* CONFIG_NUMA_EMU */
  90
  91#endif  /* _ASM_X86_NUMA_H */
  92