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