include/linux/numa.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_NUMA_H
   3 #define _LINUX_NUMA_H
   4 #include <linux/init.h>
   5 #include <linux/types.h>
   6
   7 #ifdef CONFIG_NODES_SHIFT
   8 #define NODES_SHIFT     CONFIG_NODES_SHIFT
   9 #else
  10 #define NODES_SHIFT     0
  11 #endif
  12
  13 #define MAX_NUMNODES    (1 << NODES_SHIFT)
  14
  15 #define NUMA_NO_NODE    (-1)
  16 #define NUMA_NO_MEMBLK  (-1)
  17
  18 static inline bool numa_valid_node(int nid)
  19 {
  20         return nid >= 0 && nid < MAX_NUMNODES;
  21 }
  22
  23 /* optionally keep NUMA memory info available post init */
  24 #ifdef CONFIG_NUMA_KEEP_MEMINFO
  25 #define __initdata_or_meminfo
  26 #else
  27 #define __initdata_or_meminfo __initdata
  28 #endif
  29
  30 #ifdef CONFIG_NUMA
  31 #include <asm/sparsemem.h>
  32
  33 extern struct pglist_data *node_data[];
  34 #define NODE_DATA(nid)  (node_data[nid])
  35
  36 void __init alloc_node_data(int nid);
  37 void __init alloc_offline_node_data(int nid);
  38
  39 /* Generic implementation available */
  40 int numa_nearest_node(int node, unsigned int state);
  41
  42 #ifndef memory_add_physaddr_to_nid
  43 int memory_add_physaddr_to_nid(u64 start);
  44 #endif
  45
  46 #ifndef phys_to_target_node
  47 int phys_to_target_node(u64 start);
  48 #endif
  49
  50 int numa_fill_memblks(u64 start, u64 end);
  51
  52 #else /* !CONFIG_NUMA */
  53 static inline int numa_nearest_node(int node, unsigned int state)
  54 {
  55         return NUMA_NO_NODE;
  56 }
  57
  58 static inline int memory_add_physaddr_to_nid(u64 start)
  59 {
  60         return 0;
  61 }
  62 static inline int phys_to_target_node(u64 start)
  63 {
  64         return 0;
  65 }
  66
  67 static inline void alloc_offline_node_data(int nid) {}
  68 #endif
  69
  70 #define numa_map_to_online_node(node) numa_nearest_node(node, N_ONLINE)
  71
  72 #ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP
  73 extern const struct attribute_group arch_node_dev_group;
  74 #endif
  75
  76 #endif /* _LINUX_NUMA_H */