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_ */ 118