include/linux/node.h

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