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/list.h> 21 #include <linux/workqueue.h> 22 23 /** 24 * struct node_hmem_attrs - heterogeneous memory performance attributes 25 * 26 * @read_bandwidth: Read bandwidth in MB/s 27 * @write_bandwidth: Write bandwidth in MB/s 28 * @read_latency: Read latency in nanoseconds 29 * @write_latency: Write latency in nanoseconds 30 */ 31 struct node_hmem_attrs { 32 unsigned int read_bandwidth; 33 unsigned int write_bandwidth; 34 unsigned int read_latency; 35 unsigned int write_latency; 36 }; 37 38 enum cache_indexing { 39 NODE_CACHE_DIRECT_MAP, 40 NODE_CACHE_INDEXED, 41 NODE_CACHE_OTHER, 42 }; 43 44 enum cache_write_policy { 45 NODE_CACHE_WRITE_BACK, 46 NODE_CACHE_WRITE_THROUGH, 47 NODE_CACHE_WRITE_OTHER, 48 }; 49 50 /** 51 * struct node_cache_attrs - system memory caching attributes 52 * 53 * @indexing: The ways memory blocks may be placed in cache 54 * @write_policy: Write back or write through policy 55 * @size: Total size of cache in bytes 56 * @line_size: Number of bytes fetched on a cache miss 57 * @level: The cache hierarchy level 58 */ 59 struct node_cache_attrs { 60 enum cache_indexing indexing; 61 enum cache_write_policy write_policy; 62 u64 size; 63 u16 line_size; 64 u8 level; 65 }; 66 67 #ifdef CONFIG_HMEM_REPORTING 68 void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs); 69 void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs, 70 unsigned access); 71 #else 72 static inline void node_add_cache(unsigned int nid, 73 struct node_cache_attrs *cache_attrs) 74 { 75 } 76 77 static inline void node_set_perf_attrs(unsigned int nid, 78 struct node_hmem_attrs *hmem_attrs, 79 unsigned access) 80 { 81 } 82 #endif 83 84 struct node { 85 struct device dev; 86 struct list_head access_list; 87 88 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HUGETLBFS) 89 struct work_struct node_work; 90 #endif 91 #ifdef CONFIG_HMEM_REPORTING 92 struct list_head cache_attrs; 93 struct device *cache_dev; 94 #endif 95 }; 96 97 struct memory_block; 98 extern struct node *node_devices[]; 99 typedef void (*node_registration_func_t)(struct node *); 100 101 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_NUMA) 102 void link_mem_sections(int nid, unsigned long start_pfn, 103 unsigned long end_pfn, 104 enum meminit_context context); 105 #else 106 static inline void link_mem_sections(int nid, unsigned long start_pfn, 107 unsigned long end_pfn, 108 enum meminit_context context) 109 { 110 } 111 #endif 112 113 extern void unregister_node(struct node *node); 114 #ifdef CONFIG_NUMA 115 /* Core of the node registration - only memory hotplug should use this */ 116 extern int __register_one_node(int nid); 117 118 /* Registers an online node */ 119 static inline int register_one_node(int nid) 120 { 121 int error = 0; 122 123 if (node_online(nid)) { 124 struct pglist_data *pgdat = NODE_DATA(nid); 125 unsigned long start_pfn = pgdat->node_start_pfn; 126 unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; 127 128 error = __register_one_node(nid); 129 if (error) 130 return error; 131 /* link memory sections under this node */ 132 link_mem_sections(nid, start_pfn, end_pfn, MEMINIT_EARLY); 133 } 134 135 return error; 136 } 137 138 extern void unregister_one_node(int nid); 139 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid); 140 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid); 141 extern void unregister_memory_block_under_nodes(struct memory_block *mem_blk); 142 143 extern int register_memory_node_under_compute_node(unsigned int mem_nid, 144 unsigned int cpu_nid, 145 unsigned access); 146 147 #ifdef CONFIG_HUGETLBFS 148 extern void register_hugetlbfs_with_node(node_registration_func_t doregister, 149 node_registration_func_t unregister); 150 #endif 151 #else 152 static inline int __register_one_node(int nid) 153 { 154 return 0; 155 } 156 static inline int register_one_node(int nid) 157 { 158 return 0; 159 } 160 static inline int unregister_one_node(int nid) 161 { 162 return 0; 163 } 164 static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid) 165 { 166 return 0; 167 } 168 static inline int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 169 { 170 return 0; 171 } 172 static inline void unregister_memory_block_under_nodes(struct memory_block *mem_blk) 173 { 174 } 175 176 static inline void register_hugetlbfs_with_node(node_registration_func_t reg, 177 node_registration_func_t unreg) 178 { 179 } 180 #endif 181 182 #define to_node(device) container_of(device, struct node, dev) 183 184 #endif /* _LINUX_NODE_H_ */ 185