Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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_ */ |