include/linux/node.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * include/linux/node.h - generic node definition
   4  *
   5  * This is mainly for topological representation. We define the
   6  * basic 'struct node' here, which can be embedded in per-arch
   7  * definitions of processors.
   8  *
   9  * Basic handling of the devices is done in drivers/base/node.c
  10  * and system devices are handled in drivers/base/sys.c.
  11  *
  12  * Nodes are exported via driverfs in the class/node/devices/
  13  * directory.
  14  */
  15 #ifndef _LINUX_NODE_H_
  16 #define _LINUX_NODE_H_
  17
  18 #include <linux/device.h>
  19 #include <linux/cpumask.h>
  20 #include <linux/workqueue.h>
  21
  22 struct node {
  23         struct device   dev;
  24
  25 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS)
  26         struct work_struct      node_work;
  27 #endif
  28 };
  29
  30 struct memory_block;
  31 extern struct node *node_devices[];
  32 typedef  void (*node_registration_func_t)(struct node *);
  33
  34 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA)
  35 extern int link_mem_sections(int nid, unsigned long start_pfn,
  36                              unsigned long end_pfn);
  37 #else
  38 static inline int link_mem_sections(int nid, unsigned long start_pfn,
  39                                     unsigned long end_pfn)
  40 {
  41         return 0;
  42 }
  43 #endif
  44
  45 extern void unregister_node(struct node *node);
  46 #ifdef CONFIG_NUMA
  47 /* Core of the node registration - only memory hotplug should use this */
  48 extern int __register_one_node(int nid);
  49
  50 /* Registers an online node */
  51 static inline int register_one_node(int nid)
  52 {
  53         int error = 0;
  54
  55         if (node_online(nid)) {
  56                 struct pglist_data *pgdat = NODE_DATA(nid);
  57                 unsigned long start_pfn = pgdat->node_start_pfn;
  58                 unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
  59
  60                 error = __register_one_node(nid);
  61                 if (error)
  62                         return error;
  63                 /* link memory sections under this node */
  64                 error = link_mem_sections(nid, start_pfn, end_pfn);
  65         }
  66
  67         return error;
  68 }
  69
  70 extern void unregister_one_node(int nid);
  71 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
  72 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
  73 extern int register_mem_sect_under_node(struct memory_block *mem_blk,
  74                                                 void *arg);
  75 extern int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
  76                                            unsigned long phys_index);
  77
  78 #ifdef CONFIG_HUGETLBFS
  79 extern void register_hugetlbfs_with_node(node_registration_func_t doregister,
  80                                          node_registration_func_t unregister);
  81 #endif
  82 #else
  83 static inline int __register_one_node(int nid)
  84 {
  85         return 0;
  86 }
  87 static inline int register_one_node(int nid)
  88 {
  89         return 0;
  90 }
  91 static inline int unregister_one_node(int nid)
  92 {
  93         return 0;
  94 }
  95 static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
  96 {
  97         return 0;
  98 }
  99 static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
 100 {
 101         return 0;
 102 }
 103 static inline int register_mem_sect_under_node(struct memory_block *mem_blk,
 104                                                         void *arg)
 105 {
 106         return 0;
 107 }
 108 static inline int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
 109                                                   unsigned long phys_index)
 110 {
 111         return 0;
 112 }
 113
 114 static inline void register_hugetlbfs_with_node(node_registration_func_t reg,
 115                                                 node_registration_func_t unreg)
 116 {
 117 }
 118 #endif
 119
 120 #define to_node(device) container_of(device, struct node, dev)
 121
 122 #endif /* _LINUX_NODE_H_ */